EP3074150B1 - Method for heat-treating, and quenching device for cooling plate- or web-like sheet metal - Google Patents

Description

The invention relates to a quenching device for cooling plate-like or sheet-like metal sheet, with transport means for the continuous transport of the sheet in the direction of passage, each with at least one nozzle body above and below the sheet, wherein the nozzle body at least one connection for introducing the liquid coolant in at least a first nozzle opening, wherein the first nozzle opening is formed as a slot extending transversely to the passage direction and is designed such that the emerging from her coolant jet at a first angle (α) is directed respectively to the top and bottom of the sheet wherein the nozzle body has at least one second nozzle opening or wherein a second nozzle opening is formed in a second nozzle body, wherein the second nozzle opening is formed as a slot extending across the width of the sheet parallel to the first nozzle opening and so is designed such that the emerging from her coolant jet at a second angle (β) is directed respectively to the top and the bottom of the sheet, the first nozzle opening and the second nozzle opening are directed in the direction of passage against each other and in the direction of passage between them a predefined Have distance, wherein there is a guide device for the coolant between the first nozzle opening and the second nozzle opening.

Furthermore, the invention relates to a method for heat treating plate or sheet-shaped metal sheet, wherein the sheet is heated and then transported by means of transport continuously through a quenching device in the direction of passage and cooled with a liquid coolant, wherein with a nozzle body, each having at least one nozzle opening at least one flat jet formed first coolant jet is generated, which extends transversely to the passage direction and at an angle respectively to the top and the bottom of the sheet metal, which is connected to a terminal for introducing the liquid coolant is directed, wherein at least one formed as a flat jet second coolant jet is generated by means of a slot formed as a second nozzle opening, that the second coolant jet over the width of the sheet parallel to the first coolant jet at a second angle (β) is directed respectively to the top and the bottom of the sheet and that the first coolant jet and the second coolant jet are directed in the direction of passage against each other and have a predefined distance in the direction of passage between them.

The JP S59 144513 A and the JP S61 295326 A show similar systems for cooling plate or sheet metal sheet metal. The top and bottom of the sheet are acted upon with cooling water from oppositely directed slit-shaped nozzles. A plate closes the space between the slot-shaped nozzles. The cooling water, which is applied in the direction of the sheet width on the top and bottom of the sheet to be held by means of the oppositely directed nozzles to cool both sides of the sheet with the same degree. In the cooling system from the JP S61 295326 A are located in addition to the plate in the direction of passage extending baffles for the cooling water. The preamble of claim 1 is based on JP S59 144513 A ,

The JP S62 260022 A also shows a cooling system in which the top and bottom of the sheet with cooling water from oppositely directed slot-shaped nozzles are applied.

In the GB 2 062 520 A a method for cooling metal sheet is described with water, which is sprayed with nozzles on the sheet, wherein the spray angle is variable.

The JP S 63 238918 A shows a cooling system in which a first and a second guide plate forms a flow channel for cooling water, whose cross-section is variable.

For hardening of heavy plate steel furnace systems are used, to which a continuous quenching device, also called Durchlaufquette, followed. The sheets to be cooled usually have a thickness of 2mm to 250mm. The sheets, which are first heated to Austenitisierungstemperatur, typically at 850 ° C to 950 ° C, are cooled in practice in a continuous process with a cooling medium, usually water, very quickly to produce a martensitic or bainitic structure. During the cooling process, both the top and bottom of the sheets is cooled. During cooling, the sheets are transported by means of transport, usually rollers, continuously in the direction of passage through the quenching device. The sheet runs between upper and lower rollers, which are arranged in pairs spaced in the direction of passage from each other.

For rapid cooling, nozzle bodies with a slot-shaped nozzle opening are used. The slot-shaped nozzle opening is also called slot nozzle. The nozzle opening may extend over the entire width of the sheet. From practice, it is known to use three over the width of the sheet in series juxtaposed nozzle openings to the sheet over its width with different To deter speed or intensity and / or duration.

A device for cooling plate or sheet material by generating a flat jet, which is directed to the material to be cooled, is for example from EP 1 420 912 B1 known. Such a device is also called slot nozzle in practice. A nozzle body has a port for introducing a liquid coolant into a nozzle opening from which the cooling medium exits to cool the plate. The nozzle opening is formed between plane-parallel surfaces. The nozzle body is designed in its interior such that the cooling medium does not occur vertically on the sheet, but obliquely at an angle of attack.

In order to ensure that no water vapor film can form between the still very hot metal sheet and the inflowing water, the cooling water must act on the disc to be quenched with a high exit pulse. Therefore, the cooling water is under increased pressure. A water vapor film would prevent the direct contact of the sheet surface with the cooling water and significantly reduce quenching rates. This phenomenon is known in the art as a Leidenfrost problem and, for example, applies to all quenching operations carried out with the help of water basins.

To quench a sheet in a continuous process, its top and bottom must be cooled. Therefore, a nozzle opening or slot nozzle or a plurality of nozzle openings or slot nozzles arranged side by side over the width of the sheet is or are required on each side of the sheet. At least one nozzle opening extending across the width of the sheet is directed from above onto the upper side of the sheet and a further nozzle opening is directed onto the sheet on the opposite side from below. In Fig. 1 is shown in a schematic representation of a longitudinal section of a quenching device according to the prior art.

On the top of the sheet, the water jams because it can not flow off fast enough laterally to the sheet edges. The water, which is applied to the underside of the sheet, flows downwards due to gravity. Therefore, the top and bottom are cooled under unequal cooling conditions.

It has been attempted to compensate for the unequal cooling conditions by cooling the top and bottom of the sheet with different amounts of water. It has been shown that a homogenization of the quenching conditions can not be achieved with it. In the EP 1 428 589 A1 various variants are described, with which the water deficit should be compensated from below. It is proposed, for example, to use from the bottom of the triple nozzle number or install a pool with several vertical nozzles from below. It has been found that these approaches are not suitable to create equal cooling conditions when cooling the sheet from above and below.

The object of the invention is therefore to improve a quenching device and a method of the type mentioned above so that the disadvantages of the prior art are avoided and that sheets, especially plates under the same Abkühlverhältnissen be cooled from above and below.

According to the invention, the object is achieved by a quenching device for cooling plate-like or sheet metal, with transport means for the continuous transport of the sheet in the direction of passage (D), each with at least one nozzle body above and below the sheet, the nozzle body at least one Having a connection for introducing the liquid coolant into at least a first nozzle opening, wherein the first nozzle opening is formed as a slot extending transversely to the passage direction (D) and is designed such that the exiting from her coolant jet at a first angle (α) is directed respectively to the top and the bottom of the sheet, wherein the nozzle body has at least one second nozzle opening or wherein a second nozzle opening is formed in a second nozzle body, wherein the second nozzle opening is formed as a slot over the width of the sheet parallel to the first en nozzle opening and is designed such that the emerging from her coolant jet at a second angle (β) is directed respectively to the top and bottom of the sheet, the first nozzle opening and the second nozzle opening in the direction of passage (D) against each other are and in the passage direction (D) between them a predefined distance (A), wherein between the first nozzle opening (10, 15) and the second nozzle opening (11, 17) is a guide device for the coolant, characterized in that the Guide device extends over the width of the sheet at least up to the sheet edges and to the top and bottom of the sheet a predefined distance (H) and each with the top and bottom of the sheet (6) a channel-shaped open at the sheet edges space for the Forms coolant and that the Guide device is designed so that the channel-shaped space for the coolant in the direction of the sheet edges has a steadily increasing cross-section, such that the flow velocity (v) of the transverse to the passage direction of the sheet coolant flowing over the width of the sheet is substantially constant.

The first and the second nozzle openings are directly opposite each other in the passage direction and run parallel across the width of the metal sheet. The impact surface of the two coolant steel is rectangular or linear. The beam width can vary. Between the first and the second coolant jet, a cooling zone acted upon with coolant forms on the upper side and the lower side, in which the metal sheet is intensively cooled.

The invention solves the problem of unequal cooling conditions by two in the direction of passage against each other directed slot-shaped nozzle openings or slot nozzles. Over the width of the sheet, the nozzle openings extend parallel to each other. The invention is based on the finding that the high exit pulse of the second coolant jet, which is directed against the first coolant jet, which also impinges with a high exit pulse on the sheet, prevents the cooling medium from accumulating and then undesirably flows uncontrollably, inter alia in the direction of flow. The high-energy coolant jets, which are directed in the direction of passage of the sheet directly against each other, generate on the sheet surface two mutually directed vortex and a double vortex. Experiments with nozzles that extend over the entire width of the sheet have shown that this double vortex is formed over the entire width of the sheet substantially stable. In this way, a uniform cooling over the width of the sheet and on the top and bottom of the sheet is achieved. The coolant flows in a controlled manner in the direction of the sheet edges due to the mutually directed exit pulses of the two coolant jets.

By means of the guide device, a preferred direction is impressed on the flow of the water to be removed. The guide device is designed so that the channel-shaped space for the coolant in the direction of the sheet edges has a steadily increasing cross-section, such that the flow velocity of the coolant flowing transversely to the passage direction of the sheet is substantially constant over the width of the sheet. In this way, uniform quenching conditions are achieved over the width of the sheet. On the underside of the sheet, the guide is used to prevent water from flowing down.

It is particularly advantageous if the distance of the guide device to the top and bottom of the sheet is adjustable. The distance of the guide from the top may differ from the distance of the guide from the bottom.

A further development of the invention is characterized in that the guide device has at its ends open toward the sheet edges in dependence on the sheet width adjustable guide elements, which are designed such that the flow of the coolant is directed over the sheet edges.

Preferably, the transport of the sheet through the quenching means by means of a roller conveyor, wherein the transport means are formed as a plurality of upper and lower rollers having a distance in the passage direction relative to each other, wherein the distance between the first and the second nozzle opening in the passage direction is smaller as the distances between three rollers adjacent in the direction of passage. Preferably, the distance A substantially corresponds to the distance between two rollers adjacent in the direction of passage.

The nozzle body can be made in two parts depending on the available space, wherein the distance between the two nozzle openings can be varied. Therefore, in the context of the invention, the first nozzle opening in a first nozzle body and the second nozzle opening are formed in a second nozzle body. Each nozzle body has a port for separately introducing the liquid coolant into the first and second nozzle openings.

Advantageously, the first and the second nozzle opening or the first and the second nozzle body are configured such that the first angle and the second angle are in each case between 10 ° and 45 °, preferably between 20 ° and 30 °. The first and second nozzle openings could be at a corresponding angle to the surface of the sheet. Alternatively, the entire nozzle body could be suspended and tilted about a tilt axis.

In an advantageous embodiment of the invention, the first and the second nozzle opening or the first and the second nozzle body are configured such that the first angle and / or the second angle are adjustable.

The invention offers the advantageous possibility that the height of the slot formed as the first and the second nozzle opening is adjustable.

An advantageous development is characterized in that between the first and the second nozzle opening, at least one support roller acts on the upper side and the lower side of the metal sheet. This prevents the sheet from sagging during quenching. Furthermore, any possible collisions of the sheet with the nozzle are avoided by the support rollers, if the beginning (head) of the sheet is bent due to production up or down.

The object is further achieved by a method for heat treating plate or sheet-metal sheet metal, wherein the sheet is heated and then transported by means of transport continuously through a quenching device according to one of claims 1 to 9 in the direction of passage (D) and cooled with a liquid coolant is, with a nozzle body, which is respectively arranged above and below the sheet and which has at least one slot formed as nozzle opening, which is connected to a terminal for introducing the liquid coolant, at least one flat jet formed as a first coolant jet is generated, wherein the first coolant jet extends transversely to the passage direction (D) and is directed at a first angle (α) respectively to the top and the bottom of the sheet, wherein at least one formed as a flat jet second coolant jet by means of a slit n second nozzle opening is generated, that the second coolant jet over the width of the sheet parallel to the first coolant jet at a second angle (β) is directed respectively to the top and the bottom of the sheet and that the first coolant jet and the second coolant jet in the direction of passage (D) are directed against each other and in the direction of passage (D) between them a predefined distance (A), characterized in that the speeds of the first and the second coolant jet between 5 m / s and 60 m / s, preferably between 20 m / s and 35 m / s.

The coolant jets emerging from the first and the second nozzle openings form a cooling zone acted upon with coolant between them on the upper side and the lower side of the metal sheet. The predefined distance A thus corresponds to the length of the cooling zone in the direction of passage.

The velocity of the coolant jets at the exit from the nozzle orifice in each case substantially corresponds to the impact speed of the coolant jets on the sheet. Between the two coolant jets, which are directed against each other impinging on the sheet, formed on the top and the bottom of a respective cooling zone with high heat transfer and substantially the same cooling conditions. This ensures optimum cooling of the top and bottom of the sheet.

The coolant jets emerging from the nozzle openings strike the sheet at an angle of attack obliquely. Preferably, the first angle between the first coolant jet and the surface of the sheet and the second angle between the second coolant steel and the sheet metal surface are each between 10 ° and 45 °, preferably between 20 ° and 30 °. The two angles can be adjusted depending on the respective conditions on site.

The invention will be explained in more detail below with reference to preferred embodiments in conjunction with the drawings.

• Fig. 1 in schematischer Darstellung einen Längsschnitt durch eine Abschreckeinrichtung nach dem Stand der Technik;
• Fig. 2 in schematischer Darstellung einen Längsschnitt durch eine erste Ausführungsform einer Abschreckeinrichtung nach der Erfindung;
• Fig. 3 in schematischer Darstellung einen Schnitt durch die erste Ausführungsform einer Abschreckeinrichtung nach Fig. 2 quer zur Durchlaufrichtung des Bleches;
• Fig. 4 in schematischer Darstellung einen Längsschnitt durch eine zweite Ausführungsform der Abschreckeinrichtung nach der Erfindung;
• Fig. 5 in schematischer Darstellung einen Schnitt durch die zweite Ausführungsform einer Abschreckeinrichtung quer zur Durchlaufrichtung des Bleches;
• Fig. 6 in schematischer Darstellung einen Schnitt durch eine dritte Ausführungsform einer Abschreckeinrichtung quer zur Durchlaufrichtung des Bleches.

Show it:

• Fig. 1 in a schematic representation of a longitudinal section through a quenching device according to the prior art;
• Fig. 2 in a schematic representation of a longitudinal section through a first embodiment of a quenching device according to the invention;
• Fig. 3 in a schematic representation of a section through the first embodiment of a quenching device according to Fig. 2 transverse to the direction of passage of the sheet;
• Fig. 4 in a schematic representation of a longitudinal section through a second embodiment of the quenching device according to the invention;
• Fig. 5 a schematic representation of a section through the second embodiment of a quenching device transverse to the direction of passage of the sheet;
• Fig. 6 in a schematic representation of a section through a third embodiment of a quenching device transverse to the direction of passage of the sheet.

Fig. 1 schematically shows a quenching device according to the prior art. A first nozzle body 1 has a connection 2. The connection 2 serves to introduce a liquid coolant 3, in this case water, into at least one first nozzle opening 4, which is directed onto the upper side 5 of a metal sheet 6. The upper first nozzle opening 4 is formed as a slot and extends transversely to the passage direction D over the entire width of the sheet 6. The first nozzle opening 4 is designed such that the exiting cooling water jet at an angle α directed to the top 5 of the sheet 6 is. Transport means 8 in the form of rollers serve for the continuous transport of the sheet 6 in the direction of passage D.

Below the sheet 6, the same components as above the sheet are arranged. The same components are each provided with the same reference numerals.

In Fig. 1 It is shown that the cooling water 3, which is hatched, jams on the upper side 5 of the sheet 6. The water accumulating on the upper side 5 of the sheet 6 flows uncontrollably in all directions, so that it can not be guaranteed that the sheet 6 is uniformly quenched across the width. The cooling water 3, which is applied to the underside 7 of the sheet 6, flows downward, so that the cooling conditions on the top 5 and the bottom 7 of the sheet 6 differ from each other, which adversely affects the heat treatment.

In Fig. 2 is shown schematically a longitudinal section through a first embodiment of a quenching device according to the invention. A nozzle body 9 has a first nozzle opening 10, which is directed at a first angle α on the upper side 5 of the sheet 6. A second nozzle opening 11 is directed at a second angle β on the upper side 5 of the sheet 6. The first nozzle opening 10 and the second nozzle opening 11 are directed in the direction of passage against each other and have a predefined distance A from each other in the direction of passage. As in the prior art transport means 8a, 8b serve in the form of rollers for the continuous transport of the sheet 6 in the direction of passage D. A plurality of upper rollers 8a and lower rollers 8b form a roller conveyor. The rollers have in the direction of passage D a distance R relative to each other. The distance A between the first nozzle openings 10 and the second nozzle opening 11 is smaller than the distance between three adjacent rollers in the direction of passage D and corresponds in the embodiment substantially a distance between two rollers 8a and 8b adjacent in the direction of passage D.

The nozzle body 9, which is located above the sheet 6, has a connection 12 for introducing a liquid coolant, in this case water, into the first nozzle opening 10 and the second nozzle opening 11. The connection 12 is connected to a water supply, not shown. With pumps, not shown, the pressure of the water is increased.

The first nozzle opening 10 and the second nozzle opening 11 are formed as slots and extend transversely to the passage direction D over the entire width of the sheet 6. The first nozzle opening 10 and the second nozzle opening 11 extend parallel to each other across the width of the sheet. The cooling water jets emerging from the first nozzle opening 10 and the second nozzle opening 11 form between them a cooling zone acted upon by cooling water on the upper side 5 of the sheet 6.

The first nozzle opening 10 and the second nozzle opening 11 are configured such that the first angle α and the second angle β are between 10 ° and 45 °, preferably between 20 ° and 30 °. Furthermore, the angle α and the angle β are adjustable.

The height of the slot formed as the first nozzle opening 10 and the second nozzle opening 11 is adjustable.

Between the first nozzle opening 10 and the second nozzle opening 11 is a guide device 13, which channels the coolant. The guide device 13 is spaced from the top 5 and the bottom 7 of the sheet 6. The predefined distance H of the guide from the top 5 and bottom 7 of the plate 6 is adjustable. The guide extends over the width of the sheet at least up to the sheet edges and forms a channel-shaped at the sheet edges open space for the coolant.

In Fig. 2 is below the sheet 6, a different structural design as shown on the top 5 of the sheet 6. On the bottom 7 but also the construction shown above the sheet 6 could be set up.

In Fig. 2 It is shown that a first nozzle body 14 is directed with a first nozzle opening 15 against the underside 7 of the sheet 6. A second nozzle body 16 has a second nozzle opening 17. The second nozzle opening 17 is directed against the first nozzle opening 15. The cooling water jets emerging from the first nozzle opening 15 and the second nozzle opening 17 form between them a cooling zone acted upon by cooling water on the underside 7 of the sheet 6.

The structure of the lower second nozzle opening 17 corresponds to the upper second nozzle opening 11 and extends like this transversely to the passage direction D and is designed such that the coolant jet emerging from it is directed at an angle β on the underside 7 of the sheet 6.

The first nozzle opening 15 and the second nozzle opening 17, which are directed against the underside of the sheet, are located in separate nozzle bodies 14, 16. The first nozzle opening 15 has a first port 18 and the second nozzle opening 17 has a second port 19 for the separate introduction of the liquid coolant into the first nozzle opening 15 and the second nozzle opening 17. The height of the slot formed as the first nozzle opening 15 and the second nozzle opening 17 is in each case adjustable. The first angle α and second angle β, under which the cooling water impinges on the underside 7 of the sheet 6, be between 10 ° and 45 °, preferably between 20 ° and 30 °. Both angles are adjustable. The second nozzle body 14 and the third nozzle body 16 are suspended in a manner not shown and tiltable about a tilt axis.

Between the first nozzle opening 15 and the second nozzle opening 17 is spaced from the bottom 7 of the sheet, a lower guide 20. The lower guide 20 extends at a distance H spaced from the bottom 7 of the sheet 6 over the width of the sheet 6 at least until to the sheet edges and forms a channel-shaped at the sheet edges open space for the coolant. The distance H of the guide device 20 from the bottom 7 of the plate 6 is adjustable.

Fig. 3 shows a schematic representation of a section through the first embodiment of a quenching device Fig. 2 transverse to the direction of passage of the sheet. In Fig. 3 is shown that the guide devices 13, 20 are designed such that the channel-shaped space for the coolant in the direction of the sheet edges has a steadily increasing cross section, such that the flow velocity v of the transverse to the passage direction D of the sheet 6 flowing coolant over the width of the sheet 6 is substantially constant.

Fig. 4 shows a schematic representation of a longitudinal section through a second embodiment of the quenching device according to the invention. In this embodiment, directed on the upper side 5 of the sheet 6 first nozzle opening 15 and a second nozzle opening 17 in separate nozzle bodies 14, 16 are formed. Between the two oppositely directed nozzle openings 15, 17 is located between two rollers 8, a support roller 21. The directed to the bottom 7 components are not shown, because they are identical to the upper components. The support rollers acting on both sides of the metal sheet 6 prevent the sheet 6 from sagging during quenching or, when a new sheet 6 is being threaded in the case of an upwardly bent metal sheet 6, a collision with the nozzle 16 occurs.

Fig. 5 shows a schematic representation of a section through the second embodiment of a quenching device Fig. 4 transverse to the direction of passage of the sheet. In Fig. 5 are like at Fig. 4 only the upper components, namely the support roller 21 and the guide 20 are shown. The components which are arranged in mirror image just below the sheet 6 are not shown.

Fig. 6 shows a schematic representation of a section through a third embodiment of a quenching device transverse to the direction of passage of the sheet. Only the upper components are shown. Below the sheet 6 are identical components. In the Fig. 6 shown guide device 20 has at its open to the sheet edges ends depending on the sheet width adjustable guide elements 22, 23. The adjustable guide elements 22, 23 are designed such that the flow of the coolant is directed over the sheet edges. The position in which the guide elements 22, 23 can be moved is shown in dashed lines.

Modifications are readily possible within the scope of the invention. Thus, it is possible that the nozzle openings in the nozzle body at an angle to the vertical axis of the nozzle body. As a liquid cooling medium, any other suitable cooling medium can be used except water. The guide can be curved.

LIST OF REFERENCE NUMBERS

1

nozzle body

2

connection

3

coolant

4

first nozzle opening

5

Top sheet metal

6

sheet

7

Bottom sheet metal

8th

Mode of Transport

9

nozzle body

10

first nozzle opening

11

second nozzle opening

12

connection

13

guide

14

first nozzle body

15

first nozzle opening

16

second nozzle body

17

second nozzle opening

18

first connection

19

second degree

20

guide

21

supporting role

22

vane

23

vane

A

Distance nozzle openings

D

Throughput direction

H

Distance guide plate

α

first angle between the first coolant jet / sheet

β

second angle between the second coolant jet / sheet

R

Distance rolls

v

flow rate

Claims (11)

1. Quenching device for cooling plate- or web-like sheet metal, having transport means for the continuous transport of the sheet in throughput direction (D), having in each case at least one nozzle body (1, 9, 14) above and below the sheet (6), wherein the nozzle body (1, 9, 14) has at least one port (2, 12, 18) for the introduction of the liquid cooling medium into at least one first nozzle opening (10, 15), wherein the first nozzle opening (10, 15) is formed as a slit, extends perpendicularly to the throughput direction (D) and is configured such that the cooling medium jet emerging out of it is directed at a first angle (a) respectively onto the upper side (5) and the lower side (7) of the sheet (6), wherein the nozzle body (9) has at least one second nozzle opening (11) or wherein a second nozzle opening (17) is formed in a second nozzle body (16), wherein the second nozzle opening (11, 17) is formed as a slit, extends across the breadth of the sheet (6) parallel to the first nozzle opening (10, 15) and is configured such that the cooling medium jet emerging out of it is directed at a second angle (β) respectively onto the upper side (5) and the lower side (7) of the sheet (6), wherein the first nozzle opening (10, 15) and the second nozzle opening (11, 17) in throughput direction (D) are directed against one another and in throughput direction (D) have between them a predefined spacing (A), wherein a guiding device (13, 20) for the cooling medium is located between the first nozzle opening (10, 15) and the second nozzle opening (11, 17), wherein the guiding device (13, 20) extends across the breadth of the sheet (6) at least up to the sheet edges and has a predefined distance (H) to the upper side (5) and to the lower side (7) of the sheet (6) and forms respectively with the upper side (5) and the lower side (7) of the sheet (6) a channel-shaped space, open at the sheet edges, for the cooling medium
   characterised in that the guiding device (13, 20) is configured such that the channel-shaped space for the cooling medium has a cross-section which grows continuously larger in the direction to the sheet edges, such that the flow speed (v) of the cooling medium flowing perpendicularly to the throughput direction of the sheet (6) is substantially constant across the breadth of the sheet (6).
2. Quenching device according to claim 1,
   characterised in that the difference (H) of the guiding device (13, 20) from the upper side (5) and the lower side (7) of the sheet (6) is adjustable.
3. Quenching device according to claim 1 or 2,
   characterised in that the guiding device (13, 20) has, at its ends open to the sheet edges, guiding elements (22, 23) being adjustable depending on the sheet breadth, which are formed such that the flow of the cooling medium is diverted over the sheet edges.
4. Quenching device according to any of claims 1 to 3,
   characterised in that the transport means are formed as a plurality of upper and lower rollers (8), that the rollers (8) in throughput direction (D) have a distance (R) relative to one another and that the spacing (A) between the first nozzle opening (10, 15) and the second nozzle opening (11, 17) in throughput direction (D) is smaller than the distance (R) between three rollers (8) adjacent in throughput direction and preferably is substantially equal to the distance (R) between two rollers (8) adjacent in throughput direction.
5. Quenching device according to any of claims 1 to 4,
   characterised in that the first nozzle opening (15) is formed in a first nozzle body (14) and the second nozzle opening (17) is formed in a second nozzle body (16) and that each nozzle body (14, 16) has a port (18, 19) for the separate introduction of the liquid cooling medium into the first (15) and the second nozzle opening (17).
6. Quenching device according to any of claims 1 to 5,
   characterised in that the first nozzle opening (10, 15) and the second nozzle opening (11, 17) or the first nozzle body (14) and the second nozzle body (16) are formed such that the first angle (α) and the second angle (β) are respectively between 10° and 45°, preferably between 20° and 30°.
7. Quenching device according to any of claims 1 to 6,
   characterised in that the first nozzle opening (10, 15) and the second nozzle opening (11, 17) or the first nozzle body (14) and the second nozzle body (16) are formed such that the first angle (α) and/or the second angle (β) is or are adjustable.
8. Quenching device according to any of claims 1 to 7,
   characterised in that the height of the first nozzle opening (10, 11) formed as a slit and of the second nozzle opening (15, 17) is adjustable.
9. Quenching device according to any of claims 3 to 8,
   characterised in that, between the first nozzle opening (10, 15) and the second nozzle opening (11, 17), in each case at least one support roller (21) acts on the upper side (5) and the lower side (7) of the sheet (6).
10. Method for the heat-treating of plate- or web-like sheet metal,
    wherein the sheet (6) is heated and subsequently transported with transport means continuously through a quenching device according to any of the claims 1 to 9 in throughput direction (D) and cooled with a liquid cooling medium, wherein with a nozzle body (1), which is disposed respectively above and below the sheet (6) and which has at least one nozzle opening (4) formed as a slit, which is connected at a port (2) for the introduction of the liquid cooling medium, at least one first cooling medium jet formed as a flat jet is generated, wherein the first cooling medium jet extends perpendicularly to the throughput direction (D) and is directed at a first angle (α) respectively onto the upper side (5) and the lower side (7) of the sheet (6), wherein at least one second cooling medium jet formed as a flat jet is generated by means of a second nozzle opening (11, 17) formed as a slit, that the second cooling medium jet is directed across the breadth of the sheet (6) parallel to the first cooling medium jet at a second angle (β) respectively onto the upper side (5) and the lower side (7) of the sheet (6) and that the first cooling medium jet and the second cooling medium jet are directed in throughput direction (D) against one another and in throughput direction (D) have a predefined spacing (A) between them, wherein the speeds of the first and the second cooling medium jet are between 5 m/s and 60 m/s, preferably between 20 m/s and 35 m/s.
11. Method according to claim 10,
    characterised in that the first angle (α) and the second angle (β) are respectively between 10° and 45°, preferably between 20° and 30°.

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