Basic roll gap making method for wide and thick slab casting machine

Abstract

The invention relates to a basic roll gap making method for a wide and thick slab casting machine. The method includes the steps that casting working condition parameters of the casting machine are collected, a solidification and heat transfer three-dimensional finite element model of slabs is established, and a three-dimensional temperature field in the casting process is worked out according to the casting working condition parameters of the casting machine; and a three-dimensional thermal contraction finite element model of the slabs is established and solved with the three-dimensional temperature field in the casting process as a temperature load, a three-dimensional thermal contraction law is obtained, and basic roll gaps of the casting machine under corresponding working conditions are made according to the three-dimensional thermal contraction law and the initial thickness of the slabs. According to the method, the actually-measured flow density in a secondary cooling region serves as the boundary condition, and the computing accuracy of the solidification heat transfer and the thermal contraction law is guaranteed; and according to the feature that heterogeneity exists in solidification heat transfer and thermal contraction in different thickness directions, all fan-shaped-segment basic roll gaps are obtained further through the initial thickness of casting blanks, and the thermal contraction conditions of the casting blanks in different positions and at different casting moments can be computed more accurately.

Description

technical field [0001] The invention belongs to the field of continuous casting of slabs, and in particular relates to a method for formulating foundation roll gaps of wide and thick slab continuous casting machines. Background technique [0002] The slab continuous casting machine is mainly composed of a crystallizer and a sector section composed of different types of closely spaced segmented rolls. During the slab casting process, the molten steel is first cooled by the crystallizer to form a slab with a certain shell thickness, and then undergoes secondary cooling by spraying in the subsequent fan-shaped section and bending and straightening process, and finally it is completely cooled and solidified to form a slab. The slab becomes the final plate through the subsequent hot rolling or cold rolling process, which is widely used in various fields of national production, such as shipbuilding, bridge engineering, power station boilers, heavy machinery, offshore oil and milit...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: the continuous casting process is divided into several solidification stages, and the total shrinkage of the slab during the entire casting process can only be roughly calculated

However, the finite element or finite difference method discretizes the entire continuous casting process in space and time, which can more accurately calculate the thermal shrinkage of the billet at different positions and at different casting times. Therefore, the calculation accuracy of this method is not as good as that of finite element or Numerical simulation method such as finite difference

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