wire drawing大中拉培训教材

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1、WiredrawingVermeulenDirkR#KLPAA/06/197BasicprincipleToreducethediameterofthewire:!thevolume(mass)ofthewireremainsthelengthincreasesthediameterisreducedV0=V1V0V1d0d1L0L1FlowofthematerialhowThedeformationisdoneinadieHerethereisthedeformationbutalsofrictionpo

2、werForcepowerAllusedpowerisconvertedinto:90to95%tothedeformationofthewire=heat10to5%inresidualstressesAdrawingmachineishugeheatexchangerCoolingisthenameofthegameDeformationInhomogeneousdeformation,shearloss,redundantwork2FrictionlossµcontactlengthHo

3、mogenousdeformationreductionDeformationInhomogeneousdeformation,shearloss,redundantwork2Drawingforcegraph..PDFboekjeRVdraadtrekken.pdfmorepowerTohavesufficientforcetodrawthewirethroughthedieweneedPOWERPower:comesfromelectricmotorHowmuchpower???Depe

4、ndson:Amountofdeformation(=reductionorelongation)5.5to4.75versus5.5to5.00mmStrengthofthewireHICA(0.80%C)versusLOCA(0.05%C)Speed1m/secversus20m/secFrictioninthedie(lubricant,coatingdieangle..)exampleswirerod5.5mmdrawnto4.75mm@2m/secLOCA(0.10%C)needs:8.5kWHI

5、CA(0.80%C)needs:22.5kWWire2.00mmdrawnto1.80@20m/secLOCA(0.10%C)needs:16.7kWHICA(0.50%C)needs:31.9kWpower9kW??=power32kW=powerDrawing2mmLOCAfrom6.5mm@15m/sec(=54km/hor34Miles/hourneeds:175kWnetor235HorsepowerMasteringthedrawingprocessIsmasteringthewi

6、retemperaturesinceatoohighwiretemperaturedestroysthelubricantfilmandthewirepropertiesWiretemperature2.Deformationtemperature(homogeneous+redundant)-%reduction-dieangle-%Carbonandtensile3.frictiontemperature-Contactlength(dieangle–bearinglength)-lubrican

7、t,coating-speedTemperatureofthewirebeforethedie=coolingofthewireonthepreviouspassThetemperatureofthewireafterthedieisthesumof1.Coolingonthecapstan²Temptop:<80°C(176°F)Tempbottom<160°C(320°F)diebox5%ofthewireheatGoestothediecooling60to70%ofthewireheatGoest

8、hecapstancooling10to15%ofthewireheatGoestotheair<10%ofthewireheatGoeswiththewiretothenextpass1.Coolingonthecapstan1.TemperaturemeasurementTemperaturestobemeasuredwithIRtemperaturemeterwaterflowt