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ID:14444993
大小:113.00 KB
页数:14页
时间:2018-07-28
《外文翻译-快速成型》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、外文翻译-快速成型河南理工大学本科毕业设计(论文)外文资料翻译题目:RapidPrototyping快速成型学院:机械与动力工程学院专业:机械设计制造及其自动化班级:机制专升本05-1姓名:孙泽章学号:0503050126指导老师:焦锋RapidPrototyping1RapidPrototypingbasicconceptRapidPrototypingisageneraltermappliedtoafamilyoffabricationtechnologiesthatallowengineeringofsolidspartstobemadeinmin
2、imumleadtime.ThecommonfeatureoftherapidprototypingprocessesisthattheyfabricatethepartdirectlyfromtheCADgeometricmodel.Thisisusuallydonebydividingthesolidobjectintoaseriesofsmallthicknessandthendefiningtheareashapesofeachlayer.Forexample,averticalconewouldbedividedintoaseriesofcir
3、cularlayers,eachcirclebecomingsmallerandsmallerasthevertexoftheconeisapproached.Therapidprototypingprocessesthenfabricatetheobjectatthebaseandbuildingeachlayerontopoftheprecedinglayertoapproximatethesolidshape.Thefidelityoftheapproximationdependsonthethicknessofeachlayer.Aslayert
4、hicknessdecreases,accuracyincreases.Thereareavarietyoflayer-buildingprocessesusedinrapidprototyping.Themostcommonprocess,calledstereolithography,usesaphotosensitiveliquidpolymerthatcureswhensubjectedtointenselight.Curingofthepolymerisaccomplishedusingamovinglaserbeamwhosepathlaye
5、riscontrolledbymeansoftheCADmodel.Byhardeningeachlayer,oneontopofthepreceding,asolidpolymerprototypeofthepartbuilt.Virtualprototyping,basedonvirtualrealitytechnology,involvestheuseoftheCADgeometricmodeltoconstructadigitalmock-upoftheproduct,enablingthedesignerandothertoobtainthes
6、ensationoftherealphysicalproductwithoutactuallybuildingthephysicalprototype.Virtualprototypinghasbeenusedintheautomotiveindustrytoevaluatenewcarstyledesigns.Theobserverofthevirtualprototypeisabletoassestheappearanceofthenewdesigneventhoughnophysicalmodelisondisplay.Otherapplicati
7、onsofvirtualprototypingincludecheckingthefeasibilityofassemblyoperations,forexample,partsmatting,accessandclearanceofpartsduringassembly,andassemblysequence.AutomatedDraftingThefourthareawhereCADisusefulispresentationanddocumentation.CADsystemscanbeusedasautomateddraftingmachines
8、topreparehighlyaccurateengineeringdrawin
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