圆管弯曲加工过程的数值模拟

The Simulation of Tube Bending Forming Processes

采用显式有限元分析软件LS -DYNA ,对于圆形钢管的弯曲加工过程进行数值模拟。圆管弯曲加工模型是常见的回转引伸弯曲加工方式 ,并在分析模型中考虑了阻止钢管在弯曲加工过程中起皱和截面扁平化的芯轴 ,以及为了防止钢管弯曲的外侧的壁厚过分减薄在钢管的末端加上压力。通过数值模拟得到管壁的最大减薄和增厚部位 ,并讨论了芯轴的摩擦系数和钢管末端的压力对管壁厚度变化的影响。

The tube bending forming processes are simulated by explicit finite element code LS-DYNA. The model that tube is bent in a rotary machine is adopted. The mandrels are used to prevent excessive flatting and winkling and a press force on the end of tube is used to prevent excessive thinning. The places of maximum thinning and thickening strains on the tube are obtained by the simulation. The influences of friction coefficient between tube and mandrels and the press force on the end of tube for thickness change of tube are discussed.