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外文翻译--模具型腔数控加工计算机辅助刀具选择和研究.doc

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外文翻译--模具型腔数控加工计算机辅助刀具选择和研究.doc

毕业设计(论文)外文文献翻译题目专业名称机械设计制造及其自动化班级学号学生姓名指导教师填表日期2011年05月20日MouldtypeofnumericalcontrolprocesscomputerassistthecutterchooseandstudyForewordNumericalcontrolincludecutterproductionandcutteroforbitchoosetwokeyproblemsprocess,.Thefirstproblemhasbeengotandstudiedextensivlyanddeeplyoverthepast20years,alotofalgorithmsdevelopedhavealreadygotapplicationincommercialCAD/CAMsystem.MostCAMsystemscanproducethecutterorbitautomaticallyafterusersinputrelevantparametersatpresent.Comparativelyspeaking,itisstillnotripetoregardquality,efficiencyastheresearchofchoosingtheproblemofcutterofoptimizingthegoalcorrectly,donothavecommercialCAMsystemthatcanofferthepreferreddecisionsupporttoolofcutteratpresent,thereforeitisdifficulttorealizetheintegratingautomaticallyandorganicallyofCAD/CAM..Thecutterischosentousuallyincludecuttertypeandcuttersize.Generallyspeaking,suitableforoneprocessingcutteroftargetformuchkind,onecuttercanfinishdifferentprocessingtasks,soitiseasiertoonlyconsidermeetingthecutterthatbasicallyprocessestherequirementandchoose,especiallytogeometirccharacteristicsofmodelsuchasthehole,trough,etc..Butinfact,itiscommonforcuttertochooseandsureoptimizationgoalinterrelate,forinstancemostheavytocutefficiency,processtime,minimumprocesscost,longestservicelife,etc.atleast,sothecutterischosenitisacomplicatedoptimizationquestion.Suchasmouldtypeoneofparts,becausethegeometircformiscomplicatedusuallyincludecurvedsurfaceoffreedomandisland,influencegeometrythatcutterchooseitrestrainsfromtobecanexplicittosayamongCADmodel,needtodesignthecorrespondingalgorithmtodraw,thereforechoosethecutterspecificationsuitableandcutterassociation,itisnoteasythingsbyimprovingefficiencyandqualityprocessedinnumericalcontrol.Mouldtypegenerallywithpreparationmethodthatnumericalcontrolmill,usuallyincludingroughmachining,halffinishmachining,preciseprocessofprocessingetc..Theprincipleofroughmachiningistosparenoefforttoremovethesurplusmetalwithhighefficiency,thereforehopetochoosethelargercutter,butthecutterisoversized,maycausetheincreaseofthecrudevolumeHalffinishmachiningoftaskstoremoveroughmachiningleaveoverstepthatgetoffmainlyFinishmachiningmainlyguaranteessizeofthepartandsurfacequality.Consider,goon,selectexist,surebycomputerdifficultautomaticallytotallyuptillnow,thereforeassistthecuttertochooseinthecomputerthatwedevelopedComputerAidedToolSelection,CATSamongthesystem,baseon,provideoneaiddecisiontoolforuser,roughmachining,halffinishmachining,precisetoprocessetc.,therealpolicymakingpowerisstilllefttousers,inordertogivefullplaytotheadvantagesofcomputerandpeople.1BasicstructureofthesystemCATSsystemisCADmodel,outputforcuttertype,cutterspecification,milldepthofsharpening,enterthegivingamount,rotationalspeedofmainshaftcutthepaceandprocesssixparameterssuchastimesuchasFig.1,includingchoosingtheaiddecisiontoolincuttertype,roughmachiningcutterchooseaiddecisiontool,halffinishmachiningcutterchooseaiddecisiontoolandfinishmachiningcutterchooseaiddecisiontool,etc.GiventheroughmachininginXingqiangprocessingoftheimportantpositionusuallyrelytime510times,roughmachining,thesystemautomaticallyoptimizeportfoliowithcutleryfunctionstoenhanceoverallprocessingefficiency.Inadditiontothedecisionmakingtools,thesystemalsohasadetailedlookcutlerynorms,basedonthetypeandsizecutleryrecommendedprocessingparametersandassessthefunctionofprocessingtime,thelastgenerationoftheoverallresultsofchoicecutlerystatementsfigure2.Allthedataandknowledgesystemscutlerydonebythebackgrounddatabasesupport.2Keytechnologiesandalgorithms2.1CutlerytypechoiceAccordingtoAssistantXingqiangdigitalprocessingpractice,XingqiangXistategeneralprocessingcutleryintomillingcutter,millingcutterradiusmillingcutterandthefirstthreeballs.Dbasedcutlerydiameter,radiusradiusrwhenr0formillingcutter,0RCutlerycanbedividedintotheoverallstyleandembedfilmsceremony.Forinlayfilmstyle,thekeyistoselectthematerialsrazorblades,razorbladesmaterialschoicedependsonthreeelementstheprocessingofworkingmaterials,machinetoolsandcutleryjigstabilityofthestatestructures.Processingsystemwillbetranslatedintomaterialsteel,stainlesssteel,castiron,nonferrousmetals,materialsandhardtocutmaterialssixgroups.Machinetooljigstabilityintogood,betterandlessthanthreelevels.Cutleryinvestigationintotheshortandlongcantileverstructurestwo,thesystemautomaticallyreasoningonthebasisofthespecificcircumstancesofrazorbladesmaterials,decisionmakingknowledgefromWaltercutlerymanualsystembytheusersfirstchoicecutlerytypeintheworld.Toembedfilmstylecutlery,arulesbasedautomatedreasoningsuitablerazorbladesmaterials.Forexample,ifthefinalprocessingofmaterialsforthesteel,machinetooljigforgoodstability,cutlerycantileverstructuresforshort,razorbladesmaterialsforWAP25.RoughmachiningcutleryportfoliooptimizationXingqiangroughmachiningtheaimistomaximizetheremovalofexcessmetalnormallyusedmillingcutter,takecuttingapproach.Thus,3DmouldXingqiangtheroughmachiningprocess,isactuallyaseriesof2.5DcomponentsXingqiangprocessing.Cutleryoptimizationistofindagroupofcutleryportfolio,allowingformaximumefficiencyremovalofmostmetals.CutleryportfoliooptimizedbasicmethodsasfollowsA.TodosomelongstepintoknifeinthedirectionofagroupofverticalandhorizontalsearchXingqianganotherentitytoformasearchlayer.B.Deriveclosedtothecontours.C.CalculatedbetweenCentralandoutsidetheislandorislandsandthedistancebetweenthekeythataffectcutlerychoicegeometricconstraintsalgorithmflowAsshowninfigure3D.Accordingtotheprincipleofthemergeradjacenttothecriticaldistancewillbesmallerthanthedifferencebetweenthethresholdtosearchlayermerger,graphicprocessingandidentifyingviablecutlerysets,aprocessinglayer.E.Determinetheuseofeachprocessinglayercutlery,cutleryXingqiangprocessingportfolio.F.Accordingcutleryrecommendedprocessingparameterscuttingspeed,depthandintoXianxiaotospeed,thecalculationofmaterialremoval.G.Accordingtotheactualremovalofthevolumeprocessinglayer,theprocessingtimeforeachprocessinglayer.H.Xingqiangcalculatingthetotalprocessingtimeandresidualvolume.

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