Abstract
Based on the analysis of the matching effect of the D2 operator on the 3D model of castings and its defects, a method of modeling and extracting the 3D structural features of castings considering size is proposed in this paper. The method uses feature recognition algorithm to match castings with similar 3D structure and scale in the process library, and then recommends the process of similar castings as a reference for the process design of new castings. Based on the above method, experiments are carried out in the castings model library. The results show that the proposed method has a good matching effect for casting models, and solves the defects of the D2 operator which is insensitive to scale and indistinguishable from individual models.
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