CN111016306A - Preparation method of honeycomb interlayer composite material and honeycomb interlayer composite material - Google Patents
Preparation method of honeycomb interlayer composite material and honeycomb interlayer composite material Download PDFInfo
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- CN111016306A CN111016306A CN201911288397.8A CN201911288397A CN111016306A CN 111016306 A CN111016306 A CN 111016306A CN 201911288397 A CN201911288397 A CN 201911288397A CN 111016306 A CN111016306 A CN 111016306A
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- honeycomb
- composite material
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- cutting
- sandwich composite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/08—Interconnection of layers by mechanical means
- B32B7/09—Interconnection of layers by mechanical means by stitching, needling or sewing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
Abstract
The invention relates to the technical field of composite material forming, in particular to a preparation method of a honeycomb interlayer composite material and the honeycomb interlayer composite material. The preparation method comprises the following steps: selecting honeycombs with cutting allowance in the axial direction, respectively carrying out axial cutting at six corners at two ends of each honeycomb hole to form six cutting seams at the end part of each honeycomb hole, adding the depths of the cutting seams at the two ends of each honeycomb hole to be equal to the cutting allowance, then folding the hole wall of each honeycomb hole end part separated by the cutting seams along the bottom positions of the cutting seams to ensure that the hole wall of the folded end part is perpendicular to the axial direction of the honeycomb to form a honeycomb bonding surface, and bonding the two ends of the honeycomb with skins through the bonding surfaces at the two ends.
Description
Technical Field
The invention relates to the technical field of composite material forming, in particular to a preparation method of a honeycomb interlayer composite material and the honeycomb interlayer composite material.
Background
The honeycomb sandwich composite material has a great number of applications in the fields of vehicle-mounted, airborne and ship-based structures and electronics, the honeycomb sandwich structure has the advantages of high strength and light weight, the designability of electric thickness is strong, and the application in the fields of structures and wave-transmitting structures is further expanded.
The forming of the traditional honeycomb sandwich structure requires that a bonding part forms a relatively ideal glioma structure to fully exert the structural strength of a core layer, the rheological property, the viscosity-temperature property and other requirements of the formed ideal glioma structure on a cementing material are strict, and the structural characteristics of the honeycomb structure lead to the T-shaped bonding with the bonding force between a skin and the core layer of the honeycomb sandwich structure, the bonding surface is small, and simultaneously, the co-curing process is adopted, the adopted bonding system is mostly thermosetting resin systems such as epoxy, cyanate and the like, the flexibility is poor, the bonding strength and the bonding reliability are difficult to guarantee, and the strength of the honeycomb sandwich composite material is influenced.
Disclosure of Invention
Technical problem to be solved
The first purpose of the invention is to provide a preparation method of a honeycomb interlayer composite material, which can ensure the bonding quality and give consideration to the general process.
The second purpose of the invention is to provide a honeycomb sandwich composite material, which improves the bonding strength and bonding reliability between the honeycomb and the skin and the overall strength of the honeycomb sandwich composite material.
(II) technical scheme
In order to achieve the first object of the present invention, a first aspect of the present invention provides a method for preparing a honeycomb sandwich composite material, wherein the method for preparing the honeycomb sandwich composite material comprises the following steps:
s1, selecting a honeycomb with a cutting allowance in the axial direction;
s2, respectively carrying out axial cutting on six corners at two ends of each honeycomb hole to form a cutting seam at each corner at the end of each honeycomb hole, wherein the sum of the depths of the cutting seams at the two ends of each honeycomb hole is equal to a cutting allowance;
s3, folding the end hole wall of each honeycomb hole along the bottom position of the cutting seam, and enabling the folded end hole wall to be perpendicular to the axial direction of the honeycomb holes to form a honeycomb bonding surface;
and S4, co-curing or sub-curing the honeycomb prepared in the step S3 and the skin to obtain the honeycomb sandwich composite material.
With reference to the first implementation manner of the first aspect of the present invention, in the second implementation manner of the first aspect of the present invention, in step S2, the depth of the cutting slits at the two end portions of each honeycomb hole is the same.
With reference to the second implementation manner of the first aspect of the present invention, in a third implementation manner of the first aspect of the present invention, the depth of the cutting slit is smaller than the side length of the honeycomb holes, so as to avoid interference between honeycomb bonding surfaces.
In order to achieve the second object of the present invention, the second aspect of the present invention provides a honeycomb sandwich composite material, wherein in the first implementation manner, the honeycomb sandwich composite material comprises a honeycomb and skins respectively positioned at two ends of the honeycomb;
at two ends of the honeycomb, the end part of each honeycomb hole is provided with a turnover part which is integrally connected with the corresponding honeycomb hole and is vertical to the axial direction of the honeycomb hole;
the honeycomb is respectively bonded with the skin through the folding parts at the two ends.
With reference to the first implementation manner of the second aspect of the present invention, in a second implementation manner of the second aspect of the present invention, the length of the folded part in the radial direction of the honeycomb holes is smaller than the side length of the honeycomb holes, so as to avoid interference between the folded parts.
(III) advantageous effects
The technical scheme of the invention has the following advantages: the invention provides a preparation method of a honeycomb sandwich composite material, which comprises the steps of selecting honeycombs with cutting allowance in the axial direction, carrying out axial cutting on six corners at two ends of each honeycomb hole respectively, forming six cutting seams at the end part of each honeycomb hole, separating six sides of the end part of each honeycomb hole by the six cutting seams, enabling the depth of the cutting seams at each end part of each honeycomb hole to be equal to half of the cutting allowance, then turning over hole walls at the bottom positions of the cutting seams, separating the end parts of each honeycomb hole by the cutting seams, enabling the hole walls of the turned-over end parts to be perpendicular to the axial direction of the honeycombs to form honeycomb bonding surfaces, then bonding the two ends of each honeycomb with skins through bonding surfaces at the two ends respectively, and co-curing the bonded honeycombs and skins to obtain the honeycomb sandwich composite material. The preparation method realizes surface-to-surface bonding between the honeycomb and the skins at two ends, can ensure bonding quality, and also considers the existing general process.
According to the honeycomb sandwich composite material provided by the invention, the end part of each honeycomb hole is provided with the folded part at the two ends of the honeycomb, the folded parts are integrally connected with the corresponding honeycomb hole walls and are perpendicular to the axial direction of the honeycomb holes, the honeycomb is respectively bonded with the skin through the folded parts at the two ends, and the honeycomb sandwich composite material can effectively improve the bonding strength and the bonding reliability between the honeycomb and the skin and can effectively improve the overall strength of the honeycomb sandwich composite material.
Drawings
The drawings of the present invention are provided for illustrative purposes only, and the proportion and the number of the components in the drawings do not necessarily correspond to those of an actual product.
FIG. 1 is a schematic view of a honeycomb having a slit formed at one end thereof according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of section A of FIG. 1;
FIG. 3 is a schematic diagram of a honeycomb bonding surface formed at one end of a honeycomb according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a honeycomb sandwich composite material in an embodiment of the invention.
In the figure: 1: honeycombing; 11: honeycomb holes; 111: cutting a seam; 112: a honeycomb bonding surface; 2: and (4) covering the skin.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
The preparation method of the honeycomb sandwich composite material provided by the embodiment of the invention comprises the following steps:
first, the honeycomb 1 having a trimming margin in the axial direction is selected, that is, the axial height of the selected honeycomb is higher than the axial height required by the design.
The selected honeycomb 1 is processed, referring to fig. 1 and 2, six corners at two ends of each honeycomb hole 11 are respectively and axially cut, so that a cutting slit 111 is formed at each corner at the end of each honeycomb hole, six sides at the end of each honeycomb hole are separated by the six cutting slits, and the sum of the depths of the cutting slits 111 at the two ends of each honeycomb hole 11 is equal to the cutting allowance.
Then, the cell walls of each honeycomb cell with the ends separated by the kerf 111 are turned over along the bottom position of the kerf 111, so that the turned-over cell walls of the end are perpendicular to the axial direction of the honeycomb cell 11, and a honeycomb bonding surface 112 is formed, as shown in fig. 3.
And then bonding the prepared honeycomb 1 with the skin 2 through a honeycomb bonding surface 112 to prepare the honeycomb sandwich composite material, and referring to fig. 4.
The preparation method of the honeycomb sandwich composite material of the embodiment enables the honeycomb and the skins at two ends to realize surface-to-surface bonding, can ensure the bonding quality, gives consideration to the existing general technological process, only needs to pretreat the honeycomb, and can use the existing technology for other materials.
In some preferred embodiments, the depth of the slits 111 at both ends of each honeycomb cell 11 is the same, so that the honeycomb bonding surface 112 has the same length in the radial direction of the honeycomb cell 11.
In some preferred embodiments, the depth of the kerf 111 is less than the length of the sides of the honeycomb cells 11 to avoid interference between the honeycomb bonding surfaces 112.
It should be noted that the honeycomb and skin bonding process, the subsequent usable curing process, or the batch curing process are all conventional processes, and the processing sequence and steps thereof may use conventional general processes, which are not described herein again.
In one specific embodiment, the designed honeycomb sandwich composite material: the thickness of the skin is 2mm, the axial height of the honeycomb is 8mm, the side length of the hexagon of the honeycomb holes is 2.75mm, and the density of the honeycomb is 72kg/m3The aramid paper material is prepared.
Selecting an aramid paper honeycomb with the axial height of 12mm, wherein the cutting allowance is 3.6mm, the compression allowance is 0.4mm, respectively processing cutting seams with the depth of 1.8mm at six corners of each honeycomb hole at two ends of the honeycomb by using a cutting bed, and then turning over the end hole walls of the honeycomb holes along the bottom positions of the cutting seams by using a vacuum bag pressing process to enable the turned-over end hole walls to be perpendicular to the axial direction of the honeycomb to form a honeycomb bonding surface.
Bonding the honeycomb bonding surfaces at two ends with skins respectively, and finally preparing the processed honeycomb into a honeycomb sandwich composite material product by adopting a one-step co-curing process, wherein the axial height of the honeycomb of the prepared honeycomb sandwich composite material product is 8mm, and the thickness of the skins is 2 mm.
It should be noted that the reserved compression allowance is a common technique in the prior art, and a person skilled in the art can determine the reserved compression allowance according to the size and material of the honeycomb, and after final molding, the reserved compression allowance disappears under the action of pressure, so that the prepared part reaches the designed size, and details are not repeated herein.
It should be noted that any means capable of applying an axial force may be used when folding the end cell walls of the honeycomb cells, and the present invention is not limited thereto.
In a comparative embodiment, a honeycomb sandwich composite was also designed: the thickness of the skin is 2mm, the axial height of the honeycomb is 8mm, the side length of the hexagon of the honeycomb holes is 2.75mm, and the density of the honeycomb is 72kg/m3The aramid paper material.
In the comparative embodiment, the honeycomb sandwich composite material product is directly prepared by using the existing process (except that the relevant step of manufacturing a honeycomb bonding surface is omitted, and the rest is the same) with the same other dimensions and materials and the axial height of 8.4mm (wherein 0.4mm is reserved compression allowance). The honeycomb sandwich composite material product prepared by the two schemes is subjected to furnace sample sampling test. Test results show that the peel strength of the honeycomb sandwich composite material product prepared by the method is improved by 10%, the bending strength is improved by 15%, the bending failure mode is totally honeycomb body failure, and part of bonding interface failure occurs in a comparison group (the honeycomb sandwich composite material product prepared by a comparison embodiment (the prior art)), so that the honeycomb sandwich structure prepared by the method is good in strength and excellent in performance.
In yet another specific embodiment, a honeycomb sandwich composite is designed: the skin thickness is 1mm, the axial height of honeycomb is 7mm, the side length size of the hexagon of honeycomb holes is 3.2mm, the wall thickness is 0.1mm, and the honeycomb is made of aluminum. Selecting an axial height of 9mm, wherein the cutting allowance is 1.8mm, the compression allowance is 0.2mm, respectively processing the six corners of each honeycomb hole at the two ends of the honeycomb by using a cutting bed to have a depth of 0.9mm, then pressing the two honeycomb holes by using a tool with a spacing of 7.2mm, turning the hole walls of the end parts of the honeycomb holes along the bottom positions of the cutting seams, and enabling the turned hole walls of the end parts to be perpendicular to the axial direction of the honeycomb to form a honeycomb bonding surface. The honeycomb axial height of the manufactured honeycomb sandwich composite material product is 7mm, and the skin thickness is 1mm.
In a comparative embodiment, a honeycomb sandwich composite was also designed: the skin thickness is 1mm, the axial height of honeycomb is 7mm, the side length size of the hexagon of honeycomb holes is 3.2mm, the wall thickness is 0.1mm, and the honeycomb is made of aluminum.
In the comparative embodiment, the honeycomb with the axial height of 7.2mm (0.2mm is reserved compression allowance) and other sizes and materials are the same, and the honeycomb sandwich composite material product is directly prepared (except that the relevant step of manufacturing a honeycomb bonding surface is omitted, and the other sizes and materials are the same) by using the conventional process. The honeycomb sandwich composite material product prepared by the two schemes is subjected to furnace sample sampling test. Test results show that the peel strength of the honeycomb sandwich composite material product prepared by the method is improved by 10%, the bending strength is improved by 10%, the bending failure mode is totally honeycomb body failure, and a comparison group (the honeycomb sandwich composite material product prepared by a comparison embodiment (the prior art)) has partial bonding interface failure, so that the honeycomb sandwich structure prepared by the method is good in strength and excellent in performance.
Example two
Referring to fig. 1 to 4, the honeycomb sandwich composite material provided by the present embodiment includes a honeycomb 1 and skins 2 respectively located at two ends of the honeycomb, wherein at two ends of the honeycomb 1, an end of each honeycomb hole 11 has a folded portion, the folded portion is integrally connected with a corresponding honeycomb hole wall and perpendicular to an axial direction of the honeycomb hole, the folded portion serves as a honeycomb bonding surface, and the honeycomb is bonded to the skins 2 through the folded portions at two ends respectively.
This honeycomb intermediate layer combined material can effectively improve bonding strength and bonding reliability between honeycomb and the covering, can effectively improve honeycomb intermediate layer combined material's bulk strength.
In some preferred embodiments, the length of the flap in the radial direction of the honeycomb cell 11 is smaller than the side length of the honeycomb cell 11, avoiding interference between the flaps.
It should be noted that the honeycomb sandwich composite material of the present embodiment may be prepared by the preparation methods provided in the embodiments, or may be prepared by other methods, which is not limited herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: each embodiment does not include only one independent technical solution, and in the case of no conflict between the solutions, the technical features mentioned in the respective embodiments can be combined in any way to form other embodiments which can be understood by those skilled in the art.
Furthermore, modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the scope of the present invention, and the essence of the corresponding technical solutions does not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A preparation method of a honeycomb sandwich composite material is characterized by comprising the following steps: the method comprises the following steps:
s1, selecting a honeycomb with a cutting allowance in the axial direction;
s2, respectively carrying out axial cutting on six corners at two ends of each honeycomb hole to form a cutting seam at each corner at the end of each honeycomb hole, wherein the sum of the depths of the cutting seams at the two ends of each honeycomb hole is equal to the cutting allowance;
s3, folding the hole wall of the end part of each honeycomb hole along the bottom of the cutting seam, and enabling the folded hole wall of the end part to be perpendicular to the axial direction of the honeycomb holes to form a honeycomb bonding surface;
and S4, co-curing or sub-curing the honeycomb prepared in the step S3 and the skin to obtain the honeycomb sandwich composite material.
2. The method of claim 1, wherein: in step S2, the depth of the cutting slit at both ends of each honeycomb hole is the same.
3. The method of claim 2, wherein: the depth of the cutting seam is smaller than the side length of the honeycomb holes.
4. A honeycomb sandwich composite material characterized by: the honeycomb structure comprises a honeycomb and skins respectively positioned at two ends of the honeycomb;
the end part of each honeycomb hole is provided with a turnover part at the two ends of the honeycomb, and the turnover part is integrally connected with the corresponding honeycomb hole and is vertical to the axial direction of the honeycomb hole;
the honeycomb is respectively bonded with the skin through the folding parts at the two ends.
5. The honeycomb sandwich composite material of claim 4, wherein: the length of the turnover part in the radial direction of the honeycomb holes is smaller than the side length of the honeycomb holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911288397.8A CN111016306A (en) | 2019-12-16 | 2019-12-16 | Preparation method of honeycomb interlayer composite material and honeycomb interlayer composite material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911288397.8A CN111016306A (en) | 2019-12-16 | 2019-12-16 | Preparation method of honeycomb interlayer composite material and honeycomb interlayer composite material |
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| CN111016306A true CN111016306A (en) | 2020-04-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113183543A (en) * | 2021-04-02 | 2021-07-30 | 大连理工大学 | Two-dimensional close-packed array composite pipe clamp layer with lateral vent holes and processing method thereof |
| CN114055825A (en) * | 2021-11-19 | 2022-02-18 | 哈尔滨工业大学 | Preparation method of composite material curved surface honeycomb |
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| EP1123199B1 (en) * | 1998-10-24 | 2002-09-11 | K.U. Leuven Research & Development | Thermoplastic folded honeycomb structure and method for the production thereof |
| CN104260424A (en) * | 2014-09-05 | 2015-01-07 | 广州雷森体育有限公司 | Ball bedplate structure |
| US9550318B2 (en) * | 2006-12-05 | 2017-01-24 | Bradford Company | Method of making sandwich-like product starting with extruded profile |
| CN110065266A (en) * | 2019-04-18 | 2019-07-30 | 清华大学天津高端装备研究院洛阳先进制造产业研发基地 | A kind of titanium honeycomb sandwich structural slab and preparation method thereof |
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2019
- 2019-12-16 CN CN201911288397.8A patent/CN111016306A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1123199B1 (en) * | 1998-10-24 | 2002-09-11 | K.U. Leuven Research & Development | Thermoplastic folded honeycomb structure and method for the production thereof |
| US9550318B2 (en) * | 2006-12-05 | 2017-01-24 | Bradford Company | Method of making sandwich-like product starting with extruded profile |
| CN104260424A (en) * | 2014-09-05 | 2015-01-07 | 广州雷森体育有限公司 | Ball bedplate structure |
| CN110065266A (en) * | 2019-04-18 | 2019-07-30 | 清华大学天津高端装备研究院洛阳先进制造产业研发基地 | A kind of titanium honeycomb sandwich structural slab and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113183543A (en) * | 2021-04-02 | 2021-07-30 | 大连理工大学 | Two-dimensional close-packed array composite pipe clamp layer with lateral vent holes and processing method thereof |
| CN114055825A (en) * | 2021-11-19 | 2022-02-18 | 哈尔滨工业大学 | Preparation method of composite material curved surface honeycomb |
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Application publication date: 20200417 |