The objective of this work is to investigate the A-IMS structural defects on the tubular shaft and solid shaft by analyzing the under-fill, metal flow, effective stress and load characteristics. The tubular shaft and solid shaft were designed 6 stage process by upper and lower die. The results were analysed by using a finite elements analysis method. The coefficient of frictions were set Oil_Cold conditions as referred to the analysis library. It was found that the actual under-fill phenomenon was not observed in both tubular and solid shaft. The load values of tubular and solid shaft were 520ton and 255ton, respectively. These values were under the limit of forging machine maximum value.

Abstract
 1. 서 론
 2. 수치 해석적 연구 방법
  2.1 각 제품 금형의 형상
  2.2 공정해석
 3. 연구 결과 및 고찰
  3.1 결육 특성
  3.2 금속 유동선 특성
  3.3 유효 응력 특성
  3.4 하중 특성
 4. 결 론
 References

• 서현규(Division of Mechanical & Automotive Engineering, Kongju National University) | Hyun-Kyu Suh Corresponding Author
• 민세훈(Graduate school of Mechanical Engineering, Kongju National University) | Se-Hun Min