基于GB/T 24734 的三维尺寸快速标注技术

针对当前主流CAD 软件提供的三维标注功能局限的现状，结合制造企业 对复杂零件三维模型快速标注的需求，探讨了基于GB/T 24734 的三维尺寸快速标注技术； 设计并实现了三维尺寸快速标注的算法，详细阐述了其相关的技术。该算法涉及标注面自动 构造、尺寸元素计算、显示处理等一系列技术。其中，标注面构造主要涉及标注面分类、光 标点获取等操作。为了便于尺寸的显示与观察，采用了标注文字的正向显示处理技术。以 CATIA V5 系统为平台，实现了上述算法，开发了快速标注模块，通过实例测试验证了算法 的可行性。

Rapid Three-Dimensional Annotation Based on GB/T 24734

Current mainstream commercial CAD software still has functional limitations that can’t meet the requirements of manufacturing enterprises. To realize the annotation of parts, especially parts with complex features, the rapid annotation of 3D model in CAD system is investigated based on the standard GB/T 24734. A rapid 3D annotation algorithm is proposed, and the relevant technology is illustrated in detail. The procedures of rapid annotation mainly deal with the auto-construction of annotation plane, the computation of dimension elements, and the processing of annotation results. The classification of annotation plane and the cursor point transformation are introduced to automatically construct annotation plane. All the annotation results are handled to display in a forward direction. All the algorithms presented are realized and the verification is conducted on the CATIA V5 system. The results prove that the proposed 3D rapid annotation algorithm performs well.