US3461705A - Apparatus for controlling the deflection of the rolls of a rolling mill - Google Patents

Apparatus for controlling the deflection of the rolls of a rolling mill Download PDF

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Publication number
US3461705A
US3461705A US593955A US3461705DA US3461705A US 3461705 A US3461705 A US 3461705A US 593955 A US593955 A US 593955A US 3461705D A US3461705D A US 3461705DA US 3461705 A US3461705 A US 3461705A
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Prior art keywords
rolls
roll
work
bending
rolling
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Expired - Lifetime
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US593955A
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English (en)
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Karl Josef Neumann
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Moeller and Neumann Verwaltungsgesellschaft Offene GmbH
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Moeller and Neumann Verwaltungsgesellschaft Offene GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B29/00—Counter-pressure devices acting on rolls to inhibit deflection of same under load, e.g. backing rolls ; Roll bending devices, e.g. hydraulic actuators acting on roll shaft ends

Definitions

  • the present invention pertains to the art of rolling mills, and more particularly to an improved apparatus for controlling the deflection of the rolls of a rolling mill.
  • the term fourbig when used to describe a rolling mill refers to a mill having a pair of opposed working rolls each provided with a back-up roll positioned directly opposite its work contacting side.
  • Other types of mills are known in which one or more intermediate rolls are positioned between the working rolls and their respective back-up rolls.
  • back-up rolls will denote those rolls that are directly in contact with the working rolls, without regard to whether they would normally be considered back-up or intermediate rolls.
  • the working rolls make contact with the back-up rolls at selected small areas either the ends of the rolls (in the case of positive bending moments applied to the working rolls or of negative bending moments applied to the back-up rolls) or at the middle of the rolls (in the case of negative bending moments applied to work-rolls or positive moments applied to the back-up rolls). Consequently, when rolling pressure is applied by the mill, pressure between the working rolls and their respective back-up rolls is increased at the small contact areas at either the ends of the rolls or the middle of the rolls.
  • the present invention eliminates the aforementioned difliculties and provides a method and apparatus for adjusting the bending moments acting on the back-up or intermediate rolls, as well as on the working rolls.
  • the rolling force is distributed uniformly over the width of the sheet or strip being rolled. Additionally, because of the manner in which the bending curves of the rolls are adjusted, the locally limited pressure contact areas between the back-up or intermediate rolls and the working rolls is eliminated and the rolls have generally uniform pressure contact throughout their length.
  • a method for adjusting the deflecting of the rolls of a rolling mill of the general type described comprises applying predetermined bending moments to both the working roll and the back-up roll in contact therewith, to produce a desired deflection in the rolls.
  • the bending moments are chosen so that the deflection resulting in the rolls produces a substantially uniform pressure contact throughout their length. In this manner increased wear between the rolls is eliminated.
  • apparatus for adjusting the deflection of the rolls of a rolling mill of the general type described.
  • This apparatus includes first means for applying a predetermined bending moment to the working roll, and second means associated with the backup roll for applying a corresponding bending moment thereto.
  • the bending moments applied are such that the deflections resulting in the rolls produces a substantially uniform pressure contact along the axial lengths of the rolls.
  • a primary object of the present invention is the provision of a method of controlling the deflection of the rolls of a rolling mill in a manner which eliminates the problems previously encountered with limited areas of high pressure contact between the working rolls and their back-up rolls.
  • An additional object is the provision of a method which permits the production of rolled sheet products that are of substantially uniform thickness.
  • a further object is the provision of apparatus for controling the deflection of the rolls of a rolling mill so that the rolling force is distributed uniformly throughout the line of contact between the working roll and the back-up roll.
  • a still further object is the provision of apparatus to produce a variable predetermined deflection in the rolls of a rolling mill.
  • FIGURE 1 is an elevational view, somewhat diagrammatic, of a four-high rolling mill and showing a first embodiment of the present invention
  • FIGURES 2 and 3 are partial elevational perspective views, somewhat diagrammatic, showing two additional embodiments of the present invention.
  • FIGURES 4 and 5 are elevational views of a four-high rolling mill showing, in somewhat diagrammatic form, two additional embodiments of the present invention.
  • FIGURES 6-9 are partial elevational views, somewhat diagrammatic, showing four additional embodiments of the present invention.
  • FIGURE 1 shows a four-high stand comprising the back-up rolls 1 and 2, the opposed work rolls 3 and 4, the frames 5 and 6, the back-up roll chocks 7 and 8, or 9 and 10, and the work roll chocks 11 and 12, or 13 and 14.
  • the extensions of the roll necks as well as the rod parts are merely indicated by solid lines.
  • the same reference numerals are used to denote the same or corresponding parts.
  • FIGURE 1 one preferred embodiment of a device for influencing the bending curve of the rolls is illustrated.
  • This device is comprised of hydraulic power units 15, for example, double acting pistions, mounted on the frames 5 and 6.
  • the pulling or pushing rods 16 of these power units act on the extended necks 1a or 2a of the back-up rolls 1 and 2. This portion of the device is already known in the art.
  • the invention is characterized by length adjustable pull or push rods 17 which extend between the necks 1a, 2a of the back-up rolls and the necks 3a, 4a of the work rolls 3, 4.
  • the rods 17 are of adjustable length in order to take into account changes in roll diameter resulting from the grinding off of the rolls. It is readily seen that not only at the back-up roll necks 1a, 2a, but also at the work roll necks 3a, 4a, positive bending moments are exerted when the pressure chambers 15a of the hydraulic power units are placed under pressure. These positive bending moments are indicated by solid arrows. The dashline arrows indicate negative bending moments which are produced when the outer pressure chambers of the hydraulic power units 15 are pressurized.
  • supplemental hydraulic power units 20 are added to the pulling or pushing rods 17 between the back-up and the work rolls.
  • the pistons of these power units are pressure contacted on both sides and adapted to be locked. In this manner it is possible to adjust the ratio of the bending moments which are applied to the back-up rolls and the work rolls.
  • the pistons of the supplemental hydraulic power units 20 locked, but the pressure in the pressure chambers 15a of the main power units 15 are increased.
  • FIGURE 2 the arrangement according to FIGURE 7 has been further developed with the use of a known arrangement.
  • a single hydraulic power unit 15 is arranged at the upper frame yoke. This unit is guided in a vfloating manner over the guide bars 24 of the stand.
  • the piston rod of the power unit is pivotally connected at rod 16 at the extended necks 1a of the back-up roll 1.
  • the cylinder of the power unit is positively connected through a cross-beam 26 to which is attached a pair of push rods 28 connected through a cross-beam 30 to the extended necks 2a of the other back-up roll.
  • the pressure chamber 15a of the hydraulic power unit is put under pressure, positive bending moments are introduced into both of the back-up rolls.
  • the bending curve of the work rolls 3, 4 is influenced, as shown in the example of FIGURE 7, by hydraulic power units 22 acting between the chocks of the work rolls.
  • FIGURE 3 The embodiment of FIGURE 3 is similar to that shown in FIGURE 2. However, in this embodiment supplemental hydraulic power units are utilized to apply bending moments to the work rolls, instead of the power units 22.
  • hydraulic power units 20 are associated with pull or push rods 17 which travel as an extension of the rods 16 between the extended necks 1a or 2a of the back-up rolls and the necks 3a or 4a of the work rolls.
  • the sense of rotation of the correcting bending moments to be introduced may be selectively set, for this purpose the main power unit 15 must be adapted to be pressurized on both sides.
  • a further development according to the invention consists in that instead of the power units 22 between the chocks 12, 14 of the work rolls the piston rod 16 of the floating power unit 15 is connected as an extension beyond its contact point at the back-up roll with the necks 3a of the subsequent work roll 3 and the necks 4a of the other work roll 4 over a supplemental power unit 20 with the pair of pull or push rods 28 to the other back-up roll.
  • the pistons of the supplemental power units 20 are adapted to be pressurized on both sides and locked in a desired position.
  • FIGURES 4 and 8 show embodiments in which the supplemental hydraulic power units 20 are eliminated without loss of the ability of selectively reversing the sense of rotation of the correcting bending moments.
  • the hydraulic power units 15 may be fixed to the frames 5 (FIGURE 4) or arranged in a floating manner at the frames 6 (FIGURE 8).
  • the pull and push rods 16 of the hydraulic power units of both of these embodiments are pivotally connected approximately at the level of the work rolls 3, 4, to an oscillating or twoarm lever 30.
  • the outer ends of the levers 30 are connected to the extended necks 1a or 2a of the backup rolls.
  • the two-arm levers 30 are otherwise positioned by intermediate supports 32 which lead to the contact points of the back-up roll into an approximately horizontal position.
  • the rods 34 are adjustably guided as slide members in slots 36 of the levers.
  • the pull or push rods 16 cannot cross the extended backup roll necks 1a, 2a, and for this purpose they are constructed as double rods in a manner not shown in detail.
  • the double rods being supported by cross-beams and connected to a pair of levers 30 each.
  • the inner ends of the levers 30 are pivotally connected to the ends of the work roll chocks 11, 13 or 12, 14.
  • the chocks are provided withslots or openings into which the levers extend for operative engagement.
  • the reaction of the bending forces goes into the screws of the screw-down or setting device. This makes the initial setting under load, as it is usually done during cold rolling, more diflicult. Complications are also encountered when the rolling mill is provided with an automatic roll gap control in which the roll forces are measured by means of pressure gauges placed under the pressure screws. The reaction forces of the device for correcting the bending curves must then be made ineflfective to permit the automatic roll gap control to function properly.
  • the invention proposes that the beams 40 between the pressure screws 42 of the screw-down device and the chocks 7 of the backup rolls 1 constitute supports for the hydraulic power units 15.
  • these hydraulic power units are pivotally supported in slots 40a of beams 40 at 44.
  • the transfer of the bending forces by means of levers 30 corresponds to the embodiment of FIGURE 4.
  • the construction with the support beams 40 can be applied to all other embodiments described so far.
  • FIGURE 9 A further possibility of maintaining the bending forces in a closed system, as discussed with reference to FIG- URE 5, is shown in FIGURE 9.
  • the hydraulic power units 15 are arranged laterally of the chocks 8 of the back-up rolls 1 and the chocks of each back-up roll are connected to each other by a bridge 46 in a manner which prevents them from tilting or twisting. It is also true here that besides the beam construction shown any other power transfer is applicable including the arrangement of floating hydraulic power units 15.
  • FIGURE 6 shows an embodiment without hydraulic power units connected at the frames so that the disassembly of the rolls is facilitated and the rod arrangement is simplified.
  • the device for producing the correcting bending moments according to this embodiment of the invention consists merely of length-adjustable pull or push rods 50, 52 with built-in power units 20.
  • the rods extend between the extended necks 1a or 2a of the back-up rolls 1, 2 and the necks 4a or 3a, or 11 and 13, of those work rolls 4 or 3, which, as viewed from the particular back-up roll, are located on the outer side of the rolling gap.
  • the stroke of the power units 20 must, in this case, comprise the entire adjusting distance of the rolls because the rods 50, 52 cross the rolling gaps.
  • a rod in the embodiment shown, the lower rod 52, is suitably provided behind the power unit 20 with a cross-beam 54 which is connected to the piston rod and over a rod pair 52a and an additional cross-beam 56 to the necks 3a of the upper work roll 3.
  • the arrangement according to FIGURE 6 also permits correcting bending moments of either direction or rotation to be applied to both rolls on the same side of the roll gap. If, for example, the outer pressure chamber 20a of the power units 20 is placed under pressure the rods 50, 52 are pressure rods and exert forces on the roll necks which produce positive bending moments for correcting the bending line of the rolls. In case the other pressure chamber is pressurized negative bending moments arise. Due to the coupling of the rolls of different gap sides, positive or negative bending moments in the same direction are produced in the rolls on each roll gap side in spite of oppositely directed push or pull forces in the rods 50, 52.
  • the pistons of the hydraulic power units 20 can be hydraulically locked, if desired, after a certain preliminary pressure is provided to produce positive bending moments. Then, if during rolling the backup rolls bend under the roll forces, the extended necks 1a, 2a of the back-up rolls push through the push rods 50, 52 and the locked power, units 20, in the sense of producing positive bending moments on the necks 4a or 3a of the work rolls. Depending on the work rolls resistance to bending moments, or the given lever ratios, there arises a reverse efiect of the forces from the work rolls into the push rods 50, 52 in the sense of producing positive bending moments at the pins 1a, 2a of the backup rolls.
  • means could be provided to permit the pull or push rods to be easily pivoted away by means of intermediate rods at least at the drive free ends or those ends of the work rolls which are first pulled from the frame during the roll change.
  • the devices for correcting the roll bending curves may operate in a known manner with a prebending of the rolls, although the hydraulic forces can be set only upon starting of the rolling operation and may be regulated or controlled with reference to the roll force.
  • the regulation may be adjusted by thickness measuring devices distributed over the width of the flat products. Since during cold rolling deviations of the strips from the plane condition are easily recognizable with the naked eye a visual control alone would be suflicient here.
  • a rolling mill including a frame, a pair of opposed work contacting rolls and at least two back-up rolls carried by said frame, and means for varying the spacing of said work contacting rolls, the improvement comprising: first means for adjustably applying a pre determined bending moment to said work contacting rolls,
  • said second means include a movable piston carried by said frame and having a connection between said piston and at least one of the ends of said back-up rolls
  • said first means include an adjustable connecting member extending between the said at least one end of said one back-up roll and at least one end of one of said work contacting rolls.
  • said second means includes a movable piston carried by said frame and having a connection between said piston and at least one of the ends of said back-up rolls, and wherein said first means includes piston means positioned between the ends of said work contacting rolls.
  • said second means includes a lever having one end drivingly connected with the end of one of said work contacting rolls
  • said first means includes means drivingly connecting the other end of said lever with the end of one of said back-up rolls, and adjustable force producing means connected to said lever at a point intermediate the ends thereof.
  • first and second means include piston and cylinder power means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US593955A 1965-11-17 1966-11-14 Apparatus for controlling the deflection of the rolls of a rolling mill Expired - Lifetime US3461705A (en)

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Application Number Priority Date Filing Date Title
DEV0029750 1965-11-17

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US (1) US3461705A (forum.php)
BE (1) BE689367A (forum.php)
DE (1) DE1452152B2 (forum.php)
FR (1) FR1500593A (forum.php)
GB (1) GB1144817A (forum.php)
SE (1) SE316738B (forum.php)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599466A (en) * 1967-10-10 1971-08-17 Spidem Ste Nle Method of and apparatus for bending the backing-up rolls of four-high rolling mills and the work rolls of two-high rolling mills
US3855830A (en) * 1969-08-04 1974-12-24 Hitachi Ltd Method and apparatus for controlling plate thickness in a rolling mill
US4480459A (en) * 1981-11-11 1984-11-06 Escher Wyss Aktiengesellschaft Rolling mill
US12415325B2 (en) * 2021-01-11 2025-09-16 Beihang University Real-time adjustment device for the width and thickness of impregnated fiber bundles

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1351074A (en) * 1971-02-15 1974-04-24 Hitachi Ltd Rolling mills
JPS5366849A (en) * 1976-11-26 1978-06-14 Hitachi Ltd Rolling machine
DE3109536C3 (de) * 1981-03-13 1994-04-14 Escher Wyss Ag Regelanordnung für ein Quarto-Metallwalzwerk
JPS6057402B2 (ja) * 1981-05-21 1985-12-14 三菱重工業株式会社 圧延機
DE3145526C2 (de) * 1981-11-17 1985-10-31 Sulzer-Escher Wyss AG, Zürich Walzgerüst
DE3331335A1 (de) * 1983-08-31 1985-03-14 Brown, Boveri & Cie Ag, 6800 Mannheim Verfahren und schaltungsanordnung zur planheitsregelung in kaltwalzwerken
DE3437601A1 (de) * 1984-10-13 1986-04-17 SMS Schloemann-Siemag AG, 4000 Düsseldorf Sechs-walzen-walzwerk
DE3736683C3 (de) * 1987-10-29 2003-09-11 Froehling Josef Gmbh Mehrrollen-Walzgerüst
DE3912303C2 (de) * 1989-04-14 1994-08-04 Troester Maschf Paul Kalander für die Herstellung von Dichtungsplatten
DE4331261C2 (de) * 1992-10-15 1995-04-20 Achenbach Buschhuetten Gmbh Walzgerüst

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250105A (en) * 1958-08-25 1966-05-10 United Eng Foundry Co Method of and apparatus for processing metal strip
US3318124A (en) * 1964-12-10 1967-05-09 Westinghouse Electric Corp Workpiece shape control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250105A (en) * 1958-08-25 1966-05-10 United Eng Foundry Co Method of and apparatus for processing metal strip
US3318124A (en) * 1964-12-10 1967-05-09 Westinghouse Electric Corp Workpiece shape control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599466A (en) * 1967-10-10 1971-08-17 Spidem Ste Nle Method of and apparatus for bending the backing-up rolls of four-high rolling mills and the work rolls of two-high rolling mills
US3855830A (en) * 1969-08-04 1974-12-24 Hitachi Ltd Method and apparatus for controlling plate thickness in a rolling mill
US4480459A (en) * 1981-11-11 1984-11-06 Escher Wyss Aktiengesellschaft Rolling mill
US12415325B2 (en) * 2021-01-11 2025-09-16 Beihang University Real-time adjustment device for the width and thickness of impregnated fiber bundles

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Publication number Publication date
BE689367A (forum.php) 1967-04-14
DE1452152B2 (de) 1973-01-04
SE316738B (forum.php) 1969-11-03
GB1144817A (en) 1969-03-12
FR1500593A (fr) 1967-11-03
DE1452152A1 (de) 1968-11-28

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