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《彈簧數(shù)控卷繞成形與回彈數(shù)值分析-(5836)》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、摘要II萬方數(shù)據(jù)ABSTRACTABSTRACTDuetotheCNCspringcoilingmachinehashigherproductionefficiencyandthedegreeofautomation,moreover,itcanberolledoutthespecial-shapedspringseasily.therefore,ithasbeenappliedwidelyinmainspringmanufacturingenterprisesindomestic.Butbecausethev
2、ariousfactorssuchasmodelparameters,technologyparametersandmaterialpropertiesinfluenceeachotherintheprocessofCNCspringcoiling,italsoneedsalotofprevioustestworkfordifferentspringintheactualproductiontodetermineprocessingtechnology.Itnotonlyprolongstheproductio
3、ncycleandincreasestheproductioncost,butalsoisdifficulttoguaranteetheformingquality.Atthesametime,itoftencausesthephenomenonsuchassquashspringwire,insufficientstretchedoutlengthandlargefluctuationofformingspeedowingtothereductionofrolleristoobigortoosmall.Iti
4、mpactstheproductionefficiencyandqualityofspringseriously.Therefore,itisthekeytoimprovethequalityofspringformingandrealizethefurtherdevelopmentofspringCNCcoilingformingtechnologytoresearchtheelastic-plasticbendingformingprocessofthespringandanalysetheinfluenc
5、eruleofspringformingandspring-backaboutmodelandtechnologyparametersbyadoptingthemethodofnumericalanalysisandthefiniteelementsoftware.Focusingontheseproblems,themotionandmechanicalanalysisaremadeinthedeformationprocessofspringwireandthemathematicalmodelofspri
6、ngspatialbend-formingisestablishedbasedonthecharacteristicsofspringCNCcoilingforming.Atthesametime,themathematicalexpressionsofbendingradiusofspringwire,speedofspringwirefeedandspaceinstallationangleofrollerandpushrodandthetheoreticalmodelofdynamiccontrolthe
7、reductionofrollerandthetractionofspringwirearederived.Itprovidesanewcontrolmethodtoimprovethequalityofspringforming.ThefiniteelementanalysismodelofspringCNCcoilingformingisestablishedbyusingtheANSYS/LS-DYNAsoftwarebasedonthedynamicexplicitandimplicitstatican
8、alysismethodofelastic-plasticfiniteelementandthenumericalsimulationofspringCNCcoilingformingandspring-backisrealized.Theroleofchangingovertimeaboutunitstressintheprocessofspringformingandspring-
