JP5174112B2 - Scribing wheel - Google Patents

Description

  The present invention relates to a scribing wheel for scribing a brittle material substrate by rolling in a state of being pressed against the brittle material substrate.

  When manufacturing a brittle material substrate such as a glass substrate or a flat panel display, the glass substrate is scribed along a desired line and then broken. In the scribing process, a brittle material substrate is placed on a scribing device, and a scribing line is formed by scribing using a scribing wheel.

  Here, a process of forming a scribe line generated in the glass substrate when the glass substrate is scribed will be described. When rolling is applied to the scribing wheel with a predetermined pressure, if intermittent breaks called rib marks occur along the line where the pressure is applied to the scribing wheel, the continuation up to a predetermined depth will occur below it. It can be confirmed that destruction has occurred. If scribing is finished in such a state, the glass substrate can be easily broken by applying pressure so as to open along the scribe line. Therefore, the quality of the scribe line can be determined by the presence or absence of the rib mark.

  The scribing wheel conventionally used is a disk-like member in which the bottoms of two truncated cones sharing a rotation axis intersect to form a circumferential ridge line, and this is called a first cutting edge. A scribing line can be formed by pressing and rolling the scribing wheel against the glass substrate.

  Patent Document 1 proposes a scribing wheel that can form vertical cracks that are relatively deep with respect to the plate thickness in the vertical direction from the surface of the glass substrate. This scribing wheel is formed by alternately forming, for example, a large number of grooves and protrusions of about 200 to 300 along the circumferential ridge line of the conventional scribing wheel described above. The protrusion is formed by cutting out a circumferential ridge line at a predetermined pitch and depth. Hereinafter, this scribing wheel is referred to as a second cutting edge.

  In addition, a scribing wheel similar to that disclosed in Patent Document 1 has been developed in which the number of grooves is significantly reduced, for example, the number of grooves is five and is arranged equally on the circumference. Hereinafter, this scribing wheel is referred to as a third cutting edge.

  When a glass substrate is divided into small substrates using a scribing device, so-called cross scribing is performed in which a large number of scribe lines are formed in parallel to the glass substrate, and further, the scribe lines are formed in a lattice shape by crossing these scribe lines. Done. In cross scribing, for example, as shown in FIG. 1, scribe lines L1 to L5 are formed by passing through a scribing wheel in parallel, and then the table is rotated 90 ° to form scribe lines L6 to L10.

  As one of scribing methods for scribing a brittle material substrate, there is a scribing method for scribing from the outside to the outside of the brittle material substrate as scribe lines L6 to L10. This lowers the bottom end of the scribing wheel slightly below the top surface of the brittle material substrate at a point slightly outside the end of the brittle material substrate. And scribing is started from one edge of the brittle material substrate by horizontally moving the scribing wheel in a state where a predetermined pressure is applied, and scribing to the other edge. This is hereinafter referred to as outer cutting scribe. In the case of external scribing, since the scribe line reaches both ends of the substrate, break after scribing is easy, but there is a drawback that the substrate is easily damaged at the start of scribing.

  Further, there is a scribing method such as scribing lines L1 to L5 that scribe from the inside to the inside of the brittle material substrate and do not scribe to the outside. This is done by lowering the scribing wheel slightly inward from the edge of the brittle material substrate, and by horizontally moving the scribing wheel to the right in the state with a predetermined downward pressure on the scribing wheel, starting scribing from the inside of the brittle material substrate. And scribes to the inside of the other end. This is hereinafter referred to as “inner scribe”.

Japanese Patent No. 3,074,143

  Conventionally, when scribing using the first cutting edge, the phenomenon that the cutting edge slides on the substrate surface and a scribe line is not formed immediately after rolling of the wheel has been regarded as a problem. It was said to be “bad”. On the other hand, according to the second cutting edge, it is possible to avoid the “bad” state, but there is a problem that the end face strength of the glass after the division is lower than when scribing using the first cutting edge, Depending on the application of the glass, the end face treatment after dividing may be required. In particular, in recent years, from the viewpoint of expanding the application of glass, reducing the thickness of glass, and simplifying the production of products, it is equivalent to the case of scribing using the first cutting edge while avoiding the “bad” state. There is a need for a technique capable of obtaining end face strength.

  If the hook is poor, it is often impossible to perform the inner cut scribe even if the outer cut scribe is possible. Further, when cross-scribing, there is a problem that a so-called “intersection jump” occurs in which the scribe lines are not continuous near the intersection. For example, in FIG. 1, when the scribe lines L1 to L5 are formed and then the table is rotated to form the scribe lines L6 to L10, the rib mark ends at the intersection of the scribe lines, and the intersection skip where the scribe lines are not partially formed. The phenomenon may occur.

  This cause is considered as follows. That is, when a scribe line is first formed, an internal stress is generated near the glass surfaces on both sides across the scribe line. Next, when the scribing wheel passes through the scribe line that has already been formed at a right angle, the force applied in the direction perpendicular to the glass substrate surface from the scribing wheel is scraped off due to internal stress existing in the vicinity thereof. Therefore, it is considered that a scribe line to be formed later is not formed near the intersection.

  When the intersection jump occurs on the glass substrate, the glass substrate is not separated according to the intended scribe line, so that a defective product is generated and the production efficiency is lowered.

  In addition, a glass substrate used for a mobile phone or the like is thin for weight reduction. When scribe-cutting is performed on a substrate with a small thickness, chipping may occur due to the impact applied to the edge of the substrate when the scribing wheel is mounted on the substrate, or the substrate itself may be cracked, resulting in increased product yield. descend.

  Therefore, the inner glass scribe is required so that the edge of the thin glass substrate does not occur. However, since the conventional first cutting edge is poor, there is a case where a scribe line cannot be formed by internal cutting.

  On the other hand, the second cutting edge described in Patent Document 1 is a “good” cutting edge, and a scribe line can be formed immediately after rolling of the scribing wheel. Therefore, by using the second cutting edge, it is possible to scribe inwardly and to prevent intersection jumps even in cross scribing.

  Regarding the end face strength of the glass substrate required for a flat panel display or the like, the second cutting edge has a problem that the end face strength is inferior to that of the first cutting edge. The end face strength depends on the number of grooves formed around the scribing wheel, and the strength decreases as the number of grooves increases. Therefore, for example, if the number of grooves is 300, the end face strength is significantly reduced.

  Further, when scribing using the third cutting edge, the end face strength is almost the same as that of the conventional first cutting edge, but there is a drawback that the starting performance is inferior to that of the second cutting edge.

  Therefore, there is a need for a cutting edge that is easy to apply regardless of the type of the brittle material substrate, that is, a cutting edge that is unlikely to cause jumping at the intersection point and that can ensure the end face strength of the same quality as the first cutting edge.

  The present invention has been made in view of such conventional problems, and when cutting a brittle material substrate, it is easy to start scribing, prevents intersection jumping, and the quality of the cross section of the brittle material (end face) An object of the present invention is to provide a scribing wheel that exhibits a scribing performance with good strength.

In order to solve this problem, a scribing wheel according to the present invention has a disc that scribes a brittle material substrate having an outer peripheral edge portion in which a conical ridge line is formed by intersecting the bottom portions of two truncated cones sharing a rotation axis. The scribing wheel has an outer diameter of 1 to 20 mm, a plurality of grooves are formed along the circumferential ridge line, and each groove has a depth of 1 to 3 μm. When scribing using a scribing wheel, it is formed at an interval that does not contact the brittle material substrate at the same time and at an interval of 100 μm or more, and there is at least one portion where the interval between two adjacent grooves is 100 to 400 μm. When there are two or more pairs of grooves having two adjacent grooves of 100 to 400 μm, the distance between the grooves of each pair is within 10,000 μm. The A predetermined number of first group of grooves formed along the circumferential ridge line; and a second group of grooves formed at positions adjacent to each other in the same rotational direction from the respective grooves of the first group; Each of the second group of grooves adjacent to the first group of grooves at an interval that does not contact the brittle material substrate simultaneously with the first group of grooves when scribing using a scribing wheel; and The distance from the first group of grooves on one side is set to 100 to 400 μm, and the distance from the first group of grooves on the other side is set to 800 to 10,000 μm.

  Here, the number of grooves of the first group of grooves and the number of grooves of the second group of grooves may be 5 or less, respectively.

  Here, the number of grooves in each of the first group and the second group is five, and the pitch of each first group of grooves and the second group of grooves closest to and adjacent to the grooves may be 100 to 400 μm.

  According to the present invention having such characteristics, an end face strength equivalent to that of the first cutting edge can be obtained, and a cutting performance equivalent to that of the second cutting edge can be obtained. Therefore, even a thin brittle material substrate can be internally scribed, and when cross-scribing, the intersection jump does not occur and can be used preferably.

FIG. 1 is a plan view showing a state in which cross scribing is performed using a conventional scribing wheel. FIG. 2 is a front view of the scribing wheel according to the embodiment of the present invention. FIG. 3 is a side view of the scribing apparatus according to the present embodiment. FIG. 4 is a partially enlarged view of the front of the scribing wheel according to the present embodiment.

  The brittle material substrate to be processed in the present invention is not particularly limited in terms of form, material, application and size, and a single substrate or a bonded substrate obtained by bonding two or more single plates. The thin film or the semiconductor material may be attached to or included in the surface or the inside thereof. Examples of the material of the brittle material substrate include glass, ceramics, semiconductors (silicon, etc.), sapphire, and the like. Liquid crystal display panels, plasma display panels, organic EL display panels, surface electric field display (SED) panels And a flat panel display panel such as a field emission display (FED) panel.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 is a front view of the scribing wheel 10 according to the present embodiment as viewed from the rotation axis, and FIG. 3 is a side view thereof. The scribing wheel 10 of the present embodiment is used by being mounted on a scribe head of a conventional scribe device, for example.

  As shown in FIGS. 2 and 3, the scribing wheel 10 includes an outer peripheral edge 14 in which the bottoms of the two truncated cones 13 sharing the rotation shaft 12 intersect to form a circumferential ridge line 11, and a circumferential ridge line 11. It is a disk-shaped member which has the some groove | channel formed in the circumferential direction along. Details of the groove will be described later. The scribing wheel 10 has a shaft hole 15 through which a pin passes to support the scribing wheel 10. The scribing wheel 10 can form the circumferential ridge line 11 by grinding the outer peripheral edge portion 14 of the disc in the radial direction from the axial center, and the convergence angle is α. The material of the scribing wheel 10 is preferably cemented carbide, sintered diamond, ceramics or cermet.

  In the present embodiment, like the third cutting edge described above, the entire circumference is divided into five to form grooves 21-1, 21-2, 21-3, 21-4, and 21-5 at equal intervals. To do. Hereinafter, these grooves are referred to as a first group of grooves 21. Then, one groove 22-1, 22-2, 22-3, 22-4 and 22-5 are respectively formed adjacent to the first group of grooves in the same rotational direction. These grooves are referred to as a second group of grooves 22. Here, two adjacent grooves of the first group and the second group constitute a set of grooves. That is, the grooves 21-i and 22-i (i = 1 to 5) are a set of grooves.

  FIG. 4 is a partially enlarged view showing a pair of grooves formed of the grooves 21-1 and 22-1. The interval between these two grooves is preferably the smallest pitch P among the intervals in which one groove does not contact the brittle material substrate when one groove contacts the brittle material substrate. The interval between two adjacent grooves belonging to the first group and the second group is also the same. That is, when the scribing wheel is pressed against the brittle material substrate, a part of the circumferential ridge line 11 is in a state of biting into the substrate. At this time, two adjacent grooves of the scribing wheel 10, for example, 21-1 and 22-1 are simultaneously formed. The interval should not be touched. The grooves 21 and 22 are formed by cutting out a substantially V-shaped groove from the flat circumferential ridge line 11 at a depth h. By doing so, it is possible to realize a scribing wheel that reliably continues cracking when scribing and has improved performance while maintaining the glass breaking strength of the first cutting edge. Here, if the distance between the first group of grooves and the adjacent second group of grooves is small and at the same time the distance is in contact with the brittle material substrate, the effect for avoiding the “bad” state is low, and the division is There is a tendency for the end face strength of the subsequent brittle material substrate to decrease. The effect of avoiding the “bad” state due to the groove is considered to have a large contribution of the action when the groove starts to contact the brittle material substrate. The second group of grooves begins to contact each other, and the action of the second group of grooves is diminished by the action of the first groove, so that the effect of avoiding the “bad” state is reduced. It is considered a thing. Further, it is considered that the end face strength of the brittle material substrate is likely to be adversely affected when the groove interval is short and in contact with each other at the same time. On the other hand, if the gap between the first group of grooves and the adjacent second group of grooves is too large, a decrease in the end face strength of the brittle material substrate is suppressed, but the “bad” state cannot be avoided. .

  Here, a specific example of the distance between the first group of grooves and the second group of grooves will be described. For example, if the diameter of the scribing wheel is 2 mmφ, the entire circumference of the circumferential ridge line 11 is 6.28 mm. When the scribing wheel is pressed against the brittle material substrate and the cutting edge is bitten into the substrate by 2 μm, the distance is at least 126.4 μm. Among these, the pitch P is preferably 126.4 μm to 400 μm. The distance between two adjacent grooves is 400 to 10000 μm, preferably 800 to 10000 μm. For example, in FIG. 1, the interval between the grooves 22-1 and 21-2 is 800 to 10,000 μm.

  Here, another specific example of the interval between the first groove and the second groove will be described. For example, if the diameter of the scribing wheel is 3 mmφ, the entire circumference of the circumferential ridge line 11 is 9.42 mm. If the scribing wheel is pressed against the brittle material substrate and the cutting edge is bitten into the substrate by 2 μm, the distance is at least 135.6 μm. Among these, the pitch P is preferably 135.6 μm to 400 μm.

  For example, the outer diameter of the scribing wheel is 1 to 20 mm, the depth of the grooves 21 and 22 is 0.5 to 5 μm, and the convergence angle of the circumferential ridge line 11 is 85 to 140 °. A more preferred scribing wheel has an outer diameter of 1 to 5 mm, a depth of the grooves 21 and 22 of 1 to 3 μm, and a convergence angle of the circumferential ridge line 11 of 100 to 130 °. In general, the use of a scribing wheel with a deep notch tends to improve the application to brittle materials (especially, the number of intersections when cross-scribing), and the use of a scribing wheel with a shallow groove This tends to improve the quality (end face strength) of the cross section of the brittle material. Therefore, the depth of the groove is determined so as to maintain this balance. Specifically, the depth of the groove is preferably 1 to 3 μm, for example.

  In the above embodiment, the scribing wheel 10 having the shaft hole 15 for pivotally supporting the scribing wheel is illustrated, but an integrated scribing wheel in which pins are integrally formed may be used. By doing so, the rotation accuracy is high and the sliding resistance can be reduced, so that stable rotation is obtained and the life as a blade edge is long.

  In the present embodiment, the number of grooves in the first group and the number of grooves in the second group are set to 5, respectively, but this number can be determined according to the diameter of the scribing wheel. In order to keep the end face strength equal to that of the first cutting edge, it is preferable that the number of grooves is small. On the other hand, when the scribing is started, the position where the scribing wheel is pressed against the glass substrate and the position where the scribe line is actually formed. In order to reduce the permissible error, a larger number is preferable. Accordingly, the number of grooves is determined by balancing these, but the number of grooves is preferably 5 or less when the diameter is 3 mmφ or less.

  The scribing wheel according to the present invention can be used for scribing a brittle material substrate using the tip of a scribing head of a scribing device. The scribing wheel according to the present invention can also be used for a manual scribing tool that is rotatably mounted on a holder provided at the tip of a handle.

DESCRIPTION OF SYMBOLS 10 Scribing wheel 11 Circumferential ridgeline 12 Rotating shaft 13 Frustum 14 Outer peripheral edge 15 Shaft hole 21-1, 21-2, 21-3, 21-4, 21-5 First group groove 22-1, 22 2, 22-3, 22-4, 22-5 Second group of grooves

Claims (4)

A disc-shaped scribing wheel having an outer peripheral edge portion where a bottom portion of two truncated cones sharing a rotation axis intersects to form a conical ridgeline, and scribing a brittle material substrate,
The outer diameter is 1-20 mm,
A plurality of grooves are formed along the circumferential ridgeline,
Each groove
The depth is 1-3 μm,
It is formed at an interval that does not contact the brittle material substrate at the same time when scribing using a scribing wheel, and at an interval of 100 μm or more,
When there are at least one portion where the distance between two adjacent grooves is 100 to 400 μm, and there are two or more pairs of grooves where the two adjacent grooves are 100 to 400 μm, the distance between each pair of grooves is A scribing wheel that is within 10,000 μm. The outer diameter is 1-20 mm,
A predetermined number of first groups of grooves formed along the circumferential ridgeline;
A second group of grooves formed at positions adjacent to each other in the same rotational direction from each of the grooves of the first group,
The first group of grooves and the second group of grooves have a depth of 1 to 3 μm;
Each of the second group of grooves adjacent to the first group of grooves is spaced at a distance not contacting the brittle material substrate at the same time as the first group of grooves when scribing using a scribing wheel and on one side. A scribing wheel in which the distance to the first group of grooves is set to 100 to 400 μm, and the distance to the first group of grooves on the other side is set to 800 to 10,000 μm.   The scribing wheel according to claim 2, wherein the number of grooves of the first group of grooves and the number of grooves of the second group of grooves are 5 or less, respectively.   4. The number of grooves in each of the first group and the second group is 5, and the pitch of each first group of grooves and the second group of grooves closest to and adjacent to the grooves is 100 to 400 [mu] m. Scribing wheel.

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