SU1282954A1 - Method of feeding molten metal to the mould of continuous casting machine - Google Patents

Abstract

The invention relates to continuous casting of metals. The aim of the invention is to simplify the regulation of the level of the metal in the mold. A gas at a predetermined pressure is supplied to a channel made in the wall of the pouring nozzle connecting the intermediate tank and the crystallizer, the channel outlet opening being located below the level of the metal in the crystallizer (K). Due to the fact that the intermediate tank is sealed, the metal level in K is in dynamic equilibrium. 1 il.

Description

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The invention relates to continuous casting of metals.

The purpose of the invention is to simplify the regulation of the level of the metal in the mold.

The drawing shows a device for implementing the method, a general view.

The device contains a sealed intermediate tank 1 with molten metal 2, a pouring glass 3 with a side opening 4 made in the wall of the glass, a pipeline 5 for supplying gas. A sealed intermediate tank is installed above the crystallizer 6, in which the stopper 7 and the lid 8 are installed for pouring liquid metal. In the drawing, the level h of the metal mirror in the mold relative to the entrance of the additional side opening to the internal channel of the pouring glass is indicated. relative to the metal mirror in the mold.

The method of feeding the metal into the mold is carried out as follows.

The intermediate tank 1 is installed above the crystallizer 6, it is heated (for steel up to 900-1200 ° C). Through the holes in the lid 8, the molten metal 2 is poured into the hermetic intermediate tank 1 with the stopper 7 closed. The holes in the lid 8 are closed and the internal cavity of the bucket is sealed. The stopper 7 is fully opened and the pipeline 5 through the additional side opening 4 serves gas under pressure

P Po + VH, (1)

where P is the pressure of the inert gas supplied;

PO - atmospheric pressure;

Y is the specific gravity of the liquid metal; h is the level of the metal mirror in the crystallizer relative to the entrance of the additional lateral opening into the internal channel of the pouring nozzle.

From formula (1) it follows that

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Thus, the level of the metal in the mold depends only on the magnitude of P, assuming that PO and Y. are constant. After the level of the metal in the crystallizer reaches a predetermined, determined by the value of P, the flow of metal into it stops as the pressure in the channel of the nozzle is equalized. Then the mechanism for drawing the ingot from the crystallizer is included. The level of the metal in the mold remains constant regardless of the speed of the ingot extrusion.

Example. Intermediate tank 1 with internal dimensions 500Х ЮООХ 400 mm. with a useful volume of 0.17 m, they are closed with a lid with a sealing flange

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KAON-1. A cover is provided in the lid for pouring metal from a casting duster with a diameter of 200 mm, which is also sealed with a lid with an asbestos gasket.

The lid is made of a seal knot of a stopper plug, the sealing of which is ensured by an omental packing of mark AP 18X 18. The pouring cup is made with an outer diameter D of 120 mm, an inner diameter of D equal to 60 mm, a length of mm, with a side opening 08 mm. into the internal channel of which is made at a distance of 60 mm from the bottom end of the pouring nozzle. The entrance of the side opening is connected to the gas supply pipe (use Ar). The gas pressure is regulated by the reduction valve P-KPO8-22 / 7, the control range of which is 0.2-4.0 kgf / cm.

The metal is fed to a copper water-cooled crystallizer 0300 mm, L 550 mm. The casting speed in the first case is 0.205 m / min, in the second - 0.656 m / min, the consumption of the liquid metal is 116 kg / min and 368 kg / min, respectively. The total length of the ingot is L 2.3 m, the weight of the ingot is 1283 kg, volume V 0.161 m1

An intermediate container is placed above the crystallizer, with the end of the nozzle being 300 mm below the upper end of the crystallizer. The intermediate tank is heated to 900-1000 ° C, and the seed is introduced into the crystallizer.

0.17 m or 1300 kg of steel 45 are poured into the intermediate tank through the lid. The casting time is 1-2 minutes. Seal the cover 1.5 min. Fully open the stopper and fed through the pipeline Ar under pressure P 0.108 MPa in the first case and P 0.098 MPa in the second case. After the metal reaches the level, calculated from the upper end of the crystal, equal to 110 mm in the first case and 235 mm in the second case, the flow of metal into the mold stops. The pull mechanism is activated. The level of metal in the casting process ranges from 110 to 115 mm in the first and from 234 to 240 in the second case. The metal level is controlled by a pneumatic device, the measurement accuracy is ± 1 mm. The flow rate Ag is not measured and not adjusted. After all the metal has entered the mold, the supply of Ar is stopped. This completes the casting. The two castings performed show the practical performance of the proposed method, with the level fluctuations of the metal being 5 mm in the first and 6 mm in the second case.

Using the proposed method of supplying liquid metal in the mold

allows to maintain a constant metal level in the crystallizer (to regulate it) without controlling the metal level both in the crystallizer and in the intermediate tank and without changing the flow cross section of the metal jet. In this case, it is possible to use pouring glasses of the maximum possible diameter, which increases the durability of the glass and reduces the rate of metal outflow into the mold. Besides.

Claims (1)

Claims The method of supplying a liquid metal into a mold of continuous casting machines, including pouring a liquid metal into an intermediate tank, sealing an intermediate tank, feeding the metal into the mold through a pouring cup, controlling the level of the metal in the mold with a gas flow, characterized in that Simplification of the regulation allows the casting of metal level from spontaneous ly to rostalisation — one intermediate tank into several. To the torus, gas is fed to a pouring cup of crystallizers with different cross sections. same level of metal in the mold. Claims The method of supplying a liquid metal into a mold of continuous casting machines, including pouring a liquid metal into an intermediate tank, sealing an intermediate tank, feeding the metal into the mold through a pouring cup, controlling the level of the metal in the mold with a gas flow, characterized in that simplify regulation