导　　师： 薛家祥

学科专业： 080402

授予学位： 硕士

作　　者： ;

机构地区： 华南理工大学

摘　　要： 近年来,双丝焊成为逆变电源研究的一项热点。双丝焊接是一种高效节能、优质经济的焊接工艺方法,能够提高焊接生产效率和焊接质量,本课题在国家自然科学基金/(项目编号:50875088/)及广东省科技攻关项目/(项目编号:2008B010400006/)的支持下,研制了基于DSP的双丝焊数字化逆变电源,并对其进行了电路调试和工艺实验。 本文首先确定了双丝焊数字化电源的总体方案,设计了两台并行的IGBT全桥逆变主电路的拓扑结构。设计了以TMS320F2808 DSP为核心的硬件控制系统,包括DSP基本电路、信号反馈电路、驱动电路、送丝电路以及保护电路。通过测试平台对系统进行全面测试,表明所设计的硬件系统能稳定运行。本研究还根据CO/_2双丝焊接的特点设计了恒压外特性,并确定了软件PI控制算法。 设计了基于ARM MCU和CPLD的人机交互系统,MCU负责模拟信号的采样、按键的响应以及数据的传输,CPLD负责管理LED与数码管的显示。实现了双丝焊参数的数字化输入与显示。 利用研制的双丝数字化焊接电源系统搭建焊接工艺实验平台,通过大量的工艺实验,利用自行研制的4通道焊接电弧动态小波分析仪,对两组电流、电压同时采样,对所设计研究的电源做了全面测试。通过焊接过程采集的电流电压波形图和焊缝照片,对比分析了不同焊接规范的焊接效果。论文进一步对双丝CO/_2焊的工艺参数做了研究,找出了焊接速度与双丝焊接电流对焊接效果的影响规律。实验结果表明该双丝数字化焊接电源能够有效实现双丝CO/_2焊接,且其焊接性能较为优异。 Twin-wire welding becomes a hot spot in research of converter power recently. It is a welding technique with high energy efficiency, high quality and with low economic cost which can raise working production efficiency and welding quality. Supported by the foundations of NSFC /(NO.50875088/) and GDSTC /(NO.2008B010400006/), a digital twin-wire welding converter power supply, based on DSP, was developed and then, circuit test and process experiments were conducted. A general design of digital twin-wire welding power supply was selected firstly, and two side-by-side IGBT full bridge converter main circuit structures were designed. A hardware control system based on DSP TMS320F2808 was designed, including DSP base circuit, signal feedback circuit, drive circuit, wire driving circuit and protection circuit. The hardware system designed could operate stably after total test through test bench. Constant voltage characteristic was also designed according to the character of CO/_2 twin-wire welding process, and software PI control arithmetic was confirmed. A human-machine interactive system was designed based on ARM MCU and CPLD, in which MCU was used for sampling, key pressing and data transmission, CPLD was used for managing LEDs and nixie tube. Thus, digital input and display of parameters in twin-wire welding was achieved. An experiment platform was established for digital twin-wire welding power supply, on which, the digital twin-wire welding power supply was fully tested through a large number of welding experiment, with the help of self-developed 4-channel welding dynamic arc wavelet analyzer. Welding effect of different welding parameters was analyzed through two group of current and voltage wave form collected via welding. Rules were found connected with welding speed and current difference between two wires. That the digital twin-wire welding power supply could achieve twin-wire CO/_2 welding effectively was proved by experiment results, and the welding performance well.

关 键 词： 双丝 数字化 人机交互系统

分 类 号： [TG434.1]

领　　域： [金属学及工艺]