Precise columnar member and method of producing the same
OwnerJunzo Ozawa, Kazutaka Aoyama +2inventors
InventorsJunzo Ozawa, Kazutaka Aoyama, Takashi Asakura, Katsuaki Yokoi
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Abstract
The present invention relates to a metallic, precise columnar member having an outer diameter with high accuracy, wherein the columnar member comprises a plurality of flattened thread ridges having a predetermined outer diameter provided on the surface of a metallic columnar blank in an axial direction. The method of the present invention comprises the steps of using rolling to form a plurality of thread ridges on the surface thereof and using rolling or drawing to make the tops of the thread ridges flat.
Claims3
A precise columnar member comprising a plurality of thread ridges or ring-shaped thread ridges provided on the circumferential surface of a metallic columnar blank in an axial direction and worked to be flat so that the tops of the thread ridges or ring-shaped thread ridges have a predetermined outer diameter.
A method of manufacturing a precise columnar member, the method comprising the steps of:
- (a) using rolling to form a plurality of thread ridges or ring-shaped thread ridges on the circumferential surface of a metallic columnar blank in an axial direction to obtain a preformed blank;
- and (b) using rolling or diameter-reducing working to make the tops of the thread ridges or ring-shaped thread ridges of the preformed blank flat to obtain a precise columnar member having a predetermined outer diameter.
Dependencies are inferred from the claim text.