制动蹄铆钉孔不仅多而且均布在圆周上,这种圆弧形多孔的加工,一直是我厂的“老大难”。文化大革命中,老工人登上了设计舞台,在革命技术人员的配合下,只化了几个月的时间,就设计成功了一台圆弧形多孔钻,生产效率提高了5～6倍,劳动强度也大大降低。现将这台圆弧形多孔钻简介如下,其结构如图1所示. Brake shoe rivet hole is not only more and more uniform in the circumference, this circular arc porous processing, has always been our factory’s “grandstanding.” Cultural Revolution, the old workers boarded the design stage, with the cooperation of the revolutionary technicians, only a few months time, the successful design of a circular arc-shaped porous drill, production efficiency increased by 5 to 6 times, Labor intensity is also greatly reduced. Now this arc-shaped porous drill profile is as follows, the structure shown in Figure 1.