Patent ID: 6675626
Filing Date: 2004-01-13
Classification: B21D,Y10S

Abstract:
A press forming process using a stretching press to form a product with a curved portion in a lateral wall of a workpiece having approximately the same shape as that of said product, comprising:providing a pad portion in said lateral wall of said shaped workpiece prior to starting the press forming process using said stretching press, and completing formation of said shaped workpiece by using said stretching press to stretch said lateral wall at said curved portion to deflect the lateral wall in a direction (X) that is perpendicular to the longitudinal direction of the lateral wall and thereby spread said pad portion at said curved portion mainly in a longitudinal direction of said shaped workpiece while maintaining a continuous shape to said lateral wall whereby said curved portion of said lateral wall is prepared so as to have a spring back in the direction (X) that is perpendicular to the longitudinal direction of the lateral wall of said product minimized.