正挤横轧工艺参数对力与金属流变规律的影响

Effects of Forward Extrusion Cross Rolling Process Parameters on Force and Metal Flow Rules

采用MSC.marc三维大变形热力耦合弹塑性有限元软件和接触分析技术,对半挂车轴空心管坯正挤横轧过程进行了仿真分析,研究了推挤速度、轧辊工作角、轧辊交错布置工艺参数对力能与管坯局部变形的影响规律。结果显示:随着推挤速度的增大,轧辊驱动扭矩与轧制力逐渐增大;随着轧辊工作角的增大,推挤载荷与管坯增厚也随之增大;当轧辊工作角过大时,管坯台肩处金属堆积严重,不利于金属流动;过小不利于生产率的提高与管坯增厚。轧辊交错布置有利于推挤力与驱动扭矩的减小,并对金属流动均匀性与管坯增厚有利。

Forward extrusion cross rolling process of the hollow tube billet for the semi-trailer axle was simulated by using MS（＇.marc large deformation thermo-mechanical coupling elasto-plasticity finite element software and contacting analysis technique. The influence rules of pushing velocity, roller operating angle and alternative arrangement rollers process parameters on the mechanical performance and local deformation of the tube billet were studied. The results show that with the increasing of pushing velocity, the roller driving torque and rolling force increase gradually： with the increasing of roller operating angle, the pushing load and tube billet localized thickening increase; when roller operating angle is too large, stacking of metal on the tube billet circular bead is serious, which is bad for the metal flow; but it is not good tbr improving of productivity and tube billet localized thickening when it is too small. Alternative arrangement of roller is good for the decrease of pushing force and driving torque, and is good for the uniformity of the metal flow and tube billet thickening.