A carbon fiber plate assembly and a mobile phone middle frame assembly

Abstract

The utility model relates to the technical field of machining discloses a kind of carbon fiber plate assembly and mobile phone middle frame assembly, carbon fiber plate assembly is made by the laminated mould pressing of several carbon fiber prepreg layers, wherein, the fiber extension direction of at least one carbon fiber prepreg layer is intersected with the fiber extension direction of at least another carbon fiber prepreg layer and in the several carbon fiber prepreg layers, the tensile elastic modulus of at least one carbon fiber prepreg layer is not same with the tensile elastic modulus of at least another carbon fiber prepreg layer.The mobile phone middle frame assembly is obtained by machining by above-mentioned carbon fiber plate assembly.The utility model can utilize carbon fiber material to produce and manufacture carbon fiber plate assembly, to replace metal material, and then while meeting design requirement, reduce product overall weight, improve product overall strength.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a carbon fiber plate assembly and a mobile phone mid-frame assembly. Background Technology

[0002] The mobile phone frame is the framework located between the front panel and the back cover of the phone. It supports various internal components such as the battery, motherboard, camera, flex cable, various sensors, microphone, earpiece, etc. It is the "skeleton" that allows these components to be fixed and installed.

[0003] Currently, most mobile phone manufacturers and models use aluminum alloy for their internal frame components. In the high-end market or specific scenarios, titanium alloy is also used as the material for mobile phone frames. However, whether it is aluminum alloy or titanium alloy, there are significant problems when using it as the material for mobile phone frame components.

[0004] While aluminum alloys possess a certain degree of corrosion resistance, their surfaces can still oxidize or corrode under certain conditions (such as humidity or salt spray). To enhance corrosion resistance, anodizing or coating treatments are typically required. However, these processes increase production costs, and wear or peeling may still occur after long-term use, affecting the phone's appearance and durability. Furthermore, while lightweight, aluminum alloys have relatively low strength. To meet the strength requirements of the phone's frame, increased material thickness or the use of high-strength aluminum alloys is usually necessary. This leads to an increase in phone weight, contradicting consumer demand for slim and lightweight phones. Additionally, aluminum alloys are prone to deformation or fracture under strong impacts, compromising the phone's structural integrity.

[0005] Titanium alloys possess unique advantages such as high strength, low density, excellent corrosion resistance, and biocompatibility. However, although their density is lower than stainless steel, their weight advantage over aluminum alloys is not significant. For example, the density of titanium alloys is approximately 4.5 g / cm³, while that of aluminum alloys is only 2.7 g / cm³. For mobile phone designs aiming for extreme lightweighting, titanium alloys do not offer significant weight reduction; instead, strength requirements may necessitate increased material thickness, leading to weight gain. Furthermore, the high hardness of titanium alloys makes them prone to tool wear during machining, increasing processing difficulty and cost. Simultaneously, the complex forming process of titanium alloys requires high-precision equipment (such as multi-axis CNC machine tools), further raising the production threshold and resulting in lower processing efficiency, longer production cycles, and difficulty in meeting the demands of large-scale mass production. Utility Model Content

[0006] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a carbon fiber plate assembly, which uses carbon fiber material to manufacture the mobile phone mid-frame assembly - top frame, thereby replacing the metal material, and thus reducing the overall weight of the mobile phone and improving the overall strength of the mobile phone while meeting the design requirements.

[0007] To solve the above-mentioned technical problems, the present invention provides a carbon fiber board assembly comprising multiple layers of carbon fiber prepreg plies, wherein the multiple layers of carbon fiber prepreg plies are integrally formed by molding, and the fiber extension directions of at least two layers intersect; the multiple layers of carbon fiber prepreg plies include at least a high-modulus ply and a high-strength ply, the fiber extension direction of at least one carbon fiber prepreg ply intersects perpendicularly with the fiber extension direction of at least another carbon fiber prepreg ply, and / or among the plurality of carbon fiber prepreg plies, the tensile modulus of elasticity of at least one carbon fiber prepreg ply is different from the tensile modulus of elasticity of at least another carbon fiber prepreg ply.

[0008] Furthermore, the carbon fiber composite layer comprises at least four different specifications of carbon fiber prepreg layups; the specifications include, for example, a first specification with a tensile modulus greater than or equal to 377 GPa and a FAW value of 15~25 g / m². 2 The first specification is a prepreg; the second specification is a tensile modulus greater than or equal to 377 GPa and a FAW value of 70~80 g / m³. 2 The third specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 15~25 g / m. 2 The fourth specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 45~55 g / m. 2 Prepreg.

[0009] Furthermore, the first specification is a tensile modulus greater than or equal to 377 GPa and a FAW value of 20 g / m³. 2 The prepreg; the second specification is a tensile modulus greater than or equal to 377 GPa and a FAW value of 75 g / m³. 2 The third specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 29 g / m. 2 The fourth specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 50 g / m. 2 Prepreg.

[0010] Furthermore, the thickness of the first specification is 0.02mm~0.03mm; the thickness of the second specification is 0.07~0.09mm; the thickness of the third specification is 0.015~0.025mm; and the thickness of the fourth specification is 0.045~0.055mm.

[0011] Furthermore, the thickness of the first specification is 0.025 mm; the thickness of the second specification is 0.08 mm; the thickness of the third specification is 0.02 mm; and the thickness of the fourth specification is 0.05 mm.

[0012] Furthermore, the multilayer carbon fiber prepreg ply includes at least three layers with the same fiber extension direction, and at least one isolation ply with a different fiber extension direction is provided between adjacent ply with the same direction.

[0013] Furthermore, the multilayer carbon fiber prepreg ply includes a first ply and an eighth ply, the ply angle of the first ply and the eighth ply is the first ply angle; a second ply, a third ply, a fourth ply, a fifth ply, a sixth ply and a seventh ply are provided between the first ply and the eighth ply, the second ply to the seventh ply are intermediate ply, the intermediate ply includes at least three ply with ply angles perpendicular to the first ply angle.

[0014] Furthermore, the first and eighth plies are both cut from carbon fiber prepreg of the first specification; the second and seventh plies are both cut from carbon fiber prepreg of the second specification; the third, fourth, and fifth plies are all cut from carbon fiber prepreg of the third specification; and the sixth ply is cut from carbon fiber prepreg of the fourth specification.

[0015] This utility model also provides a mobile phone mid-frame assembly, wherein the aforementioned carbon fiber plate assembly is obtained through machining.

[0016] The carbon fiber plate assembly of this utility model has at least the following beneficial effects: high strength, as a layup process is adopted in the manufacturing process, and 0-degree / 90-degree symmetrical fiber layup angles are designed according to different materials and thicknesses to balance the strength in the transverse and longitudinal directions of the product, and to balance the stress in hot pressing, ensuring minimal deformation after molding and meeting the flatness requirements; lightweight, as the carbon fiber plate assembly made of carbon fiber prepreg has a much lower weight than aluminum alloy and titanium alloy materials while ensuring a small thickness. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the first, third, and eighth plies according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the second and sixth plies according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the fourth layup according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the fifth ply of an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the seventh ply of an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the laying sequence according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of a carbon fiber plate assembly according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of a mobile phone mid-frame assembly according to an embodiment of the present invention.

[0026] The meanings of the labels in the attached diagram are as follows:

[0027] Mobile phone frame assembly - 10; First ply - 11; Second ply - 12; Third ply - 13; Fourth ply - 14; Fifth ply - 15; Sixth ply - 16; Seventh ply - 17; Eighth ply - 18; Carbon fiber plate assembly - 19; Positioning hole - 2; Ply jig - 3; Ply positioning pin - 31. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figures 1 to 8 As shown, this utility model provides a carbon fiber plate assembly, the material of which is carbon fiber prepreg.

[0030] like Figure 1 As shown, the carbon fiber plate assembly of this utility model includes multiple layers of carbon fiber prepreg, which are integrally formed by molding, and the fiber extension directions of at least two layers intersect.

[0031] Specifically, a suitable carbon fiber prepreg should be selected based on the actual design requirements of the phone's mid-frame. In this embodiment, taking the following design requirements as an example, if a carbon fiber phone mid-frame assembly needs to be designed, its strength must meet the following requirements: the overall part requires a tensile breaking strength > 3000N, and the overall part requires a flexural breaking strength > 60N. To meet this strength requirement, a mixture of carbon fiber prepregs with higher tensile strength (tensile strength ≥ 4900 MPa, tensile modulus 230 GPa) and carbon fiber prepregs with higher tensile modulus (tensile strength ≥ 4400 MPa, tensile modulus 377 GPa) can be used. This ensures that the tensile and flexural strength requirements are met while simultaneously optimizing costs. Furthermore, since carbon fiber has the strongest tensile strength in the fiber direction, the intersecting fiber layup angles are designed according to different materials and thicknesses to balance the transverse and longitudinal strength of the product and to balance stress during hot pressing, ensuring minimal deformation and meeting flatness requirements after molding.

[0032] In some embodiments, the multilayer carbon fiber prepreg layup includes at least a high modulus layup and a high strength layup, and the fiber extension direction of at least one carbon fiber prepreg layup intersects perpendicularly with the fiber extension direction of at least another carbon fiber prepreg layup.

[0033] Specifically, to maximize the strength balance of the carbon fiber plate assembly in both the transverse and longitudinal directions, the intersecting fiber layup angles can be designed to be 0 degrees / 90 degrees perpendicular. This satisfies the requirements of stress balance during hot pressing, minimizing deformation after molding, and ensuring satisfactory flatness, while further improving the strength balance of the carbon fiber plate assembly. It should be noted that the layup angles mentioned in this solution refer to the angle between the fiber extension direction of the carbon fiber layup and the length direction of the carbon fiber plate assembly.

[0034] In some embodiments, among the plurality of carbon fiber prepreg layers, the tensile modulus of at least one carbon fiber prepreg layer is different from the tensile modulus of at least another carbon fiber prepreg layer.

[0035] Specifically, the tensile modulus of elasticity of a carbon fiber prepreg layup is largely determined by the layup angle. Therefore, in this embodiment, among the several carbon fiber prepreg layups, the tensile modulus of elasticity of at least one carbon fiber prepreg layup is different from that of at least another carbon fiber prepreg layup. This allows the overall deformation of the carbon fiber plate assembly to be limited by a layup with a high tensile modulus, and the local strain of the carbon fiber plate assembly to be absorbed by a layup with a low tensile modulus.

[0036] In some embodiments, the carbon fiber plate assembly includes at least four different specifications of carbon fiber prepreg layups; the specifications include, for example, a first specification having a tensile modulus greater than or equal to 377 GPa and a FAW value of 15~25 g / m². 2 The first specification is a prepreg; the second specification is a tensile modulus greater than or equal to 377 GPa and a FAW value of 70~80 g / m³. 2 The third specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 15~25 g / m. 2 The fourth specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 45~55 g / m. 2 Prepreg.

[0037] Specifically, after determining the basic specifications of the carbon fiber prepreg according to the design requirements, further design can be carried out based on the thickness distribution of the mobile phone frame component 1. That is, a mixture of carbon fiber prepreg with high tensile strength (tensile strength greater than or equal to 4900 MPa) and carbon fiber prepreg with high tensile modulus (tensile modulus greater than or equal to 377 GPa) can be selected. In order to determine the final performance, processability and application of the carbon fiber sheet, an important parameter needs to be introduced, namely the FAW value (Fiber Areal Weight) of the carbon fiber prepreg. This FAW value directly determines the lightweight potential, mechanical properties and manufacturing cost of the carbon fiber sheet component. Therefore, in order to balance the lightweight, mechanical properties and manufacturing cost of the carbon fiber sheet component, the above specifications can be divided into four types in this embodiment: first specification, second specification, third specification and fourth specification. Among them, the first specification has a tensile modulus of elasticity greater than or equal to 377 GPa and a FAW value of 15~25 g / m. 2 The first specification is a prepreg with a tensile modulus greater than or equal to 377 GPa and a FAW value of 70~80 g / m2; the second specification is a prepreg with a tensile modulus greater than or equal to 4900 MPa and a FAW value of 15~25 g / m2. 2 The fourth specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 45~55 g / m. 2 Prepreg.

[0038] In some implementations, to further balance the lightweight, mechanical properties, and manufacturing cost of the carbon fiber plate assembly and to produce a carbon fiber plate assembly that meets design requirements, a first specification is adopted, which is a tensile modulus of elasticity greater than or equal to 377 GPa and a FAW value of 20 g / m. 2 The prepreg; the second specification is a tensile modulus greater than or equal to 377 GPa and a FAW value of 75 g / m³. 2 The third specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 29 g / m.2 The fourth specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 50 g / m. 2 Prepreg.

[0039] In some embodiments, the thickness of the first specification is 0.02mm to 0.03mm; the thickness of the second specification is 0.07mm to 0.09mm; the thickness of the third specification is 0.015mm to 0.025mm; and the thickness of the fourth specification is 0.045mm to 0.055mm.

[0040] In some embodiments, the thickness of the first specification is 0.025 mm; the thickness of the second specification is 0.08 mm; the thickness of the third specification is 0.02 mm; and the thickness of the fourth specification is 0.05 mm.

[0041] Furthermore, the basic specifications can be refined based on the thickness distribution of the mobile phone frame component 1, other parameters of the carbon fiber prepreg, and cost control during actual production. For example, they can be refined according to thickness (mm), density (g / m³), etc. 3 ), RC value (resin content, in percentage), FAW (fiber areal density, in g / m³) 2 The selected carbon fiber specifications were further classified based on parameters such as tow size and TG (glass transition temperature, in °C). The first specification was determined to be M40 (tensile modulus equal to 377 GPa) with a FAW value of 20 g / m³. 2 The thickness is 0.02mm~0.03mm (preferably 0.025mm to balance manufacturing cost, lightweighting, and mechanical properties), and the density is 1.6g / m³. 3 The first is a carbon fiber prepreg with a resin content of 40%; the second specification is a modulus grade of M40 (tensile modulus of elasticity equal to 377 GPa) and a FAW value of 75 g / m. 2 The thickness is 0.07~0.09mm (preferably 0.08mm), and the density is 1.55g / m³. 3 The first is a carbon fiber prepreg with a resin content of 38%; the second specification is a tensile strength of T700 (tensile strength equal to 4900MPa) and a FAW value of 20g / m. 2 The thickness is 0.015~0.025mm (preferably 0.02mm), and the density is 1.55g / m³. 3 The fourth specification is a carbon fiber prepreg with a resin content of 40%. It has a tensile strength of T700 (equivalent to 4900 MPa) and a FAW value of 50 g / m². 2 The thickness is 0.045~0.055mm (preferably 0.05mm), and the density is 1.6g / m³. 3The carbon fiber prepreg has a resin content of 40%. It should be noted that the selection of the above four specifications of carbon fiber prepreg is determined based on the product design requirements of this embodiment. However, in actual production, the selected prepreg specifications can naturally be adjusted according to actual design requirements and cost control.

[0042] In some embodiments, the multilayer carbon fiber prepreg layup includes at least three layers with the same fiber extension direction, and at least one isolation layer with a different fiber extension direction is provided between adjacent layers with the same fiber extension direction.

[0043] Specifically, according to the above-mentioned 0-degree / 90-degree symmetrical fiber layup angle design, in this embodiment, the carbon fiber plate assembly may include a first layup 11, a sixth layup 16, and an eighth layup 18 with a layup angle of the first layup angle. At least one layup with a layup angle perpendicular to the first layup angle is laid between the first layup 11 and the sixth layup 16, and between the sixth layup 16 and the eighth layup 18. The first layup angle can be any angle, thereby forming a carbon fiber composite layer that conforms to the above-mentioned 0-degree / 90-degree symmetrical fiber layup angle design, so that the transverse and longitudinal strength of the product is balanced, and the stress is balanced during hot pressing, ensuring the minimum deformation after molding and that the flatness meets the requirements. Since the carbon fiber layup angles are generally -45 degrees, 0 degrees, 45 degrees, and 90 degrees, in this embodiment, the first layup 11, the sixth layup 16, and the eighth layup 18 can be set to 90±3 degrees or 0±3 degrees. Then, at least one layup with a layup angle of 0±3 degrees or 90±3 degrees is laid between the corresponding first layup 11 and the sixth layup 16, and between the sixth layup 16 and the eighth layup 18. This forms a carbon fiber composite layer that conforms to the above-mentioned 0-degree / 90-degree symmetrical fiber layup angle design, so that the transverse and longitudinal strength of the product is balanced, and the stress is balanced during hot pressing, ensuring the lowest deformation after molding and that the flatness meets the requirements.

[0044] In some implementation methods, please refer to Figure 6 The multilayer carbon fiber prepreg ply includes a first ply 11 and an eighth ply 18, the ply angle of the first ply 11 and the eighth ply 18 is the first ply angle; a second to a seventh ply are provided between the first ply 11 and the eighth ply 18, the second to the seventh ply are intermediate ply, and the intermediate ply includes at least three ply angles perpendicular to the first ply angle.

[0045] Specifically, in this embodiment, please refer to Figure 7According to the above design requirements, the final carbon fiber plate assembly 19 can be formed by laying, molding, and CNC machining eight layers. In the actual manufacturing process, different numbers of layers can be selected according to different design requirements. The eight layers can be represented by the first layer 11 to the eighth layer 18. The first layer 11, the sixth layer 16, and the eighth layer 18 are layers with a layup angle of 90±3 degrees or 0±3 degrees, and the remaining layers are layers with a layup angle of 0±3 degrees or 90±3 degrees. All eight layers are laid in a preset laying order to form a carbon fiber composite layer that conforms to the above-mentioned 0-degree / 90-degree symmetrical fiber layup angle design. This balances the transverse and longitudinal strength of the product and the stress balances during hot pressing, ensuring minimal deformation after molding and meeting the flatness requirements.

[0046] In some embodiments, the first ply 11 and the eighth ply 18 are both cut from carbon fiber prepreg of the first specification; the second ply 12 and the seventh ply 17 are both cut from carbon fiber prepreg of the second specification; the third ply 13, the fourth ply 14 and the fifth ply 15 are all cut from carbon fiber prepreg of the third specification; and the sixth ply 16 is cut from carbon fiber prepreg of the fourth specification.

[0047] Specifically, in this embodiment, carbon fiber prepregs of corresponding specifications are cut according to a preset layup design to form different layups. Specifically, the first layup 11 and the eighth layup 18 correspond to the first specification of carbon fiber prepreg and are cut from it; the second layup 12 and the seventh layup 17 correspond to the second specification of carbon fiber prepreg and are cut from it; the third layup 13, the fourth layup 14, and the fifth layup 15 correspond to the third specification of carbon fiber prepreg and are cut from it; and the sixth layup 16 corresponds to the fourth specification of carbon fiber prepreg and is cut from it.

[0048] It is worth mentioning that, in this embodiment, the first ply 11 and the eighth ply 18 are the two outermost plies of the carbon fiber composite layer, and the shapes of all eight plies are cut according to the aforementioned preset ply design. Figures 1-5As shown, the first ply 11, the third ply 13, and the eighth ply 18 have the same shape, being a rectangle with several positioning holes 2; the second ply 12 is a rectangle with several positioning holes 2 and a convex through-slot, and its dimensions are the same as those of the first ply 11, the third ply 13, and the eighth ply 18; the fourth ply 14 is a long and narrow rectangle with the same length as the rectangles of the first ply 11, the third ply 13, and the eighth ply 18; the fifth ply 15 is a rectangle with a right-angled trapezoid cut at one apex, and its length and width are smaller than those of the first ply 11, the third ply 13, and the eighth ply 18; the sixth ply 16 has the same shape and dimensions as the second ply 12; the seventh ply 17 is a rectangle with at least one positioning hole 2 and a convex through-slot, and a rectangle cut from one side, and its dimensions are smaller than those of the first ply 11, the third ply 13, and the eighth ply 18. It should be noted that the shapes and dimensions of the first to eighth plies 18 described above are all based on the preset ply design. Therefore, in the actual manufacturing process, the shapes and dimensions of different plies can be adjusted according to the actual ply design. In addition, laying marks can be set on each ply according to the actual situation to facilitate positioning during laying.

[0049] In addition, the preset laying sequence in this embodiment is the sequence number of the eight lay-up layers mentioned above. According to this sequence number, different lay-up layers are laid manually onto the lay-up fixture 3 to obtain the carbon fiber composite layer. The lay-up fixture 3 is set according to the design requirements of the carbon fiber composite layer. Its surface is provided with lay-up positioning pins 31, which correspond to the positioning holes 2 on different lay-up layers. This ensures that the position of each lay-up layer is strictly aligned during the laying process, avoiding interlayer misalignment caused by manual placement deviation. This avoids material cutting errors or rework due to lay-up misalignment, reduces waste generation, and also allows workers to complete the lay-up by simply aligning the material with the lay-up positioning pins 31 without repeated measurement or adjustment, significantly shortening the single-layer laying time. It should be noted that in this embodiment, the fourth layer of the carbon fiber composite layer includes two fourth plies 14, while the seventh layer includes a seventh ply 17 and a ply cut from the second specification prepreg and having the same shape as the fourth ply 14. Furthermore, in the actual manufacturing process, the structure of the ply jig 3, the structure of the carbon fiber composite layer, and the shape and thickness of each ply can be adaptively adjusted according to the actual design requirements.

[0050] Please refer to Figure 8 The present invention also provides a mobile phone mid-frame assembly 10, which is obtained by CNC cutting a preset allowance from the aforementioned carbon fiber plate assembly 19.

[0051] The carbon fiber plate assembly 19 in this solution has been verified to be more than 40% lighter than aluminum alloy assemblies and more than 60% lighter than titanium alloy assemblies.

[0052] Based on the above embodiments, the carbon fiber plate assembly 19 of this utility model has strong corrosion resistance compared to aluminum alloy materials. At the same time, the carbon fiber plate assembly 19 adopts a lay-up process in the manufacturing process, and designs 0-degree / 90-degree symmetrical fiber lay-up angles according to different materials and thicknesses to balance the strength in the transverse and longitudinal directions of the product, and to balance the stress during hot pressing, ensuring minimal deformation after molding and meeting the flatness requirements. In addition, the carbon fiber plate assembly 19 made using carbon fiber prepreg is much lighter than aluminum alloy and titanium alloy materials.

[0053] The above description merely illustrates preferred embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A carbon fiber plate assembly, characterized in that, It includes a multilayer carbon fiber prepreg layup, wherein the multilayer carbon fiber prepreg layup is integrally formed by compression molding, and the fiber extension directions of at least two layups intersect. The multilayer carbon fiber prepreg layup includes at least a high modulus layup and a high strength layup, the fiber extension direction of at least one carbon fiber prepreg layup intersects perpendicularly with the fiber extension direction of at least another carbon fiber prepreg layup, and / or, among the plurality of carbon fiber prepreg layups, the tensile modulus of at least one carbon fiber prepreg layup is different from the tensile modulus of at least another carbon fiber prepreg layup.

2. The carbon fiber plate assembly as described in claim 1, characterized in that, It includes at least four different specifications of carbon fiber prepreg layups; the specifications include, for example, a first specification with a tensile modulus greater than or equal to 377 GPa and a FAW value of 15~25 g / m. 2 The first specification is a prepreg; the second specification is a tensile modulus greater than or equal to 377 GPa and a FAW value of 70~80 g / m³. 2 The third specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 15~25 g / m. 2 The fourth specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 45~55 g / m. 2 Prepreg.

3. The carbon fiber plate assembly as described in claim 2, characterized in that, The first specification is a tensile modulus of elasticity greater than or equal to 377 GPa and a FAW value of 20 g / m. 2 The prepreg; the second specification is a tensile modulus greater than or equal to 377 GPa and a FAW value of 75 g / m³. 2 The third specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 29 g / m. 2 The fourth specification is a prepreg with a tensile strength greater than or equal to 4900 MPa and a FAW value of 50 g / m. 2 Prepreg.

4. The carbon fiber plate assembly as described in claim 3, characterized in that, The thickness of the first specification is 0.02mm~0.03mm; the thickness of the second specification is 0.07~0.09mm; the thickness of the third specification is 0.015~0.025mm; and the thickness of the fourth specification is 0.045~0.055mm.

5. The carbon fiber plate assembly as described in claim 4, characterized in that, The thickness of the first specification is 0.025 mm; the thickness of the second specification is 0.08 mm; the thickness of the third specification is 0.02 mm; and the thickness of the fourth specification is 0.05 mm.

6. The carbon fiber plate assembly as described in claim 2, characterized in that, The multilayer carbon fiber prepreg ply includes at least three layers with the same fiber extension direction, and at least one isolation ply with a different fiber extension direction is provided between adjacent ply with the same direction.

7. The carbon fiber plate assembly as described in claim 6, characterized in that: The multilayer carbon fiber prepreg ply includes a first ply and an eighth ply, the ply angle of the first ply and the eighth ply is the first ply angle; between the first ply and the eighth ply, there are a second ply, a third ply, a fourth ply, a fifth ply, a sixth ply and a seventh ply, the second ply to the seventh ply are intermediate ply, the intermediate ply includes at least three ply angles perpendicular to the first ply angle.

8. The carbon fiber plate assembly as described in claim 7, characterized in that: The first and eighth plies are both cut from carbon fiber prepreg of the first specification; the second and seventh plies are both cut from carbon fiber prepreg of the second specification; the third, fourth and fifth plies are all cut from carbon fiber prepreg of the third specification; and the sixth ply is cut from carbon fiber prepreg of the fourth specification.

9. A mobile phone mid-frame component, characterized in that, The mobile phone frame assembly is obtained by machining the carbon fiber plate assembly as described in claim 8.

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