대형 잉곳의 업셋 단조에서의 기공 압착 거동에 관한 연구

The Study of void Closing Behavior in Upset Forging of Large Ingot

  • 이경진 (부산대학교 대학원 정밀기계과) ;
  • 배원병 (부산대학교 기계공학부) ;
  • 조종래 (한국해양대학교 기계정보공학부) ;
  • 김동권 (두산중공업(주) 기술연구원) ;
  • 김정태 (두산중공업(주) 기술연구원)
  • 발행 : 2005.10.01

초록

In the forging operation of large ingot two break-down process are upsetting and cogging. The first purpose of upsetting is to ensure sufficient forging ratio for subsequent cogging operations and consolidate the voids along the centerline. The second purpose is related to improve the physical properties for a final product. Voids which are generated during the casting process can be one of the decisive defects of materials. So it is necessary to know the standard of Judgment for void-closure in upsetting operation. In practical conditions, FEM analysis(DEFORM 2D 8.1) was carried out to decide how much effective strain has influence on void-closure. It is finally suggested that the function consists of the effective strain of analysis data and the area rate of void.

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