There are essential differences between fine blanking and ordinary blanking. Common blanking is to control the tearing of sheet metal in the blanking process. Fine blanking, on the other hand, tries its best to restrain the tearing of sheet metal during blanking. Before the fine blanking parts are separated from the sheet metal, they are always kept as a whole. During the fine blanking process, the sheet metal is always in the plastic deformation process. In order to achieve this goal, V-shaped blank holder and reverse pressing plate shall be pressed before blanking to prevent internal and external metal sheets from moving during blanking. In addition, in combination with the small gap between the male and female dies and the appropriate small fillet of the female die, the three-dimensional compressive stress state of the local blanking area is formed during the blanking process, so as to ensure the plastic deformation process of blanking.
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