外文翻译--镗杆伺服系统上线校正的加工误差 英文版.pdf外文翻译--镗杆伺服系统上线校正的加工误差 英文版.pdf

收藏 分享

资源预览需要最新版本的Flash Player支持。
您尚未安装或版本过低,建议您

ANOVERHUNGBORINGBARSERVOSYSTEMFORONLINECORRECTIONOFMACHININGERRORSWMCHIUA,,FWLAMA,DGAOBADEPARTMENTOFMANUFACTURINGENGINEERING,THEHONGKONGPOLYTECHNICUNIVERSITY,HUNGHOM,KOWLOON,HONGKONGBDEPARTMENTOFMECHANICALENGINEERING,HARBININSTITUTEOFTECHNOLOGY,HARBIN,PRCHINARECEIVED17JUNE2001ABSTRACTINTHISPAPER,ANEWLYDESIGNEDOVERHUNGBORINGBARSERVOSYSTEMEQUIPPEDWITHANONLINECOMPENSATIONFUNCTIONFORMACHININGERRORSISPRESENTEDTHEOVERHUNGBORINGBARTHATHASBEENDEVELOPEDISMADEWITHAPAIROFCONCENTRICBARSWITHANOUTERDIAMETEROF14MMANDANOVERHUNGRATIOOF81APIEZOELECTRICPZTACTUATORWASINCORPORATEDINTHEBORINGBARSERVOSYSTEMTOACHIEVEONLINECOMPENSATIONACONTROLTECHNIQUE,‘‘FORECASTINGCOMPENSATORYCONTROL’’FCCWASIMPLEMENTEDINTHEBORINGBARSERVOSYSTEMTOPERFORMANONLINEPREDICTIONOFTHEMACHININGERRORSENCOUNTEREDANOFFLINESIMULATIONWASPERFORMEDTOTESTTHEADEQUACYOFTHEPARAMETERSBEINGUSEDINTHEFCCMODELSADOPTEDRESULTSOFTHECUTTINGTESTSWITHTHEBORINGBARSERVOSYSTEMSHOWTHATTOTHEEXTENTLIMITEDBYTHEINSTRUMENTCAPABILITY,ABORINGBARSERVOSYSTEMUSINGANFCCMETHODOLOGYCANBEAVERYCOSTEFFECTIVETOOLFORONLINECOMPENSATIONOFMACHININGERRORSINTHEPRECISIONBORINGOFHOLESWITHHIGHASPECTRATIOSKEYWORDSREALTIMEERRORCOMPENSATION;PRECISIONBORING;FORECASTINGCOMPENSATORYCONTROL1INTRODUCTIONTHEGENERALLEVELOFWORKACCURACYANDSURFACEFINISHREQUIREDOFMACHINEDPARTSISBECOMINGINCREASINGLYMORESTRINGENTINMODERNINDUSTRYTHEREARETWOGENERALAPPROACHES,COMMONLYKNOWNAS‘‘ERRORAVOIDANCE’’AND‘‘ERRORCOMPENSATION’’METHODS,AVAILABLEFORREDUCINGTHEERRORSTHATADVERSELYAFFECTTHEFORMACCURACYOFAMACHINEDPARTUNDOUBTEDLY,THEREALTIMEERRORCOMPENSATIONMETHODISPROBABLYTHEMOSTDIRECTANDCOSTEFFECTIVEWAYTODEALWITHEXTERNALDISTURBANCESOFUNPREDICTABLENATURESUCHASNONUNIFORMDEPTHSOFCUT,SPINDLEMOTIONERRORS,DYNAMICVIBRATIONS,ETCOVERTHEYEARS,REALTIMEERRORCOMPENSATIONMETHODOLOGYHASFOUNDMANYFRUITFULAPPLICATIONSININDUSTRYDUETOITSREADINESSTOHANDLESITUATIONSINVOLVINGDISTURBANCESOFDYNAMICANDNONREPETITIVENATUREALTHOUGHACONSIDERABLEVOLUMEOFRESEARCHWORKHASBEENREPORTEDINTHEAREAOFONLINEACTIVEERRORCOMPENSATIONFORMACHININGOPERATIONSINTHELASTTWODECADES1–3,THEREWEREONLYAFEWATTEMPTSTHATWEREFOCUSEDONTHEOVERHUNGBORINGOFDEEPHOLESBEINGTHEWEAKESTLINKINTHEFORCELOOPWITHINTHEMACHINE–TOOLSTRUCTURE,ABORINGBARPLAYSADOMINANTROLEINDETERMININGTHEOVERALLFORMACCURACYANDCUTTINGPRODUCTIVITYWITHINTHEWHOLEMACHINE–TOOLSYSTEMUNLIKEOTHERREMOVALPROCESSES,THEIMPLEMENTATIONOFACTIVEERRORCOMPENSATIONFOROVERHUNGBORINGPOSESSOMEREALCHALLENGESINMODERNDAYMACHINECONTROLTECHNOLOGYBECAUSESMALLSENSORSTHATCANBEATTACHEDTOSMALLSIZEDBORINGBARSFORMONITORINGFORMERRORSINSMALLHOLESAREEXTREMELYRAREANOTHERMAJORDIFFICULTYCOMESFROMTHEINACCESSIBILITYOFTHECUTTINGPOINTTHATPREVENTSSENSORSFROMBEINGMOUNTEDCLOSETOTHEPOINTOFCUTTINGFORREALTIMEMEASUREMENTFURTHER,ACTUATORSTHATAREUSEABLETOEFFECTTHENECESSARYCOMPENSATORYACTIONAREMOSTLYTOOLARGETOFITINSIDESMALLOVERHUNGBORINGBARSHENCE,CONVENTIONALSENSORSANDACTIVEACTUATORS,WHICHARESUCCESSFULFORREALTIMEMEASUREMENTANDCOMPENSATIONINMUCHEXTERNALMACHINING,AREOFLITTLEUSEWHENINTERNALSURFACESAREENCOUNTEREDSEVERALBORINGBARDESIGNSFORONLINEACTIVEERRORCOMPENSATIONHAVEBEENREPORTED4–6INTHESESYSTEMSREPORTED,THEACTUATORSFORCOMPENSATIONAREINSTALLEDINSIDETHEBORINGBARANDCLOSETOTHECUTTINGTOOLALTHOUGHTHEMACHININGERRORSCANBECONTROLLEDBYSENSORSANDACTUATORSINCLOSEPROXIMITYTOTHECUTTINGZONE,THEBORINGBARSDESIGNEDINSUCHAWAYARELARGEINDIMENSIONSSOASTOACCOMMODATETHESEFITTEDDEVICES,HENCERENDERINGTHEMSELVESUNSUITABLEFORUSEINSMALLERHOLESJOURNALOFMATERIALSPROCESSINGTECHNOLOGY1222002286–292CORRESPONDINGAUTHORTEL85227666590;FAX85223625267EMAILADDRESSMFWMCHIUINETPOLYUEDUHKWMCHIUINTHISPAPER,ABORINGBARSERVOSYSTEMOF14MMDIAMETERAND81OVERHUNGRATIOWHICHINCORPORATESAPIEZOELECTRICPZTACTUATORFORONLINEERRORCORRECTIONISPRESENTEDTHEBORINGBARCONSISTSOFTWOCONCENTRICBARS,ONEOFWHICHISUSEDFORERRORDETECTIONANDTHEOTHERFORERRORCOMPENSATIONANANALYTICALANDEXPERIMENTALSTUDYHASBEENCONDUCTEDTOSHOWHOWTHISBORINGBARSERVOSYSTEMCANBEUSEDTOCOMPENSATEFORTHEINSTANTANEOUSMACHININGERRORSDURINGTHEBORINGPROCESS2BORINGBARSERVOSYSTEM21OPERATINGPRINCIPLEASCHEMATICDIAGRAMOFTHEBORINGSERVOSYSTEMISSHOWNINFIG1THEDUALCONCENTRICBORINGBARADOPTSALEVERSTRUCTUREWITHAPZTACTUATORANDABORINGCUTTERINSTALLEDATTHEOPPOSITEENDSOFTHEBARBYAPPLYINGASUITABLEVOLTAGETOTHEPZTAMPLIFIER,THEACTUATORSTACKWILLCONTRACTTHECONTRACTIONOFTHEACTUATORSTACKCANBETRANSFERREDINTOAMICROFEEDINGMOTIONOFTHEBORINGCUTTERBYROTATINGTHECONTROLOUTERBARAROUNDTHEFLEXURALPIVOTTHEMEASURINGINNERBARISOFACANTILEVERSTRUCTUREWITHSTRAINGAGESATTACHEDFORMEASURINGTHEFORCEINDUCEDDEFLECTIONSINTHEBARTHEAMOUNTOFMICROFEEDINGOFTHEBORINGCUTTERISCALCULATEDACCORDINGTOTHEMEASUREDSTRAINSIGNALSINTHEMEASURINGBARASARESULT,THEBORINGBARSODESIGNEDCANBEMADEWITHAMUCHSMALLEROUTERDIAMETEREVENTHOUGHTHEPZTACTUATORANDSTRAINGAGESHAVEBEENINCORPORATEDTHESEQUENCEOFSTEPSINOPERATINGTHEBORINGBARSERVOSYSTEMISOUTLINEDASFOLLOWS1THEINSTANTANEOUSDEFLECTIONOFTHEBORINGTOOLACTEDBYTHECUTTINGFORCEISMEASUREDBYTHESTRAINGAGESATTACHEDTOTHEMEASURINGBAR2THEVOLTAGESIGNALFROMTHESTRAINGAGESISDIGITIZEDBYANA/DCONVERTERFORDATALOGGING3THESAMPLEDERRORDATAISPROCESSEDINTHECONTROLCOMPUTER4ANOUTPUTCONTROLCOMMANDISTRANSFORMEDBYAD/ACONVERTERINTOANANALOGSIGNALWHICHISUSEDTODRIVETHEPIEZOACTUATORTHROUGHITSPOWERAMPLIFIER5THEDEFLECTIONOFTHEBORINGTOOLISSUPPRESSEDTHROUGHTHECORRECTIVEACTIONOFTHEPZTACTUATOR,HENCEMAINTAININGACONSTANTNOMINALCUTTERPOSITIONANDNEUTRALIZINGTHEDETRIMENTALEFFECTSOFCUTTINGFORCESONTHEFORMACCURACYASSHOWNINFIG2,BEFORETHECUTTINGFORCEFCISAPPLIEDIEFC0,BOTHTHECONTROLANDMEASURINGBARSREMAINSTRAIGHTFIG2AASTHECUTTINGFORCEFCACTSONTHEBORINGBAR,THEBORINGBARASAWHOLEISDEFLECTEDDOWNWARDSFIG2BRESULTINGINANINCREASEOFSTRAININTHEMEASURINGBARANDGENERATINGAPROPORTIONALANALOGSIGNALFROMTHESTRAINGAGESTHISANALOGSIGNALISSAMPLEDBYTHECONTROLCOMPUTERTHROUGHTHEA/DCONVERTERANDUSEDTOGENERATEACONTROLLINGACTIONTHEPZTACTUATORTHENEXPANDSBYINCREASINGTHEAPPLIEDVOLTAGETOTHEPOWERAMPLIFIERTHROUGHTHED/AINTERFACEASARESULT,THECONTROLBARROTATESAROUNDTHEFLEXURALHINGEINACLOCKWISEDIRECTIONSUPPRESSINGTHEDOWNWARDDEFLECTIONOFTHECUTTERUNTILTHEMEASURINGBARBECOMESSTRAIGHTAGAINASCANBESEENINFIG2C,THERESTORATIONOFTHECUTTERTOITSEQUILIBRIUMPOSITIONISACHIEVEDWITHGREATERDEFORMATIONINTHECONTROLBARONTHEOTHERHAND,IFTHEEXTERNALFORCEISMOMENTARILYREDUCED,THEDEFLECTIONOFTHEBORINGBARBECOMESLESSASTHEFORCEWITHINTHESYSTEMISLOWERANOPPOSITECONTROLACTIONWILLBEISSUEDTOTHEPZTACTUATORINORDERTOOFFSETTHECHANGEINTHISWAY,NOMATTERHOWTHECUTTINGFORCEVARIESINTHECOURSEOFCUTTING,THEBORINGTOOLWILLTENDTORETURNTOTHEPRESETPOSITION,THUSFORCINGTHEBORINGTOOLTOUNDERGOCUTTINGATEFFECTIVELYZERODEFLECTIONTHEREFORE,THEFORCEINDUCEDEFFECTSONTHEMACHINEDSURFACEWOULDTHENBECANCELLEDOUTANDTHEOVERALLFORMACCURACYSHOULDBEIMPROVED22MODELINGOFTHEBORINGBARSERVOSYSTEMFORTHEANALYSISOFTHEDYNAMICBEHAVIOROFTHEBORINGBARSERVOSYSTEM,THEEQUATIONOFMOTIONISFORMULATEDASSHOWNINFIG3FORTHISPURPOSE,ELEMENTSOFTHEBORINGBARSERVOSYSTEMAREMODELEDBYASINGLEDEGREEOFFREEDOMSYSTEMFIG1ASCHEMATICDIAGRAMOFTHEBORINGBARSERVOSYSTEMFIG2THEINTERACTIONOFDEFLECTIONANDCORRECTIONINACOMPENSATIONCYCLEWMCHIUETAL/JOURNALOFMATERIALSPROCESSINGTECHNOLOGY1222002286–292287WITHLUMPEDMASSES,STIFFNESSANDVISCOUSDAMPINGCOEFFICIENTSVARIABLEYSTANDSFORTHERADIALDEFLECTIONOFTHECUTTER;YFORTHEANGULARROTATIONABOUTPOINTOOFTHECONTROLBAR;JFORTHEANGULARROTATIONABOUTBASEPOINTO0OFTHEMEASURINGBAR;IYSTANDSFORTHEMOMENTOFINERTIAOFTHECONTROLBARABOUTPOINTO;IJFORTHATOFTHEMEASURINGBARABOUTPOINTO0;CY,KYARETHEDAMPINGCOEFFICIENTANDSTIFFNESS,RESPECTIVELY,OFTHECONTROLBAR;CJ,KJARETHEDAMPINGCOEFFICIENTANDSTIFFNESS,RESPECTIVELY,FORTHEMEASURINGBAR;FCANDFPREPRESENTSTHERADIALCUTTINGFORCEANDTHECOMPRESSIVEFORCE,RESPECTIVELY,OFTHEPZTACTUATORFORSMALLDEPARTURESFROMEQUILIBRIUM,ANGLESJANDYCANBEASSUMEDTOBESMALLSOTHATTHEEQUATIONOFMOTIONCANBESIMPLIFIEDTOMC127YC_YKYFCL1L2FP1WHEREMIYIJL21MPL22;CCYCJL21CPL22;KKYKJL21KPL22TWOEQUATIONSGOVERNINGTHEDESIGNOFTHEBORINGBARSYSTEMCANBEOBTAINEDFROMEQ1INEQ2,THEMAXIMUMUNCONSTRAINEDRADIALTOOLTRAVEL,YMAX,ISEXPRESSEDINTERMSOFDMAX,THEMAXIMUMUNCONSTRAINEDEXPANSIONFORTHEPZTACTUATORSIMILARLY,THEUNDAMPEDNATURALFREQUENCYOFTHEBORINGSYSTEM,ON,ISSHOWNINEQ3YMAXL1L2KPKYKJL21KPDMAX2ONffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiKYKJL21KPIYIJL21MPS323FORECASTINGCOMPENSATORYCONTROLFCCMODELTOCARRYOUTONLINECONTROL,ITISIMPORTANTTOSELECTASUITABLECONTROLSCHEMETHATISCOMPUTATIONALLYSIMPLE,YETSOPHISTICATEDENOUGHTOTRACKANYRAPIDLYCHANGINGCOMPONENTSOFTHECONTROLLEDVARIABLEATIMESERIESAPPROACHBASEDONFCCMETHODOLOGYWHICHHASBEENSUCCESSFULLYIMPLEMENTEDINMANYMACHINECONTROLPROBLEMS7HASBEENADOPTEDINTHISWORKTHESTREAMOFTOOLDEFLECTIONSFROMTHEBORINGBARSERVOSYSTEMOCCURRINGWITHINAGIVENSEQUENCEOFTIMEMAYBETREATEDASATIMESERIESTHATCANBEMODELEDBYANAUTOREGRESSIVEANDMOVINGAVERAGEARMASERIESTHEADVANTAGEOFTHETIMESERIESAPPROACHISITSVERSATILITYINPREDICTINGFUTUREVALUESOFTHEOUTPUTVARIABLEWITHOUTGOINGTHROUGHTHEPROCESSOFESTABLISHINGTHECAUSEANDEFFECTRELATIONSHIPSAMONGVARIOUSINPUTPARAMETERSANDTHEIROUTPUTSMOREIMPORTANTLY,ITISPOSSIBLETOACCOUNTFORTHERANDOMPARTOFTHECONTROLLEDVARIABLESASWELLASTHEIRDETERMINISTICPARTDUETOTHEMERITSOFBEINGLESSDEMANDINGINTERMSOFTHECOMPUTINGPOWERREQUIREDFORIMPLEMENTATION,ANAUTOREGRESSIVEARMODEL,ASIMPLIFIEDVERSIONOFANARMAMODEL,HASBEENSELECTEDTOMODELTHEDEFLECTIONERRORSYTF1YTC01F2YTC02C1C1C1FPYTC0PD4WHEREYTSTANDSFORTHETOOLDEFLECTIONERROROBSERVEDATDIFFERENTTIMEINSTANCEST,FJTHEARPARAMETERSANDDASERIESOFWHITENOISEREPRESENTINGTHERANDOMDISTURBANCESTHEPARAMETERSOFTHEARMODELOFORDER‘P’CANBEDETERMINEDRECURSIVELYONLINEATEACHSAMPLINGTIME,THEPARAMETERSOFTHEARMODELWILLBEUPDATEDASTHELATESTYTBECOMESAVAILABLETHISWILLALLOWTHEARMODELTOADAPTITSELFINTRACKINGTHEPROCESSVARIABILITYONEOFTHEMOSTIMPORTANTFEATURESOFTHEFCCTECHNIQUELIESINITSFORECASTINGCAPABILITYBASEDONTHEPASTANDCURRENTMEASUREMENTS,THECONTROLLEDVARIABLEFORTHENEXTSAMPLINGINTERVALCANBEPREDICTEDBYUSINGTHECONSTRUCTEDARMODELANDCOMPENSATEDBEFORETHECUTTERACTUALLYCUTSTHEWORKTHISFORECASTINGCAPABILITYTENDSTOOVERCOMETHETIMELAGPROBLEMBETWEENTHEMOMENTOFERRORMEASUREMENTANDTHATOFTAKINGCORRECTIVEACTIONITALLOWSEXTRATIMEFORACONTROLLERTOGENERATEACONTROLCOMMANDANDTHEEFFECTERTORESPONDTOTHATCOMMANDFROMEQ4,A‘QSTEPAHEAD’FORECASTINGMODELINYTQISEXPRESSEDASYTQXQC01I1FIYTQC0IXPIQFIYTQC0I5T
编号:201311171919357904    类型:共享资源    大小:220.26KB    格式:PDF    上传时间:2013-11-17
  
10
关 键 词:
教育专区 外文翻译 精品文档 外文翻译
  人人文库网所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
关于本文
本文标题:外文翻译--镗杆伺服系统上线校正的加工误差 英文版.pdf
链接地址:http://www.renrendoc.com/p-97904.html

当前资源信息

4.0
 
(2人评价)
浏览:37次
英文资料库上传于2013-11-17

官方联系方式

客服手机:17625900360   
2:不支持迅雷下载,请使用浏览器下载   
3:不支持QQ浏览器下载,请用其他浏览器   
4:下载后的文档和图纸-无水印   
5:文档经过压缩,下载后原文更清晰   

相关资源

  • 专题外文资料翻译
  • 专题毕业课程设计论文顺通助学中心
  • Thomas_Calculus_13th(托马斯微积分 13版)Thomas_Calculus_13th(托马斯微积分 13版)
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊2016】借助于电缆驱动系统改进工业机器人的静态性-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊2016】借助于电缆驱动系统改进工业机器人的静态性-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊2016】借助于电缆驱动系统改进工业机器人的静态性-外文文献[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊2016】借助于电缆驱动系统改进工业机器人的静态性-外文文献
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】最小化模式下料问题科林麦克迪尔米德-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】最小化模式下料问题科林麦克迪尔米德-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】组合机床行业现状与发展思考-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】组合机床行业现状与发展思考-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】自行航水器真正自治-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】自行航水器真正自治-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】自行航水器真正自治-外文文献[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】自行航水器真正自治-外文文献
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】注塑模具的设计与热分析-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】注塑模具的设计与热分析-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】注塑模的单浇口优化-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】注塑模的单浇口优化-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】注塑模的单浇口优化-外文文献[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】注塑模的单浇口优化-外文文献
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】主轴平衡力和曲轴弯曲应力的研究-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】主轴平衡力和曲轴弯曲应力的研究-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】轴对称降落伞形状的研究-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】轴对称降落伞形状的研究-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】轴对称降落伞形状的研究-外文文献[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】轴对称降落伞形状的研究-外文文献
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】中国乘用车燃料经济性标准的组成和影响-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】中国乘用车燃料经济性标准的组成和影响-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】指垫和平面之间的动态交互作用:实验和分析-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】指垫和平面之间的动态交互作用:实验和分析-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】指垫和平面之间的动态交互作用:实验和分析-外文文献[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】指垫和平面之间的动态交互作用:实验和分析-外文文献
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】直线电机高速数控切断机的发展-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】直线电机高速数控切断机的发展-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】直线电机高速数控切断机的发展-外文文献[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】直线电机高速数控切断机的发展-外文文献
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】支持机床系统的面向对象设计-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】支持机床系统的面向对象设计-中文翻译
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】支持机床系统的面向对象设计-外文文献[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】支持机床系统的面向对象设计-外文文献
  • [机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】振动镗孔与振动钻孔的研究-中文翻译[机械模具数控自动化专业毕业设计外文文献及翻译]【期刊】振动镗孔与振动钻孔的研究-中文翻译
  • 精品推荐

    相关阅读

    人人文库
    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服客服 - 联系我们

    网站客服QQ:2846424093    人人文库上传用户QQ群:460291265   

    [email protected] 2016-2018  renrendoc.com 网站版权所有   南天在线技术支持

    经营许可证编号:苏ICP备12009002号-5