EP0132650A1 - Aluminiumlegierung für profilierte Karosserieelemente von Fahrzeugen und Verfahren zu deren Herstellung - Google Patents

Aluminiumlegierung für profilierte Karosserieelemente von Fahrzeugen und Verfahren zu deren Herstellung Download PDF

Info

Publication number
EP0132650A1
EP0132650A1 EP84107852A EP84107852A EP0132650A1 EP 0132650 A1 EP0132650 A1 EP 0132650A1 EP 84107852 A EP84107852 A EP 84107852A EP 84107852 A EP84107852 A EP 84107852A EP 0132650 A1 EP0132650 A1 EP 0132650A1
Authority
EP
European Patent Office
Prior art keywords
alloy
shaped elements
vehicles
elements
process according
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Withdrawn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
EP84107852A
Other languages
English (en)
French (fr)
Inventor
Domenico Morri
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.)
Aluminia SpA
Original Assignee
Aluminia SpA
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 Aluminia SpA filed Critical Aluminia SpA
Publication of EP0132650A1 publication Critical patent/EP0132650A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent

Definitions

  • This invention relates to an aluminium alloy and to a process, which is particularly useful for manufacturing, with said alloy, structural shaped elements of vehicles, in particular simple shaped elements or box-type composite shaped elements for motor vehicles, such as hoods for motors and for baggage compartments, doors, mudguards, roofs, panelings and the like.
  • the present tendency is to manufacture lighter and lighter motor vehicles in order to obtain several advantages, known to the technicians of this branch, among which, in particular, that of achieving substantial savings in the energy required in the running of said motor vehicles.
  • the physical-mechanical properties of the alloy must be such as to assure a good resistance to dent, the possibility of carrying out, without defects, seaming operations with "block” folding, and, finally, of avoiding, during forming, the formation of "Lueder bands" which, as is known, may appear on a surface of a metal when such metal is deformed beyond its elastic limit (with creep of the metal itself), and which involve successive surface treatment operations.
  • the current technology is prevailingly directed to utilize two different alloy families, namely : a first family characterized by the optimization of the mechanical characteristics (to the prejudice of the formability which results to be by far lower than the one of mild steel) for the use in the outer panelings, and a second family characterized by the optimization of the formability (to the prejudice of the mechanical resistance) for the use in the inner frameworks, which require very marked shapings.
  • alloy 6009-T4 designation according to Aluminium Association
  • alloy 5182-0 is predominantly used.
  • the typical compositions of such alloys are those known and indicated hereinbelow (% by weight) :
  • the aluminium alloys of said first family are not susceptible of being shaped in conventional dies as are utilized for the shaping of mild steel, wherefore it is practical impossible to use the existing pressing lines of the automotive industry, what entails, of course, disadvantages of both technical and economical nature.
  • Another object of the present invention resides in a process for manufacturing shaped elements of vehicles starting from cast plates and billets of said alloy, in particular for manufacturing box-type composite shaped elements for motor vehicles.
  • the alloy according to the invention is obtained by casting into water a body having the above-indicated composition, in the form of a rolling plate or of an extrusion billet.
  • Said plate is homogen ized at a temperature in the range of from 540 to 580°C for a time of maximum 24 hours under steady state (usually 8-12 hours), whereupon it is quenched to room temperature, preferably by means of water rain.
  • said cooling can be stopped at the rough-working temperature, as explained hereinafter).
  • the so homogenized alloy plate is then roughly worked, by subjecting it to strong runs, starting from a pre--heating temperature ranging from 460° to 500°C.
  • the preheating time period for rough-working shall be as short as possible.
  • the rough-worked plate is then directly transformed,by rolling, into semifinished products in the form of sheets having final thicknesses,already suitable for use, in the range of from 0.7 to 1.5 mm.
  • Said semifinished products are then subjected to a solution heat-treatment by means of heating to 525°-535°C (5-10 minutes under steady state) followed by hardening by means of water quenching.
  • a solution heat-treatment/hardening step Mg 2 Si forms in a supersaturated solid solution at room temperature, while free Mg remains dissolved in aluminium since the amounts of Mg and Si in the alloy, according to the invention, are reciprocally proportioned in such amounts as to have a stoichiometric excess of Mg in respect of said Mg 2 Si compound, to the specific purpose of attaining an optimization of the alloy's formability characteristics, in particular of its drawability.
  • said Mg excess shall not exceed amounts of the order of 0.6-0.7% by weight, because a high- erMgexcess would reduce the solubility of said compound Mg 2 Si in Al and, consequently, the hardening effect by precipitation of same during the successive artificial ageing step after forming (as better illustrated later), which causes an increase in the mechanical resistance of the alloy.
  • Said hardened sheets are flattened and then allowed to naturally age at room temperature (T4 state): after 15 days, the yielding values are substantially stabilized at low values, and the sheets are ready for being formed into shah ed elements in an easy and stable manner.
  • the alloy composition and relevant metallurgical working cycle (described hereinabove) are combined in such way as to impart to the semifinished products (sheets, structural shapes) in the T4 state, ready for the forming operations, a yield strength Rp 0.2 and an elastic modulus (E) such that the Rp 0.2/E ratio ranges from 1.2 x x 10 -3 to 1.7 ⁇ 10 -3 (very close to the one of steels for deep pressing), so that the semifinished products are particularly suited to be easily shaped in a stable manner (i.e. with an exact shape retaining after shaping) and free from defects, also by means of dies and with conventional pressing process used for steel, without bringing substantial modifications thereto.
  • the semifinished products in state T4 mentioned above are then transformed, by cold-pressing, into shaped elements for vehicles, such elements, after pressing, being subjected to an artificial ageing operation to bring about hardening (precipitation of Mg 2 Si) with consequent raising of the mechanical characteristics to a substantial stability level, with a yield strength ranging from 165 to 200 N/ mm.
  • Said artificial ageing is accomplished by heating said shaped elements to a temperature from 180° to 220°C for a time between- 30 and 90 minutes.
  • said shaped elements Before said ageing step, said shaped elements can be provided with a surface coating (painting) susceptible of hot-hardening, so that, in a single successive heating step at 180-220°C, the abovesaid artificial ageing of the alloy as well as the stable hardening of the paint take place.
  • the abovesaid shaped elements can be utilized for outer panelings as well as for inner frameworks of vehicle components, in particular box-type composite components of motor vehicles, such as hoods for motors and for baggage compartments,doors,mudguards,roofs and the like,since, as is mentioned hereinabove, the semifinished parts (sheets, structural shapes) obtained from the alloy and by the process according to the invention are, in state T4, easily shapable without defects (in particular: without Lueder bands) and, after shaping, they can be hardened till assuming, permanently, a high mechanical resistance.
  • the formability-drawability and shape stability of the alloy according to the invention are better than those (already good) of alloy 5182-0, and very close to those (excellent) of deep pressing steel FeP04 (UNI 8092, according to Italian Standards UNI), while the deformation resistance characteristics (after artificial ageing) are always higher than those of alloy 5182-0 and only slightly lower than those of alloy 6009-T4, in respect of which, however, the alloy of the invention has the considerable advantage of improving both formability and shape retaining (as will be proved later on, in the examples).
  • state T4 The formability of the alloy sheets according to the invention (state T4) enables to seam the sheets' edges by "block” folding, as shows position 2 in figure 2, while the mechanical strength of said sheets after shaping and artificial ageing secures a good resistance to dent to shaped elements.
  • the alloy and the relevant process for transforming same permit to obtain a statistically disoriented and substantially free from rough precipitates, fine grain recrystallization structure of the alloy, said structure being suitable for ensuring, besides excellent formability properties, also an excellent corrosion resistance.
  • a composite component for vehicles for example a motor hood represented in figure 1, to which reference is made here
  • a composite component for vehicles which has to be composed of an outer shaped paneling 1a (endowed with a good shape stability with surface flatness, as well as with a good dent resistance) and of an inner reinforcing framework 1b shaped to deep and complex forms
  • a single alloy namely the alloy of the invention, which thus replaces both alloy 5182-0 in said inner framework, and alloy 6009-T4 in said outer paneling.
  • Said plate was homogenized by means of a 12-hour heating at 560°C (followed by water-rain cooling) and then rough-shaped after heating to 475°C.
  • the rough-shaped product so obtained was then rolled, by a conventional method, till obtaining a sheet with a thickness of 0.9 mm.
  • This sheet was subjected to a solution heat-treatment-hardening by heating to 530°C (8 minutes) followed by cooling with water-rain.
  • the so hardened sheet was allowed to age at room temperature for 15 days, thus obtaining said alloy in the T4 state, the characteristics of which are indicated in Tables I and II (in such Tables, the alloy is designated as AI-02/1).
  • Said plate was homogenized, rough-shaped, rolled, hardened and aged by processes and relevant parameters (temperatures, times) substantially like those of Example 1.
  • Example 2 Using 0.9 mm thick sheets in the T4 state obtained in Example 2, there were formed (employing conventional forming dies and cycles as are utilized for mild steel) two shaped elements, respectively an outer element and an inner element for motor-vehicle motor-hood (indicated with 1a and 1b in figures 1 and 2).
  • Example 2 Following the process of Example 1, there were prepared two sheets having a thickness of 0.9 mm (up to the artificial ageing state for 1 hour at 220°C), respectively made of an alloy AI/3 and of an alloy AI/4, both comprising Fe, Al and other elements, such as impurities, in amounts substantially equal to those of the alloy according to the invention of example 2, while Si and Mg were in different amounts from those of the alby according to the invention, namely :
  • alloy AI/3 in relation to the too low Si content, Mg 2 Si did not form in a sufficient amount to cause the desired hardening, while in the AI/4 alloy the too high free Mg content above the stoichiometric composition Mg Si(1.3%) brought about an inhibiting effect on the solid solubility of Mg 2 Si in Al during the solution heat-treatment,with consequent substantial decrease of hardening (due to insufficient precipitation of said Mg 2 Si during artificial ageing), as is proved by the data recorded in Table III, compared with the ones of alloy AI/02 of examples 1 and 2 (all the alloys are in state T6, after a 1-hour artificial ageing at 200°C).
  • the aluminium alloy according to the invention is particularly suited to be used in shaped elements for vehicles, but, as is evident, it can find a useful utilization in all those appliances which require an Al-based light alloy endowed with balanced characteristics of formability, shape stability and mechanical stregth.
  • the alloy according to the invention is employable, in a few cases, in composite shaped elements comprising one or more shaped elements consisting of said alloy and one or more shaped elements consisting of another material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Body Structure For Vehicles (AREA)
EP84107852A 1983-07-19 1984-07-05 Aluminiumlegierung für profilierte Karosserieelemente von Fahrzeugen und Verfahren zu deren Herstellung Withdrawn EP0132650A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2211983 1983-07-19
IT22119/83A IT1163803B (it) 1983-07-19 1983-07-19 Lega di alluminio per elementi sagomati strutturali di veicoli e procedimento per ottenere detti elementi

Publications (1)

Publication Number Publication Date
EP0132650A1 true EP0132650A1 (de) 1985-02-13

Family

ID=11191770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107852A Withdrawn EP0132650A1 (de) 1983-07-19 1984-07-05 Aluminiumlegierung für profilierte Karosserieelemente von Fahrzeugen und Verfahren zu deren Herstellung

Country Status (2)

Country Link
EP (1) EP0132650A1 (de)
IT (1) IT1163803B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0245464A1 (de) * 1985-11-04 1987-11-19 Aluminum Co Of America Fahrzeugteil aus aluminiumlegierung.
US5085097A (en) * 1987-08-31 1992-02-04 Toyoda Gosei Co., Ltd. Steering wheel core
US5204043A (en) * 1990-01-13 1993-04-20 Toyoda Gosei Co., Ltd. Method of manufacturing steering wheel
EP0548007A1 (de) * 1991-12-16 1993-06-23 Alusuisse-Lonza Services Ag Karosserieblech
US5573606A (en) * 1995-02-16 1996-11-12 Gibbs Die Casting Aluminum Corporation Aluminum alloy and method for making die cast products
DE19754170A1 (de) * 1997-12-06 1999-06-10 Volkswagen Ag Leichtmetallbauteil
DE4419218C2 (de) * 1993-07-22 1999-10-28 Opel Adam Ag Großflächiges Karosserieelement eines Kraftfahrzeugs, insbesondere Motor- oder Kofferraumhaube

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1294031B (de) * 1961-07-03 1969-04-30 Aluminum Co Of America Verfahren zur Waermebehandlung einer anodisch zu oxydierenden Al-Mg-Si-Knetlegierung
FR2158729A5 (en) * 1971-10-29 1973-06-15 Cegedur Aluminium- copper- magnesium alloy - for automobile body sheet materials undergoing stove-enamelling
DE1608159A1 (de) * 1967-07-22 1973-08-16 Honsel Werke Ag Aluminium-magnesium-siliziumlegierung
FR2264885A1 (de) * 1974-03-18 1975-10-17 Alusuisse
US4043840A (en) * 1976-07-09 1977-08-23 Swiss Aluminium Ltd. Aluminum alloys possessing improved resistance weldability
FR2351182A1 (fr) * 1976-04-16 1977-12-09 Sumitomo Light Metal Ind Nouveaux alliages d'aluminium

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1294031B (de) * 1961-07-03 1969-04-30 Aluminum Co Of America Verfahren zur Waermebehandlung einer anodisch zu oxydierenden Al-Mg-Si-Knetlegierung
DE1608159A1 (de) * 1967-07-22 1973-08-16 Honsel Werke Ag Aluminium-magnesium-siliziumlegierung
FR2158729A5 (en) * 1971-10-29 1973-06-15 Cegedur Aluminium- copper- magnesium alloy - for automobile body sheet materials undergoing stove-enamelling
FR2264885A1 (de) * 1974-03-18 1975-10-17 Alusuisse
FR2351182A1 (fr) * 1976-04-16 1977-12-09 Sumitomo Light Metal Ind Nouveaux alliages d'aluminium
FR2351183A1 (fr) * 1976-04-16 1977-12-09 Sumitomo Light Metal Ind Nouveaux alliages d'aluminium
US4043840A (en) * 1976-07-09 1977-08-23 Swiss Aluminium Ltd. Aluminum alloys possessing improved resistance weldability

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0245464A1 (de) * 1985-11-04 1987-11-19 Aluminum Co Of America Fahrzeugteil aus aluminiumlegierung.
EP0245464A4 (de) * 1985-11-04 1988-03-22 Aluminum Co Of America Fahrzeugteil aus aluminiumlegierung.
US5085097A (en) * 1987-08-31 1992-02-04 Toyoda Gosei Co., Ltd. Steering wheel core
US5204043A (en) * 1990-01-13 1993-04-20 Toyoda Gosei Co., Ltd. Method of manufacturing steering wheel
EP0548007A1 (de) * 1991-12-16 1993-06-23 Alusuisse-Lonza Services Ag Karosserieblech
CH685707A5 (de) * 1991-12-16 1995-09-15 Alusuisse Lonza Services Ag Karosserieblech.
DE4419218C2 (de) * 1993-07-22 1999-10-28 Opel Adam Ag Großflächiges Karosserieelement eines Kraftfahrzeugs, insbesondere Motor- oder Kofferraumhaube
US5573606A (en) * 1995-02-16 1996-11-12 Gibbs Die Casting Aluminum Corporation Aluminum alloy and method for making die cast products
DE19754170A1 (de) * 1997-12-06 1999-06-10 Volkswagen Ag Leichtmetallbauteil

Also Published As

Publication number Publication date
IT1163803B (it) 1987-04-08
IT8322119A0 (it) 1983-07-19

Similar Documents

Publication Publication Date Title
US4614552A (en) Aluminum alloy sheet product
EP2440680B1 (de) Automobilkonstruktionsteil, das aus einem alznmgcu-legierungsprodukt hergestellt ist, und verfahren zu dessen herstellung
US6224992B1 (en) Composite body panel and vehicle incorporating same
CA1286208C (en) Aluminum alloy vehicular member
US9254879B2 (en) Formed automotive part made from an aluminium alloy product and method of its manufacture
US5582660A (en) Highly formable aluminum alloy rolled sheet
JPS5939499B2 (ja) 車両用構造部材の製法
KR100964855B1 (ko) 차체 외장 패널용 Ａｌ-Ｓｉ-Ｍｇ 합금 시트
US20130009422A1 (en) Autobody Skin Piece Made of an Al-Si-Mg Sheet Metal Alloy and Fixed to a Steel Structure
WO2010049445A1 (en) Structural automotive component of an aluminium alloy sheet product
US3935007A (en) Aluminum alloy of age hardening type
JP3944865B2 (ja) 自動車の構造に適用するための析出硬化アルミニウム合金
US5525169A (en) Corrosion resistant aluminum alloy rolled sheet
US6344096B1 (en) Method of producing aluminum alloy sheet for automotive applications
US5919323A (en) Corrosion resistant aluminum alloy rolled sheet
KR100481231B1 (ko) ＡｌＭｇＳｉ 타입 알루미늄 합금으로 제조된 제품
EP0132650A1 (de) Aluminiumlegierung für profilierte Karosserieelemente von Fahrzeugen und Verfahren zu deren Herstellung
JP2019529693A (ja) アルミニウム合金及び歩行者衝突保護用アルミニウム合金ストリップ
WO2020178076A1 (en) Method of manufacturing an automotive part from a 7xxx-series aluminium alloy
CA1193889A (en) Wrought aluminium alloy
CH690916A5 (de) Tiefziehbare und schweissbare Aluminiumlegierung vom Typ AlMgSi.
JP4253140B2 (ja) アルミニウム合金パネル材のヘム加工方法およびアルミニウム合金パネル材
EP0714993B1 (de) Tiefziehbare und schweissbare Aluminiumlegierung vom Typ ALMgSi
WO1997047779A1 (en) Highly formable aluminum alloy rolled sheet
WO2024097460A1 (en) High recycle content 6xxx series aluminum alloys and methods for preparing the same

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

17P Request for examination filed

Effective date: 19850606

17Q First examination report despatched

Effective date: 19860311

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALUMINIA S.P.A.

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19870316

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MORRI, DOMENICO