为提高厚钢板冲孔的孔壁光洁度,可以采用新的“挤压冲孔法”,它属于正挤压。冲孔可以在单动压力机上的一次行程巾进行。它不需要特殊的模具运动,只要将普通的模具结构进行一定的修改。冲孔凹模可保持不变,而冲孔凸模的端面直径要明显小于冲孔直径,采用较大的冲裁间 In order to improve the hole wall finish of the thick steel plate punching, a new “extrusion punching method” can be adopted, which belongs to the positive extrusion. Punching can be performed on a single stroke towel on a single action press. It does not require special mold movement, as long as the ordinary mold structure to make some changes. Punching die can remain unchanged, and punching punch the end face diameter is significantly smaller than the punching diameter, using a large blanking room