JP2649019B2 - Super abrasive blade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade having a superabrasive layer made of diamond, CBN (cubic boron nitride) or the like used for cutting and grinding stones, concrete and other various members.

[0002]

2. Description of the Related Art As a blade of this type, a steel disk having a superabrasive layer formed on an outer peripheral edge thereof is well known.

[0003]

In such a blade, many improvements have been made to improve the grinding performance, the machined surface, and the life of the blade. Also, for example, Japanese Utility Model No. 2-7015 has been proposed in order to prevent the generation of noise during the cutting operation.

[0004] In this proposal, a plurality of steel plates are overlapped and spot-welded to form a composite base having a gap. Vibration is attenuated by viscous resistance caused by air movement caused by the minute gap, thereby preventing generation of noise. What you want to do.
Although the noise is lower than that of a single piece of metal, it is difficult to adjust the position and size of the gap, and it is not necessarily sufficient in terms of performance and manufacturing.

[0005]

SUMMARY OF THE INVENTION The present invention aims to provide a blade having a structure capable of stably preventing noise, and has the following features. At least one of a plurality of discs which are overlapped and joined to form a base metal is provided with a deformed uneven shape on a plate surface, and a gap and a plate are formed in a portion where the disc is in contact with another disc. That is, a contact portion slidable between the surfaces is formed. The contact portion slides due to vibration during use of the blade, and the vibration energy is converted into heat energy by friction caused by the sliding. Therefore, the vibration is rapidly attenuated, and noise due to the vibration is prevented. The inventors have recognized this effect as Coulomb decay.

Another feature of the present invention is that an axial through hole is provided in the space to prevent resonance due to the space and reduce the vibration area of the base metal. Still another feature of the present invention is that the superabrasive layer is formed on the outer peripheral edge of the segment between a number of cutouts provided to be inclined with respect to the radial direction of the outer periphery of the base metal. Hereinafter, the contents will be described with reference to embodiments.

[0007]

1A and 1B are a front view of an embodiment blade and a sectional view taken along line II of the blade. 2A and B, 3A and B
3 is an enlarged explanatory view of each part of a, b, c, d in FIG.

In FIG. 1A, reference numeral 1 denotes a base metal, and a superabrasive layer 2 is fixed on the segment 4 between the notches 3 on the outer peripheral edge thereof. Reference numeral 5 denotes a central shaft hole, and a windmill-shaped convex portion 6 is formed around the shaft hole 5. As can be understood from the enlarged views of FIGS. 2 and 3, the base metal 1 is formed by superimposing a central disc 11 and discs 12 and 13 on both sides, respectively. A windmill-shaped convex shape 14 is formed in advance in the center of the outer disks 12, 13 (around the shaft hole 5) toward the outside of the plate surface. The inner side (back side) of the convex 14 is a concave 15.

Therefore, if these discs 12 and 13 are overlapped and joined to the center disc 11, the recess 15 becomes a gap. Further, as shown in FIG. 3 in an enlarged manner, the boundary between the gap 15 and a non-convex portion where no gap is intentionally formed is a disc.
The contact portions 12, 11, and 13 come into contact with each other to form a contact portion 10, and the other portion from the contact portion becomes a very small minute gap 9.

The contact portion 10 serves as a slidable surface, and slides by vibration generated when the blade is used, and the vibration energy is converted into frictional heat energy by the sliding. Therefore,
Noise due to vibrations during blade cutting is significantly attenuated. The present inventors have recognized this effect as Coulomb attenuation, and have shown FIGS. 4A and 4B as a configuration that can exhibit this effect more, that is, a structure that can clearly form and adjust the contact portion.
It will be described later.

In FIG. 1, reference numeral 7 denotes a spot welding spot where spot welding is performed between the disks. In the embodiment, the protrusions 6 are provided on the non-working surface provided concentrically on the shaft hole 5 side and on the root of the notch 3. Reference numeral 8 denotes an axial through hole penetrating the gap 15.

In FIG. 4, A is a plan view, and B is an enlarged cross section taken along the line I--I. Only parts different from the embodiment of FIG. 1 will be described. Concentric circles 2 correspond to the protrusions 6 in FIG.
Three convex portions 66 and 67 are provided. Therefore, the contact portion 10 is clearly formed between the two convex portions 66 and 67, and the Coulomb damping effect is remarkable. However, with this structure, there is a possibility that the strength of the base metal may be impaired depending on the dimensional ratio. Conversely, the structure of FIG. Of course, the concentric projection 66 may be provided with the through hole 8 as well.

The concentric convex portion shown in FIG. 4 may be meandered if necessary to form more abutting portions, and the star 11 shown in FIG. Or a discontinuous concave or convex portion.

In the blade having this configuration, a super-abrasive grain layer sintered in advance is fixed to the outer edge of the segment 4 on the outer periphery of the base metal 1 by brazing or the like. When surrounding and filling the mixture of the metal powders and sintering the same, the disks forming the base metal 1 may be simultaneously joined. In this case, it is necessary to attach a separating material such as carbon or ceramic between the discs in order to prevent unification by welding or diffusion of the plating material between the discs.

FIG. 2B is an enlarged view showing a state in which the superabrasive layer 2 surrounds and fixes the base metal 1. If the center disk 11 has a large diameter as shown in FIG. . In the case of brazing, it is preferable to have the same diameter and to perform V-groove processing on the outer edge.

In the embodiment, each of the discs 11, 12, and 13 is formed of eight segments using a rolled material having a thickness of 0.5 mm. The blade thickness of the superabrasive layer 2 was 2.0 mm, and the diameter of the blade was 105 mm. Base metal 1 has a depth of 0.15 on disks 12 and 13.
Since a windmill-shaped convex drawing process with a diameter of 73 mm and an outer diameter of 73 mm is performed, and a spot weld 7 and a through hole 8 are further added, the strength is high and a squatting effect can be expected. This processing also contributes to the noise reduction shown in Table 1. The inclination of the notch 3 is also effective for smooth cutting. The size of the diamond grains forming the superabrasive layer is 40 to 50 mesh, and the outlet is 15 mesh.
And

[0017]

[Table 1]

The above-mentioned noise was measured by cutting the boundary block of the concrete sidewalk by 30 cm with the blades of the embodiment, the comparative example and the conventional example, and measuring the noise generated at that time at a position of 1 m.

The reason why the noise of the embodiment is low is that the vibration of the superabrasive layer 2 generated at the time of cutting is transmitted to the base metal 1, but the base metal 1 is formed by stacking a plurality of disks, and Is formed, so that the contact portion slides due to vibration, and so-called Coulomb damping, which converts vibration energy into heat energy by friction, occurs.

The abutting portions are concentric convex portions 66,
Between 67, not only the boundary part with the windmill-shaped convex part 6, but also the notch part 3 and the spot welding 7 arrange | positioned in the position of the relationship with both can be expected, and this thing is substantially It is thought that Coulomb damping appeared most effectively because it was systematically distributed within.

In the embodiment, the number of disks is three, but if necessary, two or more disks may be used.
Discs having different materials and thicknesses can be used. Also, the shape, position,
The number is most preferably as shown in the figure, but can be changed as appropriate depending on the partner material to be cut or the diameter of the blade.

[0022]

As described above, the blade having the structure of the present invention has a great effect of reducing noise at the time of cutting. It is expected that the cut portion is smooth, and the effect of promoting the discharge of the swarf can be expected from the convex portion of the windmill shape and the missing portion inclined with respect to the radius square. In addition, a product having a uniform strength and sufficient strength can be easily manufactured.

[Brief description of the drawings]

FIG. 1A is a front view of an embodiment, and FIG. 1B is a sectional view taken along line II of A.

FIGS. 2A and 2B are enlarged views of portions a and b in FIG. 1, respectively.

3A and 3B are enlarged views of a portion c and a portion d in FIG. 1, respectively.

FIG. 4A is a plan view of another embodiment, and FIG. 4B is an enlarged sectional view taken along the line II of FIG.

[Explanation of symbols]

 Reference Signs List 1 base metal 2 superabrasive layer 3 notch 4 segment 5 shaft hole 6 convex part 7 point welding 8 through hole 9 minute gap 10 contact part 11 center disk 12, 13 disk on both sides 14 convex 15 concave part, Void 66, 67 Concentric convex part a Peripheral part of notch part b Adhesion part of superabrasive layer c, d Boundary part with convex part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuo Urakawa 2-80 Hokita-cho, Sakai-shi, Osaka Osaka Dai Inside the Diamond Industries Co., Ltd. (72) Inventor Tsutomu Takubo 2-80 Horikita-cho, Sakai-shi, Osaka Osaka Die (56) References JP-A-4-115874 (JP, A) JP-A-63-1650 (JP, U) JP-A-2-7015 (JP, Y2)

Claims (4)

(57) [Claims] 1. A disk-shaped base metal provided with a superabrasive grain layer on an outer peripheral edge thereof, wherein the base metal is formed by a plurality of superimposed disks formed by spot welding and fixation of the superabrasive grain layer. At least one of the disks has a deformed uneven shape on the plate surface, and the disk has a contact portion slidable between the gap and the plate surface at a portion in contact with another disk. Characterized by super abrasive blades. 2. The deformed circular plate is located outside, and the concave and convex shape is a convex shape protruding outside the plate surface, a void is formed by a concave portion inside the convex shape, and a boundary portion of a non-recess portion around the void. The blade according to claim 1, wherein the blade forms a contact portion. 3. The blade according to claim 1, wherein an axial through hole is provided in the gap. 4. An outer peripheral edge of a base metal is provided with a number of notches inclined with respect to a radial direction of the base metal, and a superabrasive layer is provided on an outer peripheral edge of a segment between the notches. The blade according to claim 1, 2, or 3.