图1所示为印铁盒体的四边折弯工艺展开图。该件材料为0.2～0.3mm 马口铁皮,由于弯曲四边均为锐角,因而成形后零件紧包凸模,不易脱料。并且折弯工艺是一边一边的折,工效很低。为此,我们设计了一副四个边同时折弯自动脱料模(见图 Figure 1 shows the four-sided printing process of bending the box body expansion plans. The material is 0.2 ~ 0.3mm tinplate, because the bending of the four sides are acute angle, so after forming the parts tight package punch, not easy to strip. And bending process is one side of the fold, low efficiency. To this end, we have designed a four-sided simultaneous automatic bending mold (see Figure