JPS599489B2 - tempered glass plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides high impact strength. 5 mm ~3,5
The present invention relates to a tempered glass plate having a thickness of 100 mm.

For automobile window glass, a glass plate is suspended using a glass plate hanger, placed in a heating furnace, and heated to a temperature above the strain point of the glass plate.
The glass plate is heated to a temperature below its softening point and press-formed into the desired shape, and then the glass plate is rapidly cooled by blowing cooling air onto both sides of the glass plate at the same time. Air-cooled tempered glass plates, which have been solidified using stress and have a compressive stress layer remaining on their surfaces to improve strength, are widely used.

In the past, glass sheets with a thickness of 4 mm to 6 mm and 11 mm were used as window glass plates for automobiles, but recently, with the demand for lighter automobiles, glass plates with a thickness of 2.5 mm to 3.5 mm have been used. Glass was requested.

When manufacturing tempered glass, when a glass plate is heated, press-formed, and air-cooled to strengthen it using a hanging method like the one described above, a concave suspension is placed on the part of the glass plate where the tip of the screw comes into contact with the glass plate. Holes will occur, but if the thickness of the glass plate to be bent and strengthened is as thin as 2.5 to 3.5 mm, the glass plate must be heated to a sufficiently high temperature to increase the degree of reinforcement. Therefore, there is a drawback that the depth of the concave hanging hole becomes deep.

Therefore, with regard to air-cooled tempered glass sheets with a thickness of 2.5 to 3.5 In 1K, the above-mentioned suspension may occur due to the impact received on the edges of the laminated glass when transporting this type of tempered glass or handling it such as fitting it into a car window. Breakage often occurred from the hole, making handling extremely difficult and impractical.

The present inventor has developed a 2.5 to
As a result of research into the causes of breakage of glass plates for the practical use of 3.5 mm thick tempered glass, it was found that the depth of the concave hanging hole that is created when the screw tip of the glass plate hanging part bites into the hanging part of the glass plate. We found that there is a significant relationship between strength and strength.

As a result of further experimental research on this point, we found that in order to prevent the tempered glass from breaking due to the stress at the edges that occurs when tempered glass is fitted into an automobile window, for example, when a tempered glass plate is fitted with a hammer, , tempered glass with a height of 80111R or higher in the hammer strength test (this corresponds to a breaking stress of approximately 1000K,/(7)2).

) was statistically found to be practically unbearable.

As a result of studies based on this knowledge, the inventor of the present invention found that by setting the depth of the suspension hole of the tempered glass plate to 0.05 to 0.4511N, the hammer strength can be increased to 8011 J: or more, and the practical strength can be increased. The present invention has been proposed as the present invention.

That is, in the present invention, a glass plate having a thickness of 2.5 mm to 3.5 mm is suspended by a hanging tool, placed in a heating furnace, heated to a temperature above the strain point and below the softening point of the glass plate, and then rapidly cooled. In the tempered glass plate that has been strengthened using
ml1~0. The present invention relates to a tempered glass plate characterized by having a thickness in the range of 45 mm.

Hereinafter, the present invention will be further explained in detail with reference to FIGS. 1 and 2.

In the tempered glass 10 of the present invention, the depth a of the concave hanging hole 11 formed in the glass plate at the screw contact portion of the hanging tool during bending of the glass plate is within the range of 0.05mlr to 0.45ml. By doing so, the tempered glass plate 1
The decrease in strength of the hanging hole portion of 0 is suppressed to a range that does not cause any practical problems.

The depth of the suspension hole in this tempered glass plate is 0. When the hammer strength becomes smaller than 45 mN, the hammer strength becomes less than 8Qmm, which is insufficient for practical use, and 0.05++ lm.
Even if it is smaller, the hammer strength will be less than 80 dragons, resulting in insufficient strength and being unsuitable for practical use.

When the depth of the hanging hole is smaller than 0.05111, the strength decreases because the glass plate is not heated enough to form the hanging hole.
This is thought to be due to the occurrence of cooling cracks and insufficient cross-sectional strain.

In addition, when bending a glass plate by suspending it with a hanging tool, it is normal to suspend the glass plate with multiple hanging tools, so multiple hanging holes are generated, but the depth of these hanging holes is All sizes are 0.05 to 0. Preferably, the distance is within the range of 45 mm.

It has been experimentally confirmed that the decrease in strength near the hanging holes of the tempered glass plate is due to the depth of the hanging holes, and that the diameter of the hanging holes does not have much of an effect.

The relationship between the depth of the hanging hole in a tempered glass plate and the hammer strength is shown in Figures 5 to 7, and the reason for the limitation on the depth of the hanging hole mentioned above will become clearer from these figures. .

Furthermore, from this figure, for example 2. 5 In a tempered glass plate with a thickness of 1II, the depth of the hanging hole is 0. 0 7 Ilm
In the tempered glass plate of ~0.25 m and 3.0 thickness, the depth of the hanging hole is O: 06 M1 ~ 0.35 mm, or 3
．． In a tempered glass plate with a thickness of 5 mm, the depth of the hanging hole is 0.
05111~0. A range of about 4 5 11 is found to be particularly optimal as it has sufficient practical strength, ie, a hammer strength test of 110 nm or more.

Next, the third to
This will be explained according to the apparatus shown in FIG.

In FIG. 3, a glass plate 1 to be processed is suspended by a hanger 2, conveyed in the direction of the arrow by a hanger conveyor 3, passed through a heating furnace 4 to be heated, and is heated by a press device 5 as necessary. It is stopped at that position and press-formed into a desired curved shape, and then immediately moved to the position of the reinforcing device 6, where it is strengthened by air cooling.

In the present invention, the glass plate that is suspended by the hanger 2, heated, press-molded, and strengthened is 2. 5
mrtt ~3,5 +u+ Because it is thin, the depth of the hanging hole becomes deep, or if the heat capacity of the hanging tool is small, the heating of the glass plate in the hanging tool part becomes insufficient.
Since the strength of the hanging hole that comes into contact with the screw portion 7 of the hanging tool 2 tends to decrease, the hanging tool should be one that has a small amount of heat capacity so that the hanging hole does not dig in and insufficient heating occurs. That is, lightweight metal hangers each weighing 200 I or less can be optimally used.

For example, when manufacturing tempered glass with a thickness of 2.5 mm, 30
&~4Cl metal hanging tool, 35.9-45g metal hanging tool when manufacturing 3-inch thick tempered glass, and 3.5
When manufacturing thick tempered glass, 40 so to 100 I
metal fittings are best.

Also, when bending and strengthening the glass plate, the number of hangers used to hang the glass plate is limited because if the weight of the glass plate per hanger is too large, the depth of the hanging hole will become deep. The weight of such a glass plate is preferably set to 1.5K9 or less.

In addition, the number of hanging boxes for hanging one glass plate is as follows:
For operational reasons, it is preferable to use about 3 to 6 hanging tools, and it is practically preferable that the spacing between the hanging tools is about 160 to 300 m11, but of course the number and spacing are not limited to these.

In addition, the shape of the screw at the tip of the suspension is as shown in Figure 4b, for example.
It is preferable that the shape is such that stress concentration occurring in the glass plate portion of the screw contact portion can be reduced as much as possible.

Examples of the present invention will be described below.

Example 1 A glass plate with a thickness of 3.5 mm (dimensions: length 563 ml, width 1182 ml, weight 3960 mm) was prepared in the same shape as shown in Fig. 4, with a screw tip diameter b of 3IIIl+I and R of 0. 3
It was hung at 4 points using 4 hanging tools (weight: 45I) and placed in a heating furnace, heated to 680°C to 690°C, and heated to 5000°C.
Press bending into a curved shape of R, then immediately quench with air (wind pressure 10001nllllA.9, air cooling time 1
5 seconds) and was strengthened, and 20 tempered glass plates of various types with various hanging hole depths were prepared for each hanging hole depth.

The depth of the suspension hole was adjusted to a predetermined depth by appropriately selecting the weight, heating temperature, material, shape, etc. of the suspension hole.

The depth of the various hanging holes prepared in this way (0, 0.05
, 0.1 0 , 0.15 , 0.20 ,
0.25, 0.30, 0.35, 0.40
, 0.45, 0.50 (Tomo)) was subjected to a hammer strength test, and the relationship between the depth of the hanging hole and the average hammer height in the hammer strength test is shown in Figure 5. show.

Example 2 A glass plate with a thickness of 3 mm (dimensions: length: 500 mm, width: 1100 mm, weight: 3900. 3 Hang it at 4 points using 4 R hanging tools (weight 40 g) and put it into the heating furnace 6
Heated to 80°C to 690°C, pressed and bent into a 6000R curved shape, then immediately quenched with air (wind pressure 1
100ffllXA,? , air cooling time: 15 seconds), reinforced glass plates having various hanging hole depths were prepared, 20 sheets each for each hanging hole depth.

The depth of the suspension hole was adjusted to a predetermined depth by appropriately selecting the weight, heating temperature, material, shape, etc. of the suspension hole.

The depth of the various hanging holes prepared in this way (0, 0.05
,0.10,0.15,0.20,0.25,0.30
, 0.35 , 0.40 , 0.45 , 0.5
A hammer strength test was conducted using a tempered glass plate of 0 (i), and the relationship between the depth of the suspension hole and the average height of the hammer in the hammer strength test is shown in FIG.

Example 3 Glass plate with a thickness of 2.5 mm (dimensions: length 496 mm, width 106 mm
1111 - weight 3200/) was hung at 4 points using four hanging tools (weight 35.!l/) having a shape similar to that shown in Fig. 4 and having screw tip diameter b of 3 silk and radius R of 0.3 R. It was put into a heating furnace and heated to 680 to 690°C, press-bent into a curved shape of IOOOOR, and then immediately quenched with air (wind pressure 1000mlnAll, air cooling time 15 seconds),
Various types of tempered glass plates that had been strengthened and had various hanging hole depths were prepared, 20 each for each hanging hole depth.

The depth of the suspension hole was adjusted to a predetermined depth by appropriately selecting the weight, heating temperature, material, shape, etc. of the suspension hole.

The depth of the various hanging holes prepared in this way (0, 0.05
,0.10,0.15,0.20,0.25,0.30
, 0.3 5 , 0.4 0 , 0.4 5 ,
A hammer strength test was conducted on a tempered glass plate of 0.5 o (mm)), and the relationship between the depth of the hanging hole and the average value of the hammer height in the hammer strength test is shown in Figure 7.

As is clear from this figure, the tempered glass plate with a thickness of 2.5 glass has a thickness of 0. 4 5 mlN to dog and 0.0
If the strength is less than 5, the result of the hammer strength test will be 80 or less, indicating that the strength does not meet the practical strength.

In addition, the hammer strength test of the tempered glass plate was performed by placing a wooden spacer 22 with a thickness of 10 mm and a width of 20 mm on top of a wooden form 21 finished with the same curvature as the glass plate 20 as shown in Figure 8. A reinforced glass plate is placed on top of the reinforced glass plate, and a 1.6 KP rubber hammer 23 is placed at the same position on the opposite side of the terminal adhesion part or hanging hole part, increasing the height one by one to create a hammer fall area 24 (diameter). c = 65 mm) and let the glass plate 20
It is a display comparison of the height when broken, and the higher the height, the higher the breaking strength.

[Brief explanation of the drawing]

Fig. 1 is a front view of the tempered glass plate of the present invention, Fig. 2 is a cross-sectional view of the hanging hole portion of the tempered glass plate of the present invention, and Fig. 3 is an apparatus for manufacturing the tempered glass plate of the present invention. 4 is a diagram showing a state in which the glass plate is suspended by a hanging tool, Figures 5 to 7 are diagrams showing the relationship between the suspension hole depth and strength of a tempered glass plate, and Figure 8 is a diagram illustrating a hammer strength test method. 1: Glass plate, 2: Hanging tool, 3: Hanger conveyor, 4
: Heating furnace, 5: Press molding device, 6: Air cooling reinforcement device, 7
: Hanging screw, 10: Tempered glass plate, 11: Hanging hole.

Claims (1)

[Claims] 1. A tempered glass plate obtained by suspending a glass plate with a thickness of 2.51 to 3.5 mm using a hanging tool, heating it to a temperature above the strain point and below the softening point of the glass plate, and then rapidly cooling it to strengthen it. The depth of the concave hanging hole created at the contact part with the hanging tool is set to 0. 0 5 11m~0. 4 5 mW+
A tempered glass plate characterized by having a range of.