JP3299490B2 - Superabrasive blade and method of manufacturing the same - 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 grinding and cutting 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. Further, for example, Japanese Utility Model No. 2-7015 has been proposed in order to prevent the generation of noise during the cutting operation.

In this proposal, a plurality of steel plates are overlapped and spot-welded to form a composite base having a gap, and 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 is intended to stably and easily manufacture a blade having a high noise prevention effect, and has the following features. The first feature is that the base metal is formed by laminating a plurality of discs, and a separating material made of carbon powder is applied to the mating surface of the discs to be laminated and formed on the outer peripheral edge of the disc. Also, when sintering a superabrasive layer, the entire area between the mating surfaces of the disks is not integrated by fusion, diffusion, or the like.

A second feature is that, after sintering of the superabrasive layer, spots are welded between a plurality of discs at a predetermined point. The two sheets have a convex shape protruding and deforming outward from the plate surface at the center of the disk. This convex shape forms a gap in the composite base metal to which the disks are joined, and a contact portion at a boundary portion between the gaps. The contact portion is a portion that can be slid by the vibration of the disk, and the vibration energy is attenuated by thermal energy due to friction caused by the sliding. We recognized this effect as clonal decay. According to this recognition, if the plate surface has a concave or convex shape, the contact portion can be formed, and thus the shape and the number of the unevenness are not limited.

[0007] The third feature is that, in the portion having the above-mentioned void portion,
Providing an axial through-hole to reduce the vibration conduction area of the base metal, prevent resonance due to the presence of voids, and further promote Coulomb damping (friction damping) by assisting sliding between the plates. It is.

A fourth feature is that the superabrasive layer provided on the outer peripheral edge of the base metal is provided on the outer peripheral edge of the segment between a plurality of cutouts provided on the outer peripheral portion of the base metal in the radial direction or inclined with respect to the radial direction. It is to form. Other features of the present invention will be described in more detail by way of examples.

[0009]

1A and 1B are a front view of an embodiment blade and a schematic diagram of a II section thereof. 2A and B, FIG. 3A
1B and 1B are enlarged detailed views of parts a, b, c, and d in FIGS. 1A and 1B, respectively.

In FIG. 1A, reference numeral 1 denotes a base metal, and a superabrasive layer 2 is formed on a segment 4 between notches 3 on the outer peripheral edge thereof. Reference numeral 5 denotes a central shaft hole, and a star-shaped convex portion 6 is formed around the shaft hole 5. As can be understood from FIG. 2B, which is an enlarged detail view of part b, the base 1 has a central disc.
11, the discs 12 and 13 on both sides are formed by overlapping each other. 3A and 3B, which show details of the portion c and the portion of the disk 12 and 13 on the outer sides thereof, as shown in FIGS. Since the shape-processed portion 14 is provided, when overlapped and joined, the convex portion 6 is formed on the outer surface of the base metal 1, and the concave portion 16 on the convex back side is formed as the void portion 16 as it is.

Further, at the boundary between the gap 16 and the plate surface where there is no convex portion 14, a contact portion 17 which is slidable by contact between the two plate surfaces is provided.
As a result, a minute gap 18 at a portion away from the boundary is formed. The minute gap is easily generated by performing a drawing process for forming the convex processed portion 14. Reference numeral 7 denotes a spot-welded portion where spot welding is performed between the disks. In the embodiment, an intermediate portion between the convex portion 6 and the shaft hole 5, that is, a concentric non-processed portion 15 around the shaft hole 5,
It is provided on the portion of the outer peripheral cutout 3 where there is no protrusion 6 around the root. Reference numeral 8 denotes an axial through hole that penetrates the gap 16.

The blade having this configuration is manufactured as follows. Prepare copper-plated steel disks 11, 12, and 13 with a thickness of 0.5mm. The center disk 11 has a diameter of 93.4 mm, and the disks 12 and 13 on both sides have a diameter of 91.4 mm. Is formed in advance. Also, on the overlapping surface of each disk,
Carbon powder was applied as a separating agent 9 except for the portion where the superabrasive layer was formed on the outer periphery of the disk.

On the outer periphery of the disks 11, 12, and 13, eight notches 3 are provided which are inclined from the radial direction and whose bottoms are located on the radial direction of the star-shaped bottom of the convex processing portion 14. You. A mixture of diamond grains and a metal powder of copper, tin, iron, etc. is surrounded and filled on the notch 3 on the outer periphery of the overlap and the segment 4 between the notch 3 and is heated and sintered at about 700 ° C. to form a superabrasive layer. Form 2

FIG. 2B is an enlarged view showing a state in which the superabrasive grain layer 2 surrounds and fixes the base metal 1. The center disk 11 forming the base metal 1 has a large diameter, and the disks 12, Since 13 has a small diameter, the superimposed outer peripheral surface is surrounded by a mixture, and when heated and pressed in a furnace, the mixture is sintered to form the superabrasive layer 2 and each disk The outer peripheral portion is easily fixed to one body. By this heating, the inner peripheral part between each disk surface is also directly or copper,
Attempts are made to fix via copper alloy plating, but since there is a spacing material 9 coated with carbon powder, this portion is prevented from sticking as it is in contact.

After forming the superabrasive layer 2, it is taken out of the furnace,
In order to strengthen the joint between the discs and process the discs to increase the Coulomb damping phenomenon described later, the periphery of the shaft hole 5 and the notch 3
A number of spot welds 7 are applied around the root of the steel. Super abrasive layer 2
The blade thickness is 2.0mm and the outer diameter of the blade is 105mm.

In order to prevent the gap 16 from being hermetically sealed by the projection 6, an axial through-hole 8 having a diameter of 5 mm is formed in this portion. This processing has a favorable effect on the strength and stiffness of the base metal 1 together with the spot welding. The gap width of the gap 16 is about 0.15 mm
It is.

Using the blades of the above embodiment and the conventional product or the comparative example, the concrete sidewalk road boundary block is cut by 30 cm.
Table 1 shows the results of measuring the noise at a position of 1 m.

[0018]

[Table 1]

As can be understood from Table 1, the embodiment shown in FIG. 1 has the lowest noise. This is because the vibration of the superabrasive layer generated at the time of cutting is transmitted to the base metal 1. The base metal 1 is formed by stacking a plurality of disks, and the disks are formed in a gap portion.
16 and a contact portion 17 formed at a boundary portion in contact with the gap portion 16 in the non-drawn portion, and a contact portion that may also occur between the plate surfaces around the spot weld 7 cause slippage during vibration. ,
This is considered to cause so-called Coulomb damping in which vibration energy is converted into heat energy by friction.

Since the Coulomb damping is considered to be proportional to the applied pressure of the contact portion, the spot welding 7 is an effective means, and the reason why the first embodiment is superior to the second embodiment is considered to be that. . The gap 16 is necessary for the generation of the contact portion, and is effective in dispersing the vibration together with the notch 3, but has the disadvantage of resonating in a closed state. It is preferable to prevent this. Further, the effect of reducing the resonance transmission area of the base metal and the sliding between the disks by the through holes 8 can be expected to further exert the effect of the Coulomb damping.

Although the number of disks is three in the embodiment, the number of disks may be changed to two or more if necessary, and the respective materials may be different. Needless to say, the position, shape, and number of notches, protrusions, and spot welds can be changed.

[0022]

As described above, according to the present invention, a plurality of discs each having a carbon powder applied to the mating surface are superimposed on each other, and a superabrasive layer on the outer periphery is formed by sintering. The discs are joined so that the other disc portions are not fixed by the carbon powder. The application of the carbon powder is easy, and naturally, the thickness of the powder is extremely small, so that there is no problem in designing the thickness of the base metal, the spot welding is easy, and the noise prevention effect is high. Further, by providing a convex portion or a missing portion, an effect such as smooth cutting and good discharge of cutting chips can be expected.

[Brief description of the drawings]

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

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.

[Explanation of symbols]

Reference Signs List 1 base metal 2 superabrasive layer 3 notch 4 segment 5 shaft hole 6 convex portion 7 point welding 8 through hole 9 spacing material 11 center disk
12, 13 Disks on both sides 14 Convex 15 Concentric unprocessed part 16 Concave void 17
Abutment part 18 minute gap a peripheral part of notch b fixed part of superabrasive layer c, d boundary between convex and concave

──────────────────────────────────────────────────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-4-118133 (JP, A) JP-A-63-272467 (JP, A) JP-A-59-128358 ( JP, U) Japanese Utility Model 63-1650 (JP, U) Japanese Utility Model 58-70869 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24D 5/12 B24D 5/00 B24D 3/00 310 B28D 1/24

Claims (7)

(57) [Claims] 1. A plurality of disks comprising: a base metal formed by a plurality of disks overlapped and joined via a separating material; and a superabrasive layer formed on an outer peripheral edge of the base metal. The joint of
A superabrasive blade characterized in that it is performed by spot welding between discs and sintering of a superabrasive layer, and wherein the spacing material is formed using carbon powder. 2. At least one of the discs to be superimposed has a deformed irregular shape on the plate surface, and a gap between the disc and the plate surface is slidable at a portion where the disc is in contact with another disc. The blade according to claim 1, wherein the blade is formed with a contact portion. 3. The blade according to claim 1, wherein an axial through hole is provided in a portion of the base metal having a gap. 4. An outer peripheral edge of a base metal is provided with a number of notches, and a superabrasive layer is formed on an outer peripheral edge of a segment between the notches. The described blade. 5. A plurality of discs and / or a separating material made of carbon powder is adhered and superimposed on a surface of the discs having irregularities on the plate surface, and superposed on an outer peripheral edge of the superimposed discs. A method of manufacturing a superabrasive blade, comprising: filling a mixture of abrasive grains and metal powder, sintering the mixture to form a superabrasive layer, and joining a superposed disk. 6. The manufacturing method according to claim 5, wherein a plurality of spot weldings are performed between the disks overlapped and joined by sintering. 7. The manufacturing method according to claim 5, wherein a through-hole in the axial direction is formed in a void formed by providing the unevenness on the surface of the disk.