CN113858663A - Method for forming sawtooth-provided L-shaped variable cross-section hollow-structure composite wave-absorbing component - Google Patents
Method for forming sawtooth-provided L-shaped variable cross-section hollow-structure composite wave-absorbing component Download PDFInfo
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- CN113858663A CN113858663A CN202111120011.XA CN202111120011A CN113858663A CN 113858663 A CN113858663 A CN 113858663A CN 202111120011 A CN202111120011 A CN 202111120011A CN 113858663 A CN113858663 A CN 113858663A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 17
- 238000004382 potting Methods 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims abstract description 11
- 230000001070 adhesive effect Effects 0.000 claims abstract description 11
- 238000013461 design Methods 0.000 claims abstract description 10
- 238000003754 machining Methods 0.000 claims abstract description 8
- 238000003801 milling Methods 0.000 claims abstract description 5
- 230000002745 absorbent Effects 0.000 claims description 10
- 239000002250 absorbent Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000004643 cyanate ester Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- 239000000565 sealant Substances 0.000 abstract description 7
- 230000037303 wrinkles Effects 0.000 abstract description 3
- 238000002791 soaking Methods 0.000 abstract description 2
- 239000006260 foam Substances 0.000 description 5
- 239000011358 absorbing material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
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Classifications
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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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
-
- 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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/681—Component parts, details or accessories; Auxiliary operations
-
- 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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/681—Component parts, details or accessories; Auxiliary operations
- B29C70/683—Pretreatment of the preformed part, e.g. insert
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a method for forming a wave-absorbing part made of a composite material with a sawtooth L-shaped variable cross section and a hollow structure, which comprises the following steps: s1, according to the overall dimension of the product, cutting the honeycomb after reserving allowance, and cutting a honeycomb blank meeting the processing requirement; s2, preparing a wave-absorbing honeycomb blank by soaking materials; s3, machining the wave-absorbing honeycomb blank to prepare a honeycomb part blank; s4, exposing the part of the sawtooth to be processed; s5, filling low-dielectric potting adhesive at the part of the part blank where the sawteeth need to be processed; s6, paving and adhering prepreg skins by adopting a forming tool and curing; and S7, performing sawtooth processing by adopting a milling tool to prepare the product. The invention has the advantages that: the dimensional precision control of the part meets the design requirement and has good dimensional stability, the appearance quality of the molded part is good, the temperature resistance of the part is improved, and the problems that the part is easy to generate warping deformation and surface wrinkles are solved; the sawtooth part is filled and reinforced by pouring sealant, so that the sawtooth is not easy to be broken.
Description
Technical Field
The invention relates to a method for forming a wave-absorbing part made of a composite material with a sawtooth L-shaped variable cross section and a hollow structure.
Background
The radar stealth technology is an essential electronic countermeasure technology in modern war, and two main technical approaches for realizing stealth are as follows: firstly, the radar scattering cross section RCS is reduced through the shape design, and secondly, a material for absorbing radar waves is applied. With the development of science and technology, the single approach cannot meet the requirement of reducing the RCS more and more. The combined use of both the profile design and the radar wave absorbing material can improve the reduction of RCS. The use of the radar wave absorbing material can improve the stealth performance of the component on the premise of not influencing the structure, the strength and the pneumatic appearance of the component. In order to realize the way, the material for absorbing the radar waves can be attached to intermediate materials such as foam, honeycomb and the like, and then the intermediate materials are compounded with other materials to prepare the composite wave-absorbing component with integrated functions and structures. Therefore, research on the composite wave-absorbing component is rapidly developed.
In the prior art, a composite wave-absorbing component with a saw tooth L-shaped variable cross-section hollow structure is manufactured by adopting thermoplastic foam particles, soaking an absorbent, foaming and forming into a hard foam plate, and then machining the appearance of the component. The prior art has the advantages that: the manufacturing process flow is short, and the production period is short; the working procedure is simple, and the process difficulty is low; and thirdly, the foam material is adopted, so that the weight is light. The disadvantages are that: firstly, a thermoplastic material is adopted to prepare a wave-absorbing component product, so that the size stability is poor and the wave-absorbing component product is not easy to control; secondly, the overall structural strength of the product is weak, and particularly, the sawtooth part is easy to break; fine burrs are easily generated at the saw teeth and are difficult to clean; fourthly, after the plastic is foamed and molded, holes are difficult to avoid in the foam, and the holes are exposed and the appearance is not beautiful after the product is manufactured; the product has unstable temperature resistance and is easy to generate warping deformation and surface wrinkles; sixthly, the power resistance of the product does not meet the requirement.
Based on the above disadvantages of the thermoplastic rigid foam wave-absorbing material, there is a need to develop a new material and a new process to meet the technical index requirements of the product.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for forming a wave-absorbing part made of a composite material with a sawtooth L-shaped variable cross section and a hollow structure.
The purpose of the invention is realized by the following technical scheme:
a method for forming a wave-absorbing component made of a composite material with a sawtooth L-shaped variable cross section and a hollow structure comprises the following steps:
s1, according to the overall dimension of the product, the honeycomb is cut after the allowance is left, a honeycomb blank meeting the processing requirement is cut, and the blank dimension is as follows: 1400mm 1300mm 170 mm;
s2, selecting an impregnating system to impregnate the absorbent in the honeycomb according to the performance requirement, carrying out impregnating gradient design, and then preparing the impregnating into a wave-absorbing honeycomb blank;
s3, machining the wave-absorbing honeycomb blank to prepare a honeycomb part blank: firstly, processing the inner and outer molded surfaces of the L-shaped variable cross section of the part, and temporarily not processing the sawteeth;
s4, fixing the encapsulation tool on the inner and outer molded surfaces of the honeycomb part blank, and exposing the part needing to be processed with the saw teeth;
s5, filling low-dielectric potting adhesive at the part of the part blank where the sawteeth need to be processed, and polishing the upper and lower surfaces to be flush with the honeycomb after the potting adhesive is cured;
s6, paving 1-3 layers of cyanate ester quartz fiber prepreg wave-transmitting skins on the inner and outer molded surfaces of the L-shaped variable cross section of the part blank by adopting a forming tool, and curing to manufacture the part blank into a honeycomb sandwich structure;
and S7, positioning and clamping by using a milling tool through a process positioning hole, and then performing sawtooth processing on the honeycomb sandwich structure after skin covering to prepare the composite wave absorbing component with the sawtooth L-shaped variable cross-section hollow structure.
Further, in step S2, according to the performance simulation result, the absorbent with different concentrations is impregnated in a gradient manner in the thickness direction, and the absorbent concentration gradually decreases from bottom to top.
Further, in step S3, the blank of the honeycomb part is expanded inward and contracted outward by 3-5mm according to the shape of the product.
Further, in step S5, when the low dielectric potting compound is filled, the filling area is extended outward by 3-5mm from the outer contour of the saw teeth.
Further, in step S6, the forming tool is a combined mold, and the mold main body is a male mold boss, so as to ensure an inner mold surface of the L-shaped variable cross-section hollow structure; the detachable part is a partitioned female die and is connected with the die body through pin positioning and bolt fixing, and the outer profile of the L-shaped variable cross-section hollow structure is guaranteed.
Further, in step S5, the low dielectric potting adhesive can resist a temperature of more than 180 ℃ and has a dielectric constant less than 2.
Further, in step S6, the thickness of the single layer of the cyanate ester quartz fiber prepreg wave-transparent skin is 0.2 mm.
The invention has the following advantages:
1. adopting a new material and a new process: the honeycomb core and the skin are made into a honeycomb sandwich structure, the size precision control of parts meets the design requirements, and the size stability is good.
2. Adopt honeycomb sandwich structure, part overall structure intensity promotes to the sawtooth position has the pouring sealant to fill to strengthen, makes the sawtooth be difficult for being broken.
3. The honeycomb at the sawtooth position is filled with pouring sealant, the appearance quality is good after machining, post-treatment operation is not needed, and time and labor cost are saved.
4. The honeycomb core and the skin are adopted to manufacture a honeycomb sandwich structure, the inner and outer molded surfaces of the part are ensured by using the combined die, and the appearance quality of the formed part is good.
5. The honeycomb core and the skin are adopted to manufacture the honeycomb sandwich structure, so that the temperature resistance of the part is improved, and the problems that the part is easy to generate warping deformation and surface wrinkles are solved.
6. The honeycomb sandwich structure is made of the honeycomb core and the skin, so that the power resistance of the part is improved, and the power resistance requirement of the product is met.
7. And the pouring sealant is applied, so that the edge sealing treatment is finished after the sawtooth part is processed, and the edge sealing quality is good.
8. Tooling design and manufacturing, compromise the thermal expansion problem of mould and honeycomb, the scaling coefficient has been considered to the mould during design, has controlled machining error during manufacturing, has guaranteed not have the layering between shaping back covering and the honeycomb, and the bonding intensity is high.
9. During the frock design time, the detachable part of assembling die has designed spacingly, has protected the honeycomb not collapsed when the shaping, has improved the qualification rate of product.
Drawings
FIG. 1 is a schematic view of the forming process of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
As shown in fig. 1, a method for forming a wave-absorbing component made of a composite material with a sawtooth L-shaped variable cross-section hollow structure comprises the following steps:
s1, according to the overall dimension of the product, the honeycomb is cut after the allowance is left, a honeycomb blank meeting the processing requirement is cut, and the blank dimension is as follows: 1400mm 1300mm 170 mm;
s2, selecting an impregnating system to impregnate the absorbent in the honeycomb according to performance requirements, carrying out impregnating gradient design, impregnating the absorbent with different concentrations in a gradient manner in the thickness direction according to a performance simulation result, gradually decreasing the absorbent concentration from bottom to top, and then impregnating to prepare a wave-absorbing honeycomb blank;
s3, machining the wave-absorbing honeycomb blank to prepare a honeycomb part blank: firstly, processing the inner and outer molded surfaces of the L-shaped variable cross section of the part, temporarily not processing the sawteeth, and expanding the inner part and the outer part of a honeycomb part blank by 3-5mm according to the appearance of a product;
s4, fixing the encapsulation tool on the inner and outer molded surfaces of the honeycomb part blank, and exposing the part needing to be processed with the saw teeth;
s5, filling low-dielectric potting adhesive in the part blank where the sawteeth need to be processed, wherein the low-dielectric potting adhesive can resist the temperature of more than 180 ℃, has the dielectric constant of less than 2, expands 3-5mm from the outer contour of the sawteeth in the filling area, and polishes the upper surface and the lower surface to be flush with the honeycomb after the potting adhesive is solidified; after the pouring sealant is filled, the strength of the sawtooth part can be increased, the width of the sawtooth is only 7mm, and the strength is weaker; secondly, filling pouring sealant, and after sawtooth processing, edge sealing treatment on the honeycomb is not needed; filling pouring sealant, and machining to obtain the sawtooth with smooth cross section and no burr.
S6, paving and adhering 1-3 layers of cyanate ester quartz fiber prepreg wave-transmitting skins on the inner and outer molded surfaces of the L-shaped variable cross section of the part blank by adopting a molding tool, and curing, wherein the single-layer thickness of the cyanate ester quartz fiber prepreg wave-transmitting skins is 0.2mm, and the part blank is manufactured into a honeycomb sandwich structure;
and S7, positioning and clamping by using a milling tool through a process positioning hole, and then performing sawtooth processing on the honeycomb sandwich structure after skin covering to prepare the composite wave absorbing component with the sawtooth L-shaped variable cross-section hollow structure.
In this embodiment, in step S6, the forming tool is a combined mold, and the mold main body is a male mold boss, so as to ensure an inner mold surface of the L-shaped variable cross-section hollow structure; the detachable part is a partitioned female die and is connected with the die main body through pin positioning and bolt fixing to ensure the outer profile of the L-shaped variable cross-section hollow structure, so that the inner and outer profiles of the L-shaped variable cross-section of the part are attached to the die, and the surface quality of the inner and outer surfaces of the part after the part is molded can be ensured.
When the forming tool is designed and manufactured, the thermal expansion of the tool and the honeycomb is considered, the scaling coefficient (scaling is 1-3 mm) and the processing error of a male die boss of the combined die are controlled, and the fitting property of the inner skin and the honeycomb during forming is ensured.
During the frock is installed the time, and the detachable part of assembling die has designed spacingly, when guaranteeing that the honeycomb is not impaired during the shaping, also can guarantee the laminating nature of outer covering and honeycomb.
2 process positioning holes with diameter of 6mm are designed in the forming tool, and the process positioning holes are matched with the milling tool, so that the clamping and positioning during secondary processing are facilitated.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for forming a wave-absorbing component made of a composite material with a sawtooth L-shaped variable cross section and a hollow structure is characterized by comprising the following steps: the method comprises the following steps:
s1, according to the overall dimension of the product, the honeycomb is cut after the allowance is left, a honeycomb blank meeting the processing requirement is cut, and the blank dimension is as follows: 1400mm 1300mm 170 mm;
s2, selecting an impregnating system to impregnate the absorbent in the honeycomb according to the performance requirement, carrying out impregnating gradient design, and then preparing the impregnating into a wave-absorbing honeycomb blank;
s3, machining the wave-absorbing honeycomb blank to prepare a honeycomb part blank: firstly, processing the inner and outer molded surfaces of the L-shaped variable cross section of the part, and temporarily not processing the sawteeth;
s4, fixing the encapsulation tool on the inner and outer molded surfaces of the honeycomb part blank, and exposing the part needing to be processed with the saw teeth;
s5, filling low-dielectric potting adhesive at the part of the part blank where the sawteeth need to be processed, and polishing the upper and lower surfaces to be flush with the honeycomb after the potting adhesive is cured;
s6, paving 1-3 layers of cyanate ester quartz fiber prepreg wave-transmitting skins on the inner and outer molded surfaces of the L-shaped variable cross section of the part blank by adopting a forming tool, and curing to manufacture the part blank into a honeycomb sandwich structure;
and S7, positioning and clamping by using a milling tool through a process positioning hole, and then performing sawtooth processing on the honeycomb sandwich structure after skin covering to prepare the composite wave absorbing component with the sawtooth and L-shaped variable cross-section hollow structure.
2. The method for forming the wave-absorbing component of the composite material with the sawtooth L-shaped variable cross-section hollow structure according to claim 1, wherein the method comprises the following steps: in step S2, according to the performance simulation result, the absorbent with different concentrations is impregnated in 3 gradients in the thickness direction, and the absorbent concentration gradually decreases from bottom to top.
3. The method for forming the wave-absorbing component of the composite material with the sawtooth L-shaped variable cross-section hollow structure according to claim 1, wherein the method comprises the following steps: in step S3, the honeycomb part blank is expanded inwards and contracted outwards by 3-5mm according to the shape of the product.
4. The method for forming the wave-absorbing component of the composite material with the sawtooth L-shaped variable cross-section hollow structure according to claim 1, wherein the method comprises the following steps: in step S5, when filling the low dielectric potting adhesive, the filling area is extended outward by 3-5mm from the outer contour of the saw tooth.
5. The method for forming the wave-absorbing component of the composite material with the sawtooth L-shaped variable cross-section hollow structure according to claim 1, wherein the method comprises the following steps: in the step S6, the forming tool is a combined die, the main body of the die is a male die boss, and an inner molded surface of an L-shaped variable cross-section hollow structure is ensured; the detachable part is a partitioned female die and is connected with the die body through pin positioning and bolt fixing, and the outer profile of the L-shaped variable cross-section hollow structure is guaranteed.
6. The method for forming the wave-absorbing component of the composite material with the sawtooth L-shaped variable cross-section hollow structure according to claim 1, wherein the method comprises the following steps: in step S5, the low dielectric potting adhesive can resist temperature of more than 180 ℃ and has a dielectric constant of less than 2.
7. The method for forming the wave-absorbing component of the composite material with the sawtooth L-shaped variable cross-section hollow structure according to claim 1, wherein the method comprises the following steps: in step S6, the thickness of the single layer of the wave-transmitting skin of the cyanate ester quartz fiber prepreg is 0.2 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111120011.XA CN113858663A (en) | 2021-09-24 | 2021-09-24 | Method for forming sawtooth-provided L-shaped variable cross-section hollow-structure composite wave-absorbing component |
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| CN202111120011.XA CN113858663A (en) | 2021-09-24 | 2021-09-24 | Method for forming sawtooth-provided L-shaped variable cross-section hollow-structure composite wave-absorbing component |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115635700A (en) * | 2022-10-10 | 2023-01-24 | 廊坊市飞泽复合材料科技有限公司 | Development method of composite material and mold based on wet-process mold pressing process |
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