CN114347509A - Composite material part forming method, composite material part and forming die - Google Patents
Composite material part forming method, composite material part and forming die Download PDFInfo
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- CN114347509A CN114347509A CN202210004494.5A CN202210004494A CN114347509A CN 114347509 A CN114347509 A CN 114347509A CN 202210004494 A CN202210004494 A CN 202210004494A CN 114347509 A CN114347509 A CN 114347509A
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Abstract
The application relates to a composite part forming method, a composite part and a forming die. The method comprises the following steps: paving and sticking a prepreg along the outer surface of a core mold of a forming mold to form a preformed body, wherein the core mold is a rigid core mold, and the preformed body has a cavity structure following the contour of the outer surface of the core mold; placing the core mold with the preformed body in a cavity of a forming mold, and enabling the peripheral surface of the preformed body to be attached to the cavity surface of the cavity; removing the core mold from the preform; and packaging the preformed body through a vacuum bag, and curing and molding the packaged preformed body through an autoclave process. The scheme provided by the application can improve the size precision of the preformed body, and further improves the quality of the molded part.
Description
Technical Field
The application relates to the technical field of part forming processes, in particular to a forming method of a composite material part, the composite material part and a forming die.
Background
The aerospace field has higher and higher requirements on structure weight reduction, structure lightweight and structure integration, carbon fibers have excellent performances such as light weight, high specific strength, high specific modulus, designability and the like, the carbon fiber composite material has more and more extensive application in the aerospace field due to the performance advantages of the carbon fiber composite material and the rapid development of the composite material forming process technology, and the occupation ratio of advanced composite material parts on an aircraft becomes a key evaluation standard of the technical advanced degree and market competitiveness of the aircraft.
In the related art, in the process of molding a composite material part with a cavity structure, a core mold is generally made of a material such as foam and silicone rubber, and the material such as foam and silicone rubber has insufficient rigidity and strength, so that the problem of wrinkling and material clamping of a preform is easily caused in the process of mold closing, and the precision of the outline dimension of the preform is poor.
Disclosure of Invention
In order to solve or partially solve the problems in the related art, the application provides a composite part forming method, a composite part and a forming mold, which can improve the dimensional precision of a preformed body and further improve the quality of the formed part.
The application provides in a first aspect a method of forming a composite part, comprising:
paving and sticking a prepreg along the outer surface of a core mold of a forming mold to form a preformed body, wherein the core mold is a rigid core mold, and the preformed body has a cavity structure following the contour of the outer surface of the core mold;
placing the core mold with the preformed body in a cavity of a forming mold, and enabling the peripheral surface of the preformed body to be attached to the cavity surface of the cavity;
removing the core mold from the preform;
and packaging the preformed body through a vacuum bag, and curing and molding the packaged preformed body through an autoclave process.
In one embodiment, the laying up prepreg along an outer surface of a core mold of a forming mold comprises:
and paving and pasting the prepreg in multiple layers along the outer surface of a core mold of the forming mold, and performing pre-compaction, wherein the prepreg of adjacent layers is bonded through an adhesive.
In one embodiment, prior to laying down the prepreg along the outer surface of the core of the forming die, the method comprises:
and paving demolding cloth on the outer surface of the core mold of the forming mold.
In one embodiment, the forming die comprises an upper die and a lower die, and the cavity is defined by the upper die and the lower die together;
the step of placing the core mold with the preform into a cavity of a forming mold comprises the following steps:
and embedding the core mold with the preform into a lower mold cavity of the forming mold, and then closing the upper mold and the lower mold, wherein a mold closing gap between the upper mold and the lower mold is smaller than a preset size.
In one embodiment, the removing the mandrel from the preform comprises:
and extracting the core mold from the preformed body along the extending direction of the cavity structure of the preformed body.
In one embodiment, the mandrel has a Brinell hardness of 30 to 150.
In one embodiment, the material of the core mold comprises a wood substitute material.
A second aspect of the present application provides a composite part produced by the method of forming a composite part as described above in relation to the first aspect.
A third aspect of the present application provides a forming mold, including an upper mold, a lower mold, and at least one set of core mold;
the upper die and the lower die jointly define at least one cavity in which the core die can be embedded, and the preformed body can be arranged between the peripheral surface of the core die and the cavity surface of the cavity, wherein the core die is a rigid core die.
The technical scheme provided by the application can comprise the following beneficial effects:
according to the method for molding the composite material part, the prepreg is paved along the outer surface of a core mold of a molding mold to form a preform, wherein the core mold is a rigid core mold, and the preform has a cavity structure following the contour of the outer surface of the core mold; placing the core mold with the preformed body in a cavity of a forming mold, and enabling the peripheral surface of the preformed body to be attached to the cavity surface of the cavity; removing the core mold from the preform; and packaging the preformed body, and curing and molding the packaged preformed body through an autoclave process. By the treatment process, the prepreg is effectively guaranteed to be tightly paved and adhered on the core mold, deformation of the preformed body is avoided, the outline dimension precision of the preformed body is improved, and the quality of the molded part is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application, as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
FIG. 1 is a schematic flow chart of a method for forming a composite part according to an embodiment of the present disclosure;
FIG. 2 is another schematic flow chart diagram illustrating a method of forming a composite part according to an embodiment of the present disclosure;
fig. 3 is a schematic mold clamping diagram of a molding die according to an embodiment of the present application;
fig. 4 is a schematic drawing of the core mold of the molding die according to the embodiment of the present application.
Reference numerals: a molding die 100; a lower die 110; an upper die 120; a core mold 130; a lower mold cavity 111; and an upper mold cavity 121.
Detailed Description
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the related art, in the process of molding a composite material part with a cavity structure, a core mold is generally made of a material such as foam and silicone rubber, and the material such as foam and silicone rubber has insufficient rigidity and strength, so that the problem of wrinkling and material clamping of a preform is easily caused in the process of mold closing, and the precision of the outline dimension of the preform is poor.
In view of the above problems, embodiments of the present application provide a method for molding a composite material part, and a molding die, which can improve the dimensional accuracy of a preform, thereby improving the quality of the molded part.
The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a molding method of a composite material part according to an embodiment of the present application.
Referring to fig. 1, a composite part molding method of the present application includes:
and S110, paving the prepreg along the outer surface of the core mold of the forming mold to form a preformed body, wherein the core mold 130 is a rigid core mold, and the preformed body has a cavity structure following the contour of the outer surface of the core mold.
The prepreg is a continuous fiber or fabric impregnated with a resin matrix under strictly controlled conditions, and the prepreg of this embodiment may be a carbon fiber prepreg.
In this embodiment, because the core mold 130 is a rigid core mold, the core mold 130 has better strength and hardness, and therefore the core mold 130 does not deform along with the compaction of the prepreg, so that the prepreg is easier to be laid and attached, and in the compaction process, the gas doped in the laying layer can be more completely discharged, so that the degree of compactness of the laying and attaching of the prepreg and the core mold 130 is improved, and further the overall dimension precision of the preform is improved.
And S120, placing the core mold with the preformed body in the cavity of the forming mold, and enabling the outer peripheral surface of the preformed body to be attached to the cavity surface of the cavity.
In this step, when the preform is placed in the cavity of the molding die, the preform is positioned between the outer peripheral wall of the core mold 130 and the cavity surface of the cavity of the molding die, and since the core mold 130 is a rigid core mold, the core mold 130 can press the preform against the cavity surface, and the outer dimension of the preform can be controlled more accurately.
In this step, an external force may be applied to the core mold 130 to insert the core mold 130 into the cavity, and since the core mold 130 is made of a rigid material, the core mold 130 has a better supporting function on the preform, and the outer surface of the preform can be more closely attached to the inner wall of the cavity, thereby realizing more effective control of the shape and dimensional accuracy of the preform.
And S130, extracting the core mold from the preform.
In this step, since the core mold 130 is a rigid core mold, the core mold 130 is easily extracted, and the fracture phenomenon does not occur at the time of extraction.
And S140, packaging the preformed body through a vacuum bag, and curing and molding the packaged preformed body through an autoclave process.
In the step, the preformed body can be packaged through the vacuum bag, and the vacuum bag used for packaging needs to penetrate through the cavity of the preformed body due to the fact that the preformed body has a cavity structure, so that the vacuum bag which accords with the size of the part can be manufactured in advance, and packaging operation is facilitated.
In this embodiment, can be through autoclave technology to the preforming body solidification after the encapsulation, because the preforming body has more accurate overall dimension, can not produce deformation, consequently, guaranteed combined material in the ascending continuity of load direction, can promote the structural strength of the part after the solidification has guaranteed the part quality.
In summary, in the method for molding a composite material part of the present application, a prepreg is applied along an outer surface of a core mold of a molding die to form a preform, wherein the core mold is a rigid core mold; placing a core mold with a preformed body in a cavity of a forming mold, and attaching the peripheral surface of the preformed body to the cavity surface of the cavity; taking the core mold out of the preformed body; and packaging the preformed body through a vacuum bag, and curing and molding the packaged preformed body through an autoclave process. By the aid of the treatment process, the prepreg is effectively guaranteed to be tightly paved and adhered on the core mold, deformation of the preformed body is avoided, size precision of the preformed body is improved, and quality of the molded part is improved.
Fig. 2 is another schematic flow chart of a part molding method of a composite material according to another embodiment of the present application, and fig. 2 describes the method according to the embodiment of the present application in more detail than fig. 1.
Referring to fig. 2, a method of forming a part of the composite material of the present application includes:
and S210, sticking demolding cloth on the outer surface of the core mold of the forming mold.
In this step, a release fabric is attached to the outer surface of the core mold 130 to prevent adhesion between the core mold 130 and the prepreg, so that the core mold 130 can be more easily extracted.
And S220, paving and pasting the prepregs in multiple layers along the outer surface of the core mold of the forming mold, and performing pre-compaction to form a preformed body, wherein the prepregs of adjacent layers are bonded through an adhesive.
In the step, the prepreg can be layered and paved according to the pre-designed paving angle, paving quantity and paving method, the prepregs of adjacent layers are bonded through the adhesive, the adhesive can be a resin material, but the bonding is not limited to the resin material, and the preformed body formed after paving and paving forms a certain thickness, so that the strength of the preformed body is further improved.
In some embodiments, when the preform has a cylindrical or elongated configuration with a cavity, the prepreg may be applied to the mandrel 130 by winding multiple layers.
In this embodiment, since the core mold 130 is a rigid core mold, a proper external force can be applied to pre-compact the prepreg during the laying process of the prepreg, and during the pre-compaction, wrinkles are not easily generated between layers of the prepreg, so that the layer-by-layer laying and compaction of the prepreg is ensured, and the bonding between layers of the prepreg is tighter, so that the strength and the dimensional accuracy of the preform formed after the laying are further improved.
And S230, embedding the core mold with the preformed body into a lower mold cavity of a forming mold, and then closing the upper mold and the lower mold, wherein a mold closing gap with a preset size is formed between the upper mold and the lower mold.
Referring to fig. 3 and 4, in the present embodiment, the forming mold 100 includes an upper mold 120 and a lower mold 110, and the cavity is defined by the upper mold 120 and the lower mold 110, wherein the cavity of the forming mold 100 includes an upper mold cavity 121 disposed on the upper mold 120 and a lower mold cavity 111 disposed on the lower mold 110, and after mold closing, the upper side of the core mold 130 can be inserted into the upper mold cavity 121, and the lower side of the core mold 130 can be inserted into the lower mold cavity 111.
In this step, first, the lower side of the core mold 130 with a preform is fitted into the lower mold cavity 111, and after the upper mold 120 is closed, the upper side of the core mold 130 can be fitted into the upper mold cavity 121. In the mold closing process, the core mold 130 and the lower mold cavity 111 may be aligned, and then the position of the core mold 130 may be adjusted by applying an external force to the core mold 130 so that the lower side of the core mold 130 is fitted into the lower mold cavity 111.
In this embodiment, since the core mold 130 is a rigid core mold and the prepreg is more densely spread on the outer surface of the core mold 130, when the preform is fitted into the lower mold cavity 111 with the support of the core mold 130, the prepreg is not deformed or wrinkled when subjected to the pressing force of the core mold 130 and the lower mold 110, and further, since the support force of the core mold 130 is stronger, it is possible to prevent the preform in the related art from being difficult to completely fit the cavity, and the portion where the preform is difficult to fit (for example, the R-angle) can be more closely fit to the portion corresponding to the cavity surface.
In this embodiment, after the lower side of the core mold 130 is fitted into the lower mold cavity 111, the upper outer surface of the preform can be kept flat at all times, that is, the area of the upper outer surface of the preform is not increased by being pressed when the preform is fitted into the lower mold 110, and the surface area of the upper side of the preform is made substantially equal to the area of the cavity surface of the upper mold cavity 121, so that the preform is not wrinkled or pinched in the mold clamping gap by the pressure of the upper mold 120 when the mold is clamped. After the mold is closed, the mold closing gap between the upper mold 120 and the lower mold 110 can be smaller than 2mm, compared with the related art, the mold closing gap is smaller, the dimensional precision of the preform can be further improved, and the core mold can be more easily extracted in the subsequent step.
And S240, extracting the core mold from the preform.
In this embodiment, the composite material part is a part with a cavity structure, wherein the cavity structure is formed with regular taper. In this step, the core mold 130 can be extracted from the preform in the direction opposite to the direction in which the taper of the cavity structure is formed, and when the core mold is extracted, the outer surface of the core mold 130 is separated from the tapered surface of the cavity structure, whereby the frictional force at the time of extraction can be reduced, and the influence on the preform structure size at the time of extraction of the core mold can be reduced.
Because the prepreg is laid and attached, the outer surface of the core mold is laid and attached with a layer of demoulding cloth, when the core mold is extracted, the outer surface of the core mold and the preformed body are not sticky, and after the core mold is extracted, the demoulding cloth can be remained on the inner surface of the preformed body, so that the extraction process of the core mold is smoother, and the preformed body cannot be distorted and deformed.
In this embodiment, the layers of the prepreg are bonded to each other by an adhesive, and after the pre-compaction and vacuumization, the layers of the prepreg are tightly bonded to each other to have a predetermined thickness, so that the structural strength of the preform is increased, and the dimensional accuracy of the preform can be maintained even when the preform is not supported when the core mold is extracted.
Since the core mold is a rigid core mold and has higher strength, the phenomenon that the core mold made of silicon rubber is easily broken when being extracted in the related art can be avoided.
And S250, packaging the preformed body through a vacuum bag.
In the step, the pre-forming body can be packaged through the vacuum bag, and the pre-forming body has a cavity structure, so that the vacuum bag used for packaging needs to penetrate through the cavity of the pre-forming body, and the vacuum bag which meets the size of the part can be configured in advance, thereby facilitating the packaging operation.
In one embodiment, the preform may be encapsulated by passing the preform through a "wrap" type encapsulation, i.e., a vacuum bag is passed through the internal cavity of the part, the inner surface of the vacuum bag being in contact with the atmosphere.
In one embodiment, when the preform is in a long strip shape, for example, the forming body is a main rib structure or a secondary rib structure of the spread-out antenna, and the cross-sectional dimension of the cavity structure is small, a vacuum bag which is prepared in advance and is matched with the size of the preform can be guided through the internal cavity of the preform through a guide, for example, the guide can be a metal wire, a head end of the metal wire firstly penetrates through the internal cavity of the preform, then one end of the vacuum bag is fixed to a tail end of the metal wire, and when the metal wire is pulled out from the other side of the internal cavity, the metal wire can guide the vacuum bag into the internal cavity.
And S260, curing and molding the packaged pre-formed body through an autoclave process.
In the step, the preformed body can be cured and molded through an autoclave process, and the preformed body has more accurate overall dimension, so that the continuity of the composite material in the bearing direction is ensured, the structural strength of the cured and molded part can be further improved, and the quality of the part is ensured.
In the related art, in the process of forming a composite material part with a cavity structure, a core mold is generally made of foam, silicon rubber and the like, and the core mold made of the foam has the following defects: after the part is solidified and molded, the foam filled in the part as a core mold is not easy to take out, so the foam can be kept in the core mold, the foam in the part can slowly shrink and fall off after aging along with the passage of time, and when equipment or a product moves, the fallen foam can impact the inside of the part under the action of inertia to cause abnormal sound. The core mould made of silicon rubber has the following defects: the service life of the silicon rubber is short, the number of times of use is generally not more than ten, and the part is scrapped when the part is broken in the extraction process after the part is formed; in addition, when the prepreg is laid, a release agent is smeared on the surface of the silicon rubber, so that residual release agent is adsorbed on the inner surface of the part, and the molding quality of the part is affected.
In this embodiment, the Brinell hardness of the core mold is 30-150, or the hardness of the core mold may be greater than that of the foam material and the silicone rubber material, and compared with the core mold made of the foam material and the silicone rubber material in the related art, the core mold has better rigidity and strength. The defect that the core mold in the related art is difficult to extract in the preformed body due to the adoption of foam can be avoided, the phenomenon that the core mold in the related art made of silicon rubber is easy to break when the core mold is extracted can be avoided, and in addition, the release agent does not need to be coated on the outer surface of the core mold, so the release agent is not left on parts.
In one embodiment, the core mold can be made of wood substitute material, which is a polymer material, such as epoxy wood, polyurethane wood, polyester wood, phenolic resin wood, etc., and has high hardness, low thermal expansion coefficient, dimensional stability, low cost, and easy processing.
The above introduces a molding method of a composite material part according to an embodiment of the present application, and accordingly, the present application further provides a molding die and a corresponding embodiment.
Fig. 3 is a schematic mold closing diagram of a molding die according to an embodiment of the present application, and fig. 4 is a schematic core mold extraction diagram of the molding die according to the embodiment of the present application.
Referring to fig. 3 and 4, the present application provides a forming mold 100 including an upper mold 120, a lower mold 110, and at least one set of core molds 130; the upper mold 120 and the lower mold 110 together define at least one cavity into which a core mold can be inserted, and a preform can be disposed between the outer circumferential surface of the core mold and the cavity surface of the cavity, wherein the core mold 130 is a rigid core mold.
In this embodiment, the brinell hardness of the core mold is 30-150, or the hardness of the core mold 130 may be greater than that of the foam material and the silicone rubber material, so that after the design, in the process of laying and attaching the prepreg, the tightness of laying and attaching the prepreg on the core mold is effectively ensured, the deformation of the preform in the process of laying and attaching the preform is avoided, the overall dimension precision of the preform is improved, in addition, in the process of die assembly, the phenomena that the preform generates wrinkles and clamping materials are generated on the die assembly surface can be avoided, and the structural strength and the part quality of the molded part are further improved.
In some embodiments, a plurality of core molds 130 may be configured, so as to ensure that when one or more sets of core molds 130 are occupied during the use of the forming mold 100, another set or more sets of spare core molds 130 may perform the laying work of the prepreg, so that the cyclic curing forming of the preform may be realized, and the production efficiency of the composite material part and the utilization rate of the forming mold may be improved.
Referring to fig. 3 and 4, in some embodiments, the cavity of the molding die is defined by the upper die 120 and the lower die 110, and includes an upper die cavity 121 formed in the upper die 120 and a lower die cavity 111 formed in the lower die 110, and after the dies are closed, the upper side of the core die 130 can be inserted into the upper die cavity 121, and the lower side of the core die 130 can be inserted into the lower die cavity 111.
In some embodiments, the lower side of the core mold 130 with the preform is first inserted into the lower mold cavity 111 and then the upper mold 120 is closed such that the upper side of the core mold 130 is inserted into the upper mold cavity 121. For example, after the core mold 130 and the lower mold cavity 111 are aligned, an external force is applied to the core mold 130 to adjust the position of the core mold 130 so that the lower side of the core mold 130 is accurately fitted into the lower mold cavity 111, and then the upper mold 120 is fitted to the lower mold 110.
In this embodiment, since the core mold 130 is a rigid core mold, the prepreg spread on the outer surface of the core mold 130 is more compact, the core mold 130 has a better supporting effect on the preform, and when the lower side of the core mold 130 with the preform is embedded in the lower mold cavity 111, the preform is not easily deformed, and the preformed outer surface and the cavity surface are more closely attached, so that the dimensional accuracy of the preform is improved, and the quality of the molded part is improved.
The composite material part forming method and the forming die are introduced, and accordingly the application also provides the composite material part with the cavity structure, and the composite material part is manufactured by the composite material part forming method.
The composite material part provided by the embodiment has a cavity structure following the contour of the outer surface of the core mold, and the cavity structure is formed with regular taper, so that the core mold can be smoothly extracted in the forming process. In some embodiments, the composite material part may be applied to a large-sized deployable antenna, for example, may be used as a main rib and/or a sub-rib structure of the large-sized deployable antenna, but is not limited thereto, so that not only the requirement of light weight of the large-sized deployable antenna may be satisfied, but also the main rib and the sub-rib structure have higher structural strength, and thus the working stability and the service life of the deployable antenna may be improved.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A method of forming a composite part, comprising:
paving and sticking a prepreg along the outer surface of a core mold of a forming mold to form a preformed body, wherein the core mold is a rigid core mold, and the preformed body has a cavity structure following the contour of the outer surface of the core mold;
placing the core mold with the preformed body in a cavity of a forming mold, and enabling the peripheral surface of the preformed body to be attached to the cavity surface of the cavity;
removing the core mold from the preform;
and packaging the preformed body through a vacuum bag, and curing and molding the packaged preformed body through an autoclave process.
2. The method of forming a composite part of claim 1, wherein the step of applying a prepreg along an outer surface of a core mold of a forming mold comprises:
and paving and pasting the prepreg in multiple layers along the outer surface of a core mold of the forming mold, and performing pre-compaction, wherein the prepreg of adjacent layers is bonded through an adhesive.
3. The method of forming a composite part of claim 1, wherein prior to applying the prepreg along the outer surface of the core of the forming tool, the method comprises:
and paving demolding cloth on the outer surface of the core mold of the forming mold.
4. The method of forming a composite part of claim 1, wherein:
the forming die comprises an upper die and a lower die, and the cavity is defined by the upper die and the lower die together;
the step of placing the core mold with the preform into a cavity of a forming mold comprises the following steps:
and embedding the core mold with the preform into a lower mold cavity of the forming mold, and then closing the upper mold and the lower mold, wherein a mold closing gap between the upper mold and the lower mold is smaller than a preset size.
5. The method of molding a composite part according to claim 1, wherein the removing the core mold from the preform includes:
and extracting the core mold from the preformed body along the extending direction of the cavity structure of the preformed body.
6. The method of forming a composite part of claim 1, wherein:
the Brinell hardness of the mandrel is 30-150.
7. A method of forming a composite part according to any one of claims 1 to 6, wherein:
the core mold is made of a wood substitute material.
8. A composite part with a cavity structure, characterized in that:
the composite part is produced by a method of forming a composite part according to any one of claims 1 to 7.
9. A composite part with a cavity structure according to claim 8, characterized in that:
the composite material part is a main rib and/or a secondary rib structure of the spread antenna.
10. A molding die, comprising:
the upper die, the lower die and at least one set of core die;
the upper die and the lower die jointly define at least one cavity in which the core die can be embedded, and the preformed body can be arranged between the peripheral surface of the core die and the cavity surface of the cavity, wherein the core die is a rigid core die.
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