Structural and Morphological Control Method of Magnetic Abrasives Prepared by Gas Atomization Rapid Solidification

Abstract

The invention relates to a method for controlling the structure and shape of magnetic abrasives prepared by a gas atomization quick-setting method. By controlling the melting temperature of the ferromagnetic metal at 50-280° C. above the melting point of the corresponding ferromagnetic metal and controlling the injection velocity of the powder-mixing airflow at 0.7-3.0 MPa, the obtained magnetic abrasive has a regular spherical structure. Its hard abrasive is evenly distributed on the superficial layer of the metal body and is firmly combined with the metal body for a longer service life. Hard abrasive particles are mainly distributed in the superficial layer of the ferromagnetic metal body, only a small amount is distributed in the center of the metal body, and almost not distributed in the middle layer between the superficial layer and the center. The cutting edge of the hard abrasive protrudes outside, and the outermost cutting edge is of equal height to the surface of the metal body; it has a strong ability to grind the workpiece to be processed, and can also significantly improve the processing quality of the surface of the workpiece to be processed; guide The high magnetic rate significantly enhances the grinding ability of the processed workpiece and improves the processing efficiency.

Description

technical field [0001] The invention relates to a magnetic abrasive used for magnetic grinding, in particular to a method for controlling the structure and shape of the magnetic abrasive prepared by a gas atomization quick-setting method. Background technique [0002] Magnetic grinding and finishing technology is a new finishing process developed by applying magnetic field to traditional grinding technology; it is an excellent finishing method; it is an effective technical means to improve the surface quality of products. This method has many technical advantages: flexibility, self-adaptability, self-sharpening, controllability, small temperature rise, no need for tool wear compensation, no need for shape modification, etc. Complicated requirements, it can realize the grinding and finishing of three-dimensional complex curved surfaces and solve automation problems; and it can reduce the manufacturing cost of parts, which has caused extensive research at home and abroad. The...

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Problems solved by technology

The current problem of the reaction casting method is that the content of ceramic hard abrasive in the magnetic abrasive is low and the particle size of the hard abrasive is difficult to control

Although this method solves the problem of poor compatibility between the iron-based phase and the abrasive phase, the magnetic abrasive prepared by this method is subjected to the high temperature of the plasma flame, and the sharp cutting edge of the abrasive grain phase is passivated, resulting in a significant reduction in grinding efficiency. , its grinding ability is even inferior to that of magnetic abrasives prepared by other simple methods

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