超声振动辅助磨削加工智能控制技术研究

Study on Intelligent Control of Ultrasonic Vibration Assisted Grinding

根据超声振动辅助磨削加工的特点,结合检测难易程度和实际需要,选择磨削力比作为输入。利用磨削力检测系统获得磨削力比实时数据,对采样结果进行分析处理。采用分级控制,分别控制超声功率和工件进给速度。将磨削力比的变化和变化率作为模糊控制器的输入,工件进给速度作为控制器的输出。根据模糊控制规则,利用Matlab提供的Simulink仿真模块,对超声振动辅助磨削加工模糊控制系统进行了动态仿真,仿真结果符合模糊策略,进给速度能够随着磨削力比的变化实现调整,从而避免产生磨削烧伤和颤振。

According to characteristics of ultrasonic vibration assisted grinding,and combined with inspection difficulties and practical needs,the grinding force ratio was chosen as the input.The real time data of grinding force ratio were collected by the grinding force inspection system and processed.The ultrasonic vibration power and the feed rate of workpiece are controlled in hierarchical control strategy.The changes and the change rates of grinding force ratio act as the input of fuzzy controller,and the feed rate of workpiece as its output.According to the fuzzy control rules,the fuzzy control system of combined machining was simulated dynamically by Simulink module in Matlab.The simulation result is accord with the fuzzy control strategy,the feed rate can be adjusted as the change of grinding force ratio,so that the grinding burn and chatter can be avoided.