Effect Of Cooling Process On Heat Transfer Of Thin Slab Mold

The heat transfer process in the high-speed thin slab continuous casting mold is complicated.The related technology is still in initial stage in our country.It is difficult to analyze and grasp the heat transfer process between the molten steel,copper wall and cooling water in the mold.There are many gaps in the research of the problem for thin slab mold heat transfer.Based the copper wall thermocouple on the temperature measurement of the FTSC mold,the contact thermal resistance is used to describe the slag film,the air gap and the contact heat transfer behavior between the casting slab and the copper wall,and get the heat flow distribution of the casting slab by repeated iterative coupling.Establish two-dimensional and three-dimensional copper wall/slab heat transfer model and copper wall/cooling water analysis model.Aiming at the cooling island type and water hole type molds,the heat transfer analysis system of the mold casting billet-copper wall-cooling water is formed by using the Multiphysics and FLOTRAN modules of ANSYS software,and analyze the influence of the cooling process on the heat transfer of the copper wall and the cooling water.The peak temperature positions of the mold copper wall and cooling water are basically the same as the forward water supply by using the reverse water supply process.The maximum temperature is reduced by 117.4 ? of the hot surface of the cooling island mold copper wall,and the peak temperature is reduced by 24.0 ? of the cooling water,reduce the boiling tendency of cooling water.The boiling tendency of water can effectively prolong the life of the copper plate under high thermal shock.The peak temperature of the copper wall and cooling water can reduce significantly by increasing the cooling water speed,but the water has no obvious effect on the maximum temperature of the copper wall and cooling water of high speed(14 m/s).The inlet temperature of cooling water has a relatively small effect on the copper wall and cooling water temperature.Under the condition that the cooling water does not boil,the change in the pressure of the cooling water supply has no effect on the hot surface of the copper wall and the temperature of the cooling water.High back pressure operation(water supply pressure greater than 1.4 MPa)can effectively inhibit the boiling of cooling water.The location of the cooling water channel and the effective thickness of the copper plate have significant effects on the peak temperature of the copper wall of the cooling island mold.The distance between the cooling channel and the hot surface of the copper wall increased from 15 mm to 35 mm,and the maximum temperature of the hot surface of the copper wall rose from 354.4 ? to 538.9 ?.The effective thickness of the copper plate decreases,the peak temperature of the hot surface of the copper plate is reduced,and the lateral uniformity of the temperature of the hot surface of the copper wall deteriorates.Reasonable control parameters help to reduce the melting loss of the copper plate in the meniscus area,and improve the life of the mold and the quality of the casting slab.By studying the temperature field of the copper wall and cooling water of the thin slab mold under high casting speed,it is important to enrich the analysis method of heat transfer between the mold slabcopper wall-cooling water and to provide theoretical support for the optimization of high-speed continuous casting process.Figure 59;Table 6;Reference 52...