Patent ID: 7866046
Filing Date: 2011-01-11
Classification: B22F,F16C,Y10T

Abstract:
1. A method of manufacturing one of shaft and bearing comprising: forming a substrate having a surface with a plurality of protrusions thereon, the protrusions being adapted for forming grooves in the one of the shaft and bearing for generating hydrodynamic pressure; pushing a feedstock of binder and powder to the surface to form a perform on the surface of the substrate; removing the substrate from the perform; sintering the preform; precision machining the preform to obtain the one of the shaft and bearing; the step of pushing a feedstock includes metal injection molding (MIM), the metal injection molding comprises placing the substrate into a mold and then injecting the feedstock of binder and powder into the mold to form the preform; wherein the substrate includes a kind of plastic with a melting point higher than that of the binder of the feedstock; and wherein the step of removing the substrate comprises: applying solvent debinding to the preform formed in the step of pushing a feedstock to remove the binder in the preform partly out, and then applying thermal cracking debinding to the preform to remove the binder in the preform completely, thereby removing the substrate from the perform.