Compression molding method without action of inner rings for integral self-lubricating joint bearings

Abstract

The invention relates to a compression molding method without action of inner rings for integral self-lubricating joint bearings. The compression molding method is characterized in that a self-lubricating layer is adhered on the inner surface of an outer ring blank, a bearing inner ring is placed in the outer ring blank adhered with the self-lubricating layer, a combination of the bearing inner ring and the outer ring blank is sleeved on a central spindle in a cavity of a lower mold, both a cavity of an upper mold and the cavity of the lower mode consist of conical surfaces and cylindrical holes, a chamfer matching with the conical surfaces of the cavities is arranged on a width end surface of the outer ring blank, a compression molding process is precisely controlled according to a pressing time-displacement curve, when the upper mold reaches a target position and an inner spherical surface is formed on the inner surface of the outer ring blank, compression molding is stopped, molds are opened, and a self-lubricating joint bearing meeting the requirement on the backlash is obtained. The compression molding method solves the problem that a self-lubricating layer of an integral self-lubricating joint bearing is damaged by existing forming process, a forming process of the inner surface of an outer ring of the bearing and the backlash of the bearing are controllable, and the bearing manufactured by the aid of the process has the advantages of long service life and high reliability.

Description

technical field [0001] The invention relates to the field of bearing manufacturing, in particular to a compression molding method of a joint bearing. Background technique [0002] At present, the known self-lubricating joint bearing is composed of an inner ring with an outer spherical surface, an outer ring with an inner spherical surface and a self-lubricating layer. According to the structure of the outer ring, it is divided into: single-slit type, double-slit type, double-half type and integral type. The self-lubricating layer on the inner spherical surface of the outer ring is the key functional structure of the bearing. Whether it is damaged during manufacturing has a great impact on its performance. decisive role. Although the inner surface of the single-slit self-lubricating spherical plain bearing is easy to manufacture, the inner ring can be directly pressed into the outer ring with the slit during assembly, but it is very easy to cause damage to the self-lubricati...

AI Technical Summary

Problems solved by technology

Although the inner surface of the single-slit self-lubricating spherical plain bearing is easy to manufacture, the inner ring can be directly pressed into the outer ring with the slit during assembly, but it is very easy to cause damage to the self-lubricating layer on the inner surface of the outer ring and the outer surface of the inner ring. , in use, the uneven stress caused by the slit reduces the bearing life and reliability; although the double-slit self-lubricating joint bearing does not damage the lubricating layer during manufacturing, the surface of the outer ring and the self-lubricating layer are cut In use, the non-integral structure makes the gap uneven, the force uneven, the reliability is low, and the assembly structure is relatively complicated; the double half self-lubricating joint bearing is connected by several bolts to the two half outer rings, The structure is complex and the assembly requirements are high. The two halves of the outer ring and the self-lubricating layer are also non-integral structures, with uneven gaps and uneven forces. Moreover, this structure is not suitable for small self-lubricating spherical plain bearings and has low reliability.

[0003] The outer ring and the self-lubricating layer of the integral self-lubricating spherical plain bearing are an integral structure. The outer ring and inner ring have a simple structure, and the clearance conditions meet the requirements of the finished bearing. The reliability is high in use. The existing manufacturing technology uses the forging method for the outer ring Envelope forming on the inner ring, when the outer ring is formed, the inner ring is first put on the mandrel, and then the outer ring blank is placed outside the inner ring, and then the outer ring is pressed so that the inner surface of the outer ring locks the outer ring of the inner ring. On the spherical surface, and then machine the outer ring, by controlling the interference between the mandrel and the inner ring ["Bearing" 1973, (6)], there is a gap between the self-lubricating layer and the outer surface of the inner ring, that is, the self-lubricating spherical plain bearing Clearance, in the manufacturing process of integral self-lubricating spherical plain bearings, in order to form the inner spherical surface of the outer ring and the bearing clearance that meets the requirements of the finished bearing, the self-lubricating layer undergoes two non-uniform and severe extrusion and deformation, which can easily cause compression Therefore, in the manufacture of integral self-lubricating spherical plain bearings, the development of forming technology without inner ring action is necessary

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