Composite material sandwich panel

Abstract

The utility model relates to the technical field of composite material processing and preparation, and particularly discloses a composite material sandwich board. The sandwich board comprises bolts, an outer laying layer, a sandwich layer and an inner laying layer, the outer laying layer, the sandwich layer and the inner laying layer are sequentially stacked from top to bottom, the sandwich layer comprises a structural layer board and a filling layer board arranged on the lower side of the structural layer board, the structural layer board is provided with weight reduction through holes in a penetrating mode, and the filling layer board comprises a board body and a plurality of penetrating connection bosses arranged on the upper board face of the board body in a protruding mode. Penetrating through holes are formed in the structural layer plate in a penetrating mode, the number of the penetrating through holes is the same as that of the penetrating bosses, each penetrating boss is inserted into one penetrating through hole in a matched mode, positioning grooves are formed in the inner laying layer in a concave mode, the positioning grooves are filled with the plate body, and the number of the bolts is the same as that of the penetrating bosses. And each bolt sequentially penetrates through the outer paving layer, the penetrating boss and the inner paving layer from top to bottom. According to the sandwich board, due to the design that the bosses are embedded into the structural laminates, the torsional force and the thrust can be uniformly dispersed to the structural laminates and the inner and outer laying layers, so that the local strength and the local rigidity are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to composite material processing preparation technical field especially relates to composite material sandwich panel. BACKGROUND

[0002] Sandwich structure is a kind of composite material consisting of core, upper and lower panel and the interface between core and upper and lower, due to its own performance characteristics such as lightweight, high specific stiffness, large specific strength, good machinability and easy to highlight combination advantage, makes it play a very important role in the field such as automobile, shipbuilding and aerospace.

[0003] In prior art, the mounting plate of motor adopts sandwich structure of composite material based on the consideration of weight reduction.When the mounting plate is used to install high-vibration and large-thrust motor, if structural laminate is used as sandwich material of composite material, there will be the problem of insufficient normal stiffness, and it is difficult to bear the concentrated stress and alternating thrust of motor bolt locking;If aluminum alloy plate or high-strength carbon fiber plate is used as embedded sandwich plate material, there will be certain disadvantage in weight.

[0004] Therefore, there is an urgent need for a composite material plate combining structural laminate and aluminum alloy composite structure as sandwich material, which can bear the locking force and alternating force of motor fixing bolt, and at the same time, the weight is more advantageous compared with pure aluminum alloy or carbon fiber laminate as sandwich plate material. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing composite material sandwich panel, realizes the improvement of light weight under the premise of guaranteeing self structure strength.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] The composite material sandwich panel includes bolt and external layer, sandwich layer and internal layer stacked from top to bottom, the sandwich layer includes structural laminate and filling layer plate arranged on the lower side of the structural laminate, the structural laminate is penetrated by weight reduction through hole, the filling layer plate includes plate main body and a plurality of penetrating bosses arranged on the plate surface of the plate main body, the structural laminate is penetrated by penetrating through hole, the number of penetrating through hole and penetrating boss is same, and each penetrating boss is matched and inserted into one penetrating through hole, the internal layer is recessed with positioning groove, the plate main body fills the positioning groove, the number of bolt and penetrating boss is same, and each bolt penetrates the external layer, penetrating boss and internal layer from top to bottom.

[0008] As an optional technical scheme of composite material sandwich panel, the external layer, the structural laminate, the plate main body and internal layer are all circular plates, and the axis of the plate main body and the structural laminate is coincident.

[0009] As an optional technical solution of the composite sandwich panel, all the through holes are uniformly distributed around the axis of the structural layer plate.

[0010] As an optional technical solution of the composite sandwich panel, the weight-reducing through hole comprises a central through hole, and an axis of the central through hole coincides with an axis of the structural layer plate.

[0011] As an optional technical solution of the composite sandwich panel, the weight-reducing through hole comprises a plurality of arc-shaped through holes, and all the arc-shaped through holes are uniformly distributed around the axis of the structural layer plate.

[0012] As an optional technical solution of the composite sandwich panel, a first structural adhesive layer is arranged between the plate body and the structural layer plate, and the first structural adhesive layer is used for adhesively connecting the plate body and the structural layer plate; and / or, a second structural adhesive layer is arranged between the outer layer and the structural layer plate, and the second structural adhesive layer is used for adhesively connecting the outer layer and the structural layer plate; and / or, a third structural adhesive layer is arranged between the inner layer and the structural layer plate, and the third structural adhesive layer is used for adhesively connecting the inner layer and the structural layer plate.

[0013] As an optional technical solution of the composite sandwich panel, the through-protrusion is provided with a threaded through hole, and an inner thread is arranged on a hole wall of the threaded through hole.

[0014] As an optional technical solution of the composite sandwich panel, the material of the structural layer plate is an aviation layer plate.

[0015] As an optional technical solution of the composite sandwich panel, the material of the filling layer plate is an aluminum alloy.

[0016] As an optional technical solution of the composite sandwich panel, the thickness of the inner layer is uniform.

[0017] The composite sandwich panel has the following beneficial effects:

[0018] The composite sandwich panel improves the sandwich layer, adopts the design of embedding the through-protrusion into the structure layer plate and filling the positioning groove in the plate main body, ensures the stable installation of the filling layer plate in the composite sandwich panel, realizes the stable connection between the layers, and ensures the overall structural stability and durability; the design of matching the through-protrusion with the through hole and the design of filling the positioning groove in the plate main body ensure the accurate installation of the composite sandwich panel, realize the simplification of the overall structure, ensure the accurate cutting and fitting between the plate surfaces, and are favorable for the smooth completion of the subsequent vacuumizing operation. The above-mentioned optimization design strengthens the strength and normal rigidity of the composite sandwich panel, improves the torsional resistance, is reasonable in design and superior in performance, has the advantages of firm connection, stable structure, high strength, light weight, and aesthetic and practical, is applicable to various complex environments and application scenarios, and has wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the composite sandwich plate in the first perspective view according to an embodiment of the present utility model;

[0020] Figure 2 is an exploded view of the composite sandwich plate in the first perspective view according to an embodiment of the present utility model;

[0021] Figure 3 is a structural schematic view of the composite sandwich plate in the second perspective view according to an embodiment of the present utility model;

[0022] Figure 4 is an exploded view of the composite sandwich plate in the second perspective view according to an embodiment of the present utility model;

[0023] Figure 5 is a sectional view of the composite sandwich plate according to an embodiment of the present utility model.

[0024] In the drawings:

[0025] 100, external layer; 101, first through hole;

[0026] 200, structure layer plate; 201, through hole; 202, arc-shaped through hole; 203, central through hole;

[0027] 300, filling layer plate; 310, through-protrusion; 311, threaded through hole; 320, plate main body;

[0028] 400, internal layer; 401, second through hole; 402, positioning groove. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature on the second feature include the "above" and "oblique above" of the first feature on the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature on the second feature include the "below" and "oblique below" of the first feature on the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0033] As Figures 1 to 5As shown, the embodiment provides a composite sandwich panel, which comprises a bolt and an external layer 100, a sandwich layer and an internal layer 400 stacked in sequence from top to bottom, the sandwich layer comprises a structural layer 200 and a filling layer 300 arranged on the lower side of the structural layer 200, the structural layer 200 is provided with a weight-reducing through hole, the filling layer 300 comprises a plate body 320 and a plurality of penetrating bosses 310 protruding on the plate surface of the plate body 320, the structural layer 200 is provided with a penetrating through hole 201, the number of the penetrating through hole 201 is the same as that of the penetrating boss 310, and each penetrating boss 310 is matched and inserted into one penetrating through hole 201, the internal layer 400 is recessed with a positioning groove 402, the plate body 320 fills the positioning groove 402, the number of the bolt is the same as that of the penetrating boss 310, and each bolt penetrates the external layer 100, the penetrating boss 310 and the internal layer 400 in sequence from top to bottom.

[0034] The composite sandwich panel improves the sandwich layer, adopts the design of embedding the penetrating boss 310 into the structural layer 200 and filling the plate body 320 into the positioning groove 402, ensures the stable installation of the filling layer 300 in the composite sandwich panel, realizes the stable connection between the layers, ensures the overall structural stability and durability, cooperates with the design of the bolt penetrating the penetrating boss 310, enables the external equipment to be fixed in position with the filling layer 300 through the bolt, so that the torsional force and the thrust force transmitted by the external equipment can be uniformly dispersed on the structural layer 200, the external layer 100 and the internal layer 400, thereby improving the local strength and local stiffness of the composite sandwich panel. At the same time, with the design of matching and inserting the penetrating boss 310 into the penetrating through hole 201 and filling the plate body 320 into the positioning groove 402, the accurate installation of the composite sandwich panel is ensured, the overall structure is simplified, the accurate cutting and fitting between the plate surfaces are ensured, and the subsequent vacuum operation is smoothly completed. The above optimization design strengthens the strength and normal stiffness of the composite sandwich panel, improves the torsional resistance, is reasonable in design and superior in performance, has the advantages of firm connection, stable structure, high strength, light weight and aesthetic and practical use, is suitable for various complex environments and application scenarios, and has a broad application prospect.

[0035] Compared with the aluminum alloy or composite aluminum alloy / carbon fiber layer sandwich panel, the composite sandwich panel optimized by the above design has great lightweight advantage; compared with the composite aviation layer sandwich panel, the bolt cannot be locked due to insufficient stiffness of the composite sandwich panel, or the sandwich layer is crushed and cracked due to too much locking force of the bolt, and the torsional force transmitted by the external equipment will not cause the opening of the composite sandwich panel to be severely worn in the long-term use.

[0036] In the embodiment, the external equipment is a motor, and the output end of the motor is fixed to the filling layer 300 by the bolt.

[0037] In the embodiment, the outer ply 100, the structural laminate 200, the plate body 320 and the inner ply 400 are all circular plates, and the axis of the plate body 320 coincides with that of the structural laminate 200.

[0038] The above design makes the composite sandwich plate have high symmetry and overall stability, improves the strength and rigidity of the overall structure, reduces the risk of stress concentration, and also makes the overall structure more compact, the weight distribution uniform, and the overall stability and load-bearing capacity improved, so as to adapt to various circular structure application scenarios.

[0039] Further, all the through holes 201 are uniformly distributed around the axis of the structural laminate 200.

[0040] The above design makes the composite sandwich plate realize uniform stress distribution when bearing external force, so as to be less prone to local deformation, which is beneficial to maintaining structural integrity, ensuring fatigue resistance and torsion resistance, and improving the overall load-bearing capacity and stability.

[0041] Illustratively, the weight-reducing through hole includes a central through hole 203, and the axis of the central through hole 203 coincides with that of the structural laminate 200.

[0042] The introduction of the central through hole 203 significantly reduces the weight of the composite sandwich plate while maintaining the rigidity, strength and stability of the structure, improves the material utilization efficiency, and is beneficial to reducing the material cost and improving the use convenience.

[0043] In the embodiment, the weight-reducing through hole includes a plurality of arc-shaped through holes 202, and all the arc-shaped through holes 202 are uniformly distributed around the axis of the structural laminate 200.

[0044] The design of the arc-shaped through hole 202 not only provides a weight-reducing effect for the composite sandwich plate, but also enhances the bending performance and processability of the overall structure, so that it can adapt to more complex mechanical environments while maintaining strength.

[0045] In one embodiment of the embodiment, a first structural adhesive layer is arranged between the plate body 320 and the structural laminate 200, and is used to adhesively connect the plate body 320 and the structural laminate 200; a second structural adhesive layer is arranged between the outer ply 100 and the structural laminate 200, and is used to adhesively connect the outer ply 100 and the structural laminate 200; and a third structural adhesive layer is arranged between the inner ply 400 and the structural laminate 200, and is used to adhesively connect the inner ply 400 and the structural laminate 200.

[0046] The first structural adhesive layer, the second structural adhesive layer and the third structural adhesive layer are arranged to enhance the connection strength and sealing performance between the layers, improve the overall stability and durability of the composite sandwich panel, and help prolong the service life.

[0047] In other embodiments of the present embodiment, the connection mode between the structural layer plate 200 and the plate body 320, the outer ply 100 and the inner ply 400 is that any one of the following three or a combination of any two of the following three is adopted: a first structural adhesive layer is arranged between the plate body 320 and the structural layer plate 200, and the first structural adhesive layer is used to bond and fix the plate body 320 and the structural layer plate 200; a second structural adhesive layer is arranged between the outer ply 100 and the structural layer plate 200, and the second structural adhesive layer is used to bond and fix the outer ply 100 and the structural layer plate 200; and a third structural adhesive layer is arranged between the inner ply 400 and the structural layer plate 200, and the third structural adhesive layer is used to bond and fix the inner ply 400 and the structural layer plate 200. The connection mode between the structural layer plate 200 and the plate body 320, the outer ply 100 and the inner ply 400 is determined by a person skilled in the art according to engineering practice, and the specific determination mode is a common knowledge in the art, which will not be described here.

[0048] In the present embodiment, the penetrating boss 310 penetrates a threaded hole 311, and the hole wall of the threaded hole 311 is provided with an internal thread.

[0049] The threaded hole 311 penetrating the penetrating boss 310 is designed with an internal thread, so that the bolt can more stably connect the filling layer plate 300, thereby improving the fastening and reliability of the connection part and enhancing the installation convenience and stability of the composite sandwich panel.

[0050] Specifically, four bolts are provided; the bolts pass through the first through hole 101 penetrating the outer ply 100, the threaded hole 311 and the second through hole 401 penetrating the inner ply 400 in sequence, and the second through hole 401 is arranged at the bottom of the positioning groove 402.

[0051] Exemplarily, the material of the structural layer plate 200 is an aviation layer plate.

[0052] The aviation layer plate material of the structural layer plate 200 has excellent strength and stiffness, is light and durable, has the characteristics of light weight, high strength and corrosion resistance, etc., so that the composite sandwich panel has excellent impact resistance and compression resistance, and can be applied to the aviation field and other application scenarios with high requirements on material performance.

[0053] In the present embodiment, the material of the filling layer plate 300 is aluminum alloy.

[0054] The filling layer plate 300 made of aluminum alloy material not only ensures the structural strength, but also has the characteristics of light weight and corrosion resistance, and is easy to process and form, so that the whole is more light and durable, and is suitable for use in various environmental conditions.

[0055] The combination structure of the aviation layer plate and the layer plate made of aluminum alloy material is used as the core layer of the composite sandwich panel, and has high specific strength.

[0056] Exemplarily, the thickness of the internal layer 400 is equal everywhere.

[0057] The above limitation makes the composite sandwich panel bear force uniformly, and is not easy to deform or crack, improves the flatness and use effect, improves the quality and precision of the finished product, ensures the uniformity and consistency of the composite sandwich panel, and improves the aesthetic degree and practicality of the overall structure.

[0058] The composite sandwich panel is processed on a production mold, the production mold is provided with positioning holes, the number of the positioning holes is the same as that of the screw connection through holes 311 and they are concentrically corresponding one by one, and the positioning holes are used to position the core layer.

[0059] The production process of the core layer of the composite sandwich panel includes the following steps: the structural layer plate 200 and the filling layer plate 300 are adhesively connected and fixed by brushing the first structural adhesive layer on the contact surface; the external layer 100 is laid on the production mold layer by layer according to the layering rule; the core layer is placed; the internal layer 400 is laid on the core layer layer by layer according to the layering rule; the second through hole 401 concentric with the screw connection through hole 311 is pierced on the internal layer 400 by a tool such as a thimble, and the first through hole 101 concentric with the screw connection through hole 311 is pierced on the external layer 100; the core layer is fixed to the production mold through the screw thread cooperation of the screw connection through hole 311 and the screw thread of the bolt by penetrating the positioning hole reserved in the production mold through the screw; the composite sandwich panel is vacuumized and cured; the composite sandwich panel is demolded and taken out, and the residual glue in the screw connection through hole 311 is cleaned.

[0060] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation on the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or changes can be made on the basis of the above description. Here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A sandwich panel of composite material, characterised in that, The bolt and the external layer (100), the sandwich layer and the internal layer (400) are stacked from top to bottom, the sandwich layer includes a structural layer (200) and a filling layer (300) arranged on the lower side of the structural layer (200), the structural layer (200) is provided with a weight-reducing through hole, the filling layer (300) includes a plate body (320) and a plurality of penetrating bosses (310) arranged on the plate surface of the plate body (320), the structural layer (200) is provided with a penetrating through hole (201), the number of the penetrating through hole (201) is the same as that of the penetrating boss (310), and each penetrating boss (310) is matched and inserted into one penetrating through hole (201), the internal layer (400) is recessed with a positioning groove (402), the plate body (320) fills the positioning groove (402), the number of the bolt is the same as that of the penetrating boss (310), and each bolt penetrates the external layer (100), the penetrating boss (310) and the internal layer (400) from top to bottom.

2. The composite sandwich panel of claim 1, wherein, The external layer (100), the structural layer (200), the plate body (320) and the internal layer (400) are all circular plates, and the axis of the plate body (320) coincides with that of the structural layer (200).

3. The composite sandwich panel of claim 2, wherein, All the penetrating through holes (201) are uniformly distributed around the axis of the structural layer (200).

4. The composite sandwich panel of claim 2, wherein, The weight-reducing through hole includes a central through hole (203), and the axis of the central through hole (203) coincides with that of the structural layer (200).

5. The composite sandwich panel of claim 2, wherein, The weight-reducing through hole includes a plurality of arc-shaped through holes (202), and all the arc-shaped through holes (202) are uniformly distributed around the axis of the structural layer (200).

6. The composite sandwich panel of claim 1, wherein, A first structural adhesive layer is arranged between the plate body (320) and the structural layer (200), and is used for bonding and fixing the plate body (320) and the structural layer (200); and / or A second structural adhesive layer is arranged between the external layer (100) and the structural layer (200), and is used for bonding and fixing the external layer (100) and the structural layer (200); and / or A third structural adhesive layer is arranged between the internal layer (400) and the structural layer (200), and is used for bonding and fixing the internal layer (400) and the structural layer (200).

7. The composite sandwich panel of claim 1, wherein, The penetrating boss (310) is provided with a threaded through hole (311), and the hole wall of the threaded through hole (311) is provided with an internal thread.

8. The composite sandwich panel of claim 1, wherein, The material of the structural layer (200) is an aviation layer plate.

9. The composite sandwich panel of claim 1, wherein, The material of the filling layer (300) is an aluminum alloy.

10. The composite sandwich panel according to any one of claims 1-9, characterized in that, The thickness of the internal layer (400) is uniform.

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