JPH0236058A - Simultaneous grinder for inner and outer diameter - Google Patents

Abstract

PURPOSE:To prevent the positioning of chucking time and displacement at grinding time for a work by a centering shoe by assembling a centering shoe into a packing plate so as to become freely slidable in the axial direction and supporting the inner diameter angular part of a work with the tip taper face of this centering shoe. CONSTITUTION:In case of grinding the inner and outer diameters by grindstones 4, 5 by chucking a work A from both end faces in the width direction with a packing plate 2 and pressure plate 5, the inner diameter angular part of the work A is supported by the taper face 15 of a centering shoe 11. The positioning of a chucking time and the displacement of grinding time for the work A by this centering shoe 11 are prevented. Consequently deformation is eliminated on the inner and outer diameters of the work A by reducing the slope grinding power even in case of reducing the chucking power and a finishing roundness can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a grinding machine that simultaneously grinds the inner and outer diameters of a workpiece held by a width clamp chunking method. .

[Prior Art] Fig. 3 shows a conventional grinding machine that simultaneously grinds the inner and outer diameters of a thin ring-shaped workpiece. Pressure plates 5, which are rotatably mounted and have a hollow interior inside which the internal grinding wheel 4 can be moved, are arranged facing each other, and the backing plate 2 and the bränsher plate 5 chuff the workpiece A from the width direction. The structure is such that the inner and outer diameter grinding wheels 4 and 6 located inside and outside of the workpiece A simultaneously grind the inner and outer diameters of the workpiece A.

The pressure plate 5 can move forward and backward with respect to the backing plate 2 together with the support member 3, and in the forward position, the pressure plate 5 is pressed forward by a hydraulic cylinder 7 provided on the support member 3, thereby moving the workpiece A onto the backing plate 2. It is now chaffing.

[Problem to be solved by the invention] By the way, if the workpiece to be ground has a thin ring-like structure with holes around it, like the cage of a constant-velocity joint, it is easily deformed by external force. Therefore, when chuffing force is applied from both end faces, deformation occurs in the inner and outer diameters, and when the chuck is released after grinding, the deformation recovers, causing a problem in that the roundness of the inner and outer diameters deteriorates.

In addition, if the chaffing force is reduced in order to reduce the deformation caused by the chaffing force and improve shape accuracy, the normal force during grinding causes a shift in the chucking position of the workpiece, resulting in abnormal grinding. There is.

This invention was made in order to solve the above-mentioned problems, and even if the chaffing force is reduced, the chucking position of the workpiece does not shift due to the normal grinding force, and the chucking position of the workpiece does not shift due to the normal grinding force. The purpose of the present invention is to provide a simultaneous inner and outer grinder that can grind a workpiece to a high degree of roundness.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention incorporates a centering shoe into a backing plate so that it can move freely in the axial direction, and has a tapered surface on the outer periphery of the tip of the centering shoe that supports the inner diameter corner of the workpiece. The configuration includes the following.

[Function] When chafing a workpiece from both end faces in the width direction using the backing plate and pressure plate and grinding the inner and outer diameters with a grindstone, the inner diameter corner of the workpiece is supported by the tapered surface of the centering shoe, and this centering shoe It positions the workpiece when chucking it and prevents it from shifting during grinding, thereby reducing the chaffing force.However, the workpiece does not shift due to normal grinding force, and by reducing the chunking force, the inner and outer diameters of the workpiece can be adjusted. This eliminates deformation and improves the roundness of the finished product.

[Embodiments] Hereinafter, embodiments of the present invention will be described based on FIGS. 1 and 2 of the accompanying drawings. Note that the same parts as in the conventional example shown in FIG. 3 will be described using the same reference numerals.

In FIG. 1, a center ring knee 11 is installed inside a backing plate 2 formed in a ring shape so as to be able to slide freely in the axial direction, and a spring seat 13 is fixed inside the backing plate 2 with a retaining ring 12. The center ring shoe 11 is elastically biased to move toward the work A side by a coil spring 14 contracted between the center ring shoes 11 and 14.

Backing plate 2 of the centering shoe 11 above
As shown in Figure 2, the workpiece A is attached to the outer periphery of the tip protruding from the
A tapered surface 15 is formed to support the inner diameter corner of the workpiece A, and this tapered surface 15 serves both for positioning and centering when chucking the workpiece A and for preventing positional deviation during grinding.

The centering shoe 11 is moved in the axial direction by a rod 17 of a hydraulic drive device 16 installed at the rear, and is moved to the rear position by the hydraulic drive device 16 when supplying and discharging the workpiece A. It looks like this.

Note that the tapered surface 15 provided on the centering knee 11
The angle θ and the elasticity of the coil spring 14 may be selected as appropriate depending on the type of workpiece to be ground.

The simultaneous inner and outer diameter grinding machine of the present invention has the above-mentioned configuration, and when the workpiece A is chucked by the backing plate 2 and the pressure plate 5, the centering shoe 11 released from the hydraulically driven Vi position 16 is pressed by the coil spring 14. The tapered surface 15 provided at the tip fits into the inner diameter corner of the workpiece A, and performs positioning and centering during chucking.

At this time, as shown in FIG. 1, the centering shoe 11 is in a state where it leaves a movement stroke in the forward direction between it and the backing plate 2, and the elasticity of the coil spring 14 is applied to the centering ring for positioning the workpiece. is working effectively.

When the inner and outer diameters of the workpiece A are simultaneously ground by the inner and outer grindstones 4 and 6, the centering shoe 11 prevents the workpiece from being displaced due to normal grinding force.

Therefore, the workpiece A during grinding is the centering shear 11.
Even if the chunking force exerted on the workpiece from the width direction by the backing plate 2 and pressure plate 5 is reduced, the workpiece will not be displaced due to the normal grinding force.

Therefore, the workpiece channing force during grinding can be reduced to reduce the occurrence of deformation of the workpiece, and simultaneous grinding of the inner and outer diameters with high roundness can be performed.

When the grinding is completed, the hydraulically driven bag r! At step 116, the centering shoe 11 is moved to the withdrawal position to separate the tapered surface 15 from the workpiece 8, and the grindstone 4.6 is withdrawn to take out the workpiece 8.

〔effect〕

As described above, according to the present invention, in a grinding machine that uses a grindstone to simultaneously grind the inner and outer diameters of a workpiece chucked from the width direction by a backing plate and a pressure plate, a centering ring is installed in the backing plate.
- is incorporated so that it can freely move in the axial direction, and the tapered surface of the tip of this centering shoe supports the inner diameter corner of the workpiece, so the centering shoe can be used for positioning and grinding when chucking the workpiece. Even when the chunking force is reduced, the workpiece position does not shift due to the normal grinding force. Therefore, the workpiece crushing force can be reduced when simultaneously grinding the inner and outer diameters of a thin ring-shaped workpiece. This prevents deformation of the workpiece and enables simultaneous grinding of inner and outer diameters with high roundness.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a simultaneous inner and outer diameter grinding machine according to the present invention;
FIG. 2 is an enlarged sectional view of the main parts of the same as above, and FIG. 3 is a longitudinal sectional view showing a conventional simultaneous inner and outer diameter grinding machine. 2...Backing plate, 4...Inner diameter grinding wheel, 5...Pressure plate, 6...Outer diameter grinding wheel, 11...Mountain/center ring Shoe 14...Coil spring, 15...Tapered surface. C”N r\

Claims (1)

[Claims] (1) The width of the workpiece is clamped by a backing plate and a pressure plate, which is placed in a position facing the backing plate so as to be rotatable by static pressure and has a hollow interior in which the grinding wheel can be moved. In this simultaneous grinding machine, the inner and outer diameters of the workpiece are simultaneously ground by a grindstone.A centering shoe is incorporated into the backing plate so as to be movable in the axial direction, and the inner diameter corner of the workpiece is supported on the outer periphery of the tip of this centering shoe. A simultaneous grinder for inner and outer diameters characterized by a tapered surface.