CN218985825U - High-strength carbon fiber composite material bottom plate and preparation mold thereof - Google Patents

Abstract

The utility model provides a high-strength carbon fiber composite material bottom plate and a preparation mold thereof, and belongs to the technical field of high-performance resin matrix composite materials. The composite material base plate formed by the die has the advantages of high base plate supporting strength and simple forming process, and is particularly suitable for the remote sensing satellite camera supporting structure. The base plate is a Chinese-character 'ri' shaped frame, the frame comprises composite material I-beam reinforcing ribs and skin, the skin is wrapped outside the composite material I-beam reinforcing ribs, and prepreg is laid for co-curing and integrally forming. The utility model designs a metal die-matching process, and the I-beam structure formed by the process not only bears the supporting function of the whole space camera, but also bears the weight reducing function of the whole structure.

Description

High-strength carbon fiber composite material bottom plate and preparation mold thereof

Technical Field

The utility model belongs to the technical field of high-performance resin matrix composite materials, and particularly relates to a high-strength carbon fiber composite material bottom plate and a preparation mold thereof.

Background

Along with the development of remote sensing technology and the progress of structure processing technology, the light-weight design technology research on the main support structure of the remote sensing camera becomes possible. The vibration load in the satellite transmitting stage can cause severe vibration, and the severe vibration can easily damage the internal structure of the space camera, so that the supporting structure of the remote sensing camera is particularly important to the reliability of the whole camera. An increase in the support stability of the spatial camera tends to mean an increase in the mass of the overall camera system.

The carbon fiber composite material has high specific modulus, high specific strength, high stability and smaller mass than the metal material under the condition of equal bearing capacity. The high-performance composite material bottom plate has the characteristics of complex structure, high requirement on shape and position precision, high difficulty in mold design and the like.

Disclosure of Invention

In view of the above, the utility model aims to provide a high-strength carbon fiber composite material base plate and a preparation mold thereof, so as to solve the problems of large quality, poor stability and no corresponding preparation mold of the prior satellite remote sensing camera support structure.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the high-strength carbon fiber composite material bottom plate is a Chinese-character 'ri' -shaped frame, the frame comprises composite material I-beam reinforcing ribs and a skin, the composite material I-beam reinforcing ribs are wrapped with the skin, and the composite material I-beam reinforcing ribs are laid by prepreg and co-cured into an integral molding;

the composite material I-beam reinforcing ribs comprise inverted C-shaped I-beam ribs and C-shaped I-beam ribs, and the inverted C-shaped I-beam ribs and the C-shaped I-beam ribs are arranged in a back-to-back mode.

Further, the thickness of each side of the I-beam reinforcing rib is 1mm-2mm.

The utility model provides a preparation high strength carbon fiber composite bottom plate's mould, includes pressurization board, split mould and the external pressure frame all around, split mould is located the inside of composite bottom plate, pressurization board all around is located the periphery of composite bottom plate, the external pressure frame is located the periphery of pressurization board all around.

Still further, the pressurization board all around includes right pressurization board, preceding pressurization board, goes up pressurization board, lower pressurization board, left pressurization board and back pressurization board, right pressurization board, preceding pressurization board, go up pressurization board, lower pressurization board, left pressurization board and back pressurization board enclose into the hexahedron.

Further, the split die comprises an inverse C-shaped split die and a C-shaped split die, wherein the inverse C-shaped split die is positioned inside the inverse C-shaped rib, and the C-shaped split die is positioned inside the C-shaped rib.

Further, the anti-C-shaped split die is stuck with the anti-C-shaped split die thermal expansion rubber, and the C-shaped split die is stuck with the C-shaped split die thermal expansion rubber.

Further, the thickness of the thermal expansion rubber of the reversed C-shaped split die is equal to that of the thermal expansion rubber of the C-shaped split die.

Furthermore, the thickness of the thermal expansion rubber of the reversed C-shaped split die and the thickness of the thermal expansion rubber of the C-shaped split die are both 1mm.

Compared with the prior art, the high-strength carbon fiber composite material bottom plate, the preparation method and the preparation mold have the beneficial effects that:

(1) In order to improve the overall stability of the space camera and reduce the overall quality of the space camera, the utility model designs the high-strength carbon fiber composite material bottom plate die, and the carbon fiber composite material bottom plate formed by using the die not only reduces the quality of the whole camera system, but also improves the overall stability of the camera system.

(2) The remote sensing camera bottom plate molded by the mold is used as a main supporting structure, has the characteristics of light weight, high strength, simple form, easy assembly and adjustment and the like, and is suitable for the coaxial space camera main supporting structure with high light weight degree.

(3) The composite material bottom plate forming die designed by the utility model adopts a serial combined die in the process of product development, adopts a scheme of integral forming and secondary curing in the forming process, solves the problems of design forming and demolding of a section die, and well ensures the technical problems of flatness, parallelism, relative positions of holes and the like of the bottom plate by various designed assembly tool dies.

(4) The utility model adopts the composite material to manufacture the composite material bottom plate, the molding process can realize short period, light weight and high strength compared with metal, and can realize batch production.

(5) The high-strength carbon fiber composite material bottom plate adopts the carbon fiber high-performance resin composite material, the I-beam structure of the high-strength carbon fiber composite material bottom plate is used for bearing load, and the I-shaped Liang Zhongkong structure effectively reduces the weight of the whole bottom plate structure.

(6) The utility model designs a metal die-matching process, and the I-beam structure formed by the process not only bears the supporting function of the whole space camera, but also bears the weight reducing function of the whole structure.

(7) The mold provided by the utility model meets the design requirement of the carbon fiber composite material bottom plate, is simple, easy to mold and easy to demold, can be used for multiple times, and can realize batch production of the carbon fiber composite material bottom plate.

(8) The utility model provides a fiber composite material bottom plate die, which solves the problems of large quality, poor stability, complex forming process and the like of a conventional satellite remote sensing camera supporting structure, and the bottom plate components are designed and manufactured integrally, and are formed integrally, so that the strength and rigidity of the whole structure are ensured, and the unpredictable weight is reduced. The I-beam and the skin are integrally formed, so that the integral rigidity is improved, and an interface is provided for subsequent assembly.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 is an isometric view of a carbon fiber composite floor according to the present utility model;

FIG. 2 is an enlarged cross-sectional view of a carbon fiber composite floor mold and a floor according to the present utility model;

FIG. 3 is a left side view of a carbon fiber composite mat according to the present utility model;

FIG. 4 is a right side view of a carbon fiber composite baseboard according to the present utility model;

FIG. 5 is a top view of a carbon fiber composite substrate according to the present utility model;

FIG. 6 is a bottom view of a carbon fiber composite substrate according to the present utility model;

FIG. 7 is a front view of a carbon fiber composite mat according to the present utility model;

FIG. 8 is a rear view of a carbon fiber composite floor according to the present utility model;

FIG. 9 is an exploded view of a carbon fiber composite floor mold according to the present utility model;

in the figure: 1-I-beam reinforcing ribs; 2-covering; 3-right pressurizing plate; 4-a front pressurizing plate; 5-upper pressurizing plate; 6-pressing the plate downwards; 7-a composite material bottom plate; 8-split die; 9-externally pressing the frame; 10-left pressurizing plate; 11-a rear pressing plate; a-reverse C-shaped split die; b-C-shaped split die; c-inverse C-shaped split mold thermal expansion rubber; d-C-shaped split mold thermal expansion rubber; e-inverted C-shaped upper transverse edges of the ribs; f-reverse C-shaped rib vertical side; g-inverted C-shaped lower transverse edge of the tendon; h-C-shaped upper transverse edges of the ribs; i-C shaped rib vertical edge; the lower transverse edge of the j-C-shaped rib; the upper transverse edge of the k-inverse C-shaped rib and the upper transverse edge of the C-shaped rib are combined together to form a transition fillet naturally; the L-inverse C-shaped rib lower transverse edge and the C-shaped lower transverse edge are combined together to form a naturally formed transition fillet.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It should be noted that, in the case of no conflict, embodiments of the present utility model and features of the embodiments may be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

1. Referring to fig. 1-9, a high-strength carbon fiber composite material base plate is described, the base plate is a zigzag frame, the whole structure is divided into two parts, i-beam reinforcing ribs 1 and composite material base plate skin 2, the i-beam reinforcing ribs 1 are entirely wrapped by thin skin 2, the thin skin is formed by fiber prepreg paving and shaping, one-time curing is completed, a metal matched mould technology is designed, and a prepreg paving technology is matched, and a product is obtained through heating and curing.

The I-beam rib 1 is prepared and formed by adopting a split die molding process and a prepreg laying molding process; after all the split dies with the prepreg spread are assembled together, the skin 2 is integrally formed by the prepreg.

The preparation method of the high-strength carbon fiber composite material bottom plate specifically comprises the following steps:

A. preparing inverted C-shaped ribs and C-shaped ribs:

a1, as shown in FIG. 2, sticking a layer of 1mm thick thermal expansion rubber C of the anti-C-shaped split die on the anti-C-shaped split die a, and sticking a layer of 1mm thick thermal expansion rubber d of the C-shaped split die on the C-shaped split die b; the thickness of the thermal expansion rubber C of the reversed C-shaped split die is equal to that of the thermal expansion rubber d of the C-shaped split die.

And A2, paving a composite material carbon fiber prepreg on the reversed C-shaped split die a bonded with the thermal expansion rubber C according to design requirements, wherein the reversed C-shaped rib upper transverse edge e, the reversed C-shaped rib vertical edge f and the reversed C-shaped rib lower transverse edge g are integrally formed by adopting the composite material prepreg, and the fibers are continuous.

And A3, paving a composite material carbon fiber prepreg on the C-shaped split die b bonded with the thermal expansion rubber d according to the design requirement, wherein the upper transverse edge h of the C-shaped rib, the vertical edge i of the C-shaped rib and the lower transverse edge j of the C-shaped rib are integrally formed by adopting the composite material prepreg, and the fibers are continuous.

The macroscopic appearance of the step is that in the sixth drawing, the split mold 8 is paved with carbon fiber prepreg, and the split mold 8 comprises a C-shaped split mold a and an inverse C-shaped split mold b.

B. Combining the inverted C-shaped ribs and the C-shaped ribs:

b1, combining the inverted C-shaped rib and the C-shaped rib according to the mode shown in FIG. 2, wherein after the inverted C-shaped rib and the C-shaped rib are combined together, the upper transverse edge e of the inverted C-shaped rib and the upper transverse edge h of the C-shaped rib are in the same level; the vertical edge f of the inverted C-shaped rib is attached to the vertical edge i of the C-shaped rib; the inverted C-shaped lower transverse rib side g and the C-shaped lower transverse rib side j are positioned at the same level.

The macroscopic appearance of this step is that in fig. 6, two split dies 8 are combined together, after the prepreg is laid on the lower side in split in fig. 6, the inverted C-shaped ribs and the C-shaped ribs on the upper side are combined together, an i-beam structure is naturally formed, and then the integral skin is formed.

C. And vacuumizing, namely combining the inverted C-shaped ribs with the C-shaped ribs, and vacuumizing by adopting a vacuum bag method.

Preparing a metal flat plate, a vacuum bag, a sealing adhesive tape, a separation membrane, an airfelt and vacuumizing equipment;

c2, sticking a sealing adhesive tape on the metal flat plate, and placing a vacuum bag on the sealing adhesive tape for standby;

the C3 is formed by integrally wrapping the combined inverted C-shaped rib split die and the combined C-shaped rib split die by using a separation film and an airfelt;

and C4, placing the whole inverted C-shaped rib split die and the C-shaped rib split die in a vacuum bag for vacuumizing, and after the pressure in the vacuum bag reaches a required value, maintaining for a period of time, discharging the pressure in the vacuum bag, and assembling all split dies for paving the carbon fiber composite material bottom plate skin.

D. Paving a skin:

and C, paving the carbon fiber composite material bottom plate skin according to the designed paving layers, paving the skin layer by adopting continuous carbon fiber prepreg, and repeating the step C after all the carbon fiber prepreg skins are paved. So as to eliminate bubbles between the layers of prepregs during the prepreg lay-up process. Vacuumizing until all the surfaces of the prepregs are smooth and have no wrinkles.

E. And (3) die assembly of the bottom plate die:

and closing the metal outer die on the integrally formed carbon fiber composite material bottom plate according to the design requirement, wherein the die assembly sequence comprises a front pressurizing plate 4, a rear pressurizing plate 11, a left pressurizing plate 10, a right pressurizing plate 3, an upper pressurizing plate 5, a lower pressurizing plate 6 and an external pressurizing frame 9.

F. Curing the carbon fiber composite substrate:

and (3) solidifying the carbon fiber composite material bottom plate according to a carbon fiber prepreg solidifying system, putting the whole mould into a solidifying furnace, preserving heat for a specified time under a given solidifying temperature condition, opening the solidifying furnace after the temperature in the solidifying furnace is naturally cooled to room temperature, and demoulding the product.

G. Demolding:

and the demoulding sequence is opposite to the mould closing sequence, and the outer pressurizing frame 9, the lower pressurizing plate 6, the upper pressurizing plate 5, the right pressurizing plate 3, the left pressurizing plate 10, the rear pressurizing plate 11 and the front pressurizing plate 4 are sequentially demoulded, and finally the two split moulds 8 are removed, so that the designed carbon fiber composite bottom plate is obtained.

The specific process flow is as follows: mould processing, layering male mould forming, prepreg layering, mould closing and curing, demoulding and trimming, machining an opening, and checking and delivering.

The prepreg is composed of high modulus carbon fiber and high performance epoxy resin. Epoxy value of epoxy resin in the prepreg is more than or equal to 0.85, volatile content is less than or equal to 2%, gel time (105 ℃) is (40+/-5) min, and tensile modulus is more than or equal to 330GPa.

Preparation of the prepreg:

the preparation of the prepreg generally uses a hot melting method, a reinforcing material subjected to heat treatment or chemical treatment is impregnated with resin glue solution through a glue dipping tank, the resin content of the prepreg is controlled through a glue scraping device and a traction device, and the prepreg is prepared through baking for a certain time at a certain temperature.

The prepreg is prepared by a hot melting method, the thickness of a single layer is 0.15mm, the volume content of carbon fiber is (58+/-2)%, and the mass per unit area is (300+/-5) g/m ² 。

The utility model adopts a prepreg system composed of high-performance carbon fiber and high-performance resin, and the system has higher mechanical property, heat resistance, dimensional stability, space outgassing performance, low moisture absorption and low dielectric property.

The utility model adopts the hot-melt prepreg manufacturing technology and the metal pair molding process to realize key process links such as easy layering, easy molding, easy demolding and the like.

A die molding process and a prepreg laying molding process:

the matched mold forming process is a process of firstly paving prepreg on a metal female mold or a metal male mold according to requirements, then closing the metal male mold or the metal female mold after paving, and completing solidification at a certain temperature and a certain pressure for a period of time. The composite material molding of the utility model needs to be carried out at a certain temperature and under a certain pressure, and the proper pressure can lead the resin to fully flow in the curing process, and simultaneously, the air bubbles in the resin are discharged to form a compact structure, so that the internal defects of air bubbles, layering and the like are reduced, the molding quality of the composite material product is ensured, and the pressurization in the curing molding process is extremely important. The specific parameters adopted by the utility model are that the curing is completed after 5 hours under 150 ℃ and-90 KPa to-80 KPa pressure.

The prepreg laying process is a composite material forming process in which prepregs composed of fibers and resin with certain thickness are laid according to a certain laying mode and a certain laying angle and are laid sequentially, and the process can exert the advantage of strong designability of the composite material and meet the requirements of forming of large-size and special-shaped structures. The utility model adopts the prepreg with the thickness of 0.15mm to design the product, and adopts the mode of circularly laying at the laying angles of 0 DEG, 90 DEG, 45 DEG or-45 DEG and the like.

The high-strength carbon fiber composite material base plate adopts a prepreg paving technology and a metal die-matching forming technology, the prepreg paving technology ensures the continuity of product fibers, and the metal die-matching technology ensures the appearance and dimensional accuracy of products.

The bottom plate prepared by the preparation method of the high-strength carbon fiber composite bottom plate is characterized in that: the base plate is a Chinese-character 'ri' shaped frame, the frame comprises composite material I-beam reinforcing ribs 1 and skin 2, the skin 2 is wrapped outside the composite material I-beam reinforcing ribs 1, and prepreg is laid and co-cured into a whole;

the composite material I-beam reinforcing rib 1 comprises an inverted C-shaped I-beam rib and a C-shaped I-beam rib, and the inverted C-shaped I-beam rib and the C-shaped I-beam rib are arranged in a back-to-back mode.

Compared with the traditional metal material remote sensing camera supporting bottom plate structure, the carbon fiber composite material supporting bottom plate structure has the advantages of light weight, high strength, high modulus and the like, and the carbon fiber composite material supporting bottom plate can realize high light weight while supporting the normal operation of a space remote sensing camera. At present, a carbon fiber composite material is adopted for researching a space remote sensing camera supporting structure bottom plate, compared with the existing carbon fiber composite material supporting structure bottom plate, the carbon fiber composite material reflector back plate structure is composed of a more stable inner hollow structure I-shaped beam structure, the inner hollow structure I-shaped beam structure is formed by combining an inverse C-shaped structure and a C-shaped structure, the inverse C-shaped structure and the C-shaped structure are combined together through a metal mold to form an I-shaped structure, and the I-shaped structure reduces the quality of the whole remote sensing camera system while ensuring large bearing and ensures high stability and high dimensional accuracy of the whole remote sensing camera system.

The thickness of each side (the upper transverse side and the lower transverse side) of the I-beam reinforcing rib 1 is controlled to be 1-2 mm, the structure is formed by high-performance composite material carbon fiber prepreg, the composite material carbon fiber prepreg has strong designability, the thickness of the I-beam structure can be flexibly controlled according to the load, for example, the bearing is small, and the thickness of each side of the I-beam structure can be controlled to be about 1 mm; if the bearing is large, the thickness of each side of the I-beam structure can be controlled to be about 2mm. The skin structure formed integrally with the skin structure needs to be formed in positive correlation with the thickness of the I-beam structure to meet the design requirements, and the size of the skin 2 can be designed according to the requirements.

Compared with a metal material, the composite material has the advantages of smaller density, high specific strength, high specific modulus and the like, so that the composite material and the metal material have smaller mass under the condition of the same bearing, and the composite material can obviously reduce the mass of the whole space system and has important effects of reducing the satellite emission cost and improving the stability of the whole remote sensing camera system when being used as a supporting structure of the remote sensing camera in the aerospace field. And the designability of the composite material is strong, so that the dimensional accuracy of the remote sensing camera can be improved by optimizing the forming mode of the carbon fiber prepreg while the design requirement is met.

The die of the high-strength carbon fiber composite material bottom plate comprises a peripheral pressing plate, a split die 8 and an external pressing frame 9, wherein the split die 8 is positioned inside the composite material bottom plate 7, the peripheral pressing plate is positioned at the periphery of the composite material bottom plate 7, and the external pressing frame 9 is positioned at the periphery of the peripheral pressing plate.

The four-side pressurizing plates comprise a right pressurizing plate 3, a front pressurizing plate 4, an upper pressurizing plate 5, a lower pressurizing plate 6, a left pressurizing plate 10 and a rear pressurizing plate 11, and the right pressurizing plate 3, the front pressurizing plate 4, the upper pressurizing plate 5, the lower pressurizing plate 6, the left pressurizing plate 10 and the rear pressurizing plate 11 are enclosed to form a hexahedron.

The split die 8 comprises an inverse C-shaped split die a and a C-shaped split die b, wherein the inverse C-shaped split die a is positioned in an inverse C-shaped rib, and the C-shaped split die b is positioned in the C-shaped rib.

The C-shaped split die b of the carbon fiber composite material bottom plate is adhered with the C-shaped split die thermal expansion rubber d.

The thickness of the thermal expansion rubber a of the reversed C-shaped split die is equal to that of the thermal expansion rubber d of the C-shaped split die.

The utility model creatively adopts a thermal expansion process of thermal expansion silicon rubber, processes the thermal expansion silicon rubber according to the size of a metal mold, and then adheres the thermal expansion silicon rubber to the metal mold. In the process of forming the composite material, a certain pressure is required to be given to the outside, the thermal expansion silicon rubber has the property of thermal expansion, in the process of curing the composite material, the metal mold is heated, so that the thermal expansion silicon rubber attached to the metal mold is heated to expand, and the size and the thickness of the thermal expansion silicon rubber are controlled, so that the proper pressure can be applied to the composite material. The method solves the problem of different expansion coefficients among materials.

After all split mold blocks are spliced, the integral skin 2 is paved. The bottom plate I-beam rib 1 is of a hollow double-C-shaped structure, the structure has excellent bearing capacity, the total quality of products can be fully lightened, the light weight design of the whole product can be fully ensured to be successfully completed, and the die has the advantages of easiness in implementation, easiness in demolding and the like.

The embodiments of the utility model disclosed above are intended only to help illustrate the utility model. The examples are not intended to be exhaustive or to limit the utility model to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model.

Claims (9)

1. The utility model provides a high strength carbon fiber composite material bottom plate which characterized in that: the bottom plate is a Chinese character 'ri' shaped frame, the frame comprises I-beam reinforcing ribs (1) and a skin (2), the skin (2) is wrapped outside the I-beam reinforcing ribs (1), and the I-beam reinforcing ribs are integrally formed;

the I-beam reinforcing rib (1) comprises an inverted C-shaped I-beam rib and a C-shaped I-beam rib, and the inverted C-shaped I-beam rib and the C-shaped I-beam rib are arranged back to back.

2. The high strength carbon fiber composite substrate of claim 1 wherein: the thickness of each side of the I-beam reinforcing rib (1) is 1mm-2mm.

3. A mold for preparing the high-strength carbon fiber composite material base plate according to claim 1, characterized in that: the novel plastic composite material pressing device comprises a peripheral pressing plate, a split die (8) and an external pressing frame (9), wherein the split die (8) is located inside a composite material bottom plate (7), the peripheral pressing plate is located at the periphery of the composite material bottom plate (7), and the external pressing frame (9) is located at the periphery of the peripheral pressing plate.

4. A mold for preparing a high-strength carbon fiber composite material mat according to claim 3, wherein: the four-side pressurizing plate comprises a right pressurizing plate (3), a front pressurizing plate (4), an upper pressurizing plate (5), a lower pressurizing plate (6), a left pressurizing plate (10) and a rear pressurizing plate (11), wherein the right pressurizing plate (3), the front pressurizing plate (4), the upper pressurizing plate (5), the lower pressurizing plate (6), the left pressurizing plate (10) and the rear pressurizing plate (11) are enclosed to form a hexahedron.

5. A mold for preparing a high-strength carbon fiber composite material mat according to claim 3, wherein: the split die (8) comprises a carbon fiber composite material bottom plate inverted C-shaped split die (a) and a carbon fiber composite material bottom plate C-shaped split die (b), wherein the carbon fiber composite material bottom plate inverted C-shaped split die (a) is positioned in the inverted C-shaped rib, and the carbon fiber composite material bottom plate C-shaped split die (b) is positioned in the C-shaped rib.

6. The mold for preparing a high-strength carbon fiber composite material mat according to claim 5, wherein: the C-shaped split die (b) of the carbon fiber composite material bottom plate is adhered with the C-shaped split die thermal expansion rubber (d).

7. The mold for preparing a high-strength carbon fiber composite material mat according to claim 6, wherein: the thickness of the thermal expansion rubber (C) of the reversed C-shaped split die is equal to that of the thermal expansion rubber (d) of the C-shaped split die.

8. The mold for preparing a high-strength carbon fiber composite material mat according to claim 7, wherein: the thicknesses of the thermal expansion rubber (C) of the reversed C-shaped split die and the thermal expansion rubber (d) of the C-shaped split die are 1mm.

9. A mold for preparing a high-strength carbon fiber composite material mat according to claim 3, wherein: the peripheral pressurizing plates, the split die (8) and the external pressurizing frame (9) are all made of metal materials.

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