US3766762A - Control method of tension in rolling mills (2) - Google Patents

Control method of tension in rolling mills (2) Download PDF

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Publication number
US3766762A
US3766762A US00174485A US3766762DA US3766762A US 3766762 A US3766762 A US 3766762A US 00174485 A US00174485 A US 00174485A US 3766762D A US3766762D A US 3766762DA US 3766762 A US3766762 A US 3766762A
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United States
Prior art keywords
strip
value
size alteration
prior
size
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Expired - Lifetime
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US00174485A
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English (en)
Inventor
S Fujii
H Kuwamoto
M Kamata
M Ishida
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JFE Engineering Corp
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Nippon Kokan Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
    • H02G3/0616—Joints for connecting tubing to casing
    • H02G3/0625—Joints for connecting tubing to casing with means for preventing disengagement of conductors
    • 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 present invention concerns a control method of maintaining a constant tension per unit cross sectional area during the rolling process even when the plate thickness is changed during rolling of strips.
  • the present invention has been contrived in view of the above mentioned situation and offers amethod of tension control of a rolling machine wherein the detected variation in strip thickness during size alteration is divided by the strip thickness prior to the size alteration, i.e., Ah/h'; and the detected width variation during size alteration is divided by the strip width prior to size variation, i.e., Aw/w; the value of 1 is added to the total of the two, i.e., 1+(Ah/h) (Aw/w) and the value thus obtained is multiplied by the values of the total tension prior to the size alteration, i.e., T,,[ 1+(Ah/h) (Aw/w)]. This value thus obtained is set as an aimed value of the total tension to the tension control in accordance with the present invention.
  • the total tension of the strip is obtained by multiplication of the tensile stress, the strip thickness and the strip width.
  • FIG. 1 there is shown a tandem rolling mill having a plurality of stands and wherein the tensile stress between the (i)the stand and the (i+1)th stand are kept at an aimed value.
  • (1) denotes (i)th stand rolling machine, (2) (i+l )th stand, (3) and (4) load cells for each stand, (5) and (6) screw down mechanisms for each stand, (7) and (8) electric motors for the screw downs of each stand, (9) and (10) electric motors for driving purposes for each stand, (11) the width measuring device, (12) a tension meter, (13) and (14) the electric delays that become off while the tensile stress is under a control to be kept constant, (16) and (17) devices, such as operational amplifiers, to divide the values from the load cell by the Mill constant (hereinafter referred to as a damping device), (18), (19) and (20) memory circuits, (21) an arithmeticcircuit, (22) a multiplier and (23) a tension control circuit.
  • a damping device
  • the rolling load signal detected by a load cell(3) be-' comes P/M' at the clamping device (16), is added to the roll positioning signal to be fed into the memory circuit (18).
  • the memory circuit In the memory circuit is' memorized the value immediately before the input electricrelay (13) becomes off by a servo motor or the like. .
  • the input relay (13) of the memory circuit (18) goes from on to off, the value of S+P/M immediately before and the successive'S+P/M values are compared and the differences Ah therebetween are fed into the damping device (17).
  • S denotes the screw positioning signal
  • P the rolling load signal M the mill constant and h the strip thickness.
  • the damping devices (l 6)'and (17) are chosen so that the damping ratio becomes M and h functions of actual physical quantities (l/M and l/h amplification ratio when the same is considered as the amplifier). M and h are to be preliminarily given by a manual operation.
  • the electric signal corresponding to Ah/h is obtained on the output side of the damping device (17).
  • the strip width signal detected by the strip width measuring device (11) is fed into the memory circuit (19) and the arithmetic circuit (21). In the memory circuit (19) is memorized the input value immediately before the input relay (14) became off from on.
  • the arithmetic circuit (21) is designed so that l w /w is delivered from the two input signals W and W Accordingly, the output of the airthmetic circuit (21) is zero when the relay (14) is closed and becomes 1 w /w or Aw/w when it is open.
  • W denotes the strip width value immediately before the relay (14) becomes of from on, and W is the strip width value detected at every moment of the control.
  • the tension signal detected by the tension meter (12) is fed into the memory circuit (20). In the memory circuit (20) is memorized the input value immediately before the input electric relay (15) becomes of from on.
  • the output of the memory circuit (20) and the total of the output of the clamping device (17) and the arithmetic circuit (21) is multipled by the multiplier (22) and delivered. This output represents the following formula:
  • the obtained value becomes the aimed total tension during the control.
  • the difference between the aimed total tension and the actual total tension is fed to the tension control circuit (23) as a deviation, and the control signal from the tension control circuit (23) is fed to the driving motor for the (i)th stand or to the screw down motor for (i+l )th stand to conduct the tension control of this invention.
  • the unit tension of the strip may be maintained constant even during the transitional period. This will facilitate prevention of plate ruptures during rolling and the smooth operation of the system during size alteration.
  • step of dividing the detected plate thickness variation by the strip thickness prior to said size alteration includes measuring the roll down position of the roll at a given stand; measuring the rolling load at said given stand; combining the roll position and rolling load measurements to generate a signal corresponding to the plate thickness variation; and then dividing said plate thickness variation signal by a value corresponding to the strip thickness prior to said size alteration.
  • said combining step includes memorizing the measured value of roll position immediately prior to the size alteration; and combining the memorized roll position value, the roll position value during the size variation, and the rolling load during the size variation to develop a signal corresponding to said plate thickness variation.
  • step of dividing the strip width variation by the strip width prior to said size alteration includes memorizing the strip width immediately prior to said size alteration; an arithmetically combining said memorized strip width with the measured strip width during said size alteration to thereby develop a signal corresponding to the value of the strip width variation divided by the strip width during the size alteration.
  • step of dividing the strip width variation by the strip width prior to said size alteration includes memorizing the strip width immediately prior to said size alternation; and arithmetically combining said memorized strip width with the measured strip widthduring said size alteration to thereby develop a signal corresponding to the value of the strip width variation divided by the strip width during the size alteration.
  • the method of claim 5 including the step of summing the signal corresponding to the thickness variation divided by the strip thickness prior to said size alteration and the signal corresponding to said width variation divided by said width prior to said size alteration.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US00174485A 1970-08-29 1971-08-24 Control method of tension in rolling mills (2) Expired - Lifetime US3766762A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45075440A JPS4938978B1 (enrdf_load_stackoverflow) 1970-08-29 1970-08-29

Publications (1)

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US3766762A true US3766762A (en) 1973-10-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00174485A Expired - Lifetime US3766762A (en) 1970-08-29 1971-08-24 Control method of tension in rolling mills (2)

Country Status (5)

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US (1) US3766762A (enrdf_load_stackoverflow)
JP (1) JPS4938978B1 (enrdf_load_stackoverflow)
DE (1) DE2143066C3 (enrdf_load_stackoverflow)
FR (1) FR2103612B1 (enrdf_load_stackoverflow)
GB (1) GB1326169A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109731921A (zh) * 2019-03-01 2019-05-10 北京金自天正智能控制股份有限公司 一种精轧机架间张力的计算方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63149017U (enrdf_load_stackoverflow) * 1987-03-20 1988-09-30
CN107695108B (zh) * 2017-09-28 2019-03-01 北京首钢自动化信息技术有限公司 一种提高轧制过程稳定性的张应力动态补偿方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015974A (en) * 1958-09-18 1962-01-09 Gen Electric Automatic control system for rolling mills and adjustable dies
US3281917A (en) * 1964-01-08 1966-11-01 United States Steel Corp Method and apparatus for coldrolling strip continuously
US3332263A (en) * 1963-12-10 1967-07-25 Gen Electric Computer control system for metals rolling mill
US3603124A (en) * 1968-05-09 1971-09-07 Nippon Kokan Kk Computer control system for rolling metal strips using feed-forward and prediction
US3618348A (en) * 1968-05-21 1971-11-09 Nippon Kokan Kk Method of controlling rolling of metal strips

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1427930B2 (de) * 1963-03-28 1974-01-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Einrichtung zur Banddickenregelung in mehrgerüstigen Walzenstraßen
SE333601B (enrdf_load_stackoverflow) * 1966-09-15 1971-03-22 Asea Ab
US3507134A (en) * 1968-02-20 1970-04-21 Westinghouse Electric Corp Interstand tension control for tandem cold rolling mills

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015974A (en) * 1958-09-18 1962-01-09 Gen Electric Automatic control system for rolling mills and adjustable dies
US3332263A (en) * 1963-12-10 1967-07-25 Gen Electric Computer control system for metals rolling mill
US3281917A (en) * 1964-01-08 1966-11-01 United States Steel Corp Method and apparatus for coldrolling strip continuously
US3603124A (en) * 1968-05-09 1971-09-07 Nippon Kokan Kk Computer control system for rolling metal strips using feed-forward and prediction
US3618348A (en) * 1968-05-21 1971-11-09 Nippon Kokan Kk Method of controlling rolling of metal strips

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109731921A (zh) * 2019-03-01 2019-05-10 北京金自天正智能控制股份有限公司 一种精轧机架间张力的计算方法
CN109731921B (zh) * 2019-03-01 2020-05-19 北京金自天正智能控制股份有限公司 一种精轧机架间张力的计算方法

Also Published As

Publication number Publication date
FR2103612B1 (enrdf_load_stackoverflow) 1974-03-29
GB1326169A (en) 1973-08-08
FR2103612A1 (enrdf_load_stackoverflow) 1972-04-14
DE2143066A1 (de) 1972-03-09
DE2143066B2 (de) 1980-07-31
JPS4938978B1 (enrdf_load_stackoverflow) 1974-10-22
DE2143066C3 (de) 1981-04-09

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