US3421708A - Control of strip - Google Patents

Control of strip Download PDF

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Publication number
US3421708A
US3421708A US582094A US3421708DA US3421708A US 3421708 A US3421708 A US 3421708A US 582094 A US582094 A US 582094A US 3421708D A US3421708D A US 3421708DA US 3421708 A US3421708 A US 3421708A
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Prior art keywords
strip
coil
pay
deceleration
speed
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Expired - Lifetime
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US582094A
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George Galloway Nicholson
Ronald Jackman
Derek Stubbins
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Davy Loewy Ltd
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Davy Loewy Ltd
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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
    • B21B37/46—Roll speed or drive motor control
    • 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
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/003—Regulation of tension or speed; Braking
    • 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
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/34—Feeding or guiding devices not specially adapted to a particular type of apparatus

Definitions

  • the invention provides control means which automatically initiate deceleration of the drive means so that at the end of the deceleration period the end of the strip material is at a predetermined position relative to the pay-ofi device.
  • This invention relates to the control of strip material drawn from a coil on a pay-01f device.
  • strip material is drawn from a coil on a pay-oil device by driving means, for example, a rolling mill, it is difiicult for an operator to know at what moment to initiate deceleration of the driving means since the strip thickness and speed will vary from coil to coil.
  • driving means for example, a rolling mill
  • the invention provides apparatus for controlling strip material, comprising a strip pay-off device associated with driving means for drawing strip there from, comprising means for obtaining a continuous signal proportional to the size of the coil on the pay-oft device, and means responsive to this signal for initiating deceleration of the drive means at a predetermined rate.
  • the invention comprises apparatus for control of strip material, comprising a pay-oil device associated with driving means for drawing material therefrom, means for obtaining a continuous measure of the radius of a coil on the pay-oil device and means responsive to said latter means for initiating deceleration of the strip driving means at a predetermined rate, such that at the end of the deceleration period the end of the strip material has just left the pay-off device.
  • the invention further provides a method of controlling strip material drawn from a coil on a pay-ofl? device which comprises obtaining a continuous measure of the size of the coil and using the measure to initiate deceleration of the strip driving means at a predetermined rate.
  • the radius of the coil can be measured by an arm and roller resting on the coil or can be calculated from a measure of the rotational speed of the pay-01f device and the strip speed.
  • the annulus area of the strip is 1r(r lr) If the length of the strip material wound on the pay-off ice device is L and the thickness is h, then the annulus area is Lh.
  • Equation A rx (B) where rx is the coil radius at which the deceleration should be initiated. If the strip speed V and the thickness h are known then rx can be calculated and deceleration arranged to be initiated automatically when the coil radius reaches rx.
  • a coil 12 having an inner radius r and an outer radius r is mounted on a strip pay-oif device 13.
  • Strip from the pay-oif device passes between the rolls 14 of a rolling mill driven by a motor M and onto a coiler 15.
  • the strip is engaged by a billy roll 16 connected with a DC.
  • tachometer 17 which gives out a signal on line 18 proportional to the linear speed V of the strip.
  • a small roller 20 carried on an arm 21 is urged by a spring 22 into continuous contact with the outer surface of the coil 12 the arm 21 is toothed and engages with a toothed wheel 23 which through arm 24, gears 25 and arm 26 operate a radius measuring potentiometer 27 which emits a signal on line 28 proportional to the radius r.
  • the signal on line 28 is fed to a squaring circuit 30 which emits a signal proportional to r on line 31 to a summing amplifier 32.
  • the signal on line 18 is fed to a squaring circuit 33 which emits a signal on line 34 proportional to V this signal, together with a signal on line 35 representing the predetermined deceleration f and a signal on line 36 representing the strip thickness h are fed to a plurality of decade switches 37 from which is emitted on line 38 a signal proportional to -V h/21rf; the latter signal is also fed to the summing amplifier 32 which passes a signal on line 39 proportional to to a level switch 40 also receiving a signal on line 41 proportional to r the level switch 40 is arranged to emit a signal on line 42 when V h 2 2 7 21rf 7' signal on line 42 passes via a mill stop relay 43 to the motor M to initiate deceleration at the predetermined rate.
  • the coil radius r at any time is given by the relation V/21rN where N is the rotational speed of the pay-ofi device, so that a measure of r may alternatively be obtained by measuring V and N .and calculating r.
  • the value of It may alternatively be measured by a flying micrometer, an isotope gauge or calculated from the reduction in coil radius per revolution of the pay-off device or a relationship between rate of change of coil diameter or pay-oil speed and strip speed.
  • Apparatus for controlling strip material comprising a pay-off device for supporting a coil of strip, drive means for drawing strip from a coil on said payoff device, and control means for controlling said drive means comprising, size measuring means for continuously deriving an electrical signal proportional to the size of the coil on the pay-off device, speed measuring means for continuously deriving an electrical signal proportional to the linear speed of the strip material, and deceleration means responsive to these signals for initiating deceleration of said drive means at a predetermined rate and for a predetermined period so that at the end of the deceleration period the end of the strip material is at a predetermined position relative to the pay-T1 device.
  • a rolling mill having a pair of rolls for drawing strip from the pay-off device and an electric motor for rotating said rolls
  • control means for controlling said motor comprising;
  • Apparatus for controlling strip material comprising, a pay-off device for supporting a coil of strip, drive means for drawing strip from a coil on said payoif device and control means for controlling said drive means comprising, size measuring means for continuously deriving an electrical signal proportional to the square of the outer radius of the coil on the pay-ofi device (r speed measuring means for continuously deriving an electrical signa1 proportional to the square of the linear speed of the strip (v means for deriving an electrical signal proportional to a predetermined deceleration rate of the drive means (f),

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Description

United States Patent 3,421,708 CONTROL OF STRIP George Galloway Nicholson, Ronald Jackman and Derek Stubbias, Sheilield, England, assignors to Davy and United Engineering Company Limited, Sheflield,
England Filed Sept. 26, 1966, Ser. No. 582,094
US. Cl. 242-57 4 Cl Int. Cl. B6511 25/04 ABSTRACT OF THE DISCLOSURE When drawing strip material from a coil on a pay-01f device by drive means it is desirable that the end of the coil be drawn oil? of the pay-off device at a very low speed and as it is also desirable for the remainder of the coil to be drawn off of the pay-oif device at as high a speed as possible, it is necessary to initiate deceleration of the drive means at a particular instant of time which will cause the drive means to be decelerated to zero just as the end of the coil is leaving the pay-ofi device. It is diflicult for an operator to know at what moment to initiate deceleration of' the drive means since the time at which initiation of the deceleration is started depends upon a number of features including the linear speed of withdrawal of the strip. The invention provides control means which automatically initiate deceleration of the drive means so that at the end of the deceleration period the end of the strip material is at a predetermined position relative to the pay-ofi device.
This invention relates to the control of strip material drawn from a coil on a pay-01f device.
When strip material is drawn from a coil on a pay-oil device by driving means, for example, a rolling mill, it is difiicult for an operator to know at what moment to initiate deceleration of the driving means since the strip thickness and speed will vary from coil to coil.
In one aspect the invention provides apparatus for controlling strip material, comprising a strip pay-off device associated with driving means for drawing strip there from, comprising means for obtaining a continuous signal proportional to the size of the coil on the pay-oft device, and means responsive to this signal for initiating deceleration of the drive means at a predetermined rate.
In another aspect the invention comprises apparatus for control of strip material, comprising a pay-oil device associated with driving means for drawing material therefrom, means for obtaining a continuous measure of the radius of a coil on the pay-oil device and means responsive to said latter means for initiating deceleration of the strip driving means at a predetermined rate, such that at the end of the deceleration period the end of the strip material has just left the pay-off device.
The invention further provides a method of controlling strip material drawn from a coil on a pay-ofl? device which comprises obtaining a continuous measure of the size of the coil and using the measure to initiate deceleration of the strip driving means at a predetermined rate.
The radius of the coil can be measured by an arm and roller resting on the coil or can be calculated from a measure of the rotational speed of the pay-01f device and the strip speed.
If the radius of the coil wound on the pay-olf device of radius r is r, then the annulus area of the strip is 1r(r lr If the length of the strip material wound on the pay-off ice device is L and the thickness is h, then the annulus area is Lh.
..r- 1' T (A) If the linear strip speed is V and the deceleration rate is f, the deceleration time to zero strip speed is V/f at an average speed of V/ thus the length of strip leaving the coil from start of deceleration to zero speed is V /2f.
If at the completion of deceleration the end of the strip material has just left the pay-oil? device the length Lx of coil on the reel at initiation of deceleration is Lx: V /2F.
Substituting this in Equation A, we get rx (B) where rx is the coil radius at which the deceleration should be initiated. If the strip speed V and the thickness h are known then rx can be calculated and deceleration arranged to be initiated automatically when the coil radius reaches rx.
One embodiment of apparatus for control of a strip pay-off device, in accordance with the invention, will now be described by way of example only, with reference to the accompanying diagrammatic drawing. A coil 12 having an inner radius r and an outer radius r is mounted on a strip pay-oif device 13. Strip from the pay-oif device passes between the rolls 14 of a rolling mill driven by a motor M and onto a coiler 15. The strip is engaged by a billy roll 16 connected with a DC. tachometer 17 which gives out a signal on line 18 proportional to the linear speed V of the strip. A small roller 20 carried on an arm 21 is urged by a spring 22 into continuous contact with the outer surface of the coil 12 the arm 21 is toothed and engages with a toothed wheel 23 which through arm 24, gears 25 and arm 26 operate a radius measuring potentiometer 27 which emits a signal on line 28 proportional to the radius r. The signal on line 28 is fed to a squaring circuit 30 which emits a signal proportional to r on line 31 to a summing amplifier 32. The signal on line 18 is fed to a squaring circuit 33 which emits a signal on line 34 proportional to V this signal, together with a signal on line 35 representing the predetermined deceleration f and a signal on line 36 representing the strip thickness h are fed to a plurality of decade switches 37 from which is emitted on line 38 a signal proportional to -V h/21rf; the latter signal is also fed to the summing amplifier 32 which passes a signal on line 39 proportional to to a level switch 40 also receiving a signal on line 41 proportional to r the level switch 40 is arranged to emit a signal on line 42 when V h 2 2 7 21rf 7' signal on line 42 passes via a mill stop relay 43 to the motor M to initiate deceleration at the predetermined rate.
The coil radius r at any time is given by the relation V/21rN where N is the rotational speed of the pay-ofi device, so that a measure of r may alternatively be obtained by measuring V and N .and calculating r.
3 The value of It may alternatively be measured by a flying micrometer, an isotope gauge or calculated from the reduction in coil radius per revolution of the pay-off device or a relationship between rate of change of coil diameter or pay-oil speed and strip speed.
We claim: 1. Apparatus for controlling strip material comprisa pay-off device for supporting a coil of strip, drive means for drawing strip from a coil on said payoff device, and control means for controlling said drive means comprising, size measuring means for continuously deriving an electrical signal proportional to the size of the coil on the pay-off device, speed measuring means for continuously deriving an electrical signal proportional to the linear speed of the strip material, and deceleration means responsive to these signals for initiating deceleration of said drive means at a predetermined rate and for a predetermined period so that at the end of the deceleration period the end of the strip material is at a predetermined position relative to the pay-T1 device. 2. In combination with apay-off device for supporting a coil of metallic strip material, a rolling mill having a pair of rolls for drawing strip from the pay-off device and an electric motor for rotating said rolls, control means for controlling said motor comprising;
size measuring means for continuously deriving an electrical signal proportional to the radius of a coil on said pay-off device, speed measuring means for continuously deriving an electrical signal proportional to the linear speed of the strip material, and deceleration means responsive to these signals 'for initiating deceleration of said motor at a predetermined rate and for a predetermined period such that at the end of the deceleration period the end of the strip material has just left the pay-off device. 3. Apparatus for controlling strip material comprising, a pay-off device for supporting a coil of strip, drive means for drawing strip from a coil on said payoif device and control means for controlling said drive means comprising, size measuring means for continuously deriving an electrical signal proportional to the square of the outer radius of the coil on the pay-ofi device (r speed measuring means for continuously deriving an electrical signa1 proportional to the square of the linear speed of the strip (v means for deriving an electrical signal proportional to a predetermined deceleration rate of the drive means (f),
means for deriving an electrical signal proportional to the thickness of the strip (h),
means arranged to receive said signals and combine said signals to obtain a further signal proportional to means for deriving an electrical signal proportional to the square of the radius of the inner surface of the coil (r and means arranged to receive said further signal and said signal proportional to r and to compare said signals to initiate deceleration of said drive means when References Cited UNITED STATES PATENTS 2,991,950 7/1961 Axon et a1 24255. 14 3,115,314 12/1963 Manley et al 242--57 3,297,266 1/1967 Rumple 242-55.12 3,318,545 5/1967 Tobey 24255.125 3,319,901 5/1967 Kurth 242-55.125
ANDRES H. NIELSEN, Primary Examiner.
US. Cl. X.R.
US582094A 1966-09-26 1966-09-26 Control of strip Expired - Lifetime US3421708A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518857A (en) * 1967-09-28 1970-07-07 Westinghouse Electric Corp Rolling mill automatic slowdown control
FR2305796A1 (en) * 1975-03-27 1976-10-22 Westinghouse Electric Corp ANALOGUE AUTOMATIC SLOWING SYSTEM
FR2427854A1 (en) * 1978-06-07 1980-01-04 Bindernagel Ali ROLLER TRAIN FOR THE MANUFACTURE OF METAL WIRES
US4438889A (en) * 1981-01-17 1984-03-27 Jagenberg Werke Ag System for decelerating the drive of a web-winding apparatus
US4463913A (en) * 1981-07-02 1984-08-07 Mitsubishi Denki Kabushiki Kaisha System and apparatus for controlling the unwinding of coiled material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991950A (en) * 1959-06-01 1961-07-11 Clevite Corp Reeling apparatus
US3115314A (en) * 1961-02-01 1963-12-24 Litton Systems Inc Tape handling apparatus
US3297266A (en) * 1963-01-11 1967-01-10 Ampex Speed control system
US3318545A (en) * 1963-11-14 1967-05-09 Ampex Web transport system
US3319901A (en) * 1963-04-17 1967-05-16 Ampex Loop control system for tape transports

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991950A (en) * 1959-06-01 1961-07-11 Clevite Corp Reeling apparatus
US3115314A (en) * 1961-02-01 1963-12-24 Litton Systems Inc Tape handling apparatus
US3297266A (en) * 1963-01-11 1967-01-10 Ampex Speed control system
US3319901A (en) * 1963-04-17 1967-05-16 Ampex Loop control system for tape transports
US3318545A (en) * 1963-11-14 1967-05-09 Ampex Web transport system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518857A (en) * 1967-09-28 1970-07-07 Westinghouse Electric Corp Rolling mill automatic slowdown control
FR2305796A1 (en) * 1975-03-27 1976-10-22 Westinghouse Electric Corp ANALOGUE AUTOMATIC SLOWING SYSTEM
FR2427854A1 (en) * 1978-06-07 1980-01-04 Bindernagel Ali ROLLER TRAIN FOR THE MANUFACTURE OF METAL WIRES
US4438889A (en) * 1981-01-17 1984-03-27 Jagenberg Werke Ag System for decelerating the drive of a web-winding apparatus
US4463913A (en) * 1981-07-02 1984-08-07 Mitsubishi Denki Kabushiki Kaisha System and apparatus for controlling the unwinding of coiled material

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