JP2001071266A - Setting method for rotary grinding wheel and grinding machine provided with setting dresser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set on the peripheral face of a rotary grinding wheel to improve sharpness of the rotary grinding wheel when dressing the rotary grinding wheel. SOLUTION: The rotary grinding wheel 19 comprises abrasive grains 24 and a bond 25. A setting dresser 22 is made of a material harder than the abrasive grain 24. When the setting dresser 22 rotating to the opposite direction against the rotary grinding wheel 19 is slidingly contacted with the peripheral face of the grinding wheel 19 and a speed difference is caused between the two 19, 22, only a peripheral face 28 of the bond 25 is ground by the setting dresser 22. Accordingly, a peripheral face 27 of the abrasive grains 24 projects to improve sharpness of the rotary grinding wheel 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sharpening a rotary grindstone and a grinder provided with a dressing dresser for sharpening the rotary grindstone.

[0002]

2. Description of the Related Art Generally, in a grinding machine, a work held on a work table of the grinding machine is ground by a disk-shaped rotating grindstone. As shown in FIG. 5, the grindstone 1 is composed of abrasive grains 2 and an adhesive bond 3 for bonding the abrasive grains 2 to each other. Since the bond 3 has a lower strength than the abrasive grains 2, in order to grind the work with the rotating grindstone 1, as shown in the lower part of FIG. Fixed length a for bond 3
It is preferable to protrude only because the sharpness is good. However, while grinding the workpiece with the rotary grindstone 1, the bond 3 is largely shaved, the abrasive grains 2 are crushed, or the abrasive grains 2 separate from the bond 3 and fall off. The surface gradually becomes rough. When the outer peripheral surface of the grindstone 1 becomes rough, dressing with a dresser is performed in order to form the outer peripheral surface of the grindstone 1, and the outer peripheral surface of the grindstone 1 becomes a smooth surface along a predetermined arc as shown by a dotted line in FIG. Had been processed.

[0003]

However, when the outer peripheral surface of the grindstone 1 is processed in such a smooth manner, there is a problem that the sharpness is inferior to a state in which only the abrasive grains 2 protrude.

[0004] An object of the present invention is a dressing method for selectively grinding a bond portion of an outer peripheral surface of a rotary grindstone so that abrasive grains protrude from the outer peripheral surface to improve the sharpness of the rotary grindstone. And a grinding machine provided with a dressing dresser for performing the method.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, the rotating grindstone is made of a metal which is softer than abrasive grains of the rotating grindstone and harder than the grindstone bond. The gist of the present invention is a method of sharpening a rotary grindstone that sharpens a rotary grindstone by pressing a dressing dresser and causing a speed difference between the two.

According to a second aspect of the present invention, in the method of the first aspect, the dressing dresser is constituted by a rotating body. The gist of the invention according to claim 3 is a grinding machine in which a dressing dresser made of a metal material that is softer than the abrasive grains of the rotating grindstone and harder than the grindstone bond is provided in the moving region of the rotating grindstone.

According to a fourth aspect of the present invention, in the grinding machine according to the third aspect, the dressing dresser is constituted by a rotating body. According to a fifth aspect of the present invention, in the grinding machine according to the fourth aspect, the dressing dresser is disposed adjacent to the forming dresser.

According to a sixth aspect of the present invention, in the grinding machine according to the fifth aspect, the dressing dresser and the forming dresser are integrally rotatably supported on the same axis, and the dressing dresser and the forming dresser are driven by a motor. The rotating grindstone is configured to rotate at a different rotation speed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention embodied in a grinding machine will be described below in detail with reference to FIGS.

As shown in FIG. 2, a saddle 13 is provided on the main body 12 of the surface grinding machine 11 so as to be movable back and forth (in a direction perpendicular to the paper surface). A work table 15 is provided on a rail 14 provided on the upper surface of the saddle 13 so as to extend left and right.
Are supported movably to the left and right, and a work 16 is held on the work table 15. As the saddle 13 moves back and forth and the work table 15 moves left and right, the work 16
2 is moved back and forth and left and right.

At the rear of the main body 12, a square box-shaped column 17 is provided.
A grindstone head 18 is provided on the front surface of the column 17.
Are supported to be able to move up and down. A grindstone 19 is rotatably mounted on the grindstone head 18. Therefore, by moving the grindstone head 18 up and down while rotating the grindstone 19 by driving means (not shown),
The upper work 16 is ground.

The work 16 on the work table 15
Dressing dresser 21 and dressing dresser 22
Are mounted via the support base 20. As shown in FIG. 3, the forming dresser 21 and the dressing dresser 22 are supported so as to be integrally rotatable on the same axis, and are driven by a motor 23, which is also coaxially connected and serves as rotation driving means. The two dressers 21 and 22 are disc-shaped rotary dressers for dressing the grindstone 19, and the rotation directions of the two dressers 21 and 22 are opposite to the rotation direction of the rotary grindstone 19, as indicated by arrows in FIG. The dressers 21 and 22 are rotated by the motor 23 at a rotation speed different from the rotation speed of the rotary grindstone 19. Both dressers 2
The rotation speeds of the rotation wheels 1 and 22 may be higher or lower than the rotation speed of the rotary grindstone 19. The forming dresser 21 is a rotating whetstone 1
The dressing dresser 22 includes diamond abrasive grains having a hardness greater than 9, and the dressing dresser 22 is formed from a raw stainless steel before quenching. As shown in FIG. 1, the grindstone 19 is composed of abrasive grains 24 and bonds 25. The stainless raw material forming the dressing dresser 22 is softer than the abrasive grains 24 of the rotary grindstone 19, harder than the bond 25, and has stickiness.

Next, the operation of the surface grinding machine 11 configured as described above will be described. As shown in FIG. 2, when the work 16 on the work table 15 is ground by the rotating grindstone 19, the sharpness of the rotating grindstone 19 gradually decreases as the grinding progresses. In this case, dressing is performed to restore the grinding ability of the rotary grindstone 19. To perform the dressing, the grinding of the work 16 is temporarily stopped, the work table 15 is moved back and forth and left and right, and the forming dresser 21 is brought close to the rotating grindstone 19, as shown in FIG.
The forming dresser 21 is disposed immediately below the rotating shaft of the rotating grindstone 19. At this time, the rotating grindstone 19 is rotated by driving means (not shown), and the forming dresser 21 is rotated by the motor 23. Next, the rotary grindstone 19 is lowered together with the grindstone head 18, and the outer peripheral surface of the forming dresser 21 and the outer peripheral surface of the rotary grindstone 19 are slidably contacted with each other. This state is shown in FIG.

As shown in FIG. 4, the forming dresser 21 and the rotary grindstone 19 rotate in opposite directions with a predetermined speed difference. Since the forming dresser 21 is made of a material harder than the rotating grindstone 19, both the abrasive grains 24 and the bond 25 are ground by the forming dresser 21. The outer peripheral surface 26 of the rotary grindstone 19 after being ground by the forming dresser 21 is dressed to a smooth surface. As shown in FIG. 3, when the thickness of the rotating grindstone 19 is larger than the thickness of the forming dresser 21, if the forming dresser 21 is moved back and forth along the axial direction, the entire outer peripheral surface of the rotating grindstone 19 is shaded. Dressing without.

When the dressing by the forming dresser 21 is completed, the rotating grindstone 19 is moved upward to separate from the forming dresser 21, and then the work table 15 is moved to move the rotating grindstone 19 above the dressing dresser 22. And, as in the case of using the molded dresser 21,
The rotating grindstone 19 is lowered directly below the dressing dresser 22, and the rotating grindstone 19 is pressed against the dressing dresser 22, as shown in FIG. In addition, a speed difference is generated between the two. Then, since the dressing dresser 22 is formed of a material softer than the abrasive grains 24 and harder than the bond 25, the outer peripheral surface of the rotary grindstone 19 is ground by the outer peripheral surface of the dressing dresser 22. At this time, the outer peripheral surface 27 of the abrasive grain 24 remains projecting without being ground, and only the outer peripheral surface 28 of the bond is cut. In this manner, dressing is performed by grinding only the bond 25 and protruding the abrasive grains 24 to perform dressing, thereby further improving the sharpness of the grindstone 19.
Like the forming dresser 21, the dressing dresser 22 can be dressed over the entire outer peripheral surface of the rotating grindstone 19 by moving back and forth along the axial direction.

After the dressing by the dressing dresser 22, the sharpness of the rotating grindstone 19 is very good, so that the grinding work of the work 16 can be continued by the rotating grindstone 19 again.

As described in detail above, according to the grinding machine of the present embodiment, the following effects are obtained. A dressing dresser 22 formed of a material softer than the abrasive grains 24 and harder than the bond 25 on the work table 15;
Is provided, the sharpness of the grindstone 24 can be made better than dressing using only the forming dresser 21. -By forming the dressing dresser 22 and the forming dresser 21 from a rotating body, continuous dressing is possible. By providing both the dressing dresser 22 and the forming dresser 21 in advance, a complicated operation of replacing the dresser during the operation can be omitted. By arranging the dressing dresser 22 and the forming dresser 21 adjacent to each other, the space on the work table 15 can be effectively used. In addition, after the dressing by the forming dresser 21 is completed, the rotary grindstone 19 can be quickly moved above the dressing dresser 22 without moving the work table 15 and the saddle 13 significantly. By arranging the forming dresser 21 and the dressing dresser 22 adjacently on the same axis and connecting them to the motor 23, both dressers can be rotated by one motor 23, so that the configuration is simplified and economical. Can be manufactured.

The present embodiment can be modified as follows. In the present embodiment, the forming dresser 21 and the dressing dresser 22 are rotary dressers (rotary bodies), but may be rod-shaped or cone-shaped pointed dressers standing on the work table 15. -The material of the dressing dresser 22 may be a material other than the stainless steel raw material as long as the material is softer than the abrasive grains 24 and harder than the bond 25. The forming dresser 21 and the dressing dresser 22 may be independently provided at separate positions on the work table, and may be individually driven by the corresponding motors. By doing so, the rotation speed of each dresser can be adjusted so that desired dressing can be performed in accordance with the material and the rotation speed of the rotating grindstone 19. In the present embodiment, the rotation axis of the forming dresser 21 and the dressing dresser 22 and the rotation axis of the rotary grindstone 19 are parallel to each other, but each of the dressers 21 and 22 is oblique or orthogonal to the rotation axis of the rotary grindstone 19. Dressing may be performed by sliding in the direction. A plurality of forming dressers 21 or dressing dressers 22 may be provided on the work table. By doing so, it is not necessary to replace the dresser according to the material of the grindstone 19. The rotating direction of the rotating grindstone 19 and the forming dresser 21 or the dressing dresser 22 is determined by the rotating grindstone 19 and the dresser 21.
If there is a speed difference between the two, they may be rotated in the same direction.

[0019]

According to the first aspect of the present invention, only the bond can be ground on the outer peripheral surface of the grindstone and the abrasive grains can be projected, so that the sharpness of the rotary grindstone can be improved.

According to the invention described in claim 2, according to claim 1,
In addition to the effects of the invention described in (1), continuous dressing can be performed. According to the invention described in claim 3,
By providing the dressing dresser in the moving area of the rotating grindstone, the rotating grindstone can be quickly dressed only by moving the two relatively.

According to the invention set forth in claim 4, according to claim 3,
In addition to the effects of the invention described in (1), continuous dressing can be performed. According to the invention described in claim 5,
In addition to the effect of the invention described in claim 4, the space on the grinding machine can be effectively used, and at the same time, after the dressing by the forming dresser, the rotating grindstone can be quickly moved toward the dressing dresser.

According to the invention of claim 6, according to claim 5,
In addition to the effects of the invention described in (1), two dressers can be rotated by one motor, so that the configuration is simple and economical manufacturing is possible.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a state in which a rotary grindstone is dressed by a dressing dresser.

FIG. 2 is a front view of a surface grinding machine according to an embodiment of the present invention provided with a dressing dresser and a forming dresser on a work table.

FIG. 3 is a partially enlarged perspective view showing the arrangement of a grindstone, a forming dresser, a dressing dresser, and a motor.

FIG. 4 is an enlarged sectional view showing a state in which a rotary grindstone is being dressed by a forming dresser.

FIG. 5 is a partially enlarged cross-sectional view showing an outer peripheral surface of a grindstone in contact with a workpiece.

[Explanation of symbols]

11: grinding machine, 19: grinding stone, 21: forming dresser, 22
... dressing dresser, 23 ... motor, 24 ... abrasive grains, 25 ...
bond.

Claims (6)

[Claims] An abrasive dresser made of a metal material that is softer than the abrasive grains of the rotary grindstone and harder than the grindstone bond is pressed against the rotary grindstone, and a speed difference is generated between the two. A method of sharpening a rotating whetstone that sharpens. 2. The method of claim 1, wherein the dressing dresser comprises a rotating body. 3. A grinding machine provided with a dressing dresser made of a metal material that is softer than abrasive grains of a rotary grindstone and harder than a grindstone bond in a moving area of the rotary grindstone. 4. The grinding machine according to claim 3, wherein the dressing dresser is constituted by a rotating body. 5. The grinding machine according to claim 4, wherein the dressing dresser is arranged adjacent to the forming dresser. 6. The dressing dresser and the forming dresser according to claim 5, wherein the dressing dresser and the forming dresser are supported so as to be integrally rotatable on the same axis, and the dressing dresser and the forming dresser are rotated by a motor at a rotation speed different from that of the rotary grindstone. The configured grinding machine.