US3709008A - Gauge control method and apparatus for metal rolling mills - Google Patents

Gauge control method and apparatus for metal rolling mills Download PDF

Info

Publication number
US3709008A
US3709008A US00080682A US3709008DA US3709008A US 3709008 A US3709008 A US 3709008A US 00080682 A US00080682 A US 00080682A US 3709008D A US3709008D A US 3709008DA US 3709008 A US3709008 A US 3709008A
Authority
US
United States
Prior art keywords
gauge
stand
correction
rolling stand
roll
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
US00080682A
Other languages
English (en)
Inventor
A Smith
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Application granted granted Critical
Publication of US3709008A publication Critical patent/US3709008A/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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions

Definitions

  • the gauge [22] Filed: Oct 14 1970 control program determines in relation to the magnitude of the delivery gauge error and related roll [2]] Appl. No.: 80,682 opening correction for the same one stand that this delivery gauge error is to be corrected by adjustment of the roll opening of that same one stand or is to be (gill. fed forward in the direction of the workpiece Strip 58 7 21 28 movement for correction in a succeeding stand of the 1e care rolling mm by adjustment of the to" opening of the succeeding stand.
  • the roll opening correction is effec [56] References cued tive to adjust the latter stand operation for a time in- UNITED STATES PATENTS terval related to the movement of the workpiece strip increment fromthe stand where the gauge error 1S 2,883,895 4/1959 Vossberg ..72/9 measured to the following correction stand of the 3,32 ,21 3
  • FIG. 5A 0 .oos-- 35:. $55 ztoozwmum my .m 0 w v WUIOQZ GOEEU M0340
  • FIG. 5C
  • PATENTEDJAN 9 I973 SHEET 0 0F 12 UNLIMITED GAUGE CONTROL STAND 2 m N 5 5 E s 4 1.3% N o R 8 2 w l w L u 1 u m vm m m o m m m memo. jom 6 .czamwa mute:- m 324:0 zsooxuzum G F C 8 w I50 c E s 1 2 mm 0 O Mu K m w w m.
  • the present invention relates to metal rolling mills and more particularly to roll force gauge control systems and methods used in operating such mills.
  • the unloaded roll opening and the speed at each tandem mill stand or for each reversing mill pass are set up by an operator or by a programmed digital computer control system to produce successive workpiece reductions .resulting in delivered work product at the desired gauge.
  • the loaded roll opening at a given roll stand equals the stand delivery gauge or thickness on the assumption that there is little or no elastic workpiece recovery.
  • the roll force gauge control slave system disclosed in U.S. Pat. No. 3,357,2l7 did not include a roll force feedback gauge control system on the correction stand N+l so the only gauge error signal applied to this correction stand N+l was the feed forward gauge error signal from the previous measurement stand N.
  • the gauge error measured at stand N was continuously applied for adjusting the roll opening of stand N and adjusting the roll opening of the following slave stand N+l.
  • the present invention determines a gauge error related screwdown correction in accordance with a sensed work strip gauge error at a selected measurement stand N and feeds that determined gauge error screwdown correction forward in the direction of strip travel to a succeeding stand, such as the next adjacent stand N+l, and applies the screwdown correction for a determined time duration to adjust the operation of that succeeding stand N+l for correcting the gauge error sensed at the previous measurement stand N.
  • This determined time duration is established in relation to the magnitude of screwdown correction in stand N used to initiate such corrections in the N+l stand and the speed of the screwdown system. Once the portion of the strip requiring a large correction has reached the next stand, the feed forward correction is no longer needed.
  • This screwdown correction is fed forward to the next succeeding stand N+l, for the time duration determined by the control program, with the ON beginning and OFF termination of that time duration being determined, after which the screwdown correction is removed from the control of the succeeding stand N+l.
  • the transport time is the time interval required for a given portion of the work strip to travel from that measurement stand N to the next succeeding correction stand N+l.
  • the screwdown correction fed forward from stand N no longer is needed to control the operation of the succeeding correction stand N+l since the gauge error detected at stand N is now sensed in stand N+l.
  • this gauge error is fed forward in anticipation of the work strip increment containing the sensed gauge error arriving at the next successive roll stand.
  • the gauge error measured at stand N determines the screwdown correction which is applied in full to correct the operation of stand N in the usual roll force automatic gauge control approach relative to stand N.
  • the full screwdown correction is also applied to the following slave stand N+l for a determined time duration.
  • the correction stand corresponding to the work strip gauge error measured at stand N is passed through effective dead band limits, such that a predetermined minimum gauge error must occur before an error correction signal is applied to the following stand N+l.
  • the present control system locks in on the determined screwdown correction to remove the gauged error for a time interval determined by the decrementing of a signal counter provided within the control system and in relation to the physical travel of the gauge error containing work strip increment from the measurement stand N to the correction stand N+ l
  • the present control system then again locks in on the next determined screwdown correction for the gauge error at measurement stand N and the same gauge error correction operation is repeated successively as necessary in accordance with the sensing ofa gauge error at measurement stand N greater than the provided dead band signal limits.
  • the roll force gauge control response speed for a given roll stand depends principally on the system gain of the roll force gauge control, that is the rate of control screwdown movement per unit of detected roll force error. Since the stand delivery gauge is determined by the intersection point of the mill spring curve (roll force versus roll opening) and the workpiece deformation curve (yield force versus thickness reduction), the total amount of the screwdown movement required to correct a roll force error and the associated workpiece gauge error depends primarily on the mill spring modulus and the workpiece plasticity. The workpiece plasticity and the mill spring modulus thus affect the rate at which screwdown corrective control actions should be applied which is the system gain.
  • FIG. 1 is a schematic illustration of a tandem hot strip metal rolling mill and a digital computer system operative for operational control of the rolling mill, including workpiece gauge control, and arranged in aceordance with the principles of the present invention
  • FIG. 2 illustrates a typical spring curve and workpiece deformation eurve relationship
  • FIG. 4 illustrates the determination of a screwdown correction to remove the gauge error at a roll stand N
  • FIGS. 5A, 5B and 5C illustrates the response of a gauge control system of the first roll stand as a skid mark in the workpiece is passing through that first roll stand;
  • FIGS. 9A, 9B and 9C illustrates the gauge error correction resulting from a feed forward of the determined screwdown correction relative to a workpiece gauge error detected at the first roll stand to control the operation ofthe succeeding second roll stand;
  • FIGS. 12A and 12B illustrates the technique used to modify an overlap of a DOWN screwdown correction followed by an UP screwdown correction to avoid such an overlap in the control operation
  • FIG. 13 illustrates the determination that an increasing negative screwdown correction is taking place such as is the operation at program step 8 in the program flow chart.
  • FIG. 14 shows a functional block diagram to illustrate the operation ofthe present gauge control system.
  • FIG. I DESCRIPTION OF THE PREFERRED EMBODIMENT
  • a digital computer system 12 DESCRIPTION OF THE PREFERRED EMBODIMENT
  • the invention is applicable to various types of mills in which roll force gauge control is employed.
  • the invention can be suitably adapted for application in hot steel plate reversing and other rolling mills.
  • the tandem mill 10 includes a series of reduction rolling stands S1 through S7 with only four of the stands S1, S2, S3 and S7 shown.
  • a workpiece 14 enters the mill 10 at the entry end in the form of a bar and it is elongated as it is transported through the successive stands S1 through S7 to the delivery end of the mill where it is coiled as a strip on a down coiler.
  • the entry bar would be of known steel grade and it typically would have a thickness of about 1 inch and a width within some limited range such as 20 inches to inches.
  • the delivered strip would usually have approximately the same width and a delivery gauge or thickness based upon the production order for which it is intended.
  • the successive stands operate at successively higher speeds to maintain proper workpiece flow.
  • 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 28 with only one being shown in FIG. 1 at each stand position respective screwdowns 30 which clamp against opposite ends of the backup rolls and thereby apply pressure to the work rolls 22 and 24.
  • the two screwdowns 30 at a particular stand would be in identical positions but they can be located at different positions for strip guidance during threading or for other purposes.
  • an electric motor driving a screwdown mechanism 30 to control the stand roll opening can be replaced by a hydraulic positioning servo system or a hydraulic motor operative with a screwdown mechanism if desired.
  • a conventional screwdown position detector 32 provides an electrical signal representation of the screwdown controlled roll opening position at each roll stand. To provide an absolute correspondence between the screwdown position and the unload roll opening between the associated work rolls a screwdown position detection system which includes the screwdown position detector 32 can be calibrated from time to time as desired.
  • Roll force detection is provided at each of predetermined stands by a conventional load cell 34 and in many cases stands without roll force gauge control would also be equipped with such load cells.
  • the number of stands to which roll force gauge control is applied is predetermined during the mill design in accordance with cost and performance standards, and increasingly there is a tendency at the present time to apply roll force gauge control to all of the stands in a tandem hot strip steel mill.
  • a roll force gauge control system is employed at each of the seven stands 81 through S7.
  • the digital computer system 12 can provide automatic control for the operation of the tandem mill 10 as well as desired preceding production processes not illustrated, such as the operation of a roughing mill.
  • the digital computer system comprises a programmed process control digital computer 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 10.
  • the computer 12 can also include conventional manual and/or automatic analog controls for backup operation in performing preselected mill functions.
  • the digital computer system 12 can include a central integrated process control or set up processor with associated input/output equipment, such as that included in the computer system known as the Prodac 2000 (P-2000) currently sold by the Westinghouse Electric Corporation.
  • the P-ZOOO processor typically uses an integral magnetic core 20,000 word (16 bit) memory with nominal 3.0 microsecond cycle time.
  • the computer processor is associated with predetermined input systems not specifically illustrated which typically can include a conventional contact closure input system to scan contact or other signals representing the status of various process conditions, a conventional analog input system which scans and converts process analog signals, an operator controlled and other information input devices 38 such as paper tape, teletypewriters and dial input devices. It is noted that the input devices 38 are indicated by a single block in FIG. 1 although different input devices can and typically would be associated with the one or more digital computers in the digital computer system 12.
  • Various kinds of input information are entered into the digital computer system 12 through the input devices 38 including for example desired strip delivery gauge from the rolling mill and workpiece temperature, workpiece strip entry gauge and width by entry detectors if desired, grade of steel being rolled, any selected workpiece plasticity tables, hardware oriented programs and control programs for the programming system, and so forth.
  • the contact closure input system and the analog input system interface the digital computer system 12 with the process through the medium of measured or detected variables.
  • the present invention is largely involved in the functioning of the automatic gauge control computer system hereinafter referred to as the AGC computer.
  • various mill signals are applied to the AGC computer input system.
  • mill signals include the following: (I) a roll force signal from the load cell 34 and each of roll stands S1 through S7 proportional to the respective stand roll separating force for use in predictive feed forward roll force gauge control; (2) 14 bit screwdown position signals generated by the respective screwdown position detectors 32 at the stands S1 through S7 for use in predictive feed forward roll force gauge control; (3) position signals from respective loopers 52 for use in looper tension control; (4) stand speed signals generated by respective tachometers 54 with the stand S7 speed signal and/or other stand speed signal being used for calculation of the stand mass flow speed relationships for the X-ray gauge monitor operation; (5 a gauge deviation signal from the X-ray gauge 56 at the delivery end of the mill for programmed monitoring gauge control through the predictive roll force control; (6) an entry temperature signal from a mill entry tempe rature detector (not shown); if references are provided by the set up computer operation, the mill entry temperature for a first workpiece is stored and screwdown compensation is made for subsequent workpieces if the temperature difference of those subsequent workpieces is determined
  • the measured head end roll force at each roll stand can be stored and used as a reference for roll force gauge controlled functioning at the respective stands if the AGC computer is in the lock on mode of roll force operation. On the other hand if the AGC computer is in the absolute mode of roll force operation, the set up computer operation calculates a predicted head end roll-force at each stand which is used as an absolute reference for roll force gauge control functioning.
  • Various process data input signals are coupled to the AGC computer through the contact closure input system and can include a strip in stand signal based on the load cell outputs which enable the roll force gauge controls to function.
  • a contact closure output, system would normally be associated with the digital computer system 12.
  • contact closure output systems are respectively associated with the various control devices operated in response to control actions calculated or determined by execution of the control programs in the AGC computer.
  • control devices are operated directly by means of output system contact closures or by means of analog signals derived from output system contact closures through a digital to analog converter.
  • the principal control action outputs from the AGC computer contact closure output system includes screwdown positioning system commands which are applied to respective screwdown controls 58 in operating the screwdown motors 28 for the screwdown movement, and speed anticipate signals which are applied to various looper tension control systems to cause a change in drive speed to compensate for a change in thickness being made by a screwdown movement.
  • Display and printout systems here illustrated as output devices 62 such as a numerical display tape or teletypewriter systems are also associated with the outputs of the digital computer system 12 in order to keep the mill operator generally informed about the mill operation, and in order to signal the operator regarding an event or alarm condition which may require some action on his part.
  • the printout systems are also used to log mill data according to computer log program direction.
  • a multi-stand, continuous, hot strip rolling mill at the present time employs a roll force gauge control system to maintain desired delivery workpiece gauge.
  • a hot strip rolling mill will roll a single workpiece strip simultaneously in all of its stands. Therefore the workpiece gauge controlsystem used with the rolling .mill should be able to detect gauge errors in the workpiece strip as quickly as possible, and the gauge control system should be able to make appropriate roll opening corrections in as many roll stands as may be necessary.
  • the two workpiece gauge error detection systems most commonly used at the present time are the X-ray and the roll force systems.
  • a practical combination of the two gauge error detection systems is to use roll force error feedback information to calculate fast roll opening corrections to correct the sensed fluctuations in gauge, and to use one X- ray gauge device positioned after the last roll stand to evaluate the absolute gauge or thickness of the workpiece strip coming out of the last roll stand.
  • the fast roll opening corrections are calculated from the roll force error feedback information to indicate the change in stand roll force AF, combined with the stand screwdown position change ASD and the known mill spring modulus K of the rolling stand, in accordance with the well known relationship
  • the slower X-ray gauge device evaluation is used to calculate simultaneous roll opening corrections to monitor the operation of several roll force gauge controlled stands so that the absolute value of the workpiece gauge leaving each such roll stand can be brough to the desired value.
  • FIG. 2 shows the linear approximations of the mill spring deflection as shown by curve 200 and the workpiece product deformation as shown by curve 202 in a typical rolling mill stand.
  • the unloaded roll opening SD sometimes called the screwdown because of the screw and nut system that can be used for adjusting the roll opening, is the same as the workpiece delivery gauge that would be delivered if there were no roll separating force.
  • the workpiece delivery gauge increases, since the mill stand stretches or deflects.
  • This is shown by the curve 200 with slope l/k, where the mill spring modulus K ASD/F 2.
  • the product deformation or plasticity characteristic P is represented by the curve 202 with slope l/P, where workpiece plasticity P ASD/F 3.
  • the gauge would not be reduced and the delivery gauge from the roll stand would be equal to the entry gauge. If the roll force is .caused to increase, the product is plastically deformed and the delivery gauge decreases.
  • The, inverse slope of the mill characteristic curve 200 is the mill spring modulus K having the units of inches per 10 lbs.
  • the inverse slope of the product characteristic 202 is the product plasticity P having the units of inches per million pounds.
  • the workpiece delivery gauge is determined by the equilibrium point 204 where the roll force exerted by the roll stand is equal to the force required to deform the product. Changes in workpiece entry gauge and/or changes in workpiece product hardness result in a change in roll force and the workpiece delivery gauge. The gauge control must move the screwdown to adjust the roll opening of the roll stand to correct for these changes in workpiece delivery gauge.
  • a shift in workpiece delivery gauge or thickness can be caused by a change in workpiece entry gauge, or a change in workpiece hardness (usually caused by change in workpiece temperature); this change in delivery gauge can be immediately detected by monitoring the roll separating force of the roll stand.
  • the initial or lock on screwdown position SDLO(N) and lock on roll separating force FLO(N) are measured to establish what workpiece delivery gauge should be maintain out of that stand (N).
  • the instantaneous roll separating force F(N) and screwdown SD(N) are periodically monitored and any change in roll separating force F(N) FLO(N) is detected and compensated for by a corresponding change in screwdown position SD(N) SDLO(N).
  • the lock-on delivery gauge GLO(N) for stand N is equal to the lock-on screwdown SDLO(N) plus the lock-on force FLO(N multiplied by the known mill 'spring modulus K(N).
  • Equation 5 shows the delivery gauge G(N) at any time during the rolling is equal to the screwdown position SD(N) plus the roll separating force F(N) multiplied by the mill spring modulus K(N).
  • the gauge error GE(N) shown in equation 6 is derived by substracting the lock-on gauge equation 4 from the gauge equation 5.
  • FIG. 3 illustrates the operation of a roll force gauge error detection system, with the dotted mill spring curve 201 and the dotted product plasticity curve 203 representing the head-end operation lock-on conditions and the respective solid line curves 200 and 202 representing the present or instantaneous operation condition.
  • the stand screwdown controlled roll opening SD(N) as shown in FIG. 3 has moved in the opening direction and the. roll separating force F(N) has increased compared to the lock-on force FLO(N), probably because of a hard and cold portion of the workpiece strip now passing through the roll stand N.
  • FIG. 5 shows the response of the gauge controlsystem on the first stand of a rolling mill as a skid mark is passing through the mill stand.
  • the top curve shows the per unit roll separating force plotted against time.
  • the gauge error is detected immediately, but the first stand screwdown system is unable to make any appreciable movement for almost one-half a second.
  • the screwdown system is unable to bring the workpiece delivery gauge back to the desired value until after more than half the skid mark has passed through the mill stand and the screwdown of that stand is running at maximum speed in the down direction. Before the stand screwdown system can be reversed and brought back to its desired on gauge position, a considerable amount of light gauge workpiece product is rolled.
  • FIG. 6 shows the conditions in the second roll stand of the rolling mill when this same skidmark'containing workpiece portion arrives about 1.5 seconds later. Even more light gauge strip is rolled because of the over correction of the relatively slow screwdown system of the second stand.
  • the illustrations show how the roll force rises and falls, and how the screw position correction takes place to try to remove thaterror, and the resulting gauge error that goes heavy before an adequate screw movement can be effected.
  • the screws are then moving either down or up in a direction, as desired for proper error correction at a high rate when the gauge error is removed and in fact overshoot some before they can be stopped.
  • This is a good illustration of why the feed forward concept is required, since the screws of a given stand cannot follow the disturbances; if the screws are permitted to try to correct for the gauge error disturbances present in the work strip, they will overcorrect by getting up to a high speed of corrective operation and then cannot be stopped in time to avoid some overshoot in error correction position.
  • FIG. 9 shows one example of the results of this type of error anticipation gauge control.
  • the particular gauge error detection system for stand (N) looks at the gauge error leaving stand (N). Assume that stand (N) is spaced from stand (N+l) by a distance of 18 feet, and the workpiece is moving from stand (N) to stand (N+l) at a speed of 600 feet per minute.
  • the screwdown mechanism of stand N takes action at 0.2 seconds because of a continuing rising high gauge condition as shown in FIG. 7. Since the transport time delay from stand (N) to stand (N+1 is 1.6 seconds, this gauge error containing portion of strip is expected to arrive at stand (N+1 at 1.8 seconds and stand (N+l) applies a DOWN correction for 0.8 of a second in the downward direction. This means that the screwdown system of stand (N+l) goes DOWN, starting at 1 second and continuing to 1.8 seconds, in anticipation of the heavy gauge error from stand (N) arriving at that stand (N+l). Similarly, a light gauge rising error was detected in stand (N) at 1.5 seconds causing an UP correction at stand (N+l) from 2.3 seconds until 3.1 seconds. This causes some slight under gauge prior to the arrival of the gauge error at stand (N+l) and some overshoot after the gauge error leaves stand (N+l but the peaks of the gauge errors are reduced.
  • FIG. 10 illustrates the well known roll stand screwdown controlled roll opening adjustment characteristics which permit a determination of response time required to make a desired roll opening adjustment ofa given roll stand.
  • Four typical distance vs. speed curves for different acceleration rates show the time required (dotted lines) and the speed reached for various screwdown moves starting at zero speed.
  • the screwdown system on the following stand can be moved in anticipation of the error arriving at the following stand.
  • the following stand screwdown positioning system is given a large correction to achieve maximum speed of correction.
  • the automatic gauge control program of the present invention as illustrated by the program flow chart shown in FIG. 11 is indexed from the first stand through the last stand and is run through every 0.2 second, as determined by a well known synchronizer interrupt subroutine within the digital computer system 12 of FIG. 1.
  • the gauge error GE for stand N and desired screwdown correction DELS for stand N to remove that gauge error are determined at program step 1 by measuring the change in roll force from the lock-on value FLO(N) to the present value F(N) and the change in screwdown position from the lock-on value SDLO(N) to the present value SD(N), and converting through a predetermined relationship of these values into a gauge error GE, using the known mill spring modulus K(N) for stand N.
  • the gauge error GE is converted into a stand (N) screwdown correction DELS(N), by multiplying the gauge error GE by a gain factor K(N)/P(N) 1, which is a predetermined function of the mill spring modulus K(N) and the workpiece plasticity P(N) for the roll stand N, as set forth in above equation (12). Both K(N) and P(N) are in units of inches per 10 lbs. for this purpose.
  • This screwdown correction DELS is stored in a temporary location TEMP for use during the next part of this same gauge control program, where comparisons are made with previously established values for the stand N screwdown correction, during the last previous run or scan through this same gauge'control program.
  • Program steps 2 and 6 determine if the incremental screwdown correction DELS is greater than predetermined limit values, for example, i 0.005 inch.
  • step 4 finds that the present and positive screwdown correction is continuing to rise in magnitude as compared to the last previous such correction, this comparison indicates that a correction should be anticipated for the next stand (N+l).
  • step 5 a check is made to see if an earlier correction is already in progress for stand (N+l), as indicated by the ON time for the UP screwdown correction ONU (N+l) being set equal to 1,000.
  • step 13 the necessary timing is set up for feeding a desired correction to the next stand (N+l) in anticipation of this sensed large, rising and positive screwdown correction which is anticipated in the next stand (N+1).
  • the effective screwdown corrections which are fed to the next stand (N+l) are controlled by application internal timing values.
  • the predetermined application interval timing values can typically be the following in terms of seconds duration of the applied anticipate gauge error screwdown correction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US00080682A 1970-10-14 1970-10-14 Gauge control method and apparatus for metal rolling mills Expired - Lifetime US3709008A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8068270A 1970-10-14 1970-10-14

Publications (1)

Publication Number Publication Date
US3709008A true US3709008A (en) 1973-01-09

Family

ID=22158945

Family Applications (1)

Application Number Title Priority Date Filing Date
US00080682A Expired - Lifetime US3709008A (en) 1970-10-14 1970-10-14 Gauge control method and apparatus for metal rolling mills

Country Status (6)

Country Link
US (1) US3709008A (enrdf_load_stackoverflow)
JP (1) JPS5144895B1 (enrdf_load_stackoverflow)
BE (1) BE773916A (enrdf_load_stackoverflow)
BR (1) BR7106795D0 (enrdf_load_stackoverflow)
CA (1) CA950082A (enrdf_load_stackoverflow)
ES (1) ES395948A1 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841122A (en) * 1972-11-06 1974-10-15 Westinghouse Electric Corp Rolling mill gauge control method and apparatus including feedback correction
US3841123A (en) * 1972-11-06 1974-10-15 Westinghouse Electric Corp Rolling mill gauge control method and apparatus including entry gauge correction
US3996776A (en) * 1974-03-05 1976-12-14 Gec-Elliott Automation Limited Strip thickness control
US4415976A (en) * 1981-04-28 1983-11-15 Westinghouse Electric Corp. Method and apparatus for automatic mill zero correction for strip width

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940477A (ja) * 1982-08-31 1984-03-06 株式会社東芝 差込みプラグ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883895A (en) * 1954-10-15 1959-04-28 Carl A Vossberg Rolling mill thickness control system
US3355918A (en) * 1965-05-12 1967-12-05 Westinghouse Electric Corp Gauge control system providing improved gauge accuracy in a reduction rolling mill
US3448600A (en) * 1967-02-01 1969-06-10 Gen Dynamics Corp Thickness reduction control system
US3553991A (en) * 1968-04-30 1971-01-12 Industrial Nucleonics Corp Nonlinear controller

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416399A (en) * 1966-07-28 1968-12-17 Giovanni E. Baldoni Reinforced guitar neck

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883895A (en) * 1954-10-15 1959-04-28 Carl A Vossberg Rolling mill thickness control system
US3355918A (en) * 1965-05-12 1967-12-05 Westinghouse Electric Corp Gauge control system providing improved gauge accuracy in a reduction rolling mill
US3357217A (en) * 1965-05-12 1967-12-12 Westinghouse Electric Corp Slave gauge control system for a rolling mill
US3448600A (en) * 1967-02-01 1969-06-10 Gen Dynamics Corp Thickness reduction control system
US3553991A (en) * 1968-04-30 1971-01-12 Industrial Nucleonics Corp Nonlinear controller

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841122A (en) * 1972-11-06 1974-10-15 Westinghouse Electric Corp Rolling mill gauge control method and apparatus including feedback correction
US3841123A (en) * 1972-11-06 1974-10-15 Westinghouse Electric Corp Rolling mill gauge control method and apparatus including entry gauge correction
US3996776A (en) * 1974-03-05 1976-12-14 Gec-Elliott Automation Limited Strip thickness control
US4415976A (en) * 1981-04-28 1983-11-15 Westinghouse Electric Corp. Method and apparatus for automatic mill zero correction for strip width

Also Published As

Publication number Publication date
JPS5144895B1 (enrdf_load_stackoverflow) 1976-12-01
BR7106795D0 (pt) 1973-05-17
BE773916A (fr) 1972-04-14
ES395948A1 (es) 1974-09-16
CA950082A (en) 1974-06-25

Similar Documents

Publication Publication Date Title
US3574280A (en) Predictive gauge control method and apparatus with adaptive plasticity determination for metal rolling mills
US4274273A (en) Temperature control in hot strip mill
US3531961A (en) Method and system for controlling strip thickness in a tandem reduction mill
US3694636A (en) Digital computer process control with operational learning procedure
US3561237A (en) Predictive gauge control method and apparatus for metal rolling mills
US3604234A (en) Temperature control system for mill runout table
US3905216A (en) Strip temperature control system
US3574279A (en) Predictive gauge control method and apparatus with automatic plasticity determination for metal rolling mills
US3507134A (en) Interstand tension control for tandem cold rolling mills
US4760723A (en) Elongation control system
US3938360A (en) Shape control method and system for a rolling mill
KR870001491B1 (ko) 금속의 압연방법
US3709008A (en) Gauge control method and apparatus for metal rolling mills
US3603124A (en) Computer control system for rolling metal strips using feed-forward and prediction
US3564882A (en) Rolling mill control system
US3618348A (en) Method of controlling rolling of metal strips
US3702071A (en) Gauge control method and apparatus for metal rolling mills
US3802236A (en) Gauge control method and apparatus including workpiece gauge deviation correction for metal rolling mills
US3841123A (en) Rolling mill gauge control method and apparatus including entry gauge correction
US3820366A (en) Rolling mill gauge control method and apparatus including temperatureand hardness correction
US3592030A (en) Rolling mill stand screwdown position control
US3782153A (en) Method and system for controlling a tandem rolling mill
US3869892A (en) Feed forward gauge control system for a rolling mill
US4126026A (en) Method and apparatus for providing improved automatic gage control setup in a rolling mill
US3600920A (en) Screwdown offset system and method for improved gauge control