Drawing is mainly used to process box shaped parts and other thin-walled parts with complex shapes. Under the pressure of the press, the processing method of making open hollow parts from flat slab blank or hollow process part by drawing die is divided into thinning drawing and constant thinning drawing. Drawing generally requires a complete process supplementary surface and pressing surface, and it is a closed geometric shape, but forming can only be made locally without being completely closed. Forming generally does not change the wall thickness of the part, or rarely. In terms of cost calculation, if the parts need to be drawn, it is necessary to consider leaving more overlapping materials, because drawing ribs are required to ensure that the surrounding materials do not flow inward. The specific process needs to add one step of edge cutting after the completion of drawing.

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