US3492845A - Rolling mill control system - Google Patents

Rolling mill control system Download PDF

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Publication number
US3492845A
US3492845A US692923A US3492845DA US3492845A US 3492845 A US3492845 A US 3492845A US 692923 A US692923 A US 692923A US 3492845D A US3492845D A US 3492845DA US 3492845 A US3492845 A US 3492845A
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US
United States
Prior art keywords
rolls
control system
roll
rolling mill
working
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
Application number
US692923A
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English (en)
Inventor
Susumu Nomura
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.)
Shibaura United Engineering Co Ltd
Original Assignee
Shibaura United Engineering Co Ltd
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
Application filed by Shibaura United Engineering Co Ltd filed Critical Shibaura United Engineering Co Ltd
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Publication of US3492845A publication Critical patent/US3492845A/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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/235—Calendar

Definitions

  • This invention relates to rolling mill control systems and more particularly to an apparatus for eliminating effects caused by displacement of rolls of rolling mills whereby to prevent variations in the gauge of the plates or sheets due to displacement of the rolls.
  • a novel control system for a rolling mill including a pair of working rolls, a pair of backup rolls, mill screws for adjusting the position of said back-up rolls, said control system comprising a hydraulic cylinder associated with one of said back-up rolls, a first load cell associated with at least one of said mill screws for generating an electrical signal representing the force exerted thereby, a second load cell associated with the other of said back-up rolls to provide an electrical signal representing the rolling load, means associated with said working and back-up rolls for generating an electrical signal represent-ing the distance between the axes of said working and back-up rolls and means to compare said electrical signals to control said hydraulic cylinder.
  • a iiourhigh rolling mill shown therein comprises a pair of housings 16 (only one of which is shown) each including a rectangu-lar vertical window 17.
  • a pair of work-ing rolls 1a ice and 1b and a pair of back-up rolls 2a and 2b are disposed between housings and opposite ends of these working rolls, and the back-up rolls are respectively supported by working roll bearing chocks 8a and 8b and back-up roll hearing chocks 7a and 7 b.
  • the working roll bearing chocks are slidably received in recesses in back-up roll bear-ing chocks 7a and 7b which are slidably received in windows 17 of housings 16 in a manner well known in the art.
  • a pair of adjusting rods 4 are secured to or urged against the upper surface of the lower back-up roll bearing chock 7b and freely pass through upper back-up roll bearing chock 7a.
  • a load cell 3 is interposed between the upper end of each adjusting rod and screw 18 of the mill to measure force P applied to the adjusting rod.
  • Another load cell 5 is interposed between the upper surface of the upper back-up roll bearing chock 7a and an upper yoke of the housing to measure force P or rolling load on the back-up rol-l.
  • Devices 6a and 612 such as differential transformers, potentiometers and the like are interposed between cooperating pairs of back-up and working roll bearing chocks 7a, 8a and 7b, 8b to measure variations in the spacing therebetween to generate electrical signals representing said variations.
  • the lower back-up roll bearing chock 7b is urged upwardly by a hydraulic cylinder 9 interposed between the bottom thereof and the bottom yoke of the housing. Electric signals from measuring devices 6a and 6b are added by an adder 10 to provide a signal representing the deviation of the sum from a reference signal.
  • a comparator 14 which may include an amplifier is provided to compare the output signal from adder 10 with the out signals from amplifier 11 and multiplier 13 to provide an output signal to control a pressure regulator 15 for the fluid pressure supplied to the hydraulic cylinder 9.
  • Equation 2 becomes zero which means that the roll gap is independent of the rolling load.
  • Equation 2 K (Ki then the left hand side of Equation 2 will have a definite value. Displacement of one or both of back-up rolls 2a and 215 causes a result equivalent to the variation in roll gap S thus causing the plate gauge to vary.
  • the comparator 14 functions to establish a relation
  • Equation 3 a quantity proportional to the sum S of two signals representing displacements of back-up rolls 2a and 2b measured by measuring devices 6a and 6b, we obtain CP P KBS
  • Equation 4 When Equation 4 is substituted in Equation 1, the following equation representing the control for the operation wherein rolls are displaced can be obtained.
  • Equation Since signal S representing roll displacement is included in both the left and right hand sides of Equation 5, it is clear than Equation is equivalent to Equation 2.
  • Equation 2 the relation between roll gap and rolling load as expressed by Equation 2 can be always maintained irrespective of the presence or absence of roll displacement.
  • Operation of fluid pressure cylinder 9 results in variation of P and P and hence in variation of the output from comparator 14 so that the pressure of the fluid supplied to hydraulic cylinder 9 is adjusted until output signal is reduced to zero.
  • a control system for a rolling mill including a pair of working rolls, a pair of back-up rolls, and mill screws for adjusting the position of said back-up rolls, said control system comprising a hydraulic cylinder associated with one of said back-up rolls, a first load cell associated with at least one of said mill screws for generating an electrical signal representing the force exerted thereby, a second load cell associated with the other of said back-up rolls to provide an electrical signal representing the rolling load, means associated with said working and back-up rolls for generating an electrical signal representing the distance between the axes of said working and back-up rolls and means to compare said electrical signals to control said hydraulic cylinder.
  • said means to compare said electrical signals comprises a comparator used to provide an output signal corresponding to the difference between said three electrical signals, and said output signal controls the pressure of the fluid supplied to said hydraulic cylinder so as to reduce said output from said comparator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US692923A 1966-12-30 1967-12-22 Rolling mill control system Expired - Lifetime US3492845A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8586266 1966-12-30

Publications (1)

Publication Number Publication Date
US3492845A true US3492845A (en) 1970-02-03

Family

ID=13870677

Family Applications (1)

Application Number Title Priority Date Filing Date
US692923A Expired - Lifetime US3492845A (en) 1966-12-30 1967-12-22 Rolling mill control system

Country Status (4)

Country Link
US (1) US3492845A (enrdf_load_stackoverflow)
DE (1) DE1588811A1 (enrdf_load_stackoverflow)
FR (1) FR1555893A (enrdf_load_stackoverflow)
GB (1) GB1182160A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662576A (en) * 1969-06-21 1972-05-16 Ver Flugtechnische Werke Control for roll gap of a rolling mill
US3936258A (en) * 1974-01-30 1976-02-03 Intercole Automation, Inc. Calender
US4015919A (en) * 1975-05-24 1977-04-05 Hermann Berstorff Maschinenbau Gmbh Multi-roll calender for rubber or synthetic plastics materials

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2111608A1 (de) * 1971-03-11 1972-09-14 Ishikawajima Harima Heavy Ind Regeleinrichtung fuer ein hydraulisches Walzwerk
JPS5143825B2 (enrdf_load_stackoverflow) * 1973-03-02 1976-11-25

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208251A (en) * 1961-05-03 1965-09-28 Westinghouse Canada Ltd Rolling mill control system
US3247697A (en) * 1962-12-06 1966-04-26 Blaw Knox Co Strip rolling mill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208251A (en) * 1961-05-03 1965-09-28 Westinghouse Canada Ltd Rolling mill control system
US3247697A (en) * 1962-12-06 1966-04-26 Blaw Knox Co Strip rolling mill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662576A (en) * 1969-06-21 1972-05-16 Ver Flugtechnische Werke Control for roll gap of a rolling mill
US3936258A (en) * 1974-01-30 1976-02-03 Intercole Automation, Inc. Calender
US4015919A (en) * 1975-05-24 1977-04-05 Hermann Berstorff Maschinenbau Gmbh Multi-roll calender for rubber or synthetic plastics materials

Also Published As

Publication number Publication date
FR1555893A (enrdf_load_stackoverflow) 1969-01-31
GB1182160A (en) 1970-02-25
DE1588811A1 (de) 1971-07-29

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