RU2664075C1 - Combined installation of etching and rolling of strip metal - Google Patents

Abstract

FIELD: technological processes.SUBSTANCE: invention relates to the field of combined etching and strip rolling. To reduce capital costs, the installation contains a line of continuous etching, storage devices (20, 20') for the accumulation of an etched strip with a capacity of 1,000–3,000 meters of strip, reversible rolling mill with at least two first stands (19) located downstream of accumulator (20), first drum (21) located downstream of the first two stands for winding the strip after an odd rolling step, for winding a roll weighing from 100 to 300 tons and a diameter of up to 6 meters, welding machine (2') installed between the pickling line and the first stands, at least one second drum (16) located upstream of the first stands and downstream of welding machine (2'), for winding at least one part of the strip after an even rolling step in the direction opposite to the direction of the odd stage, at that the second drum having a size allowing to wind the portions of the strip with a specific gravity of 15 to 21 kg/mm; first cutting device (22, 23) located between the second drum and first stands (19), that is configured to cut the rolled strip each time after winding a part of the strip with a specific gravity of 15 to 21 kg/mm on the second drum, at that welding machine (2') is configured to weld the front end of the rolled strip cut by the first cutting device to the front end of strip to be rolled.EFFECT: device provides an economical production of high quality products.15 cl, 9 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a combined installation for etching and rolling strip metal.

State of the art

The first completely continuous rolling mills in the field of cold rolling appeared in the 70s and 80s of the last century, after which the first combined installations for etching and rolling were created.

Continuous rolling of metal strips by rolling welded joints has significant advantages associated with the productivity of the installation, namely the increase in hourly productivity or kilometers by 20-100%; with surface quality by reducing the risk of defects at the stage of loading the front ends or unloading the rear ends of the rolled material; and also with efficiency in the form of reducing the number of rejected front and rear ends of the material due to the fact that their thickness does not meet the requirements.

Such a solution involves the use of plants in which a continuous pickling line is directly connected to a cold rolling tandem mill with four or five stands, which requires higher investment and production capacity, usually exceeding one million tons per year.

The disadvantage of this solution is that each time, based on the length of the rolled product, the production is limited by the bottleneck of the installation, which, depending on the size and weight of the roll, can be the loading place in the installation, the etching process, drives and the rolling mill in relation to the maximum speed which can be provided by the rolling tandem mill, taking into account the speed achieved in each stand and the installed capacity.

The development of new materials, in particular high-strength steel, taking into account the need to obtain materials of much smaller thickness, has led to the creation of new continuous rolling mills combined with an etching line. For example, the curved design of the two plants was made in such a way that the reel of the pickling line is located close to the winder of the rolling mill. Thereby, crimping can be performed, and the rolled coil can be loaded into the pickling line so as to achieve the maximum number of crimps in the rolling mill. This design has the disadvantage associated with a significant decrease in productivity, since for the manufacture of a roll of material of the required thickness, several passes are necessary.

An alternative used by some manufacturers is the so-called "heavy rolls", the weight of which in some cases exceeds 60 tons, and the diameter is almost 3 meters. This system, used on tandem continuous rolling mills, asymptotically allows to achieve a productivity almost equal to that achieved on a continuous mill, increases their efficiency and partially improves surface quality. The advantage of this solution is to reduce the investment in the rolling installation, but this significantly increases the cost of structures for moving rolls, for example, roads and corresponding bridge cranes, which must be sized before and after the rolling installation to continuously withstand such increased loads.

An alternative to a tandem cold rolling mill is a reversible rolling mill, usually designed for small production capacities, in particular:

- for single-strand reversible rolling mills: from 100,000 to 400,000 tons per year;

- for double-stand reversing rolling mills: from 200,000 to 1,000,000 tons per year.

By their nature, rolling on reversible rolling mills means a lower level of material processing efficiency compared to multi-stand tandem rolling mills, since the front and rear ends of the material are not rolled or are partially rolled. In addition, reversible rolling mills exclude the possibility of controlling the quality of the surface treatment of the paged strip, as is implemented in tandem rolling mills. This is because it is not recommended to replace the mill stand before the last pass in order to ensure a clean surface treatment of the strip, and using another emulsion system to reduce surface contamination is very difficult and costly.

To increase the efficiency of reversible rolling mills, various methods and innovations are used, for example:

- development of equipment and appropriate automation for loading the front ends and unloading the rear ends with closed stands;

- the creation of spot welding machines used to weld the front end of the roll to the leading strip, that is, to the portion of the strip not subject to rolling, in order to ensure the fastest loading and grip of the processed material by the cage.

These methods showed only partial results, since their application obviously makes the working conditions of the rolling mill more stringent and creates risks of damage to the rolling rolls.

An example of a combined installation of pickling and rolling strip metal on reversible rolling mills is described in document US 2012/0272703 A1.

Thus, there is a need to create a combined etching and rolling installation, as well as an appropriate method that will eliminate the above disadvantages.

Disclosure of invention

The main objective of the present invention is to provide a combined etching and reversible cold rolling installation, which will achieve a level of quality, productivity and processing efficiency of the material, comparable to the corresponding indicators of a four or five-stand tandem rolling mill, connected to a continuous etching installation, but at a lower capital cost .

Another objective of the invention is the creation of an installation that allows you to get rolls of strip material with a specific gravity of from 15 to 21 kg / mm, which are compatible with standard designs for moving rolls.

Another objective of the invention is to provide an installation in which a reverse rolling method is used in order to provide quality control of surface treatment, which is necessary for sheets intended for use in the automotive industry and the manufacture of household appliances.

The present invention provides a solution to achieve the above objectives by creating a combined installation of etching and cold rolling of strip metal, which contains:

- etching line for continuous etching of the strip;

- drive for the accumulation of the etched strip located downstream relative to the etching line;

- reversible cold rolling mill having at least two first rolling stands located downstream of the accumulator;

- a first drum located downstream relative to the first two rolling stands and designed to wind the strip after the first rolling step;

- at least one second drum located upstream relative to the first two rolling stands and intended for winding at least one part of the strip after the second rolling step in a direction opposite to the first step, wherein said second drum has a size allowing it to be wound parts of the strips up to a predetermined maximum weight or limit diameter of the roll;

- the first cutting device located between the specified second drum and the two first rolling stands and designed to cut the rolled strip each time after part of the strip wound on the second drum reaches a predetermined limit weight or roll diameter;

moreover, the specified drive accommodates 500-3000 meters of strip;

the first drum has a size that allows winding a roll weighing from 100 to 300 tons and / or a diameter of up to 6 meters;

- a welding machine is located between the drive and the first two rolling stands;

wherein the second drum is located downstream relative to the welding machine;

and said welding apparatus is configured to weld the front end of the rolled strip at the exit after the second rolling step obtained after cutting with the first cutting device, with the front end of the strip exiting the drive.

In addition, a method for etching and cold rolling of strip metal is claimed, performed by the above installation, which provides for the following steps:

a) continuously etching the strip using an etching line;

b) accumulate the strip, subjected to continuous etching, using a drive with a capacity of 500-3000 meters of the strip;

c) performing the first step of rolling a predetermined amount of strip in at least two first rolling stands and then winding a roll of weight from 100 to 300 tons and / or a diameter of up to 6 meters onto the first drum;

d) a second rolling step of said predetermined number of strips is performed in the direction opposite to the first rolling step in said two first rolling stands to obtain a rolled strip, and the first part of the rolled strip is wound at least one second drum until a predetermined weight limit is reached or the maximum diameter of the roll, that is, get the first rolled coil;

e) cutting the rolled strip after forming the first rolled coil with the first cutting device;

f) wrap the subsequent parts of the rolled strip onto the second drum until a predetermined maximum weight or limit diameter of the roll is obtained, form the subsequent rolled rolls, cut the rolled strips with the first cutting device after forming each subsequent rolled roll;

g) weld with a welding machine the front end of the rolled strip at the exit from the second rolling step, obtained after the last cutting with the first cutting device, with the front end of the strip exiting the storage device;

h) repeat steps b) to g) while continuing step a).

The invention provides for the continuous rolling of a “megarulon” at the first, or odd, rolling step, thus obtaining two or three reductions in thickness.

A megarulon is a roll of a strip obtained, for example, by welding 4-15 small strips with each other, weighing from 100 to 300 tons and with a diameter of 4 to 6 m.

In a first embodiment of the invention, in which the strip wound on the first winding drum located downstream of the rolling mill reaches a predetermined maximum weight or maximum diameter, the strip loaded into the rolling mill is cut, thereby separating the rolling mill and the line etching. Preferably, the megarulon described above is wound on the first drum after the first rolling step.

The etching line continues to process the strip that accumulates in the output drive of increased capacity (500-3000 m strip, preferably at least 2000 m, which equals approximately 2-3 regular rolls, the size or weight of which corresponds to approximately 1/4 of the size or megarulon weights). In a first embodiment of the invention, the increased capacity drive comprises a horizontal drive having at least one movable carriage at one end containing at least three non-drive rollers and non-drive rollers fixed at the opposite end so as to form an etched continuous strip loop. When moving the movable carriage may increase the amount of accumulated strip. The etched strip is supported by the corresponding support rollers, and its direction is due to the guide rollers located at the opposite end from the movable carriage.

In this case, by changing the direction of rolling in the opposite direction, the rolling mill performs a second pass, providing two or three reductions in thickness. When the strip wound on the second winding drum, located upstream relative to the rolling mill, reaches a predetermined limit weight or limit diameter, the strip is cut and the first roll is unloaded. This process continues, and thus, for example, four or five rolls with a specific gravity of 15 to 21 kg / mm (kg per mm of strip width) are obtained. The dimensions and / or weight of the finished rolls on the second drum are automatically controlled by setting the maximum weight and diameter. Upon reaching the first of two limit values for the roll on the second drum, the strip is cut using the first cutting device.

At the end of this operation to create a finished roll, the method starts again, while the front end of the strip is pre-cut, and a new, or odd, rolling phase is started.

The condition for continuous rolling is created at the first (odd) stage by installing the welding machine at the inlet of the rolling mill and leaving the rear end after the previous rolling for welding with the above front end.

Continuous rolling is also provided in the second (even) stage by installing a double winding drum or a drum carousel upstream of the rolling mill together with flying shears.

At the end of the second stage, the pickling line and the reversing rolling mill are again connected, and continuous rolling is resumed starting from the first stage.

Another advantage of the present invention is that by installing a drive of increased capacity between the pickling line and the rolling mill, and by separating the two plants before performing the second rolling pass, certain bottlenecks that limit the performance of a conventional combined installation are eliminated, thereby achieving improved performance .

In the second embodiment of the invention, a high-capacity storage ring is installed between the pickling line and the reversing rolling mill, which contains at least one third drum for winding a roll weighing from 100 to 300 tons and a diameter of up to 6 meters (megarulon). Preferably, two third drums are mounted on a turntable rotatable 180 ° about a vertical axis after a predetermined time for winding the megarulon on one of the two third drums, thereby alternately the first third drum is used as a winding drum to wind the strip exiting from the pickling line, and the second third drum is used as an unwinding drum to unwind the strip loaded into the rolling mill. In this embodiment of the invention, the welding machine located between the pickling line and the first rolling stands serves only for preliminary welding and directly welding, but not for cutting the strip in order to disconnect the rolling mill from the pickling line. Separation in this case is achieved using a second cutting device located upstream of the turntable, and using the turntable itself.

Brief Description of the Drawings

Additional distinguishing features and advantages of the invention are set forth in the detailed description of a preferred, but not exclusive, embodiment of a combined etching and rolling apparatus described as a non-limiting example, with reference to the accompanying drawings, in which:

in FIG. 1 is a schematic representation of a first embodiment of a plant in accordance with the invention;

in FIG. 2 shows an example of a rolling sequence for a first (odd) step;

in FIG. 3 shows an example of a rolling sequence for a second (even) step using stationary shears;

in FIG. 4 shows an example of a rolling sequence for a second (even) step using flying shears;

in FIG. 5 shows an embodiment of a rolling mill of an installation in accordance with the invention;

in FIG. 6 a to 6 d show examples of the use of a welding machine installed upstream of a rolling mill;

in FIG. 7 is a schematic representation of a second embodiment of a plant in accordance with the invention;

in FIG. 8 is a schematic representation of a dual system for winding and unwinding strips for unloading from an pickling line and loading into a rolling mill;

in FIG. 9 shows the operating sequence of the aforementioned double winding and unwinding system.

The implementation of the invention

Figures 1 through 9 show preferred embodiments of a combined installation for continuous etching and reverse cold rolling.

Installation in accordance with the invention, in all embodiments, contains:

- etching line for continuous etching of the strip;

- storage devices 20, 20 'of increased capacity for the accumulation of the etched strip, the capacity of which is 500-3000 meters of the strip and which are located downstream relative to the etching line;

- reversible cold rolling mill containing at least two first rolling stands 19 located downstream relative to the storage devices 20, 20 ';

- drum 21, located downstream relative to the first rolling stands 19, for winding the strip after the first, or odd, stage of rolling, and preferably having a size that allows you to get a roll weighing from 100 to 300 tons and a diameter of up to 6 meters;

- a welding machine 2 ', located between the storage devices 20, 20' and the first rolling stands 19;

at least one drum 16, located upstream relative to the first rolling stands 19 and downstream relative to the welding apparatus 2 ', for winding at least one part of the strip after the second, or even, rolling step, in the opposite direction to the first step, however, at least one drum 16 preferably has a size that allows you to wrap parts of the strip to achieve a predetermined maximum weight or limit diameter of the roll, for example, specific gravity from 15 to 21 kg / mm or a diameter of about 2000-210 0 mm;

- the first cutting device, for example, scissors 22, 23, located between the specified one second drum 16 and the first rolling stands 19 and designed to cut the rolled strip each time after part of the strip wound on the drum 16 reaches a predetermined limit weight or limit diameter of a roll.

Preferably, the welding machine 2 ′ is configured to weld the front end of the rolled strip at the exit of the second rolling step obtained after cutting with the first cutting device, with the front end of the strip exiting the storage devices 20, 20 ′.

The drum 21 has a high capacity and is made of a pipe of increased thickness or a metal round rod that can withstand large rolls weighing up to 300 tons or a diameter of up to 6 meters. The size of such a drum 21 also provides a tension of 350 to 500 kN, preferably 400 kN, during rolling, which contributes to an increased reduction in thickness on the rolling mill.

According to a first embodiment of the invention, the welding machine 2 ′ is capable of cutting a strip exiting from the accumulator 20 after a predetermined number of strips have passed the first rolling step, thereby disconnecting the rolling mill and the pickling line. As shown in FIG. 1 and FIG. 6d, the etching line contains sequentially:

- a loading section consisting of at least two unwinding drums 1 and a welding machine 2, preferably a laser welding machine, which can perform malleable joints of strips unwound from the drums 1, thereby creating a continuous strip;

- drive 3 at the entrance to accumulate a continuous strip and ensure the continuity of the etching process;

- descaling machine 4, in which, by the combined action of tension and alternating bending around the rollers of the corresponding diameter, the destruction of the oxide film covering the continuous strip is achieved, which accelerates subsequent etching;

- etching baths 5 in an amount, for example, from two to four, depending on the required performance, in which etching of a continuous strip occurs; these pickling baths 5 are equipped with auxiliary systems for recycling and heating the pickling acid solution.

Along the entire etching line, strip direction systems, tension control systems, and various auxiliary systems are installed.

Additionally, downstream of the etching baths 5 can be installed:

- an intermediate accumulator 6 for accumulating the etched continuous strip exiting the etching baths 5, after washing and drying;

- trimming machine 7 for trimming the edges of the pickled continuous strip, while the intermediate drive 6 avoids stopping the etching process in case of stopping the trimming machine 7 to change the strip width or replace the blades.

Preferably, the installation according to the first embodiment of the invention comprises, directly downstream of the pickling baths 5 or the trimming machine 7, a storage tank 20 of increased capacity as a storage stack at the exit of the pickling line, the size of which allows receiving from 500 to 3,000 meters of pickled continuous strip, preferably in at least 2000 meters.

The specified drive 20 increased capacity is a horizontal drive containing from one end of at least one movable carriage containing at least three non-drive rollers, and from the opposite end of the fixed non-drive rollers so as to create a loop etched continuous strip. When moving the movable carriage may increase the amount of accumulated strip. Downstream relative to the drive 20 increased capacity are located in series:

- equipment 9 for monitoring the tension and centering of the etched continuous strip, the size of which provides tension from 250 to 500 kN, preferably 400 kN;

- a welding machine 2 ', preferably a laser welding machine;

- the specified at least one drum 16, preferably made with the possibility of winding parts of the strip with a specific gravity of from 15 to 21 kg / mm or rolls with a diameter of up to 2000-2100 mm;

- scissors 22, 23;

- at least two reversible first rolling stands 19, four- or six-roll;

- drum 21, preferably made with the possibility of winding a roll weighing from 100 to 300 tons and a diameter of up to 6 meters.

In a preferred embodiment of the invention, only two first rolling stands 19 are provided. Thus, in the two stages of rolling, a total of four thickness reductions are performed.

Along the entire line of the rolling mill, auxiliary systems for cooling and lubricating the strip are installed, as well as auxiliary systems for monitoring the rolling process.

The operating procedure of the first embodiment of the invention (FIGS. 1 to 6d) is described below.

The unwinding drums 1 at the inlet portion unwind the corresponding strips welded to each other using the welding machine 2, thereby forming a continuous strip. To ensure the continuity of the etching process, a continuous strip is accumulated in the drive 3 at the inlet. The oxide-coated continuous strip exiting the accumulator 3 passes through a descaling machine 4, in which, by the combined action of tension and alternating bending by means of rollers of the corresponding diameter, the oxide film is destroyed, which accelerates subsequent etching in the pickling baths 5. Then, the continuous strip passes through the pickling bath 5, after which it is washed and dried.

The etched continuous strip enters the intermediate storage 6 and then passes through the trimming machine 7, if such devices are included in the installation.

After that, the etched continuous strip enters the drive 20 of increased capacity, in which it accumulates in the form of loops using non-drive rollers, for example, such a drive, which is schematically shown in FIG. one.

Then, the etched continuous strip passes through the tension and centering equipment 9, forming a loading system into the rolling mill, and through the welding machine 2 '.

If there is a driving strip 40 with a length of approximately 30 meters on the winding drum 21, then preferably between the driving strip 40 and the front end 41 (Fig. 6a) of the etched continuous strip, a connection 26 is made using a welding machine 2 ', which makes it possible to load this connection 26 into two-stand reversible rolling mill 19, while the strip is tensioned by the winding drum 21 (see Figs. 6a to 6d). The front end 41 of the strip is prepared for welding by precision cutting using a welding machine 2 '. Before welding, the end of the driving strip 40 is also prepared by precision cutting using a welding machine 2 '.

During the first (odd) rolling step, the first rolling stands 19 continuously roll, for example, at least four strips butt welded to each other related to the above continuous strip (with four welded joints, including also connecting to the driving strip), to receiving on the drum 21 the so-called megarulon, that is, a roll weighing from 100 to 300 tons and a diameter of up to 6 meters. At this stage, the welding machine 2 'cuts the connection between the fourth and fifth strips related to the above continuous strip. When the maximum weight (300 tons) or the maximum roll diameter (6 meters) is reached, special sensors send a control signal to the 2 'welding machine, which performs the cutting.

The number of welded initial strips required to obtain a megarulon may vary depending on the length of the initial strips.

During the first stage of rolling, the drive 20 of increased capacity, which at the beginning of rolling was filled almost as much as possible, is released due to the different speeds of the rolling mill and the etching line.

The rear end of the etched continuous strip cut off by the welding machine 2 'is fed to the winding drum 16 (Fig. 3a) to start the reverse second (even) step of rolling the strip wound on the drum 21.

After the first rolled coil with a specific gravity of 15 to 21 kg / mm or a diameter of 2000-2100 mm is wound on the drum 16, the rolling mill is stopped, special sensors send a control signal to the stationary scissors 22, which cut off the strip wound on the drum 16 , and the first rolled coil is unloaded from the drum 16. The front end of the strip obtained by cutting with stationary scissors, when leaving the first stands 19, enters the drum 16, and the second rolling step is performed to obtain a second rolled coil with specific ECOM of 15 to 21 kg / mm or a diameter of 2000-2100 mm. The rolling mill is stopped again, stationary shears 22 cut off the strip wound on the drum 16, and the second rolled coil is unloaded from the drum 16. These operations are repeated until the second rolling step of the last rolled coil, for example, the fourth roll, until the leading strip, fixed on the drum 21, approached the loading point in the first rolling stands 19. The rolling is stopped, the first stands 19 are opened, the stationary shears 22 cut the strip again, and the last rolled coil with a specific gravity of 15 to 21 kg / mm or with a diameter of 2000-2100 mm is unloaded from the drum 16, while the front end of the driving strip reaches the welding machine 2 ', which performs a weldable rolling connection with the front end of the pickled continuous strip previously cut off by the welding machine 2'. Upon completion of welding, the cycle starts anew from the first (odd) rolling step and the formation of a new megarulon on drum 21. By installing a welding machine 2 'at the inlet of the rolling mill and leaving the rear end after the previous rolling to weld it with the front end of the pickled continuous strip previously cut welding machine 2 ', creates a condition for continuous rolling at an odd first rolling stage.

During the rolling step, an etched continuous strip exiting the pickling line enters the high-capacity filler 20. Preferably, the etch line speed is controlled so that the filling time of the accumulator 20 is substantially equal to the runtime of the rolling mill to form the above rolled coils on the drum 16.

In order to create a condition for continuous rolling, also in the second, or even, rolling step, according to an embodiment of the invention, the use of flying shears 23 instead of stationary shears 23 and a double drum or carousel 24 of the drums 16 instead of a single drum 16 is provided (see Fig. 4). Flying scissors 23 are made with the possibility of cutting the rolled strip at a speed of 50 to 500 m / min. The carousel 24 usually contains two drums 16 located diametrically opposite to each other and pivotally connected to the turntable onto which the rolled strip is alternately wound: when the finished roll is wound on one of the drums, the previously wound finished roll is unloaded from the other drum.

According to a second embodiment of the invention shown in FIG. from 7 to 9, the increased capacity drive 20 ′ comprises at least one additional increased capacity drum 28 for winding a roll weighing from 100 to 300 tons and a diameter of up to 6 meters (megarulon). It is preferable to install two additional drums 28, 28 'of increased capacity at the ends or opposite sides of the turntable 27 (Fig. 8), configured to rotate 180 ° around the vertical axis after a predetermined time for winding the megaroulon onto one of the two drums 28, 28 ', whereby the indicated drums are alternately used: the first drum 28 is used as a drum for winding an etched continuous strip exiting the etching line, and the second drum 28' is used as e reel for unwinding the continuous strip etched loaded in the rolling mill. A second cutting device is provided, for example, additional scissors (not shown in the figures) mounted upstream of the turntable 27 and configured to cut the etched strip after winding the megaroulon onto one of the two drums 28, 28 '. In this case, special sensors also send a control signal to the second cutting device when the maximum weight (300 tons) or the maximum diameter of the roll (6 meters) is reached. After cutting, the turntable 27 is rotated 180 °.

Loop 8 (Fig. 7) of the etched continuous strip can be formed upstream of the specified second cutting device using non-driven rollers 8 'in order to accumulate the strip that has been processed in the etching line, each time the winding drum 28 of increased capacity stops. The same components of the installation shown in FIG. 1, namely, all components indicated by reference numerals 1, 2, 3, 4, 5, 6, and 7 are provided upstream of said loop 8 of the strip.

The turntable 27, which is a dual strip winding / unwinding system, can be powered by, for example, a rack system. The rotation of the platform is controlled by an electric or hydraulic motor 32, which makes it possible to achieve a rotation angle of 180 °. On the opposite sides of the turntable 27 there is a corresponding drum 28, 28 'of increased capacity, made with the possibility of winding / unwinding megarulons weighing from 100 to 3000 tons and a diameter of about 6 meters.

The rotation controls 31, 30 and 31 ', 30' of the respective drums 28, 28 'are independent of each other, which provides independent control of winding the strip exiting the etching line and unwinding the etched strip entering the first rolling stands 19 of the cold rolling mill .

During 180 ° rotation of the turntable 27, the rotation controls 31, 30 and 31 ', 30' are disconnected from the respective drums 28, 28 'by means of the corresponding movable joint 29, 29', which is retracted.

When winding and unwinding the strip from the reels 28, 28 ', the alignment and centering of the strip is ensured by the axial movement of the corresponding spindle 34, 34' controlled by the corresponding hydraulic cylinder 33, 33 '.

Downstream of the drums 28, 28 ', and therefore of the turntable 27, the following equipment is installed in series (see FIG. 7):

- a welding machine 2 ', preferably a laser welding machine;

- at least one drum 16, preferably made with the possibility of winding parts of the strip with a specific gravity of from 15 to 21 kg / mm or rolls with a diameter of up to 2000-2100 mm;

- scissors 22;

- at least two reversible first rolling stands 19, four- or six-roll;

- drum 21 increased capacity, preferably made with the possibility of winding a roll weighing from 100 to 300 tons and a diameter of up to 6 meters.

In a preferred embodiment of the invention, only the first two rolling stands 19 are provided. Thus, in the two stages of rolling, only four reductions in thickness are performed.

Along the line of the entire rolling mill, auxiliary systems for cooling and lubricating the strip are installed, as well as auxiliary systems for monitoring the rolling process.

The operating procedure of this second embodiment of the invention (see FIGS. 7 through 9) is described below.

The unwinding drums 1 at the inlet portion uncoil the corresponding strips welded to each other using the welding machine 2, resulting in a continuous strip. To ensure the continuity of the etching process, a continuous strip can be accumulated in the drive 3 at the inlet. The oxide-coated continuous strip exiting the accumulator 3 passes through a descaling tool 4, in which, by the combined action of tension and alternating bending by means of rollers of the corresponding diameter, destruction of the oxide film covering the continuous strip is achieved, which accelerates subsequent etching in pickling baths 5. Then, continuous the strip passes through etching baths 5, after which it is washed and dried.

The etched continuous strip enters the intermediate storage 6 and then passes through the trimming machine 7, if such devices are included in the installation.

After that, the etched continuous strip enters the drive 20 'increased capacity by winding, for example, on the drum 28' increased capacity of the turntable 27 (Fig. 8).

In FIG. 9 schematically shows the operating sequence with the speed of the turntable 27. In the first step (Fig. 9a), the first drum 28 starts winding the megarulon of the etched strip, while the second roll 28 'starts unwinding the other previously wound megarulon in the direction of the first rolling stands 19, Thus, the first rolling phase begins.

In the second stage (Fig. 9b), while the reversing rolling mill performs the second rolling step and the second drum 28 ′ remains empty, the first drum 28 completes the winding of the megarulon of the etched strip, the winding process is stopped, the etched strip is cut upstream of the turntable 27 using the second cutting device, and the turntable 27 begins to rotate in order to bring the first drum 28 into a position for unwinding the pickled strip in the direction of the first rolling stands 19.

In the third stage (Fig. 9c), the first drum 28 is in the unwinding position, and the strip is unwound from the first drum 28 and moved to the loading or welding position close to the welding machine 2 ', while the second drum 28' starts winding a new megarulone etched strip.

The front end of the strip, unwound from a new megarulon located on the drum 28 or drum 28 ', is prepared by performing precision cutting using a welding machine 2' in order to ensure its readiness for subsequent welding.

Provided that approximately 30 meters of the driving strip remains on the winding drum 21, it is preferable that a connection be made between the driving strip and the front end of the etched strip exiting the first drum 28 using the welding machine 2 ', thereby making it possible to load this connection through a reversible rolling mill with two first stands 19 so that the strip can be wound on the winding drum 21 at the exit.

Before welding, the end of the driving strip is also prepared by precision cutting using a welding machine 2 '.

During the first (odd) rolling step, the first stands 19 continuously roll the strip unwound from the first drum 28 until the so-called megarulon is again wound onto the drum 21 of increased capacity.

During this first rolling step, the megarulon is completely unwound from the unwinding reel 28 of increased capacity, and at the same time, another drum 28 ', which is in the position of winding the etched strip, winds up a new megarulon.

The rear end of the etched continuous strip, which has been rolled and was again wound on the drum 21, is fed to the winding drum 16, and thus the second reversible (even) rolling step begins (see FIG. 7).

After the first rolled coil with a specific gravity of 15 to 21 kg / mm or a diameter of 2000-2100 mm is wound on the drum 16, the rolling mill is stopped, special sensors send a control signal to the stationary scissors 22, which cut off the strip wound on the drum 16 , and the first rolled roll is unloaded from the drum 16. The resulting front end of the strip, upon exiting the first rolling stands 19, enters the drum 16, and the second rolling step is resumed to obtain a second rolled roll on the drum 16 with a specific gravity of 15 to 21 kg / mm or dia rum 2000-2100 mm. The rolling mill stops again, the stationary scissors 22 cut off the strip wound on the drum 16, and the second rolled coil is unloaded from the drum 16. These operations are repeated until the second rolling step of the last rolled coil, for example, the fourth roll, until the leading strip is practically ready for loading into the first rolling stands 19. Rolling is stopped, the first rolling stands 19 are opened, the stationary shears 22 cut the strip again, and the last rolled coil with a specific gravity of 15 to 21 kg / mm or ametrom 2000-2100 mm is discharged from the drum 16.

Moreover, as soon as the winding of the megaroulon on the high-capacity winding drum 28 'is completed, the winding is stopped, the etched strip is cut upstream of the turntable 27 using a second cutting device, and the turntable 27 rotates 180 °, moving the drum 28' to the position for unwinding in the direction of the reversing rolling mill and the drum 28 in the position for winding the strip exiting the etching line.

The front end of the strip, unwound from a new megaroulon located on the drum 28 ', is fed in a known manner to the welding machine 2', and it is prepared by precision cutting with a welding machine 2 'in order to ensure its readiness for subsequent welding. Before welding, the end of the driving strip is also prepared by precision cutting using a welding machine 2 '.

Upon completion of the welding of the leading strip with the front end of the strip of the new megarulon, the cycle starts anew from the first (odd) rolling step and the subsequent formation of the megarulon on the drum 21. By installing the welding machine 2 'at the entrance of the rolling mill and leaving the rear end of the strip after the previous rolling for it welding with the front end of the subsequent pickled continuous strip creates a condition for continuous rolling at the first, or odd, rolling phase.

To obtain a condition of continuous rolling, also in the second or even rolling step, according to an embodiment of the invention, the use of flying shears 23 instead of stationary shears 22 and a double drum or carousel 24 of drums instead of a single drum 16 is provided (as shown in Fig. 4 ) Flying scissors 23 are made with the possibility of cutting the rolled strip at a speed of from 50 to 500 m / min. The carousel 24 usually contains two drums 16 located diametrically opposite to each other and pivotally connected to the turntable, onto which the rolled strip is alternately wound: when the finished roll is wound on one of the drums, the previously wound finished roll is unloaded from the other drum.

In both embodiments of the invention described above, an additional rolling stand 25 may be used, installed upstream of the at least two first rolling stands 19 and configured to open at an odd rolling step and close at an even rolling step. Thus, in two stages of rolling, a total of five thickness reductions are performed. Preferably, the additional rolling stand 25 comprises work rolls whose surface cleanliness is higher than the surface cleanliness of the work rolls of the first two rolling stands 19. This embodiment of the invention allows a rolled surface to be obtained with a controlled finish during the last rolling step. Preferably, in the second and last stages of rolling, cooling of the rolling stand 25 is provided using a specialized system for better surface cleaning.

Claims (34)

1. Installation for combined etching and rolling of strip metal, which contains - etching line for continuous etching of strip metal, - storage devices (20, 20 ') for accumulating the etched metal strip located downstream of the etching line, - reversible cold rolling mill having at least two first rolling stands (19) located downstream of the accumulator (20, 20 '), - the first drum (21), located downstream relative to the first two rolling stands (19) and designed to wind the strip after the first rolling stage, at least one second drum (16) located upstream relative to the first two rolling stands (19) and designed to wind at least one part of the strip after the second rolling step in a direction opposite to the first stage, said second drum (16 ) has a size that allows you to wind part of the strip on it to a predetermined maximum weight or maximum diameter of the roll, - a first cutting device located between said second drum (16) and two first rolling stands (19) and designed to cut the rolled strip each time after a part of the strip wound on at least one second drum (16) reaches in advance predetermined maximum weight or maximum diameter of the roll, characterized in that storage devices (20, 20 ') for the accumulation of the etched strip made with the possibility of placing a strip with a length of 500-3000 meters, the size of the first drum (21) provides the possibility of winding a roll weighing from 100 to 300 tons and / or a diameter of up to 6 meters, and between the storage devices (20, 20 ') and at least two first rolling stands (19) is a welding machine (2'), the specified second drum (16) is located downstream relative to the welding machine (2), while the welding machine (2 ') is configured to weld the front end of the rolled strip at the exit of the second rolling step obtained after cutting with the first cutting device, with the front end of the strip exiting the storage devices (20, 20 '). 2. Installation according to claim 1, in which the welding machine (2 ') is made with the possibility of cutting off the strip leaving the drive (20) after the predetermined number of strip has passed the first rolling step, and disconnecting the rolling mill and the etching line. 3. Installation according to claim 1, in which the drive (20 ') contains at least one third drum (28) for winding a roll weighing from 100 to 300 tons and / or a diameter of up to 6 meters. 4. Installation according to claim 3, in which two third drums (28, 28 ') are installed, attached to opposite ends of the turntable (27), configured to rotate around a vertical axis for alternately using the first third drum (28) as a drum for winding a strip extending from the pickling line and a second third drum (28 ') as a drum for unwinding a strip loaded into the rolling mill. 5. Installation according to claim 4, which has a second cutting device mounted upstream relative to the turntable (27), made with the possibility of cutting the etched strip after completion of winding a roll weighing from 100 to 300 tons and / or with a diameter of up to 6 meters per from two third drums (28, 28 '). 6. Installation according to any one of paragraphs. 1-5, which has at least one additional rolling stand (25), installed upstream relative to the first two rolling stands (19) and made with the possibility of opening at the first stage of rolling and closing at the second stage of rolling, and this additional rolling stand (25) equipped with work rolls whose surface cleanliness is higher than the surface cleanliness of the work rolls of the first two rolling stands (19). 7. Installation according to any one of paragraphs. 1-5, which has a driving strip (40), mounted on the first drum (21), and the welding machine (2 ') is configured to weld before the first step of rolling the driving strip (40) with the front end (41) of the first strip exiting from storage devices (20, 20 '). 8. Installation according to one of paragraphs. 1-5, in which the first cutting device is made in the form of stationary scissors (22) or flying scissors (23). 9. Installation according to claim 8, which, when using flying shears, has a double second drum (16) or a carousel (24) of the second drums (16) to perform an even stage of continuous rolling. 10. The method of combined etching and rolling of strip metal using the installation according to claim 1, which includes the following steps: a) continuous etching of the strip using the etching line, b) the accumulation of the etched strip using storage devices (20, 20 ') with a capacity of 500-3000 meters of strip, c) the first stage of rolling a predetermined number of strips in at least two first rolling stands (19) and the subsequent winding on a first drum (21) of a roll weighing from 100 to 300 tons and / or a diameter of up to 6 meters, d) a second rolling step of said predetermined amount of strip in a direction opposite to the first rolling step in said two first rolling stands (19) to obtain a rolled strip, and winding the first part of the rolled strip to at least one second drum (16) until a predetermined maximum weight or limit diameter of the roll, with the formation of the first roll of the rolled strip, e) cutting the rolled strip after forming the first roll using the first cutting device, f) winding the subsequent parts of the rolled strip onto the second drum (16) until a predetermined maximum weight or maximum diameter of the roll is obtained, with the formation of subsequent rolls of rolled strip, cutting the rolled strip with the first cutting device after each subsequent roll is formed, g) welding with a welding machine (2 ') the front end of the rolled strip at the exit of the second rolling step obtained after the last cutting with the first cutting device, with the front end of the strip exiting the storage device (20, 20') and h) repeating steps b) to g) while continuing with step a). 11. The method according to p. 10, in which between step c) and step d), the etched strip is cut using a welding machine (2 ') to disconnect the rolling mill and the etching line. 12. The method according to p. 11, in which the speed of the etching line is controlled to ensure that the filling time of the accumulator (20) is equal to the cycle time of the rolling mill necessary to form the rolled strip rolls on at least one second drum (16). 13. The method according to p. 10, in which after completing the winding of a roll weighing from 100 to 300 tons and / or a diameter of up to 6 meters on one of the drives (20 '), containing two third drums (28, 28') mounted on opposite the ends of the turntable (27), cut the strip upstream of the turntable (27). 14. The method according to p. 13, in which, after the first roll weighing from 100 to 300 tons and / or a diameter of up to 6 meters is wound on one drum (28 ') of two third drums (28, 28'), a rotary platform (27) rotate 180 °, as a result of which another drum (28) from two third drums (28, 28 ') is used to wind the strip with the formation of a second roll weighing from 100 to 300 tons and / or up to 6 meters in diameter, while how the drum (28 ') is used to unwind the first roll fed into the rolling mill, with the repetition of this cycle the required number of times. 15. The method according to one of paragraphs. 10-14, in which a driving strip (40) is used, fixed on the first drum (21) to create a welded joint between the driving strip (4) and the first front end (41) before the first rolling step c) using a welding machine (2 ') ) of the etched strip entering the rolling mill, wherein before step g), when said driving strip (40) approaches the loading point of the rolling mill, at least two rolling stands (19) are opened and the end of the rolled strip obtained in the last cutting with the first cutting device, with approaching the welding machine (2 ').

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