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vacuum explosive expanding
expl.
抽真空爆炸胀形
在胀形过程中,由于毛料与模腔之间的空气无法排岀,所产生的热量会造成零件和模具表面的烧伤。同时,当空气被压缩到很小的体积时,其强大的压力相当于一个坚硬的物体夹在模腔中易使工件和模具被压伤,产生鼓包和沟槽。为避免此类现象的发生,在实施爆炸胀形工艺时,必须把毛料与模腔之间的空气抽掉
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