EP0364205A2 - Dispositif pour préparer des blocs de matériau et méthode de moulage de produits céramiques utilisant ce dispositif - Google Patents

Dispositif pour préparer des blocs de matériau et méthode de moulage de produits céramiques utilisant ce dispositif Download PDF

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Publication number
EP0364205A2
EP0364205A2 EP89310335A EP89310335A EP0364205A2 EP 0364205 A2 EP0364205 A2 EP 0364205A2 EP 89310335 A EP89310335 A EP 89310335A EP 89310335 A EP89310335 A EP 89310335A EP 0364205 A2 EP0364205 A2 EP 0364205A2
Authority
EP
European Patent Office
Prior art keywords
bodies
molding
refining
tapered
perforated plate
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Withdrawn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
EP89310335A
Other languages
German (de)
English (en)
Other versions
EP0364205A3 (fr
Inventor
Kiminari 1-302 Town Denjiyama 1-2 Kato
Kenichi 48-2 Aza-Ohyashiki Tanaka
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.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
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 NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of EP0364205A2 publication Critical patent/EP0364205A2/fr
Publication of EP0364205A3 publication Critical patent/EP0364205A3/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Withdrawn legal-status Critical Current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
    • B28B3/206—Forcing the material through screens or slots
    • 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
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/02—Conditioning the material prior to shaping
    • B28B17/026—Conditioning ceramic materials
    • 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
    • B28B3/24—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by reciprocating plunger

Definitions

  • the present invention relates to an apparatus for refining moldable ceramic batch bodies or the like and method of extrusion or injection molding ceramic green bodies by using such a refining apparatus.
  • an extrusion molding apparatus for molding ceramic green bodies has been known as disclosed in U.S. Patent No. 3,888,963 as an example.
  • Such an extrusion molding apparatus is illustrated in Fig. 4 by a sectional view and comprises an extrusion cylinder 19 having a plunger 20 movable within an extrusion chamber 26 in which a flow homogenizer assembly 22 is provided upstream of an extrusion die 21 in order to refine and homogenize a batch body to provide ceramic green bodies having no faults.
  • the homogenizer assembly 22 comprises a screen 23 and a screen supporting plate 24 which is positioned downstream of the screen and provided with a plurality of passages 25 extending therethrough. Each passage 25 is chamfered at its inlet end.
  • an apparatus for refining moldable batch bodies is provided within a molding cylinder upstream of a molding die for molding ceramic green bodies.
  • the apparatus comprises a screen and a screen supporting perforated plate having a plurality of body passages extending therethrough. Each body passage is tapered to diverge towards a body chamber defined between the molding die and the perforated plate.
  • a method of molding ceramic bodies is characterized in that a moldable batch body is extrusion or injection molded by use of the apparatus for refining the moldable batch body comprising a screen and a screen supporting perforated plate having a plurality of body passages tapered to diverge towards a body chamber defined between a molding die and the perforated plate.
  • the screen effects to remove foreign matters included in the batch body.
  • the perforated plate is necessary for supporting the screen since the screen has a low mechanical strength itself.
  • the body passages in the perforated plate are tapered to diverge towards the body chamber and as a result the batch body is extruded in the form of noodles through the body passages along the tapered inner surface of the body passages to generate a component of force in the direction perpendicular to the extrusion direction so that the noodles extruded from the body passages into the body chamber are pressed and united to each other.
  • the screen preferably has a size of mesh as small as possible in order to remove the fine foreign matters included in the batch body and the size of mesh may be selected in corresponding to the kind of the batch body.
  • the taper angle of the tapered body passages may be 150 ⁇ 3°, preferably 90 ⁇ 10°. If the taper angle is larger than 150° or smaller than 3°, the component of force in the direction perpendicular to the extrusion direction may be small, respectively, so that an inter­face including voids and the other faults will be formed between the adjacent noodles, Moreover, it is preferivelyable that the adjacent tapered body passages are overlapped to each other at the outlet end on the side of the molding die as shown in Fig. 2a in order to improve the pressing of noodles or unoverlapped flat regions 9-2 in Fig. 2b is less than 30%, preferably 10% of the total area of the tapered regions and flat regions. If the unoverlapped regions are larger than 30%, clearances may occur between the adjacent noodles resulting in interfaces including faults.
  • an extru­sion molding cylinder 1 includes a plunger 10 movable in the axial direction thereof and a homogenizing assembly 4 fixed at an open end of the extrusion cylinder 1 which is connected to a cylindrical side wall 6 defining a body chamber 5.
  • the homogenizer assembly 4 for refining and homogenizing a batch body comprises a screen 2 of Tyler Standard screen scale 80 for removing foreign matters and a perforated plate 3 for supporting and reinforcing the screen 2 and is interposed between the extrusion cylinder 1 and one end of the cylindrical side wall 6.
  • the per­forated plate 3 has a plurality of body passages 9 extending therethrough. Each body passage 9 is tapered at the outlet portion on the side of the body chamber 5 to diverge towards the body chamber.
  • Figs. 2a and2b are bottom views of different embodiments of perforated plate 3 according to the present invention taken in a direction shown by an arrow A in Fig. 1.
  • each body passage 9 is tapered in all portion thereof to provide a tapered region 9-1.
  • each body passage has a tapered region 9-1 similar to Fig. 2a and a flat region 9-2.
  • Fig. 3 is a sectional view of the perforated plate 3 illustrating the configuration of the body passages and their tapered regions.
  • An extrusion molding machine was provided with the refining apparatus shown in Fig. 1 with the perforated plate shown in Fig. 3.
  • Batch bodies having a chemical composition consisting of silicon nitride, silicon carbide and the like were loaded within the extruding cylinder 1 and extruded by means of the plunger 10. Foreign matters included in the extruded batch bodies were removed by the screen 2 of Tyler Standard screen scale 80.
  • Each batch body was continuously fed in the form of a plurality of noodles into the body chamber 5 through the body passages 9 in the perforated plate 3 and after compacted the batch body was molded through the molding die 8 to a green body of predetermined shape.
  • the yield of green bodies extruded by the extrusion molding machine according to the present invention was as high as 98% and faults were scarcely occurred.
  • the yield of green bodies extruded by the conventional extrusion molding machine as shown in Fig. 4 was as low as 30% and faults of 0.2 ⁇ 5 mm caused by unsufficient pressing between adjacent noodles were detected in an amount of one to fifteen per each green body.
  • the present invention also was applied to an injection molding machine and obtained similar effects.
  • the batch bodies are refined through the screen to remove the foreign matters included in the batch bodies and the noodles are passed through the body passages diverging towards the body chamber to thereby be pressed together to be united without formation of interfaces and as a result high reliable molded green bodies having no faults are obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP19890310335 1988-10-11 1989-10-10 Dispositif pour préparer des blocs de matériau et méthode de moulage de produits céramiques utilisant ce dispositif Withdrawn EP0364205A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP253836/88 1988-10-11
JP25383688A JPH02102005A (ja) 1988-10-11 1988-10-11 成形材料精製装置およびそれを使用したセラミック成形方法

Publications (2)

Publication Number Publication Date
EP0364205A2 true EP0364205A2 (fr) 1990-04-18
EP0364205A3 EP0364205A3 (fr) 1990-12-05

Family

ID=17256810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890310335 Withdrawn EP0364205A3 (fr) 1988-10-11 1989-10-10 Dispositif pour préparer des blocs de matériau et méthode de moulage de produits céramiques utilisant ce dispositif

Country Status (2)

Country Link
EP (1) EP0364205A3 (fr)
JP (1) JPH02102005A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096075A3 (fr) * 2000-06-10 2002-03-14 Service Engineers Plc Fabrication de anses en argile
WO2007070005A1 (fr) * 2005-12-13 2007-06-21 Agency For Science, Technology & Research Procede et appareil pour le formage par extrusion-injection

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE568195C (de) * 1930-03-25 1933-01-16 Porzellanfabrik Kahla Vorrichtung zum maschinellen Herstellen von Massestraengen aus plastischen, insbesondere feinkeramischen Massen
FR768828A (fr) * 1933-02-18 1934-08-14 Richard Raupach Maschinenfabri Procédé et dispositif d'extraction de l'air contenu dans des masses plastiques, notamment des masses céramiques traitées dans des presses telles que des presses à boudiner
CH179005A (de) * 1934-12-08 1935-08-31 Duerst Emanuel Verfahren zur Behandlung von knetbarem Pressmaterial in Strangpressen, welche mit einem Entgasungsraum ausgestattet sind, und Strangpresse zur Durchführung des Verfahrens.
DE852974C (de) * 1951-05-24 1952-10-20 August Hess Soehne Inhaber Hei Vakuum-Filterpresse zum Aufbereiten von keramischer Masse
DE909193C (de) * 1952-09-02 1954-04-15 Siemens Ag Strangpresse fuer die Herstellung von Hohlkoerpern aus bildsamen keramischen Massen od. dgl.
FR1123090A (fr) * 1954-05-03 1956-09-17 Buehler Ag Geb Presse à vis d'archimède avec dispositif sous vide pour le travail de masses plastiques, en particulier dans l'industrie de la tuilerie
DE1629734A1 (de) * 1967-12-04 1971-02-04 Huels Chemische Werke Ag Strangpressanlage zur besseren Homogenisierung warmplastischer Kunststoffe
US3792839A (en) * 1971-08-23 1974-02-19 Polysar Ltd Device for the injection of fluid foaming agents into plasticized polymeric material
US3888963A (en) * 1973-09-18 1975-06-10 Corning Glass Works In-line homogenizing of extrudable ceramic batch materials
GB8709445D0 (en) * 1987-04-21 1987-05-28 Bush S F Fibre separating device
DE8706926U1 (de) * 1987-05-14 1987-07-23 Gneuß Kunststofftechnik GmbH, 4970 Bad Oeynhausen Statisches Misch- und Scherelement für Kunststoffe und Kautschuk

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096075A3 (fr) * 2000-06-10 2002-03-14 Service Engineers Plc Fabrication de anses en argile
WO2007070005A1 (fr) * 2005-12-13 2007-06-21 Agency For Science, Technology & Research Procede et appareil pour le formage par extrusion-injection

Also Published As

Publication number Publication date
JPH02102005A (ja) 1990-04-13
EP0364205A3 (fr) 1990-12-05

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