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对免冲预孔翻边模结构做了大胆尝试,摸索出了免冲预孔翻边模凸凹模的尺寸确定方法,为该类模具的设计提供了借鉴。
Make a bold attempt on the structure of the punch-free pre-burring burring mold, and find out the size determination method of the punch-free die for the blow-free burring burring mold, which provides a reference for the design of such mold.