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活塞体(图1b)中我厂生产的豪华大客车中的一个主要冲压零件,材料08Al钢板,厚3mm,工艺要求以第二次拉伸所得到的半成品件(图1a)为毛坯件。这个零件成形难度较大,其工艺顺序为:落料;第一次拉伸;第二次拉伸;车边;缩口胀形;二次车边;钻孔。本文着重介绍缩口胀形工序。
In the piston body (Figure 1b), a main stamping part in the luxury bus manufactured by our factory is made of 08Al steel plate with a thickness of 3mm. The semi-finished products (Figure 1a) obtained by the second drawing are required for the blank. This part is more difficult to form, the process sequence is: blanking; first stretch; the second stretch; car side; necking contraction; second car edge; drilling. This article focuses on the shrink-neck process.