JP3534267B2 - Super finishing wheel and super finishing grinding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the surface to be ground of a work such as a pulley of a continuously variable transmission, a race of a radial bearing, or a hub wheel, which has a surface to be ground which has a circular arc-shaped cross section continuous in the circumferential direction. The present invention relates to a superfinishing grindstone and a superfinishing grinding method which are used when performing superfinishing grinding on the above.

[0002]

2. Description of the Related Art Conventionally, as the above-mentioned grindstone for superfinishing,
For example, there is one shown in FIG.

As shown in FIG. 5, this grindstone for superfinishing 10
Reference numeral 1 is made of ceramics and has a flat plate shape as a whole, and an arcuate grinding surface 101 is formed at the tip (left end in the figure).
a.

As shown in FIG. 6, the width of the arcuate grinding surface 101a of the superfinishing grindstone 101 has a circular arc-shaped cross section continuously provided in the circumferential direction of the work W1 rotating about the axis p1. The length of the chord connecting both ends of the ground surface W1a to be formed is set to be almost the same, and as shown by the phantom line in FIG.
The center of curvature o of the arcuate grinding surface 101a while pressing a
Oscillate about 1 (center of curvature o2 of the surface W1a to be ground),
The surface W1a to be ground is ground.

As another superfinishing grindstone of this superfinishing grindstone 101, for example, the durability of the grindstone is improved by covering the outer peripheral portion of the grinding surface with a grindstone different from the intermediate portion of the grinding surface. In addition to the above, there is one that is designed to prevent the shape of the grindstone from breaking (Shokai 59-140165).

[0006]

However, the conventional superfinishing grindstone 101 (or the actual development 59-140).
Applying the invention described in No. 165, the arc-shaped ground surface 10
In the case of a superfinishing grindstone in which the outer portion of 1a is covered with a grindstone different from ceramics), if there is a variation in accuracy in preprocessing of the superfinishing grinding process, for example, as shown in FIG.
As indicated by the solid line, the center of curvature o2 of the surface W1a to be ground of the workpiece W1 before superfinishing grinding and the center of curvature o3 that is the swing center of the superfinishing grindstone 101 during superfinishing grinding are in the radial direction. When the distance is a and the axial distance is b, the radius of curvature r1 of the grindstone for superfinishing 101 is r1.
And the radius of curvature r2 of the surface W1a to be ground are the same,
There is a problem that the superfinishing grindstone 101 may hit the surface W1a to be ground of the work W1 evenly to cause unprocessed residue, which may impair the quality.

Further, in order to prevent the above-described processing residue from occurring on the ground surface W1a of the workpiece W1, as shown in FIG. 7, the processing residue can be eliminated by processing the workpiece W1 to the position shown by the broken line in the drawing. In addition to requiring a great amount of time for the superfinishing grinding process, the abrasion amount of the grindstone is required up to the shaded portion in the drawing, which shortens the life of the grindstone and is economically unfavorable.

Further, the work surface W1 to be ground W1
The radius of curvature r2 of a and the radius of curvature r1 of the superfinishing grindstone 101 are both the radius of curvature r centered on the swing center o3.
3, the center of curvature of the surface W1a to be ground in the work W1 also moves by the radial distance a and the axial distance b as compared with that before the super-finish grinding, which causes a problem that the processing accuracy is deteriorated. Therefore, it has been a conventional problem to solve these problems.

[0009]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above-mentioned conventional problems, and can reduce the pre-processing accuracy of super-finish grinding, and the quality of super-finish grinding of the surface to be ground is impaired. It is an object of the present invention to provide a superfinishing grindstone and a superfinishing grinding method which can be performed in a short time without any need and which also realizes reduction of grinding cost.

A superfinishing grindstone according to claim 1 of the present invention is a superfinishing grindstone which has an arcuate grinding surface and swings in an arc direction of the arcuate grinding surface to grind a surface to be ground. , The elastic modulus of the grindstone central portion that constitutes the arc-direction central portion of the arc-shaped grinding surface is set to be smaller than the elastic modulus of the grindstone end portions that configure the arc-direction end portions of the arc-shaped grinding surface, and the grindstone central portion Is characterized in that it is configured to include a binder containing a resin, and the configuration of this superfinishing grindstone is a means for solving the above-mentioned conventional problems.

In a superfinishing grindstone according to a second aspect of the present invention, the grindstone center portion and the grindstone end portion are made of different grindstones.

In the grindstone for superfinishing according to claim 3 of the present invention, the grindstone end portion is provided with a binder containing any one of ceramics, metal and resin,
In the superfinishing grindstone according to the fourth aspect of the present invention, the grindstone end portions forming the arcuate end portions of the arcuate ground surface have different elastic moduli.

In the superfinishing grindstone according to the fifth aspect of the present invention, the grindstone central portion and the grindstone end portion are integrally formed of a resin-bonded grindstone material.

On the other hand, in the superfinishing grinding method according to claim 6 of the present invention, the superfinishing grindstone according to any one of claims 1 to 5 is provided continuously in the circumferential direction of the rotating work. When performing the grinding of the surface to be ground having a circular arc shape, the arc-shaped grinding surface of the superfinishing grindstone is pressed against the surface to be ground of the workpiece, and the protrusion amount of the superfinishing grindstone from the surface to be ground is concerned. It is characterized in that it is configured to oscillate the superfinishing whetstone in an arc direction by suppressing it to a range smaller than the arc direction width of the whetstone end portion in the superfinishing whetstone, and the configuration of this superfinishing grinding method is described above. This is a means for solving the conventional problems.

[0015]

Since the superfinishing grindstone according to claims 1 to 3 of the present invention has the above-mentioned configuration, it is continuous in the surface to be ground of the work before the superfinishing grinding process, for example, in the circumferential direction of the work. In the case where the center of curvature of the surface to be ground having an arcuate cross section and the center of curvature of the wobbling center of the superfinishing grindstone are displaced in the direction in which processing remains,
When the whetstone for super-finishing is rocked, the center of the whetstone with a small elastic modulus deforms and slides on the work surface with an arc-shaped cross section of the work piece. In addition, the super finishing grinding process is performed without increasing the abrasion amount of the grindstone and the removal amount of the work, and the super finishing grinding process time can be shortened and the grinding process cost can be reduced.

That is, even if the precision in the pre-finishing of the super-finishing grinding process varies, the super-finishing grinding process can be performed without affecting the quality, and therefore, before the super-finishing grinding process. The processing accuracy will be relaxed.

During this period, since the elastic modulus of the grindstone end portions forming the arcuate end portions of the arcuate ground surface is set to be higher than the elastic modulus of the grindstone end portion, superfinishing is performed by the edge portion of the work surface to be ground. The occurrence of a situation in which the grinding wheel is damaged will be avoided.

Further, in the superfinishing grindstone according to claim 4 of the present invention, for example, when performing superfinishing grinding of a surface to be ground having a large area where machining conditions are different from each other, a central portion of the grindstone and a grindstone end portion are processed. Not only have different elastic moduli, but also different elastic moduli between the grindstone ends, which means that the center of the grindstone and the grindstone end parts with different moduli of elasticity can be applied to parts with different processing conditions on the surface to be ground. Since these portions correspond to each other, uniform and efficient super finishing grinding is performed on the entire surface to be ground.

Further, since the superfinishing grindstone according to claim 5 of the present invention has the above-mentioned structure, the elastic modulus from one grindstone end to the other grindstone end changes continuously. In addition, since the elastic modulus is distributed according to the processing conditions of the surface to be ground during the manufacturing process, the workability of the work to the surface to be ground is improved.

Furthermore, since the superfinishing grinding method according to claim 6 of the present invention has the above-mentioned configuration, even if the superfinishing grindstone slightly protrudes from the surface to be ground during the superfinishing grinding process, the workpiece is not covered with the workpiece. Since no shoulder sagging occurs at the edge portion of the ground surface, the processing accuracy (contour accuracy) is improved.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a superfinishing grindstone according to claims 1 to 3 of the present invention.

As shown in FIG. 1A, the superfinishing stone 1 has a flat plate shape as a whole, and has an arc-shaped grinding surface 1a at its tip (left end in the drawing).

The grindstone 1 for superfinishing has an arc-shaped ground surface 1a.
The central portion 2 of the grindstone that constitutes the central portion in the arc direction and has a binder containing a resin and has an elastic modulus of about 2.06 × 10 ² MPa, and is integrally bonded to both sides of the central portion 2 of the grindstone. The grinding wheel end portions 3, 3 having the elastic modulus of about 3.8 × 10 ⁴ MPa, which constitute both ends of the arc-shaped ground surface 1a in the arc direction and which are provided with a binder containing ceramics, are provided. The joints between the grinding wheel central portion 2 and the grinding stone end portions 3, 3 on the surface 1a are formed without steps.

The grindstone 1 for superfinishing is mounted on a grindstone mount 5 for use.

In this superfinishing grindstone 1, an arcuate grinding surface 1
As shown in FIG. 1 (b), the width of a is a chord that connects both ends of the surface to be ground Wa that has a circular arc-shaped cross section and is continuously provided in the circumferential direction of the workpiece W rotating about the axis P1. The length of the grindstone 1 is set to be substantially the same as that of the superfinishing grindstone 1. As shown by the phantom line in the figure, the superfinishing grindstone 1 has an arcuate grinding surface 1a pressed against the grinding surface Wa of the workpiece W. 1a curvature center O
The surface to be ground Wa is ground by swinging about 1 (the center of curvature O2 of the surface to be ground Wa).

At this time, if there is a variation in accuracy in the pre-processing of the super finishing grinding, for example, as shown in FIG.
As indicated by the solid line, the center of curvature O2 of the surface to be ground Wa of the work W before superfinishing grinding and the center of curvature O3 that is the swing center of the grindstone 1 for superfinishing during superfinishing grinding
When and are offset by the radial distance A and the axial distance B, the radius of curvature R1 of the superfinishing stone 1 and the surface W to be ground are
Even if the curvature radius R2 of a is the same value, the superfinishing stone 1
However, as shown by a broken line in FIG. 1B, the workpiece W is partially contacted with the surface Wa to be ground.

Even in such a case, the superfinishing grindstone 1 is slidably moved on the ground surface Wa of the workpiece W having an arc-shaped cross section while the grindstone central portion 2 having a small elastic modulus is deformed. Needless to say, there is no processing residue, and super finishing grinding is carried out without increasing the amount of grindstone wear and the amount of workpiece W removed. The cost can be reduced.

In the meantime, the elastic moduli of the grindstone end portions 3 forming the arcuate end portions of the arcuate ground surface 1a are equal to each other.
Since it is set to be larger than the elastic modulus of, the superfinishing grindstone 1 is made by the edge portion of the grinding surface Wa of the work W.
It will prevent things from being damaged.

Therefore, in this superfinishing grindstone 1, even if the precision in the preprocessing of the superfinishing grinding is uneven as described above, the superfinishing grinding is performed without affecting the quality. As a result, the pre-processing accuracy of the super finish grinding process is alleviated.

Further, in this embodiment, the size and shape of the superfinishing grindstone 1 are almost the same as those of the conventional superfinishing grindstone, so that it is not necessary to modify the equipment such as the grindstone mounting base 5. Therefore, the quality can be improved without increasing the cost of super finishing grinding.

FIG. 2 shows an embodiment of the superfinishing grinding method according to claim 6 of the present invention. In this superfinishing grinding method, the superfinishing grindstone 1 of the previous embodiment is used.

As shown in FIG. 2, in this superfinishing grinding method, the arcuate grinding surface 1a of the superfinishing grindstone 1 is pressed against the grinding surface Wa of the work W, and the superfinishing from the edge portion of the grinding surface Wa is completed. The protrusion amounts L1 and L2 of the grinding wheel 1 are the arc-direction widths H1 of the grindstone end portions 3 of the superfinishing grinding wheel 1
The grinding wheel 1 for super-finishing is oscillated around the curvature center O1 of the arc-shaped grinding surface 1a (the curvature center O2 of the grinding surface Wa) so as to be smaller than H2 so as to grind the grinding surface Wa. ing.

Therefore, even if the super-finishing grindstone 1 slightly protrudes from the surface Wa to be ground during the super-finish grinding, only the end portions 3 and 3 of the grindstone having a large elastic modulus will protrude, and the work W to be ground will be ground. Since no shoulder sagging occurs at the edge portion of the surface Wa, the processing accuracy (contour accuracy) is improved.

FIG. 3 shows an embodiment of a grindstone for superfinishing according to claim 4 of the present invention.

As shown in FIG. 3, the difference between the superfinishing grindstone 11 in this embodiment and the superfinishing grindstone 1 in the previous embodiment is that the grindstones forming the arcuate end portions of the arcuate grinding surface 11a. The end portions 13 and 14 are set to have different elastic moduli from each other, and other configurations are the superfinishing stone 1
Is the same as.

In this superfinishing grindstone 11, for example, when superfinishing grinding of a surface to be ground having a large area under different processing conditions is carried out, the grindstone central portion 2 and the grindstone end portion 13,
14 not only has a different elastic modulus from
Since the elastic moduli of the four wheels are also different from each other, any part of the whetstone central portion 2 and the whetstone end portions 13 and 14 corresponds to a part having different processing conditions on the surface to be ground. A uniform and efficient superfinishing grinding process is performed on the entire surface.

FIG. 4 shows an embodiment of a grindstone for superfinishing according to claim 5 of the present invention.

As shown in FIG. 4, this grindstone for superfinishing 21
Is a flat plate as a whole, and the tip (upper end in the figure)
Has an arcuate grinding surface 21a.

The super-finishing grindstone 21 is formed by integrally press-molding resin-bonded grindstone materials having different elastic moduli, and the grindstone central portion 22 constituting the arc-direction central portion of the arc-shaped grinding surface 21a is separated from the grindstone central portion 22. The resin-bonded grindstone material is compounded so that the elastic modulus increases toward the grindstone end portions 23, 23 forming both ends of the arc-shaped ground surface 21a in the arc direction.

In this superfinishing grindstone 21, the elastic modulus from one grindstone end portion 23 to the other grindstone end portion 23 continuously changes. In addition, in the manufacturing process of the superfinishing grindstone 21, Since the elastic modulus distribution can be set according to the processing conditions of the work surface to be ground, the followability to the work surface to be ground is improved.

The detailed constructions of the superfinishing grindstone and the superfinishing grinding method according to the present invention are not limited to the above-mentioned embodiments.

[0043]

As described above, according to the first aspect of the present invention.
In the superfinishing grindstones according to 3 to 3, since the above-mentioned configuration is adopted, even if there is variation in accuracy in the preprocessing of the superfinishing grinding process, it is of course possible that no unprocessed residue occurs and the amount of wear of the grindstone. It is possible to perform super finishing grinding without increasing the removal amount of workpieces and workpieces, and without damaging the super finishing grindstone.As a result, the pre-processing accuracy of super finishing grinding can be relaxed. It is possible to realize this, and it is possible to perform super finishing grinding of the surface to be ground of the work in a short time without affecting the quality, and it is also an extremely excellent effect that the grinding processing cost can be reduced. Is brought about.

Further, since the superfinishing grindstone according to claim 4 of the present invention has the above-mentioned configuration, for example, superfinishing grinding of a surface to be ground having a large area under different processing conditions in the same processing surface is performed. In this case, one of the whetstone parts with different elastic moduli corresponds to the part of the surface to be ground under different processing conditions. Therefore, the entire surface of the surface to be ground should be a uniform and good super-finish grinding surface. It has an extremely excellent effect that is possible.

Further, since the superfinishing grindstone according to claim 5 of the present invention has the above-mentioned structure, the elastic modulus from one grindstone end to the other grindstone end can be continuously changed. In addition to this, since the distribution of the elastic modulus can be changed according to the processing conditions of the surface to be ground in the manufacturing process, it is possible to further improve the followability of the superfinishing grindstone to the surface to be ground of the workpiece. That is an extremely excellent effect.

On the other hand, since the superfinishing grindstone according to claim 6 of the present invention has the above-mentioned structure, even if the superfinishing grindstone slightly protrudes from the surface to be ground during the superfinishing grinding process, Since it is possible to prevent the edge portion of the surface to be ground in shoulder from being shoulder-shouldered, there is an extremely excellent effect that the contour accuracy can be improved.

[Brief description of drawings]

FIG. 1 is an overall perspective explanatory view (a) and an operational explanatory view (b) showing an embodiment of a superfinishing grindstone according to claims 1 to 3 of the present invention.

FIG. 2 is an operation explanatory view showing an embodiment of the super-finish grinding method according to claim 6 of the present invention.

FIG. 3 is an overall perspective explanatory view showing an embodiment of a grindstone for superfinishing according to claim 4 of the present invention.

FIG. 4 shows an embodiment of a superfinishing grindstone according to claim 5 of the present invention, in which the transition of the elastic modulus from one grindstone end to the other grindstone end is made to correspond to each part of the superfinishing grindstone. Is a graph shown by.

FIG. 5 is an overall perspective view showing a conventional grindstone for superfinishing.

FIG. 6 is an operation explanatory diagram showing a situation in which superfinishing grinding is performed using a conventional grindstone for superfinishing.

FIG. 7 is an operation explanatory view showing a situation in which superfinishing grinding is performed using a conventional grindstone for superfinishing so that one-sided contact does not occur.

[Explanation of symbols]

1,11,21 Super finishing whetstone 1a, 11a, 21a Arc-shaped ground surface 2,22 Whetstone center 3,13,14,23,23 Grindstone end Wa Grinding surface

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B24D 3/02 B24B 35/00 B24D 7/14 B24D 5/14

Claims (6)

(57) [Claims] 1. A superfinishing grindstone having an arcuate grinding surface and oscillating in the arcuate direction of the arcuate grinding surface to grind a surface to be ground, wherein a central portion of the arcuate grinding surface in the arc direction is formed. The elastic modulus of the central portion of the grindstone is set to be smaller than the elastic modulus of the end portions of the grindstone forming the arcuate end portions of the arcuate grinding surface, and the central portion of the grindstone is provided with a binder containing a resin. A super finishing whetstone characterized by. 2. The superfinishing whetstone according to claim 1, wherein the whetstone central portion and the whetstone end portion are made of different whetstones. 3. The grindstone for superfinishing according to claim 1, wherein the grindstone end portion is provided with a binder containing any one of ceramics, metal and resin. 4. The grindstone for superfinishing according to claim 1, wherein the grindstone end portions forming the arcuate end portions of the arcuate ground surface have different elastic moduli. 5. The superfinishing whetstone according to claim 1, wherein the whetstone central portion and the whetstone end portion are integrally formed of a resin-bonded whetstone material. 6. Grinding a surface to be ground having a circular arc-shaped cross section continuously provided in the circumferential direction of a rotating workpiece by using the grindstone for superfinishing according to any one of claims 1 to 5. In this case, pressing the arc-shaped grinding surface of the superfinishing grindstone to the surface to be ground of the work, the protrusion amount of the superfinishing grindstone from the surface to be ground than the arc direction width of the grindstone end in the superfinishing grindstone A superfinishing grinding method, characterized in that the grindstone for superfinishing is swung in an arc direction while being kept within a small range.