RU25438U1 - DEVICE FOR CONTINUOUS CASTING OF ALUMINUM AND ALLOYS Billets - Google Patents

Description

Device for continuous casting of aluminum and alloy billets

V22D 11/04

The utility model relates to foundry of metals and alloys, in particular, to devices used for continuous casting of workpieces and combined with rolling mills.

The closest technical solution is the installation for casting blanks, containing a wheel in the form of two disks and a bandage with an annular trapezoidal groove, around the circumference of which an endless tape, a water collector, nozzles connected to nozzle blocks for supplying water, an idle pulley for tensioning the tape, a roller for clamping it to the surface of the bandage and a bowl for receiving molten metal / 1 /.

The disadvantages of the known device are its narrow technical capabilities that do not allow to obtain blanks with a cross section of 300-500 mm

The objective of the proposed utility model is to expand the technical capabilities of the device.

The task is achieved in that in a device for the continuous casting of billets of aluminum and alloys, including a casting wheel in the form of two disks and a bandage with an annular trapezoidal groove, around the circumference of which there is an endless belt, a water collector, nozzles connected to nozzle blocks for water supply idler pulley for tensioning

tapes, a roller for pressing it against the surface of the bandage and a bowl for receiving the melt, a new feature is that a drain chute is made in the wall of the bowl for receiving melt and the bowl is mounted on a metal nozzle with a channel connecting the cavity of the bowl with an annular groove, while the nozzle is equipped with a valve , overlapping the annular groove around its circumference outside the line of contact of the endless tape of the surface of the bandage. A heat-insulating refractory bushing is installed in the nozzle channel with a protrusion entering the annular groove and forming a cavity with the groove surface that is closed from the side opposite to the direction of rotation of the casting wheel. The nozzle valve may be made of fibrous refractory material or cast iron.

To obtain billets with a cross-section of 300-500 mm during continuous casting on a rotary mold, it is necessary to supply melt into the annular groove with a low mass flow rate, the control of which is very difficult to control, which leads to casting of metal under the edges of an endless tape in contact with the bandage, which hardening cause deformation of the latter. In the proposed device, the melt enters the receiving bowl and through the channel into the groove of the bandage, while the valve that the nozzle is equipped with and which closes the ring about the groove outside the tangent line of the endless band in the bandage does not allow the metal to overflow over the edges of the groove and form smudges under the band . When the bowl is overfilled with metal, a drain trough made in the wall of the bowl, by dumping the excess metal, stabilizes the metal-static pressure and thereby facilitates the regulation of its flow rate. To eliminate leakage

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metal from under the nozzle, it is pressed to the bandage with a screw with an effort to ensure the sliding of the bandage relative to the nozzle. To prevent the onset of solidification of the metal in the channel of the metal nozzle, it provides for the installation of a heat-insulating refractory sleeve, the protrusion of which enters the annular groove and closes the channel, which prevents the metal from flowing in the direction opposite to the rotation of the wheel. To avoid valve breakage as a result of freezing of metal on its surface as a material from which it is made and a refractory material with fibrous filler or cast iron can be used.

Thus, the proposed device, unlike the known one, expands the technological capabilities by providing

stability of the process of obtaining blanks with a cross section of 300-500 mm

The proposed device is illustrated in the drawings, where: In FIG. 1 shows a general view of the device; In FIG. 2 - section along BB; In Fig.Z - view B; Figure 4 is a section aa;

The proposed device consists of a casting wheel 1 in the form of two disks and a brace 2 with an annular trapezoidal groove 3, around the circumference of which an endless belt 4 is installed. A stationary water collector 5 is installed on the axis of rotation of the casting wheel 1. Water is supplied through nozzle blocks 6 to nozzle blocks 7 for cooling bandage 2 on four sides along the entire path of the metal. The endless tape 4 is pressed by the roller 8 to the bandage 2 and moves due to friction forces. The idle pulleys 9 are mounted so that the endless belt 4 moves smoothly without

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distortions and with constant tension. The liquid metal enters the receiving bowl 10 with a drain chute 11. In front of the pressure roller 8, a metal nozzle 12 is mounted under the bowl 10, pressed by a screw 13 to the bandage 2 with a channel 14 connecting the cavity of the bowl 10 with an annular groove 3, equipped with a valve 15. In the channel 14 a sleeve 16 is installed with a protrusion that enters; it forms into the annular groove 3 and forms a cavity 17 with the surface of the groove 3. The device operates as follows.

Liquid metal from the furnace or ladle enters the receiving bowl 10 connected to the metal nozzle 12, pressed to the bandage 2 by a screw clamp 13, through the channel 14 in the nozzle 12, lined by the sleeve 16 into the annular groove 3 of the bandage 2. In this case, excess metal is drained through the drain trough 11 in the bowl 10 and a predetermined metallostatic pressure is set no more. The casting wheel 1 is driven into rotation at a given speed, the metal fills the annular groove 3, passes under the valve 15, which keeps the metal from overflowing over the edge of the bandage 2 and hardens in the form of a workpiece when it enters the cooling zone. The resulting continuously cast billet is sent to a rolling mill to produce long products.

The proposed device, unlike the known one, allows casting blanks of small sections, which leads to the use of less powerful rolling equipment, a decrease in the energy intensity of the technological process and an increase in its technical and economic indicators.

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Claims (3)

1. A device for the continuous casting of billets made of aluminum and alloys, including a casting wheel in the form of two disks and a bandage with an annular trapezoidal groove, around the circumference of which an endless belt, a water collector, nozzles connected to nozzle blocks for supplying water, an idle pulley for tensioning are installed tapes, a roller for pressing it against the surface of the bandage and a bowl for receiving melt, characterized in that a drain trough is made in the wall of the bowl and the bowl is mounted on a metal nozzle with a channel connecting the cavity of the bowl with an annular groove, wherein the nozzle is provided with a valve overlapping the annular groove in its circumference outside the line of contact of the endless ribbon of the surface of the bandage.  2. The device according to claim 1, characterized in that a heat-insulating refractory sleeve is installed in the channel with a protrusion included in the annular groove and forming a cavity with the groove surface closed from the side opposite to the rotation direction of the casting wheel. 3. The device according to claim 1, characterized in that the nozzle valve is made of fibrous refractory material or cast iron.