EP1442810B1 - Procédé pour la fabrication de fonte consistant en un alliage moulé par injection - Google Patents

Procédé pour la fabrication de fonte consistant en un alliage moulé par injection Download PDF

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Publication number
EP1442810B1
EP1442810B1 EP20040000321 EP04000321A EP1442810B1 EP 1442810 B1 EP1442810 B1 EP 1442810B1 EP 20040000321 EP20040000321 EP 20040000321 EP 04000321 A EP04000321 A EP 04000321A EP 1442810 B1 EP1442810 B1 EP 1442810B1
Authority
EP
European Patent Office
Prior art keywords
alloy
magnesium
temperature
supply opening
primary component
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
EP20040000321
Other languages
German (de)
English (en)
Other versions
EP1442810A1 (fr
Inventor
Peter Hutmann
Roland Treitler
Robert Prof. Dr. Singer
Mark Hartmann
Andreas Lohmüller
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.)
Bayerische Motoren Werke AG
Neue Materialien Fuerth GmbH
Original Assignee
Bayerische Motoren Werke AG
Neue Materialien Fuerth GmbH
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
Priority claimed from DE10301363A external-priority patent/DE10301363A1/de
Application filed by Bayerische Motoren Werke AG, Neue Materialien Fuerth GmbH filed Critical Bayerische Motoren Werke AG
Publication of EP1442810A1 publication Critical patent/EP1442810A1/fr
Application granted granted Critical
Publication of EP1442810B1 publication Critical patent/EP1442810B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2061—Means for forcing the molten metal into the die using screws

Definitions

  • the invention relates to a method for the production of castings from a Alloy by injection molding according to the preamble of Claim 1.
  • Such a method is already known (DE 199 07 118 C1).
  • This will be a particulate metallic Material, eg. B. a magnesium alloy containing the Main component forms and dendritic properties has, the material supply opening at the upstream Supplied to the end of the screw of a Thixospritzg tellmaschine, while the other metallic material, eg. As zinc or an AlZn alloy is fed downstream.
  • the screw extruder will use the magnesium alloy over it Solidus temperature heated so that they are in the storage zone in a thixotropic state is present. If a low melting metal such as zinc, the screw extruder the storage zone is fed, it melts, without having to the still solid magnesium alloy to mix homogeneously can. In addition, hardly manageable sealing problems at the point of zinc injection on.
  • Alloys are generally made by die casting.
  • the Alloy is used in the form of Giessmasseln, by conventional melt metallurgy from the Alloy components are obtained.
  • the desired alloy For die casting, the desired alloy must therefore be melted twice, once to Production of G cardmasseln and the other in the Pressure casting plant.
  • alloying elements In addition, problems arise through the compliance of the nominal alloy composition difficult or even is excluded. So is by the burning problem the Applicability of alloying elements limited, the one have high oxygen affinity, z. As Ca, Si, Hf, Y or Cerium. The same applies to alloying elements, which by their high vapor pressure tend to evaporate, z. Zn. Other alloying elements are limited or not at all Soluble in the base metal, allowing it to float or to Soil sink. So z.
  • the object of the invention is an easy to perform Process for the preparation of Castings from different alloys for To make available.
  • a commercially available Thixos injection molding machine used in the Screw conveys the material mixture to a storage zone, in the formed alloy with the screw, to it is formed axially displaceable back and forth, through the Nozzle ejected into the injection mold with the mold cavity becomes.
  • the housing of the Thixospritzg tellmaschine is through a heater, such as heaters, on the required temperature heats to the metallic At least partially melt materials.
  • the at least two particulate metallic ones Materials can be two different alloys or an alloy and a non-alloyed (pure) metal or two unalloyed (pure) metals.
  • a non-alloyed (pure) metal or two unalloyed (pure) metals can be used.
  • metals are also to understand semi-metals, such as boron or silicon.
  • the partially molten state that the alloy passes through Heating and shearing with the screw in the storage zone can be achieved that the as metallic material used alloy on a Temperature between the solidus and the liquidus temperature is heated, or if z.
  • the at least two metallic materials also completely be melted, d. H. as a metallic material
  • the alloy used can also be above the liquidus temperature heated, or when pure as a metallic material Unalloyed metals can be used, the metals also be completely melted.
  • the particulate materials called granules or Powders are used according to the invention as Mixture of the material supply opening in the housing of the Screw extruder at the upstream end of the screw fed.
  • a segregation in the reservoir can occur separate reservoir for the metallic materials used, from which the metallic materials of the Material supply opening in the housing of the extruder separated so be dosed that they only at the Mix the material supply port.
  • the at least two metallic particulate Materials preferably have a similar shape and Size distribution on. So should the middle one Particle diameter of one material from that of the other not more than 1: 5 to 5: 1 to deviate submissions.
  • the temperature of the screw extruder at the Fluid supply opening, d. H. the housing and the screw in this area, will feed at least two Alloys below the solidus temperature of the alloys, with supply of at least one alloy and at least a metal below the solidus temperature of the alloy and below the melting temperature of the metal and with supply of at least two metals below the melting temperature of the Held metals.
  • the solid mixture is homogeneous in Extruder distributed melted.
  • the temperature of the screw extruder can be determined by the Increase the fluid supply opening towards the nozzle. she can however, in front of the storage zone also higher than in the Be storage zone. Thus, the storage zone becomes preferable kept at a temperature that is optimal Spray temperature corresponds to, but also lower than the temperature for melting can be.
  • a metallic material provides the Main component and the at least other metallic Material is the minor component.
  • the main component can Be magnesium or a magnesium alloy, for. Eg AZ91, AM60 or AS41.
  • the first material that made up the main component is, can via a metering device, preferably a Dosing screw, the material supply opening of a Feeding hopper or the like reservoir supplied become.
  • the reservoir can this material be supplied for example with a suction conveyor.
  • the delivery characteristic of the dosing screw, d. H. of the Mass flow of this material as a function of the Screw speed must be used to determine the metered Quantity to be determined.
  • the second material so the minor component can z. B. act to a pure element.
  • the second material may also be from a hopper or the like Reservoir via a metering device, preferably a screw feeder or a chamber feeder, the Material supply to be supplied. The delivery characteristic This second metering device must also be determined become.
  • an inert gas which fed to the material supply port becomes, the admission of air into the screw extruder becomes prevented.
  • This can be done at the material supply opening Approach be provided, with an inert gas is provided to fill the approach with inert gas.
  • Inert gas is preferably used argon, as it is a higher density than air and thus the air from the Approach displaced.
  • Alloy elements are alloyed, the conventional melt metallurgical process to burn-off problems due to the high melting temperature and / or the high Oxygen affinity, for example calcium, Silicon, hafnium, yttrium and cerium.
  • the oxygen affinity of the alloyed metallic material may be larger than that of magnesium.
  • the oxygen affinity of a metal generally corresponds to its normal potential in the Voltage range.
  • Alloy elements alloyed with a normal potential in particular which is more negative than -2 volts
  • Alloy elements with a normal potential the more negative than that of magnesium (-2.37V), for example Calcium, hafnium, yttrium or cerium.
  • Alloy elements with a high melting point of more be alloyed as 1000 ° C, for example silicon.
  • alloying elements can be alloyed which, due to their high vapor pressure, tend to to evaporate, z.
  • sodium, potassium, zinc For example, zinc has B. a vapor pressure of about 100 mbar at 620 ° C and about 1000 mbar at 900 ° C.
  • alloying elements use that only limited or not at all in the Base metal are soluble, so they float or too Soil sink. So can magnesium as a base metal z.
  • alloying elements too soluble, with a high atomic weight, especially those with a much higher atomic weight than that Base metal can be used without a Gravity segregation occurs.
  • detectable phases or Structural constituents can according to the invention be single-phase (homogeneous) or multi-phase alloys arise.
  • the alloy with a lower Temperature can be supplied to the tool than when Die casting, the hot crack tendency and the tendency of the Alloy to stick, in particular by certain Alloy elements, such. As calcium is caused, reduced.
  • magnesium-based alloys without the in the melting metallurgy existing limitations following alloying elements as minor components be prepared: alkali and alkaline earth metals, z. B. Sodium, potassium, lithium, strontium, beryllium and calcium, Group 2B elements of the periodic table, such as zinc, the Group 3, such as boron, Group 3A, such as yttrium or the Lantanides such as cerium, group 4, such as silicon, the group 4A, such as titanium, zirconium or hafnium, group 5A, such as Vanadium, group 6A, such as chromium or molybdenum, as well as Ferrous metals, especially iron.
  • the one metallic material is the main component while the at least one other metallic material the Forms minor component.
  • the weight percentage of Main component is at least 50%, preferably 80% and more of the produced alloy.
  • the maximum temperature of the screw extruder is so set that they are used in an alloy as Main component above the solidus temperature, especially between the solidus and the Liquidus temperature of the alloy is and in a pure Metal as the main component above the melting point of Metal.
  • the main component has a Solidus temperature or a melting point, the below the solidus temperature or the melting point of at least one minor component lies.
  • the screw extruder on a Temperature above the solidus temperature or the Melting temperature of the main component is heated and thus the Secondary component dissolved in the main component. Due to the strong mixing in the screw extruder can According to the invention also with a refractory Minor component at a relatively low level Operating temperature of the screw extruder a homogeneous, single-phase melt can be obtained.
  • the material feed opening of a screw extruder with a dosing screw each 95 parts by weight of a Magnesium alloy AM60, as TIX06 quality granules and 5 parts by weight of zinc as spherical granules with a particle size of ⁇ 2 mm added.
  • the temperature the housing of the extruder was brieflyabissertig of the Feed opening set to a maximum of 620 °. there has been a obtained homogeneous single-phase melt, d. H. that had zinc in the liquid phase of the predominantly molten Magnesium alloy dissolved homogeneously.
  • Example 1 was repeated except that 90 Parts by weight of the magnesium alloy and 10 parts by weight Zinc were used. It also became a homogeneous one obtained single-phase alloy.
  • Example 1 was repeated except that 97 Parts by weight of the magnesium alloy and 3 parts by weight Calcium were used. It became a homogeneous single-phase Alloy obtained by high creep resistance distinguished.
  • the screw extruder then has in a housing 1 a Screw 2, which by a drive unit. 3 is driven. Further, an accumulator 4 provided by the screw 2 with a not Pistons are shown axially pushed back and forth can. In the drawing, the screw 2 is in position after the ejection of the alloy from the storage zone shown. When the snail is withdrawn, arises between her and the nozzle 5 the storage zone in which collect the alloy that flows through the nozzle 5 in the Mold cavity 6 of the tool 7 is ejected to the To form casting, not shown.
  • the housing 1 has at the upstream end of the Check 2 a material feed opening 8, which with a nozzle-shaped projection 9 is provided, which at its from the feed opening 8 facing away from the end is closed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)

Claims (10)

  1. Procédé de fabrication de pièces moulées à partir d'un alliage par moulage par injection, dans lequel au moins deux matériaux métalliques en forme de particules, de composition différente, qui sont constitués par au moins deux alliages ou par au moins un alliage et au moins un métal pur ou au moins par deux métaux purs, sont amenés à une extrudeuse à vis comportant un boítier (1) pourvu d'un chauffage (18) et d'une ouverture d'alimentation en matériau (8), à l'extrémité ascendante de convoyage de la vis (2), sont fondus au moins partiellement dans l'extrudeuse à vis et sont éjectés hors d'une zone d'accumulation via une filière (5), caractérisé en ce que les matériaux métalliques en forme de particules, de composition différente, sont dosés par des réservoirs (12, 14) séparés pour être amenés à ladite une ouverture d'alimentation en matériau (8) dans le boítier (1) de l'extrudeuse, telle sorte qu'ils se mélangent seulement au niveau de l'ouverture d'alimentation en matériau (8) et que la température de l'extrudeuse à vis au niveau de l'ouverture d'alimentation en matériau est maintenue en dessous du point de fusion dudit au moins un métal ou desdits au moins deux métaux ou en dessous de la température de solidus dudit au moins alliage ou desdits au moins deux alliages.
  2. Procédé selon la revendication 1, caractérisé en ce qu'un matériau métallique forme le composant principale et en ce qu'au moins un autre matériau métallique forme le composant secondaire.
  3. Procédé selon la revendication 2, caractérisé en ce qu'à l'état liquide jusqu'à 1000°C, le composant secondaire ne présente aucune solubilité dans le composant principal.
  4. Procédé selon la revendication 2, caractérisé en ce qu'à l'état liquide jusqu'à 1000°C, le composant secondaire présente dans le composant primaire une solubilité d'au maximum 10 % en poids.
  5. Procédé selon la revendication 2 ou 3, caractérisé en ce que le composant principal est du magnésium ou un alliage de magnésium.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'au moins un matériau métallique présente une plus grande affinité pour l'oxygène que le magnésium.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'à une température à laquelle le composant principal se trouve à l'état semi-liquide ou liquide, au moins un matériau métallique présente une pression de vaporisation supérieure au magnésium.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'au moins un des matériaux métalliques est un métal ou contient du métal, dont le poids atomique est au moins deux fois supérieur à celui du composant principal de l'alliage.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un gaz inerte (17) est amené à l'ouverture d'alimentation en matériau.
  10. Procédé selon la revendication 7, caractérisé en ce qu'à titre de gaz inerte, on utilise de l'argon.
EP20040000321 2003-01-14 2004-01-09 Procédé pour la fabrication de fonte consistant en un alliage moulé par injection Expired - Lifetime EP1442810B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10301081 2003-01-14
DE10301081 2003-01-14
DE10301363A DE10301363A1 (de) 2003-01-14 2003-01-16 Verfahren und Vorrichtung zur Herstellung von Gussstücken aus einer Legierung durch Spritzgießen
DE10301363 2003-01-16

Publications (2)

Publication Number Publication Date
EP1442810A1 EP1442810A1 (fr) 2004-08-04
EP1442810B1 true EP1442810B1 (fr) 2005-07-20

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EP20040000321 Expired - Lifetime EP1442810B1 (fr) 2003-01-14 2004-01-09 Procédé pour la fabrication de fonte consistant en un alliage moulé par injection

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EP (1) EP1442810B1 (fr)
DE (1) DE502004000022D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7694715B2 (en) 2007-01-23 2010-04-13 Husky Injection Molding Systems Ltd. Metal molding system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3273433B2 (ja) * 1995-06-29 2002-04-08 株式会社日本製鋼所 軽合金射出材料の射出成形方法および射出成形機
DE19907118C1 (de) * 1999-02-19 2000-05-25 Krauss Maffei Kunststofftech Spritzgießvorrichtung für metallische Werkstoffe
US6299665B1 (en) * 1999-07-06 2001-10-09 Thixomat, Inc. Activated feedstock
JP3495655B2 (ja) * 1999-08-30 2004-02-09 株式会社日本製鋼所 軽合金射出成形機の材料供給方法及びその装置
DE10135198A1 (de) * 2001-07-19 2003-02-06 Bayerische Motoren Werke Ag Verfahren und Vorrichtung zum Thixospritzgießen metallischen Materials und Anwendung des Verfahrens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7694715B2 (en) 2007-01-23 2010-04-13 Husky Injection Molding Systems Ltd. Metal molding system

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Publication number Publication date
DE502004000022D1 (de) 2005-08-25
EP1442810A1 (fr) 2004-08-04

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