EP0563577B2 - Verfahren und Vorrichtung zum Herstellen keramischer Formlinge aus rieselfähiger Masse - Google Patents

Verfahren und Vorrichtung zum Herstellen keramischer Formlinge aus rieselfähiger Masse Download PDF

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Publication number
EP0563577B2
EP0563577B2 EP93103028A EP93103028A EP0563577B2 EP 0563577 B2 EP0563577 B2 EP 0563577B2 EP 93103028 A EP93103028 A EP 93103028A EP 93103028 A EP93103028 A EP 93103028A EP 0563577 B2 EP0563577 B2 EP 0563577B2
Authority
EP
European Patent Office
Prior art keywords
exhaust aperture
tool part
membrane
adjustable
adjustment
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
EP93103028A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0563577B1 (de
EP0563577A1 (de
Inventor
Arnold Reger
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.)
Erich Netzsch GmbH and Co Holding KG
Original Assignee
Erich Netzsch GmbH and Co Holding KG
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
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Application filed by Erich Netzsch GmbH and Co Holding KG filed Critical Erich Netzsch GmbH and Co Holding KG
Publication of EP0563577A1 publication Critical patent/EP0563577A1/de
Application granted granted Critical
Publication of EP0563577B1 publication Critical patent/EP0563577B1/de
Publication of EP0563577B2 publication Critical patent/EP0563577B2/de
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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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0002—Auxiliary parts or elements of the mould
    • B28B7/0008—Venting channels, e.g. to avoid vacuum during demoulding or allowing air to escape during feeding, pressing or moulding
    • 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
    • B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
    • 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/44—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for treating with gases or degassing, e.g. for de-aerating

Definitions

  • the invention relates to a method for manufacturing ceramic moldings from a free-flowing mass delimit a mold cavity between at least two Tool parts, being between the coating on the first tool part and the membrane on the second tool part Mass over a filling channel under pressure in the Mold cavity is inserted and the supplied and Air to be displaced escapes through a ventilation gap.
  • the invention further relates to a device for manufacturing of moldings from a free-flowing mass according to the preamble features of independent claim 4.
  • DE-A-31 describes how to carry out such a method 28 347 a press became known in which the pourable mass over a shooting head in the front of the Filling process evacuated shooting chamber arrives at the same time Mold cavity is.
  • air is sucked out through an annular gap that axially between the upper die and the locking ring and in the vacuum line of the lock ring passes, at which a vacuum generator with machine-controlled Valve connects.
  • the lock ring and the die stamp for one or more pre-pressings are realistically movable to each other, the Annular gap not specifically aimed at different gap widths to adjust.
  • the object of the invention is therefore a method and a device for producing ceramic moldings to propose the venting of the Mold cavity and thus the setting of the ventilation gap to different requirements regarding of the end product or those to be processed free-flowing mass is adjustable.
  • the granulate is injected with compressed air to fill the mold cavity.
  • the compressed air used as a means of transport escapes over the ventilation gap into an outside of the actual Mold cavity for the ceramic molding arranged in a ring Ventilation duct.
  • the ventilation gap is normally set to a passage of 0.3 mm.
  • the same procedure may be necessary if the granules are due to low moisture or smoother Surface has an increased flowability and thus also tends to be in an undesirable amount through the vent to resign.
  • the ventilation is always optimally adjusted to the granulate to strive for as it directly affects the length of the Has time to fill the mold cavity and also the quality of the article. This means that the ventilation gap is too small e.g. lead to air pockets in the article, with cracks in the foot area or deposits in the area of the board occur. On the other hand If the ventilation gap is too large, a unevenly filled mold cavity and thus uneven Item thicknesses result.
  • the device according to the invention also enables the support of the membrane back for adjustment to adjust the body thickness axially without doing so as before the vent gap is affected. If you put the support back by 1 mm to get a larger mold cavity so can the ring-shaped adjustable insert on the support part be put forward by this measure. So that is ensures that the optimally determined and set Do not change the conditions at the ventilation gap. At the same time this allows the lower part of the isostatic press tool for use the production of further moldings, provided that these have the same contour on the underside of the molding. With standardized Articles, e.g.
  • this adjustment process also automatically - without Disassembly of the membrane tool part - can be done by the position of the membrane or the coating in the ventilation gap area by means of a hydraulic or functionally equivalent Unit corrected to the corresponding setting value.
  • a pulse generator for changing the ventilation gap can e.g. Initiators are provided in the vent line be by knowing or rather not knowing leakage of mass onto an insufficiently filled mold cavity point out and thus cause a ventilation gap correction.
  • the closure for the filling channel is formed by a filling slide 38 prevents mass from entering the filling channel during the pressing process pushed back and compressed. Because there is air in with the mass reaches the mold cavity 32, this air must be given a possibility to escape.
  • This ventilation gap 40 is located between the outer edge of the membrane 18 and the coating 16 and merges into one or more ventilation channels.
  • the composition of the mass etc. is the supporting part 24 provided with an insert 42 in the form of a threaded ring. In interaction with the external thread on the support part 24 the membrane 18 is raised if necessary and the ventilation gap narrowed. As a safeguard against independent twisting in use 42 several screws 44 used.
  • the venting gap 40 is also separated from the Diaphragm side set.
  • the annular insert 54 lies with its downward sloping surface 56 on a radially movable to the support member 24 wedge 58.
  • the likewise ring-shaped or, as in FIG. 5, segment-shaped wedge 58 lifts the insert 54, as can be seen here, by screwing in the Screw 60.

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)
EP93103028A 1992-03-30 1993-02-25 Verfahren und Vorrichtung zum Herstellen keramischer Formlinge aus rieselfähiger Masse Expired - Lifetime EP0563577B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4210337A DE4210337C1 (enrdf_load_stackoverflow) 1992-03-30 1992-03-30
DE4210337 1992-03-30

Publications (3)

Publication Number Publication Date
EP0563577A1 EP0563577A1 (de) 1993-10-06
EP0563577B1 EP0563577B1 (de) 1996-02-14
EP0563577B2 true EP0563577B2 (de) 2000-06-21

Family

ID=6455391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93103028A Expired - Lifetime EP0563577B2 (de) 1992-03-30 1993-02-25 Verfahren und Vorrichtung zum Herstellen keramischer Formlinge aus rieselfähiger Masse

Country Status (3)

Country Link
EP (1) EP0563577B2 (enrdf_load_stackoverflow)
DE (2) DE4210337C1 (enrdf_load_stackoverflow)
ES (1) ES2084402T5 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1990165A2 (de) 2007-05-10 2008-11-12 Dorst Technologies GmbH & Co. KG Pressenanordnung mit einer Pressform bzw. Pressform zum Pressen von Pressgut zu einem Artikel

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0689914A1 (de) * 1994-06-29 1996-01-03 WILHELM SÖNDGEN GmbH Verfahren zur serienmässigen Herstellung von Hohlgefässen aus Keramik
DE19600976C2 (de) * 1995-01-25 1999-09-30 Thuringia Netzsch Feinkeramik Verfahren und Einrichtungen zum Beschicken eines Preßwerkzeugs mit rieselfähiger Masse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593373A (en) * 1968-09-26 1971-07-20 David G Loomis Molding apparatus
DE3128347A1 (de) * 1981-07-17 1983-02-03 Eugen Dipl.-Ing. 8871 Burtenbach Bühler Verfahren und einrichtung zur herstellung von formlingen aus rieselfaehiger masse stichwort: "beibehaltung des fuellvakuums beim isostatischen pressen"
DE3239815A1 (de) * 1982-10-27 1984-05-03 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Presswerkzeug zum isostatischen pressen keramischer formlinge
DE3512852A1 (de) * 1985-04-10 1986-10-16 Dorst - Maschinen- und Anlagen-Bau Otto Dorst u. Dipl. Ing. Walter Schlegel GmbH & Co, 8113 Kochel Presswerkzeug zur herstellung von schalenfoermigen presskoerpern, insbesondere platten, tellern, bechern, schuesseln od.dgl. aus pulverfoermigem, vorzugsweise keramischen material
DE3636736C1 (en) * 1986-10-29 1988-02-18 Laeis Gmbh Pressing mould, especially for ceramic moulded parts

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1990165A2 (de) 2007-05-10 2008-11-12 Dorst Technologies GmbH & Co. KG Pressenanordnung mit einer Pressform bzw. Pressform zum Pressen von Pressgut zu einem Artikel
DE102007021898A1 (de) 2007-05-10 2008-11-13 Dorst Technologies Gmbh & Co. Kg Pressenanordnung mit einer Pressenform bzw. Pressenform zum Pressen von Pressgut zu einem Artikel
EP1990165A3 (de) * 2007-05-10 2012-11-21 Dorst Technologies GmbH & Co. KG Pressenanordnung mit einer Pressform bzw. Pressform zum Pressen von Pressgut zu einem Artikel
DE102007021898B4 (de) 2007-05-10 2019-05-02 Dorst Technologies Gmbh & Co. Kg Pressenanordnung mit einer Pressenform bzw. Pressenform zum Pressen von Pressgut zu einem Artikel

Also Published As

Publication number Publication date
ES2084402T3 (es) 1996-05-01
EP0563577B1 (de) 1996-02-14
DE59301613D1 (de) 1996-03-28
DE4210337C1 (enrdf_load_stackoverflow) 1993-07-22
EP0563577A1 (de) 1993-10-06
ES2084402T5 (es) 2000-12-01

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