JPH08277137A - Cutter for cutting glass plate - Google Patents

Abstract

PURPOSE: To obtain a cutter for cutting glass plate capable of easily forming a cutting line tilted against the depth direction on the surface of the glass plate by making blade parts in the left and right of a ridgeline and by constituting the left and right blades so as to form different blade angles. CONSTITUTION: This cutter 2 having such a solid shape that the base surfaces of two truncated cones having the same base surface and different heights are overlapped each other and formed by two planes 2a, 2b opposing each other and two curved surfaces 2c, 2d, is produced. And the cutter for cutting glass plate 2 is obtained by forming blade parts 5, 6 in the left and right of a ridgeline 4 formed by the edge parts of two curved surfaces 2c, 2d and by constituting these left and right blade parts so as to form different blade angles θ1 , θ2 against the ridgeline 4. And, in using the cutter 2, the cutter 2 is transferred as drawing a circle along with the surface of the glass plate 1 in the state of standing the ridgeline 4 vertically to the surface of the glass plate 1 to form a cutting line 3 tilted against the depth direction on its surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass plate cutting cutter for cutting a glass substrate for a magnetic disk or an optical disk from a glass plate.

[0002]

2. Description of the Related Art Conventionally, a glass plate cutting cutter for cutting a glass substrate for a magnetic disk or an optical disk from a glass plate is formed so that the left and right blade angles are equal to the ridgeline of the cutter.

[0003]

In cutting a glass plate with a conventional glass plate cutting cutter, a cut line is formed in a direction orthogonal to the glass plate. Therefore, it is necessary to cool the inner part with dry ice etc. to shrink it in order to extract the inner part surrounded by the closed curve even when the cut muscle reaches the facing surface. The process and special jigs are indispensable and complicated.

[0004]

In order to solve the above-mentioned problems, the present invention is a cutter for forming a cut line which is inclined with respect to the thickness direction of a glass plate on one surface side of the glass plate, and the cutter has a ridge line. The left and right blades are provided, and these left and right blades form different blade angles with respect to the ridgeline.

The cutter may be used with the ridge line set upright with respect to the glass plate surface.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a cross-sectional view of a glass plate with a cut line, FIG. 2 is an enlarged view of the cutter shown in FIG. 1, and FIG. 3 is a difference between the right and left edge angles of the cutter shown in FIG. It is a graph which shows the relationship with the inclination of. As an example, a case where a glass substrate for a magnetic recording medium is cut from a glass plate will be described.

As shown in FIG. 1, when the cut line 3 is formed on one surface of the glass plate 1 having a rectangular shape, a diamond disc saw 2 as a glass plate cutting cutter is used. As shown in FIG. 2, the diamond disc saw 2 has a three-dimensional shape in which two bottom surfaces of truncated cones having the same bottom surface and having different heights are overlapped with each other, and two flat surfaces 2a, 2b facing each other. And two curved surfaces 2c and 2d
Is formed from.

Blades 5 and 6 are formed on the left and right of the ridgeline 4 formed by the ends of the two curved surfaces 2c and 2d, and the angles of the blades 5 and 6 (the plane formed by the ridgeline 4). And the blade portions 5 and 6, that is, the curved surfaces 2c and 2d, which are also called blade angles) θ ₁ and θ ₂ are not the same but different (for example, θ ₁ <θ ₂ ).

The operation of the diamond disc saw 2 when forming the cut lines 3 on one side of the glass plate 1 will be described below. First, the diamond disc saw 2 is moved along the surface of the glass plate 1 with the ridge line 4 of the diamond disc saw ₂ having different angles θ ₁ and θ _{2 of} the blades 5 and 6 perpendicular to the surface of the glass plate 1. Move in a circular motion. Alternatively, the glass plate 1 may be rotated while fixing the position of the diamond disc saw 2. Then, the inclined cut lines 3 are formed in a circular shape on the surface of the glass plate 1.

FIG. 3 shows the difference between the angles θ ₁ and θ ₂ of the blades 5 and 6 (θ ₂ −θ ₁ ) and the inclination angle of the cut line 3 (the angle between the cut line 3 and the thickness direction of the glass plate 1). It is a graph showing the relationship with α,
From this graph, the cut line 3 is inclined toward the small angle θ ₁ , and the inclination angle α is further determined by the angle difference (θ ₂ −
It can be seen that it is approximately proportional to θ ₁ ).

If the cut lines 3 oblique to the thickness direction of the glass plate 1 are formed as described above, as shown in FIG.
The glass plate 1 is placed on the support base 7, and the heating member 8 heats the surface on which the cut lines 3 are formed and the outside of the region surrounded by the cut lines 3.

As described above, by heating the surface on which the score line 3 is formed, a difference in thermal expansion occurs in the thickness direction of the glass plate 1, and the glass plate 1 is deformed so as to be convex upward in the drawing. Due to this deformation, the cut lines 3 instantaneously reach the side opposite to the heating surface of the glass plate 1. In the above embodiment, the outer side 1a of the region surrounded by the cut line 3 is heated to ensure the advance of the cut line 3 in the thickness direction of the glass plate. However, the cut line 3 is formed. The entire surface may be heated.

After that, as shown in FIG. 5, a push rod 9 pushes the inside 1b of the region surrounded by the cut lines 3 to cut out a circle, and then the center of the cut glass plate is cut in the same manner. A donut-shaped glass substrate can be obtained by forming the holes.

[0014]

As described above, according to the present invention, since the blade angles provided on the left and right sides of the ridge line are different, the cutter and the glass plate are opposed to each other with the ridge line perpendicular to the glass plate surface. When the glass plate is moved in a horizontal direction, it is possible to easily form a diagonal cut line according to the angle difference of the blade angle in the thickness direction of the glass plate. Therefore, it is not necessary to cool the inner part with dry ice or the like to shrink it in order to extract the inner part surrounded by the cut lines, and a cooling process for dry ice or the like and a special jig are not required, which simplifies the process. Can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where a glass plate has a score line.

2 is an enlarged view of the cutter shown in FIG.

FIG. 3 is a graph showing the relationship between the difference between the right and left blade angles of the cutter shown in FIG. 2 and the inclination of the cut line.

FIG. 4 is a diagram showing a state where a glass plate is heated.

FIG. 5 is a diagram showing a state in which a portion surrounded by a cut line forming a closed curve is cut out.

[Explanation of symbols]

1 ... Glass plate, 2 ... Diamond disc saw (cutter), 3 ... Cut line, 4 ... Ridge line, 5, 6 ... Blade part, θ ₁ , θ ₂ ...
Angle of blade (blade angle).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 7/26 521 8721-5D G11B 7/26 521

Claims (2)

[Claims] 1. A cutter for forming a cut line on one surface side of a glass plate, the cut line being inclined with respect to the thickness direction of the glass plate, the cutter being provided with blade portions on the left and right sides of a ridge line, and the left and right blade portions thereof. Is a cutter for cutting a glass plate, which forms different blade angles with respect to the ridgeline. 2. The glass plate cutting cutter according to claim 1, wherein the cutter is used in a state in which the ridge line is set upright with respect to the glass plate surface.