CN113910704A - Honeycomb core for active cooling structure and preparation method thereof - Google Patents

Honeycomb core for active cooling structure and preparation method thereof Download PDF

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Publication number
CN113910704A
CN113910704A CN202111169903.9A CN202111169903A CN113910704A CN 113910704 A CN113910704 A CN 113910704A CN 202111169903 A CN202111169903 A CN 202111169903A CN 113910704 A CN113910704 A CN 113910704A
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foil
honeycomb core
gluing
preparation
prefabricated body
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Chinese (zh)
Inventor
陈明
梁岳莹
胡正阳
丁宇升
宋鹏
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Aerospace Research Institute of Materials and Processing Technology
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Aerospace Research Institute of Materials and Processing Technology
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Priority to CN202111169903.9A priority Critical patent/CN113910704A/en
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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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • 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
    • B32B3/26—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 particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—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 particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/04—Punching, slitting or perforating
    • 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
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density

Abstract

The invention discloses a honeycomb core for an active cooling structure and a preparation method and application thereof. The preparation method comprises the steps of cutting of the foil, preparation of the laminated laying prefabricated body, preparation of the curing prefabricated body, preparation of the drilling prefabricated body, unfolding of the drilling prefabricated body and the like. The invention realizes the mutual communication among the closed honeycomb core cells by drilling holes on the side wall of the honeycomb core material, can realize the flow of a cooling medium in the honeycomb core when being applied to an active cooling structure, and achieves the effect of rapid cooling. The preparation method provided by the invention is simple in process, the problem of honeycomb core lattice closure is solved while the bearing capacity of the honeycomb structure is exerted, and the honeycomb core capable of being used for actively cooling the bearing structure is obtained.

Description

Honeycomb core for active cooling structure and preparation method thereof
Technical Field
The invention relates to the technical field of honeycomb cores, in particular to a honeycomb core for an active cooling structure, a preparation method thereof and application thereof in the active cooling structure, especially application in the manufacture of a sandwich structure with active cooling requirements.
Background
The honeycomb structure has excellent specific strength/rigidity, can meet larger load requirements with smaller weight, and can greatly reduce the self weight of the structure body. Meanwhile, the honeycomb structure has the advantages of good structural stability and good impact resistance and buffering performance.
The active cooling is a temperature control mode which utilizes a coolant to take away or separate heat and ensures that the temperature of the structure does not exceed an allowable value. Active cooling typically employs a hollow sandwich structure that provides a channel for the flow of coolant within the structure. Usually, the active cooling structure can meet certain structural bearing requirements, can meet corresponding temperature control effects, and has the structural function integration characteristic. The honeycomb core is used as a light high-strength material and can play a significant role in actively cooling the sandwich structure.
The regular hexagon structure adopted by the traditional honeycomb core is usually mutually independent, and the flow of active cooling medium in the honeycomb bearing structure, such as between core grids, cannot be directly realized. Moreover, the honeycomb structure is a weak rigid structure, and the difficulty of processing the honeycomb structure after the honeycomb structure is unfolded is high, and if communication is formed between core grids, holes can be punched only near two ends of a honeycomb pore channel. The invention provides a preparation method which can realize the mutual communication of core cells while forming a honeycomb core, so that the honeycomb core can be used for an active cooling structure.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides, in a first aspect, a method for manufacturing a honeycomb core for an active cooling structure, characterized by comprising the steps of:
(1) cutting the foil: cutting the foil according to the required size and number for subsequent layup;
(2) preparation of a lay-up preform: gluing the first layer of foil material from the edge position by using an adhesive, wherein the gluing width W is the length of the single-time honeycomb core lattice side, and the gluing distance L is three times of the length of the honeycomb core lattice side; laying a second foil on the first foil in a laminated manner in alignment with the edge position of the first foil and gluing the second foil and the first foil together; gluing the second layer of foil at a position 2W away from the edge by the gluing width W and the gluing interval L; gluing the foils with odd layers according to a first layer mode, gluing the foils with even layers according to a second layer mode, sequentially laying in a laminated mode and gluing the foils to the expected number of layers to obtain a laminated laying prefabricated body;
(3) preparation of a cured preform: carrying out hot-pressing curing on the laminated laying prefabricated body to obtain a cured prefabricated body;
(4) preparing a drilling preform: drilling the non-adhesive surface of the cured preform to obtain a drilled preform;
(5) unfolding the drilling prefabricated body: and stretching and unfolding the drilling prefabricated body to obtain the honeycomb core.
The present invention provides, in a second aspect, a honeycomb core produced by the production method according to the first aspect of the present invention.
Compared with the prior art, the invention has the following technical effects:
(1) the preparation method of the invention has simple process, and can realize the perforation of a plurality of rows of honeycomb channels before the honeycomb channels are unfolded.
(2) The preparation method of the invention can realize uniform punching of the honeycomb channel wall and can realize higher compression strength under the condition of the same punching rate.
(3) The honeycomb channel can be perforated not only at the ends thereof but also at the middle thereof, and can have a significantly lower density while achieving the same compressive strength.
(4) The preparation method of the invention can solve the problem of honeycomb core lattice closure while exerting the bearing capacity of the honeycomb structure, and obtains the honeycomb core which can be used for actively cooling the bearing structure.
(5) The honeycomb core prepared by the preparation method has the advantages of high compression strength, low density, good cooling effect and the like when being used for actively cooling a bearing structure.
Drawings
Fig. 1 shows a process flow diagram of a method of the present invention for making a honeycomb core for an active cooling structure.
Figure 2 shows a perforated schematic (partial interface schematic) of one embodiment of the honeycomb core of the present invention for an active cooling structure.
Figure 3 shows a schematic view (partially cross-sectional view) of one embodiment of the honeycomb core for an active cooling structure of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described more clearly and completely in conjunction with the specific embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.
Referring now to fig. 1, there is shown a process flow diagram illustrating a method of making a honeycomb core for an actively cooled structure of the present invention. The preparation method comprises 5 steps of cutting the foil, preparing the laminated laying prefabricated body, preparing the curing prefabricated body, preparing the drilling prefabricated body and unfolding the drilling prefabricated body. The honeycomb core was thus produced through the above 5 steps.
Specifically, as described above, the present invention provides in a first aspect a method for producing a honeycomb core for an active cooling structure, the method comprising the steps of:
(1) cutting the foil: cutting the foil according to the required size and number for subsequent layup;
(2) preparation of a lay-up preform: gluing the first layer of foil material from the edge position by using an adhesive, wherein the gluing width W is the length of the single-time honeycomb core lattice side, and the gluing distance L is three times of the length of the honeycomb core lattice side; laying a second foil on the first foil in a laminated manner in alignment with the edge position of the first foil and gluing the second foil and the first foil together; gluing the second layer of foil at a position 2W away from the edge by the gluing width W and the gluing interval L; gluing the foils with odd layers according to a first layer mode, gluing the foils with even layers according to a second layer mode, sequentially laying in a laminated mode and gluing the foils to the expected number of layers to obtain a laminated laying prefabricated body;
(3) preparation of a cured preform: carrying out hot-pressing curing on the laminated laying prefabricated body to obtain a cured prefabricated body;
(4) preparing a drilling preform: drilling the non-adhesive surface of the cured preform to obtain a drilled preform;
(5) unfolding the drilling prefabricated body: and stretching and unfolding the drilling prefabricated body to obtain the honeycomb core.
In step (1), the present invention is not particularly limited to the foil. In some preferred embodiments, however, the foil material is selected from one or more of the group consisting of aluminum alloys, titanium alloys, and stainless steel.
Additionally, in some preferred embodiments, the foil may have a thickness of 0.03mm to 0.1mm, such as 0.04, 0.05, 0.06, 0.07, 0.08, or 0.09 mm.
In the step (2), the present invention is not particularly limited to the adhesive. In some preferred embodiments, however, the adhesive used for the coating is selected from one or more of epoxy resins, bismaleimide resins and polyimide resins.
In the step (2), gluing is carried out by using an adhesive from the edge position of the first layer of foil, wherein the gluing width W is the side length of the single-unit honeycomb core lattice, and the gluing distance L is three times of the side length of the honeycomb core lattice.
Reference is now made to fig. 2 and 3.
Reference is first made to fig. 2. Several regions, repeating units consisting of regions a, b, c and d are shown in FIG. 2. The area a is an adhesive surface with a width W; the widths of zone b, zone c and zone d are each equal to 3 consecutive non-adhesive faces of W, so the sum of the widths of these three non-adhesive faces is 3W. Therefore, the first layer of foil is coated with glue starting from the edge position of the foil, with a glue width W (single honeycomb core lattice side length) and a glue pitch L (three honeycomb core lattice side lengths).
The honeycomb core of the present invention is used for an active cooling structure, and the honeycomb core is composed of a plurality of channels having a regular hexagonal cross section, in other words, the cross section of the honeycomb core is composed of a plurality of regular hexagons. The side length of the regular hexagon is the honeycomb core lattice side length, which corresponds to the width W of regions a, b, c and d in fig. 2 or the width of regions 1, 2, 3 or 4 in fig. 3.
See then fig. 2. In step (2), the second foil is laid on top of the first foil in a stack aligned with the edge position of the first foil and glued together, as shown in fig. 2, the second foil is laid on top of the first foil in a stack aligned with the edge of the area 1 of the first foil and 3' of the second foil and glued together. Glue is applied starting from the position of the second layer of foil from the edge 2W, i.e. the sum of the widths of the areas 3 'and 4', with said glue application width W (corresponding to the width of the area 1 ') and glue application distance L (corresponding to the sum of the widths of the areas 2', 3 'and 4'). And gluing the foils with odd layers according to the mode of the first layer, gluing the foils with even layers according to the mode of the second layer, sequentially laying in a laminated mode and gluing to the expected number of layers to obtain the laminated laying prefabricated body.
In the step (3), the curing pressure of the hot press curing is preferably 0.2 to 1.0MPa, for example, 0.4, 0.6 or 0.8 MPa. Alternatively or further preferably, the curing temperature of the hot press curing is 130 ℃ to 280 ℃, for example 150, 200 or 250 ℃. Alternatively or further preferably, the curing time of the hot press curing is 120min to 240min, for example 150, 180 or 210 min.
In the step (4), it is preferable that the perforation pitch G of the perforations is 2mm to 4mm, for example, 3mm, and the diameter D of the holes to be formed is 2mm to 4mm, for example, 3 mm. It is additionally or further preferred that the glue width W is 1mm to 10mm, for example 2, 3, 4, 5, 6, 7, 8 or 9 mm. If the perforation spacing is too large or the pore size is too small, the flow of the active cooling medium between the lattice channels of the honeycomb core may not be as sufficient and result in an excessive overall density of the honeycomb core. If the perforation pitch is too small or the pore diameter is too large, the overall strength of the honeycomb core may not be particularly large.
The hole diameter D and the perforation distance G can be seen in FIG. 2, the hole diameter is the diameter of the drilled hole; the punching pitch is the length of the center-connecting line of two adjacent holes minus the distance from each of the two end points of the center-connecting line to the position where the center-connecting line intersects the boundary of the hole with the corresponding end point as the center, in other words, the punching pitch is the distance between two points where the center-connecting line of two adjacent holes intersects the edge line of the two holes (see fig. 2).
Referring now to fig. 2, in the repeating unit consisting of regions a, b, c and d, region a is the adhesive side and regions b, c and d are 3 non-adhesive sides. With additional reference to fig. 3, the first layer of foil comprises repeating units of regions 1, 2, 3 and 4, region 1 being the adhesive side and regions 2, 3 and 4 being the non-adhesive side; the second layer of foil comprises repeating units of regions 1', 2', 3 'and 4', region 1 'being the adhesive side and regions 2', 3 'and 4' being the non-adhesive side. When a second foil is overlaid on the first foil in a mode of aligning with the edge position of the first foil and is glued together, a gluing surface area 1 of the first foil is glued together with a non-gluing surface area 3 'of the second foil, and areas 2, 3 and 4 of the first foil are respectively opposite to areas 4', 1 'and 2' of the second foil and form a regular hexagonal crystal lattice.
See fig. 2. In the case of perforation, for a single repeating unit, the area b and/or the area d of the 3 non-adhesive surface areas b, c and d is/are perforated, the remaining area c being intended to be glued together with the adhesive surface of the foil layer on the other side. With additional reference to fig. 3, the first layer of foil comprises repeating units of areas 1, 2, 3 and 4, area 1 being the adhesive side and areas 2, 3 and 4 being the non-adhesive side, and during punching only one of the areas 2 and 4 may be punched, or both areas 2 and 4 may be punched simultaneously, i.e. one or both of the areas 2 and 4 of the non-adhesive side adjacent to the area being the adhesive side is selected for punching. The punching is usually to punch a through hole in a non-gluing area of the cured preform, so that holes can be punched in corresponding areas of the multilayer foil of the cured preform before the cured preform is unfolded, the punching is easy to operate, the multilayer foil is processed in batch, and the efficiency of punching operation is obviously improved. For example, if the area 2 is perforated, the area 4' corresponding to the area 2 and the corresponding areas of the other layers of foil will also be perforated with corresponding holes; similarly, if the area 4 is perforated, the area 2' corresponding to the area 4 and the corresponding area of the other layer of foil will also be perforated with corresponding holes.
In some embodiments, the preparation method of the present invention comprises the following steps:
(1) core layer cutting
Selecting a foil material such as a metal foil material, and cutting the foil material into the same size according to the required size and quantity for later use, wherein the foil material is selected from one or more of aluminum alloy, titanium alloy and stainless steel; more preferably, the thickness of the foil is 0.03-0.1 mm.
(2) Preparation of a lay-up preform: gluing the first layer of foil material from the edge position by using an adhesive, wherein the gluing width W is the length of the single-time honeycomb core lattice side, and the gluing distance L is three times of the length of the honeycomb core lattice side; laying a second foil on the first foil in a laminated manner in alignment with the edge position of the first foil and gluing the second foil and the first foil together; gluing the second layer of foil at a position 2W away from the edge by the gluing width W and the gluing interval L; gluing the foils with odd layers according to a first layer mode, gluing the foils with even layers according to a second layer mode, sequentially laying in a laminated mode and gluing the foils to the expected number of layers to obtain a laminated laying prefabricated body; wherein the adhesive is selected from one or more of epoxy resin, bismaleimide resin and polyimide resin.
(3) Preparation of a cured preform: after the foil is laid in a laminated manner, the foil is placed into a hot press for high-temperature and high-pressure curing, wherein the curing pressure is 0.2MPa to 1.0MPa, the curing temperature is 130 ℃ to 280 ℃, and the curing time is 120min to 240 min.
(4) Preparing a drilling preform: after foil solidification is finished, drilling two non-adhesive surfaces adjacent to the adhesive surface in the non-adhesive surfaces of the honeycomb core by using a numerical control milling machine, wherein the diameter of each drilled hole is 2-4 mm, and the pitch of the holes is 2-4 mm;
(5) unfolding the drilling prefabricated body: and after drilling is finished, the stretching machine is utilized to finish the unfolding of the foil, and the honeycomb core capable of being used for actively cooling the bearing structure is prepared.
The present invention provides, in a second aspect, a honeycomb core produced by the production method according to the first aspect of the present invention.
In some preferred embodiments, the honeycomb core has a density of no greater than 100kg/m3(ii) a The compressive strength is not less than 2.5 MPa; it is further preferred that the honeycomb core has a density of not more than 75kg/m3For example, not more than 62kg/m3(ii) a The compressive strength is not less than 2.8MPa, for example, not less than 3.0 MPa.
The invention discloses a honeycomb core for an active cooling bearing structure, and a preparation method and application thereof. The preparation method has the main advantages that the preparation process is simple, the problem of honeycomb core lattice closure is solved while the bearing capacity of the honeycomb structure is exerted, and the honeycomb core capable of being used for actively cooling the bearing structure is obtained.
The invention will now be further illustrated by the following examples, which are given for the purpose of illustration only and the scope of the invention is not limited thereto.
Example 1
According to the process flow chart shown in fig. 1, the preparation of the aluminum honeycomb core with the core grid side length of 5mm for the active cooling bearing structure is completed, and the process comprises the following steps:
the method comprises the following steps: cutting of foils
Cutting an aluminum alloy foil into foils with the same size for later use, wherein the aluminum alloy foil is provided with the mark of 5A02, the thickness of 0.1mm and the size of 20mm 1000mm (the size is adopted in all the examples and the comparative examples);
step two: preparation of a lay-up preform
Gluing the first layer of aluminum alloy foil from the edge position by using an adhesive, wherein the gluing width is 5mm, the gluing interval is 15mm, the second layer of aluminum alloy foil is aligned with the edge position of the first layer, and the second layer of aluminum alloy foil is laid on the first layer of aluminum alloy foil and glued together; gluing the second layer of aluminum alloy foil 10mm away from the edge, wherein the gluing width is 5mm, and the gluing interval is 15 mm; and gluing odd layers of aluminum alloy foils according to a first layer mode, gluing even layers of aluminum alloy foils according to a second layer mode, and repeating the steps to complete the laminated laying of the aluminum alloy foils, wherein the number of the layers is 30, and obtaining a laminated laying prefabricated body, wherein the used adhesive is epoxy resin.
Step three: preparation of cured preforms
And (3) placing the laminated laying prefabricated body into a hot press for high-temperature and high-pressure curing to obtain a cured prefabricated body, wherein the curing pressure is 0.4MPa, the curing temperature is 160 ℃, and the curing time is 150 min.
Step four: after the preparation and curing of the drilling preform are finished, drilling is carried out on the non-adhesive surfaces (two non-adhesive surfaces of the adhesive surface and the middle of the two non-adhesive surfaces which are separated by a non-adhesive surface with the same width) of the cured preform obtained by curing by using a numerical control milling machine to obtain the drilling preform, wherein the drilling hole distance is 2.5mm, and the diameter of the formed round hole is 3 mm.
Step five: expansion of a drill preform
After drilling is finished to obtain a drilling prefabricated body, the aluminum alloy foil is unfolded by utilizing a stretcher to obtain an aluminum honeycomb core capable of being used for actively cooling the bearing structure, and the density of the aluminum honeycomb core is about 65kg/m3And the compressive strength is more than 2.5 MPa.
Example 2
According to the process flow chart shown in fig. 1, the preparation of the titanium honeycomb core with the core lattice side length of 5mm for the active cooling bearing structure is completed, and the process comprises the following steps:
the method comprises the following steps: core layer cutting
Cutting the titanium alloy foil into the same size for later use, wherein the grade of the titanium alloy foil is TA1, and the thickness of the titanium alloy foil is 0.06 mm;
step two: preparation of a lay-up preform
Gluing the first layer of titanium alloy foil from the edge position by using an adhesive, wherein the gluing width is 5mm, the gluing interval is 15mm, the second layer of titanium alloy foil is aligned with the edge position of the first layer, and the second layer of titanium alloy foil is laid on the first layer of titanium alloy foil and glued together; gluing the second layer of titanium alloy foil 10mm away from the edge, wherein the gluing width is 5mm, and the gluing interval is 15 mm; and gluing odd layers of titanium alloy foils according to a first layer mode, gluing even layers of titanium alloy foils according to a second layer mode, and repeating the steps to complete the laminated laying of the titanium alloy foils, wherein the number of layers is 30, and obtaining a laminated laying prefabricated body, wherein the used adhesive is bismaleimide resin.
Step three: preparation of cured preforms
And (3) placing the laminated laying prefabricated body into a hot press for high-temperature and high-pressure curing to obtain a cured prefabricated body, wherein the curing pressure is 0.5MPa, the curing temperature is 240 ℃, and the curing time is 240 min.
Step four: preparation of a drill preform
After the solidification is finished, drilling is carried out on the non-adhesive surfaces (two non-adhesive surfaces with the same width as the adhesive surface and the middle of the two non-adhesive surfaces) of the solidified prefabricated body obtained by solidification by using a numerical control milling machine, and the drilled prefabricated body is obtained, wherein the hole distance of the drilled holes is 2.5mm, and the diameter of the formed round hole is 3 mm.
Step five: expansion of a drill preform
After drilling is finished to obtain a drilling prefabricated body, the titanium alloy foil is unfolded by utilizing a stretcher to obtain a titanium honeycomb core capable of being used for actively cooling the bearing structure, and the density of the titanium honeycomb core is about 62kg/m3And the compressive strength is more than 3.0 MPa.
Example 3
According to the process flow chart shown in fig. 1, the preparation of the stainless steel honeycomb core with the core grid side length of 4mm for the active cooling bearing structure is completed, and the process comprises the following steps:
the method comprises the following steps: core layer cutting
Cutting a stainless steel foil into the same size for later use, wherein the mark of the stainless steel foil is 316L, and the thickness of the stainless steel foil is 0.03 mm;
step two: preparation of a lay-up preform
Gluing the edge of the first layer of stainless steel foil by using an adhesive, wherein the gluing width is 4mm, the gluing interval is 12mm, the edge of the second layer of stainless steel foil is aligned with the edge of the first layer, and the second layer of stainless steel foil is laid on the first layer of stainless steel foil and glued together; gluing the second layer of stainless steel foil at a position 8mm away from the edge, wherein the gluing width is 4mm, and the gluing interval is 12 mm; and gluing odd layers of stainless steel foils according to a first layer mode, gluing even layers of stainless steel foils according to a second layer mode, and repeating the steps to complete the laminated laying of the stainless steel foils, wherein the number of the layers is 30, and thus obtaining a laminated laying prefabricated body, wherein the used adhesive is polyimide resin.
Step three: preparation of cured preforms
And (3) placing the laminated laying prefabricated body into a hot press for high-temperature and high-pressure curing to obtain a cured prefabricated body, wherein the curing pressure is 0.8MPa, the curing temperature is 200 ℃, and the curing time is 180 min.
Step four: preparation of a drill preform
After the solidification is finished, drilling is carried out on the non-adhesive surfaces (two non-adhesive surfaces with the same width as the adhesive surface and the middle of the two non-adhesive surfaces) of the solidified prefabricated body obtained by solidification by using a numerical control milling machine, and the drilled prefabricated body is obtained, wherein the hole pitch of the drilled holes is 2.5mm, and the diameter of the formed round hole is 3 mm.
Step five: expansion of a drill preform
After drilling is finished to obtain a drilling prefabricated body, the stainless steel foil is unfolded by utilizing a stretcher to obtain a stainless steel honeycomb core capable of being used for actively cooling the bearing structure, and the density of the stainless steel honeycomb core is about 68kg/m3And the compressive strength is more than 2.5 MPa.
Example 4
The procedure was carried out in substantially the same manner as in example 1 except that the punching treatment was carried out on only one of the two non-adhesive faces to the adhesive face.
Comparative example 1
The procedure was carried out in substantially the same manner as in example 1 except that the hole pitch was 1mm and the hole diameter was 5 mm.
Comparative example 2
The procedure was carried out in substantially the same manner as in example 1, except that the drilling treatment was carried out only in the region where the non-adhesive surface was 6mm from the edge, at the indicated hole pitch and hole diameter.
Comparative example 3
This was carried out in substantially the same manner as in example 1 except that the punching treatment was not carried out.
TABLE 1 Properties of honeycomb cores obtained in examples and comparative examples
Examples Density (kg/m)3) Compressive Strength (MPa) Fluidity of the coolant
Example 1 65 2.5 Superior food
Example 2 62 3.0 Superior food
Example 3 68 2.5 Superior food
Example 4 75 2.8 In
Comparative example 1 60 1.3 Superior food
Comparative example 2 78 2.6 In
Comparative example 3 85 3.2 Is not flowable
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: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method of making a honeycomb core for an active cooling structure, the method comprising the steps of:
(1) cutting the foil: cutting the foil according to the required size and number for subsequent layup;
(2) preparation of a lay-up preform: gluing the first layer of foil material from the edge position by using an adhesive, wherein the gluing width W is the length of the single-time honeycomb core lattice side, and the gluing distance L is three times of the length of the honeycomb core lattice side; laying a second foil on the first foil in a laminated manner in alignment with the edge position of the first foil and gluing the second foil and the first foil together; gluing the second layer of foil at a position 2W away from the edge by the gluing width W and the gluing interval L; gluing the foils with odd layers according to a first layer mode, gluing the foils with even layers according to a second layer mode, sequentially laying in a laminated mode and gluing the foils to the expected number of layers to obtain a laminated laying prefabricated body;
(3) preparation of a cured preform: carrying out hot-pressing curing on the laminated laying prefabricated body to obtain a cured prefabricated body;
(4) preparing a drilling preform: drilling the non-adhesive surface of the cured preform to obtain a drilled preform;
(5) unfolding the drilling prefabricated body: and stretching and unfolding the drilling prefabricated body to obtain the honeycomb core.
2. The method of claim 1, wherein the foil is made of a material selected from one or more of aluminum alloy, titanium alloy, and stainless steel.
3. The method of claim 1, wherein the foil has a thickness of 0.03mm to 0.1 mm.
4. The method according to claim 1, wherein the adhesive is one or more selected from the group consisting of epoxy resin, bismaleimide resin, and polyimide resin.
5. The method of claim 1, wherein:
the curing pressure of the hot-pressing curing is 0.2MPa to 1.0 MPa;
the curing temperature of the hot-pressing curing is 130-280 ℃; and/or
The curing time of the hot-pressing curing is 120-240 min.
6. The method of claim 1, wherein:
the punching distance G of the punching is 2-4 mm; and/or
The aperture D of the formed hole is 2 mm-4 mm.
7. The production method according to claim 1, wherein the glue width W is 1mm to 10 mm.
8. The honeycomb core produced by the production method according to any one of claims 1 to.
9. The honeycomb core of claim 8, wherein the honeycomb core has a density of no greater than 100kg/m3。
10. The honeycomb core according to claim 8 or 9, wherein the honeycomb core has a compressive strength of not less than 2.5 MPa.
CN202111169903.9A 2021-10-08 2021-10-08 Honeycomb core for active cooling structure and preparation method thereof Pending CN113910704A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009002575A (en) * 2007-06-21 2009-01-08 Fujikake Planning Co Ltd Honeycomb panel and manufacturing method for it
CN203077702U (en) * 2013-01-28 2013-07-24 苏州芳磊蜂窝复合材料有限公司 Perforating paper honeycomb core
CN111231428A (en) * 2019-12-13 2020-06-05 中航复合材料有限责任公司 Preparation method of high-density energy-absorbing aluminum honeycomb core material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009002575A (en) * 2007-06-21 2009-01-08 Fujikake Planning Co Ltd Honeycomb panel and manufacturing method for it
CN203077702U (en) * 2013-01-28 2013-07-24 苏州芳磊蜂窝复合材料有限公司 Perforating paper honeycomb core
CN111231428A (en) * 2019-12-13 2020-06-05 中航复合材料有限责任公司 Preparation method of high-density energy-absorbing aluminum honeycomb core material

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Application publication date: 20220111