EP0374821A2 - Matrice d'extrusion pour la fabrication d'éléments céramiques à structure en nid d'abeilles - Google Patents

Matrice d'extrusion pour la fabrication d'éléments céramiques à structure en nid d'abeilles Download PDF

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Publication number
EP0374821A2
EP0374821A2 EP89123441A EP89123441A EP0374821A2 EP 0374821 A2 EP0374821 A2 EP 0374821A2 EP 89123441 A EP89123441 A EP 89123441A EP 89123441 A EP89123441 A EP 89123441A EP 0374821 A2 EP0374821 A2 EP 0374821A2
Authority
EP
European Patent Office
Prior art keywords
feed channels
core elements
mold block
extrusion die
outlet slots
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Withdrawn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
EP89123441A
Other languages
German (de)
English (en)
Other versions
EP0374821A3 (fr
Inventor
Klaus Dr. Dieterle
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP0374821A2 publication Critical patent/EP0374821A2/fr
Publication of EP0374821A3 publication Critical patent/EP0374821A3/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Withdrawn legal-status Critical Current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
    • B28B3/26—Extrusion dies
    • B28B3/269—For multi-channeled structures, e.g. honeycomb structures

Definitions

  • a known extrusion die in the sense of DE-PS 22 54 563 was used in the preamble of claim 1, with which ceramic material was previously extruded into uniform honeycomb bodies with a uniform wall thickness.
  • This extrusion die consists of a mold block, in the opposite end faces of which on the one hand feed channels and on the other hand outlet slots are provided. In relation to the outlet slots, the feed channels are arranged such that the inner end of the feed channels is connected to the inner end of a crossing point of two outlet slots.
  • the transition area between the feed channels and the outlet slots is difficult to access, so that there are practically no possibilities for improving the flow conditions.
  • the ceramic material arriving in the form of many individual strands must be distributed uniformly to the outlet slots by cross flows, i.e. the primarily formed strand structure is completely dissolved.
  • the known extrusion die has relatively short flow paths. However, this requires higher pressures in order to achieve a uniform flow of the ceramic material.
  • feed channels, outlet slots and the delivery unit are exposed to high wear under these conditions.
  • the manufacture of such an extrusion die is comparatively complex since sawing the narrow slots and, above all, the necessary deburring of the shaped bodies causes problems.
  • the invention is based on a mold block with feed channels parallel to one another and passing through from one mold block surface to an opposite mold block surface.
  • Core elements are placed on a mold block surface between the feed channels.
  • the core elements are at least approximately in the center of gravity between three or four or more feed channels, so that there is an overall symmetrical arrangement of the core elements both with each other and in relation to the feed channels.
  • Core elements leaving outlet slots can also be inserted into corresponding bores between the feed channels and connected to the mold block. They are aligned - for example with the aid of a template, mask or the like - in such a way that in each case a feed channel is connected to a crossing point of at least two outlet slots.
  • profile bars such as triangular, square, hexagonal or round steel, which are cut to length, are particularly suitable for producing the core elements.
  • dowel pins are screwed on, the dowel pin length can be limited by a preferably rectangular shoulder to make assembly easier and to increase the bending stiffness of the core elements.
  • the transition region lying between this shoulder and the shaping region can be designed in a simple manner in terms of flow, since the core elements are each manufactured independently of one another. This ensures that the outlet slots and, in particular, their crossing points can be flowed through symmetrically and any inhomogeneities of the ceramic material that are present can be easily compensated for by cross flow.
  • the extrusion die consists of easily manufactured individual parts.
  • the form block only contains holes.
  • the core elements are simple turned parts; they are easy to assemble and disassemble.
  • Your material or non-positive connection with the mold block can be by adhesive techniques or by thermal joining processes, e.g. Soldering, welding, preferably done by an interference fit.
  • the core elements are detachably connected to the mold block.
  • the bores in the mold block are designed as threaded bores and the core elements are provided with an axial bore instead of a dowel pin.
  • individual core elements of an extrusion die can also be replaced if necessary.
  • the extrusion die essentially consists of a mold block (1), in which feed channels (2) are provided which are parallel to one another and pass through from a mold block surface to the mold block surface lying above it.
  • the feed channels as a whole are mounted in such a way that the distance between adjacent feed channels is the same in two mutually perpendicular planes.
  • holes (9) are formed in a mold block surface for receiving core elements (3).
  • a core element is fastened in the center between four feed channels.
  • the core elements result in grid-shaped outlet slots (4) on the so-called outlet side of the extrusion die.
  • the core elements (3) have a square head part (5) at one end, a dowel pin (6) at the other end and a conical transition part (8) between the head part and dowel pin. With (7) is a shoulder at right angles between the dowel pin and transition part.
  • the bores in the mold block (1) are designed as threaded bores (9 ') and the core elements (3') are connected to the mold block by means of an Allen screw (10).
  • An endless strand is generally extruded to produce the honeycomb bodies.
  • the ceramic material is fed from the inlet side of the extrusion die via the feed channels (2) to the shaping outlet slots (4).
  • the outer boundary of the outlet slots can be formed by profile bars (not shown in the drawing).
  • the strand structure is dissolved, i.e. the strands of material emerging from the feed channels flow together before reaching the outlet slots.
  • the length of the transition part (8) of the core elements represents a measure of the transverse flow of the ceramic material in this area.
  • a strand-like body with a particularly uniform honeycomb structure emerges from the outlet slots.

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)
EP89123441A 1988-12-23 1989-12-19 Matrice d'extrusion pour la fabrication d'éléments céramiques à structure en nid d'abeilles Withdrawn EP0374821A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883843388 DE3843388A1 (de) 1988-12-23 1988-12-23 Strangpressduese zum extrudieren keramischer koerper mit wabenartiger struktur
DE3843388 1988-12-23

Publications (2)

Publication Number Publication Date
EP0374821A2 true EP0374821A2 (fr) 1990-06-27
EP0374821A3 EP0374821A3 (fr) 1990-08-08

Family

ID=6369944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89123441A Withdrawn EP0374821A3 (fr) 1988-12-23 1989-12-19 Matrice d'extrusion pour la fabrication d'éléments céramiques à structure en nid d'abeilles

Country Status (2)

Country Link
EP (1) EP0374821A3 (fr)
DE (1) DE3843388A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0414411A3 (en) * 1989-08-24 1991-07-31 General Motors Corporation Extrusion die construction and its method of manufacture
EP0414410A3 (en) * 1989-08-24 1991-08-07 General Motors Corporation Method for manufacturing a die for extruding honeycomb material
EP0776744A1 (fr) * 1995-11-30 1997-06-04 Corning Incorporated Matrice d'extrusion à tenons rapportés et méthode pour son obtention
ES2190358A1 (es) * 2001-09-11 2003-07-16 Torres Dang S L Sistema de union entre camisa y tacos para molde de fabricacion de ladrillos por extrusion.
DE102012223349B4 (de) * 2011-12-21 2020-10-01 Nanostone Water Gmbh Mundstück eines Extruders zur Herstellung mindestens eines Formkörpers
US11034052B2 (en) 2015-03-13 2021-06-15 Nanostone Water Gmbh Mouthpiece for extruding a molding compound into a formed body, and method for producing a mouthpiece of this type

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1725959A (en) * 1929-08-27 Extruding bib
GB810924A (en) * 1956-04-09 1959-03-25 Rudolph Wolfe Miller Improvements in or relating to making multiple tube structure by extrusion and apparatus therefor
DE1584324A1 (de) * 1965-04-15 1969-12-18 Schneider & Co Vorrichtung zur Herstellung keramischer Koerper
DE1268037B (de) * 1965-04-15 1968-05-09 Fetok Gmbh Pressenmundstueck zur Herstellung von doppelwandigen Rohren aus keramischem Material
JPS5951402B2 (ja) * 1977-05-04 1984-12-13 日本碍子株式会社 ハニカム成型用ダイス
DE3715710A1 (de) * 1987-05-12 1988-12-08 Rennebeck Klaus Formgebungswerkzeug zur hohlkoerper-wabenscherbenherstellung mit nachbesserbaren formgebungsstempeln und austauschbaren formgebungsstempeln in lochplatte

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0414411A3 (en) * 1989-08-24 1991-07-31 General Motors Corporation Extrusion die construction and its method of manufacture
EP0414410A3 (en) * 1989-08-24 1991-08-07 General Motors Corporation Method for manufacturing a die for extruding honeycomb material
EP0776744A1 (fr) * 1995-11-30 1997-06-04 Corning Incorporated Matrice d'extrusion à tenons rapportés et méthode pour son obtention
US5761787A (en) * 1995-11-30 1998-06-09 Corning Incorporated Method of making bonded pin extrusion die
US5964020A (en) * 1995-11-30 1999-10-12 Corning Incorporated Bonded pin extrusion die and method
ES2190358A1 (es) * 2001-09-11 2003-07-16 Torres Dang S L Sistema de union entre camisa y tacos para molde de fabricacion de ladrillos por extrusion.
DE102012223349B4 (de) * 2011-12-21 2020-10-01 Nanostone Water Gmbh Mundstück eines Extruders zur Herstellung mindestens eines Formkörpers
US11034052B2 (en) 2015-03-13 2021-06-15 Nanostone Water Gmbh Mouthpiece for extruding a molding compound into a formed body, and method for producing a mouthpiece of this type
US11712817B2 (en) 2015-03-13 2023-08-01 Nanostone Water Gmbh Mouthpiece for extruding a molding compound into a formed body, and method for producing a mouthpiece of this type

Also Published As

Publication number Publication date
EP0374821A3 (fr) 1990-08-08
DE3843388A1 (de) 1990-06-28

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