钢门窗生产中,在普通低碳热轧窗框钢4 mm厚的腹板上冲制φ4。2～7mm的四种通孔,一个年产12万m~2钢窗车间日冲孔数在2万个以上,圆凸模的刃磨、更换很频繁。我厂原采用图1所示凸模,由于凸模表面有台阶,外形细长,加工工艺复杂,生产成本高,加上非专业厂生产,热处理质 In the production of steel doors and windows, four kinds of through holes of φ4.2 ~ 7mm are punched on the 4 mm-thick webs of common low-carbon hot-rolled window frame steel, and the number of punching holes per day of a workshop with an annual output of 120,000 m 2 20,000 or more circular punch grinding, replacement is very frequent. I used to plant the original punch shown in Figure 1, due to the convex surface of the step, slender shape, complex processing technology, high production costs, coupled with non-professional factory production, heat treatment of quality