In the application field of industrial ventilation fan design, metal spinning technology is a very critical process. Compared with traditional hydraulic stamping, CNC metal spinning has a shorter development cycle; the cost of metal spinning molds is only 20% of hydraulic molds, saving 30 % material; especially when applied to the air inlet of an industrial fan, Altron only needs to manufacture a simple positioning plate to achieve mold-less spin forming, relying on the CNC program running trajectory of the CNC machine tool and the assistance of a special hydraulic device. Metal spinning process for industrial fan air inlet.