JP2016137476A - Manufacturing method of ceramic filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abrasion of a grinding member such as a grindstone, in a process of grinding a honeycomb structure, when manufacturing a ceramic filter.SOLUTION: A honeycomb structure for providing a sealing port part in a first end part 120a and a second end part 120b in the lengthwise direction, is rotatingly driven around the first axis L1, and the honeycomb structure is ground by moving a first rotary grindstone 20 or a second rotary grindstone 10 capable of controlling a distance from the first axis L1 in the direction toward the second end part 120b from the first end part 120a of the honeycomb structure, and the first rotary grindstone 20 includes a preliminary grinding process of grinding a hard part harder than the second rotary grindstone 10 and including the first end part 120a and the second end part 120b of the honeycomb structure by using the first rotary grindstone 20 and a regular grinding process of grinding the honeycomb structure by using the second rotary grindstone 10.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a ceramic filter.

  Recently, particulates such as soot contained in exhaust gas exhausted from internal combustion engines such as buses, trucks, passenger cars, etc. and construction machinery, etc. (hereinafter also referred to as PM) have been harmful to the surrounding environment and human body. It is a problem. Therefore, various ceramic filters made of porous ceramics have been proposed as filters for collecting PM in exhaust gas and purifying exhaust gas.

  Examples of such a ceramic filter include a honeycomb structure in which a plurality of porous ceramic members in which a honeycomb-shaped flow path is formed and a ceramic molded body obtained by extruding a porous ceramic material. Here, a honeycomb structure formed of a plurality of divided members may be referred to as a divided filter, and a ceramic molded body formed integrally by molding may be referred to as an integrated filter.

  In the porous ceramic member constituting the honeycomb structure, usually, a large number of through holes are arranged in parallel in one direction, and the partition walls separating the through holes function as a filter. That is, the through-hole formed in the porous ceramic member forms a sealing portion in which either the inlet side or the outlet side end of the exhaust gas is sealed with a filler, and the exhaust gas flowing into one through-hole The gas always passes through the partition walls separating the through holes, and then flows out from the other through holes. When exhaust gas passes through these partition walls, the particulates are captured by the partition walls and the exhaust gas is purified. Is done.

  Conventionally, such a honeycomb structure functioning as a ceramic filter is formed by binding a plurality of porous ceramic members through an adhesive layer to form a honeycomb aggregate, and grinding the honeycomb aggregate into a predetermined shape to form a ceramic block. And manufacturing by providing a seal body on the outer peripheral surface thereof.

  On the other hand, a ceramic molded body that functions as such a ceramic filter is formed by extruding a porous ceramic material into a predetermined shape to form a ceramic molded body, and grinding this ceramic molded body into a predetermined shape as necessary. Thus, the ceramic block is manufactured by providing a sealing body on the outer peripheral surface as necessary.

  The shape of the ceramic filter is a ring shape in which the outer periphery of the substantially central portion of the substantially cylindrical ceramic filter is surrounded by a ring shape over the entire circumference, and both ends are tapered in the longitudinal direction. What has a convex part is provided.

  The ceramic filter having such a shape is obtained by grinding a part on the first end portion side of the outer peripheral surface of a substantially prismatic honeycomb aggregate or a ceramic molded body having a predetermined shape and a substantially cylindrical shape. A first tapered region of a ring-shaped convex portion connected to the grinding region and the first grinding region is formed, and then a part of the outer peripheral surface on the second end side is ground to form a cylindrical second grinding The second taper region of the ring-shaped convex portion connected to the region and the second grinding region is formed, and finally the top of the ring-shaped convex portion is ground to form the central grinding region ( (See Patent Document 1).

JP 2014-65104 A

  However, in the honeycomb aggregate, the first and second end portions each have a sealing portion that seals either the inlet or the outlet of the through hole of the porous ceramic member constituting the honeycomb aggregate with a filler. Therefore, it was harder than the other parts, and the wear generated on the grinding member such as a grindstone by grinding the first and second end portions was large. Further, in the ceramic molded body, the vicinity of the surface tended to be harder than the deep part, and similarly, the abrasion generated in the grinding member due to the grinding of the first and second end portions was large.

  The present invention is proposed in view of the above-described circumstances, and reduces the wear of the grinding member in the step of grinding the ceramic porous body when manufacturing the ceramic filter having the ring-shaped convex portion. It is an object to provide a method for manufacturing a ceramic filter.

  In order to solve the above-described problem, a method for producing a ceramic filter according to the present invention includes a first porous ceramic body that extends in a longitudinal direction of a ceramic porous body capable of collecting particulates by a porous ceramic material. A direction from the first end portion to the second end portion in the longitudinal direction using the first or second grinding means that can be driven to rotate around the axis and control the distance from the first axis. The ceramic porous body is ground for a predetermined distance respectively, and the first grinding means is a method of manufacturing a ceramic filter harder than the second grinding means, and the first grinding means is used to produce the ceramic filter. A pre-grinding step of grinding the portion including the first and second end portions of the ceramic porous body, and a main grinding step of grinding the ceramic porous body using the second grinding means. That.

  In the method for manufacturing a ceramic filter of the present invention, a portion of the honeycomb structure including the first and second end portions that is harder than the other portions in the pre-grinding step is ground by the first grinding means that is harder than the second grinding means. Then, since the honeycomb structure is ground by the second grinding means in the main grinding step, the wear of the second grinding means can be reduced.

  In the method for manufacturing a ceramic filter according to the present invention, the ceramic porous body includes a plurality of prismatic porous ceramic members each having a plurality of through holes arranged in parallel in the longitudinal direction with a partition wall interposed therebetween, and is bonded through a bonding layer. The honeycomb structure is preferably provided with sealing portions at the first and second end portions in the longitudinal direction. By making the ceramic porous body into a honeycomb structure, a ceramic filter having a large flow rate and excellent heat resistance can be provided.

  In the method for producing a ceramic filter of the present invention, the ceramic porous body is preferably a ceramic molded body formed by extruding a porous ceramic material into a predetermined shape. By making the ceramic porous body into a ceramic molded body, the number of manufacturing steps can be reduced and the manufacturing cost can be reduced.

  In the method for manufacturing a ceramic filter according to the present invention, the preliminary grinding step includes a first ground diameter that spans a first preliminary grinding distance in a direction from the first end toward the second end. A first pre-grinding step for forming a pre-grinding region, and a second pre-grinding diameter over a second pre-grinding distance in a direction from the second end toward the first end. And a second preliminary grinding step for forming the preliminary grinding region. In the first and second preliminary grinding steps, the portion including the hard first and second end portions is pre-ground by the first grinding means harder than the second grinding means, so that the second grinding in the main grinding step is performed. Wear of the means can be reduced.

  In the method for manufacturing a ceramic filter according to the present invention, the main grinding step includes a first diameter having a first diameter over a first distance in a direction from the first end portion toward the second end portion. Following the first main grinding step for forming the grinding region and the first main grinding step, a second larger than the first diameter over a second distance in a direction toward the second end. A second main grinding step for forming a central grinding region having a diameter of λ, and a third distance in a direction from the second end portion toward the first end portion. It is preferable to include a third main grinding step for forming the second grinding region.

  In the method for manufacturing a ceramic filter according to the present invention, the central grinding region is formed after the first grinding region is formed and before the second grinding region is formed. Therefore, the top of the ring-shaped convex portion of the honeycomb structure is formed. Mechanical strength can be ensured in the formation of the central grinding region corresponding to this grinding, and damage to the ring-shaped convex portion can be reduced.

  In the method for manufacturing a ceramic filter of the present invention, the first grinding means is driven to rotate around a second axis that is parallel to the first axis and capable of controlling a distance from the first axis. Preferably, the first rotating grindstone is rotationally symmetric about the second axis, and includes an outer peripheral portion having a predetermined diameter. By using the first rotating grindstone as the first grinding means, the portion including the first and second end portions of the honeycomb structure can be ground quickly and accurately.

  In the method for manufacturing a ceramic filter of the present invention, the second grinding means is driven to rotate around a third axis that is parallel to the first axis and that can control the distance from the first axis. A second rotating grindstone that is rotationally symmetric about the third axis, and an outer peripheral portion having a predetermined diameter, and a first diameter that decreases from the outer peripheral portion toward the first end side. It is preferable that a taper part and a 2nd taper part from which a diameter becomes small as it goes to the said 2nd edge part side from the said outer peripheral part are included.

  In the method for manufacturing a ceramic filter of the present invention, the honeycomb structure can be ground quickly and accurately by using the second rotating grindstone as the second grinding means. In addition, by providing the outer peripheral portion, the first tapered portion, and the second tapered portion, it is possible to appropriately use different portions according to the grinding region of the honeycomb structure and form an appropriate shape.

  In the method for producing a ceramic filter of the present invention, in the first main grinding step, the first grinding region is formed on the outer peripheral portion of the second rotary grindstone, and the second of the second rotary grindstone. A first taper region connected from the first grinding region to the central grinding region is formed by the taper portion, and in the third main grinding step, the first taper region is formed at the outer peripheral portion of the second rotating grindstone. It is preferable that a second tapered region connected from the second ground region to the central ground region is formed at the first tapered portion of the rotating grindstone.

  In the method for producing a ceramic filter of the present invention, the first tapered portion and the second tapered portion of the second rotating grindstone simultaneously form the second grinding region and the first grinding region, and simultaneously form the ring-shaped convex portion. By forming the second tapered region and the first tapered region, respectively, the number of steps for separately forming the first tapered region and the second tapered region can be reduced, and the first tapered region and the second tapered region can be reduced. The taper region can be formed accurately.

  In the method for manufacturing a ceramic filter according to the present invention, the main grinding step includes a first diameter having a first diameter over a first distance in a direction from the first end portion toward the second end portion. A first main grinding step for forming a grinding region; and a second grinding region having the first diameter over a third distance in a direction from the second end toward the first end. Following the fourth main grinding step and the fourth main grinding step, the second diameter larger than the first diameter over a second distance in the direction toward the first end. And a fifth grinding step for forming a central grinding region having

  In the method for manufacturing a ceramic filter according to the present invention, since the central grinding region is formed after the first and second grinding regions are formed, the first and second grinding regions and the central grinding region are ground quickly and accurately. Will be able to.

  In the method for manufacturing a ceramic filter of the present invention, the first grinding means is driven to rotate around a second axis that is parallel to the first axis and capable of controlling a distance from the first axis. Preferably, the first rotating grindstone is rotationally symmetric about the second axis, and includes an outer peripheral portion having a predetermined diameter. By using the first rotating grindstone as the first grinding means, the portion including the first and second end portions of the honeycomb structure can be ground quickly and accurately.

  In the method for manufacturing a ceramic filter of the present invention, the second grinding means is driven to rotate around a third axis that is parallel to the first axis and that can control the distance from the first axis. A second rotating grindstone that is rotationally symmetric about the third axis, and an outer peripheral portion having a predetermined diameter, and a first diameter that decreases from the outer peripheral portion toward the first end side. It is preferable that a taper part and a 2nd taper part from which a diameter becomes small as it goes to the said 2nd edge part side from the said outer peripheral part are included.

  In the method for manufacturing a ceramic filter of the present invention, the honeycomb structure can be ground quickly and accurately by using the second rotating grindstone as the second grinding means. In addition, by providing the outer peripheral portion, the first tapered portion, and the second tapered portion, it is possible to appropriately use different portions according to the grinding region of the honeycomb structure and form an appropriate shape.

  In the method for producing a ceramic filter of the present invention, in the first main grinding step, the first grinding region is formed on the outer peripheral portion of the second rotary grindstone, and the second of the second rotary grindstone. A first tapered region connected from the first grinding region to the central grinding region is formed by the tapered portion, and in the fourth main grinding step, the first tapered region is formed at the outer peripheral portion of the second rotating grindstone. It is preferable that a second tapered region connected to the central grinding region from the second grinding region is formed at the first tapered portion of the second rotating grindstone.

  In the method for producing a ceramic filter of the present invention, the first tapered portion and the second tapered portion of the second rotating grindstone simultaneously form the second grinding region and the first grinding region, and simultaneously form the ring-shaped convex portion. By forming the second tapered region and the first tapered region, respectively, the number of steps for separately forming the first tapered region and the second tapered region can be reduced, and the first tapered region and the second tapered region can be reduced. The taper region can be formed accurately.

  According to the present invention, when manufacturing a ceramic filter having a ring-shaped convex portion, it is possible to reduce wear of the grinding member in the process of grinding the ceramic porous body, and thus simplify the manufacturing process and reduce the manufacturing cost. Reduction can be achieved.

Fig. 1 (a) is a perspective view schematically showing an example of a honeycomb fired body constituting the honeycomb structure, and Fig. 1 (b) is a sectional view taken along the line BB. Fig.2 (a) is a perspective view which shows typically an example of a honeycomb aggregate | assembly, FIG.2 (b) is a side view of the honeycomb aggregate | assembly shown to Fig.2 (a). FIG. 3 (a) is a perspective view schematically showing an example of a pre-ground honeycomb aggregate, and FIG. 1 (b) is a side view of the pre-ground honeycomb aggregate shown in FIG. 3 (a). is there. 4 (a) and 4 (b) are diagrams showing a series of preliminary grinding steps for pregrinding the honeycomb aggregate. Fig.5 (a) is a perspective view which shows typically an example of a ceramic block, FIG.5 (b) is a side view of the ceramic block shown to Fig.5 (a). 6 (a), 6 (b) and 6 (c) are diagrams showing a series of main grinding steps in which a preliminarily ground honeycomb aggregate is ground to form a ceramic block. Fig.7 (a) is a perspective view which shows typically an example of a honeycomb structure, FIG.7 (b) is a side view of the honeycomb structure shown to Fig.7 (a). 8 (a), 8 (b) and 8 (c) are diagrams showing a series of other main grinding steps in which a pre-ground honeycomb aggregate is ground to form a ceramic block as a first modification. It is. 9 (a), 9 (b), 9 (c), and 9 (d) are diagrams illustrating a series of steps for manufacturing a ceramic filter formed of a ceramic molded body as a second modification. is there.

  Hereafter, the manufacturing method of the ceramic filter of this invention is demonstrated concretely. However, the present invention is not limited to the following configurations, and can be applied with appropriate modifications without departing from the scope of the present invention. Note that the present invention also includes a combination of two or more desirable configurations of the present invention described below.

  In the present embodiment, the ceramic porous body that collects particulates (PM) is formed of a honeycomb structure. Hereinafter, the ceramic filter constituted by the honeycomb structure is simply referred to as a honeycomb structure unless otherwise specified.

  A honeycomb fired body which is a porous ceramic member serving as a basic structure constituting the honeycomb structure will be described. Fig.1 (a) is a perspective view which shows typically an example of the honeycomb fired body which comprises a honeycomb structure, and FIG.1 (b) is the BB sectional drawing.

  A honeycomb fired body 110 shown in FIG. 1 (a) has a substantially prismatic shape, and a large number of through holes 111 are arranged in parallel in the longitudinal direction (direction b in FIG. 1 (a)) with a cell wall 113 therebetween. In addition, a cell in which any end portion of the through hole 111 is sealed with the sealing material 112 is formed. Therefore, the exhaust gas G that has flowed into the cell (through hole 111) having one end face opened always passes through the cell wall 113 separating the cell (through hole 111), and then the other end face (through hole having the other end face opened). 111). Therefore, the cell wall 113 functions as a filter for collecting PM and the like.

  Using such a honeycomb fired body 110, the honeycomb aggregate 120 is configured by binding 16 honeycomb fired bodies 110 in a total of 4 rows in the longitudinal direction and 4 rows in the lateral direction in the longitudinal direction. Fig. 2 (a) is a perspective view schematically showing an example of the honeycomb aggregate, and Fig. 2 (b) is a side view of the honeycomb aggregate shown in Fig. 2 (a).

  A honeycomb aggregate 120 shown in FIG. 2A has a prismatic structure in which 16 honeycomb fired bodies 110 are bundled through an adhesive layer 121. In the drawing, a first rotation axis L1 extending through the first end portion 120a and the second end portion 120b of the honeycomb aggregate 120 is drawn along the longitudinal direction.

  The honeycomb aggregate 120 is rotated around the first rotation axis L1, and first, a hard portion including the first end 120a and the second end 120b in the outer peripheral surface of the honeycomb aggregate 120 is hardened. The pre-grinding with the first rotating grindstone is performed, and then the outer peripheral surface of the honeycomb aggregate 120 is subjected to main grinding (main grinding) with the second rotating grindstone that is not harder than the first rotating grindstone, thereby obtaining a substantially cylindrical ceramic Create a block. The through holes 111 and the sealing material 112 of the honeycomb fired body 110 are exposed on the surface ground by the preliminary grinding or the main grinding. For this reason, the outer peripheral surfaces of the honeycomb aggregate and the ceramic block that have been pre-ground or main ground actually have irregularities, but the outer peripheral surface in the present specification is a solid having a smooth side surface. It is defined as the surface when viewed.

  FIG. 3 (a) is a perspective view schematically showing an example of a pre-ground honeycomb aggregate, and FIG. 3 (b) is a side view of the pre-ground honeycomb aggregate shown in FIG. 3 (a). is there. In the pre-ground honeycomb aggregate 140 shown in FIG. 3A, the side surface of the honeycomb aggregate 140 is defined as the outer peripheral surface 141 of the ceramic block. On the outer peripheral surface 141, regions corresponding to a first tapered region 136, a second tapered region 137, and a central grinding region 138 constituting a ring-shaped convex portion 135 described later are first regions in the ring-shaped convex portion forming region 145. Are shown as a tapered region forming region 146, a second tapered region forming region 147, and a central ground region forming region 148.

  In the preliminarily ground honeycomb aggregate 140 shown in FIG. 3A, a first pregrinding region 144 having a pregrinding diameter in the direction from the first end 140a to the second end 140b is formed. ing. The first preliminary grinding region 144 is formed over a first preliminary grinding distance that does not reach the first taper region formation region 146 from the first end portion 140a, but the first taper region formation is performed. The region may reach 146.

  Further, in the preliminarily ground honeycomb aggregate 140, a second pregrinding region 149 having a pregrind diameter is formed in the direction from the second end 140b toward the first end 140a. The second preliminary grinding region 149 is formed over a second preliminary grinding distance that does not reach the second tapered region formation region 147 from the second end portion 140b. 147 may be reached.

  Here, the pre-ground diameter is preferably 100 to 200 mm, more preferably 120 to 170 mm, and particularly preferably 130 to 160 mm. If it is larger than 200 mm, the portion including the first end portion 140a and the second end portion 140b is ground with the second rotating grindstone that is not harder than the first rotating grindstone, and wear of the second rotating grindstone is caused. growing. If it is smaller than 100 mm, a processing mark formed by the first rotating grindstone may remain and a sufficiently smooth surface may not be formed.

  The first preliminary grinding distance is preferably 10 to 60 mm, more preferably 25 to 55 mm, and particularly preferably 40 to 50 mm. When longer than 60 mm, a processing mark formed by the first rotating grindstone remains in the first tapered region 136 formed in the first tapered region forming region 146 formed by the second rotating grindstone, and the second Processing traces from the rotating grindstone may remain and a sufficiently smooth surface may not be formed. When shorter than 10 mm, the hard part including the first end 140a is ground with the second rotating grindstone having a lower hardness than the first rotating grindstone, and the wear of the second rotating grindstone is increased.

  The second preliminary grinding distance is preferably 10 to 60 mm, more preferably 25 to 55 mm, and particularly preferably 40 to 50 mm. If it is longer than 60 mm, a processing mark formed by the first rotating grindstone remains in the second taper region 137 formed in the second tapered region forming region 147 by the second rotating grindstone, and the second rotating grindstone Processing traces may remain and a sufficiently smooth surface may not be formed. If it is shorter than 10 mm, the hard part including the second end 140b is ground with the second rotating grindstone that is not harder than the first rotating grindstone, and the wear of the second rotating grindstone increases. The second preliminary grinding distance may be the same as the first preliminary grinding distance.

  Next, a series of preliminary grinding steps for forming the preliminarily ground honeycomb aggregate 140 will be described. The preliminarily ground honeycomb aggregate 140 shown in FIG. 3 (a) is subjected to first grinding while rotating the honeycomb aggregate 120 shown in FIG. 2 (a) around the rotation axis L1 along the longitudinal direction. Formed by grinding with a first rotating grindstone of the means.

  In the first preliminary grinding step shown in FIG. 4A, the honeycomb aggregate 120 is ground to form a first preliminary grinding region 144 in the outer peripheral surface 141 of the preliminarily ground honeycomb aggregate 140.

  In the pre-grinding step, the first end portion 120a and the second end portion 120b of the honeycomb aggregate 120 are gripped by a rotating device (not shown) in order to create a pre-ground honeycomb aggregate 140 having a partially cylindrical shape. And is driven to rotate at a predetermined rotational speed around the first axis L1 along the longitudinal direction. The second axis is parallel to the first axis L1 and is driven to rotate along the second axis L2 that can control the separation distance from the first axis L1, and moves along the second axis L2. A first rotating grindstone 20 that is rotationally symmetric about the axis L2 is provided. Then, the honeycomb aggregate 120 is ground by using the first rotating grindstone 20 that is rotated around the second axis L2 while being rotated around the first axis L1 by the rotating device.

  The first rotating grindstone 20 is formed with a predetermined diameter along the second rotation axis L2, has an outer peripheral portion 21 having a predetermined length in the direction of the second rotation axis L2, and is driven to rotate by the shaft 25. Has been. The hardness of the 1st rotary grindstone 20 should just be the hardness which can grind the hard part containing the 1st edge part 120a and the 2nd edge part 120b. The hardness of such a rotating grindstone 20 is defined by the particle size. Therefore, the particle size of the first rotating grindstone 20 may be a particle size that can grind a hard portion including the first end portion 120a and the second end portion 120b.

  Specifically, the particle size of the first rotating grindstone 20 is preferably 50 to 170, more preferably 60 to 160, still more preferably 70 to 150, and particularly preferably 80 to 140. If the particle size is smaller than 50 (coarse), processing traces may remain in the first pre-grinding region 144 and the like, and may not be sufficiently smooth. When the particle size is larger than 170 (fine), the wear of the first rotating grindstone 20 may be increased.

  Further, the hardness of the first rotating grindstone 20 may depend on the degree of concentration. The degree of concentration of the first rotating grindstone 20 may be a degree of concentration that can grind a hard portion including the first end 120a and the second end 120b. Specifically, the concentration of the first rotating grindstone 20 is preferably 50 to 85, more preferably 55 to 80, and particularly preferably 60 to 75. When the degree of concentration is less than 50 (sparse), the wear of the first rotating grindstone 20 may increase. When the degree of concentration is greater than 85 (dense), the processing time for the first pre-grinding region 144 or the like may be long.

  The length of the outer peripheral portion 21 in the second axis L2 direction, that is, the width of the outer peripheral portion 21 is preferably 3 to 120 mm, more preferably 4 to 110 mm, and particularly preferably 5 to 100 mm. If it is shorter than 3 mm, it may be necessary to slow down the moving speed of the first rotating grindstone 20 in order to sufficiently smooth the first preliminary grinding region 144 and the like. Further, when the moving speed of the first rotating grindstone 20 is not slowed down, spiral uncut material may be generated. When the length is longer than 120 mm, the mass of the first rotating grindstone 20 becomes large, and vibration (“blurring of the rotation center (center axis))” may occur during rotation.

  The diameter of the first rotating grindstone 20 is preferably 200 to 400 mm, more preferably 250 to 390 mm, and particularly preferably 280 to 380 mm. When the diameter is smaller than 200 mm, it may be necessary to shorten the width of the outer peripheral portion 21. When the diameter is longer than 400 mm, the mass of the first rotating grindstone 20 becomes large, and vibration ("blur" of the rotation center (center axis)) may occur during rotation.

  The material of the first rotating grindstone 20 is not particularly limited as long as it can grind the honeycomb fired body 110 constituting the honeycomb aggregate 120. Specifically, diamond abrasive grains fixed (hardened) with metal bonds can be used. The first rotating grindstone 20 may be one in which the structure of the main body is formed of a metal such as iron and a layer of abrasive grains is formed on the surface of the outer peripheral portion 21.

  In the first pre-grinding step shown in FIG. 4A, the first pre-grinding wheel 20 is formed in the honeycomb aggregate 120 in order to form the first pre-grinding region 144 in the outer peripheral surface of the honeycomb aggregate 120. The first end portion 120a is moved from the first end portion 120a toward the second end portion 120b along the second axis L2 over the first preliminary grinding distance. In the first pregrinding step, the distance between the first axis L1 and the second axis L2 so that the first pregrind area 144 having a pregrind diameter is formed as the outer peripheral surface of the honeycomb aggregate 120. Is set to the first preliminary grinding separation distance.

  In FIG. 4A, the grinding is advanced from the first end portion 120a of the honeycomb aggregate 120 by the first rotating grindstone 20 moving along the second axis L2, and the first rotating grindstone 20 A state in which the first preliminary grinding region 144 is formed in the honeycomb aggregate 120 is shown.

  Here, for the sake of convenience, the first preliminary grinding region 144 formed in the honeycomb aggregate 120 will be indicated by the reference numerals corresponding to the pre-ground honeycomb aggregate 140 shown in FIG. The same applies to the following. Moreover, the arrow drawn on the upper part of the 1st rotary grindstone 20 has shown the direction where the 1st rotary grindstone 20 moves along the 2nd axis | shaft L2. The same applies to the following.

  The moving speed at which the first rotating grindstone 20 moves along the second axis L2 is preferably 20 to 1300 mm / min, more preferably 25 to 1200 mm / min, and particularly preferably 30 to 1100 mm / min. If it is faster than 1300 mm / min, the first preliminary grinding region 144 may not be sufficiently smooth. If it is slower than 20 mm / min, the grinding time may be too long. The same applies to the following.

  The rotation speed when rotating the honeycomb aggregate 120 around the first axis L1 is not particularly limited, but is preferably 200 to 450 rpm, more preferably 250 to 400 rpm, and particularly preferably 280 to 380 rpm. If the rotation speed is lower than 200 rpm, the surface of the first preliminary grinding region 144 may not be sufficiently smooth. If the rotation speed is higher than 450 rpm, the load on the rotating device increases, and a large-scale device may be required.

  Moreover, the rotational speed when rotating the first rotating grindstone 20 around the second axis L2 is not particularly limited, but is preferably 2000 to 5000 rpm, more preferably 2500 to 4500 rpm, and particularly preferably 3000 to 4000 rpm. . If the rotation speed is lower than 2000 rpm, the surface of the first pre-grinding region 144 may not be sufficiently smooth. If the rotational speed is higher than 5000 rpm, the load on the rotating device increases, and a large-scale device may be required.

  When the width of the outer peripheral portion 21 of the first rotating grindstone 20 is larger than the first preliminary grinding region 144, the first rotating grindstone 20 is not moved along the second axis L2, and the first rotating grindstone 20 is moved. A pre-grinding region 144 can be formed. Therefore, in such a case, it is not necessary to move the first rotating grindstone 20 along the second axis L2.

  In the second preliminary grinding step shown in FIG. 4B, the honeycomb aggregate 120 is ground to form a second preliminary ground region 149 in the outer peripheral surface of the honeycomb aggregate 120.

  In the second pre-grinding step, the first pre-grinding region 149 is formed so that the first rotating grindstone 20 is directed from the second end 120b of the honeycomb aggregate 120 toward the first end 120a. And moved along the second axis L2 over a second pregrinding distance. In the second preliminary grinding step, the distance between the first axis L1 and the second axis L2 so that the second preliminary grinding region 149 having a preliminary grinding diameter is formed as the outer peripheral surface of the honeycomb aggregate 120. Is set to the second preliminary grinding separation distance.

  In addition, when the width | variety of the outer peripheral part 21 of the 1st rotary grindstone 20 is larger than the 2nd preliminary grinding area | region 149, the 2nd without moving the 1st rotary grindstone 20 along the 2nd axis | shaft L2. A pre-grinding region 149 can be formed. Therefore, in such a case, it is not necessary to move the first rotating grindstone 20 along the second axis L2.

  In the present embodiment, in the first and second preliminary grinding steps, the hard part including the first end portion 120a and the second end portion 120b of the honeycomb aggregate 120 is harder than the second rotating grindstone. Grinding is performed by one rotating grindstone 20. Therefore, such a hard portion can be efficiently ground by the first rotating grindstone 20, and the wear of the hard portion by the second rotating grindstone can be reduced to reduce its wear.

  Fig.5 (a) is a perspective view which shows typically an example of a ceramic block, FIG.5 (b) is a side view of the ceramic block shown to Fig.5 (a). In the ceramic block 130 shown in FIG. 5A, the side surface of the cylinder when the ceramic block 130 is regarded as a cylinder is defined as the outer peripheral surface 131 of the ceramic block. Further, the first tapered region 136, the second tapered region 137, and the central grinding region 138 of the ring-shaped convex portion 135 are also included in the outer peripheral surface 131 of the ceramic block 130.

  A ring-shaped convex portion 135 is provided at the central portion of the ceramic block 130 in the longitudinal direction (the direction indicated by the double arrow a in FIG. 5B). The ring-shaped convex portion 135 surrounds the outer periphery when the ceramic block 130 is regarded as a cylinder and protrudes in a bowl shape toward the outside of the ceramic block 130, and includes a first tapered region 136, a second tapered region 137, and central grinding. A region 138 is included.

  When the shape of the part excluding the ring-shaped convex part 135 of the ceramic block 130 is a columnar shape, as an example of the dimension, the diameter of the column is about 100 to 170 mm, and the length in the longitudinal direction is 100 to 170 mm. Things can be raised. Moreover, as a shape of a ring-shaped convex part, the thing whose height is 4-8 mm and whose width is 17-24 mm is mentioned. The width and height of the ring-shaped convex portion 135 are the dimensions indicated by double arrows X1 and Y1 in FIG.

  The shape and size of the ceramic block 130 and the shape and size of the ring-shaped convex portion 135 can be arbitrarily set depending on the size of the vehicle or the like to be installed after forming the honeycomb structure. It is not limited. Examples of the shape of the portion excluding the ring-shaped convex portion 135 of the ceramic block 130 include a columnar example in which the bottom surface shape is an ellipse, a race track shape, etc. in addition to a circular column.

  Next, a series of main grinding steps for forming such a ceramic block 130 will be described. The ceramic block 130 shown in FIG. 5 (a) is a second grinding means while rotating the pre-ground honeycomb aggregate 140 shown in FIG. 3 (a) around the rotation axis L1 along the longitudinal direction. The second rotating grindstone is used for grinding.

  In the first main grinding step shown in FIG. 6A, the preliminarily ground honeycomb aggregate 140 is ground, and the first ground region 134 and the first taper region in the outer peripheral surface 131 of the ceramic block 130 are ground. 136 is formed. The first taper region 136 connects the first grinding region 134 and the central grinding region 138.

  In the main grinding step, as in the pre-grinding step, the first end portion 120a and the second end portion 120b of the honeycomb aggregate 120 are gripped by a rotating device (not shown) in order to form the ceramic block 130 having a substantially cylindrical shape. It is sandwiched and held by means, and is driven to rotate at a predetermined rotational speed around the first axis L1 along the longitudinal direction. Further, a third axis that is parallel to the first axis L1, is rotationally driven along a third axis L3 that can control the separation distance from the first axis L1, and moves along the third axis L3. A second rotating grindstone 10 that is rotationally symmetric about the axis L2 is provided. Then, the preliminarily ground honeycomb aggregate 140 is ground around the first axis L1 by the rotating device and is ground using the second rotating grindstone 10 that is rotationally driven around the third axis L3. Yes.

  The second rotating grindstone 10 is formed with a predetermined diameter along the third rotation axis L3 and has an outer peripheral portion 11 having a predetermined length in the direction of the third rotation axis L3. In addition, the first tapered portion 12 having a predetermined length gradually decreases in diameter from the outer peripheral portion 11 to the first end portion 140a side of the honeycomb aggregate 140 preliminarily ground along the third rotation axis L3. Yes. Furthermore, the second tapered portion 13 having a predetermined length gradually decreases in diameter from the outer peripheral portion 11 to the second end portion 140b side of the honeycomb aggregate 140 preliminarily ground along the third rotation axis L3. ing. The first tapered portion 12 and the second tapered portion 13 are formed so as to be symmetric with respect to one plane orthogonal to the third axis L3.

  Here, the second rotating grindstone 10 may not be harder than the first rotating grindstone 20. Therefore, the particle size of the second rotating grindstone 10 is such that the portion of the pre-ground honeycomb aggregate 140 excluding the hard portion including the first end portion 140a and the second end portion 140b can be ground. And the particle size of the first rotating grindstone 20 is smaller. Specifically, 130 to 300 are preferable, 160 to 250 are more preferable, and 180 to 230 are particularly preferable. If the particle size is smaller (rougher) than 130, a processing mark may remain in the first grinding region 134 and the like, and may not be sufficiently smooth. When the particle size is larger (fine) than 300 mm, the wear of the second rotating grindstone 10 may be increased.

  Further, the hardness of the second rotating grindstone 10 may depend on the degree of concentration. The concentration of the second rotating grindstone 10 is such that the portion of the pre-ground honeycomb aggregate 140 excluding the hard portion including the first end portion 140a and the second end portion 140b can be ground. The degree of concentration is generally larger than the concentration of the first rotating grindstone 20. Specifically, 65 to 135 are preferable, 70 to 130 are more preferable, and 75 to 125 are particularly preferable. When the degree of concentration is less than 65 (becomes sparse), the wear of the second rotating grindstone 10 may increase. When the degree of concentration is higher (dense) than 135, the processing time for the first grinding region 134 and the like may be longer.

  The length of the outer peripheral portion 11 in the third axis L3 direction, that is, the width of the outer peripheral portion 11 is preferably 30 to 120 mm, more preferably 40 to 110 mm, and particularly preferably 50 to 100 mm. If it is shorter than 30 mm, it may be necessary to slow down the moving speed of the second rotating grindstone 10 in order to sufficiently smooth the first grinding region 134 and the like. Further, when the moving speed of the second rotating grindstone 10 is not slowed down, spiral uncut material may be generated. When the length is longer than 120 mm, the mass of the second rotating grindstone 10 becomes large, and vibration ("blurring" of the rotation center (center axis)) may occur during rotation.

  The second rotary grindstone 10 has the lengths of the first taper portion 12 and the second taper portion 13 in the direction of the third axis L3, that is, the widths of the first taper portion 12 and the second taper portion 13 are: It is preferably 5 to 40 mm, more preferably 6 to 30 mm, and particularly preferably 7 to 20 mm. When the length is shorter than 5 mm, the first tapered portion 12 and the like are small, and it may be difficult to form a desired first tapered region 136 surface and the like. If it is longer than 40 mm, the width of the outer peripheral portion 11 becomes relatively short, the grinding time becomes longer, and the surface formed by grinding of the obtained ceramic block 130 becomes not sufficiently smooth. The widths of the first taper portion 12 and the second taper portion 13 may be different sizes.

  The diameter of the second rotating grindstone 10 is preferably 200 to 400 mm, more preferably 250 to 390 mm, and particularly preferably 280 to 380 mm. If the diameter is smaller than 200 mm, it may be necessary to shorten the width of the first tapered portion 12 or the like and the width of the outer peripheral portion 11. If the diameter is longer than 400 mm, the mass of the second rotating grindstone 10 becomes large, and vibrations (“blurring of the rotation center (center axis))” may occur during rotation.

  The material of the second rotating grindstone 10 is not particularly limited as long as it can grind the honeycomb fired body 110 constituting the preliminarily ground honeycomb aggregate 140. Specifically, diamond abrasive grains fixed (hardened) with metal bonds can be used. The second rotating grindstone 10 has a main body structure made of metal such as iron and the like, and a layer of abrasive grains is formed on the surface of the outer peripheral portion 11, the first tapered portion 12, and the second tapered portion 13. It may be a thing.

  In the first main grinding step shown in FIG. 6A, the second grinding wheel 10 is formed to form the first grinding region 134 and the first taper region 136 in the outer peripheral surface 131 of the ceramic block 130. Is moved over a first distance along the third axis L3 from the first end 140a of the pre-ground honeycomb aggregate 140 toward the second end 140b. In the first main grinding step, the first axis L1 and the second axis are formed so that the first grinding region 134 having the first diameter is formed as the outer peripheral surface 131 of the preliminarily ground honeycomb aggregate 140. The distance between the axes L2 is set to the first separation distance.

  FIG. 6A shows a honeycomb preliminarily ground to a pregrind diameter from the first end 140a over a first pregrind distance by the second rotating grindstone 10 moving along the third axis L3. Grinding proceeds from the first end 140a of the aggregate 140, and the first ground region 134 and the first tapered region 136 are formed in the preliminarily ground honeycomb aggregate 140 by the second rotary grindstone 10. Shows the state.

  Here, for convenience, the first grinding region 134 and the first taper region 136 formed in the pre-ground honeycomb aggregate 140 are indicated by reference numerals of corresponding portions of the ceramic block 130 shown in FIG. To do. The same applies to the following. Moreover, the arrow drawn on the upper part of the 2nd rotating grindstone 10 has shown the direction where the 2nd rotating grindstone 10 moves along the 3rd axis | shaft L3. The same applies to the following.

  The moving speed at which the second rotating grindstone 10 moves along the third axis L3 is preferably 20 to 1300 mm / min, more preferably 25 to 1200 mm / min, and particularly preferably 30 to 1100 mm / min. If it is faster than 1300 mm / min, the first grinding region 134 and the first taper region 136 may not be sufficiently smooth. If it is slower than 20 mm / min, the grinding time may be too long. The same applies to the second and third main grinding steps.

  The rotational speed when the pre-ground honeycomb aggregate 140 is rotated about the first axis L1 is not particularly limited, but is preferably 200 to 450 rpm, more preferably 250 to 400 rpm, and particularly preferably 280 to 380 rpm. preferable. If the rotation speed is lower than 200 rpm, the surfaces of the first grinding region 134 and the first taper region 136 may not be sufficiently smooth. If the rotation speed is higher than 450 rpm, the load on the rotating device increases, and a large-scale device may be required.

  Moreover, the rotational speed when rotating the second rotating grindstone 10 around the third axis L3 is not particularly limited, but is preferably 2000 to 5000 rpm, more preferably 2500 to 4500 rpm, and particularly preferably 3000 to 4000 rpm. . If the rotation speed is lower than 2000 rpm, the surfaces of the first grinding region 134 and the first taper region 136 may not be sufficiently smooth. If the rotational speed is higher than 5000 rpm, the load on the rotating device increases, and a large-scale device may be required.

  In the first main grinding step, the second rotary grindstone 10 is ground over the first distance from the first end 140a of the preliminarily ground honeycomb aggregate 140 by the second rotary grindstone 10, and the second rotary grindstone 10 A first grinding region 134 is formed by the outer peripheral portion 11. And the 1st taper area | region 136 is formed with the 2nd taper part 13 of the 2nd rotary grindstone 10 with it. The taper angle of the second taper portion 13 of the second rotating grindstone 10 is the same as the taper angle of the first taper region 136 of the preliminarily ground honeycomb aggregate 140.

  In the first main grinding step, since the hard portion including the first end portion 140a is previously ground as the first preliminary grinding region, such a hard portion is ground by the second rotating grindstone 10. The amount is reduced. Therefore, the wear of the second rotary grindstone 10 in the first main grinding process can be reduced.

  In the second main grinding step shown in FIG. 6B, the honeycomb aggregate 140 preliminarily ground following the first main grinding step is ground, and the central grinding region of the outer peripheral surface 131 of the ceramic block 130 is ground. 138 is formed. In the second main grinding step, in order to form the central grinding region 138, the second rotary grindstone 10 is moved from the position where the first grinding step is finished toward the second end portion 140b with the third shaft. Grinding is advanced over a second distance along L3. In the second main grinding step, the distance between the first axis L1 and the second axis L2 is the first so that a central grinding region 138 having a second diameter larger than the first diameter is formed. The second separation distance is set to be larger than the second separation distance.

  In the second main grinding step, a portion corresponding to the top of the ring-shaped convex portion 135 of the ceramic block 130 is ground by the outer peripheral portion 11 of the second rotating grindstone 10, and the preliminarily ground honeycomb aggregate 140 is preliminarily ground. A central grinding region 138 is formed.

  After the second main grinding step, the second rotary grindstone 10 is moved away from the pre-ground honeycomb aggregate 140 and moved outside the second end portion 140b of the pre-ground honeycomb aggregate 140. Is preferred. And it is preferable to perform a 3rd this grinding process after that.

  In the third main grinding step shown in FIG. 6C, the preliminarily ground honeycomb aggregate 140 is ground, and the second grinding region 139 and the second taper region in the outer peripheral surface 131 of the ceramic block 130 are ground. 137 is formed. The second taper region 137 connects the second grinding region 139 and the central grinding region 138.

  In the third main grinding step, in order to form the second grinding region 139 and the second taper region 137, the second rotating grindstone 10 is provided with the second end 140b of the preliminarily ground honeycomb aggregate 140. To the first end 140a along the third axis L3 over a third distance. In the third main grinding step, the first axis L1 and the second axis are formed so that the second grinding region 139 having the first diameter is formed as the outer peripheral surface 131 of the preliminarily ground honeycomb aggregate 140. The distance between the axes L3 is set to the first separation distance.

  In the third main grinding step, the second rotary grindstone 10 is ground for a third predetermined distance from the second end 140b of the preliminarily ground honeycomb aggregate 140, and the second rotary grindstone A second grinding region 139 is formed by 10 outer peripheral portions 11. And the 2nd taper area | region 137 is formed with the 1st taper part 12 of the 2nd rotary grindstone 10 with it. The taper angle of the first taper portion 12 of the second rotating grindstone 10 is the same as the taper angle of the second taper region 137 of the honeycomb aggregate 120.

  In the third main grinding step, since the hard portion including the second end portion 140b is ground in advance as the second preliminary grinding region, such a hard portion is ground by the second rotating grindstone 10. The amount is reduced. Therefore, wear of the second rotating grindstone 10 in the third main grinding step can be reduced.

  According to the present embodiment, regarding the formation of the ring-shaped convex portion 135, the first tapered region 136 is formed in the first main grinding step, the center grinding region 138 is formed in the second main grinding step, In the third main grinding step, the second tapered region 137 is formed. In other words, the step of grinding the portion corresponding to the top of the ring-shaped convex portion 135 to form the central grinding region 138 is performed before both the first tapered region 136 and the second tapered region 137 are formed. Has been done.

  Therefore, there is no need to form the central grinding region 138 by grinding the top of the ring-shaped convex portion 135 having a tapered shape in which sufficient strength cannot be secured, and in the step of grinding and forming the central grinding region 138 of the ring-shaped convex portion 135. Moreover, the damage of the ring-shaped convex part 135 can be reduced. In other words, in the step of forming the outer peripheral surface 131 including the ring-shaped convex portion 135, the ring-shaped convex portion 135 can be prevented from being damaged.

  The honeycomb structure 100 shown in FIG. 7A is manufactured by forming the outer peripheral sealing material layer 102 on the outer peripheral surface 131 of the ceramic block 130 shown in FIG. The outer peripheral sealing material layer 102 is also formed on the ring-shaped convex portion 105, and the outer peripheral sealing material layer 102 is formed on the first tapered region 106, the second tapered surface 107, and the central grinding region 108 of the ring-shaped convex portion 105. Except for the above, the ceramic block 130 has the same shape as each part.

  The thickness of the outer peripheral sealing material layer 102 is preferably a thickness that can fill the through hole exposed on the outer peripheral surface 131 of the ceramic block 130. Specifically, the thickness of the outer peripheral sealing material layer 102 is preferably 0.05 to 0.3 mm. The thickness of the outer peripheral sealing material layer 102 means not the thickness of the outer peripheral sealing material layer in the ring-shaped convex portion 105 but the thickness of the outer peripheral sealing material layer 102 in a portion other than the ring-shaped convex portion 105.

  The outer peripheral surface 101 of the honeycomb structure 100 shown in FIG. 7A is a smooth surface in which the through holes 111 exposed on the outer peripheral surface of the ceramic block 130 are filled with the outer peripheral sealing material layer 102. In the ring-shaped convex portion 105, the through hole 111 exposed on the outer peripheral surface 131 of the ceramic block 130 is a smooth surface filled with the outer peripheral sealing material layer 102.

  When the shape of the portion excluding the ring-shaped convex portion 105 of the honeycomb structure 100 is a columnar shape, as an example of the dimension, the diameter of the column is about 100.1 to 170.6 mm, and the length in the longitudinal direction is The thing which is 100-170 mm is mentioned. Moreover, as a shape of the ring-shaped convex part 105, that whose height is 4.4-8.7 mm and width is 17-24 mm is mentioned. Moreover, the angle at which the ring-shaped convex part rises is 25 to 45 °.

  The width and height of the ring-shaped convex portion 105 are the dimensions indicated by the double arrows X2 and Y2 in FIG. The angle at which the ring-shaped convex portion 105 rises is the angle represented by θ1 and θ2 in FIG. 7B. Note that the shape and size of the honeycomb structure 100 and the shape and size of the ring-shaped convex portion 105 can be arbitrarily set depending on the size of the vehicle or the like on which the honeycomb structure 100 is installed. It is not limited.

Examples of the shape of the portion excluding the ring-shaped convex portion 105 of the honeycomb structure 100 include a columnar example in which the bottom surface shape is an ellipse, a racetrack shape, etc. in addition to a circular column. When the honeycomb structure 100 has the ring-shaped protrusion 105, the ring-shaped protrusion 105 is caught by the holding sealing material when the honeycomb structure 100 is housed in the casing via the holding sealing material. The movement of the honeycomb structure 100 within the casing can be restricted.
[Modification 1]
Next, as a first modification of the present embodiment, a series of other main grinding steps for forming the ceramic block 130 by grinding the preliminarily ground honeycomb aggregate 140 will be described. This series of other main grinding steps forms a first grinding region 134 and a first tapered region 136, followed by a second grinding region 139 and a second tapered region 137, and finally a central grinding. Region 138 is formed.

  In this series of other main grinding steps, differences from the step of grinding the pre-ground honeycomb aggregate 140 shown in the present embodiment to form the ceramic block 130 will be mainly described. Parts to be omitted may be omitted unless necessary. Preliminarily ground honeycomb aggregate 140 used in a series of other main grinding steps, rotating device for holding and rotating the honeycomb aggregate 140, configurations of the first axis L1, the third axis L3, etc., dimensions of each component, etc. Is the same as in the present embodiment.

  In the first other main grinding step shown in FIG. 8A, the first ground region 134 and the first tapered region 136 are formed as the outer peripheral surface 131 of the preliminarily ground honeycomb aggregate 140. The second rotating grindstone 10 is moved over a first distance along the third axis L3 from the first end 140a of the pre-ground honeycomb aggregate 140 toward the second end 140b. The In this first other grinding step, the first axis L1 and the first axis L1 are formed so that the first grinding region 134 having the first diameter is formed as the outer peripheral surface 131 of the preliminarily ground honeycomb aggregate 140. The interval between the three axes L3 is set to the first separation distance.

  In the second other main grinding step (fourth main grinding step) shown in FIG. 8B, the second rotating grindstone 10 is formed in order to form the second grinding region 139 and the second taper region 137. Is moved from the second end 140b of the pre-ground honeycomb aggregate 140 toward the first end 140a over a third distance along the third axis L3. In the second other main grinding step, the first axis L1 and the first axis L1 are formed so that the second grinding region 139 having the first diameter is formed as the outer peripheral surface 131 of the preliminarily ground honeycomb aggregate 140. The interval between the third axes L3 is set to the first separation distance.

  In the third other main grinding step (fifth main grinding step) shown in FIG. 8C, the second rotating grindstone 10 is used for the second other main grinding step in order to form the central grinding region 138. It moves over the 2nd predetermined distance along the 3rd axis | shaft L3 toward the 1st edge part 120a from the position which finished the process. In the third other main grinding step, the distance between the first axis L1 and the third axis L3 is set so that a central grinding region 138 having a second diameter larger than the first diameter is formed. The second separation distance is set to be larger than the first separation distance.

  Also in such a series of other main grinding steps, in the first and second other main grinding steps, a hard portion including the first end portion 140a and the like is ground in advance as the first preliminary grinding region 144 and the like. Therefore, the amount of grinding such a hard portion by the second rotating grindstone 10 is reduced. Therefore, the wear of the second rotary grindstone 10 in the first and third grinding steps can be reduced.

[Modification 2]
Next, as a second modification of the present embodiment, a case where a ceramic molded body is used instead of the honeycomb structure for a ceramic porous body that collects particulates (PM) will be described.

  FIG. 9A is a perspective view schematically showing an example of the ceramic molded body 220. The ceramic molded body 220 is formed by extruding a porous ceramic material such as cordierite into a predetermined shape. Here, the ceramic molded body 220 is formed in a substantially rotationally symmetric columnar shape about the first rotation axis L1 passing through the approximate center of the first end 220a and the second end 220b.

  FIG. 9B is a perspective view showing a pre-ground ceramic molded body. The preliminary grinding was performed under the same conditions as in the above embodiment. On the outer peripheral surface 241 of the preliminarily ground ceramic molded body 240, a first preliminary grinding region 244 having a preliminary grinding diameter in a direction from the first end 240a to the second end 240b is formed. A second preliminary grinding region 249 having a preliminary grinding diameter is formed in a direction from the end 240b toward the first end 240a.

  The first pre-grinding region 244 and the second pre-grinding region 249 rotate the ceramic molded body 220 around the first rotation axis L1, and the first end within the outer peripheral surface 241 of the ceramic molded body 240. The hard portion including the portion 220a and the second end portion 220b was formed by pre-grinding with a hard first rotating grindstone rotating around the second rotating shaft L2 parallel to the first rotating shaft L1.

  In the ceramic molded body 240, regions corresponding to a first tapered region 236, a second tapered region 237, and a central grinding region 238 constituting a ring-shaped convex portion 235 described later are ring-shaped convex portion forming regions 245. Are shown as a first tapered region forming region 246, a second tapered region forming region 247, and a central ground region forming region 248.

  FIG. 9C is a perspective view showing a ceramic block. The ceramic block 230 was created by main grinding under the same conditions as in the present embodiment described above. A first grinding region 234 having a first diameter is formed on the outer peripheral surface 231 of the ceramic block 230 in a direction from the first end portion 230a to the second end portion 230b, and from the second end portion 230b. A second grinding region 239 having the same first diameter is formed in the direction toward the first end 230a. Further, the ring-shaped convex portion 235 is formed with a first taper region 236, a second taper region 237, and a central grinding region 238.

  The first grinding region 234 and the second grinding region 239 rotate the pre-ground ceramic molded body 240 around the first rotation axis L1, and a third rotation axis parallel to the first rotation axis L1. It formed by the main grinding which sharpens with the 2nd rotating grindstone rotating around L3. Moreover, the 1st taper area | region 236, the 2nd taper area | region 237, and the center grinding area | region 238 which has a 2nd diameter larger than a 1st diameter were also formed with the 2nd rotary grindstone.

  Here, in the ceramic block 230, the hard first end portion 230a and the second end portion 230b are already processed by preliminary grinding. Therefore, it is not necessary for the second rotating grindstone to cut a hard portion, and it is sufficient that the second rotating grindstone has a hardness capable of cutting the pre-ground ceramic molded body 240.

  FIG.9 (d) is a perspective view which shows the ceramic filter comprised by the ceramic molded body. This ceramic filter was produced from the ceramic block 230 under the same conditions as in the above-described embodiment.

  The ceramic filter 200 is formed by forming the outer peripheral sealing material layer 202 on the outer peripheral surface 231 in the ceramic block 230 shown in FIG. The outer peripheral sealing material layer 202 is also formed on the ring-shaped convex portion 205. In the ring-shaped convex portion 205 sandwiched between the first grinding region 204 and the second grinding region 209, the first tapered region 206 and the first tapered region 206. The second tapered surface 207 and the center grinding region 208 are present in the same shape as each part in the ceramic block 130 except that the outer peripheral sealing material layer 102 is formed.

  In the second modification, the ceramic block 230 shown in FIG. 9C is formed from the pre-ground ceramic molded body 240 shown in FIG. 9B by the main grinding process according to the above-described embodiment. Not limited to that. For example, it can also be created by another main grinding process as shown in the second modification.

DESCRIPTION OF SYMBOLS 10 2nd rotating grindstone 11 Outer peripheral part 12 1st taper part 13 2nd taper part 20 1st rotating grindstone 21 Outer peripheral part 100 Honeycomb structure 110 Honeycomb fired body 111 Through-hole 112 Sealing material 120 Honeycomb aggregate 130 Ceramic block 131 Outer peripheral surface 104, 134, 234 First grinding area 105, 135, 235 Ring-shaped convex part 106, 136, 236 First taper area 107, 137, 237 Second taper area 108, 138, 238 Center Grinding region 109, 139, 239 Second grinding region 144, 244 First pre-grinding region 149, 249 Second pre-grinding region 220 Ceramic molded body

Claims (12)

For a ceramic porous body capable of collecting particulates by a porous ceramic material, the ceramic porous body is rotationally driven around a first axis extending in the longitudinal direction to control a distance from the first axis. Using the first or second grinding means possible, the ceramic porous body is ground for a predetermined distance in the longitudinal direction from the first end to the second end, and the first The grinding means is a method of manufacturing a ceramic filter harder than the second grinding means,
A preliminary grinding step of grinding a portion including the first and second ends of the ceramic porous body using the first grinding means;
And a main grinding step of grinding the ceramic porous body using the second grinding means.   The ceramic porous body includes a plurality of prismatic porous ceramic members each having a plurality of through holes arranged in parallel in the longitudinal direction with a partition wall therebetween, and a first and second in the longitudinal direction. The method for manufacturing a ceramic filter according to claim 1, wherein the honeycomb structure is provided with a sealing portion at an end portion thereof.   The method for producing a ceramic filter according to claim 1, wherein the ceramic porous body is a ceramic molded body obtained by extruding a porous ceramic material into a predetermined shape. The preliminary grinding step includes
A first preliminary grinding step of forming a first preliminary grinding region having a preliminary grinding diameter over a first preliminary grinding distance in a direction from the first end toward the second end;
A second preliminary grinding step of forming a second preliminary grinding region having the preliminary grinding diameter over a second preliminary grinding distance in a direction from the second end portion toward the first end portion. The manufacturing method of the ceramic filter in any one of Claim 1 to 3 containing. The main grinding process includes
A first main grinding step for forming a first grinding region having a first diameter over a first distance in a direction from the first end toward the second end;
Subsequent to the first main grinding step, a second grinding region is formed which has a central grinding region having a second diameter larger than the first diameter over a second distance in a direction toward the second end. The main grinding process;
A third main grinding step of forming a second grinding region having the first diameter over a third distance in a direction from the second end toward the first end. Item 5. A method for producing a ceramic filter according to any one of Items 1 to 4.   The first grinding means is rotationally symmetric about the second axis that is driven to rotate about a second axis that is parallel to the first axis and capable of controlling a distance from the first axis. The method for manufacturing a ceramic filter according to claim 5, wherein the ceramic filter includes an outer peripheral portion having a predetermined diameter.   The second grinding means is parallel to the first axis and is rotationally symmetric about the third axis that is driven to rotate about a third axis that can control the distance from the first axis. A rotating grindstone having a predetermined diameter, a first tapered portion having a diameter that decreases from the outer peripheral portion toward the first end portion, and the first outer portion from the outer peripheral portion. The method for manufacturing a ceramic filter according to claim 6, further comprising: a second taper portion having a diameter that decreases toward the end of the second portion. In the first main grinding step, the first grinding region is formed on the outer peripheral portion of the second rotating grindstone, and the first grinding is performed on the second tapered portion of the second rotating grindstone. Forming a first tapered region connecting from the region to the central grinding region;
In the third main grinding step, the second grinding region is formed at the outer peripheral portion of the second rotating grindstone, and the second grinding is performed at the first tapered portion of the second rotating grindstone. The method for manufacturing a ceramic filter according to claim 7, wherein a second tapered region connected from the region to the central grinding region is formed. The main grinding process includes
A first main grinding step for forming a first grinding region having a first diameter over a first distance in a direction from the first end toward the second end;
A fourth main grinding step for forming a second grinding region having the first diameter over a third distance in a direction from the second end toward the first end;
Subsequent to the fourth main grinding step, a fifth ground region is formed which has a second diameter larger than the first diameter over a second distance in a direction toward the first end. The main grinding process;
The manufacturing method of the ceramic filter in any one of Claim 1 to 4 containing these.   The first grinding means is rotationally symmetric about the second axis that is driven to rotate about a second axis that is parallel to the first axis and capable of controlling a distance from the first axis. The method for producing a ceramic filter according to claim 9, wherein the ceramic filter includes an outer peripheral portion having a predetermined diameter.   The second grinding means is parallel to the first axis and is rotationally symmetric about the third axis that is driven to rotate about a third axis that can control the distance from the first axis. A rotating grindstone having a predetermined diameter, a first tapered portion having a diameter that decreases from the outer peripheral portion toward the first end portion, and the first outer portion from the outer peripheral portion. The method for manufacturing a ceramic filter according to claim 10, further comprising: a second taper portion having a diameter that decreases toward the end of the second portion. In the first main grinding step, the first grinding region is formed on the outer peripheral portion of the second rotating grindstone, and the first grinding is performed on the second tapered portion of the second rotating grindstone. Forming a first tapered region connecting from the region to the central grinding region;
In the fourth main grinding step, the second grinding region is formed at the outer peripheral portion of the second rotating grindstone, and the second grinding is performed at the first tapered portion of the second rotating grindstone. The method for manufacturing a ceramic filter according to claim 11, wherein a second tapered region connected from the region to the central grinding region is formed.

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