GB2036621A - Rolling plant - Google Patents

Rolling plant Download PDF

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Publication number
GB2036621A
GB2036621A GB7942760A GB7942760A GB2036621A GB 2036621 A GB2036621 A GB 2036621A GB 7942760 A GB7942760 A GB 7942760A GB 7942760 A GB7942760 A GB 7942760A GB 2036621 A GB2036621 A GB 2036621A
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GB
United Kingdom
Prior art keywords
coiler
mill
workpiece
roughing mill
pass
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
GB7942760A
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GB2036621B (en
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Davy Loewy Ltd
Original Assignee
Davy Loewy Ltd
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
Application filed by Davy Loewy Ltd filed Critical Davy Loewy Ltd
Priority to GB7942760A priority Critical patent/GB2036621B/en
Publication of GB2036621A publication Critical patent/GB2036621A/en
Application granted granted Critical
Publication of GB2036621B publication Critical patent/GB2036621B/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
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)

Abstract

Rolling plant for hot rolling metal strip or plate comprises a reversing roughing mill (12), a continuous finishing mill (15) spaced from the roughing mill and an intermediate coiler (17) which can be retracted to an inoperative position clear of the pass- line. In the penultimate forward pass of the roughing mill, the coiler (17) is in its inoperative position and the workpiece is rolled to a length greater than the coiler-roughing mill spacing but less than the finishing mill-roughing mill spacing, the leading end of the workpiece passing under the coiler (17). In the final forward pass, the coiler (17) is in its operative position on the pass-line and effects coiling of the workpiece. Subsequently, the coil is uncoiled and led out to the finishing mill (15). The coiler can alternatively be horizontally movable between operative and inoperative positions, or can be fixed in position but incorporate an adjustable deflector. <IMAGE>

Description

SPECIFICATION Rolling method and apparatus This invention relates to the rolling of hot metal workpieces, e.g. strip or plate, in rolling mill plant comprising a reversing roughing mill and a continuousfinishing mills.
U.K. patent specification No. 1373375 describes the rolling of workpieces in such rolling mill plant employing in addition a coiler located between the roughing and finishing mill. According to that specification, on the third last pass of the hot metal workpiece through the roughing mill (the penultimate pass in the forward direction towards the finishing mill), the workpiece is rolled towards the coilerto a length less than the spacing between the roughing mill and the coiler, and, on the last pass, the workpiece is rolled to a length greater than that spacing and is first coiled in the coiler, and then uncoiled and delivered to the finishing mill.
The requirement that, in the penultimate forward pass in the roughing mill, the workpiece must be rolled to a length less than the roughing mill-coiler spacing is a restriction on the plant and on the rolling operation, although with the arrangement illustrated in specification No. 1373375, it is a requirement that cannot easily be avoided. Because of that requirement, either the length of the strip that can be rolled in the rolling mill plant is limited, or the roughing mill-coiler spacing becomes unduly large and the plant is expensive in capital cost.
In the present invention, the restrictions of the above-mentioned specification are avoided or mitigated by arranging that the workpiece can pass from the roughing mill towards the finishing mill without being obstructed by the coiler. Then, the workpiece can be rolled in the penultimate forward roughing pass to a length exceeding the roughing mill-coiler spacing, the coiler being at that time inoperative and the leading end oftheworkpiece extending to the finishing mill side of the coiler location. For the final roughing pass, the coiler is rendered operative and the workpiece coiled in the coiler as it is rolled out by the roughing mill.
Thus, according to the present invention, a method of hot rolling a metal workpiece in a reversing roughing mill followed by a continuous finishing mill with a coiler between those mills comprises the steps of rolling the workpiece in the roughing mill in a series of passes to a gauge for entry to the finishing mill; prior to the penultimate forward pass bringing the coiler into an inoperative condition in which the workpiece can pass the coiler position without obstruction; in the penultimate forward pass rolling the workpiece in the roughing mill to a length exceeding the spacing of the coiler from the roughing mill but less than the spacing of the finishing mill from the roughing mill; after the workpiece has been reversed to clear the coiler position, bringing the coiler into an operative condition for coiling; in the last forward pass coiling the workpiece by the coiler; and then uncoiling the workpiece to the finishing mill. In this specification and claims a "forward pass" means a pass in the direction of the finishing mill.
The invention aiso provides a rolling mill plantfor performing the above method comprising a reversing roughing mill, a continuous finishing mill spaced from the roughing mill, conveying means for conveying workpieces rolled by the roughing mill towards and away from the finishing mill; a coiler located between the roughing mill and the finishing mill for coiling workpieces from the roughing mill and uncoiling the workpieces to the finishing mill, the coiler being movable upwardly and downwardly between an operative position in which a workpiece fed thereto is coiled and an inoperative position in which a workpiece can pass the coiler unobstructed thereby; and means for moving the coiler between the operative and inoperative positions.Alternatively, the plant may comprise a reversing roughing mill, a continuous finishing mill spaced from the roughing mill, conveying means for conveying workpieces rolled by the roughing mill towards and away from the finishing mill, a coiler located between the roughing mill and the finishing mill for coiling workpieces from the roughing mill and uncoiling the workpieces to the finishing mill, the coiler having deflector means movable between a first disposition, in which a workpiece fed from the roughing mill is directed to the coiler, and a second disposition, in which a workpiece fed from the roughing mill passes the coiler without obstruction.
Preferably, the workpiece is rolled in the third last forward pass of the roughing mill to a length which is less than the spacing between the roughing mill and the position of the coiler when in its operative condition.
The invention will be more readily understood by way of example from the following description of rolling mill plant and its operation, reference being made to the accompanying drawing, in which the four figures shows the plant in successive stages of the operation.
The rolling mill plant comprises basically a reversing roughing mill 12 illustrated by work rolls 13 and back-up rolls 14 and a continuous finishing mill 15 represented by the rolls of the first three stands 1 5A, 1 SB and 1 so. The roughing mill 12 and the finishing mill 15 are spaced apart in the direction of the common pass-line, and between them in a sequence of driven table rollers 16 forming conveying means by which a workpiece rolled out by the roughing mill 12 towards the finishing mill 15 can be traversed in either direction. Between the roughing mill and the finishing mill is a mandrel-less coiler 17 which is generally as described and illustrated in U.K. patent specification No. 1373375 except as hereinafter described.The arrangement of roughing mill, coiler and finishing mill is thus as shown in Figure 4 of that specification.
The coiler 17 differs from that of the above mentioned specification by being carried by a frame 18 which is mounted in slideways 20 at each side.
Piston and cylinder assemblies, one of which is illustrated at 21, are effective to move the coiler 17 between an inoperative position shown in Figures 1 and 2, in which the coiler is raised above the pass-line of the table rollers 16, and an operative position shown in Figures 3 and 4, in which the coiler is on that pass-line and can coil hot rolled slab conveyed on the rollers 16. As will be observed there are two table rollers 16A aligned with the other rollers 16 and located beneath the coiler 17.
The coiler 17 is as shown in Figure 6 of U.K. patent specification No. 1373375 to which reference should be made for a detailed explanation of its construction and operation. The coiler has a set of bending rolls 22, a driven cradle roll 23 which cooperates with two further driven cradle rolls 24 on the pass-line, a pinch-roll 25 which is carried on a pivotable lever 26 and which cooperates with a second pinch roll 27 on the pass-line, and deflection or guide plates 28.
Each new slab is hot rolled in roughing mill 12 in a series of reversing passes, such that after the fifth last pass (the third last pass in the forward direction towards the coiler), the resulting rolled slab occupies most of the roller table between the mill 12 and the coiler 17, but has a length less then the separation of the coiler from the mill 12; the strip S1 after that pass is shown in Figure 1. At that stage, or before, the coiler is raised to its inoperative position as shown.
In the penultimate forward pass of the slab, the coiler 17 is still in its inoperative position and the rolled slab S2 has been rolled down to a length which exceeds the separation of the coiler 17 from the roughing mill 12, but is less than the separation of the first stand 1 5A of the finishing mill from the roughing mill. As the slab is run out from the roughing mill its leading end passes unobstructed under the coiler, being supported beneath the coiler by the rollers 16A (Figure 2).
The slab S2 is next reversed for the final rearward pass. As soon as the slab clears the coiler position, the piston and cylinder assemblies 21 are operated to bring the coiler into its operative position, and at the same time the lever 26 is operated to bring the upper pinch roll 25 into its working position adjacent the lower pinch roll 27, but slightly displaced from it in the direction of the roughing mill (Figure 3).
In the final forward pass, the slab is rolled out at length exceeding the finishing mill - roughing mill spacing. As the leading end in that pass approaches the coiler, it is gripped between, and deflected upwards by, the pinch rolls 25, 27 and is directed between guide plates 28 and to the bending rolls which form the rolled slab S3 into a coil C on the driven cradle rolls 24 as described in the said patent specification. As soon as the leading end reaches the bending rolls, pinch roll 25 can be raised away from pinch roll 27 a small extent and then acts to guide the rolled slab. When the tail of the slab is detected, the cradle rolls are decelerated and come to rest with the tail end above the cradle rolls.The cradle rolls are subsequently driven in the opposite direction to pay out the rolled slab, as indicated at S4 in Figure 4, towards the finishing stand 15 which rolls the slab down to strip or plate. After the coil C has been formed on the cradle rolls 24, the coiler 17 can be retracted into its inoperative position to allow the next slab to pass under it when the coil C has been exhausted.
Because in the penultimate forward pass, the coiler being in its inoperative position does not impede the movement of the slab past the coiler position, the length of the slab rolled out in that pass is limited only by the separation between the roughing mill and the first stand of the finishing mill.
Compared with the rolling operation of British Patent specification No. 1373375, the length of slab rolled out in the final pass, and hence the slab weight, can be increased with the same spacing of roughing mill and finishing mill; or, with the same slab weight, the roughing mill-finishing mill spacing can be decreased. By using a retractable coiler it is thus possible to achieve better operating efficiency, or a capital cost saving, or both.
The vertically retractable coiler 17 shown in the accompanying drawing is only one example of a coiler that can alternatively be rendered operative or inoperative. Instead of the arrangement shown, the coiler 17 may be movable horizontally transversely of the pass-line to bring in into inoperative condition out of the pass-line. Further, the coiler may remain fixed in position on the pass-line but have an adjustable deflector, which in one position deflects the slab into the coiler as described and in another position allows the slab to pass unobstructed under the coiler on the table rollers 16A.For that purpose the guide plates 28 may be hinged so as to retract upwardly; when the slab is to pass unobstructed through the coiler both the upper pinch roll 25 and the guide plates 28 are moved upwardly out of the path of the workpiece, but, when coiling is to be effected on the final forward pass, pinch roll 25 and the guide plates are brought to the positions shown in Figure 3. In a further arrangement using a fixed coiler, the guide plates 28 are disposed above the path of slabs on the table rollers 16 to allow a slab to pass beneath them when the upper pinch roll 25 is raised by pivoting the lever 26; when pinch roll 25 is lowered to its operative position adjacent to pinch roll 27 but offset in the direction of the roughing stand as shown in Figure 3, the workpiece Sg is directed between the guide plates and hence to the coiling mechanism constituted by the bending rolls 22 and cradle rolls 23 and 24.

Claims (10)

1. A method of hot rolling a metal workpiece in a reversing roughing mill followed by a continuous finishing mill with a coiler between those mills, the method comprising the steps of rolling the workpiece in the roughing mill in a series of passes to a gauge for entry to the finishing mill; priortothe penultimate forward pass bringing the coiler into an inoperative condition in which the workpiece can pass the coiler position without obstruction; in the penultimate forward pass rolling the workpiece in the roughing mill to a length exceeding the spacing of the coiler from the roughing mill but less than the spacing of the finishing mill from the roughing mill; after the workpiece has been reversed to clear the coiler position, bringing the coiler into an operative condition for coiling; in the last forward pass coiling the workpiece by the coiler; and then uncoiling the workpiece to the finishing mill.
2. A method of hot rolling a metal workpiece according to claim 1, in which the coiler is retracted out of the pass-line of the mills in order to bring it into the inoperative condition and is returned to the pass-line to bring it into operative condition.
3. A method of hot rolling a metal workpiece according to claim 2, in which the coiler is moved vertically between the operative and inoperative conditions.
4. A method of hot rolling a metal workpiece according to claim 2, in which the coiler is moved horizontally between the operative and inoperative conditions.
5. A method of hot rolling a metal workpiece according to claim 1, in which the coiler remains in the same position in the operative and inoperative conditions and deflector means are moved to a first position to direct the workpiece to the coiler to bring the coiler into operative condition and are moved to a second position, in which the workpiece can pass the coiler unobstructed and without being coiled, to bring the coiler into inoperative condition.
6. Rolling mill plant for performing the method of claim 3, comprising a reversing roughing mill, a continuous finishing mill spaced from the roughing mill, conveying means for conveying workpieces rolled by the roughing mill towards and away from the finishing mill; a coiler located between the roughing mill and the finishing mill for coiling workpieces from the roughing mill and uncoiling the workpieces to the finishing mill, the coiler being movable upwardly and downwardly between an operative position in which a workpiece fed thereto is coiled and an inoperative position in which a workpiece can pass the coiler unobstructed thereby; and means for moving the coiler between the operative and inoperative positions.
7. Rolling mill plant for performing the method of claim 5, comprising a reversing roughing mill, a continuous finishing mill spaced from the roughing mill, conveying means for conveying workpieces rolled by the roughing mill towards and away from the finishing mill; a coiler located between the roughing mill and the finishing mill for coiling workpieces from the roughing mill and uncoiling the workpieces to the finishing mill, the coiler having deflector means movable between a first disposition, in which a workpiece fed from the roughing mill is directed to the coiler, and a second disposition, in which a workpiece fed from the roughing mill passes the coiler without obstruction.
8. Rolling mill plant according to claim 7, in which the deflector means include a guide plate which leads to coil forming means of the coiler and which in the operative disposition lies in the workpiece path on the conveyor means and which in the inoperative disposition is displaced from that path.
9. A method of hot rolling a metal workpiece, substantially as herein described with reference to the accompanying drawings.
10. Rolling mill plant substantially as herein described, particularly with reference to the accompanying drawings.
GB7942760A 1978-12-12 1979-12-12 Rolling plant Expired GB2036621B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7942760A GB2036621B (en) 1978-12-12 1979-12-12 Rolling plant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7848185 1978-12-12
GB7942760A GB2036621B (en) 1978-12-12 1979-12-12 Rolling plant

Publications (2)

Publication Number Publication Date
GB2036621A true GB2036621A (en) 1980-07-02
GB2036621B GB2036621B (en) 1982-12-15

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088745A1 (en) * 1982-03-05 1983-09-14 VOEST-ALPINE Aktiengesellschaft Hot rolling plant for strip-like or sheet-like stock
EP0321733A1 (en) * 1987-12-18 1989-06-28 Fried. Krupp Gesellschaft mit beschränkter Haftung Production of hot-rolled strip from a continuously cast material
GB2254275A (en) * 1991-04-06 1992-10-07 Bwg Bergwerk Walzwerk Eliminating defects in rolled steel strip

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088745A1 (en) * 1982-03-05 1983-09-14 VOEST-ALPINE Aktiengesellschaft Hot rolling plant for strip-like or sheet-like stock
US4497191A (en) * 1982-03-05 1985-02-05 Voest-Alpine Aktiengesellschaft Plant and process for hot-rolling strip or plate stock
EP0321733A1 (en) * 1987-12-18 1989-06-28 Fried. Krupp Gesellschaft mit beschränkter Haftung Production of hot-rolled strip from a continuously cast material
GB2254275A (en) * 1991-04-06 1992-10-07 Bwg Bergwerk Walzwerk Eliminating defects in rolled steel strip
FR2674778A1 (en) * 1991-04-06 1992-10-09 Bwg Bergwerk Walzwerk METHOD AND DEVICE FOR REMOVING THE TREND IN FORMING WINDING PLIERS ON HOT - RUNNING OR RECLAIMED CARBON STEEL STRIPS.
GB2254275B (en) * 1991-04-06 1994-09-14 Bwg Bergwerk Walzwerk A process and a device for eliminating the propensity for coil break formation of hot or annealed carbon steel strip

Also Published As

Publication number Publication date
GB2036621B (en) 1982-12-15

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PCNP Patent ceased through non-payment of renewal fee