题目F125曲轴左部零件的机加工艺及铣夹具设计英文并列题目F125crankshaftleftpartsmachiningandmillingfixturedesign摘要轴类零件是机器中经常遇到的典型零件之一。它主要用来支承传动零部件，传递扭矩和承受载荷。轴类零件是旋转体零件，其长度大于直径，一般由同心轴的外圆柱面、圆锥面、内孔和螺纹及相应的端面所组成。根据结构形状的不同，轴类零件可分为光轴、阶梯轴、空心轴和曲轴等。轴的长径比小于5mm的称为短轴，大于20mm的称为细长轴，大多数轴介于两者之间。轴用轴承支承，与轴承配合的轴段称为轴颈。轴颈是轴的装配基准，它们的精度和表面质量一般要求较高，其技术要求一般根据轴的主要功用和工作条件制定，通常有以下几项：轴类零件中工艺规程的制订，直接关系到工件质量、劳动生产率和经济效益。一零件可以有几种不同的加工方法，但只有某一种较合理，在制订机械加工工艺规程中，须注意以下几点。1.零件图工艺分析中，需理解零件结构特点、精度、材质、热处理等技术要求，且要研究产品装配图，部件装配图及验收标准。2.粗基准选择：有非加工表面，应选非加工表面作为粗基准。对所有表面都需加工的铸件轴，根据加工余量最小表面找正。且选择平整光滑表面，让开浇口处。选牢固可靠表面为粗基准，同时，粗基准不可重复使用。3.精基准选择：要符合基准重合原则，尽可能选设计基准或装配基准作为定位基准。符合基准统一原则。尽可能在多数工序中用同一个定位基准。尽可能使定位基准与测量基准重合。选择精度高、安装稳定可靠表面为精基准。关键词：？？轴类零件、机械加工工艺分析、铣工夹具ABSTRACTTheaxisclasscomponentsareonewhichoftypicalcomponentsinthemachinemeetsfrequently.Itmainlyusesforthesupportingtransmissionsparepart,thetransmissiontorqueandtheabsorbingload.Theaxisclasscomponentsarethesolidofrevolutioncomponents,itslengthisbiggerthanthediameter,generallybywithspindle'souterannuluscylinder,thecircularconicalsurface,intheholeandthethreadandthecorrespondingendsurfaceiscomposed.Accordingtothestructureshape'sdifference,theaxisclasscomponentsmaydivideintotheopticalaxis,thestepsandladdersaxis,thecanonandthecrankandsoon.theaxis'slengthtodiameterratioissmallerthan5mmiscalledtheminoraxis,isbiggerthan20mmiscalledthethinmajoraxis,mostlythenumberaxisissituatedbetweenboth.theaxiswiththebearingsupporting,iscalledthejournalwiththebearingcoordination'saxissection.Thejournalistheaxisassemblydatum,theirprecisionandthesurfacequalitygeneralrequestarehigh,itsspecificationactsaccordingtotheaxisgenerallythemainfunctionandtheworkingconditionformulation,usuallyhasthefollowingseveralitems:(1)SizeprecisionPlaysthesupportingrolethejournalforthetruedeadaxle'sposition,usuallyishightoitssizeaccuracyrequirement(IT5~IT7).Theassemblypassesonthemovingpartsthejournalsizeprecisiongeneralrequesttobelow(IT6~IT9).(2)GeometricalshapeprecisionTheaxisclasscomponents'geometricalshapeprecisionismainlyreferstothejournal,themalecone,theMorseawlholeandsoonroundness,thecylindricityandsoon,generallyshouldlimititscommondifferenceinthesizetoleranceinterval.Totheaccuracyrequirementhighinouterannulussurface,shouldlabelitsallowabledeviationontheblueprint.(3)MutualpositionprecisionTheaxisclasscomponents'positionaccuracyrequirementismainlydecidesbytheaxisinmachinerypositionandthefunction.Usuallyshouldguaranteethattheassemblypassesonthemovingpartsthejournaltosupportingjournal'sproperalignmentrequest,willotherwiseaffectwillpassonthemovingparts(gearandsoon)thetransmissionprecision,andwillhavethenoise.Generalprecision'saxis,itscoordinateaxissectiontosupportingjournal'sradialdirectionbeatisgenerally0.01~0.03mm,thehighaccuracyaxis(fo...
