WO2005080022A2 - Water-soluble salt cores for die casting - Google Patents

Water-soluble salt cores for die casting Download PDF

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Publication number
WO2005080022A2
WO2005080022A2 PCT/DE2005/000272 DE2005000272W WO2005080022A2 WO 2005080022 A2 WO2005080022 A2 WO 2005080022A2 DE 2005000272 W DE2005000272 W DE 2005000272W WO 2005080022 A2 WO2005080022 A2 WO 2005080022A2
Authority
WO
WIPO (PCT)
Prior art keywords
parts
weight
water
salt
die casting
Prior art date
Application number
PCT/DE2005/000272
Other languages
German (de)
French (fr)
Other versions
WO2005080022A3 (en
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
Priority claimed from DE102004038288A external-priority patent/DE102004038288A1/en
Application filed by Emil Müller GmbH filed Critical Emil Müller GmbH
Priority to US10/589,629 priority Critical patent/US20080035294A1/en
Priority to EP05714987A priority patent/EP1715970A2/en
Priority to DE112005000950T priority patent/DE112005000950A5/en
Publication of WO2005080022A2 publication Critical patent/WO2005080022A2/en
Publication of WO2005080022A3 publication Critical patent/WO2005080022A3/en

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

Definitions

  • the present invention relates to water-soluble salt cores for die casting with the features of the preamble of claim 1.
  • 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.
  • Such salt cores were used in the past for permanent mold casting. These salt cores could not withstand die casting. Instead, sand cores have been used here for decades, most of which are made with binders containing phenol and furan. Since this technology is based on the processing of environmentally harmful substances, it is classified as critical and requires considerable, costly protective measures. There is therefore a need for environmentally friendly, e.g. salt-based cores for the die casting process
  • the object of the present invention is to provide a method for producing a salt core for die casting which produces salt cores which meet the requirements of die casting and which are produced from components which do not contain any environmentally harmful components.
  • water-soluble salt cores for die casting which are produced by compressing a mixture of water-soluble salts under pressure and then sintering 0.5 to 2 parts by weight of graphite or talc come, characterized in that the compression takes place under a pressure of between 300 and 900 N / mm 2 .
  • the pressed salt cores are sintered at 650 - 730 ° C between 1 / 2h and 2h.
  • This mixture is subjected to a pressure of 700 N / mm 2 and at 720 °
  • the salt core is suitable for die casting.

Landscapes

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

Abstract

The invention relates to water-soluble salt cores for die casting, said salt cores being produced by compressing, and then sintering, a mixture of water-soluble salts. According to the invention, there are between 4 and 5 parts by weight of borax, between 2 and 3 parts by weight of magnesium, and between 0.5 and 2 parts by weight of graphite or talc, in the mixture, for 100 parts by weight of salt. The compression is carried out under a pressure of between 300 and 900 N/mm2.

Description

Wasserlösliche Salzkerne für den DruckgussWater soluble salt cores for die casting
Beschreibungdescription
Die vorliegende Erfindung betrifft wasserlösliche Salzkerne für den Druckguss mit den Merkmalen des Oberbegriffs des Anspruchs 1.The present invention relates to water-soluble salt cores for die casting 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. Solche Salzkerne wurden in der Vergangenheit beim Kokillenguss eingesetzt. Dem Druckguss hielten diese Salzkerne nicht stand. Statt dessen werden hier seit Jahrzehnten Sandkerne eingesetzt, die überwiegend mit phenol- und fu- ranhaltigen Bindemitteln hergestellt werden. Da diese Technologie auf der Verarbeitung umweltschädlicher Stoffe beruht, wird sie als kritisch eingestuft und erfordert erhebliche, kostenträchtige Schutzmaßnahmen. Es besteht daher ein Bedarf an umweltfreundlichen, z.B. auf Salz beruhenden Kernen für das Druckguss- verfahrenSuch 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. Such salt cores were used in the past for permanent mold casting. These salt cores could not withstand die casting. Instead, sand cores have been used here for decades, most of which are made with binders containing phenol and furan. Since this technology is based on the processing of environmentally harmful substances, it is classified as critical and requires considerable, costly protective measures. There is therefore a need for environmentally friendly, e.g. salt-based cores for the die casting process
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zur Herstellung eines Salzkerns für den Druckguss zu schaffen, das Salzkerne ergibt, die den Anforderungen des Druckgusses genügen und die aus Bestandteilen hergestellt sind, die keine umweltschädlichen Komponenten beinhalten.The object of the present invention is to provide a method for producing a salt core for die casting which produces salt cores which meet the requirements of die casting and which are produced from components which do not contain any environmentally harmful components.
Diese Aufgabe wird mit den in Anspruch 1 genannten Merkmalen gelöst. Erfindungsgemäß sind wasserlösliche Salzkerne für den Druckguss, die durch Verdichten einer Mischung aus wasserlöslichen Salzen unter Druck und anschließendem Sintern hergestellt werden, wobei bei der bei der Mischung auf 100 Ge- wichtsteile Salz zwischen 4 und 5 Gewichtsteile Borax, zwischen 2 und 3 Gewichtsteile Magnesium und 0,5 bis 2 Gewichtsanteile Graphit oder Talkum kommen, dadurch gekennzeichnet, dass die Verdichtung unter einem Druck von zwischen 300 und 900 N/mm2 erfolgt. Überraschender Weise hat sich ergeben, dass eine solche an sich bekannte Mischung durch den sehr hohen Pressdruck Eigen- Schäften entwickelt, die sie für den Druckguss tauglich machen. Das Sintern der gepressten Salzkerne wird bei 650 - 730° C zwischen Vz Std. und 2 Std. durchgeführt.This object is achieved with the features mentioned in claim 1. According to the invention are water-soluble salt cores for die casting, which are produced by compressing a mixture of water-soluble salts under pressure and then sintering 0.5 to 2 parts by weight of graphite or talc come, characterized in that the compression takes place under a pressure of between 300 and 900 N / mm 2 . Surprisingly, it has been found that such a mixture, which is known per se, develops inherent shafts due to the very high pressing pressure which make it suitable for die casting. The pressed salt cores are sintered at 650 - 730 ° C between 1 / 2h and 2h.
Ein erfindungsgemäßes Verfahren zur Herstellung von wasserlöslichen Salzker- nen, ist gekennzeichnet durch die Schritte:A method according to the invention for producing water-soluble salt cores is characterized by the steps:
- Bereitstellen einer Mischung aus 100 Gewichtsteile Salz, zwischen 4 und 5 Gewichtsteile Borax, zwischen 2 und 3 Gewichtsteile Magnesium und 0,5 bis 2 Gewichtsanteile Graphit oder Talkum,Provision of a mixture of 100 parts by weight of salt, between 4 and 5 parts by weight of borax, between 2 and 3 parts by weight of magnesium and 0.5 to 2 parts by weight of graphite or talc,
- Verdichtung der Mischung in einer Presse unter einem Druck von zwischen 300 und 900 N/mm2,Compression of the mixture in a press under a pressure of between 300 and 900 N / mm 2 ,
- Sintern der gepressten Salzkerne bei 650 - 730° C zwischen '/_. Std. und 2 Std.- Sintering the pressed salt cores at 650 - 730 ° C between '/ _. Hours and 2 hours
Im Folgenden wird die Erfindung anhand von Rezepturen rein beispielhaft näher dargestellt.In the following, the invention is illustrated in more detail purely by way of example using recipes.
Mischung IMixture I
100 kg Salz100 kg of salt
4.6 kg Borax 2,6 kg Magnesium4.6 kg borax 2.6 kg magnesium
1.7 kg Graphit1.7 kg graphite
Diese Mischung wird einem Pressdruck von 600 N/mm2 unterworfen und bei 700° C gesintert. Der Salzkern ist für den Druckguss geeignet. Mischung IIThis 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. Mixture II
100 kg Salz100 kg of salt
4,6 kg Borax4.6 kg borax
2,6 kg Magnesium2.6 kg magnesium
0,8 kg Talkum0.8 kg talc
Diese Mischung wird einem Pressdruck von 700 N/mm2 unterworfen und bei 720°This mixture is subjected to a pressure of 700 N / mm 2 and at 720 °
C gesintert. Der Salzkern ist für den Druckguss geeignet. C sintered. The salt core is suitable for die casting.

Claims

Ansprüche Expectations
1. Wasserlösliche Salzkerne für den Druckguss, die durch Verdichten einer Mischung aus wasserlöslichen Salzen unter Druck und anschließendem Sintern hergestellt werden, wobei bei der bei der Mischung auf 100 Gewichtsteile Salz zwischen 4 und 5 Gewichtsteile Borax, zwischen 2 und 3 Gewichtsteile Magnesium und 0,5 bis 2 Ge- wichtsanteile Graphit oder Talkum kommen, dadurch gekennzeichnet, dass die Verdichtung unter einem Druck von zwischen 300 und 900 N/mm2 erfolgt.1.Water-soluble salt cores for die casting, which are produced by compressing a mixture of water-soluble salts under pressure and then sintering, wherein when mixed to 100 parts by weight of salt between 4 and 5 parts by weight of borax, between 2 and 3 parts by weight of magnesium and 0, 5 to 2 parts by weight of graphite or talc come, characterized in that the compression takes place under a pressure of between 300 and 900 N / mm 2 .
2. Wasserlösliche Salzkerne nach Anspruch 1, dadurch gekennzeichnet, dass das Sintern der gepressten Salzkerne bei 650 - 730° C zwischen lA Std. und 2 Std. durchgeführt wird.2. Water-soluble salt cores according to claim 1, characterized in that the sintering of the pressed salt cores is carried out at 650-730 ° C between 1 A hours and 2 hours.
3. Verfahren zur Herstellung von wasserlöslichen Salzkernen, gekennzeichnet durch die Schritte:3. Process for the production of water-soluble salt cores, characterized by the steps:
- Bereitstellen einer Mischung aus 100 Gewichtsteile Salz, zwischen 4 und 5 Gewichtsteile Borax, zwischen 2 und 3 Gewichtsteile Magnesium und 0,5 bis 2 Gewichtsanteile Graphit oder Talkum, - Verdichtung der Mischung in einer Presse unter einem Druck von zwischen 300 und 900 N/mm2,Provision of a mixture of 100 parts by weight of salt, between 4 and 5 parts by weight of borax, between 2 and 3 parts by weight of magnesium and 0.5 to 2 parts by weight of graphite or talc, compression of the mixture in a press under a pressure of between 300 and 900 N / mm 2 ,
- Sintern der gepressten Salzkerne bei 650 - 730° C zwischen lΛ Std. und 2 Std. - Sintering the pressed salt cores at 650 - 730 ° C between l Λ hours and 2 hours
PCT/DE2005/000272 2004-02-19 2005-02-17 Water-soluble salt cores for die casting WO2005080022A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/589,629 US20080035294A1 (en) 2004-02-19 2005-02-17 Water-Soluble Salt Cores for Die Casting
EP05714987A EP1715970A2 (en) 2004-02-19 2005-02-17 Water-soluble salt cores for die casting
DE112005000950T DE112005000950A5 (en) 2004-02-19 2005-02-17 Water soluble salt cores for die casting

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102004008096.8 2004-02-19
DE102004038288.3 2004-02-19
DE102004008096 2004-02-19
DE102004038288A DE102004038288A1 (en) 2004-02-19 2004-08-06 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

Publications (2)

Publication Number Publication Date
WO2005080022A2 true WO2005080022A2 (en) 2005-09-01
WO2005080022A3 WO2005080022A3 (en) 2006-03-02

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PCT/DE2005/000272 WO2005080022A2 (en) 2004-02-19 2005-02-17 Water-soluble salt cores for die casting

Country Status (4)

Country Link
US (1) US20080035294A1 (en)
EP (1) EP1715970A2 (en)
DE (1) DE112005000950A5 (en)
WO (1) WO2005080022A2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111156A1 (en) * 2005-04-21 2006-10-26 Emil Müller GmbH Water-soluble salt grains
CN1314498C (en) * 2005-09-12 2007-05-09 华南理工大学 Soluble salt core for extrusion casting and its making process
DE102007009274A1 (en) 2007-02-26 2008-08-28 Daimler Ag Salt cores for die casting, light metal components consist of compressed, optionally sintered, alkali metal or alkaline earth metal salts and contain smaller proportion of finely divided carbonates which are decomposed by acids
DE102008039208A1 (en) 2008-08-20 2009-02-12 Heppes, Frank, Dipl.-Ing. Core for use in prototyping, especially for pressure casting or powder metallurgy, is obtained using metal sheath, molding material, mechanical shaping device and high pressure compression tube
WO2013152851A3 (en) * 2012-04-10 2014-03-20 Emil Müller GmbH Salt-based cores, method for the production thereof and use thereof
DE102012022390B3 (en) * 2012-11-15 2014-04-03 Audi Ag Preparing a salt core for the formation of cavities in a light-metal die-casting, comprises introducing a paste-like salt-liquid mixture into cavity of compression mold, and compressing the mixture to expel fluid contained in the mixture

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104399865B (en) * 2014-12-01 2016-08-24 湖南江滨机器（集团）有限责任公司 A kind of water-soluble graphite complex salt core material, graphite complex salt core and preparation method thereof
JP6914783B2 (en) * 2017-08-31 2021-08-04 ローレルバンクマシン株式会社 Goods management device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1924991A1 (en) * 1969-05-16 1970-11-19 Schmidt Gmbh Karl Core for foundry purposes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483641C3 (en) * 1965-06-12 1973-10-11 Karl Schmidt Gmbh, 7107 Neckarsulm Water-soluble salt cores
US3963818A (en) * 1971-10-29 1976-06-15 Toyo Kogyo Co., Ltd. Water soluble core for pressure die casting and process for making the same
US3968828A (en) * 1973-11-14 1976-07-13 Ashland Oil, Inc. Method of casting non-ferrous alloys

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1924991A1 (en) * 1969-05-16 1970-11-19 Schmidt Gmbh Karl Core for foundry purposes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1715970A2 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111156A1 (en) * 2005-04-21 2006-10-26 Emil Müller GmbH Water-soluble salt grains
CN1314498C (en) * 2005-09-12 2007-05-09 华南理工大学 Soluble salt core for extrusion casting and its making process
DE102007009274A1 (en) 2007-02-26 2008-08-28 Daimler Ag Salt cores for die casting, light metal components consist of compressed, optionally sintered, alkali metal or alkaline earth metal salts and contain smaller proportion of finely divided carbonates which are decomposed by acids
DE102008039208A1 (en) 2008-08-20 2009-02-12 Heppes, Frank, Dipl.-Ing. Core for use in prototyping, especially for pressure casting or powder metallurgy, is obtained using metal sheath, molding material, mechanical shaping device and high pressure compression tube
WO2013152851A3 (en) * 2012-04-10 2014-03-20 Emil Müller GmbH Salt-based cores, method for the production thereof and use thereof
DE102012022390B3 (en) * 2012-11-15 2014-04-03 Audi Ag Preparing a salt core for the formation of cavities in a light-metal die-casting, comprises introducing a paste-like salt-liquid mixture into cavity of compression mold, and compressing the mixture to expel fluid contained in the mixture

Also Published As

Publication number Publication date
DE112005000950A5 (en) 2007-05-24
US20080035294A1 (en) 2008-02-14
EP1715970A2 (en) 2006-11-02
WO2005080022A3 (en) 2006-03-02

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