EP3060358B2 - Aluminium-warmbandwalzstrasse und verfahren zum warmwalzen eines aluminium-warmbandes - Google Patents

Aluminium-warmbandwalzstrasse und verfahren zum warmwalzen eines aluminium-warmbandes Download PDF

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Publication number
EP3060358B2
EP3060358B2 EP14766186.2A EP14766186A EP3060358B2 EP 3060358 B2 EP3060358 B2 EP 3060358B2 EP 14766186 A EP14766186 A EP 14766186A EP 3060358 B2 EP3060358 B2 EP 3060358B2
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Prior art keywords
strip
rolling
hot
aluminium
cooling
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EP14766186.2A
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German (de)
English (en)
French (fr)
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EP3060358B1 (de
EP3060358A1 (de
Inventor
Michael Breuer
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SMS Group GmbH
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SMS Group GmbH
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    • 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
    • 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
    • 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
    • B21B2001/225—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 by hot-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
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0021—Cutting or shearing the product in the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • 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

Definitions

  • the invention relates to an aluminum hot strip rolling mill comprising a multi-stand tandem finishing mill with at least one coiler downstream in the rolling direction and at least one associated cooling section. Furthermore, the invention is directed to a method for hot rolling an aluminum hot strip made of an AlMgSi alloy of the AA6xxx group in an aluminum hot strip rolling mill and a method for hot rolling an aluminum hot strip made of an AlMg alloy of the AA5xxx group in an aluminum hot strip rolling mill. Finally, the invention is directed to the use of an aluminum hot strip produced according to one of the methods.
  • the tandem rolling mills used today for hot rolling of aluminum alloys are universal rolling mills on which all rollable qualities of aluminum alloys of the groups AA1xxx, AA2xxx, AA3xxx, AA5xxx, AA6xxx, AA7xxx, and AA8xxx (aluminum alloys according to DIN EN 573-3 and DIN EN 573-4) can be rolled and produced with the desired final dimensions.
  • These aluminum tandem hot rolling mills are designed to be compact with a stand distance of between 4 m and 6 m. With larger stand distances, the risk increases that the strip will no longer run into the next stand centrally due to sideways drift. With smaller distances, the equipment required for rolling, such as tension measuring rolls and transfer tables, are no longer accessible, e.g.
  • these compact tandem rolling mills can be used to process all grades of aluminium, including those where achieving a coiling temperature of over 300°C requires very high rolling speeds and/or greater final thicknesses due to their low forming strength and thus low absorption of forming heat.
  • the final rolling temperature is set by regulating the rolling speed.
  • the coiling temperature corresponds to the final rolling temperature reduced by the cooling of a few Kelvin between the last stand and the coiling device caused by free convection. It is not possible to specifically influence the temperature-time path in the tandem rolling mill and/or to independently set the final rolling and coiling temperatures.
  • An aluminium hot strip rolling mill is also available from DE 20 2011 050 449 U1
  • This document discloses an aluminum hot strip rolling mill with a two-part tandem finishing mill, with a cooling section being formed between the two parts of the tandem finishing mill.
  • This cooling section is more effective than a cooling section arranged in the entry area of a tandem finishing mill, since the aluminum hot strip thickness is lower after passing through part of the tandem stands and a lower hot strip temperature may have been established when this cooling section is reached compared to the entry temperature.
  • this system makes it possible to carry out greater thickness reductions in the first tandem finishing stands than in rolling mills with a cooling section in the entry area, since the temperature increase that occurs during the greater deformation can be cooled down again by the cooling section before entering the second part of the tandem finishing mill.
  • the disadvantage of this plant configuration is that the large distance between the stands requires more installation space and the production process becomes unstable due to the risk of the strip running sideways during threading and unthreading. Furthermore, for qualities where no cooling is required, such as soft A1xxx or A3xxx qualities, the process control is very limited in terms of temperature control. Especially for the qualities mentioned, it is advantageous to achieve a coiling temperature above 300°C in order to achieve recrystallization processes in the coil and thus reduce the power and labor required in the subsequent cold rolling process. The large distance between the two tandem finishing mill sections leads to an unwanted, uncontrollable temperature reduction.
  • a generic aluminum hot strip rolling mill is from the DE10349950 A1
  • tandem finishing mill known from the state of the art
  • the invention is therefore based on the object of creating a solution which makes it possible to set cooling curves and temperature-time paths in the rolled stock in an improved manner during aluminum hot strip rolling in a tandem finishing mill.
  • a solution is also to be created that makes it possible to avoid or reduce the previously necessary rest phases of the material before further processing or finishing, to shorten the production time and thus increase the output while at the same time having a compact design due to the small stand spacing, as well as separate setting of the rolling and coiling temperatures.
  • the task is solved by an aluminum hot strip rolling mill according to claim 1.
  • the invention makes it possible to respond in a variety of ways to the cooling process of the aluminum alloy rolled in a tandem finishing mill and then coiled or the aluminum hot strip made of this alloy. This is supported by the use of at least one trimming shear.
  • a trimming shear is located in the exit area of the tandem rolling mills. This is advantageous for removing the irregular hot strip edges that arise due to the process and can contain cracks, and thus creating a uniform strip edge. These shears are adjustable and remove approx. 2 to 150 mm of the strip edge. With the strip edges defined in this way, precautions to take into account the temperature gradients at the strip edge resulting from the rolling process can be omitted. Possible unevenness in the area of the strip edges, which would usually be exacerbated by cooling, can thus be avoided. Furthermore, the width-dependent adjustment of the cooling device is possible in a simple manner thanks to the reliable knowledge of the trimmed strip width.
  • Inter-stand cooling in the sense of the invention is understood to mean a cooling device arranged between two rolling stands of the tandem rolling mill. These can, for example, apply a coolant quantity of about 500 l/min to 15,000 l/min to the strip. These large quantities are necessary in order to achieve suitable cooling in the strip.
  • a cooling section in the sense of the invention is understood to mean a cooling device arranged between the last rolling stand of the tandem rolling mill and the coiler device. This can apply a coolant quantity of about 2000 l/min to 50,000 l/min to the strip. These large quantities are necessary in order to achieve suitable cooling in the strip.
  • the inter-stand cooling it is possible to specifically set the temperatures during forming and the final rolling temperature.
  • the cooling section arranged at the exit of the aluminum hot strip rolling mill and in particular at the exit of the multi-stand tandem finishing mill, it is also possible to specifically set the coiling temperature.
  • the final rolling temperature is understood to be the temperature at which the aluminum hot strip emerges from the tandem finishing mill during the last rolling pass and the coiling temperature is understood to be the temperature at which the rolled aluminum hot strip is rolled or wound onto the coiler.
  • the coiling temperature can be set to a temperature in the range of below 200 °C to below 250 °C depending on the material in order to prevent or significantly slow down the course of diffusion processes and thus prevent the formation of coarse precipitations due to diffusion processes during coiling or when cooling the aluminum hot strip on the coiling reel.
  • the precise, alloy-dependent setting of the coiling temperature is essential in that a temperature is set at which diffusion processes no longer take place or only take place at a much slower rate.
  • a strip dryer is arranged in the rolling direction behind the cooling section and in front of the coiler, which comprises a drying device and/or cooling medium discharge devices. Since the aluminum hot-rolled strip can no longer dry completely using its own heat due to the low aluminum strip temperatures that arise during operation of the cooling section, the installation of a strip dryer behind the cooling section and in front of the coiler is advantageous.
  • this is further characterized in that the cooling section and the inter-stand cooling are designed as laminar belt cooling or as spray cooling.
  • This advantageously makes it possible to achieve good cooling results in the temperature range of approx. 300 °C and lower temperatures, in which range transition boiling occurs at higher temperatures and nucleate boiling occurs at lower temperatures.
  • This range is characterized by a particularly strong temperature-dependent change in the heat transfer coefficient, the value of which increases sharply from a value set at approx. 300 °C up to a temperature of approx. 250 °C and then drops sharply again to the range of approx. 200 °C.
  • the aluminum hot strip rolling mill has a control and/or regulating device which controls the rolling stands and the cooling section as well as the at least one inter-stand cooling system independently of one another and adapts the rolling speed, the inter-stand cooling, the final rolling temperature and the coiler temperature to the respective aluminum hot strip material and in particular sets and regulates them independently of one another.
  • Rolling emulsions or demineralized water have a particularly advantageous cooling effect on the hot aluminum strip, so that the invention further provides that the cooling section and the inter-stand cooling systems are supplied with a rolling emulsion or demineralized water as a cooling medium.
  • the aluminum hot strip rolling mill according to the invention is also characterized by the fact that a pre-strip cooler is arranged in the entry area of the tandem finishing mill. This makes it possible to specifically exert a cooling effect on the aluminum hot strip entering the tandem finishing mill.
  • the invention is therefore further characterized in that a process model is stored and mapped in the control and/or regulating device, which takes into account the changes in the heat transfer coefficient during the cooling of the aluminum hot strip and which is integrated into the control and/or regulating processes of the aluminum hot strip rolling mill, in particular the tandem finishing mill with pre-strip cooler and/or inter-stand cooling and/or cooling section and/or strip drying.
  • a process model is stored and mapped in the control and/or regulating device, which takes into account the effect of the respective temperature level of the hot aluminum strip during the individual passes in the stands of the tandem finishing rolling mill on the friction between the respective rolls and the respective hot aluminum strip material and which is integrated into the control and/or regulating processes of the hot aluminum strip rolling mill, in particular the tandem finishing rolling mill with pre-strip cooler and/or inter-stand cooling and/or cooling section and/or strip drying, which the invention also provides.
  • the various independently controllable and activatable devices of the at least one cooling section the inter-stand cooling and, if applicable, the pre-strip cooling, to specifically set cooling curves in the sense of special, desired temperature-time paths in the aluminum hot strip production depending on the alloy, independently of one another and also independently of the rolling speed(s) set in each case and also independently of the cooling, which can also be controlled independently of the cooling.
  • HT qualities alloys that can be hardened by heat treatment
  • particularly finely distributed precipitates with favorable mechanical properties of the end products can be produced.
  • NHT qualities non-hardenable alloys
  • the temperature range of the last forming step i.e.
  • the last pass in the tandem finishing rolling mill can be reduced without any loss in production output to such an extent that cold forming in the material without recrystallization remains during the subsequent coiling and cooling of the coil produced on the coiler, whereby the strength of such an aluminum hot strip can be significantly increased compared to that produced using the state of the art.
  • H2 or even H3 qualities can be produced for AA5xxx alloys in this way, without the otherwise necessary additional step of cold rolling.
  • T4 and T6 refer to the keys for heat treatment according to DIN EN 515.
  • the short rolling time per strip element of less than 60 s enables a reduction in the recrystallization process between the last passes of the rolling process.
  • This method can be carried out particularly expediently in an aluminum hot strip rolling mill.
  • the method according to the invention is therefore further characterized in that it is carried out in an aluminum hot strip rolling mill according to one of claims 1-3.
  • the invention enables the advantageous use of the produced hot-rolled aluminum strips in components of a chassis or structural part or of a sheet used in motor vehicle, aircraft or rail vehicle construction, in particular as a component, chassis part, outer or inner sheet in motor vehicle construction, preferably as a bodywork component.
  • the Figure 1 shows the tandem finishing mill area of an aluminum hot strip rolling mill according to the invention with a multi-stand tandem finishing mill 2 comprising four tandem stands 1, a pre-strip cooler 3 in the entry area of the tandem finishing mill 2 and an associated cooling section 4 in the exit area of the aluminum hot strip rolling mill.
  • Intermediate stand cooling systems 5 are arranged between the individual tandem rolling stands 1.
  • a trimming shear 6 In the rolling direction behind the tandem finishing mill 2 and in front of the cooling section 4 there is a trimming shear 6 and in the rolling direction behind the cooling section 4 and in front of a coiler 8 that receives the rolled aluminum hot strip 7 there is a strip dryer 9.
  • measuring devices or measuring equipment 10 with which the strip temperature(s), strip speed(s), strip surface(s) or the like can be recorded.
  • These measuring instruments or measuring devices 10 are in operative connection with a Fig.6 schematically illustrated control and/or regulating device 11, with which the tandem rolling stands 1, in particular the rolling speed, the cooling section 4 and the inter-stand cooling systems 5 and, if desired, the pre-strip cooling system 3 and the strip drying system 9 can be controlled and regulated independently of one another.
  • the independent control and regulation of the individual cooling devices consists, for example, in the fact that activation or deactivation as well as the cooling medium mass flow delivered to the aluminum hot strip 7 from the pre-strip cooler 3, but in particular the inter-stand cooling systems 5 and the cooling section 4, can take place independently of one another and independently of the control of the rolling speed.
  • the strip dryer 9 arranged in front of the winding reel 8 makes it possible to remove any cooling medium still present on the surface of the hot aluminum strip 7 after it has passed through the cooling section 4, thus preventing surface defects.
  • the cooling section 4 and the intermediate cooling systems 5 are designed as laminar strip cooling or as spray cooling.
  • the preferred cooling medium is a (standard) rolling emulsion or demineralized water.
  • the belt dryer 9 has drying devices and cooling medium discharge devices in the form of a catcher with counter-spray 12, a counter-spray 13, so-called air knives 14 and an extraction system 15.
  • Fig.3 It can be seen that existing aluminum hot strip rolling mills can also be easily retrofitted with the cooling option according to the invention, for which it is only necessary to extend the run-out area if necessary and to move an initially existing coiler 8' to the position of the coiler 8 so that space is created for the cooling section 4 and the strip dryer 9, or to provide the coiler 8 in addition to the coiler 8'.
  • the intermediate cooling systems 5 are retrofitted between the tandem stands 1 of the tandem finishing mill 2 and, if desired, the pre-strip cooler 3 is arranged on the inlet side.
  • an aluminum hot strip 7 after rough rolling in the roughing mill of the aluminum hot strip rolling mill can, with the roughing strip cooler 3, the inter-stand cooling 5 and the cooling section 4 activated, initially be rolled out significantly more quickly to the final rolling temperature in the range between 300 °C and 360 °C and then cooled to the coiling temperature in the range of ⁇ 200 °C to ⁇ 250 °C before the aluminum hot strip 7 is wound onto the winding coiler 8 and left there for further cooling.
  • Fig.5 the effect of the intermediate cooling 5 in the four-stand tandem finishing mill 2 is shown again, whereby the activation and the effect of the cooling section 4 in the run-out area on the temperature-time path before the aluminum hot strip 7 is wound onto the coiler 8 and cooled in the coil is omitted.
  • the course of the cooling curve or the temperature-time path without intermediate stand cooling is shown as a solid line and the cooling curve or the temperature-time path with activated inter-stand cooling is shown as a dashed line.
  • the Fig.6 shows schematically the control and/or regulating device 11, to which the measured values determined with the measuring devices or measuring devices 10, which represent the rolling result and the state of the rolling process, are reported back or fed back (feedback). These measured values then also flow into the technological process model 16 stored in the control and/or regulating device 11.
  • This technological process model 16 stored and displayed in the control and/or regulating device 11 is constructed in such a way that it takes into account the changes in the heat transfer coefficient during the cooling of the aluminum hot strip 7 and integrates them into the control and/or regulating processes.
  • the technological process model 16 also takes into account the effect of the respective temperature level of the hot aluminum strip 7 during the individual passes in the tandem stands 1 of the tandem finishing mill 2 on the friction between the rolling emulsion or the respective rolls and the respective hot aluminum strip material and incorporates this into the control and/or regulation processes.
  • Fig.6 the technological process model 16 influences the presetting (setup) of the individual devices of the aluminum hot strip rolling mill and in particular the area of the tandem finishing mill 2 shown here with pre-strip cooler 3, intermediate cooling 5 and associated cooling section 4 as well as the strip dryer 9 by generating control and/or regulation signals which are then transmitted to the respective devices, such as tandem stands 1, pre-strip cooler 3, cooling section 4, intermediate cooling 5 and strip dryer 9, by means of the control and/or regulation device 11.
  • Part of the control and/or regulation device 11 is a process computer (not shown in detail), in which the technological process model 16 is stored and which controls the setting of the desired temperature-time paths and the regulation device.
  • the cooling devices 3, 4 and 5 can be designed in such a way that they can be regulated depending on the width in relation to the rolled aluminum hot strip 7.
  • the aluminum hot strip rolling mill according to the invention makes it possible to set and run individual, special and possibly alloy-dependent time paths in relation to the temperature and/or the forming rates set in the tandem stands 1 in order to obtain a desired result in each case with regard to the structure established in the respective aluminum alloy of the rolled aluminum hot strip and the material properties and/or strength determined thereby. It is therefore possible to control the forming, the (cooling) time and the temperature independently of one another on the aluminum hot strip rolling mill according to the invention without any loss of production. In fact, it is even possible to increase production in relation to comparable finishing rolling mills according to the state of the art. For each aluminum alloy that can be used, conditions can be set such that the precipitations are finely distributed in the rolled product.
  • the formation of large precipitates can be prevented by rapidly cooling the hot-rolled aluminum strip 7 after hot forming in a temperature range of ⁇ 200 °C to ⁇ 250 °C, in which diffusion processes do not occur or only occur at a much slower rate.
  • the inter-stand cooling systems 5 can be used particularly advantageously when recrystallization only occurs partially or no longer at relatively low temperatures and the activation energy for recrystallization in the coiled coil on the winding reel 8 can thus be accumulated by the remaining deformation energy.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP14766186.2A 2013-10-25 2014-09-16 Aluminium-warmbandwalzstrasse und verfahren zum warmwalzen eines aluminium-warmbandes Active EP3060358B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310221710 DE102013221710A1 (de) 2013-10-25 2013-10-25 Aluminium-Warmbandwalzstraße und Verfahren zum Warmwalzen eines Aluminium-Warmbandes
PCT/EP2014/069724 WO2015058902A1 (de) 2013-10-25 2014-09-16 ALUMINIUM-WARMBANDWALZSTRAßE UND VERFAHREN ZUM WARMWALZEN EINES ALUMINIUM-WARMBANDES

Publications (3)

Publication Number Publication Date
EP3060358A1 EP3060358A1 (de) 2016-08-31
EP3060358B1 EP3060358B1 (de) 2017-11-15
EP3060358B2 true EP3060358B2 (de) 2024-04-17

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EP14766186.2A Active EP3060358B2 (de) 2013-10-25 2014-09-16 Aluminium-warmbandwalzstrasse und verfahren zum warmwalzen eines aluminium-warmbandes

Country Status (9)

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US (1) US10384248B2 (es)
EP (1) EP3060358B2 (es)
JP (1) JP2016533901A (es)
KR (1) KR20160072231A (es)
CN (1) CN105848797B (es)
DE (1) DE102013221710A1 (es)
MX (1) MX368535B (es)
WO (1) WO2015058902A1 (es)
ZA (1) ZA201602660B (es)

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EP3434383A1 (de) 2017-07-24 2019-01-30 Primetals Technologies Austria GmbH Gerüstkühler zum abkühlen eines stahlbands in einem walzgerüst
CN108941398A (zh) * 2018-08-06 2018-12-07 安徽雅静新能源科技有限公司 环卫清扫车盘刷内圈自动成型装置及自动成型方法
CN110369776B (zh) * 2019-07-25 2024-07-09 中冶赛迪技术研究中心有限公司 热轧带钢连接剪切压接装置同步摆动机构
US12128463B2 (en) 2020-06-04 2024-10-29 Constellium Neuf-Brisach Method and equipment for cooling on a reversing hot rolling mill
FR3112297B1 (fr) * 2020-07-07 2024-02-09 Constellium Neuf Brisach Procédé et équipement de refroidissement sur un Laminoir réversible à chaud
CN113510162B (zh) * 2021-07-24 2023-05-12 鞍钢冷轧钢板（莆田）有限公司 一种冷轧带钢制造生产收卷方法
CN118002618A (zh) * 2024-01-31 2024-05-10 北京弥天科技有限公司 一种铝合金带的热轧方法

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US10384248B2 (en) 2019-08-20
EP3060358A1 (de) 2016-08-31
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CN105848797B (zh) 2018-09-11
DE102013221710A1 (de) 2015-04-30
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