US3750437A - Method and apparatus for controlling continuous tandem rolling mills - Google Patents

Method and apparatus for controlling continuous tandem rolling mills Download PDF

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Publication number
US3750437A
US3750437A US00119220A US3750437DA US3750437A US 3750437 A US3750437 A US 3750437A US 00119220 A US00119220 A US 00119220A US 3750437D A US3750437D A US 3750437DA US 3750437 A US3750437 A US 3750437A
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United States
Prior art keywords
mill
gauge
pulse
strip
rolling
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US00119220A
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English (en)
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S Fujii
M Ishida
M Kamata
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NIPPON KK
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NIPPON KK
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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
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness

Definitions

  • the first mill stand is set to a redetermined rollin schedule when the number [30] Forelgn Application Priority Data of P1588 signals counted as reached a predetermined Mar. 7,1970 Japan 45/19212 value under the assumption that h gauge varying point reaches the first mill stand, at the same time the [52] US. Cl.
  • the gauge in the stepped rolling operation, it is highly desirable to vary the gauge under a high speed operating condition and under a condition to minimize the variation in the strip tension in orderto improve the rolling efficiency and to decrease the risk of breakage of the strip.
  • Another object of this invention is to provide a novel control method and system for a continuous tandem mill capable of varying the gauge of the strip being rolled without causing undue variation in the strip tension, thus preventing breaking of the strip.
  • a further object of this invention to provide an improved method and system for readily varying the gauge of a continuously moving strip by one man contr'ol.
  • a method comprising the steps of commencing the counting operation of a number of pulse signals from a transmitter associated with a deflector roller on the entry side of a plurality of mill stands in response to a signal from a gauge varying point detector which is disposed on the entry side of said plurality of mill stands to detect the passage of said gauge varying point on said strip being rolled, setting the first mill stand to a predetermined rolling schedule when the number of pulse signals counted has reached a predetermined value under the assumption that said gauge varying point reaches said first mill stand, concurrently commencing the counting operation of the number of pulses from a pulse transmitter associated with the roll of said first mill stand, setting the second mill stand to said predetermined rolling schedule when said counted number of pulses from said last mentioned pulse transmitter reaches a predetermined value and repeating similar setting operations for succeeding mill stands until the last mill stand is set
  • a control system of a continuous tandem mill including a plurality of spaced apart mill stands and a deflector roller on the entry side of said mill, said control system comprising a gauge varying point detector disposed to detect a gauge varying point on said strip and for producing a pulse signal, a plurality of pulse counters of a number of equal to the sum of the number of said deflector roller and the number of said mill stands, a plurality of pulse transmitters respectively associated with said deflector roller and the work rolls of said mill stands for applying pulse signals to respective counters, means to supply the output pulse from said gauge varying point detector to one of said counters which receives the output pulse from one of said pulse transmitters which is associated with said deflector roller, means for applying the output of each pre ceding counter to each succeeding counter, a correction computer for presetting a predetermined value of the counted number of the pulse signals in each one of said counters and a schedule set value signal transmitter connected to receive outputs from respective counters for transmit
  • the gauge varying point detector may be a detector which provides a pulse signal in response to the weld seam, whereas if such a point is not a weld seam, the gauge varying point may be preset to correspond to a predetermined length of the strip or a predetermined number of convolutions of the strip unwound from a coil. In the latter case, a signal representing the predetermined length may be produced by a signal transmitter connected to the pay off reel or a deflector roller.
  • a perforation or a notch, or an optical, magnetic or radioactive marking may be provided at the gauge varying point which is detected by a photoelectric detector, width detector, magnetic detector or radiation detector to produce a signal representing the gauge varying point.
  • two or more different type detecting systems may be combined. Further, to back-up the automatic system, a manually operated push button may be used.
  • the length of the strip on the entry side of the first mill stand existing between the gauge varying point and the first stand is assumed to pass therethrough and the schedule set value signal transmitter transmits the set value to the first stand for the next rolling speed for the different gauge.
  • the schedule set value signal transmitter sends the set value regarding the second mill stand during the rolling schedule for the next gauge.
  • the schedule set value signal transmitter transmits the set value regarding the last mill stand during the rolling schedule for the next gauge.
  • Running of the gauge varying point from one stand to the next stand can be determined by counting the pulse signals from a pulse transmitter mounted on the shaft of a roll, the number of pulses corresponding to the number of revolutions of the roll shaft which in turn is a function of the strip length between adjacent mill stands.
  • the number of pulses corresponding to the strip length between adjacent mill stands varies dependent upon the roll diameter and the forward slip, it is necessary to make corrections according to following equation where 1 represents the distance or strip length between adjacent mill stands, R the roll diameter, N the number of pulses generated per one revolution of the roll, f the forward slip and k the number of pulses corresponding to the distance between stands.
  • FIGURE shows a preferred embodiment of the novel control system as applied to a five stand tandem rolling mill installation.
  • a gauge varying point detector 1 provides a start pulse signal to a pulse counter PCl in response to the passage of the gauge varying point.
  • Pulse transmitter 9 mounted on a deflector roller 2 on the entry side of the mill stands and pulse transmitters -13 are mounted on the operating shafts of the working rolls of respective mill stands 3 to 7 inclusive to supply pulses to pulse counters PC1, PC2, PCS, PC4 and PCS respectively corresponding to the numbers of revolutions of the deflector roller and the working rolls.
  • a value expressed by k I, N,/ 1rRd calculated, for example, by a correction computer 19 is preset in counter PCl, where 1, represents the distance between gauge varying point detector 1 and the first stand 3, N the number of pulses per one revolution of deflector roller 2 and Rd the diameter of the deflector roller.
  • the gauge varying point of the strip is at least one of weld seam between sections of the strips, a perforation, a notch, an optical marking, a magnetic marking or radiation marking. Such perforation, notch or markings are preferably on the edge of the strip.
  • a value expressed by k 1,, N,,/1rR, (l +f,,) is also preset in each one of counters PCZ to PCS by the correction computer, where In represents the distance be tween adjacent mill stands, Nn the number of pulses per one revolution of the working roll. Rn the diameter thereof and fn the forward slip.
  • each counter PCl PCS Upon receipt of a respective count commencement command signal, each counter PCl PCS starts to count the pulse signals from its associated pulse transmitter PT, PT,,, respectively, and when the counter counts up a predetermined number of pulses preset by the correction computer, there is provided an output signal.
  • counter PCl starts its counting operation in response to the start output pulse from the gauge varying point detector 2, counters PC2, PC3, PC4 and PCS are started by the start outputs from preceding counters, which start outputs'are generated when said preceding counters count up preset numbers of pulses.
  • a schedule set value signal transmitter 20 in which are preset schedules of respective mill stands for the next gauge by an independent controlling computer or a manual switch, not shown, and these preset schedules are sent to control apparatus for respective mill stands in response to the outputs from respective counters.
  • a method of controlling gauge comprising a steps of commencing counting of pulse signals emitted from a pulse transmitter associated with a deflector roller on the entry side of a plurality of mill stands in response to a signal from a gauge varying point detector which is disposed on the entry side of said plurality of mill stands to detect the passage of said gauge varying point on said strip being rolled, setting a first mill stand to a predetermined rolling schedule when the number of pulse signals counted has reached a predetermined value corresponding to when that said gauge varying point reaches said first mill stand, concurrently commencing counting of pulses from a pulse transmitter associated with a roll of said first mill stand, setting a second mill stand to said predetermined rolling schedule when the counted number of pulse signals from said last mentioned pulse transmitter reaches a predetermined value and repeating similar setting operations for succeeding mill stands until the last mill stand is set to said predetermined rolling schedule.
  • said predetermined values are preset in each one of counters respectively associated with said deflector roller and the working rolls of said respective mill stands.
  • gauge control method is at least one of the following a weld seam between sections of said strip, a perforation, a notch, an optical marking, a magnetic marking and radiation marking which are formed on said strip.
  • a control system of a continuous tandem rolling mill includinga plurality of spaced apart mill stands and a deflector roller means on the entry side of said mill, said control system comprising a gauge varying point detector disposed to detect a gauge varying point on said strip for producing a pulse signal to commence a counting operation, a plurality of pulse counters of number equal to the number of said mill stands, a plurality of pulse transmitters respectively associated with said deflector roller means and the work rolls of said mill stands except for the last mill stand, one of said pulse counters receiving the output pulses from one of said pulse transmitters which is associated with said deflector roller means and for counting the output pulses from said one pulse transmitter after receipt of the pulse signal from said gauge varying point detector, means for applying the output of each preceding counter to each succeeding counter corresponding to successive mill stands, a correction means for presetting a predetermined value corresponding to the number of pulse signals to be counted in each one of said counters, and a schedule set value signal transmitter connected to receive outputs from respective counters for transmitting
  • correction means comprises a correction comp uter.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US00119220A 1970-03-07 1971-02-26 Method and apparatus for controlling continuous tandem rolling mills Expired - Lifetime US3750437A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45019212A JPS4817146B1 (ja) 1970-03-07 1970-03-07

Publications (1)

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US3750437A true US3750437A (en) 1973-08-07

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US00119220A Expired - Lifetime US3750437A (en) 1970-03-07 1971-02-26 Method and apparatus for controlling continuous tandem rolling mills

Country Status (6)

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US (1) US3750437A (ja)
JP (1) JPS4817146B1 (ja)
DE (1) DE2110539C3 (ja)
ES (1) ES389002A1 (ja)
FR (1) FR2081773B1 (ja)
GB (1) GB1304809A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852983A (en) * 1973-04-25 1974-12-10 Westinghouse Electric Corp Work strip gauge change during rolling in a tandem rolling mill
USB341579I5 (ja) * 1972-03-28 1975-01-28
US4887343A (en) * 1987-05-29 1989-12-19 Fuji Photo Film Co., Ltd. Method and apparatus for roller leveler
US6526793B1 (en) * 2000-10-25 2003-03-04 Donald M. Danko Magnetic marking and positioning system for unfinished metal bars

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011743A (en) * 1976-04-20 1977-03-15 Westinghouse Electric Corporation Stand speed reference circuit for a continuous tandem rolling mill
JPS5467550A (en) * 1977-11-09 1979-05-31 Mitsubishi Electric Corp Shape control of rolled material
JPS6378856U (ja) * 1986-11-10 1988-05-25

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3109966A (en) * 1958-06-19 1963-11-05 Armco Steel Corp Signal impulse integrator with variable time delay
US3564882A (en) * 1968-04-22 1971-02-23 Allegheny Ludlum Steel Rolling mill control system
US3603124A (en) * 1968-05-09 1971-09-07 Nippon Kokan Kk Computer control system for rolling metal strips using feed-forward and prediction

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE621475A (ja) * 1961-08-29
FR1338835A (fr) * 1961-11-13 1963-09-27 Verwaltungs Ges Moeller & Neum Dispositif pour la mise en circuit périodique d'une cisaille pour découper un produit laminé en mouvement
BE637694A (ja) * 1962-09-21
CH439825A (fr) * 1965-12-23 1967-07-15 Velectra S A Dispositif d'avance par pas d'une bande de matière présentant des perforations

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3109966A (en) * 1958-06-19 1963-11-05 Armco Steel Corp Signal impulse integrator with variable time delay
US3564882A (en) * 1968-04-22 1971-02-23 Allegheny Ludlum Steel Rolling mill control system
US3603124A (en) * 1968-05-09 1971-09-07 Nippon Kokan Kk Computer control system for rolling metal strips using feed-forward and prediction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB341579I5 (ja) * 1972-03-28 1975-01-28
US3913363A (en) * 1972-03-28 1975-10-21 Nippon Kokan Kk Method and apparatus for shape control of metal products in continuous rolling mill
US3852983A (en) * 1973-04-25 1974-12-10 Westinghouse Electric Corp Work strip gauge change during rolling in a tandem rolling mill
US4887343A (en) * 1987-05-29 1989-12-19 Fuji Photo Film Co., Ltd. Method and apparatus for roller leveler
US6526793B1 (en) * 2000-10-25 2003-03-04 Donald M. Danko Magnetic marking and positioning system for unfinished metal bars

Also Published As

Publication number Publication date
DE2110539C3 (de) 1980-02-14
DE2110539A1 (de) 1971-10-07
ES389002A1 (es) 1974-02-16
FR2081773B1 (ja) 1974-02-22
GB1304809A (ja) 1973-01-31
JPS4817146B1 (ja) 1973-05-26
DE2110539B2 (de) 1979-06-21
FR2081773A1 (ja) 1971-12-10

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