Cleaning and liquid contact with solids – Processes – With work or work parts movable during treatment
Patent
1998-10-05
2000-11-21
Gulakowski, Randy
Cleaning and liquid contact with solids
Processes
With work or work parts movable during treatment
134 34, 134172, 239251, 239264, B08B 104, B08B 302
Patent
active
061497339
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for descaling a workpiece, particularly a rolled piece, wherein the workpiece is moved past a rotor descaling device, where at least one liquid jet rotating on a rotational axis intersecting the workpiece surface to be descaled is sprayed onto the surface to be descaled, with the liquid jet being formed intermittently, i.e. with temporary interruptions, with the liquid jet being formed intermittently, i.e. with temporary interruptions, and to a rotor descaling device for implementing the process.
DISCUSSION OF RELATED ART
Rotor descaling devices are known, for example, from DE-A-43 28 303 or EP-A-0586 823 or DE-A-31 25 146. These known rotor descaling devices are equipped with spray nozzles which are located at rotating beams or rotating nozzle holders and directed towards the workpiece surface to be descaled. As a rule, the rotational axis is perpendicular to the workpiece surface to be descaled.
In this process, liquid admission patterns are formed by individual spray curves in the form of intertwined cycloids according to the relative motion between the workpiece and the rotating spray nozzles, which is dependent on the movement of the workpiece and the nozzle speed, as well as according to the number of nozzles. As a result, liquid jets are repeatedly admitted to one and the same workpiece surface. The disadvantage of this process is that the consumption of sprayed liquid is very high and, thus, the workpiece cools to a lower temperature than actually required for descaling.
A process for spraying the liquid jets onto the workpiece surface at an inclination against the moving direction of the workpiece is known from EP-A-0 640 413. According to this document, this process is implemented by covering the liquid jet over that part of its rotational motion which does no longer meet the requirement of being directed against the moving direction of the workpiece. This process also involves high liquid consumption even though no the total amount of liquid strikes the workpiece.
Rotor descaling devices of the aforementioned type are already known from U.S. Pat. No. 5,220,935 and DE-A 23 55 893, according to which liquid consumption can be reduced by applying an intermittent liquid jet. Furthermore, double admission of liquid jets onto workpiece surfaces and, thus, unnecessary undercooling of the rolled piece, particularly with a view to a subsequent rolling process, is avoided.
However, this embodiment does not yet allow optimum descaling of a workpiece at minimum liquid consumption.
A special effect of the process according to the invention is that pressure peaks occur which are caused by single or repeated interruption of the liquid jet and lead to elevated jet pressures. As a result, the descaling effect is essentially improved. The pressures of the liquid jets assume peak values amounting to a multiple of the constant jet pressures known from conventional processes. According to the invention, the impact pressures of the liquid jets on the surface of the workpiece are so high that the liquid pressure can be considerably lowered and an improved descaling effect is achieved.
SUMMARY OF THE INVENTION
The object of the invention is to avoid the described disadvantages and difficulties and to develop a process and a device for implementing the process where the effect of elevated jet pressures resulting from intermittent formation of the liquid jet is enhanced and distributed over the surface of the workpiece. Furthermore, optimum descaling at minimum liquid consumption is to be achieved. Particularly, not only a reduction of liquid consumption but also of the liquid pressure is to be achieved without any deterioration of the quality of the surfaces to be descaled.
According to the invention, this problem is solved by interrupting the formation of liquid jet twice or several times in succession, however, only for a short period of time, i.e. maximally over a liquid jet rotation of 10.degree., preferably 5.degree..
In this process, the liquid
REFERENCES:
patent: 3883075 (1975-05-01), Edney
patent: 4151808 (1979-05-01), Beck et al.
patent: 5220935 (1993-06-01), Bailey et al.
Djumlija Gerlinde
Kremmaier Karl
Oberhumer Johann
Schweighofer Andreas
Wrulich Herwig
Chaudhry Saeed T.
Gulakowski Randy
Voest-Alpine Industrianlagenbau GmbH
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