【作者】 朱立峰；

【导师】 李振辉；

【作者基本信息】 长春理工大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 铸造树脂砂等造型材料在铸件浇注及凝固过程中的发气性能,对铸件生产成败是相当重要的。在铸造行业,铸件产品的质量、废品率以及造型的成品率等技术指标无不与各种型砂的发气性能密切相关。因此,如何准确确定出铸砂等造型材料的发气性能是十分必要的。本文首先介绍了铸砂发气性能试验机的总体设计方案和组成模块,对原有试验机的工作原理做了详细地分析,并在此基础上研究了试验机的具体改进方案,包括硬件与软件的改进。文中利用模糊控制原理对试验机恒温控制过程进行了分析与设计,利用Matlab的模糊控制工具箱对试验机温度模糊控制进行了仿真,仿真结果表明本文的控制方法具有更高的智能化程度,比传统的控制方法更加精确,同时本文利用Smith补偿器对系统的时间延迟进行了补偿,并提出了包括复合控制和模糊辨识方法的改进措施;最后本文研究了试验机温度模糊控制的虚拟仪器技术,利用LabVIEW8.2的PID工具包对上述设计进行了仿真和界面设计,验证了该设计的可行性。更多还原

【Abstract】 The gas release performance of forming material, such as casting resin sand, in the process of casts pouring and solidification, which is very important for cast manufacture whether is good quality or bad. In foundry business, the technological index of cast products, such as quality, waste ratio, end product ratio and so on, which closely related to the gas release performance of various forming sand. Therefore, it’s essential that how to measure gas volume of forming material.This paper firstly introduces overall design draft and composed modular of the intelligence foundry sand gas-forming property testing machine, and then analyzes the tester’s principle in the detail, and studies specific improvement scheme of the tester on the basis of previous analysis, including the improvement of hardware and software. The author design and analyze control process which make the tester hold constant temperature with fuzzy control principle in this paper, and establish a fuzzy control simulation environment with MATLAB fuzzy control box, the results indicated that this paper’s method is more intelligent and more precise comparison on the traditional control way. At the same time, the author compensate the time delay of system making use of Smith predict estimation device, and raise new improvement measurement including multiple control and fuzzy identification. Finally the author do research on the virtual instrument technology of tester temperature control, and make simulation and interface design with LabVIEW8.2 PID toolkits, which indicate that the design is practicable.更多还原