【作者】 蒋秋生；

【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， 2005， 硕士

【摘要】 电火花线切割加工技术具有切削力小,适合加工高熔点、高硬度、高韧性等特殊金属材料的特点,因而在模具制造、成型刀具、精密复杂零件的加工中具有广泛的应用。目前我国的快走丝电火花线切割加工技术已经相当的成熟,同时在慢走丝线切割加工技术上也有所引进和发展。然而从总体上来说,快走丝线切割CAD/CAM控制技术的发展相对滞后,操作不便,不能充分利用和紧跟当前计算机技术及硬件的快速发展。随着Windows操作系统的发展与普及,研究和开发基于、Windows平台,适合中国国情的线切割CAD/CAM数控系统具有十分重要的现实意义。 本文基于开放式体系结构的思想,继续对前期开发的线切割CAWEP数控系统进行开发,对其功能进行了扩展和补充。本文首先对快走丝线切割三维上下异形加工的控制模型和插补算法进行了深入探讨,并开发了一种新的上下异形加工的模拟仿真模式;其次,对线切割CAD/CAM位图(BMP)的矢量化加工进行了研究和开发,着重对串行细线化算法及直线拟合算法进行了深入探讨,实现了对无尺寸特殊工件进行扫描后直接加工的功能,经实验验证效果良好,大大提高了线切割编程加工效率;最后对如何通过ISA总线实现上位机PC与下位机运动控制卡的数据通信进行了研究,对基于ISA总线的CPLD译码电路进行了设计和试验,采用最新CPLD器件,大大简化了硬件电路的设计。更多还原

【Abstract】 Wire Electric Discharge Machining (WEDM) is widely used in manufacturing of mould, milling tools, complicate and precision workpiece for its minute cutting force and the ability to machining high-melting materials and high hardness or high toughness materials. Now in China, the machining technique of Wire Electric Discharge Machining with High traveling Speed (WEDM-HS) has been quite mature, and the same time, the research on Wire Electric Discharge Machining with Low traveling Speed (WEDM-LS) is being further promoted. But as a whole, the development of CAD/CAM control technique on WEDM-HS is hysteresis and inconvenience, and the distance to the development of software and hardware of computer is further and further. With the development and prevalence of Windows OS, the research of WEDM base on Windows platform is meaningful.This paper kept on the research on CNC of CAWEP for WEDM by means of an Open Modular Architecture (OMA) conception. Its function was got consummated and complementarity by this paper. In the beginning of this paper, control model and interpolate algorism of top-bottom different shape machining for WEDM-HS has been studied deeply, and a new simulation mode of top-bottom different shape machining has been developed. Then, we investigated and developed a vectorization system for BMP files of WEDM. The thinning-algorism and line fitting algorism were discussed which realized machining of non-measure workpiece. This vectorization system had good effect after many experiments, and advanced efficiency of programming and machining considerably for WEDM. In the end, we discussed how to use CPLD to realize the data transmission between PC and motion-card through ISA bus, and the coding-circuit of CPLD base on ISA-bus was designed and experimented which adopted new chip of CPLD. It simplified the circuit of motion-card significantly.更多还原