JPS6319304B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing method for wrapping the surface of a spherical body such as a ball used in a bearing. In particular, the present invention relates to a processing method for wrapping the surface of a spherical body such as a ball used in a bearing. In particular, the present invention relates to a processing method for wrapping the surface of a spherical body such as a ball used in a bearing. The purpose of this paper is to provide a processing method to obtain the desired results.

As a method for wrapping this kind of sphere, the method shown in FIG. 1 has conventionally been used.
That is, annular grooves 4a, 4b, 5a, 5b having the same arrangement relationship on the respective front surfaces 2a, 3a and having arcuate surfaces with the same curvature as the curvature of the sphere 1, which is the workpiece.
A rotary plate 2 and a surface plate 3 having several grooves formed thereon are arranged facing each other, and each opposing annular groove 4a, 5a, 4b, 5
A plurality of spheres 1, 1... are placed in b, and the surface plate 3 is pressed against the rotary plate 4 with a constant pressure F.
The wrapping process was performed on spheres 1, 1, etc. by rotating them.

In this processing method, it is practically impossible to wrap each sphere 1 by placing it between the rotary plate 2 and the surface plate 3 because an unreasonable load is applied to the sphere 1 and the device, and it is usually impossible to wrap the sphere 1 individually. is rotary plate 2 and surface plate 3
A large number of spheres 1, 1, . . . are inserted between each groove 4a, 5a, 4b, 5b, and a large number of spheres are processed at the same time. As a result, the polishing force acting on each sphere 1, 1, . . . is dispersed, resulting in the disadvantage that it takes several hours to wrap the spheres 1 by several μm.

In addition, in the above processing method, the rotary plate 2 and the surface plate 3
The arc shape of each annular groove 4a, 4b, 5a, 5b is formed to match the curvature of a specific sphere 1, so that the diameter of the sphere 1 to be machined is
When wrapping other spheres with a diameter difference of 10 μm or more, for example, if the sphere is small in diameter, the second
As shown in the figure, the sphere 6 is connected to each annular groove 4a, 5a, 4.
b, 5b, and the difference in curvature between the two prevents sufficient contact with the sphere 6, making it impossible to perform high-precision wrapping.On the other hand, in the case of a large-diameter sphere 7,
As shown in FIG.
They protruded from a, 4b, and 5b, and as in the case described above, sufficient contact could not be achieved, making it impossible to perform highly accurate wrapping, and requiring a rotary plate and a surface plate according to the diameter of each sphere.

Therefore, in the conventional processing method mentioned above, the nominal size difference is
It was not possible to wrap several spheres with a diameter of 10 μm or more continuously within a unit time, resulting in extremely poor workability.

In view of the above-mentioned conventional drawbacks, the present invention is a processing method that improves and eliminates the drawbacks. A presser plate having a hole in the center, a concave spherical surface portion having a diameter larger than the entrance diameter of the concave spherical surface portion of the saucer wrap on the lower periphery of the hole, and a holding rod with a pointed end on the upper end surface. are placed facing each other, a sphere as a workpiece is interposed between the saucer wrap and the push plate, rotation is given to the saucer wrap, and the push plate is pressed against the sphere through an elastic body with a constant pressure. The wrapping process is performed by swinging within a swing angle such that the end portion contacts the saucer lap, thereby making it possible to individually wrap spheres having different nominal size differences in a short time.

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

In FIG. 4, reference numeral 11 denotes a saucer wrap, which has a hole 12 of an appropriate diameter formed in the center of its upper end surface, and a support concave spherical surface portion 13 on the upper periphery of the hole 12 that supports the sphere 10 that is the workpiece. is formed, and the lower part is connected and supported by a suitable rotational drive device (not shown). 14 is a push plate with a hole 15 in the center of the lower end surface.
A concave spherical presser portion 16 for pressing the sphere 10 is formed at the lower peripheral edge of the hole 15, and a holding rod 17 having an acutely pointed end 17a is integrally formed at the center of the upper surface. The pressing plate 14 has an inlet diameter D ₂ of the presser concave spherical part 16 on the lower surface side, which is larger than the inlet diameter D ₁ of the support concave spherical part 13 on the upper surface side of the receiving plate wrap 11, so as to reduce the contact area with the sphere 10. It is made larger than the contact area of the saucer wrap 11 with the sphere 10. Reference numeral 18 denotes a cylinder that presses the pressing plate 14 against the sphere 10 and rotatably holds it, and a holding member 2 is attached to the lower end of the cylinder via an elastic body 19.
0 are connected together. A conical recess 21 is formed in the center of the lower surface of the holding member 20, and the end 17a of the holding rod 17 of the push plate 14 is inserted into this recess 21, and the pointed ends are connected by making point contact. be. Therefore, the pushing plate 14 receives the pressing force of the cylinder 18 via the elastic body 19, the holding member 20, and the holding rod 17, and also receives the pressing force of the cylinder 18 through the elastic body 19, the holding member 20, and the holding rod 17.
It is held rotatably about the point of contact with the sphere 10 as a fulcrum, and can rotate with the sphere 10. Further, the cylinder 18 is connected to the press plate 1 by an appropriate means (not shown).
4 are supported so as to be able to swing within a range of swing angle θ such that one end portion 22 of each tray wrap 11 comes into contact with the upper surface of the tray wrap 11. The pivot point is set so that the pusher plate 14 presses the sphere 10 at an appropriate angle _θ1 .

In the above structure, the processing method will be described. The sphere 10 is placed on the supporting concave spherical surface part 13 of the saucer wrap 11, and the presser concave spherical surface part 16 of the press plate 14 is brought into contact with the sphere 10 by operating the cylinder 18. let me,
A constant pressing force is applied from a direction tilted at a predetermined angle θ ₁ . In this state, the saucer wrap 11 is rotated and the cylinder 18 is swung within a predetermined range. Then, as the saucer wrap 11 rotates, the sphere 10 and the pusher plate 14 supported thereon simultaneously rotate, but at this time, the direction of rotation of the saucer wrap 11 and the rotation direction of the pusher plate 14 are different, and furthermore, the direction of rotation of the saucer wrap 11 and the pusher plate 14 are different. The contact area with the push plate 14 is larger than the contact area with the saucer wrap 11, and the sphere 10 follows the push plate 14 and rotates with the push plate 14.
Sliding occurs between the contact surfaces with the supporting concave spherical surface portion 13 of the sphere 10, and this sliding portion of the sphere 10 is subjected to a wrapping process. At the same time, due to the rocking motion of the cylinder 18, the press plate 14 connected thereto also rocks, and the spherical body 10
The push plate 14 also rotates in the swinging direction, and the wrapping position of the receiving plate wrap 11 changes. Then, when the cylinder 18 is tilted by the maximum angle θ, the end 22 of the presser plate 14 comes into contact with the upper surface of the saucer wrap 11, as shown in FIG. A slight gap is created between the ball 10 and the ball 10, which rotates with the saucer wrap 11.
The wrapping process is temporarily stopped. After this, when the cylinder 18 swings back, the presser concave spherical surface part 16 of the presser plate 14 comes into contact with the sphere 10 again, and as a result, the sphere 10 rotates with the presser plate 14, and the receiver lap 1
Wrapping is done at the sliding part with 1. At this time, the contact position between the presser concave spherical surface part 16 of the press plate 14 and the sphere 10 is different from the previous contact position, and the sphere 10 is different from the previous contact position.
The new part is wrapped. Therefore, by repeatedly rocking the cylinder 18 and the push plate 14 several times, the entire surface of the sphere 10 is wrapped, and a highly accurate sphere can be obtained.

According to the above processing method, the wrapping pressure of the saucer wrap 11 is concentrated on a single sphere 10, so the wrapping ability is high. is pressed with a constant pressure, and even if the sphere 10 etc. shakes during processing, this shake is absorbed by the elastic body 19 and the cylinder 18 that presses with a constant pressure, and the sphere 10 of the pressing plate 14 There is no possibility that the pressing force will be higher in some areas and the sphericity will be lowered due to more wrapping in that area, and since the pushing plate 14 is oscillated, the entire area will be processed smoothly. By increasing the swinging speed, wrapping efficiency can be improved, and highly accurate spheres can be processed in a short time.

In addition, in the above processing method, the supporting concave spherical surface portion 13 of the saucer wrap 11 and the presser concave spherical surface portion 1 of the presser tray 14 are
6 have holes 12 and 15 in the center and are formed to an appropriate width, so the sphere 10 is most suitable for this.
It adapts immediately to a sphere whose diameter is significantly different from 30 to 50 μm, and the sphere has a supporting concave spherical surface part 13.
Since sufficient contact pressure with the concave spherical portion 16 of the presser foot can be obtained, wrapping processing can be performed immediately. Therefore, by plating bearing steel balls and wrapping them, balls having arbitrary nominal size differences can be individually and continuously processed in a unit time.

Incidentally, if the saucer wrap 11 is replaced with a grindstone, polishing can also be performed.

As explained above, the present invention has a hole at the center of the upper end surface, a workpiece is placed on a saucer wrap which has a concave spherical surface on the upper periphery of the hole, and a workpiece is placed on a tray wrap that has a hole at the center of the lower end surface. A concave spherical surface portion having a diameter larger than the entrance diameter of the concave spherical surface portion of the saucer lap is formed at the lower peripheral edge of the hole, and a presser plate having a holding rod with a pointed end on the upper end surface is attached to the workpiece. Processing is carried out by applying rotation to the saucer wrap and pressing the pusher plate against the workpiece through an elastic body with a constant pressure, while swinging within a swing angle such that its end comes into contact with the saucer wrap. Since the spheres are processed individually, highly accurate spheres can be obtained in a short time, and spheres with a diameter difference of 10 μm or more can be processed instantly, and any nominal size can be processed. Difference spheres can be obtained individually and continuously in a unit time, greatly improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view explaining the conventional method for wrapping a sphere, FIGS. 2 and 3 are schematic cross-sectional views explaining the drawbacks of the conventional method, and FIG. 4 is a process for processing a sphere according to the present invention. FIG. 5 is a cross-sectional view of a main part showing one embodiment of the method, and FIG. 5 is a cross-sectional view showing an example of the operation. 10... Sphere (workpiece), 11... Receiver wrap, 12, 15... Hole, 13... Support concave spherical part, 14... Press plate, 16... Presser concave spherical part, 1
7... Holding rod, 18... Cylinder, 19... Elastic body, 20... Holding member.

Claims (1)

[Claims] 1. Place the workpiece on a saucer wrap that has a hole in the center of the upper end surface and a concave spherical surface on the upper periphery of the hole, and has a hole in the center of the lower end surface and a concave spherical part on the upper periphery of the hole. A presser plate having a concave spherical portion having a diameter larger than the entrance diameter of the concave spherical portion of the saucer wrap and having a holding rod with a pointed end on the upper end surface is placed over the workpiece to impart rotation to the saucer wrap. In addition, the pressing plate is pressed against the workpiece side through an elastic body with a constant pressure, and the processing is performed by swinging within a swinging angle such that the end portion contacts the receiving plate lap. How to process a sphere.