JPH07195251A - Chip suction device in end mill processing - Google Patents

Abstract

(57) [Summary] [Structure] A chip suction portion 13 defining a chip suction space 22 is provided on the outer periphery of the end mill 1 so as to surround the periphery of a portion of the end mill 1 which is closer to the base end side than the cutting blade portion 5. A chip storage unit 12 that defines a chip storage space 19 that communicates with the chip suction space 22 is provided on the base end side. Also, the chip suction space 22
A chip suction means 15 for forming a negative pressure in the vicinity of the tip opening portion 23 of the chip suction portion 13 by forming a flow of air from the tip end toward the base end side is provided in the end mill 23. An arc-shaped plate-shaped chip guide plate 14 is provided so as to partially surround the periphery of the cutting edge portion 5. [Effect] Even in the groove processing and the shoulder milling processing by the end mill 1, the generated chips C can be evenly and reliably sucked and collectively processed. Also, especially the depth of cut D
Even if is large, the chips C can be reliably sucked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip suction device in end mill processing for sucking chips generated in end mill processing.

[0002]

2. Description of the Related Art An end mill is used when grooving a work material, or when forming a concave wall portion which is recessed from the side surface of the work material, that is, when so-called shoulder milling. . In this type of end mill, a cutting edge is formed by providing a cutting edge on the outer periphery of the tip of a cylindrical shaft-shaped tool body, and the shank portion on the tool body proximal end side is the spindle end of a machine tool such as a machining center. The tool body is mounted on the machine and is rotated around its axis, while the feed is applied between the tool body and the work piece in the direction intersecting the axis line, thereby cutting the work material with the rotating cutting edge. .

By the way, regardless of the processing by such an end mill, in the cutting work for cutting the work material by the cutting blade provided in the tool body, it is important how to process the chips generated during the cutting. It becomes a problem. And, especially in the case of machining with a rolling tool whose tool body rotates like an end mill, the generated chips are scattered around as the tool body rotates, so the problem of chip disposal becomes even more important. Increase. Among the above-mentioned rolling tools, a chip suction type cutter has been proposed in Japanese Patent Application No. 62-263508 as a solution to the problem of chip disposal, for example. This cutter covers the outer circumference of a cutter body having a front cutting edge and a peripheral cutting edge with a chip storage body to form a chip discharge space between the chip storage body and the outer circumference of the cutter body, and A chip guide member for guiding chips to the chip discharge space is provided at the tip, and suction means is further connected to the chip container, and the chips generated by the cutting blade are introduced into the chip discharge space by the guide member. Further, by collectively sucking and discharging by the suction means, it is attempted to prevent chips from scattering and achieve efficient chip disposal.

[0004]

However, if the chip processing means in such a cutter (face milling cutter) is to be directly applied to the processing by the end mill, a new problem will occur. That is, the cutting by the front milling cutter is exclusively plane cutting, and the cutting depth by the outer peripheral cutting edge is relatively small, and therefore, the protrusion of the cutter body from the tip of the chip storage body can also be made small. With this, since the tip of the chip discharge space can be positioned very close to the cutting blade, the cutter guides the chips guided by the guide member quickly into the chip discharge space where a negative pressure is generated by the suction means. It is possible to take it in and discharge it reliably.

However, in the groove processing and shoulder milling processing by the end mill, the depth of cut by the outer peripheral cutting blade is relatively large. Therefore, when the same chip processing means as the above cutter is provided, the chip storage body starts from the tip of the chip storage body. Since the cutting edge portion of the end mill largely projects, the chip discharge space cannot be extended to the tip of the cutting edge portion. Therefore, even if the chip guide member is provided at the tip of the tool body, that is, the tip of the cutting blade, it is difficult to guide the chips generated at the tip of the cutting blade to the chip discharge space. Further, even if an attempt is made to suck chips by negative pressure in this chip discharge space by the suction means, at least one side of the groove and concave wall formed by the end mill is open, so sufficient suction force is applied to the groove and It is impossible to act even on the bottom of the concave wall, and the chips generated at the tip side of the cutting edge are no longer introduced into the chip discharge space, resulting in scattering around due to the rotation of the tool body. .

[0006]

DISCLOSURE OF THE INVENTION The present invention is a chip suction device made to solve the problems peculiar to machining by such an end mill, and is more suitable than a cutting edge portion of an end mill rotated around an axis. A cylindrical chip suction portion that is provided so as to surround the periphery of the base end side portion and defines a chip suction space between the outer peripheral surface of the end mill and a base end side of the chip suction portion. A chip storage part that defines a chip storage space that communicates with the chip suction space, and forms a flow of air from the tip to the base end side in the chip suction space to form near the tip opening of the chip suction part. A chip suction means for generating a negative pressure, and a circular arc plate-shaped chip guide provided on the peripheral edge of the tip opening of the chip suction part so as to partially surround the periphery of the cutting edge part of the end mill protruding from this opening. And a plate.

[0007]

In the chip suction device having the above-mentioned structure, the circular arc plate-shaped chip guide plate is provided around the cutting blade portion protruding from the tip of the chip suction portion so as to partially surround the cutting blade portion.
By inserting this guide plate into the groove together with the cutting blade, or by arranging so as to surround the cutting blade from the concave wall to the side surface of the work material, the chips generated on the tip side of the cutting blade are It can be guided along the guide plate and introduced into the chip suction portion. Further, by disposing this chip guide plate so as to close the open side of the groove or the concave wall portion, the chip guide plate and the wall surface of the groove or the concave wall portion are communicated with the chip suction space. It is possible to form a space around the cutting edge portion, whereby the suction force of the chip suction means can be applied to the tip side of the cutting edge portion. Therefore, according to the chip suction device configured as described above, the chips generated by the end milling process can be uniformly and surely introduced into the chip suction space, and the chips thus introduced are further introduced into the chip storage space of the chip storage portion. It becomes possible to send it in and process it efficiently.

[0008]

1 to 4 show one embodiment of the present invention. In these figures, reference numeral 1 is an end mill used for groove processing and shoulder milling processing. In this end mill 1, a pair of chip pockets 3, 3 are formed on the outer peripheral end of a tool body 2 having a cylindrical shaft shape. The insert-away tips 4 and 4 are attached to the wall surfaces of these tip pockets 3 and 3 which face the tool rotation direction (the arrow T direction in the figure), and are cut by the outer peripheral cutting edge 4A and the tip cutting edge (bottom blade) 4B. The blade portion 5 is provided. In the end mill 1, the shank 6 on the base end side is attached to a spindle 8 provided on a spindle head 7 on the machine tool side via an arbor 9, and as the spindle 8 rotates, the axis O of the tool main body 2 is rotated. Is rotated in the above-mentioned rotation direction, and the spindle head 7 is moved in a direction intersecting the axis O (direction orthogonal to the drawings in FIGS. 1 and 2; arrow F direction in FIGS. 3 and 4). Feeding is given by this, and the work W is cut by the cutting edges 4A and 4B.

On the other hand, a chip suction device 11 of this embodiment is attached to the spindle head 7 of the machine tool. The chip suction device 11 includes a chip storage portion 12 attached to the spindle head 7, a chip suction portion 13 attached to the tip end side of the chip storage portion 12, and the chip feeding portion 1.
3, a chip guide plate 14 attached to the tip of the chip 3, and a chip suction means 15 provided in the chip suction unit 13. The chip storage portion 12 is a cylindrical member that is detachably fixed to the tip end surface of the spindle head 7 by a mounting bolt 16, and is provided so as to cover the axis O as a center up to the substantially tip end portion of the arbor 9. Has been. Further, a disk-shaped lid 17 having a hole 17A in the center is detachably attached to the tip of the chip storage portion 12 by a mounting bolt 18, and an inner surface of the lid 17 facing the base end side. A chip storage space 19 is defined around the arbor 9 by the inner peripheral surface of the chip storage portion 12. The chip storage unit 12
A chip discharge pipe 20 is attached to the peripheral portion of the body, and a chip discharge path 21 that communicates with the chip storage space 19 and extends in a direction orthogonal to the axis O is formed.
Is connected to a chip collecting means such as a dust collector (not shown).

Further, the chip suction part 13 has the lid 17
Although it is a cylindrical member provided so as to face the central hole 17A, the inner diameter thereof is smaller than the inner diameter of the chip accommodating portion 12, and has a size that surrounds the outer periphery of the tool body 2 of the end mill 1. The chip storage space is provided so as to cover the cutting edge portion 5 of the end mill 1 up to the base end side around the axis O, and surrounds the outer circumference of the end mill 1 on the inner circumference of the chip suction portion 13. A chip suction space 22 communicating with 19 is defined. The chip suction unit 13
The tip opening 23 is formed so as to be slightly narrowed toward the inner peripheral side of the chip suction portion 13. Further, the chip guide plate 14 is a member having an arc-shaped cross section arranged around the cutting edge part 5 of the end mill 1 around the axis O, and is provided on the peripheral edge of the tip opening part 23 of the chip suction part 13. It is detachably attached, and is arranged so as to cover a part of the cutting edge portion 5 of the end mill 1 to the base end side slightly from the tip cutting edge 4B in the direction of the axis O. The chip guide plates 14 are available in various sizes, and depending on whether the end mill 1 is to be grooved or shoulder-milled.
Further, depending on the length and outer diameter of the cutting edge portion 5 of the end mill 1 in the direction of the axis O, that is, the cutting depth and the cutting width, the width and length in the circumferential direction can be appropriately selected and attached.

On the other hand, a cylindrical intermediate member 24 is attached to the inner circumference of the chip suction portion 13. The intermediate member 24 has its base end side screwed to the inner circumference of the chip suction unit 13, and its tip slightly closer to the base end side of the chip suction unit 13 facing the base end side of the tip opening 23. It is arranged so as to be located on the end side, and as a result, a minute annular gap (clearance) is formed between the tip surface of the intermediate member 24 and the inner end surface of the tip opening 23 of the chip suction portion 13. Two
5 will be formed. Further, on the outer peripheral surface of the intermediate member 24, two concave groove portions 26 and 27 which are concave toward the inner peripheral side are formed in the circumferential direction of the intermediate member 24, and the concave groove portions 26 and 27 and the chips are formed. A compressed air ejection space 28 that communicates with the tip end side of the chip suction space 22 through the gap 25 is formed between the suction portion 13 and the inner peripheral surface. further,
A compressed air supply hole 29 is formed in the peripheral portion of the chip suction portion 13 so as to communicate with the compressed air ejection space 28, and the supply hole 29 serves as a compressed air supply means such as an air compressor (not shown). The compressed air supply means, the supply hole 29, and the intermediate member 2 are connected to an air supply pipe.
4, the compressed air ejection space 28, and the gap 25,
The chip suction means 15 in this embodiment is configured.
The inner peripheral edge of the distal end of the intermediate member 24 is formed in a multi-step taper surface shape toward the inner peripheral side toward the base end side in the axis O direction.

In order to perform grooving or shoulder milling on the workpiece W by the end mill 1 while using the chip suction device 11 having such a configuration, first, the form of processing and the cutting by the cutting edge portion 5 of the end mill 1 are performed. An appropriate chip guide plate 14 is selected according to the depth D and the cutting width L, and is attached to the tip of the chip suction unit 13. Thereafter, the compressed air supply means of the chip suction means 15 and the chip collecting means connected to the chip discharge passage 21 of the chip storage portion 12 are operated, and the end mill 1 is rotated in the tool rotation direction T as described above. While feeding in the feeding direction F, the work material W is cut as shown in FIG. 3 or 4. Here, when the compressed air supply means and the chip recovery means are operated, the compressed air supplied from the compressed air supply means flows from the supply hole 29 into the compressed air ejection space 28 and is ejected along the concave groove portions 26, 27. While circulating in the space 28, it flows out to the tip side thereof and is ejected from the gap 25 into the chip suction space 22. Since the compressed air ejection space 28 is formed in a multi-stepped shape by the concave groove portions 26, 27, while the air passes through the ejection space 28, the air receives a pumping effect to increase its flow velocity, and the air flows from the gap 25. It will be ejected at high speed into the chip suction space 22.

On the other hand, in the chip storage space 19 communicating with the base end side of the chip suction space 22, the chip storage space 19 is operated by operating the dust collecting device of the chip collecting means.
The air in the inside is sucked out from the chip discharge passage 21, and therefore the air jetted from the gap 25 is the chip suction space 2
While flowing in 2 toward the base end side, the flow velocity thereof is increased to reach the chip storage space 19, where an air flow is formed from the tip of the chip suction space 22 toward the base end side. Therefore, a negative pressure is generated near the tip opening 23 of the chip suction unit 13. Further, on the tip side of the chip suction portion 13, the chip guide plate 14 is inserted into the groove G or the concave wall portion H formed by the cutting blade portion 5 of the end mill 1, whereby the inside of the groove G or In the concave wall portion H, the chip guide plate 14 and the wall surface K of the groove G or the wall surface K of the concave wall surface H are formed.
A space S communicating with the chip suction space 22 is defined around the cutting edge portion 5 by the side surface P of the work material.

Therefore, the chips C generated by the outer peripheral cutting edge 4A and the tip cutting edge 4B of the cutting edge portion 5 do not scatter from the space S to the surroundings, and the chips C are guided by the chip guide plate 14.
And is guided toward the tip opening 23 side of the chip suction portion 13. Here, since the tip end opening 23 of the chip suction unit 13 has a negative pressure as described above, the chips guided therein are sucked into the chip suction space 22 and further into the chip suction space 22. The formed air flow toward the base end side is sent to the chip storage space 19. On the other hand, due to the space S defined around the cutting edge portion 5 of the end mill 1, the chip suction space 22 surrounds the cutting edge portion 5.
Only the base end side communicating with is opened and the other direction is in a substantially closed state. As a result, the suction force due to the negative pressure generated in the tip opening portion 23 of the chip suction portion 13 acts on the entire space S, so that the chips C generated at the tip of the cutting blade portion 5 also quickly move to the base end side. It is guided and sent out into the chip storage space 19 through the chip suction space 22. Then, the chips C thus stored in the chip storage space 19 are discharged from the chip discharge passage 21 by the collecting means, collected, and collectively processed.

As described above, the chip disposal device 11 having the above-mentioned configuration
According to this, the chips C generated in the groove processing and the shoulder milling processing by the end mill 1 can be efficiently sucked and collected, and such chips C scatter around and hinder the processing. Can be prevented. This makes it possible to improve the environment at the processing site and perform safe and smooth end mill processing. Also,
As described above, the suction force of the chip suction means 15 causes the wall surface K of the chip guide plate 14 and the groove G, the wall surface K of the concave wall portion H, and the work material W.
Since it acts on the entire space S defined by the side surface P and the side surface P, the chips C generated on the tip side of the cutting blade portion 5 can be evenly and surely sucked. Therefore, it is possible to prevent the situation where the chips C are accumulated in the space S and the chips are clogged, and smoother machining can be performed. This has a remarkable effect especially when the cutting depth D by the cutting edge portion 5 of the end mill 1 is relatively large.

Further, in the present embodiment, the chip guide plate 14 is detachable and can be appropriately exchanged according to the processing form and the size of the end mill so that the chip guide plate 14 can be used for both grooving and shoulder milling and can be used for the end mill 1 having various sizes. It is possible to provide a highly versatile chip suction device 11 which can also be applied. Further, the chips C are guided by the chip guide plate 14 and guided to the chip suction space 22 while jumping in the space S as the end mill 1 rotates.
Is most susceptible to damage, but by making the chip guide plate 14 replaceable in this way, even if it is significantly damaged, it is possible to replace only the chip guide plate 14 and continue processing, which is more economical. is there. In this embodiment, the width and length of the chip guide plate 14 can be adjusted by exchanging the chip guide plate in this way. For example, the chip guide plate 14 is composed of a plurality of circular arc plates divided in the circumferential direction, These arc plates may be overlapped or widened to adjust the width in the circumferential direction. Further, the chip guide plate may be freely retractable from the tip of the chip suction portion and its length in the direction of the axis O may be adjusted.

[0017]

As described above, according to the present invention, even in the grooving and the shoulder milling by the end mill, the generated chips can be evenly and surely sucked and collectively processed. As a result, it is possible to prevent chips from scattering around, to provide a hygienic and safe working environment, and it is possible to perform smooth processing. Further, since the suction force can be applied to the tip of the cutting edge portion of the end mill by the chip guide plate, the chips can be reliably sucked even when the cutting depth is large.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged side view around the chip suction unit 13 of the embodiment shown in FIG.

FIG. 3 is a cross-sectional view taken along line XX in FIG. 1 when performing groove processing. However, the cutting edge portion 5 of the end mill 1 is simplified.

FIG. 4 is a cross-sectional view taken along line XX in FIG. 1 when shoulder milling is performed. However, the cutting edge portion 5 of the end mill 1 is simplified.

[Explanation of symbols]

 1 End Mill 5 Cutting Blade Part 7 Spindle Head 8 Spindle 11 Suction Device 12 Chip Storage Part 13 Chip Suction Part 14 Chip Guide Plate 15 Chip Suction Means 19 Chip Storage Space 21 Chip Discharge Path 22 Chip Suction Space 24 Intermediate Member 25 Gap 28 Compressed Air Jet space 29 Compressed air supply hole O Rotation axis of end mill 1 Tool rotation direction F Tool feed direction D Cutting depth L Cutting width W Work material G Groove H Concave wall C Chip

Claims (3)

[Claims] 1. A cylinder which is provided so as to surround the periphery of a portion of the end mill which is rotated around an axis and which is closer to the base end side than the cutting edge portion, and which defines a chip suction space between the outer peripheral surface of the end mill. -Shaped chip suction part, a chip storage part that is provided on the base end side of the chip suction part and defines a chip storage space that communicates with the chip suction space, and a tip end side in the chip suction space from its tip end side. Chip suction means for forming a flow of air toward the chip suction part to generate a negative pressure in the vicinity of the tip opening part of the chip suction part, and a cutting edge of the end mill projecting from the opening part at the periphery of the tip opening part of the chip suction part. A chip suction device in end mill processing, comprising: an arc-shaped plate-shaped chip guide plate provided so as to partially surround the periphery of the blade portion. 2. The chip suction device in end mill machining according to claim 1, wherein at least one of a circumferential width and an axial length of the chip guide plate is adjustable. 3. The chip suction means is a compressed air supply means for supplying compressed air to the chip suction portion and ejecting the compressed air from the tip peripheral portion of the chip suction space to the base end side. A chip suction device in the end mill processing according to claim 1 or 2.