US3926024A - Method and device for regulating the thickness of rolled products - Google Patents

Method and device for regulating the thickness of rolled products Download PDF

Info

Publication number
US3926024A
US3926024A US084299A US8429970A US3926024A US 3926024 A US3926024 A US 3926024A US 084299 A US084299 A US 084299A US 8429970 A US8429970 A US 8429970A US 3926024 A US3926024 A US 3926024A
Authority
US
United States
Prior art keywords
thickness
effort
mill
gauge
output
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
US084299A
Other languages
English (en)
Inventor
Jean Philippe Mornas
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.)
Compagnie des Ateliers et Forges de la Loire SA
Original Assignee
Compagnie des Ateliers et Forges de la Loire SA
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 Compagnie des Ateliers et Forges de la Loire SA filed Critical Compagnie des Ateliers et Forges de la Loire SA
Application granted granted Critical
Publication of US3926024A publication Critical patent/US3926024A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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

  • This invention relates in general to the continuous regulation of rolled products during the processing thereof, and has particular reference to methods and means for regulating the thickness of a product processed in a rolling mill.
  • the present invention consists essentially of a method of continuously regulating, adjusting and readjusting the thickness of a product processed in a rolling mill, equipped with a position-corrected underload clamping system.
  • the rolling mill within a certain range of positions, is rendered elastic by causing the rolling effort to be responsive to a given preset reference value, and outside said range, the rolling mill recovers at least its natural rigidity or, better still, is made rigid, by properly monitoring said reference value of the effort responsiveness.
  • This invention is also concerned with a regulating device for carrying out the method set forth hereinabove, this device being characterized in that it comprises:
  • a primary correcting circuit adapted to set the value of the clamping position correction in such a manner that the measured rolling effort be constantly very substantially equal to a reference magnitude called the effort reference value;
  • a dead zone device having the property of transmitting in magnitude and sign of the signal applied to the input of this device, only the fraction lying outside a predetermined range, the limits of this range being disposed symmetrically on either side of a predetermined magnitude called a position reference,
  • a device having integrating and memory functions, which is responsive to said dead zone device in such a manner that its output signal is the integral of the signal delivered by said dead zone device, this output signal constituting the effort reference and being fed as such to the reference inlet of said primary circuit;
  • c. means for displaying the position reference, adjusting the width of the dead zone and putting the regulating system into its operative and inoperative conditions, as required.
  • FIGURE illustrates the wiring diagram of the regulating device of this invention, associated with the strip rolling mill.
  • the main hydraulic unit further comprises a pressure detector 7 for measuring the effort (rolling effort) exerted by the rolling mill on the product. Finally, the position of plunger 5 is also measured by a displacement detector 8 displaying the degree of clamping movement performed by the device.
  • this hydroelectric device for regulating the clamping force is described herein only because its very valuable properties, i.e., its rapidity, precision and reliability, make the device highly adaptable to features characterizing the device of the present invention to be described hereafter.
  • this choice does not constitute a limiting factor as far as the present invention is concerned, since the invention relates more particularly to the method of determining the reference signal e3.
  • the information received from detector 7 can be added at 12 to a corrector signal C cancelling the error due to roll bending, if the mill comprises means for detecting this bending.
  • a signal ep corresponding to the actual rolling effort is obtained in wire 13.
  • This signal ep is compared at 28 with the reference signal ef existing and the difference is applied to wire 11, in a correcting amplifier 14.
  • the latter delivers an output signal e3 which, as already explained hereinabove, constitutes a reference signal for regulating the position of plunger 5.
  • this first regulating circuit is to reduce to zero the variations in thickness of the rolled product which are caused by variations in the clamping pressure as a consequence of the out-of-true of one or more rolls in the stand. Under these conditions it is obvious that a clamping device having a high degree of dynamic performance must be used for the frequency of the correcting movements is relatively high, i.e., of the order of several Hertz as far as the fundamental component is concerned.
  • FIG- URE An exemplary form of an embodiment of this aspect of the invention is shown diagrammatically in the FIG- URE.
  • the effort regulating circuit produces movements of the plunger 5 and therefore of piston 6 for compensating very exactly the variations in the clamping efforts which are caused by the out-of-true.
  • the amplitude of these movements is such that the reference signal e3 varies exactly within the above-defined range em: K.
  • the threshold device 17 delivers a zero signal and the output voltage of integrator 18 remains constant.
  • the reference signal cf of the rolling effort is not only fed to the effort corrector but also to one input of comparator 19.
  • the other input of this comparator receives at 23 a reference voltage eo corresponding to a given, constant effort F0.
  • the difference (ef eo) is amplified k times by an amplifier 20 whose output is fed to.an adder 21.
  • This adder is an optional component of the third circuit and if provided it receives various correcting signals whose functions will be explained presently.
  • the output of this adder is the reference signal em of the second circuit which limits the amplitude of the action exerted by the effort corrector.
  • This third circuit operates as follows: when the characteristics of the product vary, and assuming for example that the input thickness increases, as explained in the foregoing, the clamping reference e3 tends to overstep the limits of the range em i K imposed thereto, and this is attended by an increase in the reference effort value ef. More exactly, in the selected example concerning an increase in the input thickness e3 decreases and tends to become lower than em K.
  • this third circuit operates somewhat like a well-known thickness regulator. These devices operate by compensating. the yield in proportion to the effort or to the effort variation. More particularly, if the coefficient of amplification k2 of amplifier 20 is equal (with due consideration for the sensitivity of the position and pressure detectors) to the coefficient of elasticity kl of the rolling mill, it will be proved that the yield compensation is complete and the output thickness constant.
  • a thickness gauge may be disposed upstream of the rolling mill so as to detect any variation in thickness of the incoming product before it is engaged between the rolls. In this case it is extremely difficult to utilize this information, even with a suitable time-lag for taking account of the travel time betweenthe gauge and the roll stand, and at the same time the system for compensating the yield proportional to the effort variation. In fact, in this case two independent regulating circuits are involved and the correction orders issuing therefrom are added to each other instead of substituting the order of the second circuit for that of the first.
  • the reference value em increases by the same quantity k1 A F since it was adjusted as explained in the foregoing k2 Id, (k2 being the coefficient of amplification of 20, as already mentioned hereinabove).
  • the correction by upstream measurement provides a pre-adjustment of the clamping force, which is subsequently and possibly modified by the yield compensation chain.
  • a primary correcting circuit connected to said measuring means and adapted to set the value of a clamping position correction in such a manner that the measured rolling effort is constantly very sub stantially equal to a first reference magnitude called an effort reference value;
  • a second correcting circuit connected to said first circuit and to said measuring means and adapted to determine the magnitude of the said effort refer ence value, said second circuit comprising:
  • a dead zone device having the property of transmitting, in magnitude and sign, of the signal applied to the input of this device, only the fraction lying outside of a predetermined range, the limits of this range being disposed symmetrically on either side of a predetermined magnitude called a position reference,
  • a device having integrating and memory functions responsive to said dead zone device in such a manner that its output signal is the integral of the signal delivered by said dead zone device, this output signal constitutes the effort reference value and is connected to a reference inlet of said primary circuit;
  • a device for regulating the thickness of a rolled product according to claim 2 further including a thickness gauge located near the input to said rolling mill for measuring the thickness of the product fed to said mill; said gauge having an output connected to the input of said device having integrating and memory functions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US084299A 1969-10-31 1970-10-27 Method and device for regulating the thickness of rolled products Expired - Lifetime US3926024A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6937440A FR2063781A5 (enrdf_load_stackoverflow) 1969-10-31 1969-10-31

Publications (1)

Publication Number Publication Date
US3926024A true US3926024A (en) 1975-12-16

Family

ID=9042396

Family Applications (1)

Application Number Title Priority Date Filing Date
US084299A Expired - Lifetime US3926024A (en) 1969-10-31 1970-10-27 Method and device for regulating the thickness of rolled products

Country Status (6)

Country Link
US (1) US3926024A (enrdf_load_stackoverflow)
JP (1) JPS4937623B1 (enrdf_load_stackoverflow)
BE (1) BE757563A (enrdf_load_stackoverflow)
DE (1) DE2052487A1 (enrdf_load_stackoverflow)
FR (1) FR2063781A5 (enrdf_load_stackoverflow)
GB (1) GB1319327A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521859A (en) * 1982-10-27 1985-06-04 General Electric Company Method of improved gage control in metal rolling mills

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52147824U (enrdf_load_stackoverflow) * 1976-05-07 1977-11-09
CN112893486B (zh) * 2021-01-21 2022-06-21 包头钢铁（集团）有限责任公司 一种宽厚板工作辊轴向力实时在线监测装置及监测方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416341A (en) * 1966-12-12 1968-12-17 Kaiser Aluminium Chem Corp Rolling mill control system
US3527074A (en) * 1966-12-19 1970-09-08 Forges De La Loire Cie Des Ate Device for regulating the thickness of rolling-mill products,and rolling mills equipped therewith
US3538727A (en) * 1966-12-19 1970-11-10 Forges Cie Des Atel Device for regulating the thickness of rolling-mill products and rollingmills equipped therewith
US3543549A (en) * 1967-11-21 1970-12-01 Davy & United Eng Co Ltd Rolling mill control for compensating for the eccentricity of the rolls
US3550413A (en) * 1965-07-16 1970-12-29 Gen Dynamics Corp Gage control for rolling mills
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
US3550413A (en) * 1965-07-16 1970-12-29 Gen Dynamics Corp Gage control for rolling mills
US3416341A (en) * 1966-12-12 1968-12-17 Kaiser Aluminium Chem Corp Rolling mill control system
US3527074A (en) * 1966-12-19 1970-09-08 Forges De La Loire Cie Des Ate Device for regulating the thickness of rolling-mill products,and rolling mills equipped therewith
US3538727A (en) * 1966-12-19 1970-11-10 Forges Cie Des Atel Device for regulating the thickness of rolling-mill products and rollingmills equipped therewith
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521859A (en) * 1982-10-27 1985-06-04 General Electric Company Method of improved gage control in metal rolling mills

Also Published As

Publication number Publication date
GB1319327A (en) 1973-06-06
FR2063781A5 (enrdf_load_stackoverflow) 1971-07-09
BE757563A (fr) 1971-03-16
DE2052487A1 (de) 1971-05-06
JPS4937623B1 (enrdf_load_stackoverflow) 1974-10-11

Similar Documents

Publication Publication Date Title
US3613419A (en) Rolling mill automatic gauge control with compensation for transport time
KR890001365B1 (ko) 연속압연기의 부하배분 제어방법
KR102297062B1 (ko) 판 두께 제어 장치 및 판 두께 제어 방법
US3938360A (en) Shape control method and system for a rolling mill
US3977223A (en) Hot strip mill tension control
US2972268A (en) Automatic strip thickness control apparatus
US3688532A (en) Control system for tandem rolling mill based on the constant volume principle
KR960006018B1 (ko) 만능압연대에서 웨브 및 플랜지의 두께를 조정하기 위한 방법 및 장치
US3926024A (en) Method and device for regulating the thickness of rolled products
US3877270A (en) Rolling mill including means for compensating for roll bending
US3731508A (en) Rolling of strip or plate material
US4491000A (en) Method and apparatus for improved sensing of roll separation force in a rolling mill
GB2118332A (en) Automatic plate thickness control device for a rolling mill
US4483165A (en) Gauge control method and apparatus for multi-roll rolling mill
US3961509A (en) Roll gap control
GB1312662A (en) Control system for a rolling mill
US3996776A (en) Strip thickness control
JPH0156842B2 (enrdf_load_stackoverflow)
GB2143341A (en) Rolling mills
RU2494828C1 (ru) Способ автоматического регулирования натяжения полосы в черновой группе клетей непрерывного прокатного стана
EP0500324B1 (en) Method of and apparatus for controlling hydraulic rolling reduction in a rolling mill
US3782153A (en) Method and system for controlling a tandem rolling mill
US3793860A (en) System to compensate for roll eccentricity effects and/or to simulate a mill with variable stretch characteristics
US3404550A (en) Workpiece shape and thickness control
US3875775A (en) Device for automatic adjustment of strip thickness in rolling