TWI796379B - marking wheel - Google Patents

Abstract

The object of the present invention is to provide a scribing wheel that can increase the amount of penetration. The scribing wheel 1 of the present invention has a blade edge portion 20 formed on the outer peripheral portion. The blade edge portion 20 includes: a plurality of grooves 24 formed at intervals in the circumferential direction; and a ridge line portion 23 formed between the grooves 24 adjacent in the circumferential direction. The groove 24 includes a portion whose edge angle is smaller than that of the ridge portion 23 .

Description

marking wheel

The present invention relates to a marking wheel.

It is known to use a scribing wheel to form scribing lines for cutting brittle material substrates such as glass substrates. For example, the scribing wheel of Patent Document 1 has a plurality of grooves formed at a distance from each other in the circumferential direction at a blade edge portion formed on the outer peripheral portion thereof. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2010-132542

[Problem to be solved by the invention]

In scribing wheels, it is preferred that the amount of penetration increases as the ratio of the depth of the vertical cracks relative to the substrate thickness of the brittle material substrate. The object of the present invention is to provide a scoring wheel which can increase the penetration. [Technical means to solve the problem]

(1) The scribing wheel of the present invention has a blade edge portion formed on the outer peripheral portion, and the blade edge portion includes: a plurality of grooves formed at intervals in the circumferential direction; and a ridge portion formed in the aforementioned between adjacent grooves in the circumferential direction; and the groove includes a portion whose edge angle is smaller than the ridgeline portion.

The inventors of the present application focused on the relationship between the edge angle of the groove and the edge angle of the ridge, and changed the angle of the edge of the groove. The variation in the amount of penetration indicated by the ratio of the thicknesses was tested. As a result, it was found that the amount of infiltration increases when the groove includes a portion with a smaller edge angle than the ridge portion. Therefore, in the present scribing wheel, the groove includes a portion having a smaller blade edge angle than the ridge portion. Therefore, the amount of penetration can be increased.

(2) As a preferred example, in the scribing wheel described in (1), the depth of the aforementioned groove includes a part that becomes deeper from the end of the aforementioned groove in the aforementioned circumferential direction toward the central portion of the aforementioned groove, at least the end of the aforementioned groove The edge angle of the edge portion is smaller than the edge angle of the aforementioned ridge portion.

Vertical cracks are more likely to be formed when the ends of the grooves in the circumferential direction are in contact with the brittle material substrate than when the central portions of the grooves in the circumferential direction are in contact with the brittle material substrate. Also, when the edge angle is small, stress that propagates a vertical crack tends to be generated more easily than when the edge angle is large. Therefore, in this scribing wheel, since the edge angle of the end of the groove in the circumferential direction is smaller than the edge angle of the edge portion, the stress for expanding the vertical crack can be effectively increased, so the penetration can be further increased. quantity.

(3) As a preferred example, in the scribing wheel described in (2), the blade edge angle at the end of the aforementioned groove is smaller than the blade edge angle at the central portion of the aforementioned groove. Vertical cracks are more likely to be formed when the ends of the grooves in the circumferential direction are in contact with the brittle material substrate than when the central portions of the grooves in the circumferential direction are in contact with the brittle material substrate. Also, when the edge angle is small, stress that propagates a vertical crack tends to be generated more easily than when the edge angle is large. Therefore, in this scribing wheel, since the edge angle of the end of the groove in the circumferential direction is made smaller than the edge angle of the central portion of the groove in the circumferential direction, the stress for extending the vertical crack can be effectively increased, Therefore, the amount of penetration can be further increased.

(4) As a preferred example, in the scribing wheel described in (2), the edge angle of the groove becomes smaller from the edge of the groove toward the center of the groove. Therefore, the same effect as the above (3) can be obtained.

(5) As a preferable example, in the scribing wheel described in (2), the edge angle of the center portion of the groove is greater than or equal to the edge angle of the ridge portion.

[Effect of Invention] The scoring wheel of the present invention can increase the amount of penetration.

The scribing wheel 1 of this embodiment will be described with reference to FIGS. 1 to 7 . The scribing wheel 1 is used for breaking a substrate formed of a brittle material such as a glass substrate or a ceramic substrate, that is, a brittle material substrate. Scribing lines are formed on the surface of the brittle material substrate by rolling the scribing wheel 1 while pressing the surface of the brittle material substrate with a specific load.

The scribing wheel 1 is made of sintered diamond (Poly Crystalline Diamond), cemented carbide, single crystal diamond, polycrystalline diamond, or the like. The scribing wheel 1 may be a substrate in which a film of a hard material such as diamond is applied to a substrate such as cemented carbide.

1 mm以上且

20 mm以下之範圍。本實施形態之劃線輪1之外徑為

2 mm。又，劃線輪1之厚度之一例為0.64 mm。As shown in FIG. 1( a ), the scribing wheel 1 has a disc-shaped body portion 10 and a blade tip portion 20 with a V-shaped cross section. The blade edge portion 20 is formed on the outer peripheral portion of the scribing wheel 1 . The main body portion 10 is a portion radially inward of the blade edge portion 20 in the scribing wheel 1 . The body portion 10 is integrally formed with the blade tip portion 20 . Furthermore, the so-called V-shaped cross section refers to the cross section of the scribing wheel 1 cut on a plane along the thickness direction of the scribing wheel 1 (hereinafter referred to as "thickness direction DT"), toward the outer peripheral edge of the scribing wheel 1. Tapered shape (refer to Figure 1(b)). The outer diameter of marking wheel 1 is

1 mm or more and

The range below 20 mm. The outer diameter of the scribing wheel 1 of the present embodiment is

2mm. Also, an example of the thickness of the scribing wheel 1 is 0.64 mm.

An insertion hole 13 penetrating through the body portion 10 in the thickness direction DT is formed at the center portion of the body portion 10 . A support pin (not shown) for rotatably supporting the scribing wheel 1 is inserted into the insertion hole 13 . As shown in FIG. 1( b ), the main body 10 has a first side surface 11 for forming one end of the insertion hole 13 and a second side surface 12 for forming the other end of the insertion hole 13 .

The blade edge portion 20 has a first slope 21 and a second slope 22 which are two slopes forming a V-shaped cross section. The first slope 21 connects the first side surface 11 and the front end of the blade edge portion 20 , and the second slope 22 connects the second side surface 12 and the front end of the blade edge portion 20 . In other words, the line of intersection between the first slope 21 and the second slope 22 forms a ridgeline at the front end of the blade edge portion 20 .

As shown in FIG. 1( b ), in the thickness direction DT, the center position of the scribing wheel 1 in the thickness direction DT and the front end position of the blade edge portion 20 are equal to each other. Under the section observation of the scribing wheel 1, the first angle θ1 formed by the line segment CL along the direction perpendicular to the thickness direction DT and the first slope 21, and the second angle formed by the line segment CL and the second slope 22 θ2 are equal to each other.

As shown in FIG. 2( a ), the scribing wheel 1 has a plurality of grooves 24 spaced apart from each other along the circumferential direction of the scribing wheel 1 (hereinafter referred to as "circumferential direction DC") at the front end of the blade edge portion 20. . The number of slots 24 can be set arbitrarily. The number of grooves 24 in this embodiment is 150. Between the adjacent grooves 24 in the circumferential direction DC, the first slope 21 and the second slope 22 and the ridge line portion 23 serving as the line of intersection thereof are formed. The outer peripheral edge of the ridge portion 23 and the outer peripheral edge of the groove 24 form a blade tip 25 . The blade edge portion 20 is formed by alternating ridges 23 and grooves 24 at equal pitches. The angle formed by the first inclined surface 21 and the second inclined surface 22 of the ridge portion 23 , that is, the blade edge angle θr is in the range of 90° to 160°, preferably 100° to 150°. When the edge angle θr is 90° or more, surface peeling and leading are less likely to occur on the brittle material substrate, and if it is 160° or less, the above defects are less likely to occur. The edge angle θr of this embodiment is 120° (see FIG. 4 ).

As shown in FIG. 2( b ), the groove 24 has a shape concaved in a curved shape from the outer peripheral portion of the blade edge portion 20 . Also, the groove 24 has a first groove slope 21A corresponding to the first slope 21 and a second groove slope 22A corresponding to the second slope 22, and the outer periphery of the intersection of the first groove slope 21A and the second groove slope 22A includes A blade tip 25 continuous with the ridge portion 23 . The groove 24 has a portion that becomes deeper from the end of the groove 24 in the circumferential direction DC toward the center of the groove 24 . The groove 24 in this embodiment becomes deeper from the end of the groove 24 on the circumferential direction DC toward the center of the groove 24 . The depth H of the groove 24 is defined as the distance between the ridge line portion 23 in the radial direction of the scribing wheel 1 and the deepest portion of the groove 24 . The width WD of the groove 24 of the ridge portion 23 is defined as the distance between both end edges of the groove 24 in the circumferential direction DC. The depth H of the groove 24 of the ridge portion 23 is the load that presses the scribing wheel 1 toward the brittle material substrate in consideration of the material and thickness of the brittle material substrate when scribing the brittle material substrate (hereinafter referred to as "scribing load") ), and the quality of the scribing line formed by scribing and the brittle material substrate after breaking, for example, it is not less than 0.5 μm and not more than 6.0 μm. The depth of the groove 24 of the blade edge portion 20 in this embodiment is 5.5 μm. The width WD of the groove 24 in the circumferential direction DC is not less than 2.0 μm and not more than 35 μm. If the thickness of the brittle material substrate is less than 0.7 mm, the width WD of the groove 24 of the blade edge 25 is preferably not less than 2.0 μm and not more than 15 μm. The width WD is preferably not less than 10 μm and not more than 30 μm. The width WD of the groove 24 of the blade tip 25 in this embodiment is 24 μm.

Such grooves 24 are formed by irradiating laser light from a laser irradiation device in a state where the insertion hole 13 of the scribing wheel 1 is attached to the rotation shaft of a motor (not shown). The irradiation direction of the laser light is the radial direction of the scribing wheel 1 . The laser light is focused on the side closer to the laser irradiation device than the ridge portion 23 of the scribing wheel 1 . In the laser irradiating device, an irradiating portion that irradiates laser light is movable relative to the scribing wheel 1 in the thickness direction DT. On the other hand, the irradiation part does not change the distance from the blade edge part 20 in the radial direction of the scribing wheel 1 . Therefore, at the central position of the thickness direction DT of the scribing wheel 1, the distance between the irradiation portion and the blade edge portion 20 is the smallest, and as the distance between the central position along the thickness direction DT and the thickness direction DT of the scribing wheel 1, the irradiation The distance between the blade tip portion and the blade tip portion 20 becomes longer.

If the groove 24 is formed in this way, the area irradiated by the laser light at the ridge line portion 23 of the scribing wheel 1 is the smallest, and the area irradiated by the laser light increases as the distance from the front end of the blade tip portion 20 in the thickness direction DT increases. . Therefore, as shown in FIG. 3 , the width WD of the groove 24 is smallest at the front end position of the blade tip 20 , that is, at the groove 24 of the blade tip 25 , and becomes larger as it moves away from the blade tip 25 in the thickness direction DT. .

As shown in Figure 4 and Figure 5, the shape of the end of the groove 24 on the circumferential direction DC (hereinafter referred to as the end of the groove 24) and the central part of the groove 24 on the circumferential direction DC (hereinafter referred to as the groove for short) 24 central part) shapes are different from each other.

As shown in FIG. 4, the edge angle of the end of the groove 24, that is, the first groove edge angle θg1 is smaller than the edge angle θr. The first groove edge angle θg1 is preferably about 2 to 10° smaller than the edge angle θr. On the other hand, as shown in FIG. 5 , the edge angle of the central portion of the groove 24 , that is, the second groove edge angle θg2 is larger than the edge angle θr. That is, the first groove edge angle θg1 is smaller than the second groove edge angle θg2.

Here, the end portion of the groove 24 is a portion adjacent to the ridge portion 23 in the circumferential direction DC. One end of the groove 24 in the circumferential direction DC is defined as starting from the groove starting point of the groove 24 of the ridge portion 23 (the position of the line segment C in FIG. The position of line segment E in Figure 3). In addition, the same regulation applies to the other end portion of the groove 24 in the circumferential direction DC. In this way, the first groove edge angle θg1 is defined as the edge angle of the portion from the position of the line segment C to the position of the line segment E of the groove 24 . In this embodiment, the distance between line segment C and line segment E in the circumferential direction DC is 5.0 μm. The distance from the end of the groove 24 defined by the first groove edge angle θg1 is preferably about 10 to 30% on one side of the width WD of the groove 24 . The groove edge angle θg is defined by the angle formed by the portion of the first slope 21 corresponding to the groove 24 , that is, the first groove slope 21A, and the portion of the second slope 22 corresponding to the groove 24 , that is, the second groove slope 22A. The first groove edge angle θg1 is defined by the angle formed by the first groove slope 21A at the end of the groove 24 and the second groove slope 22A at the end of the groove 24 . The second groove edge angle θg2 is defined by the angle formed by the first groove slope 21A at the center of the groove 24 and the second groove slope 22A at the center of the groove 24 .

Furthermore, the first groove edge angle θg1 and the second groove edge angle θg2 can be changed arbitrarily. As an example, the second groove edge angle θg2 may be equal to or smaller than the edge angle θr.

(Example) In order to evaluate the performance of the scribing wheel 1, the scribing wheel of Example 1 and Example 2 and the scribing wheel of Comparative Example 1 and Comparative Example 2 were used to confirm the relationship between the scribing load and the amount of penetration. Furthermore, the amount of penetration is expressed as a percentage (%) of the ratio of the depth of the vertical crack to the thickness of the brittle material substrate.

For each of the scribing wheels of Example 1, Example 2, Comparative Example 1, and Comparative Example 2, the blade edge angle difference θd was measured at each measurement position of 2.5 μm based on the starting position of the groove 24 . Specifically, the positions corresponding to line segment A to line segment H in FIG. 3 are used as measurement positions. Line A is a position away from the starting position of the groove 24 by 5 μm toward the side of the ridge portion 23 , and line segment B is a position away from the starting position of the groove 24 toward the edge 25 by 2.5 μm. Both the line segment A and the line segment B are line segments passing through the ridge portion 23 . The line segment C is the starting position of the groove 24, the line segment D is the position away from the starting position of the groove 24 towards the side of the groove 24 by 2.5 μm, the line segment E is the position away from the starting position of the groove 24 towards the side of the groove 24 by 5.0 μm, and the line segment F is The position away from the starting position of the groove 24 toward the side of the groove 24 by 7.5 μm, the line segment G is the position away from the starting position of the groove 24 toward the side of the groove 24 by 10.0 μm, and the line segment H is 12.5 μm away from the starting position of the groove 24 toward the side of the groove 24 The position of μm. Any of the line segment C to the line segment H is a line segment passing through the outer periphery of the groove 24 . 6 is a graph showing the relationship between line segment A, which is the measurement position of the scribing wheel in Example 1, Example 2, Comparative Example 1, and Comparative Example 2, and the blade edge angle difference θd between line segment B to line segment H.

2 mm、刃尖角θr為120°、槽之數目為150個、槽之深度H為5.5 μm者。使用圖6針對實施例1、實施例2、比較例1、及比較例2之劃線輪之具體之槽形狀進行說明。Also, the marking wheels of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 each use an outer diameter

2 mm, the edge angle θr is 120°, the number of grooves is 150, and the groove depth H is 5.5 μm. The specific groove shapes of the scribing wheels of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 will be described using FIG. 6 .

6 is a graph showing the blade edge angle difference θd at each measurement position of the scribing wheels of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 based on the edge angle θr at the position of line segment A. From line segment C to line segment E, the edge angle difference θd of the scribing wheels of Example 1 and Example 2 becomes a negative value, while on the other hand, the edge angles of the scribing wheels of Comparative Example 1 and Comparative Example 2 The difference θd becomes a positive value. If described in detail, at the position of line segment C, the groove edge angle θg of the scribing wheel in embodiment 1 is about 3° smaller than the edge angle θr, and the groove edge angle θg of the scribing wheel in embodiment 2 is smaller than the edge angle θg. The angle θr is about 2.5° smaller. The groove edge angle θg of the scribing wheel of Comparative Example 1 is about 0.2° greater than the edge angle θr, and the groove edge angle θg of the scribing wheel of Comparative Example 2 is about 0.1° than the edge angle θr. At the position of the line segment D, the groove edge angle θg of the scribing wheel in Example 1 is about 5.5° smaller than the edge angle θr, and the groove edge angle θg of the scribing wheel in Example 2 is about 4.5° smaller than the edge angle θr °. In the scribing wheel of Example 1 and Example 2, the groove edge angle θg at the position of the line segment D becomes the minimum with respect to the edge angle θr. Also, the groove edge angle θg of the scribing wheel of Comparative Example 1 is about 1° greater than the edge angle θr, and the groove edge angle θg of the scribing wheel of Comparative Example 2 is about 0.8° greater than the edge angle θr. At the position of line segment E, the groove edge angle θg of the scribing wheel in Example 1 is about 0.5° smaller than the edge angle θr, and the groove edge angle θg of the scribing wheel in Example 2 is about 1 smaller than the edge angle θr °. The groove edge angle θg of the scribing wheel of Comparative Example 1 is about 3° greater than the edge angle θr, and the groove edge angle θg of the scribing wheel of Comparative Example 2 is about 3.5° than the edge angle θr.

At the position of line segment F, the edge angle difference θd of the scribing wheel of Example 2 becomes a negative value, while on the other hand, the edge angle difference θd of the scribing wheels of Example 1, Comparative Example 1, and Comparative Example 2 become a positive value. If described in detail, at the position of line segment F, the groove edge angle θg of the scribing wheel in embodiment 1 is about 0.1° larger than the edge angle θr, and the groove edge angle θg of the scribing wheel in embodiment 2 is larger than the edge angle θr is about 1° smaller. The groove edge angle θg of the scribing wheel of Comparative Example 1 is about 8° greater than the edge angle θr, and the groove edge angle θg of the scribing wheel of Comparative Example 2 is about 7.5° than the edge angle θr.

At the line segment G, the edge angle difference θd of the scribing wheel of Example 2 is a negative value, while the edge angle difference θd of the scribing wheels of Comparative Example 1 and Comparative Example 2 is a positive value. In addition, the edge angle difference θd of the scribing wheel of Example 1 was 0°. If described in detail, the groove edge angle θg of the scribing wheel of the second embodiment is about 0.2° smaller than the edge angle θr. The groove edge angle θg of the scribing wheel in Comparative Example 1 is about 8° greater than the edge angle θr, and the groove edge angle θg of the scribing wheel in Comparative Example 2 is about 10° greater than the edge angle θr.

In the position of line segment H, the edge angle difference θd of the scribing wheels of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 is a positive value. The groove edge angle θg of the scribing wheel in Example 1 is about 2° greater than the edge angle θr, the groove edge angle θg of the scribing wheel in Example 2 is about 1° than the edge angle θr, and the scribing wheel of Comparative Example 1 The groove edge angle θg of the wheel is about 9° greater than the edge angle θr, and the groove edge angle θg of the scribing wheel of Comparative Example 2 is about 8° than the edge angle θr.

The groove edge angle θg, which is the edge angle of the groove 24, is calculated as follows using, for example, a laser microscope. That is, the laser microscope irradiates the laser in the radial direction of the scribing wheel 1, and by measuring the distance between the laser microscope and the scribing wheel 1, the groove in the direction perpendicular to the direction along the edge portion 20 is obtained. 24 outlines. Then, the groove edge angle θg is calculated based on the acquired profiles of the first groove slope 21A and the second groove slope 22A of the groove 24 . In this example, VK-X100 from KEYENCE was used as a laser microscope.

In the relationship between the marking load and the penetration amount, measure the penetration amount when the marking load is changed to 0.09 MPa, 0.10 MPa, 0.11 MPa, 0.13 MPa, 0.15 MPa, 0.17 MPa, 0.19 MPa, 0.21 MPa, and 0.23 MPa .

As shown in Figure 7, if the scribing load is 0.09 MPa, the penetration rate of the scribing wheel of Example 1 is about 75%, the penetration rate of the scribing wheel of Example 2 is about 76%, and the scribing wheel of Comparative Example 1 The penetration amount of the scribing wheel was about 64%, and the penetration amount of the scribing wheel of Comparative Example 2 was about 66%. If the scribing load is 0.10 MPa, the penetration of the scribing wheel of Example 1 and Example 2 is about 78% respectively, the penetration of the scribing wheel of Comparative Example 1 is about 60%, and the scribing wheel of Comparative Example 2 The penetration rate is about 74%. If the marking load is 0.11 MPa, the penetration of the marking wheel of Example 1 is about 82%, the penetration of the marking wheel of Example 2 is about 81%, and the penetration of the marking wheel of Comparative Example 1 is about 82%. 77%, the penetration rate of the scribing wheel of Comparative Example 2 was about 74%. If the marking load is 0.13 MPa, the penetration of the marking wheel of embodiment 1 and embodiment 2 is about 84%, the penetration of the marking wheel of comparative example 1 is about 79%, and the penetration of the marking wheel of comparative example 2 is about 84%. Penetration was about 77%. If the marking load is 0.15MPa, the penetration of the marking wheel of embodiment 1 and embodiment 2 is about 86%, the penetration of the marking wheel of comparative example 1 is about 81%, and the penetration of the marking wheel of comparative example 2 is about 86%. Penetration was about 83%. If the scribing load is 0.17 MPa, the penetration of the scribing wheels of Example 1 and Example 2 is about 87%, and the penetration of the scribing wheels of Comparative Example 1 and Comparative Example 2 is about 85%. If the scribing load is 0.19 MPa, the penetration rate of the scribing wheel of Example 1, Example 2, and Comparative Example 2 is about 90%, and the penetration rate of the scribing wheel of Comparative Example 1 is about 86%. If the marking load is 0.21 MPa, the penetration rate of the marking wheel of embodiment 1 is about 92%, the penetration rate of the marking wheel of embodiment 2 is about 93%, and the penetration rate of the marking wheel of comparative example 1 and comparative example 2 is about 92%. Penetration was about 90%. If the marking load is 0.23 MPa, the penetration of the marking wheels of Example 1 and Example 2 is about 95%, and the penetration of the marking wheels of Comparative Example 1 and Comparative Example 2 is about 93%.

As shown in FIG. 7 , it was confirmed that the scribing wheels of Example 1 and Example 2 had 5 to 10% more penetration than the scribing wheels of Comparative Example 1 and Comparative Example 2. In particular, it was confirmed that the penetrating amounts of the scribing wheels of Examples 1 and 2 were significantly larger than those of the scribing wheels of Comparative Example 1 and Comparative Example 2 in the range of low scribing loads.

According to this embodiment, the following effects can be obtained. (1) Since the edge angle θg of the groove is smaller than the edge angle θr, the penetration amount of the brittle material substrate increases. Thereby, the brittle material substrate can be easily broken. In addition, since the scribing load for obtaining the desired depth of the vertical crack can be reduced, it is possible to suppress the occurrence of failure in scribing of the preceding brittle material substrate due to the increase in the scribing load.

(2) The case where the end portion of the groove 24 is in contact with the brittle material substrate is more likely to form a vertical crack than the case where the center portion of the groove 24 is in contact with the brittle material substrate. Also, the case where the groove edge angle θg is small is more likely to generate stress that propagates the vertical crack than the case where the groove edge angle θg is large. Therefore, in this embodiment, the first groove edge angle θg1 is made smaller than the second groove edge angle θg2. Thereby, since the stress for expanding the vertical crack can be effectively increased, the amount of penetration can be further increased.

(variation example) The description of the above-mentioned embodiment is an illustration of the form that the scribing wheel of the present invention can take, and is not intended to limit the form. The scribing wheel of the present invention can take, for example, a modification example of the above-mentioned embodiment shown below, and a form in which at least two modifications that do not contradict each other are combined. In the following modified examples, the same symbols as those in the above-mentioned embodiment are given to the parts that are in common with those of the above-mentioned embodiment, and the description thereof will be omitted.

・The groove 24 of the scribing wheel 1 can be provided so that the edge angle θg of the groove 24 gradually decreases from the end of the groove 24 toward the center of the groove 24 . The effect of the above-mentioned embodiment can also be obtained by this structure.

・At the end of the groove 24, the groove 24 may be provided in such a way that the groove edge angle θg gradually decreases from the groove starting point (the position of the line segment C in FIG. 3 ) toward the position of the line segment E in FIG. 3 . The effect of the above-mentioned embodiment can also be obtained by this structure.

・The groove edge angle θg of the groove 24 other than the edge portion of the groove 24 may be greater than or equal to the edge angle θr. That is, it can be formed such that the first groove edge angle θg1 is smaller than the edge angle θr only at the end of the groove 24 . The effect of the above-mentioned embodiment can also be obtained by this structure.

・The shape of the groove 24 in the depth direction can be changed arbitrarily. As an example, the groove 24 may have a shape including a flat portion at the bottom. ・The shape of the blade edge portion 20 can be changed arbitrarily. As an example, in the thickness direction DT, the position of the ridge portion 23 and the center position of the thickness direction DT of the scribing wheel 1 may be different from each other.

1‧‧‧Scribing wheel 1b-1b‧‧‧Line 10‧‧‧Body Department 11‧‧‧1st side 12‧‧‧The second side 13‧‧‧Insertion hole 20‧‧‧Blade tip 21‧‧‧1st slope 21A‧‧‧The slope of the first slot 22‧‧‧The second slope 22A‧‧‧The slope of the second groove 23‧‧‧edge line 24‧‧‧slot 25‧‧‧Blade tip A～H‧‧‧Line segment CL‧‧‧Line segment DC‧‧‧Zhou Xiang DT‧‧‧thickness direction H‧‧‧(groove) depth/line segment WD‧‧‧(groove) width θ1‧‧‧1st angle θ2‧‧‧The second angle θg‧‧‧groove edge angle θg1‧‧‧The first groove edge angle θg2‧‧‧The second groove edge angle θr‧‧‧tip angle

Fig. 1(a) is a side view of the scribing wheel of the first embodiment, and Fig. 1(b) is a cross-sectional view of line 1b-1b of Fig. 1(a). Fig. 2 is an enlarged view of a portion of the blade tip of the scribing wheel in Fig. 1, Fig. 2(a) is a perspective view, and Fig. 2(b) is a side view. Fig. 3 is a plan view of a part of the blade tip. Fig. 4 is a cross-sectional view of the end of the groove of the blade tip. Fig. 5 is a cross-sectional view of the central portion of the groove of the blade tip. Fig. 6 is a diagram showing the position of the groove of the blade edge, and the relationship between the angle difference between the blade edge angle of the groove corresponding to the position and the edge angle of the ridge line portion of the blade edge. Fig. 7 is a graph showing the relationship between the scribe load and the amount of penetration.

1‧‧‧Scribing wheel

10‧‧‧Body Department

11‧‧‧1st side

12‧‧‧The second side

20‧‧‧Blade tip

21‧‧‧1st slope

21A‧‧‧The slope of the first slot

22‧‧‧The second slope

22A‧‧‧The slope of the second groove

23‧‧‧edge line

24‧‧‧slot

25‧‧‧Blade tip

DT‧‧‧thickness direction

θ g‧‧‧groove edge angle

θg1‧‧‧The first groove edge angle

θr‧‧‧tip angle

Claims (2)

A scribing wheel having a blade edge portion formed on an outer peripheral portion, and the blade edge portion includes: a plurality of grooves formed at intervals in the circumferential direction; and ridge portions formed on opposite sides in the circumferential direction Between the adjacent aforementioned grooves; the aforementioned groove includes a part whose edge angle is smaller than the aforementioned ridge line; the aforementioned groove includes a part whose depth becomes deeper from the end of the aforementioned groove in the aforementioned circumferential direction toward the central portion of the aforementioned groove; the end of the aforementioned groove It is the range of 10~30% on one side from the starting point of the aforementioned groove relative to the width of the aforementioned groove in the aforementioned circumferential direction; The sharp edge of the central part of the groove. The scribing wheel according to claim 1, wherein the edge angle of the central portion of the groove is greater than or equal to the edge angle of the ridge portion.

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