CN112248494A - Method for molding multi-embedded-part sandwich antenna housing - Google Patents

Method for molding multi-embedded-part sandwich antenna housing Download PDF

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Publication number
CN112248494A
CN112248494A CN202010933756.7A CN202010933756A CN112248494A CN 112248494 A CN112248494 A CN 112248494A CN 202010933756 A CN202010933756 A CN 202010933756A CN 112248494 A CN112248494 A CN 112248494A
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China
Prior art keywords
embedded
sandwich
skin
curing
forming
Prior art date
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Granted
Application number
CN202010933756.7A
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Chinese (zh)
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CN112248494B (en
Inventor
张�林
张彬
张兰
韩晴
朱士强
张月东
李俊
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Jiangsu Hangyu Aviation Equipment Manufacturing Co ltd
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Jiangsu Hangyu Aviation Equipment Manufacturing Co ltd
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Priority to CN202010933756.7A priority Critical patent/CN112248494B/en
Publication of CN112248494A publication Critical patent/CN112248494A/en
Application granted granted Critical
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D25/00Producing frameless domes
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/42Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/422Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/42Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/422Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • H01Q1/424Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material comprising a layer of expanded material

Abstract

The invention discloses a method for molding a multi-embedded part sandwich radome, which comprises the following steps of 1) blanking prepreg; step 2), preparing a mould; step 3), forming an outer skin; step 4), gluing; step 5), forming an inner skin; step 6), demolding; according to the invention, the cantilever type positioning tool is adopted, so that a plurality of embedded parts in the radome sandwich structure can be accurately positioned at one time, and interchangeability is realized for different batches; but swing joint about locating plate and the mould ensures that aramid fiber paper honeycomb or foam can bear pressure below the locating plate in the curing process, makes the size of built-in fitting more accurate.

Description

Method for molding multi-embedded-part sandwich antenna housing
Technical Field
The invention relates to a method for forming an antenna housing, in particular to a method for forming a multi-embedded-part sandwich antenna housing.
Background
The sandwich structure is a form widely adopted by the radome, 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 radome 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.
At present, the radar antenna cover is mostly of honeycomb sandwich and foam sandwich, assembly holes are formed around the radar antenna cover, if the assembly holes are formed in the position of a solid skin, the assembly holes can be machined by a follow-up machine, if the assembly holes are formed in the honeycomb (foam) sandwich of the radar cover, embedded parts need to be embedded in the honeycomb (foam) sandwich in advance, the problem that the sandwich structure shrinks after solidification exists, and after shrinkage, the size precision of the embedded parts cannot be guaranteed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for molding a multi-embedded-part sandwich radome, which can accurately position a plurality of embedded parts in a sandwich layer of the radome at one time so as to enable the sizes of the embedded parts to be more accurate.
The purpose of the invention is realized as follows: a method for molding a multi-embedded-part sandwich radome is characterized by comprising the following steps:
step 1) prepreg blanking: manufacturing a blanking drawing of a skin sandwich structure laying layer through a CPD module of Catia software, and cutting a material sheet by using an automatic blanking machine;
step 2) preparing a mould: removing the oil seal of the new die, confirming that the molded surface and the scribed line of the die are intact, and coating a release agent on the die before each use;
step 3), forming an outer skin: paving n layers of prepreg on the die, wherein the prepreg is connected in an overlapping manner, and the overlapping is 5-10 mm; after the paving is finished, manufacturing a vacuum bag, and putting the vacuum bag into an autoclave for curing according to a curing curve;
step 4) gluing: after the skin is formed, cleaning the surface of the outer skin to be glued by using acetone, and pasting a layer of glue film on the skin; placing sandwich layers according to the designated area, splicing the sandwich layers in a butt joint mode, and filling equal-height foaming glue into splicing seams; removing a sandwich layer at the embedded part by using a hole opener, placing the embedded part in the sandwich layer, and determining the position of the embedded part by using a cantilever type positioning tool; making a vacuum bag, putting the vacuum bag into an autoclave, and curing according to a curing curve;
step 5), forming an inner skin: after the tank is taken out, spreading an adhesive film and an inner skin on the sandwich layer, placing barrier strips around the mold, manufacturing a vacuum bag, and placing the vacuum bag into an autoclave for curing according to a curing curve;
step 6), demolding: after the curing process is finished, demolding to obtain the multi-embedded-part sandwich antenna housing after the temperature of the mold is reduced to below 60 ℃.
As a further limitation of the invention, the step 2) of applying the release agent to the mold before each use includes wiping 8-10 times of the new mold and wiping 3 times of the used mold, wherein each time interval is 15 min.
As a further limitation of the invention, the step 4) of determining the position of the embedded part by using the cantilever type positioning tool specifically includes adding a barrier strip at the edge of the mold, forming a hole on the barrier strip, placing a positioning plate on the barrier strip and movably connecting the positioning plate with the mold up and down through a positioning pin, forming a fixing hole on the positioning plate, and connecting the positioning pin with the embedded part through the positioning hole to determine the position of the embedded part.
As a further limitation of the present invention, a glass fiber prepreg is used as the prepreg.
As a further limitation of the invention, the sandwich layer material is aramid paper honeycomb or foam.
Compared with the prior art, the technical scheme adopted by the invention has the beneficial effects that: by adopting the cantilever type positioning tool, a plurality of embedded parts in the radome sandwich structure can be accurately positioned at one time, and interchangeability is realized among different batches; but swing joint about locating plate and the mould ensures that aramid fiber paper honeycomb or foam can bear pressure below the locating plate in the curing process, makes the size of built-in fitting more accurate.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a schematic diagram of a cantilever positioning tool according to the present invention.
Fig. 3 is a cross-sectional view of the cantilever type positioning tool of the present invention.
The positioning device comprises a positioning plate 1, a first positioning pin 2, a second positioning pin 3, a positioning hole 4, an embedded part 5 and a barrier strip 6.
Detailed Description
The method for forming the multi-embedded-part sandwich radome shown in fig. 1 comprises the following steps:
step 1) prepreg blanking: manufacturing a blanking drawing of a skin sandwich structure laying layer through a CPD module of Catia software, and cutting a material sheet by using an automatic blanking machine;
step 2) preparing a mould: removing the oil seal of the new die, confirming that the molded surface and the scribed line of the die are intact, and coating a release agent on the die before each use; the new mould needs to be wiped for 8-10 times, and the used mould needs to be wiped for 3 times, wherein the interval of each time is 15 min.
Step 3), forming an outer skin: paving n layers of prepreg on the die, wherein the prepreg is glass fiber prepreg, and the prepreg is connected in an overlapping manner and is overlapped by 5-10 mm; after the paving is finished, manufacturing a vacuum bag, and putting the vacuum bag into an autoclave for curing according to a curing curve;
step 4) gluing: after the skin is formed, cleaning the surface of the outer skin to be glued by using acetone, and pasting a layer of glue film on the skin; placing aramid paper honeycombs or foams in a designated area, splicing the aramid paper honeycombs or foams in a butt joint mode, and filling equal-height foaming glue into splicing seams; removing aramid paper honeycombs or foams at the embedded part by using a hole opener, placing the embedded part in the aramid paper honeycombs or foams, determining the position of the embedded part by using a cantilever type positioning tool, adding a barrier strip at the edge of a die, forming holes on the barrier strip, placing a positioning plate on the barrier strip, and movably connecting the positioning plate and the die up and down through a positioning pin, wherein a fixing hole is formed in the positioning plate, and the positioning pin penetrates through the positioning hole to be connected with the embedded part, so that the position of the embedded part is determined; making a vacuum bag, putting the vacuum bag into an autoclave, and curing according to a curing curve;
step 5), forming an inner skin: after the aramid fiber paper honeycomb or foam is taken out of the tank, an adhesive film and an inner skin are laid on the aramid fiber paper honeycomb or foam, barrier strips are arranged around the mold to limit the movement of the honeycomb or foam, and a vacuum bag is manufactured and is placed into an autoclave to be cured according to a curing curve;
step 6), demolding: after the curing process is finished, demolding to obtain the multi-embedded-part sandwich antenna housing after the temperature of the mold is reduced to below 60 ℃.
As shown in fig. 2 to 3, the cantilever type positioning tool comprises a positioning plate 1, a first positioning pin 2 and a second positioning pin 3, wherein the positioning plate 1 is provided with a fixing hole, the first positioning pin 2 is inserted into the fixing hole and is movably connected with the forming tool up and down, the positioning plate 1 is provided with a plurality of positioning holes 4 corresponding to the embedded parts 5, the second positioning pins 3 are inserted into the positioning holes 4, the second positioning pins 3 are connected with the embedded parts 5, the positions of the positioning holes 4 and the positions of the embedded parts 5 are on the same central shaft, the embedded parts 5 formed at each time are ensured to be at the same position, and the size of the positioning plate 1 is 12mm to 16 mm; the method comprises the steps of adding a barrier strip 6 at the edge of a die, forming a hole on the barrier strip 6, placing a positioning plate 1 on the barrier strip 6, connecting the positioning plate 1 with a forming tool through a first positioning pin 2, enabling the positioning plate 1 to move up and down, ensuring that honeycomb or foam below the positioning plate 1 can bear pressure in the curing process, determining the position of an embedded part 5 according to a positioning hole 4 on the positioning plate 1, removing the honeycomb or foam where the embedded part is placed by using a hole opener, placing the embedded part 5 in the honeycomb or foam, inserting a second positioning pin 3 into the positioning hole 4 to extend and be connected with the embedded part 5, determining the position of the embedded part 5, enabling butt joints to exist in a non-embedded part positioning area without influencing use, and enabling the positioning plate 1 to be damaged and replaced in the local non-embedded part positioning.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.

Claims (5)

1. A method for molding a multi-embedded-part sandwich radome is characterized by comprising the following steps:
step 1) prepreg blanking: manufacturing a blanking drawing of a skin sandwich structure laying layer through a CPD module of Catia software, and cutting a material sheet by using an automatic blanking machine;
step 2) preparing a mould: removing the oil seal of the new die, confirming that the molded surface and the scribed line of the die are intact, and coating a release agent on the die before each use;
step 3), forming an outer skin: paving n layers of prepreg on the die, wherein the prepreg is connected in an overlapping manner, and the overlapping is 5-10 mm; after the paving is finished, manufacturing a vacuum bag, and putting the vacuum bag into an autoclave for curing according to a curing curve;
step 4) gluing: after the skin is formed, cleaning the surface of the outer skin to be glued by using acetone, and pasting a layer of glue film on the skin; placing sandwich layers according to the designated area, splicing the sandwich layers in a butt joint mode, and filling equal-height foaming glue into splicing seams; removing a sandwich layer at the embedded part by using a hole opener, placing the embedded part in the sandwich layer, and determining the position of the embedded part by using a cantilever type positioning tool; making a vacuum bag, putting the vacuum bag into an autoclave, and curing according to a curing curve;
step 5), forming an inner skin: after the tank is taken out, spreading an adhesive film and an inner skin on the sandwich layer, placing barrier strips around the mold, manufacturing a vacuum bag, and placing the vacuum bag into an autoclave for curing according to a curing curve;
step 6), demolding: after the curing process is finished, demolding to obtain the multi-embedded-part sandwich antenna housing after the temperature of the mold is reduced to below 60 ℃.
2. The method for forming the multi-embedded part sandwich radome of claim 1, wherein the step 2) of applying the release agent to the mold before each use comprises 8-10 times of wiping the new mold, and 3 times of wiping the used mold, wherein each time interval is 15 min.
3. The method for forming the multi-embedded-part sandwich radome of claim 1, wherein the step 4) of determining the position of the embedded part by using the cantilever type positioning tool specifically comprises the steps of adding a barrier strip at the edge of the mold, forming a hole on the barrier strip, placing a positioning plate on the barrier strip, movably connecting the positioning plate with the mold up and down through a positioning pin, forming a fixing hole on the positioning plate, and connecting the positioning pin with the embedded part through the positioning hole to determine the position of the embedded part.
4. The method for molding the multi-embedded part sandwich radome as claimed in claim 1, wherein the prepreg is a glass fiber prepreg.
5. The method for molding the multi-embedded-part sandwich radome as claimed in claim 1, wherein the sandwich layer material is aramid paper honeycomb or foam.
CN202010933756.7A 2020-09-08 2020-09-08 Method for molding multi-embedded-part sandwich antenna housing Active CN112248494B (en)

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Application Number Priority Date Filing Date Title
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CN112248494B CN112248494B (en) 2022-05-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102166824A (en) * 2010-12-29 2011-08-31 江西昌河航空工业有限公司 Method for positioning composite material metal insert
CN107538758A (en) * 2017-09-08 2018-01-05 陕西飞机工业(集团)有限公司 A kind of composite material connection method
CN108556237A (en) * 2018-07-05 2018-09-21 浙江杉盛模塑科技有限公司 A kind of built-in fitting and its built-in process of PU composite materials
CN108749022A (en) * 2018-04-25 2018-11-06 西安飞机工业(集团)有限责任公司 A kind of laying method of excipient composite material antenna reflector
CN110053277A (en) * 2019-04-26 2019-07-26 哈尔滨哈玻拓普复合材料有限公司 A kind of injection moulding method of foam layer radome component

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102166824A (en) * 2010-12-29 2011-08-31 江西昌河航空工业有限公司 Method for positioning composite material metal insert
CN107538758A (en) * 2017-09-08 2018-01-05 陕西飞机工业(集团)有限公司 A kind of composite material connection method
CN108749022A (en) * 2018-04-25 2018-11-06 西安飞机工业(集团)有限责任公司 A kind of laying method of excipient composite material antenna reflector
CN108556237A (en) * 2018-07-05 2018-09-21 浙江杉盛模塑科技有限公司 A kind of built-in fitting and its built-in process of PU composite materials
CN110053277A (en) * 2019-04-26 2019-07-26 哈尔滨哈玻拓普复合材料有限公司 A kind of injection moulding method of foam layer radome component

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