In this study, the effect of upper die type on the load characteristics of lower die and the wasted material was studied numerically. The open and closed types of upper die were applied for each stage and the results are analyzed using a finite element analysis method. The half of x,y plane was analyzed due to the symmetrical shape in order to reduce the analysis time. The coefficient of friction was set to Soap_Cold conditions as refer to the analysis library. It was revealed that a lot of underfill portion was observed the open type in stage 4. As a result of the maximum and minimum values of the max principal stress, closed type case much receives compressive stress about 620MPa-2019MPa. In case of open type, The load was reduced in all direction at each stage

Abstract
 1. 서론
 2. 수치해석적 연구 방법
  2.1 각 공정별 금형의 도면
  2.2 공정 해석
 3. 연구 결과 및 고찰
  3.1 결육(Underfill) 특성의 비교
  3.2 최대 주응력 특성의 비교
 4. 결론
 후기
 References

• 민세훈(국립공주대학교 기계자동차공학부 기계설계전공) | Se Hun Min
• 서현규(국립공주대학교 기계자동차공학부) | Hyun Kyu Suh