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ID:33701153
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页数:6页
时间:2019-02-28
《基于stepnc的cnc系统中nurbs插补技术研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、万方数据第12卷第1期2007年1月中国图象图形学报JournalofImageandGraphicsV01.12.No.1Jan.,2007NURBSInterpolationTechnologyinCNCSystemBasedonSTEP-·NCDUJuanl’·”,TIANXi—tian¨,ZHANGZhen-ming”,ZHUMing—quan¨,LIJian-ke”。’(SchoolofElectromechanics,NorthwestPolytechnicalUniversity,xi’an710072)2’(SchoolofElectromechanics
2、,TaiyuanUniversityofScience&Technology,Taiyuan030024)AbstractSTEP—NCisanewinterfacestandardfordataexchangingandsharingbetweenCAD/CAMandCNC,andtheCNCbasedonSTEP—NCwillbethenextgenerationofCNCcontroller,whichnotonlyholdslinearandcircularinterpolationbutalsopossessesthecapabilityofsplineinte
3、rpolation.AuniversalNURBS(non—uniformrationalB—spline)basedinterpolatorwasdesignedandtheinterpolationtechniquebasedOffconstantarcincrementandinterpolationalgorithmwereinverstigatedarcincrement.Thevalidityandreliabilityofalgorithmwastestedbyaninstancesimulationandmachining.KeywordsSTEP—NC,
4、non—uniformrationalB—spline(NURBS),splineinterpolation,constantarcincrementinterpolation基于STEP.NC的CNC系统中NURBS插补技术研究杜娟¨,2’田锡天¨张振明¨朱名铨¨李建克¨’(西北工业大学机电工程学院,西安710072)2’(太原科技大学机电工程学院,太原030024)摘要STEP.NC是一个用来实现CAD/CAM与CNC系统问数据交换的接口标准,基于STEP—NC的CNC系统是未来数控技术发展方向之一,该系统不但具有直线和圆弧插补功能,而且还具有样条曲线插补功能。为此设
5、计了一个统一的基于NURBS样条曲线插补的通用插补器,并开发了一种基于等弧长的插补技术和插补算法。最后通过仿真和实例加工验证了该算法的有效性和可靠性。关键词STEP.NC非均匀的有理B样条样条捕补等弧长插补中图法分类号:TP391.7文献标识码:A文章编号:1006—8961(2007)01—0171—061IntroductionCurrently,mostcomputernumericalcontrol(CNC)machinesareprogrammedinG&Mcodes(formalizedbyIS06983),whichisalowlevellanguagesp
6、ecifyingmainlythecuttermotionintermsofpositionandfeedrate.SinceitdeliversonlylimitedinformationtoCNC(excludingthevaluableinformation,suchaspartgeometryandprocessplanimplicatedintheNCcode),itmakesCNCnothingbutanexecutingmechanismcompletelyunawareofthemotionsbeingexecuted,andmakesitimpossib
7、letorealizedataexchangeandsharingbetweenCAD/CAMandCNCsystem[1].Furthermore,ISO6983onlysupportlinearandcircularinterpolationanddoesnotsuppoathesplinedata,whichmakesitincapableofcontrollingfiveormoreaxismilling.Currently,anewandcomprehensivelanguageforCNC,calledSTEP—N
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