【作者】 陈伟；

【导师】 朱传敏；

【作者基本信息】 同济大学 ， 机械制造及其自动化， 2007， 硕士

【摘要】 本文从计算机图形显示原理出发，设计并完成了用以检查NC代码准确性的仿真加工系统，该系统动态地仿真铣削加工过程，可以代替传统的试切手段，其主要内容包括：1．NC代码解释。在解释器的语法分析程序制作上采用了YACC工具，本系统的NC代码解释器编辑、调试NC代码，并将代码信息转换成仿真数据。2．基于Dexel模型的仿真加工。本文采用最常用的边界表示法(三角面表示法)对仿真对象刀具与毛坯进行几何描述；在几何描述基础上，生成仿真对象的Dexel结构；基于著名的Bresenham直线扫描算法将刀路轨迹离散成一系列刀位点，在每个刀位点进行刀具与毛坯Dexel结构之间的布尔运算；利用RGB颜色模型进行色调图显示，用于检验严重的加工程序错误。3．实例验证。以相同NC代码作为仿真加工实例，通过比较本系统与SolidCAM软件仿真模块的加工结果，有力地说明本仿真系统在加工效率，Dexel离散精度和仿真效果三者之间找到了最佳切入点。更多还原

【Abstract】 Based on computer graphics principle, this dissertation come up with a machining simulation system to verify NC code. The system can display NC milling in real time and so it can take place of trial cut. The dissertation mainly includes as follow:1. NC code interpretation.The way of using YACC tool to develop syntax parser of interpretor makes system development easier. The interpretor is capable of edit, debugging and also converting NC code data into Simulation ones.2. Dexel model based machining simulation.Firstly, give geometry descriptionof tool and workpiece by the most common B-rep method-trigon-surfacerepresentation. Secondly, create Dexel structure of tool and workpiece based on their geometry description. Thirdly, convert cut track into independent cut locations(CL), in which boolean minus operation carries out between Dexel structure of tool and workpiece. Finally, display the simulating objection and milling surfaces using RGB color model.3. Instance.After a comparison of simultion results between current system and simulation module of SolidCAM through same instance, it is concluded that machining efficiency, dispersion digree and effect keep in a best balance.更多还原