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Abstract：
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Upset extruding is a process often used in forging manufactureBut there are some difficulties in designing the mould parameters because of the complicated deformation in upset extruding processOne of the important parameters influencing the forming process is drafting anglesThere is no precise formulae, curves or tables, up to now, to direct the designingIn this paper, a rigid visco plastic model is constructed to describe the process of upset extruding, and then,analysis of the influence on the forming process results and defects produced in the process by employing different drafting angle are presentedAt the first time, curves based on numerical analysis and simulation technique are given to describe the relation between drafting angles and results of upset extrudingThese curves could be used not only as the theoretical support in optimizing the drafting angle of the upset extruding process, but also as a reference for other extruding processes
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AuthorIntro：
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Reference：
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[1] 周杰,苏长清,金伟东,等高速钢扁锭锻造内部裂纹产生原因研究[J].机械工程学报,1996,(5):3035,40.
[2] 周杰,尹红灵,伍驭美,等摩擦对收口的影响研究[J].锻压技术,2001,(1):3941,7.
[3] 周永强,周杰,王梦寒.万向节叉热成形过程模拟研究[J].锻压技术,2002,(3):67,30.
[4] KobayashiS,OhS I,AltanT.Metal forming and finite elementmethod[M].NewYork:OxfordUniversityPress,1988.
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