Integrated hollow motor shaft closed spinning forming process and device and spinning roller

The invention discloses a closed spinning forming process and device for an integrated hollow motor shaft and a spinning roller, and the closed spinning forming process for the closed end of the integrated hollow motor shaft comprises the following steps: 1, blanking a pipe blank; 2, spinning the open end; 3, spinning the closed end; and fourthly, machining finish machining is conducted. One end of the motor shaft is closed through the spinning technology, the motor shaft is close to the outline of a finished product to the maximum extent, the allowance of subsequent machining is reduced, the production efficiency of the product is improved, the material utilization rate is increased while light weight is achieved, and the production cost of the product is reduced. Compared with a traditional welding process, closed spinning forming is efficient, stable and high in flexibility, and an integrated structure of the motor shaft is achieved. And through spinning plastic forming, the motor shaft has an uninterrupte