| Summary: | 碩士 === 國立中正大學 === 機械工程學系暨研究所 === 100 === The process of manufacturing complex shapes and asymmetry work pieces reduces the processing quality and lengthen the processing time due to generated vibration. In order to achieve high efficiency and high precision in the manufacturing process, we must reduce the amount of vibration generated by the unbalances of the work pieces. Previous generation uses electro-magnet actuator, resulting in mono-directional movements. Current generation system uses hydraulic jet actuator with the ability for bi-directional movements, so the balanced-ring can quickly reach equilibrium position. In addition, since each electromagnet actuator is supported by 3 amperes current, it is easy to cause the electromagnet to overheat. Thus there is a considerable degree of danger existing to the system and personnel. After replacing the electromagnet actuator with the liquid jet actuator, the safety of personnel and machine is enhance in all aspects. Not to mention all of the general machine tools are installed with hydraulic devices like pumps, the estimated hardware costs can significantly reduced.
In this study, the Accelerometer and Giant Magneto resistance sensor is used to measure the spindle vibration signal, the spindle reference signal and the phase signal of the balanced-ring. Through the internal circuitry processing and program-related coefficient method, we are able to calculate the size and the angle of the spindle original unbalance quantity. Then we use a hydraulic injection device to drive the balanced-ring to the location of the target angle. To reduce the delay time of the liquid in the injection, we use the negative edge trigger mode to control the switch of the electromagnetic control.
The system is driven by hydraulic jet to move the balanced-ring. The experiment proved that when the system pressure is 9 kg/
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