CN114919241A - Box-shaped composite material forming process suitable for paper honeycombs with large thickness - Google Patents
Box-shaped composite material forming process suitable for paper honeycombs with large thickness Download PDFInfo
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- CN114919241A CN114919241A CN202210532161.XA CN202210532161A CN114919241A CN 114919241 A CN114919241 A CN 114919241A CN 202210532161 A CN202210532161 A CN 202210532161A CN 114919241 A CN114919241 A CN 114919241A
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- paper honeycomb
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- composite material
- box
- paper
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- 241000264877 Hippospongia communis Species 0.000 title claims abstract description 118
- 239000002131 composite material Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 29
- 239000004593 Epoxy Substances 0.000 claims abstract description 12
- 238000005187 foaming Methods 0.000 claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
- B31D3/00—Making articles of cellular structure, e.g. insulating board
- B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
- B31D3/00—Making articles of cellular structure, e.g. insulating board
- B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
- B31D3/0292—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section involving auxiliary operations, e.g. expanding, moistening, glue-applying, joining, controlling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Laminated Bodies (AREA)
Abstract
The process for forming the box-shaped composite material containing the large-thickness paper honeycombs sequentially comprises the following steps of: s1, laying an outer skin; s2, laying the outer periphery thin paper honeycomb; s3, first vacuum bag pressing; s4, first curing; s5, laying the large-thickness paper honeycombs; s6, laying an inner skin; s7, pressing the vacuum belt for the second time; s8, secondary curing; steps S1-S4 are the first cycle: firstly, forming an outer skin and a thin paper honeycomb, ensuring that the side edge of a product has enough forming pressure, and brushing epoxy foaming glue to ensure that the outer skin can be effectively bonded in the thickness direction; the rest is the second period: brushing epoxy foaming glue in the thickness direction of the large-thickness paper honeycomb, and then placing the large-thickness paper honeycomb at the bottom of a space surrounded by the thin paper honeycomb, wherein the epoxy foaming glue ensures that the large-thickness paper honeycomb is effectively bonded with the thin paper honeycomb without generating a gap. The invention can obviously improve the mechanical property of each joint surface of the composite material.
Description
Technical Field
The invention relates to the technical field of composite material forming processes, in particular to a box-shaped composite material forming process suitable for paper honeycombs with large thickness.
Background
In the traditional composite material forming process, the paper honeycomb sandwich is a very common forming process structure.
For box-shaped composite material products, particularly when paper honeycombs with larger layer thickness and higher density are used as sandwich, the forming difficulty is increased suddenly: the key point is that the quality of the forming combination surface of the tiled large-thickness paper honeycomb and the skin (namely the combination position of the large-thickness paper honeycomb and the peripheral structure thereof) in the thickness direction does not meet the requirement, and phenomena such as hollowing, bridging and the like often occur. Because for the box-shaped composite material, in addition to using the large-thickness paper honeycomb as a sandwich layer in the length-width direction of the composite material, a thin paper honeycomb is required for the sandwich layer of the edge structure of the composite material, i.e., the edge structure is higher than the middle part so that the composite material is integrally formed into the box-shaped structure.
Especially for large-sized box-like composites, i.e. composites with length and width dimensions of more than 2 meters and length of more than 4 meters: because the overall size of the composite material is large, and the selected paper honeycomb has large thickness and high density, the conventional forming process of the large-size groove-type composite material containing the large-thickness paper honeycomb in the field is to form the large-size groove-type composite material according to a common female die prepreg forming method, and the steps of the conventional forming process are basically outer skin laying, paper honeycomb laying (firstly laying the large-thickness paper honeycomb and then laying thin paper honeycomb above the periphery), inner skin laying, vacuum belt pressing and curing. After the product is formed, the skin of the thick part of the large-thickness honeycomb in the thickness direction is not fully bonded with the large-thickness paper honeycomb due to the fact that no fixed pressure exists in the thickness direction of the large-thickness paper honeycomb, and phenomena such as hollowing, glue shortage, bridging and the like are generated.
In addition, because the paper honeycomb has high density and poor extensibility, gaps can not be filled at will like low-density paper honeycombs, so that the phenomenon of incomplete filling in the thickness direction of the paper honeycombs is caused, and great harm is caused to the mechanical property of products.
Disclosure of Invention
The invention aims to provide a forming process of a box-shaped composite material containing large-thickness paper honeycombs, which can optimize the existing forming process, so that the formed product can effectively overcome the forming defect in the thickness direction of the thick paper honeycombs, and ensure the structural mechanical strength of the product.
The technical scheme of the invention is that the forming process of the box-shaped composite material containing the large-thickness paper honeycombs sequentially comprises the following steps of:
s1, laying an outer skin;
s2, laying the outer periphery thin paper honeycomb;
s3, first vacuum bag pressing;
s4, first curing; s5, laying the large-thickness paper honeycombs;
s6, laying an inner skin;
s7, pressing the second vacuum belt;
s8, secondary curing;
the large-thickness paper honeycomb is a paper honeycomb with the thickness of more than 20 mm;
the thin paper honeycomb refers to a paper honeycomb having a thickness lower than that of the large-thickness paper honeycomb.
Further, in step S1, the outer skin is laid by integrally forming the outer skin into a box-like structure, wherein the bottom dimension is the same as the designed length and width dimension of the composite material, and the outer height is the same as the maximum designed height of the composite material.
Further, the thin paper honeycomb in the above step S2 is a paper honeycomb having a thickness in the range of 10mm or less; the tissue paper honeycomb is laid on the inner side of the whole height of the outer skin.
Further, in step S2, before the tissue paper honeycomb is laid, an epoxy foam adhesive is applied to the bonding surface of the tissue paper honeycomb and the outer skin to ensure that the outer skin and the tissue paper honeycomb are bonded to form a whole.
Further, in step S5, the length and width dimensions of the large-thickness paper honeycomb are respectively equal to the length and width dimensions of the composite material design minus twice the dimension of the box edge, which is the sum of the thicknesses of the outer skin and the thin paper honeycomb.
Further, in the step S5, the large-thickness paper honeycomb is laid on the bottom surface of the outer skin and in the space surrounded by the thin paper honeycomb; before the large-thickness paper honeycomb is laid, the bonding surface of the large-thickness paper honeycomb and the thin paper honeycomb is brushed with epoxy foaming glue so as to integrally form the large-thickness paper honeycomb and the thin paper honeycomb.
Further, the large-thickness paper honeycomb is a paper honeycomb with a thickness of not less than 35 mm.
Furthermore, the density of the large-thickness paper honeycomb is more than or equal to 96kg/m 3 。
The invention has the advantages that:
1) according to the invention, the forming quality of the skin of the product is improved and the forming quality of the skin in the thickness direction of the paper honeycomb is improved by adding one-time intermediate curing through adjusting the forming process, the layering sequence and the curing times of the box-shaped composite material in the traditional forming method, namely one-time curing.
2) According to the invention, the thin paper honeycomb is integrally laid on the inner side of the outer skin to integrally support the periphery of the product, so that the forming quality of each surface of the periphery of the product can be ensured, then the thick paper honeycomb is laid to reinforce and strengthen the support of the thin paper honeycomb, and the mechanical property of the product is naturally ensured along with the improvement of the forming quality of the product;
3) according to the invention, by enhancing the combination of the large-thickness paper honeycomb and the periphery, the subsequent unnecessary repair working hours are reduced, and the labor cost of the product is reduced.
Drawings
These and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of the shape of a large-sized cavity-type composite material according to the present invention;
FIG. 2 is a schematic view of a forming process of a large-sized groove-type composite material containing a large-thickness paper honeycomb in the prior art;
FIG. 3 is a schematic diagram of the embodiment of the present invention after the peripheral thin paper honeycomb is laid in the forming process of the large-sized groove-type composite material containing the large-thickness paper honeycomb;
fig. 4 is a schematic diagram of the composite material after the forming process of the large-size grooved composite material containing the large-thickness paper honeycomb is completed in the embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Comparative example 1
A forming process of a large box composite product is shown in figure I, the product adopts a composite material skin paper honeycomb sandwich, the thickness of four vertical edges is 10mm, and the thickness of the bottom is 36 mm. The peripheral dimension of the product is 5000 multiplied by 3000 multiplied by 80mm, and the selected paper honeycomb is high-density paper honeycomb due to the larger product, so that the hardness is hard and the shape following property is poor. The layering structure formed in a conventional manner is shown in fig. 2, and is a one-cycle integral curing forming process: firstly laying an outer skin, laying a paper honeycomb with the thickness of 36mm after laying, cutting the paper honeycomb by a machine tool, brushing epoxy foaming glue in the thickness direction after laying the paper honeycomb, then laying a thin paper honeycomb with the thickness of 10mm on the side edge, and finally laying an inner skin. The formed part has the effect that the part of the 36mm thick paper honeycomb brushed with the epoxy foaming adhesive is not enough to support the skin due to the expansion pressure of the foaming adhesive, so that the part of the skin is poor in forming quality, and the defects of hollowing, glue shortage, bridging and the like occur.
Example 1
A box-shaped composite material forming process suitable for paper honeycombs with large thickness can be divided into two periods:
in the first period, the outer skin and the thin paper honeycomb with the thickness of 10mm are firstly formed, the sufficient forming pressure on the side edge of the product is ensured, the epoxy foaming glue is brushed on the combined surface of the thin paper honeycomb with the thickness of 10mm and the outer skin, the effective bonding between the thin paper honeycomb with the thickness direction and the outer skin is ensured, the layering effect is as shown in figure 3, and then the first vacuum bag pressing and curing are carried out;
the second period forms a large-thickness paper honeycomb with the thickness of 36mm and an inner skin: the cycle forming mainly comprises the steps of brushing epoxy foaming adhesive in the thickness direction of a large-thickness paper honeycomb with the thickness of 36mm, then placing the large-thickness paper honeycomb at the bottom of a space surrounded by thin paper honeycombs, and ensuring that the large-thickness paper honeycomb is effectively bonded with the thin paper honeycombs through the epoxy foaming adhesive without generating gaps. The lay-up is shown in FIG. 4, followed by a second vacuum bag press and cure.
And then other forming processes are performed.
The optimized forming process of the invention ensures that the formed product can effectively solve the forming defect in the thickness direction of the thick paper honeycomb and ensure the structural mechanical strength of the product.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A box-shaped composite material forming process suitable for paper honeycombs with large thickness is characterized by sequentially comprising the following steps of:
s1, laying an outer skin;
s2, laying outer periphery thin paper honeycombs;
s3, first vacuum bag pressing;
s4, first curing;
s5, laying the large-thickness paper honeycombs;
s6, laying an inner skin;
s7, pressing the second vacuum belt;
s8, secondary curing;
the large-thickness paper honeycomb is a paper honeycomb with the thickness of more than 20 mm;
the thin paper honeycomb refers to a paper honeycomb having a thickness lower than that of the large-thickness paper honeycomb.
2. A process for forming a box-like composite material adapted to contain a large-thickness paper honeycomb in accordance with claim 1,
in step S1, the outer skin is laid by integrally forming the outer skin into a box-shaped structure, where the bottom dimension is the same as the designed length and width dimension of the composite material, and the peripheral height is the same as the maximum designed height of the composite material.
3. The process for forming a box-like composite material adapted for use with honeycombs of paper of great thickness according to claim 2,
the thin paper honeycomb in step S2 is a paper honeycomb having a thickness in the range of 10mm or less;
the tissue paper honeycomb is laid on the inner side of the whole height of the outer skin.
4. A process for forming a box-like composite material adapted for containing paper honeycombs of large thickness according to claim 3,
in the step S2, before the tissue paper honeycomb is laid, an epoxy foaming glue is applied to the bonding surface of the tissue paper honeycomb and the outer skin to ensure that the outer skin and the tissue paper honeycomb are bonded to form a whole.
5. A process for forming a box-like composite material adapted for containing paper honeycombs of large thickness according to claim 4,
in step S5, the length and width dimensions of the large-thickness paper honeycomb are respectively equal to the length and width dimensions of the composite material design minus twice the box edge dimension, and the box edge dimension is the sum of the thicknesses of the outer skin and the thin paper honeycomb.
6. A process for forming a box-like composite material adapted for containing paper honeycombs of large thickness according to claim 5,
in the step S5, the large-thickness paper honeycomb is laid on the bottom surface of the outer skin and in the space surrounded by the thin paper honeycomb;
before the large-thickness paper honeycomb is laid, the bonding surface of the large-thickness paper honeycomb and the thin paper honeycomb is brushed with epoxy foaming glue so as to integrally form the large-thickness paper honeycomb and the thin paper honeycomb.
7. A process for forming a large-sized box-shaped composite material suitable for use in a large-sized box-shaped container containing a large-sized paper honeycomb according to claim 6,
the large-thickness paper honeycomb refers to a paper honeycomb with the thickness of not less than 35 mm.
8. A process for forming a large-sized box-shaped composite material suitable for use in cases where a large-thickness paper honeycomb is included as set forth in claim 1,
the density of the large-thickness paper honeycomb is more than or equal to 96kg/m 3 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210532161.XA CN114919241B (en) | 2022-05-10 | 2022-05-10 | Box-shaped composite material forming process suitable for honeycomb containing large-thickness paper |
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| CN202210532161.XA CN114919241B (en) | 2022-05-10 | 2022-05-10 | Box-shaped composite material forming process suitable for honeycomb containing large-thickness paper |
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| CN114919241A true CN114919241A (en) | 2022-08-19 |
| CN114919241B CN114919241B (en) | 2024-04-16 |
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| CN113103628A (en) * | 2021-06-16 | 2021-07-13 | 宁波曙翔新材料股份有限公司 | Edge sealing method for aluminum honeycomb in low-temperature forming composite material sandwich structure antenna back plate |
| CN113635615A (en) * | 2021-07-30 | 2021-11-12 | 中国航空工业集团公司济南特种结构研究所 | Preparation process method of 90-degree chamfer honeycomb sandwich structure |
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| CN116160701A (en) * | 2022-12-09 | 2023-05-26 | 上海复合材料科技有限公司 | Forming method of large-curvature co-cured glass fiber reinforced plastic skin aramid fiber paper honeycomb sandwich structure |
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2022
- 2022-05-10 CN CN202210532161.XA patent/CN114919241B/en active Active
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| CN116160701A (en) * | 2022-12-09 | 2023-05-26 | 上海复合材料科技有限公司 | Forming method of large-curvature co-cured glass fiber reinforced plastic skin aramid fiber paper honeycomb sandwich structure |
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| CN114919241B (en) | 2024-04-16 |
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