A method for adjusting the secondary cooling roll gap in continuous casting of shaped billets

Abstract

The invention discloses a special-shaped blank continuous casting secondary-cooling roll gap adjustment method which includes the steps: (1), dividing four heat-transfer areas between two pairs of pinch rolls in a continuous casting drawing direction of a special-shaped blank, respectively calculating length and heat flux of each heat-transfer area and calculating water density distribution along the circumference of the casting blank section within a water spraying area and area value of the water spraying area; (2), constructing a two-dimensional heat-transfer model and calculating to obtain distribution of temperature of a casting blank at different solidification stages; (3), according to parameters of mechanical behavior under high temperature and phase transformation behavior of steel grades, building a special-shaped blank continuous casting strain model under high-temperature stress and calculating effective strains of the casting blank at different solidification stages; (4), according to the effective strains, calculating instantaneous strain rate of the casting blank so as to calculate and make a secondary-cooling roll gap shrinkage curve of feature positions of the continuous casting blank of the special-shaped blank.The roll gap shrinkage curve provides a theoretical direction to arrangement and adjustment of roll lines during actual production of special-shaped blank continuous casting.The method has the advantages of improving adjustment precision of the secondary-cooling roll gaps and effectively controlling and improving continuous casting quality of the special-shaped blank.

Description

technical field [0001] The invention belongs to the technical field of material forming and control, and in particular relates to the solidification forming control of continuous casting of special-shaped billets, and in particular to a method for adjusting the gap between secondary cooling rolls of continuous casting of special-shaped billets. Background technique [0002] Shaped blanks mainly refer to I-shaped blanks (such as figure 1 shown), mainly used for rolling H-beams. Compared with ordinary I-beams, H-beams have the advantages of large section modulus, light weight and metal saving. At present, H-shaped steel has been widely used in various industrial fields, such as high-rise buildings, highways, large bridges, offshore drilling platforms, tunnel support equipment, etc. Compared with the traditional continuous casting technology, the direct rolling of H-beams using near-net-shape shaped billets has the advantages of short process, small investment, low energy con...

AI Technical Summary

Problems solved by technology

In the continuous casting of profiled billet, the cooling difference of each characteristic position (web, wingtip and narrow surface) is relatively large, and the solidification shrinkage is irregular and more complicated. If the method of slab and billet is used to determine the secondary cooling of profiled billet The roll gap shrinkage curve will bring a lot of error, but the research on the secondary cooling roll gap shrinkage of the shaped billet has not been reported yet

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