JP2003001555A - Super finishing grinding stone holder and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a super finishing grinding stone holder which is manufactured by a simple process and for a low cost, and has a more accurate square hole part for attachment of the grinding stone than a conventional one. SOLUTION: In the holder body 11 a diamond coated square groove part 17 is provided, and on the holding plate 21 a diamond coated flat part 26 is provided. The holder body 11 and the holding part 21 are assembled together into one unit so that the square groove part 17 and the flat part 26 are adjoined to face each other to form the square hole for attachment of the grinding stone. Or, the holder body 11 may be provided with a stepped part and the holding part 21 may be provided with a L shape hooked part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone holder for superfinishing, which can be finished with high dimensional accuracy and has a long life, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Superfinishing is a working method in which a grindstone with a relatively small grain size is pressed against the surface of a work piece with a low pressure to give a lateral vibration to finish the surface. It is possible to obtain a good finished surface that has no directionality and has very few work-affected layers. As a grindstone holder used when performing such a super-finishing process, for example, FIG.
In general, the shape of 4 is provided, and a square hole portion 1 for mounting a grindstone is provided at the tip of this grindstone holder. However, the grindstone attached to the square hole portion 1 has an amplitude of 1 to 4 mm and a vibration frequency of 500 to 2000 during processing.
Since a minute vibration of about c / min is repeatedly applied, friction is generated between the surface of the grindstone and the inner surface of the square hole 1, and the inner surface of the square hole 1 is worn and rattling of the mounted grindstone occurs. Will gradually increase and the finishing accuracy will decrease. In order to prevent such abrasion of the inner surface of the square hole portion 1 due to minute vibration, a diamond sintered body (hereinafter referred to as PCD) has been conventionally used as a material for forming the square hole portion 1.
In manufacturing a grindstone holder having a square hole portion 1 made of PCD, for example, as shown in FIG. 16, a processing material 4 in which a PCD layer 3 is laminated on a substrate 2 made of cemented carbide as shown in FIG. The rectangular parallelepiped 5 having a different shape is cut out by electrical discharge machining using a wire cutting machine. Then, the rectangular parallelepiped 5 cut out is brazed to the body 6 of the grindstone holder separately manufactured as shown in FIG. 17 to be integrated, and the square hole portion 1 is formed in the PCD layer 3 by a wire cutting machine. Then, the square hole portion 1 is further ground to a final shape,
It was used as a grindstone holder as shown in.

However, in the conventional method of manufacturing a grindstone holder as described above, a step of cutting a rectangular parallelepiped 5 from a processing material 4 having a PCD layer, a step of manufacturing a holder body 6, and a brazing surface on the holder body 6 are formed. A step of performing a counterbore process to do so, a step of brazing the rectangular parallelepiped 5 and the holder body 6, a step of wire-cutting the square hole portion 1, and a step of finishing the square hole portion after brazing with precision. However, there is a problem in that a large number of steps are required and the manufacturing cost is significantly increased. Further, since the square hole portion 1 is formed by electrical discharge machining or the like, there is a limit to improvement in dimensional accuracy, and an error of about 15 μm occurs. Further, depending on the shape of the grindstone holder, it is difficult to obtain the brazing accuracy of the rectangular parallelepiped 5 forming the square hole portion 1 to the holder body 6, and the dimensional accuracy of the grindstone holder after brazing varies. There was a problem.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, has a simple manufacturing process and is inexpensive, and has a square hole portion for mounting a grindstone having a higher dimensional accuracy than the conventional one. The present invention has been made to provide a grindstone holder for superfinishing and a manufacturing method thereof.

[0005]

In order to solve the above-mentioned problems, the grinding wheel holder for superfinishing according to the present invention has a diamond coating on the inner surface between the holder body and the holding plate attached to the holder body. It is characterized in that the formed square hole portion is formed. It should be noted that one of the holder body and the pressing plate can be provided with a diamond-coated square groove portion, and the other can be provided with a diamond-coated flat portion that abuts against the square groove portion. A diamond-coated stepped portion can be provided on one side, and a diamond-coated L-shaped hook-shaped portion abutted on the stepped portion can be provided on the other side. Furthermore, the pressing plate can be slid and can be integrally assembled with the holder body.

Further, the method for manufacturing a grindstone holder for superfinishing according to the present invention comprises a step of providing a square groove portion or a step portion on one of the holder body and the pressing plate, and a flat portion abutting on the square groove portion on the other side. Alternatively, a step of providing an L-shaped hook-shaped portion to be brought into contact with the step portion, a step of applying diamond coating to the square groove portion and the flat portion or the step portion and the hook-shaped portion, and a fastener for fastening the holder body and the pressing plate And a process of assembling them together.

In the grindstone holder for superfinishing of the present invention, a square hole portion whose inner surface is diamond-coated is formed between the holder body and the pressing plate attached to the holder body, thereby easily and highly accurately. Square holes can be formed. That is, the square hole portion is formed by a square groove portion provided on one of the holder body or the pressing member and a flat portion provided on the other, or a step portion formed by the square groove portion on one of the holder body and the pressing member. And the L-shaped hook-shaped portion provided on the other side,
The process for forming the square hole portion is facilitated, and the grindstone holder for superfinishing having the square hole portion with high dimensional accuracy can be manufactured.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. 1-5 is a figure which shows 1st Embodiment of the grindstone holder of this invention. Here, FIGS. 1 and 2 are views showing a holder main body 11. The holder main body 11 has a base portion 12 on one side of which a square bar-shaped branch portion 13 extends, and the branch portion 13 has bolts and screws. Holes 14 and 15 for mounting fasteners such as pins and pins are provided, and a rectangular groove 17 cut into a concave shape is formed at the tip of the branch 13. Since one side of the square groove portion 17 is open, it is easy to form a groove, and therefore high dimensional accuracy can be obtained. Also, FIGS.
FIG. 4 is a view showing a pressing plate 21, and this pressing plate 21 also has a branch portion 23 extending from a base portion 22.
Also, holes 24 and 25 for mounting fasteners such as bolts, screws and pins are provided, and a flat portion 26 (shaded portion in the figure) finished to be flat is provided at the tip thereof. Has been formed. Since there are no obstacles in the flat portion 26 during processing, flatness, surface roughness, etc. can be formed with high accuracy. Then, the inner surface of the square groove portion 17 of the holder body 11 and the flat portion 26 of the pressing plate 21 are coated with diamond, and the square groove portion 17 and the flat portion 26 are opposed to and abutted to each other as shown in FIG. By combining the pressing plate 21 and the pressing plate 21 and fastening them with a fastener to be integrated, a grindstone holder having a square hole portion 1 with high dimensional accuracy can be obtained. Note that the square groove portion 17 may be provided on the pressing plate 21 and the flat portion 26 may be provided on the holder body 11 without being limited to the above-described embodiment.

FIGS. 6 to 10 are views showing a second embodiment of the grindstone holder of the present invention. In this embodiment,
As shown in FIGS. 6 and 7, the holder body 11 has a square groove portion 17
In place of the flat portion 26, the pressing plate 21 is provided with an L-shaped hook-shaped portion 27 instead of the flat portion 26, as shown in FIGS. Since the step portion 18 and the L-shaped hook-shaped portion 27 are formed by two planes intersecting at a right angle, they are much easier to machine than the holes surrounded by the four sides, and therefore have a high dimension. The step portion 18 or the hook-shaped portion 27 can be formed with high accuracy. Then, by coating the inner surface of the step portion 18 and the inner surface of the hook-shaped portion 27 with diamond, the two are opposed to each other and brought into contact with each other, and the two holder members 11 and 21 are integrated by a fastener, as shown in FIG. As shown in, the square hole portion 1 with high dimensional accuracy can be easily provided in the grindstone holder. It goes without saying that the stepped portion 18 can be provided on the pressing plate 21 and the hook-shaped portion 27 can be provided on the holder body 11 without being caught by the above-described embodiment.

11 to 13 are views showing a third embodiment of the grindstone holder of the present invention. As shown in FIG. 11, a plurality of screw holes 19 and 19 are provided on the side surface of the holder body 11. A step portion 18 (hatched portion in the figure) is provided at the tip to apply diamond coating. On the other hand, as shown in FIG. 12, an insertion hole 28 for an elongated screw component is provided on the side surface of the pressing plate 21, and the tip is bent to provide a hook-shaped portion 27 (hatched portion in the figure), and a diamond is formed on the inner surface thereof. Apply coating. Then, the pressing plate 21 is attached to the holder body 11
Further, as shown in FIG. 13, the whetstone holder having the square hole portion 1 can be obtained by screwing with a screw component such as a bolt or a screw. Since the pressing plate 21 is slidably mounted on the holder body 11, there is an advantage that the length of the square hole 1 can be adjusted according to the width of the grindstone to be mounted.

In any of the above-mentioned cases, the diamond coating can be performed by vapor deposition, but the coating method is not limited to this. In addition, the thickness of the diamond layer to be coated is preferably thicker than the maximum wear amount allowed for the square hole 1. Further, it is necessary that the dimensions of the square groove portion 1, the step portion 18, and the hook portion 27 are formed to be as large as the thickness of the diamond layer to be coated.

Hereinafter, the grindstone holder for superfinishing of the present invention will be described in more detail with reference to Examples. [Example 1] A holder body 11 having a shape as shown in Figs. 1 and 2 was made of cemented carbide, and the inner surface of the square groove portion 17 was diamond-coated. The thickness of diamond is 10μ
m. On the other hand, a pressing plate 21 having a shape as shown in FIGS.
Was diamond coated. The thickness of diamond was 10 μm. Next, these holder bodies 11
The pressing plate 21 and the pressing plate 21 were combined as shown in FIG. 5 and then fastened with a fastener to obtain a grindstone holder for superfinishing having the square hole 1. As a result, the dimensional error of the square hole portion 1 could be reduced to 5 μm, which is 1/3 of the conventional one.

[Embodiment 2] A holder body 11 having a shape as shown in FIGS. 6 and 7 was made of cemented carbide, and the inner surface of the step portion 18 was diamond-coated to a thickness of 6 μm. On the other hand, a pressing plate 21 having a shape as shown in FIGS. 8 and 9 was made of cemented carbide, and the inner surface of the hook 27 was diamond-coated with a thickness of 6 μm. Next, the holder body 11 and the pressing plate 21 were combined as shown in FIG. 10 and then fastened with a fastener to obtain a grindstone holder for superfinishing having the square hole 1. As a result, the dimensional error of the square hole portion 1 could be reduced to 3 μm, which is ⅕ of the conventional one.

[Embodiment 3] A stepped portion 1 formed at the tip of a holder body 11 having the shape shown in FIG. 11 is made of cemented carbide.
8 was diamond-coated with a thickness of 6 μm.
On the other hand, a pressing plate 21 having the shape shown in FIG. 12 was made of cemented carbide, and a hook-shaped portion 27 formed at the tip was coated with a diamond coating having a thickness of 6 μm. Next, the holder body 11
The holding plate 21 was fastened with screw parts 29 as shown in FIG. 13 to form a grindstone holder for superfinishing having the combined square hole portion 1. As a result, as in Example 2, the dimensional error of the square hole portion 1 could be reduced to 3 μm, which is 1/5 of the conventional one.

[0015]

As described above, the grindstone holder for superfinishing of the present invention cuts out a rectangular parallelepiped from a processing material, counterbores the holder body, and has a rectangular parallelepiped shape, as in the case where the square hole portion is manufactured by PCD. Since many steps such as brazing to the holder body are unnecessary, the manufacturing cost of the grindstone holder can be reduced. In addition, since wire cutting of the processing material having the PCD layer, brazing of the cut rectangular parallelepiped, and drilling of square holes after brazing are not required, dimensional errors due to these processings do not occur. . Moreover, since the square groove portion, the flat portion, the step portion, or the hook portion can be integrally formed on the holder body or the pressing plate from the same material, the dimensional error of the square hole portion is reduced to 1/3 to 1 compared with the conventional method. We were able to greatly improve it to 1/5.
Furthermore, since the width of the square hole can be adjusted according to the width of the grindstone, there is also an advantage that a single holder can mount grindstones of different sizes.

[Brief description of drawings]

FIG. 1 is a front view of a holder body used in a grindstone holder according to a first embodiment.

FIG. 2 is a side view of the holder body of FIG.

FIG. 3 is a front view of a pressing plate used in the grindstone holder according to the first embodiment.

FIG. 4 is a side view of the pressing plate of FIG.

FIG. 5 is a perspective view of the grindstone holder according to the first embodiment.

FIG. 6 is a front view of a holder body used in the grindstone holder according to the second embodiment.

FIG. 7 is a side view of the holder body of FIG.

FIG. 8 is a front view of a pressing plate used in the grindstone holder according to the second embodiment.

9 is a side view of the pressing plate of FIG. 8. FIG.

FIG. 10 is a perspective view of a grindstone holder according to a second embodiment.

FIG. 11 is a perspective view of a holder main body used for a grindstone holder according to a third embodiment.

FIG. 12 is a perspective view of a pressing plate used in the grindstone holder according to the third embodiment.

FIG. 13 is a perspective view of a grindstone holder according to a third embodiment.

FIG. 14 is a perspective view of a conventional grindstone holder.

FIG. 15 is a perspective view of a processing material.

FIG. 16 is a perspective view of a rectangular parallelepiped that has been cut out.

FIG. 17 is a perspective view of a grindstone holder before brazing.

FIG. 18 is a perspective view of the grindstone holder after brazing.

[Explanation of symbols]

1 Square hole 2 substrates 3 PCD layer 4 Processing material 5 rectangular parallelepiped 6 Holder body 11 Holder body 12 base 13 branches 14 and 15 holes 17 Square groove 18 Step 19 screw holes 21 Press plate 22 base 23 branches 24, 25 holes 26 Flat part 27 Hook 28 insertion holes 29 screw parts

Claims (5)

[Claims] 1. A grindstone holder for superfinishing, characterized in that a square hole portion having an inner surface coated with diamond is formed between a holder body and a pressing plate attached to the holder body. 2. A diamond-coated square groove is provided on one of the holder body and the pressing plate,
The grindstone holder for superfinishing according to claim 1, wherein a diamond-coated flat portion that abuts the square groove portion is provided on the other side. 3. A step portion coated with diamond is provided on one of the holder body and the pressing plate, and
The grindstone holder for super-finishing according to claim 1, further comprising a diamond-coated L-shaped hook-shaped portion that abuts on the stepped portion. 4. The grindstone holder for superfinishing according to claim 3, wherein the pressing plate is made slidable and is integrally assembled to the holder body. 5. A step of providing a square groove portion or a step portion on one of the holder body and the pressing plate, and a flat portion abutting on the square groove portion on the other side, or an L-shaped hook shape abutting on the step portion. A step of providing a portion, a step of applying diamond coating to the square groove portion and the flat portion, or a step portion and a hook-shaped portion, and a step of fastening the holder body and the pressing plate with a fastener to assemble them integrally. A method for manufacturing a featured grindstone holder for superfinishing.