Influence of Tool Parameters on Central Deformation in Two-wedge Two-roll Cross-wedge Rolling

Since internal defects in the cross wedge rolling (CWR) process can weaken the integrity of the final product, it is necessary to investigate the influence of tool parameters (forming angle alpha, spreading angle beta and area reduction Psi) on central deformation of workpiece. The change law of average maximum principle stress (sigma(max)) over bar of central point of workpiece has been studied to optimize the tool parameters to avoid the emergence of void. It is found that workpiece with better quality can be formed under the condition of alpha=30 degrees, beta=8 degrees, Psi(1)=48.6%, and Psi(2)=53.3%. Subsequently, a blank for the connecting rod was produced without central defects in factory, which verified the feasibility of study results.