Fluid-carrying receiving body for a pressure medium conveying device and pressure medium conveying device with such a receiving body, as well as a method for manufacturing a receiving body

Abstract

Fluid-carrying receiving body (10) for a pressure medium conveying device (1) of a motor vehicle, wherein the receiving body (10) is a housing for an internal fluid energy machine, wherein the receiving body (10) is made of a thermosetting plastic material, wherein the receiving body (10) comprises at least a first receiving opening and a second receiving opening, wherein the first and the second receiving opening are fluidically connected to each other via a fluid-carrying channel, wherein the fluid-carrying channel is located in a monolithically designed area of ​​the one-piece receiving body (10), as well as a pressure medium conveying device (1) with such a receiving body and a method for manufacturing such a receiving body.

Description

The invention relates to a fluid-carrying receiving body for a pressure medium conveying device of a motor vehicle according to the preamble of claim 1 and a pressure medium conveying device for a hydraulically or pneumatically operated motor vehicle system according to the preamble of claim 4. Furthermore, the invention relates to a method for manufacturing a receiving body according to the preamble of claim 8. Fluid power machines are used in motor vehicles to generate hydraulic or pneumatic pressure in a wide variety of designs. For example, brake control systems are known in which a piston pump generates the hydraulic pressure for the vehicle's wheel brakes. In this system, the piston of the piston pump is located within a block-shaped housing and is driven by an electric motor directly attached to the housing. Channels within the housing connect, for example, a pressure chamber, through which the piston travels, to a receiving port on the outside of the housing. This allows the wheel brakes to be connected to the housing via hoses and thus supplied with pressurized hydraulic fluid. Furthermore, an electronic control unit is also mounted directly on the housing in such a unit.It serves not only to control the electric motor but also to actuate electromagnetically operated switching valves, which are housed in receiving openings of the mounting body. The actuator units of the switching valves are thus enclosed in the receiving openings of the mounting body and can be actuated by solenoid coils located within the electronic control unit. These receiving openings of the switching valves are also fluidically connected to the pressure chamber and the receiving openings for the hose lines via internal channels. Such a brake control device is known, for example, from DE 10 2018 214 565 A1. A mounting body for such a brake control device is typically manufactured from aluminum. Such a mounting body is known, for example, from DE 10 2016 208 365 A1. The mounting openings, bores for the pistons, and internal channels can be created by drilling or milling. However, this manufacturing process limits the bores, mounting openings, and channels to axial or linear orientations within the mounting body. Complex geometries are therefore hardly possible or only achievable with extreme effort. To connect all mounting openings and bores according to the hydraulic circuit diagram, bores are created that are not required for fluid flow and are subsequently sealed or left blank. Furthermore, the bores and openings that terminate on the outside must be sealed. The sealing of the bores is achieved, for example, by...by crimping lids or balls, which represents an additional assembly step. Furthermore, machining has the disadvantage of being complex and expensive. Additionally, the channels, inserted from various sides, are connected to the receiving openings via sharp edges, or the channels themselves terminate in the receiving openings with a sharp edge. This is extremely detrimental from a fluid dynamics perspective, as it leads to turbulence in the fluid, which negatively impacts the flow. These units are also known for generating compressed air for the air suspension system of a motor vehicle. For example, DE 10 2014 207 509 A1 describes a compressed air supply device with a receiving body in which a piston compressor is arranged, which is configured to generate pneumatic pressure. An electric motor for driving the piston compressor and an air dryer are arranged on one side of the receiving body. Opposite this is an electronic control unit on the receiving body. Here, too, electromagnetically actuated switching valves are installed in receiving openings, with these receiving openings being connected to a piston bore and pneumatic connection ports via channels drilled into the receiving body. How the various receiving openings for switching valves and hose lines, as well as the cylinder bores of the reciprocating pistons, are connected to each other by means of channels in such a receiving body is described, for example, in...from DE 10 2016 205 456 A1. To reduce the weight of a metal or aluminum receiving body, an assembly has already been proposed whose receiving body is made of a thermoset plastic material. This is known from DE 10 2019 210 810 A1. According to this prior art, the thermoset receiving body is manufactured in two housing parts, which are produced by injection molding and then joined together in a pressure-tight manner. This means that the receiving openings and channels are formed by the mold shells in the injection molding process. In particular, the channels are created in the parting line, as this can be easily formed in the injection molding process. A disadvantage, however, is that the split housing halves must be joined together in a pressure-tight manner using a gasket. Furthermore, the injection molding of thermosets does not allow for undercuts or geometries that cannot be formed by the mold halves or additional slides.There are also limitations to mechanical post-processing, because undercuts or cavities cannot always be represented by tool machining. WO 2008 / 003 279 A2 discloses a vacuum pump for a brake booster, which comprises a pump housing part made of a thermosetting plastic material. The pump housing part is formed using an injection mold with two mold halves, simultaneously creating a connecting groove between a contact surface for the check valve diaphragm and a contact surface for the seal. German patent DE 38 20 574 A1 describes a process for manufacturing hollow plastic bodies with a lost-wax core. Various materials are proposed for the core, such as wax, salt, salt-sand mixtures, and polyethylene resin. Finally, another method for manufacturing a fiber composite component using a lost mold core is known from DE 10 2010 033 288 A1. It is therefore an object of the invention to provide an improved receiving body for a pressure medium conveying device, made of a thermoset plastic material, which overcomes the disadvantages of the prior art, and to provide a pressure medium conveying device with such a receiving body. Furthermore, the object of the invention is to provide a method for manufacturing a receiving body from a thermoset plastic material, which enables a complex internal geometry and is also cost-effective. The problem is solved by the features of the independent patent claims. Preferred embodiments are described in the respective dependent claims. A fluid-carrying receiving body is provided for a pressure medium conveying device of a motor vehicle, wherein the receiving body represents a housing for an internal fluid energy machine, wherein the receiving body is made of a thermosetting plastic material, wherein the receiving body comprises at least a first receiving opening and a second receiving opening, wherein the first and the second receiving opening are fluidically connected to each other via a channel, characterized in that the fluid-carrying channel is located in a monolithic area of ​​the one-piece receiving body, wherein, according to the invention, the channel is designed to be curved at least in sections. According to the invention, the fluid-carrying channel is created by representing it through a lost mold core, wherein the lost mold core is made of a thermoplastic polymer material, wherein the melting point of the thermoplastic mold core is lower than a melting point of the thermoset receiving body. The housing is suitable for both liquids and gases. It can be used in hydraulic and pneumatic systems. To save weight and allow for complex component geometries, the housing is made of a thermoset plastic material. Thermosets are ideally suited for this application because they are high-strength and gas-tight. The housing serves as a casing for a fluid power machine, which generates fluid pressure. For example, a piston pump or piston compressor is used as the fluid power machine. To accommodate the pistons or other components, the housing includes a first and a second opening. These are fluidically connected via at least one channel formed within the housing material. The housing is thus manufactured as a single piece.It does not consist of two or more housing parts that are mechanically connected. The entire receiving body is therefore made of a single plastic material mixture or compound. Consequently, the fluid-carrying channel is located within a monolithic section of the receiving body. Monolithic means that the receiving body is made from a single piece of material. Preferably, a curved channel section is located centrally in the channel connection between the two receiving openings, or alternatively, the curved channel section opens into the receiving opening at a shallow angle along a longitudinal axis of the receiving opening. A curved channel section is defined as one that is not straight or linear, but rather has a bend. In other words, a channel section is always in the shadow of an imaginary beam path defined by the receiving aperture. Due to the curved channel section, the linear beam entering the first receiving aperture cannot reach the second receiving aperture or escape from it. The curved channel section has the advantage of being aerodynamically optimized compared to prior art designs. Furthermore, turbulence and noise can occur, which are reduced by the optimized channel shape. Unlike sharp edges or sharp angles in a channel, or at the point where a channel enters a receiving aperture, no turbulence is generated in the fluid with a curved channel or at a curved channel entry into a receiving aperture.This significantly improves the fluid flow inside the receiving body. The fluid-carrying channel in the receiving body is formed by a mold core, which acts as a negative mold representing the channel to be created. The channel is then created inside the receiving body by overmolding the thermoplastic mold core with the thermoset plastic material of the receiving body and subsequently discarding the mold core. By heating the receiving body above the melting point of the thermoplastic material of the mold core, the latter can be removed from the thermoset receiving body. Preferably, the first and second receiving openings are created by the lost core or by further lost cores attached to the lost core. The core can be used to create not only the channel but also openings in the receiving body. Preferably, the first receiving opening is configured as a cylinder bore for a piston, and the second receiving opening is for a hose connection or a switching valve. Hydraulic or pneumatic components such as pistons, switching valves, or hoses can be inserted or connected into the receiving openings or cylinder bores created by means of the mold core. In particular, if a switching valve is inserted into a receiving opening and the curved channel section opens into it, this is advantageous from a flow engineering perspective for switching the switching valve compared to a sharp or angled entry into the receiving opening. The invention further relates to a pressure medium conveying device for a hydraulically or pneumatically operated motor vehicle system with the fluid-carrying receiving body described above, wherein the pressure medium conveying device further comprises an electric motor which is directly arranged on a first housing side of the receiving body and an electronic control unit which is directly arranged on a second housing side of the receiving body, wherein the first and the second housing sides are opposite each other. Preferably, the electric motor is configured to drive a fluid energy machine located in the housing, preferably a piston pump or a piston compressor. Particularly preferably, the first housing side is opposite the second. According to a further preferred embodiment, the first housing side of the receiving body comprises at least one receiving opening in which an electromagnetically actuated switching valve is received, wherein the electromagnetically actuated switching valve can be actuated by a solenoid coil located in the electronic control unit. Another aspect of the invention is a method for manufacturing the previously described receiving body, wherein in a first step at least one expendable mold core is produced from a thermoplastic material, which, as a negative mold, represents the channel to be created in the receiving body, wherein in a second step the mold core is positioned in a cavity, wherein the receiving body to be produced is created in the cavity, and in a third step the expendable mold core is thermally dissolved by heating. First, an expendable mold core is produced. This represents the internal geometry of the receiving body. In the second step, the mold core is positioned in a cavity of an injection mold or in two mold halves that form the cavity, wherein the injection mold or...The mold halves represent the outer geometry of the receiving body, and then the receiving body is formed or injection-molded around the mold core in the cavity. Afterwards, the injection mold or cavity is preferably heated so that the components within it, such as the receiving body and mold core, also heat up. This heating occurs above the melting point of the mold core, causing it to thermally dissolve. That is, the mold core liquefies or melts, or its molecules transition into a gaseous state. Alternatively, thermal dissolution can be carried out in an external process, for example, in an oven or similar device. The receiving body, with its internal and external geometry, is then fully produced. Preferably, the lost mold core is produced by an injection molding process or by an additive manufacturing process. When heated in a cavity or oven, the thermoset plastic material of the receiving body preferably hardens simultaneously. This renders it non-deformable. Thermoset plastics are plastics that, once hardened, cannot be reshaped by heating or other means. After hardening, they no longer have a melting point and undergo pyrolysis. In this sense, the melting point of the thermoset receiving body is higher than that of the thermoplastic mold core. Thus, the mold core melts before the receiving body would decompose pyrolytically. The process is therefore characterized by the fact that during or after the hardening process of the receiving body, if the melting temperature of the mold core is exceeded, the core liquefies or outgasses and can thus be easily removed from the final receiving body. This can occur, for example, through pressure or gravity, or even chemically. To facilitate the dissolution of the thermoplastic mold core, it preferably has a lower melting point than the thermoset receiving body. This allows the mold core to decompose while the receiving body remains intact. Further preferred embodiments of the invention will become apparent from the following description of an exemplary embodiment with reference to the figures. Figure 1 shows an exemplary receiving body in a transparent view, Figure 2 shows a mold core as a negative for the receiving body, Figure 3 shows the manufactured receiving body, Figure 4 shows a pressure medium conveying device with the exemplary receiving body, and Figure 5 shows a flow diagram for the production of such a receiving body. Figure 1 is intended to illustrate the basic features of the exemplary receiving body 10. Receiving body 10 is shown in a through view, revealing an internal mold core 20. Receiving body 10 is made of a thermosetting plastic material. Thermosets are ideally suited for hydraulic or pneumatic applications because they are high-strength and gas-tight. By manufacturing receiving body 10 from a high-strength and gas-tight plastic, the design freedom is increased compared to receiving bodies typically made of aluminum. Thermosets are generally very hard and are therefore suitable as an adequate replacement for metallic materials. Thermosets, also called thermosetting plastics, are plastics that cannot be deformed after curing by heating or other means. They contain hard, amorphous, insoluble polymers.Therefore, these plastics possess the essential material property of a highly cross-linked structure and are simultaneously lightweight and cost-effective. Thermosets are thus easy to process and can be shaped as desired using established injection molding techniques, enabling more flexible and, in particular, non-machining manufacturing processes. The thermosetting materials used include phenol-formaldehyde (PF), urea-formaldehyde (UF), melamine-formaldehyde (MF), epoxy (EP), and unsaturated polyesters (UP). Ultimately, a thermoset plastic exhibits higher chemical resistance, and the necessary corrosion protection of a metallic substrate is eliminated. A thermoplastic material is used as the mold core 20. This thermoplastic material has a melting point above which it becomes soft and deformable, meaning it is thermally reversible. If the material, or the mold core 20, is heated above its melting point, it begins to melt. Therefore, a thermoplastic material is ideally suited as a mold core for a receiving body made of thermoset plastic, since its melting point is always higher than that of a thermoplastic. Figure 2 illustrates the mold core 20 and its geometry in more detail. The mold core 20 can be manufactured, for example, by injection molding or additive manufacturing. Since the expendable mold core 20 is designed as a solid body without any internal geometry or undercuts, it can be easily produced by injection molding. In the embodiment shown, the mold core 20 is a single piece and comprises various mold core sections for different openings in the receiving body to be produced. However, the mold core 20 can also be assembled from multi-part mold core sections for the individual openings of the receiving body to be produced. The individual mold core sections, which form openings and bores in the receiving body to be produced later, are explained below. Mold core 20 forms a mold core section 21 for a crankcase opening. The pistons will later be mounted on the eccentric of an electric motor via this crankcase opening in the receiving body. Mold core section 21 is connected to a mold core section 22 for an electric motor contact connector. The essentially axially produced mold core section 21 for the crankcase opening transitions perpendicularly into a mold core section 23 for a first piston and, opposite this, into a mold core section 24 for a second piston. Thus, mold core sections 23 and 24 create cylinder bores in the receiving body for the pistons. Next to mold core section 24 are a mold core section 25 for a filling port and a mold core section 26 for a draining port.Both mold cores 25 and 26 terminate on the same side as mold core sections 21 and 22. On the opposite side of mold core sections 23 and 24, at least five mold core sections 28 to 32 are formed, extending in the same direction as mold core sections 21, 22, 25, and 26. Mold core sections 28 to 32 serve to create receiving openings for hose connections to be attached to the receiving body. Mold core sections 28 to 32 are each connected to further mold core sections 33 to 37, which provide receiving openings for switching valves to be inserted into the receiving body. Mold core sections 33 to 37 extend downwards in the opposite direction to mold core sections 28 to 32. A further mold core section 27 is formed laterally, providing a receiving opening for an air dryer connection or another hydraulic or pneumatic component. As an example, the aforementioned mold core sections are connected to one another by means of curved mold core sections 40 for the channels in the receiving body. Since the exemplary mold core 20 comprises various mold core sections 40 for the channels, for the sake of simplicity, only a few of them have been designated with the reference numeral 40. A mold core section 40 is understood to be all sections recognizable in Fig. 2 that create a connection between the aforementioned mold core sections 21 to 37. The individual mold core sections for the various functions or for receiving various components in the receiving body to be produced, and the connecting channels in the receiving body, are created according to a hydraulic circuit diagram or pneumatic circuit diagram of the respective vehicle system.The essential components of such automotive systems, such as pistons and electromagnetically actuated switching valves, as well as the connections for lines, are fluidically interconnected according to the circuit diagram. This is precisely what is represented by the receiving body and its internal geometry of receiving openings and channels. Figure 3 shows the finished receiving body 10. This comprises (in the direction of the image above) a first housing side 11 and, parallel to this (in the direction of the image below), a second housing side 12, which is not visible. Perpendicular to these two housing sides 11 and 12, a third housing side 13 (in the direction of the image front) is formed, and, parallel to this, a fourth housing side 14 is formed, which is not visible. The outer geometry of the receiving body 10 is created by the mold halves of an injection mold. In conjunction with the corresponding mold core section, this results in a connection port 5 on the first housing side 11 for filling and emptying. Furthermore, the respective mold core sections provide connections 6 for hydraulic or pneumatic actuators (only one connection has been designated with the reference numeral 6 for simplicity). Together with the corresponding mold core section, a crankcase opening 15 and a motor connector opening 16 are also created. Additionally, the corresponding mold core section creates a cylinder bore 17, which opens into the third housing side 13. The same applies to the fourth housing side 14. After the pistons are inserted, the cylinder bore 17 and its counterpart on the fourth housing side 14 are sealed pressure-tight with covers.Not visible on the second housing side 12 are the mounting openings for switching valves, which open into the essentially flat second housing side 12. On the fourth housing side 14, there is also a mounting opening for, for example, an air dryer or other components. Figure 4 shows a perspective view of an assembled pressure medium supply system 1 of a motor vehicle. In this case, it is a compressed air supply system. However, it could also be a hydraulic pressure supply system. The pressure medium supply system 1 comprises an exemplary housing 10, which serves as a central block for receiving further components of the pressure medium supply system 1. In particular, the housing 10 represents the casing of a fluid power machine located inside, not visible, especially a piston pump or a piston compressor. The fluid power machine is driven by an electric motor 2, which is arranged directly on the first casing side 11. The electric motor 2 is, for example, screwed to the housing 10.For this purpose, bores or threaded holes are provided in the receiving body, which open into the first housing side 11 and which can be formed either by the mold core or by the injection mold. An electronic control unit 3 is directly mounted on a second housing side 12, which is opposite the electric motor 2. It includes a connector 9 for connecting the hydraulic fluid delivery system 1 to the vehicle's electrical system. The housing of the electronic control unit is also screwed to the receiving body 10. The bores or threaded holes provided for this purpose, which open into the second housing side 12, can also be formed by the mold core or the injection mold. Furthermore, the previously mentioned connection port 5 is formed on the first housing side 11, and the connections 6 for consumers, such as air springs, hydraulic fluid reservoirs, or wheel brakes, are also formed on this side 11.In this case, an air dryer is also connected to the fourth housing side 14. Not shown are a number of electromagnetically actuated switching valves, which are inserted into the receiving openings on the second housing side 12 and can be driven by solenoid coils, which are arranged correspondingly in the electronic control unit 3. As previously explained, a key function of the receiving body 10 is to establish a fluidic connection between the individual bores and receiving openings. This is achieved through channels located within the receiving body 10. To represent these channels as simply and fluidically optimized as possible, they were formed using a lost core. In particular, the receiving body 10 produced in this way is characterized by its curved or arc-shaped channels, which are thus fluidically optimized. The appendix to Fig. 5 describes a manufacturing process for producing the exemplary receiving body. In a first step S1, a mold core made of a thermoplastic material is produced by injection molding in a mold tool. This core acts as a negative mold, representing the internal shape of the receiving body, including its channels, cylinder bore, receiving openings, and other features. This mold core is subsequently discarded. For example, a polypropylene homopolymer (PP-H) is used, which has a temperature resistance of 140°C and a melting point of 165°C. Furthermore, in this first step, it is possible to incorporate inserts or other components intended for the receiving body to be produced into the negative mold. In a second step, S2, the mold core is placed in a cavity of an injection mold. The injection mold can, for example, consist of two mold halves and represents the outer shape of the receiving body. A thermosetting plastic compound is then injected into the cavity, or the cavity is filled around the mold core to create the receiving body as a solid material. The temperature resistance of the mold core is not exceeded by the mold temperature. This is possible, for example, with a phenol-formaldehyde resin such as Vyncolit 2940W, as it has an injection temperature of 100°C and a mold temperature of less than 140°C. In a third step, S3, the lost mold core is thermally dissolved by heating. This preferably takes place in the cavity or injection mold, or externally in an oven. The thermoset receiving body has a higher melting point than the thermoplastic mold core. Dissolving the mold core creates cavities, channels, receiving openings, etc., in the receiving body. Simultaneously, heating the thermoset receiving body cures (anneales). This increases its temperature resistance above the melting temperature of the mold core. In general, this manufacturing process has the advantage of reducing the complexity of the tool geometry. Slides are not required, and more complex component geometries are possible. In particular, a flow-optimized connection geometry between the individual mounts for a wide variety of components is now achievable for the first time, something that could never be accomplished with conventional drilling and milling. This results in significant improvements in fluid flow when the example mount body is used as a hydraulic or pneumatic unit. A mount body has been created that cannot be produced in this way using state-of-the-art methods and also requires no mechanical post-processing. Reference symbol list 1 Pressure medium delivery device 2 Electric motor 3 Electronic control unit 4 Air dryer 5 Connection nozzle for filling and emptying 6 Consumer connection 7 Motor screw connection 8 Control unit screw connection 9 Plug connection 10 Mounting body 11 First housing side 12 Second housing side 13 Third housing side 14 Fourth housing side 15 Crankcase opening 16 Motor plug opening 17 Cylinder bore 20 Mold core 21 Mold core section, crankcase opening 22 Mold core section, electric motor contact plug 23 Mold core section, first cylinder bore 24 Mold core section, second cylinder bore 25 Mold core section, filling connection 26 Mold core section, emptying connection 27 Mold core section, air dryer connection 28 Mold core section, first hose connection 29 Mold core section, second hose connection 30 Mold core section, third hose connection 31 Mold core section, fourth hose connection 32 Mold core section, fifth hose connection 33 Mold core section, first mounting opening, switching valve34 Mold core section second receiving opening switching valve 35 Mold core section third receiving opening switching valve 36 Mold core section fourth receiving opening switching valve 37 Mold core section fifth receiving opening switching valve 40 Mold core section channel S1 first process step S2 second process step S3 third process step

Claims

Fluid-carrying receiving body (10) for a pressure medium conveying device (1) of a motor vehicle, wherein the receiving body (10) is a housing for an internal fluid energy machine, wherein the receiving body (10) is made of a thermosetting plastic material, wherein the receiving body (10) comprises at least a first receiving opening and a second receiving opening, wherein the first and the second receiving opening are fluidically connected to each other via a channel, characterized in that the fluid-carrying channel is located in a monolithic area of ​​the one-piece receiving body (10), wherein the channel is curved at least in sections, wherein at least the fluid-carrying channel is produced by means of a lost mold core (20), wherein the lost mold core (20) is made of a thermoplastic plastic material.wherein a melting point of the thermoplastic mold core (20) is lower than a melting point of the thermoset receiving body (10). Receiving body (10) according to claim 1, characterized in that the first and the second receiving opening are generated by the lost mold core (20) or by further mold cores attached to the lost mold core. Receiving body (10) according to claim 1 or 2, characterized in that the first receiving opening is a cylinder bore (17) for a piston and the second receiving opening is a receiving opening for a hose connection (5, 6) or for a switching valve. Pressure medium conveying device (1) for a hydraulically or pneumatically operated motor vehicle system, comprising a fluid-carrying receiving body (10) according to one of claims 1 to 3, and further comprising an electric motor (2) which is directly arranged on a first housing side (11) of the receiving body (10) and an electronic control unit (3) which is directly arranged on a second housing side (12) of the receiving body (10), wherein the first and the second housing side (11; 12) are opposite each other. Pressure medium conveying device (1) according to claim 4, characterized in that the electric motor (3) is configured to drive a fluid energy machine located in the receiving body (10), in particular a piston pump or a piston compressor. Pressure medium conveying device according to claim 4 or 5, characterized in that the first and second housing sides (11; 12) of the receiving body (10) are opposite each other. Pressure medium conveying device according to claim 6, characterized in that the first housing side (11) of the receiving body (10) comprises at least one receiving opening in which an electromagnetically actuated switching valve is received, wherein the electromagnetically actuated switching valve can be actuated by a solenoid coil which is located in the electronic control unit (3). Method for producing a receiving body (10) according to one of claims 1 to 3, characterized in that in a first step (S1) at least one lost mold core (20) is produced from a thermoplastic polymer material, which represents as a negative mold the channel to be produced in the receiving body (10), wherein in a second step (S2) the mold core (20) is positioned in a cavity, wherein the receiving body (10) to be produced is produced in the cavity and in a third step (S3) the lost mold core (2) is thermally dissolved by heating. Method according to claim 8, characterized in that the lost mold core (20) is produced by an injection molding process or by an additive manufacturing process. Method according to claim 8 or 9, characterized in that the receiving body (10) is produced by injection molding. Method according to one of claims 8 to 10, characterized in that in the third step (S3) a simultaneous curing of the thermosetting plastic material of the receiving body (10) takes place. Method according to one of claims 8 to 11, characterized in that a melting point of the thermoplastic mold core (20) is smaller than a melting point of the thermoset receiving body (10).

Images