YAG激光诱导组合脉冲放电对材料表面强化的研究

为了增加激光诱导放电坑强化层深度,同时考虑降低由于表面严重气化导致能量的损耗,研究了激光诱导组合脉冲放电的技术。采用多激光诱导放电的方法,通过在脉冲放电过程中增加脉冲激光个数,来增强通道后期激光诱导的能力;采用增加放电脉冲个数的方法,通过控制加工点的温度来控制放电能量的输入方式,减少能量的集中度,来增加强化层深度。结果表明,通过增加诱导激光脉冲个数,放电坑直径从原来的690μm降为652μm,强化层深度从85μm增加到100μm,通过将1个单脉冲改为一定间隔的3个子脉冲,放电坑直径降为653μm,强化层深度增加到92μm。该方案适合机械部件的表面强化加工。

Investigation on the material surface strengthened by YAG laser guiding combined-pulse discharge

The method of the laser guiding combined-pulse discharge was studied to increase the phase-change layer depth of the laser guiding discharge pit, and avoid the energy loss induced by serious material surface vaporization. This method includes two schemes. One is increasing laser pulse numbers in the process of discharge to enhance the ability of the laser guiding. The other is increasing discharge pulses,in which the input of discharge energy is controlled by the temperature of the machining point so that the energy concentration is reduced and the depth of the strengthening pit is increased. The results showed that the diameter of the discharge pit reduced from 690μm to 652μm and 653μm, and the depth increased from 85μm to 100μm and 92μm, if increasing laser pulse numbers in the late discharge pulse and combining laser and discharge pulses respectively.These methods are applicable for the surface strengthening process of mechanical components.