WO2006111156A1 - Water-soluble salt grains - Google Patents

Water-soluble salt grains Download PDF

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Publication number
WO2006111156A1
WO2006111156A1 PCT/DE2006/000706 DE2006000706W WO2006111156A1 WO 2006111156 A1 WO2006111156 A1 WO 2006111156A1 DE 2006000706 W DE2006000706 W DE 2006000706W WO 2006111156 A1 WO2006111156 A1 WO 2006111156A1
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WO
WIPO (PCT)
Prior art keywords
water
soluble salt
salt cores
mixture
soluble
Prior art date
Application number
PCT/DE2006/000706
Other languages
German (de)
French (fr)
Inventor
Dieter GRÖZINGER
Original Assignee
Emil Müller 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
Application filed by Emil Müller GmbH filed Critical Emil Müller GmbH
Publication of WO2006111156A1 publication Critical patent/WO2006111156A1/en

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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

Definitions

  • the present invention relates to water-soluble salt cores having the features of the preamble of claim 1.
  • Such salt cores for foundry purposes that are washed out after the casting of parts have long been known, as well as attempts to optimize them by admixing additives. It was found in DE-C-14 83 641 that an addition of up to 10% borax, magnesium oxide or talc improves the load capacity of salt cores of NaCl and / or KCl. DE-C-19 24 991 proposes to further increase the compressive and flexural strength the addition of water glass. Also, other salts have been proposed, such as an alkaline metal halide in US-A-33 56 129. Graphite is often used as the release agent. However, graphite volatilizes only at relatively high temperatures to CO and CO 2 , so that in the sintered salt cores undesirable proportions may still be present.
  • the object of the present invention is to provide water-soluble salt cores with the addition of a release agent which volatilises at significantly lower temperatures and is no longer present when the sintering temperatures of the salt cores are reached.
  • water-soluble salt cores which are prepared by compressing water-soluble salts such as NaCl or KCl under pressure and subsequent heat treatment, are characterized in that they contain a proportion of 0.1 to 3% molybdenum disulfide (MoS 2 ) as release agent. It has, shows that overall molybdenum begins to outgas at about 315 ° C and is no longer detectable at about 450 0 C in the salt cores.
  • MoS 2 molybdenum disulfide
  • the water-soluble salt cores further contain 0.5 to 15 wt .-% of a porosity-generating additive such as sugar, wheat semolina or oat bran or a combination of at least two of these substances, wherein the sugar preferably has a grain size of 0.2 to 1.6 mm.
  • a porosity-generating additive such as sugar, wheat semolina or oat bran or a combination of at least two of these substances, wherein the sugar preferably has a grain size of 0.2 to 1.6 mm.
  • the water-soluble salt cores contain as binder an inorganic phosphate or a mixture of inorganic phosphates in a proportion of between 0.5 and 10 wt .-% of the mixture, wherein a proportion of an inorganic borate may be further included.
  • the heat treatment is carried out at temperatures below 730 ° C.
  • the compression is advantageously carried out under a pressure of between 300 and 900 N / mm 2 .
  • the heat treatment is preferably a sintering process, and the sintering of the pressed salt cores is carried out at 650-730 ° C between 10 hours and 2 hours.
  • the salt core is suitable for die casting.
  • the salt core is suitable for die casting.

Abstract

Water-soluble salt grains produced by compacting water-soluble salts such as NaCl or KCl under pressure, followed by a thermal treatment, and containing 0.1-3 % molybdenum disulphide (MoS2) as parting agent.

Description

Wasserlösliche SalzkerneWater-soluble salt cores
Beschreibungdescription
Die vorliegende Erfindung betrifft wasserlösliche Salzkerne mit den Merkmalen des Oberbegriffs des Anspruchs 1.The present invention relates to water-soluble salt cores having the features of the preamble of claim 1.
Solche Salzkerne für Gießereizwecke die nach dem Guss von Teilen ausgewaschen werden sind lange bekannt, wie auch Versuche, diese durch Beimischung von Zusatzstoffen zu optimieren. So wurde in der DE-C- 14 83 641 gefunden, dass eine Zugabe von bis zu 10% Borax, Magnesiumoxid oder Talkum die Belastbarkeit von Salzkernen aus NaCl und/oder KCl verbessert. Die DE-C- 19 24 991 schlägt zur weiteren Erhöhung der Druck- und Biegefestigkeit den Zusatz von Wasserglas. Auch wurden weitere Salze vorgeschlagen, wie zum Beispiel ein alkalisches Metallhalogenid in der US-A-33 56 129. Als Trennmittel wird häufig Graphit verwendet. Graphit verflüchtigt sich jedoch erst bei relativ hohen Temperaturen zu CO und CO2, so dass in den gesinterten Salzkernen noch unerwünschte Anteile vorhanden sein können.Such salt cores for foundry purposes that are washed out after the casting of parts have long been known, as well as attempts to optimize them by admixing additives. It was found in DE-C-14 83 641 that an addition of up to 10% borax, magnesium oxide or talc improves the load capacity of salt cores of NaCl and / or KCl. DE-C-19 24 991 proposes to further increase the compressive and flexural strength the addition of water glass. Also, other salts have been proposed, such as an alkaline metal halide in US-A-33 56 129. Graphite is often used as the release agent. However, graphite volatilizes only at relatively high temperatures to CO and CO 2 , so that in the sintered salt cores undesirable proportions may still be present.
Aufgabe der vorliegenden Erfindung ist es, wasserlösliche Salzkerne unter Beiga- be eines Trennmittels zu schaffen, das sich bei deutlich niedrigeren Temperaturen verflüchtigt und bei Erreichen der Sintertemperaturen der Salzkerne in diesen nicht mehr vorhanden ist.The object of the present invention is to provide water-soluble salt cores with the addition of a release agent which volatilises at significantly lower temperatures and is no longer present when the sintering temperatures of the salt cores are reached.
Diese Aufgabe wird mit den in Anspruch 1 genannten Merkmalen gelöst. Vorteil- hafte Ausführungen und Weiterentwicklungen der Erfindung und insbesondere ein erfindungsgemäßes Verfahren sind in den weiteren Ansprüchen umfasst. Erfindungsgemäß sind wasserlösliche Salzkerne, die durch Verdichten von wasserlöslichen Salzen wie NaCl oder KCl unter Druck und anschließender Wärmebehandlung hergestellt werden, dadurch gekennzeichnet, dass sie einen Anteil von 0,1 bis 3% Molybdändisulfid (MoS2) als Trennmittel enthalten. Es hat sich ge- zeigt, dass Molybdändisulfid an etwa 315°C auszugasen beginnt und bei ca. 4500C in den Salzkernen nicht mehr feststellbar ist.This object is achieved with the features mentioned in claim 1. Advantageous embodiments and further developments of the invention and in particular a method according to the invention are included in the further claims. According to the invention, water-soluble salt cores, which are prepared by compressing water-soluble salts such as NaCl or KCl under pressure and subsequent heat treatment, are characterized in that they contain a proportion of 0.1 to 3% molybdenum disulfide (MoS 2 ) as release agent. It has, shows that overall molybdenum begins to outgas at about 315 ° C and is no longer detectable at about 450 0 C in the salt cores.
Nach einer Ausführung der Erfindung enthalten die wasserlöslichen Salzkerne weiter 0,5 bis zu 15 Gew.-% eines Porosität erzeugenden Zusatzes wie Zucker, Weizengrieß oder Haferkleie oder eine Kombination wenigstens zweier dieser Stoffe, wobei der der Zucker vorzugsweise eine Korngröße von 0,2 bis 1,6 mm aufweist.According to one embodiment of the invention, the water-soluble salt cores further contain 0.5 to 15 wt .-% of a porosity-generating additive such as sugar, wheat semolina or oat bran or a combination of at least two of these substances, wherein the sugar preferably has a grain size of 0.2 to 1.6 mm.
Nach einer anderen Ausführung der Erfindung enthalten die wasserlöslichen Salzkerne als Bindemittel ein anorganisches Phosphat oder eine Mischung anorganischer Phosphate mit einem Anteil von zwischen 0,5 und 10 Gew.-% der Mischung, wobei weiter ein Anteil eines anorganischen Borats enthalten sein kann.According to another embodiment of the invention, the water-soluble salt cores contain as binder an inorganic phosphate or a mixture of inorganic phosphates in a proportion of between 0.5 and 10 wt .-% of the mixture, wherein a proportion of an inorganic borate may be further included.
Nach der bevorzugten Ausführung der Erfindung erfolgtn die Wärmebehandlung bei Temperaturen von unter 730°C. Die Verdichtung erfolgt vorteilhafterweise unter einem Druck von zwischen 300 und 900 N/mm2.According to the preferred embodiment of the invention, the heat treatment is carried out at temperatures below 730 ° C. The compression is advantageously carried out under a pressure of between 300 and 900 N / mm 2 .
Die Wärmebehandlung ist vorzugsweise ein Sinterprozess und dass das Sintern der gepressten Salzkerne wird bei 650 - 730° C zwischen Vz Std. und 2 Std. durch- geführt.The heat treatment is preferably a sintering process, and the sintering of the pressed salt cores is carried out at 650-730 ° C between 10 hours and 2 hours.
Im Folgenden wird die Erfindung anhand von Rezepturen rein beispielhaft näher dargestellt.In the following, the invention will be described purely by way of example with reference to recipes.
Mischung IMixture I
100 kg Salz 4,6 kg Borax 2.6 kg Magnesium100 kg of salt 4.6 kg borax 2.6 kg of magnesium
1.7 kg Molydändisulfid1.7 kg Molydändisulfid
Diese Mischung wird einem Pressdruck von 600 N/mm2 unterworfen und bei 700° C gesintert. Der Salzkern ist für den Druckguss geeignet.This mixture is subjected to a pressing pressure of 600 N / mm 2 and sintered at 700 ° C. The salt core is suitable for die casting.
Mischung IIMixture II
100 kg Salz 4,6 kg Borax100 kg of salt 4.6 kg borax
2,6 kg Magnesium2.6 kg of magnesium
0,8 kg Molybdändisulfid0.8 kg of molybdenum disulfide
Diese Mischung wird einem Pressdruck von 700 N/mm2 unterworfen und bei 720° C gesintert. Der Salzkern ist für den Druckguss geeignet.This mixture is subjected to a compacting pressure of 700 N / mm 2 and sintered at 720 ° C. The salt core is suitable for die casting.
Mischung IIIMixture III
97,5 Gew.-% Salz mit einer Korngröße von 0,16 - 0,7 mm, 1,5 Gew.-% Monoaluminiumphosphat, 1 Gew.-% Molybdändisulfid97.5 wt .-% salt with a particle size of 0.16 - 0.7 mm, 1.5 wt .-% monoaluminum phosphate, 1 wt .-% molybdenum disulfide
Mischung IVMix IV
97,5 Gew.-% Salz mit einer Korngröße von 0,16 - 0,7 mm 1,5 Gew.-% Borphosphat 1 Gew.-% Molydändisulfid97.5 wt .-% salt with a particle size of 0.16 - 0.7 mm 1.5 wt .-% boron phosphate 1 wt .-% Molydändisulfid
Mischung VMixture V
97,5 Gew.-% Salz mit einer Korngröße von 0,16 - 0,7 mm 1,5 Gew. -% Natriumpolyphosphat 1 Gew.-% Molybdändisulfid Mischung VI97.5% by weight of salt with a particle size of 0.16-0.7 mm 1.5% by weight of sodium polyphosphate 1% by weight of molybdenum disulfide Blend VI
97,5 Gew.-% Salz mit einer Korngröße von 0,16 - 0,7 mm 1,5 Gew.-% Borphosphat mit einem Anteil eines anorganischen Borats, 1 Gew.-% Molybdändisulfid97.5 wt .-% salt with a particle size of 0.16 - 0.7 mm 1.5 wt .-% boron phosphate with a proportion of an inorganic borate, 1 wt .-% molybdenum disulfide
Die Mischungen III bis VI ergaben wasserlösliche Salzkerne mit großer Zugfestigkeit. The mixtures III to VI gave water-soluble salt cores with high tensile strength.

Claims

Ansprüche claims
1. Wasserlösliche Salzkerne, die durch Verdichten von wasserlöslichen Salzen wie NaCl oder KCl unter Druck und anschließender Wärmebehandlung hergestellt werden, dadurch gekennzeichnet, dass die Mischung der Salzkerne einen Anteil von 0,1 bis 3% Molybdändisulfid (MoS2) als Trennmittel enthalten.1. Water-soluble salt cores, which are prepared by compressing water-soluble salts such as NaCl or KCl under pressure and subsequent heat treatment, characterized in that the mixture of the salt cores contain a proportion of 0.1 to 3% molybdenum disulfide (MoS 2 ) as a release agent.
2. Wasserlösliche Salzkerne nach Anspruch 1, dadurch gekennzeichnet,, dass sie weiter 0,5 bis zu 15 Gew.-% eines Porosität erzeugenden Zusatzes wie2. Water-soluble salt cores according to claim 1, characterized in that they further 0.5 to 15 wt .-% of a porosity-generating additive such as
Zucker, Weizengrieß oder Haferkleie oder eine Kombination wenigstens zweier dieser Stoffe enthalten.Sugar, wheat semolina or oat bran or a combination of at least two of these substances.
3. Wasserlöslicher Salzkern nach Anspruch 2, dadurch gekennzeichnet, dass der Zucker eine Korngröße von 0,2 bis 1,6 mm aufweist.3. Water-soluble salt core according to claim 2, characterized in that the sugar has a particle size of 0.2 to 1.6 mm.
4. Wasserlösliche Salzkerne nach Anspruch 1, dadurch gekennzeichnet, dass sie als Bindemittel ein anorganisches Phosphat oder eine Mischung anorgani- scher Phosphate mit einem Anteil von zwischen 0,5 und 10 Gew.-% der Mischung enthalten. 4. Water-soluble salt cores according to claim 1, characterized in that they contain as binders an inorganic phosphate or a mixture of inorganic phosphates with a proportion of between 0.5 and 10 wt .-% of the mixture.
5. Wasserlösliche Salzkerne nach Anspruch 4, dadurch gekennzeichnet, dass das Bindemittel einen Anteil eines anorganischen Borats enthält.5. Water-soluble salt cores according to claim 4, characterized in that the binder contains a proportion of an inorganic borate.
6. Wasserlösliche Salzkerne nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wärmebehandlung bei Temperaturen von unter 730°C erfolgt.6. Water-soluble salt cores according to one of the preceding claims, characterized in that the heat treatment is carried out at temperatures below 730 ° C.
7. Wasserlösliche Salzkerne nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verdichtung unter einem Druck von zwischen 300 und 900 N/mm2 erfolgt.7. Water-soluble salt cores according to one of the preceding claims, characterized in that the compression takes place under a pressure of between 300 and 900 N / mm 2 .
8. Wasserlösliche Salzkerne nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Wärmebehandlung ein Sinterprozess ist, und dass das Sintern der gepressten Salzkerne bei 650 - 730° C zwischen 1A Std. und 2 Std. durchgeführt wird. 8. Water-soluble salt cores according to one of the preceding claims, characterized in that the heat treatment is a sintering process, and that the sintering of the pressed salt cores is carried out at 650-730 ° C between 1 A and 2 hours.
PCT/DE2006/000706 2005-04-21 2006-04-21 Water-soluble salt grains WO2006111156A1 (en)

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Application Number Priority Date Filing Date Title
DE102005018614.9 2005-04-21
DE102005018614.9A DE102005018614B4 (en) 2005-04-21 2005-04-21 Process for the preparation of water-soluble salt cores

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011054920A3 (en) * 2009-11-06 2011-10-13 Emil Müller GmbH Salt-based cores, method for the production thereof and use thereof
CN103347625A (en) * 2010-12-23 2013-10-09 圣让工业公司 Process for manufacturing salt core by isostatic compaction for part implementing successive foundry and forging operation

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010038455A1 (en) 2010-07-27 2012-02-02 Federal-Mogul Nürnberg GmbH Preparing water-soluble salt cores for forming hollow molds in casting processes, comprises adding a metal powder to salt cores and heating the salt cores by magnetic induction to remove moisture
DE102010044287A1 (en) 2010-09-03 2012-03-08 Daimler Ag Producing die cast components using salt cores, comprises molding lost salt core for a hollow structure, inserting into the die casting mold and casting a molten metal around it, immersing die cast component into the molten salt bath
EP2836318A2 (en) * 2012-04-10 2015-02-18 Emil Müller GmbH Salt-based cores, method for the production thereof and use thereof
DE102013007735B4 (en) 2012-05-08 2015-10-15 Audi Ag Method for producing a castable salt core
CN110315023A (en) * 2019-06-21 2019-10-11 杨红 A kind of preparation method of the high-intensitive Water Soluble Compound salt core of casting

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483641A1 (en) * 1965-06-12 1969-02-27 Schmidt Gmbh Karl Method for casting cavities
DE1924991A1 (en) * 1969-05-16 1970-11-19 Schmidt Gmbh Karl Core for foundry purposes
SU519268A1 (en) * 1975-03-14 1976-06-30 Институт Механизации Металлополимерных Систем Ан Белорусской Сср Mixture for making water soluble casting cores
DE10312782A1 (en) * 2003-03-21 2004-10-07 Emil Müller GmbH Water-soluble salt cores and process for producing water-soluble salt cores
DE10359547B3 (en) * 2003-12-17 2005-03-03 Emil Müller GmbH Water soluble salt core prepared by compressing a mixture of water soluble salts and a binder under pressure and heating useful in casting operations
WO2005080022A2 (en) * 2004-02-19 2005-09-01 Emil Müller GmbH Water-soluble salt cores for die casting
DE102004038288A1 (en) * 2004-02-19 2005-09-08 Müller, Emil Water soluble salt cores for die casting obtained by compression of a mixture containing borax, Mg, graphite or talc, and salts useful for casting operations

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3001102C2 (en) * 1980-01-14 1982-09-23 Stefan 6057 Dietzenbach Graichen Solid lubricant
JPH069730B2 (en) * 1989-01-13 1994-02-09 花野商事株式会社 Powder mold release agent for die casting
DD296862B5 (en) * 1989-02-06 1994-09-29 Dresden Ev Inst Festkoerper Process for the production of semi-finished products, in particular metal strips by rapid solidification

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483641A1 (en) * 1965-06-12 1969-02-27 Schmidt Gmbh Karl Method for casting cavities
DE1924991A1 (en) * 1969-05-16 1970-11-19 Schmidt Gmbh Karl Core for foundry purposes
SU519268A1 (en) * 1975-03-14 1976-06-30 Институт Механизации Металлополимерных Систем Ан Белорусской Сср Mixture for making water soluble casting cores
DE10312782A1 (en) * 2003-03-21 2004-10-07 Emil Müller GmbH Water-soluble salt cores and process for producing water-soluble salt cores
DE10359547B3 (en) * 2003-12-17 2005-03-03 Emil Müller GmbH Water soluble salt core prepared by compressing a mixture of water soluble salts and a binder under pressure and heating useful in casting operations
WO2005080022A2 (en) * 2004-02-19 2005-09-01 Emil Müller GmbH Water-soluble salt cores for die casting
DE102004038288A1 (en) * 2004-02-19 2005-09-08 Müller, Emil Water soluble salt cores for die casting obtained by compression of a mixture containing borax, Mg, graphite or talc, and salts useful for casting operations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 197722, Derwent World Patents Index; Class M22, AN 1977-39366Y, XP002397274 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011054920A3 (en) * 2009-11-06 2011-10-13 Emil Müller GmbH Salt-based cores, method for the production thereof and use thereof
CN102695572A (en) * 2009-11-06 2012-09-26 埃米尔·米勒有限责任公司 Salt-based cores, method for the production thereof and use thereof
CN103347625A (en) * 2010-12-23 2013-10-09 圣让工业公司 Process for manufacturing salt core by isostatic compaction for part implementing successive foundry and forging operation

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DE102005018614B4 (en) 2016-07-28
DE102005018614A1 (en) 2006-10-26

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