JPH0729793B2 - Bending forming method and apparatus for laminated glass for laminated glass - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bending forming process for a laminated glass sheet for a laminated glass, in which two laminated glass sheets for a laminated glass are bent at the same time and the peripheral edge is strengthened. Related to the method and the device,
In particular, two laminated glass sheets having a relatively small thickness are superposed and the side portions thereof are deep-bent simultaneously, and the peripheral portions of the two laminated glass sheets deep-bent in this way are tempered by air cooling. TECHNICAL FIELD The present invention relates to a method for bending a laminated glass sheet for laminated glass and a device therefor, which are suitable for forming.

[Prior Art] Generally, a laminated glass is formed as a laminated structure in which two laminated glass sheets are bonded to each other with a plastic intermediate film such as a polyvinyl butyral film interposed therebetween.
From the viewpoint of ensuring safety, it has come to be widely used especially as a windshield which is a windshield of an automobile.

By the way, regarding this kind of laminated glass, there is usually a high demand for a glass formed in a curved shape due to a relationship with preferable design requirements such as an automobile body line. It is necessary to bend and form two laminated glass sheets for laminated glass with a desired curvature. In this case, if each laminated glass sheet is formed by bending separately, a slight difference will occur in the curved surface shape of each laminated glass sheet, and it will be successful when laminating with a plastic interlayer film. There is a possibility that inconvenience may occur, such as not bonding, bubbles on the bonding surface, bubbles on the bonding surface of the laminated glass during use, or peeling. Therefore, in order to prevent such inconvenience from occurring in advance, when manufacturing a laminated glass, a method of simultaneously bending and forming two laminated glass sheets has been adopted. .

In this case, as a conventional method for forming a laminated glass sheet for laminated glass for laminated glass, a laminated glass is formed on a bending die having a bending surface corresponding to a desired curved surface of the laminated glass. The two laminated glass sheets are placed on top of each other, and under this condition, the bending mold is carried into the heating furnace, and these laminated glass sheets are heated to the glass softening temperature in this heating furnace. It is known that, along with the softening, the laminated glass sheets are simultaneously bent by gravity along with the bending surface of the bending die (Japanese Patent Publication Sho).
49-10332 publication).

Further, in such a conventional method, when it is necessary to deep-bend the side portion of the laminated glass, a ring-shaped fixed die having a bending surface corresponding to the desired intermediate curved portion of the laminated glass is used. , Having a bending forming surface corresponding to a deep-bent portion of the side of the laminated glass, and a direction in which the bending forming surface is continuous with the bending forming surface of the fixed die by its own weight with respect to both sides or one side of the fixed die A split-type bending die, which is composed of a ring-shaped movable split die that is swingably disposed so as to be directed to, has already been used. According to this, in the state where the movable split mold is unfolded, two flat plate-shaped raw glass sheets are placed on the bending mold in an overlapping manner, and then these raw glass plates are carried into a heating furnace and heated. With the softening, the bending molding surface on the movable split mold side is moved in a direction continuous with the bending molding surface on the fixed mold side, and the side portions of both raw sheet glasses can be deep-bent simultaneously with the movable split mold. It is possible.

[Problems to be Solved by the Invention] Recently, when forming a laminated glass used as a windshield, which is a windshield, from the viewpoint of recent demands for weight reduction of automobiles, safety of passengers in the event of a collision, and the like. , A thin type sheet glass having a plate thickness of about 1.8 to 2.5 mm is often used.

On the other hand, apart from this tendency, the attachment of glass to a window frame of an automobile or the like is called a flush mount method in which a windshield or the like is attached so that the vehicle body surface around the window and the glass surface are at substantially the same level. Many attachment structures have been adopted. Further, with respect to the glass plate applicable to the flush mount system, the required standard in terms of performance quality such as strength is naturally high from the viewpoint of ensuring safety.

By the way, when bending a sheet glass for laminated glass, it is necessary to increase its strength.Therefore, the sheet glass that has been softened by heating and bent should have a compressive stress layer at the periphery of the sheet glass. It is said that it is necessary to cool the peripheral portion at a predetermined cooling rate.

For this reason, the raw glass sheet is placed on a bending mold so that the peripheral edge of the raw glass sheet is slightly projected, and its own weight is bent in a heating furnace.After that, it is introduced into a slow cooling furnace and cooled at a predetermined cooling rate. Therefore, a system for applying a required compressive stress layer to the peripheral edge of the laminated glass sheet is adopted.

However, when the conventional bending method is applied to the thin type sheet glass as described above, the sheet glass should be placed on the bending die forming ring via the peripheral edge portion. Since it will be done in
Even if the raw glass is introduced into the annealing furnace together with the bending die, the peripheral edge of the raw glass cannot be sufficiently cooled because the peripheral edge is still in contact with the molding ring having a high heat capacity. Therefore, there is a problem in that a desired compressive stress cannot be applied to the peripheral edge portion of the raw sheet glass, and a desired peripheral edge strengthening treatment cannot be performed.

Regarding such a problem, by projecting the peripheral edge of the raw sheet glass from the bending-type molding ring, the peripheral edge is bent in a non-contact state with the molding ring and is gradually cooled. Therefore, it is possible to carry out a predetermined peripheral edge strengthening process. However, when it is necessary to deeply bend the side portion of the raw sheet glass, it is necessary to partially press this part separately, and at this time, the peripheral edge portion of the raw sheet glass was projected from the bending ring molding ring, A new problem is encountered in that the desired shape, especially the desired peripheral shape, cannot be obtained.

The present invention has been made by paying attention to such a problem, and an object thereof is to provide a laminated glass sheet for laminated glass capable of simultaneously imparting required strength to the peripheral portions of two laminated glass sheets. To provide a bending forming method and an apparatus therefor.

[Means for Solving the Problem] That is, a method for bending a laminated glass sheet for laminated glass according to the present invention for solving the above-mentioned problems is a bending die for a self-weight bending process having a preset forming surface. The two laminated glass sheets placed on top of each other on top of each other are heated to the bending temperature at the heating / bending processing stage, and the side parts of these laminated glass sheets for deep bending are localized. After being temporarily formed into a shape that is substantially along the forming surface by being heated to a high temperature, and then temporarily formed, the deep-bent portion of these laminated glass sheets placed on the bending die is pressed from above. After press-forming two laminated glass sheets at the same time by pressing using an auxiliary pressing means, the laminated glass sheets are bent by passing through a portion excluding the peripheral portion thereof. It is carried out by pushing up from the mold and separating it, and then cooling it in the slow cooling treatment stage.

Further, at that time, a taper ring having a molding surface formed corresponding to a predetermined molding shape to be applied to the side portion of the laminated glass sheet is formed on the upper surface of the side end portion of the deep bending corresponding portion. It is also possible to use a bending die for self-weight bending that is attached to the edge.

Further, one of the laminated glass sheets may be provided with a print layer of a colored ceramic color frit on at least the deep-bent portion of its side.

On the other hand, regarding the bending die to be used, it is possible to selectively use a split die for self-weight bending and a non-split type second die depending on the stage.

Furthermore, the gradual cooling of the laminated sheet glass that has undergone the press forming is preferably performed by drawing out from the heating / bending processing stage to the gradual cooling processing stage more rapidly than the normal drawing speed. More preferably, the peripheral edge of the laminated sheet glass is partially heated in advance and then pulled out.

On the other hand, the bending forming apparatus for a laminated glass sheet for laminated glass according to the present invention includes a bending surface that corresponds to the intermediate curved portion of the laminated glass sheets that are to be laminated and that is to be molded. A bending die for self-weight bending having a bending forming surface corresponding to the deep bending portion, and above the bending die at a corresponding position of the lateral deep bending portion of the laminated glass sheet to be formed. Auxiliary pressing means arranged and provided with an elevating mechanism capable of pressing the lateral bending portion of the laminated glass sheet on the bending mold, and the laminated glass sheet after deep bending can be pushed upward. In order to do so, it has a push-up means disposed inside the bending die.

The bending die used in this case may be composed of a split type bending die for self-weight bending and a split type second bending die disposed adjacent to the split die. It is also possible to attach a partial heating means that can partially heat the laminated glass sheet that has been press-formed by the pressing means along the peripheral edge portion thereof.

In such a technical means, as for the configuration of the furnace for forming the heating / bending process stage for bending and forming the two laminated glass sheets for laminated glass, at least the laminated glass sheet to be formed is It can be heated up to the softening temperature of the glass, and the design can be appropriately changed as long as it includes that which can deep-bend the side portion of the heat-softened laminated glass sheet by the auxiliary pressing means. It doesn't matter. In this case, from the viewpoint of maintaining good bend formability, the side portion of the laminated glass sheet to be deeply bent is locally heated to a higher temperature than other portions in the heating / bending process stage. It is preferable to do so. For such local heating, it is preferable to dispose local heaters on either the upper side or the lower side of the two laminated glass sheets to be deeply bent, or close to the upper and lower sides.

Further, as for the pushing-up means for pushing up the two laminated glass sheets on the bending die for which the bending process has been completed and pulling them away from the bending die, it is preferable to dispose them in advance in the annealing treatment stage. It may be integrally preliminarily arranged at an appropriate position of the trolley that constitutes the mold conveying means.

Furthermore, regarding the structure of the annealing treatment stage for strengthening the peripheral edges of the two laminated glass sheets that have been subjected to bending processing, at least the peripheral edge portions of the laminated glass sheets are cooled so that a desired compressive stress layer can be formed. If it is possible, the design may be changed appropriately. In this case, it is preferable to provide a rapid drawing means capable of rapidly drawing the laminated glass sheet together with the bending die from the heating / bending processing stage to the slow cooling processing stage.

[Operation] According to the technical means as described above, the two laminated glass sheets for laminated glass placed on the bending die are used in the heating / bending stage in the furnace for heating / bending. In the former stage, after being heated to the glass softening temperature and temporarily formed into a shape that is substantially along the bending mold, the incompletely formed parts of these two temporarily formed laminated glass sheets, specifically, the laminated glass sheet The deep-bending portion is partially press-formed along the deep-bending corresponding portion of the bending die after the heating / bending stage in the furnace. In this way, the two laminated glass sheets after the bending process are completed are separated from the bending die by the push-up means, and are placed in the annealing stage under the condition that they are stacked. Thus, the compressive stress layer can be effectively formed especially on the peripheral portion thereof. By doing so, for example, a peripheral compressive stress of 150 to 600 kg / cm ² which is practically necessary for improving the strength of the peripheral edge of the laminated glass can be obtained.

[Examples] Hereinafter, a method for bending and strengthening a laminated glass sheet for laminated glass and an apparatus therefor according to the present invention will be described in detail with reference to Examples shown in the accompanying drawings.

FIG. 1 is an explanatory view showing an outline as an example in the case where the present invention is applied to a bending forming strengthening processing system for laminated glass for laminated glass, which deep-bends both sides of laminated glass for laminated glass. is there.

That is, the two laminated glass sheets 1 for laminated glass are
Conveying means 4 having an appropriate configuration, such as a chain conveyor 6 and a supporting column 7 for supporting the same, which are stacked and placed on a bending die 10 for self-weight bending that is placed on a carriage 5.
Then, it is carried into the furnace 2 and undergoes a heating / bending process as a temporary forming process and a heating / bending process stage ST ₁ for press-forming the deep-bent portion, whereby the required bending process is sequentially performed. After being subjected to such bending, the two laminated glass sheets 1 for laminated glass are transferred to the conveying means 4
It is conveyed to the partial heating stage ST ₂ to be held next to the bending die 10 through the via, and the peripheral edge portion of the laminated glass sheet 1 after bending is subjected to partial heating treatment. Then, after being carried into the slow cooling treatment stage ST ₃ and subjected to the necessary peripheral edge strengthening processing, this slow cooling treatment stage ST ₃
It is carried out from the furnace to the outside of the furnace 2 and allowed to cool.

In this case, in the previous stage of the heating / bending stage ST ₁ , the laminated glass sheet 1 is heated and softened to a glass softening temperature (for example, 550 to 650 ° C.) by the heater 3 arranged in the furnace 2. As a result, it is possible to perform temporary molding that is substantially along the molding surface of the bending die 10.

In the subsequent stage of the heating / bending process stage ST ₁ , the auxiliary press means 20 partially press-forms the incompletely formed portion of the deep-bent portion of the laminated glass sheet 1.

Thus, after the bending process for the laminated glazing 1 is completed, the laminated glazing 1 is transported to the next partial heating stage ST ₂ and brought close by the partial heating means 30.
The peripheral portion of the is partially heated. This partial heating is for increasing the cooling start temperature at the time of strengthening processing of the peripheral edge portion of the laminated glass sheet 1. Thereby, the temperature gradient of cooling can be taken and a larger compressive stress layer at the peripheral edge can be formed.

On the other hand, in the next stage of slow cooling treatment ST ₃ , the laminated glass sheet 1 that has been press-molded and has undergone the partial heating in the partial heating stage ST ₂ has a compressive stress formed in its peripheral portion. Laminated glass sheet 1 with push-up means 40 has been subjected to the required peripheral edge strengthening process, and in order to prevent undesired distortion from entering the plane of the two laminated glass sheet 1.
While being pushed up on the bending die 10 via a portion excluding its peripheral portion, it is gradually cooled while moving at a cooling rate that is preset and controlled, or while stopped for a predetermined time.

After that, by carrying out from the annealing stage ST ₃ to the outside of the furnace 2, the two laminated glass sheets 1 having been formed and processed
Is allowed to cool.

As a bending die 10 for placing the two laminated glass sheets 1 on each other for gravity bending, the forming temperature of the glass sheets in the furnace 2 (580 to 7
Of a heat-resistant material that can withstand a temperature of (00 ° C) and has a bending surface corresponding to the intermediate curved portion of the laminated glass sheet 1 and a lateral bending surface corresponding to the lateral deep bending portion of the forming target. What can be used preferably. Such bending mold 10
As the configuration of the above, a ring-shaped one capable of supporting the peripheral edge portion of the laminated glass sheet 1 is used. Further, as the bending die 10 for self-weight lifting processing of this kind, in addition to a fixed type die having a desired forming surface, that is, a split type die, it is divided into a fixed die and a movable split die. Any type of split type configured as described above may be used.

The bending die 10 for dead-weight bending illustrated in FIG. 2 is of a split die type, is placed on a carriage 5 that constitutes the conveying means 4, and is deep-bent formed laminated glass sheet. 1
Of the ring-shaped fixed die 11 having a bending forming surface 12 corresponding to the central curved portion excluding both side portions of the fixed die 11, and swingably provided on both sides of the fixed die 11 to correspond to the deep bent portion of the laminated glass sheet 1. It has a bending molding surface 14, and this bending molding surface 14 is constituted by a ring-shaped movable split mold 13 which is continuous with the bending molding surface 12 of the fixed mold 11 during deep bending. The fixed mold 11 is fixed on the trolley 5 through the pillars 15, while the movable split mold is used.
Both side portions in the width direction of 13 are pivotally fixed to the tip end portions of columns 17 standing on a fixed bracket 16 on the carriage 5. Further, a balance weight 19 is attached to the support portion of the movable split mold 13 via a moment arm 18 so that the movable split mold 13 is biased toward the position where it is connected to the fixed mold 11 during deep bending. ..

Note that FIG. 2 shows a state before heating, in which the flat laminated glass sheet 1 is placed on the bending die 10 for self-weight bending having the above-described structure, and FIG. 3 shows the laminated glass sheet 1 FIG. 3 shows the state after the bending process is finished.

Further, FIG. 4 shows the pushing-up means after the bending process is completed.
FIG. 5 shows a state in which the laminated glass sheet 1 is pushed up and pulled away from the bending die 10 through 40, and FIG. 5 shows a split state of the bending die 10 in such a case,
FIG. 6 is a schematic plan view showing a mutual positional relationship with a supporting frame portion 41 that constitutes the pushing-up means 40.

As for the movable split mold 13, if the weight of the laminated glass sheet 1 is directed toward the fixed mold 11 and the movable split mold 13 is stopped in the positional relationship linked to the fixed mold 11, its specific structure is appropriately changed in design. However, regarding the response return force at that time, the constituent members of the movable split mold 13 itself and the balance weight
It can be adjusted by the weight of 19.

It should be noted that the movable split mold 13 corresponding to the lateral deep bending portion of the laminated glazing 1 of the bending mold 10 or the outside of the side edge of the laminated glazing of the fixed mold when the bending mold is a non-breaking type. It is preferable to attach a taper ring 20 projecting from the end of the bending die 10 to the end as shown in FIG. 2. In some cases, the taper ring 20 is replaced with the peripheral edge of the bending die 10 itself. A structure may be provided in which a protrusion (not shown) that is protruded from is provided. The contact surface of the protruding portion (not shown) provided on the periphery of the taper ring 20 or the bending die with the lower surface of the end portion of the laminated glass sheet 1 has a molding surface 21 matched with a desired design shape of the laminated glass. It is formed so as to be able to support the end portion of the laminated glass sheet 1 in a desired shape during press molding. Therefore, at the time of temporary forming of the two laminated glass sheets 1 by self-weight bending on the bending die 10, only the ends of the laminated glass sheet 1 contact the taper ring 20 or the supporting surface of the protruding portion, and Since it can be supported in a state where there is a gap between the lower surface and the taper ring 20 or the molding surface 21 of the projecting portion, it has been apt to come into contact with the molding surface of the bending die 10 in the past during the temporary molding. It is possible to effectively prevent the generation of a mold mark from the end portion of the contact lower surface of the laminated glass sheet 1 toward the inner side.

Thus, by pressing the peripheral portion of the laminated sheet glass 1 by the auxiliary pressing means 30, a desired shape that matches the forming surface 21 of the taper ring 20 and the bending forming surface 14 located at the end of the bending die 10 is formed. Can be given. The taper ring 20 provided in order to obtain such an operation effect or the above-mentioned protrusion provided on the periphery of the bending die, which is not shown, may be provided at least in a portion corresponding to the deep bending necessary for the bending die 10. It does not necessarily have to be provided on the entire side of the bending die 10.

Further, when press-forming the deep-bent portion of the laminated glass sheet 1 by the auxiliary pressing means 30 after the heating / bending process stage ST ₁ , the bending die provided with the fixed die 11 and the movable split die 13 as described above. After temporarily shaping by self-weight bending with 10, the bending die 10 is changed to a fixed type (not shown) having a ring-shaped die having a bending surface corresponding to the deep bending part of the laminated glass sheet 1, that is, a split type bending die. If it is carried out after the transfer, it is possible to prevent the movable split mold 13 from jumping up and the local deformation of the laminated glass sheet 1 observed during press molding with respect to the bending mold 10 having the fixed mold 11 and the movable split mold 13. It can be press molded.

When the deep bending portion of the laminated glass sheet 1 is press-formed by the auxiliary pressing means 30 using the split-type bending die 10, the jumping of the movable split die 13 at the deep bending portion during press forming is prevented. It is preferable to attach an appropriate jumping stopper that can be used.

Further, as shown in FIG. 1, the auxiliary pressing means 30 is placed at a desired position above a portion corresponding to the deeply bent portion of the laminated glass sheet 1 placed on the bending die 10 after the provisional forming. It has an arranged auxiliary press member 31, and this auxiliary press member 31 is attached to a press base 32 via a support arm 33. The press base 32 is arranged so as to be able to move up and down in response to the advance / retreat of the press cylinder 34, and when the press base 32 descends, the deep-bent portion of the laminated glass sheet 1 is press-formed by the auxiliary press member 31. By raising this, the pressing action of the auxiliary pressing member 31 on the deeply bent portion of the laminated glass sheet 1 can be released.

Further, when pressing the deep-bent portion of the laminated glass sheet 1 by the auxiliary pressing means 30, in order to reduce the generation of wrinkles, scratches and press marks on the laminated glass sheet 1 due to the press, It is more preferable to perform the pressing by the auxiliary pressing member 31 so that the contact portion is in the normal direction.

In addition, in order to prevent press marks from being generated at the time of press-molding the laminated glass sheet 1, at least a contact surface of the auxiliary pressing member 31 with the laminated glass sheet 1, glass fiber, silica fiber, other ceramic fiber, It is preferable to cover the heat resistant cloth made of metal fiber or the like.

Furthermore, when two laminated laminated glass sheets 1 are placed on a split-type bending die 10, and when these laminated glass sheets 1 are bent by self-weight bending, bending of the deep-bent portion is performed. In order to make processing easier,
It is desirable to provide a local heater (not shown) above and / or below the laminated glass sheet 1 at the portion corresponding to the deeply bent portion. In this case, the deep bending portion of the laminated glass sheet 1 is made higher in temperature than other portions, for example, about 10 ° C. to 100 ° C., so that the bending work by the weight of the deep bending portion can be facilitated.

Further, the shape of the local heating heater is appropriately determined according to the specific shape of the deep-bent portion to be bent if desired, and in addition to being linear in the length direction, deep-bending It may be formed in a curved shape such that the polygonal line in the portion is curved, or may be formed in a more complicated shape.

In the method of the present invention, a laminated glass sheet 1 including a portion which is deeply bent by press forming using the auxiliary pressing means 30
A colored band may be formed in advance on the periphery of the printed layer by using a printed layer made of a colored ceramic color frit. In this way, if a printed layer of colored ceramic color frit is formed on the press-molded portion and is baked on the surface of the laminated glass sheet 1 in the heating step before press-molding, even if the colored ceramic color frit is baked during pressing. Even if a press mark or a press scratch is generated in the colored band or the peripheral portion of the laminated glass sheet 1, this baked color band can make the press mark or the press scratch inconspicuous and can conceal the optical defect in appearance. it can.

In addition, of the two laminated glass sheets 1 laminated,
When a printed layer of colored ceramic color frit is formed on the upper surface of the deep-bent portion of the laminated glass sheet 1 located on the upper side, the printed layer adheres to the heat resistant cloth covered by the auxiliary press member 31 and The life may be shortened, or a press mark may be generated on the surface of the baked colored band of the colored ceramic color frit. In order to prevent this, if a heat-resistant release agent is printed on the printed layer of colored ceramic color frit to form the release agent layer in advance, if the colored ceramic color frit is baked and the auxiliary band is used during press molding. It is possible to improve the releasability between the press member 31 and the heat resistant cloth. As such a heat-resistant release agent, boron nitride, carbon or the like can be preferably used.

Further, if it is intended to improve the service life of the heat-resistant cloth covered with the auxiliary pressing member 31 and to improve the pressing surface of the baked colored band of the colored ceramic color frit as described above, the two laminated laminated glass sheets 1 After preforming by self-bending, prior to press forming by the auxiliary press member 31, first, the laminated glass sheet 1 is exchanged upside down, and the laminated glass sheet 1 on the side having the baked colored band of the colored ceramic color frit is placed on the lower side. Then, by pressing the peripheral portion of the other laminated glass sheet 1 located on the upper side, the colored ceramic color ink can be prevented from adhering to the heat resistant cloth and the pressing surface can be improved.

On the other hand, in the furnace 2, the heating / bending stage ST
_If necessary, a partial heating stage ST ₂ can be arranged in the stage next to ₁ , and the partial heating stage ST ₂ is a part for partially heating the peripheral edge of the laminated glass sheet 1 that has already been bent. A heating means 35 is provided. Figure 8 shows
Partial heating means 3 of the partial heating stage ST ₂ in this case
Fig. 5 shows a specific example of the arrangement state of No. 5, and has a heater portion 36 formed in a ring shape so as to correspond to the shape of the peripheral edge portion of the laminated glass sheet 1 after bending. The portion 36 is formed such that it can be brought into and out of contact with the laminated glass sheet 1 by way of a supporting arm portion 37 that is arranged to be movable up and down like the auxiliary pressing means 30 in FIG. . Therefore, the peripheral portion of the laminated glass sheet 1 is desired by bringing the heater portion 36 close to the laminated glass sheet 1 after bending, which is carried in through the conveying means 4 and stopped at a predetermined position. Partial heating can be performed up to the reached temperature.

Thus, the laminated glass sheet 1 that has undergone the necessary processing such as bending is bent by the transfer means 4 described above.
It is possible to effectively cool the peripheral edge portion of the laminated glass sheet 1 that has been carried into the slow cooling stage ST ₃ together with 10 and pulled away from the bending die 10 by way of an appropriate push-up means 40. it can.

As for the push-up means 40 used in this case, as shown in FIG. 1, the push-up means 40 is arranged so as to be able to project and retract through the opening 9 provided in the hearth 8 in the slow cooling treatment stage ST ₃ . Although preferable, it can be integrally arranged on the carriage 5 itself which is conveyed through the conveying means 4 if necessary.

FIG. 4 shows an example of a specific structure in the case where the thrusting means 40 is provided through the opening 9 provided in the hearth 8 in the slow cooling treatment stage ST ₃ .

According to this, the pushing-up means 40 is a split type bending die 10 shown in FIG. 5, and, if necessary, when the laminated glass sheet 1 is transferred to a split type bending die, the bending after transfer is performed. A ring-shaped support frame portion 41 formed so as to be arranged so as to be adjacent to the inner peripheral sides of the surrounding frame-shaped bend forming surfaces 12 and 14 of the mold, and stretched on the support frame portion 42. The support member 42 and a supporting rod 43 that holds the support member 42 at an appropriate position and can be moved up and down by an appropriate elevating mechanism (not shown) such as a cylinder mechanism. In addition, when the supporting frame portion 41 is mounted on the supporting frame portion 41 by interposing an appropriate portion other than the peripheral portion of the laminated glass sheet 1,
In order not to leave scratch marks on the contacted support surface,
It is desirable to previously cover a heat-resistant cloth 44 made of asbestos cloth, glass fiber cloth, and various other heat-resistant fibers at appropriate intervals. FIG. 6 is an enlarged view of a main part thereof, and FIG. It is a figure which shows the sectional view on the AA line in a figure.

Further, the laminated glass sheet 1 that has undergone the required bending process is heated from the heating / bending process stage ST ₁ to the partial heating stage S.
When it has T ₂ , it is carried in from this partial heating stage ST ₂ to the slow cooling treatment stage ST ₃ and cooled, but at that time, the carrying speed to the slow cooling treatment stage ST ₃ is Although it can be performed at a speed, more preferably, the laminated glass sheet 1 is rapidly drawn out from the heating / bending processing stage ST ₁ or the partial heating stage ST ₂ at a speed higher than the normal speed, and then to the slow cooling processing stage ST ₃ . It is desirable to increase the temperature gradient of cooling by drawing in.

FIG. 9 shows an example of the structure for performing such rapid withdrawal. In the hearth 8, a transfer means 4 such as a normal transfer chain conveyor for transferring at a normal speed.
In addition to the above, a rapid transfer rail 45 capable of projecting and retracting from the hearth 8 is separately arranged in advance, and the carriage 5 is mounted on the rapid transfer rail 45 and an appropriate rapid drive mechanism is provided.
It is carried out by drawing into the slow cooling stage ST ₃ via 46 at a speed faster than usual. Alternatively, rapid withdrawal is performed by transferring from a chain conveyor having a slow transfer speed or a roll conveyor to a chain conveyor having a high transfer speed or a roll conveyor.

By thus, for combined glass material 1 in which the top side 1a portion are arranged in a positional relationship that precedes the lower side 1b, under normal speed annealing processing stage ST ₃ are relatively delayed the lower side 1b Even if cooling may be delayed due to being carried in, if rapid transport is performed in this way, there will be no time difference in cooling not only on the upper side 1a on the downstream side in the transport direction but also on the lower side 1b on the upstream side. Therefore, the compressive stress applied to the lower side 1b can be increased as compared with the conventional case.

It should be noted that 0.1 to 0.2 m / sec is generally used for normal transport conditions, but 0.7 to 1.5 m / sec is used for rapid transport conditions.
Is preferred.

Table 1 shows a comparison between the stress obtained under the rapid transport condition according to the present invention and the stress obtained under the normal transport condition.

In the above table, E / C represents the average compressive stress value in the peripheral portion of the laminated sheet glass, and I / T represents the average tensile stress layer in the inner portion of the region where the compressive stress layer is formed.

According to the above table, the slow cooling treatment stage under the rapid transportation condition.
By pulling the laminated glass sheet 1 into ST ₃ ,
There is no big difference in the compressive stress applied to the upper side 1a and the lower side 1b, and the numerical value can be larger than that in the normal transport condition, and the tensile stress is at the same level, so It turns out that an excellent edge strengthening treatment of laminated glass sheets can be performed.

On the other hand, in the case of partially heating the peripheral portion of the laminated glass sheet 1 after being bent by the partial heating means 35 shown in FIG. 8, the higher the ultimate temperature, the larger the compressive stress applied to the peripheral portion. Although it should be possible to give it, it is accompanied by adverse effects such as deformation of the glass and excessive tensile stress on the inside.Therefore, the temperature reached must be subject to practical restrictions. Absent. Therefore, the heating temperature for the laminated glass sheet 1 can be adjusted in an appropriate range by controlling the distance between the heater and the heater unit 36 for partial heating and the output.

Table 2 shows an example in which the case of slow cooling after performing such partial heating is compared with the case of slow cooling without performing such partial heating.

As is clear from the above table, in the case of gradually cooling after partial heating, a large compressive stress is applied to the peripheral edge of the laminated glass sheet 1 as compared with the case of slow cooling without partial heating. Can be granted.

It should be noted that more preferable results can be obtained if the partial heat treatment and the rapid conveyance are performed together.

[Effects of the Invention] As described above, according to the method for bending a laminated glass and the apparatus therefor according to the present invention, the glass plate for laminated glass is heated to the glass effect temperature and bent by the self-weight bending method. After temporary forming into a shape that is substantially in line with the above, since the completely formed part of the laminated glass sheet is corrected by partial pressing, even if the degree of deep bending of the side portion of the laminated glass sheet is large, the laminated glass The side part of the laminated glass can be surely deep-bent formed, the degree of freedom of the forming shape of the laminated glass sheet can be increased, and moreover, the peripheral edge portion of the laminated glass sheet is in an open edge state and is effectively cooled slowly. The peripheral edge can be strengthened.

Further, in one embodiment of the present invention, the end portions on both sides of the two laminated glass sheets stacked and placed on the bending die are further received by a taper ring provided adjacent to the outside of the bending die. If so, the deep-bent portion of these laminated glass sheets is locally heated to a temperature higher than other portions by a local heating heater, self-weight-bently formed, and further, this locally heated portion is pressed from above by auxiliary pressing means. As a result, the side edge portions of these laminated sheet glass can be bent and formed with a desired radius of curvature. For example, in the case where press forming is not performed after the self-weight bending, it is almost the limit to bend and form the side edge portions of two laminated glass sheets with a radius of curvature of 600 to 10000 mmR. By press forming the edges, it became possible to perform bending with a radius of curvature of about 80 to 200 mmR. Further, in order to support the side end portions of the two laminated glass sheets with the taper ring at the time of pressing, when the two laminated glass sheets are projected from the end of the bending die by about 4 mm to 10 mm as in the conventional case. In addition, it is possible to eliminate the trace of the bending die generated at the contact portion of the lower end of the laminated glass sheet with the molding surface of the ring of the bending die.

Further, when deep-bending a laminated glass sheet for laminated glass having a desired curvature, there has been a problem that a complicated step called an oversize processing method has conventionally been required, but according to the present invention. For example, by using a laminated glass sheet that has been previously cut to a size that matches the shape of the laminated glass to be obtained, it is possible to obtain a deep-bending laminated glass having a desired peripheral edge curvature,
The production of laminated glass having such a shape can be facilitated and the cost can be reduced.

Furthermore, in another aspect of the present invention, when a printed layer made of a colored ceramic color frit is provided in the deep-bent portion of the laminated sheet glass that is press-formed by the auxiliary pressing means, the laminated sheet glass is pressed by the auxiliary pressing member. Even if a press mark is attached to the surface or the surface of the colored ceramic color frit that has been baked, the colored ceramic band of the colored ceramic color frit makes it inconspicuous.

On the other hand, in the gradual cooling stage, it is possible to cool the laminated glass sheet by removing it from the bending die while supporting the portion of the laminated glass sheet except for the peripheral edge portion through the push-up means. Even in the case of a laminated glass sheet having a two-layered thickness, the required peripheral edge strengthening treatment can be effectively applied to the peripheral edge portions at the same time. in this case,
When the peripheral portion of the laminated sheet glass is partially heated in advance, a larger compressive stress can be applied.

In addition, when carrying in the slow cooling stage under rapid transfer conditions, greater compressive stress can be applied to not only the upper side but also the lower side as compared with the conventional case, and the strength of the peripheral portion is increased. It can be more preferable.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a bending and shaping system for laminated glazings incorporating an embodiment of a bending and shaping apparatus for laminated glazings for laminated glass according to the present invention, and FIGS. FIG. 4 is an explanatory view showing a bending process of a laminated glazing for laminated glass according to an embodiment of the present invention using a bending die of the present invention, and FIG. 4 is a schematic plane view showing a push-up state of a raw glass by push-up means. 5 and 5 are schematic plan views showing the positional relationship between the split type bending die and the push-up means, and FIG. 6 is an enlarged view of a main part showing the state of the support frame portion in the push-up means of FIG. , FIG. 7 is a sectional view taken along line AA in FIG.
FIG. 8 is a schematic explanatory view showing an example of the partial heating means, and FIG. 9 is a schematic explanatory view showing an example of the rapid drawing means. 1 ... Laminated glass sheet, 2 ... Furnace 4 ... Conveying means, 5 ... Truck 8 ... Hearth, 9 ... Opening 10 ... Bending type, 11 ... Fixed type 13 ... Movable split type, 20 …… Tapering ring 30 …… Auxiliary pressing means, 31 …… Auxiliary pressing member 35 …… Partial heating means, 36 …… Heater part 40 …… Pushing up means, 41 …… Support frame part 42 …… Supporting member, 43 …… Support rod 41 …… Heat resistant cloth, 45 …… Rapid transport rail 46 …… Rapid drive mechanism

Claims (10)

[Claims] 1. A pair of laminated glass sheets, which are stacked and placed on a bending die for gravity bending having a preset forming surface, are heated to a bending temperature at a heating / bending processing stage. In addition, after temporarily forming the side portions for deep bending in these laminated glass sheets by locally heating them to a higher temperature to temporarily bend the side portions to a shape substantially along the forming surface, and then immediately bending the After press-forming two laminated glass sheets at the same time by pressing the deep-bent portion of these laminated glass sheets placed in the mold from above using auxiliary pressing means, these laminated glass sheets are Bending formation of a laminated glass sheet for laminated glass characterized in that it is pushed up and separated from the bending die through a portion excluding the peripheral edge portion, and is cooled in a slow cooling treatment stage. Processing method. 2. A taper ring having, on its upper surface, a molding surface formed corresponding to a predetermined molding shape to be applied to the side portion of a laminated glass sheet, is attached to a side end edge of the deep bending corresponding portion. Place two laminated glass sheets on a bending die for self-weight bending, and heat up to the bending temperature on the heating / bending processing stage, and perform deep bending on these laminated glass sheets. By temporarily heating the side part for locally heating to a higher temperature to perform temporary molding by self-bending in a shape substantially along the molding surface, immediately afterwards, these component pieces placed on the bending die. After press-molding two laminated glass sheets at the same time by pressing the deep-bent portion of the glass sheet from above using an auxiliary pressing means, these laminated glass sheets should be intervened through a part excluding their peripheral edge portions. Distancing push up from the bending tool, and bending processing method of the laminated glass for combined glass material, characterized in that cooling by slow cooling process stages. 3. When simultaneously bending and forming the side parts of two laminated laminated glass sheets to deeply bend, at least one of these laminated glass plates is colored in at least the deep-bent portion of the side parts. A laminated glass sheet provided with a printed layer of ceramic color frit is used, and this laminated glass sheet is placed on the upper side of the laminated glass sheet, and the other glass sheet is laminated on the other laminated glass sheet. It is placed on a bending mold for its own weight bending process and heated to the bending temperature at the heating / bending process stage, and the side parts of these laminated glass sheets for deep bending are locally By heating to a high temperature, it is bent by its own weight to a shape that is substantially along the molding surface and temporarily molded, and the print layer is baked on the glass plate surface. Immediately after that, the printed layer portion after baking which is located in the deeply bent portion of the laminated glass sheets placed on the upper side of the laminated glass sheets placed on the bending die is pressed from above the auxiliary press means. After press-forming two laminated glass sheets at the same time by pressing using, the laminated glass sheets are pushed up and separated from the bending die through a portion excluding the peripheral portion thereof, and a slow cooling treatment stage A method of bending and forming a laminated glass sheet for laminated glass, which is characterized in that the glass is cooled by. 4. When simultaneously bending and forming the side portions of two laminated laminated glass sheets so as to deeply bend the laminated glass sheets, at least one of the laminated glass sheets is colored in at least the deep-bent portion of the side portion. A laminated glass sheet provided with a printed layer of ceramic color frit is used, and this laminated glass sheet is placed on the upper side of the laminated glass sheet, and the other glass sheet is laminated on the other laminated glass sheet. It is placed on a bending mold for its own weight bending process and heated to the bending temperature at the heating / bending process stage, and the side parts of these laminated glass sheets for deep bending are locally By heating to a high temperature, it is bent by its own weight to a shape that is substantially along the molding surface and temporarily molded, and the print layer is baked on the glass plate surface. After that, these laminated glass sheets placed on the bending die are overlaid by switching them so that the baking print layer is located on the overlay surface, and immediately placed on the bending die. After press-forming two laminated glass sheets at the same time by pressing the deep-bent portion of the laminated glass sheet from above using an auxiliary pressing means, insert these laminated glass sheets through a portion excluding the peripheral portion thereof. 2. A method for bending and forming a laminated glass sheet for laminated glass, which comprises pushing up and separating from the bending mold and cooling at a slow cooling stage. 5. A pair of laminated glass sheets stacked and placed on a bending die for self-weight bending of a split die capable of forming a preset forming surface with a movable split die and a fixed die. Was heated to the bending temperature in the heating / bending stage, and the side portions for deep bending in these laminated glass sheets were locally heated to a higher temperature so that they were substantially along the forming surface. After being bent by its own weight into a shape and temporarily formed, these laminated glass sheets are transferred from the split die type bend die to the split die type second bend die, and immediately thereafter, placed on the second bend die. After pressing the deep-bent portion of these placed laminated glass sheets from above by using an auxiliary pressing means, two laminated glass sheets are press-formed at the same time, and then these laminated glass sheets have their peripheral edges. Distancing push up from the bending tool by through site excluding and bending processing method of the laminated glass for combined glass material, characterized in that cooling by slow cooling process stages. 6. The gradual cooling of the laminated glass sheet that has been press-formed by the auxiliary pressing means is carried out to a gradual cooling treatment stage in a state where the laminated glass sheet that has gone through a heating / bending processing stage is pushed up from a bending die. 6. The method of claim 1, 2, 3, 4, or 5 wherein the process is performed by rapidly drawing in.
A method for bending a laminated glass sheet for laminated glass according to the description. 7. The gradual cooling of the laminated glass sheet that has been press-molded by the auxiliary pressing means is such that the peripheral edge portion of the laminated glass sheet is partially heated by the partial heat treatment stage and then rapidly drawn into the gradual cooling treatment stage. The method of bending a laminated glass sheet for laminated glass according to claim 6, wherein 8. A bending forming surface corresponding to an intermediate curved portion of a forming target of two laminated glass sheets to be placed in an overlapping manner,
A bending die for self-weight bending having a bending forming surface corresponding to the lateral deep bending portion to be formed, and a lateral deep bending portion to be formed of the laminated sheet glass above the bending die. Auxiliary pressing means provided at corresponding positions and provided with an elevating mechanism capable of pressing the lateral deep bending portion of the laminated glass sheet on the bending mold, and the laminated glass sheet after deep bending are projected upward. A bending apparatus for laminated glass for laminated glass, comprising a push-up means disposed inside the bending die so as to be able to raise the glass. 9. A bending forming surface corresponding to an intermediate curved portion of a forming target of two laminated glass sheets to be stacked and placed,
A split die type bending die for self-weight bending, which has a bending forming surface corresponding to a lateral deep bending portion to be formed, and a bending die for adjoining the bending die, and being placed. A second bending die of a split type having a preset bending forming surface for laminated glass, and a lateral depth above the second bending die which is a forming object of the laminated glass. Auxiliary pressing means having an elevating mechanism arranged at a corresponding position of the bending portion and capable of pressing the lateral deep bending portion of the laminated raw sheet glass on the bending mold, and the laminated raw sheet glass after deep bending shaping A device for bending and forming a laminated glass sheet for laminated glass, comprising: a push-up means disposed inside the second bending die so as to be able to push up upward. 10. A partial heating means for partially heating the laminated glass sheet after deep bending by the auxiliary pressing means is provided along the peripheral edge portion thereof. 9. A device for bending a laminated glass sheet for laminated glass according to item 9.