JPS6065738A - Method for cutting flat glass - Google Patents

Abstract

PURPOSE:To prevent the occurrence of chips and waves, etc. in cut parts, by forming V-shaped grooves on both sides of a flat glass, and cutting the flat glass with a disk saw having a smaller width than the V-shaped grooves along the V- shaped grooves. CONSTITUTION:A grinder 14 is moved along a scheduled cutting lines on both sides of a sandwich glass or special thick sheet glass, e.g. sandwich glass 1 to form V-shaped grooves 15. A diamond disk saw 16 having a smaller thickness (l2) than that of a width (l1) of the V-shaped grooves 15 is used to cut the sandwich glass 1 along the upper and bottom V-shaped grooves 15 and 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting plate glass suitable for cutting laminated glass or extra-thick plate glass.

A method as shown in FIG. 1 has been conventionally used as a general method for cutting laminated glass. That is, as shown in Fig. 1A and 1, a cutting line 4 is formed on one of the glass plates 2 of the laminated glass plate 1 using a jig 3, and then the laminated glass plate 1 is turned over and the other plate glass 2 is cut as shown in Fig. 1. A cutting line 6 is also formed on the glass plate 5. Then, as shown in FIG. 1 and 2, the laminated glass plate 1 is bent to one side around the cutting lines 4 and 60, and the cutting line 40 is expanded, and the resin film 8 interposed between the glass plates 2 and 5 is cut with the cutter 7. I try to do that. There is also a method of cutting the resin film 8 by using flame instead of the cutter 7.

However, the laminated glass 1
In order to cut the film 8 with a cutter 7 or the like, it is necessary to bend the laminated glass 1 and widen the cutting line 40, but it is difficult to hold the laminated glass 1 bent at a predetermined angle. , especially laminated glass 10
If the dimensions are large, the range within which the cutter can be reached by hand is limited, resulting in poor workability, and it is difficult to perfectly match the cutting lines 4 and 6 formed on each sheet glass 2.5. Furthermore, when the laminated glass 1 is bent to widen the portion along one cutting line 4, the edges of the other cutting line 6 inevitably come into contact with each other, as shown in FIG.
A chipping 9 occurs along the entire length of the cutting line 6.

In addition, as shown in Figure 3, a diamond disk
There is also a method of cutting the laminated glass 1 at one time using the saw 10. However, when using this method, as shown in FIG. 4, nicks 9, 9 occur at the part where the disc saw 10 enters the laminated glass 1 and the part where the disc saw 10 exits from the laminated glass 1. If the speed of the disc saw 10 is reduced in order to prevent this, the operating efficiency will decrease and practicality will be lost.

Furthermore, as a method for cutting extra-thick plate glass, as shown in FIG. The extra-thick plate glass 11 is lightly struck from the back side to develop a score line 12, and then bent and cut as shown in FIG. 5C. However, when such a method is used, the cut surface does not become smooth, and undulations called so-called burrs occur.

As described above, according to the conventional cutting method, cutting is required. Since such secondary processing is performed, there is a problem in that the final dimensional accuracy is reduced.

The present invention has been made to improve the problems of the conventional cutting method as described above, and it is possible to efficiently cut laminated glass and extra-thick plate glass, and there is no occurrence of cracks or undulations in the cut portion. The present invention aims to provide a method for cutting plate glass that does not require post-processing and has excellent final dimensional accuracy.

Embodiments of the present invention will be described below with reference to FIGS. 6 to 9. Of these, FIGS. 6 to 8 show the first embodiment. First, as shown in FIG.
The grinder 14 is moved to form the groove 15.

Here, the grooves 15 may be formed on both sides of the glass plates 2 and 50 at the same time, or may be formed on each side one after another. Next, as shown in FIGS. 7 and 8, using a diamond disk 16 whose thickness 4 is thinner than the width t1 of the groove 150,
The laminated glass 1 is cut along the upper and lower V grooves 15 and 15. In this way, it is the same as if the ridge line between the surface of the glass plate 2.50 and the cut surface had been hemmed in advance, and in particular, in the manufacturing process of the glass plate 2.5, residual stress different from that in the deep part is generated. Since the existing surface layer is removed, no chipping occurs.

In addition, in the second embodiment shown in FIG. 9, the shafts 14a, 14a of the pair of upper and lower gliders 14, 14 and the shaft 16a of the diamond disc 16 are supported on a support, etc. By moving in the direction of the middle arrow, the formation of grooves 15 and 15 on both sides of the glass plates 2 and 5 and the cutting by the diamond disc 16 are performed continuously and simultaneously. By doing this, the occurrence of chipping, waviness, etc. can be prevented, and work efficiency can be greatly improved.

Although the illustrated example shows an example in which laminated glass is cut, extra-thick plate glass can also be cut in a similar manner.

As explained above, according to the present invention, grooves are formed on both sides of laminated glass or special thick plate glass, and then
Using a disc saw that is smaller than the width of the groove, the cut is made along the groove, so there is no chipping or waviness in the cut area, and post-processing such as thread chamfering and grinding is not required. Since no post-processing is required, final dimensional accuracy can be improved. Furthermore, compared to conventional methods, it has many effects such as improved work efficiency and the ability to write on a larger scale.

[Brief explanation of drawings]

Figure 1 A to E are side views showing an example of the conventional method of cutting laminated glass, Figure 2 is an enlarged side view of the cut portion when cutting by the method shown in Figures 1 and 3, and Figure 3 is a side view of the laminated glass. FIG. 4 is an enlarged side view of the cut portion when cutting by the method shown in FIG. 3, and FIGS. FIG. 6 is a side view showing an example of the conventional method; FIG. 6 is a perspective view showing the groove forming step in the method of the present invention; FIG. 7 is a perspective view showing the cutting step with a disc saw in the method of the present invention; FIG. 9 is a sectional view showing a cutting process using the disc saw, and FIG. 9 is a perspective view showing another embodiment of the present invention. In addition, in the drawing, 1 is a laminated glass, 2 and 5 are glass plates constituting the laminated glass, 4, 6, and 12 are cutting lines, 11 is a special thick plate glass, 14 is a grinder, 15 is a groove, and 16 is a diamond disc saw. be. Patent Applicant Nippon Sheet Glass Co., Ltd. Agent Patent Attorney 2 1) Volume Patent Attorney Kuni Ohashi Production Volume Patent Attorney Yu Koyama

Claims (1)

[Claims] Groove processing is performed on both sides of a plate glass such as laminated glass or extra-thick plate glass along the cutting line, and then cut along the groove using a disc saw whose thickness is thinner than the width of the groove. A method for cutting plate glass characterized by the following.