本文认为钻头大量报废(70%以上)是由于牙爪滚道表面过早产生疲劳剥落而使轴承先期损坏,因而选定了厚层碳氮共渗工艺来处理。试验过程中采用了高温分段碳氮共渗,达到了预期要求。通过铁矿现场生产试验,8支试验钻头平均使用寿命(总进尺)为709米,比同厂出品的采用渗碳工艺处理的同型号钻头(总进尺平均约200米)有大幅度的提高。 This paper argues that a large number of scraps (70% or more) are selected because of the thick carbonitriding process because of the premature failure of the bearing due to premature fatigue of the claw raceway surfaces. During the test, high-temperature segmented carbonitriding was used, which met the expected requirements. Through the iron ore production test, the average service life of the eight pilot drill bits (total footage) is 709 meters, which is substantially higher than that of the same type drill bits with the same carburizing process (with an average footage of about 200 meters).