激光热处理光束优化系统

Beam Optimum System for Laser Heat Treatment

激光束的光强分布以及光斑形状对激光热处理硬化层性能影响极大,一般要求光强均布的矩形光斑或宽带光斑;但是光强均布的激光束不一定产生均匀的硬化层,目前的激光热处理光束优化装置得到的是中间厚,两边薄的月牙形分布硬化层。为了改善激光热处理硬化层分布的均匀性,在分析国内外激光热处理光束优化系统研究现状及存在问题的基础上,提出了光束优化系统的两种方案,激光扫描环形光斑和线形光斑。建立了两种光斑温度场的数学模型,模拟了温度场分布。从理论上说明了两种方案能够改善激光热处理硬化层分布均匀性。

It is great that the influence of laser beam intensity distribution and its shape on laser hardened layer performance. Rectangle facula or wide-band facula are applied widely. But laser beam of uniform intensity distribution can not always generate uniform hardened layer. At present, using general laser heat treatment beam optimum equipment, the distribution shape of laser hardened layer was crescent. Based on the analysis of research on beam optimum system for laser heat treatment in the world, two different methods on laser beam optimum are present in order to improve distribution uniformity of hardened layer. Laser scanning ring facula and linear facula are analyzed in the new methods. The mathematic models of laser beam optimum are built and their temperature field distributions are simulated. The distribution uniformity of the hardened layer is improved.