Classifications

• • 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
  • 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
• • 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

Definitions

• the invention is directed to an aluminum hot strip rolling mill comprising a multi-stand tandem finishing train with at least one downstream in the rolling direction rewinder and at least one associated cooling section.
• the invention is directed to a method for hot rolling an aluminum hot strip 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 from an AlMg alloy of the AA5xxx group in an aluminum hot strip mill. hot strip rolling mill.
• the invention is directed to the use of an aluminum hot strip produced by one of the methods.
• tandem rolling mills used today for the hot rolling of aluminum alloys are universal rolling mills on which all rollable qualities of aluminum alloys of the groups AAl xxx, 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.
• an aluminum hot strip rolling mill which upstream of a multi-stand tandem finishing train has an associated cooling section, with the aim of running the incoming aluminum strip over its entire length at a constant temperature in the tandem finishing train to let. The then in the tandem finishing train adjusting temperature-time path and thus the cooling curve of the aluminum heating band are set and no longer adjustable or adjustable regardless of the result of the inlet side cooling.
• a generic aluminum hot strip rolling mill is also known from DE 20 201 1 050 449 U1. This document discloses an aluminum hot strip rolling mill having a two-part tandem finishing train, wherein a cooling section is formed between the two parts of the tandem finishing train.
• This cooling section is more effective than a cooling section arranged in the inlet region of a tandem finishing train, since after passing through part of the tandem stands, the aluminum hot strip thickness is lower and, if necessary, a lower hot strip temperature has been established on reaching this cooling section compared to the inlet temperature.
• this system it is possible with this system to carry out larger thickness decreases in the first tandem finishing stands than in rolling mills with cooling section in the inlet area, since the temperature increase due to the stronger deformation are cooled down again by the cooling section before entering the second part of the tandem finishing train can.
• the disadvantage of this system configuration is that due to the large required stand distance on the one hand more space is required and on the other hand, the production process is unstable due to the risk of sideways running of the tape during insertion and Ausfädeins and further for qualities in which no cooling is required , such as soft A1 xxx or A3xxx grades, the process control with respect to the temperature control is severely limited. Especially with the mentioned qualities, it is favorable to achieve a reel temperature above 300 ° C. in order to obtain recrystallization processes in the bundle and thus to reduce the force and work requirement in the subsequent cold rolling process. The large distance between the two Tandem Fertig piecesnwel leads here to an unwanted, uninfluenced temperature reduction.
• tandem finish rolling train known from the prior art, it is not possible to set targeted temperature guides in the tandem finishing train such that targeted to the cooling process of the aluminum hot strip on the passage through the tandem finishing train acted and thus on the respective temperature-dependent in the rolled aluminum hot strip running recrystallization processes and / or diffusion processes could be influenced.
• the invention is therefore based on the object to provide a solution that makes it possible to set cooling curves and temperature-time paths in the aluminum hot strip rolling in a tandem finishing mill in the rolling stock in an improved manner.
• this object is achieved in that the at least one cooling section arranged in the outlet region of the aluminum hot strip rolling mill and the tandem finishing train is assigned at least one downstream in the rolling direction Beklamschere.
• the invention also provides that between at least two rolling stands of the multi-stand tandem finishing train an interstand cooling is arranged.
• the invention By means of the invention, it is possible to respond in a variety of ways to the cooling process of the aluminum alloy rolled or subsequently coiled in a tandem finish rolling mill or of the aluminum hot-rolled strip consisting of this alloy.
• This is supported by the use of at least one trimming scissors.
• a trimming shear In the outlet area of the tandem rolling mills, a trimming shear can be arranged. This is advantageous in order to remove the irregular hot strip edges resulting from the process, which may be subject to cracks, and thus to produce a uniform strip edge.
• These scissors are adjustable and remove about 2 to 150 mm of the band edge. Precision can be eliminated by the band edges defined in this way in order to take into account the temperature gradients at the strip edge resulting from the rolling process. Possible unevenness in the area of the strip edges can thus be avoided, which would usually be enhanced by cooling.
• the width-dependent adjustment of the cooling device is possible in a simple manner by the reliable knowledge of the edged bandwidth.
• Intermediate cooling in the sense of the invention means a cooling device arranged between two rolling stands of the tandem rolling mill. These may e.g. Apply a coolant amount of about 500 l / min up to 15000 l / min on the belt. These large quantities are required to achieve proper cooling in the belt.
• a cooling device is arranged between the last rolling stand of the tandem rolling mill and the reel means understood. These can apply a coolant amount of about 2000 l / min up to 50,000 l / min to the belt. These large quantities are required to achieve proper cooling in the belt.
• the interstage cooling it is possible to set the temperatures during the forming process and the final rolling temperature.
• the cooling section arranged in the outlet of the aluminum hot strip rolling mill and in particular in the outlet of the multi-stand tandem finishing train, it is possible to set the reel temperature in a targeted manner.
• the finish rolling temperature is understood to mean the temperature at which the aluminum hot strip emerges from the tandem finishing train at the last pass and the reel temperature is the temperature at which the rolled aluminum hot strip is rolled up or wound up on the take-up reel.
• the lowering of the final rolling temperature to the range of 300 ° C to 370 ° C is achieved by the interstitial cooling, which make it possible to cool the aluminum hot strip targeted and / or cool out the heat-converted rolling work of the tandem stands of the finishing train from the federal government again. Thanks to the interstand cooling, a desired temperature can be set for each pass in the rolling direction behind each tandem stand of the tandem finishing train, so that the aluminum lap can be subjected to a larger number of passes at lower temperatures than in the prior art. This allows the production capacity of one with such a tandem finishing train equipped, in particular retrofitted, aluminum hot strip rolling mill increase.
• the retention of hydrous materials on the aluminum strip during winding on the rewinder results in corrosion attack and surface discoloration. Since aluminum strip is not pickled, these surface defects remain and also lead to loss of quality or waste, if this process is not counteracted with the aid of belt drying.
• the invention is therefore characterized in an advantageous embodiment in that in the rolling direction behind the cooling section and before the rewinder a belt drying is arranged, which comprises a drying device and / ordemediumabloom surpriseen. Since due to the adjusting itself by the cooling section during their operation low aluminum strip temperatures, the aluminum hot rolled strip can no longer completely dry by its own heat, the installation of a belt drying behind the cooling section and in front of the rewinder is advantageous.
• this is further characterized by the fact that the cooling section and the interstitial cooling are formed as a laminar band cooling or spray cooling.
• good cooling results in the temperature range of about 300 ° C and lower temperatures can be achieved in an advantageous manner, in which range at the higher temperatures, the transition boiling and adjust at the lower temperatures, the nucleate boiling.
• This range is characterized by a particularly strong temperature-dependent change in the heat transfer coefficient, whose value rises sharply from a value of about 300 ° C value up to a temperature of about 250 ° C and then into the range of about 200 ° C drops sharply again.
• the invention provides that the aluminum hot strip rolling mill has a control and / or regulating device, which the Roll stand and the cooling section and the at least one interstand cooling independently controls and the rolling speed, the interstand cooling, the Endwalztemperatur and the coiler temperature adapted to the respective aluminum hot strip material and in particular independently adjusts and regulates.
• a particularly advantageous cooling effect exert rolling emulsions or demineralized water on the aluminum hot strip, so that the invention further provides that the cooling section and the interstand cooling are applied with a rolling emulsion or demineralized water as the cooling medium.
• the aluminum hot strip rolling mill according to the invention is also advantageously distinguished by the fact that a pre-strip cooler is arranged in the inlet region of the tandem finishing train. As a result, it is possible to exert a cooling effect on the aluminum hot-rolled strip entering the tandem finishing train.
• the heat transfer coefficient as described above changes strongly depending on the temperature in the temperature range of the transition boiling and the bubbling, it is expedient to map this in a stored in the control and / or regulating device technical process model.
• the invention is therefore further characterized in that in the control and / or regulating device, a process model is stored and displayed, which takes into account the changes in the heat transfer coefficient during cooling of the aluminum hot strip and in the control and / or regulating operations of the aluminum hot strip rolling mill , in particular the tandem finishing train with Vorbandkühler and / or interstage cooling and / or cooling section and / or belt drying, is involved.
• a process model is stored and imaged in the control and / or regulating device, which influences the reaction of the respective temperature level of the aluminum hot strip during the individual Stitches in the stands of the tandem finishing train on the friction between the respective rollers and the respective aluminum hot strip material into account and the control and / or regulating operations of the aluminum hot strip rolling mill, in particular the tandem finishing train with Vorbandkühler and / or interstand cooling and / or cooling line and / or belt drying, is integrated, what the invention also provides.
• the various independently controllable and activatable devices of at least one cooling section the inter-frame cooling and possibly the Vorbandkühlung independently and independently of each set and also independently controlled by the cooling rolling speed (s) Cooling curves in the sense of special, desired temperature-time paths in the aluminum hot bar production alloy-dependent targeted set.
• the temperature range of the last forming, ie the last pass in the tandem finishing train can be reduced without loss of production output to such an extent that cold deformation in the material without recrystallization in the subsequent coiling and the cooling of the resulting on the Aufrollhaspel Federal remains, whereby the strength of such an aluminum hot strip compared to the prior art can be significantly increased.
• the aluminum Hot strip rolling line can be manufactured in this way for AA5xxx alloys H2 or even H3 grades, without the otherwise necessary additional step of cold rolling.
• the above object is also achieved by a method of hot rolling an aluminum hot-rolled AlMgSi alloy of the AA6xxx group in an aluminum hot strip rolling mill comprising the steps
• a coiler temperature of ⁇ 250 ° C, preferably from 150 ° C to 230 ° C, wherein the process of finish rolling in a period of ⁇ 60 s is performed.
• the respective specific values must be used.
• T4 and T6 refer to the keys for the heat treatment according to DIN EN 515.
• the above object is also achieved by a method of hot rolling an aluminum hot-rolled strip made of an AlMg alloy of the AA5xxx group, e.g. AA5052, in an aluminum hot strip rolling mill, comprising the steps
• an aluminum hot strip can be produced, which achieves a strength value after hot rolling, which corresponds to a H2 or H3 specification, without performing a cold rolling process.
• the short rolling time per band element of less than 60 s allows a reduction of Rekristalisationsvorgangs between the last stitches 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 to 9.
• the invention enables the advantageous use of the produced aluminum hot strips, in components of a chassis or structural part or a sheet used in automotive, aircraft, or rail vehicle especially as a component, chassis part, outer or inner panel in automotive engineering, preferably as a body component.
• the invention is therefore also characterized by the use of an aluminum heat strip, which is produced by a method according to one of claims 10 to 12, for the production of a component, a chassis or structural part or used in automotive, aircraft, or rail vehicle Sheet especially as a component, chassis part, outer or inner panel in the automotive industry, preferably as a body component.
• Fig. 1 shows a schematic representation of the finishing rolling area of an aluminum hot strip rolling mill according to the invention
• Fig. 2 shows a schematic representation of details of the belt drying of
• FIG. 5 shows a schematic view of a rolling mill four-stand tandem
• Fertigwalz Nodet al. a aluminum hot strip rolling mill according to the invention feasible temperature-time path (cooling curve) without activated in the outlet area cooling section compared to the prior art and in
• Fig. 6 schematically a process control.
• tandem finishing train 1 shows the tandem finish rolling mill area of an aluminum hot strip rolling mill according to the invention comprising a tandem finishing train 2 comprising four tandem stands 1, a pre-belt cooler 3 in the inlet area of the tandem finishing train 2 and an associated cooling section 4 in the outlet area of the aluminum hot strip rolling mill. Between the individual tandem rolling stands 1 intermediate stand cooling 5 are arranged. In the rolling direction behind the tandem finishing train 2 and before the cooling section 4 is a Beklamschere 6 is arranged and in the rolling direction behind the cooling section 4 and in front of a rolled aluminum hot strip 7 receiving Aufrollhaspel 8 is a belt drying 9 is arranged.
• measuring devices or measuring devices 10 are arranged, with which the belt temperature (s), belt speed (s), belt surface (s) or the like can be detected.
• These measuring devices or measuring devices 10 are in operative connection with a control and / or regulating device 1 1 shown schematically in FIG. 6, with which the tandem rolling stands 1, in particular the rolling speed, the cooling section 4 and the interstand cooling 5 and, if desired, the pre-strip cooling 3, are independent of one another and the belt drying 9 can be controlled and regulated.
• the independent control and regulation of the individual cooling devices consists, for example, in that an activation or deactivation as well as the cooling medium mass flow of the pre-strip cooler 3, in particular but intermediate cooling 5 and cooling section 4, emitted to the aluminum hot strip 7 can be carried out independently of one another and independently of the control of the rolling speed ,
• the arranged before the rewinder 8 belt drying 9 makes it possible to remove after the passage of the cooling section 4 still on the surface of the aluminum hot strip 7 befindliches cooling medium and thus prevent surface defects.
• the cooling section 4 and the intermediate cooling 5 are formed as a laminar band cooling or spray cooling.
• Preferred cooling medium is a (usual) rolling emulsion or demineralized water.
• the belt drying has 9 drying devices anddemediumab 1940 adopted in the form of a catcher with symbolsabspritzung 12, a Gegenabspritzung 13, so-called Air Knifes 14 and a suction 15.
• FIG. 3 it can be seen from FIG. 3 that even existing aluminum hot strip rolling mills can easily be retrofitted with the cooling possibility according to the invention, for which it is only necessary to optionally extend the outlet region and to move an initially existing rewinder 8 'to the position of the rewinder 8 , so that space for the cooling section 4 and the belt drying 9 is created, or provide the Aufrollhaspel 8 in addition to the Aufrollhaspel 8 '.
• the intercoolers 5 are retrofitted and, if desired, the Vorbandkühler 3 is arranged on the inlet side.
• the cooling curves or temperature-time paths shown in FIG. 4 show that, with the invention in the area of the multi-stand tandem finishing train 2 of the aluminum hot strip rolling mill according to the invention, a considerably faster cooling - and temperature-dependent targeted cooling - of the aluminum Hot strip 7 is possible. While the cooling in an inventively equipped tandem finishing train 2 within a minute or within 60 s and this also to a much lower temperature is possible, this can not be achieved in systems according to the prior art.
• FIGS. 4 and 5 again shows the effect of the intermediate cooling 5 in the four-stand tandem finishing train 2, wherein the activation and the action of the cooling section 4 in the outlet area on the temperature-time path before the winding of the aluminum hot strip 7 on the rewinder 8 and the cooling in the collar is dispensed with.
• the course of the cooling curve or the temperature-time path without interstand cooling is shown as a solid line and the cooling curve or the temperature-time path with activated inter-frame cooling is shown as a dashed line. It can be seen from FIGS. 4 and 5 how the cooling process of the rolled and rolled aluminum hot strip 7 to be rolled can be controlled so that the individual cooling devices 3, 4 and 5 can be activated depending on the desired result with respect to grain fineness or deactivated can remain unused.
• FIG. 6 schematically shows the control and / or regulating device 11 to which the measured values determined by the measuring devices or measuring devices 10, which represent the rolling result and the state of the rolling process, are fed 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 stored in the control and / or regulating device 1 1 and shown technological process model 16 is constructed such that it takes into account the changes in the heat transfer coefficient during the cooling of the aluminum hot strip 7 and incorporated into the control and / or regulating operations.
• the technological process model 16 takes into account the reaction of the respective temperature level of the aluminum hot strip 7 during the individual passes in the tandem stands 1 of the tandem finishing train 2 on the friction between the rolling emulsion or the respective rolls and the respective aluminum hot strip material and binds this in the Control and / or regulating operations. As can be seen from FIG.
• the technological process model 16 acts on the presetting (setup) of the individual devices of the aluminum hot strip rolling mill and, in particular, the area of the tandem finishing train 2 shown here with pre-cooler 3, intercoolings 5 and associated cooling section 4 and Belt drying 9 a by generating control and / or control signals, which are then by means of the control and / or regulating device 1 1 the respective facilities, such as tandem stands 1, Vorbandkühler 3, cooling section 4, intercooling 5 and belt drying 9 transmitted.
• Part of the control and / or regulating device 1 1 is a non-illustrated process computer in which the technological process model 16 is stored and controls the setting of the desired temperature-time paths and the control device.
• the cooling devices 3, 4 and 5 may be designed such that they are width-dependent with respect to the rolled aluminum hot strip 7 controllable.
• the aluminum hot strip rolling mill according to the invention, it is possible to set and drive individual, special and possibly alloy-dependent time paths with respect to the temperature and / or the forming rates set in the tandem stands 1, in order to achieve a respective desired result with regard to the respective To obtain aluminum alloy of the rolled aluminum hot-band adjusting structure and the material property and / or strength determined thereby. It is therefore possible, independently of each other, to control the forming, the (cooling) time and the temperature without loss of production at the aluminum hot strip rolling mill according to the invention. Rather, even an increase in production in relation to comparable finishing mills according to the prior art is possible. For each usable aluminum alloy, such conditions can be set that the precipitates are finely distributed in the rolled product.
• the interstand refrigeration 5 can be used particularly advantageously if the recrystallization at relatively low temperatures only partially or not more occurs and thus the activation energy for recrystallization in the coiled coil on the rewinder 8 can be cumulated by the remaining deformation energy.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
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• 2013
  • 2013-10-25 DE DE201310221710 patent/DE102013221710A1/de active Pending
• 2014
  • 2014-09-16 MX MX2016005282A patent/MX368535B/es active IP Right Grant
  • 2014-09-16 JP JP2016525986A patent/JP2016533901A/ja active Pending
  • 2014-09-16 CN CN201480071115.8A patent/CN105848797B/zh active Active
  • 2014-09-16 US US15/030,446 patent/US10384248B2/en active Active
  • 2014-09-16 KR KR1020167013097A patent/KR20160072231A/ko not_active Ceased
  • 2014-09-16 EP EP14766186.2A patent/EP3060358B2/de active Active
  • 2014-09-16 WO PCT/EP2014/069724 patent/WO2015058902A1/de not_active Ceased
• 2016
  • 2016-04-19 ZA ZA2016/02660A patent/ZA201602660B/en unknown

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