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一、前言较为重要的齿轮多用渗碳钢制造,并经渗碳、淬火和回火达到技术要求。齿轮各部位具有显著不同的曲率半径,因此渗碳后各部位的表面含碳量及渗层厚度和组织有较大差异,齿顶角处易出现碳化物聚集呈网状或半网状分布;齿根处渗层厚度要浅些。某些工厂生产的齿轮金相组织还不能稳定地达到技术要求,渗碳后在缓冷中出现脱碳现象,使淬火后硬度偏低,耐磨性差,易被擦伤且疲劳强度低,使用寿命短。齿轮的形状复杂,渗碳淬火后往往出现较大的变形,从而影响齿轮的传动精度、接触精度和传动平稳
First, the foreword The more important gear multi-purpose carburized steel, and by carburizing, quenching and tempering to meet the technical requirements. The various parts of the gear have significantly different radius of curvature. Therefore, the surface carbon content and the thickness and microstructure of the carburized layer vary greatly after carburizing. The carbides appear to be reticular or semi-reticular distribution at the addendum angle. Tooth root seepage layer thickness to be shallow. The gear metallurgy organization produced in some factories can not reach the technical requirements stably. After carburizing, the decarburization occurs in the slow cooling, so the hardness after quenching is low, the wear resistance is poor, the abrasion is easy and the fatigue strength is low. Short life expectancy. Gear shape is complex, often after carburizing quenching large deformation, thus affecting the gear transmission accuracy, contact accuracy and smooth transmission