New method for forming shaft having thread and spline by rolling with round dies

The research and implementation work for a new shaft part rolling process have been carried out in the present study, where the shaft has a thread and a small module spline or gear. This method is developed based on two-roll cross rolling technologies for thread and spline, and two round rolling dies provide special structure for synchronously forming thread and spline (or gear). In one rolling process, the threaded and splined (or geared) shapes on the different portions of shaft part are formed synchronously, and then the manufacturing cycle has been shortened and the relative phase between thread and spline (or gear) in mass production can be keep stable. Virtualizing practice of the new forming process for a shaft part with thread and spline was carried out by mean of FEM numerical simulation. The results indicated that the shapes of thread and spline being formed in one rolling process would be achieved by controlling the synchronous rolling process combining reasonable design for die structure.