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US 7,251,891 B2Granted
Production method for sintered bearing member, fluid dynamic pressure bearing device, and spindle motor
AssigneesHitachi Powdered Metals Co., Ltd., Minebea Co., Ltd.
InventorsKatsutoshi Nii, Shunichi Togashi, Tadashi Akahori
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Abstract
A production method for sintered bearing member comprises: compacting a metal powder into a green compact, sintering the green compact into a sintered compact; impregnating a resin solvent into the sintered compact, and removing the resin solvent adhering to a surface of the sintered compact, thereby exposing a matrix as sintered on a surface of the sintered compact. Pores existing in portions other than the surface are sealed with the resin.
Claims6
A production method for a sintered bearing member, the method comprising:
- compacting a metal powder into a green compact;
- sintering the green compact into a sintered compact;
- impregnating a water soluble resin solvent into the sintered compact;
- and
- removing the resin solvent adhering to a surface of the sintered compact, thereby exposing a matrix as sintered on a surface of the sintered compact;
- wherein pores existing in portions other than the surface of the sintered compact are sealed with the resin.
3 more elements
Dependencies are inferred from the claim text.