JP2003261345A - Method for cracking rigid brittle plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and sure method which cracks a rigid brittle plate, such as a glass plate, by driving a cutter to travel on the surface of the rigid brittle plate while maintaining the pressurized contact therewith and makes the cracking of the rigid brittle plate possible only by the scribing process step in a method for cracking the rigid brittle plate. <P>SOLUTION: The segment to exist under the traveling line of a cutter of a table is provided with a belt-like projecting part 17, by which an upwardly projecting bend having the traveling section of the cutter as its ridge 18 is produced in the rigid brittle plate fixed on the table and in this state the cutter is made to travel. The projecting part 17 is formed to a thin strip or grid form and when the rigid brittle plate is to be cracked at a plurality of points or longitudinally and transversely, a grid sheet is fixed onto the table and the rigid brittle plate is attracted and fixed to the table surface between the cleats of the grid sheet. The method of attaching a tacky adhesive tape to the table surface is convenient for fabrication of a smaller number of lots. While the height of the projecting part 17 varies with the nature of the rigid brittle plate to be cracked, the height is about 0.1 to 1 mm in the case of the glass plate used for a liquid crystal substrate, etc. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard brittle plate typified by a glass plate which is run along a desired breaking line while pressing a pointed needle or roller blade (hereinafter referred to as "cutter") against the surface. , A method for cleaving a hard brittle plate by utilizing vertical cracks generated along the strike line.

[0002]

2. Description of the Related Art A diamond cutter is pressed against the surface of a hard and brittle plate such as a glass plate or a ceramic plate to run it, thereby forming a groove (scribe groove) on the surface of the brittle plate and then impacting the brittle plate. A method of breaking a hard brittle plate along the groove by applying bending stress or bending stress is known. In such a conventional method, a step of forming a groove in the hard brittle plate is called a scribing step, and a step of applying impact or bending stress to divide the brittle plate along the groove is called a break step. The break process is generally carried out by colliding an elongated member (break blade) in the direction along the groove from the back side of the grooved surface with the hard brittle plate, or by applying bending stress to the hard brittle plate along the scribe groove. Has been done.

That is, in order to cut a hard brittle plate of this kind, two steps of a scribe step and a break step are required. Therefore, two types of devices, a device for performing a scribing process and a device for performing a break process, are required for the cutting of one hard and brittle plate, and depending on the structure of the device, the hard and brittle plate may be interposed between the two devices. It is necessary to turn the inside out.

A glass plate used for manufacturing a display panel or the like tends to have a large area and a thin plate. Therefore, the apparatus becomes large in size, a large installation area is required, and it becomes difficult to invert a thin and large-sized glass plate from the front side to the other side.

In a liquid crystal display panel or the like, two glass plates are combined so that a scribing process and a breaking process are required for each of the two glass plates.
Four steps are required to cut a glass substrate.

If the glass plate can be cut only by the scribing process, a large-scale break device becomes unnecessary, the device cost and the device installation area can be reduced, and the productivity can be improved by reducing the process. Further, like a display substrate, the occurrence of defective products in the cutting of two glass plates stacked can be significantly reduced.

When the scribe groove is engraved, vertical cracks that propagate in the thickness direction and horizontal cracks that propagate in the surface direction are generated in the glass plate. If the vertical crack can be deepened, the glass plate can be cut with a light impact.
When the cutter is pressed against the glass plate with a strong force, the vertical cracks become deeper, but the horizontal cracks also become larger, resulting in chipping or cracking on the fractured surface. Moreover, there is a limit to the depth of the vertical crack, and there is a limit that the depth of the vertical crack does not become deeper even if the pressing force is increased.

In order to deepen the vertical cracks due to the engraving of the scribe groove, it is preferable to use a roller blade having a small diameter as a cutter, that the peripheral surface of the roller blade is sawtooth-shaped, It is known to be good to use thin, sharp roller blades.

However, since the roller blade needs to roll on the surface of the glass plate, and therefore involves a shaft support structure, there is a limit to reducing the diameter of the roller blade. The diameter of the roller blade currently in practical use is 2-3 mm. In addition, the method of making the blade edge of the roller into a saw blade shape or thinning the blade edge has the drawback that the strength of the blade edge is weakened, the direction of the blade edge is not stable, and the wear of the blade edge increases, in addition to cutting Occasionally, the amount of glass powder generated increases, and there is a problem that the glass powder adheres to the pattern surface and wears the bearing portion of the roller.

Therefore, a technique has been proposed in which a vertical crack is deepened by engraving a scribe groove while applying vibration to the cutter. For example, Japanese Patent Laid-Open No. 11-157860 discloses a technique for applying vibration using an electric exciter.
There is one disclosed in the publication. The method of making the blade edge of the roller blade into a saw blade shape as described above can also be said to be a technique of applying a vibrating pressing force to the glass plate surface.

[0011]

However, when a high-frequency vibration that makes the break step unnecessary is applied to the cutter, the support portion of the holder holding the scribe blade and the bearing portion of the roller blade are damaged, There arises a problem that the device cannot have sufficient durability. Further, the method of forming the blade edge of the roller blade into a saw blade shape also has the above-mentioned problems.

The present invention solves these problems,
The object is to obtain a simple and reliable method that enables the breaking of hard brittle plates only by the scribing process.

[0013]

In the method of cleaving a hard brittle plate according to the present invention, which solves the above-mentioned problems, a sharp needle or a roller blade 6 is pressed against the surface of the hard brittle plate 1 fixed on a table 3 for running. Thereby, in the method of cleaving the hard brittle plate along the traveling line, the rigid brittle plate fixed on the table by providing the strip-shaped protrusions 17 in the portion below the traveling line of the table. The pointed needle or the roller blade is made to run in a state where the brittle plate is bent upward with the running portion as the ridge portion 18.

The strip-shaped protrusions 17 are thin strips or grids, and when splitting at a plurality of locations or in the vertical and horizontal directions, a grid sheet formed with crosspieces at center intervals equal to the splitting intervals is fixed on the table and the grid is formed. By adhering and fixing the hard brittle plate to the table surface at a position between the crosspieces of the sheet, workability of the setup work can be improved.

In order to provide the strip-shaped protrusions on the table, in addition to the method of directly processing the table surface to form the strip-shaped protrusions, a method of sticking an adhesive tape on the table surface, It is possible to use a method in which a thin sheet that has been punched out leaving the remaining portion is placed on the table surface. The method of directly processing the table surface is convenient when processing a large number of glass plates of the same size, and the method of attaching the adhesive tape to the table surface is convenient when processing a small number of lots. The height and width (especially height) of the strip-shaped protrusions 17 should be constant. Therefore, when the hard brittle plate is cut along a plurality of split lines that intersect in the vertical and horizontal directions, the strip-shaped protrusions 17 also have a grid shape. Must be installed in. In such a case, it is convenient to adopt a method in which a thin metal sheet punched out in a grid pattern is fixed on the table surface. Strip protrusion 17
The height depends on the properties of the hard brittle plate to be cleaved, but in the case of a glass plate used as a liquid crystal substrate or the like, it is about 0.1 to 1 mm.

[0016]

1 is a view showing an example of a cleaving device used in the method of the present invention. In the figure, reference numeral 3 is a table of the cleaving device, which is movable in the left-right direction in the figure and positionable, and is rotatable around a table center as a center in the vertical direction (vertical direction in the figure). The glass plate 1 to be cleaved is placed on the table by vacuum suction. Reference numeral 2 is a traveling guide mounted in parallel with the upper surface of the table 3 and extending in a direction perpendicular to the plane of the drawing, and 4 is a ball screw mounted in parallel with the traveling guide 2 and rotationally driven by a traveling motor (not shown). Reference numeral 5 denotes a traveling table on which a cutter (roller blade) 6 travels, which is movably mounted on the traveling guide 2 in a direction perpendicular to the plane of the drawing and is screwed onto the ball screw 4. Reference numeral 7 denotes a lifting screw that is vertically supported by the traveling table 5 and is rotationally driven in the forward and reverse directions by the servo motor 8. Reference numeral 9 denotes an elevating table which is guided by the traveling table 5 so as to be vertically movable and is screwed into the elevating screw 7. The lifting table 9 includes a pressure cylinder 10 indicated by a dotted line in the figure.
Are separated from each other in the direction perpendicular to the paper surface of the drawing, and the cutter head 12 is fixed to the two rams 11 urged downward by the pressure cylinder. The two rams 11 are provided to prevent the cutter head 12 from rotating around the vertical axis. Reference numeral 13 denotes a swing shaft that is swingably supported by the cutter head 12 about a vertical axis. The swing shaft 13 is biased to the lower end of the swing shaft in the trailing direction (the dragging direction) so that the cutter 6 is supported in a freely rotating state. Has been done.

Air pressure is supplied to the pressure cylinder 10 at the top and the peripheral surface of the ram 11. Due to the air pressure supplied to the peripheral surface, the ram 11 is supported by the static pressure in a floating state in the pressure cylinder, and the cutter 6 smoothly moves up and down according to small irregularities on the glass surface. Air pressure is supplied to the top of the ram 11 via a pressure setter 15, and the pressure setter 15 and the servo motor 8 are controlled by a controller 16.

FIG. 2 is a schematic enlarged view showing a cut portion of the glass plate placed on the table 3. A tape-like tape is attached to the upper surface of the table 3 to form a band-shaped protrusion 17 extending in a direction perpendicular to the plane of the drawing. Tape 1
7 is formed by stacking and adhering a plurality of thin adhesive tapes made of synthetic resin, or by fixing a thin metal strip plate on the table surface. Although not shown in the drawing, a large number of holes for vacuum suction are formed on the table surface, and the glass plate 1 is sucked and fixed on the table 3 by the vacuum pressure acting on the holes. Fixed glass plate 1
Bends upward at the position where the strip-shaped protrusion 17 is provided, as shown exaggeratedly in FIG. The amount of bending can be adjusted by the height and width of the strip-shaped protrusion 17, the distribution of holes on the table surface, and the vacuum pressure applied thereto. Deflection top (ridge) 18
Is a running line (cutting line) of the cutter 6 at the center of the strip-shaped protrusion 17.
Located in the running part of. The thickness T of the strip-shaped protrusion 17 is preferably 0.15 to 0.4 mm, and the width B is preferably 10 to 20 mm. Therefore, this bending of the glass plate is almost invisible.

According to an experiment using a single glass plate, a value obtained by dividing the bending height H of the glass plate when the band-shaped protrusion 17 is provided by the bending width W is 0.002 to 0. .004
Of the strip-shaped projections 1 having a height H / W of about 0.0029 to 0.0035.
When 7 was provided, good breakless cleaving was possible only by running the cutter 6. In the experiment using the glass single plate, when the height of the strip-shaped protrusion 17 is too high or too low, the value of H / W tends to decrease,
When the H / W is lowered, it tends to be difficult to perform breakless cleaving only by running the cutter 6. However, it is clear that the above-mentioned specific numerical values differ depending on the properties of the hard and brittle plate to be cleaved. For example, in the case of two glass plates, an adhesive that bonds two plates or two plates Due to the material of the seal that contains the liquid crystal between the glass plates of
The above values fluctuate greatly.

A plurality of strip-shaped projections 17 can be provided on the table 3 in accordance with the intervals of the severing lines of the glass plate 1, or only one at the position of the traveling line of the cutter blade 6 to provide the glass. By floating and moving the plate 1 with air, it is possible to perform cutting at a plurality of positions while the table is fixed.

Further, when the glass plate 1 is cut at a plurality of vertical and horizontal positions, the glass plate 1 can be cut in both the vertical and horizontal directions by the method of the present invention, but the scribe groove is formed by the conventional technique along the cutting line in the first direction. A cutting method in which a breaking line in a second direction intersecting with this is cut into a band-shaped glass plate by the method of the present invention, and then broken along the scribe groove in the first direction. May be convenient. Further, in the case of two laminated glass plates, the glass plate on one side is vertically and horizontally cleaved by the method of the present invention, and the first direction of the glass plate on the other side to be subsequently cleaved is scribed by a conventional method. And the second direction is cut by the method of the present invention to form a strip-shaped 2
It is convenient to use a cleaving method in which the glass plates are laminated together and then sequentially broken along the scribed grooves in the first direction.

Incidentally, the pressing force of the roller blade 6 against the glass plate 1, the cutting depth, the running speed, etc. may be almost the same as those when engraving the scribe groove on the glass plate in the conventional method, and therefore the existing method. The method of the present invention can be carried out only by providing the strip-shaped protrusions 17 on the table of the scribing device.

[0023]

According to the method of the present invention described above,
Breakless cleaving of hard brittle plates is possible with a simple device,
It is possible to significantly reduce the cost of the device, the installation area, and the number of cleaving steps required for cleaving the hard brittle plate, and realize cleaving without causing any problem in the mechanical life of the cleaving device.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a cleaving device used in the present invention.

FIG. 2 is an explanatory view exaggeratingly showing a state of a glass plate to be cut.

[Explanation of symbols]

1 glass plate 3 tables 6 cutters 17 Strip protrusion

Claims (4)

[Claims] 1. A hard brittle plate (1) fixed on a table (3).
By pressing the needle or roller blade (6) on the surface of the plate and running it, in the method of cleaving the hard brittle plate along the running line, the hard brittle plate is below the running line of the table. By providing a strip-shaped protrusion (17) on the part, the pointed needle or roller blade is produced in a state where the hard brittle plate fixed on the table is bent upward with the running line as the ridge (18). A method of cleaving a hard brittle plate, which is made to run. 2. The strip-shaped projection is a thin strip plate-shaped projection.
The method for cleaving a hard brittle plate according to claim 1. 3. A grid sheet formed with crosspieces at a center interval equal to the cutting interval of the hard brittle plate to be cut is fixed on a table, and the hard brittle plate is placed on the table surface at a position between the crosspieces of the grid sheet. The method for cleaving a hard and brittle plate according to claim 1, wherein the method is the adsorption and fixation. 4. The hard brittle plate is adsorbed and fixed on a table on which strip-shaped projections are formed at a center interval equal to the cleaving interval of the hard brittle plate to be cleaved on the table surface.
A method for cleaving a hard brittle plate as described.