EP0745440A1 - Hilfsvorrichtung zum Einfädeln, Walzwerk und Walzstrasse - Google Patents

Hilfsvorrichtung zum Einfädeln, Walzwerk und Walzstrasse Download PDF

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Publication number
EP0745440A1
EP0745440A1 EP96108768A EP96108768A EP0745440A1 EP 0745440 A1 EP0745440 A1 EP 0745440A1 EP 96108768 A EP96108768 A EP 96108768A EP 96108768 A EP96108768 A EP 96108768A EP 0745440 A1 EP0745440 A1 EP 0745440A1
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EP
European Patent Office
Prior art keywords
plate
work rolls
rolls
rolling
plate material
Prior art date
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Application number
EP96108768A
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English (en)
French (fr)
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EP0745440B1 (de
Inventor
Yasutsugu Yoshimura
Toshiyuki Kajiwara
Yoshio Takakura
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Hitachi Ltd
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Hitachi Ltd
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Classifications

    • 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
    • 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
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • 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
    • 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
    • B21B39/008—Rollers for roller conveyors
    • 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
    • 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
    • B21B13/14—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
    • 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
    • B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working 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
    • B21B2269/02—Roll bending; vertical bending of 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
    • 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
    • B21B2273/08—Threading-in or before threading-in
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/20—Track of product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating

Definitions

  • the present invention relates to a compact hot strip mill plant capable of producing a hot strip at a rolling speed in match with an output while improving energy saving, and a rolling method of the same.
  • a related art typical hot strip mill plant is known from a reference "Recent Hot Strip Manufacturing Technique in Japan” (Iron and Steel Association of Japan, pp. 176 and 305-310, August 10, 1987), which describes a high speed/large scale rolling plant exhibiting an output of from 3 to 4 million tons/year and a finishing rolling speed of from 680 to 1627 m/mim.
  • a roughing rolling mill for rolling down a slab having a thickness of 200 mm into a bar having a thickness of from 20 to 40 mm adopts a work roll having a diameter of from 1000 to 1300 mm; and a finishing rolling mill for rolling down a bar having a thickness of from 20 to 40 mm into a strip having a thickness of 12 mm or less adopts a work roll having a thickness of from 600 to 800 mm.
  • the rolling speed at the outlet of the finishing rolling mill is 300 m/min or more for a finishing thickness of 2.5 mm and 600 m/min or more for a thickness of 1.6 mm.
  • the diameter of a work roll used for the fining rolling mill follows the related art size, that is, from 760 to 800 mm.
  • Japanese Patent Laid-open No. Hei 6-320202 discloses a merit in use of small diameter work rolls from the viewpoint of a relationship between a necessary output and the maximum rolling speed of a rolling mill plant or energy saving, and it proposes a production system on the basis of the new concept.
  • Fig. 2 is a view showing comparison in necessary energy between work rolls having diameters of 800 mm and 360 mm of a fining rolling mill in the case of rolling a slab of 200 mm thick into a hot strip of 2 mm thick. As seen from this figure, it becomes apparent that the small diameter roll is effective for energy saving.
  • Japanese Patent Laid-open No. Hei 6-320202 basically uses small diameter work rolls for finishing after-stage stands occurring no problem in biting, and it adopts an indirect drive system in which the work rolls are driven through intermediate rolls or back-up rolls for preventing temperature drop of a material to be rolled due to a strong reduction by the small diameter work rolls. Also, this patent is intended to enhance energy saving by improvement in deforming efficiency of a material to be rolled by the use of the small diameter work rolls.
  • Japanese Patent Laid-open No. Sho 54-149356 describes a rolling mill plant including a device for vertically restricting the rear end of a loop-shaped curved portion generated at the leading end portion of a material to be rolled when the leading end of the material is butted to the rolls and preventing reversed movement of the material, and vertically pressing the loop-shaped curved portion and moving forward the leading end of the material, thereby allowing the material to be bitten in a roll gap.
  • the reversed movement preventive device and the loop pressing device described in Japanese Patent Laid-open No. Sho 54-149356 vertically restrict a material to be rolled.
  • the material must be stopped on the inlet side of the rolling mill.
  • such devices can be used only for a cold rolling plant having an apparatus for storing the material or a single stand rolling mill repeating several rolling steps.
  • the devices cannot be used for the case of rolling a plate material continuously produced from a continuous casting machine, that is, the case of a tandem rolling using a plurality of rolling mills.
  • an object of the present invention is to provide a rolling mill plant capable of enhancing productivity in rolling and improving energy saving.
  • a hot strip mill plant for rolling a plate to be hot-rolled using a plurality of rolling mills each including work rolls, the rolling mill including the work rolls including: plate passing guide members each being provided in such a manner as to be sloped and to vertically surround a pass line of the plate; and rollers each capable of being ascended/descended to a desired position for holding-down a floating of the plate and provided near each of the plate passing guide members.
  • the plate guided between the small diameter work rolls by the plate passing guide members provided in such a manner as to vertically surround the pass line is deflected upward by a reaction force when bitten between the work rolls.
  • the plate is held down by the rollers, each being provided near the plate passing guide members and capable of ascended and descended to a desirable position against the plate guided by the plate passing guide members, and it receives a press-in force larger than the reaction force of the work rolls by the rollers, to be thus bitten between the small diameter work rolls.
  • the above rolling mill preferably includes a roll balance device capable of imparting contact forces between small diameter work rolls and intermediate rolls.
  • the biting of the plate material at the small diameter work rolls can be suitably performed by positively transmitting a torque to the small diameter work rolls when the plate material is bitten between the work rolls.
  • a four-stage rolling mill plant including rolling mills each having a pair of work rolls, a pair of back-up rolls, and a system for scattering a hot-rolling oil to the work rolls, the rolling mill having the work rolls including: plate passing guide members each being provided in such a manner as to vertically surround a pass line of a plate material; and rollers each capable of being ascended/descended to a desirable position for holding down a floating of the plate and provided near each of the plate passing guide members; wherein the plate material is introduced between the work rolls while the hot-rolling oil is scattered on the work rolls.
  • the advance of a plate to be hot-rolled is restricted by the plate passing guide members for guiding the plate between the work rolls on which a hot-rolling oil is scattered and hold-down rollers for holding-down the plate, and a press-in force larger than the reaction force of the work rolls is applied to the plate.
  • the plate can be bitten between the work rolls even in the state in which the hot-rolling oil is continuously scattered.
  • the biting reduction is also determined by a horizontal balance between a force drawing a plate in a roll bite and a rolling reaction force pressing back the plate.
  • the biting reduction can be increased by increasing the press-in force.
  • an edger or a rolling mill is disposed in the before-stage of a rolling mill using small diameter work rolls, and a press-in force applied by the edger or the rolling mill is equal to the total of a buckling force of a plate to be rolled which is buckled in the width direction and a force required for lifting the dead weight of the plate.
  • the biting reduction ⁇ h becomes 10.6 mm from the equation (1).
  • a press-in force of about 7 tons is required as shown in Fig. 3.
  • a press-in force more than 7 tons can be obtained by holding-down the floating height of the plate to a value of 60 mm or less.
  • the floating height of a plate is controlled at a value of 60 mm or less by a pressing roll.
  • the hold-down force becomes 1/30 of the press-in force from the equation (8). In this way, the plate can be sufficiently bitten by a hold-down force which is very smaller than a press-in force.
  • a rolling load is set to obtain a desired plate thickness on the assumption that the plate is sufficiently bitten between rolls. Namely, there is no problem in rolling for a normal portion on which a rolling load is applied; however, at the time of biting, a load and a torque are transiently applied, and consequently, even if a friction coefficient necessary for biting between the plate and the rolls is obtained, the same friction coefficient between the rolls is not necessarily obtained. As a result, in some case, there occurs a biting failure.
  • a transmission torque is a contact load between rolls multiplied by a friction coefficient between the rolls and a roll diameter.
  • a friction coefficient necessary for biting is substantially equal to a friction coefficient for transmitting a rolling torque necessary upon biting. Namely, in the case where the friction coefficient between rolls is low and thereby a necessary torque cannot be transmitted, the low friction coefficient can be compensated by increasing a contact load between a work roll and an intermediate roll or a back-up roll, thereby making it possible to give the necessary torque to the work roll.
  • T1 ⁇ r(P + Fw)R
  • Tr ⁇ PR
  • biting failure in a rolling mill including small diameter work rolls can be prevented by controlling the floating height of a plate and also controlling the roll bending force or roll balance force.
  • FIG. 6 shows the (i-1)-th stand and the i-th stand of a related art type four-stage finishing rolling mill plant.
  • a plate 1 to be rolled passes through the (i-1)-th stand and just reaches the i-th stand.
  • Each stand includes a housing 2 i-1 (2 i ); work rolls 3 i-1 (3 i ); back-up rolls 5 i-1 (5 i ); work roll chocks 6 i-1 (6 i ); project blocks 9 i-1 (9 i ); roll balances or roll bending devices 10 i-1 (10 i ); a reduction jack 11 i-1 (11 i ); a reduction load meter (load cell) 13 i-1 (13 i ); an inlet side plate passing guide 14 i-1 (14 i ); and an outlet side plate passing guides 15 i-1 (15 i ).
  • a roll is desirable to be smaller in diameter for effectively deforming a plate to be rolled at a smaller rolling load and for enabling rolling at a small energy.
  • a work roll is desirable to be as small as possible in diameter.
  • a practical roll however, has a large diameter. The reason for this is due to a biting condition. For example, assuming that a friction coefficient between a plate and a roll is 0.25, mill rigidity is 550 tons/mm, reduction is 20 mm, and rolling load is 2500 tons, the diameter of the roll becomes 760 mm from the equation (1). In general, the diameter of the work roll is selected at about 800 mm. If small diameter rolls each having a diameter of about 460 mm are used for rolling, a plate to be rolled must be pressed between the rolls upon biting of the plate.
  • a rolling mill including hold-down rollers for pressing a plate to be rolled between rolls upon biting of the plate is shown in Fig. 1.
  • Fig. 1 shows a six-stage rolling mill plant including six rolling mills each having small diameter work rolls to which the present invention is applied.
  • the rolling mill includes work rolls 3 i-1 (3 i ); intermediate rolls 4 i-1 (4 i ); back-up rolls 5 i-1 (5 i ); roll balances 10 i-1 (10 i ) for supporting the dead weights of the work rolls 3 i-1 (3 i ); an inlet side plate passing guide 14 i-1 (14 i ); an outlet side plate passing guides 15 i-1 (15 i ); hold-down rollers 17 i-1 (17 i ), 18 i-1 (18 i ) capable of being ascended/descended by hydraulic cylinders; a detector 19 i ; a controller (not shown) for controlling the ascending/descending of the hold-down rollers and roll balance forces of the roll balances 10 i-1 (10 i ) in responce to a signal from the detector 19 i ; and an input device (not shown) for setting an initial set.
  • the hold-down rollers 17 i-1 , 17 i , 18 i-1 , 18 i can be rotated by drive units through joints (not shown); however, even in the case where such drive units are not provided, the biting of a plate to be rolled according to the present invention can be sufficiently carried out.
  • the inlet side plate passing guide 14 i-1 (14 i ) is previously provided with a level difference H i-1 (H i ) of 50 mm or more between a roll bite and a table, and it has such a slope as to near the roll bite level as nearing the roll bite.
  • the inlet plate passing guide 14 i-1 (14 i ), the outlet side plate passing guide 15 i-1 (15 i ), the hold-down rollers 17 i-1 (17 i ), 18 i-1 (18 i ) capable of being ascended/descended by hydraulic cylinders, the detector 19 i , the controller, and the input device constitutes a biting auxiliary device.
  • a biting auxiliary device can be mounted on an existing rolling mill.
  • the roll balances 10 i-1 (10 i ) for supporting the dead weights of the work rolls 3 i-1 (3 i ) are mounted to the existing rolling mill, the roll balances can be controlled by the controller of the biting auxiliary device.
  • the controller and the input device may be provided separately from the rolling mill.
  • Fig. 7 shows a state in which the plate 1 to be rolled passes through the (i-1)-th stand and moves toward the (i)-th stand.
  • a load P0 upon biting of the rolling mill is previously set by the input device.
  • Timings t1 and t2 are set, which allow to descend the hold-down roller 18 i-1 of the before-stage rolling mill and the hold-down roller 17 i of the rolling mill prepared to perform the biting, respectively.
  • the timings t1 and t2 are set in accordance with the rolling speeds of the rolling mills.
  • an output signal of the load cell increases.
  • the controller compares the output signal from the load cell with the predetermined load P0.
  • a timer is started.
  • a time of the timer becomes the predetermined timing t1
  • the hold-down roller 18 i-1 of the (i-1)-th stand shown in Fig. 7 is descended.
  • the time of the timer becomes the predetermined timing t2
  • the hold-down roller 17 i of the i-th stand shown in Fig. 8 is descended.
  • the plate 1 is restricted in gaps H i-1 and H i surrounded by the hold-down rollers 17 i , 18 i-1 , the inlet side guide 14 i , the outlet side guide 15 i-1 and the upper surface of the table.
  • the plate 1 is buckled and deflected upward by a reaction force generated by the plate passing guide 14 i upon biting; however, as shown in Fig. 9, the floating of the plate is held-down by the hold-down rollers 18 i-1 and 17 i .
  • the floating height of the plate 1 is thus held-down by the hold-down rollers 17 i and 18 i-1 , so that there can be obtained a press-in force being so large as to allow the plate 1 to be bitten between the work rolls of the i-th stand.
  • the increase in the detection signal of the load cell 13 i means the biting of the plate 1 between the work rolls 3 i of the i-th stand, and when it is judged that the biting is sufficiently performed, the hold-down rollers 18 i-1 and 17 i are ascended and a looper 16 i is started for performing looper control.
  • the ascending/descending of the hold-down rollers is performed on the basis of the timing of the timer; however, it is not limited thereto and may be performed on the basis of the positional detection of the plate. In any case, when being early descended, the hold-down rollers are possibly brought in contact with the plate, which causes a fear in damaging the plate.
  • the hold-down rollers are preferably disposed and controlled to be descended directly before the plate reaches the small diameter work rolls.
  • the hold-down rollers 18 i-1 and 17 i may be simultaneously descended on the basis of the detection of the plate by the detector disposed near the small diameter work rolls. The above processing steps are shown by a flow chart in Fig. 11.
  • a torque necessary for rolling cannot be directly applied to the ends of the small diameter work rolls in consideration of the strength of a spindle, and thereby the small diameter work rolls are indirectly driven through intermediate rolls or back-up rolls each having a large thickness. Accordingly, upon biting of a plate to be rolled, that is, during the rolling load becomes a normal state, a slip is possibly generated between the work roll and the intermediate roll or back-up roll. To solve such an inconvenience, a contact load between the work roll and the intermediate roll or back-up roll is increased by increasing the output of the balance cylinder 10 i-1 for the work roll of the (i-1)-th stand in Fig.
  • a biting load P0 for a plate to be rolled, a balance force (or roll bending force) for the work roll, and a time "ta" are set.
  • the load signal of the load cell of the (i-1)-th stand exceeds the predetermined load P0, it is judged that the plate 1 is bitten at the (i-1)-th stand, and the balance of the work rolls of the i-th stand is maximized so as to maximize the contact force with the intermediate rolls.
  • the hold-down roller is not particularly specified in its shape; however, it has the following feature.
  • the hold-down roller narrower than the width of a plate to be rolled, the hold-down roller can be reduced in size, and thereby the cylinder for ascending/descending the hold-down roller can be also reduced in size.
  • the hold-down roller does not tend to damage the plate even when it is brought in contact with the plate.
  • the plate can be prevented from being damaged by rotating the hold-down roller by a drive unit and driving it at least until the plate is bitten between the work rolls.
  • the hold-down rollers are provided on the inlet and outlet sides of a rolling mill in this embodiment; however, one hold-down roller may be provided either of the inlet and outlet sides of a rolling mill in accordance with a distance between rolling mills. Also, the same hold-down rollers are not necessarily provided on the inlet and outlet sides of a rolling mill. For example, a hold-down roller narrower than the width of a plate may be provided on the inlet side of a rolling mill and a hold-down roller wider than the width of the plate may be provided on the outlet side of the rolling mill. With this configuration, the plate can be fed to the next rolling mill without damaging the plate on the outlet side of the rolling mill.
  • hold-down rollers each being narrower than the width of a plate may be provided on the before-stage rolling mills and hold-down rollers each being wider than the width of the plate may be provided on the after-stage rolling mills.
  • Fig. 14 shows a four-stage rolling mill plant to which the present invention is applied, in which a hot-rolling oil is sprayed on work rolls and back-up rolls.
  • a hot-rolling oil such as beef tallow oil or a synthetic ester is applied from spray nozzles 22 provided at the inlet side of the work rolls, or the hot-rolling oil is applied from spray headers 24 after roll cooling water adhering on the surface of the rolls is removed with wipers 23 provided on the inlet side of the back-up rolls.
  • a rolling mill of a type shown in Fig. 15 has a pair of work rolls and a pair of back-up rolls, wherein the work rolls and the back-up rolls are respectively crossed with each other within the horizontal plane for controlling a plate thickness distribution in the plate thickness direction of a plate to be rolled.
  • Fig. 16 shows a rolling mill in which a pair of work rolls are crossed with each other within the horizontal plane for controlling the plate thickness distribution in the plate thickness direction of a plate to be rolled.
  • Such a rolling mill uses a hot-rolling oil.
  • inlet and outlet side plate passing guides are respectively provided on the inlet and outlet sides of the rolling mill and also hold-down rollers capable of being ascended/descended by hydraulic cylinders are respectively provided on the inlet and outlet sides of the rolling mill.
  • Fig. 17 shows a rolling mill having rolls each being formed in a guitar-like crown shape and a pair of intermediate rolls reversely moved for controlling the plate thickness distribution in the plate thickness direction of a plate to be rolled; and
  • Fig. 18 shows a cluster mill of a type in which a pair of work rolls are supported by a plurality of back-up rolls.
  • Each of these rolling mills shown in Figs. 17 and 18 can be improved to give a press-in force to the plate by providing the inlet and outlet side plate passing guides on the inlet and outlet sides of the rolling mill and also providing hold-down rollers capable of being ascended/descended by hydraulic cylinders on the inlet and outlet sides of the rolling mill, and thereby it can use small diameter work rolls. As a result, such a rolling mill can be reduced in size.
  • the provision of the hold-down rollers and control of a roll balance force or roll bending force also allows a rolling mill including small diameter work rolls or large diameter work rolls coated with a hot-rolling oil to perform rolling without stoppage of the advance of a plate to be rolled.
  • a plate material produced by a continuous casting machine can be thus rolled by a rolling mill including small diameter work rolls. Namely, it becomes possible to eliminate the necessity of provision a rolling mill for preventing generation of a biting failure of small diameter work rolls in the before-stage of the rolling mill including the small diameter work rolls, and hence to reduce the total size of the rolling mill plant.
  • the diameter of a work roll is gradually reduced by roll grinding, and in some cases, there occurs a biting failure of a plate to be rolled by reduction in roll diameter.
  • the biting failure can be prevented by arrangement of inlet and outlet side plate passing guides, and hold-down rollers capable of being ascended/descended by hydraulic cylinders, for example, as shown in Fig. 1.
  • a detector for detecting the roll diameter is provided on the rolling mill and the ascending/descending of the hold-down rollers and control of the roll bending force are performed when the value detected by the detector is made smaller than a predetermined roll diameter.
  • the present invention provides a rolling mill including small diameter work rolls without any fear in causing a biting failure of a plate to be rolled.
  • the rolling mill can be reduced in size using such small diameter work rolls for reducing a rolling load.
  • biting of a plate to be rolled can be suitably performed, and oil rolling can be performed over the entire plate in the steps from the biting to the tail-out.
  • Fig. 19 shows a six-stage rolling mill plant including rolling mills each having small diameter work rolls.
  • Such a rolling mill is different from that shown in Fig. 1 in configuration of eliminating hold-down rollers for preventing floating of a plate to be rolled upon biting of the plate. Namely, a biting force necessary for biting of the plate between work rolls 3 i of the rolling mill 1 is obtained by the dead weight of the plate.
  • the inlet side plate passing guide 14 i (14 i-1 ) of the inlet and outlet side plate passing guides 14 i (14 i-1 ) and 15 i (15 i-1 ) is disposed lower by a specified value than the upper portion of the lower work roll 3 i as shown in Fig. 20.
  • the plate is deflected downward in the rolling mills 2 i-1 and 2 i . Namely, although the plate tends be floated when the plate is bitten between the work rolls of the rolling mill 2 i , the floating of the plate can be prevented by the dead weight of the plate, and thereby the plate can be smoothly bitten between the work rolls.
  • the interval between the upper portion of the lower work roll and the inlet side plate passing guide on the work roll side may be previously determined on the basis of the equation using the estimated maximum plate thickness on the inlet side and the minimum plate thickness on the outlet side; or the inlet side plate passing guide may be variable by calculating the equation (15) using the rolling schedule and data measured by a plate thickness meter provided on the inlet side of the rolling mill. In this way, by making variable the inlet side plate passing guide, the interval can be matched with the vertical movement of the lower work roll in accordance with the rolling schedule.
  • a rolling bending force or roll balance force may be used in combination upon biting.
  • a rolling mill plant using small diameter work rolls without a failure in biting of a plate to be rolled by provision of an inlet side plate passing guide for making use of the dead weight of the plate.
  • a rolling mill smaller in size than that including hold-down rollers can be provided, and thereby the entire rolling mill plant can be made compact.
  • a rolling mill including large diameter work rolls wherein a hot-rolling oil is used for reducing a rolling power to which the inlet side plate guide specified in arrangement based on the equation (15), eliminates a failure in biting of a plate to be rolled and enables oil rolling over the entire plate in the steps from the biting to the tail-out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Control Of Metal Rolling (AREA)
EP96108768A 1995-06-02 1996-05-31 Warmbandwalzanlage Revoked EP0745440B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP136336/95 1995-06-02
JP13633695 1995-06-02
JP7136336A JP3067589B2 (ja) 1995-06-02 1995-06-02 噛み込み補助装置を備えた小径作業ロール熱間圧延機

Publications (2)

Publication Number Publication Date
EP0745440A1 true EP0745440A1 (de) 1996-12-04
EP0745440B1 EP0745440B1 (de) 2000-04-19

Family

ID=15172840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108768A Revoked EP0745440B1 (de) 1995-06-02 1996-05-31 Warmbandwalzanlage

Country Status (5)

Country Link
EP (1) EP0745440B1 (de)
JP (1) JP3067589B2 (de)
KR (1) KR970000374A (de)
DE (1) DE69607781T2 (de)
TW (1) TW318800B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0803299A1 (de) * 1996-04-23 1997-10-29 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren und Vorrichtung zum Führen eines Bandes zwischen den Gerüsten einer Fertigwalzstrasse
CN103934293A (zh) * 2014-05-05 2014-07-23 重庆钢铁(集团)有限责任公司 一种精轧前钢板除磷导水装置
US9039956B2 (en) 2010-09-22 2015-05-26 Mitsubishi-Hitachi Metals Machinery, Inc. Cooling system for hot-rolled steel strip
DE102018203218A1 (de) 2018-03-05 2019-09-05 Sms Group Gmbh Walzgerüst für ein Warmwalzwerk
CN112742881A (zh) * 2019-10-30 2021-05-04 宝山钢铁股份有限公司 一种用于热轧精轧机组控制带钢走偏的弯辊力使用方法
CN114309089A (zh) * 2021-12-24 2022-04-12 安徽宝泰特种材料有限公司 一种板材轧机卷曲板坯辅助送料装置及其使用方法
CN115972430A (zh) * 2023-01-06 2023-04-18 安徽合从新材料科技有限公司 一种橡胶加工用切粒机

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JP4832656B2 (ja) * 2001-03-30 2011-12-07 協同油脂株式会社 オンラインロール研削特性に優れる熱間圧延油組成物及び熱間圧延方法
CH696521A5 (de) * 2003-08-13 2007-07-31 Main Man Inspiration Ag Verfahren zur Verlängerung des Giesszyklus beim Zweirollen-Bandgiessen sowie Anlage zur Durchführung des Verfahrens.
KR101009894B1 (ko) * 2008-06-26 2011-01-20 현대제철 주식회사 절단기 제어장치 및 방법
CN102248010A (zh) * 2011-06-22 2011-11-23 张家港市宏翔金属制品有限公司 轧机的导位压紧装置
CN110355212B (zh) * 2018-03-26 2020-10-27 宝山钢铁股份有限公司 一种轧机自动停机装置、控制***及控制方法
JP2024524175A (ja) 2021-11-01 2024-07-05 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 作業ロールバランス力設定方法、および圧延機の運転方法、圧延機の運転切り替え方法、並びに圧延機

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JPH0810843A (ja) * 1994-06-28 1996-01-16 Sumitomo Metal Ind Ltd 熱延鋼板の巻き取り装置及び方法

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0803299A1 (de) * 1996-04-23 1997-10-29 DANIELI & C. OFFICINE MECCANICHE S.p.A. Verfahren und Vorrichtung zum Führen eines Bandes zwischen den Gerüsten einer Fertigwalzstrasse
US5860311A (en) * 1996-04-23 1999-01-19 Danieli & C. Officine Meccaniche Spa Method to guide the strip between the stands in a rolling mill finishing train and relative device
US9039956B2 (en) 2010-09-22 2015-05-26 Mitsubishi-Hitachi Metals Machinery, Inc. Cooling system for hot-rolled steel strip
CN103934293A (zh) * 2014-05-05 2014-07-23 重庆钢铁(集团)有限责任公司 一种精轧前钢板除磷导水装置
DE102018203218A1 (de) 2018-03-05 2019-09-05 Sms Group Gmbh Walzgerüst für ein Warmwalzwerk
CN112742881A (zh) * 2019-10-30 2021-05-04 宝山钢铁股份有限公司 一种用于热轧精轧机组控制带钢走偏的弯辊力使用方法
CN114309089A (zh) * 2021-12-24 2022-04-12 安徽宝泰特种材料有限公司 一种板材轧机卷曲板坯辅助送料装置及其使用方法
CN114309089B (zh) * 2021-12-24 2023-04-28 安徽宝泰特种材料有限公司 一种板材轧机卷曲板坯辅助送料装置及其使用方法
CN115972430A (zh) * 2023-01-06 2023-04-18 安徽合从新材料科技有限公司 一种橡胶加工用切粒机

Also Published As

Publication number Publication date
TW318800B (de) 1997-11-01
DE69607781T2 (de) 2000-11-23
JPH08323405A (ja) 1996-12-10
KR970000374A (ko) 1997-01-21
EP0745440B1 (de) 2000-04-19
JP3067589B2 (ja) 2000-07-17
DE69607781D1 (de) 2000-05-25

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