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工件冲裁时,凸模不但受到冲裁力P的作用,同时还受到凸模与坯料接触面相互作用所产生的侧压力F的作用。若冲裁封闭形孔,侧压力F能得到平衡,可以不加考虑。但冲裁非封闭孔时,侧压力F不易平衡,对工件质量及模具寿命均有影响。当侧压力F大至一定值时,容易使加工件断面成倾斜状态,往往会因此而造成产品报废。此外侧压力还容易使模具加工时走动,引起凸模产生附加弯曲变形,致
When the workpiece is punched, the punch is not only subjected to the punching force P, but also subjected to the lateral pressure F generated by the interaction between the punch and the blank contact surface. If the blanking closed hole, the side pressure F can be balanced, can not be taken into account. However, blanking non-closed hole, the side pressure F is not easy to balance, the quality of the workpiece and mold life are affected. When the side pressure F to a certain value, easy to make the workpiece profile into a tilted state, often resulting in product scrapped. The outside pressure is also easy to move the mold processing, causing additional punch bending deformation caused by