KR102159120B1 - Curved glass forming mold and curved glass forming method using the same - Google Patents

Abstract

An embodiment of the curved glass molding frame, the support region for supporting the glass to be seated; And a heating block disposed in the support region so that at least a portion of the glass is in contact with one surface of the glass at a bending portion of the glass when the glass is seated in the support region, and the heating block includes the glass and It may be formed of a material having a higher thermal conductivity than the support region.

Description

Curved glass forming mold and curved glass forming method using the same {Curved glass forming mold and curved glass forming method using the same}

The embodiment relates to a curved glass molding mold having a structure capable of reducing the heating time as much as possible and thus suppressing excessive exposure of the glass and the molding mold to high temperatures, and a curved glass molding method using the same.

The content described in this section merely provides background information on the embodiment and does not constitute the prior art.

In general, a curved glass with a side bent may be used for a vehicle window or a dashboard. In addition, in recent mobile devices such as smart phones, smart watches, tablet PCs, and mobile phones, various curved glasses are used for reasons such as improved design, increased functions, and user convenience.

In general, the curved glass has a shape including a flat portion, which is a plate-shaped portion having a relatively small curvature when viewed in a plane or cross section, and a curved portion, which is a curved portion having a relatively large curvature at one side or edge of the flat portion.

In general, in the case of forming a curved glass, the glass having a planar structure is heated to form the entire glass into a curved surface, or a part of the glass is formed into a curved surface.

In the case of heating, it is necessary to reduce the consumption of heat inputted for heating as much as possible. In addition, when the glass is exposed to high temperatures for a long period of time, the glass made of a glass material may be deteriorated, so it is necessary to prevent this.

On the other hand, since the mold for molding the glass is also heated, it is also necessary to suppress oxidation or deterioration due to the long exposure of the mold to high temperatures.

Accordingly, the embodiment relates to a glass molding mold having a structure capable of reducing the heating time as much as possible and thus suppressing excessive exposure of the glass and the molding mold to high temperatures, and a curved glass molding method using the same.

The technical problem to be achieved by the embodiment is not limited to the technical problem mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the embodiment belongs from the following description.

An embodiment of the curved glass molding frame, the support region for supporting the glass to be seated; And a heating block disposed in the support region so that at least a portion of the glass is in contact with one surface of the glass at a bending portion of the glass when the glass is seated in the support region, and the heating block includes the glass and It may be formed of a material having a higher thermal conductivity than the support region.

The support area may include a guide part for maintaining the glass seating; A seating portion formed by being recessed in the support region so as to be surrounded by the guide portion, and on which the glass is seated; And a curved portion formed in a part of the seating portion and formed in a curved shape at a position corresponding to a bending portion of the glass seated in the seating portion, and the heating block may be disposed on at least a portion of the curved portion. .

The heating block has a width corresponding to the width of the seating portion, is mounted in a recess formed on the curved portion, and at least a part of the upper surface is formed to have a curvature corresponding to a bending curvature of the glass. Can be.

The support region may be formed of a diatomaceous earth material, and the heating block may be formed of a graphite material.

The support region may be formed of a diatomaceous earth material, and the heating block may be formed of a material including at least one component of gold, silver, copper, brass, stainless steel, carbon nanotubes, graphene, and aluminum.

At a temperature at which the bending portion of the glass is bent, the temperature of the heating block may be higher than the temperature of the support region.

An embodiment of the curved glass forming method, in the curved surface forming method of the glass using the glass forming frame, the seating step of mounting the glass in the support region; A heating step of heating the glass mold; A bending process in which the bending portion of the glass is heated and is bent by its own weight; And a cooling process of cooling the glass on which the bending process has been completed.

The bending process may be that the glass is bent in a state in which the temperature of the heating block is higher than the temperature of the support region.

In the embodiment, the heating block is heated to a high temperature faster than the support area, and only the portion of the glass in contact with the heating block reaches the plastic deformation temperature to form a curved surface by bending, so that the consumption of heat is reduced and the entire process proceeds. By shortening the time and effectively suppressing the deterioration of the entire glass, it is possible to significantly reduce the occurrence of poor quality of the glass.

In the embodiment, since only the heating block is heated above the plastic deformation temperature of the glass, the molding temperature is overall low. Accordingly, deterioration or oxidation of the glass and the glass mold due to high temperature exposure can be suppressed, so that the life of the glass mold can be extended.

In the embodiment, since partial high-temperature heating of the glass by the heating block is possible, it is possible to very easily manufacture a glass product having a structure in which a surface is formed on a part.

1 is a plan view showing a glass of an embodiment.
2 is a side view showing a glass of an embodiment. 1 and 2 show a glass in which a curved surface is formed by bending.
3 is a plan view showing a glass molding mold according to an embodiment.
4 is a cross-sectional view taken along AA in FIG. 3.
5 is a cross-sectional view taken along the BB direction in FIG. 3.
6 is a flow chart showing a method of forming a curved glass according to an embodiment.
7 is a view showing a state in which glass is seated on a glass mold in the curved glass forming method of an embodiment.
8 is a view showing a state in which glass is bent in a method of forming a curved glass according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Since the embodiments can be modified in various ways and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiments to a specific form of disclosure, and it should be understood that all changes, equivalents, and substitutes included in the spirit and scope of the embodiments are included.

Terms such as "first" and "second" may be used to describe various elements, but the elements should not be limited by the terms. The terms are used for the purpose of distinguishing one component from another component. In addition, terms specifically defined in consideration of the configuration and operation of the embodiment are only for describing the embodiment, and do not limit the scope of the embodiment.

In the description of the embodiment, in the case of being described as being formed on the "top (top)" or "bottom (on or under)" of each element, the top (top) or bottom (bottom) (on or under) ) Includes both elements in which two elements are in direct contact with each other or in which one or more other elements are indirectly formed between the two elements. In addition, when expressed as “up (up)” or “on or under”, the meaning of not only an upward direction but also a downward direction based on one element may be included.

In addition, relational terms such as "top/top/top" and "bottom/bottom/bottom" used below do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It may be used to distinguish one entity or element from another entity or element.

1 is a plan view showing a glass 10 according to an embodiment. 2 is a side view showing the glass 10 according to an embodiment. 1 and 2 illustrate a glass 10 in which a curved surface is formed by bending.

The glass 10 of the embodiment may be used for a cover glass 10 of a mobile device, a light guide plate, and other various purposes. In addition, the glass 10 may be used for purposes such as forming windows, dashboards and other components of a vehicle. The glass 10 has a thin thickness, for example, it is transparent and may be formed of a glass material.

The glass 10 has a curved surface, and in this case, the curved surface of the glass 10 may be formed by heating and bending. That is, the flat glass 10 is heated, and the temperature of the heating portion is increased to become soft, so that the heated portion is bent, thereby forming a curved surface.

Specifically, when the glass 10 is placed in a chamber (not shown) with a heating device and the glass 10 is heated with the heating device, the glass 10 becomes soft and plastic deformation occurs when it reaches a specific temperature. In this state, it can be bent to form a curved surface. For this curved surface molding, a glass molding frame on which the glass 10 is seated is required.

That is, by placing the glass 10 in a chamber while seated on a glass molding mold and heating the glass 10 using the heating device, a curved surface can be formed on a required portion of the glass 10.

3 is a plan view showing a glass mold according to an embodiment. 4 is a cross-sectional view taken along AA in FIG. 3. 5 is a cross-sectional view taken along the BB direction in FIG. 3.

The glass mold of the embodiment may include a support region 100 and a heating block. The support region 100 may support the glass 10 so that the glass 10 is seated. When the glass 10 is seated on the support region 100, the heating block is configured such that at least a portion of the glass 10 is in contact with one surface of the glass 10 at a bending portion of the glass 10. ) Can be placed.

In this case, the heating block may be formed of a material having a higher thermal conductivity than the glass 10 and the support region 100. Accordingly, since the heating block has a higher thermal conductivity than the glass 10 and the support region 100, it can be heated to a higher temperature faster than the glass 10 and the support region 100.

If the heating block and the support region 100 are provided with the same material, or when the glass molding frame is formed only with the support region 100 without a heating block, the glass 10 seated on the glass molding frame is uniformly When heated, it will have a uniform temperature distribution.

In this case, the entire glass 10 must be heated to a high temperature where plastic deformation occurs for bending. When the entire glass 10 is heated to a high temperature, a lot of heat is consumed for heating, and the heating time increases, so that the progress of the process is slow, and the entire glass 10 may be deteriorated due to exposure to high temperatures for a long time. ) May cause quality defects.

Therefore, in the embodiment, only the portion of the glass 10 that needs to form a curved surface is heated to a high temperature capable of plastic deformation, and the remaining portion is maintained at a relatively low temperature, effectively suppressing exposure of the entire glass 10 to excessive high temperature. It has a structure to do.

The support region 100 may include a guide portion 110, a seating portion 120, and a curved portion 130. The guide unit 110 may be provided to protrude while surrounding the seating portion 120 on which the glass 10 is seated in order to maintain the seating of the glass 10.

The seating portion 120 is formed by being recessed in the support region 100 so as to be surrounded by the guide portion 110, and the glass 10 may be seated. 3 and 4, in order to smoothly process the curved surface of the glass 10, the front part of the support area 100 is provided with the guide part 110 not formed and the seating part 120 open. I can.

The curved portion 130 may be formed on a part of the seating portion 120 and formed in a curved shape at a position corresponding to the bending portion of the glass 10 seated on the seating portion 120. In the drawings of the embodiment, one curved portion 130 is shown, but when there are a plurality of curved surfaces to be formed on the glass 10, a plurality of curved portions 130 may be formed on the seating portion 120 in a corresponding number. I can. Of course, a plurality of heating blocks may be provided in a number corresponding to the corresponding position on the curved surface.

In an embodiment, the heating block may be disposed on at least a portion of the curved portion 130. That is, the curved portion 130 may be formed at a position corresponding to a portion where the curved surface is formed on the glass 10, and similarly, the heating block may be disposed at a position corresponding to the curved portion 130.

3 to 5, the heating block has a width of a size corresponding to the width of the seating portion 120, is mounted in the recessed groove 131 formed in the curved portion 130, the upper surface At least a portion of the glass 10 may be formed to have a curvature corresponding to the bending curvature of the glass 10. For example, some of the upper surface of the heating block may be formed as a flat surface and the rest may be formed as a curved surface.

When the heating block is formed of graphite, for example, since the graphite is oxidized at a high temperature, its service life may be limited. Therefore, in order to easily replace the heating block that has reached the end of its service life, the heating block may be provided to be easily mounted and detached in the recessed groove 131 in a custom manner.

In an embodiment, when the glass 10 is heated by a heating device in the chamber while seated on the seating portion 120, the temperature at which the bending portion of the glass 10 is bent, that is, the temperature of the heating block at the bending temperature is It becomes higher than the temperature of the support region 100. In this case, the bending temperature may be higher than or equal to the plastic deformation temperature of the glass 10.

This is because the heat conductivity of the heating block is higher than that of the support area 100, so when the glass molding frame and the glass 10 are heated by the heating device in the chamber, the heating block reaches a higher temperature faster than the support area 100. Because it does.

The glass 10 may receive heat transfer by convection and radiation from a heating device by heating, and may receive heat transfer by conduction from a heating block and a seating portion 120 in direct contact.

When the heating block reaches the bending temperature, since the temperature of the heating block is the highest, heat is transferred from the heating block to the glass 10 in contact therewith, so that the glass 10 can reach the plastic deformation temperature.

Even if the glass 10 reaches the plastic deformation temperature in the curved portion 130 in contact with the heating block, the remaining portion of the glass 10, that is, the portion not directly in contact with the heating block does not reach the plastic deformation temperature. This is because the temperature of the support region 100 has not reached the plastic deformation temperature in the remaining portion.

Therefore, when the heating block reaches the bending temperature, the portion in contact with the heating block in the glass 10, that is, the portion corresponding to the curved portion 130, undergoes plastic deformation due to the self weight of the glass 10, and thus A curved surface may be formed at a location designed on the glass 10.

At this time, the rest of the glass 10 that is not in contact with the heating block is not plastically deformed because it is lower than the plastic deformation temperature, and thus a curved surface is not formed. Even if the rest of the glass 10 is temporarily heated higher than the plastic deformation temperature, the curved surface is not formed by its own weight since there is no on the curved surface 130.

If the entire glass molding frame is formed of a single material, for example, diatomaceous earth material, since the entire glass 10 is uniformly heated, the glass 10 is heated to the plastic deformation temperature, and the weight of the glass 10 Thus, in the method of forming a curved surface, it is possible to form a curved surface having a gentle curvature as a whole. However, in this case, it is very difficult to form the curved glass 10 having a locally large curvature as shown in FIG. 2.

If the entire glass mold is formed of graphite, graphite having a higher thermal conductivity than the glass 10 absorbs more heat than the glass 10 and reaches a temperature higher than the plastic deformation temperature of the glass 10 can do.

In this case, it takes a very long heating time to increase the consumption of heat, and the entire process may be delayed. In addition, since the glass 10 is exposed to unnecessary high temperatures, deterioration may occur and product defects may occur.

In addition, graphite is exposed to high temperatures to cause oxidation, and thus, the life of the glass mold may be shortened. In addition, oxides caused by heat of graphite are adsorbed on the surface of the glass 10, and a separate polishing process may be required on the product of the glass 10 to remove the oxide.

In the embodiment, the heating block is heated to a high temperature faster than the support region 100, and only the portion of the glass 10 in contact with the heating block reaches the plastic deformation temperature to form a curved surface by bending, so that the consumption of heat is reduced. It is possible to reduce, shorten the duration of the entire process, and effectively suppress deterioration of the entire glass 10, thereby significantly reducing the occurrence of quality defects of the glass 10.

In addition, it is possible to very effectively overcome the above-described disadvantages that occur when a single material glass mold is used.

In an embodiment, for example, the support region 100 may be formed of a diatomaceous earth material, and the heating block may be formed of a graphite material. Diatomaceous earth has a thermal conductivity of about 0.06 to 0.08 W/mK, and graphite has a thermal conductivity of about 480 to 530 W/mK. That is, the heating block formed of graphite has a significantly higher thermal conductivity than the support region 100 formed of diatomaceous earth.

In an embodiment, for example, the support region 100 is formed of a diatomaceous earth material, and the heating block is gold, silver, copper, brass, stainless steel, carbon nanotube (CNT), graphene. And it may be formed of a material containing at least one component of aluminum. That is, the heating block may be formed of a material having better thermal conductivity than graphite.

On the other hand, suitably, the support area 100 and the heating block are a material that does not melt at 450 to 850°C, which is the curving temperature of the glass 10, that is, a material that does not melt at 850°C or less, which is the maximum temperature of the surface forming temperature. It is appropriate to be formed with. Here, the curved surface molding temperature means a temperature environment in the chamber required to form the curved surface of the glass 10.

6 is a flow chart showing a method of forming a curved glass according to an embodiment. 7 is a view showing a state in which the glass 10 is seated on a glass molding frame in the curved glass molding method of an embodiment. 8 is a view showing a state in which the glass 10 is bent in the method of forming a curved glass according to an embodiment.

The embodiment relates to a method for forming a curved glass using a mold for forming the glass 10 having the above-described structure. The curved glass forming method of the embodiment may include a seating process (S100), a heating process (S200), a bending process (S300), and a cooling process (S400).

In the seating step (S100), the glass 10 is seated on the support region 100. At this time, as shown in FIG. 7, the glass 10 is in a state in which a curved surface is not formed.

In the heating step (S200), the glass mold may be heated. For example, it is possible to heat the glass 10 and the glass molding mold by placing a glass molding mold in which the glass 10 is seated in a chamber equipped with a heating device, and operating the heating device.

In the bending process (S300), the bending portion of the glass 10 is heated and may be bent by the weight of the glass 10. The heating block may be designed so that at least a portion of the flat glass 10 is in direct contact.

In the bending process S300, the glass 10 may be bent while the temperature of the heating block is higher than the temperature of the support region 100. That is, when the bending process (S300) is in progress, the temperature of the heating block reaches the plastic deformation temperature or higher of the glass 10, and the temperature of the glass 10 and the support region 100 is the plasticity of the glass 10 The temperature of each site can be controlled so as not to reach the deformation temperature.

This temperature control is possible because the thermal conductivity of the heating block is significantly higher than that of the glass 10 and the support region 100. Meanwhile, in order to suppress the defects of the glass 10 product as described above, the temperature of the glass 10 and the support region 100 at the time of the bending process S300 is less than the plastic deformation temperature of the glass 10 It is appropriate to control it so that it remains as.

7 and 8, the flat glass 10 has a portion in contact with the heating block, for example, the flat portion of the upper surface of the heating block receives heat from the heating block by conduction and exceeds the plastic deformation temperature. Can be heated.

Thereafter, the portion of the glass 10 corresponding to the front portion of the heating block is bent by the self weight of the glass 10, so that a curved surface may be formed on the glass 10 as shown in FIG. 8.

In the cooling process S400, the glass 10 on which the bending process S300 has been completed may be cooled. Since damage due to thermal stress may occur due to the material properties of the glass 10, it is necessary to appropriately adjust the cooling rate of the glass 10 to minimize the occurrence of such thermal stress.

In the embodiment, since only the heating block is heated above the plastic deformation temperature of the glass 10, the molding temperature is generally low. Therefore, deterioration or oxidation of the glass 10 and the glass molding mold due to high temperature exposure can be suppressed, so that the life of the glass molding mold can be extended.

In the embodiment, since partial high-temperature heating of the glass 10 by the heating block is possible, it is possible to very easily manufacture a glass product having a structure in which a curved surface is formed.

As described above with respect to the embodiment, only a few are described, but other various types of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms, unless they are technologies incompatible with each other, and may be implemented as a new embodiment through this.

10: glass
100: support area
110: guide part
120: seat
130: curved portion
131: recessed groove
200: heating block
S100: settling process
S200: heating process
S300: Banding process
S400: cooling process

Claims (8)

A support region for supporting the glass to be seated; And a heating block disposed in the support region such that when the glass is seated in the support region, at least a portion of the glass is in contact with one surface of the glass at a bending portion of the glass,
The heating block is formed of a material having a higher thermal conductivity than the glass and the support region,
The support area,
A guide part for maintaining the seating of the glass;
A seating portion recessed in the support region so as to be surrounded by the guide portion and seating the glass; And
It is formed on a part of the seating portion, and includes a curved portion formed in a curved surface at a position corresponding to the bending portion of the glass seated in the seating portion,
The heating block,
Disposed on at least a portion of the curved portion,
The heating block,
It has a width of a size corresponding to the width of the seating portion, is mounted in a recess formed on the curved portion, and at least a portion of the upper surface is formed to have a curvature corresponding to a bending curvature of the glass,
Some of the upper surface of the heating block is formed in a flat surface and the rest is formed in a curved surface,
The heating block is a curved glass molding mold, characterized in that it is provided so as to be easily mounted and detached from the recessed groove in a custom-fit manner. delete delete The method of claim 1,
The support region is formed of a diatomaceous earth material, and the heating block is formed of a graphite material. The method of claim 1,
The support area is formed of a diatomaceous earth material, and the heating block is formed of a material containing at least one component of gold, silver, copper, brass, stainless steel, carbon nanotubes, graphene, and aluminum. Glass molding mold. The method of claim 1,
A curved glass molding mold, characterized in that at a temperature at which the bending portion of the glass is bent, the temperature of the heating block is higher than the temperature of the support region. In the curved glass forming method using the curved glass forming frame of claim 1,
A seating process of seating the glass in the support area;
A heating step of heating the glass mold;
A bending process in which the bending portion of the glass is heated and bent by its own weight; And
Cooling process of cooling the glass on which the bending process has been completed
Containing
Curved glass forming method. The method of claim 7,
The banding process,
The method of forming a curved glass, characterized in that the bending of the glass proceeds while the temperature of the heating block is higher than the temperature of the support region.

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