Design And Analysis Of A Novel Magnetic Impact Electric Hammer

As the working conditions of the electric hammer products are very complicated, the properties of the electric hammer are very high. But the electric hammers made in our country have various kinds of problems, such as short working time,easy to heat,easy to wear andLarge noise and vibration. In order to solve these problems, a novel kind of electric hammer based on magnetic impact theory is presented in this paper, and the reciprocating movement of the punch was realized by the magnetic forces including attractions and repulsion generated by the permanent magnet materials. Compared with conventional transmission methods, magnetic impact has the virtues of simple structure, low pollution and no friction and wear. In conjuction with national natural science foundation of China and major scientific and technological project in Zhejiang Province and the practical requirements, this thesis takes the magnetic impact electric hammer as research object, designs the structure of the electric hammer, studies the impact performances of the magnetic impact mechanism and carries out relevant research about main parameters design optimization. The full text is divided into the following six chapters:The first chapter elaborates the research background and significance of this subject. Furthermore, it summarizes the research situation of electric hammer products,magnetic transmission technology and magnetic numerical method both here and abroad as well as the key technology involved in subject study, and points out necessity and probability of the research about the magnetic impact electric hammer.The second chapter introduces the basic theory of the electric hammer, and the detail structure of the hammer is designed. It mainly includes the design of the magnetic impact mechanism and reduction gearing.In chapter three, according to the basic theory on numerical analysis for electromagnetic field, the 3D finite element model is established. The magnetic field and mechanical properties of the magnetic impact mechanism in static state, and the variation of the magnetic force and impact energy in the reciprocation process were calculated with finite element method by software ANSYS, respectively.In chapter four, magnetic impact mechanism with different pole numbers and angle distributions have been studied,the relationship between the main design parameters such as the minimum gap, the radius and thickness of the magnet and the performance have been analyzed. And sample points have been selected to establish surrogate model, the main design parameters have been optimized.In chapter five, experimental platform has been set up, and the magnetic forces between the magnets have been measured, the results of the experiment verify the correctness of the simulation model. What's more, the process prototype of the electric hammer has been introduced.Chapter six makes the conclusion of the paper and gives research work of the next step.