摘要
利用扫描电镜、直读光谱仪和维氏硬度计检测方法研究了花键轴的微观组织、化学成分和齿部硬度。结果表明:花键轴的化学成分符合技术要求,花键齿部硬度只有28 HRC,远低于技术要求,不能有效抵抗塑性变形和外界磨损,这是导致花键轴早期断裂的根本原因;齿部在感应淬火冷却过程中发生了高温转变,这可能是冷却不足造成的。对其热处理工艺进行了改进,延长了感应器的喷水冷却时间。经过实践验证,工艺改进后的花键轴硬度符合技术要求。
The microstructure,chemical composition and tooth hardness of spline shaft were studied by means of scanning electron microscope,direct reading spectrometer and Vickers hardness tester.The results show that,the chemical composition of the spline shaft conforms to the technical requirements,and the hardness of the spline teeth is only 28 HRC,which is much lower than the technical requirement.And it can not resist plastic deformation and the cooling process of induction quenching external wear effectively,which is the root cause of the early fracture of spline shaft.The high temperature tran sformation of the teeth occurs during,which may be due to insufficient cooling.The heat treatment process was improved to prolong the spray cooling time of the inductor.It is proved by practice that the hardness of the improved spline shaft meets the technical requirements.
作者
卢松涛
陈再胜
陈海俊
LU Songtao;CHEN Zaisheng;CHEN Haijun(Shool of Mechanical Engineering,Shangqiu Insititute of Technology,Shangqiu 476000,China)
出处
《热加工工艺》
北大核心
2019年第6期259-261,共3页
Hot Working Technology
基金
河南省第八批重点学科"机械制造及其自动化"资助项目(2012SJGLX289)
关键词
花键轴
硬度梯度
失效分析
异常组织
高温转变
spline shaft
hardness gradient
failure analysis
abnormal microstructure
high temperature transition
