EP1691942A1 - Water-soluble salt cores - Google Patents

Water-soluble salt cores

Info

Publication number
EP1691942A1
EP1691942A1 EP04802923A EP04802923A EP1691942A1 EP 1691942 A1 EP1691942 A1 EP 1691942A1 EP 04802923 A EP04802923 A EP 04802923A EP 04802923 A EP04802923 A EP 04802923A EP 1691942 A1 EP1691942 A1 EP 1691942A1
Authority
EP
European Patent Office
Prior art keywords
water
soluble salt
mixture
inorganic
phosphate
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
EP04802923A
Other languages
German (de)
French (fr)
Other versions
EP1691942B1 (en
Inventor
Dieter GRÖZINGER
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
Emil Mueller 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 Mueller GmbH filed Critical Emil Mueller GmbH
Publication of EP1691942A1 publication Critical patent/EP1691942A1/en
Application granted granted Critical
Publication of EP1691942B1 publication Critical patent/EP1691942B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/185—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents containing phosphates, phosphoric acids or its derivatives
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/2419—Fold at edge

Definitions

  • the present invention relates to water-soluble salt cores with the features of the preamble of claim 1.
  • the object of the present invention is to avoid the problems described by using an alternative binder and to provide salt cores which have sufficient tensile strength even at sintering temperatures of from 200 ° C. and which do not outgas at temperatures of below 700 ° C. and which can be used with all known types of casting.
  • 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.
  • water-soluble salt cores which are produced by compressing a mixture of water-soluble salts and a binder under pressure and then sintering are characterized in that the binder is an inorganic phosphate or a mixture of inorganic phosphates in a proportion of between 0.5 and 10% 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 at low pressure, a low proportion of binder at high pressure gives a smooth surface.
  • a sintering temperature 200 ° C tensile strengths of between 1 and 3 kg were achieved, at 400 ° C between 2 and 3 kg.
  • the mixture contains a proportion of between 0 and 10% by weight of a release agent such as graphite.
  • 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 state of aggregate of the salt cores, preferably at temperatures between 200 ° C and 650 ° C.
  • the tensile strength was determined by means of a pneumatic spring balance with a drag pointer, the drag pointer giving a kilogram value when the clamped test piece broke.
  • the costly process of pre-heating in the foundry can be dispensed with, the salt cores can be used automatically at relatively low temperatures and there is no outgassing.
  • the heat treatment also takes place at temperatures significantly below the sintering temperature (730 ° C.), which reduces the energy requirement in the core production.

Abstract

A water soluble salt core prepared by compressing a mixture of water soluble salts and a binder under pressure with final heat treatment, where the binder is an inorganic phosphate or a mixture of 0.5-10 wt.% inorganic phosphates.

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 with 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 Belastbar- keit von Salzkernen aus NaCl und/oder KC1 verbessert. Die DE-A-19 34 787 schlägt zur Vermeidung von Pressen und Sintern die Zugabe eines Kunstharzbinders und Wasserglas vor. Diese Beigaben sind auch aus der US-A-37 64 575 bekannt.Such salt cores for foundry purposes, which are washed out after the casting of parts, have long been known, as have attempts to optimize them by adding additives. It was found in DE-C-14 83 641 that the addition of up to 10% borax, magnesium oxide or talc improves the resilience of salt cores made of NaCl and / or KC1. DE-A-19 34 787 proposes the addition of a synthetic resin binder and water glass to avoid pressing and sintering. These additions are also known from US-A-37 64 575.
Die Nerwendung von Kunstharzbindern ist jedoch höchst problematisch, da sie bei den Gusstemperaturen karbonisieren und ausgasen. Dies ist für den Gussnachteilig, und so werden die Salzkerne in der Regel auf 600° C vorgewärmt, damit das Ausgasen vor dem Gießen erfolgt. Da die Kunstharzbinder zum großen Teil belastende Gase freisetzen, ist für diesen Vorgang eine Absaugung erforder- lieh. Auch die Handhabung der sehr heißen Salzkerne bei dem Einlegen in die Gussform wirft Probleme auf. Aus der DE 195 25 307 AI ist es bekannt, einen Gießkern aus Perlite, Νatriumhexametaphosphat und Wasser herzustellen.However, the use of synthetic resin binders is extremely problematic because they carbonize and outgas at the casting temperatures. This is disadvantageous for the casting, and so the salt cores are usually preheated to 600 ° C. so that the outgassing takes place before the casting. Since the synthetic resin binders largely release polluting gases, extraction is required for this process. Handling the very hot salt cores when inserting them into the mold also poses problems. From DE 195 25 307 AI it is known to produce a casting core from perlite, sodium hexametaphosphate and water.
Aufgabe der vorliegenden Erfindung ist es, die geschilderten Probleme durch Ein- satz eines alternativen Bindemittels zu vermeiden und Salzkerne zur Verfügung zu stellen, die bereits bei Sintertemperaturen von ab 200° C eines ausreichende Zugfestigkeit aufweisen, die bei Temperaturen von unter 700° C nicht ausgasen und die bei allen bekannten Gussarten einsetzbar sind. Diese Aufgabe wird mit den in Anspruch 1 genannten Merkmalen gelöst. Vorteilhafte Ausführungen und Weiterentwicklungen der Erfindung und insbesondere ein erfindungsgemäßes Verfahren sind in den weiteren Ansprüchen umfasst.The object of the present invention is to avoid the problems described by using an alternative binder and to provide salt cores which have sufficient tensile strength even at sintering temperatures of from 200 ° C. and which do not outgas at temperatures of below 700 ° C. and which can be used with all known types of casting. 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.
Erfindungsgemäß sind Wasserlösliche Salzkerne, die durch Verdichten einer Mischung aus wasserlöslichen Salzen und einem Bindemittel unter Druck und anschließendem Sintern hergestellt werden dadurch gekennzeichnet, dass das Bindemittel ein anorganisches Phosphat oder eine Mischung anorganischer Phosphate mit einem Anteil von zwischen 0,5 und 10 Gew.-% der Mischung ist. Die Mischung Kann einen Anteil eines anorganischen Borats enthalten. Ein hoher Anteil Bindemittel ergibt bei niedrigem Pressdruck eine eher raue Oberfläche, ein niedriger Anteil Bindemittel bei hohem Pressdruck eine glatte Oberfläche. Bei einer Sintertemperatur von 200° C wurden Zugfestigkeiten von zwischen 1 und 3 kg erzielt, bei 400° C von zwischen 2 und 3 kg.According to the invention, water-soluble salt cores which are produced by compressing a mixture of water-soluble salts and a binder under pressure and then sintering are characterized in that the binder is an inorganic phosphate or a mixture of inorganic phosphates in a proportion of between 0.5 and 10% 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 at low pressure, a low proportion of binder at high pressure gives a smooth surface. At a sintering temperature of 200 ° C tensile strengths of between 1 and 3 kg were achieved, at 400 ° C between 2 and 3 kg.
Nach einer vorteilhaften Ausführung der Erfindung enthält die Mischung einen Anteil von zwischen 0 und 10 Gew.-% eines Trennmittels wie Graphit.According to an advantageous embodiment of the invention, the mixture contains a proportion of between 0 and 10% by weight of a release agent such as graphite.
Das anorganische Phosphat ist beispielsweise ein Monoalumimumphosphat, ein Borphosphat oder ein Natriumpolyphosphat.The inorganic phosphate is, for example, a monoaluminum phosphate, a boron phosphate or a sodium polyphosphate.
Die Wärmebehandlung erfolgt bei Temperaturen von unter 730°C, so dass keine Änderung des Aggregatszustands der Salzkerne eintritt, vorzugsweise bei Tempe- raturen von zwischen 200°C und 650°C.The heat treatment takes place at temperatures below 730 ° C so that there is no change in the state of aggregate of the salt cores, preferably at temperatures between 200 ° C and 650 ° C.
Im Folgenden wird die Erfindung anhand von Versuchen rein beispielhaft näher dargestellt. Die Zugfestigkeit wurde mittels einer pneumatischen Federzugwaage mit Schleppzeiger ermittelt, wobei der Schleppzeiger bei Bruch des eingespannten Versuchsstücks einen Kilogrammwert angab.In the following, the invention is illustrated in more detail purely by way of example. The tensile strength was determined by means of a pneumatic spring balance with a drag pointer, the drag pointer giving a kilogram value when the clamped test piece broke.
Versuch I 97,5 Gew.-% Salz mit einer Korngröße von 0,16 - 0,7 mm, 1,5 Gew.-% Monoalumimumphosphat, 1 Gew.-% GraphitExperiment I 97.5% by weight of salt with a grain size of 0.16-0.7 mm, 1.5% by weight of monoaluminum phosphate, 1% by weight of graphite
wurden gepresst und wärmebehandelt. Es ergaben sich Zugfestigkeiten beiwere pressed and heat treated. There were tensile strengths
200°C von ca. 3 Kg, 300°C von ca. 3 Kg, 400°C von ca. 3 Kg 500°C von ca. 4,5 Kg.200 ° C of approx. 3 kg, 300 ° C of approx. 3 kg, 400 ° C of approx. 3 kg 500 ° C of approx. 4.5 kg.
Versuch IITrial II
97,5 Gew.-% Salz mit einer Korngröße von 0,16 - 0,7 mm 1,5 Gew.-% Borphosphat 1 Gew.-% Graphit97.5% by weight salt with a grain size of 0.16-0.7 mm 1.5% by weight boron phosphate 1% by weight graphite
wurden gepresst und wärmebehandelt. Es ergaben sich Zugfestigkeiten beiwere pressed and heat treated. There were tensile strengths
200°C von ca. 2,4 Kg, 300°C von ca. 2,5 Kg 400°C von ca. 2,5 Kg, 500°C von ca. 3 - 3,5 Kg.200 ° C of approx.2.4 kg, 300 ° C of approx.2.5 kg 400 ° C of approx.2.5 kg, 500 ° C of approx. 3 - 3.5 kg.
Versuch IIIExperiment III
97,5 Gew.-% Salz mit einer Korngröße von 0,16 - 0,7 mm 1,5 Gew.-% Natriumpolyphosphat 1 Gew.-% Graphit97.5% by weight salt with a grain size of 0.16-0.7 mm 1.5% by weight sodium polyphosphate 1% by weight graphite
wurden gepresst und wärmebehandelt. Es ergaben sich Zugfestigkeiten beiwere pressed and heat treated. There were tensile strengths
200°C von ca. 1,3 Kg, 300°C von ca. 1,4 Kg, 400°C von ca. 2 Kg, 500°C von ca. 4 Kg.200 ° C of approx. 1.3 kg, 300 ° C of approx. 1.4 kg, 400 ° C of approx. 2 kg, 500 ° C of approx. 4 kg.
Versuch IVExperiment IV
97,5 Gew.-% Salz mit einer Korngröße von 0,16 - 0,7 mm97.5% by weight of salt with a grain size of 0.16-0.7 mm
1,5 Gew.-% Borphosphat mit einem Anteil eines anorganischen Borats,1.5% by weight of boron phosphate with a proportion of an inorganic borate,
1 Gew.-% Graphit1% by weight graphite
wurden gepresst und wärmebehandelt. Es ergaben sich Zugfestigkeiten beiwere pressed and heat treated. There were tensile strengths
200°C von 1,5 Kg, 300°C von 1,75 Kg, 400°C von 2,5 bis 3 Kg, 500°C von 3 bis 4 Kg.200 ° C from 1.5 kg, 300 ° C from 1.75 kg, 400 ° C from 2.5 to 3 kg, 500 ° C from 3 to 4 kg.
Mit diesen Rezepturen kann auf den kostenaufwendigen Vorgang des Vowärmens in der Gießerei verzichtet werden, die Salzkerne können bei relativ niedrigen Temperaturen automatisch eingesetzt werden und ein Ausgasen findet nicht statt. Auch findet die Wärmebehandlung bei Temperaturen deutlich unter der Sintertemperatur (730° C) statt, was den Energiebedarf bei der Kernherstellung verringert. With these recipes, the costly process of pre-heating in the foundry can be dispensed with, the salt cores can be used automatically at relatively low temperatures and there is no outgassing. The heat treatment also takes place at temperatures significantly below the sintering temperature (730 ° C.), which reduces the energy requirement in the core production.

Claims

Ansprüche Expectations
1. Wasserlösliche Salzkeme, die durch Verdichten einer Mischung aus wasserlöslichen Salzen und einem Bindemittel unter Druck und anschließender Wärmebehandlung hergestellt werden, dadurch gekennzeichnet, dass das Bindemittel ein anorganisches Phosphat oder eine Mischung anorgani- scher Phosphate mit einem Anteil von zwischen 0,5 und 10 Gew.-% der Mischung ist.1. Water-soluble salt cores, which are prepared by compressing a mixture of water-soluble salts and a binder under pressure and subsequent heat treatment, characterized in that the binder is an inorganic phosphate or a mixture of inorganic phosphates with a proportion of between 0.5 and 10 % By weight of the mixture.
2. Wasserlösliche Salzkeme nach Anspruch 1, dadurch gekennzeichnet, dass das Bindemittel einen Anteil eines anorganischen Borats enthält.2. Water-soluble salt core according to claim 1, characterized in that the binder contains a proportion of an inorganic borate.
3. Wasserlösliche Salzkeme nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Mischung einen Anteil von zwischen >0 und 10 Gew.-% eines Trennmittels enthält.3. Water-soluble salt cores according to claim 1 or 2, characterized in that the mixture contains a proportion of between> 0 and 10 wt .-% of a release agent.
4. Wasserlösliche Salzkeme nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass das anorganische Phosphat ein Monoalumimumphosphat ist.4. Water-soluble salt core according to claim 1, 2 or 3, characterized in that the inorganic phosphate is a monoaluminum phosphate.
5. Wasserlösliche Salzkeme nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass das anorganische Phosphat ein Borphosphat ist. 5. Water-soluble salt core according to claim 1, 2 or 3, characterized in that the inorganic phosphate is a boron phosphate.
6. Wasserlösliche Salzkeme nach Anspruch 1, 2 oder 3, da furch gekennzeichnet, dass das anorganische Phosphat ein Natriumpolyphosphat ist.6. Water-soluble salt core according to claim 1, 2 or 3, characterized in that the inorganic phosphate is a sodium polyphosphate.
7. Wasserlösliche Salzkeme nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wärmebehandlung bei Temperaturen von unter 730°C erfolgt. 7. Water-soluble salt core according to one of the preceding claims, characterized in that the heat treatment is carried out at temperatures below 730 ° C.
EP04802923A 2003-12-17 2004-12-11 Water-soluble salt cores Not-in-force EP1691942B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10359547A DE10359547B3 (en) 2003-12-17 2003-12-17 Water soluble salt core prepared by compressing a mixture of water soluble salts and a binder under pressure and heating useful in casting operations
PCT/DE2004/002718 WO2005058527A1 (en) 2003-12-17 2004-12-11 Water-soluble salt cores

Publications (2)

Publication Number Publication Date
EP1691942A1 true EP1691942A1 (en) 2006-08-23
EP1691942B1 EP1691942B1 (en) 2011-05-11

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EP04802923A Not-in-force EP1691942B1 (en) 2003-12-17 2004-12-11 Water-soluble salt cores

Country Status (5)

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US (2) US20070036941A1 (en)
EP (1) EP1691942B1 (en)
AT (1) ATE508817T1 (en)
DE (1) DE10359547B3 (en)
WO (1) WO2005058527A1 (en)

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Also Published As

Publication number Publication date
US8403028B2 (en) 2013-03-26
EP1691942B1 (en) 2011-05-11
US20120132785A1 (en) 2012-05-31
DE10359547B3 (en) 2005-03-03
ATE508817T1 (en) 2011-05-15
US20070036941A1 (en) 2007-02-15
WO2005058527A1 (en) 2005-06-30

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