Double-single-point heavy rolling reduction process of continuous casting blank solidification tail end

Abstract

The invention relates to a double-single-point heavy rolling reduction process of a continuous casting blank solidification tail end. The heavy rolling reduction process adopts 2-5 fan-shaped sectionsfor completing, a fan-shaped section roller column is of a horizontal section roller column structure of a wide and thick plate continuous casting machine, four pairs of pinch rolls are involved, a first pair of clamping rollers and a third pair of clamping rollers which are arranged at inlets of the fan-shaped sections are driving rollers, and a second pair of clamping rollers and a fourth pairof clamping rollers are driven rollers; the first pair of clamping rollers and the third pair of clamping rollers are both composed of an upper driving roller and a lower driving roller, the second pair of clamping rollers and the fourth pair of clamping rollers are composed of an upper supporting roller and a lower supporting roller; the upper driving roller of the third pair of clamping rollersis connected with a hydraulic clamping cylinder, and is used for ensuring the casting blank to be continuously stressed, and preventing the casting blank from rebounding and deforming; and the double-single-point heavy rolling reduction process is carried out on the first fan-shaped section after the position with a center solid phase rate of the casting blank fs equal 0.8.

Description

technical field [0001] The invention relates to the technical field of continuous casting production, and is particularly suitable for a double-single-point heavy reduction process at the solidification end of a continuous casting slab. Background technique [0002] With the rapid development of manufacturing industry and science and technology, higher requirements are put forward for the internal quality of the slab. The central looseness and central shrinkage cavity are the main factors restricting the internal quality of the continuous casting slab. In order to further improve the central density of the slab, a solidification end is proposed. Technology under heavy pressure. The heavy reduction technology at the end of continuous casting solidification is to make full use of the characteristics of large temperature difference between the surface and core of the slab at the end of the slab solidification (the core temperature of the slab is high, and the center temperature...

AI Technical Summary

Problems solved by technology

On the other hand, the single-roll large reduction in the roughing mill form cannot control the rebound deformation of the slab after reduction, and due to the existence of the temperature gradient inside and outside the slab, the heat shrinkage of the core of the slab during the gradual cooling of the slab The rate is significantly higher than the surface of the slab, so the core of the slab will continue to produce porosity

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