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Many of the diesel engine connecting rods processed and produced by our factory have the steps of chamfering the big holes and the two ends of the small head cars. As shown in Figure 1, the two processes were previously processed on the horizontal lathe, although the process is simple. However, the operator is labor intensive. To this end, we designed the double-head chamfering of the connecting rod and the end face of the small-head hole of the car as shown in Figure 2, which is applied to the CA7620 hydraulic multi-knife semi-automatic lathe to realize the clamping of the workpiece → infeed → retracting → loose Semi-automatic cycle processing, easy to operate, easy to adjust. Greatly reduced labor intensity and improved production efficiency.