US3709009A - Method for detecting eccentricity and phase angle of working or backing roll in rolling mill - Google Patents

Method for detecting eccentricity and phase angle of working or backing roll in rolling mill Download PDF

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Publication number
US3709009A
US3709009A US00083050A US3709009DA US3709009A US 3709009 A US3709009 A US 3709009A US 00083050 A US00083050 A US 00083050A US 3709009D A US3709009D A US 3709009DA US 3709009 A US3709009 A US 3709009A
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Prior art keywords
roll
eccentricity
arithmetic unit
phase
rolling
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Expired - Lifetime
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US00083050A
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English (en)
Inventor
H Shiozaki
N Takahashi
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IHI Corp
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IHI Corp
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    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • 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
    • B21B37/66—Roll eccentricity compensation systems

Definitions

  • the present invention relates to a method for detecting the eccentricity and phase of a roll from the rolling pressure of the roll in a rolling mill without employing a detector directly attaching the peripheral surface of the roll.
  • a working roll in a two-high rolling-mill stand and backing rolls in a four-high rolling-mill stand present the problem of eccentricity.
  • the eccentricity of the working roll or backing rolls will cause the variation in roll gap so that the thickness of the rolled stock varies as a function of rotation of the working or backing roll.
  • the rolling pressure and rotational speed of a working or backing roll are measured,' and the measured rolling pressure is sampled at a suitable time interval, quantized and fed into an arithmetic unit for calculation of the eccentricity and phase of the roll.
  • the eccentricity and phase may be stored in a holding circuit and converted into analog quantities which may be used as the signals for correcting the variation in thickness of the rolled stock due to the eccentricity of the roll.
  • the detection of the eccentricity and phase of a working or backing roll may be made very quickly in a very simple manner so that the variation in thickness of the rolled stock may be immediately corrected.
  • FIGS. 1, 2 and 3 are graphs for explanation of the principle of the method for detecting the eccentricity and phase in accordance with the present invention.
  • FlG.4 is a block diagram illustrating the sequence of calculating the eccentricity of the roll from the measured rolling pressure.
  • Equation l A cos (wt-B) i K M Therefore, it is possible to detect both of A and B by measuring the value of AP during one rotation of backing roll. More particularly, the rolling pressure and the rotational speed of the roll are measured. The measured rolling pressure is sampled at a predetermined time interval, converted into a digital value which may be fed into an arithmetic unit so as to calculate the roll eccentricity and phase. The calculated roll eccentricity and phase may be stored and converted into analog quantities which may be used as signals for correcting the variation in thickness of rolled sheet due to the eccentricity of the working roll.
  • the pressure and rotational speed of a backing roll of the rolling mill stand are first measured.
  • the rolling pressure for example the downward pressure in the machine, can be detected by a conventional method, for example, by means of a load cell installed between the backup roll,chuck and housing.
  • a load cell installed between the backup roll,chuck and housing.
  • the detection of the rotation of the rolls can also be detected by any conventional technique such as providing a pulse transmitter at the end of the axis of a backing roll to generate a pulse for each rotation of the roll over a given angular displacement that the rolling pressure P varies with respect to time t as shown by the curve a in FlG.l.
  • the rolling pressure P is sampled at a time interval of Th1 where T is a time required for the working roll to make one rotation and n is an integer, and then quantized as shown in FIG.2.
  • T is a time required for the working roll to make one rotation
  • n is an integer
  • the mean values of A and B during a number of m rotations of the backing rollers are obtained so as to use them as thesignals representative of the eccentricity of the roll in the next m rotations of the roller.
  • the values of A and [3 in this next m rotations are compared with the former values of A and B and the deviations or differences are added to the former values so as to generate the signals representative of the eccentricity which maybe used in a second m rotations of the roller.
  • the generated signals may be applied in conventional manner to suitable motors for adjusting the roll setting, or to hydraulic roll adjustment devices by way of amplifiers, in order to thus compensate for the effect of roll eccentricity.
  • FlG.4 is a block diagram illustrating the sequence of the above described steps. In case of a two-high rolling-millstand, the values A and B may be obtained from a working roll in a similar manner as described above.
  • a pulse generator 8 for generating pulses responsive to the degree of rotation of a roller.
  • the pulse. outputof the generator 8 is applied to a timing circuit 9 which, responsive to the pulses received from the generator 8, generates time pulsesfor the operation of a sampling circuit to, a memory circuit 4, an arithmetic unit 5 and a holding circuit 6, sothat the timing of the operations of these devices is responsive to the pulse output of the pulse generator 8.
  • the roll pressure load is measured by a rolling pressure measurement detector 1, with the output of the detector being applied to a sampling circuit 2 which samples the signals in accordance with the timing output of the timing circuit 9 as above stated.
  • the output of the sampling circuit is applied to an analog-to-digital converter 3 'to provide a digital output for a memory circuit 4 and an arithmetic unit 5.
  • the memory circuit 4, the output of which is also applied to the arithmetic unit 5, stores the sampled data from the converter 3 while the arithmetic unit 5 is preforming other calculations.
  • the arithmetic unit 5 calculates the value of the eccentricity A of the backing roll and the phase angle [3.
  • the output of the arithmetic unit 5 is applied to a holding circuit 6 which stores the values of eccentricity A and phase angle [3 until they are corrected by the next sampling cycle.
  • the output of the holding circuit 6 is appliedtoa digital-to-analog converter 7 to provide the output signals representative of the roll eccentricity.
  • the values of eccentricity A and phase angle [3 retained by the holding circuit 6 are composed of the values retained by the holding device at the end of a sampling cycle and the newly calculated value of these quantities as received from the arithmetic calculating unit 5.
  • a process for detecting the eccentricity and phase of a roll in a rolling mill comprising measuring the rolling pressure and rotational speed, sampling the measured rolling pressure at a suitable time interval quantizing the sampled rolling pressure, calculating the eccentricity and phase of the roll by feeding the quantized rolling pressure into an arithmetic unit, holding the calculated eccentricity and phase in a holding circuit, converting the eccentricity and/or phase angle of the roll into analog quantities, and using said analog quantities as the signals for correcting the variation in thickness of the rolled sheet due to the eccentricity of the roll.
  • a system .for determining the eccentricity and phase of a roll in a rolling mill comprising means providing a first signal corresponding to the rolling pressure of said roll, means providing a second signal corresponding to the angular velocity of said roll, an arithmetic unit, and means applying said first and second signals to said arithmetic unit, said arithmetic unit comprising means for producing output signals A and B corresponding to said eccentricity and phase respectively from the relationship:
  • AP A cos (wtfl) where AP is the variation in rolling pressure of said roll, K is a mill constant, and M is the plastic deformation coefficient.
  • said means for providing said first signal comprises means for sampling the rolling pressure of said roll at a rate T/n to provide said first signal, where T is the time of one rotation of the roll and n is an integer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
US00083050A 1970-03-20 1970-10-22 Method for detecting eccentricity and phase angle of working or backing roll in rolling mill Expired - Lifetime US3709009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45023105A JPS4937337B1 (ru) 1970-03-20 1970-03-20

Publications (1)

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US3709009A true US3709009A (en) 1973-01-09

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US00083050A Expired - Lifetime US3709009A (en) 1970-03-20 1970-10-22 Method for detecting eccentricity and phase angle of working or backing roll in rolling mill

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US (1) US3709009A (ru)
JP (1) JPS4937337B1 (ru)
DE (1) DE2050402A1 (ru)
FR (1) FR2083856A5 (ru)
GB (1) GB1321116A (ru)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881335A (en) * 1974-03-07 1975-05-06 Westinghouse Electric Corp Roll eccentricity correction system and method
US3882705A (en) * 1974-03-07 1975-05-13 Westinghouse Electric Corp Roll eccentricity correction system and method
US3889504A (en) * 1973-08-22 1975-06-17 Hitachi Ltd Thickness control device for rolling mill
US3893317A (en) * 1973-04-10 1975-07-08 Davy Loewy Ltd Eccentricity correction in a rolling mill
US3920968A (en) * 1973-06-27 1975-11-18 Ishikawajima Harima Heavy Ind System for controlling eccentricity of rolling mill
US3928994A (en) * 1973-10-17 1975-12-30 Hitachi Ltd Thickness control system for a rolling mill
US4038848A (en) * 1974-05-31 1977-08-02 Hitachi, Ltd. Method and apparatus for controlling eccentricity of rolls in rolling mill
US4222254A (en) * 1979-03-12 1980-09-16 Aluminum Company Of America Gauge control using estimate of roll eccentricity
WO1985000998A1 (en) * 1983-09-08 1985-03-14 John Lysaght (Australia) Limited Rolling mill strip thickness controller
US4580224A (en) * 1983-08-10 1986-04-01 E. W. Bliss Company, Inc. Method and system for generating an eccentricity compensation signal for gauge control of position control of a rolling mill
US4850211A (en) * 1986-04-30 1989-07-25 Kabushiki Kaisha Toshiba Method of controlling elimination of roll eccentricity in rolling mill and device for carrying out the method
US4910985A (en) * 1986-07-09 1990-03-27 Alcan International Limited Method and apparatus for the detection and correction of roll eccentricity in rolling mills
DE102007003243A1 (de) 2007-01-23 2008-07-31 Siemens Ag Regelanordnung für ein Walzgerüst und hiermit korrespondierende Gegenstände

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2407430C3 (de) * 1974-02-13 1981-12-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Einrichtung zur Ermittlung der Dicke oder Dickenabweichung eines aus einem Walzgerüst auslaufenden Walzgutes
US4521859A (en) * 1982-10-27 1985-06-04 General Electric Company Method of improved gage control in metal rolling mills
JPS5992113A (ja) * 1982-11-15 1984-05-28 Nisshin Steel Co Ltd ロ−ル偏心制御装置
DE3844202A1 (de) * 1988-12-29 1990-07-05 Asea Brown Boveri Vorrichtung zur regelung der walzenexzentrizitaetskompensation an einem walzgeruest
DE4411313C2 (de) * 1993-05-08 1998-01-15 Daimler Benz Ag Verfahren zur Ausfilterung des Exzentrizitätseinflusses beim Walzen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100410A (en) * 1959-06-27 1963-08-13 Westinghouse Canada Ltd Control systems
US3194035A (en) * 1961-05-08 1965-07-13 Davy And United Instr Ltd System for eliminating cyclic variations in rolling mill gauge errors
CA725389A (en) * 1966-01-11 A. I. Young John Roll eccentricity signal attenuator
US3478551A (en) * 1966-05-06 1969-11-18 Davy & United Instr Ltd Control systems
US3543549A (en) * 1967-11-21 1970-12-01 Davy & United Eng Co Ltd Rolling mill control for compensating for the eccentricity of the rolls
US3580022A (en) * 1968-11-12 1971-05-25 Youngstown Sheet And Tube Co Rolling mill including gauge control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA725389A (en) * 1966-01-11 A. I. Young John Roll eccentricity signal attenuator
US3100410A (en) * 1959-06-27 1963-08-13 Westinghouse Canada Ltd Control systems
US3194035A (en) * 1961-05-08 1965-07-13 Davy And United Instr Ltd System for eliminating cyclic variations in rolling mill gauge errors
US3478551A (en) * 1966-05-06 1969-11-18 Davy & United Instr Ltd Control systems
US3543549A (en) * 1967-11-21 1970-12-01 Davy & United Eng Co Ltd Rolling mill control for compensating for the eccentricity of the rolls
US3580022A (en) * 1968-11-12 1971-05-25 Youngstown Sheet And Tube Co Rolling mill including gauge control

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893317A (en) * 1973-04-10 1975-07-08 Davy Loewy Ltd Eccentricity correction in a rolling mill
US3920968A (en) * 1973-06-27 1975-11-18 Ishikawajima Harima Heavy Ind System for controlling eccentricity of rolling mill
US3889504A (en) * 1973-08-22 1975-06-17 Hitachi Ltd Thickness control device for rolling mill
US3928994A (en) * 1973-10-17 1975-12-30 Hitachi Ltd Thickness control system for a rolling mill
US3881335A (en) * 1974-03-07 1975-05-06 Westinghouse Electric Corp Roll eccentricity correction system and method
US3882705A (en) * 1974-03-07 1975-05-13 Westinghouse Electric Corp Roll eccentricity correction system and method
US4038848A (en) * 1974-05-31 1977-08-02 Hitachi, Ltd. Method and apparatus for controlling eccentricity of rolls in rolling mill
US4222254A (en) * 1979-03-12 1980-09-16 Aluminum Company Of America Gauge control using estimate of roll eccentricity
US4580224A (en) * 1983-08-10 1986-04-01 E. W. Bliss Company, Inc. Method and system for generating an eccentricity compensation signal for gauge control of position control of a rolling mill
WO1985000998A1 (en) * 1983-09-08 1985-03-14 John Lysaght (Australia) Limited Rolling mill strip thickness controller
AU576330B2 (en) * 1983-09-08 1988-08-25 John Lysaght (Australia) Limited Rolling mill strip thickness controller
US4850211A (en) * 1986-04-30 1989-07-25 Kabushiki Kaisha Toshiba Method of controlling elimination of roll eccentricity in rolling mill and device for carrying out the method
US4910985A (en) * 1986-07-09 1990-03-27 Alcan International Limited Method and apparatus for the detection and correction of roll eccentricity in rolling mills
DE102007003243A1 (de) 2007-01-23 2008-07-31 Siemens Ag Regelanordnung für ein Walzgerüst und hiermit korrespondierende Gegenstände

Also Published As

Publication number Publication date
FR2083856A5 (ru) 1971-12-17
GB1321116A (en) 1973-06-20
DE2050402B2 (ru) 1974-04-11
DE2050402A1 (de) 1971-10-07
JPS4937337B1 (ru) 1974-10-08

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