提出基于实体类型编码和特征编码实现轴类零件自动编程的方法.给出基于节点集的实体打断方法,运用逆时钟最小夹角法,搜索出外轮廓.然后对构成外轮廓的各实体进行类型编码和特征编码,并据此进行主特征提取和辅助特征重构.根据重构后的外轮廓自动生成数控车床能识别的代码.在AutoCAD2002环境下,以ObjectARX为开发工具,用某一典型轴类零件对本文提出的原理和方法进行了验证,结果表明,自动编程效果良好.%A method to realize automatic programming of shaft part is proposed based on type-encoding and feature-encoding of entities. The paper first presents a method of entity-breaking based on pitch point set, and introduces the method of minimum anti-clockwise angle for searching the outline. Secondly, the type and feature of the entities is encoded which constitute the outline. And then, the main feature is extracted and the assistant feature is reconstructed. At last, according to the reconstructed outline, NC code is generated automatically which can be recognized by CNC lathe. With a typical shaft part as an example, a program is developed under the AutoCAD 2002 with ObjectARX, and verifies the methods and principles proposed, which gives an effective result.
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