METHOD FOR PREVENTING STRESS CORROSION CRACKING OF METAL

Japanese Patent JP2005095960

A

To provide a simple method for preventing stress corrosion cracking in a worked metal product.

In a step of manufacturing a worked product by using the pressing, a blank 1 is formed by blanking a metal, and a stock 2 after the bumping is formed by performing bumping on both sides of the blank 1. The stock 2 after the bumping is drawn in a semi-cylindrical shape to form a drawn product 3, and a final cylindrical drawn product 4 is manufactured through a product working step. Stress corrosion cracking in the cylindrical drawn product 4 is prevented by exerting compressive stresses in the surface of the blank 1 by the pressing by bumping, and mitigating the residual tensile stress generated in the next drawing.

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HAMADA HIDEAKI

JP2003335286A

April 14, 2005

September 26, 2003

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MATSUSHITA ELECTRIC IND CO LTD

B21D22/02; B21D22/20; C21D7/04; (IPC1-7): B21D22/02; B21D22/20; C21D7/04

Shohei Oguri
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Yuriko Hamada

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