数控技术专业英语 教学课件 作者 黄义俊 电子教案统一模板(数控)Unit7.ppt

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1、Unit7Computer-aidedPartProgrammingLesson13DevelopmentofComputer-aidedCNCProgramming7.1Lesson14Computer-aidedPartProgramming7.2ReadingMaterials13ConversationalProgramming7.3ReadingMaterials14Computer-aidedProgrammingLanguages7.47.1Lesson13DevelopmentofComputer-aidedCNCProgr

2、ammingInthepastprogrammingwasperformedmanually.Theprogramwaswritteninwordaddressandwastailoredtorunonaparticularcontroller.[1]Trigonometrywasamustfordeterminingtoolpath.[2]TheCNCmachineneededtobehaltedwhiletheoperatorkeyedtheprogramintothemachinecontrolunit.TheCNCmachinewas

3、furthertiedupforprogramverification,whichinvolvedmachiningatestpartandinspectingtheresults.Thedigitalcomputer,however,haschangedthewayprogramsarewritten,checked,andrun.Someofthemostdramaticimprovementsprovidedbythecomputerincludeoff-lineprogramming,theuseofcomputer-aidedpro

4、gramminglanguages,andtheapplicationofCAD/CAMtoprogramming.CNCmachinesoperateatoptimumwhenrunningpartprogramsandmachiningparts.[3]Thisgoalisachievedwhennewprogramsarewrittenandtestedatanoff-linecomputerterminal.Theprogramcanbecomposeddirectlyinwordaddress(GandMcodes)withthea

5、idoftexteditingsoftware.Itcanbetestedandthenstoredonpunchedtape,diskette,zipdisketteorCD-ROMmedia.IftheremotecomputerhasacommunicationlinetotheCNCmachine,theprogramcanbedownloadeddirectlytothemachine’scontroller.Thistechniqueisknownasoff-lineprogramming.7.2Lesson14Computer-

6、aidedPartProgrammingCAD/CAMstandsforComputer-aidedDesignandComputer-aidedManufacturing.Experiencedprogrammersusethispowerfultooltosimplifythetaskofwritingandtestingpartprograms.CAD/CAMcandramaticallyboosttheproductivityofCNCshops.TheCAD/CAMapproachissuperiortothetechniqueof

7、usingacomputer-aidedprogramminglanguagetopreparepartprograms.SomeoftheadvantagesofusingCAD/CAMare:1.Thesystemcanbeusedforoff-linecheckingoftheprogram.Resultingtoolpathscanbegraphicallydisplayedonthecomputerscreen.Theusercanzoominandviewthetoolpathsatvariousorientations.Thes

8、ystemcangeneraterealtimematerialremovaldisplaysandflagtoolbreakthroughorpartviolat