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《基于剛度與應(yīng)力演變機(jī)制的航空整體結(jié)構(gòu)件加工變形預(yù)測(cè)理論建模.pdf》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、第53卷第9期機(jī)械工程學(xué)報(bào)Vol.53No.92017年5月JOURNALOFMECHANICALENGINEERINGMay2017DOI：10.3901/JME.2017.09.201基于剛度與應(yīng)力演變機(jī)制的航空整體結(jié)構(gòu)件加工*變形預(yù)測(cè)理論建模1,2,31,21,2黃曉明孫杰李劍峰(1.山東大學(xué)機(jī)械工程學(xué)院濟(jì)南250061；2.山東大學(xué)高效潔凈機(jī)械制造教育部重點(diǎn)實(shí)驗(yàn)室濟(jì)南250061；3.濱州學(xué)院機(jī)電工程系濱州256600)摘要：航空整體結(jié)構(gòu)件在銑削過(guò)程中，由于材料去除產(chǎn)生的毛坯初始應(yīng)力重分布和結(jié)構(gòu)剛度演變導(dǎo)致工件發(fā)生加工變形。針對(duì)這一問(wèn)題，借助于生死單元技術(shù)建立隔框件加
2、工變形預(yù)測(cè)有限元模型，獲得材料去除過(guò)程工件變形規(guī)律。基于等效彎曲應(yīng)變能方法，計(jì)算加工過(guò)程工件剛度變化規(guī)律；通過(guò)毛坯初始的應(yīng)力和去除材料產(chǎn)生的彎曲附加應(yīng)力的疊加分析，結(jié)合應(yīng)力-工件剛度演變特點(diǎn)，借助于材料去除產(chǎn)生的附加力矩分析，構(gòu)建航空隔框件加工變形數(shù)學(xué)模型，對(duì)隔框工件加工過(guò)程變形進(jìn)行預(yù)測(cè)分析。將有限元計(jì)算結(jié)果與數(shù)學(xué)解析模型計(jì)算結(jié)果對(duì)比，研究表明兩種方法獲得的加工變形規(guī)律相吻合，工件變形特征與去除材料的初始應(yīng)力狀態(tài)變化規(guī)律相一致。關(guān)鍵詞：等效彎曲應(yīng)變能；剛度演變；殘余應(yīng)力；加工變形；數(shù)學(xué)建模中圖分類號(hào)：TP311MathematicalModelingofAeronautica
3、lMonolithicComponentMachiningDistortionBasedonStiffnessandResidualStressEvolvement1,2,31,21,2HUANGXiaomingSUNJieLIJianfeng(1.SchoolofMechanicalEngineering,ShandongUniversity,Jinan250061;2.KeyLaboratoryofHighEfficiencyandCleanMechanicalManufactureofMOE,ShandongUniversity,Jinan250061;3.Mechat
4、ronicsEngineeringDepartment,BinzhouUniversity,Binzhou256600)Abstract：Aeronauticalmonolithiccomponentwouldbedistortionintheprocessofmillingduetotheinitialresidualstressredistributionandstructuralstiffnessevolutionforthematerialremoval.Inthisresearch,finiteelementmodelingofmachiningdistortion
5、isestablishedbythelifeanddeathtechnology,andthedeformationlawisgotformaterialremoval.Thestructuralstiffnessofaeronauticalmonolithiccomponentiscalculatedbasedontheequivalentbendingstrainenergymethod.Combiningwiththecharacteristicsofresidualstressandstiffnessevolution,machiningadditionaltorqu
6、emodelofmaterialremovalisestablished.Themachiningdistortionoftheframeworkpieceisforecastedbythemachiningdeformationmathematicalmodel.TheresultobtainfromFEMmodelagreeswellwiththatfrommathematicalmodel,andtheresultsshowthatdeformationcharacteristicsandtheinitialstressstateoftheremovingmateria
7、lareconsistent.Keywords：equivalentstrainenergy；stiffnessevolution；residualstress；machiningdeformation；mathematicalmodel題日益突出。航空結(jié)構(gòu)件加工后產(chǎn)生的彎曲、扭轉(zhuǎn)10前言或彎扭組合的整體變形，難以達(dá)到設(shè)計(jì)要求，嚴(yán)重[1-2]影響了產(chǎn)品的生產(chǎn)效率與加工成本。因此，需要隨著現(xiàn)代航空航天飛行器性能要求的不斷提系統(tǒng)研究航空整體結(jié)構(gòu)件加工變形機(jī)理及變形預(yù)測(cè)高，對(duì)航空整體結(jié)構(gòu)件的高精度制造提出了更
