EP0759825B1 - Procede de fabrication de pieces coulees sous pression - Google Patents

Procede de fabrication de pieces coulees sous pression Download PDF

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Publication number
EP0759825B1
EP0759825B1 EP96908074A EP96908074A EP0759825B1 EP 0759825 B1 EP0759825 B1 EP 0759825B1 EP 96908074 A EP96908074 A EP 96908074A EP 96908074 A EP96908074 A EP 96908074A EP 0759825 B1 EP0759825 B1 EP 0759825B1
Authority
EP
European Patent Office
Prior art keywords
parting compound
parting
plunger
additives
additive
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
EP96908074A
Other languages
German (de)
English (en)
Other versions
EP0759825A1 (fr
Inventor
Jean-Pierre Gabathuler
Ivan GYÖNGYÖS
Hans-Günther THURNER
Jürgen Wüst
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.)
Magna BDW Technologies GmbH
Original Assignee
Magna BDW Technologies 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
Application filed by Magna BDW Technologies GmbH filed Critical Magna BDW Technologies GmbH
Priority to EP96908074A priority Critical patent/EP0759825B1/fr
Publication of EP0759825A1 publication Critical patent/EP0759825A1/fr
Application granted granted Critical
Publication of EP0759825B1 publication Critical patent/EP0759825B1/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
    • B22D17/20—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
    • B22D17/14—Machines with evacuated die cavity
    • 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
    • B22D17/2007—Methods or apparatus for cleaning or lubricating moulds

Definitions

  • the invention relates to a method for producing die-cast parts made of a light metal alloy.
  • Die casting process for the production of light metal parts for all types of industrial reuse, for example in the automotive industry or in device manufacturing have been special in recent years therefore have been further developed to large quantities to be able to manufacture inexpensively.
  • These include the so-called “Squeezecasting", in which a densification in the Form takes place, or the so-called developed by the applicant "MFT” method according to DE-OS 23 23 426 and DE-PS 30 02 886, which significantly evacuates the mold hollow body rapidly has improved. This made a faster firing order and a large throughput possible.
  • US Pat. No. 5,076,344 describes a method in which a Standard aluminum alloy in the molten state over one Riser pipe is filled into a casting chamber. From there the molten aluminum alloy with the help of a plunger an evacuated mold cavity and introduced into the casting chamber. In the mold cavity the concentration of the release agent is an alkali halide, 0.5 to 3 wt .-%, while in the Casting chamber the release agent, which is also used here as lubricant is used in a concentration of 2 to 7% by weight is present.
  • This method is preferred as a release agent an aqueous potassium iodide solution is used.
  • the release agent, that applied to the mold or to the plunger is prevented that the aluminum alloy on the walls of the Mold cavity or the plunger and the casting chamber stick remains. The release agent thus causes a continuous and trouble-free process flow.
  • alkali halides in particular Potassium iodide
  • this salt is the steel-containing device parts in which the method is carried out is corroded. Even the filling process, which is about a riser pipe is cumbersome.
  • Another Problem this method known from the prior art is that the quality of die casting by gas inclusions and others Contamination is reduced. The corrosion of the steel can lead to contamination in the metal alloy, since Detach corroded particles and particles from the steel surface can.
  • the processors of these light metal parts are now expecting them additionally improved material properties, such as higher Strength, lower weights, thin walls, complicated Geometry, further processability, such as weldability, heat treatability, or the possibility to use modern Connection technologies when installing and removing these parts.
  • the adverse effect of the alkali halides on the steel-containing parts of the process device can be reduced or avoided if the Release agent by adding corrosion-inhibiting additives bring a pH of at least 8. This has to Consequence that the process is continuous over a long period of time and can be carried out more effectively.
  • Additives are, for example, hexamethylenetetramine, to dicyclohexylamine nitrite or potassium hydroxide.
  • Hexamethylenetetramine and dicyclohexylamine nitrite are the release agents, such as indicated above, in a concentration of approximately 0.02 to 0.5 Vol .-% added, preferably in a concentration of 0.05 Vol .-% to 0.25 vol.%.
  • the Release agent in a further advantageous embodiment of the Invention additives added for stabilization.
  • a stabilizer is preferably sodium thiosulfate in a concentration from 0.01 to 0.5 vol.% added. This makes it clear Decreasing the quality of the release agent prevents what happens in turn affects the quality of the die-cast parts.
  • the release agent is preferred Sodium thiosulfate, which decomposes the release agent counteracts by UV radiation and / or organic additives, such as. Fungicides or bactericides that are responsible for formation counteract fungi or the like, added. So that is ensures long-term durability of the release agent according to the invention.
  • release agents can be used instead of alkali halides contain graphite dust.
  • Release agent Graphite bases were used 20 to 30 years ago. you However, use was made under the requirement of increased productivity, due to the heavy contamination of the casting device and the associated time-consuming cleaning and maintenance work more and more reduced. Object of the present invention However, as already mentioned, the procedure is not increased productivity, but increased quality of die casting. Taking this into account find the past improved graphite additives application. The improvement results in a smaller grain size of 1 - 1.5 ⁇ m, and the use of graphite additives in higher dilutions.
  • Another advantage of the method according to the invention is that the quality of the die casting by avoidance or reduction of the inclusions, for example, from cleavage products Release agents and lubricants arise, is improved. Thereby the ductility of the product is also significantly improved. This is significant improvement in die casting quality attributed to that used in the inventive method Vacuum is much higher than the vacuum that comes from known methods is used.
  • the vacuum according to the invention relates to a range below 50 mbar. This improved vacuum of the method according to the invention reached by the plunger an extension in the direction the piston movement axis. This extension causes at the exit of the piston on the side of the mold cavity one Sealing the casting chamber.
  • Casting chamber before filling the molten metal alloy heated so that pre-solidification is not possible in the first place is made of a material that has a low coefficient of thermal conductivity having. This is particularly useful here of ceramic materials.
  • the metal feed of the method according to the invention is also versus the feed known from the prior art is advantageous. While often in the prior art Vacural suction technology is used i.e. the metal supply over a riser pipe is carried out in the process according to the invention Metal using an ordinary ladle or dosing furnace introduced into the casting chamber. The use of a Ladle or a dosing oven is opposed to the use of a riser pipe is technically easier to handle.
  • the parts manufactured using the new process can do a lot be designed thin-walled and large area.
  • the good shaping properties leave the designer a great deal of freedom.
  • the lightweight material by saving weight.
  • the other requirements such as consistent quality series production, high ductility, weldability and thus also guaranteeing repairability. It will be too meets the conditions of crash safety.
  • Many types of joining techniques enable the combination with sheet metal or extruded profiles.
  • Lubricants are from the prior art known. However, hexamethylenetetramine and Dicyclohexylamine nitrite, each in a concentration of 0.02 up to 0.5 vol.% used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Lubricants (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (31)

  1. Procédé de fabrication de pièces coulées sous pression en alliage léger de métaux à concentration de fer limitée, l'alliage étant introduit à l'état liquide dans le conteneur d'une machine de coulée sous pression sous l'effet de la pesanteur, pour être ensuite envoyé au moyen d'un piston de compression dans une cavité du moule évacuée sous commande par rapport à la position du piston de compression, comprenant :
    Apport d'un agent de démoulage à base d'halogénure alcalin ou de graphite comme agent de démoulage sur au moins une moitié du moule, apport d'un lubrifiant sur le piston de compression,
    caractérisé en ce que
    l'alliage léger de métaux est un alliage primaire de composition constante avec une limitation des concentrations en Cu, Fe et Zn, subissant un traitement de fonte tel le dégazage et/ou le filtrage avant son introduction,
    le vide à l'intérieur de la cavité du moule se situe en dessous des 50 mbar au moment de l'introduction de l'alliage liquide, et
    que l'agent de démoulage est composé soit d'halogénure alcalin auquel sont ajoutés des additifs anti-corrosifs jusqu'à une valeur PH d'au moins 8, soit de poussière de graphite avec une dimension de particule située entre 1 et 1,5 µm.
  2. Procédé suivant la revendication 1,
    caractérisé en ce que
    le conteneur est réchauffé ou composé d'un matériau à coefficient de conductibilité thermique faible, par ex. de la céramique.
  3. Procédé suivant la revendication 1,
    caractérisé en ce que
    le piston de compression présente une prolongation dans le sens de l'axe de son mouvement provoquant l'obstruction du conteneur à l'endroit de la cavité du moule lors de l'extraction du piston et empêchant une aspiration d'air par l'ouverture d'alimentation du conteneur.
  4. Procédé suivant la revendication 1,
    caractérisé en ce que
    l'ouverture du conteneur présente un système de fermeture à orientation radiale par rapport au mouvement du piston.
  5. Procédé suivant la revendication 1,
    caractérisé en ce que
    le coupe transversale du conteneur présente une
    Figure 00230001
    forme de banane".
  6. Procédé suivant la revendication 1,
    caractérisé en ce que
    l'agent de démoulage utilisé est de l'iodure de potassium (0,5 - 5 %).
  7. Procédé suivant la revendication 1,
    caractérisé en ce que
    l'agent de démoulage comprend comme additif de l'hexaméthylène-tétramine à concentration d'env. 0,02 à 0,5 % du volume.
  8. Procédé suivant la revendication 1,
    caractérisé en ce que
    l'agent de démoulage comprend comme additif du nitrite de dicyclohexylamine à concentration d'env. 0,02 à 0,5 % du volume.
  9. Procédé suivant la revendication 1,
    caractérisé en ce que
    l'agent de démoulage présente de l'hydroxyde de potassium comme additif.
  10. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que
    des additifs sont ajoutés comme stabilisateurs à l'agent de démoulage.
  11. Procédé suivant la revendication 10,
    caractérisé en ce que
    que du thiosulfate de sodium est utilisé comme additif stabilisateur de l'agent de démoulage.
  12. Procédé suivant la revendication 11,
    caractérisé en ce que
    le thiosulfate de sodium est ajouté à une concentration de 0,01 à 0,5 % du volume.
  13. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que
    des additifs de conservation ou de traitement préservatif sont ajoutés à l'agent de démoulage.
  14. Procédé suivant la revendication 13,
    caractérisé en ce que
    du thiosulfate de sodium est ajouté à l'agent de démoulage comme additif de conservation ou de traitement préservatif.
  15. Procédé suivant la revendication 13,
    caractérisé en ce que
    un agrégat organique est ajouté à l'agent de démoulage comme additif de conservation ou de traitement préservatif.
  16. Procédé suivant la revendication 15,
    caractérisé en ce que
    des fongicides et/ou des bactéricides sont ajoutés en tant qu'additifs.
  17. Procédé suivant la revendication 1,
    caractérisé en ce que
    le lubrifiant présente de l'hexaméthylène-tétramine à une concentration de 0,02 à 0,5 % du volume.
  18. Procédé suivant la revendication 1,
    caractérisé en ce que
    le lubrifiant présente du nitrite de dicyclohexylamine à une concentration de 0,02 à 0,5 % du volume.
  19. Agent de démoulage pour l'utilisation dans un procédé de coulée sous pression suivant la revendication 1 contenant des halogénures alcalins en solution aqueuse, caractérisé en ce que
    l'agent de démoulage contient des additifs anti-corrosifs.
  20. Agent de démoulage suivant la revendication 19,
    caractérisé en ce que
    l'agent de démoulage est de l'iodure de potassium (0,5 - 5 %).
  21. Agent de démoulage suivant les revendications 19 ou 20,
    caractérisé en ce que
    l'agent de démoulage contient des additifs régulant la valeur PH.
  22. Agent de démoulage suivant la revendication 21,
    caractérisé en ce que
    l'agent de démoulage présente une valeur PH entre 8 et 9.
  23. Agent de démoulage suivant la revendication 19,
    caractérisé en ce que
    les additifs comprennent de l'hexaméthylène-tétramine ou du nitrite de dicyclohexylamine en une concentration de 0,02 à 0,5 % du volume.
  24. Agent de démoulage suivant la revendication 19,
    caractérisé en ce que
    l'additif est de l'hydroxyde de potassium.
  25. Agent de démoulage suivant l'une des revendications précédentes,
    caractérisé en ce que
    l'agent de démoulage contient des additifs de stabilisation de l'agent de démoulage.
  26. Agent de démoulage suivant la revendication 25,
    caractérisé en ce que
    l'additif de stabilisation de l'agent de démoulage est du thiosulfate de sodium.
  27. Agent de démoulage suivant la revendication 26,
    caractérisé en ce que
    l'agent de démoulage contient du thiosulfate de sodium en une concentration de 0,01 à 0,5 % du volume.
  28. Agent de démoulage suivant l'une des revendications précédentes,
    caractérisé en ce que
    l'agent de démoulage contient des additifs de conservation ou de traitement préservatif.
  29. Agent de démoulage suivant la revendication 28,
    caractérisé en ce que
    l'additif de conservation ou de traitement préservatif de l'agent de démoulage est du thiosulfate de sodium.
  30. Agent de démoulage suivant la revendication 28,
    caractérisé en ce que
    l'additif de conservation ou de traitement préservatif de l'agent de démoulage est un agrégat organique.
  31. Agent de démoulage suivant la revendication 30,
    caractérisé en ce que
    les additifs sont des fongicides et/ou des bactéricides.
EP96908074A 1995-03-20 1996-03-19 Procede de fabrication de pieces coulees sous pression Expired - Lifetime EP0759825B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96908074A EP0759825B1 (fr) 1995-03-20 1996-03-19 Procede de fabrication de pieces coulees sous pression

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP95104092 1995-03-20
EP95104092 1995-03-20
PCT/EP1996/001182 WO1996029165A1 (fr) 1995-03-20 1996-03-19 Moteur a flux transversal a aimant permanent et procede de fabrication correspondant
EP96908074A EP0759825B1 (fr) 1995-03-20 1996-03-19 Procede de fabrication de pieces coulees sous pression

Publications (2)

Publication Number Publication Date
EP0759825A1 EP0759825A1 (fr) 1997-03-05
EP0759825B1 true EP0759825B1 (fr) 1999-08-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96908074A Expired - Lifetime EP0759825B1 (fr) 1995-03-20 1996-03-19 Procede de fabrication de pieces coulees sous pression

Country Status (8)

Country Link
US (1) US6024158A (fr)
EP (1) EP0759825B1 (fr)
JP (1) JP4068139B2 (fr)
AT (1) ATE183422T1 (fr)
BR (1) BR9605884A (fr)
DE (1) DE59602781D1 (fr)
ES (1) ES2136980T3 (fr)
WO (1) WO1996029165A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3508627B2 (ja) * 1998-07-14 2004-03-22 日本軽金属株式会社 ダイカスト法及びダイカスト製品
EP1034863A1 (fr) * 1999-03-05 2000-09-13 Alusuisse Technology & Management AG Procédé pour la coulée sous pression de métaux légers
DE19945461A1 (de) * 1999-09-22 2001-04-19 Linde Gas Ag Verfahren zur Verbesserung des Magnesium-Druckgußprozesses
IT1317350B1 (it) * 2000-06-20 2003-06-16 Idra Presse S P A Struttura di iniettore particolarmente per impianto di pressofusionesottovuoto.
JP4481481B2 (ja) * 2000-12-13 2010-06-16 三和油化工業株式会社 ダイカスト用水性離型剤及びそれを用いたダイカスト鋳造法
US10316616B2 (en) 2004-05-28 2019-06-11 Schlumberger Technology Corporation Dissolvable bridge plug
JP2006187797A (ja) * 2005-01-07 2006-07-20 Asahi Organic Chem Ind Co Ltd 鋳型用塗型剤組成物及びそれを塗布せしめた鋳型
US8770261B2 (en) 2006-02-09 2014-07-08 Schlumberger Technology Corporation Methods of manufacturing degradable alloys and products made from degradable alloys
EP2336756A1 (fr) * 2009-12-15 2011-06-22 Nxp B.V. Capteur d'immersion de liquide

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Publication number Priority date Publication date Assignee Title
US2045913A (en) * 1933-08-28 1936-06-30 Dow Chemical Co Casting light metal
US3008202A (en) * 1960-04-25 1961-11-14 Nat Lead Co Vacuum system for cold chamber die-casting machines
JPS5037138B2 (fr) * 1972-07-10 1975-12-01
DE2323426A1 (de) * 1973-05-09 1974-11-28 Thurner Bayer Druckguss Absaugvorrichtung zum gesteuerten entlueften und/oder evakuieren der formen von druckgiessmaschinen
SU772678A1 (ru) * 1979-04-13 1980-10-23 Предприятие П/Я А-1872 Покрытие дл прессформ
DE3002886A1 (de) * 1980-01-28 1981-07-30 Bayrisches Druckguß-Werk Thurner KG, 8015 Markt Schwaben Druckgiessmaschine und verfahren zum betrieb derselben
SU1235609A1 (ru) * 1982-01-14 1986-06-07 Lebedev Vladimir S Смазка дл пресс-форм
JPS59125255A (ja) * 1982-12-28 1984-07-19 Fuso Light Alloys Co Ltd ダイカスト法及びダイカスト機
CA1213121A (fr) * 1983-04-11 1986-10-28 Kenneth P. Zecman Bec de coulee en moule
JPS60137541A (ja) * 1983-12-24 1985-07-22 Yuji Sengoku ダイカストにおける潤滑及び冷却方法
JPS60203335A (ja) * 1984-03-26 1985-10-14 Honda Motor Co Ltd 離型剤の塗布方法
DE3760303D1 (en) * 1986-04-11 1989-08-17 Alusuisse Process and plant for pressure casting
DE3771957D1 (de) * 1986-06-27 1991-09-12 Alusuisse Lonza Services Ag Fuellbuechse fuer druckgiessmaschinen.
US5076344A (en) * 1989-03-07 1991-12-31 Aluminum Company Of America Die-casting process and equipment
US5076339B1 (en) * 1990-02-08 1998-06-09 J & S Chemical Corp Solid lubricant for die-casting process
JP2964369B2 (ja) * 1992-07-01 1999-10-18 日立粉末冶金株式会社 金型鋳造用離型剤

Also Published As

Publication number Publication date
DE59602781D1 (de) 1999-09-23
EP0759825A1 (fr) 1997-03-05
US6024158A (en) 2000-02-15
JPH10501745A (ja) 1998-02-17
JP4068139B2 (ja) 2008-03-26
BR9605884A (pt) 1997-09-16
ES2136980T3 (es) 1999-12-01
WO1996029165A1 (fr) 1996-09-26
ATE183422T1 (de) 1999-09-15

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