A combined water-cooled casting mold with directional solidification and zone-selective cooling of slabs

Abstract

The invention relates to a combined type water-cooled casting mould integrating directional casting blank solidification and selective area cooling. By the adoption of the combined type water-cooled casting mould, from-bottom-to-top forced cooling and directional solidification of a casting blank are achieved, the situation that columnar crystals grow in the direction perpendicular to the wall of the mould and the situation that because the columnar crystals which grow in a non-directional manner are overdeveloped, the columnar crystals grow in the direction perpendicular to a base plate are avoided, the problems of central shrinkage porosity and V-shaped segregation are eliminated, a large-piece-weight cast-forged blank with grain being refined, grain size being uniform in ultrasonic testing and a solidification structure being compact, uniform and free of lacks is obtained, and the ultrasonic flow detection yield is improved; the upper half portion of a casting mould body is of a hollow heat-preservation structure; a cooling water channel and a base plate water cooler on the lower half portion of the casting mould body can conduct segmented selective cooling on different areas of the casting mould; establishment of a one-dimensional temperature field and the achievement of high cooling intensity are both considered; most of sensible heat and most of latent heat of the cast blank are conducted from the base plate, and therefore directional solidification is achieved; and a hot feeding riser is adopted, a molten glass layer, a heat generating agent layer and a covering layer which are arranged in the hot feeding riser enable a shrinkage cavity area to be mainly concentrated on the hot feeding riser, the solid height in the hot feeding riser is increased, and the ratios of a top crop and a back-end crop of the cast blank are reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgical casting, and in particular relates to a combined water-cooled casting mold with directional solidification and region selective cooling. Background technique [0002] The near-net-shape continuous casting slabs of non-ferrous and ferrous metals have developed rapidly due to their advantages in production efficiency, yield, product quality, automation, energy saving and emission reduction. In recent years, the integration of casting and rolling processes Twin-roll casting technology is a typical representative, and the continuous casting ratio has become one of the indicators to measure the level of continuous casting technology and the manufacturing capacity of continuous casting equipment in various countries. Under the metallurgical environment, the trend of heavy continuous casting and light mold casting has formed in various countries. The proportion of mold casting research and applicat...

AI Technical Summary

Problems solved by technology

However, increasing the cooling intensity alone can only increase the cooling intensity, and the directional solidification may be terminated, which cannot completely improve the internal quality of the slab

Chinese Patent Publication No. CN102161079 A discloses a combined casting mold with water-cooled chassis and surrounding water-cooled movable molds, and adopts large reduction technology to eliminate air gaps, and effectively improves and eliminates shrinkage porosity, segregation and shrinkage cavities in the center of wide and thick slabs. Round blanks cannot be molded with the help of surrounding dynamic molds and large reduction technology

[0005] Improving the cooling intensity and side wall insulation are opposite to each other. At present, there is no experience and design to unify the two. Therefore, it is necessary to design a bottom-up directional solidification of the round billet under the condition of rapid forced cooling, and finally obtain a dense Alloy material with structural structure and excellent performance

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