Device and method for improving product quality through interior ultra-cold nucleation of molten metal

Abstract

The invention provides a device and method for improving the interior quality of a casting blank through removing of the superheat degree of molten metal in the casting process and generating of a large number of free isometric crystal nucleation cores in the liquid phase to homogenize casting blank solidification. By means of the device and method, the superheat degree of the molten metal can be obviously reduced, and the ultra-cold degree is formed in part of the casting blank liquid phase so that a large number of isometric crystal nucleation cores can be generated; meanwhile, the multiple isometric crystal nucleation cores move into the liquid phase of the center of the casting blank in a vibration mode, a rotation mode and other modes to enable the interior of the casting blank to be rapidly and evenly cooled and improve the interior quality of the casting blank, and accordingly the requirement for the quality of special fracture surfaces (the interiors of large continuously-cast circular blanks and large casts), special steel grades (silicon steel, automobile plates and the like) and the like can be met. According to the device and method, repeated utilizing can be achieved, equipment cost and the using and maintaining cost are low, and the production cost cannot be increased basically while the interior quality of the casting blank is improved.

Description

technical field [0001] The invention relates to the field of metal solidification such as continuous casting and die casting, and more specifically relates to a device and method for improving the internal quality of a slab by directly eliminating the superheat of molten metal and generating equiaxed crystal nucleation cores through internal strong cooling. Background technique [0002] Here, continuous casting is taken as an example to describe the technology and embodiments, but the present invention and method are not limited to the continuous casting process, and are obviously suitable for continuous casting, die casting and other fields of solidification of iron and steel or other metals. [0003] In the continuous casting process, such as figure 1 As shown, the molten steel passes through the crystallizer 3 from the ladle 1 and the tundish 2 for cooling and crystallization once, and then forms a solidified shell, with a casting slab 100 of molten steel in the center, w...

AI Technical Summary

Problems solved by technology

However, on the one hand, the implementation of this technology needs to transform the traditional tundish structure, which consumes a lot of electric energy and pollutes the environment with noise; The superheat of molten steel cannot be reduced indefinitely. When it is lower than a certain superheat, it is easy to cause flocculation at the outlet of the tundish, resulting in single-flow broken pouring or even casting machine shutdown accidents.

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