关于三维模型生成二维工程图时圆角绘制相关标准的修改建议

Suggestions on Standard Modification about Fillet Drawing and Dimension in the Process of 2D Drawing Generated from 3D Model

说明了特征建模软件中关于圆角边界线、圆角棱边线和圆角轨迹线三者的区别和联系。指出了《机制制图图样画法图线》和《机械制图尺寸注法》中关于圆角绘制和标注方面存在的问题,给出了有问题的几种情况。提出了关于圆角绘制和标注的修改方案,建议对相应的国家标准进行修改,以适应CAD/CAM技术的发展,提高工程图表达的准确性。

The drawing methods of fillet in the feature-based CAD software is illustrated with the concepts about fillet boundary, fillet edge and fillet locus. Moreover, the problems of fillet drawing and dimensioning in the national standard, GB/T 4457.4（2002） and GB/T 4458.4（2003）, are analyzed by some examples. Then the solutions how to improve the above problems are put forward and some suggestions are proposed for modifying related national standards.