JPH0583491B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for bending a glass plate, and in particular, a method for deep bending a glass plate by pre-bending and final bending in connection with a vacuum suction type. The present invention relates to a method for bending a glass plate.

[Prior art] Curved glass used for automobile windshields, rear windows, etc. is formed by heating and softening a glass plate of a predetermined size, bending it into the desired shape using a mold, and rapidly cooling it. It is something that will be done.

Recently, as a method for processing such curved glass, a method using an air form type mold is relatively common.

The air form type mold referred to here is, for example, one whose lower side is curved and used as a mold surface, and this lower side has many suction holes connected to an appropriate suction means such as a vacuum pump. The bending process is performed by suctioning a glass plate that has been softened by heating.

In this case, the glass plate that has been heated and softened in the heating chamber is carried into a molding room that is separate from the heating chamber, and then the mold on which the glass plate is placed is lifted and pressed against a vacuum suction mold. After performing a predetermined bending process on the glass plate placed between the mold and the mold, the vacuum suction operation is stopped and the glass plate removed from the vacuum suction mold is placed on a support frame, and then cooled. A process of horizontal transport into the chamber was used.

However, with this method, apart from shallow bending, when attempting to deep bend a glass plate, deep bending is difficult, and the glass plate is easily deformed, so that the desired shape cannot be achieved. There was a problem that it was not possible to perform deep bending with high precision.

On the other hand, the method of bending a glass plate using an air-form type mold disclosed in Japanese Patent Publication No. 57-23647 involves blowing out heated gas from below the glass plate in a heating chamber. The glass plate is first pre-bent by lifting it up and suctioning it along the mold surface of the vacuum suction mold. Next, the bending process is performed through two steps: deep bending by pressing the glass plate from below using a ring-shaped mold. Deformation can be prevented for the time being.

[Problems to be Solved by the Invention] However, in the case of the above-mentioned bending method disclosed in Japanese Patent Publication No. 57-23647, the preliminary bending of the glass plate is performed through suction holes provided in the mold surface of the vacuum suction type. This is done while adsorbing the glass plate to the mold surface using only the suction force obtained. At this time, although the glass plate adsorbed to the mold surface of the vacuum adsorption type is supported by the heated gas jetting out from below, the sleeve part of the glass plate is not always sufficiently adsorbed. Therefore, it is difficult to reliably perform the necessary preliminary bending, and there have been problems in that it may not be possible to perform deep bending with sufficient accuracy during main bending.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for bending a glass plate that forms highly accurate deep-bent glass by ensuring preliminary bending of the glass plate.

[Means for Solving the Problems] In order to achieve the above object, the present invention was constructed as follows.

That is, the method for bending a glass plate according to the present invention includes a step of transporting a heated glass plate to the lower side of a vacuum suction mold provided in a molding chamber, and a step of transporting a heated glass plate to the lower side of a vacuum suction mold provided in a molding chamber, and a step of transporting a heated glass plate to the lower side of the vacuum suction mold provided in a molding chamber. A process of adsorbing the glass plate to the vacuum suction mold and bending it with a bending die under heated gas spouted upward from the vacuum suction mold, and cooling the support frame supporting the glass plate that is detached from the vacuum suction mold. The bending mold includes a preliminary mold with a shallow bend and a main mold with a deep bend, which can freely move forward and backward into the position of the vacuum suction mold, and the bending mold includes a preliminary mold with a shallow bend and a main mold with a deep bend. The process of adsorbing a glass plate to a mold and bending it with a bending die involves supporting the glass plate with a preliminary mold, adsorbing it to a vacuum suction mold, and performing preliminary bending. Its structural feature is that it is a process in which the main mold is moved to the position of the glass plate in place of the preliminary mold while being adsorbed to the mold, and the glass plate is finally bent by the main mold.

[Function] Therefore, by using a preliminary mold, the glass plate can be adsorbed while being well adapted to the mold surface of the vacuum suction mold, and the sleeve portion of the glass plate can also be bent in advance. can be applied. At this time, the glass plate can be placed on the preliminary mold with the aid of heated gas blown upward from the hearth bed, so that the contact surface of the glass plate with the preliminary mold is not damaged or deformed. It is possible to prevent this from happening.

After completing such sufficient preliminary bending, the main bending can be performed using the main mold, so that the glass plate can be deep bent with high precision.

[Example] Hereinafter, an example of the method for bending a glass plate according to the present invention will be described based on the drawings.

1 to 1 are schematic diagrams showing an example of the process during bending, and the glass plate G is heated to, for example, 600°C to 700°C while being moved horizontally in a heating chamber (not shown). In the step (b), the molded material is transported to the hearth bed 3 located below the vacuum suction mold 1 in the molding chamber 9 via a predetermined jig 4 or by a roller, and in the step (b), it is transported upward from the hearth bed 3. The mold is placed on the preliminary mold 5 having a shallow bend while being supported in a buoyant manner with the aid of jetted heated gas. The preliminary mold 5 used in this case is formed in a ring shape so as to be able to support the glass plate G via its peripheral edge, and is kept waiting at a position lower than the top surface of the hearth bed 3. When the glass plate G is carried in, it is raised to support the glass plate G.

Next, in step C, this preliminary mold 5 is further raised in the direction of the mold surface 2 of the vacuum suction mold 1, and the glass plate G is brought close to the mold surface 2 of the vacuum suction mold 1. The glass plate G is adsorbed and held on the mold surface 2 by the suction force. At this time, glass plate G
Since it is supported by the preliminary mold 5, it is possible to perform preliminary bending while making it fit well with the mold surface 2. In particular, for parts such as the sleeve part 6 of the glass plate G that cannot necessarily be brought into close contact with the mold surface 2 of the vacuum suction mold 1 due to differences in curvature, the preliminary mold 5 is used to approximate the desired shape. Can be bent.

After completing the preliminary bending, as shown in step D, the preliminary mold 5 is lowered to the original position with the glass plate G adsorbed to the vacuum suction mold 1, and the bending that had been made separately is completed. By moving the deep main mold 7 below the glass plate and raising it as in step E, the glass plate G is pressed in the direction of the mold surface 2 of the vacuum suction mold 1 to reach the desired depth. Bending process is performed to form a bent shape. The main mold 7 used in this case is formed into a ring shape so as to be able to support the glass plate G via its peripheral edge.

After completing this final bending, as in step F, with the glass plate G adsorbed to the vacuum suction mold 1, the main mold 7 is evacuated to its original position and is placed on standby separately. After moving the supporting frame 8 to a predetermined position below the glass plate G, the vacuum suction operation of the vacuum suction type 1 is stopped.

When the vacuum suction operation of the vacuum suction mold 1 is stopped, the glass plate G is detached from the vacuum suction mold 1 by gravity or by blowing out pressurized gas, and is placed downward in advance, as shown in step G. It is received by a support frame 8 which is provided with a support frame 8.

The glass plate G placed on the support frame 8 in this manner is transported to the quenching chamber 10, which is a separate room, and strengthened, as shown in step 1, and the bending and strengthening are completed.

[Effects of the Invention] As described above, according to the present invention, by using a preliminary mold, the glass plate can be adsorbed while being well adapted to the mold surface of the vacuum adsorption type, and moreover, the sleeve of the glass plate can be The required pre-bending can also be applied to the parts.

After completing such sufficient preliminary bending, the main mold is used to perform the final bending, and in particular, in order to deeply bend the sleeve portion of the glass sheet, the main mold is used to press the sleeve portion of the glass sheet to perform the final bending. Therefore, it is possible to perform deep bending into a desired shape, and it is also possible to perform deep bending with high precision on the glass plate.

[Brief explanation of the drawing]

FIGS. 1 to 1 show schematic diagrams of the working steps of the method for bending a glass plate according to the present invention. 1... Vacuum suction mold, 2... Mold surface, 3... Hearth bed, 4... Jig, 5... Preliminary mold, 6... Sleeve part, 7... Main mold, 8... Support frame, 9... Molding chamber, 10... Quenching chamber, G... Glass plate.

Claims (1)

[Claims] 1 The process of transporting the heated glass plate to the bottom of the vacuum suction mold installed in the molding chamber, and the process of transporting the heated glass plate to the bottom of the vacuum suction mold installed in the molding chamber, and applying a vacuum to the glass plate under the heated gas jetted upward from the hearth bed positioned below the glass plate. A bending process for a glass plate, which consists of the steps of adsorbing a glass plate to a suction mold and bending it using a bending die, and transporting a support frame supporting the glass plate to a cooling room to be detached from the vacuum suction mold. In the method, the bending mold includes a preliminary mold with a shallow bend and a main mold with a deep bend, which can move forward and backward into the position of the vacuum suction mold, and the glass plate is adsorbed to the vacuum suction mold and bent. In the process of bending with a mold, the glass plate is supported by a preliminary mold and adsorbed to a vacuum suction mold to perform preliminary bending, and then the preliminary bending is performed while the glass sheet is adsorbed to the vacuum suction mold. A method for bending a glass plate, characterized in that the main mold is moved to the position of the glass plate instead of the mold, and the glass plate is finally bent by the main mold.