US20200338608A1 - Rolling method of shaped steel, production line of shaped steel, and production method of shaped steel - Google Patents

Rolling method of shaped steel, production line of shaped steel, and production method of shaped steel Download PDF

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US20200338608A1
US20200338608A1 US16/771,941 US201816771941A US2020338608A1 US 20200338608 A1 US20200338608 A1 US 20200338608A1 US 201816771941 A US201816771941 A US 201816771941A US 2020338608 A1 US2020338608 A1 US 2020338608A1
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Prior art keywords
rolling
rolling mill
torque
train
mills
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US16/771,941
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English (en)
Inventor
Kazunori Seki
Hiroyuki Ishibashi
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Nippon Steel Corp
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Nippon Steel Corp
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Assigned to NIPPON STEEL CORPORATION reassignment NIPPON STEEL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHIBASHI, HIROYUKI, SEKI, KAZUNORI
Publication of US20200338608A1 publication Critical patent/US20200338608A1/en
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    • 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
    • B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/088—H- or I-sections
    • 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
    • B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/12—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 structural sections, i.e. work of special cross-section, e.g. angle steel in a continuous process, i.e. without reversing stands
    • 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
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/10—Endless rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/06—Interstand tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current
    • B21B2275/12—Roll torque
    • 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
    • B21B37/46—Roll speed or drive motor control

Definitions

  • the present invention relates to a rolling method of shaped steel which produces the shaped steel such as, for example, H-shaped steel, T-shaped steel, and I-shaped steel, a production line of the shaped steel, and a production method of the shaped steel.
  • Patent Document 1 discloses a technique of carrying out tension control between respective stands of a continuous rolling mill. Concretely, the control is performed by relating a relationship among a rolling torque, a rolling load, forward tension, and backward tension of respective rolling stands by a linear equation, estimating the forward tension and the backward tension based on measurement values of the rolling torque and the rolling load, and setting the estimated values as target values in Patent Document 1.
  • Patent Document 2 discloses a technique of performing speed control by storing current of a roll driving motor when a material to be rolled is bitten into a reference rolling mill to compare with current of the roll driving motor when the material to be rolled is bitten into a next rolling mill in a continuous rolling mill having two or more rolling mills.
  • Patent Document 3 discloses a technique of performing control of tension between respective stands by detecting only a torque fluctuation due to forward tension between a plurality of stands of a tandem rolling mill.
  • Patent Document 3 discloses a constitution where a no-tension torque of each arbitrary stand is found based on a rolling torque under a state where a material to be rolled is not bitten into a downstream side stand and a rolling torque of an upstream side stand at that timing at an arbitrary stand.
  • Patent Document 1 Japanese Laid-open Patent Publication No. 2008-183594
  • Patent Document 2 Japanese Patent Publication No. S53-34586
  • Patent Document 3 Japanese Patent Publication No. S61-3564
  • Patent Document 2 assumes that the tension between the reference rolling mill and a subsequent rolling mill can be controlled into a no-tension state before the material to be rolled is bitten into the subsequent stand (next rolling mill), and there is a possibility that the technique is not applicable when a distance between the stands becomes short.
  • Patent Document 3 assumes that a total sum of the rolling torques is constant regardless of tension, and when there is an error in this assumption, the error affects on the tension control between stands resulting in that the tension control with high accuracy is impossible. Further, the technique of Patent Document 3 is invented basically on an assumption of rolling of wire materials or steel sheets, and some error may occur when it is applied to shaped steel which is rolled by using a universal rolling mill. Hereinafter, reasons thereof will be shortly explained in [0011] to [0016].
  • G 1 G 10 ⁇ A 12 ⁇ T 12 (B1)
  • G 2 G 20+ B 12 ⁇ T 12 ⁇ A 23 ⁇ T 23 (B2)
  • G 3 G 30+ B 23 ⁇ T 23 (B3)
  • Expression (A1) and Expression (B4) which are the expressions to derive a second stand rolling torque G20 when the second stand is in no-tension are described together, further Expression (B4) is modified into Expression (B4)′ to be compared.
  • G ⁇ ⁇ 20 G ⁇ ⁇ 2 * + G ⁇ ⁇ 1 * - G ⁇ ⁇ 10 ( A ⁇ ⁇ 1 )
  • the second stand rolling torque G20 in no-tension is excessively figured out when A12>B12, and the second stand rolling torque G20 in no-tension is figured out too small when A12 ⁇ B12 because the tension is set to be applied (that is, T12>0) to prevent poor material passage at a biting time.
  • FIG. 9 is a schematic explanatory diagram of a universal intermediate rolling of the H-shaped steel, where (a) was a front view, and (b) is a plan view of two stands.
  • Rolling conditions were set as web thickness t of 11.4 mm ⁇ 10.0 mm ⁇ 9.0 mm, and a flange thickness tf of 17.2 mm ⁇ 14.8 mm ⁇ 13 mm
  • FIG. 10 is a graphic chart representing torque change amounts (ton ⁇ m) of respective stands through numerical analysis when tension (tonf) between a first stand R1 and a second stand R2 changes under the rolling conditions as stated above.
  • the influence coefficients A12 and B12 are the same, it is considered that positive and negative of the torque change amounts of the respective stands are reversed, and inclinations are the same.
  • the inclinations are different in the torque change amount of the first stand R1 and the torque change amount of the second stand R2, and it can be seen that A12>B12. That is, the second stand rolling torque G20 in no-tension is figured out to be too small when the tension control based on Patent Document 3 is performed under the rolling conditions of the shaped steel as stated above.
  • the tension control does not make it in time before the material to be rolled is bitten into the downstream stand when the distance between stands is 1.5 m or less under conditions where recovery from lowering of the peripheral velocity just after the biting into each rolling stand (what is called an impact drop) is approximately 0.5 seconds and a biting speed of each rolling stand is 3 m/s.
  • an object of the present invention is to provide a rolling method of shaped steel capable of controlling tension between stands with high accuracy by using a simple control system without using table values or the like by each rolling condition even under a condition that a distance between stands is short when rolling of the shaped steel is carried out by using a continuous rolling mill formed of three pieces or more of rolling mills in a tandem state, and improving stability of material passage and accuracy of product dimension, a production line of the shaped steel, and a production method of the shaped steel.
  • a rolling method of shaped steel which carries out reduction between a horizontal roll side surface and a vertical roll peripheral surface by using one piece or more of rolling mill when tandem rolling is carried out in a rolling mill train formed of n-pieces of rolling mills of at least three pieces or more, the rolling method including: a first control step of fixing the peripheral velocity of a rolling mill Ri of the rolling mill train after a material to be rolled is bitten into the rolling mill Ri and before the material to be rolled is bitten into a rolling mill Ri+1 positioning at a downstream side of the rolling mill Ri regarding each rolling mill Ri, storing a rolling torque Gi of the rolling mill Ri at that time as Gi*, and controlling the peripheral velocity of a rolling mill Rn at a most downstream side of the rolling mill train so that a rolling torque Gn ⁇ 1 of a rolling mill Rn ⁇ 1 positioning at an upstream side of the rolling mill Rn becomes equal to Gn ⁇ 1* which is stored as a rolling torque of the rolling mill
  • the control may be performed by using a torque arm coefficient (G/P) which is a value where a rolling torque of each rolling mill is divided by a rolling load of the rolling mill in place of a value of the rolling torque of each rolling mill of the rolling mill train.
  • G/P torque arm coefficient
  • the rolling may be carried out by fixing a ratio of the peripheral velocity of respective rolling mills Ri after all of the peripheral velocity of the respective rolling mills Ri of the rolling mill train are controlled.
  • a rolling speed of the rolling mill Rn at the most downstream side of the rolling mill train may be increased to a desired speed under a state where the ratio of the peripheral velocity of the respective rolling mills Ri is fixed.
  • a production line of shaped steel having a constitution where a rolling mill train formed of n-pieces of rolling mills of at least three-pieces or more and at least one piece or more of rolling mills or a rolling mill train are tandem-arranged in this order, and carrying out reduction between a horizontal roll side surface and a vertical roll peripheral surface by using one piece or more of rolling mill, in the production line, no-tension control of a material to be rolled is performed in the upstream rolling mill train, the upstream rolling mill train and the downstream rolling mills or rolling mill train are arranged under a state having sufficient distance for the material to be rolled to be bitten into the downstream rolling mills or rolling mill train after the no-tension control is completed, and the rolling method of the shaped steel described above is independently performed at the upstream rolling mill train and the downstream rolling mills or rolling mill train.
  • a production method of shaped steel produced by carrying out reduction between a horizontal roll side surface and a vertical roll peripheral surface including: a first control step of fixing the peripheral velocity of a rolling mill Ri after a material to be rolled is bitten into the rolling mill Ri and before the material to be rolled is bitten into a rolling mill Ri+1 positioning at a downstream side of the rolling mill Ri regarding each rolling mill Ri in a rolling mill train formed of n-pieces of rolling mills of at least three pieces or more and storing a rolling torque Gi of the rolling mill Ri at that time as Gi*, and controlling the peripheral velocity of a most downstream rolling mill Rn of the rolling mill train after the material to be rolled is bitten into the rolling mill Rn so that a rolling torque Gn ⁇ 1 of a rolling mill Rn ⁇ 1 positioning at an upstream side of the rolling mill Rn becomes equal to Gn ⁇ 1* which is stored as a rolling torque of the rolling mill Rn ⁇ 1 before the material to be rolled is bitten into the rolling
  • the present invention it becomes possible to enable stabilization of material passage and improvement in production dimension accuracy by controlling tension between stands with high accuracy by using a simple control system without using table values or the like by each rolling condition even under a condition where a distance between stands is short when shaped steel is rolled by using a continuous rolling mill formed of three pieces or more of rolling mills in a tandem state.
  • FIG. 1 is a schematic explanatory diagram regarding a production line of H-shaped steel.
  • FIG. 2 is a schematic explanatory diagram of a universal rolling mill and an edger rolling mill.
  • FIG. 3 is a schematic plan view of a rolling mill train formed of three pieces of rolling mills of R1-R2-R3.
  • FIG. 4 is a schematic explanatory diagram regarding tension control when a distance between stands is long.
  • FIG. 5 is a schematic explanatory diagram in a case of applying conventional tension control when a distance between stands is extremely short.
  • FIG. 6 is a schematic explanatory diagram in a case of applying tension control according to the present invention when a distance between stands is extremely short.
  • FIG. 7 is a schematic explanatory diagram illustrating a combination of a rolling mill train formed of adjacent rolling mills R1 to R3 and a rolling mill at a downstream position which is sufficiently kept away from the rolling mill train.
  • FIG. 8 is a schematic explanatory diagram illustrating a combination of a rolling mill train formed of adjacent rolling mills R1 to R3 and a second rolling mill train formed of adjacent rolling mills R4 to R6 at a downstream position which is sufficiently kept away from the rolling mill train.
  • FIG. 9 is a schematic explanatory diagram of universal intermediate rolling of H-shaped steel.
  • FIG. 10 is a graphic chart representing a torque change amount of each stand through numerical analysis when tension between stands changes.
  • the “universal rolling mill” in this description indicates a rolling mill which carries out rolling accompanied by large extension at a shaped steel rolling time by using a horizontal roll and a vertical roll
  • the “edger rolling” indicates a rolling mill which carries out extremely soft rolling by being used together with the universal rolling mill, and these rolling mills are sometimes called a “rolling stand” or just a “stand” in this description.
  • FIG. 1 is an explanatory diagram regarding a production line L where a rolling method of shaped steel according to this embodiment is carried out.
  • a heating furnace 2 a rough rolling mill 4 , two pieces of intermediate universal rolling mills 5 , 6 , and a finishing universal rolling mill 8 are sequentially arranged from an upstream side in the production line L.
  • an edger rolling mill 9 is provided between the two pieces of intermediate universal rolling mills 5 , 6 .
  • a steel material in the production line L is collectively denoted as a “material to be rolled S” for explanation and its shape is sometimes illustrated using broken lines, oblique lines and the like in each drawing.
  • the material to be rolled S such as, for example, a slab 11 extracted from the heating furnace 2 is subjected to rough rolling in the rough rolling mill 4 . Then, the material to be rolled S is subjected to intermediate universal rolling in the intermediate universal rolling mills 5 , 6 . Under a state where reverse rolling with this intermediate universal rolling is possible, reduction is carried out for end portions or the like of the material to be rolled (flange corresponding portions 12 ) by the edger rolling mill 9 .
  • an H-shaped raw blank 13 in a dog-bone shape is shaped by reverse rolling in a plurality of passes through those calibers, and the H-shaped raw blank 13 is subjected to application of reduction in a plurality of passes using a rolling mill train formed of the first intermediate universal rolling mill 5 -the edger rolling mill 9 -the second intermediate universal rolling mill 6 , whereby an intermediate material 14 is shaped.
  • the intermediate material 14 is subjected to finish rolling into a product shape in the finishing universal rolling mill 8 , whereby an H-shaped steel product 16 is produced.
  • a flange tip portion becomes an unreduced portion (refer to a broken line portion in the drawing) as it is illustrated in FIG. 2( a ) in each universal rolling mill, and therefore, rolling to shape and reduce the unreduced portion is carried out by the edger rolling mill as illustrated in FIG. 2( b ) .
  • An example of a continuous rolling mill train carrying out rolling of a material to be rolled in a tandem state includes a constitution of the first intermediate universal rolling mill 5 -the edger rolling mill 9 -the second intermediate universal rolling mill 6 as stated above.
  • the rolling mill train having the constitution where a plurality of rolling stands are continuously arranged when shaped steel is rolled as the material to be rolled S, tension control between rolling stands using a looper (tension control device) which is used when a steel strip is rolled or the like is difficult because stiffness of the material to be rolled is large.
  • a distance between stands of the plurality of stands is sometimes set to be short aiming at energy-saving, cost-saving, and downsizing of equipment in the continuous rolling mill train.
  • the distance between stands is shortened when the tandem rolling of the shaped steel is carried out, there is a possibility that the material to be rolled is bitten into a downstream stand before the tension between rolling stands at an upstream side is controlled into a no-tension state, resulting in that the conventional control to make the tension between stands tend to be drawn cannot be stably performed.
  • the tension control method according to the present invention is applicable to any rolling mill as long as it has a constitution where a plurality of rolling mills (stands) are continuously arranged in the equipment carrying out the tandem rolling of the shaped steel.
  • the conventional tension control method and the tension control method according to the present invention are each applied to a rolling mill train where three pieces of stands of R1 to R3 are continuously arranged, are exemplified to be explained.
  • This constitution is an example, and the tension control method according to the present invention is applicable to a rolling mill train of shaped steel where a plurality of rolling mills of at least three pieces or more are arranged in a tandem rolling state.
  • FIG. 3 is a schematic plan view of a rolling mill train 30 formed of three pieces of rolling mills R1-R2-R3, and for example, reverse rolling is carried out in this rolling mill train 30 as illustrated by a broken arrow in the drawing.
  • Each distance between stands of the three pieces of rolling mills (rolling stands) of R1, R2, R3 is shorter than a longitudinal direction length of the material to be rolled S, and the rolling of the material to be rolled S is carried out in, what is called a tandem rolling state.
  • the tension control when the distance between stands is sufficiently long in the rolling mill train 30 formed of three pieces of rolling mills R1-R2-R3 is explained.
  • the constitution where “the distance between stands is sufficiently long” indicates that there is a sufficient distance to carry out and stabilize the no-tension control of the material to be rolled S between stands.
  • FIG. 4 is a schematic explanatory diagram regarding the tension control when the distance between stands is long, and is a schematic diagram illustrating a change of a rolling torque (solid line) and a change of the peripheral velocity (dot and dash line) of each of the rolling mills R1 to R3.
  • respective rolling torques of R1 to R3 are defined as G1 to G3 as values which change with time, and each rolling torque value at a specific moment is denoted by an individual value such as “G1*”.
  • G1 to G3 as values which change with time
  • each rolling torque value at a specific moment is denoted by an individual value such as “G1*”.
  • FIG. 4 schematic diagrams each illustrating a position of the material to be rolled S in each of statuses A, B in the schematic diagram ( FIG. 4 ) are also illustrated.
  • the tension control when the distance between stands is long is explained with reference to FIG. 4 .
  • the constitution where the distance between stands is extremely short indicates a constitution where the material to be rolled S is bitten into a downstream stand before the tension between upstream rolling stands is controlled into the no-tension state.
  • FIG. 5 is a schematic explanatory diagram when the conventional tension control is applied to the case when the distance between stands is extremely short, and is a schematic diagram illustrating a change of a rolling torque (solid line) and a change of the peripheral velocity (dot and dash line) of each of the rolling mills R1 to R3. Also in FIG. 5 , schematic diagrams each showing a position of the material to be rolled S in each of statuses A, B in the schematic diagram ( FIG. 5 ) are also illustrated. The case of applying the conventional tension control to the constitution where the distance between stands is extremely short is explained with reference to FIG. 5 .
  • the present inventors invented a tension control method and a rolling method using the tension control method of fixing the peripheral velocity under a state where forward tension is zero (before the material to be rolled S is bitten into a downstream rolling mill), and sequentially setting the tension between stands to be zero by tracing back after the material to be rolled S is bitten into all of the rolling mills to be objects when tension control is performed in a rolling mill train formed of a plurality of rolling mills.
  • the rolling method according to the present invention is explained.
  • a tension control technique according to the present invention is applied to the constitution where the distance between stands is extremely short in the rolling mill train 30 formed of the three pieces of rolling mills R1-R2-R3.
  • the tension control technique according to the present invention is applicable to a case when tandem rolling is carried out in a rolling mill train formed of an arbitrary n-pieces (n is an arbitrary integer number of three or more) of rolling mills, and here, it is explained by using the rolling mill train 30 formed of the three pieces of rolling mills R1-R2-R3 to simplify the explanation.
  • FIG. 6 is a schematic explanatory diagram when the tension control according to the present invention is applied to the case when the distance between stands is extremely short, and is a schematic diagram illustrating a change of a rolling torque (solid line) and a change of the peripheral velocity (dot and dash line) of each of the rolling mills R1 to R3.
  • FIG. 6 schematic diagrams each showing a position of the material to be rolled S in each of statuses A to C in the schematic diagram ( FIG. 6 ) are also illustrated.
  • the case applying the tension control according to the present invention to the constitution where the distance between stands is extremely short is explained with reference to FIG. 6 .
  • the tension control is performed with high accuracy between respective rolling stands (between R1-R2 and between R2-R3) and it becomes possible to carry out the rolling while keeping the no-tension state by applying the tension control method explained by 1) to 6) with reference to FIG. 6 to the tandem rolling at the rolling mill train 30 .
  • a material passing property of the material to be rolled between rolling stands thereby improves, and deterioration of dimensional accuracy, slip, turning up due to the compressive force, and so on are prevented.
  • table values or the like by each rolling condition are not used, the rolling torques which can be measured are stored, and the tension control over the whole length of the rolling mill train 30 formed of R1-R2-R3 can be performed with high accuracy by using a simple control system.
  • the tension state among all rolling mills can be controlled by sequentially applying this second control step from the rolling mill Rn ⁇ 1 toward the upstream side.
  • temperature change at the rolling time of the material to be rolled S is not particularly mentioned.
  • a dimension of the material to be rolled S is long in a longitudinal direction
  • the temperature of the material to be rolled S changes with time and the rolling torque of each rolling mill fluctuates in accordance with the temperature change when tandem rolling is carried out with a rolling mill train formed of a plurality of rolling mills such as, for example, R1-R2-R3.
  • error in accordance with the fluctuation may occur if the tension control method is applied without taking the fluctuation of the rolling torque due to the temperature change into consideration.
  • a torque arm coefficient (G/P) being a value where a rolling torque (G) is divided by load (P) may be used in place of a value of the rolling torque (G) when the tension control technique described in the above embodiment is applied. It is possible to exclude an effect of the rolling torque change in accordance with the temperature change of the material to be rolled S and perform the control of the tension between stands by performing the tension control method according to the present invention by using the torque arm coefficient (G/P) instead of the rolling torque.
  • a ratio of the peripheral velocity of the respective rolling mills under the stable state may be fixed.
  • the rolling speed is increased after the stable state, the rolling speed of the whole of the rolling mill train is necessary to be increased.
  • the no-tension state (stable state) can be kept by increasing the speed under the state where the fixed ratio of the peripheral velocity is kept as it is.
  • the most downstream rolling mill at the rolling downstream is set to be a desired speed, and the rolling speeds of other rolling mills may be defined such that the ratio of the peripheral velocity becomes as it is in accordance with the rolling speed of the most downstream rolling mill.
  • FIG. 7 is a schematic explanatory diagram illustrating a combination of the rolling mill train 30 formed of adjacent rolling mills (stands) R1 to R3 and a rolling mill F1 which is at a downstream position sufficiently kept away from the rolling mill train 30 .
  • FIG. 8 is a schematic explanatory diagram illustrating a combination of the rolling mill train 30 formed of the adjacent rolling mills R1 to R3 and a second rolling mill train 50 formed of rolling mills F1 to F3 adjacent with each other which are at a downstream position sufficiently keep away from the rolling mill train 30 .
  • the tension control method explained in the above embodiment is applied to the rolling mill train 30 formed of R1 to R3 to stabilize each tension from R1 to R3, and the peripheral velocity of R1 to R3 are fixed before the material to be rolled S is bitten into F1.
  • the tension control method explained in the above embodiment is similarly applied to the second rolling mill train 50 to stabilize the tension states of F1 to F3.
  • a reason why the arithmetic operation timing of the no-tension torque Gj0 was set at 0.1 seconds before the biting into the downstream stand was that a rolling speed was estimated from a distance between stands and a roll speed and an estimation error was taken into consideration to estimate the time required for the material to be rolled to be bitten into the downstream stand, to avoid that the storing timing of the rolling torque was after the biting into the downstream stand.
  • the present invention is applicable to a rolling method of shaped steel which produces the shaped steel such as, for example, H-shaped steel, T-shaped steel, or I-shaped steel, a production line of the shaped steel, and a production method of the shaped steel.

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US16/771,941 2018-01-10 2018-12-27 Rolling method of shaped steel, production line of shaped steel, and production method of shaped steel Abandoned US20200338608A1 (en)

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JP2018001784 2018-01-10
PCT/JP2018/048177 WO2019138908A1 (fr) 2018-01-10 2018-12-27 Procédé de laminage d'acier profilé, ligne de fabrication d'acier profilé et procédé de fabrication d'acier profilé

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US5797288A (en) * 1995-11-25 1998-08-25 Alcatel Alsthom Compagnie Generale D'electricite Apparatus for operating a multiple-stand mill train
US20040221633A1 (en) * 2003-04-11 2004-11-11 Michel Abi-Karam Method and device for controlling the thickness of a rolled product
US20100050727A1 (en) * 2006-10-12 2010-03-04 Berthold Botta Rolling Mill and Method for Controlling a Rolling Mill
US20100326155A1 (en) * 2008-02-27 2010-12-30 Hans-Joachim Felkl Operating method for a multi-stand rolling mill train with strip thickness determination on the basis of the continuity equation

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