US3570288A - Rolling-mill assembly with improved control system - Google Patents

Rolling-mill assembly with improved control system Download PDF

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Publication number
US3570288A
US3570288A US776303A US3570288DA US3570288A US 3570288 A US3570288 A US 3570288A US 776303 A US776303 A US 776303A US 3570288D A US3570288D A US 3570288DA US 3570288 A US3570288 A US 3570288A
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United States
Prior art keywords
rolls
control system
gap
rolling
improved control
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Expired - Lifetime
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US776303A
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English (en)
Inventor
Friedrich Fischer
Franz Gutlbauer
Robert Kracht
Georg Engel
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Fried Krupp AG
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Fried Krupp AG
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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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • 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

Definitions

  • a rolling mill with two rolls has an improved control assembly which comprises electromagnetic or photoelectric sensors which meter the gap between the rolls while remaining out of contact with them. The output of this sensing arrangement is compared with a reference value to yield an error signal which is fed to an adjustment mechanism to change the roller gap if necessary. Further sensors for metering a bending in the rolls can be provided and coupled with a device for straightening the roll. In addition a gauge measuring the thickness of the rolled workpiece can be used to provide a cross check on the functioning of the apparatus.
  • Our invention relates to an improved control system for a rolling-mill assembly, in particular to a system for maintaining the two work rolls of such an assembly at an exact gap spacing.
  • Rolling-mill assemblies are known wherein pressure gauges are connected to the hydraulic means for adjusting the gap between the rolls. These pressure gauges are connected to the hydraulic feed to maintain a constant and even pressure on the rolls.
  • irregularities in the roundness of the rolls and in the homogeneity of the material being rolled are not compensated for by such an arrangement; indeed, often they are only worsened.
  • arrangements as above described are at best sluggish and insensitive.
  • This means can be electromagnetic or photoelectric i.e. an electromagnetic-wave field.
  • the sensing means produces an output signal which, according to a main feature of the invention, is compared with a reference signal (representing the ideal gap spacing) to produce an error signal which is used to regulate a hydraulic adjustment mechanism which accordingly varies the gap between the rolls to correct deviation.
  • further means for detecting or metering a bending of the rolls can be provided and coupled with an arrangement for straightening out the bent roll.
  • a gauge for metering the thickness of the rolled material after rolling is connected with the above-described system for providing a check on same.
  • FIG. 1 is a perspective view showing a rolling-mill assembly with a control system according to our invention
  • FIG. 2 is a diagrammatic detail of FIG. 1;
  • FIG. 3 is a side view of a further embodiment of a sensing means according to our invention.
  • FIG. 4 is a partly perspective view of an arrangement for correcting a bend in a roll.
  • FIG. 5 is a side view of an arrangement for checking the functioning of the control system of FIG. 1.
  • FIG. 1 shows a rolling-mill assembly as described in the commonly assigned application Ser. No. 731,802 entitled Rolling-Mill Assembly filed by Robert Kracht on May 24, 1968.
  • Two support rollers 1a and 1b mounted in journal blocks 2a and 2b, respectively, support work rollers 3a and 3b mounted in blocked 4a and 4b, respectively.
  • Below the blocks 4a and 4b are powerful hydraulic cylinders 5 and 5' which serve as the adjustment mechanism for a gap G between the rollers 3a and 3b.
  • a sensing device 6 which meters the gap G between these two rolls.
  • This device 6 is connected through a line 7 to a comparator or error detector 8 where its output signal is compared with a reference signal coming from a signal generator 9.
  • An error signal is produced in comparator 8 (see pages 4 ff. of Servomechanism Practice, McGraw-Hill, 1960) and is sent through a line 10 to control a hydraulic control device or valve 11 which actuates the cylinder 5 through a line 12.
  • a similar arrangement can be provided for the cylinder 5.
  • the control device 11 may be any of the electrical input/fluid-pressure output devices shown and described at pages 394 if. of Servomechanism Practice, Ahrendt & Savant, McGraw-Hill, New York, Second edition, 1960.
  • FIG. 2 shows an electromagnetic embodiment of the sensor 6.
  • the gap G between the rolls 3a and 3b is metered by a magnetometer 13 (see US. Pat. No. 3,398,- 360 and those of the same class) which is connected to an AC source 14 and whose output is fed through a pulse shaper 15 to the comparator 8 (FIG. 1).
  • the output is here converted to pulses by the shaper 15 to make it easier to work with.
  • FIG. 3 shows a photoelectric embodiment of a sensing device where light pulses are generated by a bulb 17 connected to a pulse generator 16 and are picked up on the other side of the gap G between the rolls 3a and 3b by a photocell 18 also connected through a pulse shaper 19 to the comparator 8 (FIG. 1).
  • a change in the gap G makes for a change in the magnetic field of the magnetometer 13 while in FIG. 3 a change in the gap G makes for more or less light received by the photocell 18. Both of these changes can be easily converted into changing pulse trains, which are ideally suited for the control system proposed by our invention.
  • FIG. 4 shows a roll 30 which is engaged by a small roller wheel 28 of a hydraulic cylinder 27.
  • a pulse generator 20 triggers a light bulb 21 whose light pencil or beam is reflected by a rotating mirror 22 across the length of the roll 3c.
  • a scanner 23 picks up the sequential light pulses reflected by this roll 3c and, e.g. according to principles generally described in US. Pat. No. 3,061,731 and the references cited therein, thereby generates a signal, preferably a pulse signal, which is combined in a comparator 25 with a reference signal from a generator 24 to produce an error-signal output dependent on the bending of the roll 30. This is fed into an electric-hydraulic converter 26 where it is used to feed the cylinder 27 to push on the roll 30 and compensate for the bending.
  • a thickness gauge such as rollers 29a and 2911 connected to sensors 30a and 30b may be provided to measure the thickness of the workpiece W as shown in FIG. 5.
  • the outputs of the two sensors 30a and 30b are compared in a comparator 31 with a signal from an adjustable reference-signal generator 32 as above to determine if the actual width of the workpiece W is more or less than the Width which it is supposed to have according to the setting of the cylinders 5 and 5' (FIG. 1) in turn determined by the control system.
  • this check-up device can over-ride the signal passing from the comparator 8 and the converter 11 of FIG. 1, and reset the rolls 3a and 3b as is necessary.
  • a control system comprising:
  • sensing means adjacent said gap creating an electromagnetic-wave field between proximal surfaces of said rolls defining said gap at least in the region thereof traversedby a workpiece passing between said rolls for metering said height and generating an output signal representing same;
  • control means responsive to said signal and connected to said adjustment mechanism for actuating same to establish a predetermined gap height between said rolls of said region.
  • sensing means includes an eleetromagnet and said field is a magnetic field.
  • sensing means includes a light source on one side of said gap and said field is a light beam.
  • control means comprises means for generating a reference signal representing said predetermined gap width and comparing means connected thereto and to said sensing means for combining said signals and producing an error sigal representing the difference between said output and reference signals for operating said adjustment mechanism to set said rolls at said predetermined gap width.
  • control system defined in claim 1, further comprising means responsive to bending configuration of the said surface of at least one of said rolls along said gap for generating a second output signal representing said configuration, and means responsive to said second output signal for bending said one of said rolls to straighten same.
  • control system defined in claim 1, further check means for gauging the thickness of a workpiece rolled between said rolls and for generating a third output signal representing said thickness, and second control means connected to said check means and connectable between said sensing means and said adjustment mechanism on a condition of said thickness being substantially different from said predetermined gap width to override same.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
US776303A 1967-10-21 1968-10-18 Rolling-mill assembly with improved control system Expired - Lifetime US3570288A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671602033 DE1602033A1 (de) 1967-10-21 1967-10-21 Regeleinrichtung fuer Walzgerueste

Publications (1)

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US3570288A true US3570288A (en) 1971-03-16

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US776303A Expired - Lifetime US3570288A (en) 1967-10-21 1968-10-18 Rolling-mill assembly with improved control system

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US (1) US3570288A (enrdf_load_stackoverflow)
AT (1) AT296197B (enrdf_load_stackoverflow)
BE (1) BE722275A (enrdf_load_stackoverflow)
CH (1) CH472917A (enrdf_load_stackoverflow)
DE (1) DE1602033A1 (enrdf_load_stackoverflow)
DK (1) DK122107B (enrdf_load_stackoverflow)
FR (1) FR1596628A (enrdf_load_stackoverflow)
GB (1) GB1243828A (enrdf_load_stackoverflow)
LU (1) LU57124A1 (enrdf_load_stackoverflow)
NL (1) NL6814409A (enrdf_load_stackoverflow)
NO (1) NO127902B (enrdf_load_stackoverflow)
SE (1) SE329985B (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736782A (en) * 1969-10-22 1973-06-05 Hitachi Ltd Thrusting devices for rolling mills
US3817068A (en) * 1972-05-20 1974-06-18 F Meyer Roll gap and gap error monitoring device
US3850015A (en) * 1972-05-20 1974-11-26 Ver Flugtechnische Werke Roll gap detection
US3882709A (en) * 1972-10-16 1975-05-13 Nippon Steel Corp Method for controlling the profile of workpieces on rolling mills
US3964848A (en) * 1973-09-15 1976-06-22 Hermann Berstorff Maschinenbau Gmbh Calendering of synthetic plastics film
US3974672A (en) * 1975-09-19 1976-08-17 Herbst John F Mill hydraulic screw-down
US4054043A (en) * 1976-12-02 1977-10-18 Blaw-Knox Foundry & Mill Machinery, Inc. Closed loop integrated gauge and crown control for rolling mills
US4059794A (en) * 1974-07-15 1977-11-22 British Steel Corporation Method and apparatus for monitoring pass alignment in rolling mills
US4523444A (en) * 1982-12-13 1985-06-18 Fuchs Jr Francis J Methods of and apparatus for controlling the gap between a mandrel and die during extrusion
US4979556A (en) * 1989-04-04 1990-12-25 Hunter Engineering Company, Inc. Thickness control for a continuous caster
US5297408A (en) * 1991-02-19 1994-03-29 Keiichiro Yoshida Method of an apparatus for controlling hydraulic rolling reduction in a rolling mill
US5533371A (en) * 1991-02-01 1996-07-09 Lauener Engineering, Ltd. Measurement device for roll gap control and process for its operation
US20020078729A1 (en) * 2000-11-03 2002-06-27 Rolf Bunten Multi-high roll stand
US20120246917A1 (en) * 2011-04-01 2012-10-04 Ihi Corporation Continuous press apparatus for electrode band plate

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5125429B2 (enrdf_load_stackoverflow) * 1971-11-16 1976-07-30
DE2701593C2 (de) * 1977-01-15 1986-07-10 Wilhelm Hegenscheidt Gmbh, 5140 Erkelenz Verfahren zum Maßwalzen von Rotationskörpern und Walzgerüst zur Durchführung des Verfahrens
DE3109536C3 (de) * 1981-03-13 1994-04-14 Escher Wyss Ag Regelanordnung für ein Quarto-Metallwalzwerk
DE4141260A1 (de) * 1991-12-14 1993-06-17 Ibn Gmbh Dresden Einrichtung zum messen des achsabstandes von walzen zueinander
DE4226158C2 (de) * 1992-08-07 2003-04-10 Kloeckner Humboldt Wedag Verfahren und Anlage zur Druckbehandlung körnigen Gutes
ES2359805T3 (es) 2001-12-12 2011-05-27 Sms Siemag Ag Dispositivo para mediar el intersticio entre cilindros, que está comprendido entre los cilindros de trabajo de una caja de laminación en frío o en caliente.

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736782A (en) * 1969-10-22 1973-06-05 Hitachi Ltd Thrusting devices for rolling mills
US3817068A (en) * 1972-05-20 1974-06-18 F Meyer Roll gap and gap error monitoring device
US3850015A (en) * 1972-05-20 1974-11-26 Ver Flugtechnische Werke Roll gap detection
US3882709A (en) * 1972-10-16 1975-05-13 Nippon Steel Corp Method for controlling the profile of workpieces on rolling mills
US3964848A (en) * 1973-09-15 1976-06-22 Hermann Berstorff Maschinenbau Gmbh Calendering of synthetic plastics film
US4059794A (en) * 1974-07-15 1977-11-22 British Steel Corporation Method and apparatus for monitoring pass alignment in rolling mills
US3974672A (en) * 1975-09-19 1976-08-17 Herbst John F Mill hydraulic screw-down
US4054043A (en) * 1976-12-02 1977-10-18 Blaw-Knox Foundry & Mill Machinery, Inc. Closed loop integrated gauge and crown control for rolling mills
US4523444A (en) * 1982-12-13 1985-06-18 Fuchs Jr Francis J Methods of and apparatus for controlling the gap between a mandrel and die during extrusion
US4979556A (en) * 1989-04-04 1990-12-25 Hunter Engineering Company, Inc. Thickness control for a continuous caster
US5533371A (en) * 1991-02-01 1996-07-09 Lauener Engineering, Ltd. Measurement device for roll gap control and process for its operation
US5297408A (en) * 1991-02-19 1994-03-29 Keiichiro Yoshida Method of an apparatus for controlling hydraulic rolling reduction in a rolling mill
US20020078729A1 (en) * 2000-11-03 2002-06-27 Rolf Bunten Multi-high roll stand
US20120246917A1 (en) * 2011-04-01 2012-10-04 Ihi Corporation Continuous press apparatus for electrode band plate

Also Published As

Publication number Publication date
GB1243828A (en) 1971-08-25
BE722275A (enrdf_load_stackoverflow) 1969-03-14
SE329985B (enrdf_load_stackoverflow) 1970-11-02
LU57124A1 (enrdf_load_stackoverflow) 1969-01-27
DE1602033A1 (de) 1970-04-23
NL6814409A (enrdf_load_stackoverflow) 1969-04-23
NO127902B (enrdf_load_stackoverflow) 1973-09-03
DK122107B (da) 1972-01-24
CH472917A (de) 1969-05-31
AT296197B (de) 1972-02-10
FR1596628A (enrdf_load_stackoverflow) 1970-06-22

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