CN112172371A

CN112172371A - Structural member, method for manufacturing structural member, and electronic device

Info

Publication number: CN112172371A
Application number: CN201910593868.XA
Authority: CN
Inventors: 赵岩峰
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2021-01-05
Also published as: WO2021000879A1

Abstract

The application relates to a structural member, a manufacturing method of the structural member and electronic equipment, wherein the manufacturing method of the structural member comprises the following steps: step S110, manufacturing a base material which is a high-transparency base material; step S120, manufacturing a membrane, and manufacturing a coating on the membrane through ink-jet printing; step S130, placing the base material and the film with the coating into a mold, wherein the coating faces to the inner surface of the base material; step S140, the mold is closed and vacuumized, so that the coating layer on the membrane is transferred to one side of the inner surface of the substrate. Because the coating is located one side of the internal surface of substrate to the coating can be protected by the substrate, under the condition of promoting the aesthetic measure of battery cover, the coating can not worn, also does not have the risk of droing, life extension. The outer surface of the base material is exposed, so that the base material has better hand feeling and higher wear resistance. The coating is printed on the structural member in the modes of ink-jet printing and transfer printing, has better appearance effect and designability compared with direct spraying, enriches the decorative effect of the structural member and improves the yield.

Description

Structural member, method for manufacturing structural member, and electronic device

Technical Field

The present disclosure relates to the field of electronic devices, and in particular, to a structural member, a method for manufacturing the structural member, and an electronic device.

Background

Ceramic or glass structural members are widely applied to electronic equipment, and a biscuit of the ceramic or glass structural member is usually in one color, such as black, white, red, blue and the like, and has a monotonous appearance; other colors are coated on the surface of the ceramic or glass structural member in a spraying or Physical Vapor Deposition (PVD) mode, so that the surface wear resistance of the ceramic structural member is reduced, and the hand feeling is poor.

Disclosure of Invention

In a first aspect of the present application, a method for manufacturing a structural member is provided in an embodiment to solve the technical problems of monotonous appearance, poor wear resistance and poor hand feeling of the structural member.

A method of making a structural member comprising the steps of:

step S110, manufacturing a base material, wherein the base material is a high-transparency base material;

step S120, manufacturing a membrane, and manufacturing a coating on one side of the membrane through ink-jet printing;

step S130, placing the substrate and the membrane with the coating into a mold, wherein the coating faces to the inner surface of the substrate;

and step S140, closing the die and vacuumizing so that the coating on the membrane is transferred to one side of the inner surface of the base material.

The structural part comprises a base material with high transparency, a membrane and a coating layer, wherein the coating layer is prepared by ink-jet printing on the membrane; the coating is transferred to one side of the inner surface of the base material, and the coating is positioned on one side of the inner surface of the base material, so that the coating can be protected by the base material, and under the condition of improving the aesthetic measure of the battery cover, the coating cannot be worn and does not have the risk of falling off, and the service life of the coating is prolonged. The outer surface of the base material is exposed, so that the base material has better hand feeling and higher wear resistance. The coating is printed on the structural member in the modes of ink-jet printing and transfer printing, has better appearance effect and designability compared with direct spraying, enriches the decorative effect of the structural member and improves the yield.

In one embodiment, in step S110, ceramic powder is mixed with a binder, and a ceramic green body is obtained by injection molding, tape casting, or dry pressing.

In one embodiment, the ceramic powder comprises a zirconia powder or a zirconium nitride powder; the adhesive comprises one or more of paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate and polyformaldehyde.

In one embodiment, the ceramic green body is subjected to binder removal and sintering to obtain the substrate.

In one embodiment, in step S120, an effect map is created, and the ink ejection amount is analyzed and determined through the effect map; and spraying ink on the membrane in an ink-jet printing mode to form the coating layer identical to the effect graph.

In one embodiment, the method includes step S115 of spraying a polyurethane coating on the inner surface of the substrate to form a paint layer with a light transmittance of not less than 75%.

In one embodiment, in step S130, the mold comprises an upper mold and a lower mold, and the upper mold and the lower mold are preheated to 150 ℃ to 170 ℃; and placing the base material in the lower die, wherein the outer surface of the base material is attached to the die cavity of the lower die, and the membrane with the coating is placed in the lower die and covers the inner surface of the base material, and the coating faces to the paint layer.

In one embodiment, in step S140, the mold is closed, vacuumized and maintained at a constant temperature, and the coating layer is transferred to the paint layer; and peeling off the membrane.

In one embodiment, step S150 is included, ink is sprayed on a side of the paint layer away from the substrate to form a primer.

In one embodiment, the substrate has a light transmittance of not less than 1%.

In a second aspect of the present application, an embodiment provides a structural member to solve the technical problems of the structural member, such as monotonous appearance, poor wear resistance and poor hand feeling.

A structural member is made by the method for manufacturing the structural member.

The coating of above-mentioned structure is located one side of the internal surface of substrate to the coating can be protected by the substrate, under the condition of promoting the aesthetic measure of battery cover, the coating can not worn out, does not have the risk that drops yet, makes the life of coating prolong. The outer surface of the base material is exposed, so that the base material has better hand feeling and higher wear resistance. The coating is printed on the structural member in the modes of ink-jet printing and transfer printing, has better appearance effect and designability compared with direct spraying, enriches the decorative effect of the structural member and improves the yield.

In one embodiment, the structural member is a battery cover or a middle frame or an integrally formed battery cover and a middle frame.

In a third aspect of the present application, an embodiment provides an electronic device to solve the technical problems of the structural member with a monotonous appearance, poor wear resistance and poor hand feeling.

An electronic device comprises the structural component manufactured by the manufacturing method of the structural component.

The electronic equipment comprises a structural part, wherein the manufacturing process of the structural part comprises the steps of manufacturing a high-transparency base material, manufacturing a membrane and carrying out ink-jet printing on the membrane to obtain a coating; the coating is transferred to one side of the inner surface of the base material, and the coating is positioned on one side of the inner surface of the base material, so that the coating can be protected by the base material, and under the condition of improving the aesthetic measure of the battery cover, the coating cannot be worn and does not have the risk of falling off, and the service life of the coating is prolonged. The outer surface of the base material is exposed, so that the base material has better hand feeling and higher wear resistance. The coating is printed on the structural member in the modes of ink-jet printing and transfer printing, has better appearance effect and designability compared with direct spraying, enriches the decorative effect of the structural member and improves the yield.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a perspective view of an electronic device according to an embodiment;

fig. 2 is a perspective view of a battery cover of the electronic device shown in fig. 1;

FIG. 3 is a cross-sectional view of the cell cover shown in FIG. 2;

fig. 4 is a flowchart illustrating a manufacturing process of a battery cover according to an embodiment;

FIG. 5 is a flow chart illustrating a method of fabricating a substrate according to one embodiment;

FIG. 6 is a diagram illustrating an exemplary process for manufacturing a battery cover, wherein a coating layer on a membrane is to be transferred to a substrate;

FIG. 7 is a process diagram of the battery cover of FIG. 6 in which the coating on the membrane is transferred to a substrate;

FIG. 8 is a cross-sectional view of the substrate in step S110 of the manufacturing flow chart shown in FIG. 4;

FIG. 9 is a cross-sectional view of the substrate of FIG. 8, wherein the inner surface of the substrate is provided with a paint layer;

FIG. 10 is a cross-sectional view of the structure of FIG. 9, wherein a coating layer is transferred to the paint layer;

FIG. 11 is a cross-sectional view of the structure shown in FIG. 10, wherein the coating has penetrated into the lacquer layer;

fig. 12 is a flowchart illustrating a manufacturing process of a battery cover according to another embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As used herein, "terminal device" refers to a device capable of receiving and/or transmitting communication signals including, but not limited to, devices connected via any one or more of the following connections:

(1) via wireline connections, such as via Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connections;

(2) via a Wireless interface means such as a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter.

A terminal device arranged to communicate over a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

(1) satellite or cellular telephones;

(2) personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities;

(3) radiotelephones, pagers, internet/intranet access, Web browsers, notebooks, calendars, Personal Digital Assistants (PDAs) equipped with Global Positioning System (GPS) receivers;

(4) conventional laptop and/or palmtop receivers;

(5) conventional laptop and/or palmtop radiotelephone transceivers, and the like.

As shown in fig. 1 and 2, in an embodiment, an electronic device 10 is provided, and the electronic device 10 may be a smartphone, a computer, or a tablet. The electronic device 10 includes a display panel assembly 200, a structural member, a middle frame, and a circuit board, wherein the structural member may be made of ceramic or glass, and in this application, the structural member is described by taking a battery cover 100 made of ceramic as an example. It can be understood that the structural member can also be a middle frame, a key, a camera decorating ring, a fingerprint decorating ring and the like; in another embodiment, the structural member may be an integral form of a center frame and a rear cover of an integrally formed fuselage (unibody) structure. The display screen assembly 200 and the battery cover 100 are respectively fixed on two sides of the middle frame, the display screen assembly 200, the middle frame and the battery cover 100 together form an external structure of the electronic device 10, the circuit board is located inside the electronic device 10, and electronic elements such as a controller, a storage unit, a power management unit, a baseband chip and the like are integrated on the circuit board. The display screen assembly 200 is used to display pictures or fonts, and the circuit board can control the operation of the electronic device 10.

In one embodiment, the Display panel assembly 200 uses an LCD (Liquid Crystal Display) panel for displaying information, and the LCD panel may be a TFT (Thin Film Transistor) screen or an IPS (In-Plane Switching) screen or an SLCD (split Liquid Crystal Display) screen. In another embodiment, the display panel assembly 200 employs an OLED (Organic Light-Emitting display) panel for displaying information, and the OLED panel may be an AMOLED (Active Matrix Organic Light-Emitting Diode) screen or a Super AMOLED (Super Active Matrix Organic Light-Emitting Diode) screen or a Super AMOLED Plus (Super Active Matrix Organic Light-Emitting Diode) screen. Under the control of the controller, the display screen assembly 200 can display information and can provide an operation interface for a user.

As shown in fig. 3, in one embodiment, the battery cover 100 includes a substrate 110, a coating layer 130, a paint layer 120, and a primer 140. The material of the substrate 110 is a high-transmittance ceramic, and the light transmittance of the substrate 110 is not less than 1%, and may be 1% to 2%, so that the substrate 110 has a high-transmittance effect. The substrate 110 includes an outer surface 111 and an inner surface 112, the outer surface 111 being a surface of the substrate 110 facing away from the display panel assembly 200, and the inner surface 112 being a surface of the substrate 110 facing the interior of the electronic device 10. The inner surface 112 is provided with a coating 130 and a paint layer 120, and the paint layer 120 is formed by spraying a transparent Polyurethane (PU) liquid paint, so that the light transmittance of the paint layer 120 is not less than 75%, and can be 100%. The thickness of the paint layer 120 is 10 μm, and the paint layer 120 has defects such as high gloss and no pinhole, etc. The coating 130 may include patterns or characters, and the coating 130 penetrates into the paint layer 120, and the paint layer 120 has a uniform gloss, so that the texture and color of the coating 130 can be well displayed, and the inner surface 112 of the substrate 110 has a good decorative effect. The coating layer 130 is exposed from one side of the outer surface 111 through the transparent paint layer 120 and the substrate 110 having a high transmittance characteristic, so that the battery cover 100 has both a ceramic touch and a good decorative effect. The coating 130 is disposed on one side of the inner surface 112 of the substrate 110, so that a user does not touch the coating 130 during using the electronic device 10, the coating 130 is not scratched or damaged, and the service life of the coating is prolonged. The primer 140 is located on the side of the paint layer 120 facing away from the substrate 110 and is formed by spraying white ink. The thickness of the primer 140 is 10 to 15 μm. The primer 140 is opaque and covers the coating 130, so that the coating 130 can be refracted through the paint layer 120 and the substrate 110 with high light transmittance, so that a user can observe the coating 130 from one side of the outer surface 111 of the substrate 110, thereby improving the aesthetic appearance of the electronic device 10.

As shown in fig. 4, in one embodiment, a method for manufacturing a structural member is provided, including:

step S110, manufacturing a substrate 110;

step S120, manufacturing a membrane 300, and manufacturing a coating 130 on the membrane 300 through ink-jet printing;

step S130, placing the substrate 110 and the film 300 with the coating 130 into a mold, wherein the coating 130 faces the inner surface 112 of the substrate 110;

in step S140, the mold is closed and evacuated so that the coating 130 on the membrane 300 is transferred to one side of the inner surface 112 of the substrate 110.

In one embodiment, as shown in fig. 5, ceramic powder is mixed with a binder and a ceramic green body is prepared by injection molding or tape casting or dry press molding. And performing glue discharging and sintering on the ceramic green body to obtain the substrate 110. Specifically, the ceramic powder may include alumina powder, zirconia powder or zirconium nitride powder and corresponding mixtures, and the powder purity is above 99.99%, depending on the type of ceramic of the substrate 110. The binder may be one or more selected from paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate, and polyoxymethylene. The mass percentage of the ceramic powder is 70-99%, the mass percentage of the adhesive is 1-30%, and the concrete reference is based on the selected ceramic preparation process. In another embodiment, in order to increase the light transmittance of the substrate 110, the aluminum oxide powder may be reduced in mass percentage so that the aluminum oxide powder is less than 0.25% by mass, and the light transmittance of the substrate 110 can be increased. In still another embodiment, the light transmittance of the substrate 110 may be increased by reducing impurities in the ceramic powder and the binder and reducing the number of pores during injection molding or tape casting or dry pressing.

As shown in FIG. 5, in one embodiment, the ceramic green body is placed in a degumming box to remove glue or degrease, wherein the glue removing or degreasing temperature is controlled below 400 ℃, and the time is controlled to be 0.5-4 h. After the rubber is removed or degreased, the sample has no problems of distortion, cracking, heterochromous and the like. And placing the ceramic green body after the rubber removal into a sintering furnace, and sintering in a reducing or oxidizing or inert atmosphere to obtain the ceramic green body. The sintering temperature is more than 1200 ℃, and the sintering time is 0.5-10 h. The ceramic body prepared under the technological parameters of the glue discharging and the degreasing can reach the states of minimum air holes, maximum shrinkage rate, most compact product and best performance. The ceramic body is post-processed to produce the substrate 110. The post-processing comprises grinding and polishing the ceramic blank obtained after sintering, performing CNC machining to enable the substrate 110 to meet the size requirement, and detecting the surface quality of the substrate 110.

In one embodiment, the Logo is prepared on the inner surface 112 of the substrate 110 by a silk-screen printing method or a physical vapor deposition method, and the Logo may be a text or a pattern. Logo can be exposed from one side of the outer surface 111 of the base material 110 through the high-transmittance base material 110, so that the battery cover 100 has a Logo.

In one embodiment, a transparent paint layer 120 is formed on the inner surface 112 of the highly transparent substrate 110, and the coating layer 130 is formed on the paint layer 120 by ink-jet printing. And (3) making an effect graph by adopting software, analyzing and determining the ink jet amount through the effect graph, and jetting ink on the membrane in an ink jet printing mode to form the coating 130 which is the same as the effect graph, namely the pattern and the color of the coating 130 are the same as the effect graph. The film is attached to the paint layer 120, so that the coating 130 is transferred to the paint layer 120 and the film is peeled off, and the battery cover 100, which comprises the substrate 110, the paint layer 120 positioned on the inner surface 112 of the substrate 110 and the structural member of the coating 130 penetrating into the paint layer 120, is manufactured, wherein the outer surface of the battery cover 100 is in a ceramic hand feeling, and the decorative effect of the battery cover 100 is good.

As shown in fig. 8 and 9, in one embodiment, the inner surface 112 of the substrate 110 is coated with PU liquid paint (polyurethane paint), the thickness of the formed paint layer 120 is 10 μm, and the paint layer 120 has defects such as high gloss and no pinhole and pock marks. The light transmittance of the paint layer 120 is not less than 75%, and the paint layer 120 has a uniform gloss, so that the textile and color of the coating 130 can be well displayed, and the inner surface 112 of the substrate 110 has a good decorative effect. In another embodiment, the inner surface 112 of the substrate 110 may not be provided with the paint layer 120, and the coating layer 130 is directly transferred to the inner surface 112 of the substrate 110, so that the structural member has both a ceramic hand feeling and a better decorative effect.

In one embodiment, in step S120, a membrane 300 is fabricated. The diaphragm 300 is made of a transparent material, so that the light transmittance of the diaphragm 300 is not less than 75%. In one embodiment, the membrane 300 may be made of transparent PET (Polyethylene terephthalate). In another embodiment, the membrane 300 may be made of PO (polyolefin), a-PET (Amorphous Polyethylene Terephthalate), PETG (Polyethylene Terephthalate-1, 4-cyclohexanedimethanol Terephthalate), PC (Polycarbonate), PMMA (Polymethyl methacrylate), or the like. In another embodiment, the film 300 may also be made of a special inkjet thermal transfer paper, which has a three-layer structure, wherein the top layer is a functional coating 130 for absorbing ink and separating dye, the middle layer is a base paper, and the bottom layer is a coating 130 for resisting warping.

In one embodiment, in step S120, the effect map of the coating 130 is made by software. The effect graph can be a color effect graph or a pattern effect graph with pictures or fonts. In another embodiment, the effect map may also be a texture, which is not specifically limited herein. The effect map of the coating 130 is generally made by photoshop or Adobe Illustrator (AI) software or Croeldraw software, and in another embodiment, the effect map of the coating 130 can be made by other software. The effect map includes a plurality of color blocks, and the ratio of cyan ink (C), magenta ink (M), yellow ink (Y), and black ink (K) in a single color block is analyzed, that is, CMYK parameters in a single color block are analyzed, so as to determine the ink ejection amount of the specific color ink required for a specific position of the diaphragm 300. In the color gradient area of the effect picture, the gradual change of the color is realized by controlling the gradual increase or decrease of the proportion of the liquid drops of the different color inks, and the sudden change of the color is prevented. And (3) performing ink-jet printing by using a high-precision ink-jet printer. The ink-jet printer includes at least 4 heads, and cyan ink, magenta ink, yellow ink, and black ink correspond to at least one of the heads, respectively. The nozzle is capable of moving within the confines of the substrate 110. it is understood that the nozzle is capable of moving and ejecting ink according to a program set by the software after analyzing the effect map to form the coating 130 on the substrate 110. The diameter of the liquid drop ejected by the nozzle is not more than 20um, and in a single color block of the coating 130, the ink can include ink of one color, or ink of multiple colors, and the ink of different colors can be overlapped to form ink of other colors. The inkjet head ejects ink according to the proportion of each color ink in the single color block determined after the software analyzes the effect map to form the coating 130 identical to the effect map, and the pattern and the color of the coating 130 are identical to the effect map.

In another embodiment, to improve the fineness of the color, the inks further include a low-density cyan ink, a low-density red ink, and a low-density yellow ink. A high-precision inkjet printer including at least 7 heads is required, and cyan ink, magenta ink, yellow ink, black ink, low-density cyan ink, low-density red ink, and low-density yellow ink correspond to at least one head, respectively. The nozzle can move within the range of the surface of the substrate 110, and it is understood that the nozzle can move and spray ink according to a program set after analyzing the effect map by software, and the coating layer 130 is formed on the surface of the substrate 110. The diameter of the liquid drop ejected by the nozzle is not more than 20um, and in a single color block of the coating 130, the ink can include ink of one color, or ink of multiple colors, and the ink of different colors can be overlapped to form ink of other colors. The ink jet head ejects ink according to the proportion of each color ink in the single color block determined after the software analyzes the effect graph so as to form the coating layer identical to the effect graph.

The pixels presented by the coating 130 are determined, among other things, by the number and accuracy of the nozzles of the ink jet printer. The thickness of the coating 130 is 2 μm to 3 μm. In other embodiments, the coating 130 may be printed on the membrane 300 using screen printing, gravure printing, or the like. As shown in fig. 6, 7 and 10, in one embodiment, a mold is prepared, the mold including upper and lower dies 410, the upper and lower dies 410 being completed using an aluminum alloy CNC machining. The upper and lower dies 410 are designed and processed according to the 3D drawing of the substrate 110 to ensure that the membrane 300 and the substrate 110 can be fixed after the dies are closed. The upper and lower dies 410 of the mold are preheated to 150-170 ℃, the base material 110 is placed on the lower die 410, and the outer surface 111 of the base material 110 is attached to the cavity of the lower die 410. The membrane 300 with the coating 130 is placed over the substrate 110 with the coating 130 facing the inner surface 112 of the substrate 110. And (3) closing the upper die and the lower die 410, vacuumizing to generate negative pressure with the pressure of 0-0.05 MPa, so that the diaphragm 300 is tightly wrapped on the inner surface 112 of the base material 110. Meanwhile, the heat preservation temperature of the die cavity of the die is 150-170 ℃, and the heat preservation time is 30-60 s. As shown in fig. 10 and 11, the ink of the coating 130 is ensured to penetrate into the paint layer 120 formed by the PU liquid paint on the surface of the substrate 110 by the action of temperature and pressure, so that the coating 130 on the membrane 300 is transferred to the paint layer 120 on the inner surface 112 of the substrate 110. The film is then peeled from substrate 110.

As shown in fig. 12, in one embodiment, a step S150 is included to spray ink on a side of the paint layer 120 away from the substrate 110 to form the primer 140. Specifically, a spray gun is used for spraying white ink on the side, far away from the base material 110, of the paint layer 120 to form the primer 140, wherein in the white ink, the mass percentage of the gloss oil is 50% -60%, the mass percentage of the curing agent is 15% -40%, and the mass percentage of the diluent is 10% -30%. The viscosity of the white ink is 8 to 12 Pa.s. The distance between the spray gun and the base material 110 is 10cm, the sample rotation speed is 10-60 degrees/s, the spraying speed is 600mm/s, the ink supply pressure is 200Pa, the atomization pressure is 300Pa, and the ejection pressure is 350 Pa. And baking the sprayed white ink at the baking temperature of 80-90 ℃ for 50-60 min to ensure that the thickness of the white ink is 10-15 mu m, namely the thickness of the primer 140 is 10-15 mu m. In another embodiment, an explosion-proof film is attached to the side of the primer 140 away from the substrate 110 to prevent fragments from splashing when the battery cover 100 is broken.

The battery cover 100 made herein includes a high-transparency substrate 110, a transparent paint layer 120, a coating layer 130 penetrating into the paint layer 120, and a primer 140. The outer surface of the cell cover 100 is the outer surface 111 of the substrate 110, so that the cell cover 100 has better ceramic hand feeling and higher wear resistance. The paint layer 120, the coating layer 130 and the primer 140 are positioned on one side of the inner surface 112 of the battery hanger, the coating layer 130 is protected by the substrate, the coating layer 130 is refracted to one side of the outer surface of the battery cover 100 through the transparent paint layer 120 and the high-transmittance substrate 110, under the condition of improving the aesthetic degree of the battery cover 100, the coating layer 130 cannot be abraded, the risk of falling does not exist, and the service life of the coating layer 130 is prolonged. The coating 130 is printed on the battery cover 100 by software design in an ink-jet printing and transfer printing mode, and has better appearance effect and designability compared with direct spraying, so that the coating 130 of the battery cover 100 has the same effect as the software design, the decoration effect of the battery cover 100 is enriched, and the yield is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method for manufacturing a structural member, comprising the steps of:

2. The method of claim 1, wherein in step S110, the ceramic powder is mixed with a binder and the ceramic green body is obtained by injection molding, tape casting, or dry pressing.

3. The method of manufacturing a structural member according to claim 2, wherein the ceramic powder comprises zirconia powder or zirconium nitride powder; the adhesive comprises one or more of paraffin, polyethylene glycol, stearic acid, dioctyl phthalate, polyethylene, polypropylene, polymethyl methacrylate and polyformaldehyde.

4. The method of manufacturing a structural member according to claim 2, wherein the base material is obtained by de-gumming and sintering the ceramic green body.

5. The method for manufacturing a structural member according to claim 1, wherein in step S120, an effect map is manufactured, and an amount of ink ejection is analyzed and determined from the effect map; and spraying ink on the membrane in an ink-jet printing mode to form the coating layer identical to the effect graph.

6. The method for manufacturing a structural member according to claim 1, comprising a step S115 of spraying a polyurethane paint on the inner surface of the substrate to form a paint layer having a light transmittance of not less than 75%.

7. The method for manufacturing the structural member according to claim 6, wherein in step S130, the mold comprises an upper mold and a lower mold, and the upper mold and the lower mold are preheated to 150-170 ℃; and placing the base material in the lower die, wherein the outer surface of the base material is attached to the die cavity of the lower die, and the membrane with the coating is placed in the lower die and covers the inner surface of the base material, and the coating faces to the paint layer.

8. The method of claim 6, wherein in step S140, the mold is closed, vacuumized and thermally insulated, and the coating is transferred to the paint layer; and peeling off the membrane.

9. The method for manufacturing a structural member according to claim 8, comprising step S150 of applying ink on a side of the paint layer away from the substrate to form a primer.

10. The method of making a structural member according to claim 1, wherein the substrate has a light transmittance of not less than 1%.

11. A structural member, characterized in that it is manufactured by a method of manufacturing a structural member according to any one of claims 1 to 10.

12. The structural member of claim 11, wherein the structural member is a battery cover or a middle frame or an integrally formed battery cover and middle frame.

13. An electronic device comprising the structural member produced by the method for producing a structural member according to any one of claims 1 to 10.