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PURPOSE:To effectively increase the thickness of a cylindrical part in low load and in few manhours by reducing the diameter of a temporary cylindrical part having an outside diameter larger than the final outside diameter of a cylindrical part. CONSTITUTION:The temporary cylindrical part 51 having...

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Bibliographische Detailangaben
Hauptverfasser: ASHIHARA KAZUO, KOBAYASHI KAZUTO
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE:To effectively increase the thickness of a cylindrical part in low load and in few manhours by reducing the diameter of a temporary cylindrical part having an outside diameter larger than the final outside diameter of a cylindrical part. CONSTITUTION:The temporary cylindrical part 51 having an outside diameter D1 larger than the final outside diameter D of the cylindrical part 91 is formed on a plate stock, then, when this temporary cylindrical part 51 is reduced in diameter and formed, compressive stress acts on the temporary cylindrical part 51 and the thickness is increased because the inside of the temporary cylindrical part 51 is hollow. In this way, the thickness of the cylindrical part 91 can be increased effectively in low load and in few manhours without buckling the temporary cylinder part 51.