Cylindrical deep drawing of austenitic stainless steel sheet

摘要

PPROBLEM TO BE SOLVED: To raise productivity, when applying cylindrical deep-drawing to an austenitic stainless steel plate, by decreasing a forming speed just before a punch is brought into contact with the austenitic stainless steel plate to be drawn and increasing the forming speed at the stage where the forming exceeds a crack generation portion. PSOLUTION: When applying cylindrical deep-drawing to the austenitic stainless steel plate 1 to be drawn, which is fixed with a die 3 and a blank holder 4, by pressing a punch 2 into the plate 1, a preliminary deep-drawing, in which drawing is preliminarily conducted to a deep-drawing height where a crack is generated, is carried out. The height from the position, where a crack is generated on the preliminarily drawn product, to the top part of the deep-drawing is measured. When actually conducting the deep-drawing, the forming speed is decreased just before the punch 2 is brought into contact with the austenitic stainless steel plate 1 to be drawn, and increased after the deep-drawing is carried out at least by the height from the position, where a crack is generated on the preliminarily drawn product, to the top part of the deep-drawing. PCOPYRIGHT: (C)2010,JPO&INPIT