US3290912A - Rolling mill control apparatus - Google Patents

Rolling mill control apparatus Download PDF

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Publication number
US3290912A
US3290912A US346270A US34627064A US3290912A US 3290912 A US3290912 A US 3290912A US 346270 A US346270 A US 346270A US 34627064 A US34627064 A US 34627064A US 3290912 A US3290912 A US 3290912A
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United States
Prior art keywords
stand
tension
strip
signal
workpiece
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Expired - Lifetime
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US346270A
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English (en)
Inventor
Reid Warren
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CBS Corp
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Westinghouse Electric Corp
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Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US346270A priority Critical patent/US3290912A/en
Priority to GB4223/65A priority patent/GB1072866A/en
Priority to BE660010A priority patent/BE660010A/xx
Application granted granted Critical
Publication of US3290912A publication Critical patent/US3290912A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B37/48—Tension control; Compression control

Definitions

  • the performance of multi-stand tandem rolling mills is determined in part by the respective strip tensions between the various stands of the rolling mill. If the tension in the strip between a given pair of stands is too low, the rolling mill may not track properly such that the strip workpiece will tend to move across the face of the work rolls. If the tension is too high in the strip between a given pair of work stands, the strip may break or in the case of hot mills the strip may neck down or decrease in width and result in the need for excessive trimming of the delivered strip workpiece and consequent increase in scrap. Wide variations in the inter-stand tensions result in detrimental effects on the strip gauge or shape and may possibly result in poor surface characteristics.
  • Hot strip mills installed in recent yea-rs have been equipped with special devices to indicate or exert some degree of control on the inter-stand tension, such as tensiometers or loopers.
  • the tensiometer measures the force in the strip as it passes over the rotating tensiometer roll, and is essentially a spring scale in which the vertical force exerted is a function of the strip workpiece tension.
  • the looper measures the deviation in the pass line from some preselected value and is essentially a roll supported by a torque a-rm driven from some external source of power.
  • the external source of power for the looper may be pneumatic or hydraulic or may be electrical in the form of a torque motor or an eddy current coupling device.
  • Both the tensiometer and the looper have been applied with varying degrees of success.
  • Each of the latter dcvices has certain inherent disadvantages, with some common to both devices, such as requiring contact with the strip which could mark the strip surface, and being vulnerable to damage in the event of a cobble.
  • Both devices require adjustment in pass line height following a .roll change in the mill, and the output signal from either device is affected by the weight of the strip and the bending force required to bend the strip at each stand as well as over the deflecting roll itself. In addition, both devices are rather expensive.
  • a noncontactin-g inter-stand tension sensing and control apparatus which employs a roll force sensing device or transducer.
  • the roll force transducer is mounted between the frame of a given roll stand and at least one of the rolls, such as a work roll or a back-up roll, in such a manner that it measures a portion of the effective strip horizontal or tension force acting on that particular roll stand. It is intended here to cover the provision of roll force transducers on either the entry or delivery side of the mill stand or both and associated with either the work rolls or the back-up rolls or both.
  • the roll force transducer is operative to provide a first control signal when the strip workpiece is operative with the particular stand N of interest and has not yet become operative with the next succeeding stand N+l or tension providing device, and is thereafter and subsequently operative to provide a control signal including the rolling load on the particular stand N of interest plus the forward tension between stand N and the next succeeding stand N+1 minus the back tension between stand N and the preceding stand N-1.
  • a control signal is provided as a function of the actual forward tension in the strip workpiece and is compared with a reference or desired tension to provide a forward tension error signal that is available for correcting the operative speed of stand N or other stands associated therewith or the operation of strip tension determining devices operative with stand N as may be desired.
  • FIGURE 1 shows a four high rolling mill having top and bottom work rolls and top and bottom back-up rolls operative with a strip workpiece;
  • FIG. 2 is a general showing of the present tension control apparatus for a tandem rolling mill
  • FIG. 3 is a schematic showing of control apparatus in accordance with the teachings of the present invention.
  • FIG. 1 there is shown a rolling mill stand 10 including a top work roll 12, a bottom work roll 14, a top backup roll 16 and a bottom back-up roll 18.
  • a workpiece 20 is passed through and between the work rolls 12 and 14 in a direction from the left toward the right as viewed in FIG. 1.
  • the rolling mill stand 10 includes a frame 22 and a force sensing transducer 24 mounted between the frame 22 and the chock 26 operative with the top work roll 12 and the top back-up roll 16.
  • a similar force transducer 28 is mounted between the frame 22 and the chock 3th for the bottom work roll 14 and the bottom back-up roll 18.
  • the provided roll force sensing transducers 24 and 28 will sense and measure the horizontal forces applied between the respective back-up rolls 16 and 18 and the stand frame 22 and will measure the net strip tension force.
  • This net strip tension force includes the horizontal component of the roll force at the roll bite and indicated by the arrow 32 plus the force due to forward tension and indicated by the arrow 34 minus the force due to back tension and indicated by the arrow 36.
  • the actual roll force at the roll bite is illustrated by the arrow 38, and it has a horizontal component illustrated by the 3 arrow 32 and a vertical component shown by the arrow 40.
  • FIG. 2 the work rolls 12 and 14 for the stand N are shown operative with the strip 20.
  • the force sensing transducers 24 and 28 are shown operative in a diagrammatic manner with the respective work rolls 12 and 14 and provide a net inter-stand tension force signal to the tension control apparatus 50 in accordance with the net actual tension in the strip workpiece 20 between the stand N and the succeeding stand N+1.
  • Similar force sensing transducers are provided for each of the illustrated stands N-2, N-l, N, and N+1 and respectively provide net inter-stand tension signals between the respective stands N1 and N2, N1 and N, N and N+1, and finally if desired between the stand N+1 and the wind-up reel 52.
  • the tension control apparatus 50 is operative to provide error correction signals to the respective drive motors, or provided screwdown devices if desired, for the illustrated stands operative with the strip workpiece 20.
  • a reference tension signal source for each of the inter-stand tensions, and a signal comparison device to provide the required tension error signal therefrom.
  • the force signal from the transducers 24 and 28 includes only the horizontal component of the roll force as shown by the force arrow 32 in FIG. 1 and the force due to the back tension between the stand N and stand N-l as shown by the arrow 36 in FIG. 1.
  • This signal V is proportional to the actual inter-stand strip tension as long as the horizontal component of the roll force at the roll bite remains substantially constant. It should be noted that this horizontal component of the roll force may change slightly due to temperature changes in the strip workpiece or slight changes in input thickness of the strip workpiece supplied to stand N, however the net effect would be a change in a direction to maintain the output strip shape and gauge substantially constant relative to stand N.
  • a second signal comparison circuit is provided to compare a desired or reference inter-stand tension in accordance with a signal V provided from a tension reference circuit 72 and the output signal V from the signal summing circuit 68.
  • a tension reference circuit 72 is manually adjustable and permits the operator to set a voltage signal V proportional to the desired tension in the strip workpiece between the stand N and the stand N+1.
  • a tension sensing device 91 in the form of a conventional tensiometer can be momentarily employed to measure the force due to the forward tension in the strip workpiece 20 and a similar tension sensing device 92 can be momentarily employed to measure the opposing force due to back tension.
  • the force F bears a definite relationship to the vertical component F and is influenced by the roll radius as well as the incoming and outgoing thicknesses for a particular stand.
  • control apparatus similar to that shown in FIG. 3 and including a signal comparison circuit 70' may be operative with the tension reference circuit 72 for providing a tension error signal relative to the strip workpiece extending between the particular stand as shown in FIG. 4 and the next adjacent stand.
  • V F F tan This can readily be established by the trigonometric relationship between the horizontal and vertical components of the roll force shown by the arrow 38.
  • the gate circuit 64 is controlled by load signals which may be in the form of load relay signals or a signal from one of the force sensing transducers of the given rolling mill stand.
  • the gate circuit 64 is closed when the strip workpiece head end reaches the next succeeding rolling mill stand, to cause the signal integrator 66 to now hold the output signal V for the duration of the passage of the remainder of the particular strip workpiece.
  • the signal comparison circuit 68 is operative to provide a difference signal Vat in accordance with the respective forces provided between the frame 22 of the rolling mill stand and the back-up rolls 16 and 18 for a first operation when the strip workpiece does not extend to the next succeeding stand and for a second operation when the strip workpiece does extend to the next succeeding stand, such that a net actual forward tension output signal V is supplied by the signal comparison circuit 68 in accordance with the actual forward tension in the strip workpiece 20.
  • the signal comparison circuit 70 is operative to provide a tension error signal V in accordance with a desired forward tension in the strip workpiece 20 relative to the stand N and the actual forward tension in the strip workpiece relative to the stand N. Any tension difference is manifested by the error signal V supplied by the signal comparison circuit 70 shown in FIG.
  • strip tension control apparatus for a rolling mill having a first stand and a second stand, with each stand including a frame and having top and bottom rolls between which the strip passes, the combination of force sensing means operative with said first stand and being positioned between said frame and at least one of said rolls of the first stand for providing a control signal that varies in accordance with the force between said frame and said one roll when the strip is passing between the top and bottom rolls of the first stand, signal providing means operative with said first control signal and being responsive to the strip being present between the rolls of the first stand and being responsive to the strip being present between the rolls of the second stand to provide a second control signal in accordance with the difference in said force prior to the strip being between the rolls of the second stand and after the strip is between the rolls of the second stand, and strip tension control means operative with at least one of said stands for controlling in accordance with the second control signal the tension in said strip passing between the first stand and the second stand.
  • control apparatus for a rolling mill having a stand including a frame and two rolls between which a workpiece is passed and having a workpiece tension providing device
  • roll force sensing means positioned between said frame and one of said rolls for providing a control signal proportional to the roll force between said frame and said one roll when the workpiece is passed between said two rolls
  • workpiece parameter control apparatus operative with said stand and being responsive to said control signal for providing a first parameter signal when the workpiece is passing through said stand and not yet operative with the tension providing device and for providing a second parameter signal when the workpiece is passing through said stand and is operative with the tension providing device
  • signal comparison means responsive to each of said first parameter signal and said second parameter signal for providing a tension control signal
  • tension control apparatus operative with at least one of said stand and said tension providing device for controlling the workpiece tension relative to said stand as a function of said tension control signal.
  • control apparatus for a rolling mill having at least a first stand and a second stand, with each stand including a frame and having top and bottom rolls between which a workpiece passes
  • signal providing means operative with said first control signal and being responsive to the workpiece being present between the rolls of the first stand and being responsive to the workpiece being present between the rolls of the second stand to provide a second control signal in accordance with the difference in said predetermined force prior to the workpiece being between the rolls of the second stand and after the workpiece is between the rolls of the second stand
  • rolling mill operation control means operative with at least one of said stands for controlling in accordance with the second control signal the passing of said workpiece between the rolls of said one stand.
  • control apparatus for a rolling mill having a stand including a frame and two rolls between which a workpiece is passed and having a workpiece passage controlling device
  • roll force sensing means positioned between said frame and one of said rolls for providing a control signal proportional to a predetermined roll force between said frame and said one roll when the workpiece is passed between said two rolls
  • workpiece parameter signal means operative with said stand and being responsive to said control signal for providing a first parameter signal when the workpiece is passing through said stand and not yet operative with the workpiece controlling device and for providing a second parameter signal when the workpiece is passing through said stand and is operative with the workpiece passage controlling device
  • signal comparison means responsive to each of said first parameter signal and said second parameter signal for providing a tension control signal
  • tension control means for controlling the workpiece tension relative to said stand as a function of said tension control signal.
  • control apparatus for a rolling mill having a stand including a frame and a pair of rolls between which a workpiece is passed and having a workpiece tension providing device
  • force sensing means operative with said stand for providing a control signal proportional to a predetermined force relative to said stand when the workpiece is passed between said pair of rolls
  • workpiece parameter control apparatus operative with said stand and being responsive to said control signal for providing a first force component signal when the workpiece is passing through said stand and not yet operative with the tension providing device and for providing a second force component signal when the workpiece is passing through said stand and is operative with the ten sion providing device
  • signal comparison means responsive to each of said first force component signal and said sec- 8 0nd force component signal for providing an operation control signal
  • rolling mill control apparatus operative with at least one of said stand and said tension providing device for controlling the passage of the workpiece relative to said stand as a function of said operaation control signal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US346270A 1964-02-20 1964-02-20 Rolling mill control apparatus Expired - Lifetime US3290912A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US346270A US3290912A (en) 1964-02-20 1964-02-20 Rolling mill control apparatus
GB4223/65A GB1072866A (en) 1964-02-20 1965-02-01 Rolling mill control apparatus
BE660010A BE660010A (xx) 1964-02-20 1965-02-19

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397566A (en) * 1965-10-22 1968-08-20 Inland Steel Co Method for providing metallic strip of uniform thickness and flatness
US3457747A (en) * 1965-12-28 1969-07-29 British Iron Steel Research Rolling mills
JPS49127848A (xx) * 1973-04-11 1974-12-06
DE2713053A1 (de) * 1976-03-26 1977-09-29 Sumitomo Metal Ind Verfahren zum regeln der spannung zwischen den walzgeruesten in einer walzstrasse
DE2650709A1 (de) * 1976-11-05 1978-05-11 Sumitomo Metal Ind Walzwerk
US4167105A (en) * 1976-09-29 1979-09-11 Dominion Engineering Works Limited Tandem mill drive control system
AT385436B (de) * 1982-06-03 1988-03-25 Kocks Technik Walzwerksanlage mit einem planetenschraegwalzwerk
EP1498194A1 (de) * 2002-03-22 2005-01-19 "SLOT", Ltd. Verfahren zur einstellung des geschwindigkeitsmodus für eine kontinuierliche warmwalzstrasse mit mindestspannung in dem raum zwischen walzgerüsten
US20060230799A1 (en) * 2003-03-20 2006-10-19 Shigeru Ogawa Method and apparatus for rolling metalic plate material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1988930A (en) * 1931-03-06 1935-01-22 Gen Electric Cold strip rolling mill
US3018676A (en) * 1956-12-31 1962-01-30 Natalis H Polakowski Apparatus for rolling strip metal
US3188841A (en) * 1962-03-16 1965-06-15 Westinghouse Electric Corp Multistand sampling tension regulating system
US3194036A (en) * 1958-01-02 1965-07-13 Westinghouse Canada Ltd Material thickness control apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1988930A (en) * 1931-03-06 1935-01-22 Gen Electric Cold strip rolling mill
US3018676A (en) * 1956-12-31 1962-01-30 Natalis H Polakowski Apparatus for rolling strip metal
US3194036A (en) * 1958-01-02 1965-07-13 Westinghouse Canada Ltd Material thickness control apparatus
US3188841A (en) * 1962-03-16 1965-06-15 Westinghouse Electric Corp Multistand sampling tension regulating system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397566A (en) * 1965-10-22 1968-08-20 Inland Steel Co Method for providing metallic strip of uniform thickness and flatness
US3457747A (en) * 1965-12-28 1969-07-29 British Iron Steel Research Rolling mills
JPS49127848A (xx) * 1973-04-11 1974-12-06
DE2713053A1 (de) * 1976-03-26 1977-09-29 Sumitomo Metal Ind Verfahren zum regeln der spannung zwischen den walzgeruesten in einer walzstrasse
US4089196A (en) * 1976-03-26 1978-05-16 Sumitomo Metal Industries, Ltd. Method of controlling inter-stand tension in rolling mills
US4167105A (en) * 1976-09-29 1979-09-11 Dominion Engineering Works Limited Tandem mill drive control system
DE2650709A1 (de) * 1976-11-05 1978-05-11 Sumitomo Metal Ind Walzwerk
AT385436B (de) * 1982-06-03 1988-03-25 Kocks Technik Walzwerksanlage mit einem planetenschraegwalzwerk
EP1498194A1 (de) * 2002-03-22 2005-01-19 "SLOT", Ltd. Verfahren zur einstellung des geschwindigkeitsmodus für eine kontinuierliche warmwalzstrasse mit mindestspannung in dem raum zwischen walzgerüsten
EP1498194A4 (de) * 2002-03-22 2007-03-14 Slot Ltd Verfahren zur einstellung des geschwindigkeitsmodus für eine kontinuierliche warmwalzstrasse mit mindestspannung in dem raum zwischen walzgerüsten
US20060230799A1 (en) * 2003-03-20 2006-10-19 Shigeru Ogawa Method and apparatus for rolling metalic plate material
US7310982B2 (en) * 2003-03-20 2007-12-25 Nippon Steel Corporation Rolling method and rolling apparatus for flat-rolled metal materials

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GB1072866A (en) 1967-06-21
BE660010A (xx) 1965-06-16

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