JPH04129671A - Correction device for grinding wheel of machine tool - Google Patents

Abstract

PURPOSE:To make a chattering phenomenon difficult to be caused, by forming a trueing face orthogonal with the peripheral face of a projection part at the tip of a truncated cone cylindrical projection part which expands its diameter toward the tip formed with its inclination at 45 deg. in the axial direction of a truer fitting shaft and substrate, on the substrate of a truer. CONSTITUTION:A truncated cone cylindrical projection part 25b expanding its diameter toward the tip with its 45 deg. inclination in the axial direction of a truer fitting shaft 24 and substrate is formed on the substrate 25a of a truer 25, and a trueing face 25c orthogonal with the peripheral face of the projection part is formed at the tip of this projection part. So trueing is executed, with the projection part of the truer being made orthogonal with the moving direction of a spindle 15 and grindwheel 16, and with the trueing face provided on the tip face of the projection part being press-fitted to the end face and outer peripheral face of the grindwheel, in the case of trueing the end face and outer peripheral face of the grindwheel 16. Consequently the biting of this projection part into the grindwheel can be reduced, even in case of the projection of the truer being deflected by the trueing resistance, a chattering phenomenon is difficult to be caused, so the grindwheel can be corrected with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a grindstone correction device for machine tools such as machining centers and grinding centers equipped with a grinding function.

[Conventional technology]

Conventionally, the above-mentioned machine tools have a table that reciprocates horizontally, a saddle that is supported by a column and that reciprocates horizontally in a direction perpendicular to the direction of movement of the table, and a machine that is supported by the saddle and moves vertically in the vertical direction. a vertical main shaft supported by the 20-axis head and rotated around the axis, and into which a cylindrical grindstone made of a CBN grindstone or a diamond grindstone is fitted, and the workpiece is held on the table. There were some products that were ground using the above-mentioned grindstone.

In such machine tools, grinding is performed by pressing the outer circumferential surface and lower end surface of the grindstone against the workpiece on the table, but this grinding process causes the outer circumferential surface and lower end surface of the grindstone to wear and deform. A grindstone correction device is provided to correct these surfaces into predetermined shapes.

As shown in FIGS. 5 and 6, the correction device has a base 2 fixed to a table 1 of a machine tool, and a device main body 3 and a truer mounting shaft 4 pivotally supported on the base 2.
is inclined upward at 45° with respect to the horizontal plane of table l. A board 5a of a truer 5 is removably fixed to the tip of the mounting shaft 4 protruding from the device main body 3. In the true 5, a thin annular part 5b protrudes from the outer peripheral surface of the substrate 5a, and the annular part 5b is arranged perpendicularly from the center in the axial direction, that is, in the thickness direction, so that the truing part on the outer periphery forms a horizontal surface 5c and a vertical surface 5d. It is bent.

The grindstone correction device rotates the truer 5 by rotating the mounting shaft 4 using an electric motor.

In this state, the worn cylindrical whetstone 6 is moved while being rotated by the vertical main axis of the machine tool, so that the lower end surface of the whetstone 6 is attached to the horizontal surface 5 provided on the annular portion 5b of the truer 5.
Trueing is carried out by pressing the grinding wheel 6 into contact with C, and the outer circumferential surface of the grinding wheel 6 is trued by a vertical surface 5d provided on the annular portion 5b of the grinding wheel 5. The truing mentioned above is a machine tool saddle.

This is done by moving the shaft head and table appropriately.

[Problem that the invention seeks to solve]

In the conventional grinding wheel correction device for a machine tool, the truer mounting shaft 4 and the truer 5 are inclined at 45 degrees with respect to the axial direction of the main shaft and the grinding wheel 6, and the substrate 5a and thickness of the truer 5 are The thin annular portion 5b is at a right angle. During truing, the horizontal surface 5C and the vertical surface 5b provided on the annular portion 5b of the truer 5 press against the lower end surface and outer peripheral surface of the grindstone 6 at an angle of 45 degrees. Therefore, as shown in FIG. 7, when truing is performed while the horizontal surface 5C of the truer 5 is brought into pressure contact with the lower end surface of the grinding wheel 6 and the grinding wheel 6 is horizontally moved in the direction shown by the arrow in FIG. The annular portion 5b is bent as shown by the chain line in FIG. 7 due to the truing resistance, and the annular portion 5b bites into the grindstone 6, which may cause a chattering phenomenon during truing. Also,
While moving the whetstone 6 upward, the outer peripheral surface of the whetstone 6 is
In the case of truing on the vertical surface 5d, the annular portion 5b of the luer 5 bends and bites into the whetstone 6, as in the case of truing the lower end surface of the whetstone 6 described above. Therefore, there was a problem that the grindstone 6 could not be corrected with high accuracy.

An object of the present invention is to provide a grindstone correction device for a machine tool that can correct the grindstone with high precision by solving the above-mentioned problems by making it difficult for the truer to bite into the grindstone during truing. .

Means for Solving Problem C11] In the machine tool grinding wheel correction device according to the present invention, a Trua board is fitted onto a Trua mounting shaft that is inclined at 45 degrees with respect to the main shaft, and the mounting shaft and the board are mounted on this board. 4 in the axial direction
A truncated conical cylindrical protrusion is formed that is inclined at 5° and expands in diameter toward the tip, and a truing surface that is perpendicular to the circumferential surface of the protrusion is formed at the tip of the protrusion, so that the The protrusions are orthogonal to each other, and the end face and outer peripheral surface of a cylindrical grindstone fitted on the main shaft are brought into pressure contact with the truing surface, respectively, to correct the grindstone.

[For production]

The grinding wheel correction device according to the present invention has a truncated conical cylindrical protrusion that is inclined at 45 degrees with respect to the axial direction of the truer mounting shaft and the base plate and expands in diameter toward the tip on the base of the truer, and the tip of this protrusion. Since a truing surface is formed perpendicular to the circumferential surface of the protrusion, when truing the end face and outer circumferential surface of the grinding wheel, the protrusion of the truing is orthogonal to the main axis and the direction of movement of the grinding wheel, and the tip of the protrusion is Truing can be performed by pressing the truing surface provided on the surface against the end surface and outer circumferential surface of the grindstone (see FIG. 1). For this reason, even if the protruding part of the truing bends due to the truing resistance, the protruding part is less likely to bite into the grinding wheel compared to the conventional grinding wheel described above (see Figure 4), and the chattering phenomenon is less likely to occur. can be corrected with high precision.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 1 to 4.

In FIGS. 2 and 3, reference numeral 11 denotes a table that is supported by a bed (not shown) and horizontally reciprocates in the front and back (Y-axis) direction.A column 12 is erected to straddle the table 11. A saddle 13 is supported that horizontally reciprocates above the table 11 in the left-right (X-axis) direction. A shaft head 14 that vertically reciprocates in the vertical (Z-axis) direction is supported on the saddle 13, and a vertical main shaft 15 that rotates around the shaft is supported on the shaft head 14. A cylindrical grindstone 16 made of a CBN grindstone or a diamond grindstone is removably fitted to the tip of the main shaft 15 via a holder 17 coaxially therewith. Note that the above configuration is similar to a conventional machine tool with a grinding function.

A movable base 18 is fixed to the front lower part of the column 12, and the base (18) has a pivot shaft 1 projecting to the front side.
9 is fixed. A movable base 20 is pivotally supported on the pivot shaft 19 so as to be pivotable in the front-rear direction. A cylinder mechanism 21 is provided at the bottom of the base 18, and the cylinder mechanism 21
The distal end of the cylinder 21a is pivotally attached to the base 18, and the distal end of the piston 21b is pivotally attached to the movable base 20.

Further, a grindstone correction device 22 is provided on a mounting surface 20a formed on the front surface of the movable table 20 so as to be located directly below the main shaft 15.

The grindstone correction device 22 has a device main body 23 fixed to a mounting surface 20a of a movable table 20, and a grinder mounting shaft 2 on the device main body 23.
4 is pivoted. The mounting shaft 24 is arranged so that its axial direction is parallel to the mounting surface 20a of the movable base 20, and a substrate 25a of the truer 25 is removably fitted and fixed to the tip of the mounting shaft 24. An electric motor 26 is fixed inside the device main body 23,
The mounting shaft 24 and the truer 25 are driven by the electric motor 26.
are configured to rotate together. Said Tsurua 2
5, as shown in FIG. 1, a protruding portion 25b is formed in the shape of a truncated conical cylinder with a light spreading surface whose inner and outer circumferential surfaces are inclined at an angle of 45 degrees with the axis of the mounting shaft 24 from the outer circumference of the tip of the substrate 25a. has been done. A truing surface 25c is provided at the tip of the protrusion 25b.
is formed, and the truing surface 25c is formed to be perpendicular to the outer circumferential surface of the protruding portion 25b. In addition, the movable base 20 includes a stopper block 27 for the turning end and a base 18.
A stopper bolt 28 for the swing end, which the stopper block 27 abuts, is threadedly fitted into the stopper bolt 2.
8 is tightened with a locking nut 29. Moreover, 30 is a touch sensor for automatic measurement of the grindstone diameter provided on the mounting surface 20a of the movable table 20.

Next, the operation of the grindstone correction device 22 according to this embodiment will be explained.

When the grindstone 16 is not being corrected, the movable base 20 is erected vertically as shown by the solid line in FIGS. 2 and 3, and the cylinder mechanism 2 is
The piston 21b of No. 1 is kept in a retracted state. In this state, the movable table 20 and the grinding wheel correction device 2 provided thereon are
2 is located on the outside of the top surface of the table 11, and the grinding wheel correction device 22 prevents the loading and unloading of the workpiece to and from the top surface of the table 11, and the grinding of the workpiece by the lower end surface and outer peripheral surface of the grindstone 16. It can be done without any trouble.

If the grinding wheel 16 is worn out due to grinding of the workpiece, the cylinder mechanism 21 is operated to advance the piston 21b with no workpiece on the table 11, and the rotation axis 1
The movable base 20 is rotated counterclockwise in FIG. 2 about 9, and the mounting surface 20a of the movable base 20 is brought from the vertical position shown by the solid line in FIG. 2 to the horizontal position shown by the chain line in the same figure. In this way, the grinding wheel correction device 22 enters onto an example part of the table 11 together with the movable base 20, and the stopper block 27 provided on the movable base 20 comes into contact with the tip of the stopper bolt 28 attached to the base 18 from below. The movable base 20 is supported so that the mounting surface 20a is horizontal. When the mounting surface 20a of the movable table 20 becomes horizontal, the shaft 124a of the mounting shaft 24 of the grindstone correction device 22 becomes inclined upward at 45 degrees with respect to the horizontal surface. In this state, while rotating the grindstone 16 around the axis of the main shaft 15 by rotating the main shaft 15, the shaft head 14
vertical (Z-axis) movement of the saddle 13 and left/right (X-axis) movement of the saddle 13
The truing of the truer 25, which is rotated around the axis of the mounting shaft 24 by the drive of the electric motor 26, moves the lower end surface of the grinding wheel 16 in the same direction as shown by the solid line in FIGS. 1 and 2. It is brought into pressure contact with the surface 25C, and the lower end surface of the grindstone 16 is trued and corrected using this truing surface 25c. Further, while rotating the grindstone 16 around the axis of the main shaft 15,
By moving the shaft head 14 vertically and the saddle 13 horizontally, the outer peripheral surface of the grindstone 16 is rotated around the mounting shaft 24 as shown by the chain line in FIGS. 1 and 2. Tsurua 2
5, and the outer peripheral surface of the grindstone 16 is trued with this truing surface 25c.

The truing of the lower end surface of the grinding wheel 16 is performed using the shaft head 14.
is moved downward to lower the grindstone 16 together with the main shaft 15 to a desired position, and as shown by the solid line in FIG.
The saddle 3 is horizontally moved by the portion of the protrusion 25b located above the truing surface 25c, and the grindstone 16 is moved in the left-right direction together with the main shaft 15. In this case, the protruding part 25b of the truer 25 is perpendicular to the moving direction of the main shaft 15 and the grinding wheel 16, and the truing surface 25c provided at the tip of the protruding part 25b presses against the lower end surface of the grinding wheel 16 to perform truing. .

Therefore, even if the protrusion 25b of the truer 25 is bent as shown by the chain line in FIG. 4 due to the truing resistance, the protrusion 25b is less likely to bite into the grindstone 16, so that the chattering phenomenon is less likely to occur. Note that when the whetstone 16 moves horizontally in a required plane, such as one reciprocation, and the lower end surface of the whetstone 16 is separated from the truing surface 25c of the truer 25, the shaft head 14
is moved downward by a predetermined amount, and the above-described truing using the truing surface 25c is repeated multiple times. After modifying the lower end surface of the grindstone 16 as described above, the saddle 1
2 and the shaft head 14 to move the grindstone 16 together with the main shaft 15, as shown by the chain line in FIG.
The outer circumferential surface of the grindstone 16 is dressed by the portion of the protrusion 25b located below the truing surface 25c, which moves the shaft head 14 up and down to move the grindstone 16 up and down together with the main shaft 15. In this case, the protruding part 25b of the truer 25 is perpendicular to the movement direction of the main shaft 15 and the grinding wheel 16, and the truing surface 25c provided at the tip of the protruding part 25b presses against the outer peripheral surface of the grinding wheel 16 to perform truing. Become. Therefore, similarly to the case of trueing the lower end surface of the grindstone 16 described above, it is possible to reduce the protrusion 25b of the truer 25 biting into the grindstone 16, and the chattering phenomenon is less likely to occur. Note that, at a position where the outer peripheral surface of the grinding wheel 16 is moved up and down a required number of times and the outer peripheral surface of the grinding wheel 16 is separated from the truing surface 25c of the turning surface 25c, the saddle 13 is moved by a predetermined amount.
Move it to the 5 side and repeat truing multiple times.

The truing of the lower end surface of the grindstone 16 and the truing of the outer peripheral surface may be performed first.

After completing the truing of the lower end surface and outer peripheral surface of the whetstone 16, the rotation of the whetstone 16 and the truer 25 is stopped,
By moving the shaft head 14 in the vertical direction and moving the saddle 13 in the left and right directions, the main shaft 15 and the grindstone 16 are returned to their positions before truing. Thereafter, by retracting the piston 21b of the cylinder mechanism 21 and rotating the movable base 20 clockwise in FIG. The grindstone correction device 22 moves out from above one example of the table 11 and returns to the state before operation.

In the above-mentioned embodiment, the grindstone correction device was rotatably mounted on the column, and the grindstone correction device was advanced onto the table only when correcting the grindstone, but the grindstone correction device according to the present invention is shown in FIG. Similar to the conventional device shown, it may be fixedly provided on the table of a machine tool.

〔Effect of the invention〕

As explained above, the present invention provides a tool for attaching a truer mounting shaft of a grinding wheel correction device to a main shaft of a machine tool that reciprocates in the axial direction of the main shaft and in a direction orthogonal to the axial direction. A grindstone correction device for a machine tool, which corrects the outer circumferential surface and end surface of a cylindrical grindstone that is fitted on the main shaft and rotates around the axis, using a truer that is tilted and fitted on the mounting shaft, At 45 degrees to the axial direction of the mounting shaft and the board to the board of the truer.
A truncated conical cylindrical protrusion that is inclined and expands in diameter toward the tip is formed, and a truing surface that is orthogonal to the circumferential surface of the protrusion is formed at the tip of the protrusion, so that the protrusion Since the grindstone is corrected by orthogonal to each other and the end face and outer peripheral surface of the grindstone are brought into pressure contact with the truing surface, the following effects can be obtained.

That is, in the grinding wheel correction device according to the present invention, a truncated conical cylindrical protrusion that is inclined at 45 degrees with respect to the axial direction of the truer mounting shaft and the base plate and expands in diameter toward the tip is formed on the truer base plate, and this protrusion Since a truing surface is formed at the tip of the truing surface perpendicular to the circumferential surface of the protruding part, when truing the end face and outer circumferential surface of the grinding wheel, the protruding part of the truing is orthogonal to the main axis and the moving direction of the grinding wheel, and the protruding part Trueing can be performed by pressing the truing surface provided on the tip surface of the grindstone against the end surface and outer peripheral surface of the grindstone (see FIG. 1). For this reason, even if the protruding part of the truing bends due to the truing resistance, the protruding part is less likely to bite into the grinding wheel compared to the conventional grinding wheel described above (see Figure 4), and the chattering phenomenon is less likely to occur. can be corrected with high precision.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the tip of a straighter mounting shaft and the truer of a grinding wheel correction device for a machine tool according to an embodiment of the present invention, and FIGS. A partially sectional front view and a side view showing the correction device; FIG. 4 is an explanatory view of the operation of the grinding wheel correction state using a straighter according to the same embodiment; FIG. 5 is a front view showing a conventional grindstone correction device for a machine tool. FIG. 6 is a vertical cross-sectional view showing the main body of the apparatus, the truer mounting shaft, and the truer of the conventional example, and FIG. 7 is an operation explanatory view showing the grinding wheel correction state by the truer of the conventional example. DESCRIPTION OF SYMBOLS 11... Table, 12... Column, 13... Saddle, 14... Shaft head, 15... Main shaft, 16... Grinding wheel, 22... Grinding wheel correction device, 23... Device Main body, 2
4...Trua mounting shaft, 25...Trua, 25a...
- Substrate, 25b... Protrusion, 25c... Truing surface. Figure Figure

Claims (1)

[Claims] The truer mounting shaft of the grinding wheel correction device is inclined at 45 degrees with respect to the main shaft of a machine tool whose main shaft is configured to reciprocate in the axial direction of the main shaft and in a direction perpendicular to this axial direction, and the tool is fitted onto this mounting shaft. In the grinding wheel correction device for a machine tool, the outer circumferential surface and the end surface of a cylindrical grindstone that is fitted onto the main shaft and rotates around the axis are corrected by means of a truer, which is attached to the base plate of the truer. A truncated conical cylindrical protrusion is formed that is inclined at 45 degrees with respect to the axial direction of the substrate and expands in diameter toward the tip, and a truing surface that is orthogonal to the circumferential surface of the protrusion is formed at the tip of the protrusion, and the main axis A grindstone correction device for a machine tool, characterized in that the protrusion is orthogonal to the moving direction of the grindstone, and the grindstone is corrected by pressing an end face and an outer peripheral surface of the grindstone against the truing surface.