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국내 최대 기계·건설 공학연구정보
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    국내학술지 제목 게시판 내용
    제목(국문) 유동응력, 마찰, 온도, 속도 등이 단조 중 단류선의 유한요소 예측에 미치는 영향
    제목(영문) Effect of Flow Stress, Friction, Temperature, and Velocity on Finite Element Predictions of Metal Flow Lines in Forgings
    저자 최무호 (M. H. Choi ,All Bearing Belover’s Academy ) ▷공저자네트워크등록하기
    진호태 (H. T. Jin ,경상대학교 기계공학부 ) ▷공저자네트워크등록하기
    전만수 (M. S. Joun ,교신저자 : 경상대학교 기계공학부/공학연구원 ) ▷공저자네트워크등록하기
    초록
    In this paper, the effect of flow stress, friction, temperature, and velocity on finite element predictions of metal flow lines after cylindrical upsetting is presented. An actual three-stage hot forging process involving an upsetting step is utilized and experimental metal flow lines are measured to study the effect of the various process variables. It was found that temperature and velocity for reasonable values of friction have little influence on metal flow lines especially those located deep within the cylinder but that flow stress has a direct influence on the flow lines. It was shown that a pure power law material model cannot reflect the real flow stress of hot material because it underestimates the flow stress especially around the dead-metal zone for the upsetting of a cylindrical specimen. It is thus recommended that a proper lower limit of flow stress be assumed to alleviate this issue.
    초록(영문)

    In this paper, the effect of flow stress, friction, temperature, and velocity on finite element predictions of metal flow lines after cylindrical upsetting is presented. An actual three-stage hot forging process involving an upsetting step is utilized and experimental metal flow lines are measured to study the effect of the various process variables. It was found that temperature and velocity for reasonable values of friction have little influence on metal flow lines especially those located deep within the cylinder but that flow stress has a direct influence on the flow lines. It was shown that a pure power law material model cannot reflect the real flow stress of hot material because it underestimates the flow stress especially around the dead-metal zone for the upsetting of a cylindrical specimen. It is thus recommended that a proper lower limit of flow stress be assumed to alleviate this issue.

    keyword Metal Flow Lines, Forging Simulation, Flow Stress, Upsetting Process, Lower Limit of Flow Stress
    저널명 소성·가공 ▷관련저널보기
    VOL 24
    PAGE 0227
    발표년도 2015
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