摘要
摩擦副表面存在着与其润滑性能要求优化匹配的微观几何形貌。本文以发动机的气缸/活塞环为具体研究对象,基于气缸的摩擦磨损特征和润滑理论,对其表面的微观几何形貌进行了初步设计。采用半导体泵浦YAG固体激光器,在硼铸铁试样上进行了激光微造型加工工艺试验,系统研究了激光波长、激光功率、脉冲宽度、重复频率、扫描速度、重叠系数及辅助气体等,对金属材料激光微加工质量和效率的影响规律。并首次提出了“单脉冲同点间隔多次”激光微加工新工艺。最后,采用优化的激光参数组合,成功地在实际缸套内表面,加工出所设计的高质量表面微观几何形貌。
On surface of frictional units, the regular micro - geometric structure which can be well matched to the needs of lubrication is obtained. In this paper, researching on the frictional units of cylinder liner/piston ring, according to the property of wear - resistance of cylinder liner and the lubrication theory, the micro - geometric structure on surface of frictional units is preliminarily designed. A pulsed laser beams generated by Nd ： YAG laser is adopted to do the experiment. According to the systemic research on laser micromachining on samples of boron cast iron, the influence rules of laser parameter and assistant condition （such as： laser wavelength, focus point width, average power, pulse width, repetition frequency, scan rate, overlap coefficient, assist gas pressure, etc. ） on the quality of micro - structure has been obtained. Consequently, the new laser processing crafts of ＂single pulse at a time, repeat at intervals＂ has been presented by our research group. In the end, using the optimized combination of the laser parameters, the regular micro - geometric structure designed previously has been processed on the inner - wall of cylinder liner.
出处
《应用激光》
CSCD
北大核心
2006年第4期233-236,共4页
Applied Laser
基金
国家自然科学基金项目(50475122)
江苏省高校自然科学研究计划重点项目(03KJB480019)
镇江市工业科技攻关项目(GY2005018)资助
关键词
气缸
微观形貌
激光加工参数
新工艺
cylinder, regular micro -geometric structure, laser parameters, new crafts
