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EP0234979A1 - Filter made from refractory material - Google Patents

Filter made from refractory material Download PDF

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Publication number
EP0234979A1
EP0234979A1 EP19870400109 EP87400109A EP0234979A1 EP 0234979 A1 EP0234979 A1 EP 0234979A1 EP 19870400109 EP19870400109 EP 19870400109 EP 87400109 A EP87400109 A EP 87400109A EP 0234979 A1 EP0234979 A1 EP 0234979A1
Authority
EP
European Patent Office
Prior art keywords
holes
perforations
pins
plate
refractory material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19870400109
Other languages
German (de)
French (fr)
Other versions
EP0234979B1 (en
Inventor
Jacques Desobeau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daussan SAS
Original Assignee
Daussan SAS
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Filing date
Publication date
Application filed by Daussan SAS filed Critical Daussan SAS
Publication of EP0234979A1 publication Critical patent/EP0234979A1/en
Application granted granted Critical
Publication of EP0234979B1 publication Critical patent/EP0234979B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086—Filters

Definitions

  • the refractory filters made up to now have the drawback of not having a constant passage coefficient; this coefficient, which is most often defined as a function of the number of pores per linear inch or as a percentage of vacuum, in fact varies from one filter to another. The quality of the filtration is therefore not constant either.
  • the present invention relates to a refractory material filter which overcomes this drawback.
  • the filter according to the invention is characterized in that it is formed of a series of trays of refractory material, possibly reinforced, for example using wires or a glass cloth, which are superimposed, being separated from each other, in their central parts, by empty spaces, and have holes or perforations, the holes or perforations of a tray being arranged in a row designed in relation to the holes or perforations of the adjacent plates so as to form baffles.
  • the holes or perforations can have any dimensions, depending on the desired speed of passage, dirt to be stopped or the quality of filtration. They can be cylindrical or frustoconical; they can have a circular, rectangular or square section.
  • the holes or perforations on the same plate can be aligned in two perpendicular directions; they can possibly be staggered.
  • each tray may have a projecting peripheral border.
  • the edge of the upper tray delimits a central void between the two trays.
  • each plate and its lower face may comprise at their periphery respectively pins and holes of the same diameter, these pins and these holes being arranged so that, when two plates are superimposed, the pins of the lower plate s 'engage in the holes of the upper plate, which guarantees the relative angular position of the two plates.
  • the filter according to the invention consists of trays made of re which are superimposed and, in Figure 1, three in number and indicated by the references la, lb and lc. These plates are identical, except for the fact that the upper plate 1a is thicker than the other two so as to have sufficient resistance during casting.
  • each plate 1 has on its underside a peripheral edge 2 projecting. It is pierced with holes 3 which are staggered. Furthermore, the holes of each column are, at each end of the column, located near the border 2 for a column, but spaced from this border by a distance at least equal to the diameter of the holes for the two adjacent columns. On the other hand, the end holes of each row are, one located near the border and the other spaced from this border by a distance at least equal to the diameter of the holes.
  • each of the plates 1 has on its upper face pins 5 which are of the same diameter as the holes.
  • Each of the plates is formed by pouring a refractory clay, for example an alumina slip, into a mold comprising punches whose arrangement and dimensions correspond to those of the holes 3. After closing the mold and compressing, let the clay dry. This is then baked in the usual way, for example at 900 ° C, then then at 1400 ° C, possibly with enameling.
  • a refractory clay for example an alumina slip
  • a number of plates 1 are superimposed by placing them alternately on one side and on the other, that is to say that each plate is offset from the adjacent plates by an angle of 180 ° around a vertical axis.
  • the pins 5 of a plate are thus located opposite the holes 4 of the plate which surmounts it and can thus be fitted into these holes, which secures the two plates.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Materials (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

Filter made up of a series of trays (1a, 1b and 1c) made of refractory material, optionally reinforced, for example with the aid of glass fibre or cloth, which are superposed, being separated from each other in their middle parts by empty spaces (6) and having holes or perforations (3), the holes or perforations of a tray being arranged quincuncially in relation to the holes or perforations of the adjacent trays, so as to form chicanes. <IMAGE>

Description

Pour obtenir des pièces métalliques en fonderie, en particulier des pièces en métaux non ferreux, il est usuel de filtrer le métal fondu, afin d'éliminer les crasses, les peaux, ainsi que les corps étrangers se trouvant éventuellement dans le métal; on supprime ainsi les points durs ou autres défauts dans les pièces. Cette filtration est souvent assurée par des filtres en matière réfractaire.In order to obtain metal parts in foundries, in particular parts made of non-ferrous metals, it is usual to filter the molten metal, in order to remove dross, skins, as well as the foreign bodies possibly found in the metal; this removes hard points or other faults in the parts. This filtration is often provided by filters made of refractory material.

Les filtres en matière réfractaire réalisés jusqu'à présent présentent l'inconvénient de ne pas avoir un coefficient de passage constant; ce coefficient, qui est défini le plus souvent en fonction du nombre de pores au pouce linéaire ou en pourcentage de vide, varie en effet d'un filtre à un autre. La qualité de la filtration n'est donc pas non plus constante.The refractory filters made up to now have the drawback of not having a constant passage coefficient; this coefficient, which is most often defined as a function of the number of pores per linear inch or as a percentage of vacuum, in fact varies from one filter to another. The quality of the filtration is therefore not constant either.

La présente invention a pour objet un filtre en matière réfractaire qui remédie à cet inconvénient.The present invention relates to a refractory material filter which overcomes this drawback.

Le filtre selon l'invention est caractérisé en ce qu'il est formé d'une série de plateaux en matière réfractaire, éventuellement armée, par exemple à l'aide de fils ou d'un tissu de verre, qui sont superposés, en étant séparés les uns des autres, dans leurs parties centrales, par des espaces vides, et présentent des trous ou des perforations, les trous ou perforations d'un plateau étant disposés en quinconce par rapport aux trous ou perforations des plateaux adjacents de manière à former des chicanes.The filter according to the invention is characterized in that it is formed of a series of trays of refractory material, possibly reinforced, for example using wires or a glass cloth, which are superimposed, being separated from each other, in their central parts, by empty spaces, and have holes or perforations, the holes or perforations of a tray being arranged in a row designed in relation to the holes or perforations of the adjacent plates so as to form baffles.

Les trous ou perforations peuvent avoir des dimensions quelconques, en fonction de la vitesse de passage recherchée, des crasses à arrêter ou de la qualité de filtration. Ils peuvent être cylindriques ou tronconiques; ils peuvent avoir une section circulaire, rectangulaire ou carrée.The holes or perforations can have any dimensions, depending on the desired speed of passage, dirt to be stopped or the quality of filtration. They can be cylindrical or frustoconical; they can have a circular, rectangular or square section.

Les trous ou perforations d'un même plateau peuvent être alignés suivant deux directions perpendiculaires; ils peuvent éventuellement être en quinconce.The holes or perforations on the same plate can be aligned in two perpendicular directions; they can possibly be staggered.

La face inférieure de chaque plateau peut comporter une bordure périphérique en saillie. Lorsqu'on place deux plateaux l'un sur l'autre, la bordure du plateau supérieur délimite un vide central entre les deux plateaux.The underside of each tray may have a projecting peripheral border. When two trays are placed on top of each other, the edge of the upper tray delimits a central void between the two trays.

La face supérieure de chaque plateau et-sa face inférieure peuvent comporter à leur périphérie respectivement des tétons et des trous de même diamètre, ces tétons et ces trous étant disposés de façon que, lorsqu'on superpose deux plateaux, les tétons du plateau inférieur s'engagent dans les trous du plateau supérieur, ce qui garantit la mise en position angulaire relative des deux plateaux.The upper face of each plate and its lower face may comprise at their periphery respectively pins and holes of the same diameter, these pins and these holes being arranged so that, when two plates are superimposed, the pins of the lower plate s 'engage in the holes of the upper plate, which guarantees the relative angular position of the two plates.

On a décrit ci-après, à titre d'exemple non limitatif, un mode de réalisation du filtre selon l'invention, avec référence au dessin annexé dans lequel :

  • La Figure 1 est une vue en coupe du filtre;
  • La Figure 2 est une vue en plan d'un plateau;
  • La Figure 3 est une coupe suivant III-III de la Figure 2.
An embodiment of the filter according to the invention has been described below, by way of non-limiting example, with reference to the appended drawing in which:
  • Figure 1 is a sectional view of the filter;
  • Figure 2 is a plan view of a tray;
  • Figure 3 is a section along III-III of Figure 2.

Tel qu'il est représenté au dessin, le filtre selon l'invention est constitué de plateaux en matière réfractaire qui sont superposés et, à la Figure 1, au nombre de trois et indiqués par les références la, lb et lc. Ces plateaux sont identiques, à l'exception du fait que le plateau supérieur la est plus épais que les deux autres afin de présenter une résistance suffisante lors de la coulée.As shown in the drawing, the filter according to the invention consists of trays made of re which are superimposed and, in Figure 1, three in number and indicated by the references la, lb and lc. These plates are identical, except for the fact that the upper plate 1a is thicker than the other two so as to have sufficient resistance during casting.

Comme on le voit plus particulièrement aux Figures 2 et 3, chaque plateau 1 comporte sur sa face inférieure une bordure périphérique 2 en saillie. Il est percé de trous 3 qui sont disposés en quinconce. Par ailleurs les trous de chaque colonne sont, à chacune des extrémités de la colonne, situés à proximité de la bordure 2 pour une colonne, mais écartés de cette bordure d'une distance au moins égale au diamètre des trous pour les deux colonnes adjacentes. En revanche, les trous d'extrémité de chaque rangée sont, l'un situé à proximité de la bordure et l'autre écarté de cette bordure d'une distance au moins égale au diamètre des trous.As seen more particularly in Figures 2 and 3, each plate 1 has on its underside a peripheral edge 2 projecting. It is pierced with holes 3 which are staggered. Furthermore, the holes of each column are, at each end of the column, located near the border 2 for a column, but spaced from this border by a distance at least equal to the diameter of the holes for the two adjacent columns. On the other hand, the end holes of each row are, one located near the border and the other spaced from this border by a distance at least equal to the diameter of the holes.

La bordure 2 présente, sur chacun de ses bords latéraux, des tétons 5, les trous 4 situés d'un côté étant disposés en quinconce avec les trous situés du côté opposé. Enfin, chacun des plateaux 1, à l'exception du plateau supérieur la, comporte sur sa face supérieure des tétons 5 qui sont de même diamètre que les trous.The edge 2 has, on each of its lateral edges, pins 5, the holes 4 located on one side being staggered with the holes located on the opposite side. Finally, each of the plates 1, with the exception of the upper plate 1a, has on its upper face pins 5 which are of the same diameter as the holes.

Chacun des plateaux est formé par coulée d'une glaise réfractaire, par exemple d'une barbotine d'alumine, dans un moule comportant des poinçons dont la disposition et les dimensions correspondent à celles des trous 3. Après fermeture du moule et compression, on laisse sécher la glaise. Celle-ci est ensuite cuite de la manière usuelle, par exemple à 900° C, puis ensuite à 1400° C, éventuellement avec émaillage.Each of the plates is formed by pouring a refractory clay, for example an alumina slip, into a mold comprising punches whose arrangement and dimensions correspond to those of the holes 3. After closing the mold and compressing, let the clay dry. This is then baked in the usual way, for example at 900 ° C, then then at 1400 ° C, possibly with enameling.

Pour monter le filtre, on superpose un certain nombre de plateaux 1 en les plaçant alternativement d'un côté et de l'autre, c'est-à-dire que chaque plateau est décalé par rapport aux plateaux adjacents d'un angle de 180° autour d'un axe vertical. Les tétons 5 d'un plateau se trouvent ainsi en regard des trous 4 du plateau qui le surmonte et peuvent ainsi être emboîtés dans ces trous, ce qui solidarise les deux plateaux.To mount the filter, a number of plates 1 are superimposed by placing them alternately on one side and on the other, that is to say that each plate is offset from the adjacent plates by an angle of 180 ° around a vertical axis. The pins 5 of a plate are thus located opposite the holes 4 of the plate which surmounts it and can thus be fitted into these holes, which secures the two plates.

Quand les plateaux sont superposés il existe, entre deux plateaux adjacents, un espace vide 6 délimité par la bordure 2 du plateau supérieur. Par ailleurs, les trous 3 d'un plateau sont disposés en quinconce avec les trous des deux plateaux adjacents et ne communiquer avec ces derniers trous que par l'intermédiaire des espaces 6.When the plates are superimposed there is, between two adjacent plates, an empty space 6 delimited by the edge 2 of the upper plate. Furthermore, the holes 3 of a plate are staggered with the holes of the two adjacent plates and communicate with these latter holes only through the spaces 6.

Claims (4)

1. Filtre en matière réfractaire, caractérisé en ce qu'il est formé d'une série de plateaux (la,lb et lc) en matière réfractaire, éventuellement armée, par exemple à l'aide de fils ou d'un tissu de verre, qui sont superposés, étant séparés les uns des autres, dans leurs parties centrales, par des espaces vides (6), et présentent des trous ou des perforations (3), les trous ou perforations d'un plateau étant disposés en quinconce par rapport aux trous ou perforations des plateaux adjacents de manière à former des chicanes.1. Refractory material filter, characterized in that it is formed of a series of trays (la, lb and lc) of refractory material, possibly reinforced, for example using wires or a glass cloth , which are superimposed, being separated from each other, in their central parts, by empty spaces (6), and have holes or perforations (3), the holes or perforations of a tray being staggered relative to to the holes or perforations of the adjacent plates so as to form baffles. 2. Filtre selon la revendication 1, caractérisé en ce que la face inférieure de chaque plateau comporte une bordure périphérique (2) en saillie.2. Filter according to claim 1, characterized in that the underside of each plate has a projecting peripheral edge (2). 3. Filtre selon la revendication 2, caractérisé en ce que la face supérieure de chaque plateau et sa face inférieure comportent, à leur périphérie, respectivement des tétons (5) et des trous (4) de même diamètre, ces tétons et ces trous étant disposés de façon que, lorsqu'on superpose deux plateaux, les tétons du plateau inférieur s'engagent dans les trous du plateau supérieur.3. Filter according to claim 2, characterized in that the upper face of each plate and its lower face comprise, at their periphery, pins (5) and holes (4) of the same diameter respectively, these pins and these holes being arranged so that, when two plates are superimposed, the pins of the lower plate engage in the holes of the upper plate. 4. Filtre selon les revendications 2 et 3, caractérisé en ce que les tétons (5) sont prévus sur la bordure (2).4. Filter according to claims 2 and 3, characterized in that the pins (5) are provided on the edge (2).
EP87400109A 1986-01-23 1987-01-19 Filter made from refractory material Expired - Lifetime EP0234979B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8601189 1986-01-23
FR8601189A FR2593077B1 (en) 1986-01-23 1986-01-23 REFRACTORY MATERIAL FILTER.

Publications (2)

Publication Number Publication Date
EP0234979A1 true EP0234979A1 (en) 1987-09-02
EP0234979B1 EP0234979B1 (en) 1992-11-11

Family

ID=9331568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400109A Expired - Lifetime EP0234979B1 (en) 1986-01-23 1987-01-19 Filter made from refractory material

Country Status (4)

Country Link
EP (1) EP0234979B1 (en)
DE (1) DE3782513T2 (en)
ES (1) ES2035091T3 (en)
FR (1) FR2593077B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991012062A3 (en) * 1990-02-09 1991-09-19 Hepworth Ind Ceramics Ltd Filter
EP0578517A1 (en) * 1992-05-29 1994-01-12 Daussan Et Compagnie Process for treating a molten metal during a casting operation using a filter and filter used therefor
FR2697444A1 (en) * 1992-10-30 1994-05-06 Daussan & Co Molten metal treatment for casting and simultaneous filtration
US5366209A (en) * 1991-12-04 1994-11-22 Daussan & Compagnie Filter for molten metal
US5603373A (en) * 1992-05-29 1997-02-18 Daussan Et Compagnie Process for treating molten metal during a casting operation using a filter and filter for implementing the process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR781101A (en) * 1934-02-01 1935-05-09 Process and apparatus for the purification of magnesium or its alloys
US3907513A (en) * 1974-05-30 1975-09-23 Us Energy Controlled porosity filter and uniform structure composites
US4298187A (en) * 1978-04-26 1981-11-03 Swiss Aluminium Ltd. Apparatus for inline degassing and filtration of molten metal
GB2101579A (en) * 1981-06-18 1983-01-19 Rolls Royce Ceramic structure
EP0135945A2 (en) * 1980-07-03 1985-04-03 Corning Glass Works Apparatus for filtering solid particulates

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721567A (en) * 1984-06-06 1988-01-26 Certech Inc. Ceramic pouring filter with tortuous flow paths

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR781101A (en) * 1934-02-01 1935-05-09 Process and apparatus for the purification of magnesium or its alloys
US3907513A (en) * 1974-05-30 1975-09-23 Us Energy Controlled porosity filter and uniform structure composites
US4298187A (en) * 1978-04-26 1981-11-03 Swiss Aluminium Ltd. Apparatus for inline degassing and filtration of molten metal
EP0135945A2 (en) * 1980-07-03 1985-04-03 Corning Glass Works Apparatus for filtering solid particulates
GB2101579A (en) * 1981-06-18 1983-01-19 Rolls Royce Ceramic structure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991012062A3 (en) * 1990-02-09 1991-09-19 Hepworth Ind Ceramics Ltd Filter
US5366209A (en) * 1991-12-04 1994-11-22 Daussan & Compagnie Filter for molten metal
EP0578517A1 (en) * 1992-05-29 1994-01-12 Daussan Et Compagnie Process for treating a molten metal during a casting operation using a filter and filter used therefor
US5603373A (en) * 1992-05-29 1997-02-18 Daussan Et Compagnie Process for treating molten metal during a casting operation using a filter and filter for implementing the process
US5690161A (en) * 1992-05-29 1997-11-25 Daussan Et Compagnie Process for treating molten metal during a casting operation using a filter and filter for implementing the process
FR2697444A1 (en) * 1992-10-30 1994-05-06 Daussan & Co Molten metal treatment for casting and simultaneous filtration

Also Published As

Publication number Publication date
DE3782513T2 (en) 1993-05-13
FR2593077A1 (en) 1987-07-24
FR2593077B1 (en) 1990-10-19
DE3782513D1 (en) 1992-12-17
ES2035091T3 (en) 1993-04-16
EP0234979B1 (en) 1992-11-11

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