The Research Of Key Technologies Of Adaptive Constant Pressure Abrasive Belt Grinding For Large-scale Complex Plates

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.