EP1093529A1 - Lead free aluminium alloy based on a mixture of aluminium-copper-magnesium with good machining capacity - Google Patents

Lead free aluminium alloy based on a mixture of aluminium-copper-magnesium with good machining capacity

Info

Publication number
EP1093529A1
EP1093529A1 EP99920526A EP99920526A EP1093529A1 EP 1093529 A1 EP1093529 A1 EP 1093529A1 EP 99920526 A EP99920526 A EP 99920526A EP 99920526 A EP99920526 A EP 99920526A EP 1093529 A1 EP1093529 A1 EP 1093529A1
Authority
EP
European Patent Office
Prior art keywords
max
aluminum alloy
alloy
tin
less
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.)
Ceased
Application number
EP99920526A
Other languages
German (de)
French (fr)
Inventor
Jiri Faltus
Karel Placek
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.)
3A Composites International AG
Original Assignee
Alusuisse Technology and Management Ltd
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 Alusuisse Technology and Management Ltd filed Critical Alusuisse Technology and Management Ltd
Priority to EP99920526A priority Critical patent/EP1093529A1/en
Publication of EP1093529A1 publication Critical patent/EP1093529A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C22F1/057—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 with copper 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
    • C22C21/003—Alloys based on aluminium containing at least 2.6% of one or more of the elements: tin, lead, antimony, bismuth, cadmium, and titanium
    • 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
    • C22C21/12—Alloys based on aluminium with copper 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
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/14—Alloys based on aluminium with copper 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
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium

Definitions

  • the invention relates to an aluminum alloy based on AICuMg with good machinability.
  • Wrought alloys based on AICuMg that are suitable as machine materials contain lead as a chip-breaking additive. According to EN 573: 1994 these alloys are designated with EN AW-AICu4PbMgMn (EN AW-2007) and EN AW-AICu4PbMg (EN AW-2030).
  • the invention is therefore based on the object of providing a lead-free aluminum alloy which is suitable as a machine material and has good machinability and which has comparable or better mechanical properties than known machine materials based on AICuMg.
  • the alloy contains 0.7 to 1.5% by weight of tin as a chip-breaking additive.
  • a preferred aluminum alloy contains in% by weight
  • the preferred range for tin is 0.8 to 1.3, especially 0.9 to 1.2% by weight.
  • the alloy preferably contains 0.15 to 0.25% by weight bismuth.
  • the alloy according to the invention can be processed in a known manner by continuous casting and extrusion.
  • the continuously cast ingots are usually subjected to a high-temperature anneal.
  • the extruded products are then transferred to various end states by heat treatment or thermomechanical processing.
  • the alloy according to the invention is particularly suitable for machining on machines.

Landscapes

  • 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)
  • Extrusion Of Metal (AREA)
  • Continuous Casting (AREA)

Abstract

The invention relates to an aluminium alloy based on a mixture of aluminium-copper-magnesium with good machining capacity and containing 0.7 to 1.5 % by weight of tin as chip-breaking additive. A preferred alloy contains, by weight, 3.9 to 5.2 % copper; 0.3 to 1.3 % magnesium; 0.3 to 1.0 % manganese; 0.7 to 1.5 % tin; less than 0.4 % bismuth; less than 0.8 % iron; less than 0.8 % silicon; less than 0.5 % zinc; less than 0.15 % chromium; less than 0.20 % titanium and less than 0.15 % in total of unavoidable additives, the balance being composed of aluminium. The tin used in this alloy enables to avoid use of harmful lead. The inventive alloy is particularly useful as a material for automatic devices.

Description

Bleifreie Aluminiumlegierung auf Basis AICuMg mit guter SpanbarkeitLead-free aluminum alloy based on AICuMg with good machinability
Die Erfindung betrifft eine Aluminiumlegierung auf Basis AICuMg mit guter Spanbarkeit.The invention relates to an aluminum alloy based on AICuMg with good machinability.
Als Automatenwerkstoffe geeignete Knetlegierungen auf Basis AICuMg enthalten als spanbrechenden Zusatz Blei. Gemass EN 573:1994 werden diese Legierungen mit EN AW-AICu4PbMgMn (EN AW-2007) und EN AW- AICu4PbMg (EN AW-2030) bezeichnet.Wrought alloys based on AICuMg that are suitable as machine materials contain lead as a chip-breaking additive. According to EN 573: 1994 these alloys are designated with EN AW-AICu4PbMgMn (EN AW-2007) and EN AW-AICu4PbMg (EN AW-2030).
Wegen der gesundheitsschädlichen Wirkung von Blei ist man gegenwärtig bemüht, dessen Anwendung in der Industrie auf ein Minimum zu beschränken. Hinzu kommt, dass die Anwesenheit von Blei in einer Aluminium-Knetlegierung bei üblichen Temperaturen zu einer Erhöhung der Rissanfälligkeit unter Dauerbelastung führt.Because of the harmful effects of lead, efforts are currently being made to keep its use in industry to a minimum. In addition, the presence of lead in a wrought aluminum alloy at normal temperatures leads to an increase in susceptibility to cracking under constant load.
Der Erfindung liegt daher die Aufgabe zugrunde, eine als Automatenwerkstoff geeignete bleifreie Aluminiumlegierung mit guter Spanbarkeit bereitzustellen, die gegenüber bekannten Automatenwerkstoffen auf Basis AICuMg vergleichbare oder bessere mechanische Eigenschaften aufweist.The invention is therefore based on the object of providing a lead-free aluminum alloy which is suitable as a machine material and has good machinability and which has comparable or better mechanical properties than known machine materials based on AICuMg.
Zur erfindungsgemässen Lösung der Aufgabe führt, dass die Legierung 0.7 bis 1.5 Gew.-% Zinn als spanbrechenden Zusatz enthält.To achieve the object according to the invention, the alloy contains 0.7 to 1.5% by weight of tin as a chip-breaking additive.
Eine bevorzugte Aluminiumlegierung enthält in Gew.-%A preferred aluminum alloy contains in% by weight
Kupfer 3.9 bis 5.2Copper 3.9 to 5.2
Magnesium 0.3 bis 1.3Magnesium 0.3 to 1.3
Mangan 0.3 bis 1.0 Zinn 0.7 bis 1.5Manganese 0.3 to 1.0 Tin 0.7 to 1.5
Wismut max. 0.40Bismuth max. 0.40
Eisen max. 0.8Iron max. 0.8
Silizium max. 0.8Silicon max. 0.8
Zink max. 0.5Zinc max. 0.5
Chrom max. 0.15Chrome max. 0.15
Titan max. 0.20 sowie unvermeidliche Begleitelemente einzeln max. 0.05, insgesamt max. 0.15 und Aluminium als Rest.Titanium max. 0.20 and unavoidable accompanying elements individually max. 0.05, total max. 0.15 and aluminum as the rest.
Der Vorzugsbereich für Zinn liegt bei 0.8 bis 1.3, insbesondere 0.9 bis 1.2 Gew.-%.The preferred range for tin is 0.8 to 1.3, especially 0.9 to 1.2% by weight.
Bevorzugt enthält die Legierung 0.15 bis 0.25 Gew.-% Wismut.The alloy preferably contains 0.15 to 0.25% by weight bismuth.
Die erfindungsgemässe Legierung kann in bekannter Art durch Stranggiessen und Strangpressen verarbeitet werden. Üblicherweise werden die stranggegossenen Barren einer Hochglühung unterworfen. Die stranggepressten Erzeugnisse werden sodann durch eine Wärmebehandlung oder thermomecha- nische Verarbeitung in verschiedene Endzustände überführt.The alloy according to the invention can be processed in a known manner by continuous casting and extrusion. The continuously cast ingots are usually subjected to a high-temperature anneal. The extruded products are then transferred to various end states by heat treatment or thermomechanical processing.
Für die erfindungsgemässe Legierung eignen sich zur Erzielung unterschiedlicher Auslagerungszustände die folgenden Wärmebehandlungsverfahren:The following heat treatment methods are suitable for the alloy according to the invention in order to achieve different aging conditions:
- Lösungsglühen mit nachfolgender Warmaushärtung- Solution annealing with subsequent heat curing
- Lösungsglühen, Abbau innerer Spannungen durch Recken in geeignetem Umfang mit nachfolgender Warmaushärtung- Solution annealing, reduction of internal stresses by stretching to a suitable extent with subsequent heat curing
- Lösungsglühen mit nachfolgender Kaltaushärtung während mindestens drei Tagen - Lösungsglühen, Abbau innerer Spannungen durch Recken in geeignetem Umfang mit nachfolgender Kaltaushärtung während mindestens drei Tagen Die erfindungsgemässe Legierung eignet sich besonders für die Bearbeitung auf Automaten.- Solution annealing with subsequent cold curing for at least three days - Solution annealing, relief of internal stresses by stretching to a suitable extent with subsequent cold curing for at least three days The alloy according to the invention is particularly suitable for machining on machines.
Die Erfindung wird nachstehend anhand von Ausführungsbeispielen näher erläutert.The invention is explained in more detail below on the basis of exemplary embodiments.
In einem Tiegelwiderstandsofen wurden zwei Legierungen mit einer Zusammensetzung gemass Tabelle 1 aus Aluminium 99.5, Magnesium 99.9, Zinn 99.95, Wismut 99.9 sowie Vorlegierungen AlCu 45, AIMnI O und AlTi 6 erschmolzen. Aus jeder Schmelzcharge wurden durch Stranggiessen mittels einer wassergekühlten Kokille aus einer Aluminiumlegierung unter Anwendung eines Schmiermittels Bolzen mit einem Durchmesser von 205 mm abgegossen. Nach dem Abdrehen auf einen Durchmesser von 185 mm wurden die Bolzen hochgeglüht. Nach dem Sägen auf geeignete Länge und Anwärmen in einem Induktionsofen wurden die Bolzen zu Stangen mit einem Durchmesser von 36 mm stranggepresst.Two alloys with a composition according to Table 1 made of aluminum 99.5, magnesium 99.9, tin 99.95, bismuth 99.9 and master alloys AlCu 45, AIMnI O and AlTi 6 were melted in a crucible resistance furnace. Bolts with a diameter of 205 mm were cast from each melt batch by continuous casting using a water-cooled mold made of an aluminum alloy using a lubricant. After turning to a diameter of 185 mm, the bolts were annealed. After sawing to a suitable length and heating in an induction furnace, the bolts were extruded into rods with a diameter of 36 mm.
Die auf diese Weise hergestellten Presslinge wurden durch unterschiedliche Wärmebehandlungsverfahren auf die gewünschten Endzustände verarbeitet. Die mechanischen Eigenschaften der erfindungsgemässen Legierungen sind in Tabelle 2 zusammengestellt.The compacts produced in this way were processed to the desired final states by different heat treatment processes. The mechanical properties of the alloys according to the invention are summarized in Table 2.
Tabelle 1Table 1
Tabelle 2 Table 2
Die in Tabelle 2 verwendeten Kurzbezeichnungen bedeuten:The short names used in Table 2 mean:
Rp 0.2 DehngrenzeRp 0.2 proof stress
Rm ZugfestigkeitRm tensile strength
A5 BruchdehnungA5 elongation at break
HB BrinellhärteHB Brinell hardness
*) EN 515 Aluminium und Aluminumlegierungen - Halbzeug - Bezeichnung der Werkstoffzustände *) EN 515 aluminum and aluminum alloys - semi-finished products - description of the material conditions

Claims

Patentansprüche claims
1. Aluminiumlegierung auf Basis AICuMg mit guter Spanbarkeit,1.AICuMg-based aluminum alloy with good machinability,
dadurch gekennzeichnet, dasscharacterized in that
die Legierung 0.7 bis 1.5 Gew.-% Zinn als spanbrechenden Zusatz enthält.the alloy contains 0.7 to 1.5% by weight of tin as a chip-breaking additive.
2. Aluminiumlegierung nach Anspruch 1 , dadurch gekennzeichnet, dass die Legierung in Gew.-%2. aluminum alloy according to claim 1, characterized in that the alloy in wt .-%
Kupfer 3.9 bis 5.2Copper 3.9 to 5.2
Magnesium 0.3 bis 1.3Magnesium 0.3 to 1.3
Mangan 0.3 bis 1.0Manganese 0.3 to 1.0
Zinn 0.7 bis 1.5Tin 0.7 to 1.5
Wismut max. 0.40Bismuth max. 0.40
Eisen max. 0.8Iron max. 0.8
Silizium max. 0.8Silicon max. 0.8
Zink max. 0.5Zinc max. 0.5
Chrom max. 0.15Chrome max. 0.15
Titan max. 0.20 sowie unvermeidliche Begleitelemente einzeln max. 0.05, insgesamt max. 0.15 und Aluminium als Rest enthält.Titanium max. 0.20 and unavoidable accompanying elements individually max. 0.05, total max. 0.15 and aluminum as the rest.
3. Aluminiumlegierung nach Anspruch 2, dadurch gekennzeichnet, dass die Legierung 0.8 bis 1.3 Gew.-%, vorzugsweise 0.9 bis 1.2 Gew.-% Zinn enthält.3. Aluminum alloy according to claim 2, characterized in that the alloy contains 0.8 to 1.3 wt .-%, preferably 0.9 to 1.2 wt .-% tin.
4. Aluminiumlegierung nach Anspruch 2, dadurch gekennzeichnet, dass die Legierung 0.15 bis 0.25 Gew.-% Wismut enthält. 4. Aluminum alloy according to claim 2, characterized in that the alloy contains 0.15 to 0.25 wt .-% bismuth.
5. Aluminiumlegierung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Legierung nach Stranggiessen, Hochglühen und Strangpressen mit nachfolgendem Lösungsglühen bzw. raschem Abkühlen aus der Presshitze, ggf. Recken, und nach Warmauslagern auf maximalen Aushärtungsgrad eine Zugfestigkeit von mindestens 420 MPa, eine Dehngrenze von mindestens 310 MPa, eine Brinellhärte von mindestems 115 sowie eine Bruchdehnung A5 von mindestens 9% aufweist.5. Aluminum alloy according to one of claims 1 to 4, characterized in that the alloy after continuous casting, annealing and extrusion with subsequent solution annealing or rapid cooling from the press heat, optionally stretching, and after hot aging to a maximum degree of hardening a tensile strength of at least 420 MPa , has a proof stress of at least 310 MPa, a Brinell hardness of at least 115 and an elongation at break A5 of at least 9%.
6. Aluminiumlegierung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Legierung nach Stranggiessen, Hochglühen und Strangpressen mit nachfolgendem Lösungsglühen bzw. raschem Abkühlen aus der Presshitze, ggf. Recken, und nach Kaltauslagern während mindestens drei Tagen eine Zugfestigkeit von mindestens 400 MPa, eine Dehngrenze von mindestens 290 MPa, eine Brinellhärte von mindestens 110 sowie eine Bruchdehnung A5 von mindestens 11 % aufweist.6. Aluminum alloy according to one of claims 1 to 4, characterized in that the alloy after continuous casting, annealing and extrusion with subsequent solution annealing or rapid cooling from the press heat, optionally stretching, and after cold aging for at least three days a tensile strength of at least 400 MPa, a proof stress of at least 290 MPa, a Brinell hardness of at least 110 and an elongation at break A5 of at least 11%.
7. Verwendung einer Aluminiumlegierung nach einem der Ansprüche 1 bis 6 für die Bearbeitung auf Automaten. 7. Use of an aluminum alloy according to one of claims 1 to 6 for machining on machines.
EP99920526A 1998-06-12 1999-05-28 Lead free aluminium alloy based on a mixture of aluminium-copper-magnesium with good machining capacity Ceased EP1093529A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99920526A EP1093529A1 (en) 1998-06-12 1999-05-28 Lead free aluminium alloy based on a mixture of aluminium-copper-magnesium with good machining capacity

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP98810537 1998-06-12
EP98810537A EP0964070A1 (en) 1998-06-12 1998-06-12 Lead free Aluminium alloy based on AlCuMg with good machinability
PCT/CH1999/000231 WO1999066090A1 (en) 1998-06-12 1999-05-28 Lead free aluminium alloy based on a mixture of aluminium-copper-magnesium with good machining capacity
EP99920526A EP1093529A1 (en) 1998-06-12 1999-05-28 Lead free aluminium alloy based on a mixture of aluminium-copper-magnesium with good machining capacity

Publications (1)

Publication Number Publication Date
EP1093529A1 true EP1093529A1 (en) 2001-04-25

Family

ID=8236133

Family Applications (2)

Application Number Title Priority Date Filing Date
EP98810537A Ceased EP0964070A1 (en) 1998-06-12 1998-06-12 Lead free Aluminium alloy based on AlCuMg with good machinability
EP99920526A Ceased EP1093529A1 (en) 1998-06-12 1999-05-28 Lead free aluminium alloy based on a mixture of aluminium-copper-magnesium with good machining capacity

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP98810537A Ceased EP0964070A1 (en) 1998-06-12 1998-06-12 Lead free Aluminium alloy based on AlCuMg with good machinability

Country Status (2)

Country Link
EP (2) EP0964070A1 (en)
WO (1) WO1999066090A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI20122A (en) 1998-12-22 2000-06-30 Impol, Industrija Metalnih Polizdelkov, D.D. Aluminium casting-automate alloy, process for its production and application
SI20694A (en) * 2000-09-04 2002-04-30 Impol, Industrija Metalnih Polizdelkov, D.D. Aluminium automatic diecast alloys, recycling process of their production and their use
CN106119629A (en) * 2016-08-25 2016-11-16 上海交通大学 Cutting free particle enhanced aluminum-based composite material and preparation method thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0797653A (en) * 1993-09-29 1995-04-11 Sumitomo Light Metal Ind Ltd Cast bar of free cutting aluminum alloy
US5587029A (en) * 1994-10-27 1996-12-24 Reynolds Metals Company Machineable aluminum alloys containing In and Sn and process for producing the same
US5776269A (en) * 1995-08-24 1998-07-07 Kaiser Aluminum & Chemical Corporation Lead-free 6000 series aluminum alloy
CZ286150B6 (en) * 1996-09-09 2000-01-12 Alusuisse Technology & Management Ag Aluminium alloy with excellent machinability
US5725694A (en) * 1996-11-25 1998-03-10 Reynolds Metals Company Free-machining aluminum alloy and method of use

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9966090A1 *

Also Published As

Publication number Publication date
EP0964070A1 (en) 1999-12-15
WO1999066090A1 (en) 1999-12-23

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