CAJ | 학술논문

结合钻杆接头螺纹的服役工况，针对大螺距异型螺纹，利用普通数控车床和专门制作的滚压装置微量滚压螺纹根部。结果表明，合适的滚压工艺参数能够提高牙根表面硬度(57 HV0.5)，表面粗糙度数值降低1个等级，显微组织出现了致密纤维层，金属表层得到强化，钻杆接头螺纹的疲劳寿命有所提高。
결합찬간접두라문적복역공황，침대대라거이형라문，이용보통수공차상화전문제작적곤압장치미량곤압라문근부。결과표명，합괄적곤압공예삼수능구제고아근표면경도(57 HV0.5)，표면조조도수치강저1개등급，현미조직출현료치밀섬유층，금속표층득도강화，찬간접두라문적피로수명유소제고。
Combined with the service conditions of the tool joint threads, aiming at the steep-pitch nonstandard threads, the root of screw thread was trace rolling by using CNC lathe and specialized made rolling device. The results show that the appropriate rolling process parameters can improve the hardness (57 HV0. 5) of root surface, reduce the surface roughness by two grades, and there are dense layer of fibers to appear in surface,by which the properties of metal surface are strengthened. The fatigue life of the drill pipe joint screw thread can be improved.