18CrNiMo7-6钢重载内齿轮渗碳淬火工艺

某减速器重载内齿轮要求进行渗碳淬火处理,因内齿轮结构属于大型薄壁零件,采用常规渗碳淬火方法进行处理后齿部畸变较大,磨齿后公法线尺寸不满足技术要求,造成工件报废。通过渗碳前增加去应力退火工序、增加渗碳时预热工艺、降低渗碳温度及降低冷却强度等方式,解决了重载内齿轮渗碳后齿部畸变超差问题,为薄壁重载内齿轮渗碳淬火提供了质量保证。

Carburizing and quenching process of 18CrNiMo7-6 steel heavy-duty internal gear

The heavy-duty internal gear of a reducer required carburizing and quenching treatment. Because the internal gear structure was a large thin-wall part, the tooth distortion after conventional carburizing treatment was large, and the common normal size after gear grinding could not meet the technical requirements, resulting in scrapping of the workpiece. By adding stress-relief annealing process before carburizing, increasing preheating process during carburizing, reducing both the carburizing temperature and the cooling intensity, the problem of tooth distortion deviation after carburizing of heavy-duty internal gear is solved, providing a quality guarantee for carburizing and quenching of the thin-wall and heavy-duty internal gear.