SU1445851A1 - Method of producing multiple ingots - Google Patents

Abstract

The invention relates to foundry, in particular, to the technology for producing multi-layer and bimbyal ingots. The purpose of the invention is to improve the quality of the ingot. This - the goal is achieved by removing the partition 3 from the mold 1 with the metal lifting speed in the peripheral cavity of the mold I at the time of filling the central cavity with the metal to a level equal to 0.2-0.4 of the ingot height. The implementation of the invention allows for a reliable connection of the layers in the multilayer preform. - I il.

Description

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The invention relates to foundry, in particular, to technology for producing multi-layer and bimetal ingots.

The purpose of the invention is to improve the quality of the ingot.

The drawing shows a scheme for implementing the method.

Figure 1 is installed on a pallet 2 with three siphon metal feeds. On the pallet. 2 coaxially install the internal mold 3 "The metal of the middle layer is poured into the internal mold 3, liquid slag is applied onto the surface of the surface using exothermic mixtures or other means. During the process, the solidification of the metal begins metal. When the level 0 is filled with metal, the ingot height begins to move the inner mold 3 upwards and pour the metal into the cavity between the inner 3 and outer mold G. The conditions for forming a crust of the hardened metal from the inner mold 3 are chosen so that a liquid metal column would not collapse, and it would cause its excessive cooling below a certain temperature,

The poured metal of the outer layers, the sub-float of the partially solidified metal crust of the middle layer melted with it, forming a strong connection.

By using a water-cooled or uncooled mold, it is possible to adjust the thickness of the crust of the hardened metal of the middle layer, which allows changing the technology for producing multi-layer slabs of different weights,

If you start raising the inner grinder before filling the metal with a level of 0.2 of the ingot height, the layer crystallizes the metal, insufficient strength is formed, which leads to the melting of the hardened metal and mixing of the cast metal, and if the inner mold begins to rise after filling To metals of level 0.4 of the height of the ingot, the temperature of the solidifying metal decreases so much that the heat of the poured metal is not enough to melt it, the fusion of metals occurs over the entire surface.

Consequently, the optimal interval for filling the inner mold with the metal lies within the limits of 02-0.4 of the ingot height. The speed of upward movement of the inner mold and the completion of the cavities of the mold should be equal or close.

If the speed of the mold rise exceeds the rate of filling the extreme cavities, then the solidified metal crust, not isolated by metal and slag from the atmosphere, is oxidized and the oxide on the film prevents fusion. If the rate of metal filling in the extreme cavities exceeds the rate of filling the inner mold, then the internal mold during the pouring of the metal is deeply immersed in the metal, there may be a probability of melting of the cooled ELEMENT and the danger of the coolant contacting

This method is acceptable for casting billets weighing more than 1 ton, since there are no observed regularities near the volume of the metal.

The invention allows, through the use of an internal mold, to ensure reliable quality of the joining of the layers in a multilayer preform.

Claims (1)

Invention Formula The method of obtaining a multilayer ingot, inclusions, installation in the ingot mold of the partition, pouring of its two cavities with a shift in time, melt and removing the partition with the speed of raising the melt in the second cavity, characterized in and the removal of the partition from the mold begins at the same time as the first cavity is filled with melt - to a level equal to 0.2-0.4 of the height of the ingot.