Reduction of Springback in Hat Channel with High-Strength Steel Sheetby Stroke Returning Deep Drawing

• DOI: 10.4028/www.scientific.net/kem.554-557.1320
• Publication Date: 2013-06-13T14:14:03Z
• Authors: Taro Geka; Masayuki Asakura; Takuma Kiso; Takashi Sugiyama; Masato Takamura; Motoo Asakawa
• Keywords: Curl (programming language); Blank; Deep drawing; Stroke

This study investigated the twisting phenomenon in curved hat channel products made of dual-phase 980-MPa-class high-tensile-strength steel sheets. The stroke returning deep drawing (SRDD) method was proposed to deal with twisting. In this new method, after punch reaches bottom dead point, it returns a certain height without blank holder being removed. With application SRDD hardly occurred, but sidewall curl increased. A two-step then reduce products. process is carried out two steps under different conditions. results showed that reduced and twist simultaneously.