Intheprocessofwirecutting,howtoensurethequalityofwirecuttingisaveryimportantissueinmoldprocessing.Ingeneral,payattentiontothefollowingaspectswhencuttingonline:(1)Selecttheappropriatemoldmaterial Wirecuttingisgenerallyperformedaftertheblankishardened.IfcarbontoolsteelssuchasT8AandT10Aareused,itisdifficulttohardenandthehardenedlayerisshallow.Afteruse,thehardenedlayermaybewornawayandthehardnessDecreasedsignificantly.Inordertoimprovetheservicelifeandmachiningaccuracyofwirecuttingmolds,alloytoolsteelsorhardalloyswithgoodhardenabilityshouldbeused.Thehardnessofthesematerialsfromthesurfacelayertothecenterisnotsignificantlyreduced.(2)Improvetheaccuracyofmechanicaltransmission Theaccuracyofmechanicaltransmissionhasagreatinfluenceonthemachiningaccuracy.Thedisplacementaccuracyofthetableandthemovementaccuracyoftheelectrodewiredirectlyaffectthemachiningaccuracy.Sincethemovementofthetableisdrivenbymultipletransmissionpairs,suchasgearpairs,screwnutpairs,etc.,theirtransmissionaccuracydirectlyaffectsthemachiningaccuracy.Themovementaccuracyoftheelectrodewireisalsogreatlyaffectedbytherotationaccuracyoftheguidewheel,unevenwearoftheguidewheel,andslackoftheelectrodewire.Itcanbeseenthatthelowprecisionofthemechanicaltransmissionhasagreatimpactontheprocessingquality.(3)Reductionofresidualstress Whenwirecuttingisused,largepiecesofmetalwillbecutoff,therelativeequilibriumstateoftheinternalresidualstressofthematerialwillbedestroyed,andthestresswillberedistributed.Theresidualstressinthematerialissometimesmoreseriousthanthemachineprecisionandotherfactorsonthemachiningaccuracy,whichcanmakethedeformationvisibletothemacro,andeventhematerialwillbreakduringthecuttingprocess.Inordertoreducethedeformationcausedbyresidualstress,correspondingmeasuresshouldbetaken,suchascorrectselectionofheattreatmentspecifications;thecontouroftheworkpieceshouldbe8-100mmawayfromtheedgeoftheblank;agingtreatmentcanbeperformedbeforeonlinecutting;pre-processingbeforequenchingtoremovemostMargin;whenwirecutting,usethesecondarycuttingmethod,roughcuttheholeforthefirsttime,andfinecuttheholewhenthestressreachesanewbalance;choosethecorrectcuttingsequence,etc.Theabovemeasuresareofgreatbenefittoreducetheresidualstressinthematerial.(4)Reducesurfaceroughness Thesurfaceroughnessofthemoldcavityhasagreatimpactonthequalityoftheplasticpart,andweshouldtrytoreducethesurfaceroughnesswhencutting.Tothisend,relevantmeasuresshouldbetaken.Iftheelectrodewireisnottightenough,itshouldbetightenedatanytime;thefeedspeedshouldbeadjustedappropriatelytoavoidspeedfluctuations;toolargeamechanicaltransmissiongapcaneasilycausetheelectrodewiretoshakeandincreasetheroughness.Forthisreason,itisnecessarytoadjustthetightnessofeachmechanicaltransmissionpartintime;correctlyselecttheelectricalparameterstoavoidthesinglepulsebeingtoolarge.Inaddition,thewirefeedspeedistoofastorjitteroccurs,whichwillalsoaffectthesurfaceroughnessofthepart.Theyarealldetrimentaltoqualityimprovement.
How to ensure the quality of wire cutting
How to ensure the quality of wire cutting
