레이저 용접을 위한 박판재의 정밀 전단 메카니즘 개발 (유한요소법을 이용한 정밀 전단 공정해석)

Development of Precise Shearing Mechanism on Thin Sheet for Laser Welding (Analysis of Precise Shearing Process using FEM

Recently, Tailor Welded Blank (TWB) is widely used in automotive industry since the transformation characteristic of its material can be changed. However, clearance between welding surfaces becomes the important factor which affect the quality of the laser weld, causing difficulties in preparing the sheet. The objective of this paper is to systematically evaluate the effects of previously presented fracture criterion and shearing condition on precise mechanical shearing simulation result. For this purpose, a parametric study was peformed to investigate the effect of finite element size and fracture criterion on simulation result. Also, in order to predict the optimum shearing condition, effect of shearing conditions such as clearance and punch radius on the shear plane shape was evaluated.