SU775954A1 - Device for supporting steel parts such as bodies of revolution for centerless machining - Google Patents

Description

The invention relates to the field of abrasive processing and can be used for centerless grinding of rolling bearing rings based on axial or radial bearings. ⁵

A device for basing parts such as bodies of revolution during centerless machining on rigid axial and radial bearings made in the form of carbide shoes G1 EN The disadvantage of this device is the instability of rotation with cases of complete stop of the product, rel. Relatively fast wear of supports, the formation of soda on the product.

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The purpose of the invention is to increase the stability of rotation of parts. 20

This goal is achieved in that at least one of the supports is made of polycrystals based on cubic boron nitride.

In FIG. 1 shows an end view of one of the modifications of the device; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 ~ modification of the device of FIG. 2; in FIG. 4 is a section BB in FIG. 3; in FIG. 5 view in the context of another modification of the device; in FIG. 6- section BB in FIG. 5.

The device (Fig. 1 and 2) is designed to base and rotate the product 1, in this case, the outer ring of a miniature rolling bearing, for example, in a machine for grinding the groove of the ring with an abrasive wheel 2, mounted on a mandrel 3 ·

The device is equipped with a base 4, on which, for example, an axial chamber 5 is fixed with glue in the form of a disk or cylinder of polycrystals based on cubic boron nitride and a radial support 6 in the form of a prism or sector of the same material, as well.

the same rollers 7 and 8 mounted on the spindles (spindles not shown in the drawing) and interacting with the product 1.

For processing (Fig. 3.4) of larger parts, the disk 5 is replaced by several supporting elements Y in the form of cylinders, the ends of which form the base surface for the end face of the product 1.

For axial basing and product management (Fig. 5,6), the device is equipped with a magnetic cartridge 10 with poles 11, 12 and a diamagnetic spacer 1.3. At the leading end of the cartridge, supports 14 of polycrystals based on cubic boron nitride are fixed. For the radial base of the product 15 (in this case, the inner ring of the bearing), a mandrel 16 with radial bearings 17 and 18, also made of polycrystals based on cubic boron nitride, is provided, and the circle 2 is replaced by an abrasive bar 19.

Attaching supports to their supporting elements is possible by any known means, however, glue fastening with ED-5 resin with the addition of polyethylene-polyamine, triethanolamine with exposure at - £ -1Д0 ° С for 1 h and subsequent cooling in air is preferable.

The device operates as follows.

Item 1 of FIG. (1-4) is based on the end face on the axial support 5 (or on the axial support 9) and on the periphery on the radial support 6 and '. It is driven into rotation by the rollers 7 and 8. During the processing of the product with tool 2, the end of the product slides along the axial supports and the periphery of the radial bearings 6. The product 15 at the end (Fig. 5,6) is based on the support 14 of the magnetic cartridge 10, and the hole on the radial support 17, 18 of the mandrel 16. In this case, the support 14

775954 ₄ provide the necessary slippage of the end face of the ring 15 relative to the end face of the cartridge.

In all the described modifications _5, due to the proposed choice of the material of the supports, more precisely the combination of the materials of the supports and the workpiece (elbor P - steel), the rotation stability is increased while reducing the wear of the supports and nats on the base surfaces of the products. The manufacture of supports from Elbor P provides an unexpected high effect in terms of increasing the stability of rotation of parts on the supports and reducing wear of the supports: for example, diamond supports significantly exceeding the supports from Elbor P in terms of hardness and commensurable in terms of friction coefficient, in terms of the achieved stability of rotation and resistance of the supports significantly worse supports from Elbor R.

In any devices where the material of one of the parts of the rubbing pair is steel, replacing the material of the second part of the rubbing pair (diamond, carbide, etc.) with elbor P gives a similar effect.

Claims (1)

Same roller: 7 and 8 mounted on spindle x (no spindles shown in the drawing) and interacting with item 1, For machining (Fig. 3, larger parts), disk 5 is replaced by several support elements Y — in the form of cylinders the ends of which form the base surface for the end of the product 1, for axially positioning and guiding the product (Fig. 5.6), the device is equipped with a magnetic cartridge 10 with leads 11, 12 and a diamagnetic spacer 1.3. Polycrystal supports 14 are fixed at the leading end of the cartridge based on cubic boron nitride for radial b The product 15 (in this case, the inner bearing ring) is provided with a mandrel 1b with radial supports 17 and 18, also made of polycrystals based on cubic boron nitride, and the circle 2 is replaced with an abrasive bar 19. Fastening the supports to their supporting elements is possible By any known means, however, it is preferable to glue with resin with additions of polyethylene-polyamine, triethanolamine with a holding at fl40 ° C for 1 hour and then air-cooling. The device works as follows. Item 1 of FIG. () is based on the end on the axial support 5 (or on, axial supports 9) and on the periphery on the radial support 6 and is driven into rotation by the rollers 7 and 8. on the radial supports 6. The product 15 in accordance with the diagram (fig. 5.6) is based on the supports of the magnetic cartridge 10, and on the opening on the radial supports 17, 18 of the mandrel 16. the end of the cartridge. In all the described modifications, due to the proposed choice of support material, more precisely the combination of support materials and the workpiece (Elbor P - Steel), the rotational stability is improved while reducing the wear of supports and soda on the base surfaces of products. The production of elbor P supports ensures an unexpectedly high effect in terms of increasing the stability of parts on the supports and reducing the wear of supports: for example, diamond supports significantly exceeding the supports of elbor P in hardness and commensurate in friction coefficient, in achievable stability of rotation and stability of the supports significantly worse than elbor R. supports. In any devices, where the material of one of the parts is made of steel, the replacement of the material of the second part of the pair (diamond, hard alloy, etc.) is an elbor m P gives a similar effect. Claims An apparatus for locating steel parts such as rotation bodies with a centerless machining, containing rigid axial and / or radial bearings, which, in order to increase the stability of the parts rotation, at least one olor is made of polycrystals based on cubic nitride Bora, Sources of information taken into account during the examination 1. USSR author's certificate W 465870, class, В 24 В 47 / DO, 1971. Aja (PU2.2 Fug, 3 Phage. four fO / V v D / R s | D15 FIG. five sh 15 FIG. 6