Simulation on different cooling methods of large roll diameter casting rolls in slab continuous casting
Applying a large reduction amount of ≥20 mm to a single point of high temperature casting billet in the secondary cooling zone of continuous casting is an important technical means to solve the internal defects such as loose center of casting billet and improve the performance of steel plate,and it is also a hot field of continuous casting technology research in recent years.To implement the function of large reduction,the casting roll with large roll diameter is required.The rolling contact with the slab in the secondary cooling zone is continuous,high temperature and low speed,and the service environment is harsh.The cooling mode of the casting roll is the key factor affecting the effect of large reduction,the life of the roll and the surface quality of the casting slab.ABAQUS finite element software was used to build a two-dimensional heat transfer model of casting roll,and the overall temperature varia-tion rule of casting roll surface and inside under three cooling methods of"double-sided water spraying","single-side water spraying"and"single-side water spraying twice"was simulated.Under the two cooling methods of"double-sided water spraying"and single-side spraying twice water",the proportion of the inner temperature of the casting roll ≤100 ℃ within a rolling cycle is equal,that is,the cooling effect of the roll is equivalent,which can ensure that the entire casting roll works at low temperature most of the time,and can improve the life of the roll.In the indus-trial experiment,the cooling water of the"double water spray"cooling method will drop a large amount of water on the surface of the casting billet before high pressure,and the local temperature will drop rapidly into the high tempera-ture and low plasticity zone,which is easy to cause surface cracks after the implementation of high pressure.There-fore,the cooling method of"single side spraying twice water"is used in the actual production,which solves the prob-lem of cooling water dripping on the surface of the casting billet before large pressure,and has high service life of the casting roll and no crack rate of the casting billet.It provides a good idea for the design of the cooling mode of thel-arge roll diameter casting roll,and lays a foundation for the development and application of the slab heavy pressing technology in the secondary cooling zone.
continuous casting of slabsingle point heavy reductionlarge diameter casting rollcooling methodnumerical simulation
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