US20210001388A1 - Rolling mill and method of controlling the same - Google Patents

Rolling mill and method of controlling the same Download PDF

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Publication number
US20210001388A1
US20210001388A1 US16/979,438 US201916979438A US2021001388A1 US 20210001388 A1 US20210001388 A1 US 20210001388A1 US 201916979438 A US201916979438 A US 201916979438A US 2021001388 A1 US2021001388 A1 US 2021001388A1
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United States
Prior art keywords
roll
rolling
hydraulic press
press cylinder
rolling mill
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Abandoned
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US16/979,438
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English (en)
Inventor
Rikizo NAKATANI
Yasuhiko MARUYAMA
Tomohiro Kudo
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JP Steel Plantech Co
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JP Steel Plantech Co
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Assigned to JP STEEL PLANTECH CO. reassignment JP STEEL PLANTECH CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MARUYAMA, Yasuhiko, NAKATANI, Rikizo, KUDO, TOMOHIRO
Publication of US20210001388A1 publication Critical patent/US20210001388A1/en
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    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/12—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll camber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • 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

Definitions

  • the present invention relates to a rolling mill and a method of controlling the rolling mill.
  • a rolling mill that includes a roll pair, having a first roll and a second roll, for rolling a bar steel to be rolled, and a first hydraulic press cylinder and a second hydraulic press cylinder for moving the first roll relative to the second roll, the first hydraulic press cylinder and the second hydraulic press cylinder being respectively connected to a first supporting portion and a second supporting portion that rotatably support the first roll at both ends of the first roll, has already been widely available.
  • Patent Document 1 Japanese Examined Utility Model Publication No. H06-46567 (JP 06-46567 Y (1994))
  • the present invention has been made in consideration of such a problem and an object of the present invention is to achieve highly-accurate shape control in rolling a bar steel with the use of an offset rolling mill.
  • a rolling mill that includes a roll pair, having a first roll and a second roll, for rolling a bar steel to be rolled, and a first hydraulic press cylinder and a second hydraulic press cylinder for moving the first roll relative to the second roll, the first hydraulic press cylinder and the second hydraulic press cylinder being respectively connected to a first supporting portion and a second supporting portion that rotatably support the first roll at both ends of the first roll, the rolling mill being characterized in that
  • a rolling area for rolling the bar steel which is set as a partial continuous area in a longitudinal direction of the roll pair, is positioned so that a distance between the first supporting portion and the rolling area and a distance between the second supporting portion and the rolling area differ from each other, and
  • the rolling mill further includes:
  • a distance sensor configured to measure a roll deflection in the rolling area of at least one of the first roll and the second roll
  • a controller configured to control an amount of depression of the first hydraulic press cylinder and an amount of depression of the second hydraulic press cylinder based on a detection value of the distance sensor.
  • FIG. 1 is a schematic front view of a rolling mill 10 according to an embodiment
  • FIG. 2 is a diagram showing relation between a controller 40 and other devices of the rolling mill 10 ;
  • FIG. 3 includes an upper drawing that is a diagram showing a state where rolling is performed with a roll pair sandwiching a bar steel 1 in a bent state, and a lower drawing that is an explanatory diagram for explaining roll deflections of a first roll 14 a;
  • FIG. 4 is a schematic front view of a rolling mill 10 according to a second embodiment.
  • FIG. 5 is a schematic front view of the rolling mill 10 according to a third embodiment.
  • a rolling mill that includes a roll pair, having a first roll and a second roll, for rolling a bar steel to be rolled, and a first hydraulic press cylinder and a second hydraulic press cylinder for moving the first roll relative to the second roll, the first hydraulic press cylinder and the second hydraulic press cylinder being respectively connected to a first supporting portion and a second supporting portion that rotatably support the first roll at both ends of the first roll, is characterized in that
  • a rolling area for rolling the bar steel which is set as a partial continuous area in a longitudinal direction of the roll pair, is positioned so that a distance between the first supporting portion and the rolling area and a distance between the second supporting portion and the rolling area differ from each other, and
  • the rolling mill further includes:
  • a distance sensor configured to measure a roll deflection in the rolling area of at least one of the first roll and the second roll
  • a controller configured to control an amount of depression of the first hydraulic press cylinder and an amount of depression of the second hydraulic press cylinder based on a detection value of the distance sensor.
  • a plurality of the rolling areas may be set at different positions in the longitudinal direction of the roll pair.
  • At least one distance sensor may be provided for each of the plurality of rolling areas set at the different positions.
  • the above-described rolling mill may further include a movably-supporting device that supports the distance sensor movably in the longitudinal direction.
  • the movably-supporting device may include: a mounting portion, to which the distance sensor is fixed; a rail portion, with which the mounting portion slidably engages; and a driving device for moving the mounting portion along the rail portion.
  • the above-described rolling mill may be configured to be able to measure the roll deflections in both end portions of the rolling area in the longitudinal direction.
  • the rolling mill it is made possible to determine the thicknesses of both edge portions of the bar steel in the longitudinal direction based on the roll deflections in both end portions of the rolling area in the longitudinal direction, so that it is made possible to make these thicknesses of both edge portions of the bar steel in the longitudinal direction more even.
  • the controller may be configured to control the amount of depression of the first hydraulic press cylinder and the amount of depression of the second hydraulic press cylinder in real time while the bar steel is rolled.
  • each of the first roll and the second roll may be provided with a caliber in the rolling area.
  • the present invention is more effective because, when rolling is performed with the use of a roll pair provided with the calibers, the rolling is usually, or often, performed with the use of an offset rolling mill.
  • a method of controlling a rolling mill that includes a roll pair, having a first roll and a second roll, for rolling a bar steel to be rolled, and a first hydraulic press cylinder and a second hydraulic press cylinder for moving the first roll relative to the second roll, the first hydraulic press cylinder and the second hydraulic press cylinder being respectively connected to a first supporting portion and a second supporting portion that rotatably support the first roll at both ends of the first roll, is characterized by including:
  • a rolling area for rolling the bar steel which is set as a partial continuous area in a longitudinal direction of the roll pair, is positioned so that a distance between the first supporting portion and the rolling area and a distance between the second supporting portion and the rolling area differ from each other;
  • a rolling mill 10 according to this embodiment is an apparatus for rolling a bar steel 1 to be rolled and is used as an offset rolling mill.
  • This offset rolling mill means the rolling mill 10 characterized by the position of the bar steel 1 during rolling, which will be described in detail later.
  • the bar steel 1 include flat steel, section steel, steel rods, wires, rails, and the like, meaning steel material with a shape having a very large length as compared to the size of the cross-sectional area.
  • flat steel is rolled as the bar steel 1 .
  • FIG. 1 is a schematic front view of the rolling mill 10 according to this embodiment.
  • lateral direction (horizontal direction) on the sheet is defined as “longitudinal direction,” and the left (right) side on the sheet is referred to as “WS (DS)” or “left (right),” while vertical direction on the sheet is defined as “vertical direction,” and the upper (lower) side on the sheet is referred to as “upper (lower) side.”
  • FIG. 2 is a diagram showing relation between a controller 40 and other devices of the rolling mill 10 .
  • a housing 11 of the rolling mill 10 is shown in FIG. 1 .
  • Disposed in the housing 11 (inside the housing 11 ) are a pair of rolls (a first roll 14 a and a second roll 14 b ), supporting portions (a first supporting portion 13 a , a second supporting portion 13 b , and supporting portions for the second roll 14 b ), hydraulic press cylinders (a first hydraulic press cylinder 12 a and a second hydraulic press cylinder 12 b ), load cells (a first load cell 15 a and a second load cell 15 b ), distance sensors 20 , a movably-supporting device 30 , and a balance cylinder mechanism 50 , which are included in the rolling mill 10 .
  • the roll pair is a pair of upper and lower flat rolls, the first roll 14 a and the second roll 14 b .
  • the first roll 14 a and the second roll 14 b are the same in shape and each has a rolling portion with a larger diameter and shaft portions with a smaller diameter, the shaft portions being provided at both ends of the rolling portion in the longitudinal direction.
  • the roll pair catches the bar steel 1 in the gap between the first roll 14 a provided on the upper side and the second roll 14 b provided on the lower side as shown in FIG. 1 , and is rotated for rolling by the rotation driven by a driving portion 32 shown in FIG. 2 .
  • the rolling mill 10 includes the roll pair of the first roll 14 a and the second roll 14 b for rolling the bar steel 1 to be rolled.
  • a plurality of partial continuous areas, corresponding to rolling areas AP, are set in the longitudinal direction of the rolling portions of the roll pair as positions in the longitudinal direction of the roll pair, between which the bar steel 1 is passed, and are stored in a memory unit 41 described later.
  • a plurality of the rolling areas AP are set at different positions in the longitudinal direction of the roll pair.
  • the supporting portions support both ends of each of the rolls of the roll pair in a state where the roll pair are rotatable, so that the roll pair can be rotated by the rotation driven by the driving portion 32 .
  • “both ends of the roll” supported by the supporting portions mean the positions that are symmetric with respect to a roll center line RC (the center line in the longitudinal direction of the roll pair), in other words, the shaft portions (that is, not the rolling portion).
  • the WS shaft portion of the first roll 14 a is supported by the first supporting portion 13 a and the DS shaft portion thereof is supported by the second supporting portion 13 b .
  • These supporting portions are connected to the hydraulic press cylinders with a balance beam 51 interposed therebetween, which will be described later.
  • Both ends of the second roll 14 b are supported by the supporting portions for the second roll 14 b that are fixed to a lower surface of a housing 11 (lower surface of the inside of the housing 11 ).
  • the hydraulic press cylinders (the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b ), which are devices for moving the first roll 14 a relative to the second roll 14 b , are fixed to an upper side surface of the housing 11 (upper side surface of the inside of the housing 11 ) with the load cells, described later, interposed therebetween.
  • the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b are respectively connected to the first supporting portion 13 a and the second supporting portion 13 b and cause the first roll 14 a to move relative to the second roll 14 b by moving the supporting portions, to which the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b are connected.
  • the rolling mill 10 includes the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b for moving the first roll 14 a relative to the second roll 14 b , the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b being respectively connected to the first supporting portion 13 a and the second supporting portion 13 b that rotatably support the first roll 14 a at both ends of the first roll 14 a.
  • the load cells (the first load cell 15 a and the second load cell 15 b ), which are sensors for detecting the pressure applied to the supporting portions by the hydraulic press cylinders connected thereto, are interposed between the housing 11 and the hydraulic press cylinders.
  • the first load cell 15 a is provided between an upper side surface (installation surface) of the first hydraulic press cylinder 12 a and the upper side surface of the housing 11
  • the second load cell 15 b is provided between an upper side surface (installation surface) of the second hydraulic press cylinder 12 b and the upper side surface of the housing 11 .
  • the load cells continuously detect the pressure (reaction force to the pressure applied to the supporting portions by the hydraulic press cylinders connected thereto), at which the load cells are pressed between the housing 11 and the hydraulic press cylinders, as pressure values, at which the hydraulic press cylinders apply the pressure to the connected supporting portions.
  • the load cells immediately transmit the detection results to the controller 40 .
  • the controller 40 has an automatic gap control (AGC) function and can perform compensation, based on the pressure detected by the load cells, by the amount of vertical displacement of the first supporting portion 13 a and the second supporting portion 13 b , the displacement being caused by vertical elongation (vertical deformation) of the housing 11 .
  • AGC automatic gap control
  • the controller 40 having received the pressure values detected by the load cells calculates the amount of vertical deformation of the housing 11 and the amount of vertical deformation of bearings of the supporting portions (members for rotatably supporting the first roll 14 a ), which are not shown, with the use of the detected pressure values.
  • the controller 40 then corrects the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b with the use of the calculated amounts of vertical deformation. Note that the deformation of the bearing is calculated based on a graph between load and radial displacement of the bearing and the detected pressure values.
  • the distance sensors 20 are sensors for measuring the roll deflections, each detecting the distance between the distance sensor 20 and the roll.
  • the “roll deflection” herein means the difference between the vertical position of the roll that is measured by a detection value of the distance sensor 20 in a state where the roll pair is not bent (hereinafter also referred to as the “zero-deflection state”) and the vertical position of the roll that is measured by the detection value of the distance sensor 20 in a state where the roll pair is bent.
  • the distance sensors 20 are fixed to mounting portions 30 a of the movably-supporting device 30 , which will be described later, provided above the first roll 14 a .
  • two distance sensors 20 Over one end portion and the other end portion, in the longitudinal direction, of the rolling area AP for the bar steel 1 to be rolled (both end portions of the rolling area AP), two distance sensors 20 , one over each end portion, are provided. Accordingly, the distance sensors 20 detect the distances to the first roll 14 a in both end portions of the rolling area AP and transmit the detected distances to the controller 40 .
  • eddy-current displacement sensors, laser distance sensors, or the like can be used as the distance sensors 20 .
  • the movably-supporting device 30 is provided on the lower side surface of the balance beam 51 , which is positioned above the first roll 14 a and will be described later, so as to be extended between both end portions, one end portion and the other end portion, of the first roll 14 a .
  • the movably-supporting device 30 includes the mounting portions 30 a , to which the distance sensors 20 are fixed, a rail portion 30 b , with which the mounting portions 30 a slidably engage, and driving devices (not shown) for moving the mounting portions 30 a along the rail portion 30 b .
  • the movably-supporting device 30 is a device for moving the distance sensors 20 between both end portions, one end portion and the other end portion, of the first roll 14 a above the first roll 14 a .
  • both end portions of the roll mean both end portions of the rolling portion of the roll (that is, not the shaft portions).
  • One mounting portion 30 a and one driving device are provided for each distance sensor 20 .
  • a plurality of the mounting portions 30 a can slidably engage one rail portion 30 b . This means that the plurality of mounting portions 30 a (distance sensors 20 ) engaging with the rail portion 30 b are moved along the rail portion 30 b by the driving devices between the one end portion and the other end portion of the rolling portion of the first roll 14 a .
  • the rolling mill 10 includes the movably-supporting device 30 supporting the distance sensors 20 movably along the longitudinal direction.
  • the movably-supporting device 30 has a position detection function of detecting positions of the mounting portions 30 a in the longitudinal direction and the position information obtained by the detection is transmitted to the controller 40 .
  • the controller 40 it is possible to move the mounting portions 30 a carrying the distance sensors 20 along the rail portion 30 b to the instructed positions in the longitudinal direction between the one end portion and the other end portion of the rolling portion by the driving devices as drivers according to instructions from the controller 40 .
  • the controller 40 shown in FIG. 2 is included in the rolling mill 10 and receives information transmitted from various devices as described above.
  • the controller 40 has the memory unit 41 that stores the information, and an arithmetic unit 42 that performs calculation with the use of the received information, the information stored in the memory unit 41 , etc.
  • the controller 40 sends instructions to the various devices based on the results of calculation by the arithmetic unit 42 , etc. In other words, the controller 40 controls the various devices included in the rolling mill 10 based on the various kinds of information.
  • the balance cylinder mechanism 50 includes a first balance cylinder 50 a , a second balance cylinder 50 b , and the balance beam 51 .
  • the first balance cylinder 50 a and the second balance cylinder 50 b are fixed to the upper side surface of the housing 11 so as to be positioned symmetrically with respect to the roll center line RC, and the vertically-movable cylinder portions of the first balance cylinder 50 a and the second balance cylinder 50 b are connected to the balance beam 51 .
  • the balance beam 51 is provided so as to be extended from the first supporting portion 13 a to the second supporting portion 13 b in the longitudinal direction and is configured to, when rolling is not performed, raise the first supporting portion 13 a and the second supporting portion 13 b so as to maintain a gap between the first roll 14 a and the second roll 14 b .
  • the balance beam 51 is also moved accordingly.
  • the balance beam 51 is also connected to the first balance cylinder 50 a and the second balance cylinder 50 b so that the balance beam 51 can pivot about pivot axes extending along the direction perpendicular to the sheet of FIG. 1 .
  • each rolling area AP is set so that the center of the rolling area AP in the longitudinal direction does not coincide with the roll center line RC.
  • each rolling area AP is set so that both end portions of the rolling area AP are positioned asymmetrically with respect to the roll center line RC.
  • the rolling area AP for rolling the bar steel 1 which is set in a partial continuous area in the longitudinal direction of the roll pair, is positioned so that the distance between the first supporting portion 13 a and the rolling area AP and the distance between the second supporting portion 13 b and the rolling area AP differ from each other because the first supporting portion 13 a and the second supporting portion 13 b are provided symmetrically with respect to the roll center line RC.
  • a method of controlling the offset rolling mill (the rolling mill 10 shown in FIG. 1 that shows a state where the bar steel 1 is rolled at one of the set rolling areas AP) will be described below.
  • the upper drawing of FIG. 3 is a diagram showing a state where rolling is performed with the roll pair sandwiching the bar steel 1 in a bent state.
  • the lower drawing of FIG. 3 is an explanatory diagram for explaining the roll deflections of the first roll 14 a . While the roll pair during ordinary rolling is not deflected so greatly as shown in the upper and lower drawings of FIG. 3 , the deflections are exaggerated for ease of understanding.
  • the first roll 14 a is bent so that the central portion (at the roll center line RC) of the first roll 14 a is positioned upward and both ends thereof are positioned downward
  • the second roll 14 b is bent so that the central portion of the second roll 14 b is positioned downward and both ends thereof are positioned upward.
  • control is performed so that the thickness of the bar steel 1 rolled by the offset rolling mill shown in FIG. 1 becomes a predetermined dimension and the thicknesses of both edge portions of the bar steel 1 in the longitudinal direction become equal to each other. Steps of the control will be described in order below.
  • a rolling area AP shown in FIG. 1 is selected as the rolling area AP to be used from among the plurality of rolling areas AP set in the rolling mill 10 .
  • the controller 40 of the rolling mill 10 then disposes, or moves, the distance sensors 20 to the positions corresponding to both end portions, one end portion and the other end portion, of the selected rolling area AP in the longitudinal direction.
  • the rolling mill 10 is configured to be able to measure the roll deflections in both end portions of the rolling area AP in the longitudinal direction.
  • the selection of the rolling area AP to be used may be performed manually, or may be performed, for example, based on the results of detection by a sensor for detecting the rolling area AP of the bar steel 1 , the sensor being provided on the upstream side of the roll pair in the travel direction of the bar steel 1 (direction perpendicular to the sheet in FIG. 1 ).
  • the controller 40 detects the values from the distance sensors 20 in “the state where the roll pair is not bent (zero-deflection state)” described above, and stores the values to the memory unit 41 in advance of rolling.
  • the controller 40 then starts rolling the bar steel 1 in the rolling mill 10 .
  • two distance sensors 20 positioned over a first detection point P 1 and a second detection point P 2 shown in the upper and lower drawings of FIG. 3 (positioned over both end portions of the rolling area AP) detect the distances to the first roll 14 a and transmit the detected values to the controller 40 .
  • the controller 40 having received the detected values of the first detection point P 1 and the second detection point P 2 measures, or calculates, a first roll deflection X 1 from the detected value of the first detection point P 1 and a second roll deflection X 2 from the detected value of the second detection point P 2 .
  • the dashed straight line extending in the longitudinal direction shown in the lower drawing of FIG. 3 is a straight line (hereinafter also referred to as the “reference line BL”) expressing the position of the first roll 14 a in a zero-deflection state.
  • the first roll deflection X 1 and the second roll deflection X 2 are values by which the detection values of the distance sensors 20 received by the controller 40 during rolling differ from the detection values of the distance sensors 20 obtained in the zero-deflection state.
  • the controller 40 having measured the first roll deflection X 1 and the second roll deflection X 2 calculates the amount of depression (compensation amount) of the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b so that the thicknesses of both edge portions of the bar steel 1 in the longitudinal direction are equalized.
  • the arithmetic unit 42 calculates the inclination (corresponding to the inclination S 1 between both end portions) between the first detection point P 1 and the second detection point P 2 in the longitudinal direction with respect to the reference line BL from the first roll deflection X 1 and the second roll deflection X 2 with the use of the following equation.
  • the first distance L 1 is the distance between the first detection point P 1 and the roll center line RC in the longitudinal direction
  • the second distance L 2 is the distance between the second detection point P 2 and the roll center line RC.
  • a supporting-portion distance L which is used in an equation described later, is the distance between the first supporting portion 13 a and the roll center line RC in the longitudinal direction.
  • the arithmetic unit 42 having calculated the inclination S 1 between both end portions calculates compensation values in the vertical direction for the first supporting portion 13 a and the second supporting portion 13 b with the use of the following equations.
  • the controller 40 then causes the supporting portions connected to the respective hydraulic press cylinders to move in the vertical direction based on the calculated compensation values. Specifically, the amount of depression is increased by the average roll deflection and the first supporting portion 13 a and the second supporting portion 13 b are moved in the vertical direction so as to make the inclination S 1 between both end portions parallel to the reference line BL.
  • the compensation amount for the first hydraulic press cylinder 12 a is the sum of the increase of the amount of depression (positive value) corresponding to the average roll deflection, which compensates for shortage of the amount of depression caused by deflection of the rolls, and the increase of the amount of depression (negative value) to make the inclination S 1 between both end portions parallel to the reference line BL.
  • this sum is positive, the amount of depression of the first hydraulic press cylinder 12 a is increased, so that the first supporting portion 13 a is additionally moved downward by the compensation amount.
  • this sum is negative, the amount of depression of the first hydraulic press cylinder 12 a is reduced, so that the first supporting portion 13 a is moved upward by the compensation amount.
  • the compensation amount for the second hydraulic press cylinder 12 b is the sum of the increase of the amount of depression (positive value) corresponding to the average roll deflection, which compensates for shortage of the amount of depression caused by deflection of the rolls, and the increase of the amount of depression (positive value) to make the inclination S 1 between both end portions parallel to the reference line BL. This means that the amount of depression of the second hydraulic press cylinder 12 b is increased, and therefore, the second supporting portion 13 b is additionally moved downward by the compensation amount.
  • the second roll 14 b is also bent as in the case of the first roll 14 a , and therefore, it is also necessary to perform correction (control) of the hydraulic press cylinders, focusing on the second roll 14 b .
  • the second roll 14 b is also bent similarly to the first roll 14 a .
  • the rolls are bent symmetrically in the vertical direction with respect to the center line of the bar steel 1 in the thickness direction (vertical direction).
  • the first roll 14 a is moved in the vertical direction by the sum of the amount corresponding to the deflection of the first roll 14 a and the amount corresponding to the deflection of the second roll 14 b (that is, twice of the amount corresponding to the deflection of the first roll 14 a ).
  • This makes it possible to perform control the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b , focusing on both of the first roll 14 a and the second roll 14 b.
  • the controller 40 controls the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b based on the detection values of the distance sensors 20 so as to reduce the dimensional error of the bar steel 1 by compensating for shortage of the amount of depression caused by deflection of the rolls and to improve accuracy in shape of the cross section by reducing the inclination of the first roll 14 a between both end portions of the rolling area AP in the longitudinal direction set in the first roll 14 a and reducing the inclination of the second roll 14 b between both end portions of the rolling area AP in the longitudinal direction set in the second roll 14 b.
  • the controller 40 When the controller 40 according to this embodiment receives the information on distance at the first detection point P 1 and the second detection point P 2 from the distance sensors 20 , the controller 40 immediately calculates the compensation amount at the arithmetic unit 42 . When compensation is needed, the controller 40 controls the amount of depression of the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b and waits for the next transmission from the distance sensors 20 . The distance sensors 20 continuously detect the distance to the first detection point P 1 and the distance to the second detection point P 2 and immediately transmit the detection results to the controller 40 . In other words, the controller 40 controls the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b in real time while the bar steel 1 is rolled.
  • the rolling mill 10 includes: the roll pair having the first roll 14 a and the second roll 14 b for rolling the bar steel 1 to be rolled; and the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b for moving the first roll 14 a relative to the second roll 14 b , the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b being respectively connected to the first supporting portion 13 a and the second supporting portion 13 b that rotatably support the first roll 14 a at both ends of the first roll 14 a .
  • each of the rolling areas AP for rolling the bar steel 1 is positioned so that the distance between the first supporting portion 13 a and the rolling area AP and the distance between the second supporting portion 13 b and the rolling area AP differ from each other.
  • the rolling mill 10 further includes the distance sensors 20 configured to measure the roll deflections at the rolling areas AP of the first roll 14 a , and the controller 40 configured to control the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b based on the detection values of the distance sensors 20 . Accordingly, it is made possible to achieve highly-accurate shape control in rolling the bar steel 1 with the use of the offset rolling mill.
  • the rolling mill 10 includes the distance sensors 20 configured to measure the roll deflections at the rolling areas AP of the first roll 14 a , and the controller 40 configured to control the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b based on the detection values of the distance sensors 20 .
  • the controller 40 configured to control the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b based on the detection values of the distance sensors 20 .
  • controller 40 controls the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b in accordance with the roll deflections, it is made possible to achieve highly-accurate shape control in rolling the bar steel 1 with the use of the offset rolling mill.
  • the rolling mill 10 is configured to be able to measure the roll deflections in both end portions of the rolling area AP in the longitudinal direction. Accordingly, by correcting the amount of depression of the hydraulic press cylinders based on the roll deflections in both end portions of the rolling area AP in the longitudinal direction, it is made possible to reduce the dimensional error of the bar steel 1 by compensating for shortage of the amount of depression caused by deflection of the rolls and to reduce the inclination of the first roll 14 a between both end portions of the rolling area AP in the longitudinal direction set in the first roll 14 a and the inclination of the second roll 14 b between both end portions of the rolling area AP in the longitudinal direction set in the second roll 14 b , which makes it possible to achieve highly-accurate shape control.
  • the controller 40 controls the amount of depression of the first hydraulic press cylinder 12 a and the amount of depression of the second hydraulic press cylinder 12 b in real time while the bar steel 1 is rolled. Since the controller 40 controls the amount of depression of the hydraulic press cylinders in real time, control is swiftly performed when it becomes necessary to control the amount of depression of the hydraulic press cylinders. This means that more accurate shape control is achieved in rolling the bar steel 1 with the use of the offset rolling mill.
  • the rolling areas AP are set at different positions in the longitudinal direction of the roll pair and the present invention can be applied to all the rolling areas AP set at the different positions in the longitudinal direction of the roll pair. This means that it is possible to achieve highly-accurate shape control regardless in which of the rolling areas AP the bar steel 1 is rolled.
  • the rolling mill 10 includes the movably-supporting device 30 that supports the distance sensors 20 movably in the longitudinal direction.
  • the movably-supporting device 30 can move the distance sensors 20 to the rolling area AP after the switch and the moved distance sensors 20 can detect the values at the rolling area AP after switch. Accordingly, it is possible to reduce the number of distance sensors 20 as compared to the case where the distance sensors 20 are provided for every one of the plurality of rolling areas AP.
  • the movably-supporting device 30 includes the mounting portions 30 a , to which the distance sensors 20 are fixed, the rail portion 30 b , with which the mounting portions 30 a slidably engage, and the driving devices for moving the mounting portions 30 a along the rail portion 30 b .
  • the roll pair is made up of the flat rolls in the above-described embodiment, the present invention is not limited to this configuration.
  • the roll pair may be provided with calibers (grooves provided in the roll pair and formed in the same cross-sectional shape as that of the bar steel 1 , for forming the cross-sectional shape of the bar steel 1 by passing the bar steel 1 through the grooves; the grooves correspond to the rolling areas AP).
  • Each of the first roll 14 a and the second roll 14 b may be provided with the caliber(s) in the rolling area(s) AP.
  • the rolling is usually, or often, performed with the use of an offset rolling mill and therefore, the present invention is more effective.
  • the present invention is not limited to this configuration.
  • the position of the movably-supporting device 30 may be changed and a first supporting-portion balance cylinder 60 a and a second supporting-portion balance cylinder 60 b may be provided instead of the balance cylinder mechanism 50 .
  • FIG. 4 is a schematic front view of a rolling mill 10 according to a second embodiment. As shown in FIG. 4 , differences from the first embodiment are as follows: the movably-supporting device 30 is provided on the upper side surface of the housing 11 ; and instead of the balance cylinder mechanism 50 , the first supporting-portion balance cylinder 60 a is provided for the first supporting portion 13 a and the second supporting-portion balance cylinder 60 b is provided for the second supporting portion 13 b.
  • FIG. 5 is a schematic front view of the rolling mill 10 according to a third embodiment.
  • the third embodiment differs from the second embodiment in that the fixed beam 70 is provided separately from the housing 11 and the movably-supporting device 30 is provided on the lower side surface of the fixed beam 70 instead of the housing 11 .
  • the inclination of the first roll 14 a (difference in height between the first supporting portion 13 a side and the second supporting portion 13 b side) caused by the difference between the pressing loads on the first supporting portion 13 a side and the second supporting portion 13 b side (measurement values obtained from the first load cell 15 a and the second load cell 15 b ) is compensated for owing to the AGC function. Accordingly, the balance beam 51 (rail portion 30 b ) provided with the distance sensors 20 is always kept horizontal and the controller 40 can therefore correctly measure the roll deflections based on the detection values of the distance sensors 20 .
  • the rail portion 30 b cannot be kept in a horizontal position with the use of the AGC function and therefore, the controller 40 cannot correctly measure the roll deflections based on the detection values of the distance sensors 20 .
  • the controller 40 in the second embodiment and the third embodiment corrects the detection values of the distance sensors 20 by the amount of displacement caused by the vertical deformation of the housing 11 and controls the amount of depression of the hydraulic press cylinders 12 a and 12 b based on the corrected values.
  • the distance sensors 20 are provided only above the first roll 14 a in the above-described embodiments, the present invention is not limited to this configuration.
  • the distance sensors 20 may be provided only below the second roll 14 b or may be provided both above the first roll 14 a and below the second roll 14 b .
  • the controller 40 may perform the calculation, described in connection with the above embodiments, with regard to the rolling areas AP of the second roll 14 b .
  • the controller 40 may perform the calculation, described in connection with the above embodiments, with regard to both of the rolling areas AP of the first roll 14 and the rolling areas AP of the second roll 14 b , and, based on the results of the calculation (without the assumption that one of the rolls is bent symmetrically in the vertical direction with respect to the center line of the bar steel 1 in the vertical direction), the controller 40 may calculate the amount of depression of the first hydraulic press cylinder 12 a and the second hydraulic press cylinder 12 b for control.
  • the rolling mill 10 includes the distance sensors 20 configured to measure the roll deflections in the rolling areas AP of at least one of the first roll 14 a and the second roll 14 b.
  • the rolling mill is provided with the movably-supporting device 30 to move the distance sensors 20 in the longitudinal direction in the above-described embodiments
  • the present invention is not limited to this configuration.
  • the distance sensors 20 may be provided for all the plurality of rolling areas AP in an immovable manner.
  • a configuration may be adopted such that at least one distance sensor 20 is provided for each of the plurality of rolling areas AP set at different positions.
  • this configuration it is possible to omit the mechanism for moving the distance sensors 20 and therefore, it is possible to simplify the structure related to the distance sensors 20 .
  • control performed in the rolling mill 10 using two distance sensors 20 has been described in connection with the above-described embodiments, the present invention is not limited to this configuration.
  • three or more distance sensors 20 may be used to control the rolling mill 10 .
US16/979,438 2018-03-27 2019-01-16 Rolling mill and method of controlling the same Abandoned US20210001388A1 (en)

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JP2018059550A JP6832309B2 (ja) 2018-03-27 2018-03-27 圧延機及び圧延機の制御方法
JP2018-059550 2018-03-27
PCT/JP2019/001024 WO2019187508A1 (ja) 2018-03-27 2019-01-16 圧延機及び圧延機の制御方法

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WO (1) WO2019187508A1 (ja)

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CN115815338A (zh) * 2023-01-10 2023-03-21 太原理工大学 一种适用双机联动的超大型轴类楔横轧机的液压压下系统

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CN115815338A (zh) * 2023-01-10 2023-03-21 太原理工大学 一种适用双机联动的超大型轴类楔横轧机的液压压下系统

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CN111902223A (zh) 2020-11-06
CN111902223B (zh) 2022-03-01
TW201941840A (zh) 2019-11-01
TWI701089B (zh) 2020-08-11
WO2019187508A1 (ja) 2019-10-03
JP6832309B2 (ja) 2021-02-24
KR20200121877A (ko) 2020-10-26
JP2019171394A (ja) 2019-10-10

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