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«The influence of technological modes of obtaining surfaces, close to juvenile and ultrafine powders with a high-speed method in a cryogenic environment»
Keywords:
Juvenile surface, ultrafine powder, high-speed processing, cryogenic environment.
Abstract
The article describes the results of research of technological regimes for high-speed processing of blanks with the aim of obtaining juvenile surfaces and ultrafine powders. As technological factors, the presence/absence of liquid nitrogen in the treatment zone, the speed of rotation of the grinding disk, the longitudinal feed, the characteristics of the abrasive tool, and the physical and mechanical characteristics of the materials being processed are taken. As response functions, when considering the influence of technological factors, foreign impurities are taken on the treated surface, the particle size of the powder and the wear of the abrasive tool. All the studies were carried out on the following materials: alloy solid sintered VK-8, tool steel R-18, brass L63, aluminum alloy D16, ferromagnet M2500NMC1 and neodymium magnet N45M. A raster electronic microscope Jeol JSM-5700 was used in the studies. To obtain the ratio connecting the size of powder particles with technological factors, the method of planning a two-factor experiment was used. The conducted researches made it possible to obtain the following main results. The presence of liquid nitrogen in the processing area allows you to keep the surface clean, preventing its oxidation and the appearance of products on it abrasive wear. The processing of viscous materials becomes possible only with the use of liquid nitrogen. The dispersion of the billet at speeds of rotation of the grinding disc higher than 100 m/s leads to a sharp decrease in the particle size of the resulting powder. Optimum in terms of the particle size of the powder and the amount of wear of the abrasive tool is the use of less than 1 mm/min in the processing of feedstocks. The tensile strength of materials is the only parameter considered by physicomechanical characteristics of materials that affects the particle size.
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