曲面立体的投影.ppt

SummaryofCurvedSolids曲面立体概述RightCylinder圆柱体Cone圆锥体Sphere圆球体Exercise练习题,ProjectionofCurvedSolids曲面立体的投影,请点击相应标题显示其内容,Rightcylinder,Cone圆柱、圆锥,Curvedsolids:Whenanelement(alineoracurve)revolvesaroundanaxis,arevolutionsurfaceisproduced.Curvedsolidsthataresurroundedbyrevolutionsurfacesarecalledrevolution.曲面立体:一条母线（直线或曲线）绕一轴线回转而形成的曲面,称为回转面;由回转面所围成的立体，称为回转体。,Sphere,Cirque圆球、圆环,Curvedsolids曲面立体:,请点击鼠标左键显示后面内容,SummaryofCurvedSolids曲面立体概述,1.Projectionofarightcylinder圆柱体的投影,Drawsteps画图步骤：,请点击鼠标左键显示后面内容,RightCylinder圆柱体,Drawcenterlinesanddatumlines.先画中心线和基准线；Addviewoftheupperorlowerface.再画反映顶或底面形状的视图；Completethreeviews.按三等规律画全三视图。,Limitelementsareusuallytheboundarybetweenvisibleandinvisibleregionsofthecorrespondingprojectiondirection.转向轮廓线通常是回转面上对某投射方向可见部分与不可见部分的分界线。,Method：方法,Itcouldbeobtainedonthecirclefollowingtheprojectionprincipleandaccumulation利用有积聚性的圆投影求之。,2.Gettingpointsonthesurfaceofarightcylinder圆柱体表面取点,Distinguish:判别,Label：标注,Allinvisiblepointsarewritteninbrackets.对不可见的点加括号以示区别。,请点击鼠标左键显示后面内容,Example1.Drawarightcylinderandgetpointsonthesurface.画圆柱及表面上点的三视图,RightCylinder圆柱体,1.Projectionofacone圆锥体的投影,Drawsteps画图步骤：,请点击鼠标左键显示后面内容,Cone圆锥体,Drawcentrelinesanddatumlines.先画中心线和基准线；Addviewofthelowerface.再画反映底面形状的视图；Completethreeviews.按三等规律画全三视图。,Elementmethod辅助素线法,2.Gettingpointsonthesurfaceofacone圆锥体表面取点,Circlemethod辅助纬圆法,请点击鼠标左键显示后面内容,Example2.Drawaconeandgetpointsonthesurface.画圆锥及表面上点的三视图,Cone圆锥体,Limitelementsareusuallytheboundarybetweenvisibleandinvisibleregionsofthecorrespondingprojectiondirection.转向轮廓线通常是回转面上对某投射方向可见部分与不可见部分的分界线。,Allinvisiblepointsarewritteninbrackets.对不可见的点加括号以示区别。,Method:方法,Distinguish:判别,Label:标注,Sphere圆球体,1.Projectionofsphere圆球体的投影,Drawsteps画图步骤：,Drawcenterlinesandsymmetrylines.先画出各视图的回转轴线和对称中心线；Completethreelimitelementsofsphere.再画三个处于转向轮廓线位置的素线圆投影。,请点击鼠标左键显示后面内容,2.Gettingpointsonthesurfaceofasphere圆球体表面取点,请点击鼠标左键显示后面内容,Example3.Drawasphereandgetpointsonthesurface.画圆球及表面上点的三视图,Sphere圆球体,Circlemethod辅助纬圆法,Limitelementsareusuallytheboundarybetweenvisibleandinvisibleregionsofthecorrespondingprojectiondirection.转向轮廓线通常是回转面上对某投射方向可见部分与不可见部分的分界线。,Allinvisiblepointsarewritteninbrackets.对不可见的点加括号以示区别。,Method：方法,Distinguish:判别,Label：标注,Exercise.Completeeachdrawingbyaddingthemissingdetail.补全回转体及其表面上各点的H、W面投影。,(a),a,a,(b),(b),c,c,请点击解答显示其内容,本小节结束,谢谢您的认真学习！,退出,前一页,1.Drawarightcylinderandgetpointsonthesurface.画圆柱体及表面上各点的三视图。,Steps作图步骤：,1）Drawcenterlines.画各视图的轴线;,2）Drawtheaccumulationview.画有积聚性的俯视图;,3）Drawthelimitelements.画主视图轮廓素线;,4）Drawallviewsofcylinder.根据投影规律求圆柱第三投影;,5）Drawallviewsofpoints.由圆柱积聚性投影求各点的三投影。,请点击鼠标左键显示后面内容,c,a,(b),a,(c),b,2.Drawaconeandgetpointsonthesurface.画圆锥体及其表面上各点的三视图。,Steps作图步骤：,1）Drawcenterlines.画各视图的轴线;,2）Drawthetopview.画俯视图的底圆轮廓;,3）Drawthelimitelements.画主视图轮廓线;,4）Drawallviewsofcone.求圆锥的第三投影;,5）DrawallviewsofA.求A点三投影(辅助素线法);,6）DrawallviewsofB.根据B点的特殊位置求其三投影;,7)DrawallviewsofC.求C点的三投影(辅助纬圆法)。,请点击鼠标左键显示后面内容,b,(a),a,(c),c,c,1,P,P,k,k,b,3.Drawasphereandgetpointsonthesurface.画圆球体及其表面上各点的三视图。,Steps作图步骤：,1）Drawcenterlines.画各视图的轴线;,2）Drawthelimitelements.画处于轮廓位置的素线圆投影;,3）DrawallviewsofA.根据A点的特殊位置求其三投影;,4）D