EP0440965A2 - Procédé et dispositif pour la fabrication d'ébauches de céramique en forme de bol - Google Patents

Procédé et dispositif pour la fabrication d'ébauches de céramique en forme de bol Download PDF

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Publication number
EP0440965A2
EP0440965A2 EP90125051A EP90125051A EP0440965A2 EP 0440965 A2 EP0440965 A2 EP 0440965A2 EP 90125051 A EP90125051 A EP 90125051A EP 90125051 A EP90125051 A EP 90125051A EP 0440965 A2 EP0440965 A2 EP 0440965A2
Authority
EP
European Patent Office
Prior art keywords
rim
pressed
axis
moldings
grinding
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.)
Granted
Application number
EP90125051A
Other languages
German (de)
English (en)
Other versions
EP0440965B1 (fr
EP0440965A3 (en
Inventor
Günther Dipl.-Ing. Söthje
Karl-Heinz Sack
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
Application filed by Erich Netzsch GmbH and Co Holding KG filed Critical Erich Netzsch GmbH and Co Holding KG
Publication of EP0440965A2 publication Critical patent/EP0440965A2/fr
Publication of EP0440965A3 publication Critical patent/EP0440965A3/de
Application granted granted Critical
Publication of EP0440965B1 publication Critical patent/EP0440965B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/18—Apparatus or processes for treating or working the shaped or preshaped articles for removing burr
    • 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

Definitions

  • the invention relates to a method for producing bowl-shaped ceramic moldings with a steep wall and a flange edge lying in one plane, by isostatic pressing of the ceramic granulate moldings, a burr forming radially beyond the rim of the rim, and grinding the burr.
  • a ridge always forms when pressing ceramic moldings, which must then be removed.
  • the ridge In the usual design of the devices for isostatic pressing of ceramic moldings with a flat rim (DD 153087), the ridge extends radially outwards in the plane of the rim.
  • at least one cleaning tool is required, which is placed obliquely against the edge of the rim, while the molding is rotated about its own axis.
  • a rotating grinding wheel is usually used as the cleaning tool, the axis of rotation of which is arranged at a distance perpendicular to the axis of rotation of the molding (DE 3150431 A1) or the axis of rotation of the molding cuts at an acute angle (DE 3429280 C1).
  • the invention is therefore based on the object of developing a method of the type described in the introduction in such a way that the contour of the moldings does not require any special attention when cleaning.
  • the object is achieved in that the moldings are pressed with an annular attachment which extends in extension of the steep wall beyond the rim and has an end face remote from the rim, from which the ridge is radial extends outwards, and the pressed moldings, while they are rotated about their axis, are pressed with the end face of their attachment against a rectilinearly moved grinding surface until the attachment is ground off.
  • each molding is reliably freed from the burr before there is even the slightest risk that something could be removed from the rim itself.
  • it is harmless if the molding axis is offset slightly parallel to the axis of rotation.
  • the risk of damage is not appreciably greater on particularly strongly curved or even angular sections of the rim of the ship than on straight sections; as a result, the ring-shaped attachment according to the invention can generally be removed together with the burr in a time which is shorter than the time which was previously only required to remove the burr.
  • the device for pressing shown in part in FIGS. 1 and 2 has a first tool part 10, into which a die 12 and a membrane 14 are inserted, and on which a flat end face 16 is formed around an edge region of the membrane 14.
  • the die 12 contains at least one channel 18 through which a liquid can be introduced under pressure between the die 12 and the membrane 14.
  • the device for pressing further includes a second tool part 20 with a male part 22, which has a coating 24 made of one of the elastomers; this coating forms a flat, annular end face 26 which, in the illustrated closed position of the tool parts 10 and 20, bears tightly against the end face 16 of the first tool part 10.
  • a mold cavity 28 is formed, which can be filled with ceramic granules in the usual way through at least one end face 16 and 26 through at least one channel, not shown.
  • the mold cavity 28 determines the shape of a molding 30 to be pressed therein, which is shown in more detail in FIG. 4.
  • the molding 30 has a steep wall 32 and overall has a non-rotationally symmetrical, for example oval or rectangular, shape and a correspondingly non-round rim 34.
  • the steep wall 32 which is also shown in FIGS. 1 and 2, is followed by an annular attachment 36 of the molding 30 in its extension, which ends in a flat annular end face 38 distant from the rim 34.
  • the end face 38 also delimits in the axial direction a radially outwardly projecting ridge 40 which forms during the pressing.
  • the ring-shaped attachment 36 is an intermediate piece between the rim 34 and the ridge 40 which increases the overall height of the pressed but not yet processed molding 30.
  • the attachment 36 has a height of approximately the same size as the body thickness of the molding 30 in the region of Bordrandes 34 and a thickness which is about half as large as the body thickness.
  • annular attachment 36 is formed during the pressing, an additional annular space 42 is formed between the membrane 14 and the coating 24 of the male part 22, which separates the mold cavity 28 from the abutting end faces 16 and 26 and has the cross-sectional shape of a lying L.
  • the coating 24 has a step 44 at the level of the rim 34 of the molding 30, which ensures that the rim 34 already assumes its final shape when pressed to about half its width.
  • the device shown in FIGS. 3 and 4 is used to remove the annular attachment 36 from moldings 30 that have been pressed according to FIGS. 1 and 2 and then to smooth the rim 34.
  • the device has a vertical column 46 which can be rotated step by step about its axis A and can be raised and lowered along this axis.
  • Eight arms 48 protrude from the column 46 at regular angular intervals, each of which carries a holder 50 for a molding 30 at their free ends.
  • the brackets 50 can be driven in rotation about an axis B parallel to the axis A and are connected to a vacuum source in order to be able to suck up a molding 30 in each case.
  • one of the eight holders 50 stands above the end of a feed conveyor 52, the second above a grinding device 54, the third and seventh in an intermediate station 56, while the fourth, fifth and sixth holder 50 each above a sponge device 58 stand and the eighth bracket 50 stands above a discharge conveyor 60.
  • the grinder 54 has two horizontal, parallel deflection rollers 62, between which a flat support 64 which is adjustable in different heights and inclinations is arranged.
  • An endless grinding belt 66 runs over the deflection rollers 62 and the support 64, the upper side of which forms a flat, horizontal grinding surface 68.
  • the width of the grinding belt 66 is smaller than the largest diagonal dimension of the shaped articles 30 which are rectangular in the example shown.
  • the sponge devices 58 are designed similarly to the grinding device 54; they each have an endless sponge band 70 with a sponge surface 72, the width of which is, however, less than the width of the molded articles 30.
  • one of the holders 50 takes over a molding 30 from the feed conveyor 52.
  • This molding 30 is pressed against the grinding surface 68 of the rotating grinding belt 66 during the next working cycle until the annular attachment 36 together with the burr 40 removed and thereby the rim 34 is exposed.
  • the molding 30 plastered in this way reaches the three sponge devices 58 one after the other in the course of further working cycles, of which the rim 34 is smoothed and, if necessary, rounded off.
  • the finished plastered and spongy molding 30 is placed on the discharge conveyor 60.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP90125051A 1990-02-08 1990-12-20 Procédé et dispositif pour la fabrication d'ébauches de céramique en forme de bol Expired - Lifetime EP0440965B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4003816 1990-02-08
DE4003816A DE4003816C1 (fr) 1990-02-08 1990-02-08

Publications (3)

Publication Number Publication Date
EP0440965A2 true EP0440965A2 (fr) 1991-08-14
EP0440965A3 EP0440965A3 (en) 1991-11-21
EP0440965B1 EP0440965B1 (fr) 1994-05-18

Family

ID=6399715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125051A Expired - Lifetime EP0440965B1 (fr) 1990-02-08 1990-12-20 Procédé et dispositif pour la fabrication d'ébauches de céramique en forme de bol

Country Status (2)

Country Link
EP (1) EP0440965B1 (fr)
DE (2) DE4003816C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1162048A2 (fr) * 2000-06-07 2001-12-12 SAMA Maschinenbau GmbH Dispositif de polissage pour articles en céramique de formes quelconques

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE596319C (de) * 1932-06-05 1934-05-02 Porzellanfabrik F Thomas Glasurabputzvorrichtung
DE1910223A1 (de) * 1969-02-28 1970-09-17 Heinz Fladerer Maschine zum Bearbeiten von keramischen Koerpern
DE1683976A1 (de) * 1968-01-24 1971-03-04 Service Eng Ltd Vorrichtung zum Glaetten keramischer Hohlformlinge
FR2433400A1 (fr) * 1978-08-17 1980-03-14 Demag Kunststofftech Procede et dispositif de moulage par injection de pieces en matiere ceramique
GB2053886A (en) * 1979-07-06 1981-02-11 British Ceramic Res Ass Treating ceramic articles
GB2080725A (en) * 1980-07-25 1982-02-10 Netzsch Maschinenfabrik A method of producing plates having a festooned rim and tools for performing the method.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD153087A1 (de) * 1980-09-25 1981-12-23 Joachim Sauer Vorrichtung zum isostatischen pressen von keramischen gegenstaenden
DE3150431A1 (de) * 1981-12-19 1983-07-14 Maschinen- und Stahlbau Julius Lippert GmbH & Co, 8487 Pressath Putzmaschine fuer keramisches gut
DE3429280C1 (de) * 1984-08-08 1985-11-21 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Vorrichtung zum Bearbeiten keramischer Gegenstände mit nichtkreisförmigem Rand

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE596319C (de) * 1932-06-05 1934-05-02 Porzellanfabrik F Thomas Glasurabputzvorrichtung
DE1683976A1 (de) * 1968-01-24 1971-03-04 Service Eng Ltd Vorrichtung zum Glaetten keramischer Hohlformlinge
DE1910223A1 (de) * 1969-02-28 1970-09-17 Heinz Fladerer Maschine zum Bearbeiten von keramischen Koerpern
FR2433400A1 (fr) * 1978-08-17 1980-03-14 Demag Kunststofftech Procede et dispositif de moulage par injection de pieces en matiere ceramique
GB2053886A (en) * 1979-07-06 1981-02-11 British Ceramic Res Ass Treating ceramic articles
GB2080725A (en) * 1980-07-25 1982-02-10 Netzsch Maschinenfabrik A method of producing plates having a festooned rim and tools for performing the method.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1162048A2 (fr) * 2000-06-07 2001-12-12 SAMA Maschinenbau GmbH Dispositif de polissage pour articles en céramique de formes quelconques
EP1162048A3 (fr) * 2000-06-07 2003-05-07 SAMA Maschinenbau GmbH Dispositif de polissage pour articles en céramique de formes quelconques

Also Published As

Publication number Publication date
DE59005748D1 (de) 1994-06-23
EP0440965B1 (fr) 1994-05-18
DE4003816C1 (fr) 1991-02-14
EP0440965A3 (en) 1991-11-21

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