RU2471588C2 - Casting machine with feed onto casting belt - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: casting machine 1 comprises tank 3 for, in particular, liquid metal, discharge chamber 5 communicated via connection 4 with said tank, and device 7 to feed liquid metal onto moving belt 9. Liquid metal is distributed on moving belt 9 crosswise 8. Connection between discharge chamber 5 and feed device 7 is composed by closed tubular joint 6 that allows heat insulation of liquid metal. Said tubular joint 6 may included multiple closed tubes arranged in parallel or in fan-like array.

EFFECT: uniform-thickness cast strip.

11 cl, 3 dwg

Description

The invention relates to foundries with a device for supplying a fluid, for example liquid metal, to a casting tape, in particular, according to the restrictive part of paragraph 1 of the claims.

Horizontal foundry plants are known in the art where liquid steel is sent as a fluid from a reservoir to a dispensing chamber and from a dispensing chamber to a liquid steel feed device to an endless belt moving around the rollers.

In this case, the molten steel from the reservoir is more or less continuously directed into the dispensing chamber, and from there, through the feeder with essentially no large height difference, to a cooled moving endless belt, which, as a rule, is a cooled metal strip. There, the liquid metal is transported at a casting speed and is cooled and thus converted into a metal strip.

It is essential that the feed metal with the desired casting width and thickness be simultaneously and finely applied to the movable tape, since otherwise an uneven cast metal strip will occur.

Preferably this is done by the fact that the width of the dispensing chamber corresponds to the desired width of the cast strip, in which case liquid metal flows in parallel from the dispensing chamber through the feed device to the movable belt. However, this requires dispensing chambers with a considerable width, and different dispensing chambers are required depending on the respective bandwidth.

Also, the feed can be carried out by means of the fact that the dispensing chamber has a smaller width than the width of the cast strip, and the liquid metal expands and is distributed in the feed device to the desired casting width.

However, the disadvantage is that the optimum uniform thickness and distribution are not achieved and undesirable thickness deviations occur. This is also a consequence of the heat loss of the liquid metal along the path from the dispensing chamber to the movable belt, resulting in uneven casting conditions for the liquid partially cooled metal, and an insufficient amount of liquid metal is supplied to the movable metal tape and, therefore, uneven cooling occurs. The surface waves that arise in this way represent a loss of quality, which in principle can adversely affect the cost and suitability of the final product.

Similar devices described above are known, for example, from EP 0 962,271 B1. This publication discloses an installation for casting metal strips containing a reservoir for supplying a dispensing chamber with liquid metal, and from the dispensing chamber, liquid metal flows through an open trough to an expanding metal feed device to a moving endless belt. This raises the above problems of uneven casting of strips.

An object of the present invention is to provide a foundry installation with a device for applying a fluid, for example metal, to a casting tape in which the disadvantages of the aforementioned technology are reduced or even completely eliminated.

In accordance with the invention, this problem is solved by means of a foundry with a reservoir for a fluid, for example for liquid metal, with a dispensing chamber connected to the reservoir through a connection, and with a delivery device by which the fluid can be distributed to a desired width and by which it can distributed on a moving belt, and the connection between the dispensing chamber and the feeding device is made in the form of a closed tubular connection.

In the case of such a foundry, it is preferable if the tubular connection is a closed pipe. Also in the case of one other embodiment, it may be appropriate if the tubular connection includes a plurality of closed pipes. Through closed pipes, the free surface of the fluid is reduced. As a result, an increased degree of thermal insulation is achieved, due to which the liquid metal is not cooled so much.

Further, it is preferable if a plurality of closed pipes are located below and / or next to each other. Moreover, in the case of one other embodiment, it may be appropriate if the plurality of closed pipes are parallel to each other. Further, in the case of another other embodiment, it is advisable if the plurality of closed pipes are arranged relative to each other in the form of a fan. This can be done in such a way that the pipes in the region of the end facing away from the dispensing chamber are closer to each other than at their opposite end.

Further, with respect to fluid flow, it is preferable if the end circuit of said at least one pipe is flattened and / or expanded (expanded) so that optimal flow can occur.

Also, in the case of one additional preferred embodiment, it is advisable if the inlet of the pipe for a fluid or liquid metal in the area of the dispensing chamber during operation of the installation is below the surface of the fluid or liquid metal in the dispensing chamber.

Preferred improvements of the invention are described in the dependent claims.

The invention is further explained in more detail on the basis of an example implementation through the drawings, which show:

Figure 1 is a schematic representation of a casting apparatus according to the invention with a device for applying a fluid, for example liquid metal or liquid steel, to a casting tape;

Figure 2 - schematic representation of a device for applying; and

Figure 3 is a section of a device for applying according to figure 2.

1 schematically shows a foundry installation 1 according to the invention. The foundry 1 has a reservoir 2 in which a fluid, for example liquid metal 3, is preferably created, which is heated and / or liquefied or prepared. The liquid metal through the pipe 4 enters the dispensing chamber 5, from which through the closed pipe 6 it is distributed by the feeding device 7 to the desired width 8 and fed to the moving metal tape 9. In this case, the metal tape 9 moves in the form of an endless tape around a pair of rolls 10, and figure 1 presents only one of the rolls 10. Another roll cannot be seen. At the same time, the infinitely metallic tape 9 is twisted around both rolls 10 and connected to a closed tape.

According to a corresponding embodiment of the foundry installation of FIG. 1, the pipe 6 is closed so that the free surface of the fluid is reduced. In this regard, the pipe serves as thermal insulation and, as a result, the hot liquid metal 3 flowing through it almost does not cool until it is expanded by the feeding device 7 and deposited on a moving metal strip 9 for subsequent cooling. Due to this, a substantially uniformly formed cast metal strip 11 is created. By making the closed pipe 6 as a connection between the dispensing chamber 5 and the supply device 7, the heat losses of the liquid metal flowing through it are reduced, since free surfaces are reduced. In addition, it is preferable to make this connection as a closed pipe 6, since it can also save on creating an inert gas atmosphere around the liquid metal 3 in the region of the closed pipe 6, because - if you look from the supply device 7 - almost or not at all free surfaces that could lead to cooling or oxidation of liquid metal.

In addition, in the case of the device according to the invention, it is preferable that the pipe 6 with its inlet 12 in the area of the dispensing chamber 5 is below the surface of the liquid metal, so that the pipe lies below the level of the liquid metal during operation. As a result of this, surface waves that occur when liquid metal enters the dispensing chamber may not propagate so much to the liquid metal in the pipe, so that there is essentially no strong effect on the casting process, and the casting product is also thereby preferable exposure to relatively smooth surfaces. It is also preferable that due to the location of the inlet 12 of the pipe in the area of the dispensing chamber below the surface of the liquid, pressure losses occur during flow, which also help to separate the vibrations of the fluid and flows in the chamber 5 from those in the tube 6, so that the fluctuations of the fluid and flows in the pipe further reduced. Therefore, this is further preferred, since due to this, the volume of the dispensing chamber 5 can be kept small.

Instead of the pipe 6 shown, several pipes 6 can be used which are located between the dispensing chamber 5 and the feeding device 7. For example, two or more pipes 6 may be parallel to each other and / or one above the other. Pipes 6 may also be provided, which are arranged expanding, almost fan-shaped.

Further, in the case of the pipe 6 or in the case of the pipes 6, an outlet geometry of the end circuit 13 is preferably proposed which ensures uniform flow of the molten metal. This can be achieved, for example, due to the fact that the pipe 6 at the end at the end circuit 13 is flattened and / or expanded in the plane of the feeder 7.

Preferably, the pipe 6 can be made in the form of a heat-insulating pipe 6, for example in the form of a double-walled pipe, so that the molten metal that flows through the pipe 6 maintains its temperature with almost no decrease, and the inevitable decrease in temperature is preferably minimal.

FIG. 2 shows a schematic representation of a supply device 20, wherein FIG. 3 shows a corresponding section. The device 20 has a bottom 21 and two opposite side walls 22, 23. The liquid metal flows out of the pipe 6 above the bottom 21 in the direction of the arrow R to the front wall 25, which is designed in its height so that it is less significant, than the height of the side walls 22, 23. Then the molten metal overflows through the wall 25 and flows between the wall 25 and the trailing wall 26 through the hole 27, so that the flow of the molten metal deviates downward substantially by 90 °. In this case, the closure wall 26 is made in such a way that it is oriented essentially perpendicular to the direction of flow of the molten metal relative to the bottom 21. In height — when viewed perpendicularly to the bottom — the closure wall 26 is preferably made so that it has substantially the same height as and both side walls 22, 23. The side walls 22, 23 are preferably made so that they diverge from the region 24 in which liquid metal is applied to the device 20, in the direction of both walls 25, 26 across the direction of distribution roubleshooting or, respectively, the direction of flow R of the metal. In this case, the lateral limitation of the indicated discrepancy can be carried out stepwise or continuously.

List of Reference Items

1 Foundry

2 Tank

3 Fluid, liquid metal

4 pipe

5 Dispensing chamber

6 Closed pipe

7 Feeder

8 Width

9 Moving metal tape

10 Roll

11 Cast metal strip

12 Login

13 End circuit

20 Feeder

21 bottom

22 side wall

23 side wall

24 Area

25 Wall

26 Trap

27 hole

28 flow direction

29 Plot

30 Area

Claims (11)

1. A foundry installation (1) containing a reservoir (2) for a fluid (3), in particular for a liquid metal, which is connected through a connection (4) to the reservoir, a dispensing chamber (5) and a feeding device (7, 20) by which the fluid is distributed to the desired width (8) and by which it is distributed on a moving belt (9), characterized in that the connection between the dispensing chamber (5) and the feed device (7, 20) is made in the form of a closed tubular connection ( 6), and the feeding device (7, 20) has a bottom (21) with side walls (22, 23), moreover, an end wall (26) is provided at the end of the supply device (20) facing away from the dispensing chamber, and an outlet (27) is provided between the end wall (26) and the front wall (25). 2. Foundry installation according to claim 1, characterized in that the tubular connection (6) is a closed pipe. 3. Foundry installation according to claim 1 or 2, characterized in that the tubular connection (6) includes many closed pipes. 4. Foundry installation according to claim 3, characterized in that the set of closed pipes (6) is located under and / or respectively next to each other. 5. Foundry plant according to claim 3, characterized in that the plurality of closed pipes (6) are parallel to each other. 6. The foundry installation according to claim 3, characterized in that the plurality of closed pipes (6) are arranged relative to each other in the form of a fan. 7. Foundry plant according to claim 2, characterized in that the end circuit (13) of said at least one pipe (6) is flattened or expanded. 8. Foundry plant according to claim 1, characterized in that the inlet (12) for a fluid, for example, for a liquid material, in the area of the dispensing chamber (54) during operation of the installation is located below the surface of the fluid (3) in the dispensing chamber (5 ) 9. Foundry installation according to claim 1, characterized in that the outlet (27) is provided in the bottom (21). 10. Foundry according to claim 1, characterized in that the side walls (22, 23) and the closing wall (28) have essentially the same height. 11. Foundry plant according to claim 1, characterized in that the wall (25) located in front has a lower height relative to the side walls (22, 23) and / or the closing wall (26).

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