EP0440965B1 - Process and apparatus for making bowl-shaped ceramic products - Google Patents
Process and apparatus for making bowl-shaped ceramic products Download PDFInfo
- Publication number
- EP0440965B1 EP0440965B1 EP90125051A EP90125051A EP0440965B1 EP 0440965 B1 EP0440965 B1 EP 0440965B1 EP 90125051 A EP90125051 A EP 90125051A EP 90125051 A EP90125051 A EP 90125051A EP 0440965 B1 EP0440965 B1 EP 0440965B1
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- European Patent Office
- Prior art keywords
- rim
- articles
- axis
- face
- pressed
- 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
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- 238000000034 method Methods 0.000 title claims description 12
- 239000000919 ceramic Substances 0.000 title claims description 8
- 238000000227 grinding Methods 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 238000000462 isostatic pressing Methods 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims 3
- 239000012530 fluid Substances 0.000 claims 1
- 238000000465 moulding Methods 0.000 description 33
- 238000004140 cleaning Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000008187 granular material Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
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 regardless of the oval or polygonal shape of its rim, for example, before there is even the slightest risk that something could be removed from the rim itself.
- it is harmless if the molding axis is slightly offset parallel to the axis of rotation.
- the risk of damage is not significantly 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.
- 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 by 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 adjoined by an annular attachment 36 of the molded article 30, that 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 that 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 the thickness of the body.
- 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 which 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 molded article 30 at its 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 brackets 50 stands over the end of a feed conveyor 52, the second over a grinder 54, the third and seventh in an intermediate station 56, while the fourth, fifth and sixth brackets 50 each over 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, however, is 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 sponged molding 30 is placed on the discharge conveyor 60.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Herstellen schüsselförmiger keramischer Formlinge mit steiler Wand und in einer Ebene liegendem Bordrand, durch isostatisches Pressen der Formlinge aus keramischem Granulat, wobei sich ein über den Bordrand hinaus radial abstehender Grat bildet, und Abschleifen des Grats.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.
Beim Pressen keramischer Formlinge bildet sich stets ein Grat, der anschließend entfernt werden muß. Bei der üblichen Gestaltung der Vorrichtungen zum isostatischen Pressen keramischer Formlinge mit ebenem Bordrand (DD 153087) erstreckt sich der Grat in der Ebene des Bordrandes radial nach außen. Zum Beseitigen des Grats ist deshalb mindestens ein Putzwerkzeug erforderlich, das schräg gegen den Bordrand angestellt wird, während der Formling um seine eigene Achse gedreht wird. Üblicherweise wird als Putzwerkzeug eine rotierende Schleifscheibe verwendet, deren Drehachse in einem Abstand rechtwinklig zur Drehachse des Formlings angeordnet ist (DE 3150431 A1) oder die Drehachse des Formlings unter einem spitzen Winkel schneidet (DE 3429280 C1).A ridge always forms when pressing ceramic moldings, which must then be removed. 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. To remove the burr, therefore, 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).
Wenn auf solchen bekannten Vorrichtungen auch Formlinge geputzt werden sollen, die nicht rotationssymmetrisch sind und somit einen unrunden Bordrand haben, müssen während der Drehung des Formlings um seine eigene Achse radiale Relativbewegungen zwischen dem Formling und dem Putzwerkzeug stattfinden. Zum Steuern solcher Relativbewegungen werden Schablonen verwendet, die eine dem Bordrand entsprechende Form haben und gemeinsam mit dem Formling um dessen Achse gedreht werden (DE 3429280 C1). Damit der Grat rings um den Bordrand gleichmäßig abgetragen wird, ist es erforderlich, den Formling auf einer Platte od.dgl., mit der er sich drehen soll, genau zentrisch einzuspannen und für Formlinge unterschiedlicher Form oder Größe jeweils eine gesonderte Schablone zu verwenden. Unter Umständen müssen für unterschiedliche Formlinge auch unterschiedliche Putzwerkzeuge verwendet werden, damit die Außenkontur des Bordrandes nicht verfälscht wird. Beispielsweise muß bei Formlingen mit polygonalem Bordrand besonders darauf geachtet werden, daß von dessen Ecken nicht zuviel Material abgetragen wird. Dabei muß auch auf unterschiedliche Umfangsgeschwindigkeiten des um seine Achse rotierenden Formlings geachtet oder durch aufwendige Antriebssteuerungen für gleichmäßige Umfangsgeschwindigkeiten gesorgt werden.If moldings which are not rotationally symmetrical and thus have a non-circular rim are also to be cleaned on such known devices, radial relative movements between the mold and the cleaning tool must take place during the rotation of the mold about its own axis. To control such relative movements, templates are used which have a shape corresponding to the edge of the rim and which are rotated together with the molding about its axis (DE 3429280 C1). In order for the ridge to be removed evenly around the rim of the rim, it is necessary to clamp the molding precisely on a plate or the like with which it is to rotate and to use a separate template for moldings of different shape or size. Under certain circumstances, different cleaning tools must be used for different moldings so that the outer contour of the rim of the ship is not falsified. For example, in the case of moldings with a polygonal rim, particular care must be taken to ensure that not too much material is removed from the corners thereof. Attention must also be paid to different circumferential speeds of the molding rotating about its axis, or uniform circumferential speeds must be ensured by complex drive controls.
Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Gattung derart weiterzubilden, daß die Kontur der Formlinge beim Putzen keiner besonderen Beachtung bedarf.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.
Die Aufgabe ist erfindungsgemäß dadurch gelöst, daß die Formlinge mit einem ringförmigen Aufsatz gepreßt werden, der sich in Verlängerung der steilen Wand über den Bordrand hinaus erstreckt und eine vom Bordrand entfernte Stirnfläche aufweist, von der aus sich der Grat radial nach außen erstreckt, und die gepreßten Formlinge, während sie um ihre Achse gedreht werden, mit der Stirnfläche ihres Aufsatzes gegen eine geradlinig bewegte Schleiffläche gedrückt werden, bis der Aufsatz abgeschliffen ist.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.
Damit wird erreicht, daß jeder Formling unabhängig von der beispielsweise ovalen oder polygonalen Form seines Bordrandes zuverlässig vom Grat befreit wird, ehe auch nur die geringste Gefahr entsteht, daß vom Bordrand selbst etwas abgetragen werden könnte. Beim Drehen des Formlings ist es unschädlich, wenn die Formlingsachse gegen die Drehachse geringfügig parallelversetzt ist. Die Gefahr einer Beschädigung ist an besonders stark gekrümmten oder gar eckigen Abschnitten des Bordrandes nicht nennenswert größer als an geradlinigen Abschnitten; infolgedessen kann der erfindungsgemäße ringförmige Aufsatz zusammen mit dem Grat im allgemeinen in einer Zeit abgetragen werden, die kürzer ist als die Zeit, die bisher allein zum Abtragen des Grats erforderlich war.This ensures that each molding is reliably freed from the burr regardless of the oval or polygonal shape of its rim, for example, before there is even the slightest risk that something could be removed from the rim itself. When turning the molding, it is harmless if the molding axis is slightly offset parallel to the axis of rotation. The risk of damage is not significantly 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.
Vorteilhafte Weiterbildungen des erfindungsgemäßen Verfahrens ergeben sich aus den Ansprüchen 2 und 3. Eine Vorrichtung zum Pressen von Formlingen bei dem erfindungsgemäßen Verfahren ist Gegenstand der Ansprüche 4 und 5. Eine Vorrichtung zum Durchführen der Schleifbearbeitung bei dem erfindungsgemäßen Verfahren ist in den Ansprüchen 6 bis 10 beschrieben.Advantageous further developments of the method according to the invention result from claims 2 and 3. A device for pressing moldings in the method according to the invention is the subject of claims 4 and 5. A device for carrying out grinding in the method according to the invention is described in claims 6 to 10 .
Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand schematischer Zeichnungen mit weiteren Einzelheiten erläutert. Es zeigen:
- Fig. 1
- einen axialen Teilschnitt einer Vorrichtung zum Pressen von Formlingen bei dem erfindungsgemäßen Verfahren,
- Fig. 2
- einen vergrößerten Ausschnitt aus Fig. 1,
- Fig. 3
- die Draufsicht einer Vorrichtung zum Durchführen der Schleifbearbeitung bei dem erfindungsgemäßen Verfahren und
- Fig. 4
- den vergrößerten Schnitt IV-IV durch ein Schleifgerät.
- Fig. 1
- 3 shows an axial partial section of a device for pressing moldings in the method according to the invention,
- Fig. 2
- 2 shows an enlarged detail from FIG. 1,
- Fig. 3
- the top view of a device for performing the grinding processing in the inventive method and
- Fig. 4
- the enlarged section IV-IV through a grinder.
Die in Fig. 1 und 2 teilweise dargestellte Vorrichtung zum Pressen hat ein erstes Werkzeugteil 10, in das eine Matrize 12 sowie eine Membran 14 eingesetzt sind, und an dem rings um einen Randbereich der Membran 14 eine ebene Stirnfläche 16 ausgebildet ist. Die Matrize 12 enthält mindestens einen Kanal 18, durch den sich eine Flüssigkeit unter Druck zwischen Matrize 12 und Membran 14 einleiten läßt.1 and 2 has a
Zu der Vorrichtung zum Pressen gehört ferner ein zweites Werkzeugteil 20 mit einer Patrize 22, die eine Beschichtung 24 aus einem der Elastomere aufweist; diese Beschichtung bildet eine ebene ringförmige Stirnfläche 26, die in der abgebildeten Schließstellung der Werkzeugteile 10 und 20 an der Stirnfläche 16 des ersten Werkzeugteils 10 dicht anliegt. Zwischen der Membran 14 und der Beschichtung 24 ist ein Formhohlraum 28 ausgebildet, der sich bei dicht aneinanderliegenden Stirnflächen 16 und 26 durch mindestens einen nicht dargestellten Kanal in üblicher Weise mit keramischem Granulat füllen läßt.The device for pressing further includes a
Der Formhohlraum 28 bestimmt die Form eines in ihm zu pressenden Formlings 30, der in Fig. 4 genauer dargestellt ist. Der Formling 30 weist eine steile Wand 32 auf und hat insgesamt eine nicht rotationssymmetrische, beispielsweise ovale oder rechteckige, Form und einen entsprechend unrunden Bordrand 34 . An die steile Wand 32, die auch in Fig. 1 und 2 eingezeichnet ist, schließt sich in deren Verlängerung ein ringförmiger Aufsatz 36 des Formlings 30 an, der in einer vom Bordrand 34 entfernten, ebenen ringförmigen Stirnfläche 38 endet. Die Stirnfläche 38 begrenzt in axialer Richtung auch einen radial nach außen ragenden Grat 40, der sich beim Pressen bildet.The
Der ringförmige Aufsatz 36 ist ein die Gesamthöhe des gepreßten, aber noch nicht weiterbearbeiteten Formlings 30 erhöhendes Zwischenstück zwischen dem Bordrand 34 und dem Grat 40. Im dargestellten Beispiel hat der Aufsatz 36 eine Höhe von ungefähr gleicher Größe wie die Scherbendicke des Formlings 30 im Bereich des Bordrandes 34 und eine Dicke, die etwa halb so groß ist wie die Scherbendicke.The ring-shaped
Damit beim Pressen der ringförmige Aufsatz 36 entsteht, ist zwischen der Membran 14 und der Beschichtung 24 der Patrize 22 ein ringförmiger Zusatzraum 42 ausgebildet, der den Formhohlraum 28 von den aneinanderliegenden Stirnflächen 16 und 26 trennt und die Querschnittsform eines liegenden L aufweist. Die Beschichtung 24 weist in Höhe des Bordrandes 34 des Formlings 30 eine Stufe 44 auf, die dafür sorgt, daß der Bordrand 34 schon beim Pressen auf etwa seiner halben Breite seine endgültige Form annimmt.So that the
Die in Fig. 3 und 4 dargestellte Vorrichtung dient dazu, von Formlingen 30, die gemäß Fig. 1 und 2 gepreßt worden sind, den ringförmigen Aufsatz 36 abzutragen und anschließend den Bordrand 34 zu glätten. Die Vorrichtung hat eine senkrechte Säule 46, die um ihre Achse A schrittweise drehbar sowie längs dieser Achse heb- und senkbar ist. Von der Säule 46 ragen in gleichmäßigen Winkelabständen acht Arme 48 weg, die an ihren freien Enden je eine Halterung 50 für einen Formling 30 tragen. Die Halterungen 50 sind um je eine zur Achse A parallele Achse B drehantreibbar und sind an eine Unterdruckquelle angeschlossen, um jeweils einen Formling 30 ansaugen zu können.The device shown in FIGS. 3 and 4 is used to remove the
Nach jeder Drehbewegung der Säule 46 steht von den acht Halterungen 50 eine über dem Ende eines Zuführförderers 52, die zweite über einem Schleifgerät 54, die dritte und siebte in je einer Zwischenstation 56, während die vierte, fünfte und sechste Halterung 50 über je einem Schwammgerät 58 stehen und die achte Halterung 50 über einem Abführförderer 60 steht.After each rotation of the
Das Schleifgerät 54 hat gemäß Fig. 4 zwei waagerechte, parallele Umlenkrollen 62, zwischen denen eine in verschiedenen Höhen und Neigungen einstellbare ebene Unterlage 64 angeordnet ist. Über die Umlenkrollen 62 und die Unterlage 64 läuft ein endloses Schleifband 66, dessen Oberseite eine ebene, waagerechte Schleiffläche 68 bildet. Die Breite des Schleifbandes 66 ist kleiner als die größte diagonale Abmessung der im dargestellten Beispiel rechteckigen Formlinge 30.4, the
Die Schwammgeräte 58 sind ähnlich wie das Schleifgerät 54 gestaltet; sie haben je ein endloses Schwammband 70 mit einer Schwammfläche 72, deren Breite jedoch geringer ist als die Breite der Formlinge 30.The
Bei jedem Arbeitszyklus der in Fig. 3 und 4 dargestellten Vorrichtung übernimmt eine der Halterungen 50 einen Formling 30 vom Zuführförderer 52. Dieser Formling 30 wird beim nächsten Arbeitszyklus solange gegen die Schleiffläche 68 des umlaufenden Schleifbandes 66 gedrückt, bis der ringförmige Aufsatz 36 samt Grat 40 abgetragen und dadurch der Bordrand 34 freigelegt ist. Der auf diese Weise verputzte Formling 30 erreicht im Verlauf weiterer Arbeitszyklen nacheinander die drei Schwammgeräte 58, von denen der Bordrand 34 geglättet und nötigenfalls abgerundet wird. Schließlich wird der fertig verputzte und verschwammte Formling 30 auf dem Abführförderer 60 abgesetzt.In each working cycle of the device shown in FIGS. 3 and 4, one of the
Claims (10)
- A method of producing bowl-shaped ceramic articles (30) having a steep wall (32) and a rim (34) of even level, by- isostatic pressing of the articles (30) made of granular ceramic material, wherein a fin (40) radially projecting outwardly beyond the rim (34) is formed, and- grinding off the fin (40),
characterized in that- the articles (30) are pressed to have an annular addendum (36) which extends beyond the rim (34) in prolongation of the steep wall (32) and which has a face (38) being spaced apart from the rim (34), from which face the fin (40) projects radially outwardly, and- the pressed articles (30), while being rotated about their axis, are pressed with the face (38) of their addendum (36) against a linearly moving abrasive surface (58) until the addendum (36) has been ground off. - A method according to claim 1,
characterized in that the addendum (36) is pressed to have a height of similar size as the body thickness of the article (30) in the area of its rim (34) and to have a thickness at least equal to half of the body thickness. - A method according to claim 1 or 2,
characterized in that, after grinding off the addendum (36), two diametrally opposed areas of the rim (34) of the articles (30) are simultaneously pressed flatly against a linearly moving sponge surface (72) while the articles (30) are also being rotated along their axis. - Apparatus for pressing ceramic articles utilizing the method according to claim 1, comprising- a first tool part (10) having a female die (12), a membrane (14), a face (16) surrounding the membrane (14) as well as at least one conduit (18) for introducing a pressurized fluid between the female die (12) and the membrane (14),- a second tool part (20) having a male die (22) as well as a face (26) surrounding the male die, which face sits closely at the face (16) of the first tool part (10) when the tool parts (10, 20) are in locking position, and- a mould cavity (28) formed between the membrane (14) and the male die (22) while the tool parts (10, 20) are in locking position, the cavity being similar to the article (30) to be pressed and adapted to be filled with granular ceramic material,
characterized in that the mould cavity (28) is separated from the adjacent faces (16, 26) of the closed pressing tool (10, 20) by an additional annular space (42) which is also adapted to be filled with granular ceramic material. - Apparatus according to claim 4,
characterized in that the additional space (42) has a L-shaped cross-section. - Apparatus for performing a grinding operation utilizing the method according to claim 1 or 2,
characterized by- a number of arms (48) protruding radially from a common axis (A) and being commonly movable back and forth along said axis (A) and being intermittently rotatable around said axis (A) in synchronism with their axial movements,- holding means (50) for an article (30) each being rotatably journalled at a respective arm (48) each and movable around an axis (B) of their own and being connected to a rotary drive unit, and- a grinding device (54) having an endless abrasive belt (66) forming an abrasive surface (68) normal to the common rotary axis (A) of the arms (48), across which surface the holding means (50) are movable. - Apparatus according to claim 6,
characterized in that the width of the abrasive belt (66) is less than the widest diameter (D) of the fin (40) of the articles (30). - Apparatus according to claim 6 or 7,
characterized in that the abrasive belt (66) runs between two deflection rollers (62) on a plain support (64). - Apparatus according to anyone of the claims 6 to 8,
characterized in that at least one sponging device (58) having an endless sponge belt (70), commonly form a sponge surface (72) normal to the rotary axis (A) of the arms (48), across which surface the holding means (50) are also movable. - Apparatus according to claim 9,
characterized in that the sponge belt (70) is narrower than the internal diameter of the rim (34) of the articles (30).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4003816A DE4003816C1 (en) | 1990-02-08 | 1990-02-08 | |
| DE4003816 | 1990-02-08 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0440965A2 EP0440965A2 (en) | 1991-08-14 |
| EP0440965A3 EP0440965A3 (en) | 1991-11-21 |
| EP0440965B1 true EP0440965B1 (en) | 1994-05-18 |
Family
ID=6399715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90125051A Expired - Lifetime EP0440965B1 (en) | 1990-02-08 | 1990-12-20 | Process and apparatus for making bowl-shaped ceramic products |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0440965B1 (en) |
| DE (2) | DE4003816C1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10028297A1 (en) * | 2000-06-07 | 2001-12-13 | Sama Maschb Gmbh | Universal cleaning device for ceramic articles of any shape |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE596319C (en) * | 1932-06-05 | 1934-05-02 | Porzellanfabrik F Thomas | Glaze cleaning device |
| DE1683976A1 (en) * | 1968-01-24 | 1971-03-04 | Service Eng Ltd | Device for smoothing ceramic hollow moldings |
| DE1910223A1 (en) * | 1969-02-28 | 1970-09-17 | Heinz Fladerer | Machine for processing ceramic bodies |
| DE2836096A1 (en) * | 1978-08-17 | 1980-03-06 | Demag Kunststofftech | METHOD AND DEVICE FOR PRODUCING CERAMIC MOLDINGS IN THE WAY OF INJECTION MOLDING |
| GB2053886B (en) * | 1979-07-06 | 1982-11-24 | British Ceramic Res Ass | Treating ceramic articles |
| DE3028296A1 (en) * | 1980-07-25 | 1982-03-04 | Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb | METHOD FOR PRODUCING PLATES WITH A FIXED EDGE AND PRESSING AND CLEANING TOOLS FOR CARRYING OUT THE METHOD |
| DD153087A1 (en) * | 1980-09-25 | 1981-12-23 | Joachim Sauer | DEVICE FOR THE ISOSTATIC PRESSING OF CERAMIC OBJECTS |
| DE3150431A1 (en) * | 1981-12-19 | 1983-07-14 | Maschinen- und Stahlbau Julius Lippert GmbH & Co, 8487 Pressath | Cleaning machine for ceramic material |
| DE3429280C1 (en) * | 1984-08-08 | 1985-11-21 | Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb | Apparatus for machining ceramic articles with non-circular margin |
-
1990
- 1990-02-08 DE DE4003816A patent/DE4003816C1/de not_active Expired - Fee Related
- 1990-12-20 EP EP90125051A patent/EP0440965B1/en not_active Expired - Lifetime
- 1990-12-20 DE DE59005748T patent/DE59005748D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0440965A3 (en) | 1991-11-21 |
| DE4003816C1 (en) | 1991-02-14 |
| DE59005748D1 (en) | 1994-06-23 |
| EP0440965A2 (en) | 1991-08-14 |
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