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EP0896840B1 - Walzwerk, walzverfahren und walzanlage - Google Patents

Walzwerk, walzverfahren und walzanlage Download PDF

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Publication number
EP0896840B1
EP0896840B1 EP96908338A EP96908338A EP0896840B1 EP 0896840 B1 EP0896840 B1 EP 0896840B1 EP 96908338 A EP96908338 A EP 96908338A EP 96908338 A EP96908338 A EP 96908338A EP 0896840 B1 EP0896840 B1 EP 0896840B1
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EP
European Patent Office
Prior art keywords
rolling
mill
rolls
roll
work rolls
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.)
Expired - Lifetime
Application number
EP96908338A
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English (en)
French (fr)
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EP0896840A4 (de
EP0896840A1 (de
Inventor
Toshiyuki Wakou Mansion Room 201 KAJIWARA
Yoshihiko Iida
Yasutsugu Yoshimura
Kouichi Seki
Ryohei Kinose
Mitsuo Nihei
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Hitachi Ltd
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Hitachi Ltd
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Publication of EP0896840A4 publication Critical patent/EP0896840A4/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • 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
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B13/023—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally the axis of the rolls being other than perpendicular to the direction of movement of the product, e.g. cross-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/021—Twin mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/028—Sixto, six-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/12—Axial shifting the rolls
    • B21B2269/16—Intermediate rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/06—Threading
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands
    • 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
    • B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
    • 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
    • B21B39/14—Guiding, positioning or aligning work
    • B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass

Definitions

  • the invention relates to a rolling mill according to the preamble of claim 1 and claim 2, respectively.
  • rolling techniques can be divided into two methods; reverse rolling methods and tandem rolling methods.
  • hot rolling of carbon steel there is a reversible rough rolling mill and a five to seven stand tandem-type finishing mill.
  • a rough rolling mill and a reversing finishing mill having furnace coilers on each side referred to as “Steckel Mills", are the most common.
  • cold rolling mills are divided into two types: tandem mills for large-scale production; and reverse rolling mills for small-scale production.
  • JP-U 59-30308 for rolling steel bars and wire into cylindrical shapes, a thrust mechanism for regulating shifts of the center of cylinders is provided that improves precision of cylinder centering using spherical-shaped supports.
  • a tilting member is provided at a sliding surface of a roll chock and a housing in order to dramatically reduce the frictional resistance during raising and lowering of roll chocks for both the work rolls and the back-up rolls to improve the rolled material thickness and strip shape.
  • Reverse rolling is carried out using single rolling mills and one would assume if two rolling mills are used then approximately twice the production volume should be possible. The reasons that this has not been achieved are as follows:
  • the inter-stand distance is approximately 6 meters.
  • the leading end of the rolling material is then sent from one stand to the next stand, the strip walks and bends so the pass center is displaced from the center and difficulty occurs in biting at the next stand.
  • biting is carried out offset from the center, strip curving and strip walking occurs, and strip threading does not go well, resulting in a poor strip profile and thickness.
  • each stand carries out rolling in one direction so strip thickness does not change in one stand of the mill and controlling strip walking is therefore not too difficult.
  • the pass direction changes in reverse rolling methods so that the thickness of the strip being rolled becomes thinner with each pass, i.e. the rolling conditions change.
  • the reduction levelling operation therefore has to be carried out to a high degree of skill and precision, and if the most appropriate level control is not carried out, the strip will walk.
  • Coilers are provided at the front and rear of a reverse cold rolling mill for coiling and uncoiling during rolling. During this time it is usual for the trailing end of the strip to remain wound onto the coiler. The yield can be improved if the ends of the strip are rolled but strip end passing and recoiling on of the strip then becomes very time-consuming, so the productivity falls.
  • the distance between the centers of the stands can be brought down from 6m to 3.5m. Even with this distance side guides are still required for guiding the plate. However, this configuration calls for an airtight space in between the two stands so operation and maintenance becomes troublesome.
  • EP-A-0 065 936 discloses as closest prior art a rolling mill comprising a four-high rolling mill of the twin type, in which two roll groups, each having two work rolls and two back-up rolls, are arranged in a single roll housing. For a successful reverse rolling it is absolutely essential to control each roll group individually.
  • JP-A-05-177214 there is shown a rolling mill with a twin duo stand.
  • the rolls of the stand are individually mounted in chocks, whereby chocks of adjacent rolls are provided with a lateral tongue and groove arrangement to enable them to engage one another.
  • JP-A-07-308701 there has been known an arrangement comprising a continuous caster, a twin stand four-high roughing mill, a shear, an oven and a tandem rolling mill comprised of three six-high stands.
  • the object of the invention is to provide an easily maintainable rolling mill of a high degree of rolling efficiency with a minimized distance between two sets of roll groups and in which rolled strip walking and bending are suppressed.
  • a rolling mill of the invention comprises a four-high rolling mill as defined in claim 1, equipped with roll groups composed of upper and lower work rolls above and below a rolling material and upper and lower back-up rolls supporting said upper and lower work rolls, respectively, with two said roll groups housed within a single roll housing with driving taking place at one side in an axial direction of said roll groups and operating taking place on the remaining side.
  • the metal chocks of said work rolls support two work rolls as a single body on upper and lower sides and on separate driving an operating sides.
  • Another rolling mill of the invention comprises a six-high rolling mill as defined in claim 2, equipped with roll groups composed of upper and lower work rolls above and below a rolling material, upper and lower intermediate rolls supporting said upper and lower work rolls, respectively, and upper and lower back-up rolls supporting said upper and lower intermediate rolls, respectively, with two said roll groups housed within a single roll housing with driving taking place at one side in an axial direction of said roll groups and operating taking place on the remaining side.
  • At least the metal chocks of said work rolls support two work rolls as a single body on upper and lower sides and on separate driving and operating sides.
  • intermediate rolls or back-up rolls are driven for rolling.
  • a hot rolling installation of the invention as defined in claim 21 is equipped with a roughing mill and a finishing mill, with said hot-rolling installation rolling hot material at said finishing mill or rolling a slab cast at a thin slab, casting as is at a finishing mill.
  • the finishing mill comprises a rolling mill as claimed in claim 1 or 2.
  • a hot rolling installation of the invention can be equipped with two of such finishing mills being arranged in tandem.
  • FIG. 1 is a front cross-sectional view of a four-high twin mill constituting a first embodiment of the present invention.
  • FIG. 2 is a front cross-sectional exploded view of the four-high twin mill constituting the first embodiment of the present invention.
  • FIG. 3 is a front cross-sectional exploded view of a six-high twin mill constituting the first embodiment of the present invention.
  • FIG. 4 is a view showing results of measuring coefficient of friction with respect to work roll surface hardness.
  • FIG. 5 is a view showing results of measuring coefficient of friction with respect to inter-roll slip ratio
  • FIG. 6 is a view showing an example of a related hot-rolling installation.
  • FIG. 7 is a view showing a cold rolling installation employing the twin mill constituting the first embodiment of the present invention in reversing method cold finishing rolling.
  • FIG. 8 is a view showing a hot rolling installation employing a thin slab continuous casting and a related six stand tandem mill.
  • FIG. 9 is a view showing a hot rolling installation employing a thin slab continuous casting and the twin mill of the present invention.
  • FIG. 10 is a view showing a hot rolling installation constituting the first embodiment of the present invention.
  • FIG. 11 is a view showing a hot rolling installation constituting the first embodiment of the present invention.
  • FIG. 12 is a view showing a hot rolling installation constituting the first embodiment of the present invention.
  • FIG. 13 is a view showing a hot rolling installation constituting the first embodiment of the present invention.
  • FIG. 14 is a view showing a hot rolling installation constituting the first embodiment of the present invention.
  • FIG. 15 is a plane view showing a mechanism for thrust bearing in the axial direction of the back-up rolls of the twin mill of the present invention.
  • FIG. 16 is a view showing a configuration of a reversing twin mill constituting the first embodiment of the present invention.
  • FIG. 17 is a view showing a configuration of a related reversing mill.
  • the present invention is for supplying two sets of roll groups within a single housing in such a manner that a spacing of the centers of the two sets of roll groups is dramatically reduced with respect to that of the preceding example to 1.5 meters or less.
  • This type of rolling mill is abbreviated to a "twin mill".
  • twin mill a distance between stands is one quarter of the 6 meters of the usual tandem example and approximately 40 percent of the 3.5 meters of the close tandem mill.
  • amount of strip walking of a strip is approximately proportional to the square of the distance between stand, a 94% reduction in strip walking from the tandem mill configuration is shown in Table 1.
  • method inter-stand distance maximum amount of strip walking side guide usual tandem mills 6 m ⁇ 40mm (assumed) necessary close tandem mills 3.5m ⁇ 13.6mm necessary method of the present invention (twin mill) 1.5m ⁇ 2.5mm unnecessary
  • a usual tandem mill has a distance between stands of 6 m and an assumed maximum extent of strip walking of ⁇ 40mm and therefore requires side guides.
  • a close tandem mill has a distance between stands of 3.5 m and a maximum extent of strip walking of 13.6 mm and therefore also requires side guides.
  • the distance between stands that is the distance between the two sets of rolls is 1.5 m and the maximum extent of strip walking is ⁇ 2.5 mm, so that side guides are not required.
  • the invention is extremely effective in reducing the distance between stands placement of a strip guide and strip tension meter is problematic.
  • strip threading guides can be formed as one piece, the strip protrudes so as to ensure that there are no discontinuities so that it does not tumble or turn around. Even if problems do occur, the housing does not interfere.
  • Trailing end curving starts from the strip material slipping at the previous roll group and when the distance between two roll groups is short the place for this phenomena to occur no longer exists. Further, when the distance between two roll groups is long, strip curving occurs proportionally to approximately the cube of the tail extraction distance.
  • FIG. 1 shows an example where the present invention is realized as a four-high rolling mill and FIG. 2 is an enlarged view of same.
  • Two sets of four-high roll groups (No. 1 mill and No. 2 mill from the side of insertion of rolling material) are installed in a single housing 1.
  • Upper back-up roll 2, upper work roll 3, lower back-up roll 2' and lower work roll 3' make up one roll group set, with two sets within the housing 1, so as to give a total of four back-up rolls and four work rolls.
  • a set of one roll group then consists of an upper and lower work roll and an upper and lower back-up roll.
  • Single piece metal chocks 4 and 4' are installed on each of the two upper work rolls 3 and the two lower work rolls 3'.
  • Strip threading guides 5 and 5' attached to the single piece metal chocks 4 and 4', respectively, can be moved up and down with respect to changes in the diameter of the work rolls using a screw 29 attached to the single piece metal chocks 4 and 4' in such a manner as to adjust the distance between the work rolls.
  • the strip threading guides 5 and 5' allow easy threading of the slab between the two sets of rolls.
  • Numeral 6 indicates a tension meter roll provided approximately midway between the two sets of rolls and numeral 7 indicates weighing scales for measuring tension.
  • Control of tension can then be easily carried out by measuring the tension occurring at the center of the sets of rolls using the tension meter roll 6 and the weighing scales 7.
  • Pipes 9 and 9' supply cooling water or roll coolant fluid that both cools and lubricates.
  • Bearings 10 and 10' built-in at the metal chocks for use with the upper and lower back-up rolls receive the rolling load and transmit this force to the housing 1 via reducing equipment 30 that applies this rolling load to the back-up rolls.
  • Rolling material 22 flows in a direction from the upper left to the right of the drawings and is rolled by the twin mill.
  • Numeral 11 and numeral 11' indicate pistons for use as roll balance dual operation roll benders.
  • the pistons 11 and 11' move the single piece metal chocks 4 and 4' up and down.
  • Numeral 12 and numeral 12' indicate fixed pistons, for moving cylinders 17 and 17' in the pass direction using hydraulic pressure, so as to press the single piece metal chocks from both sides via cylindrical or spherical supports 13 and 13'.
  • Numeral 15 indicates a wheel for use in rearranging of work rolls.
  • the lower back-up rolls 2' are lowered, the lower work rolls 3' are also lowered.
  • the lower work rolls 3' are then brought in and out axially in the direction of the rolls via rail 14 and it's metal chocks 4' supported by stepped parts of the wheels 15.
  • the metal chock 4 of the upper work roll is supported by a sliding stopper 18 formed as one piece with the wheel 15, so as to exchange both bottom and top work rolls simultaneously.
  • Reducing equipment 30 is provided independently for the No. 1 mill and the No. 2 mill so both mills can independently carry out reducing operations.
  • the screw 21 adjusts a pass line height (pass line) that is the height at which the rolling material flows.
  • the work rolls are also capable of cross rolling.
  • lubricant is supplied from a pipe 16 to the surface of the back-up roll in order to alleviate thrusting force when the work roll is crossed with respect to the back-up roll.
  • the cylinders 17 and 17' are made to move in a direction opposite to the direction of the strip pass using hydraulics.
  • the upper and lower work rolls are crossed in opposite directions via the one piece chocks 4 and 4' and the strip crown/strip shape can be controlled.
  • the cylindrical supports 13 and 13' are taken to be spherical supports responding to corresponding inclination in the vertical and horizontal directions.
  • two metal chocks etc. for that other than rolls are provided on a working side and a driving side, and in the case of cross rolling the cylinders 17 and 17' are made to move in opposite directions on the driving side and the working side.
  • FIG. 1 and FIG. 2 the providing of strip threading guides and cooling water pipes at the left side of the No. 1 mill (strip entry side) and the right side of the No. 2 mill (strip exit side) is preferred.
  • a cross method where each of the roll axes for the back up rolls and the work rolls are kept parallel is also possible by halting supplying from the pipes 16 and 16' of a lubricant supplying device and also providing horizontal direction shifting equipment at the back-up roll chocks.
  • the thrust in the axial direction does not change from that for usual methods if keeper plates are provided at the entry side and exit side of the single piece metal chocks, but with the back up rolls, in normal operation, keeper plates can only be provided at one side of the back-up roll chocks and there is the danger that offset loads will be exerted upon the thrust bearing.
  • this can be resolved by providing keeper plates 52 at the center of each of the back-up roll metal chocks 10.
  • the keeper plates 52 are supported by a bracket 53 fixed to the housing 1, engage with a roll bearing 50 attached to the front end of a thrust arm 51 fixed to the metal chock 10 for use with the back-up rolls, and transmits thrust generated at the back-up rolls 2 to the housing 1.
  • FIG. 3 shows a twin mill of a six-high mill configuration.
  • FIG. 1 and FIG. 2 The point of distinction with the four-high mill configuration of FIG. 1 and FIG. 2 is that two upper and two lower intermediate rolls 19 and 19' are provided.
  • intermediate roll chocks 26 and 26' are also used in common as a one piece.
  • the shift position of the intermediate rolls of the two rolling mills is the same but operation is not inconvenienced as this position is mainly decided by the rolling material strip width.
  • the driving rolls are usually the work rolls but when it is preferable for the diameter of the work rolls to be small the intermediate rolls are made to perform the driving.
  • the production capacity of a typical hot strip mill having a tandem method finishing mill is three to six million tons per year.
  • an installation having one roughing mill 40 and a finishing mill of one reverse rolling mill 47 has a production of six hundred to eight hundred thousand tons for carbon steel rolling.
  • a cast slab is rolled to a thickness of approximately 200 mm by the roughing mill 40.
  • the rolled material is then coiled on by a coiler 41.
  • the rolled material is then coiled and uncoiled by a coiler/uncoiler 42 and reverse rolling is then performed by the reverse rolling mill 47.
  • FIG. 7 shows the twin mill of the present invention applied to a reversing finishing mill.
  • a cast slab is rolled to a thickness of approximately 25 mm by the roughing mill 40.
  • the rolled material is then wound on by a coiler 41.
  • the rolled material is then wound and unwound by a coiler/uncoiler 42 and reverse rolling is then performed by a reverse twin mill 48 of the present invention.
  • Step Mills In the case of normal steel strip rolling, related reversing mills referred to as “Steckel Mills” were limited to using high pressure water in descaling in order to reduce the temperature of the strip material which caused problems regarding surface quality. This means that these related mills were used primarily for stainless materials. However, in the present invention this problem has been resolved by reducing the number of passes by half and application to carbon steel strips is therefore also possible.
  • board passing/tail extraction speed can be made quicker than in the related art and the drawback of substantial lowering of the temperature at the leading and following ends of a coil in the related method can be substantially improved.
  • the twin mill of the present invention sets out to dramatically improve this problem and provides a method that can be made use of with both normal steel and stainless steels.
  • the guide between mills is an important element, particularly with reversing methods and as the work roll chock one piece method is used, the guide has to be continuous without breaks and without leading end protrusions.
  • a slab is rolled to a thickness of approximately 50 to 70 mm by a thin slab continuous caster 45 and this rolled material is then wound on by the coiler 41.
  • the rolled material is then unwound from an uncoiler 43 and rolled for finishing by a six stand tandem mill.
  • a four-high rolling mill is arranged in an order from the rolling material input side of No. 1 stand 60, No. 2 stand 61, No. stand 62, No. 4 stand 63, No. 5 stand 64 and No. 6 stand 65.
  • the time that is allowed to pass for descaling not to be required is less than six seconds.
  • the temperature is made to rise using an inductance heater etc. at the finishing mill input side so as to provide descaling via entry to the finishing mill.
  • the time from exiting the No. 1 finishing mill to entering the No. 2 finishing mill is in excess of 7 seconds for a distance of 5m, and the passage of time is further increased when the reducing rate of No. 1 is still lower or the continuous casting speed is slower than 5m per minute. Descaling is therefore required and maintaining the finishing temperature (850 .C to 900°C) becomes difficult continuous cast roughing mill No. 1 descaling roughing mill No. 2 finishing mill No. 1 finishing mill No. 2 finishing mill No.
  • the twin mill of the present invention can dramatically reduce this to 2.2 seconds.
  • a slab is rolled thinly to a thickness of 50 to 70mm by the thin slab continuous caster 45, with this rolled material being wound on by the coiler 41.
  • This rolled material is then unwound by the uncoiler 43 and then rolled for finishing by a four-high twin mill 49 that is the twin mill of the present invention.
  • one four-high twin mill of the present invention is arranged as a finishing rolling mill.
  • the slab from the thin slab continuous caster 45 prefferably, for the slab from the thin slab continuous caster 45 to he rolled for finishing as is without being coiled.
  • the number of stands in a hot finishing tandem mill is 4 to 7, with examples of configurations of 6 to 7 being particularly common.
  • Table 3 shows an example of a rolling schedule for rolling to a minimum strip thickness of 1.2 mm at a hot strip mill comprising six finishing mills.
  • rolling to 1.2mm can easily be achieved with a configuration comprising three usual rolling mills and one twin mill.
  • a slab cast by a continuous casting 46 is rolled to a thickness of approximately 25 mm by the roughing mill 40. This rolled material is then wound on to the coiler 41 and then wound out to the finishing mill side from the uncoiler 43.
  • the rolled material unwound from the uncoiler 43 is then rolled for finishing by three conventional rolling mills (No. 1 stand 60, No. 2 stand 61 and No. 3 stand 62) and a four-high twin mill 49 of the present invention.
  • a small diameter is a radius of less than approximately 450 mm.
  • a work roll of a diameter of 700 to 800 mm has been generally used in a conventional hot strip mill for the following reasons.
  • the present invention will confirm that sufficient reduction can be obtained using small diameter work rolls for back-up roll driving (the same as for intermediate roll driving).
  • a work roll radius is taken to be Rw
  • a coefficient of friction between a work roll and a material is taken to be ⁇ b
  • a coefficient of friction between a driver roll and a work roll is taken to be M r.
  • ⁇ h b is one quarter or less of ⁇ hr and the actual amount of reduction is decided to be ⁇ hb if measures such as rolling after strip threading and making a leading end of cover material thinner are not carried out.
  • the coefficient of friction ⁇ b of the work rolls and the leading end of the strip has a strong correlation with the hardness of the surface of the rolls with the work roll surface hardness within the practical range, with ⁇ b falling as the roll hardness rises. Keeping ⁇ b equal to or less than HS70 is preferable at the previous stage mill when a large amount of biting is required to keep ⁇ b at 0.33.
  • the coefficient of friction Mr. between a work roll and a driver roll (for example, an intermediate roll) is generated by slipping between the rolls and with a slip ratio of approximately 1%, in the case of water cooling, a maximum value of 0.3 is reached.
  • Mr. 0.25%.
  • B indicates strip thickness and S indicates flow stress.
  • the method put forward here simply sets the bender force of already existing work rolls to above a certain value without adding new equipment.
  • the coefficient of friction Mr. cannot be set to be large.
  • the frictional force is important however, and is the load between the rolls multiplied with Mr.
  • the load between the rolls is the total of the rolling load and the work roll bender (or roll balance) force.
  • FIG. 10 For comparison with a related method for a hot finishing tandem mill such as the series of finishing mills of FIG. 8, an example of a twin mill arranged as a rear stage is shown in FIG. 10 and an example where two twin mills constitute the entire configuration is shown in FIG. 11.
  • twin mills of the present invention are provided, for which two four-high twin mills 49 and one six-high twin mill 66 is preferred.
  • At least one four-high twin mill 67 is provided at the front part constituting the input side of the series of finishing mills for the rolled material as shown in FIG. 13 and FIG. 14 and for a six-high twin mill 66 to be provided at the rear part constituting the output side of the series of finishing mills.
  • the work roll diameter of the four-high twin mill provided at the front part is preferable for the work roll diameter of the six-high twin mill provided at the rear part to be made small.
  • a large diameter is shown to be a diameter that exceeds 450mm and a small diameter is shown to be a diameter less than or equal to 450mm.
  • Steps for making a work roll diameter small are described above but if the biting problem and the rolling power transmission problem can be resolved, a small diameter work roll is extremely advantageous from the point of view of strong reduction force and economical use of energy and a twin mill can be configured using a rolling mill of a method for which control performance of strip crown and strip shape can be sufficiently guaranteed.
  • the biggest feature of reversing cold rolling installations is that production of rolled steel strip can be started using little investment in equipment.
  • Expansion to a second and third machine is possible by expanding structures that are firstly constructed from one machine.
  • the strip of the first pass is sent to a coiler (reel) without being rolled and the leading end is bitten by a reel grip so as to be wound onto one or two coiling reels.
  • the strip is then subjected to depression of a rolling mill and rolling commences.
  • portions that are not rolled are left at the leading and following ends of the strip so that the tail end of the strip remains wound about the reel, with these remaining portions then becoming scrap.
  • tandem mill requires a great deal of investment compared with a reversing mill and for this reason alone a tandem mill is often not selected.
  • the twin mill is the perfect solution to these requirements.
  • FIG. 7 shows a four-high twin mill of the present invention employs a reversing method for finishing rolling, where rolled material is moved backwards and forwards by the coiler/uncoiler 42 and reverse-rolled for finishing by the four-high reverse twin mill 48.
  • a twin mill comprising a six-high rolling mill commonly referred to as a HC mill or UC mill of superior performance is preferred for cold rolling.
  • twin mills can be considered to be two stand tandem mills of superior strip threading/tail extraction as described previously.
  • leading and trailing ends of a rolled coil are cut by a usual travelling shears and this portion is then cooled for hardening so that when the returning sharp shape is rolled, and the likelihood of the work roll being damaged is high.
  • This first pass is essentially the same as for tandem rolling and is halted when the leading end of the threaded strip and the following end of the coil to be rolled come to the input side of No. 1 mill so as to prevent the end of the coil from damaging the roll. Reverse rolling is then starts and tail extraction is carried out in the same way as for usual tandem arrangements.
  • Production also approximately doubles as a product can be produced using half the number of passes.
  • the material coil uncoiling side and the coil winding side are taken to be the same side so that the coil extracting operation and the strip passing coiling on of the next coil do not interfere with each other, with an arrangement where the unwound coil can be immediately wound on for strip passing being preferable.
  • a rolling mill, rolling method and rolling installation that are easily maintained and of superior rolling efficiency where the distance between two sets of roll groups is shortened and strip walking and strip bending of rolling material is prevented.

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

Claims (22)

  1. Walzwerk mit einem Quarto-Walzgerüst, das mit Walzengruppen ausgestattet ist, die aus oberen und unteren Arbeitswalzen (3, 3') über und unter einem Walzgut (22) und oberen und unteren Stützwalzen (2, 2'), die die oberen bzw. unteren Arbeitswalzen abstützen, bestehen, wobei zwei dieser Walzengruppen in einem einzigen Walzengehäuse (1) aufgenommen sind und ein Antrieb auf einer Seite in einer axialen Richtung der Walzengruppen erfolgt und ein Betrieb auf der verbleibenden Seite erfolgt, dadurch gekennzeichnet, dass die Metalleinbaustücke (4, 4') der Arbeitswalzen (3, 3') als ein Einzelkörper zwei Arbeitswalzen (3, 3; 3', 3') abstützen auf unteren und oberen Seiten und auf separaten Antriebs- und Betriebsseiten.
  2. Walzwerk mit einem Sexto-Walzgerüst, das mit Walzengruppen ausgestattet ist, die aus oberen und unteren Arbeitswalzen (3, 3') über und unter einem Walzgut (22), oberen und unteren Zwischenwalzen (19, 19'), die die oberen bzw. unteren Arbeitswalzen abstützen, und oberen und unteren Stützwalzen (2, 2'), die die oberen bzw. unteren Zwischenwalzen abstützen, bestehen, wobei zwei dieser Walzengruppen in einem einzigen Walzengehäuse (1) aufgenommen sind und ein Antrieb auf einer Seite in einer Axialrichtung der Walzengruppen und ein Betrieb auf der verbleibenden Seite erfolgt, dadurch gekennzeichnet, dass zumindest die Metalleinbaustücke (4, 4') der Arbeitswalzen (3, 3') als ein Einzelkörper zwei Arbeitswalzen (3, 3; 3', 3') abstützen auf unteren und oberen Seiten und auf separaten Antriebs- und Betriebsseiten.
  3. Walzwerk nach Anspruch 1 oder Anspruch 2, bei dem Bandzufuhrführungen zum Zuführen der Bänder des Walzguts zwischen den zwei Gruppen von Walzen an den Metalleinbaustücken (4, 4') der Arbeitswalzen (3, 3') befestigt sind.
  4. Walzwerk nach einem der Ansprüche 1 bis 3, bei dem ein Spannungsmesser (6) zur Erfassung der Spannung des Walzguts (22) an mindestens einem der Metalleinbaustücke (4') für die oberen und unteren Arbeitswalzen (3, 3') vorhanden ist.
  5. Walzwerk nach einem der Ansprüche 1 bis 4, bei dem zylindrische Stützen (13, 13') an Gleitelementen der Metalleinbaustücke (4, 4') der Arbeitswalzen (3, 3') und des Gehäuses (1) derart vorgesehen sind, dass Gleitoberflächen der Metalleinbaustücke der Arbeitswalzen und des Gehäuses bezüglich einer Neigung der Metalleinbaustücke einen Oberflächenkontakt beibehalten.
  6. Walzwerk nach Anspruch 1, bei dem beim Walzen des Walzguts (22) die zwei oberen Arbeitswalzen (3, 3) und die zwei unteren Arbeitswalzen (3', 3') der zwei Sätze von Walzengruppen in entgegengesetzten Richtungen in einer horizontalen Ebene geneigt sind, die einen Schnittpunkt einer Pfadmittellinie am Mittelpunkt einer Breitenrichtung des Walzguts und einer Mittellinie für die axiale Richtung beider Walzengruppen als Mittelpunkt einnimmt.
  7. Walzwerk nach Anspruch 1, bei dem beim Walzen des Walzguts (22) die zwei oberen Arbeitswalzen (3, 3), die zwei oberen Stützwalzen (2, 2), die zwei unteren Arbeitswalzen (3', 3') und die zwei unteren Stützwalzen (2,', 2') der zwei Sätze von Walzengruppen in entgegengesetzten Richtungen nach oben und unten in einer horizontalen Ebene geneigt sind, die einen Schnittpunkt einer Pfadmittellinie am Mittelpunkt einer Breitenrichtung des Walzguts und einer Mittellinie für die axiale Richtung beider Walzengruppen als Mittelpunkt einnimmt.
  8. Walzwerk nach Anspruch 6 oder Anspruch 7, bei dem kugelförmige Stützen (13, 13') in einer derartigen Art und Weise an Gleitelementen der Metalleinbaustücke (4, 4') der Arbeitswalzen und des Walzengehäuses (1) bereitgestellt sind, dass Gleitoberflächen der Metalleinbaustücke der Arbeitswalzen und des Walzengehäuses bezüglich einer Neigung in der horizontalen und vertikalen Richtung der Metalleinbaustücke einen Oberflächenkontakt beibehalten.
  9. Walzwerk nach Anspruch 1, bei dem die zwei oberen Arbeitswalzen (3, 3) und die zwei unteren Arbeitswalzen (3', 3') und die zwei unteren Stützwalzen (2,', 2') der zwei Sätze von Walzengruppen in axialen Richtungen in entgegengesetzten Richtungen verschoben werden.
  10. Walzwerk nach Anspruch 2, bei dem Metalleinbaustücke (26, 26') für die Zwischenwalzen (19, 19') zwei Zwischenwalzen (19, 19; 19', 19') als einzelne Stücke getrennt an den oberen und unteren Seiten und an den Antriebs- und Betriebsseiten abstützen.
  11. Walzwerk nach Anspruch 10, bei dem die zwei oberen Zwischenwalzen (19, 19) und die zwei unteren Zwischenwalzen (19', 19') über die Metalleinbaustücke (26, 26') der Zwischenwalzen axial in entgegengesetzte Richtungen verschoben werden.
  12. Walzwerk nach Anspruch 11, bei dem die zwei oberen Arbeitswalzen (3, 3) und die zwei unteren Arbeitswalzen (3', 3') über die Metalleinbaustücke (4, 4') der Arbeitswalzen im wesentlichen gleichzeitig zu der axialen Bewegung der zwei oberen Zwischenwalzen (19, 19) und der zwei unteren Zwischenwalzen (19', 19') axial in entgegengesetzte Richtungen verschoben werden.
  13. Walzwerk nach einem der vorhergehenden Ansprüche, bei dem ein Schub in der axialen Richtung der Stützwalzen von einer Schublagereinrichtung (10, 10') auf der Mittellinie der Walzenachse aufgenommen wird.
  14. Walzwerk nach einem der vorhergehenden Ansprüche, bei dem ein Walzwerksantrieb, der die Zwischenwalzen oder die Stützwalzen antreibt, Mittel zum Einstellen von Walzeneinrichtern (11, 11') der Arbeitswalzen auf einen größeren als einen vorbestimmten Sollwert zum Zeitpunkt des Abschneiden des Bandes von dem Walzgut.
  15. Walzwerk nach einem der vorhergehenden Ansprüche, bei dem ein Mittel (12, 12'; 17, 17') zum Pressen unter Verwendung von Hydraulik in einer derart vorgesehen ist, dass ein Abstand zwischen der Gleitoberfläche des Metalleinbaustücks und der Gleitoberfläche des Gehäuses zumindest an dem Gleitelement des Metalleinbaustückes (4, 4') für die Arbeitswalze (3, 3') gering wird.
  16. Verwendung eines Walzwerks nach Anspruch 1 oder 2 zum Durchführen des Walzens.
  17. Walzverfahren nach Anspruch 16, bei dem die Arbeitswalzeneinrichter auf einen Wert eingestellt werden, der gleich einem vorbestimmten Sollwert oder größer ist als ein vorbestimmter Sollwert zum Zeitpunkt, an dem das Abschneiden des Bandes von dem Walzgut erfolgt.
  18. Walzverfahren nach Anspruch 16 oder 17, bei dem ein Walzwerk oder mehrere Walzwerke in einer Walzrichtung angeordnet ist/sind und das Walzen in einer Richtung durchgeführt wird.
  19. Walzverfahren nach Anspruch 16 oder 17, bei dem ein Umkehrwalzen durchgeführt wird.
  20. Walzverfahren nach einem der Ansprüche 16 bis 19, bei dem die Arbeitswalzen oder die Zwischenwalzen abwechselnd, jeweils nur eine Walze gleichzeitig, durch eine Schleifmaschine geschliffen werden, während sie an den Metalleinbaustücken befestigt bleiben und das Walzen ausführen.
  21. Warmwalzanlage, die mit einem Vorwalzwerk und einem Fertigwalzwerk ausgestattet ist, wobei die Warmwalzanlage heißes Material in dem Fertigwalzwerk walzt oder Flachgut mittels einer Gießeinrichtung für dünnes Flachgut gegossen ist, so wie es ist in einem Fertigwalzwerk walzt, wobei das Fertigwalzwerk ein Walzwerk nach Anspruch 1 oder 2 umfasst.
  22. Warmwalzanlage nach Anspruch 21, bei der zwei der Fertigwalzwerke (66) hintereinander angeordnet sind.
EP96908338A 1996-04-03 1996-04-03 Walzwerk, walzverfahren und walzanlage Expired - Lifetime EP0896840B1 (de)

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PCT/JP1996/000918 WO1997036700A1 (fr) 1996-04-03 1996-04-03 Laminoir, et procede et equipement de laminage

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JP4135351B2 (ja) * 2001-10-12 2008-08-20 株式会社日立製作所 多列圧延機及びその使用方法並びに圧延設備
DE10349950A1 (de) * 2003-10-24 2005-05-25 Sms Demag Ag Walzwerk zum Warmwalzen von Metall, insbesondere von Aluminium, sowie Warmwalzverfahren
CH697624B1 (de) * 2005-02-23 2008-12-31 Main Man Inspiration Ag Walzeinrichtung für ein Inline-Walzen eines durch Bandgiessen, insbesondere Zweirollen-Bandgiessen hergestelltes Stahlband.
DE102008003222A1 (de) * 2007-09-13 2009-03-19 Sms Demag Ag Kompakte flexible CSP-Anlage für Endlos-, Semi-Endlos- und Batchbetrieb
KR100957923B1 (ko) 2008-06-19 2010-05-13 주식회사 포스코 압연공정에서의 압연하중 변동에 의한 강판 크라운량 변동방지방법
WO2013042204A1 (ja) * 2011-09-20 2013-03-28 三菱日立製鉄機械株式会社 冷間圧延機、タンデム圧延設備、可逆圧延設備、圧延設備の改造方法および冷間圧延機の運転方法
CN102652958A (zh) * 2012-05-04 2012-09-05 中国重型机械研究院有限公司 一种双六辊平整机
CN102814328B (zh) * 2012-05-04 2014-08-06 中国重型机械研究院有限公司 一种四六辊平整机
CN109530433B (zh) * 2018-12-11 2023-12-08 佛山市诚德新材料有限公司 一种不锈钢带的冷轧系统
CN111014299B (zh) * 2019-11-12 2022-08-09 上海宝钢工业技术服务有限公司 热轧卷取机助卷辊框架轴承座在线安装方法
CN117983658B (zh) * 2024-02-29 2024-08-23 山东德利铝业科技有限公司 铝箔毛料板形冷轧装置

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IT1138380B (it) * 1981-05-21 1986-09-17 Innocenti Santeustacchio Spa Laminatoio reversibile di limitata potenzialita'particolarmente per la laminazione a caldo di acciai speciali e di metalli non ferrosi
JP2999619B2 (ja) * 1991-12-27 2000-01-17 株式会社日立製作所 金属板熱間圧延設備
JP3174457B2 (ja) * 1994-05-17 2001-06-11 株式会社日立製作所 連鋳直結熱間圧延設備およびその圧延方法

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EP0896840A4 (de) 2001-04-04
KR100307121B1 (ko) 2001-11-09
KR20000005248A (ko) 2000-01-25
DE69623343T2 (de) 2003-04-24
DE69623343D1 (de) 2002-10-02
WO1997036700A1 (fr) 1997-10-09
EP0896840A1 (de) 1999-02-17

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