EP0294261A1 - Dispositif d'extrusion de structures alvéolaires en matériau céramique - Google Patents

Dispositif d'extrusion de structures alvéolaires en matériau céramique Download PDF

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Publication number
EP0294261A1
EP0294261A1 EP88401193A EP88401193A EP0294261A1 EP 0294261 A1 EP0294261 A1 EP 0294261A1 EP 88401193 A EP88401193 A EP 88401193A EP 88401193 A EP88401193 A EP 88401193A EP 0294261 A1 EP0294261 A1 EP 0294261A1
Authority
EP
European Patent Office
Prior art keywords
slots
network
holes
dough
ceramic
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Withdrawn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
EP88401193A
Other languages
German (de)
English (en)
French (fr)
Inventor
Charles Bilhere-Dieuzede
Jacques Noel
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
Original Assignee
Ceramiques et Composites SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ceramiques et Composites SA filed Critical Ceramiques et Composites SA
Publication of EP0294261A1 publication Critical patent/EP0294261A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B28B3/269—For multi-channeled structures, e.g. honeycomb structures

Definitions

  • the present invention relates to a device for extruding honeycomb structures of ceramic material and more particularly to a device intended for the extrusion of such structures with very thin walls (of a few tenths of a millimeter) with a relatively large mesh (cells having one side at least one millimeter).
  • a monobloc tool consisting of a network of holes drilled for example in a steel block and opening into a network of intersecting slots and forming the cellular ceramic itself, when the dough crosses the tool.
  • This difficulty can be due to multiple reasons: - the dough may lack plasticity, - The friction of the dough on the walls, which is at the origin of the lateral spreading of the dough and facilitates the formation of the cross of the profile, may be insufficient.
  • the subject of the present invention is the production of a cellular ceramic extrusion device which does not have these drawbacks.
  • the device according to the invention intended for the extrusion of honeycomb structures of ceramic material, of the kind consisting of a block in which is pierced a network of ceramic paste inlet holes, these opening into a network of slots intersecting and forming the honeycomb structure when the dough is extruded through the block is characterized in that most of the inlet holes are arranged directly above the slots, outside the intersections of the slots and in that the distribution of these holes is such that the widths of the ribbons of dough extruded from each of them are substantially equal.
  • This arrangement of the holes allows great flexibility of manufacture depending on the design of the structure to be produced.
  • the network of slots forms polygonal, preferably quadrangular, meshes.
  • the network of slots forms triangular meshes.
  • the network of slots consists of concentric circles and radii or parts of radii of these circles.
  • FIGS. 1 to 4 schematically illustrate embodiments of the extrusion device according to the invention and more particularly the relative arrangement of the dough inlet holes and the outlet slots thereof, in an extrusion tool, in partial view from above.
  • the honeycomb structure has a square mesh.
  • the top view shows, in solid lines, the dough inlet holes 10 and, in broken lines, the network of dough outlet slots 11, corresponding to the design of the honeycomb structure.
  • the entry lips of these slots naturally appear in solid lines, at 12, at the bottom of each of the holes.
  • the holes 10 are not arranged, as is usually the case, directly above the intersections 13 of the slots, but, symmetrically with respect to these slots, outside the intersections.
  • the holes 10 are distributed so that the dough leaving the holes in the form of cylinders is distributed in the slots along the paths indicated by the arrows in ribbons of equal or substantially equal widths.
  • the holes 10 are arranged outside the intersections 13 and, here again, the distribution of these holes is such that the widths of the ribbons extruded in the slots between holes, remain close to each other. other.
  • Figure 3 corresponds to a network of rectangular mesh slots. To keep the width of the slots between the holes 10 substantially constant, two of these holes are arranged on the longest side of the rectangle and only one on the short side.
  • the slots 11 form concentric circles 11a and spokes 11b of these circles; the holes are arranged in a distribution ensuring a width substantially equal to the ribbons of dough extruded into these slots, from each of the holes, these being arranged for the most part outside of intersections 13. However, some of the holes, designated by 10a , are arranged on intersections 13 to optimize the distribution.
  • the device according to the invention makes it possible to significantly increase the possibilities offered to ceramists for manufacturing alveolar profiles of very varied pitch and shape.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP88401193A 1987-05-20 1988-05-18 Dispositif d'extrusion de structures alvéolaires en matériau céramique Withdrawn EP0294261A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8707038A FR2615437A1 (fr) 1987-05-20 1987-05-20 Dispositif d'extrusion de structures alveolaires en materiau ceramique
FR8707038 1987-05-20

Publications (1)

Publication Number Publication Date
EP0294261A1 true EP0294261A1 (fr) 1988-12-07

Family

ID=9351251

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401193A Withdrawn EP0294261A1 (fr) 1987-05-20 1988-05-18 Dispositif d'extrusion de structures alvéolaires en matériau céramique

Country Status (13)

Country Link
EP (1) EP0294261A1 (da)
JP (1) JPS6453808A (da)
KR (1) KR880013667A (da)
CN (1) CN88102966A (da)
AU (1) AU1588088A (da)
BR (1) BR8802414A (da)
DK (1) DK274088A (da)
FI (1) FI882373A (da)
FR (1) FR2615437A1 (da)
IL (1) IL86427A0 (da)
NO (1) NO882163L (da)
PT (1) PT87531A (da)
ZA (1) ZA883310B (da)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6434753B2 (ja) * 2014-09-08 2018-12-05 イビデン株式会社 押出成形用金型

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178145A (en) * 1976-04-26 1979-12-11 Kyoto Ceramic Co., Ltd. Extrusion die for ceramic honeycomb structures
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
EP0027252A1 (fr) * 1979-10-15 1981-04-22 CERAVER Société anonyme dite: Dispositif pour la fabrication de corps à structure alvéolaire par extrusion d'une matière céramique, et procédé de fabrication dudit dispositif

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178145A (en) * 1976-04-26 1979-12-11 Kyoto Ceramic Co., Ltd. Extrusion die for ceramic honeycomb structures
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
EP0027252A1 (fr) * 1979-10-15 1981-04-22 CERAVER Société anonyme dite: Dispositif pour la fabrication de corps à structure alvéolaire par extrusion d'une matière céramique, et procédé de fabrication dudit dispositif

Also Published As

Publication number Publication date
BR8802414A (pt) 1988-12-13
KR880013667A (ko) 1988-12-21
CN88102966A (zh) 1988-12-28
FR2615437A1 (fr) 1988-11-25
DK274088D0 (da) 1988-05-19
DK274088A (da) 1988-11-21
NO882163L (no) 1988-11-21
NO882163D0 (no) 1988-05-18
PT87531A (pt) 1989-05-31
JPS6453808A (en) 1989-03-01
FI882373A (fi) 1988-11-21
AU1588088A (en) 1988-11-24
ZA883310B (en) 1988-11-14
FI882373A0 (fi) 1988-05-19
IL86427A0 (en) 1988-11-15

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