DE102005009636B4 - Method of generating a sand mold generatively - Google Patents
Method of generating a sand mold generatively Download PDFInfo
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- DE102005009636B4 DE102005009636B4 DE102005009636.0A DE102005009636A DE102005009636B4 DE 102005009636 B4 DE102005009636 B4 DE 102005009636B4 DE 102005009636 A DE102005009636 A DE 102005009636A DE 102005009636 B4 DE102005009636 B4 DE 102005009636B4
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- acid
- nitrogen
- resin
- resin component
- sand
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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
- 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
- B22C1/20—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 organic agents
- B22C1/22—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 organic agents of resins or rosins
- B22C1/2233—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 organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/224—Furan polymers
-
- 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
- B22C1/20—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 organic agents
- B22C1/22—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 organic agents of resins or rosins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C08L61/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08L61/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09D161/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C09D161/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09D161/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C09D161/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/41—Compounds containing sulfur bound to oxygen
- C08K5/42—Sulfonic acids; Derivatives thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Verfahren zum Herstellen einer Sandform im Wege des generativen 3D-Druckverfahrens mit Hilfe eines säurehärtbaren Bindemittelsystems auf der Basis einer säurehärtbaren Harzkomponente, der mindestens eine stickstoffhaltige Verbindung zugesetzt ist, wobei ein Formsand mit Arylsulfonsäure als Härter vorgemischt und das Sand/Säuregemisch schichtweise mit der stickstoffhaltigen Harzkomponente bedruckt wird, dadurch gekennzeichnet, dass die mindestens eine stickstoffhaltige Verbindung der säurehärtbaren Harzkomponente mit einem Stickstoffanteil von 2 bis 6 Gew.-%, bezogen auf das Gesamtharz, zugesetzt wird, wobei die mindestens eine stickstoffhaltige Verbindung aus der Gruppe Harnstoff, Harnstoff/Formaldehydharze, Melamin und Melamin/Formaldehydharze ausgewählt ist, und die Arylsulfonsäure mit einem Gewichtsanteil von 10 bis 65% der Gesamtharzmenge verwendet wird.A method of making a sand mold by the additive 3D printing method using an acid curable binder system based on an acid-curable resin component having added thereto at least one nitrogen-containing compound, wherein a molding sand is premixed with arylsulfonic acid as a hardener and the sand / acid mixture is layered with the nitrogen-containing resin component is printed, characterized in that the at least one nitrogen-containing compound of the acid-curable resin component having a nitrogen content of 2 to 6 wt .-%, based on the total resin, is added, wherein the at least one nitrogen-containing compound from the group urea, urea / formaldehyde resins, Melamine and melamine / formaldehyde resins is selected, and the arylsulfonic acid is used in a proportion by weight of 10 to 65% of the total amount of resin.
Description
Die Erfindung bezieht sich auf ein Verfahren zum Herstellen einer Sandform nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for producing a sand mold according to the preamble of patent claim 1.
Aus der
So ist aus der
Aus
Aus
Ein gattungsgemäßes Verfahren ist aus der
Aufgabe der Erfindung ist es, ein generatives 3D-Druckverfahren und ein hierfür geeignetes Bindemittelsystem der eingangs genannten Art zu schaffen, welches ein geringes Ausgasungsverhalten während des Gussvorgangs und zugleich eine hohe Festigkeit der mit dem Bindemittelsystem gefertigten Sandformen bei verkürzten Reaktionszeiten gewährleistet.The object of the invention is to provide a generative 3D printing method and a suitable binder system of the type mentioned, which ensures a low outgassing behavior during the casting process and at the same time a high strength of the sand molds made with the binder system with shorter reaction times.
Diese Aufgabe wird erfindungsgemäß durch das im Patentanspruch 1 gekennzeichnete Verfahren gelöst.This object is achieved by the characterized in claim 1 method.
Grundlage der Erfindung ist die Erkenntnis, dass eine Festigkeitserhöhung durch Zugabe einer stickstoffhaltigen Verbindung nicht zwangsläufig mit einer erhöhten Ausgasung des Bindemittelsystems während des Abgusses verbunden ist, sondern sich das gussstörende Ausgasungsverhalten überraschenderweise durch eine Stickstoffzugabe zur säurehärtbaren Harzkomponente sogar noch signifikant verringern lässt, wenn der Stickstoffanteil an der Gesamtharzmenge innerhalb definierter Grenzen gehalten und zusätzlich ein spezieller Härter mit einem, bezogen auf die Harzmenge, ebenfalls begrenzten Gewichtsanteil verwendet wird, mit dem Ergebnis, dass die resultierenden Sandformen eine hohe Bruch- und Biegefestigkeit aufweisen und dennoch eine qualitativ hochwertige, von Porositäten und Lunkern weitgehend freie und maßgenaue Gussteilfertigung sicherstellen.The invention is based on the finding that an increase in strength due to the addition of a nitrogen-containing compound is not necessarily associated with increased outgassing of the binder system during the casting, but surprisingly can even significantly reduce the casting-disturbing outgassing behavior by adding nitrogen to the acid-curable resin component, if the nitrogen content held on the total amount of resin within defined limits and in addition a special hardener with a, based on the amount of resin, also limited weight fraction is used, with the result that the resulting sand molds have a high breaking and bending strength and yet a high-quality, of porosities and Ensure largely free and dimensionally accurate castings.
Ein weiterer, vor allem in Verbindung mit dem generativen 3D-Druckverfahren wesentlicher Aspekt des erfindungsgemäßen Bindemittelsystems liegt in den verkürzten Reaktionszeiten und den sich daraus ergebenden, höheren Produktionsgeschwindigkeiten. Dabei wird der Formsand vorzugsweise mit dem Härter des Bindemittelsystems vorgemischt und das Sand/Härtergemisch schichtweise mit der stickstoffhaltig angereicherten Harzkomponente bedruckt, wodurch die Sandformfestigkeit nochmals gesteigert werden kann.Another essential aspect of the binder system according to the invention, especially in connection with the generative 3D printing process, is the shortened reaction times and the resulting, higher production speeds. In this case, the molding sand is preferably premixed with the curing agent of the binder system and the sand / hardener mixture is printed in layers with the nitrogen-containing enriched resin component, whereby the sand resistance can be increased again.
Eine besonders bevorzugte Ausgestaltung des erfindungsgemäßen Verfahrens betrifft die Reinigung des Druckkopfes: Während das generative 3D-Drucken mit einer durch eine stickstoffhaltige Verbindung, etwa Harnstoffharz, angereicherten Harzkomponente bisher zumeist daran scheiterte, dass die verstopfungsgefährdeten Druckerdüsen nicht oder nur mit unvertretbar großem Aufwand gereinigt werden konnten, lassen sich die Druckerdüsen von den Harzrückständen des erfindungsgemäßen Bindemittelsystems problemlos mit Hilfe eines aromatischen Alkohols, vorzugsweise Benzylalkohol, befreien.A particularly preferred embodiment of the method according to the invention relates to the cleaning of the printhead: While the generative 3D printing with a enriched by a nitrogen compound, such as urea resin, resin component so far mostly failed because the clogged printing nozzles could not be cleaned or only with unreasonable effort , can the printer nozzles of the resin residues of the binder system of the invention easily with the help of an aromatic alcohol, preferably benzyl alcohol free.
Als besonders vorteilhaft hat es sich erwiesen, als stickstoffhaltige Verbindung ein Harnstoffharz mit einem Gewichtsanteil an der Gesamtharzmenge von etwa 4% und als Härter Xylolsulfonsäure mit 30 bis 50 Gew.-%, bezogen auf das Gesamtharz, auszuwählen.It has proven to be particularly advantageous to select as the nitrogen-containing compound a urea resin having a weight fraction of the total resin amount of about 4% and as a curing agent xylene sulfonic acid having from 30 to 50% by weight, based on the total resin.
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels in Verbindung mit der Zeichnung näher beschrieben, in deren einziger Figur eine generative 3D-Druckanlage in stark schematisierter Darstellung gezeigt ist.The invention will be described in more detail below with reference to an embodiment in conjunction with the drawing, in the single figure of a generative 3D printing system is shown in a highly schematic representation.
Die in der Zeichnung gezeigte Druckanlage enthält einen Formsandbehälter
Der Formsand und die Xylolsulfonsäure werden zunächst im einem Mischer
Im Hinblick auf kurze Aushärtzeiten, eine hohe Sandformfestigkeit und ein geringes Ausgasungsverhalten der Sandform
Sehr einfach ist auch die Druckkopfreinigung, da sich Rückstände des Furfurylalkohol/Harnstoffharzgemisches mühelos mit Benzylalkohol aus den Druckerdüsen
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005009636.0A DE102005009636B4 (en) | 2005-03-03 | 2005-03-03 | Method of generating a sand mold generatively |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005009636.0A DE102005009636B4 (en) | 2005-03-03 | 2005-03-03 | Method of generating a sand mold generatively |
Publications (2)
Publication Number | Publication Date |
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DE102005009636A1 DE102005009636A1 (en) | 2006-09-07 |
DE102005009636B4 true DE102005009636B4 (en) | 2016-08-11 |
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DE102005009636.0A Expired - Fee Related DE102005009636B4 (en) | 2005-03-03 | 2005-03-03 | Method of generating a sand mold generatively |
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Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1998911B1 (en) * | 2006-03-25 | 2011-07-20 | Bayerische Motoren Werke Aktiengesellschaft | Method for manufacturing a sand mould |
DE102013005891A1 (en) * | 2013-03-11 | 2014-09-11 | Universität Kassel | Generative method for producing a component having at least one cavity, in particular by 3D printing technology with a sand and a binder |
CN108339929B (en) * | 2017-10-27 | 2019-04-30 | 柳州柳晶环保科技有限公司 | A kind of forming and fixing agent and its preparation process and application |
CN110918878B (en) * | 2019-11-22 | 2021-08-17 | 郑州中兴三维科技有限公司 | 3D sand mould printing apparatus of quick replacement sand box |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2832869A1 (en) * | 1977-08-17 | 1979-03-08 | Quaker Oats Co | HARDLABLE BINDING AGENT FOR LARGE FOUNDRY SAND MOLDS AND PROCESS FOR MANUFACTURING SUCH MOLDS |
DE3624558A1 (en) * | 1985-07-29 | 1987-02-05 | Kao Quaker Co | Mould binder composition, and process for the production of a casting mould |
EP0540837B1 (en) * | 1991-11-07 | 1995-11-08 | Bakelite AG | Lignin modified binder |
US5932628A (en) * | 1994-08-19 | 1999-08-03 | Kao Corporation | Binder composition for production of molds and method of producing mold |
DE19853834A1 (en) * | 1998-11-21 | 2000-05-31 | Ingo Ederer | Production of casting molds comprises depositing particulate material on support, applying binder and hardener to form solidified structure in selected region, and removing solidified structure |
WO2001072502A1 (en) * | 2000-03-24 | 2001-10-04 | Generis Gmbh | Method for manufacturing a structural part by deposition technique |
WO2003016400A1 (en) * | 2001-07-26 | 2003-02-27 | Ashland-Südchemie-Kernfest GmbH | Resol-based co2-hardenable binding agent system |
WO2004110719A2 (en) * | 2003-06-16 | 2004-12-23 | Ingo Ederer | Improved methods and systems for manufacture of layered three-dimensional forms |
-
2005
- 2005-03-03 DE DE102005009636.0A patent/DE102005009636B4/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2832869A1 (en) * | 1977-08-17 | 1979-03-08 | Quaker Oats Co | HARDLABLE BINDING AGENT FOR LARGE FOUNDRY SAND MOLDS AND PROCESS FOR MANUFACTURING SUCH MOLDS |
DE3624558A1 (en) * | 1985-07-29 | 1987-02-05 | Kao Quaker Co | Mould binder composition, and process for the production of a casting mould |
EP0540837B1 (en) * | 1991-11-07 | 1995-11-08 | Bakelite AG | Lignin modified binder |
US5932628A (en) * | 1994-08-19 | 1999-08-03 | Kao Corporation | Binder composition for production of molds and method of producing mold |
DE19853834A1 (en) * | 1998-11-21 | 2000-05-31 | Ingo Ederer | Production of casting molds comprises depositing particulate material on support, applying binder and hardener to form solidified structure in selected region, and removing solidified structure |
WO2001072502A1 (en) * | 2000-03-24 | 2001-10-04 | Generis Gmbh | Method for manufacturing a structural part by deposition technique |
WO2003016400A1 (en) * | 2001-07-26 | 2003-02-27 | Ashland-Südchemie-Kernfest GmbH | Resol-based co2-hardenable binding agent system |
WO2004110719A2 (en) * | 2003-06-16 | 2004-12-23 | Ingo Ederer | Improved methods and systems for manufacture of layered three-dimensional forms |
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DE102005009636A1 (en) | 2006-09-07 |
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