EP0471777B1 - Procede pour dressage de feuillards minces par etirage et cintrage - Google Patents

Procede pour dressage de feuillards minces par etirage et cintrage Download PDF

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Publication number
EP0471777B1
EP0471777B1 EP90908320A EP90908320A EP0471777B1 EP 0471777 B1 EP0471777 B1 EP 0471777B1 EP 90908320 A EP90908320 A EP 90908320A EP 90908320 A EP90908320 A EP 90908320A EP 0471777 B1 EP0471777 B1 EP 0471777B1
Authority
EP
European Patent Office
Prior art keywords
levelling
line
strip
abscissa
rolls
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.)
Expired - Lifetime
Application number
EP90908320A
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German (de)
English (en)
Other versions
EP0471777A1 (fr
Inventor
Lars Ingvar Ingvarsson
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.)
Coil Processing Systems CPS Teknik AB
Original Assignee
Coil Processing Systems CPS Teknik AB
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
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Publication of EP0471777A1 publication Critical patent/EP0471777A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling

Definitions

  • the present invention concerns a method for levelling strips, the thickness of which is maximum 4 mm, by simultaneous stretching and bending and by help of two levelling rolls only.
  • the strip 2 is subjected to a stretching in order to move the elastic zone from the centre of the strip at the bending around the levelling rolls 1.
  • the main principle for the levelling of the strip 2 is to bring the material to exceed the yield point 8 S across the whole of its cross section in such a way that partly eventual buckles and others are removed, partly the strip leaving the last levelling roll without being bent.
  • the strip is passing the levelling device, fig 1, under a pull effected by a tractive force of the coiling reel 3 and the braking force of the decoiling reel 4.
  • Breaking rolls 5 are arranged on both sides of the levelling roll assembly to compensate changes in the pulling force in the strip 2 at changing outer diameters of the coils at coiling and decoiling. To get a good result a constant pull is required in the strip 2.
  • the stretching force in the strip usually is adjusted in that way that a specific pulling force of 20-40 % of the yield point is reached in the strip.
  • the diameter of the levelling rolls usually is dimensioned according to the unlevelty of the strip before levelling and the thickness of the strip.
  • roller diameter is about 100 times the thickness t of the strip, but can of course vary within wide limits.
  • a varying roller diameter in the assembly of levelling rolls also can be found.
  • the drawbacks of conventional roller levelling assemblies is among others that these, because of a great number of levelling rolls, are complicated to adjust to get level strips and rather expensive in manufacturing. Also the plastic area of the strip is utilised into a too high degree because of a great number of bendings, which reduces the area of finishing of the material before reaching the breaking point and also hardens considerably because of the cold working.
  • a radius R1 of the first levelling roll 1 is choosen, which because of earlier experiances from roller levelling devices shall be around or somewhat below 50 times the thickness t of the strip 2.
  • a distance a is pointed out from the origin of coordinates along the abscissa, which distance is equal to the thickness t of the strip divided by the radius R1 of the first roll, and from that point a first parallel line 10 is drawn up against the plasticity line 9, parallel to the elasticity line 7.
  • a first surface 11 is constituted in the diagram, fig 2, between the abscissa, the elasticity line 7, the first parallel line 10 and the plasticity line 9.
  • a new second parallel line 12 is drawn to the right of the first surface 11 in that way that a second surface 13 between the abscissa, the first and the second parallel line 10, 12 and the plastcity line 9 becomes equal to the first surface 11.
  • the distance b along the abscissa between the first and the second parallel line 10, 12 is measured.
  • the thickness t of the strip 2 is devided with the later distance b which constitutes the radius R2 of the second levelling roll 1 in the roller levelling device, fig 1.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Stringed Musical Instruments (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Decoration Of Textiles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Luminescent Compositions (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (2)

1. Procédé pour le dressage d'un feuillard mince (2) par étirement et cintrage dans un dispositif de dressage à rouleaux (figure 1) constitué par une bobine d'enroulement freinée (4), un dispositif de contrôle des contraintes (5), des rouleaux fous (1) ainsi qu'une bobine d'enroulement entraînée (3), caractérisé en ce que seulement deux rouleaux de dressage (1) sont utilisés et que la relation entre leurs rayons, R1 et R2, est déterminée en effectuant un test d'élasticité en accord avec la spécification générale en Suède SS 11 21 10 sur les matériaux en bande ou feuillard (2), un diagramme d'élongation et contraintes (figure 2) étant dessiné avec une élongation ou alongement s en abscisse et la contrainte 0 en ordonnée, constituée par une ligne élastique (7) commençant par l'origine des coordonnées, suivie par une ligne de plasticité (9), une distance a étant définie depuis l'origine des coordonnées le long de l'abscisse, qui est égale à l'épaisseur t du feuillard (2) divisée par le rayon R1 du premier rouleau (1), ainsi qu'une première ligne parallèle (10) qui est dessinée parallèlement à la ligne d'élasticité (7) jusqu'à la ligne de plasticité (9), en ce qu'une seconde ligne parallèle (12) est dessinée de manière correspondante sur une distance b le long de l'abscisse depuis la première ligne parallèle (10) de sorte que les deux surfaces (11, 13) définies entre l'abscisse et la ligne de plasticité (9) soient égales et que le rayon R2 du second rouleau de dressage soit déterminé en accord avec la formule suivante :
Figure imgb0003
EP90908320A 1989-05-11 1990-05-09 Procede pour dressage de feuillards minces par etirage et cintrage Expired - Lifetime EP0471777B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8901686 1989-05-11
SE8901686A SE463605B (sv) 1989-05-11 1989-05-11 Saett att planrikta tunna plaatband medelst straeckning och boejning

Publications (2)

Publication Number Publication Date
EP0471777A1 EP0471777A1 (fr) 1992-02-26
EP0471777B1 true EP0471777B1 (fr) 1993-09-08

Family

ID=20375919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90908320A Expired - Lifetime EP0471777B1 (fr) 1989-05-11 1990-05-09 Procede pour dressage de feuillards minces par etirage et cintrage

Country Status (8)

Country Link
EP (1) EP0471777B1 (fr)
AT (1) ATE94094T1 (fr)
DE (1) DE69003242T2 (fr)
DK (1) DK0471777T3 (fr)
FI (1) FI915311A0 (fr)
NO (1) NO176046C (fr)
SE (1) SE463605B (fr)
WO (1) WO1990013372A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3590288B2 (ja) * 1999-02-15 2004-11-17 住友重機械工業株式会社 帯板のレベリング方法およびレベリング装置
EP1602918B1 (fr) 2003-03-07 2016-01-20 Shikoku Research Institute Incorporated Procede et systeme de surveillance de fuites de gaz

Also Published As

Publication number Publication date
SE8901686D0 (sv) 1989-05-11
NO914335D0 (no) 1991-11-05
SE463605B (sv) 1990-12-17
DE69003242D1 (de) 1993-10-14
SE8901686L (sv) 1990-11-12
DE69003242T2 (de) 1994-01-27
WO1990013372A1 (fr) 1990-11-15
ATE94094T1 (de) 1993-09-15
DK0471777T3 (da) 1994-03-14
EP0471777A1 (fr) 1992-02-26
FI915311A0 (fi) 1991-11-11
NO176046C (no) 1995-01-25
NO176046B (no) 1994-10-17
NO914335L (no) 1991-11-05

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