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摘要：
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曲面零件拉深时悬空区易发生内皱,增加压边力可防止内皱的产生,而临界压边力的大小则受到各工艺参数的影响。根据平面压边拉深的变形特点,进行了内皱临界计算,获得锥形件和球形件曲面零件不起内皱的临界条件。以锥形件为例,通过试验方法研究了材料性质、相对厚度、拉深系数及凸凹模半径比等主要参数对内皱发生时刻的影响。研究结果表明,当材料硬化指数、凸凹模半径比和相对厚度减小时,内皱发生时刻提前,而当减小拉深系数时,可延缓起皱的发生。因此,合理的选择工艺参数将有效地防止曲面零件拉深时内皱的发生。
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The inner-wrinkle is easy to be produced at the suspending zone during drawing the curved surface parts.Increasing the holder force can avoid the inner-wrinkle,and the critical holder force is decided by some processing parameters.According to the deformation of drawing under blank holder,critical calculation for innere-wrinkle was carried out,and the checking condition for drawing cone and sphericity parts were gained.Then,the effect of main parameters on inner-wrinkle was studied by experiment for drawing cone parts,such as material characteristics,relative thickness,drawing coefficient and so on.The results show that decreasing material hardenability value,radius ratio of punch-die and the relative thickness,the trend of inner-wrinkle is increased;but reducing drawing coefficient,the inner-wrinkle is postponed.Therefore,reasonably selecting the processing parameters shall avoid the inner-wrinkle during drawing curved surface parts.
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基金项目：
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长安大学青年科学基金(06Z11)
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作者简介：
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参考文献：
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[1]徐尚德,雷君相,于珊珊.板料拉深过程中的压边力控制技术[J].锻压装备与制造技术,2004,(2),51-55.
[2]赵军,马瑞,官英平,等.锥形件拉深智能化控制中压边力的控制规律[J].材料科学与工艺,2004,12(4):439-441,445.
[3]王作成,韩福涛,崔国涛.圆锥形件变压边力拉深工艺的研究[J].塑性工程学报,2006,13(2):25-28.
[4]陶友瑞,张福全,黄长青.半球形件冲压成形的防内皱压边力研究[J].塑性工程学报,2004,11(1):29-31.
[5]孙成智,罗思东,王东川,等.拉深过程中压边力分布实验测量方法与数值模拟[J].锻压技术,2005,30(6):18-21.
[6]刘建华,丁国,王志恒.内皱发生的临界计算及校核条件[J].锻压技术,2000,25(2):8-31.
[7]梁炳文,胡世光.板料成形塑性理论[M].北京:机械工业出版社,1987.
[8]王孝培.冲压手册[M].北京:机械工业出版社,1988.
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