Multi-stage Inverse Finite Element Analysis of Rectangular Cup Drawing considering Sliding Constraint Surfaces with Arbitrary Intermediate Die Shapes

임의 곡면의 금형형상이 고려된 미끄럼 구속면을 이용한 직사각컵의 다단계 유한요소 역해석

An inverse finite element approach is employed for more capability to design the optimum blank shape from the desired final shape with small amount of computation time and effort. For multi-stage deep-drawing processes, numerical analysis is extremely difficult to carry out due to its complexities and convergence problem as well as tremendous computation time. In this paper, multi-stage finite element inverse analysis is applied to multi-stage rectangular cup drawing processes to calculate intermediate blank shapes and strain distributions in each stages. Finite element patches are used to describe arbitrary intermediate sliding constraint surfaces.