会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > PDF文档下载

外文翻译--对于注塑模具钢研磨和抛光工序的自动化表面处理 英文版.pdf

  • 资源星级:
  • 资源大小:458.73KB   全文页数:6页
  • 资源格式: PDF        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--对于注塑模具钢研磨和抛光工序的自动化表面处理 英文版.pdf

DOI10.1007/s0017000423288ORIGINALARTICLEIntJAdvManufTechnol20062861–66FangJungShiouChaoChangA.ChenWenTuLiAutomatedsurfacefinishingofplasticinjectionmoldsteelwithsphericalgrindingandballburnishingprocessesReceived30March2004/Accepted5July2004/Publishedonline30March2005©SpringerVerlagLondonLimited2005AbstractThisstudyinvestigatesthepossibilitiesofautomatedsphericalgrindingandballburnishingsurfacefinishingprocessesinafreeformsurfaceplasticinjectionmoldsteelPDS5onaCNCmachiningcenter.Thedesignandmanufactureofagrindingtoolholderhasbeenaccomplishedinthisstudy.TheoptimalsurfacegrindingparametersweredeterminedusingTaguchisorthogonalarraymethodforplasticinjectionmoldingsteelPDS5onamachiningcenter.TheoptimalsurfacegrindingparametersfortheplasticinjectionmoldsteelPDS5werethecombinationofanabrasivematerialofPAAl2O3,agrindingspeedof18000rpm,agrindingdepthof20µm,andafeedof50mm/min.ThesurfaceroughnessRaofthespecimencanbeimprovedfromabout1.60µmto0.35µmbyusingtheoptimalparametersforsurfacegrinding.SurfaceroughnessRacanbefurtherimprovedfromabout0.343µmto0.06µmbyusingtheballburnishingprocesswiththeoptimalburnishingparameters.Applyingtheoptimalsurfacegrindingandburnishingparameterssequentiallytoafinemilledfreeformsurfacemoldinsert,thesurfaceroughnessRaoffreeformsurfaceregiononthetestedpartcanbeimprovedfromabout2.15µmto0.07µm.KeywordsAutomatedsurfacefinishingBallburnishingprocessGrindingprocessSurfaceroughnessTaguchismethod1IntroductionPlasticsareimportantengineeringmaterialsduetotheirspecificcharacteristics,suchascorrosionresistance,resistancetochemicals,lowdensity,andeaseofmanufacture,andhaveincreasinglyF.J.Shioua117C.C.A.ChenW.T.LiDepartmentofMechanicalEngineering,NationalTaiwanUniversityofScienceandTechnology,No.43,Section4,KeelungRoad,106Taipei,TaiwanR.O.C.Emailshioumail.ntust.edu.twTel.886227376543Fax886227376460replacedmetalliccomponentsinindustrialapplications.Injectionmoldingisoneoftheimportantformingprocessesforplasticproducts.Thesurfacefinishqualityoftheplasticinjectionmoldisanessentialrequirementduetoitsdirecteffectsontheappearanceoftheplasticproduct.Finishingprocessessuchasgrinding,polishingandlappingarecommonlyusedtoimprovethesurfacefinish.Themountedgrindingtoolswheelshavebeenwidelyusedinconventionalmoldanddiefinishingindustries.Thegeometricmodelofmountedgrindingtoolsforautomatedsurfacefinishingprocesseswasintroducedin1.Afinishingprocessmodelofsphericalgrindingtoolsforautomatedsurfacefinishingsystemswasdevelopedin2.Grindingspeed,depthofcut,feedrate,andwheelpropertiessuchasabrasivematerialandabrasivegrainsize,arethedominantparametersforthesphericalgrindingprocess,asshowninFig.1.Theoptimalsphericalgrindingparametersfortheinjectionmoldsteelhavenotyetbeeninvestigatedbasedintheliterature.Inrecentyears,someresearchhasbeencarriedoutindeterminingtheoptimalparametersoftheballburnishingprocessFig.2.Forinstance,ithasbeenfoundthatplasticdeformationontheworkpiecesurfacecanbereducedbyusingatungstencarbideballoraroller,thusimprovingthesurfaceroughness,surfacehardness,andfatigueresistance3–6.Theburnishingprocessisaccomplishedbymachiningcenters3,4andlathes5,6.Themainburnishingparametershavingsignificanteffectsonthesurfaceroughnessareballorrollermaterial,burnishingforce,feedrate,burnishingspeed,lubrication,andnumberofburnishingpasses,amongothers3.TheoptimalsurfaceburnishingparametersfortheplasticinjectionmoldsteelPDS5wereacombinationofgreaselubricant,thetungstencarbideball,aburnishingspeedof200mm/min,aburnishingforceof300N,andafeedof40µm7.Thedepthofpenetrationoftheburnishedsurfaceusingtheoptimalballburnishingparameterswasabout2.5microns.Theimprovementofthesurfaceroughnessthroughburnishingprocessgenerallyrangedbetween40and903–7.Theaimofthisstudywastodevelopsphericalgrindingandballburnishingsurfacefinishprocessesofafreeformsurface62plasticinjectionmoldonamachiningcenter.TheflowchartofautomatedsurfacefinishusingsphericalgrindingandballburnishingprocessesisshowninFig.3.Webeganbydesigningandmanufacturingthesphericalgrindingtoolanditsalignmentdeviceforuseonamachiningcenter.TheoptimalsurfacesphericalgrindingparametersweredeterminedbyutilizingaTaguchisorthogonalarraymethod.FourfactorsandthreecorrespondinglevelswerethenchosenfortheTaguchisL18matrixexperiment.Theoptimalmountedsphericalgrindingparametersforsurfacegrindingwerethenappliedtothesurfacefinishofafreeformsurfacecarrier.Toimprovethesurfaceroughness,thegroundsurfacewasfurtherburnished,usingtheoptimalballburnishingparameters.Fig.1.SchematicdiagramofthesphericalgrindingprocessFig.2.SchematicdiagramoftheballburnishingprocessFig.3.Flowchartofautomatedsurfacefinishusingsphericalgrindingandballburnishingprocesses2DesignofthesphericalgrindingtoolanditsalignmentdeviceTocarryoutthepossiblesphericalgrindingprocessofafreeformsurface,thecenteroftheballgrindershouldcoincidewiththezaxisofthemachiningcenter.Themountedsphericalgrindingtoolanditsadjustmentdevicewasdesigned,asshowninFig.4.Theelectricgrinderwasmountedinatoolholderwithtwoadjustablepivotscrews.Thecenterofthegrinderballwaswellalignedwiththehelpoftheconicgrooveofthealignmentcomponents.Havingalignedthegrinderball,twoadjustablepivotscrewsweretightenedafterwhich,thealignmentcomponentscouldberemoved.Thedeviationbetweenthecentercoordinatesoftheballgrinderandthatoftheshankwasabout5µm,whichwasmeasuredbyaCNCcoordinatemeasuringmachine.Theforceinducedbythevibrationofthemachinebedisabsorbedbyahelicalspring.Themanufacturedsphericalgrindingtoolandballburnishingtoolweremounted,asshowninFig.5.Thespindlewaslockedforboththesphericalgrindingprocessandtheballburnishingprocessbyaspindlelockingmechanism.63Fig.4.Schematicillustrationofthesphericalgrindingtoolanditsadjustmentdevice3Planningofthematrixexperiment3.1ConfigurationofTaguchisorthogonalarrayTheeffectsofseveralparameterscanbedeterminedefficientlybyconductingmatrixexperimentsusingTaguchisorthogonalarray8.Tomatchtheaforementionedsphericalgrindingparameters,theabrasivematerialofthegrinderballwiththediameterof10mm,thefeedrate,thedepthofgrinding,andtherevolutionoftheelectricgrinderwereselectedasthefourexperimentalfactorsparametersanddesignatedasfactorAtoDseeTable1inthisresearch.Threelevelssettingsforeachfactorwereconfiguredtocovertherangeofinterest,andwereidentiFig.5.aPhotoofthesphericalgrindingtoolbPhotooftheballburnishingtoolTable1.TheexperimentalfactorsandtheirlevelsFactorLevel123A.AbrasivematerialSiCAl2O3,WAAl2O3,PAB.Feedmm/min50100200C.Depthofgrindingµm205080D.Revolutionrpm120001800024000fiedbythedigits1,2,and3.Threetypesofabrasivematerials,namelysiliconcarbideSiC,whitealuminumoxideAl2O3,WA,andpinkaluminumoxideAl2O3,PA,wereselectedandstudied.Threenumericalvaluesofeachfactorweredeterminedbasedontheprestudyresults.TheL18orthogonalarraywasselectedtoconductthematrixexperimentforfour3levelfactorsofthesphericalgrindingprocess.3.2DefinitionofthedataanalysisEngineeringdesignproblemscanbedividedintosmallerthebettertypes,nominalthebesttypes,largerthebettertypes,signedtargettypes,amongothers8.ThesignaltonoiseS/Nratioisusedastheobjectivefunctionforoptimizingaproductorprocessdesign.Thesurfaceroughnessvalueofthegroundsurfaceviaanadequatecombinationofgrindingparametersshouldbesmallerthanthatoftheoriginalsurface.Consequently,thesphericalgrindingprocessisanexampleofasmallerthebettertypeproblem.TheS/Nratio,η,isdefinedbythefollowingequation8η−10log10meansquarequalitycharacteristic−10log10bracketleftBigg1nnsummationdisplayi1y2ibracketrightBigg.1whereyiobservationsofthequalitycharacteristicunderdifferentnoiseconditionsnnumberofexperimentAftertheS/NratiofromtheexperimentaldataofeachL18orthogonalarrayiscalculated,themaineffectofeachfactorwasdeterminedbyusingananalysisofvarianceANOVAtechniqueandanFratiotest8.Theoptimizationstrategyofthe64smallerthebetterproblemistomaximizeη,asdefinedbyEq.1.Levelsthatmaximizeηwillbeselectedforthefactorsthathaveasignificanteffectonη.Theoptimalconditionsforsphericalgrindingcanthenbedetermined.4ExperimentalworkandresultsThematerialusedinthisstudywasPDS5toolsteelequivalenttoAISIP209,whichiscommonlyusedforthemoldsoflargeplasticinjectionproductsinthefieldofautomobilecomponentsanddomesticappliances.ThehardnessofthismaterialisaboutHRC33HS469.Onespecificadvantageofthismaterialisthataftermachining,themoldcanbedirectlyusedforfurtherfinishingprocesseswithoutheattreatmentduetoitsspecialpretreatment.Thespecimensweredesignedandmanufacturedsothattheycouldbemountedonadynamometertomeasurethereactionforce.ThePDS5specimenwasroughlymachinedandthenmountedonthedynamometertocarryoutthefinemillingonathreeaxismachiningcentermadebyYangIronCompanytypeMV3A,equippedwithaFUNUCCompanyNCcontrollertype0M10.Thepremachinedsurfaceroughnesswasmeasured,usingHommelwerkeT4000equipment,tobeabout1.6µm.Figure6showstheexperimentalsetupofthesphericalgrindingprocess.AMP10touchtriggerprobemadebytheRenishawCompanywasalsointegratedwiththemachiningcentertoolmagazinetomeasureanddeterminethecoordinatedoriginofthespecimentobeground.TheNCcodesneededfortheballburnishingpathweregeneratedbyPowerMILLCAMsoftware.ThesecodescanbetransmittedtotheCNCcontrollerofthemachiningcenterviaRS232serialinterface.Table2summarizesthemeasuredgroundsurfaceroughnessvalueRaandthecalculatedS/NratioofeachL18orthogonalarrayusingEq.1,afterhavingexecutedthe18matrixexperiments.TheaverageS/Nratioforeachlevelofthefourfactorscanbeobtained,aslistedinTable3,bytakingthenumericalvaluesprovidedinTable2.TheaverageS/NratioforeachlevelofthefourfactorsisshowngraphicallyinFig.7.Fig.6.ExperimentalsetuptodeterminetheoptimalsphericalgrindingparametersTable2.GroundsurfaceroughnessofPDS5specimenExp.InnerarrayMeasuredsurfaceResponseno.controlfactorsroughnessvalueRaABCDy1y2y3S/NratioMeanµmµmµmηdByµm111110.350.350.359.1190.350212220.370.360.388.6340.370313330.410.440.407.5970.417421230.630.650.643.8760.640522310.730.770.782.3800.760623120.450.420.397.5200.420731320.340.310.329.8010.323832130.270.250.2811.4710.267933210.320.320.329.8970.3201011220.350.390.408.3900.3801112330.410.500.436.9680.4471213110.400.390.427.8830.4031321130.330.340.319.7120.3271422210.480.500.476.3120.4831523320.570.610.534.8680.5701631310.590.550.545.0300.5601732120.360.360.358.9540.3571833230.570.530.535.2930.543Table3.AverageS/NratiosbyfactorlevelsdBFactorABCDLevel18.0997.6559.1106.770Level25.7787.4537.0678.028Level38.4087.1766.1077.486Effect2.6300.4793.0031.258Rank2413Mean7.428Thegoalinthesphericalgrindingprocessistominimizethesurfaceroughnessvalueofthegroundspecimenbydeterminingtheoptimallevelofeachfactor.Since−logisamonotonedecreasingfunction,weshouldmaximizetheS/Nratio.Consequently,wecandeterminetheoptimallevelforeachfactorasbeingthelevelthathasthehighestvalueofη.Therefore,based

注意事项

本文(外文翻译--对于注塑模具钢研磨和抛光工序的自动化表面处理 英文版.pdf)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5