考虑实际边界条件的辊式淬火过程温度场数值模拟

This work defined accurate heat transfer boundary conditions, took each nozzle's action area as an independent heat transfer unit, established a temperature field simulation model, and realized the prediction of temperature at any position of steel plate, by means of taking the actual working conditions of N800CF roller quenching as the research object, adopting Fluent finite element analysis software, based on the calculation and experimental verification of the jet heat transfer boundary conditions of different types of nozzles such as the internalslit of the quenching machine, high density I, high density II, etc., and considering that the introduce of the influence of boiling heat transfer affects coefficient to correct the jet heat transfer boundary. The results show that the jet heat transfer boundary conditions of different nozzles are corrected by the correlation coefficient of 0-0.62, and that the maximum error between the calculated temperature and the measured temperature does not exceed 1.25%. During the roller quenching process, the surface of the steel plate exhibits a periodic zigzag cooling process, while the core area presents a continuous and stable cooling process, the edge temperature of the steel plate after quenching is low, and the temperature distribution of the rest is even; the steel plate cools down rapidly in the high pressure section, but its internal temperature gradient is large, with a maximum temperature difference 743.6 °C, which is the key point to the roller quenching process control.