WO2009140775A1 - Procédé de fabrication de noyaux - Google Patents

Procédé de fabrication de noyaux Download PDF

Info

Publication number
WO2009140775A1
WO2009140775A1 PCT/CH2009/000098 CH2009000098W WO2009140775A1 WO 2009140775 A1 WO2009140775 A1 WO 2009140775A1 CH 2009000098 W CH2009000098 W CH 2009000098W WO 2009140775 A1 WO2009140775 A1 WO 2009140775A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
casting
cores
lost
mold
Prior art date
Application number
PCT/CH2009/000098
Other languages
German (de)
English (en)
Inventor
Bernhard Fritsche
Sascha Padovan
Benjamin Hübsch
Original Assignee
Bühler Druckguss AG
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 DE102008001941A external-priority patent/DE102008001941A1/de
Application filed by Bühler Druckguss AG filed Critical Bühler Druckguss AG
Publication of WO2009140775A1 publication Critical patent/WO2009140775A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/108—Installation of cores

Definitions

  • the invention relates to a method for the production of cores, in particular but not exclusively for the production of lost cores, which are used in molds on pressure casting machines for casting light metal materials.
  • sliders also reduces productivity because additional movements of the slider must be completed before the casting can be ejected from the mold.
  • Certain components such as pump housings, tubular bodies and other geometries with pronounced or complex cavities, must be manufactured in shell construction.
  • two or more components (shells) of the component are poured, which are then joined together by various joining methods such as gluing, pressing, riveting or welding to the finished component.
  • the molded steels from which permanent molds are made are subject to wear due to temperature changes, cavitation, erosion and corrosion. These wear parts must be replaced at great cost from time to time.
  • lost cores such as, for example, salt cores
  • such cores are produced by mixing a granular salt with a phosphate-containing binder and subsequent shaping in a mold.
  • EP-A-1293276 the core is connected to an insert and in USP 5165464 it is disclosed to overmould a metal core with a salt mantle.
  • DE-OS 3005765 discloses a corresponding method in which the freezing of foundry sand is cured only in a certain layer thickness. The layer thickness depends on the coolant used and the cooling time.
  • the invention is therefore based on the object, a process for the production of cores, but especially not for the production of lost Ker- NEN, which come in forms on die casting machines for casting light metal materials used to apply, which allows a better over the prior art Entkernbarkeit.
  • the cores can also be solidified by means of heat removal, without affecting the Entkernbarkeit.
  • the pressure build-up is delayed so that the metal pressure in the holding pressure phase (3rd phase) always remains below the value of the penetration limit.
  • the surface of cores is thus not attacked and the corresponding surface parts of the casting are smooth and have a high casting quality.
  • the emphasis is gradually increased.
  • Another object is to provide cores, which are well guttable especially from die casting molds.
  • the cores are mechanically or chemically / thermally decorticated.
  • salt can be used as a binder for conventional fillers since it can be dissolved out with water.
  • Another alternative is frozen cores made of filler metal. fen, which are mixed with water or other, in particular ecologically harmless binders.
  • This salt core can be a specific resp. represent any contour or part of the contour and / or image the gate of the casting to the casting channel.
  • a local post-compressor eg a squeeze pin
  • the use of a local post-compressor can be omitted by changing the cooling behavior.
  • the lost core can also be provided with a "reinforcement" which can be pulled out of the core after the casting process, thereby mechanically damaging the core and enabling core removal, or at least simplifying it, the core can be a normal sand or salt core o.
  • a "reinforcement” which can be pulled out of the core after the casting process, thereby mechanically damaging the core and enabling core removal, or at least simplifying it, the core can be a normal sand or salt core o.
  • Be and its application is not limited to die casting.
  • the reinforcement may be laid (inserted, inserted) in lost cores in the form of flexible wire nets, wire nets and / or plastic nets, plastic braids, pins or other devices.
  • the core can collapse (by vibration or impulses or by detachment (chemical and / or physical) of the core material) inwards (into the cavity created by pulling out the reinforcement). This makes it easier to remove cores from lost cores, especially in diecasting. For example, this has hitherto not always been possible with media-carrying cavities / channels with a small cross-section
  • Destroying the chemical binder bridges of the cores can also be achieved by heating the castings to ensure easier gutting.
  • the latter allows new shapes (for example, in one piece instead of half shells and thereby eliminating processing) and a reduction in manufacturing and assembly costs, with increased quality. It also results in a cost savings compared to steel and a use in high-melting alloys with a small solidification interval as a mold insert.
  • Thermal expansions and stresses can be better controlled with the cores according to the invention; a mechanical surface treatment of the cast part can be reduced or completely avoided since cylindrical or parallel cross sections are imaged in the cavities of a casting.
  • the cores are used in diecasting, in particular for the imaging of cavities, undercuts, etc., regardless of the material to be cast.
  • valve housings u. a. very thin slide cores are used.
  • Electronic devices of all kinds with "openings" for buttons, antenna, plug
  • fiber-reinforced die-castings with cavities and undercuts or suspensions / brackets (hollow inside) can be produced with lost cores with less effort or can only be produced by die casting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L'invention concerne un procédé de fabrication de noyaux, notamment mais pas exclusivement, de fabrication de noyaux perdus employés dans des moules de machines de coulée sous pression pour la coulée de matériaux métalliques légers. L'invention est caractérisée en ce que la réaction de décomposition ou de dissolution d'un liant dans un noyau perdu démarre ou s'achève à des températures inférieures à environ la moitié de la température de fusion du métal à couler.
PCT/CH2009/000098 2008-05-22 2009-03-18 Procédé de fabrication de noyaux WO2009140775A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008001941A DE102008001941A1 (de) 2008-02-22 2008-05-22 Verfahren zur Herstellung von Kernen
DE102008001941.0 2008-05-22

Publications (1)

Publication Number Publication Date
WO2009140775A1 true WO2009140775A1 (fr) 2009-11-26

Family

ID=40668474

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2009/000098 WO2009140775A1 (fr) 2008-05-22 2009-03-18 Procédé de fabrication de noyaux

Country Status (1)

Country Link
WO (1) WO2009140775A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11179767B2 (en) 2017-01-11 2021-11-23 Ha-International Llc Compositions and methods for foundry cores in high pressure die casting

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5597844A (en) * 1979-01-17 1980-07-25 Honda Motor Co Ltd Forming method of cast-out hole
DE3144958A1 (de) * 1981-11-12 1983-05-19 Honsel-Werke Ag, 5778 Meschede "kern zum herstellen duenner kanaele in gussstuecken"
FR2707901A1 (fr) * 1993-07-23 1995-01-27 Peugeot Procédé pour la désagrégation d'un noyau de sable de fonderie.
DE19918908A1 (de) * 1999-04-26 2000-11-02 Fraunhofer Ges Forschung Kern für in Gußtechnik hergestellte Bauteile und Herstellverfahren dazu
US20040214917A1 (en) * 2003-04-25 2004-10-28 Marth Charles F. Urethane binder compositions for foundry applications
WO2006026423A2 (fr) * 2004-08-25 2006-03-09 Martin Zoldan Noyau en sable precontraint

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5597844A (en) * 1979-01-17 1980-07-25 Honda Motor Co Ltd Forming method of cast-out hole
DE3144958A1 (de) * 1981-11-12 1983-05-19 Honsel-Werke Ag, 5778 Meschede "kern zum herstellen duenner kanaele in gussstuecken"
FR2707901A1 (fr) * 1993-07-23 1995-01-27 Peugeot Procédé pour la désagrégation d'un noyau de sable de fonderie.
DE19918908A1 (de) * 1999-04-26 2000-11-02 Fraunhofer Ges Forschung Kern für in Gußtechnik hergestellte Bauteile und Herstellverfahren dazu
US20040214917A1 (en) * 2003-04-25 2004-10-28 Marth Charles F. Urethane binder compositions for foundry applications
WO2006026423A2 (fr) * 2004-08-25 2006-03-09 Martin Zoldan Noyau en sable precontraint

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HÜTTENES-ALBERTUS INTERNATIONAL LLC: "Technical Data Sheet - Sigma Cure PM11 Part I & PM20 Part 2", 2001, pages 1 - 4, XP002530813, Retrieved from the Internet <URL:www.ha-international.com/tds/306261.pdf> [retrieved on 20090605] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11179767B2 (en) 2017-01-11 2021-11-23 Ha-International Llc Compositions and methods for foundry cores in high pressure die casting

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