EP1525929A1 - Formmassenzusammensetzung - Google Patents
Formmassenzusammensetzung Download PDFInfo
- Publication number
- EP1525929A1 EP1525929A1 EP04015692A EP04015692A EP1525929A1 EP 1525929 A1 EP1525929 A1 EP 1525929A1 EP 04015692 A EP04015692 A EP 04015692A EP 04015692 A EP04015692 A EP 04015692A EP 1525929 A1 EP1525929 A1 EP 1525929A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molding composition
- aluminum
- composition according
- granules
- production
- 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
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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
-
- 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
Definitions
- the invention relates to a molding composition for Production of molds from a metal granulate and an inorganic one Binder, wherein the metal granules of aluminum or a Aluminum alloy is formed.
- Molds out Metal has the advantage of higher thermal conductivity but the disadvantage higher production costs. Mixtures of sand and binder are cost-effective, especially for smaller quantities of castings, wise but a significantly poorer thermal conductivity. As a result, the Molded parts in the cooling phase after casting a different temperature-time profile run through. The slower cooling leads, especially at high Wall thicknesses of cast parts to poorer mechanical properties.
- the molding compound is composed of Metal granules, preferably aluminum or aluminum alloys and the Binder is preferably synthetic resin. At casting temperatures above 400 ° C arise from the resin substances that are hazardous to the environment and the Represent employees.
- a Specify molding composition which is easy to produce, a good Has thermal conductivity and is optimally compatible with the environment.
- the Molding compound should in the production, casting, unpacking and in the Reprocessing none for the environment and for the health of the Foundry workers release dangerous substances.
- Magnesium (II) sulfate has a high and rising Temperature is a continuously higher solubility, so with highly concentrated Salt water solutions can be worked. Also when unpacking the Molded parts can use a lot of binder from the molding compound with little water be dissolved. The plant for the molding material preparation can be made smaller become.
- moldings are made of aluminum which can not absorb hydrogen during casting. This will achieved in that the molding composition to at least 98 wt.% From Aluminum granules and the remainder formed from anhydrous magnesium sulfate is.
- FIG 1 the thermal conductivity and the thermal diffusivity of three various compositions for the production of molds shown.
- SK the use of a steel mold is indicated.
- QS a mold of quartz sand and with A a casting mold of 98 wt.% aluminum granules with 2 % By weight of magnesium sulfate as a binder.
- the casting mold made of aluminum granules has twice the thermal conductivity and 1.85 times the size Thermal conductivity as a corresponding mold of quartz sand. ever After which particle size distribution is selected for the aluminum granules, the Thermal conductivity of the mold can still be increased.
- FIG. 2 shows the so-called dendrite arm spacing of molded parts shown in molds with the three compositions of Figure 1 were manufactured.
- the dendrite arm spacing is, when using 98 wt.% Aluminum granules and 2% by weight of magnesium sulphate, measured on parts with 18 mm wall thickness at least 30% and measured on parts with 6 mm wall thickness at least 20% smaller than when using quartz sand.
- the Dendrite arm spacing is 20 to 40% when using aluminum granules greater than when using steel molds.
- the dendrite arm spacing is a measure of the cooling rate of the casting and can under a microscope measured on a ground surface of the casting become. The smaller the Dendritenarmabstand, the greater are, for example the notched impact strength and elongation at break of the casting.
- FIGS. 3 and 4 show further mechanical properties of the molded parts shown.
- Figure 3 the properties measured on tensile bars, consisting of the Casting parts were taken and in Figure 4, the properties of the components, such as wheel, wishbone, swivel or other bearing Parts in the automotive industry, itself.
- magnesium sulfate is easily soluble in water and environmentally neutral. at frequently changing moldings and smaller quantities is the use of granules more economical than the use of ever-changing Chill molds.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Abstract
Description
Claims (8)
- Formmassenzusammensetzung zur Herstellung von Giessformen aus einem Metallgranulat und einem anorganischen Bindemittel, wobei das Metallgranulat aus Aluminium oder einer Aluminiumlegierung ausgebildet ist, dadurch gekennzeichnet, dass das Bindemittel ein wasserlösliches anorganisches Magnesiumsalz ist.
- Formmassenzusammensetzung nach dem Anspruch 1, dadurch gekennzeichnet, dass das wasserlösliche anorganische Magnesiumsalz Magnesium(II)sulfat ist.
- Formmassenzusammensetzung nach mindestens einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Formmasse zu mindestens 98 Gew. % aus Aluminiumgranulat und der Rest aus wasserfreiem Magnesiumsulfat ausgebildet ist.
- Formmassenzusammensetzung nach mindestens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Aluminiumgranulat eine mittlere Korngrösse von 0.2 bis 0.4 mm aufweist, wobei weniger als 1 Gew. % des Aluminiumgranulates eine Korngrösse grösser als 2.0 mm und weniger als 5 Gew. % des Aluminiumgranulates eine Korngrösse kleiner als 0.1 mm. aufweisen.
- Formmassenzusammensetzung nach mindestens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass eine aus der Formmasse hergestellten und betriebsbereiten Giessform eine Wärmeleitfähigkeit von mindestens 1.2 (J / kg K) aufweist.
- Verwendung einer Formmassenzusammensetzung nach mindestens einem der Ansprüche 1 bis 5 zur Herstellung von Gussformteilen mit einem Dendritenarmabstand von weniger als 35 µm.
- Verwendung einer Formmassenzusammensetzung nach mindestens einem der Ansprüche 1 bis 5 zur Herstellung von Gussformteilen mit einer 0.2% Dehngrenze von mindestens 230 N/mm2 bei einer gleichzeitigen Bruchdehnung von mindestens 6%.
- Verwendung einer Formmassenzusammensetzung nach mindestens einem der Ansprüche 1 bis 7 zur Herstellung von tragenden Bauteilen für den Automobilbau.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10349260 | 2003-10-20 | ||
| DE10349260A DE10349260A1 (de) | 2003-10-20 | 2003-10-20 | Formmassenzusammensetzung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1525929A1 true EP1525929A1 (de) | 2005-04-27 |
| EP1525929B1 EP1525929B1 (de) | 2008-03-05 |
Family
ID=34384411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04015692A Expired - Lifetime EP1525929B1 (de) | 2003-10-20 | 2004-07-03 | Formmassenzusammensetzung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1525929B1 (de) |
| AT (1) | ATE387975T1 (de) |
| DE (2) | DE10349260A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2312011A1 (de) * | 2009-10-15 | 2011-04-20 | Georg Fischer Automotive AG | Verfahren zur metallischen Beschichtung eines Gussformteiles und aluminisiertes Gussformteil hergestellt durch das Verfahren |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE608751C (de) * | 1933-09-17 | 1935-01-31 | Metallgesellschaft Ag | Formmasse fuer Metallgussdauerformen |
| GB600093A (en) * | 1945-08-28 | 1948-03-31 | Jessop William & Sons Ltd | Improvements in the manufacture of moulds for casting metals |
| FR2209622A1 (en) * | 1972-12-11 | 1974-07-05 | Pont A Mousson | Foundry moulds and cores prodn. using powdered metal - with a binder contg. polymerisable resin, clays or silicates |
| DE2450013A1 (de) * | 1973-10-25 | 1975-04-30 | Csepeli Femmue | Gussformmischung mit hoher waermeleitfaehigkeit |
| EP0914886A1 (de) * | 1997-11-12 | 1999-05-12 | Georg Fischer Fahrzeugtechnik AG | Verfahren zur Herstellung von Giessformen für das Abgiessen von flüssigen Metallen und Anwendung des Verfahrens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR890004247B1 (ko) * | 1984-04-02 | 1989-10-28 | 가부시기가이샤 히다찌세이사꾸쇼 | 슬립 캐스팅(slip casting) 성형법 및 성형용 주형(成形用鑄型) |
| DE10059083C1 (de) * | 2000-11-28 | 2002-01-24 | Porsche Ag | Einlegekern zur Herstellung einer Gussform sowie Verfahren zur Herstellung eines Gussform |
-
2003
- 2003-10-20 DE DE10349260A patent/DE10349260A1/de not_active Withdrawn
-
2004
- 2004-07-03 EP EP04015692A patent/EP1525929B1/de not_active Expired - Lifetime
- 2004-07-03 DE DE502004006393T patent/DE502004006393D1/de not_active Expired - Lifetime
- 2004-07-03 AT AT04015692T patent/ATE387975T1/de not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE608751C (de) * | 1933-09-17 | 1935-01-31 | Metallgesellschaft Ag | Formmasse fuer Metallgussdauerformen |
| GB600093A (en) * | 1945-08-28 | 1948-03-31 | Jessop William & Sons Ltd | Improvements in the manufacture of moulds for casting metals |
| FR2209622A1 (en) * | 1972-12-11 | 1974-07-05 | Pont A Mousson | Foundry moulds and cores prodn. using powdered metal - with a binder contg. polymerisable resin, clays or silicates |
| DE2450013A1 (de) * | 1973-10-25 | 1975-04-30 | Csepeli Femmue | Gussformmischung mit hoher waermeleitfaehigkeit |
| EP0914886A1 (de) * | 1997-11-12 | 1999-05-12 | Georg Fischer Fahrzeugtechnik AG | Verfahren zur Herstellung von Giessformen für das Abgiessen von flüssigen Metallen und Anwendung des Verfahrens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2312011A1 (de) * | 2009-10-15 | 2011-04-20 | Georg Fischer Automotive AG | Verfahren zur metallischen Beschichtung eines Gussformteiles und aluminisiertes Gussformteil hergestellt durch das Verfahren |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1525929B1 (de) | 2008-03-05 |
| DE10349260A1 (de) | 2005-05-12 |
| DE502004006393D1 (de) | 2008-04-17 |
| ATE387975T1 (de) | 2008-03-15 |
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