US2680976A - Production of sheet and strip material - Google Patents

Production of sheet and strip material Download PDF

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Publication number
US2680976A
US2680976A US189406A US18940650A US2680976A US 2680976 A US2680976 A US 2680976A US 189406 A US189406 A US 189406A US 18940650 A US18940650 A US 18940650A US 2680976 A US2680976 A US 2680976A
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United States
Prior art keywords
thickness
tension
strip
separating force
sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US189406A
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English (en)
Inventor
Wilfrid C F Hessenberg
Raymond B Sims
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Iron and Steel Research Association BISRA
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British Iron and Steel Research Association BISRA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of US2680976A publication Critical patent/US2680976A/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
    • B21B37/16—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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product

Definitions

  • the present invention relates to the production of material in the form of sheet or strip either by rolling or by drawin through dies of. the kmd having opposing die surfaces whose separation is adjustable.
  • the material enterin the reducing member may vary in dimensions and other properties along its length and across its width as the result of previous treatment.
  • these variations cause changes in the thickness of the material leaving the reducing member whilst further changes in thickness may be imposed by variations in the conditions of rolling or drawing.
  • One object of the present invention is to provide a new or improved method of controllin the thickness of the sheet or strip produced so that the outgoing thickness of the material is substantially constant.
  • the method of producin material in the form of sheet or strip either by rolling or by drawing through dies of the kind specified, in which the separating force between the rolls or dies is maintained substantially constant by continuous adjustment of the tension applied to the material.
  • This method depends on the fact that if the separating force varies then the thickness of the material leaving the reducing member will vary similarly, Moreover if tension is applied to the material entering or leaving the reducing member then the separating force will be diminished. Thus by continuously adjusting the tension in the material in such a way as to keep the separating force as nearly as possible constant the thickness of the outgoing material may be substantially uniform. along its length.
  • the apparatus for performing the method of the invention comprises means for applying tension to the material enterin or leaving the work rolls or die, and control means responsive to the separating force between the work rolls or opposing die surfaces, said control means bein adapted to contro1 said tension applying means for adjusting the applied tension to maintain said separating force substantially constant.
  • Figure 3 is a sectional view alon the line IIIIII in Figure 2.
  • Figure 4 is a block schematic of the electrical control system which can be utilised with either embodiment
  • Figure 5 is a similar view to Figure 2 of the die stand of the second embodiment.
  • the rolling mill H3 is generally of conventional form comprising work rolls [5, supported in upper bearing chocks I 5 and lower bearing chocks ll respectively, and roll adjusting screws It.
  • the mill in is, however, modified from conventional form by the interposition of steel cylinders l9 between each checks is and their associated adjusting screws it.
  • a number of electrical resistance strain gauges 2B are secured around the side of the cylinders l9 and electric current from a control box 2! is passed through the gauges 29 via the connecting lead 22.
  • the cylinders 59- act as pressure Sensitive elements as any variation in the pressure applied to them causes a variation in the electric current passing through the gauges 20.
  • the control box 2! contains the electronic equipment shown in the block schematic of Figure 4 and to be described hereafter.
  • the purpose of the control box 25 is to feed a control current over the connecting lead 23 to the reel motor [4 in order to vary its torque.
  • the strip 24 is unwound from reel H and is drawn through the work rolls l5 onto the reel I 2.
  • the reels l I and I2 are driven at such relative speeds that tension is applied to the strip of the two upper bearing leaving the work rolls l5 and the amount of this tension depends upon the torque which the reel motor [4 develops.
  • the roll pass and the tension, that is the torque of the motor 14, are adjusted to give a desired value for the outgoing thickness of the strip. Now any variations thereafter in the separating force between the rolls, which will result in a corresponding variation in the outgoin thickness, causes a change in the electric current passing through the gauges 20.
  • is set so that these variations in the gauge current cause a corresponding variation in the output control current to the motor l4 such that the tension applied to the outgoing strip is varied to restore the separating force to its original value.
  • the tension in the strip is automatically continuously adjusted to maintain the separating force between the rolls as nearly as possible constant thus ensuring that the outgoing strip is of substantially uniform thickness along its length.
  • the electronic equipment may be merely a direct current amplifier for amplifying the current through the gauges to provide an amplified control current which is added to a fixed current, the combined currents being fed to the armature of the reel motor.
  • a circuit such as that shown in Figure 4. In this circuit the current from the gauges is passed through a discriminator which is arranged to give zero output when the roll separating force corresponds to the desired thickness of strip.
  • Fluctuations on either side of this separating force lead to an output whose polarity depends upon whether the separating force is above or below the desired value, and this output is fed to a phase sensitive amplifier 25 and a direct current amplifier 21 whose output is added to a fixed current from a supply 28, the combined currents being fed to the armature 29 of the reel motor M.
  • the cold rolling mill I0 is replaced by the die stand 30 shown in Figure 5, but otherwise the arrangement is similar to that already described.
  • the die stand 30 has separate upper and lower lips 3
  • the lower lip 32 is supported in a holder block 33 which is fixed to the die stand 30, whilst the upper lip 35 is carried in a holder block 34 which is vertically movable in the die stand 30 and can be pressed towards the lower lip 3! by the adjusting screws 35.
  • cylinders 59 carrying strain gauges 20 are interposed between the holder block 34 and each adjusting screw 35. It will be readily understood that the separating force between the opposing die surfaces can be maintained substantially constant by adjustment of the tension applied to the strip in the manner already described for the first embodiment.
  • a thickness reducing member having opposed material engaging surfaces, means for applying tension to the material, means for producing an output signal whose instantaneous magnitude is proportional to the force established between said opposed material engaging surfaces,
  • a supporting stand in which said thickness reducing member is mounted, and a member mounted in said stand, and wherein said means for producing an output signal comprises a stress responsive member interposed between one of said opposed material engaging surfaces and said member mounted in said stand, an electrical resistance strain gauge mounted on said stress responsive member and responsive to variations in the compressive stress applied to said stress responsive member, and mean for applying an electric potential to said strain gauge, the resultant electric current through said strain gauge providing the required output signal.
  • a thickness reducing member having work engaging surfaces adapted to engage opposite sides of the material, a first material storage reel from which said material is drawn, a second material storage reel onto which said material is drawn after passing through said reducing member, means for controlling the torque of at least one of the storage reels for producing a tension in the material passing between the reels, means for generating a control signal whose instantaneous magnitude is proportional to the force established between work engaging surfaces, and means for applying said control signal to the means for controlling the torque of a storage reel, whereby the tension produced in said material is varied to maintain substantially constant the thickness of the material leaving said reducing member.
  • said means for controlling the torque of said one of the storage reels comprises an electric motor to which said signals are applied to develop the required variations in the applied tension.
  • said reducing member comprises a rolling mill, said work engaging surfaces being the work rolls of said mill, and said mill having adjusting members for setting the separation between said work rolls to a desired value.
  • said means for generating a control signal includes a stress responsive member interposed between a work roll and an adjusting member, and electrical means responsive to variations in the stress produced in said stress responsive member for producing said control signal.
  • apparatus for reducing the thickness of material by drawing it through a reducing member having opposed material engaging surfaces means for applying a variable tension to said material, means for generating an electrical signal whose amplitude at any given time is proportional to the separating force existing at that time between said opposed material engaging surfaces, and means energized by said electrical signal to adjust the tension applied to said material by said first mentioned means to maintain said separating force substantially constant.
  • the means for generating an electrical signal proportional to the separating force includes a member engaging one of said material engaging sur faces, said member being stressed in proportion to said separating force, an electrical resistance strain gauge mounted on said member to respond to variations in the stressing of said member, and means for passing an electric current through said strain gauge.
  • a roll stand for reducing the thickness of material, a roll stand, opposed work rolls mounted in said stand, two adjusting members mounted in said stand for adjusting the separation between said work rolls, compressive-stress responsive means interposed between a work roll and each adjusting member, two electrical resistance strain gauges, one strain gauge mounted on each compressive-stress responsive means, means for applying an electric potential to said strain gauges to produce a current through said gauges which varies in proportion to the variations in the force applied to said adjusting members by the work rolls, a first material storage reel from which said material is drawn, a second material storage reel onto which said material is drawn after passing through said Work rolls, means for controlling the torque of at least one of the storage reels for producing a tension in the material passing between the reels, and means for applying said varying current to the means for controlling the torque of a storage reel, whereby the thickness of the material issuing from said work rolls is maintained substantially constant.
  • said means for controlling the torque of said one of the storage reels includes an electric motor to which said varying current is applied to produce the required variations in the applied tension.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
US189406A 1949-10-11 1950-10-10 Production of sheet and strip material Expired - Lifetime US2680976A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB288497X 1949-10-11
GB41050X 1950-10-04

Publications (1)

Publication Number Publication Date
US2680976A true US2680976A (en) 1954-06-15

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ID=26238873

Family Applications (1)

Application Number Title Priority Date Filing Date
US189406A Expired - Lifetime US2680976A (en) 1949-10-11 1950-10-10 Production of sheet and strip material

Country Status (7)

Country Link
US (1) US2680976A (de)
BE (1) BE498632A (de)
CH (1) CH288497A (de)
FR (1) FR1025727A (de)
GB (1) GB681373A (de)
LU (1) LU30361A1 (de)
NL (1) NL78713C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936018A (en) * 1959-08-03 1960-05-10 Reynolds Metals Co Apparatus for straightening metallic extrusions
US3062264A (en) * 1955-07-12 1962-11-06 Reynolds Metals Co Method for straightening metallic extrusions
US3186200A (en) * 1961-10-31 1965-06-01 Gen Electric Automatic thickness regulator for strip rolling mills
US3891026A (en) * 1971-01-07 1975-06-24 Koppers Co Inc Apparatus for bending continuous cast slabs
US4056140A (en) * 1976-10-20 1977-11-01 United States Steel Corporation Method and mechanism for controlling forces in a continuous-casting machine
USRE32048E (en) * 1979-01-11 1985-12-17 Prince Corporation Tie bar adjustment system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE959996C (de) * 1953-09-07 1957-03-14 Sandvikens Jernverks Ab Einrichtung zum Konstanthalten der Staerke des auslaufenden Walzgutes bei Walzwerken
USRE25075E (en) * 1954-01-26 1961-10-31 Rolling mills
BE556915A (de) * 1956-04-23
US3018676A (en) * 1956-12-31 1962-01-30 Natalis H Polakowski Apparatus for rolling strip metal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2099261A (en) * 1934-07-19 1937-11-16 American Sheet & Tin Plate Wide strip cold rolling
GB489915A (en) * 1936-12-18 1938-08-05 British Thomson Houston Co Ltd Improvements in and relating to the automatic control of the thickness of material issuing from rolling mills and the like
US2205213A (en) * 1937-06-09 1940-06-18 Westinghouse Electric & Mfg Co Tension device for wire drawing benches
US2322418A (en) * 1941-03-15 1943-06-22 Sperry Prod Inc Automatic temperature compensation for pressure indicators of continuous rolling mills

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2099261A (en) * 1934-07-19 1937-11-16 American Sheet & Tin Plate Wide strip cold rolling
GB489915A (en) * 1936-12-18 1938-08-05 British Thomson Houston Co Ltd Improvements in and relating to the automatic control of the thickness of material issuing from rolling mills and the like
US2205213A (en) * 1937-06-09 1940-06-18 Westinghouse Electric & Mfg Co Tension device for wire drawing benches
US2322418A (en) * 1941-03-15 1943-06-22 Sperry Prod Inc Automatic temperature compensation for pressure indicators of continuous rolling mills

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062264A (en) * 1955-07-12 1962-11-06 Reynolds Metals Co Method for straightening metallic extrusions
US2936018A (en) * 1959-08-03 1960-05-10 Reynolds Metals Co Apparatus for straightening metallic extrusions
US3186200A (en) * 1961-10-31 1965-06-01 Gen Electric Automatic thickness regulator for strip rolling mills
US3891026A (en) * 1971-01-07 1975-06-24 Koppers Co Inc Apparatus for bending continuous cast slabs
US4056140A (en) * 1976-10-20 1977-11-01 United States Steel Corporation Method and mechanism for controlling forces in a continuous-casting machine
USRE32048E (en) * 1979-01-11 1985-12-17 Prince Corporation Tie bar adjustment system

Also Published As

Publication number Publication date
FR1025727A (fr) 1953-04-20
BE498632A (de)
LU30361A1 (de)
NL78713C (de)
GB681373A (en) 1952-10-22
CH288497A (fr) 1953-01-31

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