JPH11228161A - Glass mold - Google Patents

Abstract

(57) Abstract: Provided is a glass forming die capable of forming a bent shape of a glass plate into an arbitrary shape. According to the present invention, a local forming member (20) is provided on a glass forming die (10), and the local forming member (20) forcibly bends a part that is difficult to bend or a part that has a curvature smaller than the curvature of its own weight deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass forming die, and more particularly to a glass forming die which bends a glass sheet heated to near a softening point by bending the glass sheet by its own weight while supporting an outer peripheral portion of a lower surface of the glass sheet. .

[0002]

2. Description of the Related Art There is known a glass forming mold in which a glass sheet is heated to a temperature near a softening point in a heating furnace, and the glass sheet is bent and formed by supporting and bending the glass sheet by its own weight. The glass mold is formed in a ring shape so as to support the outer peripheral portion of the lower surface of the glass plate. Therefore, the glass plate supported by the glass forming die is bent and formed into a shape (the lower surface is convex) in which the vicinity of the center portion is most flexed by its own weight.

[0003]

However, since the conventional glass forming mold is formed by bending the glass sheet only by being deformed by its own weight, the control of the shape is limited, and the glass is formed as designed. There is a disadvantage that the yield rate of glass sheets cannot be improved.

In particular, rear glass applied to automobiles is
It is not formed by bending at a constant curvature, but is formed by bending so that the curvature in the vicinity of the corner portion is smaller than in other portions. Therefore, there is a drawback that it is difficult to apply the above-mentioned conventional glass forming die as a forming die for a glass plate having no such a constant curvature. The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a glass mold capable of forming a bent shape of a glass plate into an arbitrary shape.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a molding die body formed in a shape substantially conforming to the contour shape of a glass plate, and is provided with a predetermined temperature on the molding die body. In a glass mold that supports the outer peripheral portion of the lower surface of the heated glass plate and bends the glass plate by bending the glass plate by its own weight, a part of the glass plate is pressed against the molding die body to force the part. It is characterized in that a locally formed member that bends and forms is provided.

According to the present invention, a locally formed member is provided in a molding die body, and a portion which is hardly bent or a portion having a curvature smaller than the curvature of its own weight deformation is forcibly formed by the locally formed member. Thereby, the present invention can form the bent shape of the glass sheet into an arbitrary shape. Further, according to the present invention, the local forming member includes a pressing member and a driving unit, and the driving unit moves the pressing member from a position retracted from the glass plate to a part of the glass plate,
This part is pressed and bent. Therefore, in the present invention, local bending can be achieved with a simple structure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the glass mold according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a part of a glass forming line to which a glass forming die 10 of the present embodiment is applied. A heating furnace 12 is provided upstream of the glass mold 10 in the glass sheet transport direction. A roller conveyor 14 is provided in the heating furnace 12, and a glass plate 16 to be formed is conveyed in the heating furnace 12 by the roller conveyor 14 in a direction indicated by an arrow in the drawing, and near a softening point (about 640 ° C.). Heated until.

The glass plate 16 thus heated is sucked by the suction device 18 and moved up near the outlet of the heating furnace 12. Then, the glass mold 10
Is moved to a position below the glass plate 16, the suction device 1
The suction by 8 is released, and the glass plate 16 falls onto the glass mold 10. As a result, the glass plate 16 is supported by the glass mold 10 at the outer peripheral portion of the lower surface, and is bent and formed by its own weight. The bent glass plate 16 is
The air-cooling strengthening device 50 is supported by the glass mold 10.
Is conveyed to the cooling stage S between the upper outlet head 52 and the lower outlet head 54 to be air-cooled.

As shown in FIG. 2, the contour of the molding die body 11 of the glass molding die 10 is formed in a trapezoidal shape so as to support the outer peripheral portion of the glass plate 16. The glass mold 10 described in the present embodiment is a glass mold that bends rear glass of an automobile. The rear glass does not have a fixed curvature. In particular, there is a high demand for forming a corner (a part) with a smaller curvature than other parts. For this reason, it was difficult to form the mold using a conventional mold only based on its own weight deformation. The glass forming die 10 of the present embodiment solves the above-mentioned problem.

As shown in FIG. 2, local molding members 20 are provided at four corners of the molding die body 11. The local forming member 20 is a member which forcibly presses and bends each corner 17 of the glass plate 16 and includes a roller 22 as a pressing member and a roller driving mechanism (driving means).
24 is the main configuration. The roller 22 is formed of a material having a low thermal conductivity (for example, polyimide resin (trade name: Vespel)) so as not to rapidly cool the corner portion 17 when it comes into contact with the corner portion 17. This is because if the corner portion 17 is rapidly cooled, defects such as heat cracks and cracks may occur in the portion due to thermal strain.

As shown in FIG. 3, the roller driving mechanism 24
Has an air cylinder device 26 as its power source. The air cylinder device 26 is connected to an air pump (not shown) via a hose 28, and the compressed air from the air pump is supplied via the hose 28 so that the piston 30 can be extended. The piston 30
The lever 32 is connected to the tip of the. The lever 32 is fixed to a side surface of a pin 34, and the pin 34 is rotatably supported via a bearing 36 on a flange portion (extended portion) 11 </ b> A formed at a corner of the molding die body 11. I have. Therefore, the piston 30 of the air cylinder device 26
Is extended, the pin 34 can be rotated counterclockwise in FIG. 3 via the lever 32, and when the piston 30 is contracted, the pin 34 can be rotated clockwise in FIG. .

A fork-shaped joint 38 is attached to the upper part of the pin 34. A pin 40 is provided between the two forked portions of the joint 38.
A bar 42 is supported swingably. Bar 42
A substantially central portion thereof is supported by the pin 40, and FIG.
The roller 22 described above is rotatably supported on the left end 42A. The right end 42B of the bar 42 on FIG.
Are slidably supported on the inclined surface 44A of the guide block 44.

The inclination angle of the inclined surface 44A of the guide block 44 is set as follows. That is, the joint 38 is moved to the pin 34 by the air cylinder device 26.
When the head 22 swings around the roller 22, the roller 22 is
A range between a position retracted from the glass plate 16 through the position 2 (a position indicated by a solid line in FIG. 3) and a position contacting the corner portion 17 of the glass plate 16 (a position indicated by a two-dot chain line in FIG. 3). The tilt angle is set so that it can be moved with.

In this embodiment, a driving mechanism including the air cylinder device 26 is applied as a driving means of the roller 22, but the present invention is not limited to this.
Any form can be used as long as it is a mechanism (for example, a gear mechanism using a rack and a pinion) that can reciprocate between the position retracted from the glass plate 16 and the pressing position of the glass plate 16.

Next, the operation of the glass mold 10 configured as described above will be described. First, before the glass plate 16 is supported, the roller 22 of the locally formed member 20 is moved to the glass plate 16.
At the position where it was evacuated. And heating furnace 1
When the glass plate 16 conveyed from the mold 2 is supported on the mold body 11, the local forming member 20 is driven to drive the glass plate 16
Is forcibly bent. That is, when air is supplied to the air cylinder device 26 to extend the piston 30, the power is transmitted to the joint 38 via the lever 32 and the pin 34, and the joint 38 is rotated counterclockwise around the pin 34 in FIG. Rotate in the direction of rotation. When the joint 38 rotates, the bar 42 starts to rotate counterclockwise about the pin 34, and
Is moved upward along the inclined surface 44A of the guide block 44, so that the bar 42 swings to the left with the pin 40 as a fulcrum. As a result, the roller 22 is moved from the standby position indicated by the solid line in FIG.
6 is moved toward the corner 17, and is pressed in contact with the corner 17 to forcibly bend the corner 17. The bending amount of the corner 17 is controlled by the pressing force of the roller 22 or the pressing time of the roller 22.

As described above, in the present embodiment, the local forming member 20 is provided on the forming die body 11 and the local forming member 2 is provided.
Since the corner 17 having a small curvature of the rear glass for automobiles is forcibly bent by setting 0, even a glass sheet having a complicated shape such as a rear glass for automobiles can be formed into a product as designed. In the present embodiment,
Although the glass mold 10 for the rear glass for automobile has been described, the present invention is not limited to this, and can be applied to side glass for automobiles, glass for ships, and glass for railways. Further, the portion to be forcibly bent is not limited to the corner portion, but may be a portion which is hardly bent by its own weight. Further, in the present embodiment, the form in which the glass plate 16 that has passed through the heating furnace 12 is bent and supported by the glass forming mold 10 has been described. However, the present invention is not limited to this. It is also possible to apply a configuration in which the material is bent by passing through a heating furnace.

[0017]

As described above, according to the glass forming die of the present invention, a local forming member is provided on the main body of the forming die, and the local forming member reduces the curvature which is hardly bent or smaller than the curvature of its own weight deformation. Since a part of the glass plate is forcibly bent, the bent shape of the glass plate can be formed into an arbitrary shape.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a glass forming line including a glass forming die.

FIG. 2 is a plan view of a glass mold according to the embodiment of the present invention.

FIG. 3 is an enlarged structural view of a locally formed member provided in the glass mold of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Glass forming die 11 ... Molding die main body 12 ... Heating furnace 16 ... Glass plate 20 ... Local forming member 22 ... Roller 24 ... Roller drive mechanism 26 ... Air cylinder device 42 ... Bar 44 ... Guide block

Claims (4)

[Claims] 1. A glass mold body having a shape substantially conforming to the contour shape of a glass plate, and supporting an outer peripheral portion of a lower surface of the glass plate heated to a predetermined temperature on the mold body to form the glass. In a glass forming die for bending by bending a plate by its own weight, a local forming member for pressing a part of the glass plate and forcibly bending the part is provided on the forming die body. Glass mold. 2. The local forming member comprises: a pressing member for pressing a part of the glass plate; and a reciprocating movement of the pressing member between a position retracted with respect to the glass plate and a part of the glass plate. Along with
2. The glass forming die according to claim 1, further comprising: driving means for applying a force for pressing the portion to the pressing member. 3. The molding die body is formed in a ring shape having an outer periphery substantially matching the contour shape of the glass plate, and has an extended portion protruding outward on the outer periphery of the molding die body. The glass forming die according to claim 1, wherein the local forming member is provided in the extending portion. 4. A pressing member which has a pressing portion at one end which abuts on a glass plate and is rotatably supported by said extending portion, wherein said local forming member has a pressing portion rotatably supported by said extending portion. A driving member for rotating the pressing member, and a tapered guide member that is provided on the outer peripheral side of the rotation axis and guides the other end of the pressing member; The glass forming mold according to claim 3, wherein the pressing member is lowered by rotating the rotating member to raise the other end of the rotating member along the tapered surface of the guide member, thereby pressing a part of the glass plate.