Patent ID: 6890594

Claim:
A method of processing and finishing an inner surface of a bearing having a cylindrical shape, without cutting, which bearing comprises a backing metal, an impregnated and coated layer formed by impregnating and coating a porous sintered layer of a Cu-alloy powder provided on the backing metal with a polytetrafluoroethylene composition, and a resin layer composition formed on the impregnated and coated layer and consisting essentially of the polytetrafluoroethylene, the resin layer being positioned on the innermost side of the bearing, the method comprising: holding the bearing in a jig to contain outward deformation of said bearing; heating a tapered mandrel having a peripheral surface to a predetermined temperature so as to expand the mandrel by thermal expansion thereof, said peripheral surface having a roughness of Ry 1.0 μm or less; and inserting the heated mandrel into a bore of the bearing so as to press the peripheral surface of the mandrel against the resin layer of the bearing, whereby the inner surface of the bearing is finished without cutting the resin layer.