DE19709081A1 - Rapid prototyping of sand casting moulds and cores by layered build=up - Google Patents
Rapid prototyping of sand casting moulds and cores by layered build=upInfo
- Publication number
- DE19709081A1 DE19709081A1 DE19709081A DE19709081A DE19709081A1 DE 19709081 A1 DE19709081 A1 DE 19709081A1 DE 19709081 A DE19709081 A DE 19709081A DE 19709081 A DE19709081 A DE 19709081A DE 19709081 A1 DE19709081 A1 DE 19709081A1
- Authority
- DE
- Germany
- Prior art keywords
- substance
- layer
- nozzles
- row
- solidification
- 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- Withdrawn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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/36—Feeding the material on to the mould, core or other substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur schichtweisen Her stellung von dreidimensionalen Objekten, das besonders für die schnelle Herstellung von Gußformen oder Kernen ohne die Ver wendung von Urformwerkzeugen geeignet ist.The invention relates to a method for layer-by-layer production positioning of three-dimensional objects, especially for the rapid production of molds or cores without the Ver use of master molds is suitable.
Unter den Oberbegriffen generative Fertigungsverfahren, Rapid Prototyping, Solid Freeform Manufacturing und Fast Freeform Fabrication sind verschiedene Verfahren bekannt, mit denen di rekt aus den CAD-Daten dreidimensionale Objekte erzeugt werden können. Bei den meisten dieser Verfahren wird schichtweise ein Formstoff aufgetragen, welcher in jeder Schicht durch selekti ve Belichtung mit einem Laserstrahl verfestigt wird. Eines dieser Verfahren, das aus der Patentschrift PCT/EP95/01994 be kannt ist, ist auch für die Herstellung von Gußformen für das Sandgußverfahren geeignet. Die Arbeitsgeschwindigkeit ist bei diesem Verfahren dadurch begrenzt, daß für jeden Punkt der zu verfestigenden Flache einer Schicht eine Mindest-Be strahlungszeit benötigt wird, um eine Aushartung zu errei chen. Dies wirkt sich vor allem dann negativ aus, wenn der Flächenanteil, der verfestigt werden soll, groß ist.Under the terms generative manufacturing process, Rapid Prototyping, Solid Freeform Manufacturing and Fast Freeform Fabrication are known various methods with which di three-dimensional objects are generated directly from the CAD data can. Most of these procedures involve stratification Molded material applied, which in each layer by selective ve exposure is solidified with a laser beam. One this method, which is known from the patent specification PCT / EP95 / 01994 is known, is also for the production of molds for the Sand casting process suitable. The working speed is at This method is limited in that for each point the consolidating surface of a layer a minimum Be radiation time is required to achieve hardening chen. This has a particularly negative effect if the The proportion of the area to be consolidated is large.
Bei einem weiteren Verfahren für die Herstellung von Gußfor men, das ohne die aufwendige Lasertechnik arbeitet, wird mit einer verfahrbaren Düse ein Bindemittel selektiv auf einen Formgrundstoff aufgebracht (modern casting, March 1993, S. 55 und Aug. 1993 S. 30/31). Mit diesem als "direct shell producti on casting" oder "three dimensional printing" bezeichneten Prozeß können schalenartige Formen für das Feingußverfahren, jedoch keine Gußformen für das Sandgußverfahren erzeugt wer den.In another process for the production of Gußfor men who work without the elaborate laser technology, is with selectively bind a binder onto a movable nozzle Mold base material applied (modern casting, March 1993, p. 55 and Aug. 1993 pp. 30/31). With this as a "direct shell producti on casting "or" three dimensional printing " Process can shell-like shapes for the investment casting process, however, no molds for the sand casting process who produces the.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, mit dem auch großvolumige dreidimensionale Objekte beliebiger Form in kurzer Zeit ohne Urformmodelle generiert werden können und das auch für die Herstellung von Gußformen für das Sandgußverfahren geeignet ist. The invention is based on the object of a method create with which also large-volume three-dimensional objects any form generated in a short time without master forms can be and also for the production of molds is suitable for the sand casting process.
Diese Aufgabe wird durch die in Anspruch 1 aufgeführten Merk male gelöst. Dadurch, daß der Stoff B gleichzeitig durch eine ganze Reihe von Düsen, bzw. eine schlitzförmige Austrittsöff nung aufgebracht wird, deren Lange der Breite des Arbeitsrau mes entspricht, kann eine sehr kurze Bearbeitungszeit erreicht werden. Bei der Herstellung von Gußformen oder Kernen für das Sandgußverfahren können als Stoff A (Formgrundstoff) die übli chen Sande verwendet werden. Als Stoff B kommen vor allem flüssige Harzbinder in Frage. Dosierung und Viskosität des Binders müssen auf die angestrebte Schichtdicke abgestimmt werden. Die nicht verfestigten Anteile werden erst nach dem vollstandigen Aufbau des Körpers und nach dessen Verfestigung entfernt. Auch die Herstellung von Urformwerkzeugen und -model len ist mit dem erfindungsgemäßen Verfahren möglich.This object is achieved by the Merk listed in claim 1 times solved. The fact that the substance B at the same time by a whole row of nozzles, or a slit-shaped outlet opening Application is applied, the length of the width of the working area mes, a very short processing time can be achieved will. In the manufacture of molds or cores for the Sand casting processes can be the usual as substance A (basic molding material) Chen sands can be used. Above all come as substance B. liquid resin binder in question. Dosage and viscosity of the Binders must be matched to the desired layer thickness will. The unconsolidated portions are only after complete structure of the body and after its solidification away. Also the production of master molds and models len is possible with the method according to the invention.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is in the drawing shown and is described in more detail below.
In der Zeichnung ist in der Draufsicht dargestellt, wie der Stoff B auf eine Schicht des Stoffes A bei einem Ausführungs beispiel gemäß Anspruch 4 aufgebracht wird. Das zu erzeugende Objekt ist in diesem Beispiel ein Kern für eine Gußform, der unter Berücksichtigung möglicher gießereitechnisch notwendiger Veränderungen, direkt aus den Daten des dreidimensionalen CAD-Modells erstellt wird.In the drawing, the top view shows how the Fabric B on a layer of fabric A in one execution example is applied according to claim 4. The one to be created In this example, the object is a core for a casting mold, the considering possible foundry technically necessary Changes directly from the data of the three-dimensional CAD model is created.
Auf der Unterseite einer Spritzleiste (1) befindet sich eine Reihe von feinen Düsen (2), deren Abstand in der Größenordnung der Schichtdicke liegt. Durch diese wird der Binder (Stoff B) entweder kontinuierlich oder durch einzelne Druckstöße in Ab hängigkeit vom Vorschub der Spritzleiste auf den Formgrund stoff (Stoff A) aufgespritzt. Bei einem kontinuierlichen Austritt des Binders aus den Düsen wird der Durchfluß über den Druck an die Vorschubgeschwindigkeit der Spritzleiste ange paßt.On the underside of a spray bar ( 1 ) there is a row of fine nozzles ( 2 ), the spacing of which is in the order of the layer thickness. Through this, the binder (fabric B) is sprayed onto the base material (fabric A) either continuously or by individual pressure surges depending on the advance of the spray bar. With a continuous exit of the binder from the nozzles, the flow rate is adjusted to the feed speed of the spray bar via the pressure.
Mit Hilfe zweier verschieblicher Schließelemente (3) wird der Abschnitt der Düsenreihe, in dem die Düsen geöffnet sind, ent sprechend der Kontur der Schnittflache des zu erzeugenden Kerns (4) variiert. Die Fläche, bei der schon Binder aufgetra gen ist, ist schraffiert dargestellt. In der Regel muß die Spritzleiste über jeder Schicht nur einmal verfahren werden. Da der Vorschub beim Auftragen des Binders nur in eine Rich tung erfolgt, kann gleichzeitig auch die nächste Schicht des Formgrundstoffes aufgetragen werden.With the help of two movable closing elements ( 3 ), the section of the row of nozzles in which the nozzles are open is varied accordingly to the contour of the cut surface of the core ( 4 ) to be produced. The area where Binder has already been applied is shown hatched. As a rule, the spray bar only has to be moved once over each layer. Since the feed is only in one direction when the binder is applied, the next layer of the base material can also be applied at the same time.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19709081A DE19709081A1 (en) | 1997-03-06 | 1997-03-06 | Rapid prototyping of sand casting moulds and cores by layered build=up |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19709081A DE19709081A1 (en) | 1997-03-06 | 1997-03-06 | Rapid prototyping of sand casting moulds and cores by layered build=up |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19709081A1 true DE19709081A1 (en) | 1998-09-10 |
Family
ID=7822387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19709081A Withdrawn DE19709081A1 (en) | 1997-03-06 | 1997-03-06 | Rapid prototyping of sand casting moulds and cores by layered build=up |
Country Status (1)
Country | Link |
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DE (1) | DE19709081A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102397991A (en) * | 2011-11-25 | 2012-04-04 | 中国一拖集团有限公司 | Quick manufacturing method for die-free casting sand mold |
CN107282892A (en) * | 2017-07-21 | 2017-10-24 | 北京航星机器制造有限公司 | A kind of 3D printing core formative method of aluminium alloy castings |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4122326C1 (en) * | 1991-07-05 | 1993-02-04 | Rolf 7245 Starzach De Jethon | Three=dimensional shaped bodies prodn. - by putting powder on photosemiconductor by electrostatic force and transferring to workpiece support |
DE4244579A1 (en) * | 1991-07-05 | 1994-07-07 | Rolf Jethon | Process for the dieless production of three-dimensional mouldings by stereolithography |
DE4410046C1 (en) * | 1994-03-23 | 1995-05-24 | Eos Electro Optical Syst | Method and material for producing a three-dimensional object by sintering |
WO1995032824A1 (en) * | 1994-05-27 | 1995-12-07 | Eos Gmbh Electro Optical Systems | Process for use in foundry practice |
-
1997
- 1997-03-06 DE DE19709081A patent/DE19709081A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4122326C1 (en) * | 1991-07-05 | 1993-02-04 | Rolf 7245 Starzach De Jethon | Three=dimensional shaped bodies prodn. - by putting powder on photosemiconductor by electrostatic force and transferring to workpiece support |
DE4244579A1 (en) * | 1991-07-05 | 1994-07-07 | Rolf Jethon | Process for the dieless production of three-dimensional mouldings by stereolithography |
DE4410046C1 (en) * | 1994-03-23 | 1995-05-24 | Eos Electro Optical Syst | Method and material for producing a three-dimensional object by sintering |
WO1995032824A1 (en) * | 1994-05-27 | 1995-12-07 | Eos Gmbh Electro Optical Systems | Process for use in foundry practice |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102397991A (en) * | 2011-11-25 | 2012-04-04 | 中国一拖集团有限公司 | Quick manufacturing method for die-free casting sand mold |
CN102397991B (en) * | 2011-11-25 | 2013-07-24 | 中国一拖集团有限公司 | Quick manufacturing method for die-free casting sand mold |
CN107282892A (en) * | 2017-07-21 | 2017-10-24 | 北京航星机器制造有限公司 | A kind of 3D printing core formative method of aluminium alloy castings |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8122 | Nonbinding interest in granting licences declared | ||
8125 | Change of the main classification |
Ipc: B29C 67/00 |
|
8139 | Disposal/non-payment of the annual fee |