SU1555047A1 - Arrangement for working metal - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to the production of ingots with forced mixing of metal in the profits by the method of pulsation mixing. The purpose of the invention is to reduce gas consumption, metal losses and improve the operating conditions of the device. The heat insulating cover is made in the form of a receiver, mounted on a profitable extension of the mold and has a spiral square cavity with a side equal to 0.60 ... 0.65 of the diameter of the refractory pipe, the length of the spiral is 15 ... 20 heights of the refractory pipe. The channels connecting their internal volumes, which are separated from each other at a distance of 2.0 ... 2.2 heights of the refractory pipe, are made between adjacent turns of the spiral. The working gas is supplied to the outer turn of the spiral receiver 2 and fills the entire volume up to the distribution valve 4. When the cavity of the receiver 2 joins the cavity of the refractory pipe 5, the working gas pushes the metal from the refractory pipe 5 into the melt 7. When the cavity of the pipe 5 connects to the atmosphere The refractory tube 5 is refilled with metal. The gas flowing through the turns of the helix receiver 2 is gradually heated and supplied to the pipe 5 with an elevated temperature. 1 il.

Description

The invention relates to ferrous metallurgy, in particular to the production of ingots with forced mixing of metal in the profits by pulsating mixing.

The purpose of the invention is to reduce gas consumption, metal losses and improve the operating conditions of the device.

FIG. 1 shows a metal treatment apparatus; FIG. 2 is a section A-A in FIG.

The device contains a heat-insulating cover 1, in which a spiral-shaped receiver 2 with channels 3 is placed, and a distribution valve 4 is installed on top, which sequentially connects the internal volume of the refractory tube 5 with the internal volume of the receiver and the atmosphere. The device is mounted on a profitable extension 6 in which the liquid metal 7 is located.

The device works as follows.

The working gas under overpressure is supplied to the outer turn of the helix of the receiver 2 and fills its entire volume to the distribution valve 4. When the valve is in position connecting the internal volumes of the receiver 2 and the refractory pipe 5, the gas pushes the metal out of the pipe 5 deep into the melt 7 o The level of the metal in the pipe 5 decreases to its lower cut, not allowing gas to break out of the tube. When the internal volume of the refractory tube 5 is connected to the atmosphere, the gas is vented and the metal level in the profitable adapter 6 is leveled. In the following, the cycle repeats. At the same time, the working gas, the passage through the coils of the spiral in the heat insulating lid 1, is gradually heated by the heat emitted by the mirror of the molten metal 7. During one gas cycle, it is consumed as much as it is between two adjacent channels 3.

In the peripheral turns of the helix, the temperature is lower, since the helix can come into contact with the colder profitable extension and also be shielded with a layer of solidifying metal. The gas reaches the highest temperature in the inner turns of the helix, which are above the hottest metal in the axial zone of the ingot.

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Example, process ingots weighing 45 tons. Steel grade 40XH. Profit is round, height 1 OOP mm, diameter of metal mirror 1145 mm. After the metal is poured into the insulating, the device is mounted on a profitable extension. In this case, the refractory tube is immersed in the liquid metal. The material of the refractory tube is graphite-chamotte, inner diameter (50 mm. Argon is used as the working gas, the treatment time is one hour. The processing frequency, which provides the maximum amplitude of metal level fluctuations in profit, is 0.36-0.43 Hz As studies have shown, the ration range of heating temperatures of the working gas of 700-800 ° C is rational. The heating temperature of the gas less than 700 ° C does not significantly reduce the gas flow rate and increase the degree of reliability of the device’s operation. Increasing the heating above 800 ° C leads to output and Distribution valve.

Thus, heating of the working gas in the receiver is achieved. When the gas is heated, its volume increases, which makes it possible to reduce its consumption by a factor of 2-3 compared with cold gas. At the same time, the preheated gas significantly improves the operating conditions of the device, since it eliminates cooling of the metal meniscus in the pipe. As a result, the metal freezes on the walls of the refractory tube inside and outside and overgrowing of the pipe4 is reduced. This leads to normal gas flow and metal movement.

Claims (1)

Invention Formula A metal processing device comprising a mold, a profitable extension, a refractory tube placed in the cavity of a profitable extension, a control valve connecting the cavity of the refractory tube to the gas outlet and supply pipelines, and a heat insulating cover located on the profitable extension, characterized in that in order to reduce gas consumption, metal losses and improve the operating conditions of the device, the heat insulating lid made in the form of a receiver having a spiral cavity with coupled channels between the adjacent turns, the turns of the spiral in cross section have the shape of a square with a side, a refractory diameter of 0.60-0.65 555047b pipes, the total length of the spiral turns is equal to 15-20 heights of the refractory tube, and the connecting channels are located at a distance from each other at a distance of 5 equal to 2.0-2.2 heights of the refractory tube. FIG.