CN108409115A - Hot pressing mold for curved glass and its preparation method and application - Google Patents

Abstract

The present invention proposes a hot pressing mold for curved glass and a preparation method thereof, curved glass and electronic equipment. The hot pressing mold for curved glass is formed of a ceramic material, and the ceramic material is selected from oxide ceramics or nitride ceramics. The hot pressing mold proposed by the present invention is formed of oxide ceramics or nitride ceramics, and compared with the existing graphite mold, its surface hardness is higher and the interior is more dense and stable, thereby significantly improving the service life of the hot pressing mold for curved glass and further improving the yield rate of the produced curved glass.

Description

Hot pressing mold for curved glass and its preparation method and application

technical field

The invention relates to the technical field of glass moulds, in particular, the invention relates to a hot-pressing mold for curved glass, a preparation method and application thereof. More specifically, the present invention relates to a hot-pressing mold for curved glass and a preparation method thereof, curved glass and electronic equipment.

Background technique

At present, the hot bending molds used in mobile phone 3D glass can be used directly after being processed by CNC (numerical control machine tool) and polished. Moreover, the hot bending mold made of graphite material is soft (the surface pencil hardness is only 2-3H), and it is easy to be scratched during use, which may easily cause crushing of the product produced by hot pressing; and the hot bending mold of graphite, Oxidation will fall off after a certain number of uses, which will lead to defects in glass products. Therefore, the service life of the current graphite mold is only 800 times.

Therefore, the design of hot pressing molds for curved glass still needs to be improved at this stage.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art to a certain extent.

The present invention has been accomplished based on the following findings of the inventors:

In the course of research, the inventor found that using oxide ceramics or nitride ceramics to replace the existing commonly used graphite materials can increase the service life of hot-pressing molds for curved glass, and can further improve the quality of the produced curved glass Rate.

In view of this, an object of the present invention is to provide a hot pressing mold with high surface hardness, anti-oxidation and anti-shedding surface, or longer service life.

In the first aspect of the present invention, the present invention proposes a hot pressing mold for curved glass.

According to an embodiment of the present invention, the hot pressing mold is formed of a ceramic material selected from oxide ceramics or nitride ceramics.

The inventor unexpectedly found that the hot-pressing mold for curved glass in the embodiment of the present invention is formed of oxide ceramics or nitride ceramics. Compared with existing graphite molds, its surface hardness is higher and its interior is denser Stable, which can significantly improve the service life of the hot-pressing mold used for curved glass, and can further improve the yield rate of the curved glass produced; and, compared with carbide ceramic materials, the sintering of oxide ceramics and nitride ceramics The temperature is lower, the production is easier, and the hardness of nitride ceramics is higher than that of carbide ceramics, less prone to damage, better durability and lower coefficient of friction, which can further reduce the possibility of scratches on curved glass.

In addition, the hot pressing mold according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the hot pressing mold includes: a male die, on which a raised part is arranged, and the raised part includes a plane part and a curved part; a female die, on which a The recessed part is arranged in cooperation with the raised part.

According to an embodiment of the present invention, the surface pencil hardness of the hot pressing mold is not less than 8H.

According to an embodiment of the present invention, the melting point of the ceramic material is higher than 700 degrees Celsius.

According to an embodiment of the present invention, the oxide ceramic includes at least one selected from alumina, zirconia, magnesia and beryllium oxide.

According to an embodiment of the present invention, the nitride ceramic includes at least one selected from silicon nitride, boron nitride, aluminum nitride and titanium nitride.

In a second aspect of the present invention, the present invention proposes a method for preparing a hot pressing mold for curved glass.

According to an embodiment of the present invention, the method includes: providing a precursor powder of an oxide ceramic or a nitride ceramic, and pressing the precursor powder; sintering the pressed blank to obtain a ceramic The green body: processing and polishing the ceramic green body so as to obtain the hot pressing mold.

The inventors unexpectedly found that by adopting the preparation method of the embodiment of the present invention, hot press molds for oxide ceramics or nitride ceramics with higher surface hardness, longer service life and higher product yield can be obtained, and, compared to The preparation of carbide ceramics has lower sintering temperature and simpler process.

In addition, the preparation method according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the surface roughness of the hot pressing mold after the polishing is less than 100 nm.

According to an embodiment of the present invention, the precursor powder of the oxide ceramic includes precursor powder of alumina, zirconia, magnesia or beryllium oxide.

According to an embodiment of the present invention, the precursor powder of the nitride ceramic includes precursor powder of silicon nitride, boron nitride, aluminum nitride or titanium nitride.

In the third aspect of the present invention, the present invention provides a curved glass.

According to an embodiment of the present invention, the curved glass is obtained by using the above-mentioned hot pressing mold.

The inventor unexpectedly found that the curved glass of the embodiment of the present invention has a high yield rate, and because the service life of the hot pressing mold is effectively extended, the production cost of the curved glass can be reduced. Those skilled in the art can understand that the features and advantages described above for the hot-pressing mold for curved glass are still applicable to the curved glass, and will not be repeated here.

In a fourth aspect of the invention, the invention proposes an electronic device.

According to an embodiment of the present invention, the electronic device includes the above-mentioned curved glass.

The inventors unexpectedly found that the curved glass of the electronic device according to the embodiment of the present invention has a higher yield rate and lower manufacturing cost, thereby prolonging the service life of the electronic device, higher yield rate and lower cost. Those skilled in the art can understand that the features and advantages described above for the hot pressing mold for curved glass and the curved glass are still applicable to the electronic device, and will not be repeated here.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the schematic cross-sectional structure diagram of the hot-press mold of an embodiment of the present invention;

Fig. 2 is the top view structural representation of punch and die of an embodiment of the present invention;

Fig. 3 is the punch along AA ' of an embodiment of the present invention and the longitudinal sectional structural representation of die along CC;

Fig. 4 is a schematic cross-sectional structure diagram of a punch along CC and a die along EE according to an embodiment of the present invention;

Fig. 5 is a schematic flowchart of a method for preparing a hot-pressing mold for curved glass according to an embodiment of the present invention.

reference sign

100 hot pressing mold

110 punch

111 convex part

112 cards fast

113 functional holes

120 die

121 depression

122 card slots

Detailed ways

The following describes the embodiments of the present invention in detail, and those skilled in the art will understand that the following embodiments are intended to explain the present invention, and should not be regarded as limiting the present invention. Unless otherwise specified, in the following examples that do not explicitly describe specific techniques or conditions, those skilled in the art can carry out according to commonly used techniques or conditions in this field or according to product instructions.

In one aspect of the present invention, the present invention provides a hot pressing mold for curved glass. Referring to Figures 1-4, the hot pressing mold of the present invention will be described in detail.

According to an embodiment of the present invention, referring to FIG. 1 , the hot pressing mold 100 is formed of a ceramic material, and the ceramic material is selected from oxide ceramics or nitride ceramics.

The inventors of the present invention have found through research that the graphite hot-press molds used in the prior art have a pencil hardness of only 2 to 3H on the surface, which is easily scratched during use and may cause crush damage to the produced curved glass, and The surface of graphite will oxidize and fall off after a period of use, which will lead to defects in glass products. At the same time, the service life of graphite molds is only 800 times.

Therefore, the inventor replaced the graphite material of the hot-pressing mold with oxide ceramics or nitride ceramics, which can significantly improve the surface hardness of the hot-pressing mold, which is not easy to be scratched during use, and the oxide ceramics or nitrides Ceramics are denser and more stable without oxidizing and falling off, thereby increasing the service life of the hot pressing mold and increasing the yield rate of the curved glass produced.

According to an embodiment of the present invention, the surface pencil hardness of the hot pressing mold 100 is not less than 8H. In this way, the graphite material commonly used in the hot pressing mold is replaced with oxide ceramics or nitride ceramics, and the surface pencil hardness of the hot pressing mold 100 can be reduced from 3H is increased to 8H, which can effectively increase the yield rate of the manufactured curved glass, and increase the service life of the hot pressing mold 100 from 800 times to 5000 times, thereby reducing the production cost of the curved glass. According to the embodiment of the present invention, the melting point of the ceramic material should be higher than 700 degrees Celsius, so that the temperature requirements for making curved glass and the surface shape requirements of the working surface of the hot-pressing mold can be met, thereby further ensuring the yield of the curved glass produced.

According to the embodiment of the present invention, the specific type of oxide ceramics is not particularly limited, as long as the surface pencil hardness of this type of oxide ceramics is not less than 8H and the melting point is higher than 700 degrees Celsius, those skilled in the art can make according to needs The specific process conditions of the curved glass can be carried out accordingly. In some embodiments of the present invention, the oxide ceramics may include at least one selected from alumina (Al ₂ O ₃ ), zirconia (ZrO ₂ ), magnesium oxide (MgO) and beryllium oxide (B ₂ O) , so, by the above-mentioned kind of oxide ceramics, the surface pencil hardness of the hot-pressing mold formed by it can be increased to more than 8H, thereby can significantly prevent the surface scratch resistance of the hot-pressing mold, and, with respect to carbide ceramics, The sintering process of the above-mentioned kinds of oxide ceramics is simpler.

According to the embodiment of the present invention, the specific type of nitride ceramics is not particularly limited, as long as the surface pencil hardness of this type of nitride ceramics is not less than 8H and the melting point is higher than 700 degrees Celsius, those skilled in the art can make according to needs The specific process conditions of the curved glass can be carried out accordingly. In some embodiments of the present invention, the nitride ceramic may include at least one selected from silicon nitride (Si ₃ N ₄ ), boron nitride (BN), aluminum nitride (AlN) and titanium nitride (TiN) Kind, like this, by above-mentioned nitride ceramics, the surface pencil hardness of the hot-press mold that it forms can be improved to more than 8H, thereby can prevent the surface scratch resistance of hot-press mold significantly, and, with respect to carbide ceramics The sintering temperature of the above-mentioned types of nitride ceramics is lower, the surface hardness is higher and the coefficient of friction is lower, so that the production yield of curved glass can be further improved.

According to the embodiment of the present invention, the specific shape of the hot-pressing mold 100 is not particularly limited, and those skilled in the art can design accordingly according to the specific shape of the curved glass to be produced by the hot-pressing mold. In some embodiments of the present invention, referring to FIGS. 2-4 , the hot pressing mold 100 (not shown in the figures) may include a male die 110 and a female die 120, wherein the male die 110 is provided with a raised portion 111, and The protruding part 111 includes a plane part and a curved part, the curved part surrounds the plane part, and the concave part 121 is provided on the die 120, and the concave part 121 and the protruding part 111 are arranged in cooperation. It should be noted that the "cooperating arrangement" herein specifically refers to the matching of the specific shape and position of the raised portion 111 and the specific shape and position of the recessed portion 121 so as to form a cavity for the curved glass to be formed.

In summary, according to the embodiments of the present invention, the present invention proposes a hot pressing mold for curved glass, which is formed of oxide ceramics or nitride ceramics. Compared with the existing graphite molds, the surface Higher hardness, denser and more stable inside, which can significantly improve the service life of hot-pressing molds for curved glass, and further improve the yield of curved glass produced; and, compared with carbide ceramic materials, oxide The sintering temperature of ceramics and nitride ceramics is lower, and the production is easier, and the hardness of nitride ceramics is higher than that of carbide ceramics, less prone to damage, better durability and lower coefficient of friction, which can further reduce scratches on curved glass possibility of injury.

In another aspect of the present invention, the present invention provides a method for preparing a hot-press mold for curved glass. According to an embodiment of the present invention, with reference to Fig. 5, the preparation method includes:

S100: Provide the precursor powder of oxide ceramics or nitride ceramics, and press the precursor powder into shape.

In this step, precursor powder of oxide ceramics or nitride ceramics is provided, and the precursor powder is pressed into shape.

According to an embodiment of the present invention, the precursor powder of oxide ceramics may include precursor powders of alumina, zirconia, magnesia or beryllium oxide, so that a hot-press mold of oxide ceramics with higher surface hardness can be finally obtained. According to an embodiment of the present invention, the precursor powder of nitride ceramics may include the precursor powder of silicon nitride, boron nitride, aluminum nitride or titanium nitride, so that a higher surface hardness and a lower friction coefficient can be finally obtained. Nitride ceramic hot pressing mold.

According to the embodiment of the present invention, the process parameters of press molding, such as press temperature, time, etc., are not particularly limited, and those skilled in the art can design and adjust accordingly according to the specific type of precursor powder, which is not described here. Let me repeat.

S200: Sintering the pressed blank to obtain a ceramic blank.

In this step, the blank formed by pressing in step S100 is sintered so as to obtain a ceramic green body.

According to the embodiment of the present invention, the process parameters of the sintering treatment, such as pressing temperature, time, etc., are not particularly limited, and those skilled in the art can design and adjust accordingly according to the specific type of ceramic material, which will not be repeated here. repeat.

S300: Processing and polishing the ceramic body so as to obtain a hot pressing mold.

In this step, the ceramic body obtained in step S200 is processed and polished so as to obtain a hot pressing mold.

According to the embodiments of the present invention, the specific method of processing is not particularly limited, such as CNC (numerical control machine tool), etc., those skilled in the art can select accordingly according to the specific hardness and processing characteristics of the ceramic material, here No longer.

According to the embodiment of the present invention, the surface roughness of the hot pressing mold 100 after polishing is less than 100nm, so that the surface of the hot pressing mold is less likely to be scratched, and the yield rate of the manufactured curved glass can be improved.

In summary, according to the embodiments of the present invention, the present invention proposes a method for preparing a hot-pressing mold for curved glass, which can obtain an oxidation mold with higher surface hardness, longer service life and higher product yield. Compared with the preparation of carbide ceramics, the sintering temperature of this preparation method is lower and the process is simpler.

In another aspect of the invention, the invention provides a curved glass. According to an embodiment of the present invention, the curved glass is obtained by using the above-mentioned hot pressing mold.

According to the embodiment of the present invention, the specific type of the curved glass is not particularly limited, such as the glass front cover of the mobile phone, the glass rear cover of the mobile phone, etc., and those skilled in the art can design correspondingly according to the actual use of the curved glass , which will not be repeated here.

To sum up, according to the embodiments of the present invention, the present invention proposes a curved glass with a high yield rate, and since the service life of the hot-pressing mold is effectively extended, the manufacturing cost of the curved glass can be reduced. Those skilled in the art can understand that the features and advantages described above with respect to the hot pressing mold are still applicable to the curved glass, and will not be repeated here.

In another aspect of the invention, the invention provides an electronic device. According to an embodiment of the present invention, the electronic device includes the above-mentioned curved glass.

According to the embodiment of the present invention, the specific type of the electronic device is not particularly limited, such as mobile phones, tablet computers, wearable devices, etc., and the types of electronic devices commonly used in the field with curved glass can be used. Personnel can make a corresponding selection according to the actual use environment of the electronic device, which will not be repeated here.

It should be noted that in addition to the curved glass, the electronic device also includes other necessary components and parts. Taking a mobile phone as an example, such as a casing, a display touch panel, a circuit board, a battery, etc., those skilled in the art can according to The specific type of the electronic device is designed and supplemented accordingly, and will not be repeated here.

To sum up, according to the embodiments of the present invention, the present invention proposes an electronic device, the yield rate of the curved glass is higher and the production cost is lower, so that the service life of the electronic device can be extended and the yield rate is higher And the cost is lower. Those skilled in the art can understand that the features and advantages described above for the curved glass are still applicable to the electronic device, and will not be repeated here.

The present invention will be described below with reference to specific embodiments. It should be noted that these embodiments are only illustrative and do not limit the present invention in any way.

Example 1

In this example, a hot press mold of alumina (Al ₂ O ₃ ) ceramics was fabricated. Wherein, the specific shape of the hot-pressing mold refers to Figures 2-4; the precursor powder is the precursor powder of alumina ceramics, and the sintering temperature is 1650-1990 degrees Celsius.

Example 2

In this example, a hot press mold of silicon nitride (Si ₃ N ₄ ) ceramics was manufactured in the same manner as in Example 1. The difference is that in this embodiment, the precursor powder is the precursor powder of silicon nitride, and the sintering temperature is 1700-1800 degrees Celsius.

Comparative example 1

In this comparative example, a hot press mold for silicon carbide (SiC) ceramics was produced in substantially the same manner as in Example 1. The difference is that in this embodiment, the precursor powder is silicon carbide precursor powder, and the sintering temperature is 2000-2300 degrees Celsius.

Example 3

In this embodiment, the surface pencil hardness and the coefficient of friction are tested respectively for the alumina ceramic hot-press mold of embodiment 1, the silicon nitride ceramic hot-press mold of embodiment 2, and the silicon carbide ceramic hot-press mold of comparative example 1. test.

The test results of the surface pencil hardness and friction coefficient of this embodiment show that the surface pencil hardness of alumina ceramics and silicon nitride ceramics is relatively high, and the friction coefficient of silicon nitride ceramics is relatively low, and is higher than that of silicon carbide ceramics. lower.

Summarize

Combining Examples 1-3 and Comparative Example 1, it can be concluded that the hot-pressing mold for curved glass proposed by the present invention is formed of oxide ceramics or nitride ceramics, with higher surface hardness and denser and more stable interior. , so that the service life of the hot-pressing mold for curved glass can be significantly improved, and the yield rate of the curved glass can be further improved; and, compared with carbide ceramic materials, the sintering temperature of oxide ceramics and nitride ceramics It is lower and easier to manufacture, and the hardness of nitride ceramics is higher than that of carbide ceramics, less prone to damage, better durability and lower coefficient of friction, which can further reduce the possibility of scratches on curved glass.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and therefore should not be construed as limitations on the invention.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (12)

1. a kind of hot pressing die for bend glass, which is characterized in that the hot pressing die is formed by ceramic material, institute It states ceramic material and is selected from oxide ceramics or nitride ceramics.

2. hot pressing die according to claim 1, which is characterized in that the hot pressing die includes：

Punch-pin is provided with lug boss on the punch-pin, and the lug boss includes planar section and curvature portion；

Cavity plate, recessed portion is provided on the cavity plate, and the recessed portion is arranged with the raised portion fits.

3. hot pressing die according to claim 1, which is characterized in that the surface pencil hardness of the hot pressing die is not less than 8H。

4. hot pressing die according to claim 1, which is characterized in that the fusing point of the ceramic material is higher than 700 degrees Celsius.

5. hot pressing die according to claim 1, which is characterized in that the oxide ceramics includes selected from aluminium oxide, oxygen Change at least one of zirconium, magnesia and beryllium oxide.

6. hot pressing die according to claim 1, which is characterized in that the nitride ceramics includes selected from silicon nitride, nitrogen Change at least one of boron, aluminium nitride and titanium nitride.

7. a kind of method preparing the hot pressing die for bend glass, which is characterized in that including：

There is provided the precursor powder of oxide ceramics or nitride ceramics, and by the precursor powder compression moulding；

The blank of the compression moulding is sintered, to obtain ceramic idiosome；

The ceramic idiosome is processed and is polished, to obtain the hot pressing die.

8. the method according to the description of claim 7 is characterized in that the surface roughness of the hot pressing die after the polishing Less than 100nm.

9. the method according to the description of claim 7 is characterized in that the precursor powder of the oxide ceramics includes oxidation The precursor powder of aluminium, zirconium oxide, magnesia or beryllium oxide.

10. the method according to the description of claim 7 is characterized in that the precursor powder of the nitride ceramics includes nitridation The precursor powder of silicon, boron nitride, aluminium nitride or titanium nitride.

11. a kind of bend glass, which is characterized in that obtained by using hot pressing die according to any one of claims 1 to 6 's.

12. a kind of electronic equipment, including the bend glass described in claim 11.