KR102270530B1 - Method for bending of glass and tempered glass using laser - Google Patents

Abstract

The present invention relates to a method and apparatus for bending glass and tempered glass using a laser. Conventionally, the method using a laser has a disadvantage in that it takes a lot of time because it is necessary to raise the temperature of the object to be processed from the temperature in the chamber to the processing temperature.
The present invention preheats by means of a chamber and a jig, performs local heating using a heating lamp, and rapidly heats the local heating using a laser to increase the part to be bent to the processing temperature in a short time to shorten the molding time. And by projecting the laser in a scanning method using a laser 3D scanner, the laser can be projected on the accurate heating area and heated quickly. It uses a scanning method rather than a mechanical movement and installs it outside the chamber to prolong life and increase accuracy. It is a glass and tempered glass bending method and apparatus that improves product quality and can be applied to mass production facilities.

Description

Glass and tempered glass bending method using a laser {Method for bending of glass and tempered glass using laser}

The present invention relates to an apparatus and method for bending glass and tempered glass using a laser, and more particularly, as a heat source for bending processing of a cover glass of a smartphone, preheating with a heating means of a chamber and a jig, and using a lamp and a laser It relates to a glass and tempered glass bending method using a laser, which is heated to a processing temperature by local heating and annealed while bending.

The cover glass of smart phone uses tempered glass with strong impact resistance and high light transmittance. Currently, for cover glass of smart phone, banding is applied to the edge part (edge part) according to the design trend.

To form a curved surface of the tempered glass, the edge (edge part) of the cover glass is curved using a thermoforming machine.

The conventional method of using a thermoforming machine is to heat the entire glass in a high-temperature furnace, and then use an upper and lower mold to form a bending shape.

However, in the conventional thermoforming method, a phenomenon occurs in which the glass is hazy on the upper and lower surfaces of the mold in contact with the mold (mold) after melting the entire glass, and polishing is performed in a later process to restore it. (polishing) is in progress to produce the product.

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

On the other hand, as a prior art, Korean Patent Application Laid-Open No. 10-2014-0045006 discloses an apparatus for forming a curved surface of tempered glass for a touch screen panel and a method for forming the same. The prior art is configured to install a tempered glass support in the chamber, and to include a laser supply unit, and a sensor unit for controlling the pressing unit and the pressing unit operation.

Such a prior art is to perform basic heating at 200 ~ 300 ℃ in the chamber, and after local heating of the edge portion of the tempered glass in the laser supply unit, press with a press to form. However, in order to press and bend the edge portion of the glass and tempered glass, it is necessary to heat it to about 750°C, but it takes a lot of heating time to raise the temperature from 200 to 300°C to 750°C or more with the laser alone, resulting in poor productivity.

In addition, since a method of bending by pressing with a pressing part is adopted, a phenomenon in which the upper surface of the tempered glass and the part pressed by the pressing part are hazy occurs, so there is a problem that a polishing process to restore it must be added.

In addition, the laser supply unit of the prior art is configured to heat the heating region while reciprocating the laser head in the longitudinal direction of the tempered glass. Even if the laser output is increased, it is difficult to heat to a desired temperature with only one or two reciprocations. It can be heated to the desired temperature only by heating while moving.

Therefore, it takes a lot of heating time, requires a device for reciprocating the laser head, and there is a limit to high-speed movement because the laser head reciprocating means is used. The longer the interval, the lower the laser heating efficiency, so it takes a lot of heating time.

Korean Patent Publication No. 10-2014-0045006 (2014.04.16)

The present invention is a laser that improves productivity by reducing the bending processing time of glass and tempered glass by rapidly heating the part to be molded with a lamp and a laser after undergoing a preheating process by a chamber and a jig by improving the above problems. To provide a glass and tempered glass bending apparatus and method used.

In addition, the present invention is to improve the yield by reducing the deterioration phenomenon between the upper surface of the tempered glass and the bending portion by forming using a roller without using a molding die as a bending processing means.

In addition, the present invention is to reduce the heating time by rapidly heating in a laser scanning method using a laser 3D scanner as a laser means.

Glass and tempered glass bending method using a laser according to the present invention,

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

a heating process of heating the heating region of the portion to be bent by using a laser while heating the heating region of the portion to be bent when the object to be processed is loaded;

a forming process of forming an edge of the object to be processed using a roller forming device when the temperature of the heating area is checked and a preset temperature is reached;

After annealing the formed object to be processed at a preset annealing temperature for a predetermined time, an annealing process of unloading the object to be processed to the outside;

In the heating process,

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

The laser used in the heating process is,

line beam optics,

In the preheating process, the entire object is preheated to 400 ~ 600℃, and in the heating process using a lamp device during the heating process, the heating area of the part to be bent is heated to 600 ~ 700℃, and the heating process using the laser In, the heating region of the portion to be bent is heated to 750 ~ 1000 ℃, in the annealing process, characterized in that the annealing at 350 ~ 400 ℃.

The heating process using the laser,

It is characterized in that the heating area of the part to be bent is heated by projecting a laser into the chamber from the outside of the chamber.

The heating process using the laser,

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

The heating process using the laser,

It is characterized in that the range of the heating area is controlled by controlling the beam profile of the laser 3D scanner and the change in the beam length.

The effect of shortening the molding time by preheating the entire processing object loaded by the heating means of the chamber and the molding jig, heating the part to be bent by lamp heating and laser heating, and quickly raising the processing temperature through rapid heating there is

In addition, the present invention can secure a certain product quality by performing local heating using a lamp and a laser, and maintain the overall temperature in the chamber much lower than the processing temperature during molding to block the problem of surface curvature due to thermal deformation of the product.

In addition, the present invention can form a curved shape smoothly without damaging the surface of glass and tempered glass products using a forming roller, and because it is formed without a strong impact, there is an effect of improving the life of the mold, that is, the forming fabric, and reducing stress due to annealing. This can help prevent breakage of glassware.

The present invention can minimize the post-processing (polishing, resizing, strengthening, etc.) process, which is a problem in the prior art, and can provide a molding method applied to a mass production system that can control a bending margin accurately and can continuously mold.

1 is a conceptual configuration diagram of a glass and tempered glass bending device using a laser according to the present invention.
2 is a control block diagram of a glass and tempered glass bending device using a laser according to the present invention.
3 is a process diagram of a glass and tempered glass bending method using a laser according to the present invention.
4 is an explanatory diagram 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.

1 is a conceptual block 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 FIG. 3 is a laser according to the present invention It is a process diagram of a glass and tempered glass bending method using

Glass and tempered glass bending method using a laser according to the present invention, as shown in Figure 3,

A preheating process (S10) of preheating the processing object by loading the processing object into the molding position of the molding jig in a state of being preheated by the heating means of the chamber and the heating means of the molding jig installed in the chamber;

a heating process (S20) of heating the heating region of the portion to be bent by using a laser while heating the heating region of the portion to be bent when the object to be processed is loaded by a lamp device;

When the temperature of the heating zone is checked and a preset temperature is reached, a forming process (S30) of forming the edge of the object to be processed using a roller forming device;

and an annealing process (S40) of moving the formed object to an annealing chamber, annealing it at a preset annealing temperature for a predetermined time, and then unloading it to the outside.

In the tempered glass bending method according to the present invention as described above, the whole object is preheated to a predetermined temperature by the preheating process (S10), and the portion to be bent, that is, the edge portion is heated with a lapping device and heated with a laser device. This is a method in which only the bending area, that is, the heating area, is partially rapidly heated, then formed with a forming roller, moved to an annealing chamber, and unloaded after annealing.

In the present invention, the preheating process preheats the entire object to 400 ~ 600℃, the first heating process using the lamp heats the heating area of the part to be bent to 600 ~ 700℃, the second heating The process is characterized in that the heating region of the part to be bent is heated to 750 ~ 1000 °C, and the annealing temperature of the annealing process is annealed to 350 ~ 400 °C.

In the present invention, as shown in FIG. 1 , a forming jig 20 is installed in the chamber 10 , and heating means 11 and 21 are installed in the chamber 10 and the forming jig 20 respectively, and the controller It is preheated to the preheating temperature under the control of (100). That is, the upper surface of the forming jig 20 is normally preheated to an appropriate preheating temperature by driving the chamber 10 and the heating means 11 and 21 of the jig 20 through the loading and unloading device 70 . The workpiece 1 is loaded into the forming position.

When the processing object 1 is loaded on the upper part of the molding jig 20, the processing object 1 is adsorbed through the plurality of intake holes 22 communicating with the upper surface of the molding jig 20 and fixed at the loading position. . In this case, an intake force is generated through the intake hole 22 using a vacuum adsorber, and the object 1 to be processed is fixed at the molding position.

When the object 1 is fixed and loaded at the forming position, the heating means 11 of the chamber 10 and the heating means 21 of the jig 20 are driven to heat to a preheating temperature, and a lamp device By driving (30), a portion to be bent, that is, an edge portion of the object (1) to be processed is partially heated using the lamp device (30).

In the present invention, since the temperature in the chamber 10 alone is insufficient to preheat the processing object 1, a heating means is built in the molding jig 20 to heat the molding plate (upper surface of the molding jig) to heat the processing object 1 to preheat.

Then, by driving the lamp device 30, the portion to be bent, that is, the heating region of the edge portion of the processing object 1 is heated to 600 ~ 700 ℃. At the same time, the laser 3D scanner 40 is driven to rapidly heat the heating area to a processing temperature, that is, 750 to 1000°C.

This takes a lot of time to heat the heating area to the processing temperature (750 ~ 1000 ℃) only with the laser in the preheating state. Therefore, in the present invention, the heating area is rapidly heated by using a heating lamp before or together with laser heating.

The heating region heated by the lamp device 30 does not heat the entire object 1 but partially heats a portion to be bent, that is, an edge portion of the object 1 . The lamp device 30 is installed on both sides in the longitudinal direction in accordance with the length of the object to be processed by heating lamps to heat the heating region.

Meanwhile, in the present invention, a 3D laser scanner 40 is installed outside the chamber 10 , and a laser see-through window 12 is installed in the chamber 10 .

Since the temperature inside the chamber is high, when the laser device is installed and operated inside the chamber, it is difficult to solve the heat dissipation problem of the laser device, and the high temperature affects the operation driving device such as scanning, so there are problems such as a cause of failure. have. Accordingly, the present invention is characterized in that the heating region of the portion to be bent is heated by projecting a laser from the outside of the chamber 10 into the chamber 10 through the see-through window 12 of the chamber.

Here, the laser usable in the present invention includes a CO2 laser, an IR laser, and a diode laser, and the CO2 laser is 100% absorbed by the glass surface and is a surface heating method, a diode (wavelength 800~940nm) laser and The IR (1~2um) laser has the advantage of making the internal quality of the glass uniform as the remaining energy is transferred to the lower part as the glass surface absorption rate is around 10% and volume heating is possible.

The present invention is a heating process using the laser, as shown in Figure 4,

It is characterized in that the heating area of the part to be bent is reciprocally scanned in the longitudinal direction by using a laser 3D scanner 40 capable of scanning the X, Y, and Z axes.

This requires that the laser beam be projected by reciprocating the laser beam several times in order to heat the heating area having a predetermined width on both sides of the object 1 with the laser. Therefore, in the present invention, the laser is projected by reciprocally scanning the heating area at high speed by installing the laser 3D scanner 40 .

The laser 3D scanner 40 of the present invention can simultaneously heat both edges, and uses a CO ₂ laser, an IR laser, and a diode laser (wavelength 700 nm to 11000 nm), and X, Y, and Z axis direction scanning is possible, A uniform beam profile can be obtained, and a change in beam length can be adjusted.

It is characterized in that the width of the heating region of the heating process using the lamp device 30 is wider than the width of the heating region of the heating process using the laser. Of course, it can be heated in the same heating zone, but since it is difficult to control the exact width of lamp heating, it heats in a wider heating zone, and laser heating can control the precise heating zone, so consider the properties of the bending material. set to heat up.

On the other hand, the present invention, as shown in Figure 5,

The laser installed in the laser 3D scanner 40 is characterized in that it is a line beam optical system. As shown in FIG. 5, when a line beam is used, the length of the focal point of the line beam is adjusted to be the same as the length of the object to be processed, so that the line beam can be projected simultaneously in the longitudinal direction. As a result, it is possible to quickly heat a desired heating region only by scanning in the left-right (X-direction) and vertical (Z-direction) directions 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 as well as local heating using the lamp device 30 as described above, the roller forming device 50 is driven to drive the processing object (1) to form

Since the forming process uses a roller, it is possible to smoothly form a curved shape without applying an impact to the object 1 to be processed. In addition, since the local heating is made, the local heating part can be easily bent, and stress or deterioration applied to other parts than the bending part of the object to be processed can be prevented.

Thereafter, the controller 100 moves the formed object to the annealing chamber and annealed it for a predetermined time at a predetermined annealing temperature in the annealing chamber in advance, then unloads it to the outside of the chamber and ends the processing of one processing object do. The annealing chamber is an annealing chamber that is installed adjacent to a chamber region (processing chamber) in which a jig is installed to form an object to be maintained by setting the temperature to the annealing temperature.

As described above, the present invention preheats the entire processing object loaded by the heating means of the chamber and the molding jig, and locally heats the portion to be bent by lamp heating and laser heating to rapidly increase the processing temperature to the processing temperature for molding time has the effect of shortening the In addition, the present invention can secure a certain product quality by performing local heating using a lamp and a laser, and keep the overall temperature in the chamber much lower than the processing temperature during molding to block the problem of surface curvature due to thermal deformation of the product. In addition, the present invention can form a curved shape smoothly without damaging the surface of glass and tempered glass products using a forming roller, and because it is formed without a strong impact, there is an effect of improving the life of the mold, that is, the forming jig, and reducing stress due to annealing. This will prevent breakage of glassware As such, the present invention can minimize the post-processing (polishing, resizing, strengthening, etc.) process, which is a problem of the prior art, and can provide a molding method applied to a mass production system that can control the bending margin accurately and can continuously mold. .

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

Claims (9)

delete delete delete delete chamber 10;
a forming jig 20 present in the chamber 10 and on which the object 1 is placed;
a plurality of intake holes 22 communicating with the upper surface of the molding jig 20 to adsorb the processing object 1 and fix it in a loading position;
Jig heating means (21) built in the forming jig (20) to heat the object (1) to be processed;
a lamp device 30 installed in the longitudinal direction of the object to be processed to heat only the heating region of the object to be processed (1);
Laser 3D scanner 40 for reciprocally scanning the longitudinal direction of the object to be processed (1);
a roller forming device 50 positioned between the forming jig 20 and the ramp device 30, and forming the object 1 having a heating area heated to a processing temperature using a roller;
Bending device comprising a.
6. The method of claim 5,
The chamber 10 includes a laser viewing window 12 for transmission of the laser beam oscillated from the laser 3D scanner 40;
Bending device, characterized in that.
6. The method of claim 5,
The laser 3D scanner 40 is capable of scanning in x, y, and z-axis directions;
Bending device, characterized in that.
6. The method of claim 5,
The laser 3D scanner 40 has no scanning in the longitudinal direction (y-axis direction) of the object 1;
Bending device, characterized in that.
6. The method of claim 5,
The width of the heating region of the lamp device 20 is wider than the width of the heating region of the laser 3D scanner 40;
Bending device, characterized in that.

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