JP5408450B2 - Scribing wheel - Google Patents

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 is formed with a U-shaped or V-shaped groove on the cutting edge in order to give a hitting impact and improve the permeability to a brittle material substrate (extension of vertical cracks). A projection is used. 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, when scribing a brittle material substrate using a scribing wheel having such a groove, the cutting edge rotates during scribing and the groove portion sequentially contacts the brittle material substrate, but the groove provided in the ridge line portion of the cutting edge is brittle. There are cases where cullet and fine powder (hereinafter referred to as particles) generated when the material substrate is scribed. Since particles do not uniformly enter a large number of grooves, variations occur in the amount of biting (cutting amount) in the groove portion of the edge of the cutting edge. For this reason, the depth of vertical cracks generated in the brittle material substrate is not stable, resulting in problems such as failure of division and shortening of the scribing wheel life.

  The present invention has been made paying attention to such conventional problems, and an object of the present invention is to provide a scribing wheel that does not adversely affect the scribe by particles entering 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 in a ridge line portion of the cutting edge. A retreating part deeper than the bottom surface of the groove for retreating particles generated during scribing is provided on the bottom surface of the groove .

  Here, the retreating portion of the groove is a discharge groove for discharging particles from the bottom surface of the groove, and the discharge groove has an inverted V shape when viewed from a direction perpendicular to the axis of the scribing wheel, and the inverted V shape. The end of the discharge groove may be continuous with the slope of the V-shaped cutting edge.
  Here, the retreating portion of the groove is a discharge groove for discharging particles from the bottom surface of the groove, and the discharge groove is a flat groove parallel to the rotation axis of the scribing wheel, and the discharge groove is formed from the bottom surface. The end of the discharge groove may be continuous with the slope of the V-shaped cutting edge.
  Here, the retracting portion of the groove may be a recessed particle pocket provided inside the bottom surface of the groove.

  As described above, according to the present invention, a groove is formed in the ridge line portion of the cutting edge of the scribing wheel, and a retreat portion such as a discharge groove or a particle pocket for retreating particles is provided in the groove. For this reason, even when cullet or the like is generated at the time of scribing, the particles are discharged or enter the particle pocket, so that the scribe itself is not adversely affected. For this reason, the effect that the scribing failure and the life of the blade edge are not shortened can be obtained.

FIG. 1 is a front view and a side view of a scribing wheel according to an embodiment of the present invention. FIG. 2 is a partially enlarged view showing small circles A and B of FIG. 1 of the scribing wheel according to the first embodiment of the present invention. FIG. 3 is a partially enlarged view showing portions corresponding to the small circles A and B of FIG. 1 of the scribing wheel according to the modification of the present embodiment. FIG. 4 is a partially enlarged view showing small circles A and B in FIG. 1 in a scribing wheel according to the second embodiment of the present invention. FIG. 5 is a partial sectional view showing a portion corresponding to the small circles A and B of FIG. 1 of a scribing wheel according to a modification of the second embodiment of the present invention. FIG. 6 is a partially enlarged view showing portions corresponding to the small circles A and B of FIG. 1 in a scribing wheel according to the third embodiment of the present invention. FIG. 7 is a partial sectional view showing a portion corresponding to the small circle A in FIG. 1 of a scribing wheel according to a modification of the third embodiment of the present invention. FIG. 8 is a partial sectional view showing a portion corresponding to the small circle A in FIG. 1 of a scribing wheel according to a modification of the third 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. 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.

  2A 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. 1A, and FIG. 2B is a view seen from a direction perpendicular to the rotation axis of the scribing wheel. FIG. 2C is an enlarged view of a portion indicated by a small circle B in FIG. 1B, and FIG. 2C is a cross-sectional view taken along the line CC in FIG. As shown in FIGS. 2 (a) and 2 (b), a large number of grooves 14 are formed in the ridge line portion of the blade edge 13 in a substantially uniform U shape.

  As shown in FIG. 2C, a deeper inverted V-shaped discharge groove 15 is provided at the center of the groove 14. The discharge groove 15 discharges particles to the outside when particles such as cullet enter the groove 14 at the time of scribing, and constitutes a particle retracting portion.

  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. It is possible to repeat the process of cutting out the groove and the discharge groove once, cutting the groove and the discharge groove once, and rotating the rotation angle corresponding to the pitch, and then cutting out the groove and the discharge groove again. Such grooves are formed, for example, at a pitch of 20 to 500 μm on the entire circumference of the circumferential ridgeline. For the formation of the groove and the discharge groove, laser machining or electric discharge machining can also be used. For example, after the groove is cut out by a grinder, the discharge groove may be formed by laser machining.

  When scribing is performed using the scribing wheel according to such an embodiment, particles such as dust and cullet generated during scribing are generated by the operation of the scribing device. The particles may enter the groove 14 of the scribing wheel 11, but when the groove portion comes into contact with the brittle material substrate, the particles in the groove 14 are pushed out from the discharge groove 15 to the outside of the scribing wheel. Therefore, the amount of cutting can be set in accordance with the load applied to the scribing wheel, and even if particles enter the groove 14, the scribing is not adversely affected.

  The particle discharge grooves 15 are provided symmetrically with respect to the ridge line as shown in FIGS. 2B and 2C, but may be provided only on one of them.

  Next, a modification of this embodiment will be described with reference to FIG. FIGS. 3A, 3B, and 3C are modifications by the scribing wheel of the first embodiment, and only the shape of the retracting portion is different. In this modification, the discharge groove 16 is a flat groove parallel to the rotation axis as shown in FIG. Also in this case, the particles can be discharged from the discharge groove 16, and the manufacture becomes easy.

  Next, a second embodiment of the present invention will be described. The overall configuration is the same as that shown in FIG. 1, and the groove shape of the cutting edge is different. In the first embodiment described above, a discharge groove for discharging particles to the outside is provided. In the second embodiment, a particle pocket for retracting particles is provided as a retracting portion. That is, as shown in FIGS. 4 (a) and 4 (b), a large number of grooves 21 are formed in the ridge line portion of the blade edge 13 by cutting it into a substantially U-shape. In the present embodiment, a particle pocket 22 is formed at the bottom of the groove 21 as shown in the figure. For example, as shown in FIG. 4B, the particle pocket 22 has a substantially circular recess formed in the innermost portion of the groove 21. The particle pocket 22 constitutes a retracting unit for retracting particles such as cullet that enter the groove 21 during scribing.

  Next, FIGS. 5A and 5B are modifications of the scribing wheel according to the second embodiment, and only the shape of the particle pocket is different. In this modification, the particle pocket 23 is notched in a rectangular wave shape as shown in FIG. 5A, and the other configurations are the same as those described above.

  Next, a scribing wheel according to a third embodiment of the present invention will be described. The overall configuration is the same as that shown in FIG. 1, and the groove shape of the cutting edge is different. FIG. 6 is an enlarged view showing a groove of a scribing wheel according to the third embodiment. As shown in this figure, V-shaped grooves 24 are cut out at regular intervals in the ridge line portion 13 of the blade edge, thereby forming protrusions with a constant pitch. The groove 24 is V-shaped, but a sharper V-shaped particle pocket 25 is provided in the innermost part of the groove. Instead of the particle pocket 25, a U-shaped particle pocket 26 may be provided in the innermost portion of the V-shaped groove 24 as shown in FIG. 7, and the particle pocket 27 may be made deeper as shown in FIG. . As a further modification, a discharge groove may be formed in the V-shaped groove as in the first embodiment (FIG. 2) or the modification of the first embodiment (FIG. 3). it can.

  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. It can be configured by notching one groove, temporarily retracting it and rotating it by the rotation angle corresponding to the pitch, then repeating the process of notching the groove again over the entire circumference, and further laser processing the particle pocket. . Such grooves are formed, for example, at a pitch of 20 to 500 μm on the entire circumference of the circumferential ridgeline.

  When scribing is performed using the scribing wheels according to the second and third embodiments, particles such as dust and cullet generated during scribing are generated by the operation of the scribing device. Particles may enter the grooves 21 and 24 of the scribing wheel, but when the groove portions come into contact with the brittle material substrate, the particles in the grooves are pushed inward and the particle pockets 22, 23, 25, 26, 27, etc. Get in. Therefore, the particles can be retreated, and the amount of cutting can be set according to the load applied to the scribing wheel. Therefore, even if particles enter the groove, scribing is not adversely affected. After scribing a certain distance, the particles accumulated in the particle pocket can be removed by cleaning the scribing wheel by blowing air, for example.

  The groove shape of the blade edge is not limited to the U-shape or V-shape, and may be, for example, rectangular. However, there are two shapes in view of scribe performance, quality of the cross section, easiness of groove formation, wheel life, etc. It is preferable to have a U-shape or a V-shape having a flat portion on which the surface of the projection formed between the grooves is not sharp.

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

11 Scribing wheel 12 Through hole 13 Cutting edge 14, 21, 24 Groove 15, 16 Discharge groove 22, 23, 25, 26, 27 Particle pocket

Claims (4)

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 a ridge line portion of the blade edge, and a retreating portion deeper than the bottom surface of the groove for retreating particles generated during scribing is provided on the bottom surface of the groove . The retreating portion of the groove is a discharge groove for discharging particles from the bottom surface of the groove, and the discharge groove has an inverted V shape when viewed from a direction perpendicular to the axis of the scribing wheel, and the apex of the inverted V shape. 2. The scribing wheel according to claim 1 , wherein is deeper than a bottom surface of the groove, and an end portion of the discharge groove is continuous with a slope of a V-shaped cutting edge . The recess of the groove is a discharge groove for discharging particles from the bottom surface of the groove, and the discharge groove is a flat groove parallel to the rotation axis of the scribing wheel, and the discharge groove is deeper than the bottom surface. The scribing wheel according to claim 1 , wherein an end of the discharge groove is continuous with a slope of the V-shaped cutting edge .   The scribing wheel according to claim 1, wherein the retracting portion of the groove is a recessed particle pocket provided inside the bottom surface of the groove.

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