CN110757829A - Method for preventing special-shaped honeycomb sandwich structure from collapsing - Google Patents
Method for preventing special-shaped honeycomb sandwich structure from collapsing Download PDFInfo
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- CN110757829A CN110757829A CN201911162101.8A CN201911162101A CN110757829A CN 110757829 A CN110757829 A CN 110757829A CN 201911162101 A CN201911162101 A CN 201911162101A CN 110757829 A CN110757829 A CN 110757829A
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- honeycomb
- sandwich structure
- collapsing
- pressure pad
- preventing
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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
- B29C70/30—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
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the technical field of airplane structure design, and particularly relates to a method for preventing a special-shaped honeycomb sandwich structure from collapsing. Firstly, shaping a honeycomb, and shaping the honeycomb by using a honeycomb shaping die; then vertically placing the shaped honeycomb for gluing; thirdly, machining or grinding to remove the allowance of the honeycomb core; then, the special-shaped honeycomb is prevented from being crushed and deformed in the curing process through the pressure pad; and finally, after the honeycomb machine is added, when the subsequent glue film laying and curing and skin laying and curing are carried out, the pressure pad manufactured in the fourth step is used for laying in the honeycomb area to be formed, which needs to be protected. The invention effectively solves the problems that the honeycomb core is vertically placed and molded in the molding process of the special-shaped honeycomb sandwich structure radar cover, and is crushed and deformed in the curing process, the process method is simple and effective, the use is convenient, the application range is wide, and good quality benefit and economic benefit are obtained.
Description
Technical Field
The invention belongs to the technical field of airplane structure design, and particularly relates to a method for preventing a special-shaped honeycomb sandwich structure from collapsing.
Technical scheme
The composite material with the paper honeycomb sandwich structure is a typical structural design scheme with high specific strength and high specific rigidity, the high strength and high modulus of a panel are organically combined with the low density and high rigidity of a sandwich core, and the existing honeycomb sandwich structure is widely applied to the field of manufacturing of airplane radomes. Most of the composite material parts with the honeycomb sandwich structure are manufactured by a pressure curing process of an autoclave or an oven, and the honeycomb bearing direction is a honeycomb end face. At present, most aircraft radome adopts honeycomb sandwich structure, along with the improvement of aircraft performance requirement, more and more heterotypic cover has appeared, and radome's profile curve is more and more littleer, and some even become the crest line or closed angle form, and the honeycomb variation in crest line or closed angle position is big, according to appearance and structural requirement, honeycomb sandwich's loading end probably is changed honeycomb wall direction into by the honeycomb terminal surface. When the honeycomb is required to be vertically placed and molded, the stress surface of the honeycomb is in the direction of the honeycomb wall, and the strength is greatly reduced. In the implementation process of the autoclave curing process of the composite material honeycomb sandwich structure, the problem of honeycomb collapse can occur in the curing process when the formed honeycomb is vertically placed.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a collapse prevention control method for a honeycomb sandwich structure, which solves the problem that a honeycomb formed in the vertical direction collapses in the curing process. The integrity of the honeycomb structure is ensured.
The technical scheme is as follows: a method for preventing a special-shaped honeycomb sandwich structure from collapsing comprises the following steps:
step one, honeycomb shaping, namely shaping the honeycomb by using a honeycomb shaping mold;
the honeycomb shaping die is manufactured according to the molded surface of the honeycomb area, and the vertically placed honeycomb is horizontally placed for shaping during honeycomb shaping. The molding surface of the honeycomb shaping mold is divided into an upper part and a lower part, the size of the lower part of the molding surface is required to respectively meet the molding surface requirement of the honeycomb adhesive surface of the inner skin of the composite material cover body specified in the product drawing, and the upper part of the molding surface is consistent with the vertical honeycomb section.
Secondly, bonding the honeycomb; and (3) vertically placing and gluing the shaped honeycomb in the honeycomb gluing process. After the honeycomb combination is finished, placing a honeycomb with proper thickness or a silica gel strip wrapped by clean varnished cloth or an isolating film outside the edge of the honeycomb to be closely attached to the honeycomb for transition so as to avoid forming a bridge or generating side pressure on the honeycomb, fixing the periphery by using an adhesive tape, and basically enabling the outer edge of the honeycomb or the silica gel plate to be consistent with the outer edge paved and attached by a skin.
Thirdly, machining or polishing to remove the allowance of the honeycomb core; and then machining or grinding the complex curved surfaces such as edges, sharp corners, R arcs and the like by the honeycomb external machine.
And fourthly, forming an outer skin, and ensuring that the special-shaped honeycomb is not collapsed and deformed in the curing process through a pressure pad.
According to the machined shape of the vertical honeycomb area, a pressure pad with an adaptive shape is manufactured and used for protecting a vertically placed and formed honeycomb area from being crushed and deformed in the curing process. The pressure pad can be made of independent rubber materials, composite materials or metal materials, and the rigidity of the pressure pad is increased by paving the composite materials, the glass cloth materials or the metal materials in the rubber materials. The pressure pad should have both good conformability and certain rigidity. The honeycomb structure has the advantages that the molded surface of the honeycomb structure to be protected is ensured to be consistent, the problems of skin bridging and the like are avoided, external pressure in the curing process can be offset by certain rigidity, and the honeycomb is ensured not to be deformed. When the pressure pad is used, the surface of the pressure pad is perforated, so that the ventilation of a workpiece is facilitated, and redundant glue solution flows out when the skin is solidified.
And fifthly, after the honeycomb machine is added, performing subsequent curing procedures such as glue film laying and curing, skin laying and curing and the like, when laying auxiliary materials, laying the pressure pads manufactured in the fourth step on a honeycomb area needing to be protected, and laying varnished cloth or an isolating film between the forming area and the pressure pads.
The beneficial technical effects are as follows: by adopting the method provided by the invention, the low-strength surface of the honeycomb is protected from being crushed and deformed by a rigid pressure pad in the curing process of the manufactured part. The invention effectively solves the problems that the honeycomb core is vertically placed and molded in the molding process of the special-shaped honeycomb sandwich structure radar cover, and is crushed and deformed in the curing process, the process method is simple and effective, the use is convenient, the application range is wide, and good quality benefit and economic benefit are obtained.
Drawings
Figure 1 is a schematic view of a honeycomb pattern former,
figure 2 shows the honeycomb sheet after the forming,
figure 3 is a schematic view of the structure of the honeycomb after being glued,
figure 4 is a schematic view of the honeycomb core profile with the excess removed,
figure 5 is a schematic view of the outer skin forming structure,
fig. 6 curing process pressure pad is used.
Detailed Description
The existing abnormal-shaped honeycomb sandwich structure radar cover needs to be vertically placed and molded with a honeycomb core in local structure molding, the strength of the honeycomb core in the vertical direction is low, skin curing is generally a curing process of an oven or an autoclave, external pressure is applied to a workpiece in the curing process, the honeycomb placed in the vertical direction is erected, the strength in the vertical direction is insufficient, and the problem that the honeycomb is easily collapsed due to external pressure in the process is solved.
The first step is as follows: and (3) honeycomb shaping, namely shaping the honeycomb (see figure 2) by using a honeycomb shaping die (see figure 1).
1) Manufacturing a special honeycomb shaping die according to the molded surface of the honeycomb area, and horizontally placing the vertically placed honeycomb for shaping when shaping the honeycomb. The molding surface of the honeycomb shaping mold is divided into an upper part and a lower part, the size of the lower part of the molding surface is required to respectively meet the molding surface requirement of the honeycomb adhesive surface of the inner skin of the composite material cover body specified in the product drawing, and the upper part of the molding surface is consistent with the vertical honeycomb section.
The second step is that: honeycomb adhesive joint (see figure 3)
2) And (3) vertically placing and gluing the shaped honeycomb in the honeycomb gluing process. After the honeycomb is combined, the outer side of the edge of the honeycomb is tightly attached to the honeycomb, the honeycomb is placed to be in proper thickness, and the honeycomb is basically flush with the outer surface of the honeycomb after being placed; the honeycomb or the silica gel strip wrapped by clean varnished cloth or an isolating film is transited to avoid forming a bridge or generating side pressure on the honeycomb, the periphery of the honeycomb or the silica gel strip is fixed by an adhesive tape, and the outer edge of the honeycomb or the silica gel plate is basically consistent with the outer edge of the skin paving.
The third step: machining or grinding to remove the honeycomb core allowance (see figure 4)
3) And then machining or grinding the complex curved surfaces such as edges, sharp corners, R arcs and the like by the honeycomb external machine.
The fourth step: outer skin formation (see fig. 5), use of pressure pad (see fig. 6)
4) According to the machined shape of the vertical honeycomb area, a special pressure pad is manufactured for protecting a vertically placed and formed honeycomb area from being crushed and deformed in the curing process. The pressure pad can be made of independent rubber materials, composite materials or metal materials, and the rigidity of the pressure pad is increased by paving the composite materials, the glass cloth materials or the metal materials in the rubber materials. The pressure pad should have both good conformability and certain rigidity. The honeycomb structure has the advantages that the molded surface of the honeycomb structure to be protected is ensured to be consistent, the problems of skin bridging and the like are avoided, external pressure in the curing process can be offset by certain rigidity, and the honeycomb is ensured not to be deformed. When the pressure pad is used, the surface of the pressure pad is perforated, so that the ventilation of a workpiece is facilitated, and redundant glue solution flows out when the skin is solidified.
5) And (3) after the honeycomb machine is added, performing subsequent curing procedures such as glue film laying and curing, skin laying and curing and the like, laying auxiliary materials, laying the pressure pads manufactured in the fourth step on a honeycomb area needing to be protected, and laying varnished cloth or an isolating film between the forming area and the pressure pads.
Claims (9)
1. A method for preventing a special-shaped honeycomb sandwich structure from collapsing is characterized by comprising the following steps: the method comprises the following steps:
step one, honeycomb shaping, namely shaping the honeycomb by using a honeycomb shaping die;
secondly, bonding the honeycomb; vertically placing the shaped honeycomb for gluing;
thirdly, machining or polishing to remove the allowance of the honeycomb core;
fourthly, forming an outer skin, and ensuring that the special-shaped honeycomb is not deformed by compression in the curing process through a pressure pad;
and fifthly, after the honeycomb machine is added, when the subsequent glue film laying and curing and skin laying and curing are carried out, the pressure pad manufactured in the fourth step is laid in the honeycomb area to be formed, which needs to be protected.
2. The method for preventing the profiled honeycomb sandwich structure from collapsing as claimed in claim 1, wherein: when the honeycomb is shaped, the honeycomb shaping mold is matched with the appearance manufactured according to the molded surface of the honeycomb area, and the vertically placed honeycomb is horizontally placed for shaping when the honeycomb is shaped.
3. The method for preventing the profiled honeycomb sandwich structure from collapsing as claimed in claim 2, wherein: the honeycomb shaping die is divided into an upper part and a lower part, the size of the lower part of the honeycomb shaping die is required to respectively meet the requirement of the molded surface of a composite material cover body inner skin honeycomb adhesive surface specified in a product drawing, and the upper part of the honeycomb shaping die is consistent with the vertical honeycomb section.
4. The method for preventing the profiled honeycomb sandwich structure from collapsing as claimed in claim 1, wherein: in the second step, after the honeycomb is shaped and combined, a honeycomb with proper thickness or a silica gel strip wrapped by clean varnished cloth or an isolating film is placed outside the edge of the honeycomb to be closely attached to the honeycomb for transition so as to avoid bridging or generate side pressure on the honeycomb, the honeycomb or the silica gel strip is fixed around by using an adhesive tape, and the outer edge of the honeycomb or the silica gel plate is basically consistent with the outer edge of the skin paving.
5. The method for preventing the profiled honeycomb sandwich structure from collapsing as claimed in claim 1, wherein: and in the third step, removing allowance is to add complex curved surfaces such as edges, sharp corners, R arcs and the like on the honeycomb external forming machine by a machining or grinding process.
6. The method for preventing the profiled honeycomb sandwich structure from collapsing as claimed in claim 1, wherein: and fourthly, manufacturing a pressure pad with an adaptive shape according to the machined shape of the vertical honeycomb area, wherein the pressure pad is used for protecting the vertically placed and molded honeycomb area from being crushed and deformed in the curing process.
7. The method for preventing the profiled honeycomb sandwich structure from collapsing as claimed in claim 1 or 6, wherein the method comprises the following steps: the pressure pad can be made of independent rubber materials, composite materials or metal materials, and the rigidity of the pressure pad is increased by paving the composite materials, the glass cloth materials or the metal materials in the rubber materials.
8. The method for preventing the profiled honeycomb sandwich structure from collapsing as claimed in claim 7, wherein: and perforating the surface of the pressure pad.
9. The method for preventing the profiled honeycomb sandwich structure from collapsing as claimed in claim 1, wherein: and a varnished cloth or an isolating film is laid between the honeycomb to-be-formed area and the pressure pad.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019106928276 | 2019-07-26 | ||
| CN201910692827.6A CN110561777A (en) | 2019-07-26 | 2019-07-26 | method for preventing special-shaped honeycomb sandwich structure from collapsing |
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| CN110757829A true CN110757829A (en) | 2020-02-07 |
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| CN201910692827.6A Pending CN110561777A (en) | 2019-07-26 | 2019-07-26 | method for preventing special-shaped honeycomb sandwich structure from collapsing |
| CN201911162101.8A Pending CN110757829A (en) | 2019-07-26 | 2019-11-21 | Method for preventing special-shaped honeycomb sandwich structure from collapsing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111267457A (en) * | 2020-02-26 | 2020-06-12 | 成都飞机工业（集团）有限责任公司 | Forming device of equal-height honeycomb sandwich structure |
| CN113246496A (en) * | 2021-06-16 | 2021-08-13 | 北玻院(滕州)复合材料有限公司 | Composite material wrinkle eliminating tool and manufacturing device and method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112026205B (en) * | 2020-08-20 | 2022-07-01 | 四川一诺高分子材料科技有限公司 | Manufacturing method of common radar antenna housing |
| CN113090932B (en) * | 2021-04-08 | 2022-09-16 | 南京航空航天大学 | Regular polygonal honeycomb sandwich component and preparation method thereof |
Citations (3)
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|---|---|---|---|---|
| CN101769418A (en) * | 2008-12-29 | 2010-07-07 | 陶春有 | Aluminum alloy fabric folding honeycomb board and forming process thereof |
| CN107139503A (en) * | 2017-01-20 | 2017-09-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The forming method of composite cylinder component partial honeycomb sandwich construction |
| CN109291486A (en) * | 2018-08-23 | 2019-02-01 | 江苏恒神股份有限公司 | A kind of hyperbolicity Special paper honeycomb structure setting process method |
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2019
- 2019-07-26 CN CN201910692827.6A patent/CN110561777A/en active Pending
- 2019-11-21 CN CN201911162101.8A patent/CN110757829A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769418A (en) * | 2008-12-29 | 2010-07-07 | 陶春有 | Aluminum alloy fabric folding honeycomb board and forming process thereof |
| CN107139503A (en) * | 2017-01-20 | 2017-09-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The forming method of composite cylinder component partial honeycomb sandwich construction |
| CN109291486A (en) * | 2018-08-23 | 2019-02-01 | 江苏恒神股份有限公司 | A kind of hyperbolicity Special paper honeycomb structure setting process method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111267457A (en) * | 2020-02-26 | 2020-06-12 | 成都飞机工业（集团）有限责任公司 | Forming device of equal-height honeycomb sandwich structure |
| CN113246496A (en) * | 2021-06-16 | 2021-08-13 | 北玻院(滕州)复合材料有限公司 | Composite material wrinkle eliminating tool and manufacturing device and method thereof |
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| CN110561777A (en) | 2019-12-13 |
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Application publication date: 20200207 |