EP0295976A1 - Tool for extruding alveolar ceramic articles - Google Patents

Tool for extruding alveolar ceramic articles Download PDF

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Publication number
EP0295976A1
EP0295976A1 EP88401195A EP88401195A EP0295976A1 EP 0295976 A1 EP0295976 A1 EP 0295976A1 EP 88401195 A EP88401195 A EP 88401195A EP 88401195 A EP88401195 A EP 88401195A EP 0295976 A1 EP0295976 A1 EP 0295976A1
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EP
European Patent Office
Prior art keywords
network
holes
slots
tool
block
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.)
Withdrawn
Application number
EP88401195A
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German (de)
French (fr)
Inventor
Louis Minjolle
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.)
Ceramiques et Composites SA
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Ceramiques et Composites SA
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Filing date
Publication date
Application filed by Ceramiques et Composites SA filed Critical Ceramiques et Composites SA
Publication of EP0295976A1 publication Critical patent/EP0295976A1/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26Extrusion dies
    • B28B3/269For multi-channeled structures, e.g. honeycomb structures

Definitions

  • the present invention relates to a tool for extruding cellular ceramics, intended in particular for producing cellular structures with very thin walls, of the order of one to a few tenths of a millimeter, with a relatively large mesh, the cells having one side of at least one millimeter.
  • Such tooling is generally formed by a steel block into which is pierced a first network of holes used for the admission of the ceramic paste, these each opening at one of the intersections of a second network of slots which cross and form the cellular ceramic when the dough passes through the tool.
  • the dough successively fills the intake holes and forms a set of cylinders with parallel axes, then from each of these cylinders, forms a cruciform profile by penetrating into the intersection of the slots from the second network. Finally by welding together different cruciform profiles, is formed from these, the desired cellular profile.
  • the object of the present invention is to provide a tool guaranteeing an excellent quality of manufacture of cellular ceramic.
  • the tool according to the invention for the extrusion of cellular ceramics, consisting of a steel block in which is drilled from a first face, a network of holes used for the admission of the ceramic paste and each opening at one of the intersections of a network of slots which are formed from a second opposite face of the block, which intersect and form the cellular ceramic when the dough passes through the tool, is characterized in that the depth of the holes in the network of holes is such that each of these holes penetrates into the slots of the network of slots over a length which is at least about the diameter of the hole.
  • the network of slots forms polygonal, preferably quadrangular, more particularly square meshes.
  • an extrusion tool usually includes a network of cylindrical holes, distributed in a grid and each arranged vertically at one of the intersections 13 of a network of orthogonal cross slits therebetween. the holes open on one of the faces of a block constituting the tool and open into the network of slots which opens on the other side.
  • Figure 2 shows the successive sections taken by an element of ceramic paste pushed back through the tooling which, in A, first fills a cylindrical hole 10, then reaches the intersection and takes a cruciform profile B and finally meets to adjacent elements, at C, to form with them the honeycomb structure.
  • Figure 3 is a sectional view of a tool made according to the invention and to overcome this drawback.
  • Each hole 10, starting from one face 15 of the block is drilled to a depth which, in this example is slightly greater than half of the total height of the block, up to a bottom 16 conical in the usual way (conicity generally the point of the drill used for drilling).
  • the depth of the holes 10 is such that each of these holes penetrates into the slots or grooves 11 and 12 of the second network over a length which is at least of the order of the diameter of the hole.
  • the bottoms 18, 19 of the slots 11, 12 are located above the bottom 16 of the hole ( Figures 3 and 6).
  • the tooling according to the invention allows a very marked reduction in the rate of ceramic waste, at the same time as an improvement in the mechanical properties of the ceramics produced with this tooling.
  • the tooling according to the present invention is very particularly suitable for the extrusion of elements intended to be subjected to high temperatures and pressures, for example filter elements for liquid metals, in which case these elements are formed of refractory materials.

Abstract

The tool consists of a block of steel, into which there is pierced, starting from a first face, a network of holes serving for the admission of the ceramic paste and each opening at one of the intersections of a network of slots which are made starting from a second, opposite face of the block. The depth of the holes (1a) of the network of holes is such that each of these holes penetrates into the slots (11, 12) of the network of slots over a length which is at least of the order of the diameter of the hole. Application in the manufacture of monobloc extrusion dies for thin- wall alveolar ceramic articles. <IMAGE>

Description

La présente invention se rapporte à un outillage d'ex­trusion de céramiques alvéolaires, destiné en particulier à la réalisation de structures alvéolaires à paroi très mince, de l'ordre de un à quelques dixièmes de millimètre, avec une maille relativement importante, les alvéoles ayant un côté d'au moins un millimètre.The present invention relates to a tool for extruding cellular ceramics, intended in particular for producing cellular structures with very thin walls, of the order of one to a few tenths of a millimeter, with a relatively large mesh, the cells having one side of at least one millimeter.

Un tel outillage est généralement formé par un bloc d'acier dans lequel est percé un premier réseau de trous servant à l'admission de la pâte céramique, ceux-ci débouchant chacun à l'une des intersections d'un second réseau de fentes qui se croisent et forment la céramique alvéolaire lorsque la pâte traverse l'outillage.Such tooling is generally formed by a steel block into which is pierced a first network of holes used for the admission of the ceramic paste, these each opening at one of the intersections of a second network of slots which cross and form the cellular ceramic when the dough passes through the tool.

Au cours de l'extrusion, la pâte, successivement, rem­plit les trous d'admission et forme un ensemble de cylindres d'axes parallèles, puis à partir de chacun de ces cylindres, forme un profilé cruciforme en pénétrant dans l'intersection des fentes du second réseau. Enfin par soudure entre eux des différents profilés cruciformes, se constitue, à partir de ces derniers, le profilé alvéolaire désiré.During extrusion, the dough successively fills the intake holes and forms a set of cylinders with parallel axes, then from each of these cylinders, forms a cruciform profile by penetrating into the intersection of the slots from the second network. Finally by welding together different cruciform profiles, is formed from these, the desired cellular profile.

Cette dernière phase est la plus difficile à obtenir car le recollement entre eux des différents profilés cruciformes n'est obtenu avec une qualité suffisante, que si l'outillage est soigneusement étudié.This last phase is the most difficult to obtain because the bonding between them of the various cruciform profiles is only obtained with sufficient quality, if the tools are carefully studied.

La présente invention a pour objet de fournir un outil­lage garantissant une excellente qualité de fabrication de la céramique alvéolaire.The object of the present invention is to provide a tool guaranteeing an excellent quality of manufacture of cellular ceramic.

L'outillage selon l'invention, pour l'extrusion de céramiques alvéolaires, consistant en un bloc d'acier dans lequel est percé à partir d'une première face, un réseau de trous servant à l'admission de la pâte céramique et débouchant chacun à l'une des intersections d'un réseau de fentes qui sont ménagées à partir d'une seconde face opposée du bloc, qui se croisent et forment la céramique alvéolaire lorsque la pâte traverse l'outillage, est caractérisé en ce que la profondeur des trous du réseau de trous est telle que chacun de ces trous pénètre dans les fentes du réseau de fentes sur une longueur qui est au moins de l'ordre du diamètre du trou.The tool according to the invention, for the extrusion of cellular ceramics, consisting of a steel block in which is drilled from a first face, a network of holes used for the admission of the ceramic paste and each opening at one of the intersections of a network of slots which are formed from a second opposite face of the block, which intersect and form the cellular ceramic when the dough passes through the tool, is characterized in that the depth of the holes in the network of holes is such that each of these holes penetrates into the slots of the network of slots over a length which is at least about the diameter of the hole.

Selon une forme d'exécution de l'invention, le réseau des fentes forme des mailles polygonales, de préférence quadrangulaires, plus particulièrement carrées.According to one embodiment of the invention, the network of slots forms polygonal, preferably quadrangular, more particularly square meshes.

Grâce à ces dispositions, l'étalement de la pâte commence à partir d'une certaine distance avant le fond du trou et se trouve ainsi facilité.Thanks to these arrangements, the spreading of the dough begins from a certain distance before the bottom of the hole and is thus facilitated.

Les caractéristiques et avantages de l'invention res­sortiront mieux de la description suivante, qui n'est donnée qu'à titre d'exemple, en référence au dessin annexé dans lequel:

  • - les figures 1 et 2 montrent respectivement, en plan, vu de dessus, un outillage d'extrusion de céramique alvéolaire, d'aspect traditionnel, et les sections successives que prend un élément de pâte céramique lors de la traversée de cet outillage;
  • - la figure 3 est une vue partielle en coupe d'une forme de réalisation de l'outillage selon l'invention;
  • - la figure 4 montre différentes sections d'écoulement de la pâte dans cet outillage, entre son admission et sa sortie;
  • - les figures 5 et 6 sont deux vues analogues de canaux d'écoulement, respectivement dans un outillage traditionnel et dans une forme de réalisation de l'outillage selon l'invention.
The characteristics and advantages of the invention will emerge more clearly from the following description, which is given only by way of example, with reference to the appended drawing in which:
  • - Figures 1 and 2 show respectively, in plan, seen from above, a tool for extruding cellular ceramic, of traditional appearance, and the successive sections taken by an element of ceramic paste during the crossing of this tool;
  • - Figure 3 is a partial sectional view of an embodiment of the tool according to the invention;
  • - Figure 4 shows different sections of flow of the dough in this tool, between its inlet and its outlet;
  • - Figures 5 and 6 are two similar views of flow channels, respectively in a traditional tool and in an embodiment of the tool according to the invention.

Comme le montre la figure 1, un outillage d'extrusion comporte habituellement un réseau de trous cylindriques, répartis selon un quadrillage et disposés chacun à l'aplomb d'une des intersections 13 d'un réseau de fentes croisées orthogonales entre elles. les trous s'ouvrent sur l'une des faces d'un bloc constituant l'outillage et débouchent dans le réseau de fentes qui s'ouvre sur l'autre face.As shown in Figure 1, an extrusion tool usually includes a network of cylindrical holes, distributed in a grid and each arranged vertically at one of the intersections 13 of a network of orthogonal cross slits therebetween. the holes open on one of the faces of a block constituting the tool and open into the network of slots which opens on the other side.

La figure 2 montre les sections successives que prend un élément de pâte céramique refoulé à travers l'outillage qui, en A, emplit d'abord un trou cylindrique 10, puis parvient à l'intersection et prend un profil cruciforme B et enfin se réunit à des éléments adjacents, en C, pour constituer avec ceux-ci la structure alvéolaire.Figure 2 shows the successive sections taken by an element of ceramic paste pushed back through the tooling which, in A, first fills a cylindrical hole 10, then reaches the intersection and takes a cruciform profile B and finally meets to adjacent elements, at C, to form with them the honeycomb structure.

C'est la formation de cette structure par réunion et soudure entre eux des profilés cruciformes qui présente des difficultés.It is the formation of this structure by joining and welding cruciform profiles together which presents difficulties.

La figure 3 est une vue en coupe d'un outillage réalisé selon l'invention et permettant de remédier à cet inconvénient.Figure 3 is a sectional view of a tool made according to the invention and to overcome this drawback.

Chaque trou 10, partant d'une face 15 du bloc est percé sur une profondeur qui, dans cet exemple est légèrement supé­rieure à la moitié de la hauteur totale du bloc, jusqu'à un fond 16 conique de manière habituelle (conicité due générale­ment à la pointe du foret utilisé pour le perçage).Each hole 10, starting from one face 15 of the block is drilled to a depth which, in this example is slightly greater than half of the total height of the block, up to a bottom 16 conical in the usual way (conicity generally the point of the drill used for drilling).

Dans l'autre face 17 opposée du bloc, s'ouvrent les fentes 11 et 12 du réseau croisé, les axes des trous 10 étant à l'aplomb des intersections 13 de ces fentes.In the other opposite face 17 of the block, the slots 11 and 12 of the crossed network open, the axes of the holes 10 being perpendicular to the intersections 13 of these slots.

Habituellement, comme le montre la figure 5, les inter­sections 13 en question sont au niveau des fonds 16 et la matière extrudée atteignant ce fond 16 est repoussée selon les fléches F₁ dans les fentes 11 et 12.Usually, as shown in FIG. 5, the intersections 13 in question are at the bottoms 16 and the extruded material reaching this bottoms 16 is pushed back according to the arrows F₁ in the slots 11 and 12.

Selon la présente invention, la profondeur des trous 10 est telle que chacun de ces trous pénètre dans les fentes ou rainures 11 et 12 du second réseau sur une longueur qui est au moins de l'ordre du diamètre du trou. En d'autres termes, les fonds 18, 19 des fentes 11, 12 sont situés au-dessus du fond 16 du trou (figures 3 et 6).According to the present invention, the depth of the holes 10 is such that each of these holes penetrates into the slots or grooves 11 and 12 of the second network over a length which is at least of the order of the diameter of the hole. In other words, the bottoms 18, 19 of the slots 11, 12 are located above the bottom 16 of the hole (Figures 3 and 6).

Ainsi l'étalement latéral de la matière, qui suit les parcours des flèches F₂ est grandement facilité et on constate un collage très amélioré des profilés en croix les uns aux autres en bout, la transition s'opérant sur une plus grande hauteur, comme le montre la figure 4, disposée en regard des différentes sections d'écoulement que présente l'outillage de la figure 3; on retrouve bien entendu les sections A, B, C précédemment décrites.Thus the lateral spreading of the material, which follows the paths of the arrows F₂ is greatly facilitated and there is a very improved bonding of the cross sections to each other at the end, the transition taking place over a greater height, as the shows Figure 4, arranged opposite the different flow sections presented by the tool of Figure 3; there are of course sections A, B, C previously described.

L'outillage selon l'invention permet une très nette diminution du taux de déchets des céramiques, en même temps qu'une amélioration des propriétés mécaniques des céramiques réalisées avec cet outillage.The tooling according to the invention allows a very marked reduction in the rate of ceramic waste, at the same time as an improvement in the mechanical properties of the ceramics produced with this tooling.

L'outillage selon la présente invention est tout parti­culièrement convenable pour l'extrusion d'éléments destinés à être soumis à de fortes températures et pressions, par exemple d'éléments de filtres pour métaux liquides, auquel cas ces éléments sont formés de matériaux réfractaires.The tooling according to the present invention is very particularly suitable for the extrusion of elements intended to be subjected to high temperatures and pressures, for example filter elements for liquid metals, in which case these elements are formed of refractory materials.

Bien entendu, la présente invention n'est pas limitée aux modes de réalisations décrits et représentés et elle est susceptible de nombreuses variantes accessibles à l'homme de l'art, sans que l'on ne s'écarte de l'esprit de l'invention.Of course, the present invention is not limited to the embodiments described and shown and it is capable of numerous variants accessible to those skilled in the art, without departing from the spirit of the invention. 'invention.

Claims (2)

1.- Outillage d'extrusion de céramiques alvéolaires consistant en un bloc d'acier dans lequel est percé à partir d'une première face un réseau de trous servant à l'admission de la pâte céramique et débouchant chacun à l'une des inter­sections d'un réseau de fentes qui sont ménagées à partir d'une seconde face opposée du bloc, qui se croisent et forment la céramique alvéolaire lorsque la pâte traverse l'outillage, caractérisé en ce que la profondeur des trous (10) du réseau de trous est telle que chacun de ces trous pénètre dans les fentes (11, 12) du réseau de fentes sur une longueur qui est au moins de l'ordre du diamètre du trou.1.- Extrusion tools for cellular ceramics consisting of a steel block in which is pierced from a first face a network of holes used for the admission of ceramic paste and each opening at one of the intersections of a network of slots which are formed from a second opposite face of the block, which intersect and form the cellular ceramic when the dough passes through the tool, characterized in that the depth of the holes (10) of the network of holes is such that each of these holes enters the slots (11, 12) of the network of slots over a length which is at least of the order of the diameter of the hole. 2.- Outillage selon la revendication 1, caractérisé en ce que le réseau des fentes forme des mailles polygonales, de préférence quadrangulaires.2.- Tool according to claim 1, characterized in that the network of slots forms polygonal meshes, preferably quadrangular.
EP88401195A 1987-05-20 1988-05-18 Tool for extruding alveolar ceramic articles Withdrawn EP0295976A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8707040A FR2615436A1 (en) 1987-05-20 1987-05-20 TOOLING EXTRUSION OF ALVEOLAR CERAMICS
FR8707040 1987-05-20

Publications (1)

Publication Number Publication Date
EP0295976A1 true EP0295976A1 (en) 1988-12-21

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EP88401195A Withdrawn EP0295976A1 (en) 1987-05-20 1988-05-18 Tool for extruding alveolar ceramic articles

Country Status (13)

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EP (1) EP0295976A1 (en)
JP (1) JPS6464805A (en)
KR (1) KR880013669A (en)
CN (1) CN88102952A (en)
AU (1) AU1588288A (en)
BR (1) BR8802416A (en)
DK (1) DK274288A (en)
FI (1) FI882375A (en)
FR (1) FR2615436A1 (en)
IL (1) IL86429A0 (en)
NO (1) NO882165L (en)
PT (1) PT87533A (en)
ZA (1) ZA883312B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2269790B1 (en) * 2008-03-28 2015-01-21 Hitachi Metals, Ltd. Die for forming ceramic honeycomb structure
CN105269660B (en) * 2014-07-09 2017-08-15 江阴华音陶瓷机电科技有限公司 A kind of ceramic honeycomb filter extrusion die
CN104690811A (en) * 2015-03-16 2015-06-10 中国科学院福建物质结构研究所 Hot pressing mold easy to de-mold and method for preparing porous structure ceramic by hot pressing mold
CN106827187B (en) * 2016-12-27 2019-05-07 兴化市天东软件科技有限公司 A kind of catalyst carrier shaping mechanism

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2287322A1 (en) * 1974-10-10 1976-05-07 Philips Nv METHOD AND DEVICE FOR THE MANUFACTURE, BY EXTRUSION, OF HOLLOW PROFILE BODIES
US4168944A (en) * 1976-08-24 1979-09-25 Ngk Spark Plug Co., Ltd. Apparatus for manufacturing a tubular honeycomb assembly with an adiabatic layer formed integrally on the peripheral wall
US4259057A (en) * 1978-12-29 1981-03-31 Saki Chemical Industry Co., Ltd. Method of continuously extruding and molding ceramic honey-comb shaped moldings and die for use in the continuous extruding operation thereof
EP0120716A2 (en) * 1983-03-29 1984-10-03 Corning Glass Works Extrusion die
DE3521883A1 (en) * 1984-06-19 1985-12-19 Sakai Chemical Industry Co. Ltd., Sakai, Osaka Process for the continuous extrusion and shaping of cellular or honeycomb mouldings and continuous extrusion die for this

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2287322A1 (en) * 1974-10-10 1976-05-07 Philips Nv METHOD AND DEVICE FOR THE MANUFACTURE, BY EXTRUSION, OF HOLLOW PROFILE BODIES
US4168944A (en) * 1976-08-24 1979-09-25 Ngk Spark Plug Co., Ltd. Apparatus for manufacturing a tubular honeycomb assembly with an adiabatic layer formed integrally on the peripheral wall
US4259057A (en) * 1978-12-29 1981-03-31 Saki Chemical Industry Co., Ltd. Method of continuously extruding and molding ceramic honey-comb shaped moldings and die for use in the continuous extruding operation thereof
EP0120716A2 (en) * 1983-03-29 1984-10-03 Corning Glass Works Extrusion die
DE3521883A1 (en) * 1984-06-19 1985-12-19 Sakai Chemical Industry Co. Ltd., Sakai, Osaka Process for the continuous extrusion and shaping of cellular or honeycomb mouldings and continuous extrusion die for this

Also Published As

Publication number Publication date
DK274288D0 (en) 1988-05-19
DK274288A (en) 1988-11-21
FR2615436A1 (en) 1988-11-25
KR880013669A (en) 1988-12-21
BR8802416A (en) 1988-12-13
CN88102952A (en) 1988-12-28
NO882165L (en) 1988-11-21
NO882165D0 (en) 1988-05-18
FI882375A0 (en) 1988-05-19
IL86429A0 (en) 1988-11-15
JPS6464805A (en) 1989-03-10
FI882375A (en) 1988-11-21
PT87533A (en) 1989-05-31
AU1588288A (en) 1988-11-24
ZA883312B (en) 1990-04-25

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