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矿用牙轮钻头牙爪和轴承滚柱组成的滚动摩擦副的低耐磨性是轴承系统早期失效的主要原因。分别对牙爪大滚道用钢EX30和滚柱用钢55SiMoV设计不同的渗碳表面碳含量及淬火表面硬度,通过摩擦副的正交磨损试验和显微组织观察分析剥落磨屑的形貌,确定影响摩擦副耐磨性的主次因素和最佳耐磨性的渗碳淬火质量指标匹配。结果表明,影响摩擦副耐磨性的主次因素依次为EX30钢表面碳含量,55SiMoV钢淬火硬度,EX30钢淬火硬度;最佳耐磨性的匹配为EX30钢表面碳含量为1.0%~1.1%且表面硬度为58~59 HRC,55SiMoV钢表面碳含量为0.80%~0.90%且表面硬度为59~60 HRC;磨损形式为表面接触疲劳浅层剥落。
The low wear resistance of the rolling friction pair consisting of the claw of the roller cone bit and the bearing roller is the main reason for the early failure of the bearing system. The carbon content and quenched surface hardness of carburized surface were designed respectively for the claw roller steel EX30 and roller steel 55SiMoV. The morphology of the spalling debris was analyzed by orthogonal wear test and microstructure observation of the friction pair, Identify the primary and secondary factors that affect the wear resistance of the friction pair and match the quality indicators of carburizing and quenching for the best wear resistance. The results show that the primary and secondary factors affecting the wear resistance of the friction pair are as follows: the surface carbon content of EX30 steel, the quenching hardness of 55SiMoV steel and the quenching hardness of EX30 steel; the optimal wear resistance is that the surface carbon content of EX30 steel is 1.0% -1.1% And the surface hardness of 58-59 HRC, 55SiMoV steel surface carbon content of 0.80% to 0.90% and a surface hardness of 59 ~ 60 HRC; wear form of surface contact fatigue shallow peeling.