真空钎焊成弧影响因素分析及焊枪控制策略研究

发布时间：2018-06-06 09:33

本文选题：真空电弧钎焊 + 引弧过程　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：真空电弧钎焊技术是一种新型、独特的钎焊技术,在航空工业领域有着巨大应用潜力,真空电弧钎焊设备是我国航空企业用于航空发动机叶片修复工作的主要设备。为了解决真空电弧钎焊引弧过程建弧困难、焊枪不能自动的对弧长进行实时调节两大难题,本文在查阅和调研了大量的现有理论和资料的基础上,结合导师项目——真空钎焊设备电控改造,采用采用现场调研、理论研究、数值模拟和实验研究相结合的方法,对真空电弧钎焊引弧过程影响因素及焊枪控制策略进行了研究。主要研究内容包括：(1)分析了真空电弧钎焊设备的组成及工作原理,建立了焊枪机械手的三维模型及运动学模型,对焊枪进行了结构分析及运动学分析,提出了焊枪控制系统的控制要求；利用ADAMS软件进行了运动学仿真研究,得出了焊枪升降机构的运动特性,满足真空电弧钎焊的工艺要求。(2)从电弧建立的基本机理入手,对引弧过程中各影响因素进行了逐一分析,研究了每一个因素对电弧建立的影响,建立了各影响因素与电弧的数学关系,得出了各因素对电弧建立的影响趋势；结合真空电弧钎焊现实工艺要求,得出了各影响因素最有利于电弧建立的取值或取值范围。(3)分析了电弧的静特性,建立了弧长与弧压之间关系的数学模型,采用了实验数据参数辨识的方法,利用MATLAB软件进行了数学模型求解；建立了焊枪模糊PID自动控制系统,进行了Siumlink控制系统仿真,验证了该控制系统具有良好的响应特性及稳定特性。(4)利用经过改造的真空电弧钎焊设备,采用变量替换的实验方法,进行了引弧过程各影响因素的实验分析,验证了理论研究成果,得出了最有利于电弧建立的各影响因素的取值；进行了焊枪控制系统的实验研究,实验结果表明该模糊PID自动控制系统能够很好的对弧长进行实时控制,具有良好的控制特性,验证和完善了理论研究成果。
[Abstract]:Vacuum arc brazing technology is a new and unique brazing technology, which has great application potential in the field of aviation industry. Vacuum arc brazing equipment is the main equipment used in the aero engine blade repair work of our aviation enterprises. In order to solve the Cheng Jianhu difficulty in vacuum arc brazing, the arc length can not be automatically made to the arc length. On the basis of consulting and investigating a large number of existing theories and data in real time, on the basis of consulting and investigating a large number of existing theories and data, combining the electronic control transformation of the tutor project, vacuum brazing equipment, using the method of field investigation, theoretical research, numerical simulation and experimental research, the influence factors of the arc brazing process of vacuum arc brazing and the control strategy of the welding gun are made. The main research contents are as follows: (1) the composition and working principle of the vacuum arc brazing equipment are analyzed. The three-dimensional model and kinematics model of the welding gun manipulator are established. The structure analysis and kinematics analysis of the welding gun are carried out, the control requirements of the welding gun control system are put forward, and the kinematics imitation is carried out by the ADAMS software. In real research, the motion characteristics of the welding gun lifting mechanism are obtained. (2) starting from the basic mechanism of the arc establishment, the influence factors in the arc ignition process are analyzed one by one, and the influence of each factor on the arc establishment is studied, and the mathematical relations between the influence factors and the arc are built, and the various factors are established. The influence trend of the factors on the arc establishment, and combining with the actual technological requirements of the vacuum arc brazing, the value or value range of the influence factors most beneficial to the arc establishment is obtained. (3) the static characteristics of the arc are analyzed, the mathematical model of the relationship between arc length and arc pressure is established, and the method of identifying the parameters of the experimental data is adopted and the MATLAB software is used. The mathematical model is solved. The fuzzy PID automatic control system of welding gun is established, and the simulation of Siumlink control system is carried out. The control system has good response characteristics and stability characteristics. (4) using the transformed vacuum arc brazing equipment and the experimental method of variable substitution, the influence factors of the arc ignition process are carried out. Experimental analysis, verified the theoretical research results, obtained the value of the most favorable factors for the establishment of the arc, carried out the experimental study of the welding gun control system. The experimental results show that the fuzzy PID automatic control system can control the arc length well in real time. It has good control characteristics, and the theoretical research is verified and perfected. Fruit.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V263.6;V261.34

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