JP2000326195A - Grinding method for annular groove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To let an annular groove less interfere with a grinding wheel, let the grinding wheel large in diameter be used, enhance working efficiency, and lengthen the life of the grinding wheel. SOLUTION: The shaft of a cup shaped grinding wheel 16 identical in diameter to the annular groove (g) of a work W, having a tip end periphery the cross section of which is identical in shape to the cross section of the annular groove (g), is relatively inclined with respect to an axis passing through the center of the annular groove (g), so that the annular groove (g) of the work W is ground by the tip end periphery of the cup shaped grinding wheel 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for grinding an annular groove.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 4 and 5, grinding of an annular groove g on an end face of a work W such as a thrust ball bearing is performed by cutting a cross section having the same shape as that of the annular groove g of the work W. The axis of the circular grindstone 20 having an outer peripheral edge is orthogonal to the axis of the work W, and the grindstone 20 is rotated while rotating the work W and the grindstone 20.
Of the work W is pressed against the annular groove g of the work W.

[0003]

However, in the conventional method, when the diameter of the grindstone 20 is increased, the annular groove g interferes with the grindstone 20, and the notch in the outer region of the annular groove g indicated by oblique lines in the drawing becomes large. Therefore, the required accuracy cannot be satisfied. For this reason, the diameter of the grindstone 20 is usually limited to about 2 to 3 times the diameter (2R) of the cross section of the annular groove g, and there are problems such as poor machining efficiency and short life of the grindstone 20. .

[0004] The present invention has been made in view of the above-mentioned problems, and there is little interference between the annular groove and the grindstone, a grindstone having a large grindstone diameter can be used, the grindstone processing efficiency is good, and the life of the grindstone is prolonged. An object of the present invention is to provide a method for grinding an annular groove which can be performed.

[0005]

According to the present invention, there is provided a method for grinding an annular groove on an end face of a work using a grinding wheel, comprising the steps of: Having the same diameter as the groove, and
The axis of the cup-shaped grindstone having a tip edge having the same shape as the cross section of the annular groove is inclined relative to the axis passing through the center of the annular groove of the work, and the annular shape of the work is formed at the tip edge of the cup-shaped grindstone. The groove was ground.

In the method of the present invention, since the cup-shaped grindstone has the same diameter as the diameter of the annular groove of the work, interference with the annular groove is small and a large grindstone can be used. Further, since the axis of the cup-shaped grindstone is inclined relatively to the axis of the work, the contact area between the grindstone and the work is small, and a sufficient coolant can be supplied to the processing portion. For this reason, the grinding wheel processing efficiency is good, and the grinding wheel life is prolonged.

[0007]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a grinding apparatus for carrying out the method according to the invention. In this grinding apparatus, a headstock 2 and a grinding wheel head 3 are provided on a bed 1.

The headstock 2 includes a lower spindle 4 fixed on the bed 1, a spindle table 5 mounted on the lower spindle 4 and reciprocating in the X-axis direction (vertical direction in FIG. 1). A spindle section 6 mounted on the spindle table 5 and rotatable in a horizontal plane.

The spindle table 5 is positioned at a predetermined position in the X-axis direction by driving a servomotor 7 provided on the spindle lower base 4. The main shaft portion 6 is provided on the main shaft table 5 so as to be rotatable around a support shaft 8. The rotational position of the spindle 6 can be adjusted by driving the spindle swivel servomotor 9. Main shaft 6
A chuck 10 is attached to the main shaft 6a, and a circular flat work W having an annular groove g on an end face is held therein. When a motor (not shown) is driven, the main shaft 6 a of the main shaft 6 rotates together with the work W via the chuck 10.

The grindstone table 3 includes a grindstone table body 11, a grindstone table 12 provided on the grindstone table body 11 so as to be able to reciprocate in the Z-axis direction (left and right directions in FIG. 1), and fixed to the grindstone table 12. Wheel head 13.

The grinding wheel table 12 is positioned at a predetermined position in the Z-axis direction on the grinding wheel main body 11 by driving a table drive servomotor 14. A grinding wheel 16 is fixed to a tip of a rotating shaft 15 extending from the wheel head 13. When a motor (not shown) incorporated in the wheel head 13 is driven, the grinding wheel 16 is rotated via the rotating shaft 15 so that the annular groove g of the work W can be ground.

As shown in FIG. 2, the grinding wheel 16 has the same diameter (D = Dw) as the diameter (Dw) of the annular groove g of the work W.
w), and has a cup-shaped end having a cross-section (radius R = Rw) having the same shape as the groove cross-section (radius Rw) of the annular groove g.

The servo motor 7, the spindle swivel servo motor 9, the table driving servo motor 14 and the like are driven and controlled based on an input signal from a control device 17.

Next, a method for grinding the annular groove g of the work W in the grinding apparatus will be described.

First, the main shaft swivel servomotor 9 is driven to rotate the main shaft 6 around the support shaft 8 so that the axis passing through the center of the annular groove g of the work W is aligned with the axis of the grinding wheel 16. (In the present embodiment, 2 to 3 degrees). Next, the table drive servomotor 14 is driven to move the table 12 toward the work W. Then, the work W and the grinding wheel 16 are rotated,
As shown in FIG. 2, an annular groove g of the workpiece W is ground at the leading edge thereof while giving a cutting feed to the grinding wheel 16.

Since the grinding wheel 16 has the same diameter (D = Dw) as the diameter (Dw) of the annular groove g of the work W, there is little interference with the annular groove g as in the conventional method, and a large grinding wheel is used. can do. Further, since the axis of the work W is inclined by θ ° with respect to the axis of the grinding wheel 16, the contact area between the grinding wheel 16 and the work W is small, and sufficient coolant can be supplied to the processing portion. For this reason, the processing efficiency is good and the life of the grinding wheel is prolonged.

In the above-described embodiment, the axis of the workpiece W is inclined by θ ° with respect to the axis of the grinding wheel 16. On the contrary, as shown in FIG. The same operation and effect can be obtained by inclining by θ ° with respect to the axis of W.

[0019]

As is apparent from the above description, according to the present invention, the leading edge of the cross section having the same diameter as the annular groove of the workpiece and having the same shape as the groove cross section of the annular groove is formed. The axis of the cup-shaped grindstone having the workpiece is inclined relative to an axis passing through the center of the annular groove of the work, and the annular groove of the work is ground at the leading edge of the cup-shaped grindstone. In this way, it is possible to use a grindstone having a large grindstone diameter, good grindstone processing efficiency, and prolong the life of the grindstone.

[Brief description of the drawings]

FIG. 1 is a plan view of a grinding apparatus for carrying out a method for grinding an annular groove according to the present invention.

FIG. 2 is an enlarged view illustrating a method of performing grinding by inclining an axis of a work with respect to an axis of a grinding wheel in the apparatus of FIG. 1;

FIG. 3 is an enlarged view for explaining a method of performing grinding by inclining the axis of the grinding wheel with respect to the axis of the work in the apparatus of FIG. 1;

FIG. 4 is a sectional view showing a conventional annular groove grinding method.

FIG. 5 is a right side view of FIG.

[Explanation of symbols]

 W Work g Annular groove 16 Grinding wheel

Claims (1)

[Claims] 1. A method for grinding an annular groove on an end face of a work using a grinding wheel, wherein the annular groove has the same diameter as the diameter of the annular groove of the work, and a groove cross section of the annular groove. The axis of a cup-shaped grindstone having a tip edge having the same cross-section as that of the workpiece is inclined relative to an axis passing through the center of the annular groove of the work, and the annular groove of the work is ground at the tip edge of the cup-shaped grindstone. A grinding method for an annular groove, characterized in that: