JPH0623064B2 - Method and apparatus for manufacturing curved glass plate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a curved glass plate and an apparatus therefor, and more particularly to the gradual cooling of a curved laminated glass plate.

(Prior Art) Many glass sheets bent into various shapes are used for automobile windshields, rear windows, and the like, and recently, a bent shape of two laminated glasses is required.

The glass plate after bending, which is the base plate of the laminated glass plate for the windshield, uses the glass plate that has been gradually cooled after bending as a safety measure for the driver in the event of an automobile collision. The shock of the part is buffered to further secure the front field of view.

As a part of the bending process, the slow cooling process is described in, for example, JP-A-63-19.
Japanese Patent No. 0730 discloses that a bending process in which two glass plates are individually heated to a bending temperature to perform bending, a gradual cooling process in which each of the glass plates is gradually cooled, and a gradual cooling process after gradual cooling are performed. A bending method is known which includes a step of stacking glass plates on each other and placing them on a baking ring, and a processing step of fitting and matching the surface shapes of the stacked glass plates well.

Further, in Japanese Patent Laid-Open No. 62-283834, after bending the first glass plate in a bending station, the glass is placed on a supporting ring of a carrier having a supporting ring corresponding to the bending plate shape, Similarly, the second glass plate is bent and placed on the first glass plate on the support ring in an overlapping manner, and then the carrier truck gradually cools the curved glass plate while moving to the cooling furnace. A gradual cooling process is known in which the carrier truck is brought to the bending station again from the cooling furnace as it moves to the process.

(Problems to be Solved by the Invention) In the above-mentioned Japanese Patent Laid-Open No. 63-190730, the glass plate is placed on each baking ring for a certain period of time in the slow cooling step after completion of the pressing step, and after the slow cooling. With the glass plates placed on the baking ring, the process moves to the next two-ply stacking process, which requires an annealing furnace of a size that accommodates at least two glass plates, and after annealing. The mold ring moves to the heat forming step and is then cycled to the bending step through an appropriate conveying means such as a return conveyor, but there is a drawback that a complicated and excessive device is required.

On the other hand, in Japanese Unexamined Patent Publication No. 62-283834, a support ring and a carrier similar to the above are introduced from the bending station to the bending station again through the cooling furnace. There was a problem such as the amount of heat to reheat the dolly and the deformation of the dolly due to repetition.

(Means for Solving the Problems) The present invention has been made in view of the problems of the above-described conventional technology, and provides a manufacturing method and an apparatus for the heat treatment of a simple structure and energy saving type, particularly for slow cooling. It is provided.

In order to achieve the above-mentioned object, at least two glass plates for laminating are sequentially transferred in a horizontal state while being heated to a bending temperature in a heating furnace, and are adsorbed by a forming furnace adjacent to the heating furnace. A method and an apparatus for manufacturing a curved glass plate in which the first curved glass plate and the second curved glass plate bent by The first curved glass plate curved in the molding unit is placed on the molding ring that sits on the receiving carriage in the molding unit, and the first curved glass plate on the receiving carriage is adjacent to the molding furnace. The auxiliary furnace is moved to a high temperature part and kept at a predetermined temperature while standing by, and then similarly, the second curved glass plate is molded in the molding part and placed on the first curved glass plate in an overlapping manner. This is the supplement A heat treatment is carried out in the low temperature part of the furnace, and the two bent glass sheets stacked in the low temperature part are heat-treated during the heat treatment, and the next glass plate is further bent in the forming part. In this way, continuous production is repeated.

Further, an auxiliary furnace having a high temperature part and a low temperature part which are adjacent to one side surface of the forming furnace and which are orthogonal to the transfer direction to the forming furnace following the heating furnace, and the auxiliary furnace on the side surface of the forming furnace. Provided is an apparatus provided with a sliding means which can reciprocate along it and a receiving carriage which can pass through the auxiliary furnace and can receive and move the curved glass plate at a forming part in the forming furnace.

(Example) Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an assembled perspective view showing a main part with a part cut away, FIG. 2 is a perspective view illustrating sliding of an auxiliary furnace, FIG. 3 is a plan view showing the entire bending process, and FIG. FIG. 3 is a vertical sectional view taken along line AA of FIG. 3.

A series of glass plate bending apparatus for laminated glass shown in FIGS. 3 and 4 comprises a heating furnace 3 provided with a roll conveyor 1 for heating the glass plates 2 and 2 ′ while conveying them, and a heating furnace 3 disposed at the end of the heating furnace. The adsorbing tool 4 is provided in the forming furnace 6 and a wind pipe (not shown) for blowing hot air from below is installed to keep the ambient temperature at 630
Molding section 5 in the range of up to 670 ° C., hot furnace 9 for holding trolley 8 on which bending mold 7 is placed on one side of the molding furnace, and molding chamber 6 on the other side for sealing chamber.
An auxiliary furnace 11 is arranged via 10.

Sealing chamber 10 that closely contacts the molding furnace 6 following the heating furnace 3
Inside, a damper 13 which is connected by a wire and moves up and down by the operation of a cylinder 12 is provided, and an unillustrated auxiliary roll, which will be described later, is arranged at the bottom of the cavity of the chamber.

The auxiliary furnace 11 that is joined to the seal chamber 10 in this way is
The seal chamber 10 side and the opposite side both sides have openings 14 cut through to penetrate the inside of the auxiliary furnace to a high temperature part that can be set to a specific temperature in the range of 450 to 600 ℃, below 300 ℃ A partition damper 18 is provided to partition the low temperature section 17 to be set,
The damper is a cylinder that sits on the ceiling seat of the auxiliary furnace
It moves up and down by the operation of 15, and an electric heater connected to the ceiling and bottom of the auxiliary furnace by an unillustrated power supply line is arranged, and further, a plurality of exhaust pipes 19 with banders are provided on the ceiling of the low temperature section 17. Plant.

A rail is provided below the auxiliary furnace 11 as a sliding means of the auxiliary furnace.
A pedestal 21 laying 20 supports the auxiliary furnace via a linear bearing 22, and a rod of a sliding cylinder 23 seated on the pedestal is connected to a piece 24 fixed to one end of the auxiliary furnace with a nut to slide The auxiliary furnace 11 is railed by the operation of the moving cylinder 23.
Move left and right along 20.

The opening 14 integrated with the low and high temperature parts of the auxiliary furnace 11 is closed by a damper 26 that moves up and down via a wire in a cylinder 25 that is seated on a frame (not shown) and a seal chamber 10, but the rest is attached to a column 27. The U-shaped heat insulating cover 28 for the high temperature portion or the heat insulating cover 28 'for the low temperature portion closes both openings 14.

In front of the damper 26, a pedestal 30 on which a rail 29 is laid is arranged, and on the upper part of the rail, a receiving trolley 33 on which a molding ring 32 that can be assembled and removed by a frame 31 is placed, and a roll 34 at the end thereof. The shaft 31 is mounted on a shaft stand erected on the pedestal 30 via a rotatable auxiliary roll 35 and moves along the rail 29, but the frame 31 is supported in the auxiliary furnace 11 by the above-mentioned seal. Supported by an auxiliary roll (not shown) in the chamber 10, the forming ring 32 extends into the forming section 5.

The drive of the receiving carriage 33 that moves along the rail 29 is transmitted by, for example, a chain (not shown) connected to the end of the frame 31 on the roll 34 side, and is arranged in a position isolated from high heat by a motor (not shown) that drives forward and reverse. Is desirable.

The operation of the present invention will be described below.

When the glass plates 2 and 2 ′ on the roll conveyor 1 are heated in the heating furnace 3 and heated to the bending temperature to reach the forming section 5, the first glass plate 2 ′ is floated by the air blown from below. Then, it is adsorbed by the adsorption tool 4 and rises together with the adsorption tool.

Then, the trolley 8 standing by in the hot furnace 9 moves into the forming unit 5 and stops at a predetermined position, and then the glass plate 2 ′ is pressed against the bending die 7 by the lowering of the suction tool 4 to form a curved glass plate. Mold. Subsequently, the truck 8 is retracted to the hot furnace 9 as the suction tool 4 that suction-holds the glass plate rises.

On the other hand, the forming ring 32 placed on the receiving carriage 33 stands by at the high temperature portion 16 side of the auxiliary furnace 11 , but the cylinders 12 and 25 operate in conjunction with the end of the backward movement of the carriage 8 and the dampers 13 and 26 rise. When fully opened, the receiving cart 33 enters the molding unit 5, and after stopping at a predetermined position, the first bent glass plate held by the suction tool 4 is transferred onto the molding ring 32.

Then, the trolley 33 is retracted into the high temperature section 16, and the damper 1
Stand by in the high temperature section 16 with the full closure of 3, 26.

On the other hand, the next glass plate 2 conveyed into the forming unit 5 is curved similarly to the first glass plate by the suction tool 4 and the bending die 7 in the same manner as described above, is suction-held by the suction tool 4, and the carriage is hot. When retracted to the furnace 9, the dampers 13 and 26 are fully opened and the trolley is received.
When 33 enters the forming part 5 and stops at a predetermined position, the second curved glass plate held by the suction tool 4 is transferred onto the forming ring 32, and the first curved glass plate is transferred. Put it on top.

While the receiving carriage 33 enters the forming unit 5 and waits to receive the second curved glass plate, the cylinder 15 on the auxiliary furnace 11
The operation of the sliding cylinder 23 that follows after raising the damper 18 moves the auxiliary furnace 11 along the rail 20,
The arrangement of the high temperature part 16 and the low temperature part 17 is changed, and after the damper 18 descends, the receiving cart 33 retracts into the low temperature part 17 and the dampers 13, 26
Is fully opened, the temperature in the low temperature portion 17 is lowered by the exhaust pipe 19 and the temperature of the low temperature portion 17 is kept on standby until a predetermined temperature is reached. In the meanwhile, in the forming portion 5, the forming and bending of the next glass plate is performed.

After the slow cooling is completed, the damper 26 is pulled up by the operation of the cylinder 25, the receiving cart 33 is pulled out from the low temperature section 17, and the two curved glass plates on the molding ring 32 are conveyed to the next step by a transfer device (not shown). .

When the sliding cylinder 23 operates while the two curved glass plates are being transferred and the rod is housed in the cylinder, the auxiliary furnace
11 moves along the rail 20, the high temperature part 16 is set at the position of the damper 26, the molding ring 32 of the receiving carriage 33 is thrust into the high temperature part, and then the damper 26 is fully closed to the next curved glass plate. Wait until the bending process.

Since there is a temperature difference between the forming part 5 and the high temperature part 16 and the first curved glass plate is on standby at the high temperature part, even if the second curved glass plate is placed on top of it There is no deformation, and the second curved glass plate, on the contrary, has a good fit and becomes two glass plates that are adhered over the entire surface.

The temperature of the low temperature part 17 is controlled by the opening of a damper provided in the exhaust pipe 19, and the internal temperature is lowered to gradually cool the curved glass plate on the molding ring 32.

The operation of each cylinder and the control of the movement position of the trolley can be achieved by, for example, a combination of a sensor and a sequence that is usually adopted.

The present invention can process a plurality of sheet glasses including a single sheet.

(Effects of the Invention) The present invention switches the auxiliary furnace having a high temperature part and a low temperature part and waits, gradually cools, and carries out the curved glass sheet by one receiving trolley. Since the single plate is continuously bent or superposed and heat-treated, the productivity is improved, and a well-matched laminated glass having the same curvature can be manufactured.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is an assembly perspective view showing a main part with a part cut away, FIG. 2 is a perspective view illustrating a sliding means of an auxiliary furnace, and FIG. FIG. 4 is a plan view showing the whole process, and FIG. 4 is a vertical sectional view taken along line AA of FIG. 2, 2 '... Glass plate, 3 ... Heating furnace 5 ... Forming part, 6 ... Forming furnace 11 ... Auxiliary furnace, 16 ... High temperature part 17 ... Low temperature part, 23 ... Sliding cylinder 32 ... … Molding ring, 33 …… Receiver cart

Claims (3)

[Claims] 1. At least two glass sheets for laminating are individually transferred in a horizontal state while being heated to a bending temperature in a heating furnace and sequentially transferred, and then bent by an adsorption method in a forming furnace adjacent to the heating furnace. In the method for producing a curved glass plate in which the first curved glass plate and the second curved glass plate are placed one on top of the other, and are integrally carried out after heat treatment, curved molding is performed in the molding section of the molding furnace. The first curved glass plate is placed on the molding ring that is seated on the receiving trolley at the forming unit, and the first curved glass plate on the receiving trolley is located at a high temperature part of the auxiliary furnace adjacent to the forming furnace. To a standby state while maintaining a predetermined temperature, and then similarly molding a second curved glass plate in the molding section and placing it on the first curved glass plate in an overlapping manner. Processing and unloading in the low temperature part of the furnace Method for producing a curved glass sheet, characterized in that there was Unishi. 2. The method of claim 1, wherein during the heat treatment of the two curved glass sheets that are stacked in the low temperature section, the subsequent glass sheet is further curvedly curved in the molding section for repeated continuous production. Method for manufacturing curved glass sheet. 3. At least two glass sheets for laminating are individually transferred in a horizontal state while being heated to a bending temperature in a heating furnace, and sequentially transferred, and then bent by an adsorption method in a forming furnace adjacent to the heating furnace. In the apparatus for manufacturing a curved glass plate in which the first curved glass plate and the second curved glass plate are placed one on top of the other and are heat-treated together and then carried out, in the transfer direction to the forming furnace following the heating furnace. An auxiliary furnace having a high temperature portion and a low temperature portion which are orthogonally crossed and adjacent to one side surface of the forming furnace, and a sliding means capable of reciprocating the auxiliary furnace along the side surface of the forming furnace.
An apparatus for manufacturing a curved glass plate, characterized in that a receiving cart that can pass through the auxiliary furnace and that can receive the curved glass plate at a forming part of the forming furnace is provided.