CN114919241B - Box-shaped composite material forming process suitable for honeycomb containing large-thickness paper - Google Patents
Box-shaped composite material forming process suitable for honeycomb containing large-thickness paper Download PDFInfo
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- CN114919241B CN114919241B CN202210532161.XA CN202210532161A CN114919241B CN 114919241 B CN114919241 B CN 114919241B CN 202210532161 A CN202210532161 A CN 202210532161A CN 114919241 B CN114919241 B CN 114919241B
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- China
- Prior art keywords
- paper honeycomb
- thickness
- honeycomb
- outer skin
- composite material
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- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims abstract description 20
- 239000004593 Epoxy Substances 0.000 claims abstract description 16
- 238000005187 foaming Methods 0.000 claims abstract description 15
- 239000003292 glue Substances 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 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
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Laminated Bodies (AREA)
Abstract
The box-shaped composite material forming process suitable for the honeycomb containing the large-thickness paper comprises the following steps of: s1, paving an outer skin; s2, paving an outer Zhou Baozhi honeycomb; s3, performing first vacuum bagging; s4, performing primary curing; s5, laying a large-thickness paper honeycomb; s6, paving inner skin; s7, carrying out secondary vacuum belt pressure; s8, curing for the second time; steps S1-S4 are a first period: firstly, forming an outer skin and a thin paper honeycomb, ensuring that the side edge of a product has enough forming pressure, brushing epoxy foaming glue to ensure that the epoxy foaming glue can be effectively bonded with the outer skin in the thickness direction; the remainder is the second period: brushing epoxy foaming glue on the thickness direction of the large-thickness paper honeycomb, and then placing the epoxy foaming glue at the bottom of a space surrounded by the thin paper honeycomb, wherein the epoxy foaming glue ensures that the large-thickness paper honeycomb and the thin paper honeycomb are effectively bonded, and no gap is generated. The invention can obviously improve the mechanical properties of each joint surface of the composite material.
Description
Technical Field
The present invention relates generally to the technical field of composite material forming processes, and in particular to a box-shaped composite material forming process suitable for honeycomb containing large thickness paper.
Background
In the traditional composite material forming process, the paper honeycomb sandwich is a very conventional and common forming process structure.
For box-like composite products, in particular when using paper honeycomb with a relatively large layer thickness and a high density as a sandwich, the difficulty of molding increases dramatically: the key point is that the quality of the forming joint surface of the tiled large-thickness paper honeycomb (namely the joint between the thickness direction of the large-thickness paper honeycomb and the peripheral structure thereof) cannot meet the requirement, and the phenomena of hollowing, bridging and the like often occur. Because for box-like composites, in addition to using a large thickness paper honeycomb as the sandwich layer in the length-width direction of the composite, a tissue honeycomb is also required for the sandwich layer of the edge structure of the composite, i.e. the edge structure is higher than the middle portion, resulting in the composite as a whole forming a box-like structure.
In particular for large-size box-like composite materials, i.e. composite materials with a length-width dimension of greater than 2 meters and a length of greater than 4 meters: because the composite material has large overall size, the selected paper honeycomb has large thickness and high density, the conventional forming process for the large-size groove type composite material containing the large-thickness paper honeycomb in the field is to form according to a common female prepreg forming method, and the steps of outer skin laying-paper honeycomb laying (firstly, the large-thickness paper honeycomb is laid, and then, the thin paper honeycomb is laid above the periphery of the paper honeycomb), inner skin laying-vacuum belt pressing-curing are basically carried out. After the product is formed, the skin of the thickness direction part of the large-thickness honeycomb is inadequately adhered with the large-thickness paper honeycomb due to no fixed pressure in the thickness direction of the large-thickness paper honeycomb, and phenomena such as hollowness, lack of glue, bridging and the like are generated.
In addition, because the paper honeycomb density is high, the extensibility is very poor, and gaps can not be filled at will like the paper honeycomb with low density, so that the phenomenon of incomplete filling in the thickness direction of the paper honeycomb can be generated, and the mechanical property of the product is greatly damaged.
Disclosure of Invention
The invention aims to provide a box-shaped composite material forming process suitable for a honeycomb containing large-thickness paper, which can optimize the existing forming process, so that the formed product can effectively solve the forming defect of the thick paper honeycomb in the thickness direction and ensure the structural mechanical strength of the product.
The invention adopts the technical scheme that the box-shaped composite material forming process suitable for the honeycomb containing the large-thickness paper sequentially comprises the following steps:
s1, paving an outer skin;
s2, paving an outer Zhou Baozhi honeycomb;
s3, performing first vacuum bagging;
s4, performing primary curing; s5, laying a large-thickness paper honeycomb;
s6, paving inner skin;
s7, carrying out secondary vacuum belt pressure;
s8, curing for the second time;
the large-thickness paper honeycomb is paper honeycomb with the thickness of more than 20 mm;
the thin paper honeycomb refers to a paper honeycomb having a lower thickness than the large-thickness paper honeycomb.
Further, in the step S1, the outer skin is laid by forming the outer skin integrally into a box-shaped structure, the bottom dimension is the same as the designed length-width dimension of the composite material, and the peripheral height is the same as the maximum designed height of the composite material.
Further, the thin paper honeycomb in the step S2 refers to a paper honeycomb having a thickness in a range of 10mm or less; the tissue honeycomb is laid over the entire height inside the outer skin.
Further, in the step S2, before the thin paper honeycomb is laid, epoxy foam is brushed on the bonding surface between the thin paper honeycomb and the outer skin to ensure that the outer skin and the thin paper honeycomb are bonded together to form a whole.
Further, in the step S5, the length-width dimension of the large-thickness paper honeycomb is equal to the length-width dimension of the composite design minus twice the box edge dimension, 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 is located in the space surrounded by the thin paper honeycomb; before the large-thickness paper honeycomb is paved, epoxy foaming glue is brushed on the joint surface of the large-thickness paper honeycomb and the thin paper honeycomb so as to integrally form the large-thickness paper honeycomb and the thin paper honeycomb.
Further, the large-thickness paper honeycomb refers to a paper honeycomb having a thickness of not less than 35 mm.
Further, the density of the large-thickness paper honeycomb≥96kg/m 3 。
The invention has the advantages that:
1) The invention improves the molding quality of the product skin and the molding quality of the skin in the thickness direction of the paper honeycomb by adjusting the molding process, the layering sequence and the curing times of the box-shaped composite material and adding one intermediate curing in the traditional molding method.
2) According to the invention, the thin paper honeycomb is integrally paved on the inner side of the outer skin, so that the peripheral direction of the product is integrally supported, the forming quality of each surface of the periphery of the product can be ensured, then the thick paper honeycomb is paved, the support of the thin paper honeycomb is reinforced and enhanced, and the mechanical property of the product is naturally ensured along with the improvement of the forming quality of the product;
3) The invention reduces the subsequent unnecessary repair time and reduces the labor cost of the product by enhancing the combination of the honeycomb with the large thickness paper and the periphery.
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, wherein:
FIG. 1 is a schematic illustration of the appearance of a large-size fluted composite of the present invention;
FIG. 2 is a schematic diagram of a prior art molding process for a large-size fluted composite material containing a honeycomb of large thickness;
FIG. 3 is a schematic illustration of an embodiment of the present invention after laying an outer Zhou Baozhi honeycomb in a large-size fluted composite molding process with a large-thickness paper honeycomb;
FIG. 4 is a schematic illustration of the formation of a composite material after completion of the formation of a large-size fluted composite material containing a honeycomb of large thickness according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to understand the invention better.
Comparative example 1
A molding process of a large box type composite material product is shown in a first drawing, wherein 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 36mm. The peripheral size of the product is 5000 multiplied by 3000 multiplied by 80mm, and the paper honeycomb is high-density paper honeycomb, so that the product has hard hardness and poor shape following property. The ply structure formed in a conventional manner is shown in fig. 2, and is a one-cycle integral curing forming process: the method comprises the steps of paving an outer skin, paving paper honeycomb with the thickness of 36mm after the outer skin is paved, cutting the paper honeycomb through a machine tool, brushing epoxy foaming glue in the thickness direction after the paper honeycomb is paved, paving a thin paper honeycomb with the thickness of 10mm on the side edge, and paving an inner skin. The formed effect is that the expansion pressure of the foaming adhesive is insufficient to support the skin at the part of the 36mm thick paper honeycomb brush epoxy foaming adhesive, so that the skin at the part has poor forming quality, and the defects of hollowing, adhesive shortage, bridging and the like are caused.
Example 1
The box-shaped composite material forming process suitable for honeycomb with large thickness paper can be divided into two periods:
firstly forming an outer skin and a 10mm thick thin paper honeycomb in a first period, ensuring that the side edge of a product has enough forming pressure, brushing epoxy foaming glue on the joint surface of the 10mm thick thin paper honeycomb and the outer skin, ensuring that the epoxy foaming glue can be effectively bonded with the outer skin in the thickness direction, and performing first vacuum bagging and curing after the layering effect is shown in figure 3;
second cycle forming 36mm thick large thickness paper honeycomb and inner skin: the periodic forming is mainly to brush epoxy foaming glue on the thickness direction of a large-thickness paper honeycomb with the thickness of 36mm, then place the epoxy foaming glue at the bottom of a space surrounded by a thin paper honeycomb, and the epoxy foaming glue ensures that the large-thickness paper honeycomb and the thin paper honeycomb are effectively bonded without generating gaps. Lay-up is shown in fig. 4, followed by a second vacuum bagging and curing.
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 of thick paper honeycomb in the thickness direction and ensure the structural mechanical strength of the product.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or 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 various embodiments described. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (1)
1. A box-like composite material molding process suitable for honeycomb containing large-thickness paper, which is characterized by comprising the following steps in sequence:
s1, paving an outer skin;
s2, paving an outer Zhou Baozhi honeycomb;
s3, performing first vacuum bagging;
s4, performing primary curing;
s5, laying a large-thickness paper honeycomb;
s6, paving inner skin;
s7, carrying out secondary vacuum belt pressure;
s8, curing for the second time;
the thin paper honeycomb refers to a paper honeycomb with a thickness lower than that of the large-thickness paper honeycomb;
in the step S1, the method for paving the outer skin is that the outer skin integrally forms a box-shaped structure, 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;
the thin paper honeycomb in the step S2 refers to a paper honeycomb with a thickness in the range of 10mm or less;
the tissue paper honeycomb is paved on the inner side of the whole height of the outer skin;
in the step S2, before the thin paper honeycomb is laid, epoxy foam is brushed on the joint surface between the thin paper honeycomb and the outer skin to ensure that the outer skin and the thin paper honeycomb are adhered to form a whole;
the large-thickness paper honeycomb is paper honeycomb with the thickness not less than 35 mm;
the density of the large-thickness paper honeycomb is more than or equal to 96kg/m 3 ；
In the 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 dimensions, and the box edge dimensions are the sum of the thicknesses of the outer skin and the thin paper honeycomb;
in the step S5, the large-thickness paper honeycomb is laid on the bottom surface of the outer skin and in a space surrounded by the thin paper honeycomb;
before the large-thickness paper honeycomb is paved, epoxy foaming glue is brushed on the joint surface of the large-thickness paper honeycomb and the thin paper honeycomb so as to integrally form the large-thickness paper honeycomb and the thin paper honeycomb.
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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN114919241A CN114919241A (en) | 2022-08-19 |
| CN114919241B true CN114919241B (en) | 2024-04-16 |
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| CN202210532161.XA Active 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 (en) | 2022-08-19 |
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