关键词: 分类编码, 结构编码, 相似零件查找

Abstract: Aiming at classification codes being not valid for retrieving similar structure parts, a kind of structure code based on assembly structure models was presented. The assembly structure model of part consisted of design function surfaces and their layout. The type, boundary shape, surface attribute of part design function surfaces were expressed by their own symbols respectively, the topology relation and qualitative spatial relation were defined by function surface adjacent graph and qualitative geometrical constraint graph respectively. Branches in an adjacent graph were specified by enclosing them in parentheses, cyclic structures were represented by breaking one link relation in each ring. In this way, the part assembly structure could be expressed by a line notation of letters and digits. On the basis of referring to the line notation for compounds in chemical database, the standard rules, unique rules and qualitative geometry constraint rules of encoding structure were presented. The method was validated by taking flanges as example.

Key words: Classification code, Structure code, Similar Part retrieval