Design & Research Of Non-Circular Hole Precise Machining Boring Bar And Driving Power Based On Embedded GMA

Rare Earth Giant Magnetostrictive Material (GMM) is a new kind of smart material developed in recent years, which has several inherent excellent properties. In this dissertation, based on the characteristics of the giant magnetostrictive material (GMM), the high-capability GMM actuator and its application on the project of "driving power system and non circular cutting system" have been studied deeply and systematically.The paper includes six chapters, contents of each chapter is stated as follows.In the first chapter, the main future and development of the GMA and non circular cutting system in home and abroad have been discussed. Furthermore, the problems exiting in the update application are pointed out. At the end of this paper, the research significance and aspects of the project are addressed.In the second chapter, the magnetostrictive phenomenon is introduced, the characteristics of magnetization saturation, magnetoelastic coupling, magnetostrictive strain, sensitivity of performance to operation conditions, hysteresis, nonlinear dynamics,â–³E effect, eddy current influence and double frequency property are addressed. Finally, the characteristics measurement methods and results of GMM are introduced. The measurement results supported design of application apparatus.In the third chapter, based on the basic theories of GMA for working and designing, the basic demands are advanced. The GMA based on the GMM concerns the followed objects, 1) dimension of the GMM stick, 2) mechanicals structure analysis and design, 3) electrical structure design, 4) the infections of beforehand stress and the error of temperature to output characteristics. And the finally result is given in this chapter.In the fourth chapter, the theory of the driving power system for GMA is introduced briefly. The character and requirement of driving power supply of GMM is analyzed. The GMA driving power system concerns the two objects, 1) excursion winding generates direct constant current, 2) an available continuous constant current power is designed. The conception of constant current power amplifier is brought forward. A series of experiments prove that the driving system can meet the requires.In the fifth chapter, the design and implementation of the micropositioner system based on GMA which is one of the key components in non circular hole cutting system. According to the characteristic and require for non circular hole cutting, the math model for high frequency boring bar is established. The design method based on finite element analysis for high frequency boring bar is brought out. Using universal finite element analysis soft ANSYS , design the servo-bar, and model analysis can verify the boring bar's frequency.In the sixth chapter, all achievements of the dissertation are summarized and the further research work which will be done is put forward.