This paper describes the structure and forming method of the pipe blank, structure of die, process flow, once-forming method of big end and small end of the reducer and integral once-forming method.

• 文章介绍了该新工艺管坯的结构型式及成型方法、模具的结构、工艺流程、大端和小端分别一次成型方法、一次整体成型方法。