JP2015107573A - Soldering drilling tool - Google Patents

Soldering drilling tool Download PDF

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JP2015107573A
JP2015107573A JP2013250908A JP2013250908A JP2015107573A JP 2015107573 A JP2015107573 A JP 2015107573A JP 2013250908 A JP2013250908 A JP 2013250908A JP 2013250908 A JP2013250908 A JP 2013250908A JP 2015107573 A JP2015107573 A JP 2015107573A
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abrasive grains
diameter
tool
brazing
center point
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JP6247084B2 (en
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篤 和田
Atsushi Wada
篤 和田
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Asahi Diamond Industrial Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a soldering drilling tool capable of stabilizing tool life.SOLUTION: A soldering drilling tool 1 is a soldering drilling tool in which super abrasive grains are soldered on a tip part 5 of a rotated base metal 4. The super abrasive grains comprise: main abrasive grains 9 dispersed and disposed on the tip part 5 of the base metal 4; and one or plural large diameter abrasive grains 11 whose diameter is larger than that of the main abrasive grains 9. At least one of the large diameter abrasive grains 11 is disposed on a rotary central point 5c of a tip surface 5a of the base metal 4.

Description

本発明は、ロウ付け穴あけ工具に関する。   The present invention relates to a brazing drilling tool.

従来、コンクリート又は石材等の硬脆材の穿孔加工には、ダイヤモンド砥粒をロウ付けした工具が使用されている。このような工具として、例えば特許文献１では、金属ボディの外周面と、金属ボディの先端面とに、ロウ付用合金を溶融してダイヤモンド砥粒を固着したドリルが開示されている。   Conventionally, tools for brazing diamond abrasive grains have been used for drilling hard brittle materials such as concrete or stone. As such a tool, for example, Patent Document 1 discloses a drill in which a brazing alloy is melted and diamond abrasive grains are fixed to an outer peripheral surface of a metal body and a front end surface of the metal body.

特開２０００−１０８１１７号公報JP 2000-108117 A

上記特許文献１に記載の技術では、ロウ付用合金粉末とペースト用バインダとで形成したペーストが、金属ボディの先端面から２〜２０ｍｍ程度に相当する金属ボディの外周面と、凹面状に掘削された先端とに塗布され、当該塗布面にダイヤモンド砥粒が散布固定されている。このようなダイヤモンド砥粒の固定方法は、いわゆるバラマキ法と呼ばれており、ダイヤモンド砥粒を略均一に散布固定できる。しかしながら、発明者等が磁器タイルの穿孔加工実験を行った結果、ロウ付けする砥粒域全体にダイヤモンド砥粒がバラマキ法により固定された工具では、工具寿命にばらつきが生じることを見出した。   In the technique described in Patent Document 1, the paste formed by the brazing alloy powder and the paste binder is excavated into a concave shape and an outer peripheral surface of the metal body corresponding to about 2 to 20 mm from the tip surface of the metal body. The diamond abrasive grains are spread and fixed on the coated surface. Such a method for fixing diamond abrasive grains is called a so-called balamaki method, and diamond abrasive grains can be dispersed and fixed substantially uniformly. However, as a result of the drilling processing of porcelain tiles by the inventors, it has been found that the tool life varies in a tool in which diamond abrasive grains are fixed to the entire abrasive grain area to be brazed by the baraki method.

そこで、本発明は、工具寿命を安定化することができるロウ付け穴あけ工具を提供することを課題とする。   Then, this invention makes it a subject to provide the brazing drilling tool which can stabilize a tool life.

上記課題を解決するため、発明者等が工具寿命のばらつきについて研究したところ、回転中心点にダイヤモンド砥粒がロウ付けされていない工具の寿命が短くなるとの知見を得た。更に、バラマキ法は個々のダイヤモンド砥粒の位置を制御できないことから、工具寿命にばらつきが生じるとの知見に至った。そして、主砥粒よりも大きな大径砥粒の少なくとも１つを回転中心点に配置することで、上記課題を解決できることを見出した。本発明に係るロウ付け穴あけ工具は、回転される台金の先端部分に超砥粒がロウ付けされたロウ付け穴あけ工具であって、超砥粒は、台金の先端部分に分散配置される主砥粒と、主砥粒よりも大径である１又は複数の大径砥粒とを含み、大径砥粒の少なくとも１つは、台金の先端面の回転中心点に配置されていることを特徴とする。   In order to solve the above-mentioned problems, the inventors have studied the variation in tool life, and have found that the life of a tool in which diamond abrasive grains are not brazed at the rotation center point is shortened. Furthermore, since the balamaki method cannot control the position of individual diamond abrasive grains, it has been found that the tool life varies. And it discovered that the said subject could be solved by arrange | positioning at least one large-diameter abrasive grain larger than a main abrasive grain to a rotation center point. A brazing drilling tool according to the present invention is a brazing drilling tool in which superabrasive grains are brazed to a tip portion of a rotating base metal, and the superabrasive grains are distributed and arranged at the tip portion of the base metal. Main abrasive grains and one or a plurality of large-diameter abrasive grains having a diameter larger than that of the main abrasive grains, and at least one of the large-diameter abrasive grains is disposed at the rotation center point of the tip surface of the base metal. It is characterized by that.

本発明に係るロウ付け穴あけ工具では、主砥粒よりも大径である大径砥粒が、台金の先端面の回転中心点に少なくとも１つ配置されている。大径砥粒の径は主砥粒の径よりも大きいので、主砥粒に比して、台金の先端面の回転中心点に配置し易く、且つ、先端面から外れ難い。そして、中央砥粒がこのように回転中心点に配置されていることにより、従来のバラマキ法によりロウ付けされた工具に比して、工具寿命を安定化することができる。   In the brazing hole drilling tool according to the present invention, at least one large-diameter abrasive grain that is larger in diameter than the main abrasive grain is disposed at the rotation center point of the tip surface of the base metal. Since the diameter of the large-diameter abrasive grain is larger than the diameter of the main abrasive grain, it is easier to dispose at the center of rotation of the tip surface of the base metal and hard to come off from the tip surface than the main abrasive grain. And since a center abrasive grain is arrange | positioned in this way at a rotation center point, tool life can be stabilized compared with the tool brazed by the conventional balamaki method.

また、台金の先端面の回転中心点には、凹部が形成されていてもよい。この場合、凹部が形成されていることによって、回転中心点における大径砥粒の配置を、より簡易且つ安定して行うことができる。   Moreover, the recessed part may be formed in the rotation center point of the front end surface of a base metal. In this case, since the concave portion is formed, the arrangement of the large-diameter abrasive grains at the rotation center point can be performed more easily and stably.

また、複数の大径砥粒が、列状又は島状に配置されていてもよい。この場合、大径砥粒が列状又は島状に配置されていることにより、ロウ付けによる大径砥粒の保持力を高めることができる。その結果、ロウ付け穴あけ工具の切れ味が安定し、工具寿命を延ばすことが可能となる。   Moreover, the several large diameter abrasive grain may be arrange | positioned at the line form or the island form. In this case, the holding power of the large-diameter abrasive grains by brazing can be increased by arranging the large-diameter abrasive grains in rows or islands. As a result, the sharpness of the brazing hole drilling tool is stabilized, and the tool life can be extended.

また、複数の大径砥粒が、多層に配置されていてもよい。この場合、大径砥粒が多層に配置されていることにより、例えば回転中心点に配置される大径砥粒を内側層に配置することができる。その結果、外側層の大径砥粒が台金の先端面から外れても、内側層において回転中心点に配置される大径砥粒を先端面に保持でき、工具寿命を延ばすことが可能となる。   Moreover, the some large diameter abrasive grain may be arrange | positioned at the multilayer. In this case, by arranging the large-diameter abrasive grains in multiple layers, for example, the large-diameter abrasive grains arranged at the rotation center point can be arranged in the inner layer. As a result, even if the large-diameter abrasive grains in the outer layer deviate from the tip surface of the base metal, the large-diameter abrasive grains arranged at the rotation center point in the inner layer can be held on the tip surface, and the tool life can be extended. Become.

本発明によれば、工具寿命を安定化することができる。   According to the present invention, the tool life can be stabilized.

本発明の第１実施形態に係るロウ付け穴あけ工具の概略構成を示す側面図である。It is a side view showing a schematic structure of a brazing drilling tool concerning a 1st embodiment of the present invention. 図１のロウ付け穴あけ工具の先端部分を示す概略側断面図である。It is a schematic sectional side view which shows the front-end | tip part of the brazing drilling tool of FIG. 図１のロウ付け穴あけ工具の先端部分を示す概略平面図である。It is a schematic plan view which shows the front-end | tip part of the brazing drilling tool of FIG. 各製造工程におけるロウ付け穴あけ工具の先端部分を示す概略側断面図である。It is a schematic sectional side view which shows the front-end | tip part of the brazing drilling tool in each manufacturing process. 本発明の第２実施形態に係るロウ付け穴あけ工具の先端部分を示す概略側断面図である。It is a schematic sectional side view which shows the front-end | tip part of the brazing drilling tool which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係るロウ付け穴あけ工具の先端部分を示す概略平面図である。It is a schematic plan view which shows the front-end | tip part of the brazing drilling tool which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係るロウ付け穴あけ工具の先端部分を示す概略側断面図である。It is a schematic sectional side view which shows the front-end | tip part of the brazing drilling tool which concerns on 3rd Embodiment of this invention. 本発明の第３実施形態に係るロウ付け穴あけ工具の先端部分を示す概略平面図である。It is a schematic plan view which shows the front-end | tip part of the brazing drilling tool which concerns on 3rd Embodiment of this invention. 実施例に係るロウ付け穴あけ工具によるタイル穿孔試験結果を示す表である。It is a table | surface which shows the tile drilling test result by the brazing drilling tool which concerns on an Example. 比較例に係るロウ付け穴あけ工具によるタイル穿孔試験結果を示す表である。It is a table | surface which shows the tile drilling test result by the brazing drilling tool which concerns on a comparative example.

以下、添付図面を参照して、本発明の好適な実施形態について詳細に説明する。なお、説明において、同一要素又は同一機能を有する要素には、同一符号を用いることとし、重複する説明は省略する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

（第１実施形態）
まず、本発明の第１実施形態に係るロウ付け穴あけ工具の構成について、図１〜図３を用いて説明する。 (First embodiment)
First, the structure of the brazing drilling tool according to the first embodiment of the present invention will be described with reference to FIGS.

図１に示すように、本実施形態に係るロウ付け穴あけ工具１（以下、単に「工具１」という。）は、例えば外壁用の磁器タイルの落下防止のため、磁器タイルに６ｍｍ程度の固定用の穴を開ける回転工具であり、丸棒状に細長く延びる台金４と、この台金４の先端部分５に形成された超砥粒層７とを備えている。超砥粒層７は、例えばダイヤモンド砥粒又はＣＢＮ砥粒といった超砥粒が、ロウ付け法により台金４の先端部分５の表面上に固着されることで形成されている。工具１の基端側は、シャンク１４を構成しており、工具１は、シャンク１４が工作機械のチャックに保持された状態で、回転軸線Ａを中心にして回転する。シャンク１４から先端側に延びたボデー１７には、ねじれ溝が形成されている。   As shown in FIG. 1, a brazing hole drilling tool 1 (hereinafter simply referred to as “tool 1”) according to this embodiment is for fixing to a porcelain tile, for example, about 6 mm in order to prevent the outer wall porcelain tile from falling. A base metal 4 that is elongated in the shape of a round bar, and a superabrasive grain layer 7 that is formed on the tip portion 5 of the base metal 4. The superabrasive grain layer 7 is formed by fixing superabrasive grains such as diamond abrasive grains or CBN abrasive grains on the surface of the tip portion 5 of the base metal 4 by a brazing method. The base end side of the tool 1 constitutes a shank 14, and the tool 1 rotates around the rotation axis A in a state where the shank 14 is held by a chuck of the machine tool. A torsion groove is formed in the body 17 extending from the shank 14 toward the tip side.

図２及び図３に示すように、台金４の先端部分５には、工具１の回転軸線Ａに平行な直線に交差する先端面５ａと、回転軸線Ａの方向に略平行に沿う外周面５ｂとが含まれる。先端面５ａは、突出した半球状に形成され、回転軸線Ａと交わる工具１の回転中心点５ｃを有している。この回転中心点５ｃは、例えば、工具１が穴あけを行う際に、穴をあける対象と最も早く接触する部分であり、工具１の回転によらず略一定の位置を保っている。すなわち、回転中心点５ｃは、略回転しない位置である。ただし、回転中心点５ｃは、先端面５ａの凹んでいる部分に位置していてもよく、穴をあける対象と最も早く接触しなくてもよい。本実施形態においては、先端面５ａの回転中心点５ｃに、凹部６が形成されている。凹部６は、例えば半球状の窪みである。   As shown in FIGS. 2 and 3, the tip portion 5 of the base metal 4 has a tip surface 5 a that intersects a straight line parallel to the rotation axis A of the tool 1 and an outer peripheral surface that is substantially parallel to the direction of the rotation axis A. 5b. The tip surface 5 a is formed in a protruding hemispherical shape and has a rotation center point 5 c of the tool 1 that intersects the rotation axis A. The rotation center point 5c is, for example, the part that comes in contact with the object to be drilled earliest when the tool 1 performs drilling, and maintains a substantially constant position regardless of the rotation of the tool 1. That is, the rotation center point 5c is a position that does not substantially rotate. However, the rotation center point 5c may be located in the recessed part of the front end surface 5a, and does not need to contact the object which makes a hole earliest. In the present embodiment, a recess 6 is formed at the rotation center point 5c of the tip surface 5a. The recess 6 is, for example, a hemispherical recess.

超砥粒層７を形成する超砥粒には、主砥粒９と、大径砥粒１１とが含まれる。主砥粒９は、台金４の先端部分５の全体に分散配置されている。主砥粒９は、先端面５ａと外周面５ｂとに亘り、略均一に分布している。主砥粒９の粒径は、例えば＃２５〜＃８０である。   The superabrasive grains that form the superabrasive grain layer 7 include main abrasive grains 9 and large-diameter abrasive grains 11. The main abrasive grains 9 are distributed and disposed throughout the tip portion 5 of the base metal 4. The main abrasive grains 9 are distributed substantially uniformly over the front end surface 5a and the outer peripheral surface 5b. The particle size of the main abrasive grains 9 is, for example, # 25 to # 80.

大径砥粒１１は、台金４の先端面５ａの少なくとも回転中心点５ｃに配置されている。大径砥粒１１は、例えば、凹部６に入り込んでいる。凹部６の大きさは、大径砥粒１１が入る程度の大きさである。大径砥粒１１の粒径は、主砥粒９の粒径よりも大きく、例えば主砥粒９の粒径の１．１〜２倍程度で、より好ましくは１．５〜１．８倍である。なお、大径砥粒１１は、少なくとも一部が回転中心点５ｃに配置されていればよく、大径砥粒１１の中心が回転中心点５ｃに配置されていなくてもよい。   The large-diameter abrasive grains 11 are disposed at least at the rotation center point 5 c of the tip surface 5 a of the base metal 4. For example, the large-diameter abrasive grain 11 enters the recess 6. The size of the recess 6 is large enough to accommodate the large diameter abrasive grains 11. The particle diameter of the large-diameter abrasive grains 11 is larger than that of the main abrasive grains 9, for example, about 1.1 to 2 times, more preferably 1.5 to 1.8 times the particle diameter of the main abrasive grains 9. It is. The large-diameter abrasive grains 11 may be at least partially arranged at the rotation center point 5c, and the center of the large-diameter abrasive grains 11 may not be arranged at the rotation center point 5c.

複数の主砥粒９のうちの少なくとも１つが、先端面５ａの回転中心点５ｃに略等しい位置に配置され、回転中心点５ｃに位置する大径砥粒１１を覆っていてもよい。このような配置の状態で台金４の先端部分５に主砥粒９及び大径砥粒１１がロウ付けされることにより、主砥粒９の形状が先端部分５の外観に顕著に現れる一方、大径砥粒１１は主砥粒９に覆われることで、その形状が外観にあまり現れない（図１参照）。なお、主砥粒９は、回転中心点５ｃに配置されていなくてもよく、大径砥粒１１を覆っていなくてもよい。   At least one of the plurality of main abrasive grains 9 may be disposed at a position substantially equal to the rotation center point 5c of the tip surface 5a and may cover the large-diameter abrasive grain 11 positioned at the rotation center point 5c. While the main abrasive grains 9 and the large-diameter abrasive grains 11 are brazed to the tip portion 5 of the base metal 4 in such a state of arrangement, the shape of the main abrasive grains 9 appears remarkably in the appearance of the tip portion 5. The large-diameter abrasive grains 11 are covered with the main abrasive grains 9 so that the shape does not appear so much in appearance (see FIG. 1). The main abrasive grains 9 may not be disposed at the rotation center point 5 c and may not cover the large diameter abrasive grains 11.

次に、工具１の製造方法を、図４を参照して説明する。図４は、各製造工程におけるロウ付け穴あけ工具１の先端部分５を示す概略断面図である。まず、台金４の先端部分５における凹部６に接着剤を塗布すると共に、当該凹部６に大径砥粒１１を付着させる（図４の（ａ）参照）。続いて、台金４の先端部分５の全体にロウ材Ｒを貼り付ける（図４の（ｂ）参照）。続いて、台金４の先端部分５の全体に接着剤を塗布すると共に、当該全体に主砥粒９を分散配置する（図４の（ｃ）参照）。そして、真空ロウ付けを行い、大径砥粒１１及び主砥粒９を台金４の先端部分５に固着する。   Next, a method for manufacturing the tool 1 will be described with reference to FIG. FIG. 4 is a schematic cross-sectional view showing the tip portion 5 of the brazing drilling tool 1 in each manufacturing process. First, an adhesive is applied to the concave portion 6 in the tip portion 5 of the base metal 4, and the large-diameter abrasive grains 11 are attached to the concave portion 6 (see FIG. 4A). Subsequently, the brazing material R is attached to the entire tip portion 5 of the base metal 4 (see FIG. 4B). Subsequently, an adhesive is applied to the entire front end portion 5 of the base metal 4 and the main abrasive grains 9 are dispersedly arranged over the entire front end portion 5 (see FIG. 4C). Then, vacuum brazing is performed, and the large-diameter abrasive grains 11 and the main abrasive grains 9 are fixed to the tip portion 5 of the base metal 4.

以上、本実施形態に係る工具１によれば、主砥粒９の径よりも大きな径の大径砥粒１１が、台金４の先端面５ａの回転中心点５ｃに配置されている。大径砥粒１１の径は主砥粒９の径よりも大きいので、主砥粒９に比して、台金４の先端面５ａの回転中心点５ｃに配置し易く、且つ、先端面５ａから外れ難い。そして、大径砥粒１１がこのように回転中心点５ｃに配置されていることにより、従来のバラマキ法によりロウ付けされた工具に比して、工具寿命を安定化することができる。   As described above, according to the tool 1 according to the present embodiment, the large-diameter abrasive grain 11 having a diameter larger than the diameter of the main abrasive grain 9 is disposed at the rotation center point 5 c of the tip surface 5 a of the base metal 4. Since the diameter of the large-diameter abrasive grain 11 is larger than the diameter of the main abrasive grain 9, it is easier to arrange at the rotation center point 5 c of the distal end face 5 a of the base metal 4 than the main abrasive grain 9 and the distal end face 5 a. Hard to come off. Since the large-diameter abrasive grains 11 are thus arranged at the rotation center point 5c, the tool life can be stabilized as compared with a tool brazed by a conventional balamaki method.

また、工具１によれば、台金４の先端面５ａの回転中心点５ｃには、半球状の窪みである凹部６が形成されている。よって、この凹部６により、回転中心点５ｃにおける大径砥粒１１の配置を、より簡易且つ安定して行うことができる。   Further, according to the tool 1, the concave portion 6 that is a hemispherical depression is formed at the rotation center point 5 c of the tip surface 5 a of the base metal 4. Therefore, the concave portion 6 makes it possible to more easily and stably arrange the large-diameter abrasive grains 11 at the rotation center point 5c.

（第２実施形態）
次に、第２実施形態に係るロウ付け穴あけ工具の構成について、図５及び図６を用いて説明する。図５は、本発明の第２実施形態に係るロウ付け穴あけ工具の先端部分を示す概略側断面図である。図６は、本発明の第２実施形態に係るロウ付け穴あけ工具の先端部分を示す概略平面図である。ただし、図５及び図６においては、ロウ付け法により貼り付けられるロウ材Ｒの図示を省略すると共に、図６においては、主砥粒９の図示を省略している。 (Second Embodiment)
Next, the structure of the brazing hole drilling tool according to the second embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a schematic sectional side view showing a tip portion of a brazing drilling tool according to a second embodiment of the present invention. FIG. 6 is a schematic plan view showing a tip portion of a brazing drilling tool according to a second embodiment of the present invention. However, in FIG. 5 and FIG. 6, illustration of the brazing material R bonded by the brazing method is omitted, and illustration of the main abrasive grains 9 is omitted in FIG. 6.

図５及び図６に示すように、本実施形態に係るロウ付け穴あけ工具２（以下、単に「工具２」という。）も、第１実施形態に係る工具１同様、台金４の先端部分５に、工具１の回転軸線Ａに平行な直線に交差する先端面５ａと、回転軸線Ａの方向に略平行に沿う外周面５ｂとが含まれる。先端面５ａは、突出した半球状に形成され、回転軸線Ａと交わる工具１の回転中心点５ｃを有している。また、主砥粒９が、台金４の先端部分５の全体に分散配置され、先端面５ａと外周面５ｂとに亘り、略均一に分布している。   As shown in FIGS. 5 and 6, the brazing hole drilling tool 2 (hereinafter simply referred to as “tool 2”) according to the present embodiment is the same as the tool 1 according to the first embodiment. In addition, a tip surface 5a that intersects a straight line parallel to the rotation axis A of the tool 1 and an outer peripheral surface 5b that is substantially parallel to the direction of the rotation axis A are included. The tip surface 5 a is formed in a protruding hemispherical shape and has a rotation center point 5 c of the tool 1 that intersects the rotation axis A. Further, the main abrasive grains 9 are distributed and disposed over the entire tip portion 5 of the base metal 4 and are distributed substantially uniformly over the tip surface 5a and the outer peripheral surface 5b.

本実施形態に係る工具２は、第１実施形態に係る工具１と異なり、半球状の窪みである凹部６の代わりに、溝状の凹部１３が形成されている。また、当該凹部１３には、３つの大径砥粒１５〜１７が列状に配置されている。   Unlike the tool 1 according to the first embodiment, the tool 2 according to the present embodiment is provided with a groove-shaped recess 13 instead of the recess 6 that is a hemispherical recess. In addition, three large-diameter abrasive grains 15 to 17 are arranged in a row in the concave portion 13.

凹部１３は、先端面５ａにおける回転中心点５ｃを通る直線状に形成されている。３つの大径砥粒１５〜１７は、凹部１３に入り込むことにより、列状に配置されている。３つの大径砥粒１５〜１７のうち、少なくとも１つは回転中心点５ｃに配置されている。例えば、３つの大径砥粒１５〜１７のうち、真ん中に位置する大径砥粒１６が、回転中心点５ｃに配置されている。なお、大径砥粒１６は、少なくとも一部が回転中心点５ｃに配置されていればよく、大径砥粒１６の中心が回転中心点５ｃに配置されていなくてもよい。大径砥粒１５〜１７の粒径は、第１実施形態に係る大径砥粒１１の粒径と同様である。大径砥粒１５〜１７は、一直線状に並んでいなくてもよく、任意の一直線上から互いにずれた位置に配置されていてもよい。また、大径砥粒１５〜１７は、回転軸線Ａの方向に積み上げられることで、全てが回転軸線Ａ上に並ぶように配置されていてもよい。   The concave portion 13 is formed in a straight line passing through the rotation center point 5c on the tip surface 5a. The three large-diameter abrasive grains 15 to 17 are arranged in a row by entering the recess 13. At least one of the three large-diameter abrasive grains 15 to 17 is disposed at the rotation center point 5c. For example, among the three large-diameter abrasive grains 15 to 17, the large-diameter abrasive grain 16 located in the middle is disposed at the rotation center point 5c. The large-diameter abrasive grains 16 are only required to be at least partially disposed at the rotation center point 5c, and the center of the large-diameter abrasive grains 16 may not be disposed at the rotation center point 5c. The particle diameters of the large diameter abrasive grains 15 to 17 are the same as the particle diameter of the large diameter abrasive grains 11 according to the first embodiment. The large-diameter abrasive grains 15 to 17 may not be arranged in a straight line, and may be arranged at positions shifted from each other on an arbitrary straight line. Further, the large-diameter abrasive grains 15 to 17 may be arranged so as to all be aligned on the rotation axis A by being stacked in the direction of the rotation axis A.

なお、本実施形態に係る工具２の製造方法は、第１実施形態に係る工具１の製造方法と同様である。まず、台金４の先端部分５における凹部１３に接着剤を塗布すると共に、当該凹部１３に大径砥粒１５〜１７を付着させる。続いて、台金４の先端部分５の全体にロウ材Ｒを貼り付ける。続いて、台金４の先端部分５の全体に接着剤を塗布すると共に、当該全体に主砥粒９を分散配置する。そして、真空ロウ付けを行い、大径砥粒１５〜１７及び主砥粒９を台金４の先端部分５に固着する。   In addition, the manufacturing method of the tool 2 which concerns on this embodiment is the same as the manufacturing method of the tool 1 which concerns on 1st Embodiment. First, an adhesive is applied to the concave portion 13 in the distal end portion 5 of the base metal 4, and large-diameter abrasive grains 15 to 17 are attached to the concave portion 13. Subsequently, the brazing material R is attached to the entire tip portion 5 of the base metal 4. Subsequently, an adhesive is applied to the entire front end portion 5 of the base metal 4, and the main abrasive grains 9 are dispersedly arranged over the whole. Then, vacuum brazing is performed, and the large-diameter abrasive grains 15 to 17 and the main abrasive grains 9 are fixed to the tip portion 5 of the base metal 4.

以上、本実施形態に係る工具２によれば、主砥粒９の径よりも大きな径の大径砥粒１５〜１７の少なくとも１つが、台金４の先端面５ａの回転中心点５ｃに配置されている。大径砥粒１５〜１７の径は主砥粒９の径よりも大きいので、主砥粒９に比して、台金４の先端面５ａの回転中心点５ｃに配置し易く、且つ、先端面５ａから外れ難い。そして、大径砥粒１５〜１７の少なくとも１つがこのように回転中心点５ｃに配置されていることにより、従来のバラマキ法によりロウ付けされた工具に比して、工具寿命を安定化することができる。   As described above, according to the tool 2 according to the present embodiment, at least one of the large-diameter abrasive grains 15 to 17 having a diameter larger than the diameter of the main abrasive grain 9 is disposed at the rotation center point 5 c of the tip surface 5 a of the base metal 4. Has been. Since the diameters of the large-diameter abrasive grains 15 to 17 are larger than the diameter of the main abrasive grains 9, the diameters of the large-diameter abrasive grains 15 to 17 are easier to dispose at the rotation center point 5 c of the distal end surface 5 a of the base metal 4 than the main abrasive grains 9. It is difficult to come off from the surface 5a. And, by arranging at least one of the large-diameter abrasive grains 15 to 17 at the rotation center point 5c in this way, the tool life can be stabilized as compared with the tool brazed by the conventional balamaki method. Can do.

また、工具２によれば、台金４の先端面５ａの回転中心点５ｃには、溝状の凹部１３が形成されている。よって、この凹部１３により、回転中心点５ｃにおける大径砥粒１１の配置を、より簡易且つ安定して行うことができる。   Further, according to the tool 2, a groove-like recess 13 is formed at the rotation center point 5 c of the tip surface 5 a of the base 4. Therefore, the concave portion 13 makes it possible to more easily and stably arrange the large-diameter abrasive grains 11 at the rotation center point 5c.

また、工具２によれば、複数の大径砥粒１５〜１７が、列状に配置されているので、ロウ付けによる大径砥粒１５〜１７の保持力を高めることができる。その結果、工具２の切れ味が安定し、工具寿命を延ばすことが可能となる。   Moreover, according to the tool 2, since the several large diameter abrasive grains 15-17 are arrange | positioned at row | line | column, the retention strength of the large diameter abrasive grains 15-17 by brazing can be raised. As a result, the sharpness of the tool 2 is stabilized and the tool life can be extended.

（第３実施形態）
次に、第３実施形態に係るロウ付け穴あけ工具の構成について、図７及び図８を用いて説明する。図７は、本発明の第３実施形態に係るロウ付け穴あけ工具の先端部分を示す概略側断面図である。図８は、図７のロウ付け穴あけ工具の先端部分を示す概略平面図である。ただし、図７及び図８においては、ロウ付け法により貼り付けられるロウ材の図示を省略すると共に、図８においては、主砥粒９の図示を省略している。 (Third embodiment)
Next, the structure of the brazing drilling tool according to the third embodiment will be described with reference to FIGS. FIG. 7 is a schematic cross-sectional side view showing a tip portion of a brazing drilling tool according to a third embodiment of the present invention. FIG. 8 is a schematic plan view showing a tip portion of the brazing drilling tool of FIG. However, in FIG.7 and FIG.8, illustration of the brazing material affixed by the brazing method is abbreviate | omitted, and illustration of the main abrasive grain 9 is abbreviate | omitted in FIG.

図７及び図８に示すように、本実施形態に係るロウ付け穴あけ工具３（以下、単に「工具３」という。）も、第１実施形態に係る工具１同様、台金４の先端部分５に、工具１の回転軸線Ａに平行な直線に交差する先端面５ａと、回転軸線Ａの方向に略平行に沿う外周面５ｂとが含まれる。先端面５ａは、突出した半球状に形成され、回転軸線Ａと交わる工具１の回転中心点５ｃを有している。また、主砥粒９が、台金４の先端部分５の全体に分散配置され、先端面５ａと外周面５ｂとに亘り、略均一に分布している。   As shown in FIGS. 7 and 8, the brazing hole drilling tool 3 (hereinafter simply referred to as “tool 3”) according to the present embodiment is the same as the tool 1 according to the first embodiment. In addition, a tip surface 5a that intersects a straight line parallel to the rotation axis A of the tool 1 and an outer peripheral surface 5b that is substantially parallel to the direction of the rotation axis A are included. The tip surface 5 a is formed in a protruding hemispherical shape and has a rotation center point 5 c of the tool 1 that intersects the rotation axis A. Further, the main abrasive grains 9 are distributed and disposed over the entire tip portion 5 of the base metal 4 and are distributed substantially uniformly over the tip surface 5a and the outer peripheral surface 5b.

本実施形態に係る工具３は、第１実施形態に係る工具１と異なり、半球状の窪みである凹部６の代わりに、当該凹部６の径よりも大きい径を有する半球状の凹部１８が形成されている。また、当該凹部１８には、５つの大径砥粒１９〜２３が島状かつ多層に配置されている。ここで、島状に配置されているとは、複数の大径砥粒が、１つの塊のように密集して配置されていることをいい、多層に配置されているとは、複数の大径砥粒が、回転軸線Ａ方向に沿って積み上げられるように配置されていることをいう。   Unlike the tool 1 according to the first embodiment, the tool 3 according to the present embodiment is formed with a hemispherical recess 18 having a diameter larger than the diameter of the recess 6 instead of the recess 6 that is a hemispherical depression. Has been. Further, in the concave portion 18, five large-diameter abrasive grains 19 to 23 are arranged in an island shape and in multiple layers. Here, being arranged in an island shape means that a plurality of large-diameter abrasive grains are densely arranged like one lump, and being arranged in multiple layers means that a plurality of large-diameter abrasive grains are arranged in multiple layers. The diameter abrasive grains are arranged so as to be stacked along the direction of the rotation axis A.

凹部１８は、先端面５ａにおける回転中心点５ｃに配置されている。５つの大径砥粒１９〜２３は、凹部１８に入り込むことにより、多層且つ島状に配置されている。５つの大径砥粒１９〜２３のうち、少なくとも１つの大径砥粒が回転中心点５ｃに配置されている。例えば、大径砥粒１９が回転中心点５ｃに配置されている。その他の４つの大径砥粒２０〜２３は、回転中心点５ｃの付近で、当該大径砥粒１９を覆うように並置されている。大径砥粒１９は、大径砥粒２０〜２３に覆われることにより、大径砥粒２０〜２３よりも内側層に配置され、大径砥粒２０〜２３は、大径砥粒１９よりも外側層に配置されている。すなわち、大径砥粒１９と大径砥粒２０〜２３とは多層に配置されている。また、大径砥粒２０〜２３は、輪を描くように島状に配置されている。大径砥粒１９〜２３の粒径は、第１実施形態に係る大径砥粒１１の粒径と同様である。なお、大径砥粒１９は、少なくとも一部が回転中心点５ｃに配置されていればよく、大径砥粒１９の中心が回転中心点５ｃに配置されていなくてもよい。また、回転中心点５ｃに配置されるのは、１つの大径砥粒１９に限られず、大径砥粒１９〜２３のうちのいずれか１つ以上であればよい。   The recess 18 is disposed at the rotation center point 5c on the tip surface 5a. The five large-diameter abrasive grains 19 to 23 are arranged in multiple layers and islands by entering the recess 18. Among the five large-diameter abrasive grains 19 to 23, at least one large-diameter abrasive grain is disposed at the rotation center point 5c. For example, the large-diameter abrasive grain 19 is disposed at the rotation center point 5c. The other four large diameter abrasive grains 20 to 23 are juxtaposed so as to cover the large diameter abrasive grains 19 in the vicinity of the rotation center point 5c. The large-diameter abrasive grains 19 are covered with the large-diameter abrasive grains 20 to 23 so as to be disposed in the inner layer of the large-diameter abrasive grains 20 to 23, and the large-diameter abrasive grains 20 to 23 are larger than the large-diameter abrasive grains 19. Is also arranged in the outer layer. That is, the large diameter abrasive grains 19 and the large diameter abrasive grains 20 to 23 are arranged in multiple layers. Moreover, the large diameter abrasive grains 20 to 23 are arranged in an island shape so as to draw a ring. The particle diameters of the large diameter abrasive grains 19 to 23 are the same as the particle diameter of the large diameter abrasive grains 11 according to the first embodiment. The large-diameter abrasive grains 19 need only be at least partially disposed at the rotation center point 5c, and the center of the large-diameter abrasive grains 19 may not be disposed at the rotation center point 5c. Moreover, what is arrange | positioned in the rotation center point 5c is not restricted to the one large diameter abrasive grain 19, What is necessary is just one or more of the large diameter abrasive grains 19-23.

なお、本実施形態に係る工具３の製造方法は、第１実施形態に係る工具１の製造方法と同様である。まず、台金４の先端部分５における凹部１８に接着剤を塗布すると共に、当該凹部１８に大径砥粒１９〜２３を付着させる。続いて、台金４の先端部分５の全体にロウ材Ｒを貼り付ける。続いて、台金４の先端部分５の全体に接着剤を塗布すると共に、当該全体に主砥粒９を分散配置する。そして、真空ロウ付けを行い、大径砥粒１９〜２３及び主砥粒９を台金４の先端部分５に固着する。   In addition, the manufacturing method of the tool 3 which concerns on this embodiment is the same as the manufacturing method of the tool 1 which concerns on 1st Embodiment. First, an adhesive is applied to the concave portion 18 at the distal end portion 5 of the base metal 4, and the large-diameter abrasive grains 19 to 23 are attached to the concave portion 18. Subsequently, the brazing material R is attached to the entire tip portion 5 of the base metal 4. Subsequently, an adhesive is applied to the entire front end portion 5 of the base metal 4, and the main abrasive grains 9 are dispersedly arranged over the whole. Then, vacuum brazing is performed, and the large diameter abrasive grains 19 to 23 and the main abrasive grains 9 are fixed to the tip portion 5 of the base metal 4.

以上、本実施形態に係る工具３においても、主砥粒９の径よりも大きな径の大径砥粒１９が、台金４の先端面５ａの回転中心点５ｃに配置されている。大径砥粒１９の径は主砥粒９の径よりも大きいので、主砥粒９に比して、台金４の先端面５ａの回転中心点５ｃに配置し易く、且つ、先端面５ａから外れ難い。そして、大径砥粒１９がこのように回転中心点５ｃに配置されていることにより、従来のバラマキ法によりロウ付けされた工具に比して、工具寿命を安定化することができる。   As described above, also in the tool 3 according to the present embodiment, the large-diameter abrasive grains 19 having a diameter larger than the diameter of the main abrasive grains 9 are arranged at the rotation center point 5 c of the tip surface 5 a of the base metal 4. Since the diameter of the large-diameter abrasive grain 19 is larger than the diameter of the main abrasive grain 9, it is easier to arrange at the rotation center point 5 c of the tip end face 5 a of the base metal 4 than the main abrasive grain 9 and the tip end face 5 a. Hard to come off. Since the large-diameter abrasive grains 19 are thus arranged at the rotation center point 5c, the tool life can be stabilized as compared with a tool brazed by the conventional balamaki method.

また、工具３によれば、複数の大径砥粒１９〜２３が、島状に配置されているので、ロウ付けによる大径砥粒１９〜２３の保持力を高めることができる。その結果、工具３の切れ味が安定し、工具寿命を延ばすことが可能となる。   Moreover, according to the tool 3, since the several large diameter abrasive grains 19-23 are arrange | positioned at island shape, the retention strength of the large diameter abrasive grains 19-23 by brazing can be improved. As a result, the sharpness of the tool 3 is stabilized and the tool life can be extended.

また、工具３によれば、複数の大径砥粒１９〜２３が、多層に配置されているので、例えば複数の大径砥粒１９〜２３のうち回転中心点５ｃに配置される大径砥粒１９を内側層に配置することができる。その結果、外側層に配置される大径砥粒２０〜２３のいずれかが台金４の先端面５ａから外れても、内側層において回転中心点５ｃに配置される大径砥粒１９を先端面５ａに保持でき、工具寿命を延ばすことが可能となる。   Moreover, according to the tool 3, since the several large diameter abrasive grains 19-23 are arrange | positioned in multiple layers, the large diameter abrasive | polishing arrange | positioned in the rotation center point 5c among the several large diameter abrasive grains 19-23, for example. Grains 19 can be placed in the inner layer. As a result, even if any of the large-diameter abrasive grains 20 to 23 arranged in the outer layer is detached from the distal end surface 5a of the base metal 4, the large-diameter abrasive grains 19 arranged at the rotation center point 5c in the inner layer are advanced. It can be held on the surface 5a, and the tool life can be extended.

以上、本実施形態の好適な実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、各請求項に記載した要旨を変更しない範囲で変形し、又は他のものに適用したものであってもよい。   The preferred embodiments of the present embodiment have been described above. However, the present invention is not limited to the above-described embodiments. The present invention is not limited to the gist described in each claim and can be modified or applied to others. It may be what you did.

複数の大径砥粒１５〜１７，１９〜２３の配置は、少なくとも１つの大径砥粒が台金４の先端面５ａの回転中心点５ｃに配置されている限り、上記に挙げた配置以外の種々の配置を取り得る。例えば、先端面５ａの回転中心点５ｃを中心とする十字状に配置してもよいし、配置に合わせて凹部１３，１８の形状を変形してもよい。また、島状且つ多層に限られず、列状且つ多層に配置してもよく、単に島状又は多層に配置してもよい。また、凹部６，１３，１８は必ずしも形成されていなくてもよい。   The arrangement of the plurality of large-diameter abrasive grains 15 to 17 and 19 to 23 is other than the arrangement described above as long as at least one large-diameter abrasive grain is arranged at the rotation center point 5c of the distal end surface 5a of the base metal 4. Various arrangements can be taken. For example, you may arrange | position in the cross shape centering on the rotation center point 5c of the front end surface 5a, and may deform | transform the shape of the recessed parts 13 and 18 according to arrangement | positioning. Moreover, it is not limited to islands and multilayers, but may be arranged in rows and multilayers, or simply in islands or multilayers. Further, the recesses 6, 13, and 18 are not necessarily formed.

また、回転中心点５ｃに配置される大径砥粒１１，１５〜１７，１９〜２３は、砥粒を外向けに切れ刃が立つように固着してもよい。大径砥粒１１，１５〜１７，１９〜２３の形状は特に限られず、円柱又は角柱等の柱状であってもよい。   Further, the large-diameter abrasive grains 11, 15 to 17, and 19 to 23 arranged at the rotation center point 5c may be fixed so that the abrasive grains stand outward with a cutting edge. The shape of the large-diameter abrasive grains 11, 15 to 17, and 19 to 23 is not particularly limited, and may be a columnar shape such as a cylinder or a prism.

また、大径砥粒１１、複数の大径砥粒１５〜１７の少なくとも１つ、及び、複数の大径砥粒１９〜２３の少なくとも１つは、凹部６，１３，１８が形成されていない台金４の先端面５ａの回転中心点５ｃに配置されていてもよい。   Further, at least one of the large-diameter abrasive grain 11, the plurality of large-diameter abrasive grains 15 to 17, and at least one of the plurality of large-diameter abrasive grains 19 to 23 is not formed with the recesses 6, 13, and 18. You may arrange | position at the rotation center point 5c of the front end surface 5a of the base metal 4. FIG.

［実施例］
以下、少なくとも１つの大径砥粒が台金４の先端面５ａの回転中心点５ｃに配置されていることによる効果を説明すべく、本発明者が実施した実施例について説明する。なお、本発明は以下の実施例に限定されるものではない。 [Example]
Hereinafter, in order to explain the effect of the arrangement of at least one large-diameter abrasive grain at the rotation center point 5c of the tip surface 5a of the base metal 4, an embodiment implemented by the present inventor will be described. In addition, this invention is not limited to a following example.

（実施例１）
実施例１では、上記第１実施形態のように、大径砥粒１１を回転中心点５ｃに配置したロウ付け穴あけ工具１を用いて（図２及び図３参照）、タイル穿孔試験を行った。試験条件は、防水パンに水を張り、タイルを水没させた状態で下向き穿孔を行ういわゆる湿式条件であった。工具が継続してタイルに穿つことができる孔の数（以降、単に「穿孔数」という。）を測定した。実施例１では、穿孔数が５０になった場合に目標性能達成として穿孔を中止し、測定結果を５０とした。
（実施例２〜５）
実施例２〜５では、上記第２実施形態のように、少なくとも１つの大径砥粒１６が回転中心点５ｃに配置されるように、３つの大径砥粒１５〜１７を列状に配置したロウ付け穴あけ工具２を用いて（図５及び図６参照）、タイル穿孔試験を行い、穿孔数を測定した。試験条件は、実施例１と同様、いわゆる湿式条件であった。実施例１と同様、穿孔数が５０になった場合に目標性能達成として穿孔を中止し、測定結果を５０とした。 Example 1
In Example 1, the tile drilling test was performed using the brazing drilling tool 1 in which the large-diameter abrasive grains 11 are arranged at the rotation center point 5c as in the first embodiment (see FIGS. 2 and 3). . The test conditions were so-called wet conditions in which water is applied to a waterproof pan, and downward drilling is performed with the tiles submerged. The number of holes that the tool can continuously pierce in the tile (hereinafter simply referred to as “the number of holes”) was measured. In Example 1, when the number of perforations reached 50, the perforation was stopped to achieve the target performance, and the measurement result was set to 50.
(Examples 2 to 5)
In Examples 2 to 5, three large-diameter abrasive grains 15 to 17 are arranged in a row so that at least one large-diameter abrasive grain 16 is arranged at the rotation center point 5c as in the second embodiment. Using the brazed drilling tool 2 (see FIGS. 5 and 6), a tile drilling test was performed and the number of drilled holes was measured. The test conditions were so-called wet conditions as in Example 1. As in Example 1, when the number of perforations reached 50, the perforation was stopped to achieve the target performance, and the measurement result was set to 50.

（比較例１〜６）
比較例１〜６では、台金の先端面の回転中心点に大径砥粒が配置されておらず、いわゆるバラマキ法により主砥粒（ダイヤモンド砥粒）のみが分散配置された従来のロウ付け穴あけ工具を用いて、タイル穿孔試験を行い、穿孔数を測定した。試験条件は、実施例１〜５と同様、いわゆる湿式条件であった。比較例１〜６では、穿孔が不能となった場合に不能となる前までの穿孔数を測定結果とした。 (Comparative Examples 1-6)
In Comparative Examples 1 to 6, conventional brazing in which large-diameter abrasive grains are not arranged at the rotation center point of the tip surface of the base metal, and only main abrasive grains (diamond abrasive grains) are dispersedly arranged by a so-called balamaki method. A tile drilling test was performed using a drilling tool, and the number of drilled holes was measured. The test conditions were so-called wet conditions as in Examples 1-5. In Comparative Examples 1 to 6, the number of perforations until the perforation was disabled when the perforation was disabled was used as the measurement result.

（実験結果）
実施例１〜５及び比較例１〜６のロウ付け穴あけ工具を用いてタイル穿孔試験を行った結果を図９及び図１０に示す。図９は、実施例に係るロウ付け穴あけ工具によるタイル穿孔試験結果を示す表である。図９の表に示す穿孔数は、実施例１〜５のタイル穿孔試験による穿孔数の測定結果を示している。図１０は比較例に係るロウ付け穴あけ工具によるタイル穿孔試験結果を示す表である。図１０の表に示す穿孔数は、比較例１〜６のタイル穿孔試験による穿孔数の測定結果を示している。 (Experimental result)
The result of having performed the tile drilling test using the brazing drilling tools of Examples 1 to 5 and Comparative Examples 1 to 6 is shown in FIGS. FIG. 9 is a table showing a tile drilling test result by the brazing drilling tool according to the example. The number of perforations shown in the table of FIG. 9 indicates the measurement result of the number of perforations by the tile perforation test of Examples 1 to 5. FIG. 10 is a table showing a tile drilling test result using a brazing drilling tool according to a comparative example. The number of perforations shown in the table of FIG. 10 indicates the measurement result of the number of perforations by the tile perforation test of Comparative Examples 1-6.

図９に示すように、実施例１〜５のいずれの場合も、穿孔数の測定結果は５０であった。すなわち、穿孔数を５０とする目標性能をいずれも達成していた。したがって、バラマキ法によりロウ付けされた工具に比して、工具寿命がばらつきのない安定したものとなった。   As shown in FIG. 9, the measurement result of the number of perforations was 50 in any of Examples 1 to 5. That is, all of the target performances with 50 perforations were achieved. Therefore, the tool life is stable with no variation compared to a tool brazed by the Baraki method.

これに対し、図１０に示すように、比較例１〜６に係るロウ付け穴あけ工具の場合、穿孔数がいずれも５０未満であった。すなわち、比較例１〜６では、目標性能を達成することができなかった。また、比較例１〜６に係るロウ付け穴あけ工具の場合、穿孔が不能となるまでの穿孔数にばらつきがあった。このように、従来のバラマキ法では個々の主砥粒の位置を制御できないことから、工具寿命にばらつきが生じた。   On the other hand, as shown in FIG. 10, in the case of the brazing drilling tools according to Comparative Examples 1 to 6, the number of perforations was less than 50. That is, in Comparative Examples 1 to 6, the target performance could not be achieved. Further, in the case of the brazing hole drilling tools according to Comparative Examples 1 to 6, there was a variation in the number of drilling holes until the drilling became impossible. Thus, since the position of each main abrasive grain cannot be controlled by the conventional balamaki method, the tool life varies.

以上、実施例１〜５及び比較例１〜６のロウ付け穴あけ工具を用いてタイル穿孔試験を行った結果、少なくとも１つの大径砥粒が回転中心点５ｃに配置されるロウ付け穴あけ工具を用いることにとり、従来のバラマキ法によりロウ付けされた工具に比して、工具寿命を安定化することができるという効果が確認された。   As described above, as a result of performing the tile drilling test using the brazing drilling tools of Examples 1 to 5 and Comparative Examples 1 to 6, the brazing drilling tool in which at least one large-diameter abrasive grain is arranged at the rotation center point 5c is obtained. As a result, it has been confirmed that the tool life can be stabilized as compared with a tool brazed by the conventional balamaki method.

１，２，３…ロウ付け穴あけ工具、４…台金、５…先端部分、９…主砥粒、１１，１５〜１７，１９〜２３…大径砥粒、５ａ…先端面、５ｃ…回転中心点、６，１３，１８…凹部。

1, 2, 3 ... brazing drilling tool, 4 ... base metal, 5 ... tip portion, 9 ... main abrasive, 11, 15-17, 19-23 ... large diameter abrasive, 5a ... tip surface, 5c ... rotation Center point, 6, 13, 18 ... concave.

Claims (4)

回転される台金の先端部分に超砥粒がロウ付けされたロウ付け穴あけ工具であって、
前記超砥粒は、前記台金の先端部分に分散配置される主砥粒と、前記主砥粒よりも大径である１又は複数の大径砥粒とを含み、
前記大径砥粒の少なくとも１つは、前記台金の先端面の回転中心点に配置されている、
ロウ付け穴あけ工具。 A brazing drilling tool in which superabrasive grains are brazed to the tip of a rotating base metal,
The superabrasive grains include main abrasive grains that are dispersedly arranged at the tip portion of the base metal, and one or more large-diameter abrasive grains that have a larger diameter than the main abrasive grains,
At least one of the large-diameter abrasive grains is disposed at the rotation center point of the tip surface of the base metal.
Brazing hole drilling tool. 前記台金の先端面の回転中心点には、凹部が形成されている、
請求項１に記載のロウ付け穴あけ工具。 A concave portion is formed at the rotation center point of the tip surface of the base metal.
The brazing drilling tool according to claim 1. 複数の前記大径砥粒が、列状又は島状に配置されている、
請求項１又は２に記載のロウ付け穴あけ工具。 A plurality of the large-diameter abrasive grains are arranged in rows or islands,
The brazing drilling tool according to claim 1 or 2. 複数の前記大径砥粒が、多層に配置されている、
請求項１〜３に記載の何れか一項に記載のロウ付け穴あけ工具。 A plurality of the large-diameter abrasive grains are arranged in multiple layers,
The brazing drilling tool according to any one of claims 1 to 3.
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Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH01135602A (en) * 1987-11-20 1989-05-29 Sanwa Daiyamondo Kogyo Kk Boring bit
JPH10128668A (en) * 1996-10-29 1998-05-19 Alps Electric Co Ltd Super-abrasive grain grinding wheel and its manufacture
JP2002239919A (en) * 2000-12-14 2002-08-28 Tenryu Saw Mfg Co Ltd Metal bond drilling and boring tool
JP2009269095A (en) * 2008-04-30 2009-11-19 Noritake Super Abrasive Co Ltd Milling tool
JP2010076021A (en) * 2008-09-25 2010-04-08 Covalent Materials Corp Drilling tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01135602A (en) * 1987-11-20 1989-05-29 Sanwa Daiyamondo Kogyo Kk Boring bit
JPH10128668A (en) * 1996-10-29 1998-05-19 Alps Electric Co Ltd Super-abrasive grain grinding wheel and its manufacture
JP2002239919A (en) * 2000-12-14 2002-08-28 Tenryu Saw Mfg Co Ltd Metal bond drilling and boring tool
JP2009269095A (en) * 2008-04-30 2009-11-19 Noritake Super Abrasive Co Ltd Milling tool
JP2010076021A (en) * 2008-09-25 2010-04-08 Covalent Materials Corp Drilling tool

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