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两面多框可构视图中存在不可构表面的条件

  

  • 出版日期:2010-06-30 发布日期:2015-08-11

The Conditions of Non-Structure Surfaces in the Enabled Configuration Views with Two-Side-Multi-Frame Structures

  • Online:2010-06-30 Published:2015-08-11

摘要: 对两面多框可构视图中存在不可构表面的条件进行了研究,指出当两面多框可构视图中存在有对称同类形图框,则该对称同类形图框分别为形体上两个不可构表面;当两面多框可构视图中存在不含有同面点集的对应同类形图框时,则该对应同类形图框亦为形体上一个不可构表面;当两面多框可构视图中存在含有同面点集的对应多边形图框(非三角形),且该图框线中至少有一对应边与同面点集同向倾斜或斜交时,则该对应同类形图框亦为形体上一个不可构表面;当一投影直线与一封闭图框对应,且该封闭图框线不与视图中两同面点集出现部分重合时,则该封闭图框亦为不可构表面。

关键词: 工程图学, 构形设计, 可构视图, 对称同类形, 对应同类形, 不可构表面

Abstract: The conditions of non-structure surfaces in the enabled configuration views with two-side-multi-frame are studied. It is concluded that if the symmetrical similar-frame exists in the enabled configuration views with two-side-multi-frame, then the symmetrical similar-frame is the two non-structure surfaces in 3D shape. Corresponding similar-frame is a non-structure surface in 3D shape if there are not the common-plane point groups in this figure. Corresponding similar-frame is a forbidden surface in 3D shape when there are the common planes point group in the frames (non- triangle) and having a line of the frame intersecting or incline from the common planes point group. If one projection straight line corresponds to a closed-frame, and the line of frame does not coincide with part appearing on common planes point group in the frames, then the closed areas are a non-structure surface in 3D shape.

Key words: engineering graphics, 3D shape structure design, enabled configuration views, symmetrical similar-frame, corresponding similar-frame, non-structure surface