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Modelling the process of heat transfer through parts of agricultural machinery in case of gas thermal application of self-fluxing powders

In the course of operation of agricultural machinery, the need for repair works for the replacement or restoration of critical parts occurs. High price of, for example, the crankshaft or camshaft for tractors, harvesters, and cars makes agricultural producers need to develop economically viable resource-saving technologies for the restoration of critical parts. Active development of technology for hardening parts in mechanical engineering has led to the creation of a whole complex of metal-containing powders. At the same time, the possibility of their use in agriculture remains poorly understood. In this study, it is proposed to use the technology of applying selffluxing powders using a gas flame. However, it requires the development of a control and quality control system for the resulting coatings (elimination of overheating of the part, the formation of the preset thickness of the resulting coating), taking into account the volumetric-geometric and physical-chemical parameters of the restored or hardened surface. Quality control of the coatings is the selection of optimal technological parameters that affect the final performance, and changing them according to the given procedure, or keeping them in the stable condition. Adjustable parameters are the distance from the surface of the part to the flame nozzle, when applying self-fluxing powder, and the peripheral speed of the part. Mathematical modeling of the process of heat distribution in the surface layer of a part during coating allows substantiating these parameters. The results obtained in the modeling process (peripheral speed of the part, distance from the part surface to the flame nozzle, and the direction of movement of the burner relative to the part) make it possible to substantiate the technological modes of coating that satisfy the conditions for eliminating overheating of the part and the formation of a uniform coating layer(s) of a given thickness.