关键词: 模具, 分型线, 特征识别

Abstract: To solve the problem of automatically determining parting line for molded part with free form surfaces, an approach was presented by combining technologies of characteristics recognition and finite element method. With the method, a graph-based recognition method was firstly proposed to recognize the undercut features and the product model was simplified by suppressing these features. Then, a finite-element-based discrete method was proposed. The simplified product model was transformed into the discrete surface model by given finite element method, and the visibility of surface was determined by visibility of meshes in the surface. Finally, all surfaces in the product model were classified as visible, invisible and retrogressive groups. After adjusting all retrogressive surfaces into the visible or invisible groups, the parting line was determined by searching the largest edge-loop of these two surface groups. Results from demonstration cases showed that parting line for molded part with free form surfaces could be easily determined and design efficiency was greatly improved.

Key words: mold, parting line, feature recognition, finite element