JP5001398B2 - Diamond scribing tool and manufacturing method thereof - Google Patents

Description

  The present invention relates to a scribing tool using diamond.

  Conventionally, in order to cut a plate glass, scribing is performed, and then the glass plate is cut along a scribe line. The target glass plate has various thicknesses, for example, from relatively thick glass for building materials and automobiles to large-sized laminated glass plates for liquid crystal televisions and the like, and small-sized laminated glass plates for mobile phones and the like. In particular, a small glass plate such as a mobile phone tends to be thin. In the case of cutting a thin glass plate, it is necessary to reduce the scribe load in order to suppress irregular fracture, and for this purpose, it is necessary to reduce the diameter of the scribing wheel. However, the smallest scribing wheel has an outer diameter of about φ1 mm, and it is difficult to make the scribing wheel smaller than this.

  On the other hand, scribing tools using diamond points made of natural diamond are used for cleaving silicon semiconductors and sapphire. This tool using diamond points made of natural diamond is expected to be useful because the contact circle diameter can be reduced even in the cutting of thin glass. Among the natural diamonds produced, the most frequently occurring natural diamond is an octahedral crystal composed of eight equilateral triangles as shown in FIG. 1A, and the next most frequently occurring basic shape is shown in FIG. As shown in (b), it is a dodecahedron crystal formed by collecting 12 rhombus faces. There is a regular hexahedron crystal (FIG. 1 (c)), which has a lower frequency of appearance than these, but is formed of six regular tetragons, and the plane of the hexahedron crystal is called a hexahedron plane or (100) plane. FIG. 1D shows a crystal in which a cube and a regular octahedron are combined.

  Conventionally, natural diamond of 1/70 to 1/80 carat has been used for scribing plate glass. Patent Document 1 discloses a scribing tool in which three orthogonal axes are joined to a base so as to correspond to an attachment axis of one tool. After joining, the diamond is polished in the direction of the mounting axis to form the (100) plane, and polished and used so that one point where the (100) plane and the octahedral (111) plane intersect becomes the scribe point. . A tool used by polishing four surfaces intersecting a hexahedral surface ((100) surface) and an octahedral surface ((111) surface) is called a four-point tool.

  Conventionally, the operation of joining the polished diamond to the shank by detecting the (100) plane relies on the skill of a skilled worker. Therefore, in a scribing tool using natural diamond, it is inevitable that the inclination of the surface formed by polishing diamond in the axial direction and the (100) plane varies from 1.1 ° to 5.8 °.

Japanese Patent Publication No. 47-20236

  The present invention has been made paying attention to such problems, and can be held in the shank by reducing the inclination between the (100) plane using synthetic diamond and the plane formed by polishing diamond in the axial direction. Therefore, it is a technical problem to make it easy to manufacture and to obtain high performance.

  In order to solve this problem, the diamond scribing tool of the present invention has a first (100) plane and a second (100) plane parallel to the first (100) plane, Synthetic diamond abrasive grains having a point at the intersection of at least two (111) planes adjacent to the (100) plane, a shank having a counterbore at the tip, and a center of the shank at the counterbore of the shank A brazing material that holds the synthetic diamond abrasive grains while holding the first and second (100) planes of the synthetic diamond abrasive grains perpendicular to an axis.

  Here, the synthetic diamond abrasive may have a weight of 1/100 carat or less.

  Here, in the synthetic diamond abrasive grains, the (111) plane adjacent to the (100) plane may be four, and the four intersections may be points.

  In order to solve this problem, in the method for manufacturing a diamond scribing tool of the present invention, a counterbore is formed at the tip of the shank, and the first (100) plane and the first (100) plane are parallel to the first. The first (100) surface of the synthetic diamond abrasive having two (100) surfaces is temporarily fixed to a pressing jig having a surface perpendicular to the central axis of the shank, and the pressing treatment is carried out in the counterbore of the shank. The diamond abrasive grains attached to the tool are press-fitted so that the axis of the first (100) plane and the shank are perpendicular to each other and brazed with a brazing material, and the diamond abrasive grains attached to the tip of the shank are At least two (111) planes adjacent to one (100) plane are polished and their intersections are used as points.

  Here, in the polishing step, four (111) planes adjacent to the first (100) plane may be polished to form four intersections as points.

  According to the present invention having such characteristics, a crystal plane can be easily found by using synthetic diamond abrasive grains with a developed (100) plane, and the diamond is attached to the shank based on this plane. A scribing tool can be easily manufactured with less inclination of the abrasive grains. Moreover, the price of the scribing tool can be reduced by using a synthetic diamond smaller than the conventional one. In addition, since the scribing load can be reduced by using this scribing tool, it can be suitably used for scribing a thin brittle material (glass, silicon, sapphire, etc.) substrate.

FIG. 1 shows a conventional natural diamond crystal. FIG. 2 is a diagram showing a manufacturing process of the diamond scribing tool according to the embodiment of the present invention. FIG. 3 is an enlarged view showing a manufacturing process of the diamond scribing tool according to the present embodiment. FIG. 4A is an enlarged view showing a state where diamond abrasive grains are attached to the chip holding hole of the shank, and FIG. 4B is a top view thereof. FIG. 5A is an enlarged cross-sectional view showing a state where diamond abrasive grains are polished, and FIG. 5B is a top view thereof.

  The scribing tool according to the present embodiment is a scribing tool using synthetic diamond developed for saw blades at the tip of the tool. Here, the high-quality synthetic diamond abrasive for saw blade will be described. The high-quality diamond abrasive for saw blades is an Ib type synthetic diamond which is synthesized using a seed crystal and has a large number of inclusions and high strength. For example, the grain size is # 16/20 or # 20. / 25 etc. are used. Here, # 16/20 indicates a particle size that is classified so as to pass through the No. 16 sieve and stop at the No. 20 sieve, and so on. Synthetic diamond for saw blades has a higher fracture toughness value than synthetic diamonds for other uses (for metal bonds and resins / vitrified bonds), and the particle diameter falls into the coarsest category as synthetic diamond abrasive grains.

  When using this diamond abrasive grain as a scribing tool, only the point that is the diamond corner is used, so the size is not limited. Therefore, in terms of cost, it is preferable to use a small diamond as long as processing and bonding are possible. In this embodiment, high-quality diamond abrasive grains for saw blades of about 1/170 carat classified by a # 20/25 sieve are used as synthetic diamond. # 18/20 about 1/130 carat (about 1.5 mg) saw blade diamond abrasive grain may be used, preferably 1/100 carat or less.

  Synthetic diamond has a (100) plane formed substantially parallel to the opposing surface of the diamond. Here, one is a first (100) plane and the other is a second (100) plane. The first (100) surface is attached to a jig so as to be the upper surface. 2 and 3 are diagrams showing a manufacturing process of the scribing tool according to the embodiment of the present invention. As shown in this figure, the shank 11 has a conical tip, and a circular counterbore 12 is formed in the upper tip surface. The diameter of the counterbore 12 is, for example, φ0.9 mm. Then, the central axis of the shank 11 shown by a one-dot chain line in the figure is held in the vertical direction, and the pressing jig 13 is arranged so as to be vertically movable with respect to the shank 11 from above. The lower surface of the holding jig 13 is perpendicular to the central axis of the shank 11, and a synthetic diamond 15 is attached to the lower end of the holding jig 13 via a temporary fixing agent 14 as shown in an enlarged view in FIG. The temporary fixing agent 14 is, for example, an adhesive such as a double-sided tape or a bond, and attaches the first (100) surface 15 a of the synthetic diamond 15 in parallel to the lower surface of the pressing jig 13. Further, as shown in an enlarged view in FIG. 3, the brazing material 16 is inserted into the counterbore hole 12, and the synthetic diamond 15 is pressed into the counterbore hole 12 from above and pressed into the brazing material 16. In this way, the first (100) surface 15 a becomes perpendicular to the central axis of the shank 11, and the synthetic diamond 15 is held on the top of the counterbore 12 by the brazing material 16. Thereafter, soldering is performed in a vacuum furnace, and the synthetic diamond 15 is firmly fixed to the tip of the shank 11 by the brazing material 16. FIG. 4A is a sectional view of the tip portion showing a state where the synthetic diamond is thus attached, and FIG. 4B is a top view thereof.

  Next, as shown in FIG. 5, the (100) surface 15a on the upper surface is polished so that the side surfaces become the (111) surfaces 15c to 15f, and the (100) surface 15a and the (111) surface adjacent to the (100) surface 15a The four points P1 to P4 are formed by polishing so that the intersection points become points. The angle formed between the (100) surface 15a and the (111) surfaces 15c to 15f is 135 °, and the angle formed between two adjacent (111) surfaces is approximately 110 °. By forming the four points P1 to P4 in this way, the scribing tool can be completed. The four points P1 to P4 thus formed can be used as points for scribing. In the present embodiment, when synthetic diamond is attached to the tip of the shank with a brazing material, the inclination angle α of the normal line of the (100) plane of the synthetic diamond with respect to the central axis of the shaft becomes an inclination of 2.0 ° or less. Therefore, the mounting variation can be reduced as compared with the conventional scribing tool.

  As described above, according to the present invention, the crystal plane can be easily found by using the synthetic diamond abrasive grain for saw blade having the developed (100) plane, and the process time for processing the (100) plane can be reduced. Can do. Accordingly, the scribing tool can be easily manufactured. Moreover, the price of the scribing tool can be reduced by using a synthetic diamond smaller than the conventional one.

  The scribing tool using synthetic diamond according to the present embodiment can be used for scribing not only a thin glass plate but also a brittle material substrate such as a silicon plate, a sapphire plate, an InP plate, a GaN plate, and a GaAs plate. In the present embodiment, the four (111) surfaces 15c to 15f are formed by polishing. However, if only one point is required, it is sufficient to form the two (111) surfaces by polishing.

  The present invention can easily produce a scribing tool using synthetic diamond, and can be used as a scribing tool for various shapes of brittle material substrates such as thin glass plates.

DESCRIPTION OF SYMBOLS 11 Shank 12 Countersunk hole 13 Holding jig 14 Temporary fixing agent 15 Synthetic diamond 15a, 15b (100) surface 15c-15f (111) surface 16 Brazing material

Claims (5)

A first (100) plane and a second (100) plane parallel to the first (100) plane, and at least two (111) planes adjacent to the first (100) plane; Synthetic diamond abrasive grains with the intersection of
A shank with a counterbore at the tip;
The synthetic diamond abrasive grains are held in the counterbore holes of the shank so that the first and second (100) planes of the synthetic diamond abrasive grains are perpendicular to the central axis of the shank. A diamond scribing tool having a brazing material.   The diamond scribing tool according to claim 1, wherein the synthetic diamond abrasive has a weight of 1/100 carat or less.   The diamond scribing tool according to claim 1, wherein the synthetic diamond abrasive grain has four (111) planes adjacent to the (100) plane, and the four intersections are points. A counterbore is formed at the tip of the shank,
A first (100) plane of a synthetic diamond abrasive grain having a first (100) plane and a second (100) plane parallel to the first (100) plane is a plane perpendicular to the central axis of the shank. Temporarily fix to a holding jig with
The diamond abrasive grains attached to the holding jig in the countersunk hole of the shank are press-fitted so that the first (100) surface and the shank axis are perpendicular to each other, and brazed with a brazing material,
A method for manufacturing a diamond scribing tool, comprising polishing at least two (111) surfaces adjacent to a first (100) surface of a synthetic diamond abrasive grain attached to the tip of the shank and using the intersection as a point.   5. The method of manufacturing a diamond scribing tool according to claim 4, wherein in the polishing step, four intersection points are formed by polishing four (111) surfaces adjacent to the first (100) surface, respectively.

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