CN108698903B

CN108698903B - Method for manufacturing plate-shaped glass

Info

Publication number: CN108698903B
Application number: CN201780015455.2A
Authority: CN
Inventors: 下津浩一; 高桥祐之; 野坂裕司; 奥村弘和; 和泉纯一; 伊吹真澄; 北川翔; 辻义隆; 折田宪明; 原口智幸
Original assignee: Nippon Electric Glass Co Ltd
Current assignee: Nippon Electric Glass Co Ltd
Priority date: 2016-06-29
Filing date: 2017-06-06
Publication date: 2022-03-08
Anticipated expiration: 2037-06-06
Also published as: WO2018003430A1; CN108698903A; KR20190025535A; JPWO2018003430A1; TW201800350A; KR102274706B1; JP6819025B2; TWI705046B

Abstract

A method for manufacturing plate-shaped glass forms a Scribing Line (SL) on a glass substrate (G) by moving a scribing tool (1) along a specified direction (X), and breaks the glass substrate (G) along the Scribing Line (SL). The scribing tool (1) is provided with a tool shank (2) and a cutter (3) arranged at the end part of the tool shank (2). The cutter (3) has a cutting point (4) for forming a Scribing Line (SL) on the glass substrate (G) by sliding on the surface of the glass substrate (G). The cutting point (4) is formed in an arc shape perpendicular to the predetermined direction (X).

Description

Method for manufacturing plate-shaped glass

Technical Field

The present invention relates to a method for manufacturing a plate glass having a predetermined shape by breaking a glass substrate.

Background

When plate-shaped glass for a Flat Panel Display (FPD) such as a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), or an organic EL display (OLED) is manufactured, a large glass substrate formed by a forming method such as a down-draw method is cut to form plate-shaped glass having a predetermined size. Specifically, for example, after forming a scribe line on a glass substrate using a scribing wheel, the glass substrate is broken along the scribe line to form a plate-shaped glass.

When a scribing line is formed on a glass substrate using a scribing wheel, a minute crack (transverse crack) extending in a direction parallel to the surface of a plate-shaped glass is formed at the time of forming the scribing line. When a plate-shaped glass is formed by breaking a glass substrate, a transverse crack remains in a cut surface (end surface) thereof. Since the transverse crack causes a reduction in the mechanical strength of the plate glass, the transverse crack is removed by chamfering (grinding) the end face of the plate glass. That is, in order to improve the mechanical strength of the plate glass, prevent breakage and chipping of the plate glass, and facilitate handling in the subsequent steps, grinding (chamfering) processing and polishing processing are performed on the end face of the plate glass (for example, see patent document 1).

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-136488

Disclosure of Invention

Problems to be solved by the invention

In the conventional method for manufacturing plate-shaped glass, when the glass substrate is cut, chamfering for removing the transverse crack formed on the end face is required, and therefore, the number of steps and time involved in the processing are increased. In order to produce plate-shaped glass more efficiently, it is desirable to cut the glass substrate so as not to cause transverse cracks in the cut surface of the plate-shaped glass, and to omit or simplify the grinding process.

Accordingly, an object of the present invention is to provide a method for manufacturing plate-shaped glass, which can cut a glass substrate without generating transverse cracks in a cut surface.

Means for solving the problems

The present invention has been made to solve the above-mentioned problems, and provides a method for manufacturing a plate-shaped glass, in which a cutting blade is moved in a predetermined direction to form a scribe line on a glass substrate and the glass substrate is broken along the scribe line, thereby manufacturing a plate-shaped glass having a predetermined shape, wherein the cutting blade has a cutting point that forms the scribe line on the glass substrate by sliding on a surface of the glass substrate, and the cutting point is formed in an arc shape orthogonal to the predetermined direction.

Thus, the scribing line can be formed on the glass substrate without generating excessive friction by forming the cutting point of the cutter into an arc shape. This makes it possible to cut the glass substrate without generating transverse cracks, and thus to omit or simplify the grinding of the cut surface of the plate-shaped glass. Therefore, high-quality plate glass can be efficiently produced.

In the above method, it is desirable that the cutter is detachably held by a cutter holder. In this case, it is desirable that the cutter holder holds the cutter so that an angle of the cutter with respect to the glass substrate can be changed. Further, it is desirable that the cutter is formed in a polygonal shape, and the cutting point is formed at a corner of the cutter. This makes it possible to form a plurality of cutting points on the cutter, and to use the cutter for a long period of time. Alternatively, it is desirable that the cutter is formed in a disc shape, and the cutting point is formed in a circular shape at an edge of the cutter.

The present invention has been made to solve the above-mentioned problems, and provides a method for manufacturing a plate-shaped glass, in which a scribing tool is moved in a predetermined direction to form a scribing line on a glass substrate and the glass substrate is broken along the scribing line to manufacture a plate-shaped glass having a predetermined shape, wherein the scribing tool includes a holder and a cutter provided at an end of the holder, the cutter includes a cutting point that slides on a surface of the glass substrate to form the scribing line on the glass substrate, and the cutting point is formed in an arc shape orthogonal to the predetermined direction.

Thus, the scribing line can be formed on the glass substrate without generating excessive friction by configuring the cutting point of the cutter provided at the end of the holder to be arc-shaped. This makes it possible to cut the glass substrate without generating transverse cracks, and thus to omit or simplify the grinding of the cut surface of the plate-shaped glass. Therefore, high-quality plate glass can be efficiently produced.

In this case, the cutting point may be configured as an arc-shaped edge portion, or the cutting point may be configured as a spherical surface including the arc.

Further, it is desirable that the radius of curvature of the cutting point is 0.001mm or more and 1mm or less. This enables glass substrates of various thicknesses to be cut appropriately.

In the method for producing a plate-shaped glass according to the present invention, the cutting blade may be formed in a truncated cone shape, and the cutting point may be formed in a circular shape at an edge portion of an axial end portion of the cutting blade.

In the present invention, "circular arc" includes a part of a circular shape. As described above, the cutting blade is formed in a truncated cone shape or a cylindrical shape, and thus the cutting point of the edge portion formed at the axial end portion thereof is formed in a circular shape. By forming the cutting point in a circular shape in this manner, the cutting point can be used a plurality of times. That is, when a portion of the cutting point configured in a circular shape is brought into contact with the glass substrate to form the scribing line and the portion is worn, the remaining portion of the circle that is not in contact with the glass substrate can be used as a new cutting point in contact with the glass substrate. This enables the cutter to be used for a long period of time.

In the case where the cutter is formed in the truncated cone shape as described above, the scribing line may be formed by rotating the cutter about the axis thereof while moving the scribing tool in the predetermined direction. Accordingly, the cutter can always form the scribing line while changing the cutting point, thereby realizing the long service life of the cutter.

In the method for producing a sheet glass of the present invention, the scribing tool may be arranged such that the cutter is inclined with respect to the glass substrate, and an inclination angle of the scribing tool may be changed. The cutting point of the cutter is gradually worn away during use, but a new cutting point can be formed on the cutter by the wear. In this case, in the present invention, the inclination angle of the holder is changed so that the scribing line can be formed on the glass substrate at a new cutting point. This enables the cutter to be used for a longer period of time.

Effects of the invention

According to the present invention, the glass substrate can be cut without generating a transverse crack in the cut surface.

Drawings

Fig. 1A is a side view for explaining a method of manufacturing a plate-like glass.

Fig. 1B is a side view for explaining a method of manufacturing a plate-like glass.

Fig. 1C is a side view for explaining a method of manufacturing a plate-like glass.

Fig. 2 is a perspective view of a scoring tool.

Fig. 3 is a top view of a scoring tool.

Fig. 4 is a schematic diagram for explaining the principle of generation of the scribing line.

Fig. 5A is a side view showing the progression of wear of the cutter in the scoring tool and the preferred method of use of the scoring tool therewith.

Fig. 5B is a side view showing the progression of wear of the cutter in the scoring tool and the preferred method of use of the scoring tool therewith.

Fig. 5C is a side view showing the progression of wear of the cutter in the scoring tool and the preferred method of use of the scoring tool therewith.

FIG. 6 is a side view showing a preferred method of use of the scoring tool.

Fig. 7 is a perspective view showing another example of the scribing tool.

Fig. 8 is a perspective view showing another example of the scribing tool.

Fig. 9 is a perspective view showing another example of the scribing tool.

Fig. 10 is a perspective view showing another example of the scribing tool.

Fig. 11 is a perspective view showing another example of the scribing tool.

Fig. 12 is a perspective view showing another example of the scribing tool.

Fig. 13 is a plan view showing a scribe line formed on a glass substrate.

Fig. 14 is a perspective view showing another example of the scribing tool.

Fig. 15 is a top view of the scoring tool shown in fig. 14.

Fig. 16 is a side view showing an example of the cutter holder.

Fig. 17 is a side view of the cutter holder.

Fig. 18A is a plan view of the cutter.

Fig. 18B is a plan view of the cutter.

Fig. 18C is a plan view of the cutter.

Fig. 18D is a plan view of the cutter.

Fig. 18E is a plan view of the cutter.

Fig. 19 is a side view for explaining a method of manufacturing a plate-like glass.

Fig. 20 is a front view of the cutter holder.

Fig. 21 is a front view of the cutter holder.

Fig. 22 is a front view of the cutter holder.

Fig. 23 is a side view showing another example of the cutter holder.

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Fig. 1 to 12 show one embodiment of the method for producing a plate glass of the present invention.

As shown in fig. 1, in the present method, a scribing tool 1 is brought into contact with a glass substrate G and linearly moved along a predetermined moving direction X, thereby forming a scribing line SL on the surface of the glass substrate G. Then, stress is applied to the glass substrate G to cause a crack to progress in the thickness direction from the scribe line SL, thereby cutting the glass substrate G into plate-shaped glass having a predetermined size.

The glass substrate G can be formed by various forming methods such as a known float method, a roll flattening method, a flow-hole down-drawing method, a redraw method, and the like, but is preferably formed by an overflow down-drawing method. The overflow downdraw method is as follows: the molten glass is caused to flow into an overflow trough provided at the upper portion of a forming body having a substantially wedge-shaped cross section, and the molten glass overflowing from the overflow trough to both sides is caused to flow down along the side wall portions on both sides of the forming body, while being integrally fused at the lower end portion of the forming body, thereby continuously forming a single glass substrate. Thus, a large-sized glass substrate with high accuracy can be formed.

As shown in fig. 1 to 3, the scribing tool 1 has a shank 2 and a cutter 3 fixed to an end of the shank 2.

The holder 2 is made of metal and has a cylindrical or polygonal shape. As shown in fig. 1 and 2, the end of the shank 2 to which the cutter 3 is attached is formed in a pointed shape. The tool holder 2 is attached to a not-shown scribing device. The scribing apparatus holds the holder 2 by a holder not shown, and moves the scribing tool 1 in the vertical direction and the horizontal direction. In addition, the scribing device can freely change the inclination angle of the tool holder 2.

The cutter 3 is made of, for example, a single crystal or polycrystalline diamond cutter, but is not limited thereto, and may be made of PCBN, ceramic, cemented carbide, or other metals. The cutter blade 3 is fixed to the distal end portion of the holder 2 by an adhesive, solder, or the like. The cutter 3 is formed in a truncated cone shape, and a cutting point 4 is formed at an end thereof. That is, the circular edge portion of the axial end surface 3a (first surface 3a) of the cutter 3 serves as the cutting point 4. The radius (curvature radius) of the cutting point 4 is desirably 0.001mm or more and 1mm or less, and more preferably 0.025mm or more and 0.5mm or less.

The circular cutting point 4 can be regarded as being formed by a plurality of circular arcs. For example, as shown in fig. 3, the cutting point 4 is virtually formed by three circular arcs 4a to 4 c. In this example, the central angle θ d of each of the arcs 4a to 4c is set to 120 °, but is not limited thereto, and is desirably set to 5 ° or more and 120 ° or less. The center angles θ d of the respective arcs 4a to 4c are set to be equal, but the center angles θ d of the respective arcs 4a to 4c may be formed at different angles.

In order to cut (break) the glass substrate G using the scribing tool 1 having the above-described structure, first, the glass substrate G is placed on a placing table (not shown) of the scribing apparatus, and the scribing tool 1 mounted on the scribing apparatus is brought into contact with the glass substrate G.

At this time, as shown in fig. 1, the scribing tool 1 is supported by the scribing apparatus such that the holder 2 is inclined with respect to the glass substrate G. As shown in fig. 1A, when the tool holder 2 is inclined toward the movement direction X, the inclination angle θ a is desirably 30 ° or more and 85 ° or less. As shown in fig. 1B, when the inclination angle θ B is in the opposite direction to the moving direction X, the inclination angle θ B may be set to 95 ° or more and 150 ° or less. As described later, when the cutting blade 3 illustrated in fig. 12 is used, the angle θ C with respect to the plate-shaped glass G may be set to 90 °, as shown in fig. 1C.

Thereafter, pressure is applied to the scribing tool 1, and the glass substrate G is slid in the moving direction X while being pressed by the cutter blade 3 (see fig. 1). At this time, the cutting point 4 (the portion of the arc 4 a) is arranged in a direction orthogonal to the moving direction X (see fig. 3). As a result, a linear scribe line SL is formed on the surface of the glass substrate G, and a crack (median crack) C is generated in the thickness direction at the bottom of the scribe line SL (see fig. 4).

When forming the scribe line SL, a stress (tensile stress or bending stress) is generated in the glass substrate G, and thereby the crack C included in the scribe line SL progresses in the thickness direction of the glass substrate G. Thereby, the glass substrate G is cut along the scribe line SL.

As shown in fig. 4, when forming the scribe line SL on the glass substrate G, the dicing point 4 configured in an arc shape (circular shape) forms a concave scribe line SL (groove) on the surface of the glass substrate G. At this time, a protruding portion (protruding portion) 5 protruding upward is formed over the entire length of the scribe line SL at the boundary between the scribe line SL and the surface of the glass substrate G.

For example, when cutting a glass substrate G made of alkali-free glass (OA 10G, manufactured by Nippon electric glass Co., Ltd.), the cutting amount of the cutting point 4 is 0.01 to 1.0mm, the load is 0.5 to 10N, and the moving speed of the scribing tool 1 is 50 to 1500mm/s for a glass substrate G having a thickness of 0.05mm to 3.0mm, whereby the glass substrate G can be appropriately cut without generating a lateral crack. The cutting conditions are not limited to the above values, and may be appropriately set according to the material, size, thickness, hardness, and the like of the glass substrate G.

The cutting blade 3 of the scribing tool 1 is worn at its cutting point 4 due to its use. In this case, a new cutting point 4 is formed on the cutting blade 3 by wear. That is, when the scribe line SL is continuously formed on the glass substrate G at the predetermined inclination angle θ 1 as shown in fig. 5A, the cutting point 4A initially formed on the cutter 3 disappears due to abrasion. Then, as shown in fig. 5B, a new arc-shaped edge portion 4B appears on the surface newly formed on the cutter blade 3 by the wear. By setting the edge portion 4B as a new cut point, the scribe line SL can be continuously formed on the glass substrate G. In this case, it is desirable that the shank 2 is set to an angle θ 2 smaller than the initial inclination angle θ 1 so that the scribe line SL can be formed at the new dicing point 4B (see fig. 5C).

By configuring the cutting point 4 in a circular shape as described above, for example, when a part of the scribing line SL is formed by contacting the glass substrate G, and the part is worn, the scribing line SL is formed by using the other part which is not contacted, and thus the cutter blade 3 can be used for a long period of time.

As shown in fig. 6, the scribing line SL may be formed on the glass substrate G while linearly moving the scribing tool 1 in the moving direction X and rotating the holder 2 around the axial center thereof. Accordingly, since the cutter 3 is also rotated, the life of the scribing tool 1 can be extended as much as possible.

According to the method for manufacturing plate-shaped glass of the present embodiment described above, the scribe line SL is formed on the glass substrate G by the arc-shaped cutting point 4 without generating excessive friction, and the glass substrate G is broken along the scribe line SL, whereby the occurrence of the lateral crack on the cut surface can be prevented. This makes it possible to omit or simplify the grinding (chamfering) process for the cut surface, and to efficiently manufacture high-quality plate glass.

Fig. 7 to 12 show another example of the scribing tool 1. In the example of the scribing tool 1 shown in fig. 7, the cutter blade 3 is formed in a cylindrical or disc shape. In this case, the cutter 3 is made of polycrystalline diamond, PCBN, ceramic, cemented carbide, or the like. The cutter 3 has a first face 3a and a second face 3b at axial ends thereof. In this example, the circular edges of the first surface 3a and the second surface 3b serve as the dicing points 4. In this example, the edges of the first surface 3a and the second surface 3b are formed in a circular shape with a constant radius, but the present invention is not limited thereto. Each edge portion (cutting point 4) may be formed in a circular shape (for example, an elliptical shape) including a plurality of circular arcs having different radii of curvature. In this example, the scribe line SL can be formed on the glass substrate G by the method shown in fig. 6.

When the dicing points 4 of the first surface 3a are used, the second surface 3b is fixed to the holder 2, but when all the dicing points 4 of the first surface 3a are used, the cutter 3 is temporarily removed from the holder 2. Thereafter, the first surface 3a is fixed to the holder 2, and the cutting points 4 on the second surface 3b are used. This enables the cutter 3 to be used for a long period of time.

In the example of the scribing tool 1 shown in fig. 8, the cutting blade 3 is formed in a triangular prism shape. The cutter 3 has a first surface 3a and a second surface 3b at each end in the axial direction. The first surface 3a and the second surface 3b are formed in a triangular shape (for example, regular triangular shape) having an arc-shaped top portion. That is, the corner portions of the

surfaces

3a and 3b are formed with the cut points 4.

Each cutting point 4 is formed so as to be continuous with a linear edge 3c corresponding to a side of the triangle. The radius of curvature of each cutting point 4 is set to be the same, but is not limited thereto. The radii of curvature of the cutting points 4 on the first surface 3a and the second surface 3b may be different. In this example, three cutting points 4 are formed on the first surface 3a of the cutter 3, three cutting points 4 are formed on the second surface 3b, and six cutting points 4 are formed in total.

In the example of the scribing tool 1 shown in fig. 9, the cutter 3 is formed in a truncated triangular pyramid shape. The cutter 3 has a first surface 3a and a second surface 3b having triangular shapes. The first surface 3a and the second surface 3b are formed in a regular triangle shape, and each corner is formed as an arc-shaped cutting point 4. The second surface 3b is larger than the first surface 3 a. Therefore, the radius of curvature of the cut point 4 on the second surface 3b is larger than that of the cut point 4 on the first surface 3 a.

In the example of the scribing tool 1 shown in fig. 10, the cutter 3 has a triangular prism shape as in the example of fig. 8. The cutter 3 has a first cutting point 4a at the top of each of the triangular faces 3a, 3b, and a second cutting point 4b at a portion corresponding to each side of the triangular shape. The first cutting point 4a and the second cutting point 4b have different radii of curvature. That is, the radius of curvature of the second cutting point 4b is larger than the radius of curvature of the first cutting point 4 a.

In the example of the scribing tool 1 shown in fig. 11, the cutting blade 3 is formed in a quadrangular prism shape. Therefore, the axial end surfaces (the first surface 3a and the second surface 3b) of the cutter 3 are formed in a quadrangular shape. Arc-shaped cutting points 4 are formed at the corners of the

surfaces

3a and 3 b. In this example, a total of eight cutting points 4 are formed on each of the

surfaces

3a and 3 b. Each side 3c of the quadrangle on each

surface

3a, 3b is formed in a straight line shape, but is not limited thereto, and the cutting point 4 may be formed in an arc shape as in the example of fig. 10.

In the example of the scribing tool 1 shown in fig. 12, the cutter 3 is formed of a hemisphere, and the cutting point 4 is formed of a spherical surface including an infinite number of arc-shaped portions. In this example, the scribe line SL can be formed on the surface of the glass substrate G by bringing the scribe point 4 made of a spherical surface into contact with the glass substrate G. In this case, the cutter 3 can form the scribing line SL (see fig. 1C) on the glass substrate G by bringing the holder 2 into contact with the glass substrate G obliquely (see fig. 1A and 1B) and by bringing the holder 2 into an attitude at an angle θ C of 90 ° with respect to the glass substrate G.

Further, by using the cutter blade 3 of this example, even when the scribe line SL is formed in a curved line as shown in fig. 13, it is not necessary to perform an operation of rotating the shank 2 around the axial center thereof so as to correspond to the traveling direction of the cutter blade 3. This makes it possible to easily form the scribe line SL.

Fig. 14 and 15 show another example of the cutter used in the scribing tool 1. The cutter 3 is conical in shape and has a plurality of cutting points 4 at its top. The cutting point 4 is formed by combining a plurality of arc-shaped edge portions (edge portions). Specifically, the three cutting points 4 are formed on the cutter 3 by forming each side of the edge portion formed in a triangular shape into an arc shape.

Fig. 16 to 22 show another embodiment of the present invention. Fig. 16 and 17 show an example of a cutter holder (holder) that detachably holds the cutter 3. The cutter holder 6 includes a first support body 7 for supporting the cutter 3, a second support body 8 for supporting the first support body 7, and a third support body 9 for supporting the second support body 8.

The cutter 3 is fixed to the first support 7 via a fixing member 10 such as a screw member. A hole 3d through which the shaft of the fixing member 10 can pass is formed in the center of the cutter 3. Examples of the cutter 3 include a triangular plate or a triangular prism shown in fig. 18A to 18C, a quadrangular plate or a quadrangular prism shown in fig. 18D, and a circular plate or a cylindrical cutter shown in fig. 18E. The cutter 3 illustrated in fig. 18A to 18E has the same features as the cutter 3 illustrated in fig. 7 to 11. The shape of the cutter 3 is not limited to the shape illustrated in fig. 18A to 18E. The cutter 3 may be formed in a polygonal shape such as a pentagon or a special shape having a plurality of corners (cutting points 4). For example, in the cutting blade 3 shown in fig. 18A to 18D, each corner portion may be formed into a spherical surface (corresponding to fig. 12), and the spherical surface may be used as the cutting point 4. Hereinafter, a case of using the triangular cutter 3 illustrated in fig. 18A will be described.

The first support 7 has a first support portion 7a that contacts one surface (second surface 3b) of the cutter 3, a second support portion 7b that contacts one side 3c (edge) of the cutter 3, and a hole 7c for supporting the first support 7 by the second support 8. The first support portion 7a is a surface that contacts the second surface 3b of the cutter 3. As shown in fig. 17, the first support portion 7a is formed in a triangular shape, but is not limited to this shape. The area of the first support portion 7a is set smaller than the area of the cutter 3. The first support portion 7a has a hole 11 through which the fixing member 10 passes. The hole 11 is formed as a screw hole, but is not limited to this configuration. The second support portion 7b is a surface perpendicular to the first support portion 7 a.

The hole 3d is made to coincide with the hole 11 of the first support 7a, and the shaft of the fixing member 10 is screwed into the hole 11 through the hole 3d, whereby the cutter 3 is fixed to the first support 7. The first support body 7 supports the cutter 3 in a state where the second surface 3b of the cutter 3 is in contact with the first support portion 7a and the one side 3c of the cutter 3 is in contact with the second support portion 7b (see fig. 16).

The second support body 8 includes a pair of arm portions 12 that sandwich the first support body 7, an intermediate portion 13 that connects the pair of arm portions 12, and a shaft portion 14 that is formed integrally with the intermediate portion 13. The pair of arm portions 12 sandwich the first support 7 via the

coupling members

15a and 15 b. The

coupling members

15a and 15b are constituted by a bolt 15a and a nut 15b, but are not limited to this configuration.

Each arm portion 12 has a linear first portion 12a integrally formed with the intermediate portion 13, and a linear second portion 12b perpendicular to the first portion 12 a. The pair of first portions 12a are spaced apart at intervals in a direction orthogonal to the shaft portion 14. The second portion 12b is provided at an end of the first portion 12 a. The second portion 12b has a hole 12c through which the shaft portion of the bolt 15a passes.

The first support body 7 is coupled to the second support body 8 as follows. That is, after a part of the first support 7 is disposed between the pair of arm portions 12 (second portions 12b), the shaft portion of the bolt 15a is inserted through the hole 7c of the first support 7 and the hole 12c of one of the arm portions 12. Then, a nut 15b is fitted into an end of the bolt 15a protruding from the other hole 12c of the arm 12, and fastened. Thereby, the second support body 8 supports the first support body 7 in an attitude that cannot be changed.

The posture of the first support body 7 can be changed by loosening the fastening by the

fastening members

15a, 15 b. Thereby, as shown by the two-dot chain line in fig. 16, the angle of the cutter 3 with respect to the cutter holder 6 can be adjusted. In this case, the first support body 7 is rotatably supported by the shaft portion of the bolt 15 a. The first support body 7 is fixed to the arm portion 12 of the second support body 8 again by fixing the posture of the cutter 3 and fastening the

fastening members

15a and 15 b.

The second support member 8 is supported by the third support member 9 so as to be rotatable at a predetermined angle. The intermediate portion 13 of the second support member 8 functions as a restricting portion that restricts the rotation angle of the second support member 8. The intermediate portion 13 regulates the rotation of the second support member 8 by bringing the width-direction edge portion 13a into contact with a part of the third support member 9.

The shaft portion 14 of the second support body 8 is formed in a cylindrical shape, but is not limited to this shape. The shaft portion 14 penetrates into the interior of the third support body 9. The shaft portion 14 is supported by the third support body 9 so as to rotate around the axial center thereof within a predetermined angular range.

As shown in fig. 16 and 17, the third support body 9 includes a first component member 16 that supports the second support body 8, and a second component member 17 that is coupled to the first component member 16.

The first component member 16 is formed in a hollow shape, for example, a cylindrical shape, but is not limited to this shape. The first component member 16 has a mouth 18 at one end thereof for the shaft portion 14 of the second support body 8 to penetrate. The first component member 16 has a bearing 19 rotatably supporting the shaft portion 14 therein.

The first component member 16 has a regulating portion 20 for regulating the rotation of the second support body 8. The restricting portion 20 is a protruding portion that protrudes from one end portion of the first constituent member 16 in the axial direction thereof. The regulating portion 20 has a regulating surface 20a that contacts the intermediate portion 13 of the second support body 8 so as not to rotate the second support body 8 by a predetermined angle or more. The regulating surface 20a is a flat surface formed to be orthogonal to the radial direction of the third support 9.

The second component member 17 is coupled to the first component member 16 so as to close an end of the first component member 16. The second component member 17 is configured in a cylindrical or columnar shape, but is not limited to this configuration. The second component member 17 has a connecting portion 21 at an end thereof, which is detachably attached to the scribing device.

As shown in fig. 19, in the method for manufacturing plate-shaped glass according to the present embodiment, the cutting point 4 of the cutting blade 3 is brought into contact with the glass substrate G while the cutting blade 3 is held by the cutting blade holder 6. In this case, the cutter holder 6 adjusts the posture of the first support 7 to set the angle θ a of the cutter 3 with respect to the glass substrate G. The angle θ a of the cutter 3 is an angle formed by the center line XT with respect to the thickness of the cutter 3 and the surface of the glass substrate G (see fig. 19). The angle (θ B, θ C) of the cutter 3 with respect to the glass substrate G can be set in the cutter holder 6 as in fig. 1B and 1C.

Next, the scribing apparatus moves the cutter holder 6 in a predetermined moving direction X, and slides the cutting point 4 of the cutter 3 with respect to the glass substrate G, thereby forming a scribing line SL. Thereafter, the glass substrate G is broken along the scribe line SL to form plate-shaped glass having a predetermined shape.

In the above-described manufacturing method, the posture of the cutter 3 can be changed by changing the posture of the second support body 8 by rotation during the scribing process. The posture change of the cutter 3 by the rotation of the second support body 8 can be caused, for example, when a curved scribe line SL is formed. In response to the change in the traveling direction of the cutter 3, the second support body 8 rotates about the axis of the shaft portion 14 (see fig. 21) from the reference posture (see fig. 20) in which the intermediate portion 13 is parallel to the regulating portion 20.

As shown in fig. 22, the cutter holder 6 restricts the rotation of the shaft portion 14 of the second support body 8 by bringing the edge portion 13a of the intermediate portion 13 into contact with the restriction surface 20a of the restriction portion 20. It is desirable that the angle θ r at which the second support body 8 can rotate be set to-45 ° or more and 45 ° or less. In this embodiment, the posture of the cutter 3 can be finely adjusted during the scribing process so as not to cause undue or excessive stress on the glass substrate G.

The third support body 9 has a fixing portion 22 for fixing the second support body 8 to be non-rotatable. The fixing portion 22 includes a hole 23 formed in the restricting portion 20 and a fixing member 24 inserted into the hole 23. The hole 23 formed in the regulating portion 20 is formed at right angles to the regulating surface 20 a. A female screw is formed in a part of the hole 23. The fixing member 24 is formed of a screw member such as a bolt. The shaft portion of the fixing member 24 is screwed to the hole 23 of the fixing portion 22.

As shown in fig. 16, the end of the fixing member 24 is configured to protrude from the regulating surface 20a of the regulating portion 20. The position of the end of the fixing member 24 can be changed by rotating the fixing member 24 screwed into the hole 23 of the regulating portion 20. That is, the fixing member 24 is configured to be capable of changing the position between a position (fixed position) at which the end portion thereof comes into contact with a part of the intermediate portion 13 of the second support body 8 to fix the intermediate portion 13 and a position (retracted position, see fig. 16) retracted from the fixed position.

When the end portion of the fixing member 24 is located at the fixing position, the intermediate portion 13 of the second support body 8 is fixed by the fixing member 24 and is in a non-rotatable state. This state is effective, for example, when the cutting point 4 is formed of a spherical surface. When the end portion of the fixing member 24 is located at the retracted position, the fixing member 24 does not contact the intermediate portion 13, and therefore the second support body 8 is in a state of being rotatable within a range restricted by the restriction surface 20a as described above.

Fig. 23 shows another example of the cutter holder. The cutter holder 6 of this example includes a first support body 25 that supports the shank 2 and a second support body 26 that supports the first support body 25.

The first support 25 includes a first component 27, a second component 28, and a coupling member 29 such as a bolt for coupling the first component 27 and the second component 28. The first component 27 and the second component 28 have

grooves

27a, 28a that contact the outer surface of the holder 2. The first component 27 and the second component 28 are coupled by the coupling member 29 in a state where the holder 2 is sandwiched by the groove portion 27a of the first component 27 and the groove portion 28a of the second component 28, whereby the holder 2 is fixed to the first support 25.

The second support body 26 supports the first component 27 of the first support body 25 via a fixing member 30 such as a bolt. The first component 27 of the first support 25 has a hole (not shown) through which the shaft of the fixing member 30 passes. The second support body 26 has a screw hole (not shown) into which the shaft portion of the fixing member 30 is fitted. The shaft portion of the fixing member 30 is screwed into the screw hole of the second support 26 through the hole of the first component 27, and the fixing member 30 is fastened and coupled, whereby the first support 25 is fixed to the second support 26. The posture of the first support body 25 can be changed by loosening the fixing member 30. This enables the posture of the cutter 3 fixed to the end of the holder 2 to be changed (see the two-dot chain line in fig. 23). The second support body 26 includes a connecting portion 31 detachably connected to the scribing device.

The present invention is not limited to the configurations of the above embodiments, and is not limited to the above-described operational effects. The present invention can be variously modified within a range not departing from the gist of the present invention.

In the embodiments of fig. 8 to 11, the triangular prism-shaped or quadrangular prism-shaped cutting blade is exemplified, but the present invention is not limited thereto. The cutting blade may be formed in other polygonal column shapes, and an arc-shaped cutting point may be formed at a corner portion of an end surface in the axial direction.

In the above-described embodiments of fig. 1A to 1C and 6, the glass substrate G is cut by linearly moving the scribing tool 1, but the present invention is not limited thereto, and the glass substrate G may be cut by curvilinearly moving the scribing tool 1. Further, the glass substrate G can be cut by simultaneously moving the plurality of scribing tools 1.

In the case where the cutting blade 3 of the scribing tool 1 is made of single crystal diamond or polycrystalline diamond, even in the case where the cutting spot 4 disappears due to abrasion, the cutting spot 4 can be newly formed on the cutting blade 3 by a known regeneration process (dressing). This enables the cutter 3 to be used for a long period of time.

In the embodiment of fig. 16 to 22, the cutter holder 6 in which the second support body 8 is rotatably supported by the third support body 9 is exemplified, but the present invention is not limited to this configuration. For example, the third support body 9 may be provided with a drive source such as a motor that can rotationally drive the shaft portion 14 of the second support body 8. In this embodiment, the regulating portion 20 is not formed in the third support member 9. By rotating the second support body 8 by the drive source, the scribe line SL can be formed on the glass substrate G while rotating the cutter blade 3. In this case, it is desirable to adjust the posture of the first support body 7 so that the cutting point 4 of the cutter 3 is positioned on the central axis of the shaft portion 14 of the second support body 8.

As another configuration, the third support body 9 may be omitted and the shaft portion 14 of the second support body 8 may be attached to the scribing device. The scribing device may include a driving source capable of rotating the driving shaft 14. By rotating the second support 8 by the scribing device, the scribing line SL can be formed on the glass substrate G while rotating the cutter blade 3.

Description of reference numerals:

1 scribing tool

2 knife handle

3 cutting knife

4 cutting point

6 cutter holder

G glass substrate

SL scribe lines.

Claims

1. A method for manufacturing plate-like glass, which comprises moving a cutter in a predetermined direction to form a scribing line on a glass substrate and breaking the glass substrate along the scribing line to manufacture plate-like glass of a predetermined shape,

the method for producing a plate-like glass is characterized in that,

the cutter has a cutting point that forms the scribing line on the glass substrate by sliding on a surface of the glass substrate,

the cutting point is configured as an arc-shaped edge portion orthogonal to the predetermined direction, and is formed in advance on the cutting blade before the cutting blade is slid with respect to the surface of the glass substrate,

the dicing point forms a protruding portion at a boundary portion between the surface and the scribe line by sliding on the surface of the glass substrate.

2. The method for producing sheet glass according to claim 1,

the cutter is detachably held by the cutter holder.

3. The method for producing sheet glass according to claim 2,

the cutter holder holds the cutter so that the angle of the cutter with respect to the glass substrate can be changed.

4. The method for producing sheet glass according to claim 1 or 2,

the cutter is in a shape of a circular plate,

the cutting point is formed in a circular shape at the edge of the cutter.

5. The method for producing sheet glass according to claim 1 or 2,

the cutter is formed in a polygonal shape,

the cutting points are formed at the corners of the cutter.

6. A method for manufacturing a plate-like glass, wherein a scribing tool is moved in a predetermined direction to form a scribing line on a glass substrate and the glass substrate is broken along the scribing line to manufacture a plate-like glass having a predetermined shape,

the method for producing a plate-like glass is characterized in that,

the scribing tool has a shank and a cutter disposed at an end of the shank,

7. The method for producing sheet glass according to claim 6,

the curvature radius of the cutting point is more than 0.001mm and less than 1 mm.

8. The method for producing sheet glass according to claim 6,

the cutter is in a truncated cone shape,

the cutting point is formed in a circular shape at an edge portion in an axial end portion of the cutter.

9. The method for producing sheet glass according to claim 8,

the scribing line is formed by rotating the cutter around the axis of the cutter while moving the scribing tool in the predetermined direction.

10. The method for producing sheet glass according to any one of claims 6 to 9,

the scribing tool is arranged in a manner that the cutting knife is inclined relative to the glass substrate, and the inclination angle of the scribing tool can be changed.