我厂过去加工双轮双铧犂犂把(如图1)时,冲孔工序分三次完成:第一次冲φ11孔,第二次冲φ14孔,第三次冲出φ12孔两个。这样辅助时间长,效率很低,同时很难控制孔距,不容易保证质量。经过改进之后,用图2的双孔冲模分两次冲出四个孔,提高效率两倍多,质量也可达到要求。在图2中,1是φ14冲头,2是φ12冲头,4是φ11冲头,都是用工具钢制成的。3是定位销,5是衬套,同导正杆7分别紧配在上模板8及下模 I plant in the past processing double wheel doubleshare plow plow (Figure 1), the punching process is completed in three times: the first red hole φ11, the second red hole φ14, the second hole out of φ12 two. This auxiliary a long time, low efficiency, while difficult to control the pitch, it is not easy to ensure quality. After the improvement, with two holes punch Figure 2 out of four holes twice to improve efficiency more than twice as much, the quality can be achieved. In Fig. 2, 1 is a φ14 punch, 2 is a φ12 punch, 4 is a φ11 punch, both of which are made of tool steel. 3 is a positioning pin, 5 is a bushing, with the guide rod 7 are tightly fitted on the template 8 and the lower mold