|제목(국문)||레이저 용접 테일러드 블랭크의 기본 성형특성 Ⅲ : 신장성형 특성|
|제목(영문)||Forming Characteristics of Laser Welded Tailored Blanks Ⅲ : Stretch Forming Characteristics|
,포항제철 기술연구소 박판연구팀
한수식 (S.S.Han ,포항제철 기술연구소 박판연구팀 ) ▷공저자네트워크등록하기
진조관 (J.K.Jin ,포항제철 기술연구소 박판연구팀 ) ▷공저자네트워크등록하기
권오준 (O.Kwon ,포항제철 기술연구소 박판연구팀 ) ▷공저자네트워크등록하기
|초록||In order to analyze the stretch forming characteristics of tailored blanks, laser welded blanks of different thickness and strength combinations were prepared and stretching tests were done. The stretching formability of laser welded blanks was reduced as increasing the deformation restraining force (strength x thickness) ratio between two welded sheets. Weld line movement was attributed to strain concentration at weaker sheets and resulted in fracture at weaker side, so that fracture could be predicted by the forming limit of the weak sheet. In the case of a welded blank with the similar deformation restraining force ratios between two welded sheets, crack occurred at weld and its forming limit was about 15% less than the base sheet. The effects of lubrication and weld line position on stretching formability were also investigated by experiments. Lower friction did not always give better formability for tailored blanks. Stretching formability was observed to be improved as increasing the area of weak sheet.
|keyword||Tailored Blank, Stretching, Formability, Limit Dome Height|