EP1375031B1 - Method and device for hardening foundry cores - Google Patents
Method and device for hardening foundry cores Download PDFInfo
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- EP1375031B1 EP1375031B1 EP02024017A EP02024017A EP1375031B1 EP 1375031 B1 EP1375031 B1 EP 1375031B1 EP 02024017 A EP02024017 A EP 02024017A EP 02024017 A EP02024017 A EP 02024017A EP 1375031 B1 EP1375031 B1 EP 1375031B1
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- Prior art keywords
- core
- compressed air
- heating
- amine
- gas
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- 238000000034 method Methods 0.000 title claims description 17
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 150000001412 amines Chemical class 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 239000012159 carrier gas Substances 0.000 claims abstract description 21
- 239000003054 catalyst Substances 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 20
- 238000011010 flushing procedure Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims 11
- 238000007493 shaping process Methods 0.000 claims 10
- 230000000903 blocking effect Effects 0.000 claims 1
- 239000012778 molding material Substances 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000002309 gasification Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000001723 curing Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 4
- 238000003958 fumigation Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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 curing foundry cores from sand-containing moldings, in which the core for curing in a core mold via a gas-tight coupling to the core mold gassing a catalyst vapor carrier gas mixture and then a compressed air flow, each with predetermined pressure and temperature is suspended.
- Such cold curing methods are known, such as the so-called cold box method, 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, such as an alkylamine or a methyl formate, is added as a catalyst.
- an amine such as an alkylamine or a methyl formate
- the one component could be e.g. a polyester resin, a polyether resin or any synthetic resin of liquid consistency with reactive hydroxyl groups; the second component is definitely an organic isocyanate.
- the two components are thoroughly mixed with the foundry sand and then deformed. In order to catalyze the reaction now and to make the handling and use of particular amines reliable, various efforts have been made so far.
- the known methods have a common disadvantage in that the curing process takes a considerable amount of time.
- the formation of the core-sand mixture in the mold on a core-shooting machine often takes only a fraction of a second, whereas the subsequent gassing to harden the core has to be done over several seconds, which of course fumigations to an enormous cost bearer power.
- valve means comprise a reusable valve in the feed line of the feed tank, which can be temporarily switched to a return line to the feed tank for pressure equalization in the flow system.
- the object of the present invention is now to provide a method for curing foundry cores from sand-containing moldings, which method ensures a significantly shortened gassing and rinsing time with a minimum of necessary amine.
- the amine dosed in liquid form is fed to a heating and mixing stage and is converted there into its gaseous state; that then, after gas-tight coupling of the gassing plate, for a timed gassing heated compressed air within a given time and under proportional pressure increase passed through the loaded with the Amingas heater and mixing stage and from there as a catalyst vapor carrier gas mixture through the sand-containing molding material in the core Mold is passed through; and that then for a time-controlled flushing heated compressed air is passed within a predetermined time via separate supply means through the fumigated sand-containing molding material in the core mold.
- a preferred embodiment of the inventive method then it is that the compressed air for fumigation with increasing heating of the catalyst vapor-carrier gas mixture is variably heated to achieve a so-called contour hardening.
- the compressed air serving as scavenging air is additionally heatable, if pressure equalization is further established before the introduction of the amine in liquid form into the heating and mixing stage in the forerunner and if the catalyst-vapor-carrier gas mixture is on its way to the core. Forming tool is heat-accompanied.
- the present invention relates to a device for carrying out the method for curing foundry cores from sand-containing moldings, in which means the core for its curing in a core mold via a gas-tight coupling on the core mold gassing plate o.
- Carrier gas mixture and subsequently a compressed air flow, each with a predetermined pressure and temperature is exposed.
- this device is distinguished by the fact that the amine in liquid form passes from a storage container by means of a flow meter or the like into a heating and mixing stage where it is converted into its gaseous state, and which heating and mixing stage is additionally connected to a compressed air source a proportional pressure regulator and a preheater and change-over valve means is in flow communication in order for a timed Gassing heated compressed air within a given time to pass through the charged with the Amingas heater and mixing stage, which heater and mixing stage via a closable by a valve line with the core mold, respectively.
- the gassing plate is connected to pass the catalyst vapor-carrier gas mixture through the sand-containing molding material in the core mold, wherein for a timed flushing with the heated compressed air, the compressed air source via the switching valve means and optionally a reheater and a check valve with the core mold resp. the gassing plate is in fluid communication.
- the compressed air preheater be switched on a temperature control and before the supply of the amine in liquid form in the heater and mixing stage of the flow of the liquid amine container with the flow meter via a switching temporarily to a return line be switched to the reservoir for pressure equalization in the flow system.
- the shown connectable to a core mold 20 of a core shooting machine, not shown, means for curing foundry cores from a sand-containing molding material, first comprising a gas-tight coupled to the core mold 20 gassing plate or hood 30 with an upstream heater and mixing stage 17 for transferring the liquid amine in its gaseous state and for generating a fumigation of the core serving catalyst vapor.
- Carrier gas mixture as will be explained in more detail below.
- the amine passes in liquid form from a reservoir 4 by means of flow meter 9 o. The like. Dosed into the heater and mixing stage 17, where it is converted into its gaseous state.
- the heating and mixing stage 17 is also connected to a compressed air source 21 via a proportional pressure regulator 1 and a preheater 16 and switching valve 3 in flow communication to pass for a timed fumigation compressed air within a given time through the charged with the Amingas heater and mixing stage 17 which heating and mixing stage 17 via a closable by a valve 11 and preferably heatable line 15 with the core mold 20, respectively.
- the gassing plate 30 is connected to pass the catalyst vapor-carrier gas mixture through the sand-containing molding material in the core mold 20, wherein for a timed purging with the heated compressed air, the compressed air source 21 via the switching valve 3 and optionally a reheater 18 and a check valve 12 with the core mold 20 respectively.
- the gassing plate 30 is in fluid communication.
- a temperature control 22 is connected to the preheater 16 for a variable heatability of the compressed air.
- the heating and mixing stage 17, a temperature controller 23 and the reheater 18, a temperature control 24 is switched on.
- the gassing plate 30 is provided with a vent valve 13.
- the respective switches and controls are programmably controllable via a control circuit 14.
- the compressed air used as purging air can be additionally heated and further prepared before the supply of the amine in liquid form in the heating and mixing stage in the flow pressure equalization and the catalyst vapor carrier gas mixture are heat-accompanied on its way to the core mold.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
- Casting Devices For Molds (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zum Aushärten von Giesserei-Kernen aus sandhaltigen Formstoffen, bei welchem der Kern zu seiner Härtung in einem Kern-Formwerkzeug über eine am Kern-Formwerkzeug gasdicht ankoppelbare Begasungsplatte einem Katalysatordampf-Trägergas-Gemisch und nachfolgend einem Druckluftstrom, je mit vorgegebenem Druck und vorgegebener Temperatur, ausgesetzt wird.The present invention relates to a method for curing foundry cores from sand-containing moldings, in which the core for curing in a core mold via a gas-tight coupling to the core mold gassing a catalyst vapor carrier gas mixture and then a compressed air flow, each with predetermined pressure and temperature is suspended.
Solche kalthärtenden Verfahren sind bekannt, wie etwa das sogenannte Coldbox-Verfahren, bei dem dem Kernsand zwei Komponenten eines Kunstharzsystems zugefügt werden, welche dann mit dem Sand aushärten, sobald ein Amin, etwa ein Alkylamin oder ein Methyl-Formiat, als Katalysator zugegeben wird.Such cold curing methods are known, such as the so-called cold box method, 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, such as an alkylamine or a methyl formate, is added as a catalyst.
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 insbesondere Amine zuverlässig zu gestalten, sind bisher verschiedene Anstrengungen unternommen worden.The one component could be e.g. a polyester resin, a polyether resin or any synthetic resin of liquid consistency with reactive hydroxyl groups; the second component is definitely an organic isocyanate. The two components are thoroughly mixed with the foundry sand and then deformed. In order to catalyze the reaction now and to make the handling and use of particular amines reliable, various efforts have been made so far.
Die bekannten Verfahren haben aber einen gemeinsamen Nachteil, indem der Aushärtevorgang eine erhebliche Zeitdauer beansprucht. Beispielsweise nimmt die Ausformung des Kern-Sand-Gemisches im Formwerkzeug auf einer Kern-Schiess-Maschine oft nur Bruchteile einer Sekunde in Anspruch, wogegen die nachfolgende Begasung zur Aushärtung des Kernes über mehrere Sekunden zu erfolgen hat, was die Begasung natürlich 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 formation of the core-sand mixture in the mold on a core-shooting machine often takes only a fraction of a second, whereas the subsequent gassing to harden the core has to be done over several seconds, which of course fumigations to an enormous cost bearer power.
Um die Begasungszeit bzw. Aushärtezeit zu verringern, hat man dann in der Regel den Anteil der Amine überdosiert, unter der Gefahr, dass ein Wiederanlösen der Binder erfolgen konnte, was die mögliche Endfestigkeit des Kernes auf ca. 80 bis 85% vermindert.In order to reduce the gassing time or curing time, it has then generally overdosed the proportion of amines, with the risk that a redissolution of the binder could take place, which reduces the possible final strength of the core to about 80 to 85%.
Bei einem weiteren Verfahren (EP 0229959 der gleichen Anmelderin) werden Dosierpumpen zwischen der Katalysator-Quelle und der Mischstelle von Trägergas und Katalysator eingeschaltet, um den Katalysator besser dosieren zu können, was allerdings auch hier nur zu einem unbefriedigenden Ergebnis führen kann, da die Druckverhältnisse im Katalysator-Vorlauf bei jedem Dosiervorgang zunächst absolut indifferent sind.In another method (EP 0229959 of the same Applicant) metering pumps between the catalyst source and the mixing point of carrier gas and catalyst turned on in order to dose the catalyst better, but this can only lead to an unsatisfactory result, since the pressure conditions in the catalyst flow at each dosing initially are absolutely indifferent.
Weiter wurde vorgeschlagen (CH-Patent 603276 der gleichen Anmelderin), sowohl das Katalysatordampf-Trägergas-Gemisch als auch die Druckluft je in einem Dosierbehälter temporär zu speichern und aus diesen Dosierbehältern dann nacheinander schlagartig in den Kern einzuschiessen, wobei die Druckluft mit einem grösseren Volumen gespeichert und auf eine höhere Temperatur aufgeheizt wird als das Katalysatordampf-Trägergas-Gemisch. Für diese Massnahmen aber ist der technische Aufwand enorm und Anlagen dieser Art lassen wenig Variable zu.It has also been proposed (CH patent 603276 of the same Applicant) to temporarily store both the catalyst vapor-carrier gas mixture and the compressed air in a metering container and then from these metering containers successively abruptly into the core, wherein the compressed air with a larger volume is stored and heated to a higher temperature than the catalyst vapor-carrier gas mixture. For these measures, however, the technical complexity is enormous and systems of this kind allow little variable.
Ferner beschreibt die EP 0881 014 der gleichen Anmelderin ein Verfahren der vorgenannten Art, bei dem die Ventilmittel ein Mehrweg-Ventil in der Vorlaufleitung des Vorlagebehälters umfassen, welches temporär auf eine Rücklaufleitung zum Vorlagebehälter umschaltbar ist zum Druckausgleich im Vorlaufsystem.Furthermore, EP 0881 014 of the same applicant describes a method of the aforementioned type, in which the valve means comprise a reusable valve in the feed line of the feed tank, which can be temporarily switched to a return line to the feed tank for pressure equalization in the flow system.
Diese Massnahmen gestatten, die Druckverhältnisse im Katalysator-Vorlauf bei jedem Dosiervorgang konstant zu halten, nachdem vorgängig jeweils Druckausgleich erfolgt.These measures make it possible to keep the pressure ratios in the catalyst flow constant at each dosing, after each pressure equalization takes place in advance.
Der heutigen Technik entsprechend sind dabei die betreffenden Umschaltungen programmsteuerbar.In accordance with today's technology, the relevant switching operations are program-controllable.
Aufgabe der vorliegenden Erfindung ist nun ein Verfahren zum Aushärten von Giesserei-Kernen aus sandhaltigen Formstoffen zu schaffen, welches Verfahren eine wesentlich verkürzte Begasungs- und Spülzeit bei einem Minimum an notwendigem Amin gewährleistet.The object of the present invention is now to provide a method for curing foundry cores from sand-containing moldings, which method ensures a significantly shortened gassing and rinsing time with a minimum of necessary amine.
Dies wird erfindungsgemäss zunächst dadurch erreicht,
dass, vorzugsweise während des Kemschusses, das,Amin in flüssiger Form dosiert einer Erhitzer- und Mischstufe zugeführt und dort in seinen gasförmigen Zustand überführt wird;
dass dann, nach gasdichter Ankopplung der Begasungsplatte, für eine zeitgesteuerte Begasung erhitzte Druckluft innerhalb einer vorgegebenen Zeit und unter proportionalem Druckanstieg durch die mit dem Amingas belasteten Erhitzer- und Mischstufe hindurchgeführt und von dort als Katalysatordampf-Trägergas-Gemisch durch den sandhaltigen Formstoff im Kern-Formwerkzeug hindurchgeleitet wird; und
dass dann für eine zeitgesteuerte Spülung erhitzte Druckluft innerhalb einer vorgegebenen Zeit über separate Zuleitungsmittel durch den begasten sandhaltigen Formstoff im Kern-Formwerkzeug hindurchgeleitet wird.This is achieved according to the invention initially by
that, preferably during the Kemschusses, the amine dosed in liquid form is fed to a heating and mixing stage and is converted there into its gaseous state;
that then, after gas-tight coupling of the gassing plate, for a timed gassing heated compressed air within a given time and under proportional pressure increase passed through the loaded with the Amingas heater and mixing stage and from there as a catalyst vapor carrier gas mixture through the sand-containing molding material in the core Mold is passed through; and
that then for a time-controlled flushing heated compressed air is passed within a predetermined time via separate supply means through the fumigated sand-containing molding material in the core mold.
Eine bevorzugte Ausgestaltung des erfindungsgemässen Verfahrens besteht dann darin, dass die Druckluft für eine Begasung mit steigender Erhitzung des Katalysatordampf-Trägergas-Gemisches variabel erhitzbar ist, um eine sogenannte Konturenhärtung zu erreichen.A preferred embodiment of the inventive method then it is that the compressed air for fumigation with increasing heating of the catalyst vapor-carrier gas mixture is variably heated to achieve a so-called contour hardening.
Ferner ist es vorteilhaft, wenn die als Spülluft dienende Druckluft zusätzlich erhitzbar ist, wenn weiter vor der Zuführung des Amins in flüssiger Form in die Erhitzer- und Mischstufe im Vorlauf Druckausgleich hergestellt wird und wenn das Katalysatordampf-Trägergas-Gemisch auf seinem Weg zum Kern-Formwerkzeug wärmebegleitet ist.Furthermore, it is advantageous if the compressed air serving as scavenging air is additionally heatable, if pressure equalization is further established before the introduction of the amine in liquid form into the heating and mixing stage in the forerunner and if the catalyst-vapor-carrier gas mixture is on its way to the core. Forming tool is heat-accompanied.
Ferner betrifft die vorliegende Erfindung eine Einrichtung zur Durchführung des Verfahrens zum Aushärten von Giesserei-Kernen aus sandhaltigen Formstoffen, bei welcher Einrichtung der Kern zu seiner Härtung in einem Kern-Formwerkzeug über eine am Kern-Formwerkzeug gasdicht ankoppelbare Begasungsplatte o. dgl. einem Katalysatordampf-Trägergas-Gemisch und nachfolgend einem Druckluftstrom, je mit vorgegebenem Druck und vorgegebener Temperatur, ausgesetzt wird.Furthermore, the present invention relates to a device for carrying out the method for curing foundry cores from sand-containing moldings, in which means the core for its curing in a core mold via a gas-tight coupling on the core mold gassing plate o. The like. Carrier gas mixture and subsequently a compressed air flow, each with a predetermined pressure and temperature is exposed.
Erfindungsgemäss zeichnet sich diese Einrichtung dadurch aus, dass das Amin in flüssiger Form aus einem Vorratsbehälter mittels Durchflussmesser o. dgl. dosiert in eine Erhitzer- und Mischstufe gelangt und dort in seinen gasförmigen Zustand überführt wird, welche Erhitzer- und Mischstufe zudem mit einer Druckluftquelle über einen proportionalen Druckregler und einen Vorerhitzer sowie Umschaltventilmittel in Strömungsverbindung steht, um für eine zeitgesteuerte Begasung erhitzte Druckluft innerhalb einer vorgegebenen Zeit durch die mit dem Amingas belasteten Erhitzer- und Mischstufe hindurchzuführen, welche Erhitzer- und Mischstufe über eine durch ein Ventil verschliessbare Leitung mit dem Kern-Formwerkzeug resp. der Begasungsplatte verbunden ist, um das Katalysatordampf-Trägergas-Gemisch durch den sandhaltigen Formstoff im Kern-Formwerkzeug hindurchzuleiten, wobei für eine zeitgesteuerte Spülung mit der erhitzten Druckluft die Druckluftquelle über die Umschaltventilmittel und gegebenenfalls einem Nacherhitzer und einem Sperrventil mit dem Kern-Formwerkzeug resp. der Begasungsplatte in Strömungsverbindung steht.According to the invention, this device is distinguished by the fact that the amine in liquid form passes from a storage container by means of a flow meter or the like into a heating and mixing stage where it is converted into its gaseous state, and which heating and mixing stage is additionally connected to a compressed air source a proportional pressure regulator and a preheater and change-over valve means is in flow communication in order for a timed Gassing heated compressed air within a given time to pass through the charged with the Amingas heater and mixing stage, which heater and mixing stage via a closable by a valve line with the core mold, respectively. the gassing plate is connected to pass the catalyst vapor-carrier gas mixture through the sand-containing molding material in the core mold, wherein for a timed flushing with the heated compressed air, the compressed air source via the switching valve means and optionally a reheater and a check valve with the core mold resp. the gassing plate is in fluid communication.
Hierbei kann in vorteilhafter Ausgestaltung für eine variable Erhitzbarkeit der Druckluft dem Vorerhitzer eine Temperatursteuerung zugeschaltet sein und vor der Zuführung des Amins in flüssiger Form in die Erhitzer- und Mischstufe der Vorlauf des Flüssig-Amin-Behälters mit dem Durchflussmesser über ein Umschaltventil temporär auf eine Rücklaufleitung zum Vorlagebehälter umgeschaltet werden zum Druckausgleich im Vorlaufsystem.Here, in an advantageous embodiment for a variable Heizbarkeit the compressed air preheater be switched on a temperature control and before the supply of the amine in liquid form in the heater and mixing stage of the flow of the liquid amine container with the flow meter via a switching temporarily to a return line be switched to the reservoir for pressure equalization in the flow system.
Eine beispielsweise Ausführungsform des Erfindungsgegenstandes ist nachfolgend anhand der Zeichnung, welche im Blockschema die erfindungsgemässe Einrichtung zum Aushärten von Giesserei-Kernen zeigt, näher erläutert.An exemplary embodiment of the subject invention is explained in more detail below with reference to the drawing, which shows the inventive device for curing foundry cores in block diagram.
Die gezeigte, an ein Kern-Formwerkzeug 20 einer nicht näher gezeigten Kern-Schiessmaschine anschliessbare Einrichtung zum Aushärten von Giesserei-Kernen aus einem Sand enthaltenden Formstoff, umfasst zunächst eine mit dem Kern-Formwerkzeug 20 gasdicht ankoppelbare Begasungsplatte oder -haube 30 mit einer vorgeschalteten Erhitzer- und Mischstufe 17 zur Überführung des flüssigen Amins in seinen gasförmigen Zustand und zur Erzeugung eines der Begasung des Kernes dienenden Katalysatordampf-Trägergas-Gemisches, wie das nachfolgend noch näher erläutert wird.The shown, connectable to a
Erfindungsgemäss gelangt das Amin in flüssiger Form aus einem Vorratsbehälter 4 mittels Durchflussmesser 9 o. dgl. dosiert in die Erhitzer- und Mischstufe 17, wo es in seinen gasförmigen Zustand überführt wird. Die Erhitzer- und Mischstufe 17 steht zudem mit einer Druckluftquelle 21 über einen proportionalen Druckregler 1 und einen Vorerhitzer 16 sowie Umschaltventilmittel 3 in Strömungsverbindung, um für eine zeitgesteuerte Begasung erhitzte Druckluft innerhalb einer vorgegebenen Zeit durch die mit dem Amingas belasteten Erhitzer- und Mischstufe 17 hindurchzuführen, welche Erhitzer- und Mischstufe 17 über eine durch ein Ventil 11 verschliessbare und vorzugsweise beheitzbare Leitung 15 mit dem Kern-Formwerkzeug 20 resp. der Begasungsplatte 30 verbunden ist, um das Katalysatordampf-Trägergas-Gemisch durch den sandhaltigen Formstoff im Kern-Formwerkzeug 20 hindurchzuleiten, wobei für eine zeitgesteuerte Spülung mit der erhitzten Druckluft die Druckluftquelle 21 über die Umschaltventilmittel 3 und gegebenenfalls einem Nacherhitzer 18 und einem Sperrventil 12 mit dem Kern-Formwerkzeug 20 resp. der Begasungsplatte 30 in Strömungsverbindung steht.According to the invention, the amine passes in liquid form from a reservoir 4 by means of flow meter 9 o. The like. Dosed into the heater and mixing
Hierbei ist für eine variable Erhitzbarkeit der Druckluft dem Vorerhitzer 16 eine Temperatursteuerung 22 zugeschaltet. Ähnlich sind auch der Erhitzer- und Mischstufe 17 eine Temperatursteuerung 23 und dem Nacherhitzer 18 eine Temperatursteuerung 24 zugeschaltet.Here, a
Vor der Zuführung des Amins in flüssiger Form in die Erhitzer- und Mischstufe 17 ist der Vorlauf 25 mit Absperrventil 5, Filter 6, Steuerventil 7, Pumpe 8 und Durchflussmesser 9 des Flüssig-Amin-Behälters 4 über ein Umschaltventil 10 temporär auf eine Rücklaufleitung 26 zum Vorlagebehälter 4 umschaltbar zum Druckausgleich im Vorlaufsystem.Before the supply of the amine in liquid form in the heating and mixing
Ferner ist die Begasungsplatte 30 mit einem Entlüftungsventil 13 versehen.Furthermore, the
Der heutigen Technik entsprechend sind dabei die betreffenden Umschaltungen und Steuerungen über eine Steuerschaltung 14 programmsteuerbar.In accordance with today's technology, the respective switches and controls are programmably controllable via a
Somit ist es nunmehr möglich, dass das Amin in flüssiger Form dosiert einer Erhitzer- und Mischstufe zugeführt und dort in seinen gasförmigen Zustand überführt wird; dass dann, nach gasdichter Ankopplung der Begasungsplatte, für eine zeitgesteuerte Begasung erhitzte Druckluft innerhalb einer vorgegebenen Zeit und unter proportionalem Druckanstieg durch die mit dem Amingas belasteten Erhitzer- und Mischstufe hindurchgeführt und von dort als Katalysatordampf-Trägergas-Gemisch durch den sandhaltigen Formstoff im Kern-Formwerkzeug hindurchgeleitet wird; und dass dann für eine zeitgesteuerte Spülung erhitzte Druckluft innerhalb einer vorgegebenen Zeit durch den begasten sandhaltigen Formstoff im Kern-Formwerkzeug hindurchgeleitet wird. Ferner ist es nunmehr möglich, die Druckluft für eine Begasung mit steigender Erhitzung des Katalysatordampf-Trägergas-Gemisches variabel zu erhitzen, um eine sogenannte Konturenhärtung zu erreichen. Ferner kann die als Spülluft dienende Druckluft zusätzlich erhitzt und weiter vor der Zuführung des Amins in flüssiger Form in die Erhitzer- und Mischstufe im Vorlauf Druckausgleich hergestellt und das Katalysatordampf-Trägergas-Gemisch auf seinem Weg zum Kern-Formwerkzeug wärmebegleitet werden.Thus, it is now possible that the amine metered in liquid form supplied to a heating and mixing stage and is converted there into its gaseous state; that then, after gas-tight coupling of the gassing plate, for a timed gassing heated compressed air within a given time and under proportional pressure increase passed through the loaded with the Amingas heater and mixing stage and from there as a catalyst vapor carrier gas mixture through the sand-containing molding material in the core mold is passed through; and that then for a time-controlled flushing heated compressed air is passed within a predetermined time by the fumigated sand-containing molding material in the core mold. Furthermore, it is now possible to variably heat the compressed air for a gassing with increasing heating of the catalyst vapor-carrier gas mixture in order to achieve a so-called contour hardening. Furthermore, the compressed air used as purging air can be additionally heated and further prepared before the supply of the amine in liquid form in the heating and mixing stage in the flow pressure equalization and the catalyst vapor carrier gas mixture are heat-accompanied on its way to the core mold.
Durch diese erfindungsgemässen Vorkehrungen lässt sich nunmehr eine wesentlich verkürzte Begasungs- und Spülzeit bei einem Minimum an notwendigem Amin gewährleisten.By means of these provisions according to the invention, it is now possible to ensure a significantly shortened gassing and rinsing time with a minimum of necessary amine.
Claims (8)
- A method of hardening foundry cores of sand-containing mold compositions, in which the core for its hardening in a core-shaping tool is treated with a catalyst vapor/carrier gas mixture by a gas supply plate which can be coupled hermetically to the core-shaping tool and then with a compressed air stream, each with predetermined pressure and predetermined temperature, characterized in that, preferably during the core shoot, the amine is fed in a liquid form and metered into a heating and mixing stage and there transformed into its gaseous state;
that then, after gas-tight coupling of the gas supply plate, for a controlled duration gas treatment, heated compressed air within a predetermined time and with proportional pressure increase is passed through the amine gas charged heating and mixing stage and from there as a catalyst-vapor/carrier-gas mixture is passed through the sand-containing mold composition in the core-shaping tool; and
that then for a controlled duration flushing, heated compressed air within a predetermined time is conducted through the gas-treated sand-containing mold composition in the core-shaping tool by a separate feed line. - The method according to claim 1, characterized in that the compressed air for the gas treatment is variably heatable with increasing heating of the catalyst vapor/carrier gas mixture.
- The method according to claim 1, characterized in that the compressed air serving as flushing air is additionally heatable.
- The method according to claim 1, characterized in that before the amine is fed in liquid form into the heating and mixing stage, a pressure equalization is carried out in the first run.
- The method according to claim 1, characterized in that the catalyst-vapor/carrier-gas mixture is accompanied by heat on its way to the core-shaping tool.
- A device for carrying out the method according to claim 1 for the heating of foundry cores of sand-containing mold composition in which the core for hardening in a core-shaping tool (20) is subjected to treatment with a catalyst-vapor/carrier-gas mixture through a gas supply plate (30) or the like which can be coupled hermetically to the core shaping tool and thereafter with a compressed air stream, each with predetermined pressure and predetermined temperature characterized in that the amine passes in liquid form from a supply vessel by means of a flow meter (9) or the like in a dosed form into a heating and mixing stage (17) and there is transformed into its gaseous state, which heating and mixing stage (17) is in a flow connection with a compressed air source (21) over a proportional pressure controller (1) and a preheater (16) as well as a switchover valve (3) for the controlled duration gas treatment whereby heated compressed air within a predetermined time and under proportional pressure increase is passed through the amine gas charged heating and mixing state (17), which heating and mixing stage (17) is connected by a duct (15) which can be closed by a valve (11) with the core-shaping tool (20) for the gas supply plate (30) to conduct the catalyst-vapor/carrier-gas mixture through the sand-containing mold composition in the core-shaping tool (20), whereby for the controlled duration flushing with the heated compressed air, the compressed air source (21) is in a flow connection with the core-shaping tool (20) or the gas supply plate (30) through the switchover valve (3) and optionally with an after-heater (18) and a blocking valve (12).
- The device according to claim 6, characterized in that for a variable heatability of the compressed air, the preheater (16) is associated with a temperature controller (22).
- The device according to claim 6, characterized in that before the amine is fed in a liquid form into the heating and mixing stage (17), the first run (25) of the liquid amine vessel (4) is temporarily supplied to a recycle line (26) to the supply vessel (4) for pressure equalization in the first run system via the flow meter (9) and the switchover valve (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH10342002 | 2002-06-17 | ||
| CH01034/02A CH695547A5 (en) | 2002-06-17 | 2002-06-17 | Method and apparatus for hardening foundry cores. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1375031A1 EP1375031A1 (en) | 2004-01-02 |
| EP1375031B1 true EP1375031B1 (en) | 2006-06-28 |
Family
ID=29716489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02024017A Expired - Lifetime EP1375031B1 (en) | 2002-06-17 | 2002-10-28 | Method and device for hardening foundry cores |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US7036552B2 (en) |
| EP (1) | EP1375031B1 (en) |
| CN (1) | CN1283389C (en) |
| AT (1) | ATE331576T1 (en) |
| CH (1) | CH695547A5 (en) |
| DE (1) | DE50207380D1 (en) |
| ES (1) | ES2267924T3 (en) |
| WO (1) | WO2003106072A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2848332A1 (en) | 2013-09-11 | 2015-03-18 | Lüber GmbH | Device and method for hardening foundry cores |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH698743B1 (en) * | 2006-04-24 | 2009-10-15 | Lueber Gmbh | Method and apparatus for curing inorganic foundry cores and shapes. |
| CN102527932B (en) * | 2010-12-28 | 2014-05-07 | 苏州明志科技有限公司 | Curing device of resin molding sand for casting |
| ES2613594T3 (en) * | 2011-07-19 | 2017-05-24 | Ask Chemicals L. P. | Method for curing a cold box casting profile with a gaseous catalyst |
| CN102430723B (en) * | 2011-12-26 | 2013-04-24 | 冯新林 | Triethylamine gas producing and recycling system |
| CN103521708A (en) * | 2013-08-16 | 2014-01-22 | 苏州明志科技有限公司 | Quantitative control method and device for gas generator catalyst for cold-box core blower |
| DE102018120993A1 (en) * | 2018-08-28 | 2020-03-05 | Fritz Winter Eisengiesserei Gmbh & Co. Kg | Process for the gassing of molding material injected into a core box for the production of casting cores with a catalyst gas |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4132260A (en) * | 1975-10-02 | 1979-01-02 | Werner Luber | Method and apparatus for hardening of foundry cores |
| CH603276A5 (en) * | 1975-10-02 | 1978-08-15 | Werner Lueber | |
| US4362204A (en) * | 1980-03-17 | 1982-12-07 | The Mead Corporation | Method and apparatus for curing a foundry core |
| US4483384A (en) * | 1980-06-02 | 1984-11-20 | Michel Horst Werner | Apparatus for hardening mold parts made of sand for making metal castings |
| US4467855A (en) * | 1981-11-12 | 1984-08-28 | Sintokogio Ltd. | Method of making mold |
| CH670405A5 (en) * | 1985-12-19 | 1989-06-15 | Werner Lueber | |
| US5971056A (en) * | 1997-05-27 | 1999-10-26 | Luger GmbH | Device for hardening foundry cores and use thereof |
| WO1999043456A2 (en) * | 1998-02-10 | 1999-09-02 | Dean Anthony Jones | Heater for gaseous substances and core production with such a heater |
-
2002
- 2002-06-17 CH CH01034/02A patent/CH695547A5/en not_active IP Right Cessation
- 2002-10-28 DE DE50207380T patent/DE50207380D1/en not_active Expired - Lifetime
- 2002-10-28 AT AT02024017T patent/ATE331576T1/en not_active IP Right Cessation
- 2002-10-28 ES ES02024017T patent/ES2267924T3/en not_active Expired - Lifetime
- 2002-10-28 EP EP02024017A patent/EP1375031B1/en not_active Expired - Lifetime
-
2003
- 2003-06-11 CN CNB038017822A patent/CN1283389C/en not_active Expired - Fee Related
- 2003-06-11 WO PCT/CH2003/000368 patent/WO2003106072A1/en active Application Filing
- 2003-06-11 US US10/498,676 patent/US7036552B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2848332A1 (en) | 2013-09-11 | 2015-03-18 | Lüber GmbH | Device and method for hardening foundry cores |
| WO2015036184A1 (en) * | 2013-09-11 | 2015-03-19 | Lüber GmbH | Device and method for hardening foundry cores |
| US9630241B2 (en) | 2013-09-11 | 2017-04-25 | Lüber GmbH | Device and method for hardening foundry cores |
Also Published As
| Publication number | Publication date |
|---|---|
| CH695547A5 (en) | 2006-06-30 |
| EP1375031A1 (en) | 2004-01-02 |
| US7036552B2 (en) | 2006-05-02 |
| ATE331576T1 (en) | 2006-07-15 |
| DE50207380D1 (en) | 2006-08-10 |
| WO2003106072A1 (en) | 2003-12-24 |
| CN1283389C (en) | 2006-11-08 |
| US20050077023A1 (en) | 2005-04-14 |
| ES2267924T3 (en) | 2007-03-16 |
| CN1606478A (en) | 2005-04-13 |
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