KR20020078834A - Apparatus and method for manufacturing tempered glass of curved surface - Google Patents

Abstract

PURPOSE: Provided is an apparatus for manufacturing curved tempered glasses with no mechanical stress and thermal stress by bending flat glasses and cooling. Therefore, the apparatus offers curved glasses, 3-19mm of thick, with good optical properties and shortens a manufacturing process. CONSTITUTION: The manufacturing method comprises the parts of: carrying a flat glass put on a curved mold into a furnace(110), wherein the mold, made of heat resistant titanium is covered with rod(15-50mm of thickness)-shaped heat resistant materials and then fine stone powder; forming the flat glass into a curved glass and drawing the formed(curved) glass out of the furnace with a mold conveyor(120) between furnace and cooler; entering the formed glass to a cooler(170) by lifting glass with a carrier(150); and cooling both sides of the flat glass with cold air ejected from the cooler with a curved shape corresponding to the formed glass.

Description

Apparatus and method for manufacturing tempered glass of curved surface

TECHNICAL FIELD The present invention relates to the shaping and cooling of a glass plate, and more particularly, to a curved tempered glass manufacturing apparatus for cooling after bending a flat plate glass in a softened state and a method for manufacturing a curved tempered glass using such a device.

Curved plate glass is used in various fields such as windshield glass, revolving door, or window glass. Curved plate glass is manufactured by bending flat glass, and such bending equipment has been developed and used in various ways.

In general, flat glass having a thickness of about 3mm-19mm is susceptible to impact and is likely to damage the human body because it breaks into large and sharp pieces when broken. Curved tempered glass is not only resistant to impact due to its mechanical properties and its tempering process during bending, but also broken into small pieces that are not sharp even when broken. Therefore, such curved glass is often called curved tempered glass, and its field of application is very wide.

Documents that have been patented and published in Korea include 'method and device for bending glass sheet' of Korean Patent Application No. 10-1985-700221 (1985-09-16), and Korean Patent Application No. 10-1986-009414 (1986). -11-08) 'Transfer Method and Device of Glass Sheet', 'Laminated Glass Press-Flexing System' of Korean Patent Application No. 10-1987-002097 (1987-03-09), and Korean Patent Application No. 10-1987- 005623 (1987-06-03) 'Bending Method and Apparatus of Glass Sheet', Korea Patent Application No. 10-1987-013410 (1987-11-27) 'Bending Method and Apparatus of Glass Sheet', Korea Patent application 10-1988-000738 (1988-01-29) 'hardening and bending method of glass by stress contact of the strengthening edge' and the Republic of Korea Patent Application 10-1989-700582 (1989-04-04) 'Bending and soaking apparatus of glass', 'Apparatus and method for tempering glass sheets' of Korean Patent Application No. 10-1989-701869 (1989-10-11), and Korean Patent Application No. 10-1990-701121 ( 1990-05-28) 'Glass bending mold' and 'Position adjustment device of glass bending oven' of Korean Patent Application No. 10-1990-701122 (1990-05-28) and Korean Patent Application No. 10-1990-701123 (1990-05-28) ) 'Heating, bending and cooling device of glass', 'bent glass sheet manufacturing method and apparatus' of Korea Patent Application No. 10-1991-000810 (1991-01-18), and Korea Patent Application 10-1991- Curved Glass Molding Mold of 003864 (1991-03-08), Glass Sheet Bending Method and Apparatus of Korean Patent Application 10-1991-014384 (1991-08-21), and Korean Patent Application 10-19 Glass Sheet Bending Method and Apparatus of 1991-023613 (1991-12-20) and Glass Sheet Heating Furnace and Conveyor and Heating Method of Korean Patent Application No. 10-1991-701459 (1991-10-26) And Korean Patent Application No. 10-1993-000403 (1993-01-14), 'Method for manufacturing curved window glass of automobile with thin glass', and Korean Patent Application No. 10-1993-012317 (1993-07-01 Glass sheet forming apparatus and method) , Glass Sheet Bending Method and Apparatus of Korean Patent Application No. 10-1993-012318 (1993-07-01) and Glass Sheet Bending Method of Korean Patent Application No. 10-1993-704016 (1993-12-24) And apparatus', 'Glass sheet bending method and apparatus' of Korean Patent Application No. 10-1994-022237 (1994-08-31), and Glass of Korean Patent Application No. 10-1994-036680 (1994-12-22) Bending Furnace ',' Glass Sheet Bending Method and Apparatus' of Korean Patent Application No. 10-1995-002581 (1995-02-13), and Korean Patent Application No. 10-1995-008457 (1995-04-12) Work process of pressurizing bending part for bending plate glass', 'Pressure bending part for bending plate glass' of Korean Patent Application No. 10-1995-008458 (1995-04-12), and Korean Patent Application No. 10-1995-008459 ( 'Bent plate glass transfer device' of 1995-04-12), 'Front glass loading system for automobile' of Korean Patent Application No. 10-1995-017865 (1995-06-28), and Korean Patent Application No. 10-1995- 026938 (1995-08-28) 'Car side, after Glass loading system 'and' plate glass bending apparatus and method 'of Korean Patent Application No. 10-1995-034448 (1995-10-04), and Korean Patent Application No. 10-1995-035241 (1995-10-13) Pressing molding method of glass sheet ',' Curved glass molding frame 'of Korean Patent Application No. 10-1996-069396 (1996-12-21), and Korean Patent Application No. 10-1997-018186 (1997-05-12) 'Curved Glass Molding Frame', 'Press Molding Mold and Manufacturing Method of It and Glass Manufacturing Method Using It' of Korean Patent Application No. 10-1998-005490 (1998-02-21), and Korean Patent Application 10-1998-705855 (1998-07-30) 'Control System for Heating in Glass Bending Oven' and 'Bent Glass Foil of Korean Patent Application No. 10-1999-703557 (1999-04-23) Apparatus for cooling ',' Method of manufacturing three-dimensional curved tempered glass and its manufacturing apparatus' of Korean Patent Application No. 10-2000-018264 (2000-04-07), and Korean Utility Model Application No. 20-1990-008474 ( 1990-06-15) 'Glass Forming device for curved surface processing of ash ',' Forming device for curved surface processing of glass plate 'of Korean Utility Model Application No. 20-1990-008475 (1990-06-15), and 20-1990-008524 (1990-Korean Utility Model Application of Korea) 06-16) 'Curved curvature of glass sheet', Korea Utility Model Application No. 20-1990-008566 (Curvature of Curvature of Glass Plate), Korean Utility Model Application 20 -1991-004379 (1991-03-30), 'Curved Glass Molding Frame Using Chain', and Korea Utility Model Application No. 20-1996-053310 (1996-12-21) 'Curved Glass Molding Surface' There is this.

At room temperature, glass that is hardly brittle and hard to form cannot be formed at high temperatures of about 500 ° C. or higher, so that brittleness decreases and ductility increases. The techniques described in the above-mentioned documents are generally molded into a desired curved shape by pressing the glass using a mold of a desired contour while the glass is heated to about 550 ° C. Alternatively, the plated glass may be molded into a desired curved shape by gradually transferring a heated plate glass on a support bed that gradually changes from a planar shape to a curved shape having an appropriate curvature radius.

Plate glass having a thickness of 5 mm or less can be molded even at a temperature of about 550 ° C., but in order to form a plate glass having a thickness of 5 mm or more, sufficient ductility can be obtained.

In the case of molding by compression, mechanical stress due to compression may remain, and deformation may be uneven overall, resulting in poor optical quality of the glass.

In addition, in some cases, it is necessary to have both a preheating facility and a molding facility, resulting in a complicated facility and a large number of processes.

In the case of molding while transporting onto the support bed, a considerably long support bed must be installed, thus increasing the space occupied by the equipment.

Plates molded to the desired curvature should be cooled to room temperature, and this cooling process must be managed very carefully. Like other materials, glass exhibits a volume change with temperature, and the cooling process must be managed to ensure that the volume change is uniform throughout. If the volume changes locally locally, it remains what is called thermal stress, because in thermally brittle glass these thermal stresses become fatal defects.

In the management of this cooling process, two things should be considered.

First, the glass in the high temperature state is exposed to the air from the heating process in which the molding is performed to the cooling process after the molding, and at this time, it is easy to leave thermal stress as the temperature changes locally.

Secondly, most installations use forced air cooling, which cools and cools the air by blowing it. If the air flow is not evenly distributed and is concentrated at specific points, heat is applied around such a blowing point. Will leave stress.

The present invention is to solve the problems as described above, to provide a facility for producing a curved tempered glass with excellent optical properties without leaving any mechanical stress in the molding process, and thermal stress in the cooling process will be.

In addition, to reduce the occupied space occupied by the facility, to simplify the construction of the facility, and to simplify the manufacturing process, it is possible to manufacture curved tempered glass having a thickness of about 3mm-19mm at a low cost.

1 is a view schematically showing the arrangement of a heating furnace, a cooler, a conveyor, and a mold forming a curved tempered glass manufacturing apparatus according to an embodiment of the present invention;

FIG. 2 is an elevation view of the heating furnace of FIG. 1 viewed from the inlet side,

3 is a perspective view of the heating furnace shown in FIG.

4 is a side view showing the cooler of FIG. 1 in detail;

FIG. 5 is an elevation view showing the cooler of FIG. 4 viewed in a process progress direction. FIG.

6 is a view showing a lower surface of the upper member of the cooler shown in FIG.

7 is a view showing the upper surface of the lower member of the cooler shown in FIG.

8 is a side view illustrating a state in which a mold is placed on the balance conveyor of FIG. 1,

9 is a side view showing a state in which a rectangular rod-shaped insulation is laid on the upper surface of the mold shown in FIG. 8,

FIG. 10 is a top view of the mold shown in FIG. 9;

FIG. 11 is a side view illustrating a chopped state by sprinkling powder on the upper surface of the mold illustrated in FIG. 9;

12 is a side view showing a state where a flat glass is placed on top of the mold shown in FIG. 11 before entering the heating furnace,

FIG. 13 is a side view showing a state where the flat glass shown in FIG. 12 is curved in a curved shape along the contour of the upper surface of the mold when taken out from the heating furnace,

FIG. 14 is a top view of the mold shown in FIG. 13 with curved glass; FIG.

15 is an elevation view showing the feeder of FIG. 1 viewed in a process progress direction,

16 is a top view of the conveyor shown in FIG. 15,

FIG. 17 is an elevation view showing a state in which the conveyer shown in FIG. 15 is lifted to convey curved glass;

18 is a top view of the conveyor shown in FIG. 17,

19 is an elevation view showing a state in which the conveyor lifts the curved glass and enters the cooler.

According to the present invention for solving the above technical problem, there is provided a curved tempered glass manufacturing apparatus arranged so that the transfer from the heating process to the cooling process can be made quickly.

In addition, according to the present invention, there is provided a mold capable of supporting the plate glass at room temperature and entering the heating furnace to withstand the plate glass heated to a high temperature of about 700 ℃.

In addition, according to the present invention, there is provided a conveyor capable of quickly separating the plate glass exiting the heating furnace from the mold to enter the cooler.

According to the present invention, there is also provided a cooler configured to supply cool air evenly to both sides of the curved pane.

In addition, according to the invention, the step of loading the plate glass at room temperature on the mold formed in the upper surface curved surface and entering into the heating furnace, withdrawing the plate glass is completed from the heating furnace, the plate glass withdrawn from the heating furnace Lifting and entering into the cooler is provided, and a method for producing a curved tempered glass, including the step of cooling by supplying cool air evenly on both sides of the plate glass in the cooler.

The cooling step preferably further comprises the step of reciprocating the cooler by an appropriate stroke relative to the pane.

These and other features and advantages of the present invention will become more apparent upon reading the following description of the preferred embodiments, with reference to the accompanying drawings.

As shown in FIG. 1, a curved tempered glass manufacturing apparatus 100 according to a preferred embodiment of the present invention is a bogie-type conveyor that carries a heating furnace 110, a cooler 170, a conveyor 150, and a mold 130. It consists of 120, the trolley | bogie type conveyor 120 and the conveyer 150 are arrange | positioned between the heating furnace 110 and the cooler 170. That is, the mold conveyor 120 for moving the mold 130 is installed between the heating furnace 110 and the cooler 170, and the transfer rail for moving the conveyor 150 on both sides of the mold conveyor 120. 151 are installed side by side.

The heating furnace 110 according to this embodiment has a box-type structure in which a door 111 that is lifted up and down is installed as shown in FIGS. 2 and 3. Gas or electricity may be used as the heat source of the heating furnace 110, but the configuration of the heating furnace 110 is the same as the well-known heating furnace 110 that has been developed and used in the prior art will not be described in detail.

In this embodiment, as the mold conveyor 120, a bogie-type conveyor 120 that slides over the roller 121 fixed to the bottom is used. The mold 130 on which the glass 140 is loaded is heated to the furnace 110. Other conveyors 120 are also available as long as they can be quickly moved in and out and can withstand high temperatures.

The mold 130 according to this embodiment includes a body 131 made of titanium having high heat resistance, as shown in FIGS. 8 to 14. The body 131 made of titanium not only has high heat resistance, but also has high corrosion resistance and rust resistance despite repeated temperature changes from high temperature to room temperature.

The upper surface of the body 131 has a curved shape that corresponds approximately to the curved shape to be formed in the plate glass. The upper surface of the body 131 forming a curved surface is densely laid a heat insulating material 133 of the rectangular bar shape of 15 to 50mm thick. Such a heat insulating material 133 is referred to as a 'hard board', not only excellent heat insulation effect, but also excellent heat resistance at high temperatures. The square rod-shaped insulation 133 is smoothly polished to prevent damaging the glass surface, and adjusts each height to complete a desired curved shape in a state laid on the surface of the body 131. The upper surface of the body 131 is preferably formed with a plurality of fins (132: fin) capable of stably supporting the heat insulating material 132.

On the insulating material 133 is sprinkled with a fine powder-shaped stone powder 134, referred to as 'talk powder' to a thickness of 0.3mm or more to fill the gap between the insulating material 133 and chop.

The mold 130 finished with the heat insulator 133 and the stone 134 is disposed on the mold conveyor 120, and the flat glass 140 to be processed is mounted on the upper surface of the mold 130. The mold conveyor 120 slowly and carefully moves the mold 130 on which the flat glass 140 is placed, to place it in the heating furnace 110 as shown in FIG. 6, and to lower the door 111 of the heating furnace 110. When closed, you are ready to proceed with the heating process.

When the temperature rises by heating the flat glass 140 in the heating furnace 110, the ductility of the glass increases, and the flat glass 140 gradually falls down due to the weight of the glass to closely adhere to the upper surface of the mold 130. The temperature at which the glass is intimately adhered to the upper surface of the mold 130 is somewhat different depending on time, but the adhesion is usually completed at a temperature of about 680 to 700 ° C. Since there is a possibility that the marks on the surface of 130 may be imprinted, it is preferable that the adhesion is completed by maintaining at a temperature below 720 ° C. for a sufficient time.

As shown in Fig. 15 to 19, the conveyor 150 of the curved tempered glass manufacturing apparatus 100 according to this embodiment is provided with a curved lifting arm 152 corresponding to the shape of the upper surface of the mold 130. . In this embodiment, four lifting arms 152 are provided, two on each one of the transfer rails 151, and at each end of each lifting arm 152, a hook portion for lifting the curved plate glass 141 can be lifted. 153 is formed.

When laying the heat insulator 133 of the mold 130, the recesses 135, 136, 137 and 138 into which the engaging portion 153 of the lifting arm 152 can be left are left.

The curved plate glass 141 in which the molding is completed in the heating furnace 110 is drawn out together with the mold 130 by the mold conveyor 120. At this time, it is preferable that the withdrawal is performed quickly within the limit that the curved plate glass 141 does not slip relative to the mold 130.

As soon as the mold 130 and the curved pane 141 are withdrawn, the lifting arm 152 of the conveyor 150 lifts the curved pane 141 out of the mold 130 as shown in FIG. Into the cooled cooler 170. In the curved tempered glass manufacturing apparatus 100 according to this embodiment, the curved plate glass 141 may be introduced into the cooler 170 within 3 to 5 seconds from the time point at which the curved plate glass 141 is drawn out from the heating furnace 110.

As shown in FIG. 4, the cooler 170 of the curved tempered glass manufacturing apparatus 100 according to the present exemplary embodiment may have upper and lower sides forming a curved gap 175 corresponding to the shape of the curved plate glass 141. It consists of two members 173 and 174. Each of the upper member 173 and the lower member 174 is formed with a plurality of blowing holes (177, 178) that can eject cold air to the plate glass. Air is supplied through the ducts 171 and 172 by a blow pump (not shown). A sufficient space is formed between the outlets of the ducts 171 and 172 and the ejection holes 177 and 178 so that the duct ( The air pressure supplied through the 171 and 172 evenly spreads to all the blow holes 177 and 178.

The upper member 173 and the lower member 174 of the cooler 170 are disposed to be spaced apart by about 2 cm from the surface of the curved plate glass 141. No matter how dense the blow holes 177 and 178 are perforated, the amount of air supplied to the surface of the glass may vary depending on where the blow holes 177 and 178 are perforated. Therefore, the curved tempered glass manufacturing apparatus 100 according to this embodiment is a vibrator (not shown) shaking the upper member 173 and the lower member 174 of the cooler 170 in the direction indicated by arrows A and B in FIG. ). The stroke that the upper member 173 and the lower member 174 reciprocate is suitably equal to the interval at which the blow holes 177 and 178 are drilled. The air velocity ejected from the blow holes 177 and 178 should be adjusted according to the thickness of the plate glass. For the 8 mm thick plate glass, the speed of about 8 kW is appropriate, and for the 5 mm thick plate glass, The speed is appropriate.

Although the configuration of the curved tempered glass manufacturing apparatus based on the preferred embodiment of the present invention has been described above, this is merely exemplary, and is not intended to limit the present invention.

In the illustrated embodiment, the shape of the upper surface of the mold is formed of one curved surface having the same curvature radius, but the wave-shaped mold having a plurality of curved surfaces having the same or different curvature radius depending on the curved shape of the plate glass to be formed. Also available.

In the process of manufacturing a wave-shaped glass plate, the weight of the glass alone may not be completely adhered to the upper surface of the mold. Therefore, in this case, when the pressure mold having a lower surface of the shape corresponding to the contour of the upper surface of the mold is additionally placed on the upper part of the mold according to the above-described embodiment, when the temperature of the glass reaches an appropriate level, That is, in the case of a plate glass having a thickness of 5 mm or less, about 550-650 ° C., and in the case of a plate glass having a thickness of 5 mm or more, when the heating time is longer and reaches a sufficient ductility, it is pressed down lightly using a press mold. .

In addition, since the wave-shaped plate glass may cause sag deformation during the transfer process after molding, an alumina insulating material is disposed at an appropriate position in the middle of the hard board insulating material, and the side end of the alumina insulating material is lifted and conveyed by a conveyor. Is good.

It will be apparent to those skilled in the art that changes, modifications, or adjustments from the illustrated embodiments can be made without departing from the spirit of the invention. In the following claims, the scope of protection is intended to cover all such modifications, variations or modifications.

According to the curved tempered glass manufacturing apparatus and method according to the present invention described above, it is possible to manufacture a reinforced curved tempered glass with excellent optical properties without leaving any mechanical stress in the molding process and no thermal stress in the cooling process. In addition, since the occupied space occupied by the facility is significantly reduced, the configuration of the facility is simple, and the manufacturing process is very simple, the curved tempered glass can be manufactured at low cost.

Claims (8)

In the curved tempered glass manufacturing apparatus for manufacturing a curved tempered glass from flat glass, A heat-resistant mold configured to support a plate glass at room temperature and enter a heating furnace, A cooler configured to supply cool air evenly on both sides of the curved pane, A feeder configured to quickly separate the pane from the furnace from the mold and enter the cooler, A mold conveyor for moving the mold is installed between the heating furnace and the cooler. Curved tempered glass manufacturing apparatus, characterized in that the both sides of the mold conveyor is installed in parallel with the conveying rail for moving the conveyer. The method according to claim 1, The cooler is composed of two upper and lower members having a curved shape corresponding to the curved shape of the plate glass to be molded, Each member is provided with a plurality of blow holes for blowing cool air to the plate glass, And the cooler additionally includes a vibrator by shaking the upper member and the lower member to reciprocate by an appropriate stroke. The method according to claim 1 or 2, The mold conveyor is curved tempered glass manufacturing apparatus, characterized in that the sliding conveyor moving on a fixed roller on the bottom. The method according to claim 1 or 2, The mold includes a body made of heat resistant titanium, The upper surface of the body is characterized in that it is configured to close the gap between the insulating material by densely laying a rectangular rod-shaped heat insulating material having a thickness of 15 to 50mm and sprinkling fine powder powder on the heat insulating material to a thickness of 0.3 mm or more. Curved tempered glass manufacturing apparatus. The method according to claim 1 or 2, The conveyor has a plurality of curved lifting arms corresponding to the shape of the upper surface of the mold, Curved tempered glass manufacturing apparatus, characterized in that the end of each lifting arm is formed with a hook that can be lifted by the plate glass. In the curved tempered glass manufacturing method for producing a curved plate glass from flat glass, Loading the plate glass at room temperature on a mold having an upper surface curved to enter a heating furnace, Drawing the completed glass from the heating furnace; Lifting the plate glass drawn from the furnace to enter the cooler; Curved tempered glass manufacturing method comprising the step of cooling by supplying cool air evenly on both sides of the plate glass in the cooler. The method according to claim 6, The cooling step further comprises the step of reciprocating the cooler by the appropriate stroke relative to the plate glass. The method according to claim 6 or 7, The mold has a wavy surface of the upper surface, Additionally disposing a pressurizing mold having a lower surface of a shape corresponding to the contour of the upper surface of the mold; When the temperature of the glass reaches an appropriate level, further comprising the step of pressing down to the pressing mold.