基于半解析解的拔长与径向锻造快速模拟技术

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1、上海交通大学硕士学位论文theheattransfercharacteristicsandthermalboundaryconditions,discretecontrolequationsforinnerpartanddifferentboundariesinthedeformationzoneareestablished.ThenewmodelisprogrammedandembeddedtosoftwareXFORM.ComparedthedimensionsandtemperaturedistributionspredictedbyXF

2、ORMwiththosebyfiniteelementmethod,theprecisionandtimelineofthenewmodelareverified.Anindustrialexampleofelongatingisanalyzedanditsprocesstechnologyisdesignedbyemployingthenewfastcalculatingtechnic.Accordingtosomeevaluationparameterssuchasthenumberofworkingsteps,dimensionaccur

3、acyandtemperatureevolution,anoptimizedprocessscheduleisselected,whichcanbereferredinengineeringapplicationofelongating.Asemi-analyticalmodelandatemperaturecalculatingmodelareestablishedbasedoncoordinatemapping.Thekinematicallyadmissiblevelocityfieldindeformationzoneisestabli

4、shedbycoordinatetransformationandtheparameterstobedeterminedinthevelocityfieldcanbeobtainedbyupper-boundmethod.Finiteelementmethodisusedtoverifytheproposedmodelandtheresultsshowthenewmodelhassoundprecisiontopredictthedeformation.KEYWORDS:metalhotworking;flowstress;elongating

5、;radicalprogramforgingIV万方数据上海交通大学硕士学位论文目录摘要································································································IABSTRACT·····················································································III第一章绪论·································

6、·····················································11.1背景及意义···············································································11.2国内外研究现状·········································································11.2.1金属流动应力建模研究现状································

7、·····················11.2.2拔长工艺设计及规划······························································41.2.3径向锻造工艺研究进展···························································61.3本文主要研究内容······································································8第二章流动应力曲线建模········

8、····························································92.1引言·········