DE102018203218A1 - Roll stand for a hot rolling mill - Google Patents

Abstract

The invention relates to a rolling stand (1) for a hot rolling mill, comprising at least one upper work roll (2) which can be turned against a rolling stock, at least one inlet side or outlet side guide unit (5, 6) for guiding the rolling mill (1) entering or from the rolling stand Rolling stand (1) expiring rolling stock and at least one with the guide unit (5, 6) connected, controllable Anstelleinheit (7, 8), wherein the guide unit (5, 6) at least one roller-near guide element (9, 10) with a fixed angle and at least one having the Anstelleinheit (7, 8) and articulated with the roller-near guide element (9, 10) connected remote from the roller guide element (12, 13), and wherein an angle (α ₁ , α ₂ ) of the roller remote guide element (12, 13) by means of Adjustment unit (7, 8) is variable. In order to reliably thread and roll highly deformed rolling stock into a roll gap of the roll stand (1), the roll stand (1) has at least one control electronics (28) connected to the setting unit (7, 8), which is set up, the setting unit ( 7, 8), taking into account at least one rolling stock parameter (P ₁ ), at least one rolling parameter (P ₂ ) and / or at least one descaling parameter (P ₃ ).

Description

The invention relates to a rolling stand for a hot rolling mill, comprising at least one upper working roll which can be turned against a rolling stock, at least one inlet-side or outlet-side guide unit for guiding the rolling stock entering or leaving the rolling mill and at least one controllable adjusting unit connected to the guiding unit. wherein the guide unit has at least one guide element close to the roller with a fixed angle of attack and at least one roller-remote guide element connected to the adjusting unit and hinged to the guide element close to the roller, and wherein an angle of attack of the guide element remote from the roller can be varied by means of the adjusting unit.

In a rolling stand, an inlet guide and an outlet guide for guiding a rolling stock entering or leaving the rolling stand are usually arranged between bars of roll stands of the rolling mill stand. In the area of these guides, various spray bars and / or cooling bars with spray nozzles can be arranged, which can be used, for example, for cooling work rolls and / or backup rolls of the roll stand, for suppressing haze in the area of a roll gap of the roll stand or for descaling the material. The guides are employed according to the roll diameters of an upper work roll of the rolling stand and are mitverlagert when vertical adjustment of the upper work roll to the required nip height accordingly. Especially with heavy plate stands and roughing stands with incoming rolling stock thicknesses of up to 800 mm and pre-formed rolling stock with incoming skis with a thickness of up to 200 mm, the inlet guides are exposed to the highest loads, which are significantly higher than loads occurring in a finishing train.

A conventional construction of the guides has a guide plate for each guide with a fixed angle at which a spray bar is arranged. Due to the angle of attack of the guide plate relative to a rolling line or the rolling stock, the rolling stock is guided by means of the inclined guide plate in the nip. At present, there are different types of inlet guide and outlet guide, which differ, inter alia, by different fixed angles of attack of the respective baffle relative to the rolling line, especially in rough roads and finishing streets differences in stability and mobility are obvious.

Designs in which the baffle has a steep fixed angle lead to a more reliable threading of the rolling stock in the nip. In this design, however, the descaling is usually arranged very close to the roll gap, so that a small distance of the Entzunderungsdüsen reaches the rolling stock and thus the surface of the rolling stock can be reliably descaled. The arrangement of the descaling close to the nip, however, brings two major disadvantages. On the one hand, a complex sealing of the Entzunderungsspritzdüsen in the guide plate is necessary so that the water of the roller cooling can not flow to the rolling stock. On the other hand, components such as the uprights, which are arranged in this area, are exposed to the abrasive effect of the descaling water reflected by the rolling stock. For this reason, the use of this type of inlet guide and the outlet guide is avoided in most cases.

In designs in which the guide plate has a flat, fixed angle of attack, the descaling is arranged at a greater distance to the mill center or to the nip. In these types, however, a collision of the rolling stock with the guide plate may occur without the rolling stock being guided into the roll gap. In particular, the case may occur that the rolling stock does not pass under the baffle due to excessive deformation and thus can not be guided into the nip.

DE 199 46 946 A1 discloses a guide device for introducing rolling stock into a roll gap of a roll stand or for stripping the rolling stock of rolls of the roll stand. In the guide device in each case above and below a central plane of the roll gap in the direction of the roll gap displaceable and optionally pivotable guide elements are arranged on a carrier connected to the rolling stand. The guide elements are connected by pairs of, with horizontal spacing in the rolling direction successively arranged, rotatable adjustable and fixable eccentric bolt with the carrier.

EP 7 454 440 A1 discloses a hot rolling plant for rolling flat material, having a plurality of rolling stands, which have inclined and the rolling path of the flat material vertically surrounding Flachgutführungselemente. A roughing stand has a first roller at least at its outlet side, the next following rolling stand is provided with a second roller at least at its inlet side. Each roller is arranged in the vicinity of the associated Flachgutführungselements and for suppressing a floating of the slab in a desired position can be raised and lowered.

JP 58 081 509 discloses a baffle for guiding a rolling stock entering a rolling stand. An angle of attack of the baffle is variable by means of an actuator. At the baffle inlet side a hold-down roller is arranged.

JP S61 102 305 U . JP 62 54 516 and KR 973 902 each disclose a two-part guide unit for guiding a rolling stock entering a rolling stand. An angle of attack of a remote part of the guide unit is variable by means of an adjusting unit. An angle of attack of a roll near arranged part of the guide unit can not be varied. On the guide unit, a hold-down roller is arranged on the inlet side.

JP 2010 240 660 A and JP 2013 123 736 A each disclose an adjustably arranged descaling unit for a rolling stand.

JP 2013 240 829 A discloses a two-part guide unit for guiding a rolling stock entering a rolling stand. An angle of attack of a part of the guide unit arranged close to the roll can be varied by means of an adjusting unit. An angle of attack of a remote from the roll portion of the guide unit can not be varied.

An object of the invention is to reliably thread heavily deformed thicker rolling stock into a roll nip of a roll stand and to be able to roll, as is required in particular for heavy plate stands and roughing stands.

This object is solved by the independent claim. Advantageous embodiments are given in the following description, the dependent claims and the figure, these embodiments each taken alone or in various combinations of at least two of these embodiments can represent each other a further developing, especially preferred or advantageous, aspect of the invention.

A rolling stand for a hot rolling mill according to the invention has at least one upper working roll which can be set against a rolling stock, at least one inlet-side or outlet-side guide unit for guiding the rolling stock entering the rolling stand or leaving the rolling stand and at least one controllable setting unit connected to the guiding unit. The guide unit has at least one guide element close to the roller with a fixed angle of attack and at least one roller-remote guide element connected to the adjusting unit and hinged to the guide element close to the roller, whereby an angle of attack of the roller-remote guide element can be varied by means of the adjusting unit. Furthermore, the rolling stand has at least one control electronics connected to the adjusting unit, which is set up to control the adjusting unit taking into account at least one rolling stock parameter, at least one rolling parameter and / or at least one descaling parameter.

Due to the inventive variability of the angle of attack of the roller remote guide element, the rolling mill can be easily adapted to the respective rolling stock or its geometry. In particular, can be ensured by the variability of the angle of attack of the roller remote guide element secure threading of thick and / or highly deformed rolling stock in the roll stand or its roll gap. In this respect, the rolling mill according to the invention is particularly suitable for use as heavy plate or Vorgeruste. It can thus be done according to the invention, an adjustment of the angle of attack of the roller remote guide element to the respective size or strength of the deformation of the rolling stock. Thus, with the invention, downtime or interruptions of a rolling process can be reduced, which are caused by failure of the threading operation of rolling stock into the roll gap.

By controlling the adjusting unit by means of the control electronics taking into account at least one rolling stock parameter, at least one rolling parameter and / or at least one Entzunderungsparameter the employment of the roller remote guide element can be adapted to the particular circumstances and requirements. The control electronics can be set up to determine an optimum angle of attack of the roller-remote guide element from at least one of the mentioned parameters and to actuate the adjusting unit accordingly.

A rolling stock parameter in the sense of the invention is a physical or geometric property of the rolling stock, such as its thickness, width, shape, temperature, strength value etc. A rolling parameter in the sense of the invention is a setting of the rolling mill for the forming, such as the height of the rolling mill Rolling gap, the rolling force, the forming speed, etc .. A Entzunderungsparameter in the context of the invention is a process parameter for surface control of the rolling stock, such as the adjustment of the height of the Entzunderungsspritzbalkens over the rolling stock, the applied amount of Entzunderungswassers etc ..

According to the invention, the angle of attack of the roller-remote guide element can be adjusted in a simple manner variable to the respective process requirements. This adjustment can also take place during a rolling process, which makes the rolling process more flexible. In particular, the adjustment of the angle of attack of the roller remote guide element with decoupled Movements are realized, each having a low complexity. Due to the variability of the angle of attack of the roller-remote guide element, in addition to the, in particular vertical, linear adjustability of the guide unit, a second degree of freedom of movement of the roller-remote guide element is obtained via a setting of the positioning element.

In addition, the invention is preferably realized such that interfaces of the components of the roll stand with surrounding components or assemblies of the roll stand, such as the vertical guide in the rolling stand and the transition from the guide unit to a rolling mill of the rolling mill, compared to conventional rolling mill types largely unchanged stay. In this way, an already existing rolling mill can be rebuilt in the case of modernization or retrofitting with little modification effort to form a mill stand according to the invention.

Depending on its arrangement, the guide unit can be used relative to the upper work roll of the roll stand for guiding the rolling stock entering the rolling stand (inlet guide) or rolling out of the rolling stand (outlet guide). The guide unit, in particular its roller-remote guide element, only has the task of guiding the rolling stock. With the guide unit thus the geometry of the rolling stock is not actively influenced or changed.

The roller-near guide element may be formed, for example, as a baffle. The roller-near guide element or the entire guide unit can be moved away from the rollers, for example, swung away, outside of a rolling operation, for example for exchanging the rollers of the rolling stand. The roller-remote guide element is arranged farther away from the upper work roll of the roll stand than the roller-near guide element. The non-destructive detachable or non-destructive releasable articulated connection of the roller-remote guide element to the roller-near guide element, the two guide elements are mechanically coupled together. Due to the articulated connection between the guide elements, a pivot axis extending transversely to the rolling direction and parallel to the rolling stock top is defined, about which the roller-remote guide element is arranged pivotable relative to the guide element close to the roller in order to be able to vary the setting angle of the roller-remote guide element. The roller-remote guide element may be formed, for example, as a baffle.

The electromechanical, hydraulic or pneumatic adjusting unit is supported on the one hand on the roller remote guide element, for example on the roller remote end portion, and on the other hand on a fixed or movable component of the rolling stand.

The rolling mill according to the invention has, in addition to the upper work roll which can be set against the rolling stock, a lower work roll, which may also be adjustable against the rolling stock. The rolling stand according to the invention may also comprise further rollers, for example support rollers for supporting the work rolls. The rolling stand can be designed, for example, as a four-high rolling stand. The rolling mill according to the invention can be used in a hot rolling mill for steel or non-ferrous metals.

According to an advantageous embodiment, the rolling stand has at least one adjustable against the rolling stock descaling spray bar with spray nozzles, wherein the spray nozzles engage in at least one opening on the roller remote guide element. In this way, an optimized descaling of a rolling stock to be machined or processed with the roll stand can be ensured. The control electronics can also bring about an optimized descaling process as a function of at least one of the abovementioned parameters, regardless of whether the descaling spray bar can be set to be active or passive. The descaling or the Entzunderungsspritzbalken is arranged at a relatively large distance from the mill center or to the nip. As a result, during a descaling process, less desiccating water, which has an abrasive effect, reaches the area of components of the roll stand that are close to the roll gap, which reduces the wear of these components. Due to the adjustability of the descaling spray bar against the rolling stock, the distance between the spray nozzles of the descaling spray bar and the rolling stock can be kept relatively low in the rolling stand. This ensures high descaling performance and impact. The descaling spray bar is arranged to be adjustable against the rolling stock such that a, in particular vertical, distance between the descaling spray bar and the rolling stock for varying the descaling power can be varied. The adjusting movement of the descaling bar can in particular be linear. The descaling spray bar is supplied with descaling water which exits from the spray nozzles of the descaling bar and impinges vertically or otherwise transversely on the rolling stock. The spray nozzles are spaced from each other in Walzgutquerrichtung spaced apart on the Entzunderungsspritzbalken. Since the spray nozzles in the opening or in each case a separate opening on the remote roller bearing guide element, the distance of the spray nozzles to the rolling stock is relatively low, especially if the angle of attack of the roller remote guide element is reduced after threading of the rolling stock in the rolling mill. Characterized in that the pivoting movement of the roller remote guide element can also be carried out while the rolling stock is in engagement with the rollers, after successful threading of the rolling stock in the roll stand, the angle of attack of the roller remote guide element can be reduced to optimize the effect of descaling.

According to a further advantageous embodiment, the rolling stand has at least one linearly engageable against the rolling Anstellelement on which the Anstelleinheit is supported and on which the roller near guide element is fixed, and at least one connected to the Anstellelement actuator, with which the Anstellelement against the rolling stock can be adjusted , on. The adjustable against the rolling Anstellbare can be linearly displaceable by means of at least one electromechanical or hydraulic actuator, which may be supported for example on a portion of a rolling mill stand. The employment of the adjusting element can be synchronized with an adjusting movement of the upper work roll of the rolling stand. The roller-near guide element is moved due to its fixation on the Anstellelement at a position of the Anstellelements. In particular, the roller-near guide element can be arranged and fixed on a side of the adjusting element facing the rolling stock. Since the angle of the roller-near guide element is fixed, this angle of attack can not be varied. Therefore, the roller-near guide element can be displaced exclusively together with the Anstellelement. The adjusting unit may for example be a Balancierzylinder which is usually installed to balance an upper support roller in a rolling stand, so that no additional actuator must be installed for hiring the Anstellelements. As a result, the rolling mill is inexpensive to implement, for example by an appropriate retrofitting of an existing rolling stand.

A further advantageous embodiment provides that the roll stand has at least one controllable actuating unit connected to the descaling spray bar and the setting element, with which the descaling spray bar can be set against the rolling stock. As a result, the descaling spray bar can be activated actively and essentially independently of other components of the rolling mill stand. The actuator may comprise at least one electromechanical, hydraulic or pneumatic actuator. The adjusting movement of the Entzunderungsspritzbalkens can be synchronized with the pivoting movement of the roller remote guide element.

According to a further advantageous embodiment of the Entzunderungsspritzbalken is connected to the roller remote guide member such that the Entzunderungsspritzbalken is moved in a displacement of the roller remote guide element. As a result, the descaling spray bar can be made passive and essentially dependent on other components of the rolling stand. Thus, there is no additional adjusting unit for setting the Entzunderungsspritzbalkens available, whereby the rolling stand cost, for example by an appropriate retrofitting of an existing rolling stand, can be realized.

According to a further advantageous embodiment, the adjusting unit and the Entzunderungsspritzbalken are arranged on one of the upper work roll side facing away from the Anstellelements. As a result, in particular the descaling spray bar is arranged at a relatively large distance to the mill center or to the nip, which is associated with the above-mentioned advantage. In addition, the rolling mill center can be shielded by means of the adjusting element, so that no descaling water gets into the vicinity of the rolling mill center.

A further advantageous embodiment provides that the control electronics is set up to control the adjusting unit taking into account at least one Entzunderungsparameter.

A further advantageous embodiment provides that the roll stand has an inlet-side guide unit, an outlet-side guide unit, at least one adjustment unit per guide unit, at least one positioning element per guide unit and at least one descaling spray bar per guide unit. Thereafter, the mill stand on an inlet guide according to the invention and an outlet guide according to the invention, which can be designed or configured as described above. In particular, the inlet guide and the outlet guide may be the same or different. According to a further advantageous embodiment, the rolling stand is a heavy plate frame or a roughing stand.

• 1: eine schematische Darstellung eines Abschnitts eines Ausführungsbeispiels für ein erfindungsgemäßes Walzgerüst.

In the following, the invention will be explained by way of example with reference to the appended FIGURE by way of a preferred embodiment, wherein the features explained below may represent an advantageous or further developing aspect of the invention both individually and in a different technically sensible combination of at least two of these features , It shows:

• 1 : a schematic representation of a portion of an embodiment of a rolling stand according to the invention.

1 shows a schematic representation of a portion of an embodiment of a rolling mill according to the invention 1 in the form of a roughing stand for a not shown hot rolling mill. The rolling stand 1 can be designed as a four-high rolling stand.

The rolling stand 1 has an engageable against a rolling stock, not shown upper work roll 2 , a lower stripper 3 and an upper back-up roll 4 on. The lower stripper 3 can be supported on a lower support roller, not shown.

Furthermore, the rolling stand 1 an inlet-side guide unit 5 for guiding into the mill stand 1 incoming rolling stock and an outlet-side guide unit 6 for guiding the running out of the rolling mill rolling stock.

In addition, the mill stand 1 one with the leadership unit 5 connected, controllable adjustment unit 7 and one with the leadership unit 6 connected, controllable adjustment unit 8th on.

Every leadership unit 5 or. 6 has a roller-near guide element 9 or. 10 with fixed angle of attack and one with the adjusting unit 7 or. 8th and according to the double arrow 11 articulated with the roller guide element 9 or. 10 connected roller-remote guide element 12 or. 13 on. An angle of attack α ₁ or. α ₂ the respective roller remote guide element 12 or. 13 is by means of the respective Anstelleinheit 7 or. 8th variable.

The rolling stand 1 has a linearly engageable against the rolling Anstellelement 14 at which the hiring unit 7 is supported and on which the roller-near guide element 9 is fixed, and a linearly engageable against the rolling Anstellelement 15 at which the hiring unit 8th is supported and on which the roller-near guide element 10 is fixed on. In addition, the mill stand 1 one with the adjusting element 14 connected actuator 16 with which the adjusting element 14 according to the double arrow 17 is adjustable against the rolling stock, and one with the adjusting 15 connected actuator eighteen with which the adjusting element 15 according to the double arrow 17 is adjustable against the rolling stock, on. Each positioning element 14 or. 15 has a bevel on its underside facing the rolling stock 29 or. 30 on to the respective roller remote guide element 12 or. 13 to give sufficient freedom of movement. The respective roller-near guide element 9 or. 10 lies on a rolling beam 31 on.

Furthermore, the rolling stand 1 one against the rolling adjustable at the Anstellelement 14 arranged Entzunderungsspritzbalken 19 with spray nozzles 20 on, with the spray nozzles 20 in at least one opening 21 on the roller remote guide element 12 intervention. The hiring unit 7 and the descaling spray bar 19 are on one of the upper stripper 2 opposite side of the Anstellelements 14 arranged.

In addition, the mill stand 1 one against the rolling adjustable at the Anstellelement 15 arranged Entzunderungsspritzbalken 22 with spray nozzles 23 on, with the spray nozzles 23 in at least one opening 24 on the roller remote guide element 13 intervention. The hiring unit 8th and the descaling spray bar 22 are on one of the upper stripper 2 opposite side of the Anstellelements 15 arranged.

The rolling stand 1 has one with the descaling spray bar 19 and the adjusting element 14 connected, controllable actuator 25 on, with the descaling spray bar 19 according to the double arrow 26 is adjustable against the rolling stock. Alternatively, the descaling spray bar 19 such with the roller remote guide element 12 be connected to that of the descaling spray bar 19 at a displacement of the roller remote guide element 12 is moved.

The rolling stand 1 also has one with the descaling spray bar 22 and the adjusting element 15 connected, controllable actuator 27 on, with the descaling spray bar 22 according to the double arrow 26 is adjustable against the rolling stock. Alternatively, the descaling spray bar 22 such with the roller remote guide element 13 be connected to that of the descaling spray bar 22 at a displacement of the roller remote guide element 13 is moved.

The rolling stand 1 also has one with the hiring units 7 and 8th Connected control electronics 28 which is set up, the hiring units 7 and 8th taking into account at least one rolling stock parameter P ₁ , at least one rolling parameter P ₂ , at least one Entzunderungsparameter P ₃ driving.

LIST OF REFERENCE NUMBERS

1

rolling mill

2

upper stripper

3

lower stripper

4

upper support roller

5

inlet-side guide unit

6

outlet side guide unit

7

Acting unit of 5

8th

Acting unit of 6

9

close rolling guide of 5

10

close rolling guide of 6

11

Double arrow (pivoting of 12 . 13 )

12

roller-remote guide element of 5

13

roller-remote guide element of 6

14

adjusting element

15

adjusting element

16

actuator

17

Double arrow (employment of 14 . 15 )

18

actuator

19

Entzunderungsspritzbalken

20

nozzle

21

Breakthrough on 12

22

Entzunderungsspritzbalken

23

nozzle

24

Breakthrough on 13

25

Actuator for 19

26

Double arrow (employment of 19 . 22 )

27

Actuator for 22

28

control electronics

29

Bevel of 14

30

Bevel of 15

31

roll beam

P ₁

Walzgutparameter

P ₂

rolling parameters

P ₃

Entzunderungsparameter

α ₁

Angle of attack of 12

α ₂

Angle of attack of 13

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19946946 A1 [0006]
• EP 7454440 A1 [0007]
• JP 58081509 [0008]
• JP 61102305 U [0009]
• JP 6254516 [0009]
• KR 973902 [0009]
• JP 2010240660 A [0010]
• JP 2013123736 A [0010]
• JP 2013240829 A [0011]

Claims (9)

Rolling stand (1) for a hot rolling mill, comprising at least one upper work roll (2) which can be set against a rolling stock, at least one inlet-side or outlet-side guide unit (5, 6) for guiding the rolling mill (1) entering from the rolling stand (1) expiring rolling stock and at least one with the guide unit (5, 6) connected, controllable Anstelleinheit (7, 8), wherein the guide unit (5, 6) at least one roller-near guide element (9, 10) with a fixed angle and at least one with the Anstelleinheit ( 7, 8) and articulated with the roller-near guide element (9, 10) connected remote from the roller guide element (12, 13), and wherein an angle (α ₁ , α ₂ ) of the roller remote guide element (12, 13) by means of the Anstelleinheit (7, 8) is variable, characterized by at least one with the Anstelleinheit (7, 8) connected control electronics (28) which is arranged, the Anstelleinheit (7, 8) taking into account at least ns a rolling stock parameter (P ₁ ), at least one rolling parameter (P ₂ ) and / or at least one Entzunderungsparameter (P ₃ ) to control. Roll stand (1) according to Claim 1 , characterized by at least one Entzunderungsspritzbalken (19, 22) arranged with spray nozzles (20, 23) against the rolling stock, wherein the spray nozzles (20, 23) in at least one opening (21, 24) on the roller remote guide element (12, 13) intervention. Roll stand (1) according to Claim 1 or 2 characterized by at least one positioning element (14, 15) which can be raised linearly against the rolling stock, on which the setting unit (7, 8) is supported and on which the guide element (9, 10) close to the roller is fixed, and at least one with the positioning element (14 , 15) connected adjusting unit (16, 18), with which the adjusting element (14, 15) against the rolling stock can be adjusted. Roll stand (1) after a Claims 1 to 3 characterized by at least one controllable actuating unit (25, 27) connected to the descaling spray bar (19, 22) and the adjusting element (14, 15), with which the descaling spray bar (19, 22) moves relative to the positioning element (14, 15) the rolling stock is adjustable. Roll stand (1) according to one of Claims 1 to 3 , characterized in that the Entzunderungsspritzbalzen (19, 22) is so connected to the roller remote guide element (12, 13) that the Entzunderungsspritzbalken (19, 22) is moved in a displacement of the roller remote guide element (12, 13). Roll stand (1) according to one of Claims 1 to 5 , characterized in that the adjusting unit (7, 8) and the Entzunderungsspritzbalken (19, 22) on one of the upper work roll (2) facing away from the Anstellelements (14, 15) are arranged. Roll stand (1) according to one of Claims 1 to 6 , characterized in that the control electronics (28) is adapted to control the Anstelleinheit (7, 8) taking into account at least one Entzunderungsparameter (P ₃ ). Roll stand (1) according to one of Claims 1 to 7 characterized by an inlet-side guide unit (5), an outlet-side guide unit (6), at least one adjustment unit (7, 8) per guide unit (5, 6), at least one adjustment element (14, 15) per guide unit (5, 6) and at least a descaling spray bar (19, 22) per guide unit (5, 6). Roll stand (1) according to one of Claims 1 to 8th , characterized in that the rolling stand (1) is a heavy plate frame or a roughing stand.

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