Carbon fiber composite shell and its preparation method, electronic equipment

Abstract

This invention discloses a carbon fiber composite shell, its preparation method, and an electronic device. The preparation method of the carbon fiber composite shell includes the following steps: providing an inner shell; placing the inner shell as an insert in a silicone molding mold for thermoforming with silicone to obtain an intermediate part; wherein the intermediate part includes an inner shell and a silicone core bonded to the inner surface of the inner shell; placing the intermediate part as an insert in a carbon fiber molding mold for thermoforming with carbon fiber composite material to obtain a semi-finished product; wherein the semi-finished product includes an inner shell, a silicone core bonded to the inner surface of the inner shell, and an outer shell bonded to the outer surface of the inner shell; removing the silicone core from the semi-finished product to obtain the carbon fiber composite shell. The technical solution of this invention can solve at least one of the related problems faced by current carbon fiber molding processes.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, and in particular to a carbon fiber composite shell, its preparation method, and electronic devices. Background Technology

[0002] Electronic devices, especially wearable devices, have high requirements for weight, strength and appearance. Using lightweight, high-strength and high-quality carbon fiber composite materials is a more advantageous choice.

[0003] Currently, the molding process for carbon fiber composite shells typically involves first forming the carbon fiber reinforced plastic shell through thermoforming, followed by CNC cutting to the desired shape. Then, the cut carbon fiber reinforced plastic shell is fixed to the inserts via bonding or injection molding to form the required overall structure. However, during this process, the carbon fiber reinforced plastic shell undergoes torsional deformation under internal stress after leaving the molding die, easily causing significant deviations in the positioning reference during CNC cutting, thus reducing cutting accuracy. Furthermore, bonding with the inserts involves complex dispensing processes, poor consistency in bond strength, and low yield. Additionally, the entire production process is complex and varied, with cumulative tolerances gradually increasing, easily leading to poor dimensional accuracy and inconsistent quality in the final product. Summary of the Invention

[0004] The main objective of this invention is to solve at least one of the aforementioned technical problems. Therefore, this invention provides a carbon fiber composite material shell and its preparation method, as well as an electronic device, aimed at solving at least one of the related problems faced by current carbon fiber molding processes.

[0005] To achieve the above objectives, the method for preparing a carbon fiber composite shell proposed in this invention includes the following steps:

[0006] Provide inner shell;

[0007] The inner shell is used as an insert and placed in a silicone molding mold for thermoforming with silicone to obtain an intermediate part; wherein, the intermediate part includes an inner shell and a silicone core bonded to the inner surface of the inner shell.

[0008] The intermediate component is used as an insert and placed in a carbon fiber molding die for thermoforming with the carbon fiber composite to obtain a semi-finished product. The semi-finished product includes an inner shell, a silicone core bonded to the inner surface of the inner shell, and an outer shell bonded to the outer surface of the inner shell.

[0009] The silicone core is removed from the semi-finished product to obtain a carbon fiber composite shell.

[0010] In one embodiment of the present invention, in the step of providing the inner shell, the inner shell is made of plastic and the glass transition temperature of the inner shell is not lower than 150°C.

[0011] In one embodiment of the present invention, before the step of placing the inner shell as an insert into a silicone molding die for thermoforming with silicone to obtain an intermediate part, the method further includes:

[0012] Apply a release agent to the inner surface of the inner shell; and / or apply a release agent to the silicone surface for bonding with the inner shell.

[0013] In one embodiment of the present invention, in the step of using the inner shell as an insert and placing it in a silicone molding mold for thermoforming with silicone to obtain an intermediate part, the silicone is solid silicone.

[0014] In one embodiment of the present invention, in the step of using the inner shell as an insert and placing it in a silicone molding mold to perform thermoforming treatment with silicone to obtain an intermediate part, the hardness of the silicone core after solid silicone molding is between Shore A40 and Shore A80.

[0015] In one embodiment of the present invention, before the step of placing the intermediate component as an insert into a carbon fiber molding die for thermoforming with the carbon fiber composite to obtain a semi-finished product, the method further includes:

[0016] Clean the outer surface of the inner shell with a cleaning agent and let it dry completely before use.

[0017] In one embodiment of the present invention, in the step of using an intermediate component as an insert and placing it in a carbon fiber molding mold to perform thermoforming treatment with the carbon fiber composite to obtain a semi-finished product, the resin in the carbon fiber composite is a thermosetting resin.

[0018] In one embodiment of the present invention, in the step of using the intermediate part as an insert and placing it in the carbon fiber molding mold for thermoforming with the carbon fiber composite to obtain a semi-finished product, when the intermediate part is used as an insert and placed in the carbon fiber molding mold, the positioning pin installed on the cavity wall passes through the silicone core and is inserted into the positioning hole of the inner shell.

[0019] To achieve the above objectives, the carbon fiber composite shell proposed in this invention is prepared by a method for preparing a carbon fiber composite shell, the method comprising the following steps:

[0020] Provide inner shell;

[0021] The inner shell is used as an insert and placed in a silicone molding mold for thermoforming with silicone to obtain an intermediate part; wherein, the intermediate part includes an inner shell and a silicone core bonded to the inner surface of the inner shell.

[0022] The intermediate component is used as an insert and placed in a carbon fiber molding die for thermoforming with the carbon fiber composite to obtain a semi-finished product. The semi-finished product includes an inner shell, a silicone core bonded to the inner surface of the inner shell, and an outer shell bonded to the outer surface of the inner shell.

[0023] The silicone core is removed from the semi-finished product to obtain a carbon fiber composite shell.

[0024] To achieve the above objectives, the electronic device proposed in this invention includes a carbon fiber composite material shell, which is prepared by a method for preparing a carbon fiber composite material shell, comprising the following steps:

[0025] Provide inner shell;

[0026] The inner shell is used as an insert and placed in a silicone molding mold for thermoforming with silicone to obtain an intermediate part; wherein, the intermediate part includes an inner shell and a silicone core bonded to the inner surface of the inner shell.

[0027] The intermediate component is used as an insert and placed in a carbon fiber molding die for thermoforming with the carbon fiber composite to obtain a semi-finished product. The semi-finished product includes an inner shell, a silicone core bonded to the inner surface of the inner shell, and an outer shell bonded to the outer surface of the inner shell.

[0028] The silicone core is removed from the semi-finished product to obtain a carbon fiber composite shell.

[0029] The method for preparing a carbon fiber composite shell proposed in this invention is a material composite process in which the molding process of the outer shell (i.e., the carbon fiber reinforced plastic shell) and the bonding process between the outer shell and the inner shell are carried out simultaneously. During molding, the resin in the carbon fiber composite is used as an adhesive, which automatically bonds and fixes it to the inner shell during the hot pressing process. After molding, the silicone core is removed, and the inner shell can be used for accurate positioning. The fiber reinforced plastic shell is then cut, avoiding the defect of gradually increasing cumulative tolerances, thus improving the dimensional accuracy and quality of the finished product. Furthermore, the entire production process is simplified, and production efficiency is improved. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a schematic flowchart of the first embodiment of the method for preparing the carbon fiber composite shell of the present invention;

[0032] Figure 2 This is a schematic flowchart of the second embodiment of the method for preparing the carbon fiber composite shell of the present invention;

[0033] Figure 3 This is a schematic flowchart of the third embodiment of the method for preparing the carbon fiber composite shell of the present invention.

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] In view of the technical problems mentioned in the background art, the present invention proposes a method for preparing a carbon fiber composite shell, which aims to solve at least one of the related problems faced by the current carbon fiber molding process.

[0038] The preparation method of the carbon fiber composite shell proposed in this invention will be described below in specific embodiments:

[0039] like Figure 1 The image shown is a first embodiment of the method for preparing the carbon fiber composite shell of the present invention. In this embodiment, the method for preparing the carbon fiber composite shell includes the following steps:

[0040] Step S100: Provide the inner shell;

[0041] Specifically, the inner shell can be made of either metal or plastic. When the inner shell is made of metal, it can be manufactured using processes such as stamping, CNC machining, and laser processing; while when the inner shell is made of plastic, it can be manufactured using processes such as injection molding. Understandably, the inner shell can be designed with complex mounting structures (for subsequent assembly with other parts) or fixing structures (for positioning during subsequent processing), such as holes, undercuts, and curved surfaces.

[0042] Step S200: The inner shell is used as an insert and placed in a silicone molding mold for thermoforming with silicone to obtain an intermediate part; wherein, the intermediate part includes an inner shell and a silicone core bonded to the inner surface of the inner shell.

[0043] Specifically, the inner shell is placed in a silicone molding mold and then placed on top of the silicone. The mold is then closed and thermo-pressed. During this process, the silicone gradually solidifies to form a silicone core, which encapsulates the complex structure inside the inner shell, forming a simple-looking integral component, i.e., the intermediate part.

[0044] Step S300: The intermediate part is used as an insert and placed in the carbon fiber molding mold to perform thermoforming treatment with the carbon fiber composite material to obtain a semi-finished product; wherein, the semi-finished product includes an inner shell, a silicone core bonded to the inner surface of the inner shell, and an outer shell bonded to the outer surface of the inner shell.

[0045] Specifically, the intermediate component is placed in a carbon fiber molding mold, and carbon fiber composite material is laid on it. Then the mold is closed and placed in a high-tonnage hot press. After setting the molding parameters, hot pressing is performed. During the process, the carbon fiber composite material gradually solidifies and is bonded to the inner shell by the resin within it to obtain the outer shell, which is the carbon fiber reinforced plastic shell.

[0046] It should be noted that, since the side of the silicone core facing away from the inner shell has a simple shape, during the hot pressing process of carbon fiber composite, the silicone core is supported on the cavity wall of the carbon fiber molding mold. It can also cooperate with the mold closing process to apply an outward force to the inner shell from the inside, thereby making the inner shell and the carbon fiber composite more tightly bonded. This results in an outer shell with a stronger bond to the inner shell, and the final carbon fiber composite shell has better overall performance.

[0047] Furthermore, the step of laying carbon fiber composite on the intermediate component can be carried out in a clean space with a temperature of 20°C to 26°C and a relative humidity of 60% to 80%. The shape of the carbon fiber composite can be obtained based on design requirements and two-dimensional drawings of the unfolded outer surface of the product, so as to obtain the required three-dimensional shell prototype after pre-molding on the intermediate component. There are several ways to obtain the two-dimensional drawings of the unfolded outer surface of the product, such as:

[0048] Scan the outer surface outline of the product, obtain a 2D layup unfolded diagram of approximately the area using 3D layup unfolding software, and then process it to obtain the layup die drawing for blanking; or, use masking tape to outline and unfold the outer surface of the product, scan it, and process it with software to obtain the layup die drawing for blanking.

[0049] In step S400, the silicone core on the semi-finished product is removed to obtain a carbon fiber composite shell.

[0050] Specifically, the silicone inner core has a certain degree of elasticity, making it easy to remove from the inner shell.

[0051] Understandably, the method for preparing the carbon fiber composite shell proposed in this embodiment is a material composite process in which the molding process of the outer shell (i.e., the carbon fiber reinforced plastic shell) and the bonding process between the outer shell and the inner shell are carried out simultaneously. During molding, the resin in the carbon fiber composite is used as an adhesive, which automatically bonds and fixes it to the inner shell during the hot-pressing process. After molding, the silicone core is removed, and the inner shell can be used for accurate positioning. Then, the fiber reinforced plastic shell is cut, avoiding the defect of gradually increasing cumulative tolerances, thus improving the dimensional accuracy and quality of the finished product. Furthermore, from the perspective of the entire production process, the workflow is simplified, and production efficiency is improved.

[0052] Furthermore, after the step of removing the silicone core from the semi-finished product to obtain the carbon fiber composite shell, the process may further include:

[0053] Using the inner shell of the carbon fiber composite shell as a positioning basis, the carbon fiber composite shell undergoes post-processing. Post-processing can include CNC machining, such as machining the required shape and holes on a CNC machine tool; it can also include laser processing, such as cutting the fiber composite shell to obtain the desired shape; drilling or grooving the fiber composite shell to obtain the desired surface structure; or surface treatment to obtain the desired surface condition.

[0054] In one embodiment of the method for preparing the carbon fiber composite shell of the present invention, in the step of providing the inner shell, i.e., in step S100, the inner shell is made of plastic material, and the glass transition temperature of the inner shell is not lower than 150°C.

[0055] For example, the inner shell is made of PEI or PI. This prevents deformation or melting during the subsequent silicone coating process, resulting in a tighter bond between the silicone core and the inner shell. This, in turn, facilitates the application of outward force by the silicone core during the hot pressing of the carbon fiber composite, further strengthening the bond between the inner and outer shells.

[0056] like Figure 2 The image shows a second embodiment of the method for preparing the carbon fiber composite shell of the present invention. The difference between this embodiment and the first embodiment is that, before step S200 in the first embodiment, i.e., before the step of "using the inner shell as an insert and placing it in a silicone molding die for thermoforming with silicone to obtain an intermediate part," the method further includes:

[0057] Step S500: Apply a release agent to the inner surface of the inner shell; and / or apply a release agent to the silicone surface for bonding with the inner shell.

[0058] It should be noted that because the inner surface of the inner shell has surface structures (such as holes, ribs, etc.), the contact area between the inner shell and the silicone core will increase, making it more difficult to remove the silicone core. In this case, applying a release agent to the inner surface of the inner shell, and / or to the silicone surface used for bonding with the inner shell, can help the silicone core remove more easily, thus avoiding damage to the surface structure of the inner shell.

[0059] Solvent-based release agents can be selected as the release agent.

[0060] It should be noted that water-based release agents have poor release effects, easily damaging the surface structure of the inner shell or making release difficult. Oil-based release agents, on the other hand, have a higher residue rate. Since release is performed from the inner surface of the inner shell, oil-based release agents are difficult to clean completely, and a high residue rate can easily lead to difficulties in assembling other structures or components inside the finished product. Therefore, solvent-based release agents are chosen because they provide satisfactory release effects while maintaining a low residue rate.

[0061] Understandably, the release agent can be applied only to the inner surface of the inner shell, only to the silicone surface used for bonding with the inner shell, or to both the inner surface of the inner shell and the silicone surface used for bonding with the inner shell.

[0062] In one embodiment of the method for preparing the carbon fiber composite shell of the present invention, in the step of using the inner shell as an insert and placing it in a silicone molding mold to perform thermoforming treatment with silicone to obtain an intermediate part, i.e., in step S200, the silicone is solid silicone.

[0063] It should be noted that silicone generally comes in two forms: liquid silicone and solid silicone. However, compared to solid silicone, liquid silicone remains relatively soft after curing and cannot provide adequate support for the inner shell. Consequently, it cannot achieve the goal of applying an appropriate amount of outward force during the hot pressing of carbon fiber composites to promote a tighter bond between the inner and outer shells.

[0064] In one embodiment of the method for preparing the carbon fiber composite shell of the present invention, in the step of using the inner shell as an insert and placing it in a silicone molding mold to perform thermoforming treatment with silicone to obtain an intermediate part, i.e., in step S200, the hardness of the silicone core after solid silicone molding is between Shore A40 and Shore A80.

[0065] It should be noted that the hardness of the silicone core after solid silicone molding should not be too high or too low: if it is too high, it will be too hard, which will not only cause difficulties in demolding, but also easily damage the inner shell. If it is too low, it will be too soft and elastic, and the support for the inner shell will be insufficient, thus failing to meet the purpose of applying an appropriate amount of outward force during the hot pressing of carbon fiber composites to promote a tighter bond between the inner and outer shells.

[0066] Therefore, in this embodiment, the hardness of the silicone core after solid silicone molding is set within the range of Shore A40 to Shore A80. Specifically, the hardness of the silicone core after solid silicone molding can be Shore A40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 55, 60, 65, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, or 80.

[0067] like Figure 3 The image shown is a third embodiment of the method for preparing the carbon fiber composite shell of the present invention. The difference between this embodiment and the first embodiment is that, before step S300 in the first embodiment, i.e., before the step of "using the intermediate part as an insert and placing it in a carbon fiber molding die for thermoforming with the carbon fiber composite to obtain a semi-finished product," the method further includes:

[0068] Step S600: Clean the outer surface of the inner shell with a cleaning agent and let it dry completely before use.

[0069] For example, ketone or alcohol solvents can be used as cleaning agents to clean the outer surface of the inner shell. This ensures the cleanliness of the outer surface of the inner shell, resulting in a stronger bond when the inner shell is bonded to the carbon fiber composite.

[0070] In one embodiment of the method for preparing the carbon fiber composite shell of the present invention, in the step of using the intermediate part as an insert and placing it in the carbon fiber molding mold to perform thermoforming treatment with the carbon fiber composite to obtain a semi-finished product, namely step S300, the resin in the carbon fiber composite is a thermosetting resin.

[0071] For example, the resin used in carbon fiber composites can be epoxy resin, vinyl resin, bismaleimide resin, or other thermosetting resins.

[0072] It should be noted that, compared to thermoplastic resins, thermosetting resins undergo chemical reactions and cross-linking between their internal molecules during hot pressing. This cross-linking effect also provides a strong adhesive effect when the carbon fiber composite is bonded to the inner shell, thereby improving the bonding strength between the carbon fiber composite and the inner shell and enhancing the strength of the final carbon fiber composite shell.

[0073] In addition, it should be noted that carbon fiber composites can be composed of a single layer of prepreg or two or more layers of prepreg; the prepreg can be either unidirectional or woven.

[0074] In one embodiment of the method for preparing the carbon fiber composite shell of the present invention, the carbon fiber composite is composed of several layers of prepreg. The layers of prepreg can be cured and formed by a single hot pressing to obtain an outer shell (i.e., a carbon fiber reinforced plastic shell) bonded to the outer surface of the inner shell. The process is simple, fast, and efficient, and the internal structure, composed of several layers of carbon fibers, has superior mechanical properties. For example, several unidirectional carbon fiber prepregs are stacked sequentially in an alternating pattern of 0° and 90°; or, multiple unidirectional carbon fiber prepregs are stacked sequentially in an alternating pattern of 0° and 90°, and then covered on both sides with two carbon fiber woven prepregs respectively. Of course, depending on the needs of the actual application scenario, those skilled in the art can also make other layering designs, which will not be elaborated here.

[0075] In one embodiment of the method for preparing the carbon fiber composite shell of the present invention, in the step of using the intermediate part as an insert and placing it in the carbon fiber molding mold to perform thermoforming treatment with the carbon fiber composite to obtain a semi-finished product, namely in step S300, when the intermediate part is used as an insert and placed in the carbon fiber molding mold, the positioning pin installed on the cavity wall passes through the silicone core and is inserted into the positioning hole of the inner shell.

[0076] In other words, before placing the intermediate component as an insert into the carbon fiber molding mold, it is necessary to pre-install positioning pins on the cavity wall of the mold and pre-leave positioning holes on the inner shell, as well as through holes in the silicone core at the corresponding positioning holes. When the intermediate component is placed into the mold, the positioning pins can pass through the through holes in the silicone core and insert into the positioning holes on the inner shell, thus fixing the inner shell to the mold. This prevents the inner shell from shifting even if the silicone core expands during the hot-pressing process of the carbon fiber composite, significantly improving the accuracy of the inner shell, the bonding precision between the outer and inner shells, and the quality of the final carbon fiber composite shell. Furthermore, the expansion of the silicone core during the process also covers the positioning pins, providing outward support to the inner shell along the pins, ensuring a tight bond between the inner and outer shells.

[0077] Understandably, the through holes on the silicone core can be formed either through additional positioning fixtures during the hot pressing process of silicone, or through the positioning structure of the silicone molding die itself. Alternatively, after obtaining the intermediate part, the through holes can be left on the silicone core through processing.

[0078] To address the technical problems mentioned in the background section, this invention also proposes a carbon fiber composite shell, which is prepared by the method described above. The specific implementation of this method is as described in the foregoing embodiments. Since this carbon fiber composite shell employs all the technical solutions of all the foregoing embodiments, it possesses at least all the beneficial effects brought about by all the technical solutions of all the foregoing embodiments, which will not be elaborated upon here.

[0079] To address the technical problems mentioned in the background section, the present invention also proposes an electronic device comprising a carbon fiber composite material shell as described above, the specific structure of which refers to the foregoing embodiments. Since this electronic device employs all the technical solutions of all the foregoing embodiments, it possesses at least all the beneficial effects brought about by all the technical solutions of all the foregoing embodiments, which will not be elaborated upon here.

[0080] Specifically, the electronic device can be AR glasses, the outer shell of which includes a lens frame and temples; that is, the lens frame can include the carbon fiber composite material outer shell as described above; the temples can include the carbon fiber composite material outer shell as described above; or both can include the carbon fiber composite material outer shell as described above.

[0081] The preparation method of the carbon fiber composite shell of the present invention will be described below through specific embodiments:

[0082] Example 1:

[0083] The carbon fiber composite shell is prepared according to the following steps:

[0084] Step 1: Injection molding the plastic inner shell; the plastic inner shell is made of PEI material and has detailed structures such as inverted and curved surfaces;

[0085] Step 2: The plastic inner shell formed in Step 1 is used as an insert, and a solvent-based mold release agent is applied to the inner surface of the plastic inner shell (the surface to be bonded with silicone). Silicone with a hardness of Shore A70 and the plastic inner shell are placed together in a silicone molding mold for thermoforming. The molding temperature is 150℃ and the molding pressure is 10MPa. The formed silicone will encapsulate the complex structure on the inner surface of the plastic inner shell, forming a simple overall component.

[0086] Step 3: Use ketone solvents as cleaning agents to clean the outer surface of the plastic inner shell in the overall assembly;

[0087] Step 4: Select T700 carbon fiber unidirectional prepreg (carbon fiber grade is T700, resin is E55 epoxy resin) and layer it alternately at 0° and 90° until the thickness is 0.6mm; use the overall component obtained in step 3 as an insert, place it in the carbon fiber thermoforming mold, and use the reserved through hole to position it with a stainless steel positioning pin. The diameter of the through hole is 5mm to prevent the insert from moving during the molding process; put the laminated carbon fiber composite into the mold, heat it at 140℃, and mold it under 10MPa pressure to obtain a semi-finished product; in the molded semi-finished product, the molded carbon fiber composite and the outer surface of the plastic inner shell are bonded together by the epoxy resin adhesive of the prepreg. The epoxy resin in the carbon fiber composite and the outer surface of the plastic inner shell are completely in contact, forming a strong bonding force to bond and fix the carbon fiber composite and the plastic inner shell together.

[0088] Step 5: Remove and tear off the silicone core from the inner surface of the plastic inner shell to expose the internal features of the plastic inner shell for recycling of the silicone core.

[0089] Step 6: Use the internal features of the plastic inner shell for positioning, and machine the required shape and external holes on a CNC machine tool;

[0090] Step 7: Apply paint to the exterior surface to obtain a carbon fiber composite shell.

[0091] Example 2:

[0092] The carbon fiber composite shell is prepared according to the following steps:

[0093] Step 1: Injection molding the plastic inner shell; the plastic inner shell is made of PI material and has detailed structures such as inverted and curved surfaces;

[0094] Step 2: The plastic inner shell formed in Step 1 is used as an insert, and a solvent-based mold release agent is applied to the inner surface of the plastic inner shell (the surface to be bonded with silicone). Silicone with a hardness of Shore A80 and the plastic inner shell are placed together in a silicone molding mold for thermoforming. The molding temperature is 160℃ and the molding pressure is 15MPa. The formed silicone will encapsulate the complex structure on the inner surface of the plastic inner shell, forming a simple overall component.

[0095] Step 3: Use ketone solvents as cleaning agents to clean the outer surface of the plastic inner shell in the overall assembly;

[0096] Step 4: Select carbon fiber woven prepreg (3K woven fabric with carbon fiber grade T300, and fast-curing epoxy resin) and layer it alternately at 45° and 90° until the thickness is 0.6mm; use the overall component obtained in step 3 as an insert, place it in the carbon fiber thermoforming mold, and put the laminated carbon fiber composite into the mold, heat it at 150℃, and form it under 12MPa pressure to obtain a semi-finished product; in the formed semi-finished product, the formed carbon fiber composite and the outer surface of the plastic inner shell are bonded together by the epoxy resin adhesive of the prepreg. The epoxy resin in the carbon fiber composite and the outer surface of the plastic inner shell are completely in contact, forming a strong bonding force to bond and fix the carbon fiber composite and the plastic inner shell together;

[0097] Step 5: Remove and tear off the silicone core from the inner surface of the plastic inner shell to expose the internal features of the plastic inner shell for recycling of the silicone core.

[0098] Step 6: Use the internal features of the plastic inner shell for positioning, and machine the required shape and external holes on a CNC machine tool;

[0099] Step 6: Apply paint to the exterior surface to obtain a carbon fiber composite shell.

[0100] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for preparing a carbon fiber composite shell, characterized in that, Includes the following steps: Provide inner shell; The inner shell is used as an insert and placed in a silicone molding mold for thermoforming with silicone to obtain an intermediate part. During the process, the silicone gradually solidifies to obtain a silicone core. The intermediate part includes an inner shell and a silicone core bonded to the inner surface of the inner shell. The silicone is solid silicone. The intermediate component is used as an insert and placed in a carbon fiber molding die for thermoforming with the carbon fiber composite to obtain a semi-finished product. The semi-finished product includes an inner shell, a silicone core bonded to the inner surface of the inner shell, and an outer shell bonded to the outer surface of the inner shell. The silicone core is removed from the semi-finished product to obtain a carbon fiber composite shell.

2. The preparation method according to claim 1, characterized in that, In the step of providing the inner shell, the inner shell is made of plastic and the glass transition temperature of the inner shell is not lower than 150°C.

3. The preparation method according to claim 1, characterized in that, Before the step of placing the inner shell as an insert into a silicone molding die for thermoforming with silicone to obtain the intermediate part, the method further includes: Apply a release agent to the inner surface of the inner shell; and / or apply a release agent to the silicone surface for bonding with the inner shell.

4. The preparation method according to claim 1, characterized in that, In the step of using the inner shell as an insert and placing it in a silicone molding mold for thermoforming with silicone to obtain an intermediate part, the hardness of the silicone core after solid silicone molding is between Shore A40 and Shore A80.

5. The preparation method according to claim 1, characterized in that, Before the step of placing the intermediate component as an insert into a carbon fiber molding die for thermoforming with the carbon fiber composite to obtain a semi-finished product, the method further includes: Clean the outer surface of the inner shell with a cleaning agent and let it dry completely before use.

6. The preparation method according to claim 1, characterized in that, In the step of using the intermediate component as an insert and placing it in a carbon fiber molding die for thermoforming with the carbon fiber composite to obtain a semi-finished product, the resin in the carbon fiber composite is a thermosetting resin.

7. The preparation method according to claim 1, characterized in that, In the step of using the intermediate part as an insert and placing it in the carbon fiber molding mold for thermoforming with the carbon fiber composite to obtain a semi-finished product, when the intermediate part is used as an insert and placed in the carbon fiber molding mold, the positioning pin installed on the cavity wall passes through the silicone core and is inserted into the positioning hole of the inner shell.

8. A carbon fiber composite material shell, characterized in that, It is prepared by the method for preparing the carbon fiber composite shell as described in any one of claims 1 to 7.

9. An electronic device, characterized in that, Includes the carbon fiber composite shell as described in claim 8.

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