机械毕业设计英文外文翻译175公差与表面粗糙度.docx
- 文档编号:5661005
- 上传时间:2022-12-30
- 格式:DOCX
- 页数:6
- 大小:21.59KB
机械毕业设计英文外文翻译175公差与表面粗糙度.docx
《机械毕业设计英文外文翻译175公差与表面粗糙度.docx》由会员分享,可在线阅读,更多相关《机械毕业设计英文外文翻译175公差与表面粗糙度.docx(6页珍藏版)》请在冰豆网上搜索。
机械毕业设计英文外文翻译175公差与表面粗糙度
Commondifferenceandsurfaceroughness
Themoderntechnologyismoreandmorestricttothecomponentssizeprecisionrequest.Moreover,atpresentmanycomponentshavespreadineachplacedifferentfactoryproduction,thereforemustmakesthestrictstipulationtothesecomponentssizesandtheproduction,guaranteedtheyhavetheinterchangeability.
Causesitforthecomponentssignnotesizetochangeinastipulationsector,guaranteedtheyhavetheinterchangeabletechnologytobecalledthecommondifferencetechnology.Allowseachsizecertainlytohaveinthestipulationscopechangesthemomentum,iscalledthecommondifference.Forexample,acomponentssizemayexpressfor20±0.5,itscommondifference(sizechangesmomentum)is1.00mm.
Indoesnotaffectthecomponentsperformanceinthesituation,mustgivethesizeasfaraspossiblebigcommondifference,byfallstheproductioncosttoislowest.Theproductioncostreducesalongwiththecommondifferenceelevates.
Somethreeexpressionssizecommondifferenceway:
Unidirectional,bidirectionalandlimitway.Whenusesthepositiveandnegativecommondifference,addstothecommondifferenceisbeencalledthebasicsizethetheorysizetocomeup.Whenonlyallowsthesizetohave(orchangesinabigwaytothebasicsizesoledirection,orchangesslightly)whenchange,istheunilateraltolerance.May(changeinthesizewhenthebasicsizetwodirectionsbigorchangesslightly)allmaychange,thecommondifferenceisbidirectional.Thecommondifferencealsomayusethelimitformtoproduce,theexpressioncomponentscontourisbiggestandmostlight-sized.
Someandcommondifferencerelatedterminologyanddefinitionasfollows:
Commondifference:
Upperlimitandlowerlimitbadvaluestipulatedwhichforsomesize.Basicsize:
Thetheorysize,iscalculatestheextremedimensionandthedeviationoutsetsize.DeviationTheholesizeortheaxissizesubtractsthebasicsizeobtainedbadvalue.Thecomponentsbiggestextremedimensionsubtractsitsbasicsizeobtainedbadvalue.Thecomponentssmallestextremedimensionsubtractsitsbasicsizeobtainedbadvalue.Actualsize:
Afterprocessingcomponentsactualsize.Coordination:
Twoassembleinbetweentogethercomponentsdegree.Maydivideintothecoordinationthreekinds:
Gapcoordination,excessivelyfullcoordination,transitionfit.Gapcoordination:
Twoassembleinbetweenthetogetherfittinghasthegapthecoordination.
Excessivelyfullcoordination:
Twoassembleinbetweenthetogethercomponentshasthefullcoordinate-axistobebiggerthanthehole,needstomakeaneffortthecoordinationwhichorthepressurecarrieson,hasissimilartotwocomponentsweldsintogethereffect.Transitionfit:
Intwoassemblesinbetweenthetogethercomponentsorexistsexcessivelyfull,orhasthegapthecoordinate-axistobeallowedtobesmallerthanortobebiggerthanthehole,butstillinstipulationcommondifference.Selectiveassembly:
Throughmanuallytriestomatchchoosesandtheunitmethod.Throughthismethod,mayassemblecommondifferencebiggercomponentswhichmakesunderalowercost.Itmaytakethehighmanufactureprecisionandiseasybetweenthecomponentsonecompromisemethodwhichassembles.Usesthesmallestholesizetotakethecomputationcommondifferenceandtheprocessingremainderbasicsize.Whenusesthestandardthedrillbit,theenginebedcarriesontheprecisionprocessingtothehole,thesystemisextremelyeffective.Usesthesmallestholethesizetotakethebasicsizeisbecausetheholesizemaychangeinabigwaythroughthemachine-finishing,butcannotreduce.
Maydefertowhentheunusualhighaccuracythestandardsizeprovides,usesthebasicshaftsystemissuitable.Whencomputationcommondifferenceandremainder,usestheaxismostlargediametertotakethebasicsize.Thisisbecausetheaxismayturnasmallersizethroughtheprocessing,butthebasicsizecannotincrease.Internationalcommondifference(IT)rank:
Aseriesofalongwithbasicsizechange,alsoprovidestheevenprecisioninthestipulationrankthecommondifference.Altogetherhas18ITrank:
IT01,IT0,IT1...IT16.Commondifferencemark:
Themarkhasproducedthecommondifferenceandthecoordinatespecification,thebasicsizeisanumeral,behindandexpressestheITranknumeralwiththeexpressionbasicdeviationletter.Theydecidethetolerancezonetogetherthesizeandtheposition.Thecapitalletterrepresentstheholethebasicdeviation,thelowercaseletterrepresentstheaxisthebasicdeviation.Becausethesuperficialappearance(namelyfineness)canaffectthecomponentstheperformance,thereforemustpreciselyperformtoitssizetostipulate,thesuperficialappearanceisonthesuperficialdifference,includingroughness,waviness,processingtexturedirectionandflaw.Roughness:
Usefulcausesslightestwhichtheworkpiecesurfacebrightandcleanprocessingcraftcreatessurfaceirregularity.Thesurfaceroughnesshighlyusesmicronandthemicroinchcarriesonthesurvey.Waviness:
Issurpassesroughnesswidththeboundarybiggapdeviation,usesinchandamillimetersurvey.Mayregardasroughnesstosuperimposeonwavinesssurfacesurfaceirregularity.Processingtexturedirection:
Thesuperficialdesigndirectionwhichbywhichusestheprocessingmethodproduces.Flaw:
Notfrequentlyappearsorthesurfacedefectwhichcanappearintheverybigsectortalent,itincludingthecrack,theblowhole,thetinycrack,delimitsthemarkandsoon.Theflawinfluenceusuallyisneglectedinroughnesslevelling.
Theprojectpatternismakesthemachinepartthebasis.Therefore,isengagedinthemanufacturingindustrythestaffallwantthecorrectunderstandingtoapplytotheentireproductionprocesspatternmeaning.Mustfacethiskindoffactinenterpriseworkengineer,namelyanytwomachinepartallcannotmakethequitesamenotlessthan.Heknewinthedesignmustconsidertherepetitionlivesthesmallsizedifferencewhichmid-productionproduces,inthepatternsuperscriptnoteappropriatecommondifference,limitsthesizechangeinthepermissionscope.Aftertheprocessingcomponentsoutlinemustbelocatedthecommondifferencestipulationintheregion.Usesthesuitablecommondifferencetobeallowedtoguaranteetheproductthefunctionandtheservicelifeaspectallcanachievetheanticipatedgoal.
Eachdesignpersonnelextremelyareallclear,ifthecomponentsallprocessthemanufacturebyasmallercommondifference,thentheproductcostcanrapidlyincrease.Therefore,engineersunceasinglyobtaintheadvice,mustuseasfaraspossiblethebigcommondifference.However,sometimespossiblyappearsbetweeneachkindofcommondifferencereciprocitywhichneedstothefunctionrequestnottoconductthefullresearchthesituation.Inthiskindofsituation,inordertoguaranteecomponentswhenassemblydoesnotgiverisetoaquestionorproblem,notnotappropriatelydesignsthepersonnelusuallytostipulatethecommondifferencetoostrictly.Isoppositeearnestlyto,isthoroughcarriesontothecommondifferenceanalyzessaidthat,thisobviouslyisapriceexpensivesubstitutionway.Iftheproductisproducedbyalowerpriceandthesatisfiedmurderousintentionrequest,stipulatedthesuitableprocessingcommondifferenceisthemostimportantwork.Thecommondifferencesizeisbydesigns,itwhichthepersonneldeterminedisdecidedbymanywiththedesignrelatedconditionaswellasinthepastwhenthedesignsimilarproductobtainsexperience(ifhasthisaspectexperience).Ifstipulatedthecommondifferencetooissmall,whenusespresenttheprocessingequipmentprocessingworkpiececannotachievethedesignrequest,needstodesigncarriesonthechange.Intheprojectpatterntheplacecancausemanyischaoticandtheeconomicloss.Whendraftsthecommondifference,designsthepersonneltohavefullytorealize,mustcompletelyachieveitsdesigngoal,inthepatternmustcontaintheinformationwhichneeds.Thus,inthepatternmustproducethecompleteinformation,andasfaraspossiblesimplewasbright.Inpatterneachpartallshouldbeabletounderstandbyeverybody.Inthepatternexpressedthemeaningregardingallusesitthepersonnel(design,purchase,cuttingtooldesign,production,examination,assemblyandservicedepartment)saidallshouldbeonly.Thecommondifferencemayselectthedifferentsignnotemethodinthepattern.Intheunidirectionalsystem,alimitdeviationiszero,anotherlimitdeviationisthesizepermissioncompletelychangesthemomentum.Inthebidirectionalsysteminthesizesignnote,usestheintermediatesizeandchangesthemomentuminitspositiveandnegativetwodirectionstoexpress.Whenwhenallsizesalloccupythematerialwhichthepermissioncomponentsincludesformostlimitingcondition,calledthiscomponentsareatthebiggestentitycondition(MMC).Regardinganaxisorexternaldimensions,itsbasicsizeforthebiggestextremedimension,itchangeswhenthetolerancezone,onlycancauseminification.Regardingaholeortheinternalsize,itsbasicsizeforthesmallestextremedimension,inthetolerancezonechange,onlycancausethesizetoincrease.
Eachdesignpersonnelextremelyareallclear,ifthecomponentsallprocessthemanufacturebyasmallercommondifference,thentheproductcostcanrapidlyincrease.Therefore,engineersunceasinglyobtaintheadvice,mustuseasfaraspossiblethebigcommondifference.However,sometimespossiblyappearsbetweeneachkindofcommondifferencereciprocitywhichneedstothefunctionrequestnottoconductthefullresearchthesituation.Inthiskindofsituation,inordertoguaranteecomponentswhenassemblydoesnotgiverisetoaquestionorproblem,notnotappropriatelydesignsthepersonnelusuallytostipulatethecommond
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 机械 毕业设计 英文 外文 翻译 175 公差 表面 粗糙