EP0115848B1 - Method and equipment for separating a pattern from a mould - Google Patents

Method and equipment for separating a pattern from a mould Download PDF

Info

Publication number
EP0115848B1
EP0115848B1 EP84100992A EP84100992A EP0115848B1 EP 0115848 B1 EP0115848 B1 EP 0115848B1 EP 84100992 A EP84100992 A EP 84100992A EP 84100992 A EP84100992 A EP 84100992A EP 0115848 B1 EP0115848 B1 EP 0115848B1
Authority
EP
European Patent Office
Prior art keywords
pattern
mold
gear
air
pattern plate
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.)
Expired - Lifetime
Application number
EP84100992A
Other languages
German (de)
French (fr)
Other versions
EP0115848A3 (en
EP0115848A2 (en
Inventor
Eugen Dipl.-Ing. Bühler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0115848A2 publication Critical patent/EP0115848A2/en
Publication of EP0115848A3 publication Critical patent/EP0115848A3/en
Application granted granted Critical
Publication of EP0115848B1 publication Critical patent/EP0115848B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C17/00—Moulding machines characterised by the mechanism for separating the pattern from the mould or for turning over the flask or the pattern plate

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 4.
  • a method and a device of this type are known from US-A 1 475 935.
  • the formation of a gap in the region of the model flanks with respect to the model plate cannot be avoided when the model is lifted from the shape produced.
  • the compressed air used to support the lifting of the model can escape through this gap, the speed of the escaping compressed air being very high with a small gap cross section, so that practically a sharp jet results.
  • the compressed air will drag molding sand away from the edges of the mold cavity. The consequence of this is that the castings produced later have considerable burrs in the area of the mold division, which have to be ground down in the casting cleaning shop, which can be very expensive.
  • the measures according to the invention ensure that the compressed air cannot escape from the gap-like space before it is relieved. Since, when the gap-shaped space is relieved, the pressurized air has already ended and, as a rule, a slow expansion of the compressed air enclosed in the space has already started, there is advantageously no longer-lasting, sharp outflow of the compressed air from the gap-shaped space, which is extremely gentle affects the shape edges.
  • a still further security with a simultaneous strong noise reduction can be achieved in an advantageous manner by the measures of claim 2.
  • the device-related solution to the above object consists in the characterizing measures of claim 4.
  • the gas-tight connection can be formed by the measure of claim 10. This advantageously results in a purely metallic type of sealing.
  • Another type of gas-tight seal is contained in claims 11 and 12.
  • the preferably inflatable elastomer seal used here ensures particularly high reliability.
  • the model plate carrier can expediently be divided by vertical dividing walls into at least two air chambers which can be acted upon with different pressures.
  • a central air chamber is advantageously provided underneath or, in the case of double-sided model plate supports, also above the models and is operatively connected to air passage openings in these.
  • This central air chamber is surrounded by a second air chamber which is operatively connected to air passage openings outside the model plate edge.
  • both air chambers can be connected in parallel or filled with air of different pressure or evacuated independently of one another. To fill the molding box with molding sand, for example, both chambers are suddenly placed under vacuum.
  • the outer air chamber can be connected to normal external pressure and the central air chamber can be pressurized with air of increased pressure.
  • the inner air chamber is expediently connected to an air chamber below or in the elastomer seal via an air line with a built-in differential pressure check valve. It is thereby achieved that with the increase in air pressure in the central air chamber, the elastomer seal is simultaneously inflated and pressed sealingly against the edge of the molding box. It follows it for a sufficiently long distance, and so far until the model and the mold have moved so far apart that a gap-shaped compressed air-filled space has formed between them.
  • the elastomer seal does not immediately return to its rest position , but only after a certain delay, because the check valve only opens the flow path to the central chamber when the pressure difference is slightly more than 1 bar. In this way, the undesired effect described above is eliminated.
  • the molded part of the vacuum molding machine which works according to the vacuum shooting principle with mechanical post-compression, consists of a hollow model plate carrier 1, which is divided by vertical partition walls 2 into a central air chamber 3 and an outer air chamber 4 surrounding it.
  • the upper and lower walls of the central air chamber 3 form an upper and lower model plate 5, 5 ', which are covered with the respective model halves 6, 6'.
  • the air chambers 3, 4 can be supplied with air or air 7, 8 respectively assigned to them via a valve circuit (not shown), both together and independently of one another, with vacuum or air, wherein different pressures can also be generated in the chambers.
  • Each air chamber is connected to the interior of an upper and lower mold box 10, 10 'via air passage openings 9, which are closed in a sand-tight manner by means of inserted filter nozzles or glued-on screen foils, which is vertically adjustable by means of a stripping cylinder (not shown).
  • the mold boxes are dimensioned so that their inner walls can slide a limited distance on the perpendicular outer walls of the model plate carrier 1 and a likewise vertically adjustable upper and lower shooting head 11, 11 'and thereby form a sufficiently airtight connection.
  • the shooting heads 11, 11 ' have shooting grates which can be closed after the shot has been fired and which act as a pressing grate for mechanical post-compression.
  • the outer edge of the model plate carrier 1 forms the compressed air-tight connection with the inner edge of the molding box 10, 10 'in the embodiment according to FIG. 1, in the embodiment according to FIGS. 2 and 3 there is an inflatable elastic seal 14 between the molding box 10 and the model plate carrier 1 provided.
  • the seal 14 is inserted into recesses in the model plate carrier 1, which in this case also acts as a molding box carrier, and is held by means of clamping strips 15. It has a Q-shaped cross section and its interior communicates with the central air chamber via air channels 16, 17 and a differential pressure check valve 18 inserted therein.
  • the compressed air supply is shut off with the aid of a sensor switch and the compressed air present in the system is decelerated by the outer air chamber 4 and air line 8 by a throttle valve (not shown).
  • the air cannot suddenly escape between the model plate carrier and the molding box edge, because the gap width of the space S in the exemplary embodiment according to FIG. 1 is smaller than the overlap length between the model plate carrier and the molding box.
  • the casting mold halves are then stripped to the height of the mold box edge on the mold division in the further course of the lifting process.
  • the gap S is bridged by the inflated seal 14, which is only vented again via the valve 18 when the air pressure in the central air chamber 3 is at least 1 bar lower than in the interior of the seal 14 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)

Description

Die Erfindung betrifft ein Verfahren gemäß Oberbegriff des Anspruchs 1 sowie eine Vorrichtung gemäß Oberbegriffs des Anspruchs 4.The invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 4.

Ein Verfahren und eine Vorrichtung dieser Art sind aus der US-A 1 475 935 bekannt. Infolge der bei Modellen üblicherweise vorhandenen Gußschrägen ist beim Abheben des Modells von der hergestellten Form die Bildung eines Spalts auch im Bereich von bezüglich der Modellplatte stehenden Modellflanken nicht vermeidbar. Bei der bekannten Anordnung kann über diesen Spalt die zur Unterstützung des Abhebens des Modells verwendete Druckluft entweichen, wobei bei kleinem Spaltquerschnitt die Geschwindigkeit der entweichenden Druckluft sehr hoch ist, so daß sich praktisch ein scharfer Strahl ergibt. Hierbei besteht die Gefahr, daß die Druckluft Formsand von den Kanten des Formhohlraums mitreißt. Die Folge davon ist, daß die später hergestellten Gußstücke im Bereich der Formteilung erhebliche Grate aufweisen, die in der Gußputzerei abgeschliffen werden müssen, was einen hohen Aufwand verursachen kann.A method and a device of this type are known from US-A 1 475 935. As a result of the casting bevels usually present in models, the formation of a gap in the region of the model flanks with respect to the model plate cannot be avoided when the model is lifted from the shape produced. In the known arrangement, the compressed air used to support the lifting of the model can escape through this gap, the speed of the escaping compressed air being very high with a small gap cross section, so that practically a sharp jet results. There is a risk that the compressed air will drag molding sand away from the edges of the mold cavity. The consequence of this is that the castings produced later have considerable burrs in the area of the mold division, which have to be ground down in the casting cleaning shop, which can be very expensive.

Diese Nachteile dürften dafür maßgebend gewesen sein, daß sich das durch Druckluft unterstützte Abheben des Modells von einer Form bisher bei Verwendung üblicher Formsande nicht durchsetzen konnte. Man hat bisher dieses Verfahren lediglich da verwendet, wo mit aushärtbaren Masken versehene. Formen hergestellt wurden, wie die GB-A 11 51 237 zeigt.These disadvantages should have been decisive for the fact that the lifting of the model from a mold, which was supported by compressed air, could not prevail up to now when using conventional molding sands. So far, this method has only been used where there are curable masks. Molds were produced, as GB-A 11 51 237 shows.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, ein Verfahren und eine Vorrichtung eingangs erwähnter Art mit einfachen und kostengünstigen Mitteln so zu verbessern, daß auch eine aus üblichem Formsand bestehende Gießform unbeschädigt von der Modelleinrichtung getrennt werden kann.Proceeding from this, it is therefore the object of the present invention to improve a method and a device of the type mentioned at the beginning with simple and inexpensive means so that even a casting mold consisting of conventional molding sand can be separated from the model device in an undamaged manner.

Die verfahrensmäßige Lösung dieser Aufgabe besteht in den kennzeichnenden Maßnahmen des Anspruchs 1.The procedural solution to this problem consists in the characterizing measures of claim 1.

Die erfindungsgemäßen Maßnahmen stellen sicher, daß die Druckluft vor Entlastung des spaltförmigen Zwischenraums nicht aus diesem entweichen kann. Da bei Entlastung des spaltförmigen Zwischenraums die Druckluftbeaufschlagung bereits beendet ist und in der Regel bereits eine langsame Entspannung der im Zwischenraum eingeschlossenen Druckluft einsetzen konnte, ergibt sich in vorteilhafter Weise auch kein länger anhaltendes, scharfes Abströmen der Druckluft aus dem spaltförmigen Zwischenraum, was sich äußerst schonend auf die Formkanten auswirkt.The measures according to the invention ensure that the compressed air cannot escape from the gap-like space before it is relieved. Since, when the gap-shaped space is relieved, the pressurized air has already ended and, as a rule, a slow expansion of the compressed air enclosed in the space has already started, there is advantageously no longer-lasting, sharp outflow of the compressed air from the gap-shaped space, which is extremely gentle affects the shape edges.

Eine noch weitergehende Sicherheit bei gleichzeitiger starker Geräuschminderung läßt sich in vorteilhafter Weise durch die Maßnahmen des Anspruchs 2 erreichen.A still further security with a simultaneous strong noise reduction can be achieved in an advantageous manner by the measures of claim 2.

Die vorrichtungsmäßige Lösung der obengenannten Aufgabe besteht in den kennzeichnenden Maßnahmen des Anspruchs 4.The device-related solution to the above object consists in the characterizing measures of claim 4.

Diese Maßnahmen ergeben eine einfache und robuste Ausführung, die sich in vorteilhafter Weise selbst steuert bzw. steuerungstechnisch leicht beherrschbar ist.These measures result in a simple and robust design, which controls itself in an advantageous manner or is easy to control in terms of control technology.

In vorteilhafter Weiterbildung kann die gasdichte Verbindung durch die Maßnahme des Anspruchs 10 gebildet werden. Hierbei ergibt sich in vorteilhafter Weise eine rein metallische Art der Abdichtung. Eine andere Art der gasdichten Abdichtung ist in den Ansprüchen 11 und 12 enthalten. Die hierbei Verwendung findende, vorzugsweise aufblasbare Elastomerdichtung gewährleistet eine besonders hohe Zuverlässigkeit.In an advantageous development, the gas-tight connection can be formed by the measure of claim 10. This advantageously results in a purely metallic type of sealing. Another type of gas-tight seal is contained in claims 11 and 12. The preferably inflatable elastomer seal used here ensures particularly high reliability.

Der Modellplattenträger kann dabei zweckmäßig durch vertikale Trennwände in mindestens zwei, mit unterschiedlichen Drücken beaufschlagbare Luftkammern unterteilt sein. Dabei ist vorteilhaft eine zentrale Luftkammer unter- bzw. bei doppelseitig belegtem Modellplattenträger auch über- den Modellen vorgesehen und steht mit Luftdurchtrittsöffnungen in diesen in Wirkverbindung. Diese zentrale Luftkammer ist von einer zweiten Luftkammer umgeben, die mit Luftdurchtrittsöffnungen außerhalb des Modellplattenrandes in Wirkverbindung steht. Über eine Ventilschaltung können beide Luftkammern parallel geschaltet werden oder unabhängig voneinander mit Luft verschiedenen Druckes gefüllt, bzw. evakuiert werden. Zum Füllen des Formkastens mit Formsand werden beispielsweise beide Kammern schlagartig unter Vakuum gesetzt. Zum Aussenken oder Abheben der Modelleinrichtung kann dagegen die äußere Luftkammer mit normalem Außendruck verbunden und die zentrale Luftkammer mit Luft erhöhten Druckes beaufschlagt werden. Die innere Luftkammer steht dabei zweckmäßig über eine Luftleitung mit eingebautem Differenzdruck-Rückschlagventil mit einer Luftkammer unter oder in der Elastomerdichtung in Verbindung. Dadurch wird erreicht, daß mit dem Ansteigen des Luftdruckes in der zentralen Luftkammer die Elastomerdichtung gleichzeitig aufgeblasen und abdichtend gegen den Rand des Formkastens gedrückt wird. Sie folgt ihm eine ausreichend lange Strecke, und zwar so weit, bis sich Modell und Gießform so weit voneinander entfernt haben, daß zwischen ihnen ein spaltförmiger druckluftgefüllter Raum entstanden ist. Wenn dann die Druckluftzufuhr zur zentralen Kammer abgeschaltet wird und der Druck in dem erwähnten spaltförmigen Raum absenkt, weil ein Teil der Druckluft durch die poröse Gießform entweicht und ein anderer Teil in die äußere Luftkammer im Modellplattenträger abfließt, geht die Elastomerdichtung nicht sofort in ihre Ruhelage zurück, sondern erst nach einer gewissen Verzögerung, weil das Rückschlagventil erst bei einer Druckdifferenz von etwas mehr als 1 bar den Fließweg zur zentralen Kammer öffnet. Auf diese Art wird der eingangs geschilderte unerwünschte Effekt ausgeschaltet.In this case, the model plate carrier can expediently be divided by vertical dividing walls into at least two air chambers which can be acted upon with different pressures. In this case, a central air chamber is advantageously provided underneath or, in the case of double-sided model plate supports, also above the models and is operatively connected to air passage openings in these. This central air chamber is surrounded by a second air chamber which is operatively connected to air passage openings outside the model plate edge. Via a valve circuit, both air chambers can be connected in parallel or filled with air of different pressure or evacuated independently of one another. To fill the molding box with molding sand, for example, both chambers are suddenly placed under vacuum. To lower or raise the model device, on the other hand, the outer air chamber can be connected to normal external pressure and the central air chamber can be pressurized with air of increased pressure. The inner air chamber is expediently connected to an air chamber below or in the elastomer seal via an air line with a built-in differential pressure check valve. It is thereby achieved that with the increase in air pressure in the central air chamber, the elastomer seal is simultaneously inflated and pressed sealingly against the edge of the molding box. It follows it for a sufficiently long distance, and so far until the model and the mold have moved so far apart that a gap-shaped compressed air-filled space has formed between them. If the compressed air supply to the central chamber is then switched off and the pressure in the aforementioned gap-shaped space is reduced because part of the compressed air escapes through the porous mold and another part flows into the outer air chamber in the model plate carrier, the elastomer seal does not immediately return to its rest position , but only after a certain delay, because the check valve only opens the flow path to the central chamber when the pressure difference is slightly more than 1 bar. In this way, the undesired effect described above is eliminated.

Die Erfindung ist anhand von Figuren beispielhaft erläutert. Dabei zeigen:

  • Figur 1 den eigentlichen Formteil einer für das gleichzeitige Formen von Ober- und Unterkasten eingerichteten Vakuum-Formmaschine,
  • Figur 2 eine Detailansicht eines Modellplattenträgers mit aufstehendem Formkasten, und
  • Figur 3 eine Detailansicht nach Figur 2 kurz nach Beginn des Abhebevorganges.
The invention is explained by way of example with reference to figures. Show:
  • Figure 1 shows the actual molded part for the simultaneous molding of upper and lower box established vacuum molding machine,
  • FIG. 2 shows a detailed view of a model plate carrier with a molded box standing up, and
  • Figure 3 shows a detailed view of Figure 2 shortly after the start of the lifting process.

Der Formteil der nach dem Unterdruckschießprinzip mit mechanischer Nachverdichtung arbeitenden Vakuum-Formmaschine besteht aus einem hohlen Modellplattenträger 1, der durch vertikale Trennwände 2 in eine zentrale Luftkammer 3 und eine diese umlaufend umgebende äußere Luftkammer 4 unterteilt ist. Die obere und untere Wandung der zentralen Luftkammer 3 bilden eine obere und untere Modellplatte 5, 5', die mit den jeweiligen Modellhälften 6, 6' belegt sind. Die Luftkammern 3, 4 können über ihnen jeweils zugeordnete Luftleitungen 7, 8 über eine nicht dargestellte Ventilschaltung sowohl gemeinsam als auch unabhängig voneinander mit Vakuum oder Luft beaufschlagt werden, wobei auch in den Kammern unterschiedlicher Druck erzeugt werden kann. Jede Luftkammer steht über Luftdurchtrittsöffnungen 9, die mittels eingesetzter Filterdüsen oder aufgeklebter Siebfolien sanddicht verschlossen sind, mit dem Innenraum eines oberen und unteren Formkastens 10, 10' in Verbindung, der mittels nicht dargestellter Strippzylinder vertikal verstellbar ist. Die Formkästen sind so bemessen, daß ihre Innenwände eine beschränkte Wegstrecke an den lottrechten Außenwänden des Modellplattenträgers 1 und eines ebenfalls vertikal verstellbaren oberen und unteren Schießkopfes 11, 11' gleiten können und dabei eine ausreichend luftdichte Verbindung bilden. Die Schießköpfe 11, 11' haben Schießroste, die nach erfolgtem Schuß geschlossen werden können und zur mechanischen Nachverdichtung als Preßrost wirken.The molded part of the vacuum molding machine, which works according to the vacuum shooting principle with mechanical post-compression, consists of a hollow model plate carrier 1, which is divided by vertical partition walls 2 into a central air chamber 3 and an outer air chamber 4 surrounding it. The upper and lower walls of the central air chamber 3 form an upper and lower model plate 5, 5 ', which are covered with the respective model halves 6, 6'. The air chambers 3, 4 can be supplied with air or air 7, 8 respectively assigned to them via a valve circuit (not shown), both together and independently of one another, with vacuum or air, wherein different pressures can also be generated in the chambers. Each air chamber is connected to the interior of an upper and lower mold box 10, 10 'via air passage openings 9, which are closed in a sand-tight manner by means of inserted filter nozzles or glued-on screen foils, which is vertically adjustable by means of a stripping cylinder (not shown). The mold boxes are dimensioned so that their inner walls can slide a limited distance on the perpendicular outer walls of the model plate carrier 1 and a likewise vertically adjustable upper and lower shooting head 11, 11 'and thereby form a sufficiently airtight connection. The shooting heads 11, 11 'have shooting grates which can be closed after the shot has been fired and which act as a pressing grate for mechanical post-compression.

Während bei dem Ausführungsbeispiel nach Figur 1 der äußere Rand des Modellplattenträgers 1 mit dem inneren Rand des Formkastens 10, 10' die druckluftdichte Verbindung bildet, ist bei dem Ausführungsbeispiel nach den Figuren 2 und 3 eine aufblasbare elastische Dichtung 14 zwischen dem Formkasten 10 und dem Modellplattenträger 1 vorgesehen. Die Dichtung 14 ist dabei in Ausnehmungen des Modellplattenträgers 1, der in diesem Fall gleichzeitig als Formkastenträger fungiert, eingesetzt und mittels Spannleisten 15 gehalten. Sie hat einen Q-förmigen Querschnitt, und ihr Innenraum steht über Luftkanäle 16, 17 und ein darin eingesetztes Differenzdruck-Rückschlagventil 18 mit der zentralen Luftkammer in Verbindung.While the outer edge of the model plate carrier 1 forms the compressed air-tight connection with the inner edge of the molding box 10, 10 'in the embodiment according to FIG. 1, in the embodiment according to FIGS. 2 and 3 there is an inflatable elastic seal 14 between the molding box 10 and the model plate carrier 1 provided. The seal 14 is inserted into recesses in the model plate carrier 1, which in this case also acts as a molding box carrier, and is held by means of clamping strips 15. It has a Q-shaped cross section and its interior communicates with the central air chamber via air channels 16, 17 and a differential pressure check valve 18 inserted therein.

Zum Abheben der verdichteten Gießform 19, 19' von der Modelleinrichtung und Aussenken der Modelle wird, gesteuert über eine Ventilschaltung, gleichzeitig mit der Betätigung der die Formkästen 10, 10' verstellenden Strippzylinder durch die Luftleitungen 7, 8 Druckluft in die zentrale Luftkammer 3 und die äußere Luftkammer 4 eingeleitet. Der Druck der Luft in der äußeren Luftkammer 4 kann dabei niedriger eingestellt sein als der Druck in der zentralen Luftkammer 3. Die eingeleitete Luft drückt durch die Luftdurchtrittsöffnungen 9 gegen die Gießformoberfläche und unterstützt deren Ablösen besonders im Betrieb tiefer Formballen entscheident.To lift the compressed mold 19, 19 'from the model device and lower the models, controlled via a valve circuit, simultaneously with the actuation of the stripping cylinders adjusting the mold boxes 10, 10' through the air lines 7, 8 compressed air into the central air chamber 3 and outer air chamber 4 initiated. The pressure of the air in the outer air chamber 4 can be set lower than the pressure in the central air chamber 3. The air introduced presses through the air passage openings 9 against the mold surface and supports its detachment, particularly during operation of deep mold bales.

Sobald sich bei Abhebevorgang ein spaltförmiger Raum S zwischen Gießform- und Modelloberfläche gebildet hat, wird mit Hilfe eines Fühlschalters die Druckluftzufuhr abgesperrt und die im System vorhandene Druckluft durch die äußere Luftkammer 4 und Luftleitung 8 durch ein nicht dargestelltes Drosselventil gebremst entspannt.As soon as a gap-shaped space S has formed between the casting mold and model surface during the lifting process, the compressed air supply is shut off with the aid of a sensor switch and the compressed air present in the system is decelerated by the outer air chamber 4 and air line 8 by a throttle valve (not shown).

Bis zu diesem Zeitpunkt kann die Luft nicht schlagartig zwischen Modellplattenträger und Formkastenrand entweichen, denn die Spaltbreite des Raumes S ist im Ausführungsbeispiel nach Figur 1 kleiner als die Überlappungslänge zwischen Modellplattenträger und Formkasten. Die Gießformhälften werden bei dieser Ausführungsform dann im weiteren Verlauf des Abhebevorganges bis auf die Höhe des Formkastenrandes an der Formteilung nachgestrippt. Bei der Ausführungsform nach den Figuren 2 und 3 wird der Spalt S durch die aufgeblasene Dichtung 14 überbrückt, die über das Ventil 18 erst wieder entlüftet wird, wenn der Luftdruck in der zentralen Luftkammer 3 um mindestens 1 bar niedriger liegt als im Innenraum der Dichtung 14.Up to this point in time, the air cannot suddenly escape between the model plate carrier and the molding box edge, because the gap width of the space S in the exemplary embodiment according to FIG. 1 is smaller than the overlap length between the model plate carrier and the molding box. In this embodiment, the casting mold halves are then stripped to the height of the mold box edge on the mold division in the further course of the lifting process. In the embodiment according to FIGS. 2 and 3, the gap S is bridged by the inflated seal 14, which is only vented again via the valve 18 when the air pressure in the central air chamber 3 is at least 1 bar lower than in the interior of the seal 14 .

Claims (12)

1. A method for separating a pattern (6 and 6') from a mold (19 and 19') of compacted molding material preferably containing a binder, by mutual relative motion, in which respect for aiding the detachment of the pattern (6 and 6') from the mold (19 and 19') compressed air is directed against the surface of the molding material on the pattern side, characterized in that an initial condition with a gas-tight mutual sealing of the mold gear (10 and 10') and the pattern gear (1, and 5') is produced and in that this seal between the mold gear (10 and 10') and the pattern gear (1, 5 and 5') is maintained, while subjecting the mold material surface on the pattern side to compressed air, at least until the pattern (6 and 6') is completely detached from the mold material surface and between same a gap-like intermediate space (S), sealed from the outside, has been created, the action of compressed air thereon being halted before the mutual sealing effect is brought to an end.
2. The method as claimed in claim 1, characterized in that the compressed air is let off from the gap-like intermediate space (S) after termination of the supply of compressed air and such air is allowed to expand, before the mutual sealing effect between the pattern gear (1, 5 and 5') and the mold gear (10 and 10') is discontinued.
3. The method as claimed in any one preceding claim, characterized in that the mold (19) is subsequently stripped after relieving the gap-like intermediate space (S) as far as the plane of the edge of an associated flask (10 and 10').
4. An apparatus for performing the method as claimed in at least one of the preceding claims comprising pattern gear and mold gear able to be moved in relation thereto, said pattern gear comprising at least one pattern plate (5 and 5') receiving a pattern (6) and mounted on a pattern plate carrier (1), and the mold gear has at least one flask (10 and 10') able to be filled with a mold material and received on a flask carrier, and the pattern plate (5 and 5') and/or the pattern (6 and 6') has air orifices (9), characterized in that the pattern gear (1, 5 and 5') and the mold gear (10 and 10') in the vicinity of the mutually adjacent edges thereof at least adjacent to one part of their mutual stroke engage each other in a gas-tight manner.
5. The apparatus as claimed in claim 4, characterized in that the flow path able to be produced prior to the discontinuance of a gas-tight connection between the pattern gear (1, 5 and 5') and the mold gear (10 and 10') in order to relieve the gap-like intermediate space (S) has such a narrow cross section that there is a slow drop in pressure in the gap-like intermediate space.
6. The apparatus as claimed in either of the preceding claims 4 and 5, characterized by a hollow pattern plate carrier (1) bearing a pattern plate (5 and 5') on either side, and this carrier forms a gas-tight sliding joint with the associated flask (10 and 10') and through the same the compressed air may be let off from the gap-like intermediate space.
7. The apparatus as claimed in any one of the preceding claims 4 through 6, characterized in that the hollow pattern plate carrier (1) is subdivided by vertical partitions (2) into at least two air chambers (3 and 4) able to be subjected to different pressures.
8. The apparatus as claimed in any one of the preceding claims 4 through 7, characterized in that the flask (10 and 10') is arranged on a stripping device in a moving manner.
9. The apparatus as claimed in any one of the preceding claims 4 through 8, characterized in that the pattern plate carrier (1) has a central air chamber (3), which is operationally connected by air orifices (9) in the pattern plate (5 and 5') and the patterns (6 and 6') with the mold cavity in the flask (10 and 10') and which is surrounded by an air chamber (4), which is operationally connected with air orifices (9) clear of the pattern (6 and 6') and preferably clear of the pattern plate (5 and 5').
10. The apparatus as claimed in any one of the preceding claims 4 through 9, characterized in that the flask (10 and 10') fits round the outer edge of the pattern plate (5 and 5') or of the pattern plate carrier (1) and with the latter forms a gas-tight sliding joint.
11. The apparatus as claimed in any one of the claims 4 through 10, characterized in that between the pattern gear and the mold gear there is an elastic seal (14).
12. The apparatus as claimed in claim 11, characterized in that the elastic seal (14) is able to be acted upon on one side by compressed air and is able to be inflated, and in the case of there being a plurality of air chambers (3 and 4) of the pattern plate carrier (1) subject to different pressures the seal (14) is connected via an air pipe wjth a differential pressure check valve (18) thereon with one of the air chambers (3 and 4) preferably the air chamber (4) able to be subjected to the higher air pressure.
EP84100992A 1983-02-08 1984-02-01 Method and equipment for separating a pattern from a mould Expired - Lifetime EP0115848B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3304148A DE3304148C1 (en) 1983-02-08 1983-02-08 Process and device for compressed air-assisted lifting and lowering of models from casting molds
DE3304148 1983-02-08

Publications (3)

Publication Number Publication Date
EP0115848A2 EP0115848A2 (en) 1984-08-15
EP0115848A3 EP0115848A3 (en) 1988-01-13
EP0115848B1 true EP0115848B1 (en) 1990-05-09

Family

ID=6190239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100992A Expired - Lifetime EP0115848B1 (en) 1983-02-08 1984-02-01 Method and equipment for separating a pattern from a mould

Country Status (4)

Country Link
US (1) US4593740A (en)
EP (1) EP0115848B1 (en)
JP (1) JPS59153547A (en)
DE (2) DE3304148C1 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3507179C1 (en) * 1985-03-01 1985-10-31 Eugen Dipl.-Ing. 8877 Burtenbach Bühler Method and device for producing boxless molds
JPS6336950A (en) * 1986-07-29 1988-02-17 オイゲン・ビ−ラ− Method and device for manufacturing mold, etc.
US4791974A (en) * 1987-05-18 1988-12-20 Dansk Industri Syndikat A/S Method and an apparatus for producing shaped bodies from particulate material
DE3717558C3 (en) * 1987-05-25 1997-04-03 Kuenkel Wagner Prozesstechnolo Process for making sand molds of models
DE3813755A1 (en) * 1988-04-23 1989-11-02 Wagner Heinrich Sinto Masch Pattern arrangement
DE3828436C1 (en) * 1988-08-22 1989-12-21 Eugen Dipl.-Ing. 8877 Burtenbach De Buehler Method for the impulse compaction of moulding sand
DE3916530C2 (en) * 1989-05-20 1996-11-07 Buehler Eisengieserei Gmbh Process for the production of casting molds by pulse compression
DE8912107U1 (en) * 1989-10-11 1990-10-25 Achinger, Michael, 8900 Augsburg, De
US5853042A (en) * 1998-02-26 1998-12-29 Hunter Automated Machinery Corporation Drag mold release mechanism
US8377361B2 (en) * 2006-11-28 2013-02-19 Wei Zhang Imprint lithography with improved substrate/mold separation
US8747092B2 (en) 2010-01-22 2014-06-10 Nanonex Corporation Fast nanoimprinting apparatus using deformale mold
US10105883B2 (en) 2013-03-15 2018-10-23 Nanonex Corporation Imprint lithography system and method for manufacturing
US10108086B2 (en) 2013-03-15 2018-10-23 Nanonex Corporation System and methods of mold/substrate separation for imprint lithography
BR112018068827A2 (en) * 2016-05-17 2019-01-22 Sintokogio Ltd molding machine without mold box
US10835952B2 (en) 2017-10-20 2020-11-17 Hunter Foundry Machinery Corporation Method and apparatus for forming sand molds via top and bottom pneumatic sand filling perpendicular to the pattern plate

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1475935A (en) * 1922-10-02 1923-12-04 Tabor Mfg Co Method and apparatus for forming sand molds
DE400266C (en) * 1922-10-02 1924-08-19 Wilfred Lewis Method and apparatus for facilitating the extraction of models from sand molds
GB611988A (en) * 1946-06-01 1948-11-05 Leonard Ogle Improvements in or relating to pattern plates for moulding machines
CH424097A (en) * 1962-03-23 1966-11-15 Hansberg Fritz Machine for the production of foundry molds and foundry cores as well as other molding compounds using compressed air
GB1151237A (en) * 1966-07-20 1969-05-07 Barnett Levy Method for Removing Sand Cores and Pattern Shells from Core Boxes and Patterns
US3512756A (en) * 1967-09-05 1970-05-19 Dike O Seal Inc Pressurizable elastomeric thrusting device
CH492494A (en) * 1969-03-14 1970-06-30 Buehrer Erwin Method for producing a foundry mold and device for carrying out the method
JPS5242085Y2 (en) * 1974-01-24 1977-09-24
JPS5944420B2 (en) * 1976-08-04 1984-10-29 遠州製作株式会社 How to hang a loom on a loom
NL7609734A (en) * 1976-09-01 1978-03-03 Ihc Holland Nv SEAL FOR THE LOOSENING OF A HOPPER OR SIMILAR BOTTOM LOOSER.
DE2653788C2 (en) * 1976-11-26 1981-08-27 Bühler, Eugen, Dipl.-Ing., 8871 Burtenbach Method and device for producing casting molds from molding sand containing binding agents
JPS6047031B2 (en) * 1977-09-21 1985-10-19 新東工業株式会社 mold making machine
JPS5914032Y2 (en) * 1979-05-28 1984-04-25 株式会社豊田自動織機製作所 Mold making equipment

Also Published As

Publication number Publication date
EP0115848A3 (en) 1988-01-13
US4593740A (en) 1986-06-10
DE3304148C1 (en) 1984-02-09
JPS59153547A (en) 1984-09-01
EP0115848A2 (en) 1984-08-15
DE3482170D1 (en) 1990-06-13
JPS6338262B2 (en) 1988-07-29

Similar Documents

Publication Publication Date Title
EP0115848B1 (en) Method and equipment for separating a pattern from a mould
DE2844464C2 (en) Method and device for compacting casting molds
DE2653788C2 (en) Method and device for producing casting molds from molding sand containing binding agents
DE3507179C1 (en) Method and device for producing boxless molds
DE3511283A1 (en) METHOD AND DEVICE FOR COMPRESSING FOUNDRY MOLDING MATERIALS
DE4092542C2 (en) Process for producing a series of casting molds or molded parts and device for carrying out the process
DE1300205B (en) Method of moving sand molds
DE3341959C1 (en) Device for producing moldings from dry, free-flowing molding compound, in particular ceramic molding compound. Keyword: Combined filling, pressing and removal tool
DD146258A5 (en) METHOD AND DEVICE FOR MANUFACTURING SANDGED FORMS
EP0036434A1 (en) Method and device for compacting casting moulds
DE3206169C1 (en) Molding machine for the production of boxless molds
EP0650788A1 (en) Apparatus for compacting powdery materials
DE60005065T2 (en) METHOD AND DEVICE FOR PRODUCING CHILLERS OR CHILLER PARTS
DE1941736B1 (en) Procedure in boxless molding machines for pouring in the molding sand and machine for carrying out the same
DE4319078C2 (en) Process and mold making machine for the production of molds or mold parts from molding sand
DE3339620C1 (en) Molding line
DE2430403B2 (en) Method and device for the production of casting molds
CH662522A5 (en) MOLDING MACHINE FOR PRODUCING GAS-HARDENED SAND MOLDS AND METHOD FOR OPERATING THIS MOLDING MACHINE.
DE2933869A1 (en) METHOD AND DEVICE FOR CASTING A SUB-BOX MOLD
DE3914160C1 (en)
DE2436657B2 (en) DEVICE FOR THE PRODUCTION OF VACUUM CASTING FORMS
DE2653648C3 (en) Mold model for a vacuum molding device and method for vacuum molding a casting mold
DE3916530C2 (en) Process for the production of casting molds by pulse compression
DE2528646A1 (en) DEVICE FOR THE AUTOMATIC MANUFACTURING OF BOXLESS CASTING FORMS
DE4023180C1 (en) Press forming machine - has venting opening in hood enclosing pressure plate, filling frame and moulded, to prevent air ingress

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19880224

17Q First examination report despatched

Effective date: 19880810

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE FR GB IT LI NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900509

Ref country code: NL

Effective date: 19900509

Ref country code: GB

Effective date: 19900509

Ref country code: FR

Effective date: 19900509

Ref country code: BE

Effective date: 19900509

REF Corresponds to:

Ref document number: 3482170

Country of ref document: DE

Date of ref document: 19900613

ITF It: translation for a ep patent filed

Owner name: DR. ING. AUSSERER ANTON

EN Fr: translation not filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]
ITTA It: last paid annual fee
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19990114

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19991227

Year of fee payment: 17

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000229

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000229

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011201