Research On Output Characteristics Of Magnetostrictive Polishing Device

A big progress on transducer has been seen under the development of magnetostrictive materials. In the aspect of precision actuator, the magnetostrictive polishing device has the advantages which the conventional method and piezoelectric vibrating method do not have. In this paper, magnetostrictive materials’ performance and working characteristics are introduced. The electromagnetic field, vibration modal, piezomagnetic-piezoelectric analogy and harmonic response are analyzed by finite element analysis software. The test system is built to study its static and dynamic output characteristics, thus providing theoretical and experimental basis for the design and production of the magnetostrictive polishing device.Firstly, the development of magnetostrictive materials and polishing device for molds are introduced. The performance differences among Terfenol-D, Galfenol and PZT are listed, and Galfenol is chosen as the material of the vibrator. The overview and existed problems from several kinds of polishing devices at home and abroad are recommended. Based on the contents given, the paper’s significance and research contents are stated.Then, the magnetostriction effect and working characteristics of magnetostrictive materials are elaborated. The vibrator’s model is built by the FEA software, electromagnetic field is analyzed in order to ensure the vibrator is working under the proper magnetic field. The qualitative strain is analyzed by the method of piezomagnetic-piezoelectric analogy. A static test system is built to study the vertical and horizontal output characteristics of the polishing device. The simulation and experiment are combined, and experiment results are in line with expectations.Finally, a power supply circuit contained AC and DC is designed and simulated by software. Self-induction of a single coil is measured as needed, dynamic test system is built. Different capacitances are matched under different frequency to make the current waveform better. In dynamic analysis and test, vibration modal and harmonic response are analyzed by finite element analysis. Six steps of modal analysis are extracted and the top three steps are analyzed in detail. The relation between output displacement and the change of frequency is obtained from amplitude-frequency response curve through harmonic response analysis. Dynamic output characteristics are studied by using dynamic output test system, the frequency is found under which the amplitude is bigger. The results of this paper have been summarized, and the further work is proposed based on the results.