WO1990009249A1 - The measurement of shape of metal strip - Google Patents
The measurement of shape of metal strip Download PDFInfo
- Publication number
- WO1990009249A1 WO1990009249A1 PCT/GB1990/000171 GB9000171W WO9009249A1 WO 1990009249 A1 WO1990009249 A1 WO 1990009249A1 GB 9000171 W GB9000171 W GB 9000171W WO 9009249 A1 WO9009249 A1 WO 9009249A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- strip
- roll
- detector
- roller
- determining
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/045—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands for measuring the tension across the width of a band-shaped flexible member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
- B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
-
- 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
Definitions
- the two lateral edges of the strip must engage with the detector roll, i.e. the width of the strip must not be greater than the overall length of the roll.
- the width of the strip is not exactly equal to the length of the roll, or to a multiple of the width of each roller, at least one of the outer rollers of the roll will have strip contacting it along only a portion of its periphery in the direction which is parallel to its axis of rotation.
- the detector associated with that roll will not indicate a true value of the force applied to the roll by the strip and a false impression of the shape of the edge of the strip will be given.
- this can be taken into account when determining the force indicated by the detector if the position of"the edge of the strip on the roller is known.
- edges of the strip are "tight" whereas, just inboard of each edge, there is a longitudinally extending "loose” region. If the edge and the longitudinally extending loose region engage with the same roller of the detector roll, the relatively high force applied to the roller by the tight edge offsets, to some extent, the lower force applied to the roller by the loose region and, consequently, the force indicated by the detector associated with that roller does not give an indication of the shape of either the edge or the loose region of the strip. It is an object of the present invention to provide a method of, and apparatus for, overcoming these difficulties.
- said detector roll comprises a plurality of rollers arranged side-by-side and rotatable about an axis which is normal to the direction of movement of the strip and each roller having a detector associated with it for determining the force applied to the roller by the strip, characterised in that either the path taken by the strip relative to the detector roll is adjusted or the axial position of the detector roll relative to the path taken by the strip is adjusted so that at least one of the lateral edges of the strip takes up a predetermined position with respect to the roll such that the edge region and the loose region inboard thereof engage with different rollers.
- the strip may be moved laterally with respect to the rolls of the rolling mill and to the detector roll so that the strip is offset laterally from the usual path through the mill.
- a detector roll for use in determining the shape of metal strip rolled in a rolling mill comprises a plurality of rollers arranged side-by-side and rotatable about a common axis, each roller having a detector associated with it for determining force applied to the roller by metal strip passing around part of the periphery of the roller, and means for displacing said roll in the direction of said axis.
- a hot metal strip 1 leaving a stand, usually the last stand, of a multi-stand rolling mill is moving in the direction of its length.
- the strip passes over and engages with the periphery of a detector roll 2 which consists of a plurality of rollers 3 arranged side-by-side and rotatable about an axis 4 of an arbor 4'.
- Each roller has a detector (not shown) associated with it which detects the force applied to the roller by the portion of the strip engaging it.
- a detector roll of this type is well known and is sold by Davy McKee (Poole) Limited, Wallisdown Road, Poole, Dorset BH12 5AG, England under the Trade Mark VIDIMON.
- a device 7, which may take the form of a fluid operable piston-cylinder device, is coupled to the end of the roll to axially displace the detector roll.
- the centre-line of the strip is indicated by reference 5 and, if the roller 3 at the centre of the roll is centred on the centre-line 5, as shown in the upper part of the figure, the outer edge 6 of the strip bears against the periphery of a roller 3 but, depending upon the width of the strip, a part of the periphery of the roller does not have strip bearing against it.
- the signal obtained from the detector associated with that roller will be different from the signals obtained from other rollers which have strip bearing against them over the entire length of the roller. This can be taken into account when considering the output of the detector.
- the tight edge 6 of the strip is arranged to bear against one of the rollers and the part of the strip which bears against the adjacent roller is the inboard region 8 which is subject to "loose” rolling.
- the tight edge 6 of the strip and the loose region 8 of the strip are on adjacent rollers and their effect can be determined by the appropriate rollers. This is shown in the lower part of the figure.
- the detector roll may be displaced axially by the device 7 to bring this about.
- the detector roll may be kept in a fixed position and the track taken by the strip through the stands of the rolling mill may be shifted sideways, i.e. off-centre rolling, so that the lateral edge of the strip takes up the predetermined position with respect to the roller against which it engages so that the tight edge and the loose inboard region engage different rollers.
- Spray nozzles 9 mounted on a spray bar 10 are employed to cool the work rolls of one or more stands and the sprays are controlled with reference to the strip tension at regions across its width as determined by the detector roll.
- the spray nozzles could, alternatively, be used to spray lubricant on to the strip before it enters into one of the mill stands.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Metal Rolling (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
In the rolling of metal strip, a detector roll is used to determine variations along the width of the strip and to make sure that one lateral edge of the strip takes up a predetermined position with an individual roller on the detector roll, either the strip is moved sideways with respect to the roll or the roll is moved in the direction of its axis of rotation.
Description
THE MEASUREMENT OF SHAPE OF METAL STRIP
It is well known to determine the shape of metal strip moving in the direction of its length under tension by passing the strip in contact with part of the periphery of a detector roll which is rotatable about an axis extending at right angles to the direction of movement of the strip. The detector roll determines the tension in the strip at intervals across its width and a variation in tension across the width of the strip indicates that the strip is not of uniform shape across its width.
A well known detector roll, sold under the trade name VIDIMON, comprises a number of rollers arranged side-by-side and rotatable about a common axis. Each roller has detector means associated with it for determining the force applied to the roller by the part of the strip which engages the periphery of the roller. The force is representative of the tension in that part of the strip.
To be able to determine the strip tension at its edges, the two lateral edges of the strip must engage with the detector roll, i.e. the width of the strip must not be greater than the overall length of the roll. However, if the width of the strip is not exactly equal to the length of the roll, or to a multiple of the width of each roller, at least one of
the outer rollers of the roll will have strip contacting it along only a portion of its periphery in the direction which is parallel to its axis of rotation. In this event, the detector associated with that roll will not indicate a true value of the force applied to the roll by the strip and a false impression of the shape of the edge of the strip will be given. However, this can be taken into account when determining the force indicated by the detector if the position of"the edge of the strip on the roller is known.
For strip of certain widths, the rollers at both ends of the roll may give a false impression of the shape of the edges of the strip.
Furthermore, when rolling metal strip, it is often the case that the edges of the strip are "tight" whereas, just inboard of each edge, there is a longitudinally extending "loose" region. If the edge and the longitudinally extending loose region engage with the same roller of the detector roll, the relatively high force applied to the roller by the tight edge offsets, to some extent, the lower force applied to the roller by the loose region and, consequently, the force indicated by the detector associated with that roller does not give an indication of the shape of either the edge or the loose region of the strip.
It is an object of the present invention to provide a method of, and apparatus for, overcoming these difficulties.
According to a first aspect of the present invention, in a method of determining the shape of metal strip rolled in a rolling mill wherein, on leaving a stand of the mill, the strip has tight edge regions with longitudinally extending loose regions inboard of the edge regions and the strip moving in the direction of its length under tension is passed around part of the periphery of a detector roll having a length greater than the width of the strip, said detector roll comprises a plurality of rollers arranged side-by-side and rotatable about an axis which is normal to the direction of movement of the strip and each roller having a detector associated with it for determining the force applied to the roller by the strip, characterised in that either the path taken by the strip relative to the detector roll is adjusted or the axial position of the detector roll relative to the path taken by the strip is adjusted so that at least one of the lateral edges of the strip takes up a predetermined position with respect to the roll such that the edge region and the loose region inboard thereof engage with different rollers.
Alternatively, the strip may be moved laterally with respect to the rolls of the rolling mill
and to the detector roll so that the strip is offset laterally from the usual path through the mill.
With both of these embodiments at at least one edge of the strip the edge and the loose region engage with adjacent rollers.
According to a second aspect of the invention, a detector roll for use in determining the shape of metal strip rolled in a rolling mill comprises a plurality of rollers arranged side-by-side and rotatable about a common axis, each roller having a detector associated with it for determining force applied to the roller by metal strip passing around part of the periphery of the roller, and means for displacing said roll in the direction of said axis.
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 drawing.
A hot metal strip 1 leaving a stand, usually the last stand, of a multi-stand rolling mill is moving in the direction of its length. The strip passes over and engages with the periphery of a detector roll 2 which consists of a plurality of rollers 3 arranged side-by-side and rotatable about an axis 4 of an arbor 4'. Each roller has a detector (not shown) associated with it which detects the force applied to the roller by the portion of the strip engaging it. A detector
roll of this type is well known and is sold by Davy McKee (Poole) Limited, Wallisdown Road, Poole, Dorset BH12 5AG, England under the Trade Mark VIDIMON. A device 7, which may take the form of a fluid operable piston-cylinder device, is coupled to the end of the roll to axially displace the detector roll.
The centre-line of the strip is indicated by reference 5 and, if the roller 3 at the centre of the roll is centred on the centre-line 5, as shown in the upper part of the figure, the outer edge 6 of the strip bears against the periphery of a roller 3 but, depending upon the width of the strip, a part of the periphery of the roller does not have strip bearing against it. The signal obtained from the detector associated with that roller will be different from the signals obtained from other rollers which have strip bearing against them over the entire length of the roller. This can be taken into account when considering the output of the detector.
However, it may be desirable if the tight edge 6 of the strip is arranged to bear against one of the rollers and the part of the strip which bears against the adjacent roller is the inboard region 8 which is subject to "loose" rolling. In this way the tight edge 6 of the strip and the loose region 8 of the strip are on adjacent rollers and their effect can be determined by the appropriate rollers. This is shown
in the lower part of the figure. The detector roll may be displaced axially by the device 7 to bring this about.
As an alternative, the detector roll may be kept in a fixed position and the track taken by the strip through the stands of the rolling mill may be shifted sideways, i.e. off-centre rolling, so that the lateral edge of the strip takes up the predetermined position with respect to the roller against which it engages so that the tight edge and the loose inboard region engage different rollers.
Spray nozzles 9 mounted on a spray bar 10 are employed to cool the work rolls of one or more stands and the sprays are controlled with reference to the strip tension at regions across its width as determined by the detector roll. Conveniently, there are two spray nozzles 9, corresponding to each roller 3, and, by controlling the sprays, particularly those corresponding to the outermost rollers, the coolant applied to the rolls serves to change the contours of the rolls to bring about an improvement in the shape of the strip as it is rolled.
The spray nozzles could, alternatively, be used to spray lubricant on to the strip before it enters into one of the mill stands.
Claims
1. A method of determining the shape of metal strip rolled in a rolling mill wherein, on leaving a stand of the mill, the strip has tight edge regions with longitudinally extending loose regions inboard of the edge regions and the strip moving in the direction of its length under tension is passed around part of the periphery of a detector roll having a length greater than the width of the strip, said detector roll comprising a plurality of rollers arranged side-by-side and rotatable about an axis which is normal to the direction of movement of the strip and each roller , having a detector associated with it for determining the force applied to the roller by the strip, characterised in that either the path taken by the strip relative to the detector roll is adjusted or the axial position of the detector roll relative to the path taken by the strip is adjusted so that at least one of the lateral edges of the strip takes up a predetermined position with respect to the roll such that the edge region and the loose region inboard thereof engage with different rollers.
2. A detector roll for use in determining the shape of metal strip rolled in a rolling mill comprising a plurality of rollers arranged side-by-side and rotatable about a common axis, each roller having a detector associated with it for determining force applied to the roller by metal strip passing around part of the periphery of the roller, and means for displacing said roll in the direction of said axis.
3. A detector roll as claimed in claim 2, in which the displacing means is a fluid operable piston- cylinder device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1990600610 DE69000610T2 (en) | 1989-02-07 | 1990-02-05 | MEASURING THE SHAPE OF METAL STRIP. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB898902621A GB8902621D0 (en) | 1989-02-07 | 1989-02-07 | The measurement of shape of metal strip |
GB8902621.5 | 1989-02-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990009249A1 true WO1990009249A1 (en) | 1990-08-23 |
Family
ID=10651209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1990/000171 WO1990009249A1 (en) | 1989-02-07 | 1990-02-05 | The measurement of shape of metal strip |
Country Status (4)
Country | Link |
---|---|
US (1) | US5161398A (en) |
EP (1) | EP0457784B1 (en) |
GB (1) | GB8902621D0 (en) |
WO (1) | WO1990009249A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2780502A1 (en) * | 1998-06-25 | 1999-12-31 | Kvaerner Metals Clecim | Measuring flatness of product produced as band, particularly applicable to process control in steel mills |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4438885B4 (en) * | 1994-10-31 | 2004-08-26 | Trützschler GmbH & Co KG | Device for measuring the thickness of a fiber structure on a regulating line |
DE10001074A1 (en) * | 2000-01-13 | 2001-07-19 | Sms Demag Ag | Hot rolling mill with flatness measuring roller |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1573698A1 (en) * | 1966-01-25 | 1970-08-13 | Dr Wolfgang Muehlberg | Method for measuring the distribution of tensile stresses over the width of strip-shaped material under longitudinal tension and the associated measuring device |
US3890834A (en) * | 1972-09-11 | 1975-06-24 | Asea Ab | Force or tension measuring means |
GB2138180A (en) * | 1983-04-12 | 1984-10-17 | Ishikawajima Harima Heavy Ind | Strip rolling mills |
GB2160136A (en) * | 1984-05-23 | 1985-12-18 | Achenbach Buschhuetten Gmbh | Apparatus for cold rolling mills for detecting and controlling the flatness of rolled strip |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2766041A (en) * | 1952-08-21 | 1956-10-09 | United States Steel Corp | Apparatus for automatically centering and aligning moving elongated objects |
GB1130588A (en) * | 1965-01-30 | 1968-10-16 | Sumitomo Metal Ind | Method of controlling and apparatus for measuring the flatness of strips |
US3570624A (en) * | 1966-06-27 | 1971-03-16 | Lummus Co | Web tracking and control |
JPS5080860A (en) * | 1973-11-16 | 1975-07-01 | ||
FR2422451A1 (en) * | 1978-04-13 | 1979-11-09 | Usinor | METHOD AND DEVICE FOR CONTROL OF THE FLATNESS OF A COLD ROLLED METAL STRIP |
DE3529364A1 (en) * | 1985-08-16 | 1987-02-19 | Schloemann Siemag Ag | DRIVE DEVICE FOR THE AXIAL SHIFTING OF ROLLS OF A ROLLING DEVICE |
-
1989
- 1989-02-07 GB GB898902621A patent/GB8902621D0/en active Pending
-
1990
- 1990-02-05 WO PCT/GB1990/000171 patent/WO1990009249A1/en active IP Right Grant
- 1990-02-05 US US07/730,869 patent/US5161398A/en not_active Expired - Fee Related
- 1990-02-05 EP EP90902336A patent/EP0457784B1/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1573698A1 (en) * | 1966-01-25 | 1970-08-13 | Dr Wolfgang Muehlberg | Method for measuring the distribution of tensile stresses over the width of strip-shaped material under longitudinal tension and the associated measuring device |
US3557614A (en) * | 1966-01-25 | 1971-01-26 | Wolfgang Muhlberg | Measurements of longitudinal stresses in moving metal bands and devices therefor |
US3890834A (en) * | 1972-09-11 | 1975-06-24 | Asea Ab | Force or tension measuring means |
GB2138180A (en) * | 1983-04-12 | 1984-10-17 | Ishikawajima Harima Heavy Ind | Strip rolling mills |
GB2160136A (en) * | 1984-05-23 | 1985-12-18 | Achenbach Buschhuetten Gmbh | Apparatus for cold rolling mills for detecting and controlling the flatness of rolled strip |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2780502A1 (en) * | 1998-06-25 | 1999-12-31 | Kvaerner Metals Clecim | Measuring flatness of product produced as band, particularly applicable to process control in steel mills |
Also Published As
Publication number | Publication date |
---|---|
EP0457784A1 (en) | 1991-11-27 |
GB8902621D0 (en) | 1989-03-30 |
US5161398A (en) | 1992-11-10 |
EP0457784B1 (en) | 1992-12-16 |
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