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对凸轮轴的粗加工,一般是用靠模成形法在车床上进行的。为了使一次对刀加工出的各凸轮和偏心轮达到理想的工艺尺寸,除保证各凸轮靠模基圆尺寸一致外,还要求偏心轮靠模的尺寸与凸轮靠模的尺寸保持一定的关系。凸轮靠模的基圆直径是根据靠模与工件的比例确定的,而偏心轮靠模的直径则应根据工件和凸轮靠模基圆尺寸来确定。
Rough machining of camshafts is generally done on a lathe using a form-forming method. In order to achieve the ideal process size for each cam and eccentric wheel machined once, it is required that the dimensions of the eccentric cam and the size of the cam abutment maintain a certain relationship, besides ensuring that the size of the base circle of each cam is consistent. The diameter of the base circle of the cam base is determined according to the ratio between the master and the workpiece. The diameter of the base cam should be determined according to the base circle size of the workpiece and the cam base.