EP4039381A1 - Verfahren zur dickenreduzierung eines metallbandes durch warmwalzformen und system zum walzformen eines metallbandes durch warmwalzformen - Google Patents

Verfahren zur dickenreduzierung eines metallbandes durch warmwalzformen und system zum walzformen eines metallbandes durch warmwalzformen Download PDF

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Publication number
EP4039381A1
EP4039381A1 EP21155547.9A EP21155547A EP4039381A1 EP 4039381 A1 EP4039381 A1 EP 4039381A1 EP 21155547 A EP21155547 A EP 21155547A EP 4039381 A1 EP4039381 A1 EP 4039381A1
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EP
European Patent Office
Prior art keywords
metal
strip
thickness
rollers
pair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP21155547.9A
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English (en)
French (fr)
Inventor
Ali Mashi
Khaled Alhajeri
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP21155547.9A priority Critical patent/EP4039381A1/de
Publication of EP4039381A1 publication Critical patent/EP4039381A1/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • 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
    • B21B45/04—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 de-scaling, e.g. by brushing
    • 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
    • B21B45/04—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 de-scaling, e.g. by brushing
    • B21B45/08—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 de-scaling, e.g. by brushing hydraulically

Definitions

  • the present invention relates to and concerns a method for reducing the thickness of a strip of metal by hot-roll-forming.
  • the invention also relates to a system for roll-forming a strip of metal by hot-roll-forming set up to perform an according method.
  • the object of the present invention is to improve the known state of the art.
  • a method for reducing the thickness of a strip of metal by hot-roll-forming wherein the strip of metal comprises a first thickness of 2.0 mm up to 5.0 mm prior to the process and the strip of metal with the first thickness is processed to a strip of metal with second thickness of 0.6 mm to 2.5 mm by at least one pair of rollers, wherein the second thickness is smaller than the first thickness, comprising the following steps:
  • Reducing the thickness of a strip of metal indicates any process suitable for transferring a strip of metal or a piece of sheet metal to a lower thickness during that process of reducing.
  • the reduction of thickness is performed by pushing or pulling the strip of metal or a piece of sheet metal through a pair of rollers or multiple pairs of rollers.
  • a process of "hot-roll-forming” relates to a process in which mentioned strip of metal is formed and/or reduced in thickness by means of rollers or multiple rollers, which is especially done in “hot” condition.
  • This "hot” condition in respect to applicable material science, describes, that the process is performed with the strip of metal being at a temperature which is above or well above recrystallization temperature of that very metal.
  • a “thickness” determines a measurement of that metal strip in one direction, this direction usually being measured between the forming rolls or multiple stages of forming rolls. Such a thickness does not have to be the same for all the strip of metal or the whole piece of sheet metal which is processed, it can also be determined as an average thickness or a representative thickness of this very strip of metal or piece of sheet metal.
  • a "pair of rollers” describes any kind of or any set of rotating and in general round-shaped solid bodies, which by their opposing position are enabled to process the strip of metal or any piece of sheet metal in between of them.
  • Those rollers for example, can be drums or solid metal rollers or any other embodiment in cylindrical or in general cylindrical shape.
  • Those rollers usually are made from a metal or steel or a ceramic material, which is harder than the metal to be processed.
  • Heating the strip of metal describes any raise in temperature of that strip of metal to prepare this strip of metal or the respective piece of sheet metal to be processed above its recrystallization temperature.
  • a heating can be performed by electrical or chemical means, for example, heating the strip of metal with an oven or other suitable means. Also, such a heating can be done by using process heat from any prior process, for example, by introducing the strip of metal in a pre-heated stage from any prior process.
  • a "recrystallization temperature” describes a temperature for any given metal or any given metal compound or alloy, above which its deformed grains are replaced by a new set of defect-free grains that nucleate and grow until the original grains have been partly or entirely consumed. Recrystallization is usually accompanied by a reduction in strength and hardness of a material and a simultaneous increase in the ductility. This recrystallization temperature is related to the very type, kind and/or mixture of metal, for example, defined by the specific alloy of a specific metal which is used.
  • Processing the pre-heated strip of metal through the pair of rollers describes any process that performs the wanted goal, namely to reduce the thickness of the strip of metal by compressing said strip of metal along a thickness axis, in a way that its thickness is reduced by the established force or forces from the rollers towards that strip of metal.
  • the first thickness is between 2.5 mm and 4.5 mm and/or the second thickness is between 1.0 mm and 2.0 mm, in particular between 1.2 mm and 1.8 mm.
  • the process forces needed to perform the process are comparably low.
  • the process can be performed in a way that the second thickness is established for the strip of metal with a high surface quality and specifically low flaws in the material.
  • the first thickness is reduced to the second thickness by a multi-step process, wherein the strip of metal is introduced into and processed by multiple pairs of rollers consecutively.
  • the method can be performed in comparably small-sized machine or device, as the strip of metal is passed through different pairs of rollers to perform different steps of a reduction of its thickness.
  • the multiple pairs of rollers are each adjusted to decreasing distances, thus the multi-step process is realized by each pair of rollers with decreasing distances reducing the thickness of the metal strip in consecutive steps.
  • the multi-step process is performed by a reversing or partly reversing process, wherein the strip of metal is moved back and forth through one pair of rollers or multiple pairs of rollers consecutively.
  • the pair of rollers or pairs of rollers are presented as tandem mills or Steckel-mills.
  • tandem mill describes any system of multi roller mill-stages, wherein such a tandem mill can also comprise multiple stages of rollers, whereas the process is done in one path in multiple steps of thickness.
  • tandem mills can comprise from two up to 18 pairs of rollers.
  • a “Steckel-mill”, also known as a reversible finishing mill, is similar to a reversing roller mill, except two coilers are used to feed the material to the mill. Such a coiler is on the entrance side and another coiler on the exit side. The coilers pull the material through the mill, therefore the process is more similar to drawing than rolling. The material can be fed back and forth through the mill until the desired thickness is reached, much like a reversing roller mill.
  • the strip of metal is de-coiled prior to introducing the metal strip into the pair of rollers or the airs of rollers.
  • the strip of metal can be stored in a relatively small space prior to the process and can be de-coiled in the very moment of introducing into the pair of rollers and, by that, introducing into the process.
  • the strip of metal can be cleaned prior to introducing the metal strip into the pair of rollers or pairs of rollers.
  • This cleaning can be done by mechanically cleaning with, e.g., brushing and/or using high pressure water and/or sand blasting or by using acid, similar to the pickling line in a cold rolling process.
  • the strip of metal is re-coiled prior to processing and/or the strip of metal with a reduced thickness is re-coiled after processing in the pair of rollers for pairs of rollers in a re-coiling device.
  • the heating of the strip of metal is performed by induction, wherein electromagnetic fields are induced in the metal and/or by gas, wherein gas is burned to heat the metal with a flame directly or by heating an oven and/or a heating device for the metal.
  • the strip of metal is cooled after its processing in the pair of rollers or pairs of rollers, especially by water cooling and/or air cooling.
  • This embodiment in all possible combinations, is especially used for controlling the microstructure and mechanical properties of the strip of metal.
  • the objective can be solved by a system for roll-forming a strip of metal by hot-roll-forming comprising at least one pair of rollers for processing the strip of metal comprising a first thickness to a strip of metal with a second thickness, set up to perform a method according to one or more of the embodiments described above.
  • Such a system can successfully be used to produce a strip of metal with a thickness of ⁇ 2.5 mm as described above in a hot-rolling-process, whereas the quality of the produced strip of metal can be comparable to a cold-rolling-process.
  • the system comprises multiple rollers or multiple pairs of rollers, whereas the multiple rollers or multiple pairs of rollers are set up for processing the strip of metal comprising a first thickness to the strip of metal comprising a second thickness in consecutive steps.
  • the system comprises a heating device, whereas the heating device is located in proximity to the strip of metal for heating the strip of metal.
  • the strip of metal can easily be heated to be prepared for the hot-roll-forming-process.
  • the system comprises a cooling device, especially a water-cooling device, whereas the cooling device is located in proximity to the strip of metal for cooling the strip of metal.
  • a “heating device” can be any device or system to heat up the strip of metal.
  • a heating device comprises a torch, a flame, an electric heating system and/or an inductive heating system.
  • a heating device is an oven, an electromagnetic coil or comprises an electromagnetic resistor to convert electrical energy into heat.
  • a “cooling device” can be any device which is suitable for cooling a strip of metal or for introducing a cold environment in proximity to the strip of metal.
  • a cooling device comprises a system for water spray, a heat converter or any other suitable device.
  • a roll-forming-process 101 is performed in a rolling mill 107, comprising a roller 103 and a roller 105.
  • the roll-forming-process 101 is performed as a so-called hot-roll-forming-process, wherein the temperature of a roll-formed metal strip 121 is above the recrystallization temperature of that very metal. In the presented example, this temperature is well above 800 °C, as the metal is a steel.
  • the metal strip 121 comprises an initial part 123, which is roll-formed into a compressed part 125.
  • the initial part 123 comprises a primary thickness 151, which is reduced to a secondary thickness 153 of the compressed part 125 in the process.
  • the primary thickness 151 is 3.5mm
  • the secondary thickness is 1.5mm.
  • a roll-forming-process 201 takes advantage of the rolling mill 107.
  • a metal strip 211 is presented on a primary roll 203, which is pre-heated.
  • a shield 205 prevents an operator touching the metal strip or any other moving parts.
  • the metal strip 211 is rolled around a shaft 207 to form the primary roll 203.
  • the metal 211 is then fed around guiding rollers 221 which lead the metal strip 211 to support rollers 251.
  • the so presented first part 213 of the metal strip 211 is then fed into the roller mill 107.
  • the metal 211 is reduced in its thickness according to the process prior presented.
  • a second part 215 of the metal strip 211 is a result of the roll-forming-process performed in the roller mill 107.
  • the second part 215 comprises a lower thickness than the first part 213 according to the example presented above.
  • the second part 215 of the metal strip 211 is fed onto support rollers 261 and around guiding rollers 223 onto a secondary roll 233.
  • the secondary roll 233 is protected by a shield 235 to prevent an operator from injury or from interfering with the secondary roll 233.
  • the secondary roll 233 is built around a shaft 237 which can actively be driven to pull the metal strip 211 through the roller mill 107.
  • a metal strip 241 with a reduced thickness is drawn onto the secondary roll 233.
  • the process is shown to be performed along a direction 271.
  • the metal strip 211 In between the first primary roll 203 and the secondary roll 233, the metal strip 211, respectively metal strip 241, can be drawn back and forth in between those two rolls. In each step of consecutively moving the metal strip back and forth, a distance of the roller 103 to the roller 105 within the rolling mill 107 can be reduced, thus the thickness of the metal strip is reduced step by step.
  • a metal strip 321 is pre-heated in an oven 303.
  • the oven 303 comprises means to coil and de-coil the metal strip 321 according to the example above.
  • the metal strip 321 is then fed onto a support 305 whereas a primary strip 321 is fed into a reversing roller mill 307 and thereby passively cooled to a suitable processing temperature.
  • the reversing roller mill 307 works according to the above-mentioned example.
  • a secondary strip 325 with a lower thickness than the primary strip 323 is fed onto a support 309 and then into an oven 311.
  • the thickness of the primary strip 323 in this case is 4.0mm, the secondary strip 325 comprises a thickness of 1.8mm.
  • the oven 311 also comprises means to coil and re-coil the metal strip, this way the metal strip 321 can be moved back and forth through the reversing roller mill 307 by the oven 303 and the oven 311. This way, the thickness of the metal strip 321 can be reduced step by step.
  • the secondary strip 325 with this exact thickness can be fed through the oven 311 without re-coiling, thus feeding the metal strip 321 onto a support 313 with a cool waterspray 314 to cool the metal strip. After cooling the metal strip, it is fed onto a coiling device 315, in which the metal strip is re-coiled for further processing or transportation.
  • a schematic flow of a process 401 for hot-roll-forming a strip of metal is described as follows:
  • heating 403 of the metal strip is performed.
  • introducing 405 of the metal strip into a hot-roll-forming-process takes places.
  • processing 407 a hot-roll-forming-process is performed, thus a strip of metal with a reduced thickness is presented.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
EP21155547.9A 2021-02-05 2021-02-05 Verfahren zur dickenreduzierung eines metallbandes durch warmwalzformen und system zum walzformen eines metallbandes durch warmwalzformen Withdrawn EP4039381A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21155547.9A EP4039381A1 (de) 2021-02-05 2021-02-05 Verfahren zur dickenreduzierung eines metallbandes durch warmwalzformen und system zum walzformen eines metallbandes durch warmwalzformen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21155547.9A EP4039381A1 (de) 2021-02-05 2021-02-05 Verfahren zur dickenreduzierung eines metallbandes durch warmwalzformen und system zum walzformen eines metallbandes durch warmwalzformen

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EP4039381A1 true EP4039381A1 (de) 2022-08-10

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EP21155547.9A Withdrawn EP4039381A1 (de) 2021-02-05 2021-02-05 Verfahren zur dickenreduzierung eines metallbandes durch warmwalzformen und system zum walzformen eines metallbandes durch warmwalzformen

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5419172A (en) * 1993-07-26 1995-05-30 Kim; Yong-Wu Continuously cast carbon and stainless steel hot-rolling mill
EP2580001A2 (de) * 2010-06-14 2013-04-17 Danieli & C. Officine Meccaniche SpA Walzanlage und zugehöriges verfahren
CN109881083A (zh) * 2018-06-08 2019-06-14 江苏沙钢集团有限公司 一种薄带铸轧700MPa级耐候钢及其生产方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5419172A (en) * 1993-07-26 1995-05-30 Kim; Yong-Wu Continuously cast carbon and stainless steel hot-rolling mill
EP2580001A2 (de) * 2010-06-14 2013-04-17 Danieli & C. Officine Meccaniche SpA Walzanlage und zugehöriges verfahren
CN109881083A (zh) * 2018-06-08 2019-06-14 江苏沙钢集团有限公司 一种薄带铸轧700MPa级耐候钢及其生产方法

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