With the advancement of processing technology, the surface quality of crankshafts has become very demanding, especially in locations with severe friction and wear, such as the main shaft and connecting rod journals. Barrel finishing technology is widely applicable to the surface processes of large- and medium-sized parts as a typical free-grinding processing method with the characteristics of low processing cost, high processing efficiency, and simple processing equipment. In this study, a horizontal spindle barrel finishing machine is applied to the crankshaft parts. The surface integrity of the crankshaft is systematically evaluated before and after the finishing processing. The experimental results show that the surface integrity of the crankshaft is significantly improved after the finishing processing, which further improves the wear resistance of the part surface and increases the bearing capacity.
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