Controlling method for redundancy of inner cavities and oil ways of casing

The invention relates to the technical field of aerospace, and discloses a control method for redundancy of inner cavities and oil ways of a casing. A base, a workpiece, a grinding block, a bottom plate, a fixing structure, a spinning structure, a rotating structure and a cleaning structure are included, a hydraulic cylinder is arranged on the base, and a cavity structure is arranged on the workpiece. The control method for the redundancy of the inner cavities and the oil ways of the casing is reasonable in design and simple in structure. A using method is simple and convenient to operate. All-directional polishing and grinding can be conducted on the interiors of the inner cavities or the interiors of the oil ways through cooperation of the spinning structure and the rotating structure, the angle of the workpiece does not need to be manually adjusted, and therefore automatic treatment is achieved. Through cooperation of the grinding block and an auxiliary polishing and grinding structure, polishing and grind