JPH0369663B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a grindstone correction device for a cylindrical grinder.

Prior Art The NC grinding wheel correction device for a cylindrical grinding machine uses a ball circulating linear bearing on the feed guide surface to ensure smooth positioning, and a ball screw for the feed drive.

Problems to be Solved by the Invention When extremely high precision is required in devices using such ball guides, waveforms (waving) with a wave value of about 1 μm or less occur due to slight irregularities in the circulation of the ball. Due to the feeding, it was not possible to straighten the grinding wheel to meet the requirements. Also, for this reason, the features of NC control could not be fully utilized.

Means for solving the problem A first plate is installed on the grinding wheel stand and parallel to the grinding wheel axis on the upper surface.
a correction table 3 having a guide surface; a first movable table 5 for traverse that is guided by the first guide surface 3a via a linear bearing 4 and has a second guide surface 5a in the radial direction of the grindstone 1 on the upper surface; an NC-controlled first ball screw drive device 7 that is provided on the correction table 3 and causes the first moving table 5 to traverse; and the second guide surface 5a.
A third guide surface 9a that is movably guided through a linear bearing 8 and parallel to the second guide surface on the upper surface.
a second movable table 9 for displacement absorption having a second movable table 9; a third movable table 11 for cutting guided by the third guide surface 9a via a linear bearing 10; an NC-controlled second ball screw drive device 13 that applies cutting feed to the third moving table 11 to create a shape; a correction tool 20 that is rotatably and indexably provided on the third moving table 11; A template 16 is provided on the table 3 parallel to the grinding wheel axis and has a linear contact surface on the opposite side to the grinding wheel for absorbing the waving phenomenon, and a feeler is provided on the lower surface of the second movable table 9 and contacts the template 16. 1
7, the template 16 and the feeler 1 inserted between the first moving table 5 and the second moving table 9.
It includes a spring member 18 that urges the second movable table 9 and the grinding wheel toward the grinding wheel so as to keep the wheels in constant contact with each other.
This is done by NC control, and feeding in the cutting direction is performed arbitrarily by NC control regardless of the template.

Embodiment A correction table in a well-known cylindrical grinding machine that has two guide surfaces 3a parallel to the grindstone shaft on the rear side of the grindstone shaft on a grindstone stand 2 which rotatably supports a grindstone shaft with a grindstone 1 fitted at the tip thereof. 3 is fixed. This guide surface 3
Traverse table 5 via linear bearing 4 to a
The traverse table 5 has two guide surfaces 5a on its upper surface in a direction perpendicular to the grinding wheel axis, and is rotatably supported on the correction table 3 by a bearing.
It is traversed by a ball screw 7 whose drive is controlled by an NC-controlled servo motor 6. A linear bearing 8 is mounted on the guide surface 5a of the traverse table 5.
A moving table 9 is placed thereon. On this movable table 9, there are also two guide surfaces 9 perpendicular to the grinding wheel axis.
a is provided, and a cutting table 11 is placed on this guide surface 9a via a linear bearing 10. The cutting table 11 is equipped with an NC-controlled servo motor 12 rotatably supported on the moving table 9 by a bearing.
Cutting feed is provided by a ball screw 13 controlled by . A template mount 14 is attached to the rear of the upper surface of the correction table 3 parallel to the grinding wheel axis so that its parallelism with the grinding wheel axis can be adjusted by an adjustment bolt 15 screwed into the bracket 3b on the correction table 3. . A template 16 whose surface opposite to the grindstone is in linear contact is fixed to the template mount 14, and a feeler 17 is attached to the lower surface of the movable table 9 with respect to the template 16. Further, in order to keep the template 16 and the feeler 17 in constant contact, a spring 18 is interposed between a contact plate 9a fixed to the front end of the movable table 9 and the end surface of the traverse table 5 on the grindstone side. Further, on the cutting table 11, a diamond turning index shaft 22 is rotatably supported in a direction perpendicular to the grinding wheel shaft, and a diamond holder 21 having a diamond tool 20 inclined on the outer peripheral surface of the grinding wheel is fixed concentrically so as to be replaceable. The rotation indexing shaft 22 has a pinion 23 fixed thereto and a rack 24
It is rotated 180° by.

Operation When a command to correct the grinding wheel is issued to the correction device in which the cutting table 11 is in the backward position and the traverse table 5 is in the leftmost position (Fig. 2), the NC-controlled servo motor 12
is rotated, the cutting table 11 is moved forward to a predetermined position by the ball screw 13, and the traverse table 5 is moved to the NC position.
The control servo motor 6 rotates in forward and reverse directions to cause reciprocal traverse feeding by the ball screw 7. Cutting table 1
1 is given cutting feed little by little by a servo motor 12, and the diamond tool 20 comes into contact with the outer periphery of the grindstone 1 to perform dressing. While the traverse table 5 traverses, the movable table 9 is also traverse-feeded, and the feeler 17 provided on the lower surface of the movable table 9 is in contact with the template 16 by the force of the spring 18. In the conventional type, the traverse table 5 moves with a slight wobble due to a waving phenomenon caused by slight irregularities in the balls of the ball screw and linear bearing. However, the movable table 9 is mounted and guided by a linear bearing so that it can lightly slide in the radial direction of the grinding wheel on the traverse table 5, and the feeler 17 is regulated by the straight surface of the template 16, so that the waving-like wobbling movement of the traverse table 5 is avoided. Move straight without following.
Therefore, the diamond tool 20 can straighten the outer circumferential width direction of the grindstone 1. If the workpiece is changed and the grindstone is replaced, it is necessary to dress the grindstone to match the shape of the workpiece, which can be done by changing the NC command program.

Effects As detailed above, in the present invention, a movable table is provided between the traverse table and the cutting table so as to be movable in the radial direction of the grinding wheel on the traverse table, and the radial movement is regulated by the template. Therefore, it is possible to absorb the minute waving phenomenon in the direction of the grinding wheel axis due to the balls of the ball screw and linear bearing, and it is possible to make straight corrections in the direction of the width of the grinding wheel, which has the effect of obtaining a highly accurate ground surface. Further cut,
Since the traverse feed is performed under NC control, when the grinding wheel is changed to match the workpiece, even if the grindstone has many steps, it is possible to handle a wide range of situations by simply changing the NC command program.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the grindstone correction device in the radial direction of the grindstone, and FIG. 2 is a sectional view of the same device in the axial direction of the grindstone. 3... Correction table, 5... Traverse table, 9... Moving table, 11... Cutting table, 16... Template,
17...Feera, 18...Spring.

Claims (1)

[Claims] 1. A correction table provided on the grindstone head and having a first guide surface parallel to the grindstone axis on the upper surface, and a second guide surface in the radial direction of the grindstone guided by the first guide surface via a linear bearing on the upper surface. a first moving table for traverse; an NC-controlled first ball screw drive device provided on the correction table for traversing the first moving table; a second movable table for displacement absorption having a third guide surface parallel to the second guide surface on the upper surface; a third movable table for cutting guided by the third guide surface via a linear bearing; an NC-controlled second ball screw drive device provided on the second moving table to create a shape by applying cutting feed to the third moving table; and a modification provided on the third moving table so as to be rotatable and indexable. a tool, a template provided on the correction table in parallel with the grinding wheel axis and having a linear contact surface opposite to the grinding wheel for absorbing a waving phenomenon; and a template provided on the lower surface of the second movable table and in contact with the template. a feeler; and a spring member inserted between the first movable table and the second movable table and biasing the second movable table toward the grindstone so as to keep the template and the feeler in constant contact. An NC grindstone correction device characterized in that the feed in the direction of the grindstone axis is performed by NC control while being regulated by the template, and the feed in the cutting direction is arbitrarily performed by NC control regardless of the template.