機械図面構造モデルに基づく高機能二次元CADの開発 : 第2報, 図面構造モデルに基づく寸法整合処理について

概要

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This paper presents two kinds of dimension-matching processing in a highly-functional 2-D CAD system for mechanical parts. One globally fixes the location and length of line segments of outlines so that they can be kept in conformity with given dimensions and tacit constraints. First, we discuss the degree of freedom of internal dimensions defined on the line segments, which coincides with the total number of loop constraints, constraints by given dimensions and tacit constraints. On the basis of discussion, we present a method for finding tacit angular constraints and lowering the degree of freedom. Then, we propose a method for verifying that necessary and sufficient constraints are given for the drawing and a method for deriving simultaneous linear equations corresponding to all of the above constraints. The other locally fixes the location and length of other drawing elements. This is done by tracing the tree of relationships in the relationship representation model which has been generated by the method mentioned in the previous report. Some examples are also shown.
一般社団法人日本機械学会の論文
1992-09-25