Metal deforming – By use of roller or roller-like tool-element – With modification or control of temperature of work – tool or...
Reexamination Certificate
2000-04-18
2001-05-29
Butler, Rodney A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
With modification or control of temperature of work, tool or...
Reexamination Certificate
active
06237385
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of and a bed for cooling a rolled stock having a longitudinal axis, wherein the rolled stock is transported, during cooling, transverse to the longitudinal axis and is cooled with water having a predetermined working pressure.
2. Description of the Prior Art
An above-mentioned cooling method and a cooling bed are disclosed, e.g., in German Publication DE-OS 1 602 169.
For cooling a rolled stock in a cooling bed essentially two methods are used, namely, either a pure air-cooling or water-cooling.
Air-cooling is rather ineffective and necessitates a large width of the cooling bed. Such cooling beds are rather expensive. Further, in order to insure a uniform cooling, the rolled stock need be rotated during its transportation transverse to its longitudinal axis. During its rotation, the rolled stock even partially extends perpendicular to the cooling bed and then again is laid down.
During water-cooling, as a rule, water from spray nozzles is sprayed onto the rolled stock from beneath and/or from above. The conventional cooling can be conducted only in the rear portion of the cooling bed where coarse water-cooling does not adversely affect the quality of the rolled stock. In addition, the still wet rolled stock need be dried before entering a straightening device arranged downstream of the cooling bed.
Accordingly, an object of the present invention is to provide a method of and a bed for cooling a rolled stock which does not adversely affect the quality of the rolled stock.
Another object of the present invention is to provide a method of and a bed for cooling a rolled stock which permits us to keep the width of the cooling bed relatively small.
SUMMARY OF THE INVENTION
These and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a method for cooling a rolled stock according to which the rolled stock is air-cooled in the entrance section of the cooling bed, then spray-cooled in the middle section of the cooling bed by spraying water onto the rolled stock, and finally is again air-cooled and is air-dried in the end section of the cooling bed; and by providing a cooling bed including conveyor means for transporting the rolled stock along the cooling bed starting from the entrance section and across the middle and end sections, and a water distribution device arranged in the middle section and formed as a spraying device for producing a water mist. The term “mist” means that the water is applied to the rolled stock not in the form of jets, but rather in a form of finest water droplets in form of a mist surrounding at least partially the rolled stock. The finest droplets or atomized water particle can be obtained with appropriately formed spray nozzles, with or without compressed air.
The cooling intensity can be controlled by adjusting the operational width of the middle section of the cooling bed, and/or the quantity of water applied to the rolled stock, and/or the working pressure of the water.
When the water is sprayed onto the rolled stock only from beneath, a free access to the cooling bed from above is retained. The excess amount of water can be carried off upward by an ascending convection current.
The inventive cooling process insures mild cooling of the rolled stock. Moreover, the inventive cooling process provides for temperature equalization inside the rolled stock, in particular between the cooled bottom side of the rolled stock and its upper region. Moreover, the cooling can be conducted in as high temperature range as with splash water cooling. The residual heat of the rolled stock can be used for drying in the end region. It is not necessary any more to rotate the rolled stock as it is conveyed transverse to its longitudinal axis.
When the rolled stock is transported with a walking beam conveyor, the cooling method is particularly reliable. In this case, the cooling bed can be made particularly robust, and the bed have a long service life. However, other transporting means can also be used, e.g., rack or chain conveyors.
The inventive cooling process can be used for different sizes of rolled stocks. However, it can advantageously used for cooling medium and heavy steel profiles.
REFERENCES:
patent: 3479853 (1969-11-01), Berry
patent: 3533261 (1970-10-01), Hollander et al.
patent: 3604234 (1971-09-01), Hinrichsen et al.
patent: 5701775 (1997-12-01), Sivilotti et al.
Brown & Wood LLP
Butler Rodney A.
SMS Schloemann-Siemeg AG
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