KR101671624B1

KR101671624B1 - Forming mold for glass and manufacturing method thereof

Info

Publication number: KR101671624B1
Application number: KR1020150051671A
Authority: KR
Inventors: 윤하나
Original assignee: 주식회사 티씨케이
Priority date: 2015-04-13
Filing date: 2015-04-13
Publication date: 2016-11-01
Also published as: KR20160121884A

Abstract

The present invention relates to a mold for glass molding and a method of manufacturing the same, wherein the contact surface is a graphite material and has a first surface arranged to be spaced apart from each other; SiC material is disposed between the first surface and the second surface and has a second surface having the same height as the first surface. In the present invention, graphite and SiC are cross-placed on the glass contact surface of the glass molding mold, thereby reducing the temperature deviation between the center and the edge, thereby preventing the glass from breaking and improving the yield.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for glass molding,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold for glass molding and a method of manufacturing the same, and more particularly, to a mold for glass molding capable of minimizing a temperature deviation between an edge and a central portion.

In general, a mold having a product shape is used for manufacturing a glass product such as a spectacle lens or a glass lens for a camera.

Typical molds use tungsten carbide (DLC) coating, a release material. Such a structure is described in detail in Patent No. 10-0827002.

The above-mentioned Patent Document 10-0827002 discloses a structure in which upper and lower molds are made of carbide or nitrogen, and a protective layer is formed on the upper and lower molds, and DLC or the like can be used as the protective layer.

However, molds using the above-mentioned DLC can be used for forming spectacle lenses or camera lenses having a low softening point of glass. In recent years, in order to fabricate a cover glass for mobile phone by molding, Molds used as layers can not be used.

The above-mentioned cover glass for mobile phones uses glass having a high softening point by nature, and a molding temperature of 700 ° C or higher is generally required. However, the conventional protective layers such as the DLC can not be used due to damage at a temperature of 700 캜. Such a phenomenon can not be used when the side portion of the cover glass for a cellular phone is curved in an arcuate shape in cross section.

In order to solve such a problem, a graphite mold having excellent heat resistance has been proposed. However, since pores are present in the material itself, there is a problem that the pores are transferred directly to the glass molded article and new problems occur in that the mold is oxidized .

In order to solve such a pore-type transfer and oxidation problem, a mold made of a SiC material having high hardness at high temperature is used. Such a mold having SiC as a protective layer is formed by depositing a SiC layer on a graphite material by chemical vapor deposition (CVD), and then subjecting the SiC layer to mirror-surface processing.

However, there is a problem that the glass adheres to the SiC layer during the process of forming the glass, thereby causing a crack in the cooling process. This is because SiC can not serve as a sufficient releasing material.

In view of such problems, the proposed technique is the registered patent 10-1451207 (registered on Oct. 8, 2014, glass molding mold and its manufacturing method) of the present applicant. In the above patent, a graphite mold is used and the C / SiC composite layer is disposed as a protective layer on the surface where the mold is in contact with the glass, thereby solving the above problems.

However, when the mold is heated for molding glass, the temperature difference between the edge and the center becomes larger as the size of the mold increases, and the glass breaks due to such temperature difference The yield is lowered.

That is, although it is easy to apply to a small-sized glass molding product, when the area is relatively large like a liquid crystal glass of a smartphone or a tablet PC, the yield is lowered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a mold for glass molding capable of minimizing a temperature deviation between an edge and a central portion and a method of manufacturing the same.

In order to achieve the above object, the present invention provides a mold for glass molding having a contact surface that is in contact with a glass, the contact surface comprising: a first surface, which is made of a graphite material, And a second surface disposed between and around the first surface and having the same height as the first surface.

The first surface may be square, rectangular or circular in plan view.

The first surface and the second surface may be formed in an area of 40 to 60% with respect to the total area of the contact surface.

The glass mold for molding according to the present invention comprises the steps of: a) processing a graphite base provided with protrusions which are mutually spaced apart from each other, the protrusions being a first flat surface, b) depositing SiC on the graphite base, Forming a SiC layer on top of the space between the first and second surfaces, c) processing the SiC layer from above to expose the first surface, and placing a second surface between and around the first surface do.

The first surface may be square, rectangular or circular in plan view.

The first surface and the second surface may be formed in an area of 40 to 60% of the total area of the contact surface.

According to the present invention, there is provided a mold for glass molding and a method of manufacturing the same, wherein graphite and SiC are cross-disposed on a glass contact surface of a mold for glass molding to reduce temperature deviation between the center and the edge, There is an effect that can be improved.

In addition, by the cross arrangement of the graphite and the SiC, the transfer rate of the pores can be lowered compared with the conventional method using only the graphite.

1 is a plan view of a mold for glass molding according to a preferred embodiment of the present invention.
FIGS. 2 to 4 are cross-sectional views illustrating a manufacturing process of a mold for glass molding according to a preferred embodiment of the present invention.
5 is a plan view of a mold for glass molding according to another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a mold for glass molding according to the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a glass molding mold according to a preferred embodiment of the present invention, and FIGS. 2 to 4 are sectional views showing the manufacturing process of a glass molding mold according to a preferred embodiment of the present invention.

Referring to FIGS. 1 to 4, the glass mold according to the preferred embodiment of the present invention is characterized in that the glass contact surface has a first surface 11 of a graphite material having a predetermined area, And a second side 21 of SiC material disposed between and around the first side 11 and flush with the first side 11.

Hereinafter, a mold for glass molding and a method of manufacturing the same according to a preferred embodiment of the present invention will be described in detail.

First, the graphite base 10 is prepared as shown in Fig.

The graphite base 10 may have a circular shape or a square shape in consideration of an area and a shape of the glass to be molded. The upper surface of the graphite base 10 is a shape in which the projections 12 as the first surface 11 protrude upward.

The protrusions 12 have a predetermined area and are spaced apart from each other at regular intervals.

The area of the first surface 11, which is the upper surface of the protrusion 12, is 40 to 60% of the total area of the graphite base 10. If it is less than 40%, the effect of reducing thermal deviation is small. If it exceeds 60%, the pores of the first surface 11 of the graphite material may be transferred.

The shape of the graphite base 10 as described above can be easily manufactured by mechanically machining the graphite plate.

Then, as shown in Fig. 3, the graphite base 10 on which the protrusions 12 are formed is charged into a vapor deposition furnace, and SiC is deposited by chemical vapor deposition.

The SiC layer 20 is deposited on the graphite base 10 by deposition of the SiC.

The SiC layer 20 is deposited not only on the first side 11 which is the upper surface of the protrusion 12 of the graphite base 10 but also on the space 13 between the protrusions 12 .

Although the upper surface of the deposited SiC layer 20 is shown as being substantially flat in the figure, in reality, there is a slight step difference due to the step between the protruding portion 12 and the spacing space portion 13.

Then, as shown in FIG. 4, the deposited SiC layer 20 is removed from the upper surface by mechanical processing.

The SiC layer 20 is removed and the upper surface 11 of the protrusion 12 is exposed. At this time, the second surface 21 of the SiC layer 20 processed to be flat with the first surface 11 is exposed upward. The SiC layer 20 is located only inside the spaced apart space 13, which is a region excluding the protruding portion 12, and only around the protruding portion 12 of the outer perimeter.

Therefore, the structure of FIG. 1 in which the second surface 21 is located on the entire circumference of the first surface 11 can be manufactured.

The second surface 21 of the SiC layer 20 has an area of 40 to 50% of the total area of the mold.

The SiC layer 20 reduces the exposed area of the first side 11 of the graphite base 10 to minimize the progress of oxidation, thereby reducing the generation of pores and reducing its transfer.

Further, since the first surface 11 of the graphite material is disposed between the second surface 21 of the SiC layer 20, uniformity of temperature can be ensured, and a glass having a temperature deviation between the peripheral portion and the central portion It is possible to prevent the occurrence of the cracking phenomenon and to improve the yield.

5 is a plan view of a mold for glass molding according to another embodiment of the present invention.

Referring to FIG. 5, the first surface 11 is formed in a long shape in one direction, and a large number of the first surfaces 11 are arranged in parallel with each other, and the second surface 12 is disposed between the first surfaces 11.

Such a structure is determined depending on how the shape of the protrusion 12 is processed when the protrusion 12 is machined on the graphite base 10.

The structure of FIG. 5 is easier and more advantageous to process the protrusions 12 than the structure of FIG.

As described above, the first surface 11 and the second surface 21 may have a very wide variety of configurations, and the shape of the first surface 11 may be a very wide variety of shapes such as a circle, a square, have.

5, the areas of the first surface 11 and the second surface 21 are respectively 40 to 60% of the total area.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

10: graphite base 11: first side
12: protruding portion 13:
20: SiC layer 21: second side

Claims

1. A glass forming mold having a contact surface in contact with a glass,
The contact surface
A first surface of graphite material and spaced apart from each other;
And a second surface of SiC material disposed between and around the first surface and having the same height as the first surface.

The method according to claim 1,
Wherein the first surface is rectangular, rectangular or circular in plan view.

The method according to claim 1,
Wherein the first surface and the second surface are respectively formed in an area of 40 to 60% in the total area of the contact surface.

a) machining a graphite base provided so that protrusions, which are first planar surfaces, are spaced apart from each other;
b) depositing SiC on said graphite base to form a SiC layer on top of said first surface and above said spaces between said protrusions; And
c) processing the SiC layer from above to expose the first surface, and placing a second surface between and around the first surface.

5. The method of claim 4,
Wherein the first surface is rectangular, rectangular or circular in plan view.

5. The method of claim 4,
Wherein the first surface and the second surface are respectively formed in an area of 40 to 60% in the total area of the contact surfaces contacting the glass.