基于砂带磨削的钛合金复合板材恒压自适应控制研究

摘要

We present a new method of adaptive control with constant pressure on large-scale surface grinding ma- chine for solving the problem of unevenness in the process of abrasive belt grinding on titanium alloy composite plates. The grinding head and the belt follow of the ups and downs the plate surface effectively through contacting the workpiece with the constant pressure. Not only the grinding depth and the size of the titanium alloy plates are en- sured, but also the surface processing quality is improved. We used the Matlab7. 0 for simulation in the minimum va- fiance self-tuning controller, and found that the weighting factor between 1.2 and 2 is better. The results show that： using the adaptive control grinding with constant pressure, the thickness of the material removal of the specimen sur- face is floating between 0. 1 nun -0. 2 nun, and the adaptive control with constant pressure achieves good results.%提出了一种大型平面磨床恒压自适应控制方法，有效地解决了钛合金复合板材砂带磨削加工过程中存在的磨削不均匀问题。通过恒压力接触被磨工件，使磨头磨具能有效地跟随板材型面起伏变化，不仅保证了磨削深度尺寸而且改善了板材的表面加工质量。在对最小方差自校正控制器利用Matlab 7．0进行算法仿真分析时，加权系数取1．2—2之间系统控制效果较好。试验结果表明：采用恒压自适应控制磨削，试件表面各处的材料去除厚度基本在0．1mm-0．2mm之间平稳浮动，恒压自适应控制取得了良好的效果。