外文翻译模具型腔数控加工计算机辅助刀具选择和研究.docx

外文翻译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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外文翻译模具型腔数控加工计算机辅助刀具选择和研究

Mouldtypeofnumericalcontrolprocesscomputerassistthecutterchooseandstudy

Foreword

Numericalcontrolincludecutterproductionandcutteroforbitchoosetwokeyproblemsprocess,.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,becausethegeometircformiscomplicated（usuallyincludecurvedsurfaceoffreedomandisland）,influencegeometrythatcutterchooseitrestrainsfromtobecanexplicittosayamongCADmodel,needtodesignthecorrespondingalgorithmtodraw,thereforechoosethecutterspecificationsuitableandcutterassociation,itisnoteasythingsbyimprovingefficiencyandqualityprocessedinnumericalcontrol.

Mouldtypegenerallywithpreparationmethodthatnumericalcontrolmill,usuallyincludingroughmachining,halffinishmachining,preciseprocessofprocessingetc..Theprincipleofroughmachiningistosparenoefforttoremovethesurplusmetalwithhighefficiency,thereforehopetochoosethelargercutter,butthecutterisoversized,maycausetheincreaseofthecrudevolume;Halffinishmachiningoftaskstoremoveroughmachiningleaveoverstepthatgetoffmainly;Finishmachiningmainlyguaranteessizeofthepartandsurfacequality.Consider,goon,selectexist,surebycomputerdifficultautomaticallytotallyuptillnow,thereforeassistthecuttertochooseinthecomputerthatwedeveloped（ComputerAidedToolSelection,CATS）amongthesystem,baseon,provideoneaiddecisiontoolforuser,roughmachining,halffinishmachining,precisetoprocessetc.,therealpolicy-makingpowerisstilllefttousers,inordertogivefullplaytotheadvantagesofcomputerandpeople.

1Basicstructureofthesystem

CATSsystemisCADmodel,outputforcuttertype,cutterspecification,milldepthofsharpening,enterthegivingamount,rotationalspeedofmainshaft（cutthepace）andprocesssixparameterssuchastime（suchasFig.1）,includingchoosingtheaiddecisiontoolincuttertype,roughmachiningcutterchooseaiddecisiontool,halffinishmachiningcutterchooseaiddecisiontoolandfinishmachiningcutterchooseaiddecisiontool,etc.

GiventheroughmachininginXingqiangprocessingoftheimportantposition（usuallyrelytime5~10times）,roughmachining,thesystemautomaticallyoptimizeportfoliowithcutleryfunctionstoenhanceoverallprocessingefficiency.Inadditiontothedecision-makingtools,thesystemalsohasadetailedlookcutlerynorms,basedonthetypeandsizecutleryrecommendedprocessingparametersandassessthefunctionofprocessingtime,thelastgenerationoftheoverallresultsofchoicecutlerystatements（figure2）.Allthedataandknowledgesystemscutlerydonebythebackgrounddatabasesupport.

2Keytechnologiesandalgorithms

2.1Cutlerytypechoice

AccordingtoAssistantXingqiangdigitalprocessingpractice,XingqiangXistategeneralprocessingcutleryintomillingcutter,millingcutterradiusmillingcutterandthefirstthreeballs.Dbasedcutlerydiameter,radiusradiusrwhenr=0formillingcutter,0

Cutlerycanbedividedintotheoverallstyleandembedfilmsceremony.Forinlayfilmstyle,thekeyistoselectthematerialsrazorblades,razorbladesmaterialschoicedependsonthreeelements:

theprocessingofworkingmaterials,machinetoolsandcutleryjigstabilityofthestatestructures.Processingsystemwillbetranslatedintomaterialsteel,stainlesssteel,castiron,nonferrousmetals,materialsandhardtocutmaterialssixgroups.Machinetooljigstabilityintogood,betterandlessthanthreelevels.Cutleryinvestigationintotheshortandlongcantileverstructurestwo,thesystemautomaticallyreasoningonthebasisofthespecificcircumstancesofrazorbladesmaterials,decision-makingknowledgefromWaltercutlerymanualsystembytheusersfirstchoicecutlerytypeintheworld.Toembedfilmstylecutlery,arules-basedautomatedreasoningsuitablerazorbladesmaterials.Forexample,ifthefinalprocessingofmaterialsforthe"steel",machinetooljigforgoodstability,cutlerycantileverstructuresforshort,razorbladesmaterialsforWAP25.

Roughmachiningcutleryportfoliooptimization

Xingqiangroughmachiningtheaimistomaximizetheremovalofexcessmetalnormallyusedmillingcutter,take-cuttingapproach.Thus,3DmouldXingqiangtheroughmachiningprocess,isactuallyaseriesof2.5DcomponentsXingqiangprocessing.Cutleryoptimizationistofindagroupofcutleryportfolio,allowingformaximumefficiencyremovalofmostmetals.Cutleryportfoliooptimizedbasicmethodsasfollows:

A.TodosomelongstepintoknifeinthedirectionofagroupofverticalandhorizontalsearchXingqianganotherentitytoformasearchlayer.

B.Deriveclosedtothecontours.

C.CalculatedbetweenCentralandoutsidetheislandorislandsandthedistancebetweenthekeythataffectcutlerychoicegeometricconstraintsalgorithmflowAsshowninfigure3

D.Accordingtotheprincipleofthemerger（adjacenttothecriticaldistancewillbesmallerthanthedifferencebetweenthethreshold）tosearchlayermerger,graphicprocessingandidentifyingviablecutlerysets,aprocessinglayer.

E.Determinetheuseofeachprocessinglayercutlery,cutleryXingqiangprocessingportfolio.

F.Accordingcutleryrecommendedprocessingparameters（cuttingspeed,depthandintoXianxiaotospeed）,thecalculationofmaterialremoval.

G.Accordingtotheactualremovalofthevolumeprocessinglayer,theprocessingtimeforeachprocessinglayer.

H.Xingqiangcalculatingthetotalprocessingtimeandresidualvolume.

I.TheoverallportfoliooftheGroupcutleryprocessingefficiencyassessment.

J.Repeata~iuntilderiveoptimalmixofcutlery.Iftimeisthegoal,calledfortheentireprocessingtimetXingqiangshortestportfoliotooptimizecutlery.

2.2Semi-finishedcutlerychoice

Themainpurposeistoremovesemi-finishedroughmachiningresidualcontoursofthenewwarrants.Tocompletelyremoveheight,depthmustbegreaterthanXianxiaopartsofeachleveltothesurfacedistancex.Itsalgorithmstepsareasfollows:

Step1:

entitymodelsfrompartsoftwoadjacenttothecrosssectionofthesurfacecontoursandthecorrespondinglength;

Step2:

Theaveragelengthofcontours;

Step3:

calculateitswidth;

Step4:

calculatingheightfloortothesurfaceofpartstothelawdistancex;

Step5:

steps1~repeatsteps4,eachlevelofdecisionXianxiaodepth;

Step6:

calculatecutlerydiameterD,byorundercutleryexperienceD=x/0.6manualrecommended;

steps7:

chooseXianxiaoxdepththanthesmallestcutlery.

2.3finecutlerychoice

Finecutlerychoiceisthebasicprinciple:

cutlerypartssurfaceradiussmallerthanthesmallestsizeRcurveradiusr,thegeneraladmissionR=（0.8~0.9）r.Itsalgorithmstepsareasfollows:

Step1:

fromthesmallestcurveradiuscalculationmodelpartsentities;

Step2:

Fromcutlerydatabasesearchradiusoflessthanacutlerycalculatedradiusofthecurveallcutlery;

Step3:

selectthebestcutlerymeettheaboverequirements;

Step4:

Ifallcutlerythanthesmallestcurveradius,thesmallestchosenasarecommendedcutlery.

4summaryanddiscussion

Mouldtypeofcraftofprocessingplan,needhightechnologyandexperienceveryusually,prepareNCtimeofdatanearlyandprocesstimetobelarge.SopersonwhoproduceofcraftofprocessingplanandNCprocessdemandoftheorderrightawayseemfurthermoreurgentautomatically.

Thistextsystemresearchmouldtypeofcraftcutterplan,chooseproblem,putforwardmouldofroughmachining,halffinishmachining,finishmachiningprincipleandmethodthatcutterchooses,therealizationalgorithmwithcorrespondingstructure,andhascarriedontherealizationofpreliminaryprogrammingundertheenvironmentofUG/OPENAPI,havedevelopedCATSprototypesystem.Incuttertypeandonthefoundationthatthespecificationisfixed,systemalsocanrecommendparameterofprocessingaccordingtocuttermanual（cutpace,mill,sharpendepth,enterpersonwhogive,etc.）,evaluatecorrespondingprocessingtime.FinalpurposeitstorealizeintegrationofCAD/CAMreally,producethroughaftertreatmentnumericalcontrolprocesstheorder.

Needtopointout,shouldimprovethemouldtypetotalityofandprocessefficiency,needitfromtheroughmachining,halffinishmachining,considerationonthewholeoffinishmachining,makeupandoptimizemanytargets,thiswillbeworkthatwe