US3851509A - Rolling mill gauge control method and apparatus including speed correction - Google Patents

Rolling mill gauge control method and apparatus including speed correction Download PDF

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Publication number
US3851509A
US3851509A US00303725A US30372572A US3851509A US 3851509 A US3851509 A US 3851509A US 00303725 A US00303725 A US 00303725A US 30372572 A US30372572 A US 30372572A US 3851509 A US3851509 A US 3851509A
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roll
roll stand
gauge
stand
speed
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R Fox
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AEG Westinghouse Industrial Automation Corp
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Westinghouse Electric Corp
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Priority to BE793762D priority Critical patent/BE793762A/xx
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Priority to US00303725A priority patent/US3851509A/en
Priority to AU50359/72A priority patent/AU465672B2/en
Priority to FR7300338A priority patent/FR2205376B1/fr
Priority to JP12408773A priority patent/JPS5340938B2/ja
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Publication of US3851509A publication Critical patent/US3851509A/en
Assigned to AEG WESTINGHOUSE INDUSTRIAL AUTOMATION CORPORATION reassignment AEG WESTINGHOUSE INDUSTRIAL AUTOMATION CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION
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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

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  • ABSTRACT [52] US. Cl. 72/8, 72/16 An automatic gauge control is disclosed to provide on [51] Int. Cl B21b 37/00 line control of the delivery gauge or thickness from at [58] Field of Search 72/8, 9, 10, l 1, 12, 16, least one roll stand ofa tandem rolling mill. The gauge 72/21, 19, error of the workpiece strip leaving that one roll stand is determined in relation to the speed of that one roll [56] References Cited stand and is corrected by predetermined adjustment of UNITED STATES PATENTS that one Stand- 3,332.263 7/1967 Beadle et al.
  • the present invention relates to workpiece strip metal tandem rolling mills and more particularly to roll force gauge control systems and methods used in operating such rolling mills.
  • the unloaded opening and the speed at each tandem mill stand or for each reversing mill pass are set up to produce successive workpiece strip or plate reductions resulting in work product at the desired gauge.
  • the loaded roll opening at a stand equals the stand delivery gauge or thickness on the basis of the usual assumption that there is little or no elastic work-piece recovery.
  • a stand automatic gauge control system is employed if it is necessary that the stand delivery gauge be closely controlled.
  • a stand gauge control system is normally used for a reversing mill stand and for predetermined stands in tandem rolling mills.
  • the roll force gauge control system uses Hookes law in controlling the screwdown position at a rolling stand, i.e., the loaded roll opening under workpiece rolling conditions equals the unloaded roll opening or screwdown position plus the mill stand spring stretch caused by the separating force applied to the rolls by the work-piece.
  • a load cell or other force detector measures the roll separating force at each controlled roll stand and the screwdown position is controlled to balance roll force changes from a reference value and thereby hold the loaded roll opening at a substantially constant value.
  • I-Iot strip mill automatic gauge control including evaluation of roll force feedback information involves the combination of a number of process variables, such as roll force, screw position, and mill spring which are all used to evaluate the gauge of the stirp as it is worked in each stand.
  • an X-ray gauge is used on the strip as it passes out of the last stand to evaluate the absolute strip gauge produced.
  • the two gauge error detection systems that are commonly used are the X-ray and roll force.
  • X-ray gauges can be placed between each stand, but they are expensive, difficult to maintain, and can detect errors only as the strip passes between stands.
  • the roll force error detection system is much less expensive, and can be more easily implemented in relation to the operation of all stands, to detect errors in gauge as the strip passes between the rolls of a particular roll stand, providing immediate evaluation of desired corrections to the roll openings.
  • the roll force system however provides only a relative evaluation of the gauge, since it measures the amount of gauge deviation from a reference gauge, such as the gauge at the head end of the strip.
  • a practical combination of the two systems uses rollforce feedback to calculate fast corrections to fluctuations in gauge, and an X-ray gauge to evaluate the absolute gauge of the strip coming out of the last stand.
  • the fast corrections are calculated from the roll force feedback, the stand screwdown position, and the modulus of elasticity of the rolling stand.
  • the slower X-ray gauge evaluation calculates simultaneous corrections to several stands, so that the absolute value of the gauge may be brought to the desired value.
  • the roll force gauge control system is an analog arrangement including analog comparison and amplification circuitry which responds to roll force and screwdown position signals to control the screwdown position and hold the following equality:
  • the lock-on screwdown position LOSD and the lock-on roll separating force LOF are measured to establish what strip delivery gauge G should be maintained out of that roll stand.
  • the roll stand separating force F and the roll stand screwdown position value SD are monitored periodically and any undesired change in roll separating force is detected and compensated for by a corresponding correction change in screwdown position.
  • the lock-on gauge LOG is equal to the lockon screwdown LOSD plus the lock-on force LOF multiplied by the mill stand spring modulus K.
  • the workpiece strip delivery gauge G leaving the roll stand at any time during the rolling operation is in accordance with above equation (1) and is equal to the unloaded screwdown position SD plus the roll separating force F multiplied by the mill spring modulus K.
  • the roll force determined gauge error GE in relation to a particular roll stand is derived by subtracting the lock-on gauge LOG from the present delivery gauge G.
  • the well known X-ray monitor gauge control system is usually employed to producescrewdown offset for the roll force control.
  • an X-ray or other radiation gauge sensing device is placed at one or more predetermined process points and usually at least at a process point following the delivery end after the last roll stand of th mill, in order tosense actual delivery gauge after a work-piece transport delay from the point in time at which the actual delivery gauge is produced at the preceding stand or stands.
  • the monitor system compares the actual delivery gauge with the desired delivery gauge and develops an X-ray gauge error as an analog feedback control signal to adjust the operation of the reversing mill roll force gauge control system or one or more predetermined tandem mill stand roll force gauge control systems to supply desired steady state mill delivery gauge.
  • the conventional monitor system provides for transport delayed correction of steady state gauge errors which are caused or which are tending to be caused by a single mill variable or by a combination of mill variables.
  • a programmed digital computer system can be employed to make the gauge error correction screwdown movement determinations as well as to perform other mill control functions.
  • the computer employs a programming system including an automatic roll force gauge control program or AGC program which is executed at predetermined periodic intervals to calculate the desired screwdown movement required at each roll force gauge controlled stand for gauge error correction including that stemming from roll force error detection at that stand.
  • a system and method for controlling gauge in a metal rolling mill employs means for determining gauge error in the workpiece delivered from a given roll stand in relation to the force and speed of that roll stand, and means for'controlling the screwdown position of that'one roll stand of the mill for correcting this determined gauge error.
  • FIG. 1 shows a schematic diagram of a tandem hot steel strip rolling mill and an automatic gauge control system arranged for operation in accordance with the present invention
  • FIG. 2 illustrates the typical mill spring curve and workpiece reduction curve for a given rolling mill stand and the operation of that roll stand for reducing the gauge of workpiece passed through the roll stand;
  • FIG. 3 illustrates, in relation to the mill spring curve and the workpiece reduction curve, the effect of a correction made to the screwdown position setting for changing the unloaded roll opening of a roll stand to provide a desired change in the workpiece gauge delivered from that roll stand;
  • FIG. 4 shows an illustrative gauge error detection operation in relation to the initial lock on conditions at the head end of the workpiece
  • FIG. 5 shows a schematic illustration of the speed correction operation in accordance with the present invention
  • FIG. 6 shows an illustrative logic flow chart of a suitable speed correction control program operative in accordance with the present invention.
  • FIG. 7 shows a graphical illustration of the nonlinear relationship provided for the speed correction in accor dance with the present invention.
  • FIG. I a tandem hot strip steel finishing mill ll operated with improved gauge control performance by a process control system 13 in accordance with the principles of the invention.
  • the invention is applicable to various types of mills in which roll force gauge control is employed.
  • the tandem mill 11 includes a series of reduction rolling stands with only two of the stands S1 and S6 shown.
  • a workpiece l5 enters the mill 11 at the entry end in the form of a bar and it is elongated as it is transported through the successive stands to the delivery end of the mill where it is coiled as a strip on a downcoiler 17.
  • the entry bar would be of known steel grade class and it typically would have a known input gauge or thickness of about 1 inch and a width within some limited range such as inches to 80 inches.
  • the delivered strip would usually have approximately the same width and a thickness based upon the production order for which it is intended.
  • the successive stands operate at successively higher speeds to maintain proper workpiece mass flow.
  • Each stand produces a predetermined reduction or draft such that the total mill draft reduces the entry bar to strip with the desired gauge or thickness.
  • Each stand is conventionally provided with a pair of backup rolls l9 and 21 and a pair of work rolls 23 and 25 between which the workpicec 15 is passed.
  • a large DC drive motor 27 is controllably energized at each stand to drive the corresponding work rolls at a controlled speed.
  • the sum of the unloaded work roll opening and the mill stretch substantially defines the workpiece gauge delivered from any particular stand in accordance with I-Iookes law.
  • a pair of screwdown motors 29 (only one shown at each stand) position respective screwdowns 31 (only one shown at each stand) which clamp against opposite ends of the backup rolls and thereby apply pressure to the work rolls.
  • the two screwdowns 31 at a particular stand would be in identical positions, but they can be located in different positions for strip guidance during threading, for flatness or other strip shape control purposes or possibly for other purposes.
  • a conventional screwdown position detector or encoder 33 provides an electrical signal representation of screwdown position at each stand.
  • a screwdown position detection system which includes the screwdown position detection 33 can be provided and calibrated from time to time.
  • Roll force detection is provided at each of predetermined stands by a conventional load cell 35 which generates an electrical analog signal in accordance with the stand roll force.
  • each roll force controlled stand is provided with a load cell 35 and in many cases stands without roll force gauge control would also be equipped with load cells.
  • the number of stands to which roll force gauge control is applied is predetermined during the mill design in accordance with cost-performance standards, and increasingly there is a due to apply roll force gauge control to all of the stands in a tandem hot strip steel mill. In the present case, a roll force gauge control system is assumed to be employed at each of the stands.
  • Conventional motorized sideguards 37 are located at predetermined points along the mill length. The sideguards 37 are operated during mill setup on the basis of the widths of the workpiece travel path for guidance purposes.
  • the process control system 13 provides automatic control for the operaton of the tandem mill 11 as well as desired control for associated production processes '(not indicated) such as the operation of a roughing mill.
  • the process control system I3 can include a programmed process control digital computer system which is interfaced with the various mill sensors and the various mill control devices to provide control over many of the various functions involved in operating the tandem mill 11.
  • the control system 13, can also include conventional manual and/or automatic analog controls for selected process control functions.
  • the digital computer processor can be associated with well known predetermined input systems typically including a conventional contact closure input system which scans contact or other signals representing the status of various process conditions, a conventional analog input system which scans and converts process analog signals, and operator controlled and other information input devices and systems 41 such as paper tape teletypewriter and dial input systems. It is noted that the information input devices 41 are generally indicated by a single block in FIG. 1 although different input devices can and typically would be associated with the control system. Various kinds of information are entered into the control system through the input devices 41 including, for example, desired strip delivery gauge and temperature, strip entry gauge and width and temperature (by entry detectors if desired), grade of steel being rolled, plasticity tables, hardware oriented programs and control programs for the programming system, and so forth.
  • the principal control action outputs from the automatic gauge control or AGC system include screwdown positioning reference commands which are applied to respective screwdown positioning controls 55 for operating the screwdown motors 29 for screw movement, and speed control signals which are applied to the respective speed and tension control system 53 to cause a change in drive speed to compensate for a change in thickness being made by a screwdown movement.
  • Display and printout devices 51 such as numeral display, tape punch, and teletypewriter systems can also be provided to keep the mill operator generally informed about the mill operation and in' order to signal the operator regarding an event or alarm condition
  • the AGC system operates at predetermined time periods such as every 2/10 second with the screwdown position detector and load cell provided signals from each stand as well as the X-ray gauge error signal to deter mine the respective stand screwdown adjustment control actions required for producing desired strip delivery gauge.
  • the printout devices are also used to log mill data according to computer log program direction.
  • the AGC system uses Hookes law to determine the total amount of screwdown movement required at each roll force controlled stand at the calculating point in time for roll force and gauge error correction, i.e., for loaded roll opening and stand delivery gauge correction to the desired value.
  • the calculation defines the total change in the unloaded roll opening required to offset the guage error causing condition.
  • the on line gauge control system operates the stands to produce strip product having desired gauge and proper shape, i.e., flat with slight crown.
  • On line gauge control is produced by the roll force gauge control loops at the stands and the previously noted X-ray monitor gauge control system.
  • the X-ray gauge 47 produces the X-ray gauge error or deviation signal which indicates the difference between actual strip delivery thickness and desired or target strip delivery thickness.
  • a mill modulus characteistic or mill spring curve defines the separation between a pair of workpiece reducing mill stand work rolls as a function of separating force and as a function of screwdown position.
  • the slope of the mill spring curve 100 is the well known mill spring modulus or constant K which is subject to variation as well known to persons skilled in this art.
  • the workpiece deformation characteristic or reduction curve 102 is shown.
  • the entry gauge H of the workpiece passed through the roll stand is reduced to the indicated delivery gauge H as defined by the intersection of the mill spring curve 100 and the product reduction curve 102 to establish the stand roll force required for the indicated operation.
  • the unloaded roll opening sometimes called the screwdown because of the screw and nut system used for adjusting the roll opening, is the gauge that would be delivered if there were no roll separating force. As the force increases with a constant roll opening, the delivery gauge increases, since the mill deflects as shownby the mill spring curve 100. If no force was exerted on the product being rolled, the gauge would not be reduced and the delivery gauge would be equal to the entrygauge.
  • the delivery gauge is determined by the equilibrium point at which the force exerted by the mill is equal to the force required to deform the product. Changes in entry gauge and product hardness result in a change in roll force and delivery gauge. The automatic gauge control moves the screwdown to correct for these gauge changes.
  • the main advantage of the roll force gauge control system is its ability to detect changes in gauge the instant they take place, as the product is being rolled in the stand. A shift in delivery thickness can be caused by a change in entry thickness or a change in hardness (usually caused by a change in temperature). This change in delivery gauge is immediately detected by monitoring the roll separating force of the roll stand.
  • the stand workpiece delivery gauge H equals the unloaded roll opening as defined by the screwdown position SDREF plus the mill stretch (F*K) caused by the workpiece. If the screwdown calibration is incorrect, i.e., if the number as signed to the theoretical roll facing screwdown position is something other than zero because of roll crown wear or other causes, the stand workpiece delivery gauge H then equals the unloaded roll opening plus the mill stretch, plus or minus the calibration drift.
  • the amount of mill stretch depends on the product deformation characteristic or reduction curve 102 for the workpiece.
  • the reduction curve 102 for a strip of predetermined width represents the amount of force F required to reduce the workpiece from the stand entry gauge (height) H
  • the workpiece plasticity P is the slope of the curve 102, and the curve 102 is shown as being linear although a small amount of nonlinearity would normally exist.
  • Desired workpiece delivery gauge H is produced since the amount of force F required to reduce the workpiece from H to H is equal to the amount of roll separating force required to stretch the rolls to a loaded roll opening Hp, i.e. the intersection of the mill spring curve 100 at an initial screwdown opening SDREF indicated by mill spring curve 100 and the workpiece reduction curve 102 lies at the desired gauge value H
  • the actual stand present gauge I-Ix is not the same as the desired gauge H there is a gauge error GE to be corrected. This condition can be corrected by changing the provided screwdownposition reference SDREF to the stand, such that a new mill spring curve 104 becomes operative to result in the desired gauge H being delivered from the roll stand and the gauge error. GE is now removed.
  • the total stand (N) gauge error GE(N) that it is desired be corrected by screwdown adjustment at stand (N) is equal to the roll force system determined gauge error at stand (N) as modified by the speed correction SC(N) for stand N that is determined at stand N by the following relationship:
  • the speed correction SC(N) is a non-linear adjustment to the measured roll force F(N), in which'the adjustment becomes greater as the change in speed S(N) from the lock on speed LOS(N) becomes greater.
  • the lock on speed LOS(N) was substantially the operational thread speed of the rolling mill stand (N) and the normal run speed was approximately twice the thread speed.
  • the quantity S (N)-LOS(N)/LOS(N) increased in value from zero when the speed S(N)was equal to the lock on speed LOS(N) to one when the speed S(N) was twice the lock on speed LOS(N).
  • the correction factor CF(N) for stand (N) is a multiplier provided to convert the speed correction into units of tons, and may typically have a value between 200 and 400 metric tons depending upon the rolling mill involved.
  • the above equation (10) calculates the exit gauge error of the workpiece strip leaving each individual stand in relation to the roll force and screw position conditions measured for that stand.
  • the normal exit gauge error leaving stand (N) for example, equals the sum of a first quantity, which is the difference between the presently measured screwdown position SD(N) and the initial lock on screwdown position LOSD(N), and a second quantity, which is the determined mill spring modulus I((N) times the difference between the presently measured roll separation force F(N) and the initial lock on roll force LOF(N).
  • the gauge error determined by above equation (10) does not account for the effect of changes in speed.
  • the AGC gauge error equation is modified to contain a term that is a function of the stand rolling speed, as follows:
  • the speed correction SC(N) in the equation (I I) is first determined.
  • step 500 there is a calculation of the change in speed from lock on speed LOS(N), with these values being provided by a digital hardware system that is directly readable by the computer.
  • the computer here reads the present speed S(N) of stand (N) and compares it with the initial lock-on speed LOS(N) for the present workpiece strip.
  • step 502 there is calculated the percentage change in the speed from the lock-on speed, relative to the lock-on speed being 100 percent. It is determined if this percentage is negative at step 504 to see if stand (N) has slowed down below lock-on speed.
  • the percentage is made equal to zero. If it is not negative, at step 506 the percentage is made equal to zero. If it is not negative, at step 508 the percentage is used as an index for the look up of the desired speed correction at step 510.
  • the percentage change in relation to speed lock-on is linearly related or proportional to the speed itself.
  • the speed correction needed here for the control of the process operation is the nature of a nonlinear exponential, so a look up table having about 5 or 6 indices can be provided and it can be indexed by the linear speed percentage.
  • the typical value for the percentage used as an index would be in the order of 10 percent, percent, 30 percent, 40 percent and 50 percent, with the speed correction determined in this manner having a value between 0 correction to 400 correction maximum, which value is in tons metric.
  • the next operation at step 512 is to calculate the change in force F(N) between the present stand N roll force and the initial lock-on force LOF(N). Then at step 514 the speed correction SC(N) is subtracted as a direct correction to this roll force difference.
  • the speed correction SC(N) is utilized as a correction to the force which is related to the speed.
  • the force reading is a function of speed and the look up operation provides the desired relationship between the force reading correction and the speed S(N).
  • a typical minimum speed or speed lockon LOS(N) for the last stand would be 400 meters per minute; the typical maximum speed is about 800 meters per minute, and the minimum desired speed correction is 0 tons and the maximum desired correction is 400 tons.
  • a speed compensation for gauge control is provided in terms of roll force correction as a predetermined relationship to stand speed, since some variable has changed in the gauge control operation.
  • the above gauge error equation (5) becomes somewhat inaccurate when a stand speed changes.
  • the gauge can be proper at one speed but upon a change in the speed at the same roll force and that same screw setting, the delivery gauge will change leaving stand N.
  • the BISRA gauge error equation is affected by speed.
  • the adjusted force is multiplied by the mill spring constant.
  • the change in screw position is subtracted.
  • the determined gauge error GE(N) is stored in memory.
  • the adjusted force is the quantity equal to the present measured force F(N) minus the lock-on roll force LOF(N) minus the speed correction SC(N) for stand N. It should be understood that the here described calculation is made in succession for each stand of the rolling mill.
  • the typical AGC control program is written as a loop operaton such that one set of coding processes all of the roll stands, and every time the program operates through the loop a calculation is made when appropriate for each of the roll stands.
  • Step One Study the workpiece rolling mill and its operation to be controlled, and then establish the desired control system and method concepts.
  • Step Two Develop an understanding of the control system logic analysis, regarding both hardware and software.
  • Step Three Prepare the system flow charts and/or the more detailed programmers flowcharts.
  • SC(N) is the predetermined correction, where S(N) is the present speed of said one roll stand,
  • CF is a predetermined multiplier factor to convert said correction into desired units.
  • SD(N) is the present screwdown position to determine the present roll opening of said one roll stand
  • SC(N) is the speed correction
  • SC(N) [S(N) LOS(N)/LOS(N)] CF where S(N) is the present speed of said one roll stand,
  • CF is a predetermined multiplier factor to convert said correction into desired units.
  • SD(N) is the present screwdown position of said one roll stand

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  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US00303725A 1972-11-06 1972-11-06 Rolling mill gauge control method and apparatus including speed correction Expired - Lifetime US3851509A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE793762D BE793762A (fr) 1972-11-06 Procede et appareil de commande de calibre de laminoir comprenant la correction de vitesse
US00303725A US3851509A (en) 1972-11-06 1972-11-06 Rolling mill gauge control method and apparatus including speed correction
AU50359/72A AU465672B2 (en) 1972-11-06 1972-12-21 Improvements in or relating to rolling mill gauge control method and apparatus including speed correction
FR7300338A FR2205376B1 (zh) 1972-11-06 1973-01-05
JP12408773A JPS5340938B2 (zh) 1972-11-06 1973-11-06

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US00303725A US3851509A (en) 1972-11-06 1972-11-06 Rolling mill gauge control method and apparatus including speed correction

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US (1) US3851509A (zh)
JP (1) JPS5340938B2 (zh)
AU (1) AU465672B2 (zh)
BE (1) BE793762A (zh)
FR (1) FR2205376B1 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706479A (en) * 1983-11-07 1987-11-17 Mitsubishi Denki Kabushiki Kaisha Tandem rolling control system
US5379237A (en) * 1990-05-31 1995-01-03 Integrated Diagnostic Measurement Corporation Automated system for controlling the quality of regularly-shaped products during their manufacture
US5414648A (en) * 1990-05-31 1995-05-09 Integrated Diagnostic Measurement Corporation Nondestructively determining the dimensional changes of an object as a function of temperature

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332263A (en) * 1963-12-10 1967-07-25 Gen Electric Computer control system for metals rolling mill
US3365920A (en) * 1963-09-02 1968-01-30 Hitachi Ltd Control apparatus for tandem rolling mills
US3561237A (en) * 1967-11-29 1971-02-09 Westinghouse Electric Corp Predictive gauge control method and apparatus for metal rolling mills
US3600920A (en) * 1967-10-23 1971-08-24 Westinghouse Electric Corp Screwdown offset system and method for improved gauge control
US3704609A (en) * 1971-06-25 1972-12-05 Westinghouse Electric Corp Rolling mill gauge control during acceleration
US3733866A (en) * 1970-06-18 1973-05-22 Nippon Kokan Kk Method of controlling a continuous hot rolling mill
US3740983A (en) * 1972-02-29 1973-06-26 Westinghouse Electric Corp Automatic gauge control system for tandem rolling mills
US3763677A (en) * 1971-03-19 1973-10-09 Hitachi Ltd Automatic plate-thickness control method for rolling mill

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3139571A (en) * 1970-08-13 1973-01-25 Gen Electric Controlling delivery gage in a metals rolling mill

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3365920A (en) * 1963-09-02 1968-01-30 Hitachi Ltd Control apparatus for tandem rolling mills
US3332263A (en) * 1963-12-10 1967-07-25 Gen Electric Computer control system for metals rolling mill
US3600920A (en) * 1967-10-23 1971-08-24 Westinghouse Electric Corp Screwdown offset system and method for improved gauge control
US3561237A (en) * 1967-11-29 1971-02-09 Westinghouse Electric Corp Predictive gauge control method and apparatus for metal rolling mills
US3733866A (en) * 1970-06-18 1973-05-22 Nippon Kokan Kk Method of controlling a continuous hot rolling mill
US3763677A (en) * 1971-03-19 1973-10-09 Hitachi Ltd Automatic plate-thickness control method for rolling mill
US3704609A (en) * 1971-06-25 1972-12-05 Westinghouse Electric Corp Rolling mill gauge control during acceleration
US3740983A (en) * 1972-02-29 1973-06-26 Westinghouse Electric Corp Automatic gauge control system for tandem rolling mills

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706479A (en) * 1983-11-07 1987-11-17 Mitsubishi Denki Kabushiki Kaisha Tandem rolling control system
US5379237A (en) * 1990-05-31 1995-01-03 Integrated Diagnostic Measurement Corporation Automated system for controlling the quality of regularly-shaped products during their manufacture
US5414648A (en) * 1990-05-31 1995-05-09 Integrated Diagnostic Measurement Corporation Nondestructively determining the dimensional changes of an object as a function of temperature
US5608660A (en) * 1990-05-31 1997-03-04 Integrated Diagnostic Measurement Corp. Automated system for controlling the quality of geometrically regular-shaped products during their manufacture

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AU5035972A (en) 1974-06-27
FR2205376A1 (zh) 1974-05-31
BE793762A (fr) 1973-07-09
JPS4978661A (zh) 1974-07-29
JPS5340938B2 (zh) 1978-10-30
FR2205376B1 (zh) 1977-12-30
AU465672B2 (en) 1974-06-27

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