阅读说明：本技术 碳纤维面板型蜂窝板板孔及其补强方法 (Carbon fiber panel type honeycomb plate hole and reinforcing method thereof ) 是由 李颜亮 夏振涛 程涛 李瑶瑶 陈攀宇 曹洪涛 范琳 孟凡萍 于 2021-09-29 设计创作，主要内容包括：本发明涉及蜂窝板制造领域内的一种碳纤维面板型蜂窝板板孔及其补强方法,包括如下步骤：S1,根据待补强的板孔结构尺寸制备碳纤维复合材料片、塞块、压板以及均压垫,均压垫表面粘贴有脱模布；S2,调配环氧树脂,并将环氧树脂均匀涂覆在碳纤维复合材料片上获得碳纤维预浸料片；S3,将碳纤维预浸料片铺敷于板孔的内周面后,将塞块(2)放入板孔内,然后将位于板孔之外的碳纤维预浸料片部分通过翻边的方式铺覆于蜂窝板的板面上；S4,将均压垫和压板依次叠放在碳纤维预浸料片上并压紧,清理补强区域多余的环氧树脂后进行固化；S5,待完全固化后拆除压板和均压垫。本发明方法操作简单便捷,可在室温下对任意部位、任一形状的板孔进行补强,适用性强。(The invention relates to a carbon fiber panel type honeycomb plate hole and a reinforcing method thereof in the field of honeycomb plate manufacturing, which comprises the following steps: s1, preparing a carbon fiber composite material sheet, a plug block, a pressing plate and a pressure equalizing pad according to the structural size of the plate hole to be reinforced, wherein demolding cloth is adhered to the surface of the pressure equalizing pad; s2, preparing epoxy resin, and uniformly coating the epoxy resin on the carbon fiber composite material sheet to obtain a carbon fiber prepreg sheet; s3, after carbon fiber prepregs are laid on the inner circumferential surfaces of the plate holes, the chock (2) is placed in the plate holes, and then the carbon fiber prepregs outside the plate holes are laid on the plate surfaces of the honeycomb plates in a flanging mode; s4, sequentially stacking the pressure equalizing pad and the pressure plate on the carbon fiber prepreg sheet and compacting, and curing after cleaning redundant epoxy resin in the reinforcing area; and S5, removing the pressing plate and the pressure equalizing pad after the materials are completely cured. The method is simple and convenient to operate, can reinforce any position and any shape of plate hole at room temperature, and is high in applicability.)

1. A reinforcing method for holes of a carbon fiber panel type honeycomb plate is characterized by comprising the following steps:

s1, preparing a carbon fiber composite material sheet (1), a chock block (2), a pressing plate (3) and a pressure equalizing pad (4) according to the size of a plate hole structure to be reinforced, wherein demolding cloth is adhered to the surfaces of the chock block (2) and the pressure equalizing pad (4);

s2, preparing epoxy resin, and uniformly coating the epoxy resin on the carbon fiber composite material sheet (1) to obtain a carbon fiber prepreg sheet;

s3, after the carbon fiber prepreg sheets are laid on the inner circumferential surfaces of the plate holes, the chock blocks (2) are placed in the plate holes, and then the carbon fiber prepreg sheets outside the plate holes are partially laid on the plate surfaces of the honeycomb plates in a flanging mode;

s4, sequentially stacking the pressure equalizing pad (4) and the pressure plate (3) on the carbon fiber prepreg sheet, compacting, cleaning redundant epoxy resin in a reinforcing area, and curing;

s5, after the full solidification, removing the chock block (2), the pressure plate (3) and the pressure equalizing pad (4).

2. The method for reinforcing the holes of the carbon fiber panel-type honeycomb plate according to claim 1, wherein in the step S1, the carbon fiber composite material sheets (1) are 4 sheets, 2 of which are rectangular structures and 2 of which are circular structures;

the length of the carbon fiber composite material sheet (1) with a rectangular structure is equal to the perimeter of the plate hole, and the width of the carbon fiber composite material sheet is equal to 2-5 times of the thickness of the plate hole;

the inner diameter of the carbon fiber composite material sheet (1) of the circular ring structure is equal to the diameter of the plate hole, and the outer diameter of the carbon fiber composite material sheet is equal to the diameter of the plate hole plus 2-5 times of the thickness of the plate hole.

3. The method for reinforcing the holes of the carbon fiber panel-type honeycomb plate according to claim 1, wherein in step S1, the height of the plugs (2) is kept consistent with the height of the holes of the plate after the carbon fiber prepreg is attached; the diameter of the chock block (2) is equal to the diameter minus Xmm of the plate hole, the X value is the sum of the total thickness of the carbon fiber prepreg attached to the inner circumferential surface of the plate hole, the thickness of the release cloth and the redundancy, and the redundancy is 0.1-0.2 mm.

4. The method for reinforcing holes of carbon fiber panel-type honeycomb panel according to claim 1, wherein in step S1, the pressure equalizing pad (4) is an elastic pad, and the elastic pad is a rubber pad or a foam pad.

5. The method for reinforcing the holes of the carbon fiber panel-type honeycomb plate according to claim 1, wherein in the step S1, the inner diameters of the pressure plate (3) and the pressure equalizing pad (4) are the same, and the outer diameter of the pressure plate (3) is larger than the outer diameter of the pressure equalizing pad (4).

6. The method for reinforcing the holes of the carbon fiber panel type honeycomb plate according to claim 1, wherein in step S3, the carbon fiber composite sheets (1) of two sets of rectangular structures are respectively marked as a first carbon fiber composite sheet and a second carbon fiber composite sheet, the width of the second carbon fiber composite sheet is greater than that of the first carbon fiber composite sheet, and carbon fiber prepregs formed by the first carbon fiber composite sheet and the second carbon fiber composite sheet are sequentially laid on the inner circumferential surface of the hole from inside to outside.

7. The method for reinforcing holes of carbon fiber panel-type honeycomb panel according to claim 6, in step S3, when the carbon fiber prepreg sheet is laid on the plate surface of the honeycomb plate except the edges of the plate holes, the flanging parts of the first carbon fiber composite material sheet and the second carbon fiber composite material sheet, which extend out of the plate hole, are provided with gaps at intervals, the first carbon fiber composite material sheet and the second carbon fiber composite material sheet are tightly paved on the surface of the honeycomb plate through the notch, then respectively paving the two groups of carbon fiber prepregs with the circular ring structures on the upper end surface and the lower end surface of the plate hole, wherein the carbon fiber prepregs with the circular ring structures are positioned on the carbon fiber prepregs with the rectangular structures, the carbon fiber prepreg with the rectangular structure is positioned in the outer edge of the carbon fiber prepreg with the circular ring structure;

the gaps formed at intervals of the first carbon fiber composite material sheets are not overlapped with the gaps formed at intervals of the second carbon fiber composite material sheets.

8. A carbon fiber panel type honeycomb plate hole structure is characterized by being prepared by the reinforcing method of the carbon fiber panel type honeycomb plate hole as claimed in any one of claims 1 to 7, and comprising a honeycomb plate and carbon fiber composite material sheets (1);

the honeycomb plate is characterized in that plate holes are formed in the honeycomb plate, the carbon fiber composite material sheets (1) are paved on the inner peripheral surfaces of the plate holes and the plate surfaces of the honeycomb plate which extend outwards for a preset distance along the edges of the plate holes through epoxy resin coating, and after solidification, the carbon fiber composite material sheets (1) form reinforcing structures at the plate holes.

9. The carbon fiber panel type honeycomb panel hole structure according to claim 8, wherein the carbon fiber composite material sheet (1) is 4 sheets, 2 of which are rectangular structures and 2 of which are circular ring structures;

the length of the carbon fiber composite material sheet (1) with a rectangular structure is equal to the perimeter of the plate hole, and the width of the carbon fiber composite material sheet is equal to 2-5 times of the thickness of the plate hole;

the inner diameter of the carbon fiber composite material sheet (1) of the circular ring structure is equal to the diameter of the plate hole, and the outer diameter of the carbon fiber composite material sheet is equal to the diameter of the plate hole plus 2-5 times of the thickness of the plate hole;

the two groups of carbon fiber composite material sheets (1) with rectangular structures are sequentially paved on the inner peripheral surface of the plate hole, the carbon fiber composite material sheets (1) positioned outside the plate hole are turned over and then attached to the plate surface of the honeycomb plate by a method of arranging spacing gaps, and the spacing gaps of the inner and outer layers of the carbon fiber composite material sheets (1) are not overlapped;

the carbon fiber composite material sheets (1) of the two groups of circular ring structures are respectively covered on the flanging parts of the carbon fiber composite material sheets (1) of the rectangular structures, and the outer edges of the carbon fiber composite material sheets (1) of the rectangular structures are positioned in the outer edges of the carbon fiber composite material sheets (1) of the circular ring structures.

10. The carbon fiber panel type honeycomb panel hole structure according to claim 9, wherein the carbon fiber composite material sheets (1) of two sets of rectangular structures are respectively marked as a first carbon fiber composite material sheet and a second carbon fiber composite material sheet, and the width of the second carbon fiber composite material sheet at the outer layer is larger than that of the first carbon fiber composite material sheet at the inner layer.

Technical Field

The invention relates to the field of honeycomb plate manufacturing, in particular to a carbon fiber panel type honeycomb plate hole and a reinforcing method thereof.

Background

Due to the requirements of weight reduction, cable channel reservation and the like, the cellular board needs to be perforated. However, the open pores reduce the lateral pressure performance, structural rigidity and peel resistance of the honeycomb panel near the pores, and must be reinforced, and metal profiles, plastic edge sealing strips and epoxy putty are generally used.

CN2659227Y discloses a plastic suction table top with an edge sealed by a honeycomb paper inner core, which comprises a panel, a bottom plate, a honeycomb paper inner core and an edge connector, wherein the panel and the bottom plate are formed by plastic suction or direct molding processing, and the honeycomb paper inner core is filled between the panel and the bottom plate and is fixedly connected with the panel and the bottom plate; the edge connecting piece is completely or partially coated on the periphery of the honeycomb paper inner core and is fixedly connected with the honeycomb paper inner core; the edges of the panel and the bottom plate are matched with the edge connecting piece in shape and are attached to each other and are fixedly connected, the edge connecting piece is a reinforcing frame of the table top plate, and the periphery of the table top plate can also play a role in decorating attractiveness. The edge connecting piece adopted by the patent is metal or plastic, and compared with a carbon fiber composite material, the edge connecting piece is heavy in weight, and poor in specific strength and specific rigidity; incompatible with the material system of the carbon fiber panel type honeycomb plate; the adopted section bar is not suitable for any hole shape on the honeycomb plate; welding is also used, and the process is complex.

CN2366469Y discloses a panel, specifically is a waterproof and moistureproof paper honeycomb sandwich panel reinforced by edge banding. The paper honeycomb sandwich board is formed by mutually gluing a paper honeycomb core and a paper panel, wherein the periphery of the paper honeycomb sandwich board is filled with a closed foaming material, and the paper panel is coated with a moisture-proof and waterproof coating layer. The foaming adhesive material adopted by the patent has lower mechanical property and is incompatible with a carbon fiber panel type honeycomb panel material system.

CN103590532A discloses an edge sealing structure of a honeycomb sandwich shelter wallboard and an edge sealing method thereof, wherein the adopted edge sealing structure is low-density epoxy putty which is composed of epoxy resin and light filler. The same blade coating method as common putty is adopted, after curing, the honeycomb panel needs to be polished to be flat and smooth by abrasive cloth, the post-treatment workload is large, the forming quality and precision are not high, and the stripping resistance of the honeycomb panel near the holes cannot be effectively improved.

The traditional method adopts materials adopted by reinforcing methods such as metal sectional materials, plastic edge banding, epoxy putty and the like which are incompatible with a carbon fiber composite material system, has heavy mass, lower specific strength and specific rigidity and large processing workload after curing, and is not suitable for reinforcing holes in any position and shape of the carbon fiber panel type honeycomb plate.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a carbon fiber panel type honeycomb plate hole and a reinforcing method thereof.

The invention provides a reinforcing method for holes of a carbon fiber panel type honeycomb plate, which comprises the following steps:

s1, preparing a carbon fiber composite material sheet, a chock block, a pressing plate and a pressure equalizing pad according to the structural size of a plate hole to be reinforced, wherein demolding cloth is adhered to the surfaces of the chock block and the pressure equalizing pad;

s2, preparing epoxy resin, and uniformly coating the epoxy resin on the carbon fiber composite material sheet to obtain a carbon fiber prepreg sheet;

s3, after the carbon fiber prepreg sheets are laid on the inner circumferential surfaces of the plate holes, the chock blocks are placed in the plate holes, and then the carbon fiber prepreg sheets outside the plate holes are laid on the plate surfaces of the honeycomb plates in a flanging mode;

s4, sequentially stacking the pressure equalizing pad and the pressure plate on the carbon fiber prepreg sheet, compacting, and curing after cleaning redundant epoxy resin in a reinforcing area;

and S5, removing the chock block, the pressure plate and the pressure equalizing pad after the chock block, the pressure plate and the pressure equalizing pad are completely solidified.

In some embodiments, in step S1, the carbon fiber composite material sheets are 4 sheets, wherein 2 sheets have a rectangular structure and 2 sheets have a circular structure;

the length of the carbon fiber composite material sheet with the rectangular structure is equal to the perimeter of the plate hole, and the width of the carbon fiber composite material sheet is equal to 2-5 times of the thickness of the plate hole;

the inner diameter of the carbon fiber composite material sheet of the circular ring structure is equal to the diameter of the plate hole, and the outer diameter of the carbon fiber composite material sheet of the circular ring structure is equal to the diameter of the plate hole plus 2-5 times of the thickness of the plate hole.

In some embodiments, in step S1, the height of the plugs is consistent with the height of the holes of the plates after the carbon fiber prepreg sheet is attached; the diameter of the chock is equal to the diameter minus Xmm of the plate hole, the X value is the sum of the total thickness of the carbon fiber prepreg attached to the inner circumferential surface of the plate hole, the thickness of the release cloth and the redundancy, and the redundancy is 0.1-0.2 mm.

In some embodiments, in step S1, the pressure equalizing pad is an elastic pad, and the elastic pad is a rubber pad or a foam pad.

In some embodiments, in step S1, the inner diameter of the pressure plate is the same as the inner diameter of the pressure equalizing pad, and the outer diameter of the pressure plate is larger than the outer diameter of the pressure equalizing pad.

In some embodiments, in step S3, two sets of rectangular carbon fiber composite sheets are respectively denoted as a first carbon fiber composite sheet and a second carbon fiber composite sheet, the width of the second carbon fiber composite sheet is greater than that of the first carbon fiber composite sheet, and carbon fiber prepregs formed from the first carbon fiber composite sheet and the second carbon fiber composite sheet are sequentially laid on the inner circumferential surface of the plate hole from inside to outside.

In some embodiments, in step S3, when the carbon fiber prepregs are laid on the plate surface of the honeycomb plate outside the edge of the plate hole, the flanged portions of the first carbon fiber composite sheet and the second carbon fiber composite sheet extending to the outside of the plate hole are provided with spaced notches, the first carbon fiber composite sheet and the second carbon fiber composite sheet are tightly laid on the plate surface of the honeycomb plate through the notches, then two sets of carbon fiber prepregs with a circular ring structure are laid on the upper end surface and the lower end surface of the plate hole respectively, the carbon fiber prepregs with a circular ring structure are located on the carbon fiber prepregs with a rectangular structure, and the carbon fiber prepregs with a rectangular structure are located inside the outer edge of the carbon fiber prepregs with a circular ring structure;

the gaps formed at intervals of the first carbon fiber composite material sheets are not overlapped with the gaps formed at intervals of the second carbon fiber composite material sheets.

The invention also provides a carbon fiber panel type honeycomb plate hole structure which is prepared by adopting the reinforcing method of the carbon fiber panel type honeycomb plate hole and comprises a honeycomb plate and a carbon fiber composite material sheet;

the honeycomb plate is provided with plate holes, the carbon fiber composite material sheets are paved on the inner peripheral surfaces of the plate holes and the plate surfaces of the honeycomb plate extending outwards along the edges of the plate holes for a preset distance by coating epoxy resin, and after solidification, the carbon fiber composite material sheets form reinforcing structures at the plate holes.

In some embodiments, the carbon fiber composite material sheet is 4 sheets, wherein 2 sheets have a rectangular structure and 2 sheets have a circular structure;

the length of the carbon fiber composite material sheet with the rectangular structure is equal to the perimeter of the plate hole, and the width of the carbon fiber composite material sheet is equal to 2-5 times of the thickness of the plate hole;

the inner diameter of the carbon fiber composite material sheet of the circular ring structure is equal to the diameter of the plate hole, and the outer diameter of the carbon fiber composite material sheet of the circular ring structure is equal to the diameter of the plate hole plus 2-5 times of the thickness of the plate hole;

the two groups of carbon fiber composite material sheets with rectangular structures are sequentially paved on the inner circumferential surface of the plate hole, the carbon fiber composite material sheets positioned outside the plate hole are turned over and then attached to the plate surface of the honeycomb plate by a method of arranging spacing gaps, and the spacing gaps of the inner layer of carbon fiber composite material sheet and the outer layer of carbon fiber composite material sheet are not overlapped;

the carbon fiber composite material sheets of the two groups of circular ring structures are respectively covered on the flanging parts of the carbon fiber composite material sheets of the rectangular structures, and the outer edges of the carbon fiber composite material sheets of the rectangular structures are positioned in the outer edges of the carbon fiber composite material sheets of the circular ring structures.

In some embodiments, the two sets of rectangular-shaped carbon fiber composite sheets are respectively referred to as a first carbon fiber composite sheet and a second carbon fiber composite sheet, and the width of the second carbon fiber composite sheet at the outer layer is greater than the width of the first carbon fiber composite sheet at the inner layer.

Compared with the prior art, the invention has the following beneficial effects:

1. the method is simple and convenient to operate, can reinforce any position and any shape of plate hole at room temperature, and is high in applicability.

2. The carbon fiber prepreg is adopted for reinforcing the plate holes, so that the composite plate has the advantages of light weight, high specific strength and high specific rigidity, is compatible with a continuous carbon fiber reinforced resin matrix composite panel material system, and can greatly improve the peeling resistance of the carbon fiber panel at the plate hole part of the honeycomb plate.

3. According to the invention, by accurately calculating the structural sizes of the chock block, the pressing plate and the pressure equalizing pad, the forming surface of the reinforcing hole part after curing is good in quality and high in precision, and post-treatment such as polishing is not required.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a structural cross-sectional view of the holes of the carbon fiber panel type honeycomb plate of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

Example 1

The embodiment provides a reinforcing method for holes of a carbon fiber panel type honeycomb plate, which comprises the following steps:

and S1, preparing the corresponding carbon fiber composite material sheet 1, the chock block 2, the pressure plate 3 and the pressure equalizing pad 4 according to the plate hole structure size to be reinforced. Wherein:

the thickness of the carbon fiber composite material sheet 1 is 0.08-0.15mm, and the material of the carbon fiber composite material sheet is the same as or similar to that of the honeycomb plate so as to improve the compatibility of the carbon fiber composite material sheet and the honeycomb plate. The structural dimension of the carbon fiber composite material sheet 1 is designed according to the structural dimension of the plate holes, 4 carbon fiber composite material sheets 1 correspond to each plate hole to be reinforced, wherein 2 carbon fiber composite material sheets are of rectangular structures, and 2 carbon fiber composite material sheets are of circular ring structures. The structural dimensions of the carbon fiber composite material sheet 1 of rectangular structure are: length equals the circumference girth of plate hole, and the width equals 2-5 times of plate hole thickness, and the structural dimension of the carbon-fibre composite material tablet 1 of ring structure is: the inner diameter is equal to the diameter of the plate hole, and the outer diameter is equal to the diameter of the plate hole plus 2-5 times of the thickness of the plate hole.

The chock 2 is a metal chock, the surface of the chock 2 is pasted with demolding cloth, the height of the chock is equal to the whole height of the plate hole after the carbon fiber material sheet 1 is laid, the diameter of the chock is equal to the diameter of the plate hole minus Xmm, the X value of the chock is the sum of the total thickness of the carbon fiber composite material sheet 1 attached to the inner circumferential surface of the plate hole, the thickness of the demolding cloth and the redundancy, and the redundancy is 0.1-0.2 mm. When the chock 2 is formed by machining, the tolerance of the chock 2 is selected according to the principle of body insertion, so that the outer peripheral surface of the chock 2 can be tightly attached to the carbon fiber composite material sheet 1 paved on the inner peripheral surface of the hole of the plate.

The pressing plate 3 is an annular structural plate, the inner diameter of the pressing plate is the same as that of the plate hole, the pressing plate is made of an aluminum alloy material and is not prone to deformation when being pressed, and the carbon fiber composite material sheet 1 can be completely covered by the appearance of the pressing plate 3. The pressure equalizing pad 4 is made of elastic materials, the thickness of the pressure equalizing pad is not less than 3mm, the pressure equalizing pad can be a rubber pad or a foam pad, the pressure equalizing pad 4 is an annular structure pad, the inner diameter of the pressure equalizing pad is the same as the diameter of a plate hole, the pressure equalizing pad 4 is adopted to apply pressure to a carbon fiber prepreg sheet paved on the honeycomb plate 5 uniformly, and adverse effects such as unevenness of the surface of the honeycomb plate can not be caused. A layer of demoulding cloth is arranged on the pressure equalizing pad 4, and the demoulding cloth is made of polytetrafluoroethylene.

Because chock 2, clamp plate 3 and pressure equalizing pad 4 all calculate the size through the accuracy, the reinforcement hole position shaping surface quality is good, the precision is high after the solidification, need not carry out aftertreatment such as polish.

And S2, preparing epoxy resin, and uniformly coating the epoxy resin on the carbon fiber composite material sheet to obtain the carbon fiber prepreg sheet. The epoxy resin can be cured at normal temperature, the curing time can be shortened by proper heating, and the curing can be quickly finished within 3 hours under the condition of proper heating.

S3, laying the carbon fiber prepreg sheets on the inner circumferential surfaces of the plate holes, then placing the chock 2 into the plate holes, and laying the carbon fiber prepreg sheets outside the plate holes on the plate surfaces of the honeycomb plates in a flanging mode. The method specifically comprises the following steps: the carbon fiber composite material sheets 1 of the two groups of rectangular structures are respectively marked as a first carbon fiber composite material sheet and a second carbon fiber composite material sheet, the first carbon fiber composite material sheet and the second carbon fiber composite material sheet form a first carbon fiber prepreg sheet and a second carbon fiber prepreg sheet, after the first carbon fiber prepreg sheet is pasted on the inner peripheral surface of the plate hole, the second carbon fiber prepreg sheet is pasted on the first carbon fiber prepreg sheet, and then the chock 2 is placed in the plate hole. Because the widths of the first carbon fiber prepreg and the second carbon fiber prepreg are larger than the axial length of the plate hole, the excessive parts are attached to the plate surface of the honeycomb plate in a flanging mode to form a wrapping edge, and preferably, the width of the first carbon fiber prepreg is smaller than that of the second carbon fiber prepreg, so that the first prepreg laid on the plate surface of the honeycomb plate is covered by the second carbon fiber prepreg, and the structural strength can be effectively improved after curing. Preferably, the parts of the first carbon fiber prepreg and the second carbon fiber prepreg, which are located outside the two ends of the plate hole, are respectively attached to the plate surface of the honeycomb plate through gaps with a certain distance, and further, the gaps, which are formed when the first carbon fiber prepreg and the second carbon fiber prepreg extend to the outside of the plate hole, are not overlapped, so that the tightness of the two layers of prepregs laid on the plate surface of the honeycomb plate is strengthened.

After the first carbon fiber prepreg and the second carbon fiber prepreg of the two groups of rectangular structures are laid on the plate holes, the carbon fiber prepregs formed by the carbon fiber composite material sheets of the two groups of circular structures are respectively laid on the surfaces of the honeycomb plates on the upper end surface and the lower end surface of the plate holes. Preferably, the second carbon fiber prepreg is located below the carbon fiber prepreg of the circular ring structure, and the first carbon fiber prepreg is covered by the second carbon fiber prepreg at the moment, so that the technical effect of blank pressing covering is sequentially formed by the first carbon fiber prepreg, the second carbon fiber prepreg and the second carbon fiber prepreg, and the overall structural strength of the reinforced plate hole can be further improved.

S4, the pressure equalizing pad 4 coated with the demolding cloth is placed on a carbon fiber prepreg sheet with a circular ring structure, then the pressure equalizing pad 3 is placed on the pressure equalizing pad 4 and is pressed tightly, and the excess epoxy resin in the reinforcing area is cured at normal temperature or in a heating state after being cleaned.

And S5, removing the pressure plate 3 and the pressure equalizing pad 4 after the curing is completed.

The carbon fiber prepreg is adopted for reinforcing the plate holes, so that the composite plate has the advantages of light weight, high specific strength and high specific rigidity, is compatible with a continuous carbon fiber reinforced resin matrix composite panel material system, and can greatly improve the peeling resistance of the carbon fiber panel at the plate hole part of the honeycomb plate. In addition, the method is simple and convenient to operate, can reinforce any position and any shape of plate hole at room temperature, and is high in applicability.

The following is exemplified by a plate hole reinforcement of one particular structural dimension:

a honeycomb plate with the thickness of 20mm and prepared by adopting a continuous carbon fiber reinforced resin matrix composite skin needs a round through hole with the diameter of 100mm due to weight reduction, and the honeycomb plate is reinforced by adopting the following method, wherein the thickness of a carbon fiber composite sheet 1 is 0.1mm, and the thickness of a demoulding cloth is 0.1 mm:

s1, preparing carbon fiber composite material sheets 1 for reinforcement, wherein the total number of the carbon fiber composite material sheets 1 is 4, 2 of the carbon fiber composite material sheets are rectangular structures, the sizes of the carbon fiber composite material sheets are 314mm multiplied by 60mm in length and 314mm multiplied by 80mm in width, 2 of the carbon fiber composite material sheets are circular ring structures, the structural sizes of the carbon fiber composite material sheets 1 with the two circular ring structures are the same, and the carbon fiber composite material sheets are circular ring structure sheets with the inner diameter phi 100mm and the outer diameter phi 160 mm; preparing 1 chock 2 with the diameter phi of 99.2mm (redundancy of 0.2mm) and the height of 20.4mm, and preparing according to an in-body principle by taking m-level tolerance; preparing 2 pressing plates 3 which are 5mm thick and made of aluminum alloy with the outer diameter of phi 180mm (larger than phi 160 mm); 2 pressure equalizing pads 4 with the outer diameter of phi 160mm are prepared by using 4mm rubber pads, and demolding cloth made of polytetrafluoroethylene is adhered to the surfaces of the pressure equalizing pads.

And S2, preparing epoxy resin, and uniformly coating the epoxy resin on 4 carbon fiber composite material sheets to obtain the carbon fiber prepreg sheet.

S3, sequentially paving the first carbon fiber prepreg and the second carbon fiber prepreg of the two groups of rectangular structures on the plate hole from inside to outside, then placing the chock 2, cutting the first carbon fiber prepreg and the second carbon fiber prepreg outside the two end faces of the plate hole according to the distance of 10mm to form notches, and staggering the positions of the notches on the first carbon fiber prepreg and the second carbon fiber prepreg by 5mm to enable the carbon fiber prepregs to be tightly paved on the plate face of the honeycomb plate, and then paving the two groups of carbon fiber prepregs of the circular ring structure on the corresponding plate faces at the two ends of the plate hole to be reinforced respectively.

And S4, placing the pressure equalizing pad 4 adhered with the demolding cloth on a carbon fiber prepreg sheet, then placing the upper pressing plate 3 and pressing, and curing after cleaning the redundant epoxy resin in the reinforcing area.

And sixthly, removing the chock 2, the pressing plate 3 and the pressure equalizing pad 4 after the concrete is completely cured.

Example 2

In embodiment 2, a carbon fiber panel type honeycomb plate hole structure is provided on the basis of embodiment 1, and is prepared by the reinforcing method for the carbon fiber panel type honeycomb plate hole in embodiment 1, and includes a carbon fiber panel and a carbon fiber composite material sheet 1;

be equipped with the diaphragm orifice on the carbon fiber panel, carbon-fibre composite material piece 1 closely pastes after the solidification in the inner peripheral surface of diaphragm orifice and along the face of the carbon fiber panel of the outside preset distance that extends in the border of diaphragm orifice through coating epoxy. The carbon fiber composite material sheet 1 comprises 4 sheets, wherein 2 sheets are in a rectangular structure, and 2 sheets are in a circular structure. The length of the carbon fiber composite material sheet 1 with the rectangular structure is equal to the perimeter of the plate hole, and the width of the carbon fiber composite material sheet is equal to 2-5 times of the thickness of the plate hole; the inner diameter of the carbon fiber composite material sheet 1 with the circular ring structure is equal to the diameter of the plate hole, and the outer diameter of the carbon fiber composite material sheet is equal to the diameter of the plate hole plus 2-5 times of the thickness of the plate hole.

Two groups of carbon fiber composite material sheets 1 with rectangular structures are sequentially laid on the inner circumferential surface of the plate hole in a stacking manner, the carbon fiber composite material sheets 1 positioned outside the plate hole are turned over and attached to the plate surface of the carbon fiber panel by a gap spacing method, and the gap spacing of the inner and outer carbon fiber composite material sheets 1 are not overlapped; the two groups of carbon fiber composite material sheets 1 with the circular ring structures are respectively covered on the flanging parts of the carbon fiber composite material sheets 1 with the rectangular structures.

Preferably, two sets of carbon fiber composite material sheets 1 with rectangular structures are respectively marked as a first carbon fiber composite material sheet and a second carbon fiber composite sheet, and the width of the second carbon fiber composite material sheet located at the outer layer is greater than that of the first carbon fiber composite material sheet located at the inner layer.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.