煤矿机械CoalMineMachineryVol.34No.11Nov.20133411201311SimMechanics,,。:[1].[J].,2003(2):38.[2].[J].,2013,34(5):179-181.[3].[J].,2010(S1):86-87.:(1973-),,,,,:,:541646795@qq.com.::2013-06-17 0,。,。,,。,,,。20125,4000准63×73×10005°,60m,30d4。20127,32006°,100m,30d5。,,,。11.1结构,1。11.2.3.1.2焊缝强度计算,(),准63×73×1000。1,,,:(1)M1(2(a))M1=6r乙θ乙τbrcosθd乙乙θdddrrcosθ(1)θ———1/2,θ=arccos28.7536.50=38.032°;1,2(1.,400039;2.,400039):钻机在煤矿井下钻孔松软煤层过程中,手工焊接的合金结构钢三棱钻杆频繁发生焊缝断裂,丢失钻杆,延误工期。通过理论计算和实验对比,分析查找产生问题的原因。结合三棱钻杆的结构特点、生产条件和使用要求,重新设计了焊接工艺,严格操作要求,新焊接的三棱钻杆经过质量检验和工业性试验,质量可靠。:合金钢;三棱钻杆;焊接工艺:TD421.2:A:1003-0794(2013)11-0116-03TriangularDrillPipeAlloySteelWeldingProcessResearchWANGXiao-lin1,2(1.GasDisasterMonitoringandEmergencyTechnologyNationalKeyLab,Chongqing400039,China;2.ChongqingResearchInstituteofChinaCoalTechnologyandEngineeringGroupCorporation,Chongqing400039,China)Abstract:Theweldjointofthetriangulardrillpipeweldedmanuallyistendtocrackwhiledrillinginthesoftcoalbed,leadingtothedropofdrillpipe,thecostincreaseandthedelayoftheprojecttime.Bytheoreticalcalculationandexperimentalcomparison,thecauseofthecrackhasbeenfound,anewweldingprocessisproposedinconsiderationofthecharacterofthetriangulardrillpipeandtheproductioncondition,alsotheoperatingrequirement.Thenewpipeisverifiedwithgoodqualitybyinspectionandindustrialtest.Apracticalproblemhasbeensolved,whichisinstructiveindrillpipeproduction.Keywords:alloysteel;triangulardrillpipe;weldingprocess·12340°5552-40°116DOI:10.13436/j.mkjx.2013.11.0863411Vol.34No.11———r———,mm(rmax=28.75,rmin=20.75);τb———,MPa,τb=0.577σb,J507σb=490MPa。(1),M1=6τbrmaxrmin乙r2drθ0乙tgθdθ=6559Nm(2)M2(2(b))M2=r1r2乙τb(2πrdr)×r3360°-2×3×38.032°=131.808°。M2=13.808360rmax′rmin′乙τb(2πrdr)×r′=5524Nmr———,mm,(rmax′=36.5,rmin′=28.5)。,M=M1+M2=12083Nm。,,,准63×73×100012083Nm,4000Nm,3,。(a)(b)21.3断裂原因,,,。,,。;,。,,。42CrMo,40Cr,,J857CrNi,,。,,,。240Cr42CrMo40Cr42CrMo,CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15,40Cr0.79%,42CrMo0.87%。,>0.60%,,。,,。,,,,,,,,。,、、。40Cr42CrMo,,,,。,。。,。1。。3,。。、。(1)V,25°,8mm(3)。,。,5mm。,()3准10.3mm(4),,H08Mn2SiA准1.2,CO2,100~125A。3R36.5R28.5r=28.75θ20.75R36.5R28.520.75θr25°准73准57±0.1准7325°25°25°5+0.301174(2)40Cr42CrMo,3.2mmJ507,。350℃1h,2h,,。(3)40Cr42CrMo,。,,300℃,,,。,,,。2,110~130A,25~30V。,,<1mm,3mm,、、。,,。,,2。、、、,,。(4),:,,≥200mm。,,,。24h,100℃。560℃,1.5h,,。4,、、。++。准63×73×1000()QC/T293-1999《》,13061Nm,,1.2。520128,准63×73×1000。130,40d,44,3737m,130m,。6(1)、,,。,,;(2),,;(3),,,,,。:[1][],.[M].,.:,1981.[2].[M].3,:,1992.[3].[K].5,:,2010.[4].2[K].3,:,2009.:(1972-),,,,:,:023-68683500,:1997015@cqccteg.com.::2013-06-17≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥≥3411Vol.34No.11———准7325°6-准2020206-准10.30.5:()、、、。。。2011712118