楔横轧凸轮轴金属流动规律的有限元分析

通过有限元仿真楔横轧凸轮轴时在轧件上取跟踪点,跟踪这些点的位置变化情况来揭示轧件内金属的详细流动规律.因凸轮体小圆端部分在轧制过程中所受模具挤压较小,其金属轴向流动和径向流动较其他变形区小,这种金属流动的不均匀性会影响轧件成形质量;轧制过程中因凸轮体小圆端与模具上凸轮凹槽产生啮合作用,这一作用降低了模具对凸轮体小圆端部分的周向扭转力,因此凸轮体小圆端部分的周向扭转相对较小.轧件凸轮体部分为非圆截面,此部分各向金属流动不均匀,造成凸轮体部分心部金属偏移量比其他部分大.

FEM analysis on the metal flow rule of cross wedge rolling cam shafts

The rule of metal flow during cross wedge rolling was studied through FEM analysis in which some specific points were taken in the work piece and their positions were tracked.The squeezing amount of the small round part on the cam is smaller in the course of rolling,so the amounts of axial and radial metal flows in this area are smaller than those in other deformation zones.Uneven metal flow can influence the forming quality of the work piece.The small round part on the cam meshes with the cam groove on the tool,this kind of meshing function decreases the circumferential torsion applying on the small round part on the cam by the tool,and so the amount of circumferential metal flow in this area is smaller than that in other deformation zones.The centre metal offset of the cam part is bigger than that of other parts of the work piece because the cross-section of the cam is not circular and metal flow in this area is uneven.