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Temperature conditions for laser thermal forming process

机译：激光热成型工艺的温度条件

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摘要

Studies on touchless bending of metal plates by use of laser beam are presented. Laser beam is modelled as a heat source of finite dimensions moving over the plate surface. The analytical approximation of Ashby and Easterling of the temperature field in material is adopted, so continuous temperature distribution in the material yield region is considered. The bend angle is investigated as a function of processing parameters, material parameters and initial material temperature. The derived solutions for bend angle are used to analyse the dependence of the bend angle on initial material temperature. The theoretical results are compared with the experimental value of the bend angle for different materials. The optimum value of initial temperature is found when the bend angle is maximum. This dependence helps to derive the critical temperature at which the material yield stress limit can be assumed zero. It is an important material parameter for optimization and control of initial and surface temperatures of the thermal bending process.
机译：提出了利用激光束对金属板进行非接触弯曲的研究。激光束被建模为在板表面上移动的有限尺寸的热源。采用材料温度场的Ashby和Easterling解析近似值，因此考虑了材料屈服区域的连续温度分布。根据加工参数，材料参数和初始材料温度来研究弯曲角度。导出的弯曲角解可用于分析弯曲角对初始材料温度的依赖性。将理论结果与不同材料弯曲角的实验值进行比较。当弯曲角度最大时，找到初始温度的最佳值。这种依赖性有助于导出临界温度，在该临界温度下材料屈服应力极限可以假定为零。它是优化和控制热弯曲过程的初始温度和表面温度的重要材料参数。

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