我厂生产的信号灯,在外形上进行了改进,将原来的胶木灯罩改成金属灯罩。灯罩的成形,需要落料、拉伸、切边、冲预孔、翻边、压穴等六道工序。若每道工序用一付模具,即需六付模具。这样,不但模具数量多,成本贵,而且生产时,势必占用较多的冲床和操作人员,极不经济。为了减少模具数量,在保证产品质量的前提下,将前四道 I plant the production of lights, in the shape of the improvement, the original bakelite shade into a metal shade. Lampshade forming, the need blanking, stretching, trimming, punching pre-hole, flanging, pressure points and other six procedures. If every process with a pair of molds, molds need to pay six. In this way, not only the number of molds, expensive, and production, it is bound to take more punch and operator, very uneconomical. In order to reduce the number of molds, the premise of ensuring product quality, the first four