JPS6320535Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a sphere grinding device suitable for finishing a wide variety of small quantities of spheres.

[Technical background of the invention and its problems]

Generally, spheres such as steel balls used in ball bearings are produced by wrapping. In this case, wrapping is performed by inserting a large number of elementary spheres between two wraps, rotating them, processing the entire surface stochastically, and gradually scraping away parts with larger diameters to make them closer to a true sphere. be exposed.

However, the production of spheres by wrapping
Finishing efficiency is extremely low. Furthermore, while it is advantageous when producing a large number of spheres of the same size that are processed in the same way, it is unsuitable for producing a wide variety of products in small quantities, and has the disadvantage of decreasing productivity.

[Purpose of invention]

The present invention was made in consideration of the above circumstances, and an object of the present invention is to provide a sphere grinding device that can produce a wide variety of spheres in small quantities with high efficiency.

[Summary of the idea]

A holding groove is formed in the circumferential direction of the cylindrical roller,
The elementary sphere placed on the top of this holding groove is positioned and held by a support, and the held elementary sphere is moved by a grinding wheel whose outer circumferential surface serves as a grinding surface so that the grinding direction at the grinding point is adjusted by the roller. Grinding is performed in a direction perpendicular to the direction of rotation of the sphere.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

The figure shows the spherical grinding device of this embodiment.
This spherical grinding device consists of a base 1, a cover-shaped support 3 mounted on the base 1 and having a circular hole 2 in its upper part, and a circular A columnar V-groove roller 4 is connected to one of a pair of rotating shafts 4a, 4a, which are fixed on the base 1 adjacent to the support 3 and protrude coaxially from both ends of the support 3.
It has a first motor 5 that rotationally drives the grooved roller 4, a grinding wheel 6 such as a diamond grindstone provided directly above the through hole 2, and a second motor (not shown) that rotationally drives the grinding wheel 6. It is composed of a grinding mechanism 7. However, the above base 1
is detachably fixed to an electromagnetic chuck C that can be moved up and down in the vertical direction. In addition, the V-groove roller 4 is
A V-groove 8 having a V-shaped cross section is formed in the circumferential direction, and the V-groove 8 is set directly below the through hole 2 . In this V-groove roller 4, at least the V-groove 8 portion is made of a wear-resistant metal such as cemented carbide. Thus, the elementary sphere 9 made of, for example, silicon nitride to be ground is held in a fixed position by the V-groove 8 and the through hole 2. Further, the grinding wheel 6 includes a cylindrical holding plate 10 and a diamond abrasive grain layer 11 formed on the outer peripheral surface of this holding plate 10. This grinding wheel 6 is disposed at a position where its diamond abrasive grain layer 11 comes into contact with the elementary sphere 9 in the through hole 2. The rotation axis 6a of this grinding wheel 6 is perpendicular to the plane of the paper in the figure, and the rotation axis 4a of the V-groove roller 4 is oriented in the left-right direction of the plane of the paper. That is, a plane perpendicular to the rotating shaft 4a and a plane perpendicular to the rotating shaft 6a are perpendicular to each other, and the grinding wheel 6 is provided so that the elementary sphere 9 is ground in the axial direction of the V-groove roller 4.

In the sphere grinding apparatus having the above configuration, with the base 1 removed from the electromagnetic chuck 7, the elementary sphere 9 is inserted into the through hole 2 of the support 3 and placed on the V-groove 8.
Next, the base 1 is fixed to the electromagnetic chuck C so that the elementary spheres 9 are directly below the diamond abrasive grain layer 11. At this time, the rotating shaft 4a and the rotating shaft 6a are set to be parallel to the upper surface of the base 1 and perpendicular to each other. Then, by raising the electromagnetic chuck C, the elementary spheres 9 are placed on the diamond abrasive grain layer 11.
contact. Then, the first motor 5 and the second motor 5
The motor is started to rotate the grinding wheel 6 and the V-groove roller 4 in the directions of arrows 12 and 13, respectively.
For example, the grinding wheel 6 at this time has a diameter of 200 mm.
mm and rotates at 1500 revolutions per minute. On the other hand,
The V-groove roller 4 is rotated at 50 revolutions per minute. As a result, a rotational force in the direction of arrow 12 and a rotational force in the direction of arrow 13 perpendicular to this act on the elementary sphere 9, and the entire surface of the elementary sphere 9 is ground and finished. That is,
The elementary sphere 9 is probabilistically processed by the grinding wheel 6, and portions with larger diameters are gradually removed to obtain a true sphere.

In this way, the sphere grinding apparatus of this embodiment can easily and quickly finish finish each elementary sphere one by one. Therefore, it is suitable for processing a wide variety of small quantities of spheres.

In the above embodiment, the roller 4 having a V-groove 8 is used, but the groove shape may be any shape, such as a U-groove, square groove, semicircular groove, etc., as long as it can hold the elementary sphere. It may have a shape like this. Further, a plurality of V grooves may be provided on the outer peripheral surface of the roller 4. Further, the direction of the rotation axis 6a of the grinding wheel 6 and the direction of the rotation axis 4a of the roller 4 are not limited to being perpendicular to each other, but may be set at any angle as long as they are not parallel. That is, as long as the grinding direction at the grinding point intersects with the rotation direction of the elementary sphere by the roller, it may be set at any angle. Furthermore, base 1
Instead of supporting the electromagnetic chuck, the base 1
may be fixed to the table from the beginning, and one or both of the table side and the grinding wheel 6 side may be moved up and down. Further, the V-groove roller 4 may be supported by an independent support other than the support 3. Furthermore, the through hole 2 of the support body 3 may be a square hole instead of a circular hole, and furthermore, it is not limited to a hole, and may be supported by a frame.

[Effect of idea]

The sphere grinding device of the present invention can easily, quickly, and inexpensively finish the elementary spheres one by one. Therefore, it is suitable for processing a wide variety of small quantities of spheres.

[Brief explanation of the drawing]

The figure is an overall configuration diagram of a sphere grinding device according to an embodiment of the present invention. 3: Support body, 4: (V groove) roller, 5: First motor (rotation drive mechanism), 6: Grinding wheel, 7: Grinding mechanism, 8: V groove (holding groove).

Claims (1)

[Scope of utility model registration request] a cylindrical roller in which a holding groove is formed in the circumferential direction; a rotation drive mechanism that rotates the roller with its axis as a rotational axis; a support body that positions and holds a sphere placed on the top of the holding groove; The outer circumferential surface of the grinding surface is a grinding surface, and the grinding wheel is disposed above the support. A sphere grinding device comprising: a grinding mechanism that performs grinding in a direction intersecting the direction of rotation of the sphere by the roller at the contact point.