Multi-part mold for sanitary appliances, method for opening and closing this mold, and plaster bench

Description

[0001] The invention relates to a multi-part casting mold for producing sanitary articles according to the preamble of patent claim 1. Furthermore, the invention relates to a method for opening and closing a casting mold according to claim 15, as well as to a plaster bench according to claim 18.

[0002] A casting mold of the type mentioned above is known, for example, from DE 43 10 876 A1. The casting mold, which is used for casting a washbasin, has two mold halves and a wedge-shaped core mold. The ceramic mass to be cast is pumped into the mold cavity between the mold halves and the core mold. The two mold halves are held together by a central clamping device. The ceramic body forming in the mold cavity of the casting mold is called a green body.

[0003] Since the mold must be prepared for the next casting process immediately after each casting cycle and thus opened and reassembled, both the core mold and the corresponding mold half are equipped with magnets. The magnets are firmly connected directly to the core mold and the corresponding mold half. Compressed air can be supplied via separate channels to detach the core mold from the corresponding mold half.

[0004] The use of core molds often leads to damage such as cracks or various deformations during demolding of the ceramic sanitary article being produced. In addition, the precisely defined positioning of the core mold proves to be difficult or time-consuming. The magnets previously attached directly to the core mold and the mold half exert relatively high holding forces, so there is a risk that the ceramic sanitary article to be cast will be damaged during demolding. On the other hand, the magnets lose their effectiveness after a certain number of casting processes, with the result that the core mold is no longer sufficiently fixed to the mold half. In addition, when magnets are attached directly to the core mold and the corresponding mold half, the position, shape, and size of the core mold and the mold half are fixed. Flexible use of the casting mold is therefore only possible to a limited extent.

[0005] Another casting mold for casting a toilet bowl which has such disadvantages is also known, for example, from EP 0 030 770 A1, whereby information on the use of compressed air can be found in Neil Sclater ET AL: "Mechanisms Actuated By Pneumatic Or Hydraulic Cylinders" In: "MECHANISMS & MECHANICAL DEVICES SOURCEBOOK", 2001), McGraw-Hill, New York, XP055415386, page 376.

[0006] The invention is therefore based on the object of providing a casting mold that enables a safe and gentle removal process of the core mold during demolding of the ceramic object to be produced. The invention is further based on the object of providing a method for opening and closing a casting mold and a plaster bench.

[0007] This object is achieved according to the invention by a multi-part casting mold having the features of claim 1. Furthermore, the object is achieved with regard to the method by the subject matter of claim 15. With regard to the plaster bench, the object is achieved by the subject matter of claim 18.

[0008] The invention is based on the idea of providing a multi-part casting mold for producing sanitary articles, which comprises at least one wedge-shaped core wedge and a core mold, and the at least one core wedge has a magnetic element. Furthermore, the core mold has at least one magnet displaceable by a pneumatic actuation device, which magnet can be connected to the magnetic element of the core wedge to fix the core wedge to the core mold.

[0009] The invention has the advantage that the pneumatically movable magnets ensure a particularly gentle detachment process of the core wedges from the core mold. The risk of damage to the ceramic molding is therefore significantly minimized. This not only optimizes the aesthetic appearance of the medical device being cast, but also leads to overall quality and production improvements. Since the pneumatically movable magnets can retain their magnetic state even in the event of a loss of compressed air, for example, due to a hose rupture or a malfunction of a compressed air source in the pneumatic actuation device, the reliability and safety of the casting process with the multi-part casting mold is guaranteed. The multi-part casting mold can therefore be optimally reused for a variety of casting processes in a timely manner.

[0010] A further advantage of the invention is the flexible use of the multi-part casting mold, since the movable magnets are not fixed in position to the core mold. Therefore, a wide variety of different core wedges can be fixed to the core mold using the movable magnets. This ensures a wide product variety. For example, specifically designed core wedges can be used to produce toilets that do not require a flushing rim to be cast in a separate mold.

[0011] In addition, the use of the aforementioned casting mold is independent of the pressure with which the ceramic mass to be cast is fed into the mold cavity. Therefore, the casting mold can be used flexibly for many types of casting processes, such as die casting or plaster casting. The flexible use of the casting mold makes it easier to insert and remove core wedges, such as waterline cores.

[0012] By means of the compressed air actuation device, which is mounted in the core mold, the core wedges can advantageously be attached to or detached from the core mold by one or more movable magnets each. In general, the core mold can comprise several movable magnets and therefore also several core wedges. The movable magnets can be moved into an open position and a closed position. In the closed position, the movable magnets are moved to an outer surface of the core mold. The movable magnets are in magnetic contact with the corresponding magnetic element of the core wedges. As a result, the respective core wedge can be fixed to the core mold through the magnetic connection. The open position means that the movable magnets are not connected to the core wedges and are moved towards the inside of the core mold. In other words, in the open position, the core wedges are not magnetically fixed to the core mold.

[0013] Preferred embodiments of the invention are specified in the subclaims.

[0014] According to the invention, the core mold has several tubular guides, in each of which the movable magnets can be variably moved toward an inner or outer side of the core mold. The movement of the movable magnets is achieved, in particular, by the compressed air actuation device. The compressed air exerts a force on the movable magnets, enabling their movement in a preferred direction. In this context, pneumatics is a simple and cost-effective technology.

[0015] In a preferred embodiment, the magnetic element of the core wedge is formed by a metallic surface or a metallic block. Preferably, the surface of the core wedge, which can be fixed to the core mold, is made of a metal. Metals such as iron, nickel, or cobalt are conceivable here. Ideally, the metallic surface or the metallic block of the core wedge is formed by a ferromagnetic material. It is also conceivable for the surface of the core wedge to be formed by a ferromagnetic alloy, such as an alloy of iron, aluminum, nickel, copper, and cobalt. This allows the metallic surface or the metallic block to be used as a permanent magnet, making the multi-part casting mold reusable for a variety of casting processes. This reduces the need for frequent replacement of the magnetic element of the core wedge.Other embodiments for the magnetic element, such as a magnetic foil or disc magnets, are conceivable.

[0016] Since the magnetic element is preferably made of a metallic material, rust formation can occur in the moist environment of the ceramic mass. In a preferred embodiment, the magnetic element and / or the movable magnet are therefore made of a rust-resistant material. This effectively protects the magnetic element and / or the movable magnet against corrosion. Preferred materials include stainless steels or their alloys. Furthermore, the protection against rust formation ensures friction-free movement of the movable magnets in the tubular guides of the core mold. This ensures the efficient functioning of the multi-part casting mold.

[0017] In a preferred embodiment, several movable magnets can be connected to a core wedge. This allows the core wedge to be fixed to the core mold particularly efficiently and securely. This prevents unwanted detachment of the core wedge from the core mold and resulting damage to the core wedge. Furthermore, the higher magnetic force of multiple magnets per core wedge allows for the use of heavier core wedges for the multi-part casting mold. Alternatively, the movable magnets can have different sizes or magnetic strengths.

[0018] Preferably, the weight of the at least one core wedge supported by the movable magnets is in the range of 1 to 3 kg or more. This allows for a wide variety of usable core wedges, which can be fixed to the core mold. Therefore, the multi-part casting mold can be flexibly used for different core wedges. Since several movable magnets can be connected to a core wedge, and thus heavy core wedges can also be used, the number of core wedges required for the casting mold can be reduced. This speeds up the entire production process and thus reduces the necessary production costs in the manufacture of sanitary articles.

[0019] The at least one core wedge is preferably wedge-shaped. Generally, several differently shaped core wedges can be fixed to the core mold by the movable magnets. The geometric shape of the several core wedges is advantageously adapted to the shape of the sanitary article to be cast. In the context of this application, the term "core wedge" is used not only for tapered geometric shapes, but also for various geometric shapes, such as concave shapes, which are adapted to the shape of the sanitary article to be cast.

[0020] Advantageously, the movable magnet has a surrounding O-ring, which protects the movable magnet against slurry and friction. In particular, the O-ring in the tubular guide of the core mold protects the movable magnet against both slurry and friction, and thus against mechanical wear. In addition, the O-ring can have a sealing effect, which further protects the movable magnet against rust formation in the moist environment of the ceramic mass. Likewise, the O-ring seals off impurities or dirt that may enter the core mold.

[0021] In a preferred embodiment, the movable magnet is attached to a connecting plate by a connecting means. The connecting plate is designed, for example, as a planar metallic plate that can be punched from sheet metal. In this way, the connecting plate can be manufactured cost-effectively. The connecting plate is preferably the connecting means between the pneumatic actuation device and the movable magnets. In other words, the pneumatic actuation device can raise or lower the connecting plate, whereby the movable magnets attached to the connecting plate are movable in the tubular guides of the core mold. The connecting plate and the pneumatic actuation device are expediently arranged in the core mold.For this purpose, the core mold can have a corresponding recess such that the connecting plate and the pneumatic actuation device are mounted in the core mold in a space-saving manner. It is also conceivable for the connecting plate and / or the pneumatic actuation device to protrude beyond the core mold.

[0022] The connecting means is preferably formed by at least one rod or a rail or a traction means. The embodiment of the rod as a connecting means between the displaceable magnet and the connecting plate is particularly preferred because it is simple and cost-effective to manufacture. For example, the rod can be formed by a metallic tube or a metallic rod, in particular a rod made of stainless steel. The displaceable magnet can be fastened to the rod, for example, by a force-fitting connection, in particular a screw connection. The rod can be attached to the connecting plate, in particular by a screw connection. The screw connection makes it particularly easy to exchange or replace individual rods and / or magnets when repairs are necessary.

[0023] In a particularly preferred embodiment, the length of the connecting means is variably adjustable. For example, the rod can be designed as a telescopic rod. The telescopic design of the rod allows for easy length adjustment of the movable magnets as needed. This allows for flexible use and thus also a flexible design of the multi-part casting mold. Therefore, a variety of different core wedges of different sizes, geometric shapes, or weights can be attached to the core mold. In general, the length of the individual connecting means of the multiple movable magnets can be designed differently.

[0024] In a further embodiment, the connecting plate is polygonal, particularly cross-shaped or star-shaped. The shape of the connecting plate can, for example, be rotationally symmetrical.

[0025] Ideally, the shape of the connecting plate depends on the number of movable magnets and the appropriate position of the movable magnets for attaching and securing the differently designed core wedges. The movable magnets are preferably mounted in an outer area of the connecting plate.

[0026] Preferably, the pneumatic actuation device is arranged centrally in the core mold. For this purpose, the core mold has a recess in which the pneumatic actuation device is located. This central arrangement allows the core wedges to be positioned precisely and in a space-saving manner.

[0027] The pneumatic actuation device advantageously comprises a pneumatic cylinder connected to air ducts. The pneumatic cylinder is formed by a working cylinder operated by compressed air, which preferably has a movable and extendable piston. The pneumatic cylinder can be formed by a single-acting or double-acting pneumatic cylinder. The principle of the pneumatic cylinder is based on the conversion of compressed air energy into mechanical energy. Therefore, work can be performed on the piston and the piston can be extended from an initial position. In single-acting pneumatic cylinders, the piston can be returned to its initial position with the aid of a spring. In double-acting pneumatic cylinders, the piston is moved exclusively by compressed air. The compressed air ensures both the piston movement and the return to the initial position.

[0028] The advantage of double-acting cylinders is that they utilize the full force of compressed air both when extending and returning to their original position. This can accelerate the extension and retraction process, saving time.

[0029] Preferably, the connecting plate is attached to the pneumatic cylinder for this purpose. In particular, the connecting plate is attached directly and centrally to the pneumatic cylinder. The connecting plate is connected, for example, to the piston of the pneumatic cylinder in a force-locking manner, in particular by a screw connection. Therefore, the connecting plate can be moved simultaneously by the piston movement of the pneumatic cylinder. The pneumatic cylinder thus also controls the movement of the movable magnets. In other words, the movable magnets are coupled to the pneumatic cylinder via the connecting plate. The pneumatic actuation device, in particular the pneumatic cylinder, therefore controls the movement of the movable magnets. The air ducts required to actuate the pneumatic cylinder for connection to a compressed air source can be guided in the recess of the core mold.

[0030] Furthermore, a base plate is advantageously attached to the pneumatic cylinder, in particular by means of a screw connection. The base plate allows the pneumatic cylinder to be easily and securely fastened to the core mold. For this purpose, the base plate can be connected to the core mold. The base plate is preferably attached to the pneumatic cylinder opposite the connecting plate.

[0031] Generally, the base plate can be mounted in a central recess of the core mold. The pneumatic cylinder can be mounted on a surface of the base plate. The connecting plate can be mounted on a side of the pneumatic cylinder opposite the base plate. This can be done, for example, by means of a screw connection. The connecting plate is mounted in the recess of the core mold so that it can be moved and / or shifted by the piston of the pneumatic cylinder.

[0032] The connecting plate can have a plurality of movable magnets, which can be attached to the connecting plate, in particular by a screw connection. The movable magnets are fastened to the connecting plate by a connecting means and movable in the tubular guides of the core mold. The movable magnets are attached to the connecting plate in such a way that they can be moved in a vertical direction, in particular downwards towards the base plate. The movable magnets are therefore movable laterally of the pneumatic cylinder. Since the movable magnets are preferably arranged on an outer region of the connecting plate, they have no contact with the base plate and the pneumatic cylinder. The movable magnets can be moved towards an inner or outer surface of the core mold. This allows core wedges to be fixed to or released from the core mold.

[0033] The invention further claims a method for opening and closing a casting mold, in particular according to one of the previously described embodiments. The method for opening and closing the casting mold can be considered part of a method for casting a sanitary article. Preferably, the at least one core wedge, which is magnetically fixed to the core mold, is introduced into a base mold and clamped. After the casting process, the at least one displaceable magnet is released from the core wedge by the compressed air actuation device, whereby the core wedge remains in the base mold and is subsequently removed individually.

[0034] In detail, in a starting position, the movable magnets can preferably be in a closed position. This means that they are displaced toward an outer surface of the core mold and are in magnetic contact with at least one core wedge. The core wedges are therefore fixed to the core mold. The at least one core wedge, which is magnetically fixed to the core mold, is inserted into a base mold and clamped. For this purpose, the core mold expediently moves toward a base mold. The movable magnets ensure precise positioning of the core wedges in the base mold.

[0035] The clamping of the base mold to the core wedges fixed to the core mold can be achieved, in particular, by a central clamping device. The base mold, together with the inserted core wedges, serves to shape the sanitary article to be produced. The base mold can expediently be designed in several parts and comprise at least one shell mold and one base mold. The base mold, together with the core mold, thus forms the casing for the ceramic mass to be introduced. The core wedges can be sealingly connected to the base mold by the clamping. The casting mold is thus preferably prepared for the introduction of the ceramic mass after the core wedges have been clamped in the base mold.

[0036] The so-called casting slip, a mixture of water, clay raw materials, and, for example, feldspar and quartz, can advantageously be introduced into the base mold via pipes. The base mold, i.e., at least one shell mold and the base mold, is preferably made of gypsum. The gypsum draws water from the casting slip. As a result, the casting slip immediately solidifies, and components adhere to the inner wall of the base mold. This creates a uniform layer for the molded part, or green body, in the base mold.

[0037] During the subsequent demolding, or after the casting process, the movable magnets can be moved into an open position, particularly by means of an automatic switch. The movable magnets are then released from the core wedges after the casting process by the pneumatic actuation device. The movable magnets are moved toward the inside of the core mold. The core mold can preferably also be moved away from the core wedges and the base mold. The pneumatic actuation device enables the core wedges to be gently removed from the core mold. The core wedges inserted into the base mold are no longer in contact with the movable magnets. The core wedges remain in the base mold and thus remain in contact with the green body. Because the core wedges remain in the base mold during demolding, they are not subjected to any tensile force or friction. This prevents and avoids cracks in the molded article.After the casting process, the core wedges can then be removed individually from the base mold and thus from the green body.

[0038] The movement of the movable magnets can be electronically controlled, in particular by a timer. For example, the movable magnets can remain in the open position for a specified period of time, in particular a few minutes, and then automatically return to the closed position after the specified period has elapsed.

[0039] After the casting process is complete, the core wedges can be reattached to the core mold using the movable magnet, making them ready for use in a new casting process. Ideally, the core wedges are removed one at a time from the base mold and thus from the green body and reattached to the core mold. The core mold is thus reusable for multiple casting processes, particularly 150 or more. The movable magnets allow the core mold to be quickly and easily repositioned for a subsequent casting process. Therefore, the production and manufacture of the sanitary article is efficient and time-saving. The process according to the invention can effectively improve the production and quality of the sanitary articles to be manufactured. Furthermore, the preparation time for the casting mold and the demolding time can be effectively reduced.

[0040] The invention further claims a plaster bench which comprises several, multi-part casting molds according to one of the previously described embodiments.

[0041] The invention will be explained in more detail below with reference to the attached schematic drawings, which show Fig. 1 is a perspective view of a core mold of a multi-part casting mold according to the invention according to a first embodiment, in which the walls are transparent for illustration purposes; Fig. 2 is a perspective view of an underside of the core mold according to Fig. 1 ; Fig. 3 a perspective view of the core shape according to Fig. 1 with fixed core wedges; Fig. 4a-d each show an exploded view of a multi-part casting mold according to the invention with a core mold according to Fig. 1 at different process times; Fig. 5 a further perspective view of a multi-part casting mold according to the invention with a core mold according to Fig. 1 .

[0042] Fig. 1 shows a perspective view of a core mold of a multi-part casting mold according to the invention according to a first exemplary embodiment, in which the walls are transparent for illustrative purposes. The casting mold can preferably be used for producing sanitary objects, in particular toilets. The multi-part casting mold comprises core wedges 30 (not shown here) and an oval-shaped core mold 1 with a straight lateral boundary. The core mold 1 has a central oval recess 2 in the center, which forms an opening for the attachment of a pneumatic actuation device in the core mold 1.

[0043] The pneumatic actuation device is formed by a pneumatic cylinder 13, which is mounted in the recess 2. The pneumatic cylinder 13 is attached, in particular by a screw connection, to a base plate 14. The base plate 14 is connected, for example, by a screw connection to the bottom surface of the recess 2 of the core mold 1. The pneumatic cylinder 13 is connected to air ducts 20 for the compressed air supply. The air ducts 20 are connected to an external compressed air source and can be led into the core mold 1 from outside.

[0044] A connecting plate 12 is mounted on the side of the pneumatic cylinder 13 opposite the base plate 14. The connecting plate 12 has a circular shape in the center with several elongated arms. The connecting plate 12 is connected to a piston of the pneumatic cylinder 13. The movement of the piston of the pneumatic cylinder 13 simultaneously moves the connecting plate 12.

[0045] Rods 11 are connected, in particular screwed, to the outer ends of the elongated arms of the connecting plate 12. The rods 11 are each aligned parallel to one another. The rods 11 are movable in associated tubular guides 15 of the core mold 1. The rods 11 are movably arranged in guides 15 laterally of the pneumatic cylinder 13. The guides 15 are therefore also aligned parallel in the core mold 1. On the side of the rods 11 opposite the connecting plate 12, displaceable magnets 10 are attached in a force-fitting manner, in particular by a screw connection. The displaceable magnets 10 can each be connected to a magnetic element of the core wedges 30 to fix the core wedges 30 (not shown) to the core mold 1. The movable magnets 10 can be moved by the central pneumatic actuation device in the associated guides 15 of the core mold 1.

[0046] The movable magnets 10 extend into an extension 3 within the guides 15 of the core mold 1. The extension 3 has different increments 4. The different increments 4 allow for different lengths of the rods 11. The movable magnets 10 are therefore not all located at the same height. Due to the height-staggered arrangement of the movable magnets 10 in the extension 3 of the core mold 1, core wedges 30 of different geometric shapes and / or sizes can be fixed to the core mold 1.

[0047] The core mold 1 can preferably be made of plastic. The rods 11 are, for example, made of stainless steel. The movable magnets 10 can comprise a ferromagnetic material, such as iron. Ideally, the rods 11 and the movable magnets 10 are made of a rust-resistant material.

[0048] The movable magnets 10 can be moved into an open and a closed position by means of the pneumatic actuation device. For this purpose, the movable magnets 10 can be moved towards an inner side of the core mold 1 or towards an outer surface. The movable magnets 10 are in Fig. 1 shown as an example in the open position, since they are not shifted towards the outer surface of the core mold 1.

[0049] Fig. 2 shows a perspective view of a bottom side of the core mold 1 according to Fig. 1 The core mold 1 has an oval shape with a straight lateral edge. An extension 3 is attached centrally to the underside of the core mold 1. The extension 3 is formed integrally with the core mold 1.

[0050] The extension 3 has several differently designed steps 4. The steps 4 can differ in their length and width. The individual guides 15 for the rods 11 of the movable magnets 10 are formed in the steps 4. The rods 11 thus extend in the guides 15 of the core mold 1 from the connecting plate 12 into the extension 3. The different steps 4 allow different lengths of the rods 11 to be realized. The movable magnets 10 are therefore not all at the same height. The height-staggered arrangement of the movable magnets 10 in the extension 3 of the core mold 1 allows core wedges 30 of different geometric shapes and / or sizes to be fixed to the core mold 1.

[0051] The core wedges 30 are preferably fixed to the extension 3 of the core mold 1. The different steps 4 are particularly adapted to the geometric shapes of the core wedges 30, which are fixed to the core mold 1. The movable magnets 10 can be moved into an open and a closed position by means of the pneumatic actuation device. For example, the movable magnets 10 are moved toward the outer surface of the extension 3.

[0052] Fig. 3 shows a perspective view of the core mold 1 according to Fig. 1 with fixed core wedges 30. The shape and structure of the core mold 1 is the same as in Fig. 1 described. A pneumatic actuation device is mounted in the central recess 2 of the core mold 1. The pneumatic actuation device is formed by a pneumatic cylinder 13, which is fastened in the recess 2 via a base plate 14. The pneumatic cylinder 13 is connected to air ducts 20 for the compressed air supply. The air ducts 20 are connected to an external compressed air source and can be routed from outside the core mold 1.

[0053] A connecting plate 12 is mounted on the side of the pneumatic cylinder 13 opposite the base plate 14. The connecting plate 12 has a circular shape in the center with several elongated arms. The movement of the piston of the pneumatic cylinder 13 simultaneously moves the connecting plate 12.

[0054] Rods 11 are connected to the outer ends of the elongated arms of the connecting plate 12. The rods 11 are movable in corresponding guides 15 of the core mold 1. Movable magnets 10 are attached to the side of the rods 11 opposite the connecting plate 12, particularly by means of a screw connection. The movable magnets 10 are movable in the corresponding guides 15 of the core mold 1 by the central pneumatic actuation device.

[0055] The movable magnets 10 extend into a cylindrical extension 3 within the guides 15 of the core mold 1. The extension 3 has different increments 4. The different increments 4 allow for different lengths of the rods 11. The movable magnets 10 are therefore not all at the same height.

[0056] The movable magnets 10 can be connected to a respective magnetic element of the core wedges 30 to fix the core wedges 30 to the core mold 1. The core wedges 30 can be fixed to the extension 3 of the core mold 1. For this purpose, the movable magnets 10 are mounted in a closed position. The movable magnets 10 are thus in contact with the respective magnetic element of the core wedges 30. The magnetic element of the core wedges 30 is embodied here, for example, as a metallic surface. The metallic surface can preferably be made of iron. As shown in Fig. 3 As can be seen, for large or heavy core wedges 30, several movable magnets 10 can also be connected to the respective core wedge 30.

[0057] As in Fig. 3 As can be seen, several core wedges 30 are fixed to the extension 3 of the core mold 1. The core wedges 30 are arranged above and below one another on the extension 3. The outer surface of the assembled core wedges 30 forms a user surface of the sanitary article to be manufactured. The core wedges 30 therefore have a shaping effect. The core wedges 30 can have wedge-shaped or conical shapes. In general, the geometric shape of the core wedges 30 is variable and adapted to the user surface of the sanitary article to be manufactured.

[0058] Fig. 4 shows an exploded view of a multi-part casting mold according to the invention with a core mold 1 according to Fig. 1 at different stages of the process. The casting mold is similar to the casting mold according to Fig. 3 and comprises a core mold 1 and several core wedges 30. The shape and structure of the core mold 1 are as shown in Fig. 1 described.

[0059] The movable magnets 10 are in Fig. 4a released from the core wedges 30 by the pneumatic actuation device.

[0060] The core wedges 30 are arranged and clamped in a base mold. The base mold is generally Fig. 4 formed by two shell molds 50 and a base mold 60. Together with the core wedges 30, the base mold forms a casing for the green body 40, which represents the formed ceramic mass that has not yet been fired. For illustrative purposes, the base mold, i.e., the shell molds 50 and the base mold 60, are shown in an exploded view. During the process, the shell molds 50 and the base mold 60 are clamped, i.e., firmly connected to one another, so that the ceramic mass can be sealed and introduced into the base mold. The base mold, together with the core wedges 30 and the core mold 1, serves to shape the green body 40.

[0061] The core form 1 is in Fig. 4a moved away from the core wedges 30 and the green body 40. In other words, the core wedges 30 inserted into the green body 40 are no longer in contact with the movable magnets 10. Since the core wedges 30 remain connected to the green body 40 during demolding, no tensile force or friction acts on the core wedges 30. Cracks in the green body 40 can thus be prevented and avoided.

[0062] The core wedges 30 can expediently remain in the base mold during the casting process and thus remain connected to the green body 40. They can then be removed individually and one after the casting process. For example, the core wedges 30 can be removed from the base mold, as indicated by the arrow direction, and thus removed from the green body 40.

[0063] Fig. 4b shows a state of the casting mold in which a first core wedge 30 has been removed from the base mold and thus from the green body 40. The core wedge 30 can be removed individually and manually. The core wedge 30 has a suitable recess on its inner side for fixation to the corresponding step 4 of the extension 3 on the core mold 1. Fig. 4c shows a further state of the casting mold, in which the first core wedge 30 is fixed to the extension 3 of the core mold 1. The movable magnets 10 are in a closed position.

[0064] Ideally, the core wedges 30 are removed one after the other from the base mold and thus from the green body 40 and fixed back to the core mold 1. In Fig. 4d All core wedges 30 are fixed to the core mold 1 one after the other. The casting mold can be used for a new casting process. The core mold 1 is thus reusable for multiple casting processes. The movable magnets 10 make the core mold 1 ready for a subsequent casting process in a short period of time.

[0065] Fig. 5 shows a further perspective view of a multi-part casting mold according to the invention with a core mold 1 according to Fig. 1 The base mold is formed by two shell molds 50 and a base mold 60 and is shown in the clamped state. This means that the shell molds 50 and the base mold 60 are sealingly connected to one another so that the green body 40, which is introduced into the base mold as a ceramic mass, receives its shape. Several core wedges 30 are introduced into the base mold by means of the core mold 1 and are thus connected to the green body 40. The core mold 1 is, for example, moved away from the base mold and thus the green body 40. The core wedges 30, together with the base mold, form the shape for the green body 40. Bezugszeichenliste

[0066] 1Core mold 2Recess 3Extension 4Step 10Magnet 11Rod 12Connecting plate 13Air cylinder 14Base plate 15Guide 20Air duct 30Core wedge 40Green body 50Shell mold 60Foot mold

Claims

1. A multi-part casting mould for producing sanitary objects, comprising at least one core wedge (30) of wedge-shaped design and a core mould (1), wherein the at least one core wedge (30) has a magnetic element, wherein the core mould (1) has at least one magnet (10) that can be displaced by means of a compressed air actuating device and can be connected to the magnetic element of the core wedge (30) in order to fix the core wedge (30) on the core mould (1), and wherein the core mould (1) has multiple tubular guides, in which the displaceable magnets can be respectively moved variably in the direction of an inner side or an outer side of the core mould (1).

2. The casting mould according to claim 1, characterized in that the magnetic element of the core wedge (30) is formed by a metallic surface or a metallic block.

3. The casting mould according to one of the preceding claims, characterized in that the magnetic element and / or the displaceable magnet (10) are made of a rust-resistant material.

4. The casting mould according to one of the preceding claims, characterized in that multiple displaceable magnets (10) can be connected to the core wedge (30).

5. The casting mould according to one of the preceding claims, characterized in that the weight of the core wedge (30) bearable by the displaceable magnets (10) lies in the range of 1 to 3 kg or more.

6. The casting mould according to one of the preceding claims, characterized in that the displaceable magnet (10) has an encompassing O-ring, by means of which the displaceable magnet (10) is protected against slurry and friction.

7. The casting mould according to one of the preceding claims, characterized in that the displaceable magnet (10) is fixed on a connecting plate (12) with the aid of a connecting means.

8. The casting mould according to claim 7, characterized in that the connecting means is formed by at least one rod or a rail or a traction means.

9. The casting mould according to claim 7 or 8, characterized in that the length of the connecting means is variably adjustable.

10. The casting mould according to one of claims 7 to 9, characterized in that the connecting plate (12) is realized polygonally, particularly cruciform or stellate.

11. The casting mould according to one of the preceding claims, characterized in that the compressed air actuating device is arranged centrally in the core mould (1).

12. The casting mould according to one of the preceding claims, characterized in that the compressed air actuating device comprises a compressed air cylinder (13) that is connected to air ducts (20).

13. The casting mould according to claim 12, characterized in that the connecting plate (12) is fixed on the compressed air cylinder (13).

14. The casting mould according to one of claims 12 and 13, characterized in that a base plate (14) is fixed on the compressed air cylinder (13).

15. A method for opening and closing a casting mould according to one of the preceding claims, characterized in that the at least one core wedge (30), which is magnetically fixed on the core mould (1), is introduced into a basic mould and tensioned therein, and in that the at least one displaceable magnet (10) is after the casting process separated from the core wedge (30) by means of the compressed air actuating device such that the core wedge (30) remains in the basic mould and is then removed individually.

16. The method for opening and closing a casting mould according to claim 15, characterized in that the core wedge (30) is once again fixed on the core mould (1) by means of the displaceable magnet (10) after the completion of the casting process and thereby usable for a new casting process.

17. The method for opening and closing a casting mould according to one of claims 15 and 16, characterized in that the core mould (1) can be reused for multiple casting processes, particularly 150 casting processes or more.

18. A gypsum mould bank comprising multiple multi-part casting moulds according to at least one of claims 1 to 14.