Defining the design and operating parameters for an energy-efficient unit for continuous microwave treatment of sunflower kernels prior to pressing in order to produce sunflower oil

Vollständiger Abstract

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This study explores a powdered core strip for arc surfacing of complex doped alloy and composite alloys. The task addressed is to determine conditions for uniform melting of the shell and core. The conditions under which, during surfacing, the uneven heating of the shell and core at powdered core strip extension is reduced have been determined. When surfacing composite alloys, this achieves the dosed mass transfer of refractory metal carbides into the weld pool in their initial state and their required volumetric concentration. When surfacing complex doped alloyed alloys, the spillage of the charge components into the core is eliminated, bypassing the drop stage. This achieves chemical homogeneity of the weld metal. Analytical descriptions of the thermal state of the core in the thermal field of the welding current have been substantiated and compiled. Their dependence on the deposition modes, the design of the electrode, the thermophysical characteristics of the core, as well as the duration of the thermal effect, have been established. Thus, with an increase in the charge temperature from 100 to 700°C, the thermal conductivity decreases by 1.3–1.5 times. It has been shown that the intensity of heating the core is determined by the ratio of the intensity of two effects – heat transfer through the boundary layer and heat transfer by the core material. Their quantitative accuracy makes it possible to estimate the redistribution of heat in the core volume, the probability of thermal transformation of the charge ingredients, and local changes in the aggregate state. The results reveal general patterns of heat transfer. Examples with graphical support to the practical implementation of modeling are given, which have shown reasonable reliability for engineering calculations. The established patterns could be used in practice for the processes of restoring parts by arc surfacing methods