EP1444063B1 - Method and mould shooter for producing mould parts, such as casting cores, for casting moulds used to cast metal melts - Google Patents
Method and mould shooter for producing mould parts, such as casting cores, for casting moulds used to cast metal melts Download PDFInfo
- Publication number
- EP1444063B1 EP1444063B1 EP02777041A EP02777041A EP1444063B1 EP 1444063 B1 EP1444063 B1 EP 1444063B1 EP 02777041 A EP02777041 A EP 02777041A EP 02777041 A EP02777041 A EP 02777041A EP 1444063 B1 EP1444063 B1 EP 1444063B1
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- EP
- European Patent Office
- Prior art keywords
- mould
- filling elements
- casting
- mould tool
- filling
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- 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
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C19/00—Components or accessories for moulding machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
- B22C15/245—Blowing tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
- B22C9/123—Gas-hardening
Definitions
- the invention relates to a method and a molding shooting machine for producing molded parts, such as casting cores, for casting molds for casting molten metal.
- a molding material which is usually bound to synthetic resin is filled into the cavity of a molding tool which determines the final shape of the casting core molding to be produced.
- the mold has a sufficient for a uniform filling of the cavity number of weft openings, via which the filling is done with molding material.
- a "weft nozzle” is introduced, via which then the molding material is injected.
- the firing nozzles are usually carried together by a height-adjustable "shooting head plate", which ensures a retraction and extension of the core box in the firing position.
- the supply of the guns takes place in the known devices usually via a so-called “shooting hood", which covers the shooting head plate on its side facing away from the mold side and with molding material is filled.
- a gas usually air, uniformly pressurized via a shooting cylinder, so that it is driven via the firing nozzles in the mold.
- the curing can be initiated by the use of suitable binders by supplying heat.
- suitable binders by supplying heat.
- suitable form-shooting machines are equipped for producing mold cores with heaters for heating the mold.
- the curing of the molding material is effected in this case by the heat supply in the mold.
- a molding material is prepared by mixing an inorganic refractory molding sand with a water glass based inorganic binder. This molding material is then filled in a tempered, exposed to a vacuum mold during filling. The temperature / residence time of the molding material after closing the mold is adjusted so that forms a dimensionally stable and viable edge shell on the core molding. If the core molding has reached this state, the mold is opened and the core molding is removed. Immediately thereafter, the core molding is subjected to complete drying under the action of microwaves. The molding material formed by the mixture filled in the mold is thus removed by physical means moisture. As a result, through this dehumidifying process still in the mold a solidification of the core molding is achieved, which allows at least its handling in the further processing steps.
- a method and an apparatus for producing cores from a molding material which is mixed from a molding sand and a curable, synthetic resin.
- This molding material is filled from a firing pot via filling nozzles into a core box which depicts the core to be produced.
- the filling device is moved to a standstill position.
- the nozzles are immersed in a foam provided in a special box, which is impregnated with a silicone-based emulsion. In this way, a bonding of the molding material in the nozzle itself can indeed be prevented.
- the danger remains that it comes to the curing of molding material in the gunner.
- the resulting mold lumps can also clog the guns.
- the object of the invention is to provide a method and a device with which moldings for casting molds can be produced reliably and with reduced susceptibility to failure from a molding material containing an inorganic binder.
- the mold is additionally reciprocable between a filling and a removal station.
- the components which are heated by the heat radiated by the mold to a temperature at which the unwanted premature and, as a result, disturbing curing of the molding material could be used are deliberately kept moist.
- the components which are particularly affected by the heating are typically the shooting nozzles or the shooting hood required for supplying the shooting nozzles with the shooting plate or other molding material-carrying supply channels connected to them.
- the moistening of the heat released by the heat emitted by the mold and consequently endangered with respect to the solidification of molding material components according to the invention is characterized in that at least one of the filling is at least temporarily exposed to a humid atmosphere during the curing time.
- This embodiment of the invention is particularly suitable for avoiding the hardening of molding material in the firing hood, if in the hood targeted a humid atmosphere is maintained.
- the moisture content of preferably by air As a carrier gas atmosphere formed can be easily adapted to the particular circumstances.
- Another embodiment of the invention which is particularly easy to implement and nevertheless effective, is characterized in that at least one of the co-heated filling elements is brought into contact with a moisture carrier at least temporarily during the curing time.
- This moisture carrier may be an absorbent material impregnated with liquid, in particular water, such as a sponge or a cloth. Practical experiments have shown that, when such a moisture carrier is docked to the waiting in the weft nozzles, the solidification of mold material contained in the nozzles can be safely avoided.
- a hot gas preferably heated air
- a hot gas stream is passed through the mold during the time required for the molding to harden in addition to the heat introduced via the tool itself. That way on the one hand, the gases produced in the course of curing removed from the mold.
- additional heat is introduced into the molded part. In this case, this heat does not penetrate slowly over the peripheral shell of the molded part in its interior, but is actively transported by the gas flow in the interior of the core of the molding.
- Moldings obtained in compliance with this variant of the procedure according to the invention therefore have a particularly high, homogeneously distributed strength even when they are removed from the mold. At the same time can be achieved in this way, for example, in the production of casting cores cycle times that are not higher than the times required for the production of corresponding cores from organic binders, in particular synthetic resins containing molding materials.
- the form-casting machine 1 for producing casting cores K according to the "hot-box method” has a mixer 3.
- a molding material F is mixed from an inorganic refractory molding sand and a water glass-based binder.
- This molding material F is placed in a hopper 4 arranged below the mixer 3, from which it is passed into a shooting cylinder 5 positioned below the filling hopper 4.
- the shooting cylinder 5 shoots the filler F in a connected to him, starting from the shooting cylinder 5 in its width and depth widening down shooting hood 6, which is closed at its bottom by a shooting head plate 7.
- the weft nozzles 8 extending in the direction of the upper box 9 of a forming tool 10 are arranged corresponding to the weft holes 11 formed in the upper box 9.
- the weft holes 11 open into a cavity 12 which is formed by corresponding, molded into the upper box 9 and the lower box 13 of the mold 10 recesses.
- Other elements not shown here may be part of the molding machine 1.
- vent openings 14 are formed, on the escape of the filled mold material F escapes during filling of the cavity 12. If necessary corresponding, not shown vents introduced into the upper box.
- a heater 15 By means of a heater 15, the upper box 9 and the lower box 13 of the mold 10 can be controlled heated.
- adjusting means are provided to drive the core box with the shot holes 11 to the firing nozzles 8 in a firing position in which they sit in the shot holes 11 of the mold 10. With the firing nozzles 8, the firing head plate 7, the firing cap 6, the firing cylinder 5 and the funnel 4 firmly connected to them are brought together ( Fig. 1 ).
- the molding machine 1 After the injection of the molding material F into the mold 10, the molding machine 1 is moved into the waiting position, in which the tips of the nozzles 9 are arranged at a distance above the mold 10 ( Fig. 2 ).
- This waiting position keep the shot nozzles 8 until the molding material F contained in the cavity 12 of the molding tool 10 has hardened to the casting core K due to the dehumidification that occurs as a result of the heating of the molding material F in the molding tool 10. If no air flow L is passed through the forming tool 10 through overpressure or underpressure to improve the hardening process, then the gases produced in the course of hardening escape automatically via the shot holes 11 and the vent openings 14 out of the molding tool 10.
- a humidifying device 16 is connected, can be passed through the humid air into the interior of the firing hood 6.
- Sponge 17 is mounted on a plate 18 which can be driven with the weft nozzles 8 in the waiting under the firing nozzles 8 and raised so that the sponge 17 presses against the firing nozzles 8 and at least completely surrounds their lower, the nozzle opening portion.
- the nozzles 8 are each associated with a nozzle 19 via which moist air supplied by the moistening device 16 when the firing nozzles 8 are in the waiting position is blown onto the firing nozzles 8.
- the moisture content of the introduced in the waiting position in the firing hood 6 and blown against the firing nozzles 8 moist air is adjusted so that there is no dehydration of the molding material. In this way, it is reliably prevented that the molding sand F still contained in the firing hood 6 and the firing nozzles 8 solidifies as a result of the heating and the dehydration, which causes the respective components due to the radiant heat W emitted by the hot mold 10 during both Filling process ( Fig. 1 ) as well as in the longer waiting position ( Fig. 2 ) are exposed.
- a device 20 which has an air supply connection 21 and suction connection 22.
- the air supply connection 21 of the device 20 with the shot holes 11 and the suction connection 22 of the device 20 with ventilation openings 14 of the molding tool 10 are coupled (FIG. Fig. 2 ).
- a hot, dry air stream L is continuously fed into the mold 10 via the air supply connection 21.
- This air stream L flows through the casting core K contained in the mold 10, which is hardened, and is drawn off via the vent openings 14 of the molding tool 10. In this way, the core interior is heated evenly, so that the moisture contained in the core K escapes faster overall.
- the air stream L extracted via the suction connection 22 transports the gases produced during the heating of the casting core K in a targeted and rapid manner out of the mold 10.
- the more homogeneous heat distribution in the casting core K achieved by the air flow L thus results in a shortened curing time with simultaneously improved strength of the casting core K.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Devices For Molds (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze.The invention relates to a method and a molding shooting machine for producing molded parts, such as casting cores, for casting molds for casting molten metal.
Bei der konventionellen Herstellung von für das Vergießen von Leichtmetall-Schmelzen bestimmten Gießkernen wird ein in der Regel kunstharzgebundener Formstoff in den die Endform des zu erzeugenden Gießkern-Formteils bestimmenden Hohlraum eines Formwerkzeugs gefüllt. Das Formwerkzeug weist dabei eine für eine gleichmäßige Befüllung des Hohlraums ausreichende Anzahl von Schußöffnungen auf, über welche die Befüllung mit Formstoff erfolgt. In jede dieser Schußöffnungen wird zum Befüllen des Formwerkzeugs jeweils eine "Schußdüse" eingeführt, über die dann der Formstoff eingeschossen wird. Die Schußdüsen werden in der Regel gemeinsam von einer höhenverstellbaren "Schußkopfplatte" getragen, die ein Ein- und Ausfahren des Kernkastens in die Schießpositionsicherstellt.In the conventional production of casting cores intended for the casting of light metal melts, a molding material which is usually bound to synthetic resin is filled into the cavity of a molding tool which determines the final shape of the casting core molding to be produced. The mold has a sufficient for a uniform filling of the cavity number of weft openings, via which the filling is done with molding material. In each of these weft openings for filling of the mold in each case a "weft nozzle" is introduced, via which then the molding material is injected. The firing nozzles are usually carried together by a height-adjustable "shooting head plate", which ensures a retraction and extension of the core box in the firing position.
Die Versorgung der Schußdüsen erfolgt bei den bekannten Vorrichtungen üblicherweise über eine sogenannte "Schußhaube", welche die Schußkopfplatte auf ihrer vom Formwerkzeug abgewandten Seite abdeckt und mit Formstoff gefüllt ist. Zum Einschießen des Formsands wird der in der Schußhaube enthaltene Formstoff schlagartig mit einem Gas, in der Regel Luft, über einen Schießzylinder gleichmäßig druckbeaufschlagt, so daß er über die Schußdüsen in das Formwerkzeug getrieben wird.The supply of the guns takes place in the known devices usually via a so-called "shooting hood", which covers the shooting head plate on its side facing away from the mold side and with molding material is filled. To inject the molding sand of the molding material contained in the shooting hood abruptly with a gas, usually air, uniformly pressurized via a shooting cylinder, so that it is driven via the firing nozzles in the mold.
Um die erforderliche Endfestigkeit des zu erzeugenden Formteils herzustellen, besteht einerseits die Möglichkeit, durch Zugabe geeigneter Mittel eine chemische Reaktion katalytisch in dem Formstoff hervorzurufen. Bei diesem sogenannten "Cold-Box-Verfahren" wird ein infolge der chemischen Reaktion ausgehärtetes Formteil erhalten. Dieses kann allerdings so nicht mehr in den Kreislauf für die Formteilherstellung verwendeten Werkstoffe zurückgeführt werden.In order to produce the required final strength of the molded part to be produced, on the one hand it is possible, by adding suitable means, to cause a chemical reaction catalytically in the molding material. In this so-called "cold-box process" a cured as a result of the chemical reaction molding is obtained. However, this can no longer be recycled in the cycle used for the molding of materials.
Alternativ kann die Aushärtung bei Verwendung geeigneter Binder durch Wärmezufuhr eingeleitet werden. Zur Durchführung dieses sogenannten "Hot-Box-Verfahrens" sind bekannte Formschießmaschinen zum Herstellen von Formkernen mit Heizungen zum Erwärmen des Formwerkzeugs ausgestattet. Die Aushärtung des Formstoffs wird in diesem Fall durch die Wärmezufuhr im Formwerkzeug bewirkt.Alternatively, the curing can be initiated by the use of suitable binders by supplying heat. To carry out this so-called "hot-box process" known form-shooting machines are equipped for producing mold cores with heaters for heating the mold. The curing of the molding material is effected in this case by the heat supply in the mold.
Da die Verwendung von organischen Bindern zu Arbeitsplatz- und Umweltbelastungen führen kann, ist man bestrebt, die bisher für die Herstellung von Gießkernen verwendeten, organische Binder enthaltenden Formstoffe durch solche Formstoffe zu ersetzen, die durch anorganische Binder, wie z.B. wasserglasbasierte Binder, gebunden werden. Ein Verfahren, welches die Verwendung derart zusammengesetzter Formstoffe zur Herstellung von Kernformlingen ermöglicht, ist aus der
Gemäß diesem bekannten Verfahren wird zunächst ein Formstoff durch Mischen eines anorganischen, feuerfesten Formsands mit einem anorganischen Bindemittel auf Wasserglasbasis hergestellt. Dieser Formstoff wird dann in ein temperiertes, während der Befüllung einem Unterdruck ausgesetztes Formwerkzeug gefüllt. Die Temperatur / Verweilzeit des Formstoffs nach dem Schließen des Formwerkzeugs wird dabei so eingestellt, daß sich an dem Kernformling eine formstabile und tragfähige Randschale ausbildet. Hat der Kernformling diesen Zustand erreicht, so wird das Formwerkzeug geöffnet und der Kernformling entnommen. Unmittelbar anschließend wird der Kernformling unter Einwirkung von Mikrowellen einer vollständigen Trocknung unterzogen. Dem durch die in das Formwerkzeug eingefüllte Mischung gebildeten Formstoff wird so auf physikalischem Wege Feuchtigkeit entzogen. Im Ergebnis wird durch diesen Entfeuchtungsvorgang noch im Formwerkzeug eine Verfestigung des Kernformlings erreicht, die mindestens sein Handling in den weiteren Bearbeitungsschritten ermöglicht.According to this known method, first, a molding material is prepared by mixing an inorganic refractory molding sand with a water glass based inorganic binder. This molding material is then filled in a tempered, exposed to a vacuum mold during filling. The temperature / residence time of the molding material after closing the mold is adjusted so that forms a dimensionally stable and viable edge shell on the core molding. If the core molding has reached this state, the mold is opened and the core molding is removed. Immediately thereafter, the core molding is subjected to complete drying under the action of microwaves. The molding material formed by the mixture filled in the mold is thus removed by physical means moisture. As a result, through this dehumidifying process still in the mold a solidification of the core molding is achieved, which allows at least its handling in the further processing steps.
In der Praxis zeigen sich bei der Durchführung des bekannten Verfahrens in herkömmlichen, mit einer Einrichtung für die Erwärmung des Formwerkzeugs ausgestatteten Vorrichtungen verschiedene Mängel. Diese äußern sich beispielsweise in einem unerwünschten vorzeitigen Aushärten der Formstoffe in den Bauteilen der Formschießmaschine, die von der vom Formwerkzeug abgestrahlten Wärme erfaßt werden. Bei diesen Bauteilen handelt es sich insbesondere um die Schußdüsen und die Schußhaube, die auch in Wartestellung auf eine für den Beginn des Aushärtens des Formstoffes aufgrund von Dehydration kritische Temperatur erwärmt werden. Das vorzeitige Aushärten des Formstoffes führt beispielsweise in der Schußhaube zur Krustenbildung an der Formstoffoberfläche, so daß sich der Formstoff nicht mehr ordnungsgemäß in das Formwerkzeug einbringen läßt. Unvollständige Füllungen des Formwerkzeugs und Verstopfungen der Schußdüsen sind die Folge. Auch in den Schußdüsen selbst aushärtender Formstoff führt zum Verstopfen der Düsen, so daß ebenfalls eine gleichmäßige, ordnungsgemäße Befüllung nicht mehr gewährleistet ist.In practice, in carrying out the known method in conventional, equipped with a device for heating the mold various defects. These manifest themselves, for example, in an undesired premature curing of the molding materials in the components of the form-shooting machine, that of the mold radiated heat to be detected. These components are, in particular, the weft nozzles and the weft hood which, even when waiting, are heated to a critical temperature for the start of curing of the molding material due to dehydration. The premature curing of the molding material leads, for example, in the firing hood to encrustation on the molding surface, so that the molding material can no longer properly bring into the mold. Incomplete fillings of the mold and blockages of the guns are the result. Even in the guns self-curing molding material leads to clogging of the nozzle, so that a uniform, proper filling is no longer guaranteed.
Neben dem voranstehend erläuterten Stand der Technik sind aus der
Die Aufgabe der Erfindung besteht darin, ein Verfahren und eine Vorrichtung anzugeben, mit denen sich aus einem einen anorganischen Binder enthaltenden Formstoff Formteile für Gießformen zuverlässig und mit verminderter Störungsanfälligkeit herstellen lassen.The object of the invention is to provide a method and a device with which moldings for casting molds can be produced reliably and with reduced susceptibility to failure from a molding material containing an inorganic binder.
Ausgehend von dem voranstehend erläuterten Stand der Technik wird diese Aufgabe im Hinblick auf das Verfahren erfindungsgemäß durch die Lehre des unabhängigen Verfahrensanspruchs 1 gelöst.Based on the above-described prior art, this object is achieved with regard to the method according to the invention by the teaching of independent method claim 1.
Zum anderen wird die voranstehend genannte Aufgabe in Bezug auf eine Vorrichtung erfindungsgemäß durch die Lehre des unabhängigen Vorrichtungsanspruchs gelöst.On the other hand, the object mentioned above with respect to a device is achieved according to the invention by the teaching of the independent device claim.
Vorzugsweise ist dabei das Formwerkzeug zusätzlich zwischen einer Befüll- und einer Entnahmestation hin- und herbewegbar.Preferably, the mold is additionally reciprocable between a filling and a removal station.
Besonders geeignet sind ein erfindungsgemäßes Verfahren und eine erfindungsgemäße Formschießmaschine zur Herstellung von Gießkernen für das Vergießen von Leichtmetall-Schmelzen, die in der Praxis den weitaus größten Teil der in Vorrichtungen der hier in Rede stehenden Art hergestellten Gießformteile darstellen.Particularly suitable are a method according to the invention and a shape shooting machine according to the invention for the production of casting cores for the casting of light metal melts, which represent in practice by far the largest part of the casting moldings produced in devices of the type in question.
Gemäß der Erfindung werden während des Aushärtens des in das erwärmte Formwerkzeug gefüllten Formstoffs diejenigen Bauteile gezielt feucht gehalten, die von der vom Formwerkzeug abgestrahlten Wärme auf eine Temperatur erwärmt werden, bei der das ungewollte vorzeitige und infolgedessen störende Aushärten des Formstoffs einsetzen könnte. Auf diese Weise wird dem in oder an diesen Bauteilen infolge der Erwärmung andernfalls eintretende Wasserentzug aus dem Formstoff entgegengewirkt und so die Verfestigung von Formstoff in den kritischen Bauteilen der Schießmaschine verhindert. Bei den von der Erwärmung besonders betroffenen Bauteilen handelt es sich dabei typischerweise um die Schußdüsen oder die zur Versorgung der Schußdüsen benötigte Schußhaube mit der an sie angeschlossenen Schußplatte oder andere Formstoff führende Versorgungskanäle.According to the invention, during curing of the molding material filled in the heated mold, those components which are heated by the heat radiated by the mold to a temperature at which the unwanted premature and, as a result, disturbing curing of the molding material could be used, are deliberately kept moist. In this way, the in or on these components due to the heating otherwise entering Dehydration counteracted from the molding material and thus prevents the solidification of molding material in the critical components of the shooting machine. The components which are particularly affected by the heating are typically the shooting nozzles or the shooting hood required for supplying the shooting nozzles with the shooting plate or other molding material-carrying supply channels connected to them.
Indem diese Bauteile während der für das Aushärten des Formteils im Formwerkzeug benötigten Verweilzeit gezielt befeuchtet werden, wird beispielsweise sowohl eine Krustenbildung in der Schußhaube als auch das Verkleben der Schußdüsen durch sich verfestigenden Formstoff verhindert. Auf diese Weise lassen sich auch anorganische, wasserbasierte Binder enthaltende Formstoffe sicher zu Formteilen für den Gießereibetrieb nutzen. Die erhaltenen Formteile zeichnen sich durch eine gute Festigkeit aus und lassen sich nach ihrem Gebrauch wieder in den Kreislauf der für die Formteilherstellung eingesetzten Werkstoffe zurückführen.By these components are specifically moistened during the residence time required for the curing of the molding in the mold, for example, both a crust formation in the weft hood and the bonding of the weft nozzles is prevented by solidifying molding material. In this way, inorganic, water-based binder-containing molding materials can be safely used to moldings for the foundry. The resulting moldings are characterized by good strength and can be returned to their use in the cycle of materials used for the molding of parts.
Die Befeuchtung der durch die vom Formwerkzeug abgegebenen Wärme erwärmten und infolgedessen hinsichtlich des Verfestigens von Formstoff gefährdeten Bauteile erfolgt gemäß der Erfindung dadurch, daß mindestens eines der Befüllelemente während der Aushärtezeit mindestens zeitweise einer feuchten Atmosphäre ausgesetzt wird. Diese Ausgestaltung der Erfindung eignet sich insbesondere zur Vermeidung des Aushärtens von Formstoff in der Schußhaube, wenn in der Haube gezielt eine feuchte Atmosphäre aufrechterhalten wird. Der Feuchtigkeitsgehalt der vorzugsweise durch Luft als Trägergas gebildeten Atmosphäre kann dabei problemlos den jeweiligen Gegebenheiten angepaßt werden. So ist es beispielsweise denkbar, die Feuchtigkeit der die in Wartestellung befindlichen Schießdüsen umgebenden Atmosphäre so einzustellen, daß sich an den Schußdüsen Kondensat bildet und infolgedessen die Verfestigung von in den Schußdüsen enthaltenem oder an ihnen haftendem Formstoff sicher vermieden wird.The moistening of the heat released by the heat emitted by the mold and consequently endangered with respect to the solidification of molding material components according to the invention is characterized in that at least one of the filling is at least temporarily exposed to a humid atmosphere during the curing time. This embodiment of the invention is particularly suitable for avoiding the hardening of molding material in the firing hood, if in the hood targeted a humid atmosphere is maintained. The moisture content of preferably by air As a carrier gas atmosphere formed can be easily adapted to the particular circumstances. Thus, for example, it is conceivable to adjust the humidity of the atmosphere surrounding the waiting nozzles in order to form condensate at the gun nozzles and, as a result, the solidification of mold material contained in the gun nozzles or adhering to them is reliably avoided.
Ergänzend zu einer Befeuchtung durch Aufrechterhaltung einer Atmosphäre von bestimmter Feuchtigkeit kann es vorteilhaft sein, mindestens eines der miterwärmten Befüllelemente während der Aushärtezeit mindestens zeitweise zu kühlen. Auch durch eine solche gezielte Kühlung kann die Bildung von Kondensat herbeigeführt werden. Diese Ausgestaltung der Erfindung ist daher besonders zum Schutz der Schußdüsen vor der Verstopfung durch verfestigten Formstoff geeignet. Zusätzlich oder alternativ kann die Schußluft selbst befeuchtet werden, um einem Austrocknen oder Aushärten des Formstoffs von vornherein vorzubeugen.In addition to a moistening by maintaining an atmosphere of certain moisture, it may be advantageous to at least temporarily cool at least one of the co-heated filling elements during the curing time. Also by such targeted cooling can be brought about the formation of condensate. This embodiment of the invention is therefore particularly suitable for protecting the shot nozzles from clogging by solidified molding material. Additionally or alternatively, the firing air itself can be moistened to prevent drying or curing of the molding material from the outset.
Eine weitere, besonders einfach zu verwirklichende und dennoch wirkungsvolle Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß mindestens eines der miterwärmten Befüllelemente während der Aushärtezeit mindestens zeitweise mit einem Feuchtigkeitsträger in Kontakt gebracht wird. Bei diesem Feuchtigkeitsträger kann es sich um ein mit Flüssigkeit, insbesondere Wasser, getränktes saugfähiges Material, wie einen Schwamm oder einen Lappen handeln. Praktische Versuche haben ergeben, daß sich, wenn ein solcher Feuchtigkeitsträger an die in Wartestellung befindlichen Schußdüsen angedockt wird, die Verfestigung von in den Düsen enthaltenem Formstoff sicher vermeiden läßt.Another embodiment of the invention, which is particularly easy to implement and nevertheless effective, is characterized in that at least one of the co-heated filling elements is brought into contact with a moisture carrier at least temporarily during the curing time. This moisture carrier may be an absorbent material impregnated with liquid, in particular water, such as a sponge or a cloth. Practical experiments have shown that, when such a moisture carrier is docked to the waiting in the weft nozzles, the solidification of mold material contained in the nozzles can be safely avoided.
Indem der Hohlraum des Formwerkzeugs im Verlauf der Aushärtezeit mindestens zeitweise von einem heißen Gas, vorzugsweise erwärmter Luft, durchströmt wird, das trocken zugeführt und mit Feuchtigkeit beladen abgezogen wird, läßt sich der Verlauf des Aushärtens des im Formwerkzeug enthaltenen Formteils gezielt verbessern. Nach dem Befüllen des Formwerkzeugs mit Formstoff wird in diesem Fall während der für das Aushärten des Formlings benötigten Zeit zusätzlich zu der über das Werkzeug selbst eingebrachten Wärme ein heißer, trockener Gasstrom durch die Form geleitet. Auf diese Weise werden einerseits die im Zuge des Aushärtens entstehenden Gase aus dem Formwerkzeug abgeführt. Andererseits wird zusätzliche Wärme in das Formteil eingebracht. Dabei dringt diese Wärme nicht langsam über die Randschale des Formteils in dessen Inneres vor, sondern wird aktiv von dem Gasstrom in das Kerninnere des Formteils transportiert.By the cavity of the mold in the course of curing at least temporarily by a hot gas, preferably heated air, flows, which is supplied dry and withdrawn loaded with moisture, the course of curing of the molding contained in the mold can be specifically improved. In this case, after the mold has been filled with molding material, a hot, dry gas stream is passed through the mold during the time required for the molding to harden in addition to the heat introduced via the tool itself. That way on the one hand, the gases produced in the course of curing removed from the mold. On the other hand, additional heat is introduced into the molded part. In this case, this heat does not penetrate slowly over the peripheral shell of the molded part in its interior, but is actively transported by the gas flow in the interior of the core of the molding.
Im Ergebnis wird so eine schnelle und gleichmäßige Kernaushärtung erreicht. Der Einfluß auch stark schwankender Dickenverläufe des Kerns wird so minimiert. Bei Einhaltung dieser Variante der erfindungsgemäßen Vorgehensweise erhaltene Formteile besitzen daher bereits bei Entnahme aus dem Formwerkzeug eine besonders hohe, homogen verteilte Festigkeit. Gleichzeitig lassen sich auf diese Weise beispielsweise bei der Herstellung von Gießkernen Zykluszeiten erzielen, die nicht höher als die Zeiten sind, die für die Herstellung von entsprechenden Gießkernen aus organischen Bindern, insbesondere Kunstharzen, enthaltenden Formstoffen benötigt werden.As a result, a fast and uniform core hardening is achieved. The influence of strongly fluctuating thickness gradients of the core is thus minimized. Moldings obtained in compliance with this variant of the procedure according to the invention therefore have a particularly high, homogeneously distributed strength even when they are removed from the mold. At the same time can be achieved in this way, for example, in the production of casting cores cycle times that are not higher than the times required for the production of corresponding cores from organic binders, in particular synthetic resins containing molding materials.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen angegeben und werden im Zusammenhang mit dem nachfolgend anhand einer Zeichnung beschriebenen Ausführungsbeispiel näher erläutert. Es zeigen schematisch in einer teilweise geschnittenen Darstellung:
- Fig. 1
- eine Formschießmaschine zum Herstellen von Gießkernen in einer ersten Betriebsstellung;
- Fig. 2
- die in
Fig. 1 dargestellte Formschießmaschine in einer zweiten Betriebsstellung.
- Fig. 1
- a form-shooting machine for producing casting cores in a first operating position;
- Fig. 2
- in the
Fig. 1 Shaping machine shown in a second operating position.
Die Formschießmaschine 1 zum Herstellen von Gießkernen K nach dem "Hot-Box-Verfahren" weist einen Mischer 3 auf. In dem Mischer 3 wird aus einem anorganischen, feuerfesten Formsand und einem wasserglasbasiertem Binder ein Formstoff F gemischt.The form-casting machine 1 for producing casting cores K according to the "hot-box method" has a
Dieser Formstoff F wird in einen unterhalb des Mischers 3 angeordneten Fülltrichter 4 gegeben, von dem er in einen unterhalb des Fülltrichters 4 positionierten Schießzylinder 5 geleitet wird. Der Schießzylinder 5 schießt den Füllstoff F in eine an ihn angeschlossene, sich ausgehend von dem Schießzylinder 5 in ihrer Breite und Tiefe nach unten erweiternde Schußhaube 6, die an ihrer Unterseite durch eine Schußkopfplatte 7 verschlossen ist. In der Schußkopfplatte 7 sind eine Vielzahl von weiter nicht dargestellten Aufnahmen eingeformt, in denen jeweils eine Schußdüse 8 sitzt.This molding material F is placed in a
Die sich in Richtung des Oberkastens 9 eines Formwerkzeugs 10 erstreckenden Schußdüsen 8 sind entsprechend den in den Oberkasten 9 eingeformten Schußlöchern 11 angeordnet. Die Schußlöcher 11 münden in einem Hohlraum 12, der durch entsprechende, in den Oberkasten 9 und den Unterkasten 13 des Formwerkzeugs 10 eingeformte Ausnehmungen gebildet ist. Weitere hier nicht dargestellte Elemente können Bestandteil der Formmaschine 1 sein.The
Durch den Hohlraum 12 ist die Form des zu erzeugenden Gießkerns K bestimmt In den Unterkasten 13 sind Entlüftungsöffnungen 14 eingeformt, über die beim Befüllen des Hohlraums 12 die vom eingefüllten Formstoff F verdrängte Luft entweicht. Bei Bedarf sind entsprechende, hier nicht dargestellte Entlüftungsöffnungen in den Oberkasten eingebracht. Mittels einer Heizeinrichtung 15 können der Oberkasten 9 und der Unterkasten 13 des Formwerkzeugs 10 kontrolliert beheizt werden.Through the
Nicht dargestellte Stelleinrichtungen sind vorgesehen, um den Kernkasten mit den Schußlöchern 11 an die Schußdüsen 8 in eine Schußstellung zu fahren, in der sie in den Schußlöchern 11 des Formwerkzeugs 10 sitzen. Mit den Schußdüsen 8 werden dabei die mit ihnen fest verbundene Schußkopfplatte 7, die Schußhaube 6, der Schußzylinder 5 und der Trichter 4 zusammengeführt (
Nach erfolgtem Einschießen des Formstoffs F in das Formwerkzeug 10 wird die Formmaschine 1 in die Wartestellung bewegt, in denen die Spitzen der Schußdüsen 9 mit Abstand oberhalb des Formwerkzeugs 10 angeordnet sind (
An die Schußhaube 6 ist eine Befeuchtungseinrichtung 16 angeschlossen, über die feuchte Luft in den Innenraum der Schußhaube 6 geleitet werden kann. Darüber hinaus ist ein Schwamm 17 auf einer Platte 18 befestigt, die bei in Wartestellung befindlichen Schußdüsen 8 unter die Schußdüsen 8 gefahren und so angehoben werden kann, daß der Schwamm 17 gegen die Schußdüsen 8 drückt und mindestens ihren unteren, die Düsenöffnung aufweisenden Abschnitt vollständig umgibt. Zusätzlich ist den Schußdüsen 8 jeweils eine Düse 19 zugeordnet, über die bei in Wartestellung befindlichen Schußdüsen 8 von der Befeuchtungseinrichtung 16 gelieferte feuchte Luft auf die Schußdüsen 8 geblasen wird.To the firing hood 6 a
Der Feuchtegehalt der in der Wartestellung in die Schußhaube 6 eingeleiteten und gegen die Schußdüsen 8 geblasenen feuchten Luft ist so abgestimmt, daß es zu keiner Dehydration des Formstoffs kommt. Auf diese Weise wird sicher verhindert, daß sich der in der Schußhaube 6 und den Schußdüsen 8 in der Wartestellung noch enthaltene Formsand F infolge der Erwärmung und des Wasserentzuges verfestigt, der die betreffenden Bauteile aufgrund der von dem warmen Formwerkzeug 10 abgegebenen Strahlungswärme W sowohl während des Befüllvorgangs (
Durch den in Wartestellung gegen die Schußdüsen 8 gedrückten Schwamm 17 ist dabei zusätzlich gezielt sichergestellt, daß es zu keiner Verstopfung der Düsenöffnungen der Schußdüsen 8 infolge von verklebendem Formstoff F kommt. Ergänzend unterstützt werden kann die Kondensatbildung im Bereich der Schußdüsen 8 dadurch, daß die Schußdüsen 8 mit Hilfe einer hier nicht gezeigten Kühleinrichtung in der Wartestellung gekühlt werden. Diese Kühlung verhindert zudem wirksam, daß die Temperatur im Innenraum der Schußdüsen 8 auf ein für die Verfestigung des Formstoffs F kritisches Niveau steigt. Durch die Befeuchtung der Außenseite der Schußdüsen 8 ist gewährleistet, daß es nicht zum Anbacken von verfestigtem Formsand F auf den Schußdüsen 8 kommt.By the pressed in the waiting position against the
Um einen verbesserten Verlauf der Aushärtung des Gießkerns K im Formwerkzeug 10 zu erreichen, ist eine Einrichtung 20 vorgesehen, die einen Luftzufuhranschluß 21 und Absauganschluß 22 aufweist. Während der für die Aushärtung des Gießkerns K benötigten Aushärtezeit sind bei in Wartestellung befindlichen Schußdüsen 8 der Luftzufuhranschluß 21 der Einrichtung 20 mit den Schußlöchern 11 und der Absauganschluß 22 der Einrichtung 20 mit Entlüftungsöffnungen 14 des Formwerkzeugs 10 verkoppelt (
Gleichzeitig transportiert der über den Absauganschluß 22 abgesaugte Luftstrom L die im Zuge der Erwärmung des Gießkern K entstehenden Gase gezielt und schnell aus dem Formwerkzeug 10 heraus. Die durch den Luftstrom L erreichte homogenere Wärmeverteilung im Gießkern K bewirkt so eine verkürzte Aushärtezeit bei gleichzeitig verbesserter Festigkeit des erhaltenen Gießkerns K.At the same time, the air stream L extracted via the
- 11
- Formschießmaschine zum Herstellen von GießkernenShaping machine for producing casting cores
- 33
- Mischermixer
- 44
- Fülltrichterhopper
- 55
- Schießzylindershooting cylinder
- 66
- Schußhaubeshot hood
- 77
- SchußkopfplatteShooting head plate
- 88th
- Schußdüsepicking nozzle
- 99
- Oberkastentop box
- 1010
- Formwerkzeugmold
- 1111
- Schußlöchershot holes
- 1212
- Hohlraumcavity
- 1313
- Unterkastenlower box
- 1414
- Entlüftungsöffnungenvents
- 1515
- Heizeinrichtungheater
- 1616
- Befeuchtungseinrichtunghumidifying
- 1717
- Schwammsponge
- 1818
- Platteplate
- 1919
- Düsejet
- 2020
- Einrichtung zur Erzeugung und Absaugung des Luftstroms LDevice for generating and extracting the airflow L
- 2121
- LuftzufuhranschlußAir supply port
- 2222
- Absauganschlußsuction connection
- DD
- Dicke des Gießkerns KThickness of the casting core K
- FF
- Formstoffmolding
- KK
- Gießkerncasting core
- LL
- trockener Luftstromdry airflow
- WW
- Strahlungswärmeradiant heat
Claims (18)
- A method for the manufacture of mould parts, in particular of casting cores, for casting moulds for the casting of molten metal,- wherein in a shoot-moulding machine a with the aid of filling elements, such as shooting nozzles (8) and shooting hood (6) mould material (F) containing an inorganic binding agent is filled (1), , into a cavity (12) of a mould tool (10) which determines the shape of the mould part (K) which is to be manufactured,- wherein heat is supplied to the mould material (F) filled into the mould tool (10) over a hardening period, in order for the mould material (F) to solidify due to the extraction of moisture, and- wherein, during the hardening period, at least the filling elements (6,8) of the shoot-moulding machine which contains mould material, and which are in a stand-by position during this hardening period, and are heated concomitantly by the radiant heat (W) emitted by the mould tool (10), are kept at a moisture content level which prevents the solidifying of the mould material (F), wherein at least one of the filling elements (6,8) heated concomitantly is subjected during the hardening period at least temporarily to a moist atmosphere.
- The method according to Claim 1, characterised in that the atmosphere is formed by moist air.
- The method according to Claim 1 or 2, characterised in that the atmosphere contains a sufficient quantity of moisture to form condensation at the filling elements (6,8) heated concomitantly by the heat from the mould tool (10).
- The method according to one of Claims 1 to 3, characterised in that the filling elements heated concomitantly are the shooting hood (6) and/or the shooting cylinder (5), into the interior of which the moist atmosphere is introduced.
- The method according to one of the proceeding claims, characterised in that, during the hardening period, at least temporary, at least one of the filling elements (6,8) heated concomitantly is cooled.
- The method according to Claim 5, characterised in that the filling element heated concomitantly is cooled to a temperature at which moisture condenses on it or in it.
- The method according to one of the proceeding claims, characterised in that, during the hardening period, at least temporary, at least one of the filling elements (6,8) heated concomitantly is brought into contact with a moisture carrier (17).
- The method according to Claim 7, characterised in that the moisture carrier (17) is an absorbent material soaked with a liquid, in particular water.
- The method according to one of Claims 5 to 8, characterised in that the filling element heated concomitantly is at least one shooting nozzle (8).
- The method according to one of the proceeding claims, characterised in that in the course of the hardening time the cavity (12) of the mould tool (10) is flowed through at least temporary by a hot gas (L), which is delivered dry and extracted loaded with moisture.
- The method according to Claim 10, characterised in that the gas (L) is delivered via the shooting opening (11) of the mould tool (10), provided for the introduction of the at least one shooting nozzle (8) and is led away via the venting openings (14) of the mould tool (14) .
- The method according to one of Claims 10 or 11, characterised in that the gas is air (L).
- A shoot-moulding machine for the manufacture of mould parts, in particular of casting cores (K) for casting moulds for the casting of molten metal heats- with a mould tool (10) having a cavity (12) which determines the shape of the mould part (K) which is to be manufactured,- with a heating device (15) for heating the mould tool (10),- with filling elements (6,8) for the introduction of mould material (F) into the mould tool (10), wherein the mould tool (10) can be moved relative to the filling elements (6,8) and/or the filling elements (6,8) can be moved relative to the mould tool (10) out of a filling position in which they are arranged closely adjacent to one another for the filling of the mould tool (10), into a stand-by position in which they are positioned distant from one another, and- with a moistening device (16,17), which, with the filling elements (6,8) located in the stand-by position, keeps those filling elements (6,8) moist which contain mould sand (F) and lie in the radiation range of the heat (W) emitted by the mould tool, wherein the moistening device (16) is connected to a gas supply, which delivers a moist gas to the moistening device (16).
- The shoot-moulding machine according to Claim 13, characterised in that the moistening device comprises a moisture carrier (17) which, with the filling elements (6,8) in the stand-by position, is in contact with at least one of these filling elements (8).
- The shoot-moulding machine according to Claim 14, characterised in that the moisture carrier (17) is formed by an absorbent material soaked with a liquid, in particular water.
- The shoot-moulding machine according to one of Claims 13 to 15, characterised in that at least one of the filling elements (8) is equipped with a cooling device, which, with the filling element (6,8) in the stand-by position, cools this filling element (8).
- The shoot-moulding machine according to one of Claims 13 to 16, characterised in that a dry gas supply is provided, which can be coupled to the mould tool (10), which, with the filling elements (6,8) in the stand-by position, conducts a dry gas (L) through the mould material (F) present in the cavity of the mould tool (10) .
- Use of a shoot-moulding machine (1) designed in accordance with one of Claims 13 to 17, for the performance of the method according to one of Claims 1 to 12.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10144193 | 2001-09-08 | ||
DE10144193A DE10144193C1 (en) | 2001-09-08 | 2001-09-08 | Production of molded parts involves pouring a molding material into a molding tool in an injection molding machine |
PCT/EP2002/010079 WO2003022487A1 (en) | 2001-09-08 | 2002-09-09 | Method and mould shooter for producing mould parts, such as casting cores, for casting moulds used to cast metal melts |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1444063A1 EP1444063A1 (en) | 2004-08-11 |
EP1444063B1 true EP1444063B1 (en) | 2008-04-30 |
Family
ID=7698262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02777041A Expired - Lifetime EP1444063B1 (en) | 2001-09-08 | 2002-09-09 | Method and mould shooter for producing mould parts, such as casting cores, for casting moulds used to cast metal melts |
Country Status (15)
Country | Link |
---|---|
US (1) | US20040250977A1 (en) |
EP (1) | EP1444063B1 (en) |
KR (1) | KR20040063117A (en) |
CN (1) | CN1292857C (en) |
AT (1) | ATE393676T1 (en) |
BR (1) | BR0212370A (en) |
CA (1) | CA2459430A1 (en) |
DE (2) | DE10144193C1 (en) |
ES (1) | ES2305307T3 (en) |
HU (1) | HUP0402386A2 (en) |
MX (1) | MXPA04002068A (en) |
PL (1) | PL204048B1 (en) |
RU (1) | RU2277453C2 (en) |
WO (1) | WO2003022487A1 (en) |
ZA (1) | ZA200401807B (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10340491B3 (en) * | 2003-09-03 | 2005-03-10 | Laempe & Gies Gmbh | Method and device for producing molds or cores |
DE102005057724B3 (en) * | 2005-12-01 | 2007-02-01 | Laempe & Mössner GmbH | Mold or core production by blasting mixture of sand and binder through orifices in blasting plate into mold or core tool and wetting mixture between blasts comprises ultrasonically atomizing wetting liquid |
US7819168B2 (en) * | 2006-07-27 | 2010-10-26 | Hunter Automated Machinery Corporation | Method and apparatus for transferring sand into flask of molding machine |
DE102010018751B4 (en) * | 2010-04-29 | 2015-08-13 | Laempe & Mössner GmbH | Method and device for producing molds or cores, in particular for foundry purposes |
CN102601319A (en) * | 2012-03-26 | 2012-07-25 | 苏州明志科技有限公司 | Shooting cylinder |
DE102013204619B3 (en) * | 2013-03-15 | 2014-05-15 | Bayerische Motoren Werke Aktiengesellschaft | Method for manufacturing molds or cores for foundry purpose, involves blowing shooting opening formed in core tool with cool gas having specific temperature which is lower than ambient temperature during two shooting processes |
KR101961295B1 (en) * | 2017-06-22 | 2019-03-25 | 안종민 | Device for manufacturing cores of sand mold casting |
KR102598965B1 (en) * | 2019-03-08 | 2023-11-06 | 현대자동차주식회사 | Apparatus for manufacturing core using inorganic binder |
DE102021002770A1 (en) * | 2021-05-28 | 2022-12-01 | Voxeljet Ag | 3D PRINTING PROCESS AND THE MOLDING PRODUCED USING WATER GLASS BINDER AND ESTER |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0780037B2 (en) * | 1990-02-23 | 1995-08-30 | 株式会社浪速製作所 | Lower mold fixed horizontal split mold making machine |
FR2687942B1 (en) * | 1992-02-27 | 1997-08-14 | Peugeot | PROCESS AND DEVICE FOR MOLDING CORES IN FOUNDRY SAND CONTAINING A CURABLE RESIN, PREVENTING THE BLOCKING OF SAND INJECTION NOZZLES. |
DE4208647C2 (en) * | 1992-03-18 | 1995-06-29 | Hottinger Adolf Masch | Device for shooting foundry cores or molds with molding materials |
DE4326180C2 (en) * | 1993-08-04 | 1997-01-30 | Hottinger Adolf Masch | Shot head for a core shooter |
EP0774311A1 (en) * | 1995-11-17 | 1997-05-21 | Sintokogio, Ltd. | Apparatus and method for producing a core |
DE19632293C2 (en) * | 1996-08-09 | 1999-06-10 | Thomas Prof Dr In Steinhaeuser | Process for the production of core moldings for foundry technology |
US6467525B2 (en) * | 2000-07-24 | 2002-10-22 | Hormel Foods, Llc | Gelatin coated sand core and method of making same |
-
2001
- 2001-09-08 DE DE10144193A patent/DE10144193C1/en not_active Expired - Fee Related
-
2002
- 2002-09-09 CA CA002459430A patent/CA2459430A1/en not_active Abandoned
- 2002-09-09 KR KR10-2004-7003461A patent/KR20040063117A/en not_active Application Discontinuation
- 2002-09-09 DE DE50212194T patent/DE50212194D1/en not_active Expired - Lifetime
- 2002-09-09 ES ES02777041T patent/ES2305307T3/en not_active Expired - Lifetime
- 2002-09-09 CN CNB028200519A patent/CN1292857C/en not_active Expired - Fee Related
- 2002-09-09 WO PCT/EP2002/010079 patent/WO2003022487A1/en active IP Right Grant
- 2002-09-09 PL PL367721A patent/PL204048B1/en unknown
- 2002-09-09 US US10/489,047 patent/US20040250977A1/en not_active Abandoned
- 2002-09-09 AT AT02777041T patent/ATE393676T1/en not_active IP Right Cessation
- 2002-09-09 EP EP02777041A patent/EP1444063B1/en not_active Expired - Lifetime
- 2002-09-09 HU HU0402386A patent/HUP0402386A2/en unknown
- 2002-09-09 BR BR0212370-3A patent/BR0212370A/en not_active IP Right Cessation
- 2002-09-09 RU RU2004110620/02A patent/RU2277453C2/en not_active IP Right Cessation
- 2002-09-09 MX MXPA04002068A patent/MXPA04002068A/en active IP Right Grant
-
2004
- 2004-03-04 ZA ZA200401807A patent/ZA200401807B/en unknown
Also Published As
Publication number | Publication date |
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MXPA04002068A (en) | 2005-04-29 |
HUP0402386A2 (en) | 2007-05-02 |
RU2277453C2 (en) | 2006-06-10 |
PL367721A1 (en) | 2005-03-07 |
ZA200401807B (en) | 2005-05-30 |
WO2003022487A1 (en) | 2003-03-20 |
US20040250977A1 (en) | 2004-12-16 |
DE10144193C1 (en) | 2002-10-31 |
BR0212370A (en) | 2004-08-17 |
KR20040063117A (en) | 2004-07-12 |
RU2004110620A (en) | 2005-06-10 |
PL204048B1 (en) | 2009-12-31 |
CA2459430A1 (en) | 2003-03-20 |
DE50212194D1 (en) | 2008-06-12 |
ES2305307T3 (en) | 2008-11-01 |
EP1444063A1 (en) | 2004-08-11 |
ATE393676T1 (en) | 2008-05-15 |
CN1292857C (en) | 2007-01-03 |
CN1568236A (en) | 2005-01-19 |
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