Finite element calculation method for continuous casting solidification heat transfer of fillet square billet

Abstract

The invention discloses a finite element calculation method for continuous casting solidification heat transfer of a fillet square billet, and relates to the technical field of steel continuous casting. The method comprises the following steps: establishing a two-dimensional geometric model of the rounded square billet according to the section size of the rounded square billet; performing grid division on the two-dimensional geometric model of the rounded square billet, and establishing a two-dimensional finite element model of the rounded square billet; establishing a two-dimensional finite element solidification heat transfer model of the rounded-corner square billet aiming at the problem of continuous casting solidification heat transfer of the rounded-corner square billet; and calculating the temperature field change in the continuous casting process by using the two-dimensional finite element solidification heat transfer model of the rounded square billet. According to the method, the special situation that square billets usually have fillets in actual production is fully considered, triangular units are adopted, when grids are dense enough, any curve of the boundary of a region can be simulated and calculated through segmented straight lines on the boundary, and the calculation precision is guaranteed to a certain degree; a finite element method is adopted for calculation, and the calculation precision is improved; proper boundary conditions are selected according to different cold areas, and the full-process solidification heat transfer of the continuous casting production of the rounded square billets is simulated more accurately.

Description

technical field [0001] The invention relates to the technical field of steel continuous casting, in particular to a finite element calculation method for solidification and heat transfer of round billet continuous casting. Background technique [0002] Billet is a steel billet with a square cross-section produced by a continuous casting machine, which is widely used for processing profiles, wire rods, etc. Billets are produced in a wide range of steel types, covering almost the entire carbon content range of steel. In recent years, with the continuous development of the steel industry, the types of billet alloys have gradually expanded, and the content has gradually increased. With the increase of alloy content, the crack sensitivity of steel grades increases, and various quality defects are more likely to occur in the continuous casting process, and the requirements for cooling uniformity are stronger. [0003] Surface transverse cracks often appear at billet corners. Wh...

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Problems solved by technology

[0005] In the prior art, the Chinese patent "Bloom Continuous Casting Production Process Simulation and Reproduction System" with document number CN 101559480 B uses a rectangular grid to divide the tracking unit. In actual production, the corners of the billet are often rounded. Using a rectangular grid for approximate simulation, the calculation accuracy on the boundary is greatly reduced, and the calculated corner temperature does not match the actual temperature; the Chinese patent "Bloom Continuous Casting Online Temperature Field Detection Method and Secondary Cooling Water Control" with the document number CN101347822B Method" also uses a rectangular grid to divide the tracking unit, and the calculation accuracy cannot be guaranteed; the Chinese patent "Slab Continuous Casting Secondary Cooling and Dynamic Light Reduction Off-line Simulation System" with the document number CN 100561383C mainly solves the problem in actual production. The technical problem of the high cost of adjusting the parameters of dynamic soft reduction, the patent also does not consider how to deal with the rounded corners

[0006] In summary, although the establishment of a billet solidification heat transfer model and the calculation of the temperature field at each moment of the continuous casting process are of great significance for real-time regulation of cooling water to achieve uniform cooling of round billets and improve the quality of billets, the existing models have not considered The rounded corners of the billet cannot accurately simulate the temperature change of the rounded billet in actual production

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