JP2007145681A - Cutting blade and cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cut a glass substrate while preventing the occurrence of chipping on a cutting surface. <P>SOLUTION: The cutting blade has a soft part comprising a material having hardness lower than that of glass of the glass substrate to be cut and a thin plate-like hard part arranged in the center part of the soft parts to be held between the soft parts in the cross-sectional shape of the cutting blade and comprising a material having hardness higher than that of glass of the glass substrate to be cut. The tip of the cutting blade is formed to have a projected curved shape in the cross-sectional shape and the hard part is arranged on the projected curved shaped blade tip. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutting blade and a cutting method, and more particularly to a cutting blade and a cutting method for cutting a glass substrate.

  Conventionally, for example, in producing a display panel, a display panel manufacturing method using a pair of large glass substrates having a plurality of panel formation regions is used. As an example of a method for manufacturing such a display panel, a pair of glass substrates in which a plurality of panel formation regions are set are bonded together to create a large multi-cell, and a gap between adjacent panel formation regions in the multi-cell. There is a method of simultaneously manufacturing a plurality of display panels by cutting a predetermined cutting position.

  Here, as a method of cutting the multi-cell, a scribe and break method is frequently used from the viewpoints of high cutting speed and high productivity, and the necessity of not requiring a large facility.

  FIG. 5 shows a cutting blade used in a conventional scribing and breaking method. As shown in FIG. 5, the cutting blade 11 used in the scribing and breaking method has a planar shape formed in a disk shape. Yes. The cutting blade 11 is made of a material having a hardness higher than the glass hardness such as cemented carbide or artificial diamond, and the entire periphery of the cutting blade 11 is a cutting edge 12 having a sharp cross-sectional shape.

  In order to cut a multi-cell into individual display panels with such a conventional cutting blade 11, first, the cutting edge 12 of the cutting blade 11 is brought into contact with the cutting position of the glass substrate 15 in the multi-cell as shown in FIG. Thereafter, a load of about 300 g to 1 kg is applied to cause the tip of the blade edge 12 to bite into the surface of the glass substrate 15.

  Subsequently, the cutting blade 11 is moved while being rotated to form a V-groove scrub line at the cutting position of the glass substrate 15, and then a load is applied from the back surface of the glass substrate 15 along the scribe line. 15 is divided (see, for example, Patent Document 1).

  Thus, individual display panels are cut from the multicell.

  However, in the scribe and break method described above, the entire cutting edge of the cutting blade 11 is made of a material having a hardness higher than the glass hardness in order to form a scribe line, and the tip of the sharp edge 12 is formed on the surface of the glass substrate 15. As a result, the surface of the cutting position of the glass substrate 15 is crushed, and a strong load is applied to the glass substrate 15 by the tip portion and the side edge portion of the blade edge 12 made of a material having a hardness higher than that of the glass. Causes vertical cracks in the vertical direction. At this time, not only the direction perpendicular to the glass substrate 15, that is, the cutting direction C, but also the direction inclined with respect to the glass substrate 15 is distorted. For this reason, the glass substrate 15 is cracked not only in the cutting direction C but also in the inclined direction due to the crushing of the cutting position and the distortion of the glass substrate 15, and as a result, the glass substrate 15 is cut. There was a problem that chipping or chipping might occur on the surface.

  Further, according to the scribing and break type cutting method, a scribe line is formed on the glass substrate 15, and then the glass substrate 15 is divided by applying a load along the scribe line from the back surface of the glass substrate 15. There were many processes, and there was a problem that the glass substrate 15 could not be cut efficiently.

JP 2004-292278 A

  The present invention has been made in view of these points, and provides a cutting blade and a cutting method capable of preventing the occurrence of chipping on a cut surface and efficiently cutting a glass substrate. Objective.

  In order to achieve the above object, the cutting blade according to the present invention is characterized in that, in the cutting blade for cutting a glass substrate, a soft portion made of a material having a hardness lower than the glass hardness of the glass substrate to be cut, and the cutting blade A thin hard part made of a material having a hardness higher than the glass hardness of the glass substrate to be cut and disposed between the soft parts at the center of the soft part in a cross-sectional shape, and the cutting edge is The cross-sectional shape is formed in a convex curve shape, and the hard portion is arranged at the tip of the convex curve-shaped cutting edge.

  Moreover, it is preferable that the said cutting blade is formed in disk shape as a whole, and the whole periphery is made into the blade edge | tip.

  Here, in the present invention, in addition to the case where the entire cutting blade is constituted by the soft portion and the hard portion, the case where the cutting edge of the cutting blade is constituted by the soft portion and the hard portion. Including.

  According to the cutting blade of the present invention, the cutting edge of the cutting blade is formed in a convex curved shape, and a hard portion made of a material having a hardness higher than the glass hardness is brought into contact with the cutting position of the glass substrate. By doing so, it is possible to form a vertical crack in the direction perpendicular to the glass substrate, that is, in the cutting direction, at the cutting position of the glass substrate without crushing the surface of the glass substrate. At the same time, a soft portion made of a material having a hardness lower than the glass hardness is brought into contact with the peripheral portion of the cutting position with a high load, so that the load is applied in a direction inclined with respect to the glass substrate without damaging the glass substrate. Can be added. Then, a component force is generated in the horizontal direction with respect to the vertical crack generated at the cutting position of the glass substrate by the load in the inclined direction, and the vertical crack is caused to be perpendicular to the glass substrate by the horizontal component force. The glass substrate can be cut easily.

  Also, by using a cutting blade whose planar shape is a disc shape and the entire periphery is a cutting edge, the cutting position of the glass substrate can be moved while rotating the cutting blade, and the glass substrate can be easily cut. Can do.

  Further, the cutting method according to the present invention is characterized by using a cutting blade having a convex curved cross-sectional shape and a material having a hardness higher than the glass hardness of the glass substrate to be cut among the cutting edges of the cutting blade. The thin plate-shaped hard part presses the cutting position of the glass substrate to form a vertical crack at the cutting position, and the hardness is lower than the glass hardness of the glass substrate that is arranged and sandwiched so as to sandwich the hard part. By pressing the peripheral part of the cutting position with a soft part made of the material, the progress of the vertical crack is promoted to cut the glass substrate.

  According to the cutting method of the present invention, the cutting edge of the cutting blade is formed in a convex curved cross section, and a hard portion made of a material having a hardness higher than the glass hardness is applied to the cutting position of the glass substrate with a high load. By making the contact, the vertical crack can be formed in the cutting position of the glass substrate in the direction perpendicular to the glass substrate, that is, in the cutting direction, without crushing the surface of the glass substrate. At the same time, a soft part made of a material having a hardness lower than the glass hardness and having elasticity is brought into contact with the peripheral part of the cutting position by a high load, so that the glass substrate is not damaged. The load can be applied in a tilting direction. Then, a component force is generated in the horizontal direction with respect to the vertical crack generated at the cutting position of the glass substrate by the load in the inclined direction, and the vertical crack is caused to be perpendicular to the glass substrate by the component force in the horizontal direction. The glass substrate can be cut by easily proceeding to reach the back surface of the glass substrate.

  As described above, according to the cutting blade and the cutting method according to the present invention, the vertical crack formed at the cutting position of the glass substrate by the load from the hard portion without damaging the glass substrate is caused by the load from the soft portion. The glass substrate can be cut in the vertical direction, that is, in the cutting direction with respect to the glass substrate by the component force acting in the horizontal direction with respect to the vertical crack, thus preventing chipping and chipping on the cut surface. can do.

  Moreover, since a glass substrate can be cut | disconnected by pressing a cutting blade to the cutting position of a glass substrate, a cutting process can be simplified and a glass substrate can be cut | disconnected efficiently.

  Hereinafter, an embodiment of a cutting blade and a cutting method according to the present invention will be described with reference to FIGS. 1 to 4.

  FIG. 1A is a schematic plan view showing a cutting blade according to this embodiment, and FIG. 1B is a schematic cross-sectional view taken along line AA of the cutting blade of FIG.

  As shown in FIGS. 1A and 1B, the cutting blade 1 has a disk-like planar shape and a cross-sectional shape formed in a flat plate shape, and the entire periphery of the disk-like cutting blade 1 is a cutting edge 2. A through hole 3 penetrating the cutting blade 1 is formed at the central portion of the cutting blade 1 in the planar shape. And this cutting blade 1 is supported through the through-hole 3, and cuts the glass substrate 5 by pressing the blade edge 2 to the cutting position of the glass substrate 5 as shown in FIG. 2 while rotating. It is like that.

  The cutting blade 1 has a soft portion 7 having a disk-like planar shape made of a material having elasticity that is lower than the glass hardness of the glass substrate 5 to be cut. The soft portion 7 is preferably made of a titanium-based material having a hardness of about 300 to 800 Hv as compared with a glass having a hardness of 600 to 900 Hv (Vickers hardness).

  A thin plate-like hard portion 8 made of a material having a hardness higher than the glass hardness of the glass substrate 5 to be cut is interposed between the soft portions 7 at the center of the cross-sectional shape of the cutting blade 1. The hard part 8 is formed to have a thickness of about 100 nm to 10 μm, for example, and is preferably made of a material such as diamond-like carbon (DLC) or titanium nitride (TiN) having a hardness of about 3000 to 4000 Hv.

  As shown in FIG. 3, the cutting edge 1 of the cutting blade 1 is formed in a convex curved shape having a semicircular cross section. For example, when the thickness of the cutting edge 1 is 1 mm, r = 0.5 to 1 mm. And the hard part 8 is arrange | positioned at the front-end | tip part of the cutting edge 2 of convex curve shape.

  Next, a method for cutting the glass substrate 5 using the cutting blade 1 according to this embodiment will be described.

  Here, in this embodiment, the case where the multi-cell glass substrate 5 constituting the display panel is cut as the glass substrate 5 to be cut will be described. However, the glass substrate cut by the cutting blade 1 according to the present invention. 5 is not limited to this.

  First, the cutting edge 1 of the cutting blade 1 is brought into contact with the cutting position of the glass substrate 5 in the multicell having a plurality of panel formation regions, and the cutting blade 1 is pressed against the glass substrate with a high load. Here, the high load is such that the load applied to the glass substrate 5 by the cutting blade 1 reaches the back surface of the glass substrate 5 opposite to the contact surface of the cutting blade 1, and in this embodiment, 3 The cutting blade 1 is pressed against the glass substrate with a load of 10 kg.

  Thereby, while a cutting position is pressed by the hard part 8 of the cutting blade 1, the peripheral part of a cutting position is pressed by the soft part 7 arrange | positioned so that the hard part 8 may be pinched | interposed.

  Then, when the hard part 8 is pressed to the cutting position of the glass substrate 5, a load is applied to the glass substrate 5 in the vertical direction, that is, the cutting direction B, and the tip part is formed in a convex curve shape. 7 is pressed at the periphery of the cutting position of the glass substrate 5, and a load is applied in a direction inclined with respect to the glass substrate 5. Here, since the soft portion 7 is made of a material having elasticity lower than the glass hardness of the glass substrate 5 to be cut and having elasticity, the soft portion 7 is inclined with respect to the glass substrate 5 without damaging the glass substrate 5. A load can be applied in the direction.

  At this time, since the hard portion 8 is made of a material having a hardness higher than the glass hardness, the vertical crack 10 is generated in the cutting direction B at the cutting position of the glass substrate 5 and the glass substrate 5 added by the soft portion 7. Since a horizontal component force is generated with respect to a vertical crack generated at the cutting position of the glass substrate 5 due to a load in a direction inclined with respect to the horizontal substrate, the vertical crack 10 is applied to the glass substrate 5 by the horizontal component force. And proceed in the cutting direction B. The vertical crack 10 reaches the back surface of the glass substrate 5.

  And the glass substrate 5 can be cut | disconnected by moving the cutting blade 1 along a cutting position, rotating the cutting blade 1 centering | focusing on the through-hole 3, Thereby, each display panel can be cut | disconnected from a multicell. Can be divided.

  According to this embodiment, the cutting edge 1 of the cutting blade 1 is formed in a convex curved cross section, and the hard portion 8 made of a material having a hardness higher than the glass hardness is high at the cutting position of the glass substrate 5. By making contact with the load, the vertical crack 10 in the direction perpendicular to the glass substrate 5, that is, the cutting direction B can be formed at the cutting position of the glass substrate 5 without crushing the surface of the glass substrate 5. . At the same time, the soft substrate 7 made of a material having a hardness lower than the glass hardness and having elasticity is brought into contact with the peripheral portion of the cutting position with a high load, so that the glass substrate 5 is not damaged. The load can be applied in a direction inclined with respect to the angle. The load in the inclined direction causes a horizontal component force to the vertical crack 10 at the cutting position of the glass substrate 5, and the vertical crack 10 easily proceeds in the cutting direction B by the horizontal component force. It can be made to reach | attain the back surface of the glass substrate 5, and, thereby, the glass substrate 5 can be cut | disconnected.

  Therefore, the vertical crack 10 is advanced in the cutting direction B of the glass substrate 5 by the horizontal component force generated in the glass substrate 5 by the load in the tilt direction without damaging the glass substrate 5 to cut the glass substrate 5. Therefore, chipping on the cut surface can be prevented. As a result, a high-quality display panel free from chipping or chipping on the cut surface of the glass substrate 5 can be produced.

  Moreover, since the glass substrate 5 can be cut | disconnected by pressing the cutting blade 1 to the cutting position of the glass substrate 5, the simplification of a cutting process can be aimed at and the glass substrate 5 can be cut | disconnected efficiently. it can.

  Furthermore, since the cutting edge 2 of the cutting blade 1 is formed in a convex curve shape, the cutting blade 1 is pressed against the glass substrate 5 with a load about 10 times higher than the conventional one without crushing the glass substrate 5. be able to.

  Furthermore, since the cutting blade 1 has a disc shape and the entire periphery is the cutting edge 2, the glass substrate 5 can be easily moved by moving the cutting position of the glass substrate 5 while rotating the cutting blade 1. Can be cut off.

  In addition, this invention is not limited to the said embodiment, A various change is possible as needed.

  For example, in the present embodiment, the cutting blade 1 has a disk-like planar shape and a flat cross-sectional shape, but the shape of the cutting blade 1 is not limited to this embodiment. As shown in FIG. 4, the cutting blade 1 may have an elliptical cross-sectional shape.

  Further, in the present embodiment, the cutting blade 1 has a disk-shaped soft portion 7 and a disk-shaped hard portion 8 sandwiched between the soft portions 7, but is not limited thereto, The cutting edge 2 of the cutting blade 1 should just be comprised by the said soft part 7 and the said hard part 8. FIG.

(A) is a schematic plan view which shows one Embodiment of the cutting blade which concerns on this invention, (b) is typical sectional drawing in the AA of the cutting blade of Fig.1 (a). Typical sectional drawing which shows the state which pressed the cutting blade of Fig.1 (a) (b) on the glass substrate Typical sectional drawing which shows the front-end | tip part of the blade edge | tip of the cutting blade of Fig.1 (a) (b) Typical sectional drawing which shows other embodiment of the cutting blade which concerns on this invention. Schematic sectional view showing an example of a conventional cutting blade Typical sectional drawing which shows the state which pressed the cutting blade of FIG. 5 against the glass substrate

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting blade 2 Cutting edge 3 Through-hole 5 Glass substrate 7 Soft part 8 Hard part 10 Vertical crack B Cutting direction

Claims (3)

In the cutting blade that cuts the glass substrate,
A soft portion made of a material having a hardness lower than the glass hardness of the glass substrate to be cut, and a central portion of the soft portion in the cross-sectional shape of the cutting blade, sandwiched between the soft portions and cut. It has a thin hard part made of a material with a hardness higher than the glass hardness,
The cutting edge has a cross-sectional shape formed in a convex curve shape, and the hard portion is disposed at a tip of the convex curve-shaped blade edge.   The cutting blade according to claim 1, wherein the cutting blade is formed in a disk shape as a whole and has a peripheral edge as a cutting edge.   Using a cutting blade having a convex curved cross-sectional shape, the cutting position of the glass substrate is determined by a thin hard portion made of a material whose hardness is higher than the glass hardness of the glass substrate to be cut among the cutting edges of the cutting blade. The peripheral portion of the cutting position is formed by a soft portion made of a material having a hardness lower than the glass hardness of the glass substrate that is pressed and forms a vertical crack at the cutting position and is sandwiched between the hard portions. A cutting method characterized by accelerating the progress of the vertical cracks and cutting the glass substrate by pressing.

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