JP2012082099A - Scribing wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the lifetime of a scribing wheel having grooves formed along a circumferential ridgeline.SOLUTION: A V-shaped blade edge 13 is formed along the circumference of the scribing wheel. Fine channel-shaped grooves 14 are formed at constant intervals in a circumferential part which serves as the blade edge 13. Projections are formed between the grooves 14. Drawing tangents at intersections of a groove and projections and at positions closest to the intersections, the angle α of tangent intersection that the tangents at both ends contain is 90-135°. Consequently, chipping of the blade edge is reduced when scribing using the scribing wheel is performed to prolong the lifetime.

Description

  The present invention relates to a scribing wheel for scribing a brittle material substrate such as a glass substrate.

  In the conventional scribing wheel, the circumferential portion is cut obliquely from both sides of a cemented carbide or sintered diamond disc to form a V-shaped blade on the circumferential surface. The scribing wheel has a through hole at the center, and is used by being rotatably attached to a scribing head or the like of a scribing device.

  As shown in Patent Document 1, a conventional scribing wheel has been used in which grooves are formed to give a multipoint impact to the cutting edge in order to improve the permeability to the brittle material substrate, and a protrusion is formed between the grooves. If the number of grooves is increased, the permeability can be improved, and a scribing wheel in which, for example, hundreds of tens of grooves are formed at a predetermined depth on the circumference is also used.

Japanese Patent No. 3074143

  However, the conventional scribing wheel having grooves can form a deep scribe line with respect to the brittle material substrate because of its excellent permeability, but has a relatively short life. For this reason, there is a drawback that the frequency of exchanging the scribing wheel increases.

  The present invention has been made paying attention to such a conventional problem, and an object of the present invention is to provide a scribing wheel having a long life by changing the shape of the groove in the scribing wheel having the groove.

  In order to solve this problem, the present invention provides a scribing wheel in which a V-shaped cutting edge is formed along a circumferential portion of a disc-shaped wheel, and a groove having a predetermined shape is formed on the cutting edge. The tangent intersection angle formed by the two tangents drawn at both ends of the head is 90 ° or more and 135 ° or less.

  Here, the groove may be a U-shaped groove formed on the circumference of the ridgeline.

  Here, the groove may be a V-shaped groove formed on the circumference of the ridgeline.

  As described above, the present invention forms a groove in the ridge line portion of the cutting edge of the scribing wheel and forms a protrusion therebetween, so that a long vertical crack can be generated without causing a horizontal crack by the action of the protrusion. it can. Further, since the life is extended, an excellent effect that the replacement frequency of the scribing wheel can be reduced is obtained.

FIG. 1 is a front view and a side view of a scribing wheel according to a first embodiment of the present invention. FIG. 2 is a partially enlarged view showing a ridge line portion of the scribing wheel according to the first embodiment of the present invention. FIG. 3 is a partially enlarged view showing a ridge line portion of a scribing wheel according to a conventional example. FIG. 4 is a table showing the results of scribing wheel life when scribing a glass plate with a predetermined recommended cutting edge load according to the conventional example and this embodiment. FIG. 5 is a partially enlarged view showing a ridge line portion of a scribing wheel according to the second embodiment of the present invention.

  FIG. 1 (a) is a front view of a scribing wheel according to the first embodiment of the present invention, and FIG. 1 (b) is a side view thereof. FIG. 2 is a partially enlarged view showing a side surface of the ridge line portion of the scribing wheel shown in the small circle A of FIG. The scribing wheel 11 of the present embodiment is a disk-shaped member, and a through hole 12 for passing a rotating shaft is provided at the center thereof. The circumferential portion is cut at an angle from both sides to form a V-shaped cutting edge 13 on the circumferential surface.

  In the present embodiment, as shown in FIG. 2, a large number of grooves 14 are formed in the ridge line portion of the blade edge 13 by cutting it almost uniformly into a U shape. The depth of the U-shaped groove 14 is d1, and protrusions with a constant pitch are formed by notching at regular intervals. Here, the width of the groove 14 is D1, and the width of the protrusion is S1. Assuming that the intersection of the groove and the protrusion is an intersection, the angle at which the two tangents intersect when the tangent is drawn to the position closest to the intersection from the U-shaped groove side is defined as the tangent intersection angle α1. In the present embodiment, a larger angle than the conventional one is selected as the tangent intersection angle α1, and here, it is 90 °.

  A number of such notches along the circumference are rotated by connecting a circular grindstone to a grinder motor and contacting the scribing wheel 11 perpendicularly to the grinder surface. The groove can be cut out, temporarily retracted and rotated by a rotation angle corresponding to the pitch, and then the process of cutting out the groove again can be repeated over the entire circumference. At this time, various shapes of grooves can be formed depending on the tip shape of the circular grindstone.

  The scribing wheel according to the present embodiment does not generate a horizontal crack even when the blade load is increased, and a long vertical crack is obtained in proportion to the magnitude of the load. If this vertical crack is long, an accurate break along the scribe line can be performed in the break operation of the next process, and the yield is improved. In addition, since the break work is easy, the content of the break process can be relaxed or simplified, and in some cases, the break process can be omitted.

  Next, advantages of the scribing wheel according to the present embodiment will be described in comparison with a conventional scribing wheel. Here, the scribing wheel according to the present embodiment has a wheel diameter of 2.5 mm and a wheel thickness of 0.65 mm, for example. The depth d1 of the groove is 9 μm, and the tangential intersection angle α1 is 90 °. Further, the conventional scribing wheel used as a comparison object has the same diameter as the scribing wheel of the present embodiment, the notch depth d2 is 10 μm, and the number of notches is 135 as shown in FIG. In this conventional scribing wheel, the groove width is D2, the protrusion width is S2, and the tangent intersection angle α2 is 82 °.

  FIG. 4 is a table showing results of use when the LCD bonded substrate is scribed using the conventional scribing wheel and the scribing wheel according to the present embodiment. As shown in FIG. 4, when the conventional scribing wheel was used to travel 8000 m, 21 ridges were missing. After that, even when trying to continue scribing, the rib mark was not established, there was no scribing load range, and scribing became impossible.

  On the other hand, in the scribing wheel of the present embodiment, the ridgeline chipping was 0 when the cruising wheel traveled 8000 m under the same conditions. For this reason, it is possible to continue scribing, and it is possible to perform appropriate scribing until the scribing performance deteriorates due to reasons other than chipping of the ridgeline, such as wear. As described above, in the present embodiment, the scribe wheel can have a long life by setting the angle formed by the tangent lines at both ends of the groove to 90 °.

  Here, in this embodiment, the tangent intersection angle α1 is 90 °, but this angle is 90 ° or more and 135 ° or less, preferably 90 ° or more and 120 ° or less. If the tangential intersection angle α1 is increased, the biting (hanging) on the brittle material substrate is deteriorated, and there is a manufacturing limit. Therefore, in the present invention, the maximum tangent intersection angle is set to 135 °.

  Next, a scribing wheel according to a second embodiment of the present invention will be described. The overall configuration is the same as that shown in FIG. 1, and only the groove shape of the cutting edge is different. FIG. 5 is an enlarged view showing a groove of a scribing wheel according to the second embodiment. As shown in this figure, V-shaped grooves 15 are cut out at regular intervals in the edge line portion 13 of the blade edge. Then, the width of the groove 15 is D3 and the width of the protrusion is S3, thereby forming protrusions with a constant pitch. In this case as well, by setting the tangential intersection angle α3 to 90 °, the life can be extended as compared with the conventional example.

  The scribing wheel of the present invention described above can be used for a hand-cut type scriber in addition to a scribing device for scribing a brittle material substrate.

11 Scribing wheel 12 Through hole 13 Cutting edge 14, 15 Groove

Claims (3)

In a scribing wheel formed by forming a V-shaped cutting edge along the circumference of the disc-shaped wheel,
A scribing wheel in which a groove having a predetermined shape is formed in the blade edge, and a tangent intersection angle formed by two tangent lines drawn at both ends of the groove is 90 ° or more and 135 ° or less.   The scribing wheel according to claim 1, wherein the groove is a U-shaped groove formed on a circumference of a ridge line.   The scribing wheel according to claim 1, wherein the groove is a V-shaped groove formed on a circumference of a ridge line.

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