利用C#识别DXF文件的数控雕刻机系统大学毕业论文英文文献翻译及原文.docx

利用C#识别DXF文件的数控雕刻机系统大学毕业论文英文文献翻译及原文.docx

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利用C#识别DXF文件的数控雕刻机系统大学毕业论文英文文献翻译及原文

毕业设计（论文）

外文文献翻译

文献、资料中文题目：

利用C#识别DXF文件的数控雕刻机系统

文献、资料英文题目：

DXFFileIdentificationwithC#forCNCEngravingMachineSystem

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文献、资料发表（出版）日期：

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翻译日期：

2017.02.14

附录1外文翻译-原文部分

DXFFileIdentificationwithC#forCNCEngravingMachineSystem

HuibinYang,JuanYan

Abstract

ThispaperresearchesthemaintechnologyofopenCNCengravingmachine,theDXFidentificationtechnology.Agraphicinformationextractionmethodisproposed.Bythismethod,thegraphicinformationinDXFfilecanbeidentifiedandtransformedintobottommotioncontroller’scode.Sotheengravingmachinecanachievetrajectorytracking.ThentheopenCNCengravingmachinesystemisdevelopedwithC#.Atlast,themethodisvalidatedonathreeaxesmotionexperimentplatform.Theresultshowsthatthismethodcanefficientlyidentifythegraphicinformationincludingline,circle,arcetc.inDXFfileandtheCNCengravingmachinecanbecontrolledwell.

Keywords

DXF,CNCEngravingMachine,GALIL,C#

1.Introduction

Withthedevelopmentofpatternrecognitiontechniques,modernCNCengravingmachineneedn’tbeprogrammedmanually.Byimportinggraphicsfile,thecorrespondingshapewillbeengravedbythemachineimmediately.Theoperatingprocessofthemachineissimplifiedenormously,andtherichprogrammingknowledgeisnolongerneedforoperators.Amongthem,DXFidentificationisakeytechnologyofCNCengravingmachine.ByreadingandrecognitionoftheDXFfile,themachiningtrackcanbedirectlygenerated,sothemotioncontroloftheCNCengravingmachinecanbeachieved.

2.ResearchStatus

ResearchershavedonealotofresearchesonhowtocontactCADsoftwaretoNCcode.OmirouandBarouniproposedaseriesofmachinecodes,withwhichtheadvancedprogrammingabilityisintegratedintothecontrolofmodernCNCmillingmachinesystem[1].KovacicandBrezocnikproposedtheconceptofwhichusingthegeneticalgorithmtoprogramtheCNCmachinebasedontheCADmodelundermanufacturingenvironment[2].ButsomeproblemsarestillexistedinthiskindofCNCprogramming（suchastheartificialparticipationdegreeishigherandtheefficiencyislower）.

TheresearchdirectionofChineseresearchersmainlyincludestwoaspects.OneisthetheoreticalstudyofDXFfileandNCmachining,theotheristheapplicationofDXFfilereading.ZhaiRuiandZhangLiangproposedaprogramstructure,whichisusedtoreaddatainformationofDXFfileanddosomepreprocessbasedonthecrossplatformopensourcelibraryDXFLibbytheanalysisofDXFfilestructurecharacteristic[3].HuangJieqiongandYuanQunwrotetheinterfaceprogramtoreadthestoredpartsgraphicinformationinDXFfilebyuseoftheobject-orientedsecondarydevelopmenttools,ObjectARXandC++,intheresearchofstampingpartsmachining.Thestampingpartsgeometricmodelisautomaticallycreatedbytheautomaticgenerationalgorithmofclosedcontour[4].

3.DXFFileandGraphicInformationExtraction

3.1.DXFFile

DXF（DrawingExchangeFile）isarepresentationofallinformationlabeleddatacontainedintheAutoCADgraphicsfile,andtheASCIIorbinaryfileformatofAutoCADfile.Itcanbeusedasinput/outputinterfaceandgraphicsfileexchangebetweenAutoCADandothergraphicsapplications[5].AcompleteDXFfileiscomposedofsixsegmentscalledSECTION.ThesesegmentswereHEADER,CLASSES,TABLES,BLOCKS,ENTITIESandfileendingcharacter（groupcodeis0,groupvalueisEOF）

3.2.GraphicInformationExtractionMethod

Inordertoextractusefulinformationofthegraphic,manypartsinthefilecanbeignored.ThecorrespondinggeometricdescriptioncanbecompletedaslongasthesectionsofTABLES,BLOCK,ENTITIESareobtained.EachgraphicelementintheDXFfilearestoredwithafixedformat,soitisconvenientfordataexchange,andalsocalleditsreadability.ThecharacteristicsofeachindividualgraphicelementinDXFfileisdescribedbytheparameter（group）consistedbypairedgroupcodeandgroupvalue.Therefore,accordingtothetargetofopenCNCengravingmachine,itisenoughtodescribethetargetgeometrycontourbyreadingtheENTITIESsectioninDXFfilesonly.Theparticularidentificationprocessis:

FirstsearchtheDXFfileuntilthe“ENTITLES”isfound,thenbuildagraphicelementobject.Thensearchthegraphicelementtype（LINE,CIRCLE,ARC）,andsearchthecorrespondingvaluefollowedbythegroupcode.Forexample,iftheprogramhasfoundtheENTITLESsectionandconfirmthefirstgraphicelementisLINE（Theprogramfound“LINE”after“ENTITLES”）.Thenitwillsearchthegroupcodewhichrepresentstheparametersoftheline.Thenumberatthenextlineafterthegroupcodeisthevalueoftheparameter.（e.g.Thenumberatthenextlineafter“10”representtheXvalueofstar