摘要
对驱动轴的断口进行了试验及分析。结果表明:驱动轴显微组织、硬度、化学成分均符合技术要求,裂纹起源于法兰盘的R圆角部位,断口上有波浪状的疲劳扩展纹。淬火感应器在R角处加热时间过长,该处淬硬层过深以及法兰盘区域的淬火直径过大,是造成开裂的主要原因。采取的改进措施是减少感应器在该位置的加热时间和提高中频机床的淬火频率。经实际验证,改进后的驱动轴服役21万km至今完好,说明失效问题得到了解决。
The fracture surface of driving shaft was tested and analyzed. The results show that the microstructure,hardness and chemical composition of the driving shaft all meet the technical requirements. The crack originates from the R fillet of the flange, and there are wave like fatigue growth lines on the fracture surface. The main reason for the crack is that the quenching inductor is heated too long time at the R angle, which leads to the too deep hardening layer and the too large quenching diameter in the flange area. The improvement measures adopted are to reduce the heating time of the inductor at this position and to increase the quenching frequency of the intermediate frequency machine tool. After the actual verification,the improved drive shaft service of 210000 km so far is intact, indicating that the failure problem has been solved.
作者
李向东
LI Xiangdong(Quality Management and Development Planning Division,Jiaozuo University,Jiaozuo 454000,China)
出处
《热加工工艺》
北大核心
2020年第18期154-156,共3页
Hot Working Technology
关键词
驱动轴
加热时间
内应力
频率
淬硬层深
driving shaft
heating time
internal stress
frequency
hardened layer depth
