EP1502676A1 - 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
EP1502676A1
EP1502676A1 EP04300450A EP04300450A EP1502676A1 EP 1502676 A1 EP1502676 A1 EP 1502676A1 EP 04300450 A EP04300450 A EP 04300450A EP 04300450 A EP04300450 A EP 04300450A EP 1502676 A1 EP1502676 A1 EP 1502676A1
Authority
EP
European Patent Office
Prior art keywords
core
mold
cavity
molding
dissolution
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.)
Granted
Application number
EP04300450A
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English (en)
French (fr)
Other versions
EP1502676B1 (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
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 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 - Lifetime 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 the production of foundry hollow forms, a mold and a method for realization of such a core.
  • the invention relates more particularly to a core for the creation of hollow shapes by casting, obtained by molding a casting of molten mineral salts in a mold.
  • Document 2.819.205 describes and represents such a core containing inorganic salts such as metaborate or potassium monoborate, potassium diborate, triborate of potassium, potassium tetraborate, or potassium pentaborate.
  • Such a core is compatible with foundry processes under pressure, for the realization of hollow forms of fine geometries, and compatible with all types of alloys used in these processes.
  • It can be used in a foundry process under pressure, but it can also be used in a process of foundry with gravity casting, with a view to improving the state of cavities surface and in order to make cavities of more complex geometries, compared to a foundry process with gravity casting using a sand-based core or classic mineral salts.
  • any nucleus must be removed from the raw demolding in order to use and / or machine said part.
  • This phenomenon is opposed to a rapid dissolution of the kernel, and thereby increases the duration during which the coin coming from foundry is immobilized pending dissolution of his or her nuclei.
  • the invention proposes a core of the type described above comprising means intended to promote the penetration of water into the core and therefore, to accelerate its dissolution.
  • the invention proposes a core of the type described previously, characterized in that it comprises a cavity interior intended to allow, after use of the core for the making a casting, to a solvent to have access to capillarity in the heart of the nucleus in order to accelerate its dissolution.
  • the invention also relates to a method for producing a nucleus of the type previously described, of the type least one molding operation of the core, characterized in that the molding operation is followed by an operation of rapid cooling of the outer surface of the core.
  • the invention also relates to a mold for the production a core having cooling means arranged at near the wall of the mold cavity.
  • this one has internal heating means.
  • FIG. 1 shows a molding operation in cluster of two cores 10 for the realization of a piece of foundry of the type of the piece 12 which has been shown in FIGS. 2 and 3.
  • a casting of mineral salts is carried out in melting in a feed funnel 14 of a mold 16.
  • the feed funnel communicates at its lower end with an impression 18 of the mold 16.
  • At least a part of the mineral salts is chosen by example among potassium borates to obtain a nucleus 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 form, after cooling, the core 12.
  • a casting 12 having a hollow shape 20 is obtained by an operation molding with the core 10 previously obtained.
  • the form hollow 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 using a solvent, for example water in the case of a core 10 according to the invention comprising salts based on potassium borate.
  • the dissolution operation of the core 10 is a long operation which, in the case of a large production series, generates high capital costs in the workshop where is made the dissolution of the nuclei 10.
  • the invention proposes a core 10 having a interior cavity 26 intended, after use of the core 10 for the making a casting part 12, to allow a solvent to have access by capillarity to the core of the core 10 in order to accelerate the dissolution in the room 12.
  • the solvent enters the cavity 26 as shown in FIG. and propagates from the inside to the outside of the nucleus according to various directions 28 represented by the arrows in FIG.
  • the inner cavity 26 is performed during the molding operation of the core 10.
  • the cavity 10 could, without limitation, the invention, to be carried out by drilling or by introducing, prior to molding the core, a temperature element higher melting point than potassium borate salts, element that would be removed from core 10 prior to the operation of dissolution of the core 10 to form the cavity 26.
  • the cavity 26 consists of an internal shrinkage of the core obtained thanks to a rapid cooling of the surface outer 28 of the core 10 during its molding.
  • a method of manufacturing the core 10 comprises at least one molding operation such that previously mentioned with reference to Figure 1, followed by a rapid cooling operation of the outer surface 28 of the core 10.
  • the mold 16 has cooling means arranged nearby of the wall of the cavity 18 of the mold 16,
  • Such exchangers 34 are distributed according to the entire periphery of the footprint 18, to ensure cooling fast and uniform impression 18.
  • the method may comprise a preliminary operation of heating the mold 16 so as to reduce the initial difference temperature between the mineral salts and the mold 16.
  • the mold 16 comprises internal means of heating 38, for example one or more resistors 40 housed in the mold 16 and intended (s) to allow its temperature rise in a uniform way.
  • the invention thus makes it possible to produce salt cores Potassium borate-based minerals that have the particularity to be quickly dissolvable, which reduces costs and the production times of molded parts 12 with such nuclei.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP20040300450 2003-07-31 2004-07-19 Giesskern auf der Basis von Kaliumborat mit einer Auflösungskammer Expired - Lifetime EP1502676B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040300450 Expired - Lifetime 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)

Cited By (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

Citations (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
EP0613742A1 (de) * 1993-03-05 1994-09-07 Puget Corporation Gegossene Salzkerne für den Druckguss
WO1998024573A1 (en) * 1996-12-05 1998-06-11 Dynacast Limited Die casting and like moulds
FR2819205A1 (fr) * 2001-01-05 2002-07-12 Renault Noyau de fonderie a base de borates de potassium et procede de fabrication d'un tel noyau

Patent Citations (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
EP0613742A1 (de) * 1993-03-05 1994-09-07 Puget Corporation Gegossene Salzkerne für den Druckguss
WO1998024573A1 (en) * 1996-12-05 1998-06-11 Dynacast Limited Die casting and like moulds
FR2819205A1 (fr) * 2001-01-05 2002-07-12 Renault Noyau de fonderie a base de borates de potassium et procede de fabrication d'un tel noyau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 097 (M - 0940) 22 February 1990 (1990-02-22) *

Cited By (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

Also Published As

Publication number Publication date
DE602004024620D1 (de) 2010-01-28
ES2336104T3 (es) 2010-04-08
EP1502676B1 (de) 2009-12-16
FR2858256B1 (fr) 2006-02-10
FR2858256A1 (fr) 2005-02-04

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