EP2421996B1 - Automaten-aluminium-aa 6xxx legierung - Google Patents

Automaten-aluminium-aa 6xxx legierung Download PDF

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Publication number
EP2421996B1
EP2421996B1 EP10716375.0A EP10716375A EP2421996B1 EP 2421996 B1 EP2421996 B1 EP 2421996B1 EP 10716375 A EP10716375 A EP 10716375A EP 2421996 B1 EP2421996 B1 EP 2421996B1
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EP
European Patent Office
Prior art keywords
alloys
alloy
content
phases
machining
Prior art date
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EP10716375.0A
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English (en)
French (fr)
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EP2421996A1 (de
Inventor
Mary-Anne Kulas
Ivo Kolarik
Josef Kreuter
Annabelle Bigot
Guy-Michel Raynaud
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Constellium Extrusions Decin sro
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Constellium Extrusions Decin sro
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Publication of EP2421996A1 publication Critical patent/EP2421996A1/de
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
    • 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
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • 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
    • 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
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon

Definitions

  • the invention relates to the field of low-cut parts obtained from single spun or extruded products, essentially of the bar or rod type, made of aluminum alloy of the AA6xxx series, the chemical composition of which is optimized according to the spinnability and free cutting and which is in particular devoid of low melting point elements such as in particular lead, bismuth, indium or tin.
  • Bar turning refers to a field of manufacture by machining, in large series, of parts generally of revolution (screw, bolt, shaft, etc.) by removal of material from bars or rods of metal. These, especially in the case of aluminum alloys, are generally obtained by spinning or extrusion from billets. The parts are produced at high speeds on manual or digital cutting machines.
  • the productivity and the surface condition as well as the dimensional accuracy of the final part are the main objectives attached to this type of manufacturing.
  • the pieces thus produced find their application in various fields, from watchmaking to medical equipment, through the fields of transport (aeronautics, railway, automobile) and industrial (electrical, electronic, hydraulic ).
  • the first aluminum alloys used for bar turning in the 1930s to 1960s were alloys of the AA6xxx and AA2xxx series containing, in addition to the usual compositional elements for these series, lead and bismuth. These elements, due to their low solubility in aluminum and their low melting point, melt under the effect of the heating caused by the machining operation and therefore constitute soft spots in a matrix more hard aluminum.
  • the positive result thus obtained lies in the fragmentation of chips of small sizes during said machining or machining operation. This fragmentation allows a rapid evacuation of the material, thus a gain in productivity, but also an evacuation of the heat produced, thus avoiding a possible degradation of the final surface state of the part.
  • alloys containing low-melting substitution elements such as tin, bismuth or indium, do not exhibit exactly the same performance in bar turning as alloys containing lead, while the total prohibition The latter could intervene in the relatively short term.
  • a solution to this problem is the use of an alloy whose aluminum-based matrix has harder particles, the origin of the creation and propagation of cracks during the bar turning operation, these cracks favoring chip fragmentation.
  • Solutions of this type known from the prior art are all based on the addition of silicon at a minimum content of 1.5% which corresponds to the limit of solubility of silicon in aluminum.
  • the silicon alloy thus formed comprises hard phases based on silicon, at the origin of the creation and propagation of the aforementioned cracks. Indeed, these phases prevent slippage of the grains during the deformation induced by the machining operation, or bar turning, which gives rise to cavities and cracks and thus promotes chip fragmentation.
  • Requirement WO 2015 / 100623A discloses a spinning product of a machined AlMgSi alloy, preferably in extruded form, for machining or machining applications.
  • These various solutions have the drawback related to the presence of silicon at a relatively high content, namely a non-optimized spinnability, including a risk of burn during this operation, resulting in surface defects on the product. final.
  • the invention also relates to a turned part from the spun product as defined above.
  • the invention is based on the finding by the applicant that it is possible to obtain a very good bar turning ability, without addition of silicon to levels greater than or equal to 1.5%, unlike the prior art, ensuring the presence in sufficient amounts of intermetallic iron phases dispersed homogeneously.
  • This characteristic allows the chip fragmentation required for this purpose during the machining operation.
  • intermetallic phases are of the Al x Fe y (Mn, Ni) z Si v type , the presence of the Mn and Ni elements being optional because they provide a complement by creating particles that are also favorable to bar turning.
  • the single spun products that is to say of the type bars, rods or tubes, according to the invention, exhibit a behavior during bar turning similar to the products of the prior art made from AA6262 or AA2011 series alloys containing both lead and bismuth.
  • the alloy 6xxx is according to the invention while the alloys AA6262 and H Si are alloys of the prior art, the former containing lead and bismuth, the second, devoid of these elements, coupling a high silicon content to the presence of manganese and magnesium.
  • the pions were then homogenized at a temperature of 545 ° C. for 5 h 30 min.
  • Billet diameters of 29.6 mm and length 38 mm were machined and spun into bars of 6.7 mm diameter. The spinning was carried out under the same conditions of billet temperature of 480 ° C and speed of 0.6 m / min. This relatively low speed results from a similarity operation because of the size of the test samples compared with industrial conditions.
  • the figure 1 represents the spinning pressures of each variant for the same length of billet.
  • the variant according to the invention has a better spinnability resulting in a lower pressure of about 20% relative to the reference AA6262 and about 10% relative to the reference H Si.
  • the spun bars were heat-treated, type T6, dissolving at a temperature of 560 ° C for 15 minutes, water quenching and tempering. to obtain the maximum mechanical strength, also known to those skilled in the art under the name of "peak income", ie 10 h at 175 ° C for the alloys 6xxx according to the invention and H Si and 10 h to 160 ° C for alloy AA6262.
  • the mechanical resistance characteristics Rp 0.2 and Rm of the alloy according to the invention are very close to those of alloy AA6262 and slightly inferior to those of the alloy H Si, with elongations at break of the same order. In any case, they are much larger than the typical minimum values, with an extension of the same order.
  • the microstructure of the variant according to the invention was studied by scanning electron microscopy in order to determine the nature, the dispersion and the size of the intermetallic phases at the micrometric scale. It revealed the majority presence of a phase of the AlFeNiSi type in the form of particles having an average size of 3 ⁇ m with a surface fraction of 5%.
  • the Applicant attributes to the dispersion of this relatively large surface fraction fraction phase and in the form of relatively small particles the good bar-turning behavior with favorable fragmentation of the chips.
  • Machinability was characterized using the drilling test in accordance with NFE66-520-8.
  • the values of the cutting pressures for different resulting cutting and advancing speeds are reported in figures 2 and 3 .
  • the three variants have a stable operating range throughout the relatively large range of cutting speeds (from 10 to 140 m / min).
  • the AA6262 variant of the prior art requires a force of about 20% lower than the alloy according to the invention as well as with respect to the alloy H Si of the prior art also, this for a drilling advance constant of 0.15 mm / rev ( figure 2 ) and about 10% for a constant cutting speed of 55 m / min ( figure 3 ). Given the error levels associated with effort measurements, this difference, while significant, remains low and the behaviors of the different variants can be considered similar.
  • Chip fragmentation was scored according to the same European standard NFE66-520-8, from A.1, most favorable case, to D.6 worst case.
  • the marks awarded in the present case are: A.1: “Elementary-Fragmented Whistle”, B.6: “Short-Helical” and C.6: “Mid-Long-Helical", according to the said standard.
  • These notations were made for various drilling feed rates of 0.05 to 0.3 mm / rev and for the same cutting speed of 55 m / min.
  • Table 3 summarized in Table 3 below.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)

Claims (6)

  1. Strangpresserzeugnis aus einer zum Drehen geeigneten Aluminium-Knetlegierung mit der chemischen Zusammensetzung, ausgedrückt in Gew.-%:
    0.8 ≤ Si < 1.5 %
    1.0 < Fe ≤ 1.8 %
    Cu: < 0.1 %
    Mn: < 0.6 %
    Mg: 0.6 - 1.2 %
    Ni: < 3.0 %
    Cr: < 0.25 %
    Ti: < 0.1 %
    weitere Elemente jeweils < 0.05 % und insgesamt 0.15 %, Rest Aluminium.
  2. Strangpresserzeugnis nach Anspruch 1, dadurch gekennzeichnet, dass der Siliziumgehalt 1.0 % oder mehr beträgt.
  3. Strangpresserzeugnis nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der Eisengehalt mehr als 1.0 und bis zu 1.5 % beträgt.
  4. Strangpresserzeugnis nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Magnesiumgehalt zwischen 0.6 und 0.9 % liegt.
  5. Strangpresserzeugnis nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Nickelgehalt zwischen 1.0 und 2.0 % liegt.
  6. Drehteil hergestellt aus einem Strangpresserzeugnis nach einem der Ansprüche 1 bis 5.
EP10716375.0A 2009-04-03 2010-03-26 Automaten-aluminium-aa 6xxx legierung Active EP2421996B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0901631A FR2944029B1 (fr) 2009-04-03 2009-04-03 Alliage d'aluminium de decolletage de la serie aa 6xxx
PCT/FR2010/000262 WO2010112698A1 (fr) 2009-04-03 2010-03-26 Alliage d'aluminium de décolletage de la série aa 6xxx

Publications (2)

Publication Number Publication Date
EP2421996A1 EP2421996A1 (de) 2012-02-29
EP2421996B1 true EP2421996B1 (de) 2018-08-22

Family

ID=40910961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10716375.0A Active EP2421996B1 (de) 2009-04-03 2010-03-26 Automaten-aluminium-aa 6xxx legierung

Country Status (6)

Country Link
US (1) US20120121456A1 (de)
EP (1) EP2421996B1 (de)
ES (1) ES2695906T3 (de)
FR (1) FR2944029B1 (de)
RU (1) RU2522413C2 (de)
WO (1) WO2010112698A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2514555A1 (de) * 2011-04-21 2012-10-24 Aleris Aluminum Koblenz GmbH Rohrprodukt einer Extrusionsaluminiumlegierung
EP2664687B1 (de) * 2012-05-15 2015-07-08 Constellium Extrusions Decin s.r.o. Verbessertes, frei maschinell bearbeitbares Schmiede-Aluminiumlegierungsprodukt und Herstellungsverfahren davon
US20150030496A1 (en) * 2013-07-26 2015-01-29 M&C Corporation Aluminum alloy wire and wire assembly parts
RU2648339C2 (ru) * 2016-05-31 2018-03-23 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Проводниковый алюминиевый сплав и изделие из него
KR102578561B1 (ko) 2019-03-13 2023-09-15 노벨리스 인크. 시효-경화성 및 고 성형성 알루미늄 합금, 이로 제조된 모놀리식 시트 및 이를 포함하는 클래드 알루미늄 합금 제품

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223050A (en) * 1985-09-30 1993-06-29 Alcan International Limited Al-Mg-Si extrusion alloy
JPH0689430B2 (ja) * 1989-03-22 1994-11-09 三協アルミニウム工業株式会社 押出用グレー発色アルミニウム合金
US5167480A (en) * 1991-02-04 1992-12-01 Allied-Signal Inc. Rapidly solidified high temperature aluminum base alloy rivets
US5522950A (en) * 1993-03-22 1996-06-04 Aluminum Company Of America Substantially lead-free 6XXX aluminum alloy
JP3107517B2 (ja) * 1995-03-30 2000-11-13 株式会社神戸製鋼所 切削性に優れる高耐食アルミニウム合金押出材
NL1002861C2 (nl) * 1996-04-15 1997-10-17 Hoogovens Aluminium Nv Werkwijze voor het vervaardigen van een goed vervormbare aluminiumplaat.
JP3301919B2 (ja) * 1996-06-26 2002-07-15 株式会社神戸製鋼所 切粉分断性に優れたアルミニウム合金押出材
JP2001220638A (ja) * 2000-02-08 2001-08-14 Kobe Steel Ltd 表面品質に優れたアルミニウム合金およびその成分設計方法
JP2002206132A (ja) * 2001-11-27 2002-07-26 Kobe Steel Ltd 切削性に優れたアルミニウム合金押出材及びその製造方法
RU2215055C2 (ru) * 2001-12-17 2003-10-27 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" Сплав на основе алюминия и изделие, выполненное из него
RU2221891C1 (ru) * 2002-04-23 2004-01-20 Региональный общественный фонд содействия защите интеллектуальной собственности Сплав на основе алюминия, изделие из этого сплава и способ изготовления изделия
EP1737994A2 (de) * 2004-04-15 2007-01-03 Corus Aluminium N.V. Produkt aus automaten-alu-knetlegierung und verfahren zur herstellung eines solchen legierungsprodukts

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
EP2421996A1 (de) 2012-02-29
FR2944029A1 (fr) 2010-10-08
FR2944029B1 (fr) 2011-04-22
ES2695906T3 (es) 2019-01-11
WO2010112698A1 (fr) 2010-10-07
RU2522413C2 (ru) 2014-07-10
RU2011144509A (ru) 2013-05-10
US20120121456A1 (en) 2012-05-17

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