The invention provides a free-falling double-stage
powder mixing gas atomizing water-cooling fast-setting magnetic
abrasive preparing method. The method is characterized in that double-stage free-falling nozzles are adopted, the first-stage
nozzle is a low-pressure mixed
powder flow jetting
nozzle, the second-stage
nozzle is a high-pressure gas flow nozzle, the low-pressure mixed
powder flow jetting nozzle is next to the portion above the high-pressure gas flow nozzle, and by adjusting the height of the
water level of cooling water in an atomizing and
cooling chamber, the
cooling speed of powder mixed
molten metal drops is controlled, so that the hard
abrasive forms the magnetic
abrasive distributed on a surface shallow layer of a magnetic abrasive
metal matrix. According to the method, the effect of fully mixing the hard abrasive and
molten metal before atomization is achieved, waste of the hard abrasive is avoided, the proportion of the hard abrasive in the magnetic abrasive is controlled, erosive wear to a single-stage nozzle is avoided, and control over the depth of distribution of the hard abrasive on the surface shallow layer of the magnetic abrasive
metal matrix is achieved; meanwhile, the
flight distance of the powder mixed
molten metal drops is shortened substantially, and the overall height of the atomizing chamber and equipment is reduced. The method is a new technical method for preparing the high-performance magnetic abrasive.