EP1781433A2 - 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

Info

Publication number
EP1781433A2
EP1781433A2 EP04803396A EP04803396A EP1781433A2 EP 1781433 A2 EP1781433 A2 EP 1781433A2 EP 04803396 A EP04803396 A EP 04803396A EP 04803396 A EP04803396 A EP 04803396A EP 1781433 A2 EP1781433 A2 EP 1781433A2
Authority
EP
European Patent Office
Prior art keywords
salt
salt core
phosphate
water
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.)
Withdrawn
Application number
EP04803396A
Other languages
German (de)
English (en)
Inventor
Manfred Laudenklos
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.)
KS Huayu Alutech GmbH
Original Assignee
KS Aluminium Technologie GmbH
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 GmbH filed Critical KS Aluminium Technologie GmbH
Publication of EP1781433A2 publication Critical patent/EP1781433A2/fr
Withdrawn legal-status Critical Current

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 further relates to a salt core for use in, for example, a pressurized mold.
  • 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.

Landscapes

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

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.
EP04803396A 2003-12-17 2004-12-01 Noyau pouvant etre retire pour le moulage de metaux et procede de production dudit noyau Withdrawn EP1781433A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
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
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

Publications (1)

Publication Number Publication Date
EP1781433A2 true EP1781433A2 (fr) 2007-05-09

Family

ID=34701999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04803396A Withdrawn EP1781433A2 (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)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10359547B3 (de) * 2003-12-17 2005-03-03 Emil Müller GmbH Wasserlösliche Salzkerne
EP1934002B1 (fr) * 2005-09-30 2019-07-31 CeramTec GmbH Noyaux et procédé de production de 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
RU2551335C2 (ru) * 2008-07-18 2015-05-20 Керамтек Гмбх Стержень на солевой основе и способ его изготовления
WO2011054920A2 (fr) * 2009-11-06 2011-05-12 Emil Müller GmbH Noyaux à base de sel, procédé de fabrication de ces noyaux et leur utilisation
CN109047670B (zh) * 2018-08-24 2020-07-17 南京泉峰汽车精密技术股份有限公司 盐芯制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005058527A1 (fr) * 2003-12-17 2005-06-30 Emil Müller GmbH Noyaux de sel solubles dans l'eau

Family Cites Families (8)

* 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
CA1144338A (fr) 1978-05-25 1983-04-12 Enno H. Page Noyaux perdus pour la coulee en moule
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
JPH0815647B2 (ja) 1990-06-28 1996-02-21 宇部興産株式会社 エンジンブロツクの鋳造装置
GB2253170B (en) 1991-02-28 1994-08-10 Ae Piston Products Removable cores for metal castings
GB9324509D0 (en) * 1993-11-30 1994-01-19 Borden Uk Ltd Foundry binder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005058527A1 (fr) * 2003-12-17 2005-06-30 Emil Müller GmbH Noyaux de sel solubles dans l'eau
EP1691942A1 (fr) * 2003-12-17 2006-08-23 Emil Müller GmbH Noyaux de sel solubles dans l'eau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2005058526A2 *

Also Published As

Publication number Publication date
WO2005058526A2 (fr) 2005-06-30
WO2005058526A3 (fr) 2005-12-01

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