机械设计外文翻译7237265.docx
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机械设计外文翻译7237265.docx
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机械设计外文翻译7237265
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FORMABILITY,FLOWANDHEATTRANSFER
SIMULATIONOFHOTPRESSFORMINGB-PILLAR
PARTANDTOOLS
MyungKiPark,HyunSungSon,TaiHoKimandByungKeunChoi
AutomotiveSteelApplicationsResearchGroup,POSCOTechnicalResearchLaboratories
Abstract.Theapplicationofthethediesandlowspringback.Majortechnologiestodevelopanddiecoolingsystemdesign.Inthispaper,theformingsimulationusingcoupled
thermo-mechanicalanalysisfordicefacedesignandflow,fordiecoolingsystemdesignofB-
pillarareperformed.MassproductiontoolsofB-pillararemadeanddimensionalaccuracyandresultsof,Flowsimulation,Heattransfersimulation
PACS:
02.60.Cb
INTRODUCTION
Inrecentyearsadvanced-theautomotiveindustry
becauseofweightreductionandimprovementincrashworthiness.Whenformingadvanced-increaseinstrengthusuallyleadstosomeproblemssuchasreducedformabilityandtendencyto
springback.Toproduce
otherliteratures)developedandapplied.Duringbeproduced.Thepartproducedbyotherdies.
Fortherapiddevelopmentofbe
avoidedbyusingfiniteelementsimulationsonthemanufacturingprocess.Afiniteelementsimulationofthe
formingprocessandrapidcoolingindiesshouldconsiderthethermal-mechanicalcontactbetweenthetoolandthe
sheetmetaltoobtainaccuratepredictionsoftemperaturedistribution,coolingrate,stressesandstrains.
Severalresearchersfor.Altan[1]
reviewedtheformingandcoolingsimulationfor[1],aninsufficientcooling
ratebecauseofpoortooldesigncanbepredictedandcorrectedusingfiniteelementsimulation.Besidestemperature
distribution,thermalfiniteelementsimulationalsocanbeusedtopredictthecycletimerequiredtocoolaparttoa
certaintemperaturewhenapartcanbesafelywithdrawnfromthedie.Thus,acontrolledandoptimizedbedevelopedwithfiniteelementsimulations[2].Andsomeresearchersonwarmandforwarmformingprocessof
magnesiumoraluminiumalloysheet.
Inthispaper,forming,refrigerantflowandcooling
simulations.Fordiefacedesign,formingsimulationwasdoneusing
steel.Forcoolingsystemdesignindies,wecarriedoutflowsimulationtoestimatewaterflowincooling)
344
toestimatepartejectingtemperatureduringcontinuousoperation.Somesimulationresults
werecomparedwithexperimentaldata.
COUPLEDTHERMO-MECHANICALFORMINGSIMULATION
Theblankintheatemperaturerangebetween600℃and800℃.
Forafiniteelementformingsimulation,thermo-mechanicalmaterialcharacteristicsoftheofthematerial’sflowstressindependencyofthetemperatureandthestrainrate
between630°Cand780°Cinarangeofstrainrate(0.002sto1s)byausteniticstateourotherpaper[6].Son[6]investigatedtheinfluenceoftemperatures
andstrainratesontheflowpropertiesofthetestmaterialandfoundthatthetemperature
theformingbehaviorofaboronsteel.Increasingthetemperatureleadstoasignificantreductionoftheflowstress
andadecreasingworkaremarkabledecreaseoftheslopeofthetruestress-strain
curves.Itwasalsofoundthatthestrainratetheformingbehavioroftheboronsteel.
Increasingthestrainrateleadstoappreciableincreaseofthestresslevelandtheslopeofthecurve.Tousetheflow
curvesinthesimulationbyLS-DYNA,theflowcurveswereexpressedasaCowper-Symondsmodelusing
experimentaldataandassumedbyextrapolationatotherstrainrates.
B-pillarformingprocesswassimulatedwithcoupledthermo-mechanicalformingsimulationandproducedwith
masstoolasshowninFig.1.LS-DYNA,theexplicitdynamicFEMcode,wasusedforformingsimulation.In
formingsimulation,shellelementswereusedfortoolsandablankandtheelementsizeofablankwas2mm.
Thermalandmechanicalcontactsweredefinedusing‘contact_surface_to_surface_thermal’card.
Inthicknesscoldrolledsheetwasandthenplacedonthebinderin12sec.Theformingtimewasabout2sec.Attheupper
diemoveddowntocontacttotheblank,thetemperatureofablankwasabout750℃andtheblankwasrapidcooled
inthediesforabout20seconds,afteranupperdiereachedatthebottomposition.Thethinningdistributionandthe
straindistributiononaFLDatthefinalstateofformingsimulationareshowninFig.2.Itisseenthatmaximum
thinningaregionAandmaximumthickeningaregionB.Simulationresultswellpredicted
experimentalresultsasshowninparenthesisforthinningatseveralpositionsofaover50points.Coordinatemeasurementmachinewasusedtocheckshapeprecision.
Almosteveryshapepresicioncheckpointofpartmeetthestandardbeforeshotblastprocess.
FIGURE1.Toolset-uppositionand3DmasstoolmodelofB-pillar
FIGURE2.Thinningandstraindistributionatthefinalstage
345
FLOWANDHEATTRANSFERSIMULATION
Inatemperaturerangebetween600℃and800℃andrapid
cooledindiestoachieveofthe
formingpartduringcontinuousoperation,theof
mechanicalpropertiesintheformedpart.
Generallythediesforandtheinterferenceofcoolingorblank
guidepin.Whenthecoolingthatwithcoolingthispaper,diecoolingsystemwas
designedwith3Dmodelingtoolandflowandwasperformed
withFLUENTandwasperformedwithLS-DYNA.
Figure3showsthecoolingofmechanicalpropertiesintheformedpart,wesetalimitonthemaximumnumberofcooling
modelingtheB-pillarcoolingresultsforrefrigerantflowandtemperationdistributionofthe
toolatthetimeof20secondsafterupperdiereachedatthebottompositionduringcontinuousoperation.Part
ejectingtemperatureofwasalsoshowninFig.4.Theinletflowrate
isabout60literperminute.Flowsimulationisusedtodeterminethecoefficientofcooling.Theinterfaceandpartejectingtemperationunderserialproduction
346
FIGURE5.HardnessMeasuringpointoftheatthesurfaceoftheatthesurfaceofthethatthe45HrC(TS≈1500MPa)ateverychekingpointasexpectedfrom
the.Accordingtothesimulationresult,thecoolingrateoftheblankwasoverthan30°Csec,
thusverybeexpectedfromCCTcurveoftheboronsteel.
CONCLUSION
Inthispaper,rateandtemperaturewere
usedforformingsimulation.Whenmodelingthecoolingwereusedforevaluatetheefficiencyofcooling
systemandestimatepartejectingtemperatureduringcontinuousoperation.Somesimulationresultswerecompared
withrealpart.
REFERENCES
1.
T.Altan:
“Hot-stampingboron-alloyedsteelsforautomotiveparts,PartIII:
Tooldesignandprocesssimulation,”Stamping
Journal(2007)
2.
H.Engels:
"ControllingandMonitoringoftheHot-StampingProcessofBoron-AlloyedHeat-TreatedSteels,";in
proceedingsfromTheInternationalConference"NewDevelopmentinSheetMetalFormingTechnology,"Stuttgart,
3.
Yoshihara,S.,MacDonald,B.J.,Nishimura,H.,Yamamoto,H,Manabe,K.:
Optimisationofmagnesiumalloystampingwith
local,T.:
Finiteelementsimulationofmagnesiumalloysheetformingatelevatedtemperatures.
J.Mater.Proc.Tech.,146:
52-60,2004.
5.
Takuda,H.,Mori,K.,Masuda,I.,Abe,Y.,andMatsuo,M.:
Finiteelementsimulationofwarmdeepdrawingofaluminium
6.
H.S.Son:
“Formabilityevaluationforhotpressformedpartusingcoupledthermo-mechanicalanalysis,”Numisheet2008
347
毕业论文通用格式分类号:
无锡职业技术学院
毕业设计(论文)
题目(团队课题要注明“团队”二字)
英文并列题目
所在团队
答辩委员会主任主答辩人
二零15年3月
毕业设计(论文)开题报告
毕业设计(论文)任务书
年月日
设计类建议格式一:
封面
开题报告
任务书
摘要、关键词(含中英文)
第一章序言
1.1XXX
1.2XXX
……
第二章XXX工艺设计
2.1XXX
2.2XXX
……
第三章XXX参数确定及计算
3.1XXX
3.2XXX
……
第四章XXX夹具设计
4.1XXX
4.2XXX
……
第N-1章XXX
N-1.1XXX
N-1.2XXX
……
第N章结论
小结与致谢
参考文献
毕业设计附录目录:
1.机械加工工艺流程图
2.机械加工工艺过程卡
3.机械加工工艺工艺卡
4.机械加工工艺工序卡
5.被加工零件图
6.夹具装配图
7.夹具零件图
8.其他系统图
9.其他原理图
10.零件三维造型图
11.夹具三维造型图
12.设计(作品)实物图
13.设计(作品)实物
14.开题报告
15.专业翻译材料
16.企业证明
17.与企业合作开发的技术服务合同
18.四技服务项目验收表
19.毕业设计(论文)指导记录表
20.毕业答辩评审表
表2毕业设计(论文)评阅教师评价表
表3毕业设计(论文)答辩记录表
表4毕业设计(论文)答辩评价表
表4毕业设计(论文)综合评价表
设计类建议格式二:
封面
开题报告
任务书
摘要、关键词(含中英文)
第一章绪论
1.1XXX课题的背景及意义
1.2XXX国内外研究现状
1.3XXX技术特点
1.4XXX课题研究的内容
……
第二章XXX系统的总体设计
2.1XXX系统整体方案设计思路
2.2XXX
……
第三章XXX系统的硬件设计
3.1XXX系统硬件设计思路
3.2XXX
……
第四章XXX系统的电路设计
4.1XXX系统电路设计思路
4.2XXX
……
第五章XXX系统的软件设计
5.1XXX系统软件设计思路
5.2XXX
……
第六章XXX系统的监控中心设计
6.1XXX系统监控中心设计思路
6.2XXX
……
第N-1章XXX
N-1.1XXX
N-1.2XXX
……
第N章总结与展望
小结并致谢
参考文献
毕业设计附录目录:
1.XXX系统的总体设计图
2.XXX系统的硬件设计图
3.XXX系统的电路设计图
4.XXX系统的软件设计方框图
5.软件光盘
6.其他系统图
7.其他原理图
8.设计(作品)实物图
9.设计(作品)实物
10.开题报告
11.专业翻译材料
12.企业证明
13.与企业合作开发的技术服务合同
14.四技服务项目验收表
15.毕业设计(论文)指导记录表
16.毕业答辩评审表
表2毕业设计(论文)评阅教师评价表
表3毕业设计(论文)答辩记录表
表4毕业设计(论文)答辩评价表
表4毕业设计(论文)综合评价表
论文版面格式:
无锡市机电五金行业市场调查
(三号、宋体、加粗、居中、1.5倍行距)
摘要:
(小五号,黑体)无锡位于长三角地区,近年来机电五金行业发展迅猛。
通过对无锡机电五金市场的调查,从调查目的、调查对象、调查范围、调查方式、调查内容等方面,大致了解了无锡机电五金行业的市场经营的现状、从业人员的现状以及电子商务应用的情况。
(小五号、楷体、单倍行距)
关键词:
(小五号,黑体)机电五金行业;市场调查;无锡市(小五号、楷体、单倍行距、分号相隔)
MarketresearchonWuxielectromechanical”体)
Abstract:
(加粗)Havenotintolocatetogrowtriangleregion,themachinegivesorgetsanelectricshockadevelopmentinrecentyearsfastfierce.Passtheinquisitionthattherightnessmachineelectricitymachineelectricityofthemarketconductofpresentconditionandtheappliedcircumstanceoftheelectroniccommerceofpresentcondition,employee.(小五号、TimesNewRoman、单倍行距)
Keywords:
(加粗)Themachineelectricity,Marketresearch,WuxiCity(小五号、TimesNewRoman、单倍行距、英文分号相隔)
一、绪论
(标题1:
无缩进、三号、黑体、1.5倍行距;日语为“明朝体”,英语等外语用“TimesNewRoman”体)
(一)调查目的
(标题2:
首行缩进2字符、小四号、黑体、1.5倍行距;日语为“明朝体”,英语等外语用“TimesNewRoman”体)
受无锡市机电五金行业协会委托,无锡职业技术学院经济管理系于2007年对五金市场经营环境进行了调查。
通过这次调查主要是为了更好的了解该地区的机电五金的市场格局,主要销售的产品,市场的经营状况及产品的
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