JPS6321541Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ring mold for bending and forming plate glass transported horizontally from a heating furnace.

As a device for forming curved glass such as automobile windshields, a device that transports sheet glass vertically from a heating furnace and press-forms this sheet glass between molds, or a device that transports sheet glass horizontally from a heating furnace. , a device that press-forms this plate glass between upper and lower molds, or a plate glass that is carried out in a horizontal state from a heating furnace and placed on a mold,
There are devices that use the weight of sheet glass to form the shape.

An apparatus as shown in FIG. 1 is used as an apparatus for continuously forming plate glass in a horizontal state. That is, an air table 2 with hot air blow-off holes formed on the upper surface is arranged in the lower part of the heating furnace 1, and a plate glass 3 which is floated and supported by the hot air is placed on the upper surface of the air table 2. While moving the glass plate 3, it is heated to near its softening point, and then the glass plate 3 is pulled out onto the press bed 4 and positioned. Then, by raising the ring mold 5 at the position where the pressbed 4 is to be fitted into the positioned glass plate 3, the plate glass 3 is placed on the ring mold 5, and the plate glass 3 is press-formed into a predetermined shape between the upper die 6 and the ring mold 5. I try to do that.

In such a press molding apparatus, only one side of the ring mold 5 on which the plate glass 3 is placed is supported by the holder 7 via the stay 8, so that the ring mold 5 is likely to be twisted. Therefore, the thickness of the ring mold 5 is required to be approximately 10 mm. The thicker the ring mold 5 is, the more easily the surface of the glass plate 3 will be damaged, and if the upper end of the ring mold 5 and the glass plate 3 come into close contact, the cooling air blown out from the nozzle at the quenching position will become trapped inside the ring mold 5. Therefore, the degree of reinforcement in the peripheral area of the glass plate, which has a significant effect on the strength of the glass, is also inferior.

Therefore, conventionally, as shown in FIG. 2, a through hole 9 is formed in the upper part of the ring mold 5, and the upper end is formed into a rack-shaped part 10 in which a convex part 10a and a concave part 10b are continuous. A notch 11 is formed in a part of the part, into which a glass time keeping tool is inserted when removing the plate glass after molding from the ring mold 5.

However, if a concavo-convex portion is formed on the upper end of the ring mold 5 as in the past, a part of the sheet glass softened during molding will sag into the concave portion 10b, and the tooth shape of the rack-like portion 10 will be formed on the periphery of the sheet glass after molding. A mark will be formed. For this reason, it is conceivable to cover the rack-shaped portion 10 with a stainless steel wire gauze, but in this case, although the sagging of the sheet glass is improved to some extent, it has the disadvantage that marks of the wire gauze will be left on the periphery of the sheet glass.

The present invention was developed in view of the above-mentioned conventional circumstances, and its purpose is to avoid leaving mold marks on the periphery of the glass plate when bending the glass plate in a horizontal state, and to quickly cool the glass for strengthening. To provide a ring mold for forming plate glass, which can effectively perform the following steps.

In order to achieve this purpose, the ring mold according to the present invention has a tip having an inwardly inclined surface on the upper edge on which the plate glass is placed, a metal woven fabric made of stainless steel fiber is covered with the tip, and a ring mold is provided. A through hole is formed in the thickness direction at the top of the mold,
The gist is that the through hole and the inclined surface are communicated through a vertical hole.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

FIG. 3 is an overall perspective view of the ring mold according to the present invention. The ring mold 20 has a fan shape when viewed from above, and one side of the ring mold 20 is supported by a holder that can be moved up and down. The ring mold 20 has through holes 21 for ventilation formed in the thickness direction over the entire circumference, and the upper end on which the plate glass 22 is placed is a tip 24 having an inclined surface 23. Metal woven fabric made of stainless steel fiber 2
5 (for example, Naslon: manufactured by Nippon Seisen Co., Ltd.). Further, at a predetermined location on the upper end of the ring mold 20, a recess 26 is formed into which a holder for holding the molded glass plate 22 is inserted.

Further, in the upper part of the ring mold 20, as shown in FIGS. 4 and 5, through holes 27 different from the through holes 21 are formed in the thickness direction.
7 and the inclined surface 23 of the apex 24 are communicated through a vertical hole 28.

With such a configuration, the plate glass 2
The cooling air blown to the periphery of the lower surface of the plate glass 22 reaches the periphery of the plate glass 22, passes through the vertical hole 28, passes through the through hole 27 that communicates with the vertical hole 28, and is effectively discharged, which has the greatest effect on the glass strength. It is possible to rapidly cool and strengthen the surrounding area of the glass plate.

6 and 7 are schematic perspective views of a molding device using the ring mold 20, and the molding device 3
A large number of heated air blow-off holes 32 are formed on the upper surface of the air table 31 disposed in the heating furnace 0.
The heated air blown out from the blow-off holes 32 floats and conveys the flat glass sheet before forming.

Further, following the air table 31, a press bed 34 having a large number of heated air blowing holes 33 formed on the upper surface is provided, and an upper mold 35 that can be raised and lowered is placed above the press bed 34.

A cooling air blowing device 36 is provided next to the press bed 34. This blowing device 36 has a cooling air blowing nozzle 37 formed on its upper surface. In the illustrated example, only the lower blowing device is shown, but in the case of an actual molding device, the lower blowing device 36
An upper blowing device having a blowing nozzle formed on the lower surface is also provided above the blower.

Further, a holder 38 is provided in the area where the blowing device is provided. This holding body 38 consists of a pair of side plates 39, 39 and a horizontal plate 40 installed between the tips of these side plates 39, 39.
Rack rods 42, 42 are attached to the rack 9 via support columns 41, and a pinion 43 is meshed with the rack rods 42. Further, the side plate 39 is placed on an angled support plate 45 fixed to the upper end of a rod 44 which is moved up and down by a cylinder device or the like. By moving the support plate 45 up and down, the holding body 38
The holding body 38 also moves up and down, and by rotating the pinion 43 forward and backward, the holding body 38 moves back and forth.

On the other hand, the horizontal plate 40 of the holder 38 is provided with support rods 46, 46 that protrude rearward (to the left in the figure), and these support rods 46, 46 support the front end side of the ring mold 20. . Also, the horizontal plate 40
The bases of crank-shaped stoppers 47, 47 are rotatably mounted on the outer side of the support rods 46, 46.

In the above process, the rod 44 is projected upward to raise the holder 38 placed on the support plate 45, and then the pinion 43 is rotated to move the holder 38 backward while sliding on the support plate 45. The ring mold 2 is moved to and attached to the holder 38.
0 on the press bed 34. Incidentally, when the holder 38 moves up, the teeth of the rack rod 42 move while slidingly contacting the teeth of the pinion 43.

From this state, the rod 44 is caused to retract and the holder 38 placed on the support plate 45 is lowered. Then, since the ring mold 20 is set slightly larger than the press bed 34,
As the holding body 38 descends, the ring mold 20 descends to surround the press bed 34, and the holding body 38
When the lowering of the ring mold 20 stops, the ring mold 20 is loosely fitted into the press bed 34 as shown in FIG.

On the other hand, as the holding body 38 descends, the crank-shaped stoppers 47, 47 also descend, and as the holding body 38 descends, the intermediate portions of the crank-shaped stoppers 47, 47 touch the plate-shaped stoppers 48, 48 erected on the front edge of the press bed 34 main body. abutting, crank-shaped stopper 47;
47 pivots upward about its base.

Due to this rotation, when the holding body 38 descends to the final position, the crank-shaped stopper 4
The tips of the molds 7 and 47 are stopped near the front end of the press bed 34, above the upper surface of the press bed 34, and at a position where they do not interfere with the upper end of the ring mold 20. This state is the state in which the plate glass 22 is ready for pressing.

From this state or in parallel with changing to this state, the rods 50, 5 equipped with shuttles 49, 49
0 into the heating furnace by a drive means (not shown), the rear end of the plate glass 22 on the air table 31 is supported by the shuttles 49, 49, and the rod 5
By moving 0,50 forward, plate glass 2
2 is pulled out from the air table 31 onto the pressbed 34. Then, the plate glass 22 is pressed into the press bed 3.
4 and its front end abuts the tips of the crank-shaped stoppers 47, 47, and the plate glass 22
is on the pressbed 34, and the crank-shaped stopper 4
Its four corners are positioned by 7, 47 and shuttles 49, 49.

Thereafter, the rod 44 is caused to make a protruding motion, and the holder 38 and the ring mold 20 attached thereto are lifted up. Then, as the ring mold 20 rises, the outer peripheral edge of the plate glass 22 on the press bed 34 is accurately placed on the ring mold 20, and the further ring mold 20
As the glass plate 22 rises, the glass plate 22 is transferred from the pressbed 34 to the ring mold 20. Then, in parallel with the rise of the ring mold 20, the upper mold 35 descends, and the plate glass 22 is press-molded into a predetermined shape between the ring mold 20 and the upper mold 35.

After molding, the upper die 35 rises, and at the same time the pinion 43 rotates in the opposite direction to the above-mentioned direction, and the holder 38
is moved forward (to the right in the figure), and as shown in FIG. 7, the ring mold 20 on which the formed plate glass 22 is placed is positioned on the cooling air blowing device 36.

In this state, cooling air is blown onto the glass plate 22 on the ring mold 20 to rapidly cool and strengthen the glass plate 22. In this quenching process, the upper end of the ring mold 20 is covered with a metal woven fabric 25 having air permeability, and a through hole 27 is opened in the thickness direction of the ring mold 20 in the upper part of the ring mold 20. Since the through hole 27 and the inclined surface 23 of the tip 24 of the ring mold 20 communicate with each other through the vertical hole 28, the blown cooling air flows between the ring mold 20 and the glass plate 22, especially between the periphery of the glass plate and the ring mold. It is discharged without being trapped in the space S with 20, and the cooling effect can be enhanced.

When the cooling of the plate glass 22 is completed, the holder 51 located above the blowing device is lowered by a separate drive means, and the hook 52 provided at the lower end of the holder 51 is moved into the recess of the ring mold 20. 2
Then, the holder 51 moves inward and inserts the hook 52 into the recess 26 to hold the glass plate 22. Thereafter, the holder 51 removes the glass plate 22 from the ring mold 20, moves to the front conveyor belt 53 (see FIG. 6) while holding the glass plate 22, and places the glass plate 22 on the conveyor belt 53. . The plate glass 22 is then sent to the next process by a conveyor belt.

Next, an automobile windshield formed using the ring mold according to the present invention and an automobile windshield formed using a conventional ring mold will be compared based on reference photographs.

Reference photos 1 and 2 show a car windshield fixed between a white board and a projector, and the perspective distortion of the windshield is projected onto the white board surface. Of these, reference photo 1 shows a ring mold according to the present invention. Reference photo 2 shows the case when a conventional ring mold was used.

As is clear from this photograph, in the case of the present invention, almost no perspective distortion occurs at the periphery of the automobile windshield. On the other hand, in the case of the conventional example, perspective distortion caused by mold marks occurs at the periphery of the automobile windshield (particularly the lower edge and upper side in this experimental example).

In addition, reference photos 3 and 4 are photographs of reflection distortion by projecting the image of the lattice plate onto a car windshield. Of these, reference photo 3 shows the result when the ring mold according to the present invention is used, and reference photo 4 shows the result when the ring mold according to the present invention is used. This is the case using a conventional ring mold.

As is clear from this photo, in the case of the present invention, the lattice image projected on the periphery of the windshield is regularly curved, whereas it is projected on the periphery of the windshield formed by the conventional ring mold. It can be seen that the lattice image is extremely irregular and the reflection distortion is large.

As is clear from the above explanation and reference photos, according to the present invention, the upper end of the ring mold for bending is held on the slanted surface while holding the peripheral edge of the plate glass transported horizontally from the heating furnace. Since the tip is covered with a woven cloth made of stainless steel fibers, the area of the ring mold that comes into contact with the periphery of the plate glass is reduced.
The mold marks that occur during molding can be minimized, and cooling air passes between the metal fabrics, so the space formed between the living mold and the glass sheet, especially the space formed around the periphery of the glass sheet. Since the cooling air is not trapped in the glass, rapid cooling can be performed effectively, and the degree of reinforcement of the peripheral edge of the glass sheet can be increased. Since a through hole is formed in the upper part of the ring mold and the through hole and the inclined surface of the apex are communicated with each other through a vertical hole, many effects such as the above-mentioned rapid cooling effect can be further enhanced.

[Brief explanation of the drawing]

The drawings show a conventional example and an embodiment of the present invention. FIG. 1 is a side view of a press molding apparatus using a conventional ring mold, FIG. 2 is a partially enlarged perspective view of a conventional ring mold, and FIG. Figure 3 is an overall perspective view of the ring mold according to the present invention, Figure 4 is a sectional view of the same ring mold, and Figure 5 is an enlarged view of a part of the ring mold according to the present embodiment with the metal woven fabric removed. 6 and 7 are schematic perspective views of the molding apparatus. In the drawings, 20 is a ring mold, 22 is a plate glass, 23 is an inclined surface, 24 is a tip, 25 is a metal woven fabric, 27 is a through hole, and 28 is a vertical hole.

Claims (1)

[Scope of Claim for Utility Model Registration] In a ring mold that supports the lower peripheral edge of a glass plate transported in a horizontal state from a heating furnace and curves the glass plate between it and an upper mold or by the weight of the plate glass, this ring A tip with an inclined surface on the inside is formed around the upper end of the mold that contacts the plate glass, and this tip is further covered with a metal woven fabric made of stainless steel fibers, and a ring is provided on the top of the ring mold. A ring mold for forming plate glass, characterized in that a through hole is formed in the thickness direction of the mold, and the through hole and the sloped surface of the tip of the ring mold communicate with each other through a vertical hole.