US3650135A - Control for rolling means having successine rolling stands - Google Patents

Control for rolling means having successine rolling stands Download PDF

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US3650135A
US3650135A US832571A US3650135DA US3650135A US 3650135 A US3650135 A US 3650135A US 832571 A US832571 A US 832571A US 3650135D A US3650135D A US 3650135DA US 3650135 A US3650135 A US 3650135A
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rolling
stand
stock
last
roll gap
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Charles Roger Skelton
Dalip Tarachand Malkani
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British Iron and Steel Research Association BISRA
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British Iron and Steel Research Association BISRA
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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
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process

Definitions

  • ABSTRACT Primary ExaminerMilton S. Mehr Att0rney-Bacon & Thomas [57] ABSTRACT
  • the rolling is carried out in at least two passes and the rolling operation is controlled by adjusting at least one of the following four parameters: roll speed and screwdown of the first of the passes; roll speed and screwdown of the second of the passes, in response to at least one of: direct stock measurement; direct mill measurement; indirect stock measurement; indirect mill measure- 12 Claims, 14 Drawing Figures C221 26 cm ROD/14575? fwd/73 PATENTEUMARZI I972 3,650,135
  • This invention relates to the rolling of relatively thick metal stock.
  • Such stock may be material in bloom billet, rod, bar or like form which generally has thickness of the same order as width and the invention is concerned with the problem of rolling of such stock to a desired cross section.
  • Such stock is to be distinguished from stock in the form of strip, plate and sheet the thickness of which is relatively small and of an order of magnitude lower than the width.
  • a method of rolling stock other than stock having, in a cross section transverse the length of the stock, one dimension which is small compared with, and of an order of mag nitude lower than, another dimension normal to said one dimension, said method involving subjecting the stock to at least two passes for producing stock on the discharge side of the last of the two passes having a cross section substantially the same as a desired cross section, the method comprising controlling the rolling operation to produce said desired cross section stock by adjusting at least one of the following parameters: roll speed of the penultimate of the two passes; screwdown of the penultimate of the two passes; roll speed of the last of the two passes; screwdown of the last of the two passes; in response to at least one of: direct stock measurement; direct mill measurement; indirect stock measurement; indirect mill measurement.
  • a rolling mill for rolling stock other than stock having, in a cross section transverse the length of the stock, one dimension which is small compared with, and of an order of magnitude lower than, another dimension normal to said one dimension
  • said mill comprising means providing at least two passes for producing stock on the discharge side of the last of the two passes having a cross section substantially the same as a desired cross section, and means for adjusting at least one of the following parameters: roll speed of the penultimate of the two passes; screwdown of the penultimate of the two passes; roll speed of the last of the two passes; screwdown of the last of the two passes, in response to at least one of: direct stock measurement; direct mill measurement; indirect stock measurement; indirect mill measurement to thereby control the rolling operation to produce said desired cross section stock.
  • constant roll gap system or constant gap system is used herein this term refers to a system like that described in our British Pat. No. 692,267.
  • Both the solution in the said British Pat. No. 1,150,073 and the solution of the present application require the stock to pass through means providing two rolling mill passes.
  • the passes may be provided by successive rolling mill stands, alternatively, a reversing mill may provide the passes.
  • the second of the two passes may be the last pass of a sequence or, alternatively, it may be followed by a further pass, or passes.
  • T lnterstand tension
  • V Stock velocity
  • R A reference signal used to set the required roll gap in a mill stand incorporating a constant roll gap control system as described herein.
  • the lower case symbol signifies a small change in the corresponding upper case symbol.
  • the suffix convention adopted is such that if a symbol has one suffix then that suffix refers to the stand number. If a symbol has two suffixes then the first suffix refers to the stand, while the second denotes whether the quantity occurs before the stand (0) or after it (1 This suffix convention does not apply to the symbols denoting co-efficients.
  • the co-efficients can be calculated for rolling conditions in which a round rod is rolled in an oval pass and then in a second, round, pass, the rolling being alternately horizontal-vertical, (i.e., the axes of the rolls on stand 2 at to those on the first stand).
  • Experiments are first conducted to establish the steady state standard conditions. Then small perturbations, each in turn, are made in H W 6,, S S N, and N and the effects of these perturbations on H W 0,, .0 V and T are measured in each case; it will be apparent that the co-efiicients in equations (i) to (viii) can then be evaluated. Similarly, the effects on any other output variables may be measured if required. It must be emphasized that the results so obtained apply to the particular mill and the particular initial steady state rolling conditions for which they are obtained.
  • Equation (vi) is used as a means of indicating which combinations produce acceptable tension changes if two controls only are used, and with three controls supplies the third necessary equation to solve for three unknowns if reasonable values of t are assumed.
  • Equations (i) and (ii), with the known values for the co-efficients a, b, c, d, etc., can be used to predict the necessary screw changes on stands 1 and 2 in order to eliminate the effects of the input errors and produce out-going stock with the same dimensions as the steady state standard.
  • Equations (i) AND (ii) may be written as:
  • the two output dimensions, 11,, and W can only be controlled simultaneously by making simultaneous changes to at least two of the mill settings e.g., two screws, one screw and speed or two speeds.
  • Equations (ix) and (x) may be written as:
  • the desired values of s, and s: which will give zero values of h and w may be predicted by solving equations (xiii) and (xiv) for h,, w 0.
  • each of equations (xxi), (xxii), (xxv) AND (xxvi) would include an additional term which can be determined by use of equation (vi), in addition to equations (i) and (ii).
  • FIGS. 1 to 8 in which like reference numerals indicate like parts.
  • FIG. 1 shows calculating apparatus for evaluating the right hand sides of equations (xxi) and xxii) so as to give the changes in screwdown on stands 1 and 2 necessary to reduce the output height and width errors to zero.
  • FIGS. 2 and 3 each show such calculating apparatus controlling two stands of a rolling mill according to the invention.
  • FIGS. 4 to 8 illustrate schematically rolling schemes which are at present believed to be particularly important embodiments of the present invention.
  • FIG. 1 output height and width errors are shown 2592s nowadays I9.
  • Em ts The ile k s a s in screwdown on stands 1 and 2 necessary to reduce the output height and width errors to zero are shown emanating from terminals 11.
  • the values of the resistances 12, 13, 14 and 15 are chosen relative to the values of the resistances 16 and 17 to give the values as calculated by experiment of the coefiicients jh h h, and h
  • the summation of the products h h and k w and the summation of the products j h and k w are achieved by means of the operational amplifiers 18 and 20 respectively.
  • FIG. 1 accordingly shows how signals representing the desired screw setting changes to eliminate output stock errors h and W can be obtained in a simple manner.
  • FIGS. 2 and 3 show the rolling mill comprising a first stand 21 and a second stand 22.
  • the stock for example rod, is indicated at 23 and travels in the direction of the arrow A.
  • the roll pass of stand 21 is oval in cross section and the roll pass of stand 22 is round in cross-section.
  • the axes of the rolls of stands 21 and 22 are all horizontal.
  • twist guides of known form and located between the stands 21 and 22 cause the rod 23 to be twisted through 90 between stands 21 and 22.
  • the roll axes of the stand 21 may be horizontal and the roll axes of the stand 22 vertical.
  • FIG. 2 shows one method of using the signals as computed in FIG. 1 to actuate the desired screw changes on stands 21 and 22.
  • Errors in output stock height and width are measured by a rod, or bar, meter shown generally at 24 and having channels 25 and 26.
  • the signal carried by channel 25 will represent the output height error and the signal carried by channel 26 will represent the output width error.
  • the signals carried by channels 25 and 26 will be processed by a circuit which has already been described in relation to FIG. 1 which circuit will emit an error signal representing the right hand side of equation (xxi).
  • This signal represents the desired change in screw setting for stand 1 and may be termed the screw setting error signal.
  • This signal is fed to an amplifier 27 and from thence to servo-valve 28.
  • the servo-valve 28 is fed by a pump 36 and is connected to a drain 31.
  • the servo-valve 28 operates a jack 32 which is used to adjust the screwdown of the rolls of the stand 21.
  • the jack position is representative of the screw setting and with the arrangement shown in FIG. 2 the jack velocity would approximately be proportional to the screw setting error signal. The jack would stop in a new position only when the error signal was zero.
  • the disadvantage with this method is that the jack position is controlled solely by computations made from the rod meter readings and rapid changes in load would cause errors in jack position, which would not be detected until the stock reached the rod meter.
  • FIG. 3 may be best understood if the operation of the constant gap control system shown within the dotted lines 37, is described first.
  • This system is shown applied to stand 1 and with no external inputs into the system at terminal 49, the system will operate to maintain a constant roll gap under load, i.e., the system makes adjustments in the mill setting to compensate for the elastic deflection of the various components of the mill stand 21.
  • the embodiment shown in this diagram uses a hydraulic jack 32 and a servovalve 23 to actuate movement of the rolling mill chucks, screws and wedges actuated either by electric motors or hydraulically may also be used for this purpose.
  • a positive reference signal R at 38 is used to select the required constant roll gap.
  • the signal from the position transducer 51 indicates the extension x or the change in X which is the closed length of the jack.
  • the sense of this signal is negative, i.e., as the jack extends the position transducer 51 gives a negative signal whose magnitude is proportional to the extension of the jack.
  • Any proportion q of this signal can be fed into the resistor 42 by suitable adjustment of the potentiometer 40.
  • the pressure transducer 50 indicates the jack pressure (which is proportional to rolling load) and provides a positive signal proportional to the magnitude of the rolling load P. Any proportion r of this signal can be fed into the resistor 43 by adjustment of the potentiometer 45.
  • the operational amplifier 46 sums the signals fed into 38, 43 and 42, i.e., its output is given by This error signal is fed into the servo-valve and if the signal has a positive sense the servo-valve allows flow into the jack so that it extends it and vice-versa.
  • the jack attains a steady position only when the above error is zero, i.e.,
  • the error signal representing the desired change in screw setting for the stand 21 is shown as being fed to a resistance 33.
  • the screw setting error signal is then fed through a three term controller 34, (a three term controller being a well known piece of equipment), whose output signal may contain three terms, integral, proportional and derivative with respect to the input error.
  • This signal is then presented to the control system shown generally at 37 for the stand 21. In particular, this signal is added to the reference signal of the gap control system 37 which operates with both its .position and pressure feed back loops closed.
  • the signal from the three term controller and the signals from the position and pressure feed back loops are combined by the operational amplifier 46 having resistance 47 in parallel therewith and the resultant signal is passed to amplifier 48; the resultant amplified signal is fed to servo-valve 28.
  • the servo-valve 28 operates the jack 32.
  • the achieved roll gap will be equal to the set roll gap (proportional to the reference signal) plus an amount proportional to the value of the signal from the three term controller 34.
  • the roll gap will attain a new constant value only when the screw setting error is zero (as in the system of FIG. 2). However, if any rapid change in load occurs causing errors in jack position, the pressure and position transducers will detect these changes and rapid corrective action will be taken by the inner control loops of the gap control system. Because of the transport lags, the rate of correction initiated by the error signal which is computed from rod meter readings (outer control loop) will have to be relatively slow.
  • Another alternative is the use of the system as described in relation to FIG. 3 but with the pressure loop of the gap control system 37 open.
  • the change in jack position will be proportional to the signal from the three term controller and this will reach a new steady state position only when the screw setting error is zero.
  • the jack position will still be maintained when sudden changes in load occur because of the action of the inner position loop.
  • the existing values of the coefficients should be used in the equations in this alternative system.
  • new co-efficients will have to be determined. It would be possible to do this experimentally with the gap control system in operation or by deriving the relationship between the two analytically.
  • control may be obtained by the use of equations (xxi) and (xxii).
  • control may be obtained by the use of equations (xxv) and (xxvi).
  • the speed and screw settings of stand 22 would be varied to attain the control over the output height and width of the rod.
  • the screw setting change of stand 22 may be made in the same way as for the method using two screws, namely by using a constant roll gap control system on stand 22.
  • a suitable circuit will adjust the speed setting of stand 22 in response to measured errors in output height and width of the rod.
  • the errors caused by long term variations (such as roll wear) in arrangements using a constant gap control system or a stiff mill design on the second stand may be overcome by feedback of the output height error to stand 2 screwdown and the output width error to the screwdown or roll speed of stand 1 or the roll speed of stand 2.
  • That dimension When one stock dimension only is measured, that dimension must be the output width namely the width of the stock after leaving the second stand, i.e., the second stand in the direction of travel of the stock through the two stands. This is because h is assumed to be zero. If any other stock dimension were measured, it can be shown from the control equations that an additional measurement (which would not be zero) would be required to compute the necessary mill correction.
  • one dimension only namely output stock width
  • the rolling planes of the two stands relative to stock be mutually perpendicular.
  • the rolling sequence may be horizontal-vertical, or vertical-horizontal, relative to the direction of travel of the stock.
  • control equations on the basis of stock measurement elsewhere than after the second stand.
  • control may be effected on the basis of stock measurements taken before the first stand, or between the two stands, or both before the first stand and between the two stands.
  • both stock height and width must be measured; also in these cases it is expected that the stock measurements will have to be used to effect adjustment in at least one of: first stand screwdown, first stand roll speed, second stand screwdown, second stand roll speed.
  • a predictive system In application of the invention to a reversing mill, a predictive system must be used. Thus height and width of the stock prior to entry into the first pass must be measured. These mea sured ingoing height and width errors may be used to predict the changes in the screwdown setting of the first and second passes to eliminate output height and width errors. Adjustment of the roll speed of both the passes would have little or no effect.
  • the prediction for the second pass may be stored. Alternatively, the roll gap of the second pass may be kept constant. After this control action, any height and width errors measured on the output side of the second pass may be used to update value of the constants used in determining the screwdown adjustment of the first pass.
  • the rollway dimension is the stock dimension measured in the direction of the roll gap and guideway dimension is the stock dimension measured perpendicular to the rollway dimension. Prior to the first stand, or pass, the rollway dimension will be measured in the direction of the roll gap of that stand or pass and after the second stand, or pass, the
  • rollway dimension will be measured in the direction of the roll gap of the second stand, or pass. In between the two stands, or passes, the rollway dimension may be measured relative to either the first stand, or pass, or the second stand, or pass.
  • Measurements of stock height and width may be made either directly, for example by means of a rod, or bar meter, or indirectly.
  • the stock height measurement which instead of being measured directly by a meter can be taken to be equal to the roll gap under load which in turn may be determined by adding the known no load roll gap to the mill spring which in turn is a known proportion of the measured rolling load.
  • the stock width can be obtained indirectly by dividing the height into a measured value of mass flow of the stock from the second stand, or pass, or roll gap.
  • the invention of the present application requires some method for measuring stock height and/or width, or stock rollway and/or guideway dimensions.
  • a TV. bar meter has been developed and is the subject of our copending application No. 700/68. It is such a meter which may comprise the rod, or bar, meter referred to with reference to FIGS. 2 and 3.
  • reference 24 is a width meter only feeding width error to three term controller 34.
  • Box 60 is a screwdown controller for adjusting the screwdown on stand 1 (21) in response to the output of the controller 34.
  • the screwdown controller 60 may comprise the screwdown adjustment mechanism of FIG. 2 or may incorporate a constant gap control system and therefore comprise the screwdown adjustment mechanism of FIG. 3.
  • the jack 32 adjusts the roll screwdown of stand 1 (21) in response to the output from controller 60.
  • the reference 61 indicates a constant gap control system for stand 2 (22) feeding jack 32; alternatively, this stand may be of stiff design.
  • the width meter 24 feeds its signal to three term controller 34, the output of which feeds roll speed controller 62.
  • the controller 62 may be comprised by any one of a number of well known means for controlling motor speed, e.g., a Ward-Lennar control system.
  • the output of controller 62 is fed to the rolls of stand 2 (22).
  • Reference 61 indicates a constant gap control system for stand 2 (22); alternatively, this stand may be of stiff design.
  • the width meter 24 feeds its signal to three term controller 34, the output of which feeds roll speed controller 62 for stand 1 (21).
  • Reference 61 indicates a constant gap control system for stand 2 (22) feeding jack 32; alternatively, this stand may be of stiff design.
  • FIGS. 7A-7E A predictive system with input stock width and height error (i.e., width and height error measured immediately upstream of stand 1) fed forward (FIG. 7A) to stand I and stand 2 screwdowns (no control action to alter the steady state stand 1 and stand 2 roll speed settings), or (FIG. 7B) to stand 1 roll speed and stand 2 screwdown (no control action to alter the steady state stand 1 screwdown and stand 2 roll speed settings), or (FIG. 7C) to stand 2 roll speed and screwdown (no control action to alter the steady state stand ll speed and screwdown settings), or (FIG. 7D) to stand 1 screwdown and stand 1 roll speed (no control action to alter the steady state stand 1 roll speed and stand 1 screwdown settings), or (FIG. 7E) to stand 1 screwdown and stand 2 roll speed (no control action to alter the steady state stand 1 roll speed and stand 2 screwdown).
  • the co-efficients used may be updated by measurement of output stock errors.
  • FIGS. 7A to 7E These schemes are illustrated in FIGS. 7A to 7E and it is believed that no detailed description of these Figures is necessary bearing in mind that the items referenced 23, 32, 34, 60, 62 have already been described.
  • reference 24 denotes a rod, or bar, meter measuring both stock height and width.
  • Line 63 carries the rollway dimension (height) error and line 64 the guideway dimension (width) error.
  • the boxes 65 and 66 of FIGS. 7A to 7E enclose circuits having the same electrical components l2, l3, l6 and 18, and arranged in the same manner, as appear in FIGS. 2 and 3.
  • the values chosen for these components in boxes 65 and 66 are not necessarily the same as the values of these components in FIGS. 2 and 3 and are determined by the appropriate control equations.
  • FIGS. 8A-8C Stock output width error feedback for adjustment of stand 1 screwdown or stand 1 roll speed or stand 2 roll speed together with stock output height error feedback for adjustment of stand 2 screwdown for correction of the long term variations in the roll gap at stand 2, which embodies a constant roll gap system or is of stiff design. No control action would be taken to alter that mill parameter (steady state stand 1 screwdown and roll speed settings and steady state stand 2 roll speed settings) not adjusted in response to the said stock measurement.
  • the mill parameters (screwdown of each pass in the case of rolling with a reversing mill, and screwdown and roll speed of each stand in the case of rolling with a multi-stand mill) will be initially set to steady state values. Then to control the rolling operation to eliminate output height and width errors which would arise as a result of variations in input stock height and width, at least one of the mill parameters is adjusted in response to stock or mill measurement.
  • stock measurement is to be construed .as covering measurement of one or more stock dimensions either directly or indirectly as previously indicated.
  • the term mill measurement is to be construed as covering measurement of one or more mill parameters (roll speed or roll load) either directly or indirectly as previously indicated.
  • the control system of 1) may operate by direct measurement of outgoing width errors only in order to actuate either a screw change on the first stand or a speed change on either of the two stands.
  • the second stand should be of a stiff design and/or could incorporate a constant roll gap control system to provide the stand with infinite stiffness.
  • the first stand may also be operated to advantage by incorporating a constant roll gap control system.
  • the control system of 1) may operate by direct measurement of both output height and width errors, such that height errors actuate the screw setting of the second stand (to achieve constant roll gap at that stand) and width errors the screw setting on the first stand or the speed setting of either stand.
  • a stiff second stand design would be advantageous or alternatively the second stand could incorporate a constant roll gap control system.
  • a constant roll gap control system may also be usefully incorporated in stand 1.
  • the control system of 1) may operate by measurement of both output height and width errors, which when utilized in accordance with equations as devised herein, may be used to actuate stand one or stand two speed or stand one gap setting. Stand two should be of a stiff design or have a constant roll gap control system.
  • the control system of (1 ) may operate by measurement of both output height and output width errors which when utilized in accordance with the equations as derived herein may be used to actuate stand 1 or stand 2 speed or stand 1 gap setting.
  • Stand 2 is controlled by height error feedback and is of stiff design or has a constant gap control system.
  • control system of I may operate by direct measurement both of output height and width errors which when utilized in accordance with equations as derived herein may be used to actuate two or more of the following four control variables, namely: the two screw and speed settings of the stands. It may also beadvantageous to have a constant gap control system incorporated in each stand.
  • the control system of 1) may operate by direct measurement of both the input height and width errors which when utilized in accordance with equations derived in the same manner as the equations herein may be used to actuate two or more of the following four control variables, namely the two screw and speed settings of the stands. It may also be advantageous to have a constant gap control system incorporated in each stand.
  • this control system may use the measurements of output height and width errors for the specific purpose of updating the co-efficients in the equations that enable screw or speed setting changes to be predicted.
  • control system of 1) may use indirect measurement of dimension errors by monitoring changes in mill parameters which can be related by equations derived in the same manner as the equations herein.
  • a method of rolling stock other than stock having, in a cross section transverse the length of the stock, one dimension which is small compared with, and of an order of magnitude lower than, another dimension normal to said one dimension, said method including rolling the stock in at least two successive rolling stands with variable interstand tension, and controlling the rolling to produce on the discharge side of the last of the two rolling stands desired stock having both its height and width controlled, the control of the rolling being provided by simultaneously adjusting during rolling the roll gap of one of the stands and at least one other of the following independently adjustable parameters (i) roll speed of the penultimate rolling stand, (ii) roll gap setting of the penultimate rolling stand, (iii) roll speed of the last rolling stand, and (iv) roll gap setting of the last rolling stand, provided that when the last rolling stand has a constant roll gap control system at least one of parameters (i) and (iii) is adjusted, both adjustments being made in response to errors in two mutually perpendicular dimensions of the cross section of the stock measured at one location.
  • a rolling mill for rolling stock other than stock having, in a cross section transverse the length of the stock, one dimension which is small compared with, and of an order of magnitude lower than, another dimension normal to said one dimension, said mill including at least two successive rolling stands through which the stock is rolled with variable interstand tension; and control means for controlling the rolling to produce on the discharge side of the last of the two rolling stands desired stock having both its height and width controlled, the control means being adapted to provide the control by simultaneously adjusting during rolling the roll gap setting of one of said stands and at least one other of the following independently adjustable parameters (i) roll speed of the penultimate rolling stand (ii) roll gap setting of the penultimate rolling stand, (iii) roll speed of the last rolling stand, and (iv) roll gap setting of the last rolling stand, provided that when the last rolling stand has a constant roll gap control system at least one of parameters (i) and (iii) is adjusted, both adjustments being made in response to errors in two mutually perpendicular dimensions of the cross section of the stock measured at one
  • control means are adapted such that both adjustments to the said parameters will be made in response to errors in cross section of the desired stock as rolled by the last stand.
  • a rolling mill including a speed control for adjusting the roll speed of the last rolling stand in response to error in the width of the desired stock as rolled by the last rolling stand, and a constant gap controller for keeping the roll gap of the last rolling stand substantially constant.
  • a rolling mill including a speed controller for adjusting the roll speed of the penultimate rolling stand in response to error in the width of the desired stock as rolled by the last stand, controller for keeping the roll gap of the last rolling stand substantially constant.
  • a rolling mill according to claim 7 including a controller for adjusting the roll gap setting of the penultimate and last rolling stands.
  • a rolling mill according to claim 7 including a controller for adjusting the roll gap setting of the last rolling stand in response to error in height of the desired stock and a controller for adjusting another of said parameters in response to error in the width of the desired stock.

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  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US832571A 1968-06-14 1969-06-12 Control for rolling means having successine rolling stands Expired - Lifetime US3650135A (en)

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JP (1) JPS5110193B1 (de)
BE (1) BE734579A (de)
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FR (1) FR2010900A1 (de)
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Cited By (11)

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US3763678A (en) * 1972-06-30 1973-10-09 Gen Electric Apparatus for automatic control of product fill dimension
US3901059A (en) * 1973-10-08 1975-08-26 Nippon Steel Corp Shape-rolling mill for working metallic section material
US4003230A (en) * 1974-08-16 1977-01-18 Hitachi, Ltd. Tension control system for universal mill
US4123927A (en) * 1976-07-14 1978-11-07 Friedrich Kocks Gmbh & Co. Rolling mill
US4141071A (en) * 1977-03-17 1979-02-20 Bethlehem Steel Corporation Automatic diametric dimension control for mill for rolling round bars
EP0075960A2 (de) * 1981-09-30 1983-04-06 Mitsubishi Denki Kabushiki Kaisha Regeleinrichtung für ein kontinuierliches Walzwerk
EP0075961A2 (de) * 1981-09-30 1983-04-06 Mitsubishi Denki Kabushiki Kaisha Regeleinrichtung für ein kontinuierliches Walzwerk
US4535614A (en) * 1983-06-08 1985-08-20 Nippon Steel Corporation Method of gauging and controlling workpiece profile in a rolling mill
US4878368A (en) * 1987-12-04 1989-11-07 General Electric Company Adaptive roll formed system and method
EP0435547A2 (de) * 1989-12-22 1991-07-03 British Steel plc Kontrollsystem für Walzwerke
US20100269556A1 (en) * 2007-06-11 2010-10-28 Arcelormittal France Method of rolling a metal strip with adjustment of the lateral position of a strip and suitable rolling mill

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JPS60255209A (ja) * 1984-05-30 1985-12-16 Mitsubishi Heavy Ind Ltd 圧延機におけるエツジヤ開度制御方法
CN113617855B (zh) * 2021-07-16 2023-02-17 太原科技大学 一种轧机控制方法以及系统
KR102577310B1 (ko) * 2023-06-27 2023-09-13 에이치디컴퍼니 주식회사 폐 플라스틱 창호 분쇄설비 및 이를 사용한 폐 플라스틱창호 분쇄공정

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US3049036A (en) * 1957-04-08 1962-08-14 Westinghouse Electric Corp Automatic strip thickness control apparatus
US3212310A (en) * 1962-05-31 1965-10-19 Armco Steel Corp Automatic gauge and tension control system
US3222900A (en) * 1961-05-03 1965-12-14 Asea Ab Speed control for rocking mill stands
US3251207A (en) * 1963-03-08 1966-05-17 Morgan Construction Co Automatic screwdown control
US3468145A (en) * 1965-06-16 1969-09-23 British Iron Steel Research Billet mill wherein the rolling gap is controlled during the penultimate pass and fixed during the final pass
US3526113A (en) * 1968-04-12 1970-09-01 Morgan Construction Co Automatic shape control system for bar mill
US3531961A (en) * 1968-03-13 1970-10-06 Westinghouse Electric Corp Method and system for controlling strip thickness in a tandem reduction mill

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US3222900A (en) * 1961-05-03 1965-12-14 Asea Ab Speed control for rocking mill stands
US3212310A (en) * 1962-05-31 1965-10-19 Armco Steel Corp Automatic gauge and tension control system
US3251207A (en) * 1963-03-08 1966-05-17 Morgan Construction Co Automatic screwdown control
US3468145A (en) * 1965-06-16 1969-09-23 British Iron Steel Research Billet mill wherein the rolling gap is controlled during the penultimate pass and fixed during the final pass
US3531961A (en) * 1968-03-13 1970-10-06 Westinghouse Electric Corp Method and system for controlling strip thickness in a tandem reduction mill
US3526113A (en) * 1968-04-12 1970-09-01 Morgan Construction Co Automatic shape control system for bar mill

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US3763678A (en) * 1972-06-30 1973-10-09 Gen Electric Apparatus for automatic control of product fill dimension
US3901059A (en) * 1973-10-08 1975-08-26 Nippon Steel Corp Shape-rolling mill for working metallic section material
US4003230A (en) * 1974-08-16 1977-01-18 Hitachi, Ltd. Tension control system for universal mill
US4123927A (en) * 1976-07-14 1978-11-07 Friedrich Kocks Gmbh & Co. Rolling mill
US4141071A (en) * 1977-03-17 1979-02-20 Bethlehem Steel Corporation Automatic diametric dimension control for mill for rolling round bars
US4520642A (en) * 1981-09-30 1985-06-04 Mitsubishi Denki Kabushiki Kaisha Control device for continuous rolling machine
EP0075961A2 (de) * 1981-09-30 1983-04-06 Mitsubishi Denki Kabushiki Kaisha Regeleinrichtung für ein kontinuierliches Walzwerk
EP0075961A3 (en) * 1981-09-30 1984-03-21 Mitsubishi Denki Kabushiki Kaisha Control device for a continuous rolling machine
EP0075960A2 (de) * 1981-09-30 1983-04-06 Mitsubishi Denki Kabushiki Kaisha Regeleinrichtung für ein kontinuierliches Walzwerk
EP0075960B1 (de) * 1981-09-30 1989-02-08 Mitsubishi Denki Kabushiki Kaisha Regeleinrichtung für ein kontinuierliches Walzwerk
US4535614A (en) * 1983-06-08 1985-08-20 Nippon Steel Corporation Method of gauging and controlling workpiece profile in a rolling mill
US4878368A (en) * 1987-12-04 1989-11-07 General Electric Company Adaptive roll formed system and method
EP0435547A2 (de) * 1989-12-22 1991-07-03 British Steel plc Kontrollsystem für Walzwerke
EP0435547A3 (en) * 1989-12-22 1991-12-04 British Steel Plc Improvements in and relating to control systems for rolling mills
US20100269556A1 (en) * 2007-06-11 2010-10-28 Arcelormittal France Method of rolling a metal strip with adjustment of the lateral position of a strip and suitable rolling mill
US8919162B2 (en) * 2007-06-11 2014-12-30 Arcelormittal France Method of rolling a metal strip with adjustment of the lateral position of a strip and suitable rolling mill

Also Published As

Publication number Publication date
DE1930169A1 (de) 1969-12-18
BE734579A (de) 1969-11-17
SE359463B (de) 1973-09-03
GB1270246A (en) 1972-04-12
FR2010900A1 (de) 1970-02-20
JPS5110193B1 (de) 1976-04-02

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