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What are the fault checking methods for electrical equipment of CNC machine tools?

1.Faultinvestigationbeforemaintenance Whenanindustrialmachinehasanelectricalfault,itshouldnotbeblindlyandmanuallyrepaired.Firstofall,theCNCmachineoperatororthepersonpresentatthetimeofthefaultisaskedaboutthefaultphenomenon.Itisthefirsttimethatitsuddenlyoccurs,oroccursfrequently,thefaultoccurs,whethertheexternalphenomenonhassmoke,flashover,abnormalsound,thesurroundingenvironmentwhenthefaultoccurs,whetherthereisanyGas,whethercorrosivegasiscorroded,whetherthereiswaterleakage,whethertheheatsourcecauseselectricaldamage,etc.;whetherithasbeenrepaired,thecontentsoftherepair,whatoperationsandmalfunctions. BecausetheoperatorofCNCmachinetoolsismostfamiliarwiththeperformanceofthisCNCmachinetool,itisalsothefirsttounderstandthepossiblecausesandpartsofthefault,whichisbeneficialtotheCNCmachinetoolmaintenancepersonneltojudgethescopeofthefaultandanalyzethefaultbasedontherelevantworkingprinciple.Causes. Beforetheinspection,youcanunderstandtheoperationsituationbeforeandafterthefaultandtheabnormalphenomenonafterthefaultoccursbyasking,watching,listeningandtouching,soastojudgethefaultoccurrencelocationaccordingtothefaultphenomenon,andthenaccuratelyeliminatethefault.Q:Asktheoperatorabouttheoperationstatusofthecircuitandequipmentbeforeandafterthefaultandthesymptomsafterthefaultoccurs.Whetherthefaultoccursfrequentlyoroccasionally;whethertherearesignssuchasnoise,smoke,sparks,abnormalvibration,etc.Largeandfrequentstart,stop,brake,etc.;whetherthereismaintenanceorrepairormodificationoftheline.Look:Checkwhetherthereareobvioussignsofappearancebeforethefailure,suchasvarioussignals;theconditionofthefusewiththeindicatingdevice;thetrippingactionoftheprotectivedevice;thedisconnectionofthewire;thesingeingorweldingofthecontact;theoverheatingofthecoil.Listen:Underthepremisethatthelinecanstillrunandnotdamagetheequipment,youcanpoweronthetest,andlistencarefullytothesoundofelectricalappliancessuchasmotorcontactorsandrelays.Touch:Aftercuttingoffthepowersupply,touchthemotor,transformer,solenoidandfuseassoonaspossibletoseeifthereisoverheating. Throughtheaboveinvestigation,wehaveapreliminaryunderstandingofthephenomenonofthefault,whichreflectsvariousfaultproblems,andthefaultphenomenonandthefaulttypeareone-to-onecorrespondence.Aslongaswecangraspthesignsreflectedbythephenomenon,itisnotdifficulttofindFoundthefault. 2.Determineandnarrowthefaultrangebylogicanalysis Accordingtotheunderstandingandunderstandingofthefaultphenomenon,furtherclassifytheelectricalfaultphenomenon,andclarifywhetherthefaultisinthemotorpart,themaincircuitpart,orthecontrolcircuitpartfault,orthefaultofthecontrolelectricalcomponentitself. 3.Findanddeterminethefaultpointaccordingtothefaultrange. Afterdeterminingthepossiblerangeofthefault,itisnecessarytofurtherdeterminethefaultpoint.Tofindthefaultpoint,acorrectandeffectivemethodmustbeapplied. 3.1Visualinspectionofthefaultrange Afterdeterminingthepossiblerangeofthefault,visualinspectionoftheelectricalcomponentsandconnectingwiresintherange,forexample:meltblownofthefuse;looseorloosewirejoint;contactorcontactofthecontactorandrelay,Whenthecoilisburntout,thesurfaceinsulatingpaperisburntanddiscolored,andtheburntinsulatingvarnishflowsout;thespringisdetachedorbroken;theactionmechanismoftheelectricalswitchisblockedandthelike,andthefaultpointcanbeclearlyindicated. 3.2Determinethepointoffailurebymeansofapower-ontestrun Whenthefaultisnotdetectedbythevisualinspection,thefaultmaybeanalyzedaccordingtothefaultphenomenonandthecircuitdiagramisusedtoconfirmthatthefaultwillnotbefurtherexpandedandthepersonalandequipmentaccidentsmayoccur.Inordertomoreaccuratelyunderstandthepossiblecauses,thepowertestcanbeperformed.Check(removetheloadwiringifnecessary)todistinguishwhetherthefaultmaybeintheelectricalpartorinotherpartsofthemachine;onthemotororonthecontroldevice;onthemaincircuitoronthecontrolcircuit,undernormalcircumstancesCheckthecontrolcircuit.Thespecificmethodisasfollows:Whenabuttonorswitchisoperated,therelevantcontactorsandrelaysinthelinewillworkinthespecifiedsequenceofactions.Ifyoumovetoanelectricalcomponentinsequence,itisfoundthattheactiondoesnotmeettherequirements,indicatingthattheelectricalcomponentoritsrelatedcircuithasaproblem.Theninthiscircuittocarryoutitem-by-itemanalysisandinspection,generallycanfindfaults.Afterthefaultofthecontrolcircuitisrestoredtonormal,themaincircuitisturnedon,thecontroleffectonthemaincircuitischecked,andtheoperationofthemaincircuitisobservedforabnormality. 3.3Accordingtothefaultrange,thefaultisdeterminedbydetection Whenthefaultrangebelongstoacertainpart,theinstrument,theinstrumentandthecorrespondingdetectionmethodarefurtherusedtofurthernarrowthefaultfromalargerrangeandfinallydeterminetothefaultpoint.Articlelink:ChinaMachineToolBusinessNetworkhttp://www.jc35.com/news/detail/56742.html

CNC boring and milling machine process characteristics

CNCboringandmillingmachineisakindofprocessingtoolcommonlyusedintheprocessingindustry.Itcombinesthetwofunctionsoftheboringmachineandthemillingmachinetomaketheprocessingefficiencyhigherandtheprecisionbetter,whichgreatlyimprovestheproductqualityandlaborefficiency.WhatarethetechnicalcharacteristicsofCNCboringandmillingmachines? CNCboringandmillingmachinesaremainlysuitablefortheprocessingofvariousmechanicalparts,especiallymechanicaltransmissionboxesandvariouscurvedbodyparts.Duetotheimprovementofvariousequipmenttechnologylevels,themechanicalstructurerequirementsaremoreandmoresimplified,andfewertransmissioncomponentsarerequired,especiallyasthepartsofthetransmissioncasearelessandless,themechanicaltransmissionismostlydrivendirectly,andthetransmissionpartsareTheprecisionrequirementsareveryhigh,whichputshigherrequirementsontheprocessperformanceoftheCNCboringandmillingmachine.Therefore,asaconventionalboring-axisstructure,thenumberofobjectstobeprocessedisdecreasing,anditwillbereplacedbyashaftlessshafttypeelectricspindle,thatis,ahigh-speedmachiningcenterisusedtocompletevariousparts.ThedevelopmentofCNCboringandmillingmachinetohigh-speedmachiningcenter,ontheonehand,theprocessadaptabilityisstronger,ontheotherhand,theperformancelevelandmachiningaccuracyarealsoimproved.Whilethescopeoftheprocessingtechnologyisincreased,variousfunctionalaccessoriesarerequiredforprocessguarantee.Milling,candrill,tap,installCNCanglemillingheadaccessories,andcanalsoprocessavarietyofcurvedbodyparts.Equippedwithanexchangetabletoformaflexiblemachiningunitforbatchprocessingofparts. Boringandmillingmachinealsohasfloor-standingmillingandboringmachine Thefloor-standingmillingandboringmachinemainlyprocesseslargeandsuper-largepartsofvariousprofiles.Itstechnologicalfeaturesareequippedwithalargefloor-standingplatform(thesizeoftheworktableisnotlimited),whichcanprocessultra-longandextra-wideparts.Atthesametime,itcanalsobeequippedwitharotarytable,whichcanbeusedforrotaryindexing,andcanalsobeusedforradiallinearmotion.Themulti-ordermachiningofpartsiscompletedbyindexing,whichgreatlyimprovestheprocessrange.Thefloor-standingmillingandboringmachineisspeciallyequippedwithatilt-adjustableangletabletofurtherexpandtheprocessingrange.Thehigh-powerandhigh-efficiencycuttingisamajorprocessingadvantageofthefloor-typemillingandboringmachine.Thehigh-speedandhigh-precisiontechnicalrequirementshavemoreandmoreaffectedthetechnicaldevelopmentofthefloor-standingmillingandboringmachine,anditisanimportantmeanstoimprovethelevelofthefloor-standingmillingandboringmachine.Therefore,thefloor-standingmillingandboringmachineischangingasinglehigh-power,high-efficiencycutting,andmoreintothehigh-speed,high-precisionprocesstechnologyconnotation.Nowadays,theramstructureisthemainstructuraltypethathasbeenprocessedforhigh-speedmilling.Theramhasalargecrosssection,highrigidityandhigh-speedrunningstability.Itiseasytoinstallvariousmillingheadaccessoriesforhigh-speedmachining. Withthecontinuousdevelopmentofthesociety,theCNCboringandmillingmachinetechnologyhasalsodevelopedquiterapidly,andthedesignconceptandcraftlevelareconstantlyimproving,whichcanmoresatisfytheneedsofusers.

The characteristics and maintenance ideas of imported CNC machine tools

First,donotblindlybelieveinthequalityofimportedCNCequipment ImportedCNCequipmentismostlytheproductoftoday'smostcutting-edgetechnologyapplications.However,duetotherushofmanufacturers,thereisnotenoughtime-testing,andthereareinevitablysomeimperfectionsindesignandmanufacturing.ThecylinderborehoningmachinepurchasedfromGEHRINGCompanyofGermanyadoptsadvancednumericalcontrolhydraulicservotechnologytobettersolvetheclosed-loopcontrolofthemeshangle,depth,cylinderborediameterandcylindricity.Thecompanyisaworld-renownedcompany,anditsnewlydevelopedlaserhoningtechnologyisbeingtestedattheMercedes-Benzfactory.Itisreportedtobeverysuccessful.However,itistheequipmentproducedbysuchawell-knowncompany.Aftermorethanoneyearofuse,thereareoftensomeunexplainedfailuressuchassuddeninterruptionofoperationandequipmentparking.Sometimesitwillreturntonormalafterrestarting,sometimesitwillbenormalafterrepeatedtimes,sometimesthereisnoproblemforaperiodoftime,sometimesitiscontinuous.Thealarmmessageindicatesa"SYSTEMCOMMUNICATION"systemcommunicationfailure.  ThecharacteristicsandmaintenanceideasofimportedCNCmachinetools Thisphenomenonisgenerallyreferredtoasa"softfault."Atfirst,itwassuspectedthatitwascausedbygridnoiseandharmonicinterference,andthequalityofthegridwastested.Thetestreportshowsthatthegridharmonicsareexceededandfilteringisrecommended.Undernormalcircumstances,theharmonicqualityofthepowergridismostlyexceeded.Gridinterferenceisonlyanexternalcause,andtheoverallanti-interferenceperformanceofthesystemistheinternalcause.MostimportedCNCequipmenthassimplegridnoisefilteringtechnology.Aftermorethanoneyear,theproblemissolved,indicatingthatthesystemcanresistexternalinterference.Nowadays,eithertheexternalinterferencebecomesstrongerorthesystem'santi-jammingperformanceisworse.FromthenormaloperationofotherimportedCNCequipmentinthefactory,itislikelytobeasystemproblem.WhentestingtheGEHA25module,itwasfoundthatthemodulehadobstaclesduringpower-oncommunication,theconnectionspeedwasslow,andtheanti-interferenceperformancewaspoor,butitwasignoredbythehost.Afterreplacinganewmodule,thedevicerunsstablyandthefaultdisappears. Originally,thisCNC-GOPsystemisapatentedproductjointlydevelopedbyGEHRINGandSIEMENS.Ithasstrongspecialfunctions,convenientcontrolandstableperformance.Becauseitisanewlydevelopedsystem,ithasnotpassedsufficienttimetest,andithasanti-interferenceandpoorstability.Infact,therearemanysimilarproblemsinthemanufacturersofequipmentmanufacturingtechnology.Therefore,wecannotblindlyworshipWesternhightechnology.Wemustseethatevenadvancedtechnologiesarestilldeveloping,andtheremaystillbedefects.Themoreadvancedthetechnology,themorelikelyitistobedefective.WhenrepairingimportedCNCequipment,itisnecessarytorecognizeitstechnologicaladvancementandtoseeitsdeficienciesinarealisticmanner. Second,youmustreadthealarminformationanalytically. Thecontrolpartofthenumericalcontrolsystemoftheimportedequipmentisdesignedrigorously.Aseeminglysmallanomalywillalsoreceivethealarmentryandmaycausethemachinetostop.IntheprocessofactuallyrepairingimportedCNCequipment,readingthealarminformationisthemostbasicandconvenientmethodforseekingquickrepair.Butnoteverypieceofinformationiscredible,andeverypieceofinformationcanbeused.Inthenumerousalarmmessages,therearemanythatmaybeuselessorevenmisleadingformaintenance.Itisnecessarytobegoodatextractingfineinformationfromthesemessages. Forexample,theCNCcamgrinderproducedbySCHAUDTinGermanyisaCBNgrindingmachinewithagrindingcamtype.Everytimeyouturniton,therewillbealotofalarms.Infact,theyarealljuststartingup.Therearealotofpreparationconditionsthatarenotsatisfiedyet.Ithasnopracticalsignificance. Once,themachinealarmshowsthatthe"Filterofoildirty"staticpressuresystemfilterisdirty.Theequipmentspindleslideusesstaticpressurefloatingguides.Thefilterwasremovedandcleaned,butitwasstillalarmedafterinstallation;anewfilterwasinstalledandthealarmcouldnotbeeliminated.CarefullycheckthePLCalarmcode,andfindoutthatthefaultalarmconditionisthatthepressuresensorofthestaticpressurefloatingraildoesnotwork.Thefaultdesignexplanationisthatwhenthepressuresensordoesnotsensethepressure,itisunderstoodthatthefilterisblocked.Butbycarefulinspection,thefilterisgood,justbecausethereisaproblemwiththepressuresensor,thesignalissentwithoutsignal. ThegiveninformationofanalarmisobtainedbythedesignerbasedonthePCsimulation.Itisnothisexperienceofon-sitemaintenanceformanyyears.Itisoftendesignedaccordingtotheconventionallogic,withthedesigner'spersonalunderstandingofthesimulationresults.However,theoccurrenceoffaultsisoftenunexpected,oritisnecessarytoreasonandjudgebasedonfaultphenomenaandrandomdata.Thecorrectattitudetothealarminformationprovidedbythemachineis:Donotbelieveit,butnotbelieveit.Donottrustthealarminformation,donotfallintothetrapoffalsealarminformation. Third,afullbackupmustbemadewhenthemachineisfirstused. ImportedCNCequipmentmostlyusesmodernmicroelectronicsnumericalcontroltechnologyandismanagedbyPC.ItshouldbesaidthattheCNCmachinemanagesCNC-PLCandOPsystem,whichgreatlyimprovestheoperationperformanceandmain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Full-featured CNC lathe development trend

Missing structure in the machine tool industry, weak functional components