众所周知,牙爪轴颈受力部位的表面渗碳层发生疲劳、剥落是矿用牙轮钻头早期损坏的主要原因。国内的一些单位曾对牙轮钻头牙爪轴颈表面剥落问题做了很多研究,选用较好的钢材进行室外试验测定,并根据结果提出了一些改进措施。本文根据用国产20Cr Mo 钢,制造的 KJY250钻头(直径φ250毫米),探讨了不同的处理过程对20Cr Mo 钢制牙爪轴颈表面早期剥落的影响,提出了提高20Cr Mo 钢制牙爪轴颈寿命,防止过早剥落的措施。 It is well known that the carburizing layer on the surface of tooth claw shaft neck is fatigue, and the spalling is the main reason for the early damage of mine roller cone bit. A number of domestic units have done a lot of research on the flaking of the tooth claw journal surfaces of the roller cone drill bits, and selected better steel for the outdoor test, and put forward some improvement measures according to the results. Based on KJY250 drill bit (diameter of 250 mm) made of domestic 20Cr Mo steel, the effects of different treatment processes on the early spalling of 20Cr Mo steel claw shaft neck surface were discussed. Life expectancy, measures to prevent premature spalling.