TC4钛合金锥形环辗轧整圆曲线设计及其影响规律.pdf

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1、第50卷第l4期机械工程学报V01．50NO．142014年7月JOURNALOFMECHANICALENGINEERINGJu1．2O14DoI：1O．3901／JME．2014．14．126TC4钛合金锥形环辗轧整圆曲线设计及其影响规律水郭良刚陈孝庆杨合陈建华邸伟佳(西北工业大学凝固技术国家重点实验室西安710072)摘要：TC4钛合金锥形环辗轧过程整圆阶段的芯辊进给速度曲线形式，对成形环件的几何(圆度、壁厚均匀性)、温度与应变分布等具有重要影响作用。针对同一TC4钛合金锥形环件热辗轧过程，提出“上凸形”、“下凹形”、“阶梯形”和“直线形”四种整圆芯辊进给速度曲线(整圆曲线)

2、的设计方法；进而采用基于ABAQUS软件平台的建模仿真方法，模拟揭示四种整圆曲线对成形环件圆度、壁厚均匀性以及温度与应变场的影响规律。结果表明，“上凸形”、“直线形”、“阶梯形”、“下凹形”整圆曲线下，成形环件圆度及壁厚均匀性依次变好；成形环件平均温度依次变低，温度分布均匀性依次变好；平均等效塑性应变依次变大，等效塑性应变分布均匀性依次变差。综合考虑环件圆度、壁厚均匀性以及温度与应变情况，“下凹形”整圆曲线相对更适合于TC4钛合金锥形环辗轧过程。关键词：TC4钛合金；锥形环；环件轧制；芯辊进给速度曲线；整圆曲线；有限元建模仿真中图分类号：TG33DesignMethodofCal

3、ibratingCurveandItsEffectsonConicalRingRollingProcessforTC4TitaniumAlloyGUOLianggangCHENXiaoqingYANGHeCHENJianhuaDIWeijia(StateKeyLaboratoryofSolidificationProcessing，NorthwestemPolytechnicalUniversity,Xi’an710072)Abstract：Thefeedspeedcurveofthemandrelattheendstageoftheconicalringrollingproce

4、ssforTC4titaniumalloy(calibratingcurve)playsanimportantroleinthegeometricaccuracy,temperatureandstrainfieldsoftherolledring．Designmethodsforfourkindsofcalibratingcurveswhichareconvex，concave，ladder,andlinearformsareproposed．Theefectrulesoffourcalibratingcurvesonroundness，thicknessuniformityan

5、dtemperatureandstainfieldsoftherolledringareexploredthroughnumbersofsimulationsbasedonABAQUSsoftwareplatform．Theresultsshowthat，undertheconvex，linear,ladderandconcavecalibratingcurves，theroundnessandthicknessuniformityoftherolledringorderlytendtobebetter；thetemperaturedistributionoftherolledr

6、ingorderlybecomesmorehomogeneousbutthetemperatureaverageisorderlydecreasing；andtheequivalentplasticstraindistributionorderlybecomesmoreinhomogeneousbuttheaverageofequivalentplasticstrainisorderlyincreasing．Sotheconcavecalibratingcurveistherelativelyadequateselectionamongtheabovefourcalibratin

7、gcurvesfortheconicalringrollingprocessforTC4titaniumalloybillets．Keywords：TC4titaniumalloy；conicalringparts；ringrolling：feedspeedcurveoftheman&el；calibratingcurve；finiteelement(FE)modelingandsimulation件J。环件辗轧是一种先进的连续局部回转塑性成0前言形技术，它通过轧环机使环坯产生壁