EP0040568A1 - Vorrichtung zum Verbessern des Oberflächenaspektes gewalzter und geglühter Bleche - Google Patents

Vorrichtung zum Verbessern des Oberflächenaspektes gewalzter und geglühter Bleche Download PDF

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Publication number
EP0040568A1
EP0040568A1 EP81400773A EP81400773A EP0040568A1 EP 0040568 A1 EP0040568 A1 EP 0040568A1 EP 81400773 A EP81400773 A EP 81400773A EP 81400773 A EP81400773 A EP 81400773A EP 0040568 A1 EP0040568 A1 EP 0040568A1
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EP
European Patent Office
Prior art keywords
sheet
cylinder
spacing
cylinders
expressed
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.)
Granted
Application number
EP81400773A
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English (en)
French (fr)
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EP0040568B1 (de
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
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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/de
Application granted granted Critical
Publication of EP0040568B1 publication Critical patent/EP0040568B1/de
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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 relates to the field of work hardening of thin sheets and relates more particularly to obtaining an acceptable surface condition for subsequent treatments such as metallic 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 provided with devices / miscellaneous 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 method of improving the surface appearance of thin rolled and annealed sheets, according to which the spacing of the deformation bands, obtained by work hardening, is adjusted so that this spacing is less about twice the width of the bands. During this work hardening, the overall rate of deformation remains below 4%.
  • the invention also relates to an implementation device, consisting essentially 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 an angle d winding on each cylinder between 10 ° and 40 ° and means for ensuring a traction between 20% and 80% of the elastic limit of the sheet.
  • the device comprises several cylinders
  • 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 very 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, from the rolling force. We therefore arrive, after simplification, at the expression which the spacing 1 of the bands must verify to obtain the desired result:
  • 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.
  • the two variant embodiments of the device according to the invention essentially comprise cylinders C (FIG. 1), C 1 , C 2 , C 3 (FIG. 2) which give the sheet metal T, of thickness e, sufficient hardening to obtain strips of tight deformation.
  • 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 cages / finishers 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 1 , 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 ⁇ , ⁇ 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 differences emen t s D 1 and D2 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, has been 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 / mm2, 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 they have the means to '' 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)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Laminated Bodies (AREA)
EP81400773A 1980-05-16 1981-05-15 Vorrichtung zum Verbessern des Oberflächenaspektes gewalzter und geglühter Bleche Expired EP0040568B1 (de)

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 (de) 1980-05-16 1980-05-16
FR8011075 1980-05-16

Publications (2)

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

Family

ID=9242078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400773A Expired EP0040568B1 (de) 1980-05-16 1981-05-15 Vorrichtung zum Verbessern des Oberflächenaspektes gewalzter und geglühter Bleche

Country Status (4)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325168A1 (de) * 1982-07-19 1984-01-19 Institut Français du Pétrole, 92502 Rueil-Malmaison, Hauts-de-Seine Verfahren zum steigern der bestaendigkeit gegen spannungsrisskorrosion laenglicher elemente sowie auf diese weise hergestelltes laengliches element
FR2586595A1 (fr) * 1985-09-05 1987-03-06 Maubeuge Fer Dispositif de planage d'une bande metallique sous traction.
WO1996014175A1 (en) * 1994-11-08 1996-05-17 Selema S.R.L. Flattening group in levelling machines kept under tension, for metal bands, with operative rollers of increasing diameter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU48306A1 (de) * 1964-04-01 1965-06-01
FR1456685A (fr) * 1964-08-17 1966-07-08 Machine à dresser et à rouler les bandes de métal
US3834202A (en) * 1973-04-24 1974-09-10 Toyo Kohan Co Ltd Metal strip straightening machine
FR2398805A1 (fr) * 1977-07-30 1979-02-23 Bwg Bergwerk Walzwerk Procede pour la fabrication de toles electriques et analogues, en particulier celles a base de fer et de silicium, et dispositif pour sa mise en oeuvre
FR2408658A1 (fr) * 1977-11-12 1979-06-08 Bwg Bergwerk Walzwerk Procede et dispositif pour ameliorer les proprietes de toles metalliques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU48306A1 (de) * 1964-04-01 1965-06-01
FR1456685A (fr) * 1964-08-17 1966-07-08 Machine à dresser et à rouler les bandes de métal
US3834202A (en) * 1973-04-24 1974-09-10 Toyo Kohan Co Ltd Metal strip straightening machine
FR2398805A1 (fr) * 1977-07-30 1979-02-23 Bwg Bergwerk Walzwerk Procede pour la fabrication de toles electriques et analogues, en particulier celles a base de fer et de silicium, et dispositif pour sa mise en oeuvre
FR2408658A1 (fr) * 1977-11-12 1979-06-08 Bwg Bergwerk Walzwerk Procede et dispositif pour ameliorer les proprietes de toles metalliques

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325168A1 (de) * 1982-07-19 1984-01-19 Institut Français du Pétrole, 92502 Rueil-Malmaison, Hauts-de-Seine Verfahren zum steigern der bestaendigkeit gegen spannungsrisskorrosion laenglicher elemente sowie auf diese weise hergestelltes laengliches element
US4489137A (en) * 1982-07-19 1984-12-18 Institut Francais Du Petrole Process for increasing the resistance to cracking corrosion of elongate elements such as armorings of flexible pipes or cables and the resultant products
FR2586595A1 (fr) * 1985-09-05 1987-03-06 Maubeuge Fer Dispositif de planage d'une bande metallique sous traction.
EP0225198A1 (de) * 1985-09-05 1987-06-10 Fabrique De Fer De Maubeuge Vorrichtung zum Streckrichten eines metallischen Bandes
US4823582A (en) * 1985-09-05 1989-04-25 Fabrique De Fer De Maubeuge Device for planing a sheet metal strip under tension
WO1996014175A1 (en) * 1994-11-08 1996-05-17 Selema S.R.L. Flattening group in levelling machines kept under tension, for metal bands, with operative rollers of increasing diameter

Also Published As

Publication number Publication date
ATE5301T1 (de) 1983-12-15
FR2482482B1 (de) 1984-08-24
DE3161416D1 (en) 1983-12-22
EP0040568B1 (de) 1983-11-16
FR2482482A1 (de) 1981-11-20

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