KR20170034096A - Method for bending of glass and tempered glass using laser - Google Patents

Method for bending of glass and tempered glass using laser Download PDF

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Publication number
KR20170034096A
KR20170034096A KR1020150132346A KR20150132346A KR20170034096A KR 20170034096 A KR20170034096 A KR 20170034096A KR 1020150132346 A KR1020150132346 A KR 1020150132346A KR 20150132346 A KR20150132346 A KR 20150132346A KR 20170034096 A KR20170034096 A KR 20170034096A
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heating
laser
chamber
glass
temperature
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KR1020150132346A
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Korean (ko)
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KR102002363B1 (en
Inventor
전은숙
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주식회사 레이저앱스
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Priority to KR1020150132346A priority Critical patent/KR102002363B1/en
Publication of KR20170034096A publication Critical patent/KR20170034096A/en
Priority to KR1020170137755A priority patent/KR102270530B1/en
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/025—Re-forming glass sheets by bending by gravity
    • C03B23/0258—Gravity bending involving applying local or additional heating, cooling or insulating means
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/025—Re-forming glass sheets by bending by gravity
    • C03B23/0256—Gravity bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces
    • 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)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

The present invention relates to a method of bending a glass and a tempered glass using a laser, and a method using a laser has a disadvantage in that it takes a long time to raise the temperature from the temperature in the chamber to the processing temperature. The present invention relates to a method and apparatus for preheating by a chamber and a jig, locally heating by using a heating lamp, rapidly heating a local heating by using a laser, The laser can be projected in a precise heating area by projecting the laser using a laser 3D scanner. The laser can be heated quickly. Scanning method is used instead of mechanical movement and it is installed outside the chamber to extend the life and accuracy. To improve product quality, and to be applied to mass production facilities.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of bending glass and tempered glass using laser,

The present invention relates to a glass and tempered glass bending apparatus and method using a laser, and more particularly, to a glass and tempered glass bending apparatus and method using laser as a heat source for bending a cover glass of a smart phone, And annealing them while bending them by heating them locally and heating them to a processing temperature quickly.

The cover glass of the smartphone uses a tempered glass having a high impact resistance and a high light transmittance. Currently, the coverglass of the smartphone uses the banding process on the edge portion (edge portion) of the design trend.

The edges (edge portions) of the cover glass are curved using a thermoforming machine to form curved surfaces of the tempered glass.

In a conventional method using a thermoforming machine, the entire glass is heated in a high-temperature furnace, and then the upper and lower molds are formed to form a bending shape.

However, in the conventional thermoforming method, haze phenomenon occurs in the upper and lower surfaces where the mold is in contact with the glass during the process of melting the entire glass and then dipping the mold into a mold (mold). In order to recover this, (polishing) to produce products.

Therefore, there is a problem that the manufacturing cost is increased, and the mass production yield is reduced to about 30%. Also, since the entire glass is melted at a high temperature, the dimensional change of the glass is so large that resizing is required after molding, and a ripple phenomenon occurs on the glass surface.

On the other hand, Korean Patent Laid-Open Publication No. 10-2014-0045006 discloses a curved surface molding apparatus for tempered glass for a touch screen panel and a molding method thereof. The prior art includes a tempered glass support portion in a chamber, and a sensor portion for controlling the laser supply portion and the pressing portion and the pressing portion.

In this prior art, basic heating is performed at 200 to 300 ° C in the chamber, the edge portion of the tempered glass is locally heated in the laser supply portion, and then pressed by the pressing portion. However, in order to press the edges of the glass and tempered glass to bend, it is necessary to heat the glass to about 750 ° C. However, the heating time required to raise the temperature to more than 750 ° C at a temperature of 200 to 300 ° C is required.

In addition, since a method of bending by pushing with a pressing portion is adopted, there is a problem that a top portion of the tempered glass and a portion pressed by the pressing portion are puffed out (hazy).

The laser supply part of the prior art is configured to heat the heating area while reciprocally moving the laser head along the longitudinal direction of the tempered glass. Even if the laser output is increased, it is difficult to heat the laser head to a desired temperature only once or twice, It is possible to heat to the desired temperature only by heating while moving.

Therefore, there is a need for a device for reciprocating the laser head, which requires a long heating time. Since the laser head reciprocating means is used, there is a limit to high-speed movement, and the time from one point to the next There is a disadvantage in that the laser heating efficiency is lowered due to the increase in the interval, so that the heating time is long.

Korean Patent Publication No. 10-2014-0045006 (Apr. 14, 2014)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems and to provide a laser for improving the productivity by shortening the banding process time of the glass and tempered glass by rapidly heating the portion to be formed after the preheating process by the chamber and the jig, And to provide a glass and tempered glass bending apparatus and method using the same.

Further, the present invention is intended to improve the yield by reducing the deterioration phenomenon between the upper surface of the tempered glass and the bending portion by forming the bending processing means using a roller without using a forming mold.

In addition, the present invention is intended to shorten the heating time by rapid heating by a laser scanning method using a laser 3D scanner as a laser means.

The glass and tempered glass bending method using a laser according to the present invention comprises:

A preheating step of preheating the object to be processed by loading the object to be processed into the molding position of the molding jig in a preheated state by driving the heating means of the molding jig provided in the chamber;

A heating step of heating the heating area of the part to be bent by the ramp device and heating the heating area of the part to be bent by using the laser when the object to be processed is loaded;

A forming step of forming an edge of the object to be processed by using a roller forming apparatus when the temperature of the heating area is reached and a preset temperature is reached;

And an annealing step of annealing the formed object to be processed at a predetermined annealing temperature for a predetermined time and then unloading the object to be processed.

In the heating process using the laser,

And a laser is projected from the outside of the chamber to the inside of the chamber to heat the heating region of the portion to be bent.

In the heating process using the laser,

And a heating area of a part to be bent is reciprocated and scanned in the longitudinal direction by using a laser 3D scanner capable of scanning X, Y, and Z axes.

In the heating process using the laser,

The beam profile of the laser 3D scanner and the beam length change are controlled to control the range of the heating zone.

The heating region width of the heating process using the lamp is wider than the heating region width of the heating process using the laser.

The preheating step preheats the entire object at 400 to 600 ° C .; the first heating step using the lamp heats the heating area of the part to be bent to 600 to 700 ° C, And the annealing temperature in the annealing step is annealed at 350 to 400 ° C.

The laser device is characterized by using a line beam optical system.

It is possible to preheat the entire object to be processed which is loaded by the heating means of the chamber and the molding jig and locally heat the portion to be bent by lamp heating and laser heating to quickly raise the processing temperature to the processing temperature by rapid heating, .

Further, according to the present invention, a constant product quality can be secured by local heating using a lamp and a laser, and the entire surface of the chamber can be maintained at a temperature much lower than the processing temperature during molding to prevent surface curvature due to thermal deformation of the product.

In addition, the present invention can smoothly form a curved shape without damaging the surface of a glass or tempered glass product by using a forming roller, and is molded without a strong impact, so that it has an effect of improving the life of a mold, that is, So that breakage of the glass product can be prevented.

The present invention can provide a molding method applicable to a mass production system capable of minimizing post-processing (polishing, re-sizing, reinforcement, etc.) processes and capable of accurate bending margin control and continuous molding.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram of a glass and tempered glass banding apparatus using a laser according to the present invention; FIG.
2 is a control block diagram of a glass and tempered glass bending apparatus using a laser according to the present invention.
3 is a process flow diagram of a glass and tempered glass bending method using a laser according to the present invention.
4 is an explanatory view of a heating process using a laser 3D scanner according to the present invention;
5 is an explanatory view of heating using a line beam optical system according to the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a conceptual diagram of a glass and tempered glass bending apparatus using a laser according to the present invention, FIG. 2 is a control block diagram of a glass and tempered glass bending apparatus using a laser according to the present invention, And a glass-reinforced glass bending method using the same.

As shown in FIG. 3, a glass and tempered glass bending method using a laser according to the present invention includes:

A preheating step (S10) of preheating the object to be processed by loading the object to be processed in the molding position of the molding jig in a preheated state by driving the heating means of the molding jig provided in the chamber;

A heating step (S20) of heating a heating area of a part to be bent by a ramp device and heating a heating area of the heating area to be bent using a laser when the object to be processed is loaded;

A forming step (S30) of forming an edge of the object to be processed by using a roller forming apparatus when the temperature of the heating area is reached and a preset temperature is reached;

And an annealing step (S40) in which the formed object is moved to an enering chamber, annealed at a predetermined annealing temperature for a predetermined time, and then unloaded to the outside.

In the tempering glass bending method according to the present invention as described above, the entire object to be processed is preheated at a predetermined temperature by the preheating step (S10), and the portion to be bent, that is, the edge portion is heated by the lapping apparatus, So that only the corresponding bending area, that is, the heating area, is partially rapidly heated, and then the wafer is formed into a foaming roller and moved to the annealing chamber, followed by unloading after annealing.

In the preheating step, the entire object is preheated at 400 to 600 ° C .; the first heating step using the lamp heats the heating area of the part to be bent to 600 to 700 ° C, The annealing temperature in the annealing step is annealed at 350 to 400 ° C.

1, a molding jig 20 is installed in a chamber 10 and heating means 11 and 21 are installed in a chamber 10 and a molding jig 20, respectively, Under the control of the controller 100, the preheating is performed. That is, the chamber 10 and the heating means 11 and 21 of the jig 20 are driven to preheat to a proper preheating temperature, and then, through the loading and unloading device 70, The object 1 is loaded into the forming position.

The object 1 is sucked through the plurality of suction holes 22 communicated with the upper surface of the molding jig 20 and fixed to the loading position when the object 1 is loaded on the upper portion of the molding jig 20 . This is because the suction force is generated through the intake hole 22 by using the vacuum adsorber and the object 10 is fixed to the molding position.

The heating means 11 of the chamber 10 and the heating means 21 of the jig 20 are driven to heat the object 10 to a preheating temperature and at the same time, (30) is driven to partially heat the portion to be bent, that is, the edge portion of the object (1) by using the ramp device (30).

Since the temperature in the chamber 10 is insufficient to preheat the object 1 only by heating the chamber 10, the heating means is built in the molding jig 20 to heat the molding plate (upper surface of the molding jig) .

Thereafter, the lamp device 30 is driven to heat the portion to be bent, that is, the heating region of the edge portion of the object 1 to 600 to 700 占 폚. At the same time, the laser 3D scanner 40 is driven to rapidly heat the heating region to the processing temperature, that is, 750 to 1000 ° C.

This takes a long time to heat the corresponding heating region from the laser only to the processing temperature (750 to 1000 ° C) in the preheated state. Therefore, in the present invention, the heating region is rapidly heated before or during laser heating by using a heating lamp.

The heating region heated by the lamp unit 30 does not heat the entirety of the object 1 but partially heats the edge portion of the object 1 to be bent. The lamp unit 30 is provided on both sides in the longitudinal direction of the heating lamp to match the length of the object 1 to heat the heating region.

In the present invention, the 3D laser scanner 40 is installed outside the chamber 10, and the laser viewing window 12 is installed in the chamber 10.

It is difficult to solve the heat dissipation problem of the laser device when the laser device is installed in the chamber because the inside temperature of the chamber is high and there is a problem that it causes a malfunction due to high temperature influence on the operation device such as scanning have. Accordingly, the present invention is characterized in that a laser is projected from the outside of the chamber 10 to the inside of the chamber 10 through the viewing window 12 of the chamber to heat the heating region of the portion to be bent.

Here, the lasers usable in the present invention include a CO2 laser, an IR laser, and a diode laser. The CO2 laser is a surface heating type that is absorbed 100% on a glass surface. A diode (wavelength of 800 to 940 nm) The IR (1 ~ 2um) laser has the advantage of making the internal quality of the glass uniform by allowing the energy remaining in the glass surface absorption rate of 10% to be transmitted to the lower part, allowing volume heating.

In the present invention, as shown in FIG. 4,

The heating area of the portion to be bent is reciprocated and scanned in the longitudinal direction by using the laser 3D scanner 40 capable of scanning the X, Y and Z axes.

In order to heat a heating region of a predetermined width on both sides of the object 1 with a laser, a laser beam must be reciprocated several times to project the laser. Accordingly, in the present invention, a laser 3D scanner 40 is provided to project a laser by reciprocating scanning at a high speed with respect to a heating area.

The laser 3D scanner 40 of the present invention can simultaneously heat both edges and can scan in the X, Y, and Z directions using a CO 2 laser, an IR laser, a diode laser (wavelength 700 nm to 11000 nm) A uniform beam profile can be obtained, and the beam length variation can be controlled.

The heating zone width of the heating process using the lamp unit 30 is wider than the heating zone width of the heating process using the laser. Of course, heating can be done in the same heating zone, but lamp heating is difficult to adjust the width accurately, so heating to a wider range of heating zones and laser heating can control the range of precise heating zones, To be heated.

On the other hand, in the present invention, as shown in Fig. 5,

The laser provided in the laser 3D scanner 40 is characterized by being a line beam optical system. As shown in FIG. 5, when the line beam is used, the length of the focal point of the line beam is adjusted to be equal to the length of the object to be processed so that the line beam can be simultaneously projected in the longitudinal direction. As a result, it is possible to quickly heat the desired heating area only by scanning in the lateral direction (X direction) and up and down direction (Z direction) without scanning in the longitudinal direction (Y direction).

When the appropriate processing temperature is reached by performing laser local heating using the laser 3D scanner 40 in addition to the local heating using the ramp device 30 as described above, the roller forming device 50 is driven to rotate the object 1, .

Since the forming process uses a roller, the object 1 can be softly formed into a curved shape without impact. In addition, since the local heating is performed, the localized heating portion can be easily bent and the stress or deterioration of the portion other than the bending portion of the object to be processed can be prevented.

Thereafter, the controller 100 moves the formed object to the annealing chamber, anneals it in advance in the annealing chamber at a predetermined annealing temperature for a predetermined time, unloads the processed object to the outside of the chamber, finishes processing of one object to be processed do. The annealing chamber refers to an annealing chamber in which a chamber region in which a jig is installed and is held adjacent to a chamber region (processing chamber) forming the object to be processed and the temperature is set at an annealing temperature.

As described above, according to the present invention, the entire object to be processed, which is loaded by the heating means of the chamber and the molding jig, is preheated, and the portion to be bent by the lamp heating and the laser heating is locally heated, rapidly raised to the processing temperature by rapid heating, Can be shortened. Further, according to the present invention, a constant product quality can be secured by local heating using a lamp and a laser, and the entire surface of the chamber can be maintained at a temperature much lower than the processing temperature during molding to prevent surface curvature due to thermal deformation of the product. In addition, the present invention can smoothly form a curved shape without damaging the surface of a glass or tempered glass product by using a forming roller and form a mold without a strong impact, thereby improving the life of the mold, that is, the molding jig, So that breakage of the glass product can be prevented. As described above, the present invention can provide a molding method applicable to a mass production system capable of minimizing post-processing (polishing, re-sizing, strengthening, and the like), which is a problem of the prior art, .

1: object to be processed 10: chamber
11: chamber heating means 12: laser sight window
20: forming jig 21: jig heating means
22: intake hole 30: lamp unit
40: laser 3D scanner 50: roller forming device
60: loading / unloading apparatus 100: controller
110: Temperature detection device

Claims (7)

In glass and tempered glass bending processes,
A preheating step (S10) of preheating the object to be processed by loading the object to be processed in the molding position of the molding jig in a preheated state by driving the heating means of the molding jig provided in the chamber;
A heating step (S20) of heating a heating area of a part to be bent by a ramp device and heating a heating area of the heating area to be bent using a laser when the object to be processed is loaded;
A forming step (S30) of forming an edge of the object to be processed by using a roller forming apparatus when the temperature of the heating area is reached and a preset temperature is reached;
And an annealing step (S40) of transferring the formed object to an annealing region, annealing the annealed object at a predetermined annealing temperature for a predetermined time, and unloading the object to the outside of the chamber.
The method according to claim 1, wherein the heating using the laser in the heating step comprises:
Wherein a laser window is formed in the chamber and a laser is projected from the outside of the chamber to the inside of the chamber through the laser window so as to heat the heating region of the portion to be bent of the object.
The method according to claim 1, wherein the heating using the laser in the heating step comprises:
A method for bending glass and tempered glass using a laser, characterized in that a heating area of a part to be bent is reciprocated and heated in a longitudinal direction by using a laser 3D scanner capable of X, Y and Z axis scanning.
The method according to claim 3, wherein the heating using the laser in the heating step comprises:
Wherein the beam profile of the laser 3D scanner and the beam length change are controlled to control the range of the heating zone.
The method according to claim 1,
Wherein the heating region width of the heating process using the lamp is wider than the heating region width of the heating process using the laser.
The laser irradiation method according to claim 1,
And a line beam optical system is used.
The method according to claim 1,
The preheating step preheats the entire object at 400 to 600 ° C .; the first heating step using the lamp heats the heating area of the part to be bent to 600 to 700 ° C, Wherein the heating region of the portion to be annealed is heated to 750 to 1000 占 폚 and the annealing temperature is annealed to 350 to 400 占 폚.
KR1020150132346A 2015-09-18 2015-09-18 Method for bending of glass and tempered glass using laser KR102002363B1 (en)

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KR1020170137755A KR102270530B1 (en) 2015-09-18 2017-10-23 Method for bending of glass and tempered glass using laser

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111268895A (en) * 2020-02-13 2020-06-12 广东华中科技大学工业技术研究院 Glass hot bending device and method based on laser shaping and orientation assistance
CN112876048A (en) * 2021-02-10 2021-06-01 福建省万达汽车玻璃工业有限公司 Semi-tempered glass forming method and forming auxiliary mechanism
KR20230078011A (en) * 2021-11-26 2023-06-02 주식회사 싸이텍 Minimum contact type C glass molding device and A method of manufacturing C-type glass using this

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009297759A (en) * 2008-06-16 2009-12-24 Shibaura Mechatronics Corp Laser bonding method and laser machining apparatus
KR101206328B1 (en) * 2010-02-22 2012-12-04 (주)대호테크 Cover glass manufacturing device
KR20140045006A (en) 2012-10-05 2014-04-16 크루셜텍 (주) Apparatus and method for curvature forming of tempered glass for touch screen panel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009297759A (en) * 2008-06-16 2009-12-24 Shibaura Mechatronics Corp Laser bonding method and laser machining apparatus
KR101206328B1 (en) * 2010-02-22 2012-12-04 (주)대호테크 Cover glass manufacturing device
KR20140045006A (en) 2012-10-05 2014-04-16 크루셜텍 (주) Apparatus and method for curvature forming of tempered glass for touch screen panel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111268895A (en) * 2020-02-13 2020-06-12 广东华中科技大学工业技术研究院 Glass hot bending device and method based on laser shaping and orientation assistance
CN111268895B (en) * 2020-02-13 2022-06-28 广东华中科技大学工业技术研究院 Glass hot bending device and method based on laser shaping and orientation assistance
CN112876048A (en) * 2021-02-10 2021-06-01 福建省万达汽车玻璃工业有限公司 Semi-tempered glass forming method and forming auxiliary mechanism
CN112876048B (en) * 2021-02-10 2022-09-20 福建省万达汽车玻璃工业有限公司 Semi-tempered glass forming method and forming auxiliary mechanism
KR20230078011A (en) * 2021-11-26 2023-06-02 주식회사 싸이텍 Minimum contact type C glass molding device and A method of manufacturing C-type glass using this

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