Efficiency of microporous coatings grinding using coolant

Wear-resistant microporous coatings on nickel and iron base falls into the category of hard materials, which abrasive treatment is associated with considerable difficulties. The main causes of intractability of these coatings by grinding lie in the rapid loss of cutting properties of the abrasive wheel, due to wear, bluntness and active adhesion of the coating on the working surface of the tool. The results of investigations of the cutting ability of wheels made of aluminum oxide and silicon carbide in microporous coatings grinding without coolant (without coolant), using tap water and oil are presented in the article. The wear of the abrasive grains and the nature of their interaction with the material being processed depending on the composition of the coolant are studied. Ways to improve the efficiency of the grinding process of microporous coatings by applying a chemically active media that can reduce interaction between coatings and abrasive materials are suggested. New coolants with chemically active substances, passivating the surface of microporous coatings on the round outer grinding operations are tested. A proposal about feasibility of replacing the oil compositions of cutting fluids on aqueous compositions that allow to increase the processing capacity and durability of wheels made of aluminum oxide and silicon carbide, while reducing the height of the microscopic inequalities in comparison with the oil compositions is put. Comprehensive assessment of test results by the rating method showed that the most effective in the round external grinding of microporous coatings on nickel and iron-based is the aqueous solution of emulsol "EPM - 1sh."

plasma coatings, abrasive treatment, coolants and lubricants, grinding wheels, cutting forces, tool degradation, surface roughness