关键词: 排样, 成组技术, 射线投影法, 船舶件, 数据库, 特征识别

Abstract: A nesting and CNC cutting system based on group principle for ship parts nesting problem is proposed. It discusses the method of ship parts notch elimination and finishes polygon boundary curve simplification; during ship parts shape feature recognition based on ray projection method, parts are classified into pre-defined patterns; according to part pairing and grouping rules, a polygon pattern grouping method is proposed; NC code generating principle is researched based on DXF files and ship parts nesting database is developed based on SQL2000. Through ship parts nesting system verification, this algorithm is feasible, and NC code generation is correct; it can effectively realize ship parts nesting.

Key words: nesting, group technology, ray projection method, ship parts, database, feature recognition