CN112688083B - Manufacturing method of large-size composite sandwich structure multi-interface reflecting plate - Google Patents
Manufacturing method of large-size composite sandwich structure multi-interface reflecting plate Download PDFInfo
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Abstract
The invention discloses a method for manufacturing a large-size composite sandwich structure multi-interface reflecting plate. The method comprises the following steps: s1, preprocessing a mould; s2, preparing a prepreg; s3 paving an outer skin; s4, paving a foam sandwich; s5, paving a metal foil; s6 paving an inner skin; s7, curing and forming; s8 machining the pre-buried hole; s9 pre-treating a metal embedded part; s10, manufacturing an embedded part positioning plate; s11 installing a metal embedded part; and S12 repairing and grinding. The manufacturing method of the large-size composite sandwich structure multi-interface reflecting plate is simple, a complex die is not required in the manufacturing process, and the operation is convenient; according to the large-size composite sandwich structure multi-interface reflecting plate manufactured by the invention, the metal foil is laid in the sandwich structure, the purpose-made perforated metal foil is adopted to avoid bubbles generated in the laying and pasting process from influencing the bonding performance, the metal foil and the aluminum alloy embedded part are completely connected to realize potential continuity, and the reliability of the electric connection of the whole array surface is greatly improved.
Description
Technical Field
The invention relates to the technical field of radar antenna frameworks, in particular to a method for manufacturing a large-size composite sandwich structure multi-interface reflecting plate.
Background
At present, many radar frameworks and reflecting plates are manufactured by adopting composite materials for ensuring high strength and light weight of the structure, so that more weight space can be provided for the upper equipment. However, because the installation parts of the reflecting plate array surface are numerous and dispersed, the whole or large-area aluminum alloy embedded part is often embedded to meet the high-precision requirement of the installation hole position, so that the weight of the reflecting plate cannot reach an ideal index.
Because the skins on the array side and the back side of the reflecting plate are made of carbon fiber materials, the electric continuity of the whole array surface is difficult to realize, and the radar with higher telecommunication requirements cannot meet the use requirements.
Disclosure of Invention
The invention aims to provide a method for manufacturing a large-size composite sandwich structure multi-interface reflecting plate which does not need a complex mould, is simple to form and convenient to operate, and has high accuracy of array surface mounting hole positions; according to the reflecting plate manufactured by the invention, the metal foil is laid in the interlayer structure, the purpose-made perforated metal foil is adopted to avoid bubbles generated in the laying and pasting process from influencing the gluing performance, the metal foil is completely connected with the aluminum alloy embedded part to realize potential continuity, and the reliability of electric connection of the whole array surface is greatly improved.
The invention is realized by the following technical scheme:
a method for manufacturing a large-size composite sandwich structure multi-interface reflecting plate is characterized by comprising the following steps:
s1, mold pretreatment: cleaning the mold, confirming that the molding surface of the mold is not damaged, and spraying a release agent on the mold;
s2, prepreg preparation: manufacturing a blanking drawing of a skin laying layer, and cutting a prepreg sheet according to the blanking drawing for later use;
s3, paving an outer skin: according to a blanking drawing, paving and sticking the prepreg sheets of the outer skin in a mould paving and sticking area, and performing pre-compaction after paving and sticking;
s4, paving a foam sandwich: paving and sticking a layer of adhesive film on the outer skin, then paving and sticking a foam sandwich, and performing pre-compaction;
s5, paving a metal foil: firstly, paving a layer of adhesive film on the foam sandwich, then paving a metal foil, and performing pre-compaction;
s6, paving an inner skin: paving a layer of adhesive film on the metal foil, then paving a prepreg sheet of the inner skin, and performing pre-compaction after paving;
s7, curing and forming: placing the paved product in a vacuum bag and putting the vacuum bag into an autoclave for curing and forming; when the vacuum bag is manufactured, fixed stop blocks are arranged on the periphery of a product (namely a reflecting plate) to ensure the shape of a turned edge;
s8, machining the embedded hole: in the autoclave curing and forming process, the foam sandwich structural member has a certain deformation amount due to the temperature rise; according to an actual forming result, determining a machining standard of an embedded hole position, firstly selecting two adjacent edges of a reflecting plate, measuring by using a laser tracker to ensure the verticality of the two edge surfaces, and performing machining on the embedded hole position by using the verticality as a machining standard; the relative precision requirement among each group of holes is +/-0.2 mm, the tolerance of the depth value of the pre-buried holes is ensured to be 0 to-0.2 in the machining process, and the metal foil conducting layer between the outer skins is ensured not to be damaged; specifically, the pre-buried hole is processed from the inner skin to the outer skin;
s9, preprocessing a metal embedded part: roughening the surface of a metal embedded part, then carrying out anodic oxidation treatment, and processing a first positioning hole on the metal embedded part;
s10, manufacturing an embedded part positioning plate: manufacturing a positioning plate with the thickness of 3-5mm, and processing a positioning hole II on the positioning plate; specifically, the positioning plate is a thin steel plate part with the thickness of 3-5mm, a positioning hole II is machined in the upper part of the thin steel plate part according to the hole position of each group of metal embedded parts needing to be positioned on the reflecting plate, a positioning hole III is correspondingly arranged on the reflecting plate originally, and the positioning plate can be fixedly installed on the reflecting plate through connecting bolts in the positioning hole II and the positioning hole III; 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 position precision requirement of the two positioning holes on the positioning plate is plus or minus 0.05mm, so that the requirement is met for standby application;
s11, mounting a metal embedded part: gluing the surface of the pretreated metal embedded part, placing the metal embedded part in the embedded hole, then installing the positioning plate above the embedded hole and fixing the positioning plate on the reflecting plate, wherein the positioning plate is used for fixing the metal embedded part in the gluing and curing process; specifically, structural adhesive is coated on the surface of the metal embedded part, and no adhesive flows into the first positioning hole, so that the situation that the metal embedded part cannot be detached after being fixed by the positioning plate is prevented; connecting bolts in the second positioning hole and the first positioning hole can fix the metal embedded part in the pre-embedded hole, so that the metal embedded part can be prevented from micro-moving in the bonding and curing process, and the final position precision is not influenced;
s12, repairing and polishing: and after the curing is finished, removing the positioning plate, and cleaning, repairing and polishing the excessive glue around the pre-buried hole to obtain the large-size composite sandwich structure multi-interface reflecting plate. The prepreg and the adhesive film used above need to be taken out from a refrigeration house one day in advance. Specifically, the prepreg is a mixed material of glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin; namely, the prepreg is any one of a glass fiber/epoxy resin composite material, a glass fiber/cyanic acid resin composite material, a glass fiber/bismaleimide resin composite material, a quartz fiber/epoxy resin composite material, a quartz fiber/cyanic acid resin composite material and a quartz fiber/bismaleimide resin composite material.
Further, step S1, mold preprocessing: the mould is cleaned by gasoline and acetone for 2-3 times, then the molding surface of the mould is confirmed to be not damaged, before use, a loctite 770-NC mould release agent is sprayed on the mould, a new mould is sprayed for 8-10 times, the used mould is sprayed for 3-5 times, and the spraying interval is 10-15 minutes each time.
Further, step S2, prepreg preparation: manufacturing a blanking drawing of the skin laying layer through a CPD module of Catia software, and cutting a prepreg sheet by using an automatic blanking machine according to the blanking drawing for later use.
Further, step S3, paving the outer skin: according to the blanking drawing, paving the prepreg sheets of the outer skin on the paving area of the mould; the thickness of the outer skin is 0.4mm, the thickness of a single layer of the prepreg sheet is 0.2mm, the first pre-compaction is carried out after the first layer of prepreg sheet is paved, then a layer of adhesive film is paved on the first layer of prepreg sheet, and then the second layer of prepreg sheet is paved on the adhesive film and the second pre-compaction is carried out; and the pre-compaction pressure of the two times is 0.08-0.10MPa, and the pre-compaction time is 10-20 minutes.
Further, step S4, paving a foam sandwich: paving a layer of adhesive film on the outer skin, then paving the foam sandwich, and pre-compacting for 10-20 minutes under 0.08-0.10 MPa; and the thickness of the foam sandwich is 8-10 mm. Preferably, the foam sandwich material is taken out of the aluminum packaging bag 30 minutes before use and is placed in a designated position of a constant temperature and humidity room for standby.
Further, step S5, paving a metal foil: firstly, paving a layer of adhesive film on the foam sandwich, then paving a metal foil on the adhesive film, and pre-compacting for 10-20 minutes under the pressure of 0.08-0.10 MPa; and the metal foil is uniformly provided with fine holes. Preferably, the specially-made perforated metal foil is adopted to avoid bubbles generated in the paving and pasting process from influencing the gluing performance, the metal foil is completely connected with the aluminum alloy embedded part to realize potential continuity, and the reliability of electric connection of the whole array surface is greatly improved
Further, step S6, paving the inner skin: firstly, paving a layer of adhesive film on the metal foil, then paving a prepreg sheet of an inner skin, wherein the thickness of the inner skin is 0.4mm, the thickness of a single layer of the prepreg sheet is 0.2mm, performing primary pre-compaction after paving the prepreg sheet of the first layer of the inner skin, then paving a layer of adhesive film on the first layer of the prepreg sheet, then paving a prepreg sheet of a second layer of the inner skin on the adhesive film, and performing secondary pre-compaction after paving the second layer; the pressure of the two times of pre-compaction is 0.08-0.10MPa, and the pre-compaction time is 10-20 minutes.
Further, step S7, curing and molding: placing the paved product in a vacuum bag and placing the vacuum bag in an autoclave for curing and molding according to a curing curve; when the vacuum bag is manufactured, fixed stop blocks are arranged around the product (the reflecting plate) to ensure the shape of the flanging. Specifically, fixed dog adopts the steel material, and fixed dog passes through the locating pin and is positioned on spreading the subsides mould to through the bolt fastening on the surface of mould, in order to ensure the size of reflecting plate.
Further, step S9, preprocessing a metal embedded part: firstly, processing threads on the surface of a metal embedded part, and then carrying out sulfuric acid anodic oxidation surface treatment; the metal embedded part is made of an aluminum alloy 5A06 material. Preferably, shallow threads are machined on the outer surface of the metal embedded part or other modes for increasing the surface roughness are adopted, so that the bonding strength between the metal embedded part and the foam core material can be improved, and then sulfuric acid anodizing surface treatment is carried out to avoid the potential corrosion phenomenon of the aluminum alloy and carbon fiber composite material part. Preferably, the radar reflecting plate metal embedded part is made of an aluminum alloy 5A06 material, the aluminum alloy material has high strength and corrosion stability, is suitable for being used in a high-temperature high-humidity environment, and has low density, so that the high requirement of a radar framework on weight reduction of the structure is met.
Further, step S11, installing a metal embedded part: the curing is normal temperature curing, and the curing time is 20-24 hours.
The invention has the beneficial effects that:
the manufacturing method of the large-size composite sandwich structure multi-interface reflecting plate is simple, a complex die is not required in the manufacturing process, and the operation is convenient; according to the large-size composite sandwich structure multi-interface reflecting plate manufactured by the invention, the metal foil is laid in the sandwich structure, the purpose-made perforated metal foil is adopted to avoid bubbles generated in the laying and pasting process from influencing the bonding performance, the metal foil and the aluminum alloy embedded part are completely connected to realize potential continuity, and the reliability of the electric connection of the whole array surface is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings may be obtained according to these drawings without creative efforts.
FIG. 1 is a partial mounting view of the alignment plate of the present invention;
FIG. 2 is a structural diagram of a large-sized composite sandwich structure multi-interface reflecting plate according to the present invention;
FIG. 3 is a graph of cure.
In the figure: 1 reflecting plate, 2 pre-buried holes, 3 metal embedded parts, 4 outer skins, 5 foam sandwich cores, 6 metal foils, 7 inner skins, 8 positioning plates, 9 positioning holes I, 10 positioning holes II, 11 positioning holes III and 12 bolts.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 2, the method for manufacturing a large-size composite sandwich structure multi-interface reflecting plate includes the following steps:
s1, preprocessing the die: cleaning a mould with gasoline, cleaning with acetone for 2-3 times, then confirming that the molding surface of the mould is not damaged, and spraying a letai 770-NC release agent on the mould before use (spraying a new mould for 8-10 times, spraying the used mould for 3-5 times, and spraying each time at an interval of 10-15 minutes);
s2, prepreg preparation: manufacturing a blanking drawing of a skin laying layer through a CPD module of Catia software, and cutting a prepreg sheet by using an automatic blanking machine according to the blanking drawing for later use;
s3, paving an outer skin: according to the blanking drawing, paving the prepreg sheets of the outer skin 4 in the mould paving area; the thickness of the outer skin 4 is 0.4mm, the thickness of a single layer of the prepreg sheet is 0.2mm, two layers of prepreg sheets need to be paved, and pre-compaction is carried out for 15 minutes after the first layer of prepreg sheet is paved, wherein the pre-compaction pressure is 0.08 MPa; then paving a layer of adhesive film on the first layer of prepreg material sheet, paving a second layer of prepreg material sheet on the adhesive film, and performing second pre-compaction for 15 minutes at the pressure of 0.08 MPa; forming an outer skin 4 after the two layers of prepreg sheets are paved;
s4, paving a foam sandwich: paving a layer of adhesive film on the outer skin 4, then paving the foam sandwich 5, and pre-compacting for 15 minutes under 0.08MPa after paving; the thickness of the foam sandwich 5 is 10 mm;
s5, paving a metal foil: firstly, paving a layer of adhesive film on the foam sandwich 5, then paving a metal foil 6 on the adhesive film, and pre-compacting the metal foil 6 for 15 minutes under 0.08MPa after the metal foil 6 is paved; the metal foil 6 is provided with pores; the specially-made perforated metal foil is adopted to avoid bubbles generated in the paving and pasting process from influencing the gluing performance, the metal foil is completely connected with the aluminum alloy embedded part to realize potential continuity, and the reliability of the electric connection of the whole array surface is greatly improved;
s6, paving an inner skin: firstly, paving a layer of adhesive film on the metal foil 6, then paving a prepreg sheet of the inner skin 7, wherein the thickness of the inner skin is 0.4mm, the thickness of a single layer of the prepreg sheet is 0.2mm, so that two layers of prepreg sheets need to be paved, and pre-compacting is carried out for the first time after the prepreg sheet of the first layer of inner skin 7 is paved, wherein the pre-compacting pressure is 0.08MPa, and the pre-compacting time is 15 minutes; then, paving a layer of adhesive film on the first layer of prepreg sheet, paving a second layer of inner skin 7 prepreg sheet on the adhesive film, and performing pre-compaction for 15 minutes at the pressure of 0.08 MPa; forming an inner skin 7 after the final two layers of prepreg sheets are laid and attached;
s7, curing and forming: placing the paved product in a vacuum bag, and placing the vacuum bag in an autoclave for curing and forming according to a curing curve; when the vacuum bag is manufactured, fixed stop blocks are arranged on the periphery of the reflecting plate 1 and used for ensuring the shape of a turned edge; the curing curve is shown in FIG. 3;
s8, machining the embedded hole: in the autoclave curing and forming process, the foam sandwich 5 has a certain deformation amount due to the temperature rise; according to an actual forming result, determining a machining reference of a 2-position pre-buried hole, selecting two adjacent edges of the reflecting plate 1, measuring by using a laser tracker to ensure the perpendicularity of the two edge surfaces, and performing machining on the 2-position pre-buried hole by using the perpendicularity as a machining reference; the relative precision requirement among each group of holes is +/-0.2 mm, the tolerance of the depth value of the pre-buried holes 2 is ensured to be 0 to-0.2 in the machining process, and the conductive layer of the metal foil 6 between the outer skin 4 is ensured not to be damaged;
s9, preprocessing a metal embedded part: firstly, processing threads on the surface of a metal embedded part 3, then carrying out sulfuric acid anodic oxidation surface treatment, and processing a first positioning hole 9 on the metal embedded part 3; the metal embedded part 3 is made of an aluminum alloy 5A06 material, the aluminum alloy material has high strength and corrosion stability, is suitable for high-temperature and high-humidity environments, has low density, and meets the high requirement of a radar framework on weight reduction of a structure;
s10, manufacturing an embedded part positioning plate: manufacturing a positioning plate 8 with the thickness of 3mm, and processing a positioning hole II 10 on the positioning plate 8; preferably, the positioning plate 8 is a thin steel plate 3mm thick;
s11, mounting a metal embedded part: gluing the surface of the pretreated metal embedded part 3, placing the metal embedded part in the embedded hole 2, then installing the positioning plate 8 above the embedded hole 2 and fixing the positioning plate on the reflecting plate 1, wherein the positioning plate 8 is used for fixing the metal embedded part 3 in the gluing and curing process; coating structural adhesive on the surface of the metal embedded part 3, ensuring that no adhesive flows into the first positioning hole 9, and preventing the metal embedded part from being fixed by the positioning plate 8 and then being not detached; as shown in fig. 1, the metal embedded part 3 can be fixed in the pre-embedded hole 2 by connecting bolts in the second positioning hole 10 and the first positioning hole 9, so that the metal embedded part is prevented from slightly moving in the bonding and curing process, and the final position precision is not influenced; the positioning plate 8 can be fixedly arranged on the reflecting plate 1 by connecting bolts 12 in the second positioning hole 10 and the third positioning hole 11;
s12, repairing and polishing: and after the curing is finished, removing the positioning plate 8, and cleaning, repairing and polishing the excessive glue around the pre-buried hole 2 to obtain the large-size composite sandwich structure multi-interface reflecting plate 1.
The prepreg can be any one of a glass fiber/epoxy resin composite material, a glass fiber/cyanic acid resin composite material, a glass fiber/bismaleimide resin composite material, a quartz fiber/epoxy resin composite material, a quartz fiber/cyanic acid resin composite material and a quartz fiber/bismaleimide resin composite material.
The above-mentioned preferred embodiments of the present invention are provided for illustration only and not for the purpose of limiting the invention. Obvious variations or modifications of the present invention are within the scope of the present invention.
Claims (8)
1. A method for manufacturing a large-size composite sandwich structure multi-interface reflecting plate is characterized by comprising the following steps:
s1, mold pretreatment: cleaning the mold, confirming that the molding surface of the mold is not damaged, and spraying a release agent on the mold;
s2, prepreg preparation: manufacturing a blanking drawing of a skin laying layer, and cutting a prepreg sheet according to the blanking drawing for later use;
s3, paving an outer skin: according to a blanking drawing, paving and sticking the prepreg sheets of the outer skin in a mould paving and sticking area, and performing pre-compaction after paving and sticking;
s4, paving a foam sandwich: paving and sticking a layer of adhesive film on the outer skin, then paving and sticking a foam sandwich, and performing pre-compaction;
s5, paving a metal foil: firstly, paving a layer of adhesive film on the foam sandwich, then paving a metal foil, and performing pre-compaction;
s6, paving an inner skin: paving a layer of adhesive film on the metal foil, then paving a prepreg sheet of the inner skin, and performing pre-compaction after paving;
s7, curing and forming: placing the paved product in a vacuum bag and putting the vacuum bag into an autoclave for curing and forming; when the vacuum bag is manufactured, fixed stop blocks are arranged on the periphery of the product and used for ensuring the shape of the turned edge;
s8, machining the embedded hole: during the curing and forming process of the autoclave, the foam sandwich has a certain deformation amount due to the temperature rise; according to an actual forming result, determining a machining reference of an embedded hole position, firstly selecting two adjacent edges of a reflecting plate, measuring by using a laser tracker to ensure the verticality of the two edge surfaces, and performing machining on the embedded hole position by using the verticality as a machining reference; the relative precision requirement among each group of holes is +/-0.2 mm, the tolerance of the depth value of the pre-buried holes is ensured to be 0 to-0.2 in the machining process, and the metal foil conducting layer between the outer skins is ensured not to be damaged;
s9, preprocessing a metal embedded part: roughening the surface of a metal embedded part, then carrying out anodic oxidation treatment, and processing a first positioning hole on the metal embedded part;
s10, manufacturing an embedded part positioning plate: manufacturing a positioning plate with the thickness of 3-5mm, and processing a positioning hole II on the positioning plate;
s11, mounting a metal embedded part: gluing the surface of the pretreated metal embedded part, placing the metal embedded part in the embedded hole, then installing the positioning plate above the embedded hole and fixing the positioning plate on the reflecting plate, wherein the positioning plate is used for fixing the metal embedded part in the gluing and curing process;
s12, repairing and polishing: after the curing is finished, removing the positioning plate, cleaning, repairing and polishing the excessive glue around the pre-buried hole to obtain the large-size composite sandwich structure multi-interface reflecting plate;
step S5, paving metal foil: firstly, paving a layer of adhesive film on the foam sandwich, then paving a metal foil on the adhesive film, and pre-compacting for 10-20 minutes under the pressure of 0.08-0.10 MPa; and the metal foil is uniformly provided with pores;
step S9, preprocessing a metal embedded part: firstly, machining threads on the surface of a metal embedded part, then carrying out sulfuric acid anodic oxidation surface treatment, and machining a first positioning hole on the metal embedded part; the metal embedded part is made of an aluminum alloy 5A06 material.
2. The method for manufacturing a large-size composite sandwich structure multi-interface reflecting plate according to claim 1, wherein the step S1, the mold pretreatment: the mould is cleaned by gasoline and acetone for 2-3 times, then the molding surface of the mould is confirmed to be not damaged, before use, a loctite 770-NC mould release agent is sprayed on the mould, a new mould is sprayed for 8-10 times, the used mould is sprayed for 3-5 times, and the spraying interval is 10-15 minutes each time.
3. The method for manufacturing the large-size composite sandwich structure multi-interface reflecting plate according to claim 1, wherein the step S2 is to prepare a prepreg: manufacturing a blanking drawing of the skin laying layer through a CPD module of Catia software, and cutting a prepreg sheet by using an automatic blanking machine according to the blanking drawing for later use.
4. The method for manufacturing the large-size composite sandwich structure multi-interface reflecting plate according to claim 1, wherein the step S3 is to lay an outer skin: according to the blanking drawing, paving the prepreg sheets of the outer skin on the paving area of the mould; the thickness of the outer skin is 0.4mm, the thickness of a single layer of the prepreg sheet is 0.2mm, the first pre-compaction is carried out after the first layer of prepreg sheet is paved, then a layer of adhesive film is paved on the first layer of prepreg sheet, and then the second layer of prepreg sheet is paved on the adhesive film and the second pre-compaction is carried out; the pressure of the two times of pre-compaction 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 reflecting plate according to claim 1, wherein the step S4 of paving the foam sandwich: paving a layer of adhesive film on the outer skin, then paving the foam sandwich, and pre-compacting for 10-20 minutes under 0.08-0.10 MPa; and the thickness of the foam sandwich layer is 8-10 mm.
6. The method for manufacturing the large-size composite sandwich structure multi-interface reflecting plate according to claim 1, wherein the step S6 is to lay down the inner skin: firstly, paving a layer of adhesive film on the metal foil, then paving a prepreg sheet of an inner skin, wherein the thickness of the inner skin is 0.4mm, the thickness of a single layer of the prepreg sheet is 0.2mm, performing primary pre-compaction after paving the prepreg sheet of the first layer of the inner skin, then paving a layer of adhesive film on the first layer of the prepreg sheet, then paving a prepreg sheet of a second layer of the inner skin on the adhesive film, and performing secondary pre-compaction after paving the second layer; the pressure of the two times of pre-compaction is 0.08-0.10MPa, and the pre-compaction time is 10-20 minutes.
7. The method for manufacturing a large-size composite sandwich structure multi-interface reflecting plate according to claim 1, wherein the step S7 is to cure and form: placing the paved product in a vacuum bag and placing the vacuum bag in an autoclave for curing and molding according to a curing curve; and when the vacuum bag is manufactured, fixed stop blocks are arranged around the product and used for ensuring the shape of the turned edge.
8. The manufacturing method of the large-size composite sandwich structure multi-interface reflecting plate according to claim 1, wherein the step S11 is implemented by installing metal embedded parts: the curing is normal temperature curing, and the curing time is 20-24 hours.
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