一、概述普通冲孔不能解决孔径小于料厚的深孔,而且冲出孔的光洁度差,尺寸精度低,所以仍需要采用附加工序如扩孔、饺孔。若采用殊殊的模具结构,在强力压料的情况下,以很小的冲孔间隙,能冲出孔径小于料厚的小孔。孔壁光洁度可达▽6,尺寸精度为GB2-4级,孔型垂直度好。表1为普通冲孔的极限尺寸,表2为采用殊殊的模具结构时能达到的技术指标。 First, an overview Ordinary punching can not solve the hole diameter is less than the thickness of the deep hole, and out of the hole poor finish, low dimensional accuracy, so still need to use additional processes such as reaming, dumplings holes. If the special mold structure, in the case of strong pressure, with a small punching gap, can punch out the hole diameter smaller than the material thickness of the hole. Hole wall finish up to ▽ 6, dimensional accuracy of GB2-4 level, hole type verticality is good. Table 1 for the ordinary punching the ultimate size, Table 2 for the use of special mold structure can reach the technical indicators.