The main shaft drives the blank and the mold core to rotate, and then the rotating wheel is used to apply pressure to the rotating blank. Due to the rotary motion of the spindle of the spinning machine and the longitudinal and lateral feed motion of the tool, this local plastic deformation gradually spreads to the entire blank, thereby obtaining hollow rotating parts of various shapes. Metal spinning is mostly used for forming open-shaped workpieces, that is, the diameter of the forming end is larger than the diameter of other parts, so that the spinning forming part can be removed from the core. If you need a closed-shaped workpiece, you need to spin the workpiece into pieces, and then weld the various parts together to form the desired shape. Ideal spinning forming materials include aluminum, copper, brass, bronze, silver and mild steel. The workpiece must be annealed before spinning. If the workpiece is to be deformed significantly during processing, it may be necessary to perform two to three annealing treatments before the end of spinning. Metal spinning is usually performed under computer numerical control, which is also called numerical control spinning.