为能较准确描述激光扫描光斑温度分布和温度场特性,分析了扫描光斑的形成过程,应用温度场的叠加原理,导出了激光扫描转镜扫描光斑温度场的数学模型,用计算机模拟了不同参数下的温度曲线,讨论了参数对扫描宽带温度分布的影响。结果显示,扫描光斑温度场有明显的类趋肤效应。扫描光斑温度场的这一特征给出了激光扫描转镜能在较低功率下实现金属材料激光宽带表面强化的理论依据。所述方法也适用于其他形式的扫描叠加温度场。

In order to describe scanning facula temperature field and its characteristic exactly, the forming progress of scanning facula temperature field is analyzed in this paper, and the math model of the temperature field of point heat source scanning and superposing in the facula of laser repeating scanning line is built by applying the superposing principle of the temperature field,and the value simulation and figure description are given. The relationship between parameter and temperature distribution is studied, the result shows that the temperature field of scanning facula has obvious speciality similar to skin effect. The speciality is the theoretical basis for that wide band surface treatment can be done on material by laser scanning rotating mirror with lower laser power. The research method used is applicable to other temperature field that has the character of scanning and superposing process.