CN215791878U - Large-thickness honeycomb sandwich structure forming anti-collapse structure - Google Patents
Large-thickness honeycomb sandwich structure forming anti-collapse structure Download PDFInfo
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- CN215791878U CN215791878U CN202121770495.8U CN202121770495U CN215791878U CN 215791878 U CN215791878 U CN 215791878U CN 202121770495 U CN202121770495 U CN 202121770495U CN 215791878 U CN215791878 U CN 215791878U
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Abstract
The utility model belongs to the technical field of aviation composite material processing, and discloses a large-thickness honeycomb sandwich structure forming collapse-preventing structure which comprises a rubber pad and a metal plate, wherein the rubber pad completely wraps and covers the metal plate, the structure formed by the rubber pad and the metal plate is sheet-shaped, and the length size and the width size of the structure are 1-10 mm smaller than the size of an inclined plane of a honeycomb sandwich structure to be processed. When the large-thickness honeycomb sandwich structure is used, the lower skin and the glue film material are firstly paved, the large-thickness low-volume-weight honeycomb material is placed, then the glue film and the prepreg of the upper skin are paved, after the prepreg is paved, a layer of isolating film is paved on the surface of the prepreg, the structure is paved in the honeycomb inclined plane area, and then the large-thickness honeycomb sandwich structure is sealed and cured by the vacuum bag and the sealing rubber strip. The utility model has the function of uniformly applying pressure to the inclined plane area of the honeycomb, which is equivalent to increasing the lateral compressive strength of the large-thickness low-volume-weight honeycomb, and solves the problem of collapse of the inclined plane area honeycomb in the process of forming the large-thickness low-volume-weight honeycomb sandwich structure.
Description
Technical Field
The utility model belongs to the technical field of aviation composite material processing, relates to an auxiliary tool for processing composite materials, and particularly relates to a large-thickness honeycomb sandwich structure forming collapse prevention structure.
Background
The integral structure of the composite material is formed by combining the structure into a whole in the final forming process of the composite material through a specific design and manufacturing method, and the integral manufacturing process comprises co-curing, co-bonding and secondary bonding. At present, due to the flying wing type overall layout design of the high wing body fusion of the airplane, a large-area integral forming process technology is required.
In the fairing structure with the fused airplane wing body, because the requirements on strength, rigidity and weight are met, a honeycomb material with large thickness and low volume weight is required to be used as a core material of a honeycomb sandwich structure, and in the using process of the material, because the lateral compressive strength of a honeycomb is lower than the flat compressive strength, the defects of collapse, deformation and the like easily occur in a honeycomb inclined plane area in the forming process of the sandwich structure, so that the application of the honeycomb sandwich structure is limited. For this reason, only in composite structures with high strength (stiffness) and low weight requirements, honeycomb core materials with higher volume weights can be used as sandwich core materials, thereby sacrificing the weight of the sandwich structure.
In the co-curing and forming process of the large-thickness low-volume-weight honeycomb, the honeycomb has the problems of collapse, deformation and the like under the action of forming pressure, so that the skin material is folded, sunken and bent, and the manufacturing of the large-thickness low-volume-weight honeycomb sandwich structure cannot be finished.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a collapse prevention structure for forming a large-thickness honeycomb sandwich structure, which is used for preventing the collapse of the large-thickness honeycomb sandwich structure in the forming process.
The technical scheme of the utility model is as follows:
the utility model provides a large-thickness honeycomb sandwich structure shaping is prevented collapsing and is used structure, includes rubber pad and metal sheet, and the rubber pad wraps up completely and covers the metal sheet, and the structure that both formed is the slice, and its length dimension and width dimension are than treating the inclined plane size of processing honeycomb sandwich structure 1 ~ 10mm less.
Preferably, the length dimension and the width dimension of the structure formed by the rubber pad and the metal plate are 2-5 mm smaller than the size of the inclined plane of the honeycomb sandwich structure to be processed.
Furthermore, the thickness of the metal plate is 0.5-5 mm, and the material of the metal plate is aluminum alloy.
Further, the rubber pad is divided into 2 layers, and the metal plate is arranged between the 2 layers of rubber pads.
Further, the rubber pad divide into 3 layers, and metal sheet top is one deck rubber pad, and the below is two-layer rubber pad.
Furthermore, the thickness of the single-layer rubber pad is 0.2-2 mm.
Furthermore, the thickness-length ratio of the edge chamfer of the metal plate is 1: 5-1: 20, and the thickness-length ratio of the chamfer of the rubber pad is 1: 5-1: 30.
The utility model has the advantages that:
1. when the large-thickness honeycomb sandwich structure is cured, the rubber gasket with the metal lining plate is placed on the outer layer of the breathable material to prepare the large-thickness low-volume-weight honeycomb sandwich structure, and in the curing process, the rubber gasket with the metal lining plate plays a role in uniformly pressing the honeycomb in the inclined plane area to protect the honeycomb, so that the collapse phenomenon of the large-thickness low-volume-weight honeycomb in the co-curing process of the sandwich structure is reduced;
2. the size and the shape of the utility model can well and uniformly apply pressure to the honeycomb in the inclined plane area, and the chamfer design is convenient for paving and sticking an adhesive film and prepreg, and ensures that the cured skin layer is completely stuck with the honeycomb structure.
Drawings
FIG. 1 is a first schematic diagram illustrating the use of the present invention;
FIG. 2 is a schematic diagram of the use of the present invention;
FIG. 3 is a schematic structural view of the present invention;
the method comprises the following steps of 1-large-thickness honeycomb, 2-adhesive film, 3-prepreg, 4-isolating film, 5-breathable material, 6-structure of the utility model, 7-breathable film, 8-vacuum bag, 9-metal plate and 10-rubber pad.
Detailed Description
This section is an example of the present invention and is provided to explain and illustrate the technical solutions of the present invention.
The utility model provides a large-thickness honeycomb sandwich structure shaping is prevented collapsing and is used structure, includes rubber pad 10 and metal sheet 9, and rubber pad 10 wraps up completely and covers metal sheet 9, and the structure that both formed is the slice, and its length dimension and width dimension are than waiting to process honeycomb sandwich structure's inclined plane size 2 ~ 5mm less.
Preferably, the length dimension and the width dimension of the structure formed by the rubber pad 10 and the metal plate 9 are 2-5 mm smaller than the size of the inclined plane of the honeycomb sandwich structure to be processed.
The thickness of the metal plate 9 is 0.5-5 mm, and the material of the metal plate 9 is aluminum alloy.
The rubber pads 10 are divided into 2 layers, and the metal plate 9 is arranged between the 2 layers of rubber pads 10.
The rubber pads 10 are divided into 3 layers, one layer of rubber pad 10 is arranged above the metal plate 9, and two layers of rubber pads 10 are arranged below the metal plate.
The thickness of the single-layer rubber pad 10 is 0.2-2 mm.
The edge chamfer thickness length ratio of the metal plate 9 is 1: 5-1: 20, and the chamfer thickness length ratio of the rubber pad 10 is 1: 5-1: 30.
The using principle and the method of the utility model are as follows:
the utility model provides a honeycomb anti-collapse process method for forming a large-thickness honeycomb sandwich structure.
In the forming process of the large-thickness honeycomb sandwich structure, the traditional method only ties the prepreg at the edge of the sandwich structure by using the anti-slip strip, the method cannot protect the inclined surface area of the large-thickness honeycomb, and the area is a key part in the forming process of the large-thickness honeycomb sandwich structure and is very easy to collapse, deform and slide.
The utility model is used specifically according to the following steps:
1. the large-thickness honeycomb sandwich structure inclined plane area is partitioned according to size and shape, and meanwhile, the partitioned area is unfolded to be in a plane shape.
2. And cutting the rubber pad and the metal plate according to the sectional development drawing of the inclined surface of the large-thickness honeycomb sandwich structure.
3. Cleaning the forming flat plate mould, and coating a release agent on the surface of the forming flat plate mould.
4. And polishing and cleaning the surface of the metal plate, and thinning the edge of the metal plate.
5. Laying a layer of rubber pad on the surface of the mould, then placing the metal plate, and then placing a layer of rubber pad on the surface of the metal plate.
6. And sealing the laid rubber pad by adopting a vacuum bag, and conveying the rubber pad into an autoclave for curing.
7. After the rubber gasket with the liner plate is cured, the edge of the rubber gasket is thinned, and the rubber gasket is bent to be matched with the inclined plane area of the large-thickness honeycomb sandwich structure.
8. After the large-thickness honeycomb prepreg is laid and attached, a layer of isolating film is laid on the surface of the prepreg, then the rubber pad is placed on the inclined surface area of the honeycomb, then the breathable material is laid, and after the vacuum bag is adopted for sealing, the large-thickness honeycomb sandwich structure is cured.
In a development drawing of the inclined plane area of the large-thickness honeycomb sandwich structure, the size outline of the rubber pad is 1-10 mm smaller than that of the development drawing, and preferably 2-5 mm;
the thickness of the metal plate is 0.5 mm-5 mm, and the preferable thickness is 1 mm-2 mm; the metal plate can be aluminum alloy, steel plate, preferably aluminum alloy;
the thickness length ratio of the edge chamfer of the metal plate is 1: 5-1: 20, preferably 1: 10;
the chamfer thickness length ratio of the rubber pad is 1: 5-1: 30, preferably 1: 10;
the laying sequence of the rubber pads comprises a layer of rubber pad, a layer of metal plate and a layer of rubber pad, or comprises two layers of rubber pads, namely a layer of metal plate and a layer of rubber pad, wherein the thickness of the layer of rubber pad is 0.2-2 mm, and the preferred thickness of the rubber pad is 0.3-0.5 mm.
When the pressure pad is placed in the honeycomb inclined surface area, the distance between the edge of the pressure pad and the edge and the corner of the honeycomb is 1 mm-10 mm, and preferably 2 mm-5 mm.
In the process of forming the rubber pad, the curing temperature is 120-180 ℃, the curing pressure is 0.1-0.8 MPa, and the curing time is 1-5 h;
the rubber pad is placed in the large-thickness honeycomb inclined plane area in a mode shown in the figure, and can be placed on the surface of the isolation film or the surface of the breathable material.
The use method of the rubber pad comprises the following steps: firstly, paving a lower skin and a glue film material on the large-thickness honeycomb sandwich structure, and then placing the large-thickness low-volume-weight honeycomb material; and then, paving and pasting the adhesive film and the upper skin prepreg, paving a layer of isolation film on the surface of the prepreg after the prepreg is paved, paving a rubber pad with a metal lining plate in the inclined surface area of the honeycomb, sealing the large-thickness honeycomb sandwich structure by adopting a vacuum bag and a sealing rubber strip after paving the breathable material, and then curing.
Step one, partitioning and unfolding the inclined surface of the sandwich structure according to the inclined surface size of the large-thickness honeycomb sandwich structure, wherein the inclined surface size is 800mm multiplied by 800mm, the honeycomb thickness is 60mm, and the inclined surface chamfer angle is 30 degrees;
cutting the aluminum alloy plate with the thickness of 1.0mm according to the size of the development drawing, and then polishing and shaping the edge of the aluminum alloy plate according to the thickness-width ratio of 1:10 to thin the edge;
cutting rubber pads according to the size of the honeycomb inclined plane, wherein the size of each rubber pad can be 10mm larger than that of each side of a stainless steel plate, firstly laying a layer of rubber pad with the thickness of 0.3mm, then placing a cleaned aluminum alloy plate, and then laying a layer of rubber pad with the thickness of 0.3 mm;
and step four, curing the rubber pad after the rubber pad is laid, wherein the curing process is carried out at 150 ℃ under the pressure of 0.5MPa for 2 h. After the curing is finished, thinning the rubber pad at the edge of the rubber pad according to the thickness-length ratio of 1: 10;
and step five, laying a layer of isolating film on the surface of the large-thickness honeycomb interlayer prepreg which is laid, then laying a layer of breathable felt, vacuumizing and compacting once, and laying the prepared rubber pad on a honeycomb inclined surface area after compacting is completed. Laying a layer of breathable felt on the surface of the rubber mat, then carrying out primary vacuumizing compaction, and adjusting the position of the rubber mat after compaction is finished so that the rubber mat does not generate bridging, wrinkles and the like;
and step six, curing the large-thickness honeycomb sandwich structure.
Claims (7)
1. The utility model provides a large-thickness honeycomb sandwich structure shaping is prevented collapsing and is used structure which characterized in that, includes rubber pad (10) and metal sheet (9), and rubber pad (10) wraps up completely and covers metal sheet (9), and the structure that both formed is the slice, and its length dimension and width dimension are than treating 1 ~ 10mm less than honeycomb sandwich structure's inclined plane size.
2. The structure for preventing collapse in the molding of the large-thickness honeycomb sandwich structure as claimed in claim 1, wherein the rubber mat (10) and the metal plate (9) form a structure with a length dimension and a width dimension which are 2-5 mm smaller than the size of the inclined surface of the honeycomb sandwich structure to be processed.
3. The large-thickness honeycomb sandwich structure forming collapse prevention structure as claimed in claim 1, wherein the thickness of the metal plate (9) is 0.5-5 mm, and the material of the metal plate (9) is aluminum alloy.
4. The structure for forming a large-thickness honeycomb sandwich structure with collapse prevention according to claim 1, wherein the rubber mat (10) is divided into 2 layers, and the metal plate (9) is arranged between the 2 layers of rubber mats (10).
5. The structure for preventing collapse in the molding of a large-thickness honeycomb sandwich structure according to claim 1, wherein the rubber mat (10) is divided into 3 layers, and one layer of rubber mat (10) is arranged above the metal plate (9) and two layers of rubber mats (10) are arranged below the metal plate.
6. The large-thickness honeycomb sandwich structure forming anti-collapse structure according to claim 4 or 5, wherein the thickness of the single-layer rubber mat (10) is 0.2-2 mm.
7. The large-thickness honeycomb sandwich structure forming anti-collapse structure as claimed in claim 1, wherein the two side edges of the metal plate (9) and the rubber pad (10) are chamfered, the ratio of the thickness and the length of the chamfered edge of the metal plate (9) is 1: 5-1: 20, and the ratio of the thickness and the length of the chamfered edge of the rubber pad (10) is 1: 5-1: 30.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121770495.8U CN215791878U (en) | 2021-07-30 | 2021-07-30 | Large-thickness honeycomb sandwich structure forming anti-collapse structure |
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| CN202121770495.8U CN215791878U (en) | 2021-07-30 | 2021-07-30 | Large-thickness honeycomb sandwich structure forming anti-collapse structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114919241A (en) * | 2022-05-10 | 2022-08-19 | 宁波曙翔新材料股份有限公司 | Box-shaped composite material forming process suitable for paper honeycombs with large thickness |
| CN115350976A (en) * | 2022-07-21 | 2022-11-18 | 成都飞机工业（集团）有限责任公司 | Aramid fiber paper honeycomb core side pressure resistance pretreatment method and aramid fiber paper honeycomb core |
-
2021
- 2021-07-30 CN CN202121770495.8U patent/CN215791878U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114919241A (en) * | 2022-05-10 | 2022-08-19 | 宁波曙翔新材料股份有限公司 | Box-shaped composite material forming process suitable for paper honeycombs with large thickness |
| CN114919241B (en) * | 2022-05-10 | 2024-04-16 | 宁波曙翔新材料股份有限公司 | Box-shaped composite material forming process suitable for honeycomb containing large-thickness paper |
| CN115350976A (en) * | 2022-07-21 | 2022-11-18 | 成都飞机工业（集团）有限责任公司 | Aramid fiber paper honeycomb core side pressure resistance pretreatment method and aramid fiber paper honeycomb core |
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