JP2009143774A - Glass sheet cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass sheet cutting method which can use a conventional cutter without necessitating any specially shaped cutter and is excellent also in workability. <P>SOLUTION: A glass sheet 100 is mounted on the spherical glass sheet mount surface 2 of a glass suction and support table 1, the glass sheet 100 is attracted and sucked on the glass sheet mount surface 2 by vacuum-drawing the glass sheet suction and support table 1 to elastically deform the glass sheet 100 into a spherical surface, a cut line 101 is formed on the surface of the glass sheet 100 with a cutter 10 so as to draw a closed curve, the glass sheet 100 is then removed from the table 1, the glass sheet 100 is restored into the original flat sheet, its surface with the slanted cut line is heated to deform the glass sheet 100, this deformation allows the cut line 101 to propagate in the direction of the thickness of the glass sheet till it reaches the opposite surface, and the part confined by the closed curve is separated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technology for manufacturing a disk-shaped or donut-shaped glass substrate by cutting a glass material that is formed into a square-cut plate shape, and more particularly to a doughnut-shaped glass substrate (glass disk) for a magnetic disk or optical disk. It is related with the cutting method of the glass plate used suitably for cutting out from a plate.

  Conventionally, a glass disk for a magnetic disk or an optical disk, that is, a glass disk, is manufactured by cutting a square-cut plate-like glass plate along the outer peripheral line and inner peripheral line of the disk with a cutter.

  To explain further, for example, as described in Patent Documents 1 and 2, a cut line is formed in the thickness direction of the glass plate by a cutter on one side of the glass plate, and then this cut line is attached. The glass plate is deformed by heating the heated surface, and this deformation causes the scissors to instantaneously reach the side surface opposite to the heating surface of the glass plate.

Then, it cuts out circularly by pushing the inside of the area | region enclosed by a cut line with a push rod. Subsequently, a donut-shaped glass substrate, that is, a glass disc is produced by forming a hole in the same manner at the center of the glass plate cut into a circle.
JP-A-7-223828 JP-A-8-277137

  However, in the method for cutting a glass plate described in Patent Documents 1 and 2 above, in particular, in order to form a cut line inclined with respect to the thickness direction of the glass plate on one surface side of the glass plate, blade portions on the left and right sides of the ridge line And the blade portion uses a cutter for cutting a glass plate so as to form different blade angles with respect to the ridgeline.

  Further, in Patent Documents 1 and 2, when using a cutter having the same blade angle with respect to the ridge line, a cut line is formed in a state where the ridge line of the cutter is inclined with respect to the surface of the glass plate. It is also disclosed.

  A cutter having a different blade angle with respect to the ridge line is difficult to manufacture, and the cost is high. In addition, forming the cut line with the ridge line of the cutter inclined with respect to the surface of the glass plate is problematic in terms of workability.

  Therefore, an object of the present invention is to provide a method for cutting a glass plate that does not require a cutter having a special shape, can use a conventional cutter, and is excellent in terms of workability.

The above object is achieved by the method for cutting a glass plate according to the present invention. In summary, the present invention
Installed a glass plate adsorption support plate with a glass plate mounting surface to be spherical,
Place a glass plate on the spherical glass plate placement surface of the glass plate adsorption support plate,
By vacuuming the glass plate adsorption support plate, the glass plate is sucked and adsorbed onto the glass plate mounting surface, and the glass plate is elastically deformed into a spherical shape,
By forming a cut line so as to draw a closed curve on the surface of the glass plate by a cutter disposed on the outer surface side of the glass plate,
Stop evacuation to the glass plate adsorption support plate, remove the glass plate from the glass plate adsorption support plate, and return the glass plate to the original flat plate shape, whereby the cut line is the thickness of the glass plate It becomes a state inclined with respect to the direction,
Next, the glass plate is deformed by heating the surface with the inclined cut lines, and the cut lines are advanced in the thickness direction of the glass plate by this deformation to reach the opposing surface,
After this, the part surrounded by the closed curve is separated,
This is a method for cutting a glass plate.

  According to one embodiment of the present invention, the heating of the cut surface of the glass plate is a portion outside the closed curve with the cut line.

  According to another embodiment of the present invention, the cutter has the same left and right blade angles with respect to the cutter ridgeline.

  According to another embodiment of the present invention, the cutter is erected in a state where the cutter ridge line is perpendicular to a plane that is in contact with the center of the spherical surface of the glass plate adsorbed on the glass plate adsorption support plate. The incision is formed by moving relative to the glass plate.

  The method for cutting a glass plate of the present invention does not require a specially shaped cutter, can use a conventional cutter, and is excellent in terms of cost and workability.

  Hereinafter, the glass plate cutting method according to the present invention will be described in more detail with reference to the drawings.

Example 1
First, referring to FIG. 1, the outline of the method for cutting a glass plate according to the present invention will be described. A cut line 101 is closed in the thickness direction of the glass plate by a cutter on one side of the glass plate 100 having a square shape. Form as you draw. When a glass disk for a magnetic disk or an optical disk, that is, a glass disk is produced, the closed curve is circular.

  Next, the glass plate 100 is deformed by heating the surface with the cut line 101, and the cut line 101 instantaneously reaches the side surface opposite to the heated surface of the glass plate 100 by this deformation.

  Then, it cuts out circularly by pushing the inner side of the area | region enclosed by the cut line 101 with a push rod. Subsequently, a donut-shaped glass substrate, that is, a glass disc 103 is manufactured by forming a hole in the same manner in the center of the glass plate 102 cut into a circle.

Next, with reference to FIGS. 2-4, one Example of the cutting method of the glass plate which concerns on this invention is described.
In this embodiment, a rectangular glass plate 100 is placed on a glass plate adsorption support board 1 having a spherical surface on one side 2.

  The glass plate 100 has a side length (W) of about 10 cm when a doughnut-shaped glass substrate (glass disk) for a magnetic disk or an optical disk is manufactured. Moreover, the thickness (T) of the glass plate 100 shall be 0.2-3.0 mm.

  In the glass plate adsorption support plate 1 in which the glass plate placement surface 2 is spherical, the size of the glass plate placement surface 2 is such a size that the glass plate 100 can be placed. In FIG. 2, which is a plan view of the suction support plate, a circular shape with a radial length (R) of 60 mm from the center O was formed. Further, as shown in FIG. 1 which is a cross-sectional view of the glass plate adsorption support plate 1, the outer peripheral edge 2a of the spherical surface 2 has a radial length (R) from the center O in this embodiment. At a position of 60 mm, a spherical shape is displaced in the vertical direction downward by a distance (ΔE) = 0.3 mm. The degree of the spherical surface of the spherical surface 2a of the glass plate adsorption support plate 1 is not limited to the above-mentioned dimensions of the present embodiment, and is appropriately determined depending on the properties of the glass plate to be processed, dimensions, shapes, and the like. The

  Further, as shown in FIG. 3, the glass plate mounting surface 2a having a spherical shape has a predetermined interval from the spherical support plate center O along the spherical surface, for example, an interval of 5 to 15 mm in the radial direction. Thus, concentric annular grooves 3 (3a, 3b, 3c) are formed. In this embodiment, three concave grooves 3 are shown in FIG. 3, but the present invention is not limited to this.

  The concave groove 3 is a square groove having a cross-sectional shape of width 3 mm × depth 1 mm, and the outermost concave groove 3 c is provided with an elastic sealing member, for example, an O-ring 5. As the O-ring 6, a 0-ring having a diameter of 1 to 3 mm is usually attached. The concave grooves 3a and 3b closer to the center than the O-ring groove 3c are suction grooves, and are connected to the vacuum device 6 via suction holes 4a and 4b formed in the bottoms thereof.

  According to the present embodiment, first, as shown in FIG. 2A, the glass plate 100 is placed on the glass plate placement surface 2 of the glass plate adsorption support board 1 having a spherical shape. The glass plate 100 is carried by an O-ring 5 provided on the outer periphery of the glass plate placement surface 2.

  Next, when the vacuum device 6 is activated, the glass plate 100 is sucked (evacuated) toward the glass mounting surface against the elastic force of the O-ring 5 as shown in FIG. It is adsorbed on the spherical surface 2 of the plate adsorption support plate 1. That is, the glass plate 100 is elastically deformed from a flat plate shape to a spherical shape.

  According to the present invention, a roller cutter 10 that is a cutter, that is, a diamond disc saw or the like uses a cutter that has the same left and right blade angles with respect to the cutter ridge line 11 as shown in FIG. be able to. Of course, the use of a cutter having different left and right blade angles with respect to the cutter ridge line 11 is not prohibited.

  Further, the cutter 10 is held in a state in which the ridge line 11 is arranged in the vertical direction. That is, the cutter 11 is held in a state in which the cutter ridge line 11 stands vertically with respect to the plane H that is in contact with the center Og of the spherical surface of the glass plate 100 adsorbed on the glass plate adsorption support board 1.

  Next, according to the present embodiment, as shown in FIG. 2 (c), in this state, a closed curve is moved along the surface of the glass plate. The glass plate is moved with the position fixed. That is, the cutter 10 is moved relative to the glass plate 100. As a result, a circular cut line 101 is formed on the surface of the glass plate. The cut line 101 is formed in a spherical glass plate 100 substantially perpendicular to the thickness direction of the glass plate 100. Of course, the cut line 101 may be inclined to the outer peripheral side with respect to the thickness direction of the glass plate.

  Thereafter, the operation of the vacuum device 6 is stopped, and the suction state of the glass plate 100 to the glass plate suction support board 1 is released. Thereby, the glass plate 100 returns to flat form. Further, as shown in FIG. 2 (d), the cut line 101 formed on the glass plate 100 is an outer periphery of the glass plate 100 with respect to the thickness direction of the glass plate 100 in the glass plate 100 returned to a flat plate shape. The cut line 101 is inclined to the side.

  Next, as described in Patent Document 1 described above, the glass plate 100 is heated on the surface with the cut lines 101 as shown in FIG.

  Thus, by heating the surface on which the cut line 101 is formed, thermal expansion occurs in the thickness direction of the glass plate 1, and the glass plate 100 is deformed so that the surface on which the cut line 101 is formed becomes convex. The cut line 101 instantaneously reaches the side opposite to the heating surface of the glass plate 100. At this time, it is preferable that the surface of the glass plate 100 with the cut line 101 is heated outside the closed curve with the cut line 101. This ensures the progress of the cut line 101 in the glass plate thickness direction. Of course, the surface on which the cut line 101 is formed may be heated entirely.

  Then, it can cut out circularly by pushing the inside of the area | region enclosed by the cut line 101 with the push rod 200. FIG. That is, a circular glass plate 102 is produced.

  Further, as shown in FIG. 1, a donut-shaped glass substrate, that is, a glass disc 103, can be produced by forming a hole 104 in the center of the glass plate 102 cut into a circle in the same manner as described above. it can.

  In the above embodiment, the circular or doughnut-shaped glass disk has been described. However, the shape to be cut out is not limited to a circular shape, and may be a shape surrounded by a closed curve such as an ellipse or a square.

  As described above, according to the present invention, a cutter having a special shape is not necessarily required, and a conventional cutter can be used, which is excellent in terms of cost and workability.

It is a figure explaining the general | schematic process until producing the circular or doughnut-shaped glass disc from a square-shaped glass plate according to this invention. It is process drawing explaining the cutting method of the glass plate which concerns on this invention. It is a top view of a glass plate adsorption | suction support disk. It is a figure explaining the process of cutting out a glass disc from the glass plate in which the cut line was formed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass plate adsorption | suction support plate 2 Spherical glass plate mounting surface 3a, 3b Suction groove 3c O ring groove 5 O ring 6 Vacuum apparatus 10 Cutter 11 Cutter ridgeline 100 Glass plate 101 Cutting line 102, 103 Glass disk

Claims (4)

Installed a glass plate adsorption support plate with a glass plate mounting surface to be spherical,
Place a glass plate on the spherical glass plate placement surface of the glass plate adsorption support plate,
By vacuuming the glass plate adsorption support plate, the glass plate is sucked and adsorbed onto the glass plate mounting surface, and the glass plate is elastically deformed into a spherical shape,
By forming a cut line so as to draw a closed curve on the surface of the glass plate by a cutter disposed on the outer surface side of the glass plate,
Stop evacuation to the glass plate adsorption support plate, remove the glass plate from the glass plate adsorption support plate, and return the glass plate to the original flat plate shape, whereby the cut line is the thickness of the glass plate It becomes a state inclined with respect to the direction,
Next, the glass plate is deformed by heating the surface with the inclined cut lines, and the cut lines are advanced in the thickness direction of the glass plate by this deformation to reach the opposing surface,
After this, the part surrounded by the closed curve is separated,
A method for cutting a glass plate.   2. The method for cutting a glass plate according to claim 1, wherein the heating of the surface of the glass plate with the cut line is a portion outside the closed curve with the cut line.   The method for cutting a glass plate according to claim 1 or 2, wherein the cutter has the same edge angle on the left and right with respect to the ridge line of the cutter.   The cutter is moved relative to the glass plate in a state where the cutter ridge line stands upright with respect to a plane contacting the center of the spherical surface of the glass plate adsorbed by the glass plate adsorption support plate. 4. The method for cutting a glass sheet according to claim 3, wherein the cut line is formed.

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