JPH0729792B2 - Method and apparatus for bending glass plate for laminated glass - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for simultaneously bending two glass sheets for laminated glass in a heating furnace, and more particularly to a method for bending laminated glass. The present invention relates to an improved method for bending a glass plate for laminated glass, which is optimal for deeply bending the side portions of two glass plates, and an improvement in the apparatus.

[Prior Art] Generally, a laminated glass is made by laminating two glass plates with a plastic intermediate film such as a polyvinyl butyral film, and is widely used as a windshield which is a windshield for automobiles from the viewpoint of safety. Has been done.

By the way, in this kind of laminated glass, it is usually required that the two-dimensional or three-dimensional curved surface has a curved shape for reasons of automobile design. It is necessary to bend and form a flat plate as appropriate. At this time, if both glass plates are molded separately, the curved surface shapes of both glass plates will differ slightly, and when two glass plates are processed together with an intermediate film interposed, the two glass plates will be intermediate. There are drawbacks such as insufficient bonding through the film, generation of bubbles on the bonding surface, and peeling. Therefore, conventionally, when manufacturing a laminated glass, a method of stacking two glass plates and bending them at the same time has been adopted.

As a conventional method of bending and forming a glass plate for laminated glass, a bending die corresponding to the bending forming surface of the laminated glass is constructed, and two glass plates for laminated glass are placed on the bending die in a stacked manner. While the bending die is carried into the heating furnace in such a state, both glass plates are heated to the bending temperature of the glass plate, and both glass plates are bent along the bending surface of the bending die as the glass plates soften. It is known to perform self-weight bending forming (see Japanese Patent Publication No. 49-10332).

In such a method, when it is necessary to deep-bend the side portion of the laminated glass, a ring-shaped surface having a bending surface corresponding to a general curved portion (shallow bending portion) of the laminated glass having a gentle curvature is formed. A ring that has a fixed split mold and a bending molding surface corresponding to the deeply bent portion of the side of the laminated glass, and is movably provided on both sides or one side of the fixed split mold by its own weight so as to move in the direction connected to the fixed split mold. -Shaped movable split mold constitutes the bending mold, and in the state where the movable split mold is expanded, two flat glass plates are placed on the bending mold, and the glass plate is heated in a heating furnace. It is carried in and heated, and the movable split mold is moved in the direction connecting to the fixed split side as the glass plates soften, and the side parts of both glasses are deeply bent by the movable split mold. Has already been provided (see Japanese Patent Publication No. 48-1210). ).

[Problems to be Solved by the Invention] However, in such a conventional method for bending a glass sheet for laminated glass, when the side portions of both glass sheets for laminated glass are deeply bent, the weight of the laminated glass is reduced by its own weight. The movable split mold that displaces is designed to forcibly bend the sides of both glass sheets.However, when increasing the deep bending degree of the sides of the laminated glass, Although the peripheral shape can be formed into a shape that follows the movable split mold, the surface shape of the curved surface excluding the peripheral edges of the deeply bent parts of both glass plates is such that the degree of deformation of the softened glass plate creates a desired curvature surface. This causes a situation in which the glass plates cannot be followed, resulting in insufficient forming of deeply bent portions of both glass plates. Further, it is possible to locally heat the portion to be deep-bent to facilitate bending, but also due to this, the deep-bent portion of the two glass plates was still insufficiently formed.

In order to solve such a problem, as a method capable of accurately molding the surface shape, it is possible to apply a pressing method of molding by sandwiching a glass plate between a concave mold and a convex mold. In this case, since two glass plates must be molded at the same time, it is necessary to stack and accurately position and hold the two glass plates at the time of molding. However, the hanging method cannot be applied when the suspended traces are disliked, and even if the vacuum suction method is used as a method in which the suspended traces cannot be performed, the two stacked glass plates cannot be held, and as a result, a known method is used. This causes a problem that the pressing method cannot be applied as it is.

Alternatively, in order to solve such a problem, two glass plates larger than the design dimension of the laminated glass to be obtained are prepared so that the bending of the side part of the glass plate can be facilitated. An oversize processing method in which two oversized glass plates are stacked and bent at the same time to obtain a desired shape, and then the peripheral portion is cut to obtain two glass plates for laminated glass having desired design dimensions. However, there is a drawback that a cutting process after bending is required, which is troublesome and costly.

The present invention has been made in view of the above problems, and provides a method for bending a glass plate for laminated glass and a device therefor capable of reliably deep-bending the side portion of the laminated glass. It is a thing.

[Means for Solving the Problems] That is, as shown in FIG. 1 (a), a method for bending a glass plate for laminated glass, which achieves the above-mentioned problems, comprises stacking two glass plates for laminated glass. The two glass plates for laminated glass placed on the bending mold are heated and bent in the furnace during the simultaneous bending and bending process so that the sides of both glass plates are deeply bent. In the heating and forming process (A), the glass is heated up to the bending temperature of the above glass, and the two glass plates are temporarily formed into a shape substantially along the bending die by self-weight bending.・ In the press processing stage located after the bending processing stage,
An auxiliary pressing step (B) of pressing deeply bent portions of both glass plates along a deep bending corresponding portion of the bending die is provided.

Further, as shown in FIG. 1 (b), an apparatus for realizing the above-mentioned method for bending a glass plate for laminated glass has a structure in which two glass plates 1 for laminated glass are stacked and the side portions of both glass plates 1 are stacked. A device for bending a glass plate for laminated glass, which is simultaneously bent to be deeply bent, wherein the bending surface 11a is a supporting surface corresponding to the general curved portion of the laminated glass to be formed.
A fixed split mold 11 having a curved surface 12a as a supporting surface corresponding to the deep-bending portion of the laminated glass to be formed, and the end portion of the fixed split mold 11 should be moved by its own weight toward the fixed split mold 11. It consists of a movable split mold 12 that is movably provided, and two glass plates 1 for laminated glass that are stacked and placed across both split molds 11 and 12 reach the glass bending temperature environment. Bending die 10 in which movable split die 12 moves to fixed split die 11 at the time of moving, and both glass plates 1 for laminated glass in heating / bending stage in heating / bending furnace
After transferring the bending mold to heat the glass to the bending temperature of the glass, the conveying means 25 for transferring the bending mold to the next press processing stage in the heating / bending furnace, and the lateral deep bending of the laminated glass to be formed. Pressing body 37,7 with a curved surface corresponding to the part
The deep-bent portion of both glass sheets 1 having 7 and temporarily formed by self-weight bending into a shape substantially conforming to the bending die 10 at the heating / bending stage is pressed at the pressing stage at the pressing body.
Auxiliary pressing means 30 and 70 to press the movable split mold 12 with 37 and 77,
Clamping means 60 for fixing the movable split mold 12 at the set position S during the pressing operation by the auxiliary pressing means 30, 70.
It is equipped with and.

In such a technical means, as for the constitution of the heating / bending furnace for bending and forming two glass plates for laminated glass, at least the glass plate 1 to be formed is heated to the glass bending temperature. The design may be changed as appropriate as long as it includes a heating / bending stage for heat treatment and a press stage for deep bending the side portion of the glass sheet 1 that has been heat-softened. In this case, from the viewpoint of maintaining good bend formability, the side portion of the glass sheet 1 to be deeply bent is locally heated to a temperature higher than other portions in the heating / bending process stage. It is preferable to do so. For such local heating, it is preferable to dispose the local heaters on the upper side, the lower side, or both the upper and lower sides of the corresponding portions of the two stacked glass plates to be deeply bent.

Further, as the transfer means 25, if the bending die 10 can be transferred in a heating / bending furnace, the carriage may be moved along a predetermined circulation path or forward / backward path, The design may be changed as appropriate, such as using a continuous conveyor made of heat-resistant transfer rolls or transfer belts. In this case, for the conveying means 25, since the relative positional relationship between the bending die 10 and the auxiliary pressing means 30, 70 on the press processing stage must be made accurate, a mechanical positioning means is attached or controlled. Transport system 25
It is necessary to control positioning.

Further, the bending die 10 is formed by dividing the fixed split die and the movable split die with a heat-resistant material that can withstand the forming atmosphere temperature (about 600 to 750 ° C) in the heating / bending furnace. If so, the design can be changed appropriately. The fixed split mold 11 and the movable split mold 12 are configured to have a planar shape corresponding to a glass plate, a concave shape, or a ring shape having a molding surface capable of supporting the peripheral edge of the glass plate 1. Any of these may be used, but in order to keep the surface properties of the glass plate 1 smooth, reduce the number of mold marks, uniformize the heating of the glass plate, and reduce the loss of heat capacity, the surface of the glass plate 1 A ring-shaped one is preferable in that the contact area with the bending die 10 is minimized. Further, as for the movable split mold 12, the movable split mold 12 may be appropriately changed in design as long as it moves toward the fixed split mold 11 by its own weight and stops at the set position S continuous with the fixed split mold 11. The return force to the set position S can be adjusted by the constituent members and weights of the movable split mold 12 itself.

Furthermore, regarding the auxiliary pressing means 30 and 70, when the bending die 10 reaches the pressing stage, it does not interfere with the bending die 10 and the movable split die 12 set to the set position on the pressing stage. Bending surface of split mold 12 movable between
If the side portions of the glass plate 1 are pressed against the 12a by the pressing bodies 37 and 77, the design may be changed appropriately. In this case, in order to effectively suppress the generation of wrinkles on the side portion of the glass sheet 1, the side portions of the glass sheet 1 are pressed by the pressing bodies 37 and 77 from the direction substantially normal to the bending surface 12a of the movable split mold 12. It is preferable to press. And as the installation location of the pressing bodies 37, 77,
From the viewpoint that it is easy to accurately output the relative positional relationship with the bending die 10, it is preferable to install it on the conveying means 25 side, when a large number of bending dies 10 are required, or thermal efficiency in the heating / bending processing stage, Considering the durability of the pressing body support mechanism, it is preferable to install the pressing body support mechanism at an appropriate position on the pressing stage. And also regarding the shape of the pressing bodies 37, 77,
It may be formed so as to correspond to the entire deep-bent portion of the glass plate for laminated glass, but at least for deep-bent portions with large curvatures where the heating / bending stage alone tends to cause incomplete forming. It may be formed as follows. Also,
When the deep bending portion is bent to have a partially different curvature, pressing bodies 37 and 77 having pressing surfaces having different curvatures according to the bending shape are used.

Further, as for the clamp means 60, the auxiliary press means
As long as the movable split mold 12 can be fixed to the set position S on the press processing stage within the range that does not interfere with the pressing operation by 30,70, the design may be changed as appropriate, and the clamp location and number are also selected appropriately. can do.

[Operation] According to the technical means as described above, the two glass plates 1 for laminated glass placed on the bending die 10 are used for the glass processing at the heating / bending processing stage in the heating / bending furnace. After being heated to the bending temperature of 10 to be temporarily formed into a shape substantially along the bending die 10, the incompletely formed portions of the two temporarily formed glass plates 1, specifically, deep bending of both glass plates 1 The location is partially press-formed along the deep bending corresponding portion of the bending die 10 on a press processing stage located after the heating / bending processing stage in the heating / bending furnace.

[Embodiment] Hereinafter, a method for bending a glass plate for laminated glass and an apparatus therefor according to the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

Embodiment 1 FIG. 2 shows the invention applied to a glass sheet bending forming system for laminated glass in which both sides of two glass sheets for laminated glass are deep-bently formed.

In the figure, a pair of glass plates 1 for laminated glass are placed on the bending die 10 in an overlapping manner and heated together with the bending die 10 by a conveying means 25 including a carriage 26 that moves via a chain conveyor (not shown). After passing through the heating / bending processing stage ST1 and the press processing stage ST2 in the bending furnace 2, it is conveyed to the cooling processing stage ST3 outside the heating / bending furnace 2. Then, in the heating / bending stage ST1, the glass plate 1 is bent at a glass bending temperature by the heater 3 in the heating / bending furnace 2 (about 550 in the case of a normal automobile soda lime silicate glass plate).
To 650 ° C., particularly preferably about 550 to 600 ° C.) to be softened and temporarily formed along the bending die 10 by self-weight bending, and in the press processing stage ST2, the auxiliary pressing means 3 is used.
0 and the clamping means 60 partially press-molds the incompletely molded portion of the glass plate 1, and the cooling stage ST
In the case of 3, the glass plate 1 is gradually cooled on the bending die 10 at a controlled cooling rate for a predetermined time in order to prevent undesired strain from entering the press-molded glass plate 1, and then the cooling stage The glass plate 1 that has been carried out and molded from ST3 is allowed to cool.

In this embodiment, as shown in FIGS. 3 to 5, the bending die 10 is installed on the carriage 26 of the conveying means 25, and both sides of the deep bending glass plate 1 for laminated glass are provided. Ring-shaped fixed split mold 11 having a bend forming surface 11a corresponding to a general curved portion (shallow bent portion) except the above-mentioned portion, and the fixed split mold 1
1 is provided movably on both sides and has a bending forming surface 12a corresponding to the deep bending portion of the glass sheet 1 for laminated glass, and the bending forming surface 12a at the setting position S is the bending forming surface of the fixed split mold 11. It is composed of a ring-shaped movable split mold 12 connected to 11a. Then, the fixed split mold 11 is mounted on the carriage 26 via the pillar 13.
While being fixed on the upper side, both side portions in the width direction of the movable split mold 12 are swingably supported by a tip end portion of a column 15 standing on a fixed bracket 14 on a carriage 26 via a pivot 16. Furthermore,
A balance weight 17 is attached to the support portion of the movable split mold 12 via a moment arm 18 so that the movable split mold 12 is biased toward the set position S side where it is connected to the fixed split mold 11. Stopper arms 19 having an L-shaped cross section are provided on both sides in the width direction of the die 12 so as to project toward the trolley 26 side, and the stopper arms are provided in a state where the movable split die 12 reaches a set position S where the movable split die 12 is connected to the fixed split die 11. The tip of 19 abuts on a stopper wall 20 such as a bolt which is mounted on the carriage 26 so that its length can be adjusted.

Further, the auxiliary pressing means 30, as shown in FIGS. 3 to 8, has a pair of support arms 31 movably provided on the carriage 26 corresponding to the respective movable split molds 12, and the supporting arms 31. A pressing body 37 attached to the tip end side of the arm 31, a support arm drive mechanism 45 for setting the support arm 31 to an upright position in the press processing stage ST2, and a pressing body after the support arm 31 is raised in the press processing stage ST2. Pressing body drive mechanism 52 for moving 37 to the movable split mold 12 side at the set position S by a predetermined amount
It has and.

In this embodiment, the support arm 31 is formed in an inverted L shape as shown in FIGS. 4 and 5, and the base end of the support arm 31 is movable via a pivot 32. Type
The bent portion 31 of the support arm 31
A is arranged so as to face the upper region of the movable split mold 12 and move back and forth. An L-shaped rod 33 is provided on the outer side of the support arm 31 near the base end portion, and a weight roller 34 for holding the support arm 31 in the tilted position side rotates on the tip side of the rod 33. While being freely mounted, a stopper piece 35 is provided so as to project inside the base end portion of the support arm 31, and the tip end of the stopper piece 35 abuts against the frame of the carriage 26 and the standing position of the support arm 31. There is provided a stopper bolt 36 whose length can be adjusted to regulate the above.

The pressing body 37 is a plate-shaped member having a curved surface 37a corresponding to the bending surface 12a of the movable split mold 12, and is a bent portion of the pair of support arms 31 located outside each movable split mold 12. 31a
It is swingably supported within a predetermined angle range by a swing arm 39 centered on a pivot 38 provided between the tips. And
Protrusions 40 protruding in the radial direction are provided on both sides of the pivot 38, and a weight 41 for urging the pressing body 37 in a direction away from the movable split mold 12 is provided with a rod 42 on the protrusion 40. Is installed through. And again, the swing arm 39
A plate-like plate 43 is attached to a part of the mounting plate 43, and a locking bolt with a length adjustable at a predetermined position of the mounting plate 43.
44 is installed. The surface of the pressing body 37 is covered with a buffer film (not shown) such as a fiber cloth made of heat-resistant glass fiber, silica fiber, or other ceramic fiber.

The support arm drive mechanism 45 is, as shown in FIGS. 3, 4, and 6, an air cylinder serving as a drive source for a mounting frame 46 disposed below the heating / bending furnace 2.
Attach the 47 and install the piston rod 47a of this air cylinder 47.
An operating rod 49 is connected to the tip of the operating rod 49 through a coupling 48, and the operating rod 49 penetrates through the heating / bending furnace lower wall 2a, and a push-up plate 50 is provided at the tip of the operating rod 49. When the cylinder 47 is driven, the piston rod 47a is raised, and the push-up plate 50 pushes up the weight roller 34 by a predetermined amount, specifically, until the support arm 31 reaches the standing position.
In FIG. 6, reference numeral 51 is a guide for stabilizing the ascending / descending operation of the operating rod 49.

In addition, the pressing body drive mechanism 52 has a structure as shown in FIGS.
As shown in FIGS. 8 and 9, a drive motor 54 (not shown) serving as a drive source is attached to a mounting frame 53 disposed above the heating / bending furnace 2, and the drive from the drive motor 54 is performed by a ball screw. 55 to the movable bracket 56, and further, the locking bolt 44 of the movable bracket 56.
The suspension rods 57 are fixed to the respective parts corresponding to the above, and each suspension rod 57 is arranged so as to penetrate the heating / bending furnace upper wall 2b. A contact plate 58 for
When the 54 is driven, the suspension rod 57 is lowered, and the abutment plate 58 holds the locking bolt 44 by a predetermined amount, specifically, the pressing body 37 is a pair of glass with respect to the bending surface 12a of the movable split mold 12. The plate 1 is pushed down to a molding set position separated by the thickness of the plate 1.

Further, as shown in FIGS. 3, 4 and 9 to 12, the clamp means 60 is provided with a stopper arm 19 of a mounting frame 61 arranged below the heating / bending furnace 2.
The lifting / lowering air cylinder 62 is disposed at a position corresponding to the above, and the working rod 63 is connected to the tip of the piston rod 62a of the lifting / lowering air cylinder 62 via a coupling (not shown), and the working rod 63 is heated. It is placed through the lower wall 2a of the bending furnace, and a clamp claw is attached to the tip of this operating rod 63.
64, and each lifting air cylinder 62 is rotatably supported on the mounting frame 61 via an L-shaped link plate 65, and a pair of lifting air located in the width direction of the heating / bending furnace 2 is installed. Link plate corresponding to cylinder 62
65 (specifically 65a and 65b) are operatively connected by a link rod 66, and one link plate 65a connected by the link rod 66 is provided with an L-shaped link protrusion 67.
A piston rod 68a of a rotating air cylinder 68 is operatively connected to the tip of the link protrusion 67. Further, as shown in FIGS. 9 and 12, this clamping means 60 does not interfere with the stopper arm 19 when the movable split mold 12 is set to the set position S, and is indicated by an imaginary line in FIG. The clamp claw 64 is arranged at the clamp position, and in this state, first, the piston rod 62a of the lifting air cylinder 62 is advanced to raise the clamp claw 64 above the bent portion 19a of the stopper arm 19, Next, by operating the rotating air cylinder 68, the lifting air cylinder 62 is rotated, for example, by 90 °, and the clamp claw 64 is arranged at the clamp position shown by the solid line in FIG. 9, and thereafter, the lifting air cylinder 62 is moved. The piston rod 62a is moved backward to operate to clamp the stopper arm 19 between the clamp claw 64 and the stopper wall 20.

Next, the operation process of the heating / bending process stage ST1 and the press process stage ST2 shown in FIG. 2 in the system for bending a glass sheet for laminated glass according to this example will be described.

When performing bending forming of two glass plates for laminated glass, first, as shown in FIG. 13 (a), a pair of flat glass plates 1 for laminated glass are appropriately placed on the bending die 10. They are placed one on top of the other while being positioned at a predetermined position by the positioning means. At this time, since the rigidity of the glass plate 1 is large to some extent, the movable split mold 12 has the balance weight 17
It is held in a state of being defeated by the moment of. The support arm 31 of the pressing body 37 is held at the tilted position.

In this state, when the glass plate 1 is carried into the heating / bending stage ST1, the glass plate 1 is heated to the glass bending temperature and gradually softened. Then,
As shown in FIG. 13 (b), the rigidity of the glass plate 1 becomes smaller as the glass plate 1 softens, and the parts of the glass plate 1 excluding both sides gradually move to the bending surface 11 a of the fixed split mold 11. On the other hand, on both sides of the glass plate 1, the moment of the balance weight 17 overcomes the rigidity of the glass plate 1 and the movable split mold 12 gradually rises, and finally the set position S is reached. As a result, the both side portions of the glass plate 1 are deep-bently formed along the bending surface 12a of the movable split mold 12 by its own weight. However, if the degree of deep bending of the glass sheet 1 for laminated glass to be formed is large to some extent, the peripheral edges of both sides of the glass sheet 1 are deformed along the bending surface 12a of the movable split mold 12, Deformation of parts of both sides of 1 other than the peripheral edge does not follow, resulting in incomplete deep bending of both sides of the glass plate 1 due to a gap δ with respect to the original deep bending forming surface, After all, the heating / bending stage ST1 stops at the step of temporarily forming the glass plate 1.

After this, the temporarily molded glass plate 1 is pressed to the press stage.
When it is loaded into ST2, after the truck 26 stops at a predetermined position,
As shown in FIG. 13 (c), first, the support arm driving mechanism 45 of the auxiliary pressing means 30 works to push up the weight roller 34 upward to set the support arm 31 to the standing position and
The clamp means 60 clamps the stopper arm 19 to restrain the movable split mold 12 at the set position S, and then the pressing body drive mechanism 52 is driven.

At this time, before the pressing body drive mechanism 52 is driven,
As shown by the solid line in FIG. 14, the pressing body 37 stands by at a position sufficiently separated from both side surfaces of the glass sheet 1 temporarily formed by the moment based on the weight 41,
When the support arm 31 is erected, the pressing body 37 does not unnecessarily collide with the temporarily formed glass plate 1. Then, when the pressing body drive mechanism 52 is driven, as shown by a phantom line in FIG. 14, the moment of the weight 41 is overcome, the suspension rod 57 is lowered by a predetermined amount, and the contact plate 58 is locked. Depress the bolt 44 by a predetermined amount. Then, the swing arm 39
Rotates about the pivot 38 by a predetermined angle, and accordingly, the pressing body 37 moves from the bending surface 12a of the movable split mold 12 to the regular bending surface position Z separated by the thickness of the pair of glass plates 1. Revolve forward. In this case, the incompletely molded portions 1a on both sides of the glass plate 1 are locally press-molded by the pressing body 37,
As shown by the phantom line in FIG. 14, it is formed as a regular deep-bent forming part 1b.

At this stage, the glass plate 1 has been bent and formed into a regular shape, and the glass plate 1 is carried into the cooling stage ST3 shown in FIG. 2 thereafter to bend and form the two glass plates 1 for laminated glass. All processing is completed.

Example 2 The basic structure of the apparatus for bending a glass sheet for laminated glass according to FIGS. 15 to 18 is substantially the same as that of Example 1,
The auxiliary pressing means 70 different from the first embodiment is provided. still,
The same components as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted here.

In this embodiment, the auxiliary pressing means 70 is arranged above the heating / bending furnace 2 corresponding to the press processing stage ST2, and with respect to the opening 2c of the heating / bending furnace upper wall 2b. A support frame 71 that is installed so as to be able to move up and down, and a pressing body 77 that is swingably attached to this support frame 71,
It is composed of a support frame driving means 80 for moving the support frame 71 up and down, and a pressing body driving means 82 for moving the pressing body 77 by a predetermined amount to the bending surface 12a side of the movable split mold 12 at the set position S. It

The support frame 71 is constructed by arranging a reinforcing frame on a part of a U-shaped frame that opens downward and has a pair of guide arms on both sides thereof.
In addition to projecting 72, a slider 73 is attached to the tip of this guide arm 72. The support structure of the support frame 71 is a U-shaped fixed frame that opens downward between a pair of attachment channels 74 on the upper outside of the heating / bending furnace 2.
75 is installed, and the guide rail is installed inside the vertical frame of this fixed frame 75.
76 is laid, and the guide rail 76 is attached to the support frame.
The slider 73 of 71 is slidably mounted.

The pressing body 77 has the same structure as that of the first embodiment,
The support structure of the pressing body 37 is such that the center portion of a swing arm 78 is swingably supported by both lower ends of the fixed frame 71, and the push body 77 is fixed to one side of the swing arm 78. .

Further, in the support frame drive mechanism 80, an air cylinder 81 as a drive source is arranged vertically in the center of the top of the fixed frame 75, and the tip of the piston rod 81a of the air cylinder 81 is attached to the support frame 71. The auxiliary press means 70 is installed in the furnace of the heating / bending furnace or is taken out from the furnace above the furnace.

Furthermore, the pressing body drive mechanism 82 is the top frame of the support frame 71.
An air cylinder 84 as a drive source is pivotally attached to 71a via a bracket 83 in the vertical direction, and an operating rod 85 is attached to the tip of a piston rod 84a of the air cylinder 84, and the tip of the operating rod 85 is attached. A connecting bar 86 extending in the horizontal direction is provided on each side, and both ends of the connecting bar 86 are connected to the non-pressing body 77 side of the swing arm 78. The pressing body drive mechanism 82 drives the air cylinder 84 so that the piston rod 84a at the advanced position retracts by a predetermined amount.

Reference numeral 87 in the figure is provided in the middle portion of the support frame 71, and when the support frame 71 reaches the lowermost position, the heating / bending furnace opening
A lid for closing 2c, and 90 for heating the auxiliary pressing means 70 as a whole when the entire auxiliary pressing means 70 is taken out of the heating / bending furnace 2 and adjusted.
A shutter that closes the bending furnace opening 2c, and 91 is a shutter 90.
Air cylinder for driving, 92 is shutter 90 and air cylinder
A driving force transmission member that connects the piston rod 91a of 91, 9
Reference numeral 3 is a guide roller for guiding the shutter 90 along the space between the mounting channels 74.

Further, in this embodiment, as the conveying means 25 of the bending die 10, the carriage 26 driven by the chain conveyor 27 is used as in the first embodiment, but unlike the first embodiment, in the press processing stage. The carriage 26 is temporarily separated from the chain conveyor 27, and the float positioning table 100
Installed on top.

The float positioning table 100 is provided at a lower portion of the heating / bending furnace 2 and is supported by a positioning base 101 slidably supported within a predetermined range along the traveling direction of the glass plate 1. Motor to move to position,
A positioning drive mechanism 102 including a ball screw, a low stroke lifting jack 103 installed at a predetermined position on the positioning base 101, and a heating / bending furnace lower wall 2a supported by the lifting jack 103. An appropriate number of lifting columns 104 penetrating and the lifting columns 1 in the heating / bending furnace 2
A push-up plate 105 fixed to 04, and a slide mechanism 106 provided on both sides of the carriage 26 and slidably supporting the carriage 26 on the positioning base 101 along the width direction of the heating / bending furnace 2 by a predetermined range. Consists of. Then, the float positioning base 100 raises the push-up plate 105 by driving the lifting jack 103 when the carriage 26 reaches the position before the regular positioning position, and separates the carriage 26 from the chain conveyor 27. In this state, the positioning base 101 operates to move to the regular positioning position.

Next, the operation of the apparatus for bending a glass sheet for laminated glass according to this embodiment will be described.

In this embodiment, the heating / bending stage ST1
The basic operation in (1) is the same as in Example 1, and the temporarily formed glass sheet 1 is carried into the press processing stage ST2 together with the bending die 10. At this time, first, the carriage 26 that conveys the bending die 10 is positioned and installed on the float positioning base 100, and the clamping means 60 is moved in the same manner as in the first embodiment.
12 is clamped and then the auxiliary pressing means 70 is driven. Then, as shown in FIG. 19, the pressing body drive mechanism 82 operates, and the pressing body 77 moves the movable split mold 12 as shown by the solid line.
Of the glass plate 1 is pressed to a regular bending shape along the curved shape of the pressing body 77.

Further, in this embodiment, since the carriage 26 is slidably supported in a predetermined range along the width direction of the heating / bending furnace 2, the carriage 26 is conveyed in the process of being conveyed by the chain conveyor 27. Even if there is rattling and displacement in the width direction of the heating and bending furnace 2, the bending surface of the movable split mold 12
12a is corrected with reference to the regular bending surface position of the pressing body 77, and the positional deviation of the carriage 26 is effectively corrected.

[Effects of the Invention] As described above, according to the method for bending a glass sheet for laminated glass and the apparatus therefor according to claims 1 to 6, the glass sheet for laminated glass can be bent up to the bending temperature of glass. After heating and temporary shaping by a self-weight bending into a shape substantially along the bending mold, the incompletely shaped part is corrected by partial pressing, so the deep bending degree of the side part of the glass plate for laminated glass is large. Even if it is one, the side portions of the two glass plates for laminated glass can be surely deep-bent formed, and the degree of freedom of the forming shape of the glass plate for laminated glass can be increased.

Further, when deep-bending a glass plate for laminated glass with a desired curvature, there has been a problem that a complicated step of a conventional oversize processing method has to be performed. According to the invention according to, by using a glass plate for a laminated glass cut into a size corresponding to the shape of the laminated glass to be obtained, a deep-bending laminated glass having a desired peripheral curvature Can be obtained, the production of a laminated glass having such a shape can be facilitated, and the cost can be reduced.

Further, according to the method and apparatus for bending a glass sheet for laminated glass according to claims 2 and 4, in the auxiliary pressing step, the glass sheet is bent from the direction substantially normal to the bend-formed surface of the deep-bent portion of the glass sheet. Since the side portions of the glass plate are pressed against each other, it is possible to effectively reduce the occurrence of wrinkles in the deeply bent portion of the glass plate.

Furthermore, according to the bending apparatus for a glass plate for laminated glass according to the fifth aspect, since the pressing body of the auxiliary pressing means is installed on the side of the conveying means of the bending die, the bending die and the pressing body are separated from each other. The relative positional relationship can be adjusted only on the conveying means side, and the relative positional relationship between the two can be set accurately accordingly.
The reliability of press molding by the auxiliary pressing means can be improved.

Further, according to the bending apparatus for a glass plate for laminated glass according to claim 6, since the auxiliary pressing means is installed on the pressing stage, the glass plate and the bending die are assisted in the heating / bending stage. It is not necessary to heat the pressing means, and the heat efficiency in the heating / bending processing stage can be improved accordingly, and deterioration due to heat of the auxiliary pressing means can be suppressed and durability can be improved. In the case of a type that mass-produces bent laminated glass using a bending die, it is not necessary to provide an auxiliary pressing means corresponding to each bending die in the conveying means. The number of parts can be reduced, and the device configuration can be simplified accordingly.

[Brief description of drawings]

FIG. 1 (a) is an explanatory view showing a method for bending a glass sheet for laminated glass according to the present invention, and FIG. 1 (b) is a schematic configuration of a bending apparatus for a glass sheet for laminated glass according to the present invention. FIG. 2 is a schematic explanatory diagram showing a bending forming system of a glass plate for laminated glass incorporating a first embodiment of the apparatus for bending a glass plate for laminated glass according to the present invention, FIG. FIG. 4 is a perspective view of an essential part thereof, FIG. 4 is a view seen from the direction IV in FIG. 3, FIG. 5 is a half plan view of FIG. 4, and FIG. 6 is an auxiliary pressing means used in the first embodiment. FIG. 7 is an explanatory view showing the details of the support body drive mechanism, and FIG. 7 is a view showing details of the pressing body drive mechanism of the auxiliary pressing means used in the first embodiment.
FIG. 8 is a plan view of the same as seen from the direction VII, FIG. 8 is a plan view thereof, FIG. 9 is a plan explanatory view showing an arrangement position of the clamp claws of the clamp means used in the first embodiment, and FIG. FIG. 11 is an explanatory view showing the details of the drive system of the clamping means, FIG. 11 is a view seen from the direction of the XI direction in FIG. 10, and FIG. 12 is a perspective view showing the details of the essential parts of the clamping means according to the first embodiment. 13 (a) to 13 (c) are explanatory views showing a bending process of the glass plate for laminated glass according to Example 1, and FIG. 14 shows details of the auxiliary pressing process of FIG. 13 (c). Explanatory drawing and FIG. 15 show Embodiment 2 of the apparatus for bending a glass plate for laminated glass according to the present invention.
FIG. 16 is a partial perspective view of the auxiliary pressing means used in Embodiment 2 as seen from the XVI direction in FIG. 15, and FIGS. 17 and 18 are XVII in FIG. And FIG. 19 is an explanatory view showing the details of the auxiliary pressing step in Example 2 as seen from the direction of arrow XVIII. [Explanation of symbols] ST1 …… Heating / bending stage ST2 …… Pressing stage 1 …… Glass plate 2 …… Heating / bending furnace 10 …… Bending die 11 …… Fixed split die 11a …… Bending forming surface 12 …… Movable split mold 12a …… Bending surface 25 …… Conveying means 30 …… Auxiliary pressing means 31 …… Support arm (support) 37 …… Pressing body 45 …… Support arm drive mechanism (support drive mechanism) 52 …… Pressing body drive mechanism 60 …… Clamping means 70 …… Auxiliary pressing means 71 …… Supporting frame (supporting body) 77 …… Pressing body 80 …… Supporting frame driving mechanism (supporting body driving mechanism) 82 …… Pressing body Drive mechanism

Claims (6)

[Claims] 1. When two glass plates (1) for laminated glass are stacked and simultaneously bent and formed so that the side portions of both glass plates (1) are deeply bent, they are placed on a bending die (10). The two glass plates (1) for laminated glass are heated to the glass bending temperature in the heating / bending stage (ST1) in the heating / bending furnace (2), and the two glass plates ( Heating temporary forming step (A) of temporarily forming 1) into a shape substantially along the bending die (10) by self-weight bending, and heating / bending processing stage (ST1) in the heating / bending furnace (2). Press processing stage (S
At T2), a method for bending a glass sheet for laminated glass, comprising: an auxiliary pressing step (B) of pressing deep-bending portions of both glass sheets (1) along a deep-bending corresponding portion of a bending die. 2. An auxiliary pressing step (B) of pressing two glass plates (1) for laminated glass in a pressing process stage (ST2) in a direction substantially normal to a deeply bent portion of a forming curved surface. The method for bending a glass plate for laminated glass according to claim 1, wherein 3. A glass sheet bending apparatus for laminated glass, wherein two glass sheets (1) for laminated glass are stacked and simultaneously bent and formed so that the side portions of both glass sheets (1) are deeply bent. There is a fixed split mold (11) having a bending surface (11a) corresponding to the general curved portion of the glass plate (1) for laminated glass, and deep bending of the glass plate (1) for laminated glass to be molded. Has a bending surface (12a) corresponding to the part and has a fixed split mold (1
It consists of a movable split mold (12) that is movably provided at the end of 1) by its own weight so as to move in the direction connected to the fixed split mold (11).
When the two glass plates (1) for laminated glass placed over both split molds (11, 12) in a stacked state reach the glass bending temperature environment, the movable split mold (12 ) Is a fixed split type (1
Bending die (10) that moves to the set position (S) connected to 1)
Then, the bending die (10) was transferred to heat both glass plates (1) for laminated glass to the glass bending temperature in the heating / bending processing stage (ST1) in the heating / bending furnace (2). After that, the conveying means (2) for transferring the bending die (10) to the next press processing stage (ST2) in the heating / bending furnace (2).
5) and a pressing body (37, 77) having a curved surface corresponding to the lateral deep bending portion of the glass plate (1) for laminated glass,
Bending die (10) at the heating / bending stage (ST1)
The deep bending points of both glass plates (1) that were temporarily formed by self-weight bending into a shape that was roughly aligned with the press processing stage (ST2)
An auxiliary pressing means (30, 70) for pressing the pressing body (37, 77) toward the movable split mold (12), and the movable split mold during the pressing operation by the auxiliary pressing means (30, 70). An apparatus for bending a glass sheet for laminated glass, comprising: a clamping means (60) for fixing (12) at a set position (S). 4. The pressing body (3) is formed on a deeply bent portion of the two glass plates (1) temporarily formed by a press processing stage (ST2).
The glass for laminated glass according to claim 3, further comprising auxiliary pressing means (30, 70) for pressing the movable split mold (12) in a direction substantially normal to the bending surface of the movable split mold (12). Plate bending equipment. 5. The auxiliary pressing means (30) is a conveying means (25).
A support body (31) that is provided so as to be up and down freely, and a pressing body (37) that is swingably supported on the support body (31),
When the bending die (10) reaches the pressing stage (ST2), the pressing body (37) is arranged so as to be arranged at a position facing the bending surface (12a) of the movable split die (12). 3
The support drive mechanism (45) that moves 1) from the tilted position to the standing position and the bending die (10) are used for the press processing stage (ST).
When it reaches 2), the pressing body (37) is moved to the movable split mold (1
The bending apparatus for a glass sheet for laminated glass according to claim 3, further comprising: a pressing body driving mechanism (52) for moving the bending molding surface (12a) side by a predetermined amount. 6. An auxiliary pressing means (70) is a support (7) that is installed in a press processing stage (ST2) so as to be movable back and forth.
1), a pressing body (77) swingably supported on the tip side of the support body (71), and the pressing body (77) when the bending die (10) reaches the press processing stage (ST2). ) The support driving mechanism (80) for advancing the support (71) so that the movable mold (12) is arranged at a position facing the bending surface (12a) of the movable split mold (12), and the bending mold (10) is pressed. Stage (ST2)
And a pressing body driving mechanism (82) for moving the pressing body (77) toward the bending molding surface (12a) of the movable split mold (12) by a predetermined amount when the pressing body (77) is reached. An apparatus for bending a glass sheet for laminated glass according to claim 3.