型材辊轮式模具头体多点拉弯成形技术研究.pdf

具，应力应变分布越均匀，成形质量越好。对于辊轮式模具头体多点三维成形，应该选

用每个模具头体不同的模具组合，选择与型材接触面积大的模具型面。对优化形状和

型面的模具进行试验，试验结果与有限元仿真结果有较高的吻合度。

对辊轮式模具头体多点拉弯中模具头体数量、预拉伸量、补拉伸量与摩擦系数对

成形精度的影响，进行了正交试验分析。利用正交试验的结果，确定了最优的工艺参数

组合，进行试验验证其有效性。试验结果表明：对于6米长的制件，各工艺参数对成形

精度影响的主次顺序为：模具头体数量预拉伸量补拉伸量摩擦系数。最优水

平试验组合为模具头体数量为20个，预拉伸量为0.6%，补拉伸量为0.6%，摩擦系数

为0.1。

关键词：

多点拉弯，有限元模拟，离散化，厚向应变，局部变形

ResearchonMulti-point3DStretchBendingTechnology

ofRoller-typeDie

Abstract

Atpresent,3Daluminumalloyprofilesarewidelyusedintransportationfieldssuchas

automobiles,railtransit,andairplanes.Thedemandfor3Dstretch-bentpartsinother

manufacturingfieldsisalsoincreasing.However,mostofthestretch-bendingforming

technologyalsousetraditionalintegraldies,whichcanonlybeusedfor2Dforming.For3D

deformedparts,itisnecessarytoperformplanedeformationfirst,andthenperformtorsional

deformationunderunloadedstate.Roller-typediebodymulti-pointstretch-bendingforming

technologycombinesstretch-bendingandmulti-pointformingideas.Itcanstretchandbend

theprofileindifferentdimensionswithoutunloadingtoform3Dpartsatonetime.Inthe

processofmulti-point3Dstretch-bendingformingoftheroller-typedie,therearecontactand

non-contactareasbetweentheprofileandthediepartduetothediscreteofthedie,andthe

profileandthediearenotfullybonded.Theshapeandsurfaceoftheroller-typediewillaffect

thestressandstraindistributionoftheformedpartandtheformingaccuracy.Atpresent,the

researchonthemulti-pointstretch-bendingpartsoftheroller-typedieseldominvolvesthe

influenceofthedieonthestressandstrainofthepart.

Themainresearchcontentsandconclusionsofthispaperareasfollows：

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