EP1362653A1 - Verfahren und Vorrichtung zur Herstellung von Metallbändern, Verfahren zur Herstellung der Vorrichtung, und Metallband und Artikel mit einem solchen Metallband - Google Patents

Verfahren und Vorrichtung zur Herstellung von Metallbändern, Verfahren zur Herstellung der Vorrichtung, und Metallband und Artikel mit einem solchen Metallband Download PDF

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Publication number
EP1362653A1
EP1362653A1 EP02076960A EP02076960A EP1362653A1 EP 1362653 A1 EP1362653 A1 EP 1362653A1 EP 02076960 A EP02076960 A EP 02076960A EP 02076960 A EP02076960 A EP 02076960A EP 1362653 A1 EP1362653 A1 EP 1362653A1
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EP
European Patent Office
Prior art keywords
work roll
metal strip
uniform
area
surface finish
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.)
Withdrawn
Application number
EP02076960A
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English (en)
French (fr)
Inventor
designation of the inventor has not yet been filed The
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.)
Corus UK Ltd
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Corus UK Ltd
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 Corus UK Ltd filed Critical Corus UK Ltd
Priority to EP02076960A priority Critical patent/EP1362653A1/de
Publication of EP1362653A1 publication Critical patent/EP1362653A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B21H8/005—Embossing sheets or rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/005—Rolls with a roughened or textured surface; Methods for making same

Definitions

  • the invention relates to means and a method for producing a metal strip.
  • the production of a metal strip normally comprises mechanical rolling, whereby the metal strip is rolled between a pair of work rolls.
  • a work roll is normally incorporated in a roll stand, optionally supported by one or more back-up rolls.
  • a mechanical interaction is brought about between the working surface of the work roll and the metal strip for deforming the metal strip.
  • Rolling of metal strip normally occurs in a rolling mill comprising one rolling stand or a sequence of rolling stands.
  • the last rolling operation in such sequence is known as temper rolling, skin pass rolling or double reduction rolling.
  • the reason for this last rolling step is usually to strengthen the steel strip and to impart the required surface finish.
  • the working surface of a work roll is normally provided with a uniform surface finish having a surface roughness and texture-peak density of certain values, depending on the desired type of surface finish that is intended to be given to the metal strip under production.
  • Typical surface finishes for the work roll's working surface include: Finish type Roughness value Ra ( ⁇ m) Bright max. 0.10 Super Bright max. 0.08 Matte A 1.35 - 1.55 Silver Glow 3.20 - 3.60 Stone 0.40 - 0.60 Fine Stone 0.20 - 0.40
  • a method for producing a metal strip comprising rolling the metal strip with at least one work roll having an essentially circular cylindrical working surface, that, in an area having a uniform curvature, has been provided with a non-uniform surface finish.
  • the non-uniform surface finish of the work roll is herewith transferred to a corresponding imprint in the metal sheet concerned.
  • the resulting surface finish of the metal strip that has been rolled this way has a deliberate non-uniform appearance of the metal strip surface instead of the normally applied uniform one.
  • the resulting metal strip therefore has a customised appearance.
  • the non-uniform appearance of the metal strip surface enables the definition of a deliberate pattern on the surface of the metal strip for decorating it. Images can for instance be rolled onto the metal strip by making use of apparent contrasts in various types of surface finishes.
  • the method is very effective in producing large amounts of customised metal strip, because the desired pattern is applied only once to a intermediate surface, being the working surface of the work roll, and then transferred to the metal strip multiple times using the same work roll.
  • a very large surface area of customised metal strip can be produced by merely providing a corresponding customised surface finish to the relatively small area of the working surface of the work roll.
  • the thickness gauge of the metal strip may be reduced by mechanical working of the metal strip.
  • the method according to the invention comprises a subsequent step of providing it with a coating layer, such as a metallic tin or chromium layer, and/or an organic or polymeric coating layer.
  • a coating layer such as a metallic tin or chromium layer, and/or an organic or polymeric coating layer.
  • the non-uniform surface roughness is found to be visible even after providing such a coating layer.
  • the invention involves at least one special technical feature that is present in each of the following aspects of the invention, which are a work roll, a method for producing the work roll, an apparatus incorporating the work roll, a metal strip product and metal article including the metal strip product.
  • the work roll according to the second aspect of the invention comprises an essentially circular cylindrical working surface which, in an area having a uniform curvature, is provided with a non-uniform surface finish.
  • An advantage of this work roll is that it allows for combining known modification of the physical properties of the metal strip, with customising and/or decorating the metal strip. Thus, a separate decorating step is not necessary.
  • embossing is a process wherein a raised image is introduced into the metal strip as a relief, by passing the metal strip though a pair of work rolls comprising at least one embossing work roll.
  • the image is provided in an essentially flat part of the metal strip, through contrast in reflectivity as opposed to relief, at least in part caused by surface roughness characteristics of different areas of the metal strip surface.
  • the non-uniform surface finish forms a desired image for imprinting onto the metal strip when rolled by the work roll.
  • Typical possible images comprise a brand-name or a logo, or an abstract image.
  • the non-uniform surface finish forms a random pattern.
  • a metal strip that is rolled using such a work roll is herewith provided with a corresponding random pattern, which renders such a metal strip particularly useful for subjecting to later forming operations.
  • the random pattern can comprise larger relatively rough areas on a relatively bright background, whereby the larger relatively rough areas can be surrounded by a number of smaller rough areas.
  • an appealing decoration is achieved reminiscent of tiger-stripe print.
  • the surface finish may be non-uniform in any parameter leading to a visual effect, including roughness, reflectivity or gloss.
  • Non-uniformity may be introduced in terms of roughness-peak density, roughness-peak shape, average roughness, width of a distribution of roughness values, or the like.
  • Specular gloss can be expressed in terms of gloss units in accordance with ISO 2813.
  • the non-uniform surface finish comprises a non-uniform surface roughness having a lower Ra value in one part of the area having the uniform curvature and an upper Ra value in anther part of that area.
  • the difference between the upper Ra value and the lower Ra value is preferably at least 0.1 ⁇ m Ra (determined in accordance with DIN 4768), for obtaining sufficient contrast to imprint an observable image in the metal strip. Best results have been obtained using a difference between the upper Ra value and the lower Ra value of at least 0.2 ⁇ m Ra. A difference of 0.4 ⁇ m Ra and higher results in a very pronounced image clarity, even when the lower Ra surface roughness is relatively high.
  • the lower Ra value is less than 0.2 ⁇ m in accordance with DIN 4768.
  • DIN 4768 a very good visibility of the imprinted features is possible.
  • a specular gloss of the working surface having the non-uniform surface finish as measured in terms of gloss units in accordance with ISO 2813, has a lower gloss unit value in one part of the area having the uniform curvature and an gloss upper value in another part of that area.
  • the specular gloss also reflects other characteristics of the surface finish such as roughness-peak density and shape. Irrespective of the surface roughness Ra value, images or a desired patterns can be defined satisfactory if the gloss unit value varies across the working surface.
  • the difference between the upper gloss unit value and the lower gloss unit value is at least 40 units. This provides sufficient contrast to imprint a conveniently observable image in the metal strip. More preferably, the difference is at least 80 units, so that the image is more easily discernable, even when in absolute reflectivity the surface reflectivity is relatively high such as is the case for bright or super bright finishes.
  • the lower gloss unit value is preferably less than 80 units, in order to achieve a very good observability of the imprinted features.
  • the working surface is chrome coated to increase the roll life and transfer effectiveness of the surface finish during rolling.
  • the invention is embodied in a method of producing a work roll, wherein a work roll having an essentially circular cylindrical working surface is subjected to a step of modifying its surface finish wherein the working surface is locally modified in an area having a uniform curvature, to obtain a non-uniform surface finish in that area.
  • EDT can produce higher roughness-peak densities than shot blasting for the same roll roughness.
  • these techniques can be used in combination with a template mask for shielding areas of the working surface from being treated.
  • an embodiment of the invention whereby in one part of the area having the uniform curvature is covered while locally modifying the surface finish in a second part of the area which is kept uncovered. Covering of an area can be achieved by using a template mask. This way, a relatively abrupt transition can be achieved in surface roughness values of adjacent areas. Consequently, highly defined images can be introduced onto the work roll working surface, and in a later instance onto the metal sheet.
  • the template mask may be formed of any suitable material. Good results have been achieved with a rubberised polymer, which is also used for decorating polished stone monuments. For masking local isolated areas, a sticky template mask is preferred.
  • the non-uniform surface roughness is obtained by subjecting the work roll to an electric discharge texturing (EDT) operation
  • EDT electric discharge texturing
  • the EDT operation is performed during a period of time that is shorter than that is needed for producing a uniform surface roughness.
  • an EDT treatment is continued until a uniform surface roughness is achieved over the entire working surface.
  • EDT electric discharge texturing
  • the resulting random pattern is reminiscent of a tiger print.
  • Either of these can be combined by performing the EDT operation with increased spacing between adjacent active electrodes.
  • the invention relates to an apparatus for rolling a metal strip, the apparatus comprising a final roll stand for rolling the metal strip, whereby the final roll stand is provided with at least one work roll according to any embodiment of the invention in its first aspect.
  • the desired surface finish is best controlled.
  • the final roll stand is preceded by one or more intermediate roll stands.
  • the invention relates to a metal strip product, comprising an essentially flat surface.
  • the surface is provided with a non-uniform surface finish.
  • a product is achieved that distinguishes over normally available metal strip products and has added value over normally available metal strip products, in that it is provided with a desired decorated surface.
  • the non-uniform surface roughness can form a deliberate pattern on the surface of the metal strip for decorating, including preferably a desired image that can be defined by virtue of the apparent contrasts in various types of finishes.
  • Typical possible images comprise a brand-name or a logo.
  • the invention relates to a metal article formed out of the metal strip product concerned comprising at least a part of the essentially flat area that is provided with the non-uniform surface finish.
  • Possible metal articles that can advantageously comprise at least a part of the essentially flat area that is provided with the non-uniform surface finish include furniture, wall hangings, lamp shade, picture frame, flooring element, ceiling element, white goods paneling, box.
  • the article can be a metal container, such as a beverage or food container, or a component thereof.
  • the metal container, or component thereof, may be formed in a number of ways, such as drawing and forming, drawing and redrawing, pressing, and forming, bending, welding.
  • FIG. 1a shows a schematic view of a work roll 1, of which its working surface is enveloped with a template mask 2.
  • the template mask 2 is made of a rubberised polymer sheet material, that is provided with openings 13 for defining areas in which the working surface of the work roll to be treated to locally modify its surface finish.
  • FIG. 1b shows a similar work roll 1, of which the working surface is locally covered with pieces of sticky template mask material 3.
  • the work roll By subjecting the work roll to, for instance, a shot blasting operation, the surface roughness of the uncovered areas of the working surface will be increased. After such operation, the template masks are to be removed from the work roll, and the work roll can be applied in, for instance, a temper roll stand.
  • the surface roughness of the untreated work roll can be max. 0.10 ⁇ m Ra which is locally increased by 0.4 ⁇ m Ra by shot blasting.
  • the surface may also be smoothed, for instance by a polishing operation, to achieve a reversed effect.
  • Typical surface finishes on the working surface of the work roll that may be employed include: Finish type Roughness value Ra ( ⁇ m) Bright max. 0.10 Super Bright max. 0.08 Matte A 1.35 - 1.55 Silver Glow 3.20 - 3.60 Stone 0.40 - 0.60 Fine Stone 0.20 - 0.40
  • FIG. 2 shows schematic views of various possible metal strips that can be produced using the work roll with the non-uniform surface finish.
  • FIG. 2a shows a steel strip 4, provided with stripes 6 in the rolling direction having a higher roughness than the remaining portions 5 of the strip.
  • This strip is produced by temper rolling with at least one work roll having been provided with annular bands of increased surface roughness.
  • Such a work roll can be produced without the need of using a template mask, by roll grinding with mutually spaced grinding on ground or shot blast rolls. This can be achieved by modification of existing grinding wheel face widths.
  • FIG. 2b shows a steel strip 7 provided with a logo 9 having a higher surface roughness than that of the remainder 8 of the strip.
  • the pattern repeats itself over a period that corresponds to one revolution of the work roll.
  • the logo can also be defined by providing a background having a higher surface roughness than the areas 9 corresponding to the logo.
  • FIG. 2c shows a steel strip 10 provided with a tiger print formed of random areas 12, elongate in the rolling direction, on a polished background 11.
  • a strip is obtained by rolling it with an EDT treated work roll.
  • EDT electric discharge texturing
  • Metal strips as shown in FIG. 2 can be in the form of black plate, but the impressed images are also visible when the surface is coated with a metallic layer such as chromium or tin, or organic coated or polymer coated.
  • Aesthetically appealing products in particular metal containers, are formed from the metal strip such that the images are displayed on for instance a side wall of the container.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP02076960A 2002-05-17 2002-05-17 Verfahren und Vorrichtung zur Herstellung von Metallbändern, Verfahren zur Herstellung der Vorrichtung, und Metallband und Artikel mit einem solchen Metallband Withdrawn EP1362653A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02076960A EP1362653A1 (de) 2002-05-17 2002-05-17 Verfahren und Vorrichtung zur Herstellung von Metallbändern, Verfahren zur Herstellung der Vorrichtung, und Metallband und Artikel mit einem solchen Metallband

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02076960A EP1362653A1 (de) 2002-05-17 2002-05-17 Verfahren und Vorrichtung zur Herstellung von Metallbändern, Verfahren zur Herstellung der Vorrichtung, und Metallband und Artikel mit einem solchen Metallband

Publications (1)

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EP1362653A1 true EP1362653A1 (de) 2003-11-19

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EP02076960A Withdrawn EP1362653A1 (de) 2002-05-17 2002-05-17 Verfahren und Vorrichtung zur Herstellung von Metallbändern, Verfahren zur Herstellung der Vorrichtung, und Metallband und Artikel mit einem solchen Metallband

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1767405A1 (de) * 2005-09-23 2007-03-28 Plastal S.p.A. Verfahren zur Herstellung ästhetischer Fertigteile für Kraftfahrzeuge mit einem mit poliertem oder opakem Aluminium beschichteten Träger
EP1819460A1 (de) * 2004-12-03 2007-08-22 Novelis Inc. Prägewalzen von diskreten merkmalen
WO2009127730A1 (de) * 2008-04-18 2009-10-22 Hydro Aluminium Deutschland Gmbh Verfahren zur herstellung eines bandes aus aluminium für verpackungszwecke und derart hergestelltes band
WO2010108953A1 (de) * 2009-03-26 2010-09-30 Hydro Aluminium Deutschland Gmbh Extrusionsbeschichtetes band für starre verpackungen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556874A (en) * 1967-08-01 1971-01-19 Republic Steel Corp Metal articles with controlled finish
GB2144666A (en) * 1983-08-10 1985-03-13 British Steel Corp Mill stand rolls
US4783378A (en) * 1986-06-30 1988-11-08 Kawasaki Steel Corporation Steel sheets for drawing and ironing worked cans
US5537851A (en) * 1993-01-05 1996-07-23 Aluminum Company Of America Sheet product produced by massive reduction in last stand of cold rolling process
US5789066A (en) * 1994-09-16 1998-08-04 Sidmar N.V. Method and device for manufacturing cold rolled metal sheets or strips and metal sheets or strips obtained

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556874A (en) * 1967-08-01 1971-01-19 Republic Steel Corp Metal articles with controlled finish
GB2144666A (en) * 1983-08-10 1985-03-13 British Steel Corp Mill stand rolls
US4783378A (en) * 1986-06-30 1988-11-08 Kawasaki Steel Corporation Steel sheets for drawing and ironing worked cans
US5537851A (en) * 1993-01-05 1996-07-23 Aluminum Company Of America Sheet product produced by massive reduction in last stand of cold rolling process
US5789066A (en) * 1994-09-16 1998-08-04 Sidmar N.V. Method and device for manufacturing cold rolled metal sheets or strips and metal sheets or strips obtained

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 274 (M - 841) 23 June 1989 (1989-06-23) *
SIMAO J M ET AL: "ELECTRICAL DISCHARGE TEXTURING OF COLD MILL WORK ROLLS USING DIFFERENT TOOL ELECTRODE MATERIALS", IRON AND STEEL ENGINEER, ASSOCIATION OF IRON AND STEEL ENGINEERS. PITTSBURGH, US, vol. 73, no. 3, 1 March 1996 (1996-03-01), pages 42 - 47, XP000587195, ISSN: 0021-1559 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1819460A1 (de) * 2004-12-03 2007-08-22 Novelis Inc. Prägewalzen von diskreten merkmalen
EP1819460A4 (de) * 2004-12-03 2011-04-06 Novelis Inc Prägewalzen von diskreten merkmalen
EP1767405A1 (de) * 2005-09-23 2007-03-28 Plastal S.p.A. Verfahren zur Herstellung ästhetischer Fertigteile für Kraftfahrzeuge mit einem mit poliertem oder opakem Aluminium beschichteten Träger
CN102036768B (zh) * 2008-04-18 2017-03-01 海德鲁铝业德国有限责任公司 制造罐装盒、罐装盒盖或罐装盒密封塞的方法
WO2009127730A1 (de) * 2008-04-18 2009-10-22 Hydro Aluminium Deutschland Gmbh Verfahren zur herstellung eines bandes aus aluminium für verpackungszwecke und derart hergestelltes band
US10105748B2 (en) 2008-04-18 2018-10-23 Hydro Aluminium Deutschland Gmbh Method for producing a strip for packaging purposes
CN102036768A (zh) * 2008-04-18 2011-04-27 海德鲁铝业德国有限责任公司 制造用于包装的铝质带体的方法以及所制成的带体
AU2009237610B2 (en) * 2008-04-18 2013-09-12 Hydro Aluminium Deutschland Gmbh Method for producing an aluminum strip for use in packaging and aluminum strip produced by said method
US20120064293A1 (en) * 2009-03-26 2012-03-15 Hydro Aluminium Deutschland Gmbh Extrusion-coated strip for rigid packagings
AU2010227568B2 (en) * 2009-03-26 2013-10-03 Hydro Aluminium Deutschland Gmbh Extrusion-coated strap for rigid packagings
RU2493921C2 (ru) * 2009-03-26 2013-09-27 Гидро Алюминиум Дойчланд Гмбх Лента с нанесенным экструзией покрытием для жестких упаковок
WO2010108953A1 (de) * 2009-03-26 2010-09-30 Hydro Aluminium Deutschland Gmbh Extrusionsbeschichtetes band für starre verpackungen
US10441969B2 (en) 2009-03-26 2019-10-15 Hydro Aluminium Deutschland Gmbh Extrusion-coated strip for rigid packagings

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