EP1234619A2 - Installation and method for the treatment of a metal strip or sheet - Google Patents

Abstract

Device for treating a metal strip or sheet (4) comprises treatment units (1, 2, 3) joined together via coupling units (11, 12) to enable the metal strip to continuously pass through. The treatment units are arranged so that they can be operated independently with a separated strip passage. An Independent claim is also included for a process for treating a metal strip or sheet using the above device. Preferred Features: The treatment units are arranged parallel to each other and have devices for conveying the strip from one unit to another unit so that a meandering strip flow is produced.

Description

The invention relates to a system and a method for the aftertreatment of a Metal strip or sheet, in particular made of steel with at least two treatment units.

It is known to hot rolled strip after hot rolling a post-treatment undergo by cold rolling and surface coating. Cold rolling serves to smooth the surface of the hot-formed strip, a Achieve high dimensional accuracy, higher strength through work hardening or to achieve smaller dimensions. The application of a protective layer serves for corrosion protection of the metal strip surface. Before such protective layers be applied to the strip surface - for example by hot-dip galvanizing can, the surface must be prepared accordingly, which in particular includes the removal of scale or oxide layers. A well known The cleaning process is pickling, in which the metal strip is made using acids is cleaned.

This (post) treatment process is usually carried out in several Steps on several system units, the belt after passing through one each unit is rewound and before going through the next one System unit is uncoiled again. EP 0 863 222 A1 is known as described that pickling the hot strip and reducing the strip to Finished thickness in a separate or permanently coupled to the pickling device Cold rolling mill can take place. Then the cold rolled Coils are wound into bundles and to a remote galvanizing plant transported to be surface-coated there. Furthermore is known from EP 0 863 222 A1, the cold rolling process with the pickling and Galvanizing process in a complete line in a continuous line to couple. The belt treatment plant comprises an inlet part to which a pickling section and a reduction stand for cold rolling as well as directly in line connect a galvanizing part and ends with an outlet part.

Such a coupling of the units pickling, cold rolling mill and coating system is also known from EP 0 613 736 A1. Here, too, the band is in line through the three units connected in series. By this known coupling of cold rolls and coating system is eliminated time-consuming and expensive coil handling.

In addition to this advantage, such a complete system, which has several treatment parts or units in line, but includes the disadvantage of a limited Flexibility because the belt to be treated only the entire system can go through in the given order.

The invention has for its object a system for treating a To provide metal strip and a method that do not have this disadvantage, i.e. offer greater flexibility for the plant operator.

This object is achieved by the system with the features of claim 1 and solved the method with the features of claim 17. Advantageous further developments are described in the subclaims.

According to the invention, the individual are according to the system or the system layout Treatment units can be operated independently as well as coupled. The Treatment units are flexibly connected to one another via coupling units, with both a belt flow through a separate belt treatment unit as well as a continuous band flow through a selected group of treatment units and thus a predetermined sequence of treatment steps is possible.

The treatment units are preferably arranged parallel to one another and are such with coupling units, the means for conveying the tape from one Have treatment unit to a parallel adjacent treatment unit, connected that a meandering tape flow occurs within the system. In this context, meandering means serpentine moving or going through a series of turns that are not necessarily must have the same radius.

The coupling units allow a flexible band flow, starting from from a first treatment unit to an adjacent treatment unit, the does not necessarily have to be immediately adjacent. The respective treatment center, In which the beginning of the line is initiated, the system operator determined as required.

According to a first, particularly preferred, embodiment of the invention each treatment unit is designed as a completely independent or separate unit, by including an inlet part, a process part and an outlet part. The treatment units have a first transition between the Inlet part and the beginning of the process part as well as a second transition between the process part end and the outlet part, the respective coupling units are arranged on at least one of these transitions of each unit. The Band that is supposed to go through different treatment processes in succession, is thus meandering from one part of the process to the next.

This gives the advantage of a high flexibility of the overall system, because each each unit as required, either separately or completely independently of the others Treatment centers can be operated or any chain of treatment centers can be created by the coupling units. On this way, a plant operator can more easily access available and accumulating material Production peaks react.

According to a further development of the first embodiment, each treatment unit depending on the direction from the inlet to the outlet part a basic belt conveying direction. The treatment units are so parallel arranged to each other that the basic belt conveying directions are immediately adjacent Treatment units run in opposite directions, with the end of the process division in each case one treatment unit and the beginning of the process part of an adjacent treatment unit are connected via a common coupling device. For this purpose, the treatment units are parallel to one another at the same height arranged that the inlet part of a treatment unit the outlet part of a corresponds to each other adjacent treatment unit and where the Belt running direction of the individual treatment units is opposite to each other.

According to another development, the units are parallel to each other arranged that the inlet part of one unit the inlet part of another neighboring unit. The tape will - if it is a treatment chain subject is promoted by the process part, then in opposite directions Direction back again in order via coupling means at the beginning of the process part to enter the process part of the neighboring unit. When returning The tape can, for example, when it is no longer exposed to the process part to be transported along the hall ceiling.

A meandering band conveyor takes place in both developments, the turns of the first type are approximately the same size, while after the second type of narrow winding within a first process part a large one Turn to a next process part follows and so on.

The coupling unit can be two immediately adjacent treatment units connect with each other or serves to connect two parallel, but not immediately adjacent, units if, for example, a relative treatment chain to be driven rarely. The coupling of two treatment facilities that are further apart will have a corresponding one Belt guide or deflection reached.

The system according to the invention is preferably a system for Treatment of a metal strip, starting from rolled pre-strip. The attachment comprises at least two treatment units, which are one unit to prepare the belt surface and / or a unit for applying a Protective layer on the strip surface and / or a unit for cold rolling.

Another embodiment of the invention proposes that the units be parallel are arranged offset to each other. It is recommended that the units comprise at least one inlet part and a process part and so arranged are that the process division end of one unit is roughly the same Height with the beginning of the process part of the neighboring unit is arranged by one to allow meandering transition.

A specific embodiment offers a particular advantage. It is suggested, that one unit to prepare the surface and a second unit to apply a protective layer combined, both have an inlet part, while the unit for preparing the surface has no outlet part. It can now be rolled separately in the hot rolled are cleaned in the first unit and then surface-coated in the second unit be, the second unit through the separate entrance optionally equipped with cold strip. The result is a system concept with two separate inlet parts. The advantage of this layout is that it is scaled Hot strip is introduced into the system completely separately from a cold strip and therefore the scale dust does not affect the treatment of the cold strip.

As a means of conveying the belt within the coupling units for deflection of the tape from one treatment unit to the adjacent treatment unit Combinations of roles come into consideration, the band according to different Redirect techniques. After the roll method, the tape is over several rollers arranged one behind the other. She works in a similar way Twist method in which the tape runs through many rolls - in the form of a Loop tower - is redirected. Redirection is also possible with a driven one Roll and twist with a free loop. Preferably point the coupling units on so-called twist rollers.

Such a twist roll is arranged at an angle of 45 ° to the tape running direction. The metal strip is on a helical path around the twist roll guided and deflected by 90 °.

The proposed system layout preferably relates in its entirety on a treatment plant of rolled metal strip, in particular steel strip. Here are all known under unit for preparing the belt surface Means to grasp the strip for cold rolling or in any form Prepare for coating, either by changing the surface geometry and / or for cleaning and / or for activating the metal surface. Coming here mechanical devices, such as grinding in question, as well as thermal Facilities such as flame blasting. Preparation is particularly preferred by cleaning on chemical (e.g. degreasing) or electrochemical Ways, for example pickling) proposed.

The treatment unit for applying a protective layer comprises in particular Means for applying metallic coatings by chemical means, i.e. about Alloy formation and diffusion, such as hot-dip galvanizing or galvannealing. In addition, all other means of applying protective layers are on Metal surfaces included, such as electrodeposition agents Metal coatings or possibly also means for applying organic coatings (Plastic coatings).

The process part of the cold rolling unit comprises at least one cold rolling stand; it is preferably a tandem line, i.e. several in a row arranged roll stands, for example two to five duo or together Four-high stands.

Fig. 1

eine erste Ausführungsform des erfindungsgemäßen Anlagen-Layouts;

Fig. 2

eine Variante der ersten Ausführungsform nach Fig. 1;

Fig. 3

eine zweite Ausführungsform des erfindungsgemäßen Anlagen-Layouts;

Fig. 4

eine erste Variante der Ausführungsform nach Fig. 3;

Fig. 5

eine zweite Variante der Ausführungsform nach Fig. 3;

Fig. 6

eine dritte Ausführungsform des erfindungsgemäßen Layouts;

Fig. 7

eine Variante der dritten Ausführungsform nach Fig. 6;

Fig. 8

eine schematische Darstellung einer Twisterrolle als Teil einer Kopplungseinheit zwischen zwei Behandlungseinheiten mit einer Umlenkungswinkel von 90°;

Fig. 9

ein Layout einer Twisterrolle nach Fig. 8.

Further details and advantages of the invention emerge from the subclaims and from the following description, in which the embodiments of the invention illustrated in the figures are explained in more detail. In addition to the combinations of features listed above, features alone or in other combinations are also essential to the invention. Show it:

Fig. 1

a first embodiment of the plant layout according to the invention;

Fig. 2

a variant of the first embodiment of FIG. 1;

Fig. 3

a second embodiment of the plant layout according to the invention;

Fig. 4

a first variant of the embodiment of FIG. 3;

Fig. 5

a second variant of the embodiment of FIG. 3;

Fig. 6

a third embodiment of the layout according to the invention;

Fig. 7

a variant of the third embodiment of FIG. 6;

Fig. 8

a schematic representation of a twister role as part of a coupling unit between two treatment units with a deflection angle of 90 °;

Fig. 9

a layout of a twister roll according to FIG. 8.

1 shows a system layout with three treatment units arranged parallel to one another 1,2 3, namely treatment units for a hot-rolled pre-strip 4 made of steel. Each treatment unit 1, 2, 3 comprises an inlet part (1E, 2E, 3E), a subsequent process section 1P, 2P, 3P with a process section start 1 Pa, 2Pa, 3Pa and a process division end 1 Pe, 2Pe, 3Pe and one itself adjoining outlet part 1A, 2A, 3A. In all embodiments or Fig. The inlet and outlet parts are designated E and A and the process parts with P. The individual process parts are again of the type that take place in them Process step characterized, with PBV the process part for Belt surface preparation (BV), preferably by means of pickling, PK the process part for cold rolling (K), preferably in a tandem stand, and PAS the Process part for applying a protective layer (AS), preferably by hot-dip galvanizing, designated.

At their ends, ie at the beginning of the process part 1Pa, 2Pa, 3Pa or end of the process part 1Pe, 2Pe, 3Pe, the process parts have transitions 5, 6, 7, 8, 9, 10 from the inlet parts 1E, 2E, 3E or to the outlet parts 1A , 2A, 3A. Coupling units 11, 12 are arranged at these transitions at the points (6, 7, 8, 9) at which a strip flow is to take place continuously into an adjacent process unit.
Such a coupling unit 11, 12, which in the embodiment shown has to deflect the belt through 180 °, preferably consists of two twister rolls (see FIGS. 8 and 9). By means of the coupling units 11, 12 it is achieved that the steel strip is conveyed from the one treatment unit 1 into a subsequent treatment unit 2 without a time-consuming intermediate step, ie without having to wind it up and develop it again.

It is fundamentally essential to the invention that all treatment units 1, 2, 3 as such can also be operated separately, which is ensured by the independent Band course (or arrow course) through each individual treatment unit 1, 2, 3 in the Fig. Is illustrated.

Such a separate treatment is explained using the treatment unit 1. The preliminary strip 4, which is usually wound into a bundle, becomes the strip Pass through the pickling device 1PBV in the inlet part 1E by one or two (not shown) reel device (s) uncoiled, the beginning of the tape with the each end of a coil welded together (not shown) and that Belt conveyed to the process part 1PBV. After passing through the process part 1PBV is the belt 4 within the outlet part 1A of the treatment line, which in turn has a reel device (not shown), cut and into one Coil wound up. This extensive processing is basically intended for each unit are retained, even though they go through for continuous tape flow a selectable treatment step sequence is canceled according to the invention.

According to the embodiment of a layout according to FIG. 1, there are three treatment units 1, 2, 3 arranged parallel to each other so that the basic belt conveying direction (see arrow direction) immediately adjacent treatment units is opposite. The resulting meandering band course is illustrated in FIG. 1 by means of the arrow course.

The coupling of the individual treatment units 1, 2, 3 according to the system layout 1 grants, for example, the production of a galvanized cold strip 13 as the end product with hot rolled pre-strip 4.

2 comprises two treatment units 101 and 103. A unit for pretreatment 101 PBV, here a pickling unit, is with one unit for coating the strip surface 103 PAS, here a hot-dip galvanizing unit, connected by means of a flexible coupling unit 111. Through this Coupling creates a system layout for producing hot-dip galvanized hot strip 114 as the final product.

3, 4 and 5 another type of system layout or Coupling of the different treatment units shown. With this Layout, the treatment units 201, 202, 203 are each arranged so that the inlet part 201E, 202E, 203E of one unit and the inlet part of another immediately adjacent unit. The basic belt conveying direction the treatment centers are in the same direction. The coupling units 211, are on the transitions 205, 208, 209 arranged. A continuous flow of tape To ensure that there are means of reversal at the end of each part of the process 215, 216 of the belt conveyor arranged against the original belt conveyor direction. The band course marked with the arrows clearly shows that a meandering course also occurs in this system layout. The starting product is hot-rolled roughing strip 204, the end product is galvanized Cold strip 213.

The embodiment according to FIG. 3 is varied in that the treatment unit 202 for cold rolling is dispensed with, and the treatment unit 301 for preparation (here pickling unit) directly with treatment unit 303 for coating (here hot-dip galvanizing unit) by means of the coupling unit 311 is coupled. Both hot and cold strip can be used in this system layout 317 for the production of galvanized hot or cold strip 318 are introduced. 5 corresponds to that of FIG. 4 with the difference that that the arrangement of the units 401, 403 is reversed.

The embodiment shown by means of FIG. 6 is a system layout with parallel treatment units 519, 520, which are offset from one another are arranged. A great variety is related by means of the layout according to FIG. 6 possible on pretreated or not pretreated hot strip. The first unit 519 for pretreating hot strip, such as pickling, enables separate treatment of hot strip 521 with the combined treatment with a subsequent coating step (for example hot-dip galvanizing) in the second treatment unit 520 via a coupling unit 522. The second treatment unit 520 also includes a separate inlet and outlet part 502 E, 502A. A total of galvanized hot strip 523 is obtained as the end product.

In a preferred modification to the embodiment according to FIG. 6 shows 7 the difference that on the outlet part in the Pretreatment unit 619 is dispensed with. There is a system layout with two inlet parts 619E, 620E, each for hot strip 624, which is still the process part 619 PBV for stripping and the cold strip 625, which only the Treatment unit 620 passes. Overall, there is again the advantage that scaled hot strip is completely separate from the cold strip treatment can be introduced into the system and therefore no scale dust the cold strip treatment interferes, but can in this embodiment on Outlet part 619A can be dispensed with for economic reasons.

Fig. 8 shows schematically a twist roll, which is used to deflect the tape direction 90 ° is used. Two twist rollers arranged side by side enable one Redirection by 180 °. The twist roller 26 is at a 45 ° angle to the direction of tape travel arranged. The metal strip 27 is on a helical path around the Twistrolle 26 guided and deflected by 90 °.

In addition to the twist roller 26, two S-roller stands 28, 29, a control roller unit 30 and a calming roller unit 31 are required. With the help of S-roll stands 28, 29 a constant tensile force is set. The control roller unit 30 serves to influence the tape running direction. The calming rollers 31 are intended to dampen vertical movement of the belt.

According to the invention, various twist rollers and coupling units are used Treatment centers flexible, i.e. optional, connected to each other, where the tape flow and thus the successive treatment steps can be determined by the tape through a coupling unit is led or not.

Claims (19)

System for treating a metal strip or sheet (4) with at least two treatment units (1, 2, 3),
characterized in that the treatment units (1, 2, 3) are flexibly connected to one another via coupling units (11, 12) for a continuous metal strip flow through a selected group of treatment units and in that the individual treatment units (1, 2, 3) are arranged in such a way that that they can also be operated independently with a separate belt pass. System according to claim 1,
characterized in that the treatment units (1, 2, 3; 201, 202, 203) are arranged parallel to one another and, with coupling units (11, 12; 211, 212), the means for conveying the belt from one treatment unit to a parallel adjacent treatment unit have, are connected so that a meandering band flow arises within the system. System according to claim 1 or 2,
characterized in that each treatment unit (1, 2, 3) as an independent unit has an inlet part (1E, 2E, 3E), a process part (1PBV, 2PK, 3PAS) and an outlet part (1A, 2A, 3A) with a first transition (5, 7, 9) between the inlet section (1E, 2E, 3E) and the beginning of the process section (1Pa, 2Pa, 3Pa) and a second transition (6, 8, 10) between the end of the process section (1 Pe, 2Pe, 3Pe) and the outlet part (1A, 2A, 3A)
and that the respective coupling units (11, 12) are arranged on at least one of these transitions of each treatment unit. System according to claim 3,
characterized in that each treatment unit (1, 2, 3) has a basic belt conveying direction depending on the direction from the inlet (1E, 2E, 3E) to the outlet part (1A, 2A, 3A),
that the treatment units (1, 2, 3) are arranged parallel to each other so that the basic belt conveying directions of immediately adjacent units run in opposite directions
and that in each case the process part end (1Pe, 2Pe) of one unit and the process part start (2Pa, 3Pa) of an adjacent unit are connected via a common coupling unit (11, 12). System according to claim 3,
characterized in that each treatment unit (201, 202, 203) has a basic belt conveying direction depending on the direction from the inlet (201E, 202E, 204E) to the outlet part (201A, 202A, 203A),
that the treatment units (201, 202, 203) are arranged parallel to one another so that the basic belt conveying directions of immediately adjacent units run in the same direction
and that the process part start (201 Pa, 202Pa) of one unit and the process part start (202Pa, 203Pa) of an adjacent unit are connected via a common coupling unit (211, 212), with reversing means (215 , 216) are provided for the belt conveyor in order to convey the belt with the opposite direction of conveyance to the coupling unit (211, 212) and from there to the process part of the adjacent unit. System according to one of claims 1 to 5,
characterized in that the respective coupling units (11, 12; 211, 212) are each arranged between two immediately adjacent treatment units or between two spaced-apart treatment units. System according to one of claims 1 to 6,
characterized in that the treatment units (1, 2, 3) are at least one unit for preparing the strip surface of rolled strip and / or at least one unit for applying a protective layer to the strip surface and / or at least one unit for cold rolling. System according to one of claims 7,
marked by
three treatment units (1, 2, 3), the unit (2) for cold-rolling a hot-rolled pre-strip being arranged in parallel between the unit (1) for preparing the strip surface and the unit (3) for applying a protective layer on the strip surface. Installation according to one of claims 1 or 2,
characterized in that the treatment units (519, 520; 619, 620) are arranged parallel and offset from one another. System according to claim 9,
characterized in that the treatment units (519, 520; 619, 620) comprise at least one inlet part (519E, 520E; 619E, 620E) and one process part (519 PBV, 520 PAS; 619 PBV, 620PAS) and are arranged such that the Process part end (519 PBV e) of one treatment unit is arranged approximately at the same height as the process part start (520 PAS a) of the adjacent treatment unit (520). Installation according to claim 9 or 10,
marked by
two treatment units (619, 620) with a first unit for preparing the surface of a hot-rolled pre-strip (624), which has an inlet part (619E) and a process part (619 PBV), and
with a second unit for applying a protective layer on either the surface of the prepared hot-rolled pre-strip or the surface of cold-rolled strip (625), which comprises an inlet part (620E), a process part (620 PAS) and an outlet part (620A), and
a coupling unit (622) which is arranged between the process part end (619 PBV e) of the first unit (619) and the process part start (620 PAS a) of the second unit (620). Installation according to one of claims 1 to 11,
characterized in that the coupling units (11, 12; 211, 212) comprise at least one twist roller (26). System according to claim 12,
characterized in that a coupling unit with a twist roller (26) additionally has two S-roller stands (28, 29), a control roller unit (30) and a calming roller unit (31). Installation according to one of claims 1 to 13,
characterized in that the process part (PBV) of the unit (1; 201) for preparing the strip surface comprises means of mechanical and / or thermal and / or chemical or electrochemical nature for changing the surface geometry and / or for cleaning and / or for activating the metal surface. Installation according to one of claims 1 to 14,
characterized in that the process part (PAS) of the unit (3; 203) for applying a protective layer comprises means for applying metallic coatings by chemical means. System according to one of claims 1 to 15,
characterized in that the process part (PK) of the unit (2; 202) for cold rolling comprises a tandem mill. Method for treating a metal strip or sheet (4; 204) in a system according to one of claims 1 to 16 with at least two treatment units (1, 2, 3),
characterized in that the metal strip is guided flexibly from a treatment unit (1, 2, 3) to a selected adjacent treatment unit by means of coupling units (11, 12) arranged therebetween for a continuous metal strip flow through a selected group of units, the metal strip in each case also separately through the individual treatment units to carry out a separate treatment step. A method according to claim 17,
characterized in that the continuous strip flow meanders within the system. Method according to claim 18 or 19,
characterized in that the metal strip in the form of metal preliminary strip passes through a treatment sequence consisting of a selectable combination of treatment steps, which include:
Preparing the strip surface and / or applying a protective layer to the strip surface and / or cold rolling.

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