Effects of process parameters on surface quality of shaft parts formed by warm cross-wedge rolling

The difference between the warm cross-wedge rolling process and the traditional cross-wedge rolling is that the rolling temperature is controlled below the recrystallization temperature of the workpiece, which has the advantages of reducing energy costs, decarburizing, and improving the surface quality of the workpiece. In this paper, through the combination of simulation and experiment, the effect of process parameters on the surface quality of shafts formed by warm cross-wedge rolling was systematically explored. The results displayed that, for the shafts with large cross-section reduction, increasing the rolling temperature and selecting a small forming and a large stretching angle can improve the surface quality. The selection principles of the stretching angle and the forming angle in the warm cross-wedge rolling process were determined. With comparison, the average error between the experiment and simulation was 1.12%, which verified the reliability of the warm cross-wedge rolling process. The research results provide a theoretical reference for the selection of the process parameters of the warm cross-wedge rolling forming shafts.