《組合體讀》PPT課件

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1、Outlineofreading讀圖要點(diǎn)Methodsofreading讀圖的方法Exercises練習(xí)題ReadingViewsofCompositeSolids組合體的讀圖請(qǐng)點(diǎn)擊相應(yīng)標(biāo)題顯示其內(nèi)容Outlineofreading讀圖要點(diǎn)1.Understandingthemeaningofindividuallinesandotherdrawingelementsoftheview.要讀懂視圖中圖線、線框的含義。(2)Eachclosedloopoflines/curvesrepresents:視圖上每一封閉線框可表示:請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容(1)Line

2、sandcurves(includingcirculararcs)representthefollowing:視圖上圖線有直線、曲線(包括圓弧)，它們表示:B1)Theprojectionofaccumulationplanes.具有積聚性表面的投影。2)Theprojectionofintersectionoftwoplanes.兩表面交線的投影。3)Theprojectionoftheoutlineofcylindricalsurfaces.曲面輪廓線的投影。AC1)Theprojectionofaplane.平面的投影。2)Theprojectionof

3、acurvedsurface.曲面的投影。3)Theprojectionofacurvedsurfaceanditstangentplane.曲面與其切平面的投影。IⅡⅢOutlineofreading讀圖要點(diǎn)2.Readingseveralviewssimultaneously.要幾個(gè)視圖聯(lián)系起來讀。Oneviewmaynotbeabletorevealgeneralspaceshapeofcompositesolids.一個(gè)視圖是不能反映物體的確切形狀的,故讀圖時(shí)不可孤立地只看一個(gè)視圖。Example1.Thinkoftheleftviewfromthegive

4、nfrontview.根據(jù)主視圖,想象其側(cè)視圖是何形狀。請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Whenreadingdrawings,weshouldnotmakeaconclusionafterreadingonlyoneortwoviews.Weshouldcarefullycompareallviewsandmakeaconclusionuntiltheycanbefullyexplainedfollowingtheprinciplesofprojection.在讀圖過程中切忌看了一、二個(gè)視圖就下結(jié)論，各視圖要反復(fù)對(duì)照，直至都符合投影規(guī)律時(shí),才能最后下結(jié)論。（注意:二個(gè)視

5、圖有時(shí)也不能反映物體的確切形狀）Example2.Thinkoftheleftviewfromgivenviews.根據(jù)主、俯視圖,想象其側(cè)視圖是何形狀。請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Outlineofreading讀圖要點(diǎn)2.Readingseveralviewssimultaneously.要幾個(gè)視圖聯(lián)系起來讀。3.Readingstartsfromaviewthatmostreflectsshapecharacteristics.要從反映形狀特征的視圖讀起。Whilereading,wemustpayspecialattentiontothecharactervi

6、ewforidentifyingthebasicshapeofthecompositesolid.看圖時(shí)，應(yīng)抓住特征視圖，確定組合體基本形狀。4.Analyzingrelativepositionandintersectionofneighboringsurfaces.要認(rèn)真分析相鄰表面間的相互位置和交線。請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容Outlineofreading讀圖要點(diǎn)Whilereading,weshouldalsopayattentiontorelativelocations,suchasfront-and-back,tall-and-lowandinter

7、sectionlocations.讀圖時(shí)，要注意分析相鄰面的前后、高低和相交等相互位置。Example3.Thinkofthesolidshapefromthegiventopview.根據(jù)俯視圖想象該立體的結(jié)構(gòu)形狀。ABCThegeneralprocedureofreadingisasfollows:firstreadtheprimarycomponent,thenreadtheothercomponents;firstreadeasycomponents,thenreaddifficultcomponents;firstreadtheoverallshape