Influence of tool parameters on internal voids in cross wedge rolling of aluminum alloy parts

• 出 处: 2012 Postdoctoral Symposium of China on Materials Science &a
• 发表日期: 2012年期

　　The internal void of cross wedge rolling (CWR) part can be treated as porous material due to their similar physical property and deformation characteristics.Aiming at the CWR process of aluminum alloy 7075 workpiece, the numerical simulation model for internal void was established by means of the rigid-plastic FEM method for porous material.The relative density is used to research the influence of three primary parameters on internal void in CWR process, include the forming angle a, the stretching angle β and the area reduction AA.From the experimental results, the expansion of internal void is occurs in stretching zone, and the knifing zone just has a little influence on it.The stretching angle has a large influence on internal void, when the area reduction has a small influence on it.The size of internal voids decrease with the increase of area reduction, stretching angle and forming angle.when design the CWR tool geometry and operating conditions, to prevent the internal void, the area reduction is suggested to be between 55% and 65%, the stretching angle is 8~ 10, the forming angle is 29~ 32.