组合体读图ppt课件.ppt

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1、Outlineofreading读图要点Methodsofreading读图的方法Exercises练习题ReadingViewsofCompositeSolids组合体的读图请点击相应标题显示其内容Outlineofreading读图要点1.Understandingthemeaningofindividuallinesandotherdrawingelementsoftheview.要读懂视图中图线、线框的含义。(2)Eachclosedloopoflines/curvesrepresents:视图上每一封闭线框可表示:请点击鼠标左键显示后面内容(1)Linesandcurves

2、(includingcirculararcs)representthefollowing:视图上图线有直线、曲线(包括圆弧)，它们表示:B1)Theprojectionofaccumulationplanes.具有积聚性表面的投影。2)Theprojectionofintersectionoftwoplanes.两表面交线的投影。3)Theprojectionoftheoutlineofcylindricalsurfaces.曲面轮廓线的投影。AC1)Theprojectionofaplane.平面的投影。2)Theprojectionofacurvedsurface.曲面的投影

3、。3)Theprojectionofacurvedsurfaceanditstangentplane.曲面与其切平面的投影。IⅡⅢOutlineofreading读图要点2.Readingseveralviewssimultaneously.要几个视图联系起来读。Oneviewmaynotbeabletorevealgeneralspaceshapeofcompositesolids.一个视图是不能反映物体的确切形状的,故读图时不可孤立地只看一个视图。Example1.Thinkoftheleftviewfromthegivenfrontview.根据主视图,想象其侧视图是何形状。请点

4、击鼠标左键显示后面内容Whenreadingdrawings,weshouldnotmakeaconclusionafterreadingonlyoneortwoviews.Weshouldcarefullycompareallviewsandmakeaconclusionuntiltheycanbefullyexplainedfollowingtheprinciplesofprojection.在读图过程中切忌看了一、二个视图就下结论，各视图要反复对照，直至都符合投影规律时,才能最后下结论。（注意:二个视图有时也不能反映物体的确切形状）Example2.Thinkoftheleftv

5、iewfromgivenviews.根据主、俯视图,想象其侧视图是何形状。请点击鼠标左键显示后面内容Outlineofreading读图要点2.Readingseveralviewssimultaneously.要几个视图联系起来读。3.Readingstartsfromaviewthatmostreflectsshapecharacteristics.要从反映形状特征的视图读起。Whilereading,wemustpayspecialattentiontothecharacterviewforidentifyingthebasicshapeofthecompositesolid.看

6、图时，应抓住特征视图，确定组合体基本形状。4.Analyzingrelativepositionandintersectionofneighboringsurfaces.要认真分析相邻表面间的相互位置和交线。请点击鼠标左键显示后面内容Outlineofreading读图要点Whilereading,weshouldalsopayattentiontorelativelocations,suchasfront-and-back,tall-and-lowandintersectionlocations.读图时，要注意分析相邻面的前后、高低和相交等相互位置。Example3.Thinkof

7、thesolidshapefromthegiventopview.根据俯视图想象该立体的结构形状。ABCThegeneralprocedureofreadingisasfollows:firstreadtheprimarycomponent,thenreadtheothercomponents;firstreadeasycomponents,thenreaddifficultcomponents;firstreadtheoverallshape