US3101016A - Rolling mills - Google Patents

Rolling mills Download PDF

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Publication number
US3101016A
US3101016A US10977A US1097760A US3101016A US 3101016 A US3101016 A US 3101016A US 10977 A US10977 A US 10977A US 1097760 A US1097760 A US 1097760A US 3101016 A US3101016 A US 3101016A
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United States
Prior art keywords
stand
strip
speed
rolls
stands
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Expired - Lifetime
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US10977A
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English (en)
Inventor
Gill Hedley
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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
    • 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
    • B21B37/48—Tension control; Compression control
    • B21B37/50—Tension control; Compression control by looper control

Definitions

  • This invention relates to rolling mills and is particularly concerned with the control of a multi-stand rolling mill. While the invention has chief application to the cold roll- 3,101,016 Patented Aug. 20, l 953 and hence a change in speed of the strip leaving the first stand and entering the second stand. This in turn alters the reduction efiected at the second and subsequent stands of the mill, so that the strip leaving the millas a whole may not have the desired thickness. It is therefore necessary, either to adjust one or more of the other stands of the mill or to supply automatic gauge control on at least the last stand of the mill, as Well as the-first stand. Duplication of the automatic control system is expensive.
  • An object of this invention is to provide a means for preventing the adjustment of the roll setting on any stand, but more particularly the first stand, from affecting the operation of subsequent stands.
  • a multistand rolling mill has on one of the stands preceding the last stand in the train a control system for controlling to a desired value the speed of the strip leaving the stand, irrespective of adjustments to the roll setting of that stand.
  • the roll setting of the selected stand can then be adjusted, during rolling, for example in order to compensate for variations in thickness of the incoming strip, without affecting the operation of succeeding stands.
  • the stand provided with automatic strip speed control has a gauge control system for automatically maintaining substantially constant the thickness of the strip leaving the stand.
  • FIGURE 1 diagrammatically illustrates the mill
  • FIGURE 2 schematically shows the control system for one of the stands, preferably the first stand in the train, and
  • FIGURE 3 illustrates a tensiometer for the strip.
  • the mill consists of a number of stands, of which only the first two and the last stand is illustrated.
  • Each stand is represented by a pair of work rolls 12, 13; 12a, 13a; 12b, 131), a drive motor 14, 14a, 1 21] and a screwdown motor and control gear therefor 15, 15a, 15b.
  • the various stands are set up so that each reduces the strip appropriately to produce a desired overall reduction in the mill.
  • the interstand tensions are carefully selected, since the reduction effected at any one stand depends, not only on the roll setting of that stand, but also on the tensions in the strip at each side of the stand.
  • at least one of the stands must be controlled during rolling either by hand or automatically. This adjustment is usually etfected by controlling the roll setting on the first stand, for example to eradicate changes in thickn ss in the strip entering the mill.
  • FIGURE 2 illustrates one way in which the speed of the strip leaving the rolls 1-2, 13 may be maintained constant.
  • a tacho-generator 16 is driven by a roller 17 in contact with and driven by the strip 18 at the exit side of the rolls 12, 13.
  • Roller 17 may be the roller of a tensiometer, as illustrated in FIGURE 3.
  • the DC. signal from the generator 16, which is proportional to the strip speed, is applied in opposition to the voltage from potentiometer 26 to the input of a high-gain amplifier 21.
  • Potentiometer 26 is adjustable by hand to a value representing the desired strip speed, so that the input signal to amplifier 21 is dependent on the divergence of the strip speed from the desired value.
  • Amplifier .21 feeds the field winding 22 of a generator 23, the armature of which is connected to the armature of the motor 14 driving the rolls 12, 13. If the speed of the strip 18 changes, due for example to alteration of the screwdown of the rolls 12, 13, the armature voltage of motor 1 is altered to change the speed of rolls 12, 13 until the strip speed is returned substantially to the value set by the potentiometer 20. 1
  • the screwdown of rolls 12, 13 is automatically adjusted to maintain substantially constant the thickness of the strip leaving the stand.
  • This adjustment may be effected by hand'but is preferably eitected by an automatic control system such as that described in US. Patent 2,726,54l to R. B. Sims, and illustrated for convenience in FIGURE 2.
  • Sims describes a circuit for generating an electric signal representing the departure of the strip thickness (71) from the desired strip thickness (h) and this error signal is shown in FIGURE 2 as applied to the motor and control circuit 15 to cause the screwdown to be adjusted to maintain the error substantially zero. While reference should be made to Sims for a more detailed description of the circuit, that circuit will now be briefly described for convenience.
  • a slider 24 on a resistor R1 is coupled to the screws of the rolls 12, 13 so that the voltage developed between the slider 24 and a second slider 25 on resistor R1 is proportional to the roll setting (S of the rolls 12, 13, resistor R1 being energised by a battery B1.
  • a Wheatstone bridge network 25 is constituted by four resistance strain gauges supported on a block between the checks for the roll 12 and the screw.
  • the bridge 26 is energised by a battery B3 and the voltage from the bridge is proportional to the separating force (F) generated in the stand.
  • a second resistor R2, energised by battery B2 has a contact 27 which can be adjusted by hand in accordance with the desired thickness of the strip (11').
  • the contacts 24, 25, 27 and the bridge 26 are connected in series so that the voltage developed across lines 28, 29 is equal to F/M+S -h', where M is the spring factor of the stand,
  • the speed of the strip 18 leaving the rolls 12, 13 is, of course, related to the tension in the strip 18 between the rolls 12, 13 and the rolls 12a, 13a. If the speed is kept constant then the tension will be held within narrow limits, and vice versa.
  • the tacho-generator 16 of FIGURE 2 is replaced by a conventional strip tensiometer, represented by a jockey pulley 34 biased upwardly against the strip 18 by a spring 35and coupled .to the sliding contact 36 of a potentiometer 37.
  • the voltage on sliding contact as is then dependent on the interstand tension and is applied in opposition to the voltage from potentiometer 20 (FIGURE 2) to control the armature voltage of motor 14, as before, in order to maintain the tension substantially constant.
  • the signal from amplifier 21, when that amplifier is controlled by strip speed or tension is employed to control the speed-torque characteristic of motor 14.
  • the armature voltage is kept constant but the inclination of the speed-torque line V is varied to adjust the speed of the motor for constant torque.
  • driving means connected to each pair of said rolls for driving each of said rolls in opposite directions from one another, a gauge control system controlling the roll sett ing of at least one stand preceding a last stand of said plurality of stands to maintain the thickness of a strip of material leaving said one stand at substantially a constant value, a speed 5 control system connected to said driving means for controlling the speed of the rolls of said one stand and responsive to the speed of the strip of material leaving said one stand for maintaining a constant speed of the material leaving said one stand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US10977A 1959-02-26 1960-02-25 Rolling mills Expired - Lifetime US3101016A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6701/59A GB885784A (en) 1959-02-26 1959-02-26 Improvements in or relating to rolling mills

Publications (1)

Publication Number Publication Date
US3101016A true US3101016A (en) 1963-08-20

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US10977A Expired - Lifetime US3101016A (en) 1959-02-26 1960-02-25 Rolling mills

Country Status (8)

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US (1) US3101016A (xx)
AT (1) AT225655B (xx)
BE (1) BE588024A (xx)
CH (1) CH363954A (xx)
DE (1) DE1402641A1 (xx)
FR (1) FR1249149A (xx)
GB (1) GB885784A (xx)
LU (1) LU38301A1 (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3162069A (en) * 1961-10-27 1964-12-22 Allegheny Ludlum Steel Method and apparatus for metal rolling
US3170344A (en) * 1961-09-19 1965-02-23 Gen Electric Method and apparatus for controlling the thickness of rolled strip material
US3196646A (en) * 1961-10-30 1965-07-27 Armco Steel Corp Method and apparatus for maintaining substantially constant strip gauge in a tandem mill
US3457747A (en) * 1965-12-28 1969-07-29 British Iron Steel Research Rolling mills
US3677045A (en) * 1968-11-19 1972-07-18 Nippon Kokan Kk Method of feed-forwardly controlling a tandem rolling mill
US4341259A (en) * 1978-12-29 1982-07-27 W. F. Lauener Ag Method for speed control of a continuous metal strip casting machine and rolling mill arrangement, and system controlled according to this method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1284922B (de) * 1963-03-14 1968-12-12 Schloemann Ag Verfahren zum Nachstellen von Walzgeruesten in kontinuierlichen Walzstrassen, insbesondere in Mittelstahlstrassen
DE1269980B (de) * 1964-04-11 1968-06-12 Schloemann Ag Kontinuierliche Walzenstrasse zum Auswalzen von Feinstahl oder Draht

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1814354A (en) * 1928-12-15 1931-07-14 William R Webster Metal rolling mill screw down control
US2100653A (en) * 1935-09-27 1937-11-30 Gen Electric Control system
US2137611A (en) * 1933-10-20 1938-11-22 Aluminum Co Of America Gauge control apparatus
US2300990A (en) * 1938-08-17 1942-11-03 Westinghouse Electric & Mfg Co Combined tension and screw-down control for strip mills
US2726541A (en) * 1951-11-27 1955-12-13 Sims Raymond Bernard Measuring apparatus for rolling or drawing sheet or strip material
US2834927A (en) * 1953-11-18 1958-05-13 Allis Chalmers Mfg Co Motor control system responsive to counter electromotive force
US2851911A (en) * 1954-01-26 1958-09-16 British Iron Steel Research Rolling mills
US2883895A (en) * 1954-10-15 1959-04-28 Carl A Vossberg Rolling mill thickness control system
US2929009A (en) * 1951-06-21 1960-03-15 William J Ruano Motor control systems
US3036480A (en) * 1957-07-10 1962-05-29 Electron Machine Corp Automatic control of multi-stand rolling mills

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1814354A (en) * 1928-12-15 1931-07-14 William R Webster Metal rolling mill screw down control
US2137611A (en) * 1933-10-20 1938-11-22 Aluminum Co Of America Gauge control apparatus
US2100653A (en) * 1935-09-27 1937-11-30 Gen Electric Control system
US2300990A (en) * 1938-08-17 1942-11-03 Westinghouse Electric & Mfg Co Combined tension and screw-down control for strip mills
US2929009A (en) * 1951-06-21 1960-03-15 William J Ruano Motor control systems
US2726541A (en) * 1951-11-27 1955-12-13 Sims Raymond Bernard Measuring apparatus for rolling or drawing sheet or strip material
US2834927A (en) * 1953-11-18 1958-05-13 Allis Chalmers Mfg Co Motor control system responsive to counter electromotive force
US2851911A (en) * 1954-01-26 1958-09-16 British Iron Steel Research Rolling mills
US2883895A (en) * 1954-10-15 1959-04-28 Carl A Vossberg Rolling mill thickness control system
US3036480A (en) * 1957-07-10 1962-05-29 Electron Machine Corp Automatic control of multi-stand rolling mills

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170344A (en) * 1961-09-19 1965-02-23 Gen Electric Method and apparatus for controlling the thickness of rolled strip material
US3162069A (en) * 1961-10-27 1964-12-22 Allegheny Ludlum Steel Method and apparatus for metal rolling
US3196646A (en) * 1961-10-30 1965-07-27 Armco Steel Corp Method and apparatus for maintaining substantially constant strip gauge in a tandem mill
US3457747A (en) * 1965-12-28 1969-07-29 British Iron Steel Research Rolling mills
US3677045A (en) * 1968-11-19 1972-07-18 Nippon Kokan Kk Method of feed-forwardly controlling a tandem rolling mill
US4341259A (en) * 1978-12-29 1982-07-27 W. F. Lauener Ag Method for speed control of a continuous metal strip casting machine and rolling mill arrangement, and system controlled according to this method

Also Published As

Publication number Publication date
AT225655B (de) 1963-02-11
CH363954A (fr) 1962-08-31
DE1402641A1 (de) 1969-04-30
BE588024A (fr) 1960-06-16
FR1249149A (fr) 1960-12-23
LU38301A1 (xx)
GB885784A (en) 1961-12-28

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