Stepped double-knife positive and negative cutting

The cross shaft parts produced by our factory (Figure 1). The first process is to cut four end faces and then four center holes on a special machine. The process has two congenital fatal defects. One is that the cross-section of the cross-shaft parts is small, and the pitch of the milling cutter teeth is large. Only one tooth is cutting, due to elastic deformation and other factors, the impact and vibration during cutting are large, and the tool damage is serious. Secondly, it can only be milled in one pass. The blank margin is difficult to control. When the milling depth is too large, the vibration is serious, the tool is accelerated, and when the cutting is continued, the cutting force is increased, and the relative positions of the four power heads and the workpiece are increased. Moving, the four central holes of the cross shaft are out of position. Due to such processing conditions, the faults are many, the efficiency is low, the cutting conditions are bad, the product quality is poor, and the task is not completed, which has become a prominent constraint on the production of our factory.

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