Method of replacing roll at steel strip continuous casting mill

FIELD: process engineering.

SUBSTANCE: invention relates to replacement of rolling mill stand (C) rolls. Said mill comprises, at least, one roll for continuous steel strip. Note here that said rolling mill stand (C) is a part of the set (N) of rolling mill stands arranged along rolling mill in direction (D) of continuous motion. In compliance with proposed method, at least one mill (CA) of aforesaid set (NA) is assigned the rolling WAIT function at free position of rolls convergence. Other stands inactive position of rolling receive initial preset roll data that control adjustment related with convergence of rolls. In the case of roll replacement in free stand (C) convergence position, initial preset data on roll of said stand and initial preset data on stand rolls still in active rolling position are individually redistributed for every said stand including isolated stand (CA).

EFFECT: better control, optimum specific consumption of metal.

7 cl, 7 dwg

 

The present invention relates to a method of replacement of the roll in the rolling mill for continuously moving steel strip, characterized in restrictive part of paragraph 1 of the claims.

In particular, the invention relates to the technical field of continuous cold rolling steel strip rolling mill of the type tandem in which you want to change the rolls.

Cold rolling of steel strips can be performed on different types of rental units, such as:

the so-called "reversible" rolling installation, in which the rolled strip moves alternately in one direction and then in another direction at least between the two units is made with the possibility of unwinding and winding of the strip during different passes through the rolls. Between these units unwinding/winding a strip rolled in only one rolling stands, which provides installation performance from 200000 to 600000 tons/year, or in two successive stands, which provide performance from 300000 to 1000000 tons/year.

The so-called "tandem" rolling installation, in which the rolled strip is moved in only one direction in several rolling mill stands arranged in series one behind the other and náchod is developing between the input uncoiling unit and the output winding unit in the direction of motion. Mentioned rolling stands, as is known, contain the frame, which are rolling rolls, called "working rolls", backup rolls for limiting the deflection of the work rolls, and in some cases, one or two pairs of intermediate rolls between the supporting rollers and working rollers. In some cases, the application for rental of heavy-duty steel is also used Multiroll mills, for example, so-called rolling mills of sendzimir. There are several types of cold rolling mills of the type tandem: normal mills that process one roll after another with a capacity from 700,000 to 1,500,000 tons of rolled steel per year, however, the capital investment for such mills are large and they require the head section of the roll through the whole installation. Other tandem rolling mills do with the possibility of continuous operation, while the tail part of the roll, leaving the unwinding unit, connect the welding head with a part of the new roll, unwinding the second unwinding unit. Such continuous rolling mills to achieve 1000000 to 3000000 tons/year.

Taking into account investments that are required to ensure continuity of operations of rolling, it is necessary to limit the idle time when the mill does not produce rolling, AndAlso must minimize the consumption of the metal on the car, that is, the number of strips rolled outside the required tolerances.

However, for various reasons, including for maintenance purposes, it is necessary to regularly replace the rolls of the rolling mill, in particular, the work and intermediate rolls or cassettes rolls for multiple-roll cage, and stop rolling during this operation.

Indeed, during the rolling rolls exposed to strong pressure, which leads to their gradual surface deformation, which eventually increases the fragility of the roll and leads to the appearance of cracks or chipping.

On the other hand, the constant contact of the work rolls with rolled strip, and with the support or the intermediate rollers leads to deterioration of the surface that requires their replacement as soon as this state of the surface, in particular, on the last rolling stand at the exit of the rolling mill no longer provides the desired surface quality of the rolled strip.

Finally, depending on the program rolling usually change the diameter of the work rolls or the configuration of the at least one rolling stand, for example, from the option "quarto" to Selivanova or Multiroll option. In this case, you must make a physical replacement of the respective rolls.

To facilitate replacement or Maxim is) to reduce the operations of replacement of the rolls, have already developed automatic equipment and automated processes replacement described in WO 2007 060370. Depending on the installation time of replacement varies from 2 to 3 minutes.

The performance reduction due to replacement of the rolls is particularly noticeable for rolling mill equipped with very small rolls, deformation and wear which come very quickly, for example for multiple-roll mill used for rolling of stainless steel.

If we consider the case of a tandem rolling mill with four cages designed to handle 50,000 rolls (approximately 1,000,000 tons of stainless steel per year, you must stop rolling mill to replace the rolls of the last stand approximately after every 1-3 rolls. Because even a very quick replacement of the rolls takes at least 2 minutes, then, even if the replacement is less frequent, rolls other produce stands "closing time" during the replacement of the rolls of the last stand at the output, the change during the year can reach 1700 hours/year downtime accounted for 24% of the time when the clock work 300 days/year. In the best case, these delays can be reduced by 8% when replacing every three roll, which is still a very significant drawback.

On the other hand, when you start rolling mill (after the stop of movement of the strip) it is impossible to achieve optimal conditions of rolling, and strip car is within the acceptable tolerances of about 50-75 metres strip, which negatively affects the flow of metal.

Attempts were made to replace the rolls without interruption rolling. For example, in document JP 62-275515 described method intended for tandem rolling mill with 6 stands. This method of replacement of the rolls is designed for rolling stands, made with the possibility of installing it, at least one work roll, rolling mill for rolling a continuously moving steel strip, these crate is part of a number of stands arranged in series along the rolling mill in the direction of continuous movement. When for any crates provide a replacement roll (according to the example shown in Fig. 2 of the above document), the stop is prepared by distributing its compression ratio (the percentage reduction in thickness of rent) stands at its input and its output in accordance with the following cycle time:

Increase compression to train (at the entrance of the cage, which produce replacement) by the amount necessary to compensate for the opening stand, which produce replacement, starting from the first stand of a tandem rolling mill, then on the second crate, etc.

Reducing the compression in the cage, which replaces, with save the of only a small residual values.

Increase compression to train (at the output of the stand, in which produce replacement), as it was made for stands at the entrance, first on the stand closest to the cage, which produce the replacement, then the next and so on

Full opening stand, which produce the replacement, together with the increase in compression to stand directly before her.

Replacement roll(s) in the relevant cage.

Closing the cage, which replaces, with reduction compression in the cage directly in front of the said cage, which produce a replacement.

The transition to the initial levels of compression for stands at the entrance, starting from the first stand of a tandem rolling mill, then on the second crate.

Closing the cage, which replace, at its initial level of compression.

The transition to the initial levels of compression for stands at the exit of the cage, which produce replacement, starting from the nearest to her cage.

As can be seen from the above, this procedure requires distributions effort information rolls remaining in the active position of the rolling, as well as speed and torque drives one cage to the other, it is 15 to 20% overload for some stands of this tandem shestiletnego rolling mill. However, the force information mill stands can be increased only is to limit the resistance of the pressure rolls Hertz, which increases with the diameter of the rolls. When this limit is reached, if you want to save the performance margin of 20% in order to change the rolls, the whole complex rolling mill will not be able to operate at maximum capacity and will continue to give lower rates from a performance perspective. Therefore, the gain in performance when the rolls are replaced "on the fly" becomes insignificant or even disappears.

On the other hand, the time cycle of increase and then decrease information of the rolls of the input and output of the stands described in JP 62-275515, does not provide a constant thickness of the strip during the entire process, resulting in uneven thickness at the exit of rolling in some phases and to increase the consumption of metal.

Finally, the scheme is rolled, that is, for a given product and to the required thickness on the output (with the change of the compression ratio in each stand, the speed of rotation of the rolls in each stand, interstand tension), it is necessary to change twelve times for shestiletnego rolling mill throughout the replacement procedure, to distribute on each of the stands at the entrance and at the exit designated replacement part thickness compression not implemented in the cage, which produce a replacement.

This transition from normal rolling with six stands of the rolling five remaining stands, then back to rolling Sestu stands is difficult to manage and may even become critical if increasing the degree of compression lead to changes in the metallurgical behavior of steel, for example, to its hardening.

If this transition occurs simultaneously with the change of the format of the page (under the format should understand its width, its input thickness, metallurgy), navigation control becomes almost impossible. However, in document JP 62-275515 indicated that replacement of the rolls should preferably be during the passage of the welding strip to group length values outside the tolerance characteristic of the replacement roll, and the inevitable cutting operation for removal of the weld. Such combination of the passage of the welding strip with replacement rolls inevitably leads to its coincidence with all the format changes and increases the risk of loss of control over the replacement operation, when any band.

The present invention aims to propose a way to replace the roll(s) rolling stands, made with the possibility of installing it, at least one work roll, rolling mill for continuously moving steel strip, which avoids the aforementioned problems.

The solution for such a method proposed in paragraph 1 of the claims.

In this regard, the method of replacement of the roll(s) rolling stands, made with the possibility of installing it, at least one work roll, hall of the bottom rolling mill (type tandem for continuously moving steel strip, these crate is part of the set of rolling mill stands arranged in series along the rolling mill in the direction of continuous movement, characterized in that:

at least one rolling stand, selected from a variety of stands, give the function the wait rolling in the free position information of the roll(s) (that is, without putting pressure on the strip),

other stands in the active position of the rolling individually reported initially set values that control setting that is associated with the mixing of the roll(s)

- in case of replacement of the roll at the free position information stands initially set value mentioned stands, as well as the initially set values of stands remaining in the active position of the rolling, individually allocate to each of these stands, including the selected cell.

In other words, the mill contains a number of stands, of which one constantly give free function information (referred to dedicated stand). In contrast to the rolling mill, in which one of its many stands withdrawn from the process, the selected cell in accordance with the present invention replaces the crate, which replaces at least one roller. Thus, preferably, you can avoid the new complex distribution CoE is ficient compression on the remaining stands, as setpoints information one stand you can simply pass or to redistribute to another crate, both stand set in the active position of the rolling continuously moving strip. At the same time, this mode of transmission of the setpoint remains in a purely dual form of regulation and, therefore, does not depend on the conditions of the properties and page format, as well as from any match with welding or cutting strip.

Thus, the time cycle of increasing and then decreasing information stands for passed/redistributed specified values can significantly simplify and reduce that enhances control of the strip thickness at the exit of the rolling mill within the required tolerances, and provides optimum specific metal consumption.

Of course, given the simultaneous transmission set values between the respective stands of the invention provides for the replacement of the rolls without stopping the movement of the strip. During the phase of the replacement roll performance rolling mill remains at maximum, as in the phase without changing rolls.

Dependent claims also illustrate the advantages of the invention according to various distinctive features or variants of execution.

What follows is a description of examples of implementation and application with reference to the following prila aimie figures:

Fig. 1A, 1b - replacement method according to the first variant of application of the invention,

Fig. 2A, 2b - replacement method according to the first variant of application of the invention,

Fig. 3A, 3b, 3C - replacement method according to the second variant of application of the invention.

All attached figures presents rolling mill, containing six stands and rolls C1, C2, C3, C4, C5, C6, consistently distributed along the continuously moving strip In the direction D of its movement. For reasons of simplification of the drawing shows a cut only the top of the strip to the plane of symmetry Ah (parallel and equidistant from the two surfaces of the strip). Each for five of the six rolls assigned to the specified value information of R1, R2, R3, R4, R5. In a broad sense is used the term "crate" to designate at least one roller in the cage. Exactly the same will be used, the terms "first mill", "second crate", ..., "N-I stand". This numbering means that the first crate closest to the entrance in the direction D of movement of the strip to the entrance of the strip in the rolling mill), whereas these stands are located next to the exit from the first stand.

In General, presents rolling mill allows to apply the method to change the rolls of the rolling stand, made with the possibility of installing it, at least one work roll, mentioned on p is okaton mill for continuously moving steel strip, these crate With is part of the set N (in this case N=6) of rolling stands arranged in series along the rolling mill in the direction D of continuous motion, thus:

at least one rolling stand, SA, selected from the set N train, give the function the wait rolling in the free position information of the roll(s)

other stands in the active position of the rolling individually reported initially set values that control setting that is associated with the mixing of the roll(s)

- in case of replacement of the roll at the free position information stand With the initially set value mentioned crates, as well as the initially set values of stands remaining in the active position of the rolling, individually allocate to each of these stands, including dedicated stand CA.

The strip is continuously rolled by passing N-1 rolling mill when the total number N stands contained in the rolling mill, while any one of the stands of the rolling mill is either in the process of replacing rolls (and marked with cage), or in the position of waiting for a new replacement operation (and marked crate CA, or).

Thus, the cage With that just replaced the roll(s)remains in the position of waiting, which was initially allocated CL is th, SA, until the next replacement of the roll(s) other crates.

Depending on the relative position of the dedicated stand CA in a state of waiting against the cage, there should be a replacement of the rolls, the method according to the first variant implementation has two versions, shown respectively in Fig. 1A, 1b and 2a, 2b.

In Fig. 1 shows the state of the rolling mill prior to replacement of the roll in the second crate With=C2. If we consider the direction D of movement of the strip, a dedicated stand CA=C6 is the sixth crate C6, which is output toward the second crate With=C2, intended for replacement of the roll. Dedicated stand CA=C6 is in a state of waiting in a free position information. At this stage the first five stands C1, C=C2, C3, C4, C5 are in the active position rolling on each of the initial set values information R1, R2, R3, R4, R5, inform them and provide for rolling strip with increasing pressure. The last set value R5 on the fifth felling C5 allows the band to have a thickness E at the exit of the rolling mill.

In Fig. 1b shows the state of the rolling mill in the phase of the replacement roll (second crate C=C2)shown in Fig. 1A. During the replacement second roll stand With=C2, which is in the direction D of movement closer to the entrance of the originally dedicated stand CA=C6 position of waiting, original is Noah specified value R2 mentioned second crates=C2 moves to the third cell C3, directly behind her, with initial specified value R3 of this third stand C3 goes on just beyond her fourth cell C4, and, if necessary, next in order (as in this case, where the initial specified value R4 this last fourth stand C4 goes on just beyond her fifth cell C5) to a dedicated stand CA=C6 position of waiting, which lead to the active position when rolling the last and fifth preset value R5.

Replacement roll(s) of the second cage With=C2 can occur without stopping the movement of the strip. In this case the second crate you can make a function wait a dedicated stand CA=C6 (which is passed to the function is active rolling) to replace another roll/stand C. Thus, the method can be applied without restrictions of time by simply changing the function wait (without rolling) dedicated stand on one of the stands, where was the replacement of the roll, in anticipation of the upcoming replacement of the crate.

In Fig. 2A shows the state of the rolling mill according to the replacement of the roll shown in Fig. 1A, 1b, occurring on the fifth crates=C5. If we consider the direction D of movement of the strip, a dedicated stand CA=C3 is (in contrast to Fig. 1A, 1b) the third cell C3 is closer to the entrance relative to the fifth crates=C5 intended for C is barter. Dedicated stand CA=C3 is a function of waiting in a free position information. At this stage the first two and the last three stands C1, C=C2, C4, C5, C6 are in the position of active rolling when each of the initial set values information R1, R2, R3, R4, R5, which they reported and which provide for rolling strip with increasing pressure. The last set value R5 on the sixth felling C6 allows the band to have a thickness E at the exit of the rolling mill.

In Fig. 2b shows the state of the rolling mill in the phase of the replacement roll (fifth crate C=C5), shown in Fig. 2A. During replacement of the fifth roll stand With=C5 located in the direction D of movement closer to the exit from the originally selected (third) stand SA=C3 in the position of waiting, the initial specified value R4 mentioned fifth crates=C5 goes to the fourth cell C4, located directly in front of her, while the initial specified value R3 of the fourth stand C4 passes, in turn, just before her third cell C3 (in this case, too, a dedicated stand CA). The first and second stands C1, C2 remain in its position information at the respective predetermined values R1, R2. If it would be necessary in a larger number of stands between intended to replace the crate With and in front of her dedicated stand CA, per the initial set values of these mentioned added trains went to the stand, directly behind them, and so on up to a dedicated stand CA in the position of waiting, which lead to the active position rolling in the third predetermined value R3 (initial set value of the fourth stand before replacing the roll).

Replacement roll(s) fifth crates=C5 can occur without stopping the movement of the strip. Identical to the first variant implementation, shown in Fig. 1A, 1b, this fifth mill stand can be given the function of waiting a dedicated stand CA=C3 (which is passed to the function is active rolling) to replace another roll/stand C. Thus, the method can be applied without restrictions of time by simply changing the function wait (without rolling) dedicated stand on one of the stands, where was the replacement of the roll, in anticipation of the upcoming replacement of the crate.

In two cases, shown in Fig. 1A, 1b and 2A, 2b, we are talking only about the transfer from stand to stand setpoint adjustment belonging to the original schema rolling, not difficult and specific modifying the program rolling.

On the other hand, the transitions of the set values of the adjustment system of automatic control of strip thickness (known by the English name of the Automatic Gauge Control “AGC”) is organized according to the time of passage of the strip between the stands so that no one segment mentioned Polesine were outside thickness tolerance. Thus, the replacement operation does not affect the specific consumption of metal.

Finally, because not instantaneous overload other stands when the load of the compression cage, intended for replacement of the roll(s), all stands can work with maximum efficiency, which contributes to the profitability of their investment in the tandem rolling mill with continuous movement of the strip.

In Fig. 3A, 3b and 3C shows the second variant of application of the invention. Mainly Fig. 3A and 3b is identical to Fig. 1A and 1b, in that the dedicated stand CA=C6 position of waiting is in the direction D of movement of the output of the last stand C5 in the active position of the rolling. Crate CA is dedicated to providing replacement rolls on all the other stands in front of her. It is used only when any stand rolling mill produce the replacement of rolls and only for this replacement. In the absence of the operations of replacement of this selected cell is in a state of waiting (exempt from rolling).

Preferably this dedicated stand CA is placed at the output of the last active stand rolling mill in which the rolls are changed often.

Because Fig. 3A, 3b have already been described, Fig. 3C shows the restoration of the function of waiting a dedicated stand CA after restoring the position of the active rolling which is before her crate With=C2 (which, at least one roller could be replaced during the phase shown in Fig. 3b). Thus, Fig. 3C is a classic return to Fig. 3A.

In particular, as shown in Fig. 3b, during the replacement of the roll on the second crate With=C2 its initial specified value R2 moves to the third cell C3, located directly behind it in the direction D of movement of the initial specified value R3 mentioned are closer to the exit of the cage C3, in turn, goes on just beyond her fourth cell C4 and so on up to a dedicated stand CA=C6, which result in the position of an active rolling during replacement of the roll on the second crate With=C2. Finally, after the replacement second roll stand With=C2, as shown in Fig. 3C, the initial specified value R2 restore on the second crate With=C2, which replaced, respectively, and each of the initial values of the stands C3, C4,..., located next to the exit, and so on until a dedicated stand CA=C6, which is again transferred to the function waiting in the free position information for rolling strip.

1. How to change the rolls of the rolling stand (S)made with the possibility of installing it, at least one work roll, rolling mill for continuously moving steel strip, these crate (S) is part of the centre of the VA (N) of rolling stands, arranged in series along the rolling mill in the direction (D) continuous motion, characterized in that
at least one rolling stands (SA), selected from the set (N) stands, give the function the wait rolling in the free position information of the roll(s)
other stands in the active position of the rolling individually reported initial specified value information of the roll(s)controlling the adjustment associated with a mixing roll(s)
- in case of replacement of the roll cage (C) at the free position information of the roll(s) of the initial specified value information of the roll(s) referred to the cage (S), as well as the initial specified value information of the roll(s) stands remaining in the active position of the rolling, individually allocate to each of these stands, including a dedicated section (SA).

2. The method according to claim 1, in which at the time of the replacement second roll cage (C=C2)located in the direction (D) movement closer to the entrance of the originally selected stands (CA=C6) in the position of waiting, the initial specified value information of the roll(s) mentioned cage (C=C2) transmitting on a crate (C3), located directly behind it, while the initial specified value information of the roll(s) this is the last stand (C3), in turn, is passed on directly to her crate (C4), and, in case n is necessary next in order to the selected stands (CA=C6) in the position of waiting, which lead to the active position rolling.

3. The method according to claim 1 or 2, in which at the time of replacement of the roll cage (C=C5), located in the direction (D) movement closer to the output relative to the cage (CA=C3) in the position of waiting, the initial specified value information of the roll(s) mentioned cage (C=C5) transmitting on a crate (C4), located directly in front of her, while the initial specified value information of the roll(s) this is the last stand (C4) is passed, in turn, is directly in front of her crate (C3), and so next in order to the selected stands (SA) in the position of waiting.

4. The method according to claim 1 or 2, in which the selected cell (CA=C6) in the position of waiting is in the direction (D) motion of the output of the last stand (C5) in the active position rolling.

5. The method according to claim 3, in which the selected cell (CA=C6) in the position of waiting is in the direction (D) motion of the output of the last stand (C5) in the active position rolling.

6. The method according to claim 4, in which at the time of replacement of the roll on the cage (C=C2) the initial specified value information of the roll(s) passed on stand (C3), located directly behind it in the direction (D) motion, the initial specified value information of the roll(s) mentioned are closer to the exit of the cage (C3), in turn, pass on directly to her crate (C4) and so on up to the selected stands (CA=C6), after replacing the roll cage (C=C2) the initial specified value information of the roll(s) to restore the cage (C=C2), which replaced, respectively, and each of the initial specified value information of the roll(s) train (C3, C4, ...), those further to the output, and so on up to the selected stands (CA=C6), which again give the function of waiting in a free position information of the roll(s).

7. The method according to claim 5, in which at the time of replacement of the roll on the cage (C=C2) the initial specified value information of the roll(s) passed on stand (C3), located directly behind it in the direction (D) motion, the initial specified value information of the roll(s) mentioned are closer to the exit of the cage (C3), in turn, is passed on directly to her crate (C4) and so on up to the selected stands (CA=C6), after replacing the roll cage (C=C2) the initial specified value details of the roll(s) to restore the cage (C=C2), which replaced, respectively, and each of the initial specified value information of the roll(s) train (C3, C4, ...), those further to the output, and so on up to the selected stands (CA=C6), which again give the function of waiting in a free position information of the roll(s).



 

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3 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: method is implemented in the following way. Cartridges with working roll from run position "a" is transferred from rolling axis into extreme conducted position "b" for distance ΔL. By means of well-known facilities cartridges with working rolls are taken out in horizontal plane out of bed overall dimensions on-the-mitre α=0-45° to rolling axis, that provides to avoid adjoining to equipment rolling mill. Installation of new cartridges with working rolls is implemented in inverted sequence. Operations of transposition are implemented simultaneously for two cartridges with working rollers.

EFFECT: reduction of delay for transposition and increasing of annual capacity of aggregate in whole.

3 dwg

FIELD: metallurgy.

SUBSTANCE: invention considers devices for working rolls levelling in rolling line, particularly, in four-roll rolling mills by means of, at least, one pair of bushes acting upon roll pads between parallel and distanced racks of rolling mill framework. The device bushes are located so that they can move in horizontal slide plane with regard to the framework racks due to toggle lever adjustment. For this purpose, the pair bushes are interconnected with solid interval. In order to shift both bushes, a special assembly built up from two toggle levers is provided. One lever thereof rests upon the bush through a single joint, while the other rests upon the opposite rack of the shoe through the other joint. Both levers are interconnected by means of the toggle lever joint being moved in longitudinal direction.

EFFECT: reduced time for stand positioning in working position, precise adjustment of rolls, reduced dimensions and simplified structure.

10 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Proposed mill comprises foundation plate to support three-roll stands with rolls with their axes arranged around the circumference at 120° to each other, upper drive secured on the frame at the angle to vertical line and two rolls lateral drives. The C-shape frame supporting upper drive is rigidly attached to foundation plate. Said frame and said foundation plate are furnished with vertical and horizontal guides in contact with rolling stands. Upper drive is inclined at 0-20° to vertical line.

EFFECT: higher stiffness of mill structure, reduced crosswise sizes.

4 dwg

FIELD: process engineering.

SUBSTANCE: proposed device comprises moving plate and rack drive arranged between bed thrust surface and rolls assembly and rolls lifting mechanism. Rack drive rack is mounted on said plate joint with rack drive gear wheel on the mill drive side, while said rolls lifting mechanism is made up of two identical lifting support rolls fitted on eccentric shafts arranged on sides of drive and rolls assembly replacement. Working surfaces of lifting support rolls are arranged on plate bottom side while support roll is arranged above the plate on mill drive side. Clearance is created between support roll working surface and top surface of the plate in its lower position, its size being equal to rolls assembly lift magnitude. Note here that eccentric shaft of rolls lifting mechanism may be driven by worm gears fitted on one shaft.

EFFECT: ease of rolls assembly operation.

2 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to replacement of rolling mill stand (C) rolls. Said mill comprises, at least, one roll for continuous steel strip. Note here that said rolling mill stand (C) is a part of the set (N) of rolling mill stands arranged along rolling mill in direction (D) of continuous motion. In compliance with proposed method, at least one mill (CA) of aforesaid set (NA) is assigned the rolling WAIT function at free position of rolls convergence. Other stands inactive position of rolling receive initial preset roll data that control adjustment related with convergence of rolls. In the case of roll replacement in free stand (C) convergence position, initial preset data on roll of said stand and initial preset data on stand rolls still in active rolling position are individually redistributed for every said stand including isolated stand (CA).

EFFECT: better control, optimum specific consumption of metal.

7 cl, 7 dwg

FIELD: process engineering.

SUBSTANCE: proposed reeler comprises stands with four driven rolls, adjustment devices mounted outside of stand and telescopic shafts. Note here that said reeler comprises central frame with said stands, first platform located at loading side to support replacement stands, second platform locating at unloading side, opposite said loading side, transverse drive to push replacement stands toward those to be replaced. Note also that said stands toward those to be replaced are transferred at second platform to mount replacement stands in central frame instead of stands to be replaced.

EFFECT: higher safety, ruled out manual jobs.

15 cl, 10 dwg

FIELD: process engineering.

SUBSTANCE: quarto rolling mill bearing roll assy comprises roll pads with supports between which equaliser is arranged. Fast and reliable replacement of worn-out rolling tools are ensured by making taper holes at working toll ends at existing rolling equipment. Working roll supports are composed of cones revolving about their axes to displace axially and about their axes and located in appropriate taper bores of working rolls.

EFFECT: easier operation of four-roll rolling mills

3 dwg

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