EP1502676B1 - Giesskern auf der Basis von Kaliumborat mit einer Auflösungskammer - Google Patents

Giesskern auf der Basis von Kaliumborat mit einer Auflösungskammer Download PDF

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Publication number
EP1502676B1
EP1502676B1 EP20040300450 EP04300450A EP1502676B1 EP 1502676 B1 EP1502676 B1 EP 1502676B1 EP 20040300450 EP20040300450 EP 20040300450 EP 04300450 A EP04300450 A EP 04300450A EP 1502676 B1 EP1502676 B1 EP 1502676B1
Authority
EP
European Patent Office
Prior art keywords
core
casting
cavity
mould
mold
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 - Fee Related
Application number
EP20040300450
Other languages
English (en)
French (fr)
Other versions
EP1502676A1 (de
Inventor
André LE NEZET
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.)
Renault SAS
Original Assignee
Renault SAS
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1502676A1 publication Critical patent/EP1502676A1/de
Application granted granted Critical
Publication of EP1502676B1 publication Critical patent/EP1502676B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • 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

Definitions

  • the invention relates to a core for producing hollow forms by casting, a mold and a method for producing such a core.
  • the invention relates more particularly to a core for producing hollow shapes by casting, obtained by molding a casting of molten mineral salts in a mold.
  • the document JP-A-0.1.306043 discloses and shows an arrangement for molding a core in a U-shaped cavity (2) of a mold (1).
  • the molten material (10) by means of which the core is made is introduced into the mold (1) via a valve (5) arranged at the end of one of the branches of the mold. "U”.
  • the valve (5) is closed so that the material (10), while cooling, retracts with respect to the walls of the cavity (2) of the mold (1).
  • the valve (5) is opened and a valve (6) arranged at the end of the opposite branch of the "U” and a suction is provoked by these valves to extract the core from a single block of the mold (1) .
  • the kernel is extracted from one block. This is not always possible.
  • the document FR-2819205 discloses a core comprising inorganic salts such as potassium metaborate or monoborate, potassium diborate, potassium triborate, potassium tetraborate, or potassium pentaborate.
  • Such a core is compatible with pressure casting processes, for the realization of hollow shapes of fine geometries, and compatible with all types of light alloys used in these processes.
  • It can be used in a pressure casting process, but it can also be used in a casting process with gravity casting, in order to improve the surface condition of the cavities and to make cavities of more geometries. complex, compared to a casting process using gravity casting using a core based on sand or conventional mineral salts.
  • a core After the casting of a casting with such a core, a core, whatever it is, must be removed from the mold release part in order to use and / or machine said part .
  • This phenomenon is opposed to a rapid dissolution of the nucleus, and thus increases the duration during which the piece coming from foundry is immobilized pending the dissolution of its nucleus or nuclei.
  • the invention provides a core of the type described above comprising means for promoting the penetration of water into the core and therefore accelerate its dissolution as defined in claim 1.
  • the invention proposes a core of the type described above, characterized in that it comprises an interior cavity intended to allow, after use of the core for the realization of a casting part, a solvent to have access by capillarity in the core of the core to accelerate dissolution.
  • the invention also relates to a method for producing a core of the type previously described as defined in claim 4, of the type which comprises at least one molding operation of the core, characterized in that the molding operation is followed by a fast cooling operation of the outer surface of the core.
  • the invention also relates to a mold for producing a core comprising cooling means arranged near the wall of the mold cavity.
  • the mold comprises internal heating means.
  • figure 1 a cluster molding operation of two cores 10 for producing a casting piece of the type of the piece 12 which has been shown in FIGS. Figures 2 and 3 .
  • a casting of molten mineral salts is carried out in a feed funnel 14 of a mold 16.
  • the feed funnel communicates at its lower end with an imprint 18 of the mold 16.
  • At least a part of the inorganic salts is chosen for example from potassium borates to obtain a core 10 having high mechanical characteristics.
  • the mineral salts are distributed by gravity in the footprint 18 of the mold 16 according to the arrows "F" to constitute, after cooling, the core 12.
  • a casting piece 12 having a hollow shape 20 is obtained by an operation of molding with the previously obtained core.
  • the hollow form 20 is complementary to the core 10, and it is necessary to be able to exploit this hollow form 20 to dissolve the core 10 with the aid of a solvent, for example water in the case of a core 10 according to the invention comprising salts based on potassium borate.
  • the solvent is introduced through an end opening 22 of the mold 12.
  • the solvent propagates in the core 10 along successive front lines 24, progressively dissolving the core 10 from the line to the left of the figure 2 .
  • the operation of dissolving the core 10 is a long operation which, in the case of mass production, generates high immobilization costs in the workshop where the dissolution of the cores 10 is carried out.
  • the invention proposes a core 10 having an internal cavity 26 intended, after use of the core 10 for producing a casting part 12, to allow a solvent to have access by capillarity to the core the core 10 to accelerate the dissolution in the room 12.
  • the solvent enters the cavity 26 as shown in FIG. figure 3 and propagates from the inside to the outside of the core along various directions represented by the arrows of the figure 3 .
  • the internal cavity 26 is made during the molding operation of the core 10.
  • the cavity 26 could, in a non-limiting manner of the invention, be made by drilling or by introducing, before molding the core, a temperature element of higher melting than the potassium borate salts, which element would be removed from the core prior to the dissolution operation of the core 10 to form the cavity 26.
  • the cavity 26 consists of an inner core shrinkage obtained by rapid cooling of the outer surface 28 of the core 10 during its molding.
  • a method of manufacturing the core 10 comprises at least one molding operation as previously mentioned with reference to FIG. figure 1 followed by a rapid cooling operation of the outer surface 28 of the core 10.
  • the mold 16 comprises cooling means 30 arranged near the wall of the cavity 18 of the mold 16,
  • cooling means constituted by an exchanger 32 housed in the mold 16.
  • the exchanger is supplied with heat transfer fluid by a arrival conduit 34 and this fluid is discharged through a conduit 36.
  • This configuration allows to evacuate a large number of calories in a very short time.
  • Such exchangers 34 are distributed along the entire periphery of the cavity 18, to ensure rapid and uniform cooling of the cavity 18.
  • the method may comprise a preliminary heating operation of the mold 16 so as to reduce the initial difference in temperature between the inorganic salts and the mold 16.
  • the mold 16 comprises internal heating means 38, for example one or more electrical resistors 40 housed in the mold 16 and intended to allow its temperature rise uniformly.
  • the invention thus makes it possible to produce potassium borate mineral salts which have the particularity of being rapidly dissolvable, which makes it possible to reduce the costs and the production times of parts 12 molded with such cores.

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

Claims (7)

  1. Kern (10) für die Verwirklichung von Hohlformen durch Gießen, der durch Formen eines Abstichs geschmolzener Mineralsalze in einer Gießform (16) erhalten wird,
    dadurch gekennzeichnet, dass er einen inneren Hohlraum (26) enthält, der dazu bestimmt ist, einem Lösungsmittel mittels Kapillarität einen Zugang in das Innere des Kerns zu ermöglichen, um seine Auflösung in dem Teil (12) nach der Verwendung des Kerns zu beschleunigen.
  2. Kern (10) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der innere Hohlraum (26) beim Formen des Kerns gebildet wird.
  3. Kern (10) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Hohlraum (26) durch ein inneres Einsacken des Kerns, das infolge einer Abkühlung erhalten wird, die an seiner äußeren Oberfläche (28) schneller erfolgt als in seinem Kern, gebildet wird.
  4. Verfahren zum Herstellen eines Kerns (10) nach Anspruch 3, dadurch gekennzeichnet, dass dem Vorgang des Formens ein Vorgang der schnellen Abkühlung der äußeren Oberfläche (28) des Kerns (10) folgt.
  5. Verfahren zum Herstellen eines Kerns (10) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass während des Vorgangs der schnellen Abkühlung der äußeren Oberfläche (28) des Kerns (10) die Wand (18) eines Formhohlraums der Gießform (16), die mit dem Kern (10) in Kontakt ist, mit Hilfe von Kühlungsmitteln (30), die in der Nähe der Wand (18) des Formhohlraums der Gießform (16) angeordnet sind, schnell abgekühlt wird.
  6. Verfahren zum Herstellen eines Kerns (10) nach einem der vorhergehenden Ansprüche 4 oder 5, dadurch gekennzeichnet, dass die geschmolzenen Mineralsalze während des Vorgangs des Formens des Kerns durch Schwerkraft in die Gießform (16) gegossen werden.
  7. Verfahren zum Herstellen eines Kerns (10) nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass es vor dem Vorgang des Formens einen vorhergehenden Vorgang des Erwärmens der Gießform (16) mit Hilfe von Heizmitteln (38) in der Gießform (16) enthält, um den anfänglichen Temperaturunterschied zwischen den Mineralsalzen und der Gießform (16) zu verringern.
EP20040300450 2003-07-31 2004-07-19 Giesskern auf der Basis von Kaliumborat mit einer Auflösungskammer Expired - Fee Related EP1502676B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0309428A FR2858256B1 (fr) 2003-07-31 2003-07-31 Noyau de fonderie a base de borates de potassium comportant une cavite de dissolution
FR0309428 2003-07-31

Publications (2)

Publication Number Publication Date
EP1502676A1 EP1502676A1 (de) 2005-02-02
EP1502676B1 true EP1502676B1 (de) 2009-12-16

Family

ID=33523030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040300450 Expired - Fee Related EP1502676B1 (de) 2003-07-31 2004-07-19 Giesskern auf der Basis von Kaliumborat mit einer Auflösungskammer

Country Status (4)

Country Link
EP (1) EP1502676B1 (de)
DE (1) DE602004024620D1 (de)
ES (1) ES2336104T3 (de)
FR (1) FR2858256B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004046962A1 (de) * 2004-09-28 2006-04-06 Volkswagen Ag Gießverfahren
DE102005023901A1 (de) * 2005-05-24 2006-11-30 Volkswagen Ag Einsatz von Heizpatronen im Schwerkraft und Niederdruckkokillenguss
DE102008037778A1 (de) * 2008-08-14 2010-02-18 Volkswagen Ag Gießvorrichtung und Kokille für eine Gießvorrichtung
DE102015118901A1 (de) * 2015-11-04 2017-05-04 Uwe Richter Verfahren der konturnahen flächenhaften Temperierung von segmentierten schalenförmigen Formwerkzeugen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01306043A (ja) * 1988-05-31 1989-12-11 Tsuchiya Mfg Co Ltd 熱可融性中子の製造方法
US5303761A (en) * 1993-03-05 1994-04-19 Puget Corporation Die casting using casting salt cores
GB9625312D0 (en) * 1996-12-05 1997-01-22 Dynacast Int Ltd Die casting and like moulds
FR2819205B1 (fr) * 2001-01-05 2003-03-21 Renault Noyau de fonderie a base de borates de potassium et procede de fabrication d'un tel noyau

Also Published As

Publication number Publication date
FR2858256A1 (fr) 2005-02-04
DE602004024620D1 (de) 2010-01-28
EP1502676A1 (de) 2005-02-02
FR2858256B1 (fr) 2006-02-10
ES2336104T3 (es) 2010-04-08

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