Study On Parameter Optimization And Dynamic Characteristics Of Mechanical-Electrical Coupling Of Ultra-High Speed Grinding Motorized Spindle System

Compared with ordinary grinding, ultra-high speed grinding has better surface quality and higher efficiency and is suitable for materials which are difficult to process. Therefore, it has been widely applied in machining field of high efficiency and precision. But, owing to high-frequency converters and high-speed motorized spindles more and more widely used in ultra-high speed grinding, it has caused a series of new problems which restrict the development of ultra-high speed grinding technology too. The complicated electromechanical coupling vibration in condition of ultra-high speed grinding, which exists among the high-frequency converter, the motorized spindle, the grinding wheel and the grinding loads, influences the stability of the grinding system and the grinding quality obviously. The traditional mechanical model can only reflect dynamic characteristics between the grinding wheel and the grinding loads, can not reflect dynamic characteristics of electromechanical coupling among the high-frequency converter, the motorized spindle, the grinding wheel and the grinding loads, and can not satisfied the need of study on dynamic characteristics of a modern ultra-high speed grinding wheel system driven by a motorized spindle. Consequently, from point of view of electromechanical coupling, it is necessary to study dynamic characteristics of the spindle system for ultra-high speed grinding. The problem originates from National Fund Project of Natural Science (No.50475054).The electromechanical coupling mathematical model of an ultra-high speed grinding wheel system driven by a motorized spindle, which consists of the converter, the motorized spindle, the grinding wheel and the grinding loads, has been first created. Based on the character of this model, the numerical method was presented and used to analyze dynamic characteristics of the system. Research on parameter optimization and non-stationary processes of electromechanical coupling for an ultra-high speed grinding wheel system driven by a motorized spindle, such as parameter optimization of a converter, the optimization of the starting and speed rising style and the grinding force of importing were made with this model and the method. Also electromechanical parameters of an ultra-high speed grinding wheel system driven by a motorized spindle were studied by the experiment. In condition of variable frequency, phase current signals of a converter output and radial vibration signals of the grinding wheel shield were measured by real time on a 150m/s surface grinder of ultra-high speed, and then study and analysis on signal spectrums were made. From point of view of the experiment, causes of electromechanical coupling...