大螺距异型螺纹牙根的微滚压强化技术
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摘要
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。
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.
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.
引文
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[2]周佳成.提高螺纹连接件抗疲劳寿命的方法[J].科技通报,2005,21(4):434-436.Zhou Jiacheng.Methods of improving the anti-fatigue life of threaded connecting pieces[J].Bulletin of Science and Technology,2005,21(4):434-436.
[3]胡春燕,姜涛,刘新灵.某钢制螺钉断裂失效分析[J].金属热处理,2014,39(2):141-144.Hu Chunyan,Jiang Tao,Liu Xinling.Failure analysis of steel screws[J].Heat Treatment of Metals,2006,31(8):18-20.
[4]张耀辉,王启民,王秀梅,等.石油钻杆接头螺纹的数控修复加工方法[J].中国机械工程,1999,10(6):633-635.Zhang Yaohui,Wang Qimin,Wang Xiumei,et al.Renovation of threadson rotary shouldered connections for petroleum industry by NC machining[J].China Mechanical Engineering,1999,10(6):633-635.
[5]赵曼,任艺.提高螺栓抗拉疲劳性能的措施[J].水利电力机械,2006,28(8):32-35.Zhao Man,Ren Yi.Methods of improving the anti-fatigue properties of bolts[J].Water Conservancy&Electric Power Machinery,2006,28(8):32-35.
[6]范建增,张西坤.常用钻具接头螺纹综合分析[J].中国集体经济,2011(22):180-181.
[7]张秀林,金铮.螺纹滚压强化疲劳断口的分析[J].北京科技大学学报,1997,19(4):374-377.Zhang Xiulin,Jin Zheng.Analysis of screw rolling strengthening on fatigue[J].Journal of University of Science and Technology Beijing,1997,19(4):374-377.
[8]何嘉武,马世宁,巴德玛.表面滚压强化技术研究与应用进展[J].装甲兵工程学院学报,2013,27(3):75-81.He Jiawu,Ma Shining,Ba Dema.Research and application progress of surface rolling strengthening technology[J].Journal of Academy of Armored Force Engineering,2013,27(3):75-81.
[9]李鹤林,冯耀荣,李京川,等.钻杆接头和转换接头材料及热处理工艺的研究[J].石油机械,1992,20(3):1-6.Li Helin,Feng Yaorong,Li Jingchuan,et al.Materials and heat treatment processes for tool joints and subs[J].CPM,1992,20(3):1-6.
[10]陈再良,吕东显,曹明宇,等.金属热处理残余应力与开裂失效关系的探讨[J].金属热处理,2007,32(z):40-44.Chen Zailiang,LüDongxian,Cao Mingyu,et al.Study on residual stress and crack failure in metal heat treatment[J].Heat Treatment of Metals,2007,32(z):40-44.