三面投影图的形成和基本规律 Formation and F

主讲：陈冬Lecturer:ChenDong三面投影图的形成和基本规律

FormationandFundamentalPrinciplesofThree-ViewDrawing知识回顾Knowledgereview投影的分类

Classificationofprojections中心投影Centralprojection斜投影ObliqueProjection直角投影OrthographicProjection平行投影ParallelProjection知识回顾Knowledgereview一个投影不加任何注释，不能确定物体的形状和结构Aprojectionwithoutanyannotationscannotdeterminetheshapeandstructureoftheobject如何通过投影图，确定物体的形状和结构呢？Howtodeterminetheshapeandstructureofanobjectthroughaprojectiondiagram?三面投影Three-ViewDrawing三面投影Three-ViewDrawing三面投影体系

Three-ViewProjectionSystem由三个互相垂直相交

的投影面构成三面投影体系Thethree-viewprojectionsystemconsistsofthreemutuallyperpendicularintersectionprojectionplanes三面投影：用正投影法将物体分别向三个相互垂直相交的投影面投影后，即可得到物体的三面投影Three-viewprojection:Usetheorthographicprojectionmethodtoprojectanobjectontothreeprojectionplanesperpendicularintersectiontoeachother,athree-viewprojectionoftheobjectcanbeobtained三面投影Three-ViewDrawing平行投影ParallelProjection直角投影OrthographicProjection三面投影Three-ViewDrawing三面投影Three-ViewDrawing三面投影的相关概念Therelatedconceptsofthree-viewprojection正立投影面

V

→

主视图FrontprojectionplaneV→frontview水平投影面H→

俯视图HorizontalprojectionplaneH→topview侧立投影面W→

左视图SideprojectionplaneW→leftview三面投影Three-ViewDrawing三面投影的展开Unfoldingofthree-viewprojection保持V面不动，H面绕OX轴旋转90度KeeptheVplanestationary,androtatetheHplanearoundtheOXaxisby90°再将W面绕OZ轴旋转90度RotatetheWplanearoundtheOZaxisby90°此时V、H、W三个视图共面，称为三视图Atthistime,thethreeviewsV,HandWarecoplanar,whichiscalledthethree-viewdrawing三视图的三个重要关系Threeimportantrelationshipsofthree-viewdrawing三视图的三个重要关系Threeimportantrelationshipsofthree-viewdrawing位置关系PositionalRelationship俯视图位于主视图的正下方Thetopviewislocateddirectlybelowthefrontview左视图位于主视图的正右方Theleftviewislocatedrightabovethefrontview三视图的三个重要关系Threeimportantrelationshipsofthree-viewdrawing投影关系ProjectionRelationship长对正，高平齐，宽相等Lengthaligned,heightlevel,widthequal三视图的三个重要关系Threeimportantrelationshipsofthree-viewdrawing三视图的三个重要关系Threeimportantrelationshipsofthree-viewdrawing例

题

Example课堂小结CourseSummary课堂小结CourseSummary1.三视图的形成及其相关概念1.Formationofthree-viewdrawingandrelatedconcepts2.三面投影的展开2.Unfoldingofthree-viewprojection3.三视图的三个重要关系3.Threeimportantrelationshipsofthree-viewdrawing课后练习After-classExercise课后练习After-classExercise