JPS6131323A - Method and device for bending sheet glass - Google Patents

Abstract

PURPOSE:To prevent the generation of a sag, optical strain, etc. by consisting in forming vertical grooves to a lower die, lowering conveying rollers carrying heated sheet glass in a horizontal state into the grooves and imposing the sheet glass on the lower die. CONSTITUTION:The sheet glass G is imposed on the conveying rollers 10 and is passed in a heating furnace 9 where the glass G is heated to the temp. near the softening point. The glass G is then transferred in the horizontal state to the forming position between as upper die 3 and the lower die 4 by the conveying rollers 10, 10a disposed in a forming device 1. A cylinder unit 12 is actuated in succession thereto to lower the rollers 10a so that the rollers 10a are intruded into the grooves 8 formed in the position of the die 4 right under the rollers 10a. The glass G imposed on the rollers 10 is thus transferred onto the forming surface of the die 4. The die 3 is then lowered to form the glass G.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method and an apparatus for bending and forming a plate glass using gravity or gravity and pressing force of an upper die.

(Prior art) A method for forming curved glass sheets such as automobile window glasses is to transport the sheet glass vertically from a heating furnace, place it between left and right molds, and clamp the molds to bend and form the glass. , the plate glass is carried out horizontally from the heating furnace, placed on the lower mold, the lower mold is raised, and the plate glass is shaped to follow the shape of the lower mold by the inertia and gravity (self-weight of the plate glass) accompanying this rise. There is also a method of bending and forming, and a method of bending and forming using an upper die and utilizing the pressing force of the upper die in addition to inertia and gravity.

When considering continuous forming, it is more advantageous to transport the plate glass horizontally from the heating furnace, so for automobile window glass, etc., a means of transporting the plate glass horizontally from the heating furnace is adopted. It is being

As such a molding method or device, the Japanese Patent Publication No. 46-1
No. 3272 and Japanese Patent Publication No. 53-12931 have been proposed. The method shown in Japanese Patent Publication No. 46-13272 involves placing a heated plate glass on the upper blade of a lower mold (forming mold),
After this, the lower mold was raised to bend and form the plate glass using gravity and inertia.
The apparatus shown in No. 12931 bends and forms a sheet glass using gravity and inertial force in the same manner as described above, and at the same time adds a quenching device to perform a strengthening treatment at the same time as the bending and forming.

(Problems to be Solved by the Invention) Both conventional methods and devices utilize gravity and inertial force to bend and shape sheet glass.

When bending a glass plate using a lower die, if the forming surface of the lower die is brought into full contact with the surface (center) of the glass plate, optical distortion will occur on the surface of the glass plate. The lower mold is used. When the ring-shaped lower die is used to form a glass plate, if the inertial force increases, the surface of the glass plate will sag.

In addition, if the lower mold is gradually raised to reduce the inertial force, the contact time between the conveyance roller and the sheet glass becomes longer, and only the part that is in contact with the conveyance roller is cooled, and eventually the surface of the sheet glass is conveyed. Optical distortion will occur in the portion that comes into contact with the roller.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms a vertical groove in the lower mold, and a conveying roller that horizontally conveys the heated plate glass is lowered into the groove. I tried to get into it.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

Fig. 1 is a front view of the bending forming device according to the present invention, and Fig. 2 is a side view of the bending forming device. The mold (4) is arranged,
The upper mold (3) is attached to the support plate (5), and this support plate (
5) is moved up and down by the operation of the cylinder unit (6). The lower mold (4) is moved up and down by a cylinder unit (7), and as shown in the partial plan view of Fig. 3, almost the entire upper surface is used as a molding surface, and holes are formed at predetermined locations on this molding surface. A cooling air jetting nozzle (4a) whose tip is recessed from the molding surface is attached to the hole. That is, during molding, the sheet glass (G
) Blow cooling air onto the bottom surface. The upper mold (3) also has a similar configuration.

Furthermore, vertical grooves (8) that open upward are formed in portions of the lower mold (4) that do not interfere with the nozzle (4a).

On the other hand, a heating furnace (8) is disposed on the side of the bending forming device (1), and within this heating furnace (9) there are provided conveying rollers (10) for sheet glass (G). Heating furnace (9)
The bending machine is placed at a height approximately equal to the conveyance exit.
A support stay (11) is fixed to the frame (2) of (1). A pair of these support stays (11) are provided spaced apart from each other in the front and rear (in the direction perpendicular to the plane of the paper in FIG. 1).
1) supports conveyance rollers (10) similar to those described above.

In addition, a pair of cylinder units (12) and (13) are installed upright at the front and back positions of the lower mold (4), and these cylinder units (12), (13) (7) C'-/D (12a)
, (13a) has a head section (14), (1
5), and each head part (+4), (+5) is equipped with a bearing (
1B), (1?) are fixedly installed, and these bearings (14), (
15) A conveyance roller (lQa) similar to the above is rotatably supported between the two, and this conveyance roller (10a) is connected to the head part (1
4) is rotated by a motor (18) fixed to the motor.

Here, the conveyance roller (10a) is positioned above the groove (8) formed in the lower mold (4), and the cylinder units (12) and (13) are retracted so that the conveyance roller (l Oa) enters into the groove (8), and the upper surface (molding surface) of the lower mold (4) passes through the conveyance roller (tOa).
), so that it is on the E side.

- An oscillation device (20) having a ring-shaped auxiliary mold (19) attached to its tip is disposed so as to surround the lower mold (4). This oscillation device (20) rapidly cools and strengthens the plate glass (G).

The oscillation device (20) includes a movable base (22) placed on a base (21) so as to be movable back and forth and left and right, an arm (23) erected on the movable base (22), and a base. (21
) and a motor (24) fixed on top of the motor (
The driving force of 24) is transmitted to the movable base (22) via a gear train or a link mechanism, etc., and the movable base (22) is reciprocated so as to draw, for example, an elliptical trajectory in plan view, and the auxiliary type (19)
Cooling air is evenly blown onto the surface of the molded plate glass (G) placed above.

A molding method using the molding apparatus (1) having the above configuration will be described below.

First, place the plate glass (G) on the conveyance roller (10),
By rotating the conveyance roller (lO), the plate glass (G) is passed through the heating furnace (9) and heated to near its softening point. The plate glass (G) carried out from the heating furnace (9) is transferred to a conveying roller (10) disposed in a forming device (+),
(10a), the upper mold (3) and lower mold (
4) It is transported to the position of the molding part between. At this point, the motor (18) is stopped and the movement of the glass plate (G) is stopped.

Incidentally, at this time, the upper mold (3) is located at an upper position, and the upper mold (4) is located at a lower position than the conveyance roller (10a).

Immediately after the plate glass (G) is located in the forming section, the cylinder units (12) and (13) are activated to lower the conveyance roller (10a). Then, the lower mold (4
Since a groove (8) is formed directly below the conveyance roller (ioa) of the lower mold (4), the conveyance roller (lea) that has descended enters the groove (8) as shown in FIG.
) The upper surface is located above the conveyance roller (10a).

Therefore, the plate glass (G) placed on the transport roller (tOa) is transferred to the molding surface of the lower mold (4). Note that the peripheral edge of the glass plate (G) is placed on the ring-shaped auxiliary mold (18).

Further, in parallel with the descent of the transport roller (tOa), the cylinder unit (6) is operated to lower the upper mold (3) until it comes into contact with the rimming switch (22), and the upper mold (3)
) and the lower mold (4) are clamped. Then, plate glass (G
) is bent to follow the shape of the mold by gravity (its own weight) and the pressing force of the upper mold (3).

Next, when the bending is completed, the cylinder unit (
7) to lower the lower mold (4). As a result, the lower mold (4) is in a position where it does not interfere with the reciprocating movement of the oscillation device (20), and the plate glass (G) is placed in the auxiliary mold (18).
). After that, cooling air is blown onto the surface of the glass plate (G) from the cooling devices provided in the lower mold (4) and the upper mold (3), and the oscillation device (20) is driven.
Cooling air is uniformly applied to the surface of the glass plate (CG') to rapidly cool and strengthen the glass plate (G).

After this, the cylinder unit (6) is operated again to raise the old model (3), and the cylinder unit (1
2), activate (+3) to move the plate glass (G) to the auxiliary type (
18), the motor (18) is driven to rotate the conveyance roller (10a), and the plate glass (G) is conveyed to the next process.

FIG. 4 is a side view of a bending forming device according to another embodiment, and FIG. 5 is a schematic diagram of the main parts of the bending device.
1) is similar to the above, but the plate glass (G) is bent and formed between the second mold (33) and the lower mold (34).
The lower mold (30 has a flat ring shape, and the central part (3
4a) and both side parts (34b) and (34b), and the both side parts (34b) and (34b) are connected to the center part (34a) by the cylinder unit (35) and (35). ).

It is possible to swing vertically around (33).

In addition, the conveyance roller (3Oa) located in the molding section is a cylinder unit (32), (33) as in the above embodiment.
The lower die (34) can be moved up and down by the operation of the conveyor roller (30a).
A groove is formed into which the material enters.

The operation is similar to that described above. After the plate glass (G) is conveyed horizontally to the molding section, the conveyance roller (3Oa) descends and is placed on the lower mold (30), and the upper mold (30) is placed on the upper mold (
It is bent and formed according to the shape of the die by the press force of step 33).

In particular, in this embodiment, as shown in FIG. To separate from the plate glass (G) and conveyance roller (30a)
The contact time with the glass (G
) It is possible to more effectively prevent sagging of the surface portion and further reduce optical distortion.

In the above embodiment, an example was shown in which bending is performed between an upper mold and a lower mold, but the upper mold may not be provided and the bending may be performed only with the lower mold.

In addition, in the example, the lower die was not raised during molding to prevent inertial force from acting on the sheet glass, but as long as it does not affect the sagging of the surface of the sheet glass. Even if the lower die is raised, there is no support.

(Effects of the Invention) As explained above, according to the present invention, the conveying roller in the forming section is lowered to place the glass plate 1a on the lower die, so that the glass plate is bent by gravity or by gravity and press force. Since it is molded and is not affected by inertial force, it can effectively prevent the plate glass surface from sagging, and the contact time between the conveyance roller and the plate glass can be shortened, so it has many effects such as suppressing the occurrence of optical distortion. do.

[Brief explanation of drawings]

Fig. 1 is a front view of the bending forming device according to the present invention, Fig. 2 is a side view of the same forming device, Fig. 3 is a plan view showing a part of the lower die, and Fig. 4 is a diagram of the forming device in the forming state. A side view, FIG. 5 is a side view of a bending device according to another embodiment, and FIG. 6 is a side view showing essential parts of a forming device according to another embodiment. In addition, (1) and (31) in the drawing are bending forming devices, (3),
(33) is an upper mold, (4) and (34) are a lower mold, (8) is a groove, (9) is a heating furnace, (10) and (10a) are conveyance rollers, (12) and (13). (32) and (33) are cylinder units, and (G) is a plate glass. j11Figure 2Figure 4

Claims (2)

[Claims] (1) A glass plate heated to near its softening point is transported horizontally to a position above the lower mold by a transport roller, and then the transport roller is lowered below the upper surface of the lower mold to place the glass plate on the lower mold, A method for bending and forming a plate glass, characterized in that the plate glass is press bent between it and an upper mold, or the plate glass is bent by its own weight. (2) A heating furnace that is equipped with conveyor rollers for sheet glass and heats the sheet glass to near its softening point while conveying it, a support frame placed on the side of the outlet of this heating furnace, and a space surrounded by this support frame. In a bending device, the bending device is equipped with a lower die for bending disposed inside the lower die, and a conveyance roller that conveys sheet glass heated to near its softening point onto the lower die in a horizontal state. A sheet glass bending and forming apparatus characterized in that a conveyance roller located at is movable up and down, and a groove portion is formed in the lower mold into which the conveyance roller, which is movable up and down, moves when it descends.