ES2551142A2 - Dispositivo y procedimiento para la medición de la humedad en moldes de fundición a presión - Google Patents

Dispositivo y procedimiento para la medición de la humedad en moldes de fundición a presión Download PDF

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ES2551142A2
ES2551142A2 ES201530446A ES201530446A ES2551142A2 ES 2551142 A2 ES2551142 A2 ES 2551142A2 ES 201530446 A ES201530446 A ES 201530446A ES 201530446 A ES201530446 A ES 201530446A ES 2551142 A2 ES2551142 A2 ES 2551142A2
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mold
translation
hollow space
machine
legally binding
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ES2551142B1 (es
ES2551142R1 (es
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Konrad Baumgartner
Gérard Laurent HUGUENIN-VUILLEMIN YVES
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Fondarex SA
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Fondarex SA
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
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    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B22D17/145—Venting means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
    • G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7614—Humidity, moisture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
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  • Immunology (AREA)
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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Mold Materials And Core Materials (AREA)
  • Optical Measuring Cells (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

La invención se refiere a un dispositivo (1) y a un procedimiento para la medición de la humedad en moldes de fundición a presión (24), cuyo espacio hueco del molde (25) está conectado a través de un conducto de ventilación (31) con un dispositivo de ventilación (28). El dispositivo (1) configurado de manera modular puede conectarse con el conducto de ventilación (31) y comprende una disposición de sensores (S), mediante la cual puede medirse la humedad de gases extraídos del espacio hueco del molde (25). La disposición de sensores (S) presenta un emisor (7) que emite radiación electromagnética y un receptor (14) que detecta radiación electromagnética. Debido a los valores de medición determinados durante el proceso de evacuación, puede determinarse si la cantidad de una mezcla de agua y medio desmoldeador, que se inyecta antes del proceso de fundición propiamente dicho en el espacio hueco del molde (25), ha de modificarse.

Description

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la pieza de fundición e impide el pegado del metal al molde o a las paredes del espacio hueco del molde 25. La instalación de control 29 está conectada eléctricamente con el dispositivo 1, así como con los componentes 23, 24, 26, 27, 28, lo que se indica mediante líneas discontinuas.
Un ciclo de medición para la determinación de la humedad en el molde de fundición a presión 24 se produce aproximadamente de la siguiente manera. Con el molde de fundición a presión 24 abierto, se inyecta mediante el cabezal de rociado 26 la mezcla de agua y medio desmoldeador en el espacio hueco del molde 25. Junto con otros parámetros, la temperatura del molde de fundición a presión y la cantidad de mezcla de agua y medio desmoldeador inyectada, determina particularmente si se evapora todo el agua o solo una parte de ella. Tras la inyección de la mezcla se cierra el molde de fundición a presión 24. Antes de que comience el ciclo de medición propiamente dicho, se lleva a cabo un llamado ajuste a cero de la disposición de sensores S del dispositivo 1, para que por ejemplo, no entre un ensuciamiento eventual de los discos de vidrio en el resultado de la medición. Después de ello se evacua el espacio hueco del molde 25, en cuanto que se extraen mediante el tanque de vacío 28 a través del conducto de ventilación 31 y la válvula de ventilación 27 abierta, gases del espacio hueco del molde 25 y los canales y conductos 30, 31 conectados con éste. Con el inicio del proceso de extracción, se inicia entonces el ciclo de medición propiamente dicho, en cuanto que se mide o bien de manera continua o se llevan a cabo una pluralidad de mediciones individuales. En este caso se mide cómo de grande es la debilitación de la señal emitida o cómo de fuerte es la señal detectada por el receptor. Debido a la debilitación o a la elevación de la señal recibida, puede sacarse entonces una conclusión sobre cuál es la proporción de partículas de agua y/o vapor en el gas fluyente (aire). Para mantener lo más reducida posible la influencia de posibles fuentes de errores, como por ejemplo gases externos, humo, etc., se mide de manera particularmente preferida en el rango de longitud de onda infrarroja de entre 930 y 950 nm (nanómetros).
Preferiblemente un ciclo de medición consiste en una pluralidad de mediciones individuales. Debido a los valores de medición, como también al transcurso, pueden sacarse conclusiones en relación con la humedad en el molde de fundición. Un ciclo de medición también puede consistir no obstante, en una pluralidad de mediciones individuales, por ejemplo en 1000 mediciones individuales, calculándose a partir de una cantidad determinada de mediciones individuales, por ejemplo, a partir de 10 mediciones individuales, el valor medio y teniéndose en cuenta éste entonces como magnitud de medición, de manera que finalmente se tendrían en cuenta 100 puntos de medición. De esta manera puede minimizarse por ejemplo, la influencia de partículas sólidas individuales o más grandes, que se encuentran en el gas fluyente.
Dependiendo del resultado de la medición, puede modificarse para procesos de medición posteriores, la cantidad de mezcla de agua y medio desmoldeador a inyectar. En el caso de una proporción de agua demasiado grande, se reduce la cantidad de mezcla de agua y medio desmoldeador a inyectar, pudiéndose alargar en su caso también el proceso de extracción.
Habitualmente al principio de un ciclo de fundición, en el que por ejemplo, han de colarse varios miles de piezas, se lleva a cabo antes de cada proceso de fundición un ciclo de medición y eventualmente se modifica la cantidad de la mezcla de agua y medio desmoldeador a inyectar, y se hace durante tanto tiempo, hasta que se han estabilizado los parámetros determinantes como particularmente la temperatura del molde y la humedad del espacio hueco del molde a una medida predeterminada, teniendo que garantizarse naturalmente, que tras la evaporación del agua queda una película de medio desmoldeador continua. Después de ello, puede llevarse a cabo entonces a intervalos predeterminados, por ejemplo, cada hora o tras cada décimo proceso de fundición, un proceso de medición y modificarse debido a los valores de medición medidos o determinados eventualmente los parámetros. También puede modificarse obviamente la cantidad de la mezcla a aplicar localmente dentro del molde de fundición o del
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Claims (1)

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ES201530446A 2014-04-14 2015-04-01 Dispositivo y procedimiento para la medición de la humedad en moldes de fundición a presión Active ES2551142B1 (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00615/14A CH709493A2 (de) 2014-04-14 2014-04-14 Vorrichtung und Verfahren zur Messung der Feuchtigkeit in Druckgiessformen.
CH00615/14 2014-04-14

Publications (3)

Publication Number Publication Date
ES2551142A2 true ES2551142A2 (es) 2015-11-16
ES2551142R1 ES2551142R1 (es) 2016-03-31
ES2551142B1 ES2551142B1 (es) 2017-01-23

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US (1) US9804085B2 (es)
JP (1) JP6633287B2 (es)
KR (1) KR20150118539A (es)
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