EP0179100A1 - Process for producing cast components and pattern for use of this process. - Google Patents

Process for producing cast components and pattern for use of this process.

Info

Publication number
EP0179100A1
EP0179100A1 EP85901972A EP85901972A EP0179100A1 EP 0179100 A1 EP0179100 A1 EP 0179100A1 EP 85901972 A EP85901972 A EP 85901972A EP 85901972 A EP85901972 A EP 85901972A EP 0179100 A1 EP0179100 A1 EP 0179100A1
Authority
EP
European Patent Office
Prior art keywords
model
parts
gasifiable
reusable
model parts
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
Application number
EP85901972A
Other languages
German (de)
French (fr)
Other versions
EP0179100B1 (en
Inventor
Kurt Feuring
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buderus Bau und Abwassertechnik GmbH
Original Assignee
Buderus AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Buderus AG filed Critical Buderus AG
Priority to AT85901972T priority Critical patent/ATE31643T1/en
Publication of EP0179100A1 publication Critical patent/EP0179100A1/en
Application granted granted Critical
Publication of EP0179100B1 publication Critical patent/EP0179100B1/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould

Definitions

  • the invention relates to a method for producing castings according to the preamble of claim 1 and a model for performing this method.
  • a method is proposed with which castings with contours that do not conform to the shape can be produced without problems and without the disadvantages mentioned above.
  • the process according to the invention achieves its particular advantages in connection with the known vacuum molding technology.
  • This molding process is suitable for the production of castings with high dimensional accuracy even with larger dimensions, since the lack of binders means that the molding material can easily be shaken to form the densest core packing.
  • the high compression does not allow the use of larger full-form models. The instability of this model material otherwise leads to dimensionally inaccurate castings.
  • FIG. 1 a cross section through the model of a segment
  • FIG. 2 a cross section through a mold with a molded model
  • Fig. 3 A cross section through a mold half .when the model is removed and Fig. 4: A cross section through the finished mold in front of the
  • the tubbing has ribs made of L-shaped and T-shaped ribs.
  • the correct contours of the vertical ribs are designed as reusable model parts 1.
  • the contours of the horizontal rib flanges that do not conform to the shape form gasifiable model parts 2, the gasifiable model parts 2 are on the other
  • Model parts 1 stored so that they can be pulled out of the mold vertically after molding in the usual manner.
  • the tubbing shown represents a preferred application.
  • any other type and shape of the model parts 1, 2 is also conceivable.
  • the gasifiable model parts 2 can be mounted laterally on the reusable model parts 1 or surround them in partial areas.
  • the model according to FIG. 1 is exnformed into a mold 3 according to FIG. 2. To use the vacuum molding process, it is covered with a film 4 for this purpose.
  • a vacuum source 5 is then connected to the mold 3. According to FIG. 3, only the reusable model parts with the correct contours are pulled out of the mold.
  • the gasifiable model parts 2 remain in the form 3 7 which is shown in its final state in FIG. 4.

Abstract

Des parties de modèle gazéifiables (2) pour la formation de profils non adaptés à une forme et des parties de modèle réutilisables (1) sont réliées pour donner un modèle. Après le moulage, seules les parties de modèle réutilisables (1) sont enlevées du moule, alors que les parties de modèle gazéifiables (2) sont détruites lors de la coulée.Gasifiable model parts (2) for forming profiles not suitable for a shape and reusable model parts (1) are linked to give a model. After molding, only the reusable model parts (1) are removed from the mold, while the gasifiable model parts (2) are destroyed during casting.

Description

Ver ahren zur Erzeugung von Gußstücken und Modell zur Durchführung des VerfahrensProcess for producing castings and model for carrying out the method
Die Erfindung betri ft ein Verfahren-zum Erzeugen von Gußstücken nach dem Oberbegriff des Patentanspruches 1 und ein Modell zur Durchführung dieses Verfahrens.The invention relates to a method for producing castings according to the preamble of claim 1 and a model for performing this method.
Zum Ausformen von nicht formgerechteh Konturen, d.h. von Hinterschneidungen an Modellen, ist es üblich; mit Los¬ teilen zu arbeiten. Diese werden nach dem Herausnehmen d Modellhauptteiles in den entstandenen Formhohlraum hin¬ eingezogen und ebenfalls herausgenommen, um dann wieder mit dem Modellhauptteil zusammengefügt zu werden. Bei relativ schmalen Modellen kann nicht mit Losteilen ge¬ arbeitet werden, da kein ausreichend breiter Formhohl¬ raum entsteht. Hier müssen separate Kerne in die er¬ stellte Form eingefügt werden.For shaping non-conformal contours, i.e. of undercuts on models, it is common; to work with lot parts. After the main part of the model has been removed, these are drawn into the resulting mold cavity and also removed, in order then to be reassembled with the main part of the model. With relatively narrow models it is not possible to work with loose parts, since there is no sufficiently wide mold cavity. Here separate cores have to be inserted into the form created.
Eine andere Möglichkeit, nicht formgerechte Konturen auszuformen bietet die Vollformtechnik: mit vergasbaren Modellen. Hierbei wird das eingeformte Modell kurz vor oder während des Abgießens zerstört. Die Anwendung dieses Verfahrens hat ihre Grenzen in der Stabilität des verwendbaren geschäumten Kunststoffes, der einer Formstoffverdichtung relativ geringen Widerstand ent- gegensetzt. Das kann zu Verzug oder Maßabweichungen an den Abgüssen führen. Für jeden Abguß ist ein ne'ues Modell zu erstellen, welches dann vollständig vergast. Es müssen während des Gießens relativ große Gasmengen abgeführt werden. Die Rückstände an der Gußstückober- fläche können die Qualität der Abgüsse beeinträchtigen.Another possibility of shaping contours that do not conform to the shape is offered by full molding technology: with gasifiable models. Here, the molded model is just before or destroyed during pouring. The application of this method has its limits in the stability of the usable foamed plastic, which opposes a relatively low resistance to compression molding. This can lead to warpage or dimensional deviations on the castings. A new model must be created for each cast, which is then completely gasified. Relatively large amounts of gas must be removed during casting. The residues on the casting surface can affect the quality of the castings.
Es wird ein Verfahren vorgeschlagen, mit welchem problem¬ los ohne die vorstehend genannten Nachteile Gußstücke mit nicht formgerechten Konturen erstellt werden können.A method is proposed with which castings with contours that do not conform to the shape can be produced without problems and without the disadvantages mentioned above.
Erfindungsgemäß wird dieses erreicht durch die im Kennzeichen des Patentanspruches 1 genannten Maßnahmen.According to the invention this is achieved by the measures mentioned in the characterizing part of patent claim 1.
Von den beiden bekannten Formverfahren mit wieder ver¬ wendbaren und mit vergasbaren Modellen werden die je¬ weiligen Vorteile genutzt« Gegenüber der reinen Voll¬ formtechnik bleibt die erforderliche Maßgenauigkeit er- halten, weil die Funktionsmaße, die formgerechtenThe respective advantages are used by the two known molding processes with reusable and gasifiable models. "Compared to the pure full molding technology, the required dimensional accuracy is maintained because the functional dimensions, the correct shape
Konturen und die Stützteile für die vergasbaren Modell¬ teile aus formstabilem Material gebildet s~i d. Es ist nicht nötig, während des Abgießens sehr große Volumina zu vergasen. Dadurch verbessert sich das Fließvermögen des Metalles, da geringere Gasdrücke entgegenstehen und die Gase leichter abgeführt werden können. Es ent¬ stehen auch geringere Rückstände im Formhohlraum, was die Oberflächenqualität der Gußstücke wesentlich ver¬ bessert. Außerdem werden die Kosten und der Aufwand für die bisher erforderliche Herstellung von Vollform- Modellen wesentlich reduziert. Gegenüber der üblichen Formtechnik mit wieder verwend¬ baren Modellen ergeben sich beanspruchungsgerechtere Gestaltungsmδglichkeiten, da man nicht mehr an die Form¬ gerechtigkeit gebunden ist. Losteile, die nachträglich der Form zu entnehmen sind, können entfallen. Form- technisch schwierige Konturen sind ohne Kerne leicht herstellbar. Das führt zu einer Verbilligung und gleich¬ zeitig zu einem Ausschalten von Fehlerquellen.Contours and the support parts for the gasifiable Modell¬ parts of dimensionally stable material formed s ~ i d. It is not necessary to gas very large volumes during pouring. This improves the fluidity of the metal, since lower gas pressures are opposed and the gases can be removed more easily. There are also smaller residues in the mold cavity, which significantly improves the surface quality of the castings. In addition, the costs and effort for the previously required production of full-form models are significantly reduced. Compared to the usual molding technology with reusable models, there are more design options that meet the demands, since one is no longer bound to the correct form. Loose parts that can subsequently be removed from the mold can be omitted. Technically difficult contours are easy to produce without cores. This leads to a reduction in price and, at the same time, to the elimination of error sources.
Das erfindungsgemäße Verfahren erreicht seine besonderen Vorzüge in Verbindung mit der bekannten Vakuum-Form¬ technik. Dieses Formverfahren ist geeignet zur Her¬ stellung von Abgüssen mit hoher Maßgenauigkeit auch bei größeren Abmessungen, da der Formstoff durch das Fehlen von Bindern leicht zu dichtester Kernpackung gerüttelt werden kann. Die hohe Verdichtung läßt den Einsatz von größeren Vollform-Modellen nicht zu. Die Labilität dieses Modellwerkstoffes führt sonst zu maßlich unge¬ nauen Abgüssen.The process according to the invention achieves its particular advantages in connection with the known vacuum molding technology. This molding process is suitable for the production of castings with high dimensional accuracy even with larger dimensions, since the lack of binders means that the molding material can easily be shaken to form the densest core packing. The high compression does not allow the use of larger full-form models. The instability of this model material otherwise leads to dimensionally inaccurate castings.
Für die jetzt vorgeschlagene kombinierte Technik ist das Vakuum-Formverfahren hingegen hervorragend geeignet. Die relativ kleinen, vergasbaren Modellteile verformen sich durch die hohen Drücke nur minimal. Sie ermöglichen auf der Gegenseite ein Formen ohne Losteile und ohne Kerne, was beim Vakuum-Formverfahren mit gewissen Problemen verbunden ist. Die beigefügte Zeichnung stellt ein Ausführungsbeispiel der Erfindung dar. Es zeigt:In contrast, the vacuum molding process is outstandingly suitable for the combined technology now proposed. The relatively small, gasifiable model parts deform only minimally due to the high pressures. On the other side, they enable molding without loose parts and without cores, which is associated with certain problems in the vacuum molding process. The accompanying drawing shows an embodiment of the invention. It shows:
Fig. 1 : Einen Querschnitt durch das Modell eines Tübbings, Fig. 2: Einen Querschnitt durch eine Form mit eingeformtem Modell,1: a cross section through the model of a segment, FIG. 2: a cross section through a mold with a molded model,
Fig. 3: Einen Querschnitt durch eine Formhälfte .während des Herausnehmens des Modelies und Fig. 4: Einen Querschnitt durch die fertige Form vor demFig. 3: A cross section through a mold half .when the model is removed and Fig. 4: A cross section through the finished mold in front of the
Abgießen.Pour off.
Der Tübbing besitzt eine Verrippung aus im Querschnitt L- und T-förmigen Rippen. Die formgerechten Konturen der vertikalen Rippenstege sind als wieder verwendbare Modell¬ teile 1 ausgebildet. Die nicht formgerechten Konturen der horizontalen Rippenflansche bilden vergasbare Modellteile 2, Die vergasbaren Modellteile 2 sind an den anderenThe tubbing has ribs made of L-shaped and T-shaped ribs. The correct contours of the vertical ribs are designed as reusable model parts 1. The contours of the horizontal rib flanges that do not conform to the shape form gasifiable model parts 2, the gasifiable model parts 2 are on the other
Modellteilen 1 so gelagert, daß diese nach dem Einformen in üblicher Weise senkrecht aus der Form herausgezogen werden können. Der dargestellte Tübbing stellt einen bevorzugten Anwendungsfall dar. Selbstverständlich ist auc jede andere Art und Form der Modellteile 1,2 denkbar. So können die vergasbaren Modellteile 2 seitlich an den wie¬ der verwendbaren Modellteilen 1 gelagert sein oder diese in Teilbereichen umgeben. Das Modell nach Fig. 1 wird nach Fig. 2 in eine Form 3 exngeformt. Zur Anwendung des Vakuum-Formverfahrens wird es hierzu mit einer Folie 4 überzogen. An die Form 3 wird dann eine Unterdruckquelle 5 angeschlossen. Nach Fig. 3 werden nur die wieder verwendbaren Modellteil mit den formgerechten Konturen aus der Form herausgezogen. Die vergasbaren Modellteile 2 bleiben in der Form 37 die in ihrem Endzustand in Fig. 4 dargestellt ist. Sie werden während des Abgießens durch die flüssige Schmelze zerstör Bei den bisher bekannten Formverfahren hätte man ent¬ weder eine formgerechte Konstruktion entwickeln oder mit Losteilen bzw. Kernen arbeiten müssen. Reine Voll¬ form-Modelle hätten die beschriebenen Nachteile gehabt. Sie wären zudem für eine Serienfertigung auch viel zu teuer geworden. Model parts 1 stored so that they can be pulled out of the mold vertically after molding in the usual manner. The tubbing shown represents a preferred application. Of course, any other type and shape of the model parts 1, 2 is also conceivable. Thus, the gasifiable model parts 2 can be mounted laterally on the reusable model parts 1 or surround them in partial areas. The model according to FIG. 1 is exnformed into a mold 3 according to FIG. 2. To use the vacuum molding process, it is covered with a film 4 for this purpose. A vacuum source 5 is then connected to the mold 3. According to FIG. 3, only the reusable model parts with the correct contours are pulled out of the mold. The gasifiable model parts 2 remain in the form 3 7 which is shown in its final state in FIG. 4. They are destroyed by the liquid melt during pouring With the previously known molding processes, one would either have to develop a design that conformed to the shape or would have to work with loose parts or cores. Pure full-form models would have had the disadvantages described. They would also have become far too expensive for series production.

Claims

Patentansprüche Claims
1. Verf hren zur Erzeugung von Gußstücken mit teil¬ weise nicht formgerechten Konturen, dadurch gekennzeichnet, daß ein Modell aus vergasbaren Modellteilen (2) zur Ausbildung von nicht formgerechten Konturen und aus wieder verwendbaren Modellteilen (1) zusammengesetzt wird und daß nach dem Einformen nur die wieder verwendbaren Modellteile (1) aus der Form (3) ent¬ fernt und die vergasbaren Modellteile (2) während des Ab¬ gießens zerstört werden.1. Procedure for the production of castings with partially non-conformal contours, characterized in that a model of gasifiable model parts (2) for the formation of non-conformal contours and reusable model parts (1) is assembled and that only after molding the reusable model parts (1) are removed from the mold (3) and the gasifiable model parts (2) are destroyed during the casting.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß ein Modell zur Fertigung von Tübbingen eine Verrippung aus im Querschnitt L- und/oder T-förmigen Rippen besitzt wobei nach dem Einformen nur die vertikalen Rippenstege als wieder verwendbare Modell- teile (1) aus der Form (3) entfernt und die horizontalen Rippenflansche als vergasbare Modellteile (2) während des Abgießens zerstört werden.2. The method according to claim 1, characterized in that a model for the production of tubbings has ribs of cross-sectionally L- and / or T-shaped ribs, wherein after molding only the vertical ribs as reusable model parts (1) the mold (3) removed and the horizontal rib flanges as gasifiable model parts (2) are destroyed during the casting.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß das Modell aus vergasbaren und wieder verwendbaren Modellteilen (2,1) mit einer Folie (4) überzogen, in bindemittelfreien Formstoff eingebettet und die so erstellte Form vor dem Entfernen sowie Zer¬ stören der Modeliteile (1,2) an eine. Unterdruckquelle (5) angeschlossen wird. 3. The method according to claim 1, characterized in that the model of gasifiable and reusable model parts (2,1) coated with a film (4), embedded in binder-free molding material and the shape thus created before removing and destroying the model parts (1,2) to one. Vacuum source (5) is connected.
4. Modell zur Durchführung des Verfahrens nach Anspr. 1 dadurch gekennzeichnet, daß es aus vergasbaren Modell¬ teilen (2) zur Ausbildung von nicht formgerechten Konturen und aus wieder verwendbaren Modellteilen (1) besteht.4. Model for performing the method according to claim 1 characterized in that it consists of gasifiable model parts (2) for forming non-conforming contours and of reusable model parts (1).
5. Modell nach Anspruch 4, dadurch gekennzeichnet, daß es zur Fertigung von Tübbingen eine Verrippung aus im Querschnitt L - und/oder T-för'migen Rippen besitzt, wobei vergasbare Modellteile (2) die horizontalen Rippenflansche und wieder verwendbare Modell¬ teile (1) die vertikalen Rippenstege bilden.5. Model according to claim 4, characterized in that for the production of lining segments ribbing of cross-sectionally L - '-shaped ribs owns and / or T-för wherein gasifiable pattern parts (2) share the horizontal rib flanges, and reusable Modell¬ ( 1) form the vertical ribs.
6. Modell nach Anspruch 4, dadurch gekennzeichnet, daß die vergasbaren Modellteile (2) n senkrechten Führungen an den wieder verwendbaren Modellteilen (1) gelagert sind. 6. Model according to claim 4, characterized in that the gasifiable model parts (2) n vertical guides on the reusable model parts (1) are mounted.
EP85901972A 1984-04-21 1985-04-17 Process for producing cast components and pattern for use of this process Expired EP0179100B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85901972T ATE31643T1 (en) 1984-04-21 1985-04-17 PROCESS FOR PRODUCTION OF CASTINGS AND MODEL FOR CARRYING OUT THE PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3415232 1984-04-21
DE3415232A DE3415232C2 (en) 1984-04-21 1984-04-21 Process for the production of castings and model for the implementation of the process

Publications (2)

Publication Number Publication Date
EP0179100A1 true EP0179100A1 (en) 1986-04-30
EP0179100B1 EP0179100B1 (en) 1988-01-07

Family

ID=6234253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85901972A Expired EP0179100B1 (en) 1984-04-21 1985-04-17 Process for producing cast components and pattern for use of this process

Country Status (5)

Country Link
US (1) US4694879A (en)
EP (1) EP0179100B1 (en)
JP (1) JPS61501901A (en)
DE (2) DE3415232C2 (en)
WO (1) WO1985004826A1 (en)

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Publication number Priority date Publication date Assignee Title
CA2087763C (en) * 1992-02-11 2002-07-02 Jimmy Cochimin Stator frame for dynamoelectric machine and method for making same
EP0730922A1 (en) * 1995-03-09 1996-09-11 Passavant-Werke Ag Method for producing castings which are later connected to concrete
US7082984B2 (en) * 2004-07-30 2006-08-01 Dana Corporation Article casting method
US7900684B2 (en) * 2007-07-16 2011-03-08 Waukesha Foundry, Inc. In-place cope molding for production of cast metal components

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DE1917893U (en) * 1965-02-13 1965-06-16 Gruenzweig & Hartmann LOST LOOSE ITEM, IN PARTICULAR SPHERICAL SPEISER MODEL MADE OF FOAMED PLASTIC.
US3518586A (en) * 1968-06-17 1970-06-30 Ford Motor Co Electronic tuning device utilizing binary counters and memory system
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Also Published As

Publication number Publication date
JPS61501901A (en) 1986-09-04
DE3415232A1 (en) 1985-10-31
EP0179100B1 (en) 1988-01-07
WO1985004826A1 (en) 1985-11-07
US4694879A (en) 1987-09-22
DE3561289D1 (en) 1988-02-11
DE3415232C2 (en) 1986-04-10

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