EP0040568B1 - Dispositif d'amélioration de l'aspect superficiel des tôles laminées et recuites - Google Patents

Dispositif d'amélioration de l'aspect superficiel des tôles laminées et recuites Download PDF

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Publication number
EP0040568B1
EP0040568B1 EP81400773A EP81400773A EP0040568B1 EP 0040568 B1 EP0040568 B1 EP 0040568B1 EP 81400773 A EP81400773 A EP 81400773A EP 81400773 A EP81400773 A EP 81400773A EP 0040568 B1 EP0040568 B1 EP 0040568B1
Authority
EP
European Patent Office
Prior art keywords
metal sheet
cylinder
sheet
cylinders
traction
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
Application number
EP81400773A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0040568A1 (fr
Inventor
Pierre Allée Charles Beaudelaire Delfolie
Bernard Allée Alfred de Musset Francois
Marc Grumbach
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.)
Clecim SAS
Original Assignee
Clesid SA
Clecim SAS
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9242078&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0040568(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Clesid SA, Clecim SAS filed Critical Clesid SA
Priority to AT81400773T priority Critical patent/ATE5301T1/de
Publication of EP0040568A1 publication Critical patent/EP0040568A1/fr
Application granted granted Critical
Publication of EP0040568B1 publication Critical patent/EP0040568B1/fr
Expired legal-status Critical Current

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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 invention is in the field of sheet metal hardening and relates more particularly to obtaining an acceptable surface condition for subsequent treatments such as metal coating, painting, etc.
  • the thin sheets after rolling and annealing are generally curled, blistered, wavy on the edges and the middle part, which is not without drawbacks for subsequent treatments. This is why industrial trains are usually fitted with various devices intended to minimize these defects, such as leveling lines.
  • the object of the invention is precisely to provide sheets whose appearance is acceptable for surface treatments.
  • the subject of the invention is a device essentially composed of one or more cylinders with radii at most equal to approximately 75 times the thickness of the sheet and further comprising means for giving the sheet a winding angle on each cylinder. between 10 ° and 40 ° and means for ensuring a traction between 20% and 80% of the elastic limit of the sheet.
  • their respective diameters are in a ratio between 1.5 and 2.5 and they are preferably arranged in order of increasing diameters in the direction of movement of the sheet.
  • the spacing of their respective axes is at least equal to three times the radius of the cylinder of largest radius.
  • the spacing of the bands is therefore less and at most equal to half the length of plastic contact between the sheet and the cylinder. It is therefore possible to adjust the spacing of the strips by acting on the parameters indicated above and, by making this spacing sufficiently small, to obtain sheets where the vermiculations are practically no longer discernible with the naked eye. This condition is met in particular when the distance between the strips is much less than their width.
  • the length of plastic contact between the sheet and the cylinder and, consequently, the spacing of the strips depends in particular on the radius of the deformed cylinder.
  • the flattening of the latter is evaluated, in this particular case, as in the case of any rolling cylinder, based on the rolling force.
  • the constants A and B are representative of the operating conditions. An approximate value, sufficient to evaluate the value to which I must be less, can be calculated from the expressions:
  • deformation bands 1 obtained by work hardening, using cylinders, on a thin sheet already brought, by rolling, to the desired final thickness. These bands are in the form of dark horizontal lines because they are hollow relative to the surface 2 of the sheet which therefore appears in clear on the photo.
  • the vermiculures 1 are practically equidistant and have a well-defined periodicity. They arise in the grip on the surface of the sheet, parallel to the axis of the cylinders and propagate towards the inside of the sheet.
  • FIGS. 2 and 3 essentially comprise cylinders C (FIG. 1), C 1 , C 2 , C 3 (FIG. 2) which give the sheet T, of thickness e, sufficient work hardening to obtain tight deformation bands.
  • the sheet, supported on these non-driven cylinders, is subjected to a tension greater than 20% of the elastic limit to be deformed superficially.
  • the means provided for exerting tension are not shown in the figures, because, advantageously, the device according to the invention can be inserted into an already existing work hardening line, preferably between the finishing cages and the leveling systems, or before winding, the running speed and the traction then being imposed by the characteristics of the work hardening line.
  • the radius R of the cylinder C and the radii R i , R 2 , R 3 respectively of the cylinders C 1 , C 2 , C 3 are chosen so as to obtain the desired deformation, such that their ratio to the thickness of the sheet is less than 75.
  • angles a, ⁇ 1 , ⁇ 2 , ⁇ 3 formed by the sheet T, and respectively the cylinders C, C 1 , C 2 , C 3 are between 10 ° and 40 °, which, in the case of the device shown in Figure 2, requires that the rollers are not too close together.
  • the spacings D 1 and D 2 are chosen which are at least equal to three times the radius of the largest cylinder, in this case C 3 .
  • a device according to the invention comprising a single cylinder, was introduced.
  • the latter with a diameter of 30 mm, is placed between a tensioning block and the hardening rolling mill.
  • the winding angle of the sheet on this cylinder is approximately 30 ° and the tensile force is between 50 and 100 N / mm 2 , or 25 to 50 N per mm of width.
  • the laminated sheet has a thickness of about 0.5 to 0.6 mm and its width is close to 1000 mm.
  • the constants A and B in the particular case under consideration, a being equal to 0.15 for a steel cylinder, have respectively the value 6 and 0.01, which gives, for the spacing 1 of the deformation bands, a value less than therefore a value less than 0.5 mm. After work hardening, this initial spacing leads to an excellent surface condition.
  • the invention is not limited, in its application to rolling lines comprising leveling systems such as those envisaged, but can be implemented wherever it is necessary to adjust the spacing of the deformation bands, in particular in the case of wound sheets.
  • it is it limited to a narrow category of sheets, but although thin sheets are generally understood to be less than 6 mm thick, they can be used for thicker sheets provided that the means are available. '' apply the necessary deformation.
  • the number of cylinders constituting the implementation device is not limited, but it will be advantageous, in each particular case, to use the minimum number to obtain the desired work hardening. For thin sheets, a single cylinder is generally sufficient.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Laminated Bodies (AREA)
EP81400773A 1980-05-16 1981-05-15 Dispositif d'amélioration de l'aspect superficiel des tôles laminées et recuites Expired EP0040568B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400773T ATE5301T1 (de) 1980-05-16 1981-05-15 Vorrichtung zum verbessern des oberflaechenaspektes gewalzter und gegluehter bleche.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8011075A FR2482482B1 (fi) 1980-05-16 1980-05-16
FR8011075 1980-05-16

Publications (2)

Publication Number Publication Date
EP0040568A1 EP0040568A1 (fr) 1981-11-25
EP0040568B1 true EP0040568B1 (fr) 1983-11-16

Family

ID=9242078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400773A Expired EP0040568B1 (fr) 1980-05-16 1981-05-15 Dispositif d'amélioration de l'aspect superficiel des tôles laminées et recuites

Country Status (4)

Country Link
EP (1) EP0040568B1 (fi)
AT (1) ATE5301T1 (fi)
DE (1) DE3161416D1 (fi)
FR (1) FR2482482B1 (fi)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530264B1 (fr) * 1982-07-19 1989-12-29 Inst Francais Du Petrole Procede permettant d'accroitre la resistance a la corrosion fissurante d'elements allonges tels que des armatures de conduites flexibles ou de cables, et produits ainsi obtenus
FR2586595B1 (fr) * 1985-09-05 1989-08-18 Maubeuge Fer Dispositif de planage d'une bande metallique sous traction.
IT1271710B (it) * 1994-11-08 1997-06-04 Selema Srl Gruppo di spianatura per drizzatrici,sotto tensione,per nastri metallici,con rulli di lavoro a diametro crescente

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260093A (en) * 1964-04-01 1966-07-12 Natalis H Polakowski Strip flattening device
BE668383A (fi) * 1964-08-17
JPS5148455B2 (fi) * 1973-04-24 1976-12-21
DE2734500A1 (de) * 1977-07-30 1979-02-15 Bwg Bergwerk Walzwerk Verfahren zur herstellung von elektroblechen und -baendern, insbesondere von fe-si-blechen und -baendern
DE2750752B2 (de) * 1977-11-12 1980-08-28 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg Verfahren und Vorrichtung zum Richten und zur Verbesserung der Qualitatseigenschaften von Metallbändern, insbesondere Elektrobändern

Also Published As

Publication number Publication date
EP0040568A1 (fr) 1981-11-25
ATE5301T1 (de) 1983-12-15
FR2482482B1 (fi) 1984-08-24
FR2482482A1 (fi) 1981-11-20
DE3161416D1 (en) 1983-12-22

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