CN111016328A

CN111016328A - Ceramic and glass composite shell for mobile terminal to be light and thin

Info

Publication number: CN111016328A
Application number: CN201911425271.0A
Authority: CN
Inventors: 邱基华; 郑镇宏; 陈烁烁; 李喜宏
Original assignee: Chaozhou Three Circle Group Co Ltd
Current assignee: Chaozhou Three Circle Group Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-17

Abstract

The invention discloses a light and thin ceramic and glass composite shell of a mobile terminal, which comprises a ceramic layer or a glass layer and a non-metal composite material layer; the non-metal composite material layer is attached to the inner surface of the ceramic layer or the glass layer; or the non-metal composite material layer is attached to the inner surface of the ceramic layer or the glass layer through the buffer layer. The light and thin ceramic and glass shell is made of non-metal materials, and is more beneficial to the propagation of signals in the 5G era compared with metal composite materials; the appearance is covered by full ceramics and glass, so that the appearance is more attractive; compared with the all-ceramic or glass shell with the same structure, the weight is greatly reduced.

Description

Ceramic and glass composite shell for mobile terminal to be light and thin

Technical Field

The invention relates to a mobile terminal shell, in particular to a light and thin ceramic and glass composite shell of a mobile terminal.

Background

Electronic products such as mobile phone terminals, smart watches, smart appliances, etc. have become an indispensable part of people's daily life. Along with the rapid development of electrical intelligent technology, the functions of mobile terminals and intelligent electronic products are more and more powerful, the energy consumption is gradually increased, and the whole weight of corresponding hardware modules such as batteries is also increased.

At present, the mobile terminal casing is mainly made of metal, glass and ceramic. Wherein, the metal shell is subjected to T treatment on the surface of a metal matrix, nano injection molding on the metal matrix, finish machining, polishing, surface anode treatment and other processes. However, due to the conductivity of the metal material, the metal battery cover has an interference shielding effect on radio frequency signal transmission, and a plastic composite partition is often required to be performed on the metal battery cover, so that signal transmission interference is reduced. The formed plastic has poor affinity with metal, nano holes and an activating agent are formed on the surface of the aluminum alloy by T treatment with complex process and poor environmental protection, and the plastic and a metal piece can form excellent occlusion effect after injection molding. However, the basic starting point of the composite of plastic and metal is not the light weight of the housing, and the high requirements of communication technology on signal transmission cannot be met gradually. The method also adopts the method of separately attaching the inner linings of the middle frame and the bottom of the mobile terminal equipment, wherein the middle frame is generally an injection molding part, and the bottom of the middle frame is plastic. The separate attaching method has complicated working procedures, the attaching is not integrated, the performance of the joint of the middle frame and the bottom is different, and stress points are easily generated at the joint.

With the gradual maturity of the 5G communication technology, the mainstream mobile terminal device shell is gradually demetalized, and is more biased to adopt a ceramic or glass material, so as to match the high-frequency transmission of millimeter waves in the 5G communication technology. However, zirconia (microcrystalline zirconium) ceramics and glass have large density and heavy hand feeling, which affects the use experience.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a light and thin ceramic and glass composite shell of a mobile terminal.

In order to achieve the purpose, the invention adopts the technical scheme that: a light and thin ceramic and glass composite shell of a mobile terminal comprises a ceramic layer or a glass layer and a non-metal composite material layer;

the non-metal composite material layer is attached to the inner surface of the ceramic layer or the glass layer;

or the non-metal composite material layer is attached to the inner surface of the ceramic layer or the glass layer through the buffer layer.

Ceramic and glass shells are hard and brittle materials, and the impact resistance is poor. The mobile terminal light and thin ceramic and glass composite shell is compounded by adopting ceramic or glass and other materials with low density and high strength, not only utilizes the hard performance of the ceramic and the glass, but also combines the toughness of non-metallic materials, and greatly improves the shock resistance while keeping the appearance texture of the ceramic and the ceramic. In addition, plastic replacement for opening holes is not needed for solving the problem of signal shielding, and the integration of the shell is realized. The ceramic and glass are preferably one of 2.5D and 3D, Unibody, but not limited to these structures. The light and thin ceramic and glass shell is made of non-metal materials, and is more beneficial to the propagation of signals in the 5G era compared with metal composite materials; the appearance is covered by full ceramics and glass, so that the appearance is more attractive; compared with the all-ceramic or glass shell with the same structure, the weight is greatly reduced. In the shell, the buffer layer can consume part of the impact energy and transmit the impact energy to the non-metal composite layer. The inner surface of the ceramic layer or the glass layer is a surface opposite to the outer surface, the inner surface is a surface close to the internal part of the mobile terminal, and the outer surface is a surface far away from the internal part of the mobile terminal.

Preferably, the composite shell comprises a back plate rear cover and a middle frame, the outer surfaces of the back plate rear cover and the middle frame are both ceramic layers or glass layers, the outer surface of the back plate rear cover is a ceramic layer or a glass layer, and the outer surface of the middle frame is a ceramic layer or a glass layer. More preferably, the back plate rear cover and the middle frame are both provided with non-metal composite materials. The back cover of the back plate can be a plane or a curved surface.

Preferably, the material of the non-metal composite material layer comprises at least one of a glass fiber prepreg, an aramid fiber prepreg, a PP bidirectional prepreg, a modified carbon fiber prepreg, an epoxy glass fiber board, a kevlar fiber board, a polypropylene fiber board and a polyamide board.

Preferably, the tensile strength of the glass fiber prepreg, the aramid fiber prepreg, the PP bidirectional prepreg or the modified carbon fiber prepreg after thermosetting is not less than 600MPa, and the bonding force with the ceramic layer or the glass layer is not less than 70N.

Preferably, the buffer layer is made of at least one of epoxy resin glue, acrylate structural glue and modified polyurethane glue. More preferably, the material of the buffer layer is epoxy resin glue.

The buffer layer and the non-metal composite material layer can be made of materials which have uniform thickness and are perfectly matched with the ceramic layer or the glass layer.

Preferably, the epoxy resin glue comprises the following components in percentage by weight: 50-90% of resin, 10-50% of curing agent, 0.5-2% of coupling agent, 0.5-5% of accelerator, 2-8% of toughening agent and 0.5-5% of filler. The resin can provide the main properties (hardness, tensile strength, elongation, impact strength, fluidity and the like) of the epoxy resin adhesive, and the mechanical properties are controlled by adjusting the content of the components; the curing agent can react with resin to form a cross-linked network structure, the adhesive force with the ceramic glass is influenced, and the cross-linking degree and the mechanical property are influenced due to too high content; accelerators are used to adjust the curing time; the filler fumed silica can reduce the internal stress of the buffer layer and increase the thixotropy. The epoxy resin prepared according to the proportion and the composition is suitable for bonding a ceramic layer or a glass layer and a non-metal composite material, and the obtained buffer layer can obtain the bonding force of more than 70N.

Preferably, the resin comprises bisphenol a epoxy resin and bisphenol F epoxy resin; the curing agent comprises an anhydride curing agent and/or an amine curing agent; the accelerator comprises amines and derivatives thereof; the filler comprises fumed silica. More preferably, the weight ratio of the bisphenol a epoxy resin to the bisphenol F epoxy resin is: 1: 2; the curing agent is an amine curing agent; the accelerator is a tertiary amine accelerator. Most preferably, the epoxy resin glue comprises the following components in percentage by weight: 20% of bisphenol A epoxy resin, 40% of bisphenol F epoxy resin, 27.6% of amine curing agent, 1.2% of coupling agent, 4.5% of accelerator, 4.8% of toughening agent and 1.9% of filler. The resin prepared by the proportion has short curing time and best curing effect. The coupling agent can be at least one of silane coupling agent, titanate and phosphate coupling agent; the toughening agent can be at least one selected from acrylate polymers, styrene-butadiene thermoplastic elastomers, methyl methacrylate-butadiene-styrene terpolymers, acrylonitrile-butadiene-styrene copolymers, chlorinated polyethylene and ethylene-vinyl acetate copolymers.

Preferably, the thickness of the non-metal composite material layer is less than or equal to 0.5mm, the thickness of the ceramic layer or the glass layer is less than or equal to 1.0mm, and the thickness of the buffer layer is 50-80 μm. Preferably, the thickness of the ceramic layer or the glass layer is 0.2-0.45 mm, and the thickness of the non-metal composite material layer is 0.1-0.3 mm at the back cover of the back plate.

Preferably, the thickness difference between any two points of the back plate back cover is less than or equal to 0.1mm, and the thickness of the back plate back cover is 0.25-0.9 mm.

Preferably, the thickness difference between any two points of the back plate back cover is larger than 0.1mm, and the thickness of the back plate back cover is 0.3-0.45 mm.

Preferably, the weight of the non-metal composite material layer is less than or equal to 15 g; the weight of the ceramic layer is less than or equal to 30g, and the weight of the glass layer is less than or equal to 20 g.

Preferably, the preparation method of the light and thin ceramic and glass composite shell of the mobile terminal comprises the following steps: processing the ceramic or glass to a finished product, primarily curing the non-metal composite material, aligning and adhering the non-metal composite material to the inner surface of the ceramic or glass, and finally heating and pressing the non-metal composite material to obtain the composite shell. The primary curing means that the curing degree is 10-20% of the complete curing degree. When the preparation method is adopted, the non-metal composite material layer is preferably at least one of a glass fiber prepreg, an aramid fiber prepreg, a PP bidirectional prepreg and a modified carbon fiber prepreg.

Preferably, the preparation method of the light and thin ceramic and glass composite shell of the mobile terminal comprises the following steps: processing the ceramic or glass into a finished product, coating a buffer layer material on the inner surface of the ceramic or glass to form a buffer layer, attaching the primarily cured nonmetal composite material on the buffer layer in an aligned manner, and finally heating and pressing to obtain the composite shell. When the preparation method is adopted, the non-metal composite material layer is preferably at least one of a glass fiber prepreg, an aramid fiber prepreg, a PP bidirectional prepreg and a modified carbon fiber prepreg.

Preferably, the preparation method of the light and thin ceramic and glass composite shell of the mobile terminal comprises the following steps: processing the ceramic or glass into a finished product, coating a buffer layer material on the inner surface of the ceramic or glass to form a buffer layer, stamping and profiling the non-metal composite material, aligning and laminating the non-metal composite material on the buffer layer, and finally heating and laminating to obtain the composite shell. When the preparation method is adopted, the non-metal composite material layer is preferably at least one of an epoxy glass fiber board, a Kevlar fiber board, a polypropylene fiber board and polyamide.

Preferably, the thermal deformation temperature of the epoxy glass fiber board, the Kevlar fiber board, the polypropylene fiber board and the polyamide is 20-220 ℃, and the material shaping and cooling interval is 40-80 ℃. Preferably, the tensile strength of the glass fiber prepreg, the aramid fiber prepreg, the PP bidirectional prepreg and the modified carbon fiber prepreg after curing is not lower than 600 MPa.

Preferably, the preparation method of the light and thin ceramic and glass composite shell of the mobile terminal comprises the following steps: roughly processing the ceramic or glass, coating a buffer layer material on the inner surface of the roughly processed ceramic or glass to form a buffer layer, punching and profiling the non-metal composite material, aligning and laminating the non-metal composite material on the buffer layer, and heating and laminating to obtain a blank of the composite shell; and carrying out finish machining on the blank of the composite shell to obtain the composite shell. When the preparation method is adopted, the non-metal composite material layer is preferably at least one of an epoxy glass fiber board, a Kevlar fiber board, a polypropylene fiber board and polyamide. The processing technology of processing the ceramic or the glass to a finished product and then forming the buffer layer has limited processing limit of the processing thickness of the ceramic, cannot be thinned any more, has small weight reduction range on the shell, and has larger ceramic thinning degree by adopting the method of forming the buffer layer after rough processing, thereby being more beneficial to reducing the weight of the product.

Preferably, the finishing comprises the following steps in sequence: a. carrying out CNC machining on the inner surface; b. grinding and thinning the ceramic layer or the glass layer; c. and carrying out CNC (computer numerical control) shape processing, rough polishing, punching and fine polishing on the ceramic layer or the glass layer.

The ceramic and the glass are hard and brittle materials, so the machining performance is poor and the machining cost is high; the composite shell is preferably prepared by the four preparation processes, so that the processing procedures of ceramics and glass are greatly reduced, and the processing difficulty and cost of the ceramics and the glass are reduced from the process conversion angle; the ceramic and glass material is applied to the mobile terminal shell and has a market field effect. The back cover manufactured by the preparation process is an integrated composite shell,

the invention has the beneficial effects that: the invention provides a light and thin ceramic and glass composite shell of a mobile terminal. The light and thin ceramic and glass shell is made of non-metal materials, and is more beneficial to the propagation of signals in the 5G era compared with metal composite materials; the appearance is covered by full ceramics and glass, so that the appearance is more attractive; compared with the all-ceramic or glass shell with the same structure, the weight is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of a lightweight, thin ceramic and glass composite housing of a mobile terminal according to embodiments 1 to 24; wherein, 1, ceramic layer or glass layer; 2. a buffer layer; 3. a non-metallic composite material layer;

fig. 2 is a schematic structural diagram of a lightweight, thin ceramic and glass composite housing of the mobile terminal according to embodiments 25 to 30; wherein, 4, ceramic layer or glass layer; 5. a non-metallic composite layer.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.

Examples 1 to 24

The structural schematic diagram of the lightweight, thin ceramic and glass composite housing of the mobile terminal in embodiments 1 to 24 is shown in fig. 1, where the lightweight, thin ceramic and glass composite housing of the mobile terminal includes a ceramic layer or a glass layer 1, a buffer layer 2 and a non-metallic composite layer 3; the non-metal composite material layer 3 is attached to the inner surface of the ceramic layer or the glass layer 1 through the buffer layer 2, and the materials, the weight and the thickness parameters of the ceramic layer, the glass layer, the buffer layer and the non-metal composite material layer are shown in tables 1 and 2.

In embodiments 1 to 24, when the buffer layer is made of an epoxy resin adhesive, the epoxy resin adhesive contains the following components in percentage by weight: the epoxy resin adhesive comprises the following components in percentage by weight: 20% of bisphenol A epoxy resin, 40% of bisphenol F epoxy resin, 27.6% of amine curing agent, 1.2% of coupling agent, 4.5% of tertiary amine accelerator, 4.8% of toughening agent and 1.9% of fumed silica.

In embodiments 1 to 24, when the non-metallic composite material layer is a glass fiber prepreg, an aramid fiber prepreg, a PP bidirectional prepreg, or a modified carbon fiber prepreg, the method for preparing the light and thin ceramic-glass composite shell of the mobile terminal includes the following steps:

1. processing the ceramic or glass into a finished sheet;

2. coating a buffer layer on the inner surface of the ceramic or glass;

3. preliminarily solidifying the non-metal composite material layer, and aligning the non-metal composite material layer with the ceramic or glass shell through a special fixture;

4. and heating and pressurizing the aligned sample by a vacuum pressing machine, and curing to obtain the light and thin ceramic and glass composite shell of the mobile terminal.

In embodiments 1 to 24, when the non-metallic composite material layer is an epoxy glass fiber board, a kevlar fiber board, a polypropylene fiber board, or polyamide, the method for preparing the light and thin ceramic and glass composite housing for the mobile terminal is the first method or the second method:

the first method comprises the following steps:

1. processing the ceramic or glass into a finished sheet;

2. cutting the non-metal composite material into a proper size, then stamping, profiling and cooling the non-metal composite material to obtain a non-metal composite material layer;

3. and placing the finished ceramic or glass shell on a special jig, coating a buffer layer on the inner surface, aligning the buffer layer with the nonmetal composite material layer, and heating, pressurizing and pressing the buffer layer by a vacuum pressing machine to obtain the light and thin ceramic or glass composite shell of the mobile terminal.

The second method comprises the following steps:

1. roughly processing the ceramic or glass;

3. placing the rough ceramic and glass shell on a special jig, coating a buffer layer on the inner bottom, aligning the rough ceramic and glass shell with the nonmetal composite material layer, and then heating, pressurizing and pressing the rough ceramic and glass shell by a vacuum pressing machine to obtain a blank body of the composite shell;

4. and (3) performing finish machining on the blank of the composite shell sequentially as follows: a. carrying out CNC machining on the inner surface; b. grinding and thinning the ceramic layer or the glass layer; c. and carrying out CNC (computer numerical control) shape processing, rough polishing, punching and fine polishing on the ceramic layer or the glass layer to obtain the light and thin ceramic and glass composite shell of the mobile terminal.

Examples 25 to 30

The structural schematic diagram of the lightweight, thin ceramic and glass composite housing of the mobile terminal in embodiments 25 to 30 is shown in fig. 2, where the lightweight, thin ceramic and glass composite housing of the mobile terminal includes a ceramic layer or a glass layer 4 and a non-metal composite layer 5; the non-metal composite material layer 5 is attached to the inner surface of the ceramic layer or the glass layer 4; the materials, weights and thickness parameters of the ceramic layer, the glass layer, the buffer layer and the non-metal composite material layer are shown in table 1 and table 2, wherein the weight reduction ratio (pure shell mass-light and thin structure mass)/pure shell mass is 100%.

The method for manufacturing the light and thin ceramic and glass composite shell of the mobile terminal in the embodiment 25-30 includes the following steps:

1. processing the ceramic or glass into a finished sheet;

2. preliminarily solidifying the non-metal composite material layer, and aligning the non-metal composite material layer with the ceramic or glass shell through a special fixture;

3. and heating and pressurizing the aligned sample by a vacuum pressing machine, and curing to obtain the light and thin ceramic and glass composite shell of the mobile terminal.

TABLE 1 parameters one of the composite shells described in examples 1-30

As can be seen from table 2, the composite shell of the present invention is effective in weight reduction compared to pure ceramic or glass shells using the same thickness dimension.

TABLE 2 parameters two for the composite shells described in examples 1-30

Example 31

The performance of the light and thin ceramic and glass composite shell of the mobile terminal is tested.

(1) Ball drop test

The test conditions were: ceramic, specification 55 x 55mm, 130g steel ball, bearing object PVC hollow clamp, impacting ceramic plate by freely falling from steel ball with height of 6cm, once every height, rising for 2cm each time until crack appears on ceramic surface; the test results are shown in table 3.

Table 3 ball drop test results

As can be seen from table 3, the impact performance of the composite shell with different thickness is improved to a different extent compared with the pure ceramic shell with the same specific thickness.

(2) Environmental testing

The method comprises a cold and hot impact test, a constant temperature and humidity test, a high and low temperature storage test, a salt spray test, a water boiling test and the like; the specific test conditions were as follows:

a) cold and hot shock test conditions: low temperature of-40 deg.C (1h), and high temperature of 75 deg.C (1h) within 1 min; the number of cycles: 40 cycles (80 h);

b) constant temperature and humidity test conditions: temperature, 75 ℃; humidity, 91% -95%; time 168 h;

c) low temperature storage test conditions: temperature, -40 degrees centigrade; time, 96 h;

d) high temperature storage test conditions: temperature, 75 ℃; time, 96 h;

e) boiling test conditions: water bath at 80 deg.C for 30min, and product can not contact the container wall;

f) salt spray test conditions: temperature, 35 ℃; NaCl concentration, 5%; the pH value is 6.5-7.2; time, 96 h.

g) Aging test conditions: 140 degrees; humidity is 100%; time, 5 h.

And (4) environmental test results: after the above various environmental tests, the bonding interface between the ceramic or glass member and the non-metal composite layer in the composite shell according to embodiments 1 to 30 does not peel.

(3) Drop test

And performing drop tests on the shell after the environment test, including a complete machine drop test, a roller drop test and a sand paper drop test.

1. And (3) complete machine drop test: the falling height is 1.0-1.5 m, and the falling direction is four edges of the periphery of the product and the large surface of the ceramic component;

2. roller drop test: drum height 1.0m, test period 75 cycles, 2 cycles.

3. And (3) abrasive paper drop test: the falling height is 1.0-1.5 m, and the falling direction is the large surface of the ceramic component.

The drop test results are as follows: after a drop test, slight depressions and deformation are formed on the surface of the non-metal composite layer of the composite shell in the embodiment 1-30; however, the bonding interface between the ceramic or glass member and the non-metal composite layer is still firmly bonded, and no peeling phenomenon occurs.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A mobile terminal light and thin ceramic and glass composite shell is characterized by comprising a ceramic layer or a glass layer and a non-metal composite material layer;

2. The thin and light ceramic and glass composite housing for a mobile terminal according to claim 1, wherein the composite housing comprises a rear cover and a middle frame, the outer surface of the rear cover is a ceramic layer or a glass layer, the outer surface of the middle frame is a ceramic layer or a glass layer, and the inner surface of the rear cover and/or the middle frame is provided with a non-metal composite material layer; preferably, the inner surfaces of the back plate rear cover and the middle frame are both provided with non-metal composite material layers.

3. The lightweight thin ceramic-glass composite case for a mobile terminal according to claim 1, wherein the following (a) and/or (B):

(A) the material of the non-metal composite material layer comprises at least one of glass fiber prepreg, aramid fiber prepreg, PP bidirectional prepreg, modified carbon fiber prepreg, epoxy glass fiber board, Kevlar fiber board, polypropylene fiber board and polyamide board;

(B) the buffer layer is made of at least one of epoxy resin glue, acrylate structural glue and modified polyurethane glue; preferably, the material of the buffer layer is epoxy resin glue.

4. The lightweight thin ceramic-glass composite case for a mobile terminal according to claim 3, wherein the epoxy resin adhesive comprises the following components in percentage by weight: 50-90% of resin, 10-50% of curing agent, 0.5-2% of coupling agent, 0.5-5% of accelerator, 2-8% of toughening agent and 0.5-5% of filler; preferably, the resin comprises bisphenol a epoxy resin and bisphenol F epoxy resin; the curing agent comprises an anhydride curing agent and/or an amine curing agent; the accelerator comprises amines and derivatives thereof; the filler comprises fumed silica.

5. The lightweight thin ceramic-glass composite case for a mobile terminal according to claim 1, wherein the thickness of the non-metal composite material layer is less than or equal to 0.5mm, the thickness of the ceramic layer or the glass layer is less than or equal to 1.0mm, and the thickness of the buffer layer is 50-80 μm.

6. The lightweight thin ceramic-glass composite case for a mobile terminal according to claim 1, wherein the method for manufacturing the lightweight thin ceramic-glass composite case for a mobile terminal comprises the following steps: processing the ceramic or glass to a finished product, primarily curing the non-metal composite material, aligning and adhering the non-metal composite material to the inner surface of the ceramic or glass, and finally heating and pressing the non-metal composite material to obtain the composite shell.

7. The lightweight thin ceramic-glass composite case for a mobile terminal according to claim 1, wherein the method for manufacturing the lightweight thin ceramic-glass composite case for a mobile terminal comprises the following steps: processing the ceramic or glass into a finished product, coating a buffer layer material on the inner surface of the ceramic or glass to form a buffer layer, attaching the primarily cured nonmetal composite material on the buffer layer in an aligned manner, and finally heating and pressing to obtain the composite shell.

8. The lightweight thin ceramic-glass composite case for a mobile terminal according to claim 1, wherein the method for manufacturing the lightweight thin ceramic-glass composite case for a mobile terminal comprises the following steps: processing the ceramic or glass into a finished product, coating a buffer layer material on the inner surface of the ceramic or glass to form a buffer layer, stamping and profiling the non-metal composite material, aligning and laminating the non-metal composite material on the buffer layer, and finally heating and laminating to obtain the composite shell.

9. The lightweight thin ceramic-glass composite case for a mobile terminal according to claim 1, wherein the method for manufacturing the lightweight thin ceramic-glass composite case for a mobile terminal comprises the following steps: roughly processing the ceramic or glass, coating a buffer layer material on the inner surface of the roughly processed ceramic or glass to form a buffer layer, punching and profiling the non-metal composite material, aligning and laminating the non-metal composite material on the buffer layer, and heating and laminating to obtain a blank of the composite shell; and carrying out finish machining on the blank of the composite shell to obtain the composite shell.

10. The lightweight thin ceramic-glass composite case for a mobile terminal as claimed in claim 1, wherein the finishing process comprises the following steps in sequence: a. carrying out CNC machining on the inner surface; b. grinding and thinning the ceramic layer or the glass layer; c. and carrying out CNC (computer numerical control) shape processing, rough polishing, punching and fine polishing on the ceramic layer or the glass layer.