激光表面微织构工艺试验及应用研究

Experimental Investigations on Laser Surface Micro-texturing Technology and Application

在声光调 Q 二级管泵浦固体光源 Nd：YAG 激光器基础上,采用“ 单脉冲同点间隔多次冶 激光微加工工艺,对 45#钢试样表面进行激光微织构加工。 分析了离焦量、泵浦电流、重复频率及重复次数对微织构形貌的影响规律。 工艺试验表明, 微凹腔的直径和深度随着泵浦电流的增大而增大,随着重复频率的增加呈减小的趋势,微凹腔深度随脉冲次数的增加呈近似线性增加,而微凹腔直径呈缓慢减小趋势。 通过对某型号四缸汽油机的台架性能试验研究,表明与传统平顶机械珩磨相比,采用激光珩磨技术的汽油机机油耗要比原机降低 56% , 燃油耗降低 1 . 94%-4 . 5% 。

The 45# steel sample surfaces were textured with single pulse interval laser micro-machining method by a Q switched diode-pumped solid-state Nd：YAG laser. The effect of the defocus diversity, pump currents,repetition frequency and repetition times on micro-machining profile was discussed. The test shows that the dimple diameter and depth increase while pump currents are increased. The dimple diameter and depth decrease while laser repetition frequency is increased. The dimple depth increase linearly and the dimple depth decrease slowly, while laser pulse repetition times are increased. With the laser texturing of the four cylinder-bore surfaces of the Gasoline Engine, the fuel consumption is reduced by 1.94% -4.5% and the oil consumption is reduced by 56%, comparing with traditional plateau honing technology.