Patent ID: 7954241

Claim:
A manufacturing process for making self-lubricating bearings, comprising the following steps: placing processed spherical particles of a multiple of alloys evenly into a multiple of round cavities provided in a molding mold made of low heat expansion coefficient material and each center of each cavity is provided with a core bar made of low heat expansion coefficient material so as to form a hollow cylindrical green body; placing the molding mold with a multiple of hollow cylindrical green bodies into a sintering furnace with flowing protective atmosphere, which is then heated below two thirds of the melting temperature of the alloys' main constituent for 10 to 20 minutes, such that the spherical alloy particles can be sintered together and form a sintered body with large pores; shaping the hollow cylindrical sintered bodies after cooling down into a cavity of a steel extruding mold and extruded therein to shape the sintered bodies into semi-finished bearings with satisfactory roundness, surface roughness, and concentricity; soaking the multiple of the semi-finished bearings in a container filled with liquid lubricant, such that the multiple of pores among the spherical alloy particles absorb lubricant and store it therein, and finally retrieving the soaking bearings containing rich oil from the container to become self-lubricating bearings.