EP1098009B2 - Verfahren zur Herstellung einer Aluminiumknetlegierung des Typs AlMgSi mit Sn und Mn - Google Patents

Verfahren zur Herstellung einer Aluminiumknetlegierung des Typs AlMgSi mit Sn und Mn Download PDF

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Publication number
EP1098009B2
EP1098009B2 EP00121632A EP00121632A EP1098009B2 EP 1098009 B2 EP1098009 B2 EP 1098009B2 EP 00121632 A EP00121632 A EP 00121632A EP 00121632 A EP00121632 A EP 00121632A EP 1098009 B2 EP1098009 B2 EP 1098009B2
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EP
European Patent Office
Prior art keywords
alloy
maximum
proportion
alloys
tin
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.)
Expired - Lifetime
Application number
EP00121632A
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German (de)
English (en)
French (fr)
Other versions
EP1098009B1 (de
EP1098009A2 (de
EP1098009A3 (de
Inventor
Joachim Dr. Becker
Gernot Dr.-Ing. Fischer
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.)
Otto Fuchs KG
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Otto Fuchs KG
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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
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • 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

Definitions

  • the invention relates to a method for producing an extruded article according to the preamble of claim 1.
  • Aluminum alloys of this type are used as high-performance machining materials, since they meet particularly high demands on machinability. It is therefore also referred to as a free-cutting alloy.
  • lead (Pb) in amounts of 2% or more is alloyed as alloying component.
  • a disadvantage of an addition of lead to achieve this desired property is the health risk posed by this element, in particular for those persons who work on such a workpiece.
  • the lead content has a negative effect on the creep behavior of the aluminum alloy, so that the workpieces or the products produced therefrom can only be used to a limited extent at relatively high temperatures.
  • Such machine alloys have become known.
  • the alloys described in these documents may contain, in addition to lead, further elements which favor further chip breaking: tin (Sn), bismuth (Bi), cadmium (Cd) or thallium (TI), which may be used alone or in a mixture with lead with proportions between 0 , 3 and 4 wt .-% may be involved in the construction of the alloy.
  • the metals copper (Cu), nickel (Ni) or zinc (Zn) are provided which are available in proportions of not more than 6, 4 or 10% by weight. may be included in the known alloys.
  • the generous dimensioning of the interval given in the aforementioned prior art, in which these alloy constituents can be present, makes it clear that in fact not inconsiderable proportions of these elements are needed or must be present in order to achieve the desired properties of the alloys described in these documents to be able to. Corresponding show the embodiments described in these documents. It should be noted that lead is basically a quite suitable element for achieving the desired machinability.
  • AlMgSi alloys which, instead of the element, contain lead in order to obtain the desired properties with regard to machinability of tin.
  • Such alloys are for example in US 5,810,952 A or in US 5,776,269 A described.
  • An additional component of these alloys besides tin is bismuth, which is used as an element to optimize the machinability.
  • copper contents between 0.3 and 0.4 wt .-% are alloyed.
  • the thermosetting alloy registered with the AA 6020 Aluminum Association copper is an essential ingredient for increasing strength. The copper content can be between 0.3 to 0.9 wt .-%. This alloy has a tin content between 0.9 and 1.5 wt .-%.
  • JP-A-07 197 163 discloses an Al alloy whose composition is 0.2-0.75 wt% Mg; 0.2-1.5% by weight of Si; 0.05-1.0% by weight of Cu; 0.01-1.0 wt% Sn; 0.005-0.20 wt% Ti; at least one of: 0.1-1.0 wt% Fe; 0.1-1.0% by weight of Mn; 0.05-0.3 wt.% Cr; Rest Al, contains.
  • the invention is therefore based on the object to propose an improved method for producing an article mentioned above.
  • the invention provides an aluminum wrought alloy which not only contains an unusually small amount - namely only 0.6 to 1.5% by weight - of a chip-promoting element and yet also has the same and in some cases even improved machining properties a single element as a chipping favoring element - contrary to the previously known proposals, in which in addition to this element other elements have been regularly alloyed - contains.
  • the use of tin as the only element that significantly promotes the chip breaking is harmless with regard to its environmental compatibility. Since in the prior art free-cutting alloys, several elements favoring machining were contained in larger proportions, it was not to be expected in the light of this state of the art that the alloy according to the invention would have such positive machining properties with the defined narrow proportion intervals of the elements used.
  • the claimed aluminum wrought alloy does not contain any admixtures of lead, bismuth or other heavy metals which had been incorporated into the previously known free-cutting alloys.
  • the inventors involved in the practice of this invention have found that it is precisely in the claimed intervals of the elements employed that phases are formed which greatly favor the machinability of an article made from such an alloy. For this, however, the inventors first had to break away from the prevailing doctrine.
  • tin is additionally used in addition to the constituents magnesium, silicon and manganese.
  • the use of bismuth and / or indium is just as unnecessary in the aluminum wrought alloy according to the invention for achieving the desired strengths as is the use of copper.
  • the alloy may also contain chromium at low levels.
  • the use of this additional alloy constituent in the context of its claimed proportions has a positive effect on the strength and the machinability of the aluminum wrought alloy. Higher levels, on the other hand, affect alloy properties.
  • titanium contents of up to 0.1% by weight may be included in the alloy. Titanium contents between 0.02 and 0.08% by weight are preferably used.
  • the aluminum wrought alloy has, compared to the previously known Aluminiumknetleg réelleen, during extrusion to a much larger temperature-related working window, so that with this Aluminiumknetleg réelle a solution annealing in the Preß locker can be done.
  • This property can not be removed from the prior art at any point.
  • the alloy according to the invention can be subjected to solution heat treatment in the heat of pressing, the articles produced by extrusion can be subjected to the stretching process in their full length and do not need to be cut into pieces suitable for solution heat treatment, as in the known prior art. Consequently, the number of non-usable stretchers in such a production process, as with the invention Alloy possible, significantly reduced.
  • the pressing temperature necessary for carrying out the extrusion process is considerably lower than that necessary for the previously known copper-containing aluminum wrought alloys.
  • the required pressing temperature is reduced by about 30-50 ° C compared to copper-containing AlMgSi alloys. Consequently, the temperature-related working window is larger, so that not only a solution annealing in the Preß locker can be done in a wider temperature range, but also makes a faster extrusion and extended quenching delay possible.
  • the targeted selection of the approved elements in the claimed weight fractions has resulted in an aluminum wrought AlMgSi alloy which not only has excellent machinability and strength properties, but which can also be processed particularly favorably, especially in extrusion molding.
  • the exclusion of copper as an alloying ingredient which is deliberately not integrated into the alloy and is only tolerated as an impurity, enables an extrusion product to be made by solution annealing in press heat and press quenching.
  • a free-cutting alloy which is not only particularly economical to manufacture but also to process.
  • the alloys "Stanal 32", “AA6020” and “KA62” have been made according to the so-called T6 method and the separate solution annealing step contained therein.
  • the other alloys have been prepared by the T5 process with a solution annealing in the heat of pressing. From the above comparison it is clear that the machining behavior of articles made of an alloy according to the invention is excellent and corresponds to that which could previously be achieved only with lead-containing AlMgSi alloys.
  • the copper-containing AlMgSi alloys have been subjected to a separate solution annealing step prior to the step of thermosetting to at least partially achieve the same cutting performance as an article made from an alloy according to the invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)
  • Conductive Materials (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Sliding-Contact Bearings (AREA)
  • Powder Metallurgy (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Materials For Medical Uses (AREA)
EP00121632A 1999-11-05 2000-10-04 Verfahren zur Herstellung einer Aluminiumknetlegierung des Typs AlMgSi mit Sn und Mn Expired - Lifetime EP1098009B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19953212 1999-11-05
DE19953212A DE19953212A1 (de) 1999-11-05 1999-11-05 Aluminiumknetlegierung

Publications (4)

Publication Number Publication Date
EP1098009A2 EP1098009A2 (de) 2001-05-09
EP1098009A3 EP1098009A3 (de) 2001-05-30
EP1098009B1 EP1098009B1 (de) 2002-07-03
EP1098009B2 true EP1098009B2 (de) 2008-09-24

Family

ID=7927977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00121632A Expired - Lifetime EP1098009B2 (de) 1999-11-05 2000-10-04 Verfahren zur Herstellung einer Aluminiumknetlegierung des Typs AlMgSi mit Sn und Mn

Country Status (8)

Country Link
EP (1) EP1098009B2 (pt)
JP (1) JP2001181770A (pt)
KR (1) KR100512154B1 (pt)
AT (1) ATE220122T1 (pt)
AU (1) AU6966400A (pt)
DE (2) DE19953212A1 (pt)
ES (1) ES2178998T3 (pt)
PT (1) PT1098009E (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100099554A (ko) * 2009-03-03 2010-09-13 현대모비스 주식회사 고가공성을 갖는 Ａｌ―ＳⅰＭｇ계 알루미늄 합금 및 그의 제조방법
KR101103290B1 (ko) * 2011-09-29 2012-01-11 주식회사동양강철 강도와 가공성이 우수한 압출 성형용 알루미늄 합금
KR20140061166A (ko) * 2012-11-13 2014-05-21 현대모비스 주식회사 고가공성을 갖는 AlMgSi계 알루미늄 합금, 그의 제조 방법 및 이로부터 제조된 자동차 부품

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996008586A1 (en) † 1994-09-16 1996-03-21 Aluminum Company Of America Lead-free 6xxx aluminum alloy
WO2000037697A1 (en) † 1998-12-22 2000-06-29 Impol, Industrija Metalnih Polizdelkov, D.D. Aluminum free-cutting alloy, processes for the production thereo f and use thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR977514A (fr) * 1942-07-30 1951-04-02 Alais & Froges & Camarque Cie Alliage pour le décolletage et l'estampage
CH239996A (fr) * 1942-07-30 1945-11-30 Alais & Froges & Camarque Cie Alliage d'aluminium, propre au décolletage et à l'estampage.
JP3684245B2 (ja) * 1993-11-24 2005-08-17 昭和電工株式会社 冷間鍛造用アルミニウム合金

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996008586A1 (en) † 1994-09-16 1996-03-21 Aluminum Company Of America Lead-free 6xxx aluminum alloy
WO2000037697A1 (en) † 1998-12-22 2000-06-29 Impol, Industrija Metalnih Polizdelkov, D.D. Aluminum free-cutting alloy, processes for the production thereo f and use thereof

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Research Disclosure", Nummer 39777, Mai 1997, S. 348 und Index, veröffentlicht von Hoogovens Aluminium NV †
Auftragbestätigung von Niagara Leadfree vom 26/08/96, Order-Nr. 19669-03, (Position 3: Alu Rod 6012 (Sn instead of Pb) T9 ASTM B211) und Hersteller-Zertifikat (mill certificate) für Nr. 19669-03, erstellt am 20.08.1996 †
Hatch J. E., "ALUMINUM, Properties and Physical Metallurgy", American Society for Metals, 5. Auflage, Januar 1993, S. 137 †

Also Published As

Publication number Publication date
EP1098009B1 (de) 2002-07-03
DE50000260D1 (de) 2002-08-08
EP1098009A2 (de) 2001-05-09
KR100512154B1 (ko) 2005-09-05
ATE220122T1 (de) 2002-07-15
EP1098009A3 (de) 2001-05-30
DE19953212A1 (de) 2001-05-31
PT1098009E (pt) 2002-11-29
KR20010070185A (ko) 2001-07-25
ES2178998T3 (es) 2003-01-16
AU6966400A (en) 2001-05-10
JP2001181770A (ja) 2001-07-03

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