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EP0837747B1 - Noyau pour moules a couler - Google Patents

Noyau pour moules a couler Download PDF

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Publication number
EP0837747B1
EP0837747B1 EP96925659A EP96925659A EP0837747B1 EP 0837747 B1 EP0837747 B1 EP 0837747B1 EP 96925659 A EP96925659 A EP 96925659A EP 96925659 A EP96925659 A EP 96925659A EP 0837747 B1 EP0837747 B1 EP 0837747B1
Authority
EP
European Patent Office
Prior art keywords
casting
parts
casting core
weight
core
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
EP96925659A
Other languages
German (de)
English (en)
Other versions
EP0837747A1 (fr
Inventor
Roland Starck
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.)
Eichenauer Heizelemente GmbH and Co KG
Original Assignee
Fritz Eichenauer GmbH and Co KG
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 DE1995125307 external-priority patent/DE19525307C2/de
Application filed by Fritz Eichenauer GmbH and Co KG filed Critical Fritz Eichenauer GmbH and Co KG
Publication of EP0837747A1 publication Critical patent/EP0837747A1/fr
Application granted granted Critical
Publication of EP0837747B1 publication Critical patent/EP0837747B1/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
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/002—Removing cores by leaching, washing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/185—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents containing phosphates, phosphoric acids or its derivatives

Definitions

  • the invention relates to a casting core according to the preamble of claim 1 and a method of manufacturing a casting core according to the preamble of claim 9.
  • Such cores are known in core boxes using core shooters for series production manufactured.
  • the core boxes are with appropriate Provide mold cavities in which insertion openings flow out with a so-called shooting head Binding sand with the aid of Compressed air is injected into the mold cavities.
  • Core shooters are in terms of sizes and standardized the weight of the later castings in groups or divided.
  • core shooters developed core cores point about it also a classification in terms of capacities and Characteristic values for the so-called "shot volume" of the machine cycle times and the speed when changing the core box on.
  • Such machines are used to make cores made for molds that match those placed on them Surface finish requirements and Meet strength for the intended casting.
  • a liquid synthetic resin is generally used as a binder for the molding sand. Additives are also added. After this mixture has been shot into the core box, the core sand mixed with the binder is cured by gassing with CO 2 . After the casting cores have hardened, they are removed from the core box and a casting core ready for casting is available.
  • the disadvantage here is that annoying and harmful vapors such as formaldehyde or phenol occur during the gassing and venting of the casting cores. A partial burning of the binder during the casting process cannot be ruled out.
  • the molding sand is mixed with epoxy resin and again pressed in the core box as a molding compound as a molding compound.
  • fumigation then takes place, in which, instead of CO 2, gaseous amine hardeners are blown into the core box for curing. This then creates a casting core that can be used for casting metals.
  • the advantage of this is that no CO 2 is used for fumigation.
  • WO 94-A-14 455 shows a mold or a casting core Pouring sand as water-insoluble material, a binder, of the polyphosphate chains and / or borate ions and other fine particle material such as silica, silicates and aluminum silicates.
  • the manufacture of such Casting core is made by connecting the sand with the Binder, the substance with polyphosphate chains and / or Has borate ions and with small particle material Form silica, silicates or aluminum silicate in water the core and remove the water from the mixture by drying over 30 minutes.
  • Another disadvantage is long and / or energy-intensive drying in particular, that removing the core from the manufactured Casting mold takes a considerable amount of time.
  • US-A-4 081 283 proposes a gypsum form containing fibers with up to 70% plaster, up to 20% fibrous Wollastonite, up to 25% perlite and up to 40% other Filling materials.
  • the disadvantage is that due to the poor water solubility of the plaster none (indoor) Cores, but only outer shapes that are possible after Manufacture and hardening of the casting removed core Need to become. Reuse of the form is due the mixture of different materials and excluded their intimate connection and the forms therefore polluting the environment.
  • the invention has for its object a casting core to create of the type mentioned, avoiding the aforementioned disadvantages, especially after manufacture of the workpiece to be cast quickly from it can be removed and the desiccant in easier Way can be recycled.
  • the invention is also based on the object of a method to specify for the production of such a casting core.
  • this object is achieved by a Generic casting core with the characteristic features of claim 1 and by a generic method to manufacture such a casting core with the characteristic Features of claim 9 solved.
  • the casting core after casting the casting when immersed in water spontaneously its strength and becomes from the The casting is simply washed out.
  • the casting core can also be used to manufacture more complicated Parts like intake spindles, previously in two parts manufactured and connected by welding, as well Intake manifolds are used.
  • the instantized sodium hexametaphosphate used as a binder has a loose structure, which has good shelf life as well as lump-free Solubility guaranteed at high dissolving speed. Furthermore, instantized sodium hexametaphosphate the high demands on casting cores for casting molds just. When using instantized sodium hexametaphosphate for hardening the casting cores for casting molds is, on the one hand, immediate and quick redissolving given in water at normal temperature, on the other hand, such a binder can be used in the manufacturing process harmless with regard to health concerns be used because in the manufacture and processing the casting cores are not annoying or harmful to health Evaporation occurs. Otherwise find Sodium hexametaphosphate in the food industry use in larger quantities.
  • An essential one Advantage of instantized sodium hexametaphosphate lies in the fact that it already with a low moisture content an optimal mixing of the binder with the Dry substance, here sand, lead and a sufficient Initial strength of the casting core or mold guarantee. This or these can therefore after mixing formed of its components and in particular in With regard to the low moisture content with extreme low energy consumption in a very short time by a few Minutes, especially in 1 to 2 minutes, so far dried be made that the casting process can.
  • the drying time is therefore of the order of magnitude the casting time or core shot time, so that the production the casting cores or molds optimally in the entire production size the castings can be integrated.
  • the casting core has the greatest possible time saving prefers a high rate of decay so that significant time savings and thus also cost savings both in the manufacture of the Castings as well as in the recovery of the dry matter results.
  • While the desiccant is conventional used molding sand can also be used possible from Perlite.
  • Perlite is an inflated volcanic rock, which is particularly useful for Production of water-soluble casting cores for casting molds for the production of pressure-free cast thermoplastic Plastic prefabricated parts is suitable. So far Manufacture of such finished parts aluminum tools used, which is available in large numbers must be and also one that should not be underestimated Represent cost factor, while inexpensive Perlite again each time to produce a needed Kernes can be used. Also, due to the Water solubility in turn made complicated castings be so that welding after manufacture can be avoided.
  • One made from molding sand and sodium hexametaphosphate Casting core is particularly suitable for the production of Aluminum castings, while one made of pearlite and sodium hexametaphosphate manufactured casting core in particular for Production of plastic prefabricated parts is suitable because the casting temperatures here are not as high as with aluminum casting are. This is particularly advantageous because Perlite are less expensive than molding sand.
  • Casting cores produced in this way have a temperature resistance in a range between 600 and 1100 ° C and can be used for casting molds for the production of cast aluminum as well as pressure-free cast thermoplastic Plastic parts and used for polyurethane processing become.
  • the core boxes are only for hardening the cores drying at a temperature between 50 to maximum 100 ° C necessary. An unpleasant smell and Outgassing causing air pollution as with State of the art is no longer required.
  • a mixing ratio of 3 to 7 parts by weight of sodium hexametaphosphate and 0.5 to 2 parts by weight of water per 100 parts by weight of molding sand has proven to be advantageous when using molding sand and sodium hexametaphosphate.
  • perlite and sodium hexametaphosphate the addition of 25 to 30 parts by weight of sodium hexametashosphate and 30 to 40 parts by weight of water per 100 parts by weight of perlite has been found to be advantageous.
  • phosphoric acid perlite is added to produce the casting core, an addition of 65 to 75 or 70 to 80 parts by weight of phosphoric acid per 100 parts by weight of perlite is advantageous.
  • composition of the mixture Desiccant and binder specified for the casting core are provided below.
  • Example 2 shows 2 a less expensive manufacturing solution of casting cores for casting molds for pressure-free casting of precast thermoplastic parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (15)

  1. Noyau pour moules de fonderie réalisé dans un matériau dessiccateur renforcé au moyen d'un liant à base de polyphosphates, caractérisé en ce que le -liant est constitué par de l'hexamétaphosphate de sodium instantisé et en ce que le noyau (4) terminé perd sa forme sous l'effet de l'eau.
  2. Noyau selon la revendication 1, caractérisé en ce que le noyau (4) présente une vitesse de désagrégation élevée.
  3. Noyau selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le matériau dessiccateur (12) est du sable de moulage.
  4. Noyau selon la revendication 3, caractérisé par un rapport de mélange de 3 à 7 parties pondérales d'hexamétaphosphate de sodium instantisé et de 0,5 à 2 parties pondérales d'eau pour 100 parties pondérales de sable de moulage.
  5. Noyau selon l'une quelconque des revendications 1 à 2, caractérisé en ce que le matériau dessiccateur (12) est de la perlite.
  6. Noyau selon la revendication 5, caractérisé par un rapport de mélange de 25 à 30 parties pondérales d'hexamétaphosphate de sodium instantisé et de 30 à 40 parties pondérales d'eau pour 100 parties pondérales de perlite.
  7. Noyau selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le noyau (4) est séché à une température comprise entre 50 et 100°C au maximum.
  8. Noyau selon la revendication 7, caractérisé en ce que le noyau (4) est séché à une température inférieure à 100°C.
  9. Procédé de fabrication d'un noyau réalisé dans un matériau dessiccateur renforcé par un liant à base de polyphosphates, caractérisé en ce que l'on mélange le matériau dessiccateur avec de l'hexamétaphosphate de sodium instantisé et de l'eau, en ce que le noyau est formé et ensuite séché.
  10. Procédé selon la revendication 9, caractérisé en ce que comme matériau dessiccateur on mélange du sable de moulage avec de l'hexamétaphosphate de sodium instantisé et de l'eau.
  11. Procédé selon la revendication 10, caractérisé en ce que l'on mélange de 3 à 7 parties pondérales d'hexamétaphosphate de sodium instantisé et 0,5 à 2 parties pondérales d'eau à 100 parties pondérales de sable de moulage.
  12. Procédé selon la revendication 9, caractérisé en ce que comme matériau dessiccateur on mélange de la perlite avec de l'hexamétaphosphate de sodium instantisé et de l'eau.
  13. Procédé selon la revendication 12, caractérisé en ce que l'on mélange de 25 à 30 parties pondérales d'hexamétaphosphate de sodium instantisé et 30 à 40 parties pondérales d'eau à 100 parties pondérales de perlite.
  14. Procédé selon l'une quelconque des revendications 9 à 13, caractérisé en ce que le noyau est séché à une température comprise entre 50 et 100°C au maximum.
  15. Procédé selon la revendication 14, caractérisé en ce que le noyau est séché à une température inférieure à 100°C.
EP96925659A 1995-07-12 1996-07-04 Noyau pour moules a couler Expired - Lifetime EP0837747B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1995125307 DE19525307C2 (de) 1995-07-12 1995-07-12 Formmasse zur Herstellung von Gießkernen und Verfahren zur Herstellung eines Gießkerns
DE19525307 1995-07-12
PCT/EP1996/002947 WO1997002913A1 (fr) 1995-07-12 1996-07-04 Noyau pour moules a couler

Publications (2)

Publication Number Publication Date
EP0837747A1 EP0837747A1 (fr) 1998-04-29
EP0837747B1 true EP0837747B1 (fr) 2003-04-02

Family

ID=7766584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96925659A Expired - Lifetime EP0837747B1 (fr) 1995-07-12 1996-07-04 Noyau pour moules a couler

Country Status (5)

Country Link
EP (1) EP0837747B1 (fr)
DE (2) DE19549469C2 (fr)
ES (1) ES2192228T3 (fr)
PT (1) PT837747E (fr)
WO (1) WO1997002913A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10141633A1 (de) * 2001-08-24 2003-03-13 Eichenauer Gmbh & Co Kg F Verfahren und Vorrichtung zum Entkernen wasserlöslicher Gießkerne
DE10226817C1 (de) * 2002-06-15 2003-11-13 Eichenauer Gmbh & Co Kg F Giessform und Verfahren zu deren Herstellung
DE10227512B4 (de) * 2002-06-19 2004-07-08 Georg Fischer Gmbh & Co.Kg Verfahren zur Herstellung von Giesskernen oder Formen, sowie nach diesem Verfahren hergestellte Giesskerne oder Formen
DE102005031212B4 (de) * 2005-07-01 2007-11-08 Daimlerchrysler Ag Zerstörbarer Formkern für den metallischen Guss, Herstellverfahren, Urform und Verwendung
ES2303161T3 (es) 2005-08-13 2008-08-01 Georg Fischer Automobilguss Gmbh Procedimiento para la produccion de machos de colada o moldes.
DE102007009776A1 (de) 2007-02-27 2008-08-28 Fritz Winter Eisengiesserei Gmbh & Co. Kg Verfahren und Vorrichtung zum Bearbeiten von Gießformteilen
DE102008009092B3 (de) * 2008-02-14 2009-05-20 Eisenwerk Hasenclever & Sohn Gmbh Verfahren zur Herstellung von eine komplexe Geometrie aufweisenden Kernen für Gießereizwecke

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751482A (en) * 1927-06-20 1930-03-25 Emil L Leasman Core and process of forming the same
BE508327A (fr) * 1951-01-09
US2930709A (en) * 1958-01-02 1960-03-29 Steel Founders Soc Of America Inorganic bonded cores for steel castings
NO118158B (fr) * 1965-10-22 1969-11-17 Mitsubishi Heavy Ind Ltd
US4081283A (en) * 1976-02-23 1978-03-28 Pmcma Research Group Plaster molding composition
SU565774A1 (ru) * 1976-03-24 1977-07-25 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения Нииптмаш Теплоизол ционна смесь дл прибылей стальных отливок
JPS5314120A (en) * 1976-07-26 1978-02-08 Nat Res Inst Metals Method to manufacture waterrsoluble selffcuring casting mould
SU942858A1 (ru) * 1979-07-19 1982-07-15 Научно-Производственное Объединение По Технологии Машиностроения "Цниитмаш" Самотвердеюща смесь дл изготовлени литейных форм и стержней
JPS6437477A (en) * 1987-07-31 1989-02-08 Nippon Steel Chemical Co Refractory lightweight set material
GB9022754D0 (en) * 1990-10-19 1990-12-05 Pilkington Controlled Release Improvements in or relating to water dispersible moulds
US5273104A (en) * 1991-09-20 1993-12-28 United Technologies Corporation Process for making cores used in investment casting
GB9226815D0 (en) * 1992-12-23 1993-02-17 Borden Uk Ltd Improvements in or relating to water dispersible moulds

Also Published As

Publication number Publication date
DE59610306D1 (de) 2003-05-08
DE19549469C2 (de) 1999-05-12
WO1997002913A1 (fr) 1997-01-30
EP0837747A1 (fr) 1998-04-29
DE19549469A1 (de) 1997-06-12
PT837747E (pt) 2003-08-29
ES2192228T3 (es) 2003-10-01

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