Molding method for manufacturing a single-piece component having at least one cavity

Abstract

A molding method for manufacturing a single-part component having at least one cavity inside, in particular a single-part component made of C-SMC, comprising the steps of preparing a press mold comprising a first half mold (1a), a second half mold (1b) and a movable side carriage defining a molding space (Vs) therebetween and placing at least one core (3, 4) inside the molding space (Vs). The core (3, 4) comprises a membrane (3) delimiting a receiving space (Vc) shaped to form at least one cavity of the single-part component and at least one connector (4) engaging the membrane (3). The method further comprises the steps of wrapping a mass of material to be molded (C) over the core (3, 4), fixing the core (3, 4) inside one of the first half mold (1a) and the second half mold (1b) and filling the receiving space (Vc) of the membrane (3) with a filler (R). After closing the half molds (1a, 1b), the method comprises the steps of applying a molding pressure and subsequently emptying the receiving space (Vc) of the filler (R) and removing the core (3, 4) from the molded single-part component after opening the half molds (1a, 1b).

Description

Technical Field

[0001] This invention relates to a molding method for manufacturing monolithic components having at least one internal cavity, particularly monolithic components made of C-SMC, and a machine for molding hollow monolithic components, which are widely used in the automotive industry, especially for manufacturing parts using C-SMC (carbon plate molding compound). Background Technology

[0002] Currently, C-SMC parts are manufactured using traditional compression molding techniques, which involve applying force to a mold to shape a single piece of C-SMC material. This molding technique produces relatively inexpensive, rigid, and complex single-walled monolithic parts.

[0003] Techniques are also known for processing components made of CFRP (carbon fiber reinforced polymer) to form highly rigid, high-strength parts. These properties are enhanced by the possibility of molding closed shapes that facilitate the manufacture of body-in-white (BiW) structural parts.

[0004] Disadvantageously, traditional techniques for handling C-SMC parts and those used for manufacturing CFRP components have inherent drawbacks in terms of the mechanical properties, cost, and cycle time of the finished parts.

[0005] Molding technology for C-SMC parts does not allow for the processing of internally hollow parts. On the other hand, the technology for CFRP parts is expensive and its productivity cannot meet market demand. Summary of the Invention

[0006] Therefore, the technical objective of this invention is to provide a molding method for manufacturing a single-unit component having at least one cavity inside, and a machine for molding a hollow single-unit component, which can overcome the above-mentioned defects of the prior art.

[0007] Therefore, the objective of this invention is to provide a molding method that allows the manufacture of monolithic elements, which are hollow and also have complex shapes, particularly by means of C-SMC.

[0008] Therefore, another objective of the present invention is to provide a molding method that allows hollow monomer components to be manufactured by C-SMC at a lower cost than conventional techniques.

[0009] The stated technical objective and designated goal are substantially achieved by a molding method and a machine comprising one or more of the technical features set forth in the appended claims. The dependent claims correspond to feasible embodiments of the invention.

[0010] More specifically, the technical objective is achieved by a molding method for manufacturing a monolithic component having at least one cavity inside, particularly a monolithic component made of C-SMC, which includes the step of preparing a mold that defines a molding space between a first half mold and a second half mold, one of the first half mold and the second half mold being movable via an oil circuit, and the other of the first half mold and the second half mold being fixed.

[0011] In one feasible implementation, the mold also includes side brackets that can move cooperatively with the half mold to define the molding space and allow molding of hollow single-unit parts with undercuts.

[0012] The method of the present invention further includes the step of placing at least one core within a molding space, wherein the core includes a membrane defining a receiving space that is shaped to form at least one cavity of a monolithic component and at least one connector engaged with the membrane and configured to allow filling of the receiving space, and the step of wrapping a strand of material to be molded, particularly a strand of C-SMC, around the core such that the core is at least partially immersed in the strand of material.

[0013] The method of the present invention further includes the steps of fixing the core in one of the first half-mold and the second half-mold, particularly in the fixed half-mold, filling the receiving space of the film with filler through the connector, and applying molding pressure on a strand of material after closing the half-mold (and, if necessary, a bracket).

[0014] Following the above steps, the method according to the invention further includes emptying the filling space and removing the core from the molded monolithic component after opening the half mold (and, if necessary, a bracket).

[0015] More specifically, the technical objective is also achieved by a machine for molding hollow monolithic components, particularly C-SMC components, which is configured to implement the method according to the foregoing and includes a die having a first half-die and a second half-die defining a molding space between them, wherein one of the first half-die and the second half-die is movable and the other of the first half-die and the second half-die is fixed. In a feasible embodiment, the die also includes side brackets, which are movable to allow molding of hollow monolithic components with undercuts.

[0016] The machine according to the invention further includes at least one core placed within a molding space and including a membrane defining a receiving space that is molded to form at least one cavity of a single-piece component. The core also includes at least one connector engaged with the membrane and configured to allow filling of the receiving space. The machine according to the invention also includes an oil circuit configured to make one of the first or second half-molds movable and to move the side brackets when needed, and a vacuum circuit configured to generate a negative pressure effect in the molding space.

[0017] Further features and advantages of the invention will become more apparent in the illustrative, and therefore non-limiting, description of the methods and machines for manufacturing hollow monolithic components, particularly C-SMC components. Attached Figure Description

[0018] The following description is based on the accompanying drawings, which are provided for illustrative purposes only and not for limiting the scope of the invention, wherein:

[0019] Figure 1 A schematic diagram of an embodiment of a machine for manufacturing hollow monolithic components, particularly C-SMC components, is shown.

[0020] Figure 2 A schematic diagram of another embodiment of a machine for manufacturing hollow monolithic components, particularly C-SMC components, is shown;

[0021] Figure 3 A schematic diagram of another embodiment of the machine according to the present invention is shown;

[0022] Figure 3A It shows Figure 3 A detailed schematic diagram. Detailed Implementation

[0023] Referring to the accompanying drawings, reference numeral M indicates a machine used for molding hollow monolithic components, particularly C-SMC components.

[0024] Machine M includes a mold having a first half-mold 1a and a second half-mold 1b, which define a forming space Vs for placing a strand of material C to be formed, particularly a strand of C-SMC, to obtain a hollow monolithic part.

[0025] Preferably, one of the first half mold 1a and the second half mold 1b of the molding die is movable, while the other half mold 1a and the second half mold 1b is fixed and receives a strand of material C to be molded.

[0026] In the embodiment shown in the attached figures, the second half-mold 1b moves toward and away from the fixed first half-mold 1a.

[0027] In another feasible implementation, the first half-mold 1a moves toward and away from the fixed second half-mold 1b.

[0028] Alternatively, both the first half-mold 1a and the second half-mold 1b can move toward and away from each other.

[0029] According to another aspect of the invention, the mold further includes a movable side bracket configured to allow molding of a hollow monolithic component having one or more undercut portions. In this case, the bracket also moves as the first half-mold 1a and the second half-mold 1b move and cooperates with the first half-mold 1a and the second half-mold 1b in order to define the molding space Vs and during subsequent steps of molding the hollow monolithic component.

[0030] In order to form the cavity of the single component, the machine M also includes at least one core disposed within the forming space Vs and including a membrane 3 that defines the receiving space Vc formed to form the cavity.

[0031] The shape of membrane 3 is therefore determined by the shape of the cavity of the monomer component to be obtained.

[0032] In the illustrated embodiment, the membrane 3 is substantially parallelepiped in shape with rounded edges to obtain a hollow monolithic component with a cavity having a rounded rectangular cross-section.

[0033] In other embodiments not shown, membrane 3 may have any shape.

[0034] Preferably, the membrane 3 is made of a material selected from the following: liquid silicone rubber; latex rubber; PTE / PE for rotational molding; low-melting-point polymer for rotational molding; low-melting-point polymer for thermoforming; thermoplastic polymer for blow molding; and thermoplastic polymer for injection molding.

[0035] Advantageously, these materials allow the membrane 3 to be molded into the desired shape to take up the cavity of the monomer component.

[0036] Advantageously, these materials also enable the membrane 3 to resist the high pressure and high temperature (preferably greater than 150°) generated during the molding process, but at the same time allow it to be easily removed from the hollow monomer component at the end of the molding process.

[0037] In practice, during the molding process, the membrane 3 defining the cavity must not lose its shape (especially due to compression) or collapse, as this would result in a part with incorrect cavity size or shape at the end of the molding process, or, if the membrane 3 collapses, the part will have no cavity at all. In this regard, the containment space Vc defined by the membrane 3 is filled with a filler R such as oil or particulate material, which will be described in more detail below.

[0038] For filling purposes, the core also includes a connector 4, preferably but not limited to a threaded connector, that engages with the membrane 3. Preferably, the connector 4 is hollow and at least partially covered by the membrane 3 on its exterior. Figure 3A This prevents the filler R from leaking out of the containment space Vc and altering the composition of the material C when the containment space Vc is filled.

[0039] In other words, the core is formed in the form of an irregularly shaped bag, which can be filled with filler R through at least one connector 4 to resist molding pressure in order to form a cavity within the monolithic component.

[0040] As shown in the accompanying drawings, the machine M further includes an oil circuit 2 configured to move the movable half of the first half-mold 1a and the second half-mold 1b, and a vacuum circuit 5 preferably formed in a fixed half-mold within the first half-mold 1a and the second half-mold 1b, configured to generate negative pressure in the molding space Vs and aid in the diffusion of a stream of material C during the molding process. In another feasible embodiment, the vacuum circuit 5 may be formed in the movable half-mold within the first half-mold 1a and the second half-mold 1b. Alternatively, the vacuum circuit 5 may be formed in both the first half-mold 1a and the second half-mold 1b.

[0041] Therefore, in order to implement a molding method for manufacturing a monolithic component having at least one cavity inside, particularly a monolithic component made of C-SMC, the aforementioned mold is prepared. In this step, the mold is prepared such that the first half-mold 1a, the second half-mold 1b, and the side brackets, when present, move away from each other so that the aforementioned core can be placed within the molding space Vs.

[0042] Next, a strand of material C, particularly a strand of C-SMC, is wrapped around the core such that the core is at least partially immersed in the strand of material C. More specifically, the strand of material C may wrap around the membrane 3, thereby substantially completely covering the membrane 3 or only covering a portion thereof.

[0043] As shown in the attached figure, at least one connector 4 protrudes at least partially from a strand of material C, such that the core can be fixed within one of the first half-mold 1a and the second half-mold 1b, particularly within a fixed half-mold.

[0044] In other words, in the step of wrapping a strand of material C around the core, the core is covered by the strand of material C to be formed, such that at least one connector 4 is at least partially free of a strand of material C and such that the core thus wrapped can be fixed within a fixed half mold.

[0045] Once the core has been fixed to the fixed half-mold in the first half-mold 1a and the second half-mold 1b, the receiving space Vc of the membrane 3 is filled with a predetermined amount of filler R through the connector 4.

[0046] refer to Figure 1 In the embodiment shown, the containment space Vc is filled with particulate material selected from the following materials: sand; salt; glass microspheres; honeycomb pellets.

[0047] According to the present invention, in Figure 2 and 3In the embodiment shown, the filler R is oil from the oil circuit 2 of the mold.

[0048] More specifically, in these embodiments, during the step of fixing the core in the fixed half-mold within the first half-mold 1a and the second half-mold 1b, at least one connector 4 is fixed to the half-mold near the delivery portion 2a of the oil circuit 2. This allows the receiving space Vc to be in fluid communication with the delivery portion 2a of the oil circuit 2 during its filling, enabling a predetermined amount of oil to flow from the oil circuit 2 into the receiving space Vc. Therefore, in this case, when it is necessary to fill the receiving space Vc, a portion of the oil from the oil circuit 2 of the mold flows into the receiving space Vc through the connector 4.

[0049] After the step of filling the receiving space Vc of the filling film 3, the method includes the steps of closing the first half mold 1a, the second half mold 1b and closing the side bracket when present, such that a strand of material C and the core are located between the first half mold 1a and the second half mold 1b and are thus received in the molding space Vs.

[0050] After closing the first half mold 1a and the second half mold 1b, the method further includes raising the temperature of a strand of material C so that the strand of material C can move within the molding space Vs and flow along the membrane 3 of the core, and be evenly distributed throughout the molding space Vs.

[0051] The flow rate percentage of a material in the forming space Vs can be high (high flow rate) or low (low flow rate), with a maximum of 99%. This flow rate percentage varies depending on the required mechanical and morphological characteristics of the finished part (e.g., thickness, size, extraction axis). In other words, once the temperature has been raised, a stream of material C can flow in the forming space Vs to cover the entire membrane 3 and disperse throughout the forming space Vs.

[0052] In the step of wrapping a material C onto the membrane 3, where the material C is substantially completely wrapped onto the membrane 3 (e.g., 99% of the surface of the membrane 3), the amount of material C flowing in the forming space is less than in the case where the material C is wrapped onto the membrane 3 to cover only a portion of the membrane 3.

[0053] In a preferred embodiment, the membrane 3 has a smooth, polished surface on the outside of the containing space Vc, which allows a stream of material C to flow and spread easily, and allows for the creation of cavities without defects or unevenness on the surface.

[0054] Advantageously, despite the presence of cavities, the membrane 3 produced in this way allows for the production of parts with good dimensional tolerances and high mechanical strength.

[0055] After the steps of filling the accommodating space Vc and closing the first half mold 1a, the second half mold 1b (and side brackets if present), the method includes the step of applying molding pressure to a strand of material C to form a monolithic component.

[0056] Preferably, the molding pressure applied to a strand of material C is between 8 bar and 300 bar, and more preferably, the molding pressure is 120 bar.

[0057] If the filler R is oil from the oil circuit 2 of the mold, the molding pressure is applied to a strand of material C by causing the membrane 3 to expand.

[0058] More specifically, after closing the first half-mold 1a, the second half-mold 1b, and, if necessary, the movable side bracket, additional oil is filled into the receiving space Vc of the membrane 3 through the conveying section 2a to cause the membrane 3 to expand. This expansion applies a thrust to a strand of material C, thereby compressing it between the membrane 3 and the first half-mold 1a and the second half-mold 1b. In this case, a strand of material C is thus shaped by the pressure exerted by the oil contained in the receiving space Vc, pushing the membrane 3 from the inside out.

[0059] On the other hand, if the filler R is a particulate material, the step of applying molding pressure is achieved by moving one of the first half-mold 1a and the second half-mold 1b toward the other while holding the membrane 3 in a fixed configuration. In this case, the first half-mold 1a pushes against the second half-mold 1b, thereby applying pressure to a strand of material C located between them, while there is no active action on the membrane 3, neither compression nor expansion. The movable half-mold in the first half-mold 1a and the second half-mold 1b is thus pressed against the fixed half-mold, thereby pressing a strand of material C onto the membrane 3, however, the membrane 3 does not lose its shape (especially due to compression) because of the presence of the filler R previously filled into the receiving space Vc. If the first half-mold 1a and the second half-mold 1b are provided with side brackets, these side brackets move together with the first half-mold 1a and the second half-mold 1b, thereby compressing a strand of material C to form the desired undercut in the hollow monomer component.

[0060] In other words, the filler R present in the containment space Vc of the membrane 3 can support the molding pressure applied to a strand of material C by the first half mold 1a, the second half mold 1b (and side brackets if present), so that the membrane 3 does not collapse or lose its shape (especially due to compression) and prevents the proper formation of the monomer components.

[0061] In another feasible embodiment, the first half mold 1a, the second half mold 1b and the membrane 3 can work simultaneously, such that molding pressure is simultaneously applied to a strand of material C from the inside to the outside due to the filler R and from the outside to the inside due to the movement of the first half mold 1a and the second half mold 1b toward each other.

[0062] In a preferred embodiment, the first mold half 1a and the second mold half 1b include compression chambers to ensure that the correct molding pressure is applied to a strand of material C. The compression chambers are configured to act as restraining stops for the first mold half 1a and the second mold half 1b during the closing movement, but without losing the overall molding pressure applied to the strand of material C.

[0063] More specifically, when the membrane 3 is filled with particulate material, a strand of C-SMC is formed by applying molding pressure to a strand of material C via the first half-mold 1a and the second half-mold 1b. To maintain proper molding pressure by forming restrictive stops for the movement of the first half-mold 1a and the second half-mold 1b, the first half-mold 1a and the second half-mold 1b are provided with vertical compression chambers. When molding pressure is applied via the first half-mold 1a and the second half-mold 1b, a portion of the resin contained in the strand of C-SMC is forced out of the molding space Vs and into the compression chamber. In this case, the resin acts as a restrictive stop for the first half-mold 1a and the second half-mold 1b and simultaneously prevents the loss of a portion of the molding pressure applied to the strand of material C.

[0064] Conversely, when molding pressure is applied by expanding the membrane 3, the first half-mold 1a and the second half-mold 1b are provided with horizontal compression chambers.

[0065] Once molding pressure has been applied to a strand of material C to form a hollow monolithic component, the method includes the step of emptying the filler R from the receiving space Vc.

[0066] More specifically, when the filler R is particulate... Figure 1 In the embodiment shown, the accommodating space Vc is emptied by the same connector 4 used to fill the accommodating space with filler R.

[0067] The packing material R used is a predetermined amount of oil from oil circuit 2. Figure 2 In the illustrated embodiment, the emptying step of the containment space Vc is achieved by fluidly connecting the containment space with the return portion 2b of the oil circuit 2, allowing a predetermined amount of oil to flow from the containment space Vc back into the oil circuit 2. For example... Figure 2As shown, the conveying portion 2a and the return portion 2b are formed within fixed half-molds in the first half-mold 1a and the second half-mold 1b, such that once the core has been fixed inside the first half-mold 1a and the second half-mold 1b, the corresponding connector 4 can be fluidly connected to portions 2a and 2b to allow oil to flow in and out of the receiving space Vc.

[0068] In other words, in this embodiment, the containment space Vc is connected to the delivery portion 2a and the return portion 2b of the oil circuit 2 via the corresponding connector 4, thereby forming an open circuit for oil to flow into and out of the containment space Vc during the steps of filling and emptying the containment space Vc, respectively.

[0069] Figure 3 The implementation methods shown are the same as Figure 2 The difference in the illustrated embodiment is that the delivery portion 2a and the return portion 2b of the oil circuit 2 are the same part. In other words, in this embodiment, the same portions 2a and 2b of the oil circuit 2 of the mold are fluidly connected to the receiving space Vc to form a closed loop that allows oil to flow into the receiving space Vc during the steps of emptying the receiving space Vc and during the steps of flowing into and out of the receiving space Vc.

[0070] After the step of emptying the filler R from the receiving space Vc, the method includes the step of removing the core from the molded monomer component.

[0071] To facilitate this step following the emptying of the containment space Vc, the method includes activating a vacuum circuit 5 formed on at least one of the first half-mold 1a and the second half-mold 1b and connected to the molding space Vs to generate a negative pressure that separates the membrane 3 from the inner surface of the molded monomer component.

[0072] In this case, when the step of emptying the containment space Vc is completed and before the first half mold 1a, the second half mold 1b and the side brackets in existence move away from each other to open the mold, the vacuum circuit 5 is activated to separate the membrane 3 from the wall of the cavity.

[0073] In other words, before the first half-mold 1a and the second half-mold 1b are opened, the vacuum circuit 5 generates a suction force that separates the membrane 3 from the inner wall of the hollow monomer component.

[0074] Advantageously, this step allows the core to be easily and conveniently removed from the cavity of the monolithic component, avoiding the risk that the membrane 3 of the core remains stuck in the cavity and impairs the component properties.

[0075] After activating the vacuum circuit 5 and opening the first half-mold 1a and the second half-mold 1b, the method includes the step of effectively removing the core. This step includes the sub-step of separating at least one connector 4 from the fixed half-molds in the first half-mold 1a and the second half-mold 1b and removing the molded monolithic component together with the connector 4 from the mold.

[0076] In the embodiment shown in the accompanying drawings, connector 4 is a threaded connector that is screwed onto the fixed half-mold in the first half-mold 1a and the second half-mold 1b during the step of fixing the core and unscrewed from it during the separation step described above.

[0077] Alternatively, connector 4 is connected to the fixed half-mold and thus to the oil circuit by inserting connector 4 into a suitably shaped socket formed in the fixed half-mold.

[0078] Once the molded monomer part has been removed from the mold, the connector 4 is removed from the part and the membrane 3 is at least partially removed through the opening left on the molded monomer part by the connector 4.

[0079] When the membrane 3 is removed through the opening left on the molded monomer component by the connector 4, a portion of the membrane 3 may remain in the cavity. In order to remove these portions of the membrane 3 from the cavity as well, the core removal step may include a sub-step of forming at least one opening in the monomer component to allow complete or partial removal of the membrane 3.

[0080] Advantageously, the possibility of extracting the membrane 3 through the opening left by the connector 4 or through a specially formed opening avoids molding the part into a section that requires subsequent connection, and instead allows for the direct molding of a single component.

[0081] Once at least one opening has been formed in the hollow monomer component, the step of removing the core also includes a sub-step of raising the temperature of the hollow monomer component.

[0082] In this sub-step, the entire component is placed in an oven that can raise the temperature of the component before it is removed through the opening of membrane 3. In this case, membrane 3 is softened, making it easy to remove from the component through the newly formed opening or the opening left by connector 4.

[0083] The method then includes a step of trimming the area of ​​the molded monolithic component near the opening left by at least one connector 4.

[0084] like Figure 3AAs shown, during the molding step, a portion of material C is deposited around the tip of the core at the junction of connector 4 and membrane 3. In this case, when the molding pressure step ends, the resulting monomer part has a "burr" near connector 4. This "burr" is removed when connector 4 and membrane 3 are removed to give the monomer part its originally desired shape.

[0085] Preferably, in this step of the method, if present, "burrs" formed on the hollow monomer component near the compression chamber are also removed.

[0086] Preferably, the "burrs" are removed by milling and / or piercing.

[0087] This invention achieves its intended objective by eliminating the shortcomings of existing technologies.

[0088] More specifically, the present invention provides a method for molding hollow monolithic components and producing complex components with very good mechanical properties.

[0089] This method can also produce BiW parts that meet current market standards.

[0090] Furthermore, this method is cheaper than existing technologies and allows for competitive production speeds that meet market productivity requirements.

[0091] Advantageously, membrane 3 allows for the easy and reliable formation of cavities of the desired shape within the monomer component.

Claims

1. A molding method for manufacturing a monolithic part having at least one internal cavity and made of C-SMC, comprising the following steps: Prepare a mold comprising a first half-mold (1a) and a second half-mold (1b), one of the first half-mold (1a) and the second half-mold (1b) being movable via an oil circuit (2), and the other of the first half-mold (1a) and the second half-mold (1b) being fixed, the first half-mold (1a) and the second half-mold (1b) defining a molding space (Vs) therebetween, the mold also comprising a movable side bracket cooperating with the first half-mold (1a) and the second half-mold (1b) to define the molding space (Vs); At least one core is placed within the molding space (Vs), wherein the core includes a membrane (3) defining a receiving space (Vc) formed to form at least one cavity of the monolithic component and at least one connector (4) engaged with the membrane (3) and configured to allow filling of the receiving space (Vc). Wrap a strand of material (C) to be formed around the core so that the core is at least partially immersed in the strand of material (C); The core is fixed within one of the first half-mold (1a) and the second half-mold (1b); The receiving space (Vc) of the membrane (3) is filled with filler (R) through the connector (4); After closing the first half mold (1a) and the second half mold (1b), molding pressure is applied to the strand of material (C) to form the single component, and After these steps: Empty the accommodating space (Vc) of the packing (R); After opening the first half mold (1a) and the second half mold (1b), the core is removed from the molded single component. The feature is that, in the step of filling the containment space (Vc) of the membrane (3), the containment space (Vc) is placed in fluid communication with the delivery portion (2a) of the oil circuit (2) to allow a supply flow that causes a predetermined amount of oil to flow from the oil circuit (2) to the containment space (Vc), and / or in the step of emptying the containment space (Vc), the containment space is placed in fluid communication with the return portion (2b) of the oil circuit (2) to allow a return flow that causes a predetermined amount of oil to flow from the containment space back to the oil circuit (2).

2. The method according to claim 1, wherein, The conveying section (2a) and the return section (2b) of the oil circuit (2) are the same part.

3. The method according to claim 1 or 2, wherein, The step of applying molding pressure includes a sub-step of delivering an additional amount of oil into the containment space (Vc) of the membrane (3) to cause the membrane (3) to expand, thereby applying the molding pressure to the strand of material (C).

4. The method according to claim 1 or 2, wherein, Between the step of wrapping the strand of material (C) around the core and the step of applying molding pressure, there is a step of raising the temperature of the strand of material (C).

5. The method according to claim 1 or 2, wherein, In the step of fixing the core within one of the first half-mold (1a) and the second half-mold (1b), the at least one connector (4) engages with the fixed one of the first half-mold (1a) and the second half-mold (1b), thereby allowing the formation of a flow of the filler (R) during the steps of filling and emptying the membrane (3).

6. The method according to claim 5, wherein, After the steps of emptying the accommodating space (Vc) and opening the first half-mold (1a) and the second half-mold (1b), the method includes the following steps: Separate the at least one connector (4) from the fixed half-mold in the first half-mold (1a) and the second half-mold (1b); The molded single component is removed from the mold along with the at least one connector (4).

7. The method according to claim 1 or 2, wherein, The step of removing the core includes the following sub-steps: Remove at least one connector (4) from the molded single component; The membrane (3) is at least partially removed from the opening left by the at least one connector (4) on the molded monolithic component.

8. The method according to claim 7, wherein, After the core removal step, the step is to trim the area of ​​the molded monolithic component near the opening left by the at least one connector (4).

9. The method according to claim 1 or 2, wherein, The step of removing the core from the molded monolithic component includes the following sub-steps: At least one opening is formed on the monomer component, the at least one opening being configured to allow complete or partial release of the membrane (3). Increase the temperature of the molded monomer component to soften the film (3).

10. The method according to claim 1 or 2, wherein, Prior to the step of opening the first half mold (1a) and the second half mold (1b), there is a step of driving a vacuum circuit (5) formed on at least one of the first half mold (1a) and the second half mold (1b) and communicating with the molding space (Vs) to generate a negative pressure action for separating the membrane (3) from the inner surface of the molded monolithic component.

11. The method according to claim 1, wherein, The step of fixing the core in one of the first half mold (1a) and the second half mold (1b) includes fixing the core in a fixed half mold of the first half mold (1a) and the second half mold (1b).

12. A machine (M) for molding hollow monolithic parts made of C-SMC, said machine being configured to implement the method according to claim 1 or 2 and comprising: A mold comprising a first half-mold (1a) and a second half-mold (1b), one of the first half-mold (1a) and the second half-mold (1b) being movable and the other of the first half-mold (1a) and the second half-mold (1b) being fixed, the first half-mold (1a) and the second half-mold (1b) defining a molding space (Vs) therebetween, the mold further comprising a movable side bracket cooperating with the first half-mold (1a) and the second half-mold (1b) to define the molding space (Vs); At least one core is placed within the molding space (Vs) and includes a membrane (3) defining a receiving space (Vc) that is shaped to form the at least one cavity of the monolithic component. The core also includes at least one connector (4) that engages with the membrane (3) and is configured to allow filling of the receiving space (Vc). Oil circuit (2), which is configured to move the movable one of the first half mold (1a) and the second half mold (1b); A vacuum circuit (5) is configured to generate negative pressure in the forming space (Vs).

13. The machine (M) according to claim 12, wherein, The membrane (3) is made of liquid silicone rubber or latex rubber.

14. The machine (M) according to claim 12, wherein, The membrane (3) is made of PTE / PE for rotational molding.

15. The machine (M) according to claim 12, wherein, The membrane (3) is made of a low-melting-point polymer used for rotational molding.

16. The machine (M) according to claim 12, wherein, The membrane (3) is made of a low-melting-point polymer used for thermoforming.

17. The machine (M) according to claim 12, wherein, The membrane (3) is made of a thermoplastic polymer used for blow molding.

18. The machine (M) according to claim 12, wherein, The membrane (3) is made of a thermoplastic polymer used for injection molding.

19. The machine (M) according to any one of claims 12 to 18, wherein, The oil circuit (2) includes a conveying portion (2a) and a return portion (2b) disposed in fixed half molds in the first half mold (1a) and the second half mold (1b), the conveying portion (2a) and the return portion (2b) being in fluid communication with corresponding connectors (4) to allow oil to flow from the oil circuit (2) to the receiving space (Vc) and from the receiving space (Vc) to the oil circuit (2), respectively.

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