激光表面微造型工艺试验与应用.pdfVIP

2 0 0 7年12月 农 业 机 械 学 报 第38卷第12期 激光表面微造型工艺试验与应用* 华希俊 符永宏 袁 润 王 霄 一 上 【摘要】 在声光调Q二级管泵浦固体光源(DPSS)Nd：YAG激光器基础上，采用“单脉冲同点间隔多次”激光 微加工工艺，对灰铸铁材料表面进行微造型加工。分析了激光波长、光斑距离、重叠面积系数及重复频率对微造型 质量的影响。试验研究表明，该工艺能有效防止金属熔融和重铸现象，获得较为理想的微腔形貌和表面质量。分析 了微加工断面形貌，表明微腔(槽)表面留有一层与基体结合良好的硬化层。通过4L88型柴油机激光珩磨缸套的性 能试验研究表明，与普通平顶珩磨缸套相比，采用激光珩磨缸套，柴油机机油耗降低39．3 ，漏气量降低3O％，PM 排放降低 18．8 。 关键词：激光表面微造型 激光珩磨 试验 中图分类号：TH117．i；TG163．99 文献标识码：A Experimental InVestigati0ns on Laser Surface Micro—texturing Technology Hua Xijun Fu Yonghong Yuan Run Wang Xiao Cai Lan (Jiangsu University) Abstract The experimental results revealed that it is practicable to machine gray cast iron with single 蔡 pulse interval laser micro—machining method by a Q switched diode—pumped solid—state(DPSS) Nd：YAG laser．The effect of laser parameters(wavelength，light spot distance，overlap area factor and repetition frequency)on micro—machining quality was discussed．A desired micro— structure and surface quality could be achieved to overcome the adverse effect of therma1 diffusion and prevent the melting and recasting efficiently．The section SEM of cutting grooves with JXA一 840A was also analyzed．It is found that the treated layers of grooves have good joining state on the base meta1．The optimized technology has been applied in the laser honing experiment．With the laser texturing of 4L88 diesel cylinder—bore surface，the oil consumption was reduced by 39．3 ，the emission of combustion engines was reduced by 30 ，and the particulate emission was reduced by 18．8％，comparing with traditional plateau honing． Key words Laser surface texturing，Laser honing，Experiment 技术(