HEAT EXCHANGE IN THE LIQUID COOLANT APPLICATION SYSTEM OF GRINDING MACHINES
DOI:
https://doi.org/10.20998/2078-7405.2020.92.16Keywords:
grinding machine, heat exchange, heat flow, temperature, liquid coolant application system, pressure, flow rate.Abstract
Thermal processes taking place in grinding machines have a great influence on the quality and accuracy of the surface being machined. A liquid coolant application system plays an important role in the formation of heat flows. Each element of that system has a certain effect on the temperature of the coolant and the grinding machine as a whole. This article discusses the structural diagram of heat transfer in the elements of the liquid coolant application system, which consists of a strainer, pipelines, check valve, pump, throttle, hydrocyclone, grinding dust tank of a hydrocyclone, safety valve, control valve, coolant supply device, cutting zone, bed, drain tray, magnetic separator, and coolant reservoir. It is noted that part of the flow energy when passing through an element of the system is converted into thermal energy and causes heating of the coolant, element, and the system as a whole. A technique for defining the heat balance in a coolant application system, taking into account its organizational, structural parameters, cutting conditions, as well as other factors of the grinding process is proposed. Mathematical dependencies for determining the quantity of heat released when liquid coolant passes through each element of the system, taking into account its hydraulic parameters are proposed. The elements of the liquid coolant application system that have the greatest influence on the coolant temperature are identified. A comparative analysis of the heat fluxes passing into the coolant during the passage of the pump was carried out for various grinding processes and the types of grinding machines that implement them. It has been found out that under processing conditions requiring the use of high flow rates and coolant pressures, the heat released in cleaners and other system elements should be taken into account, the operation of which is accompanied by significant pressure differentials. The possibility of monitoring and controlling the temperature of the coolant, based on the fact that the heat generated by the passage of coolant through a device operating under pressure, is also determined by the pressure differential across this device.References
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