A method and special device for bottom-casting ingot casting

Abstract

The invention discloses a method and a special device of bottom gating type ingot casting. A container is used for bottom gating and made of material equal to that of molten metal to be performed with bottom gating. The outer surface of the bottom of the container is uneven. The method includes the steps of 1) placing the special device in a chamber of an ingot mold, with the bottom of the ingot mold contacted with the chamber; the section of the special device is in consistence with or close to that of the ingot mold; 2) gating the molten metal in the ingot mold in the bottom gating manner; achieving ingot casting after solidification. The method and the special device have the advantages that the current technology is unaffected, the conventional equipment is free of improvement, construction is convenient, operation is simple, and production cost is low; the bottom gating process is stabilized in the maximum manner, secondary oxidation of the molten melt is eliminated, sedimentary cone of impurity at the bottom of the ingot is reduced, impurity content of the ingot casting is decreased, and ingot casting quality and utilization rate are increased.

Description

technical field [0001] The invention relates to a method and a special device for bottom pouring ingot casting, and belongs to the field of high temperature melt bottom pouring. Background technique [0002] Large-scale forgings are necessary raw materials for the development of national economic construction, national defense industry and modern science and technology, and are the main basic components of various large-scale and key equipment and devices. The utilization rate is low, the production cost is high, and the greater the quality of the steel ingot, the more serious this phenomenon will be. This has become an important bottleneck restricting my country from becoming a large-scale manufacturing equipment power. The quality of large steel ingots determines the quality of large forgings, and the bottom filling and solidification process of steel ingots is an important link to further remove existing inclusions in steel and avoid adding foreign inclusions. Therefore...

AI Technical Summary

Problems solved by technology

However, the problem caused by placing the mold slag at the bottom of the ingot mold first is that the strong turbulent flow of the molten steel entering the ingot mold in the early stage of pouring may engulf the mold slag at the cone angle of the ingot mold and cause slag inclusion in the ingot; when using the mold slag suspension method, the initial The speed of molten steel entering the ingot mold is very high, and strong fluctuations in the liquid level can easily expose the molten steel surface to the atmosphere to cause secondary oxidation, and the emulsification of steel slag is serious, and it is easy to form molten steel slag

In addition, at the beginning of pouring, the molten steel enters the ingot mold and easily forms splashes, which will also cause secondary oxidation of the molten steel

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