Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1996-07-22
1998-04-21
Lin, Kuang Y.
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164479, B22D 1106
Patent
active
057408521
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a conveyor belt of a continuous strip-casting device for casting strips of metal, particularly steel. The belt is guided in a driven drum and by a drum horizontally adjacent to it and displaceable for tensioning of the belt. The belt rests in this connection on a support arranged between the drums and the side facing away from the cast strip is cooled.
2. Description of the Prior Art
Such a conveyor belt is known, for instance, from of German reference DE 34 23 834 C2, in which a metal strip is conducted over support rolls and cooled on the surface thereof facing away from the cast strand. In this case the metal strip is conducted around a plurality of support rollers at least one of which serves as a tensioning roller for the metal strip and at least one of which is driven in rotation. Upon the impingement of the molten metal from the supply container which is open on the bottom, the conveyor belt is heated so strongly on the side facing the cast strand as to produce distortions which extend into the cast strand and deform it. The bulges thus produced reach dimensions perpendicular to the plane of the conveyor belt which are of the order of magnitude of the thickness of the conveyor belt and a multiple thereof. These bulges may reach dimensions in the plane of the conveyor belt of 10 to 20 times the thickness of the conveyor belt and can have a size in the plane perpendicular to the direction of the conveyor belt of 0.8 to 0.9 times the width of the cast strand.
German DE OS 27 09 540, discloses a process and an apparatus in which cast strips are cooled by a cooling liquid from the side facing away from the pouring chamber. In this connection the cooling liquid produces hydrostatic forces which act on the rear of the cast strip, prevent distortion of the cast strip in the region of the pouring chamber and hold and guide the strip in a predetermined position. For this purpose, at a slight distance behind the cast strip there is arranged a guide plate which has feed and discharge openings through which cooling liquid flows onto the rear of the cast strip and cools it over its entire surface. Thus, a positive and negative hydrostatic pressure field are produced with respect to the atmosphere surrounding the strip so that the cast strip assumes a certain distance from the guide plate and is therefore held and guided in stable manner over the entire surface of the pouring chamber.
The thickness of the cast strips is between 0.5 and 2 mm. The proposed device is used in connection with downwardly inclined casting devices in which a relatively high pressing results on the ingot strips and their supports in the deep molten-metal phase in the cast material as a result of the metallostatic pressure.
In the absence of such a strong opposing pressure, for instance in continuous strip-casting devices with cast strands conducted horizontally on conveyor belts, there will continue to be clear distortions in view of the low weight of the cast strand.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an easily maintained conveyor belt which, while having a long life, avoids by simple means quality defects in the cast strand which are caused by undulated distortion of the conveyor belt in the macro range.
Pursuant to this object, and others which will become apparent hereafter, one aspect of the present invention resides in a conveyor belt for a continuous strip casting device for casting a strip of metal, which conveyor belt includes an outer side on which the strip of metal can be supported and an inner side that faces away from the cast strip. A plurality of uniformly distributed blind holes are provided in the inner side of the belt. The blind holes are separated by webs having a minimum width so that a total surface area of the webs is 0.15 to 0.4 times the total surface area of the belt. Each of the blind holes has a bottom with a wall thickness that bulges less than 1 mm upon heating of the web by the c
Feuerstacke Ewald
Freier Paul
Koch Frank
Koch Joachim
Reichelt Wolfgang
Lin Kuang Y.
Mannesmann Aktiengesellschaft
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