WO2020200174A1

WO2020200174A1 - Method and system for preparing curved glass sheet, glass cover plate and electronic device

Info

Publication number: WO2020200174A1
Application number: PCT/CN2020/082154
Authority: WO
Inventors: 丁名区
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-04-01
Filing date: 2020-03-30
Publication date: 2020-10-08
Also published as: CN110002728B; CN110002728A

Abstract

Provided are a method and a system for preparing a curved glass sheet, a glass cover plate, and an electronic device. Said method comprises: placing a planar glass preform plate in a molding die and fixing same, a sealed first cavity being formed between a first mold and the glass preform plate, and a sealed second cavity being formed between a second mold and the glass preform plate; introducing a molding medium into the first cavity and the second cavity, and maintaining the pressure in the first cavity to match the pressure in the second cavity, and heating the glass preform plate; and forming a pressure difference between the first cavity and the second cavity, so that the glass preform plate is adhered to the second mold, so as to form a curved glass sheet.

Description

Method and system for preparing curved glass plate, glass cover plate and electronic equipment

Technical field

This application relates to the field of electronic equipment, in particular to a method and system for preparing curved glass plates, glass cover plates and electronic equipment.

Background technique

Current curved glass plates, especially curved glass plates used to prepare cover plates (TP cover plates and battery covers) of electronic devices such as mobile phones, are mostly formed by a flat plate through a forming process such as hot bending. At present, most of the methods for forming curved glass sheets are by bending with a rigid graphite mold under hot conditions, or by vacuuming on one side in the mold and forming by atmospheric pressure.

The current method and system for preparing curved glass plates, glass cover plates and electronic equipment still need to be improved.

Summary of the invention

This application aims to alleviate or even solve at least one of the following technical problems to a certain extent:

In one aspect of this application, this application proposes a method for preparing curved glass plates. The method includes: placing and fixing a flat glass preform in a forming mold, the forming mold including a first mold and a second mold, and a sealed first cavity is formed between the first mold and the glass preform. A sealed second cavity is formed between the second mold and the glass preform, and the second mold has a curved surface on the side facing the second cavity, or the first mold The side facing the first cavity has a curved surface; the molding medium is introduced into the first cavity and the second cavity, and the pressure in the first cavity and the The pressure in the second cavity is matched to heat the glass prefabricated plate; a pressure difference is formed between the first cavity and the second cavity to make the glass prefabricated plate and the second The mold or the first mold is attached to form the curved glass sheet. This method realizes the forming of curved glass through the pressure difference of the forming medium on both sides of the glass prefabricated plate under hot conditions. Therefore, the vacuum degree on both sides of the prefabricated plate can be accurately controlled during the molding process, and a uniformly deformed curved surface can be obtained. Glass plates. Moreover, this method uses the medium pressure on both sides to achieve molding, so the requirements for the molding die are also lower. Compared with the single-side pressure molding method, the process of controlling the vacuum degree is simpler, which is beneficial to reduce the use of this method to prepare The production cost of curved glass sheets.

In another aspect of this application, this application proposes a system for preparing curved glass sheets. The system includes: a forming mold, the forming mold includes a first mold and a second mold, the second mold has a curved surface on the side facing the first mold or the first mold faces the second mold One side of the mold has a curved surface, the first mold and the second mold each have a molding medium supply channel communicating with the molding space, and the first mold has a side facing the molding space A first sample fixing part, the side of the second mold facing the molding space has a second sample fixing part, the first sample fixing part and the second sample fixing part can be inside the molding space A sample fixing plane is defined, a first cavity is provided between the first mold and the sample fixing plane, and a second cavity is provided between the second mold and the sample fixing plane; a molding medium supply unit, so The molding medium supply unit is connected to the first mold and the second mold respectively; and a heating unit is connected to at least one of the molding medium supply unit and the molding mold. This system can use the forming medium passed into the first cavity and the second cavity to realize the preparation of curved glass sheets, so the requirements for the forming mold are lower, and compared with the hot press forming with only one-sided cavity, There is no need for complicated processes for controlling the vacuum degree. Therefore, it is beneficial to reduce the production cost of using the system to prepare curved glass plates.

In another aspect of this application, this application proposes a glass cover plate. The glass cover plate includes a curved glass plate that is supported by the aforementioned method or is prepared by the aforementioned system. Therefore, the glass cover plate at least has all the features and advantages of the curved glass plate prepared by the aforementioned method or system, and will not be repeated here. In general, the glass cover plate has at least one of the advantages of low production cost, good molding accuracy, fewer defects such as orange lines, unevenness and indentation, and good mechanical properties.

In another aspect of this application, this application proposes an electronic device. The electronic device includes: a housing, the housing includes the aforementioned glass cover; a display screen, a battery, and a main board, the battery is electrically connected to the main board and the display screen, and the battery and the At least one of the main boards is located in the housing. Therefore, the electronic device has at least all the features and advantages of the aforementioned glass cover, which will not be repeated here. In general, the electronic device has at least one of the advantages of better cover molding accuracy, less defects such as orange lines, unevenness and indentation, and good mechanical properties of the electronic device housing.

Description of the drawings

Figure 1 shows a schematic flow chart of a method for preparing a curved glass sheet according to an example of the present application;

Figure 2 shows a schematic structural diagram of a system for preparing curved glass sheets according to an example of the present application;

Figure 3 shows a schematic diagram of a part of the process of preparing a curved glass sheet according to an example of the present application;

Fig. 4 shows a schematic diagram of a part of the process of a method for preparing a curved glass sheet according to an example of the present application;

Fig. 5 shows a schematic diagram of a part of the process of a method for preparing a curved glass sheet according to an example of the present application;

Fig. 6 shows a schematic structural diagram of a second mold according to an example of the present application;

Fig. 7 shows a schematic diagram of pressure change curves in the first cavity and the second cavity according to an example of the present application;

Fig. 8 shows a partial schematic diagram of a method for preparing a curved glass sheet according to an example of the present application;

Figure 9 shows a top view of a second mold according to an example of the present application;

Figure 10 shows a top view of a second mold according to an example of the present application;

Fig. 11 shows a schematic structural diagram of an electronic device according to an example of the present application;

Fig. 12 shows a schematic structural diagram of a housing of an electronic device according to an example of the present application.

Description of reference signs:

110: first mold; 10: first sample fixing part; 120: second mold; 20: second sample fixing part; 12A: bottom mold; 12B: lateral parting; 11: molding medium supply channel; 130: First cavity; 140: Second cavity; 150: Sample fixing plane; 200: Forming medium supply unit; 300: Heating unit; 500: Glass prefabricated plate; 1000: Curved glass plate; 2000: Electronic equipment; 2100: Shell Body; 21: back cover part; 22: side frame part.

detailed description

The examples of the present application are described in detail below, and the examples of the examples are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The examples described below with reference to the accompanying drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation to the present application.

In one aspect of this application, this application proposes a method for preparing curved glass plates. Under hot conditions, the pressure difference of the molding medium is formed on the two sides of the glass preform, and the pressure difference of the molding medium is controlled to realize the molding of curved glass. Therefore, the vacuum degree on both sides of the preform can be accurately controlled during the molding process. A curved glass sheet with uniform deformation can be obtained. Moreover, this method utilizes the pressure of the media on both sides of the plate to achieve molding, so the requirements for the molding die are also lower. Compared with the single-side pressure forming method, the process of controlling the vacuum degree is also simpler, which is beneficial to reduce the production cost of using the method to prepare curved glass sheets. Referring to Figure 1, the method may include:

S100: Place the flat glass prefabricated plate in the forming mold and fix it

In this step, the flat glass preform is placed in the forming mold and fixed. The forming mold may include a first mold and a second mold, both of which may define a forming space for placing the glass preform. A closed first cavity can be formed between the surface of the first mold facing the molding space and the surface of the glass preform, and the second mold may be between the surface facing the molding space and the surface on the other side of the glass preform. A closed second cavity is formed. The first cavity and the second cavity are used for accommodating the molding medium passed into the molding space in a subsequent step. Therefore, the pressure difference formed by the forming medium on both sides of the glass preform can be used to realize the precise controllability of the bending and forming process of the glass preform.

Those skilled in the art can understand that the method prepares a curved glass sheet with a curved surface. Therefore, the inner surface of at least one of the first mold and the second mold (the surface facing the molding space) needs to have a curved surface. surface. In this application, the first mold and the second mold are only used to distinguish the two sub-molds of the molding mold, and cannot be understood as a limitation on the molding mold or a difference in importance between the two. One of the inner surface of the first mold and the inner surface of the second mold is consistent with the surface shape of the finally obtained curved glass sheet. In other words, the inner surface of one of the first mold and the second mold is used to shape the appearance of the curved glass sheet, and it may be the first mold or the second mold. The method will be explained in detail by taking the same shape of the inner surface of the second mold and the curved glass sheet as an example. In other words, the side of the second mold facing the first mold has a curved surface, and the curved surface has the same shape as the surface of the prepared curved glass sheet.

In order to facilitate understanding, the following briefly describes the forming molds used in the preparation of curved glass sheets by this method. Referring to FIG. 2, the method can be implemented by the system shown in FIG. 2 to realize the preparation of curved glass sheets. The first mold 110 and the second mold 120 are matched, and the first sample fixing part 10 in the first mold 110 and the second sample fixing part 20 in the second mold 120 can define a glass preform for preventing flatness. The sample fixing plane of the plate (shown by the dotted line in the figure). This position is the fixed position of the glass prefabricated plate. A first cavity 130 is provided between the first mold 110 and the sample fixing plane, and a second cavity 140 is provided between the second mold 120 and the sample fixing plane. Both the first mold and the second mold have molding medium supply channels 11 (11A and 11B as shown in the figure). The molding medium supply channel 11 is connected to the molding medium supply unit 200, and is configured with a heating unit 300 to provide thermal conditions in the subsequent process to deform the glass preform.

S200: Inject the molding medium, keep the pressure on both sides of the glass prefabricated plate matched and heat it

In this step, the molding medium is introduced into the first cavity and the second cavity, and the pressure in the first cavity is maintained to match the pressure in the second cavity, and the glass preform is heated. For example, control the pressure in the first cavity to be equal to the pressure in the second cavity. Referring to (a) in FIG. 4, the molding medium can be supplied into the first cavity and the second cavity through the molding medium channels in the first mold 110 and the second mold 120. By separately adjusting the amount of molding medium supplied to the two cavities, the pressure (direction shown by the arrow in the figure) on the surfaces on both sides of the glass preform 500 is equal. As a result, the glass preform can be heated to the forming temperature under the same pressure on both sides to prevent uncontrollable deformation of the glass preform.

In this step, the molding medium injected into the molding space may be heated, and then the glass preformed plate is heated by the molding medium. Alternatively, the forming mold may be heated to heat the glass prefabricated plate fixed inside the forming mold. In general, in this step, the pressure in the first cavity and the second cavity is adjusted by separately controlling the amount of the molding medium passed into the first cavity and the second cavity. Before the glass prefabricated plate is heated to be softened for the hot bending operation, it is ensured that there is no pressure difference between the two sides of the glass prefabricated plate (the side facing the first cavity and the side facing the second cavity). It should be noted that expressions such as "no pressure difference", "pressure matching", and "pressure on both sides are equal" all mean that the pressure difference on both sides of the glass prefabricated plate is small or even zero, which is not enough to cause the glass prefabricated plate to occur. Deformation that affects subsequent mechanical properties.

In this step, the molding medium passed into the first cavity and the molding medium passed into the second cavity may be the same or different. In some examples of this application, the forming medium is only used to provide pressure on both sides of the glass preform. At this time, the specific components of the forming medium will not affect the finally obtained curved glass sheet. In some examples of the present application, the molding medium passed into the first cavity may have the same chemical composition as the molding medium passed into the second cavity. Molding media with the same chemical composition have the same volume under the same substance or the same mass, and the volume is also affected by the same temperature. Therefore, the first cavity and the second cavity can be controlled simply by adjusting the volume and quality of the molding media. The pressure difference between the two cavities without additional conversion.

In this step, the molding medium may be preheated to the molding temperature of the glass preform, and then passed into the first cavity and the second cavity. At this time, a molding medium can be used to heat the glass preform. For example, the molding temperature of the glass prefabricated plate can be determined first according to the composition of the glass prefabricated plate. Subsequently, the molding medium is heated to the molding temperature, and then passed into the first cavity and the second cavity, and the temperature of the molding medium passed into the first cavity and the second cavity is ensured to be consistent. Therefore, it can be ensured that the glass preform fixed in the forming mold can be uniformly heated to its forming temperature.

In some examples of the present application, the molding medium passing into the molding space may also be a chemical reagent with a certain function. For example, it may be a glass strengthening medium capable of strengthening a glass preform. As a result, the thermal bending and strengthening of the glass prefabricated plate can be performed simultaneously, which is beneficial to saving man-hours for subsequent strengthening treatment. When the molding medium is a glass strengthening medium, it is necessary to refer to the temperature of the glass strengthening medium for strengthening treatment and the molding temperature of the glass preform to determine the temperature at which the glass strengthening medium is heated. When the temperature of the strengthening treatment is lower than the molding temperature, the strengthening treatment is required first. Specifically, the strengthening medium can be passed into the first cavity and the second cavity, and the amount of the strengthening medium passed through can be controlled, so that the pressure in the first cavity and the second cavity (or the glass preform The pressure on the surfaces on both sides) match. Subsequently, the first molding die and the second molding die are heated so that the strengthening medium in the molding space reaches the strengthening temperature. The temperature is maintained for a certain period of time to complete the strengthening treatment. After the strengthening treatment is completed, the heating temperature of the mold can be adjusted to make the glass preform in the mold reach above the softening temperature.

S300: A pressure difference is formed on both sides of the glass prefabricated plate to make the glass prefabricated plate fit the second mold

In this step, a pressure difference is formed between the first cavity and the second cavity, so that the glass prefabricated plate is attached to the second mold to form a curved glass plate.

Specifically, in this step, after the glass preform reaches the softening temperature, the amount of molding medium passing into the first cavity and the second cavity is adjusted to form between the first cavity and the second cavity. Pressure difference. Referring to (b) and (c) in FIG. 4, when a pressure difference is formed between the first cavity and the second cavity, the glass preform 500 that reaches the softening temperature can be deformed under the pressure and move toward The side with lower pressure is bent, that is, it is bent toward the side of the second mold 120 until it fits with the second mold 120. In this way, the curved surface of the inner surface of the second mold 120 can be used to realize the hot bending of the glass preform 500. In this step, the bending of the glass preform 500 toward the second mold 120 is controlled by the pressure difference between the first cavity and the second cavity. Therefore, it can be adjusted to be supplied to the first cavity. The amount of medium and the amount of molding medium supplied to the second cavity regulate the pressure difference. Compared with the forming process of one-sided bending under pressure, the process of pressing on both sides can control the pressure difference more accurately on the one hand, and reduce the risk of excessive local thinning of the glass prefabricated plate 500. On the other hand, it can be ensured that during the bending process of the prefabricated glass plate 500, both sides of the glass sheet are subjected to a compressive stress perpendicular to the surface, so that cracks are not likely to occur during the deformation process.

According to some specific examples of the present application, after a pressure difference is formed between the first cavity and the second cavity, the pressure difference can also be kept constant until the glass preform and the second mold are completely bonded. The specific value of the pressure difference in this step is not particularly limited, and those skilled in the art can determine it according to the thickness, specific composition, and the angle of the curved surface after forming (the curved angle of the inner surface of the second mold 120) of the glass preform. Specifically, the pressure difference in this step may be 0.5 MPa to 4 MPa. For example, it can be 0.5 to 2.5 MPa, such as 1 MPa or 1.5 MPa. When the pressure difference is within the above range, the softened glass preform can be better attached to the surface of the second mold 120, and the deformation process will not be difficult to control due to the excessive pressure difference.

The specific method of forming the pressure difference between the first cavity and the second cavity is not particularly limited. For example, it may be by increasing the pressure on the first cavity side to keep the pressure on the second cavity side constant. change. Alternatively, it is also possible to increase the pressure of the first cavity while reducing the pressure on the side of the second cavity. As long as it can be ensured that the pressure on the side of the first cavity is relatively large and the pressure on the side of the second cavity is relatively small, so as to make the glass prefabricated plate bend toward the side of the second cavity. After the pressure difference is formed, the pressure difference can remain unchanged or change during the process of attaching the glass prefabricated plate to the second mold. The pressure difference can be maintained at a constant value until the glass prefabricated plate bends and fits on the second mold, or the pressure difference can also gradually increase or decrease. For example, when the pressure difference changes, the value of the pressure difference may increase or decrease at a constant speed. Or, taking gradually increasing the pressure difference as an example, you can first increase the pressure difference at a faster speed, and then increase the value of the pressure difference at a lower speed at a uniform speed until the glass preform and the second mold fit. Specifically, when the value of the pressure difference is 0, the value of the pressure difference can be changed at a faster speed. For example, the pressure on the side of the first cavity and the second cavity can be adjusted to change the value of the pressure difference from 0 becomes 0.5MPa. Subsequently, the value of the pressure difference can be increased by a larger increase, for example, it can be directly increased from 0.5 MPa to 1 MPa. When the value of the pressure difference, or the adjusted value of the pressure difference is greater than or equal to 1MPa, the increase in the pressure difference can be reduced to prevent the impact on the glass prefabricated plate. For example, every time the value of the pressure difference is changed, the change in the pressure difference may not exceed 0.1 MPa. Therefore, the pressure difference can be adjusted accurately and controllable according to the specific conditions of the curved surface of the second mold, so as to control the hot bending process of the prefabricated glass plate.

After the glass prefabricated plate is fully attached to the second mold, the hot bending process of the glass prefabricated plate can be completed after holding for a period of time, and then the mold is opened and taken out to obtain a curved glass plate. Specifically, since the aforementioned bending process is performed under heating conditions, the heating can be stopped first, the mold is allowed to cool, and the molding medium inside the mold is discharged (refer to (d) in Figure 5), and the pressure inside the mold is restored to atmospheric pressure , Open the closed first mold 110 and the second mold 120 (refer to (e) in FIG. 5), and then the prepared curved glass sheet 1000 can be taken out.

Fig. 7 shows the curves of the pressure in the first cavity (P ₁ ) and the pressure in the second cavity (P ₂ ) over time during the preparation process according to some specific examples of the present application. During the period from 0 to t ₁ , the molding medium is gradually introduced into the first cavity and the second cavity. At this time, the pressure in the two cavities gradually increases, but there is no pressure difference between the two sides during the process (P ₁ =P ₂ ), until the glass preform reaches the forming temperature. Subsequently, during the period from t ₁ to t ₂ , a pressure difference can be formed on both sides of the glass prefabricated plate. For example, the pressure in the first cavity can be reduced, and the pressure in the second cavity can be increased, so as A pressure difference of ΔP is formed between the cavities and the value of the pressure difference is kept constant, so that the softened glass preform gradually approaches the second mold until it is fully fitted and maintained for a period of time. Subsequently, the mold is cooled to room temperature and the molding medium in the molding space is released to restore the pressure in the mold to atmospheric pressure. The process may be to reduce the pressure in the first cavity and the second cavity at the same rate at a uniform speed. As a result, it is possible to avoid excessive pressure changes in the process of releasing the molding medium and damage the curved glass sheet.

The method described in the present application realizes the hot bending process of the glass prefabricated plate based on the pressure regulation of the forming medium on both sides of the mold. Therefore, the curved glass sheet with a larger curved surface bending angle can be prepared. In addition, the friction between the fluid molding medium and the glass prefabricated plate is relatively small, so that a more uniform deformation can occur during the hot bending process, thereby ensuring that the large-angle curved surface can also have a relatively uniform wall thickness.

In some examples of the present application, the second mold may also include a bottom mold, and a lateral parting mold that surrounds the bottom mold and can slide in a direction parallel to the bottom mold. At this time, the second mold may have the shape shown in FIG. 9 and FIG. Structure shown. As shown in Figure 8(d), when the first mold 110 and the second mold 120 are opened and closed, the side parting mold can be slid toward the side away from the molding space, and the curved glass sheet 1000 and the side Make a certain space between the parting mold 12B and the bottom mold 12A. Thus, the curved glass sheet can be easily taken out. Especially when the curved glass sheet 1000 has a curved curved surface with a larger angle, this step can easily take out the formed curved glass sheet.

In summary, the method proposed in this application can have at least one of the following advantages:

Using the forming medium to achieve hot bending, and then a flexible first mold can be used to reduce the friction between the mold and the glass, improve the surface quality of the glass sheet, and reduce the cost of the mold;

The molding space is filled with strengthening medium to form a seal to avoid the influence of external air on the glass and mold;

The deformation rate is controllable, and the control can be achieved by controlling the pressure difference on both sides, reducing the risk of excessive thinning of the glass sheet;

The forming medium can be used for heating, the glass is heated evenly and the deformation is coordinated;

The strengthening and hot bending of the glass can be realized simultaneously, the manufacturing process is shortened, the production efficiency is high, and the strengthening treatment can be carried out under certain pressure conditions, which can improve the efficiency and effect of strengthening;

The glass plate is subjected to compressive stress perpendicular to the surface during the deformation process, and it is not easy to break during the deformation process;

The forming surface of the first mold does not affect the morphology of the plate and does not require precise processing, which can reduce mold costs;

Throughout the forming and cooling process, the glass sheet is not in contact with the air to prevent chemical reactions between the air and the glass sheet and affect the quality of the glass sheet.

In another aspect of this application, this application proposes a system for preparing curved glass sheets. Referring to FIG. 2, the system includes: a molding die, a molding medium supply unit 200 and a heating unit 300. The molding mold includes a first mold 110 and a second mold 120 that can define a closed molding space. The molding medium supply unit 200 is connected to the first mold 110 and the second mold 120, respectively. The heating unit 300 is connected to the molding medium supply unit 200 and the molding At least one of the molds is connected to heat at least one of the molding medium and the molding mold to achieve hot bending of the sample. The system can use the method described above to prepare curved glass plates, and has at least one of the advantages of low mold cost, simple processing technology, realization of large-angle curved glass plates, uniform deformation of the formed glass plates, and better mechanical properties. .

Specifically, the side of the second mold facing the first mold may have a curved surface, so that the shaped glass plate also has a curved surface. Similar to the situation described above, here the first mold and the second mold are only used to distinguish the two parts of the forming mold. The curved surface used to form the curved surface of the curved glass sheet can be located on the second mold or It can be located on the first mold. The following only takes the curved surface on the second mold as an example to describe the system according to the present application in detail.

Both the first mold 110 and the second mold 120 have molding medium supply channels (11A and 11B shown in the figure) communicating with the molding space 200. The first mold 110 has a first sample fixing portion 10 on the side facing the molding space, and the second mold has a second sample fixing portion 20 on the side facing the molding space. The first sample fixing portion 10 and the second sample fixing portion 20 can define a sample fixing plane (a position shown by a dotted line in the figure) inside the molding space. A first cavity 130 is provided between the first mold 110 and the sample fixing plane, and a second cavity 140 is provided between the second mold 120 and the sample fixing plane. The first cavity 130 and the second cavity 140 can be used to accommodate the molding medium passing into the molding space. This system can use the forming medium passed into the first cavity and the second cavity to realize the preparation of curved glass sheets, so the requirements for the forming mold are lower, and compared with the hot press forming with only one-sided cavity, There is no need for complicated processes for controlling the vacuum degree. Therefore, it is beneficial to reduce the production cost of using the system to prepare curved glass plates.

In this application, the specific shape of the fixing portion is not particularly limited, and those skilled in the art can make a selection according to actual conditions. For example, it can be designed according to the specific shapes of the first mold 110 and the second mold 120, as long as the flat glass preform can be fixed between the first mold 110 and the second mold 120, and the glass preform is placed on both sides of the glass preform. It suffices to reserve cavities (the first cavity 130 and the second cavity 140) for accommodating the molding medium. For example, referring to FIG. 6, taking the second mold 120 as an example, the second fixing portion 20 may be the part where the second mold 120 contacts the first mold 110, and the second mold 120 may have a distance away from the first mold 110 (not shown in the figure). Out) A concave shape with one side curved to form a curved surface of a curved glass sheet. The second fixing portion 20 may be formed around the side wall of the recessed portion, so that a flat glass sheet can be sandwiched between two molds (as shown in the figure at the position of the sample fixing plane 150), The recessed portion constitutes a second cavity. The second fixing portion 20 may also have markers such as protrusions for positioning.

As mentioned above, because the system proposed in this application uses the molding medium on both sides of the glass preform to form pressure to achieve hot bending, compared with the system that uses molds on both sides to achieve hot bending, according to the embodiment of the present application The system can have lower requirements on the accuracy of the mold, especially the mold that is not responsible for forming one side of the curved surface of the two molds (such as the first mold 110), and the shape of its inner surface has nothing to do with the final prepared curved glass sheet. Therefore, this The material of the mold on one side may not be particularly limited, as long as the sealing effect can be achieved.

In order to make the molding medium more uniformly supplied into the molding space, at least one of the first mold 110 and the second mold 120 may have multiple molding medium outlets. Referring to Figs. 3-6, one molding medium inlet may be provided on the side of the mold away from the molding space, and a plurality of symmetrical molding medium outlets may be provided on the side facing the molding space. Multiple molding medium outlets are connected to one molding medium inlet, so the pressure of the molding medium at the multiple outlets is the same. The multiple outlets are arranged symmetrically, so that the forming medium can be more evenly supplied to the forming space, avoiding excessive pressure at a single outlet and impacting the glass preform 500.

Since the system according to the present application uses the pressure difference between the forming medium on both sides of the first cavity and the second cavity to realize the hot bending of the curved glass sheet, the specific shape of the curved glass sheet may not be affected by the precision of the mold processing. limits. 9 and 10, the second mold 120 may include a bottom mold 12A, and a lateral parting mold 12B that surrounds the bottom mold and can slide in a direction parallel to the bottom mold. Therefore, when it is necessary to take out the molded curved sheet material, it is only necessary to slide the side parting mold 12B to the side away from the molding space (in the direction shown by the arrow in FIG. 10). For example, referring to (c) and (d) in FIG. 8, the sidewalls of the lateral parting mold 12B and the bottom mold 12A can form the curved surface of the curved plate, and the surface of the lateral parting mold 12B in contact with the first mold, then It can be used to form a flat section of curved glass. The plane section can provide a margin for the subsequent processing of the curved glass. The parting surface of the lateral parting mold 12B and the bottom mold 12A can be selected at the rounded corners to prevent the local mold position from being too low in strength to meet the requirements. In some examples of the present application, the lateral parting mold 12B and the bottom mold 12A can also be divided in an inclined plane, that is, the four lateral parting molds 12B move diagonally downward to open the mold. As a result, friction between the lateral parting mold 12B and the glass in the flat section of the curved plate can be prevented, resulting in deformation of the formed part. After the lateral parting mold 12B moves diagonally, it can effectively reduce the contact with the glass plate during the movement of the mold. Area, reduce the force, and ensure the accuracy and surface quality of the formed parts.

In order to adjust the pressure in the first cavity 130 and the second cavity 140 more accurately, referring to FIG. 3, the molding medium supply unit may also have a function of adjusting pressure (or pressure). Specifically, the molding medium supply channel 11A connected to the first mold 110 and the molding medium supply channel 11B connected to the second mold 120 are provided with a flow meter or switch capable of controlling the flow of the molding medium. Thus, the pressure in the two cavities can be adjusted, thereby controlling the pressure difference between the two cavities at an appropriate value. Regarding the specific operation method for controlling the pressure difference in the two cavities, the detailed description has been made above, and will not be repeated here. Those skilled in the art can understand that after the hot bending of the glass prefabricated plate is realized, the molding medium in the first cavity and the second cavity needs to be discharged to restore the pressure of the molding space to open the mold to take out the plate. The molding medium supply unit 200 may further include an element (such as a pump, etc.) that can draw the molding medium out of the molding space. In some examples of this application, the supply and extraction of the molding medium can be achieved through the same pipeline. Therefore, it is beneficial to reduce the area occupied by the system.

In the system proposed in the present application, the heating unit 300 may be connected to at least one of the forming medium supply unit 200 and the forming mold to provide heat to realize the hot bending of the glass preform. For example, the heating unit 300 may be connected to a forming mold, and by heating the mold, the glass preforms therein reach the forming temperature. For example, the heating unit may include a heating rod disposed inside the mold. The heating unit 300 may also be connected to the molding medium supply unit 200. Thus, the molding medium can be used to heat the sample in the mold by heating the molding medium. Alternatively, the heating unit can also be connected to both the molding medium supply unit 200 and the molding die, so as to select components for heating according to specific product conditions in practical applications.

In another aspect of this application, this application proposes an electronic device. Referring to FIG. 11, the electronic device 2000 includes: a housing 2100, a display screen, a battery, and a main board (not shown in the figure). Specifically, the casing 2100 includes the aforementioned glass cover, the battery is electrically connected to the main board and the display screen, and at least one of the battery and the main board is located in the casing. Therefore, the electronic device has at least all the features and advantages of the aforementioned glass cover, which will not be repeated here. In general, the electronic device has at least one of the advantages of better cover molding accuracy, less defects such as orange lines, unevenness and indentation, and good mechanical properties of the electronic device housing.

Specifically, referring to FIG. 12, the housing 2100 includes an integrated side frame portion 22 and a back cover portion 21, the side frame portion 22 and the back cover portion 21 define a receiving space (not shown in the figure), a battery, a main board, and The display screens may all be located inside the containing space. The light emitting side of the display screen is located on the side away from the rear cover 21, so as to realize that the display screen is visible. That is, the casing may be a casing that integrates the back cover and the side frame of the electronic device.

It should be noted that the specific types of electronic devices in this application are not particularly limited. Exemplarily, the electronic device may be any of various types of computer system devices that are mobile or portable and perform wireless communication. Specifically, the electronic device may be a mobile phone or a smart phone (for example, a phone based on iPhone TM, a phone based on Android TM), a portable game device (for example, Nintendo DS TM, PlayStation Portable TM, Gameboy Advance TM, iPhone TM), laptop Computers, PDAs, portable Internet devices, music players, and data storage devices, other handheld devices, such as watches, earphones, pendants, headsets, etc., electronic devices can also be other wearable devices (such as electronic Glasses, electronic clothes, electronic bracelets, electronic necklaces, electronic tattoos, electronic devices or head-mounted devices (HMD) for smart watches). The electronic device can also be any one of multiple electronic devices, including but not limited to cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, Video recorders, cameras, other media recorders, radios, medical equipment, vehicle transportation equipment, calculators, programmable remote controls, pagers, laptop computers, desktop computers, printers, netbook computers, personal digital assistants (PDAs), portable multimedia Players (PMP), Moving Picture Experts Group (MPEG-1 or MPEG-2) Audio Layer 3 (MP3) players, portable medical equipment and digital cameras and combinations thereof. In some cases, electronic devices can perform multiple functions (for example, play music, display videos, store pictures, and receive and send phone calls). If desired, the electronic device may be a portable device such as a cell phone, media player, other handheld device, wrist watch device, pendant device, earpiece device, or other compact portable device.

In the description of this application, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and does not require that the application must be specified The azimuth structure and operation cannot be understood as a limitation of the application. For example, specifically, the above-mentioned “upper surface” of the present application may be the surface facing the outside after the glass substrate is used in the electronic device, and the “lower surface” may be the surface facing the inside of the electronic device.

In the description of this specification, the description with reference to the terms "one embodiment", "another embodiment", etc. means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the application . In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the characteristics of the different embodiments or examples described in this specification without contradicting each other. In addition, it should be noted that in this specification, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present application. A person of ordinary skill in the art can comment on the foregoing within the scope of the present application. The embodiment undergoes changes, modifications, substitutions and modifications.

Claims

A method for preparing curved glass plates includes:

The flat glass preform is placed in a forming mold and fixed. The forming mold includes a first mold and a second mold. A closed first cavity is formed between the first mold and the glass preform. A closed second cavity is formed between the second mold and the glass preform, and the second mold has a curved surface on the side facing the second cavity, or the first mold faces the first One side of a cavity has a curved surface;

The molding medium is introduced into the first cavity and the second cavity, and the pressure in the first cavity is maintained to match the pressure in the second cavity. Heat up

A pressure difference is formed between the first cavity and the second cavity, so that the glass preform is attached to the second mold or the first mold to form the curved glass sheet.
The method according to claim 1, after the glass preform reaches a softening temperature, a pressure difference is formed between the first cavity and the second cavity.
The method according to claim 1 or 2, after a pressure difference is formed between the first cavity and the second cavity, the pressure difference is kept constant until the glass preform and the The second molds are fully bonded.
The method according to claim 3, wherein the pressure difference is 0.5 MPa to 4 MPa.
The method according to claim 1 or 2, after a pressure difference is formed between the first cavity and the second cavity, the pressure difference is gradually increased or the pressure difference is gradually reduced until the pressure difference The glass prefabricated plate is completely attached to the second mold.
The method according to claim 5, after the pressure difference is formed, the value of the pressure difference is gradually increased, and when the value after the increase of the pressure difference is greater than 1 MPa, the amount by which the pressure difference changes in a single time Not more than 0.1MPa.
The method according to any one of claims 1 to 6, wherein the molding medium is preheated to the molding temperature of the glass preform and then passed into the first cavity and the second cavity, and used The molding medium heats the glass preform.
The method according to any one of claims 1 to 6, wherein the molding medium includes a glass strengthening medium.
The method according to claim 8, the method comprising:

After passing the molding medium with matching pressure into the first cavity and the second cavity, heating the mold to reach the strengthening temperature of the strengthening medium and performing strengthening treatment;

The temperature at which the mold is heated is adjusted so that the glass preform in the mold reaches a softening temperature or higher.
The method according to any one of claims 1-9, after bonding the glass preform and the second mold, further comprising:

After cooling, discharge the molding medium inside the mold so that the pressure inside the mold is atmospheric pressure;

Open the closed first mold and the second mold, and take out the curved glass sheet.
The method according to any one of claims 1-10, wherein the second mold includes a bottom mold, and a lateral parting mold that surrounds the bottom mold and can slide to a side away from the molding space, opening and closing all The first mold and the second mold further include:

Slide the lateral parting mold to the side away from the molding space.
A system for preparing curved glass plates, the system comprising:

A forming mold, the forming mold includes a first mold and a second mold, the second mold has a curved surface on the side facing the first mold or the first mold faces the second mold It has a curved surface, the first mold and the second mold each have a molding medium supply channel communicating with the molding space, and the side of the first mold facing the molding space has a first sample A fixing part, the side of the second mold facing the molding space has a second sample fixing part, the first sample fixing part and the second sample fixing part can define a sample fixing inside the molding space A plane, a first cavity is provided between the first mold and the sample fixing plane, and a second cavity is provided between the second mold and the sample fixing plane;

A molding medium supply unit which is connected to the first mold and the second mold respectively; and

A heating unit connected to at least one of the molding medium supply unit and the molding die.
The system according to claim 12, at least one of the first mold and the second mold has a molding medium inlet on the side away from the molding space, and on the side facing the molding space There are a plurality of symmetrically arranged molding medium outlets, and the plurality of molding medium outlets are all connected with the molding medium inlet.
According to the system according to claim 12 or 13, the second mold includes a bottom mold and a lateral parting mold that surrounds the bottom mold and can slide to a side away from the molding space.
According to the system according to any one of claims 12-14, the heating unit is only connected to the molding medium supply unit.
A glass cover plate, the glass cover plate comprises a curved glass plate, the curved glass plate is prepared by the method of any one of claims 1 to 11, or the curved glass plate is prepared by using the method of claim 12- 15 prepared by the system described in any one.
An electronic device, characterized in that it comprises:

A housing, the housing comprising the glass cover plate of claim 16;

A display screen, a battery, and a main board, the battery is electrically connected to the main board and the display screen, and at least one of the battery and the main board is located in the casing.
The electronic device according to claim 17, wherein the housing includes an integrated side frame portion and a back cover portion, the side frame portion and the back cover portion define an accommodation space, the battery, the main board, and The display screen is located inside the accommodating space, and the light emitting side of the display screen is located on the side away from the back cover part.