DEVICE FOR PRODUCING CERAMIC PARTS

Abstract

A slip casting mold is useful for producing a ceramic die cast part. The slip casting mold includes a first mold part with a first main part and a first filtration layer and comprising at least one second mold part with a second main part and a second filtration layer. The first main part is equipped with at least one first dewatering channel with at least one dewatering channel end that opens into a second dewatering channel within the second mold part or into a dewatering channel within an additional dewatering body in a casting position.

Claims

1. A slip casting mold, for producing a ceramic die-cast part, comprising: at least one first mold part having a first base body and a first filtration layer, and at least one second mold part having a second base body and a second filtration layer, wherein at least one first dewatering channel is provided in the first base body having at least one dewatering channel end, which, in a casting position, opens into a second dewatering channel within the second mold part or into a dewatering channel within an additional dewatering body.

2. The slip casting mold according to claim 1, wherein a dewatering channel end filter layer, and/or a dewatering channel end valve device is provided at the dewatering channel end.

3. The slip casting mold according to claim 1, wherein the first dewatering channel has at least one fluid supply and/or discharge end, via which air or water can be supplied and/or discharged.

4. The slip casting mold according to claim 1, wherein the first dewatering channel adjoins the first filtration layer without penetrating it, or the first dewatering channel at least partially penetrates the first filtration layer.

5. A slip casting device, comprising at least one slip casting mold according to claim 1 for producing a a ceramic die-cast part.

6. The slip casting device according to claim 5, wherein a a robot is provided in order to remove the first mold part together with the cast part from the second mold part.

7. The slip casting device according to claim 5, wherein at least one fluid supply and/or discharge device is provided in order to press air or water in the direction of a mold cavity or to suck it off from there.

8. A method for dewatering a ceramic die-cast part, in a casting mold according to claim 1, wherein the casting mold comprises at least a first mold part having a first base body and a first filtration layer and at least a second mold part having a second base body and a second filtration layer, the method comprising discharging liquid through the first base body and from there through the second base body and/or through an additional dewatering body.

9. The method according to claim 8, wherein first and second mold parts are pressed against each other during dewatering.

10. The method according to claim 8, wherein during dewatering, a negative or positive pressure is built up in at least one first dewatering channel of the first mold part and/or during dewatering, a negative or positive pressure is built up in at least one second dewatering channel of the second mold part.

11. A method for producing a ceramic die-cast part, using a casting mold, said casting mold comprising: at least one first mold part having a first base body and a first filtration layer, and at least one second mold part having a second base body and a second filtration layer, wherein at least one first dewatering channel is provided in the first base body having at least one dewatering channel end, which, in a casting position, opens into a second dewatering channel within the second mold part or into a dewatering channel within an additional dewatering body, the method comprising: filling a mass to be cast into a cavity; dewatering according to claim 8, and removing the cast part from the mold.

12. The method according to claim 11, wherein the cast part is removed laterally by a robot.

13. (canceled)

14. The slip casting mold according to claim 3, wherein the fluid supply and/or discharge end is assigned a valve, so that a flow path can be opened or closed in the direction of the first filtration layer and/or in the direction of the dewatering channel end.

Description

[0035] In the following, the invention is described using a comparison example and an embodiment example, which are explained in more detail using the illustrations, wherein:

[0036] FIG. 1 shows a schematic representation of a comparison example of a slip casting mold; and

[0037] FIG. 2 shows a schematic representation of a slip casting mold according to a first embodiment of the invention; and

[0038] FIG. 3 shows a schematic representation of a slip casting mold according to a second embodiment of the invention.

[0039] In the following description, the same reference numerals are used for identical and equivalent parts.

[0040] FIG. 1 shows a comparison example for a slip casting mold in a schematic section. The slip casting mold comprises a first mold part 10 and a second mold part 11. Between the mold parts 10, 11 there is slurry 26 for the production of a die-cast part. In the first mold part 10 two first dewatering channels 12a, 12b are provided. In the second mold part 11, two second dewatering channels 13a, 13b are provided.

[0041] The first dewatering channels 12a, 12b are arranged in a first base body 14 of the first mold part 10. Furthermore, the first mold part 10 has a first filtration layer 15. Similarly, the second mold part 11 comprises a second base body 16 and a second filtration layer 17. To produce a (ceramic) cast part, the slurry 26 is introduced into a cavity 18 between the first mold part and the second mold part 11. The slurry is pressurized so that water is pressed out of the slurry and can be discharged via the filtration layers 15, 17 or the dewatering channels 12a, 12b, 13a, 13b. This results in a so-called body (green compact). For the demolding of the body, the mold parts 10, 11 must be opened (i.e. removed from each other) so that the body can be removed. The mold parts 10, 11 can then be cleaned (usually with water and/or air). The mold parts 10, 11 can be closed again so that a new casting cycle can start.

[0042] According to FIG. 1, the filtration water (i.e. the water pressed out of the slurry) is thus discharged (individually) by the two mold parts 10 and 11. For this purpose, 10 first connections 19a, 19b are provided on the first mold part and 11 second connections 20a and 20b on the second mold part. Hoses (or similar lines) are then usually connected to these connections, through which the water can be discharged. Such (flexible) lines can compensate a relative stroke between the first and second mold part (e.g. during product removal or cleaning, etc.).

[0043] FIG. 2 shows in a schematic section a first design of a slip casting mold according to the invention.

[0044] In this case, the first mold part 10 has first dewatering channels 12a, 12b, each having a dewatering channel end 21a, 21b, each of which (in the first mold part 10 and the second mold part 11, as are shown pressed against each other in FIG. 1) are connected in the casting position (directly) to second dewatering channels 22a, 22b, so that pressed-out water (filtration water) can be discharged from the first filtration layer 15 via the first dewatering channels 21a, 21b and the second dewatering channels 13a, 13b. Thus it is not necessary to connect a hose or the like to the dewatering channel ends 21a, 21b (which is not even possible in the casting position), but the water is discharged via the second mold part. The first mold part 10 can thus be lifted together with the body (green compact) comparatively easily and flexibly (especially via a robot) and flexibly positioned elsewhere. In summary, the water thus flows from the slurry in cavity 18 via the first filtration layer 15 into the first dewatering channels 12a, 12b and can be discharged from this via the second dewatering channels 13a, 13b.

[0045] As soon as the green compact is completely cast (in particular in a die casting process for producing a ceramic product) the first mold part 10 can be lifted with the aid of a removal device (of a robot; in particular together with the green compact).

[0046] It is preferable for this purpose to apply a vacuum (negative pressure) to the first mold part 10 so that the green compact adheres to the first mold 10 and can be moved with it. For this purpose, a robot or other removal device can open (press open) a valve 22a or 22b so that a fluid connection is realized between the first filtration layer 15 and a fluid supply and/or discharge end 23a or 23b and from there a negative pressure can be applied. In addition, a positive pressure can then be applied to position the green compact in another way (or place it on a shelf), so that the green compact detaches itself from the first mold part 10. Furthermore, water and/or air can also be introduced or extracted via the fluid supply and/or discharge ends 23a or 23b (e.g. for cleaning). A dewatering channel end filtration layer 24a or 24b in the first dewatering channel 12a or 12b ensures that fluid, which, for example, is present via the fluid supply and/or discharge end 23a or 23b and is to be conveyed in the direction of the filtration layer 15, does not (exclusively) drain via the first dewatering channel end 21a or 21b.

[0047] Furthermore, an (at least slight) positive pressure or negative pressure can be built up (in the first dewatering channels 12a, 12b and/or second dewatering channels 13a, 13b) (in particular for a better discharge of the filtration water in the casting process, in which the mold parts 10, 11 are closed). For example, it would be conceivable that a positive pressure would be built up in the second dewatering channel 13a and a negative pressure in the second dewatering channel 13b so that the total filtration water would be conveyed in the direction of the second dewatering channel 13b.

[0048] A second dewatering channel 13c (centered in FIG. 2) is in contact with the second filtration layer 17. This dewatering channel can define a slurry connection. Furthermore, the dewatering channel 13c can also be arranged at a different location. The second dewatering channels 13a and 13b are not connected to the second filtration layer 17 (and also not to the first filtration layer 15).

[0049] Seals 25a, 25b are arranged around the dewatering channel ends 21a, 21b to allow effective transfer of water from the first dewatering channels 12a, 12b to the second dewatering channels 13a, 13b.

[0050] In principle, two or more second dewatering channels can also be provided, which are in contact with the second filtration layer. An example is shown in FIG. 3, which shows a second embodiment example corresponding to the first embodiment example with the difference that two second dewatering channels 13c, 13d are provided, which are in contact with the second filtration layer 17.

[0051] At this point, it should be noted that all the parts described above are considered to be essential to the invention, as seen on their own and in any combination, in particular the details depicted in the drawings. The person skilled in the art is familiar with modifications made thereto.

LIST OF REFERENCE NUMERALS

[0052] 10 First mold part [0053] 11 Second mold part [0054] 12a, 12b First dewatering channel [0055] 13a, 13b, 13c, 13d Second dewatering channel [0056] 14 First base body [0057] 15 First filtration layer [0058] 16 Second base body [0059] 17 Second filtration layer [0060] 18 Cavity [0061] 19a, 19b Connection [0062] 20a, 20b Connection [0063] 21a, 21b Dewatering channel end [0064] 22a, 22b Valve [0065] 23a, 23b Fluid supply and/or discharge end [0066] 24a, 24b Dewatering channel end filtration layer [0067] 25a, 25b Seal [0068] 26 Slurry