JP2012176472A - Cutting blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting blade that can moderate the anisotropy of a filler added to a bond part, and have an improved wear resistance and cutting performance, and prevent metal burr from being produced.SOLUTION: The cutting blade includes at least one layer, and has, as the filler disposed within the bond part 2 in a dispersed manner, the filler 4 of a three-dimensional crystal structure in which needle-like parts extend in four directions from the center of a tetrahedron to each tip of the needle-like parts. In the filler 4 of the three-dimensional crystal structure, the length of needle-like parts is within the range of 0.1 μm to 100 μm. The filler 4 of the three-dimensional crystal structure has a crystal structure of zinc oxide.

Description

  The present invention relates to a cutting blade used for cutting various electronic material parts such as a semiconductor device.

As electronic material parts manufactured by cutting with a cutting blade, in addition to those that are cut and divided from a semiconductor wafer like semiconductor elements and then mounted on a lead frame and resin molded, for example, the following are known: It has been.
(A) Like a so-called QFN (quad flat non-leaded package), a large number of elements are mounted on a lead frame at once and molded together, and then cut into pieces. Electronic material parts to be manufactured.
(B) Like an IrDA (Infrared Data Communication Association) standard optical transmission module (hereinafter simply abbreviated as IrDA), Ni, Au, Cu are formed on the inner peripheral surface of a through hole formed in a substrate made of glass epoxy resin. An electronic material component that has a substrate plated with the above and is separated into pieces by cutting.
In cutting such electronic material parts, for example, QFN cuts highly ductile metal lead frames, such as Cu, which are arranged at intervals in the molding resin. There is a problem in that metal burrs such as the lead frame are likely to occur in the direction and rotation direction.

  As cutting blades that suppress the generation of metal burrs, the following Patent Document 1 proposes a whisker added in a cured resin, or Patent Document 2 proposes a WC powder added in a predetermined amount in a cured resin. Has been.

Japanese Patent Laid-Open No. 1-115574 JP 2006-62009 A

By the way, in the cutting blade in which the whisker is added to the above-described cured resin or the cutting blade in which the WC powder is added, the whisker added in the cured resin is arranged with directionality, Although it has relatively strong wear resistance, it has a drawback that strong wear resistance cannot be obtained in other directions, and good wear resistance as a whole cannot be obtained.
In particular, in a cutting blade molded by using the doctor blade method, the direction of arrangement of whiskers or the like in the cured resin is determined in one direction, and anisotropy appears remarkably.
In addition, the above-described cutting blade has a drawback that the dimensional accuracy as a product is lowered due to the shrinkage rate of the resin in a specific direction after molding, and the desired cutting performance cannot be obtained. There is.

  The present invention has been made under such a background. The anisotropy of the filler added in the bond portion is relaxed, and the wear resistance and the cutting performance can be improved. An object of the present invention is to provide a cutting blade that can be suppressed.

  The cutting blade according to the present invention is a cutting blade having a layer shape of at least one layer, and is bonded to the bond portion, the abrasive grains dispersed in the bond portion, and distributed in the bond portion. A filler having a three-dimensional crystal structure in which needle-like portions extend in four directions from the center of the tetrahedron toward each vertex.

According to the cutting blade configured as described above, the needle-like portion extends in all directions from the center of the tetrahedron toward each vertex, and has a filler having a three-dimensional crystal structure that approximates a so-called tetrapot. The filler of this structure has no directionality and the overall length and width are not changed when viewed from any direction.
For this reason, the bond portion to which such a filler is added is relaxed in anisotropy, and can secure substantially the same wear resistance in any direction, resulting in excellent wear resistance. It becomes. Moreover, in the bonded part after molding, a situation in which the shrinkage rate in a specific direction becomes high can be avoided, and the dimensional accuracy as a product can be improved. Accordingly, the cutting performance is improved and the generation of burrs can be suppressed.

  Here, in addition to the filler having a three-dimensional crystal structure, the filler may include a powdery filler having a hardness higher than that of the filler having the three-dimensional crystal structure. In such a cutting blade, new abrasive grains are always exposed when the bond portion is appropriately worn, thereby ensuring good cutting over a long period of time. If the bond part has only a filler with a three-dimensional crystal structure and does not have a powdery filler with relatively high hardness, the wear of the bond part proceeds more than necessary, and the tool life is shortened. End up. Here, as the filler, in addition to the filler having a three-dimensional crystal structure, a powdery filler having a hardness higher than that of the filler having the three-dimensional crystal structure is used, so that the progress of wear of the bond portion can be appropriately suppressed. Thus, as described above, the cutting performance is improved and the generation of burrs is suppressed, and the life can be extended.

  In the filler having the three-dimensional crystal structure, the length of the needle-like portion may be in the range of 0.1 μm to 100 μm. If the length of the needle-shaped part is less than 0.1 μm, the size as a filler cannot be secured, and it is difficult to supplement the mechanical strength, which is an effect when the filler is added. Become. Further, when the length of the needle-shaped part exceeds 100 μm, the needle-shaped part itself is easily damaged, and for example, the needle-shaped part may be bent or bent when added to the bond part or at the time of subsequent molding. Yes, it is difficult to obtain the advantage of the three-dimensional crystal structure.

  The filler having the three-dimensional crystal structure may be made of a metal oxide crystal structure. With the metal oxide crystal structure, the aforementioned three-dimensional crystal structure can be easily obtained. For example, by performing an oxidation heat treatment on zinc in a predetermined atmosphere, it is possible to easily obtain a three-dimensional crystal structure in which needle-shaped portions extend in four directions from the center of the tetrahedron toward each vertex.

The filler of the metal oxide crystal structure includes a filler having a shape different from the three-dimensional crystal structure in addition to the filler of the three-dimensional crystal structure, and the filler of the three-dimensional crystal structure and the three-dimensional crystal structure The volume ratio with the filler having a different shape may be in the range of 10:90 to 90:10.
Many fillers of metal oxide crystal structures are easily damaged, and even if the shape changes due to, for example, a needle-like part being broken, a filler with a three-dimensional crystal structure, and a three-dimensional crystal structure If the volume ratio of the filler to the filler having a different shape is in the range of 10:90 to 90:10, the function of relaxing the anisotropy that is a feature of the filler having a three-dimensional crystal structure can be sufficiently exhibited.

  A silane coupling agent may be mixed in the bond portion. When there is a fine powdery filler such as WC in the bond part, these fillers tend to be unevenly distributed locally in the bond part. If a silane coupling agent is mixed, this silane cup Since the ring agent is interposed between the filler and the bond part, the local uneven distribution of the fine powdery filler is eliminated, and the filler can be uniformly distributed in the bond part.

  The surface of the filler having the three-dimensional crystal structure may be coated with a silane coupling agent. Fine irregularities are formed on the surface of the filler having a three-dimensional crystal structure, and the resin in the bond part is less likely to enter the bottom of the depressions. However, if the surface of the filler having the three-dimensional crystal structure is pre-coated with a silane coupling agent, the wettability of the filler surface having the three-dimensional crystal structure is improved and the resin of the bond portion is sufficiently blended. For this reason, the resin in the bond portion penetrates into the recess on the surface of the filler having the three-dimensional crystal structure. As a result, the holding power of the bond portion with respect to the filler having the three-dimensional crystal structure is increased, and the filler with the three-dimensional crystal structure can be prevented from dropping off from the bond portion.

The volume percentage of the filler of the crystal structure of the metal oxide in the bond part without abrasive grains may be set to 1 to 40%.
In this case, if the volume percentage of the filler of the metal oxide crystal structure is set to 1 to 40%, the function of the three-dimensional crystal structure of the metal oxide crystal structure, that is, anisotropic It is possible to sufficiently exhibit the function of relieving the wear, so that the wear resistance and cutting performance can be improved and the occurrence of metal burrs can be suppressed.

  According to the cutting blade of the present invention, the anisotropy of the filler added in the bond portion can be relaxed, the wear resistance and the cutting performance can be improved, and the occurrence of metal burrs can be suppressed.

It is a side view of the blade for cutting which shows one embodiment of the present invention. It is an expanded sectional view of the outer periphery part of the thin blade abrasive grain layer in the blade for cutting | disconnection of embodiment shown in FIG. FIG. 2 is a perspective view showing various types of zinc oxide crystal structures used in the cutting blade of the embodiment shown in FIG. 1. It is sectional drawing of QFN cut | disconnected by the Example and Comparative Examples 1-2 of this invention. It is sectional drawing of the IrDA board | substrate cut | disconnected by the Example and Comparative Examples 1-2 of this invention.

  1 to 3 show an embodiment of the present invention, FIG. 1 is a side view of a cutting blade, and FIG. 2 is an enlarged view of an outer peripheral edge of a thin blade abrasive grain layer in the cutting blade shown in FIG. FIG. 3 is a perspective view showing various types of zinc oxide crystal structures used in the cutting blade of the embodiment shown in FIG.

As shown in FIG. 1, the cutting blade according to the present embodiment has an annular shape centering on the axis O and a thin plate shape with a thickness of about 0.05 to 0.5 mm, as shown in FIG. It is formed by the thin blade abrasive grain layer 1 and is used for cutting an electronic component material having a metal material in a resin such as QFN or IrDA described above.
The inner peripheral portion of the cutting blade is attached to the main shaft of the cutting device and rotated around the axis O while being sent in a direction perpendicular to the axis O, so that the outer peripheral edge of the thin blade abrasive grain layer 1, that is, the thickness The outer peripheral surface 1A having an extremely small width, the outer peripheral side of both side surfaces 1B, and both circumferential edge portions 1C where the outer peripheral surface 1A intersects both side surfaces 1B are cut.

  The thin blade abrasive grain layer 1 is made of a resin binder phase (bond part) 2 made of a synthetic resin such as a phenol resin or a polyimide resin, an abrasive grain 3 such as diamond or cBN, and a crystal structure of zinc oxide. The filler 4 and the powdery filler 5 made of, for example, WC having a hardness higher than that of the filler 4 having a crystal structure of zinc oxide are dispersed substantially uniformly and held.

Here, as the filler 4 made of a zinc oxide crystal structure, there are various shapes as shown in FIGS. FIG. 3A shows a filler 4a having a three-dimensional crystal structure in which needle-like portions 4aa extend from the center of a regular tetrahedron or a simple tetrahedron toward each vertex. FIG. 3B shows a filler 4b having a shape in which one of the four needle-like portions 4aa is broken from the root in the filler 4a having the three-dimensional crystal structure. FIG. 3 (c) shows a filler 4c having a shape in which two of the four needle-like portions 4aa are broken from the root in the filler 4a having the three-dimensional crystal structure. FIG. 3D shows a filler 4d formed in a plate shape.
In addition, there is a simple needle-shaped filler in which the tip of the needle-shaped portion 4aa in the filler 4a having the three-dimensional crystal structure is bent.

The filler 4a having a three-dimensional crystal structure in which needle-shaped portions extend in four directions from the center of the regular tetrahedron or a simple tetrahedron toward each vertex is a single crystal obtained by subjecting zinc to an oxidation heat treatment in a predetermined atmosphere. It is. The filler 4a has an average fiber length of 10 μm, a specific gravity of 5.78, a bulk specific gravity of 0.1, a melting point of 2000 ° C., a sublimation point of 1720 ° C., and a thermal expansion coefficient of 3.18 ×. It has a property of 10 ^-6 ° C.

Here, in the filler 4a having the three-dimensional crystal structure, the length of the acicular portion 4aa is in the range of 0.1 μm to 100 μm.
Further, among the fillers 4 made of the zinc oxide crystal structure, the volume ratio between the filler 4a having the three-dimensional crystal structure and fillers (4b, 4c, 4d) having other shapes made of the zinc oxide crystal structure is: It is set in the range of 10:90 to 90:10.

In the cutting blade, the volume percentage of the filler 4 of the metal oxide crystal structure in the resin binder phase 2 without the abrasive grains 3 is set to 1 to 40%, more preferably 10%. It is set to ~ 20%.
The powdery filler 5 made of WC has an average particle diameter of about 0.1 to 5 μm, a Mohs hardness of about 8, and a Mohs hardness of about 5 to 6 having the three-dimensional crystal structure. The hardness is higher than that of the filler 4a.

The cutting blade having the above structure is manufactured as follows.
First, for example, a predetermined amount of phenol resin is weighed, and 10 ml of IPA solvent is added to dissolve the phenol resin. Next, the filler 4 made of a dissolved resin solution, a silane coupling agent, and a zinc oxide crystal structure or a powdery filler 5 made of WC having a higher hardness than the filler 4 made of a three-dimensional crystal structure is added. Then, for example, a sheet having a thickness of 0.3 mm is formed by the doctor blade method.
Next, after the sheet is dried, a disk-shaped blade having a diameter of 70 mm is cut out from the sheet, and the disk-shaped blade is compression-molded by a hot press. The molding conditions are a hot plate 200 ° C., 180 ° C. × 30 minutes, and a pressure 12.7 MPa.
A cutting blade having a desired shape can be obtained by cutting or grinding the outer peripheral portion and the inner peripheral portion so that the disk-shaped blade thus obtained has a predetermined size.

The cutting blade configured as described above has a filler 4a having a three-dimensional crystal structure approximating a so-called tetrapot in which needle-like portions extend in four directions from the center of the tetrahedron toward each vertex. The filler 4a having such a structure has no directivity and the entire length and width are not changed from any direction.
For this reason, the resin binder phase 2 to which such a filler 4a is added is relaxed in anisotropy, and can secure substantially the same wear resistance in any direction, resulting in wear resistance. It will be excellent. Moreover, in the resin binder phase 2 after molding, a situation in which the shrinkage rate in a certain direction becomes high can be avoided, and the dimensional accuracy as a product can be improved. Accordingly, the cutting performance is improved and the generation of burrs can be suppressed.

Here, in addition to the filler 4 having a crystal structure of zinc oxide, a powdery filler 5 having a hardness higher than that of the filler having this crystal structure is used as the filler. In such a cutting blade, new abrasive grains 3 are always exposed when the resin binder phase 2 is appropriately worn, and thus good cutting can be performed over a long period of time.
If the resin binder phase 2 does not have only the filler 4 having a crystal structure of zinc oxide and the powdery filler 5 made of WC having relatively high hardness, the resin binder phase 2 is worn more than necessary. The life as a cutting blade is shortened. Here, since the filler WC having a higher hardness than the filler 4 having the crystal structure is used as the filler in addition to the crystal structure filler 4 of the zinc oxide, the wear of the resin binder phase 2 appropriately proceeds. Thus, as described above, the cutting performance is improved and the generation of burrs is suppressed, and the life can be extended.

  In the filler 4a having the three-dimensional crystal structure, the length of the acicular portion 4aa is in the range of 0.1 μm to 100 μm. Thereby, the effect which relieves the anisotropy which is the characteristic effect of this filler can fully be exhibited. If the length of the needle-like portion 4aa is less than 0.1 μm, the size as a filler cannot be ensured, and a point that compensates for mechanical strength, which is an effect when the filler is added, is obtained. It becomes impossible. Further, if the length of the needle-like part 4aa exceeds 100 μm, the needle-like part 4aa itself is liable to be damaged. For example, when adding to the resin binder phase 2 or at the time of molding, the needle-like part 4aa is broken or bent. The advantage of the three-dimensional crystal structure cannot be obtained.

  The filler 4a having a three-dimensional crystal structure is made of a metal oxide crystal structure. When the metal oxide crystal structure is used, the three-dimensional crystal structure can be easily obtained. For example, as described above, by performing an oxidation heat treatment of zinc in a predetermined atmosphere, it is possible to easily obtain a three-dimensional crystal structure in which needle-like portions extend in all directions from the center of the tetrahedron toward each vertex. it can.

  Here, the filler 4 of the metal oxide crystal structure is often easily damaged, and the entire shape thereof may change due to, for example, the needle-like portion being broken. However, here, the volume ratio of the filler 4a having a three-dimensional crystal structure and the filler having another shape made of a metal oxide crystal structure is set in a range of 10:90 to 90:10, and the range is within this range. If so, the function of relaxing the anisotropy, which is a feature of the filler 4a having a three-dimensional crystal structure, can be sufficiently exhibited.

  In addition, fine powdery fillers 5 of WC are dispersed and arranged in the resin binder phase 2, but these fine powdery fillers 5 are usually unevenly distributed locally in the resin binder phase 2. Tend to. However, here, a silane coupling agent is mixed in the resin binder phase 2, and this silane coupling agent is interposed between the fine powdery filler 5 and the resin binder phase 2. Thus, the local uneven distribution of the fine powdery filler 5 is eliminated, and the fine powdery filler 5 can be uniformly dispersed and arranged in the resin binder phase 2.

The surface of the filler 4a having the three-dimensional crystal structure is preferably pre-coated with a silane coupling agent. This is for the following reason.
Fine irregularities are generated on the surface of the filler 4a having a three-dimensional crystal structure, and the resin binder phase 2 is less likely to enter the bottom of the recesses of the irregularities. However, when the surface of the filler 4a having a three-dimensional crystal structure is pre-coated with a silane coupling agent, the wettability of the surface of the filler 4a having a three-dimensional crystal structure is improved and the resin binder phase 2 is sufficiently blended. Therefore, the resin binder phase 2 penetrates to the bottom of the recess in the surface of the filler 4a having a three-dimensional crystal structure. As a result, the holding power of the resin binder phase 2 with respect to the filler 4a having the three-dimensional crystal structure is increased, and the filler 4a having the three-dimensional crystal structure can be prevented from dropping off from the resin binder phase 2 unnecessarily.
In addition, as a method for coating the surface of the filler 4a having a three-dimensional crystal structure with a silane coupling agent in advance, a known dry processing method or slurry method is employed.

  In this embodiment, the volume percentage of the filler 4 of the metal oxide crystal structure in the resin binder phase 2 without abrasive grains is set to 1 to 40%. Thus, if the volume percentage of the filler 4 of the metal oxide crystal structure is set to 1 to 40%, the function of the three-dimensional crystal structure of the metal oxide crystal structure, that is, anisotropic Therefore, the wear resistance and cutting performance can be improved and the occurrence of metal burrs can be suppressed.

Note that the present invention is not limited to the above-described embodiment, and can be appropriately modified as necessary.
For example, in the cutting blade shown in FIG. 1, there is one thin-blade abrasive grain layer 1. However, the present invention is not limited to this, and the present invention can be applied to those having a plurality of such thin-blade abrasive grain layers 1. is there.

Moreover, although the said embodiment gave and demonstrated the resin binder phase 2 which consists of a phenol resin as an example as a bond part, it is not restricted to this, Even if it is a vitrified bond using a ceramic binder phase, this embodiment The invention is applicable.
Moreover, in the said embodiment, as a filler added to the resin binder phase 2, it is not necessarily restricted to the filler 4 which consists of a crystal structure of zinc oxide, The crystal structure of metal oxides other than zinc oxide is used. It may be added. Further, the filler other than the metal oxide crystal structure is not limited to the powdery filler 5 made of WC, but is also a conductive powder made of Ti, TiN, carbon or the like, whisker or glass. A fiber or the like may be added.

Hereinafter, the effects of the present invention will be described with reference to more specific examples.
<First embodiment>
In this example, the content of the filler 5 which is powdery WC is constant (25%), and the addition ratio of the filler 4 which is a zinc oxide crystal structure is variously changed in the resin binder phase 2. A zinc oxide crystal structure with a filler 4 addition ratio of 10% without mixing a silane coupling agent, and a zinc oxide crystal structure without mixing a silane coupling agent into the resin binder phase 2 A total of 10 types of cutting blades according to the present invention were prepared, although the addition ratio of the filler 4 in the body was 35% and the WC powdery filler 5 was not included. This cutting blade has an outer diameter of 58 mm, an inner diameter of 40 mm, and a thickness of 0.3 mm. The resin binder phase 2 is a phenol resin, the abrasive grains 3 are diamond abrasive grains having a particle size # 230, and the degree of concentration is 75. With this cutting blade, the dresser plate was grooved and subjected to a wear test.
Moreover, it is the same shape as the said Examples 1-10, Comprising: Instead of adding the zinc oxide crystal structure 4, what added SiC whisker and glass fiber 10 volume% respectively is set as Comparative Examples 1 and 2, These Using the cutting blades of Comparative Examples 1 and 2, the same abrasion test as in Examples 1 to 10 was performed.
The compositions of the cutting blades of Examples 1 to 10 and Comparative Examples 1 and 2 at this time are shown in Table 1 below.

The test conditions are as follows.
Used Cider Tokyo Seimitsu / A-WD-10A
Used dress plate WA # 200
Spindle speed 15000min ^-1
Feed speed 100mm / s
Cooling water: 1.2 L / min in the circumferential direction, 0.8 L / min on both sides
In addition, 30 grooving processes were performed for each set, 5 sets were performed, and a total of 150 grooving processes were performed. The abrasion test results are shown in Tables 4 and 5 below.

Table 2 shows the average wear as a result of 5 sets, and Table 3 shows the cumulative wear after 5 sets.
These wear amounts are shown in graphs in Tables 4 and 5 below.

As is apparent from these tables, the cutting blades of Examples 1 to 10 to which the filler 4 having a crystal structure of zinc oxide was added had a small amount of friction, and in particular, the filler was in the range of 10% by volume or 20% by volume. The amount of wear of the cutting blades of Examples 2 and 3 added in Example 2 was small.
This is presumed that the anisotropic relaxation function of the filler having a three-dimensional crystal structure among the fillers of the zinc oxide crystal structure was sufficiently exhibited. In addition, when the addition ratio of the filler of the zinc oxide crystal structure became 30 volume% or more, it turned out that the bond strength of a phenol resin weakens and conversely the amount of wear increases.
Further, it was found that the amount of wear was large in the cutting blades of Comparative Examples 1 and 2 that did not have a zinc oxide crystal structure filler but instead added SiC whisker or glass fiber filler.

Further, a disk-shaped blade having a diameter of 70 mm was cut out from a sheet molded by adopting the doctor blade method, the disk-shaped blade was compression-molded by a hot press and sintered, and the warpage of the sintered body was measured. .
The results are shown in Table 6 below.

As is clear from this result, in Examples 1 to 6, the warp amount of about 101 μm to 150 μm or 151 μm to 200 μm is the largest, whereas in Comparative Examples 1 and 2, the warp amount of 300 μm or more is the largest. It was. The reason is presumed that the cutting blades that do not have the zinc oxide crystal structure filler as in Comparative Examples 1 and 2 do not have the anisotropic relaxation function of the three-dimensional crystal structure filler. .
<Second embodiment>

  In this example, the cutting blades of Examples 1 to 10 and Comparative Examples 1 and 2 having different filler compositions described in the first example were first used in the molding resin 11 as shown in FIG. The QFN in which the Cu lead frames 12 were arranged at intervals was cut. Then, the cutting resistance and the wear amount of the thin blade abrasive grain layer during 10 m cutting are measured at the initial cutting time and at the time of 500 m cutting, and the size of the burr extending from the Cu lead frame 12 by observing the cut surface (see FIG. 4, the size of the burr extending in the lateral direction (feeding direction) is X, and the size of the burr extending in the upward direction is Y). These results are shown in Table 7 for the initial cutting and Table 8 for 500 m cutting. The cutting resistance was measured as a load current (A) of a motor that rotates the main shaft of the cutting device to which the cutting blade is attached, and was 2.6 A when no load was applied.

The test conditions are as follows.
Used Cider Tokyo Seimitsu / A-WD-10A
Used dress plate WA # 200
Spindle speed 21000min ^-1
Feeding speed 80mm / s
Cooling water: 1.2 L / min in the circumferential direction, 0.8 L / min on both sides
The outer diameter d of the Cu lead frame 12 was 0.3 mm, and the pitch P between adjacent Cu lead frames 12 was 0.35 mm.

  These results are shown in Table 7 for the initial cutting, and Table 8 for the 500 m cutting.

Next, with the same shape, the same dimensions, and the same resin binder cutting blades as in Examples 1 to 10 and Comparative Examples 1 and 2, the substrate 13 made of glass epoxy resin was spaced apart as shown in FIG. The IrDA board | substrate with which the metal plating 14 of Ni-Cr-Au was given to the inner peripheral surface of the formed through hole so that it had the flange-shaped part 14A at both ends was cut | disconnected. Then, as in the case of the QFN cutting, the cutting resistance and the wear amount and the size of the burr extending from the metal plating 14 (in the lateral direction in the through hole (as shown in FIG. 5) The size of burrs extending in the feed direction) is X, and the size of burrs extending downward from the bottom of the substrate is Y). These results are shown in Table 9 for the initial stage of cutting and Table 10 for the time of cutting 500 m.
However, the test conditions using the cutting blades of Examples 1 to 10 and Comparative Examples 1 and 2 are as described above.
The through hole length L is 0.18 mm, the inner diameter A of the through hole is 0.17 mm, the inner diameter B of the metal plating 14 applied to the inner peripheral surface of the through hole is 0.04 mm, and the outer diameter of the flange-shaped portion 14A. C was 0.7 mm, and the pitch P between adjacent through holes was 2.0 mm.

  From the results shown in Tables 7 to 10, in any of the cuttings of the QFN and IrDA substrates, the cutting blades of Comparative Examples 1 and 2 in which the filler of the crystal structure of zinc oxide is not first added to the resin binder phase. Compared to the cutting blades of Examples 1 to 10 to which the filler of the crystal structure of zinc oxide was added, all of the cutting resistance, burrs, and wear amount were large from the beginning of cutting, and the tendency became more remarkable at the time of cutting 500 m. . On the other hand, the cutting blades of Examples 1 to 10 in which the filler of the zinc oxide crystal structure is dispersed in the resin binder phase, particularly the zinc oxide crystal structure filler in the range of 10% by volume and 20% by volume. In the cutting blades of Examples 2 and 3 added in step 3, the cutting resistance, burrs, and wear amount are all kept low from the beginning of cutting. Further, at the time of cutting 500 m, the amount of wear increases in Examples 8 and 10, and the size of burrs tends to increase particularly when cutting IrDA substrates. It can be seen that in the cutting blades of Examples 1 to 7 and 9, there is no change in the cutting resistance, and the wear amount and the size of the burr are suppressed to a sufficiently small range. Further, it can be seen that, among Examples 1 to 10, in Examples 2 and 3 in which the content of the filler of the zinc oxide crystal structure is 10% by volume and 20% by volume, the wear amount is suppressed to be small.

  The present invention relates to a cutting blade used for cutting various electronic material parts such as a semiconductor device. According to the cutting blade of the present invention, it is a cutting blade having a layer shape of at least one layer, and is distributed in a bond portion, abrasive grains distributed in the bond portion, and dispersed in the bond portion. The filler includes a filler having a three-dimensional crystal structure in which needle-like portions extend in four directions from the center of the tetrahedron toward each vertex, and are thereby added to the bond portion. By reducing the anisotropy of the filler, the wear resistance and cutting performance can be improved, and in addition, the occurrence of metal burrs can be suppressed.

1 Thin blade abrasive 2 Resin binder phase (bond part)
3 Abrasive grains 4 Zinc oxide (metal oxide) crystal structure 4a Zinc oxide (metal oxide) three-dimensional crystal structure filler 5 Powder-like filler having higher hardness than three-dimensional crystal structure filler

Claims (8)

A cutting blade having a layer shape of at least one layer,
Bond part,
Abrasive grains distributed in the bond part;
A filler dispersed in the bond part,
The filler has a three-dimensional crystal structure filler in which needle-like portions extend in four directions from the center of the tetrahedron toward each vertex. The cutting blade according to claim 1,
The filler is a cutting blade having a powdery filler having a hardness higher than that of the filler having the three-dimensional crystal structure in addition to the filler having the three-dimensional crystal structure. The cutting blade according to claim 1 or 2,
The filler for a three-dimensional crystal structure is a cutting blade in which the length of the needle-like portion is in the range of 0.1 μm to 100 μm. In the cutting blade according to any one of claims 1 to 3,
The three-dimensional crystal structure filler is a cutting blade made of a metal oxide crystal structure. The cutting blade according to claim 4,
The filler of the metal oxide crystal structure includes a filler having a shape different from the three-dimensional crystal structure in addition to the filler of the three-dimensional crystal structure,
A cutting blade in which the volume ratio of the filler having the three-dimensional crystal structure and the filler having a shape different from the three-dimensional crystal structure is in the range of 10:90 to 90:10. In the cutting blade according to any one of claims 1 to 5,
A cutting blade in which a silane coupling agent is mixed in the bond portion. In the cutting blade according to any one of claims 1 to 5,
A cutting blade in which a surface of the filler having the three-dimensional crystal structure is coated with a silane coupling agent. The cutting blade according to claim 5, wherein
The cutting blade in which the volume percentage of the filler of the crystal structure of the metal oxide in the bond portion without abrasive grains is set to 1 to 40%.

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