이중복합봉 정수압 압출시 접합면 거동에 관한 연구

A Bonding Surface Behavior of Bi-metal Bar through Hydrostatic Extrusion

  • 박훈재 (한국생산기술연구원 생산기반기술센터) ;
  • 나경환 (한국생산기술연구원 생산기반기술센터) ;
  • 조남선 (한국생산기술연구원 생산기반기술센터) ;
  • 이용신 (국민대학교 기계공학과)
  • 발행 : 1997.03.01

초록

The present study is concerned with the hydrostatic extrusion process of copper-clad aluminium bar to investigate the basic flow characteristics. Considering the bonding mechanism of bi-metal contact surface as cold pressure welding, the normal pressure and the contact surface expansion are selected as process parameters governing the bonding condition. The critical pressure required for the bonding at the interface is obtained by solving a "local extrusion" using a slip line meyhod. A viscoplastic finite element method is used to analyze the steady state extrusion process. The boundary profile of bi-metal rod is predicted by tracking a particle path adjacent to interface surface. The variations of contact surface area and the normal pressure along the interface profile are predicted and compared to those by experiments.

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