Metal-plastic composite shell, preparation method thereof and electronic equipment

Abstract

The invention provides a metal-plastic composite shell, a preparation method thereof and electronic equipment, and relates to the technical field of electronic product shells. The metal-plastic composite shell comprises: a metal inner shell, the inner side of which forms an accommodating space with a top opening; the hard rubber outer shell surrounds the metal inner shell, and a gap is formed between the hard rubber outer shell and the metal inner shell; and the curing adhesive layer is filled in the gap. The preparation method comprises the following steps: respectively preparing the metal inner shell and the hard rubber outer shell; embedding the metal inner shell into the hard rubber outer shell and forming a gap between the metal inner shell and the hard rubber outer shell; and liquid glue is poured into the gap and cured, and a cured glue layer filled in the gap is formed. According to the scheme, the problem that in a traditional structure that a hard rubber outer shell is directly injected on a metal inner shell, the hard rubber outer shell is prone to cracking can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of electronic product casing technology, and in particular to a metal-plastic composite casing and its preparation method, as well as electronic devices. Background Technology

[0002] High-power electronic devices, such as high-power fast chargers, generate a large amount of unevenly distributed heat during operation from their core power components. If this heat cannot be effectively and quickly dissipated, it will not only significantly reduce the reliability and lifespan of the components but also lead to uneven internal temperature distribution, severely limiting the device's performance. To meet heat dissipation requirements, these devices are increasingly choosing to use metal casings instead of traditional plastic casings. The high thermal conductivity of metal allows it to quickly absorb heat from inside the device and evenly diffuse and conduct it across the entire casing surface, thereby dissipating it to the external environment.

[0003] However, while the exposed metal casing is highly durable, it is also easily scratched and prone to irreversible dents from impacts or drops, affecting the product's appearance and safety. Therefore, some composite casings integrating metal and plastic have emerged on the market. These are created using insert molding, where a rigid plastic layer is coated onto the outer surface of the metal casing.

[0004] Direct injection molding of a rigid plastic shell onto a metal shell, especially when a large area of ​​metal is present, can lead to significant stress between the rigid plastic and metal layers due to the difference in shrinkage rates between the metal and plastic. This makes the rigid plastic layer highly susceptible to cracking, or even complete rupture, reducing product yield. Even if cracking does not occur during injection molding, the resulting composite shell is highly prone to cracking and damage during subsequent use under external forces (such as drops or impacts). Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a metal-plastic composite shell and its preparation method, as well as an electronic device, to solve the problem of how to avoid cracking of the outer hard plastic layer of the metal-plastic composite shell due to stress.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A first aspect of the present invention is to provide a metal-plastic composite housing, comprising: A metal-plastic composite housing, comprising: A metal inner shell, the inner side of which forms a receiving space with an open top; A rigid plastic outer shell surrounds a metal inner shell, the metal inner shell having a first surface facing the rigid plastic outer shell and a second surface facing the metal inner shell, with a gap between the first surface and the second surface; A cured adhesive layer, wherein the cured adhesive layer is filled in the gap by pouring in liquid adhesive and curing it.

[0007] In an alternative embodiment, the gap is formed between the first surface and the second surface based on the definition of the positioning element.

[0008] In an optional embodiment, the positioning element includes an internal positioning element integrally formed with the hard plastic shell, the internal positioning element protruding from the second surface and abutting against the first surface.

[0009] In an optional embodiment, the built-in positioning element is integrally formed and connected to the bottom wall of the hard plastic shell.

[0010] In an optional embodiment, the built-in positioning element is a cylindrical structure with a diameter of 0.5mm to 2.0mm.

[0011] In an optional embodiment, the vertical distance between the first surface and the second surface is 1.0 mm to 2.0 mm.

[0012] In an optional embodiment, the thickness of the inner metal shell is 0.3mm to 1.5mm; and / or, the thickness of the outer hard plastic shell is 0.5mm to 1.5mm.

[0013] In an optional embodiment, the material of the hard plastic shell is transparent plastic, and the liquid adhesive is a transparent liquid adhesive so that the cured adhesive layer is a transparent adhesive layer.

[0014] A second aspect of the present invention is to provide a method for preparing the metal-plastic composite shell as described above, the method comprising: The metal inner shell and the hard plastic outer shell are prepared separately. The inner metal shell is embedded in the outer rigid plastic shell such that the outer rigid plastic shell surrounds the inner metal shell, and there is a gap between the first surface of the inner metal shell facing the outer rigid plastic shell and the second surface of the outer rigid plastic shell facing the inner metal shell. Liquid adhesive is injected into the gap and cured to form the cured adhesive layer filling the gap, thereby preparing the metal-plastic composite shell.

[0015] In an alternative embodiment, the inner metal shell is embedded within the outer rigid plastic shell, and the gap is formed between the first surface and the second surface by the positioning element.

[0016] In an optional embodiment, the positioning element includes an internal positioning element integrally formed with the rigid plastic shell, the internal positioning element protruding from the second surface of the rigid plastic shell; when the metal inner shell is embedded in the rigid plastic shell, the internal positioning element abuts against the second surface of the metal inner shell, thereby defining the gap between the first surface and the second surface.

[0017] In an optional embodiment, the positioning element further includes an auxiliary positioning element, which is connected at the top of the inner metal shell between the inner metal shell and the hard plastic shell, and the auxiliary positioning element has a positioning portion that is inserted into the gap in a shape-fitting manner.

[0018] In an optional embodiment, the preparation method further includes: The metal-plastic composite shell is cut at one end that forms the top opening, so that the inner metal shell, the outer hard plastic shell, and the cured adhesive layer have flush end faces.

[0019] A third aspect of the present invention is to provide an electronic device comprising a metal-plastic composite housing as described above and electronic components disposed within the receiving space.

[0020] This invention provides a metal-plastic composite shell, its preparation method, and an electronic device. The metal-plastic composite shell includes a metal inner shell, a rigid plastic outer shell, and a curable adhesive layer. A gap exists between the rigid plastic outer shell and the metal inner shell. The curable adhesive layer is filled within this gap by injecting and curing liquid adhesive. By pre-setting a gap between the metal inner shell and the rigid plastic outer shell and injecting liquid adhesive, the liquid adhesive's liquid window period before curing is creatively utilized, making it a flowable, dynamic stress buffer medium. During the gradual curing of the liquid adhesive, the asynchronous expansion / contraction of the metal inner shell and the rigid plastic outer shell due to temperature changes (such as curing exothermics and ambient temperature differences) is compensated and absorbed by the real-time flow of the liquid adhesive, rather than accumulating as interfacial shear stress. This fundamentally avoids the problems of internal stress concentration and cracking of the rigid plastic shell caused by the mismatch of the coefficients of thermal expansion (CTE) of the two materials in traditional structures where a rigid plastic outer shell is directly injection molded onto a metal inner shell. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a metal-plastic composite shell according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a metal-plastic composite shell according to an embodiment of the present invention; Figure 3 For example Figure 2 An enlarged schematic diagram of part A in the diagram; Figure 4This is a structural illustration of a gap defined by an auxiliary positioning element in one embodiment of the present invention; Figure 5 For corresponding Figure 4 A cross-sectional view of the structure shown; Figure 6 This is a structural illustration of a gap defined by an auxiliary positioning element in another embodiment of the present invention; Figure 7 For corresponding Figure 6 A cross-sectional view of the structure shown; Figure 8 This is a cross-sectional view of another embodiment of the present invention, showing the use of a built-in positioning element to define the gap; Figure 9 This is a process diagram illustrating the preparation method of the composite shell in one embodiment of the present invention; Figure 10 This is a process diagram illustrating the preparation method of the composite shell according to another embodiment of the present invention; Figure 11 This is a process diagram illustrating the preparation method of the composite shell according to another embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention.

[0022] Explanation of icon numbers: 1. Metal inner shell; 11. Accommodation space; 12. First surface; 2. Hard plastic outer shell; 21. Internal positioning component; 22. Second surface; 3. Cured adhesive layer; 4. Gap; 5. Auxiliary positioning component; 100. Metal-plastic composite shell; 200. Electronic component; 201. Cover plate. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0024] It should also be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] See Figure 1 and Figure 2 An embodiment of the present invention provides a metal-plastic composite shell 100, which mainly includes a metal inner shell 1, a rigid plastic outer shell 2, and a cured adhesive layer 3. The metal inner shell 1, the cured adhesive layer 3, and the rigid plastic outer shell 2 are arranged sequentially from the inside to the outside. The inner side of the metal inner shell 1 forms a top-opening receiving space 11. The rigid plastic outer shell 2 surrounds the metal inner shell 1. The metal inner shell 1 has a first surface 12 facing the rigid plastic outer shell 2, and the rigid plastic outer shell 2 has a second surface 22 facing the metal inner shell 1. A gap 4 exists between the first surface 12 and the second surface 22. The cured adhesive layer 3 is filled within the gap 4 by injecting liquid adhesive and curing it.

[0026] The metal-plastic composite housing 100 described in the above embodiment is mainly used as a housing for electronic devices. By pre-setting a gap 4 between the metal inner housing 1 and the rigid plastic outer housing 2 and injecting liquid adhesive, the liquid adhesive creatively utilizes its liquid window period before curing, making it a flowable and dynamic stress buffer medium. During the process of the liquid adhesive gradually curing to form the cured adhesive layer 3, the asynchronous expansion / contraction of the metal inner housing 1 and the rigid plastic outer housing 2 caused by temperature changes (such as curing exothermics and ambient temperature differences) is compensated and absorbed by the real-time flow of the liquid adhesive, rather than accumulating into interfacial shear stress. This fundamentally avoids the problems of internal stress concentration and cracking of the rigid plastic outer housing caused by the mismatch of the coefficients of thermal expansion (CTE) of the two materials in the traditional structure of directly injection molding the rigid plastic outer housing 2 onto the metal inner housing 1.

[0027] In some specific embodiments, the gap 4 is formed between the first surface 12 and the second surface 22 based on the definition of the positioning element.

[0028] By setting the positioning element, the gap 4 is stably defined between the first surface 12 and the second surface 22. During the process of pouring liquid adhesive and curing to form the cured adhesive layer 3, the liquid adhesive, with its excellent self-leveling and wetting properties, can completely fill the gap 4 stably defined by the positioning element, forming a complete adhesive layer without bubbles or missing adhesive. This makes the cured adhesive layer 3 a continuous and thickness-controllable elastic interface layer, realizing 360° stress buffering and transmission between the metal inner shell 1 and the hard plastic outer shell 2 without dead angles. It completely eliminates the stress weak points existing in traditional point bonding or local buffering, and qualitatively improves the overall structural strength and reliability of the product.

[0029] In a preferred embodiment, a uniform gap is formed between the first surface 12 and the second surface 22 by means of the positioning element. The uniform gap means that the width of the gap 4 is the same at all locations. Specifically, the gap 4 is a continuous cavity formed between the first surface 12 and the second surface 22, and the width of the gap 4 can be understood as the vertical distance between the first surface 12 and the second surface 22, which is also the thickness of the cured adhesive layer 3 filling the gap 4. By defining the gap 4 with the positioning element, the gap 4 becomes a uniform gap, and correspondingly, the cured adhesive layer 3 filling the gap 4 also has a uniform thickness, thereby ensuring that the cured adhesive layer 3 has balanced stress-absorbing performance at all locations of the metal-plastic composite shell 100.

[0030] In some specific embodiments, the positioning element includes an internal positioning element 21 integrally formed with the rigid plastic shell 2. The internal positioning element 21 protrudes from the second surface 22 of the rigid plastic shell 2 and abuts against the first surface 12 of the metal inner shell 1. After the liquid adhesive is poured in and cured to form the cured adhesive layer 3, the internal positioning element 21 remains within the metal-plastic composite shell 100. By providing an internal positioning element 21 integrally formed with the rigid plastic shell 2 to limit the gap 4, the internal positioning element 21, as part of the rigid shell, can achieve extremely high dimensional and positional accuracy during injection molding, which is beneficial for limiting the gap 4 to a uniform gap.

[0031] In some specific embodiments, see Figures 4 to 7The built-in positioning member 21 is integrally formed and connected only on the bottom wall of the rigid plastic outer shell 2. The positioning member also includes an auxiliary positioning member 5, which connects the top of the metal inner shell 1 between the metal inner shell 1 and the rigid plastic outer shell 2. The auxiliary positioning member 5 has a positioning portion 51 that is inserted into the gap 4 in a shape-fitting manner. The built-in positioning member 21 positions the metal inner shell 1 from the bottom, and the auxiliary positioning member 5 positions the metal inner shell 1 from the side. Based on the positioning of the metal inner shell 1 by the built-in positioning member 21 and the auxiliary positioning member 5, a uniform gap 4 is defined between the second surface 22 of the rigid plastic outer shell 2 and the first surface 12 of the metal inner shell 1. The auxiliary positioning member 5 is removed after the liquid adhesive is poured in and cured to form the cured adhesive layer 3.

[0032] In an optional embodiment, combined with Figure 4 and Figure 5 As shown, the auxiliary positioning component 5 is an independent structural component. After the metal inner shell 1 is embedded into the hard plastic outer shell 2, the auxiliary positioning component 5 is then assembled so that the positioning part 51 is inserted into the gap 4, positioning the metal inner shell 1 from the side. As a specific example, for instance... Figure 4 In this process, an auxiliary positioning element 5 is provided on each of the four sides corresponding to the metal inner shell 1. After the liquid adhesive is poured in and cured to form the cured adhesive layer 3, the auxiliary positioning element 5 is removed.

[0033] In an optional embodiment, combined with Figure 6 and Figure 7 As shown, the auxiliary positioning component 5 is integrally connected to the metal inner shell 1. After the metal inner shell 1 is embedded into the hard plastic outer shell 2, the positioning part 51 of the auxiliary positioning component 5 is inserted into the gap 4 to position the metal inner shell 1 from the side. As a specific example, such as... Figure 6 In the process, an auxiliary positioning component 5 is integrally connected to each of two adjacent corners of the metal inner shell 1, and an auxiliary positioning component 5 is integrally connected to each of two adjacent sides of the metal inner shell 1. After the liquid adhesive is poured in and cured to form the cured adhesive layer 3, the auxiliary positioning component 5 is cut off and removed.

[0034] In some specific embodiments, see Figure 8The built-in positioning member 21 is provided on the second surface 12 of the rigid outer shell 2, including the portion located on the bottom wall and the portion located on the surrounding side walls. The built-in positioning member 21 located on the bottom wall positions the metal inner shell 1 from the bottom, and the built-in positioning member 21 located on the surrounding side walls positions the metal inner shell 1 from the side. Based on the positioning of the metal inner shell 1 by the two parts of the built-in positioning member 21, a gap 4 is defined between the second surface 22 of the rigid outer shell 2 and the first surface of the metal inner shell 1.

[0035] Since the built-in positioning element 21 is located within the gap 4, the liquid adhesive may be injected, which may adversely affect the flowability of the liquid adhesive and reduce the quality of the cured adhesive layer 3. Therefore, it is preferable to set the built-in positioning element 21 only on the bottom wall of the hard plastic shell 2, combined with the limiting method of the auxiliary positioning element 5, and to minimize the number of the built-in positioning elements 21 as much as possible.

[0036] On the other hand, when both the hard plastic outer shell 2 and the cured adhesive layer 3 are made of transparent materials, so that the metal-plastic composite shell 100 can visually present the shape, structure, and color of the first surface 12 of the inner metal shell 1, the built-in positioning member 21, being retained within the metal-plastic composite shell 100, may have its outline clearly visible from the outside of the shell, thus reducing the overall aesthetic appeal of the shell. Therefore, considering this aspect, it is preferable to only provide the built-in positioning member 21 on the bottom wall of the hard plastic outer shell 2, combined with the limiting method of the auxiliary positioning member 5, and to minimize the number of the built-in positioning members 21 as much as possible.

[0037] For example, as a specific case, such as Figure 2 , Figure 5 and Figure 7 As shown, the bottom wall of the hard plastic shell 2 is provided with only one built-in positioning member 21, which is located at the center of the bottom wall of the hard plastic shell 2.

[0038] In a preferred embodiment, the built-in positioning member 21 is a cylindrical structure, and its diameter R is set within the range of 0.5mm to 2.0mm. On one hand, this structural shape and size of the built-in positioning member 21 can reduce the adverse effects on the flowability of the liquid adhesive; on the other hand, when both the rigid adhesive shell 2 and the cured adhesive layer 3 are transparent, this structural shape and size of the built-in positioning member 21 helps to prevent its obvious outline from being observed from the outside of the shell.

[0039] In some alternative embodiments, see Figure 2 and Figure 3The vertical distance between the first surface 12 and the second surface 22, i.e., the width of the gap 4, which is also the thickness D3 of the cured adhesive layer 3, is preferably set to 1.0mm~2.0mm. The thickness D1 of the metal inner shell 1 is preferably set to 0.3mm~1.5mm. The thickness D2 of the hard plastic outer shell 2 is preferably set to 0.5mm~1.5mm.

[0040] In some alternatives, the inner metal shell 1 can be made of aluminum alloy, magnesium alloy or stainless steel, with lighter aluminum alloy or magnesium alloy being preferred, thereby reducing the overall weight of the shell.

[0041] In some alternative solutions, both the rigid outer shell 2 and the cured adhesive layer 3 are made of transparent materials, such as materials with a light transmittance of over 90%. Thus, the metal-plastic composite shell 100 can visually represent the shape, structure, and color of the first surface 12 of the inner metal shell 1, maintaining the aesthetic appeal of the metal surface's luster. Furthermore, the first surface 12 of the inner metal shell 1 can be further subjected to surface treatment processes such as anodizing, spraying, and electroplating to enhance its texture, making the metal-plastic composite shell 100 more aesthetically pleasing and improving product competitiveness.

[0042] In some alternative solutions, the material of the hard plastic shell 2 is a transparent plastic, which may be selected from one or more of transparent PMMA, ABS and PC.

[0043] In some alternative solutions, the material of the cured adhesive layer 3, the liquid adhesive is a transparent liquid adhesive so that the cured adhesive layer 3 is a transparent adhesive layer, the liquid adhesive is, for example, a transparent glue or a transparent silicone, the transparent glue is, for example, a transparent AB glue, a UV glue or a naturally curing glue, etc.

[0044] Based on the metal-plastic composite shell 100 provided in the above embodiments, this embodiment of the invention also provides a method for preparing the metal-plastic composite shell 100. See reference. Figures 9 to 11 and combined Figures 1 to 8 As shown, the preparation method includes the following steps: Step S1: Prepare the metal inner shell 1 and the hard plastic outer shell 2 respectively.

[0045] In a specific embodiment, the metal inner shell 1 can be prepared by stamping a metal sheet of the corresponding material or by machining a metal block of the corresponding material.

[0046] Furthermore, the outer surface of the metal inner shell 1 can be further subjected to surface treatment processes such as surface anodizing, sandblasting, spraying, and electroplating to enhance its texture.

[0047] In a specific embodiment, the hard plastic shell 2 can be prepared using an injection molding process.

[0048] Step S2: Embed the metal inner shell 1 into the hard plastic outer shell 2, such that the hard plastic outer shell 2 surrounds the metal inner shell 1, and there is a gap 4 between the first surface 12 of the metal inner shell 1 facing the hard plastic outer shell 2 and the second surface 22 of the hard plastic outer shell 2 facing the metal inner shell 1.

[0049] Step S3: Pour liquid adhesive into the gap 4 and cure it to form the cured adhesive layer 3 filling the gap 4, thereby preparing the metal-plastic composite shell 100.

[0050] In some specific embodiments, in step S2, the metal inner shell 1 is embedded in the hard plastic outer shell 2, and the gap 4 is formed between the first surface 12 and the second surface 22 by the positioning member.

[0051] In a preferred embodiment, the positioning element forms a uniform gap 4 between the first surface 12 and the second surface 22, thereby making the cured adhesive layer 3 filling the gap 4 have a uniform thickness.

[0052] In some specific embodiments, the positioning element includes an internal positioning element 21 integrally formed with the rigid plastic shell 2, the internal positioning element 21 protruding from the second surface 22 of the rigid plastic shell 2. When the metal inner shell 1 is embedded into the rigid plastic shell 2, the internal positioning element 21 abuts against the first surface 12 of the metal inner shell 1, thereby defining the gap 4 between the rigid plastic shell 2 and the metal inner shell 1.

[0053] In some specific embodiments, the positioning member further includes an auxiliary positioning member 5, which is connected at the top of the metal inner shell 1 between the metal inner shell 1 and the hard plastic outer shell 2, and the auxiliary positioning member 5 has a positioning part 51 that is inserted into the gap in a shape-adaptive manner.

[0054] In some specific embodiments, the preparation method further includes: cutting the metal-plastic composite housing 100 at the end forming the top opening, so that the inner metal shell 1, the hard plastic shell 2, and the cured adhesive layer 3 have flush end faces. Having flush end faces facilitates the assembly of the metal-plastic composite housing 100 with other components of the electronic device when subsequently applied to it.

[0055] In one optional specific embodiment, such as Figure 9As shown, the preparation method includes the following steps: Step S101, as follows Figure 9 As shown in (a), the metal inner shell 1 and the hard plastic outer shell 2 are respectively prepared. In this embodiment, a plurality of integrally formed and connected built-in positioning members 21 are provided on the second surface 22 of the hard plastic outer shell 2 (including the surface located on the bottom wall portion and the surface located on the surrounding side wall portions).

[0056] Step S102, as follows Figure 9 As shown in (b), the metal inner shell 1 is embedded in the hard plastic outer shell 2, and the metal inner shell 1 is positioned by the built-in positioning member 21 located on the bottom wall of the hard plastic outer shell 2 and on the surrounding side walls of the hard plastic outer shell 2, thereby defining a gap 4 between the second surface 22 of the hard plastic outer shell 2 and the first surface 12 of the metal inner shell 1.

[0057] Step S103, as follows Figure 9 As shown in (c), liquid adhesive is injected into the gap 4 and cured to form the cured adhesive layer 3 filling the gap 4.

[0058] Step S104, as follows Figure 9 -(c) and Figure 9 As shown in (d), a cutting process is performed at the end forming the top opening (the dotted line B1-B1 in the figure represents the cutting line), so that the metal inner shell 1, the hard plastic outer shell 2, and the cured adhesive layer 3 have flush end faces, ultimately producing the desired result. Figure 9 - (d) shows the metal-plastic composite shell.

[0059] In another alternative specific embodiment, such as Figure 10 As shown, the preparation method includes the following steps: Step S201, as follows Figure 10 As shown in (a), the metal inner shell 1 and the rigid plastic outer shell 2 are prepared respectively. In this embodiment, an integrally formed internal positioning member 21 is provided only on the bottom wall portion of the second surface 22 of the rigid plastic outer shell 2.

[0060] Step S202, as follows Figure 10 As shown in (b), the inner metal shell 1 is embedded within the outer rigid plastic shell 2. The inner metal shell 1 is positioned by a built-in positioning member 21 located on the bottom wall of the outer rigid plastic shell 2 in conjunction with an auxiliary positioning member 5, thereby defining a gap 4 between the second surface 22 of the outer rigid plastic shell 2 and the first surface 12 of the inner metal shell 1. In this embodiment, the auxiliary positioning member 5 is an independent structural component.

[0061] Step S203, as follows Figure 10As shown in (c), liquid adhesive is injected into the gap 4 and cured to form the cured adhesive layer 3 filling the gap 4.

[0062] Step S204, as Figure 10 -(c) and Figure 10 As shown in (d), a cutting process is performed at the end forming the top opening (the dotted line B2-B2 in the figure represents the cutting line), so that the metal inner shell 1, the hard plastic outer shell 2, and the cured adhesive layer 3 have flush end faces, ultimately producing the desired result. Figure 10 - (d) shows the metal-plastic composite shell.

[0063] The auxiliary positioning component 5 can be removed after the cured adhesive layer 3 is formed in step S203, or it can be removed during cutting in step S204.

[0064] In another alternative specific embodiment, such as Figure 11 As shown, the preparation method includes the following steps: Step S301, as follows Figure 11 As shown in (a), the metal inner shell 1 and the hard plastic outer shell 2 are prepared respectively. In this embodiment, an integrally formed internal positioning member 21 is provided only on the bottom wall portion of the second surface 22 of the hard plastic outer shell 2, and an auxiliary positioning member 5 is integrally connected to the top of the metal inner shell 1.

[0065] Step S302, as follows Figure 11 As shown in (b), the metal inner shell 1 is embedded in the hard plastic outer shell 2. The metal inner shell 1 is positioned by the built-in positioning member 21 located on the bottom wall of the hard plastic outer shell 2 and the auxiliary positioning member 5 connected to the top of the metal inner shell 1, thereby defining a gap 4 between the second surface 22 of the hard plastic outer shell 2 and the first surface 12 of the metal inner shell 1.

[0066] Step S303, as follows Figure 11 As shown in (c), liquid adhesive is injected into the gap 4 and cured to form the cured adhesive layer 3 filling the gap 4.

[0067] Step S304, as Figure 11 -(c) and Figure 11 As shown in (d), a cutting process is performed at the end forming the top opening (the dotted line B3-B3 in the figure represents the cutting line), so that the metal inner shell 1, the hard plastic outer shell 2, and the cured adhesive layer 3 have flush end faces, ultimately producing the desired result. Figure 11 - (d) shows the metal-plastic composite shell.

[0068] The auxiliary positioning component 5 is removed during the cutting process in step S304.

[0069] The metal-plastic composite shell preparation method provided in the above embodiment, based on the process concept of "first preparing a hard shell (including a metal inner shell 1 and a hard plastic outer shell 2), and then filling it with adhesive to form a soft shell (cured adhesive layer 3)," has significant manufacturing advantages: 1. Avoiding thermal shock: The hard plastic shell can be injection molded independently and fully cooled and shaped, avoiding the thermal shock and deformation caused by the high temperature melt to the metal inner shell when directly injection molding the metal, thus ensuring the dimensional accuracy and mechanical properties of the metal parts.

[0070] 2. Reduced process difficulty: Compared with the complex one-piece molding process of "metal-soft rubber-hard plastic", the preparation process of this application is decomposed into two mature processes (injection molding + potting), which greatly reduces the complexity of mold design and the difficulty of molding process control, and improves production yield.

[0071] 3. Additional functions integrated to achieve multiple functions with one adhesive: The cured adhesive layer not only acts as a stress buffer, but also integrates additional functions for the product according to the characteristics of the selected material (liquid adhesive), such as excellent sealing and waterproofing: The continuous adhesive layer naturally forms a reliable sealing barrier, which can easily achieve IP67 or even higher levels of waterproofing and dustproofing when applied to electronic devices.

[0072] Based on the metal-plastic composite housing 100 provided in the above embodiments, this invention also provides an electronic device, see below. Figure 12 The electronic device mainly includes a metal-plastic composite housing 100 and an electronic component 200 provided in any of the foregoing embodiments of the present invention. The electronic component 200 is assembled within the receiving space 11 of the metal-plastic composite housing 100. Specifically, a plastic inner layer support (not shown in the drawings) may be provided within the receiving space 11, and the electronic component 200 is connected to the plastic inner layer support. The electronic component 200 includes a cover plate 201 that covers the top opening of the receiving space 11.

[0073] As described in the above embodiments, when the internal electronic components 200 generate heat, the heat is first released outwards through the inner plastic support layer, and then dissipated to the outside through the metal-plastic composite shell 100. The metal inner shell 1 within the metal-plastic composite shell 100 has excellent thermal conductivity, allowing heat to dissipate quickly and evenly laterally, and then dissipate outwards through the entire shell surface, resulting in a decrease in the overall product temperature and preventing localized overheating or melting. By employing the metal-plastic composite shell 100 provided in this embodiment, rapid heat dissipation is achieved while ensuring a more uniform surface temperature, thus improving the user experience.

[0074] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A metal-plastic composite housing, characterized by, The metal inner shell forms a top-open containing space on its inner side. The hard-rubber outer shell surrounds the metal inner shell, has a first surface facing the metal inner shell, and has a second surface facing the metal inner shell, with a gap between the first surface and the second surface. The cured glue layer is filled in the gap by pouring liquid glue and curing. The gap is formed between the first surface and the second surface based on the definition of the positioning member.

2. The metal-plastic composite case according to claim 1, wherein The positioning member includes an in-built positioning member integrally formed with the hard-rubber outer shell, which protrudes from the second surface and abuts against the first surface.

3. The metal-plastic composite case according to claim 2, characterized by The in-built positioning member is integrally formed on the bottom wall of the hard-rubber outer shell.

4. The metal-plastic composite case according to claim 3, wherein The in-built positioning member has a cylindrical structure with a diameter of 0.5-2.0 mm.

5. The metal-plastic composite case according to claim 3, wherein The vertical distance between the first surface and the second surface is 1.0-2.0 mm.

6. The metal-plastic composite case according to claim 2, wherein The thickness of the metal inner shell is 0.3-1.5 mm; and / or, the thickness of the hard-rubber outer shell is 0.5-1.5 mm.

7. The metal-plastic composite case according to claim 1, wherein The material of the hard-rubber outer shell is transparent plastic, and the liquid glue is transparent liquid glue, so that the cured glue layer is a transparent glue layer.

8. The metal-plastic composite housing according to any one of claims 1 to 7, characterized in that The preparation method comprises:

9. A method of producing a metal-plastic composite housing according to any one of claims 1 to 8, characterized in that, Separately preparing the metal inner shell and the hard-rubber outer shell; Embedding the metal inner shell in the hard-rubber outer shell, so that the hard-rubber outer shell surrounds the metal inner shell, and the first surface of the metal inner shell facing the hard-rubber outer shell and the second surface of the hard-rubber outer shell facing the metal inner shell have a gap therebetween; Pouring liquid glue into the gap and curing to form the cured glue layer filled in the gap, thereby preparing the metal-plastic composite shell. Embedding the metal inner shell in the hard-rubber outer shell forms the gap between the first surface and the second surface based on the definition of the positioning member.

10. The method of claim 9, wherein, The positioning member includes an in-built positioning member integrally formed with the hard-rubber outer shell, which protrudes from the second surface of the hard-rubber outer shell; when the metal inner shell is embedded in the hard-rubber outer shell, the in-built positioning member abuts against the second surface of the metal inner shell, thereby defining the gap between the first surface and the second surface.

11. The method of claim 10, wherein, The positioning member further includes an auxiliary positioning member connected between the metal inner shell and the hard-rubber outer shell at the top of the metal inner shell, which has a positioning portion inserted into the gap in a shape-fitting manner.

12. The method of claim 11, wherein, The preparation method further comprises:

13. The method of any one of claims 9-12, wherein the method further comprises, Cutting the metal-plastic composite shell at the top-open end, so that the metal inner shell, the hard-rubber outer shell, and the cured glue layer have mutually flush end faces. The metal-plastic composite shell according to any one of claims 1-8 and an electronic component arranged in the containing space.

14. An electronic device, comprising: ​

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