JPS5936371Y2 - Round groove and stone wheel forming equipment - Google Patents

Description

[Detailed description of the invention] This invention is used for plunge grinding grooves with a circular cross section, such as the raceway grooves of the inner and outer rings of ball bearings, and the outer peripheral surface of the stone wheel is adapted to the cross-sectional shape of the groove. This relates to an apparatus for forming into a circular shape.

In recent years, as ball bearings have become lighter and thinner, have higher loads, and higher rotation speeds, we have been able to suppress the shortening of life caused by flaking of the raceway groove surfaces of the inner and outer rings and the phenomena where the balls ride on the shoulders of the raceway groove, and to further extend the life of ball bearings. In order to extend the service life, it is known to form the cross-sectional shape of the raceway groove into a circular shape.

However, the current state of the machine for forming this round shape is either a copying machine that uses a primitive method to obtain a round shape when a cylinder is cut diagonally, or an expensive numerical control method that uses a pulse motor. However, there was nothing that was satisfactory in terms of accuracy or cost.

In view of the above-mentioned current situation, the present invention aims to provide a round groove and stone wheel forming device that is simple in structure, inexpensive, and highly accurate.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram explaining the principle of creation of a circular shape in the device of the present invention, in which the distance between a point A moving left and right on the X-axis and a point B moving up and down on the Y-axis is determined by AB=e. Assuming that point C on the line connecting AB is in a constant relationship AC = r = the locus of point C when A and B move on the XY axes is such that the major axis (Y axis) is 2r, The minor axis (X axis) is 2 (r
-e) It is well known to draw a circle.

Therefore, point A is set as the center of rotation, and point A is set as the center point of the eccentric cam 2 having eccentricity e, which is fixed to the turning shaft such that point A slides on the X axis.

On the other hand, it is assumed that a diamond dresser is provided on the above-mentioned rotating shaft, and the dressing point of the diamond dresser is the above-mentioned point C.

Then, the cam surface 21 of the eccentric cam 2 is connected to the surface 6 of the stopper 6.
1 so that the center point B of the eccentric cam 2 always lies on the Y axis.

Such a structure is the principle structure of the device of the present invention.

Next, a specific structural example thereof will be explained.

In the embodiment shown in FIGS. 2 and 3, the pivot shaft 1 is rotatably supported in the housing 4 by bearings 8, 8, and an eccentric cam 2 is fixed to one end thereof, and a dresser 3 is fixed to the other end. It is.

The eccentric cam 2 is a circular cam whose eccentricity is e.

Further, the distance between the dressing point 31 of the dresser 3 and the axis of the turning shaft 1 is adjusted and fixed to a predetermined turning radius r.

The housing 4 has a dovetail 51 formed on the base 5.
As shown in FIG. 3, the cam surface 21 of the eccentric cam 2 comes into contact with the surface 61 of the stopper 6 provided on the base 5.

On the other hand, the base 5 is provided with a spring receiver 52, and the spring 7 bridged between the spring receiver 52 and the housing 4 always pushes the housing 4 toward the stopper 6.
The cam surface 21 of the eccentric cam 2 is always connected to the surface 61 of the stopper 6.
It has come to be in close contact with

In one embodiment of the present invention having the above structure, when the pivot shaft 1 is pivoted left and right by a known pivoting means (not shown), the dress point 31 is aligned with the locus of the point C according to the principle described above, that is, the major axis is 2r and the minor axis is 2r. A circle is drawn in which r is 2 (r = e), and the outer peripheral surface of the stone S is molded and dressed into the above-mentioned circle shape.

In this embodiment, the housing 4 fits into the dovetail 51 formed on the base 5 and slides left and right. However, the housing 4 is not limited to this, and other sliding mechanisms may be used. Alternatively, the housing 4 may be suspended and supported on the base 5 by parallel springs 9, 9 as shown in FIG.

Alternatively, as shown in FIG. 5 or FIG. 6, respectively, the housing 4 may be pivotably supported on the base 5 so as to be rotatable within a plane including the axis of the pivot shaft 1.

That is, in the case shown in FIG. 5, a pivot shaft 10 provided in a housing 4 is rotatably supported by a bearing on a base 5, and in the case shown in FIG. and insert the pivot pin 11. into the corresponding part.
11 is implanted and pivot-supported.

It goes without saying that each of these structures embodies the above-mentioned Daen creation principle and fundamental structure.

As mentioned above, the round groove and stone wheel forming device of the present invention is the first
Since the structure is based on the principle of creating a circular shape as shown in the figure, the structure is much simpler than the conventional one, and the unit can be made highly accurate and compact.

It can also be easily installed on a general-purpose grinder.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of creation of a circular shape in the device of the present invention, Fig. 2 is a vertical sectional view showing an embodiment of the device of the present invention, Fig. 3 is a side view of Fig. 2, and Fig. 4 is FIG. 5 is a plan view showing another embodiment of the present invention, FIG. 5 is a partially sectional view showing still another embodiment, and FIG. 6 is a partially sectional view showing still another embodiment. Explanation of symbols, 1... Rotating axis, 2... Eccentric cam, 3... Dresser, 4... Housing, 5... Base , 6... Stopper, 9... Parallel spring, 10... Pivot shaft, 11... Pivot pin, S...
and stone.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A device for grinding and shaping the outer peripheral surface of a stone wheel for circular groove plunge grinding, which comprises an eccentric cam fixed to the pivot shaft of a dresser that rotates and swings with a constant radius of curvature; , comprising a housing rotatably supporting the pivot shaft, a base supporting the housing, a stopper fixed to the base, and an elastic member constantly bringing the cam surface of the eccentric cam into close contact with the stopper. A stone wheel forming device for circular grooves and stone wheels, characterized in that when the pivot shaft is pivoted and swung, the housing is moved in one direction with respect to the base by the lifting action of the eccentric cam. 2. Utility model registration claim 1, in which the housing rotatably supports the pivot shaft is supported on the base so as to be slidable in a direction perpendicular to the axis of the pivot shaft.
Machine for forming circular grooves and stone wheels as described in Section 1. 3. The housing according to claim 1 of the utility model registration claim, wherein the housing rotatably supports the pivot shaft and is pivotably supported on the base so as to be rotatable within a plane including the axis of the pivot shaft. Groove and stone wheel forming equipment.