CN112590247A - Method for integrally forming C-sandwich flat radome - Google Patents
Method for integrally forming C-sandwich flat radome Download PDFInfo
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- CN112590247A CN112590247A CN202011379028.2A CN202011379028A CN112590247A CN 112590247 A CN112590247 A CN 112590247A CN 202011379028 A CN202011379028 A CN 202011379028A CN 112590247 A CN112590247 A CN 112590247A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/58—Applying the releasing agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/70—Maintenance
- B29C33/72—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/545—Perforating, cutting or machining during or after moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3456—Antennas, e.g. radomes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a method for integrally forming a C-sandwich flat radome. The method comprises the following steps: (1) preparing a prepreg; (2) pretreating a mould; (3) paving and pasting an outer skin; (4) paving and pasting honeycomb and middle skin; (5) paving and pasting the honeycomb and the inner skin; (6) curing; (7) demolding; (8) and (4) machining holes. The method for integrally forming the C-sandwich radome is simple, a mixed material of glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin is used as a prepreg, aramid paper honeycomb and a homogeneous system adhesive film are used as main raw materials, a pre-compaction step is added after the skins are laid and attached, so that bubbles among the prepregs are removed completely, the resins are fused more fully, after three layers of skins and two layers of honeycombs are laid and attached, the prepregs are cured, the thermal expansion coefficients of the prepregs are consistent, the stress is small in the curing process, and the flatness of the flat radome can be guaranteed; the method has less operation steps, can reduce the use of the autoclave, further reduce the energy consumption and reduce the production cost.
Description
Technical Field
The invention relates to the technical field of radar antenna covers, in particular to a method for integrally forming a C-sandwich flat plate antenna cover.
Background
The antenna housing is a window of electromagnetic waves and has the functions of protecting the antenna and preventing the environment from influencing and interfering the working state of the radar antenna, thereby reducing the power for driving the antenna to operate, improving the working reliability of the antenna and ensuring the all-weather operation of the radar antenna. The sandwich structure is a form widely adopted by the antenna housing, has wide and mature application in aviation and aviation, and has the characteristics of high specific strength, high specific stiffness and high energy absorption capacity.
The sandwich structure radome is provided with an A-type sandwich and a C-type sandwich, and for a large flat sandwich radome, the forming modes comprise glue joint, co-curing and the like, and in order to solve the problem of flatness, the glue joint forming mode is generally selected for integral forming. The skin is required to be formed in advance during glue joint forming, and meanwhile, if a product with a more complex shape is encountered, a plurality of sets of dies are required to be opened, so that the tank feeding times are increased, and the cost is greatly increased.
Disclosure of Invention
The invention aims to provide a simple method for integrally forming a C-sandwich radome.
The invention is realized by the following technical scheme:
a method for integrally forming a C-sandwich flat radome comprises the following steps:
(1) preparing a prepreg: manufacturing a blanking drawing of a skin laying layer, and cutting a prepreg sheet according to the blanking drawing;
(2) pretreatment of a mold: cleaning the mold, confirming that the molding surface of the mold is not damaged, and spraying a release agent on the mold;
(3) paving and pasting an outer skin: paving prepreg sheets of the outer skin on the die, connecting the prepreg sheets in a lap joint mode, and pre-compacting after paving;
(4) paving and pasting honeycomb and middle skin: paving and sticking a layer of adhesive film on the outer skin and compacting the adhesive film, paving and sticking honeycombs on the adhesive film, connecting the honeycombs in a splicing mode, filling the adhesive film or the foaming adhesive into splicing seams, and continuously paving and sticking a layer of adhesive film on the honeycombs and compacting the adhesive film; then, paving and pasting prepreg sheets of the middle skin on the adhesive film, connecting the prepreg sheets in an overlapping mode, and pre-compacting after paving and pasting are finished;
(5) paving a honeycomb and an inner skin: paving and pasting a layer of adhesive film on the middle skin and compacting the adhesive film, paving and pasting honeycombs on the adhesive film, connecting the honeycombs in a splicing mode, filling the adhesive film or foaming adhesive into splicing seams, enabling the splicing seams of the two layers of honeycombs not to be on the same line, and continuously paving and pasting a layer of adhesive film on the honeycombs and compacting the adhesive film; then, paving prepreg sheets of the inner skin on the adhesive film, connecting the prepreg sheets in an overlapping mode, and pre-compacting after paving;
(6) and (3) curing: placing the paved product in an autoclave for curing;
(7) demolding: after the curing is finished, demolding the product;
(8) machining holes: and (3) cutting edges on a numerical control machine tool to form holes after the product is demoulded, and thus obtaining the C-sandwich flat radome. By the method for integrally forming the C-sandwich radome, the manufactured large-sized flat C-sandwich radome is formed in one step, the operation steps are few, the use of an autoclave can be reduced, the energy consumption is further reduced, and meanwhile, only one mold is needed, so that the production cost is greatly reduced. The C-sandwich flat radome is formed by paving and pre-compacting the outer skin, paving and pre-compacting the adhesive film, the aramid fiber paper honeycomb, the adhesive film and the middle skin, pre-compacting the adhesive film, the aramid fiber paper honeycomb, the adhesive film and the inner skin, and finally integrally placing the radome in a vacuum bag to be cured according to a curing curve, wherein the outer surface of the radome outer skin is a mold surface, and the flatness and the smoothness of the outer surface are ensured.
Further, step (1) prepreg preparation: manufacturing a blanking drawing of the skin laying layer through a CPD module of Catia software, and then cutting a prepreg sheet by using an automatic blanking machine according to the blanking drawing.
Further, the prepreg is a mixed material of glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin.
Further, step (2) mold pretreatment: cleaning the mold with gasoline, cleaning with acetone for 2-3 times, determining that the molding surface of the mold is not damaged, and finally determining to scribe lines, wherein a release agent needs to be sprayed on the mold before each use.
Further, before each use, a loctite 770-NC release agent is sprayed on the mold, a new mold is sprayed for 8-10 times, the used mold is sprayed for 3-5 times, and the interval between every two spraying is 10-15 minutes, so that the release agent sprayed last time is ensured to be sprayed again after being cured and dried.
Further, paving an outer skin in the step (3): laying a prepreg sheet of an outer skin on a mould, wherein the laying angle is laid according to the design, the prepreg sheets are connected in a lap joint manner, the lap joint length is 5-10 mm, and the prepreg sheet of the outer skin is a glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin laminated plate; after paving, placing the mould and the paving material into a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 60-100 ℃, the pre-compaction time is 90-120 minutes, and the pre-compaction pressure is 0.3-0.6 MPa. Specifically, the outer skin prepreg sheet is any one of a glass fiber/epoxy resin laminate, a glass fiber/cyanate resin laminate, a glass fiber/bismaleimide resin laminate, a quartz fiber/epoxy resin laminate, a quartz fiber/cyanate resin laminate, and a quartz fiber/bismaleimide resin laminate.
Further, paving and pasting the honeycomb and the middle skin in the step (4): paving a layer of adhesive film on the outer skin, adopting a lap joint connection mode between the adhesive films, and vacuumizing and compacting after lap joint; paving aramid fiber paper honeycombs on the glue film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling the glue film or foaming glue into a splicing seam, continuously paving a layer of glue film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then laying a prepreg sheet of a middle skin on the adhesive film, wherein the laying angle is laid according to the design, the prepreg sheets are connected in an overlapping manner, the overlapping length is 5-10 mm, and the prepreg sheet of the middle skin is a glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin laminated plate; after the paving and pasting are finished, the cloth is placed in a vacuum bag and is put into an autoclave for pre-compaction, the pre-compaction temperature is 60-100 ℃, the pre-compaction time is 90-120 minutes, and the pre-compaction pressure is 0.2-0.5 MPa. Specifically, the middle skin prepreg sheet is any one of a glass fiber/epoxy resin laminate, a glass fiber/cyanate resin laminate, a glass fiber/bismaleimide resin laminate, a quartz fiber/epoxy resin laminate, a quartz fiber/cyanate resin laminate, and a quartz fiber/bismaleimide resin laminate.
Further, paving the honeycomb and the inner skin in the step (5): paving a layer of adhesive film on the middle skin, adopting a lap joint connection mode between the adhesive films, vacuumizing and compacting after lap joint, paving aramid fiber paper honeycombs on the adhesive film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling the adhesive film or foaming adhesive into splicing seams, enabling the splicing seams of the two layers of aramid fiber paper honeycombs not to be on the same line, continuously paving a layer of adhesive film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then laying a prepreg sheet of an inner skin on the adhesive film, wherein the laying angle is laid according to the design, the prepreg sheets are connected in a lap joint manner, the lap joint length is 5-10 mm, and the prepreg sheet of the inner skin is a glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin laminated plate; after the paving and pasting are finished, the cloth is placed in a vacuum bag and is put into an autoclave for pre-compaction, the pre-compaction temperature is 60-100 ℃, the pre-compaction time is 90-120 minutes, and the pre-compaction pressure is 0.2-0.5 MPa. Specifically, the inner skin prepreg sheet is any one of a glass fiber/epoxy resin laminate, a glass fiber/cyanate resin laminate, a glass fiber/bismaleimide resin laminate, a quartz fiber/epoxy resin laminate, a quartz fiber/cyanate resin laminate, and a quartz fiber/bismaleimide resin laminate.
Further, the step (6) is to solidify: and (4) placing the paved mould in a vacuum bag, and then placing the vacuum bag into an autoclave for curing according to a curing curve. The curve is the relationship curve of temperature and time, the pressurization time point and the pressure maintaining time.
Further, step (7) demolding: after solidification, opening the autoclave after the temperature of the product is reduced to 50-60 ℃, and cooling the mold to room temperature to demould the product.
The invention has the beneficial effects that:
(1) the method for integrally forming the C-sandwich radome comprises the steps of taking a mixed material of glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin as a prepreg, taking aramid paper honeycomb and a homogeneous system adhesive film as main raw materials, adding a pre-compaction step after the skins are laid and attached, ensuring that bubbles among the prepreg are completely removed, enabling the resin to be more fully fused, after three layers of skins and two layers of honeycombs are laid and attached, manufacturing a vacuum bag, filling the vacuum bag into a tank, curing, enabling the thermal expansion coefficients of the prepreg to be consistent, enabling the stress to be small in the curing process, and ensuring the flatness of the flat radome.
(2) The method for integrally forming the C-shaped sandwich radome is simple, and the prepared large-scale flat C-shaped sandwich radome has good flatness; according to the method for integrally forming the C-sandwich radome, the prepared large-sized flat C-sandwich radome is formed in one step, the operation steps are few, the use of an autoclave can be reduced, the energy consumption is further reduced, and meanwhile, only one mold is needed, so that the production cost is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a structural diagram of a large-sized flat C-shaped sandwich radome prepared by the method for integrally forming the C-shaped sandwich radome of the invention;
fig. 2 is a process flow diagram of the forming process of the sandwich radome structure C in the invention.
In the figure: 1 outer skin, 2 middle skins, 3 inner skins and 4 aramid fiber paper honeycombs.
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
A method for integrally forming a C-sandwich flat radome comprises the following steps:
(1) preparing a prepreg: manufacturing a blanking drawing of a skin laying layer through a CPD module of Catia software, and then cutting a prepreg sheet by using an automatic blanking machine according to the blanking drawing; the prepreg is a mixed material of glass fiber or quartz fiber and epoxy resin or cyanic acid resin or bismaleimide resin;
(2) pretreatment of a mold: cleaning a mould with gasoline, cleaning with acetone for 3 times, removing an oil seal of the mould, then confirming that a forming surface of the mould is not damaged, and finally confirming a scribed line, wherein before each use, a loctite 770-NC mould release agent needs to be sprayed on the mould (8-10 times of spraying of a new mould, 3-5 times of spraying of the used mould, 10-15 minutes of spraying interval for each time, and the mould release agent sprayed at the last time is ensured to be cured and dried and then sprayed for the next time);
(3) paving and pasting an outer skin: then laying prepreg sheets of the outer skin on the die, wherein the laying angle is laid according to the design, the prepreg sheets are connected in a lap joint mode, the lap joint length is 5 mm, and the prepreg sheets of the outer skin are glass fiber/epoxy resin laminated plates; after paving, placing the mould and the paved glass fiber/epoxy resin laminated plate in a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 60 ℃, the pre-compaction time is 90 minutes, and the pre-compaction pressure is 0.3 MPa;
(4) paving and pasting honeycomb and middle skin: paving a layer of adhesive film on the outer skin, adopting a lap joint connection mode between the adhesive films, and vacuumizing and compacting after lap joint; paving aramid fiber paper honeycombs on the glue film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling the glue film into a splicing seam, then continuously paving a layer of glue film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then paving a prepreg sheet of the middle skin on the adhesive film, wherein the paving angle is paved according to the design, the prepreg sheets are connected in a lap joint mode, the lap joint length is 5 mm, and the prepreg sheet of the middle skin is a glass fiber/epoxy resin laminated plate; after paving, placing the mould and the paved glass fiber/epoxy resin laminated plate in a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 60 ℃, the pre-compaction time is 100 minutes, and the pre-compaction pressure is 0.5 MPa;
(5) paving a honeycomb and an inner skin: paving a layer of adhesive film on the middle skin, adopting a lap joint connection mode between the adhesive films, vacuumizing and compacting after lap joint, paving aramid fiber paper honeycombs on the adhesive film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling the adhesive film at a splicing seam, keeping the splicing seams of the two layers of aramid fiber paper honeycombs out of line, continuously paving a layer of adhesive film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then laying a prepreg sheet of an inner skin on the adhesive film, wherein the laying angle is laid according to the design, the prepreg sheets are connected in a lap joint mode, the lap joint length is 5 mm, and the prepreg sheet of the inner skin is a glass fiber/epoxy resin laminated plate; after paving, placing the mould and the paved glass fiber/epoxy resin laminated plate in a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 60 ℃, the pre-compaction time is 90 minutes, and the pre-compaction pressure is 0.2 MPa;
(6) and (3) curing: placing the paved mould in a vacuum bag, and then placing the vacuum bag in an autoclave for curing according to a curing curve;
(7) demolding: after solidification, opening the autoclave after the temperature of the product is reduced to 60 ℃, and cooling the mold to room temperature to demould the product;
(8) machining holes: after demoulding, cutting edges and making holes on a numerical control machine tool to obtain the C-sandwich flat radome shown in the figure 1, and then sealing the edges, inspecting and delivering; in the figure, 1 is an outer skin, 2 is a middle skin, 3 is an inner skin, and 4 is an aramid paper honeycomb.
Example 2
A method for integrally forming a C-sandwich flat radome comprises the following steps:
(1) preparing a prepreg: manufacturing a blanking drawing of a skin laying layer through a CPD module of Catia software, and then cutting a prepreg sheet by using an automatic blanking machine according to the blanking drawing; the prepreg is a mixed material of glass fiber or quartz fiber and epoxy resin or cyanic acid resin or bismaleimide resin;
(2) pretreatment of a mold: cleaning a mould with gasoline, cleaning with acetone for 2 times, removing an oil seal of the mould, then confirming that a forming surface of the mould is not damaged, and finally confirming a scribed line, wherein before each use, a loctite 770-NC mould release agent needs to be sprayed on the mould (8-10 times of spraying of a new mould, 3-5 times of spraying of the used mould, 10-15 minutes of spraying interval for each time, and the mould release agent sprayed at the last time is ensured to be cured and dried and then sprayed for the next time);
(3) paving and pasting an outer skin: then laying a prepreg sheet of the outer skin on a mould, wherein the laying angle is laid according to the design, the prepreg sheets are connected in an overlapping manner, the overlapping length is 8 mm, and the prepreg sheet of the outer skin is a glass fiber/cyanate resin laminated plate; after paving, placing the mould and the paved glass fiber/cyanate resin laminated plate into a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 80 ℃, the pre-compaction time is 120 minutes, and the pre-compaction pressure is 0.6 MPa;
(4) paving and pasting honeycomb and middle skin: paving a layer of adhesive film on the outer skin, adopting a lap joint connection mode between the adhesive films, and vacuumizing and compacting after lap joint; paving aramid fiber paper honeycombs on the glue film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling foaming glue into splicing seams, then continuously paving a layer of glue film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then paving a prepreg sheet of the middle skin on the adhesive film, wherein the paving angle is paved according to the design, the prepreg sheets are connected in an overlapping manner, the overlapping length is 8 mm, and the prepreg sheet of the middle skin is a glass fiber/cyanate resin laminated plate; after paving, placing the mould and the paved glass fiber/cyanate resin laminated plate into a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 80 ℃, the pre-compaction time is 120 minutes, and the pre-compaction pressure is 0.4 MPa;
(5) paving a honeycomb and an inner skin: paving a layer of adhesive film on the middle skin, adopting a lap joint connection mode between the adhesive films, vacuumizing and compacting after lap joint, paving aramid fiber paper honeycombs on the adhesive film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling foaming adhesive into splicing seams, keeping the splicing seams of the two layers of aramid fiber paper honeycombs out of line, continuously paving a layer of adhesive film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then laying a prepreg sheet with an inner skin on the adhesive film, wherein the laying angle is laid according to the design, the prepreg sheets are connected in an overlapping manner, the overlapping length is 8 mm, and the inner skin prepreg sheet is a glass fiber/cyanate resin laminated plate; after paving, placing the mould and the paved glass fiber/cyanate resin laminated plate into a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 80 ℃, the pre-compaction time is 120 minutes, and the pre-compaction pressure is 0.3 MPa;
(6) and (3) curing: placing the paved mould in a vacuum bag, and then placing the vacuum bag in an autoclave for curing according to a curing curve;
(7) demolding: after solidification, opening the autoclave after the temperature of the product is reduced to 50 ℃, and cooling the mold to room temperature to demould the product;
(8) machining holes: and (3) cutting edges and making holes on a numerical control machine tool after demoulding of the product to obtain the C-sandwich flat radome shown in the figure 1, and then sealing the edges, inspecting and delivering.
Example 3
A method for integrally forming a C-sandwich flat radome comprises the following steps:
(1) preparing a prepreg: manufacturing a blanking drawing of a skin laying layer through a CPD module of Catia software, and then cutting a prepreg sheet by using an automatic blanking machine according to the blanking drawing; the prepreg is a mixed material of glass fiber or quartz fiber and epoxy resin or cyanic acid resin or bismaleimide resin;
(2) pretreatment of a mold: cleaning a mould with gasoline, cleaning with acetone for 3 times, removing an oil seal of the mould, then confirming that a forming surface of the mould is not damaged, and finally confirming a scribed line, wherein before each use, a loctite 770-NC mould release agent needs to be sprayed on the mould (a new mould is sprayed for 5-10 times, the used mould is sprayed for 3-5 times, the spraying interval is 10-15 minutes each time, and the mould release agent sprayed at the last time is ensured to be cured and dried and then sprayed for the next time);
(3) paving and pasting an outer skin: then laying prepreg sheets of the outer skin on the die, wherein the laying angle is laid according to the design, the prepreg sheets are connected in a lap joint mode, the lap joint length is 10 mm, and the prepreg sheets of the outer skin are quartz fiber/bismaleimide resin laminated plates; after paving, placing the mould and the paved quartz fiber/bismaleimide resin laminated plate in a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction at the pre-compaction temperature of 100 ℃, the pre-compaction time of 100 minutes and the pre-compaction pressure of 0.5 MPa;
(4) paving and pasting honeycomb and middle skin: paving a layer of adhesive film on the outer skin, adopting a lap joint connection mode between the adhesive films, and vacuumizing and compacting after lap joint; paving aramid fiber paper honeycombs on the glue film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling the glue film into a splicing seam, then continuously paving a layer of glue film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then paving a prepreg sheet of the middle skin on the adhesive film, wherein the paving angle is paved according to the design, the prepreg sheets are connected in a lap joint mode, the lap joint length is 10 mm, and the prepreg sheet of the middle skin is a quartz fiber/bismaleimide resin laminated plate; after paving, placing the mould and the paved quartz fiber/bismaleimide resin laminated plate in a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 100 ℃, the pre-compaction time is 90 minutes, and the pre-compaction pressure is 0.2 MPa;
(5) paving a honeycomb and an inner skin: paving a layer of adhesive film on the middle skin, adopting a lap joint connection mode between the adhesive films, vacuumizing and compacting after lap joint, paving aramid fiber paper honeycombs on the adhesive film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling the adhesive film at a splicing seam, keeping the splicing seams of the two layers of aramid fiber paper honeycombs out of line, continuously paving a layer of adhesive film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then laying a prepreg sheet of an inner skin on the adhesive film, wherein the laying angle is laid according to the design, the prepreg sheets are connected in a lap joint mode, the lap joint length is 10 mm, and the prepreg sheet of the inner skin is a quartz fiber/bismaleimide resin laminated plate; after paving, placing the mould and the paved quartz fiber/bismaleimide resin laminated plate in a vacuum bag and putting the vacuum bag into an autoclave for pre-compaction, wherein the pre-compaction temperature is 80 ℃, the pre-compaction time is 110 minutes, and the pre-compaction pressure is 0.5 MPa;
(6) and (3) curing: placing the paved mould in a vacuum bag, and then placing the vacuum bag in an autoclave for curing according to a curing curve;
(7) demolding: after solidification, opening the autoclave after the temperature of the product is reduced to 55 ℃, and cooling the mold to room temperature to demold the product;
(8) machining holes: and (3) cutting edges and making holes on a numerical control machine tool after demoulding of the product to obtain the C-sandwich flat radome shown in the figure 1, and then sealing the edges, inspecting and delivering.
The process flow of the molding process of the C-core flat radome of the above embodiments 1-3 is shown in fig. 2.
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 (10)
1. A method for integrally forming a C-sandwich flat radome is characterized by comprising the following steps:
(1) preparing a prepreg: manufacturing a blanking drawing of a skin laying layer, and cutting a prepreg sheet according to the blanking drawing;
(2) pretreatment of a mold: cleaning the mold, confirming that the molding surface of the mold is not damaged, and spraying a release agent on the mold;
(3) paving and pasting an outer skin: paving prepreg sheets of the outer skin on the die, connecting the prepreg sheets in a lap joint mode, and pre-compacting after paving;
(4) paving and pasting honeycomb and middle skin: paving and sticking a layer of adhesive film on the outer skin and compacting the adhesive film, paving and sticking honeycombs on the adhesive film, connecting the honeycombs in a splicing mode, filling the adhesive film or the foaming adhesive into splicing seams, and continuously paving and sticking a layer of adhesive film on the honeycombs and compacting the adhesive film; then, paving and pasting prepreg sheets of the middle skin on the adhesive film, connecting the prepreg sheets in an overlapping mode, and pre-compacting after paving and pasting are finished;
(5) paving a honeycomb and an inner skin: paving and pasting a layer of adhesive film on the middle skin and compacting the adhesive film, paving and pasting honeycombs on the adhesive film, connecting the honeycombs in a splicing mode, filling the adhesive film or foaming adhesive into splicing seams, enabling the splicing seams of the two layers of honeycombs not to be on the same line, and continuously paving and pasting a layer of adhesive film on the honeycombs and compacting the adhesive film; then, paving prepreg sheets of the inner skin on the adhesive film, connecting the prepreg sheets in an overlapping mode, and pre-compacting after paving;
(6) and (3) curing: placing the paved product in an autoclave for curing;
(7) demolding: after the curing is finished, demolding the product;
(8) machining holes: and (3) cutting edges on a numerical control machine tool to form holes after the product is demoulded, and thus obtaining the C-sandwich flat radome.
2. The method for integrally forming the C-core flat radome according to claim 1, wherein the prepreg preparation in the step (1): manufacturing a blanking drawing of the skin laying layer through a CPD module of Catia software, and then cutting a prepreg sheet by using an automatic blanking machine according to the blanking drawing.
3. The method for integrally forming the C-core flat radome of claim 2, wherein the prepreg is a mixed material of glass fiber or quartz fiber and epoxy resin or cyanic acid resin or bismaleimide resin.
4. The method for integrally forming the C-core flat radome according to claim 1, wherein the step (2) of mold pretreatment: the mould is cleaned by gasoline and acetone for 2-3 times, then the mould surface is not damaged, and before use, the mould is sprayed with a release agent.
5. The method for integrally forming the C-core flat radome, according to claim 4, wherein before use, a loctite 770-NC release agent is sprayed on the mold, a new mold is sprayed 8-10 times, and a used mold is sprayed 3-5 times, wherein the spraying interval is 10-15min each time.
6. The method for integrally forming the C-core flat radome according to claim 1, wherein the step (3) of paving the outer skin comprises the following steps: laying prepreg sheets of an outer skin on a mould, wherein the prepreg sheets are connected in an overlapping manner, the overlapping length is 5-10 mm, and the prepreg sheets of the outer skin are glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin laminated plates; after the paving and pasting are finished, the cloth is placed in a vacuum bag and is put into an autoclave for pre-compaction, the pre-compaction temperature is 60-100 ℃, the pre-compaction time is 90-120 minutes, and the pre-compaction pressure is 0.3-0.6 MPa.
7. The method for integrally forming the C-core flat radome according to claim 1, wherein the step (4) of paving the honeycomb and the middle skin: paving a layer of adhesive film on the outer skin, adopting a lap joint connection mode between the adhesive films, and vacuumizing and compacting after lap joint; paving aramid fiber paper honeycombs on the glue film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling the glue film or foaming glue into a splicing seam, continuously paving a layer of glue film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then laying a prepreg sheet of a middle skin on the adhesive film, wherein the prepreg sheets are connected in an overlapping manner, the overlapping length is 5-10 mm, and the prepreg sheet of the middle skin is a glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin laminated plate; after the paving and pasting are finished, the cloth is placed in a vacuum bag and is put into an autoclave for pre-compaction, the pre-compaction temperature is 60-100 ℃, the pre-compaction time is 90-120 minutes, and the pre-compaction pressure is 0.2-0.5 MPa.
8. The method for integrally forming the C-core flat radome according to claim 1, wherein the step (5) of paving the honeycomb and the inner skin: paving a layer of adhesive film on the middle skin, adopting a lap joint connection mode between the adhesive films, vacuumizing and compacting after lap joint, paving aramid fiber paper honeycombs on the adhesive film after compaction, connecting the aramid fiber paper honeycombs in a splicing mode, filling the adhesive film or foaming adhesive into splicing seams, enabling the splicing seams of the two layers of aramid fiber paper honeycombs not to be on the same line, continuously paving a layer of adhesive film on the aramid fiber paper honeycombs, and vacuumizing and compacting; then laying a prepreg sheet with an inner skin on the adhesive film, wherein the prepreg sheet is connected in an overlapping manner, the overlapping length is 5-10 mm, and the inner skin prepreg sheet is a glass fiber or quartz fiber and epoxy resin or cyanate resin or bismaleimide resin laminated plate; after the paving and pasting are finished, the cloth is placed in a vacuum bag and is put into an autoclave for pre-compaction, the pre-compaction temperature is 60-100 ℃, the pre-compaction time is 90-120 minutes, and the pre-compaction pressure is 0.2-0.5 MPa.
9. The method for integrally forming the C-core flat radome according to claim 1, wherein the step (6) of curing: and (4) placing the paved mould in a vacuum bag, and then placing the vacuum bag into an autoclave for curing according to a curing curve.
10. The method for integrally forming the C-core flat radome according to claim 1, wherein the step (7) of demolding: after solidification, opening the autoclave after the temperature of the product is reduced to 50-60 ℃, and cooling the mold to room temperature to demould the product.
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