In this study, the effect of upper die type on the load characteristics of lower die and the wasted material was studied numerically. The different shapes(A-type, B-type, and C-type) of upper die were applied. Also finite element analysis method was applied for the analysis in each stage. The half of X, Y plane was analyzed due to the symmetrical shape in order to reduce the analysis time and be accurate results. The coefficient of friction was set to oil_cold conditions as refer to the system library.
It was revealed that principal stress was the order in A, C, and B. A and B type have the highest value in 4 stage, and C type shows the highest value in 3 stage. In addition, Von mises stress were higher in order A, B, and C. A and B type have the highest in 4 stage, and C type shows to have about the same value in the 2 - 5 stage. The load was generally higher than C type. The load of C type was reduced in YY-direction at each stage without 2, 5, 6 stage.

1. 서 론
 2. 수치 해석적 연구 방법
  2.1 각 타입 및 공정별 금형 도면
  2.2 공정 해석 방법
 3. 연구 결과 및 고찰
  3.1 결육(U nderfill) 특성의 비교
  3.2 주응력(Principal stress) 특성의 비교
  3.3 등가 응력 특성의 비교
  3.4 하중 특성의 비교
 4. 결 론
 후 기
 References

• 민세훈(Department of mechanical Engineering of Kongu National University) | Se- Hun Min
• 서현규(Member, Kongju National University) | Hyun-Kyu Suh Corresponding author