2.Analysis of Metal Spinning Principle
With regard to conventional spinning, the thickness of the blank does not change much during the spinning process. and, the blank contracted or elongated in the circumferential direction and the radial direction to complete the forming of the workpiece, formed by changing the diameter of the sheet.
So, it is suite to process thin-walled rotary bodies with non-cutting deformation. And, the process also causes a slight thickness change. Partial thinning and instability are likely to occur during the spin forming process, so that is better to increase the spinning steps to avoid defects.
Power spinning can also name thinning spinning. After spinning, not only the thickness of the blank changed, but also its size, shape, and performance changed. therefore, the thickness of the part after power spinning will be less than the thickness before spinning.
Power spinning can divide into two types, shear spinning, extrusion spinning. Similarity, shear spinning often spun blank plates, such as cones, hemispheres, and parabolas. extrusion spinning often spun the cylindrical workpiece. When spun the composite part, can simultaneously adopt two spinning processes.