管件弯曲过渡区研究及回弹控制

Research on bending transition zone of tube and springback control

针对小直径厚壁管件,把成形部分沿长度方向划分为曲率过渡区和稳定区,利用有限元数值模拟分析了工艺参数(进给速度、弯曲速度和扭转速度)对管件过渡区曲率的影响,建立了管件弯曲角和稳定区曲率的关系。通过自主研发的空间管件数控弯曲设备,基于DMC2210运动控制卡,使用C++软件中MFC模块编写控制程序和操作界面进行加工试验,并验证了加工后的圆柱螺旋管件和空间变曲率管件的有效性。结果表明:管件加工误差在合理范围内,基本满足设计和使用要求。

Aiming at the small-diameter thick-walled tube,the forming zone was divided into curvature transition zone and stability zone along the length direction.The influences of process parameters such as feeding speed,bending speed and torsion speed on the curvature of transition zone were analyzed by using finite element numerical simulation.The relationship between the bending angle and the curvature of stability zone of tube was established.Based on DMC2210 motion control card,MFC module in C++software was used to write the control program and operation interface for processing test through the self-developed spatial tube numerical control bending equipment.The validity of the processed cylindrical spiral tube and spatial variable curvature tube was verified.The results show that the mismatching tolerance is within a reasonable range,which can basically meet requirements of design and use.