Abstract
A method for producing a cold casting mold (100) for producing dental molded parts (210) from a mixing compound (200), wherein the cold casting mold (100), having a cavity (110) that corresponds geometrically to the dental molded part (210), is additively constructed from a starting material (150) by means of a 3D printing method on the basis of a digital data set based on a three-dimensional model of the oral cavity of a patient and at least one first opening (111) that opens into the cavity (110) for filling with the mixing compound (200). The invention also relates to such an additively constructed cold casting mold (100) for a method for producing dental molded parts (210) from a sinterable or a light-curing mixing compound (200). The cold casting mold (100) is constructed having at least one second opening that opens into the cavity (110) for discharging gases and/or liquids.
Claims
1. A method for producing a cold casting mold (100) for producing molded parts (210), from a mixing compound (200), wherein the cold casting mold (100), having a cavity (110) that corresponds geometrically to the molded part (210), is additively constructed from a starting material (150) by means of an additive material construction method, on the basis of a digital data set based on a three-dimensional model and with at least one first opening (111) that opens into the cavity (110) for filling with the mixing compound (200), characterized in that the cold casting mold (100) is additively constructed having at least one second opening (112) opening into the cavity (110) or leading out of the cavity (110) for discharging gases.
2. The method as claimed in claim 1, characterized in that at least one wall (120) of the cold casting mold (100) delimiting the cavity (110) is additively constructed completely or in regions having a plurality of second openings (112) opening into the cavity (110) and penetrating this wall (120) for discharging gases.
3. The method as claimed in claim 2, characterized in that the plurality of second openings (112) are formed in the manner of pores or capillaries penetrating the wall (120), so that the wall (120) has porous or hygroscopic properties completely or in regions.
4. The method as claimed in claim 1, characterized in that the cold casting mold (100) is additively constructed having a filling channel (130) adjoining the at least one first opening (111) in a fluid-conducting manner.
5. The method as claimed in claim 4, characterized in that the filling channel (130) is connected in a fluid-conducting manner to at least one compensating volume (131) for storing mixing compound (200).
6. (canceled)
7. The method as claimed in claim 1, characterized in that an organic material is used as the starting material (150) for additively constructing the cold casting mold (100), so that the cold casting mold (100) can be plasticized and/or thermally and/or thermochemically decomposed.
8. (canceled)
9. (canceled)
10. (canceled)
11. The method as claimed in claim 1, characterized in that at least one wall (120) delimiting the cavity (110) of the cold casting mold (100) is additively constructed having a predetermined breaking point (124).
12. The method as claimed in claim 1, characterized in that the digital data set based on a three-dimensional model for the geometric design of the cavity (110) of the cold casting mold (100) comprises a sintering and/or hardening-related volume shrinkage of the mixing compound (200).
13. A cold casting mold (100) for producing molded parts (210) from a mixing compound (200), which cold casting mold (100) is integrally produced by means of an additive material construction method, wherein the cold casting mold (100) has a cavity (110) that corresponds geometrically to the molded parts (210) and is created on the basis of a digital data set based on a three-dimensional model, and at least one first opening (111) opening into the cavity (110) for filling with the mixing compound (200), characterized in that the cold casting mold (100) has at least one second opening (112) opening into the cavity (110) for discharging gases.
14. (canceled)
15. (canceled)
16. (canceled)
17. (canceled)
18. (canceled)
19. (canceled)
20. A method for producing molded parts (210) from a sinterable mixing compound (200) using a cold casting mold (100) as claimed in claim 13, having the following method steps: (1) providing or producing the cold casting mold (100) having a cavity (110) and at least one first opening (111) opening into the cavity (110) and at least one second opening (112) opening into the cavity (110), (2) filling the cavity (110) of the cold casting mold (100) via the at least one first opening (111) with the sinterable mixing compound (200), and (3) curing or solidifying the sinterable mixing compound (200) in the cavity (110) of the cold casting mold (100), wherein gases or liquids contained or enclosed in the sinterable mixing compound (200) are discharged from the cavity (110) via the at least one second opening (112), (4) initiating a thermal or thermochemical decomposition of the cold casting mold (100) at a temperature in a temperature range from 200° C. to 650° C., (5) sintering the sinterable mixing compound (200) to final hardness until a molded part (210) is obtained.
21. The method as claimed in claim 20, characterized in that the mixing compound (200) is provided as a slurry or pasty mass and comprises a diluent (205), wherein the mixing compound (200) cures in the cavity (110) of the cold casting mold (100) by drying and a liquid component or moisture content of the mixing compound (200) is discharged from the cold casting mold (100) by means of the at least one or the plurality of second openings (112).
22. The method as claimed in claim 21, characterized in that the mixing compound (200) comprises a metal powder (209) or a ceramic powder (209) or a glass ceramic powder and a binder (206).
23. The method as claimed in claim 22, characterized in that the mixing compound (200) cures in the cavity (110) of the cold casting mold (100) to green body hardness.
24. (canceled)
25. The method as claimed in claim 23, characterized in that the mixing compound (200) is presintered (5.1) for debinding.
26. The method as claimed in claim 25, characterized in that the melting point or the decomposition temperature of the cold casting mold (100) is below the sintering temperature of the metal powder (209) or ceramic powder (209).
27. (canceled)
28. (canceled)
29. (canceled)
30. A method for producing molded parts (210) from a light-curing mixing compound (200) using a cold casting mold (100) as claimed in claim 13, wherein the method comprises: (1) providing or producing the cold casting mold (100) having a cavity (110) and at least one first opening (111) opening into the cavity (110) and at least one second opening (112) opening into the cavity (111), (2) filling the cavity (110) of the cold casting mold (100) via the at least one first opening (111) with the light-curing mixing compound (200), and (3) curing or solidifying the mixing compound (200) in the cavity (110) of the cold casting mold (100), wherein gases or liquids contained or enclosed in the light-curing mixing compound (200) are discharged from the cavity (110) via the at least one second opening (112), and (4) mechanically separating the cold casting mold (100) from the hardened mixing compound (200) along one or more predetermined breaking points (124) in order to obtain a molded part (210).
31. (canceled)
32. (canceled)
33. The method as claimed in claim 30, characterized in that the mixing compound (200) cures in the cavity (110) of the cold casting mold (100) due to the action of light, wherein the walls (120) delimiting the cavity (110) of the cold casting mold (100) are transparent or transmissive to UV radiation and the cold casting mold (110) is irradiated using light from a light source (231).
34. The method as claimed in claim 33, characterized in that the mixing compound (200) cures in the cavity (110) of the cold casting mold (100) to final hardness.
35. (canceled)
36. (canceled)
37. The method as claimed in claim 34, characterized in that the mixing compound (200) cures in the cavity (110) of the cold casting mold (100) under the action of heat, wherein the cold casting mold (100) filled with the mixing compound (200) is placed in a drying cabinet or a sintering oven and a temperature in a temperature range of 30° C. to 120° C., or an ambient humidity in a range from 1% to 50% are set.
38. (canceled)
39. (canceled)
40. (canceled)
41. (canceled)
42. The method as claimed in claim 1, characterized in that the cold casting mold (100) is additively constructed with a cavity (110) on the basis of a digital data set based on a three-dimensional model of the oral cavity of a patient, wherein the cavity (110) corresponds geometrically to a dental molded part (210) for producing dental molded parts (210) from the mixing compound (200).
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0078] Further details, features, feature (sub-)combinations, advantages, and effects on the basis of the invention will be apparent from the following description of a preferred exemplary embodiment and from the drawings. In the figures
[0079] FIG. 1 shows a schematic perspective representation of a first exemplary embodiment of a cold casting mold according to the invention having a filling channel and a compensating volume,
[0080] FIG. 2 shows a sectional view of the cold casting mold from FIG. 1,
[0081] FIG. 3 shows a schematic perspective representation of a second exemplary embodiment of a cold casting mold according to the invention having a filling channel,
[0082] FIG. 4 shows a schematic perspective representation of a third exemplary embodiment of a cold casting mold according to the invention having a total of five filling channels,
[0083] FIG. 5 shows a schematic perspective representation of a fifth exemplary embodiment of a cold casting mold according to the invention having five filling channels and a mixing means,
[0084] FIG. 6 shows a sectional view of the cold casting mold from FIG. 5 having connected filling means,
[0085] FIG. 7 shows a schematic side view of a fourth exemplary embodiment of a cold casting mold according to the invention having wall reinforcements and predetermined breaking points,
[0086] FIG. 8 shows a schematic perspective representation of a molded part which was produced using a cold casting mold according to the invention,
[0087] FIG. 9 shows a sectional view of the cold casting mold from FIG. 4, which is filled with different mixing compounds,
[0088] FIG. 10 shows a schematic representation of the cavity of the cold casting mold from FIG. 9 filled with different mixing compounds,
[0089] FIG. 11 shows a sectional view of the cold casting mold from FIG. 9, which is filled with different mixing compounds,
[0090] FIG. 12 shows a flow chart of an exemplary sequence of the method according to the invention for producing a molded part, in particular a dental molded part,
[0091] FIG. 13 shows a schematic sectional view of the cold casting mold from FIGS. 1 and 2, which is electrophoretically filled with mixing compound,
[0092] FIG. 14 shows a schematic sectional view of the cold casting mold from FIGS. 1 and 2, which is filled with mixing compound under the action of pressure, and
[0093] FIG. 15 shows a schematic representation of a cold casting mold whose cavity corresponds to the shape of a dental prosthesis.
[0094] The figures are merely of an exemplary nature and are used only to understand the invention. The same elements are provided with the same reference numerals and are therefore usually only described once.
DETAILED DESCRIPTION OF THE INVENTION
[0095] FIGS. 1 and 2 each show a first embodiment of a cold casting mold 100 according to the invention, in a schematic perspective view and in a sectional view, respectively. The cold casting mold 100 is embodied here, for example, in the form of a test specimen, the cavity 110 of which has geometric properties typical for dental molded parts 210, which result in wall thicknesses of the molded part 210 in a range from 0.30 mm to 10 mm. The cavity 110 of the cold casting mold 100 is delimited by the external walls 121 and the inner walls 122 of the cold casting mold 100, so that the finished molded part 210, for example a crown, has an internal cavity 211 (see FIG. 8) which, for example, corresponds to the shape of an abutment, as a result of which the crown can be placed on the abutment. For this purpose, the inner walls 122 form a cylindrical or truncated cone shape. A first opening 111 opens into the cavity 110 and penetrates one of the external walls 121 which are occlusal with respect to the dental molded part 210. The cavity 110 is filled with the mixing compound 200 via the first opening 111. The inner walls 122 are penetrated using a plurality of second openings 112 which, for example, allow fluids 205, 207 and/or air inclusions 208 contained in the mixing compound 200 to escape already during the filling process. After the filling, fluids 205, 207, 208 can optionally also escape via the first opening 111. The plurality of second openings 112 can, as shown here by way of example, penetrate an inner lateral surface of the cavity 110 like a sieve. Alternatively, the plurality of second openings 112 could be embodied in the form of pores and/or capillaries and form a porous and/or hygroscopic surface.
[0096] A filling channel 130 having a compensating volume 131 adjoins the first opening 111 in a fluid-conducting manner. Filling means 400, for example injection syringes 420, in particular low-pressure injection syringes (see FIG. 15) or supply lines, such as hoses 410 (see FIG. 6) can be connected to the filling channel 130 to facilitate the filling of the cavity 110 with mixing compound 200. The compensation volume 131 is used as a type of reservoir for the mixing compound 200 so that the volume loss of fluids 205, 207, 208 escaping through the second openings 112 can be compensated for by means of the mixing compound 200 stored in the compensating volume 131. In the exemplary embodiment shown, the cold casting mold 100 is produced integrally with the filling channel 130 and the compensating volume 131.
[0097] FIG. 3 shows a schematic perspective representation of a second exemplary embodiment of a cold casting mold 100 according to the invention. The cold casting mold 100 corresponds to the first exemplary embodiment shown in FIGS. 1 and 2, with the exception that the filling channel 130 is formed without the (optional) compensating volume 131 and a channel-like, second opening 112 opens integrally into the occlusal, external wall 121. The filling channel 130 can optionally be implemented integrally or also as an additional part of the cold casting mold (100) and opens with its first opening 111 into the cavity (110). In this variant, the first opening 111 penetrates the second opening 112 concentrically. If required, a separate compensating volume 131 can be connected to the filling channel 130, in particular as part of a filling means 400.
[0098] A sectional representation of a third exemplary embodiment of a cold casting mold 100 according to the invention having a total of five filling channels 130 can be seen in FIG. 4. The filling channels 130 each open into the cavity 100 via the first openings 111 penetrating the occlusal, external wall 121 of the cold casting mold 100. Each of the filling channels 130 is connected in a fluid-conducting manner to an associated compensating volume 131. The cold casting mold 100 can optionally be filled with the same or different mixing compound 200 via one or more of the filling channels 130, wherein filling channels 130 not used for filling then function as respective second openings 112 and are used for discharging fluids 205, 207 and/or air inclusions 208 contained in the mixing compound 200. In particular if all filling channels 130 are used, the cavity 110 of the cold casting mold 100 can be filled quickly and particularly evenly.
[0099] FIG. 5 shows a schematic perspective representation of a fourth exemplary embodiment of a cold casting mold 100 according to the invention. The cold casting mold 100 has a total of five filling channels 130 which, penetrating the occlusal, external wall 121, open into the cavity 110 via first openings 111. One of the filling channels 130 is provided with a conveying and/or mixing means 132, here in the form of a screw conveyor. This filling channel 130 is formed having a larger cross-sectional area, in particular a larger diameter, than the four other filling channels 130. According to the illustrated figure, the conveying and/or mixing means 132 is pushed as an additional component into the filling channel 130, which is preferably embodied integrally with the cold casting mold 100. The conveying and/or mixing means 132 can particularly advantageously be additively formed directly in the interior of the filling channel 130 during the production of the cold casting mold 100.
[0100] FIG. 6 shows the cold casting mold according to FIG. 5 in a sectional view having additional, respective compensating volumes 131 which connect to the respective filling channels 130 in a fluid-conducting manner. A filling means 400 is connected via two hoses 420 to the filling channel 130 containing the conveying and/or mixing means 132. The mixing compound 200 is supplied to the cold casting mold 100 via the hoses 420. The exemplary embodiment shown here is particularly well suited for mixing compounds 200 which are composed of, for example, two components. The components can first be supplied separately to the filling channel 130 via the two hoses 420 and mixed with one another there by means of the conveying and/or mixing means 132 before the mixed mixing compound 200 enters the cavity 110 through the first opening 111.
[0101] A fifth exemplary embodiment of a cold casting mold 100 according to the invention can be seen in FIG. 7 in a schematic side view. Along the external walls 121 delimiting the cavity 110, the cold casting mold 100 is integrally formed with two wall reinforcements or projections 123, each like a flange. The section of the corresponding external wall 121 located between the wall reinforcements 123 is produced having a lesser wall thickness than the wall reinforcements 123 and is therefore used as a predetermined breaking point 124. By inserting an eccentric tool 125 between the two wall reinforcements 123, the cold casting mold 100 can be “levered open” along the predetermined breaking point 124 in order to detach the cold casting mold 100 from the mixing compound 200 cured therein.
[0102] The mixing compound 200 cured to the final hardness required for dental molded parts 210 can be seen in FIG. 8 is a finished molded part 210, which was produced using the cold casting mold 100 designed as a test specimen. The molded part 210 has wall thicknesses in a range from 0.3 mm to 10 mm. A lower, apical section of the molded part 210 is formed having a recess 211, the shape of which corresponds to the shape of an abutment for placing a dental molded part 210, for example a crown. The inward facing walls of the recess 211 are provided with a nubby surface 212 due to the plurality of second openings 112 which penetrate the inner walls 122 of the cold casting mold 100 in a sieve-like structure (see FIG. 2). The nubby surface 212 improves the hold between the dental molding 210, for example a crown and, for example, the abutment.
[0103] FIG. 9 shows the cold casting mold 100 from FIG. 4 in a sectional view. The cavity 110 of the cold casting mold 100 is filled here with different mixing compounds 201, 202, 203, 204 via a filling means 400. The mixing compounds 201, 202, 203, 204 each contain additives that are suitable for coloring and/or producing opacity of the finished molded part 210. Each of the mixing compounds 201, 202, 203, 204 is preferably filled into the cavity 110 via its own filling channel 130 and the respective first opening 111 adjoining it.
[0104] FIGS. 10 and 11 each show a schematic sectional view of a cavity 110 filled with different mixing compounds 201, 202, 203, 204. For example, the lower, apical section of the cavity 110 can be filled with a third mixing compound 203, two outer, occlusal sections with a first mixing compound 201 and a fourth mixing compound 204, respectively, and an occlusal section in between with a second mixing compound 202. After the curing and/or solidifying to final hardness, the finished dental molded part 210 then has regions or sections of different colors or tooth colors and/or different opacities or transparencies.
[0105] FIG. 12 shows a flow chart of an exemplary sequence of the method according to the invention for producing a dental molded part 210. For this purpose, a cold casting mold 100 is first provided or produced (1). The cold casting mold 100 is constructed by means of an additive material construction method, for example using a 3D printer, wherein the cold casting mold 100 has at least one first opening 111 and at least one second opening 112. A thermally and/or thermochemically decomposable plastic is preferably used as the starting material 150. Optionally, the cold casting mold 100 can already be formed having one or more predetermined breaking points 124 during production. Optionally, the cold casting mold 100 can be coated with a coating agent 220 before it is filled with the mixing compound 200 (1.1). Petroleum, for example, is suitable as the coating agent 220, wherein the cold casting mold 100 is preferably immersed in a basin containing petroleum. The cold casting mold 100 is then filled with the mixing compound 200 (2). Depending on the desired molded part 210, the mixing compound 200 comprises a ceramic, a metal, or a plastic powder 209, which is suitable for the production of dental molded parts. The respective powder 209 is preferably mixed with a diluent 205, for example water or an organic solvent, to form a slurry or a pasty mass, admixed with a binder 206, and conditioned before use. The mixing compound 200 is filled into the cavity 110 of the cold casting mold 100 via the at least one first opening 111. Fluids 207 contained in the mixing compound 200, in particular the diluent 205 or air inclusions 208, can already escape via the at least one second opening 112 during the filling. After the filling, the mixing compound 200 cures inside the cold casting mold 100, more precisely in its cavity 110 (3). In order to accelerate curing, the cold casting mold 100 is placed, for example, in a drying cabinet or climatic cabinet to set a desired ambient humidity of the environment, and heat 230 is applied, so that the liquid components of the mixing compound 200 dry or evaporate more quickly. Here, fluids 207, diluents 205, or air inclusions 208 can continue to escape via the at least one second opening 112 and optionally also via the at least one first opening 111. For the production of dental molded parts 210 from plastic, the cold casting mold 100 is made transparent and is exposed to light 231, in particular UV light. In the case of dental plastic, curing in the cold casting mold 100 to final hardness is possible. For the production of ceramic or metallic dental molded parts 210, the curing in the cold casting mold 100 is preferably carried out up to green body hardness. The stability of the green body can be achieved by the binder 206 used.
[0106] After the curing, the cold casting mold 100 can optionally be plasticized (3.1). For this purpose, the cold casting mold 100 is placed in a sintering furnace together with the hardened mixing compound 200 located therein and a temperature in a range from 35° C. to 300° C., in particular from 50° C. to 300° C., is set inside the sintering furnace. The plastic of the cold casting mold 100 softens and can, for example, be “inflated” by blowing in compressed air 232 and detached from the mixing compound 200. In the case of a dental plastic molded part 210, the cold casting mold 100 is opened by the action of mechanical force along one or more predetermined breaking points 124 formed during production (4.B) and the finished dental molded part 210 is removed.
[0107] For the production of ceramic or metallic dental molded parts 210, the cold casting mold 100 is thermally or thermochemically decomposed (4.A) before or while the mixing compound 200 cures to final hardness. For this purpose, the cold casting mold 100 is placed in a sintering furnace together with the mixing compound 200 located therein and thermal decomposition or pyrolysis in the absence of oxygen or thermochemical decomposition or combustion with oxygen at a temperature in a temperature range from 200° C. to 650° C. is initiated, during which the starting material 150 is completely or almost completely dissolved. At a temperature in a temperature range from 650° C. to 1300° C., the mixing compound 200 can optionally be pre-sintered (5.1), wherein the binder 206 evaporates. During the ultimate final or dense sintering (5), the mixing compound 200 is compacted to final hardness at a temperature in a temperature range from 900° C. to 2500° C. and can be removed from the sintering furnace as a finished dental molded part 210. Any remnants of the cold casting mold 100 that are not yet completely decomposed are also decomposed during pre-sintering or final sintering.
[0108] FIG. 13 shows a schematic representation of a possible filling of the cold casting mold 100 from FIG. 2 by means of electrophoresis, in particular electrofiltration. The filling means 400 is designed here in the manner of an electrophoretic device. For electrofiltration it is necessary for the mixing compound 200 to be conductive, for example to comprise a metallic powder, whereas the cold casting mold 100 is optionally produced as an insulator, for example made of plastic or also conductive, made of conductive polymers. The at least one first opening 111 of the cold casting mold 100 is conductively connected to a cathode 430 of the filling means 400 via the mixing compound 200. The plurality of second openings 112 is also conductively connected to an anode 431 of the filling means 400 via the conductive mixing compound 200. By applying a voltage via a voltage source 432, an electric current can be generated which causes a particle transport from the cathode 430 to the anode 431. Experiments have shown that approximately 80% of the diluent 205 already escapes from the mixing compound 200 during the electrophoretic filling of the cold casting mold 100, which results in a considerably shorter process time. The residual moisture content remaining in the mixing compound 200 escapes, as described in detail above, via the plurality of second openings 112, in particular via porous and/or hygroscopic surfaces formed by them, until the mixing compound 200 cures and/or solidifies. The first opening 111 arranged in the region of the cathode 430 or a filling channel 130 adjoining it is preferably provided with a tubular siphon 433 which, in the case of aqueous mixing compounds 200, allows the hydrogen which forms there to escape in order to ensure the homogeneity of the mixing compound 200.
[0109] FIG. 14 shows a schematic sectional representation of the cold casting mold 100 from FIGS. 1 and 2, which is filled pneumatically with mixing compound 200 under the action of pressure. This method is particularly suitable for homogeneous filling of powdery mixing compounds 200, but also for slurries or pasty masses. For the filling, the cold casting mold 100 or its cavity 110 is used like a vacuum cleaner bag, wherein the pressure present within the cavity 110 is lower than the ambient pressure. This can either be implemented by the mixing compound 200 being supplied to the cavity 110 via a pressurized conveying line 440 of the filling means 400 embodied here as a pressure device. The mixing compound 200 can be introduced into the delivery line 440 with the aid of rotary valves, pressure vessels, and/or pressure conveying systems.
[0110] Alternatively or additionally, a vacuum can also be generated in the cavity 110 of the cold casting mold 100, as a result of which vacuum conveying or also suction conveying of the mixing compound 200 is implemented. A vacuum is generated centrally or decentrally using a vacuum generator 441 in order to suction in mixing compound 200 via the at least one first opening 111 and to transport it into the cavity 110 of the cold casting mold 100. The mixing compound 200 is held back in the interior of the cavity 110 via the plurality of second openings 112 or the wall sections lying between them. The conveying air 442 used to convey the mixing compound 200 passes through the plurality of second openings 112 and is supplied from the environment via a particle filter 443. The control of the filling is simplified via a bypass channel 444 which is connected in a fluid-conducting manner to the filling channel 130.
[0111] Finally, FIG. 15 shows an exemplary embodiment of the invention, in which the cold casting mold 100 has a cavity 110 which corresponds to the geometry of a dental molded part 210. In addition, a pressure nozzle 310 of a 3D printer 300 is schematically indicated in the figure, by means of which the cold casting mold 100 is additively constructed integrally from the starting material 150. The cold casting mold 100 comprises a first opening 111 which connects to a filling channel 130 in a fluid-conducting manner via a valve-controlled compensating volume 131. The cavity 110 is filled with the mixing compound 200 via the filling channel 130 using a filling means 400, here by way of example an injection syringe 420. Fluids 207 contained in the mixing compound 200 or air inclusions 208 occurring during filling are discharged from the cavity 110 via a plurality of second openings 112. The second openings 112 are formed here as capillaries or pores in the external walls 121 and are therefore not visible to the naked eye. The large number of second openings 112 creates a porous or hygroscopic surface, which conducts fluids 207 or moisture contained in the mixing compound 200 out of the cavity into the external environment.
LIST OF REFERENCE SIGNS
[0112] 100 cold casting mold [0113] 110 cavity or tool shape [0114] 111 first opening [0115] 112 second opening [0116] 120 wall [0117] 121 external wall [0118] 122 internal wall [0119] 123 wall reinforcement/wall projection [0120] 124 predetermined breaking point [0121] 125 eccentric tool [0122] 130 filling channel [0123] 131 compensating volume [0124] 132 conveying and/or mixing means [0125] 140 support structure [0126] 150 starting material [0127] 200 mixing compound [0128] 201,202, [0129] 203,204 mixing compound having additives [0130] 205 diluent [0131] 206 binder [0132] 207 fluids [0133] 208 air inclusions [0134] 209 powder [0135] 210 molded part [0136] 211 recess [0137] 220 coating agent [0138] 230 heat/ambient humidity [0139] 231 light [0140] 232 compressed air [0141] 300 3D printer [0142] 310 pressure nozzle [0143] 400 filling means [0144] 410 hose [0145] 420 Injection syringe, in particular low-pressure injection syringe [0146] 430 cathode [0147] 431 anode [0148] 432 voltage source [0149] 433 tubular siphon [0150] 440 conveyor line [0151] 441 vacuum generator [0152] 442 conveying air [0153] 443 particle filter [0154] 444 bypass channel
Method Steps:
[0155] 1 providing and/or producing a cold casting mold [0156] 1.1 coating the cold casting mold [0157] 2 filling the cold casting mold with mixing compound [0158] 3 curing and/or solidifying the mixing compound in the cold casting mold [0159] 3.1 plasticizing the cold casting mold [0160] 4.A thermally or thermochemically decomposing the cold casting mold [0161] 4.B mechanically separating cold casting mold and mixing compound [0162] 5.1 pre-sintering [0163] 5 sintering
