JPS5913639A - Manufacture of bent tempered glass plate - Google Patents

Abstract

PURPOSE:To form a bent tempered glass plate of high quality, by heating the whole of a glass plate to a temp. close to the softening point, heating a part of the plate along the bending line to a temp. above the softening point, bending the plate, precooling the higher temp. part, and quenching the whole plate. CONSTITUTION:The whole of a glass plate 1 (a symbol 3 is a suspender) is uniformly heated to a temp. close to the softening point, e.g., about 640-730 deg.C, and an electric current is supplied to a heating wire 4 placed along the bending line 2 to heat only a part close to the line 2 to a temp. above the softening point and about 20-80 deg.C above the temp. of the other part. The plate 1 is sharply bent along the line 2 using a pair of concave and convex pressing plates. The higher temp. part along the line 2 is then precooled to a temp. almost equal to the temp. of the other part by blowing air or the like, and the plate 1 is tempered by quenching in a cooling apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a bent differentiated glass sheet that is bent sharply.

Recently, sharply bent bent tempered glass plates have been used for the rear windows of automobiles, and the required sharply bent bent tempered glass plates are becoming increasingly diverse.

Generally, tempered glass having a curved surface is heated to a curved surface of a desired shape by using a bending die under its own weight or by pressing, and then is rapidly cooled and then hardened. This heating heats the entire glass board to a level near the softening point, e.g., about 640 to 73
This is done by heating at 0°C. If heated too high above the softening point, undesirable deformations such as doubling will occur. However, if there is a part that is to be bent sharply, it is necessary to heat the part on a softening point plate and soften it sufficiently before carrying out the bending process using a controlled force. Can not. j7+- is like this JJ-A
Place the entire glass plate in the heating furnace near the temperature point, and place the conductive printed wire, nichrome, along the sharp bending line of the glass plate. Print or attach wires, etc., or hold the heater wires at a constant distance from the bending line, and apply voltage to these heater wires to partially heat the area near the bending JHI curve to a temperature above the softening point. After heating the material to a temperature of 100%, the material is bent and kneaded by its own weight or by one press.

However, after bending, the glass plate has different heat properties near the sharp bending line and in other parts, so if it is rapidly cooled and strengthened, there will be heat cracking and L.
After cooling, plane stress occurs, causing the crushed product to drop to a low level of -11-. fjl,j<-&'', during the destructive test, there may be cases where the shattered product type, which is exploding according to the regulations, is not added to J Engineering S of reinforced glass for automobiles.

Refreshingly, even after the bending process, the temperature in the vicinity of the bending process is high, so the temperature in the vicinity of the bending process is high, so the problem is that the bending process is unstable.

An object of the present invention is to produce a bend-strengthened horn lath board that has sharp bends and i-processed parts, even if the bend line for sharp bending is partially heated above the softening point along the bend line.
l-) Bending process curve until cooling after processing - The cedar is stable and does not deform, and there is little stress in the flat part after cooling due to heating to a high temperature for more than 1 minute on the roof part 7, etc. To provide a method for manufacturing a bend-strengthened glass plate without degrading crushing quality.

Manufacturing method of bending strengthened glass plate according to the present invention-2, heating the glass plate, drawing out the sharp curve, and cooling 110-) In the manufacturing method of the tempered glass plate, the entire glass plate is heated in a heating furnace to a temperature near the softening point of the glass. T11. At the same time, the bending line to be sharply bent is partially heated along the bending line to a softening point plate - ybr -h-, and then the bending line is sharply bent 5, Continued -L Fail This is a method in which the high-temperature heated part is pre-cooled to a temperature of about 11 for another 1'+15 minutes, and then the rapid cooling is strengthened.

In a preferred embodiment of the method for manufacturing a curved reinforced glass board according to the present invention, when processing the curved glass plate into a sharp curve, the temperature is set to be about 30 to 80° C. higher than the partial heating temperature along the curved line.

Other preferred I of the method for producing a bent tempered glass sheet according to the present invention
In Mr. B, the front bending process was performed using a convex press member A.1 and a plurality of elements that were divided by a line connecting the narrow part of the curvature and hinged to each other. This is done by a pressing method using a molding surface metal corresponding to the convex surface and a second press member of a concave shape that can be formed by regulating the movement position of the element. Pre-cooling is performed by bending the glass plate through a plurality of nostles provided along the hinge line inside the concave portion of the second press member. f! This is done by blowing hard energy towards the person.

Furnace, Fig. 1 (a) and (b) shows a sharply curved and bent rear sharp perspective view of an automatic type as 1+11 of a bent reinforced glass plate. Fig. 1 (a) is a hatchback type; b) The figure is of the notchback type.

Both the glass plates 1 and 20
~ BOR It is bent with a curvature of 8 degrees. To manufacture this bent tempered glass plate by bending it using the press method,
As shown in FIGS. 2(a) and 2(b), the glass plate 1 is suspended and heated by the hanging tool 3, and the heater wire 4 is arranged along the bent line of the glass plate 1. and heat some parts to a higher temperature than other parts. Glass plate】Overall heating temperature d
: Temperature near the softening point, e.g. 640 to 730°C, heating temperature for partially heating to high temperature along the curved line is 1, above the softening point, 30 to 80°C above the general heating temperature.
The temperature is relatively high, for example, 670 to 810°C, more preferably 710 to 760°C. These temperatures 131 are selected appropriately depending on the type of glass, the degree of bending, the fIKm of the bending device, etc. The temperature 131 is adjusted so that the glass is in a softened state suitable for each bending process, and during the bending process and the like. It is necessary to make sure that the front and back tablikas do not change.

In addition, it is desirable that the overall heating temperature and the heating temperature at which the bending portion is partially heated to a high temperature are close to each other in length within a range that allows bending to a desired curvature of 1n1 along the desired sharp bending line. It is particularly preferable that the difference in temperature between the lake and the lake is approximately within 50°C. In the above example, heater wires are arranged along the curved line of the glass plate at a given rectangular interval to locally heat the curved line. A method of local heating by contacting with
A method of printing a heater wire on the curved line of the glass plate and locally heating the printed heater wire can be similarly applied.

When sharply bending a glass plate, it is generally done by a press method or by a gravity method.

And if necessary, pressing means can be used for assistance. For example, when molding is performed using a press method, a suspended crow plate is inserted between the first and second press parts, which have mutually complementary shapes and face each other. The mud 2 is pressed using a press system to form the desired shape.

The molding surfaces of the first and second paulownia press parts may each have a desired molding curved surface shape, or one of them may have a convex shape with a desired molding curved surface, and the other molding surface may have a desired molding contour. It may also have a concave shape. In particular, when sharp bending is performed using the press method, the first press part is made concave because it is easy to get scratches, etc., and this concave press part A"A"k is a small curved part. It is possible to form a concave surface in the contour portion corresponding to the convex surface of the second press part H by dividing the concave elements along a connecting line, and by hinge-coupling the two elements with each other, and by regulating the movement position of the elements. Press molds are often used.

Therefore, an example will be described in which the bending process of the method of the present invention is performed using this press die.

FIG. 3 is a partial sectional view schematically showing a state in which a glass plate is sandwiched between the press molds as described above. [Crow plate] Press mold convex 2
37-shaped first press member 5 and a second press member having concave portions 6A and 6B. After the concave mold 6A of the second press part and the concave mold 6A of the main part of the recess are advanced and the glass plate 1 is sandwiched and pressed, the concave mold 6B is moved by the air cylinder 8 to form the concave molds 6A and 6B. The surface of the first press member to be formed corresponds to the convex 81j and the surface of the press member 5 of Autumn Silk 2. Therefore, even in the convex second press member 5 and the concave die 6B of the second press part, the glass plate 1 is bent (bent) and the required bending process is performed. It goes without saying that the portion of the glass wall facing the glass wall is partially heated to a high temperature.

This bending process using a press mold is conventionally commonly performed (detailed explanation is omitted with a *).

A device for carrying out the method of the present invention [in one embodiment]
A wall air blowing pipe 9 is installed along the hinge line in the hollow part of the concave shape of the second press part as shown in FIG.
The air blowing pipe 9 (L is equipped with multiple nozzles that blow air in the direction of the curve when the glass plate 1 is being bent sharply.The glass plate 1 is pressed by this press mold. At the same time, or as soon as possible thereafter, air was blown from a nozzle to partially heat the area to a high temperature (41
Pre-cool for 4 minutes to approximately the same temperature as the other parts. The time required is generally just a few seconds! !
It is necessary to write a short poem of this level in 1 [11].

Alternatively, a portion of the convex surface of the first Luz shape corresponding to the bending line of the glass plate may be hollowed out, and an air blowing pipe may be installed in that portion to pre-cool the sharply bent portion of the glass plate.
A small hole may be made in the molding surface of the press mold at a portion corresponding to the bending line of the glass plate, and air may be blown out through this hole.

In addition, although the above example is an example in which an air blowing pipe is provided inside the concave portion of the second press section, the curved portion of the glass plate is not pre-cooled between the press bending device and the air cooling strengthening device. Immediately after the nitrogen blowing pipe is set and processed, the bent leg part of the crow plate that has been sharply decoyed can be pre-cooled with a nitrogen blowing vibrator.2. . Alternatively, move the air blowing vibrator to the bending curved part of the horned rice in the press machine, and then move the air blowing vibrator to the bending curved part of the press machine. Part or plan? 'f1°4. You can also do that.

It is easy to design the equipment to perform pre-cooling from one side of the glass plate after the glass plate is sharply bent V1, but it is easier to do it from both sides of the glass plate. You can also do it.

Next, as in the general air cooling strengthening process, the cooling equipment e (transferred and air cooling strengthened 2.

As described above, by the method of the present invention, the shimmering J lath board is made into a shell.
By bending and strengthening the song, it is possible to obtain a high-quality song with reinforcement force 2 without having to make a stable bending section Ff reinforced crow board based on the setting-1.

Note that the pre-cooling of the bent line portion of the glass plate of the present invention after bending is to stabilize the curvature of the sharply bent bend line portion and to prevent undesirable deformation from occurring. It is also applicable to a method of bending a glass plate that does not require any processing.

[Brief explanation of drawings]

Figures 1 (a) and (b) are perspective views of an automobile rear window, which is an example of a glass plate manufactured by the method of the present invention, and Figures 2 (8,) and (b) are respectively Figure 1 (a). as well as(
FIG. 3 is a partial schematic diagram of the press bending device. 1...Glass plate, 2...Bending line. , 3... hanging tool, 4
...Heater wire, 5...Convex type, 6A, 6B...Concave type, 7...Hinge, 8...Air cylinder, 9...
Air blowing vibe. (→zuself) ￥I (α) a→ ￥￥I (α)

Claims (1)

[Claims] (1) In a method of manufacturing a bent tempered glass sheet in which a glass sheet is heated, sharply bent, and then rapidly cooled, the entire glass board is heated in a heating furnace to a temperature near the softening point of the glass, and the glass sheet is sharply bent. After partially heating to a humidity above the softening point along the curved line to be bent, sharp bending is performed, and then the high-temperature heated portion is pre-cooled (ii. (2) A method for manufacturing a bent tempered glass sheet, characterized in that the heating temperature of a portion along the bending line is approximately 20 to 80° C. higher than that of the other portion. 4
j. A method for manufacturing a bend-strengthened horn lath board according to claim 1. (8) The bending process consists of a convex first press part phase and a plurality of elements divided by a line connecting a portion of small curvature and hinged to each other, and regulating the movement position of the element. It is possible to form a molding surface corresponding to the convex surface by a press method using a concave second press part, and the pre-cooling or the second press part is used. Claim 1: This method is performed by blowing air from a plurality of nozzles provided along the hinge inside the concave part of the press part toward the curved line where the glass plate is bent.
The song in this section is about the manufacturing method of reinforced glass board.