电气工程及其自动化专业外文翻译.docx
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电气工程及其自动化专业外文翻译.docx
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电气工程及其自动化专业外文翻译
密级:
JINGGANGSHANUNIVERSITY
外文翻译
题目数控加工中心自动换刀系统的研究
学院机电工程学院
专业机械设计制造及其自动化
班级机制11(本1)
学号110611044
姓名封鹿
指导教师
起讫时间2014.11——2015.5
教务处印制
Machinery,2011,12(04)
Researchontheautomatictoolchangersystemofthemanchingcenter
ZHENGXin-wu,ZHANGMing-zhong,LIChun-mu,LIYin,CHENYong-ming
(DepartmentofMechanical&ElectricalEngineering,XiamenUniversity,Xiamen361005,China)
Abstract:
Theautomatictoolchanger(ATC),whichincludesamagazine,atoolchangerandacontrolsystem,isoneofthekeycompomentsofthemachiningcenter(MC),GeneralissuesoftheATC,however,areitsslownessandlowstabilityduringtoolchangesandthecomplexityofcontrolsystemprogramming.Tosolvethoseproblems,onetypeofsoftwareanditsinternalPLCtechnologywereinverstigated.BasedonananalysisofthefundamentalstructureandoperatingprincipleoftheATCsystemandaresearchofthecontrolprocedureofthe“discwitharm”-typeATC,thePLCprogramandmacroprogramscombinedwithServoWorksCNCtechnologyweredeveloped.Finally,itwasshownthatnewlydesignedcontrolsystemcancompletethewholeprocessofchangingtoolsin4to6secondsontheYY-1060verticalMC.Theresultsindicatethattheprocessisrapid,accurateandreliableenoughtocompletelymeetthepracticalrequirements.
Keywords:
machiningcenter(MC);automatictoolchanger(ATC);programmablelogiccontroller(PLC)
1.Introduction
Usingknifelibrary(MAG)automatictoolchangeisthewayoftoolchange,iswidelyusedinmachiningcenterindependentknifelibraryvastlyincreasesthestoragequantityofcuttingtool,whichhelpstoexpandthefunctionofmachinetool,andcanbewellisolatedinterferenceofvariouskindsoffactorsaffectingthemachiningaccuracy.Processingcenterofthelibrarytypesare:
aknifedisctoollibraryandchaintoollibrary.Librarychangetoolwayaccordingtothepresenceofmanipulator,toolchangeprocessintoamanipulatortoolchangeandnomanipulatortoolchange.ThisstudyinordertoYY-1060verticalmachiningcenterisequippedwithDEX-A402disctoollibrarymanipulatorautomatictoolchangemechanismastheobject,studyofautomatictoolchanger(ATC)system.
Programmablecontroller(PLC)isthecorepartofautomatictoolchangesystem.Atpresent,thedomesticcontroloftheautomatictoolchangemorethanthetraditionalPLC(hereinafterreferredtoashardPLC)andsinglechipmicrocomputer,suchasmitsubishiFXseriesPLC,SiemensS7-200seriesPLC,AT98C51microcontroller.HardPLCcontrolmethodwithoutspecialinstructionsofthetool,youneedtowritecomplexcutterPLCprogram,aswellassimplifytheprocessofncprogrammingbymacroprogram;Adoptsinglechipmicrocomputercontrolcircuitstructures,complex,thesystemstabilityislow,programmingcomplex.ThisresearchadoptstheLadderWorksisakindofbuilt-inPLCsystemsoftwarebasedonthetechnologyofServoWorkstype,canbebetweenCNCrapidinternalsignaltransmission.
2.Librarystructureandtoolchangemovement
Automatictoolchangemaincomponentsinclude:
motor,CAM,toolpot,daolibrarymotor,cup,brake,pinecliproundtool,theoriginsignal,etc.DEX-A402automatictoolchangeisshowninfigure1.
Fig.1.AutomatictoolchangeFig.2.Swordarmaction
Swordarmactiondrivenbysteppingmotor,toolchangeactionpoints4stepstocomplete.Singleswordarmmotordirectionofrotation,throughtheautomatictoolchangemechanismofCAMmechanismtocontroltheswordarmandreversing,thedrivemodeimprovestheswordarmrotationAngleprecision,simplifythecontrolofthemotoratthesametime.Swordarmmovementofthespecificprocessasshowninfigure2.
3.Transferinstructions
CNCprogramminginstructionbyT,Minstructionstocompletetheautomatictoolchangeaction,toolchangeinstructiondecodedbytheinternalsystem,thetargettool,andmacroinstruction,translatedintothecorrespondingbinarynumbersavedtothesystemspecifiedintheregister.ServoWorksPLCsystemTinstructiondecodertoF26,MinstructiondecodetoF10,userscanaccordingtotherequestofchangeknifeactionwritemacroprogramandPLCprogram.Tdirectivespecifiesthetool,completingthelibrarychoosetool,toollibraryrotationdirectionjudgmentanddeterminationofrotatinginterval;Mdirectivespecifiesthemacroprogram,accordingtotherequirementsintoolcompletespindlebacktozero,theZaxispointbacktochangethetool,thetoolarmrotatingdirection,locationandtoolcupupanddownmovement.
3.1Thechoiceofcutter(T)
Cuttingtoolchoiceistoollibraryspecifiedonthetooltochangethecutterlocation,theactionbytheTinstructionfunction.Automatictoolchanger(ATC)systembasedoninformationfromthepositionofthetoolstorageandTinstruction,accordingtothegivencommandandcontrolsystemdecidetheknifelibrarydirectionofrotation,therequirementsofthesteps,etc.,generally,thememorycanbeusedtomodelrandomcontrolandmechanicalcontrolintwoways.Correspondingtotheirrespectivemechanicalrandomcontroleverytoolset,usuallybetweenthespindleandthetoolstorage,toprovidetoolchange"middletoolset".Memorymodel,bycontrast,stochasticcontrolusingapointer,pointerpointsoutthatthepositionoftoollibraryrotation,eachknivesandtoolsetisnotalwaysone-to-onecorrespondence,thecontrolmodechangequicklyandreliable.Inaccordingtothemechanicalstructureofthetoolstoragechoicesintoolcontrolmode,thefollowingsystemofpointertoafloatswitchtoolway:
bytheuserTdirectivespecifiesatool,afterdecodingsystem,foundinthefloatingofthepointertothememorynumbercorrespondingtothecuttingtool,thesystemusespecialinstructionROTBdirectionofrotationandrotationdistancejudgmenttheknife,toollibraryrotationtothetargetlocationchoicetoolfinishtool,M6instructionscompletedactioninthetool,thespecificprocessasshowninfigure3.
Fig.3.Flowchartofchoosingtools
3.2Transferinstructions(M)
AuxiliaryMinstructiondecodingthroughthesystemtothePLC"rumet"point(internalrelay),userswritePLCprogramaccordingtotheactionrequirement.ATCauxiliaryMinstructionsincludeM6inknife,M19spindlepositioning,initializationM86toollibrary,etc.Machiningcenterlibrarychangeknifeprocessasshowninfigure4.
Fig.4.Inflowchart
ServoWorksCNCcanaccordingtotheneedsofuserscustomizetheG/M/S/Tmacrocallsimplifyncprogramming,commonlyusedmachinetoolmovementprogramcanbeintegratedintoacommand,suchasusingM06completethechangemovement.ThemacroprogramcancallwiththesameauxiliaryMinstructions.Withinthesystemtospecifyinstructionsstoredmobilestorageunitclassification,suchasG00,G01,G02G03instructionsstoredinthesystemvariablessuchas#4001.Macrocallsthemethodisasfollows:
O9001
G40G80
#510=#4001
#511=#4001
#512=#4003
#513=#1032AND256
#514=#BIN[#513]
(IF[#512EQ#514]GOTON1000)
G90G30Z0
M19
M6
G#510G#511
N1000M99
4.ThePLCprogramdevelopment
AutomatictoolchangethePLCprogrammainlyincludesthelibrarychoosetoolandswordarminapplication.ServoWorksPLCprogramaddressesare:
machinetoolstothePLCinputsignal(X),PLCtotheinputsignal(Y)machinetools,CNCenginesignaltothePLCengine(F),PLCenginetotheCNCenginesignal(G),intermediaterelay(R),counter(C),thetimer(T),etc.Thefollowing"rumet"pointdescriptiontoolchangebyPLC.
4.1LibrarychooseknifePLCprogram
LadderWorksPLCbasedautomatictoolchangeorder(asshowninfigure3)are:
tools,searchinstructionsDSCH,rotatingdirectionanddistancecalculationROTBCTR,libraryrotatingtoolcountinstructions.
DEX-A402toollibrarytoolingcapacityfor24,daolibrarytochoosethemainPLCprogramasshowninfigure5.ProgramR270storagetargettool,DSCHinstructioninD20of25theaddressofthestorageunittofindthesameastheR270content,andstoredintheR280;COspecifiesthetoolingcapacity,toollibraryROTBinstructionreal-timecomputingtargettoolR290andcurrenttoolcup,cuponC2,thestepdistanceanddirectionbetweentheR283fromstoragecloth,R203.6storagedirectionofrotation;C2countdonebyCRTinstruction,knifelibraryrotationdirectionR960.3decidedtoC2countsincreaseanddecrease,R200.4forsignalsofcount.
4.2TheknifearminPLCprogram
IntherotationofthePLCprogramtorealizetoolarmmotioncontrol.AutomatictoolchangethroughthemotordrivetheCAMarmmovementcontroltheknife,knifearmwithwheelbrakingsignalsandtheCAMsignalwheelbrakesignal,pinenippeddaosignals,theorigin,throughtheabovesignalsequencediagramwritebrakeposition.Position1correspondstotheoriginposition,position2correspondingtoolarmforward60degrees,position3correspondingknifearmisturned180degrees.ThisresearchaccordingtotheflowchartoftoolchangewrittenintoolPLCprogram,asshowninfigure6.
Fig.5.LibrarychoosetoolapplicationFig6.InPLCprogram
4.3Storageunitnumberswaps
Automatictoolchangerisarandomcontinuousprocess,thetoolchangeafterthecompletionoftheneedtomodifythecontentinthestorageunit,ensureaccuratetoolchangenexttime.Storageunittool,swaps,completethespindlecutternumberD20andpresentcorrespondingtool,toolcuponD+C2(20)exchange,throughtheintermediatestorageD18transition,specificimplementationwayasshowninfigure7.
Fig.7.Accessunitknifeswaps
XMOVinstructionstocompletethestorageunitdataread,write,readoperationonRW=0,RW=1toperformwriteoperations.
5.Test
LadderWorksconsoleisacollectionofPLCprogramcreating,editing,comp
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