三维零件模型工程尺寸完备性检查算法

With the development of 3D model definition technology, complete dimensioning plays an important role in digital product design and manufacturing. To ensure the integrity of design and processing data and achieve the automatic inspection of dimensioning completeness on 3D part’s models, a novel algorithm of dimensioning completeness inspection is proposed here based on the mapping relation in the parametric modeling. First the mapping is established by analyzing the relation between sets of modeling parameters and engineering dimen-sions, and the mapping matrix is solved by Newton method. Then the mapping matrix is simplified by the row elementary trans-formations, and the judge principle of dimensioning completeness is established by mathematic methods in the analysis of the relationship between the simplified mapping matrix and the dimensioning com-pleteness. Finally, the algorithm for inspection of dimensioning completeness is developed based on the judge principle. The correctness and effectiveness of the proposed approach is verified via the tests on some representative 3D parts based on the CAITA V5 system.