机械专业中英文文献翻译普通全钢冲模的冲压精度分析Word文件下载.docx
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机械专业中英文文献翻译普通全钢冲模的冲压精度分析Word文件下载.docx
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Fortheanalyseofpracyicableinaccuracyduringproductionofdiestoinactivation,wecouldgetthetendencywhenitisaugmentationinmosttime.Fromthiswecouldanalysetheelements.Whenthenewpunchdiesptintoproductiontothefirstcuttergrinding,theinaccuracyproducedcalledinitialerror;
ifthediegrindingmorethantwentytimes,untilit’sdiscard,theinaccuracycalledconventionalerror;
andbeforethediesdiscard,thelargesterrorofthelastbatchpermit,calledlimitingerror.atjobsite,theevidencetoconfirmlifeofsharpeningisthehigheroftheblanking,punchedholeorpunchedparts.Becauseallfinishedpartshadbeenblanked,soitisespeciallyforthecompounddies.Therefore,theanalyseofburrandmeasurementisespeciallyimportantwhendothemasenterprisestandardizationorcheckedwith<
<
theheightofpunchingpart>
>
.
Theinitialerrorusuallyistheminimalthroughthewholelifeofdie.Itsmagnitudedependontheaccuracyofmanufacture,quality,measureofthepunchingpart,thicknessofpanel,magnitudeofgapanddegreeofhomogeneity.Theaccuracyofmanufacturedependonthemanufactureprocess.Forthe1mmthickedcompoundpunchingpartmadeinmediumsteel,theexperimentalresultandproductivepracticeallprovethattheburrofdieswhichproducedbysparkcuttingarehigher25%~~30%thanproducedbygrinder,NCorCNC.ThereasonisthatnotonlythelatterhavemoreexactmachiningaccuracybutalsothevalueofroughnessRaislessoneorderthantheformmer,itcanbereached0.025μm.Therefore,thedie’sinitialblankedaccuracydependsontheaccuracyofmanufacture,qualityandsoon.
Thenormalerrorofthepunchdieisthepracticableerrorwhenthefistcuttergrindingandthelastcuttergrindingbeforethedieproducethelastqualifiedproduct.Astheincreaseofcuttergrinding,causedthemeasurethenaturewearofthediesaregradualincreasing,theerrorofpunchingpartincreasealso,sothepartsareblewproof.Andthediewillbeunused.Theholeonthepartandinnerbecausethemeasureofwearwillbesmallandsmallgradually,anditsoutsideformwillbelagerinthesamereason.Therefore,theholeandinnerforminthepartwillbemademouldaccordingtoone-waypositivedeviationornearlyequaltothelimitmaxmeasure.Inlikemanner,thepunchingpart’sappearancewillbemademouldaccordingtoone-waynegativedeviationornearlyequaltolimitminimeasure.Forthiswillbebroadenthenormalerror,andthecuttergrindingtimeswillbeincreased,thelifewillbelong.
Thelimiterrorinpunchingpartsarethemaxdimensionerrorwhichpracticableallowedinthepartswithlimiterror.Thiskindofpartsusuallyarethelastqualifiedproductsbeforethediediscard.
Fortheallclassesofdies,ifweanalysethefluctuate,tendencyofincreaseanddecreaseandlawwhichappearedinthedie’swholelife,wewillfindthatthemasteroftheerrorarechangeless;
theerrorthatbecausetheabradeofthecutterandimpressionwillbeasthecuttergrindingtimesincreasedatthesametime.Andthatwillcausetheerroroversizegradually;
andalsohaveanotherparterrorareunconventional,unforeseen.Therefore,everydie’serrorarecomposedoffixederror,systemerror,accidenterrorandsoon.
1.fixederror
AtthewholeprocesswhentheNewpunchingdiebetweenjustinputproductiontodiscard,thechangelessmastererrorthatinqualifiedpartarecalledfixederror.It’smagnitudeisthedeviationwhenthedieproductionqualifiedproductsbeforethefirstcuttergrinding.Alsoistheinitialerror,butthediehaveinitialpunchingaccuracyatthistime.Becauseoftheabradeofparts,thedieaftergrindingwillbechangethedimensionerror.Andtheincrementofdeviationwilloversizeasthetimesofcuttergrinding.Sothepunchingaccuracyaftercuttergrindingalsocalled“grindingaccuracy”andlowertaninitialaccuracy.Thefixederrordependontheelementsfactorasfollowed:
(1)thematerial,sorts,structure,(form)dimension,andthickofpanel
themagnitudeofpunchinggapanddegreeofhomogeneityarehaveaimportanteffectforthedimensionaccuracy.Differentpunchingprocess,material,thickofpanel,havecompletelydifferentgapandpunchingaccuracy.AgearH62whichmadeinyellowbrasswiththesamemodenumberm=0.34,2mmthickandhadacenterhole,whenthegapgetC=0.5%t(singleedge),andpunchedwithcompoundpunchingdie,andthedimensionaccuracyreachedIT7,theparthaveaflatsurface,theverticalityoftangentplanereached89.5°
itsroughnessRamagnitudeare12.5μm,heightofburrare0.10mm;
andthepunchingpartarepunchedwithprogressivedie,thegapC=7%t(singleedge),initialaccuracyareIT11,andhaveanmoreroughsurface,evencanseethegapwitheyes.Intheusualsituation,flushesamaterialanditsthicknesstistheselectionpunchinggapmainbasis.Oncethedesignationgaphaddeterminedflushestheplanesizethefixederrormainbody;
Flushesthestructurerigidityandthethree-dimensionalshapeaffectsitsshapepositionprecision.
(2)punchingcraftandmolderstructuretype
Usesthedifferentrammingcraft,flushesaprecisionandthefixederrordifferenceisreallybig.Exceptthattheabovepiecegearexampleshowed,theessenceflushesthecraftandordinarypunchingflushesaprecisionandthefixederrordiffersoutsideamagnitude,evenifinordinarypunchingcenter,usesthedifferentgappunching,thefixederrordifferenceveryisalsobig.Forexamplematerialthickt=1.5mmH62brasspunching,selectsC<
=the40%tunilateralIkindofsmallgappunchingcomparedtoselectC<
=8%t(unilaterally)IIIkindofbiggappunching,willflushafixederrortoenlarge40%~60%,theprecisionatleastwillfallalevel.Sideinaddition,whetherthereispicksbuildsarowoftypeside,flushesaerrortohavefartobebiggerthanhasbuildsarowoftypetoflush.Sidenotbuildsarowoftypetoflush.SidenotbuildsarowoftypetoflushaprecisiontobelowerthantheIT12levelside,butmosthasbuildsarowoftypetoflushaprecisioninIT11between~IT9level,materialthickt>
4mmflushes,thesizeprecisioncanlowersome.Differentdie’sstructuretype,becauseissuitabletherammingmaterialtobethickandthemanufactureprecisiondifference,causestoflushafixederrortohaveleaves.Compounddiecenter,multi-locationscontinuoustypecompounddiebecauseflushescontinuouslytoduplicatethelocalizationtoaddonthepatternmakingerrortobebigger,thereforeitflushesafixederrorcompoundpunchingdietowantcomparedtothesinglelocationBig1~2levels
(3)thecraftofpunchingdie’smanufacture
themainworkofpunchingdienamelyareraised,theconcavemoldprocessingprocedure,tooperatesonthespecificationnottobehigh,cantimeformamorecomplexcavity.Butitsprocessingsurfaceapproximatelyisthick>
0.03~0.05mmisthehightemperatureablationremainingfurcatedausteniteorganization,degreeofhardnessmayreachashighasHRC67~70,hasthemicrocrack,easilywhenpunchingappearsbrokethecutterorflaking.TheItalianCorradaCorporation'
'
srelatedmemoircalled"
thelinecuttheprocessingcontructiontohavethedisadvantageousinfluencetothesuperficialgold,infactalreadychangedthegoldcontruction.WemustusetheJin'
gangstonepowdertogrindorthenumericalcontrolcontinualpathcoordinatesrubtruncate(cuttoline)tomaketheprecisionwork"
.InrecentyearscountryandsoonSwitzerlandandJapan,hasconductedthethoroughresearchtotheelectricalfinishingequipmentandabiggerimprovement,makesfunctioncompletehighaccuracyNCandtheCNClinecutter,theprocessingprecisionmayreach±
0.005~0.001mm,evenissmaller.TheprocessingsurfaceroughnessRavaluecanachieve0.4mum.Accordingtotherecentyearstothedomestic12productionlinescutterfactoryinvestigationandstudy,thedomesticallyproducedlinecutterprocessingprecisiondifferentfactorydifferentmodellinecuttermightreach±
0.008~±
0.005mm,generallyallin±
0.01mmorbiggersomewhat,wasindividualalsocanachieve±
0.005mm,theprocessingsurfaceroughnessRavaluewasbiggerthan1.6μm.However,theelectricalfinishingablationmetalsurfacethusthechangeandthedamagemachinedsurfacementalstructurecharactercannotchange,onlyifwithrubstruncatesorotherwaysremovesthisharmfullevel.Therefore,merelyuseselectricitymachining,includingthesparkcuttingandtheelectricityperforation,achieveswithdifficultypunching,especiallyhighaccuracy,highlifepunchingdietosizeprecisionandworkcomponentssurfaceroughnessRavaluerequest.
Withpreciselyrubstruncatesthelawmanufacturepunchingdie,speciallymakesthehighaccuracy,thehighlifepunchingdie,suchas:
Thinmaterialsmallgapcompoundpunchingdie,multi-locationscontinuoustypecompounddieandsoon,hasthesizeprecisionhigh,theworkcomponentsmachinedsurfaceroughnessRavalueissmall,themoldlifehighercharacteristic.Itsprocessingcraftatpresentchangedtheelectricalfirebythepastordinaryenginebedroughmachiningsparkcuttingortheelectricitypuncherroughmachining,finallypreciselyrubstruncates,alsofromtakesshaperubs,opticscurverubs,themanualgridreferencerubsgraduallyfiltersthecontinualpathgrid
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