毕设英语翻译文档格式.docx

毕设英语翻译文档格式.docx

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AstudyonthedevelopmentofcentercarriertypeprogressivedieforU-bendingpartprocess

用于U形零件弯曲加工的中间载体级进模研发过程的研究

院系航空航天工程学部

专业飞行器制造工程（钣金与模具）

班级94030203

学号2009*******77

姓名成骏

指导教师刘占军

职称

负责教师

2013年1月

Abstract

TheCentercarrier-typeprogressivedieforU-bendingsheetmetalproductionpartisaveryspecificdivision.Thisstudyrevealsthesheetmetalformingprocesswithmulti-formingdiebyCutofftypefeedingsystem.

ThroughtheFEMsimulationbyDEFORM,itwasacceptedtoU-bendingprocessasthefirstperformancetodesignofstripprocesslayout.

Thenextprocessofdiedevelopmentwasstudiedaccordingtosequenceofdiedevelopment,i.e.diestructure,machiningconditionfordiemaking,diematerials,heattreatmentofpartiallydiecomponents,know-howandsoon.

Thefeatureofthisstudyisthediedevelopmentofscraplessprogressivedieofmulti-stagethroughtheModelingontheI-DEASprogram,componentsdrawingontheAuto-Lisp,CAD/CAMapplication,ordinarymachinetooloperatingandrevisionbytryout.

KeywordsCentercarriertypeprogressivedie,FEMsimulation.Stripprocesslayout,Scraplessprogressivedie,U-bendingprocess,Tryout

1Introduction

Theprogressivedieperformsaseriesoffundamentalsheetmetalworkingattwoormorestagesduringthepressrunningtoproduceaproductionpartasthestripstockmovingthroughthediesurface.Pressworkingfromtheoptimumdiedesignanditsmakinghavebeenthepurposeofmassproductioninthemanufacturingfield.

So,thisstudyneedsawholeofpresstooldata,ourfieldexperiences,andtheoreticalinstructions.Accordingtoupperfactors,thisstudycouldbeachievedtotheoptimumdiedesignthroughtheFEMsimulation,I-DEASmodeling,andpracticalmethodofdiemaking.

Furthermoretheaimofleastdefectscouldbeobtainedmostlybyrevisionthroughthetryout.

2.Diedesign

2.1.Diedevelopingsystem

Fig.1showsthenetworkofdiedevelopmentsystem.

Fig.1.Networkofdiedevelopingsystem.

Inthissystem,itcanbeknownthattheproductionengineering,diemakingtechnology,standardization,troubleshooting,manpower,purchase,tool,material,etc.areconnectedwithasoftwareandhardware,relatedinstructionsofwideanddeeptechnologyanditstheoreticalbackground.

Fig.2showsoneofdiecomponentsdrawingbyexistingAuto-LispprogramundertheAutoCADandWindowenvironment.

Fig.2.DiecomponentdrawingbyAuto-Lisp.

Somethingoftheotherdiecomponentsdesignhavefollowedtothismethodandexperiences.

2.2.Stripprocesslayout

Thedispositionofpartonthestripfeedunfoldingwasdisplayedwithaconstantarearepeatedly.

Duetouppercause,itmustbeenoughthatthedecisionofstripfeedingdistance（advance,pitch）anddispositionofeachstageonthestriplayoutareperformedexactly.Ourintentionconsideredthatthebestutilizationratioofsheetmetalcanbeobtainedastakingtheaccuratestripprocesslayoutdesignthroughthetheoreticalcalculationandfieldexperiences.

Thisistheoptimummethodofinitialdiedesign.Atthistimewereferredthewebsizeonthestripfromdatabaseanditsrelatedinstructions.

Fig.3.Flowchartofstripprocesslayoutdesignsystem.

Fig.3showstheflowchartstripprocesslayoutdesignsystem.Forthedesignofstripprocesslayout,thefirststepishowtodecidethefeedingmethodaccordingtothequantityofproductionpart,accuracyofproductionpart,materialproperties,andmaterialthickness,thesecondstepisfollowedtothisflowchartofFig.3.Fig.4showingtheproductionpartanditsdevelopinglength（99mm）usedtothethicksheetmetal（material:

SPCCandthickness:

1.3mm）productionpart.Fromthestripprocesslayoutdesigningmethod,wecoulddesignthefollowingstripprocesslayoutasshowingFig.5byFig.4productionpartdrawing.Thestripprocesslayoutwasconsideredthatthepropersizesarestripwidth,web-size,advance,notchingallowance,etc.

Fig.4.Drawingofproductionpartanditsdevelopinglength:

（a）partdrawingand（b）partdevelopinglength.

Fig.5.Drawingofstripprocesslayout.

Thefirststageoperatespiercing,thesecondstageworkspiloting,thethirdstageworksnotching,fourthstageworkspiercing,andfifthstageperformspilotingwithaidleness.

Thesixthstageisfirstbendingstage,alsoseventhstageworkspiercing.

TheeighthstageworksU-bendingasthesecondbending.Wemusttakecareofpilotdamageoritsfracturethroughthecausesofdislocationontheeverystage.Theninthstageisidlestage.The10thstageissizingstage.The11thstageworkspartcuttingasacompletestage.Afterthat,thestrippro