金属成形是用得最多的成形工艺之一。旋压实际上是一种只改变坯料形状而在适当范围内使其面积保持不变的成形方法,因此原材料的厚度在旋压前后是一样的。减薄旋压则是在改变工件(通常为圆柱形)形状的同时还使其面积加大。剪力旋压是将基本上为锥形的工件再次高速旋转和局部施压,不过在起始壁厚、与中心线的交角和成品壁厚间有一已知的预定关系。这三种旋压工艺的特点是材料利用率 Metal forming is one of the most used forming processes. Spinning is actually a forming method that changes the shape of a blank to keep its area within a suitable range, so that the thickness of the original material is the same before and after spinning. Spinning is the thinning of the workpiece (usually cylindrical) shape, while also increasing its area. Shear Spinning is the process of rotating and locally pressing a substantially conical work piece at a high speed again, but with a known predetermined relationship between the initial wall thickness, the angle of intersection with the center line, and the finished wall thickness. The three spinning processes are characterized by material utilization