1. A carbon fiber composite material beam forming die is characterized by comprising a core die (1), a plurality of core blocks (2) and an outer die (3); wherein the content of the first and second substances,

the core mold (1) is matched with a reinforcing rib (5) of the carbon fiber composite beam;

the outer surface of the core mold (1) forms a paving surface of the reinforcing rib (5);

the core blocks (2) are arranged on the outer side of the core mould (1);

the core block (2) is matched with a gap (6) in the carbon fiber composite material beam;

a plurality of core blocks (2) and the core mold (1) are spliced to form a paving surface of the outer frame (4);

the outer die (3) is arranged on the outer side of the core block (2).

2. The carbon fiber composite material beam forming die as claimed in claim 1, wherein the outer die (3) comprises an upper die (31) and a lower die (32) which are spliced with each other.

3. The carbon fiber composite beam forming mold according to claim 2, wherein the core mold (1) has an octagonal structure.

4. The carbon fiber composite beam-forming die of claim 3, wherein the core block (2) has a triangular structure.

5. The carbon fiber composite material beam-forming die as claimed in claim 4, wherein the number of the core blocks (2) is four.

6. The carbon fiber composite material beam forming die as claimed in claim 5, wherein the cross section of the inner wall of the outer die (3) is rectangular or square.

7. The carbon fiber composite beam forming die according to any one of claims 1 to 6, wherein the core block (2) is made of silicon rubber.

8. The carbon fiber composite beam forming die as claimed in any one of claims 1 to 6, wherein the core die (1) and the outer die (3) are made of stainless steel.

9. A forming method of a carbon fiber composite beam is characterized in that the forming is carried out through a carbon fiber composite beam forming die according to any one of claims 1 to 8; the forming method of the carbon fiber composite beam comprises the following steps:

s1: paving a prepreg paving layer of a reinforcing rib (5) on a core mold (1) to obtain a first assembly body;

s2: placing a plurality of core blocks (2) on the outer side of the first assembly body to obtain a second assembly body;

s3: paving a prepreg paving layer of an outer frame (4) on the outer side of the second assembly body to obtain a third assembly body;

s4: placing an outer die (3) on the outer side of the third assembly body to obtain a fourth assembly body;

s5: taking out the core mold (1) in the fourth assembly, placing a first vacuum bag in the fourth assembly, sleeving a second vacuum bag outside the fourth assembly, and connecting the end parts of the first vacuum bag and the second vacuum bag to obtain a fifth assembly;

s6: and after the fifth assembly body is subjected to hot-pressing curing, taking out the workpiece to obtain the carbon fiber composite beam.

10. The method for molding a carbon fiber composite girder according to claim 9, wherein the step S1 includes:

s11: paving and sticking demolding cloth on the core mold (1);

s12: sequentially paving and sticking an air felt, an isolation film, a vacuum bag and a PTEE film on the demolding cloth to obtain a pretreated core mold (1);

s13: and paving a prepreg paving layer of the reinforcing ribs (5) on the pretreated core mold (1) to obtain the first assembly body.

Background

Based on the characteristics of high specific strength, high specific modulus and good fatigue resistance of the carbon fiber composite material, the carbon fiber composite material is widely applied to various fields such as aerospace, rail transit and the like, and is gradually developed from being only used for secondary load-bearing members to being used for main load-bearing members.

The beam structure is a main bearing part with various structures, and in order to achieve the purpose of improving the structural efficiency, the beam structure is required to reduce the quality of a finished piece as much as possible under the condition of ensuring the stress, so that the carbon fiber composite beam structure can be widely developed.

For the beam outer frame with the closed polygonal structure, and the carbon fiber composite beam with the plurality of reinforcing rib structures is arranged in the beam outer frame, the manufacturing difficulty of the carbon fiber composite beam with the structure is large due to the fact that the beam is complex in structure and has an internal structure and an external structure; in the prior art, an internal reinforcing rib structure and an external beam outer frame structure are formed separately, and then the beam outer frame and the reinforcing rib are connected through a fastener or structural adhesive.

The carbon fiber composite material beam manufactured by the manufacturing method has poor integrity, so that the mechanical property of the carbon fiber composite material beam is poor, and the application of the carbon fiber composite material beam is limited to a certain extent.

Disclosure of Invention

The invention solves the problem that the mechanical property of the carbon fiber composite material beam is poor.

In order to solve the problems, the invention provides a carbon fiber composite material beam forming die which comprises a core die, a plurality of core blocks and an outer die; wherein the content of the first and second substances,

the core mold is matched with the reinforcing ribs of the carbon fiber composite beam;

the outer wall of the core mold forms a paving surface of the reinforcing rib;

the core blocks are arranged on the outer side of the core mold;

the core block is matched with a gap in the carbon fiber composite beam;

the core blocks and the core mould are spliced to form a paving surface of the outer frame;

the outer die is arranged on the outer side of the core block.

Optionally, the outer mold comprises an upper mold and a lower mold which are spliced with each other.

Optionally, the mandrel is of an octagonal configuration.

Optionally, the core block is of a triangular structure.

Optionally, the number of the core blocks is four.

Optionally, the cross section of the inner wall of the outer die is rectangular or square.

Optionally, the core block is made of silicon rubber.

Optionally, the core mold and the outer mold are both made of stainless steel.

Another object of the present invention is to provide a method for forming a carbon fiber composite beam, wherein the carbon fiber composite beam is formed by the carbon fiber composite beam forming mold; the forming method of the carbon fiber composite beam comprises the following steps:

s1: paving a prepreg paving layer with reinforcing ribs on the core mold to obtain a first assembly body;

s2: placing a plurality of core blocks on the outer side of the first assembly body to obtain a second assembly body;

s3: paving a prepreg paving layer of an outer frame on the outer side of the second assembly body to obtain a third assembly body;

s4: placing an outer die on the outer side of the third assembly body to obtain a fourth assembly body;

s5: taking out the core mold in the fourth assembly, placing a first vacuum bag in the fourth assembly, sleeving a second vacuum bag outside the fourth assembly, and connecting the end parts of the first vacuum bag and the second vacuum bag to obtain a fifth assembly;

s6: and after the fifth assembly body is subjected to hot-pressing curing, taking out the workpiece to obtain the carbon fiber composite beam.

Optionally, step S1 includes:

s11: paving demolding cloth on the core mold;

s12: sequentially paving and sticking an air felt, an isolation film, a vacuum bag and a PTEE film on the demolding cloth to obtain a pretreated core mold;

s13: and paving a prepreg paving layer of the reinforcing ribs on the pretreated core mold to obtain the first assembly body.

Compared with the prior art, the carbon fiber composite beam forming die provided by the invention has the following advantages:

according to the carbon fiber composite beam forming die provided by the invention, the core die, the core block and the outer die are matched, so that the formed carbon fiber composite beam is of an integrated structure, a secondary bonding process in the traditional carbon fiber composite beam production process is avoided, the forming process is simplified, the integrity of the carbon fiber composite beam structure is improved, the advantages of the carbon fiber composite are brought into full play, and the mechanical property of the carbon fiber composite beam is improved.

Drawings

FIG. 1 is a schematic view of a carbon fiber composite beam according to the present invention;

FIG. 2 is a schematic structural diagram of a carbon fiber composite beam forming mold according to the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of a first assembly according to the present invention;

FIG. 5 is a schematic view of a second assembly according to the present invention;

FIG. 6 is a schematic view of a third assembly according to the present invention;

fig. 7 is a schematic view of a fourth assembly according to the present invention.

Description of reference numerals:

1-core mould; 2-core block; 3-external mold; 31-upper die; 32-lower die; 4-outer frame; 5-reinforcing ribs; 6-gap.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," "radial," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of simplifying the description, and are not intended to indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present invention.

Furthermore, the terms "first" and "second" are used merely to simplify the description and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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 invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the first feature being "on" or "under" the first feature may comprise the first feature being in direct contact with the second feature or the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Because the outer frame is of a closed polygonal structure, and the carbon fiber composite beam with a plurality of reinforcing ribs is arranged in the outer frame, as shown in fig. 1, in order to ensure the mechanical property of the carbon fiber composite beam and achieve the purpose of reducing weight, a plurality of reinforcing ribs 5 are arranged in the outer frame 4, both ends of each reinforcing rib 5 are connected with the inner wall of the outer frame 4, and a gap 6 is arranged between each reinforcing rib 5 and the outer frame 4, so that the structure of the carbon fiber composite frame is complex, and the manufacturing difficulty is high; the traditional carbon fiber composite material forming method is adopted, only the inner reinforcing ribs 5 and the outer frame 4 can be formed separately, and then the formed reinforcing ribs 5 are connected with the outer frame 4; because the reinforcing ribs 5 and the outer frame 4 are manufactured by a separate molding method, the manufactured carbon fiber composite material beam has poor integrity, and thus poor mechanical properties.

In order to solve the problem that the mechanical property of the existing carbon fiber composite beam, particularly the carbon fiber composite beam with a closed polygonal outer frame and a reinforcing rib arranged inside the beam is poor, the invention provides a carbon fiber composite beam forming die, which is shown in figures 2 and 3 and comprises a core die 1, a plurality of core blocks 2 and an outer die 3; the core mold 1 is matched with a reinforcing rib 5 of the carbon fiber composite beam and used for laying and adhering prepreg of the reinforcing rib 5; the concrete structure of the core mold 1 is determined according to the structure of the reinforcing rib 5, and specifically, the outer wall of the core mold 1 forms a paving surface of the reinforcing rib 5; the core blocks 2 are arranged on the outer side of the core mould 1; the core block 2 is matched with the gap 6 in the carbon fiber composite beam, namely the core block 2 is filled at the position corresponding to the gap 6 to form the gap 6 in the carbon fiber composite beam; a plurality of core blocks 2 and the core mould 1 are spliced to form a paving surface of an outer frame 4; the outer die 3 is arranged on the outer side of the core block 2, so that female die curing is performed through the outer die 3, and the precision of the outer molded surface of the carbon fiber composite beam is guaranteed.

When the carbon fiber composite material forming mold provided by the application is used for forming, firstly, a male mold is adopted for paving and pasting prepreg on the outer wall of the core mold 1, as shown in fig. 4, a prepreg paving layer of a reinforcing rib 5 is obtained on the outer wall of the core mold 1, and the prepreg paving layer of the reinforcing rib 5 and the core mold 1 together form a first assembly body; placing core blocks 2 at the corresponding positions of the outer sides of the first assembly bodies and the gaps 6 in the carbon fiber composite beams, and as shown in fig. 5, splicing a plurality of core blocks 2 with the first assembly bodies to form second assembly bodies, wherein the second assembly bodies are paving dies of the outer frame 4, and the outer walls of the second assembly bodies are paving faces of the outer frame 4; continuing to use the outer wall of the second assembly body as a paving surface, and adopting a method of paving a positive surface to pave and paste prepreg on the outer side of the second assembly body, as shown in fig. 6, obtaining prepreg paving layers of an outer frame 4 on the outer wall of the second assembly body, wherein the prepreg paving layers of the outer frame 4 and the second assembly body form a third assembly body together; it can be seen from figure 6 that in the third assembly body, the prepreg that two times were laid spreads the position interconnect between two adjacent core blocks 2 to in the solidification forming process in later stage, the prepreg that two times were laid spreads the layer and can become the integral type structure, and then makes the carbon-fibre composite roof beam formula structure as an organic whole that this application prepared.

Referring to fig. 7, after the outer frame 4 is completely laid, the outer mold 3 is placed on the outer side of the third assembly body, so as to obtain a fourth assembly body; and carrying out corresponding hot-pressing curing and other treatments on the fourth assembly body to obtain the integrally formed carbon fiber composite material beam.

According to the carbon fiber composite beam forming die provided by the invention, the core die 1, the core block 2 and the outer die 3 are matched, so that the formed carbon fiber composite beam is of an integrated structure, a secondary bonding process in the traditional carbon fiber composite beam production process is avoided, the forming process is simplified, the integrity of the carbon fiber composite beam structure is improved, the advantages of carbon fiber composite materials are brought into full play, and the mechanical property of the carbon fiber composite beam is improved.

The application provides a forming die of carbon-fibre composite roof beam, cooperation through mandrel 1 and a plurality of pellet 2, the realization is spread respectively reinforcing rib 5 and frame 4 and is pasted to in the shop, thereby at the shop paste in-process, can confirm corresponding shop's layer angle equipartition layer parameter according to the atress condition of reinforcing rib 5 and frame 4 respectively, the reasonable design of spreading the layer that spreads, help the anisotropic characteristics of full play carbon-fibre composite, on the basis of guaranteeing mechanical properties, the quality of greatly reduced carbon-fibre composite roof beam.

Through the carbon-fibre composite roof beam forming die that this application provided, in the forming process, adopt the formpiston to spread and paste, then move to the bed die and carry out assembly body solidification, compare with the forming method of traditional carbon-fibre composite roof beam, can guarantee the quality in carbon-fibre composite roof beam turning region and the overall structure size of finished piece, can guarantee the roughness of profile and outer profile in the carbon-fibre composite roof beam simultaneously, and can guarantee the inside technology quality of carbon-fibre composite roof beam, can also overcome the inhomogeneous shortcoming of carbon-fibre composite roof beam wall thickness.

In order to reduce the molding difficulty, the outer mold 3 preferably includes an upper mold 31 and a lower mold 32 that are spliced together, so that in the molding process, after the upper mold 31 and the lower mold 32 are respectively placed on the outer side of the third assembly body, the upper mold 31 and the lower mold 32 are closed to obtain a fourth assembly body.

The concrete structure of the core die 1 in the application is determined according to the structure of the reinforcing ribs 5 in the carbon fiber composite beam, and as the prepreg paving layers of the reinforcing ribs 5 are paved in a male die paving mode, the shape of the core die 1 can be in any regular or irregular geometric shape, so that the carbon fiber composite beam forming die can be suitable for forming beams with various different structural forms, and the application range of the carbon fiber composite beam forming die is favorably expanded; it is preferable in the present application that the core mold 1 has an octagonal structure, that is, the sectional shape of the core mold 1 is an octagon.

The structure of the core block 2 is determined according to the gap 6 in the carbon fiber composite beam, namely according to the structures of the reinforcing ribs 5 and the outer frame 4, correspondingly, the core block 2 is preferably of a triangular structure, namely the section of the core block 2 is of the triangular structure, and the number of the core blocks 2 is four; the section of the inner wall of the outer die 3 is in the length direction or square.

The preferable material of the core block 2 is silicon rubber; preferably, the core mold 1 and the outer mold 3 are made of stainless steel.

The core mould 1 can be in a solid structure or a hollow structure, and the core mould 1 is in a hollow structure; in addition, the core mold 1 can be an integral structure or a split structure formed by splicing two or more parts, and can be specifically determined according to the size of the carbon fiber composite beam; in order to reduce the molding difficulty, the core mold 1 is preferably a split structure including a first core mold and a second core mold, and the core mold 1 is obtained by combining the first core mold and the second core mold in the molding process.

Another object of the present invention is to provide a method for molding a carbon fiber composite beam, which is performed by the carbon fiber composite beam molding die as described above; the forming method of the carbon fiber composite beam comprises the following steps:

s1: paving a prepreg paving layer with reinforcing ribs 5 on the core mold 1 to obtain a first assembly body;

s2: placing a plurality of core blocks 2 on the outer side of the first assembly body to obtain a second assembly body;

s3: paving a prepreg paving layer of the outer frame 4 on the outer side of the second assembly body to obtain a third assembly body;

s4: placing the outer die 3 on the outer side of the third assembly body to obtain a fourth assembly body;

s5: taking out the core mold 1 in the fourth assembly, placing a first vacuum bag in the fourth assembly, sleeving a second vacuum bag outside the fourth assembly, and connecting the end parts of the first vacuum bag and the second vacuum bag to obtain a fifth assembly;

s6: and after the fifth assembly body is subjected to hot-pressing curing, taking out the workpiece to obtain the carbon fiber composite beam.

The parameters such as the ply angle of the prepreg ply of the reinforcing rib 5 are determined according to the stress characteristics of the reinforcing rib 5, the parameters such as the ply angle of the prepreg ply of the outer frame 4 are determined according to the stress characteristics of the outer frame 4, so that the anisotropic characteristic of the carbon fiber composite material is fully exerted, and the weight is reduced to the greatest extent on the basis of ensuring the mechanical property.

According to the forming method of the carbon fiber composite beam, the core mold 1, the core block 2 and the outer mold 3 are matched, so that the formed carbon fiber composite beam is of an integrated structure, a secondary gluing process in the production process of the traditional carbon fiber composite beam is avoided, the forming process is simplified, the integrity of the carbon fiber composite beam structure is improved, the advantages of the carbon fiber composite are brought into full play, and the mechanical property of the carbon fiber composite beam is improved.

Specifically, step S1 includes:

s11: paving demolding cloth on the core mold 1;

s12: sequentially paving and sticking an air felt, an isolation film, a vacuum bag and a PTEE film on the demolding cloth to obtain a pretreated core mold 1;

s13: and paving a prepreg paving layer of the reinforcing ribs 5 on the pretreated core mold 1 to obtain a first assembly body.

In the process of paving and pasting the prepreg paving layer of the reinforcing rib 5, paving and pasting at each paving angle are included, the whole body is paved and pasted in a butt joint mode, splicing seams are staggered in the paving and pasting process, and preferably, every two layers of the butt joints are staggered by at least 25mm in the application until the paving and pasting of the prepreg paving layer are finished; in order to ensure the size precision of the workpiece during final curing, the first layer, the fourth layer and the last four layers are spliced in an overlapping mode, and other layers are paved in a butt joint mode.

In step S5, after the core mold 1 is taken out, further finishing the auxiliary material on the part, placing a first vacuum bag inside a fourth assembly body, that is, inside the prepreg laying layer of the reinforcing ribs 5, then placing an air felt on the surface of the upper mold 31 for protection, and attaching a sealing adhesive tape to the edge of the first vacuum bag; and wrapping a second vacuum bag outside the fourth assembly, namely arranging a vacuum bag inside and outside the fourth assembly respectively, and then connecting the end parts of the first vacuum bag and the second vacuum bag with each other to obtain the fifth assembly.

In the preferred step S6, the autoclave curing process is performed, specifically, the fifth assembly is moved into an autoclave, parameters of the hot-press curing are determined according to the properties of the carbon fiber material, mechanical requirements, and the like, and then the hot-press curing is performed according to a set program; and after the hot-pressing curing is finished, carrying out operations such as demoulding according to a set program, and taking out the workpiece to obtain the carbon fiber composite beam.

The application provides a forming method of carbon-fibre composite roof beam, the process is simple, and can realize the integrated shaping of the carbon-fibre composite roof beam of multiple complex construction, when reducing the shaping degree of difficulty, still helps improving the shaping quality, improves the mechanical properties of carbon-fibre composite roof beam, further enlarges the application scope of carbon-fibre composite roof beam.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.