我厂生产的机床齿轮、离合器、轴类零件大部分都经高频表面淬火,过去采用 0.25%聚乙烯醇水溶液淬火介质,虽然可以减少开裂倾向,但其冷却能力受温度和浓度的影响极不稳定,易起泡,长期使用变质老化,喷射孔经常被形成的塑料膜所堵塞。为此,我们改用0.3%三乙醇胺水溶液为淬火介质,两年3万多件产品零件实践证明,表面淬火硬度均匀,无开裂,使用效果良好。例如,X62W万能铣床的一根40Cr钢齿轮轴,两 I plant the production of gear, clutch, shaft parts are mostly high-frequency surface hardening, the past use of 0.25% aqueous solution of polyvinyl alcohol quenching medium, although it can reduce the tendency of cracking, but its cooling capacity by the temperature and concentration of extremely Stable, easy to blister, long-term use of metamorphic aging, the injection hole is often blocked by the formation of plastic film. To this end, we use 0.3% aqueous solution of triethanolamine as the quenching medium, more than 30,000 pieces of product for two years proved that the surface hardness of the quenching uniform, no cracking, the use of good results. For example, a 40Cr steel gear shaft for the X62W universal milling machine, two