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激光在对材料作用过程中,光斑会带来急剧的温度变化,从而产生热变形,影响制造精度。为了预测和控制热变形,需要研究相关的变形情况及规律。建立了脉冲激光作用下Q345平板热变形的三维模型,使用有限元软件Sysweld进行了模拟,得到了变形场,并对其进行实验验证。结果表明:2 mm钢板的模拟结果与实验结果一致性很高。由此对2 mm薄钢板在不同参数下的热变形进行了模拟预测,分别得到激光作用速度,激光热源输入以及激光光斑直径与热变形翘曲角之间的函数关系式,得到变形规律。同时,通过对中厚钢板在脉冲激光作用下热变形的有限元模拟与实验,得到了其变形情况。
Laser in the role of materials, the spot will bring rapid temperature changes, resulting in thermal deformation, affecting the manufacturing accuracy. In order to predict and control thermal deformation, it is necessary to study the relevant deformations and laws. A three-dimensional model of thermal deformation of Q345 plate under pulsed laser was established. The finite element software Sysweld was used to simulate the deformation and the deformation field was obtained. The results show that the simulation results of 2 mm steel plate are in good agreement with the experimental results. The thermal deformation of 2 mm thin steel plate under different parameters was simulated and predicted. The function of laser speed, laser heat source input, laser spot diameter and warpage deformation angle were obtained, and the deformation law was obtained. At the same time, through the finite element simulation and experiment on the thermal deformation of medium-thick steel plate under pulsed laser, the deformation of the plate is obtained.