EP3124632A1 - Aluminiumlegierung insbesondere für das giessen von tübbingschalungen für reifen und ein verfahren zur wärmebehandlung einer giessform segmente - Google Patents

Aluminiumlegierung insbesondere für das giessen von tübbingschalungen für reifen und ein verfahren zur wärmebehandlung einer giessform segmente Download PDF

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Publication number
EP3124632A1
EP3124632A1 EP16181626.9A EP16181626A EP3124632A1 EP 3124632 A1 EP3124632 A1 EP 3124632A1 EP 16181626 A EP16181626 A EP 16181626A EP 3124632 A1 EP3124632 A1 EP 3124632A1
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EP
European Patent Office
Prior art keywords
mass
heat treatment
max
temperature
mould segment
Prior art date
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Granted
Application number
EP16181626.9A
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English (en)
French (fr)
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EP3124632B1 (de
Inventor
Stefan MICHNA
Jaromir CAIS
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.)
Univerzita J E Purkyne V Usti Nad Labem
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Univerzita J E Purkyne V Usti Nad Labem
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    • 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
    • C22C21/04—Modified aluminium-silicon alloys
    • 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
    • C22F1/043—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 silicon as the next major constituent

Definitions

  • the invention concerns a newly developed aluminium alloy containing other alloying elements, in particular for the production of mould segment castings for pressing tyres for motor vehicles in the automotive industry.
  • aluminium alloys of the Al - Mg and Al - Si type are used for the production of metal moulds designed for tyre production.
  • the mould itself is composed of 8 to 36 segments, depending on the dimensions of the manufactured tyre.
  • the functional area of the mould itself is machined to the desired shape and dimensions by milling, turning and drilling.
  • the functional area of the mould is then treated with a coating of nanolayers in order to extend the time without cleaning the area and to extend the life of the mould.
  • the segment casting process is carried out using the low pressure casting technology, with the melt being kept at the casting temperature in a holding furnace for the entire period of casting.
  • the time between the first and the last casting process is about 4 hours, which brings with it a requirement for time stability of the melted alloy.
  • the tyres as such are manufactured by vulcanization of a mixture of organic substances at higher temperatures - 150 to 170 °C, but also at up to 220 °C. Thanks to the working temperature of the mould, is the alloy of the mould is required to possess stable mechanical properties under normal and increased temperature.
  • a significant disadvantage of the known aluminium alloys is that their mechanical properties decline very significantly at temperatures over 100 °C. Their mechanical properties can be increased by alloying them using suitable elements in combination with heat treatment with optimum parameters.
  • the alloy contains 85.55 to 89.00 % by mass of Al, 8.5 to 10.00 % by mass of Si, 0.6 to 1.2 % by mass of Cu, 0.6 to 1.0% by mass of Ni, 0.4 to 0.8 % by mass of Mn, 0.03 to 0.05 % by mass of Sr, max. 0.4 % by mass of Mg, max. 0.6 % by mass of Fe, max. 0.1 % by mass of Ti, max. 0.1 % by mass of Zn and max. 0.05 % by mass of other additives separately, with the total share of other additives being 0.15 % by mass at the maximum.
  • Another subject of the invention is a method of heat treatment of mould segment castings, wherein the mould segment castings are heated to an annealing temperature of 520 °C and annealed for 0.5 to 8 hours, after which they are cooled in water at a temperature of 50 to 60 °C and then subjected to ageing at a temperature of 170 °C for 6 to 8 hours.
  • This invention introduces a newly developed aluminium alloy in the mould production technology using low-pressure casting; thanks to the suggested heat treatment process, this alloy ensures stability of mechanical properties even at elevated temperatures.
  • the invented chemical composition of the alloy in combination with heat treatment results in an increased tensile strength compared to the currently used alloys of the Al-Si type - by 26 % at a temperature of 20 °C, by 30 % at a temperature of 170 °C and, compared to Al-Mg type alloys, by 49 % at a temperature of 20 °C and by 59 % at a temperature of 170 °C.
  • the essence of the invention is the suggested chemical composition of the newly developed Al-Si-Cu type alloy which guarantees high mechanical properties of the alloy for both normal and elevated temperatures thanks to the optimum content of alloying elements, together with the suggested heat treatment process.
  • the new alloy AlSi10CuNiMnSr with the chemical composition according to the present invention has high mechanical properties at normal and elevated temperatures of up to 250 °C.
  • the invention has been developed with a view to applying the new alloy in mould segment castings for the production of tyres where the mechanical properties are required to be stable even at elevated temperatures. Another requirement was the stability of mechanical properties of castings cast at the beginning and at the end of the casting process.
  • the invented alloy is alloyed with the following elements.
  • Silicon - main alloying element which significantly influences the casting properties - fluidity, and creates an intermetallic phase of Mg 2 Si, which enables the alloy to be hardened, together with an addition of Mg.
  • Copper - alloyed in order to increase the strength properties by curing thanks to the formation of an intermetallic phase of CuAl 2 .
  • Nickel - alloyed in order to increase the strength properties at higher temperatures and create a hardening phase of Al 6 Cu 3 Ni, reduce the thermal expansion coefficient and corrosion resistance.
  • Manganese - the purpose of alloying is to increase the strength properties, raise the temperature of recrystallization, refine the grain, suppress the negative effects of elimination of iron in a laminar form and create an intermetallic phase of ⁇ -AlFeMnSi.
  • Fig. 1 shows the microstructure of the inventive alloy.
  • Fig. 2 shows the intermetallic phases of ⁇ -AlFeMnSi.
  • Fig. 3 depicts the site of spot EDS analysis.
  • Fig. 4 shows the polycomponent intermetallic phase with an increased Ni content.
  • Fig. 5 shows the chemical spectrum of the detected elements of the polycomponent intermetallic phase with an increased Ni content.
  • the embodiment of the aluminium alloy for the production of mould segment castings for forming tyres for motor vehicles in the automotive industry contains 85.55 to 89.00 % by mass of Al, 8.5 to 10.00 % by mass of Si, 0.6 to 1.2 % by mass of Cu, 0.6 to 1.0 % by mass of Ni, 0.4 to 0.8 % by mass of Mn, 0.03 to 0.05 % by mass of Sr, max. 0.4 % by mass of Mg, max. 0.6 % by mass of Fe, max. 0.1 % by mass of Ti, max. 0.1 % by mass of Zn and max. 0.05 % by mass of other additives separately, with the total share of other additives being 0.15 % by mass at the maximum.
  • the alloy is modified without TiB vaccination.
  • the heat treatment process consists of a solution annealing process at a temperature of 520 °C, where the castings are loaded into the furnace at the ambient temperature and reach the annealing temperature together with the working space of the furnace.
  • the holding time at the annealing temperature depends on the wall thickness of the casting. This is followed by cooling in water at a temperature of 50-60 °C, depending on the dimensions and shape of the casting.
  • the last step in the heat treatment process is artificial ageing at a temperature of 170 °C; once again, the duration of this process is dependent on the dimensions of the casting. All parameters of the individual steps are summarized in Tab. 1.
  • the mechanical properties of the invented alloy were tested by static tensile tests and Brinell hardness measurement on samples made from mould segments after heat treatment as well as without any heat treatment.
  • Fig. 1 shows the microstructure of the invented alloy. It is formed by ⁇ -phase dendritic cells and by a eutectic mixture consisting of particles of separated eutectic silicon and the addition of strontium in the melt, as a modifier.
  • Fig. 2 shows an image of the intermetallic phase of ⁇ -AlFeMnSi taken by a scanning electron microscope. Subsequently, a spot EDS analysis was also performed on this phase. The site of the analysis is shown in Fig. 3 .
  • a polycomponent intermetallic phase with an increased content of nickel is created by adding nickel in the invented alloy - Fig. 4 .
  • the aluminium alloy according to the present invention can be particularly used in the production of mould segment castings for forming tyres for motor vehicles in the automotive industry.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Continuous Casting (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Body Structure For Vehicles (AREA)
  • Braking Arrangements (AREA)
  • Forging (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP16181626.9A 2015-07-28 2016-07-28 Aluminiumlegierung insbesondere für das giessen von tübbingschalungen für reifen und ein verfahren zur wärmebehandlung einer giessform segmente Active EP3124632B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2015-521A CZ2015521A3 (cs) 2015-07-28 2015-07-28 Hliníková slitina, zejména pro výrobu odlitků segmentů forem pro lisování pneumatik, a způsob tepelného zpracování odlitků segmentů forem

Publications (2)

Publication Number Publication Date
EP3124632A1 true EP3124632A1 (de) 2017-02-01
EP3124632B1 EP3124632B1 (de) 2017-11-08

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EP16181626.9A Active EP3124632B1 (de) 2015-07-28 2016-07-28 Aluminiumlegierung insbesondere für das giessen von tübbingschalungen für reifen und ein verfahren zur wärmebehandlung einer giessform segmente

Country Status (2)

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EP (1) EP3124632B1 (de)
CZ (1) CZ2015521A3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108486426A (zh) * 2018-03-20 2018-09-04 山东交通职业学院 发动机缸盖及铸造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1443122A1 (de) * 2003-01-23 2004-08-04 ALUMINIUM RHEINFELDEN GmbH Druckgusslegierung aus Aluminiumlegierung
DE102006032699A1 (de) * 2006-07-14 2008-01-17 Bdw Technologies Gmbh & Co. Kg Aluminiumlegierung und deren Verwendung für ein Gussbauteil insbesondere eines Kraftwagens
EP1972697A1 (de) * 2007-03-23 2008-09-24 Bridgestone Corporation Aluminiumlegierung in einer Form oder einem Reifen und Reifenform
EP2471967A1 (de) * 2010-12-28 2012-07-04 Casa Maristas Azterlan Verfahren zum Erhalt verbesserter mechanischer Eigenschaften in rezykliertem Aluminiumguss ohne plättchenförmige Betaphasen
US20120273154A1 (en) * 2011-04-04 2012-11-01 Williamson Warren G Aluminum alloy compositions and methods for die-casting thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19925666C1 (de) * 1999-06-04 2000-09-28 Vaw Motor Gmbh Zylinderkopf- und Motorblockgußteil
US20030143102A1 (en) * 2001-07-25 2003-07-31 Showa Denko K.K. Aluminum alloy excellent in cutting ability, aluminum alloy materials and manufacturing method thereof
US8758529B2 (en) * 2010-06-30 2014-06-24 GM Global Technology Operations LLC Cast aluminum alloys
DE102011083970A1 (de) * 2011-10-04 2013-04-04 Federal-Mogul Nürnberg GmbH Verfahren zur Herstellung eines Motorbauteils und Motorbauteil
JP6267317B2 (ja) * 2013-03-15 2018-01-24 ノベリス・インコーポレイテッドＮｏｖｅｌｉｓ Ｉｎｃ． ろう付け適用のためのクラッドシート合金
GB2522716B (en) * 2014-02-04 2016-09-14 Jbm Int Ltd Method of manufacture

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1443122A1 (de) * 2003-01-23 2004-08-04 ALUMINIUM RHEINFELDEN GmbH Druckgusslegierung aus Aluminiumlegierung
DE102006032699A1 (de) * 2006-07-14 2008-01-17 Bdw Technologies Gmbh & Co. Kg Aluminiumlegierung und deren Verwendung für ein Gussbauteil insbesondere eines Kraftwagens
EP1972697A1 (de) * 2007-03-23 2008-09-24 Bridgestone Corporation Aluminiumlegierung in einer Form oder einem Reifen und Reifenform
EP2471967A1 (de) * 2010-12-28 2012-07-04 Casa Maristas Azterlan Verfahren zum Erhalt verbesserter mechanischer Eigenschaften in rezykliertem Aluminiumguss ohne plättchenförmige Betaphasen
US20120273154A1 (en) * 2011-04-04 2012-11-01 Williamson Warren G Aluminum alloy compositions and methods for die-casting thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108486426A (zh) * 2018-03-20 2018-09-04 山东交通职业学院 发动机缸盖及铸造方法
CN108486426B (zh) * 2018-03-20 2019-11-15 山东交通职业学院 发动机缸盖及铸造方法

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Publication number Publication date
EP3124632B1 (de) 2017-11-08
CZ306352B6 (cs) 2016-12-14
CZ2015521A3 (cs) 2016-12-14

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