EP2656933A1 - Laminoir doté dýune fonction de commutation de cylindre de travail - Google Patents

Laminoir doté dýune fonction de commutation de cylindre de travail Download PDF

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Publication number
EP2656933A1
EP2656933A1 EP13002093.6A EP13002093A EP2656933A1 EP 2656933 A1 EP2656933 A1 EP 2656933A1 EP 13002093 A EP13002093 A EP 13002093A EP 2656933 A1 EP2656933 A1 EP 2656933A1
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EP
European Patent Office
Prior art keywords
strip
pair
rolls
rolling mill
roll
Prior art date
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Granted
Application number
EP13002093.6A
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German (de)
English (en)
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EP2656933B1 (fr
Inventor
Takashi Norikura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Japan Ltd
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Mitsubishi Hitachi Metals Machinery Inc
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Application filed by Mitsubishi Hitachi Metals Machinery Inc filed Critical Mitsubishi Hitachi Metals Machinery Inc
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Classifications

    • 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
    • B21B13/142—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 by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • 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
    • B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/02—Profile, e.g. of plate, hot strip, sections
    • 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
    • B21B2269/14—Work rolls
    • 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
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Definitions

  • the present invention relates to a rolling mill for performing rolling of a electrical steel strip, a high-tensile steel strip, a mild steel strip, or the like, the rolling mill equipped with a work roll shift function to shift work rolls tapered at one ends in roll axial directions, thereby controlling edge drop of a material to be rolled, or controlling a strip shape.
  • the taper shoulder positions of the tapered portions of the work rolls cannot be caused to coincide with the vicinities of the insides of correct strip widthwise ends or the vicinities of the outsides of correct strip widthwise ends,.
  • the work rolls are set with a deviation corresponding to the amount of strip meandering, leading to a problem that such improvement of yield due to reduction in edge drop or improvement of production efficiency due to realization of stable rolling as described above cannot sufficiently be achieved.
  • Patent Literature 2 discloses a technique to obtain a positional difference between an actual position of the material to be rolled and a proper position thereof relative to the rolling mill on the basis of detection results of a strip end detector and a shift amount detector for a roll shift device, and adjust the respective sizes of right and left gaps of the work rolls according to the positional difference, thereby correcting a widthwise position of the material to be rolled, that is, correcting meandering of the strip.
  • an object of the present invention is to provide a rolling mill equipped with a work roll shift function that can improve yield and realize stable rolling with a simple means, and that can roll even a meandering metal strip into an operation side-drive side symmetrical shape.
  • a rolling mill equipped with a work roll shift function for solving the above problems is a rolling mill equipped with a work roll shift function, being a six-high rolling mill including a pair of upper and lower work rolls for rolling a metal strip, a pair of upper and lower intermediate rolls supporting the work rolls, and a pair of upper and lower back-up rolls supporting the intermediate rolls, or being a four-high rolling mill including a pair of upper and lower work rolls for rolling a metal strip and a pair of upper and lower back-up rolls supporting the work rolls, characterized in that:
  • the rolling mill equipped with a work roll shift function is characterized in that the pair of upper and lower intermediate rolls of the six-high rolling mill are provided with tapered portions in upper and lower positions in point symmetry, and intermediate roll shift devices are also provided for shifting the pair of upper and lower intermediate rolls in roll axial directions; and the control means performs shift control of the intermediate roll shift devices respectively for the upper side and the lower side so as to cause taper start positions of the tapered portions of the pair of upper and lower intermediate rolls to coincide with the vicinities of the outsides of the operation-side and drive side strip widthwise ends detected by the strip widthwise end position detector.
  • the rolling mill equipped with a work roll shift function is characterized in that the pair of upper and lower intermediate rolls of the six-high rolling mill are also provided with tapered portions in upper and lower positions in point symmetry, and intermediate roll shift devices are provided for shifting the pair of upper and lower intermediate rolls in roll axial directions, and shift control of the intermediate roll shift devices is performed so as to perform operation side-drive side asymmetrical shift control of the pair of upper and lower intermediate rolls to correct asymmetry of a strip shape.
  • a rolling mill equipped with a work roll shift function is a rolling mill including a pair of upper and lower work rolls for rolling a metal strip, a pair of upper and lower intermediate rolls supporting the work rolls, and a pair of upper and lower back-up rolls supporting the intermediate rolls, characterized in that:
  • the rolling mill equipped with a work roll shift function is characterized in that the work rolls of the four-high rolling mill are provided with independent roll bending devices on the operation side and on the drive side, and roll bending forces on the operation side and on the drive side are changed so as to correct asymmetry of a strip shape.
  • the rolling mill equipped with a work roll shift function is characterized in that the work rolls and/or the intermediate rolls of the six-high rolling mill are provided with independent roll bending devices on the operation side and on the drive side, and roll bending forces on the operation side and on the drive side are changed so as to correct asymmetry of a strip shape.
  • the strip widthwise end position detector is provided for detecting actual strip widthwise end positions, and the taper start positions of the pair of upper and lower work rolls are caused to coincide with the vicinities of the insides of the actual strip widthwise ends detected by the strip widthwise end position detector independently for the upper side and the lower side. Therefore, the amount of edge drop, which is a reduction in the strip thicknesses of the strip widthwise ends, can be more effectively reduced. As a result, the amount of edge trimming in the following process is reduced, and the yield is improved.
  • the taper start positions of the pair of upper and lower work rolls are caused to coincide with the vicinities of the outsides of the actual strip widthwise ends detected by the strip widthwise end position detector. Therefore, harmful contact line pressure from the outside of the strip width to the work rolls from the support rolls is reduced, so that shape stability (small shape variation relative to load variation) is significantly improved, and stable rolling becomes possible.
  • this meandering of the metal strip causes the shape of the metal strip to be asymmetrical on the operation side and on the drive side.
  • the taper start positions of the pair of upper and lower intermediate rolls are caused to coincide with the vicinities of the outsides of the strip widthwise ends
  • the taper start positions of the pair of upper and lower work rolls are caused to coincide with the vicinities of the insides of the strip widthwise ends respectively for the upper side and the lower side, such that the thicknesses of the strip widthwise ends on an operation side and on a drive side measured by the strip widthwise end thickness meter become predetermined thicknesses. Therefore, the metal strip can be rolled to have an operation side-drive side symmetrical shape, so that stable rolling can be realized.
  • Fig. 1 is a front view of a six-high rolling mill according to a first example of the present invention
  • Fig. 2 is an arrow sectional view taken along the line II-II of Fig. 1
  • Fig. 3 is an arrow sectional view taken along the line III-III of Fig. 2
  • Fig. 4 is a descriptive view of taper start positions of tapered portions of work rolls and intermediate rolls
  • Figs. 5A and 5B are graphs of results of comparison of strip shape variation relative to load variation
  • Fig. 5A being a graph showing a result of calculation of strip shape variation relative to load variation in a conventional technique
  • Fig. 5B being a graph showing a result of calculation of strip shape variation relative to load variation in the present invention.
  • the rolling mill of the first example is a six-high rolling mill as shown in Figs. 1 to 4 , and a metal strip (hereinafter simply called strip) 1, which is a material to be rolled, is rolled by a pair of upper and lower work rolls 2.
  • This pair of upper and lower work rolls 2 are supported in contact with a pair of upper and lower intermediate rolls 3, respectively, and this pair of upper and lower intermediate rolls 3 are supported in contact with a pair of upper and lower back-up rolls 4, respectively.
  • the upper back-up roll 4 is supported by bearing boxes 10a and 10c via unillustrated bearings. These bearing boxes 10a and 10c are supported by housings 7a and 7b via pass line adjusters 5a and 5b, such as a worm jack or a taper wedge and a stepped rocker plate. Here, the pass line adjusters 5a and 5b may incorporate load cells to measure rolling loads.
  • the lower back-up roll 4 is supported by bearing boxes 10b and 10d via unillustrated bearings. These bearing boxes 10b and 10d are supported by the housings 7a and 7b via hydraulic cylinders 6a and 6b.
  • the pair of upper and lower work rolls 2 have tapered portions (portions reduced in diameter) 2b in upper and lower positions in point symmetry about the strip widthwise center of the strip 1, respectively, and Reference Sign 2a in the drawings denotes a taper start position of the tapered portion.
  • bearing boxes 8a to 8d are attached to roll neck portions of the pair of upper and lower work rolls 2 via unillustrated bearings.
  • the pair of upper and lower work rolls 2 can be moved (shifted) in roll axial directions by a pair of right and left shift cylinders (work roll shift devices) 13 via the drive side bearing boxes 8c and 8d, detachable hooks 12, and shift frames 11. Further, these bearing boxes 8a to 8d are provided with bending cylinders (roll bending devices) 31a to 31d for applying roll bending. Rolling bending is thus applied to the work rolls 2 by the bending cylinders 31 a to 31 d.
  • rolling loads are applied by the hydraulic cylinders 6a and 6b described above, and rolling torques are transmitted to the pair of upper and lower work rolls 2 directly by unillustrated spindles, or transmitted to the work rolls 2 indirectly via the intermediate rolls 3 by the spindles.
  • the pair of upper and lower intermediate rolls 3 have tapered portions (portions reduced in diameter) 3b in upper and lower positions in point symmetry about the center of strip width of the strip 1, respectively, and Reference Sign 3a in the drawings denotes a taper start position of the tapered portion.
  • bearing boxes 9a to 9d are attached to roll neck portions of the pair of upper and lower intermediate rolls 3 via unillustrated bearings.
  • the pair of upper and lower intermediate rolls 3 can be moved (shifted) in roll axial directions by a pair of right and left shift cylinders (intermediate roll shift devices) 34 via the drive side bearing boxes 9c and 9d, unillustrated attachable and detachable hooks, and unillustrated shift frames.
  • these bearing boxes 9a to 9d are provided with bending cylinders (roll bending devices) 30a to 30d applying roll bending. Rolling bending is thus applied to the intermediate rolls 3.
  • a strip widthwise end position detector 32 is provided on an entry side or on a delivery side (entry side in the example shown in the drawings) of the rolling mill to detect actual strip widthwise end positions of the strip 1.
  • a detection signal of the strip widthwise end position detector 32 is inputted to a controller (control means) 35. Based on the detection signal, the controller 35 performs shift control of the pairs of right and left shift cylinders 13 and 34, thereby adjusting shift directions and shift amounts of the work rolls 2 and the intermediate rolls 3.
  • the actual strip widthwise end positions are detected by the strip widthwise end position detector 32.
  • the taper start positions 2a which are arranged in upper and lower positions in point symmetry, of the pair of upper and lower work rolls 2 are shifted independently for the upper side and the lower side so as to coincide with the vicinities of the insides of the actual strip widthwise ends detected by the strip widthwise end position detector 32.
  • strip widthwise ends 1a to be thicker by clearances (see ⁇ W and ⁇ d in Fig. 4 ) of the taper start positions 2a than a strip central portion. Consequently, a reduction in the strip thicknesses of the strip widthwise ends 1a after rolling (edge drop) is also suppressed, the amount of edge trimming in the following process is reduced, and the yield is improved accordingly.
  • the first example an example of applying roll bending to the pair of upper and lower intermediate rolls 3 has been shown, and the first example provides excellent strip shape controllability in combination with the shift function of the pair of upper and lower intermediate rolls 3 described above. It should be noted that rolling bending may not necessarily be applied to the intermediate rolls 3. In this case, the shape controllability decreases but the structure becomes simple.
  • a roll mark is prevented from being transferred to the strip 1 (due to deviations of the taper start positions 3a to the insides of actual strip widthwise ends) or edge waves are prevented from occurring (due to deviations of the taper start positions 3a to the outsides of actual strip widthwise ends).
  • Fig. 5A shows a case where conventional straight work rolls 200, which do not have taper shoulders, are used and taper start positions of intermediate rolls 300 are shifted so as to coincide with the vicinities of the outsides of strip widthwise ends.
  • a load changes by 1.2 times from 1041 tons to 1245 tons
  • the shape changes by 23 I-units (steel strip widthwise positions and a difference in elongation percentage when a steel strip is rolled).
  • Fig. 5A shows a case where conventional straight work rolls 200, which do not have taper shoulders, are used and taper start positions of intermediate rolls 300 are shifted so as to coincide with the vicinities of the outsides of strip widthwise ends.
  • I-units steel strip widthwise positions and a difference in elongation percentage when a steel strip is rolled.
  • 5B shows a case where the taper start positions of the work rolls 2 are shifted so as to coincide with the vicinities of the outsides of strip widthwise ends, and further, the taper start positions of the intermediate rolls 3 are shifted so as to coincide with the vicinities of the outsides of strip widthwise ends.
  • the taper start positions of the work rolls 2 are shifted so as to coincide with the vicinities of the outsides of strip widthwise ends
  • the taper start positions of the intermediate rolls 3 are shifted so as to coincide with the vicinities of the outsides of strip widthwise ends.
  • Fig. 6 is a descriptive view of strip meandering according to a second example of the present invention
  • Figs. 7A and 7B are descriptive views showing the necessity of an asymmetrical shape control means in case of strip meandering according to the second example
  • Fig. 7A being a descriptive view of a material linear pressure distribution
  • Fig. 7B being a descriptive view of a strip shape
  • Fig. 8 is a descriptive view showing an example of application of the second example to a tandem rolling mill.
  • the taper start positions 2a are shifted by an amount corresponding to the meandering accordingly. This makes it possible to set the taper start positions 2a in the vicinities of the insides of the strip widthwise ends or the vicinities of the outsides of the strip widthwise ends of actual strip widthwise ends.
  • the linear pressure distribution in material of the work rolls 2 and the strip 1 is such that, as shown by the vertical straight arrows in Figure 7A , the linear pressure is low on the drive side and high on the operation side.
  • the shape of the strip 1 takes a strip shape where edge waves T occur on the operation side, as shown in Figure 7B .
  • shift control of the shift cylinders 34 is performed and upper-lower asymmetrical shifting of the pair of upper and lower intermediate rolls 3 is performed by the controller 35 described in the first example.
  • the taper start position 3a of the upper intermediate roll 3 is shifted toward the drive side
  • the taper start position 3a of the lower intermediate roll 3 is also shifted toward the drive side (see the horizontal straight arrows in Fig. 7A ).
  • the rolling mill of the second example be installed in at least one stand of a tandem rolling mill including, for example, No. 1 to No. 5 stands (for example, in the No. 5 stand in the example shown in Fig. 8 ) and the strip widthwise end position detector 32 be installed on the entry side (or the delivery side) of this at least one stand (the No. 5 stand in the example shown in Fig. 8 ).
  • the amount of edge drop can be reduced with the inexpensive strip widthwise end position detector 32.
  • Fig. 9 is a front view of a six-high rolling mill according to a third example of the present invention
  • Fig. 10 is a descriptive view showing an example of application of the third example to a tandem rolling mill.
  • the third example is such that in case of meandering of the strip 1 during rolling, actual strip widthwise end positions are detected by the strip widthwise end position detector 32 installed on the entry side (or the delivery side) of the rolling mill, the taper start positions 3a, which are arranged in upper and lower positions in point symmetry, of the pair of upper and lower intermediate rolls 3 are shifted independently for the upper side and the lower side so as to coincide with the vicinities of the outsides of the actual strip widthwise ends detected by the strip widthwise end position detector 32, and a strip widthwise end thickness meter 33 is installed on the delivery side of the rolling mill, and the taper start positions 2a, which are arranged in upper and lower positions in point symmetry, of the pair of upper and lower work rolls 2 are shifted respectively for the upper side and the lower side to the vicinities of the insides of the strip widthwise ends so that the thicknesses of the strip widthwise ends measured on the operation side and on the drive side become predetermined thicknesses (reduction in amount of edge drop).
  • a method of reducing edge drop by shift of the work rolls 2 having the taper start positions 2a will be described below.
  • the work rolls 2 are provided with the taper start positions 2a in upper and lower positions in point symmetry, and distances between the taper start positions 2a and the strip widthwise ends are represented as ⁇ w and ⁇ d (see Fig. 4 ).
  • a strip widthwise end thickness meter 36 measures a strip thickness or strip thicknesses at a single point or a plurality of points in the vicinities of the strip widthwise ends, on the operation side and on the drive side, on the delivery side of the rolling mill.
  • the upper work roll 2 is shifted in a roll axial narrowing direction. In other words, the upper work roll 2 is shifted in a direction in which the distance ⁇ w increases.
  • the upper work roll 2 is shifted in a roll axial widening direction. In other words, the upper work roll 2 is shifted in a direction in which the distance ⁇ w decreases.
  • the lower work roll 2 is similarly shifted so that the predetermined strip thickness can be obtained.
  • shift control of the shift cylinders 34 may be performed by the controller 35 described in the first example to perform upper-lower asymmetrical shifting of the pair of upper and lower intermediate rolls 3 so that improvement of shape stability can be achieved.
  • the rolling mill of the third example be installed in at least one stand of a tandem rolling mill including, for example, No. 1 to No. 5 stands (for example, in the No. 5 stand in the example shown in Fig. 10 ) and the strip widthwise end position detector 32 be installed on the entry side (or the delivery side) of this at least one stand (the No. 5 stand in the example shown in Fig. 10 ), while the strip widthwise end thickness meter 33 be installed on the delivery side (or the entry side).
  • the amount of edge drop can be reduced.
  • Fig. 11 is a front view of a four-high rolling mill according to a fourth example of the present invention
  • Fig. 12 is an arrow sectional view taken along the XII-XII of Fig. 11 .
  • a rolling mill of the fourth example is a four-high rolling mill, and has a configuration obtained by removing the pair of upper and lower intermediate rolls 3 and the set of bearing boxes 9a to 9d from the six-high rolling mills of the first to third examples.
  • the strip widthwise end position detector 32 is installed on the delivery side of the rolling mill. In this case, though the absence of the shift function of the intermediate rolls 3 causes a significant decrease in strip shape controllability, there is the advantage that the structure is simpler than those of the first to third examples.
  • the present invention shifts work rolls having tapered shoulders to the vicinities of the insides of actual strip widthwise ends or the vicinities of the outsides of actual strip widthwise ends detected by a strip widthwise end position detector, and is applicable to a rolling mill having excellent edge drop reduction and shape stability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP13002093.6A 2012-04-25 2013-04-22 Laminoir doté d'une fonction de commutation de cylindre de travail Active EP2656933B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012099722A JP5905322B2 (ja) 2012-04-25 2012-04-25 作業ロールシフト機能を具備した圧延機

Publications (2)

Publication Number Publication Date
EP2656933A1 true EP2656933A1 (fr) 2013-10-30
EP2656933B1 EP2656933B1 (fr) 2016-02-10

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EP13002093.6A Active EP2656933B1 (fr) 2012-04-25 2013-04-22 Laminoir doté d'une fonction de commutation de cylindre de travail

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EP (1) EP2656933B1 (fr)
JP (1) JP5905322B2 (fr)
CN (1) CN103372566B (fr)
IN (1) IN2013MU01488A (fr)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN106552826A (zh) * 2015-09-30 2017-04-05 上海梅山钢铁股份有限公司 热连轧精轧机组窜辊控制方法
CN114728315A (zh) * 2020-01-29 2022-07-08 普锐特冶金技术日本有限公司 轧制机以及金属板的轧制方法
CN114728316A (zh) * 2020-01-22 2022-07-08 日本森吉米尔公司 多辊轧机

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105598182A (zh) * 2016-01-19 2016-05-25 北京首钢股份有限公司 一种变行程变步长窜辊方法
CN107262528B (zh) * 2017-07-06 2018-11-09 一重集团大连工程技术有限公司 一种液压缸外置式工作辊横移装置及其装配方法

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Publication number Priority date Publication date Assignee Title
CN106552826A (zh) * 2015-09-30 2017-04-05 上海梅山钢铁股份有限公司 热连轧精轧机组窜辊控制方法
CN114728316A (zh) * 2020-01-22 2022-07-08 日本森吉米尔公司 多辊轧机
CN114728315A (zh) * 2020-01-29 2022-07-08 普锐特冶金技术日本有限公司 轧制机以及金属板的轧制方法
EP4074430A4 (fr) * 2020-01-29 2023-01-04 Primetals Technologies Japan, Ltd. Machine et procédé de laminage pour laminer des tôles métalliques
US12103060B2 (en) 2020-01-29 2024-10-01 Primetals Technologies Japan, Ltd. Rolling mill and rolling method for metal plate

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JP2013226573A (ja) 2013-11-07
CN103372566B (zh) 2015-07-08
CN103372566A (zh) 2013-10-30
IN2013MU01488A (fr) 2015-04-17
EP2656933B1 (fr) 2016-02-10
JP5905322B2 (ja) 2016-04-20

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