模具型腔数控加工计算机辅助刀具选择和研究.docx

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1、MouldtypeofnumericalcontrolprocesscomputerassistthecutterchooseandstudyForewordNumericalcontrolincludecutterproductionandcutteroforbitchoosetwokeyproblemsprocess,.Thefirstproblemhasbeengotandstudiedextensivlyanddeeplyoverthepast20years,alotofalgorithmsdevelopedhavealreadygotapplicationincommercialCA

2、D/CAMsystem.MostCAMsystemscanproducethecutterorbitautomaticallyafterusersinputrelevantparametersatpresent.Comparativelyspeaking,itisstillnotripetoregardquality,efficiencyastheresearchofchoosingtheproblemofcutterofoptimizingthegoalcorrectly,donothavecommercialCAMsystemthatcanofferthepreferreddecision

3、supporttoolofcutteratpresent,thereforeitisdifficulttorealizetheintegratingautomaticallyandorganicallyofCAD/CAM.Thecutterischosentousuallyincludecuttertypeandcuttersize.Generallyspeaking,suitableforoneprocessingcutteroftargetformuchkind,onecuttercanfinishdifferentprocessingtasks,soitiseasiertoonlycon

4、sidermeetingthecutterthatbasicallyprocessestherequirementandchoose,especiallytogeometirccharacteristicsofmodelsuchasthehole,trough,etc.Butinfact,itiscommonforcuttertochooseandsureoptimizationgoalinterrelate,forinstancemostheavytocutefficiency,processtime,minimumprocesscost,longestservicelife,etc.atl

5、east,sothecutterischosenitisacomplicatedoptimizationquestion.Suchasmouldtypeoneofparts,becausethegeometircformiscomplicated(usuallyincludecurvedsurfaceoffreedomandisland),influencegeometrythatcutterchooseitrestrainsfromtobecanexplicittosayamongCADmodel,needtodesignthecorrespondingalgorithmtodraw,the

6、reforechoosethecutterspecificationsuitableandcutterassociation,itisnoteasythingsbyimprovingefficiencyandqualityprocessedinnumericalcontrol.Mouldtypegenerallywithpreparationmethodthatnumericalcontrolmill,usuallyincludingroughmachining,halffinishmachining,preciseprocessofprocessingetc.Theprincipleofro

7、ughmachiningistosparenoefforttoremovethesurplusmetalwithhighefficiency,thereforehopetochoosethelargercutter,butthecutterisoversized,maycausetheincreaseofthecrudevolume;Halffinishmachiningoftaskstoremoveroughmachiningleaveoverstepthatgetoffmainly;Finishmachiningmainlyguaranteessizeofthepartandsurface

8、quality.Consider,goon,selectexist,surebycomputerdifficultautomaticallytotallyuptillnow,thereforeassistthecuttertochooseinthecomputerthatwedeveloped(ComputerAidedToolSelection,CATS)amongthesystem,baseon,provideoneaiddecisiontoolforuser,roughmachining,halffinishmachining,precisetoprocessetc.,therealpo

9、licy-makingpowerisstilllefttousers,inordertogivefullplaytotheadvantagesofcomputerandpeople.1 BasicstructureofthesystemCATSsystemisCADmodel,outputforcuttertype,cutterspecification,milldepthofsharpening,enterthegivingamount,rotationalspeedofmainshaft(cutthepace)andprocesssixparameterssuchastime(suchas

10、Fig.I),includingchoosingtheaiddecisiontoolincuttertype,roughmachiningcutterchooseaiddecisiontool,halffinishmachiningcutterchooseaiddecisiontoolandfinishmachiningcutterchooseaiddecisiontool,etc.GiventheroughmachininginXingqiangprocessingoftheimportantposition(usuallyrelytime5l0times),roughmachining,t

11、hesystemautomaticallyoptimizeportfoliowithcutleryfunctionstoenhanceoverallprocessingefficiency.Inadditiontothedecision-makingtools,thesystemalsohasadetailedlookcutlerynorms,basedonthetypeandsizecutleryrecommendedprocessingparametersandassessthefunctionofprocessingtime,thelastgenerationoftheoverallre

12、sultsofchoicecutlerystatements(figure2).Allthedataandknowledgesystemscutlerydonebythebackgrounddatabasesupport.2 Keytechnologiesandalgorithms2.1 CutlerytypechoiceAccordingtoAssistantXingqiangdigitalprocessingpractice,XingqiangXistategeneralprocessingcutleryintomillingcutter,millingcutterradiusmillin

13、gcutterandthefirstthreeballs.Dbasedcutlerydiameter,radiusradiusrwhenr=0formillingcutter,0RCutlerycanbedividedintotheoverallstyleandembedfilmsceremony.Forinlayfilmstyle,thekeyistoselectthematerialsrazorblades,razorbladesmaterialschoicedependsonthreeelements:theprocessingofworkingmaterials,machinetool

14、sandcutleryjigstabilityofthestatestructures.Processingsystemwillbetranslatedintomaterialsteel,stainlesssteel,castiron,nonferrousmetals,materialsandhardtocutmaterialssixgroups.Machinetooljigstabilityintogood,betterandlessthanthreelevels.Cutleryinvestigationintotheshortandlongcantileverstructurestwo,t

15、hesystemautomaticallyreasoningonthebasisofthespecificcircumstancesofrazorbladesmaterials,decision-makingknowledgefromWaltercutlerymanualsystembytheusersfirstchoicecutlerytypeintheworld.Toembedfilmstylecutlery,arules-basedautomatedreasoningsuitablerazorbladesmaterials.Forexample,ifthefinalprocessingo

16、fmaterialsforthesteel,machinetooljigforgoodstability,cutlerycantileverstructuresforshort,razorbladesmaterialsforWAP25.RoughmachiningcutleryportfoliooptimizationXingqiangroughmachiningtheaimistomaximizetheremovalofexcessmetalnormallyusedmillingcutter,take-cuttingapproach.Thus,3DmouldXingqiangtheroughmachiningprocess,isactuallyaseriesof2.5DcomponentsXingqiangprocessing.Cutleryoptimizationistofindagroupofcutleryportfolio,allowingformaximumefficiencyremovalofmostmetals