引言用圆管毛坯冷成形零件,这是近二十年人们越来越感兴趣的一种工艺。多年来,用这种成形法生产民用供水系统的铜质三通件已成为普通工艺,而最近主叉直径达12英寸的钢质三通件也采用了这种方法成形。三通件的成形同管子的轴对称胀形相比是比较简单的。这两种成形方法都是使金属由拉伸变形过程改变成挤出变形过程,从而让新材 Introduction Cold forming parts with round pipe blanks is a process that people are increasingly interested in for nearly two decades. Over the years, the production of copper tees for civil water systems has become commonplace with this method of forming, and the recent production of steel tee with 12-inch diameter primary spikes has also been done in this way. The shaping of tee parts is simpler than the symmetrical bulging of tubes. Both of these forming methods change the metal from the tensile deformation process to the extrusion and deformation process so that the new material