【作者】 闾志明；

【导师】 黄云；

【作者基本信息】 重庆大学 ， 机械电子工程， 2010， 硕士

【摘要】 随着宇航工业和其他工业的迅速发展,对各类大型金属复合板材的表面质量和性能提出了更高的要求。作为工件的大型复合板材与小型平面板材完全不同,通过爆炸结合后一般表面平面度很差,存在不同程度的翘曲变形,表面呈波浪状。采用普通的平面磨削,磨头不能较好跟随工件型面变化,磨削时易出现在工件突起处过量磨削和在工件凹谷处磨削不到的磨削不均匀现象,这样磨削出来的工件表面质量差,其性能已经满足不了实际使用要求了。同时,传统的手工打磨方式不仅劳动强度大、效率低下、环境效益差并且经常也会出现磨削不均匀现象。为了更好的使得磨削加工过程中磨头磨具快速有效地跟随板材型面起伏变化,控制恒压力接触被磨工件,防止出现工件部分位置磨削加工不到位或过磨的现象,以保证其磨削深度尺寸和磨削加工表面质量。结合砂带磨削和自适应的诸多优点,本论文在阅读和研究大量国内外相关领域文献和平面砂带磨削工业控制加工的背景下,开展了针对大型复合板材的自适应恒压砂带磨削关键技术研究。主要内容及研究成果如下:①、分析大型板材在磨削加工中存在的问题,并根据平面砂带磨床磨削控制特点与目前一般控制系统的常用处理方法,对平面恒压砂带磨床控制系统算法策略进行研究,研究了控制系统采用自适应控制算法的必要性和可行性。②、根据平面磨床控制功能的要求,进行了自适应控制系统硬件选型及结构搭建,同时系统进行抗干扰处理,保证控制系统的稳定性。③、结合平面砂带磨床磨头磨削机构和控制系统,研究并建立了系统控制对象数学模型,并进行简化和工程化处理。④、研究了广义最小方差自校正控制器的设计方法及其模型参数辨识方法并进行了算法仿真,并将该算法应用到平面砂带磨床控制中,解决加工大型复合板材磨削过程中磨头不能随板材型面浮动,难以保证恒压磨削的难题。⑤、在平面砂带磨削试验机床上进行了磨削试验研究。试验证明,本课题控制系统采用的自适应自校正控制算法的可行性和有效性。更多还原

【Abstract】 With the rapid development of aerospace industry and other industries, higher requirements of surface quality and performance for large-scale composite plants are put forward. However, unlike small plates, parallelism of larger composite plate after rolling is very poor and different degrees of warpage are existed. Most of composite plates are of difficult-machine materials, so it is extremely difficult to grind oxide made after rolling. As the grinding uneven, quality of the work piece surface is very poor after conventional grinding, which has failed to meet the actual requirements. While the traditional manual grinding is inefficient and uneven grinding phenomena often occur. To effectively solve the problems of abrasive tools change with plate surface, constant pressure contact with workpiece to control grinding depth and grinding not enough or grinding too depth in some position, raising the surface grinding quality. In the paper, key technologies of adaptive constant pressure abrasive belt grinding for large-scale composite plates were studied on the basis of referencing a lot of related literatures home and abroad and combined with the many advantages of abrasive belt grinding and adaptive control.Main research contents and conclusions are as follows:①、Problems of the large-scale composite plants by the grinding have been analyzed. Algorithm strategy of flat belt grinding machine control system has been studied in accordance with abrasive belt grinding machine control characteristics and the present treatment methods commonly used. The necessity and feasibility of adaptive control algorithm system was given.②、According to the requirements of flat grinding machine control functions, construct architecture of adaptive control system hardware selection is established, and at the same time, interference of the system is treated, which ensure the stability of control system.③、The mathematic model of system control object was established and engineering processed combined with the grinding bodies of plat abrasive belt grinding machine and its control system.④、The generalized minimum variance self-tuning controller design method and model parameter identification methods for algorithm simulation were researched. The algorithm is applied to the flat abrasive belt grinder to solve the problem of grinding head can not float with planes surface, difficult to ensure constant grinding in the process grinding.⑤、Grinding tests were conducted on flat abrasive belt grinding machine. It has revealed that the adaptive self-tuning control algorithm used in the control system is feasible and effective.更多还原