JPH0747499B2 - Method and apparatus for cutting thick glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to the cutting of thick glass, and a thick glass plate having a thickness of, for example, 12 mm or more, which has been difficult to cut, is provided by applying a bending moment. The present invention relates to an extremely effective cutting method and apparatus for cutting.

INDUSTRIAL APPLICABILITY The present invention can be widely applied to glass articles such as architectural window glass for middle- and high-rise buildings, various interior materials, furniture furniture and the like.

(Prior Art) Conventionally, various methods have been used for cutting a glass plate, and after cutting a glass surface with a tip which is usually made of a diamond or cemented carbide tip, the glass plate is cut along this cut. A method for cutting and advancing a crack has been performed, and means for promoting the crack include, for example, JP-A-53-88817 and JP-B-53-23845,
A mechanical method of pressing to cause bending, Japanese Patent Publication No. 55-6584 and Japanese Patent Publication No. 57-55662,
Applying a bending moment after applying a cutting streak with a high pressure using a large foil tip etc., and as a cutting method utilizing thermal stress, for example, Japanese Patent Publication No. 55-29942 discloses a surface to be cut of a glass plate. In the above, an electric resistance wire having a predetermined cutting shape is installed, and then the electric resistance wire is energized to heat the surface to be cut to generate thermal stress in the cross section to be cut, and then the glass plate. By cooling one of the ends to be cut with a water droplet, a local crack is generated at the end of the glass plate, and a method of instantaneously cutting the glass plate by the development of cracks that occur is disclosed. And is known.

(Problems to be Solved by the Invention) As described above, in the cutting method in which the cutters of the conventional Japanese Patent Laid-Open No. 53-88817 and Japanese Patent Publication No. 53-23845 are used to make indents and bend, Thick eg 12mm
If it becomes the above thing, it is difficult to cut, and even if various auxiliary means are combined, engraving a cutter line on the surface of the glass plate does not necessarily cause a reliable and clean uneven chip or jaggedness, and does not deviate from the planned cutting line It is almost impossible to obtain a cutting edge or a cutting surface such as cutting, and for example, it is difficult to obtain a cutting surface perpendicular to the front and back surfaces of glass.

In the methods of JP-B-55-6584 and JP-B-57-55662, for example, a large diameter of about 12 mm and at least about 150 °
With a cutting wheel having a blunt blade with a cutting angle of, a deep cut is made on the surface under relatively high pressure, and heat and / or bending moment is applied to propagate and cut the cut,
For example, there is a problem that jagged marks are easily attached to the cut surface after folding.

Furthermore, in the method described in Japanese Examined Patent Publication No. 55-29942, when the stress distribution in the glass is non-uniform, the cutting line is likely to deviate from its planned line, especially as the size of the glass plate increases, or unequal distribution. This tendency becomes greater with cutting.

In any method, especially in a thick glass plate, the smaller the cutting interval, and the more unequal the cutting interval of the glass to be cut, the more vertical and smooth the surface of the glass, It was difficult to obtain a clean cut surface without lowering the strength, and above all, it was difficult to obtain a clean cut surface with no deviation near the edge immediately after the start of cutting and immediately before the end of cutting.

(Means for Solving Problems) The present invention has been made in view of such problems in the related art, and in particular, a simple apparatus using a mechanical method for a glass plate having a thickness of 12 mm or more, which has been considered to be difficult so far. The present invention provides a method and apparatus for cutting a glass plate, which has a clean cut surface and is free from deviations from the planned cutting line such as horns and chips.

The present inventors have grasped the correlation between the bending moment and the cut surface condition in the method for cutting thick glass, and, for example, when the bending moment is applied too high, the cut surface perpendicular to the front and back surfaces in the latter half of the fold is the glass to be cut. To achieve the above object, focusing on taking a means to reduce the bending moment in the second half of the fold, because a step that tilts toward the small plate of the plate is generated, and if it is too low, it will tilt to the large plate in the first half of the fold. For this reason, for example, in a method of cutting a thick glass plate having a plate thickness of 12 mm or more with a cutter to give a cut line on a plate surface, a fulcrum that supports the cut line lower surface at one end of the glass plate, and the cut line. The initial bending moment is applied by abutting pressure on both sides and pushing down, and the bending moment is controlled to be gradually decreased while raising the fulcrum that supports the glass plate. How to cut the thick glass to be collected,
In a device for cutting a thick glass plate by providing a cutting line on a plate surface with a cutter, a support tool that comes into contact with the lower surface of the cutting line of the glass plate to serve as a support fulcrum, and both sides of the cutting line A tiltable pressing plate that abuts against one end of the glass plate, and presses the pressing plate downward to give an initial bending moment to the glass plate; There is provided a thick glass cutting device, comprising: a vertical movement unit that raises the holding member and the pressing plate that are held together.

(Operation) The method for cutting thick glass according to the present invention includes a bending moment due to a bending action by a fulcrum that presses both sides of a line having a cut line on one end surface of a glass plate, and supports the bottom surface of the cut line, and the glass. If the plate is lifted while supporting it at the fulcrum, the area of the glass plate to be cut that is supported at the point of action increases with the progress of the point of action of splitting, and the bending force due to its weight adds up, so Although it gradually increases, the bending moment is controlled by sequentially decreasing the initial bending action force due to the pressing force. It has a smooth and clean straight line with no jaggedness even in unequal cutting, and a cross section perpendicular to the front and back surfaces. You can get a clean cut.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing a main part of which a part is cut away in an embodiment of the present invention, and FIG. 2 is a perspective view of the whole assembly.

A glass plate 2 with a scoring line 1 on the surface by a cutter
Is placed on an air table (not shown) and cut into pieces by a cutting device 3 arranged at a corner of the table.

The main part of the cutting device is one that is suspended from a cylinder 5 that sits on an overhanging base at the upper end of a standing pillar 4 to a transmission member 7 that is screwed to the end of a hanging rod 6. On the side surface, the upper part rises in a semi-circular shape via L-shaped support plates 8 and 8 ', and a support tool 9 having hard rubber adhered on its surface is axially fixed by a pin 10 so that the support tool and the transmission member 7 are attached. The sandwiched support plates 8 and 8'are rotatable about a pin 10.

Protruding mounting plates 11 and 11 'are fixed to the respective supporting plates 8 and 8', and pressing plates 12 and 12 'which are vertically movable by manually turning a screw rod screwed into a screw hole substantially at the center of the mounting plate. The board is provided with a lower surface of the board which is pressed against the glass plate 2 so as not to be scratched, such as a hard rubber plate, and is connected to the screw rod by a tiltable spherical seat.

Below the support plate 8, a connecting plate 13 fixed with bolts and nuts
Similarly, one support plate 8'is likewise hung in two parts, and the connecting plates 14 and 14 'whose lower end side is bent are screwed integrally, but the cylinder 15 is attached to the bent lower ends of the connecting plates 14 and 14'. It is tiltably supported by bolts 16.

The end of the rod 17 of the cylinder has a connecting member 18 forming a recess.
When the connecting plate 13 hanging from the support plate 8 is inserted into the inside of the recess and connected by the pin 19, the operation by the withdrawal of the rod 17 is performed by the pin 10 via the connecting plates 13, 14, 14 '. Interlocking with the tilting of the support plates 8 and 8 ′ about the axis, the cylinder 15, the support tool 9 and the like including the support plates are vertically moved together by the operation of the cylinder 5.

The operation of the present invention will be described below.

The glass plate 2 provided with the scoring line 1 on its surface on an air table (not shown) impacts the lower surface of the starting portion of the scoring line 1 in advance, and is commonly referred to as the central part of the V-shaped cutting line. Insert a vertical split called "new", put the lower surface of one end of the cut line on the support 9 in advance, and sandwich the cut line 1 while turning the handles provided at the ends of the screw rods 20 and 20 '. Then, the pressing plates 12 and 12 'arranged in step 2 are lowered and brought into contact with the surface of the glass plate 2.

Subsequently, when the rod 17 is contracted to a predetermined position by the operation of the cylinder 15, the supporting plates 8 and 8'tilt about the pin 10 as an axis, and are suspended via the mounting plates 11 and 11 'fixed to the supporting plates 8 and 8'. The pressing plates 12, 12 ′ in a hanging shape receive a pressing force substantially downward, and give a bending effect to the glass plate 2 on the support 9.

Operation of Cylinder 15 After that, when the cylinder 5 seated on the upper end of the column 4 is operated and the rod 6 is contracted to a predetermined height, the support member 9 that abuts the back surface of one end of the glass plate 2
And the pressing plates 12 and 12 'for pressing on the plate surface ascend while holding one end thereof, and the other end side of the glass plate to be split is supported on the air table and a new line along the cut line. Progresses and the fold breaking point moves sequentially along the slope.

When the glass plate 2 is lifted by the operation of the cylinder 5, the cylinder 15 is again operated by a switch (not shown) incorporated in the sequence, and the rod 17 is pushed out to support the support plate 8.
When 8'is interlocked and the bending action given at the beginning is reduced and the breaking action is continued, a clean cut surface without a step can be obtained over the entire length of the cut surface.

For the operation of the cylinder 15, for example, if an electropneumatic converter or the like is used, the pressure during pressing can be linearly decreased within a set time by a rising start signal of the cylinder 5.

The support 9 which is set so as to be directly below the score line 1 and which abuts against the back surface of the glass plate 2 suppresses the opening of the glass plate that occurs at the time of splitting, and therefore the glass is supported by the tensile stress acting at right angles to the cut surface. It also prevents the generation of thin, sharp protrusions that differ from the steps formed along the back surface.

An example will be described below.

Example 1 Glass plate thickness 12 mm, cutting length 2500 mm, cutting width 100 mm, initial bending moment 280 kg-cm, speed for reducing bending moment 280 → 0 kg-cm / 10 seconds, 3 pieces were cut under the above conditions and all The entire length of the cut surface of the piece showed a clean cut.

Example 2 Glass plate thickness 15 mm, cutting length 2500 mm, cutting width 100 mm, initial bending moment 360 kg-cm, speed for reducing bending moment 360 → cut under each condition of 0 kg-cm / 20, 10, 7, 5 seconds However, the entire length of the cut surface showed a clean cut except for one point where the reduction speed was 5 seconds. One point with a decreasing speed of 5 seconds was an uncut point after the cutting length of 2000 mm.

It is clear from the above-mentioned example of the uncut portion that the bending moment is obviously controlled by the contraction of the cylinder 15 during cutting.

Here, the lifting distance of the support tool 9, that is, the lifting amount of the glass plate 2, is such that the stroke of the rod 6 is 200 mm and the lifting speed is 20.
It is set to ~ 30mm / sec, but 40mm except the above 1 point
The entire length is cut at the front and rear height positions.

If the thickness of the glass plate is thin or the cutting length is short, a clean cut can be obtained by simply applying a bending moment and lifting the glass plate.However, if the thickness is further increased, the bending force in the initial stage is increased and the reduction speed is reduced. Set to 10 to 20 seconds.

(Effects of the Invention) According to the present invention, regarding the cutting of thick glass, particularly a glass plate having a thickness of 12 mm or more, by gradually reducing the bending moment initially applied by a simple device, it is possible to bend the latter half of the fold. By adjusting the acting force, even in non-uniform cutting, a clean cut can be obtained reliably along the cutting line of the cutter and without any step or protrusion on the cutting surface.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a perspective view showing a main part of a cutting device, a part of which is cut away, and FIG. 2 is an overall assembly perspective view. 1 ... Cutting line, 2 ... Glass plate 3 ... Cutting device, 5,15 ... Cylinder 9 ... Supporting device, 12, 12 '... Pressing plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-53-88817 (JP, A) Actually opened 62-37050 (JP, U) Actually opened 58-65329 (JP, U) JP-B 57- 55662 (JP, B2)

Claims (2)

[Claims] 1. A method for cutting a glass plate having a large plate thickness with a cutter to give a cut line on the plate surface, and a fulcrum for supporting the cut line lower surface at one end of the glass plate and both sides of the cut line. A method of cutting thick glass, characterized in that an initial bending moment is applied by abutting against and pushing down the glass plate, and the bending moment is controlled to be gradually decreased while raising a fulcrum supporting the glass plate. 2. An apparatus for cutting a thick glass plate by providing a cutting line on a plate surface with a cutter, and a support tool which comes into contact with a lower surface of the cutting line of the glass plate and serves as a support fulcrum, An adjustable pressing means that holds one end of the glass plate with a tiltable pressing plate that abuts on both sides of the cut line, and presses the pressing plate downward to give an initial bending moment to the glass plate. An apparatus for cutting a thick glass plate, comprising: a vertical movement means for integrally raising the support tool holding the glass plate and the pressing plate.