EP0471777B1 - Verfahren zum richten von bändern durch strecken und biegen - Google Patents

Verfahren zum richten von bändern durch strecken und biegen 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
Other languages
English (en)
French (fr)
Other versions
EP0471777A1 (de
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
Application filed by Coil Processing Systems CPS Teknik AB filed Critical Coil Processing Systems CPS Teknik AB
Publication of EP0471777A1 publication Critical patent/EP0471777A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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.

Claims (2)

1. Verfahren zum Richten eines dünnen Bandes (2) durch einen Streck- und einen Biegevorgang in einer Rollen-Richtvorrichtung (Fig. 1), die durch eine gebremste Abwickelrolle (2), eine Belastungs-Steuervorrichtung (5), nicht-angetriebene Rollen (1) und eine angetriebene Aufwickelrolle (3) gebildet wird, dadurch
gekennzeichnet,
daß nur zwei Richtrollen (1) benutzt werden und daß die Beziehung zwischen deren Radien, R1 und R2, durch das Durchführen eines Zugversuchs gemäß der schwedischen General-Beschreibung SS 11 21 10 am Material des Bandes (2) durchgeführt wird, daß ein Belastungs-Dehnungsdiagramm (Fig. 2) aufgezeichnet wird, mit der Dehnung als Abszisse und der Belastung a als Ordinate, die durch eine Elastizitätslinie (7) gebildet wird, die vom Nullpunkt der Koordinaten ausgeht und die in eine Plastizitätslinie (9) übergeht,
daß ein Abstand a vom Nullpunkt der Koordinaten längs der Abszisse eingezeichnet wird, der gleich der Dicke t des Bandes (2), geteilt durch den Radius R1 der ersten Rolle (1) ist, und daß eine erste, parallele Linie (10) parallel zur Elastizitätslinie (7) bis zur Elastizitätslinie (9) gezeichnet wird, daß eine zweite, parallele Linie (12) in entsprechender Weise in einem Abstand b längs der Abszisse von der ersten, parallelen Linie so gezogen wird, daß die beiden Flächen (11, 13), die zwischen der Abszisse und der Plastizitätslinie gebildet werden, einander gleich sind, wobei der Radius R2 der zweiten Richtrolle nach der Formel
Figure imgb0002
bestimmt wird.
EP90908320A 1989-05-11 1990-05-09 Verfahren zum richten von bändern durch strecken und biegen Expired - Lifetime EP0471777B1 (de)

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 (de) 1992-02-26
EP0471777B1 true EP0471777B1 (de) 1993-09-08

Family

ID=20375919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90908320A Expired - Lifetime EP0471777B1 (de) 1989-05-11 1990-05-09 Verfahren zum richten von bändern durch strecken und biegen

Country Status (8)

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

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
CA2518491C (en) 2003-03-07 2011-11-08 Shikoku Research Institute Incorporated Gas leakage monitoring method and its system

Also Published As

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

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