Abstract
The influence of complex aging processes in water-miscible metalworking fluids on process performance is of high relevance for the metalworking industry. Because of the highly dynamic interactions in the complex “metalworking fluid” ecosystem, a distinct correlation between the aging process and the performance of the fluid in metalworking processes is hardly possible. Consequences of the aging process on physical, chemical, and biological properties of the fluid include aspects such as the decrease of the pH value, the increase of the droplet size in emulsions, the presence of bacterial cells, or the modification of the metalworking fluid composition. In the presented work, the influences of these aging aspects on the lubricity of metalworking fluids were investigated individually. A test series has been carried out, which was planned with a design of experiments method, to investigate interactions between the aging aspects regarding lubricity. In addition, the results enabled the development of an empirical regression model, which allowed an integrated description of the influence of the relevant aging aspects.
Highlights
Metalworking fluids take an important part in a wide range of metalworking processes in modern industry, such as forming, milling, turning, and especially grinding
The term “lubrication” is used here as a general term for the property of reducing friction and wear. This includes the separation of the friction partners by a lubricating film, An increase in lubricity is accompanied by a reduction in the coefficient of friction, which reduces the energy consumption in the manufacturing processes, for example
In order to achieve a complete picture of the aging aspects investigated and to analyze possible interactions between the aspects, a further evaluation of the aging aspects was carried out employing the central composite design, which is Another aspect of the aging process of metalworking fluid is the presence of extracellular polymeric substances (EPSs)
Summary
Metalworking fluids take an important part in a wide range of metalworking processes in modern industry, such as forming, milling, turning, and especially grinding. Changes taking place insurface-active the cooling lubricant areextracellular shown schematically Other such as The low-molecular metabolites, agents, or polymeric in substances consequences of bacterial colonization are decreasing values, increasing sizes [8], or. The in the metalworking fluid occur due to which thermaltake decomposition of molecules and oxidation metalworking fluid is continuously subject to a combination of chemical, physical and which take place in non-water miscible fluids, too. To evaluate the effects of the aging process on the performance of the fluid systematically, the. Separate evaluation of the individual aspects is of great relevance for the investigation of metalworking fluid aging.
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