GB2163985A - Temperature control of hot strip mill - Google Patents

Temperature control of hot strip mill Download PDF

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Publication number
GB2163985A
GB2163985A GB08521284A GB8521284A GB2163985A GB 2163985 A GB2163985 A GB 2163985A GB 08521284 A GB08521284 A GB 08521284A GB 8521284 A GB8521284 A GB 8521284A GB 2163985 A GB2163985 A GB 2163985A
Authority
GB
United Kingdom
Prior art keywords
strip
stand
rolling
rolling mill
mill
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.)
Granted
Application number
GB08521284A
Other versions
GB8521284D0 (en
GB2163985B (en
Inventor
Harry Laurence Fred Bond
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Davy McKee AG
Original Assignee
Davy McKee AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GB848422216A external-priority patent/GB8422216D0/en
Application filed by Davy McKee AG filed Critical Davy McKee AG
Priority to GB08521284A priority Critical patent/GB2163985B/en
Publication of GB8521284D0 publication Critical patent/GB8521284D0/en
Publication of GB2163985A publication Critical patent/GB2163985A/en
Application granted granted Critical
Publication of GB2163985B publication Critical patent/GB2163985B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • B21B45/008—Heat shields
    • 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
    • B21B1/24—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
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0085—Joining ends of material to continuous strip, bar or sheet
    • 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
    • B21B37/005—Control of time interval or spacing between workpieces
    • 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
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

In a method of hot rolling metal strip, work pieces 7 are joined end-to-end and enter continuously into a multi-stand rolling mill. The temperature of the strip at the last stand 6 is compared with a desired value and the difference, if any, is used either to apply cooling liquid from headers 9 to the strip between stands or heat retaining panels 13 are positioned over the strip to reduce heat loss from the strip. <IMAGE>

Description

SPECIFICATION Temperature control of hot strip mill This invention relates to a method of rolling hot metal strip, particularly steel strip, in a continuous manner and to a multi-stand hot rolling mill which permits the strip to be hot rolled in a continuous manner.
In the rolling of hot metal strip where a single work piece is taken and rolled down to strip of the required gauge, it is usual to roll the work piece at a slow speed until sufficient of it has been rolled to enable the strip to be threaded through the mill train and on to the coiler. Subsequently the rolling speed is increased rapidly to its normal rolling valve. A tone or more locations between pairs of adjacent mill-stands it is usual to supply liquid coolant to the strip to ensure that the temperature of the strip at the last stand of the rolling mill is at a desired level.
In contrast to this, when hot metal work pieces are joined end-to-end and are rolled in a multistand rolling mill to produce continuous length of strip, once the strip has been threaded through the mill stand, the speed is raised to its maximum value and rolling continues at this constant rolling speed.
It has been found that with continuous rolling, particularly when the strip is rolled to thin gauge, the temperature of the strip at the last stand of the mill may be below the desired temperature. This means that the metallurgical properties of the strip may be unsatisfactory.
It is an object of the present invention to pnDvide a method of, and apparatus for, enabling hot metal workpieces to be rolled continuously into metal strip and at the same time to ensure that the strip is rolled at the last stand at the correct rolling temperature.
According to a first aspect of the present invention in a method of rolling metal strip, hot metal workpieces are joined end-to-end and enter at substantially constant speed into a multi-stand rolling mill to be rolled into a continuous length of strip; the rolling temperature of the strip at the last stand of the rolling mill is determined and compared with a desired temperature value; and, depending on the result of said comparison at one or more locations between pairs of adjacent stands, either liquid coolant is supplied to the strip or liquid coolant is not supplied and action is taken to reduce heat loss from the strip so as to keep the rolling temperature of the strip at said last stand of the rolling mill substantially equal to said desired temperature value.
If the comparison between the temperature of the strip at the last stand and the desired temperature value indicates that the desired temperature at the last stand is being exceeded, liquid coolant is supplied to the strip at said one or more locations so that the rolling temperature of the strip at the last stand is reduced so as to be substantially equal to the desired temperature value. On the other hand, if the temperature at the last stand is below the desired temperature value then liquid coolant is not supplied and action is taken to reduce the heat loss from the strip. This action may be in the form of positioning heat insulating panels around the strip, the panels serving to reduce the heat loss from the strip.
According to the second aspect to the present invention, a multi-stand hot rolling mill has at one or more.locations between pairs of adjacent mill stands, both apparatus for supplying liquid coolant to strip being rolled and apparatus for reducing heat loss from the strip being rolled; means are provided at the last stand of the mill for determining the temperature of the strip being rolled and means are provided for comparing said temperature with a desired temperature value and, in consequence of said comparision, selecting at said one or more locations which of the liquid cooling apparatus or the heat retaining apparatus is brought into operation.
The heat retaining apparatus conveniently takes the form of panels known under the trade name Enco panels and these panels when positioned above the strip reduce the heat loss from the strip other than by conduction between the strip and the roller table supporting it.
The panels are conveniently mounted on guides and actuator means serve to displace the panels along the guides between positions in which they are overlying the path taken by the strip and positions in which they are to one side of the path taken by the strip.
In order that the invention may be more readily understood, it will now be described, by way of example only, with reference to accompanying drawing in which: Figure 1 is a diagrammatic side elevation of a rolling mill in accordance with the present invention; and Figure 2 is a plan.
Reference numeral 1 indicates generally the first mill stand in a multi-stand rolling mill and reference 6 indicates the last stand of the rolling mill.
The stands 2, 3, 4 and 5 are indicated generally by the reference numbers 2 to 5 respectively. A metal work piece 7 entering the first stand consists of a number of workpieces arranged end-to-end so that the mill operates continuously to hot roll the work pieces into metal strip 8.
Apparatus for directing liquid coolant on to at least the upper surface of the strip is located between stands 2 and 3, 3 and 4, and 4 and 5 and is indicated by reference numeral 9. This apparatus is conveniently in the form of a header which extends for the full width of the strip and to which water under pressure is supplied and from which a continuous water curtain is applied across the width of the strip. Between each of the pair of stands 2 and 3 and 4 and 5, an Enco panel 10 is positioned above the path taken by the strip and it is mounted on guides 11. These Enco panels are of heat insulating material with a reflecting surface and when positioned above the strip serve to reduce the natural heat loss from the strip as it passes beneath the panel.
When hot rolling metal strip it is essential that the temperature of the strip at the last stand 6 is kept close to a desired value to ensure that the metallurgical properties of the strip are satisfactory At the last stand a temperature measuring device 12 serves to continuously determine the temperature of the strip. A control circuit compares the temperature of the strip at the last stand as indicated by the measuring device 12 with a desired value of strip temperature and the difference, if any, is employed in such a manner as to bring the rolling temperature at the last stand closer to the desired value. To this end, if this comparison indicates that the temperature at the last stand is too high, more liquid coolant is applied to the strip at the locations between stands 2 and 3 and 4 and 5.
On the other hand, if the temperature at the last stand is below the desired value, then the liquid coolant is shut off and actuators 13 are energised to cause the Enco panels 10 to be moved along the guides 11 to positions in which they overlie the strip being rolled. When the Enco panels are in position they reduce the natural heat loss from the strip, particularly by radiation, and, in this way, the temperature of the strip when it is rolled at the last stand is brought closer to the desired value.
Enco panels may be positioned both above and below the path taken by the strip.
Provision may also be made for reducing the heat loss from the strip by introducing heat into it if the comparison shows that the temperature of the strip is excessively below the desired value at the last stand. Transverse flux induction heaters may be employed to introduce heat into the strip at one or more locations between pairs of roll stands.

Claims (7)

1. A method of rolling metal strip in which hot metal workpieces are joined end-to-end and enter at substantially constant speed into a multi-stand rolling mill to be rolled to a continuous length of strip; the rolling temperature of the strip at the last stand of the rolling mill is determined and compared with a desired temperature value; and, depending upon the result of said comparison at one or more locations between pairs of adjacent stands, either liquid coolant is supplied to the strip or liquid coolant is not applied and action is taken to reduce heat loss from the strip so as to keep the rolling temperature of the strip at said last stand of the rolling mill substantially equal to said desired temperature value.
2. A method of rolling metal strip as claimed in claim 1, in which heat retaining panels are positioned above the strip when it is necessary to reduce the heat loss from the strip.
3. A multi-stand hot rolling mill having at one or more locations between pairs of adjacent mill stands both apparatus for supplying liquid coolant to strip being rolled and heat retaining apparatus for reducing heat loss from the strip being rolled; means at the last stand of the mill for determining the temperature of the strip being rolled and means for comparing said temperature with a desired temperature value and, in consequence of said comparison, selecting at said one or more locations which of the liquid coolant apparatus or the heat retaining apparatus is brought into opera t!on.
4. A multi-stand hot rolling mill as claimed in claim 3, in which the apparatus for reducing heat loss comprises a heat insulating panel which is positionable above the path taken by the strip.
5. A multi-stand hot rolling mill as claimed in claim 4, in which the panel is displaceable along guides between positions in which it overlies the strip and in which it does not overlie the strip, respectively.
6. A multi-stand hot rolling mill substantially as hereinbefore described with reference to the accompanying drawing.
7. A method of rolling hot metal strip substantially as hereinbefore described with reference to the accompanying drawing.
GB08521284A 1984-09-03 1985-08-27 Temperature control of hot strip mill Expired GB2163985B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08521284A GB2163985B (en) 1984-09-03 1985-08-27 Temperature control of hot strip mill

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848422216A GB8422216D0 (en) 1984-09-03 1984-09-03 Temperature control of hot strip mill
GB08521284A GB2163985B (en) 1984-09-03 1985-08-27 Temperature control of hot strip mill

Publications (3)

Publication Number Publication Date
GB8521284D0 GB8521284D0 (en) 1985-10-02
GB2163985A true GB2163985A (en) 1986-03-12
GB2163985B GB2163985B (en) 1987-09-03

Family

ID=26288175

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08521284A Expired GB2163985B (en) 1984-09-03 1985-08-27 Temperature control of hot strip mill

Country Status (1)

Country Link
GB (1) GB2163985B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9694405B2 (en) 2013-05-03 2017-07-04 Sms Group Gmbh Hot-rolling mill
EP3284546A1 (en) * 2016-08-19 2018-02-21 SMS Group GmbH Method for rolling a rolling product in a rolling line and rolling line
WO2018138038A1 (en) * 2017-01-24 2018-08-02 Primetals Technologies Austria GmbH Casting-rolling installation and method for treating a workpiece by means of such an installation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1040420A (en) * 1963-11-19 1966-08-24 United Eng Foundry Co Method and apparatus for controlling the temperature of hot strip
GB1258421A (en) * 1968-01-16 1971-12-30
GB1421997A (en) * 1972-03-02 1976-01-21 Wean United Inc Temperature control in rolling mills
GB2059316A (en) * 1979-10-03 1981-04-23 Gen Electric Temperature control in hot strip mill
GB1603427A (en) * 1977-05-04 1981-11-25 Encomech Eng Services Ltd Heat shield arrangements

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1040420A (en) * 1963-11-19 1966-08-24 United Eng Foundry Co Method and apparatus for controlling the temperature of hot strip
GB1258421A (en) * 1968-01-16 1971-12-30
GB1421997A (en) * 1972-03-02 1976-01-21 Wean United Inc Temperature control in rolling mills
GB1603427A (en) * 1977-05-04 1981-11-25 Encomech Eng Services Ltd Heat shield arrangements
GB2059316A (en) * 1979-10-03 1981-04-23 Gen Electric Temperature control in hot strip mill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9694405B2 (en) 2013-05-03 2017-07-04 Sms Group Gmbh Hot-rolling mill
EP3284546A1 (en) * 2016-08-19 2018-02-21 SMS Group GmbH Method for rolling a rolling product in a rolling line and rolling line
WO2018138038A1 (en) * 2017-01-24 2018-08-02 Primetals Technologies Austria GmbH Casting-rolling installation and method for treating a workpiece by means of such an installation

Also Published As

Publication number Publication date
GB8521284D0 (en) 1985-10-02
GB2163985B (en) 1987-09-03

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940827