JP2011511882A - Casting equipment with apparatus for coating on slabs - Google Patents

Abstract

  In particular, the present invention can distribute the storage tank 2 for the fluid 3 such as for liquid metal, the discharge chamber 5 coupled to the storage tank via the coupling portion 4, and the fluid 3 to a desired width 8. And a casting facility 1 with a device 7 for coating which can dispense fluid onto the moving strip 9, in this case the joint between the discharge chamber 5 and the device 7 for coating is a closed tubular It is formed as a joint 6.

Description

  The invention relates in particular to a casting installation having a device for coating a fluid such as a liquid metal on a slab, in particular according to the superordinate concept of claim 1.

  In the prior art, a horizontal casting machine is known. In this horizontal casting machine, liquid steel is guided as a fluid from a storage tank to an exhaust chamber (Ausgabekammer), from which a movable endless rotating around a roll. It is led to an apparatus for coating liquid steel on the strip.

  In this case, the liquid steel is led from the storage tank somewhat continuously into the discharge chamber, from which it is cooled, which is usually a cooled metal strip, essentially without significant height differences through the device for coating. Led to a moving endless strip. In the discharge chamber, the liquid metal is conveyed at the casting speed, cooled and thus processed into a metal strip.

  What is important is that the liquid metal to be coated of the desired casting width and thickness is coated uniformly and thinly on the moving strip, because this is otherwise a non-uniform cast metal. This is because a strip occurs. This can be done by the discharge chamber width corresponding to the desired cast strip width and then the liquid metal flowing from the discharge chamber in parallel through a device for coating on the moving strip. It is advantageous. However, this requires a wide discharge chamber, in which case different discharge chambers will be required for each strip width.

  Similarly, the coating can be effected by the width of the discharge chamber being smaller than the width of the strip to be cast, in which case the liquid metal is expanded to the desired casting width in the device for coating and thus Distributed to.

  However, in this case, the problem is that uniform thickness and distribution are not optimally achieved, resulting in disturbing thickness variations. This is also a result of heat loss of the liquid metal in the path from the discharge chamber to the moved strip, which results in an uneven casting state of the partially cooled liquid metal and the moving metal strip. On top of this, the liquid metal does not extend sufficiently and is therefore cooled unevenly. The resulting surface waves can result in a loss of quality and can basically adversely affect the value and usefulness of the final product.

  Such a device as described above is known from US Pat. This document discloses an installation for casting a metal strip having a storage tank for supplying liquid metal to a discharge chamber, in which case the liquid metal moves from the discharge chamber via an open groove. It flows over a device that spreads to coat the metal on the endless strip. In this case, the above-mentioned problems of non-uniformly cast strips arise.

European Patent No. 0962271B1

  The object of the present invention is to provide a casting installation having a device for coating a fluid such as metal on a slab, in particular reducing or completely preventing the disadvantages of the prior art.

  According to the present invention, this problem is particularly solved by a storage tank for fluids such as for liquid metals, a discharge chamber connected to the storage tank via a coupling part, a fluid can be distributed in a desired width, and Achieved by a casting facility having a device for coating fluid that can be distributed over the moving strip, wherein the connection between the discharge chamber and the device for coating is formed as a closed tubular connection Is done.

  Such casting equipment is advantageous when the tubular joint is a closed tube. Similarly, in other embodiments, it may be useful when the tubular coupling includes a plurality of closed tubes. The closed tube reduces the exposed surface of the fluid. This achieves a high degree of thermal insulation and therefore the liquid metal is not significantly cooled.

  Furthermore, it is advantageous if a plurality of closed tubes are arranged one above the other and / or side by side. In this case, in another embodiment, it may be useful if a plurality of closed tubes are arranged parallel to each other. In another embodiment, it is more effective when a plurality of closed tubes are arranged in a fan shape. This can be formed so that the tubes in the region of the end facing the discharge chamber are positioned side by side closer to the opposite end of the discharge chamber.

  With regard to fluid outflow, it is even more effective if the end profile of the at least one tube is flattened and / or widened so that an optimized outflow can be performed.

  Similarly, another advantageous embodiment is useful when the fluid or liquid metal tube inlet in the region of the discharge chamber is below the surface of the fluid or liquid metal in the discharge chamber during operation of the facility. is there.

  Advantageous developments are described in the subclaims.

  Hereinafter, the present invention will be described in detail with reference to the drawings based on examples.

1 is a schematic view of a casting installation according to the invention having a device for coating a slab with a fluid, in particular a liquid metal or liquid steel. 1 is a schematic view of an apparatus for coating. FIG. 3 is a cross-sectional view of an apparatus for coating according to FIG.

  FIG. 1 schematically shows a casting installation 1 according to the invention. The casting facility 1 preferably comprises a storage tank 2 in which a fluid such as a liquid metal 3 is generated and heated and / or liquefied or prepared. The liquid metal reaches the discharge chamber 5 via the tube 4, from which it is distributed over the device 7 for coating via the closed tube 6 to the desired width 8 and on the moving metal strip 9. Distributed. In this case, the metal strip 9 is moved around a pair of rolling mills 10 as endless strips, in which case only one rolling mill 10 is shown in FIG. Other rolling mills cannot be recognized. In this case, the endlessly formed metal strip 9 is wound around both rolling mills 10 and joined to a closed strip.

  Corresponding to the form according to the invention of the casting installation according to FIG. 1, the tube 6 is formed closed, so that the exposed surface of the fluid is reduced. To that extent, the tube is used as a thermal insulation before it is spread with a device 7 for coating and coated on a moving metal strip 9, where it is further cooled, and the hot liquid metal 3 flowing through is This provides little cooling. This gives a cast metal strip 11 that is essentially uniformly formed. By forming the closed tube 6 as a connection between the discharge chamber 5 and the device 7 for coating, the exposed surface is reduced, so that the heat loss of the flowing liquid metal is reduced. In addition, it is advantageous to form the joint as a closed tube 6 because, except for the device 7 for coating, there are few exposed surfaces that will lead to cooling or oxidation of the liquid metal. This is because the inactivation of the liquid metal 3 in the region of the closed tube 6 can be reduced.

  Furthermore, in the device according to the invention, the inlet 12 of the tube 6 in the region of the discharge chamber 5 is located below the surface of the liquid metal, so that the tube 6 is located below the level of the liquid metal during operation. It is advantageous. As a result, the surface waves generated during the inflow of liquid metal into the discharge chamber do not propagate so strongly over the liquid metal in the tube, so that the casting process is essentially unaffected by this, The cast product is also advantageously influenced by this in terms of surface smoothness. Similarly, by placing the inlet 12 of the tube in the region of the discharge chamber below the liquid level, a pressure loss occurs during flow-through, so fluid fluctuations in the tube 6 and fluid flow in the chamber 5 Advantageously, the fluid fluctuations and flows are separated as a result, so that the fluid fluctuations and flows in the tube are reduced once again. This is therefore further advantageous as this allows the volume of the discharge chamber 5 to be kept small.

  Instead of the tube 6 shown, a plurality of tubes 6 can also be used, which are arranged between the discharge chamber 5 and the device 7 for coating. For example, two or more tubes 6 can be arranged side by side and / or overlapping each other in parallel. Similarly, it is possible to provide a tube 6 arranged in a substantially fan shape.

  In the case of one or more tubes 6, it is further advantageous that there is an outflow shape of the end profile 13 that ensures a uniform outflow of the liquid metal. This can be achieved, for example, by the tube 6 being flattened at the end of the end profile 13 and / or expanded in the plane of the device 7 for coating.

  Advantageously, the tube 6 can be formed as a heat insulating tube 6, for example as a double-walled tube, so that the liquid metal flowing through the tube 6 maintains its temperature almost unaffected and the unavoidable temperature drop is minimal. It is advantageous that

  FIG. 2 schematically shows an apparatus 20 for coating, and FIG. 3 shows a cross-sectional view in this regard. The device 20 comprises a bottom 21 and two opposite side walls 22, 23. The liquid metal flows from the tube 6 through the bottom 21 to the wall 25 placed forward in the direction of the arrow R, the height of the wall 25 being sized to be lower than both side walls 22, 23. The The liquid metal then passes over the wall 25 and flows down through the opening 27 between the wall 25 and the closing wall 26, so that the flow of liquid metal is essentially redirected downward by 90 °. In this case, the closure wall 26 is formed to be oriented essentially perpendicular to the flow direction of the liquid metal relative to the bottom 21. Preferably, the closure wall 26 is sized to have essentially the same height as both side walls 22, 23 at a height observed perpendicular to the bottom.

  The side walls 22, 23 are formed so as to extend from the region 24 where the liquid metal is applied on the device 20, in the direction of both the walls 25, 26, transverse to the metal expansion direction or flow direction R. It is advantageous. In this case, the lateral restriction of the spread is performed stepwise or continuously.

DESCRIPTION OF SYMBOLS 1 Casting equipment 2 Storage tank 3 Fluid, liquid metal 4 Tube 5 Discharge chamber 6 Closed tube 7 Apparatus for coating 8 Width 9 Moving metal strip 10 Rolling mill 11 Cast metal strip 12 Inlet 13 End profile 20 For coating Device 21 Bottom 22 Side wall 23 Side wall 24 Area 25 Wall 26 Closure wall 27 Opening 28 Flow direction 29 Section 30 Area

Claims (12)

In particular, a storage tank (2) for fluid (3) such as for liquid metal, a discharge chamber (5) coupled to the storage tank via a coupling part (4), and a fluid to a desired width (8). In a casting facility (1) having a device (7) for coating and capable of dispensing and capable of dispensing fluid on a moving strip (9),
Casting installation (1), characterized in that the connection between the discharge chamber (5) and the device (7) for coating is formed as a closed tubular connection (6).   Casting installation according to claim 1, characterized in that the tubular coupling (6) is a closed tube.   Casting installation according to claim 1 or 2, characterized in that the tubular coupling (6) comprises a plurality of closed tubes.   Casting installation according to any one of claims 1 to 3, characterized in that a plurality of closed tubes (6) are arranged one above the other and / or side by side.   Casting equipment according to any one of the preceding claims, characterized in that a plurality of closed tubes (6) are arranged parallel to one another.   Casting equipment according to any one of the preceding claims, characterized in that a plurality of closed tubes (6) are arranged in a fan-like manner.   Casting installation according to any one of the preceding claims, characterized in that the end profile (13) of the at least one tube (6) is flattened and / or widened.   The inlet (12) for fluids such as liquid metal in the region of the discharge chamber (5) is below the surface of the fluid (3) in the discharge chamber (5) during the operation of the installation. The casting equipment according to any one of claims 1 to 7.   The device (20) for covering comprises a bottom (21) with side walls (22, 23), and further provided with a closing wall (26) at the end of the device (20) opposite the discharge chamber, Casting according to any one of the preceding claims, characterized in that an outflow opening (27) is provided between the closing wall (26) and the previously placed wall (25). Facility.   Casting installation according to claim 9, characterized in that an outflow opening (27) is provided in the bottom (21).   11. Casting installation according to claim 9 or 10, characterized in that the side walls (22, 23) and the closing wall (26) have essentially the same height.   12. The height of the previously placed wall (25) is lower than the height of the side walls (22, 23) and / or the closure wall (26). The casting equipment described.

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