JP3598538B2 - Method and apparatus for quenching and strengthening glass plate - Google Patents

Description

[0001]
[Industrial applications]
The present invention is, automobiles, ships, railways, on strengthening method and apparatus for a glass plate for a tempered glass production of transportation equipment or other various uses for architectural, such as an aircraft.
[0002]
[Prior art]
In forming bent by the forming mold a glass plate heated to near the softening point in a heating furnace, (hereinafter referred to simply press ring) press the support ring it is known to support the periphery of the glass plate by. In this method, a peripheral edge of a glass plate is pressed by a press ring toward an upper die having a downward convex shape, and the glass plate is bent into an upper die shape. Thus, the bending accuracy of the peripheral portion of the glass plate can be increased. It is also known that a glass sheet formed by bending while being supported by the press ring is transported into a cooling device while being held by the same press ring to rapidly cool and strengthen the glass sheet.
[0003]
However, when the lower surface of the peripheral portion of the glass plate supported by the press ring during quenching reinforced, that also cooling Eagako between the glass plate and the press ring. Therefore, cooling of the lower surface of the peripheral portion of the glass plate is delayed harmful tensile stress to the glass plate strength occurs. In order to prevent such a problem, a press ring is not formed in a continuous structure but in a discontinuous structure such as a comb- like shape. For this reason, the cooling air between the press ring and the glass plate can be easily removed. However, since the press ring is discontinuous, the imprint of the press ring is transferred to the glass plate at the time of molding, and a mold mark distortion is generated.
[0004]
On the other hand, in the specification of US Pat. No. 4,661,141, a glass plate is pressed against a forming die with a press ring made of a continuous body, and the formed glass sheet is cooled with a cooling support ring made of a discontinuous body (hereinafter simply referred to as a cooling ring). fall, transferred onto a say), while supporting the peripheral portion of the lower surface glass plate cooling ring, transported into the cooling apparatus, apparatus for enhancing quenching have been proposed.
[0005]
However, in this apparatus, a glass plate having a temperature of approximately 640 ° C. or higher is dropped on the cooling ring to support the peripheral portion. There has been a problem that the traces of the irregularities are transferred to the lower surface of the glass plate to cause mold trace distortion. Further, when the glass plate is transported into the cooling device, the glass plate deforms due to its own weight, and the glass plate slips on the contact surface between the glass plate and the cooling ring. Therefore, due to the discontinuous structure of the cooling ring, the glass plate is scratched, and there is a problem in quality, or a problem of causing breakage of the glass plate during quenching and strengthening. there were.
[0006]
In order to solve such a problem, Japanese Patent Application Laid-Open No. 57-145041 and Japanese Utility Model Application Laid-Open No. Sho 62-157939 propose devices for performing from molding to cooling with a support ring having a dual structure of a press ring and a cooling ring. ing. The apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 57-145041 has a configuration in which a continuous press ring is disposed at a peripheral portion of a lower surface of a glass plate, and a discontinuous cooling ring is disposed inside the press ring. At the time of molding, the peripheral edge of the lower surface of the glass plate is supported by a press ring, and in this state, the glass is pressed against a mold and molded. The glass sheet that has been formed is transported into the cooling device with its lower peripheral edge being supported by the press ring.
[0007]
When transported into the cooling device, the cooling ring disposed on the inner peripheral side of the press ring supporting the glass plate is projected, and the inner peripheral side of the lower peripheral edge of the glass plate is supported by the cooling ring. In this state, the glass plate is quenched and strengthened. However, in this cooling method, cooling is performed while supporting the inner peripheral side of the peripheral edge of the lower surface of the glass plate with a discontinuous comb- shaped cooling ring, so that the cooling ring is transferred to the inner peripheral side of the peripheral edge of the lower surface of the glass plate. stiff is caused a problem that the type mark distorted by the mark occurs. In addition, since cooling is performed while supporting the inner peripheral side of the lower peripheral edge of the glass plate with a support ring during quenching, there is no support medium at the peripheral edge of the glass plate, and the accuracy of the shape of the peripheral edge of the glass plate deteriorates. However, there is a problem that the variation in the shape becomes large.
[0008]
On the other hand, the apparatus disclosed in Japanese Utility Model Application Laid-Open No. Sho 62-157939 has a structure in which a discontinuous cooling ring is arranged on the periphery of the lower surface of a glass plate, and a continuous press ring is arranged inside the cooling ring. At the time of molding, the glass plate is pressed against a mold while the inner peripheral side of the lower peripheral edge portion of the glass plate is supported by a press ring to perform molding. After molding, the glass sheet is transferred to the cooling device as it is, and in the cooling device, the glass plate supporting the inner peripheral side of the lower peripheral edge by the press ring is supported by the cooling ring to support the lower peripheral edge of the glass plate. Reinforce quenching.
[0009]
However, in this method, since the glass plate is pressed against the forming die while supporting the inner peripheral side of the lower peripheral portion of the glass plate with the press ring at the time of forming, the peripheral portion of the glass plate does not sufficiently adhere to the forming die, There is a problem that the shape of the molding die is not transferred and the molding accuracy of the peripheral portion of the glass plate is deteriorated. In addition, there is also a problem in that mold trace distortion due to the transfer trace of the press ring is generated on the inner peripheral side of the lower peripheral edge of the glass plate.
[0010]
[Problems to be solved by the invention]
As described above, in any of the above-described methods, the molding and cooling steps are performed while the lower surface of the glass plate is supported by the support ring for pressing and cooling, so that the mold trace distortion due to the transfer trace of the support ring , and the glass flaws due to sliding during plate deformation, but occurs on the glass plate lower surface (i.e. vehicle exterior side). Particularly, in the case of a tempered glass sheet for an automobile, if there is a mold distortion of the support ring in a portion that cannot be concealed by a molding or the like, a quality defect occurs. Moreover, in recent tempered glass sheets for automobiles, there is a need for a molding-less molding in which the peripheral portion is used in a bare state without a molding, and in the above-described method, the transfer mark of the supporting ring of the glass peripheral portion is reduced in quality. was insufficient to obtain respond to the needs become a drawback.
[0011]
The present invention is intended to solve the above-mentioned disadvantages of the prior art, and eliminates a support ring transfer mark generated on a peripheral portion of a glass plate, improves molding accuracy and strength, and performs operations from molding to cooling. It is an object of the present invention to provide a quenching and strengthening apparatus for a glass plate, which efficiently performs a process and prevents the glass plate from being scratched or cracked by a support ring.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a ring (abutting ring) for supporting a glass plate from above when cooling the glass plate is provided with a cooling device on the upper side of a pair of upper and lower cooling devices having a cooling air ejection hole. Arranged on the air ejection hole surface, the glass plate is floated by the pressure difference of the air ejected from the upper and lower cooling devices, and the upper peripheral edge of the glass plate is pressed and held against the contact ring provided on the upper cooling device while cooling. It is intended to provide a quenching and strengthening apparatus for a glass sheet, characterized in that:
[0013]
That is, the quenching and strengthening method for a glass sheet according to the present invention is such that the glass sheet to be quenched and strengthened is substantially horizontal, and the upper and lower cooling air ejecting devices arranged on both the upper and lower sides thereof respectively form the glass sheet. in quenching strengthening method of the glass plate to quench strengthening the upper and lower blowing cooling air, contact with a shape corresponding to the shape of the glass plate on the side opposite to the glass plate of the upper cooling air ejecting device provided a ring, and stronger than the cooling air blowout pressure of the cooling air blowout pressure from the glass plate downwardly from the upper side, it floated lower surface side of the glass plate by the upper and lower ejection air pressure differential, the upper surface of the glass plate that the the abutment ring while maintaining the spacing between the upper cooling air ejecting device is pressed against the glass plate peripheral edge, quenching strengthen the glass sheet It is a symptom.
[0014]
Further, the quenching and strengthening device for a glass sheet according to the present invention includes an upper cooling air blowing device, a lower cooling air blowing device, and a transfer for loading a glass sheet bent between the upper and lower cooling air blowing devices. Means for quenching and strengthening the glass sheet, wherein the upper and lower cooling air blowing devices are capable of floating the glass plate by a difference in the blowing air pressure between each other, and the glass of the upper cooling air blowing device is provided. On the side facing the plate, a contact ring having a shape corresponding to the shape of the glass plate is provided, and the upper surface side peripheral portion of the glass plate floated by the blown air pressure difference is pressed against the corresponding contact ring, while maintaining the distance between the upper surface and the upper cooling air ejecting device of the glass plate, which has features in that it is configured to cool the glass sheet .
[0015]
[Action]
In the cooling zone, the glass sheet is lifted from the cooling ring that has been conveyed into the cooling zone due to the pressure difference between the upper side and the lower side of the glass sheet. The peripheral edge of the floated glass plate is pressed and held by a contact ring disposed above.
[0016]
In particular, before the glass plate is floated, the cooling air is sprayed from above and below the glass plate with a pressure difference that does not cause the glass plate to float, and the surface of the glass plate is cooled to some extent before the glass plate is floated. The deformation of the glass plate due to the pressure difference of the cooling air is prevented.
[0017]
【Example】
FIG. 1 is an explanatory view showing an example of the entire configuration of a forming and cooling mechanism including a quenching and strengthening device for a glass sheet according to the present invention. The glass sheet forming and cooling mechanism 1 has a conveying means 3 such as a conveyor or a roller for conveying a glass sheet 2 to be formed. The glass conveying surface side is covered with a heating zone roof 4 for maintaining a high temperature. The glass sheet 2 whose temperature has been raised to the softening point is conveyed by the conveying means 3 as shown by the arrow A, and is supplied into the forming zone 5.
[0018]
A molding die including an upper die 6 and a lower die 7 is provided in the molding zone 5. In practice, the lower die 7 is provided with a glass plate transfer roller (not shown) which is formed with a plurality of slits having a comb- shaped cross section and which can move up and down. Elevating mechanism for vertically operating mechanism and transfer roller for further upper die 6 and / or the lower die 7 in the forming zone 5 or comprises a vacuum drive apparatus such as a vacuum suction mechanism provided in the upper die 6 (not shown) Various drive control mechanisms 8 are provided.
[0019]
A ring heating zone 9 is provided adjacent to the molding zone 5. A press ring 40 that supports the glass plate 2 and presses it against the upper mold 6 during molding is accommodated in the ring heating zone 9 and is heated to a predetermined temperature. As shown in FIG. 2, an elastic heat insulating cloth 17 is attached to the upper surface of the press ring 40. Its on the outer peripheral side has a supporting member 16 supports the press ring 40, it transports.
[0020]
By providing the heat insulating cloth 17, cracks due to thermal strain when the glass plate 2 at the time of molding comes into contact with the press ring 40 are prevented. To The glass plate 2 which is heated to approximately 640 ° C. or higher, generation of mold marks strain which is formed on the glass plate 2 side softened when pressed against a ring 40 made of a hard rigid material such as metal is prevented .
[0021]
The glass plate 2 whose periphery is supported by the press ring 40 is pressed against the upper die 6 as shown in FIG. A vacuum suction port 18 is provided on the molding surface (lower surface) of the upper die 6, and has a structure in which the glass plate 2 can be suction-held by a vacuum device (not shown) via a heat insulating cloth 19.
[0022]
In addition, even if the glass plate 2 is press-formed by the upper die 6 and the lower die 7, the peripheral portion of the glass plate 2 is deep-bent formed after the press forming. It may be pressed against the upper die 6 by the press ring 40, and furthermore, without press-forming the lower die and the upper die, the peripheral portion of the glass plate 2 is pressed against the upper die 6 by the press ring 40 and bent. You may.
[0023]
A cooling zone 11 is provided adjacent to the molding zone 5 and on the opposite side of the heating zone 9. In the cooling zone 11, a cooling air ejection device 12 including an upper cooling device and a lower cooling device is provided. A slit (not shown) is formed on the cooling air ejection surface side (upper surface side) of the lower cooling device in the same manner as the lower die 7, and a roller (not shown) for transferring a glass plate is mounted in this slit so as to be able to move up and down. May be configured. The cooling zone 11 further accommodates a drive control mechanism 13 including a cooling air ejection control mechanism and, if necessary, a mechanism for elevating and lowering a glass sheet transfer roller.
[0024]
The glass plate 14 that has been quenched and strengthened in the cooling zone 11 is carried out by the transfer device 15 as shown by the arrow B and transferred to the next step. The transfer device 15 has a structure capable of continuously transferring the press ring 40 supporting the glass plate from the heating zone 9 to the cooling zone 11 through the forming zone 5. In this case, the transport driving means such as a driving chain rather it may also be provided continuously from the heating zone 9 to the cooling zone 11 may be provided to divide so as to be passed the rings within each zone.
[0025]
FIG. 4 is an explanatory diagram showing another example of the overall configuration of the forming and cooling mechanism including the quenching and strengthening device for a glass sheet according to the present invention.
[0026]
An upper die 6 is provided above the molding zone 5. Below the upper mold 6, there is provided a press ring 40 that supports the glass plate 2 during molding and presses the glass sheet 2 against the upper mold 6. The press ring 40 can be moved up and down from below the conveying means 3 to the upper mold 6 so as to press the glass plate 2 conveyed from below the conveying means 3 toward the upper mold 6.
[0027]
At this time, it is preferable that the press ring is previously heated to the temperature of the glass plate (about 640 ° C. or higher) at the lower standby position. This prevents cracks due to thermal strain when the glass plate 2 at the time of molding contacts the press ring 40. When the press ring 40 is made of a hard material such as a rigid metal, the surface thereof is mirror-finished to be formed on the glass plate 2 side softened when the press ring 40 is pressed against the glass plate 2. Mold distortion can be prevented.
[0028]
The glass plate 2 whose periphery is supported by the press ring 40 is pressed against the upper die 6 as shown in FIG. Thereafter, the press ring 40 is lowered and retracted while the glass plate is suction-held by the upper mold 6, and the cooling ring 10 is moved downward from the cooling zone 11 side to the upper mold. Next, the glass plate 2 is placed on the cooling ring 10 and transported to the cooling zone 11, where the glass plate 2 is rapidly cooled and strengthened.
[0029]
The glass plate 14 thus quenched and strengthened in the cooling zone 11 is carried out by the transfer device 15 as shown by the arrow B and transferred to the next step. In this case, the felt-like elastic insulation fabric comprising a heat insulating material such as Kaoru aromatic polyamide, it is preferably attached to the surface of the cooling ring 10. This is because mold distortion when the glass plate 2 comes into contact with the cooling ring 10 can be prevented.
[0030]
In addition, as shown in FIG. 4, it is preferable that cooling zones 11 and 11 ′ are arranged on both sides of the molding zone 5. This is because the cooling rings 10, 10 'alternately advance and retreat from the left and right sides of the molding zone 5, so that when one of the cooling rings 10 is in the cooling step, the other cooling ring 10' is moved to the upper die 6 in the molding zone. From the glass plate 2, and the tact time can be reduced.
[0031]
FIG. 5 shows an example of the configuration of the cooling air ejection device 12 according to the present invention. Each of the upper cooling device 20 and the lower cooling device 21 has an air ejection surface formed with a cooling air ejection hole (not shown) facing each other. Blower or cooling air that is pumped from the accumulator (not shown) is blown from above and below. Bent glass sheet 2 is conveyed between the cooling ring 10 while being supported by the upper cooling device 20 and the lower cooling device 21, cooling air is blown from above and below by the cooling devices 20, 21.
[0032]
In this case, the cooling air ejection pressure from the lower cooling device 21 is made larger than the cooling air ejection pressure from the upper cooling device 20 so that the glass plate 2 can be lifted from the cooling ring 10 by the difference between the upper and lower ejection air pressures. I do.
[0033]
On the cooling air ejection surface side (lower surface side) of the upper cooling device 20, a contact ring 22 having a shape corresponding to the outer peripheral shape of the glass plate 2 is provided. The outer edge of the upper surface of the glass plate 2 that floats from the cooling ring 10 due to the difference between the upper and lower jet air pressures abuts on the contact ring 22. In this manner, the glass plate 2 is held in a state in which the glass plate 2 is in contact with the ring 22 by the jet air pressure from below.
[0034]
The abutment ring 22, as shown in FIG. 6, the tooth tips are notches 23 on the lower surface side of the glass plate 2 abuts formation to form a discontinuous structure flat comb shape. It is desirable to mount the mesh member 24 covering the tooth tips of the comb teeth shape.
[0035]
With such a configuration, the cooling air at the glass plate contact surface flows through the notch 23 to enhance the cooling effect. Further, when the glass plate 2 is pressed against the contact ring 22 as shown by the arrow C, it is possible to suppress the occurrence of transfer marks of the contact ring 22 on the glass plate 2. Further, at least one of the upper cooling device 20, the lower cooling device 21, and the contact ring 22 is provided with a drive mechanism operable in a horizontal direction so that the glass plate 2 can slide on cooling. Is preferred. Thus, the cooling effect is enhanced.
[0036]
The processing flow of the glass plate by the quenching and strengthening device for a glass plate having the above configuration will be described with reference to FIG.
[0037]
First, in step 30, the glass plate 2 (FIG. 4) heated to near the softening point in a heating furnace such as a roller hearth or a gas hearth is conveyed to the forming zone 5 as indicated by an arrow A. At this time, the press ring 40 waiting under the molding zone 5 is heated and kept at a predetermined temperature (step 31).
[0038]
In the forming zone 5, the peripheral edge of the lower surface of the supplied glass sheet 2 is supported by a press ring 40 (step 32), and the press ring 40 is raised, and as shown in FIG. To perform a forming press (step 33). At this time, vacuum suction is simultaneously performed from the upper mold 6 side, so that the glass plate 2 is securely brought into close contact with the mold surface.
[0039]
After the molding, the cooling ring 10 is moved from the cooling zone 11 side to the molding zone 5 while the press ring 40 is lowered and the glass plate 2 is suction-held by the upper mold 6. The glass plate 2 sucked and held by the upper die 6 in the molding zone 5 is transferred onto the cooling ring 10. Further, the glass plate is transported to the cooling zone 11 while being supported on the cooling ring 10 (Step 34).
[0040]
Place the glass plate between the upper cooling device 20 and the lower cooling device 2 1 (FIG. 5), supporting a glass plate lower surface by the upper and lower ejection air pressure difference from the upper and lower cooling devices 20, 21 by ejecting a cooling air The glass plate is lifted off the ring and the peripheral edge of the upper surface of the glass plate is pressed against the contact ring 22 (step 35). In this manner, the glass plate is cooled from the upper and lower surfaces and strengthened while the upper surface of the glass plate is held in contact with the contact ring 22.
[0041]
In this cooling step, if the difference in air pressure blown from the upper and lower cooling devices when pressing the upper peripheral portion of the glass plate against the contact ring is too large, the glass plate may be deformed by the pressing force during cooling, and The transfer trace of the contact ring is strongly formed. On the other hand, if the difference between the upper and lower pressures is too small, the glass sheet cannot be pressed against the contact ring during cooling, and the accuracy of the shape of the peripheral edge of the glass sheet decreases. Therefore, it is desirable that the pressure difference between the jet air from the vertical cooling devices 20 and 21 is 100 to 500 mm (water column) depending on the shape and thickness of the glass plate.
[0042]
The glass sheet thus quenched and strengthened is carried out of the cooling zone (step 36). In this case, rather it may also be weakened gradually ejection pressure difference of the cooling air is placed on a cooling ring waiting downward to lower the glass plate, after supporting the glass plate lower surface by increasing the cooling ring The jetting of air may be stopped and the glass plate may be lowered with the glass plate resting on the cooling ring. Further, it is preferable to introduce another transport means for transporting the cooling zone to a post-process. As a result, the cooling ring can be moved to the forming zone again, and shortening of tact can be achieved.
[0043]
The glass sheet unloaded from the cooling zone is transferred to another transfer device, transferred to the next step, and subjected to another process (step 38). On the other hand, the cooling ring 10 waits (step 37), and picks up the next glass sheet after it is formed in the forming zone 5 (FIG. 4).
[0044]
【The invention's effect】
As described above, in the present invention, since the bent glass plate is cooled in a floating state, the cooling air can be flowed almost uniformly over the entire glass surface, the cooling effect is enhanced, and the mold by the supporting member is used. formation of traces distortion is suppressed. Also, when the glass plate floats, the upper surface side (concave surface side) of the glass plate is held against the contact ring, so that the mold mark formed on the glass plate becomes the concave side of the glass plate. When used as a window glass, there is no problem in appearance because the mold mark is on the inner side of the car.
[0045]
Furthermore, since the cooling is performed while supporting the peripheral edge of the upper surface of the glass plate with a contact ring having a discontinuous structure, the transfer trace by the contact ring is minimized, and the cooling air due to the contact ring is trapped. The glass plate can be sufficiently cooled without causing it to be sufficiently strengthened to the edge of the glass plate, and the shape accuracy of the peripheral portion of the glass plate can be improved. Such an effect is particularly effective when applied to a tempered glass for an automobile used without a molding.
[0046]
In particular, by allowing the upper and lower cooling air ejection pressures to be changed to any size at any timing, the surface of the glass plate is cooled down to some extent, and then the glass plate is floated at a predetermined timing, so that the glass plate is raised. The glass sheet can be rapidly cooled and strengthened without being deformed by the pressure difference of the cooling air for floating.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory view showing an example of the configuration of the entire quenching and strengthening apparatus for a glass sheet according to the present invention.
FIG. 2 is a sectional view of a press ring according to the present invention.
FIG. 3 is a cross-sectional view showing a state where a glass plate is pressed against an upper mold for forming a glass plate according to the present invention.
FIG. 4 is a configuration diagram of a quenching and strengthening apparatus for a glass sheet according to another example of the present invention.
[5] structure explanatory diagram showing an example of engaging Ru cold 却装location structure to the present invention.
FIG. 6 is a configuration explanatory view of a contact ring according to the present invention.
FIG. 7 is a flowchart illustrating an example of a quenching and strengthening step of a glass sheet according to the present invention.
[Explanation of symbols]
2: Glass plate 3: conveying means 5: forming zone 6: upper die 7: lower mold 9: Pre Sri heating zone for heating kept warm ring 10: Cold 却Ri ring 11: Cooling zone 12: cooling air discharge device 14 : Glass sheet 15 which has been cooled and strengthened after bending: transport means 20: upper cooling device 21: lower cooling device 22: contact ring 40: press ring

Claims (6)

The glass plate to be quenched strengthened in the substantially horizontal, said quenching enhanced by blowing cooling air from the upper and lower side of the glass plate by the upper and lower sides ejection upper cooling air ejecting device and the lower cooling air arranged respectively device In the quenching and strengthening method for a glass sheet, a contact ring having a shape corresponding to the shape of the glass sheet is provided on a side of the upper cooling air ejection device facing the glass sheet, and cooling air is ejected from a lower side of the glass sheet. The pressure is made stronger than the cooling air ejection pressure from the upper side , and the lower surface side of the glass plate is floated by the upper and lower ejection air pressure difference, and the gap between the upper surface side of the glass plate and the upper cooling air ejection device is maintained. against the glass plate peripheral edge portion in the contact ring, quenching strengthening method for a glass plate, characterized in that quenching strengthen the glass sheet. After bending a glass sheet by a glass plate suction capable of holding upper and press the support ring, a method for enhancing quenching, the lower surface side periphery of the glass plate during the bending in the press support ring After supporting and pressing the upper mold side, and holding the glass plate with the upper mold to bend and form the glass sheet, the support ring for press is retracted from the glass sheet and the cooling support ring is positioned below the upper mold. receiving a glass plate that is bent by moving said conveying between the upper and lower side of the cooling air blowout device, quench strengthening method for a glass plate 請 Motomeko 1 wherein quenching strengthen the glass sheet. Pressing the peripheral edge of the glass plate against the contact ring while maintaining the space between the upper surface side of the glass plate and the upper cooling air blow-out device, before quenching and strengthening the glass plate , beforehand from the lower side of the glass plate. claim 1 or 2 quenching method of strengthening glass sheet according glass plate a pressure difference between the cooling air blowout pressure from the cooling air blowout pressure and upper quench the glass plate as the pressure difference that will not float. In a quenching and strengthening apparatus for a glass sheet, comprising: an upper cooling air jetting device; a lower cooling air jetting device; and a transfer means for loading a bent glass sheet between the upper and lower cooling air jetting devices. The upper and lower cooling air blowing devices can float the glass plate by the difference of the blowing air pressures, and the upper cooling air blowing device has a shape of the glass plate on a side facing the glass plate. A contact ring having a corresponding shape is provided, and a peripheral edge of the upper surface side of the glass plate floated by the jet air pressure difference is pressed against the contact ring, and a gap between the upper surface side of the glass plate and the upper cooling air jetting device is provided. A quenching and strengthening apparatus for a glass sheet, wherein the apparatus is configured to cool the glass sheet while holding the glass sheet. An upper die for sucking and holding the glass plate, further comprising a vertically movable press support ring provided below the upper die, the press support ring, bent lower surface side peripheral edge of the glass plate during molding parts is intended to press the upper mold side to support the said transfer means receives the glass sheet after the press support ring is retracted in a state in which the glass sheet is sucked and held by said upper die, the upper and lower quenching tempering apparatus for a glass plate according to claim 4, wherein the cooling support ring is configured to carry between the side cooling air ejecting device. The upper cooling air ejecting device and the lower cooling air ejection apparatus, any quenching tempering apparatus for a glass plate of each of the ejection claim 4 or 5, wherein is configured to be arbitrarily changed air pressure at the timing.

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