EP3134497A1 - Tôle et procédé d'amélioration de la transformabilité d'une tôle - Google Patents

Tôle et procédé d'amélioration de la transformabilité d'une tôle

Info

Publication number
EP3134497A1
EP3134497A1 EP15719678.3A EP15719678A EP3134497A1 EP 3134497 A1 EP3134497 A1 EP 3134497A1 EP 15719678 A EP15719678 A EP 15719678A EP 3134497 A1 EP3134497 A1 EP 3134497A1
Authority
EP
European Patent Office
Prior art keywords
sheet
polyvinyl alcohol
coating
aqueous solution
metal sheet
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
EP15719678.3A
Other languages
German (de)
English (en)
Other versions
EP3134497B1 (fr
Inventor
Ronald Fluch
Bernhard Strauss
Andreas Muhr
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.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl GmbH
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 Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Publication of EP3134497A1 publication Critical patent/EP3134497A1/fr
Application granted granted Critical
Publication of EP3134497B1 publication Critical patent/EP3134497B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/246—Iron or steel

Definitions

  • the invention relates to a sheet and a method for improving the formability of a sheet, in which prior to forming the sheet, an aqueous solution with polyvinyl alcohol is applied to the sheet and then dried and in a subsequent step, the coated sheet surface is oiled.
  • DE69906555T2 discloses treating the sheet with an aqueous solution containing zinc and sulfate ions before applying the oil film. Subsequently, the applied solution is dried, which produces a layer with a basis zinchydroxysulfate on the sheet, which layer unfolds a lubricating effect during forming together with an overlying oil film and thus improves the tribological properties of the sheet.
  • This forming aid is relatively difficult to remove from the sheet and thus adverse effects in subsequent processing steps of the sheet are unavoidable.
  • such forming aids show adverse effects during welding as well as during the bonding of a formed sheet.
  • the invention has therefore, starting from the above-described prior art, the task of providing a method for improving the formability of a sheet, which can easily, easily and reproducibly produce a uniform coating.
  • this coating should be easily removable for subsequent process steps.
  • the invention achieves this object by applying and drying an aqueous solution comprising polyvinyl alcohol, optionally a defoamer, optionally a tracer and the remainder of water, as well as unavoidable production-related impurities, to the sheet.
  • PVA polyvinyl alcohol
  • the handling of the process can be further simplified if the solution optionally has a defoamer, preferably n-octanol.
  • a hydrophobization of the surface of the sheet can be made possible by adding n-octanol in order to increase the corrosion resistance.
  • this composition may also have a tracer in order to be able to easily recognize the coating according to the invention on the metal sheet, for example by metrological means.
  • a tensile pressure forming preferably a deep drawing or drawing and deep drawing
  • a thixotropic oil can be distinguished for oiling.
  • substances or chemical elements used to detect the presence of certain components and / or their amounts commonly referred to as "tracers”. These substances can, for example, emit fluorescence radiation when irradiated with visible light or with ultraviolet radiation and are known for various technical fields of use.
  • the composition can have impurities with in each case not more than 0.05% by weight and not more than 1% by weight in total.
  • polyvinyl alcohol and steel materials can form a particularly strong cohesive connection with a uniform layer thickness.
  • the method according to the invention can be distinguished in the case of a protective-coated sheet, if the aqueous solution is applied to the protective coating with polyvinyl alcohol and dried.
  • this compound forms a particularly stable compound with uniform surface distribution with polyvinyl alcohol, which can ensure complete wetting of the sheet surface with oil.
  • the method can thus reproducibly produce sheets with relatively high tribological properties.
  • High layer thicknesses can be reliably produced if the solution has polyvinyl alcohol up to the solubility limit in water. Among other things, this can avoid that the uniformity of the coating is impaired by disruptive flocculation of polyvinyl alcohol.
  • Comparable simple parameters to be observed for the formation of the solution may result if this solution has 0.5 to 15 wt .-% polyvinyl alcohol.
  • this can result in a sufficiently high tribological property in order to reliably fulfill tight process parameters during forming.
  • this may already be sufficient for a solution with 0.9 to 8 wt .-%, polyvinyl alcohol.
  • aqueous solution with a wet film thickness of 0.1 to 10 ⁇ applied to the plate this may be the uniformity of the layer thickness conducive. Especially a wet film thickness with 1 to 5 ⁇ can lead to improved tribological properties.
  • aqueous solution has partially hydrolyzed polyvinyl alcohol having a degree of hydrolysis of from 72 to 97 mol%, this can further simplify the process and thus further increase its reproducibility.
  • fully hydrolyzed polyvinyl alcohol having a degree of hydrolysis greater than 97 mol% may additionally show improved tribological properties, as a result of which, for example, the amount of polyvinyl alcohol required can be reduced.
  • the formability of the sheet can be further improved if the sheet is surface-coated with 0.5 to 3 g / m A 2 oil.
  • mineral oil preferably a thixotropic oil, may be distinguished for this purpose.
  • n-octanol can be used as defoamer.
  • the invention has also set itself the task of creating a sheet with a forming aid, with which a comparatively narrow process window can be adhered to during forming.
  • the invention achieves the stated object with regard to the sheet in that the coating consists of polyvinyl alcohol, optionally a tracer and production-related unavoidable impurities.
  • the sheet can be coated with a have the same high tribological property to ensure adequate lubrication even at high forming forces.
  • the layer of polyvinyl alcohol ensures that the sheet is heavily wetted with oil, which can prevent film breakage during forming.
  • the sheet metal can thus steadfastly follow even the tight radii of the forming tools and even adhere to narrow process windows during forming, which can occur especially with thin sheets.
  • the layer with polyvinyl alcohol is relatively easy to remove, for example by means of an alkaline cleaning process, and also leads in known cohesive compounds to no adverse effects, especially since polyvinyl alcohol is known from the prior art in adhesive bonds as a primer.
  • polyvinyl alcohol oxidizes without residue during welding or soldering processes and can therefore not adversely affect such compounds, which the invention can distinguish from multicomponent systems in comparison to the prior art.
  • even thin coatings can be measured using the optional tracer.
  • the sheet consists of a steel material, the connection of the coating with polyvinyl alcohol can be facilitated - and thus the deformation behavior of the steel sheet can be further improved.
  • the sheet has a protective coating, in particular based on Zn, to which protective coating the coating with polyvinyl alcohol adjoins, synergy effects between protective coating and polyvinyl alcohol can be used to improve their cohesive connection and thus the forming behavior of the sheet can be further improved.
  • a sufficient improvement in the forming behavior of the sheet can be shown when the coating with polyvinyl alcohol has a coating weight of at least 0.5 mg / m A 2, in particular at least 10 mg / m A 2
  • the properties of the sheet with regard to its formability can be further improved if the film with polyvinyl alcohol is followed by an oil film with a layer weight of 0.5 to 3 g / m A 2.
  • mineral oil preferably a thixotropic oil, may be distinguished for this purpose.
  • the invention may be distinguished when an aqueous solution which comprises polyvinyl alcohol, optionally a defoamer, optionally a tracer and the remainder of water and inevitable impurities due to its production, is used to coat an oil-free sheet to improve the formability of the sheet which has been oiled after coating.
  • an aqueous solution which comprises polyvinyl alcohol, optionally a defoamer, optionally a tracer and the remainder of water and inevitable impurities due to its production, is used to coat an oil-free sheet to improve the formability of the sheet which has been oiled after coating.
  • the aqueous solution is extremely stable due to the small number of components and thus can allow a reproducible coating.
  • this can be of particular importance for steel sheets - especially for sheets with a protective coating preferably Zn-based.
  • Fig. 1 is an enlarged fragmentary sectional view of a coated sheet and Fig. 2 is a comparative diagram of different coated thin sheets.
  • inventive sheet 1 sheet B and C
  • thin sheet A on the protective coating 2 which has a Zn base
  • a full-surface covering coating 3 of polyvinyl alcohol A full surface covering RP4107S oil film 4 made of mineral oil is then applied to this coating 3 in order to increase, for example, the corrosion resistance of the metal sheet 1 as well.
  • the sliding friction coefficients ⁇ were then measured according to the standard ISO 15359, namely over several tests n on the same sheet A, B and C, which can be seen in FIG. Table 2 shows the sliding friction coefficients ⁇ which are averaged over several tests n on the same sheet A, B and C respectively.
  • Table 1 shows the sliding friction coefficients ⁇ which are averaged over several tests n on the same sheet A, B and C respectively.
  • the coating 3 according to the invention of polyvinyl alcohol in the thin sheets B and C leads to no deterioration of the sliding friction coefficient ⁇ over the number of tests n. According to the invention, however, the thin sheets B and C can still guarantee low sliding friction coefficients ⁇ even in the last attempt. The coating 3 can therefore steadfast ensure a particularly low coefficient of sliding friction ⁇ .
  • FIG. 2 it can be seen from FIG. 2 that with fully hydrolyzed polyvinyl alcohol having a degree of hydrolysis greater than 97 mol% in the aqueous solution, a small proportion is sufficient in comparison with the solution of thin sheet B to ensure improved tribological properties.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Lubricants (AREA)

Abstract

L'invention concerne une tôle (1) et un procédé d'amélioration de la transformabilité d'une tôle (1). Une solution aqueuse d'alcool polyvinylique est déposée sur la tôle (1) avant la transformation de la tôle puis est séchée, et la surface de la tôle ainsi revêtue est ensuite huilée. L'invention vise à pouvoir obtenir de manière reproductible une tôle particulièrement avantageusement transformable (1). A cet effet, le procédé consiste à déposer et à faire sécher sur la tôle (1) une solution aqueuse contenant de l'alcool polyvinylique, éventuellement un agent anti-mousse, éventuellement un agent traceur et le restant d'eau, ainsi que des impuretés inévitables dues aux conditions de production.
EP15719678.3A 2014-04-25 2015-04-27 Tôle et procédé destiné à l'amélioration de la déformabilité d'une tôle Active EP3134497B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14166085.2A EP2937411A1 (fr) 2014-04-25 2014-04-25 Tôle et procédé destiné à l'amélioration de la déformabilité d'une tôle
PCT/EP2015/059108 WO2015162304A1 (fr) 2014-04-25 2015-04-27 Tôle et procédé d'amélioration de la transformabilité d'une tôle

Publications (2)

Publication Number Publication Date
EP3134497A1 true EP3134497A1 (fr) 2017-03-01
EP3134497B1 EP3134497B1 (fr) 2019-09-18

Family

ID=50685748

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14166085.2A Withdrawn EP2937411A1 (fr) 2014-04-25 2014-04-25 Tôle et procédé destiné à l'amélioration de la déformabilité d'une tôle
EP15719678.3A Active EP3134497B1 (fr) 2014-04-25 2015-04-27 Tôle et procédé destiné à l'amélioration de la déformabilité d'une tôle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14166085.2A Withdrawn EP2937411A1 (fr) 2014-04-25 2014-04-25 Tôle et procédé destiné à l'amélioration de la déformabilité d'une tôle

Country Status (2)

Country Link
EP (2) EP2937411A1 (fr)
WO (1) WO2015162304A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016209364B4 (de) * 2016-05-31 2020-11-19 BSH Hausgeräte GmbH Verfahren zum Umformen eines Edelstahlfeinblechs unter Verwendung einer Schutzschicht als partieller Auftrag von Polymerpartikeln
DE102018216216A1 (de) 2018-09-24 2020-03-26 Thyssenkrupp Ag Verfahren zur Verbesserung der Phosphatierbarkeit von metallischen Oberflächen, welche mit einer temporären Vor- bzw. Nachbehandlung versehen werden

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6474295A (en) * 1987-08-21 1989-03-20 Akad Wissenschaften Ddr Lubricant and its use
DE3879181D1 (de) * 1988-03-28 1993-04-15 Ecoform Umformtechnik Gmbh Schmiermittel fuer die umformung metallischer werkstoffe.
US6455476B1 (en) * 1998-06-09 2002-09-24 Henkel Corporation Composition and process for lubricated plastic working of metals
US6528182B1 (en) 1998-09-15 2003-03-04 Sollac Zinc coated steel plates coated with a pre-lubricating hydroxysulphate layer and methods for obtaining same
DE10256639A1 (de) * 2002-12-03 2004-06-24 Thyssenkrupp Stahl Ag Schmierstoffbeschichtetes Metallblech mit verbesserten Umformeigenschaften

Also Published As

Publication number Publication date
EP2937411A1 (fr) 2015-10-28
WO2015162304A1 (fr) 2015-10-29
EP3134497B1 (fr) 2019-09-18

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