Finite element calculation method for continuous casting solidification heat transfer of beam blank

Abstract

The invention discloses a finite element calculation method for continuous casting solidification heat transfer of a beam blank, and relates to the technical field of steel continuous casting. The method comprises the following steps: establishing a 1 / 2 beam blank two-dimensional geometric model according to the section size of a beam blank; performing grid division on the two-dimensional geometric model of the 1 / 2 special-shaped blank, and establishing a two-dimensional finite element model of the 1 / 2 special-shaped blank; a 1 / 2 beam blank two-dimensional finite element solidification heat transfer model is established for the beam blank continuous casting solidification heat transfer problem; and calculating the temperature field change in the continuous casting process by using the two-dimensional finite element solidification heat transfer model of the 1 / 2 special-shaped blank. According to the method, the complex section shape of the special-shaped blank is fully considered, the triangular units and the general quadrilateral units are adopted, and the actual cross section of the special-shaped blank can be better simulated; appropriate boundary conditions are selected according to different cold areas, the full-process solidification heat transfer of the beam blank continuous casting production is more accurately simulated, and the temperature field change in the beam blank continuous casting process is described.

Description

technical field [0001] The invention relates to the technical field of continuous casting of steel, in particular to a finite element calculation method for solidification and heat transfer of continuous casting of shaped billets. Background technique [0002] The so-called special-shaped billet refers to continuous casting billets with complex cross-sections other than square billets, slabs, round billets, and rectangular billets, among which H-beam is the most widely used. H-shaped steel is an economical cross-section profile, which has the characteristics of thin wall, parallel inner and outer flanges, and right-angled leg ends. It has excellent mechanical properties and service performance. It is widely used in various fields of national economic construction, such as bridges, large-scale A large number of H-shaped steel is used in ships, earthquake-resistant facilities and high-rise buildings. At present, there is a lot of room for the development of H-shaped steel in ...

AI Technical Summary

Problems solved by technology

[0005] The boundary conditions of the continuous casting process are relatively complicated. The current various commercial software cannot calculate the solidification heat transfer process in a short time, and the existing online solidification heat transfer models developed by individuals are mainly used in billets, slabs, etc. Conventional slabs, there are not many special-shaped slabs

For example, the Chinese patent with the document number CN 103192048 B "A Simulation Method for Solidification and Cooling Process of Continuous Casting Slab Based on Accurate Thermophysical Parameters" needs to rely on continuous casting cooling process simulation and optimization software, and currently only targets medium-thick slabs and cannot be expanded. to special-shaped billets; the Chinese patent application CN 109446748 A "a method for simulating the solidification process of continuous casting round billets" simulates the solidification process of continuous casting round billets by establishing a round billet solidification heat transfer mathematical model, which is only applicable to continuous casting For round billets, the numerical simulation method used is the finite difference method, which is cumbersome to deal with irregular areas and has strict requirements on the continuity of the areas; the document number is CN 111199119 A Chinese patent application "Continuous casting special-shaped billet head temperature simulation method "Mainly aimed at the billet head of the special-shaped billet, without considering the overall temperature change of the continuous casting billet, the numerical simulation method adopted is the finite volume method and the orthogonal grid unit is divided, the simulation of the complex section of the special-shaped billet is poor, and the calculation accuracy is difficult to guarantee; literature The Chinese patent application No. CN110941889 A "Research Method for Micro and Macro Crack Initiation and Propagation of Continuous Casting Shaped Billet" simulated the temperature field and stress field of the shaped billet in the crystallizer through ANSYS to find out the most likely source of cracks in the billet. Extended position, but the simulation of temperature field is based on ANSYS finite element software, and its principle has not been explored, so it cannot be applied to the online control system of profiled blanks

[0006] To sum up, the establishment of the solidification heat transfer model of the special-shaped slab 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, uniform cooling of the continuous casting slab, and improvement of the quality of the slab. However, the existing models have not yet targeted Calculation of solidification heat transfer in the whole process of profile billet continuous casting

Images