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A stamping process in which the slab and the core die rotate together, feed by the roller and apply pressure to make the slab close to the core die and deform locally point by point. Spinning can produce various axisymmetric rotating parts, such as speakers, bullet bodies, high-pressure vessel heads, and gongs; It can also be used for cylinder closing, cylinder blank forming, etc. The characteristics of spinning are: a large workpiece can be formed with a small deformation force; The equipment used is relatively simple, and small and medium-sized sheet parts can be spun by ordinary lathe; The mold is simple, only one core mold is needed, and the material requirement is low. Spinning is suitable for small batch production, because it can only process rotating parts, with great limitations and low productivity. Special machinery can be used for spinning, using profiling spinning and digital control spinning. The process of reducing the thickness of the plate while spinning is called thinning spinning, also known as power spinning. It is mainly used to process conical parts, thin-walled tubular parts, etc., and can also be used to spin large diameter deep cylinders, and then cut them into flat plates.Spinning is to fix the flat or hollow blank on the mold of the spinning machine. When the blank rotates with the main shaft of the machine, the blank is pressurized with a roller or driving rod to produce local plastic deformation. Under the joint action of the feed motion of the spinning wheel and the rotation motion of the blank, the local plastic deformation is gradually extended to all the surfaces of the blank, and is close to the mold to complete the spinning process of the part.
The advantage of spinning processing is that the equipment and mold are relatively simple (a lathe can be used to replace them when there is no special spinning machine). In addition to the rotations that can be formed, such as cylindrical, conical, paraboloid or other curves, it can also process the rotating parts with relatively complex shapes. The disadvantages are low productivity and high labor intensity, which are suitable for trial production and small batch production.
