SU558748A1 - Method for continuous casting of metals - Google Patents

Description

one

This invention relates to metallurgy, in particular (Cutie for continuous casting of metals.

It is known (this method of wrinkling targets is limited to reducing the rate of pulling at the end of casting.

There is also a known method for reducing grudgy cutting, which means that at the end of casting, the ingot is removed from the mold with poppy seeds (the maximum permissible rate is in the secondary cooling zone, where under the action of water jets, the flat edges of the billet are compressed, reducing the head volume of the workpiece. Since a smaller amount of liquid metal is required for shrinkage compensation, the size of the head shrinkage shell is reduced in a reduced volume.

However, this method only has an effect on flat hogging of high-elastic steel grades.

In the case of casting, square or round gray billet having a rigid profile, or ori casting of mapoplastic steels and: alloys, the known method is not valid.

Target 10 invented is Stimulated Shrinking Scallop.

This is achieved by the fact that the ingot after the end of the casting is held in the crystallizer for a time of 0.05-0.2 of the time the ingot is completely cured, then is brought upwards from the installer to a height of 0.2 to 3.5 diameters ( thick) ingot, for 0.2 - 0.6 of the time of complete solidification of the slice is heated by an external heat source.

During the holding time of the ingot in the crystallizer, which is 0.05-0.2 times the temporal solidification, a solidified ingot shell is formed, capable of preserving its shape and withstanding the hydrostatic pressure of the melt. The lower limit of exposure relates to large seschga ingots hardening for a long time (several tens of minutes). Within 2-3 minutes, a shell of sufficient thickness is formed. The upper section refers to small sections of ingots that harden for a few minutes. Specific parameters for withdrawing the slab up from the mold to a height of 0.2-3.5 diameters (thicknesses) of the ingot are determined by paloschic characteristics of the metal to be expanded and the casting speed. the casting of metal with iizka teplopras oshyustiyu (for example, in-key

alloys) at high speed, which causes the formation of a deep hole of the liquid metal, requires a large amount of metal to feed.

The ingot is from the mold to a large height of 3.5 diameters. When casting metal with high thermal conductivity (e.g., copper alloys) at low speed, a smaller amount of metal is required to feed shrinkage and, therefore, the ingot is removed from the mold to a lower height.

The ingot is entered from the crystallizer upwards by the existing drive of an unsatisfied drink, since the cages and traverses for displacement of the ingot have a stroke both downwards and upwards, which is necessary for bringing seed into the crystallizers. Special equipment for feeding the ingot up is not required.

The head section is heated by an external heat source, which can be gas or plasma burners, electric heaters, etc. The heating time is 0.2-0.6 times the ingot full solidification time. The increase in this time is impractical due to the small amount of residual liquid phase. Shorter times are impractical because of insufficient compensation for the shrinkage that occurs most intensively in the first half of the crystallization process. To increase the efficiency of heating the metal meniscus in

the crystallizer can be decanted by heat insulating or comfortably mixed mixtures. When the head of the ingot is heated, conditions are created for maintaining the metal in a liquid state and thus to compensate for the ingot shrinkage during solidification.

The application of this method of casting ensures a minimum head trimming of continuously cast billets of any material independently

from their read. Greater effect should be expected in the casting of large-diameter workpieces, the time of complete solidification of which reaches up to tens of minutes.

The economic effect, depending on the mayr of the cast metal and the section of the bogging, can be from 10 to 50 rubles / ton.

Claims (1)

The invention of the method of continuous casting of metals, including the extraction of ingot from the mold down, characterized in that, in order to reduce the depth of the head shrinkage shell, the ingot is kept in the mold for a time after the end of the casting, amounting to 0.05-0.2 times the full solidification time of the ingot, then, upward from the crystallizer, to a height of 0.2-3.5 diameters (thicknesses) of the ingot, and for 0.2-0.6 of the time of complete solidification, the ingot is heated by an external heat source.