JP2010126387A - Cutter wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form vertical crack up to a deep position while suppressing the occurrence of horizontal crack when a scribe line is formed on a glass plate using a cutter wheel. <P>SOLUTION: An inclined cutting blade surfaces 2, 2 having a diameter increased toward the inside in the axial direction from both end part side in the axial direction are respectively formed along the circumferential direction on the outer circumferential surface of a disk-like cutter wheel body 1a and edge cutting blade surfaces 3a, 3a each having larger inclined angle than that of the inclined cutting blade surface 2 and constituting the blade edge 3 by ranging with each other are formed between the inclined cutting blade surfaces 2, 2 to make series thereto. The angle of the edge is made suitably to be right angle or acute angle and the crossing angle between the inclined blade surfaces is made to be obtuse angle. The vertical crack is formed deep and the effect to suppress the occurrence of the horizontal crack is attained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cutter wheel for processing a scribe line (cutting line) by rolling while being pressed against the surface of a glass plate or the like.

A glass cutter wheel 20 used for processing (scribing) a scribe line on the surface of a glass plate is formed in a disk shape having a diameter φ as shown in FIG. A letter-shaped cutting edge 21 is formed.
In the scribing process, as shown in FIG. 10, a load is applied to the glass cutter wheel 20, the glass plate 30 is pressed, and the glass cutter wheel 20 is rotated at the front edge of the contact portion (loading process in the figure). In the loading process, plastic deformation occurs in the blade edge pushing portion of the glass plate 30, and the vertical crack 33 is generated from the boundary between the elastic deformation region 31 and the plastic deformation region 32 immediately below the blade edge as the load increases, and grows. Next, with the rotation of the glass cutter wheel 20, the load is unloaded at the trailing edge of the contact portion (unloading process in the figure), the vertical crack 33 is closed, and a residual strain extension crack 34 is generated in the deep portion of the vertical crack 33 (for example, Non-patent documents 1 and 2).

In the unloading process, the horizontal crack 35 grows from the boundary 32 between the elastic deformation region 31 and the plastic deformation region when the magnitude of the load and the angle θ of the blade edge are inappropriate, and when the crack propagates to the glass surface, a defect called chipping occurs. . In other words, horizontal cracks may occur depending on the scribing conditions, and are a factor unnecessary for cutting the glass plate and cause product defects.
Noboru Morita, “Journal of Abrasive Technology”, Vol.45 No.7, 2001 Jul., 335-337 Torui et al., “Proceedings of Academic Lecture Meeting 2008”, P.179-184

By the way, it is desirable that the vertical crack is deeply formed in order to cut the glass plate. In order to deepen the vertical crack, it is conceivable to increase the load applied to the glass plate by the glass cutter wheel.
However, when the load applied to the glass plate is increased, the horizontal crack described above is liable to occur, and there is a problem that the product quality is deteriorated.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a cutter wheel that can deeply form vertical cracks in a workpiece while suppressing the occurrence of horizontal cracks.

  That is, among the cutter wheels of the present invention, the first present invention has inclined cutting blade surfaces that increase in diameter from both axial end sides toward the inner side in the axial direction on the outer peripheral surface of the disc-shaped cutter wheel body. The cutting edge surfaces that are formed along the circumferential direction and have an inclination angle larger than the inclination angle of these inclined cutting blade surfaces between the inclined cutting blade surfaces and that are connected to each other to form the cutting edge are respectively formed on the inclined cutting blade surfaces. It is characterized by being formed to be continuous.

  The cutter wheel according to the second aspect of the present invention is characterized in that, in the first aspect of the present invention, the axial width of the cutting edge is 1 to 50 μm.

  The cutter wheel according to a third aspect of the present invention is characterized in that, in the first or second aspect of the present invention, the inclination angle increases stepwise or continuously from the inclined cutting edge surface to the cutting edge cutting edge surface. To do.

  In the cutter wheel of the fourth invention, in any one of the first to third inventions, the angle of the blade edge is a right angle or an acute angle, and the crossing angle between the inclined cutting blade surfaces is an obtuse angle. Features.

  The cutter wheel according to a fifth aspect of the present invention is characterized in that, in the fourth aspect of the present invention, an intersecting angle between the inclined cutting blade surfaces is 110 to 150 degrees.

  The cutter wheel according to a sixth aspect of the present invention is characterized in that, in any one of the first to fifth aspects of the present invention, an uneven shape is provided on the inclined cutting blade surface at intervals in the circumferential direction. .

That is, according to the present invention, when a workpiece such as a glass plate is processed, when the cutter wheel is pressed against the surface of the workpiece, the workpiece surface is pressed through the inclined cutting blade surface, and the cutting edge is moved along with the cutting edge. It is pushed deeper into the inside than the pressing surface and pushes the workpiece. At this time, since the tensile stress that generates the vertical crack is generated at a deeper position from the workpiece surface than the conventional cutter wheel, the vertical crack is formed deeply, and the cutter wheel is separated from the workpiece surface. When unloading, horizontal cracks occur because the tensile stress that generates horizontal cracks occurs at a position farther away from the boundary between the elastic deformation region and plastic deformation region where horizontal cracks occur than with conventional cutter wheels. Is suppressed.
As a result, the horizontal crack can be suppressed and the vertical crack can be formed deeply even under a load equivalent to the conventional one.
Moreover, since the effect | action which suppresses a horizontal crack is acquired, it also becomes possible to process by applying a bigger load than before.

  The size of the cutter wheel, such as the diameter and outer peripheral surface width, is not particularly limited. However, the axial width of the cutting blade is in the range of 1 to 50 μm in consideration of the size of a general scribe line. The inside is appropriate, and the depth of the cutting edge is suitably 1 to 50 μm.

  In addition, the inclination angle between the inclined cutting edge surface and the cutting edge cutting edge surface (angle with respect to the cutter wheel axial direction) only needs to be relatively larger at the cutting edge cutting edge surface, and is not limited to a specific angle as an absolute value. Absent. However, in order to perform this function more effectively, the angle of the cutting edges (intersection angle between the cutting edge surfaces) is a right angle or acute angle (an angle smaller than the right angle), and the crossing angle between the inclined cutting surfaces is an obtuse angle (from the right angle). It is desirable that the angle be larger. As an angle of intersection between the inclined cutting blade surfaces, for example, 110 to 150 degrees is shown.

  Moreover, in the said cutter wheel, an unevenness | corrugation can be provided in the inclined cutting-blade surface at intervals in the circumferential direction. The irregularities may be provided at regular intervals in the circumferential direction, or may be provided with varying intervals. The unevenness causes a load fluctuation by being pressed against the surface of the workpiece when rotating the workpiece, the pushing of the blade edge into the workpiece is promoted, and vertical cracks are easily made deep, Generation of horizontal cracks is suppressed. In addition, since the unevenness is provided only on the inclined cutting surface and not on the cutting edge surface, the uneven shape is not transferred to the scribe line formed on the workpiece, and the scribe line shape accuracy Can be maintained well.

  As described above, according to the cutter wheel of the present invention, the inclined cutting blade surfaces that increase in diameter from the both ends in the axial direction toward the inside on the outer peripheral surface of the disc-shaped cutter wheel main body respectively along the circumferential direction. The blade edge cutting blade surfaces that form a blade edge between the inclined cutting blade surfaces that have an inclination angle larger than the inclination angle of the inclined cutting blade surfaces and that are connected to each other are formed to be continuous with the inclined cutting blade surfaces. Therefore, the vertical cracks are deeply formed and the occurrence of horizontal cracks is suppressed.

(Embodiment 1)
An embodiment of the present invention will be described below with reference to FIGS.
The cutter wheel 1 of this embodiment has a disk-shaped cutter wheel main body 1a, and the inclined cutting blade surfaces 2, 2 that increase in diameter from the both axial ends toward the inner side in the axial direction on the outer peripheral surface of the wheel main body 1a. Are formed along the circumferential direction, and blade edge cutting blade surfaces 3a and 3a are formed between the inclined cutting blade surfaces 2 and 2 along the circumferential direction so as to increase in diameter toward the inside. . The blade edge cutting blade surfaces 3 a and 3 a are connected to the inclined cutting blade surfaces 2 and 2, and the blade edge cutting blade surfaces 3 a and 3 a are connected to each other on the inner side to constitute the blade edge 3.

  The inclined cutting blade surfaces 2 and 2 are inclined at a predetermined inclination angle α2 with respect to the horizontal outer peripheral surface of the wheel main body 1a, respectively, and the blade edge cutting blade surfaces 3a and 3a are respectively the same as the horizontal outer peripheral surface of the wheel main body 1a. The surface is inclined at a predetermined inclination angle α1. However, the inclination angle of the blade edge cutting blade surfaces 3a, 3a is larger than the inclination angle of the inclined cutting blade surfaces 2, 2. As a result, the angle θ1 of the blade edge 3 (intersection angle between the blade edge cutting blade surfaces 3a and 3a) is smaller than the intersection angle θ2 between the inclined cutting blade surfaces 2 and 2. Preferably, the angle θ1 is a right angle or an acute angle, and the angle θ2 is an obtuse angle (for example, 110 to 150 degrees). Further, the depth of the blade edge 3 is Y.

The operation | movement which cut | disconnects the glass plate 30 using the said cutter wheel 1 is demonstrated.
A load is applied to the cutter wheel 1 in the same manner as in the prior art to press the cutter wheel 1 against the surface of the glass plate 30 and rotate the cutter wheel 1. Thereby, the processing position on the surface of the glass plate 30 moves, and a scribe line is formed on the surface of the glass plate 30 through a loading process and an unloading process.

  FIG. 2A shows a process of loading the glass plate 30 by the cutter wheel 1. The angle of the blade edge 3 is smaller than the crossing angle of the inclined cutting blade surface 2, and the plastic deformation region 32a is deepened even when the blade edge 3 is pushed into a deep position of the glass plate 30 and a load similar to the conventional one is applied. Can be formed. In addition, a load is applied to the surface of the glass plate 30 through the inclined cutting edge surface 2, and an elastic deformation region 31a is formed on the deep side of the plastic deformation region 32a. As a result, the vertical crack 33a is formed deeply, while the formation of the horizontal crack is suppressed. After unloading, as shown in FIG. 2B, the vertical crack 33 a extending to a deep position while suppressing the occurrence of horizontal cracks is formed on the glass plate 30.

  In the above description, the inclined cutting blade surfaces and the cutting edge cutting surfaces are described with the same reference numerals, but the inclined cutting blade surfaces and the cutting edge surfaces may have different inclination angles. . The blade edge cutting surface only needs to have a larger inclination angle with respect to the inclined cutting blade surface with which it is continuous, and the size of the inclination angle with the other inclined cutting blade surface is not limited. However, it is desirable that the inclination angle be larger with respect to the other inclined cutting surface.

Moreover, you may provide the transition inclination surface 3b from which the inclination angle increases in steps as shown to Fig.3 (a) from the inclination cutting blade surface 2 to the blade edge cutting blade surface 3a. As a result, the crossing angle θ3 between the transition inclined surfaces 3b and 3b is an angle within the range of the blade edge angle θ1 and the crossing angle θ2 of the inclined cutting blade surface.
Moreover, you may provide the transition inclination surface 3c from which the inclination angle increases continuously as shown in FIG.3 (b) from the inclination cutting blade surface 2 to the blade edge cutting blade surface 3a. At this time, the crossing angle between the transition inclined surfaces 3c and 3c is an angle that changes within the range of the blade edge angle θ1 and the crossing angle θ2 of the inclined cutting blade surface.
The inclined cutting blade surface 2 to the blade edge cutting blade surface 3a may have either a shape in which the inclination angle changes stepwise or a shape in which the inclination angle changes continuously.
Further, the inclined angle may be changed stepwise or continuously on the inclined cutting surface or the cutting edge surface. In addition, the inclined cutting edge surface and the cutting edge cutting edge surface may be configured by a curved surface whose inclination angle changes continuously as a whole, but so that each function can be sufficiently achieved, Except for the transition inclined surface, all of the inclined cutting blade surface and the cutting edge surface are flat (including a stepped portion), or at least a part of one or both of the inclined cutting blade surface and the cutting edge cutting surface is flat. It is desirable to be configured.

  Moreover, in the said form, although the glass plate was shown and demonstrated as a workpiece, as for this invention, the object of a workpiece is not limited to a glass plate, Other materials, for example, ceramics, a semiconductor wafer It may be a brittle material. However, the present invention is particularly preferably applied to a glass in which horizontal cracks are likely to occur.

(Embodiment 2)
Hereinafter, another embodiment of the present invention will be described with reference to FIG.
Also in the second embodiment, as in the first embodiment, on the outer peripheral surface of the cutter wheel, the inclined cutting blade surfaces 2, 2 and the cutting edge having a larger inclination angle than the inclined cutting blade surface 2 between the inclined cutting blade surfaces. It has surfaces 3a and 3a.

  Further, in the cutter wheel of this embodiment, as shown in FIGS. 4 (a) and 4 (b), the inclined cutting blade surfaces 2a and 2a are formed with the recesses 5 ... 5 having a long hole shape at intervals in the circumferential direction. ing. The sides in the circumferential direction of the recess 5 are each formed into a curved shape that swells outward. Although the arrangement | positioning space | interval p of this recessed part 5 and 5 is not specifically limited, For example, 60-100 micrometers can be shown. Moreover, the depth of the recessed part 5 is not specifically limited as this invention. The formation method of this recessed part 5 is not specifically limited, It can form with an appropriate | suitable processing method etc.

  Also in the cutter wheel of this embodiment, as described in the above embodiment, the vertical crack can be formed deeply while suppressing the occurrence of horizontal cracks by having a cutting edge having a different inclination angle from the inclined cutting blade surface. it can. Furthermore, when the scribe line is formed, the concave portion 5 hits the glass surface over time, so that the load applied to the glass surface changes, the pushing of the blade edge is promoted, and the vertical crack can be formed deeper. At the same time, generation of horizontal cracks is suppressed. Moreover, since the recessed part is not formed in the blade edge | tip, the shape of a scribe line does not become rough and can maintain favorable shape accuracy.

  FIG. 4 (c) shows a modified example of the above-mentioned recess, and recesses 6... 6 having substantially the same dimensions in the vertical and horizontal directions are formed on the inclined cutting blade surfaces 3 and 3 at intervals in the circumferential direction. The circumferential sides of the recess 6 are each formed in a curved shape that swells toward the cutting edge.

  FIG. 4 (d) shows another modified example of the above-described concave portion, and the inclined cutting blade surfaces 3, 3 are provided with narrow groove-shaped concave portions 7 ... 7 that are elongated in the axial direction in the circumferential direction. Is formed.

Moreover, FIG.4 (e) shows the example by which the convex part 8 ... 8 was formed in the inclined cutting-blade surface at intervals in the circumferential direction.
That is, any shape of unevenness may be formed on the inclined cutting edge surface, or a mixture of these may be used. Further, the unevenness may be formed on both of the two inclined cutting blade surfaces, or may be formed only on one side. In addition, when unevenness is formed on both of the two inclined cutting blade surfaces, it may be formed on the inclined cutting blade surface at a position aligned in the circumferential direction. Two inclined cutting blade surfaces may be provided so as to be alternately positioned in the circumferential direction.

  The unevenness needs to be provided at a position close to the cutting edge surface of the inclined cutting edge surface, at least in a portion that comes into contact with the processing material when the cutter wheel is pressed against the workpiece. Is desirable.

Examples of the present invention will be described below.
In this example, the cutter wheel having the cutting edge shape of the above embodiment and the cutter wheel having the conventional cutting edge shape are assumed. There are the following three types of blade shapes.
(1) Conventional example 1 (FIG. 9): Cutting edge angle θ = 90 °
(2) Conventional example 2 (FIG. 9): Cutting edge angle θ = 150 °
(3) Invention example (FIG. 1; two-stage cutting blade surface):
Cutting edge angle θ1 = 90 °, inclined cutting edge tolerance angle θ2 = 150 °, cutting edge depth = 10 μm
Cutting edge angle θ1 = 90 °, inclined cutting edge tolerance angle θ2 = 150 °, cutting edge depth = 15 μm
Cutting edge angle θ1 = 60 °, inclined cutting edge tolerance angle θ2 = 150 °, cutting edge depth = 10 μm
Cutting edge angle θ1 = 120 °, inclined cutting edge tolerance angle θ2 = 150 °, cutting edge depth = 10 μm

  In this example, the stress state generated inside the glass during the scribing process, in which a load is applied to the cutter wheel and pressed against the glass surface to form a scribe line and then unloaded, is analyzed by an elasto-plastic analysis using the Finite Element Method. Simulated and compared.

  FIG. 5 shows a contour diagram of the plastic region and the stress distribution at the maximum scribe load by the cutter wheel of the invention example. It can be seen that a scribe line is formed by plastic deformation, and a horizontal tensile stress that generates a vertical crack immediately below the plastic region acts.

  FIG. 6 shows the horizontal stress distribution in the thickness direction of the glass plate at the maximum scribe load of the cutter wheel of the conventional example and the present invention example. It can be seen that the cutter wheel of the example of the present invention has a larger stress that generates vertical cracks than the conventional example and the cutter wheel having a cutting edge angle of 150 °. This means that the vertical crack is deeply formed as compared with the conventional example, the cutter wheel having a blade edge angle of 150 °. In the conventional example, the cutter wheel having a blade edge angle of 90 ° has the largest stress that generates a vertical crack, but the stress that generates a horizontal crack described later is large, and the possibility of a product failure is high.

FIG. 7 shows a contour diagram of the plastic region and the stress distribution at the time of scribe unloading of the cutter wheel of the present invention example shown in FIG.
FIG. 8 shows a comparison of the vertical stress distribution in the thickness direction of the glass plate at the time of scribe unloading of the cutter wheel of the conventional example and the example of the present invention.
From this figure, the cutter wheel of the example of the present invention has a much smaller vertical tensile maximum stress just below the plastic region that causes horizontal cracks than the cutter wheel of the conventional example with a blade edge angle of 90 °, and the blade angle of the conventional example is 150 °. It is about the same. This means that the horizontal crack is less likely to occur in the cutter wheel of the present invention than in the conventional cutter wheel having a cutting edge angle of 90 °.

  The present invention has been described based on the above-described embodiments and examples. However, the present invention is not limited to the contents of these descriptions, and appropriate modifications can be made without departing from the present invention. .

It is the front view which shows the cutter wheel in one Embodiment of this invention, a side view, and c section enlarged view. Similarly, it is a figure explaining the process using the cutter wheel of embodiment. Similarly, it is a partially enlarged side view showing a modified example of the cutter wheel of the embodiment. It is a figure which shows the partially expanded side view and the example of a change which show the cutter wheel in further another embodiment of this invention. It is a contour figure which shows the plastic area | region and stress distribution at the time of the scribe maximum load of the invention example in the Example of this invention. Similarly, it is a figure which shows the horizontal direction stress distribution of the glass plate thickness direction at the time of the scribe maximum load of an example of an invention and a prior art example. It is a contour figure which shows the plastic zone and stress distribution at the time of unloading of the invention example in the Example of this invention. Similarly, it is a figure which shows the horizontal direction stress distribution of the glass plate thickness direction at the time of unloading of an invention example and a prior art example. It is the front view and side view which show the conventional cutter wheel. It is a figure explaining the processing process using the conventional cutter wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutter wheel 1a Cutter wheel main body 2 Inclined cutting blade surface 3 Cutting edge 3a Cutting edge cutting blade surface 5, 6, 7 Recessed portion 8 Convex portion 30 Glass 33, 33a Vertical crack 34 Horizontal crack

Claims (6)

  On the outer peripheral surface of the disc-shaped cutter wheel main body, inclined cutting blade surfaces that increase in diameter from the two axial ends toward the inner side in the axial direction are formed along the circumferential direction, and these inclined cutting blade surfaces are inclined between the inclined cutting blade surfaces. A cutter wheel, wherein the blade edge cutting blade surfaces that have an inclination angle larger than the inclination angle of the cutting blade surface and that form a blade edge in a row with each other are formed to be continuous with the inclined cutting blade surface.   The cutter wheel according to claim 1, wherein the cutting edge has an axial width of 1 to 50 μm.   The cutter wheel according to claim 1 or 2, wherein the inclination angle increases stepwise or continuously from the inclined cutting edge surface to the cutting edge cutting edge surface.   The cutter wheel according to any one of claims 1 to 3, wherein an angle of the blade edge is a right angle or an acute angle, and an intersection angle between the inclined cutting blade surfaces is an obtuse angle.   The cutter wheel according to claim 4, wherein an angle of intersection between the inclined cutting blade surfaces is 110 to 150 °.   The cutter wheel according to any one of claims 1 to 5, wherein an uneven shape is provided on the inclined cutting blade surface at intervals in the circumferential direction.