In the spinning process, not only change the shape of the blank, but also significantly change (thinning) its wall thickness is called strong spinning (also known as thinning spinning). The short and thick cylindrical blank set on the mandrel in the process of rotation, through the movement of the spinning wheel to apply a large external force and act on a small area, so that it produces plastic deformation. Since the metal being spun has a greater resistance to flow in the circumferential direction, it flows in the axial direction where the resistance is minimized and accumulates to form a long, thin-walled cylindrical part, which is therefore referred to as cylindrical part thinning spinning.