JPH062594B2 - Method for manufacturing tempered glass plate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a tempered glass sheet, and more specifically, in a strengthening method by a nipping suspension method, at least the hoisting tool holding trace at the upper end of the glass board is The present invention relates to a method for manufacturing a tempered glass sheet with improved gripping means so that it does not remain on one side of the glass sheet.

According to the present invention, not only architectural window glass but also furniture furniture glass, cooking glass or automobile window glass, especially when attaching a tempered glass plate to the window portion of an automobile, the mall is bonded to the car body based on bond bonding. It is widely used, for example, it becomes an optimal glass plate as a window glass used in a so-called flush mount method that is inserted between the glass and the end face.

[Conventional technology]

A tempered glass plate that is one of the tempering methods for flat glass, is sandwiched with hanging tools (tongs) and suspended almost vertically, and after being heated above the strain point of the glass in a heating furnace, it is rapidly cooled to strengthen. Regarding the manufacturing method of, the window glass plate tends to be thin due to the demand for weight reduction of automobiles, the size of the window glass plate is enlarged by expanding the window part of the automobile, the method of attaching the window glass plate is improved, and the automobile window part is It is desired to smooth the outer surface of the peripheral part of the window glass plate due to the aesthetics of the above, to prevent the reduction of breaking strength from the viewpoint of safety, and to improve the gait during manufacturing, etc. Various reduction proposals have been made for the depression.

That is, for the depth of the hanging hole of the nipping trace, for example, U.S. Pat.No. 3,390,911 describes a hoisting tool for nipping glass, and when engaged with a hoisting tool having a ceramic-coated steel disk, a thickness of 2.9 mm glass plate, the hanging hole depth is 0.25m
m and is disclosed in U.S. Pat.
In the number, tongs for suspending glass in the vertical direction, particularly tongs having a clamping surface of refractory material consisting of small particles such as silicon carbide, the clamping surface of the contact block is a circle with a radius of about 3.7 mm, Al ₂ O ₃
Use the tongs consisting of
It is disclosed that the length is 0.76 mm, 0.25 mm or 0.63 mm. Further, in JP-A-56-9235, a plate thickness of 2.5 to
In a tempered glass that is hung by hanging a 3.5 mm glass plate with a suspender and heating it to a temperature not lower than the softening point above the strain point of the glass plate and then quenching to strengthen it, it occurs at the contact part of the suspender of the glass plate Described about the tempered glass plate and the manufacturing method thereof, the depth of the concave hanging hole is in the range of 0.05 ~ 0.45 mm,
It is disclosed that a lifting tool of 200 g or less is used, and regarding the adjustment of the depth of the lifting hole, it is described that the weight, heating temperature, material, shape, etc. of the lifting tool are appropriately selected to achieve the predetermined depth. It is known that

On the other hand, regarding the shape and material of the lifting equipment, see
In the 46-36539 publication, in the tempering process of automobile window glass, etc., when the plate glass is hung on a carrier and introduced into the heating furnace, the tip surface of the jaw of the hammer is surely grasped so that the upper end of the glass plate is grasped. It is disclosed that some appropriate number of concave grooves are engraved in the vertical and horizontal directions, and this is formed on a plurality of truncated pyramid surfaces, and the plate clamps for plate glass strengthening treatment are arranged in parallel on the same plane. In addition, JP-A-51-112820 describes a tongs that does not cause defects such as dents and scratches on the thermal glass plate, and the glass contact engaging member of the self-closing tongs contains substantially cobalt and iron. And a tungsten-nickel composite, which is disclosed in US Pat.
No. 69622 describes a multi-layered glass suspender that bonds the edges of two pieces of glass, and the suspender consists of a pad with a porous metal surface, and has a size of about 50 x about 25 mm ² . It is disclosed that the size is changed depending on the size.

Furthermore, JP-A-60-36340 discloses a vertical or nearly vertical position formed by a vertical upright member, a horizontal cross member and a holding means acting on the upper part of the glass sheet. It is known that a frame for holding a holding frame is described in which the holding means is applied to the upper edge of the glass plate and is freely movable in the vertical direction by lateral guidance.

[Problems to be solved by the invention]

As is apparent from the above-mentioned publications, etc., in the conventional hanging method, the hanging trace depth of the glass plate is, for example, about 0.05 to 0.80 mm, and there are no holes and the appearance is smooth. However, in view of the shape of the glass engaging member provided with tongs, it is hard to say that the glass surface is sufficiently flat and has little optical distortion. It's still not enough.

Furthermore, although the surface of the hanger that contacts the glass plate is made uneven so as to provide frictional resistance and the contact part is sandwiched from a point-like shape to a surface-like shape, the heating and cooling of this part differs from that of other parts. Therefore, the degree of strengthening tends to decrease.

[Means for solving problems]

The present invention has been made in view of the above-mentioned drawbacks of the related art, and the glass plate is sandwiched and suspended by interposing at least one plate-shaped body that has been subjected to peculiar processing between the glass plate and the tip of the hanger. Accordingly, the present invention provides a method for manufacturing a tempered glass plate that can solve the above-mentioned drawbacks.

That is, the present invention, the glass plate is hung by a suspender,
In a heat treatment strengthening method of rapidly cooling after heating to a strain point of glass or more, at least one between both front and back surfaces of the glass plate and both end portions of the hanging tool, a plurality of at least penetrating the glass plate surface. Of the tempered glass plate characterized by heat treatment strengthening by sandwiching and suspending the glass plate, with a plate-like body having a through hole provided and having a surface roughness of the surface contacting the glass plate of 10 μ or less. A manufacturing method is provided.

Here, for the plate-shaped body, boron night light,
Any refractory material such as platinum, silicon carbide, zirconia, or ceramic coated on metal etc. that is resistant to thermal shock and does not fit into glass is preferable, and preferably has a thermal conductivity equal to or greater than that of glass and has a coefficient of thermal expansion. Is smaller, the size is about 600 to 50 mm ² , preferably 400 to 100 mm ² , and if it is too large, heating of the glass plate
Cooling unevenness is likely to occur, and if it is too small, hanging marks are likely to remain on the glass surface.
It is about 6 to 0.5 mm, preferably about 5 to 1 mm due to uneven cooling and the strength of the plate, and various shapes such as circular and triangular can be adopted. Since it depends on the surface of the plate, it is preferable that the surface of the plate contacting the surface of the glass plate has a surface roughness of 10 μm or less, that is, a state as close to a mirror surface as possible. The shape of the through-holes in the cross-sectional direction provided in the plate-shaped body is not limited, but for example, about 0.5 to 3 mmφ, preferably 1.0 to 2.0 mmφ, the number of the through-holes is sufficient to maintain the required strength of the maximum plate-shaped body. Further, for example, when the air reaches the surface of the heated glass plate through the through hole during air cooling, and the cold air rapidly cools the glass to become hot air or hot air. It is preferable to provide a means or structure for discharging from the holes for more effective cooling. In addition to the above, the number of the suspension, the plate-shaped body and the through-hole, the shape, the size, the position to be arranged, the glass composition of the glass plate to be strengthened with respect to the interval, etc.
It will be more appropriate if the size, thickness, shape, degree of strengthening thereof, that is, degree of heating and rapid cooling, etc. are sufficiently taken into consideration and various factors are used for timely determination.

Furthermore, the plate-like body is arranged on at least one surface of the glass plate, particularly on the convex surface side in the case of a bent glass plate, but on the other side of the opposite surface, particularly on the concave surface side,
That is, for the tip of the hanging tool on the opposite side corresponding to the plate-shaped body, if necessary, a known and conventionally used one can be adopted, but one that does not create a hanging point hole as much as possible Often, it is preferable that the through-holes arranged in the plate-shaped body are avoided so as to be sandwiched, and the number of tips of the known suspenders is as many as possible according to the plate-shaped body. It is preferable to provide it.

[Action]

As described above, by the method for producing a tempered glass sheet of the present invention, by adopting a unique plate-shaped body,
It is possible to obtain a tempered glass plate in which the surface of the glass plate to be tempered is smooth and has almost no optical distortion, and the degree of tempering of the portion is almost the same as that of the other portion.

That is, a peculiar plate-shaped body comes into surface contact with the glass plate, and even if the opposite side thereof is, for example, the tip part of a conventional hook-shaped hanger, the glass plate is sandwiched between the flat part of the plate-shaped body and the claw-shaped tip. Since it is suspended and suspended, the gripping force on the plate side is dispersed and is not affected by the claw-shaped tip side, and at least the surface of the glass plate side on the plate side is flat and there is almost no optical distortion. Since the plate-like body with a large surface area has a through hole that penetrates to the surface of the glass plate, the temperature rise during heating can be made almost the same as the part without the plate-like body. The whole can be kept at a substantially equal temperature, and even during rapid cooling, it can be cooled almost equally to other parts without a plate, and the compressive stress on the glass surface has a large difference from the surrounding part of the plate. Not or almost the same, It improves the overall strength of the glass plate even if the addition of impulsive force, such hanging point mark is that there is no such thing as a first train point of destruction.

From this, there is almost no damage to the glass plate during manufacturing, and not only the yield can be improved, but the obtained tempered glass plate has a more uniform degree of strengthening and has an aesthetic appearance. In addition, the physical properties of the safety window glass for automobiles can be sufficiently exhibited, and the glass can be widely used for construction, electronic parts, furniture, and the like.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS.

Example 1 A glass plate 2 having a size of about 1000 horizontal × 500 mm ² vertical and a plate thickness of about 3.5 mm was used to hold the glass plate 2 with the holding bolts 3 of the lifting tool 1 as shown in FIGS. 1 and 2. The glass plate 2 has a through hole 6 with a diameter of about 2.3 mm on the side that becomes the convex surface during bending.
On the other side, the tip 4 of the clamping bolt 3 is on the opposite side, with the plate-like body 5 of (a) in FIG. 3 made of 4 × 11 mm ² and a thickness of about 2 mm of boron nitrite. Plate 5
The two through holes 6 of the glass plate are provided so as to avoid the position of the through hole 6, and the two are sandwiched between the two, and the suspender is attached to the upper end portion of the glass plate.
Arranged in a place, suspended and suspended, conveyed to a heating furnace (not shown), heated up to 650 to 670 ° C, then conveyed and bent by a press machine (not shown) After that, ordinary bending and heat strengthening treatments, in which air with a gauge pressure of about 1300 to 1500 mmAq was used for rapid cooling with an air-cooling strengthening device (not shown), were continuously performed to obtain a bending-strengthened glass plate.

When the unevenness of the hanging traces due to the holding of the hanging tool was examined for the five bending-strengthened glass plates thus obtained, the surface on which the plate-shaped body was interposed was almost flat and smooth, and there were no dents. , There is almost no optical distortion, and it does not give a feeling of strangeness in appearance compared to the surrounding surface,
The surface that directly abutted the other tip had some dents, but it did not become as deep as the conventional traces of hanging points. The degree of strengthening of the sandwiching portion and its vicinity was almost the same as that of the other portions.

Example 2 A glass plate having a width of about 1000 × a length of about 500 mm ² and a plate thickness of about 4 mm was carried out by the same hanging and clamping method as in Example 1, except that the shape of (b) in FIG. One side is about 12 mm, thickness is about 1.
An alumina plate having a size of 2 mm was used. Heating temperature is about 6
50 ~ 630 ℃, flat plate, gauge pressure 1100 ~ 1300m
A tempered glass plate was obtained by quenching with mAq air for heat strengthening.

When the obtained five tempered glass plates were tested and examined in the same manner as in Example 1, the results were almost the same in appearance and degree of strengthening.

〔The invention's effect〕

As described above, according to the present invention, when a glass plate is hung and sandwiched and hung and is flat plate or bent, and a heat strengthening treatment is performed, a peculiar plate-shaped body is interposed on at least both surfaces of the glass plate on one side. By sandwiching it, there is almost no trouble such as breakage of the glass plate at the time of production, and there is almost no trace of the hanging tool on at least one side of the obtained bending or flat plate tempered glass plate, and it becomes almost flat and smooth. The other surface on the other side will have a dent that is almost invisible if treated with a primer, and the degree of strengthening will be almost uniform for the entire glass plate, and the breaking strength will be improved, and it can be provided to various fields. It is the one that can exhibit the physical properties of the product.

[Brief description of drawings]

1 shows an embodiment of the present invention. FIG. 1 is a side view of a method for manufacturing a tempered glass sheet of the present invention when a glass sheet is sandwiched and suspended by a hanging tool, and FIG. FIG. 3 shows (a) and (b) in which the sandwiching part of the figure is enlarged.
[FIG. 3] is a perspective view showing a plate-shaped body used in an embodiment of the present invention, and (c) and (d) are plate-shaped bodies of other examples that can be adopted in the present invention. 1 ... Lifting tool, 2 ... Glass plate, 3 ... Holding bolt, 4 ... Tip part, 5 ... Plate-like body, 6 ... Through hole

Claims (1)

[Claims] 1. In a heat treatment strengthening method of suspending a glass plate with a suspending tool, heating the glass plate to a strain point of the glass or higher, and then rapidly cooling the glass plate, between the front and back surfaces of the glass plate and both end portions of the suspending tool. At least one of which has at least a plurality of through holes penetrating the surface of the glass plate, and sandwiches the glass plate with a plate-like body having a surface roughness of 10 μm or less on the surface contacting the glass plate interposed therebetween. A method for manufacturing a tempered glass sheet, characterized by suspending and heat-treating.