METHOD AND ASSOCIATED MOULD AND TOOL FOR PRODUCING PORCELAIN OBJECTS WITH AT LEAST ONE THROUGH-HOLE

Description

[0001] The present invention relates to a method, a mould and an associated tool for producing porcelain objects with at least one through-hole.

[0002] In the technical sector relating to the production of porcelain objects other than plates and trays it is known to use plaster moulds in which the form of the object to be made is reproduced and inside which a mixture of liquid porcelain is cast.

[0003] It is also known that these moulds are provided with holes for introducing the casting mixture and holes for ventilation of the air which must escape from the mould so as to allow it to be filled with the porcelain and prevent trapping of air pockets which could result in breakage of the part during firing.

[0004] After a certain drying time, the object is removed from the mould and hand-finished by means of a series of steps involving firing, dipping in a surface finish glaze and firing at 1400°C after being placed on supports made of refractory material.

[0005] This conventional technique, although fulfilling its function, is however not suitable for producing objects which require through-holes, as, for example, with watch cases which must have a through-opening inside which the mechanism is inserted.

[0006] In addition to this, placing the object on support surfaces during firing of the glaze causes removal thereof with a consequent finishing defect in the finished article, which in these zones has a rough surface which is easily soiled and can no longer be decorated, this being particularly crucial with regard to watch cases which must always remain visible.

[0007] The closest prior art is represented by JP-A-07 191156, which discloses a method for producing porcelain objects with at least one through-hole, wherein it comprises the steps of preparation of a bottom half -mould having a half -seat with a form corresponding to that of the object to be obtained; preparation of a top half -mould having a half - seat with a form corresponding to that of the object to be obtained; joining together of the two half - moulds in the vertical direction; casting of the liquid porcelain; drying of the part with hole obtained; opening of the mould and extraction of the part.

[0008] Further prior art according to the preamble of claim 10 is disclosed into GB 313 325.

[0009] The technical problem which is posed, therefore, is to develop a method for producing porcelain objects which have at least one through-hole.

[0010] In connection with this problem a further requirement is that this through-hole may represent a precise reference point for the subsequent processing operations and/or assembly of the finished part, as, for example, with a watch case to which the associated mechanism must be fitted.

[0011] A further object of the present invention is to provide a tool and a mould which are able to allow the production of porcelain objects with at least one through-hole.

[0012] These results are achieved according to the present invention by a method for producing porcelain objects with at least one through-hole, according to the features of Claim 1. The present invention relates furthermore to a tool according to the characteristic features of Claim 10.

[0013] Further details may be obtained from the following description of a non-limiting example of embodiment of the subject of the present invention provided with reference to the accompanying drawings in which:

• Figure 1 is an exploded perspective view of a mould for porcelain objects according to the present invention;
• Figure 2 is a partially sectioned schematic view of the mould according to Fig. 1 in the open condition;
• Figure 3 is a schematic cross-section through the mould according to Fig. 1 in the closed condition, during casting;
• Figure 4 is a perspective view of a watch case obtained with the method according to the present invention; and
• Figure 5 is a partially sectioned schematic view of the watch according to Fig. 4 in the finished condition.

[0014] As shown in Fig. 1 and assuming solely from the sake of convenience of the description and without a restrictive meaning a set of three reference axes in the longitudinal direction X-X, transverse direction Y-Y and vertical direction Z-Z, respectively, and a top part and bottom part arranged as shown in the figures, a mould for porcelain objects according to the present invention comprises essentially a bottom half-mould 10 and a top half-mould 20 which have a marching shape and can be joined together in the vertical direction Z-Z by means of projections 10a and corresponding holes 20a formed in suitable zones of the two facing surfaces of the respective half-moulds.

[0015] Both the said contact surfaces of the two half-moulds have, formed in them, the associated half-seat 11, 21 corresponding to the final form of the part and intended to be filled with the casting mixture P of porcelain.

[0016] Both the half-moulds 10, 20 also have a respective hole 12, 22 which are coaxial with each other; the hole 12 in the bottom half-mould 10 is blind, while the hole 22 in the top half-mould 20 is a through-hole.

[0017] Via said holes 12, 22 it is possible to introduce a tool 30 for supplying the liquid mixture P of porcelain to the half-seats 11, 21; this tool 30 comprises a tubular member 31 which is open at the opposite ends and has upper holes 32a and lower holes 32b which are formed in the side surface of the tube at suitable distances from the respective opposite ends of the said tube. The top part of the tubular member 31 has, associated with it, a cup 33 for containing the mixture P of liquid porcelain which is able to enter into the tube 31 via the upper radial holes 32a.

[0018] In the example shown in figures, the cup 33 is integral with the tube 31, but in an alternative embodiment (not shown) it is envisaged that said cup 33 may be separate and provided with a through-hole in the bottom for coaxial mounting on the tube 31 during assembly of the mould on which it will rest during the working process. In this case the cup may also be made of plaster like the mould instead of steel as with the tubular member 31.

[0019] The distances of the lower radial holes 32b from the bottom end of the tubular member 31 and the depth of the blind hole 12 of the bottom half-mould 12 are such as to cause the liquid porcelain P to flow out into the seats 11, 21 so as to fill them.

[0020] Using the tool and the mould described above it is therefore possible to produce a porcelain object with a through-hole such as, for example, the watch case 100 in which a through-hole 110 is formed, by means of a method which envisages the following steps:

• preparation of a bottom half-mould 10 having a half-seat 11 with a form corresponding to that of the object to be obtained;
• provision of a blind hole 12 with a vertical axis in the half-seat 11 of this bottom half-mould 10;
• preparation of a top half-mould 20 having a half-seat 21 with a form corresponding to that of the object to be obtained;
• provision, in this top half-mould 20, of a through-hole 22 coaxial with the blind hole 12 of the bottom half-mould 10;
• provision of a tubular member 31 open at the opposite ends and provided with upper holes 32a and lower holes 32b formed on the side surface at suitable distances from the respective opposite ends of the tube;
• provision of a cup 33 for supplying the liquid porcelain P to be cast and with a hole in its bottom surface;
• joining together of the two half-moulds 10, 20 in the vertical direction Z-Z;
• insertion of the tubular member 31 inside the two half-moulds, i.e. top half-mould 20 and bottom half-mould 10, via the respective through-hole 22 and blind hole 12;
• mounting of the cup 33 on the tube part 31 projecting from the top half-mould 20;
• casting of the liquid porcelain P inside the cup 33;
• penetration of the liquid porcelain P inside the tube 31 via the upper radial holes 32a;
• flowing out of the porcelain P into the seat 11, 21 through the lower radial holes 32b;
• expulsion of the air A from the mould through the upper opening in the tube 31;
• drying of the part 100 with hole 110 obtained;
• opening of the mould;
• extraction of the part.

[0021] It can therefore be seen how the tool, the mould and the method according to the present invention allow the production of porcelain parts 100 with a through-hole 110 which, in the particular example of a watch case illustrated, is arranged coaxially in the centre thereof so as to form also a precise reference point for the subsequent operations involving:

• milling of the hole 110 so as to widen it to a size suitable for containing the (analog or digital) mechanism of the watch according to Fig. 5;
• application of the glaze and subsequent firing at 1400° C, for which step the case 100 may be gripped by means of said hole 110, making it possible to avoid resting the part on refractory supports with a consequent reduction in the defects in the finished parts.

[0022] In the particular instance of a watch case it is also envisaged that the method according to the present invention may also comprise the following steps:

• provision of first transverse seats 15, 25 inside the respective half-moulds 10, 20, arranged so that the opposite ends emerge outside and inside the central hole 12, 22;
• insertion, inside the seat 15, 25, of a pin 55 able to produce, during casting, the formation of a transverse hole 120 which passes through the case 100 in the direction Y-Y from the side surface 100a to the inside of the hole 110 so as to allow, after completion of the processing operations, insertion of the spindle 130a of the crown 130 for operating the hands 140.

[0023] Similarly it is also possible to envisage transverse seats 155 which pass through the respective half-moulds 10, 20 in the transverse direction Y-Y in a position corresponding to that of the strap holder cross-pieces 101 (Fig. 4) so as to form a through-seat 101a passing through them and able to allow the insertion of a movable clip 102 for fastening the two male and female parts of a strap 2 to the respective pins as shown in the bottom part of Fig. 5; the top part of the latter instead shows a complete strap 3 which passes underneath the case 100 and above the two opposite cross-pieces 101.

[0024] Although described in connection with porcelain, it is envisaged that the method, mould and tool according to the present invention may be used also for objects made of equivalent materials such as a ceramic material or the like.

Claims

1. Method for producing porcelain objects with at least one through-hole, wherein it comprises the following steps:

- preparation of a bottom half-mould (10) having a half-seat (11) with a form corresponding to that of the object to be obtained;

- provision of a blind hole (12) with a vertical axis in said half-seat (11) of the bottom half-mould (10);

- preparation of a top half-mould (20) having a half-seat (21) with a form corresponding to that of the object to be obtained;

- provision, in this top half-mould (20), of a through-hole (22) coaxial with the blind hole (12) of the bottom half-mould (10);

- provision of a tubular member (31) open at the opposite ends and provided with upper holes (32a) and lower holes (32b) formed on the side surface at suitable distances from the respective opposite ends of the tube;

- provision of a cup (33) for supplying the liquid porcelain (P) to be cast and with a hole in its bottom surface, having an inner diameter corresponding to the outer diameter of the tube (31);

- joining together of the two half-moulds (10, 20) in the vertical direction Z-Z;

- insertion of the tubular member (31) inside the two moulds, i.e. top half-mould (20) and bottom half-mould (10), via the respective through-hole (22) and blind hole (12);

- mounting of the cup (33) on the tube part (31) projecting from the top half-mould (20);

- casting of the liquid porcelain (P) inside the cup (33);

- penetration of the liquid porcelain (P) inside the tube (31) through the upper radial holes (32a);

- flowing out of the porcelain (P) into the seat (11, 21) through the lower radial holes (32b);

- expulsion of the air (A) from the mould through the upper opening in the tube (31);

- drying of the part (100) with hole (110) obtained;

- opening of the mould;

- extraction of the part.

2. Method according to Claim 1, characterized in that said bottom blind hole (12) and top through-hole (22) are coaxial with the centre of the part (100) to be formed.

3. Method according to Claim 2, characterized in that it envisages the further steps of:

- providing first transverse seats (15, 25) in the respective half-moulds (10, 20), arranged in positions such that the opposite ends emerge outside the half-moulds (10, 20) and inside the central hole (12, 22), respectively;

- inserting, in the seat (15, 25), a pin (55) able to produce, during casting, the formation of a transverse hole (120) which passes through the part (100) from the side surface (100a) to the inside of the vertical through-hole (110).

4. Method according to Claim 2, characterized in that said part is the case (100) of a watch.

5. Method according to Claim 4, characterized in that said vertical through-hole (110) is centred with respect to the said case (100).

6. Method according to Claim 4, characterized in that said vertical through-hole (110) is a pre-hole able to be widened to the size of the watch mechanism to be housed inside it.

7. Method according to Claim 4, characterized in that said transverse through-hole is the seat for the spindle (130a) operating the hands of the watch.

8. Method according to Claim 4, characterized in that it envisages the further steps of:

- providing second transverse seats which pass through the respective half-moulds (10, 20) in the transverse direction (Y-Y) in a location corresponding to that of the strap holder cross-pieces (101);

- inserting, in the seats (155), a pin (55) able to produce, during casting, the formation of a transverse hole (120) which passes through said cross-pieces (101) so as to form a through-seat (101a) in them.

9. Method according to Claim 1, characterized in that said cup (33) for containing the porcelain (P) is integral with the tubular member (31).

10. Tool for moulds for producing porcelain objects with at least one through-hole (110), comprising a tubular member (31) which is open at the opposite ends and provided with first upper holes (32a) and second lower holes (32b) formed in the side surface of the tube (31) at suitable distances from the respective opposite ends of the said tube.
characterized in that the tubular member (31) is associated with a cup (33) for containing the mixture (P) of liquid porcelain, arranged on its top part and
in that said upper radial holes (32a) of the tubular member are arranged at a suitable distance in the vertical direction (Z-Z) from the bottom of the cup (33) and are able to cause the entry of the porcelain (P) inside the tubular member.

11. Mould for producing porcelain objects (100) with at least one through-hole (110), characterized in that it comprises:

- a bottom half-mould (10) with a half-seat (11) having a form corresponding to that of the object to be obtained, said bottom half-mould (10) being provided with a blind hole (12) having a vertical axis in said bottom half-seat (11);

- a top half-mould (20) with a half-seat (21) having a form corresponding to that of the object to be obtained, said top half-mould having, formed therein, a through-hole (22) coaxial with the blind hole (12) of the bottom half-mould;

- a tool according to claim 10 and able to be coaxially inserted inside said top through-hole (22) and bottom blind hole (12) so as to supply the liquid porcelain (P) to the said half-seats (11, 21), and in that the said lower radial holes (32b) of the tubular member are arranged at a distance in the vertical direction (Z-Z) from the bottom of the blind hole (33) such as to emerge inside the seat (11, 21) for casting the object to be made.

12. Mould according to Claim 11, characterized in that said cup (33) is integral with the tubular member (31).

13. Mould according to Claim 11, characterized in that said seats (11, 21) are shaped in the manner of a case (100) of a watch.

14. Mould according to Claim 13, characterized in that said vertical through-hole (110) is centred with respect to the said case (100).

15. Mould according to Claim 11, characterized in that it comprises first transverse seats (15 25) which are formed in the respective half-moulds (10, 20) and arranged in positions such that the opposite ends emerge outside the respective half-moulds and inside the central hole (12, 22), respectively, said seats being able to contain a corresponding pin (55a) able to produce, during casting, the formation of a transverse hole (120) which passes through the object (100) from the side surface (100a) to the inside of the vertical through-hole (110).

16. Mould according to Claim 13, characterized in that it envisages second transverse seats (155) which pass through the respective half-moulds (10,20) in the transverse direction in a location corresponding to that of the strap holder cross-pieces (101), said seats being suitable for a corresponding pin (155a) able to produce, during casting, the formation of a transverse hole (120) which passes through said cross pieces (101) so as to form a through-seat (101a) in them.

Ansprüche

1. Verfahren zum Fertigen von Porzellanartikeln mit mindestens einem Durchgangsloch, umfassend die folgenden Schritte:

Erstellen einer unteren Halbform (10) mit einem Halbsitz (11) einer der Form des zu erhaltenden Artikels entsprechenden Form;

Bilden eines Sacklochs (12) mit einer vertikalen Achse innerhalb des Halbsitzes (11) der unteren Halbform (10);

Erstellen einer oberen Halbform (20) mit einem Halbsitz (21) einer der Form des zu erhaltenden Artikels entsprechenden Form;

Schaffen eines mit dem Sackloch (12) der unteren Halbform (10) koaxialen Durchgangslochs (22) in der oberen Halbform (20);

Bereitstellen eines rohrförmigen Elements (31), das an den einander abgewandten Enden offen und mit oberen Löchern (32a) und unteren Löchern (32b) an der Seitenfläche in passenden Abständen von der jeweiligen abgewandten Enden des Rohrs ausgestattet ist;

Bereitstellen eines Bechers (33) zum Zuführen des zu gießenden flüssigen Porzellans (P), ausgestattet mit einem Loch in einer Bodenfläche, dessen Innendurchmesser dem Außendurchmesser des Rohrs (31) entspricht;

Zusammenfügen der beiden Halbformen (10, 20) in vertikaler Richtung Z-Z;

Einführen des rohrförmigen Elements (31) in das Innere der beiden Formen, d. h. der oberen Halbform (20) und der unteren Halbform (10), durch das zugehörige Durchgangsloch (22) und das Sackloch (12);

Anbringen des Bechers (33) an dem Rohrteil (31), welches von der oberen Halbform (20) vorsteht;

Gießen des flüssigen Porzellans (P) in das Innere des Bechers (33);

Eindringen-Lassen des flüssigen Porzellans (P) in das Innere des Rohrs (31) durch die oberen radialen Löcher (32a);

Ausfließen-Lassen des Porzellans (P) in den Sitz (11, 21) durch die unteren radialen Löcher (32b);

Austreiben der Luft (A) aus der Form durch die obere Öffnung in dem Rohr (31);

Trocknen des erhaltenen Teils (100) mit Loch (110);

Öffnen der Form;

Entnehmen des Teils.

2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das untere Sackloch (12) und das obere Durchgangsloch (23) koaxial bezüglich des Mittelpunkts des zu fertigenden Teils (100) sind.

3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass es weitere folgende Schritte aufweist:

Bereitstellen erster Quersitze (15, 25) in den jeweiligen Halbformen (10, 20), angeordnet an derartigen Stellen, dass die abgewandten Enden aus der Halbform (10, 20) bzw. in das Innere des mittleren Lochs (12, 22) führen;

Einführen eines Stifts (55), der in der Lage ist, während des Gießvorgangs die Bildung eines Querlochs (120) hervorzurufen, welches von der Seitenfläche (100a) durch das Teil (100) zum Inneren des vertikalen Durchgangslochs (110) führt, in den Sitz (15, 25).

4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das Teil das Gehäuse (100) einer Uhr ist.

5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das vertikale Durchgangsloch (110) bezüglich des Gehäuses (100) zentriert ist.

6. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das vertikale Durchgangsloch (110) ein Vorloch ist, welches auf die Größe des darin unterzubringenden Uhrwerks aufweitbar ist.

7. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das Quer-Durchgangsloch der Sitz für die die Zeiger der Uhr betätigenden Spindel (130a) ist.

8. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass es die folgenden weiteren Schritte umfasst:

Bereitstellen zweiter Quersitze, die durch die jeweiligen Halbformen (10, 20) in Querrichtung (Y-Y) an einer Stelle verlaufen, die den Armbandhalterungen (101) entspricht;

Einführen eines Stifts (55), der während des Gießvorgangs in der Lage ist, die Ausbildung eines Querlochs (120) hervorzurufen, welches durch die Armbandhalterungen (101) verläuft, um in diesen einen Durchgangssitz (101a) zu bilden, in die Sitze (155).

9. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Becher (33) zum Aufnehmen des Porzellans (P) einstückig mit dem rohrförmigen Element (31) ausgebildet ist.

10. Werkzeug für Formen zum Fertigen von Porzellanartikeln mit mindestens einem Durchgangsloch (110), umfassend ein rohrförmiges Element (31), welches an den einander abgewandten Enden offen ist und mit ersten oberen Löchern (32a) und zweiten unteren Löchern (32b) in der Seitenfläche des Rohrs (31) in geeigneten Abständen bezüglich der jeweiligen abgewandten Enden des Rohrs ausgestattet ist, dadurch gekennzeichnet, dass das rohrförmige Element (31) einem Becher (33) zum Aufnehmen des Gemischs (P) von Flüssigporzellan zugeordnet ist, in dessen oberen Teil angeordnet ist, und dass die oberen radialen Löcher (32a) des rohrförmigen Elements in einem geeigneten Abstand in vertikaler Richtung (Z-Z) gegenüber in dem Boden des Bechers (33) angeordnet und in der Lage sind, den Eintritt des Porzellans (P) in das Innere des rohrförmigen Elements zu veranlassen.

11. Form zum Fertigen von Porzellanartikeln (100) mit mindestens einem Durchgangsloch (110), dadurch gekennzeichnet, dass sie aufweist:

- eine untere Halbform (10) mit einem Halbsitz (11) einer der Form des zu erhaltenden Artikels entsprechenden Form, wobei die untere Halbform (10) mit einem Sackloch (12) mit vertikaler Achse innerhalb des unteren Halbsitzes (11) ausgestattet ist;

- eine obere Halbform (20) mit einem Halbsitz (21) einer der Form des zu erhaltenden Artikels entsprechenden Form, wobei die obere Halbform in sich ein mit dem Sackloch (12) der unteren Halbform koaxiales Durchgangsloch (22) ausgebildet hat;

- ein Werkzeug gemäß Anspruch 10 und koaxial einsetzbar in das obere Durchgangsloch (22) und das Sackloch (12), um das Flüssigporzellan (P) den Halbsitzen (11, 21) zuzuführen, dass die unteren radialen Löcher (32b) des rohrförmigen Elements in vertikaler Richtung in einem Abstand (Z-Z) von dem Boden des Sacklochs (33) in der Weise angeordnet sind, dass sie in das Innere des Sitzes (11, 21) zum Gießen des zu erhaltenden Artikels münden.

12. Form nach Anspruch 11, dadurch gekennzeichnet, dass der Becher (33) einstückig mit dem rohrförmigen Element (31) ausgebildet ist.

13. Form nach Anspruch 11, dadurch gekennzeichnet, dass die Sitze (11, 21) in der Art eines Uhrgehäuses (100) geformt sind.

14. Form nach Anspruch 13, dadurch gekennzeichnet, dass das vertikale Durchgangsloch (110) bezüglich des Gehäuses (100) zentriert ist.

15. Form nach Anspruch 11, dadurch gekennzeichnet, dass sie erste Quersitze (15, 25) aufweist, die in den jeweiligen Halbformen (10, 20) ausgebildet und an solchen Stellen angeordnet sind, dass die einander abgewandten Enden zur Außenseite der jeweiligen Halbformen und in das Innere des Mittellochs (12, 22) münden, wobei die Sitze in der Lage sind, einen entsprechenden Stift (55a) aufzunehmen, der in der Lage ist, während des Gießvorgangs die Ausbildung eines Querlochs (120) zu veranlassen, welches von der Seitenfläche (100a) durch den Artikel (100) zum Inneren des vertikalen Durchgangslochs (110) verläuft.

16. Form nach Anspruch 13, dadurch gekennzeichnet, dass sie zweite Quersitze (155) aufweist, die durch die jeweiligen Halbformen (10, 20) in Querrichtung an einem Ort verlaufen, der demjenigen der Armbandhalterungen (101) entspricht, wobei die für einen entsprechenden Stift (155a) geeigneten Sitze in der Lage sind, während des Gießvorgangs die Ausbildung eines Querlochs (120) hervorzurufen, welches durch die Halterungen (101) verläuft, um in ihnen einen Durchgangssitz (101a) auszubilden.

Revendications

1. Procédé de fabrication d'objets en porcelaine présentant au moins un trou traversant, dans lequel il comprend les étapes suivantes :

- préparation d'un demi-moule inférieur (10), ayant un demi siège (11) avec une forme correspondant à celle de l'objet à obtenir ;

- fourniture d'un trou borgne (12) avec un axe vertical dans ledit demi-siège (11) du demi-moule de fond (10) ;

- préparation d'un demi-moule supérieur (20) ayant un demi siège (21) avec une forme correspondant à celle de l'objet à obtenir ;

- fourniture, dans ce demi-moule supérieur (20), d'un trou traversant (22) coaxial au trou borgne (12) du demi-moule inférieur (10) ;

- fourniture d'un organe tubulaire (31) ouvert aux extrémités opposées et muni de trous supérieurs (32a) et de trous inférieurs (32b) formés sur la surface latérale, à des distances appropriées des extrémités opposées respectives du tube ;

- fourniture d'une coupelle (33), pour fournir la porcelaine (P) liquide à mouler et avec, dans sa surface inférieure, un trou ayant un diamètre intérieur correspondant au diamètre extérieur du tube (31) ;

- jonction ensemble des deux demi-moules (10, 20) en direction verticale Z-Z ;

- insertion de l'organe tubulaire (31) à l'intérieur des deux moules, c'est-à-dire le demi-moule supérieur (20) et le demi-moule inférieur (10), via le trou traversant (22) respectif et le trou borgne (12) ;

- montage de la coupelle (33) sur la partie tubulaire (31) faisant saillie hors du demi-moule supérieur (20) ;

- coulée de la porcelaine (P) liquide à l'intérieur de la coupelle (33) ;

- pénétration de la porcelaine (P) liquide à l'intérieur du tube (31), à travers les trous supérieurs (32a) radiaux ;

- écoulement de la porcelaine (P) dans le siège (11, 21), à travers les trous inférieurs (32b) radiaux ;

- expulsion de l'air (A) hors du moule, à travers l'ouverture supérieure ménagée dans le tube (31) ;

- séchage de la partie (100) avec le trou (110) obtenu ;

- ouverture du moule ;

- extraction de la pièce.

2. Procédé selon la revendication 1, caractérisé en ce que lesdits trou borgne inférieur (12) et trou borgne supérieur (22) sont coaxiaux au centre de la pièce (100) à former.

3. Procédé selon la revendication 2, caractérisé en ce qu'il envisage les étapes supplémentaires consistant à :

- fournir, dans les demi-moules (10, 20) respectifs, des premiers sièges transversaux (15, 25), agencés en des positions telles que les extrémités opposées émergent à l'extérieur des demi-moules (10, 20) et à l'intérieur du trou central (12, 22), respectivement ;

- insérer, dans le siège (15, 25), une tige (55) en mesure de produire, durant la coulée, la formation d'un trou transversal (120) passant par la pièce (100), de la surface latérale (100a) à l'intérieur du trou traversant (110) vertical.

4. Procédé selon la revendication 2, caractérisé en ce que ladite pièce est le boîtier (100) d'une montre.

5. Procédé selon la revendication 4, caractérisé en ce que ledit trou traversant (110) vertical est centré par rapport audit boîtier (100).

6. Procédé selon la revendication 4, caractérisé en ce que ledit trou traversant (110) vertical est un pré-trou, en mesure d'être élargi à la taille du mécanisme de montre à loger à l'intérieur de lui.

7. Procédé selon la revendication 4, caractérisé en ce que ledit trou traversant vertical est le siège pour la broche (130a) actionnant les aiguilles de la montre.

8. Procédé selon la revendication 4, caractérisé en ce qu'il envisage les étapes supplémentaires consistant à :

- fournir des deuxièmes sièges transversaux, passant par les demi-moules (10, 20) respectifs dans la direction transversale (Y-Y), en un emplacement correspondant à celui des parties transversales formant support de bracelet (101) ;

- insérer, dans les sièges (155), une tige (55) en mesure de produire, durant la coulée, la formation d'un trou transversal (120) passant par lesdites parties transversales (101), de manière à former un siège traversant (101a) en elles.

9. Procédé selon la revendication 1, caractérisé en ce que ladite coupelle (33) pour contenir la porcelaine (P) est réalisée d'une seule pièce avec l'organe tubulaire (31).

10. Outil pour des moules pour la fabrication d'objets en porcelaine présentant au moins un trou traversant (110), comprenant un organe tubulaire (31) ouvert aux extrémités opposées et muni de premiers trous supérieurs (32a) et de deuxièmes trous inférieurs (32b) formés dans la surface latérale du tube (31), à des distances appropriées des extrémités opposées respectives dudit tube ;
caractérisé en ce que
l'organe tubulaire (31) est associé à une coupelle (33), pour fournir le mélange (P) de porcelaine liquide, agencée sur sa partir supérieure, et
lesdits trous supérieurs (32a) radiaux de l'organe tubulaire sont agencés à une distance appropriée en direction verticale (Z-Z) vis-à-vis du fond de la coupelle (31) et sont en mesure de provoquer l'entrée de la porcelaine (P) à l'intérieur de l'organe tubulaire.

11. Moule pour la fabrication d'objets (100) en porcelaine, avec au moins un trou traversant (110), caractérisé en ce qu'il comprend :

- un demi-moule inférieur (10), ayant un demi siège (11) ayant une forme correspondant à celle de l'objet à obtenir, ledit demi-moule inférieur (10) étant muni d'un trou borgne (12) ayant un axe vertical, dans ledit demi-siège inférieur (11) ;

- un demi-moule supérieur (20), ayant un demi siège (21) avec une forme correspondant à celle de l'objet à obtenir, ledit demi-moule supérieur ayant, formé en son sein, un trou traversant (22) coaxial au trou borgne (12) du demi-moule inférieur ;

- un outil selon la revendication 10 et en mesure d'être inséré coaxialement à l'intérieur desdits trou traversant supérieur (22) et trou borgne inférieur (12), de manière à fournir la porcelaine (P) liquide auxdits demi-sièges (11, 21), et

en ce que lesdits trous inférieurs (32b) radiaux de l'organe tubulaire sont agencés à une distance, dans la direction verticale (Z-Z), vis-à-vis du fond du trou borgne (33), permettant d'émerger à l'intérieur du siège (11, 21) pour mouler l'objet à fabriquer.

12. Moule selon la revendication 11, caractérisé en ce que ladite coupelle (33) est réalisée d'une seule pièce avec l'organe tubulaire (31).

13. Moule selon la revendication 11, caractérisé en ce que lesdits sièges (11, 21) sont conformés à la manière d'un boîtier (100) d'une montre.

14. Moule selon la revendication 13, caractérisé en ce que ledit trou traversant (110) vertical est centré par rapport audit boîtier (100).

15. Moule selon la revendication 11, caractérisé en ce qu'il comprend des premiers sièges transversaux (15, 25), formés dans les demi-moules (10, 20) respectifs et agencés en des positions telles que les extrémités opposées émergent à l'extérieur des demi-moules respectifs et à l'intérieur du trou central (12, 22), respectivement, lesdits sièges étant en mesure de contenir une tige (55a) correspondante, en mesure de produire, lors de la coulée, la formation d'un trou transversal (120) passant par l'objet (100), de la surface latérale (100a) à l'intérieur du trou traversant (110) vertical.

16. Moule selon la revendication 13, caractérisé en ce qu'il envisage des deuxièmes sièges transversaux (155), passant par les demi-moules (10, 20) respectifs, dans la direction transversale, en un emplacement correspondant à celui des parties transversales formant support de bracelet (101), lesdits sièges convenant pour une tige (155a) correspondante, en mesure de produire, durant la coulée, la formation d'un trou transversal (120) passant par lesdites parties transversales (101), de manière à former un siège traversant (101a) en elles.

Drawing