履带式拖拉机、推土机、挖掘机以及其他机械的易损零件,由于它们的耐磨性低,致使检修期限缩短,机组停工时间增加,并且需要大量的备用件。为保证拖拉机的正常运行,国家每天都要生产数以千百万计的闸瓦托、链环以及履带轴销。 改进零件的结构、合理选材、正确选用热处理及化学热处理工艺、加工硬化或者综合运用这些方法等等是提高零件持久性能的常用方法。 Crawler tractors, bulldozers, excavators and other vulnerable parts of machinery, due to their low wear resistance, result in reduced inspection times, increased downtime of the units and the need for a large number of spare parts. To ensure the normal operation of tractors, the country produces millions of brake watts, links and track shaft pins every day. Improve the structure of the parts, the rational selection, the correct choice of heat treatment and chemical heat treatment process, work hardening or a combination of these methods and so on is to improve the lasting performance of the common method.