Orthogonal structure core material and preparation device thereof

Abstract

The utility model provides an orthogonal structure core material and a preparation device thereof, and relates to the technical field of material compositing, in order to solve the problem that in the prior art, the sharp corner position of an R area cannot be effectively filled, and a cavity is formed, the orthogonal structure core material comprises a plurality of sets of blank layers, and the multiple sets of blank layers are equal in thickness and unequal in width. The multiple sets of blank layers are stacked from bottom to top, the widths of the multiple sets of blank layers are gradually reduced or gradually increased, and the center lines of the multiple sets of blank layers are located on the same vertical line. The matching degree of the shape of the core material with the orthogonal structure and the R area of the composite material component is high, and the problems that filling is insufficient due to the fact that the core material is wrapped with air in a traditional rolling and twisting mode, nondestructive faults occur in the position of the R area, and apparent faults caused by insufficient ironing are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to material composite technical field especially is related to a kind of orthogonal structure core material and its preparation device. BACKGROUND

[0002] With the continuous development of aviation manufacturing technology, carbon fiber, glass fiber and other fiber reinforced resin matrix composite materials are widely used for their high specific strength, specific modulus and good fatigue resistance and corrosion resistance, and have replaced metal in some key parts. However, during production and use, composite materials inevitably produce defects such as delamination, debonding and inclusion, which will seriously affect the mechanical properties and overall integrity of the composite material components. Non-destructive testing methods are an important means to ensure the reliable use of composite materials. In order to meet the requirements of structural design and reduce manufacturing cost, more and more integrally formed composite material components are widely used, and R transition zones are commonly present in these complex structures. The R transition zone is a curved surface with a narrow spatial size, which is very unfavorable for defect detection. At the same time, the R zone is a stress concentration area with small tolerance for defects, and defects are prone to occur during manufacturing. Therefore, quality control of the R zone is very important.

[0003] The existing composite structural parts usually use unidirectional tape prepreg to fill the R zone 101 position, as shown in Figure 1 and Figure 2 In actual production, the corresponding size of unidirectional tape prepreg 103 is cut, and the unidirectional tape prepreg 103 is rolled along the direction perpendicular to the unidirectional tape fiber to form a cylindrical unidirectional tape prepreg core material. During use, the cylindrical unidirectional tape prepreg core material is placed at the R zone 101 position of the composite material, and a hot iron is used to press the cylindrical core material, and the remaining material layer 102 is cured together.

[0004] The traditional core material has the following defects during preparation and use: a. The unidirectional tape prepreg 103 is prone to air wrapping during rolling, and the air is not easy to discharge, causing the prepared unidirectional tape prepreg core material to be insufficiently compacted, resulting in non-destructive failure of the cured composite material structural part at the R zone 101 position; b. When using a hot iron to press the core material, the R zone 101 sharp corner position cannot be effectively filled, causing a cavity at this position, resulting in non-destructive failure of the cured composite material at the R zone 101 sharp corner position; c. When using a hot iron to press the core material, the core material cannot be effectively compacted, resulting in a protrusion at the R zone 101, which causes the surface of the cured composite material component to have a protrusion, which does not meet the appearance requirements or assembly requirements; d. The fibers of the prepared core material are in the same direction, and the strength along the fiber direction is high, while the strength in the non-fiber direction is insufficient due to the resin connection, and the core material will crack under stress in the non-fiber direction after the composite part is cured and receives stress, resulting in non-destructive failure of the cured composite material at the R zone 101 position. Utility Model Content

[0005] The purpose of this invention is to provide an orthogonal structure core material and its preparation device to solve the problem in the prior art that the sharp corner position of the R area cannot be effectively filled, resulting in a cavity. The orthogonal structure core material of this invention has a high degree of matching with the R area of ​​the composite material component, avoiding the problem of insufficient filling caused by air entrapment in the core material due to traditional rolling and twisting methods, which would cause non-destructive failures in the R area position, and avoiding the appearance failures caused by insufficient ironing.

[0006] This utility model provides an orthogonal structure core material, comprising multiple sets of blank layers, the multiple sets of blank layers having equal thickness and unequal width, the multiple sets of blank layers being stacked from bottom to top with their width gradually decreasing or gradually increasing, and the centerlines of the multiple sets of blank layers being on the same vertical line.

[0007] As a preferred embodiment of the present invention, the blank layer includes multiple layers of unidirectional tape prepreg, and the multiple layers of unidirectional tape prepreg are laid up at different layup angles.

[0008] As a preferred embodiment of this utility model, the layup angle of the orthogonal core material is [45° / 0° / -45° / 90°].

[0009] As a preferred embodiment of the present invention, the blank layer comprises four layers of unidirectional prepreg.

[0010] As a preferred embodiment of this utility model, the minimum width of the blank layer is 2mm.

[0011] This utility model also provides an apparatus for preparing orthogonal structure core material, which includes a molding plate and a core material mold assembly. The core material mold assembly is provided with an extrusion groove adapted to the R region of the composite material component. The opening of the extrusion groove is upward. The molding plate covers the core material mold assembly and seals the upper opening of the extrusion groove.

[0012] As a preferred embodiment of the present invention, the core material mold assembly includes multiple core material mold units, which are connected side by side. On both sides of the top of each core material mold unit, rounded corners adapted to the R region of the composite material component are respectively provided. The rounded corners between two adjacent core material mold units are spliced ​​to form the extrusion groove.

[0013] As a preferred embodiment of the present invention, the core material mold assembly further includes a fixing bolt, and a transverse through hole is provided on the core material mold unit. The through holes on the multiple core material mold units are correspondingly provided, and the fixing bolt passes through the through holes on the multiple core material mold units to fix and connect the multiple core material mold units.

[0014] Compared with the prior art, the utility model have following positive effect:

[0015] The orthogonal structure core material provided by the utility model is provided with the laminated blank layers, the blank layer width is increased layer by layer according to the core material mold assembly R size, the laminated blank layers are stacked into the inverted pyramid-shaped orthogonal structure core material, the two sides of the laminated orthogonal structure core material form the stepped structure, the laminated orthogonal structure core material of the plurality of blank layers is similar to the size of the composite material component R area, and the matching degree with the composite material component R area is high, the air wrapping of the traditional rolling and winding mode is avoided to cause the filling shortage, the R area position is caused to appear the nondestructive fault, the apparent fault caused by the insufficient ironing and pressing is avoided, the internal nondestructive problem caused by the traditional core material preparation mode and the surface quality problem of the external surface are solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0017] Figure 1 It is the position schematic view of composite material structure piece R area;

[0018] Figure 2 It is the traditional core material preparation schematic view;

[0019] Figure 3 It is the structure schematic view of the preparation device of the orthogonal structure core material of the utility model;

[0020] Figure 4 It is the plane schematic view of the preparation device of the orthogonal structure core material of the utility model;

[0021] Figure 5 It is the orthogonal structure core material stacking schematic view in the utility model.

[0022] In the drawing: 101, R area;102, material layer;103, unidirectional tape prepreg;201, extrusion groove;202, core material mold unit;203, perforation;204, forming press plate;3, orthogonal structure core material;31, blank layer. DETAILED DESCRIPTION

[0023] In the description of the utility model, it needs to explain, unless otherwise stated, the meaning of "a plurality of" is two or more than two;The terms "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying, and is not indicative or suggestive of the device or element indicated must have a particular orientation, a particular orientation and operation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicative or suggestive of relative importance.

[0024] In the description of the utility model, it also needs to explain that, unless otherwise 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. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] The specific embodiments of the utility model will be further described in detail below in combination with the drawings.

[0026] Embodiment 1:

[0027] The orthogonal structure core material provided in this embodiment, as shown in Figure 5 , comprises a plurality of groups of blank layers 31, and the thickness of the plurality of groups of blank layers 31 is equal and the width is unequal. The plurality of groups of blank layers 31 are stacked from bottom to top and the width gradually decreases or gradually increases, and the center line of the plurality of blank layers 31 is on the same vertical line, so that the orthogonal structure core material 3 forms a left-right symmetrical pyramid-shaped structure.

[0028] In this embodiment, as shown in Figure 5 , the blank layer 31 comprises eight groups of blank layers 31, and the minimum width of the laid-up blank layer 31 is 2mm. After the blank layer 31 with a width of 2mm is stacked, the width of the blank layer 31 is increased layer by layer according to the size of the core material mold assembly R, and the stacked blank layer 31 is stacked into an inverted pyramid-shaped orthogonal structure core material.

[0029] The two sides of the orthogonal structure core material 3 stacked in this embodiment form a stepped structure, and the size of the orthogonal structure core material 3 stacked by the plurality of groups of blank layers 31 is similar to that of the composite material member R area, so as to be extruded into a shape by the extrusion groove 201.

[0030] As a preferred embodiment, as shown in Figure 5As shown, the blank layer 31 includes a plurality of layers of unidirectional tape prepreg 103, which are laid up at different ply angles. The unidirectional tape prepreg 103 is a layer of carbon fiber material, and the plurality of layers of unidirectional tape prepreg 103 are laid up at different ply angles to form the blank layer 31, which has excellent structural strength in all directions. According to the thickness of the material single layer, four layers of unidirectional tape prepreg are stacked, and the prepreg angle is [45° / 0° / -45° / 90°].

[0031] As a preferred embodiment, the ply angle of the orthogonal structure core material 3 is [45° / 0° / -45° / 90°]. Preferably, the four layers of unidirectional tape prepreg are a set of blank layers 31. The four layers of unidirectional tape prepreg are laid up at angles of 45° / 0° / -45° / 90°, respectively.

[0032] The angle of the orthogonal structure core material 3 in this embodiment is designed using the [45° / 0° / -45° / 90°] scheme, and the orthogonal angle design is used to ensure that the core material has good structural strength in all directions.

[0033] The embodiment also provides a preparation device for an orthogonal structure core material, as shown in Figures 3-5 The preparation device for the orthogonal structure core material includes a forming press plate 204 and a core material mold assembly, and the core material mold assembly is provided with an extrusion groove 201 matched with the composite material member R region. The extrusion groove 201 is provided with an upward opening, and the forming press plate 204 is provided on the core material mold assembly and seals the upper opening of the extrusion groove 201.

[0034] In use, the profile on the core material mold assembly is placed in the extrusion groove 201, and then the forming press plate 204 is covered to extrude and form the core material. The shape and size of the extrusion groove 201 are matched with the shape and size of the composite material member R region. After the core material is extruded and formed by the forming press plate 204 and the core material mold assembly, the shape and size of the core material are matched with the composite material member R region. After the core material is demolded from the core material mold assembly, the formed core material is placed at the position of the composite material member R region 101, and the assembly is completed.

[0035] The core material prepared in this embodiment has high matching degree with the composite material member R region, avoids the air wrapping of the core material caused by the traditional rolling and winding method, and causes insufficient filling, which causes no damage fault at the R region 101 position, avoids the surface fault caused by insufficient ironing and pressing, and solves the internal no damage problem and the external surface quality problem caused by the traditional core material preparation method.

[0036] As a preferred implementation, the core material mold assembly comprises a plurality of core material mold units 202, which are connected side by side. The top ends of the core material mold units 202 are provided with rounded corners adapted to the composite material member R region. The rounded corners between adjacent core material mold units 202 are spliced to form the extrusion groove 201. The bottom surface of the core material mold unit 202 is flat, facilitating horizontal arrangement. The core material mold unit 202 is made of pressure-resistant material and has high pressure-bearing strength. It can be made of steel.

[0037] In the embodiment, the plurality of core material mold units 202 are spliced to form a plurality of extrusion grooves 201. For example, four core material mold units 202 are spliced to form three extrusion grooves 201. This allows the core material mold assembly to simultaneously produce multiple core materials, improving production efficiency. The plurality of core material mold units 202 are detachably connected, making it easy to remove the core material after extrusion molding by separating the two core material mold units 202, ensuring that the shape of the core material remains consistent and is not affected by the removal process.

[0038] As a preferred implementation, the core material mold assembly further comprises a fixing bolt. The core material mold unit 202 is provided with a transverse hole 203, and the holes 203 on the plurality of core material mold units 202 are correspondingly arranged. The fixing bolt passes through the holes 203 on the plurality of core material mold units 202 to fixedly connect the plurality of core material mold units 202. The plurality of core material mold units 202 have the same shape and size. The shape and size of the core material mold unit 202 are designed according to the size of the composite material member R region.

[0039] In the embodiment, the plurality of core material mold units 202 are connected and fixed together by the fixing bolt passing through below them. The connection is tight and easy to disassemble.

[0040] The preparation method of the orthogonal structure core material 3 in the embodiment is: a, cutting the unidirectional tape prepreg 103 of the corresponding size; b, laying the unidirectional tape prepreg according to the [45° / 0° / -45° / 90°] layup angle, sealing a vacuum bag to pre-extract the layup after laying up, the pre-extraction vacuum degree is greater than or equal to-0.085 Mpa, and the pre-extraction time is greater than or equal to 15 min; c, cutting the blank with the width of L8 according to the size design drawing of the orthogonal structure core material 3, and cutting the blanks with the sizes of L7-L1 in turn; d, placing the blank with the width of L8 on a plane, stacking the blanks with the sizes of L7-L1 upwards in turn, keeping the middle alignment between the blanks with different sizes, and stacking into an inverted pyramid shape; e, placing the blank with the inverted pyramid shape into the extrusion groove 201 of the core material forming mold, and placing the forming pressing plate 204; f, sealing a vacuum bag; g, setting the hot pressing parameters (the hot pressing temperature is set near the Tg of the prepreg) in combination with the properties of the core material, and sending the forming pressing plate 204, the core material mold assembly and the orthogonal structure core material 3 into a hot pressing tank for hot pressing; h, demolding to obtain the orthogonal structure core material matching the outer shape of the R area 101 of the composite material component; i, after completing the layup of the material layers 102 of the remaining part of the composite material part, closing the mold, placing the orthogonal structure core material 3 matching the outer shape of the R area 101 of the composite material component at the position of the R area 101, and completing the assembly; j, sealing a vacuum bag, and curing the composite material part according to the predetermined curing parameters.

[0041] The preparation device of the orthogonal structure core material in the embodiment adds unidirectional tape prepregs with multiple fiber angles during the preparation of the core material, so that the prepared core material has excellent structural strength in each direction, ensures that the composite material component does not crack and other failures at this position after being stressed, avoids the air wrapping of the core material caused by the traditional rolling and winding method, and causes no damage at the R area 101 position, and extrudes the forming pressing plate 204 and the core material mold assembly through the tank feeding hot pressing mode, so that the core material is more matched with the R area 101.

[0042] The above only describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make some modifications and improvements without departing from the creative concept of the present application, which should be covered in the protection scope of the present application.

Claims

1. A core material of orthogonal structure, characterized by, The blank layers (31) comprise a plurality of groups of blank layers (31) with equal thickness and unequal width, the plurality of groups of blank layers (31) are stacked from bottom to top and gradually decrease or increase in width, and the midlines of the plurality of groups of blank layers (31) are on the same vertical line.

2. A core material of orthogonal structure according to claim 1, characterized in that The blank layers (31) comprise a plurality of unidirectional tape prepregs with different layup angles.

3. A core according to claim 2, wherein The layup angle of the orthogonal structure core material (3) is [45° / 0° / -45° / 90°].

4. A core according to claim 2, wherein The blank layers (31) comprise four unidirectional tape prepregs.

5. A core according to claim 2, wherein The width of the blank layer (31) with the smallest width is 2mm.

6. An apparatus for producing a core material of a cross structure, characterized by comprising: The orthogonal structure core material (3) of any one of claims 1-5 is prepared by a forming press plate (204) and a core material mold assembly, the core material mold assembly is provided with an extrusion groove (201) matched with the R region of the composite material component, the extrusion groove (201) is provided with an upward opening, and the forming press plate (204) is provided on the core material mold assembly and seals the upper opening of the extrusion groove (201).

7. The device for producing a core material of a cross structure according to claim 6, wherein The core material mold assembly comprises a plurality of core material mold units (202), the plurality of core material mold units (202) are connected side by side, and the top ends of the core material mold units (202) are respectively provided with rounded corners matched with the R region of the composite material component, and the rounded corners between the two adjacent core material mold units (202) are spliced to form the extrusion groove (201).

8. The device for producing a core material of a cross structure according to claim 7, wherein The core material mold assembly further comprises a fixing bolt, the core material mold units (202) are provided with transverse perforations (203), the perforations (203) on the plurality of core material mold units (202) are correspondingly arranged, and the fixing bolt passes through the perforations (203) on the plurality of core material mold units (202) to fixedly connect the plurality of core material mold units (202).

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