WO1999061242A1 - Method for producing bright light-metal composite plates, especially plates for the aviation industry - Google Patents

Method for producing bright light-metal composite plates, especially plates for the aviation industry Download PDF

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Publication number
WO1999061242A1
WO1999061242A1 PCT/EP1999/003633 EP9903633W WO9961242A1 WO 1999061242 A1 WO1999061242 A1 WO 1999061242A1 EP 9903633 W EP9903633 W EP 9903633W WO 9961242 A1 WO9961242 A1 WO 9961242A1
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WO
WIPO (PCT)
Prior art keywords
thickness
core
corrosion protection
block made
layer
Prior art date
Application number
PCT/EP1999/003633
Other languages
German (de)
French (fr)
Inventor
Markus Plakolm
Frank Müller
Franz Eder
Original Assignee
Aluminium Ranshofen Walzwerk Gesellschaft Mbh
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 Aluminium Ranshofen Walzwerk Gesellschaft Mbh filed Critical Aluminium Ranshofen Walzwerk Gesellschaft Mbh
Publication of WO1999061242A1 publication Critical patent/WO1999061242A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/12—Electrodes characterised by the material
    • C23F13/14—Material for sacrificial anodes

Abstract

The invention relates to a method for producing bright light-metal composite plates, especially plates for the aviation industry, comprising a core layer of a hardenable aluminium alloy and a cathodic anti-corrosion layer on one or both sides which consists of a more basic metal on an aluminium base. Said method comprises the following steps: placing a block made of the material intended for the anti-corrosion layer(s) onto one or both sides of a block made of the core layer material, where the thickness of each block made of the material for the anti-corrosion layer in relation to the thickness of the block made of the core material is selected in accordance with the desired ratio of anti-corrosion layer thickness to core layer thickness; joining of the blocks made of the material(s) for the anti-corrosion layer(s) and the core layer by cladding rolling in several passes, possibly with intermediate annealing, until the desired final thickness is obtained; solution annealing of the resulting composite plate; quenching of the solution-annealed composite plate; rerolling of the quenched composite plate; and ageing of the rerolled composite plate so as to harden the core material. According to the invention the rerolling comprises a burnishing-rolling stage.

Description

Verfahren zur Herstellung glänzender Leichtmetall-Verbundbleche, insbesondere Luftfahrtbleche Process for the production of shiny light metal composite sheets, in particular aviation sheets
BesehreibungDescription
Die Erfindung betrifft ein Verfahren zur Herstellung glänzender Leichtmetall-Verbundbleche, insbesondere Luftfahrtbleche, mit eine Kernschicht aus einer aushärtbaren Aluminiumlegierung und einer ein- oder beidseitigen kathodischen Korrosionsschutzschicht aus einem unedleren Material auf Aluminiumbasis.The invention relates to a method for producing glossy light metal composite sheets, in particular aviation sheets, with a core layer made of a hardenable aluminum alloy and a cathodic corrosion protection layer on one or both sides made of a base material based on aluminum.
Es ist bekannt, Bleche dieser Art mit den Verfahrensschritten gemäß Oberbegriff des Patentanspruchs 1 herzustellen.It is known to produce sheets of this type with the method steps according to the preamble of claim 1.
Der Kernwerkstoff ist typischerweise eine AlC (Mg) -Legierung mit der Bezeichnung AA2XXX bzw. eine AlZnMg(Cu)- Legierung mit der Bezeichnung AA7XXX. Als Werkstoff für die Korrosionsschutzschicht wird üblicherweise Reinaluminium für die 2XXX-Legierung oder eine AIZnl-Legierung mit der Bezeichnung 7072 für den Kernwerkstoff AA7XXX verwendet.The core material is typically an AlC (Mg) alloy with the designation AA2XXX or an AlZnMg (Cu) alloy with the designation AA7XXX. Pure aluminum for the 2XXX alloy or an AIZnl alloy with the designation 7072 for the core material AA7XXX is usually used as the material for the corrosion protection layer.
Im Rahmen des bekannten Verfahrens erfolgt seit Jahr- zehnten das Glänzen des Blechs nach dem Auslagern durch mechanisches Polieren. Dieser Vorgang ist sehr arbeitsaufwendig. Das Blech wird mittels Stoffbürsten und Diamantpaste poliert. Nachteilig ist, daß die Blechoberfläche eine deutliche Polierstruktur und ein graues Erscheinungsbild zeigt. Darüber hinaus verringert sich die Dicke der Korrosions- schutzschicht durch den mechanischen Abtrag örtlich ungleichmäßig, so daß auch der durch die kathodische, d.h. gegenüber dem Kernwerkstoff unedlere, Korrosionsschutzschicht bewirkte Korrosionsschutz örtlich ungleichmäßig ist. Darüber hinaus ergibt sich durch Schleif- und Polierfehler ein Ausschuß bis zu 20 % der angelieferten Bleche. Der Poliermittelabfall ist nachteiligerweise als Sondermüll zu entsorgen, da er mit Schleifmittel und Aluminiumabrieb kontaminiert ist .As part of the known method, tenth the sheen of the sheet after aging by mechanical polishing. This process is very labor intensive. The sheet is polished using fabric brushes and diamond paste. The disadvantage is that the sheet surface has a clear polishing structure and a gray appearance. In addition, the thickness of the corrosion protection layer is locally unevenly reduced by the mechanical removal, so that the corrosion protection caused by the cathodic, ie less noble than the core material, corrosion protection layer is locally uneven. In addition, grinding and polishing errors result in rejects of up to 20% of the delivered sheets. The waste of polishing agents is disadvantageously to be disposed of as special waste, since it is contaminated with abrasives and aluminum debris.
Aufgabe der Erfindung ist es, das Verfahren gemäß Oberbegriff des Patentanspruchs 1 so zu gestalten, daß sich bei verringertem Arbeitsaufwand ein verbessertes Glanzergebnis erzielen läßt .The object of the invention is to design the method according to the preamble of claim 1 so that an improved gloss result can be achieved with reduced workload.
Diese Aufgabe wird erfindungsgemäß mit einem Verfahren mit den Merkmalen des Patentanspruchs l gelöst .This object is achieved according to the invention with a method having the features of patent claim 1.
Bevorzugt wird ein einziger Nachwalzschritt durchgeführt, der in einem Arbeitsgang gleichzeitig der Gefügeverbesserung und der Glanzerzeugung dient.A single rerolling step is preferably carried out, which simultaneously serves to improve the structure and generate the gloss in one work step.
Soll das Blech nur einseitig hochglänzend sein, so wird im Glanzwalzschritt als Unterwalze eine Walze mit rauherem Schliff verwendet.If the sheet is only to have a high gloss on one side, a roller with a rougher cut is used as the bottom roller in the gloss roller step.
Wenngleich der Walzpoliervorgang auf einer weichen Oberfläche durchgeführt wird, ist das optische Erscheinungsbild gegenüber dem bekannten mechanischen Polieren maßgeblich verbessert. Der Glanzwert, gemessen nach Dr. Lange, erhöht sich auf GW 60 bis GW 70 gegenüber GW 50 beim mechanischem Polieren. Der Ausschuß verringert sich praktisch auf null, was zu einer erheblichen Verringerung der Herstel- lungskosten führt. Darüber hinaus entsteht nach dem erfindungsgemäßen Verfahren beim Polieren nahezu kein Abfall, so daß sich die Umweltbelastung und die Entsorgungskosten verringern.Although the roll polishing process is carried out on a soft surface, the visual appearance is significantly improved compared to the known mechanical polishing. The gloss value, measured according to Dr. Lange, increases to GW 60 to GW 70 compared to GW 50 for mechanical polishing. The committee is practically reduced to zero, which leads to a considerable reduction in manufac costs. In addition, almost no waste arises during the polishing according to the invention, so that the environmental impact and the disposal costs are reduced.
Entgegen dem vorbekannten Verfahren erfolgt der Walzvorgang vorzugsweise in Bandform. Das Plattierwalzen über mehrere Stiche folgt vorzugsweise mit verringerten Rauhigkeiten der Walzen und unter Zwischenbeizung. Die Stichabnahme liegt zwischen 0,5 und 30 %, wobei die Walzgeschwindigkeit bis zu 400 m/min beträgt. Contrary to the previously known method, the rolling process is preferably carried out in strip form. The plating rolling over several passes preferably follows with reduced roughness of the rolls and with intermediate pickling. The stitch decrease is between 0.5 and 30%, the rolling speed being up to 400 m / min.

Claims

1. Verfahren zur Herstellung glänzender Leichtmetall- Verbundbleche, insbesondere Luftfahrtbleche, mit einer Kernschicht aus einer aushärtbaren Aluminiumlegierung und einer ein- oder beidseitigen kathodischen Korrosionsschutzschicht aus einem unedleren Material auf Aluminiumbasis mit folgenden Verfahrensschritten:1. Process for the production of shiny light metal composite sheets, in particular aviation sheets, with a core layer made of a hardenable aluminum alloy and a one- or both-sided cathodic corrosion protection layer made of a less noble aluminum-based material with the following process steps:
Belegen eines Blockes aus dem Werkstoff der Kernschicht ein- oder beidseitig mit einem Block aus dem Werkstoff der jeweils vorgesehenen Korrosionsschutzschicht, wobei die Dicke des jeweiligen Blockes aus dem Werkstoff der Korrosionsschutzschicht im Verhältnis zur Dicke des Blockes aus dem Kernwerkstoff entsprechend dem gewünschten Verhältnis von Stärke der jeweiligen Korrosionsschutzschicht zur Stärke der Kernschicht gewählt wird,Covering a block made of the material of the core layer on one or both sides with a block made of the material of the intended corrosion protection layer, the thickness of the respective block made of the material of the corrosion protection layer in relation to the thickness of the block made of the core material corresponding to the desired ratio of the thickness of the the respective corrosion protection layer is chosen for the thickness of the core layer,
Vereinigen der Blöcke aus dem Werkstoff bzw. den Werkstoffen der Korrosionsschutzschicht bzw. der Korrosionsschutzschichten und der Kernschicht durch Walzplattieren in mehreren Stichen ggfs. unter Zwischenglühen, auf etwa die gewünschte Fertigdicke,Combining the blocks of the material or the materials of the corrosion protection layer or the corrosion protection layers and the core layer by roll cladding in several passes, possibly with intermediate annealing, to about the desired finished thickness,
Lösungsglühen des gewonnenen Verbundblechs, Abschrecken des lösungsgeglühten Verbundblechs, Nachwalzen des abgeschreckten Verbundblechs und Auslagerung des nachgewalzten Verbundblechs zur Aushärtung des Kernwerkstoffs, dadurch gekennzeichnet, daß das Nachwalzen einen Glanzwalzschritt aufweist .Solution annealing of the composite sheet obtained, quenching the solution-annealed composite sheet, re-rolling the quenched composite sheet and aging of the re-rolled composite sheet to harden the core material, characterized in that the post-rolling has a bright rolling step.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Nachwalzen in einem der Gefügeverbesserung und der Glanzerzeugung dienenden Schritt durchgeführt wird. 2. The method according to claim 1, characterized in that the re-rolling is carried out in a step serving to improve the structure and generate the gloss.
PCT/EP1999/003633 1998-05-26 1999-05-26 Method for producing bright light-metal composite plates, especially plates for the aviation industry WO1999061242A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823472.4 1998-05-26
DE1998123472 DE19823472A1 (en) 1998-05-26 1998-05-26 Process for the production of shiny light metal composite sheets, in particular aviation sheets

Publications (1)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2450767C (en) 2001-07-23 2010-09-14 Corus Aluminium Walzprodukte Gmbh Weldable high strength al-mg-si alloy
DE102004002899A1 (en) * 2004-01-20 2005-08-11 Erbslöh Aluminium Gmbh Decorative sheet metal component for e.g. motor vehicle part, has cavity in mechanical and chemical treated upper surface, where component is made of hard aluminium material e.g. aluminium magnesium silicon alloy
DE102004002840B4 (en) * 2004-01-20 2006-08-10 Erbslöh Aluminium Gmbh Method for producing a decorative, solid sheet metal part
EP1849542B1 (en) * 2006-04-25 2013-03-20 Hydro Aluminium Deutschland GmbH Method of manufacture a high-mirror-finished strip by clad rolling

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US3310389A (en) * 1963-10-02 1967-03-21 High Duty Alloys Ltd Sheets of aluminum alloy and methods of manufacturing same
US3881883A (en) * 1971-06-01 1975-05-06 Reynolds Metals Co Clad composites and aluminous metal compositions for cladding
US4410370A (en) * 1979-09-29 1983-10-18 Sumitomo Light Metal Industries, Ltd. Aircraft stringer material and method for producing the same
EP0473122A1 (en) * 1990-08-27 1992-03-04 Aluminum Company Of America Damage tolerant aluminum alloy sheet for aircraft skin
EP0489408A1 (en) * 1990-12-03 1992-06-10 Aluminum Company Of America Aircraft sheet
US5213639A (en) * 1990-08-27 1993-05-25 Aluminum Company Of America Damage tolerant aluminum alloy products useful for aircraft applications such as skin
WO1995007775A1 (en) * 1993-09-17 1995-03-23 Sidmar N.V. Method and device for manufacturing cold rolled metal sheets or strips, and metal sheets or strips obtained
EP0690142A1 (en) * 1994-06-09 1996-01-03 The Furukawa Electric Co., Ltd. Aluminium alloy sheet for auto body sheet, method for manufacturing same and method for forming same
EP0773303A1 (en) * 1995-11-10 1997-05-14 Nkk Corporation Aluminium alloy sheet manufacturing method therefor
EP0806253A1 (en) * 1994-05-04 1997-11-12 Aluminum Company Of America Sheet product produced by massive reduction in last stand of cold rolling process
US5723221A (en) * 1996-04-26 1998-03-03 Formica Corporation Aluminous press plate and process for producing same

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Publication number Priority date Publication date Assignee Title
US3310389A (en) * 1963-10-02 1967-03-21 High Duty Alloys Ltd Sheets of aluminum alloy and methods of manufacturing same
US3881883A (en) * 1971-06-01 1975-05-06 Reynolds Metals Co Clad composites and aluminous metal compositions for cladding
US4410370A (en) * 1979-09-29 1983-10-18 Sumitomo Light Metal Industries, Ltd. Aircraft stringer material and method for producing the same
EP0473122A1 (en) * 1990-08-27 1992-03-04 Aluminum Company Of America Damage tolerant aluminum alloy sheet for aircraft skin
US5213639A (en) * 1990-08-27 1993-05-25 Aluminum Company Of America Damage tolerant aluminum alloy products useful for aircraft applications such as skin
EP0489408A1 (en) * 1990-12-03 1992-06-10 Aluminum Company Of America Aircraft sheet
WO1995007775A1 (en) * 1993-09-17 1995-03-23 Sidmar N.V. Method and device for manufacturing cold rolled metal sheets or strips, and metal sheets or strips obtained
EP0806253A1 (en) * 1994-05-04 1997-11-12 Aluminum Company Of America Sheet product produced by massive reduction in last stand of cold rolling process
EP0690142A1 (en) * 1994-06-09 1996-01-03 The Furukawa Electric Co., Ltd. Aluminium alloy sheet for auto body sheet, method for manufacturing same and method for forming same
EP0773303A1 (en) * 1995-11-10 1997-05-14 Nkk Corporation Aluminium alloy sheet manufacturing method therefor
US5723221A (en) * 1996-04-26 1998-03-03 Formica Corporation Aluminous press plate and process for producing same

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