Composite support member and method of manufacturing the same, folding terminal

Abstract

The application provides a composite support component, a preparation method thereof and a folding terminal. The composite support component comprises a support part and a bendable part, the support part and the bendable part are fixedly connected along a direction perpendicular to the thickness direction of the support part, the bendable part can be bent, the bendable part is made of a first metal material, the support part is made of a second metal material, the density of the first metal material is greater than that of the second metal material, the elastic modulus of the first metal material is greater than that of the second metal material, and the strength of the first metal material is greater than that of the second metal material, so that the weight is reduced and the reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, and particularly relates to a composite support component, a preparation method thereof and a folding terminal. BACKGROUND

[0002] Nowadays, folding terminals with flexible screens are favored by more and more users. A support component is usually arranged below the flexible screen to maintain the flatness and rigidity of the flexible screen. The existing support components are usually made of metal materials (such as stainless steel or copper alloy) with low cost and high strength. However, the density of the metal materials is relatively large, so that the weight of the folding terminal is relatively heavy. Another support component is made of lightweight metal materials (such as titanium alloy). However, the cost of the metal materials is relatively high, and the rigidity and strength of the metal materials are not high. After being bent for multiple times, the support component is prone to breakage, which affects the reliability. SUMMARY

[0003] The present application provides a composite support component, a preparation method thereof and a folding terminal, which can reduce the weight, cost and improve the reliability.

[0004] In a first aspect, the present application provides a composite support component, comprising a support part and a bendable part, the support part and the bendable part are fixedly connected along a direction perpendicular to the thickness direction of the support part, the bendable part can be bent to rotate relative to the support part, the bendable part is made of a first metal material, the support part is made of a second metal material, the density of the first metal material is greater than the density of the second metal material, the elastic modulus of the first metal material is greater than the elastic modulus of the second metal material, and the strength of the first metal material is greater than the strength of the second metal material.

[0005] The support part and the bendable part are fixedly connected along a direction perpendicular to the thickness direction of the support part, that is, the support part and the bendable part are fixedly connected along the extension direction of the flexible screen. When the composite support component supports the flexible screen, the composite support component and the flexible screen are stacked, and the thickness direction of the support part is the stacking direction of the composite support component and the flexible screen.

[0006] The support part and the bendable part in the composite support component provided by the present application are made of metal materials with different properties. Since the density of the first metal material used to make the bendable part is greater than the density of the second metal material used to make the support part, the weight of the support part is relatively light, which is beneficial to reduce the weight of the composite support component. The elastic modulus of the first metal material used to make the bendable part is greater than the elastic modulus of the second metal material used to make the support part, so that the bendable part has high strength and elastic deformation capacity, thereby the bendable part can withstand multiple bending, improve the reliability of the bendable part, and prolong the service life of the composite support component.

[0007] In a first possible implementation manner of the first aspect of the first aspect of the present application, the bendable part comprises a first surface, a second surface and a rolling composite surface, the first surface and the second surface are oppositely arranged along a thickness direction of the bendable part, the rolling composite surface is connected between the first surface and the second surface, the support part comprises a rolling combination surface matched with the rolling composite surface, the rolling combination surface is combined with the rolling composite surface, and the rolling composite surface comprises at least one of a plane and a curved surface. The bendable part and the support part are prepared by a rolling process. Since the first metal material and the second metal material are plastically deformed during rolling, the support part and the bendable part are inlaid and combined at the rolling composite surface, the combination between the support part and the bendable part is strengthened, and the connection strength and stability between the support part and the bendable part are improved. Rolling refers to a pressure processing method in which a metal blank passes through the gap (various shapes) between a pair of rotating rollers, and the cross section of the material is reduced and the length is increased due to the compression of the rollers.

[0008] When the composite support part and the flexible screen are stacked, the second surface is the side of the composite support part close to the flexible screen.

[0009] In a second possible implementation manner of the first aspect or the first possible implementation manner of the first aspect, the rolling composite surface comprises a stepped surface, the rolling composite surface comprises a first connecting surface, a second connecting surface and a third connecting surface, the first connecting surface is connected between the first surface and the second connecting surface, the third connecting surface is connected between the second connecting surface and the second surface, and the rolling combination surface is fixedly connected with the first connecting surface, the second connecting surface and the third connecting surface. The rolling composite surface is a stepped surface, which increases the contact area between the support part and the bendable part and improves the combination strength between the support part and the bendable part.

[0010] In a third possible implementation manner of the first aspect or the first to second possible implementation manners of the first aspect, the rolling composite surface comprises an L-shaped surface formed by a first connecting surface and a second connecting surface, the first connecting surface is connected between the second surface and the second connecting surface, the rolling combination surface is fixedly connected with the first connecting surface and the second connecting surface, and the support part extends along the second connecting surface. The rolling composite surface is an L-shaped surface, which increases the contact area between the support part and the bendable part and improves the combination strength between the support part and the bendable part.

[0011] In a fourth possible implementation manner of the first aspect or the first to third possible implementation manners of the first aspect, the first metal material is stainless steel, and the second metal material is one of an aluminum alloy, a titanium alloy, a copper alloy, and a magnesium alloy. The stainless steel with relatively high strength and elastic modulus is selected for the bendable part, so that the cost is reduced.

[0012] In a fifth possible implementation manner of the first aspect or the first to fourth possible implementation manners of the first aspect, the first metal material is a titanium alloy, and the second metal material is one of an aluminum alloy and a magnesium alloy.

[0013] In a sixth possible implementation manner of the first aspect or the first to fifth possible implementation manners of the first aspect, the first metal material is a copper alloy, and the second metal material is one of an aluminum alloy, a magnesium alloy, and a titanium alloy.

[0014] In a seventh possible implementation manner of the first aspect or the first to sixth possible implementation manners of the first aspect, the bendable part is provided with a plurality of openings, so as to increase the elastic deformation capacity of the bendable part.

[0015] In an eighth possible implementation manner of the first aspect or the first to seventh possible implementation manners of the first aspect, the number of the support parts is at least two, and the number of the bendable parts is at least one, and each bendable part is connected between two support parts.

[0016] In a second aspect, the embodiments of the present application provide a folding terminal, which comprises a flexible screen and the composite support part as described above, and the flexible screen is fixed on the support part. The folding terminal supports the flexible screen through the composite support part, so as to reduce the weight of the folding terminal and increase the strength of the support part.

[0017] In a third aspect, the embodiments of the present application provide a preparation method of a composite support part, which comprises the following steps: providing a first plate made of a first metal material and a second plate made of a second metal material, the density of the first metal material is greater than the density of the second metal material, the elastic modulus of the first metal material is greater than the elastic modulus of the second metal material, the strength of the first metal material is greater than the strength of the second metal material, and the thickness direction of the first plate is a first direction; and performing composite processing on the first plate and the second plate to form a composite support part, the composite support part comprises a bendable part formed by the first plate and a support part formed by the second plate, the support part and the bendable part are distributed along a second direction perpendicular to the first direction, and the bendable part is bendable.

[0018] In a first possible implementation manner of the third aspect of the third aspect, the first plate material and the second plate material are subjected to rolling to form a preformed composite plate, wherein two rollers for rolling the first plate material and the second plate material are arranged at intervals along a first direction to form a gap, and the gap is used to arrange and distribute the first plate material and the second plate material along the second direction; and the preformed composite plate is subjected to processing to form the composite support component.

[0019] In a second possible implementation manner of the third aspect of the third aspect, the first plate material and the second plate material are subjected to rolling to form a composite support component, including: subjecting the first plate material and the second plate material to cold rolling for at least one pass to form a preformed composite plate.

[0020] In a third possible implementation manner of the third aspect of the third aspect, before the first plate material and the second plate material are subjected to cold rolling for at least one pass, the first plate material and the second plate material are subjected to rolling to form a composite support component, further including: heating the first plate material to a preset temperature; and subjecting the first plate material and the second plate material subjected to the heating treatment to rolling. Since heating is performed before rolling, the required rolling force is relatively small, which is conducive to processing and forming, and the bonding force after rolling is better.

[0021] In a fourth possible implementation manner of the third aspect of the third aspect, the preformed composite plate is subjected to processing to form a composite support component, including: processing a plurality of openings on a preformed bendable portion of the preformed composite plate to form the bendable portion, thereby obtaining the composite support component.

[0022] In a fifth possible implementation manner of the third aspect of the third aspect, the first plate material has a to-be-combined surface, the second plate material has a to-be-combined surface, the to-be-combined surface of the first plate material includes at least one of a flat surface and a curved surface, and the to-be-combined surface of the second plate material matches the to-be-combined surface of the first plate material, facilitating the joint between the first plate material and the second plate material.

[0023] In a sixth possible implementation manner of the third aspect of the third aspect, before the first plate material and the second plate material are fixedly connected to form a preformed composite plate, the preparation method further includes: arranging the first plate material and the second plate material along a direction perpendicular to the thickness direction of the first plate material, and the to-be-combined surface of the first plate material is in close contact with the to-be-combined surface of the second plate material, facilitating rolling.

[0024] In a seventh possible implementation manner of the third aspect or the first to sixth possible implementation manners of the third aspect of the present application, the first plate further includes a first surface and a second surface arranged oppositely along the thickness direction of the first plate, the surface to be combined of the first plate is a stepped surface, the stepped surface includes a first connecting surface, a second connecting surface and a third connecting surface, the first surface and the second surface are arranged oppositely along the thickness direction of the first plate, the first connecting surface is connected between the first surface and the second connecting surface, and the third connecting surface is connected between the second connecting surface and the second surface, and the arranging the first plate and the second plate along the direction perpendicular to the thickness direction of the first plate includes that the surface to be combined of the second plate is in close contact with the first connecting surface, the second connecting surface and the third connecting surface. The contact surface of the first plate and the second plate is increased, and the bonding strength of the first plate and the second plate is improved.

[0025] In an eighth possible implementation manner of the third aspect or the first to seventh possible implementation manners of the third aspect of the present application, the first plate further includes a first surface and a second surface arranged oppositely along the thickness direction of the first plate, the surface to be combined of the first plate is a stepped surface, the stepped surface includes a first connecting surface, a second connecting surface and a third connecting surface, the first surface and the second surface are arranged oppositely along the thickness direction of the first plate, the first connecting surface is connected between the first surface and the second connecting surface, and the third connecting surface is connected between the second connecting surface and the second surface, and the arranging the first plate and the second plate along the direction perpendicular to the thickness direction of the first plate includes that the surface to be combined of the second plate is in close contact with the second connecting surface and the third connecting surface, and the second plate extends along the second connecting surface. The contact surface of the first plate and the second plate is increased, and the bonding strength of the first plate and the second plate is improved.

[0026] In a ninth possible implementation manner of the third aspect or the first to eighth possible implementation manners of the third aspect of the present application, the processing and treating the prefabricated composite plate to form a composite support component includes: performing slice cutting on the prefabricated composite plate to form a prefabricated composite support component with a preset size, the prefabricated composite support component including a prefabricated bendable part made of the first metal material and a support part made of the second metal material; performing straightening and flattening treatment on the prefabricated composite support component to improve flatness; and processing a plurality of openings on a preset region of the prefabricated bendable part to form the bendable part, thereby obtaining the composite support component.

[0027] According to the third aspect or the first to ninth possible implementations of the third aspect of this application, in the tenth possible implementation of the third aspect of this application, before arranging the first plate and the second plate along a direction perpendicular to the thickness direction of the first plate, the preparation method further includes roughening the surface of the first plate to be laminated and roughening the surface of the second plate to be laminated. By roughening the surfaces of the first plate and the second plate to be laminated, the interlocking force during rolling is improved. Attached Figure Description

[0028] Figure 1 A structural block diagram of a folding terminal provided in an embodiment of this application;

[0029] Figure 2 A cross-sectional view of a portion of the structure of a folding terminal provided in an embodiment of this application;

[0030] Figure 3 A plan view of the composite support component of the folding terminal provided in the embodiments of this application;

[0031] Figures 4-8 A cross-sectional view of a possible structure of the composite support component (or the first plate and the second plate) provided in an embodiment of this application;

[0032] Figure 9a A flowchart illustrating the method for preparing the composite support component provided in this application embodiment;

[0033] Figure 9b for Figure 9a A schematic diagram of the rolling process in step 903 is shown;

[0034] Figure 10 A flowchart illustrating the method for preparing the composite support component provided in the first embodiment of this application;

[0035] Figure 11 for Figure 10 The flowchart illustrating step S107;

[0036] Figure 12 for Figure 11 The flowchart illustrating step S201;

[0037] Figure 13 for Figure 11 The flowchart illustrating step S203;

[0038] Figure 14 for Figure 13 A schematic diagram of the prefabricated composite component obtained in step S1091 is shown. Detailed Implementation

[0039] For the purpose of the present application, the technical solutions and advantages, the present application will be described in further detail below with reference to the accompanying drawings.

[0040] It should be understood that expressions such as "include" and "may include" used in the present application indicate the presence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In the present application, terms such as "include" and / or "have" can be interpreted to mean that a certain characteristic, number, operation, constituent element, component or a combination thereof is present, but cannot be interpreted to mean that the presence or addition of one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof is excluded.

[0041] In addition, in the present application, the expression "and / or" includes any and all combinations of the associated listed terms. For example, the expression "A and / or B" can include A, can include B, or can include both A and B.

[0042] In the present application, expressions including ordinal numbers such as "first" and "second" can modify elements. However, such elements are not limited by the above expressions. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are merely used to distinguish one element from other elements. For example, a first user device and a second user device indicate different user devices, although the first user device and the second user device are both user devices. Similarly, a first element can be referred to as a second element, and likewise, a second element can be referred to as a first element, without departing from the scope of the present application.

[0043] When a component is referred to as being "connected" or "accessed" to other components, it should be understood that the component can be directly connected or accessed to the other components, and another component can be present between the component and the other components. On the other hand, when a component is referred to as being "directly connected" or "directly accessed" to other components, it should be understood that there is no component between them.

[0044] Embodiments of the present application provide a foldable terminal, wherein the provided foldable terminal can be a wearable device, an AR (augmented reality) \ VR (virtual reality) device, a tablet, a notebook, a UMPC (ultra-mobile personal computer), a netbook, a PDA (personal digital assistant), etc., and embodiments of the present application do not limit this.

[0045] As Figure 1As shown, in some embodiments of this application, the provided foldable terminal can be a mobile phone. The structure of the foldable terminal 100 will be described below using a mobile phone as an example.

[0046] like Figure 1 As shown, the foldable terminal 100 may specifically include: a processor 101, a radio frequency (RF) circuit 102, a memory 103, a flexible screen 104, a Bluetooth device 105, one or more sensors 106, a Wi-Fi device 107, a positioning device 108, an audio circuit 109, a peripheral interface 110, and a power supply 111, etc. These components can be connected via one or more communication buses or signal lines. Figure 1 (Not shown in the image) communicates. Those skilled in the art will understand that... Figure 1 The hardware structure shown does not constitute a limitation on the foldable terminal 100. The foldable terminal 100 may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0047] The following is combined Figure 1 A detailed introduction to each component of the folding terminal 100:

[0048] The processor 101 is the control center of the foldable terminal 100. It connects various parts of the foldable terminal 100 through various interfaces and lines. By running or executing applications (referred to as Apps) stored in the memory 103 and calling data stored in the memory 103, it performs various functions of the foldable terminal 100 and processes data. In some embodiments, the processor 101 may include one or more processing units.

[0049] The radio frequency (RF) circuit 102 can be used to receive and transmit wireless signals during information transmission or calls. Specifically, the RF circuit 102 can receive downlink data from the base station and then process it for the processor 101. Additionally, it can transmit uplink data to the base station. Typically, the RF circuit includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc. Furthermore, the RF circuit 102 can also communicate with other devices wirelessly. The wireless communication can use any communication standard or protocol, including but not limited to Global System for Mobile Communications (GSMO), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WDMA), Long Term Evolution (LTE), email, Short Message Service (SMS), etc.

[0050] The memory 103 is used to store applications and data, and the processor 101 executes various functions of the folding terminal 100 and data processing by running the applications and data stored in the memory 103. The memory 103 mainly includes a storage program area and a storage data area, wherein the storage program area can store an operating system and at least one application required by a function (such as a sound playing function, an image playing function, etc.). The storage data area can store data created according to the use of the folding terminal 100 (such as audio data, a phone book, etc.). In addition, the memory 103 can include a high-speed random access memory and can also include a non-volatile memory such as a disk storage device, a flash memory device, or other volatile solid-state storage devices. The memory 103 can store various operating systems, such as an iOS operating system developed by Apple Inc. and an Android operating system developed by Google Inc.

[0051] The flexible screen 104 is used to provide input and / or output functions for the user. In the embodiment, the flexible screen 104 includes a flexible cover plate (not shown in the figure), a flexible touch screen (not shown in the figure), and a flexible display screen (not shown in the figure) arranged in layers, which are used to display information and provide touch input for the user. It can be understood that the flexible screen 104 can also include one of the flexible touch screen and the flexible display screen, or the flexible screen 104 is a flexible screen integrating touch and display functions, etc., which are not limited herein.

[0052] The folding terminal 100 can also include a Bluetooth device 105, which is used to realize data exchange between the folding terminal 100 and other short-distance terminals (such as folding terminals, smart watches, etc.). The Bluetooth device 105 in the embodiment of the application can be an integrated circuit or a Bluetooth chip, etc.

[0053] The folding terminal 100 can also include at least one sensor 106, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor can include an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the flexible screen 104 according to the brightness of the ambient light, and the proximity sensor can turn off the power of the flexible screen 104 when the folding terminal 100 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the size of acceleration in each direction (generally three axes), and when at rest, it can detect the size and direction of gravity, which can be used for applications of identifying the posture of the folding terminal (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as a pedometer, a knock), etc. As for other sensors that can be configured on the folding terminal 100, such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., they are not described herein.

[0054] Wi-Fi device 107, configured to provide the folding terminal 100 with network access in compliance with Wi-Fi related standard protocols. The folding terminal 100 can access a Wi-Fi access point through the Wi-Fi device 107, and in turn help the user to send and receive emails, browse web pages, access streaming media, and so on, which provides the user with wireless broadband Internet access. In some other embodiments, the Wi-Fi device 107 can also serve as a Wi-Fi wireless access point, and can provide Wi-Fi network access for other terminals.

[0055] Positioning device 108, configured to provide the folding terminal 100 with geographic location. It can be understood that the positioning device 108 can be specifically a receiver of a global positioning system (GPS) or a Beidou satellite navigation system, a Russian GLONASS (global navigation satellite system), or the like. After receiving the geographic location sent by the above positioning system, the positioning device 108 sends the information to the processor 101 for processing, or to the memory 103 for storage. In some other embodiments, the positioning device 108 can also be a receiver of an assisted global positioning system (AGPS). The AGPS system assists the positioning device 108 to complete the ranging and positioning service by serving as an auxiliary server, and in this case, the auxiliary positioning server provides positioning assistance by communicating with the positioning device 108 (i.e., the GPS receiver) of the terminal such as the folding terminal 100 through a wireless communication network. In some other embodiments, the positioning device 108 can also be a Wi-Fi access point based positioning technology. Since each Wi-Fi access point has a globally unique MAC address, the terminal can scan and collect the broadcast signals of the surrounding Wi-Fi access points when the Wi-Fi is turned on, and thus can obtain the MAC address broadcasted by the Wi-Fi access point. The terminal sends the data (such as the MAC address) capable of indicating the Wi-Fi access point to a location server through a wireless communication network, and the location server retrieves the geographic location of each Wi-Fi access point, and calculates the geographic location of the terminal in combination with the strength of the Wi-Fi broadcast signal, and sends it to the positioning device 108 of the terminal.

[0056] The audio circuit 109, the speaker 113, and the microphone 114 can provide an audio interface between the user and the folding terminal 100. The audio circuit 109 can convert received audio data into an electrical signal and transmit the electrical signal to the speaker 113, which converts the electrical signal into a sound signal and outputs the sound signal. On the other hand, the microphone 114 converts a sound signal collected by the microphone 114 into an electrical signal, and the audio circuit 109 receives the electrical signal and converts the electrical signal into audio data. The audio data is output to the RF circuit 102 to be transmitted to another folding terminal, for example, or to the memory 103 for further processing.

[0057] The peripheral interface 110 can provide various interfaces for external input / output devices (e.g., a keyboard, a mouse, an external display, an external memory, a subscriber identification module card, etc.). For example, the peripheral interface 110 can be connected to a mouse through a universal serial bus (USB) interface and to a subscriber identification module (SIM) card provided by a telecommunication carrier through metal contacts on a SIM card slot. The peripheral interface 110 can be used to couple the above-described external input / output peripheral devices to the processor 101 and the memory 103.

[0058] The folding terminal 100 can further include a power supply device 111 (e.g., a battery and a power management chip) that supplies power to each component. The battery can be logically connected to the processor 101 through the power management chip, and the power supply device 111 can perform functions such as management of charging, discharging, and power consumption.

[0059] Although Figure 1 The folding terminal 100 can further include a camera (a front camera and / or a rear camera), a flash, a micro projection device, a near field communication (NFC) device, etc., which are not shown.

[0060] Generally, stainless steel is mainly used as a material for a support member that supports a flexible screen. However, stainless steel has a high density, and thus a composite support member made of stainless steel has a high weight. If a titanium alloy having a low density is used as a material for a support member, the cost of a folding terminal is increased. In addition, the strength of a titanium alloy is lower than that of stainless steel, but the cost of a titanium alloy is much higher than that of stainless steel. Also, the rigidity and strength of a titanium alloy are lower than those of stainless steel, and thus the risk of bending reliability is higher than that of stainless steel.

[0061] Based on this, please refer to Figure 2 , Figure 2As shown in the side view of the partial structure of the folding terminal provided in the embodiments of the present application, the folding terminal 100 further comprises a composite support component 30 carrying the flexible screen 104, the composite support component 30 comprising a support portion 33 and a bendable portion 35 fixedly connected along the thickness direction of the vertical support portion 33. The bendable portion 35 is made of a first metal material, and the support portion 33 is made of a second metal material. The density of the first metal material is greater than that of the second metal material, the elastic modulus of the first metal material is greater than that of the second metal material, and the strength of the first metal material is greater than that of the second metal material. The support portion 33 and the bendable portion 35 are fixedly connected with the flexible screen 104 through an adhesive layer 40. It can be understood that in some embodiments, the bendable portion 35 can not be fixedly connected with the flexible screen 104.

[0062] In the composite support component 30 provided in the embodiments of the present application, the support portion 33 and the bendable portion 35 are made of metal materials with different properties. Since the density of the first metal material making the bendable portion 35 is greater than that of the second metal material making the support portion 33, the weight of the support portion 33 is lighter, which is beneficial to reducing the weight of the composite support component 30 and the folding terminal 100. Since the elastic modulus of the first metal material making the bendable portion 35 is greater than that of the second metal material making the support portion 33, and the strength of the first metal material is greater than that of the second metal material, the bendable portion 35 capable of being bent has higher strength and elastic deformation capacity, so that the bendable portion 35 can withstand multiple bending, improve the reliability of the bendable portion 35, and prolong the service life of the composite support component 30.

[0063] In the embodiments, the first metal material making the bendable portion 35 is stainless steel, and the second metal material making the support portion 33 is aluminum alloy, for example, the aluminum alloy includes but is not limited to one of 5052, 5182, 5082, 5083 in the 5 series aluminum alloy, and the stainless steel includes but is not limited to one of SUS304, SUS301, SUS316 stainless steel. Taking the first metal material as SUS316 stainless steel and the second metal material as 5052 aluminum alloy as an example, the density of SUS316 stainless steel is 7.90 g / cm 3 , the elastic modulus of SUS316 stainless steel is 193 GPa, the material density of 5052 aluminum alloy is 2.72 g / cm 3 , and the elastic modulus of 5052 aluminum alloy is 69.3-70.7 GPa.

[0064] It can be understood that the first metal material for manufacturing the bendable part 35 is stainless steel, and the second metal material for manufacturing the support part 33 is one of aluminum alloy, titanium alloy, and copper alloy; the first metal material for manufacturing the bendable part 35 is titanium alloy, and the second metal material for manufacturing the support part 33 is one of aluminum alloy and magnesium alloy, for example, the titanium alloy can be selected as TA4 titanium alloy; the first metal material for manufacturing the bendable part 35 is copper alloy, and the second metal material for manufacturing the support part 33 is one of aluminum alloy, magnesium alloy, and titanium alloy.

[0065] The composite support part 30 includes a flat state and a bent state. The flat state refers to that the support part 33 and the bendable part 35 are located on the same plane, and the bent state refers to that the bendable part 35 is bent relative to the support part 33. In the embodiment, the number of the support part 33 is two, and the number of the bendable part 35 is one. It is assumed that the thickness direction of the support part 33 is the first direction (for example, the Z direction shown in FIG. 1), and when the folding terminal 100 is in the flat state (for example, as shown in FIG. 1), the bendable part 35 is connected between the two support parts 33, and the bendable part 35 and the support part 33 are located on a plane perpendicular to the first direction. Figure 2 Figure 2 As shown in FIG. 1, when the folding terminal 100 is in the bent state (for example, as shown in FIG. 2), the bendable part 35 is bent relative to the support part 33, and the bendable part 35 and the support part 33 are located on a plane parallel to the first direction. Figure 3 As shown in FIG. 1, when the folding terminal 100 is in the bent state (for example, as shown in FIG. 2), the bendable part 35 is bent relative to the support part 33, and the bendable part 35 and the support part 33 are located on a plane parallel to the first direction.

[0066] It can be understood that the number of the support part 33 is not limited, and the number of the bendable part 35 is not limited, for example, the number of the support part 33 can be one, and the number of the bendable part 35 can be one; the second metal materials for manufacturing the two or more support parts 33 can also be different, for example, the second metal material for manufacturing one support part 33 is titanium alloy, and the second metal materials for manufacturing the remaining support parts 33 are magnesium alloy.

[0067] In the embodiment, the bendable part 35 and the support part 33 of the composite support part 30 are prepared by a rolling process. Please refer to FIG. 3. Figure 4 The bendable part 35 includes a first surface 352, a second surface 353, and a rolling composite surface 301. The support part 33 includes a rolling combination surface 331 which is matched with and fixedly connected to the rolling composite surface 301. In other words, the rolling composite surface 301 is matched with the rolling combination surface 331. Since the rolling composite surface 301 is matched with the rolling combination surface 331, the rolling composite surface 301 is taken as an example for a simple description below.

[0068] ​The rolling composite surface 301 comprises a first rolling composite surface 3011 and a second rolling composite surface 3013, wherein the first surface 352 is arranged on the side of the composite support component 30 away from the flexible screen 104, and the second surface 353 is arranged on the side of the composite support component 30 close to the flexible screen 104. The first surface 352 and the second surface 353 are oppositely arranged along the first direction, the first rolling composite surface 3011 is connected between the first surface 352 and the second surface 353, and the second rolling composite surface 3013 is connected between the first surface 352 and the second surface 353. The rolling joint surface 331 of one support part 33 and the bendable part 35 are inlaid and combined together through the first rolling composite surface 3011, and the rolling joint surface 331 of the other support part 33 and the bendable part 35 are inlaid together through the second rolling composite surface 3013. For example, the weight of the composite support component made of aluminum alloy / stainless steel / aluminum alloy is 11.18 g, and the weight of the support component made of titanium alloy alone is 13.08 g, and the weight of the support component made of stainless steel alone is about 23.48 g under the condition of the same size (the same length, width and thickness) as the composite support component 30.

[0069] The bendable part 35 is combined and fixed with the rolling joint surface 331 of the support part 33 through the rolling composite surface 301, and the rolling composite surface 301 of the bendable part 35 and the rolling joint surface 331 of the support part 33 are inlaid and combined together due to the plastic deformation of the first metal material and the second metal material during rolling, so that the combination between the support part 33 and the bendable part 35 is stronger, which is beneficial to improving the connection strength and stability between the support part 33 and the bendable part 35. The rolling refers to a pressure processing method in which a metal blank is passed through the gap (various shapes) of a pair of rotating rollers, so that the cross section of the material is reduced and the length is increased due to the compression of the rollers.

[0070] In the embodiment, the first rolling composite surface 3011 and the second rolling composite surface 3013 can be vertical surfaces perpendicular to the first surface 352, that is, the cross section of the bendable part 35 is substantially rectangular, which is convenient for the preparation of the composite support component 30.

[0071] The shape and structure of the support part 33 and the bendable part 35 are not limited, for example, referring to Figure 5 The cross section of the bendable part 35 is substantially trapezoidal, the first rolling composite surface 3011 and the second rolling composite surface 3013 can be inclined surfaces arranged obliquely to the first surface 352, the included angle between the first rolling composite surface 3011 and the first surface 352 is obtuse, and the included angle between the second rolling composite surface 3013 and the first surface 352 is obtuse; for example, referring to Figure 6The cross section of the bendable part 35 is approximately parallelogram, the first rolling composite surface 3011 and the second rolling composite surface 3013 can be inclined surfaces arranged obliquely to the first surface 352, the included angle between the first rolling composite surface 3011 and the first surface 352 is obtuse, and the included angle between the first rolling composite surface 3011 and the first surface 352 is acute; for example, please refer to Figure 7 The first rolling composite surface 3011 and the second rolling composite surface 3013 each include a stepped surface formed by a first connecting surface 3015, a second connecting surface 3016 and a third connecting surface 3017, the first connecting surface 3015 is connected between the first surface 352 and the second connecting surface 3016, the third connecting surface 3017 is connected between the second connecting surface 3016 and the second surface 353, and the rolling bonding surface 331 of the support part 33 is fixedly connected with the first connecting surface 3015, the second connecting surface 3016 and the third connecting surface 3017; for example, please refer to Figure 8 The first rolling composite surface 3011 and the second rolling composite surface 3013 each include an L-shaped surface formed by the first connecting surface 3015 and the second connecting surface 3016, the first connecting surface 3015 is connected between the second surface 353 and the second connecting surface 3016, and the rolling bonding surface 331 is fixedly connected with the first connecting surface 3015 and the second connecting surface 3016, and the support part 33 extends along the second connecting surface 3016, that is, the support part 331 is overlapped on the bendable part 33.

[0072] As Figures 5-8 The first rolling composite surface 3011 shown in the above is a plane which is not perpendicular to the first surface 352, which increases the contact area of the bendable part 35 and the support part 33, and is beneficial to improve the bonding strength between the bendable part 35 and the support part 33.

[0073] It can be understood that the cross-sectional shapes of the first rolling composite surface 3011 and the second rolling composite surface 3013 can be the same or different; the structure shape of the first rolling composite surface 3011 is not limited, for example, the first rolling composite surface 3011 can also be jagged, curved, etc.; the structure shape of the second rolling composite surface 3013 is not limited, for example, the first rolling composite surface 3011 can also be jagged, curved, etc. The rolling composite surface 301 can be a plane perpendicular to the first surface, the rolling composite surface 301 of the rolling composite surface 301 can be an inclined surface obliquely to the first surface, the rolling composite surface 301 can also be a curved surface, a special-shaped surface, a stepped surface, etc., the rolling composite surface 301 includes at least one of a plane and a curved surface, and the rolling bonding surface 331 is consistent with the rolling composite surface 301.

[0074] In the preparation of the composite support component 30, the first plate made of the first metal material and the second plate made of the second metal material are arranged along the direction perpendicular to the thickness direction of the first plate, and the first plate and the second plate are rolled together. The rolled plate is sequentially subjected to slicing, rough trimming, fine trimming, film coating / oil printing, exposure, development, etching, and then demolding cleaning to obtain the composite support component 30.

[0075] It can be understood that the composite support component 30 is not limited to being prepared by rolling process, and the bendable part 35 and the support part 33 can be fixedly connected by other means, such as adhesive bonding, welding, etc.

[0076] More specifically, please refer to Figure 9a The embodiment of the present application also provides a preparation method of a composite support component, comprising the following steps:

[0077] Step S901, providing a first plate made of a first metal material and a second plate made of a second metal material. The first plate is used to form a bendable part, and the second plate is used to form a support part. The first metal material is different from the second metal material, the density of the first metal material is greater than the density of the second metal material, the elastic modulus of the first metal material is greater than the elastic modulus of the second metal material, the strength of the first metal material is greater than the strength of the second metal material, and the thickness direction of the first plate is the first direction.

[0078] For example, the first plate can be made of stainless steel plate, and the second plate can be made of aluminum alloy plate. It can be understood that the stainless steel plate includes but is not limited to SUS304, SUS301, SUS316 stainless steel, and the material state is O, 1 / 2H, 3 / 4H, and the thickness range is 0.12mm-0.50mm; the aluminum alloy plate includes but is not limited to 5052, 5182, 5082, 5083 aluminum alloy, and the material state can be O, H11, H12, H14, and the thickness is 0.15-1.0mm. O state refers to annealing state, i.e. full soft state, which is the lowest strength state obtained after complete annealing of the material. H state refers to complete work hardening state. Taking SUS301 as an example, the hardness of H state is ≥430HV (HV is Vickers hardness), the hardness of 1 / 2H is ≥210HV, and the hardness of 3 / 4H is ≥370HV.

[0079] Step S903, composite processing the first plate and the second plate to form a composite support component, the composite support component comprising a bendable part formed by the first plate and a support part formed by the second plate, the support part and the bendable part being distributed along a second direction perpendicular to the first direction, and the bendable part being bendable.

[0080] In this embodiment, the first plate and the second plate are rolled together to form a composite support component. For example, Figure 9b The two rolls 501 that roll the first plate 401 and the second plate 403 along a first direction (e.g.) Figure 9b The gap 503 is formed by spacing along the Z direction (as shown in the diagram), and the gap 503 is used to pass through the second direction (e.g., Figure 9b The first plate 401 and the second plate 403 are arranged in the X direction (as shown in the diagram), and two rolls 501 roll the first plate 401 and the second plate 403. The shortest line connecting the axes O of the two rolls 501 is parallel to the first direction.

[0081] There are two rolling methods: the first is differential temperature rolling and cold rolling, and the second is multi-pass cold rolling. Differential temperature rolling refers to rolling at different temperatures depending on the metal material. For example, stainless steel is heated to 300-500℃, while aluminum alloys are not heated, and the two are rolled together.

[0082] When using the first rolling method (differential temperature rolling and cold rolling), a prefabricated composite plate is formed by rolling a first plate and a second plate together. This includes: heating the first plate to a preset temperature; rolling the heated first and second plates together; and cold rolling the rolled plates together to form the prefabricated composite plate. For example, induction heating can be used to heat the first plate, with a preset temperature range of 300-500℃. The first plate transfers heat to the second plate through heat transfer. The reduction per rolling pass can range from 10% to 60%, the reduction per cold rolling pass can range from 2% to 20%, and the rolling speed can range from 50 to 3000 mm / s. The reduction refers to the percentage change in thickness of the plate after rolling compared to its total thickness before rolling. In the first rolling method, heating is involved, requiring relatively less rolling force, which is beneficial for forming and results in better bonding after rolling.

[0083] Heating the metal or alloy to a suitable temperature and holding it therein causes recrystallization and crystal growth, resulting in a structure free of internal stress and work hardening. This crystallization process, which occurs without phase transformation within the solid metal or alloy—a process that softens work-hardened metals and alloys without phase transformation—is called recrystallization. Cold rolling refers to the rolling process performed at temperatures below the recrystallization temperature.

[0084] It is understood that there are no restrictions on the heating method or heating location. For example, the first plate and the second plate can be heated simultaneously. There are no restrictions on the amount of reduction in the rolling passes after heating, the amount of reduction in the cold rolling passes, the rolling speed, or the type of rolling.

[0085] In the second rolling method (at least two cold rolling), the first plate and the second plate are arranged and then cold rolled for at least two times to form a preformed composite plate. For example, the first cold rolling is performed at a reduction of 10% to 70%, and then the second cold rolling is performed at a reduction of 2% to 20% at a rolling speed of 50 to 3000 mm / s. It can be understood that the reduction and the rolling speed are not limited. In the second rolling method, the process is simpler because no heating is required during rolling.

[0086] It can be understood that the first plate and the second plate are not limited to be fixedly connected by rolling, and the first plate and the second plate can be fixedly connected by gluing, welding, riveting, etc.

[0087] The preparation method of the composite support component is further described below with respect to five embodiments.

[0088] First embodiment

[0089] The preparation method provided by the first embodiment of the present application is described below with reference to Figure 10 , and specifically includes the following steps:

[0090] In step S101, a first plate made of a first metal material and a second plate made of a second metal material are provided. The first plate has a to-be-combined surface, and the second plate has a to-be-combined surface. The to-be-combined surface of the first plate and the to-be-combined surface of the second plate are used to form a rolling combined surface after rolling. The first plate is used to form a bendable part, and the second plate is used to form a support part. The first metal material is different from the second metal material. The density of the first metal material is greater than the density of the second metal material. The elastic modulus of the first metal material is greater than the elastic modulus of the second metal material. The strength of the first metal material is greater than the strength of the second metal material. In the embodiment, the number of the first plate is one, and the number of the second plate is two. The to-be-combined surface of the first plate is matched with the to-be-combined surface of the second plate.

[0091] The first plate is made of a 0.4 mm thick O-state SUS304 stainless steel plate, and the second plate is made of a 0.4 mm thick 5182-H11 aluminum alloy plate. The cross section of the first plate is approximately square.

[0092] Step S103, roughening the surface to be compounded of the first plate and roughening the surface to be compounded of the second plate. The surface to be compounded of the first plate and the surface to be compounded of the second plate are roughened to enhance the rolling bonding force (also referred to as the bite force). The roughening can be performed by a mechanical method or a chemical method. For example, the surface to be compounded can be polished by a grinding wheel, sandpaper, sandblasting, wire drawing, etc. For example, the surface to be compounded can be processed into a sawtooth shape to enhance the rolling bite force. For the chemical method, the surface to be compounded of the first plate and the surface to be compounded of the second plate are respectively immersed in a suitable chemical reagent, for example, the first plate is immersed in an HCL solution and the second plate is immersed in a 10% NaOH solution. The surface to be compounded of the first plate after roughening is cleaned, and the surface to be compounded of the second plate after roughening is cleaned.

[0093] Step S105, arranging the first plate and the second plate along a direction perpendicular to the thickness direction of the first plate, the surface to be compounded of the first plate and the surface to be compounded of the second plate being in close contact, and the first plate being located between two second plates.

[0094] Step S107, performing a composite processing on the first plate and the second plate to form a composite support component. The composite support component includes a bendable part formed by the first plate and a support part formed by the second plate, the support part and the bendable part being distributed along a second direction perpendicular to the first direction, and the bendable part being capable of being bent. Step S107, performing a composite processing on the first plate and the second plate to form a composite support component, please refer to Figure 11 , specifically including the following steps:

[0095] Step S201, rolling the first plate and the second plate to form a preformed composite plate. The two rollers for rolling the first plate and the second plate are arranged at intervals along the first direction to form a gap, and the gap is used to pass through the first plate and the second plate arranged and distributed along the second direction.

[0096] Step S203, processing the preformed composite plate to form a composite support component. Step S201, please refer to Figure 12 , specifically including the following steps:

[0097] Step S1071, heating the first plate to a preset temperature. In the first embodiment, the preset temperature can be in the range of 300-500℃, and the first plate transmits heat to the second plate through heat transfer.

[0098] Step S1073, rolling the first plate and the second plate, and the rolling reduction is 50%.

[0099] Step S1075, the first plate and the second plate are cold-rolled for at least one pass to form a preformed composite plate, and the cold-rolling reduction is 10% each time, to obtain a preformed composite plate of 5182 aluminum alloy / SUS304 stainless steel / 5182 aluminum alloy with a thickness of 0.16 mm. The preformed composite plate includes a first preformed body formed by the first plate and a second preformed body formed by the second plate, and the first preformed body and the second preformed body are connected along the second direction. The number of the first preformed body is one, the number of the second preformed body is two, and the first preformed body is connected between the two first preformed bodies.

[0100] It can be understood that at least one of steps S1071 and S1075 can be omitted to simplify the rolling step.

[0101] Step S203, i.e., processing the preformed composite plate to form a composite support component, wherein the first preformed body is processed to form a bendable part, and the second preformed body is processed to form a support part. The processing includes slicing, straightening, hole processing, etc. Step 203, please refer to Figure 13 , which specifically includes the following steps:

[0102] Step S1091, slicing the preformed composite plate to form a preformed composite support component with a predetermined size (e.g., 50 shown in Figure 14 ), wherein the first preformed body of the preformed composite plate is cut to form a preformed bendable part (e.g., 55 shown in Figure 14 ), and the second preformed body of the preformed composite plate is cut to form a support part (e.g., 51 shown in Figure 14 ). The predetermined size can be a width of 140 mm along the second direction, a length of 155 mm along the third direction, the third direction being perpendicular to the second direction, and the third direction being perpendicular to the first direction.

[0103] Step S1093, straightening and flattening the preformed composite support component. The straightening and flattening includes rough straightening and flattening and fine straightening and flattening to achieve the required surface smoothness / roughness. The preformed composite support component is first subjected to rough straightening and flattening, and then subjected to fine straightening and flattening.

[0104] Step S1095, processing a plurality of holes in a predetermined area of the preformed bendable part (e.g., 55 shown in Figure 14 ) to form a bendable part, thereby obtaining a composite support component (e.g., 30 shown in Figure 3 ). The plurality of holes can be formed in the bendable area of the bendable part by etching or mechanical processing. The width of the bendable area is about 40 mm, and the width of the holes along the second direction is about 0.2 mm.

[0105] It can be understood that steps S1091 and S1093 can be omitted, and the processing of the preformed composite plate to form the composite support component after rolling includes processing a plurality of openings in the preformed bendable portion of the preformed composite plate to form the bendable portion, thereby obtaining the composite support component.

[0106] It can be understood that if the thickness of the portion made of the first metal material in the rolled plate is thin enough to be bent and reaches the predetermined size, and the flatness roughness also meets the predetermined requirements, the post-processing of the rolled plate can be omitted, i.e., step S1077 is omitted, and step S1075 includes cold rolling the first plate and the second plate for at least one pass to form the composite support component.

[0107] It can be understood that in the case where the provided first plate and the second plate are arranged in the second direction, step S105 can be omitted.

[0108] The first embodiment of the present application obtains a composite support component of 5182 aluminum alloy / SUS304 stainless steel / 5182 aluminum alloy with a thickness of 0.16 mm through the above steps. In the same size (equivalent length, width, and thickness), the composite support component obtained by the first embodiment of the present application weighs about 12.4 g, and a stainless steel material weighs about 25.1 g. That is, the composite support component prepared by the first embodiment of the present application reduces the weight of the stainless steel part by 50.4%. The composite support component prepared by the first embodiment of the present application is subjected to 200,000 times of bending test, and no cracking problem occurs, and the flatness is still good after the test.

[0109] Second embodiment

[0110] The second embodiment of the present application is similar to the steps of the preparation method provided by the first embodiment, and the difference lies in the first plate and the second plate selected in step S101, the rolling reduction in step S1073, and the number of cold rolling passes in step S1075. The specific differences from the first embodiment are described below:

[0111] In step S101, the first plate is a 0.3 mm thick SUS304 stainless steel plate in the O state, and the second plate is a 0.3 mm thick 5182-H11 aluminum alloy plate.

[0112] The cross section of the first plate is generally trapezoidal, the surface to be compounded of the first plate is an inclined surface, and the surface to be compounded of the second plate is an inclined surface that matches the surface to be compounded of the first plate. It should be noted that the first plate and the second plate are similar to the 35 structure shown in FIG. 1B. Figure 5 The cross section of the first plate is generally trapezoidal, the surface to be compounded of the first plate is an inclined surface, and the surface to be compounded of the second plate is an inclined surface that matches the surface to be compounded of the first plate. It should be noted that the first plate and the second plate are similar to the 35 structure shown in FIG. 1B. Figure 5For example, the first plate includes a first surface 352 and a second surface 353, and the first plate includes a first surface to be compounded 3011 and a second surface to be compounded 3013. The first surface 352 and the second surface 353 are oppositely arranged along the first direction, and the first surface to be compounded 3011 and the second surface to be compounded 3013 are respectively connected between the first surface 352 and the second surface 353. The included angle between the first surface to be compounded 3011 of the first plate and the first surface 352 is an acute angle of 45 degrees, and the included angle between the second surface to be compounded 3013 of the first plate and the first surface 352 is an obtuse angle of 135 degrees. In other words, the first surface to be compounded and the second surface to be compounded of the first plate are both inclined surfaces. The surface to be compounded of the second plate is an inclined surface that matches the surface to be compounded of the first plate. The included angle between the first surface to be compounded 3011, the second surface to be compounded 3013 and the first surface of the first plate is not limited, for example, please refer to Figure 6 , the included angle between the first surface to be compounded 3011 and the first surface 352 is an obtuse angle, and the included angle between the second surface to be compounded 3013 and the first surface 352 is an acute angle.

[0113] It can be understood that the shape of the cross section of the first plate is not limited, for example, the cross section of the first plate can be square, and the included angle between the two surfaces to be compounded of the first plate and the first surface is 45 degrees; the surface to be compounded of the first plate and the second plate can be a plane perpendicular to the first surface, the surface to be compounded of the first plate can be an inclined surface inclined to the first surface, and the surface to be compounded of the first plate can also be a curved surface, a special-shaped surface, a stepped surface, etc. The surface to be compounded of the first plate includes at least one of a plane and a curved surface, and the surface to be compounded of the first plate matches the surface to be compounded of the second plate.

[0114] The reduction in step S1073 is 40%.

[0115] In step S1075, the number of cold rolling passes is 4, and the reduction of each pass is 5%, so that a 5182 aluminum alloy / SUS304 stainless steel / 5182 aluminum alloy preformed composite plate with a thickness of 0.15 mm is obtained.

[0116] Under the same size, the weight of the composite support part prepared by the second embodiment of the application is about 11.4g, and the weight of the support part made of stainless steel is 23.5g. That is, the weight of the composite support part prepared by the second embodiment of the application is reduced by 51.4% compared with the stainless steel part. The composite support part prepared by the second embodiment is subjected to 200,000 times of bending test, and no cracking problem occurs, and the flatness is still good after the test.

[0117] Third embodiment

[0118] The third embodiment of this application is generally similar to the preparation method provided in the first embodiment in terms of steps, except that the first and second plates used in step S101 are different, the rolling reduction in step S1073 and the number of cold rolling passes in step S1075 are different, and some processing steps in S203 are different. The specific differences from the first embodiment are explained below:

[0119] In step S101, the first plate is a 0.4mm thick O-state SUS316L stainless steel plate, and the second plate is a 0.3mm thick 5052 aluminum alloy plate.

[0120] It should be noted that the first board material and Figure 7 The 35 structure shown is similar, and here it is referred to as... Figure 7 Taking an example, the first plate 33 further includes a first surface 352 and a second surface 353. The two surfaces to be laminated on the first plate include a first surface to be laminated 3011 and a second surface to be laminated 3013. The first surface 352 and the second surface 353 are disposed opposite each other along a first direction, and the first surface to be laminated 3011 and the second surface to be laminated 3013 of the first plate are respectively connected between the first surface 352 and the second surface 353. Both the first surface to be laminated 3011 and the second surface to be laminated 3013 of the first plate include a stepped surface formed by a first connecting surface 3015, a second connecting surface 3016, and a third connecting surface 3017. The first connecting surface 3015 connects the first surface 352 and the second connecting surface 3016, and the third connecting surface 3017 connects the second connecting surface 3016 and the second surface 353. The first surface 352, the second surface 353, and the second connecting surface 3016 are arranged parallel to each other. The distance between the second connecting surface 3016 and the first surface 352 is within the range of one-quarter to one-half of the thickness of the first plate. In this embodiment, the distance between the second connecting surface 3016 and the first surface 352 is 0.2 mm, and the width of the second connecting surface 3016 along the second direction is 1 mm. It can be understood that the distance between the second connecting surface 3016 and the first surface 352 can be set as needed, and the width of the second connecting surface 3016 along the second direction can be set as needed. It can be understood that the distance between the second connecting surface 3016 and the first surface 352 is not limited.

[0121] In some implementations, please refer to Figure 8As shown, the first surface to be compounded 3011 and the second surface to be compounded 3013 each include an L-shaped surface formed by a first connecting surface 3015 and a second connecting surface 3016, the first connecting surface 3015 is connected between the second surface 353 and the second connecting surface 3016, the second connecting surface 3016 extends along the second direction, the length of the second connecting surface 3016 is substantially the same as the length of the second plate along the second direction, and in step 105, i.e., the step of arranging the first plate and the second plate along the direction perpendicular to the thickness direction of the first plate, the second plate is located on the second connecting surface 3016, and the surface to be compounded of the second plate is in close contact with the second connecting surface 3016 and the first connecting surface 3015.

[0122] The reduction in step S1073 is 40%.

[0123] In step S1073, the number of cold rolling passes is 2, and the reduction of each pass is 8%, thereby obtaining a 5052 aluminum alloy / SUS316L stainless steel / 5052 aluminum alloy preformed composite plate with a thickness of 0.2 mm.

[0124] In step S1091, the preformed composite plate is cut into pieces to form a composite support component with a preset size, which can be a width of 120 mm along the second direction and a length of 150 mm along the third direction. The width of the bendable part made of the first metal material along the second direction is about 38-40 mm.

[0125] In step S1095, the width of the bendable region is about 18 mm, and the width of each opening is 0.25 mm.

[0126] Under the same size, the weight of the composite support component prepared by the third embodiment of the present application is about 13.0 g, and the weight of the support component made of stainless steel material is about 25.4 g, i.e., the weight of the composite support component prepared by the second embodiment of the present application is reduced by 49.0% compared with the stainless steel component. The composite support component prepared by the third embodiment of the present application is subjected to 200,000 times of bending test, and no cracking problem occurs, and the flatness is still good after the test.

[0127] Fourth embodiment

[0128] The fourth embodiment of the present application and the preparation method provided by the third embodiment are substantially similar in steps, except that the first plate and the second plate selected in step S101 are different, step S1071 can be omitted, the rolling reduction in step S1073 and the number of cold rolling passes in step S1075, and part of the processing steps in S203. The specific differences from the third embodiment are described below:

[0129] In step S101, the first plate material is selected as a 0.4mm-thick O-state SUS304 stainless steel plate material, and the second plate material is selected as a 0.3mm-thick TA4 titanium alloy plate material.

[0130] In step S1073, the rolling reduction is 30%.

[0131] In step S1075, the number of cold rolling passes is multiple, and the reduction of each pass is gradually reduced, so as to obtain a TA4 titanium alloy / SUS304 stainless steel / TA4 titanium alloy preformed composite plate material with a thickness of about 0.2mm. Controlling the reduction of the cold rolling passes can reduce the cracking problem of the plate material, and is also conducive to improving the flatness of the composite plate material.

[0132] In step S1095, the width of each opening is 0.20mm.

[0133] Compared with the support component made of a single titanium alloy material, the composite support component prepared by the fourth embodiment has a lower etching processing cost and a higher strength of the bendable part.

[0134] Fifth Embodiment

[0135] The preparation method provided by the fifth embodiment is similar to that of the third embodiment, except that the first plate material and the second plate material selected in step S101 are different, step S1071 can be omitted, and step S1075 adopts multiple cold rolling passes. The specific differences from the third embodiment are described below.

[0136] In step S101, the first plate material is selected as a 0.4mm-thick high-thermal-conductivity copper alloy (Cu-3.8Ni-0.9Si) plate material, and the second plate material is selected as a 0.4mm-thick 5083 aluminum alloy plate material.

[0137] It should be noted that the first plate material is similar to the 35 structure shown in the third embodiment, and hereinafter the 35 structure is described as an example. Figure 5 Figure 5 ​For example, the first plate has a substantially trapezoidal cross section. The first plate further includes a first surface 352 and a second surface 353. The two surfaces to be combined of the first plate include a first surface to be combined 3011 and a second surface to be combined 3013. The first surface 352 and the second surface 353 are oppositely arranged along a first direction, and the first surface to be combined 3011 and the second surface to be combined 3013 of the first plate are respectively connected between the first surface 352 and the second surface 353. The included angle between the first surface to be combined 3011 and the first surface 352 is an obtuse angle of 135 degrees, and the included angle between the second surface to be combined 3013 and the first surface 352 is an obtuse angle of 135 degrees. In other words, the two surfaces to be combined of the first plate are both inclined surfaces. The surface to be combined of the second plate is an inclined surface that matches the surface to be combined of the first plate. The included angle between the surface to be combined of the first plate and the first surface is not limited.

[0138] In step S1075, the cold rolling is performed in multiple passes, and the reduction of each pass is gradually reduced, to obtain a 5083 aluminum alloy / copper alloy / 5083 aluminum alloy preformed composite plate with a thickness of 0.15 mm.

[0139] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A composite support member for supporting a flexible screen, characterized by, The composite supporting part comprises a supporting part and a bendable part, the supporting part and the bendable part are distributed and fixedly connected along a direction perpendicular to a thickness direction of the supporting part, the bendable part is bendable, the bendable part is made of a first metal material, the supporting part is made of a second metal material, the supporting part is a single-layer structure, the density of the first metal material is greater than the density of the second metal material, the elastic modulus of the first metal material is greater than the elastic modulus of the second metal material, the strength of the first metal material is greater than the strength of the second metal material, the bendable part comprises a first surface, a second surface and a rolling composite surface, the first surface and the second surface are oppositely arranged along a thickness direction of the bendable part, the rolling composite surface is located between the first surface and the second surface, the supporting part comprises a rolling bonding surface, the rolling composite surface and the rolling bonding surface are inlayed and bonded together by plastic deformation of the first metal material and the second metal material during rolling.

2. The composite support member of claim 1, wherein, The rolling composite surface comprises a stepped surface formed by a first connecting surface, a second connecting surface and a third connecting surface, the first connecting surface is connected between the first surface and the second connecting surface, the third connecting surface is connected between the second connecting surface and the second surface, and the rolling bonding surface is fixedly connected with the first connecting surface, the second connecting surface and the third connecting surface.

3. The composite support member of claim 1, wherein, The rolling composite surface comprises an L-shaped surface formed by a first connecting surface and a second connecting surface, the first connecting surface is connected between the second surface and the second connecting surface, the rolling bonding surface is fixedly connected with the first connecting surface and the second connecting surface, and the supporting part extends along the second connecting surface.

4. The composite support member of any of claims 1-3, wherein, The first metal material is stainless steel, and the second metal material is one of aluminum alloy, titanium alloy, copper alloy and magnesium alloy.

5. The composite support member of any of claims 1-3, wherein, The first metal material is titanium alloy, and the second metal material is one of aluminum alloy and magnesium alloy.

6. The composite support member of any of claims 1-3, wherein, The first metal material is copper alloy, and the second metal material is one of aluminum alloy, magnesium alloy and titanium alloy.

7. The composite support member of claim 1, wherein, The bendable part is provided with a plurality of openings.

8. A folding terminal, characterized by comprising: The composite supporting part comprises a flexible screen and a composite supporting part according to any one of claims 1-7, and the flexible screen is fixed on the supporting part.

9. A method of making a composite support member, characterized by, The composite supporting part comprises a flexible screen and a composite supporting part according to any one of claims 1-7, and the flexible screen is fixed on the supporting part. A first plate made of a first metal material and a second plate made of a second metal material are provided, the density of the first metal material is greater than the density of the second metal material, the elastic modulus of the first metal material is greater than the elastic modulus of the second metal material, the strength of the first metal material is greater than the strength of the second metal material, and the thickness direction of the first plate is a first direction. The first plate material and the second plate material are compounded to form a composite support component, the composite support component comprising a bendable part formed by the first plate material and a support part formed by the second plate material, the support part being a single-layer structure, the support part and the bendable part being distributed along a second direction perpendicular to the first direction, the bendable part being bendable, the bendable part comprising a first surface, a second surface and a rolling compound surface, the first surface and the second surface being oppositely arranged along a thickness direction of the bendable part, the rolling compound surface being between the first surface and the second surface, the support part comprising a rolling bonding surface, the rolling compound surface and the rolling bonding surface being inlay-bonded together by plastic deformation of the first metal material and the second metal material during rolling.

10. The method of claim 9, wherein, The first plate material and the second plate material are compounded to form a composite support component, the composite support component comprising a bendable part formed by the first plate material and a support part formed by the second plate material, the support part being a single-layer structure, the support part and the bendable part being distributed along a second direction perpendicular to the first direction, the bendable part being bendable, the bendable part comprising a first surface, a second surface and a rolling compound surface, the first surface and the second surface being oppositely arranged along a thickness direction of the bendable part, the rolling compound surface being between the first surface and the second surface, the support part comprising a rolling bonding surface, the rolling compound surface and the rolling bonding surface being inlay-bonded together by plastic deformation of the first metal material and the second metal material during rolling. The first plate material and the second plate material are compounded to form a composite support component, the composite support component comprising a bendable part formed by the first plate material and a support part formed by the second plate material, the support part being a single-layer structure, the support part and the bendable part being distributed along a second direction perpendicular to the first direction, the bendable part being bendable, the bendable part comprising a first surface, a second surface and a rolling compound surface, the first surface and the second surface being oppositely arranged along a thickness direction of the bendable part, the rolling compound surface being between the first surface and the second surface, the support part comprising a rolling bonding surface, the rolling compound surface and the rolling bonding surface being inlay-bonded together by plastic deformation of the first metal material and the second metal material during rolling. The first plate material and the second plate material are compounded to form a composite support component, the composite support component comprising a bendable part formed by the first plate material and a support part formed by the second plate material, the support part being a single-layer structure, the support part and the bendable part being distributed along a second direction perpendicular to the first direction, the bendable part being bendable, the bendable part comprising a first surface, a second surface and a rolling compound surface, the first surface and the second surface being oppositely arranged along a thickness direction of the bendable part, the rolling compound surface being between the first surface and the second surface, the support part comprising a rolling bonding surface, the rolling compound surface and the rolling bonding surface being inlay-bonded together by plastic deformation of the first metal material and the second metal material during rolling.

11. The method of claim 10, wherein, The first plate material and the second plate material are compounded to form a composite support component, the composite support component comprising a bendable part formed by the first plate material and a support part formed by the second plate material, the support part being a single-layer structure, the support part and the bendable part being distributed along a second direction perpendicular to the first direction, the bendable part being bendable, the bendable part comprising a first surface, a second surface and a rolling compound surface, the first surface and the second surface being oppositely arranged along a thickness direction of the bendable part, the rolling compound surface being between the first surface and the second surface, the support part comprising a rolling bonding surface, the rolling compound surface and the rolling bonding surface being inlay-bonded together by plastic deformation of the first metal material and the second metal material during rolling. The first plate material and the second plate material are compounded to form a composite support component, the composite support component comprising a bendable part formed by the first plate material and a support part formed by the second plate material, the support part being a single-layer structure, the support part and the bendable part being distributed along a second direction perpendicular to the first direction, the bendable part being bendable, the bendable part comprising a first surface, a second surface and a rolling compound surface, the first surface and the second surface being oppositely arranged along a thickness direction of the bendable part, the rolling compound surface being between the first surface and the second surface, the support part comprising a rolling bonding surface, the rolling compound surface and the rolling bonding surface being inlay-bonded together by plastic deformation of the first metal material and the second metal material during rolling.

12. The method of claim 11, wherein, ​ ​ ​ 13. The method of any one of claims 10-12, wherein, ​ ​

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