EP1620216A1 - Formstoff, formteil und verfahren zur herstellung von formteilen für eine giessform - Google Patents
Formstoff, formteil und verfahren zur herstellung von formteilen für eine giessformInfo
- Publication number
- EP1620216A1 EP1620216A1 EP04731830A EP04731830A EP1620216A1 EP 1620216 A1 EP1620216 A1 EP 1620216A1 EP 04731830 A EP04731830 A EP 04731830A EP 04731830 A EP04731830 A EP 04731830A EP 1620216 A1 EP1620216 A1 EP 1620216A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molding
- casting
- molding material
- solidification
- produced
- 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
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
- B22C1/186—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 contaming ammonium or metal silicates, silica sols
- B22C1/188—Alkali metal silicates
Definitions
- the invention relates to a molding material for the production of moldings for casting molds for casting molten metals, in particular light metal melts, such as Aluminiumgussschmelzen. Moreover, the invention relates to moldings produced from such a molding material. Finally, the invention provides a method with which molded parts can be produced from molded materials according to the invention.
- quartz sand is usually used as a raw material of molded materials from which moldings, such as casting cores, are produced for casting molds. This sand is placed in advance in a mixer and mixed with a binder. The molding material obtained by this mixture is then injected into the mold cavity defining the shape of the molding to be produced. Subsequently, the solidification of the molding takes place in the mold. If an organic binder, for example synthetic resin-based binder, is used, a chemical reaction in the molding material injected into the molding tool is brought about.
- an organic binder for example synthetic resin-based binder
- an inorganic for example, water-glass-based binder
- heat is usually added to the molding material contained in the mold in order to bring about the solidification of the molded part to be produced by evaporation of the water contained in the molding material.
- quartz sand as a raw material for the production of moldings has proven itself in many ways, especially in the field of casting of light metal materials.
- quartz sand can be obtained inexpensively and is characterized by a simple processability and a good quality in the image of the mold elements of each mold part to be produced.
- the object of the invention was to provide a molding material, which allows the cost-effective production of mold parts, in particular casting cores.
- low cost manufacturable molded parts and a method should be specified, which makes it possible to produce such moldings.
- this object is achieved in that such a Foritistoff from a base material produced based on quartz-free sand and mixed with the mold base, based on water glass produced inorganic binder is produced.
- quartz-free sand Particularly suitable as quartz-free sand is olivine sand, which is a widely used mineral that is available inexpensively in large quantities.
- molding materials which are produced according to the invention on the basis of a wholly or at least predominantly quartz-free sand base material also detach themselves perfectly from the finished casting when they are bonded with a waterglass binder.
- the remaining sand retention on the casting is reduced to a minimum. In this way, even when using Moldings made of novel moldings containing a water glass binder can be guaranteed to give sanding adherence-free castings.
- the molding material produced on the basis of quartz-free sand, in particular olivine, according to the invention creates the prerequisite for cost-effective production of castings.
- the outlay for sand removal is reduced compared with that which is obtained in the cleaning of cast parts which have been cast using molded parts produced from conventional, quartz-containing molding materials.
- the molding material used according to the invention can consist entirely of quartz-free sand.
- quartz-free sand, in particular olivine mixed with the main constituent supports mullite content which supports the automatic disintegration of the moldings produced on the basis of the molding base material in the course of the solidification of the casting component. This proves to be particularly advantageous if it s in the molding 'concerns cores that map cavities in the finished Cast.
- a particularly satisfying the requirements of the practice molding composition is characterized in that it contains 1.5 to 3.0 wt .-% of water glass.
- To improve the sand life of the molding material of the invention may contain 0.3 to 0.5 wt .-% sodium hydroxide solution.
- a molded part according to the invention for casting molds which is in particular a casting core, is produced from a molding material according to the invention.
- the advantageous effects achieved by using a molding material system based on the mixture of quartz-free sands and an inorganic water glass binder in the casting of light metal melts are independent of the process by which the respective molded parts, in particular casting cores, have been produced.
- the molding is then removed from the molding box and cured fully under the influence of microwave heating.
- moldings which are produced by mixing quartz-free sands according to the invention, in particular olivine sand precursors, with an inorganic binder can reliably produce molded parts which not only have a particularly high strength and image fidelity, but moreover have the property of to disintegrate without adhesion during the production of the castings. Decay promoting additives in the binder system are no longer required. Therefore, in the application of the invention, environmental stresses and hazards to the operator are avoided by escaping gases whose formation and unwanted spread can be minimized in conventional manufacturing only with great technical effort.
- the temperature of the mold box in the first phase of solidification should be 150 ° C to '200 ° C.
- the complete curing of the molding then adjusts safely when the exposure time of the microwave heating in the second phase of solidification is 2 - 5 minutes.
- the respective exposure time can be adjusted taking into account the complexity of the shaping so that at the end of the microwave treatment sufficient for the casting process final strength and dryness of the molding is guaranteed.
- a molding material has subsequently been produced by mixing the molding material with a waterglass binder.
- a proportion of sodium hydroxide solution has been added to the molding base to improve its durability.
- the mold base material thus composed contained 2.5% by weight of waterglass binder, 0.3% by weight of sodium hydroxide solution and the remainder the molding base material of the above-described composition.
- This molding material has been placed in the cavity of a preheated molding box which images the finished casting core. Due to the excellent flowability of the molding material while difficult-shaped, small-part mold elements of the cavity have been filled safely. This secure mold filling has also been supported by the fact that the mold box has already been subjected to negative pressure during the filling process. The negative pressure was 0.3 bar.
- the temperature of the mold box was 180 ° C when filling the molding material. At this temperature, after completion of the filling operation in the molding box, the molding material has been held for 30 seconds with still effective negative pressure. At this time formed in the area of the inner walls of the Mold box adjacent areas of the molding material, a solid outer shell. In this way, at the end of the completed in the mold box first stage of solidification, a molding was available, the strength was sufficient to be able to safely transport it in a microwave oven can.
- the molded article In the microwave oven, the molded article has been microwave heated for 3 minutes until it has reached a final strength sufficient for the casting insert.
- the casting core thus produced has then been placed in a casting mold, in which subsequently the melt produced from the aluminum casting alloy has been cast to the cylinder head to be produced.
- the casting core is automatically disintegrated into many small fragments due to the temperature influence of the casting heat and its due to the solidification of the casting mechanical stress, which could be easily removed after complete solidification of the casting.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL04731830T PL1620216T3 (pl) | 2003-05-09 | 2004-05-08 | Tworzywo do formowania, element formowany i sposób wytwarzania elementów formowanych stosowanych w formie odlewniczej |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10321106A DE10321106A1 (de) | 2003-05-09 | 2003-05-09 | Formstoff, Formteil und Verfahren zur Herstellung von Formteilen für eine Gießform |
PCT/EP2004/004936 WO2004098811A1 (de) | 2003-05-09 | 2004-05-08 | Formstoff, formteil und verfahren zur herstellung von formteilen für eine giessform |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1620216A1 true EP1620216A1 (de) | 2006-02-01 |
EP1620216B1 EP1620216B1 (de) | 2006-06-21 |
Family
ID=33426732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04731830A Expired - Lifetime EP1620216B1 (de) | 2003-05-09 | 2004-05-08 | Formstoff, formteil und verfahren zur herstellung von formteilen für eine giessform |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1620216B1 (de) |
AT (1) | ATE330733T1 (de) |
AU (1) | AU2004235962A1 (de) |
DE (2) | DE10321106A1 (de) |
ES (1) | ES2267068T3 (de) |
MX (1) | MXPA05011996A (de) |
PL (1) | PL1620216T3 (de) |
WO (1) | WO2004098811A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2163328A1 (de) * | 2008-09-05 | 2010-03-17 | Minelco GmbH | Mit Wasserglas beschichteter und/oder vermischter Kern- oder Formsand mit einem Wassergehalt im Bereich von >= etwa 0,25 Gew.-% bis etwa 0,9 Gew.-% |
PL2916976T3 (pl) | 2013-10-19 | 2017-08-31 | Peak Deutschland Gmbh | Sposób wytwarzania traconych rdzeni lub elementów formowanych do produkcji odlewów |
DE102014221994B4 (de) * | 2014-10-29 | 2023-03-30 | Bayerische Motoren Werke Aktiengesellschaft | Herstellen und Bearbeiten von Gussteilen |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2322667A (en) * | 1942-07-31 | 1943-06-22 | Westinghouse Electric & Mfg Co | Mold and mold composition |
GB1042659A (en) * | 1964-10-29 | 1966-09-14 | Thaelmann Schwermaschbau Veb | Method of making foundry moulds |
JPS58107250A (ja) * | 1981-12-21 | 1983-06-25 | Komatsu Ltd | マイクロ波加熱硬化鋳型用中子の製造方法 |
DE3841473A1 (de) * | 1988-12-09 | 1990-06-13 | Heinze Gerald | Formsand fuer giessereizwecke |
JPH0663683A (ja) * | 1992-08-18 | 1994-03-08 | Mitsubishi Heavy Ind Ltd | 鋳型の製造方法 |
DE69512426T2 (de) * | 1994-10-13 | 2000-01-27 | Georg Fischer Disa A S Herlev | Formen und kerne aus gebrochenem und gradiertem magnetiterz und verfahren zum giessen von metall unter deren verwendung |
EP1043094B1 (de) * | 1999-04-09 | 2008-12-24 | SHERA-Werkstofftechnologie GmbH & Co.KG | Verfahren zur Herstellung von Gusswerkstücken |
JP3204653B2 (ja) * | 1999-11-08 | 2001-09-04 | ファー・アー・ヴェー アルミニウム アクチェンゲゼルシャフト | 鋳造中子製造用水ガラス基バインダー |
CN1298456C (zh) * | 2001-09-14 | 2007-02-07 | 曼德尔和贝格尔氢化铝有限公司 | 制造铸件的方法,型砂及其实施此方法的应用 |
-
2003
- 2003-05-09 DE DE10321106A patent/DE10321106A1/de not_active Ceased
-
2004
- 2004-05-08 WO PCT/EP2004/004936 patent/WO2004098811A1/de active IP Right Grant
- 2004-05-08 ES ES04731830T patent/ES2267068T3/es not_active Expired - Lifetime
- 2004-05-08 PL PL04731830T patent/PL1620216T3/pl unknown
- 2004-05-08 MX MXPA05011996A patent/MXPA05011996A/es unknown
- 2004-05-08 AT AT04731830T patent/ATE330733T1/de not_active IP Right Cessation
- 2004-05-08 DE DE502004000846T patent/DE502004000846D1/de not_active Expired - Fee Related
- 2004-05-08 AU AU2004235962A patent/AU2004235962A1/en not_active Abandoned
- 2004-05-08 EP EP04731830A patent/EP1620216B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2004098811A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE330733T1 (de) | 2006-07-15 |
MXPA05011996A (es) | 2006-02-02 |
WO2004098811A1 (de) | 2004-11-18 |
EP1620216B1 (de) | 2006-06-21 |
DE502004000846D1 (de) | 2006-08-03 |
ES2267068T3 (es) | 2007-03-01 |
DE10321106A1 (de) | 2004-12-23 |
AU2004235962A1 (en) | 2004-11-18 |
PL1620216T3 (pl) | 2006-11-30 |
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