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1、平面凸輪機(jī)構(gòu)反求設(shè)計(jì)研究摘要反求工程作為先進(jìn)制造技術(shù)的一個(gè)分支,近年來(lái)一直是人們研究的熱點(diǎn)。目前,已經(jīng)在家電、汽車、航天等領(lǐng)域有了廣泛應(yīng)用。文中系統(tǒng)總結(jié)了反求工程的基本概念及其體系結(jié)構(gòu),分析了反求工程與傳統(tǒng)設(shè)計(jì)方法的區(qū)別、反求工程的關(guān)鍵技術(shù)以及目前在國(guó)內(nèi)外的發(fā)展現(xiàn)狀,討論了反求工程中幾種數(shù)據(jù)采集的方法以及經(jīng)采集后的數(shù)據(jù)如何進(jìn)行處理。數(shù)據(jù)處理的一個(gè)重要工作是對(duì)掃描點(diǎn)進(jìn)行編輯,如補(bǔ)償點(diǎn)產(chǎn)生、噪聲點(diǎn)刪除、數(shù)據(jù)點(diǎn)精化、數(shù)據(jù)點(diǎn)加密、坐標(biāo)轉(zhuǎn)換、測(cè)頭半徑補(bǔ)償?shù)?。還敘述了一般產(chǎn)品建模技術(shù),如三維曲面擬合技術(shù)及曲面光順技術(shù)等
2、。論述了UG、Pro/E等軟件系統(tǒng)在反求工程設(shè)計(jì)中的應(yīng)用,討論了模型的建立,舉例說(shuō)明了反求工程的應(yīng)用。凸輪機(jī)構(gòu)是自動(dòng)機(jī)械中』。泛使用的機(jī)構(gòu)。本論文介紹了工程實(shí)際中常用簡(jiǎn)諧梯形組合運(yùn)動(dòng)規(guī)律及多項(xiàng)式運(yùn)動(dòng)規(guī)律,并針對(duì)凸輪實(shí)物模型實(shí)施反求工程來(lái)構(gòu)建其CAD數(shù)字化模型,提出了一些新的觀點(diǎn)和具體實(shí)現(xiàn)方法。論述了凸輪機(jī)構(gòu)運(yùn)動(dòng)規(guī)律的反求方法,建立了數(shù)學(xué)模型,與此同時(shí)研制了相應(yīng)的計(jì)算機(jī)輔助設(shè)計(jì)軟件,取得了預(yù)期的設(shè)計(jì)效果,從而驗(yàn)證了理論的正確性和軟件的實(shí)用性。關(guān)鍵詞:反求工程,凸輪機(jī)構(gòu),運(yùn)動(dòng)規(guī)律,CAD建模,uGRESEARC
3、HoFPLANARCAMMECHANISMSINREVERSEDESIGNINGABSTRACTReverseengineering,onebranchofadvancedmanufacturingtechnologies,isalwaysthehotissueintheyears.Inhomeelectricalappliances,carsandastronaVigations,ithasbeenbroadlyused.Inthisdissertation,thebasicconceptionandsy
4、stemstructureofreverseengineering(RE)wassystematicallysumedup.Thedifferencebetweenthereverseengineeringandthetraditionaldesignmethodology,thekeytechnologiesofreverseengineeringanditspresentstateindomesticandinternationalrangewasanalyzed.Andseveralmethodsof
5、datacollectinganddataprocessinginreverseengineeringwerediscussedaswell.Indataprocessing,itiSaveryimportantjobtoedittheclouddate,suchastoproducemorepreciseclouddata,deletenoisepoints,givebetteraccuracyindata,transformthecoordination,proberadiuscompensationa
6、ndSOon.Thetechnologyofcommonmodelconstruction,suchassurfacefittingandsmoothing,waspresented.TheapplicationofUG,Pro/Eetc.inREandmodelbuildingwerealsodiscussed.AndtheapplicationofREwasdescribedwithanexample.Cammechanismsarewidelyusedinautomaticmachines,Inthi
7、sdissertation,thecommonlyusedharmonic-trapezoidalcombinedmotionlawandthepolynomialmotiontawinengineeringwasintroduced.Severalinnovativeideasandmethodsfocusedonthedigitizingreconstructionofcamsurfaceinreverseengineeringwerepresented.Andamethodofreversingkin
8、ematicslawofcam¨KEYWORDS;reYeFseengineering,cammechartism,kinematjcslaw,CADmodeling,UGlll”嘶M‰㈨"m∽∞如觚艫圣;wm眥∽嗚-呈啪m郫塒e“出比mCei心愀砌塒慨m啦叫Ⅲ酣b叫刪Ⅲ帆~k.㈨訾博卜叭吖叩釓pm心瞅m豳他錨他n?北kTo啪蛐_耋小、北呲舊m引盯n.嘲m嗽m階m吼h∞峙帆1.1引言第一章緒論制造業(yè)是一切生產(chǎn)和裝