EP0471777B1 - Method for levelling thin strips by stretching and bending - Google Patents
Method for levelling thin strips by stretching and bending Download PDFInfo
- 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
Links
- 238000005452 bending Methods 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title claims abstract description 4
- 238000010586 diagram Methods 0.000 claims description 4
- 238000009864 tensile test Methods 0.000 claims description 4
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Images
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)
- Stringed Musical Instruments (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Treatment Of Fiber Materials (AREA)
- Luminescent Compositions (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Decoration Of Textiles (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
- 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.
- Known levelling devices, fig 1, for levelling strips with a small thickness and widths, which can be considerable, is constituted in its central part of a number of zigzag-placed rolls 1 between which the strip 2 is passing and where the surface of the strip 2 is bended in two opposite directions. On the same time 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 8S 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. Thus the strip is passing the levelling device, fig 1, under a pull effected by a tractive force of thecoiling reel 3 and the braking force of the decoilingreel 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. Normally the 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. - Surprisingly it has been found that strips can be levelled by only two levelling rolls if, beside: of an appropiate pull in the strip and an appropiate dimension of the diameter of the breaking rolls, the mutual relation between the roller diameters is adjusted. The invention will be described in the claim enclosed, in the closer description below and by help of the enclosed drawings on which figure 1 schematically shows an ordinary straightening machine and figure 2 a tensile test diagram of the actual strip material.
- Initially pieces for tensile test are taken from the strip 2, which is to be levelled, tensile test is made and a diagram for stress and elongation is drawn up in a conventional way with the elongation s as abscissa and the stress a as ordinate, fig 2, (see the Swedish general specification SS 11 21 10). A mainly straight upward slooping line extends from the origin of the coordinates, the
elasticity line 7, up to theyield point 8, which after that turns into a more level line, theplasticity line 9. Thelater line 9 whithout disadvantages can be approximated by a straight line. 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 firstparallel line 10 is drawn up against theplasticity line 9, parallel to theelasticity line 7. By that afirst surface 11 is constituted in the diagram, fig 2, between the abscissa, theelasticity line 7, the firstparallel line 10 and theplasticity line 9. A new secondparallel line 12 is drawn to the right of thefirst surface 11 in that way that asecond surface 13 between the abscissa, the first and the secondparallel line plastcity line 9 becomes equal to thefirst surface 11. The distance b along the abscissa between the first and the secondparallel line
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8901686A SE463605B (en) | 1989-05-11 | 1989-05-11 | SETTING TO PLANGE THINNY SHEET TAPES MEDIUM STRAIGHT AND BENDING |
SE8901686 | 1989-05-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0471777A1 EP0471777A1 (en) | 1992-02-26 |
EP0471777B1 true EP0471777B1 (en) | 1993-09-08 |
Family
ID=20375919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90908320A Expired - Lifetime EP0471777B1 (en) | 1989-05-11 | 1990-05-09 | Method for levelling thin strips by stretching and bending |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0471777B1 (en) |
AT (1) | ATE94094T1 (en) |
DE (1) | DE69003242T2 (en) |
DK (1) | DK0471777T3 (en) |
FI (1) | FI915311A0 (en) |
NO (1) | NO176046C (en) |
SE (1) | SE463605B (en) |
WO (1) | WO1990013372A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3590288B2 (en) * | 1999-02-15 | 2004-11-17 | 住友重機械工業株式会社 | Strip plate leveling method and leveling device |
EP2511611A1 (en) | 2003-03-07 | 2012-10-17 | Shikoku Research Institute Incorporated | Hydrogen flame monitoring method and system |
-
1989
- 1989-05-11 SE SE8901686A patent/SE463605B/en unknown
-
1990
- 1990-05-09 WO PCT/SE1990/000311 patent/WO1990013372A1/en active IP Right Grant
- 1990-05-09 DE DE90908320T patent/DE69003242T2/en not_active Expired - Fee Related
- 1990-05-09 DK DK90908320.6T patent/DK0471777T3/en active
- 1990-05-09 AT AT90908320T patent/ATE94094T1/en not_active IP Right Cessation
- 1990-05-09 EP EP90908320A patent/EP0471777B1/en not_active Expired - Lifetime
-
1991
- 1991-11-05 NO NO914335A patent/NO176046C/en not_active IP Right Cessation
- 1991-11-11 FI FI915311A patent/FI915311A0/en unknown
Also Published As
Publication number | Publication date |
---|---|
ATE94094T1 (en) | 1993-09-15 |
SE8901686D0 (en) | 1989-05-11 |
NO914335D0 (en) | 1991-11-05 |
NO176046B (en) | 1994-10-17 |
DE69003242T2 (en) | 1994-01-27 |
NO176046C (en) | 1995-01-25 |
SE8901686L (en) | 1990-11-12 |
DK0471777T3 (en) | 1994-03-14 |
WO1990013372A1 (en) | 1990-11-15 |
SE463605B (en) | 1990-12-17 |
DE69003242D1 (en) | 1993-10-14 |
FI915311A0 (en) | 1991-11-11 |
NO914335L (en) | 1991-11-05 |
EP0471777A1 (en) | 1992-02-26 |
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