欢迎来到人人文库网! | 帮助中心 人人文库renrendoc.com美如初恋!
人人文库网
首页 人人文库网 > 资源分类 > DOC文档下载

外文翻译向5轴计算机数控加工刀具轨迹的实时生成和控制.doc

  • 资源大小:706.30KB        全文页数:13页
  • 资源格式: DOC        下载权限:游客/注册会员/VIP会员    下载费用:5
游客快捷下载 游客一键下载
会员登录下载
下载资源需要5

邮箱/手机号:
您支付成功后,系统会自动为您创建此邮箱/手机号的账号,密码跟您输入的邮箱/手机号一致,以方便您下次登录下载和查看订单。注:支付完成后需要自己下载文件,并不会自动发送文件哦!

支付方式: 微信支付    支付宝   
验证码:   换一换

友情提示
2、本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译向5轴计算机数控加工刀具轨迹的实时生成和控制.doc

附录A英文资料REALTIMEGENERATIONANDCONTROLOFCUTTERPATHFOR5AXISCNCMACHININGABSTRACTTHISPAPERPRESENTSANEWAPPROACHTOREALTIMEGENERATIONANDCONTROLOFTHECUTTERPATHFOR5AXISMACHININGAPPLICATIONSTHECUTTERPATHGENERATIONMETHODCOMPRISESREALTIMEALGORITHMSFORCUTTERCONTACTPATHINTERPOLATION,CUTTEROFFSETTING,ANDCOORDINATECONVERSIONINADDITION,AGLOBALFEEDBACKLOOPISCLOSEDBYTHECNCINTERPOLATORSOASTOAUGMENTTHECONTROLLEDACCURACYINPRACTICALCUTTERPATHGENERATIONANERRORCOMPENSATIONALGORITHMANDAFEEDRATEADAPTATIONALGORITHMFORTHECONTROLLOOPAREDEVELOPED,RESPECTIVELYKEYWORDS5AXISMACHINING;CUTTERPATHGENERATION;CNCINTERPOLATOR;ERRORCOMPENSATION;FEEDRATEADAPTATION1.INTRODUCTION5AXISCOMPUTERNUMERICALCONTROLLEDCNCMACHINETOOLSAREWIDELYUSEDINMACHININGDIES,MOLDS,TURBINEBLADES,ANDAEROSPACEPARTSTHESEPARTSUSUALLYHAVECOMPLEXGEOMETRYANDAREREPRESENTEDBYPARAMETRICORFREEFORMSURFACESASCOMPAREDTO3AXISMACHINING,THE5AXISMACHININGOFFERSMANYADVANTAGESSUCHASHIGHERPRODUCTIVITYANDBETTERMACHININGQUALITYIN5AXISMACHINING,THEORIENTATIONOFTHETOOLCANBEDETERMINEDBYTHETWOADDITIONALDEGREESOFFREEDOMSOASTOOBTAINEFFICIENTCUTTERPATHSTOACHIEVEHIGHEFFICIENCYANDINTERFERENCEFREECUTTERPATHPLANNING,MANYALGORITHMSFORDETERMINATIONOFTHECUTTERPATHDIRECTIONANDINTERVALANDDETECTIONANDAVOIDANCEOFTHECUTTERINTERFERENCEHAVEBEENDEVELOPEDBASEDONTHESEALGORITHMSTHATAREIMPLEMENTEDINACOMPUTERAIDEDMANUFACTURINGCAMSYSTEM,THECUTTERPATHSTHATCOMPRISECUTTERLOCATIONANDORIENTATIONTRAJECTORIESAREDETERMINEDANDREPRESENTEDBYASERIESOFLINEARORSPLINEMOTIONCOMMANDSTOCONDUCTONLINE5AXISMACHINING,THEMOTIONCOMMANDSGENERATEDBYTHECAMSYSTEMARELOADEDTOTHECNCMACHINETHATADOPTSAREALTIMEINTERPOLATORTHECNCINTERPOLATORCANCONVERTTHECUTTERPATHTOMOTIONTRAJECTORIESOFTHEFIVESEPARATEAXESINORDERTOCOORDINATETHEIRMOTIONIN5AXISMACHININGMANYINTERPOLATORSFORDIFFERENTTYPESOFCURVESHAVEBEENDEVELOPEDAMONGTHEMTHELINEARANDTHESPLINEINTERPOLATORSARETHEMOSTPOPULARINPARAMETRICSURFACEMACHININGITWASREPORTEDBYYANGANDKONGTHATLINEARINTERPOLATORMETHODREQUIRESASIGNIFICANTLYLARGEFILEFORTHELINEARMOTIONCOMMANDSANDRESULTSINFEDERATEFLUCTUATIONALONGTHECUTTERPATHFORTHISREASON,ONLYTHESPLINEINTERPOLATORMETHODISCONSIDEREDHEREBEINGACCOMPANIEDBYTHECOEFFICIENTSOFTHESPLINECURVE,APRESETFEDERATEORVELOCITYCOMMANDISALSOFEDTOTHECNCMACHINEBASEDONTHESPLINECOEFFICIENTSANDTHEFEDERATEREQUIREMENT,THEINTERPOLATORCONDUCTSAREALTIMEINTERPOLATIONORGENERATIONOFTHECUTTERPATHINTHEORY,THEPARAMETRICSPLINEISCONVERTEDTOBEAFUNCTIONOFTIMENOTICETHATINADDITIONTOTHEPATHINTERPOLATOR,THE5AXISINTERPOLATORMUSTCONDUCTACONVERSIONBETWEENTHEWORKPIECECOORDINATEBASISWCBANDTHEMACHINECOORDINATEBASISMCBINWHICHTHECUTTERPATHANDTHEPRACTICALMACHINEMOVEMENTAREDEFINED,RESPECTIVELYINTHEEXISTINGAPPROACH,THEDATAFEDTOTHECNCINTERPOLATORARETHEPATHANDTHEVELOCITYFORTHECUTTERLOCATIONCLTHECUTTERLOCATIONDENOTESTHECENTEROFTHETOOLBOTTOMANDISUSUALLYNOTTHELOCATIONWHERETHECUTTINGTAKESPLACEINCONTRAST,THECUTTERCONTACTCCLOCATION,WHICHDENOTESTHEINTERSECTIONPOINTOFTHECUTTERANDTHESCULPTUREDAURFACE,ISOURMAINCONCERNFORTHISREASON,THECURRENTAPPROACHCANNOTACHIEVEHIGHEFFICIENCYANDQUALITYBECAUSEBOTHTHEGENERATIONANDTHECONTROLOFTHECUTTERPATHAREBASEDONTHECLPATH,RATHERTHANTHECCPATHINCUTTERPATHGENERATION,ACONSTANTCLVELOCITYISUSUALLYASSIGNEDALONGTHECLPATHACCORDINGTOTHESURFACECURVATURE,ACONSTANTCLVELOCITYWILLCORRESPONDTOAVARYINGCCVELOCITYBECAUSETHECCVELOCITYISSIGNIFICANTLYRELATEDTOTHEMACHININGQUALITY,THEEXISTINGAPPROACHMAYRESULTINLOWEFFICIENCYAND/ORLOWQUALITYMACHININGINREALTIMECUTTERPATHCONTROL,THETRADITIONALCNCSYSTEMCONSTRUCTSSERVOSCHEMETHATFOCUSESONELIMINATINGTHEPOSITIONINGERRORSALONGEACHDRIVINGAXESTHESERVOCONTROLSCHEMECANBEMODIFIEDSOASTOELIMINATETHECLPATHERRORHOWEVER,OURMAINCONCERNISTHEDEVIATIONERRORFROMTHECCPATH,WHICHDIRECTLYRELATESTOTHEMACHINEDERRORONTHESCULPTUREDSURFACEACCORDINGLY,CURRENTCNCSCHEMECANNOTACHIEVEHIGHEFFICIENCYINCONTROLOFTHEMACHININGACCURACYINTHISPAPERANEWMETHODFORREALTIMECUTTERPATHGENERATIONFOR5AXISMACHININGISPRESENTEDINTHEPROPOSEDMETHOD,COMPOSITECUTTERDATACOMPRISINGTHECUTTERORIENTATION,THECCLOCATION,THECCVELOCITYANDTHESURFACENORMALAREFEDTOTHECNCINTERPOLATOR,WHICHCONSISTSOFREALTIMEALGORITHMSFORCCPATHINTERPOLATION,THECUTTEROFFSETTING,ANDTHECOORDINATECONVERSIONWITHTHEPROPOSEDMETHOD,THECUTTERPATHISGENERATEDSOASTOSATISFYTHEDESIREDVELOCITYALONGTHECCPATHONTHESCULPTUREDSURFACEINADDITIONTOTHECUTTERPATHGENERATION,THEPROPOSEDCNCSYSTEMCONSTRUCTSAGLOBALFEEDBACKLOOPTOAUGMENTTHEPERFORMANCEINCUTTERPATHCONTROLTHELOOPISCLOSEDBYTHEINTERPOLATOR,WHICHCANMONITORTHEPRACTICALCUTTERPATHSOASTOCOMPENSATEFORTHECCPATHDEVIATIONERRORORTOREDUCEITTHROUGHONLINEADAPTATIONOFTHECCVELOCITYTHISMEANSTOSLOWDOWNTHEMACHININGASTHECCPATHERRORISTOOLARGEINTHISPAPER,WEFIRSTDISCUSSTHEEXISTINGAPPROACHTOCUTTERPATHGENERATIONANDCONTROLANDTHECORRESPONDINGPROBLEMSTHEN,ANEWAPPROACHISPROPOSEDSIMULATIONEXAMPLESAREPROVIDEDTOSUPPORTTHEADEQUACYOFTHEPROPOSEDAPPROACHFINALLY,CONCLUDINGREMARKSAREGIVEN2.TOOLPATHDESCRIPTIONANDMACHINETOOLMOTIONTHECUTTERTOOLSCOMMONLYUSEDIN5AXISMACHININGAREENDMILLCUTTERSTHECUTTER’SENDCANBEFLAT,SPHERICAL,ORFILLETEDFIG1SHOWSATYPICALFILLETEDENDMILLCUTTERWITHATOOLRADIUSOFTRANDACORNERRADIUSOFCRNOTICETHATTHECUTTERFORCR0REFERSTOAFLATENDMILLANDTHECUTTERFORCRTRREFERSTOASPHERICALENDMILLCDENOTESTHECUTTERCONTACTCCPOINTTHATISTHEINTERSECTIONOFTHECUTTERANDTHESCULPTUREDSURFACE,SNISTHEUNITNORMALVECTORTOTHESURFACEONCTANDBTNDENOTETHECCPATHDIRECTIONANDTHEPATHINTERVALORSCALLOPDIRECTION,RESPECTIVELYNANDOARETHECUTTERLOCATIONCLPOINTANDTHETOOLORIENTATIONVECTOR,RESPECTIVELYTRADITIONALLY,THECUTTERORIENTATIONOISSETTOAFIXEDANGLEOFFTHESURFACEPRINCIPLENORMALNDURINGMACHININGHOWEVER,THEANGLEFORMEDBETWEENNANDOCANBEALTEREDSOASTOAVOIDCUTTERINTERFERENCEGEOMETRICALLY,THISANGLECANBEFURTHERDECOMPOSEDINTOANINCLINATIONANGLEANDATILTANGLESOTHATTHEENDMILLISROTATEDABOUTCWITHALONGBANDTHENWITHALONGNBASEDONTHESURFACEANDCUTTERPATHGEOMETRY,,,CNTAND,THECLDATA,LOAREDEFINEDTHROUGHSOMEMATHEMATICALMANIPULATION,WECANHAVETHECUTTEROFFSETTINGALGORITHMASFOLLOWSCOSCOSSINCOSSINCTCCLCRNRRTNBRO(1)SINCOSCOSSINSINOTNB2BASEDONTHEABOVEALGORITHM,THECUTTERLOCATIONANDORIENTATIONTRAJECTORIESAREDETERMINEDANDREPRESENTEDBYLINEARORSPLINEMOTIONCOMMANDSBECAUSETOUTILIZELINEARMOTIONCOMMANDSREQUIRESASIGNIFICANTLYLARGECLFILEANDRESULTSINVELOCITYFLUCTUATIONALONGTHECUTTERPATH,WEUTILIZEPARAMETRICSPLINEFUNCTIONSTOREPRESENTTHECUTTERPATHHEREINPRACTICE,WENEEDTHREESPLINEFUNCTIONSFORTHECUTTERLOCATION,,LXTYTZTANDTWOSPLINEFUNCTIONSFORTHETOOLORIENTATIONONOTICETHATTHETHREECOMPONENTSOFOCANBEREDUCEDTOTWOEULERANGLESINTHISPAPER,THEEULERANGLES,TAND,TAREDEFINEDSOTHATTHETOOLAXISISORIGINALLYINTHEZDIRECTION,THENROTATESWITHTALONGXAXIS,ANDFINALLYROTATESWITHTALONGYAXISACCORDINGLY,WEHAVE11,SINTANXYZTTOOO(3)ATTHECAMSTAGE,THETOOLPATH,LOOR,,,,TTTTTXYZISDEFINEDINACOORDINATEFRAME,WF,WHICHISFIXEDTOTHEPARTORTHEWORKTABLEONTHEMACHINETOOLATTHECNCDESIREDTOOLPATH,,,,TTTTTXYZWITHRESPECTTOWORKTABLEWFLETMFDENOTEAMACHINECOORDINATEFRAMETHATISATTACHEDTOAFIXEDPOINTONTHEMACHINETOOLASSUMETHATTHECUTTERLOCATIONLISAFIXEDPOINTINMFTHISMEANSTHATTHE5DEGREESOFFREEDOMAREALLAPPLIEDONTHEWORKTABLETOCONDUCTTHE5AXISMACHINING,ACOORDINATECONVERSIONALGORITHMFROMWFTOMFMUSTBEIMPLEMENTEDINTHECNCSYSTEMTHISCOORDINATECONVERSION,USUALLYCALLEDANINVERSEKINEMATICSTRANSFORMATION,OBVIOUSLYDEPENDSONTHEMACHINETOOLSTRUCTUREATYPICALMACHINETOOLSTRUCTURETHATISUTILIZEDINTHISPAPERINTHESTRUCTURE,THETOOLISFIXEDANDTHEWORKTABLEISDRIVENBYTHREESLIDINGANDTWOROTATINGAXES,MMXYANDMZARETHEPOSITIONSALONGTHETHREESLIDINGAXESMISTHEROTATIONANGLEALONGXAXISTHROUGHA(,,MMMXYZ,AFIXEDPOINTONTHELOWERTABLEMISTHEROTATIONANGLEALONGTHEYAXISTHROUGHB,AFIXEDPOINTONTHEWORKTABLENOTICETHATFORSIMPLICITY,WELETBBETHEORIGINOFTHEWORKCOORDINATEFRAME,WFLETXYZLLXLYLZAFIXEDPOINTWITHRESPECTTOMFANDASSUMETHATTHECENTEROFTHEUPPERTABLEISRIGHTONTHETOPOFTHELOWERTABLE,IEZBABZWITHTHEABOVEDEFINITIONS,WECANFORMULATETHEKINEMATICSEQUATIONSTHATRELATETHEMACHINETOOLMOTION,,,,MMMMMXYZTOTHECUTTERPATH,,,,TTTTTXYZASFOLLOWS,,,,,,,,TTTTTMMMMMXYZKINEMATICSXYZ(4A)ORSINCOSSINSINCOSSINTMXMMYMMMZMMMXBZLXLYLZCOSSINTYMMZMMYLYLZCOSSINSINCOSCOSCOSTMXMMYMMMZMMMZBZLXLYLZ4BTM,TMAND,,,,,,,,MMMMMTTTTTXYZINVKINEMATICSXYZ5AORCOSSINMXTTTTXLXZSINSINSINCOSSINCOSMYZTTTTTTTTTYLBXYZ

注意事项

本文(外文翻译向5轴计算机数控加工刀具轨迹的实时生成和控制.doc)为本站会员(淘宝运营)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网(发送邮件至[email protected]或直接QQ联系客服),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服客服 - 联系我们

网站客服QQ:2846424093    人人文库上传用户QQ群:460291265   

[email protected] 2016-2018  renrendoc.com 网站版权所有   南天在线技术支持

经营许可证编号:苏ICP备12009002号-5