WO2021245355A1 - Procede et equipement de refroidissement sur un laminoir reversible a chaud - Google Patents
Procede et equipement de refroidissement sur un laminoir reversible a chaud Download PDFInfo
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- WO2021245355A1 WO2021245355A1 PCT/FR2021/051002 FR2021051002W WO2021245355A1 WO 2021245355 A1 WO2021245355 A1 WO 2021245355A1 FR 2021051002 W FR2021051002 W FR 2021051002W WO 2021245355 A1 WO2021245355 A1 WO 2021245355A1
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- Prior art keywords
- blank
- cooling
- hot rolling
- rolling mill
- nozzles
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Classifications
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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
- B21B1/30—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
- B21B1/34—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 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
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the 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
-
- 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
Definitions
- the invention relates to the field of rolling flat aluminum alloy products. More specifically, the invention relates to a reversible hot rolling mill equipped with a particularly rapid, homogeneous and reproducible cooling system for flat aluminum alloy products.
- the invention also relates to the process implemented by said reversible hot rolling mill equipped with a cooling system which allows better thermal control of flat aluminum alloy products during rolling.
- the invention also relates to a thin sheet, the method of which uses cooling during hot rolling which can be achieved by the invention.
- a hot line for rolling aluminum alloys always includes a reversible rolling mill (that is to say one that rolls back and forth) also called blank or rougher and, possibly, a multi-stand rolling mill also called tandem rolling mill. , at the exit of which the still hot metal is coiled.
- the number of passes and the take-up (reduction in thickness per pass) depend on the hardness of the product (its flow stress) and of course, on the power of the rolling mill, in terms of torque and force. Productivity requires that we take the greatest possible reductions with each pass.
- Hot lines are also known in which two reversible rolling mills follow one another followed by a tandem rolling mill.
- This application aims to propose, for a hot rolling train for aluminum strips comprising a tandem finishing rolling train with several stands comprising at least one unwinder mounted downstream in the direction of rolling and at least one associated cooling section, a solution which makes it possible to better adjust the cooling curves and the temperature-time paths in the product to be rolled during the hot rolling of aluminum strips.
- the cooling section (s) are arranged in the exit area of the hot aluminum strip rolling train, and at least one trimming shear installed downstream in the rolling direction is associated with the finishing rolling train. tandem.
- EP2991783 relates to a method of manufacturing a metal strip.
- This patent relates to a method of manufacturing a metal strip whereby the strip is rolled in a multi-stand rolling mill, is taken out behind the last stand of the rolling mill in the direction of transport and cooled in a cooling device.
- the strip or sheet is subjected directly after passing through the working rolls of the last rolling stand to an additional rapid cooling, the cooling of the strip.
- Patent application WO200889827 relates to a device for cooling a metal strip.
- This application relates to a device for cooling a metal strip between two rolling mill stands, the strip being guided on an upper guide element of planar design.
- a spray member which conducts coolant through at least one opening in the upper guide member towards the lower side of the strip.
- at least two openings juxtaposed in the direction transverse to the direction of advance of the web are made in the upper guide member and have an elongated shape. The longitudinal axis of the opening is oriented at an angle with respect to the direction of advance of the strip.
- Patent application WO2016 / 012691 relates to a cooling method and equipment.
- This application relates to a process for cooling a rolling plate made of aluminum alloy, after the heat treatment of metallurgical homogenization of said plate and before its hot rolling, characterized in that the cooling of a value of 30 at 150 ° C is carried out at a speed of 150 to 500 ° C / h, with a homogeneity of less than 40 ° C over the entire treated part of the plate.
- This request also relates to the installation allowing the implementation of said method as well as said implementation.
- Patent application WO 2018/011245 relates to a process for manufacturing a thin sheet of aluminum alloy of the 6xxx series comprising the following steps: casting of an aluminum alloy of the 6xxx series to form an ingot ; homogenization of the ingot; cooling the homogenized ingot at a cooling rate of at least 150 ° C / h directly to the starting temperature of the hot rolling; hot rolling the ingot to a final thickness and winding to the final thickness after hot rolling under conditions making it possible to obtain a recrystallization rate of at least 50%; cold rolling to obtain a thin cold rolled sheet.
- the method of the invention is particularly useful for the manufacture of thin sheets intended for the automotive industry which combine a high tensile yield strength and a formability suitable for cold stamping operations, thus than excellent surface quality and high corrosion resistance with high productivity.
- Patent application EP1165851 relates to a process for converting an ingot of an aluminum alloy of series 6000 into a self-annealing sheet. This process involves subjecting the ingot to a two-step homogenization treatment, firstly at a temperature at least 560 ° C, then at a temperature between 450 ° C and 480 ° C. This process then consists in hot rolling the homogenized ingot at an initial temperature of between 450 ° C and 480 ° C, then at an arrival temperature of between 320 ° C and 360 ° C. There is thus obtained a hot-rolled sheet comprising an exceptionally low Cube recrystallization component.
- the patent application US2016 / 0201158 relates to new processes making it possible to increase the productivity on a continuous annealing and re-solution heat treatment line for aluminum sheet products for the automotive industry which are suitable for treatment. thermal with high T4 and post-curing resistances and reduced lineage.
- the methods according to the invention can be used in the automotive industry.
- the alloys suitable for heat treatment and the methods according to the invention can also be applied in the maritime, aerospace and transport industries.
- Patent application EP1375691 relates to a type 6000 aluminum alloy rolled sheet containing Si and Mg as main components and having excellent formability sufficient to allow machining on a flat flap, excellent dent resistance, and good hardenability. during baking of a coating.
- the alloy sheet exhibits a Lankford coefficient anisotropy greater than 0.4 or a resistance coefficient for texture cube orientations greater than or equal to 20, and has a critical radius of curvature less than or equal to 0.5 mm at 180 ° C, bending even when the strength at the conventional yield point exceeds 140 MPa by aging at room temperature.
- Also disclosed is a method of producing the aluminum alloy rolled sheet which comprises subjecting an ingot to homogenization treatment, cooling it to a temperature below 350 ° C at a cooling rate of 100 ° C. / hour or more, optionally to room temperature, reheating it to a temperature of 300 to 500 ° C and subjecting it to hot rolling, performing cold rolling of the hot rolled product, and subjecting the cold-rolled sheet undergoes a solution treatment at a temperature greater than or equal to 400 ° C. before proceeding to quenching.
- Application EP0786535 relates to the homogenization, at a temperature not lower than 500 ° C, of an aluminum alloy ingot containing not less than 0.4% by weight and less than 1.7% by weight of Si , not less than 0.2% by weight and less than 1.2% by weight of Mg, as well as of I ⁇ I and inevitable impurities as the balance, then the product obtained is cooled from a temperature not lower than 500 ° C to a temperature in the range between 350 and 450 ° C, and the starting point of which allows hot rolling. With the hot rolling step completed at a temperature in the range of 200 to 300 ° C, the obtained product is subjected to cold rolling at a reduction ratio of not less than 50%, immediately before its processing. in solution.
- the cold-rolled product is then subjected to a solution treatment in which it is stored at a temperature in the range of 500 to 580 ° C, at a rate of temperature increase of not less than 2 ° C / s. for not more than 10 minutes, then the product obtained is subjected to hardening during which it is cooled to a temperature not higher than 100 ° C, at a cooling rate not lower than 5 ° C / s.
- a process for producing an aluminum alloy plate for molding which exhibits high strength and moldability, as well as excellent exterior appearance on its post-molding surface, which is used. suitably as a material for parts of transportation equipment, such as exterior plates for automobiles.
- J patent application P2015067857 relates to providing an aluminum alloy sheet based on AI-Mg-Si for automotive panel excellent in drawability, pliable capable of processing flat bending, property of shape stability , hardening of coating seizure and corrosion resistance, and to provide a manufacturing method for this purpose, with aluminum alloy sheet based on AI-Mg-Si for automotive panel contains Si: 0.4 to 1.5%, Mg: 0.2 to 1.2%, Cu: 0.001 to 1.0%, Zn: 0.5% or less, Ti: 0.1% or less, B: 50 ppm or less , one or more kinds of Mn: 0.30% or less, Cr: 0.20% or less and Zr: 0.15% or less, and the remainder Al with inevitable impurities.
- Patent application WO2019241514 relates to systems and methods for quenching a metal strip after rolling.
- This application relates to systems and methods for tempering a metal substrate, comprising cooling an upper surface and a lower surface of the metal substrate until a web temperature is cooled to an intermediate temperature. The cooling of the upper surface of the metal substrate is stopped when the strip temperature reaches the intermediate temperature, and the cooling of the lower surface of the metal substrate is continued until the metal substrate reaches a target temperature, the target temperature being lower than the intermediate temperature.
- Patent application FR2378579 relates to a process for the rapid cooling of a continuous casting bar, round or slab, resting on a rolling track and subjected to water spraying. According to this application, this method is characterized in that said bar is moved with a reciprocating movement during the total duration of the cooling, the stroke of this movement being greater in the direction of extraction than in the opposite.
- the patent US6309482 relates to the in-line combination of a reversible rolling mill (Steckel rolling mill) and its coil furnaces with an accelerated cooling device controlled immediately downstream thereof and the associated process make it possible to roll steel sequentially. reversibly to achieve an overall reduction of at least about 3: 1.
- the patent US9643224 relates to a device for the cooling of rolled products, preferably for cooling during cold rolling, comprising a nozzle for the application of a cooling agent on the rolled products, a cooling chamber in fluid communication with the nozzle and extending substantially parallel to the running plane of the strip being provided for the application of the cooling medium to the rolled products
- EP2979769 discloses a method and plant for manufacturing a steel plate by which a high quality steel plate having less variation in quality can be ensured. It also relates to a method of manufacturing a steel sheet, comprising a hot rolling step, a shape correction step and an accelerated cooling step in that order. Problem
- the problem that the present invention seeks to solve is to improve the productivity of reversible rolling mills without degrading the metallurgical quality of the products obtained, or even by improving the metallurgical quality and / or the productivity of the other transformation steps.
- a first object of the invention is a hot reversible rolling mill comprising two working rolls, an upper working roll (21) and a lower working roll (22), and at least one cooling system intended to cool a blank ( 11), said blank (11) moving on rollers (23) and passing through the hot reversible rolling mill between the two working rolls (21) and (22), said cooling system consisting of two cooling devices: one device for upper cooling of the blank (11) and a device for lower cooling of the blank (11) characterized in that:
- the upper cooling device comprises at least one ramp (30) of nozzles (35) arranged substantially parallel to the axis of the upper working cylinder (21), the nozzles (35) spraying with jets of cooling fluid (36) ) the upper face of the blank (11),
- the lower cooling device comprises at least one ramp (40) of nozzles (45) arranged between the rollers (23) or between the lower working cylinder (22) and the nearest roller (23), substantially parallel to the 'axis of the lower working cylinder (22), the nozzles (45) spraying the underside of the blank (11) with jets of cooling fluid (46), the axis of the jets of cooling fluid (46) being oriented substantially perpendicular to the lower surface of the blank (11).
- Another object of the invention is a process for hot rolling aluminum alloys comprising the successive steps of a. supplying an aluminum alloy rolling plate with one or more aluminum alloys to a hot rolling inlet temperature, b. production of a plurality of hot rolling and / or cooling passes with the hot rolling mill according to the invention, the cooling system serving at least once, c. transferring the blank (11) or the finished product in sheet or strip form to a hot rolling outlet temperature for the remainder of the transformation process.
- Yet another object of the invention is a process for rolling an aluminum alloy of the AA6xxx series comprising the successive steps of: a. casting of a AA6xxx series alloy rolling plate, b. homogenization of the rolling plate, optionally followed by reheating, c. first hot rolling to transform the rolling plate into a blank having a first exit thickness from a first hot rolling start temperature, d.
- Yet another object of the invention is a thin sheet obtained according to the process of the invention, such as after dissolving treatment in a continuous heat treatment furnace operating in such a way that the holding time equivalent to 560 ° C, , is less than 20 s, the equivalent holding time being calculated using the equation
- Figure 1 perspective diagram of a blank passing through a rolling mill, the cooling system not being shown.
- Figure 2 top view of a blank passing through a rolling mill according to the invention, the convex envelope of the surfaces sprayed directly by the jets of cooling fluid during their first impact on the blank being shown.
- Figure 3 bottom view of a blank passing through a rolling mill according to the invention, the convex envelope of the surfaces sprayed directly by the jets of cooling fluid during their first impact on the blank being shown.
- Figure 4 another top view of a blank passing through a rolling mill in a preferred embodiment of the orientation of the cooling fluid jets, the cooling fluid jets during their first impact on the blank being shown.
- Figure 5a Diagram of nozzles with quick response valves.
- Figure 5b diagram of nozzles with quick response valves.
- Figure 6 longitudinal sectional diagram of an embodiment of a rolling mill according to the invention.
- Figure 7 longitudinal sectional diagram of another embodiment of a rolling mill according to the invention.
- Figure 8 longitudinal sectional diagram of another embodiment of a rolling mill according to the invention.
- Figure 9 longitudinal sectional diagram of another embodiment of a rolling mill according to the invention.
- Figure 10 longitudinal sectional diagram of another embodiment of a rolling mill according to the invention.
- Figure 11a cross-sectional diagram of an embodiment of a rolling mill according to the invention.
- Figure 11b cross-sectional diagram of an embodiment of a rolling mill according to the invention.
- Figure 12 longitudinal sectional diagram of another embodiment of a rolling mill according to the invention.
- Figure 13 longitudinal sectional diagram of another embodiment of a rolling mill according to the invention.
- Figure 14 longitudinal sectional diagram of another embodiment of a rolling mill according to the invention.
- Figure 15 a longitudinal sectional diagram of another embodiment of a rolling mill according to the invention.
- Figure 16 diagram of the cooling system control principle.
- Figure 17 example of the temperature heterogeneity of the blank for a process according to the prior art.
- Figure 18 example of the temperature heterogeneity of the blank using the rolling mill according to the invention according to a preferred embodiment.
- Figure 19 example of the rapid cooling of a 114 mm AA6XXX aluminum sheet from 470 ° C to 420 ° C for 8s with hot rolling emulsion with a rolling mill according to the invention according to another preferred embodiment .
- Figure 20 example of the rapid cooling of a 140 mm AA6XXX aluminum sheet from 470 ° C to 420 ° C for 10s with hot rolling emulsion with a rolling mill according to the invention according to another preferred embodiment .
- Figure 21 photo of the surface quality in line (“roping”) without the invention as described in example A.
- Figure 22 photo of the surface quality in line ("roping") without the invention as described in example B.
- Figure 23 photo of the surface quality in line ("roping") with the invention such as described in Example D.
- Figure 24 photo of the surface quality in line (“roping”) with the invention as described in example E.
- Figure 25 metallographies showing the rate of recrystallization under different conditions
- Figure 26 graph showing the effect of the duration of the solution on a mechanical property
- the metallurgical states in question are designated according to European standard EN-515.
- the static mechanical properties in traction are determined by a tensile test according to standard NF EN ISO 6892-1.
- blank is used here for an intermediate product made of an aluminum alloy obtained by rolling a rolling plate such as an ingot or a foundry plate, optionally scalped, optionally plated with one or more aluminum alloys, intended for manufacturing of a finished product in the form of strips or sheets of aluminum alloy, optionally plated with one or more aluminum alloys.
- a blank is therefore a rolled product, the thickness of which is intermediate between the rolling plate and the finished product.
- rolling mill refers here to a “reversible rolling mill”.
- the present inventors have in particular observed that, taking into account their hardness, most aluminum alloys have a tendency to heat up too much with each setting of the pass. It is then necessary to slow down the rolling mill by making smaller passes, for example, or by leaving a waiting time between each rolling pass.
- cooling the blank during the hot rolling step makes it possible to improve the productivity of a hot rolling mill or to create new, more economical manufacturing processes by eliminating production steps. , while maintaining the same or improved metallurgical quality of the products.
- cooling the blank during rolling on reversible rolling mills can also surprisingly provide the finished rolled product with additional physical properties, such as mechanical properties, surface finish or corrosion resistance.
- the hot reversible rolling mill comprises two working rolls, an upper working roll (21) and a lower working roll (22), and at least one cooling system intended to cool a blank (11), said blank (11) moving on rollers (23) and passing through the hot reversible rolling mill between the two working rolls (21) and (22), said cooling system consisting of two cooling devices: an upper blank cooling device (11) and a lower blank cooling device (11).
- the many other parts and systems of the hot rolling mill which are well known to those skilled in the art, for example without limitation support rolls, motors, columns, extensions, are not shown in the figures.
- the upper cooling device comprises at least one ramp (30) of nozzles (35) arranged substantially parallel to the axis of the upper working cylinder (21), the nozzles (35) being sprayed with jets of cooling fluid (36). the upper face of the blank (11).
- the lower cooling device comprises at least one ramp (40) of nozzles (45) disposed between the rollers (23) or between the lower work roll (22) and the nearest roller (23), substantially parallel to the axis of the lower working cylinder (22), the nozzles (45) spraying the underside of the blank (11) with jets of cooling fluid (46), the axis of the jets of cooling fluid (46) being oriented substantially perpendicular to the lower surface of the blank (11).
- Figure 1 shows a blank (11) passing through a reversible hot rolling mill (the cooling system is not shown in this figure).
- Figure 1 shows the edges (111), the edges (1111) and the ends (112).
- the blank (11) is represented in a simplified manner as a parallelepiped while the reality is more complex.
- the ends (112) correspond to the part of the blank (11) which engages first or which emerges last from the grip of the cylinders (21) and (22).
- the ends (112) are shown in Figure 1 in a simplified manner as a parallelepiped. Those skilled in the art are familiar with the ends (112) because they will have to be removed to ensure the manufacture and quality of the final product.
- the ends (112) are generally deformed by becoming rounded and by opening in two under the effect of hot rolling, this phenomenon is called “crocodiling” by those skilled in the art.
- the ends (112) also correspond to the zones of the blank where the rolling is not homogeneous along the length.
- the ends (112) can also contain zones corresponding to the transient starting or ending regimes of the casting during which the plate was manufactured.
- the length of the ends (112) depends on the alloys, rolling and casting conditions and end applications. This removal of the ends (112) can take place both on a shear installed on the hot train and later in the manufacturing process according to the specific constraints of the final product and its manufacturing process.
- the length of the ends (112) can typically take the maximum values of 100mm, 200mm, 300mm, 400mm, 500mm or 600mm.
- the songs (1111) are the faces which connect the upper face of the blank (11) in contact with the upper cylinder (21) and the lower face of the blank (11) in contact with the lower cylinder (22) without forming part of the ends (112) .
- the edges (111) are the part of the blank (11) near the edges (1111) to the exclusion of the ends (112).
- the strands (111) are well known to those skilled in the art because they must be removed to ensure the manufacture and the quality of the finished product.
- the edges (111) and the edges (1111) have a much more complex shape than that shown diagrammatically in FIG. 1 because there often appear cracks and folds, well known to those skilled in the art. These deformations must be removed.
- the edges (111) are not rolled homogeneously across the width given the proximity of the edges (1111) and they must be removed to ensure the properties of the final product. This removal of the edges (111) can take place both at the end of hot rolling and subsequently in the manufacturing process according to the specific constraints of the final product and of its manufacturing process.
- the width of the edges (111) can typically take the maximum values of 25mm, 50mm, 50mm, 75mm, 100mm, 125mm, 150mm, 175mm, 200mm or 250mm.
- an upper convex envelope (52) respectively lower (62) is defined as the convex envelope of the surfaces (51) respectively (61) sprayed directly by the jets of cooling fluid (36) respectively (46) during their first impact on the blank (11).
- An example of a convex envelope (52, 62) of the sprayed surfaces (51, 61) is illustrated by Figures 2 and 3 where the cooling system is not shown. Splashes and runoff are not taken into account in the convex envelope.
- a set is convex if for any segment, whose ends are in this set, each point of the segment is fully included in this set.
- the convex shell of an assembly is the smallest convex assembly containing it.
- the determination of the convex envelopes is carried out by separating the different cooling systems according to their function. Two cooling systems are separated if there are between them the cylinders (21) and (22).
- FIG. 7 illustrates a non-limiting example comprising a second cooling system.
- the convex envelopes of each system are analyzed separately because one system cools the blank (11) before passing between rolls (21) and (22) and the other after passing between rolls (21) and (22).
- FIG. 15 shows an example with 3 cooling systems, two on either side of the hot reversible rolling mill and a third which is further away and which serves, in the case of this non-limiting example, for rapid cooling before transferring the blank (11) to a second hot rolling mill with its rolls (25) and (26). Note that in Figure 15 two blanks are shown in two positions although it is possible that these blanks may not be present simultaneously.
- the maximum distance D55 to the cylinder (21) of the convex shell (52) is the maximum of the distance from any point of the convex shell (52) to the line Cl which is the projection of the axis of rotation of the cylinder (21) on the upper surface of the blank (11), minus the radius RI of the cylinder (21).
- the minimum distance D57 from the convex shell (52) to the cylinder (21) is the minimum of the distance from any point of the convex shell (52) to the line Cl which is the projection of the axis of rotation of the cylinder (21) on the upper surface of the blank (11), minus the radius RI of the cylinder (21).
- the maximum distance D65 to the cylinder (22) from the convex shell (62) is the maximum of the distance from any point of the convex shell (62) to the straight line C2 which is the projection of the axis of the cylinder (22) on the lower surface of the blank (11), reduced by the radius R2 of the cylinder (22).
- the minimum distance D67 from the convex shell (62) to the cylinder (22) is the minimum of the distance from any point of the convex shell (62) to the line C2 which is the projection of the axis of the cylinder (22) on the lower surface of the blank (11), reduced by the radius R2 of the cylinder (22).
- the area opposite the rolling mill (54) and the area next to the rolling mill (53) are surfaces which form part of a half plane which contains the upper convex shell (52) of the blank ( 11) considered as the simplified parallelepiped of figure 1 and which is delimited the straight line Cl.
- the zone opposite the rolling mill (54) is a half plane which does not contain the convex envelope (52) and which is delimited by a straight line El which is parallel to the straight line Cl and to the maximum distance D55 plus the radius RI of cylinder (21) of the straight line Cl.
- the zone next to the rolling mill (53) is delimited by the straight line Cl and by the straight line DI which is parallel to the straight line Cl and by the minimum distance D57 added to the radius RI of cylinder (21) of the right Cl.
- the direction S is that of the displacement of the blank (11).
- the distance D56 in the direction S of the convex casing (52) is the subtraction of the length D57 from the length D55.
- the distance D66 in the direction S of the convex casing (62) is the subtraction of the length D67 from the length D65.
- the upper cooling device consists of a ramp (30) of nozzles (35) arranged substantially parallel to the axis of the upper working cylinder (21), the nozzles (35) spraying with jets of cooling fluid (36) the upper face of the blank (11).
- the lower cooling device illustrated in Figure 6 consists of two ramps (40) of nozzles (45) disposed between the rollers (23), substantially parallel to the axis of the lower working cylinder (22), the nozzles (45 ) spraying the underside of the blank (11) with jets of coolant (46), the axis of the jets of coolant (46) being oriented substantially perpendicular to the lower surface of the blank (11) .
- the lower cooling device consists of a nozzle array (45) located between the lower working cylinder (22) and the nearest roller (23).
- FIG. 8 and FIG. 12 show upper cooling devices consisting respectively of two and three ramps (30) of nozzles (35).
- the lower nozzles (45) produce jets of cooling fluid (46) which directly reach neither the rollers (23) nor the cylinder (22) in the presence of the blank (11) and which are preferably almost tangent.
- the rollers (23) and the distance D67 of which is preferably greater than a radius of the lower cylinder (22), more preferably than the diameter of the lower cylinder (22) and / or the upper nozzles (35) produce jets of cooling fluid ( 36) which do not directly reach the upper working cylinder (21), preferably the distance D57 is greater than the radius of the upper cylinder (21), more preferably the distance D57 is greater than the diameter of the upper cylinder (21).
- the jets of cooling fluid (46) do not directly reach the rollers (23) so that these jets only influence the temperature of the blank (11).
- the jets of fluid of cooling (46) do not directly reach the cylinder (22) so that these jets only influence the temperature of the blank and do not disturb the temperature field of the cylinder (22) which is an important factor for the quality of the hot rolling.
- the distance D67 is greater than the radius RI of the lower cylinder (22), preferably the diameter of the lower cylinder (22) to prevent splashes of the jet of fluids (46) from reaching the cylinder (22) and disturbing the cylinder temperature field (22).
- the area of the lower surface of the preform (11) sprayed by the lower cooling fluid jets (46) is maximized to improve heat exchange.
- the jets (46) to pass flush with said rollers (23) without touching them as illustrated in FIG. 5b. (46) are therefore preferably almost tangent to the rollers (23).
- the invention thus makes it possible to maximize the sprayed surface in order to increase the useful surface for heat exchange.
- the jets (36) advantageously do not touch the rolls (22) so as not to disturb the temperature field of the rolls (21) which is an important factor in the quality of the hot rolling.
- the distance D57 is advantageous for the distance D57 to be greater than the radius RI of the upper cylinder (21), preferably for the distance D57 to be greater than the diameter of the upper cylinder (21) to prevent splashes of the jet of fluids (36) from reaching the cylinder. (21) and disturb the temperature field.
- Nozzles (24) illustrated in Figure 6 and dedicated to the cylinders (21) and (22) can be installed in order to cool or lubricate these members according to their specific needs independently of the blank (11).
- specific nozzles can be installed to cool the rollers (23).
- the position of the nozzles (24) in FIG. 6 is only as a principle and is not limiting.
- the lower nozzles (45) are below the plane passing through the axes of rotation of the rollers (23) located near said nozzles (45) and / or the lower nozzles (45) are protected by a part (47) having openings for passing the jets of cooling fluid (46) and / or the upper nozzles (35) are protected by a part (37) having openings for passing the jets of cooling fluid (36).
- Protecting the nozzles (35) and (45) is advantageous because the hot rolling can cause an opening of the ends (112) of the blank (11) which a person skilled in the art calls "crocodiling" and which can strike the ends. nozzles.
- the blanks (11) can also during hot rolling form bridges or boats, i.e.
- FIG. 7 is a non-limiting example where only the nozzles (35) are protected by a protective part (47).
- each nozzle (35) and (45) is supplied individually by a rapid response valve (49), the response time of which is advantageously less than 1 s, preferably less than 0.5 s, and more preferably less than 0.2 s.
- FIGS. 5a and 5b show nonlimiting examples of rapid response valves (49) mounted between a ramp (30) respectively (40) and a nozzle (35) respectively (45). Feeding the nozzles individually with quick release valves is advantageous because it allows each point of the upper surface and the lower surface of the blank (11) to be cooled in a specific way.
- the nozzles (35) and (45) are adapted to produce jets of cooling fluid (36) and (46) in flat and / or conical and / or cylindrical form. If the shape of the jets is cylindrical, the section of the cylinder is preferably circular. In one embodiment, the nozzles (35) and (45) are adapted to produce jets of cooling fluid (36).
- the nozzles (35) and (45) are able to produce jets of cooling fluid (36) and (46) by spraying, in the form of a solid cone, called conical jets.
- Taper jets (46) and (36) are a better configuration than flat or cylindrical jets. Indeed, the conical jets allow a better distribution of the cooling fluid on the blank (11). This thus allows a more homogeneous heat exchange and it is thus possible to obtain a blank (11) with, for example, a temperature heterogeneity of less than 20 ° C, preferably of less than 10 ° C.
- the conical jets of cooling fluid (46) have a cone angle of 90 °.
- This angle can be limited, for example to 60 °, by the presence of the rollers (23) so as not to spray them in particular when the nozzles (45) are below the plane passing through the axes of rotation of the rollers (23). If the rollers (23) are very close, it may be preferable to put the nozzles (45) above the plane passing through the axes of the rollers (23) to spray a larger area (61).
- the nozzle (451) is placed below the plane of the axes of rotation of the rollers 23 and produces a cooling jet (461).
- the nozzle (452) is placed above the plane of the axes of rotation of the rollers (23) and produces a cooling jet (462), the protective part (47) which should preferably be installed in this situation, is not shown.
- the jet (462) therefore sprinkles a larger area of the blank (11) not shown than the jet (461).
- At least one device (38) for discharging the cooling fluid from the upper surface of the blank (11) is installed above the blank.
- this device (38) are given with FIG. 8, FIG. 10 or FIG. 12.
- a device (38) can be installed above the zone opposite the rolling mill (54) and / or at- above the area next to the rolling mill (53).
- said device (38) is an air blast which pushes the cooling fluid towards one of the edges (111) of the blank (11) and preferably gives the cooling fluid a sufficient speed so that it does not run off. not on the songs (1111).
- the device (38) makes it possible to prevent the cooling fluid from flowing over the entire upper face of the blank (11).
- the device (38) for discharging the cooling fluid cooling is advantageously completed or replaced by the cylinder (21) which acts as a barrier blocking the flow of the cooling fluid. This makes it possible in particular to reduce the energy consumption of the device (38).
- FIG. 10 A non-limiting example of the configuration in which the device (38) for discharging the cooling fluid near the cylinder (21) is replaced by the cylinder (21) is illustrated in FIG. 10.
- the conical jets of the upper cooling device (36) have a cone angle ⁇ of at most 20 °, preferably substantially 15 ° or less and the cones of said conical jets have a substantially vertical axis.
- This configuration makes it possible to limit the flow of the cooling fluid onto the blank (11).
- the cooling system having at least one such conical jet is surrounded by a device for discharging the cooling fluid (38) as illustrated without limitation in FIG. 12.
- the cone angle a is illustrated by FIG. 5a, the cone angle a is the angle of the cone of the coolant jet produced by the nozzles.
- the conical jets of the upper cooling device (36) are inclined with respect to the vertical.
- the angle of inclination b is illustrated by FIG. 5a, it is the angle made by the axis of the nozzles with the straight line V perpendicular to the upper face of the blank (11).
- the difference b - a / 2 is greater than -20 °, preferably substantially greater than -15 °, more preferably positive or zero.
- a device for discharging the cooling fluid (38) is preferably installed to prevent runoff on the surface of the blank (11).
- the axis of the coolant jets (36) are advantageously oriented to bring the sprayed surfaces (51) closer to the surface.
- working cylinder (21) to take advantage of the barring effect of the cylinder (21).
- This configuration also makes it possible to increase the sprayed surfaces (51) to increase the cooling capacity of the cooling system.
- the jets of coolant are moved away from the working cylinder, it is advantageous to group the ramps of the upper cooling device (30) in pairs and to orient the axes of the coolant jets (36) so as to bring their respective sprayed surfaces (51) closer together.
- FIG. 8 is a non-limiting example of the previous embodiments.
- the nozzles near the working cylinder (351) have their axis oriented towards the working cylinder (21) and the difference b - a / 2 is greater than -20 °.
- the nozzle (352) is oriented vertically and the angle a of its conical jet (36) is less than 20 °.
- FIG. 9 is another non-limiting example of the previous embodiments.
- the nozzles near the working cylinder (351) are all angled to bring the sprayed surfaces (51) closer to the working cylinder and the difference b - a / 2 of the conical jets is positive or zero to prevent coolant runoff on the blank (11).
- FIG. 12 is another non-limiting example of the preceding embodiments with vertical conical cooling jets (36), the angle of which of the cone a is less than 20 °.
- FIG. 13 is another non-limiting example of the previous embodiments.
- the ramps (303) and (304) are matched, the nozzles (353) and (354) are oriented so that the sprayed surfaces (513) and (514), shown in figure 4, come together.
- the differences b - a / 2 are positive or zero.
- the upper sprayed convex casing (52) is facing each other with a tolerance of two, preferably once the dimension of the diameter of the upper working cylinder (21) of the sprayed convex casing.
- lower (62), preferably said convex envelopes (52, 62) are substantially vis-à-vis.
- the determination of the convex envelopes is carried out by separating the various cooling systems of the invention.
- Figure 7 illustrates a non-limiting example where there is a second cooling system.
- the convex envelopes of each system are analyzed separately because one system cools before the passage between the cylinders (21) and (22) and the other after the passage between the cylinders (21) and (22).
- Figure 15 shows an example with 3 cooling systems, two on either side of the hot reversible rolling mill and a 3rd which is further away and which serves, in the case of this non-limiting example, for rapid cooling before join a second hot rolling mill with its rolls (25) and (26). This arrangement is advantageous because it contributes to the thermal homogeneity of the blank (11).
- each cooling system Putting said upper and lower convex envelopes (52, 62) of each cooling system opposite each other is particularly advantageous because it allows homogeneous cooling in the thickness of the blank (11), which helps to control the flatness of the blank (11), which is an important characteristic for blanks which are flat products.
- all of the nozzles (35) and (46) are able to provide a surface flow rate per face of the blank (11) of cooling fluid of 1500 l / min / m 2 maximum, preferably 600 to 1200 l / min / m 2 . This fluid can be propelled by a propellant gas.
- the cooling fluid can be water, deionized water, a liquefied or non-liquefied gas, preferably an emulsion of water, preferably deionized, and oil and rolling additives, which is used for lubrication.
- the deionized water has a resistivity greater than 105 kQcm.
- the nozzles of the upper cooling device (35) are movable and maintained at a constant distance from the upper surface of the blank (11), preferably by being attached to the mechanism which holds the cylinder (21). This makes it possible to ensure better repeatability of the cooling of the blank (11).
- the nozzles (35) are not movable. In this less expensive non-mobile embodiment, it is therefore necessary to control the nozzles (35) which spray the banks (111) or near the banks (111), for example in the case where the nozzles (35) produce conical jets (36). In fact, in the case of conical jets (36) projected by fixed nozzles (35), the distribution of cooling fluid on the edges (111) widens as the thickness of the blank decreases.
- FIGS 11a and 11b are non-limiting examples of this situation.
- the blank (11) is shown at the start of hot rolling with figure 11a and at the end of hot rolling with figure 11b with each time the same number of upper nozzles (35) which produce jets of fluid of cooling (36). Due to the conical shape of the jets (36) and the reduction in the thickness of the blank (11), the edges (111) are not sprayed at the start of rolling illustrated in 11a although they are partially so. at the end of rolling illustrated in 11b.
- the intersection between the upper surfaces (51) sprayed directly by the jets of cooling fluids (36) with the upper face of the edge (111) is empty at the start of hot rolling, preferably during the entire duration of hot rolling.
- the intersection between the lower surfaces (61) sprayed directly by the jets of cooling fluids (46) with the lower face of the edge (111) is empty at the start of hot rolling, preferably during the entire duration of hot rolling.
- the nozzles (351) in proximity to the vicinity of the upper working cylinder (21) produce jets of cooling fluid (36) including all displacement components, projected on the direction S of movement of the blank (11), are oriented towards the working rolls (21) and (22) of the rolling mill.
- the jets of cooling fluids (36) of the upper cooling device are conical and the difference b - a / 2 is positive or zero.
- the upper sprayed convex envelope (52) and the lower sprayed convex envelope (62), not shown in FIG. 6, are near the cylinders.
- the rolling mill preferably the maximum distance D55 and D65 to the cylinders (21) and (22) of the sprayed convex envelopes (52) and (62) are less than 3 times the greater of the diameters of the working rolls (21) and (22) and / or the lengths D56 and D66 of said convex envelopes (52, 62) are less than two diameters, preferably a diameter of the largest of the working rolls (21) or (22).
- This embodiment is advantageous because it makes it possible to cool the blank (11) as soon as it leaves the grip of the rolls (21) and (22) and to prevent the blank from moving too far away from the rolls before start again in the other direction for the next pass of hot rolling. This is particularly advantageous because it improves the productivity of the hot rolling mill. In fact, the speed of reversible hot rolling mills is often limited to avoid heating which results in burns, cracks, crocodiling or even breakage of the blank (11).
- a second cooling system on the other side of said hot reversible rolling mill, the second cooling system preferably being symmetrical to the first with respect to a plane passing through the axes of the work rolls (21) and (22).
- This arrangement is advantageous because it makes it possible to cool the blank (11) until it enters the grip of the reversible rolling mill and as soon as it leaves the grip of the reversible rolling mill at each rolling pass and in an identical manner.
- the upper cooling device comprises at least one pair of ramps (303 and 304) of nozzles (353, 354), preferably 3 pairs of ramps ( 303 and 304), in each pair of ramps (303 and 304), the jets of cooling fluid (363, 364) being oriented in opposition, the difference b - a / 2 being positive or zero, preferably zero, a being l 'angle of the cone of the jet of cooling fluid produced by the nozzles and b being the angle of inclination made by the axis of the nozzles (353, 354) with the line V perpendicular to the upper face of the blank (11), the surfaces sprayed (513, 514) of the blank (11) by the jets (363, 364) preferably overlapping by a factor between 1/3 and 2/3, preferably 1/2
- the lower cooling device comprises at least one ramp (40) of nozzles (45), preferably 8 ramps (40), the jets of cooling fluid (46) of
- the blank (11) is substantially horizontal.
- the angles are shown schematically in the general case in FIG. 5a with the nozzles (35), the ramps (30) and the jets of cooling fluids (36).
- Figure 4 illustrates the sprayed surfaces (51).
- This configuration is advantageous because it causes the coolant to concentrate in at least part of the overlap area of the jets (36) and thus to reject the coolant at the edges with enough speed not to trickle down onto the jets (36).
- edges (1111) of the blank (11) which makes it possible not to overcool the edges (111) of the blank (11). This makes it possible to reduce the energy consumption of the devices (38) for discharging the cooling fluid, or even to be able to eliminate them.
- the upper cooling device comprises at least one ramp (30), preferably 6 ramps (30), of nozzles (35) and the lower cooling device comprises at least one ramp (40), preferably 8 ramps (40), of nozzles (45), all producing conical cooling fluid jets (36) and (46) whose axes are substantially perpendicular to the blank (11), and of which the angle a of the cone of the jets (36) is less than 20 °, preferably the angle a of the cone of the jets (36) is substantially 15 °.
- This device has the advantage of being simpler to construct.
- the angle of the conical jets makes it possible to limit the horizontal component of the speed of the cooling fluid during its impact on the blank (11), and consequently to limit the spreading of the cooling fluid on the blank (11) to control cooling.
- the reversible hot rolling mill according to the invention is part of a hot train in which the reversible hot rolling mill according to the invention is preferably followed by a second hot rolling mill, shown diagrammatically with its working rolls (25) and (26), which may be a reversible rolling mill or a tandem rolling mill.
- the cooling system of the reversible hot rolling mill according to the invention is placed between the reversible hot rolling mill according to the invention and the second hot rolling mill, preferably the distance between the heating system. cooling and the second hot rolling mill being sufficient for the cooling system according to the invention and the second hot rolling mill to operate from independently.
- This arrangement is advantageous because it makes it possible to carry out the cooling operation in the production flow and without loss of capacity during the transfer of the blank from the first to the second reversible hot rolling mill.
- the distance between the cooling system and the second hot rolling mill is also important because, if it is sufficient in relation to the length of the blank, it allows for example to choose different speeds to pass through the cooling system and to pass through the second hot rolling mill.
- the length of the blank is evaluated by EP * LP / e, where EP is the thickness of the plate, LP the length of the plate and e the thickness of the blank between the two rolling mills. In the embodiment illustrated by FIG.
- cooling systems for the reversible hot rolling mill according to the invention there are three cooling systems for the reversible hot rolling mill according to the invention, two systems positioned near and on either side of the working rolls (21,22) and a system placed between the reversible hot rolling mill according to the invention and the second hot rolling mill, preferably the distance between the cooling system and the second hot rolling mill being sufficient for the cooling system according to the invention and the second hot rolling mill operate independently.
- a subject of the invention is also a process for hot rolling aluminum alloys comprising the successive steps of a. supplying an optionally plated aluminum alloy rolling plate to a hot rolling inlet temperature, b. production of a plurality of hot rolling and / or cooling passes with the reversible hot rolling mill according to the invention, the cooling system serving at least once, c. transferring the blank (11) or the finished product in sheet or strip form to a hot rolling outlet temperature for the remainder of the hot working process.
- the minimum width of the blank (11) can typically take the values of 100mm, 200mm, 300mm, 400mm, 500mm, 700mm, 800mm, 900mm and 1000mm.
- the maximum width of the blank (11) can typically take the values of 1500mm, 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm and 5000mm.
- the minimum blank thickness (11) can typically take the values of 5mm, 6.35mm, 10mm, 12mm, 12.7mm, 15mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90 mm 100mm, 110 mm 120mm, 130 mm, 150 mm, 200 mm and 250mm.
- the maximum thickness of the blank (11), which typically is close to that of the cast plate, can typically take the values of 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm and 800mm.
- the minimum length of the blank (11) can typically take the values of 2m, 3m, 4m, 5m.
- the maximum length of the blank (11) can typically take the values of 6m, 7m,
- the maximum length is imposed by the distance between the reversible rolling mill. according to the invention and the tandem rolling mill or the second reversible hot rolling mill. This implies that all the configurations of lengths, thicknesses, before and after hot rolling above enumerated may not all be feasible depending on the industrial installation.
- the plate is supplied at a hot rolling inlet temperature. It may have been reheated and / or homogenized.
- the reversible hot rolling mill according to the invention performs a plurality of hot rolling and / or cooling passes with the hot rolling mill. There can therefore be cooling passes without rolling, and therefore without reducing the thickness of the blank. This function is advantageous because it allows to increase the cooling capacity of the cooling system if necessary.
- the method according to the invention comprises at least one pass with cooling with the cooling system according to the invention. Since the plate is supplied at the hot rolling inlet temperature, there is preferably no cooling before the first rolling pass.
- Operations such as cutting ends, shoring, cutting the blank into several smaller blanks, holding the blank, rotating the blank to change the hot rolling orientation of the blank (11) or the plate are usual operations during hot rolling. Examples of steps mentioned are not limiting. The presence of said usual operations is not an interruption of the hot rolling and does not limit the scope of the invention because they form part of the usual hot rolling operations.
- the blank is then transferred to a hot rolling outlet temperature of the reversible rolling mill according to the invention.
- the hot rolling outlet temperature is preferably at least 200 ° C, preferably at least 220 ° C, more preferably at least 240 ° C and more preferably at least 260 ° C.
- This hot rolling outlet temperature is a temperature compatible with performing a second hot rolling.
- the blank (11) can be transferred to any usual stage on a hot train: hot tandem rolling mill, second reversible hot rolling mill, hot winding or hot debitage.
- the blank comprises an aluminum alloy of the AA6xxx, AA5xxx, AA7xxx, AA3xxx, AA2xxx series.
- the blank comprises an alloy chosen from among AA3003, AA3004, AA3207, AA3104, AA4017, AA4025, AA5006, AA5052, AA5083, AA5086, AA5088, AA5154, AA5182, AA5251, AA5383, AA5754, AA5844, AA6006013, AA600609, AA , AA6016, AA6022, AA6056, AA6061, AA6111, AA6181, AA6216, AA6316, AA6451,
- the blank is plated on one or two sides, with one or more aluminum alloys from the AAlxxx, AA4xxx or AA7xxxx series, and preferably AA4004, AA4104, AA4045, AA4343, AA7072.
- the heterogeneity of the surface temperature of the blank (11) after its release from the grip of the rolling mill and the cooling device is less than 20 ° C and preferably less than 10 ° C.
- This characteristic obtained by virtue of the cooling system according to the invention, is useful for improving the repeatability of the metallurgical properties of the products.
- the heterogeneity of the blank (11) is defined as the difference between the temperature of the hottest point of the blank (11) with the temperature of the coldest point of the blank (11) except on the edges ( 111) and / or except on the ends (112) and alternately as the difference between the temperature of the hottest point of the blank (11) with the temperature of the coldest point of the blank (11).
- edges (111) are naturally cooler than the rest of the blank (11) given the heat exchange surface of the edge (1111).
- the lower edge temperature (111) is a cause of cracks or cracks on the edges which reduce the working width of the blank or which can cause it to break.
- the edges (111) of the blank (11) are therefore preferably cooled less than the rest of the blank by spraying the edges less than the rest of the blank (11).
- the nozzles (35) and (45), the jets (36) and (46) of which could spray the banks (111) are closed so as not to spray said edges (111).
- Figures 11a and 11b show a non-limiting example with a section along a plane perpendicular to the direction S passing through the upper (30) and lower (40) ramps. Certain upper (35) and lower (45) nozzles are closed so as not to spray the banks (111).
- the ends (112) are naturally cooler than the rest of the blank (11) taking into account the additional heat exchange surface at the ends.
- the lower temperature of the ends (112) is a cause of refusal of engagement of the blank during hot rolling.
- the ends (112) are therefore preferably cooled less than the rest of the blank by spraying the ends (112) less than the rest of the blank (11).
- the nozzles (35) and (45), the jets (36) and (46) of which could spray the ends (112) are closed during the passage of these ends.
- This function is preferably achievable by the individual supply of each nozzle (35) and (45) by a rapid response valve (49), the response time of which is advantageously less than 1 s, preferably less than 0.5 s, and more preferably less than 0.2s.
- the rapid response valves (49) are illustrated by the non-limiting example of Figures 5a and 5b. Therefore in one embodiment, the intersection between the upper surfaces (51) sprayed directly by the jets of cooling fluids (36) with the upper face of the ends (112) is preferably empty throughout the duration of the hot rolling. Therefore in one embodiment, the intersection between the lower surfaces (61) sprayed directly by the jets of cooling fluids (46) with the lower face of the ends (112) is preferably empty throughout the duration of the hot rolling.
- the cooling fluid is preferably in calefaction on the blank.
- Calefaction is a thin layer of vapor that appears between a fluid on a surface whose temperature is high enough (Leidenfrost effect). This is advantageous because it ensures an exchange homogeneous thermal compared to the situation where there are areas of the surface on which the fluid is not heating.
- a thermal model calculates the irrigation width and chooses the cooling mode at the ends (112), preferably the thermal model pre-sets the hydraulic system which supplies the ramps (30) and (40), then on each pass the thermal model compares the desired temperature with the calculated or measured temperature of the blank (11), and the thermal model controls the valves (49) of the nozzles (35) and (45) according to the position of the blank (11), preferably, the thermal model manages the upper (35) and lower (45) nozzles in a different way.
- the principle of the control of the cooling system is as shown schematically in FIG. 16.
- a thermal model encoded on a computer or an automatic device calculates the spraying width corresponding to the width of the blank.
- the sprinkling width excludes the shores (111) in order to cool them as little as possible in order to reduce faults such as shoreline cracks.
- the thermal model chooses the cooling mode at the ends (112).
- the ends (112) are not sprayed to cool them as little as possible to facilitate the engagements in the hot rolling mill and reduce the phenomenon of crocodiling.
- the model defines a pre-adjustment of the hydraulic system which supplies the ramps (30) and (40) so that the jets of cooling fluid (36) and (46) are established quickly as soon as the valves (49) are opened. .
- the thermal model compares the desired temperature with the calculated or measured temperature of the blank (11).
- the measured temperature can be obtained for example, without limitation, by a surface temperature measurement by non-contact infrared pyrometry or by a contact measurement on the surface of the blank (11).
- the calculated temperature can equally well relate to a surface temperature or an average temperature.
- the calculated temperature can be calculated with thermal simulation software, for example non-limiting MSC Marc.
- the thermal model controls the valves (49) of the nozzles (35) and (45) using the position and dimensions of the blank ( 11).
- the position of the blank (11) can be calculated or measured.
- the nozzles (35) and (45) are not powered for avoid, for example without limitation, that the jets (46) of the lower nozzles (45) spray the upper cylinder (21) or that the jets (36) of the upper nozzles (36) spray the lower cylinder (22) .
- the maximum heterogeneity of the surface temperature of the blank (11), preferably of the blank (11) except on the edges (111) and / or on the ends (112), after its release from the grip of the rolling mill and the cooling device may be less than 20 ° C and preferably less than 10 ° C.
- the thermal model manages the upper nozzles (35) and the lower nozzles (45) in a different way in order to avoid the formation of bridges or boats of the blank (11).
- the absolute value of the temperature difference between the upper face and the lower face of the blank (11) is less than 10 ° C, more preferably 7 ° C, more preferably 5 ° C, more preferably 2 ° C. More preferably, the temperature of the upper face of the blank (11) is substantially equal to the temperature of the lower face of the blank (11).
- the maximum level of temperature heterogeneity of the blank (11) desired with or without the edges (111) and / or the ends (112), the desired temperature are metallurgical choices which depend on the products to be produced.
- the control of the cooling system is integrated into the control system of the reversible hot rolling mill which controls the rolling parameters.
- the thermal device does not cool the surface of the blank (11) below the Leidenfrost temperature of the cooling fluid.
- the Leidenfrost temperature is the temperature above which the coolant is heating.
- the Leidenfrost temperature of the coolant sprayed onto the blank depends on the nature of the coolant and its flow rate per area. The value of this temperature is typically and approximately about 300 ° C for typical coolant, emulsion and oil and rolling additives, which is lower than usual hot rolling temperatures on a reversible rolling mill.
- the cooling system can cause a high temperature heterogeneity between the surface and the core of the preform (11).
- the surface temperature of the blank (11) is likely to be momentarily lower than the Leidenfrost temperature, which would significantly increase the risk of loss of thermal control in mean value and in homogeneity of the blank (11) thus cooled.
- the thermal model therefore checks on each pass that the watering planned for the following pass does not risk generating a roughing temperature lower than the Leidenfrost temperature.
- This formula is an approximation which requires in particular that the surface of the blank (11) remains above the Leidenfrost temperature.
- the range of thickness of the blank (11) for the application of said formulas has a minimum of 25mm, preferably 50, preferably 75mm, preferably 100mm, preferably 110mm and a maximum of 200mm, preferably 175mm, preferably 150mm, preferably 140mm , preferably 130mm, preferably 125mm, preferably 120mm.
- the hot rolling cycle time of a blank (11) made of AA6xxx alloy, preferably of AA6016 alloy is reduced by at least 30 seconds, preferably by at least 60 seconds, more preferably by 'at least 90 seconds with the method according to the invention, compared to rolling without using said method.
- the hot rolling cycle time of a blank (11) made of the AA5182 alloy is preferably reduced by at least 15 seconds for, preferably 20 s, more preferably 45 s compared to rolling without the aid of said process.
- the cycle time is the time between the start of the first pass and the end of the last pass of hot rolling with the reversible hot rolling mill of the invention.
- the cooling system is preferably used only once so as to reduce the average temperature of the blank from at least 50 ° C to an average temperature above 400 ° C, in less 10 seconds, preferably at least 8 seconds for a blank (11) with a thickness of at most 114 mm.
- the cooling system allows the temperature of the blank (11) to be controlled over a predefined thermal path during hot rolling.
- the thermal path is the change in the temperature of the blank (11) during the duration of rolling at hot.
- the thermal path is a metallurgical choice which depends on the alloy, the desired properties of the finished product and the capabilities of the hot rolling mill.
- the cooling system makes it possible to control the preform (11) on an isothermal thermal path.
- a thermal path is isothermal if the temperature of the blank (11) during hot rolling does not vary by plus or minus 10 ° C from the temperature of the plate just before the start of hot rolling.
- the temperature of the blank (11) remains substantially equal to the temperature of the plate before the start of hot rolling.
- the upper sprayed convex casing (52) and the lower sprayed convex casing (62), are close to the rolls of the rolling mill; preferably the maximum distances D55 and D65 to the cylinders (21) and (22) of the sprayed convex envelopes (52) and (62) in the direction S are less than 3 times the greater of the diameters of the working rolls (21) and ( 22) and / or the lengths D56 and D66 in direction S of said convex envelopes (52, 62) are less than a diameter of the largest of the working rolls (21) or (22).
- the convex envelopes (52, 62) are substantially facing each other.
- This embodiment is advantageous because it allows the blank (11) to be cooled as soon as it leaves the grip of the cylinders (21) and (22). This is particularly advantageous because the speed of reversible hot rolling mills is often limited to prevent heating of the blank (11) which results in burns or even breakage of the blank (11). This is particularly advantageous because it improves the productivity of the hot rolling mill. In fact, the speed of reversible hot rolling mills is often limited to avoid heating which leads to burns or even to ruptures of the blank (11).
- FIG. 7 there is preferably a second cooling system on the other side of said hot reversible rolling mill, of which FIG. 7 is a non-limiting example.
- the second cooling system is preferably symmetrical to the first with respect to a plane passing through the axes of the work rolls (21) and (22).
- This arrangement is advantageous because it allows the blank (11) to be cooled until it enters the right-of-way and as soon as it leaves the right-of-way of the reversible rolling mill at each rolling pass and in an identical manner.
- This system is advantageous because it allows better control of the temperature of the blank during its reversible rolling and this at each pass, which is beneficial for the metallurgical quality of the product and for the productivity of said reversible rolling mill.
- FIG. 9 and FIG. 10 are other non-limiting examples of the first embodiment.
- the cycle time of the hot rolling of the blank (11) is preferably reduced by at least 30 seconds for the AA6xxx alloys, preferably for the AA6016 alloy, preferably 60s, more preferably from 90s.
- the cycle time of the hot rolling of the blank (11) is preferably reduced by at least 15 seconds for the AA5182 alloy, preferably by 20 s, more preferably by 45 s.
- a second embodiment is a cooling system for rapidly cooling a blank (11) during hot rolling.
- This embodiment is designed to spray each point of the blank (11) for 10s, preferably 8 seconds. Those skilled in the art will know how to adapt the characteristics below to their particular rolling mill and to the speed of the blank (11).
- the upper cooling device comprises at least one pair of ramps (303 and 304) of nozzles (353, 354), preferably 3 pairs of ramps (303 and 304), in each pair of ramps (303 and 304), the jets of cooling fluid (363, 364) being oriented in opposition, the difference b - a / 2 being positive or zero, preferably zero , the surfaces sprayed (513, 514) of the blank (11) by the jets (363, 364) preferably overlapping by a factor of between 1/3 and 2/3, preferably 1/2, and the cooling device lower comprising at least 1 ramp (40) of nozzles (45), preferably 8 ramps (40), the jets of cooling fluid (46) of which are conical and of axis substantially perpendicular to the blank (11).
- the angle b is the angle between the axis of the nozzles (353, 354) with the straight line V perpendicular to the upper face of the blank (11).
- the angle a is the angle of the cone of the jet of cooling fluid produced by said nozzles. These angles are shown diagrammatically in FIG. 5a with the ramps (30), the nozzles (35) and the jets (36).
- This configuration is interesting because it causes the coolant to concentrate in at least a part of the area of overlap of the jets (36) and thus reject the cooling fluid at the edges with enough speed not to trickle down to the ends of the blank (11), which allows cooling of uniformly the entire length of the blank.
- This system also makes it possible to reduce the energy consumption of the devices (38) for discharging the cooling fluid, or even to be able to eliminate them.
- the upper cooling device comprises at least 1 ramp (30) of nozzles (35), preferably 6 ramps
- the lower cooling device comprises at least 1 nozzle ramp (45), preferably 8 ramps, all producing conical cooling fluid jets (36) and (46) whose axes are substantially normal to the blank (11 ), and whose angle a of the cone of the jets (36) is less than 20 °, preferably the angle of the cone of the jets (36) is substantially 15 °.
- This device has the advantage of being simpler to construct.
- the angle has conical jets of less than 20 °, preferably substantially 15 °, makes it possible to limit the horizontal component of the speed of the cooling fluid during its impact on the blank (11), and consequently to limit runoff cooling fluid on the blank (11) in order to control the cooling thereof.
- the cooling system is preferably used only once so as to reduce the average temperature of the blank (11) from at least 50 ° C to an average temperature above 400 ° C. , in less than 10 seconds, preferably in less than 8 seconds for a blank (11) with a thickness of at most 114 mm as shown in FIG. 19.
- a thicker blank by 50 ° C by reducing the speed of passage of the blank (11) or by increasing the length of the sprayed surfaces (51) and (61).
- a 140mm blank (11) can be cooled to 50 ° C in at least 15 seconds, preferably at least 10 seconds as shown in Figure 20.
- This formula is an approximation which requires in particular that the surface of the blank (11) remains above the Leidenfrost temperature.
- the range of thickness of the blank (11) for the application of said formulas has a minimum of 25mm, preferably 50, preferably 75mm, preferably 100mm, preferably 110mm and a maximum of 200mm, preferably 175mm, preferably 150mm, preferably 140mm , preferably 130mm, preferably 125mm, preferably 120mm.
- a third preferred embodiment is a method of rolling an aluminum alloy of the AA6xxx series comprising the steps: a. casting of a AA6xxx series alloy rolling plate, b. homogenization of the rolling plate, optionally followed by reheating, c. first hot rolling to transform the rolling plate into a blank having a first exit thickness from a first hot rolling start temperature, d.
- the first hot rolling and the cooling are preferably carried out with a reversible hot rolling mill according to the invention.
- the cooling system is preferably used only once so as to preferentially reduce the average temperature with a typical average rate of cooling from the average temperature of the blank of at least 50 ° C up to at an average temperature above 400 ° C.
- the range of thickness of the blank during this cooling has a minimum of 25mm, preferably 50, preferably 75mm, preferably 100mm, preferably 110mm and a maximum of 200mm, preferably 175mm, preferably 150mm, preferably 140mm, preferably 130mm, preferably 125mm, preferably 120mm.
- the cooling system is preferably used only once so as to reduce the average temperature of the blank by at least 50 ° C to at an average temperature above 400 ° C, in less than 10 seconds, preferably in less than 8 seconds for a blank (11) with a thickness of at most 114mm.
- the inventors have surprisingly found that this process makes it possible to improve productivity while retaining mechanical properties, surface quality and corrosion resistance at least equal to those obtained without the process according to the invention. These products can be particularly useful in the automotive industry, in particular for producing exterior body parts.
- the preferred alloys are AA6005, AA6009, AA6013, AA6014, AA6016, AA6022, AA6056, AA6061, AA6111, AA6181, AA6216, AA6316, AA6451, AA6501, AA6502, AA6603, AA6605, AA6607.
- the composition of the alloy plate of the AA6xxx series is an alloy comprising, in% by weight: Si: 0.5 - 0.8; Mg: 0.3 - 0.8; Cu: maximum 0.3; Mn: maximum 0.3; Fe maximum 0.5; Ti: maximum 0.15, remains in aluminum and the inevitable impurities 0.05 maximum each and 0.15 their totality, and preferably Si: 0.6 - 0.75; Mg: 0.5 - 0.6; Cu: maximum 0.1; Mn maximum 0.1; Fe 0.1 - 0.25; Ti: maximum 0.05, remains in aluminum and the inevitable impurities 0.05 maximum each and 0.15 their totality.
- the composition of the alloy plate of the AA6xxx series is an alloy comprising, in% by weight: Si 0.7 - 1.3; Mg : 0.1 - 0.8; Cu: maximum 0.3; Mn: maximum 0.3; Fe maximum 0.5; Ti: maximum 0.15, remains in aluminum and the inevitable impurities 0.05 maximum each and 0.15 their totality, and preferably Si: 0.8 - 1.1; Mg: 0.2 - 0.6; Cu: maximum 0.1; Mn maximum 0.2; Fe 0.1 - 0.4; Ti: maximum 0.1, remains in aluminum and the inevitable impurities 0.05 maximum each and 0.15 their totality.
- the plate is preferably homogenized at a temperature between 500 and 570 ° C., And preferably between 540 and 560 ° C, typically for a period of at least 4 hours, and preferably for at least 8 hours.
- the maximum temperature of the homogenization is at most 555 ° C. Homogenization can be in one step or in several steps with increasing temperatures to decrease the risk of burns.
- the plate is then rolled into a blank during a first hot rolling on a reversible rolling mill.
- the start of rolling temperature of the first hot rolling is preferably above 470 ° C, more preferably above 490 ° C, and even more preferably above 500 ° C.
- the temperature is maintained above 450 ° C, preferably above 470 ° C and more preferably above 490 ° C.
- the first outlet thickness is between 90mm and 140mm, preferably between 100 and 130mm, and more preferably between 110mm and 120mm.
- This thickness of the blank is particularly advantageous in factories where the hot rolling train is made up of successively two reversible hot rolling mills and optionally a tandem hot rolling mill. Indeed, this blank thickness corresponds to the thickness of the blank during its transfer between the first reversible rolling mill and the second reversible rolling mill. Cooling can then be done without any loss of time.
- the blank is then cooled at a cooling rate of at least 5 ° C / s from the average temperature of the blank to a second temperature for the start of the second hot rolling.
- the first hot rolling and the cooling are carried out with a reversible hot rolling mill according to the invention, as illustrated in particular by FIGS. 12 to 15.
- the blank is rolled with a second hot rolling into a strip.
- the second hot rolling can be carried out successively on several hot rolling mills, for example a second reversible hot rolling mill followed by a tandem rolling mill or on the reversible hot rolling mill which was used for the first hot rolling followed by a tandem rolling mill.
- the start temperature of the second hot rolling is between 380 and 450 ° C, more preferably between 400 and 440 ° C, and more preferably between 420 and 435 ° C.
- the strip is rolled to a final hot-rolled thickness under conditions such that the strip after cooling is recrystallized to at least 50%, preferably at least 80%, and more preferably at least 90%, and particularly preferably at least 98%.
- a recrystallization of at least 50%, 80%, 90% and 98% respectively means that the rate of recrystallization measured through the thickness and in at least 3 points of the width is respectively at least 50%, 80 %, 90% and 98%.
- recrystallization varies across thickness and can be complete at the surface and incomplete at mid thickness. The preferred rate of recrystallization depends on the alloy of the strip.
- the outlet temperature of the second hot rolling is at least 345 ° C, preferably at least 350 ° C and more preferably at least 355 ° C.
- the reduction in thickness during the last pass of the second rolling is a parameter to ensure recrystallization. Said reduction of the last pass of the second hot rolling is at least 25%, preferably at least 30%, preferably 40%, and more preferably at least 45%.
- the typical thickness of the strip obtained with the second hot rolling is between 4 and 10mm. The strip is then cold rolled into a thin sheet. With the method of the invention, it is not necessary to carry out an annealing and / or a solution between the hot rolling and the cold rolling or during cold rolling to obtain the mechanical properties, formability, surface condition or corrosion.
- annealing and / or dissolving is not carried out between the hot rolling and the cold rolling or during cold rolling.
- the thin sheet has a thickness typically between 0.5 and 2mm.
- the cold rolling reduction is between 70% and 80%.
- the reduction rate between the strip and the thin sheet is at least 80% to obtain for the most advantageous surface quality.
- an additional step can be carried out g: dissolving and quenching the thin sheet thus obtained in a continuous heat treatment furnace.
- Said continuous heat treatment furnace preferably operates in such a way that the holding time equivalent to 560 ° C, t
- a pre-tempering is optionally carried out, and the mature thin sheet at room temperature, so as to reach the metallurgical state T4, is cut and shaped until get its final shape, is painted and cured by baking
- the thin sheet after solution treatment in a continuous heat treatment furnace operating in such a way that the holding time equivalent to 560 ° C, , is less than 20 s, the equivalent holding time being calculated using the equation time years e oven
- the thin sheet obtained from cold rolling is particularly advantageous if only because it is easy to process by dissolving.
- the conventional ranges aimed at obtaining a good surface condition, compatible with a quality for the exterior bodywork sheets generally include an additional heat treatment during the transformation range with respect to the sheet obtained according to the invention.
- This additional heat treatment means that those skilled in the art need to use high temperatures and long equivalent holding times on the dissolution treatment lines with continuous annealing in order to obtain sufficiently high mechanical strengths. in metallurgical conditions as supplied and with after curing paints.
- the cold rolled thin sheet of the invention can use a dissolving treatment in a continuous annealing line operating in such a way that the holding time equivalent to 560 ° C, t gq ° ° , is short, typically less than 25s, the equivalent holding time being calculated using the equation
- the continuous annealing line operates in such a way that the heating rate of the thin sheet is greater than or equal to 10 ° C / s for a metal temperature below 400 ° C, the time spent at more than 530 ° C is between 15s and 90s, and the quenching speed is greater than or equal to 10 ° C / s, preferably greater than or equal to 15 ° C / s for a thickness of 0.9 to 1.1mm.
- the dissolving treatment causes the metal to reach a temperature below but close to the temperature of the solidus, namely generally above 530 ° C and below 570 ° C.
- the winding temperature after the solution treatment is preferably between 50 ° C and 90 ° C, and preferably between 60 ° C and 80 ° C.
- the thin sheet can age so as to reach the metallurgical state T4, before being cut and shaped until it obtains its final geometry, painted and hardened by baking.
- the method of the invention is particularly useful for the manufacture of thin sheets intended for the automotive industry which combine a high tensile yield strength and a formability suitable for cold stamping operations, thus that excellent surface quality on part and high corrosion resistance with high productivity.
- the hot rolling mill combines the first preferred embodiment and the second embodiment.
- FIG. 15 A non-limiting example is given in FIG. 15.
- the hot rolling mill is surrounded by cooling systems which make it possible to improve its productivity.
- a third cooling system allows rapid cooling during transfer to the subsequent hot rolling.
- This fourth embodiment makes it possible to combine the gain in productivity on the reversible hot rolling mill, rapid cooling without any impact on productivity during the transfer to the rest of the rolling process, the assembly making it possible to provide sheets of AA6xxx alloy with good surface quality and improving the productivity of the solution and quench lines. Examples
- a reversible hot rolling mill according to the invention illustrated in FIG. 7 comprises two cooling systems installed on either side of the working rolls in a symmetrical manner.
- Each of these two cooling systems consists of an upper cooling device and a lower cooling device.
- the upper cooling device comprises a ramp (30) of nozzles (35) oriented towards the cylinder (21). Each upper nozzle ramp is protected by a protective piece (37).
- the lower cooling device comprises two ramps (40) of lower nozzles (45) installed below the plane of the axes of the rollers (23); a first ramp (40) between the first roller (23) from the cylinder (22) and the second roller (23), and the second ramp (40) of nozzles (45) between the second and the third roller (23) .
- the rollers (23) are close enough not to require the installation of a protective part (47).
- Nozzles (35) and (45) produce full conical jets by spraying.
- the nozzles (45) produce conical jets which are almost tangent to the rollers (23).
- the nozzles (35) and (45) are supplied by fast response valves with a response time of 0.2s.
- the convex envelope of the upper sprayed surface is substantially opposite the convex envelope of the lower sprayed surface. Said convex envelopes are within 3 diameters of the larger of the two working rolls of the hot reversible rolling mill.
- the average surface flow per surface is approximately 1200 l / min / m 2 .
- the cooling fluid is the emulsion of the rolling mill which serves to lubricate the blank (11) during its hot rolling.
- the cooling fluid is in heating on the surface of the blank (11).
- FIG. 18 shows the thermal field on the upper surface of an AA6016 alloy blank of dimensions 2000 mm wide, 50 mm thick and 5000 mm long, just after leaving the last reversible hot rolling pass.
- the heterogeneity of the surface temperature of the blank, including the edges and the ends, is 10 ° C both in the length and in the width.
- FIG. 17 shows the thermal field on the upper surface of the blank obtained with the same dimensions as that presented in FIG. 18 just at the exit of the last reversible hot rolling pass.
- the heterogeneity of surface surface temperature of the blank is 25 ° C. both in length and in width in the absence of the use of the cooling system of the invention.
- cooling the blank during the rolling pattern reduces the amount of waste. 90 second reversible hot rolling cycle time.
- a hot rolling mill according to the invention comprising working rolls (21,22) and a cooling system having six upper ramps (30) of nozzles (35) and eight lower ramps (40) of nozzles (45) is shown in figure Figure 14. It is part of a hot train comprising a second reversible rolling mill comprising work rolls (25,26). These two reversible hot rolling mills are part of a hot train comprising in addition a tandem hot rolling mill.
- the nozzles of the upper ramps (35) are oriented perpendicular to the plane of the blank (11).
- the jets of the upper nozzles (36) are solid conical with a cone angle of substantially 15 °.
- the coolant is the emulsion used to lubricate the working rolls during hot rolling.
- the nozzles (45) of the lower ramps (40) are oriented perpendicularly towards the lower face of the blank (11).
- the jets of the lower nozzles are solid conical with a cone angle of substantially 90 °.
- the sprayed surfaces (52) and (62) are substantially opposite.
- the system is capable of cooling a 114mm thick sheet from a temperature of 470 ° C to an average temperature of 420 ° C in 8 seconds as shown in the graph of figure 19 obtained by numerical simulation. 20 seconds after the start of cooling, the heterogeneity in the thickness of the blank is about 9 ° C, and 30 seconds after the start of cooling, the heterogeneity in the thickness of the blank is about 2 ° C.
- Examples D and E which are 114 and 109mm AA6xxx series alloy blanks, were cooled with the system without special adjustment to have hotter edges or ends.
- the temperatures mentioned in Table 1 are measurements taken at the surface of the blanks.
- the surface temperatures of the blanks D and E are representative of the average temperature of said blanks as well as the core temperatures. Sheets D and E were therefore cooled to 57 and 75 ° C. Table 1 Five plates whose compositions are given in Table 1 in% by weight were cast. Table 1 also details the transformation process. Columns A and B describe a plate and its transformation steps into blank then strip then thin sheet to produce internal bodywork elements that have no requirement in terms of surface quality. Column C describes a plate and its typical transformation steps into blank then strip then thin sheet to produce external bodywork elements which have high demands in terms of surface quality.
- the blanks A, B and C passed through the cooling system without being sprayed, and only underwent natural cooling in air during their transfer to the second reversible hot rolling mill.
- the blanks D and E passed through the cooling system in operation and were therefore cooled to the surface temperature indicated in Table 1.
- the 5 blanks were then rolled with the second reversible hot rolling mill, then with a rolling mill. hot tandem in a strip. On leaving the hot tandem rolling mill, the strips were wound according to the characteristics in Table 1. After cooling, the 5 coils were cold rolled into thin sheets. Samples of bands C, D and E were taken after the last hot rolling pass and before winding. These samples were cooled rapidly by immersing them in a pan of water at room temperature.
- the quality of the surface finish in line (roping) was characterized on thin sheets A, B, D and E.
- the line was measured as follows. A sample measuring approximately 270 mm (in the direction transverse to the rolling direction) by 50 mm (in the direction of rolling) is cut from the thin sheet. A pre-strain by tension of 15%, perpendicular to the direction of rolling, that is to say in the direction of the length of the sample, is then applied. The sample is then subjected to the action of abrasive paper type P800 to reveal the lineage
- the thin sheets D and E produced according to the invention, have a surface quality in accordance with the production of external bodywork elements as shown in figure 23 for the thin sheet D and in figure 24 for the thin sheet E. This is not This is not the case with thin sheets A and B as shown in figure 21 for thin sheet A and in figure 22 for thin sheet B.
- the cooling system demonstrates its usefulness in obtaining surface quality with a more economical process by eliminating reheating as for thin sheet C, not specifically characterized in surface quality, which is used to produce external body parts.
- each measured elastic limit (T6YS) is normalized with the elastic limit obtained for the same thin sheet. after a solution time of 90 seconds in the fluidized bed at 570 ° C (T6YSmax).
- FIG. 26 shows that the kinetics of dissolving the two thin sheets D and E according to the invention is much faster than that of comparative Example C. Indeed, after an immersion of 50 s in the fluidized bed at 570 ° C, the elastic limit in state T6 of Examples D and E according to the invention has reached more than 99% of its maximum elastic limit at state T6, while Comparative Example C is just greater than 98% of its maximum yield strength in state T6.
- the elastic limit in state T6 of Examples D and E according to the invention has reached more than 98% of its elastic limit.
- maximum in state T6 while Comparative Example C is at 96% of its maximum yield strength in state T6. Therefore, the invention also makes it possible to accelerate the productivity of the solution.
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JP2022574668A JP2023528070A (ja) | 2020-06-04 | 2021-06-02 | リバース熱間圧延機上での冷却方法および設備 |
US18/000,449 US20230219125A1 (en) | 2020-06-04 | 2021-06-02 | Method and equipment for cooling on a reversing hot rolling mill |
CN202180039894.3A CN115702048A (zh) | 2020-06-04 | 2021-06-02 | 可逆式热轧机的冷却方法和设备 |
MX2022014448A MX2022014448A (es) | 2020-06-04 | 2021-06-02 | Metodo y equipo de enfriamiento en un laminador reversible en caliente. |
BR112022023731A BR112022023731A2 (pt) | 2020-06-04 | 2021-06-02 | Processo e equipamento de resfriamento sobre um laminador reversível a quente |
KR1020227046274A KR20230020447A (ko) | 2020-06-04 | 2021-06-02 | 가역 열간 압연기에서의 냉각을 위한 방법 및 장비 |
CA3180404A CA3180404A1 (fr) | 2020-06-04 | 2021-06-02 | Procede et equipement de refroidissement sur un laminoir reversible a chaud |
EP21737701.9A EP4161714A1 (fr) | 2020-06-04 | 2021-06-02 | Procede et equipement de refroidissement sur un laminoir reversible a chaud |
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US202063034845P | 2020-06-04 | 2020-06-04 | |
US63/034,845 | 2020-06-04 | ||
FR2007191A FR3112297B1 (fr) | 2020-07-07 | 2020-07-07 | Procédé et équipement de refroidissement sur un Laminoir réversible à chaud |
FRFR2007191 | 2020-07-07 | ||
FR2012174A FR3112296B1 (fr) | 2020-07-07 | 2020-11-26 | Procédé et équipement de refroidissement sur un Laminoir réversible à chaud |
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EP (1) | EP4161714A1 (fr) |
JP (1) | JP2023528070A (fr) |
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CN114672627A (zh) * | 2022-03-21 | 2022-06-28 | 东北大学 | 热处理强化铝合金板的对称约束辊式淬火装置及淬火方法 |
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WO2015058902A1 (fr) | 2013-10-25 | 2015-04-30 | Sms Siemag Ag | Train de laminage à chaud de bandes d'aluminium et procédé de laminage à chaud d'une bande d'aluminium |
WO2016012691A1 (fr) | 2014-07-23 | 2016-01-28 | Constellium Neuf-Brisach | Procédé et équipement de refroidissement |
EP2979769A1 (fr) | 2013-03-27 | 2016-02-03 | JFE Steel Corporation | Dispositif et procédé de fabrication d'une tôle d'acier épaisse |
EP2991783A1 (fr) | 2013-05-03 | 2016-03-09 | SMS group GmbH | Procédé de fabrication d'une bande métallique |
US20160201158A1 (en) | 2015-01-12 | 2016-07-14 | Novelis Inc. | Highly formable automotive aluminum sheet with reduced or no surface roping and a method of preparation |
WO2018011245A1 (fr) | 2016-07-14 | 2018-01-18 | Constellium Neuf-Brisach | Procédé de fabrication de tôles d'aluminium 6xxx |
WO2019241514A1 (fr) | 2018-06-13 | 2019-12-19 | Novelis Inc. | Systèmes et procédés de trempe d'une bande métallique après laminage |
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2021
- 2021-06-02 JP JP2022574668A patent/JP2023528070A/ja active Pending
- 2021-06-02 BR BR112022023731A patent/BR112022023731A2/pt unknown
- 2021-06-02 US US18/000,449 patent/US20230219125A1/en active Pending
- 2021-06-02 WO PCT/FR2021/051002 patent/WO2021245355A1/fr active Application Filing
- 2021-06-02 CA CA3180404A patent/CA3180404A1/fr active Pending
- 2021-06-02 KR KR1020227046274A patent/KR20230020447A/ko unknown
- 2021-06-02 CN CN202180039894.3A patent/CN115702048A/zh active Pending
- 2021-06-02 EP EP21737701.9A patent/EP4161714A1/fr active Pending
- 2021-06-02 MX MX2022014448A patent/MX2022014448A/es unknown
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US6309482B1 (en) | 1996-01-31 | 2001-10-30 | Jonathan Dorricott | Steckel mill/on-line controlled cooling combination |
EP1165851A1 (fr) | 1999-03-01 | 2002-01-02 | Alcan International Limited | Procede de fabrication d'une feuille d'aluminium aa6000 |
EP1375691A1 (fr) | 2001-03-28 | 2004-01-02 | Sumitomo Light Metal Industries, Ltd. | Feuille en alliage aluminium a aptitude au formage et durcissabilite excellentes au cours de la cuisson de revetement, et procede de production |
WO2008089827A1 (fr) | 2007-01-25 | 2008-07-31 | Sms Siemag Ag | Dispositif pour refroidir une bande métallique |
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EP2991783A1 (fr) | 2013-05-03 | 2016-03-09 | SMS group GmbH | Procédé de fabrication d'une bande métallique |
JP2015067857A (ja) | 2013-09-27 | 2015-04-13 | 株式会社Uacj | 自動車パネル用Al−Mg−Si系アルミニウム合金板及びその製造方法 |
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WO2015058902A1 (fr) | 2013-10-25 | 2015-04-30 | Sms Siemag Ag | Train de laminage à chaud de bandes d'aluminium et procédé de laminage à chaud d'une bande d'aluminium |
WO2016012691A1 (fr) | 2014-07-23 | 2016-01-28 | Constellium Neuf-Brisach | Procédé et équipement de refroidissement |
US20160201158A1 (en) | 2015-01-12 | 2016-07-14 | Novelis Inc. | Highly formable automotive aluminum sheet with reduced or no surface roping and a method of preparation |
WO2018011245A1 (fr) | 2016-07-14 | 2018-01-18 | Constellium Neuf-Brisach | Procédé de fabrication de tôles d'aluminium 6xxx |
WO2019241514A1 (fr) | 2018-06-13 | 2019-12-19 | Novelis Inc. | Systèmes et procédés de trempe d'une bande métallique après laminage |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114672627A (zh) * | 2022-03-21 | 2022-06-28 | 东北大学 | 热处理强化铝合金板的对称约束辊式淬火装置及淬火方法 |
CN114672627B (zh) * | 2022-03-21 | 2022-12-09 | 东北大学 | 热处理强化铝合金板的对称约束辊式淬火装置及淬火方法 |
Also Published As
Publication number | Publication date |
---|---|
CN115702048A (zh) | 2023-02-14 |
BR112022023731A2 (pt) | 2023-04-11 |
JP2023528070A (ja) | 2023-07-03 |
KR20230020447A (ko) | 2023-02-10 |
US20230219125A1 (en) | 2023-07-13 |
MX2022014448A (es) | 2023-01-05 |
EP4161714A1 (fr) | 2023-04-12 |
CA3180404A1 (fr) | 2021-12-09 |
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