CN110024499B

CN110024499B - Mobile terminal, structural part and manufacturing method thereof

Info

Publication number: CN110024499B
Application number: CN201780074318.6A
Authority: CN
Inventors: 黄礼忠; 乔艳党; 李威; 陈福嘉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Device Co Ltd
Priority date: 2017-07-17
Filing date: 2017-07-17
Publication date: 2021-02-23
Anticipated expiration: 2037-07-17
Also published as: CN110024499A; WO2019014811A1

Abstract

The embodiment of the application provides a mobile terminal, mobile terminal includes the structure, the structure forms an organic whole structure, and subsequent whole processing of being convenient for is favorable to the promotion of product size precision. The structural member includes: the middle plate is positioned in the mobile terminal and used for forming a middle support plate of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, and the frame inner layer and the frame outer layer are made of different materials; the contact surface of the middle plate and the inner layer of the frame is connected through welding, and the melting point of the inner layer material of the frame is the same as or similar to that of the middle plate material.

Description

Mobile terminal, structural part and manufacturing method thereof

Technical Field

The present application relates to the field of mobile terminals, and in particular, to a mobile terminal, a structural member applicable to the mobile terminal, and a method of manufacturing the structural member of the mobile terminal.

Background

In the existing mobile terminal, the appearance effect of stainless steel or titanium alloy is one of the Color, Material and Finish (CMF) effects of the mobile terminal; however, stainless steel or titanium alloy has poor heat conductivity, high density and high hardness, and is not favorable for controlling the heat dissipation, light weight and processing cost of products.

Disclosure of Invention

The application provides a mobile terminal, a structural member applicable to the mobile terminal and a method for manufacturing the structural member of the mobile terminal, aiming at improving the bonding strength of the structural member and improving the overall product performance of the mobile terminal using the structural member.

Based on the above, a first aspect of embodiments of the present application provides a method for manufacturing a structural member of a mobile terminal, which may include: forming a middle plate; forming at least one frame member, wherein the frame member is of a one-piece structure and comprises an inner frame layer and an outer frame layer, the inner frame layer and the outer frame layer are made of different materials, the melting point of the inner frame layer material is the same as or similar to that of the middle plate material, and the shape of the at least one frame member is matched with that of the middle plate; and connecting the middle plate with the contact surface of the inner layer of the frame of the at least one frame member by welding to form a structural member, wherein the at least one frame member forms a frame of the mobile terminal, and the middle plate forms a middle support plate of the mobile terminal. The one-piece structure is understood to mean a structure which is integrally formed and has certain appearance and size characteristics.

In the embodiment of the application, the middle plate and at least one frame member are formed, the shape of the at least one frame member is matched with the middle plate, and then the at least one frame member and the middle plate are connected through welding, so that the structural member can be formed. Specifically, the structural member may include an inner frame layer and an outer frame layer, wherein the inner frame layer and the outer frame layer are made of different materials and are of an integrated structure; the inner layer of the frame and the middle plate can be secondarily connected through welding, and high-strength integrated connection of dissimilar metals is integrally achieved. The subsequent integral processing is facilitated, the improvement of the product size precision is facilitated, and the matching of material attributes and product requirements is facilitated.

With reference to the first aspect of the embodiment of the present application, in a first possible implementation manner of the embodiment of the present application, the step of forming at least one frame piece may include: forming the inner frame layer and the outer frame layer into an integrated structure through a lap rolling and thermal diffusion process; blanking the unitary structure to provide the at least one frame member. It should be understood that the integrated structure formed by the pack rolling and the thermal diffusion is firmer, and the effects of meeting the requirements of users and the like can be achieved according to different material properties. Wherein, blanking refers to an operation process of taking down a material of a certain shape, quantity or quality from the whole or whole batch of materials after determining the shape, quantity or quality of the material required for manufacturing a certain device or product.

With reference to the first aspect or the first possible implementation manner of the embodiment of the present application, in a second possible implementation manner of the embodiment of the present application, the step of connecting the middle plate and the inner frame layer of the at least one frame member by welding may include: securing the at least one frame member to the midplane to form a frame; and connecting the middle plate with the contact surface of the inner layer of the frame by welding. It should be understood that when at least one frame member is connected to the middle plate by friction stir welding, at least one welding keyhole may exist, and the welding keyhole may be used to place a camera, an antenna, etc., and the space of the welding keyhole may be effectively utilized.

With reference to the first aspect or the first possible implementation manner of the embodiment of the present application, in a third possible implementation manner of the embodiment of the present application, the at least one frame member is an annular frame member, and the connecting the middle plate to the frame inner layer contact surface of the at least one frame member by welding may include: and welding the middle plate and the contact surface of the inner layer of the frame of the annular frame component, wherein the annular frame is a frame formed by punching. The whole annular frame is integrated, so that the welding connection is convenient.

With reference to the first aspect, the first to third possible implementation manners of the embodiment of the present application, in a fourth possible implementation manner of the embodiment of the present application, the step of connecting the middle plate to the frame inner layer contact surface of the at least one frame member by welding may include: the interface of the middle plate and the inner frame layer of the at least one frame member is joined by friction stir welding, electron beam welding, plasma welding or laser welding. For example: friction stir welding is difficult to connect metals (such as stainless steel and aluminum alloy) with large difference in melting points, and the melting point of the middle plate material in the embodiment of the application is the same as or similar to that of the frame inner layer material, so that the bonding strength of the frame inner layer and the middle plate in welding connection by friction stir welding is high, and the welding deformation is small; the reliability of the product is favorably improved, the structural design and the machining precision control of the product are favorably realized, and the inner layer of the frame and the middle plate can be integrally connected.

With reference to the first aspect, the first possible implementation manner to the fourth possible implementation manner of the embodiment of the present application, in a fifth possible implementation manner of the embodiment of the present application, a material of the middle plate includes an aluminum alloy, a magnesium alloy, and/or a copper alloy; the material of the inner layer of the frame comprises the aluminum alloy, the magnesium alloy and/or the copper alloy; the material of the outer layer of the frame comprises stainless steel, titanium alloy and/or ceramic. It will be appreciated that the outer layers of the frame may or may not be of the same material in the same structural member. For example: meanwhile, the outer layer materials of the frames of all the frame pieces are all stainless steel materials; when the frame outer layers of the upper frame piece and the lower frame piece are different, the frame outer layers of the left frame piece and the right frame piece are made of stainless steel materials, and the material is not limited specifically. Alternatively, the materials of the inner layers of the frame may be the same or different in the same structural member. For example: meanwhile, the inner layer materials of the frames of all the frame pieces are aluminum alloy; when the frame inner layer materials of the upper frame member and the lower frame member are different, the frame inner layer materials of the left frame member and the right frame member are aluminum alloy, and the material is not limited specifically.

If the material of frame inlayer and medium plate selection is aluminum alloy, magnesium alloy and/or when the copper alloy, can promote the product thermal diffusivity, reduce product weight, still be favorable to reducing the CNC degree of difficulty, reduce the processing cost. And the melting points of the inner layer and the middle plate of the frame are the same or similar, the bonding strength of the connection through friction stir welding is higher, and the size deformation is smaller. If the outer layer of the frame is made of stainless steel, the gloss effect of the property of the stainless steel material can be realized; if the outer layer of the frame is made of titanium alloy, the luster effect of titanium alloy can be realized; if the outer layer of the frame is made of ceramic, the luster effect of ceramic properties can be realized; and the appearance requirement of the user on the mobile terminal is met.

With reference to the first aspect of the embodiments of the present application and any one of the first to fifth possible implementation manners, in a sixth possible implementation manner of the embodiments of the present application, the middle plate and the at least one frame member are formed as an integral structure.

With reference to the first aspect and any one of the first to sixth possible implementation manners of the embodiment of the present application, in a seventh possible implementation manner of the embodiment of the present application, the thickness of the inner frame layer is greater than or equal to the thickness of the outer frame layer. Namely, the outer layer of the frame can meet the special appearance effect and simultaneously can reduce the weight of the product as much as possible.

With reference to the first aspect, any one of the first to seventh possible implementation manners of the embodiment of the present application, in an eighth possible implementation manner of the embodiment of the present application, a mechanical strength of the outer layer of the frame is greater than a mechanical strength of the inner layer of the frame. The outer frame layer and the inner frame layer are made of different materials, for example, if the mechanical strength of the outer frame layer is greater than that of the inner frame layer, the outer frame of the structural member is durable and resistant to falling. The mechanical strength may include hardness and strength, wherein the strength may be yield strength, tensile strength, among others.

With reference to the first aspect and any one of the first to eighth possible implementation manners of the embodiment of the present application, in a ninth possible implementation manner of the embodiment of the present application, the middle plate is a plate, a solid profile, a heterogeneous profile, or a hollow profile, and is not limited specifically.

With reference to the first aspect, any one of the first to ninth possible implementation manners of the embodiment of the present application, in a tenth possible implementation manner of the embodiment of the present application, the melting point of the material of the inner layer of the frame is the same as or close to the melting point of the material of the middle plate, which may include but is not limited to: the absolute value of the difference between the melting point of the frame inner layer material and the melting point of the middle plate material is smaller than a preset threshold, or the ratio of the melting point of the frame inner layer material to the melting point of the middle plate material is within a preset range, or the melting point of the frame inner layer material and the melting point of the middle plate material have the same subset melting point interval. It should be understood that materials with the same or similar melting points are easier to weld together, and the preset threshold value and the threshold value range are empirical values and can be adjusted in time according to actual requirements.

A second aspect of embodiments of the present application provides a method for manufacturing a mobile terminal, which may include: as described in the first aspect of the embodiment of the present application and any one of the first to tenth possible implementation manners of the first aspect, the structural member is manufactured, and then the mobile terminal is formed by using the structural member. And will not be described in detail herein.

A third aspect of the embodiments of the present application provides a mobile terminal, which includes a structural component, where the structural component may include: the middle plate is positioned in the mobile terminal to form a middle support plate of the mobile terminal and can be used for supporting a plurality of devices of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, wherein the frame inner layer and the frame outer layer are of an integrated structure; the contact surface of the middle plate and the inner layer of the frame is connected by friction stir welding, and the melting point of the material of the inner layer of the frame is the same as or similar to that of the material of the middle plate; the middle plate material and the inner layer material of the frame are aluminum alloy, and the outer layer material of the frame is stainless steel or titanium alloy.

In an embodiment of the present application, the structural member may include: the middle plate is positioned in the mobile terminal and used as a middle support plate of the mobile terminal, and the middle plate can be used for supporting a plurality of devices of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, wherein the frame inner layer is made of aluminum alloy, the middle plate is made of aluminum alloy, the frame outer layer is made of stainless steel or titanium alloy, and the frame inner layer and the frame outer layer are integrated due to large difference of melting points, and particularly can adopt a pack rolling and thermal diffusion process; the material of frame inlayer and medium plate all is the aluminum alloy, the joint strength who connects through friction stir welding is high, it is little to weld back size deformation, and, be favorable to product structural design and machining precision control, moreover, because the density of aluminum alloy is little, can reduce the weight of structure to a great extent, and when the outer material of frame is the stainless steel, can realize the outward appearance effect of stainless steel material again, when the outer material of frame is the titanium alloy, can realize the outward appearance effect of titanium alloy, reach consumer's outward appearance demand.

A fourth aspect of the embodiments of the present application provides a mobile terminal, where the mobile terminal includes a structural component and a plurality of devices, and the structural component may include: the middle plate is positioned in the mobile terminal to form a middle support plate of the mobile terminal and can be used for supporting a plurality of devices of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, wherein the frame inner layer and the frame outer layer are of an integrated structure, and the frame inner layer and the frame outer layer are made of different materials; the contact surface of the middle plate and the inner layer of the frame is connected by welding, and the melting point of the material of the inner layer of the frame is the same as or similar to that of the material of the middle plate. The one-piece structure is understood to mean a structure which is integrally formed and has certain appearance and size characteristics.

In this embodiment, a mobile terminal may include a structural component and a plurality of devices, where the structural component includes a middle plate and a frame, the frame is used to form a frame of the mobile terminal, and the middle plate is located in the mobile terminal and used as a middle support plate of the mobile terminal and may be used to support the plurality of devices of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, wherein the frame inner layer and the frame outer layer are of an integrated structure, and the frame inner layer and the frame outer layer are made of different materials; the inner layer of the frame and the middle plate can be connected by welding, and the melting point of the material of the inner layer of the frame is the same as or similar to that of the material of the middle plate. The structural member may support the strength of the mobile terminal. Frame inlayer and the outer formula structure as an organic whole of frame promptly, frame inlayer and medium plate can welded connection again, finally form an organic whole structure, and subsequent whole processing of being convenient for is favorable to the promotion of product size precision, is favorable to the matching of material attribute and product demand.

In combination with the fourth aspect of the embodiments of the present application, in a first implementation manner of the fourth aspect of the embodiments of the present application, the frame inner layer and the frame outer layer are formed into an integral structure through a stack rolling and thermal diffusion process. It should be understood that the integral structure formed by the pack rolling and the thermal diffusion is stronger, and can meet the requirements of users according to different material properties.

With reference to the fourth aspect or the first possible implementation manner of the embodiment of the present application, in a second possible implementation manner of the embodiment of the present application, the contact surface of the middle plate and the inner layer of the frame is connected by friction stir welding, electron beam welding, plasma welding, or laser welding. For example: friction stir welding is difficult to connect metals (such as stainless steel and aluminum alloy) with large difference in melting points, and the melting point of the middle plate material in the embodiment of the application is the same as or similar to that of the frame inner layer material, so that the bonding strength of the frame inner layer and the middle plate in welding connection by friction stir welding is high, and the welding deformation is small; the reliability of the product is favorably improved, the structural design and the machining precision control of the product are favorably realized, and the inner layer of the frame and the middle plate can be integrally connected.

With reference to the fourth aspect, the first possible implementation manner, or the second possible implementation manner of the embodiment of the present application, in a third possible implementation manner of the embodiment of the present application, a material of the middle plate includes an aluminum alloy, a magnesium alloy, and/or a copper alloy; the material of the inner layer of the frame comprises the aluminum alloy, the magnesium alloy and/or the copper alloy; the material of the outer layer of the frame comprises stainless steel, titanium alloy and/or ceramic.

With reference to the fourth aspect of the embodiment of the present application and any one of the first to third possible implementation manners, in a fourth possible implementation manner of the embodiment of the present application, the at least one frame member is connected to the middle plate by welding to form a frame. It should be understood that when at least one frame member is connected to the middle plate by friction stir welding, at least one welding keyhole may exist, and the welding keyhole may be used to place a camera, an antenna, etc., and the space of the welding keyhole may be effectively utilized.

With reference to the fourth aspect of the embodiments of the present application and any one of the first to third possible implementation manners, in a fifth possible implementation manner of the embodiments of the present application, the at least one frame member is an annular frame formed by stamping. The whole frame is integrated, so that welding connection is facilitated.

With reference to the fourth aspect of the present embodiment and any one of the first to fifth possible implementation manners of the present embodiment, in a sixth possible implementation manner of the present embodiment, the middle plate and the at least one frame member are an integral structure.

With reference to the fourth aspect of the embodiment of the present application and any one of the first to sixth possible implementation manners, in a seventh possible implementation manner of the embodiment of the present application, the thickness of the inner frame layer is greater than or equal to the thickness of the outer frame layer. Namely, the outer layer of the frame can meet the special appearance effect and simultaneously can reduce the weight of the product as much as possible.

With reference to the fourth aspect of the embodiment of the present application and any one of the first to the seventh possible implementation manners, in an eighth possible implementation manner of the embodiment of the present application, the mechanical strength of the outer layer of the frame is greater than the mechanical strength of the inner layer of the frame. The outer frame layer and the inner frame layer are made of different materials, for example, if the mechanical strength of the outer frame layer is greater than that of the inner frame layer, the outer frame of the structural member is durable and resistant to falling. The mechanical strength may include hardness and strength, wherein the strength may be yield strength, tensile strength, among others.

With reference to the fourth aspect of the embodiment of the present application and any one of the first to eighth possible implementation manners, in a ninth possible implementation manner of the embodiment of the present application, a material of the middle plate may be a plate, a solid profile, a heterogeneous profile, or a hollow profile, and is not limited specifically.

With reference to the fourth aspect of the embodiment of the present application, and any one of the first to ninth possible implementation manners, in a tenth possible implementation manner of the embodiment of the present application, the melting point of the material of the inner layer of the frame is the same as or close to the melting point of the material of the middle plate, which may include but is not limited to: the absolute value of the difference between the melting point of the frame inner layer material and the melting point of the middle plate material is smaller than a preset threshold, or the ratio of the melting point of the frame inner layer material to the melting point of the middle plate material is within a preset range, or the melting point of the frame inner layer material and the melting point of the middle plate material have the same subset melting point interval. It should be understood that materials with the same or similar melting points are easier to weld together, and the preset threshold value and the threshold value range are empirical values and can be adjusted in time according to actual requirements.

In an embodiment of the present application, a mobile terminal includes a structural component, where the structural component includes a middle plate and a frame, where the frame is used to form a frame of the mobile terminal, and the middle plate is used to form a middle support plate of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, wherein the frame inner layer and the frame outer layer are made of different materials; the inner layer of the frame and the middle plate can be connected by welding, and the melting point of the material of the inner layer of the frame is the same as or similar to that of the material of the middle plate. The bonding strength of the structural part can be improved, and the overall product performance of the mobile terminal using the structural part is improved. The frame includes frame inlayer and frame skin promptly, and frame inlayer and medium plate can welded connection again, finally form an organic whole structure, and subsequent whole processing of being convenient for is favorable to the promotion of product size precision, is favorable to the matching of material attribute and product demand.

Drawings

Fig. 1 is a schematic view of a process for manufacturing a structural member of a mobile terminal;

fig. 2 is a schematic view of another process for manufacturing a structural member of the mobile terminal;

fig. 3A is a schematic diagram of an embodiment of a structural component of a mobile terminal in an embodiment of the present application;

FIG. 3B is a schematic diagram of a pack rolling and thermal diffusion process in an embodiment of the present application;

FIG. 3C is a schematic illustration of a friction stir welding process according to an embodiment of the present application;

fig. 4A to 4O are schematic views of structural members of a mobile terminal according to an embodiment of the present disclosure;

fig. 4P is a schematic diagram of a structural member of a mobile terminal formed by machining according to an embodiment of the present application;

fig. 4Q is a schematic cross-sectional view of a structural member of a mobile terminal formed by machining in the embodiment of the present application;

FIG. 4R is a schematic illustration of the thickness of the inner frame layer and the thickness of the outer frame layer in an embodiment of the present application;

fig. 5 is a schematic diagram of an embodiment of a method for manufacturing a structural member of a mobile terminal according to an embodiment of the present application;

FIG. 6A is a schematic view of an embodiment of the present application in which the middle plate is formed of the A1 alloy;

FIG. 6B is a schematic illustration of the pack rolling and thermal diffusion process performed on the A2 alloy and the X material in an example of the present application;

FIG. 6C is a schematic view of the blanking of the sheet material to provide at least one frame member according to the present embodiment;

FIG. 6D is a schematic illustration of friction stir welding according to an embodiment of the present application;

figure 6E is a schematic illustration of a forging of a unitary structure formed by at least one frame member and a midplane according to embodiments of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In a scheme of "integral forging of stainless steel frame and middle plate + computer Numerical Control Machine (CNC)", as shown in fig. 1, a process diagram of processing a structural member of a mobile terminal is shown. The stainless steel plate is forged and pressed in multiple steps to form an initial blank, and then a final finished product is obtained through CNC + Nano injection Molding (NMT) + post-treatment + Physical Vapor Deposition (PVD) and the like. However, in this solution, stainless steel has poor thermal conductivity (thermal conductivity: 15-20W/(m. Kelvin, W/m.K)), which is disadvantageous for heat dissipation of the product; the stainless steel has high density(7.9kg/m²) The light weight of the product is not facilitated; the stainless steel has high hardness, long CNC processing time, serious cutter loss and high processing cost.

In one "swage stainless steel frame riveted (or laser welded) to die cast aluminum mid-plate". Fig. 2 is a schematic view illustrating another process for manufacturing a structural member of a mobile terminal. The stainless steel middle frame can be obtained through multi-step forging and CNC, is connected with a die-cast aluminum middle plate through riveting or laser welding, and then is subjected to CNC + NMT + post-treatment + PVD and other operations to obtain a final finished product. However, in this solution, the riveting takes up a large space, particularly in the thickness direction, which is not conducive to product design; the frame is made of stainless steel, so that the weight of the product is reduced; the frame is made of stainless steel, and the processing cost is high. The way of connecting the frame and the middle plate is: if the riveting connection mode is adopted, the riveting occupies a large space, particularly in the thickness direction, and is not beneficial to product design; if the mode of fusion welding (such as laser welding) connection is adopted, the welding bonding strength is low, the reliability control of the product is not facilitated, and the size deformation after welding is large, so that the precision control of the product is not facilitated.

In the embodiment of the application, the mobile terminal comprises a structural part and a plurality of devices, wherein the structural part comprises a middle plate and a frame, the frame is used for forming a frame of the mobile terminal, and the middle plate is positioned in the mobile terminal and used for supporting the plurality of devices of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, wherein the frame inner layer and the frame outer layer are of an integrated structure, and the frame inner layer and the frame outer layer are made of different materials; the inner layer of the frame and the middle plate can be welded to form a structural member, and the melting point of the inner layer material of the frame is the same as or similar to that of the middle plate material. Finally, an integrated structure is formed, so that the bonding strength of the middle plate, the inner layer of the frame and the outer layer of the frame is effectively improved, the subsequent integral processing is facilitated, the improvement of the size precision of the product is facilitated, and the matching of the material property and the product requirement is facilitated.

The technical solution of the present application is further described below by way of an embodiment, as shown in fig. 3A, which is a schematic diagram of an embodiment of a mobile terminal in the embodiment of the present application; the mobile terminal includes a structure 30, and the structure 30 includes:

middle plate 301 and frame 302, frame 302 is used to form the frame of the mobile terminal, middle plate 301 is used to form the middle support plate of the mobile terminal, and can support several devices of the mobile terminal; the frame 302 comprises a frame inner layer 3021 and a frame outer layer 3022, the frame inner layer 3021 and the frame outer layer 3022 are of an integral structure, and the frame inner layer 3021 and the frame outer layer 3022 are made of different materials; the contact surface of the middle plate 301 and the inner frame layer 3021 is connected by welding, and the melting point of the material of the inner frame layer 3021 is the same as or similar to that of the middle plate 301.

In the embodiment of the application, the mobile terminal comprises a structural part and also comprises a plurality of devices; the structural member also comprises a middle plate and a frame, the frame comprises a frame inner layer and a frame outer layer, the frame inner layer and the frame outer layer are of an integrated structure, and the frame inner layer and the frame outer layer are made of different materials; the inner layer of the frame and the middle plate can be connected by welding, and the melting point of the material of the inner layer of the frame is the same as or similar to that of the material of the middle plate; the frame is used for forming a frame of the mobile terminal, the middle plate is positioned in the mobile terminal and serves as a middle support plate of the mobile terminal, and a plurality of devices of the mobile terminal can be arranged on the middle plate. The structural member may support the strength of the mobile terminal. Frame inlayer and the outer formula structure as an organic whole of frame promptly, frame inlayer and medium plate can welded connection again, finally form a body structure, not only effectively improve medium plate, the outer joint strength of frame inlayer and frame, and the subsequent whole processing of being convenient for is favorable to the promotion of product size precision, is favorable to the matching of material attribute and product demand. The one-piece structure is understood to mean a structure which is integrally formed and has certain appearance and size characteristics.

Alternatively, in some embodiments of the present application, the melting point of the material of inner frame layer 3021 may be the same as or similar to the melting point of the material of middle plate 301, including but not limited to: the absolute value of the difference between the melting point of the material of frame interior layer 3021 and the melting point of the material of midplane 301 is less than a preset threshold, or the ratio of the melting point of the material of frame interior layer 3021 to the melting point of the material of midplane 301 is within a preset range, or there is the same subset melting point interval between the melting point of the material of frame interior layer 3021 and the melting point of the material of midplane 301. It should be understood that materials with the same or similar melting points are easier to weld together, and the preset threshold value and the threshold value range are empirical values and can be adjusted in time according to actual requirements. For example, this preset threshold may be 300 ℃ or 400 ℃ or the like; the predetermined range may be between 0.5 and 1.5 (e.g., the mid-plate material and the frame inner material are both aluminum alloys and may have the same melting point, with a ratio of 1 between 0.5 and 1). There are the same subset melting point intervals such as: the melting point range of the aluminum alloy may be: 450-660 ℃, and the melting point range of the magnesium alloy can be as follows: 430-650 deg.c, then the same subset melting point interval exists for 430-650 deg.c.

It should be understood that the mobile terminal may include any terminal device such as a mobile phone, a tablet computer, a Personal Digital Assistant (PDA), a Point of Sales (POS), a vehicle-mounted computer, a wearable device, and so on. The plurality of devices may include devices of the mobile terminal such as a battery, a main board, a front camera, a rear camera, a sound, a vibration motor, and the like.

Alternatively, in some embodiments of the present application, the inner frame layer 3021 and the outer frame layer 3022 are formed as a unitary structure through a roll-to-roll and thermal diffusion process. It should be understood that the integral structure formed by the pack rolling and the thermal diffusion is stronger, and can meet the requirements of users according to different material properties.

Illustratively, as shown in fig. 3B, a schematic diagram of the roll-on and thermal diffusion process in the examples of the present application is shown. In practical application, (1) the material A and the material B can be subjected to surface treatment (such as oil stain cleaning, electric brush polishing and oxide layer removal) to clean a joint surface; (2) then overlapping the material A and the material B (for example, using rivets to fix in advance); (3) placing the superposed material A and the superposed material B into a roller for carrying out lap-rolling connection to form an A + B material; (4) and finally, carrying out thermal diffusion treatment on the A + B material to ensure that atoms of the bonding interface are mutually diffused and enhance the bonding strength of the interface.

Optionally, in some embodiments of the present application, the interface of midplane 301 and frame inner layer 3021 is connected by friction stir welding, electron beam welding, plasma welding or laser welding. It should be noted that, when middle plate 301 and frame inner layer 3021 are welded, in a possible implementation manner, the contact surface between middle plate 301 and frame inner layer 3021 may be welded completely, that is, the contact surface between middle plate 301 and frame inner layer 3021 is welded completely, not by interval welding, not by spot welding, not by welding through several connecting members, and compared with the existing welding connection and gluing, the mechanical strength of the middle plate and frame inner layer has very good mechanical properties, such as a bonding degree, an overall mechanical strength, and the like. In another possible implementation manner, the contact surfaces of the middle plate 301 and the inner layer 3021 of the frame are all connected by friction stir welding, and there may be at least one welding keyhole, it should be understood that in practical product applications, the welding keyhole may be used to place a camera, an antenna, and the like, and the space of the welding keyhole may be effectively utilized.

As briefly described herein, friction stir welding may be used to join two metals of different or the same material. FIG. 3C is a schematic illustration of a friction stir welding process according to an embodiment of the present invention.

The friction stir welding process comprises the following steps: a cylindrical stirring head with a special shaft shoulder and a pin boss is rotatably inserted into a workpiece to be welded, friction between the stirring head and the material to be welded generates frictional heat to thermoplasticize the material to be welded, the thermoplasticized material is transferred from the front portion to the rear portion of the stirring head when the stirring tool moves forward along an interface to be welded, and solid-phase connection between the workpieces is realized under the mechanical forging action of the stirring tool.

Friction stir welding has the following advantages: the solid phase connection is adopted, the performance of the joint is excellent, and the fusion welding defect is small; the influence of artificial factors is small in the mechanized implementation process; before welding, beveling and special cleaning are not needed; the welding deformation and shrinkage are small; no welding smoke dust and splash, no ultraviolet and electromagnetic radiation; protective gas and filling materials are not needed; the method is green and environment-friendly and has no pollution; the production efficiency is high, and for example, 1-50mm welding seams can be completely welded at one time.

However, friction stir welding is difficult to connect metals with large difference in melting points (such as stainless steel and aluminum alloy), and in the embodiment of the present application, the absolute value of the difference between the melting point of the material of the middle plate 301 and the melting point of the material of the frame inner layer 3021 is smaller than a preset threshold, or the ratio between the melting point of the material of the frame inner layer 3021 and the melting point of the material of the middle plate 301 is within a preset range, or the melting point of the material of the frame inner layer 3021 and the melting point of the material of the middle plate 301 have the same subset melting point interval, so that the bonding strength of the welding connection of the frame inner layer 3021 and the middle plate 301 by friction stir welding is relatively high, and the welding; the reliability of the product is improved, the structural design and the machining precision of the product are controlled, and the inner layer 3021 of the frame and the middle plate 301 can be integrally connected.

Optionally, in some embodiments of the present application, the material of the middle plate 301 includes an aluminum alloy, a magnesium alloy, and/or a copper alloy; the material of the frame inner layer 3021 includes aluminum alloy, magnesium alloy, and/or copper alloy; the material of the frame outer layer 3022 includes stainless steel, titanium alloy, and/or ceramic. It should be understood that the frame outer layer 3022 may or may not be the same material in the same structural member 30. For example: meanwhile, the outer layer materials of the frames of all the frame pieces are all stainless steel materials; when the frame outer layers of the upper frame piece and the lower frame piece are different, the frame outer layers of the left frame piece and the right frame piece are made of stainless steel materials, and the material is not limited specifically. Alternatively, the frame inner layer 3021 may or may not be the same material in the same structural member 30. For example: meanwhile, the inner layer materials of the frames of all the frame pieces are aluminum alloy; when the frame inner layer materials of the upper frame member and the lower frame member are different, the frame inner layer materials of the left frame member and the right frame member are aluminum alloy, and the material is not limited specifically.

For example, the aluminum alloy melting point range may be: 450-660 ℃, and the melting point range of the magnesium alloy can be as follows: 430 ℃ and 650 ℃, the melting point range of the stainless steel can be as follows: 1200 ℃ and 1550 ℃. (1) When the middle plate 301 is made of aluminum alloy, the inner frame layer 3021 is made of aluminum alloy, and the outer frame layer 3022 is made of stainless steel, the outer frame layer 3022 can achieve an appearance effect of the property of the stainless steel, the difference between the melting points of the inner frame layer 3021 and the outer frame layer 3022 is large, the inner frame layer and the outer frame layer can be connected through a roll-on and thermal diffusion process, then the melting points of the middle plate 301 and the inner frame layer 3021 are close, high-strength connection is easily achieved through friction stir welding, finally, an integral structure is formed, common procedures such as CNC, NMT, surface treatment, PVD and the like can be performed on the integral structure, and a structural member of the mobile terminal is obtained.

(2) When the middle plate 301 is made of aluminum alloy, the inner frame layer 3021 is made of aluminum alloy, and the outer frame layer 3022 is made of titanium alloy, the outer frame layer 3022 can achieve an appearance effect of a property of the titanium alloy, the difference between the melting points of the inner frame layer 3021 and the outer frame layer 3022 is large, the inner frame layer 3021 and the outer frame layer 3022 can be connected through a lap rolling and thermal diffusion process, then the melting points of the middle plate 301 and the inner frame layer 3021 are close, high-strength connection is easily achieved through friction stir welding, finally, an integral structure is formed, common procedures such as CNC, NMT, surface treatment, PVD and the like can be performed on the integral structure, and a structural member of the mobile terminal is obtained.

Optionally, in some embodiments of the present application, the frame 302 is a frame formed by at least one frame member connected to a midplane by welding. It should be appreciated that when at least one frame member is joined to the middle plate 301 by friction stir welding, there may be at least one welding keyhole, which may be used to position a camera, antenna, etc., and the space of the welding keyhole may be effectively utilized.

As shown in fig. 4A-4B, the frame 302 is a structural member of the mobile terminal according to the present embodiment. For example, in the schematic view of fig. 4A, there is a structural gap, the entire frame 302 is integral to facilitate the welding connection, and this gap can be used as an antenna gap later, and is placed on the top layer to better match the antenna design.

As shown in fig. 4C-4H, which are several examples of structural members of the mobile terminal in the embodiment of the present application, the frame 302 is composed of two structural members. For example, in the schematic diagrams shown in fig. 4C and 4G, there are two structural member slots that may better fit an antenna or other structural design.

As shown in fig. 4I-4K, which are several examples of structural members of the mobile terminal in the embodiment of the present application, the frame 302 is composed of three structural members. For example, in the schematic views of fig. 4I and 4J, there are three structural member slits, one in the top layer and two in the bottom layer or two on the two sides, and the two structural member slits are symmetrical and can be used as antenna slits as a whole and are attractive.

As shown in fig. 4L-4N, which are several examples of structural members of the mobile terminal in the embodiment of the present application, the frame 302 is composed of four structural members. For example, in the schematic diagrams shown in fig. 4L and 4M, there are four structural member slits, which are symmetrical up and down, left and right, and can be used as antenna slits and are relatively beautiful.

It should be noted that fig. 4A to 4N are only a few schematic diagrams of the structural components of the mobile terminal, and the structural components of the mobile terminal actually produced include, but are not limited to, those shown in fig. 4A to 4N.

Optionally, in some embodiments of the present application, the frame 302 is a ring-shaped frame formed by stamping. Illustratively, as shown in fig. 4O, another schematic diagram of the structural component of the mobile terminal in the embodiment of the present application is shown.

Optionally, in some embodiments of the present application, midplane 301 and frame 302 are a unitary structure. Illustratively, fig. 4P is another schematic view of the structural member of the formed mobile terminal, and fig. 4Q is a schematic cross-sectional view of the structural member of the formed mobile terminal.

Optionally, in some embodiments of the present application, the shape of the frame 302 and the shape of the middle plate 301 are matched to each other.

Optionally, in some embodiments of the present application, the middle plate 301 is a plate formed into a desired shape and size by punching, sawing, forging, or CNC, or alternatively, a plate formed by casting.

Optionally, in some embodiments of the present application, thickness L1 of frame inner layer 3021 is equal to or greater than thickness L2 of frame outer layer 3022. For example, the thickness L1 of the inner frame layer may be between 2mm and 10mm, and specifically, the thickness L1 of the inner frame layer may be 6mm, 7mm, etc., which may be determined according to actual needs; the thickness L2 of the frame outer layer may be between 0.1 mm and 2mm, and specifically, the thickness L2 of the frame outer layer may be 0.8mm, 0.6mm, etc., which may be determined according to actual requirements. That is, the frame outer layer 3022 can reduce the weight of the product as much as possible while satisfying specific appearance effects and product size requirements. As shown in fig. 4R, a schematic view of the thickness of the inner layer of the frame and the thickness of the outer layer of the frame is shown.

Optionally, in some embodiments of the present application, the mechanical strength of the outer layer of the frame is greater than the mechanical strength of the inner layer of the frame. The mechanical strength may include hardness and strength, and may be represented by a material density of the X material being greater than that of the a2 alloy, wherein the strength may be yield strength and tensile strength. The material of outer frame layer 3022 is different from the material of inner frame layer 3021, and if the mechanical strength of outer frame layer 3022 is greater than the mechanical strength of inner frame layer 3021, the resulting frame of the structural member is more durable and resistant to falling.

Optionally, in some embodiments of the present application, the middle plate 301 may be a plate, a solid profile, a heterogeneous profile, or a hollow profile, which is not limited specifically.

In the embodiment of the application, the structural member of the mobile terminal comprises a middle plate and a frame, wherein the frame is used for forming a frame of the mobile terminal, and the middle plate is positioned in the mobile terminal and used for supporting a plurality of devices of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, the frame inner layer and the frame outer layer are made of different materials and can be connected into an integrated structure through a pack rolling and thermal diffusion process to realize the integrated connection of dissimilar metals, and then the frame inner layer and the middle plate can be connected for the second time through friction stir welding, electron beam welding, plasma welding or laser welding technology to realize the high-strength integrated connection of the dissimilar metals; and then carrying out processes such as integral forging, CNC, NMT, forming, surface treatment, PVD and the like to form the appearance effect of materials such as stainless steel, titanium alloy or ceramics and the effect of the internal structure of materials such as aluminum alloy, magnesium alloy or copper alloy. If the inner layer and the middle plate of the frame are made of aluminum alloy, the bonding strength through friction stir welding is higher, and the heat dissipation performance of the product can be improved due to the high heat conductivity of the aluminum alloy; the aluminum alloy has lower density, can reduce the weight of the product, and can reduce the processing cost by utilizing the easy-cutting property of the aluminum alloy.

It should be noted that, in combination with the above embodiments, in one possible implementation manner, the mobile terminal includes a structural component 30, and the structural component 30 includes:

middle plate 301 and frame 302, where frame 302 is used to form a frame of the mobile terminal, middle plate 301 is located in the mobile terminal to form an intermediate support plate of the mobile terminal, and may be used to support several devices of the mobile terminal; the frame 302 comprises a frame inner layer 3021 and a frame outer layer 3022, the frame inner layer 3021 and the frame outer layer 3022 are of an integral structure, and the frame inner layer 3021 and the frame outer layer 3022 are made of different materials; the contact surface of the middle plate 301 and the inner layer 3021 of the frame is connected by friction stir welding, and the melting point of the material of the inner layer 3021 of the frame is the same as or similar to that of the material of the middle plate 301; the material of the outer frame layer 3022 is stainless steel, and the material of the inner frame layer 3021 and the middle plate 301 is aluminum alloy.

In the embodiment of the application, the structural member of the mobile terminal comprises a middle plate and a frame, the frame is used for forming a frame of the mobile terminal, and the middle plate is located in the mobile terminal and used as a middle support plate of the mobile terminal and can be used for supporting a plurality of devices of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, and the frame inner layer and the frame outer layer are made of different materials; the inner layer of the frame is made of aluminum alloy, the middle plate is made of aluminum alloy, and the outer layer of the frame is made of stainless steel, so that the inner layer of the frame and the outer layer of the frame have large melting point difference and are of an integrated structure, and particularly, the inner layer of the frame and the outer layer of the frame can be of an integrated structure by adopting a rolling and thermal diffusion process; the material of frame inlayer and medium plate all is the aluminum alloy, and the joint strength who connects through friction stir welding is high, and the postweld size deformation is little, moreover, is favorable to product structural design and machining precision control, moreover, because the density of aluminum alloy is little, can reduce the weight of structure to a great extent, and when the outer material of frame was the stainless steel, can realize stainless steel material's outward appearance effect again, reaches consumer's outward appearance demand.

With reference to the foregoing embodiment, in another possible implementation manner, the mobile terminal includes a structural component 30 and a plurality of devices, where the structural component 30 includes:

a middle plate 301 and a frame 302, wherein the frame 302 is used for forming a frame of the mobile terminal, and the middle plate 301 is used for forming a middle support plate of the mobile terminal; the frame 302 comprises a frame inner layer 3021 and a frame outer layer 3022, wherein the frame inner layer 3021 and the frame outer layer 3022 are made of different materials; the contact surface of the middle plate 301 and the inner layer 3021 of the frame is connected by friction stir welding, and the melting point of the material of the inner layer 3021 of the frame is the same as or similar to that of the material of the middle plate 301; the material of the outer frame layer 3022 is titanium alloy, and the material of the inner frame layer 3021 and the middle plate 301 is aluminum alloy.

In the embodiment of the application, the structural member of the mobile terminal comprises a middle plate and a frame, the frame is used for forming a frame of the mobile terminal, and the middle plate is located in the mobile terminal and used as a middle support plate of the mobile terminal and can be used for supporting a plurality of devices of the mobile terminal; the frame comprises a frame inner layer and a frame outer layer, and the frame inner layer and the frame outer layer are made of different materials; the inner layer of the frame is made of aluminum alloy, the middle plate is made of aluminum alloy, and the outer layer of the frame is made of stainless steel, so that the inner layer of the frame and the outer layer of the frame have large melting point difference and are of an integrated structure, and particularly, the inner layer of the frame and the outer layer of the frame can be of an integrated structure by adopting a rolling and thermal diffusion process; the materials of the inner layer and the middle plate of the frame are all aluminum alloys, the bonding strength of the connection through friction stir welding is high, the size deformation after welding is small, the structural design and the machining precision control of the product are facilitated, in addition, the weight of the structural part can be reduced to a great extent due to the small density of the aluminum alloys, and when the material of the outer layer of the frame is a titanium alloy, the appearance effect of the titanium alloy material can be realized, and the appearance requirement of a consumer is met.

In the following, a method for manufacturing a structural member of a mobile terminal in an embodiment of the present application is further described, as shown in fig. 5, which is a schematic diagram of an embodiment of a structural member of a mobile terminal in an embodiment of the present application, and includes:

501. and processing to form the middle plate.

In the embodiment of the present application, the material of the middle plate is abbreviated as a1 alloy, and the a1 alloy may include aluminum alloy, magnesium alloy, copper alloy, and/or the like. As shown in fig. 6A, a schematic view of the processing of the a1 alloy to form a midplane, wherein the midplane is located in the mobile terminal for supporting devices of the mobile terminal. That is, the A1 alloy can be punched, sawed, forged or CNC formed to obtain the middle plate with required shape and size. The A1 alloy may be plate, solid section, hollow or special-shaped section. It should be understood that the middle plate may also be a cast plate, which is not particularly limited; the formed middle plate may then be subjected to a cleaning process.

502. And processing to form at least one frame member, wherein the at least one frame member comprises an inner frame layer and an outer frame layer, the inner frame layer and the outer frame layer are of an integrated structure, and the inner frame layer and the outer frame layer are made of different materials.

In an embodiment of the present application, the step of forming at least one frame member may include: forming the inner layer and the outer layer of the frame into an integrated structure through the processes of pack rolling and thermal diffusion; blanking the unitary structure to provide at least one frame member. The sheet material is formed into at least one frame member, and the sheet material is connected into an integral structure by at least two different materials, specifically, the sheet material can be connected into the integral structure by at least two different materials through a rolling and thermal diffusion process. The one-piece structure is understood to mean a structure which is integrally formed and has certain appearance and size characteristics. It should be understood that the timing of

steps

501 and 502 is not limited, and steps 501 and 502 are optional steps.

Illustratively, the material of the inner layer of the plate is called A2 alloy for short, and the material of the outer layer is called appearance material, called X material for short. The a2 alloy may include aluminum alloys, magnesium alloys, and/or copper alloys, among others; the X material may include stainless steel, titanium alloy and/or ceramic, and the X material and the a2 alloy may be connected into an integrated structure through a rolling and thermal diffusion process, as shown in fig. 6B, and for a detailed process of connecting the X material and the a2 alloy into an integrated structure, reference may be made to the above-mentioned fig. 3B, which is not described herein again.

Optionally, the thickness of the a2 alloy is greater than or equal to that of the X material, so that the weight of the product can be reduced as much as possible. For example, the thickness L1 of the inner frame layer may be between 2mm and 10mm, and specifically, the thickness L1 of the inner frame layer may be 6mm, 8mm, etc., which may be determined according to actual needs; the thickness L2 of the frame outer layer may be between 0.1 mm and 2mm, and specifically, the thickness L2 of the frame outer layer may be 0.8mm, 0.6mm, etc., which may be determined according to actual requirements. Optionally, the mechanical strength of the X material is greater than that of the a2 alloy, wherein the mechanical strength may include hardness and strength, and may be embodied as the material density of the X material is greater than that of the a2 alloy, wherein the strength may be yield strength and tensile strength. Namely the frame of the structural member formed by the X material, is durable and anti-falling.

Then blanking the plate to obtain at least one frame piece with a required shape and size, wherein the at least one frame piece comprises a frame inner layer and a frame outer layer, the frame inner layer and the frame outer layer are of an integrated structure, and the frame inner layer and the frame outer layer are made of different materials; the at least one frame member may then be subjected to a cleaning process. As shown in fig. 6C, a schematic view of at least one frame member is obtained for blanking the sheet material. Wherein, blanking refers to an operation process of taking down a material of a certain shape, quantity or quality from the whole or whole batch of materials after determining the shape, quantity or quality of the material required for manufacturing a certain device or product.

Wherein, the number of the frame members can be 1, 2, 3 or 4, etc., according to the actual requirement. If the frame piece is a frame piece, the frame piece can be an annular frame formed by stamping and is matched with the middle plate; if at least 2, 3 or 4 frame members are welded to the middle plate, a frame can be formed, which is shaped to fit the middle plate. It should be understood that the frame is used to form the bezel of the mobile terminal.

503. And connecting the middle plate with the contact surface of the inner layer of the frame of at least one frame member by welding to form a structural member.

In an embodiment of the present application, the connecting the middle plate and the inner frame layer of the at least one frame member by welding may include: (1) connecting the contact surface of the middle plate and the inner layer of the frame of at least one frame member by friction stir welding, electron beam welding, plasma welding or laser welding; or, (2) fixing at least one frame member to the middle plate to form a frame; connecting the contact surface of the inner layer of the frame and the middle plate by welding; alternatively, (3) the at least one frame member is an annular frame member, and the welding of the interface between the middle plate and the inner frame layer of the at least one frame member may include: the contact surface between the frame inner layer of the annular frame member and the middle plate is connected by welding, and the annular frame is a frame formed by punching.

At least one frame member and the middle plate can be positioned through the clamping jig, and are connected through friction stir welding, electron beam welding, plasma welding or laser welding to form a high-strength connection integrated structure. As shown in fig. 6D, a schematic view of welding by friction stir welding is shown, wherein the welding path is not limited to a straight path, but may be a curved path or the like. It should be understood that the welding may be completed in one welding step, that is, from beginning to end, or may be completed in a first welding step, which is not completed, and then completed in a subsequent welding step, which is not limited in particular. As shown in any of fig. 4A-4O, which are several schematic views of the structural members welded as an integral structure in the embodiment of the present application, detailed description thereof is omitted here. The melting point of the a1 alloy is the same as or similar to the melting point of the a2 alloy. Specifically, the absolute value of the difference between the melting point of the a1 alloy and the melting point of the a2 alloy is smaller than a preset threshold, or the ratio of the melting point of the a1 alloy to the melting point of the a2 alloy is within a preset range, or the melting point of the a1 alloy and the melting point of the a2 alloy have the same subset melting point interval. It should be understood that materials with similar melting points are easier to connect together by friction stir welding, and the preset threshold and the threshold range are empirical values and can be adjusted in time according to actual requirements, for example, the preset threshold may be 300 ℃; the preset range can be between 0.5 and 1.5 (for example, the middle plate material and the inner layer material of the frame are both aluminum alloy, the melting points can be the same, the ratio is 1, and the ratio is between 0.5 and 1); there are the same subset melting point intervals such as: the melting point range of the aluminum alloy may be: 450-660 ℃, and the melting point range of the magnesium alloy can be as follows: 430-650 deg.c, then the same subset melting point interval exists for 430-650 deg.c.

Illustratively, the a1 alloy is an aluminum alloy, the melting point range of the aluminum alloy can be 450-: 430-650 ℃, the X material is stainless steel, and the melting point range of the stainless steel can be as follows: 1200 ℃ and 1550 ℃.

When the A1 alloy is made of aluminum alloy, the A2 alloy is made of aluminum alloy, and the X material is stainless steel, the X material can achieve the appearance effect of the property of the stainless steel material, the melting points of the X material and the A2 alloy are different greatly and can be connected through a pack rolling and thermal diffusion process, then the melting points of the A1 alloy and the A2 alloy are close, high-strength connection is achieved easily through friction stir welding, finally, an integral structure is formed, common procedures such as CNC, NMT, surface treatment, PVD and the like can be conducted on the integral structure, and the structural member of the mobile terminal is obtained.

When the A1 alloy material is an aluminum alloy, the A2 alloy material is an aluminum alloy, and the X material is a titanium alloy, the X material can realize the appearance effect of the titanium alloy material property, the melting points of the X material and the A2 alloy have large difference, the X material and the A2 alloy can be connected through a lap-rolling and thermal diffusion process, then the melting points of the A1 alloy and the A2 alloy are close, high-strength connection is easily realized through friction stir welding, finally, an integral structure is formed, common procedures such as CNC, NMT, surface treatment, PVD and the like can be carried out on the integral structure, and the structural member of the mobile terminal is obtained.

If the material of A2 alloy and A1 alloy selection is aluminum alloy, magnesium alloy or copper alloy, can promote the product thermal diffusivity, reduce product weight, still be favorable to reducing the CNC degree of difficulty, reduce processing cost. Therefore, the melting point of the a1 alloy is not much different from that of the a2 alloy, the bonding strength of the friction stir welding connection is high, and the dimensional deformation is small. If the X material is stainless steel, the gloss effect of the property of the stainless steel material can be realized; if the outer layer of the frame is made of titanium alloy, the luster effect of titanium alloy can be realized; if the outer layer of the frame is made of ceramic, the luster effect of ceramic properties can be realized; and the appearance requirement of the user on the mobile terminal is met.

It should be understood that the number of frame members may be four frame members welded to the middle plate, or two, three or another number of frame members welded to the middle plate; the middle plate can be welded on one side and welded on two sides; or the plate is punched and formed into an annular frame or a ring-shaped frame, the annular frame and the middle plate are matched in shape, and then the annular frame and the middle plate are welded and connected, and the method is not limited specifically. In a possible implementation, the contact surface of the middle plate and the inner layer of the frame can be welded completely, not at intervals, not spot-welded, not welded through a plurality of connecting pieces, and compared with the existing welding connection and gluing connection, the middle plate has very good mechanical properties, such as combination degree, overall mechanical strength and the like. In another possible implementation manner, the contact surface of the middle plate and the inner layer of the frame can be welded completely through friction stir welding, and at least one welding keyhole can exist. For the description of friction stir welding, reference may be made to the description shown in fig. 3C, which is not described herein again.

The friction stir welding is difficult to connect metals with large difference in melting points (such as stainless steel and aluminum alloy), while in the embodiment of the present invention, the absolute value of the difference between the melting point of the middle plate (a1 alloy) and the melting point of the frame inner layer (a2 alloy) is smaller than a preset threshold, or the ratio of the melting point of the frame inner layer (a2 alloy) to the melting point of the middle plate (a1 alloy) is within a preset range, or a subset melting point interval exists between the melting point of the frame inner layer (a2 alloy) and the melting point of the middle plate (a1 alloy), so that the welding strength of the welding connection of the frame inner layer and the middle plate by friction stir welding is relatively high in the present invention, and the welding deformation is relatively small; the reliability of the product is favorably improved, the structural design and the machining precision control of the product are favorably realized, and the inner layer of the frame and the middle plate can be integrally connected.

The choice of the a1 alloy/a 2 alloy may be: aluminum alloy/aluminum alloy, aluminum alloy/magnesium alloy, magnesium alloy/aluminum alloy, magnesium alloy/magnesium alloy, copper alloy/copper alloy, and the like. The recipes for the X material, the a2 alloy, and the a1 alloy include, but are not limited to, those shown in table 1 below:

material	X material	A2 alloy	A1 alloy
				Use of	Realizing the appearance effect	For joining with A1 alloy	Middle plate (inner cavity) structure
Combination
	1	Stainless steel	Aluminium alloy	Aluminium alloy
Combination
	2	Stainless steel	Aluminium alloy	Magnesium alloy
Combination
	3	Stainless steel	Magnesium alloy	Aluminium alloy
Combination
	4	Stainless steel	Magnesium alloy	Magnesium alloy
Combination 5					Stainless steel	Copper alloy	Copper alloy
	Combination 6	Titanium alloy	Aluminium alloy	Aluminium alloy
Combination 7					Titanium alloy	Aluminium alloy	Magnesium alloy
	Combination 8	Titanium alloy	Magnesium alloy	Aluminium alloy
Combination 9					Titanium alloy	Magnesium alloy	Magnesium alloy
	Assembly 10	Titanium alloy	Copper alloy	Copper alloy
Combination 11					Ceramic material	Aluminium alloy	Aluminium alloy
	Combination 12	Ceramic material	Aluminium alloy	Magnesium alloy
Combination 13					Ceramic material	Magnesium alloy	Aluminium alloy
	Combination 14	Ceramic material	Magnesium alloy	Magnesium alloy
Assembly 15					Ceramic material	Copper alloy	Copper alloy

TABLE 1

It should also be noted that the materials of the frame outer layers may be the same or different in the same structural member. For example: meanwhile, the outer layer materials of the frames of all the frame pieces are all stainless steel materials; when the frame outer layers of the upper frame piece and the lower frame piece are different, the frame outer layers of the left frame piece and the right frame piece are made of stainless steel materials, and the material is not limited specifically; alternatively, the materials of the inner layers of the frame may be the same or different. For example: meanwhile, the inner layer materials of the frames of all the frame pieces are aluminum alloy; when the frame inner layer materials of the upper frame member and the lower frame member are different, the frame inner layer materials of the left frame member and the right frame member are aluminum alloy, and the material is not limited specifically.

In the present embodiment, as shown in FIG. 6E, a schematic view of the forging of the unitary structure formed by at least one frame member and the midplate is also provided. The integral structure of the high-strength connection can be formed into a primary profile with appearance requirements by adopting a forging or stamping process, and the primary profile with appearance requirements can also be formed by subsequent machining. Further, the finished product is processed through common procedures such as CNC, NMT, surface treatment, PVD and the like, and the finished product is a schematic diagram of a processed and formed structural member as shown in the 4P-4Q.

In an embodiment of the present application, the structural member is formed by forming the midplane and the at least one frame member and then joining the at least one frame member to the midplane by welding. Specifically, the structural member may include an inner frame layer and an outer frame layer, the inner frame layer is made of a2 alloy, and the outer frame layer is made of an X material. The X material and the A2 alloy are different in material and can be connected into an integrated structure through a pack rolling and thermal diffusion process to realize the integrated connection of dissimilar metals, and then the A2 alloy and the A1 alloy can be secondarily connected through friction stir welding, electron beam welding, plasma welding or laser welding technology to integrally realize the high-strength integrated connection of the dissimilar metals; and then carrying out processes such as integral forging, CNC, NMT, forming, surface treatment, PVD and the like to form the appearance effect of materials such as stainless steel, titanium alloy or ceramics and the effect of the internal structure of materials such as aluminum alloy, magnesium alloy or copper alloy. The frame is used for forming a frame of the mobile terminal, and the middle plate is located in the mobile terminal and used for supporting a plurality of devices of the mobile terminal. If the A1 alloy and the A2 alloy are made of aluminum alloys, the bonding strength of friction stir welding connection is high, and the heat dissipation performance of the product can be improved due to the high heat conductivity of the aluminum alloys; the aluminum alloy has lower density, can reduce the weight of the product, and can reduce the processing cost by utilizing the easy-cutting property of the aluminum alloy. Moreover, the X material is stainless steel, titanium alloy and the like, and the appearance effect of the stainless steel or the titanium alloy can be achieved.

It should be noted that, the embodiment of the present application further provides a method for manufacturing a mobile terminal, where the method includes any one of the methods in the embodiments shown in fig. 5, and the mobile terminal is formed by using the structural component, which is not described herein again.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of manufacturing a structural member of a mobile terminal, the method comprising:

forming a middle plate;

forming at least one frame member, wherein the frame member comprises an inner frame layer and an outer frame layer, the inner frame layer and the outer frame layer are made of different materials, the melting point of the inner frame layer is the same as or similar to that of the middle plate material, and the shape of the at least one frame member is matched with that of the middle plate; the thickness of the inner frame layer is greater than or equal to that of the outer frame layer; the mechanical strength of the outer layer of the frame is greater than that of the inner layer of the frame;

welding and connecting the middle plate with the contact surface of the inner layer of the frame of the at least one frame member to form a structural member, and carrying out Computer Numerical Control (CNC) process processing on the structural member; the at least one frame element forms a bezel of the mobile terminal, the midplane forms a middle support board of the mobile terminal;

the step of forming at least one frame member includes:

forming the inner frame layer and the outer frame layer into an integrated structure through a pack rolling and thermal diffusion process;

blanking the integrated structure to obtain the at least one frame piece;

the step of connecting the middle plate to the frame inner layer contact surface of the at least one frame member by welding includes:

and connecting the contact surface of the middle plate and the inner layer of the frame of the at least one frame member by friction stir welding, electron beam welding, plasma welding or laser welding.

2. The method of claim 1, wherein said step of joining said interface of said middle plate to said inner frame layer of said at least one frame member by welding comprises:

securing said at least one frame member to said midplane to form a frame;

and connecting the middle plate with the contact surface of the inner layer of the frame by welding.

3. The method of claim 1, wherein the at least one frame member is an annular frame member, and wherein the step of attaching the mid-plate to the frame inner layer interface of the at least one frame member by welding comprises:

and connecting the middle plate with the frame inner layer contact surface of the annular frame piece by welding, wherein the annular frame piece is a stamping formed frame.

4. The method according to any one of claims 1 to 3,

the middle plate is made of aluminum alloy, magnesium alloy and/or copper alloy;

the material of the frame inner layer comprises the aluminum alloy, the magnesium alloy and/or the copper alloy;

the material of the outer layer of the frame comprises stainless steel, titanium alloy and/or ceramic.

5. The method of any one of claims 1-3, wherein the frame inner layer material having a melting point that is the same as or similar to the melting point of the middle plate material comprises:

the absolute value of the difference between the melting point of the inner layer material of the frame and the melting point of the middle plate material is smaller than a preset threshold value; alternatively, the first and second electrodes may be,

the ratio of the melting point of the inner layer material of the frame to the melting point of the middle plate material is within a preset range; alternatively, the first and second electrodes may be,

the melting point of the frame inner layer material and the melting point of the middle plate material have the same subset melting point interval.

6. The method according to any one of claims 1 to 3, wherein the middle plate is a plate, a solid profile, a heterogeneous profile or a hollow profile.

7. A method of manufacturing a mobile terminal, wherein the method comprises:

manufacturing the structural member by using the method according to any one of claims 1 to 6;

and forming the mobile terminal by using the structural member.

8. A mobile terminal, characterized in that the mobile terminal comprises a structure, the structure comprising:

the mobile terminal comprises a middle plate and a frame, wherein the frame is used for forming a frame of the mobile terminal, and the middle plate is used for forming a middle supporting plate of the mobile terminal;

the frame comprises a frame inner layer and a frame outer layer, and the frame inner layer and the frame outer layer are made of different materials; the thickness of the inner frame layer is greater than or equal to that of the outer frame layer; the mechanical strength of the outer layer of the frame is greater than that of the inner layer of the frame;

the contact surface of the middle plate and the inner layer of the frame is connected by welding, and the melting point of the inner layer material of the frame is the same as or similar to that of the middle plate material; the structural part formed by welding the middle plate and the frame is further processed by a Computer Numerical Control (CNC) machining process;

the frame inner layer and the frame outer layer are formed into an integrated structure through a pack rolling and thermal diffusion process;

and the contact surface of the middle plate and the inner layer of the frame is connected by friction stir welding, electron beam welding, plasma welding or laser welding.

9. The mobile terminal of claim 8,

10. The mobile terminal of claim 8, wherein the frame is a frame formed by at least one frame member connected to the midplane by a weld.

11. The mobile terminal according to any of claims 8-10, wherein the frame is a ring-shaped frame formed by stamping.

12. The mobile terminal according to any one of claims 8 to 10, wherein an absolute value of a difference between the melting point of the frame inner layer material and the melting point of the midplane material is less than a preset threshold, or a ratio of the melting point of the frame inner layer material to the melting point of the midplane material is within a preset range, or there is a same subset melting point interval between the melting point of the frame inner layer material and the melting point of the midplane material.

13. The mobile terminal according to any of claims 8-10, wherein the middle plate is a plate, a solid profile, a heterogeneous profile, or a hollow profile.