基于仿真动臂焊接变形的控制方法

Welding Deformation Control of Moving Arm Based on Welding Simulation

挖掘装载机动臂存在突出的焊接变形问题,为了减小焊接变形,得到最优焊接顺序方案,利用热弹塑性有限元方法建立了有限元模型,并对挖掘装载机动臂结构焊接变形进行了数值模拟计算,分析了动臂结构的3种变形趋势,定量地对比了不同焊接顺序下动臂的最大焊接变形量,从而得到优化的焊接顺序。该顺序模拟结果表明,动臂最大挠曲变形量为8 mm,框架扭转变形量为4 mm,侧臂收缩变形为12 mm。通过对比预测的最佳焊接顺序下的变形模拟值和实测值,结果表明,两者吻合良好。

Backhoe Loaders arm exists a prominent question of welding deformation.To reduce this welding deformation and get the optimal scheme of tiger shaped structure welding sequence,the numerical simulation of welding deformation of arm structure for rear frame of Backhoe Loaders was conducted using thermo elastic-plastic method.The finite element model was established to analyze three kinds of deformation trend of arm structure and quantitatively calculate the distortion of different welding sequence,the optimal welding sequence of the whole structure was obtained.The results show that the maximum deflection distortion of side arm was 8 mm,the torsional deformation of frame was 4 mm,the in-plane shrinkage of side arm was 12 mm.The simulated values and measured values are compared under the optimal welding sequence,and the results show that they are in good agreement.