EP2258491A1 - Rotation tool for a mill train and method for operating a casting-roller compound assembly - Google Patents

Abstract

The tool e.g. roll stand (10) has working rolls (12) for processing rolling stock and driven by an electric motor (20) with superconducting windings. The working rolls are mechanically connected with a shaft (25) of the electric motor, which comprises a common cooling system (26). The rolls are mechanically coupled with each other by a branched gear that is connected with the shaft, where the rolling stock is made of steel, aluminum, copper or titanium. Independent claims are also included for the following: (1) a rolling mill for processing a rolling stock (2) a casting and rolling composite system for continuous production of hot strip (3) a method for operating a casting and rolling composite system (4) a method for improving performance of a rolling mill.

Description

The invention relates to a rotary tool for processing rolling stock, in particular consisting of steel, aluminum, copper or titanium, in a rolling mill, as for example from DE 199 11 751 C1 evident. Moreover, the invention relates to a rolling mill, a cast-rolling composite plant, a method for operating a cast-rolling composite plant and to a method for increasing performance.

Metallic precursors such as slabs, hot or cold strip, sheets, tubes, etc. from materials such as iron, steel, non-ferrous metals or other metallic materials are undergoing large-scale industrial processing in rolling mills various processing and refining steps. Typical processing steps are the rolling of cast slabs to hot strip or the down rolling of the hot strip to the thickness desired by the customer in a cold rolling train, for example a tandem mill.

Rolling mills conventionally occur as separate units, which deliver their rolling stock, for example, from a separate continuous casting device, e.g. received a "continuous casting system". In modern cast-rolled composite plants, hot strip can be produced in a continuous process, in particular endlessly.

A typical tool for processing rolling stock is a rolling stand, with which e.g. Slabs can be rolled in successive rolling passes to form a strip. Rolling mills are used in almost all rolling mills, in particular in hot and cold rolling mills.

After hot rolling, the strips can be subjected to further processing steps. At the end of the rolling mill is the rolled-down strip is usually rolled up with the help of a reel to so-called "coils". Alternatively, a direct coupling with a cold rolling plant and / or treatment line takes place in the continuous process.

The hot strip can be subjected to further intermediate steps, such as a temperature treatment, before it is fed to a cold rolling line. At the end of a cold rolling line is usually a take-up reel for receiving the rolled strip, possibly combined in the continuous process with a pair of scissors.

In the aforementioned processing steps, high torques must be applied for machining the rolling stock. For this reason, powerful electric motors are used to drive the machining tools whose torque is often further increased by means of a reduction gear. Powerful electric motors as well as correspondingly suitable transmissions are very heavy and voluminous.

For example, resulting from the resultant space requirement of the rotation tools used so far rolling stand distances, which must be bridged in an undesirable manner by means for material transport. Another consequence of the high stand spacing are lead times between the forming passes, which lead to significant and undesirable temperature losses, especially in the hot rolling process. In the example mentioned, this has the consequence that the product spectrum has to be limited, for example, with regard to the final millable thickness and / or the productivity (throughput) is reduced.

The object of the present invention is to provide a rotary tool for processing rolling stock, a rolling train and a cast-rolling composite plant with such a rotary tool and an operating method for the cast-rolling composite plant and a method for improving performance, which / which by means of his / her drive concept the metallurgical simplify, improve and / or make more flexible roll manufacturing processes.

With respect to the rotary tool, the object of the invention is achieved by a rotary tool having the features of claim 1. With regard to the rolling mill, the object of the invention is achieved by a rolling mill with the features of claim 9. With respect to the casting-rolling composite plant, the inventive The problem solved by a cast-rolling composite plant according to claim 16, with regard to the method of operation by a method according to claim 19 and with respect to the method for increasing the efficiency by a method according to claim 20.

The rotary tool according to the invention for processing rolling stock in a rolling train is driven by an electric motor having electrically superconducting windings.

As rolling stock, for example, slabs, hot strip, cold strip, coarse or thin sheets, pipes, etc. of iron, steel, non-ferrous metals such as aluminum, etc. into consideration. Under a rotary tool for processing of rolling all rotationally driven tools, machines, apparatus or devices are understood, which engage directly in the machining process of the rolling stock. Examples are: rolling stands, reels, drum shears, temporary storage etc.

An electric motor with superconducting windings will be referred to as HTS motor in the following. Under an HTS motor, both a machine whose rotor winding is superconducting and whose stator winding is normally conducting, and a machine, so-called fully superconducting machines, in which both the rotor and the stator winding is made using superconducting material to understand.

• Zum Betrieb eines Rotationswerkzeugs in einer Walzstraße werden hohe Leistungen bzw. Drehmomente benötigt, die lediglich von entsprechend großen/voluminösen Elektromotoren erbracht werden können. Diese müssen vielfach zur weiteren Erhöhung des Drehmoments mit einem Getriebe versehen werden. Entsprechend weist der Antrieb des Rotationswerkzeugs eine große Baugröße auf. Die große räumliche Ausdehnung von Getriebe und Motor sowie deren hohes Gewicht führt dazu, dass die Konstruktion einer kompakten Walzstrasse bislang nur bedingt möglich ist.

The construction of the rotary tool according to the invention is based on the following considerations:

• To operate a rotary tool in a rolling mill high powers or torques are required, which can be provided only by correspondingly large / voluminous electric motors. These must often be provided to further increase the torque with a gear. Accordingly, the drive of the rotary tool on a large size. The large spatial extent of gear and motor and their high weight means that the construction of a compact rolling mill is so far only partially possible.

According to the invention it has been recognized that the above technical problems can be overcome by the use of HTS motors, which have a much smaller size with the same power compared to conventional electric motors. In addition, it was recognized that the use of an HTS engine - especially in a rolling mill - considerable energy savings (lower power dissipation) and because of possible reduced aggregate distances also brings cost advantages. This is particularly advantageous in cast-rolled composite systems.

According to a first embodiment, the rotary tool is a rolling stand which has at least two work rolls between which the rolling stock is machinable, and wherein at least one of the work rolls is driven by the HTS motor. Such a rolling stand can be used both in hot and cold rolling mills. For example, while used in a hot rolling mill for slab rolling, a rolling stand in a cold rolling mill is used to roll down hot strip to the thickness desired by the customer. The rolling stand can be designed, for example, as a duo or as a quarto-rolling mill or as a hexagonal rolling mill. Since the rolling mill is driven by a more compact HTS motor with the same power, the distances between the rolling stands can be selected smaller and the entire rolling train can be made shorter or more compact. The inventors have recognized that use of an HTS motor in the rolling mill thus brings with it significant cost reductions as well as technological advantages as a result of reduced cooling of the continuous rolling stock.

An HTS engine has a more stable, stiff performance (e.g., small rotor angle) and also reacts faster to changes in command values than a conventional electric motor. This case occurs frequently during rolling. In comparison to a conventional electric motor, an HTS motor is thus able to be regulated more quickly, which allows an improved and / or faster puncture behavior and / or an improved ski control particularly when it is used in a rolling train. This is particularly advantageous in heavy hot rolling reversing lines. As a "ski" is an unintentional deformation of the band up or down, i. referred to perpendicular to the transport direction.

According to a development at least one of the work rolls is gearless or connected by means of a reduced compared to a conventional electric drive gear with the shaft of the electric motor. In other words, in the first variant, the mechanical connection between the shaft of the HTS motor and the work roll of the rolling mill is carried out while dispensing with torque-converting mechanical intermediate elements (gear). For example, the shaft of the electric motor may be connected to the work roll via a common shaft or a spindle. The spindle is understood to mean, for example, a double-jointed shaft with two universal joints present at the end, which serves to transmit torque between the drive shaft of the motor and the work roll of the rolling mill stand. The absence of a gear not only brings a cost advantage, but also increases the reliability and variability of the mill. According to the property can provide the HTS engine compared to a conventional engine with a comparable size increased torque can - be reduced - as a second variant - the size of the transmission. Both variants allow a cost reduction of the entire system. The variant without gearbox requires less maintenance.

A special configuration of the rolling stand, in which according to the invention the HTS motor is advantageously used, are the so-called twin drives in which each of the work rolls is driven by an electric motor. Accordingly, according to a further embodiment, the rolling stand is configured such that it comprises a plurality of HTS motors, wherein each of the work rolls - preferably as described above directly or with a reduced gearbox - is mechanically connected to the shaft of one of the HTS motors. Since, compared to conventional electric motors, the HTS motors are smaller in size for the same torque, e.g. due to a smaller stator diameter, the distance between the drive shafts of the motors can be reduced to each other. This is also positively noticeable that at the same time the existing inclination of the spindles can be reduced or the torque of the motors can be increased while maintaining the spindle angle. By reducing the spindle tilt their wear, especially in the universal joints, can be reduced. As a third measure / variant, the spindle length can be shortened with the result of a better control behavior, because long spindles act like springs.

In a twin drive, the electric motors are arranged directly next to one another or locally above one another (offset from each other). According to a further embodiment, these therefore advantageously have a common cooling system.

However, the use of an HTS motor is not only advantageous in directly driven rolling stands, such as the aforementioned twin drives, but also in a roll stand, which after a further embodiment comprises two work rolls, which are mechanically coupled via a branching gear, said drive side is coupled to the shaft of the electric motor. According to a development, the branching gear is a pinion gear, since this withstands high torques.

According to a further embodiment, the rotary tool is a reel. Alternatively, the rotary tool is a drum shears. In both a reel and a drum shear, high torques must be applied in the short time of the acceleration and / or deceleration phase to accelerate or decelerate the rotary tool to the desired operating speed. Due to its low moment of inertia and superior control behavior, an HTS engine is particularly suitable.

The material of the windings of the HTS motor according to a further embodiment comprises metallic LTC superconductor material ("LTC" = Low Temperature Conducting). For example, bismuth-based superconducting material which is technically proven, resistant and thus easy to process is suitable. The superconducting material for the windings of the HTS motor may be selected to have a critical current density of more than 300 A / mm ² at an operating temperature of 4.2K.

To reduce the cooling expense, it is expedient that the material of the windings of the HTS motor contains metal oxide HTC superconductor material ("HTC" = High Temperature Conducting). As HTC superconductor material, for example YBCuO is suitable, which has a higher transition temperature than metal oxide LTC superconductor material. The cooling overhead in the operation of a HTS motor with windings of HTC superconductor material is therefore correspondingly lower.

Preferably, therefore, an operating temperature between 10 and 40 K, preferably between 20 and 30 K, provided for the windings of the HTS motor. In the stated temperature range, metal oxide HTC superconductor material also has a high critical current density and a high critical field.

The rolling mill according to the invention serves for the processing of rolling stock with the rotary tool according to the invention. Essential advantages mentioned in connection with the rotary tool apply in the same way to the rolling train according to the invention. The rolling train has at least one ("1") mill stand.

According to a development, the rotary tool is a rolling mill, wherein the rolling train comprises a plurality of rolling stands immediately adjacent in a rolling direction, in particular in tandem operation.

The rolling train is either a roughing train and - with particular advantage - a finishing mill of a hot rolling mill.

In this case, the rolling train, which is in particular a finishing mill of a hot rolling mill or hot strip rolling mill, expediently comprises a plurality of electric motors with superconducting windings and at least three or at least four of the rolling stands respectively at least one of the work rolls gearless connected to the shaft of one of the electric motors.

It was recognized that the rolling stands in a rolling mill, due to the spatial extent of rolling stand, gear and electric motors, must comply with a minimum distance, the minimum distance of the rolling stands by the size of the scaffold stands of possibly necessary Zwischengerüsttransporteinrichtungen, electric motors or Gear limited. By using rolling stands driven by a HTS motor, the minimum distance can be immediate adjacent rolling stands and so, for example, the unwanted cooling of the rolling stock can be reduced by reduced thermal radiation.

In such an arrangement, according to a further embodiment, adjacent rolling mills have particularly advantageously a common cooling system.

Particularly in the case of continuous hot rolling mills, the distance between the rolling mills causes undesirable changes in the state variables of the rolling stock. The stand spacing of today's hot rolling mills in conventional construction is typically more than 5.0 m to 5.5 m. As a result of such distances, the rolling stock may, for example, cool down too much between the individual rolling passes or form scales on the surface. Such effects must be compensated by additional units such as an induction furnace or a Entzunderungsaggregat. The use of such additional units and their integration in the rolling mill is expensive on the one hand and resource-intensive on the other hand.

The distance of the rolling stands can be reduced by the use of drive motors with superconducting windings, whereby additional aggregates, e.g. can be omitted for descaling or for heating the rolling stock.

According to a preferred embodiment, in the rolling train, which is in particular a hot strip mill or / and a finishing train of a hot strip rolling mill, preferably in tandem, at least two of the rolling stands for a maximum rolling force of more than 1500 t, in particular of more than 2,000 t, more than 2,500 t, more than 3,000 t, more than 3,500 t or more than 4,000 t, and these two rolling mills have a spacing of less than 5.0 m, preferably less than 4, in the rolling direction , 5 m, less than 4.3 m, less than 4.0 m, less than 3.9 m, less than 3.7 m or less than 3.5 m.

The distance of the rolling stands is determined here as the distance of the axes of rotation of the work rolls of adjacent rolling stands in the rolling direction.

Furthermore, the rolling train preferably has a control and / or regulating device-designed, for example, as part of the process automation, in particular for controlling a heating device, a cooling section, a finishing stack and / or a speed of the rolling train, which is designed such that a result HTS engines are considered less expensive than conventional engines for reduced heat loss in the rolling stock. This can be done by implementation in an underlying model. Particularly appropriate is the consideration of the reduced heat loss in the process automation system of the finishing scale, including in the regulation of the finished strip temperature and / or on the reel temperature.

With preference, an optional - possibly existing between the rolling stands - transport device is designed as a vertical loop lifter. This achieves a further reduction in the distance between the stands.

According to a further preferred embodiment, the rolling train is part of a cast-rolling composite plant for the continuous production of hot strip. The processing speed of a cast-rolling composite plant is determined by the speed of the caster. Consequently, the state changes of the rolling stock occurring between the individual rolling passes, for example the cooling thereof, can not be compensated in a simple manner by increasing the rolling speed. The inventors have recognized that a reduction in the distance of the rolling stands thus represents a very advantageous possibility of effectively avoiding intermediate units, such as descaling systems or induction furnaces, for example, or making them less complicated. A reduced distance The rolling stands can be achieved by using a HTS engine.

Preferably, in the cast-rolling composite plant having a heating means arranged before or after the rolling mill for heating the belt cast from a casting apparatus, the heater is adjusted for heating power in consideration of a reduced heat loss in the rolling stock or strip due to the electric motors used ,

In the limit case, the cast-rolling composite plant can be carried out completely without such a heater.

wobei für den Faktor k gilt: k = 0,14(MW·h/t), insbesondere k = 0,13(MW·h/t), k = 0,12(MW·h/t) oder k = 0,11(MW·h/t). Dabei steht MW für Megawatt, h für Stunden und t für (metrische) Tonnen.The method-related object is achieved according to the invention by a method for operating a cast-rolled composite plant, wherein rolling or strip material - preferably steel - is transported through the mill train at a mass flow rate (m as mass per time) and wherein the heater with a heating power (P) is operated according to: $$\mathrm{0}\mathrm{\le }\mathrm{P}\mathrm{<}\mathrm{k}\mathrm{\cdot }\dot{\mathrm{m}}$$

where k = 0.14 (MW × h / t), in particular k = 0.13 (MW × h / t), k = 0.12 (MW × h / t) or k = 0 for the factor k , 11 (MW · h / t). Here, MW stands for megawatts, h for hours and t for (metric) tons.

In the context of the invention is also a method for increasing the performance of an existing rolling mill comprising at least one rolling stand with non-superconducting and arranged in a limited space motor drive. In the power enhancement method, the non-superconducting motor is replaced by a HTS motor that does not exceed the installation space limitation, ie an electric motor with superconducting windings, which is designed such that the maximum rolling moment in the rolling stand is increased compared to the existing rolling line is. It is designed either superconducting only the rotor, or only the stator, or both.

Figur 1

eine Kaltwalz-Tandemstraße in schematischer Per- spektivansicht,

Figur 2

eine schematisierte Warmwalzstraße in Perspektivan- sicht,

Figur 3

einen Zwillingsantrieb ("Twin-Drive") eines Walzge- rüsts in einer schematischen Querschnittsansicht,

Figur 4

eine schematisierte Tandemwalzstraße in (geschnit- tener) Draufsicht,

Figur 5

eine schematisch dargestellte Gieß-Walz- Verbundanlage,

Figur 6

ein Walzkraft-Gerüstabstands-Diagramm, und

Figur 7

eine Walzgerüstausführung mit Schlingenheber, in einem schematischem Längsschnitt.

In the following the invention will be explained in more detail with reference to embodiments shown in the drawing. It shows their

FIG. 1

a cold rolling tandem mill in a schematic perspective view,

FIG. 2

a schematic hot rolling mill in perspective,

FIG. 3

a twin drive of a rolling stand in a schematic cross-sectional view,

FIG. 4

a schematized tandem rolling mill in (cut) plan view,

FIG. 5

a schematically illustrated cast-rolled composite plant,

FIG. 6

a rolling force stand distance diagram, and

FIG. 7

a rolling mill version with looper, in a schematic longitudinal section.

A tandem cold rolling mill 2, like her FIG. 1 shows, serves to roll down of hot strip 4 to the customer's desired thickness. For this purpose, the coiled to a hot rolled strip 4 of the tandem cold rolling mill 2 by means of a take-off reel 6 in a rolling direction W is supplied. The thickness of the hot strip 4 is first determined by means of a measuring device 8, then the strip is rolled down in several successive rolling passes by means of rolling stands 10 to the desired thickness. Each of the rolling stands 10 has at least two work rolls 12 and two support rolls 14, wherein the rolling stock, in this case the hot strip 4, is processed between the work rolls 12. At the end of the rolling process, the tape is rewound into a coil by means of a coiler 16. For the separation of the belt transversely to the rolling direction W, a dividing shear 18 is available. The reel 16 is driven by a HTS motor 20. The shaft of the HTS motor 20 is directly to the axis of the coiler 16, ie, no transmission between the HTS motor 20 and the reel 16 is used. The same does not apply to the FIG. 1 shown drive the uncoiler 6 to. The work rolls 12 of the rolling stands 10 are either as twin drives, exemplified for the second rolling stand 10 in the rolling direction W, or using a branching gear, in this case a pinion gear 22, as exemplified for the third rolling stand 10 in the rolling direction W driven , In the rolling stand 10 designed as a twin-drive, both work rolls 12 are each directly connected to the shaft of a respective separate HTS motor 20 (both denoted by 20). Thus, there is a direct drive of the work rolls 12, being dispensed with a reduction gear.

Alternatively, as shown in the roll stand 10 following in the rolling direction W, the work rolls 12 can be driven via the pinion gear 22, which on the drive side in turn is connected to a (here only single) HTS motor 20.

The rewinding and reeling 16.6 and the rolling stands 10 are connected to a common control and / or regulating device 105, which will be discussed in detail later.

FIG. 2 shows a hot rolling mill 30 with the preheated slabs 32 are rolled to hot strip 4. For this purpose, the slabs 32 are first rolled in a roughing train 34 and later with a consisting of several (here: seven) rolling stands 10 finished stagger 36 (finishing mill) to hot strip 4. This is rolled up by means of a reel 16 to form a coil. The individual rolling stands 10, each in to FIG. 1 similar execution two work rolls 12 and two support rollers 14 are driven by HTS motors 20 both in the roughing 34 and in the finishing stack 36. The same applies to the Aufhaspel 16. The rolled strip has a width of 0.6 m to 1.8 m, typically 0.8 to 1.6 meters. The work rolls can be up to 5.5 m wide (= measured along the axis of rotation).

FIG. 3 shows a highly schematic (vertical) cross-sectional view of a rolling stand 10 of the tandem cold rolling line 2 of FIG. 1 or, more preferably, the hot rolling mill 30 of FIG. 2 , whose work rolls 12 are driven by a twin drive ("Twin Drive"). For this purpose, each of the work rolls 12 is connected with its shaft 23 via a spindle 24 to the motor shaft 25 of an HTS motor 20. The connection between the shaft 23 of the work roll 12 and the spindle 24 and between this and the motor shaft 25 takes place in each case by means of a universal joint or by means of waves with claws. Compared to conventional electric motors used in twin drives, the in FIG. 3 shown HTS motors 20 a low height H on. This results in that the distance A of the motor shafts 25 is smaller than in conventional drives and thus the spindle pitch α is low. Under the spindle pitch α is the angle between the spindle 24 and the extension of the shaft 23 of the work roll 12 to understand. The spindle pitch α results from the offset between the shaft 23 of the work roll 12 and the motor shaft 25, which is bridged by the spindle 24. Preferably, the spindle pitch α <3 °, for example, 1.5 ° - 2.5 °.

The HTS motors 20 have a common cooling system 26, with which their superconducting windings are cooled. The cooling system 26 is an insulated pipe system generally known from cryotechnology, in which a refrigerant circulates and in which a refrigeration unit 28 is integrated. This usually includes a reservoir for the refrigerant, which is, for example, liquid helium, neon, nitrogen or a mixture of these gases. The refrigeration unit 28 also includes a compressor or a cold head for liquefying the coolant. The circulation of the coolant in the cooling system 26 can be done by means of a pump or driven by a thermosiphon effect.

FIG. 4 shows a schematic representation of four rolling stands 10 of a running in tandem assembly hot strip finishing line of a hot rolling mill, as for example FIG. 2 as Fertigstaffel 36 of the hot rolling mill 30 shows, in plan (cross) view. The rolling stands 10 are waiving other units, such as induction heaters or Entzunderungsanlagen in the rolling direction W immediately adjacent to each other, which is possible due to the compact size of their used for driving HTS motors 20. The rolling stands 10 can thereby reach a distance B from one another, which can not be achieved with conventionally driven rolling stands 10. As a distance B while the removal of the axes of rotation D of the work rolls 12 is defined in the rolling direction W.

The work rolls 12 are driven directly by the HTS motors 20, i. the shaft 23 of the work roll 12 and the motor shaft 25 of the HTS motors 20 form a common component. The HTS motors 20 of the rolling stands 10 arranged directly next to one another have a common cooling system 26 with an integrated refrigeration unit 28.

Due to the more compact design and narrower design, the heat losses are significantly reduced. This can be advantageously taken into account in a cooling model for the rolling mill in a superordinate (not explicitly drawn) control system for influencing the metallurgical changes in the rolling stock during rolling.

FIG. 5 shows a continuous casting belt-rolling plant 40 in which from a casting platform 42 in a Dünnbrammengießeinrichtung 44 continuously thin slabs are produced, which via a roller table 45 continuously, ie without cutting, winding and intermediate storage, a first rolling mill 46 ( "High Reduction The motors of this rolling train 46 are designed as HTS motors, as are the drives of the following optional splitting and / or discharging device 48, which may comprise a pendulum shear and a "plate pusher." This device 48 is particularly significant in case of subsequent malfunctions in the direction of production, and an optional cropping shear may also have an HTS drive.

This is followed by a heating device 52, a descaling device 54, a second finishing mill 56 ("finishing mill"), a cooling section 58, an end shear 60 for cutting to desired product length and a windup device 62 for the finished product ("coil"). The drives of the rollers of the second rolling train 56 are designed as HTS motors, which brings with it special space advantages just as with the rollers of the first rolling train 46.

Due to the correspondingly compact and short design can be on means for supplying additional heat (eg "bar heater") to avoid unwanted premature cooling of the belt, either completely omitted or the corresponding devices are smaller in size than without the use of HTS motors , In the FIG. 5 For example, an induction furnace is shown as a heater 54, the heating power P - is chosen smaller - with the same mass flow rate - than with conventional electric motors. With a mass flow rate m of 180 tons of steel per hour (t / h), its heating power P = 25 megawatts (MW), preferably only 23 MW or only 19 MW.

The invention has not only effects on the dimensioning of a rolling mill, but also on the control of the system and its components. Therefore, a control and / or regulating device 105 (FIG. FIGS. 1 . 2 . 5 ) Walzstrasse 2, 30, 46 and 56 or the cast-rolling composite system 40 for controlling a heater 52, a finished relay 56, a cooling section 58 and / or a speed of Walzstrasse, formed such that a reduced due to the superconducting electric motors used compared to a conventional motor heat loss is taken into account.

FIG. 6 shows in the hatched area 100, the preferred design according to the invention of rolling trains, for example, finishing lines of a hot strip mill, the distance B in the rolling direction of two rolling stands up and the maximum of the rolling stands producible rolling force F is given to the right. "Small plants" with a maximum rolling force of less than 1000 t (metric tons) are not considered in the example. The stand spacing B according to the invention is smaller than 5 m even with very large rolling forces (line 101). The straight line 102 clarifies the recognition that with increasing rolling force more and more space for the drive systems and motors is needed because they have to work against increasing forces in the nip, so that ultimately increases the distance from the framework.

The straight line 102 can be described by the following equation: B max = a + F * b, in which a = 2 m, b = 1 m / 1000 t or a = 2.5 m, b = 1 m / 2000 t or a = 0 m, b = 1 m / 500 t

According to the invention, ie when using one or more HTS motors, for a certain rolling force F to be applied by the rolling stand, the distance B of the rolling stands is chosen to be smaller than the value for Bmax resulting from the formula: B = B max - c, in which c = 0, 4 m, 0, 6 m, 0, 8 m, 1, 0 m, 1, 2 m or 1, 4 m. FIG. 7 shows an optional design for further reduction of the stand spacing B, in which between two rolling stands 10, a loop lifter 110 as a transport device is available. An actuating cylinder 112 performs essentially only a vertical or up and down movement to support the belt 4 and thus requires very little space.

Claims (20)

Rotary tool (6,10,16) for processing rolling stock (4,32), in particular consisting of steel, aluminum, copper or titanium, in a rolling train (2,30), which is driven by an electric motor (20) with superconducting windings , Rotary tool (6,10,16) according to claim 1, wherein the rotary tool (6,10,16) is a rolling stand (10) having at least two work rolls (12), between which the rolling stock (4,32) is machinable, and wherein at least one of the work rolls (12) is driven by the electric motor (20). Rotary tool (6,10,16) according to claim 2, wherein at least one of the work rolls (12) gearless or by means of a reduced compared to a conventional electric drive transmission with the shaft (25) of the electric motor (20) is connected. Rotary tool (6,10,16) according to claim 2 or 3, comprising a plurality of electric motors (20) with superconducting windings, wherein the work rolls (12) in each case with the shaft (25) of one of the electric motors (20) are mechanically connected. Rotary tool (6,10,16) according to claim 4, wherein the electric motors (20) have a common cooling system (26). Rotary tool (6,10,16) according to claim 2, comprising two work rolls (12) which are mechanically coupled via a branching gear (22), wherein the branching gear (22) on the drive side with the shaft (25) of the electric motor (20) is connected , Rotary tool (6,10,16) according to claim 1, wherein the rotary tool (6,10,16) is a reel (6,16). Rotary tool (6,10,16) according to claim 1, wherein the rotary tool (6,10,16) is a drum shears. Rolling train (2.30), in particular hot rolling mill, for processing rolling stock (4, 32) with at least one rotary tool (6, 10, 16) according to one of Claims 1 to 8. Rolling train (2, 30) according to claim 9, wherein the rotary tool (6, 10, 16) is a rolling stand (10), and the rolling train (2, 30) has a plurality of rolling stands (10) immediately adjacent in a rolling direction (W). includes. Rolling train (2,30) according to claim 10, in particular finishing mill of a hot rolling mill, comprising a plurality of electric motors (20) with superconducting windings, at least three or at least four of the rolling stands (10) each having at least one of the work rolls (12) gearless with the shaft (12). 25) of one of the electric motors (20) is connected. Rolling train (2,30) according to claim 10 or 11, wherein the electric motors (20) of adjacent rolling stands (10) have a common cooling system (26). Rolling train (2, 30) according to one of Claims 10 to 12, in particular hot strip mill and / or finishing train of a hot strip rolling mill, preferably in tandem design, in which at least two of the rolling stands (10) have a maximum rolling force (F) of more than 1500 t , in particular of more than 3000 t or more than 4000 t, are designed and have a distance (B) of less than 5.0 m, preferably less than 4.5 m or less than 4.0 m. Rolling train (2,30) according to any one of claims 10 to 13, wherein a control and / or regulating device (105), in particular for controlling a heating device (52), a finished relay, a cooling section (58) and / or a speed of the rolling train , Is formed such that due to the superconducting electric motors used (20) opposite a consideration of conventional engines reduced heat loss of the rolling stock (4; 32) is taken into account. Rolling train (2,30) according to one of claims 10 to 14, wherein between the rolling stands (10) a transport device is provided, which is designed as a vertical loop lifter (110). Cast-rolled composite plant (40) for the continuous production of hot strip (4) with a rolling mill (2,30; 46) downstream of a casting device (44) according to one of Claims 9 to 15. Casting-rolling composite system (40) according to claim 16 without heating means (54) for heating the belt cast by the casting device (44). A cast-roller composite plant (40) according to claim 16, further comprising a heating means (54) disposed in front of or behind the rolling line (46) for heating the strip cast from the casting device (44), the heating means (54) having a heating capacity (P) is prepared taking into account a reduced as a result of the electric motors (20) heat loss in the rolling stock (4; 32) or band. A method of operating a cast-roller composite plant (40) according to claim 18, wherein rolling stock - preferably of steel - with a mass flow rate (m) through the rolling line (46) is transported and wherein the heating device (54) with a heating power (P). is operated according to: $$\mathrm{P}\mathrm{<}\mathrm{k}\mathrm{\cdot }\dot{\mathrm{m}}$$

where k = 0.14 (MW × h / t), in particular k = 0.13 (MW × h / t), k = 0.12 (MW × h / t) or k = 0 for the factor k , 11 (MW · h / t). A method for increasing the performance of an existing rolling mill comprising at least one rolling stand (10) with non-superconducting and arranged in a limited space motor drive, wherein the non-superconducting motor is replaced by a construction space not exceeding bordering electric motor (20) with superconducting windings designed in such a way is that the maximum rolling torque in the roll stand (10) compared to the existing rolling mill is increased.

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