【摘要】 管材激光弯曲成形是一种柔性金属塑性成形方法,将连续的激光光斑简化为一间歇跳跃的方形面热源,并且考虑材料性能参数与温度的相关性,建立了管材激光弯曲成形的热-机耦合有限元工艺仿真模型。有限元仿真结果表明:同板料的激光弯曲成形一样,对应于加热和冷却阶段,管材的激光弯曲成形也分别经历反向弯曲和正向弯曲两个变形阶段,管材激光弯曲成形的内在机理是典型的温度梯度机理。更多还原

【Abstract】 Laser bending of tubes is a flexible metal forming process.A thermo-mechanical FEM model of the Laser bending of tubes is established.The continuous laser spot is simplified as a square heat resource with an intermittent and jumping movement.The relativity between material’s properties and temperature is considered.Based on the FEM model,the process of laser bending of tubes is analyzed numerically.Being similar to laser bending of sheets,different deformation stages also appear with the laser spot scanning.One is reverse bending that is away from the laser beam during the heating stage,another is forward bending that is towards the laser beam during cooling stage.The mechanism of laser tube bending is typical temperature mechanism.更多还原