GB2163689A - Hot rolling metal strip - Google Patents
Hot rolling metal strip Download PDFInfo
- Publication number
- GB2163689A GB2163689A GB08521203A GB8521203A GB2163689A GB 2163689 A GB2163689 A GB 2163689A GB 08521203 A GB08521203 A GB 08521203A GB 8521203 A GB8521203 A GB 8521203A GB 2163689 A GB2163689 A GB 2163689A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strip
- tension
- cooling zone
- coiler
- shear
- 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- Withdrawn
Links
Classifications
-
- 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
- B21B2015/0057—Coiling the rolled product
-
- 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
- B21B2015/0071—Levelling the rolled product
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/006—Pinch roll sets
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Strip 12 from a continuous rolling mill train 11 is passed under tension through a cooling zone 21 to a multi-coiler station 16, 18; when a predetermined length of strip has been coiled on a coiler 16 at the station, the strip is sheared upstream of the coiler station and, keeping the strip under tension, the newly sheared leading edge of the strip is directed to another coiler 18 and, prior to reaching the shear 14, the strip is flexed by a stretch leveller 22 to cause it to stretch alternately in opposite directions and thereby improve the shape of the strip. <IMAGE>
Description
SPECIFICATION
Method of and apparatus for continuously hot rolling metal strip
This invention relates to a method of continuously hot rolling metal strip and particularly, but not exclusively, to the hot rolling of steel strip. The invention is also concerned with apparatus for the continuous hot rolling of metal strip.
In the specification of British Patent No.
2073080 there is described a method of continuous hot rolling of metal strip in which a hot rolling mill train delivers a rolled strip in continuous form and in which the strip is maintained under tension through a strip cooling zone to a shear, which is located downstream of the cooling zone, and which cuts the strip into coil lengths, and thence to a multicoiler coiling installation. Tension is applied to the strip by the coiler by pinch rolls adjacent to and upstream of the shear during each interval between shearing of the strip and the subsequent gripping of the newly sheared leading end of the strip downstream of the shear by another coiler.
The invention described in the specification of the above-mentioned British patent enables the continuous hot rolling of metal strip to be operated at a high finishing speed, since the strip leaving the hot mill is continuous and under tension at all times, and this reduces the possiblity of the strip forming a cobble.
The invention also allows various forms of cooling zone to be employed.
It has been found that in the continuous hot rolling of metal strip there may be variations in tension across the width of the strip and this causes the strip to have poor shape, that is, there are undulations across the width of the strip and the strip is not flat.
It is well known to employ a stretch leveller to reduce tension variations and, hence, undulations, across the width of metal strip. Usually, after the strip has been rolled and coiled, it is then uncoiled and passed through a stretch leveller in order to improve the shape of the strip. A stretch leveller usually incorporates upper and lower trains of rolls which are staggered and meshed so that the strip cannot proceed without flexing first one way and then the other as it passes through the leveller. Tension is applied to the strip as it is passed through the leveller by means of bridles at the entry to and exit from the stretch leveller. It will be appreciated that such a leveller is not self-threading and heretofore the stretch leveller has been operated separately from the rolling of the strip.
According to the present invention, in the method of continuously rolling hot metal strip, the strip is delivered in continuous form from a hot rolling mill train; the strip is passed under tension through a strip cooling zone to a multi-coiler station; when a predetermined length of strip has been coiled on a coiler at the station, the strip is sheared upstream of the coiler station and, keeping the strip under tension, the newly sheared leading edge of the strip is directed to another coiler at the station; and wherein, prior to reaching the shear, the strip is flexed to cause stretching alternately in opposite directions.
By ensuring that the strip is kept under tension, even when the strip is sheared upstream of the coiler station, it enables a stretch leveller to be introduced into the line at a position where it operates upon the strip prior to the strip reaching the shear. The leveller causes the strip to be flexed alternately in opposite directions and, in this way, the strip is worked thereby reducing or removing tension variations across the width of the strip and, thus, strip of improved shape is produced.
After initial threading at slow speed during mill start up there are no problems with passing the strip between the rolls of the leveller, since the strip is produced continuously and, once it has been threaded through the leveller, the strip passes through the leveller continuously and does not need rethreading.
It is convenient for the strip to be flexed downstream of the cooling zone and upstream of the shear but, in a preferred arrangement, the strip may be flexed upstream of the cooling zone. At this position, the strip is at a comparatively high temperature and it is in a weak condition so, with the stretch leveller situated at this region, the strip can be stretched considerably more for a given applied tension and a significant reduction in strip thickness can also be obtained.
According to a second aspect of the invention, continuous rolling apparatus for metal strip comprises a hot rolling mill train; a strip cooling zone downstream of the mill train; a shear downstream of the strip cooling zone; a multi-coiler station downstream of the shear; pinch rolls adjacent to, and upstream of, the shear to maintain the strip in the cooling zone in tension subsequent to shearing; and a stretch leveller positioned upstream of the shear.
The magnitude of the tension in the strip can be controlled by the pinch rolls and by the coiler station and so, by varying the tension, the amount of stretch and, hence, the width of the strip can be controlled. Furthermore, measuring equipment can be employed to determine the actual width of the strip approaching the stretch leveller and it can also be used to control and modify the amount of stretch applied in order to achieve a given required width. This eliminates variations and inaccuracies in the finished width.
In order that the invention may be more readily understood, it will now be described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 shows diagrammatically the succesive stages in the hot rolling of metal strip in accordance with one embodiment of the invention; and
Figures 2 and 3 are similar to Figure 1 but showing alternative embodiments of the invention.
In the figures, the final stand of the finishing train of a hot strip mill is indicated by reference numeral 11. The metal slabs or breakdowns from the roughing train (not shown) are joined end to end and are rolled down in the finishing train in a continuous operation of the latter. The continuous strip 12 leaving the stand 11 passes over a run out table 20. The strip, is passed through a strip cooling zone and, in the arrangement shown in the figures, this is indicated, as an example, as successive groups of sprays or water curtains 21 which direct water on to the upper surface of the strip. Other forms of cooling may be employed. At the end of the run out table, the strip passes through a first pair of pinch rolls 13, located downstream of the table, and immediately downstream of the pinch rolls 13 is a flying shear 14 which is followed by a second pair of pinch rolls 15.A first coiler 16 is located below the level of the passline between the mill and the pinch rolls and a third pair of pinch rolls 17 and a second coiier 18 are located downstream. The coilers form a multi-coiler station and more than two coilers may be provided, if necessary. The pinch rolls 15 are adjustable between a first position in which they direct the strip downwardly to coiler 16 and a second position in which they direct the strip horizontally to the pinch rolls 17 which, in turn, direct the strip down to the coiler 18.
A stretch leveller, sometimes known as a tension leveller, 22 is located between the end of the run out table 20 and the pair of pinch rolls 13. The stretch leveller consists of upper and lower sets of rollers with the rollers being in interdigitated relation and with the rollers of one set overlapping to some extent the rollers of the other set. When the strip is passed between the rollers, it is first flexed and stretched in one direction as it passes around part of the periphery of one roller and then flexed and stretched in the other direction as it passes around the periphery of the next roller. This continues as it passes between the rollers, thus flexing and stretching the strip alternately in opposite directions.If the strip has undulations across its width, due to tension variations across its width, then, after it has been passed through the stretch leveller, the tension variations are reduced by the stretching and the undulations in the strip are reduced or removed.
In use, the leading end of the continuous strip at the start of the production run is led at threading speed from the stand 11 along the table 20 and is threaded between the sets of rollers which are temporarily held apart to provide space for the passage of the strip between the two sets. From the tension leveller, the strip is passed between the open pinch rolls 13 and between the shear blades 14 to the pinch rolls 15 which are arranged to direct the strip to coiler 16. Once the leading end of the strip is properly gripped by the pinch rolls 15 and tension is developed in the strip, the mill is accelerated to the required rolling speed. When the coil on coiler 16 is nearing its maximum size, pinch rolls 13 are closed and thereafter maintain tension in the strip downstream of stand 11.The pinch rolls are then moved on to the strip to control the tail end of the strip when it is severed and the shear 14 is operated to sever the strip.
The tail end of the first coil is drawn down to the coiler 16 and the leading end of the second strip is fed by the pinch rolls 15 over the coiler 16 to the pinch rolls 17 and then to the coiler 18.
The presence of the stretch leveller 22 provides strip of superior shape.
It is not essential for the leveller 22 to be positioned between the end of the run out table and the pinch rolls 13. The leveller 22A can be positioned between the stand 11 and the beginning of the run out table 20, as shown in Figure 2. In this position, the temperature of the strip is much higher when it passes through the leveller and the strip is weaker and can be stretched to a greater extent, thus increasing the ability of the tension leveller to flatten the strip.
The magnitude of the tension in the strip can be controlled by the pinch rolls and by the coiling installation and so, by varying the tension, the amount of stretch and, hence, the width of the strip, can be controlled. Measuring equipment (not shown) can be introduced to determine the actual width of the strip approaching the tension leveller and it can be used to control and modify the amount of stretch applied in order to achieve a given required width.
In the arrangement shown in Figure 3, a shape-meter roll 24 is positioned between the last stand 11 and the leveller 22A. The shape-meter roll may be of the type sold under the trade mark VIDIMON by Davy McKee (Poole) Limited of Poole, England. The shapemeter roll produces signals representative of the tension at zones across the width of the strip and these signals may be used to provide a visual display of the tension variations.
More importantly, however, the signals from the shape-meter roll may be passed to circuitry 26 which analyses the shape variations of the strip and controls the operation of at least the last stand 11 of the rolling mill in order to reduce the tension variations in the strip to a minimum. The control of the mill 11 may take the form of roll bending, differential rolling pressure across the width of the rolls, and/or variations in temperature across the width of the rolls.
Claims (12)
1. A method of continuously rolling hot metal strip in which the strip is delivered in continuous form from a hot rolling mill train; the strip is passed under tension through a strip cooling zone to a multi-coiler station; when a predetermined length of strip has been coiled on a coiler at the station, the strip is sheared upstream of the coiler station and, keeping the strip under tension, the newly sheared leading edge of the strip is directed to another coiler at the station; and wherein, prior to reaching the shear, the strip is flexed to cause stretching alternately in opposite directions.
2. A method as claimed in claim 1, wherein the strip is flexed upstream of the cooling zone.
3. A method as claimed in claim 1, wherein the strip is flexed downstream of the cooling zone.
4. A method as claimed in claim 1, 2, or 3, wherein the tension in the strip is determined and adjusted if necessary so as to vary the width of the strip.
5. A method as claimed in any preceding claim wherein, after leaving the mill, the strip is passed over a shape-meter roll which indicates the variation of tension in the strip across its width.
6. A method as claimed in claim 5, wherein the output of the shape-meter roll is employed to control the operation of the last stand of the rolling mill train in the sense to reduce the variation of tension.
7. Continuous rolling apparatus for metal strip comprising a hot rolling mill train; a strip cooling zone downstream of the mill train; a shear downstream of the strip cooling zone; a multi-coiler station downstream of the shear; pinch rolls adjacent to, and upstream of, the shear to maintain the strip in the cooling zone in tension subsequent to shearing; and a stretch leveller positioned upstream of the shear.
8. Continuous rolling apparatus as claimed in claim 7, wherein the stretch leveller is upstream of the cooling zone.
9. Continuous rolling apparatus as claimed in claim 7, wherein the stretch leveller is downstream of the cooling zone.
10. Continuous rolling apparatus as claimed in claim 7, 8 or 9, wherein a shape-meter roll is located downstream of the mill, the shapemeter roll serving to indicate variation in tension in the strip across its width.
11. A method of continuously rolling hot metal strip substantially as hereinbefore described with reference to the accompanying drawing.
12. Continuous rolling apparatus for metal strip substantially as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08521203A GB2163689A (en) | 1984-08-31 | 1985-08-23 | Hot rolling metal strip |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848422021A GB8422021D0 (en) | 1984-08-31 | 1984-08-31 | Hot rolling of metal strip |
| GB08521203A GB2163689A (en) | 1984-08-31 | 1985-08-23 | Hot rolling metal strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8521203D0 GB8521203D0 (en) | 1985-10-02 |
| GB2163689A true GB2163689A (en) | 1986-03-05 |
Family
ID=26288166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08521203A Withdrawn GB2163689A (en) | 1984-08-31 | 1985-08-23 | Hot rolling metal strip |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2163689A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0259107A2 (en) * | 1986-09-01 | 1988-03-09 | DAVY McKEE (SHEFFIELD) LIMITED | Hot strip mill |
| WO1989007992A1 (en) * | 1988-03-01 | 1989-09-08 | Davy Mckee (Sheffield) Limited | The rolling of metal strip |
| EP0367500A2 (en) * | 1988-11-03 | 1990-05-09 | DAVY McKEE (SHEFFIELD) LIMITED | The hot rolling of metal strip |
| EP0469483A2 (en) * | 1990-07-31 | 1992-02-05 | Kawasaki Steel Corporation | Process for coiler drum alternation in incessant hot rolling and apparatus therefor |
| US6128937A (en) * | 1997-09-30 | 2000-10-10 | Sms Schloemann-Siemag Aktiengesellschaft | Method and installation for shaping metal strip in a hot strip rolling mill |
| WO2002053301A1 (en) * | 2000-12-28 | 2002-07-11 | Kawasaki Steel Corporation | Hot rolling method and hot rolling line |
| DE102017202909A1 (en) | 2016-11-07 | 2018-05-09 | Sms Group Gmbh | Method and plant for producing a metallic strip |
| DE102017212529A1 (en) | 2017-07-20 | 2019-01-24 | Sms Group Gmbh | Method for producing a metallic strip |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309073A (en) * | 2021-12-14 | 2022-04-12 | 中国重型机械研究院股份公司 | Aluminum plate strip cleaning, pulling and straightening device and process thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB918005A (en) * | 1960-03-24 | 1963-02-13 | Moeller & Neumann Gmbh | Hot sheet rolling mill |
| GB2073080A (en) * | 1980-04-03 | 1981-10-14 | Davy Loewy Ltd | Hot rolling of metal strip |
-
1985
- 1985-08-23 GB GB08521203A patent/GB2163689A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB918005A (en) * | 1960-03-24 | 1963-02-13 | Moeller & Neumann Gmbh | Hot sheet rolling mill |
| GB2073080A (en) * | 1980-04-03 | 1981-10-14 | Davy Loewy Ltd | Hot rolling of metal strip |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0259107A2 (en) * | 1986-09-01 | 1988-03-09 | DAVY McKEE (SHEFFIELD) LIMITED | Hot strip mill |
| EP0259107A3 (en) * | 1986-09-01 | 1989-03-01 | Davy Mckee (Sheffield) Limited | Hot strip mill |
| WO1989007992A1 (en) * | 1988-03-01 | 1989-09-08 | Davy Mckee (Sheffield) Limited | The rolling of metal strip |
| EP0367500A2 (en) * | 1988-11-03 | 1990-05-09 | DAVY McKEE (SHEFFIELD) LIMITED | The hot rolling of metal strip |
| EP0367500A3 (en) * | 1988-11-03 | 1990-10-31 | Davy Mckee (Sheffield) Limited | The hot rolling of metal strip |
| EP0469483A2 (en) * | 1990-07-31 | 1992-02-05 | Kawasaki Steel Corporation | Process for coiler drum alternation in incessant hot rolling and apparatus therefor |
| EP0469483A3 (en) * | 1990-07-31 | 1992-04-08 | Kawasaki Steel Corporation | Process for coiler drum alternation in incessant hot rolling and apparatus therefor |
| US6128937A (en) * | 1997-09-30 | 2000-10-10 | Sms Schloemann-Siemag Aktiengesellschaft | Method and installation for shaping metal strip in a hot strip rolling mill |
| WO2002053301A1 (en) * | 2000-12-28 | 2002-07-11 | Kawasaki Steel Corporation | Hot rolling method and hot rolling line |
| DE102017202909A1 (en) | 2016-11-07 | 2018-05-09 | Sms Group Gmbh | Method and plant for producing a metallic strip |
| WO2018082943A1 (en) | 2016-11-07 | 2018-05-11 | Sms Group Gmbh | Method and system for producing a metal strip |
| DE102017212529A1 (en) | 2017-07-20 | 2019-01-24 | Sms Group Gmbh | Method for producing a metallic strip |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8521203D0 (en) | 1985-10-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |