Extrusion forming manufacturing method for inner race of integral type titanium alloy self-lubricating spherical plain bearing

Abstract

The invention discloses an extrusion forming manufacturing method for an inner race of an integral type titanium alloy self-lubricating spherical plain bearing. The method comprises the following steps: firstly machining a titanium outer race for the spherical plain bearing according to the requirement, and adhering a self-lubricating layer on the inner surface of the outer race to form a finished bearing outer face; secondly, conducting obturated-extrusion forming on a blank of the bearing inner race through an obturated-extrusion die; thirdly, machining a workpiece into an inner race middle forming piece which is provided with a cylindrical hole of certain size, wherein the diameter of the hole is smaller than that of an inner hole of a finished spherical plain bearing inner race; fourthly, conducting upset-extrusion forming on the inner race middle forming piece through an upset-extrusion die, and assembling the inner race and the outer race while conducting the upset-extrusion forming; and fifthly, grinding two end faces and the cylindrical hole of the inner race for assembling the inner race and the outer race of the bearing to obtain the finished self-lubricating spherical plain bearing. The extrusion forming manufacturing method is applicable to the self-lubricating spherical plain bearing with the titanium alloy outer race and the copper alloy inner race, and the manufactured bearing is long in service life and high in reliability.

Description

technical field [0001] The invention relates to a manufacturing method of a self-lubricating joint bearing, in particular to a manufacturing method of an integral self-lubricating joint bearing of a titanium alloy outer ring-copper alloy inner ring. Background technique [0002] The integral 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 adhered to the inner surface of the outer ring. The integral titanium alloy self-lubricating joint bearing is different from the integral steel structure joint bearing. Its outer ring is made of titanium alloy and the inner ring is copper alloy. The titanium alloy is light in weight and high in specific strength, and the copper alloy has good thermal conductivity. In aerospace equipment, integral titanium alloy self-lubricating joint bearings have good application prospects. [0003] However, the manufacturing process of...

AI Technical Summary

Problems solved by technology

In the processing process of this method, the upper and lower diameters of the inner ring are not synchronized, and the deformation is not uniform, which makes the process difficult to control; the other process is to use a solid cylindrical billet and extrude the end face of the billet, so that the approximate elliptic line contour surface gradually Deform to the spherical surface until the blank completely fills the outer ring, and then drill the inner ring according to the middle hole requirements of the inner ring

In this method, the core of the billet is prone to uneven cracks, and the extrusion force is too large, which is difficult to control. If this process is used for a bearing with a self-lubricating layer, it is easy to cause damage to the self-lubricating layer or deformation of the inner ring.

At the same time, in the above two forming methods, the inner and outer rings are too tight or locked during the processing process, so it is not suitable for processing integral titanium alloy joint bearings with self-lubricating layers

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