US3795124A - Method of detecting and compensating for defects on rolling mill rolls and means for applying this method - Google Patents

Method of detecting and compensating for defects on rolling mill rolls and means for applying this method Download PDF

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Publication number
US3795124A
US3795124A US00357645A US3795124DA US3795124A US 3795124 A US3795124 A US 3795124A US 00357645 A US00357645 A US 00357645A US 3795124D A US3795124D A US 3795124DA US 3795124 A US3795124 A US 3795124A
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United States
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chocks
rolls
backing
hydraulic
rolling mill
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Expired - Lifetime
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US00357645A
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English (en)
Inventor
L Diolot
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Societe Nouvelle Spidem
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Societe Nouvelle Spidem
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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
    • B21B37/66—Roll eccentricity compensation systems

Definitions

  • the present invention relates to a method of detecting and compensating for defects on rolling mill rolls, and also a means for applying this method.
  • the operation is started by detecting the variations being produced as regards the spacing between two rolls by means of appropriate pick-up devices disposed in contact with the working rolls, the rolling mill turning idly and at slow speed. These variations are recorded on a suitable support, the driving of which is synchronized with the operation of the rolls in question.
  • the recording thus obtained is utilized for piloting a compensating operation, aiming at progressively correcting the spacing between the working rolls which have served for the recording, the rolling mill this time operating under load and at its normal speed.
  • the method and the means according to the invention are proposed for overcoming this disadvantage, while making the method as thus improved generally applicable to any rolling mill.
  • the only condition set for this rolling mill is that it is equipped with a regulating system, having a sufficiently reduced response time, for being able faithfully to obey the compensating impulses originating from judiciously disposed pick-up devices.
  • the value taken into consideration by each pickup device is no longer a length, as was always the case previously, when the spacing between the working rolls was measured by means of the said pick-up devices; according to the invention, the value is a fluid pressure which undergoes fluctuations in response to the fluctuations in the spacing between the working rolls during operation, this arrangement enabling these last-named fluctuations to be interpreted more faithfully than by means of a direct measurement.
  • each pick-up device is associated with one of the working chocks of the rolling mill, and not directly with the corresponding roll, as was the case in the aforesaid French Patent No. 1,541,086 of the applicants.
  • the displacements of each chock relatively to the housing of the rolling mill are thus permanently followed, these displacements representing the resultant of the cumulated influences of any type being exerted on this chock. It is then convenient to process and particularly to record separately the signals originating from each pick-up device, or even to totalize, before or after processing, the signals originating from two pick-up devices which are respectively associated with each of the chocks situated on the same side of the machine.
  • the hydraulic circuits in which are included the pres sure pick-up devices are entirely independent of the main circuit for the hydro-mechanical screwdown of the machine, contrary to what has been set forth in one of the embodiments of French Patent No. 1,541,086 in the name of the applicants, in which embodiment use was made of the variations in the fluid pressure obtained in the main screwdown system, as a function of the fluctuations in the spacing between the working rolls.
  • the backing-up rolls were specifically assumed to be in the favorable case previously mentioned, being driven in rotation in a direct manner; now this is far from always being the case and the embodiment in question could not eliminate the essentially random influence of imperfections in the backing-up rolls.
  • each pick-up device is formed by a pressure detector which could in particular be a hydraulic jack, supplied by a fluid source and serving normally for the balancing of the working rolls.
  • An appropriate member for example, a valve, permits each pick-up device to be isolated at will from the fluid supply source, thus capturing a constant quantity of fluid inside the jack, as well as in the pipe conduits and other apparatus which are downstream of the said member.
  • a visualization device for example a pressure gauge, as well as signal converting and recording arrangements.
  • each pick-up device is arranged in such a way that its fixed or stationary part is made fast with the housing of the rolling mill and it is by its movable part that the said pick-up device bears on the chock with which it is associated.
  • the jacks normally operated in the rolling mill and designed to ensure the balancing of the two working rolls of the machine, that is to say, to press each of them in suitable manner against the corresponding bearing cylinder, are preferably caused to serve as the pick-up devices. Only the arrangement of the pipelines for supplying fluid to the said jacks will be modified. in this manner, it is possible to avoid having the temporary installation on the machine of special pick-up devices designed for the recording operation, as was the case in the last-named U.S. patent.
  • the following procedure is adopted: by acting on the main control system for the hydro-mechanical screwdown of the machine, the latter is first of all opened to a sufficient extent, until the upper and lower working rolls are no longer in contact with one another, while ensuring that each working roll nevertheless remains pressed against its respective backing-up roll, because of the balancing jacks of the rolling mill. By means of suitably placed and appropriate stop valves, each of the said balancing jacks is then separated from its supply pipe.
  • a pressure recording apparatus is connected to each of thesaid jacks and the signals thus obtained may be directed towards an adding system. It is then found in respect of each jack that there is a quantity of oil locked in a very reduced volume, under a suitably chosen initial pressure.
  • the rolling mill is then caused to turn idly and at slow speed, taking good care to follow the recording during the complete rotational cycle of one of the backing-up rolls, preferably that of which the diameter is throught to he the larger.
  • the driving mechanism of the arrangement for re cording the fluctuations experienced by each of the working chocks is synchronized, mechanically or electrically, with the rotational movement of the corresponding bearing roll. In this way, it is certain that the fluctuations in the position of the chock, caused by the variations in the radius of the corresponding backingup roll, are directly picked up, while the fluctuations caused by the variations in the radius of the working roll are then of second order and consequently can be ignored.
  • preliminary measurements there is established once and for all the scale according to which the recordings thus obtained will have to be interpreted.
  • Each of the working chocks 5 comprises a shoulder 6 facing each of the uprights, which shoulder is designed to cooperate with the balancing jacks 7.
  • the balancing jacks 7 In the case shown in the Figure, it is assumed that, for the pair of upper rolls, it is by interaction between the respective working and support chocks that the working roll 2 is pressed against the backing-up roll 4.
  • the balancing jack 7 is received in the upper support chock 8 and, by hearing against this latter, it is able to act on the shoulder 6 associated therewith.
  • the hydraulic supply circuit for the two jacks 7 which are shown can with advantage be formed by a common fluid supply 10, an individual valve 11 for each of the jacks, a visualization apparatus, for example a pressure gauge 12, branched off from each of the individual supply conduits 13.
  • the pressure pick-up devices are to be seen at 15, each of which emit signals in the direction of an adding apparatus 16.
  • the pressure pickup device may be a Model GW-l3 or BOW-13 device marketed by SFlM, 13 Avenue M. Ramolfo-Garnier, 91 Massy, France.
  • the adding apparatus 16 in turn, may be a Model A 1597 differential amplifier manufactured by the Rochar Electronic Division of the Schlumberger Corporation, A U. S. firm.
  • said rolling mill being of the known type that has (a) a stand, (b) backing-up rolls, (c) first chocks supporting said backing-up rolls and movably held in said stand, (d) working rolls one associated with each backing-up roll, (e) second chocks supporting said working rolls and movably held with respect to said first chocks, and a regulating system, the improvement comrising,
  • A. means associated with each working roll and defining a closed space containing locked-in hydraulic fluid
  • sensing means connected to said means defining a closed space; said sensing means responding to pressure fluctuations in said hydraulic fluid caused by a fluctuating motion of said second chocks and storing same for later use by the regulating system.
  • said rolling mill being of the known type that has (a) a stand, (b) backing-up rolls, (c) first chocks supporting said backing-up rolls and movably held in said stand, (d) working rolls one associated with each backing-up roll, (e) second chocks supporting said working rolls and movably held with respect to said first chocks, and a regulating system, the improvement comprising,
  • A. means associated with each working roll and defining a closed space containing locked-up hydraulic fluid
  • sensing means connected to said means defining a closed space; said sensing means responding to pressure fluctuations in said hydraulic fluid caused by a fluctuating motion of said second chocks and storing same for later use by the regulating system.
  • said rolling mill being of the known type that has (a) a stand, (b) backing-up rolls, (c) first chocks supporting said backing-up rolls and movably held in said stand. (d) working rolls one associated with each backing-up roll, (e) second chocks supporting said working rolls and movably held with respect to said first chocks and a regulating system, the improve ment comprising,
  • A. means associated with each working roll and defining a closed space containing locked-in hydraulic fluid
  • hydraulic jack means in engagement with said second chocks and communicating with said means defining a closed space, said hydraulic jack means including a piston,
  • a method of detecting and compensating defects in the rolls of a rolling mill having working rolls, working roll-supporting chocks, backing-up rolls, backingup roll supporting chocks, a hydraulic pressure circuit for detecting fluctating motions of the working rollsupporting chocks and a regulating system connected with the working roll-supporting chocks comprising the following steps:
  • said rolling mill being of the known type that has (a) a stand, (b) backing-up rolls, (c) first chocks supporting said backing-up rolls and movably held in said stand, (d) working rolls, one associated with each backing-up roll, (e) second chocks supporting said working rolls and movably held with respect to said first chocks, (f) a regulating system, (g) hydraulic pressure means operatively connected to said second chocks, said hydraulic pressure means including jacks, one in engagement with each second chock, hydraulic compression chambers, each accommodating a separate jack and a hydraulic circuit for supplying hydraulic liquid to said hydraulic compression chambers, the position of each jack in its associated hydraulic compression chamber and the pressure in the latter being interdependent values, the improvement comprising A.
  • sensing means communicating with each said closed space, said sensing means responding to pressure fluctuations in said locked-in hydraulic fluid caused by a fluctuating motion of said second chocks and storing same for later use by the regulating system, whereby defects in said rolls are sensed during idle test runs of said rolling mill.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Continuous Casting (AREA)
US00357645A 1970-06-12 1973-05-07 Method of detecting and compensating for defects on rolling mill rolls and means for applying this method Expired - Lifetime US3795124A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7021796A FR2093412A5 (ja) 1970-06-12 1970-06-12

Publications (1)

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US3795124A true US3795124A (en) 1974-03-05

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Country Status (5)

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US (1) US3795124A (ja)
DE (1) DE2128738A1 (ja)
ES (1) ES391938A1 (ja)
FR (1) FR2093412A5 (ja)
GB (1) GB1343701A (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299104A (en) * 1979-02-28 1981-11-10 Mitsubishi Jukogyo Kabushiki Kaisha Method of controlling roll eccentricity of rolling mill and apparatus for performing the same method
US4910985A (en) * 1986-07-09 1990-03-27 Alcan International Limited Method and apparatus for the detection and correction of roll eccentricity in rolling mills
US6542240B2 (en) * 2001-03-30 2003-04-01 Alcan International Limited Method of identifying defective roll on a strip processing line
US20050061047A1 (en) * 2002-09-18 2005-03-24 Richard Laliberte Lamination process and apparatus for alkali metals or alloys thereof
US20070107482A1 (en) * 2003-07-30 2007-05-17 Bernd Zieser Rolling device
US20070245794A1 (en) * 2005-06-08 2007-10-25 Peter Brandenfels Device for Loading the Guide Surfaces of Bearing Chocks Supported in the Housing Windows of Rolling Stands

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331229A (en) * 1962-08-29 1967-07-18 Process and apparatus for eliminating the excentricity effect of rollers in hot and cold rolling mills for metal sheets
US3460365A (en) * 1966-02-21 1969-08-12 Davy & United Eng Co Ltd Rolling mills

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331229A (en) * 1962-08-29 1967-07-18 Process and apparatus for eliminating the excentricity effect of rollers in hot and cold rolling mills for metal sheets
US3460365A (en) * 1966-02-21 1969-08-12 Davy & United Eng Co Ltd Rolling mills

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299104A (en) * 1979-02-28 1981-11-10 Mitsubishi Jukogyo Kabushiki Kaisha Method of controlling roll eccentricity of rolling mill and apparatus for performing the same method
US4910985A (en) * 1986-07-09 1990-03-27 Alcan International Limited Method and apparatus for the detection and correction of roll eccentricity in rolling mills
US6542240B2 (en) * 2001-03-30 2003-04-01 Alcan International Limited Method of identifying defective roll on a strip processing line
US20050061047A1 (en) * 2002-09-18 2005-03-24 Richard Laliberte Lamination process and apparatus for alkali metals or alloys thereof
US7513136B2 (en) * 2002-09-18 2009-04-07 Bathium Canada Inc. Lamination process and apparatus for alkali metals or alloys thereof
US20070107482A1 (en) * 2003-07-30 2007-05-17 Bernd Zieser Rolling device
US7299673B2 (en) * 2003-07-30 2007-11-27 Sms Demag Ag Rolling device
US20070245794A1 (en) * 2005-06-08 2007-10-25 Peter Brandenfels Device for Loading the Guide Surfaces of Bearing Chocks Supported in the Housing Windows of Rolling Stands
US7426844B2 (en) * 2005-06-08 2008-09-23 Sms Demag Ag Device for loading the guide surfaces of bearing chocks supported in the housing windows of rolling stands

Also Published As

Publication number Publication date
FR2093412A5 (ja) 1972-01-28
GB1343701A (en) 1974-01-16
DE2128738A1 (de) 1971-12-16
ES391938A1 (es) 1973-06-16

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