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以某排放型单缸柴油机油泵凸轮为研究对象,对其表面进行激光微织构加工,通过发动机台架耐久性试验和表面磨损量检测考察织构化凸轮的耐磨性以及对发动机可靠性的影响,并论证球墨铸铁代替钢作为凸轮材料的可行性。研究结果表明:经过300 h全速全负荷的耐久性试验,球墨铸铁型激光微织构凸轮,其表面磨损量仅2 m左右,相对于非织构区域,激光加工区域附近的硬度明显提高,耐磨性能得到有效改善;同时样机的动力性能、排放性能以及经济性能都保持良好,未出现功率缺失等不良现象,验证了球墨铸铁型织构凸轮的可靠性。
Taking a discharge single-cylinder diesel engine oil pump cam as the research object, laser micro-texture machining was carried out on the surface of the discharge cam. The wear resistance of the textured cam and the reliability of the engine were investigated through the durability test of the engine bench and the surface wear test. Influence, and demonstrate the feasibility of ductile iron instead of steel as a cam material. The results show that after 300 h full-speed full-load durability test, the ductile iron-based laser micro-textured cam has a surface wear of only about 2 m. Compared with the non-textured area, the hardness near the laser-processed area is obviously increased. The grinding performance is effectively improved; at the same time, the dynamic performance, emission performance and economic performance of the prototype are maintained well, no power shortage and other undesirable phenomena appear, and the reliability of the ductile iron textured cam is verified.