EP4045204B1 - Cooling device with coolant jets with hollow cross-section - Google Patents

Description

field of technology

• wobei die Behandlungslinie eine Fertigstraße zum Walzen des Walzguts aufweist,
• wobei die Behandlungslinie eine Kühleinrichtung aufweist,
• wobei die Kühleinrichtung der Fertigstraße vorgeordnet ist, der Fertigstraße nachgeordnet ist oder innerhalb der Fertigstraße angeordnet ist
• wobei die Kühleinrichtung einen ersten Kühlbalken aufweist, der sich in Breitenrichtung des Walzguts gesehen vollständig über das Walzgut erstreckt,
• wobei der erste Kühlbalken zum Walzgut hin mehrere erste Kühlmittelauslässe aufweist, mittels derer Wasser auf das Walzgut aufgebracht wird,
• wobei die ersten Kühlmittelauslässe im ersten Kühlbalken ortsfest in mindestens einer sich in Breitenrichtung des Walzguts erstreckenden Reihe angeordnet sind und in Breitenrichtung des Walzguts gesehen innerhalb der jeweiligen Reihe jeweils einen vorbestimmten Abstand voneinander aufweisen,
• wobei die ersten Kühlmittelauslässe als Vollstrahldüsen ausgebildet sind, aus denen im Betrieb ein Vollstrahl mit einem jeweiligen in sich zusammenhängenden Querschnitt austritt,
• wobei ein Strahlungsöffnungswinkel des aus den Vollstrahldüsen austretenden Vollstrahls maximal 5° beträgt,
• wobei die Querschnitte der Vollstrahlen jeweils eine konvexe Hülle aufweisen.

The present invention is based on a treatment line for a flat, elongated hot rolled metal material,

• wherein the treatment line has a finishing train for rolling the rolled stock,
• wherein the treatment line has a cooling device,
• wherein the cooling device is arranged upstream of the finishing train, is arranged downstream of the finishing train or is arranged within the finishing train
• wherein the cooling device has a first cooling beam which, viewed in the width direction of the rolling stock, extends completely over the rolling stock,
• wherein the first cooling beam has a plurality of first coolant outlets towards the rolling stock, by means of which water is applied to the rolling stock,
• wherein the first coolant outlets in the first cooling beam are arranged in a stationary manner in at least one row extending in the width direction of the rolling stock and, viewed in the width direction of the rolling stock, are each at a predetermined distance from one another within the respective row,
• wherein the first coolant outlets are designed as full jet nozzles, from which a full jet with a respective coherent cross section emerges during operation,
• wherein a radiation opening angle of the full jet emerging from the full jet nozzles is a maximum of 5°,
• where the cross sections of the solid beams each have a convex hull.

The term “metal” in the sense of the present invention is intended to include, on the one hand, elementary metals such as aluminum or copper. On the other hand, the term “metal” should also include common metal alloys. For example, the rolling stock can consist in particular of steel, aluminum or an aluminum alloy or, in individual cases, also of brass. The flat, elongated rolling stock can alternatively be designed as a strip or as a plate.

In the finishing train, the rolling stock is rolled from an initial thickness to a final thickness. The finishing train usually has several rolling stands that are arranged one behind the other so that the rolling stock passes through them with a uniform transport direction. In individual cases, however, reversing rolling can also take place. In the subsequent cooling section, the rolling stock is cooled to a target temperature. An attempt is often made to precisely set a given temperature curve over time. Furthermore, a cooling device can be arranged upstream of the finishing train in order to be able to adjust the temperature of a strip that has not yet been rolled entering the finishing train. So-called intermediate stand cooling systems can also be arranged between the rolling stands of the finishing train.

State of the art

Such treatment lines are well known. In particular, hot rolling mills - be it in the form of insulated rolling trains or in the form of casting rolling mills - are usually followed by a cooling section. Depending on the situation in the individual case, the cooling section can be designed as a laminar cooling section and/or as cooling with a so-called water curtain and/or as splash water cooling and/or as intensive cooling. The same applies to cooling devices in front of the finishing line or within the finishing line. In all cases, water is applied to the rolling stock to be cooled across the width of the rolling stock to be cooled.

With the exception of the design as a so-called water curtain - here there is a single "nozzle" which extends over the entire width of the rolling stock - the first cooling beam has a number of coolant outlets which are arranged at a predetermined distance from one another when viewed in the width direction of the rolling stock , usually in a fixed grid of, for example, 5 cm. The water is applied to the flat rolling stock from above or below using the first cooling beam. At least in the case of a cooling section downstream of the finishing train, several cooling beams are arranged both above and below the rolling stock, viewed in the transport direction of the flat rolling stock.

The coolant outlets can be designed in various ways.

For example, a design is known as spray nozzles, often also referred to as fan nozzles. Fan nozzles apply the water to the flat rolling stock in a jet that has a significant opening angle, often 50° or more, at least in one direction when viewed from the respective spray nozzle. When using fan nozzles, the cooling effect is often significantly uneven across the width of the flat rolling stock.

A design known as spray nozzles is also known.

Spray nozzles atomize the water. They therefore have a relatively low cooling effect. In addition, this cooling effect is also uneven across the width of the flat rolling stock.

The coolant outlets are usually designed as full jet nozzles. This applies both when the cooling device is designed as a laminar cooling device and when the cooling device is designed as intensive cooling. With full jet nozzles, the water comes out of the respective jet in the form of a compact jet (called a full jet or impingement jet). Full jet nozzle off. The full beam has only a small or no opening angle. Solid jet nozzles are nozzles from which the water emerges in a jet that does not expand or at least only expands slightly. A jet opening angle that the water jet emerging from the respective full jet nozzle has is usually a maximum of 5°, often only 3° or only 2° or even an even lower value.

Even with solid jet nozzles, the cooling of the flat rolling stock is higher in the area where the jets impinge on the flat rolling stock than in the areas in between. Even when using solid jet nozzles, this results in uneven belt cooling. In the overall evaluation, however, full jet nozzles have the most advantages and the fewest disadvantages compared to the other types of nozzles. As a rule, full jet nozzles are therefore used in cooling systems.

The material properties of the flat rolling stock are influenced to a considerable extent by the time course of the cooling in the cooling device, in particular in a cooling section downstream of the finishing train. If the cooling is uneven across the width of the rolling stock, this also results in uneven material properties. In some cases these fluctuations can be tolerated. In other cases they are annoying. Furthermore, the uneven cooling can also cause flatness errors.

Within cooling sections (i.e. cooling devices that are arranged downstream of the finishing train), attempts are usually made to minimize the problems by staggering the coolant outlets of cooling beams successive in the transport direction of the rolling stock or, within a respective cooling beam, the coolant outlets of the different rows of coolant outlets relative to one another. In particular, with only one row of coolant outlets per cooling beam, for example the coolant outlets of a specific cooling beam seen in the width direction of the flat rolling stock, be arranged centrally between the coolant outlets of the cooling beam, which is arranged immediately upstream of the relevant cooling beam as seen in the transport direction of the flat rolling stock. This means that the problems of the prior art can be reduced, but not eliminated.

From the KR 101 394 447 B1 a treatment line for a flat, elongated hot rolled metal stock is known, which has a roughing train and a finishing train for rolling the rolled stock. A cooling section is arranged between the roughing train and the finishing train. The cooling section has a single cooling beam which, viewed in the width direction of the rolling stock, extends completely over the rolling stock. The cooling beam can have several application devices towards the rolling stock, which in turn each have several coolant outlets. The application devices can be positioned independently of one another in the width direction of the rolling stock. Furthermore, before cooling the hot rolling stock, it is possible to select for each application device by means of which of the respective coolant outlets water is to be applied to the rolling stock. The coolant outlets have different nozzle shapes. One of the nozzle shapes has a strip running around the edges in the manner of a rectangle.

Summary of the invention

The object of the present invention is to create options by means of which improved cooling of the flat rolling stock can be achieved after rolling in the finishing train.

The task is solved by a treatment line with the features of claim 1. Advantageous configurations of the treatment line are the subject of dependent claims 2 to 12.

According to the invention, a treatment line of the type mentioned at the outset is designed in that the respective convex shell contains at least one area that is not contained in the respective full beam itself.

This means that, on the one hand, the way in which the water is applied to the flat rolling stock - namely as a full jet - can be maintained, but the water can be applied over a larger area, particularly in the width direction of the rolling stock. This allows the cooling to be evened out.

It is possible for the first cooling beam to be designed as an intensive cooling beam. In this case, the water emerges from the first coolant outlets of the first cooling beam at a pressure of at least 1 bar, in particular at a pressure that is between 1.5 bar and 4 bar. Alternatively, it is possible for the first cooling beam to be designed as a laminar cooling beam. In this case, the water emerges from the first coolant outlets of the first cooling beam at a maximum pressure of 0.5 bar, in particular at a pressure between 0.1 bar and 0.4 bar.

It is possible for the cross sections of the solid beams to be closed in a ring. In this case, cross sections of the solid beams therefore each surround an area which, viewed in the cross-sectional plane, is completely enclosed by the cross section of the respective full beam. Although this area is part of the convex shell of the respective full beam, it is not part of the cross section of the respective full beam itself. Alternatively, it is possible for the cross sections of the full beams to each be designed as part of a respective circular ring. The respective circular ring can in particular extend over a respective angle of at least 90° and a maximum of 270°, usually about 150° to 210°.

Alternatively, it is possible for the cross sections of the solid beams to be V-shaped or zigzag-shaped. Zigzag shapes are, for example, an N-shape or a W-shape. The fewer kink points the cross section has, the more preferred the respective shape is.

The respective convex shell has a maximum extent when viewed in the cross-sectional plane. The respective cross section has a maximum effective width when viewed in the cross-sectional plane. Preferably, the ratio of the maximum extension to the maximum effective width is greater than 3:1, in particular greater than 5:1.

In many cases, the cooling device includes - in addition to the first cooling beam - at least a second cooling beam. This is usually the case, particularly in the case of a cooling device downstream of the finishing train (i.e. a cooling section). In this case, the second cooling beams - just like the first cooling beam - extend completely over the rolling stock when viewed in the width direction of the rolling stock. They also have - just like the first cooling beam - several coolant outlets towards the rolling stock, through which water is applied to the rolling stock. The second coolant outlets are arranged in a stationary manner in the second cooling beam in at least one row extending in the width direction of the rolling stock. Within the respective row, the second coolant outlets are each at a predetermined distance from one another. However, the second cooling beams are arranged behind the first cooling beam when viewed in the transport direction of the rolling stock. The rolling stock is therefore first cooled by means of the first cooling beam, then by means of the second cooling beam.

Preferably, the second coolant outlets of at least one of the second cooling beams are arranged between the coolant outlets of the first cooling beam, viewed in the width direction of the rolling stock. This means that any remaining unevenness in the cooling using the first cooling bar can be eliminated be balanced. This second cooling beam can in particular be the cooling beam that is immediately downstream of the first cooling beam as seen in the transport direction of the rolling stock.

It is possible for the second coolant outlets of at least one of the second cooling beams to be designed as full jet nozzles, from which a full jet with a respective cross section emerges during operation. In this case, the cross sections of these full beams can each have a convex hull and, furthermore, this respective convex hull can contain at least one area that is not contained in the respective full beam itself. As a result, the same advantages can be achieved with regard to the corresponding second cooling beam as with regard to the first cooling beam.

Alternatively, it is possible for the second coolant outlets of at least one of the second cooling beams to be designed as full jet nozzles from which a full jet with a respective cross section emerges during operation, the cross sections of these full jets each having a convex shell, but with this respective convex shell corresponds to the cross section of the respective full beam. In this case, the full jet nozzles of the corresponding second cooling beam are designed in a conventional manner.

It is also possible for the second coolant outlets of at least one of the second cooling beams to be designed as fan nozzles or spray nozzles.

The object according to the invention is also achieved by a method for finish rolling and cooling a flat, elongated metal rolling stock in a treatment line according to claim 13, wherein the rolling stock is hot-rolled in the finishing train of the treatment line, and the at least partially hot-rolled rolling stock is cooled in a cooling device of the treatment line is, whereby the rolling stock is cooled in its width direction by several solid jets of water is, with several, preferably all, full beams each containing a convex shell with at least one area that is not contained in the respective full beam itself.

According to one embodiment, the rolling stock is wound into a coil after cooling.

Brief description of the drawings

FIG 1

eine Behandlungslinie für ein flaches, langgestrecktes, heißes Walzgut von der Seite,

FIG 2

die Behandlungslinie von FIG 1 von oben,

FIG 3

die dem Walzgut zugewandte Seite eines ersten Kühlbalkens,

FIG 4

einen Kühlmittelauslass und einen Vollstrahl,

FIG 5

den Vollstrahl von FIG 4 im Querschnitt,

FIG 6 bis 13

zu FIG 5 alternative Querschnitte,

FIG 14

die dem Walzgut zugewandte Seite eines zweiten Kühlbalkens,

FIG 15

einen Vollstrahl im Querschnitt,

FIG 16

einen Kühlmittelauslass und einen Fächerstrahl,

FIG 17 und 18

mögliche Querschnitte eines Fächerstrahls,

FIG 19

einen Kühlmittelauslass und ein Sprühbild und

FIG 20

ein Sprühbild.

The characteristics, features and advantages of this invention described above, as well as the manner in which these are achieved, will be more clearly and clearly understood in connection with the following description of the exemplary embodiments, which will be explained in more detail in connection with the drawings. This shows in a schematic representation:

FIG 1

a treatment line for a flat, elongated, hot rolled material from the side,

FIG 2

the treatment line of FIG 1 from above,

FIG 3

the side of a first cooling beam facing the rolling stock,

FIG 4

a coolant outlet and a full jet,

FIG 5

the full beam of FIG 4 in cross section,

FIGS. 6 to 13

to FIG 5 alternative cross sections,

FIG 14

the side of a second cooling beam facing the rolling stock,

FIG 15

a full beam in cross section,

FIG 16

a coolant outlet and a fan jet,

FIGS. 17 and 18

possible cross sections of a fan beam,

FIG 19

a coolant outlet and a spray pattern and

FIG 20

a spray painting.

Description of the embodiments

According to the FIGS. 1 and 2 a treatment line has a finishing train 1. As a rule, the finishing train 1 has several roll stands 2, often between three and seven roll stands 2, in particular four or six roll stands 2, for example five roll stands 2. Shown are in the FIGS. 1 and 2 only the first and last rolling stands 2 of the finishing train 1. The rolling stands 2 are usually arranged one behind the other, so that a flat, elongated, hot rolling stock 3 made of metal passes through them in a uniform transport direction x. In individual cases, however, reversing rolling can also take place. The rolling stock 2 can consist of steel or aluminum, for example. Alternatively, it can be a strip or a heavy plate.

In the finishing train 1, the rolling stock 3 is rolled from an initial thickness to a final thickness. The rolling stock 3 therefore enters the first rolling stand 2 of the finishing train 1 with the initial thickness and leaves the last rolling stand 2 of the finishing train 1 with the final thickness. The rolling stock 3 has a final rolling temperature when it leaves the last rolling stand 2 of the finishing train 1. The final rolling temperature can, for example, be between 750 ° C and 1,000 ° C for a rolling stock 3 made of steel.

Most of the components of the treatment line upstream of the finishing train 1 are of minor importance in the context of the present invention. For example, the finishing train 1 can be preceded by a continuous casting plant. If necessary, a roughing train or a roughing stand can be arranged between the finishing train 1 and the continuous casting plant. It is also possible for the finishing train 1 to be preceded by an oven in which a pre-strip is heated to rolling temperature. Other configurations are also possible.

The treatment line also has a cooling device 4. In the present case, the cooling device 4 is designed as a cooling section which is arranged downstream of the finishing train 1. In the cooling section, the rolling stock 3 is cooled to a target temperature, starting from the final rolling temperature. For example, for a rolling stock 3 made of steel, the target temperature can be in the range between 150 ° C and 800 ° C. Often attempts are made to to precisely set a specified temperature curve over time. As an alternative to an arrangement behind the finishing train 1, the cooling device 4 could also be arranged within the finishing train 1, that is to say it could be designed as an intermediate stand cooling system which is arranged between two roll stands 2 of the finishing train. As an alternative to an arrangement behind the finishing train 1 or within the finishing train 1, the cooling device 4 could also be arranged upstream of the finishing train 1, for example designed as a pre-strip cooling between a roughing train or a roughing stand and the finishing train 1.

In the case of a strip, for example, a reel can be arranged downstream of the cooling section. In the case of heavy plate, a shelf can be arranged downstream of the cooling section. The devices downstream of the cooling section are of minor importance and are not the subject of the present invention.

The cooling section has rollers 5, by means of which the rolling stock 3 is conveyed through the cooling section in the transport direction x. The reels 5 are only in FIG 1 shown. In FIG 1 Again, only some of the rollers 5 are provided with their reference numbers. However, the roles 5 as such are of minor importance in the context of the present invention and will therefore not be discussed further.

To cool the rolling stock 3, the cooling device 4 has a first cooling beam 6. The first cooling beam 6 extends accordingly FIG 2 viewed in the width direction y of the rolling stock 3, completely over the rolling stock 3. This applies regardless of the specific width of the rolling stock 3. The first cooling beam 6 is therefore dimensioned such that it completely covers the rolling stock 3, viewed in the width direction y, even if the rolling stock 3, based on the treatment line that has the maximum possible width. At least in the case of a cooling section, not only is the first cooling beam 6 present, but the cooling device 4 also has a number of second cooling beams 7. The second cooling beams 7 also extend Viewed in the width direction y of the rolling stock 3, it extends completely over the rolling stock 3.

According to the representation in the FIGS. 1 and 2 The present invention is explained with a first cooling beam 6 and also a second cooling beam 7, all of which are arranged above the rolling stock 3 (or above the rollers 5). Alternatively, the cooling beams 6, 7 could all be arranged below the rolling stock 3 (or below the rollers 5). The corresponding statements regarding the arrangement and design of the cooling beams to the cooling beams 6, 7 remain unchanged in this case. It is also possible for 3 cooling beams 6, 7 to be arranged both above and below the rolling stock. In this case, the corresponding statements regarding the arrangement and design of the cooling beams 6, 7 apply independently of one another to the cooling beams 6, 7 arranged above the rolling stock 3 on the one hand and the cooling beams 6, 7 arranged below the rolling stock 3 on the other hand.

The first cooling beam 5 points as shown in FIG 3 several coolant outlets 8 towards the rolling stock 3. Water 9 is supplied via the coolant outlets 8 (see the FIG 1 and 4 ) applied to the rolling stock 3. The coolant outlets 8 are as shown in FIG 3 arranged in a stationary manner in the first cooling beam 6. The coolant outlets 8 can be arranged in one row or in multiple rows as required. Within the respective row, the coolant outlets 8 each have a predetermined distance a1 from one another when viewed in the width direction y of the rolling stock 3. The distance can be in the range of a few cm, for example 4 cm to 8 cm. The coolant outlets 8 also extend overall over the entire width of the rolling stock 3. The side edges of a rolling stock 3 with the maximum possible width are in FIG 3 shown in dashed lines. The center line of the roller table defined by the rollers 5 is also shown in dash-dotted lines.

The coolant outlets 8 of the first cooling beam 6 are generally uniform. The following is in connection with FIGS. 4 and 5 therefore only one of the coolant outlets 8 will be explained in more detail. The corresponding statements also apply to the other coolant outlets 8 of the first cooling beam 6.

According to the representation in FIG 4 the coolant outlet 8 is designed as a full jet nozzle. A full jet 10 emerges from the full jet nozzle during operation. A full jet 10 and the corresponding full jet nozzle are characterized in that the full jet 10 does not expand or at least only expands slightly. A beam opening angle α1, which the full beam 10 has, is usually a maximum of 5°, often only 3° or only 2° or even an even lower value. Ideally, the beam opening angle α1 is 0° or as close as possible to 0°.

FIG 5 shows the cross section 11 of the full jet 10 after emerging from the coolant outlet 8. A distance b of the cross-sectional plane 12 in which the cross-section 11 is recorded can be as shown in FIG 4 For example, between 20% and 80% of the distance that the coolant outlet 8 has from the rolling stock 3 as seen in the jet direction r. The beam direction r in the present case is as shown in FIG 1 and 4 orthogonal to the transport direction x and also orthogonal to the width direction y. However, this is not absolutely necessary. According to FIG 5 the cross section 11 of the full beam 10 is coherent, but not convex. The associated convex hull therefore contains (at least) one region 13, which is contained in the convex hull, but not in the respective full beam 10 itself.

The convex shell has a maximum extension D - seen in the cross-sectional plane 12. In the case of the design according to FIG 5 this is the diameter of the convex hull. The cross section 11 in turn points in the cross section plane 12 a maximum effective width d. The maximum effective width d of the cross section 11 can generally be defined as follows:
You choose an arbitrary starting point P1 on the edge of the cross section 11 and, starting from the point P1, draw a straight line L that enters the cross section 11. The end point P2 is determined at which the line L emerges from the cross section 11 again. Next, the two angles β1 and β2 are determined at which the line L enters the cross section at the starting point P1 and at the end point P2 or exits the cross section 11. Each of the two angles β1 and β2 can be a maximum of 90°. Next, rotate the line L around the starting point P1 until you find the end point P2 at which the sum of the two angles β1 and β2 is maximum. The length of the now determined line L is the effective width for the starting point P1. This effective width is, so to speak, a “candidate” for the maximum effective width d. You now vary the starting point P1 and determine the length of the respective effective width for each starting point P1. The respective “candidate” for the maximum effective width d is determined. The maximum of the effective widths determined is the desired maximum effective width d.

The maximum effective width d is always smaller than the maximum extent D. Preferably the ratio of the maximum extent D to the effective width d is greater than 3:1, in particular greater than 5:1.

According to the illustration in FIG 5 the cross section 11 is closed in a ring shape. As a result, the cross section 11 surrounds a single, coherent area 13, which is completely enclosed by the cross section 11 when viewed in the cross section plane 12. In this case, the effective width at any point P1 can be defined as follows:
You place the starting point P1 on the outer edge of the cross section 11, i.e. on the edge of the cross section 11 facing away from the area 13. Starting from the starting point P1, you look for the end point P2, at which the connecting line L with the starting point P1 at the end point P2 in the Area 13 enters. Now vary the end point P2 until the length of the connecting line L between the starting point P1 and the end point P2 is minimal. The length of the line L determined in this way is the effective width for the starting point P1. By varying the starting point P1, the maximum effective width d can be determined as before.

Specifically, the cross section 11 forms a circular ring. However, other annular (closed) cross sections are also possible, for example according to the illustrations in the FIGS. 6 to 9 Cross sections based on a square (alternatively, for example a rectangle) or on ellipses or ovals.

According to the representation in FIG 10 It is also possible for the cross section 11 to be designed as part of a circular ring. In this case, the circular ring can extend with respect to the center 14 of the circular ring, for example, over an extension angle γ, which is generally at least 90° and a maximum of 270°. The extension angle α2 is usually between 120° and 240°, for example around 180°.

According to the representation in FIG 11 It is also possible for the cross section 11 to be V-shaped. According to the representation in the FIG 12 and 13 It is also possible for the cross section 11 to be designed in a zigzag shape. FIG 12 shows this for an N-form, FIG 13 for a W shape.

The second cooling beams 7 point according to FIG 14 - analogous to the first cooling beam 6 - there are also several coolant outlets 15 towards the rolling stock 3. Using the coolant outlets 15 of the second cooling beam 7, water 9 is also applied to the rolling stock 3. However, the second cooling beams 7 are arranged behind the first cooling beam 6 when viewed in the transport direction x of the rolling stock 3. Specifically, it is in FIG 14 the second cooling beam 7 is shown, which is immediately downstream of the first cooling beam 6 as seen in the transport direction x of the rolling stock 3.

In the case of the second cooling beams 7, too, the coolant outlets 15 are arranged in a stationary manner in the respective cooling beams 7. The coolant outlets 15 are - analogous to the coolant outlets 8 of the first cooling beam 6 - arranged in a row or in several rows. Within each row they point as shown in FIG 14 viewed in the width direction y of the rolling stock 3, each has a predetermined distance a2 from one another. The distance a2 can in particular correspond to the distance a1, with which the coolant outlets 8 of the first cooling beam 6 are spaced apart from one another when viewed in the width direction y of the rolling stock 3.

The arrangement of the coolant outlets 15 of the second cooling beams 7 can be as required. Especially with the one in FIG 14 In the second cooling beam 7 shown - that is, the cooling beam 7 which is immediately downstream of the first cooling beam 6 as seen in the transport direction x of the rolling stock 3 - the coolant outlets 15 of the corresponding cooling beam 7 are, however, preferably seen in the width direction y of the rolling stock 3 between the coolant outlets 8 of the first cooling beam 6 arranged. This is in FIG 14 It can be seen that, on the one hand, the distance a2 corresponds to the distance a1 and, on the other hand, the center line of the roller table, which is in FIG 14 is again shown in dash-dotted lines, is equidistant from the two immediately adjacent coolant outlets 15, while in the first cooling beam 6 as shown in FIG 3 one of the coolant outlets 8 there is on the center line of the roller table.

The coolant outlets 15 of the second cooling beams 7 can be designed as required. It is possible here that the coolant outlets 15 of the second cooling beams 7 are all designed in the same way. However, it is also possible that the coolant outlets 15 of one of the second cooling beams 7 are designed differently than the coolant outlets 15 of another of the second cooling beams 7. The following statements therefore each refer to an individual second cooling beam 7. On the one hand, this does not rule out that the coolant outlets 15 of the other second cooling beams 7 are also designed in the same way. On the other hand, it does not necessarily imply that the coolant outlets 15 of the other second cooling beams 7 are designed in the same way.

The coolant outlets 15 of one of the second cooling beams 7 can be designed in the same way as the coolant outlets 8 of the first cooling beam 6. Reference is made to the above statements FIGS. 4 to 13 referred. If the coolant outlets 15 of at least one of the second cooling beams 7 are designed in this way, these second cooling beams 7 generally include at least that second cooling beam 7 which is immediately downstream of the first cooling beam 6 as seen in the transport direction x of the rolling stock 3.

It is also possible that the coolant outlets 15 of one of the second cooling beams 7 - in accordance with the coolant outlets 8 of the first cooling beam 6 - are designed as full jet nozzles, from which a full jet with a respective cross section emerges during operation (compare FIG 4 ). But it is as shown in FIG 15 possible that, in contrast to the full beams of the coolant outlets 8 of the first cooling beam 6, the cross section 16 of the full beams of the coolant outlets 15 of the corresponding second cooling beam 7 has a convex shell which corresponds to the cross section 16 of the corresponding full beam.

It is also possible for the coolant outlets 15 of one of the second cooling beams 7 to be designed as fan nozzles. In In this case, the jets 17 emitted by means of these coolant outlets 15 point as shown in FIG 16 has a significant beam opening angle α2 in at least one direction. The beam opening angle α2 is often above 40°. Depending on the design of the corresponding coolant outlet 15, the spray pattern of the corresponding coolant outlet 15 can either be as shown in FIG 17 an elongated ellipse or as shown in FIG 18 be a circle. The orientation and rotation of the ellipses relative to the transport direction x and the width direction y can be designed as required. The situation in which an ellipse as shown in FIG 17 However, it is generally preferable to place it at an angle. However, as with the full jet nozzles, the jet direction r does not have to be oriented orthogonally to the plane defined by the transport direction x and the width direction y.

It is also possible for the coolant outlets 15 of one of the second cooling beams 7 to be as shown in FIG 19 are designed as spray nozzles. In this case, as shown in FIG 20 a circular spray pattern, but according to the illustration in FIG 19 the water 9 is no longer sprayed directly onto the rolling stock 3, i.e. no longer hits the rolling stock 3 at a significant speed directed towards the rolling stock 3.

If one of the second cooling beams 7 has fan nozzles or spray nozzles as coolant outlets 15, this second cooling beam 7 is not necessarily, but is preferably a second cooling beam 7, which is not immediately downstream of the first cooling beam 6.

It is possible for the first cooling beam 6 to be designed as an intensive cooling beam. The same design is also possible for the second cooling beams 7, provided they have full jet nozzles. In this case the water 9 comes out Coolant outlets 8, 15 of the corresponding cooling beams 6, 7 with a pressure p1 that is at least 1 bar. The pressure p1 is usually between 1.5 bar and 4 bar.

Alternatively, it is possible for the first cooling beam 6 to be designed as a laminar cooling beam. The same design is also possible for the second cooling beams 7, provided they have full jet nozzles. In this case, the water 9 emerges from the coolant outlets 8, 15 of the corresponding cooling beams 6, 7 with a pressure p2 which is a maximum of 0.5 bar. The pressure p2 is usually between 0.1 bar and 0.4 bar. The water 9 can be supplied to the second cooling beam 7, which has fan nozzles or spray nozzles, at a higher pressure. However, due to the design of the coolant outlets 15 as fan nozzles or spray nozzles, laminar cooling always occurs in these second cooling beams 7.

The present invention has many advantages. In particular, due to the non-convex, often "hollow" design of the cross section of the solid beams 10 of the first cooling beam 6 and possibly also other cooling beams 7, the impact area in which the respective full beam 10 impinges on the rolling stock 3 can be significantly enlarged. The non-uniformities in the cooling of the rolling stock 3 can thereby be reduced. However, the other advantages of full beams 10 remain.

Although the invention has been illustrated and described in detail by the preferred embodiment, the invention is not limited by the examples disclosed and other variations may be derived therefrom by those skilled in the art without departing from the scope of the invention as defined by the claims.

Reference symbol list

1

Finished road

2

rolling stands

3

rolling stock

4

Cooling equipment

5

roll

6, 7

Chilled beams

8, 15

Coolant outlets

9

Water

10

Full beam

11, 16

Cross sections

12

Cross-sectional plane

13

Area

14

Focus

17

Rays

a1, a2

Distance between coolant outlet and coolant outlet

b

Distance between cross-sectional plane and coolant outlet

d

effective width

D

maximum extension

L

straight line

p1, p2

Press

P1

starting point

P2

End point

r

Beam direction

x

Transport direction

y

Width direction

α1, α2

Beam opening angle

β1, β2

angle

γ

Extension angle

Claims (14)

1. Treatment line for a flat, elongate hot metal rolling stock (3),

   - wherein the treatment line comprises a finishing train (1) for rolling the rolling stock (3),

   - wherein the treatment line comprises a cooling device (4),

   - wherein the cooling device (4) is arranged upstream of the finishing train (1), is arranged downstream of the finishing train (1) or is arranged within the finishing train (1),

   - wherein the cooling device (4) comprises a first cooling bar (6) which extends, as seen in a width direction (y) of the rolling stock (3), completely over the rolling stock (3),

   - wherein the first cooling bar (6) comprises a plurality of first coolant outlets (8) facing the rolling stock (3), by means of which water (9) is applied to the rolling stock (3),

   - wherein the first coolant outlets (8) are arranged in the first cooling bar (6) so as to be positionally fixed in at least one row extending in the width direction (y) of the rolling stock (3), and have, within the respective row, a respective predetermined spacing (a1) from one another,

   - wherein the first coolant outlets (8) are in the form of full-jet nozzles, from which a full jet (10) having a respective intrinsically continuous cross section (11) exits during operation,

   - wherein a jet opening angle of the full jet (10) exiting from the full-jet nozzles is at most 5°,

   - wherein the cross sections (11) of the full jets (10) each have a convex envelope,

   characterized
   in that the respective convex envelope contains at least one region (13) which is not contained in the respective full jet (10) itself.
2. Treatment line according to Claim 1,
   characterized
   in that the first cooling bar (6) is in the form of an intensive cooling bar, with the result that the water (9) exits from the first coolant outlets (8) with a pressure (p1) of at least 1 bar, in particular with a pressure (p1) of between 1.5 bar and 4 bar.
3. Treatment line according to Claim 1,
   characterized
   in that the first cooling bar (6) is in the form of a laminar cooling bar, with the result that the water (9) exits from the first coolant outlets (8) with a pressure (p2) of at most 0.5 bar, in particular with a pressure (p2) of between 0.1 bar and 0.4 bar.
4. Treatment line according to Claim 1, 2 or 3,
   characterized
   in that the cross sections (11) of the full jets (10) are each closed in an annular manner.
5. Treatment line according to Claim 1, 2 or 3,
   characterized
   in that the cross sections (11) of the full jets (10) are each in the form of part of a respective circular ring.
6. Treatment line according to Claim 1, 2 or 3,
   characterized
   in that the cross sections (11) of the full jets (10) are each of V-shaped or zigzag-shaped form.
7. Treatment line according to one of the above claims,
   characterized

   - in that the respective convex envelope has, as seen in the cross-sectional plane (12), a maximum extent (D),

   - in that the respective cross section (11) has, as seen in the cross-sectional plane (12), a maximum effective width (d), and

   - in that the ratio of the maximum extent (D) to the maximum effective width (d) is greater than 3:1, in particular greater than 5:1.
8. Treatment line according to one of the above claims,
   characterized

   - in that the cooling device (4) comprises at least one second cooling bar (7),

   - in that the second cooling bars (7) extend, as seen in the width direction (y) of the rolling stock (3), completely over the rolling stock (3) and each have a plurality of second coolant outlets (15) facing the rolling stock (3), by means of which water (9) is applied to the rolling stock (3),

   - in that the second coolant outlets (15) are arranged in the second cooling bar (6) so as to be positionally fixed in at least one row extending in the width direction (y) of the rolling stock (3),

   - in that the second coolant outlets (15) have, within the respective row, a respective predetermined spacing (a1) from one another, and

   - in that the second cooling bars (7) are arranged, as seen in a transport direction (x) of the rolling stock (3), downstream of the first cooling bar (6).
9. Treatment line according to Claim 8,
   characterized
   in that the second coolant outlets (15) of at least one of the second cooling bars (7) are arranged, as seen in the width direction (y) of the rolling stock (3), between the first coolant outlets (8) of the first cooling bar (6).
10. Treatment line according to Claim 8 or 9,
    characterized

    - in that the second coolant outlets (15) of at least one of the second cooling bars (7) are in the form of full-jet nozzles, from which a full jet (10) having a respective cross section (11) exits during operation,

    - in that the cross sections (11) of these full jets (10) each have a convex envelope, and

    - in that this respective convex envelope contains at least one region (13) which is not contained in the respective full jet (10) itself.
11. Treatment line according to Claim 8 or 9,
    characterized

    - in that the second coolant outlets (15) of at least one of the second cooling bars (7) are in the form of full-jet nozzles, from which a full jet having a respective cross section exits during operation,

    - in that the cross sections of these full jets each have a convex envelope, and

    - in that this respective convex envelope corresponds to the cross section of the respective full jet.
12. Treatment line according to Claim 8 or 9,
    characterized
    in that the second coolant outlets (15) of at least one of the second cooling bars (7) are in the form of fan nozzles or spray nozzles.
13. Method for finish-rolling and cooling a flat, elongate metal rolling stock (3) in a treatment line according to one of the preceding claims, comprising the following method steps:

    - hot rolling the rolling stock (3) in the finishing train (1) of the treatment line;

    - cooling the at least partially hot-rolled rolling stock (3) in a cooling device (4) of the treatment line, wherein water is used to cool the rolling stock (3), in the width direction thereof, by way of a plurality of full jets (10), wherein a plurality, preferably all, of the full jets (10) contain a respective convex envelope comprising at least one region (13) which is not contained in the respective full jet (10) itself.
14. Method according to Claim 13, characterized in that the rolling stock is wound up to form a coil after cooling.

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