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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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