EP0945200A1 - Casting mould and process for its production - Google Patents
Casting mould and process for its production Download PDFInfo
- Publication number
- EP0945200A1 EP0945200A1 EP98123690A EP98123690A EP0945200A1 EP 0945200 A1 EP0945200 A1 EP 0945200A1 EP 98123690 A EP98123690 A EP 98123690A EP 98123690 A EP98123690 A EP 98123690A EP 0945200 A1 EP0945200 A1 EP 0945200A1
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- European Patent Office
- Prior art keywords
- molding material
- binder
- molding
- weight
- mold
- 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.)
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Classifications
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- 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
Definitions
- the invention relates to a method for producing Casting molds for metal casting by molding a model with a free-flowing using a water-based binder setable molding material and one according to the process manufactured mold.
- the foundries are pourable in the metal foundries and mechanically solidifiable substances used, whereby before especially the easy and cheap to produce molding sand Scope used.
- a binder e.g. B. sound, which Water is added.
- Such a molding material is not only cheap, but also has little or no impact on the environment also simple and easy to prepare after use and reuse with it.
- the invention has for its object a method of type described at the outset so that a Casting mold can be produced from a molding material, on the one hand is easy to shape and easy to reprocess and on the other hand has a high thermal conductivity, the one ensures rapid cooling of the casting.
- This object is achieved in that as Molding material with a granulate made of a metallic material a grain size of 0.01 to 2 mm is used, the 1 to 20% by weight of the binder is added, the molding material then into a mold box containing a model plate filled and the filled molding material in the molding box is compressed.
- the molding material according to the invention advantageously consists of Aluminum, which is not only high thermal conductivity, but also a relatively low specific one Has weight so that the mold as such is light remains manageable.
- the metallic granulate becomes advantageous bound with a clay / water mixture, whereby here a clay / water mixture of 5 wt.% each as advantageous has highlighted.
- a molded material prepared in this way remains free-flowing so that it is poured into the molding box can be. Then the molding material is in Compressed in the usual way so that a dimensionally stable shape which is advantageous for casting engine blocks or similar parts is suitable.
- the thermal conductivity of the molding material can be caused by the choice of granules and on the other hand by adding Quartz, zircon etc. can be set in a wide range, so that the desired cooling rate in the casting is obtained.
- Molding material can cool down by 20% to 40%, respectively reduced after setting and choosing the metallic granules become. This makes it possible to compare one to produce fine-grained cast structure to conventional sand molds.
- Curve 1 shows a mold shape.
- the Curves 2 and 3 a casting mold made of zircon sand or quartz sand and curve 4 a mold in which the granules made of aluminum with a grain size of approx. 0.3 mm. From the illustration it can be seen that with a cast in a mold the cooling of the melt due to the large Heat capacity of the mold runs very quickly, whereby the solidification process, which is completed at about 480 ° C is done within a minute. The cooling behavior in a conventional zircon or Quartz sand mold lasts considerably longer than with permanent mold casting and is over seven minutes. In an inventive Casting mold with a molding sand with a granulate Aluminum with a grain size of 0.3 mm becomes the same Degree of cooling reached in less than five minutes, so that there is a much more fine-grained structure here.
- the invention ensures on the one hand that the so prepared Casting cast made cooled in a short time is, on the other hand, ensures that the manufacturing cost not bigger for such a mold is more essential than with conventional sand molds bring worse cooling behavior with it.
- the compression of the molding material in the mold takes place on best that the molding material in the mold is pneumatic or mechanically, for example by means of one of one Press actuated stamp is compressed.
- a special one good impression of the model can be achieved that the molding material pneumatically and mechanically is densified.
- carbon can be buried.
- Also can be used for control metallic oxides are added to the thermal conductivity be, for example iron oxide.
- Casting mold depends on the molding material used Also suitable for higher melting casting compounds and after easy to recycle their use.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Gießformen für den Metallguß durch Abformen eines Modells mit einem rieselfähigen mittels eines wasserhaltigen Bindemittels abbindbaren Formstoffes sowie eine nach dem Verfahren hergestellte Gießform.The invention relates to a method for producing Casting molds for metal casting by molding a model with a free-flowing using a water-based binder setable molding material and one according to the process manufactured mold.
Als Formstoffe werden in den Metallgießereien schüttbare und mechanisch verfestigbare Stoffe verwendet, wobei vor allem die leicht und billig herstellbaren Formsande in weitem Umfang zum Einsatz gelangen. Hierzu werden in der Regel reine oder verschnittene Quarzsände oder -mehle verwendet, die mit einem Bindemittel versetzt werden, z. B. Ton, welchem Wasser zugesetzt ist. Ein solcher Formstoff ist nicht nur billig, sondern belastet auch die Umwelt kaum und ist auch außerdem nach seinem Gebrauch einfach und leicht aufzubereiten und damit wiederzuverwenden.The foundries are pourable in the metal foundries and mechanically solidifiable substances used, whereby before especially the easy and cheap to produce molding sand Scope used. This usually happens used pure or blended quartz sands or flours, which are mixed with a binder, e.g. B. sound, which Water is added. Such a molding material is not only cheap, but also has little or no impact on the environment also simple and easy to prepare after use and reuse with it.
Die Problematik bei derartigen Formstoffen besteht darin, daß die Abkühlgeschwindigkeit des Gußstückes aufgrund der doch relativ schlechten Wärmeleitfähigkeit des Formsandes nicht allzu schnell verläuft, so daß kein ausreichend feinkörniges Gefüge erzielt werden kann. Dies gilt insbesondere dann, wenn großvolumige Gußstücke abgegossen werden. Für die Erzielung einer schnelleren Abkühlgeschwindigkeit wurden bisher immer Dauerformen verwendet, welche jedoch aufwendig in der Herstellung sind.The problem with such molded materials is that that the cooling rate of the casting due to the but relatively poor thermal conductivity of the molding sand does not run too quickly, so that it is not sufficiently fine-grained Microstructure can be achieved. This is especially true when large-volume castings are poured. For achieving a faster cooling rate So far, permanent forms have always been used, but these are complex are in the making.
Es ist deshalb bereits versucht worden, für solche Gußstücke einen Formsand zu verwenden, der aus einem mit einem Zirkonsand verschnittenen Quarzsand oder -mehl hergestellt ist oder auch aus einem Zirkonsand allein besteht und mit einem zugesetzten, geeigneten chemischen Bindemittel abgebunden wird. Die Wärmeleitfähigkeit wird hierdurch zwar etwas verbessert und auch die Warmfestigkeit wird erhöht, so daß hier auch höher schmelzende Metalle problemloser abgegossen werden können. Der Nachteil dieser chemisch gebundenen Sände besteht darin, daß die Aufbereitung teuer ist, zumal hier komplizierte und teure Regenerierungsanlagen und -verfahren benutzt werden müssen.It has therefore already been attempted for such castings to use molding sand made from one with one Zircon sand blended quartz sand or flour is or also consists of a zircon sand alone and with an added, suitable chemical binder becomes. This does make the thermal conductivity somewhat improved and the heat resistance is increased, too that even higher melting metals are poured off more easily can be. The disadvantage of this chemically bound Sands is that the preparation is expensive, especially here complicated and expensive regeneration plants and procedures must be used.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs näher bezeichneten Art so auszugestalten, daß eine Gießform aus einem Formstoff herstellbar ist, der einerseits gut formbar und leicht wiederaufbereitbar ist und andererseits eine hohe Wärmeleitfähigkeit aufweist, die eine schnelle Abkühlung des Gußstückes gewährleistet.The invention has for its object a method of type described at the outset so that a Casting mold can be produced from a molding material, on the one hand is easy to shape and easy to reprocess and on the other hand has a high thermal conductivity, the one ensures rapid cooling of the casting.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß als Formstoff ein Granulat aus einem metallischen Werkstoff mit einer Korngröße von 0,01 bis 2 mm verwendet wird, dem 1 bis 20 Gew.% des Bindemittels beigemischt ist, der Formstoff anschließend in einen eine Modellplatte enthaltenden Formkasten eingefüllt und der verfüllte Formstoff in dem Formkasten verdichtet wird.This object is achieved in that as Molding material with a granulate made of a metallic material a grain size of 0.01 to 2 mm is used, the 1 to 20% by weight of the binder is added, the molding material then into a mold box containing a model plate filled and the filled molding material in the molding box is compressed.
Der Formstoff gemäß der Erfindung besteht vorteilhaft aus Aluminium, was nicht nur eine hohe Wärmeleitfähigkeit, sondern darüber hinaus auch noch ein relativ geringes spezifisches Gewicht hat, so daß die Gießform als solche leicht handhabbar bleibt. Das metallische Granulat wird vorteilhaft mit einem Ton-/Wassergemisch gebunden, wobei sich hier ein Ton-/Wassergemisch von jeweils 5 Gew.% als vorteilhaft herausgestellt hat. Ein derart aufbereiteter Formstoff bleibt rieselfähig, so daß dieser in den Formkasten geschüttet werden kann. Anschließend wird der Formstoff in üblicher Weise verdichtet, so daß eine formstabile Form erhalten wird, welche vorteilhaft für das Abgießen von Motorblöcken oder ähnlichen Teilen geeignet ist.The molding material according to the invention advantageously consists of Aluminum, which is not only high thermal conductivity, but also a relatively low specific one Has weight so that the mold as such is light remains manageable. The metallic granulate becomes advantageous bound with a clay / water mixture, whereby here a clay / water mixture of 5 wt.% each as advantageous has highlighted. A molded material prepared in this way remains free-flowing so that it is poured into the molding box can be. Then the molding material is in Compressed in the usual way so that a dimensionally stable shape which is advantageous for casting engine blocks or similar parts is suitable.
Die Wärmeleitfähigkeit des Formstoffes kann zum einen durch die Wahl des Granulates und zum anderen durch Zugabe von Quarz, Zirkon etc. in einem weiten Rahmen eingestellt werden, so daß die gewünschte Abkühlgeschwindigkeit im Gußstück erhalten wird. Durch die Verwendung des erfindungsgemäßen Formstoffes kann die Abkühlzeit um 20 % bis 40 %, je nach Einstellung und Wahl des metallischen Granulates verringert werden. Hierdurch ist es möglich, ein im Vergleich zu herkömmlichen Sandformen feinkörniges Gußgefüge zu erzeugen.The thermal conductivity of the molding material can be caused by the choice of granules and on the other hand by adding Quartz, zircon etc. can be set in a wide range, so that the desired cooling rate in the casting is obtained. By using the invention Molding material can cool down by 20% to 40%, respectively reduced after setting and choosing the metallic granules become. This makes it possible to compare one to produce fine-grained cast structure to conventional sand molds.
In der beigefügten graphischen Darstellung ist die Temperatur
des Gußstückes nach dem Eingießen in Abhängigkeit der
Zeit dargestellt. Die Kurve 1 zeigt eine Kokillenform. Die
Kurve 2 und 3 eine Gießform aus Zirkonsand bzw. aus Quarzsand
und die Kurve 4 eine Gießform, bei der das Granulat
aus Aluminium mit einer Korngröße von ca. 0,3 mm besteht.
Aus der Abbildung ist ersichtlich, daß bei einem Abguß in
einer Kokille die Abkühlung der Schmelze aufgrund der großen
Wärmekapazität der Kokille sehr rasch verläuft, wobei
der Erstarrungsvorgang, der bei ca. 480°C abgeschlossen
ist, bereits innerhalb einer Minute erfolgt ist. Das Abkühlungsverhalten
in einer herkömmlichen Zirkon- oder
Quarzsandform dauert erheblich länger als beim Kokillenguß
und beträgt über sieben Minuten. Bei einer erfindungsgemäßen
Gießform mit einem Formsand mit einem Granulat aus
Aluminium mit einer Korngröße von 0,3 mm wird der gleiche
Abkühlungsgrad in weniger als fünf Minuten erreicht, so daß
sich hier ein wesentlich feinkörnigeres Gefüge einstellt.In the attached graph, the temperature is
of the casting after pouring depending on the
Time shown.
Die Erfindung sichert einerseits, daß der in einer so vorbereiteten Gießform vorgenommene Abguß in kurzer Zeit abgekühlt ist, gewährleistet andererseits jedoch, daß der Herstellungsaufwand für eine derartige Gießform nicht größer ist als bei herkömmlichen Sandgußformen, die ein wesentlich schlechteres Abkühlverhalten mit sich bringen.The invention ensures on the one hand that the so prepared Casting cast made cooled in a short time is, on the other hand, ensures that the manufacturing cost not bigger for such a mold is more essential than with conventional sand molds bring worse cooling behavior with it.
Die Verdichtung des Formstoffes in der Gießform erfolgt am besten dadurch, daß der Formstoff in der Gießform pneumatisch oder mechanisch, beispielsweise mittels eines von einer Presse betätigten Stempels verdichtet wird. Eine besonders gute Abformung des Modells kann dadurch erreicht werden, daß der Formstoff pneumatisch vor- und mechanisch nachverdichtet wird. Zur Verbesserung der Oberflächengüte kann Kohlenstoff beigesetzt werden. Auch können zur Steuerung der Wärmeleitfähigkeit metallische Oxyde beigegeben werden, beispielsweise Eisenoxyd.The compression of the molding material in the mold takes place on best that the molding material in the mold is pneumatic or mechanically, for example by means of one of one Press actuated stamp is compressed. A special one good impression of the model can be achieved that the molding material pneumatically and mechanically is densified. To improve the surface quality carbon can be buried. Also can be used for control metallic oxides are added to the thermal conductivity be, for example iron oxide.
Eine nach dem erfindungsgemäßen Verfahren hergestellte Gießform ist in Abhängigkeit des eingesetzten Formstoffes auch für höher schmelzende Gießmassen gut geeignet und nach ihrem Gebrauch einfach wieder aufzubereiten.A manufactured by the method according to the invention Casting mold depends on the molding material used Also suitable for higher melting casting compounds and after easy to recycle their use.
Claims (12)
dadurch gekennzeichnet, daß
als Formstoff ein Granulat aus einem metallischen Werkstoff mit einer Korngröße von 0,01 bis 2 mm verwendet wird, dem 1 bis 20 Gew.% des Bindemittels beigemischt ist, der Formstoff anschließend in einen eine Modellplatte enthaltenden Formkasten eingefüllt und der verfüllte Formstoff in dem Formkasten verdichtet wird.Process for the production of casting molds for metal casting by molding a model with a free-flowing molding material that can be set using a water-containing binder,
characterized in that
a granulate made of a metallic material with a grain size of 0.01 to 2 mm is used as the molding material, to which 1 to 20% by weight of the binder is mixed, the molding material is then poured into a molding box containing a model plate and the filled molding material in the molding box is compressed.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19813847 | 1998-03-27 | ||
DE1998113847 DE19813847A1 (en) | 1998-03-27 | 1998-03-27 | Casting mold and process for its manufacture |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0945200A1 true EP0945200A1 (en) | 1999-09-29 |
Family
ID=7862732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98123690A Withdrawn EP0945200A1 (en) | 1998-03-27 | 1998-12-12 | Casting mould and process for its production |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0945200A1 (en) |
DE (1) | DE19813847A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1216771A2 (en) * | 2000-11-28 | 2002-06-26 | Dr.Ing. h.c.F. Porsche Aktiengesellschaft | Inserted core for producing a casting mould and process for the production of such casting mould |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014110826A1 (en) * | 2014-07-30 | 2016-02-04 | Fritz Winter Eisengiesserei Gmbh & Co. Kg | Method for casting castings |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5581041A (en) * | 1978-12-12 | 1980-06-18 | Sintokogio Ltd | Mold molding method |
JPS5650755A (en) * | 1979-09-28 | 1981-05-08 | Honda Motor Co Ltd | Mold for production of aulminum alloy casting |
JPS61293624A (en) * | 1985-06-21 | 1986-12-24 | Aisin Takaoka Ltd | Casting mold material |
JPS63140739A (en) * | 1986-12-02 | 1988-06-13 | Daido Steel Co Ltd | Mold |
JPH08229631A (en) * | 1995-02-23 | 1996-09-10 | Mitsubishi Heavy Ind Ltd | Casting mold for copper alloy |
US5722038A (en) * | 1989-09-15 | 1998-02-24 | Mclaughlin; Timothy M. | Mold element construction and related method |
-
1998
- 1998-03-27 DE DE1998113847 patent/DE19813847A1/en not_active Withdrawn
- 1998-12-12 EP EP98123690A patent/EP0945200A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5581041A (en) * | 1978-12-12 | 1980-06-18 | Sintokogio Ltd | Mold molding method |
JPS5650755A (en) * | 1979-09-28 | 1981-05-08 | Honda Motor Co Ltd | Mold for production of aulminum alloy casting |
JPS61293624A (en) * | 1985-06-21 | 1986-12-24 | Aisin Takaoka Ltd | Casting mold material |
JPS63140739A (en) * | 1986-12-02 | 1988-06-13 | Daido Steel Co Ltd | Mold |
US5722038A (en) * | 1989-09-15 | 1998-02-24 | Mclaughlin; Timothy M. | Mold element construction and related method |
JPH08229631A (en) * | 1995-02-23 | 1996-09-10 | Mitsubishi Heavy Ind Ltd | Casting mold for copper alloy |
Non-Patent Citations (5)
Title |
---|
DATABASE WPI Section Ch Week 8706, Derwent World Patents Index; Class A28, AN 87-039096, XP002110132 * |
PATENT ABSTRACTS OF JAPAN vol. 004, no. 123 (M - 029) 30 August 1980 (1980-08-30) * |
PATENT ABSTRACTS OF JAPAN vol. 005, no. 108 (M - 078) 14 July 1981 (1981-07-14) * |
PATENT ABSTRACTS OF JAPAN vol. 012, no. 392 (M - 755) 19 October 1988 (1988-10-19) * |
PATENT ABSTRACTS OF JAPAN vol. 097, no. 001 31 January 1997 (1997-01-31) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1216771A2 (en) * | 2000-11-28 | 2002-06-26 | Dr.Ing. h.c.F. Porsche Aktiengesellschaft | Inserted core for producing a casting mould and process for the production of such casting mould |
EP1216771A3 (en) * | 2000-11-28 | 2006-10-04 | Dr.Ing. h.c.F. Porsche Aktiengesellschaft | Inserted core for producing a casting mould and process for the production of such casting mould |
Also Published As
Publication number | Publication date |
---|---|
DE19813847A1 (en) | 1999-09-30 |
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