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图1所示下板为某军工产品上的零件,采用t=2mm厚的616装甲钢板制成。由于结构及功能上的需要,在其中部及四周要成形出多处翻边孔,要求成形后
The lower panel shown in Figure 1 is a part of a military product made of 616 armored steel with a thickness of t = 2mm. Due to the structural and functional needs, in the middle and around to form a number of flanging holes, after forming