US3587263A - Method and apparatus for steering strip material through rolling mills - Google Patents

Method and apparatus for steering strip material through rolling mills Download PDF

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Publication number
US3587263A
US3587263A US782599A US3587263DA US3587263A US 3587263 A US3587263 A US 3587263A US 782599 A US782599 A US 782599A US 3587263D A US3587263D A US 3587263DA US 3587263 A US3587263 A US 3587263A
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United States
Prior art keywords
strip
rolls
roll
gage
strip material
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Expired - Lifetime
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US782599A
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English (en)
Inventor
Joseph A Mccarthy
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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    • 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
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • 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
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering

Definitions

  • the invention also encompasses strip steering for other purposes as well as strip steering in combination with strip shaping and gage control.
  • the present invention provides new and improved method and means for steering metal strip material through a rolling mill whereby the strip can be caused to pass along a straight line path parallel to the mill center line.
  • an object of the invention is to provide an improved steering system and method for strip material passing through a rolling mill wherein the roll forces at opposite ends of the rolls are measured, and if the roll forces are not the same, indicating a cambered condition of the strip material passing through the mill, the roll spacing at a selected edge of the strip is changed whereby the roll forces are the same.
  • Still another object of the invention is to provide a combined strip steering and gage control system for a rolling mill wherein roll force measurements are taken at the opposite ends of the rolling mill rolls and utilized in a combined strip steering, strip shaping and strip gage control system.
  • a still further object of the invention is to provide a new and improved method for steering strip material through a rolling mill, including strip shaping and strip gage control functions.
  • means areprovided for producing a first electrical signal which varies as a function of the roll force at one end of rolling mill rolls through which strip material passes, and further means are provided for producing a second electrical signal which varies as a function of the roll force at the other end of the aforesaid rolls.
  • the first and second electrical signals are compared to derive a differential electrical signal and this differential signal is used to vary the spacing between one end of the rolls until said roll forces are substantially equal and said differential signal is zero, or some empirically derived offset value near zero.
  • control of roll forces at opposite ends of the rolls can be utilized to steer the strip through the mill, either under threading conditions or otherwise, to shape the rolls, and to control gage. This is done preferably by means of a computer, responsive to various'mill parameters, which regulates the roll forces at opposite ends of the'rolls.
  • FIG.1 is a schematic illustration of the effect of camber in strip material on rolling mill rolls
  • FIG. 2 is a schematic diagram of one embodiment of the present invention particularly adapted for use in rolling mill threading operations.
  • FIG. 3 illustrates a computer-controlled combined strip steering, strip shaping and strip gage control system.
  • the strip material being rolled between rolls I0 and I2 is identified by the reference numeral I4, the thickness of the strip being greatly exaggerated for purposes of explanation.
  • the right side of thestrip is thicker than the left side.
  • the screwdowns on the opposite ends of the rolls are adjusted such that the spacing between the rolls at their opposite ends is substantially the same.
  • the roll force at the right side will be much greater than at the left.
  • the strip, in passing through the parallel rolls I0 and I2 will tend to curve or bow off to the left of the centerline of the mill, making it difficult to thread it through a succeeding roll stand or into a coiler.
  • FIG. 2 Apparatus for preventing the strip from turning off the centerline of the mill during threading is shown in FIG. 2.
  • Two rolling mill stands are shown and identified as SI and S2.
  • Each stand includes a pair of work rolls I6 and 18 and associated backup rolls 20 and 22.
  • At the opposite sides of the stand 81 are screwdown mechanisms schematically illustrated at 24 and 26.
  • These screwdown mechanisms can be replaced with equivalent wedge systems or mechanical linkages designed to regulate the spacing between the rolls, all within the skill of the art.
  • the screwdown mechanisms 24 and 26 driven by means of motors 28 and 30, control the screwdown force or pressure on journals at the opposite ends of the roll 20.
  • the mechanisms 24 and 26 can be driven by means of equivalent electrical or hydraulic actuators.
  • Screwdown motors 28 and 30 are controlled by screwdown motor control circuits 32 and 34, respectively.
  • the screwdown motors 28 and 30 are normally controlled by means of a gage control circuit 36 which maintains the spacing between the work rolls [6 and 18 at their opposite ends substantially the same.
  • the electrical signals proportional to the roll forces at the left'and right ends of the rolls are applied via leads 40 and 42 to a differential amplifier 44 which will produce identical outputs on leads 46 and 48 comprising angelectrical signal proportion to the difference between the magnitude of the signals on leads 40 and 42.
  • the roll force signals on leads 40 and 42 are also applied to two comparators 50 and 52. Comparator 50 will produce an output signal on lead 54 when the rollforce signal on lead 40 is greater than that on lead 42. Similarly, the comparator 52 will produce an output signal on lead 56 when the right roll force signal on lead 42 is greater than that on lead 40.
  • the signals on leads 46 and 54 are applied to a gate 58, the signal on lead 54 acting to enable the gate.
  • a current sensor 74 is provided for the armature of motor M1 and, similarly, a current sensor 76 is provided for the armature of motor M2.
  • the current through the motor armature will increase.
  • This increase in motor armature current through motor Ml generates a signal on lead 78 which enables the gates 62 and 70.
  • the signal on lead 78 disables gate 80 through which signals from the gage control circuit 36 are applied to the screwdown control circuits 32 and 34.
  • gage control systems such as a more or less simple feedback system wherein the gage at the output of a stand is measured by a suitable thickness gage, such as X-ray gage 84.
  • a roll force gage control system may also be utilized in accordance with the equation:
  • FIG. 3 a computer-controlled circuit is shown which provides strip steering during threading, gage control, load distribution of stand motor, and scheduled successive stand screwdown settings.
  • the rolling mill includes five stands, only stands S1, S2 and S being shown for purposes of illustration.
  • a conventional coiler 81 driven by motor 83 and controlled by motor control circuit 85.
  • Each stand is provided with a screwdown mechanism SCl, SC2 and SC5, which incorporates means for controlling the roll forces on opposite ends of the rolls for each stand. Left and right roll forces are sensed by load cells LIL, LlR, L2L, L2R, and so on.
  • two input X-ray gages 88 and 90 are employed, the thickness of the material sensed by these gages being fed to a control computer 92 along with screw settings sensed by screwdowns SCI, SC2 and so on.
  • the roll forces are sensed by lead cells LlL, LlR, L2L, and so on; and final exit gage is sensed by X-ray gage 94.
  • Each of the stands is provided with a drive motor M1 through M5, and the tension in the strip between the stands is sensed by tensiorneters Tl through T4 which produce electrical signals, proportional to tension, which are fed to computer 92.
  • the computer 92 is provided with a predetermined stored program in its memory as shown.
  • camber in the entering strip can be sensed by the X-ray gages 88 and 90 by virtue of a variation in the thickness of the strip at its opposite edges.
  • This information when fed to the master control computer 92, can be used to adjust the screwdown SCl, for example, in order to adjust the spacing between the rolls as desired at their respective ends even before the strip enters the roll bite to maintain the left and right roll forces substantially the same until threading through the first stand and into the second stand is completed as sensed, for example, by a surge in armature current of the motor M2.
  • the computer 92 corrects the strip shape out of the first stand relative to input strip shape errors as sensed by the two X-ray gages 88 and 90 through suitable adjustment of either the right or the left screwdown for stand S1 as required.
  • strip steering is no longer a problem relative to the first stand since the strip is held in position by the second stand.
  • reduced shape corrections can be fed forward into the second stand and even the third and succeeding stands to correct input strip shape errors within the limits of desired steering of the strip.
  • mass flow gage control principles can be used with interstand tensions controlled to determine the delivery thickness from each of the stands, and final gage can be corrected, if necessary, from a reading obtained by the final output X-ray gage 94.
  • the reading from gage 94 will override computed, desired output gage as determines from mass flow or roll force gage control techniques.
  • the computer 92 can be programmed in advance with known roll bending characteristics as a function of F compared with F This can be utilized for roll bending and shape control purposes.
  • the means for comparing said first and second electrical signals to produce a differential signal comprises a differential amplifier, a pair of gating devices, means for applying the output of said differential amplifier to both of said gating devices, means for enabling one of said gating devices when sald first electrical signal is greater in magnitude than said second electrical signal, means for enabling the other of said gating devices when said second electrical signal is greater than said first electrical signal, a first screwdown mechanism for one side of said rolls, means connecting the output of said first gating device to said first screwdown mechanism, a second screwdown mechanism for the other side of said rolls, and means connecting the output of said second gating device to said second screwdown mechanism.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US782599A 1968-12-10 1968-12-10 Method and apparatus for steering strip material through rolling mills Expired - Lifetime US3587263A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78259968A 1968-12-10 1968-12-10

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US3587263A true US3587263A (en) 1971-06-28

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US (1) US3587263A (de)
AT (1) AT294737B (de)
DE (1) DE1961585A1 (de)
FR (1) FR2025805B1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006618A (en) * 1974-07-23 1977-02-08 Samon Yanagimoto Method of producing seamless steel tube
US4022040A (en) * 1975-09-25 1977-05-10 T. Sendzimir, Inc. Method of operation and control of crown adjustment system drives on cluster mills
DE2811778A1 (de) * 1977-03-17 1978-10-05 Bethlehem Steel Corp Vorrichtung und verfahren zum steuern einer strangwalzanlage
DE3000187A1 (de) * 1979-01-17 1980-12-04 Hitachi Ltd Verfahren und vorrichtung zum korrigieren des asymmetrischen zustands in einem walzwerk
DE2927769A1 (de) * 1979-07-10 1981-02-05 Schloemann Siemag Ag Verfahren und anlage zur planwalzung von bandmaterial aus stahl und nichteisenmetall
US4513594A (en) * 1983-08-22 1985-04-30 Tippins Machinery Company, Inc. Method and apparatus for combining automatic gauge control and strip profile control
US4700312A (en) * 1978-12-27 1987-10-13 Hitachi, Ltd. Method and apparatus for controlling snake motion in rolling mills
US20040065133A1 (en) * 2002-01-28 2004-04-08 Kenichi Sasaki Method of producing seamless steel tubes
DE102004046249A1 (de) * 2004-09-23 2006-06-08 Thyssenkrupp Nirosta Gmbh Verfahren zum Betrieb einer Zweiwalzengießmaschine zum Gießen von Band aus einer Metallschmelze
US20060230804A1 (en) * 2003-03-20 2006-10-19 Shigeru Ogawa Method and device for rolling metal plate material
US20080098784A1 (en) * 2004-08-28 2008-05-01 Hans-Georg Hartung Method for Straigtening a Metal Strip and Straightening Machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1458973A (en) * 1973-08-23 1976-12-22 Gec Elliott Automation Ltd Methods of rolling strip materials and strip materials rolled thereby apparatus for making nuts
JPS59189011A (ja) * 1983-04-12 1984-10-26 Ishikawajima Harima Heavy Ind Co Ltd 圧延材の蛇行及び横曲り制御方法及びその装置
DE4091342C2 (de) * 1989-07-31 1993-11-04 Toshiba Kawasaki Kk Vorrichtung zur lagesteuerung einer walzplatte
CN113953479B (zh) * 2021-10-25 2023-02-24 江苏沙钢集团有限公司 一种改善薄带钢钢卷翻边的方法

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006618A (en) * 1974-07-23 1977-02-08 Samon Yanagimoto Method of producing seamless steel tube
US4022040A (en) * 1975-09-25 1977-05-10 T. Sendzimir, Inc. Method of operation and control of crown adjustment system drives on cluster mills
DE2811778A1 (de) * 1977-03-17 1978-10-05 Bethlehem Steel Corp Vorrichtung und verfahren zum steuern einer strangwalzanlage
US4700312A (en) * 1978-12-27 1987-10-13 Hitachi, Ltd. Method and apparatus for controlling snake motion in rolling mills
DE3000187A1 (de) * 1979-01-17 1980-12-04 Hitachi Ltd Verfahren und vorrichtung zum korrigieren des asymmetrischen zustands in einem walzwerk
US4320643A (en) * 1979-01-17 1982-03-23 Hitachi, Ltd. Method and apparatus for correcting asymmetrical condition in rolling mill
DE2927769A1 (de) * 1979-07-10 1981-02-05 Schloemann Siemag Ag Verfahren und anlage zur planwalzung von bandmaterial aus stahl und nichteisenmetall
US4513594A (en) * 1983-08-22 1985-04-30 Tippins Machinery Company, Inc. Method and apparatus for combining automatic gauge control and strip profile control
US20040065133A1 (en) * 2002-01-28 2004-04-08 Kenichi Sasaki Method of producing seamless steel tubes
US7028518B2 (en) * 2002-01-28 2006-04-18 Sumitomo Metal Industries, Ltd. Method of producing seamless steel tubes
US20060230804A1 (en) * 2003-03-20 2006-10-19 Shigeru Ogawa Method and device for rolling metal plate material
US7481090B2 (en) * 2003-03-20 2009-01-27 Nippon Steel Corporation Rolling method and rolling apparatus for flat-rolled metal materials
US20090151413A1 (en) * 2003-03-20 2009-06-18 Nippon Steel Corporation Rolling method and rolling apparatus for flat-rolled metal materials
US7775080B2 (en) 2003-03-20 2010-08-17 Nippon Steel Corporation Rolling method and rolling apparatus for flat-rolled metal materials
US7775079B2 (en) 2003-03-20 2010-08-17 Nippon Steel Corporation Rolling method and rolling apparatus for flat-rolled metal materials
US20080098784A1 (en) * 2004-08-28 2008-05-01 Hans-Georg Hartung Method for Straigtening a Metal Strip and Straightening Machine
US7530250B2 (en) * 2004-08-28 2009-05-12 Sms Demag Ag Method for straightening a metal strip and straightening machine
DE102004046249A1 (de) * 2004-09-23 2006-06-08 Thyssenkrupp Nirosta Gmbh Verfahren zum Betrieb einer Zweiwalzengießmaschine zum Gießen von Band aus einer Metallschmelze
DE102004046249B4 (de) * 2004-09-23 2006-07-27 Thyssenkrupp Nirosta Gmbh Verfahren zum Betrieb einer Zweiwalzengießmaschine zum Gießen von Band aus einer Metallschmelze

Also Published As

Publication number Publication date
FR2025805B1 (de) 1973-03-16
DE1961585A1 (de) 1970-06-18
AT294737B (de) 1971-12-10
FR2025805A1 (de) 1970-09-11

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