EP4028181B1 - Laminage à froid de produit dans un train de laminoirs à multiples cages de laminoir - Google Patents

Laminage à froid de produit dans un train de laminoirs à multiples cages de laminoir Download PDF

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Publication number
EP4028181B1
EP4028181B1 EP20768550.4A EP20768550A EP4028181B1 EP 4028181 B1 EP4028181 B1 EP 4028181B1 EP 20768550 A EP20768550 A EP 20768550A EP 4028181 B1 EP4028181 B1 EP 4028181B1
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EP
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Prior art keywords
rolling
stock
loop
rolled
pass
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German (de)
English (en)
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EP4028181C0 (fr
EP4028181A1 (fr
Inventor
Martin Bergmann
Konrad Krimpelstaetter
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Primetals Technologies Austria GmbH
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Primetals Technologies Austria GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/36—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/46—Roll speed or drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling

Definitions

  • the invention relates to the cold rolling of a rolling stock in a rolling train with a plurality of roll stands.
  • a rolling stock In a roll stand, a rolling stock, usually a metallic rolled strip, is rolled in a roll gap between two work rolls of the roll stand in order to reduce the thickness of the rolling stock.
  • a plurality of roll stands are often arranged in a so-called rolling train, through which the rolling stock passes in succession in order to successively reduce the thickness of the rolling stock.
  • the rolling of the rolling stock in one of the roll stands is referred to as a rolling pass.
  • several rolling passes are carried out one after the other.
  • the reduction in the thickness of the rolling stock in a rolling pass is referred to as reduction of the rolling pass.
  • the rolling stock is rolled at a rolling stock temperature below the recrystallization temperature.
  • the rolling stock temperature during cold rolling must not exceed the recrystallization temperature of the rolling stock due to the principle involved.
  • the rolling stock temperature during cold rolling should generally also be limited for other reasons.
  • a lubricant is applied to the work rolls of the roll stands and/or to the rolled stock to reduce friction between the rolled stock and the work rolls.
  • the lubricant is or contains a rolling oil that can crack at high temperatures, for example above 200°C.
  • the cold rolling can be followed by processing steps for processing the cold-rolled rolling stock, for example coating the rolling stock, for which an excessively high rolling stock temperature is disadvantageous (in the case of coating the rolling stock, for example, reduced adhesion of the coating).
  • a high rolling stock temperature can lead to increased wear of plant equipment, for example plastic-coated deflection rollers for the rolling stock or deposit saddles for the rolled stock, or to thermal deformation of the work roll contour in the axial direction, which impairs the flatness of the rolling stock.
  • the JP H01 218710 A proposes heating a rolled strip entering a cold rolling stand to a temperature between 100°C - 500°C and applying lubricant to the work rolls of the rolling stand on the entry side and water as a coolant on the exit side.
  • the heating is intended to reduce the deformation resistance of the rolled strip
  • the application of cooling water is intended to prevent destruction of the lubricating film on the work rolls due to overheating and excessive thermal deformation of the work rolls.
  • the invention is based on the object of specifying a method and a rolling train for cold-rolling a rolling stock with a plurality of roll stands, which are improved with regard to the tempering of the rolling stock during rolling and/or after rolling.
  • the object is achieved according to the invention by a method having the features of claim 1 and a rolling train having the features of claim 12.
  • the invention therefore provides for the rolling stock temperature to be monitored in at least one pass so that it does not exceed a pass-specific upper limit temperature and/or does not fall below a pass-specific lower limit temperature.
  • breakdowns such as strip tears can generally be reduced and the throughput of a rolling train can thus be increased.
  • the production conditions for the cold rolling of critical rolling stock such as electrical steel sheets with a high silicon content, are being improved or even created in the first place.
  • the limit temperatures the final temperature of the rolling stock at the exit of the rolling train can be specifically influenced, as a result of which flexible further processing of the cold-rolled rolling stock can be achieved.
  • an inlet temperature of the rolling stock that is required at the entrance to the rolling train can be minimized, thereby saving energy for heating the rolling stock before the first rolling pass.
  • the system equipment can be protected by a suitable specification of the limit temperatures in order to reduce its wear.
  • control or regulation measures mentioned are particularly suitable for influencing the rolling stock temperature during cold rolling. For example, heating the rolled stock before the first rolling pass reduces the brittleness of the rolled stock and thus the risk of strip tears in the rolled stock.
  • Cooling work rolls and/or the rolling stock between rolling passes counteracts heating of the work rolls and the rolling stock during cold forming of the rolling stock.
  • the amount of heat removed from the work rolls can be determined from the modeling of the heat transfer (determination of the heat transfer coefficient between a roll surface and the roll coolant) and is, for example out of F. Hell: Fundamentals of heat transfer, VDI-Verlag 1982, ISBN number 978-3-18-400529-0, pages 77-85 known.
  • the heat transfer coefficient can also be determined empirically as a function of the roll coolant flow and the roll coolant pressure (so-called table model).
  • the temperature of the work rolls can be determined, from which in turn the heat flow between the rolling stock and the work rolls - i.e. the amount of heat given off by the rolling stock to the work rolls - in the roll gap can be determined and regulated by appropriate control or regulation of the roll coolant flow and/or the roll coolant pressure , so that the rolling stock temperature in the roll gap can be set in a targeted manner.
  • the amount of heat removed from the rolling stock to the rolling stock coolant can be determined by modeling the heat transfer, if the flow of rolling stock coolant and the rolling stock coolant pressure are known, either by a model-based determination mentioned above as an example, or by an empirical determination of the heat transfer coefficient between the rolling stock coolant and the surface of the rolling stock to which it acts as a function of the rolling stock coolant flow and the rolling stock coolant pressure.
  • Applying a lubricant to the work rolls and/or to the rolling stock during at least one rolling pass reduces the friction between the rolling stock and the work rolls and thus counteracts heating of the rolling stock and/or the work rolls.
  • the more lubricant applied the lower the frictional power loss during rolling.
  • Latter is basically calculated from an applied rolling force, a coefficient of friction and a difference in speed between the rolled strip and the work rolls in the roll gap of the respective roll stand.
  • the rolling force is usually specified by a system automation of the rolling train to achieve the desired pass reduction on the relevant stand and is therefore known.
  • the current rolling force for example in the case of thickness control, can also be continuously measured online via devices that generate the rolling force on the roll stand in question (e.g. hydraulic cylinders).
  • the reduction in thickness of the rolling stock to be achieved in the rolling train is divided between the individual rolling stands by means of a pass plan distribution for the pass reductions of the individual rolling passes.
  • the rolling stock is heated in each roll stand by the plastic deformation of the rolling stock.
  • the heat of deformation occurring in the rolling stock can be determined by a person skilled in the art in a simple manner from the pass reduction at the respective roll stand and from the material properties of the rolling stock.
  • all stands of the rolling train taken into account it can be achieved, for example, that a predetermined temperature range for the rolling stock temperature is maintained over the entire rolling train.
  • the rolling speed is a speed at which the rolling stock runs through the roll stands of the rolling train.
  • the rolling speed can directly influence the above-mentioned friction losses at the individual roll stands, since the differential speeds in the individual roll stands are also directly affected by the rolling speed.
  • the rolling speed therefore also influences the rolling stock temperature in the individual rolling passes.
  • These manipulated variables include the heat output of a heating device for setting an inlet temperature of the rolled strip before the first rolling pass, the cooling parameters for setting the amount of heat that is dissipated from the rolling stock through the contact of the rolling stock with the work rolls and through the rolling stock coolant applied to the rolling stock, the lubrication parameters for setting the friction power loss in the roll gap of the respective roll stands, the pass plan distribution for setting the forming heat generated during pass reduction in the respective roll stands, and the rolling speed, which also influences the friction power loss during pass reduction in the individual roll stands.
  • the resulting rolling stock temperatures can be determined, for example, using a simulation by a computing unit in advance, i.e. before the rolling process itself is actually carried out.
  • This computing unit can be identical to the controller that carries out the control or regulation measures on the rolling train in the real rolling process.
  • the resulting temperature of the rolling stock downstream of the first rolling stand after application of the rolling stock coolant can be determined, starting from an inlet temperature of the rolling stock that is preset by means of a heating device or otherwise determined.
  • the temperature of the rolling stock determined in this way behind the first roll stand can be used as a starting point to calculate the temperature of the rolling stock behind the second roll stand on the basis of the temperature on the second roll stand in the same way preset rolling speed, pass reduction as well to determine cooling and lubrication parameters.
  • This successive determination of the rolling stock temperature can be continued until the rolling stock emerges from the last roll stand of the rolling train.
  • one of the above-mentioned control or regulation measures can be applied with values that deviate from the preset values for the respective manipulated variable and the rolling stock temperature can be calculated again to check whether the specified limit temperatures are maintained with changed parameters for the control or regulation measures. The check can be carried out again after each change in the set manipulated variables.
  • the lubrication applied and/or the cooling on this stand can be increased in order to reduce the frictional power loss and/or increase the amount of heat removed from the rolling stock.
  • a solution is sought in which several criteria are to be taken into account simultaneously with the specification of a target function, with the target function weighting the individual criteria individually and these criteria, for example, a desired temperature control across the entire rolling mill, an optimized pass schedule in With regard to desired material properties, the highest possible throughput rate through the rolling train, compliance with a specific rolling force distribution or the lowest possible use of coolants and lubricants.
  • the computing effort to find a solution to a global optimization problem increases disproportionately with the number of variable parameters.
  • the independent and non-inventive execution of one or more of the above control or regulation measures does not necessarily provide the optimal solution in relation to such a global optimization problem, but an independent implementation of the execution of one or more of the above control or regulation measures is different from each other, for example as Retrofitting solution for existing control systems of rolling mills, since the verification of whether an applied control or regulation measure ensures compliance with the limit temperatures is in any case only proportional to the roll stands of the rolling mill, but does not depend on the number of variable parameters themselves.
  • the computing power required in such a case can therefore also be provided by a controller of the rolling train itself. For example, when changing the cooling parameters on a specific roll stand, only the rolling stock temperatures in the region of the roll stand downstream of the roll stand in question have to be redetermined.
  • a model-based calculation of the entry temperature of the rolling stock, the cooling and lubrication parameters, the pass schedule distribution and the rolling speed takes place as a solution to a global optimization problem with the specification of a target function.
  • a global optimization problem there can be a large number of solutions, among which the most suitable one is determined, for example, only after taking into account other criteria, for example by additionally maximizing the rolling speed or maintaining a specific rolling force distribution on the roll stands 3 to 7, also based on a model.
  • an upper limit temperature in the range between 140° C. and 250° C. and/or a lower limit temperature in the range between 20° C. and 140° C. is specified for at least one rolling pass.
  • Such an upper limit temperature can in particular prevent the aforementioned cracking of rolling oil that is used as a lubricant or a component of a lubricant.
  • the lower limit temperature depends on the material and is therefore adapted to the rolling stock.
  • a common upper limit temperature and/or a common lower limit temperature are specified for all rolling passes. This simplifies the method according to the invention compared to an embodiment with limit temperatures dependent on the rolling pass.
  • the rolling stock is heated to an entry temperature before the first rolling pass with a heating device, in particular with an induction heater.
  • a heating device in particular with an induction heater.
  • the heating of the rolling stock can be determined simply from the power of the induction heating, the efficiency and the exposure time, which results from the rolling stock speed and the overall length of the heating, as well as material properties of the rolling stock, in particular its specific thermal capacity.
  • the work rolls of at least one roll stand are cooled by applying a roll coolant to the work rolls only on the outlet side.
  • the exit side of a roll stand is understood to mean that side of the roll stand on which the rolling stock leaves the roll stand.
  • the entry side of a roll stand is understood to mean that side of the roll stand on which the rolling stock enters the roll stand.
  • a lubricant is applied to the work rolls and/or to the rolling stock in at least one pass by producing a mixture of the lubricant and a carrier gas in an atomization device and spraying the mixture onto the work rolls and/or onto lubricant nozzles the rolling stock is sprayed.
  • Such an application of lubricant is, for example, from EP 2 651 577 B1 known and has the advantage over the application of a lubricating emulsion, for example, that the lubricant can be applied very precisely and sparingly.
  • a lubricant is only applied to the work rolls and/or to the rolling stock in at least one rolling pass on the inlet side. This is particularly advantageous in the case of rolling passes in which coolant is only applied on the outlet side, because then no lubricant is washed off the coolant and lubricant is thus saved.
  • a parameter value is determined offline for at least one parameter of a control or regulation measure using a calculation model of at least part of the rolling mill and the parameter is set to the parameter value during operation of the rolling mill.
  • the parameters that can be determined by a computational model include an inlet temperature of the rolling stock, cooling parameters (e.g. roll coolant flows, roll coolant pressures, rolling stock coolant flows and rolling stock coolant pressures), lubrication parameters (e.g. lubricant flows and lubricant pressures), a pass schedule distribution (i.e. the Pass reductions of the individual rolling passes), as well as a rolling speed.
  • At least a subset of the parameters for controlling or regulating the rolling stock temperature is determined (in particular calculated) in advance.
  • At least two parameter values determined offline are determined as a solution to a global optimization problem with specification of a target function.
  • this advantageously allows at least one further criterion to be taken into account during the rolling process of the rolling stock.
  • At least one measured value of the temperature of the rolling stock is recorded during operation of the rolling train, and at least one parameter of a control or regulation measure is set online as a function of at least one measured value.
  • at least a subset of the parameters for controlling or regulating the rolling stock temperature is set online as a function of a measured rolling stock temperature of the rolling stock. This can particularly affect the cooling and lubrication of the work rolls and/or the rolling stock.
  • FIG 1 shows schematically an exemplary embodiment of a rolling train 1 according to the invention with five roll stands 3 to 7 for cold rolling a rolling stock 2.
  • Each roll stand 3 to 7 has two work rolls 9, 10 arranged one above the other, which are spaced apart from one another by a roll gap 11.
  • the work rolls 9, 10 are set in rotation by a motor and the rolled stock 3 is pulled by the rotating work rolls 9, 10 in a rolling direction 13 through the roll gaps 11.
  • each roll stand 3 to 7 for each Work roll 9, 10 has two back-up rolls 15 to 18, which are arranged one above the other on a side of the respective work roll 9, 10 facing away from the rolling stock 2, with a first back-up roll 15, 17 contacting the second back-up roll 16, 18 and the work roll 9, 10 .
  • Each roll stand 3 to 7 carries out a rolling pass in which the thickness of the rolling stock 2 is reduced by the so-called pass reduction of the rolling pass.
  • a heating device 19 is arranged at the entrance to the rolling train 1 and is set up to heat the rolling stock 2 before the first rolling pass, which is carried out by a first roll stand 3 .
  • the heating device 19 is designed, for example, as an induction heater with which the rolling stock 3 can be inductively heated.
  • the rolling train 1 also has a cooling system which is set up to apply a roll coolant 21 to the work rolls 9, 10 of the roll stands 4 to 6 which carry out the second, third and fourth pass, and a roll coolant 23 between the second and the third pass, output the third and the fourth rolling pass and the fourth and the fifth rolling pass on the rolling stock 2.
  • the cooling system comprises an upper cooling beam 25 and a lower cooling beam 27 for each of the roll stands 4 to 6. With the upper cooling beam 25, roll coolant 21 is on the outlet side on the upper work roll 9 of the respective roll stand 4 to 6 and rolling stock coolant 23 on an upper rolling stock surface of the rolling stock 3 spendable.
  • each cooling bar 25, 27 comprises, for example, a plurality of roll coolant nozzles, with which the roll coolant 21 can be discharged onto the respective work roll 9, 10, and/or a plurality of rolling stock coolant nozzles which the rolling stock coolant 23 can be dispensed onto the rolling stock 2.
  • the roll coolant 21 is, for example, water or a cooling emulsion.
  • the rolling stock coolant 23 is also water or a cooling emulsion, for example, and can agree with the roll coolant 21 .
  • a cooling emulsion consists of a cooling liquid and a lubricant, for example water as the cooling liquid and oil as the lubricant, and possibly emulsifiers.
  • the main component of the cooling emulsion is the cooling liquid, while the lubricant content of the cooling emulsion is only a few percent, for example two to three percent.
  • the amount of roll coolant 21 applied to the two work rolls 9, 10 of a roll stand 4 to 6 (in total, i.e. to both work rolls 9, 10 together) in liters per minute corresponds approximately to a motor power of the roll stand 4 to 6 in kW, with the Motor power is the power of a motor driving the work rolls 9, 10 of the roll stand 4 to 6.
  • the rolling train 1 also has a lubrication system which is set up to dispense a lubricant 29 onto the work rolls 9, 10 of all roll stands 3 to 7 on the inlet side.
  • the lubrication system has an upper lubricating bar 31 and a lower lubricating bar 33 for each roll stand 3 to 7 .
  • Lubricant 29 can be dispensed with the upper lubricating bar 31 on the inlet side onto the upper work roll 9 of the respective roll stand 3 to 7 .
  • With the lower lubricating bar 33 lubricant 29 can be dispensed onto the lower work roll 10 of the respective roll stand 3 to 7 on the inlet side.
  • each lubricating bar 31, 33 includes an atomization device in which a mixture of the lubricant 29 and a carrier gas can be generated, and a plurality of lubricant nozzles with which the mixture can be sprayed onto the respective work roll 9, 10.
  • the lubricant 29 is, for example, pure rolling oil and the carrier gas is air, for example.
  • the carrier gas is air, for example.
  • a maximum of two liters of rolling oil are dispensed onto each work roll 9, 10 per minute.
  • the lubricant 29 is a lubricating emulsion consisting of a carrier liquid and rolling oil and possibly emulsifiers, and each lubricating bar 31, 33 has lubricant nozzles with which the lubricating emulsion can be dispensed onto the respective work roll 9, 10.
  • collecting devices 35 Arranged under the roll stands 3 to 7 are collecting devices 35 which are set up to collect roll coolant 21 , rolling stock coolant 23 and lubricant 29 flowing out of the roll stands 3 to 7 .
  • the mixture of roll coolant 21, rolling stock coolant 23 and lubricant 29 collected by the collecting devices 35 is preferably broken down into its components, which are then reused.
  • the rolling train 1 also has a number of measuring units 37 which are each set up to record a rolling stock temperature of the rolling stock 2 .
  • a measuring unit 37 is arranged between the heating device 19 and the first rolling stand 3, further measuring units 37 are arranged respectively between two adjacent rolling stands 3 to 7, and a measuring unit 37 is at the end of the rolling train 1 behind the rolling stand 7 which carries out the fifth rolling pass. arranged.
  • the rolling train 1 also has a controller 39 with which the heating device 19, the cooling system, i.e. the roll coolant flows, roll coolant pressures, rolling stock coolant flows and rolling stock coolant pressures emitted by the cooling beams 25, 27, and the lubrication system, i.e. those from the lubricating beams 31, 33 lubricant flows and lubricant pressures that are output in each case can be controlled or regulated in order to control or regulate the rolling stock temperature of the rolling stock 2 in each rolling pass.
  • the cooling system i.e. the roll coolant flows
  • roll coolant pressures rolling stock coolant flows and rolling stock coolant pressures emitted by the cooling beams 25, 27,
  • the lubrication system i.e. those from the lubricating beams 31, 33 lubricant flows and lubricant pressures that are output in each case can be controlled or regulated in order to control or regulate the rolling stock temperature of the rolling stock 2 in each rolling pass.
  • a temperature window for the rolling stock temperature between a upper limit temperature and a lower limit temperature are specified, and the rolling stock temperature is controlled and/or regulated in such a way that the rolling stock temperature in each rolling pass assumes a temperature value lying in the temperature window specified for the rolling pass.
  • a pass plan distribution for the pass reductions of the individual rolling passes is created and implemented.
  • the roll stands 3 to 7, that is, the gap heights of the roll gaps 11 of the roll stands 3 to 7 are set according to the pass schedule distribution.
  • a rolling speed at which the rolling stock 2 runs through the rolling train 1 is controlled or regulated in order to influence the temperature of the rolling stock in the rolling passes. The rolling speed is adjusted by the speeds of the work rolls 9,10.
  • the parameters of the temperature control and/or regulation are an inlet temperature of the rolling stock 2 to be set with the heating device 19, the roll coolant flows output by the cooling beams 25, 27, roll coolant pressures, rolling stock coolant flows and rolling stock coolant pressures (cooling parameters), which are output by the lubricating beams 31, 33 in each case Lubricant flows and lubricant pressures (lubrication parameters), the pass schedule distribution and the rolling speed.
  • These parameters are each determined, for example, offline using a computer model of at least part of the rolling train 1 . For example, a model-based calculation of the inlet temperature of the rolling stock 2, the cooling and lubrication parameters, the pass schedule distribution and the rolling speed is carried out as a solution to a global optimization problem with a target function being specified.
  • the most suitable one can only be found, for example, taking into account further criteria, for example by additionally maximizing the rolling speed or maintaining a specific rolling force distribution on the roll stands 3 to 7, is also determined based on the model.
  • the parameters determined in this way are each set manually or by the controller 39 .
  • some or all parameters can be regulated online depending on the measured values of the measuring units 37 such that the rolling stock temperature in each rolling pass assumes a temperature value within the temperature window specified for the rolling pass.
  • the pass schedule distribution, the entry temperature of the rolling stock 2 and the rolling speed are determined offline, while the cooling and lubrication parameters are controlled online depending on the measured values from the measuring units 37 .
  • FIG 2 shows a flowchart 100 of an exemplary embodiment of the method according to the invention for cold-rolling a rolling stock 2 in a rolling train 1 with method steps 101 to 106.
  • a temperature window for the rolling stock temperature of the rolling stock 2 in the rolling pass is specified for each rolling pass.
  • the offline parameters are determined using a computer model of at least part of the rolling train 1, for example the pass schedule distribution, the inlet temperature of the rolling stock 2 and the rolling speed.
  • a third method step 103 the cold rolling of the rolling stock 2 in the rolling mill train 1 is started with the offline parameters determined in the second method step 102 and predetermined initial values of the online parameters.
  • a rolling stock temperature of the rolling stock 2 is determined for each rolling pass.
  • the rolling stock temperature is recorded for a rolling pass with at least one measuring unit 37 or the rolling stock temperature in the rolling pass is calculated, for example, as described above, with a calculation of the heat flow between the rolling stock and the work rolls in the roll gap based on a modeling of the heat transfer and/or with a calculation of the deformation heat that occurs when the rolling stock is heated by the plastic deformation of the rolling stock.
  • a check is made as to whether the temperature of the rolling stock in each rolling pass assumes a temperature value within the temperature window specified for the rolling pass. If the check reveals that the temperature of the rolling stock in each rolling pass assumes a temperature value within the temperature window specified for the rolling pass, the fourth method step 104 is carried out again. Otherwise, a sixth method step 106 is carried out.
  • the value of at least one online parameter is changed in order to bring the rolling stock temperature into the specified temperature window in each rolling pass in which the rolling stock temperature is outside the temperature window specified for the rolling pass.

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  • Crystallography & Structural Chemistry (AREA)
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Claims (13)

  1. Procédé de laminage à froid d'un produit laminé (2) dans un train de laminage (1) comprenant plusieurs cages de laminoir (3 à 7) qui sont traversées de manière successive par le produit laminé (2), dans lequel
    - pour au moins une passe de laminage, une température limite supérieure et/ou une température limite inférieure est/sont prédéfinie(s) pour une température de produit laminé du produit laminé (2),
    - et la température de produit laminé est commandée et/ou régulée grâce aux actions de commande ou de régulation ci-dessous de telle manière que, pendant la au moins une passe de laminage, la température de produit laminé ne dépasse pas la température limite supérieure prédéfinie pour la passe de laminage et/ou ne descend pas en dessous de la température limite inférieure prédéfinie pour la passe de laminage :
    - chauffer le produit laminé (2) à une température d'entrée avant la première passe de laminage au moyen d'un dispositif de chauffage (19), dans lequel la puissance de chauffage du dispositif de chauffage (19) est ajustée,
    - refroidir les cylindres de travail (9, 10) d'au moins une cage de laminoir (3 à 7) par application d'un agent de refroidissement de cylindre (21) sur les cylindres de travail (9, 10), dans lequel un flux d'agent de refroidissement de cylindre et/ou une pression d'agent de refroidissement de cylindre de l'agent de refroidissement de cylindre (21) est/sont commandé(s) ou régulé(s), dans lequel la quantité de chaleur dissipée à partir des cylindres de travail (9, 10) lors du refroidissement des cylindres de travail (9, 10) et la quantité de chaleur transférée du produit laminé (2) vers les cylindres de travail (9, 10) sont déterminées,
    - refroidir le produit laminé (2) entre au moins deux passes de laminage consécutives par application d'un agent de refroidissement de produit laminé (23) sur le produit laminé (2), dans lequel un flux d'agent de refroidissement de produit laminé et/ou une pression d'agent de refroidissement de produit laminé de l'agent de refroidissement de produit laminé (23) est/sont commandé(s) ou régulé(s) et la quantité de chaleur dissipée à partir du produit laminé (2) vers l'agent de refroidissement de produit laminé (23) lors du refroidissement du produit laminé (2) est déterminée,
    - appliquer un lubrifiant (29) sur les cylindres de travail (9, 10) et/ou sur le produit laminé (2) lors d'au moins une passe de laminage, dans lequel un flux de lubrifiant et/ou une pression de lubrifiant du lubrifiant (29) est/sont commandé(s) ou régulé(s) et une puissance de perte par friction dans l'emprise de la cage de laminoir (3 à 7) respective est déterminée,
    - établir et convertir une répartition des plans de passes pour les réductions aux passes des différentes passes de laminage, dans lequel la chaleur de formage générée lors du formage plastique du produit laminé (2) est déterminée à partir des réductions aux passes au niveau de la cage de laminoir respective et à partir des propriétés matérielles du produit laminé (2), et
    - commander ou réguler une vitesse de laminage à laquelle le produit laminé (2) traverse le train de laminage (1), dans lequel la puissance de perte par friction générée dans la cage de laminage (3 à 7) respective est déterminée.
  2. Procédé selon la revendication 1, dans lequel une température limite supérieure située dans la plage comprise entre 140°C et 250°C est prédéfinie pour au moins une passe de laminage.
  3. Procédé selon la revendication 1 ou 2, dans lequel une température limite inférieure située dans la plage comprise entre 20°C et 140°C est prédéfinie pour au moins une passe de laminage.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel une température limite supérieure commune est prédéfinie pour toutes les passes de laminage.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel une température limite inférieure commune est prédéfinie pour toutes les passes de laminage.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel le dispositif de chauffage (19) est conçu pour être un chauffage par induction.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel un lubrifiant (29) est appliqué sur les cylindres de travail (9, 10) et/ou sur le produit laminé (2) lors d'au moins une passe de laminage, grâce à la production d'un mélange de lubrifiant (29) et d'un gaz porteur au sein d'un dispositif de pulvérisation et à la pulvérisation du mélange sur les cylindres de travail (9, 10) et/ou sur le produit laminé (2) grâce à des buses à lubrifiant.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel, pour au moins un paramètre d'une action de commande ou de régulation, une valeur de paramètre est déterminée hors ligne à l'aide d'un modèle de calcul d'au moins une partie du train de laminage (1) et le paramètre est ajusté à la valeur de paramètre lors du fonctionnement du train de laminage (1).
  9. Procédé selon la revendication 8, dans lequel au moins une valeur de paramètre déterminée hors ligne est une température d'entrée du produit laminé (2) et/ou un paramètre de refroidissement et/ou un paramètre de lubrification et/ou une répartition de plans de passe et/ou une vitesse de laminage.
  10. Procédé selon la revendication 8 ou 9, dans lequel au moins deux valeurs de paramètres déterminées hors ligne sont déterminées en tant que solution d'un problème d'optimisation global avec spécification d'une fonction cible.
  11. Procédé selon l'une quelconque des revendications précédentes, dans lequel, pendant le fonctionnement du train de laminage (1), au moins une valeur de mesure de la température de produit laminé est enregistrée et au moins un paramètre d'une action de commande ou de régulation est ajusté en ligne en fonction d'au moins une valeur de mesure.
  12. Train de laminage (1) avec plusieurs cages de laminoir (3 à 7) permettant de laminer à froid un produit laminé (2) et avec une commande (39), comprenant
    - un dispositif de chauffage (19) pouvant être commandé ou régulé par la commande (39) et conçu pour chauffer le produit laminé (2) avant la première passe de laminage,
    - un système de refroidissement pouvant être commandé ou régulé par la commande (39) et conçu pour fournir un agent de refroidissement de cylindre (21) sur les cylindres de travail (9, 10) d'au moins une cage de laminoir (3 à 7) et/ou un agent de refroidissement de produit laminé (23) sur le produit laminé (2) entre au moins deux passes de laminage consécutives, et
    - un système de lubrification pouvant être commandé ou régulé par la commande (39) et conçu pour fournir un lubrifiant (29) sur les cylindres de travail et/ou sur le produit laminé (2) lors d'au moins une passe de laminage,
    - dans lequel la commande (39) est conçue pour mettre en œuvre les actions de commande ou de régulation du procédé selon l'une quelconque des revendications précédentes.
  13. Train de laminage (1) selon la revendication 12, comprenant au moins une unité de mesure (37) conçue pour enregistrer une température de produit laminé du produit laminé (2) au niveau d'un emplacement quelconque du train de laminage (1).
EP20768550.4A 2019-09-10 2020-09-07 Laminage à froid de produit dans un train de laminoirs à multiples cages de laminoir Active EP4028181B1 (fr)

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EP19196307.3A EP3791971A1 (fr) 2019-09-10 2019-09-10 Laminage à froid d'un article à laminer dans un train de laminage pourvu d'une pluralité de cages de laminoir
PCT/EP2020/074901 WO2021048038A1 (fr) 2019-09-10 2020-09-07 Laminage à froid de produit laminé dans un train de laminoirs à multiples cages de laminoir

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EP4124398B1 (fr) * 2021-07-27 2024-04-10 Primetals Technologies Austria GmbH Procédé de détermination des propriétés mécaniques d'un produit laminé a l'aide d'un modèle hybride
CN115283444B (zh) * 2022-10-09 2022-12-20 江苏常宝钢管股份有限公司 一种连轧机轧辊冷却的方法
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EP3791971A1 (fr) 2021-03-17
JP7326594B2 (ja) 2023-08-15
CN114340809A (zh) 2022-04-12
EP4028181C0 (fr) 2023-09-06
EP4028181A1 (fr) 2022-07-20
US20220355356A1 (en) 2022-11-10
JP2022546871A (ja) 2022-11-09
WO2021048038A1 (fr) 2021-03-18
KR20220062010A (ko) 2022-05-13
US12103061B2 (en) 2024-10-01

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