WO2005058526A2 - Noyau pouvant etre retire pour le moulage de metaux et procede de production dudit noyau - Google Patents

Noyau pouvant etre retire pour le moulage de metaux et procede de production dudit noyau Download PDF

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Publication number
WO2005058526A2
WO2005058526A2 PCT/EP2004/013626 EP2004013626W WO2005058526A2 WO 2005058526 A2 WO2005058526 A2 WO 2005058526A2 EP 2004013626 W EP2004013626 W EP 2004013626W WO 2005058526 A2 WO2005058526 A2 WO 2005058526A2
Authority
WO
WIPO (PCT)
Prior art keywords
salt
salt core
phosphate
water
core
Prior art date
Application number
PCT/EP2004/013626
Other languages
German (de)
English (en)
Other versions
WO2005058526A3 (fr
Inventor
Manfred Laudenklos
Original Assignee
Ks Aluminium-Technologie 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 DE10359547A external-priority patent/DE10359547B3/de
Priority claimed from DE200410006600 external-priority patent/DE102004006600B4/de
Application filed by Ks Aluminium-Technologie Ag filed Critical Ks Aluminium-Technologie Ag
Priority to EP04803396A priority Critical patent/EP1781433A2/fr
Publication of WO2005058526A2 publication Critical patent/WO2005058526A2/fr
Publication of WO2005058526A3 publication Critical patent/WO2005058526A3/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
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the invention relates to a method for producing a water-soluble salt core for the production of a mold cavity in a molded by a casting process
  • the invention further relates to a salt core for use in, for example, a pressurized mold.
  • the casting mold is arranged and cast with molten metal, the casting mold being filled and the mold core being enclosed.
  • a major problem with the pressurized casting process is creating a pressure-resistant mandrel.
  • the mold core must be pressure-resistant on the one hand, but on the other hand it must also be easy to remove after the casting has cooled.
  • the mold core must prevent penetration of the surrounding liquid casting metal.
  • the liquid metal is usually filled into the casting mold under high pressure, so that the mold core, in addition to the high pressure resistance, should also have a high resistance to the liquid metal.
  • a field of application in which molded bodies are used for casting are pistons of internal combustion engines. Especially with supercharged engines and with heavily loaded diesel and gasoline engines, the heat generated in the piston during the combustion process is so high that intensive piston cooling is necessary.
  • the piston can be specially equipped with a cooling channel arranged in the piston crown so that the necessary heat dissipation is ensured.
  • the cast salt cores are inserted into the mold during casting, which has the geometry of the later Have cooling channel and which are rinsed out with water and compressed air after the metal has solidified.
  • Salt cores for casting are, however, only suitable for gravity casting, since they are not very pressure-resistant and at the same time tend to penetrate, so that bumps or even small partitions occur in the finished cooling channel, which hinder the flow of cooling oil.
  • Various methods have become known in order to prevent the penetration of molten metal into the salt core and at the same time to make the salt core pressure-resistant.
  • EP 0 501 549 B1 describes a method for producing a salt core.
  • the method includes the steps of mixing a coarse particle salt powder with a fine particle salt powder in a ratio of 50:50 to 70:30 coarse to fine, the coarse powder having a maximum particle size of 250 microns and the fine powder a maximum particle size of 25 micrometers, further adding a lubricant, pressing the mixture to form a desired core shape and sintering at a temperature in the range of 650 ° C to 775 ° C.
  • a surface active By means provided.
  • the object of the invention is to develop a method for producing a water-soluble salt core, with which a salt core can be produced which can be removed easily, has good resistance to the encapsulating metal and at the same time permits low penetration of the liquid metal.
  • the process should be inexpensive and can be integrated into the existing process flow.
  • the object of the invention is achieved in that the salt core is produced according to the following process steps:
  • the means according to the invention it is now possible to create a pressure-resistant salt core which is easy to remove, which offers sufficient resistance to the liquid metal and which is also distinguished by an excellent surface smoothness, so that penetration of the liquid metal is prevented.
  • the salt core is extremely inexpensive to manufacture and can also be integrated into the production process of a casting process without additional process steps.
  • the gases introduced from the salt core into the melt during the casting preferably phosphorus, are used for refinement.
  • the phosphorus has a positive effect on the enthalpy of binding in the directional solidification, it supports the nucleation, which results in a finer grain.
  • the application-technical task is solved in such a way that the salt core provided with the phosphate-containing refractory binder is inserted into the casting mold without preheating and then cast with a low-melting metal by means of a pressure-free or pressure-free casting process and the bound salt core is then removed using water.
  • the use of a phosphate-containing refractory binder increases the thermal shock capability of the salt core in such a way that it is not necessary to preheat the salt core.
  • the salt core can therefore immediately, that is, be inserted into the mold from the storage container or production. This offers the advantage according to the invention that the process step of preheating the salt core is eliminated.
  • the granular salt or sand is mixed with a phosphate-based refractory binder. Mixing is continued until a homogeneous mixture of salt or sand and refractory binder is available. 0.5 to 6% by weight of the refractory binder is added to the salt.
  • phosphate-containing refractory binders for example, phosphates of the form sodium hexamate taphosphate, which is also sold under the trade name Budit 6, boron phosphate monohydrate, which is sold under the trade name FFB 761, monoaluminum dihydrogen orthophosphate, which is sold under the trade name FFB 716 or a combination of inorganic borates and phosphates, which are sold under the trade name FFB 102 and which include, for example, the monozinc phosphates. It is also conceivable according to the invention, a phosphates of the form sodium hexamate taphosphate, which is also sold under the trade name Budit 6, boron phosphate monohydrate, which is sold under the trade name FFB 761, monoaluminum dihydrogen orthophosphate, which is sold under the trade name FFB 716 or a combination of inorganic borates and phosphates, which are sold under the trade name FFB 102 and which include, for example
  • the molding tool is a permanent mold, which can represent, for example, a cooling channel for a piston or a cylinder crankcase.
  • the mixture of salt and refractory binder is compressed in the mold under a pressure of approx. 800 bar and pressed at an elevated temperature of up to approx. 350 ° C to form the salt core.
  • the refractory binder polymerizes under the high pressure and the influence of the elevated temperature, and the refractory binder may also melt, so that a pressure-resistant salt core which is resistant to the liquid metal is formed.
  • the polymerization or melting of the refractory binder creates a very smooth surface on the salt core, which prevents the liquid metal from penetrating into the salt core. It is also conceivable according to the invention to press the homogeneous mixture of salt and refractory binder only under high pressure.
  • a salt core is created according to the invention which is easy to dissolve and which can be very easily rinsed out of the cast component by means of water.
  • the phosphate binder and the salt are water-soluble in the form according to the invention, but at the same time offer the advantage of a pressure-resistant salt core and a resistant surface. Castings can thus be produced which, on the one hand, have undercut contours and which are free from penetrations roughening the surface of the finished casting or even partitions due to breaks in the salt cores.
  • salt cores according to the invention can of course also be used in the so-called squeeze casting process.
  • the mold is first filled largely without pressure and subsequently completely filled, for example for the infiltration of porous bodies under pressure, and then kept under pressure until the liquid
  • the salt core must have a high level of resistance.
  • the object of the present invention is furthermore to provide salt cores which have sufficient tensile strength even at sintering temperatures of from 200 ° C. and which can be used at temperatures below 700 ° C. and with all known types of casting.
  • water-soluble salt cores which are produced by compressing a mixture of water-soluble salts and a binder under pressure and then polymerizing, are characterized in that the binder is an inorganic phosphate or a mixture of inorganic phosphates with a proportion of between 1.5 and 6% by weight. -% of the mixture is.
  • the mixture may contain a portion of an inorganic borate.
  • a high proportion of binder gives a rather rough surface depending on the grain size of the salt at low pressure, a low proportion of binder at high pressure gives a smooth surface.
  • the inorganic phosphate is, for example, a monoaluminum phosphate, a boron phosphate or a sodium polyphosphate.
  • the heat treatment takes place at temperatures below 730 ° C., so that there is no change in the degree of polymerization of the binder system of the salt cores, preferably at temperatures between 200 ° C. and 650 ° C., this is also referred to as the first polymerization stage.
  • Temperatures above 760 ° C, but in particular actually above 850 ° C lead to glazing of the salt cores, which is then referred to as the second polymerization stage. It is pointed out here that, as is generally known, the polymerization and glazing is not tied to fixed temperature values, but that this is relative temperature information.
  • the costly preheating process in the foundry can be dispensed with; the salt cores can be used automatically at relatively low temperatures.
  • the heat treatment also takes place at temperatures below the 2nd polymerization stage of 700 - 750 ° C, which reduces the energy requirement in the core production.

Abstract

L'invention concerne un noyau de sel et un procédé pour produire un noyau de sel, utilisé dans la fabrication d'une empreinte dans un article formé à l'aide d'un procédé de fonte, la production d'un noyau de sel comprenant les étapes suivantes : mélange homogène d'un sel granulaire avec un liant réfractaire contenant du phosphate ; introduction du sel mélangé dans un outil de forme, de manière à former un noyau de sel ; et épaississement du noyau de sel à une pression et/ou à une température augmentée. L'invention concerne un noyau de sel utilisé dans un procédé de moulage qui peut améliorer la pressurisation.
PCT/EP2004/013626 2003-12-17 2004-12-01 Noyau pouvant etre retire pour le moulage de metaux et procede de production dudit noyau WO2005058526A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04803396A EP1781433A2 (fr) 2003-12-17 2004-12-01 Noyau pouvant etre retire pour le moulage de metaux et procede de production dudit noyau

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10359547 2003-12-17
DE10359547A DE10359547B3 (de) 2003-12-17 2003-12-17 Wasserlösliche Salzkerne
DE200410006600 DE102004006600B4 (de) 2004-02-11 2004-02-11 Entfernbarer Kern zum Metallgießen und Verfahren zur Herstellung eines Kerns
DE102004006600.0 2004-02-11

Publications (2)

Publication Number Publication Date
WO2005058526A2 true WO2005058526A2 (fr) 2005-06-30
WO2005058526A3 WO2005058526A3 (fr) 2005-12-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/013626 WO2005058526A2 (fr) 2003-12-17 2004-12-01 Noyau pouvant etre retire pour le moulage de metaux et procede de production dudit noyau

Country Status (2)

Country Link
EP (1) EP1781433A2 (fr)
WO (1) WO2005058526A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007036563A1 (fr) * 2005-09-30 2007-04-05 Ceramtec Ag Innovative Ceramic Engineering Noyaux et procede de production de noyaux
WO2010007180A2 (fr) * 2008-07-18 2010-01-21 Ceramtec Ag Noyaux à base de sel et procédé de fabrication desdits noyaux
CN1994615B (zh) * 2006-12-11 2010-12-01 东风汽车有限公司 一种发动机活塞盐芯
EP1691942B1 (fr) * 2003-12-17 2011-05-11 KS Aluminium-Technologie GmbH Noyaux de sel solubles dans l'eau
WO2011054920A3 (fr) * 2009-11-06 2011-10-13 Emil Müller GmbH Noyaux à base de sel, procédé de fabrication de ces noyaux et leur utilisation
CN109047670A (zh) * 2018-08-24 2018-12-21 南京泉峰汽车精密技术股份有限公司 盐芯制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298051A (en) 1978-05-25 1981-11-03 Nl Industries, Inc. Method of die casting utilizing expendable sand cores
EP0501549B1 (fr) 1991-02-28 1994-07-06 Ae Piston Products Limited Noyaux amovibles pour la coulée de métaux
EP0465947B1 (fr) 1990-06-28 1995-03-22 Ube Industries, Ltd. Procédé et dispositif de moulage d'un bloc-moteur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1047239A (fr) * 1900-01-01
US2930709A (en) * 1958-01-02 1960-03-29 Steel Founders Soc Of America Inorganic bonded cores for steel castings
US4383861A (en) * 1982-01-25 1983-05-17 International Minerals & Chemical Corp. Metal silico-phosphate binders and foundry shapes produced therefrom
SU1639872A1 (ru) * 1989-01-02 1991-04-07 Всесоюзный Проектно-Технологический Институт Литейного Производства Смесь дл изготовлени литейных форм и стержней
GB9324509D0 (en) * 1993-11-30 1994-01-19 Borden Uk Ltd Foundry binder
DE10359547B3 (de) * 2003-12-17 2005-03-03 Emil Müller GmbH Wasserlösliche Salzkerne

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298051A (en) 1978-05-25 1981-11-03 Nl Industries, Inc. Method of die casting utilizing expendable sand cores
EP0465947B1 (fr) 1990-06-28 1995-03-22 Ube Industries, Ltd. Procédé et dispositif de moulage d'un bloc-moteur
EP0501549B1 (fr) 1991-02-28 1994-07-06 Ae Piston Products Limited Noyaux amovibles pour la coulée de métaux

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1691942B1 (fr) * 2003-12-17 2011-05-11 KS Aluminium-Technologie GmbH Noyaux de sel solubles dans l'eau
WO2007036563A1 (fr) * 2005-09-30 2007-04-05 Ceramtec Ag Innovative Ceramic Engineering Noyaux et procede de production de noyaux
KR20140072149A (ko) * 2005-09-30 2014-06-12 세람테크 게엠베하 코어 및 코어 제조 방법
KR101492786B1 (ko) * 2005-09-30 2015-02-12 세람테크 게엠베하 코어 및 코어 제조 방법
KR101580775B1 (ko) 2005-09-30 2015-12-30 세람테크 게엠베하 코어 및 코어 제조 방법
CN1994615B (zh) * 2006-12-11 2010-12-01 东风汽车有限公司 一种发动机活塞盐芯
WO2010007180A2 (fr) * 2008-07-18 2010-01-21 Ceramtec Ag Noyaux à base de sel et procédé de fabrication desdits noyaux
WO2010007180A3 (fr) * 2008-07-18 2010-06-17 Ceramtec Ag Noyaux à base de sel et procédé de fabrication desdits noyaux
RU2551335C2 (ru) * 2008-07-18 2015-05-20 Керамтек Гмбх Стержень на солевой основе и способ его изготовления
WO2011054920A3 (fr) * 2009-11-06 2011-10-13 Emil Müller GmbH Noyaux à base de sel, procédé de fabrication de ces noyaux et leur utilisation
CN102695572A (zh) * 2009-11-06 2012-09-26 埃米尔·米勒有限责任公司 盐基型芯、其制造方法和用途
CN109047670A (zh) * 2018-08-24 2018-12-21 南京泉峰汽车精密技术股份有限公司 盐芯制备方法

Also Published As

Publication number Publication date
EP1781433A2 (fr) 2007-05-09
WO2005058526A3 (fr) 2005-12-01

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