DE102014207859A1 - Process and rolling stand for cold rolling of rolling stock - Google Patents

Abstract

The invention relates to a method and a roll stand for cold rolling rolled material. The roll stand comprises at least an upper and a lower support roll and an upper and a lower work roll, which span a roll gap. Optionally, a lower and an upper intermediate roll can also be provided between the work rolls and the backup rolls. In order to ensure an absolutely identical circumferential speed in the upper and lower work rolls during cold rolling in skin pass operation, it is proposed according to the invention to decouple the upper or the lower work roll from its associated drive device.

Description

The invention relates to a method for operating a roll stand for cold rolling of rolling stock. The rolling stand comprises at least an upper and a lower support roll and an upper and a lower work roll, which span a roll gap. Optionally, a lower and an upper intermediate roll may also be provided between the work rolls and the support rolls. In addition to the method, the invention also relates to said roll stand.

Roll stands and methods for their operation are basically known in the art, for example from the EP 1 318 879 B1 , of the DE 4417274 C2 , of the EP 1 420 898 or the DE 4417274 , In addition, reference is made to the following literature on the subject of cooling or lubricant during cold rolling of rolling stock: DE 19744503 A1 . EP 1 173 295 . DE 10 2004 025 058 . EP 1 399 277 and DE 10 2007 032 4857 (= WO 2008/071277 ) JP 620688613 A and Selzer, H., Developments in the Cold Rolling Area, Cold Rolling Symposium, SMS Siemag AG, Hilchenbach-Dahlbruch, DE, 16-17.02.2000 ,

In the prior art, a distinction is fundamentally made in rolling stands between reducing stands and temper rolling stands.

Reduziergerüste have the task to reduce per stitch 30 to 80% of the thickness of the rolling stock. At these high degrees of deformation occur high rolling forces and rolling moments. Therefore, a roller cooling with high efficiency is necessary. Here are up to 10,000 l / min. per mill converted to cooling amount. The work rolls in the reducing stand are of relatively smooth surface without special texturing. In Reduzierbetrieb the upper backup roller is on the upper intermediate roll and this in turn on the upper work roll on. If the intermediate roll is missing, as in the four-roll stand, then the upper support roll rests directly on the upper work roll. The rolling forces are in the range of 10 to 20 MN. The rolling moments are in a range of 100 to 200 kNm. When reducing, a special thickness control is used, which can be operated both in the position control mode, as well as rolling force control mode. The essential actuator of the thickness control during reduction are almost exclusively the adjusting cylinders of the support rollers and only in peripheral areas of the strip tension.

Reducing stands can be in six-roller or four-roller design, d. H. be formed with six or four rollers. In Reduzierbetrieb typically both work rolls are rotated to transmit a rolling torque on both work rolls. Such reducers are known both for reducing iron metal and for reducing non-ferrous metal. The only noteworthy difference between the operation of ferrous metal and non-ferrous metal reducers is the use of the appropriate cooling lubricant; The cooling lubricant is a (number word) means with the two functions cooling and lubricating. For non-ferrous metal, especially for aluminum, rolling oil is typically used as the cooling lubricant.

However, in addition to the pure reducing stands for ferrous metal and non-ferrous metal just described, pure skin pass mills are known only for iron metal. Dressing scaffolds have the task to impress a texture on the rolling stock, to improve the flatness and / or to improve the material properties of the rolling stock, for. B. Eliminate Lüders bands or adjust certain strengths. For embossing the texture on the rolling stock, therefore, the typically smooth work rolls are used by special temper rolling with a predetermined roughened surface. In the case of temper rolling, typically only a single pass is made with a rolling stock reduction of 0.3 to 10%. By imprinting the texture material abrasion occurs on the rolling stock, so-called tinsel, which has a disturbing effect on further processing and heavily contaminates the tempering medium. In the case of temper rolling, the rolling force and the rolling moment are very low in comparison with a reduction operation, specifically, the rolling forces during the temper rolling range in the range of 1 to 4 MN. The rolling torques are typically in a range of 0 to 20 kNm. The applied amount of tempering agent is about 20 l / min. per side of the rolling stock at a significantly lower level compared to the reduction operation. The main task of the tempering agent is essentially the cleaning of the rolling stock or the rolls. During the temper rolling operation, typically neither of the two work rolls is driven; instead, only the lower support roller is driven, thus transferring a rolling moment to it. In the tempering operation, the rolling force can be applied either via the adjusting cylinder of the upper support roller; this presupposes, however, that the upper support roller rests either on the upper work roll or, if present, on the upper intermediate roll. Alternatively, the upper backup roll may also be lifted from the upper work roll or, if present, from the upper intermediate roll. Then, the application of the rolling force in the skin pass through a suitable employment of the upper bending cylinder, which act either on the upper work roll or - if present - on the upper intermediate roll.

In addition to the pure Reduziergerüsten and pure tempering scaffolds just described there are also Kombigerüste, which can be operated both in a Reduzierbetrieb as well as in a temper mill, but only for ferrous metal, not for non-ferrous metal.

The known pure Reduziergerüste for non-ferrous metal are for a combined operation, d. H. for an alternative non-ferrous metal pass mill, not suitable because the reducers are designed for rolling forces that would be too high for a non-ferrous metal pass mill. The frictional forces within the hydraulic setting are approximately proportional to the maximum force, i. a positioning cylinder that has been designed for high forces can not work due to its internal friction in the required accuracy at low rolling forces.

In Reduziergerüsten usually two rollers, i.d.R. the work rolls driven to transmit the required rolling torque as evenly as possible in the nip. Smallest differences in diameter between the work rolls lead to moment differences between the rolls, which, however, do not have a detrimental effect on the rolling result, because the high decreases compensate for the rolling stock, e.g. by shear effects, takes place. In the case of temper rolling with small reductions / tempering degrees, this internal compensation can not take place because only near-product roll formations take place. In addition, the rolling moments are so low that the drive of only one roller is sufficient.

Based on this prior art, the present invention seeks to further develop a known method and a known rolling stand for cold rolling of rolling material operable in a reducing or a temper rolling operation, that the quality of the rolling stock and the stability of the rolling conditions are improved in the temper rolling.

This object is achieved by the method claimed in claim 1. This method is characterized in that the upper or the lower work roll is uncoupled from its drive device in the temper rolling operation. Neither the upper nor the lower support roller are driven in the temper rolling operation according to the invention.

The term "or" is to be understood in the context of the present invention as an exclusive alternative. A simultaneous decoupling of both work rolls in the temper rolling operation, as known in the prior art, is expressly not meant and excluded from the scope of protection.

The introductory definitions of reducing operation and tempering operation apply - apart from the drive concept for the work rolls in the temper rolling operation - equally for the subject matter of the present invention. In contrast, the claimed drive concept applies to the drive of the work rolls in the skin pass mill.

The claimed method provides that the rolling stand can be operated as an alternative to the temper rolling in a mode of operation reducing operation for significantly reducing the thickness of the rolling stock. Such a combi-scaffold, which allows for the ironing of ferrous and non-ferrous metals and the reduction of ferrous metal and non-ferrous metal on a scaffold, offers distinct advantages, especially in financial terms compared to two separate scaffolds; H. a Reduziergerüst and a separate skin pass mill.

Smallest diameter differences in the two work rolls, as they are z. B. by grinding errors or different thermal expansion and led to speed differences in the two work rolls are advantageously avoided by the claimed drive concept, in which the two work rolls are rotationally coupled to each other in the temper rolling on rolling stock together. Even moments-trim, chattering, surface defects and / or unstable rolling conditions, as they typically arise in a positive coupling of both work rolls to the comb roller gear, are advantageously avoided by the claimed drive of only one of the two work rolls. Overall, the quality of the rolling stock is improved and the rolling conditions stabilized by the claimed drive concept in the temper rolling. Thus, the claimed method is particularly suitable for casting non-ferrous metal strip.

According to a first embodiment of the method according to the invention the upper support roller is lifted from the upper work roll or - if present - from the upper intermediate roll in the tempering and it takes the application and adjustment of the rolling force by the action of the upper bending cylinder on the upper work roll or - if present - on the upper intermediate roller.

The power flow in the rolling stand and the characteristics of the components are essential for the elastic behavior of the roll stand. Games and lots should therefore be avoided, as a free movement of the very heavy components would cause damage within a short time. Therefore, all joints between moving components, such. B. between stacked bearing housings, ie chocks, adjacent rolls using hydraulic adjustment balanced, ie biased. A back-up roll can weigh up to 200 t. This corresponds to a necessary balancing force of 2 MN. This corresponds to the same size as the required rolling force in the temper rolling operation. If then additionally an employment of the support rollers would be provided on the adjusting cylinder, the rolling force acting on the rolling stock would very quickly exceed the lower tempering required in the temper rolling. Also, the (lesser) temper rolling forces would no longer be able to be controlled cleanly, because the weight of the back-up roll alone is of the same order of magnitude.

Therefore, the lifting of the upper backup roll from the upper work roll or from the upper intermediate roll provided according to the first embodiment avoids the described problem of excessive rolling force when the backup roll rests.

Any side effects of lifting the backup roll, such as a possible change in the nip profile are remedied by the application and adjustment of the rolling force by the action of the upper bending cylinder on the upper work roll or, if present, on the upper intermediate roll, as claimed.

In principle, in the context of the present invention, during the tempering operation, the upper support roller may also rest on the upper work roll or on the upper intermediate roll; then, however, the said disadvantages persist in the fine adjustment of the tempering forces.

According to a further embodiment, the method according to the invention provides that in the temper rolling operation the thickness of the rolling stock is regulated with the aid of a skin pass control loop to a predetermined constant nominal thickness, e.g. by suitable variation of the strip tension of the rolling stock or the rolling speed as manipulated variables. The skin level control, d. H. Thickness control during skin pass requires that the rolling force must be kept constant in order to obtain a uniform impression of the roughness of the temper rolling on the strip. It should be possible no thickness jumps occur. For this purpose, the method according to the invention advantageously provides for a regulation of the rolling force applied to the rolling stock with the aid of a rolling force control loop, the bending cylinders serving as actuators for the rolling force. Preferably, alternatively or additionally, a position control loop is provided in order to keep the setting position of the work rolls constant.

Both the rolling force control and the position control must be done in real time if possible, which is why the step responses of the two control loops preferably last less than 80 ms.

According to a further embodiment, the method according to the invention provides that, optionally, a flatness control loop can also be provided for regulating the flatness of the rolling stock. The flatness control loop then comprises a flatness measuring device, z. B. a flatness measuring roller at the output of the rolling stand for detecting the actual flatness of the rolling stock. The actual flatness thus measured is compared with a predetermined desired flatness, i. H. the difference between these two flatnesses is formed and this difference is fed as a flatness control deviation to a flatness controller which, in accordance with the flatness control deviation, generates a suitable actuating signal for an actuator, for example the upper bending cylinder of the upper intermediate or work roll. In this way, the bending cylinders are controlled such that the flatness at the outlet of the rolling stand ideally corresponds to the predetermined desired flatness.

According to a further embodiment of the invention, the lubricant is circulated and prefiltered after its use and before its reuse or prior to its recirculation. During its prefiltering, the lubricant is freed of tinsel particles that may be produced during the temper rolling operation. The prefiltering is preferably carried out before a typically anyway carried out very fine filtering of the lubricant.

According to a further embodiment, it is provided that only a minimal amount of pure lubricant is used in the temper rolling operation. The minimum amount is ideally such a small amount that is completely consumed during the temper rolling in the nip, so that in the outlet of the rolling stand ideally no lubricant remains on the surface of the rolling and no lubricant runs off the side of the rolling stock. This minimal quantity lubrication basically takes place alternatively to the recycling of the lubricant, as described in the previous paragraph. If, in the reality of minimal quantity lubrication, small residual amounts of lubricant nevertheless remain on the rolling stock, these residual quantities can, of course, still be circulated and reused after prefiltering.

The inventive method is provided for non-ferrous metal strip or ferrous metal strip as a rolling stock. When tempering non-ferrous metal strip as rolling stock, rolling oil is preferably used as lubricant, taking advantage of its lubricant function. in principle However, rolling oil can be used in all modes of operation, that is both for reducing non-ferrous metal strip or ferrous metal strip, as well as for tempering non-ferrous metal strip or ferrous metal strip.

In the temper rolling operation according to the present invention, temper rolling rolls, typically with a certain surface roughness, are used as work rolls. These temper rolling are advantageously cleaned during the breaks of the tempering operation by a high-pressure spray with the lubricant or with the aid of brushes. The cleaning process has the advantage that the service life of the temper rolling specially roughened for the temper rolling is increased.

The above object is further achieved by a rolling stand according to claim 11. This solution is characterized in that the torque transmission device has at least one coupling device and an associated control device for uncoupling the upper or the lower work roll from the at least one drive device during the tempering operation. The advantages of this solution correspond to the advantages mentioned above with reference to the method described.

Further advantageous embodiments of the method and the rolling mill according to the invention are the subject of the dependent claims.

The description is a total of three figures attached, where

1 an inventively designed four-roll mill stand;

2 an inventively designed six-high rolling stand; and

3 the inventive method for adjusting a Reduzierbetriebs or temper rolling on a combination mill
shows.

The invention will be described in detail below with reference to the said figures in the form of exemplary embodiments. In all figures, the same technical elements are designated by the same reference numerals.

1 shows a four-roll mill 100 , Specifically, the rolling mill comprises an upper work roll 120-1 , a lower stripper 120-2 and an upper support roller 110-1 and a lower back-up roll 110-2 , The work rolls are arranged between the two support rolls. The two work rolls clamp a rolling gap in rolling operation 128 to cold-roll rolling stock passed between them.

On the inlet side of the rolling stand are at the level of the upper and lower work rolls 120-1 . 120-2 spray 195 arranged to apply coolant and lubricant to the work rolls. The rolling stand 100 assigned is a thickness control loop 150 , a rolling-load control loop 160 , a position control loop 170 and / or a flatness control loop 180 ,

Furthermore, the rolling stand 100 associated with a lubrication and coolant circuit, which comprises means for collecting the running of the rollers coolant or lubricant, for filtering the used coolant and lubricant and for returning the cleaned coolant or lubricant to in particular the work rolls. The recycling is typically done with a circulation system 192 , The cleaning or filtering of the coolant and / or lubricant typically takes place in a very fine filter 194 , According to the invention, however, this ultrafine filter additionally has a pre-filter 190 upstream, for filtering out baubles from the coolant or lubricant, as obtained during the rolling of rolling stock. This pre-filter 190 can, as in 1 shown, either in front of or behind a circulation system 192 be arranged; In any case, it is in the flow direction before the finest filter 194 arranged.

As an alternative to the just described circulation of the lubricant, it is also possible to carry out minimum quantity lubrication, in which only so much lubricant is applied to the rolling stock and / or to the work rolls on the inlet side, as is actually consumed or required during rolling in the roll gap.

The drive of the work rolls 120-1 . 120-2 takes place by at least one drive device 124 . 124-1 . 124-2 with the interposition of a torque transmission device 120 ' . 120 '' ,

In a first embodiment, as in 1 is shown, the torque transmission device 120 ' an upper coupling device 126-1 , an upper drive spindle 122-1 and optionally an upper transmission gear for transmitting a torque from the upper drive means 124-1 on the upper stripper 120-1 , Here is the upper drive spindle 122-1 between the upper work roll and the upper drive means 124-1 and the optional transmission gear 129-1 disposed between the upper drive spindle and the upper drive means. The upper coupling device 126-1 can between the upper work roll and the upper drive spindle and / or be arranged between the upper drive spindle and the upper transmission gear and / or between the upper transmission gear and the upper drive means, and / or it is designed as an idle position of the upper transmission gear.

Furthermore, the torque transmission device 120 ' according to its first embodiment, a lower coupling device 126-2 , a lower drive spindle 122-2 and optionally a lower transmission gear 129-2 for transmitting a torque from the lower drive means 124-2 on the lower stripper 120-2 , Here is the lower drive spindle 122-2 between the lower work roll and the lower drive means 124-2 and the optional lower gearbox 129-2 disposed between the lower drive spindle and the lower drive means. The lower coupling device 126-2 may be disposed between the lower work roll and the lower drive spindle and / or between the lower drive spindle and the lower transmission gear and / or between the lower transmission gear and the lower drive means, and / or it is formed as an idle position of the lower transmission gear.

In 1 For example, the upper clutch device is shown in an open, that is, decoupled state, while the lower clutch device is shown in a closed, ie, coupled state. The torque flow from the drive devices 124 . 124-1 . 124-2 to the work rolls can be selectively interrupted by means of the coupling devices. Possible are positive, frictional, magnetic or fluid-dynamic action principles in the coupling device. The actuation of the switchable coupling device can be mechanical, electrical, electromagnetic, pneumatic or in any other construction. The arrangement of the switchable coupling device can take place on or in the comb-rolling gear, within the spindle, or on the roll neck.

This in 1 shown four-roll rolling stand 100 can be operated in a mode of operation temper rolling; the associated configuration of the rolling stand 100 is in 1 illustrated schematically. The two support rollers 110-1 . 110-2 are not driven in the tempering operation.

In 1 are still upper bending cylinder 140 to recognize which on the drive side AS and on the operating side BS on the upper work roll 120-1 Act. When rolling is in the nip 128 located and the two bending cylinders 140 in each case a half bending force F / 2 on the upper work roll 120-1 exercise, this action of the bending force causes a negative bending of the upper work roll.

In the tempering operation is initially the upper support roller 110-1 from the upper stripper 120-1 lifted. This has the advantage that on the rolling stock in the nip 128 acting rolling force, as far as it is determined by the weight of the overlying rollers, is significantly lower when lifted upper backup roller than if the upper support roller would rest on the upper work roll and thus on the rolling stock. The significantly lower rolling force in the tempering operation compared to a reduction operation is expressly desired in the tempering operation, because in the casting operation not the reduction in thickness but only the imparting of a predetermined by the work rolls in the form of temper rolling surface roughness structure on the surface of the rolling stock is in the foreground.

In addition to the weight of the upper work roll 120-1 the rolling force applied to the rolling stock in the temper rolling operation is additionally determined by that of the two bending cylinders 140 on the operating side BS and the drive side AS of the rolling stand each half additionally applied bending force defined. With the help of the bending cylinder, it is possible to define an operating point for the total rolling force acting on the rolling stock and this rolling force, if desired, with the aid of the associated rolling force control loop 160 Keep constant or correct at a predetermined constant rolling force setpoint. When the bending cylinder 140 used in this way for the precise adjustment of the rolling force, this is also referred to as extended bending system.

A special feature of the temper rolling operation according to the invention is furthermore that none of the two support rolls 110-1 . 110-2 and only one of the two work rolls 120-1 . 120-2 is driven. In 1 this is an example of the lower work roll 120-2 , It is over the closed lower coupling device 126-2 and the lower drive shaft 122-2 and optionally via the transmission gear 129-2 to the lower drive device 124-2 docked while the upper work roll 120-2 over the opened upper coupling device 126-1 from the upper drive device assigned to it 124-1 disconnected.

As already mentioned, the thickness reduction of the rolling stock is significantly lower in the temper rolling operation than in a reducing operation. Nevertheless, a thickness control can also take place during a tempering operation; it is then typically referred to as a skin level control and by means of a skin pass control loop 150 carried out. The skin pass control circuit regulates the reduction in thickness of the rolling stock during the tempering operation to a specified constant desired thickness by suitable variation of the strip tension of the rolling stock or by suitable variation of the rolling speed. The strip tension or the rolling speed serve as manipulated variables in the case of the skin pass control.

As an alternative or in addition to the above-described rolling-force control circuit, the rolling mill can be provided with a position-regulating loop 170 be assigned to keep constant the pitch of the work rolls. This can be measured either directly or indirectly by evaluating the positions of the bending cylinders 140 be detected and controlled by the bending cylinder as actuators. Both the control of the rolling force as well as the regulation of the position of the work rolls are preferably carried out in real time. For this purpose, the corresponding control circuits must be correspondingly fast; Preferably, their step responses are shorter than 80 ms.

In addition, the rolling stand, a flatness control loop 180 be assigned to control the flatness of the rolling stock. The flatness control loop 180 includes a measuring element 197 , For example, a flatness measuring roller for detecting the rolling stock at the output of the rolling stand for local detection of the actual flatness of the rolling stock. This measured actual flatness of the rolling stock is compared by subtraction compared to a predetermined target flatness and the resulting difference in the flatness deviation is evaluated by a planarity, which in accordance with the flatness control deviation, a control signal to the actuators, eg the upper negative-acting bending cylinder 140 , outputs for controlling the flatness on the predetermined target flatness.

In the tempering operation only a minimal amount of lubricant is used. That is, it is used only as much lubricant as is actually consumed or needed in the nip; Ideally, especially during the tempering operation, no lubricant runs off the side of the rolling stock and ideally no lubricant remains on the rolling stock after passing through the rolling gap.

The rolling stand is designed for either cold rolling of ferrous metal strip or non-ferrous metal strip. When cold rolling non-ferrous metal strip so-called rolling oil or a water-oil mixture is used as a cooling lubricant.

The rolling stand is designed as a combination rolling stand, which can be operated either in a Reduzierbetriebsmodus or in a skin pass mode.

2 shows in contrast to 1 a six-high rolling stand. This is different from the one in 1 shown four-roll mill by an upper intermediate roll 130-1 , which is disposed between the upper work roll and the upper backup roll, and a lower intermediate roll 130-2 which is disposed between the lower work roll and the lower backup roll. 2 shows the operation of this six-high rolling stand in the skin pass mode in which the upper back-up roll 110-1 from the upper intermediate roll 130-1 is lifted off. The upper bending cylinder 140 Do not work on the upper work roll 120-1 but on the upper intermediate roller 130-1 , Otherwise, the structure of the roll stand and the operation or operation of the roll stand in the temper rolling correspond to the above with reference to 1 described information.

2 shows a second embodiment of the torque transmission device 120 '' , According to this second embodiment, the torque transmission device 120 '' in addition to the coupling device 126 an upper and a lower drive spindle 122-1 . 122-2 as well as a comb roller gearbox 129 to transmit a torque from the single drive means 124 on at least one of the work rolls 120-1 . 120-2 , The comb gear is at its torque input with the only drive means 124 connected. The upper drive spindle 122-1 is between the upper work roll and the upper torque output of Kammwalzgetriebes, the lower drive spindle 122-2 is between the lower work roll and the lower torque output of Kammwalzgetriebes and the Kammwalzgetriebe 129 is between the upper and lower drive spindle and the drive device 124 arranged. The coupling device 126 may be arranged between the upper work roll and the upper drive spindle and / or between the upper drive spindle and the comb-roller gear and / or between the lower work roll and the lower drive spindle and / or between the lower drive spindle and the comb-rolling gear or it is formed as a neutral position of the Kammwalzgetriebes ,

The torque transmission device 120 ' according to its first embodiment, not only as in 1 shown to be operated in conjunction with a four-high stand, but also in conjunction with a six-high stand. The torque transmission device 120 '' According to its second embodiment, not only as in FIG 2 shown to be operated in conjunction with a six-high stand, but also in conjunction with a four-high stand.

In both embodiments of the torque transmission device 120 ' . 120 '' the clutch devices is a control device 127 assigned. The control device makes it possible to open or close the coupling devices, depending on the operation of the roll stand, either in the operating mode of reducing operation or in the operating mode of skin pass operation.

3 Fig. 11 finally shows the necessary process steps for selecting either the reduce mode of operation or the skin pass mode in a combination mill which can alternatively run both modes of operation.

When selecting the reduction mode, the framework parameters are first set to reduction mode. This means, in particular, that the technological control loops, such as the thickness control loop, are essential for the rolling force and position detection of the jobs, as well as the flatness control loop, for which the available actuators are essential, are parameterized accordingly. The technological control loops are activated both in skin pass mode and in reduction mode, but possibly parameterized differently.

In the reducing mode, the thickness control typically takes the form of a monitor or mass flow control. All rollers are integrated in the power flow. The adjustment of the rolling force and the position of the work rolls takes place in Reduzierbetrieb on the Anstellzylinder, which act on the upper resting on the upper intermediate roll or the upper work roll support roller. If intermediate rolls are present, they are in contact with the work rolls. Accordingly, these adjusting cylinders are to be addressed in reducing operation as actuators in said control circuits.

In Reduzierbetrieb both work rolls on the torque transmission device 120 ' . 120 '' from the at least one drive device 124 . 124-1 . 124-2 rotatably driven. As work rolls, rolls with a smooth surface are typically selected in the reduction mode. After performing all said steps, the mill stand is then substantially ready for rolling.

If, alternatively, the operating mode of skin pass mode is selected, one of the two work rolls within the torque transmission device according to the invention will be used 120 ' . 120 ' uncoupled from the drive means by means of the coupling means while the other working roll remains coupled. Subsequently, it is then checked whether the expected rolling force in the tempering operation is greater than a predetermined rolling force threshold F_Grenz or not. If this is not the case, the upper support roller is lifted from the upper work roll or from the upper intermediate roll.

The rolling force and the position control loop are configured such that the upper bending cylinder as actuators 140 be controlled. Thickness control in skin pass mode is typically done as a skin level control. If the rolling force to be set in the temper rolling operation is greater than the predetermined threshold value, the upper backup roll is placed on the upper work roll or the upper intermediate roll.

Finally, all framework parameters, in particular all target values for the control circuits activated in the skin pass mode, are set to suitable target values in skin pass mode. In the temper rolling operation, the setting of the framework parameters takes place in order to ensure the concrete penetration of the bending systems and the framework rigidity parameters required for the thickness control.

These parameters differ considerably, depending on the selected operating mode, but also in the selected application of the upper support roller.

As work rolls, special temper rolling rolls with a predetermined surface roughness are typically used in the temper rolling operation. In the tempering operation, a minimum quantity lubrication or alternatively a lubricant circulation with the prefilter 190 be provided to filter out the abrasion (tinsel) in the temper rolling from the lubricant and thus to relieve the main filter. After performing the said steps, the rolling stand is then ready for rolling in the temper rolling operation.

The combination rolling mill according to the invention is designed to be converted from the Reduzierkonfiguration in the temperament configuration and vice versa. Specifically, in particular, the upper back-up roll may optionally be placed on and off the upper work roll, the upper and lower work rolls may be uncoupled and uncoupled to the drive means and the smooth reduction work rolls must be against the roughened skin-pass mill rolls be exchangeable. Optionally, the pre-filter for filtering baubles in the skin pass mode can also be removable when changing over to reduction operation, since this prefilter is typically dispensable in the reduction mode.

LIST OF REFERENCE NUMBERS

100

 rolling mill

110-1

 upper support roller

110-1

 lower support roller

120 '

 Torque transmission device according to the first embodiment

120 ''

 Torque transmission device according to the second embodiment

120-1

 upper stripper

120-2

 lower stripper

122-1

 Upper drive spindle for upper work roll

122-2

 lower drive spindle for lower work roll

124

 (only) drive device for combed roller gear

124-1

 upper drive device for upper work roll

124-2

 lower drive device for lower work roll

126

 Coupling device when using comb-driven gear

126-1

 upper coupling device

126-2

 lower coupling device

127

 control device

128

 nip

129

 Pinion gear

129-1

 upper transmission gear

129-2

 lower transmission gear

130-1

 upper intermediate roller

130-2

 lower intermediate roll

140

 bending cylinders

150

 Dick loop

160

 Rolling force control loop

170

 Position loop

180

 Flatness control loop

190

 prefilter

192

 circulation system

194

 microfilter

195

spray

197

 measuring element

200

 rolling

AS

 driving side

BS

 operating side

F

 bending force

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• EP 1318879 B1 [0002]
• DE 4417274 C2 [0002]
• EP 1420898 [0002]
• DE 4417274 [0002]
• DE 19744503 A1 [0002]
• EP 1173295 [0002]
• DE 102004025058 [0002]
• EP 1399277 [0002]
• DE 1020070324857 [0002]
• WO 2008/071277 [0002]
• JP 620688613A [0002]

Cited non-patent literature

• Selzer, H., Developments in the Cold Rolling Division, Cold Rolling Symposium, SMS Siemag AG, Hilchenbach-Dahlbruch, DE, 16-17.02.2000 [0002]

Claims (18)

Method for operating a rolling stand ( 100 ) for cold rolling of rolling stock ( 200 ), wherein the roll stand at least an upper and a lower support roll ( 110-1 . 110-2 ) and an upper and a lower work roll ( 120-1 . 120-2 ), which has a roll gap ( 128 ), and optionally also an upper and lower intermediate roll ( 130-1 . 130-2 ), and wherein the rolling stand optionally in a mode of operation reducing operation for reducing the thickness of the rolling stock ( 200 ) or can be operated in a mode of operation temper rolling; characterized in that in the tempering operation the upper or the lower work roll ( 120-1 . 120-2 ) from its drive device ( 124 . 124-1 . 124-2 ) is decoupled. A method according to claim 1, characterized in that for the temper rolling the upper support roller ( 110-1 ) from the upper work roll ( 120-1 ) or, if present, from the upper intermediate roll ( 130-1 ) is lifted; and that the application and adjustment of a rolling force (F) by the action of upper bending cylinders ( 140 ) on the upper work roll ( 120-1 ) or, if present, on the upper intermediate roll ( 130-1 ) he follows. A method according to claim 2, characterized in that in the temper rolling the thickness of the rolling stock ( 200 ) by means of a skin pass control loop ( 150 ) is controlled to a predetermined constant target thickness, by suitable variation of the strip tension of the rolling stock or the rolling speed as manipulated variables. A method according to claim 3, characterized in that the of the bending cylinders ( 140 ) to the rolling stock ( 200 ) applied bending force (F) by means of a rolling force control circuit ( 160 ) and / or preferably also the setting position of the work rolls ( 120-1 . 120-2 ) by means of a position control loop ( 170 ) is kept constant. Method according to one of claims 2 to 4, characterized in that the flatness of the rolling stock with the aid of a flatness control loop ( 180 ) is controlled by measuring the actual flatness at the exit of the mill stand and suitable action on actuators in accordance with a flatness control deviation as the difference between a predetermined desired flatness and the measured actual flatness. Method according to one of the preceding claims, characterized in that the lubricant is pre-filtered after its use and before its reuse. Method according to one of the preceding claims, characterized in that only a minimal amount of pure lubricant is used in the tempering. Method according to one of the preceding claims, characterized in that it is in the rolling stock ( 200 ) is non-ferrous metal strip or ferrous metal strip. A method according to claim 8, characterized in that during the casting of non-ferrous metal strip as rolled rolling oil is used as a lubricant. Method according to one of the preceding claims, characterized in that temper rolling in the temper rolling operation with a surface roughening as working rolls ( 120-1 . 1202 ) be used; and that preferably the temper rolling rollers are cleaned in the breaks of the tempering operation by high-pressure spraying with the lubricant and / or with the aid of brushes. Rolling stand ( 100 ) for cold rolling of rolling stock, comprising: an upper and a lower support roll ( 110-1 . 110-2 ); an upper and a lower work roll ( 120-1 . 120-2 ), which are mounted between the support rollers and a roll gap ( 128 ) span; optionally also an upper and lower intermediate roller ( 130-1 . 130-2 ), which are stored between the working and support rollers; at least one drive device ( 124 . 124-1 . 124-2 ) for driving the work rolls; and a torque transmission device ( 120 ' . 120 '' ) for transmitting a torque from the at least one drive means to the work rolls, the stand being formed as a combined reduction and temper rolling mill with the alternative operating modes of reducing operation for reducing the thickness of the rolling stock or temper rolling operation; characterized in that the torque transmission device ( 120 ' . 120 '' ) at least one coupling device ( 126 . 126-1 . 126-2 ) and an associated control device ( 127 ) for uncoupling the upper or the lower work roll from the at least one drive device ( 124 . 124-1 . 124-2 ) during the tempering operation. Rolling stand ( 100 ) according to claim 11, characterized in that the drive means in the form of an upper drive means ( 124-1 ) is provided for driving the upper work roll; and the torque transmission device ( 120 ' ) the coupling device in the form of an upper coupling device ( 126-1 ), an upper drive spindle ( 122-1 ) and optionally an upper transmission gear ( 129-1 ) for transmitting a torque from the upper drive device ( 124-1 ) on the upper work roll ( 120-1 ), wherein the upper drive spindle ( 122-1 ) between the upper work roll and the upper drive device ( 124-1 ) and the optional transmission gear ( 129-1 ) is disposed between the upper drive spindle and the upper drive means; and wherein the upper coupling device ( 126-1 ) between the upper work roll and the upper drive spindle and / or between the upper drive spindle and the upper transmission gear and / or between the upper transmission gear and the upper drive means is arranged and / or idle position of the upper transmission gear ( 129-1 ) is trained. Rolling stand ( 100 ) according to claim 12, characterized in that the drive means next to the upper drive means ( 124-1 ) also a lower drive device ( 124-2 ) for driving the lower work roll ( 120-2 ); and the torque transmission device ( 120 ' ) further comprises a lower coupling device ( 126-1 ), a lower drive spindle ( 122-2 ) and optionally a lower transmission gear ( 129-2 ) for transmitting a torque from the lower drive means ( 124-2 ) on the lower work roll ( 120-2 ), wherein the lower drive spindle ( 122-2 ) between the lower work roll and the lower drive device ( 124-2 ) and the optional lower transmission gear ( 129-2 ) is disposed between the lower drive spindle and the lower drive means; and wherein the lower coupling device ( 126-2 ) between the lower work roll and the lower drive spindle and / or between the lower drive spindle and the lower transmission gear ( 129-2 ) and / or between the lower transmission gear and the lower drive device ( 124-2 ) is arranged and / or is designed as an idle position of the lower transmission gear. 1 roll stand according to claim 11, characterized in that the torque transmission device ( 120 '' ) next to the coupling device ( 126 ) an upper and a lower drive spindle ( 122-1 . 122-2 ) as well as a comb roller gear ( 129 ) for transmitting a torque from the drive device ( 124 ) on at least one of the work rolls ( 120-1 . 120-2 ), wherein the comb-type gearbox at its torque input with the single drive device ( 124 ) connected is; the upper drive spindle ( 122-1 ) between the upper work roll and the upper torque output of the Kammwalzgetriebes, the lower drive spindle ( 122-2 ) between the lower work roll and the lower torque output of the Kammwalzgetriebes and the comb-roller transmission between the drive spindles ( 122-1 . 122-2 ) and the drive device ( 124 ) is arranged; and wherein the coupling device ( 126 ) between the upper work roll and the upper drive spindle and / or between the upper drive spindle and the upper torque output of the Kammwalzgetriebes and / or between the lower work roll and the lower drive spindle and / or between the lower drive spindle and the lower torque output of Kammrefergetriebes is arranged and / / or is designed as an idle position of Kammwalzgetriebes. Rolling stand ( 100 ) according to one of claims 11 to 14, characterized by at least upper bending cylinders ( 140 ) for applying and setting a rolling force (F) in the roll gap ( 128 ) by acting on the upper work roll ( 120-1 ) or, if present, on the upper intermediate roll ( 130-1 ). Rolling stand ( 100 ) according to one of claims 11 to 15, characterized in that the rolling stand ( 100 ) a skin pass control loop ( 150 ) for controlling the thickness of the rolling stock in the operating mode of skin pass mode, a rolling force control loop ( 160 ) for holding the rolling force during the tempering operation, a position control loop ( 170 ) and / or a flatness control loop ( 180 ) to ensure the flatness of the rolling stock. Rolling stand ( 100 ) according to one of claims 11 to 16, characterized in that the rolling stand ( 100 ) is adapted to be operated according to the method of any one of claims 1 to 10. Rolling stand ( 100 ) according to any one of claims 11-17, characterized by a spray bar ( 195 ) for rolling oil in the inlet of the roll stand for the casting of non-ferrous metal strip as a rolling stock.

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