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WO2003078729A1 - Procede de determination d'une force de ligne et de distribution d'une force de ligne constante entre deux rouleaux rotatifs - Google Patents

Procede de determination d'une force de ligne et de distribution d'une force de ligne constante entre deux rouleaux rotatifs

Info

Publication number
WO2003078729A1
WO2003078729A1 PCT/FI2003/000202 FI0300202W WO03078729A1 WO 2003078729 A1 WO2003078729 A1 WO 2003078729A1 FI 0300202 W FI0300202 W FI 0300202W WO 03078729 A1 WO03078729 A1 WO 03078729A1
Authority
WO
WIPO (PCT)
Prior art keywords
roller
mantle
rollers
nip
line force
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/FI2003/000202
Other languages
English (en)
Inventor
Erno Keskinen
Juha Miettinen
Ville Järvinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU2003212398A priority Critical patent/AU2003212398A1/en
Priority to EP03708294A priority patent/EP1497497A1/fr
Publication of WO2003078729A1 publication Critical patent/WO2003078729A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/36—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by radial displacement of the roll sleeve on a stationary roll beam by means of hydraulic supports
    • 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
    • B21B38/08—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-force
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D21G1/0026—Arrangements for maintaining uniform nip conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/05—Sleeved rolls with deflectable sleeves
    • B21B27/055—Sleeved rolls with deflectable sleeves with sleeves radially deflectable on a stationary beam by means of hydraulic supports

Definitions

  • the invention relates to clarifying the line force between two rotating rollers pressed against each other by calculation means or by measuring means.
  • the aim of the invention is to produce a calculation model in order to calculate stresses existing in the other roller caused by evenly distributed line force in the said roll.
  • the stresses of the other roller are worked out by calculation from a spot, where they can also be determined.
  • the compression force of roller by nip contact against another roller is previously adjusted into roller by means of pushing shoes arranged at a distance from each other, by means of which from roller inside the roller mantle has been pushed on the nip line. Since for the pushing shoes different pushing forces has been arranged, it has been possible to adjust the distribution of line force. The disadvantage of this is that only after observing the cross profile of the end product one has with great delay been able to correct the distribution of pushing forces of the pushing shoes and thus influence the distribution of line force.
  • the advantage of the method according to the invention is that the control of line force, i.e. nip pressure, improves decisively, since the corresponding stress distribution caused by uniform line force distribution in the other roller in the web lateral direction is presented by means of the calculation formula and corresponding stresses are also measured from said roller.
  • line force i.e. nip pressure
  • the cylinder inner surface of the roller to be measured it is, for instance, possible to measure from it by means of stress- strain flaps the stresses in axial and tangential directions.
  • the stresses of corresponding inner surface are also calculatory favourable to be determined, when bending, depression by nip contact and flattening due to line force are used as the cylinder roller load.
  • the process of paper manufacture is improved, where the quality of paper can be made smoother as before over the whole web breadth.
  • the crowning shapes of rollers can be made to correspond better to the need and it is possible to determine more accurately the necessary correction of crowning. If there is in the factory an active, for instance by means of pushing shoes working load determining the line force in real time, by means of the method as per the invention an adjustment in real time for this is achieved, when in the counter roller continuous measuring of stress is arranged.
  • Fig. 1 shows the pair of rollers from the side.
  • Fig. 2 shows a part of the pair of rollers in profile, where there is in the other roller a pushing shoe arrangement, by means of which the line force distribution is adjusted.
  • Fig. 3 shows the roller stress distribution horizontally.
  • Fig. 4 shows distribution of line force of the pair of rollers.
  • Fig. 5 shows the roller crowning shape.
  • Fig. 6 shows the distribution of pushing force.
  • Figure 1 shows the rotatable pair of rollers 1,2 of a paper machine supported by means of body 4 so that at least the roller fastening with bearings in body 4 can be moved vertically.
  • the rollers are cylinder rollers with a length of L.
  • stress- strain flaps are fixed, from which information of the inner surface stress state appearing by chosen distribution in roller lengthwise direction can be achieved.
  • stresses are wanted, which in nip contact point represent stresses formed into the roller inner surface. Since roller 2 is rotating the wanted stress values are received by cycles only once per revolution. However, stress values are at their maximum value in nip connect point, so that their peak values are easily distinguished from information by the stress-strain flaps.
  • Figure 2 shows a construction, where into the other roller (roller causing nip pressure) a dead core 6 is placed, to which hydraulically working pushers 7 have been fixed at a distance from each other and which by means pushing shoes 8 push the roller 1 mantle against roller 2.
  • Roller 1 is fastened with bearings to roll on core 6.
  • the calculation model gives, used in another direction, the distribution of line force by nip connection of known rollers, when into the calculation model stress values from counter roller 2 are recorded. By means of the calculation model it is possible to find out as of from the stress values measured from roller 2 the shape of the necessary crowning shape so that the line force would be distributed evenly.
  • Figure 3 shows diagrammatically along roller length L stresses measured by means of strain flaps 3 in the axial direction ⁇ a and the radial direction ⁇ r.
  • the stress values of corresponding points are also determined by means of the calculation model.
  • Figure 4 shows distribution of line force Fn all over the roller. Certain stress values in Figure 3 correspond to each line force value and vice versa, when the same roller pair is observed.
  • Figure 5 shows a crowning shape on roller outer surface.
  • Figure 6 shows diagrammatically the distribution of pushing force Fp.
  • the measuring of stress can be restricted only to the roller centre, whereat, knowing the calculated roller features, from the stress values of the roll centre other stresses active along the roller length can be determined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un procédé qui permet de déterminer l'uniformité de la force de ligne (Fn) s'exerçant sur la zone de contact de pincement de deux rouleaux rotatifs (1, 2) et d'uniformiser le déséquilibre de la charge linéaire. Les variables décrivant la paire de rouleaux sont intégrées dans la formule du modèle de calcul qui comporte la paire de rouleaux correspondants. Le diagramme obtenu permet de résoudre les états de contrainte de la virole recherchés qui représentent la force de ligne uniformément répartie (Fn) ; ceux-ci, tels que calculés par la formule, s'exercent au moins sur l'enveloppe de l'autre rouleau (2) par points, invariablement sur la ligne de contact de pincement. Par ailleurs, ce procédé permet de mesurer, depuis la surface intérieure de l'enveloppe d'au moins l'autre rouleau (2), les contraintes de coquille qui s'exercent sur l'enveloppe, au niveau du point de pincement. La pression de pincement étant uniformisée pour modifier la charge d'au moins l'autre rouleau ou le bombé jusqu'à ce que les contraintes mesurées correspondent suffisamment aux valeurs calculées.
PCT/FI2003/000202 2002-03-18 2003-03-18 Procede de determination d'une force de ligne et de distribution d'une force de ligne constante entre deux rouleaux rotatifs Ceased WO2003078729A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003212398A AU2003212398A1 (en) 2002-03-18 2003-03-18 Method for determining a line force and for distributing constant line force between two rotating rolls
EP03708294A EP1497497A1 (fr) 2002-03-18 2003-03-18 Procede de determination d'une force de ligne et de distribution d'une force de ligne constante entre deux rouleaux rotatifs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20020501 2002-03-18
FI20020501A FI114413B (fi) 2002-03-18 2002-03-18 Menetelmä nippivoiman määrittämiseksi ja nippivoiman tasaamiseksi kahden pyörivän telan välillä

Publications (1)

Publication Number Publication Date
WO2003078729A1 true WO2003078729A1 (fr) 2003-09-25

Family

ID=8563572

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2003/000202 Ceased WO2003078729A1 (fr) 2002-03-18 2003-03-18 Procede de determination d'une force de ligne et de distribution d'une force de ligne constante entre deux rouleaux rotatifs

Country Status (4)

Country Link
EP (1) EP1497497A1 (fr)
AU (1) AU2003212398A1 (fr)
FI (1) FI114413B (fr)
WO (1) WO2003078729A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298057A2 (fr) * 1987-02-23 1989-01-04 Valmet Paper Machinery Inc. Méthode et dispositif de contrôle d'un rouleau à zones
US4903517A (en) * 1987-05-09 1990-02-27 Kleinewefers Gmbh Method of and apparatus for regulating the operation of calenders and like machines
WO1996025288A1 (fr) * 1995-02-16 1996-08-22 Stowe Woodward Licensco, Inc. Systeme pour la detection de la pression dynamique s'exerçant a la ligne de contact entre deux rouleaux
WO1998043755A1 (fr) * 1997-03-27 1998-10-08 Siemens Aktiengesellschaft Procede et dispositif pour preregler la planeite d'un feuillard lamine
WO1999066125A1 (fr) * 1998-06-15 1999-12-23 Valmet Corporation Methode de regulation d'un rouleau reglable par zone
WO2001027390A1 (fr) * 1999-10-13 2001-04-19 Metso Paper, Inc. Procede de calandrage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298057A2 (fr) * 1987-02-23 1989-01-04 Valmet Paper Machinery Inc. Méthode et dispositif de contrôle d'un rouleau à zones
US4903517A (en) * 1987-05-09 1990-02-27 Kleinewefers Gmbh Method of and apparatus for regulating the operation of calenders and like machines
WO1996025288A1 (fr) * 1995-02-16 1996-08-22 Stowe Woodward Licensco, Inc. Systeme pour la detection de la pression dynamique s'exerçant a la ligne de contact entre deux rouleaux
WO1998043755A1 (fr) * 1997-03-27 1998-10-08 Siemens Aktiengesellschaft Procede et dispositif pour preregler la planeite d'un feuillard lamine
WO1999066125A1 (fr) * 1998-06-15 1999-12-23 Valmet Corporation Methode de regulation d'un rouleau reglable par zone
WO2001027390A1 (fr) * 1999-10-13 2001-04-19 Metso Paper, Inc. Procede de calandrage

Also Published As

Publication number Publication date
FI20020501A0 (fi) 2002-03-18
AU2003212398A1 (en) 2003-09-29
FI114413B (fi) 2004-10-15
FI20020501A7 (fi) 2003-09-19
EP1497497A1 (fr) 2005-01-19

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