• Title/Summary/Keyword: Draw/bend test

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Measurement of Springback of AZ31B Mg Alloy Sheet in Draw/bend Test (AZ31B 마그네슘 합금 판재에 대한 드로우벤드 시험과 스프링백 측정)

  • Choi, J.G.;Lee, M.G.;Kim, H.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.302-305
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    • 2007
  • The springback characteristics of AZ31B magnesium alloy sheet was investigated in OSU draw/bend test. Springback is the elastically-driven change of shape of a part after forming and it should be estimated and controlled to manufacture more precise products in sheet forming. The demands are increasing for magnesium alloy sheet press forming, but the study on its springback characteristics is insufficient. Strip draw/bend tests were conducted with various conditions - die radius, sheet thickness and controlled tensile force. The springback angles were measured from 'sidewall curl' of deformed shape. The tendency of springback angle was observed from the tests.

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Measurement of Springback of AZ31B Mg Alloy Sheet in OSU Draw/bend Test (AZ31B 마그네슘 합금 판재의 OSU 드로우벤드 시험과 스프링 백 측정)

  • Choi, J.G.;Choi, S.C.;Lee, M.G.;Kim, H.Y.
    • Transactions of Materials Processing
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    • v.16 no.6
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    • pp.447-451
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    • 2007
  • The springback characteristics of AZ31B magnesium alloy sheet was investigated in OSU draw/bend test Springback is the elastically-driven change of shape of a part after forming and it should be estimated and controlled to manufacture more precise products in sheet forming. Magnesium alloy sheets have unique mechanical properties such as high in-plane anisotropy/asymmetry of yield stress and hardening response. So, there will be a difference in the prediction of springback with symmetric mechanical properties for magnesium alloy sheets. In this work, the Strip draw/bend tests were conducted with various conditions - die radius, sheet thickness and controlled tensile force and the tendency of springback angle was observed from the tests.

A study about shape processing for the bend of the Copper-Tube that use Hair Pin Bending Machine (Hair Pin Bending Machine을 이용한 동 튜브 굽힘 성형가공에 관한 연구)

  • Kang, Heung-Sik;Kim, Dong-Sung;Heo, Sin;Hong, Sung-In
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1705-1708
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    • 2003
  • The purpose of this study is to investigate the manufacturing technique on the U type Draw-Bending of inner grooved tube. This bending process make the U shape tube by Hair Pin Bending machine. The U type tube requires the quality of product that satisfy sufficient conditions for a heat exchanger. The mandrel components act the important roles that prevent wrinkles and keep the shape of cross section of bended tube at bending process. We performed the FEM simulation using LS-DYNA software and the bending test of inner groove tube and then, compared bending simulation with bending test results about mandrel ball diameter, mandrel position and optimal clearance between mandrel and tube.

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