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拉深冲压件壳体的特点
08-21 / 2021
    壳体拉深冲压件是将板料拉深成圆柱瓶型零件;在拉深操作中,坯料直径受壳体周长的影响,而周长又受到冲压件材料的流动性和外围材料向内流动阻力和边缘阻力;当边缘材料受到的阻力超过极限之后边缘就会起皱失稳。为了避免出现起皱,必须是冲压件材料可以在凸模和压边圈之间顺利流动。造成拉深破裂的两个主要原因是拉深冲压件直径与坯料直径比值超过极限值和拉深半径从平整的坯料拉深成壳体和将壳体拉深为直径更小的壳体时,材料向内流动距离都有一个极限值,通常称之为拉深系数,极限拉深系数受到冲压件材料流动性、材料抗压能力和由受压而引起的流动阻力等因素的影响。过大的流动阻力使壳体边缘破坏起皱,该区域是材料抵抗力最弱的区域;
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