The Research Of Gas Atomization And Rapid Solidification Method To Prepare Magnetic Abrasive And Magnetic Abrasive Finish Center

Magnetic Abrasive Finish (MAF) has many advantages, including high efficiency, high precision, easy control, can process various parts with complex shapes and so on. So domestic and foreign experts pay extensive attention to MAF. Many domestic universities and research institutions have done a lot of work. They developed electrolytic magnetic composite grinding technology and rotating magnetic field controlled by pulse circuit technology. They have invented 3-coordinate Digitizing & Copying magnetic tool and studied bonding, sintering, plasma melting preparation, composite plating method. Many foreign experts and scholars invented magnetic fluid grinding apparatus and abrasive jet finishing apparatus. They also focused on the preparation method of magnetic abrasive by plating and infiltration nitrogen method.Our contury has studied MAF only a few years. The study of magnetic abrasive preparation technique is also limited to traditional methods. The magnetic abrasive prepared by these methods have a lot of defects, for example, irregular shape, short life, weak bond between the matrix phase and a ceramic particulate phase, unreasonable distribution of ceramic particles in the matrix, loose substrate. These defects seriously hampered the development of MAF. Therefore, the study of preparation method of magnetic abrasive has an important significance. This paper combined machinery, materials, mechanics, control theory and other disciplines and fouces on magnetic abrasive prepared by gas atomization and rapid solidification technology.The article studied the process of gas atomization and rapid solidification and analysed atomization process of molten metal and solidification process of droplets. The factors that affect the process of gas atomization and rapid solidification were also discussed. A new model of penetration model of abrasive and mechanical action model between ceramic particles and droplets was firstly built. Experiment verified the correctness of the mechanism.Subregional scan method was firstly put forward in order to improve efficiency of surface scanning. The surface contour of workpiece was firstly determined, then it would be divided into a lot of area with regular shape.The last step was to choose appropriate scanning mode for measuring. A new magnetic abrasive library was designed to improve the automation of MAF tool. Magnetic abrasive can be added or abandoned individually.Based on a series of theoretical analysis and experimental research, the paper summarized the factors that affect the atomization process and rapid solidification process. Process parameters were provided to the development of gas atomization and rapid solidification method.