JP7398096B2 - How to modify the grinding surface of a rotary whetstone - Google Patents

Description

The present invention relates to a method for modifying a grinding surface of a rotary grindstone in which dressing can be performed using a grinding surface modification device for performing truing.

Patent Document 1 discloses a grinding device that is equipped with a truing device and a dressing device, respectively, in the vicinity of a rotating grindstone. That is, in this grinding device, truing and dressing of the rotary grindstone are performed by different devices.

Japanese Patent Application Publication No. 2-237768

In the grinding device of Patent Document 1, truing and dressing are performed individually by the truing device and the dressing device, respectively, so when the two operations of truing and dressing are performed consecutively, the time between the two operations is There is a problem in that it takes a total amount of time due to the time lag. Furthermore, since it is necessary to separately provide a truing device and a dressing device, the grinding device becomes larger and has a more complicated structure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for modifying the grinding surface of a rotary grindstone in which dressing of the rotary grindstone can be performed using a device that enables truning.

In order to achieve the above object, the present invention provides a method for modifying the grinding surface of a rotary whetstone in which the grinding surface of a rotary whetstone is corrected by using the outer circumferential surface as the grinding surface. At the same time, using a plurality of adjacent rotary correction bodies having correction action surfaces perpendicular to the axis, the rotary grindstone is moved across the plurality of rotary correction bodies along a straight line passing through the rotation centers of the plurality of rotation correction bodies. The grinding surface of the rotary grindstone is dressed by moving the rotary correction body in the radial direction.

According to the above method, since dressing is performed by the rotation correction body that enables truing, there is no need to provide dedicated equipment for truing and dressing, and it is possible to avoid increasing the size of the grinding equipment and complicating its structure. .

According to the present invention, it is possible to perform truing and dressing with a single device.

Front view of the grinding machine. FIG. 3 is a perspective view of the correction device. A simplified diagram showing the power relationship of the correction device. FIG. 3 is a plan view showing a rotation correction body. A plan view showing a truing state. A plan view showing a dressing state. A simplified diagram showing abrasive grains of a rotating whetstone.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described based on the drawings.
As shown in FIG. 1, a table 13 is supported on the top surface of the bed 12 of the grinding machine 11 so as to be movable in the X-axis direction, and a workpiece 100 is supported on the top surface of this table 13. A column 14 is supported on the bed 12 so as to be movable in the Z-axis direction, and a rotary grindstone 15 that is rotated about an axis extending in the Z-axis direction is mounted on the column 14 in the Y-axis direction (vertical direction). movably supported.

The correction device 21 is configured as follows.
As shown in FIGS. 1, 2, and 4, a rotary correction body 23 consisting of a pair of cup-shaped grindstones rotatably supported by a shaft 24 parallel to the Y-axis is arranged close to the casing 22 of the correction device 21. has been done. The upper surfaces of both rotary correction bodies 23 are located in the same plane, and the upper surfaces serve as a correction action surface 231.

As shown in FIG. 3, a motor 25 is installed inside the casing 22. A chain 29 is interposed between a sprocket 27 on the output shaft 26 of the motor 25 and a sprocket 28 on both shafts 24. The rotation correction body 23 is simultaneously rotated in the same direction and at the same speed. Therefore, as is clear from FIG. 4, in the vicinity of both rotation correction bodies 23, the rotation directions of both rotation correction bodies 23 are reversed when viewed from above.

The correction device 21 has a magnet (not shown) on its bottom surface, and the correction device 21 is fixed to the top surface of the table 13 by the magnetic force of the magnet. The fixing device 21 can be fixed at any arbitrary position, for example, the rear part of the installation position of the workpiece 100 is selected.

Next, the grindstone correction method of this embodiment will be explained.
FIG. 5 shows the truing state. When truing the grinding surface 151 which is the outer peripheral surface of the rotary grindstone 15, the axis of the rotary whetstone 15 is arranged so as to point in the radial direction of the rotation correction body 23 when viewed from above in the axial direction of the rotation correction body 23. . In this state, the lower end of the grinding surface 151 of the rotary grindstone 15 is reciprocated with respect to the correction working surface 231 of the rotary correction body 23 along the radial direction (arrow β direction) of the rotation correction body 23 shown by the arrow. That is, in this truing, by driving the motor 25, the rotation correction body 23 is simultaneously rotated in the same direction at the same rotation speed (about 10 to 6000 rpm) via the chain 29, etc., and the rotating grindstone 15 is also rotated. . At this time, the rotation direction P of the lower end of the grinding surface 151 of the rotary grindstone 15 is made to be the same direction as the rotation direction Q of the correction action surface 231 of the rotation correction body 23. Further, the circumferential speed of the grinding surface 151 of the rotary grindstone 15 is set to be the same as the circumferential speed of the inner diameter position 232 of the correction action surface 231 of the rotary correction body 23.

Then, the grinding surface 151 of the rotary grindstone 15 is applied to the correction action surface 231 of one of the rotation correction bodies 23, and the rotation grindstone 15 is parallel to the axial direction of the rotation correction body 23, as indicated by the arrow β of the rotation correction body 23. Reciprocate in the radial direction. The reciprocating speed at this time is considerably slower than the circumferential speed of the grinding surface 151. In this way, a slight speed difference is generated between the grinding surface 151 and the correction action surface 231 except for the inner diameter position 232 of the correction action surface 231 of the rotation correction body 23. Therefore, the grinding surface 151 is peeled off at the portion where the speed difference occurs, and the grinding surface 151 is trued.

After truing has been performed for a predetermined period of time on the correction surface 231 of one rotary correction body 23, the rotary grindstone 15 is rotated on the correction surface 231 of the other rotation correction body 23 in the same manner as described above. It is caused to reciprocate in parallel to the axial direction and in the radial direction (direction of arrow β) shown by the arrow of the rotation correction body 23. In this way, truing is performed. Therefore, the shape of the grinding surface 151 of the rotary grindstone 15 is adjusted.

FIG. 6 shows the dressing state of the rotary grindstone 15. When dressing the grinding surface 151 of the rotary whetstone 15, the positional relationship between the rotary whetstone 15 and the correction working surfaces 231 of both rotary correction bodies 23 is determined by a straight line passing through the center of rotation α of the rotary correction body 23, as shown in FIG. L and the center line in the width direction of the rotary grindstone 15 are aligned so that they are located within one plane in the vertical direction. In this positional relationship, the circumferential speed (about 10 to 6000 rpm) of the grinding surface 151 of the rotary grindstone 15 is made to match the circumferential speed of the inner diameter position 232 of the correction action surface 231 of the rotary correction body 23. In this state, the rotary grindstone 15 is reciprocated in the direction of the arrow γ along a straight line L passing through both the rotation centers α. In this case, the reciprocating speed of the rotary grindstone 15 is much slower than the circumferential speed. Note that during dressing, a slight speed difference (about 1:1.1 to 3) may occur between the rotary grindstone 15 and the rotary correction body 23.

In this way, the abrasive bonding material 154 of the grinding surface 151 of the rotary grindstone 15 is moved from both sides of the grinding surface 151 in the width direction by the correction action surface 231 of the rotation correction body 23, as shown by the arrow S in FIG. Grinded diagonally. Therefore, the abrasive bonding material 154 on the front side (left side in FIG. 7) and both sides of the abrasive grain 152 in the rotational direction is scraped off. In this way, the grinding surface 151 is sharpened so that the abrasive grains 152 on the grinding surface 151 are protruded while the residual portion 153 of the bonding material 154 continues on the rear side in the rotational direction of the abrasive grains 152. In this way, dressing of the rotating grindstone 15 is performed.

This embodiment has the following effects.
(1) The pair of rotation correction bodies 23 can perform truing and dressing of the rotary grindstone 15. Therefore, unlike conventional grinding equipment, a dedicated truing device and a dedicated dressing device are not required. Therefore, the configuration of the grinding device becomes simple and it becomes possible to reduce the size of the grinding device.

(2) Since dressing is performed over a wide area of the correction action surfaces 231 of the pair of rotational correction bodies 23, dressing can be performed more efficiently in a shorter time than when dressing is performed pinpointly using a sharp-edged dresser. It becomes possible to do so.

(3) When performing truing and dressing in succession, both operations can be performed at the same location, compared to a grinding machine that is equipped with separate truing and dressing devices. The time lag between tasks can be reduced and continuous tasks can be carried out efficiently.

(4) Since dressing is performed by reciprocating the rotary grindstone 15 in both rotary correction bodies 23, both rotary correction bodies 23 are evenly ground by the rotary whetstone 15. Therefore, the heights of the correction action surfaces 231 of both rotary correction bodies 23 can be matched. Therefore, following this dressing, it becomes possible to perform highly accurate truing.

(5) In truing, the ground surface 151 is ground and shaped by being peeled off due to the speed difference with the rotation correction body 23, but the roughness of the surface shape of the ground surface 151 is not necessarily good. There are things I can't say. However, in this embodiment, since a grinding action is applied from both sides of the grinding surface 151 during dressing following truing, the roughness of the grinding surface 151 is eliminated, contributing to high precision grinding of the workpiece 100.

(Example of change)
Each of the embodiments described above can be modified and implemented as follows. Each embodiment and the following modification examples can be implemented in combination with each other within a technically consistent range.

- Obtain an image by photographing the grinding surface 151 of the rotary grindstone 15 after truing or dressing with a camera, and automatically evaluate the condition of the grinding surface 151 by comparing the image with a preset reference image. thing. Then, when the truing and dressing of the grinding surface 151 reach a predetermined level, the truing and dressing are finished.

- In processing the workpiece 100, detecting the cutting load and the state of the grinding surface 151 of the rotary grindstone 15 to determine the timing to start truing and the timing to start dressing.

11... Grinding machine 15... Rotary grindstone 21... Correction device 23... Rotating correction body 24... Shaft 151... Grinding surface 231... Correction action surface 232... Inner diameter position

Claims (4)

In a method for modifying the grinding surface of a rotary whetstone that uses the outer peripheral surface as the grinding surface,
Using a plurality of adjacent rotary correction bodies that are rotated in the same direction around one parallel axis and have a correction surface perpendicular to the axis, the rotary grindstone is moved in the radial direction of the plurality of rotary correction bodies. , and a method of truing the grinding surface by the correction action surface by moving the rotary grindstone in the axial direction; A method for modifying a grinding surface of a rotary grindstone, comprising: dressing the grinding surface of the rotary grindstone by moving the rotary correction body in the radial direction across the correction body. The grinding surface correction method of a rotary grindstone according to claim 1, wherein the circumferential speed of the grinding surface of the rotary grindstone and the rotation speed of the rotation correction body are made equal. 3. The grinding surface correction method of a rotary grindstone according to claim 2 , wherein the circumferential speed of the grinding surface of the rotary grindstone is made equal to the circumferential speed of the inner diameter position of the correction working surface of the rotary correction body. 2. The grinding surface correction method of a rotary grindstone according to claim 1 , wherein truing is carried out by moving the rotary grindstone on parallel lines of a pair of rotation correction bodies.