JPH04214039A - Method and device for bending glass plate and bending mold used therein - Google Patents

Abstract

PURPOSE:To prevent the spring up of movable segmental molds at the time of press forming the glass plate imposed on the bending molds of a segmental type by auxiliary press members. CONSTITUTION:The method and device for bending the glass plate using the bending molds positioned with the turning axis 10 of the bending molds in such a manner that the moment of the force around the turning axis 10 applied on the movable segmental molds 26 at the time of press forming heads in the direction where the development of the bending molds is hindered.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a method and apparatus for bending a glass plate in a heating furnace, and more particularly, to a method and an apparatus for bending a glass plate, which is optimal for deep bending the sides of a glass plate. Concerning improvements to the device.

0002

[Prior Art] Generally, laminated glass is made by laminating two sheets of laminated glass with a plastic interlayer film such as a polyvinyl butyral film, and is widely used from a safety standpoint, especially as windshield windows of automobiles. .

By the way, this type of laminated glass is usually required to have a curved shape for reasons of automobile design, so two sheets of laminated glass for laminated glass are formed by bending flat sheets as appropriate. It becomes necessary to do so. At this time, if the two laminated glass sheets are molded separately, the curved shapes of the two laminated glass sheets will be slightly different. There are disadvantages in that the bonding is not done through an interlayer film, bubbles are generated on the bonding surface, or bubbles are generated on the bonding surface of the laminated glass during use, and the glass peels off. For this reason, conventionally, when manufacturing laminated glass, a method has been adopted in which two sheets of laminated glass are stacked and bent at the same time.

[0004] Conventional methods for bending laminated blank glass for laminated glass include constructing a bending die corresponding to the bending surface of the laminated glass, and placing two pieces of laminated blank glass for laminated glass on this bending die. The bending molds placed one on top of the other are carried into a heating furnace, and both laminated blank glass sheets are heated to their glass softening temperature, and as both glasses soften, both sheets are laminated along the bending surface of the bending mold. It is known that the blank glass is bent under its own weight.
9-10332).

In such a method, when it is necessary to deeply bend the side part of the laminated glass, a ring-shaped fixed split mold having a bending surface corresponding to the intermediate curved part of the laminated glass, and a A ring-shaped movable split mold that has a bending surface corresponding to the deep bending part of the side part of the glass and is provided on both sides or one side of the fixed split mold so as to be movable under its own weight in a direction that connects to the fixed split mold. The above-mentioned bending mold is constructed with the above-mentioned bending mold, and after developing the bending mold by placing two flat glass blanks on top of each other on the bending mold, the blank glass is carried into a heating furnace and heated. A self-weight bending method has already been provided in which the movable split mold is moved in a direction continuous with the fixed split mold as both glasses soften, and the sides of both glasses are deeply bent by the movable split mold.

[0006]

[Problem to be Solved by the Invention] However, in such a conventional method of bending and forming blank glass for laminated glass, when deep bending the sides of double-laminated blank glass for laminated glass, it is difficult to bend the sides of the blank glass for laminated glass due to its own weight. The movable split mold is used to forcibly bend the sides of both base glasses, but when increasing the degree of deep bending of the sides of the laminated glass, it is necessary to Although the peripheral edge shape can be formed into a shape that follows the movable split mold, the surface shape of the curved portion of both base glasses, excluding the periphery of the deep bending part, depends on the degree of deformation of the softened base glass to create the desired curvature surface. This results in a situation where the deep bending portions of both base glass sheets become insufficiently formed. It is also possible to locally heat the part to be bent deeply to make it easier to bend, but even this is still insufficient.

[0007] In order to solve such problems, it is possible to apply a press method in which a glass plate is sandwiched between a concave mold and a convex mold to form the surface shape accurately. In the case of laminated glass, since two pieces of laminated blank glass must be molded at the same time, it is necessary to accurately position and hold the two pieces of laminated blank glass during molding. However, even when attempting to hold two pieces of laminated blank glass using known methods such as hanging or suction, it was not possible to accurately position and hold both pieces of laminated blank glass, and in the end, the above pressing method was not used. There was a problem that it could not be applied as is.

FIG. 13 shows an example of a split type bending die for bending laminated glass sheets under their own weight. This is placed on a trolley 126 of a conveying means, and is a ring-shaped fixed split mold 1 having a bending surface 111a corresponding to the central curved part excluding both sides of the laminated blank glass 101 which is deep bent.
11, and a bending surface 112a which is movably provided on both sides of the fixed split mold 111 and corresponds to the deep bending part of the laminated blank glass 101, and when this bending surface 112a is in the set position, the fixed split mold 111 is movably provided. Bending surface 111a
It is composed of a ring-shaped movable split mold 112 connected to the mold.

[0009] The fixed split mold 111 is attached to the support column 11.
The movable split mold 112 is fixed on the cart 126 via a pivot 116, while both sides in the width direction of the movable split mold 112 are swingable via a pivot 116 at the tip of a support 115 erected on the fixed bracket 114 on the cart 126. is supported by. Furthermore, a movable split mold 112 is attached to the support portion of the movable split mold 112.
A balance weight 117 is attached via a moment arm 118 so that the balance weight 117 is biased toward the set position that is connected to the fixed split mold 111.

[0010] In FIG. 13, (a) shows the flat laminated blank glass placed on a bending mold before heating the laminated blank glass, and FIG. 13(b) shows the laminated blank glass before heating. This shows the state in which the bending process has been completed. Further, FIG. 13(c) is a schematic plan view for explaining the split state of this bending die.

In such a bending mold, before a flat glass plate is placed on it, the movable split mold is in a position connected to the fixed split mold, but when a flat glass plate is placed on top of it, Due to the weight of the glass, the movable split mold automatically breaks, resulting in Figure 13(a)
). In this case, as long as the movable split mold is one that moves in the direction connected to the fixed split mold by its own weight and stops at the set position connected to the fixed split mold, the design may be changed as appropriate, and the movable split mold moves to the set position of the movable split mold. The return force can be adjusted by the components and weights of the movable split mold itself.

When a glass plate placed on such a split mold type bending mold is press-formed from above at a portion corresponding to the deep bending part using an auxiliary press member, the portion close to the fixation of the movable split mold is pressed. This may cause phenomena such as popping up, which may cause defects such as local deformation of the glass plate. FIG. 3 is a conceptual diagram showing this situation.

1 is a press load acting surface, 2 is a bending mold, and 3 is a
is the rotation axis of the movable split mold. In such a normal bending die, a moment of force is applied to the movable split die around the rotation axis due to a press load in a direction in which the bending surface of the movable split die moves away from the bending surface of the fixed split die. For this reason, the above-mentioned bounce-up occurs.

In order to solve this problem, the blank glass is bent under its own weight on a so-called split-type bending die consisting of a movable split die and a fixed split die, as described above, to accommodate the deep bends on the sides of the blank glass. In addition, a method has been proposed in which a movable split mold is clamped to a fixed split mold and pressed by an auxiliary press member from above the blank glass to completely form the deep bent part. This clamp is designed to prevent the movable split die from opening when the press is pressed, and in order to actually achieve sufficient clamping,
For example, when viewed from the fixed split mold, the movable split mold is supported by pushing up the outside of the rotating shaft, and when viewed from the bending surface of the movable split mold, the bending surface of the movable split mold is inside the rotating shaft. It is necessary to apply a force in a direction continuous with the bending surface.

FIG. 2 is a side view showing an example of a bending die having such a clamp configuration. In the figure, 4 is a weight clamp jig, 5 is a push-up bar clamp jig, 6 is a push-up bar, 10 is a hinge, 13 is an auxiliary press member, 15 is a weight, 16 is a bending die, and 17 is a glass plate.

However, such support by pushing up is performed from outside the furnace in order to avoid exposing the drive section to the high temperature of the heating furnace, so it is difficult to adjust the pushing up height of the pushing up rod 6 for each bending die. There was a problem in that local deformation tended to occur in the glass plate portion corresponding to the boundary between the movable split mold and the fixed split mold.

[0017]

[Means for Solving the Problems] The present invention has been made in order to solve the above-mentioned problems, and when bending and forming a glass plate into a predetermined curved shape with deeply bent sides, it is possible to a fixed split mold having a bending surface corresponding to the intermediate curved portion; and a bending surface of the fixed split mold having a bending surface corresponding to the side portion of the predetermined shape, and the bending surface of the fixed split mold having a bending surface corresponding to the side portion of the predetermined shape. a placing step of placing a glass plate on a bending mold having a movable split mold provided on at least one side of the fixed split mold so as to be rotatable in a direction continuous with the glass plate; A temporary forming process in which the glass plate is heated in a heating furnace to a temperature at which the glass plate can be bent, thereby bending it by its own weight so as to substantially follow the forming surface of the bending die, and a side surface of the glass plate to be formed. In a glass sheet bending method that includes a press forming process in which a deep bending part is press-formed from above by an auxiliary press member, the moment of force around the rotation axis applied to the movable split die during press forming is The present invention provides a method for bending and forming a glass plate, characterized in that the rotation axis of the bending die is positioned so as to face in a direction that prevents the bending die from unfolding.

[0018] Furthermore, when bending a glass plate into a predetermined curved shape with deeply bent side portions, a fixed split mold having a bending surface corresponding to an intermediate curved portion of the predetermined shape; on at least one side of the fixed split mold so that the bending surface has a bending surface corresponding to the bending surface of the fixed split mold, and the bending surface is rotatable around a rotation axis in a direction continuous with the bending surface of the fixed split mold. A movable split mold provided,
A mounting step of placing a glass plate on a bending mold having The preforming process involves bending the glass plate under its own weight along the curve, and an auxiliary press member is applied from above to the side deep bending part of the glass plate to be formed. The present invention provides a method for bending and forming a glass sheet, which includes a press-forming step of pressing and press-forming in a direction that prevents expansion.

[0019] Furthermore, the above method for bending a glass plate is characterized in that when placing the glass plate on the bending die, force is applied to the movable split die of the bending die to forcibly expand the bending die. The present invention provides a method for bending and forming a glass plate.

[0020] Also, there is provided an apparatus for bending a glass plate into a predetermined curved shape with deeply bent side portions, comprising: a fixed split mold having a bending surface corresponding to an intermediate curved portion of the predetermined shape; at least one side of the fixed split mold so that the bending surface has a bending surface corresponding to the side part of the fixed split mold, and the bending surface is rotatable about the rotation axis in a direction continuous with the bending surface of the fixed split mold. and a movable split die provided at the part, and the rotating shaft is such that the moment of force around the rotating shaft applied by the press load by the auxiliary press member is
A bending mold that is positioned so as to apply in a direction that prevents the bending mold from unfolding, and a portion of the glass plate placed on the bending mold that corresponds to the deep lateral bending part to be formed. The present invention provides a glass plate bending and forming apparatus characterized by having an auxiliary press member provided above and capable of being raised and lowered.

[0021] Furthermore, the glass plate bending and forming apparatus described above further comprises means for applying force to the movable split die of the bending die to forcibly expand the bending die. It provides:

[0022]Furthermore, the present invention is a bending mold for bending a glass plate into a predetermined shape by placing a glass plate thereon and heating it, the fixed split mold having a bending surface corresponding to an intermediate curved portion of the predetermined shape. The fixed split mold has a mold and a bending surface corresponding to the side portion of the predetermined shape, and the bending surface is rotatable around a rotation axis in a direction continuous with the bending surface of the fixed split mold. and a movable split mold provided on at least one side of the bending mold, and the rotating shaft is located outside of both sides of the movable split mold when the bending mold is viewed from above. This provides a bending die for bending.

[0023] According to the above-mentioned technical means, the glass plate placed on the split-type bending mold having a movable split mold and a fixed split mold can be heated and bent in a heating and bending furnace. After being heated to the glass softening temperature in the processing stage and temporarily formed into a shape that roughly follows the bending die by its own weight, the incompletely formed parts of the temporarily formed glass plate, specifically the deep bending parts of the glass plate, are In the press processing stage located after the heating and bending processing stage in the heating and bending furnace, the material is partially press-formed along the deep bend corresponding portion of the bending die.

[0024] In such a technical means, the configuration of the heating/bending furnace used to bend and form a glass plate is at least capable of heating/bending the laminated base glass to be formed to the softening temperature of the glass. The design may be modified as appropriate as long as it includes a processing stage and a press processing stage for deep bending the side portion of the heat-softened laminated blank glass using an auxiliary press member. In this case, from the viewpoint of maintaining good bending formability, it is necessary to locally heat the side part of the glass plate to be deep bent to a higher temperature than other parts in the heating bending processing stage. It is preferable to For such local heating, it is preferable to arrange local heaters close to the upper side, the lower side, or the upper and lower sides of the portion of the glass plate to be deep bent.

[0025] Further, as the above-mentioned conveying means for the glass plate,
As long as the bending mold can be transported in the heating/bending furnace, the cart may be moved along a predetermined circulation path or forward/backward path, or it may be moved from a heat-resistant transport roll or belt, etc. The design may be changed as appropriate, such as by using a continuous conveyor. In this case, regarding the conveyance means, since the relative positional relationship between the bending mold on the press processing stage and the auxiliary press means equipped with the auxiliary press member must be accurate, mechanical positioning means may be attached or It is preferable to control the positioning of the conveyance means by a control system.

Furthermore, the above-mentioned auxiliary press means can press the laminated blank glass of the bending die set at the set position on the press processing stage without interfering with the bending die when the bending die reaches the press processing stage. The design may be changed as appropriate as long as the auxiliary press member presses the side portion of the laminated blank glass from a direction substantially perpendicular to the bending surface corresponding to the intermediate curved portion to be formed. The installation location of the auxiliary press member is determined from the viewpoint of making it easy to accurately determine the relative positional relationship with the bending die, and considering the thermal efficiency of the heat treatment stage and the durability of the auxiliary press member support mechanism. Preferably, it is placed at a suitable location on the press stage above the bending die.

Furthermore, the shape of the auxiliary press member may be pipe-shaped, or may be formed to correspond to the entire deep bending part of the laminated glass, but at least it can be heated and bent. It is only necessary to form the molding portion corresponding to a portion with a small curvature of deep bending, where forming is likely to be incomplete with the stage alone. Further, when bending the deeply bent portion into a shape with partially different curvatures, an auxiliary press member having a press surface having a different curvature according to the bent shape is used.

FIGS. 1-(a) and 1-(b) are a plan view and a side view showing the bending die used in the present invention and the preferred positional relationship between the bending die and the auxiliary press member, respectively.
It is. In the figure, 11 is a bending die, 13 is an auxiliary press member, and 7
indicates the trolley on which the bending mold is placed.

In the bending mold used in the method of the present invention, when a glass plate is placed on the bending mold and further pressed from above by the auxiliary press member 13, the rotation axis 1 applied to the movable split mold
4 so that the bending surface of the movable split mold is directed in the direction along the bending surface of the fixed split mold, rather than in the direction in which the bending mold unfolds, thereby preventing the bending mold from unfolding. Make it. Specifically, by adjusting the way the press load is applied by the auxiliary press member and the position of the rotation axis 14, that is, the hinge 10 around which the movable split die rotates, for example, the movable split of the force moment is adjusted. You can adjust the way it applies to the mold as described above.

In particular, as shown in FIG. 1, if the rotating shaft 14 is located outside of the movable split die when viewed from above the bending die, the press action surface 8 on the movable split die will be Rotation axis 1
4, it will always be on the inside of the bending die, which is preferable because force can be applied in a direction that prevents the bending die from unfolding, regardless of how the press load is applied by the auxiliary press member 13. Here, since the hinge 10 is located on the outer side of the bending mold than the pressing surface 8, the glass bending moment can be adjusted by arranging the counterweight 9 further outside of the rotation axis 14. In addition, the stopper 12 is a stop part that supports the locking part 22 of the movable split die at a position where the bending surface of the movable split die is connected to the bending surface of the fixed split die, as shown in FIG. 1(b). 20, and the stop 20 is preferably made of a bolt or the like whose height can be adjusted. Stopper 1
By using 2, it is possible to prevent the movable split mold from rotating beyond the position where its molding surface is continuous with the molding surface of the fixed split mold.

A method and apparatus for bending a glass plate under its own weight using such a bending die will be described below. FIG. 14 is a conceptual side view showing this situation. When a flat glass plate is not placed on the bending mold, the molding surface of the movable split mold 26 of the bending mold is continuous with the molding surface of the fixed split mold 25 (FIG. 14(a)).

The bending die used in the present invention has a structure that prevents the bending die from breaking even if force is applied from above to the movable split die, so even if the flat glass plate 24 is placed on the bending die, the bending die will not break easily. , the bending mold usually does not break. Therefore, when placing the glass plate 24 on the bending die, the force applying means 23 is applied to the movable split die 26.
It is preferable to apply more force and forcibly break the bending mold. Forcibly breaking the bending die may be done after placing the glass plate 24 on the bending die, or may be done before placing the glass plate 24 on the bending die (see FIG. 14(b). ) ).

Once the bending die is broken, if a glass plate is placed on top of it, it will remain broken due to the frictional force between the glass plate and the bending die and the rigidity of the glass plate (
Figure 14(c)). When the glass plate 24 is softened by heating, the bending mold is originally in a balanced state in which the molding surface of the movable split mold 26 is connected to the molding surface of the fixed split mold 25, so the movable split mold gradually softens. The mold 26 moves, and finally the molding surface of the movable split mold 26 is connected to the molding surface of the fixed split mold 25 (FIG. 14(d)).

The force applying means 23 may be of any type as long as it can apply force to the movable split die 26 to forcibly break the bending die. For example, a counterweight 9 attached to the movable split mold 26 can be easily used by applying force from above with a hammer made of rubber or the like to break the bending mold.

In the present invention, since the moment of force applied to the movable split die 26 by the press presses the movable split die 26 against the stopper 12, the moment of force applied to the movable split die 26 prevents the bending die from unfolding. It will join in the direction that will hinder it. Therefore, the movable split mold can be automatically clamped to the fixed split mold without employing an insufficient clamping structure as in the prior art.

As is clear from this feature, the present invention is extremely effective when simultaneously bending two pieces of laminated blank glass, but is not necessarily limited thereto, and is also effective as a processing method for bending a single piece of glass. It is something like that. The following mainly describes the case where two pieces of laminated blank glass are bent and formed at the same time.

According to the above-mentioned technical means, a glass plate placed on a split-type bending mold having a movable split mold and a fixed split mold can be heated and bent in a heating and bending furnace. After being heated to the glass softening temperature in the processing stage and temporarily formed into a shape that roughly follows the bending die by its own weight, the incompletely formed parts of the temporarily formed glass plate, specifically the deep bending parts of the glass plate, are In the press processing stage located after the heating and bending processing stage in the heating and bending furnace, the material is partially press-formed along the deep bend corresponding portion of the bending die.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail based on the embodiments shown in the accompanying drawings, taking as an example the method and apparatus for bending a laminated blank glass for laminated glass according to the present invention.

FIG. 4 shows the present invention applied to a bending system for laminated blank glass for laminated glass, which deep bends both sides of the laminated blank glass for laminated glass.

In the same figure, a pair of laminated blank glasses for laminated glass are stacked on a bending die 110 and moved by a cart 126 via a chain conveyor (not shown).
After passing through a heating/bending processing stage ST1 in the heating/bending furnace 102 and a press processing stage ST2 together with the bending mold 110 by a conveying means 125 consisting of a conveying means 125, the cooling processing stage S outside the heating/bending furnace 102 is performed.
It is designed to be transported to T3.

[0041] Then, in the heating/bending treatment stage ST1, the laminated blank glass 101 is heated to a glass softening temperature (550 to 6
It is heated to 50℃) and softened, and then bent by its own weight into mold 1.
In the press processing stage ST2, the incompletely formed part of the deeply bent part of the laminated blank glass 101 is partially press-formed by the auxiliary press means 130, and in the cooling processing stage ST3, press forming is performed. In order to prevent undesirable distortion from occurring, the laminated blank glass 101 is gradually cooled while being moved on a bending mold 110 at a controlled cooling rate for a predetermined period of time, and then transferred to a cooling treatment stage. The two laminated blank glass sheets 101 that have been carried out from ST3 and formed are left to cool.

The bending mold for self-weight bending on which two sheets of laminated raw glass are placed is made of a heat-resistant material that can withstand the forming temperature (580 to 700° C.) of the glass sheets in the heating and bending furnace. It is preferable to use a type having a bending surface corresponding to the intermediate curved part to be formed and a bending surface corresponding to the deep bending part to be formed. The structure of such a bending mold may be either a planar shape that is compatible with the laminated raw glass or a ring-shaped shape that can support the periphery of the laminated raw glass, but in order to maintain the smooth surface of the laminated raw glass. A ring-shaped one is preferable in that it minimizes the contact area between the surface of the laminated blank glass and the bending die. In the present invention, the bending die is shown in FIG.
The one shown in is typical. In order to avoid deformation due to pressing force, it is preferable to make the core rod of the hinge portion 20φ or more to strengthen the structure around the hinge.

The bending mold used in the present invention has a structure that prevents the bending mold from breaking even if force is applied from above to the movable split mold, so when placing the laminated blank glass on the bending mold,
It is preferable to apply force to the movable split mold with a rubber hammer or the like to forcibly break the bending mold. Once the bent mold is broken,
The broken state is maintained by the frictional force between the glass plate and the bending die and the rigidity of the glass plate.

[0044] Furthermore, on the outside of the side edge of the laminated blank glass on the periphery of the movable split mold corresponding to the deep bending part to be formed of the laminated blank glass of the bending die, there is a part protruding from the end of the bending die as shown in FIG. It is preferable to attach a taper ring 140 having a taper angle corresponding to the curved shape of the periphery of the laminated blank glass. Alternatively, a structure may be adopted in which the peripheral edge of the mold itself protrudes from the end.

The taper ring 140 or the contact surface of the protrusion on the periphery of the mold with the lower surface of the end of the laminated blank glass has a molding surface that matches the design shape of the desired laminated glass, and the laminated blank is formed during press molding. The shape is such that it supports the edge of the glass plate so that it can be molded into a desired shape. Therefore, when temporarily forming two pieces of laminated raw glass by bending them under their own weight on a bending die, as shown in FIG.
, 191 are in contact with the supporting surface of the tapered ring, and the lower surface of the laminated glass plate 191 and the tapered ring 1
40 is supported with a gap between the molding surface 142 of the bending mold 112 and the molding surface 143 of the bending mold 112 during temporary molding.
It is also possible to prevent mold marks from forming inside the end of the lower surface of the laminated blank glass due to contact with the molding surface 142 of the taper ring 140.

Thereafter, the periphery of the laminated blank glass is pressed by the auxiliary press member 152, so that the periphery is formed into the forming surface 142 of the tapered ring 140 and the bending die 112.
A desired shape that matches the molding surface 143 of the end portion is obtained. The tapered ring 140 or the protruding portion on the periphery of the mold may be provided in the necessary deep bending portion of the bending mold, and does not necessarily need to be provided on the entire side of the bending mold.

Furthermore, the auxiliary press means 160 shown in FIG.
An auxiliary press member 152 is provided at a desired position above a portion corresponding to the deep bending portion of the laminated blank glass of the bending mold, and this auxiliary press member 152 is connected to the press base 1.
63, and is moved up and down by a press cylinder (not shown), and when the press cylinder descends, the deeply bent part of the laminated glass is press-formed, and as the press cylinder rises, the press It's starting to feel liberating. When the auxiliary press member 152 presses the deeply bent part of the laminated blank glass, the contact area between the auxiliary press member 160 and the laminated blank glass is pressed so that the occurrence of wrinkles, scratches, and press marks on the laminated blank glass due to the press is reduced. It is more preferable to press in the linear direction.

The above-mentioned auxiliary press member 152 is coated with glass fiber or silica to cover the contact surface of the auxiliary press member with the glass in order to prevent press marks from being formed on the laminated base glass when the laminated base glass is press-molded. It is preferable to provide a heat insulating cloth 170 made of fiber, ceramic fiber, metal fiber, or the like.

In the example shown in FIGS. 6 to 8, two stacked laminated glass sheets 180 are bent into a split type bending mold 181.
When bending the laminated blank glass 180 by bending it by its own weight, the deep bent portion 18 of the laminated blank glass 180
This is an example in which a local heating heater 183 is provided above the laminated blank glass 180 at a portion corresponding to the deep bending portion so that the bending process of 2 is made easier. By using this local heating heater to raise the temperature of the deeply bent portion of the laminated blank glass 180 to a higher temperature than other portions, for example, about 10° C. to 100° C., the bending process by the weight of the deeply bent portion is facilitated. Such local heating heaters may be placed above or below the two stacked laminated glass sheets, or may be placed both above and below the laminated glass sheets.

[0050] The shape of the local heating heater is appropriately determined depending on the desired shape of the deep bending part to be bent, and may be linear in the length direction, or may be straight in the deep bending part. It may be curved so that the polygonal lines are curved, or it may be a more complicated shape. The examples shown in FIGS. 6 and 7 are examples of the latter.

[0051] Furthermore, when heating a laminated blank glass plate locally using a local heating heater, if you want to prevent the local heating from reaching other parts, as shown in Figure 8, it is possible to It is also possible to place a heating member 184 in a desired area to cut off undesirable radiant heat from the local heater 183.

In the method of the present invention, a laminated blank glass sheet to be bent and formed as shown in FIG. , it is also possible to form colored bands. In this way, if colored ceramic color ink is printed on the press-formed area and baked onto the surface of the laminated glass in the heating process before press-forming, even if the colored ceramic color ink is printed on the surface of the laminated glass during pressing, the colored ceramic color ink will be printed on Alternatively, even if press marks and scratches occur on the periphery of the laminated blank glass, the colored band baked with the colored ceramic color ink makes the press marks and scratches less noticeable, and optical defects in appearance can be hidden.

As shown in FIG. 9, colored ceramic color ink is printed on the upper surface of the deeply bent portion of the upper laminated blank glass 190 of the two stacked laminated blank glasses 190 and 191 to form a colored band 192. In this case, the colored ceramic color ink may adhere to the heat-resistant cloth covering the press surface of the auxiliary press member during pressing, reducing the life of the heat-resistant cloth, or the colored ceramic color ink may leave press marks on the surface of the colored band. Occur. In order to prevent this, a heat-resistant mold release agent is printed on the printed surface of the colored ceramic color ink, and the mold release agent layer 193 is
, and the mold releasability between the baked colored band of the colored ceramic color ink and the heat-resistant cloth of the auxiliary press member during press molding can be improved. Examples of such heat-resistant mold release agents include boron nitride and carbon.

Alternatively, as an improvement to extend the life of the heat-resistant cloth covered with the auxiliary press member as described above, or to improve the pressing surface of the colored band on which the colored ceramic color ink is baked, two sheets as shown in FIG. After preforming the stacked laminated glass sheets 190 and 191 by bending under their own weight, the upper and lower laminated glass sheets 19 are formed prior to press forming.
0,191 is reversed, and a colored band 192 of colored ceramic color ink is formed on the laminated blank glass 1.
90 on the lower side, and the peripheral portion of the laminated blank glass 191 on which the colored band is not applied may be press-molded to prevent the colored ceramic color ink from adhering to the heat-resistant cloth.

[0055]

As explained above, according to the laminated glass bending method and apparatus of the present invention, a glass plate for laminated glass is heated to the glass softening temperature and is formed into a movable split mold by the self-weight bending method. After temporarily forming the split mold into a shape that roughly follows the bending die of the split type having a fixed split mold, pressing automatically fixes the movable split mold to the fixed split mold and prevents imperfections in the laminated blank glass. Since the forming part is corrected by partial pressing, even if the side of the laminated glass is deeply bent, the part of the movable split mold adjacent to the fixed split mold will not spring up during press molding. This allows the side portions of the laminated glass to be reliably deep bent and formed, increasing the degree of freedom in shaping the shape of the laminated blank glass.

[Brief explanation of the drawing]

FIG. 1: Top and side views of a bending die suitable for the method and apparatus of the invention.

[Figure 2] Side view of conventional bending die

[Fig. 3] Conceptual diagram showing how the conventional bending die bends

FIG. 4 A schematic explanatory diagram showing a bending and forming system for laminated blank glass incorporating an embodiment of the bending and forming apparatus for laminated blank glass for laminated glass according to the present invention.

FIG. 5 is an overall schematic explanatory diagram of the portion related to the auxiliary press means of the bending and forming apparatus for laminated blank glass for laminated glass according to the embodiment of the present invention.

[Figure 6] Schematic explanatory diagram showing a local heating method for laminated blank glass

[Figure 7] Schematic explanatory diagram showing the local heating method for laminated blank glass

[Figure 8] Schematic explanatory diagram showing a local heating method for laminated blank glass

[Fig. 9] Explanatory diagram for showing one embodiment of the method of the present invention

FIG. 10: Explanatory diagram for showing one embodiment of the method of the present invention

FIG. 11: Explanatory diagram for showing one embodiment of the method of the present invention

FIG. 12 is a partial schematic explanatory diagram of a portion related to an auxiliary press means of a bending and forming apparatus for laminated blank glass for laminated glass according to an embodiment of the present invention.

[Figure 13] Side view and plan view showing a conventional bending die

[
Figure 14: Conceptual side view showing how the glass plate is formed under its own weight in the present invention

[Explanation of symbols]

17: Glass plate 101, 180, 190, 191: Laminated base glass 1
02: Heating/bending section 2, 110, 142, 181: Bending die 112: Movable split die 111: Fixed split die 130, 160: Auxiliary press means 140: Taper ring 152: Auxiliary press member 170: Heat-resistant cloth

Claims (7)

[Claims] 1. When bending a glass plate into a predetermined curved shape with deeply bent side portions, a fixed split mold having a bending surface corresponding to an intermediate curved portion of the predetermined shape; and a side portion of the predetermined shape. on at least one side of the fixed split mold so that the bending surface has a bending surface corresponding to the bending surface of the fixed split mold, and the bending surface is rotatable around a rotation axis in a direction continuous with the bending surface of the fixed split mold. A placing step of placing a glass plate on a bending die having a movable split die, and heating the glass plate in a heating furnace to a temperature at which the glass plate can be bent. a temporary forming step in which the glass plate is bent under its own weight so as to substantially follow the forming surface of the bending mold; a press forming step in which the lateral deep bending portion of the glass plate to be formed is pressed from above by an auxiliary press member; In the method for bending a glass plate, the bending die is rotated so that the moment of force around the rotation axis applied to the movable split die during press molding is directed in a direction that prevents the bending die from unfolding. A method for bending and forming a glass plate, characterized by positioning the axis. 2. In the method of bending a glass plate according to claim 1, when placing the glass plate on the bending die, force is applied to the movable split die of the bending die to forcibly expand the bending die. A distinctive method of bending and forming glass sheets. 3. When bending a glass plate into a predetermined curved shape with deeply bent side portions, a fixed split mold having a bending surface corresponding to an intermediate curved portion of the predetermined shape; and a side portion of the predetermined shape. on at least one side of the fixed split mold so that the bending surface has a bending surface corresponding to the bending surface of the fixed split mold, and the bending surface is rotatable around a rotation axis in a direction continuous with the bending surface of the fixed split mold. A placing step of placing a glass plate on a bending die having a movable split die, and heating the glass plate in a heating furnace to a temperature at which the glass plate can be bent. A preforming process in which the glass plate is bent by its own weight so as to substantially follow the forming surface of the bending mold, and the lateral deep bending portion of the glass sheet to be formed is pressed from above by an auxiliary press member around a rotation axis applied to the movable split mold. A method for bending and forming a glass plate, comprising the step of press-forming by pressing so that the moment of force is directed in a direction that prevents the bending mold from unfolding. 4. In the method for bending a glass plate according to claim 3, when placing the glass plate on the bending die, force is applied to the movable split die of the bending die to forcibly expand the bending die. A distinctive method of bending and forming glass sheets. 5. An apparatus for bending a glass plate into a predetermined curved shape with deeply bent side portions, comprising: a fixed split mold having a bending surface corresponding to an intermediate curved portion of the predetermined shape; at least one side of the fixed split mold so that the bending surface has a bending surface corresponding to the side part of the fixed split mold, and the bending surface is rotatable about the rotation axis in a direction continuous with the bending surface of the fixed split mold. and a movable split mold provided at the part, and the rotating shaft is such that a moment of force around the rotating shaft applied by a press load by the auxiliary press member prevents the bending mold from unfolding. A bending mold that is placed in a position that applies pressure in the direction of the bending mold, and an auxiliary that can be raised and lowered above the portion of the glass plate placed on the bending mold that corresponds to the deep lateral bending part to be formed. A glass plate bending device comprising: a press member; 6. The glass plate bending apparatus according to claim 5, further comprising means for applying force to the movable split die of the bending die to forcibly expand the bending die. Molding equipment. 7. A bending mold for bending a glass plate into a predetermined shape by placing a glass plate thereon and heating the mold, the fixed split mold having a bending surface corresponding to an intermediate curved part of the predetermined shape. The fixed split mold has a mold and a bending surface corresponding to the side portion of the predetermined shape, and the bending surface is rotatable around a rotation axis in a direction continuous with the bending surface of the fixed split mold. and a movable split mold provided on at least one side of the bending mold, and the rotating shaft is located outside of both sides of the movable split mold when the bending mold is viewed from above. Bending type.