【作者】 黄志刚；

【导师】 郭钟宁；

【作者基本信息】 广东工业大学 ， 机械制造及其自动化， 2003， 硕士

【摘要】 电火花线切割加工技术因其切削力微小、而且易于加工任何硬度导体或半导体材料的特点，在我国乃至世界机械制造业中，尤其在模具加工领域，发挥着非常重要的作用。目前，我国的高速走丝线切割加工技术已经达到了较高的水平，同时在积极发展和引进低速走丝线切割加工技术。然而，高速走丝切割机床的数控程度并不充分，另一方面，引进的低速走丝线切割机床的数控系统也不能与其完全沟通，这些均限制了我国线切割加工技术的进一步发展。而国产或引进的线切割数控编程软件也分别存在技术滞后、操作不便和通用性不好等缺陷。因此，对适合中国国情的线切割数控技术及其对应的数控编程软件进行研究具有重要的现实意义。 在这种环境下，本文基于开放式体系结构的思想，对计算机辅助线切割数控编程的关键技术进行了研究，包括图形的绘制与编辑，轨迹生成与代码输出，文件转换以及加工仿真等。讨论了开放式数控系统的结构及其特点，并对以开放式结构为目标的线切割编程软件的开发思想进行了探讨；以面向对象理论为基本思想，讨论了线切割数控编程系统的总体设计；讨论了平面复杂曲线的拟合方法，提出了一种速度较快，运算稳定而且效果较好曲线拟合算法—近似等误差双圆弧拟合法；讨论了曲线的平面变换及圆弧连接算法；讨论了加工轨迹的偏移策略，对传统算法的缺陷进行了完善，针对传统算法在处理干涉问题时的失效，提出了无干涉的轨迹偏移算法；研究了3B及ISO数控代码格式及其生成算法；讨论了DXF文档的在文件转换中的作用，并对以DXF文档为中间格式文件转换接口进行了研究；最后对以插补技术为基础的加工仿真算法进行了研究。 在这些研究的基础上，使用C++语言，利用MFC类库，开发了一个线切割辅助编程软件CAWEP。该软件面向PC，以Windows为操作系统，采用了图形交互的编程方式，界面友好，操作方便。更多还原

【Abstract】 Wire Electro-discharge Machining (WEDM) technology is widly used in manufacturing industry because of its minute cutting force and the ability to shape high hardness material, and it has played an important role especially in the field of mould manufacturing. Now in China, Wire Electro-discharge Maching with High traveling Speed (WEDM-HS) has been developed into a high level, and at the same time, the research on Wire Electro-discharge Machining with Low traveling Speed (WEDM-LS) is being further promoted. However, the performance of the CNC system inWEDM-HS is not fully satisfied, and there are still the obstacles between the CNC systems of WEDM-HS and WEDM-LS. On the other hand, the CNC software made in China for WEDM has defects of tech hysteresis and inconvenience, and the import software has poor universality and is hard to use. These conditions have greatly limited the further developement of WEDM technology in China, thus, the research on CNC software for WEDM is meaningful.Under the circumstances, we began the research on CNC software for WEDM by means of an Open Modular Architecture (OMA) conception. The research include almost all aspects of Computer Aided CNC Programing technology, such as the study of graph generation and editing, cutting track generation, CNC coding, file conversion and manufacture simulation et.al.In this dissertation, the framework and features of OMA CNC system has been discussed, and a structure of CNC software for WEDM with OMA conception has been presented. At the same time, we discussed the master plan of WEDM CNC programming system based on the Object Oriented Programming idea; studied the fitting method of planar curve, brought out an efficient and stable curve approximating method-near-equal-error biarc fitting; studied the planar translations of graphs and arc copulations between curves; discussed the offset strategy of cutting track, and brought about a noninterventional cutting track offset method according the defects of conventional algorism; studied the format of 3B and ISO code, and discussed theautomatically code generating algorism; studied the format of DXF files, and made a file converting module which use DXF as transition format; at last, discussed the simulation algorism based on the interpolating technology.Based on the above research works, developed a WEDM programming software-CAWEP, using C++language and MFC foundation classes. The CAWEP software employed interactive graphics automatic programming technology, and will run on PC and Windows platform.更多还原