EP3074151A1

EP3074151A1 - Method and device for descaling a metallic surface and installation for producing semifinished metallic products

Info

Publication number: EP3074151A1
Application number: EP14805888.6A
Authority: EP
Inventors: Markus Cramer
Original assignee: SMS Group GmbH
Current assignee: SMS Group GmbH
Priority date: 2013-11-29
Filing date: 2014-11-28
Publication date: 2016-10-05
Anticipated expiration: 2034-11-28
Also published as: JP6302557B2; CN105916604B; WO2015079052A1; EP3074151B1; KR20160087836A; US20160303627A1; US10130981B2; DE102013224506A1; KR101834454B1; JP2016538136A; RU2637192C1; CN105916604A

Abstract

The invention relates to a method for descaling a metallic surface (2, 3) of a semifinished metallic product (4, 9), in which the semifinished metallic product (4, 9) is moved in a transporting direction (13) past nozzle head parts (18) that are arranged next to one another transversely in relation to this transporting direction (13) and rotate, and in which nozzle elements (22, 23, 24, 25) arranged on these rotating nozzle head parts (18) are used to produce on the metallic surface (2, 3) directed high-pressure fluid jets, which before hitting the metallic surface (2, 3) may touch or overlap at a constriction (30) between two directly neighbouring nozzle head parts (18), wherein the nozzle head parts (18) rotate synchronously in relation to one another with an angular position (31, 32) that is preset in such a way that the fluid jets produced by means of the nozzle elements (22, 23, 24, 25) are always directed past one another onto the metallic surface (2, 3) without coming into contact with one another.

Description

Method and device for descaling a metallic surface and plant for producing metallic semi-finished products

The invention relates to a method for descaling a metallic surface of a metallic semifinished product, wherein the metallic semifinished product in

Transport direction to transverse to this transport direction side by side

arranged and rotating nozzle head parts is guided past and arranged in which by means of these rotating nozzle head parts

Jet elements directed to the metallic surface and high pressure fluid jets are generated, which can be tangent or overlap at a bottleneck between two immediately adjacent nozzle head parts before hitting the metallic surface.

The invention also relates to a device for descaling a

Metallic surface of a metallic semifinished product with a

Nozzle device, on which the metallic semifinished product can be guided in the transport direction, in which the nozzle device to a variety of order

Rotary axes rotating nozzle head parts with nozzle elements for generating directed onto the metallic surface and high pressure fluid jets, wherein the nozzle head parts are arranged side by side, that the fluid jets generated by the nozzle elements at a constriction between two immediately adjacent nozzle head parts before

Can affect or overlap impacts on the metallic surface.

The invention further relates to a system for producing metallic semi-finished products, in particular of metallic strip material, with a device for descaling the metallic surfaces of the metallic semi-finished products. In particular, generic methods and devices are well known in the art.

For example, from the published patent application DE 43 28 303 A1 discloses a device for descaling hot rolled goods, which are guided past this device. In this case, the surfaces of the respective rolling stock are then cleaned or descaled by irradiation on both sides by means of high-pressure water. The descaling device proposed therein has nozzle heads arranged in juxtaposition in a row, which are each rotationally driven by a motor about an axis of rotation. The nozzle heads have at least one eccentrically arranged nozzle, by means of which high-pressure water jets can be generated and blasted onto the surfaces. By the

rotationally driven nozzle heads, a better surface quality of the blasted surfaces of the rolling stock is to be achieved.

From international application WO 2005/082 555 A1 is another

Device for descaling of hot rolled goods with arranged in a row nozzle heads known, which are rotationally driven in each case about a rotational axis. The descaling device taught there is distinguished by the fact that the nozzles arranged on the rotary-driven nozzle heads are arranged as close as possible structurally to the circumference of the respective nozzle head. This should be on the Walzgutoberfläche a

Spray pattern are generated, which affects the spray pattern of the nozzle head adjacent nozzle line at least in order to achieve a uniform descaling of Walzgutoberfläche across its width. In addition, adjacent nozzle heads of Düsenkopfreihe rotate in opposite directions to avoid unwanted mutual beam interference.

The invention is based on the object, the cleaning effects with respect to a Entzunderns of metallic surfaces corresponding metallic

Semi-finished to improve generic Entzunderungsvorrichtungen. The object of the invention is achieved by a method for descaling a metallic surface of a metallic semifinished product in which the metallic semi-finished product is guided in the transport direction at juxtaposed and rotating nozzle head parts transversely to this transport direction and at which by means of these nozzle elements arranged on these rotating nozzle elements on the metallic Surface-directed and high-pressure fluid jets are generated, which can touch or overlap at a bottleneck between two immediately adjacent nozzle head parts before striking the metallic surface, wherein the method is characterized in that the nozzle head parts rotate with such a preset angular position synchronously to each other , which by means of

Nozzle elements generated fluid jets are always radiated contactless past each other on the metallic surface.

Synchronous means according to the invention that once set between the nozzle head parts corresponding angular positions during the

Do not accidentally change nozzle head part rotations to each other. The risk that in particular two nozzle elements of two directly adjoining nozzle head parts are simultaneously positioned at the bottleneck in any operating phase can be completely ruled out in that the nozzle head parts are adjusted with respect to their angular positions to each other such that the fluid jets generated by the nozzle elements always, that means at least in each Entzunderungsphase, contactlessly past each other are blasted on the metallic surface.

Rotate the nozzle head parts in this case additionally synchronized with each other, it is prevented that the nozzle head parts with respect to their angular positions adjusted to each other, that this is no longer guaranteed in each significant phase of operation. Therefore, it is advantageous if the nozzle head parts of the nozzle device synchronously rotate with each other once set angular positions in which the fluid jets of two closest nozzle elements, in particular two directly adjacent nozzle head parts can be blasted without contact past each other on the metallic surface.

Advantageously, the rotational movements of the individual nozzle head parts or their drive means are synchronized in the correct position for this purpose, so that the individual nozzle head parts always rotate in alignment with one another as required.

The method according to the invention thus avoids that, for example, with a corresponding rotor descaling, individual fluid jets mutually adversely affect each other before hitting the metallic surface and thereby mutually weaken or even extinguish them completely, as may hitherto be the case in the prior art. Such effects occur especially at bottlenecks between two directly adjacent nozzle head parts, when nozzle elements are guided past this constriction at the same time. To such a simultaneous passing of nozzle elements at the bottleneck of two directly juxtaposed nozzle head parts, it is often unintentional because it hitherto adjustment technology and / or control or control technology is not ensured that the individual nozzle head parts always pass through the bottleneck alternately. Rather, the juxtaposed rotary head parts somehow rotate to each other.

The term "always" describes each operating phase of the rotatable or rotating nozzle head parts at least during one

Descaling. In the present case, however, the individual nozzle head parts rotate synchronously and in the correct position relative to one another, so that it is avoided that nozzle elements of directly adjacent nozzle head parts are guided past the constriction at the same time. In this respect, the cleaning effect of metallic surfaces is significantly improved in the present case.

It does not matter if two immediately adjacent

Rotate nozzle head elements in the same direction or in opposite directions to each other, since the nozzle elements always with respect to their angular positions to each other

are aligned so that the fluid jets two closest nozzle elements of two immediately adjacent nozzle head parts are non-contact blasted past each other on the metallic surface. In the present case, the most varied media can be used as fluid jets, as long as it is suitable for descaling or otherwise cleaning the metallic surface. In the present case, high pressure water jets are preferably used as fluid jets. The fluid jets may be generated as a cone beam geometry, elliptical beam geometry, fan beam geometry, or the like.

The metallic surface is, for example, a hot-rolled surface which is to be freed of a scale layer. It is understood that by means of the present invention, other undesired substances adhering to it can also be removed from the metallic surface.

For the purposes of the invention, the metallic semifinished product is, for example, forged or rolled metallic strip material, such as slabs, thin slabs, hot strip, pre-strip or the like. The nozzle head parts of the nozzle device which are arranged next to one another in a row are in each case mounted rotatably about their own axis of rotation. This axis of rotation is preferably perpendicular with respect to the conveyed in the transport direction metallic semi-finished.

At least one nozzle element is arranged at each of the nozzle head parts, which has at least one outlet opening from which a

Liquid jet emerges under high pressure. In the simplest case, such an outlet opening can represent the nozzle element in the sense of the invention.

The term "bottleneck" describes within the meaning of the invention, an area with the smallest distance between two directly opposite one another

Nozzle head parts, in which nozzle elements of the two nozzle head parts lie opposite one another, ie come closest to one another when these two nozzle head parts rotate correspondingly about their respective rotation axis. This bottleneck is located on a connecting line connecting all rotational axes. The bottleneck thus describes an area at which two nozzle head parts are arranged so close to each other that overlap of at least two of the two temporally rotated therein jet elements fluid jets before impact on the metallic surface or at least can affect, whereby they hinder each other adversely.

Once preset angular positions can be reliably maintained when the nozzle head parts rotate at mutually synchronized speeds.

If the nozzle head parts are accelerated synchronized, an exact

Compliance once preset angular positions with respect to the nozzle head parts are further improved. This applies to both a positive and a negative acceleration. In order to ensure always desired or required angular positions with respect to the individual nozzle head parts to each other, it is advantageous if the respective angular positions of the nozzle head parts are calibrated to each other, for example, before treatment of the metallic surface with the present device or during operation.

In such a calibration, in particular the angular positions and the rotational speeds of the individual nozzle head parts are adjusted to each other such that the nozzle elements of the immediately adjacent nozzle head parts always pass through the constriction alternately, so that the generated by means of the nozzle elements

Fluid jets always touch each other without contact on the metallic

Surface to be blasted.

In this respect, an advantageous variant of the method also provides that the

Nozzle elements of two directly adjacent nozzle head parts always pass through the bottleneck in such a way that the fluid jets generated by means of the nozzle elements always contact each other without touching each other

metallic surface to be blasted. In this context, it is advantageous if the nozzle elements of two directly adjacent nozzle head parts are always guided with a time delay past the constriction. This can adversely affect two

Fluid jet in the context of the invention can be further improved prevented. It is understood that the time offset must be chosen to be large enough to achieve the desired effects.

The object of the invention is also achieved by a device for descaling a metallic surface of a metallic semifinished product with a nozzle device, on which the metallic semi-finished product can be guided in the transport direction, in which the nozzle device to a variety of order Rotary axes rotating nozzle head parts with nozzle elements for generating directed onto the metallic surface and high pressure fluid jets, wherein the nozzle head parts are arranged side by side, that the fluid jets generated by the nozzle elements at a bottleneck between two immediately adjacent nozzle head parts before hitting the metallic Can touch or overlap surface, characterized in that the individual rotating nozzle head parts are always aligned with respect to their angular positions aligned with each other so that the fluid jets generated by the nozzle elements are always radiated contactless past each other on the metallic surface.

The fact that the individual rotating nozzle head parts with respect to their

Angle layers are always arranged aligned with each other so that the fluid jets generated by the nozzle elements are always radiated contactless past each other on the metallic surface, the cleaning effect is significantly increased with respect to metallic surfaces.

This is ensured by the fact that the exact angular positions of the individual nozzle head parts are firmly impressed. Thus, the individual rotating nozzle head parts keep their once defined angular position to each other.

In particular, the present method can advantageously be carried out with the present device. An embodiment variant provides that the nozzle elements of two directly adjacent nozzle head parts are always aligned with respect to their angular positions in such a way that the fluid jets generated by means of the nozzle elements always contact each other without contact on the metallic

Surface are radiant. Preferably, the individual angular positions of the nozzle head parts are offset by an angle of rotation offset aligned to each other, that the nozzle elements of two immediately adjacent nozzle head parts always time-delayed run into the region of the bottleneck, so that at the bottleneck only one nozzle element and thus always only a fluid jet temporarily positioned is.

A particularly preferred embodiment provides that the device has a drive device for driving the nozzle head parts, by means of which the nozzle head parts are drivable synchronized in terms of their rotational properties.

The term "rotational properties" specifically refers to the angular acceleration and the angular velocity of the individual nozzle head parts.It is understood that the drive device can be of different construction For example, each of the nozzle head parts can be assigned a drive motor as its own drive means

Drive means only a drive motor, which is operatively connected via a corresponding gear unit with the nozzle head parts.

In any case, it is advantageous if the nozzle head parts are mechanically and / or electronically interacting with each other in such a way that the individual nozzle head parts of the nozzle device are always preset

Angular positions are arranged aligned with each other.

In principle, it is particularly easy in an electronic coupling, different basic positions with respect to the angular positions of the rotating nozzle head parts to each other at a start of a manufacturing process of the metallic semi-finished or a Entzunderungsprozesses of metallic surfaces to select depending on parameters, such as a distance of the nozzle elements the metallic surface of the metallic Semi-finished or a transport speed of the metallic semi-finished product relative to the nozzle elements to achieve the most favorable cleaning result. A negative effect on two fluid jets in the region of the constriction between two nozzle head parts can always be ruled out if the nozzle elements of two directly adjacent nozzle head parts are offset with respect to their angular positions by more than 5 ° or by more than 15 °, preferably by 45 °.

The object of the invention is further achieved by a plant for producing metallic semi-finished products, in particular metallic strip material, with a device for descaling the metallic surfaces of the metallic semi-finished product, wherein the system is characterized by a device for descaling according to one of the features described herein. By means of such a plant equipped corresponding metal semi-finished products can be produced with a particularly high surface quality.

Further features, effects and advantages of the present invention will be explained with reference to the appended drawing and the following description, in which an installation for producing metallic semi-finished products with a descaling device is shown and described by way of example, in which individual rotating nozzle head parts are always aligned with respect to their angular positions in such a way, that generated by nozzle elements

Fluid jets always touch each other without contact on the metallic

Surface are radiant.

In the drawing: FIG. 1 schematically shows a plant for producing a metallic one

Semi-finished product; and FIG. 2 schematically shows a plan view of a nozzle head part arrangement of a nozzle device of the descaling device of the system from FIG. 1. The present inventive device 1 for descaling metallic surfaces 2 and 3 of a metallic semi-finished product 4 is integrated according to the embodiment shown in the figure 1 in a plant 5 for producing the metallic semifinished product 4. The plant 5 in this case comprises a casting machine 6 with a mold 7 and a casting 8, wherein the emerging from the casting sheet 8 metallic semi-finished 4 in the form of a metallic strip 9 then by different roughing scaffolding 10 and scaffolds 1 1 a

Production line 12 is conveyed in the transport direction 13. Further, a

Induction furnace 14 is provided, by means of which the metallic strip 9 after a rolling operation in the roughing stands 10 to a higher temperature

is raised. The descaling of the surfaces 2 and 3 takes place behind the induction furnace 14 by the descaling apparatus 1, the

Device 1 comprises a scale scrubber 15.

The device 1 is distinguished, in particular, by a nozzle device 16, which in each case has an arrangement of seven nozzle head parts 18 arranged side by side both above the metallic strip 9 and below the metallic strip 9 (see also FIG. The row 17 in this case runs in the width direction 19 of the metallic strip 9 transversely to the transport direction 13.

Each of the existing nozzle head parts 18 is mounted in the nozzle device 16 such that it rotates about its own axis of rotation 20 (only exemplified). Furthermore, each of the nozzle head parts 18 has four nozzle elements 22, 23, 24 and 25 arranged at 90 ° to one another on the outer edge 21 of the nozzle head parts 18. The nozzle elements 22 to 25 have at least one outlet opening (not shown), from which a high-pressure fluid jet (not shown here) can emerge, wherein the nozzle elements 22 to 25 are arranged such that the fluid jets generated by them on the respective surface. 2 or 3 are blasted. All nozzle elements 22 to 25 rotate here

in the same direction according to the direction of rotation 26 about their respective axis of rotation 20 perpendicular to the plane of the drawing. The rotation axes 20 are in this case on a common fictitious connecting line 27 In order to prevent that individual fluid jets intersect or touch so that their beam effects mutually reduce or cancel, the nozzle head parts 18 are arranged side by side, that of the

Nozzle elements 22, 23, 24 and 25 generated fluid jets at each bottleneck 30 between two immediately adjacent nozzle head parts 18 are always contactless past each other on the metallic surface 2, 3 are radiant.

For this purpose, the individual rotating nozzle head parts 18 with respect to their respective angular position 31 and 32 (here only exemplarily numbered) are arranged aligned with each other such that the nozzle elements 22, 23, 24, 25 of two directly adjacent nozzle head parts 18 always alternately pass through the respective constriction 30.

This means that the first of the nozzle head parts 18 has a first angular position 31 with an angle of rotation 33 (only exemplified) of 45 ° with respect to the imaginary connecting line 20 and further of the nozzle head part 18, which are directly adjacent, another angular position 32 with a further angle of rotation (not drawn) from 0 ° with respect to the imaginary connecting line 20, as shown by way of example with regard to the snapshot shown in FIG. For example, the nozzle elements 23 and 25 of some of the nozzle head parts 18 coincide with the imaginary connecting line 20 (angle of rotation = 0 °), ie they are at the respective constriction 30 of two directly adjacent ones

Nozzle head parts 18 temporarily positioned, while the nozzle elements 24 and 25 or 22 and 23 of this directly adjacent nozzle head parts 18 of the

Bottleneck 30 or twisted by the fictitious connecting line 20 by 45 °

are arranged.

As a result, it can be ensured in a structurally particularly simple manner that the nozzle elements 22, 23, 24, 25 of two directly adjacent nozzle head parts 18 are always guided past the constriction 30 at a corresponding time offset.

Advantageously, the rotational movements of the individual nozzle head parts (18) or their drive means (not shown here) are preferably always synchronized in the correct position, so that the individual nozzle head parts (18) always rotate in alignment with one another as required.

It is understood that the exemplary embodiment explained above is only a first embodiment of the descaling device according to the invention. In this respect, the embodiment of the invention is not limited to this embodiment.

LIST OF REFERENCE NUMBERS

1 device for descaling

2 first metallic surface

3 second metallic surface

4 metallic semi-finished products

5 plant for manufacturing

6 casting machine

7 mold

8 pouring arc

9 metallic band

10 roughing scaffolding

1 1 scaffolding

12 production line

13 transport direction

14 induction furnace

15 tinder scrubber

16 nozzle device

17 series

18 nozzle head parts

19 width direction

20 rotation axis

21 outer edge

22 first nozzle element

23 second nozzle element

24 third nozzle element

25 fourth nozzle element

26 direction of rotation

27 fictional connection line Narrowing first angular positions second angular positions first rotational angle

Claims

claims:

1 . Method for descaling a metallic surface (2, 3) of a

Metallic semifinished product (4, 9), in which the metallic semi-finished product (4, 9) in the transport direction (13) on transversely to this transport direction (13) juxtaposed and rotating nozzle head parts (18) is guided past and in which by means of these rotating

Düsenkopfteilen (18) arranged nozzle elements (22, 23, 24, 25) on the metallic surface (2, 3) directed and high pressure fluid jets are generated, which at a constriction (30) between two immediately adjacent nozzle head parts (18) before can touch or overlap the impact on the metallic surface (2, 3), characterized in that the nozzle head parts (18) rotate synchronously with one another in such a preset angular position (31, 32) that the nozzle elements (22, 23, 24 , 25) generated fluid jets are always non-contact past each other on the metallic surface (2, 3) are blasted.

2. The method according to claim 1, characterized in that the

Rotate nozzle head parts (18) at mutually synchronized speeds.

3. The method according to claim 1 or 2, characterized in that the

Nozzle head parts (18) can be accelerated synchronized.

4. The method according to any one of claims 1 to 3, characterized in that the respective angular positions (31, 32) of the nozzle head parts (18)

be calibrated to each other.

5. The method according to any one of claims 1 to 4, characterized in that the nozzle elements (22, 23, 24, 25) of two immediately adjacent nozzle head parts (18) always pass the constriction (30) alternately such that by means of the nozzle elements (22 , 23, 24, 25) Fluid jets are always non-contact past each other on the metallic surface (2, 3) are blasted.

6. The method according to any one of claims 1 to 5, characterized in that the nozzle elements (22, 23, 24, 25) of two immediately adjacent nozzle head parts (18) always time-delayed at the constriction (30) are passed over.

7. Device (1) for descaling a metallic surface (2, 3) of a metallic semifinished product (4, 9) with a nozzle device (16), on which the metallic semifinished product (4, 9) in the transport direction (13) is guided past, at the nozzle device (16) having a multiplicity of nozzle head parts (18) rotating around rotational axes (20) with nozzle elements (22, 23, 24, 25) for producing high-pressure fluid jets directed onto the metallic surface (2, 3), the

Nozzle head parts (18) are arranged side by side so that the fluid jets generated by the nozzle elements (22, 23, 24, 25) at a constriction (30) between two immediately adjacent nozzle head parts (18) before striking the metallic surface (2, 3) can touch or overlap, characterized in that the individual rotating nozzle head parts (18) with respect to their angular positions (31, 32) are always arranged aligned with each other so that the means of the nozzle elements (22, 23, 24, 25) generated fluid jets always

contactlessly past each other on the metallic surface (2, 3) are radiant.

8. Device (1) according to claim 7, characterized in that the

Nozzle elements (22, 23, 24, 25) of two immediately adjacent

Nozzle head parts (18) with respect to their angular positions (31, 32) are always arranged aligned with each other so that the means of

Nozzle elements (22, 23, 24, 25) always generate fluid jets

contactlessly past each other on the metallic surface (2, 3) are radiant.

9. Device (1) according to claim 7 or 8, characterized by a drive device for driving the nozzle head parts (18), by means of which the nozzle head parts (18) are synchronized driven in terms of their rotational properties.

10. Device (1) according to one of claims 7 to 9, characterized

in that the nozzle head parts (18) are mechanically and / or electronically interacting with each other in such a way that the individual nozzle head parts (18) of the nozzle device (16) are always aligned with preset angular positions (31, 32).

1 1 .Vorrichtung (1) according to one of claims 7 to 10, characterized

characterized in that the nozzle elements (22, 23, 24, 25) of two directly adjacent nozzle head parts (18) with respect to their angular positions (31, 32) by more than 5 ° or more than 15 °, preferably arranged at 45 ° to each other ,

12. system (5) for producing metallic semi-finished products (4, 9),

in particular of metallic strip material (9), with a device (1) for descaling the metallic surfaces (2, 3) of the metallic semi - finished products (4, 9), characterized by a device (1) for

Descaling according to one of claims 7 to 11.