基于嵌入式的金属表面热处理智能控制系统

发布时间：2018-01-17 18:17

  本文关键词：基于嵌入式的金属表面热处理智能控制系统　出处：《广东工业大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 嵌入式 热处理 碳势控制 模糊PID 智能控制

【摘要】：热处理是现代制造业特别是装备制造业的重要组成部分之一,是保证金属制品内在力学、物理、化学等使用性能和形状尺寸稳定的关键工序。渗碳是热处理中非常重要的工艺,根据工件性能的不同要求,渗碳后工件表面含碳量为0.8%-1.2%,工件内部碳势呈梯度分布,使表面拥有较高硬度、耐磨性和抗疲劳性,同时心部仍保持较高韧性。渗碳是一个发生多个物理化学反应的复杂过程,碳势控制的精度将直接影响热处理质量。本文总结了目前我国热处理碳势控制的发展现状,设计了基于嵌入式的表面热处理智能控制系统,综合应用了热处理技术、嵌入式技术、传感器技术、网络通信技术和模糊PID控制算法等知识,主要从应用嵌入式技术进行温度和气氛参数的采集、渗碳层浓度分布的实时仿真、模糊PID控制算法、无线网远程监控等几个关键问题展开研究,响应工信部提出的两化融合的号召,对旧式碳势控制系统进行信息化改造,本文的主要研究内容有：1、综合了市场上微机碳势控制系统和单片机碳势控制仪的优点,提出新的设计方案,设计嵌入式系统平台,保证性能的前提下降低成本,以ARM11处理器为控制核心,搭载嵌入式Linux多任务操作系统,集成高精度AD、触摸屏、PWM、WIFI网卡等功能接口,实现氧势、温度的实时采集处理。2、建立碳势控制数学模型,实现工件渗层碳势分布的模拟仿真,采用Qt设计人机界面,实时显示碳势变化曲线和渗层碳势分布模拟曲线。3、研究采用模糊PID算法替代旧式渗碳控制系统采用的增量式PID算法,通过PID参数的在线调节,使碳势的控制具有更小的超调量,更优的稳定性和控制精度。实现复杂的渗碳过程的智能控制,碳势控制精度小于等于+0.05%C,温度控制精度达±2℃。4、系统通过无线WIFI模块构建远程无线碳势监控系统,开发网络通信程序,设计通信接口和数据帧格式,实现热处理生产的信息化管理,包括远程设置工艺、监控碳势温度、数据共享分析。上位机软件可在任何支持Socket通信的平台上独立开发,为上位机软件开发提供更多的选择。
[Abstract]:Heat treatment is one of the most important parts of modern manufacturing industry, especially the equipment manufacturing industry, which guarantees the intrinsic mechanics and physics of metal products. Carburizing is a very important process in heat treatment. According to the different requirements of workpiece properties, the surface carbon content of the workpiece after carburization is 0.8-1.2%. The distribution of carbon potential in the workpiece is gradient, which makes the surface have higher hardness, wear resistance and fatigue resistance, while the core remains high toughness. Carburizing is a complex process of many physicochemical reactions. The precision of carbon potential control will directly affect the quality of heat treatment. This paper summarizes the current development of carbon potential control of heat treatment in China and designs an intelligent control system based on embedded surface heat treatment. Comprehensive application of heat treatment technology, embedded technology, sensor technology, network communication technology and fuzzy PID control algorithm, mainly from the use of embedded technology to collect temperature and atmosphere parameters. Some key issues, such as real-time simulation of Carburizing layer concentration distribution, fuzzy PID control algorithm, remote monitoring of wireless network and so on, are studied in response to the call from the Ministry of Industry and Information Technology. In this paper, the main research contents of the old carbon potential control system are as follows: 1. The advantages of the microcomputer carbon potential control system and the single-chip microcomputer carbon potential control instrument are integrated, and a new design scheme is put forward. Design the embedded system platform, ensure the performance of the premise of reducing the cost, ARM11 processor as the control core, embedded Linux multi-task operating system, integration of high-precision ADand touch screen. PWM WIFI network card and other functional interfaces to realize oxygen potential, temperature real-time acquisition and processing. 2, establish a mathematical model of carbon potential control, and realize the simulation of carbon potential distribution in the layer of workpiece. The man-machine interface is designed with QT to display the curve of carbon potential change and the simulated curve of carbon potential distribution of carburized layer in real time. Fuzzy PID algorithm is used to replace the incremental PID algorithm used in the old Carburizing control system. Through the on-line adjustment of PID parameters, the control of carbon potential has smaller overshoot, better stability and better control precision, and the intelligent control of complex Carburizing process is realized. The control precision of carbon potential is less than 0.05C and the precision of temperature control is 卤2 鈩，

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