EP1053806B1 - Apparatus for coating cores with an aqueous coating - Google Patents

Apparatus for coating cores with an aqueous coating Download PDF

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Publication number
EP1053806B1
EP1053806B1 EP00401273A EP00401273A EP1053806B1 EP 1053806 B1 EP1053806 B1 EP 1053806B1 EP 00401273 A EP00401273 A EP 00401273A EP 00401273 A EP00401273 A EP 00401273A EP 1053806 B1 EP1053806 B1 EP 1053806B1
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EP
European Patent Office
Prior art keywords
bath
coating
delivering
water
level
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EP00401273A
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German (de)
French (fr)
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EP1053806B8 (en
EP1053806A1 (en
Inventor
Patrick Beauvais
Lionel Choplin
Volkmar Neubert
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Institut fur Materialpruefung und Werkstofftechni
Centre Technique des Industries de la Fonderie
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Centre Technique des Industries de la Fonderie
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Publication of EP1053806B8 publication Critical patent/EP1053806B8/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding
    • B22C23/02—Devices for coating moulds or cores

Definitions

  • the invention relates to an installation for coating cores of foundry with an aqueous coating, of the type comprising a tank intended for contain an aqueous plaster bath and equipped with an agitator of said bath and means for evacuating said bath, means for bringing a core of foundry to be coated above said bath, soaking it in said bath, reassemble it after soaking and evacuate it, and a control device said means.
  • the object of the invention is to propose an installation coating of cores as defined in the introduction which allows guarantee a constant quality of the layer coating the core after hardening according to the characteristics of the core to be coated and the type of aqueous plaster used, ensuring uniformity of thickness, the absence of drips and the absence of drops.
  • This object is achieved according to the invention using means allowing continuously measure the rheological properties of the plaster contained in the tank and means for regulating by supply water and / or pasty coating the rheological properties of the coating of the bath.
  • the calculation means thus make it possible to maintain the viscosity and the bath level in ranges as narrow as you want.
  • the control device ensures the movement sequences of the core to be treated according to a predetermined timing, function of characteristics of the core and the coating used in order, in particular, to avoid drips or drops during the ascent of the nucleus.
  • the tank is equipped with preferably a temperature probe to measure the temperature of the bath and heating means capable of maintaining the bath temperature within a specified temperature range, the probe of temperature delivering signals representative of the temperature measured at an automaton capable of acting on the heating means.
  • These heating means advantageously include a circuit pump equipped with a circulation pump and an electric radiator controlled by the PLC.
  • the means for measuring the level of the bath include, preferably a contactless type device installed above the tank.
  • the calculation unit is linked to the control unit in order to allow adjustment of the depth of the core quench as a function level measurement.
  • Figures 1 and 2 schematically show an installation coating of foundry cores 1 which is immersed in a bath 2 of an aqueous coating contained in a tank 3, using a device 4 which allows to bring the nucleus to be treated above the tank 3, the immerse in bath 2, reassemble it after soaking, then evacuate it to a drying station.
  • the device 4 comprises a carriage 5 capable of moving on rails 6 between a station 7 for the arrival and removal of cores and the above the tank 3, this carriage 5 supporting a gripping grapple 8 cores 1, vertically movable.
  • the carriage 5 is moves perpendicular to the rails 6, on a mobile support on the rails 6.
  • the carriage 5 and the grapple 8 are actuated by motors Sa and 8a controlled by a control device 9 which ensures the displacement of the core 1 during an operating cycle according to a predetermined timing which is a function of the characteristics of the cores to be treated and the type of plaster used.
  • the descent speeds of the core 1 in the tank and rising of the core 1 are in particular calculated so as to avoid drips and drops on the core coating and ensuring the uniformity of the thickness of the coating layer.
  • Post 7 for the arrival and removal of cores has a turntable 10 whose rotation is controlled by the device command 9.
  • the bottom of the tank 3 is equipped with an agitator 11 driven by a motor 12.
  • the shape and dimensions of the agitator 11 are chosen to guarantee homogeneity of the suspension hold of the bath 2 plaster in the tank 3.
  • the tank 3 is equipped with a rheometer 13 allowing a circulation of the coating between the internal wall of the tank 3 and the measuring and supplying electrical signals representative of the measurement of the viscosity of the bath 2.
  • a sensor 14 for measuring the level of the bath 2 in the tank 3. This sensor 14, without contact with the bath, is of the ultrasonic, radar or optical type and provides electrical signals representative of the level value of the bath 2.
  • the tank 3 is further equipped with a temperature probe 15 to measure the temperature of bath 2. This probe 15 provides also electrical signals representative of the measurement of temperature. Evacuation means 16 from the bath 2 are provided at the bottom of the tank 3.
  • the rheometer 13 and the level sensor 14 are connected to a member calculation 17 used to regulate, by adding water and / or pasty coating primary, the rheological properties of bath 2 and to regulate the level of bath 2 in tank 3 due to the consumption of plaster.
  • the temperature probe 15 is connected to the same calculation member 17 or to an independent machine to allow the bath to be maintained 2 within a given temperature range.
  • the calculation unit 17 can obviously be common to or linked to the calculation unit associated with the control device 9 so that this the latter can take bath level 2 into account.
  • Means 20 are provided to allow a supply of water and / or of primary coating in the tank 3 when the viscosity of the bath 2 is found outside of a predetermined viscosity range.
  • a static mixer 21 is connected to a water source 22 by a duct 23 on which a water softener 24 is mounted in series, a manual shut-off valve 25, an electric valve 26 which is under the control of the calculation unit 17, a pressure regulating valve 27 and a non-return valve 28, and to a reserve 30 of primary pasty coating by a conduit 31 on which are mounted in series a pump 32 actuated by a motor controlled by the calculating member 17 and a stop valve 33.
  • the static mixer 21 is connected to the tank 3 by a plaster delivery pipe 34.
  • the opening of the electric valve 26 by the calculating member 17 causes a supply of water in the tank. Setting en route of the pump 32 by the calculating member 17 allows a contribution pasty coating in the tank 3.
  • the tank 3 has a double wall which delimits a chamber waterproof 40 connected to an external circuit 41 on which are mounted series a circulation pump 42, an electric radiator 43 controlled by the calculating member 17, and a pressure regulating valve 44.
  • the chamber 40 and circuit 41 contain water heated by the radiator 43 and used to maintain the bath 2 at a temperature substantially constant.
  • the external circuit 41 is connected to the source of water 22 downstream of the circulation pump by means of a gate valve three-way 45 and has a second three-way valve 46, these valves 45 and 46 allowing the emptying of the circuit 41 or the filling of this heating water circuit.
  • the computing unit 17, which is for example an automaton programmable, includes a sequence of instructions allowing the reading of the electrical signals supplied by the rheometer 13, the sensor 14 level, and the operation of the delivery pump 32 plaster, electric valve 26 for water supply, means discharge 16 as a function of the viscosity measurement and the measurement level.
  • Figure 3 shows the flow chart of the instruction sequence.
  • the calculation unit 17 activates, the pump 32 (instruction 105) and the electric valve 26 (instruction 104) for a period depending on the volume of coating missing in the tank, then activates the agitator 11 for a predetermined duration (instruction 106).
  • the calculation unit 17 stops the evacuation means 16 (instruction 107), then measures the viscosity V of the bath 2 (instruction 108).
  • the calculation unit 17 operates the pump 32 (instruction 110) for a calculated duration, then activates the agitator 11 for a given duration (instruction 111).
  • V max a maximum value (instruction 112)
  • the calculation unit 17 operates the valve 26 (instruction 113) and the agitator 11 (instruction 114).
  • the calculating member 17 allows the device to command 9 to immerse a core 1 in the bath 2 (instruction 115).
  • the value of level H can be transmitted to the device for command 9 so that the latter can adjust the height of the dip.
  • the viscosity value V can also be transmitted to the control 9 so that the latter can adjust the quenching speeds and go back up in order to avoid drips or drops on the core 1 treated in the cycle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paints Or Removers (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Coating Apparatus (AREA)
  • Mold Materials And Core Materials (AREA)
  • Cultivation Of Seaweed (AREA)
  • Casting Devices For Molds (AREA)

Abstract

An installation for the coating of foundry cores by soaking in a bath (2) of an aqueous coating contained in a tank (3). A rheometer (13) measures the viscosity of the bath (2) and a level sensor (14) measures the level of the bath (2). A computer (17 allows the regulation of the rheological properties of the bath (2) by supplying water and/or the coating paste. A static mixer connected to a reservoir (30) of primary coating and to a source of water delivering the supply of water and/or coating paste in the tank (3). The tank (3) is also equipped with a circuit for regulating the temperature of the bath (2).

Description

L'invention concerne une installation d'enduisage de noyaux de fonderie avec un enduit aqueux, du type comportant une cuve destinée à contenir un bain d'enduit aqueux et équipée d'un agitateur dudit bain et de moyens d'évacuation dudit bain, des moyens pour amener un noyau de fonderie à enduire au-dessus dudit bain, le tremper dans ledit bain, le remonter après trempage et l'évacuer, et un dispositif de commande desdits moyens.The invention relates to an installation for coating cores of foundry with an aqueous coating, of the type comprising a tank intended for contain an aqueous plaster bath and equipped with an agitator of said bath and means for evacuating said bath, means for bringing a core of foundry to be coated above said bath, soaking it in said bath, reassemble it after soaking and evacuate it, and a control device said means.

Il est connu de l'homme du métier que l'utilisation d'enduits sur des noyaux ou des moules de fonderie permet d'améliorer la résistance thermique du moule ou du noyau, d'assurer la qualité de la pièce moulée et de contribuer à la qualité de la peau de la pièce issue du moulage. L'enduction permet ainsi de diminuer le taux de rebut et d'améliorer l'état de surface des pièces coulées. La présence de défauts dus aux interactions sable-métal accroít de manière sensible les coûts des opérations de finissage, en l'absence d'enduction, et ne répond pas aux exigences des clients des fonderies.It is known to those skilled in the art that the use of coatings on foundry cores or molds improves strength mold or core thermal, to ensure the quality of the part molded and contribute to the quality of the skin of the piece molding. The coating thus reduces the scrap rate and improve the surface condition of the cast parts. The presence of faults due to sand-metal interactions significantly increase costs finishing operations, in the absence of coating, and does not respond to the requirements of foundry customers.

Actuellement, la plupart des enduits utilisés sont à base d'alcool, et les procédés d'enduction entraínent des émanations de composés organiques volatils préjudiciables à l'environnement. C'est pourquoi on essaye de plus en plus de remplacer les enduits à base d'alcool par des enduits à base aqueuse.Currently, most of the coatings used are alcohol-based, and coating processes result in fumes of compounds volatile organic materials harmful to the environment. That's why we is increasingly trying to replace alcohol-based coatings with water-based coatings.

Mais les enduits à base aqueuse sont plus difficiles à mettre en oeuvre, notamment pour l'enduisage des noyaux, et il n'existe pas, à l'heure actuelle, de moyens de contrôle et de régulation qui permettent de garantir en temps réel et d'une manière automatique la maítrise du procédé d'enduction dans une installation d'enduisage de noyaux.But water-based coatings are more difficult to apply work, in particular for coating the cores, and there is no such thing the present day, means of control and regulation which allow to guarantee in real time and automatically the control of the coating process in a core coating plant.

L'invention s'est donné pour but de proposer une installation d'enduisage de noyaux telle que définie en introduction qui permette de garantir une qualité constante de la couche revêtant le noyau après trempage en fonction des caractéristiques du noyau à enduire et du type d'enduit aqueux utilisé, en assurant l'homogénéité de l'épaisseur, l'absence de coulures et l'absence de gouttes.The object of the invention is to propose an installation coating of cores as defined in the introduction which allows guarantee a constant quality of the layer coating the core after hardening according to the characteristics of the core to be coated and the type of aqueous plaster used, ensuring uniformity of thickness, the absence of drips and the absence of drops.

Ce but est atteint selon l'invention à l'aide de moyens permettant de mesurer en permanence les propriétés rhéologiques de l'enduit contenu dans la cuve et des moyens permettant de réguler par apport d'eau et/ou d'enduit pâteux les propriétés rhéologiques de l'enduit du bain.This object is achieved according to the invention using means allowing continuously measure the rheological properties of the plaster contained in the tank and means for regulating by supply water and / or pasty coating the rheological properties of the coating of the bath.

L'installation selon l'invention est donc caractérisée par le fait qu'elle comporte en outre :

  • des moyens de mesure de la viscosité dudit bain, susceptibles de fournir des signaux représentatifs de la viscosité,
  • des moyens de mesure du niveau dudit bain, susceptibles de fournir des signaux représentatifs du niveau,
  • un mélangeur statique relié à une réserve d'enduit primaire et à une source d'eau et susceptible de délivrer de l'enduit aqueux dans ladite cuve,
  • des moyens de délivrance d'un débit d'enduit primaire de ladite réserve vers ledit mélangeur statique,
  • des moyens de délivrance d'un débit d'eau de ladite source d'eau vers ledit mélangeur statique, et
  • des moyens de calcul reliés auxdits moyens de délivrance d'un débit d'enduit primaire, auxdits moyens de délivrance d'un débit d'eau et auxdits moyens d'évacuation, et recevant en permanence les signaux fournis par lesdits moyens de mesure de la viscosité et lesdits moyens de mesure du niveau, lesdits moyens de calcul étant susceptibles de mettre en fonction
  • lesdits moyens de délivrance d'un débit d'enduit primaire lorsque la viscosité mesurée est inférieure à une valeur minimale donnée,
  • lesdits moyens de délivrance d'un débit d'eau lorsque la viscosité mesurée est supérieure à une valeur maximale donnée,
  • lesdits moyens de délivrance d'un débit d'enduit et lesdits moyens de délivrance d'un débit d'eau lorsque le niveau mesuré est inférieur à une valeur minimale donnée, et
  • lesdits moyens d'évacuation lorsque le niveau mesuré est supérieur à une valeur maximale donnée.
The installation according to the invention is therefore characterized by the fact that it further comprises:
  • means for measuring the viscosity of said bath, capable of supplying signals representative of the viscosity,
  • means for measuring the level of said bath, capable of supplying signals representative of the level,
  • a static mixer connected to a reserve of primary coating and to a source of water and capable of delivering aqueous coating into said tank,
  • means for delivering a flow of primary coating from said reserve to said static mixer,
  • means for delivering a flow of water from said water source to said static mixer, and
  • calculation means connected to said means for delivering a flow rate of primary coating, to said means for delivering a water flow rate and to said discharge means, and permanently receiving the signals supplied by said means for measuring the viscosity and said level measurement means, said calculation means being capable of putting into operation
  • said means for delivering a primary coating flow when the viscosity measured is less than a given minimum value,
  • said means for delivering a water flow when the viscosity measured is greater than a given maximum value,
  • said means for delivering a coating flow and said means for delivering a water flow when the measured level is less than a given minimum value, and
  • said evacuation means when the measured level is greater than a given maximum value.

Les moyens de calcul permettent ainsi de maintenir la viscosité et le niveau du bain dans des plages de valeurs aussi étroites que l'on veut. Le dispositif de commande assure les séquences de déplacement du noyau à traiter selon un cadencement prédéterminé, fonction des caractéristiques du noyau et de l'enduit utilisé afin, notamment, d'éviter des coulures ou des gouttes lors de la remontée du noyau.The calculation means thus make it possible to maintain the viscosity and the bath level in ranges as narrow as you want. The control device ensures the movement sequences of the core to be treated according to a predetermined timing, function of characteristics of the core and the coating used in order, in particular, to avoid drips or drops during the ascent of the nucleus.

Les caractéristiques rhéologiques d'un enduit aqueux variant sensiblement en fonction de la température, la cuve est équipée, de préférence, d'une sonde de température pour mesurer la température du bain et de moyens de chauffage susceptibles de maintenir la température du bain dans une plage de température déterminée, la sonde de température délivrant des signaux représentatifs de la température mesurée à un automate susceptible d'agir sur les moyens de chauffage.The rheological characteristics of a varying aqueous coating depending on the temperature, the tank is equipped with preferably a temperature probe to measure the temperature of the bath and heating means capable of maintaining the bath temperature within a specified temperature range, the probe of temperature delivering signals representative of the temperature measured at an automaton capable of acting on the heating means.

Ces moyens de chauffage comportent avantageusement un circuit à eau équipé d'une pompe de circulation et d'un radiateur électrique commandés par l'automate.These heating means advantageously include a circuit pump equipped with a circulation pump and an electric radiator controlled by the PLC.

Les moyens de mesure du niveau du bain comportent, de préférence, un dispositif de type sans contact installé au-dessus de la cuve.The means for measuring the level of the bath include, preferably a contactless type device installed above the tank.

L'organe de calcul est relié à l'organe de commande afin de permettre le réglage de la profondeur du trempé du noyau en fonction de la mesure du niveau.The calculation unit is linked to the control unit in order to allow adjustment of the depth of the core quench as a function level measurement.

D'autres avantages et caractéristiques de l'invention ressortiront à la lecture de la description suivante faite à titre d'exemple et en référence aux dessins annexés dans lesquels :

  • la figure 1 est un schéma de principe d'une partie de l'installation selon l'invention, qui montre la cuve contenant le bain, les circuits d'apport d'eau et d'enduit primaire, le circuit de réchauffage du bain, et les moyens de contrôle et de régulation de l'ensemble ;
  • la figure 2 est une vue latérale de l'installation qui montre plus précisément les moyens de manutention d'un noyau à traiter ; et
  • la figure 3 montre les séquences d'instructions du programme de gestion des moyens de contrôle et de régulation de l'installation.
    • Other advantages and characteristics of the invention will emerge on reading the following description given by way of example and with reference to the appended drawings in which:
  • FIG. 1 is a block diagram of part of the installation according to the invention, which shows the tank containing the bath, the water supply and primary coating circuits, the bath heating circuit, and the means of control and regulation of the whole;
  • FIG. 2 is a side view of the installation which shows more precisely the means for handling a core to be treated; and
  • FIG. 3 shows the instruction sequences of the program for managing the installation's control and regulation means.

    • Les figures 1 et 2 montrent schématiquement une installation d'enduisage de noyaux de fonderie 1 que l'on plonge dans un bain 2 d'un enduit aqueux contenu dans une cuve 3, à l'aide d'un dispositif 4 qui permet d'amener le noyau à traiter au-dessus de la cuve 3, le plonger dans le bain 2, le remonter après trempage, puis l'évacuer vers un poste de séchage. Figures 1 and 2 schematically show an installation coating of foundry cores 1 which is immersed in a bath 2 of an aqueous coating contained in a tank 3, using a device 4 which allows to bring the nucleus to be treated above the tank 3, the immerse in bath 2, reassemble it after soaking, then evacuate it to a drying station.

    Le dispositif 4 comporte un chariot 5 susceptible de se déplacer sur des rails 6 entre un poste 7 d'arrivée et d'évacuation de noyaux et le dessus de la cuve 3, ce chariot 5 supportant un grappin 8 de préhension des noyaux 1, mobile verticalement. De préférence, le chariot 5 se déplace perpendiculièrement aux rails 6, sur un support mobile sur les rails 6. Le chariot 5 et le grappin 8 sont actionnés par des moteurs Sa et 8a commandés par un dispositif de commande 9 qui assure le déplacement du noyau 1 au cours d'un cycle de fonctionnement selon un cadencement prédéterminé qui est fonction des caractéristiques des noyaux à traiter et du type d'enduit utilisé. Les vitesses de descente du noyau 1 dans la cuve et de remontée du noyau 1 sont notamment calculées de manière à éviter des coulures et des gouttes sur le noyau enduit et à assurer l'homogénéité de l'épaisseur de la couche d'enduit.The device 4 comprises a carriage 5 capable of moving on rails 6 between a station 7 for the arrival and removal of cores and the above the tank 3, this carriage 5 supporting a gripping grapple 8 cores 1, vertically movable. Preferably, the carriage 5 is moves perpendicular to the rails 6, on a mobile support on the rails 6. The carriage 5 and the grapple 8 are actuated by motors Sa and 8a controlled by a control device 9 which ensures the displacement of the core 1 during an operating cycle according to a predetermined timing which is a function of the characteristics of the cores to be treated and the type of plaster used. The descent speeds of the core 1 in the tank and rising of the core 1 are in particular calculated so as to avoid drips and drops on the core coating and ensuring the uniformity of the thickness of the coating layer.

    Ces vitesses peuvent être calculées par un organe de calcul associé au dispositif de commande 9 en fonction de valeurs de consigne dépendant du type de noyau 1 à traiter et du type d'enduit aqueux utilisé.These speeds can be calculated by a calculation unit associated with the control device 9 as a function of set values depending on the type of core 1 to be treated and the type of aqueous coating used.

    Le poste 7 d'arrivée et d'évacuation des noyaux comporte une table tournante 10 dont la rotation est commandée par le dispositif de commande 9.Post 7 for the arrival and removal of cores has a turntable 10 whose rotation is controlled by the device command 9.

    Le fond de la cuve 3 est équipé d'un agitateur 11 entraíné par un moteur 12. La forme et les dimensions de l'agitateur 11 sont choisies pour garantir une homogénéité de la tenue en suspension du bain 2 d'enduit dans la cuve 3.The bottom of the tank 3 is equipped with an agitator 11 driven by a motor 12. The shape and dimensions of the agitator 11 are chosen to guarantee homogeneity of the suspension hold of the bath 2 plaster in the tank 3.

    La cuve 3 est équipée d'un rhéomètre 13 permettant une circulation de l'enduit entre la paroi interne de la cuve 3 et le système de mesure et fournissant des signaux électriques représentatifs de la mesure de la viscosité du bain 2. Au-dessus de la cuve 3 est monté un capteur 14 pour mesurer le niveau du bain 2 dans la cuve 3. Ce capteur 14, sans contact avec le bain, est du type ultrasons, radar ou optique et fournit des signaux électriques représentatifs de la valeur du niveau du bain 2.The tank 3 is equipped with a rheometer 13 allowing a circulation of the coating between the internal wall of the tank 3 and the measuring and supplying electrical signals representative of the measurement of the viscosity of the bath 2. Above the tank 3 is mounted a sensor 14 for measuring the level of the bath 2 in the tank 3. This sensor 14, without contact with the bath, is of the ultrasonic, radar or optical type and provides electrical signals representative of the level value of the bath 2.

    La cuve 3 est en outre équipée d'une sonde de température 15 pour mesurer la température du bain 2. Cette sonde 15 fournit également des signaux électriques représentatifs de la mesure de température. Des moyens d'évacuation 16 du bain 2 sont prévus au fond de la cuve 3.The tank 3 is further equipped with a temperature probe 15 to measure the temperature of bath 2. This probe 15 provides also electrical signals representative of the measurement of temperature. Evacuation means 16 from the bath 2 are provided at the bottom of the tank 3.

    Le rhéomètre 13 et le capteur de niveau 14 sont reliés à un organe de calcul 17 servant à réguler, par apport d'eau et/ou d'enduit pâteux primaire, les propriétés rhéologiques du bain 2 et à réguler le niveau du bain 2 dans la cuve 3 par suite de la consommation d'enduit.The rheometer 13 and the level sensor 14 are connected to a member calculation 17 used to regulate, by adding water and / or pasty coating primary, the rheological properties of bath 2 and to regulate the level of bath 2 in tank 3 due to the consumption of plaster.

    La sonde de température 15 est reliée au même organe de calcul 17 ou à un automate indépendant afin de permettre le maintien du bain 2 dans une plage de température donnée.The temperature probe 15 is connected to the same calculation member 17 or to an independent machine to allow the bath to be maintained 2 within a given temperature range.

    L'organe de calcul 17 peut évidemment être commun à ou relié à l'organe de calcul associé au dispositif de commande 9 afin que ce dernier puisse tenir compte du niveau du bain 2.The calculation unit 17 can obviously be common to or linked to the calculation unit associated with the control device 9 so that this the latter can take bath level 2 into account.

    Des moyens 20 sont prévus pour permettre un apport d'eau et/ou d'enduit primaire dans la cuve 3 lorsque la viscosité du bain 2 se trouve en dehors d'une plage de viscosité prédéterminée.Means 20 are provided to allow a supply of water and / or of primary coating in the tank 3 when the viscosity of the bath 2 is found outside of a predetermined viscosity range.

    Un mélangeur statique 21 est raccordé à une source d'eau 22 par un conduit 23 sur lequel sont montés en série un adoucisseur d'eau 24, une vanne d'arrêt manuel 25, une vanne 26 électrique qui est sous le contrôle de l'organe de calcul 17, une vanne 27 régulatrice de pression et un clapet anti retour 28, et à une réserve 30 d'enduit pâteux primaire par un conduit 31 sur lequel sont montées en série une pompe 32 actionnée par un moteur commandé par l'organe de calcul 17 et une vanne d'arrêt 33. Le mélangeur statique 21 est relié à la cuve 3 par un conduit de délivrance d'enduit 34. L'ouverture de la vanne électrique 26 par l'organe de calcul 17 entraíne un apport d'eau dans la cuve. La mise en route de la pompe 32 par l'organe de calcul 17 permet un apport d'enduit pâteux dans la cuve 3.A static mixer 21 is connected to a water source 22 by a duct 23 on which a water softener 24 is mounted in series, a manual shut-off valve 25, an electric valve 26 which is under the control of the calculation unit 17, a pressure regulating valve 27 and a non-return valve 28, and to a reserve 30 of primary pasty coating by a conduit 31 on which are mounted in series a pump 32 actuated by a motor controlled by the calculating member 17 and a stop valve 33. The static mixer 21 is connected to the tank 3 by a plaster delivery pipe 34. The opening of the electric valve 26 by the calculating member 17 causes a supply of water in the tank. Setting en route of the pump 32 by the calculating member 17 allows a contribution pasty coating in the tank 3.

    La cuve 3 comporte une double paroi qui délimite une chambre étanche 40 raccordée à un circuit externe 41 sur lequel sont montés en série une pompe de circulation 42, un radiateur électrique 43 commandé par l'organe de calcul 17, et une vanne 44 régulatrice de pression. La chambre 40 et le circuit 41 contiennent une eau réchauffée par le radiateur 43 et servant à maintenir le bain 2 à une température sensiblement constante. Le circuit externe 41 est raccordé à la source d'eau 22 en aval de la pompe de circulation au moyen d'une vanne à trois voies 45 et comporte une deuxième vanne à trois voies 46, ces vannes 45 et 46 permettant la vidange du circuit 41 ou le remplissage de ce circuit en eau de chauffage.The tank 3 has a double wall which delimits a chamber waterproof 40 connected to an external circuit 41 on which are mounted series a circulation pump 42, an electric radiator 43 controlled by the calculating member 17, and a pressure regulating valve 44. The chamber 40 and circuit 41 contain water heated by the radiator 43 and used to maintain the bath 2 at a temperature substantially constant. The external circuit 41 is connected to the source of water 22 downstream of the circulation pump by means of a gate valve three-way 45 and has a second three-way valve 46, these valves 45 and 46 allowing the emptying of the circuit 41 or the filling of this heating water circuit.

    L'organe de calcul 17, qui est par exemple un automate programmable, comporte une séquence d'instructions permettant la lecture des signaux électriques fournis par le rhéomètre 13, le capteur 14 de niveau, et la mise en fonction de la pompe 32 de délivrance d'enduit primaire, de la vanne électrique 26 d'apport d'eau, des moyens d'évacuation 16 en fonction de la mesure de la viscosité et de la mesure de niveau.The computing unit 17, which is for example an automaton programmable, includes a sequence of instructions allowing the reading of the electrical signals supplied by the rheometer 13, the sensor 14 level, and the operation of the delivery pump 32 plaster, electric valve 26 for water supply, means discharge 16 as a function of the viscosity measurement and the measurement level.

    La figure 3 montre l'ordinogramme de la séquence d'instructions.Figure 3 shows the flow chart of the instruction sequence.

    Lorsque la mesure du niveau H (instruction 101) est supérieure à une valeur maximale H max, l'organe de calcul met en fonction les moyens d'évacuation 16 (instruction 102).When the measurement of level H (instruction 101) is greater than a maximum value H max, the calculation unit puts the evacuation means 16 (instruction 102).

    Lorsque la mesure du niveau H (instruction 103) est inférieure à une valeur minimale H min, l'organe de calcul 17 met en fonction, la pompe 32 (instruction 105) et la vanne électrique 26 (instruction 104) pendant une durée fonction du volume d'enduit manquant dans la cuve, puis met en fonction l'agitateur 11 pendant une durée prédéterminée (instruction 106).When the level H measurement (instruction 103) is less than a minimum value H min, the calculation unit 17 activates, the pump 32 (instruction 105) and the electric valve 26 (instruction 104) for a period depending on the volume of coating missing in the tank, then activates the agitator 11 for a predetermined duration (instruction 106).

    Lorsque le niveau du bain est compris entre la valeur minimale (H min) et la valeur maximale (H max), l'organe de calcul 17 arrête les moyens d'évacuation 16 (instruction 107), puis mesure la viscosité V du bain 2 (instruction 108).When the bath level is between the minimum value (H min) and the maximum value (H max), the calculation unit 17 stops the evacuation means 16 (instruction 107), then measures the viscosity V of the bath 2 (instruction 108).

    Si la viscosité V est inférieure à une valeur minimale (V min) (instruction 109), l'organe de calcul 17 met en fonction la pompe 32 (instruction 110) pendant une durée calculée, puis met en fonction l'agitateur 11 pendant une durée donnée (instruction 111).If the viscosity V is less than a minimum value (V min) (instruction 109), the calculation unit 17 operates the pump 32 (instruction 110) for a calculated duration, then activates the agitator 11 for a given duration (instruction 111).

    Si la viscosité V est supérieure à une valeur maximale (V max) (instruction 112), l'organe de calcul 17 met en fonction la vanne électrique 26 (instruction 113) et l'agitateur 11 (instruction 114).If the viscosity V is greater than a maximum value (V max) (instruction 112), the calculation unit 17 operates the valve 26 (instruction 113) and the agitator 11 (instruction 114).

    Si la viscosité V est comprise entre la valeur minimale V min et la valeur maximale V max, l'organe de calcul 17 permet au dispositif de commande 9 de réaliser une immersion d'un noyau 1 dans le bain 2 (instruction 115).If the viscosity V is between the minimum value V min and the maximum value V max, the calculating member 17 allows the device to command 9 to immerse a core 1 in the bath 2 (instruction 115).

    La valeur du niveau H peut être transmise au dispositif de commande 9 afin que ce dernier puisse régler la hauteur du trempé. La valeur de la viscosité V peut être également transmise au dispositif de commande 9 afin que ce dernier puisse régler les vitesses de trempé et de remonter afin d'éviter des coulures ou des gouttes sur le noyau 1 traité dans le cycle.The value of level H can be transmitted to the device for command 9 so that the latter can adjust the height of the dip. The viscosity value V can also be transmitted to the control 9 so that the latter can adjust the quenching speeds and go back up in order to avoid drips or drops on the core 1 treated in the cycle.

    Claims (5)

    1. Installation for coating cores for casting with an aqueous coating, of the type having a tank (3) intended to contain a bath (2) of aqueous coating and equipped with an agitator (11) for said bath and means for emptying (16) said bath, means for bringing a core for casting, which is to be coated, above said bath, for dipping it in said bath, for raising it again after dipping and for removing it, and a control device for said means,
      characterised by the fact that it further comprises:
      means for measuring (13) the viscosity of said bath (2), which are capable of supplying signals representing viscosity,
      means for measuring (14) the level of said bath, capable of supplying signals representing the level,
      a static mixer (21) connected to a reserve (30) of primary coating and to a source of water (22) and capable of delivering the aqueous coating to said tank,
      means for delivering (32) of a flow of primary coating from said reserve (30) to said static mixer (21),
      means for delivering (26) a flow of water from said source of water (22) to said static mixer (21), and
      calculation means (17) connected to said means for delivering (32) a flow of primary coating, to said means for delivering (26) a flow of water and to said emptying means (16), and constantly receiving the signals supplied by said means for measuring (13) viscosity and said means for measuring (14) the level, said calculation means (17) being capable of starting up
      said means for delivering (32) a flow of primary coating when the measured viscosity is less than a given minimum value,
      said means for delivering (26) a flow of water when the measured viscosity is greater than a given maximum value,
      said means for delivering (32) a flow of coating and said means for delivering (26) a flow of water when the measured level is less than a given minimum value, and
      said emptying means (16) when the measured level is greater than a given maximum value.
    2. Installation according to Claim 1, characterised by the fact that the tank (3) is equipped with a temperature sensor (15) for measuring the temperature of the bath (2) and with heating means (43) capable of maintaining the temperature of the bath within a predetermined temperature range, the temperature sensor (15) delivering signals representing the measured temperature to an automaton capable of acting on the heating means (43).
    3. Installation according to Claim 2, characterised by the fact that the heating means (43) comprise a water circuit (41) equipped with a circulating pump (42) and an electric radiator (44) controlled by the automaton.
    4. Installation according to any one of Claims 1 to 3, characterised by the fact that the means for measuring (14) the level of the bath comprise a device of the contact-less type installed above the tank.
    5. Installation according to any one of Claims 1 to 4, characterised by the fact that the calculation body (17) is connected to the control body so as to allow the depth of dipping of the core to be adjusted as a function of the measurement of level.
    EP00401273A 1999-05-21 2000-05-10 Apparatus for coating cores with an aqueous coating Expired - Lifetime EP1053806B8 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9906474A FR2793713B1 (en) 1999-05-21 1999-05-21 INSTALLATION FOR COATING FOUNDRY CORES WITH AN AQUEOUS PLASTER
    FR9906474 1999-05-21

    Publications (3)

    Publication Number Publication Date
    EP1053806A1 EP1053806A1 (en) 2000-11-22
    EP1053806B1 true EP1053806B1 (en) 2003-10-15
    EP1053806B8 EP1053806B8 (en) 2004-04-21

    Family

    ID=9545864

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00401273A Expired - Lifetime EP1053806B8 (en) 1999-05-21 2000-05-10 Apparatus for coating cores with an aqueous coating

    Country Status (7)

    Country Link
    EP (1) EP1053806B8 (en)
    AT (1) ATE251961T1 (en)
    DE (1) DE60005885T2 (en)
    DK (1) DK1053806T3 (en)
    ES (1) ES2208237T3 (en)
    FR (1) FR2793713B1 (en)
    PT (1) PT1053806E (en)

    Family Cites Families (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JPS59206138A (en) * 1983-05-07 1984-11-21 Toshiba Mach Co Ltd Automatic concentration adjuster for mold coating material
    FR2662955A1 (en) * 1990-06-06 1991-12-13 Renault Installation for the application of coatings

    Also Published As

    Publication number Publication date
    DE60005885T2 (en) 2004-11-04
    EP1053806B8 (en) 2004-04-21
    DK1053806T3 (en) 2004-02-09
    DE60005885D1 (en) 2003-11-20
    FR2793713A1 (en) 2000-11-24
    ES2208237T3 (en) 2004-06-16
    PT1053806E (en) 2004-03-31
    FR2793713B1 (en) 2001-08-10
    EP1053806A1 (en) 2000-11-22
    ATE251961T1 (en) 2003-11-15

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