CAJ | 학술논문

采用优化的激光工艺参数和相应辅助工艺措施,利用调Q灯泵浦Nd：YAG激光器加工出不同几何尺寸和分布的球冠状激光毛化形貌。在UMT-Ⅱ型多功能摩擦磨损试验机上进行了不同尺寸和分布的激光毛化形貌与光滑试样表面的摩擦学对比实验研究。研究结果表明：在三种工况下,激光毛化试样的摩擦因数明显大于光滑试样的摩擦因数,其中,在高速轻载工况下,微凸体间距为1300μm的试样比光滑试样的摩擦因数大2.25倍;摩擦因数随着激光毛化形貌微凸体间距的减小而增大,间距为1300μm时摩擦因数最大,达到0.1192;摩擦因数与激光毛化微凸体直径成反比关系,而与微凸体的高度成正比关系;随着速度的不断增大,激光毛化表面动压效应增强,摩擦因数随之减小。
채용우화적격광공예삼수화상응보조공예조시,이용조Q등빙포Nd：YAG격광기가공출불동궤하척촌화분포적구관상격광모화형모。재UMT-Ⅱ형다공능마찰마손시험궤상진행료불동척촌화분포적격광모화형모여광활시양표면적마찰학대비실험연구。연구결과표명：재삼충공황하,격광모화시양적마찰인수명현대우광활시양적마찰인수,기중,재고속경재공황하,미철체간거위1300μm적시양비광활시양적마찰인수대2.25배;마찰인수수착격광모화형모미철체간거적감소이증대,간거위1300μm시마찰인수최대,체도0.1192;마찰인수여격광모화미철체직경성반비관계,이여미철체적고도성정비관계;수착속도적불단증대,격광모화표면동압효응증강,마찰인수수지감소。
Using optimized laser processing parameters and the corresponding auxiliary craft measures,die steel samples were textured by a Q switched ling-pumped Nd：YAG laser in the form of slight protuberance similitude of spherical cap with different sizes and distribution of micro-convex.The tribological properties of laser surface textured die steel samples as well as untextured die steel specimen were comparatively investigated on a UMT-Ⅱ trib-meter.Results show that the friction coefficient of laser surface textured samples is obvious larger than that of untextured specimen.It is found that the friction of textured sample with 1300μm span is about 2.25 times over that of an untextured sample.The tribological friction increases with the decrease of span among the micro-convexes.The maximum friction is 0.1192 when the span is 1300μm.The tribological friction is inversely proportional to the diameter of micro-convex but directly proportional to the diameter of micro-convex.The friction decreases with the increase of speed,that is because the hydrodynamic effect increase with the speed increase.