Method for producing an aluminum strip and casting-rolling system for producing an aluminum strip

Abstract

A method for producing an aluminum strip (2) in a coupled casting-rolling process, includes the following steps: a) melting an aluminum raw material comprising at least one aluminum alloy in at least one melting assembly (4); b) determining the alloy composition of the melt (3); c) casting the melt (3) to form a hot strip by means of at least one strip-casting machine (6); d) rolling the hot strip in a rolling system (14) comprising at least one rolling device for shaping the hot strip for thickness and/or width reduction; and e) regulating and/or controlling at least one shaping parameter of the rolling system (14) as a function of the alloy composition of the melt (3). The disclosure also relates to a casting-rolling system (1) for carrying out the method.

1 .- 24 . (canceled) 
     
     
         25 . A method for producing a cast aluminum strip in a coupled casting-rolling process, comprising:
 melting an aluminum raw material comprising an aluminum alloy in a melting assembly;   determining an alloy composition of the melt;   casting the melt to form a hot strip by a strip-casting machine;   rolling the hot strip in a rolling system comprising a rolling device and thereby shaping the hot strip by reducing a thickness and/or a width thereof; and   regulating and/or controlling a shaping parameter of the rolling system as a function of the alloy composition of the melt.   
     
     
         26 . The method according to  claim 25 ,
 wherein the coupled casting-rolling process is a continuous process.   
     
     
         27 . The method according to  claim 25 ,
 wherein the shaping parameter is selected from the group of parameters consisting of thickness reduction of the hot strip, width reduction of the hot strip, strip temperature of the hot strip, rolling speed, strip tension of the hot strip, rolling force, roll bending, axial adjustment of at least one roll, roll gap geometry, rolling torque, cooling of the rolls, and lubrication of the rolls.   
     
     
         28 . The method according to  claim 25 ,
 wherein the regulating and/or controlling comprises a pre-control of the rolling system for a given and/or selected strip length section of the cast aluminum strip as a function of the alloy composition.   
     
     
         29 . The method according to  claim 28 ,
 wherein the pre-control comprises specifying a target value for thickness and/or profile regulation of the rolling device.   
     
     
         30 . The method according to  claim 25 ,
 wherein the melt has a recyclate content in the form of aluminum scrap of at least 95 percent by weight.   
     
     
         31 . The method according to  claim 25 ,
 wherein the aluminum alloy is selected from the group consisting of aluminum alloys AA2XXX, AA5XXX, AA6XXX, and AA7XXX.   
     
     
         32 . The method according to  claim 25 ,
 wherein casting the melt produces the hot strip with a thickness of 10 mm to 30 mm.   
     
     
         33 . The method according to  claim 25 ,
 wherein casting the melt is effected at a casting speed of 4 m/min to 16 m/min.   
     
     
         34 . The method according to  claim 25 , further comprising
 abrasive surface conditioning an upper side and/or a lower side of the cast aluminum strip.   
     
     
         35 . The method according to  claim 25 ,
 wherein the rolling is carried out at a temperature between 300° C. and 500° C. and with a thickness reduction of 20% to 75% per rolling mill stand in relation to an initial thickness of the hot strip.   
     
     
         36 . The method according to  claim 25 ,
 wherein the casting of the melt is carried out using at least one casting machine with a moving mold.   
     
     
         37 . The method according to  claim 25 , further comprising
 operating a plurality of melting units with different alloy compositions in parallel.   
     
     
         38 . The method according to  claim 25 , further comprising
 mixing melts with different alloy compositions.   
     
     
         39 . The method according to  claim 25 , further comprising
 setting a temperature of the hot strip prior to rolling.   
     
     
         40 . The method according to  claim 25 , further comprising
 quenching the cast aluminum strip downstream of the at least one rolling device.   
     
     
         41 . An intermediate aluminum product obtained by the method in accordance with  claim 25 , comprising at least 95% by weight of recyclate. 
     
     
         42 . A casting-rolling system for producing a cast aluminum strip, comprising:
 a melting assembly;   a strip-casting machine; and   a rolling device;   means for determining an alloy composition of an aluminum melt; and   a regulating and control device, configured for regulating and/or controlling a shaping parameter of the rolling device as a function of the alloy composition of the melt.   
     
     
         43 . The casting-rolling system according to  claim 42 ,
 wherein the strip-casting machine is a casting machine with a moving mold.   
     
     
         44 . The casting-rolling system according to  claim 42 ,
 wherein the melting assembly is a multi-chamber melting furnace.   
     
     
         45 . The casting-rolling system according to  claim 42 , further comprising
 a plurality of rolling mill stands, each having two working rolls and at least two support rolls along with at least two hydraulic adjusting cylinders for setting a roll gap.   
     
     
         46 . The casting-rolling system according to  claim 42 , further comprising
 means for abrasive surface conditioning of the cast aluminum strip, arranged upstream of the rolling device.   
     
     
         47 . The casting-rolling system according to  claim 42 , further comprising
 a trimming shear, which is arranged downstream of a rolling device and upstream of a coiler.   
     
     
         48 . The casting-rolling system according to  claim 42 , further comprising
 a scrap return system of process scrap into a storage level of the melting assembly.