LU80479A1 - METHOD AND DEVICE FOR COOLING METAL GOODS - Google Patents

Description

A 539 ι

Patent application

Applicant: A R B E D S.A.

Avenue de la Liberté 'LUXEMBOURG

Method and device for cooling metal goods

The present invention relates to a method and an apparatus for the controlled cooling of warm metal material, in particular forgings, slabs and the like.

It is necessary to subject forgings, slabs and generally heavy metal goods to a controlled cooling after the last deforming treatment.

Here, the greatest value is placed on a slow and evenly distributed temperature drop through the metal material, and it is generally important to prevent or at least prevent the formation of a temperature gradient between the core of the metal material and its outer walls to keep within tolerable limits, which is easy to see, and more difficult with increasing mass of metal.

• For controlled cooling, it is known that the metal material in so-called

Introduce cooling pits in which the individual pieces are placed and the pits are then filled with refractory sand and covered with metal sheets.

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This takes a certain amount of time, even if the sand is not brought into the pits by means of shovels but by mechanical conveyors, during which part of the surface of the metal remains unprotected and radiates heat.

Furthermore, it cannot be guaranteed with this mode of operation that the entire metal surface is surrounded by sand, which counteracts uniform cooling.

Finally, the removal of the metal goods after the more or less uniform cooling has taken place is very lengthy. In fact, the top layer of sand must first be progressively removed from the cooling pit until it is possible to grasp the metal material with a lifting device, then the pit must be largely emptied with a view to the next loading.

The aim of the present invention was therefore to propose a method and a device for the controlled cooling of heavy metal material, the aforementioned disadvantages v 'of the conventional cooling pits being excluded.

According to the invention, this object is achieved in that warm metal material in a container is surrounded by a given amount of a granular or powdery insulating material, the insulating material in the container being brought into a fluidized state by means of a gas stream for the purpose of introducing the metal material, whereby the metal material can be introduced into the container without resistance, and that after the container has been loaded, the introduction of the gas flow is interrupted, the insulating material being compactly deposited around the metal material.

The invention also provides for the insulating material. to be converted into the fluidized state before the metal material is discharged.

According to an advantageous embodiment of the method according to the invention, at least part of the insulation material can be pneumatically fed or removed from the container during fluidization, in the course of the introduction or removal of the metal material.

The amount of the insulation material located within the container after the fluidization has been interrupted is such that the warm metal material introduced is completely immersed in the insulation material.

The possibility of pulling off or feeding in a part of the insulation material is useful both in the course of the application and also the dispensing of the metal material. When unloading, enough insulation material can be removed from the container to create sufficient gout conditions for the crane operator. When loading the container, as much insulation material can be returned according to the volume of the container loading that the metal material is completely covered.

The advantage achieved by the method according to the invention is that the warm metal material is completely introduced into a bed formed from a pourable insulating material. The measure of the fluidization of the insulating material during the introduction of the metal goods into the container brings in turn two advantages. In the first place, when fluidizing within the container, a dynamic medium is created, into which the metal material is immersed without difficulty when it is introduced, so that it can be deposited in the container without any obstacle. Secondly, the metal material, of the same shape, is washed around on all sides by insulating material, so that after the fluidization has been terminated, an insulating jacket is placed around the metal material, which has the same density and constant heat transfer everywhere. has coefficient.

Of the insulating materials in question, porous vermiculite is preferably used. When choosing the insulation material, preference is given to a low density, a favorable average grain size, a high heat transfer coefficient and high abrasion resistance.

Any gas or gas mixture which does not react with the warm metal or with the insulating material under the given conditions can generally be used to fluidize the insulating material. In the controlled cooling of bulk steel, air can easily be used as the fluidization gas.

In any case, it should be noted that in view of the advantages offered by the method according to the invention, neither the production costs of the insulation material, of which only a relatively small amount is required if the available space inside the container is used efficiently, nor the operating costs for the fluidization, which is yes takes place only in the course of the introduction or discharge of the metal goods, significant weight.

A device according to the invention suitable for largely controlled cooling of warm metal material particularly understands a container provided with a movable roof part, which is preferably made of steel and is characterized in that it has at least one formed from a layer of a refractory material and provided with a support for the metal material Understands the floor, in which several gas inlets, preferably in the form of gas-permeable plates, are embedded, as well as a gas channel system arranged under the floor.

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The preferred gas-permeable plates can consist of porous, temperature-resistant sintered stones, of sintered metal or of finely perforated interchangeable sheets, or pipes made of temperature-resistant steel.

. The supports arranged at the bottom of the container generally consist of elevations running in the transverse or longitudinal direction, which are arranged on both sides of the gas-permeable plates and protrude above them. These preferably metallic supports for the metal material to be cooled prevent the metal material from coming into direct contact with the gas inlets and from damaging them. The pads can consist of rails, beams or other profiled iron or of refractory stones.

The gas channel system, which is connected to the gas inlets, can be designed as a stiffening of the bottom of the container.

According to a preferred embodiment of the device according to the invention there are at least one pneumatic fine material conveying unit and at least one storage chamber in the immediate vicinity of the container, the pneumatic fine material conveying unit being connected on the one hand to the container and on the other hand to the storage chamber.

The drawing schematically illustrates a preferred embodiment of the device according to the invention. 1 shows a section through the device according to the invention in the loaded state and without fluidization.

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As shown in Fig. 1, the steel container (20) is largely embedded in a recess (10). Several forged rollers (60) are located in the container (20).

The base plate (21) of the container (20) is covered with a refractory concrete layer (22) in which porous gas-permeable plates (23) are embedded.

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The rails (24), which sit on the container base (21) and run on both sides of the plates (23), serve as a direct or indirect support for the rollers (60), so that the plates (23) are not touched by the rollers (60) will.

The gas duct system (30), which is connected to the gas connection piece (31), is located below the base plate (21).

The container (20) shown has a horizontally movable roof (25).

As can be seen, the insulating material (50) surrounds the rollers (60) on all sides. Apart from the refractory concrete layer (22), the container shown has no further insulating clothing. However, the walls and the lid of the container can additionally be provided with such insulation clothing.

Claims (15)

1. A method for the controlled cooling of warm metal material, in particular forgings, slabs and the like, characterized in that warm metal material in a container is surrounded by a given amount of a granular or powdery insulating material, the insulating material in the container for the purpose of insertion of the metal material is brought into a fluidized state by means of a gas stream, as a result of which the metal material can be introduced into the container without resistance and that after the container has been loaded, the introduction of the gas stream is interrupted, the insulating material being compactly deposited around the metal material. 2. The method according to claim 1, characterized in that a further fluidization of the insulating material is carried out before the metal material is discharged. 3. The method according to claims 1-2, characterized in that during the fluidization, in the course of the input or. * Application of the metal material, at least a part of the insulation material feeds or removes the container pneumatically. 4. The method according to claims 1-3, characterized in that the amount of the insulating material located in the container is dimensioned such that the introduced warm metal material is surrounded on all sides by insulating material after the introduction of the gas flow has been interrupted. - 3 - 5. The method according to claims 1-4, characterized in that porous vermiculite is used as the insulating material. 6. The method according to claims 1-3, characterized in that a gas or gas mixture is used for fluidizing the insulating material, which under the given conditions does not react significantly with the warm metal or with the insulating material. i 7) Device for performing the method according to claims 1-6, which in particular understands a container, preferably made of steel, and is characterized in that the container is at least one formed from a layer of a refractory material and provided with a support for the metal material Has floor, in which several gas inlets, preferably in the form of gas-permeable plates are embedded, and a gas channel system arranged under the floor. 8. The device according to claim 7, characterized in that the gas-permeable plates are porous, temperature-resistant sintered stones. 9. The device according to claim 7, characterized in that the gas-permeable plates consist of porous, temperature-resistant sintered metal. 10. The device according to claim 7, characterized in that the gas-permeable plates consist of finely perforated sheet of temperature-resistant steel. 11. The device according to claim 7, characterized in that the gas-permeable plates consist of perforated tubes. 12. Device according to claims 7-11, characterized in that the plates are interchangeable. 13. Device according to claims 7-12, characterized in that the bottom of the container has transverse or longitudinal - 9 - elevations, which are arranged on both sides of the gas inlets and protrude above them. 14. Device according to claims 7-13, characterized in that the gas channel system is designed as a stiffening of the bottom of the container. 15. Device according to claims 7-14, characterized in that there are at least one ’pneumatic fine material conveying unit and at least one storage chamber in the immediate vicinity of the container, the pneumatic fine material conveying unit being connected on the one hand to the container and on the other hand to the storage chamber. c