KR101505470B1 - Method for manufacturing tempered glass cell - Google Patents

Method for manufacturing tempered glass cell Download PDF

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Publication number
KR101505470B1
KR101505470B1 KR1020130049928A KR20130049928A KR101505470B1 KR 101505470 B1 KR101505470 B1 KR 101505470B1 KR 1020130049928 A KR1020130049928 A KR 1020130049928A KR 20130049928 A KR20130049928 A KR 20130049928A KR 101505470 B1 KR101505470 B1 KR 101505470B1
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South Korea
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tempered glass
glass cell
laser beam
cell
irradiated
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KR1020130049928A
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Korean (ko)
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KR20140131449A (en
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박홍진
서종현
조광우
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주식회사 엘티에스
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Optics & Photonics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Laser Beam Processing (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Thermal Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)

Abstract

The present invention relates to a method of manufacturing a tempered glass cell, which includes a cell placement step and a side strengthening step. In the cell placement step, the tempered glass cell is disposed such that the laser beam is irradiated onto the upper surface of the tempered glass cell cut from the tempered glass plate. The side strengthening step irradiates the laser beam to the upper edge portion of the tempered glass cell and strengthens the cut side of the tempered glass cell while moving the laser beam along the edge of the tempered glass cell.

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a tempered glass cell,

The present invention relates to a method of manufacturing a tempered glass cell, and more particularly, to a method of manufacturing a tempered glass cell that uses a laser beam to strengthen a cut side of a tempered glass cell.

Generally, a tempered glass cell applied to a portable terminal such as a touch screen and a cell phone corresponds to an outer layer of a display panel and is used to prevent scratches from being generated on a display panel such as an LCD or an OLED, Respectively. Such reinforced glass cells have various external shapes according to the shapes of the touch screen and the portable terminal. For this purpose, a processing such as cutting of the glass plate is essential.

Conventionally, a protective glass cell having a shape of a portable terminal is cut by cutting a glass plate before the reinforcing treatment due to the limitation of a mechanical cutter, and a through hole to be used for mounting a key button or a camera lens is formed on each protective glass cell Finally, reinforced glass cells were prepared by forming reinforcing layers on both sides of each protective glass cell.

However, recently, as a method for cutting a reinforced glass plate by using a laser beam has been developed, a tempered glass plate having been reinforced has been cut to produce a tempered glass cell. Since the reinforcing layer is already formed on both sides of the reinforced glass cell cut from the reinforcing glass plate, it is not necessary to separately form the reinforcing layer for each of the reinforcing glass cells, so that the production yield can be remarkably increased .

However, in the method of cutting the reinforced glass plate by using the laser beam, when the side of the reinforced glass cell cut from the reinforced glass plate is observed, the side remains unreinforced. Further, chipping generated in the cutting process is formed on the cut side of the tempered glass cell. Such chipping provides a cause for the propagation of cracks into the tempered glass cell in the future, so that the chippings are removed through a separate polishing process by hand on the side of the tempered glass cell.

In order to remove the chippings formed on the side surface of the tempered glass cell, the yield of the tempered glass cell is remarkably decreased by performing the polishing process on each tempered glass cell, which is directly connected with the increase of the labor cost. There is a problem that the unit price is increased.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems of the prior art, and to provide a method and apparatus for manufacturing a tempered glass cell by reinforcing a cut side of a tempered glass cell using a laser beam, The present invention also provides a method for manufacturing a tempered glass cell which can improve the production yield of the tempered glass cell and prevent cracks from propagating into the tempered glass cell.

According to an aspect of the present invention, there is provided a method of manufacturing a tempered glass cell, the method comprising: arranging the tempered glass cell such that a laser beam is irradiated on a top surface of the tempered glass cell cut from the tempered glass plate; And a side strengthening step of irradiating a laser beam to the upper edge of the tempered glass cell and strengthening the cut side of the tempered glass cell while moving the laser beam along the edge of the tempered glass cell, In the strengthening step, the laser beam is irradiated a plurality of times while moving the laser beam along the horizontal direction from a position where the laser beam is first irradiated.

According to another aspect of the present invention, there is provided a method of manufacturing a tempered glass cell, the method comprising: arranging the tempered glass cell such that a laser beam is irradiated on a side of the tempered glass cell cut from the tempered glass plate; And a side strengthening step of irradiating a side of the tempered glass cell with a laser beam and strengthening the cut side of the tempered glass cell while moving a laser beam along an edge of the tempered glass cell, The laser beam is irradiated a plurality of times while moving the focal position of the laser beam toward the central portion of the tempered glass cell.

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According to another aspect of the present invention, there is provided a method of manufacturing a tempered glass cell, the method comprising: arranging the tempered glass cell such that a laser beam is irradiated onto an upper surface of the tempered glass cell cut from the tempered glass plate; And a side strengthening step of irradiating a laser beam to the upper edge of the tempered glass cell and strengthening the cut side of the tempered glass cell while moving the laser beam along the edge of the tempered glass cell, The laser beam is irradiated a plurality of times while moving the focus position of the laser beam along the thickness direction of the tempered glass cell.

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According to the method for manufacturing a tempered glass cell of the present invention, it is unnecessary to perform a manual polishing process on the cut side of the tempered glass cell, so that the production yield of the tempered glass cell can be remarkably improved, It is possible to prevent propagation and improve the quality of the product.

In addition, according to the method for manufacturing a tempered glass cell of the present invention, it is possible to effectively perform the tempering process of the tempered glass cell while easily controlling the shape and length of the path of the laser beam.

Further, according to the method for manufacturing a tempered glass cell of the present invention, the width of the reinforcing layer for reinforcing the cut side of the tempered glass cell can be variously implemented.

Further, according to the method for manufacturing a tempered glass cell of the present invention, the speed at which the reinforcing layer is formed in the tempered glass cell can be increased.

FIG. 1 is a view schematically showing a method of manufacturing a tempered glass cell according to an embodiment of the present invention,
FIG. 2 is a view showing an irradiation form of a laser beam in the manufacturing method of the tempered glass cell of FIG. 1,
FIG. 3 is a view showing a case where the laser beam is irradiated while moving in the horizontal direction in the method of manufacturing the tempered glass cell of FIG. 1,
FIG. 4 is a view showing a case where the laser beam is irradiated while moving along the thickness direction of the tempered glass cell in the method of manufacturing the tempered glass cell of FIG. 1,
Fig. 5 is a view showing a modification of the method of manufacturing the tempered glass cell of Fig. 1,
6 is a view schematically showing a method of manufacturing a tempered glass cell according to another embodiment of the present invention,
7 is a view showing a case where the laser beam is irradiated while moving toward the central portion of the tempered glass cell in the manufacturing method of the tempered glass cell of FIG.

Hereinafter, embodiments of a method of manufacturing a tempered glass cell according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view schematically showing a method of manufacturing a tempered glass cell according to an embodiment of the present invention, FIG. 2 is a view showing a form of irradiation of a laser beam in the method of manufacturing a tempered glass cell of FIG. 1, FIG. 3 is a view showing a case where the laser beam is irradiated while moving the laser beam in the horizontal direction in the manufacturing method of the tempered glass cell of FIG. 1. FIG. And the irradiation is performed while moving along the direction.

Referring to FIGS. 1 to 4, a method of manufacturing a tempered glass cell according to an embodiment of the present invention is to strengthen a cut side of a tempered glass cell using a laser beam. The method includes a cell placing step S110, (S120).

The reinforced glass cell 10 in which each step of the present invention is performed may be a substrate on which a key button or a through hole 14 or the like to be used for mounting a camera lens is formed or a substrate before the through hole 14 is formed. The tempered glass cell 10 may be a substrate to which a reinforcing layer and a touch layer are attached to a glass substrate, or may be a substrate to which only a reinforcing layer is attached. Also, the tempered glass cell 10 may be a glass substrate which is reinforced by a chemical treatment or a thermal treatment without attaching the reinforcing layer or the touch layer.

In the cell placement step S110, the reinforced glass cell 10 is disposed such that the laser beam L is irradiated onto the upper surface 11 of the tempered glass cell 10 cut from the reinforced glass plate.

A laser irradiation unit 20 including a galvanometer scanner capable of irradiating the laser beam L output from the laser output unit to a desired position on the upper surface 11 of the tempered glass cell 10 and a condenser lens, The reinforced glass cell 10 is disposed on the upper side of the reinforced glass cell 10 such that the upper surface 11 of the reinforced glass cell faces the direction in which the laser beam L is irradiated.

The side strengthening step S120 may include a step of irradiating a laser beam L onto the edge of the upper surface 11 of the tempered glass cell and moving the laser beam L along the edge of the tempered glass cell 10, 10). ≪ / RTI >

The laser beam L irradiated on the upper surface 11 of the tempered glass cell is transferred to the inside of the tempered glass cell 10 and the property of the glass material changes in the tempered glass cell 10 irradiated with the laser beam L (Density change), the reinforcing layer is formed around the portion irradiated with the laser beam L. The effect of forming the reinforcing layer on the cut side 12 of the tempered glass cell can be obtained by irradiating the laser beam L to the edge portion adjacent to the cut side 12 of the tempered glass cell.

It is preferable that the laser beam L irradiated to the edge portion of the upper surface 11 of the tempered glass cell has a picosecond pulse width or a femtosecond pulse width. When the cut side face 12 of the tempered glass cell 10 is reinforced by using the laser beam L output from the laser having a short pulse width, the shape or length of the movement path of the laser beam L is It is easy to control.

Generally, when the laser beam L outputted from a laser having a long pulse width is moved, a photothermal reaction occurs inside the tempered glass cell 10 irradiated with the laser beam L, and it is difficult to control the moving direction and the length. However, when a photochemical reaction in which the laser beam L having a pulse width shorter than the thermal diffusion time of the material forming the tempered glass cell 10 is irradiated to the tempered glass cell 10 to break the bond between the molecules is used as a main mechanism , The side strengthening step S120 of the tempered glass cell 10 can be effectively performed while easily controlling the shape and length of the movement path of the laser beam L. [

It is preferable that the position of the laser beam L irradiated on the edge portion of the upper surface 11 of the tempered glass cell is located as close as possible to the cut side surface 120. The position of the laser beam L irradiated with the laser beam L In order to prevent the problem that the edge portion of the reinforced glass cell 10 is damaged due to the formation of the reinforcing layer with respect to the side surface 12, the laser beam L is positioned as close as possible to the cut side surface 12 In Fig. 1, "1" is the line 1 of the laser beam to be moved, and shows the position of the laser beam irradiated on the edge portion of the upper surface 11 of the tempered glass cell.

Referring to FIG. 2, the irradiation mode of the laser beam L can be changed by adjusting the switching frequency of the laser beam L. The laser beam irradiated to the tempered glass cell 10 can be irradiated in a continuous straight line shape (L1) or a plurality of point shapes (L2) spaced apart at a constant interval. As shown in Fig. 2A, when the switching frequency is increased, the laser beam L can be irradiated so as to have a continuous straight line shape L1. 2 (a), the laser beam L is shown as a continuous straight line shape (L1), but substantially a plurality of point-shaped laser beams overlap each other and appear as a continuous straight line shape L1 as a whole. On the other hand, as shown in FIG. 2 (b), when the switching frequency is lowered, the laser beam L can be irradiated to have a plurality of point shapes (L2) spaced apart at regular intervals.

In the side strengthening step (S120) of this embodiment, the number of times of irradiating the laser beam (L) on the upper surface (11) of the tempered glass cell can be adjusted. The reinforcing layer can be formed on the cut side face 12 of the tempered glass cell by irradiating the laser beam L only once on the line to be moved 1 and can be formed at the same position The laser beam L may be irradiated repeatedly a plurality of times to form the reinforcing layer on the cut side 12 of the reinforced glass cell.

In the side reinforcing step S120 of this embodiment, the width of the reinforcing layer formed inside the tempered glass cell 10 can be adjusted. As described above, the laser beam L is repeatedly irradiated once or plural times to the same position as the position where the laser beam L was initially irradiated to form a relatively thin reinforcing layer in the reinforced glass cell 10 As shown in FIG. 3, the laser beams L3 and L4 are irradiated a plurality of times while moving the laser beam L at predetermined intervals along the horizontal direction from the position where the laser beam L was first irradiated, A reinforcing layer having a relatively wide width may be formed inside the cell 10.

Although FIG. 3 shows that the laser beams L3 and L4 are irradiated twice, the width of the reinforcing layer can be further increased by increasing the number of times of irradiation of the laser beam by three or more times, and the moving distance d1 of the laser beam To adjust the width of the reinforcing layer.

In the side strengthening step S120 of this embodiment, the process of forming the reinforcing layer in the tempered glass cell 10 may be changed. One method is to fix the focal position of the laser beam L and move the laser beam L along the edge of the tempered glass cell 10 as shown in FIG. At this time, the focus position of the laser beam L may be formed in the upper surface 11 of the tempered glass cell or inside the tempered glass cell 10.

4, the laser beam L is moved along the edge portion of the tempered glass cell 10 while moving the focal position of the laser beam L along the thickness direction of the tempered glass cell 10, ) Can be irradiated plural times. The laser beam L can be irradiated while moving the focus position of the laser beam L along the thickness direction of the tempered glass cell 10 if the propagation speed of change in physical properties of the glass material is not fast within the tempered glass cell 10 have.

The laser irradiation unit 20 is moved so that the focus position is formed at the first depth d2 from the upper surface 11 of the tempered glass cell and then the laser beam L is irradiated to form the second The laser irradiation unit 20 is moved again so that the focus position is formed at the depth d3, and then the laser beam L is irradiated. By moving the focal position of the laser beam L, the formation speed of the reinforcing layer can be increased.

As a means for moving the laser irradiation unit 20, a linear motor, a configuration in which a rotary motor and a ball screw are combined, or the like can be used.

Fig. 5 is a view showing a modification of the method of manufacturing the tempered glass cell of Fig. 1. Fig. In Fig. 5, the members denoted by the same reference numerals as those shown in Figs. 1 to 4 have the same configuration and function, and a detailed description thereof will be omitted.

Referring to FIG. 5, a method of manufacturing a tempered glass cell according to this modification includes a cell placement step S110, a side strengthening step S120, a cell rotation step S130, a second side enhancement step S140, .

The cell placement step S110 and the side enhancement step S120 are the same as those of the embodiment shown in FIG. 1, and thus detailed description thereof will be omitted.

The cell rotating step S130 rotates the tempered glass cell 10 so that the upper surface 11 and the lower surface 13 of the tempered glass cell are inverted. If it is not possible to form a sufficient strengthening layer on the cut side 12 of the tempered glass cell by simply irradiating the laser beam L onto the upper face 11 of the tempered glass cell, And rotates the tempered glass cell 10 to alternately irradiate the lower surface 13 with the laser beam L. [

The cell rotating step (S130) of the present embodiment can be implemented by a rotary pneumatic cylinder for adsorbing the reinforced glass cell 10 and rotating it by 180 degrees, a rotary motor, or the like.

The second side strengthening step S140 may include a step of irradiating the laser beam L to the edge of the lower surface 13 of the tempered glass cell and moving the laser beam L along the edge of the tempered glass cell 10, To strengthen the cut side 12 of the cell.

The second side enhancement step S140 of this modification differs from the side enhancement step S120 only in that the position where the laser beam L is irradiated is the lower face 13 of the tempered glass cell, And therefore, a detailed description thereof will be omitted.

FIG. 6 is a schematic view illustrating a method of manufacturing a tempered glass cell according to another embodiment of the present invention. FIG. 7 is a cross-sectional view illustrating a method of manufacturing the tempered glass cell of FIG. FIG. 2 is a view showing a case of irradiating while moving. 6 and 7, members denoted by the same reference numerals as those shown in Figs. 1 to 5 have the same configuration and function, and a detailed description thereof will be omitted.

Referring to FIGS. 6 and 7, the manufacturing method of the tempered glass cell according to the present embodiment includes a cell placement step S210 and a side strengthening step S220.

The cell placement step S210 arranges the tempered glass cell 10 such that the laser beam L is irradiated on the side surface 12 of the tempered glass cell cut from the tempered glass plate. The cell arrangement step S210 of this embodiment differs from the cell arrangement step S110 shown in FIG. 1 only in that the surface arranged to face the laser beam L is the side surface 12 of the tempered glass cell, And the rest are substantially the same, so detailed description is omitted.

The side strengthening step S220 may include the step of irradiating the cut side 12 of the tempered glass cell with a laser beam L and moving the laser beam L along the edge of the tempered glass cell 10, Strengthen the cut side 12.

In the side strengthening step S220 of this embodiment, the irradiation type of the laser beam L can be changed by adjusting the switching frequency of the laser beam L. [ 2, the laser beam irradiating the side surface 12 of the tempered glass cell can be irradiated in a continuous linear shape (L1) or in a plurality of point shapes (L2) spaced apart at regular intervals.

In the side reinforcing step S220 of this embodiment, the number of times of irradiating the cut side surface 12 of the tempered glass cell with the laser beam L can be adjusted. It is possible to irradiate the cut side 12 of the tempered glass cell along the edge of the tempered glass cell 10 only once with the laser beam L to form a strengthened layer on the cut side 12 of the tempered glass cell, The reinforcing layer may be formed on the cut side 12 of the reinforced glass cell by irradiating the laser beam L repeatedly a plurality of times at the same position as the position where the laser beam L was initially irradiated.

In the side reinforcing step S220 of the present embodiment, the width of the reinforcing layer formed inside the reinforcing glass cell 10 can be adjusted. As described above, the laser beam L is repeatedly irradiated once or plural times to the same position as the position where the laser beam L was initially irradiated to form a relatively thin reinforcing layer in the reinforced glass cell 10 7, the laser beam L is irradiated a plurality of times while moving the focal position of the laser beam L toward the central portion of the tempered glass cell 10, A relatively wide reinforcing layer may be formed.

The laser irradiation unit 20 is first moved so that the focal position is formed at the third depth d4 from the reinforced glass cell side face 12 and then the laser beam L is irradiated to form the fourth The laser irradiation unit 20 is moved again so that the focus position is formed at the depth d5, and then the laser beam L is irradiated. The width at which the reinforcing layer is formed can be adjusted by moving the focal position of the laser beam L toward the central portion of the tempered glass cell 10. [

The method of manufacturing a tempered glass cell according to the present invention as constructed as described above eliminates the need for a manual polishing process on the cut side of the tempered glass cell by reinforcing the cut side of the tempered glass cell using a laser beam The production yield of the tempered glass cell can be remarkably improved and the crack can be prevented from propagating into the tempered glass cell and the quality of the product can be improved.

In addition, the method of manufacturing a tempered glass cell according to the present invention configured as described above can improve the shape and length of the path of movement of the laser beam by reinforcing the cut side of the tempered glass cell by using a laser beam having a short pulse width An effect of effectively performing the tempering process of the tempered glass cell can be achieved while being easily controlled.

According to another aspect of the present invention, there is provided a method of manufacturing a tempered glass cell, comprising the steps of: irradiating a laser beam a plurality of times while moving the laser beam along a horizontal direction, or moving a focus position toward a central portion of the tempered glass cell, By effecting the irradiation a plurality of times, it is possible to obtain various effects that the width of the reinforcing layer for reinforcing the cut side of the reinforced glass cell can be variously realized.

According to another aspect of the present invention, there is provided a method of manufacturing a tempered glass cell, comprising the steps of: irradiating a laser beam a plurality of times while moving a focus position of the laser beam along a thickness direction of the tempered glass cell, It is possible to obtain an effect that the speed at which the reinforcing layer is formed in the reinforced glass cell can be increased by irradiating the bottom surface with the laser beam alternately.

The scope of the present invention is not limited to the above-described embodiments and modifications, but can be implemented in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

10: Tempered glass cell
11: Top surface of the tempered glass cell
12: side of the tempered glass cell
S110: cell placement step
S120: Side strengthening step

Claims (9)

A cell disposing step of disposing the tempered glass cell so that a laser beam is irradiated onto an upper surface of the tempered glass cell cut from the tempered glass plate; And
And a side strengthening step of irradiating a laser beam to the upper edge of the tempered glass cell and strengthening the cut side of the tempered glass cell while moving the laser beam along the edge of the tempered glass cell,
Wherein the side reinforcing step irradiates the laser beam a plurality of times while moving the laser beam along the horizontal direction from a position where the laser beam is first irradiated. A cell disposing step of disposing the tempered glass cell so that a laser beam is irradiated on a side surface of the tempered glass cell cut from the tempered glass plate; And
A side strengthening step of irradiating a side of the tempered glass cell with a laser beam and strengthening the cut side of the tempered glass cell while moving a laser beam along an edge of the tempered glass cell,
Wherein the laser beam is irradiated a plurality of times while moving the focal position of the laser beam toward the central portion of the tempered glass cell. delete delete delete delete delete A cell disposing step of disposing the tempered glass cell so that a laser beam is irradiated onto an upper surface of the tempered glass cell cut from the tempered glass plate; And
And a side strengthening step of irradiating a laser beam to the upper edge of the tempered glass cell and strengthening the cut side of the tempered glass cell while moving the laser beam along the edge of the tempered glass cell,
Wherein the side reinforcing step irradiates the laser beam a plurality of times while moving the focal point of the laser beam along the thickness direction of the tempered glass cell. delete
KR1020130049928A 2013-05-03 2013-05-03 Method for manufacturing tempered glass cell KR101505470B1 (en)

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KR101698878B1 (en) * 2015-07-08 2017-01-23 주식회사 이오테크닉스 Method for cutting glass workpiece
EP3519366B1 (en) * 2016-09-29 2022-10-19 Corning Incorporated Compositional modification of glass articles through laser heating and methods for making the same
WO2020262293A1 (en) * 2019-06-27 2020-12-30 Ａｇｃ株式会社 Tempered glass plate and method for producing same
JP2022123155A (en) * 2019-06-27 2022-08-24 Ａｇｃ株式会社 Strengthened glass plate and manufacturing method of the same
KR102652103B1 (en) * 2020-07-15 2024-03-29 엘지전자 주식회사 Method of manufacturing a cover glass

Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2002012436A (en) * 2000-06-23 2002-01-15 Nippon Sheet Glass Co Ltd Method of treating glass plate end and plate glass treated thereby
JP2003286048A (en) * 2002-03-27 2003-10-07 Okamoto Glass Co Ltd Method for manufacturing tempered glass
JP2010099708A (en) * 2008-10-24 2010-05-06 Japan Steel Works Ltd:The Method and apparatus for processing cut surface of cut material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002012436A (en) * 2000-06-23 2002-01-15 Nippon Sheet Glass Co Ltd Method of treating glass plate end and plate glass treated thereby
JP2003286048A (en) * 2002-03-27 2003-10-07 Okamoto Glass Co Ltd Method for manufacturing tempered glass
JP2010099708A (en) * 2008-10-24 2010-05-06 Japan Steel Works Ltd:The Method and apparatus for processing cut surface of cut material

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