JPH1190824A - Grinding wheel correcting method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the working effectiveness and accuracy in the truing or dressing operation by dispensing with the mounting, removing, and replacing operations for a truing grinding wheel and a dressing grinding wheel. SOLUTION: A corrective grinding wheel part 17 in hollow cylindrical form is furnished on one circumference with a truing grinding wheel part 40 and a dressing grinding wheel part 41 and the truing grinding wheel 40 and dressing grinding wheel 41 are rotationally indexed to the truing position or dressing position of a work processing grinding wheel round the axis passing the center of the work processing grinding wheel rotating and perpendicularly intersecting the rotational axis of the work processing grinding wheel and the work processing grinding wheel is subjected to truing or dressing while the corrective grinding wheel part 17 is rotated within the angular range θ on the circumference on which the truing grinding wheel 40 or dressing grinding wheel 41 is arranged, or left without rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device and a method for repairing a grindstone for machining a work, whose outer peripheral surface is spherical and disk-shaped.

[0002]

2. Description of the Related Art An aspherical processing apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 7-299746 is a processing apparatus provided with a grindstone correcting apparatus for forming the outer peripheral surface of a work processing grindstone into a spherical shape. As shown by 7, the work processing grindstone 24
5 is rotated around a vertical axis, and is formed on the circumference as shown in FIG. 5 on a base 50 fixed to bolts (not shown) on a truer shaft 52 that rotates about an axis perpendicular to this axis. Cup type truer 51 (truing stone for truing)
Truing the grinding wheel for workpiece processing into a spherical shape. In addition to dressing, dressing is performed by a dressing whetstone in order to improve the sharpness of the work processing whetstone.

[0003]

In the prior art described above, since the truing whetstone and the dressing whetstone use separate dedicated whetstones, they need to be attached and detached and exchanged, resulting in poor work efficiency. In addition, when the truing whetstone and the dressing whetstone are detached and replaced, the whetstone may be misaligned, which has an adverse effect on the truing accuracy and the dressing accuracy.

[0004] It is an object of the present invention to provide a grindstone repair apparatus and a grindstone repair method that eliminate the need for the work of attaching and detaching truing grindstones and dressing grindstones, and improve the efficiency and accuracy of truing or dressing work.

[0005]

According to a first aspect of the present invention, there is provided a whetstone repair apparatus for achieving the above object.
This is a correction device for a grinding wheel for work processing, which is rotationally driven and has a spherical and disk-shaped outer peripheral surface, and has a hollow cylindrical shape in which two grinding wheel portions, a truing grinding wheel portion and a dressing grinding wheel portion, are arranged on the same circumference. The whetstone for whetstone correction, and the work processing whetstone is embedded in the inner peripheral portion of the whetstone correction whetstone, and the whetstone correction whetstone is rotated around an axis orthogonal to the rotation axis of the work processing whetstone. And a drive means for rotating and indexing the truing whetstone part and the dressing whetstone part of the whetstone correcting whetstone to the truing position or the dressing position of the work processing whetstone.

[0006] The whetstone-correcting whetstone in the whetstone-correcting device is characterized in that a truing whetstone part and a dressing whetstone part are arranged at opposing positions on the circumference.

[0007] The method for repairing a grinding wheel according to the present invention is described in claim 3.
As described in the above, a method for correcting a grinding wheel for work processing, which is rotationally driven and the outer peripheral surface is spherical and disk-shaped, wherein two grinding wheel portions of a truing grinding wheel portion and a dressing grinding wheel portion are arranged on the same circumference. The work processing grindstone is embedded in the inner peripheral portion of the hollow cylindrical grindstone correction grindstone, and the truing grindstone part and the dressing grindstone part of the grindstone correction grindstone are the rotation axes of the work grindstone. While rotating and indexing the work processing grindstone to the truing position or the dressing position about the orthogonal axis, the angle on the circumference where the truing grindstone portion or the dressing grindstone portion is disposed. The work processing grindstone is trued or dressed by being rotated within the range.

Further, the grinding wheel repairing method according to the present invention is a method for repairing a grinding wheel for work processing, which is driven to rotate and has a spherical and disk-shaped outer peripheral surface, wherein the grinding wheel is provided on the same circumference. The work processing grindstone is embedded in the inner periphery of a hollow cylindrical grindstone correction grindstone in which two grindstone parts of a truing grindstone part and a dressing grindstone part are arranged, and the truing grindstone of the grindstone grindstone is provided. Part and the dressing grindstone portion are rotationally indexed to a truing position or a dressing position of the work processing grindstone around an axis orthogonal to a rotation axis of the work processing grindstone, and the work piece is not rotated without rotating the grindstone correcting grindstone. The present invention is characterized in that the processing grindstone is truing or dressing.

[0009] Further, in the above-mentioned whetstone correcting method, the whetstone for correcting whetstone is a whetstone in which a truing whetstone part and a dressing whetstone part are arranged at opposing positions on a circumference. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an aspherical surface processing apparatus and its control unit, and FIG. 2 is a side view thereof. 1 and 2, reference numeral 10 denotes a bed, and reference numeral 11 denotes a work guide table fixed on the bed 10. A work slide table 12 is provided on the work guide table 11 in the X axis direction (traverse feed direction). ).

The work slide table 12 is controlled to be fed in the X-axis direction by a feed screw (not shown) rotated by a servo motor 13 installed on the work guide table 11. A work support 14 is fixed on the work slide table 12, and a vacuum chuck 15 is provided on the front surface of the work support 14, and the work W is held by the vacuum chuck 15.

In addition, the work slide table 12
Above, a grindstone correction device 16 is fixed in parallel with the work support 14 in the X-axis direction. A grindstone 17 for correcting a grindstone described later is rotatably supported on the grindstone correcting device 16 around an axis parallel to the Z direction perpendicular to the X-axis. The grindstone 17 is rotated by a servomotor 18. In addition, the rotary encoder 19 rotates the indexing rotation described later and swings in a predetermined rotation range.

1 and 2, reference numeral 20 denotes a whetstone guide table fixed on the bed 10 in the direction of the work guide table 11, on which the whetstone slide table 21 has an X-axis and a whetstone slide table 21. It is installed so as to be movable in the Z-axis direction (cut feed direction) at right angles. The grindstone slide table 21 is moved by a feed screw (not shown) rotated by a servomotor 26 installed on the grindstone guide table 20.
Feed control is performed in the axial direction.

A column 22 is installed vertically on the grinding wheel slide table 21. A grinding wheel head 23 is movable on the side of the column 22 facing the work W in the vertical Y-axis direction (pic feed). is set up.
The grindstone head 23 is controlled to be fed in the Y-axis direction by a feed screw (not shown) rotated by a servomotor 27 installed on the column 22.

As shown in FIG. 6, the grindstone head 23 has
A work-processing grindstone 24 whose outer peripheral surface is spherical and disk-shaped is rotatably supported around a vertical axis orthogonal to the rotation axis of the grindstone correction grindstone 17, and the work-processing grindstone 24 is rotated by a motor 25. Driven.

In FIG. 1, reference numeral 28 denotes a numerical controller for controlling and managing the entire aspherical surface processing apparatus. The interface 32, the servo motors 13, 18, 26, 27 and the drive circuit 34,
Second interface 33 connected to 35, 36, 37
It is constituted by.

When the workpiece W is to be aspherically processed by the above-mentioned aspherical surface processing apparatus, first, the numerical controller 28 is operated according to the processing program, so that a traverse drive command corresponding to the shape data (X, Y, Z) is issued. The signal is applied to the servo motor 13 via the drive circuit 34, whereby the work slide table 12 including the work W is moved in the X-axis direction, and the work W is moved to the processing position.
In this state, by applying a cutting drive command signal from the numerical controller 28 to the servomotor 26 via the drive circuit 36, the grinding wheel slide table 21 including the grinding wheel head 23 is cut and fed in the Z-axis direction. The workpiece W is subjected to one-pass machining in the X-axis direction by simultaneous two-axis control of the workpiece W and the Z-axis.

When the above-described one-pass machining for the workpiece W is completed, a pick feed drive command signal is applied from the numerical controller 28 to the servomotor 27 via the drive circuit 35 based on the machining program and the shape data, thereby causing the grindstone head 23 to move. Move one pitch in the Y-axis direction. After one pitch feed in the Y-axis direction of the grindstone head 23 is completed, the above-described simultaneous two-axis control of the X-axis and the Z-axis is performed again.
Work W is processed in one pass. Thereafter, by repeating the same operation, the entire surface of the work W is processed into an aspheric surface according to the shape data.

After the processing of the work W is completed, the work slide table 12 is moved to
6 is moved to a position where the rotation axis of the grindstone 17 for grinding wheel and the center of the grindstone of the grindstone 24 for workpiece processing coincide with each other, and the grindstone 24 for workpiece processing is corrected by the grindstone 17 for grindstone correction.

Therefore, the grindstone correcting device 16 according to the present invention is used.
As shown in FIG. 3, a hollow cylindrical grindstone for grinding wheel 17 in which two grindstone portions of a truing grindstone portion 40 and a dressing grindstone portion 41 are arranged on the same circumference, A servo motor 18 for rotating the wheel 17 around an axis perpendicular to the rotation axis of the work processing grindstone 24 through the center of the work processing grindstone 24; a truing grindstone portion 40 of the grindstone correction grindstone 17; It is provided with a driving means for the rotary encoder 19 for rotatingly indexing the grindstone portion 41 to a truing position or a dressing position of the work processing grindstone 24.

The truing whetstone 40 and the dressing whetstone 41 disposed on the whetstone correction whetstone 17
As shown in FIG. 3, the two whetstone portions may be divided into four, which are a truing whetstone portion 40 and a dressing whetstone portion 41, at opposing positions on the circumference, or as shown in FIG. As described above, the truing whetstone part 40 and the dressing whetstone 41 may be divided into two adjacent parts.

The grinding wheel repairing method by the grinding wheel repairing device 16 includes a truing grinding wheel portion 4 of the grinding wheel repairing wheel 17.
0 and rotating indexing to the truing position or dressing position of the work processing grindstone 24 around an axis passing through the center of the work processing grindstone 24 rotating the dressing grindstone part 41 and orthogonal to the rotation axis of the work processing grindstone 24. The work processing grindstone 24 is trued or dressed by rotating the grindstone correcting grindstone 24 within an angular range θ on the circumference where the truing grindstone part 40 or the dressing grindstone part 41 is disposed. The rotation angle of the grindstone 17 for correcting the grindstone is determined by a rotary encoder 19.
The rotation index and the rotation within the angle range θ are controlled by applying a command signal of the numerical controller 28 to the servo motor 18 via the drive circuit 37.

In the above description, the grinding wheel 17 is rotated within the angular range θ on the circumference where the truing grindstone portion 40 or the dressing grindstone portion 41 is disposed. Workpiece grinding wheel 24 while stopped
Can be truing or dressing.

Thus, the work processing grindstone 24 can be trued or dressed by one grindstone correction grindstone 17.

[0025]

As described above, according to the present invention, it is possible to perform truing or dressing of a work processing grindstone with one grindstone correcting grindstone.
As in the past, there is no need to replace or replace with a grinding wheel for truing or dressing dedicated grinding wheel correction, so work efficiency is improved, and there is no misalignment due to mounting errors etc. that occurred every time replacement work was performed, The accuracy of truing or dressing can be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an aspherical surface processing apparatus to which the present invention is applied and a control unit thereof.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a front view of a grinding wheel for repairing a grinding wheel according to the present invention.

FIG. 4 is a front view showing another embodiment of the grindstone for modifying a grindstone according to the present invention.

FIG. 5 is a front view of a conventional grinding wheel for repairing grinding wheels.

FIG. 6 is a side sectional view showing a state in which a grinding wheel is repaired by a conventional grinding wheel for repairing a grinding wheel.

FIG. 7 is a plan view of a state in which a grinding wheel is repaired by a conventional grinding wheel for repairing a grinding wheel.

[Explanation of symbols]

 Reference Signs List 14 Work support base 16 Grinding stone correcting device 17 Grinding stone correcting grindstone 18 Servo motor 19 Rotary encoder 23 Grinding stone head 24 Work processing grindstone 28 Numerical control unit 40 Truing grindstone part 41 Dressing grindstone part

Claims (5)

[Claims] An apparatus for correcting a work processing grindstone, which is rotationally driven and whose outer peripheral surface is spherical and disk-shaped, wherein two grindstone parts, a truing grindstone part and a dressing grindstone part, are arranged on the same circumference. A hollow cylindrical grinding wheel for grinding wheels,
The work processing grindstone is provided inside the inner peripheral portion of the grindstone correction grindstone, and the grindstone correction grindstone is rotated around an axis orthogonal to a rotation axis of the work grindstone,
A grindstone correcting apparatus, comprising: a driving means for rotating and indexing the truing grindstone portion and the dressing grindstone portion of the grindstone for grindstone to the truing position or the dressing position of the work processing grindstone. 2. The grindstone correcting device according to claim 1, wherein the grindstone correcting grindstone has a truing grindstone portion and a dressing grindstone portion at opposite positions on a circumference. 3. A method of repairing a grinding wheel for work processing, which is rotationally driven and has a disk-shaped outer peripheral surface, wherein two grinding wheel portions, a truing grinding wheel portion and a dressing grinding wheel portion, are arranged on the same circumference. The work processing grindstone is embedded in the inner peripheral portion of the hollow cylindrical grindstone correction grindstone, and the truing grindstone part and the dressing grindstone part of the grindstone correction grindstone are the rotation axes of the work grindstone. While rotating and indexing the work processing grindstone to the truing position or the dressing position about the orthogonal axis, the angle on the circumference where the truing grindstone portion or the dressing grindstone portion is disposed. A grinding wheel correction method, characterized in that the grinding wheel for work processing is trued or dressed by being rotated within a range. 4. A method of repairing a grinding wheel for work processing, which is rotationally driven and has a disk-shaped outer peripheral surface, wherein two grinding wheel portions, a truing grinding wheel portion and a dressing grinding wheel portion, are arranged on the same circumference. The work processing grindstone is embedded in the inner peripheral portion of the hollow cylindrical grindstone correction grindstone, and the truing grindstone part and the dressing grindstone part of the grindstone correction grindstone are the rotation axes of the work grindstone. The work processing grindstone is trued or dressed by rotating and indexing the work processing grindstone to the truing position or the dressing position of the work processing grindstone around the orthogonal axis. Whetstone correction method. 5. The grindstone according to claim 3, wherein the grindstone for modifying a grindstone is a grindstone in which a truing grindstone portion and a dressing grindstone portion are arranged at opposing positions on a circumference. How to fix.