CN112688083B - Manufacturing method of large-size composite sandwich structure multi-interface reflecting plate - Google Patents

Abstract

The invention discloses a manufacturing method of a large-size composite material sandwich structure multi-interface reflection plate. It includes the following steps: S1 mold pretreatment; S2 prepreg preparation; S3 laying outer skin; S4 laying foam sandwich; S5 laying metal foil; S6 laying inner skin; S7 curing molding; S8 machining pre-processing Buried holes; S9 metal embedded parts pretreatment; S10 manufacturing embedded parts positioning plate; S11 metal embedded parts installation; S12 repairing and grinding. The large-size composite sandwich structure multi-interface reflective plate of the present invention has a simple manufacturing method, the manufacturing process does not need to use a complicated mold, and the operation is convenient; the large-size composite sandwich structure multi-interface reflector manufactured by the present invention has When laying metal foils, special perforated metal foils are used to avoid the generation of air bubbles during the laying process and affect the bonding performance.

Description

A manufacturing method of a large-size composite sandwich structure multi-interface reflector

technical field

The invention relates to the technical field of radar antenna frames, in particular to a method for manufacturing a large-sized composite material sandwich structure multi-interface reflector.

Background technique

At present, many radar skeletons and reflectors are made of composite materials in order to ensure the high strength and light weight of the structure, which can provide more weight space for the top-mounted equipment. However, since there are many and scattered installation parts on the front of the reflector, in order to meet the high-precision requirements of the installation holes, it is often necessary to pre-embed the whole or a large area of aluminum alloy pre-embedded parts, so that the weight of the reflector cannot reach the ideal index.

Since both the front and back skins of the reflector are made of carbon fiber, it is difficult to achieve electrical continuity across the entire front, and radars with high telecommunications requirements cannot meet their application requirements.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for manufacturing a large-size composite sandwich structure multi-interface reflector that does not require complex molds, is simple in molding, is easy to operate, and has high precision of front mounting holes; the reflector manufactured by the present invention has a sandwich structure. The metal foil is laid in the middle, and the special perforated metal foil is used to avoid air bubbles during the laying process and affect the bonding performance. The metal foil and the aluminum alloy embedded parts are all connected to achieve continuous potential, which greatly improves the reliability of the electrical connection of the entire front. .

The present invention is achieved through the following technical solutions:

A method for manufacturing a large-sized composite material sandwich structure multi-interface reflector, characterized in that the method comprises the following steps:

S1, mold pretreatment: clean the mold, confirm that the molding surface of the mold is not damaged, and then spray the mold release agent on the mold;

S2, prepreg preparation: make a blanking diagram of the skin layup, and cut the prepreg material according to the blanking diagram for use;

S3. Laying the outer skin: According to the blanking diagram, lay the prepreg material of the outer skin in the mold laying area, and perform pre-compacting after laying;

S4. Lay the foam core: Lay a layer of adhesive film on the outer skin, then lay the foam core, and perform pre-compaction;

S5, laying metal foil: first laying a layer of adhesive film on the foam sandwich, then laying metal foil, and pre-compacting;

S6, laying the inner skin: laying a layer of adhesive film on the metal foil, then laying the prepreg material of the inner skin, and pre-compacting after laying;

S7. Curing and molding: place the above-mentioned finished product in a vacuum bag and put it into an autoclave for curing and molding; when making a vacuum bag, place a fixed block around the product (ie, the reflector) to ensure the shape of the flanging. ;

S8. Machined pre-buried holes: During the curing and forming process of the autoclave, the foam sandwich structure will have a certain amount of deformation due to the increase in temperature; The two adjacent sides of the reflector are measured by a laser tracker to ensure the verticality of the two sides. Based on this, the pre-buried holes are machined; the relative accuracy between each group of holes is ±0.2mm. , during the machining process, ensure that the machining depth value tolerance of the pre-buried holes is 0 to -0.2, and ensure that the conductive layer of the metal foil between the outer skins is not damaged; specifically, the pre-buried holes are processed from the inner skin to up to the outer skin;

S9. Pretreatment of metal embedded parts: first roughen the surface of the metal embedded parts, then carry out anodization treatment, and machine a positioning hole on the metal embedded parts;

S10. Manufacture the positioning plate for embedded parts: manufacture a positioning plate with a thickness of 3-5 mm, and process two positioning holes on the positioning plate; According to the hole positions of each group of metal embedded parts that need to be positioned on the reflector, the second positioning hole is machined, and the corresponding positioning hole three is originally provided on the reflector. The connecting bolts in the third hole can fix the positioning plate on the reflector plate; for example, the first positioning hole on the metal embedded part is M3, the second positioning hole on the positioning plate is 3-3.1mm in size, and the positioning hole on the positioning plate is M3. The positional accuracy requirement between the two positioning holes is plus or minus 0.05mm, which meets the requirements and is ready for use;

S11. Installation of metal embedded parts: apply glue on the surface of the pretreated metal embedded parts, and place them in the embedded holes, then install the positioning plate above the embedded holes and fix them on the reflector The positioning plate is used to fix the metal embedded parts during the glue coating and curing process; specifically, the surface of the metal embedded parts is coated with structural glue, and it is ensured that no glue flows into the positioning holes, To prevent it from being disassembled after being fixed with a positioning plate; connecting bolts in the second positioning hole and the first positioning hole can fix the metal embedded parts in the embedded holes, so that the metal embedded parts can be guaranteed No tiny movement occurs during the bonding and curing process, and it will not affect the final position accuracy;

S12. Repairing and grinding: After curing, the positioning plate is removed and the overflowing glue around the embedded hole is cleaned, repaired and ground to obtain a large-sized composite material sandwich structure multi-interface reflector. The prepreg and film used above need to be taken out of the cold storage one day in advance. Specifically, the prepreg in the present invention is a mixed material of glass fiber or quartz fiber and epoxy resin or cyanate resin or bismuth resin; that is, the prepreg is a glass fiber/epoxy resin composite material, Any one of glass fiber/cyanic acid resin composite material, glass fiber/bis-horse resin composite material, quartz fiber/epoxy resin composite material, quartz fiber/cyanic acid resin composite material, and quartz fiber/bis-horse resin composite material.

Further, step S1, mold pretreatment: the mold is first cleaned with gasoline, then cleaned with acetone 2-3 times, then confirm that the molding surface of the mold is not damaged, spray Loctite 770-NC release agent on the mold before use, The new mold is sprayed 8-10 times, the used mold is sprayed 3-5 times, and the interval between each spray is 10-15 minutes.

Further, in step S2, prepreg preparation: a blanking diagram of the skin layup is made by the CPD module of the Catia software, and then an automatic blanking machine is used to cut the prepreg sheet according to the blanking diagram for use.

Further, step S3, laying the outer skin: according to the blanking diagram, lay the prepreg material of the outer skin in the die laying area; the thickness of the outer skin is 0.4mm, and the prepreg is The thickness of the single layer of the material is 0.2mm. After laying the first layer of prepreg material, the first pre-compaction is carried out, and then a layer of adhesive film is applied on the first layer of prepreg material, and then the adhesive film is applied. A second layer of prepreg material is laid on top and a second pre-compaction is performed; and the pressure of the two pre-compactions is 0.08-0.10 MPa, and the pre-compaction time is 10-20 minutes.

Further, step S4, laying the foam core: laying a layer of adhesive film on the outer skin, then laying the foam core, and pre-compacting at 0.08-0.10MPa for 10-20 minutes; and the foam core The thickness is 8-10mm. Preferably, 30 minutes before use, the foam core material is taken out of the aluminum packaging bag and placed in a designated position in a constant temperature and humidity room for use.

Further, step S5, laying metal foil: first laying a layer of adhesive film on the foam sandwich, then laying metal foil on the adhesive film, and pre-compacting at 0.08-0.10MPa for 10-20 minutes ; And the metal foil is evenly provided with pores. Preferably, a special metal foil with holes is used to avoid the generation of air bubbles during the laying process and affect the bonding performance. The metal foil and the aluminum alloy embedded parts are all connected to achieve continuous potential, which greatly improves the reliability of the electrical connection of the entire front.

Further, step S6, laying the inner skin: first laying a layer of adhesive film on the metal foil, and then laying the prepreg material of the inner skin, the thickness of the inner skin is 0.4mm, the prepreg The thickness of the single layer of the prepreg sheet is 0.2mm. After laying the first layer of the prepreg sheet with the inner skin, the first pre-compaction is carried out, and then a layer of adhesive film is laid on the first layer of the prepreg sheet. , and then lay a second layer of inner skin prepreg material on the film, and perform a second pre-compaction after the second layer is laid; and the pressure of the two pre-compactions is 0.08-0.10MPa, The compaction time is 10-20 minutes.

Further, step S7, curing molding: the above-mentioned paving finished product is placed in a vacuum bag and put into an autoclave to be cured and molded by a curing curve; when making the vacuum bag, a fixed barrier is placed around the product (reflector) block to ensure the shape of the flanging. Specifically, the fixed stopper is made of steel material, and the fixed stopper is positioned on the laying mold through positioning pins, and is fixed on the surface of the mold through bolts to ensure the size of the reflector.

Further, step S9, pre-processing of the metal embedded parts: first, the surface of the metal embedded parts is processed into threads, and then subjected to sulfuric acid anodizing surface treatment; the metal embedded parts are made of aluminum alloy 5A06 material. Preferably, the outer surface of the metal embedded parts is machined with shallow threads or other methods of increasing surface roughness are adopted, which can improve the bonding strength between the metal embedded parts and the foam core material, and then sulfuric acid anodization is required for the surface. Treatment to avoid potential corrosion of aluminum alloy and carbon fiber composite parts. Preferably, the metal embedded part of the radar reflector is made of aluminum alloy 5A06, which has high strength and corrosion stability, is suitable for use in high temperature and high humidity environments, and has a low density of aluminum alloy materials, which meets the requirements of radar skeleton High demands on structural weight reduction.

Further, step S11, installation of metal embedded parts: the curing is room temperature curing, and the curing time is 20-24 hours.

Beneficial effects of the present invention:

The large-size composite sandwich structure multi-interface reflective plate of the present invention has a simple manufacturing method, the manufacturing process does not need to use a complicated mold, and the operation is convenient; the large-size composite sandwich structure multi-interface reflector manufactured by the present invention has When laying metal foils, special perforated metal foils are used to avoid air bubbles during the laying process and affect the bonding performance.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a partial installation diagram of a positioning plate of the present invention;

2 is a structural diagram of a large-size composite material sandwich structure multi-interface reflector of the present invention;

Figure 3 is a curing curve graph.

In the picture: 1 Reflector, 2 Embedded holes, 3 Metal embedded parts, 4 Outer skin, 5 Foam sandwich, 6 Metal foil, 7 Inner skin, 8 Positioning plate, 9 Positioning hole 1, 10 Positioning hole 2 , 11 positioning holes three, 12 bolts.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in Figure 2, a method for manufacturing a large-size composite sandwich structure multi-interface reflector includes the following steps:

S1. Mold pretreatment: Clean the mold with gasoline first, then with acetone for 2-3 times, and then confirm that the molding surface of the mold is not damaged, spray Loctite 770-NC release agent on the mold before use (spray 8 for the new mold -10 times, the mold is sprayed 3-5 times after use, and the interval between each spray is 10-15 minutes);

S2, prepreg preparation: make a blanking diagram of the skin layup through the CPD module of the Catia software, and then use an automatic blanking machine to cut the prepreg material according to the blanking diagram, and wait for use;

S3, laying the outer skin: according to the blanking diagram, lay the prepreg material of the outer skin 4 in the mold laying area; the thickness of the outer skin 4 is 0.4mm, and the prepreg material The thickness of the single layer is 0.2mm, so it is necessary to lay two layers of prepreg, and the first pre-compaction is carried out after laying the first layer of prepreg, and the pressure of pre-compaction is 0.08MPa, Pre-compact for 15 minutes; then lay a layer of adhesive film on the first layer of prepreg material, then spread a second layer of prepreg material on the adhesive film and carry out a second pre-compaction, and the second layer of prepreg material The pressure of the secondary pre-compaction is 0.08MPa, and the pre-compaction is 15 minutes; the outer skin 4 is formed after the two-layer prepreg material is laid;

S4. Lay the foam core: spread a layer of adhesive film on the outer skin 4, then spread the foam core 5, and pre-compact it at 0.08MPa for 15 minutes after the laying is completed; and the thickness of the foam core 5 is 10mm;

S5. Lay metal foil: firstly lay a layer of adhesive film on the foam core 5, and then apply metal foil 6 on the adhesive film. After the metal foil 6 is laid, pre-press at 0.08MPa 15 minutes; and the metal foil 6 has pores; a special perforated metal foil is used to avoid air bubbles during the laying process and affect the bonding performance, and the metal foil and the aluminum alloy embedded parts are all connected to achieve a continuous potential Improve the reliability of the electrical connection of the entire front;

S6, laying the inner skin: first lay a layer of adhesive film on the metal foil 6, and then lay the prepreg material of the inner skin 7, the thickness of the inner skin is 0.4mm, the prepreg The thickness of a single layer of the material sheet is 0.2mm, so it is necessary to lay two layers of prepreg material sheets. The actual pressure is 0.08MPa, and the pre-compacting is 15 minutes; then a layer of adhesive film is laid on the first layer of prepreg material, and then the prepreg material of the second layer of inner skin 7 is spread on the adhesive film. Carry out the second pre-compaction, and the pressure of the second pre-compaction is 0.08MPa, and the pre-compaction is 15 minutes; the inner skin 7 is formed after the last two layers of prepreg material are laid;

S7. Curing and molding: put the above-mentioned finished product in a vacuum bag and put it into an autoclave to be cured and molded according to the curing curve; when making the vacuum bag, place a fixed stop around the reflector 1 to ensure the turning edge shape; curing curve is shown in Figure 3;

S8. Machined pre-buried holes: During the curing and forming process of the autoclave, the foam sandwich core 5 will have a certain amount of deformation due to the temperature rise; 1. Two adjacent sides are measured by a laser tracker to ensure the verticality of the two sides. Based on this, the pre-buried holes are machined by 2 positions; the relative accuracy between each group of holes is ±0.2mm. , During the machining process, ensure that the machining depth value tolerance of the pre-buried hole 2 is 0 to -0.2, and ensure that the conductive layer of the metal foil 6 between the outer skin 4 is not damaged;

S9. Pretreatment of metal embedded parts: First, the surface of metal embedded parts 3 is processed into threads, and then sulfuric acid anodic oxidation surface treatment is performed, and positioning holes-9 are processed on metal embedded parts 3; The embedded part 3 is made of aluminum alloy 5A06, which has high strength and corrosion stability, and is suitable for use in high temperature and high humidity environments, and the density of the aluminum alloy material is low, which meets the high requirements of the radar skeleton for structural weight reduction;

S10, manufacturing the positioning plate for embedded parts: manufacturing the positioning plate 8 with a thickness of 3 mm, and machining the positioning hole 2 10 on the positioning plate 8; preferably, the positioning plate 8 is a thin steel plate with a thickness of 3 mm;

S11. Installation of metal embedded parts: apply glue on the surface of the pretreated metal embedded parts 3 and place them in the embedded holes 2, and then install the positioning plate 8 above the embedded holes 2, And fixed on the reflective plate 1, the positioning plate 8 is used to fix the metal embedded parts 3 during the glue coating and curing process; apply structural glue to the surface of the metal embedded parts 3, and ensure that the positioning holes are There is no glue flowing into 9 to prevent it from being disassembled after being fixed with the positioning plate 8; as shown in Figure 1, connecting bolts in the positioning hole two 10 and the positioning hole one 9 can fix the metal embedded part 3 in the embedded hole. In 2, this can ensure that the metal embedded parts do not move slightly during the process of bonding and curing, and will not affect the final position accuracy; the connecting bolts 12 in the second positioning hole 10 and the positioning hole three 11 can fix the positioning plate 8. Installed on the reflector 1;

S12. Repair and polishing: After curing, remove the positioning plate 8 and clean, repair and polish the overflowing glue around the embedded hole 2 to obtain the large-size composite sandwich structure multi-interface reflector 1 of the present invention.

The above-mentioned prepreg can be selected from glass fiber/epoxy resin composite material, glass fiber/cyanic acid resin composite material, glass fiber/double horse resin composite material, quartz fiber/epoxy resin composite material, quartz fiber/cyanic acid resin composite material. Any of materials, quartz fiber/bihorse resin composite materials.

The above-mentioned preferred embodiments of the present invention are only used to explain the present invention, and are not intended to limit the present invention. Any obvious changes or changes derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (8)

1. a manufacturing method of a large-size composite material sandwich structure multi-interface reflector, is characterized in that, the method comprises the steps: S1, mold pretreatment: clean the mold, confirm that the molding surface of the mold is not damaged, and then spray the mold release agent on the mold; S2, prepreg preparation: make a blanking diagram of the skin layup, and cut the prepreg material according to the blanking diagram for use; S3. Laying the outer skin: According to the blanking diagram, lay the prepreg material of the outer skin in the mold laying area, and perform pre-compacting after laying; S4. Lay the foam core: Lay a layer of adhesive film on the outer skin, then lay the foam core, and perform pre-compaction; S5, laying metal foil: first laying a layer of adhesive film on the foam sandwich, then laying metal foil, and pre-compacting; S6, laying the inner skin: laying a layer of adhesive film on the metal foil, then laying the prepreg material of the inner skin, and pre-compacting after laying; S7. Curing and molding: place the above-mentioned finished product in a vacuum bag and put it into an autoclave for curing and molding; when making a vacuum bag, place a fixed block around the product to ensure the shape of the flanging; S8. Machined pre-buried holes: During the curing and forming process of the autoclave, the foam sandwich will have a certain amount of deformation due to the increase in temperature; according to the actual forming results, determine the machine-added benchmark for the pre-buried holes, first select the reflector The two adjacent sides are measured by a laser tracker to ensure the verticality of the two sides. Based on this, the pre-buried holes are machined; the relative accuracy between each group of holes is ±0.2mm, and the machine During the adding process, ensure that the machining depth value tolerance of the embedded hole is 0 to -0.2, and ensure that the conductive layer of the metal foil between the outer skins is not damaged; S9. Pretreatment of metal embedded parts: first roughen the surface of the metal embedded parts, then carry out anodization treatment, and machine a positioning hole on the metal embedded parts; S10. Manufacture the positioning plate for embedded parts: manufacture a positioning plate with a thickness of 3-5mm, and process two positioning holes on the positioning plate; S11. Installation of metal embedded parts: apply glue on the surface of the pretreated metal embedded parts, and place them in the embedded holes, then install the positioning plate above the embedded holes and fix them on the reflector The positioning plate is used to fix the metal embedded parts during the glue coating and curing process; S12. Repair and polishing: After curing, remove the positioning plate and clean, repair and polish the overflowing glue around the embedded hole to obtain a large-size composite sandwich structure multi-interface reflector; Step S5, laying metal foil: first laying a layer of adhesive film on the foam sandwich, then laying metal foil on the adhesive film, and pre-compacting at 0.08-0.10 MPa for 10-20 minutes; The metal foil is evenly provided with fine holes; Step S9, pretreatment of metal embedded parts: firstly, the surface of the metal embedded parts is processed into threads, and then subjected to sulfuric acid anodizing surface treatment, and a positioning hole is machined on the metal embedded parts; The embedded parts are made of aluminum alloy 5A06. 2. the manufacture method of a kind of large-size composite material sandwich structure multi-interface reflecting plate according to claim 1, is characterized in that, step S1, mould pretreatment: mould is first cleaned with gasoline, then cleaned with acetone 2- 3 times, and then confirm that the molding surface of the mold is not damaged, spray Loctite 770-NC mold release agent on the mold before use, spray 8-10 times for the new mold, and spray the mold after use 3-5 times, each spraying interval 10 -15 minutes. 3. the manufacturing method of a kind of large-size composite material sandwich structure multi-interface reflector plate according to claim 1, is characterized in that, step S2, prepreg preparation: make skin layup by the CPD module of Catia software According to the blanking diagram, use an automatic blanking machine to cut the prepreg material for use. 4. the manufacturing method of a kind of large-size composite material sandwich structure multi-interface reflector plate according to claim 1, it is characterized in that, step S3, paving outer skin: according to the cutting diagram, paving in the mold paving area A prepreg sheet with an outer skin; the thickness of the outer skin is 0.4mm, the thickness of a single layer of the prepreg sheet is 0.2mm, and the first layer of prepreg One pre-compaction, then a layer of adhesive film is placed on the first layer of prepreg, followed by a second layer of prepreg and a second pre-compaction on the adhesive film; and two The pre-compaction pressure is 0.08-0.10MPa, and the pre-compaction time is 10-20 minutes. 5. The method for manufacturing a large-size composite sandwich structure multi-interface reflective plate according to claim 1, wherein step S4, laying a foam sandwich: laying a layer of adhesive film on the outer skin, Then, the foam core is spread and pre-compacted at 0.08-0.10MPa for 10-20 minutes; and the thickness of the foam core layer is 8-10mm. 6. The manufacturing method of a large-size composite sandwich structure multi-interface reflector according to claim 1, wherein step S6, laying an inner skin: first laying a layer of glue on the metal foil film, and then lay a prepreg sheet with an inner skin, the thickness of the inner skin is 0.4mm, the thickness of a single layer of the prepreg sheet is 0.2mm, and the prepreg of the first layer of inner skin is laid After the material, the first pre-compaction is carried out, and then a layer of adhesive film is applied on the first layer of prepreg material, and then a second layer of inner skin prepreg material is applied on the adhesive film. The second pre-compaction is carried out after the paving; and the pressure of the two pre-compactions is 0.08-0.10 MPa, and the pre-compaction time is 10-20 minutes. 7. the manufacturing method of a kind of large-size composite sandwich structure multi-interface reflector plate according to claim 1, is characterized in that, step S7, curing molding: the above-mentioned paving finished product is placed in a vacuum bag and is Put it into an autoclave and form it according to the curing curve; when making a vacuum bag, place a fixed stop around the product to ensure the shape of the flanging. 8. The method for manufacturing a large-size composite sandwich structure multi-interface reflector according to claim 1, wherein step S11, installation of metal embedded parts: the curing is room temperature curing, and the curing time is for 20-24 hours.

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