EP0234979B1 - Filter made from refractory material - Google Patents

Filter made from refractory material Download PDF

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Publication number
EP0234979B1
EP0234979B1 EP87400109A EP87400109A EP0234979B1 EP 0234979 B1 EP0234979 B1 EP 0234979B1 EP 87400109 A EP87400109 A EP 87400109A EP 87400109 A EP87400109 A EP 87400109A EP 0234979 B1 EP0234979 B1 EP 0234979B1
Authority
EP
European Patent Office
Prior art keywords
holes
plates
plate
openings
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.)
Expired - Lifetime
Application number
EP87400109A
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German (de)
French (fr)
Other versions
EP0234979A1 (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
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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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    • 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 disadvantage 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 document EP-A-0 165 025 describes a filter formed by a series of refractory material plates which are superimposed and are provided on one of their faces with a peripheral edge projecting in contact with the adjacent plate, which determines the empty spaces separating the trays in their central part, and have openings, the openings of a tray being staggered relative to the openings of the adjacent trays so as to form baffles.
  • the height of the empty spaces is at most equal to the width of the openings and preferably equal to half this width. Under these conditions, there is no expansion but an acceleration of the flow to be filtered with compression of the metal; filtration takes place by mechanical blocking of the particles in an opening. So can only be retained dirt larger than either the width of the openings or the height of the spaces.
  • the metal cools quickly by passing through the filter and, in the case of the filtration of an aluminum alloy, the lower plates clog very quickly.
  • the present invention relates to an improved filter so as to remedy this drawback.
  • the openings are formed by cylindrical holes whose diameter is less than the height of the empty spaces.
  • each tray and its side lower may have 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 engage in the holes of the upper plate, this which guarantees the relative angular position of the two plates.
  • the filter according to the invention consists of trays of refractory material which are superimposed and, in Figure 1, three in number and indicated by the references 1 a , 1 b and 1 c . These plates are identical, except for the fact that the upper plate 1 a is thicker than the other two in order to have sufficient strength during casting.
  • each plate 1 has on its underside a peripheral edge 2 projecting. It is pierced with cylindrical 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.
  • the border 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 1 a , 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
  • each tray 1 is superimposed by placing them alternately on one side and the other, i.e. each tray is offset from the adjacent trays 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)

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.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 disadvantage 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.

Le document EP-A- 0 165 025 décrit un filtre formé d'une série de plateaux en matière réfractaire qui sont superposés et sont munis sur l'une de leurs faces d'une bordure périphérique en saillie au contact du plateau adjacent, ce qui détermine des espaces vides séparant les plateaux dans leur partie centrale, et présentent des ouvertures, les ouvertures d'un plateau étant disposées en quinconce par rapport aux ouvertures des plateaux adjacents de manière à former des chicanes. Mais la hauteur des espaces vides est au plus égale à la largeur des ouvertures et de préférence égale à la moitié de cette largeur. Dans ces conditions, il n'y a pas de détente mais une accélération du flux à filtrer avec compression du métal; la filtration s'effectue par un blocage mécanique des particules dans une ouverture. Ne peuvent donc être retenues que les crasses de dimensions supérieures soit à la largeur des ouvertures, soit à la hauteur des espaces. Le métal se refroidit rapidement en traversant le filtre et, dans le cas de la filtration d'un alliage d'aluminium, les plateaux inférieurs se colmatent très rapidement.The document EP-A-0 165 025 describes a filter formed by a series of refractory material plates which are superimposed and are provided on one of their faces with a peripheral edge projecting in contact with the adjacent plate, which determines the empty spaces separating the trays in their central part, and have openings, the openings of a tray being staggered relative to the openings of the adjacent trays so as to form baffles. However, the height of the empty spaces is at most equal to the width of the openings and preferably equal to half this width. Under these conditions, there is no expansion but an acceleration of the flow to be filtered with compression of the metal; filtration takes place by mechanical blocking of the particles in an opening. So can only be retained dirt larger than either the width of the openings or the height of the spaces. The metal cools quickly by passing through the filter and, in the case of the filtration of an aluminum alloy, the lower plates clog very quickly.

La présente invention a pour objet un filtre perfectionné de manière à remédier à cet inconvénient.The present invention relates to an improved filter so as to remedy this drawback.

Selon l'invention, les ouvertures sont constituées par des trous cylindriques dont le diamètre est inférieur à la hauteur des espaces vides.According to the invention, the openings are formed by cylindrical holes whose diameter is less than the height of the empty spaces.

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 side of each tray and its side lower may have 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 engage in the holes of the upper plate, this 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 1a, 1b et 1c. Ces plateaux sont identiques, à l'exception du fait que le plateau supérieur 1a 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 of refractory material which are superimposed and, in Figure 1, three in number and indicated by the references 1 a , 1 b and 1 c . These plates are identical, except for the fact that the upper plate 1 a is thicker than the other two in order to have sufficient strength 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 cylindriques 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. 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 1a, comporte sur sa face supérieure des tétons 5 qui sont de même diamètre que les 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 cylindrical 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. The border 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 1 a , 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 trays 1 are superimposed by placing them alternately on one side and the other, i.e. each tray is offset from the adjacent trays 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 communiquent avec ces derniers trous que par l'intermédiaire des espaces 6. Comme on le voit à la Figure 1, le diamètre des trous 3 est inférieur à la hauteur des espaces vides 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. As can be seen in Figure 1, the diameter of the holes 3 is less than the height of the empty spaces 6.

Claims (3)

  1. Filter made of a refractory material and formed of a set of plates (1a, 1b and 1c), also made of a refractory material, these plates being superimposed and provided on one of their faces with a projecting peripheral border (2) in contact with the adjacent plate, which determines empty spaces (6) separating the plates in their central portion, and having openings (3), the openings of a plate being disposed in quincunx with respect to the openings of the adjacent plates so as to form vapor traps, wherein the openings (3) are formed of cylindrical holes whose diameter is smaller than the height of the empty spaces (6).
  2. Filter according to claim 1, wherein the upper face of each plate and its lower face respectively comprise at their periphery dog points (5) and holes (4) of the same diameter, these dog points and holes being disposed in such a way that, when two plates are superimposed, the dog points of the lower plate are engaged in the holes of the upper plate.
  3. Filter according to claim 2, wherein the dog points (5) are provided on the border (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
FR8601189A FR2593077B1 (en) 1986-01-23 1986-01-23 REFRACTORY MATERIAL FILTER.
FR8601189 1986-01-23

Publications (2)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9003020D0 (en) * 1990-02-09 1990-04-04 Hepworth Ind Ceramics Ltd Filter
FR2684563B1 (en) * 1991-12-04 1994-05-27 Daussan & Co FILTER FOR LIQUID METAL CONSISTING OF PLATES WITH HOLES IN REFRACTORY MATERIAL.
FR2697444B1 (en) * 1992-10-30 1994-12-30 Daussan & Co Filter for liquid metal with inoculant.
DE69322006T2 (en) * 1992-05-29 1999-06-10 Daussan & Co Process for treating molten metal during a casting process using a filter and filter used therefor
TW234092B (en) * 1992-05-29 1994-11-11 Daussan Et Co

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165025A2 (en) * 1984-06-06 1985-12-18 Certech Incorporated Multi-element ceramic filter for molten metal

Family Cites Families (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
EP0043694B1 (en) * 1980-07-03 1986-02-12 Corning Glass Works Particulate filter and material for producing the same
GB2101579A (en) * 1981-06-18 1983-01-19 Rolls Royce Ceramic structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165025A2 (en) * 1984-06-06 1985-12-18 Certech Incorporated Multi-element ceramic filter for molten metal

Also Published As

Publication number Publication date
DE3782513T2 (en) 1993-05-13
ES2035091T3 (en) 1993-04-16
DE3782513D1 (en) 1992-12-17
EP0234979A1 (en) 1987-09-02
FR2593077B1 (en) 1990-10-19
FR2593077A1 (en) 1987-07-24

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