A Prediction Method of Mold Flux Consumption in Vibrating Mold

Abstract

The present invention is a method for predicting the consumption of mold slag in a vibrating mold, which belongs to the field of calculation of iron and steel metallurgical continuous casting processes. The method first injects and fills the mold slag for testing into the mold slag channel of the vibration mold simulation test device, and starts the vibration crystallization. The mold simulation test device works according to the set vibration parameters, and then collects the pressure value of each pressure test hole on the vibration plate surface of the vibration crystallizer simulation test device, and obtains the slag channel on the vibration plate surface corresponding to each time point. pressure, and finally predict the mold powder consumption within one vibration cycle of the vibrating crystallizer; for the first time, this invention applies the lateral pressure change of the slag channel in the prediction calculation of mold powder consumption, making the obtained mold powder consumption more accurate and consistent with the actual The consumption of mold powder during production is consistent, which has guiding significance for on-site production and provides new ideas for analyzing the consumption of mold powder.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgical continuous casting process calculation, and in particular relates to a method for predicting mold slag consumption of a vibrating crystallizer. Background technique [0002] During the continuous casting process, with the reciprocating vibration of the mold, the liquid mold slag formed on the surface of the molten steel is sucked into the air gap between the mold wall and the slab shell, forming a solid slag film near the mold wall and a liquid mold slag near the slab shell. Slag film; the slag film controls the heat transfer between the crystallizer and the slab shell, affecting the uniform growth of the slab shell, and at the same time, the liquid slag film also acts as a lubricant; the lubrication state of the slab is measured by the consumption of mold slag. Less consumption of slag will lead to thinner slag film formed, increase friction, increase the possibility of slab cracks, sl...

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Problems solved by technology

[0003] The existing methods for calculating mold slag consumption include: (1) According to the empirical formula obtained from the production site: Q=0.44×exp(-0.44R), where Q represents the consumption of mold slag, and the unit is kg m -2 , R represents the ratio of surface area to volume; (2) Solve the mold slag consumption by combining the Navier-Stokes equation and the mass conservation continuity equation; the empirical formula of method (1) only gives the mold slag consumption The relationship with the size of the cast slab does not give the relationship with variables such as vibration parameters, which has little guiding significance; the calculation of the consumption of mold flux in method (2) only considers the pressure change in the longitudinal direction (that is, parallel to the casting direction), However, the change of pressure in the lateral direction (that is, vertical to the billet drawing direction) is ignored, and the lateral pressure of the slag tunnel is regarded as a constant value for calculation. The consumption of mold powder calculated by this method is still not accurate enough; therefore, the existing calculation of mold powder consumption The method cannot accurately predict the consumption of mold powder, and it still has its shortcomings

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