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)Unit14.ppt

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1、Unit14AdvancedManufacturingTechnologyLesson30CharacteristicsofRapidPrototypingTechnologies14.1Lesson31GroupTechnology14.2Lesson32FlexibleManufacturingSystems14.3ReadingMaterials30TheApplicationAreasofRP&M14.4Unit14AdvancedManufacturingTechnologyReadingMaterials31M

2、anufacturingTechnologyforSpecial-purposes14.5ReadingMaterials32RoboticTechnology14.614.1Lesson30CharacteristicsofRapidPrototypingTechnologiesRapidprototypinghasgrownintoitsownuniquemanufacturingdisciplinewithinthepasttwodecades.Asaphysical-model-producingtechnolo

3、gy,itisusefulforidentifyingandcorrectingdesignerror.Severaltechniquesexistforproducingpartsthroughrapidprototyping.Rapid-prototypingprocessescanbeclassifiedintothreemajorgroups:subtractive,additive,andvirtual.Asthenamessimply,subtractiveprocessesinvolvematerialrem

4、ovalfromawork-piecelargerthanthefinalpart,additiveprocessesbuildupapartbyaddingmaterialincrementally,andvirtualprocessesuseadvancedcomputer-basedvisualizationtechnologies[1].Almostallmaterialscanbemanufacturedthrougharapid-prototypingoperation,butpolymersarethewor

5、k-piecematerialmostcommonlyusedtoday(Table14-1).Newprocessesarecontinuallybeingintroducedandexistingprocessesimproved.14.2Lesson31GroupTechnologyGrouptechnologyisaconceptattheveryheartofCIM.CIMissupposedtogivemanufacturerstheflexibilitytoproducecustomizedproductsw

6、ithoutsacrificingproductivity.GrouptechnologyisakeyingredientinthelargerformulaofCIMthatmakesthispossible.Itamountstomakingbatchmanufacturingeconomical.Anynewcomponentsdesignneedsitsownuniqueidentificationnumber,usuallythedrawingnumber,andtraditionallythesewerejus

7、tallocatedinsequence.Withdevelopmentofcomputertechniques,thedrawingscanbestoredonaCADsystemandstoredinadatabase.Grouptechnologyprovidescomponentswithmeaningfuldrawingnumbers.Eachdrawingnumberisallocatedbyacodingsystemandthedigithasmeaning.Ifthecodenumberisknownman

8、yofthecomponentfeaturescanbededucedwithoutreferencetothedrawing.Grouptechnologyinvolvesgroupingpartsaccordingtodesigncharacteristics,theprocessesusedtop