CN114006164A - Method for fixing wave-absorbing material in inner cavity of radar cast aluminum cover plate - Google Patents
Method for fixing wave-absorbing material in inner cavity of radar cast aluminum cover plate Download PDFInfo
- Publication number
- CN114006164A CN114006164A CN202111281532.3A CN202111281532A CN114006164A CN 114006164 A CN114006164 A CN 114006164A CN 202111281532 A CN202111281532 A CN 202111281532A CN 114006164 A CN114006164 A CN 114006164A
- Authority
- CN
- China
- Prior art keywords
- wave
- absorbing material
- cover plate
- inner cavity
- radar
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000011358 absorbing material Substances 0.000 title claims abstract description 94
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000005488 sandblasting Methods 0.000 claims abstract description 21
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 12
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 7
- 239000012459 cleaning agent Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 239000004484 Briquette Substances 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 238000005422 blasting Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 125000003158 alcohol group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
Abstract
The invention relates to the technical field of radars, in particular to a method for fixing a wave-absorbing material in an inner cavity of a radar cast aluminum cover plate, which comprises the following steps: and (3) carrying out sand blasting on the inner wall of the cast aluminum cover plate, cleaning the inner wall, pasting a wave-absorbing material on the inner wall, applying pressure on the pasted wave-absorbing material, maintaining the pressure, gluing and plugging the joint and the part, which cannot be pasted with the cover plate, of the periphery of the wave-absorbing material, and carrying out curing molding. The invention has the advantages that: the wave absorbing material in the inner cavity of the radar cast aluminum cover plate is fixed firmly, and corners are not easy to warp and fall off.
Description
Technical Field
The invention relates to the technical field of radars, in particular to a method for fixing a wave-absorbing material in an inner cavity of a radar cast aluminum cover plate.
Background
As radar electronics power, module size, increases, the complexity of the system leads to increasingly severe electromagnetic interference problems. The common metal inner cavity sealing means can not meet the requirements of telecommunication technical indexes. The conventional method is that the MCS wave-absorbing material is pressed and stuck on the inner wall of the antenna protective cover plate by fingers to enhance the inhibition effect on the resonance in the cavity, and the material has good effect on eliminating the reflection and clutter inhibition of the metal component in the cover.
In the field of radar antennas, the application of sticking wave-absorbing materials to inhibit resonance, clutter and the like is wide, for example, the Chinese utility model patent with the publication number of CN212462029U discloses a cylindrical phased array antenna, which sticks wave-absorbing materials in an annular groove; chinese utility model patent publication No. CN204809405U discloses a phased array antenna shield in which a wave-absorbing material body is bonded to the upper part of a cavity formed by a hollow metal shell; the chinese patent application with publication number CN110850379A discloses an active radar seeker assembly testing device, wherein a wave-absorbing material is adhered to the inner side surface of the housing.
However, with the enlargement of the radar antenna scale, the size of the protective cover plate is further increased, and in order to reduce the production cost and realize batch manufacturing, the protective cover plate is formed by sand casting. The process characteristics determine that the inner cavity wall has certain roughness because secondary processing cannot be carried out on the surface. When the MCS wave-absorbing material is pasted, point-to-point bonding between the back glue of the wave-absorbing material and the surface of the cover plate can be realized, the degree of pressing force of a finger is limited, uniform stress cannot be ensured, and large-area seamless bonding cannot be realized. In addition, due to the structural characteristics of the molded surface of the inner cavity of the cover plate, the wave-absorbing material is required to be cut to a proper size so as to be attached to the inner cavity surface of the cover plate as far as possible. And the small-sized wave-absorbing material is easy to fall off due to insufficient adhesive force. When a product is subjected to a reliability vibration test, the phenomena of corner warping and large-area falling of the wave-absorbing material are easily caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows:
in the prior art, the wave absorbing material in the inner cavity of the radar cast aluminum cover plate is not firmly fixed, and the corner warping and falling are easy to occur.
The invention solves the technical problems through the following technical means:
a method for fixing a wave-absorbing material in an inner cavity of a radar cast aluminum cover plate comprises the following steps:
s01, sandblasting
Carrying out sand blasting treatment on the inner wall of the cast aluminum cover plate by adopting fine sand of 100-200 meshes, wherein the sand blasting treatment time is 10-30 min;
s02, cleaning
After sand blasting, cleaning the surface of the inner cavity of the cover plate by using a cleaning agent until no oil stain, no sand grains and no fingerprint exist;
s03, pasting
Cutting the wave-absorbing material according to the shape of the molded surface of the inner cavity, tearing off a back film of the wave-absorbing material, naturally spreading the wave-absorbing material and sticking the wave-absorbing material on the surface of the inner cavity of the cover plate, avoiding lap joint, and preventing the wave-absorbing material from protruding out of the mounting surface of the inner cavity of the cover plate after sticking;
s04 pressure maintaining
Applying pressure on the adhered wave-absorbing material, and maintaining the pressure for more than 1 h;
s05, gluing
And gluing and plugging a gap between the two pieces of wave-absorbing materials and the part, which cannot be attached to the cover plate, of the periphery of the wave-absorbing materials, and curing for 15-30h for molding.
The four sides of the wave-absorbing material are blocked by gluing, so that the wave-absorbing material warping phenomenon in the vibration test process is effectively inhibited, and the wave-absorbing material is prevented from being loosened and torn due to local adhesion. In addition, the inner cavity surface of the cast aluminum cover plate is subjected to sand blasting, the effective pasting area of the wave-absorbing material is increased, and the binding force of the wave-absorbing material is effectively enhanced through pressure maintaining operation. The wave-absorbing material fixed by the method has the capability of bearing no looseness and no falling for more than 100h in a GJB150.16 durable vibration test. Compared with the prior art, the wave absorbing material in the inner cavity of the radar cast aluminum cover plate is fixed firmly, and corners are not easy to warp and fall off.
Preferably, in step S01, 150 mesh fine sand is used for sand blasting.
Optimally, the duration of the sand blasting in the step S01 is 20 min.
Preferably, in step S02, the cleaning agent is alcohol.
Preferably, in step S04, a pressing block is placed on the adhered wave-absorbing material for pressing.
Preferably, the weight of the briquette is 2-5 kg.
Optimally, the bottom surface of the pressing block is attached to the surface of the attached wave-absorbing material.
Optimally, in step S04, the dwell time is 1.5 h.
Optimally, the wave-absorbing material is an MCS wave-absorbing material.
Preferably, in step S05, glue 703 is used for gluing.
The invention has the advantages that:
the four sides of the wave-absorbing material are blocked by gluing, so that the wave-absorbing material warping phenomenon in the vibration test process is effectively inhibited, and the wave-absorbing material is prevented from being loosened and torn due to local adhesion. In addition, the inner cavity surface of the cast aluminum cover plate is subjected to sand blasting, the effective pasting area of the wave-absorbing material is increased, and the binding force of the wave-absorbing material is effectively enhanced through pressure maintaining operation. The wave-absorbing material fixed by the method has the capability of bearing no looseness and no falling for more than 100h in a GJB150.16 durable vibration test. Compared with the prior art, the wave absorbing material in the inner cavity of the radar cast aluminum cover plate is fixed firmly, and corners are not easy to warp and fall off.
Drawings
FIG. 1 is a flow chart of a method for fixing a wave-absorbing material in an inner cavity of a radar cast aluminum cover plate in the embodiment of the invention;
FIG. 2 is a schematic diagram of pressure maintaining of briquettes in the embodiment of the present invention;
fig. 3 is a schematic diagram of a gluing process in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. 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.
The first embodiment is as follows:
as shown in fig. 1, in the present embodiment, a method for fixing a wave-absorbing material in an inner cavity of a radar cast-aluminum cover plate, where the radar cast-aluminum cover plate has a length of 2m and a width of 0.4m and is in a concave form, needs to fix a wave-absorbing material MCS-SS6M on the inner cavity wall. The method comprises the following steps:
s01, sandblasting
And (3) carrying out sand blasting treatment on the inner wall of the cast aluminum cover plate by adopting fine sand of 100 meshes, wherein the time of the sand blasting treatment is 10min, so as to refine the surface state.
S02, cleaning
After sand blasting, cleaning the surface of the inner cavity of the cover plate by using a cleaning agent until no oil stain, no sand grains and no fingerprints exist, wherein the cleaning agent is alcohol.
S03, pasting
Cutting the wave-absorbing material according to the shape of the molded surface of the inner cavity, tearing off a back film of the wave-absorbing material, paying attention to the fact that hands are strictly prohibited to directly touch the back adhesive, wearing clean plastic gloves to operate, naturally spreading and pasting the wave-absorbing material on the surface of the inner cavity of the cover plate, avoiding lap joint, enabling the width of a splicing seam to be smaller than 5mm, enabling the wave-absorbing material to be pasted flatly, and enabling the wave-absorbing material not to protrude out of the mounting surface of the inner cavity of the cover plate after the wave-absorbing material is pasted; the wave-absorbing material is MCS wave-absorbing material.
S04 pressure maintaining
As shown in fig. 2, applying pressure on the adhered wave-absorbing material, and maintaining the pressure for 1 h; specifically, a pressing block is placed on the adhered wave-absorbing material for pressing. The weight of the briquettes is 2 kg. The bottom surface of the pressing block is attached to the surface of the attached wave-absorbing material.
S05, gluing
As shown in fig. 3, a gap between two pieces of wave-absorbing materials and a part where the periphery of the wave-absorbing material cannot be attached to the cover plate are coated with glue for plugging, and the wave-absorbing material is cured for 15 hours for molding. Specifically, 703 glue is used for gluing.
As shown in fig. 3, the periphery of the wave-absorbing material is not attached to the cover plate, specifically, the protruding portion of the cover plate, such as the reinforcing rib, is referred to. Dashed lines are used in figure 3 to indicate the boundaries of the wave-absorbing material covered by glue.
Example two:
the difference between this embodiment and the first embodiment is:
in step S01, fine sand of 150 meshes is adopted, and the sand blasting time is 20 min; in the step S04, maintaining the pressure for 1.5 h; the weight of the briquettes is 3.5 kg; in step S05, the mold is cured for 24 hours.
Example three:
the difference between this embodiment and the first embodiment is:
in step S01, fine sand of 200 meshes is adopted, and the sand blasting time is 30 min; in the step S04, maintaining the pressure for 2 h; the weight of the briquettes is 5 kg; in step S05, the mold is cured for 30 hours.
The four sides of the wave-absorbing material are blocked by gluing, so that the wave-absorbing material warping phenomenon in the vibration test process is effectively inhibited, and the wave-absorbing material is prevented from being loosened and torn due to local adhesion. In addition, the inner cavity surface of the cast aluminum cover plate is subjected to sand blasting, the effective pasting area of the wave-absorbing material is increased, and the binding force of the wave-absorbing material is effectively enhanced through pressure maintaining operation. The wave-absorbing material fixed by the method has the capability of bearing no looseness and no falling for more than 100h in a GJB150.16 durable vibration test. Compared with the prior art, the wave absorbing material in the inner cavity of the radar cast aluminum cover plate is fixed firmly, and corners are not easy to warp and fall off.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for fixing wave-absorbing materials in an inner cavity of a radar cast aluminum cover plate is characterized by comprising the following steps: the method comprises the following steps:
s01, sandblasting
Carrying out sand blasting treatment on the inner wall of the cast aluminum cover plate by adopting fine sand of 100-200 meshes, wherein the sand blasting treatment time is 10-30 min;
s02, cleaning
After sand blasting, cleaning the surface of the inner cavity of the cover plate by using a cleaning agent until no oil stain, no sand grains and no fingerprint exist;
s03, pasting
Cutting the wave-absorbing material according to the shape of the molded surface of the inner cavity, tearing off a back film of the wave-absorbing material, naturally spreading the wave-absorbing material and sticking the wave-absorbing material on the surface of the inner cavity of the cover plate, avoiding lap joint, and preventing the wave-absorbing material from protruding out of the mounting surface of the inner cavity of the cover plate after sticking;
s04 pressure maintaining
Applying pressure on the adhered wave-absorbing material, and maintaining the pressure for more than 1 h;
s05, gluing
And gluing and plugging a gap between the two pieces of wave-absorbing materials and the part, which cannot be attached to the cover plate, of the periphery of the wave-absorbing materials, and curing for 15-30h for molding.
2. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 1, characterized in that: in step S01, fine sand of 150 mesh is used for sand blasting.
3. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 1, characterized in that: the blasting time period in step S01 was 20 min.
4. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 1, characterized in that: in step S02, alcohol is used as the cleaning agent.
5. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 1, characterized in that: in step S04, a pressing block is placed on the adhered wave-absorbing material for pressing.
6. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 5, wherein the method comprises the following steps: the weight of the briquette is 2-5 kg.
7. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 5, wherein the method comprises the following steps: the bottom surface of the pressing block is attached to the surface of the attached wave-absorbing material.
8. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 1, characterized in that: in step S04, the dwell time was 1.5 h.
9. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 1, characterized in that: the wave-absorbing material is MCS wave-absorbing material.
10. The method for fixing the wave-absorbing material in the inner cavity of the radar cast-aluminum cover plate according to claim 1, characterized in that: in step S05, glue is applied using 703 glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111281532.3A CN114006164A (en) | 2021-11-01 | 2021-11-01 | Method for fixing wave-absorbing material in inner cavity of radar cast aluminum cover plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111281532.3A CN114006164A (en) | 2021-11-01 | 2021-11-01 | Method for fixing wave-absorbing material in inner cavity of radar cast aluminum cover plate |
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| Publication Number | Publication Date |
|---|---|
| CN114006164A true CN114006164A (en) | 2022-02-01 |
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| CN202111281532.3A Pending CN114006164A (en) | 2021-11-01 | 2021-11-01 | Method for fixing wave-absorbing material in inner cavity of radar cast aluminum cover plate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002210961A (en) * | 2001-01-12 | 2002-07-31 | Matsushita Electric Ind Co Ltd | Fluid ejector and its manufacturing method |
| CN101259463A (en) * | 2008-04-30 | 2008-09-10 | 东北大学 | Preparation of foam aluminum alloy base wave-absorbing material |
| CN102658931A (en) * | 2012-05-22 | 2012-09-12 | 江苏瑞能防腐设备有限公司 | Large-scale chemical equipment and manufacture technology of lining anti-corrosion board of large-scale chemical equipment |
| CN111532417A (en) * | 2020-05-13 | 2020-08-14 | 北京机电工程研究所 | Aircraft radar stealth airfoil and preparation method thereof |
| CN112659662A (en) * | 2020-12-07 | 2021-04-16 | 航天特种材料及工艺技术研究所 | Wave-absorbing patch/hard substrate adhesive composite structure and preparation method thereof |
-
2021
- 2021-11-01 CN CN202111281532.3A patent/CN114006164A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002210961A (en) * | 2001-01-12 | 2002-07-31 | Matsushita Electric Ind Co Ltd | Fluid ejector and its manufacturing method |
| CN101259463A (en) * | 2008-04-30 | 2008-09-10 | 东北大学 | Preparation of foam aluminum alloy base wave-absorbing material |
| CN102658931A (en) * | 2012-05-22 | 2012-09-12 | 江苏瑞能防腐设备有限公司 | Large-scale chemical equipment and manufacture technology of lining anti-corrosion board of large-scale chemical equipment |
| CN111532417A (en) * | 2020-05-13 | 2020-08-14 | 北京机电工程研究所 | Aircraft radar stealth airfoil and preparation method thereof |
| CN112659662A (en) * | 2020-12-07 | 2021-04-16 | 航天特种材料及工艺技术研究所 | Wave-absorbing patch/hard substrate adhesive composite structure and preparation method thereof |
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