苏余鹏
,
王秀凤
,
陈光南
,
胡世光
,
材料科学与工艺
doi:10.3969/j.issn.1005-0299.2004.05.026
对激光弯曲变形机理问题进行了探讨,提出了激光弯曲的变形机理本质上是温度梯度机理,反向弯曲机理和增厚机理是当材料厚度方向的温度梯度很小时,针对不同厚度的材料而出现的现象.实验发现有限厚度材料在激光辐照作用下,其内部产生了用经典傅里叶定律无法解释的非常规温度分布,将其定义为泛傅里叶效应,用于进一步揭示激光弯曲机理的实质.
关键词:
激光弯曲机理
,
温度梯度机理
,
泛傅里叶效应
Y.J. Shi
金属学报(英文版)
Laser forming is a new flexible and dieless forming technique. To achieve the high accuracy forming, the temperature gradient mechanism (TGM) is studied. In the analysis of TGM, the plate bends about x-axis and about y-axis as well. To understand the deformation trend, the numerical simulation of deformation of plate is conducted by choosing different laser powers, laser spot diameters, scanning speeds, lengths, widths and thicknesses. From the results of simulation, it can be seen that the laser spot diameter, the scanning speed, laser power and thickness of plate play dominant roles in the laser forming process. However, the bending angles αx and αy show different trends with the variation of parameters. In addition, in comparison with above four parameters, the effect of length and width of plate on the bending angle may be neglected, but their effects are significant for the bending radius R.
关键词:
aser forming
,
温度梯度机理
,
金属板材
