Composite material foam sandwich mouth-shaped beam compression molding process method and mold structure

Abstract

The invention relates to a composite material foam sandwich mouth-shaped beam compression molding process method and a mold structure, and belongs to the technical field of composite material molding and manufacturing. A composite material foam sandwich mouth-shaped beam compression molding process method comprises the following steps that a layer of glue film is laid on the surface of a foam core, and a sealing system is adopted for sealing; the foam core pasted with the adhesive film and the sealing system are put into a drying oven, and curing is conducted according to the technological parameters of the adhesive film; laying mouth-shaped beam prepreg on the foam core with the cured adhesive film on the surface; putting the mold filled with the square beam semi-finished product blank on a pressing machine heating plate to be heated and pressurized until the mold is closed; paving the rest five layers of prepreg; putting the mouth-shaped beam blank which is paved with the prepreg into a mouth-shaped beam forming mold, closing the upper mold and the lower mold, and putting the mouth-shaped beam blank on a pressing machine heating plate; and after heating curing is completed, the temperature is reduced to 60 DEG C or below, and pressure relief and drawing are conducted. According to the invention, the problem that four surfaces of the mouth-shaped beam are pressed is solved; according to the process method, the lossless qualification rate and the surface quality of the square beam are effectively improved.

Description

TECHNICAL FIELD

[0001] The application relates to a composite material foam sandwich profiled beam mold pressing forming process method and a mold structure, and belongs to the technical field of composite material forming manufacturing. BACKGROUND

[0002] Composite material parts are widely used in the field of aerospace due to their high strength, high temperature resistance and fatigue resistance, and even account for 70% of some aircraft parts. At present, for small-sized parts, a variety of forming methods such as male die forming and silicone rubber forming can be used for forming; for large-sized profiled beams, water-soluble core molds or low-temperature melting core molds are usually used. The forming mold structure and process method of the conventional foam core profiled beam have the problem that the two side walls of the profiled beam are not well pressed, resulting in low surface quality of the foam core profiled beam. SUMMARY

[0003] The application aims to solve the problems in the prior art, and provides a composite material foam sandwich profiled beam mold pressing forming process method and a mold structure to improve the quality of parts and reduce production costs.

[0004] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme: a composite material foam sandwich profiled beam mold pressing forming process method, comprising the following steps, (1) a layer of adhesive film is laid on the surface of the foam core, and a sealing system is used for sealing, and vacuuming for more than 30 minutes; (2) the foam core with the adhesive film and the sealing system are put into an oven, and curing is performed according to the process parameters of the adhesive film; (3) the profiled beam prepreg is laid on the foam core with the cured adhesive film, and when the remaining 5 layers of prepreg are laid, the foam core with the profiled beam prepreg is put into a profiled beam forming mold, and the mold is closed; (4) the mold with the profiled beam semi-finished blank is placed on the heating plate of a press, heated and pressed to close the mold, and then kept warm and pressurized for 15 minutes, cooled to room temperature and taken out; (5) the remaining 5 layers of prepreg are laid; (6) the profiled beam blank with the laid prepreg is put into a profiled beam forming mold, and the mold is closed and placed on the heating plate of a press; the temperature is raised and cured according to the process parameters of the laid material; after the temperature is raised and cured, the temperature is lowered to below 60 DEG C, the pressure is released, and the mold is opened.

[0005] Preferably, in step (1), the sealing system is assembled from a sealing material, a breathable material, an isolation material and a vacuum bag.

[0006] Preferably, in step (2), the process parameters of the adhesive film are, The vacuum system has a vacuum degree of not less than 0.095 MPa, and is heated to (130±5) ℃ at a rate of not more than 3 ℃ / min, and is kept for 3-4 hours, and is cooled to below 60 ℃ at a rate of not more than 2 ℃ / min, and is unloaded, and the auxiliary material of the vacuum system is removed, and the foam core with the solidified glue film on the surface is taken out.

[0007] Preferably, in step (4), the mold with the mouth beam semi-finished product blank is placed on the heating plate of the press bed, and is heated, and is kept at (40±5) ℃ for 30 minutes, and is pressed to close the mold.

[0008] Preferably, in step (6), the heating plate of the press bed is heated to (80±5) ℃ at a rate of not more than 3 ℃ / min, and is kept for 30-40 minutes, and is pressed to 3-3.5 MPa.

[0009] Preferably, in step (6), the process parameters of the layer material are that, on the basis of the temperature of the heating plate of the press bed, the temperature is continuously increased to (125±5) ℃, and is kept for 1.5-2 hours.

[0010] Preferably, in step (6), under the pressure keeping condition, the cooling rate is decreased to below 60 ℃ at a rate of not more than 2 ℃ / min.

[0011] A composite material foam sandwich mouth beam forming mold structure, comprising an upper mold and a lower mold, used for the molding process method as described above, and the mold closing surface of the upper mold and the lower mold coincides with the diagonal surface of the composite material foam sandwich mouth beam.

[0012] Compared with the prior art, the present application has the following advantages: the problem of pressure on the four surfaces of the mouth beam is solved; and the process method effectively improves the loss-free qualified rate and the surface quality of the mouth beam. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a mold structure schematic diagram in the embodiment of the present application; Figure 2 is a cross-sectional view of a composite material foam sandwich mouth beam in the embodiment of the present application; Figure 1 in which, 1, an upper mold; 2, a lower mold; Figure 2 in which, 3, a foam core; 4, a glue film; 5, a prepreg. DETAILED DESCRIPTION

[0014] The following will be described in combination with the accompanying Figures 1-2Further details of the present application: a composite foam sandwich profile beam molding process, after the foam core 3 is hardened, the surface is laid with prepreg 5, when the remaining 5 layers of prepreg are laid, the foam core 3 and the lay-up are assembled into a vacuum bag sealing system with sealing material, vacuum pre-compaction for about 30 minutes, then the foam core 3 with part of the prepreg lay-up is put into the forming mold and the mold is closed, heated on the press, after heating is completed, it is cooled to room temperature and taken out, and the laying of the remaining prepreg is completed; the blank of the foam sandwich profile beam is placed in the profile beam forming mold, the upper mold 1 and the lower mold 2 are closed; the mold with the profile beam blank is placed on the heating plate of the press, and the heating and curing forming is carried out according to the curing parameters of the composite material.

[0015] The specific process method comprises the following steps: (1) A layer of adhesive film 4 is laid on the surface of the foam core 3, and a sealing system is assembled with sealing material, air permeable material, isolation material and vacuum bag, and vacuumed for more than 30 minutes; (2) The foam core 3 with adhesive film 4 and the sealing system are put into an oven, the vacuum degree of the vacuum system is not less than 0.095 MPa, the temperature is raised to (130±5)℃ at a rate of not more than 3℃ / min, the temperature is kept for 3-4 hours, the temperature is lowered to below 60℃ at a rate of not more than 2℃ / min, the vacuum is removed, the auxiliary materials constituting the vacuum system are removed, and the foam core 3 with the surface cured adhesive film 4 is taken out; (3) The profile beam prepreg 5 is laid on the foam core 3 with the surface cured adhesive film 4, and laid to the remaining 5 layers of prepreg, the foam core with part of the prepreg laid, i.e. the profile beam semi-finished blank, is placed in the profile beam forming mold, as shown in Figure 1 , the upper mold 1 and the lower mold 2 are closed; (4) The mold with the profile beam semi-finished blank is placed on the heating plate of the press, heated, and kept at (40±5)℃ for 30 minutes, then pressed to the closed mold, and kept for 15 minutes; cooled to room temperature and taken out; (5) The laying of the remaining 5 layers of prepreg is completed; (6) The profile beam blank with the completed prepreg laying is placed in the profile beam forming mold structure, as shown in Figure 1 , the upper mold 1 and the lower mold 2 are closed, then placed on the heating plate of the press, heated to (80±5)℃ at a rate of not more than 3℃ / min, kept for 30-40 minutes, and pressed to 3-3.5 MPa; continue to heat to (125±5)℃, keep for 1.5-2 hours; under the pressure keeping condition, the temperature is lowered to below 60℃ at a rate of not more than 2℃ / min, and the mold is opened.

[0016] As a preferred embodiment of this invention, a molding die structure for a composite foam sandwich beam includes an upper die and a lower die, used in the compression molding process described above. The mating surfaces of the upper and lower dies coincide with the diagonal surfaces of the composite foam sandwich beam, i.e., the cavities of the upper and lower dies, which are arranged opposite to each other, are used to form the four sides of the composite foam sandwich beam, each side including two flange surfaces. Figure 2 The two vertical planes), the two web planes ( Figure 2 (Two horizontal planes in the middle).

Claims

1. A process for the compression moulding of a sandwich beam of composite foam profile, characterised in that: The method comprises the following steps: (1) laying a layer of adhesive film on the surface of the foam core, sealing with a sealing system, and vacuuming for more than 30 minutes; (2) placing the foam core with the adhesive film and the sealing system into an oven, and curing according to the process parameters of the adhesive film; (3) laying the pre-impregnated material of the mouth beam on the foam core with the cured adhesive film, and laying the remaining 5 layers of pre-impregnated material, then placing the foam core with the pre-impregnated material of the mouth beam into a mouth beam forming mold, and closing the mold; (4) placing the mold with the semi-finished blank of the mouth beam on a heating plate of a press, heating and pressing until the mold is closed, and then maintaining the temperature and pressure for 15 minutes, and then cooling to room temperature and taking out; (5) completing the laying of the remaining 5 layers of pre-impregnated material; (6) placing the semi-finished blank of the mouth beam with the laid pre-impregnated material into a mouth beam forming mold, closing the mold, and then placing the mold on a heating plate of a press; heating and curing according to the process parameters of the laid material; after completing the heating and curing, cooling to below 60℃, unloading, and taking out.

2. The process of claim 1, wherein: In step (1), the sealing system is assembled from a sealing material, a breathable material, an isolation material, and a vacuum bag.

3. The composite foam cored sandwich profile beam compression molding process method of claim 1, wherein: In step (2), the process parameters of the adhesive film are as follows: The vacuum degree of the vacuum system is not less than 0.095 MPa, the temperature is raised to (130±5)℃ at a rate of not more than 3℃ / min, the temperature is maintained for 3-4 hours, the temperature is lowered to below 60℃ at a rate of not more than 2℃ / min, the vacuum is removed, the auxiliary materials in the vacuum system are removed, and the foam core with the cured adhesive film is taken out.

4. The composite foam cored sandwich profile beam compression molding process method of claim 1, wherein: In step (4), the mold with the semi-finished blank of the mouth beam is placed on a heating plate of a press, heated, and maintained at (40±5)℃ for 30 minutes, and then pressed until the mold is closed.

5. The composite foam sandwich profiled beam compression molding process method of claim 1, wherein: In step (6), the temperature is raised to (80±5)℃ at a rate of not more than 3℃ / min on the heating plate of the press, the temperature is maintained for 30-40 minutes, and the pressure is increased to 3-3.5 MPa.

6. The process of claim 1 or 5, wherein: In step (6), the process parameters of the laid material are as follows: based on the temperature of the heating plate of the press, the temperature is further raised to (125±5)℃, and the temperature is maintained for 1.5-2 hours.

7. The process of claim 1, wherein: In step (6), the temperature is lowered at a rate of not more than 2℃ / min under the pressure maintaining condition to below 60℃.

8. A composite foam sandwich profile beam forming mould structure comprising an upper mould, a lower mould, characterised in that: The mating surfaces of the upper mold and the lower mold are coincident with the diagonal surfaces of the composite foam sandwich mouth beam.

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