US3817068A - Roll gap and gap error monitoring device - Google Patents

Roll gap and gap error monitoring device Download PDF

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Publication number
US3817068A
US3817068A US00358837A US35883773A US3817068A US 3817068 A US3817068 A US 3817068A US 00358837 A US00358837 A US 00358837A US 35883773 A US35883773 A US 35883773A US 3817068 A US3817068 A US 3817068A
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gap
roll
rolls
distance
constant
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F Meyer
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures

Definitions

  • the present invention relates to a device for detect ing information and representation on the gap between the working rolls of a rolling mill, so that the result may serve as input for a controller for maintaining the gap constant by means of automatic feedback control.
  • Rolling mills generally require control of the roll gap because the thickness of the rolled sheet stock or the like is usually to be kept within very close tolerances.
  • the feedback control must meet significant dynamic requirements which include a fast operating actuator for adjusting the gap and which further include a pick up device detecting the thickness of the rolled stock as controlled variable in one way or another. This pick up device should operate without or with only insignificant delay so that the stock width will not vary beyond permissible limits.
  • measuring strip or sheet stock thickness right at the roll gap is not accurate enough due to the deformation of the rolls during working and further due to some resilient reaction of the stock after emerging from the gap. Therefore, the strip or rolled sheet stock thickness is usually measured indirectly by detecting the roll gap in one way or another.
  • the different controllers for the roll gap differ primarily in the set up and design of the gap detection.
  • a rather simple but relatively inaccurate method uses the displacement of the roll positioning plunger as representation of the gap.
  • the inaccuracy here stems from the fact that the gap is only indirectly ascertained and roll flattening mill stand expansion and eccentricities in the support rolls render the relationship between the true gap and measured input rather unreliable.
  • the measured value supposedly representing the roll gap must be subjected to numerous corrections as to all these disturbing influences.
  • Another method uses a spindle between the inserts of the support rolls, and the changes in spindle force are used as an (indirect) representation of the roll gap.
  • the controller operates here to maintain the spindle force at a constant level, and, hopefully the roll gap is maintained constant therewith.
  • This method works actually as a first order approximation, but this system uses as command input a supplemental spindle device which does not consider roll flattening, and eccentricities of the support are entered into this pick up system with the wrong sign. Thus, it is quite impossible here to provide for an optimized controller on that basis.
  • the principle of the invention resides in the avoiding of directly measuring rolling gap width.
  • the gap width is measured subject to two fixed corrections.
  • One correction is the position adjustment of one of the transducing surfaces in strict correspondence with the desired gap width.
  • a level change of the former establishes therewith a change in the latter. That level is in effect subtracted from the measured distance, because one can say that the measured distance (except for the second correction) is equal to the gap minus adjusted level to the extent it differs from the particular level for a desired gap zero.
  • the other correction is a fixed offset from zero which is added in fonn of a fixed distance.
  • fixed distance is the one dynamically maintained by the gap controller; on the other hand, fixed distance and the corresponding signal representation in the pick up is a fixed instrument parameter.
  • the true measured value is thus the value resulting from that fixed (but arbitrarily selectable) distance plus the: positive or negative gap fluctuation by which the actual gap width deviates from the desired one.
  • the distance between the two surfaces is measured in any manner known per se such as inductively, capacitively, optically or electromechanically.
  • the particular distance between the surfaces to be maintained constant by the gap controller is selected to obtain maximum sensitivity of the respective pick up system.
  • the adjustable surface may be established by a micrometer pm.
  • FIGS. la and lb are front views of a pair of rolls in a rolling mill with schematic representation of the production of a controller input in accordance with the preferred embodiment of the invention
  • FIGS. 2 and 3 are side views of rolls with two different pick up arrangements.
  • FIG. 4 is another side view of rolls in a mill stand with another pick up device.
  • FIGS. la and lb show a pair of working. rolls, 10 and 11 suitably joumalled in a stand by means of shaft ends.
  • One or both of the rolls is adjustable in relation to the respective other one so as to define and adjust the disposition of the rolls for establishing a rolling gap Sw.
  • the adjustable one of the rolls is posi' tion controlled by means of automatic feedback control, and the detection of representation of the actual gap width in every instant is necessary for that control.
  • the adjustment of the respective roll for that purpose is conventional and shown very schematic only. Of immediate relevancy here is the acquisition of a representation of the gap and the formation of a control signal representing the deviation of the desired gap width from the actual one.
  • Each roll has an annular shoulder 17 on each of its axial faces for joumalling a stationary annulus.
  • the annuli for roll 11 are denoted by reference numeral 12, the annuli for roll are identified by numeral 13.
  • These annuli differ in that each annulus 12 defines a radially facing surface 14 of fixed distance from the axis of roll 11, while annuli 13 each have an adjustable transducing surface portion 15.
  • a radially adjustable pin 16 projects from the annulus 13 to which it pertains, and the front end (facing radially with respect to the axis of the roll) establishes a particular distance level from the axis of roll 10; that level is an adjustable one.
  • the distance between the transducing surface 14 of an annulus of an annulus 12 and the adjustable level 15 on the respective adjacent annulus 13 is identified by 8,.
  • S denotes the level height of reference surface 15 as it extends above or beyond the annulus 13 so that S, O is a zero level.
  • Sw represents the rolling gap.
  • One or the other annulus, 12 or 13 of a facing pair contains an instrument pack for measuring the distance between first surface 14 and second surface 15. That instrument pack serves as a pick up which provides a signal representing S, and that signal is the input to the rolling gap controller.
  • the controller operates basically to maintain S, at a constant level. This is true regardless of the width of the actual gap between rolls l0 and 11.
  • the various components are proportioned so that for constant 8,, Sw S, (plus, possibly, a fixed offset which has no bearing on the principle aspects considered here).
  • the level of adjusting the extent of projection of pin 16 from annulus 13 determines the desired gap width. Since S, is and remains constant, fluctuations in actual gap width Sw are reflected as deviations of S, from the constant value.
  • the controller operates to maintain S, constant, the gap SW is regulated thereby to assume and maintain a width equal to 8,.
  • FIG. 2 showing the transducing and gap detecting system in greater detail.
  • Annulus 13 is shown with a carrier 18 from which projects pin 16.
  • the carrier arms may serve as mount for the annuli to prevent them from following the rotation of the respective rolls on which they are journalled.
  • Carrier 18 will be particularly provided with means, such as a micrometer or the like to adjust the level of the operating and transducing surface 15 which defines a datum or reference plane.
  • the annulus 12 is provided with an analogously constructed carrier for supporting a pick up with an operating and detection surface 14.
  • the pick up gap 8, is defined by the distance between surfaces 14 and 15 and one or the other carrier may include inductive, capacitive, optical or electromechanical means to respond to that gap.
  • FIG. 3 the particular example shown here obviates the need for one annulus, and the one surface (14) is defined here as the periphery of the shoulder 17.
  • the annulus 13 is provided as before.
  • a demagnetizing device 19' should be provided in order to suppress disturbances resulting from external magnetic stray fields.
  • FIG. 4 shows the definition of the datum planes for gap pick up by means of journals for the rolls.
  • the supports 21 and 22 for the rolls are mounted in the stand 25.
  • the support 21 for the lower roll 10 is provided with a transducer 23 from which projects the adjustable pin 16.
  • the other, oppositely positioned support 22 for the upper roll 11 carries a means for defining the surface 14.
  • Reference numeral 30 identifies the adjustment for the lower roll for adjusting the rolling gap.
  • the inventive transducing and pick up system does not directly measure the actual gap. What is measured is a basically arbitrarily selectable distance S, and the controller operates to keep that distance constant.
  • the distance S can be interpreted as an error-distance plus a constant position bias.
  • the distance S is basically selected to have the transducer pick up operating in a range of maximum sensitivity.
  • the transducer signal representing S is a controller input combining a gap error signal plus constant bias.
  • the signal representing the distance S is exactly equal to that constant bias when the actual roll gap' equals the desired gap.
  • the desired gap as such is not represented in S, but it can be seen, that any desired gap can be maintained through control towards a constant S, upon adjusting the level of reference surface 15 (height of pin 16 as projecting from annulus 13) to a particular level. This way the thickness of the rolled stock can be maintained constant, regardless of what that thickness value is.
  • the controller has the same dynamic range as far as its input and input signal processing isconcemed.
  • the actual gap width is given by S, S, a constant bias representing S, at zero gap error.
  • S is the projection of the pin and aside from its adjustment, it may be represented as a measured value.
  • S is ascertained on a running basis by the transducer arrangement, and the constant bias can be predetermined as the value 8,, actually provided by the measurement upon S Sw. This is part of the initial calibration procedure. Only S, will vary during operation, and that variation represents the fluctuation of the true gap width.
  • the desired value (8,) may be separately indicated, e.g., digitally.
  • the inventive device has a number of advantages.
  • the desired gap width is mechanically adjustable and accuracy here is determined only by the adjustment as such and is not influenced by the rolling process.
  • the rolls can be maintained in parallel by means of the control for each shaft end and journal.
  • Journalled annuli or truly stationary support devices for the pick up can be used, the latter being of advantage for high rolling speeds.
  • the accuracy of the measurement is not influenced by cooling.
  • calibration is rather simple. 8, 0 is established for engaging rolls, and S, follows the gap as they are separated. Conversely, upon increasing S under the closed loop conditions, the device will operate as follower controller seeking or maintaining dynamically the adjusted gap. Consequently, an exchange of rolls is not difficult and will pose no problems as to control with a new set of rolls.
  • Apparatus for providing a control signal for a controller controlling the width of the gap between a pair of rolls in a rolling mill for maintaining that gap constant at a predetermined level comprising first means defining a first radially facing surface on one of the rolls, but axially displaced from the working surface of the one roll;
  • second means defining a second, radially facing surface on the other one of the rolls, facing the first surface
  • third means included in the second means for mechanically adjusting the radial distance of the second surface from the axis of the other roll within a range of levels, whereby one of the levels represents zero gap width; the controller operating to maintain the distance between. the first and second surfaces constant independently from the level of adjustment of the second surface by operation of the third means.
  • the second means including a carrier joumalled on one shaft end of the other roll and carrying an adjustment pin having an axial face, facing radially with respect to the axis of the other roll and serving as the second surface.
  • Apparatus as in claim 1 the one roll provided with a cylindrical transducer surface serving as the first surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Measuring Arrangements Characterized By The Use Of Fluids (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
US00358837A 1972-05-20 1973-05-10 Roll gap and gap error monitoring device Expired - Lifetime US3817068A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2224909A DE2224909A1 (de) 1972-05-20 1972-05-20 Anordnung zur messung des spaltes eines walzenpaares fuer ein walzgeruest

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US3817068A true US3817068A (en) 1974-06-18

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US00358837A Expired - Lifetime US3817068A (en) 1972-05-20 1973-05-10 Roll gap and gap error monitoring device

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US (1) US3817068A (enrdf_load_stackoverflow)
JP (1) JPS529391B2 (enrdf_load_stackoverflow)
DE (1) DE2224909A1 (enrdf_load_stackoverflow)
FR (1) FR2185451B1 (enrdf_load_stackoverflow)
GB (1) GB1431984A (enrdf_load_stackoverflow)
IT (1) IT987443B (enrdf_load_stackoverflow)
SE (1) SE413854B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943634A (en) * 1973-12-18 1976-03-16 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Device for measuring and controlling the gap between rollers in a roller stand
US4136454A (en) * 1976-05-17 1979-01-30 De La Rue Instruments Limited Apparatus for gauging the thickness of moving laminar material
US4502311A (en) * 1982-12-08 1985-03-05 White Consolidated Industries, Inc. Apparatus and method for press-edging hot slabs
US5295803A (en) * 1992-02-21 1994-03-22 Bridgestone Corporation Device for controlling thickness of sheet in calendering
US5533371A (en) * 1991-02-01 1996-07-09 Lauener Engineering, Ltd. Measurement device for roll gap control and process for its operation
US5743299A (en) * 1994-01-18 1998-04-28 Insituform (Netherland) B.V. Dual containment pipe rehabilitation system and method of installation
CN102989792A (zh) * 2011-09-16 2013-03-27 上海梅山钢铁股份有限公司 一种热轧立辊辊缝的标定方法
US20170080466A1 (en) * 2015-09-23 2017-03-23 Craig K. Godwin High Precision Thickness Control on a Rolling Mill for Flat Rolled Metal
CN116078832A (zh) * 2022-12-28 2023-05-09 中重科技(天津)股份有限公司 一种轧辊位置调整指示装置及方法

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2404763C2 (de) * 1974-02-01 1982-05-13 Vereinigte Flugtechnische Werke Gmbh, 2800 Bremen Meßvorrichtung zur Erfassung des Spaltes eines Arbeitswalzenpaares
DE2439580C3 (de) * 1974-08-17 1982-09-23 Achenbach Buschhütten GmbH, 5910 Kreuztal Meßeinrichtung zur Ermittlung des Abstandes der Stützwalzeneinbaustücke eines Quarto-Walzgerüstes
DE2503130C3 (de) * 1975-01-27 1986-02-13 Fried. Krupp Gmbh, 4300 Essen Walzenabstandsmeßvorrichtung
DE2530966C3 (de) * 1975-07-11 1982-02-11 Vereinigte Flugtechnische Werke Gmbh, 2800 Bremen Meßvorrichtung für eine Walzspaltregelungseinrichtung
DE2952232C2 (de) * 1979-12-22 1985-07-11 Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn Meßvorrichtung zur Erfassung des Spaltes eines Arbeitswalzenpaares
FI840380L (fi) * 1984-01-30 1985-07-31 Ld Testers Oy Anordning foer maetning av papprets tjocklet och kompressibilitet.
EP0259508B1 (de) * 1986-09-09 1991-07-24 Wilhelm Hegenscheidt Gesellschaft mbH Verfahren und Einrichtung zum Walzen von Werkstücken aus duktilem Werkstoff
JPH0227503U (enrdf_load_stackoverflow) * 1988-08-10 1990-02-22
US8943912B1 (en) * 2010-05-03 2015-02-03 Ken E. Singleton Proximity probe mounting device
CN108472905B (zh) * 2016-01-14 2020-04-14 株式会社Ihi 轧制装置和轧制装置的改造方法
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684001A (en) * 1952-02-23 1954-07-20 Olin Ind Inc Automatic screw-down control
GB827167A (en) * 1951-11-27 1960-02-03 British Iron Steel Research Improvements in and relating to the measurement of thickness in production of sheet and strip material
US3358485A (en) * 1965-02-15 1967-12-19 United States Steel Corp Measuring and controlling gap between rolls
US3389588A (en) * 1965-03-09 1968-06-25 United States Steel Corp Apparatus for controlling the position of work rolls
CH489287A (de) * 1969-07-14 1970-04-30 Alich Guenther Anordnung zur Messung und Regelung der Achsenverlagerung von Walzen
US3570288A (en) * 1967-10-21 1971-03-16 Krupp Gmbh Rolling-mill assembly with improved control system
US3662576A (en) * 1969-06-21 1972-05-16 Ver Flugtechnische Werke Control for roll gap of a rolling mill

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2146442A (en) * 1936-06-25 1939-02-07 Hammer Mill Paper Company Measuring apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB827167A (en) * 1951-11-27 1960-02-03 British Iron Steel Research Improvements in and relating to the measurement of thickness in production of sheet and strip material
US2684001A (en) * 1952-02-23 1954-07-20 Olin Ind Inc Automatic screw-down control
US3358485A (en) * 1965-02-15 1967-12-19 United States Steel Corp Measuring and controlling gap between rolls
US3389588A (en) * 1965-03-09 1968-06-25 United States Steel Corp Apparatus for controlling the position of work rolls
US3570288A (en) * 1967-10-21 1971-03-16 Krupp Gmbh Rolling-mill assembly with improved control system
US3662576A (en) * 1969-06-21 1972-05-16 Ver Flugtechnische Werke Control for roll gap of a rolling mill
CH489287A (de) * 1969-07-14 1970-04-30 Alich Guenther Anordnung zur Messung und Regelung der Achsenverlagerung von Walzen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943634A (en) * 1973-12-18 1976-03-16 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Device for measuring and controlling the gap between rollers in a roller stand
US4136454A (en) * 1976-05-17 1979-01-30 De La Rue Instruments Limited Apparatus for gauging the thickness of moving laminar material
US4502311A (en) * 1982-12-08 1985-03-05 White Consolidated Industries, Inc. Apparatus and method for press-edging hot slabs
US5533371A (en) * 1991-02-01 1996-07-09 Lauener Engineering, Ltd. Measurement device for roll gap control and process for its operation
US5295803A (en) * 1992-02-21 1994-03-22 Bridgestone Corporation Device for controlling thickness of sheet in calendering
US5743299A (en) * 1994-01-18 1998-04-28 Insituform (Netherland) B.V. Dual containment pipe rehabilitation system and method of installation
CN102989792A (zh) * 2011-09-16 2013-03-27 上海梅山钢铁股份有限公司 一种热轧立辊辊缝的标定方法
CN102989792B (zh) * 2011-09-16 2014-07-09 上海梅山钢铁股份有限公司 一种热轧立辊辊缝的标定方法
US20170080466A1 (en) * 2015-09-23 2017-03-23 Craig K. Godwin High Precision Thickness Control on a Rolling Mill for Flat Rolled Metal
CN116078832A (zh) * 2022-12-28 2023-05-09 中重科技(天津)股份有限公司 一种轧辊位置调整指示装置及方法

Also Published As

Publication number Publication date
FR2185451A1 (enrdf_load_stackoverflow) 1974-01-04
GB1431984A (en) 1976-04-14
SE413854B (sv) 1980-06-30
JPS529391B2 (enrdf_load_stackoverflow) 1977-03-15
DE2224909A1 (de) 1973-11-22
IT987443B (it) 1975-02-20
JPS4956657A (enrdf_load_stackoverflow) 1974-06-01
FR2185451B1 (enrdf_load_stackoverflow) 1976-04-09

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