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金属体积成形预成形设计，是材料多工序成形工艺与模具设计的中心工作。
Preform design in bulk metal forming is the central task of bulk metal forming process and die design.
汽车轮辐零件的制作是一个多工步冲压成形过程，在最后一道工序圆孔翻边时经常出现开裂。
Manufacturing the automobile spoke components is a multi-step stamping forming process, the round-hole flanging often cracks in the last process.
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