프레스-금형 일체 구조해석에 의한 차체용 블랭크 홀더의 번형 최적화

During forming of large automotive body panel, die components deflect due to the forming loads transmitted through the contact between various press and die components. Because die deflection results in forming defects and non-uniform material flow, time consuming corrective action to maintain uniform gap between dies, so called die spotting, should be done before the completion of dies. In this study, to predict the die deflection accurately, a structural analysis procedure considering the deformation of press-die assembly and the thickness variation of blank simultaneously is presented. The analysis procedure is applied to the optimization of the position and height of balance block for simplified automotive model die. The optimization results show much improved contact state between the blank and dies.