转向连接销热处理工艺研究

摘要

为避免某重型载货汽车前桥上的转向连接销(40CrH钢)产生淬火裂纹,同时满足金相组织要求,采用水溶性淬火介质(PAG类聚醚)进行了淬火工艺试验.结果表明,采用淬火温度为840℃、水溶性淬火溶液浓度为8％～10％及温度为20～50℃的新工艺进行淬火效果最佳,无淬火裂纹产生,累计生产的50万件转向连接销均未出现质量问题.%To prevent quenching crack of steering pin (40CrH steel) on the front axle of a heavy truck and satisfy the requirement of metallurgical structure,quenching test was carried out with water soluble quenching liquid (PAG polyether).Test results show that the optimum quenching effect can be obtained at temperature of 840 ℃,8％～10％ concentration of water soluble quenching liquid and the temperature of 20～50 ℃,under such conditions,no quenching crack appears,no quality problem occurred for the total 500,000 steering pins produced.