CN115816932B - Structural design and preparation process of high-strength honeycomb plate - Google Patents
Structural design and preparation process of high-strength honeycomb plate Download PDFInfo
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- CN115816932B CN115816932B CN202211525335.6A CN202211525335A CN115816932B CN 115816932 B CN115816932 B CN 115816932B CN 202211525335 A CN202211525335 A CN 202211525335A CN 115816932 B CN115816932 B CN 115816932B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000012938 design process Methods 0.000 title description 3
- 238000000034 method Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 5
- 238000005219 brazing Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011162 core material Substances 0.000 description 43
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000002202 Polyethylene glycol Substances 0.000 description 4
- 229920001223 polyethylene glycol Polymers 0.000 description 4
- 238000010146 3D printing Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910020239 KAlF4 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005304 joining Methods 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
- 238000004321 preservation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Laminated Bodies (AREA)
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Abstract
The invention relates to the technical field of high-strength honeycomb plate structure design and preparation, in particular to a high-strength honeycomb plate structure design, which comprises a high-strength honeycomb plate, wherein the high-strength honeycomb plate consists of an upper panel, a lower panel and a middle core plate, the core plates are formed by connecting honeycomb shapes surrounded by variable-thickness plates, the edge thickness of the core plates is changed along the side length direction in a certain rule, the thickness near the middle part of each side is the largest, the thickness near the vertex of a hexagon is the smallest, and the high-strength honeycomb plate structure is stable, high in compressive strength, strong in deformation resistance and obvious in light-weight effect and is more suitable for being used on spacecrafts and large airplanes.
Description
Technical Field
The invention relates to the technical field of high-strength honeycomb plate structure design and preparation, in particular to a high-strength honeycomb plate structure design and preparation process.
Background
The honeycomb panel is widely applied to various industries such as vehicle manufacturing, aerospace, furniture, medical treatment and the like. For example, in aerospace, the structural materials of satellites, the shell structures of rocket heads, and manned spacecraft cabins are all related to cellular board structures, and other cellular board structures such as antenna shells for radars, military shelters, combination boards for battlefield bulkheads, front and rear bumpers for some vehicles, and the like are used in large numbers.
At present, the design for improving the strength of the honeycomb board basically increases the material consumption of the core part, so that the overall quality and the materials required for manufacturing are increased, and the advantages of light weight, low density and the like of the honeycomb board are weakened.
The Chinese patent with the publication number of CN104001973B discloses a processing method of a honeycomb core section through searching, wherein the positioning surface of the honeycomb core section is placed on the positioning surface of a tool, polyethylene glycol is poured into a honeycomb core and then heated until the polyethylene glycol is melted into liquid, the liquid is cooled at normal temperature, the polyethylene glycol is adhered to the honeycomb core section and the tool, the honeycomb core section is processed, and finally, the polyethylene glycol is heated and cleaned from the processed honeycomb core section again. The method is simpler, but a large amount of chemical reagents are used in the process to pollute the environment, and the production safety hidden trouble is involved.
The chinese patent with the publication CN 102389927B discloses a method for manufacturing a honeycomb panel and a honeycomb panel, which is characterized in that, by means of profiles, fixing bends adapted to each other are formed in the surface protrusions or cores, whereby the profiles to be arranged side by side are fixed by placing the fixing bends against each other, adjacent profiles are fixed to each other by machine joining at the fixing bends arranged against each other. The method has simple process, but the honeycomb panel core plate structure is limited by the shape of the profile, so that the method is not flexible and the weight reduction effect is not obvious.
The Chinese patent with the issued publication number of CN 112966353A discloses a metal stainless steel gradient honeycomb core and a manufacturing method thereof, and the specific preparation method of the application is as follows: a metal stainless steel gradient honeycomb core comprises a plurality of honeycomb cells, wherein the interiors of the honeycomb cells are hollow, and the wall thickness of a side-along long-direction core plate is equal; the thickness of the honeycomb core plate is changed in a unidirectional positive gradient along the height direction. The application adopts the unidirectional positive gradient design or the symmetrical positive gradient design, which can well reduce the initial peak load of the honeycomb core when the honeycomb core is subjected to impact load, increase the energy absorption capacity and improve the safety of the honeycomb core. But this application relates to 3D printing processes, which have limited available materials compared to conventional processes, and the 3D printing uses high materials and equipment costs, longer production time, and poor mass productivity.
Disclosure of Invention
Aiming at the problems, the invention provides a structural design and a preparation process of a high-strength honeycomb plate.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The structural design of the high-strength honeycomb board comprises the high-strength honeycomb board, wherein the high-strength honeycomb board consists of an upper panel, a lower panel and a middle core board, the core boards are formed by connecting honeycomb shapes surrounded by variable-thickness boards, the edge thickness of each edge is changed regularly along the side length direction, the thickness near the middle part of each edge is the largest, and the thickness near the vertex of a hexagon is the smallest.
Preferably, the rule of variation of the edge thickness along the edge length direction corresponds to the following formula:
Where t is the thickness of the plate, x is the distance between any point on the edge and the vertex, t min is the thickness of the thinnest part of the thickened plate, t max is the thickness of the thickest part of the thickened plate, L is half the length of the edge, L 1 is the length of the thinnest part on one side of the edge, and L 2 is half the length of the thickest part of the edge.
Preferably, the structural design of the honeycomb panel is completed by determining t, tmin, tmax, L, L 1, L 2 and other specific structural parameters through the finite element simulation result of the impact process and combining the application requirements.
Preferably, the honeycomb panel raw material adopts GH3536 alloy, and the inner core raw material adopts 3003H18 aluminum alloy.
Preferably, when rolling the variable thickness plate, the roll gap is set according to the thickness change rule formula, and one change period length is set to be 2L.
Preferably, the thickness of the panel of the honeycomb board is in the range of 1mm-5mm, the thickness of the honeycomb board core board is in the range of 0.1mm-1mm, the edge length of the honeycomb units of the core board is in the range of 1mm-5mm, and the height is in the range of 1mm-5 mm.
Preferably, the honeycomb arrangement of the core plates is placed in a box-type atmosphere furnace with the temperature reaching 570 ℃ for heat preservation for 30min, the whole body can be taken out when the furnace temperature is reduced to about 400 ℃, and the core plates are placed in air for natural cooling to obtain the hexagonal aluminum honeycomb core structure.
Preferably, the brazing flux is Nocolok brazing flux, and KAlF4 is mainly used.
By adopting the technical scheme, the invention has the beneficial effects that: according to the invention, the mechanical properties of the honeycomb plate are obviously improved while the core material is not increased, so that the performances such as the compression resistance and the safety are effectively improved;
the high-strength honeycomb plate has the advantages that the strength at the node of the traditional honeycomb core is high, the strength at the edge is low, the failure is easy, the stress distribution of the inner core material is more reasonable when the honeycomb plate is stressed, the side surface of the honeycomb core which is easy to fail is reinforced, and the overall strength is improved;
the honeycomb core is produced by using a thickened plate on the basis of the traditional roll forming method, and is rolled by adopting a roll, so that the efficiency is high, and the shape accuracy is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only of the present invention, protecting some embodiments, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the production of a high strength honeycomb panel of the present invention;
FIG. 2 is a mises stress graph of a high strength honeycomb panel according to the present invention;
FIG. 3 is a mises stress graph of a conventional core plate equal thickness honeycomb panel;
FIG. 4 is a schematic cross-sectional view of a variable thickness plate according to the present invention;
fig. 5 is a schematic plan view of a high strength honeycomb core of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1
According to the process flow of fig. 1, a high-strength honeycomb board is prepared, the raw material of the honeycomb board panel is GH3536 alloy, the thickness is 1mm, the honeycomb board core board is made of 3003H18 aluminum alloy material with the thickness of 0.5mm, and the preparation method comprises the following steps:
S1) comparing the high-strength honeycomb board with a traditional honeycomb board structure by utilizing finite element software, establishing respective three-dimensional models, defining the properties of a panel and a core material, and enabling the parameters of the core board with equal thickness to be: 2l=2 mm, t=0.5 mm, h=4 mm, the thickened core parameters are: 2l=2 mm, h=4 mm, t min＝0.4mm、tmax＝0.6mm、L1 =0.3 mm and L 2 =0.3 mm ensure equal weights of the two structures; the panel raw material is GH3536 alloy, the Young modulus value is 205000MPa, and the Poisson ratio is 0.3; the honeycomb core is made of 3003H18 aluminum alloy, the Young modulus value of the honeycomb core is 70000MPa, and the Poisson ratio is 0.3; applying load to the surface of the vertical panel, performing impact process simulation, and ending the impact process when the thickness of the honeycomb plate is compressed to be 4 mm;
The simulation result shows that the maximum Mises stress value bearable by the high-strength honeycomb panel in the process reaches 2.374 X10 5 Pa, as shown in figure 2, the maximum Mises stress value is improved by 2.36× 4 Pa compared with the 2.138 × 5 Pa of the traditional honeycomb panel as shown in figure 3, the lifting effect is obvious, and the honeycomb core structure design is completed by adopting the following parameters: 2 l=2 mm, h=4 mm, t min＝0.4mm、tmax＝0.6mm、L1 =0.3 mm and L 2 =0.3 mm of the thick stock, as shown in fig. 4. The core structure is seen in top view in fig. 5 with cut panel dimensions of 20mm x 1mm;
s2) polishing, surface cleaning and the like are carried out on the cut raw materials;
s3) producing the periodic variable thickness core plate by using a variable roll gap rolling mode, wherein the thickness variation rule accords with the following formula:
Wherein t min＝0.4mm,tmax＝0.6mm,L＝1mm,L1＝0.3mm,L2 = 0.3mm;
S4) rolling and forming the core plate by utilizing rolling to obtain a corrugated strip plate composed of half-honeycomb structural units with thick edges and thin corners, wherein the side length of the corrugated strip plate is 2L=2mm;
s5) connecting a plurality of half honeycomb corrugated strips by adopting self-reaction brazing to obtain a core plate formed by tiling and arranging a plurality of honeycomb structures;
s6) adopting braze welding in a furnace to respectively connect the metal sheets at the upper end and the lower end of the honeycomb structure opening of the core plate to form a complete honeycomb plate structure.
In the description herein, reference to the terms "one embodiment," "example," "specific example," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (3)
1. A high strength honeycomb panel, characterized in that: the high-strength honeycomb plate consists of an upper panel, a lower panel and a middle core plate, wherein the core plates are formed by connecting honeycomb shapes surrounded by variable-thickness plates, the edge thickness of the honeycomb plate changes regularly along the side length direction, the thickness near the middle part of each side is the largest, and the thickness near the vertex of a hexagon is the smallest;
the change rule of the edge thickness along the edge length direction accords with the following formula:
Wherein t is the thickness of the plate, x is the distance between any point and the vertex on the edge, t min is the thickness of the thinnest part of the thickened plate, t max is the thickness of the thickest part of the thickened plate, L is half the length of the edge, L 1 is the length of the thinnest part on one side of the edge, and L 2 is half the length of the thickest part on the edge;
when the variable thick plate is rolled, the roll gap is set according to a thickness change rule formula, and the length of one change period is set to be 2L;
the preparation process of the high-strength honeycomb plate comprises the following steps of:
1) Selecting proper panel and core plate raw materials through finite element simulation in the impact process, and cutting the panel and the core plate raw materials into a certain size specification;
2) Polishing and surface cleaning are carried out on the cut raw materials;
3) Producing a periodical variable thickness core plate by utilizing a variable roll gap rolling mode;
4) Rolling the core plate by utilizing rolling to obtain a corrugated strip plate consisting of half honeycomb structural units with thick edges and thin corners;
5) Connecting a plurality of half honeycomb corrugated strips by adopting self-reaction brazing to obtain a core plate formed by tiling and arranging a plurality of honeycomb structures;
6) And brazing in a furnace is adopted to respectively connect the metal sheets at the upper end and the lower end of the honeycomb structure opening of the core plate to form a complete honeycomb plate structure.
2. A high strength honeycomb panel according to claim 1, wherein: and determining specific structural parameters of t, t min、tmax、L、L1 and L 2 by using a finite element simulation result of the impact process and combining application requirements, and completing structural design of the honeycomb panel.
3. A high strength honeycomb panel according to claim 1, wherein: the raw material of the honeycomb panel adopts GH3536 alloy, and the raw material of the inner core adopts 3003H18 aluminum alloy.
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