基于均匀性的模具表面复合织构

Composite texture of mold surface based on uniformity

通过ABAQUS软件对筒形件拉深过程进行了数值模拟,揭示了筒形件模具表面摩擦特性对成形件的厚度、应变及其回弹具有重要影响,且模具表面存在最优的摩擦特性分布;以板厚的均匀度为优化目标,得出模具表面最优的摩擦系数组合为μA=μC=μF=0.12,μB=0.26,μD=0.09,μE=0.03,此时板厚的变化幅度最小,仅为27.99%.基于此,采用激光毛化和激光微织构复合造型技术,对筒形件模具表面的摩擦特性进行设计制造,并进行拉深成形对比试验.试验结果表明:复合造型后,拉深得到的成形件筒底圆角部分最大减薄率降低了46.56%,凸缘区最大增厚率降低了30.71%;成形件的厚度分布更加均匀,均匀度提高了39.89%.

The deep drawing process of cylindrical cup was numerically simulated by ABAQUS to reveal the significant influence of friction properties of mold surface on thickness, strain and springback of the forming parts. On the surface of mold, there was an optimal distribution of friction properties. To improve the uniformity of part thickness, the optimal friction coefficients were acquired with μA, μC and μF of 0.12, μB of 0.26,μD of 0.09 and μE of 0.03, and the change of part thickness was only 27.99%. Based on optimal conditions, laser texturing and laser micro-texturing composite texture technology were used to actively design and manufacture the friction properties on the surface of cylindrical mold, and the deep drawing experiments were carried out. The results show that after composite laser texturing, the maximum reduction rate of round corner at the bottom of forming parts is reduced by 46.56% , and the maximum growth rate of the thicklless of flange is reduced by 30.71%. The thickness distribution of forming parts becomes more uniform with improved uniformity by 39.89%.