US3808857A - Gage control method and system for tandem rolling mills - Google Patents

Gage control method and system for tandem rolling mills Download PDF

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Publication number
US3808857A
US3808857A US00293619A US29361972A US3808857A US 3808857 A US3808857 A US 3808857A US 00293619 A US00293619 A US 00293619A US 29361972 A US29361972 A US 29361972A US 3808857 A US3808857 A US 3808857A
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United States
Prior art keywords
last
gage
stand
tension
error signal
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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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US00293619A
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English (en)
Inventor
J Connors
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AEG Westinghouse Industrial Automation Corp
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Individual
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Filing date
Publication date
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Priority to US00293619A priority Critical patent/US3808857A/en
Priority to CA180,121A priority patent/CA968873A/en
Priority to ES419116A priority patent/ES419116A1/es
Priority to FR7334845A priority patent/FR2201138B1/fr
Priority to JP48108587A priority patent/JPS5223618B2/ja
Application granted granted Critical
Publication of US3808857A publication Critical patent/US3808857A/en
Assigned to AEG WESTINGHOUSE INDUSTRIAL AUTOMATION CORPORATION reassignment AEG WESTINGHOUSE INDUSTRIAL AUTOMATION CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION
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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions

Definitions

  • the invention is characterized in that the roll force exerted on the strip by the last stand is maintained constant for all variations in last stand speed, thereby enabling a greater range of strip gage change via the last stand in the tandem mill.
  • the final output gage on Inulti-standmills is most widely performed by means of tension variation between the last stand and the previous stand.
  • an X-ray thickness gage positioned beyond the bite of the rolls of the last stand measures actual output thickness which is then compared with desired, final thickness to derive an error signal for controlling 'the last stand speed. If the actual, measured thickness is above desired gage, for example, then the last stand speed is increased to increase the tension between the last two stands and reduce gage.
  • the final output gage can also be controlled by adjusting the last stand screwdown; however this method can interfere with strip shape and-is not nearly as fastacting as gage control by tension variation between the last two stands.
  • a final gage control system and method for a tandem rolling mill wherein final gage is varied by varying tension in the strip material being rolled between the last two stands while the roll force exerted on the strip by the last stand is maintained constant for all variations in last stand speed to enable a greater range of final gage change.
  • Circuitry is provided which is responsive to the error signal for varying the speed of the last stand to thereby vary tension between the last two stands and vary actual output gage until the desired and actual output gages are the same and the error signal is zero.
  • a load cell is provided on the last'stand which produces an electrical signal proportional to roll force exerted by the last stand. This latter electrical signal is then used to maintain, preferably through hydraulic cylinders, a'constant roll force on strip material passing through the last stand regardless of variations in tension between the last two stands.
  • the system shown includes a five-stand tandem rolling mill including stands 81, S2, S3, S4 and S5.
  • Each stand includes a pair of work rolls l0 and 12 between which strip material 14 being rolled passes, together with a pair of backup rolls l6 and 18.
  • the stripissu'ing from the-last stand S5 is wound on a coiler 15.
  • the rolls of each stand are driven by means of drive motors M1, M2, M3, M4 and M5 each controlled by speedcontrol circuits C1, C2,
  • the speed control circuits C1-C5 are connected to a master speed controller 20 which establishes a nominal or desired speed for each of the stands in the mill to achieve a desired gage reduction.
  • a master speed controller 20 which establishes a nominal or desired speed for each of the stands in the mill to achieve a desired gage reduction.
  • the speed of the strip material issuing from any stand must be greater than that entering the stand in accordance with the constant volume principle. Accordingly, the speed of stand S2 must be greater than that of stand S]; the speed of stand S3 must be greater than that of stand S2, and so on the speed of stand S5 being greatest.
  • the chocks supporting the rolls in each stand are loaded by means of hydraulic cylinders H1, H2, H3, 1-14 and H5, respectively. That is, the hydraulic cylinders Hl-HS provide the necessary roll force to reduce the strip 14 in thickness. It is, of course, possible to use mechanical screwdown mechanisms or a wedgetype control to effect somewhat the same results; however hydraulic cylinders are preferred because of their speed of operation.
  • the gage of the strip material passing through the first stand S1 is measured by means of an X-ray gage 22 or the like.
  • Gage 22 produces an electrical signal proportional to the actual gage between stands S1 and S2; and this signal is applied to a gage control circuit 24 where it is compared with an electrical signal proportional to desired exit gage from stand S1. If the actual gage does not match the desired gage, then the gage control circuit, through appropriate hydraulic controls, either increases or decreases the pressure on cylinder H1 to increase or decrease theroll force and thereby vary the gage of material issuing from stand S1 until it matches the desired gage.
  • Stand 81 is the only stand in the tandem mill whose roll force is varied as a function of output gage in the. embodiment of the invention shown herein.
  • tensiometers T1, T2, T3 and T4 which measure tension in the strip material between each set of stands.
  • the tensiometer T1 measures the tension between stands S1 and S2 and produces an electrical signal proportional thereto.
  • This tension signal from tensiometer T1 is compared with a reference signal in tension control circuit TC2; and if the two are not the same, then the tension control circuit, through appropriate hydraulic controls, not shown, varies the pressure exerted by cylinder H2 for stand S2.
  • Similar tension control circuits TC3-TC5 are provided for stands S3-S5, respectively.
  • ple may simply comprise a potentiometer or the like.
  • the tension control circuit TCS enclosed by broken lines, is shown in somewhat greater detail than the tension controllers for the preceding stands.
  • the actual tension signal from tensiometer T4 between stands S4 and S5 is again compared with desired tension from circuit 32 in a tension error determining circuit 34.
  • the tension control system is similar to that of the preceding stands.
  • an error signal will be derived from circuit 34 if the actual output gage derived from X-ray gage 26 is not equal to the desired gage.
  • the tension error signal from circuit 34 is then applied to a tension compensation circuit where strip cross-sectional area and strip speed compensation are introduced into the error signal.
  • the output of the circuit 36 is then summed with the desired speed signal from master speed controller 20 in summer38. If the two are not the same, an error signal is applied to the speed control circuit C5 to vary the speed of stand S5.
  • the combination of claim 1 including a tensiometer for measuring tension between strip material being rolled between the last two stands in said multistand mill, said tensiometer producing a third electrical signal proportional to actual tension between the last two stands, means for comparing said third electrical signal with a fourth electrical signal proportional to desired tension and with said error signal proportional to a deviation in output gage from a desired gage to derive a second error signal, and means for controlling the speed of said last stand as a function of the magnitude of said second error signal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US00293619A 1972-09-29 1972-09-29 Gage control method and system for tandem rolling mills Expired - Lifetime US3808857A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00293619A US3808857A (en) 1972-09-29 1972-09-29 Gage control method and system for tandem rolling mills
CA180,121A CA968873A (en) 1972-09-29 1973-08-31 Gage control method and system for tandem rolling mills
ES419116A ES419116A1 (es) 1972-09-29 1973-09-27 Un sistema de control para un tren de laminacion en tan- dem.
FR7334845A FR2201138B1 (2) 1972-09-29 1973-09-28
JP48108587A JPS5223618B2 (2) 1972-09-29 1973-09-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00293619A US3808857A (en) 1972-09-29 1972-09-29 Gage control method and system for tandem rolling mills

Publications (1)

Publication Number Publication Date
US3808857A true US3808857A (en) 1974-05-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00293619A Expired - Lifetime US3808857A (en) 1972-09-29 1972-09-29 Gage control method and system for tandem rolling mills

Country Status (5)

Country Link
US (1) US3808857A (2)
JP (1) JPS5223618B2 (2)
CA (1) CA968873A (2)
ES (1) ES419116A1 (2)
FR (1) FR2201138B1 (2)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4771622A (en) * 1986-03-12 1988-09-20 International Rolling Mill Consultants Inc. Strip rolling mill apparatus
US20070068210A1 (en) * 2005-09-29 2007-03-29 University Of Pittsburgh - Of The Commonwealth System Of Higher Education System for controlling a rolling mill and method of controlling a rolling mill
US9095886B2 (en) 2011-06-27 2015-08-04 University Of Central Florida Research Foundation, Inc. Mill control system and method for control of metal strip rolling
US11351584B2 (en) * 2019-04-25 2022-06-07 Toyota Jidosha Kabushiki Kaisha Calibration determination device and calibration determination method for calibrating the tension of a bonding member

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6017861U (ja) * 1982-12-01 1985-02-06 安田株式会社 金属製引違戸の引手

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2988680A (en) * 1959-02-27 1961-06-13 George P Dirth High-gain quick-response control system for strip mill
US2999406A (en) * 1957-05-06 1961-09-12 Industrial Nucleonics Corp Control apparatus
US3049036A (en) * 1957-04-08 1962-08-14 Westinghouse Electric Corp Automatic strip thickness control apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3049036A (en) * 1957-04-08 1962-08-14 Westinghouse Electric Corp Automatic strip thickness control apparatus
US2999406A (en) * 1957-05-06 1961-09-12 Industrial Nucleonics Corp Control apparatus
US2988680A (en) * 1959-02-27 1961-06-13 George P Dirth High-gain quick-response control system for strip mill

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4771622A (en) * 1986-03-12 1988-09-20 International Rolling Mill Consultants Inc. Strip rolling mill apparatus
US20070068210A1 (en) * 2005-09-29 2007-03-29 University Of Pittsburgh - Of The Commonwealth System Of Higher Education System for controlling a rolling mill and method of controlling a rolling mill
US9095886B2 (en) 2011-06-27 2015-08-04 University Of Central Florida Research Foundation, Inc. Mill control system and method for control of metal strip rolling
US11351584B2 (en) * 2019-04-25 2022-06-07 Toyota Jidosha Kabushiki Kaisha Calibration determination device and calibration determination method for calibrating the tension of a bonding member

Also Published As

Publication number Publication date
FR2201138A1 (2) 1974-04-26
JPS4993254A (2) 1974-09-05
JPS5223618B2 (2) 1977-06-25
ES419116A1 (es) 1976-06-16
CA968873A (en) 1975-06-03
FR2201138B1 (2) 1978-11-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: AEG WESTINGHOUSE INDUSTRIAL AUTOMATION CORPORATION

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION;REEL/FRAME:005424/0551

Effective date: 19900313