형상정밀도 예측을 위한 780MPa급 차체부품의 스프링백 해석

Finite element stamping analysis is carried out for the side sill inner member of an auto-body with a 780 MPa-grade high strength steel sheet in order to predict the spring-back phenomena accurately. The springback mechanism is investigated in the cross section of the stamped product quantitatively and the amount of the compensation angle is predicted to correct the unexpected shape inaccuracy. Parameters for the accuracy measurement such as gap and flush are calculated in the simulation and it is confirmed that the simulation result shows good agreement with the experimental one within ±1 mm tolerance.