CA2469073C - Method and device for controlled straightening and cooling of wide metal strip, especially steel strip or sheet, running out of a hot-rolled strip mill - Google Patents
Method and device for controlled straightening and cooling of wide metal strip, especially steel strip or sheet, running out of a hot-rolled strip mill Download PDFInfo
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- CA2469073C CA2469073C CA2469073A CA2469073A CA2469073C CA 2469073 C CA2469073 C CA 2469073C CA 2469073 A CA2469073 A CA 2469073A CA 2469073 A CA2469073 A CA 2469073A CA 2469073 C CA2469073 C CA 2469073C
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- strip
- metal strip
- straightening
- pinching
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- 238000001816 cooling Methods 0.000 title claims abstract description 104
- 239000002184 metal Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 title abstract description 14
- 239000010959 steel Substances 0.000 title abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims description 25
- 230000033228 biological regulation Effects 0.000 claims description 5
- 230000000750 progressive effect Effects 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
-
- 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
- C21D8/0242—Flattening; Dressing; Flexing
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0252—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with application of tension
-
- 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
- C21D1/667—Quenching devices for spray quenching
-
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Metal Rolling (AREA)
- Control Of Heat Treatment Processes (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
A method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip (1) or sheet metal, running out of a hot rolled strip rolling mill, using pinching rollers (5) arranged in the moving direction of the strip (2) behind vertical double rollers (3,4), said pinching rollers producing a tensile stress (6) acting in a longitudinal direction. According to the invention, the range of use of conventional sheet metal cooling systems can be extended to obtain a more even surface of said steel strip (1) with an increased cooling effect. This is achieved by displacing the metal strip (1) or sheet metal between a pre-straightening machine (7) and splash cooling facility (8) in defined conditions of tensile stress (6) by adjusting the tensile stress (6) and by cooling said strip or sheet metal inside said splash cooling facility (8) between successive pairs (5a) of pinching rollers and by additionally controlling the tensile stress (6).
Description
TRANSLATION (HM-585PCT-original):
WO 03/054,236 Al PCT/EP02/13,035 METHOD AND DEVICE FOR CONTROLLED STRAIGHTENING AND COOLING
OF WIDE METAL STRIP, ESPECIALLY STEEL STRIP OR SHEET, RUNNING OUT OF A HOT-ROLLED STRIP MILL
The invention concerns a method and device for controlled straightening and cooling of wide metal strip, especially steel strip or sheet, running out of a hot-rolled strip mill, with the use of pinch rolls, which are installed after (in the direction of strip flow) vertical double rolls and produce a tensile stress that acts in the longitudinal direction.
The method and device described above are basically known from DE 33 13 024 Al, which discloses a method and a device for quenching passing steel sheet, especially heavy and medium sheet, with simultaneous controlled straightening, in which the sheet, before being quenched, is straightened in a plane while hot by at least two vertical double rolls arranged one behind the other. The sheet is then drawn through a quenching installation under controlled tensile stress by at least one double roll. This method is designed to quench passing steel sheet exactly to the predetermined mechanical properties without the development of warpage or distortion and at the same to reduce roughness that is already present. Despite these measures, inadequate flatness of the sheet continues to occur due to inadequate application of tensile stress, unfavorable cooling, and other unfavorable control measures. The cooling devices used in practice, which consist essentially of nozzle units or, for the aftercooling, of laminar water curtains, cannot really be improved any further. In principle, a U-tube is used for laminar cooling units. Of course, the highest attainable cooling intensities are obtained with nozzles and suitably selected parameters. The poor automatic control and regulation behavior is a disadvantage in general and at low flow rates in particular.
The objection of some embodiments of the invention is to extend the range of application of conventional sheet cooling systems to obtain greater flatness of the sheet with an increased cooling effect.
In accordance with some embodiments of the invention, this objective may be achieved by moving the metal strip or sheet between a pre-straightening machine and a splash cooling installation under defined conditions of tensile stress by adjustment of the tensile stress and by cooling the metal strip or sheet inside the splash cooling installation between successive pairs of pinch rolls and additionally controlling the tensile stress.
This directly produces plastic deformation before the metal strip or sheet passes into the cooling installation. The plastic deformation improves the flatness of the entering metal strip or sheet. Another advantage is gained by the arrangement of the straightening process immediately before the cooling, which prevents renewed buildup of internal stresses and deformations due to the nonuniform cooling on the surface of the metal strip or sheet.
The cooling effect is practically limited by the induction of stresses and deformations associated with these stresses in the sheet due to the nonuniform cooling effect of the cooling medium (water) on the surface of the sheet. This (unfavorable) effect occurs especially with the use of a relatively high cooling intensity on sheets that are thin and at the same time wide. The critical product of a plant is defined by a sheet with the least thickness at the maximum width and at the same time high intensity of the cooling. The intensity of the cooling is defined by a high temperature difference between the initial and final cooling temperature using a short cooling time. In practice, pinch rolls are intended to hinder this deformation effect. However, the effect of this form of compensation is limited. The arrangement of the pre-straightening machine before the cooling installation in accordance with the invention brings about plastic deformation and reduces entry deformations and stresses directly before the cooling installation.
The deformations on entry into the cooling installation can be combated especially effectively by adjusting the tensile stress by switching the speed to the respective next or last supporting pinch roll with progressive passage of the metal strip or sheet.
In one embodiment, the pinch rolls are set with a spacing such that a cooling unit is formed between two rolls, depending on the spacing.
In a refinement of the invention, this spacing can be adjusted to a half-length of the resulting characteristic form for a strip or sheet with the least thickness, at maximum width and high cooling intensity.
The device for the controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet, running out of a hot-rolled strip mill is equipped with vertical pairs of double rolls and pairs of pinch rolls which follow them (in the direction of strip flow), between each of which a cooling unit is installed.
In accordance with some embodiments of the invention, the stated objective may be achieved with a device of this type by installing a pre-straightening machine before the pairs of pinch rolls with the cooling units, between which a controlled tensile stress can be produced. This makes it possible to transmit a tensile force even before the cooling, so that the magnitude of the deformations that are present is already reduced here. An even more exact determination of the tensile stresses inside the cooling units then occurs.
In accordance with other features, the cooling units are each designed for a high and an intermediate cooling intensity.
The effect of the cooling can be increased still further by providing the cooling unit with finely adjustable cooling elements at the outlet of the metal strip.
The cooling can be further developed in such a way that the cooling unit is designed for a high and/or an intermediate cooling intensity in accordance with a predetermined product spectrum.
Some embodiments of the invention can be further improved by also making it possible to produce tensile stresses between the last, supporting pinch rolls or the straightening rolls at the trailing end of the metal strip or sheet and the pinch rolls or the straightening rolls at the leading end of the metal strip or sheet.
According to one aspect of the present invention, there is provided a method for controlled straightening and cooling of a wide metal strip running out of a hot strip rolling mill, the method comprising: guiding the metal strip through a splash cooling installation comprising a first cooling unit between a double roller, which comprises two individual rollers arranged vertically one above the other;
and at least one pinching roller pair arranged subsequent to the double roller in strip running direction; wherein a tensile stress is produced in a longitudinal direction in the metal strip between the double roller and the at least one pinching roller pair; wherein prior to entry into the double roller without use of a cooling unit, running the metal strip through a pre-straightening machine with straightening rollers and associated rotary drive motors, which places the metal strip under defined tensile stresses by regulation of the rotary drive motors for the straightening rollers of the pre-straightening machine.
According to another aspect of the present invention, there is provided an apparatus for controlled straightening and cooling of a wide metal strip, running out of a hot-strip rolling mill, comprising: a splash cooling installation with a double roller having two individual rollers arranged vertically one above the other, at least one pinching roller pair arranged subsequent to the double rollers in strip running direction and a first cooling unit arranged between the double roller and the at least one pinching roller pair; wherein a tensile stress is provided in a longitudinal direction in the metal strip when it is guided through the splash cooling installation between the double roller and the at least one pinching roller pair, a pre-straightening machine, which is upstream of the splash cooling installation with straightening rollers and associated rotary drive motors adapted to, under defined tensile stresses by regulation of the rotary drive motors of the straightening rollers of the pre-straightening machine, move the metal strip, between the pre-straightening machine and the double roller without cooling.
The embodiments of the invention illustrated in the drawings are explained in greater detail below.
-- Figure 1 shows a system diagram of the cooling with pinch rolls and of the drive control with the tensile stresses produced.
-- Figure 2A shows a perspective view of the steel strip or sheet with distortions in the form of center waviness.
-- Figure 2B shows a side view of two pairs of pinch rolls arranged with a certain spacing distance.
-- Figure 3 shows the arrangement of the cooling devices for the given cooling intensity.
-- Figure 4 shows a view of a total installation for straightening and cooling.
6a The metal strip, especially the steel strip 1 or sheet, is conveyed by a tensile stress 6 acting in the longitudinal direction (strip flow direction 2) for controlled cooling and straightening with the use of pinch rolls 5 arranged after (in the direction of strip flow 2) vertical double rolls 3 and 4.
In the process, the metal strip 1 is moved between a pre-straightening machine 7 and a splash cooling installation 8 under defined conditions of tensile stress 6 by adjustment of the tensile stress (by the straightening roll rotational drive motors). The metal strip 1 is then cooled inside the splash cooling installation between successive pairs of pinch rolls 5a, and the tensile stress is additionally controlled. The splash cooling installation 8 comprises cooling units 9 installed between each two pairs of pinch rolls 5a (Figure 1). While the metal strip 1 is entering at roller table speed 10, the tensile stress 6 is controlled via a suitable torque 11 by a feedback control system 12, which is designated (A) action of the pinch rolls 5 (i) to (i + nc). As soon as the trailing end la of the strip passes through, which is designated (B) action of the pinch rolls 5 (i) to (i + nc), suitable tensile stress is transmitted to the trailing end la of the strip, and only the comparison speed is still measured beyond the end la of the strip without using the feedback control system 12. Both for the trailing end la of the strip and the leading end lb of the strip, the tensile stress 6 is adjusted by switching the speed to the respective next or last supporting pinch roll 5 with progressive passage of the metal strip (see Figure 1).
The pinch rolls 5 are installed with a certain spacing 13, such that the cooling unit 9 is formed between two pinch rolls 5, depending on the spacing 13. For example, the spacing 13 can be based on a half-length 14 of the resulting wavelength 15 for a metal strip with the least thickness, at maximum width and high cooling intensity. The typical wavelength 15 develops in the steel strip 11 (Figure 2A).
The cooling units are each designed for a high or an intermediate cooling intensity (Figure 2B), such that the spacing 13 corresponds to the half wavelength 15 (cf. Figure 2B). The behavior of the wave 16 is clearly shown by the dotted lines 17 in Figures 2A and 2B.
Figure 3 shows the cooling effect of the different individual types of cooling devices 9. In the graph of temperature as a function of time, the solid curve represents the behavior of the temperature 20 in the center of the strip or sheet, and the broken curve represents the surface temperature 21. Splash cooling units 8a are used in the sections (1).
Cooling units 9, which consist of U-tube units 22, are provided at the outlet 18 of the steel strip 1.
On the basis of the temperature AT-center (1), the temperature in the center of the steel strip 1 or the temperature AT-center (2) is reached.
The temperature AT-surface is reached while still in the zone of the splash cooling units 8a. When the U-tube units 22 are used, the necessary cooling stop temperature is attained in small increments by the U-tube units 22. Martensite formation by surface subcooling is prevented above the temperature T-martensite.
Tensile stresses 6 can be produced in the same procedure between the last supporting pinch rolls 5 or straightening rolls 23 at the trailing end la of the metal strip 1 or sheet and the pinch rolls 5 or the straightening rolls 24 at the leading end lb of the metal strip 1.
Figure 4 shows a complete installation, in which, in the direction of strip flow 2, the pre-straightening machine 7 is followed by the splash cooling installation 8 with the pairs of pinch rolls 5a and the cooling units 9 and then by a laminar cooling installation 25.
List of Reference Numbers 1 metal strip, steel strip or sheet la trailing end of the strip lb leading end of the strip 2 direction of strip flow 3 double roll 4 double roll pinch roll 5a pair of pinch rolls 6 tensile stress 7 pre-straightening machine 8 splash cooling 8a splash cooling units 9 cooling unit roller table speed 11 torque 12 feedback control system 13 spacing 14 half-length resulting wavelength 16 wave behavior 17 dotted line 18 outlet 19 cooling element 20 strip or sheet center 21 surface temperature 22 U-tube units 23 straightening roll 24 straightening roll 25 laminar cooling installation Figure 1.
KEY:
Quetsch-Rolle = pinch roll K{hleinheit = cooling unit Eingriff der Quetsch-Rollen (i) bis (i + nc) = action of the pinch rolls (i) to (i + nc) Zugspannung = tensile stress Rollgangsgeschwindigkeit = roller table speed Drehmoment = torque Ruckmeldungs-Regelung = feedback control system Nur Vergleichs-Geschwindigkeit, Keine Ruckmeldungssteuerung =
only comparison speed, no feedback control Figure 3.
KEY:
Temperatur = temperature Mitte = center Oberflache = surface T-Martensit = T-martensite Zeit = time.
WO 03/054,236 Al PCT/EP02/13,035 METHOD AND DEVICE FOR CONTROLLED STRAIGHTENING AND COOLING
OF WIDE METAL STRIP, ESPECIALLY STEEL STRIP OR SHEET, RUNNING OUT OF A HOT-ROLLED STRIP MILL
The invention concerns a method and device for controlled straightening and cooling of wide metal strip, especially steel strip or sheet, running out of a hot-rolled strip mill, with the use of pinch rolls, which are installed after (in the direction of strip flow) vertical double rolls and produce a tensile stress that acts in the longitudinal direction.
The method and device described above are basically known from DE 33 13 024 Al, which discloses a method and a device for quenching passing steel sheet, especially heavy and medium sheet, with simultaneous controlled straightening, in which the sheet, before being quenched, is straightened in a plane while hot by at least two vertical double rolls arranged one behind the other. The sheet is then drawn through a quenching installation under controlled tensile stress by at least one double roll. This method is designed to quench passing steel sheet exactly to the predetermined mechanical properties without the development of warpage or distortion and at the same to reduce roughness that is already present. Despite these measures, inadequate flatness of the sheet continues to occur due to inadequate application of tensile stress, unfavorable cooling, and other unfavorable control measures. The cooling devices used in practice, which consist essentially of nozzle units or, for the aftercooling, of laminar water curtains, cannot really be improved any further. In principle, a U-tube is used for laminar cooling units. Of course, the highest attainable cooling intensities are obtained with nozzles and suitably selected parameters. The poor automatic control and regulation behavior is a disadvantage in general and at low flow rates in particular.
The objection of some embodiments of the invention is to extend the range of application of conventional sheet cooling systems to obtain greater flatness of the sheet with an increased cooling effect.
In accordance with some embodiments of the invention, this objective may be achieved by moving the metal strip or sheet between a pre-straightening machine and a splash cooling installation under defined conditions of tensile stress by adjustment of the tensile stress and by cooling the metal strip or sheet inside the splash cooling installation between successive pairs of pinch rolls and additionally controlling the tensile stress.
This directly produces plastic deformation before the metal strip or sheet passes into the cooling installation. The plastic deformation improves the flatness of the entering metal strip or sheet. Another advantage is gained by the arrangement of the straightening process immediately before the cooling, which prevents renewed buildup of internal stresses and deformations due to the nonuniform cooling on the surface of the metal strip or sheet.
The cooling effect is practically limited by the induction of stresses and deformations associated with these stresses in the sheet due to the nonuniform cooling effect of the cooling medium (water) on the surface of the sheet. This (unfavorable) effect occurs especially with the use of a relatively high cooling intensity on sheets that are thin and at the same time wide. The critical product of a plant is defined by a sheet with the least thickness at the maximum width and at the same time high intensity of the cooling. The intensity of the cooling is defined by a high temperature difference between the initial and final cooling temperature using a short cooling time. In practice, pinch rolls are intended to hinder this deformation effect. However, the effect of this form of compensation is limited. The arrangement of the pre-straightening machine before the cooling installation in accordance with the invention brings about plastic deformation and reduces entry deformations and stresses directly before the cooling installation.
The deformations on entry into the cooling installation can be combated especially effectively by adjusting the tensile stress by switching the speed to the respective next or last supporting pinch roll with progressive passage of the metal strip or sheet.
In one embodiment, the pinch rolls are set with a spacing such that a cooling unit is formed between two rolls, depending on the spacing.
In a refinement of the invention, this spacing can be adjusted to a half-length of the resulting characteristic form for a strip or sheet with the least thickness, at maximum width and high cooling intensity.
The device for the controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet, running out of a hot-rolled strip mill is equipped with vertical pairs of double rolls and pairs of pinch rolls which follow them (in the direction of strip flow), between each of which a cooling unit is installed.
In accordance with some embodiments of the invention, the stated objective may be achieved with a device of this type by installing a pre-straightening machine before the pairs of pinch rolls with the cooling units, between which a controlled tensile stress can be produced. This makes it possible to transmit a tensile force even before the cooling, so that the magnitude of the deformations that are present is already reduced here. An even more exact determination of the tensile stresses inside the cooling units then occurs.
In accordance with other features, the cooling units are each designed for a high and an intermediate cooling intensity.
The effect of the cooling can be increased still further by providing the cooling unit with finely adjustable cooling elements at the outlet of the metal strip.
The cooling can be further developed in such a way that the cooling unit is designed for a high and/or an intermediate cooling intensity in accordance with a predetermined product spectrum.
Some embodiments of the invention can be further improved by also making it possible to produce tensile stresses between the last, supporting pinch rolls or the straightening rolls at the trailing end of the metal strip or sheet and the pinch rolls or the straightening rolls at the leading end of the metal strip or sheet.
According to one aspect of the present invention, there is provided a method for controlled straightening and cooling of a wide metal strip running out of a hot strip rolling mill, the method comprising: guiding the metal strip through a splash cooling installation comprising a first cooling unit between a double roller, which comprises two individual rollers arranged vertically one above the other;
and at least one pinching roller pair arranged subsequent to the double roller in strip running direction; wherein a tensile stress is produced in a longitudinal direction in the metal strip between the double roller and the at least one pinching roller pair; wherein prior to entry into the double roller without use of a cooling unit, running the metal strip through a pre-straightening machine with straightening rollers and associated rotary drive motors, which places the metal strip under defined tensile stresses by regulation of the rotary drive motors for the straightening rollers of the pre-straightening machine.
According to another aspect of the present invention, there is provided an apparatus for controlled straightening and cooling of a wide metal strip, running out of a hot-strip rolling mill, comprising: a splash cooling installation with a double roller having two individual rollers arranged vertically one above the other, at least one pinching roller pair arranged subsequent to the double rollers in strip running direction and a first cooling unit arranged between the double roller and the at least one pinching roller pair; wherein a tensile stress is provided in a longitudinal direction in the metal strip when it is guided through the splash cooling installation between the double roller and the at least one pinching roller pair, a pre-straightening machine, which is upstream of the splash cooling installation with straightening rollers and associated rotary drive motors adapted to, under defined tensile stresses by regulation of the rotary drive motors of the straightening rollers of the pre-straightening machine, move the metal strip, between the pre-straightening machine and the double roller without cooling.
The embodiments of the invention illustrated in the drawings are explained in greater detail below.
-- Figure 1 shows a system diagram of the cooling with pinch rolls and of the drive control with the tensile stresses produced.
-- Figure 2A shows a perspective view of the steel strip or sheet with distortions in the form of center waviness.
-- Figure 2B shows a side view of two pairs of pinch rolls arranged with a certain spacing distance.
-- Figure 3 shows the arrangement of the cooling devices for the given cooling intensity.
-- Figure 4 shows a view of a total installation for straightening and cooling.
6a The metal strip, especially the steel strip 1 or sheet, is conveyed by a tensile stress 6 acting in the longitudinal direction (strip flow direction 2) for controlled cooling and straightening with the use of pinch rolls 5 arranged after (in the direction of strip flow 2) vertical double rolls 3 and 4.
In the process, the metal strip 1 is moved between a pre-straightening machine 7 and a splash cooling installation 8 under defined conditions of tensile stress 6 by adjustment of the tensile stress (by the straightening roll rotational drive motors). The metal strip 1 is then cooled inside the splash cooling installation between successive pairs of pinch rolls 5a, and the tensile stress is additionally controlled. The splash cooling installation 8 comprises cooling units 9 installed between each two pairs of pinch rolls 5a (Figure 1). While the metal strip 1 is entering at roller table speed 10, the tensile stress 6 is controlled via a suitable torque 11 by a feedback control system 12, which is designated (A) action of the pinch rolls 5 (i) to (i + nc). As soon as the trailing end la of the strip passes through, which is designated (B) action of the pinch rolls 5 (i) to (i + nc), suitable tensile stress is transmitted to the trailing end la of the strip, and only the comparison speed is still measured beyond the end la of the strip without using the feedback control system 12. Both for the trailing end la of the strip and the leading end lb of the strip, the tensile stress 6 is adjusted by switching the speed to the respective next or last supporting pinch roll 5 with progressive passage of the metal strip (see Figure 1).
The pinch rolls 5 are installed with a certain spacing 13, such that the cooling unit 9 is formed between two pinch rolls 5, depending on the spacing 13. For example, the spacing 13 can be based on a half-length 14 of the resulting wavelength 15 for a metal strip with the least thickness, at maximum width and high cooling intensity. The typical wavelength 15 develops in the steel strip 11 (Figure 2A).
The cooling units are each designed for a high or an intermediate cooling intensity (Figure 2B), such that the spacing 13 corresponds to the half wavelength 15 (cf. Figure 2B). The behavior of the wave 16 is clearly shown by the dotted lines 17 in Figures 2A and 2B.
Figure 3 shows the cooling effect of the different individual types of cooling devices 9. In the graph of temperature as a function of time, the solid curve represents the behavior of the temperature 20 in the center of the strip or sheet, and the broken curve represents the surface temperature 21. Splash cooling units 8a are used in the sections (1).
Cooling units 9, which consist of U-tube units 22, are provided at the outlet 18 of the steel strip 1.
On the basis of the temperature AT-center (1), the temperature in the center of the steel strip 1 or the temperature AT-center (2) is reached.
The temperature AT-surface is reached while still in the zone of the splash cooling units 8a. When the U-tube units 22 are used, the necessary cooling stop temperature is attained in small increments by the U-tube units 22. Martensite formation by surface subcooling is prevented above the temperature T-martensite.
Tensile stresses 6 can be produced in the same procedure between the last supporting pinch rolls 5 or straightening rolls 23 at the trailing end la of the metal strip 1 or sheet and the pinch rolls 5 or the straightening rolls 24 at the leading end lb of the metal strip 1.
Figure 4 shows a complete installation, in which, in the direction of strip flow 2, the pre-straightening machine 7 is followed by the splash cooling installation 8 with the pairs of pinch rolls 5a and the cooling units 9 and then by a laminar cooling installation 25.
List of Reference Numbers 1 metal strip, steel strip or sheet la trailing end of the strip lb leading end of the strip 2 direction of strip flow 3 double roll 4 double roll pinch roll 5a pair of pinch rolls 6 tensile stress 7 pre-straightening machine 8 splash cooling 8a splash cooling units 9 cooling unit roller table speed 11 torque 12 feedback control system 13 spacing 14 half-length resulting wavelength 16 wave behavior 17 dotted line 18 outlet 19 cooling element 20 strip or sheet center 21 surface temperature 22 U-tube units 23 straightening roll 24 straightening roll 25 laminar cooling installation Figure 1.
KEY:
Quetsch-Rolle = pinch roll K{hleinheit = cooling unit Eingriff der Quetsch-Rollen (i) bis (i + nc) = action of the pinch rolls (i) to (i + nc) Zugspannung = tensile stress Rollgangsgeschwindigkeit = roller table speed Drehmoment = torque Ruckmeldungs-Regelung = feedback control system Nur Vergleichs-Geschwindigkeit, Keine Ruckmeldungssteuerung =
only comparison speed, no feedback control Figure 3.
KEY:
Temperatur = temperature Mitte = center Oberflache = surface T-Martensit = T-martensite Zeit = time.
Claims (12)
1. A method for controlled straightening and cooling of a wide metal strip running out of a hot strip rolling mill, the method comprising:
guiding the metal strip through a splash cooling installation comprising a first cooling unit between a double roller, which comprises two individual rollers arranged vertically one above the other; and at least one pinching roller pair arranged subsequent to the double roller in strip running direction;
wherein a tensile stress is produced in a longitudinal direction in the metal strip between the double roller and the at least one pinching roller pair;
wherein prior to entry into the double roller without use of a cooling unit, running the metal strip through a pre-straightening machine with straightening rollers and associated rotary drive motors, which places the metal strip under defined tensile stresses by regulation of the rotary drive motors for the straightening rollers of the pre-straightening machine.
guiding the metal strip through a splash cooling installation comprising a first cooling unit between a double roller, which comprises two individual rollers arranged vertically one above the other; and at least one pinching roller pair arranged subsequent to the double roller in strip running direction;
wherein a tensile stress is produced in a longitudinal direction in the metal strip between the double roller and the at least one pinching roller pair;
wherein prior to entry into the double roller without use of a cooling unit, running the metal strip through a pre-straightening machine with straightening rollers and associated rotary drive motors, which places the metal strip under defined tensile stresses by regulation of the rotary drive motors for the straightening rollers of the pre-straightening machine.
2. The method according to claim 1, further comprising regulating the tensile stress in the metal strip or plate within the splash cooling installation between two respective pinching roller pairs following one another in the strip running direction.
3. The method according to claim 2, further comprising cooling the metal strip between the successive pinching roller pairs.
4. The method according to any one of claims 1 to 3, further comprising adjusting the tensile stresses by switching a speed to a respective next or last supporting pinching roller pair with progressive passage of the metal strip.
5. The method according to any one of claims 1 to 4, wherein the at least one pinching roller pair comprises at least two pinching roller pairs and the at least two pinching roller pairs are fixed at a pitch, wherein a cooling unit is formed between the at least two pinching rollers.
6. The method according to claim 5, wherein the pitch is adjusted to a half length of a resulting intrinsic shape for a metal strip with a smallest thickness at a maximum width and high cooling intensity.
7. An apparatus for controlled straightening and cooling of a wide metal strip, running out of a hot-strip rolling mill, comprising:
a splash cooling installation with a double roller having two individual rollers arranged vertically one above the other, at least one pinching roller pair arranged subsequent to the double rollers in strip running direction and a first cooling unit arranged between the double roller and the at least one pinching roller pair; wherein a tensile stress is provided in a longitudinal direction in the metal strip when it is guided through the splash cooling installation between the double roller and the at least one pinching roller pair, a pre-straightening machine, which is upstream of the splash cooling installation with straightening rollers and associated rotary drive motors adapted to, under defined tensile stresses by regulation of the rotary drive motors of the straightening rollers of the pre-straightening machine, move the metal strip, between the pre-straightening machine and the double roller without cooling.
a splash cooling installation with a double roller having two individual rollers arranged vertically one above the other, at least one pinching roller pair arranged subsequent to the double rollers in strip running direction and a first cooling unit arranged between the double roller and the at least one pinching roller pair; wherein a tensile stress is provided in a longitudinal direction in the metal strip when it is guided through the splash cooling installation between the double roller and the at least one pinching roller pair, a pre-straightening machine, which is upstream of the splash cooling installation with straightening rollers and associated rotary drive motors adapted to, under defined tensile stresses by regulation of the rotary drive motors of the straightening rollers of the pre-straightening machine, move the metal strip, between the pre-straightening machine and the double roller without cooling.
8. The apparatus according to claim 7, further comprising a feedback control for controlling the tensile stress between two pinching roller pairs by control of torques.
9. The apparatus according to claim 8, further comprising a respective cooling unit between the two pinching roller pairs.
10. The apparatus according to any one of claims 7 to 9, wherein a cooling unit with finely adjustable cooling elements is provided at an outlet of the splash cooling installation.
11. The apparatus according to any one of claims 7 to 10, wherein the first cooling unit is designed for at least one of a high and a medium cooling output in the sense of a predetermined product spectrum.
12. The apparatus according to any one of claims 7 to 11, wherein tensile stresses can be produced between one or more of:
a last, supporting pinching roller pair;
the straightening rollers at an end of the metal strip and the at least one pinching roller pair; or the straightening rollers at a start of the metal strip.
a last, supporting pinching roller pair;
the straightening rollers at an end of the metal strip and the at least one pinching roller pair; or the straightening rollers at a start of the metal strip.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10163070A DE10163070A1 (en) | 2001-12-20 | 2001-12-20 | Method and device for the controlled straightening and cooling of wide metal strip, in particular steel strip or sheet metal, emerging from a hot strip rolling mill |
| DE10163070.0 | 2001-12-20 | ||
| PCT/EP2002/013035 WO2003054236A1 (en) | 2001-12-20 | 2002-11-21 | Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2469073A1 CA2469073A1 (en) | 2003-07-03 |
| CA2469073C true CA2469073C (en) | 2011-10-11 |
Family
ID=7710240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2469073A Expired - Fee Related CA2469073C (en) | 2001-12-20 | 2002-11-21 | Method and device for controlled straightening and cooling of wide metal strip, especially steel strip or sheet, running out of a hot-rolled strip mill |
Country Status (13)
| Country | Link |
|---|---|
| US (2) | US20050016643A1 (en) |
| EP (1) | EP1456421B1 (en) |
| JP (1) | JP4440643B2 (en) |
| CN (1) | CN100402672C (en) |
| AT (1) | ATE328123T1 (en) |
| AU (1) | AU2002350708A1 (en) |
| BR (1) | BR0214598A (en) |
| CA (1) | CA2469073C (en) |
| DE (2) | DE10163070A1 (en) |
| ES (1) | ES2261757T3 (en) |
| RU (1) | RU2307718C2 (en) |
| UA (1) | UA77241C2 (en) |
| WO (1) | WO2003054236A1 (en) |
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| JP4315951B2 (en) * | 2005-12-26 | 2009-08-19 | 株式会社神戸製鋼所 | Steel plate for welding |
| JP2011042814A (en) * | 2009-08-19 | 2011-03-03 | Chugai Ro Co Ltd | Apparatus and method for cooling metallic strip |
| US9822422B2 (en) * | 2009-09-24 | 2017-11-21 | Ati Properties Llc | Processes for reducing flatness deviations in alloy articles |
| IN2012DN02260A (en) | 2009-10-07 | 2015-08-21 | Nippon Steel & Sumitomo Metal Corp | |
| EP2353742A1 (en) * | 2010-02-05 | 2011-08-10 | Siemens Aktiengesellschaft | Heat rolling train for rolling hot rolled strips, method for operating same to roll hot rolled strips, control and/or regulating device |
| EP2361699A1 (en) * | 2010-02-26 | 2011-08-31 | Siemens Aktiengesellschaft | Method for cooling sheet metal with a cooling section, cooling section and control and/or regulating device for a cooling section |
| CN101993995B (en) * | 2010-11-26 | 2012-05-30 | 首钢总公司 | Water quenching and cooling method and device for ultrahigh-strength strip steel |
| RU2463122C2 (en) * | 2010-12-16 | 2012-10-10 | Валерий Никитич Гринавцев | Method of strip straightening |
| RU2456109C1 (en) * | 2010-12-16 | 2012-07-20 | Валерий Никитич Гринавцев | Strip straightening machine |
| RU2474623C1 (en) * | 2011-10-31 | 2013-02-10 | Валентин Николаевич Никитин | Method of producing high-strength martensitic sheet steel and thermal strain complex to this end |
| KR101376565B1 (en) * | 2011-12-15 | 2014-04-02 | (주)포스코 | Method and apparatus for controlling the temperature of strip in the rapid cooling section of continuous annealing line |
| DE102012110010B4 (en) * | 2012-10-19 | 2016-09-01 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Apparatus and method for the continuous treatment of a metal strip |
| CN105483343B (en) * | 2014-09-17 | 2017-06-23 | 宝山钢铁股份有限公司 | Medium and Heavy Plate Rolling Production linear velocity control method for improving steel plate flatness |
| CN104451117A (en) * | 2014-09-23 | 2015-03-25 | 中冶赛迪工程技术股份有限公司 | Quenching plate shape control method and device |
| DE102017118244A1 (en) * | 2017-08-10 | 2019-02-14 | Thyssenkrupp Ag | Apparatus and method for producing a hot strip |
| DE102017127470A1 (en) * | 2017-11-21 | 2019-05-23 | Sms Group Gmbh | Chilled beams and cooling process with variable cooling rate for steel sheets |
| US12091239B2 (en) | 2021-11-11 | 2024-09-17 | Advanced Composite Structures, Llc | Formed structural panel with open core |
| CN114959201B (en) * | 2022-06-27 | 2023-10-27 | 江西省科学院应用物理研究所 | A graded annealing and cooling device for metal materials |
| CN116765134A (en) * | 2023-04-18 | 2023-09-19 | 山西太钢不锈钢股份有限公司 | Sectional steel throwing operation method for preventing roll surfaces of hot rolling leveling unit from being bonded |
| CN117621423B (en) * | 2023-11-07 | 2024-05-14 | 东莞市首誉电子材料有限公司 | Preparation control method, device, equipment and medium of screen optical film |
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| FR2217425A1 (en) * | 1972-11-15 | 1974-09-06 | Creusot Loire | Quenching metal sheet under tension - average or thick sheet is rapidly cooled without warping |
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| US4813652A (en) * | 1981-11-26 | 1989-03-21 | Union Siderurgique Du Nord Et De L'est De La France (Usinor) | Plant for effecting the controlled cooling of metal sheets |
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| DE4437872C1 (en) * | 1994-10-22 | 1996-03-14 | Bwg Bergwerk Walzwerk | Method for producing metal sheets, in particular large-sized metal sheets, and device |
| EP1210993B2 (en) * | 2000-03-01 | 2016-07-06 | JFE Steel Corporation | Device and method for cooling hot rolled steel band and method of manufacturing the hot rolled steel band |
-
2001
- 2001-12-20 DE DE10163070A patent/DE10163070A1/en not_active Withdrawn
-
2002
- 2002-11-21 EP EP02785402A patent/EP1456421B1/en not_active Expired - Lifetime
- 2002-11-21 UA UA20040705923A patent/UA77241C2/en unknown
- 2002-11-21 CN CNB028257057A patent/CN100402672C/en not_active Expired - Lifetime
- 2002-11-21 ES ES02785402T patent/ES2261757T3/en not_active Expired - Lifetime
- 2002-11-21 US US10/498,652 patent/US20050016643A1/en not_active Abandoned
- 2002-11-21 AU AU2002350708A patent/AU2002350708A1/en not_active Abandoned
- 2002-11-21 WO PCT/EP2002/013035 patent/WO2003054236A1/en not_active Ceased
- 2002-11-21 DE DE50207037T patent/DE50207037D1/en not_active Expired - Lifetime
- 2002-11-21 AT AT02785402T patent/ATE328123T1/en active
- 2002-11-21 JP JP2003554935A patent/JP4440643B2/en not_active Expired - Lifetime
- 2002-11-21 RU RU2004122098/02A patent/RU2307718C2/en active
- 2002-11-21 BR BR0214598-7A patent/BR0214598A/en not_active IP Right Cessation
- 2002-11-21 CA CA2469073A patent/CA2469073C/en not_active Expired - Fee Related
-
2011
- 2011-10-11 US US13/270,842 patent/US20120024435A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20120024435A1 (en) | 2012-02-02 |
| EP1456421A1 (en) | 2004-09-15 |
| CA2469073A1 (en) | 2003-07-03 |
| JP4440643B2 (en) | 2010-03-24 |
| RU2307718C2 (en) | 2007-10-10 |
| DE50207037D1 (en) | 2006-07-06 |
| UA77241C2 (en) | 2006-11-15 |
| EP1456421B1 (en) | 2006-05-31 |
| US20050016643A1 (en) | 2005-01-27 |
| JP2005512816A (en) | 2005-05-12 |
| BR0214598A (en) | 2004-11-03 |
| ATE328123T1 (en) | 2006-06-15 |
| ES2261757T3 (en) | 2006-11-16 |
| CN1606630A (en) | 2005-04-13 |
| DE10163070A1 (en) | 2003-07-03 |
| AU2002350708A1 (en) | 2003-07-09 |
| RU2004122098A (en) | 2005-03-27 |
| WO2003054236A1 (en) | 2003-07-03 |
| CN100402672C (en) | 2008-07-16 |
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| EEER | Examination request | ||
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Effective date: 20181121 |