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WO1991001189A1 - Process and device for hardening foundry cores - Google Patents

Process and device for hardening foundry cores Download PDF

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Publication number
WO1991001189A1
WO1991001189A1 PCT/CH1990/000168 CH9000168W WO9101189A1 WO 1991001189 A1 WO1991001189 A1 WO 1991001189A1 CH 9000168 W CH9000168 W CH 9000168W WO 9101189 A1 WO9101189 A1 WO 9101189A1
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WO
WIPO (PCT)
Prior art keywords
catalyst
core
compressed air
nozzle
gas
Prior art date
Application number
PCT/CH1990/000168
Other languages
German (de)
French (fr)
Inventor
Werner Lüber
Original Assignee
Lueber Werner
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 Lueber Werner filed Critical Lueber Werner
Publication of WO1991001189A1 publication Critical patent/WO1991001189A1/en

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Classifications

    • 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 present invention relates to a method for hardening foundry cores from a mass containing sand, in which the core is exposed to a gas stream enriched with a catalyst and subsequently to a compressed air stream to harden it in the core molding tool.
  • Such cold-curing processes are known, such as the so-called coldbox process, in which two components of a synthetic resin system are added to the core sand, which then harden with the sand as soon as an amine, for example an alkylamine or a methyl formate, as Catalyst is added.
  • One component here could be, for example, a polyester resin, a polyether resin or any synthetic resin with a liquid consistency with reactive hydroxyl groups; the second The component is definitely an organic isocyanate.
  • the two components are thoroughly mixed with the molding sand and then molded. So far, various efforts have been made to catalyze the reaction here and to make the handling and use of the amines in particular reliable.
  • the known methods have a common disadvantage in that the curing process takes a considerable amount of time.
  • the shaping of the core sand mixture in the mold on a core shooting machine often takes only fractions of a second, whereas the subsequent gassing to harden the core has to take place over several seconds, which means that the gassing na ⁇ naturally makes it an enormous cost bearer.
  • a further method has subsequently become known, according to which metering pumps between the catalyst source and the mixing point of carrier gas and catalyst are to be switched on in order to be able to meter the catalyst better, which, however, can only lead to an unsatisfactory result here .
  • the catalyst Lysator is supplied in liquid form to a nozzle upstream of the heating stage, the outlet jet of which disintegrates under the influence of an atomizing gas additionally flowing through the nozzle.
  • This gas-assisted atomization of the catalytic converter achieves an optimal metering of the catalytic converter and an equally optimal mixture of liquid and gas, generally compressed air, without the hitherto customary use of metering containers, metering pumps and the like.
  • the metering and the mixing ratio is carried out only via pressure regulator and spray characteristics of the atomizing nozzle.
  • the present invention relates to a device for performing the method with an arrangement for producing a catalyst vapor / carrier gas mixture and with a compressed air source.
  • This device is characterized by an atomizing nozzle connected upstream of the heating stage, which is in flow connection with a gas source, in particular compressed air source, and also with a catalyst source via pressure-controlled feed lines.
  • Such a device can, as is readily recognizable, with the smallest, commercially available means, is extremely precise to control and practically maintenance-free.
  • the present invention relates to the use of the method according to the invention on a core shooting machine.
  • the device shown which can be connected to a core molding tool 1 of a core shooting machine (not shown in any more detail), for curing foundry cores, preferably using the cold box method, initially comprises, in a known manner, an arrangement 2 for producing a catalyst vapor / carrier gas mixture sches with connecting lines 3 and 4, which via control valves 5 and 6 to a catalyst source, not shown, respectively.
  • Compressed air source can be connected, and with a heating stage 7 upstream of the core molding tool 1 in the form of a heat exchanger or the like. in the feed line 8 to the core mold.
  • the catalyst is now in liquid form Directly fed to the atomizing nozzle 10 upstream of the heating stage 7 via an intermediate line 9 via a pressure regulator stage 11 downstream of the control valve 5 in the connecting line 3.
  • the compressed air is fed directly to this atomizing nozzle 10 via a pressure regulator stage 12 in the connecting line 4 which is connected downstream of the control valve 6.
  • the atomizing nozzle 10 can also be bridged by means of bypass 13 and bypass valve 14 in order to be able to press a larger amount of purging air through the core in the same time unit through this line with a larger flow cross section.
  • the atomizing nozzle 10 can be of different, conventional construction.
  • the liquid is applied to a film surface through a relatively large opening and flows, driven by the shear stress of the superimposed compressed air flow, in the form of a thin film Atomizing opening at which the film disintegrates.
  • the liquid is transported separately from the atomizing gas to the nozzle opening and flows in the form of a thin jet through the nozzle opening into one or more gas jets, where the liquid jet decays.
  • the atomizing nozzle 10 is preferably supplied with the liquid catalyst and also the carrier gas, here air, under pressure.
  • control valves 5 and 6 the pressure control stages 11 and 12 and the bypass valve 14 in a programmable and fully automatic manner via a computer and control stage 15.
  • any desired liquid concentration of the catalyst-gas mixture can be achieved, changes in the ambient temperature being able to be compensated for without further action, so that an option which has not been possible until now ⁇ lubrication of the curing process can be achieved with comparatively minimal effort.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention concerns a device for hardening foundry cores consisting of a sand-containing composition. In order to harden the core, it is exposed in the form tool (1) first to a stream of gas including an added catalyst and subsequently to a stream of compressed air. The device comprises a spray diffuser (10) located upstream of the heater (7) and connected by gas line both to a gas supply, in particular a compressed-air supply, and to a catalyst supply.

Description

Verfahren und Einrichtung zum Aushärten von Giesserei-Kernen Process and device for hardening foundry cores
Die vorliegende Erfindung betrifft ein Verfahren zum Aus¬ härten von Giesserei-Kernen aus einer Sand enthaltenden Masse, bei welchem der Kern zu seiner Härtung im Kern-Form¬ werkzeug einem mit einem Katalysator angereicherten Gasstrom und nachfolgend einem Druckluftstrom ausgesetzt wird.The present invention relates to a method for hardening foundry cores from a mass containing sand, in which the core is exposed to a gas stream enriched with a catalyst and subsequently to a compressed air stream to harden it in the core molding tool.
Solche kalthärtende Verfahren sind bekannt, wie etwa das so¬ genannte Coldbox-Verfahren, bei dem dem Kernsand zwei Kompo¬ nenten eines Kunstharzsystems zugefügt werden, welche dann mit dem Sand aushärten, sobald ein Amin, etwa ein Alkylamin oder ein Methyl-Formiat, als Katalysator zugegeben wird. Die eine Komponente könnte hierbei z.B. ein Polyesterharz, ein Polyätherharz oder ein beliebiges Kunstharz flüssiger Konsistenz mit reaktiven Hydroxylgruppen sein; die zweite Komponente ist auf jeden Fall ein organisches Isocyanat. Die beiden Komponenten werden mit dem Formsand gründlich vermischt und dann verformt. Um hier nun die Reaktion zu katalysieren und die Handhabung und den Gebrauch der ins¬ besondere Amine zuverlässig zu gestalten, sind bisher ver¬ schiedene Anstrengungen unternommen worden.Such cold-curing processes are known, such as the so-called coldbox process, in which two components of a synthetic resin system are added to the core sand, which then harden with the sand as soon as an amine, for example an alkylamine or a methyl formate, as Catalyst is added. One component here could be, for example, a polyester resin, a polyether resin or any synthetic resin with a liquid consistency with reactive hydroxyl groups; the second The component is definitely an organic isocyanate. The two components are thoroughly mixed with the molding sand and then molded. So far, various efforts have been made to catalyze the reaction here and to make the handling and use of the amines in particular reliable.
So ist es bereits seit längerer Zeit bekannt, ein Gemisch von tertiärem Alkylamin und Luft durch das Isocyanatharz- Sand-Gemisch zu drücken, wobei dieses Amin-Luft-Gemisch auf Temperaturen von 30 - 50 erwärmt wird, um alle Amintröpf- chen zu verdampfen.For example, it has been known for a long time to push a mixture of tertiary alkylamine and air through the isocyanate resin-sand mixture, this amine-air mixture being heated to temperatures of 30-50 in order to evaporate all the amine droplets.
Die bekannten Verfahren haben aber einen gemeinsamen Nach¬ teil, indem der Aushärtevorgang eine erhebliche Zeitdauer beansprucht. Beispielsweise nimmt die Ausformung des Kern¬ sand-Gemisches im Formwerkzeug auf einer Kern-Schiess-Ma- schine oft nur Bruchteile einer Sekunde in Anspruch, woge¬ gen die nachfolgende Begasung zur Aushärtung des Kernes über mehrere Sekunden zu erfolgen hat, was die Begasung na¬ türlich zu einem enormen Kostenträger macht.However, the known methods have a common disadvantage in that the curing process takes a considerable amount of time. For example, the shaping of the core sand mixture in the mold on a core shooting machine often takes only fractions of a second, whereas the subsequent gassing to harden the core has to take place over several seconds, which means that the gassing na ¬ naturally makes it an enormous cost bearer.
Um die Begasungszeit bzw. Aushärtezeit zu verringern, hat man dann in der Regel den Anteil der Amine überdosiert, un¬ ter der Gefahr, dass ein iederanlösen der Binder erfolgen konnte, was die mögliche Endfestigkeit des Kernes auf ca. 80 bis 85% vermindert.In order to reduce the gassing time or hardening time, the proportion of amines was generally overdosed, with the risk that the binder could be redissolved, which would reduce the possible final strength of the core to approx. 80 to 85% reduced.
Danach ist ein weiteres Verfahren bekannt geworden, nach dem Dosierpumpen zwischen der Katalysator-Quelle und der Mischstelle von Trägergas und Katalysator eingeschaltet werden sollen, um den Katalysator besser dosieren zu kön¬ nen, was allerdings auch hier nur zu einem unbefriedigen¬ den Ergebnis führen kann.A further method has subsequently become known, according to which metering pumps between the catalyst source and the mixing point of carrier gas and catalyst are to be switched on in order to be able to meter the catalyst better, which, however, can only lead to an unsatisfactory result here .
Eine unzureichende Dosierung ist deshalb gegeben, weil die¬ se, statt durch Oeffnen und Schliessen des Auslassventiles an der Quelle für den Katalysatordampf, hier zwar durch den Ansaugvorgang der Pumpe erfolgt, danach aber erst der "do¬ sierte" Katalysatordampf mit dem Trägergas, das hier eben¬ falls direkt aus der Druckluftquelle zugeführt wird, unmit¬ telbar vor dem Eintritt in den Kern gemischt werden muss. Abgesehen davon, dass der Einbau von Pumpen die Taktzeit vergrössert, hängt hier u.a. die Dosierung von mindestens den Temperaturänderungen an den unter Druck stehenden Quel¬ len für den Katalysatordampf und das Trägergas ab. Zudem wird auch bei einer Verwendung von höchstpräzisen Ventilen in der Regel mehr Katalysatordampf in den Kern einströmen als notwendig, da der Druck in den Quellen kaum konstant gehalten werden und so wieder ein Ueberschuεs vorberechnet werden muss. Nachteilig ist aber auch, dass jeder Einbau von Steuerglie¬ dern, Pumpen, Heizungsmitteln und dgl. in die Zuleitungen zwischen Quellen und Kern die Strömungswege verlängert und somit auch die Einströmzeit des Katalysatordampf-Trägergas- Gemisches und der nachfolgenden Spülluft in den Kern, was gerade die Aushärtezeiten verlängert statt verkürzt.Insufficient metering is given because instead of opening and closing the outlet valve at the source for the catalyst vapor, this takes place here through the suction process of the pump, but only afterwards the "metered" catalyst vapor with the carrier gas, the here is also supplied directly from the compressed air source, must be mixed immediately before entering the core. Apart from the fact that the installation of pumps increases the cycle time, the dosage depends here, among other things, on at least the temperature changes at the pressurized sources for the catalyst vapor and the carrier gas. In addition, even when using highly precise valves, more catalyst vapor will generally flow into the core than is necessary, since the pressure in the sources can hardly be kept constant and an excess must again be calculated. However, it is also disadvantageous that each installation of control members, pumps, heating means and the like in the supply lines between sources and core extends the flow paths and thus also the inflow time of the catalyst vapor / carrier gas mixture and the subsequent purge air into the core, which is precisely what the curing times are extended instead of shortened.
Etwas bessere Ergebnisse konnten dann dadurch erzielt wer¬ den, dass sowohl das Katalysatordampf-Trägergas-Gemisch als auch die Druckluft je in einem Dosierbehälter temporär ge¬ speichert und aus diesen Dosierbehältern dann nacheinander schlagartig in den Kern eingeschossen werden, wobei die Druckluft mit einem grösseren Volumen gespeichert und auf eine höhere Temperatur aufgeheizt wird als das Katalysator¬ dampf-Trägergas-Gemisch.Somewhat better results could then be achieved in that both the catalyst vapor / carrier gas mixture and the compressed air were each temporarily stored in a metering container and then suddenly injected into the core from these metering containers, the compressed air being at a greater rate Volume is stored and heated to a higher temperature than the catalyst vapor-carrier gas mixture.
Für diese Massnahmen aber ist der technische Aufwand enorm.However, the technical effort for these measures is enormous.
Es ist deshalb Aufgabe der vorliegenden Erfindung, ein Ver¬ fahren der vorgenannten Art zu schaffen, das bei geringster Begasungszeit und optimalster Dosierung des erforderlichen Katalysators einen vergleichsweise dem Stand der Technik minimalsten technischen Aufwand erfordert.It is therefore an object of the present invention to provide a method of the aforementioned type which, with the shortest gassing time and optimal metering of the required catalyst, requires a minimally technical outlay compared to the prior art.
Dies wird erfindungsgemäss dadurch erreicht, dass zur Her¬ stellung des Katalysatordampf-Trägergas-Gemisches der Kata- lysator in flüssiger Form einer der Heizstufe vorgeschal¬ teten Düse zugeführt wird, wobei deren Austrittsstrahl un¬ ter dem Einfluss eines zusätzlich durch die Düse strömenden Zerstäubungsgases zerfällt.This is achieved according to the invention in that for the preparation of the catalyst vapor / carrier gas mixture the catalyst Lysator is supplied in liquid form to a nozzle upstream of the heating stage, the outlet jet of which disintegrates under the influence of an atomizing gas additionally flowing through the nozzle.
Durch diese gasunterstützte Zerstäubung des Katalysators wird eine optimale Dosierung des Katalysators und eine ebenso optimale Mischung von Flüssigkeit und Gas, in der Regel Druckluft, erreicht ohne den bisher üblichen Auf¬ wand an Dosierbehältern, Dosierpumpen u. dgl., indem hier die Dosierung und das Mischungsverhältnis lediglich über Druckregler und Spritzcharakteristik der Zerstäubungsdüse erfolgt.This gas-assisted atomization of the catalytic converter achieves an optimal metering of the catalytic converter and an equally optimal mixture of liquid and gas, generally compressed air, without the hitherto customary use of metering containers, metering pumps and the like. The like. Here, the metering and the mixing ratio is carried out only via pressure regulator and spray characteristics of the atomizing nozzle.
Ferner betrifft die vorliegende Erfindung eine Einrichtung zur Durchführung des Verfahrens mit einer Anordnung zur Erzeugung eines Katalysatordampf-Trägergas-Gemisches und mit einer Druckluftquelle.Furthermore, the present invention relates to a device for performing the method with an arrangement for producing a catalyst vapor / carrier gas mixture and with a compressed air source.
Diese Einrichtung zeichnet sich aus durch eine der Hei¬ zungsstufe vorgeschalteten Zerstäubungsdüse, welche über druckgeregelte Zuleitungen sowohl mit einer Gasquelle, ins¬ besondere Druckluftquelle, als auch mit einer Katalysator¬ quelle in Strömungsverbindung steht.This device is characterized by an atomizing nozzle connected upstream of the heating stage, which is in flow connection with a gas source, in particular compressed air source, and also with a catalyst source via pressure-controlled feed lines.
Eine solche Einrichtung lässt sich, wie ohne weiteres er- kennbar, mit geringsten, handelsüblichen Mitteln aufbauen, ist äusserst präzise zu steuern und praktisch wartungsfrei.Such a device can, as is readily recognizable, with the smallest, commercially available means, is extremely precise to control and practically maintenance-free.
Ferner betrifft die vorliegende Erfindung die Verwendung des erfindungsgemässen Verfahrens an einer Kern-Schiess- Maschine.Furthermore, the present invention relates to the use of the method according to the invention on a core shooting machine.
Eine beispielsweise Ausführungsform einer Einrichtung zur Durchführung des erfindungsgemässen Verfahrens ist nachfol¬ gend anhand der Zeichnung, welche im Blockschema eine Ein¬ richtung zum Aushärten von Giesserei-Kernen im Coldbox-Ver¬ fahren zeigt, näher erläutert.An example of an embodiment of a device for carrying out the method according to the invention is explained in more detail below with reference to the drawing, which shows in the block diagram a device for hardening foundry cores in the cold box method.
Die gezeigte, an ein Kern-Formwerkzeug 1 einer nicht näher gezeigten Kern-Schiess-Maschine anschliessbare Einrichtung zum Aushärten von Giesserei-Kernen vorzugsweise im Coldbox- Verfahren umfasst zunächst in bekannter Weise eine Anord¬ nung 2 zur Erzeugung eines Katalysatordampf-Trägergas-Gemi¬ sches mit Anschlussleitungen 3 und 4, welche über Regelven¬ tile 5 und 6 an eine nicht näher veranschaulichte Kataly¬ satorquelle resp. Druckluftquelle anschliessbar sind, sowie mit einer, dem Kern-Formwerkzeug 1 vorgeschalteten Heizstu¬ fe 7 in Form eines Wärmeaustauschers o.dgl. in der Zuführ¬ leitung 8 zum Kern-Formwerkzeug.The device shown, which can be connected to a core molding tool 1 of a core shooting machine (not shown in any more detail), for curing foundry cores, preferably using the cold box method, initially comprises, in a known manner, an arrangement 2 for producing a catalyst vapor / carrier gas mixture sches with connecting lines 3 and 4, which via control valves 5 and 6 to a catalyst source, not shown, respectively. Compressed air source can be connected, and with a heating stage 7 upstream of the core molding tool 1 in the form of a heat exchanger or the like. in the feed line 8 to the core mold.
Erfindungsgemass wird nun der Katalysator in flüssiger Form direkt einer der Heizstufe 7 über eine Zwiεchenleitung 9 vorgeschalteten Zerstäubungsdüse 10 über eine, dem Regel¬ ventil 5 nachgeschaltete Druckreglerstufe 11 in der An¬ schlussleitung 3 zugeleitet.According to the invention, the catalyst is now in liquid form Directly fed to the atomizing nozzle 10 upstream of the heating stage 7 via an intermediate line 9 via a pressure regulator stage 11 downstream of the control valve 5 in the connecting line 3.
Ferner wird dieser Zerstäubungsdüse 10 die Druckluft direkt über eine, dem Regelventil 6 nachgeschaltete Druckregler¬ stufe 12 in der Anschlussleitung 4 zugeleitet.Furthermore, the compressed air is fed directly to this atomizing nozzle 10 via a pressure regulator stage 12 in the connecting line 4 which is connected downstream of the control valve 6.
Wahlweise kann aber auch die Zerst ubungsduse 10 mittels Bypass 13 und Bypassventil 14 überbrückt werden, um durch diese Leitung mit dann grösserem Strömungsquerschnitt eine grössere Menge Spülluft in gleicher Zeiteinheit durch den Kern drücken zu können.Optionally, however, the atomizing nozzle 10 can also be bridged by means of bypass 13 and bypass valve 14 in order to be able to press a larger amount of purging air through the core in the same time unit through this line with a larger flow cross section.
Die Zerstäubungsdüse 10 kann von unterschiedlicher, konven¬ tioneller Bauweise sein.The atomizing nozzle 10 can be of different, conventional construction.
Bei einer ersten Bauart solcher druckluftunterstützten Zer¬ stäuber, die einen Flüssigkeitsfilm erzeugen, wird die Flüs¬ sigkeit durch eine relativ grosse Oeffnung auf eine Film¬ fläche aufgebracht und fliesst, von der Schubspannung des überlagerten Druckluftstromes getrieben, in Form eines dün¬ nen Filmes zur Zerεtäubungsöffnung, an welcher der Zerfall des Filmes stattfindet. Bei einer zweiten Bauart wird die Flüssigkeit getrennt vom Zerstäubungsgas bis zu der Düsenöffnung transportiert und fliesst in Form eines dünnen Strahls durch die Düsenδffnung in einen oder mehrere Gasstrahlen, wo der Zerfall des Flüs¬ sigkeitsstrahls stattfindet.In a first design of such compressed air-assisted atomizers, which produce a liquid film, the liquid is applied to a film surface through a relatively large opening and flows, driven by the shear stress of the superimposed compressed air flow, in the form of a thin film Atomizing opening at which the film disintegrates. In a second design, the liquid is transported separately from the atomizing gas to the nozzle opening and flows in the form of a thin jet through the nozzle opening into one or more gas jets, where the liquid jet decays.
Vorzugsweise wird der Zerstäubungsdüse 10 der flüssige Ka¬ talysator wie auch das Trägergas, hier Luft, unter Druck zugeführt.The atomizing nozzle 10 is preferably supplied with the liquid catalyst and also the carrier gas, here air, under pressure.
Es ist aber auch ohne weiteres möglich, den flüssigen Ka¬ talysator durch Saugwirkung oder Schwerkraft zuzuführen.However, it is also easily possible to supply the liquid catalyst by suction or gravity.
Selbstverständlich ist es weiter möglich, sämtliche Steuer¬ glieder, wie die Regelventile 5 und 6, die Druckreglerstu¬ fen 11 und 12 sowie das Bypassventil 14 über einen Rechner und Steuerstufe 15 vorprogrammierbar und vollautomatisch zu steuern.Of course, it is also possible to control all the control elements, such as the control valves 5 and 6, the pressure control stages 11 and 12 and the bypass valve 14, in a programmable and fully automatic manner via a computer and control stage 15.
Mit dieser Steuerung der Druckkombinationen sowie die ent¬ sprechende Wahl der Düse mit vorgegebener Düsenpaarung lässt sich jede gewünschte Flüssigkeitskonzentration des Katalysator-Gas-Gemisches erreichen, wobei sich ohne wei¬ teres auch Aenderungen der Umgebungstemperatur ausgleichen lassen, so dass nunmehr eine bisher nicht mögliche Opti¬ mierung des Aushärtvorganges bei vergleichsweise minimalstem Aufwand erzielbar ist. With this control of the pressure combinations and the corresponding selection of the nozzle with a given pair of nozzles, any desired liquid concentration of the catalyst-gas mixture can be achieved, changes in the ambient temperature being able to be compensated for without further action, so that an option which has not been possible until now ¬ lubrication of the curing process can be achieved with comparatively minimal effort.

Claims

Patentansprüche Claims
1. Verfahren zum Aushärten von Giesserei-Kernen aus einer Sand enthaltenden Masse, bei welchem der Kern zu seiner Härtung im Kern-Formwerkzeug einem mit einem Katalysa¬ tor angereicherten Gasstrom und nachfolgend einem Druck¬ luftstrom ausgesetzt wird, dadurch gekennzeichnet, dass zur Herstellung des Katalysatordampf-Trägergas-Gemisches der Katalysator in flüssiger Form einer der Heizstufe vorgeschalteten Düse zugeführt wird, wobei deren Aus¬ trittsstrahl unter dem Einfluss eines zusätzlich durch die Düse strömenden Zerstäubungsgases zerfallt.1. A method for curing foundry cores from a mass containing sand, in which the core is exposed to a gas stream enriched with a catalyst and subsequently to a compressed air stream for its hardening in the core molding tool, characterized in that for the production of the Catalyst vapor-carrier gas mixture, the catalyst is supplied in liquid form to a nozzle upstream of the heating stage, the outlet jet of which disintegrates under the influence of an atomizing gas additionally flowing through the nozzle.
2. Einrichtung zur Durchführung des Verfahrens nach An¬ spruch 1 , mit einer Anordnung zur Erzeugung eines Ka¬ talysatordampf-Trägergas-Gemisches und mit einer Druck¬ luftquelle, gekennzeichnet durch eine der Heizungsstu¬ fe (7) vorgeschalteten Zerstäubungsdüse (10), welche über druckgeregelte Zuleitungen (3 und 4) sowohl mit einer Gasquelle, insbesondere Druckluftquelle, als auch mit einer Katalysatorquelle in Strömungsverbindung steht.2. Device for carrying out the method according to claim 1, with an arrangement for producing a catalyst vapor / carrier gas mixture and with a compressed air source, characterized by an atomizing nozzle (10) connected upstream of the heating stage (7), which is in flow connection with a gas source, in particular compressed air source, and also with a catalyst source via pressure-controlled feed lines (3 and 4).
3. Verwendung des Verfahrens nach Anspruch 1 an einer Kern- Schiess-Maschine. 3. Use of the method according to claim 1 on a core shooting machine.
PCT/CH1990/000168 1989-07-14 1990-07-11 Process and device for hardening foundry cores WO1991001189A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2648/89-9 1989-07-14
CH264889A CH679913A5 (en) 1989-07-14 1989-07-14

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WO1991001189A1 true WO1991001189A1 (en) 1991-02-07

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CH (1) CH679913A5 (en)
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Cited By (3)

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US7142846B1 (en) 1994-01-05 2006-11-28 Henderson Daniel A Method and apparatus for improved paging receiver and system
US7251318B1 (en) 1994-01-05 2007-07-31 Intellect Wireless Inc. Method and apparatus for improved personal communication devices and systems
US7266186B1 (en) 1994-01-05 2007-09-04 Intellect Wireless Inc. Method and apparatus for improved paging receiver and system

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DE3543960A1 (en) * 1985-12-12 1987-06-19 Michel Horst Werner Apparatus for the curing of cores and/or moulds made from sand with the use of a binder and used for casting castings composed of metallic or non-metallic molten starting materials
EP0229959A1 (en) * 1985-12-19 1987-07-29 Werner Lüber Device for hardening foundry cores
CH667821A5 (en) * 1985-08-02 1988-11-15 Werner Lueber Appts. for hardening casting cores - having time valves controlling the flow of air and hardener gas through core box
EP0310802A1 (en) * 1987-10-02 1989-04-12 Franz Gähler Process and apparatus for making foundry sand moulds and sand cores utilizing a binder

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Publication number Priority date Publication date Assignee Title
GB1352562A (en) * 1968-02-26 1974-05-08 Sherwin Williams Co Foundry sand article forming machine and method
CH667821A5 (en) * 1985-08-02 1988-11-15 Werner Lueber Appts. for hardening casting cores - having time valves controlling the flow of air and hardener gas through core box
DE3543960A1 (en) * 1985-12-12 1987-06-19 Michel Horst Werner Apparatus for the curing of cores and/or moulds made from sand with the use of a binder and used for casting castings composed of metallic or non-metallic molten starting materials
EP0229959A1 (en) * 1985-12-19 1987-07-29 Werner Lüber Device for hardening foundry cores
EP0310802A1 (en) * 1987-10-02 1989-04-12 Franz Gähler Process and apparatus for making foundry sand moulds and sand cores utilizing a binder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7142846B1 (en) 1994-01-05 2006-11-28 Henderson Daniel A Method and apparatus for improved paging receiver and system
US7251318B1 (en) 1994-01-05 2007-07-31 Intellect Wireless Inc. Method and apparatus for improved personal communication devices and systems
US7266186B1 (en) 1994-01-05 2007-09-04 Intellect Wireless Inc. Method and apparatus for improved paging receiver and system
US7305076B1 (en) 1994-01-05 2007-12-04 Intellect Wireless Inc. Method and apparatus for improved paging receiver and system
US7349532B2 (en) 1994-01-05 2008-03-25 Intellect Wireless Inc. Picture and video message center system

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CH679913A5 (en) 1992-05-15

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