EP1715970A2 - Water-soluble salt cores for die casting - Google Patents
Water-soluble salt cores for die castingInfo
- Publication number
- EP1715970A2 EP1715970A2 EP05714987A EP05714987A EP1715970A2 EP 1715970 A2 EP1715970 A2 EP 1715970A2 EP 05714987 A EP05714987 A EP 05714987A EP 05714987 A EP05714987 A EP 05714987A EP 1715970 A2 EP1715970 A2 EP 1715970A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- parts
- weight
- water
- salt
- die casting
- 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- Withdrawn
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
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
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| PCT/DE2005/000272 WO2005080022A2 (en) | 2004-02-19 | 2005-02-17 | Water-soluble salt cores for die casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1715970A2 true EP1715970A2 (en) | 2006-11-02 |
Family
ID=34888796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05714987A Withdrawn EP1715970A2 (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) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005018614B4 (en) * | 2005-04-21 | 2016-07-28 | Emil Müller GmbH | Process for the preparation of water-soluble salt cores |
| 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 |
| EP2836318A2 (en) * | 2012-04-10 | 2015-02-18 | 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 |
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1483641A1 (en) * | 1965-06-12 | 1969-02-27 | Schmidt Gmbh Karl | Method for casting cavities |
| GB1274966A (en) * | 1969-05-16 | 1972-05-17 | Schmidt Gmbh Karl | Core for use in foundries and a method of forming cavities in castings |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2005
- 2005-02-17 US US10/589,629 patent/US20080035294A1/en not_active Abandoned
- 2005-02-17 EP EP05714987A patent/EP1715970A2/en not_active Withdrawn
- 2005-02-17 DE DE112005000950T patent/DE112005000950A5/en not_active Withdrawn
- 2005-02-17 WO PCT/DE2005/000272 patent/WO2005080022A2/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1483641A1 (en) * | 1965-06-12 | 1969-02-27 | Schmidt Gmbh Karl | Method for casting cavities |
| GB1274966A (en) * | 1969-05-16 | 1972-05-17 | Schmidt Gmbh Karl | Core for use in foundries and a method of forming cavities in castings |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005080022A3 (en) | 2006-03-02 |
| WO2005080022A2 (en) | 2005-09-01 |
| DE112005000950A5 (en) | 2007-05-24 |
| US20080035294A1 (en) | 2008-02-14 |
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| DAX | Request for extension of the european patent (deleted) | ||
| 17Q | First examination report despatched |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 20091215 |