JP2016182764A - Core drill - Google Patents

Core drill Download PDF

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JP2016182764A
JP2016182764A JP2015064651A JP2015064651A JP2016182764A JP 2016182764 A JP2016182764 A JP 2016182764A JP 2015064651 A JP2015064651 A JP 2015064651A JP 2015064651 A JP2015064651 A JP 2015064651A JP 2016182764 A JP2016182764 A JP 2016182764A
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diameter
shank
head
core drill
diameter head
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JP6408407B2 (en
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恵一 藤原
Keiichi Fujiwara
恵一 藤原
智美 前原
Tomomi Maehara
智美 前原
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Kyocera Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a core drill for shortening a processing time, and reducing a residual core.SOLUTION: A core drill 1 of the present invention is a core drill having a shank 2 and a plurality of annular heads 3 having an abrasive grain on the tip on one end side of the shank, and among the annular heads, an outer diameter of a large diameter head 3a largest in the outer diameter, is 60%-75% of a diameter of a maximum processing circle, and the inner periphery of the large diameter head includes the center of the shank. A spot-facing hole can be efficiently processed by satisfying such a constitution.SELECTED DRAWING: Figure 1

Description

本発明は、ワークの加工に用いるコアドリルに関するものである。   The present invention relates to a core drill used for machining a workpiece.

コアドリルは、シャンクの先端に砥粒を有する単独の環状ヘッドを備えており、回転しながらワークに当接することによって、ワークに貫通孔や座ぐり穴を形成することができるものであり、加工効率を向上させるべく、種々の検討が為されている。   The core drill is equipped with a single annular head with abrasive grains at the tip of the shank. By rotating and abutting against the work, a through hole or counterbore can be formed in the work. Various studies have been made to improve the above.

実開平２−２７８１３号公報Japanese Utility Model Publication No. 2-27813 特開２００６−２９７５０７号公報JP 2006-297507 A

シャンクの先端に砥粒を有する単独の環状ヘッドを備えるコアドリルを用いて、所望の大きさの座ぐり穴を形成しようとしたとき、環状ヘッドの大きさが小さければ、加工時間が非常に長いものとなり、環状ヘッドが大きければ、所望の大きさの座ぐり穴の中心部が残ってしまう（以下、この部分を残留コアと記載する。）という問題があった。それ故、今般においては、加工時間が短く、残留コアの少ないコアドリルが求められている。   When trying to form a counterbore of the desired size using a core drill with a single annular head having abrasive grains at the tip of the shank, if the size of the annular head is small, the processing time is very long If the annular head is large, there is a problem that the center portion of the counterbore of a desired size remains (hereinafter, this portion is referred to as a residual core). Therefore, in recent years, there is a demand for a core drill with a short machining time and a small residual core.

本発明は、上記要求を満たすべく案出されたものであり、加工時間が短く、残留コアの少ないコアドリルを提供することを目的とする。   The present invention has been devised to satisfy the above requirements, and an object thereof is to provide a core drill having a short machining time and a small residual core.

本発明のコアドリルは、シャンクと、該シャンクの一端側に、先端に砥粒を有する複数の環状ヘッドとを備えるコアドリルであって、前記環状ヘッドのうち、最も外径の大きい大径ヘッドの外径が、最大加工円の直径の６０％以上７５％以下であり、前記大径ヘッドの内周が前記シャンクの中心を内包していることを特徴とするものである。   A core drill according to the present invention is a core drill including a shank and a plurality of annular heads having abrasive grains at one end side of the shank. Out of the annular heads, an outer diameter of a large-diameter head having the largest outer diameter is provided. The diameter is not less than 60% and not more than 75% of the diameter of the maximum processing circle, and the inner circumference of the large-diameter head includes the center of the shank.

本発明のコアドリルによれば、加工時間が短く、残留コアを少なくすることができるため、加工効率が向上する。   According to the core drill of the present invention, since the processing time is short and the residual core can be reduced, the processing efficiency is improved.

本実施形態のコアドリルの一例を模式的に示す、（ａ）は断面図であり、（ｂ）は底面図である。An example of the core drill of this embodiment is shown typically, (a) is a sectional view and (b) is a bottom view.

以下、本実施形態のコアドリルについて説明する。   Hereinafter, the core drill of this embodiment will be described.

図１は、本実施形態のコアドリルの一例を模式的に示す、（ａ）は断面図であり、（ｂ）は底面図である。   FIG. 1 schematically shows an example of a core drill of the present embodiment, where (a) is a cross-sectional view and (b) is a bottom view.

本実施形態のコアドリル１は、シャンク２と、シャンク２の一端側に、先端にダイヤモンドチップ等の砥粒を有する複数の環状ヘッド３とを備えるものであり、図１においては、大径ヘッド３ａと、小径ヘッド３ｂの２つを備えている例を示している。そして、本実
施形態のコアドリル１は、大径ヘッド３ａの外径が、最大加工円の直径の６０％以上７５％以下であり、大径ヘッド３ａの内周がシャンク２の中心Ｃを内包しているものである。 The core drill 1 according to this embodiment includes a shank 2 and a plurality of annular heads 3 having abrasive grains such as diamond chips at one end on one end side of the shank 2, and in FIG. And the example provided with two of the small diameter heads 3b is shown. In the core drill 1 of this embodiment, the outer diameter of the large-diameter head 3a is 60% or more and 75% or less of the diameter of the maximum machining circle, and the inner circumference of the large-diameter head 3a includes the center C of the shank 2. It is what.

なお、最大加工円の直径とは、環状ヘッド３が回転した際の加工円の直径のことであり、図１においては、シャンク２の直径とも言い換えることができる。また、本実施形態のコアドリル１においては、大径ヘッド３ａの外径が、シャンク２の外径の６０％以上７５％以下であり、大径ヘッド３ａの内周がシャンク２の中心Ｃを内包していれば、小径ヘッド３ｂは、１つに限らず、複数備えるものであっても構わない。さらに、図１においては、大径ヘッド３および小径ヘッド３ｂのいずれもがシャンク２の外周に内接したものを示しているが、最大加工円がシャンク２よりも大きいものであってもよい。   Note that the diameter of the maximum processing circle is the diameter of the processing circle when the annular head 3 is rotated, and can also be referred to as the diameter of the shank 2 in FIG. In the core drill 1 of the present embodiment, the outer diameter of the large-diameter head 3a is 60% or more and 75% or less of the outer diameter of the shank 2, and the inner periphery of the large-diameter head 3a includes the center C of the shank 2. If so, the small-diameter head 3b is not limited to one, and a plurality of small-diameter heads 3b may be provided. Further, in FIG. 1, both the large-diameter head 3 and the small-diameter head 3 b are shown inscribed in the outer periphery of the shank 2, but the maximum machining circle may be larger than that of the shank 2.

本実施形態のコアドリル１は、複数の環状ヘッドを備えていることにより、加工時間を短くすることができる。また、大径ヘッド３ａの外径が、シャンク２の外径の６０％以上７５％以下であり、大径ヘッド３ａの内周がシャンク２の中心を内包していることにより、残留コアを少なくすることができる。それ故、本実施形態のコアドリル１を用いれば、座ぐり穴を効率よく加工することができる。   The core drill 1 according to the present embodiment includes a plurality of annular heads, so that the processing time can be shortened. Further, the outer diameter of the large-diameter head 3a is 60% or more and 75% or less of the outer diameter of the shank 2, and the inner periphery of the large-diameter head 3a contains the center of the shank 2, thereby reducing the residual core. can do. Therefore, if the core drill 1 of this embodiment is used, a counterbore can be processed efficiently.

これに対し、大径ヘッド３ａの外径が、シャンク２の外径の６０％未満や、大径ヘッド３ａの内周がシャンク２の中心Ｃを内包していない場合には、大径ヘッド３ａの外径が小さかったり、大径ヘッド３ａの先端面に加工時に大きな面圧力が作用して加工抵抗が増加したりすることから、加工時間を短くすることができない。また、大径ヘッド３ａの外径が、シャンク２の外径の７５％を超えると、大径ヘッド３ａの内周と、シャンク２の中心Ｃとの距離が長くなることから、残留コアが残ることとなり、残留コアの除去のための追加工が必要となり、加工時間を短くすることができない。   On the other hand, when the outer diameter of the large-diameter head 3a is less than 60% of the outer diameter of the shank 2, or when the inner circumference of the large-diameter head 3a does not include the center C of the shank 2, the large-diameter head 3a. The processing time cannot be shortened because the outer diameter of the head is small or a large surface pressure acts on the tip surface of the large-diameter head 3a during processing to increase the processing resistance. Further, if the outer diameter of the large-diameter head 3a exceeds 75% of the outer diameter of the shank 2, the distance between the inner circumference of the large-diameter head 3a and the center C of the shank 2 becomes long, so a residual core remains. In other words, additional processing for removing the residual core is required, and the processing time cannot be shortened.

なお、加工抵抗を抑制して加工時間を短くするとともに、残留コアを少ないものとするには、大径ヘッド３ａの外径は、シャンク２の外径の６０％以上６５％以下であることが好適である。   Note that the outer diameter of the large-diameter head 3a is 60% or more and 65% or less of the outer diameter of the shank 2 in order to reduce the processing time by suppressing the processing resistance and reducing the residual core. Is preferred.

また、本実施形態のコアドリル１は、環状ヘッド３が、大径ヘッド３ａと小径ヘッド３ｂとの２つからなり、大径ヘッド３ａおよび小径ヘッド３ｂがいずれもシャンク２の外周に内接し、大径ヘッド３ａと小径ヘッド３ｂとの間隔が、シャンク２の外径の１．５％以上１０％以下であることが好適である。   Further, in the core drill 1 of the present embodiment, the annular head 3 is composed of a large-diameter head 3a and a small-diameter head 3b, and the large-diameter head 3a and the small-diameter head 3b are both inscribed on the outer periphery of the shank 2, The distance between the diameter head 3a and the small diameter head 3b is preferably 1.5% or more and 10% or less of the outer diameter of the shank 2.

環状ヘッド３が、大径ヘッド３ａと小径ヘッド３ｂとの２つからなることで、３つ以上であるときよりも、加工時において大径ヘッド３ａおよび小径ヘッド３ｂの先端面に掛かる加工抵抗を少なくすることができる。また、大径ヘッド３ａと小径ヘッド３ｂとの間隔が、シャンク２の外径の１．５％以上１０％以下であることにより、小径ヘッド３ｂによる研削量を多くしつつ、上記間隔により加工屑の堆積領域を有していることから、座ぐり穴をさらに効率よく加工することができる。   Since the annular head 3 includes the large-diameter head 3a and the small-diameter head 3b, the processing resistance applied to the tip surfaces of the large-diameter head 3a and the small-diameter head 3b at the time of processing is greater than when there are three or more. Can be reduced. In addition, since the interval between the large-diameter head 3a and the small-diameter head 3b is 1.5% or more and 10% or less of the outer diameter of the shank 2, the amount of grinding by the small-diameter head 3b is increased and the above-mentioned interval causes machining waste. Therefore, the counterbore can be processed more efficiently.

また、コアドリル１においては、図１に示すように、シャンク２内を通って加工部分に液体（例えば、水）を供給可能な供給口４を有していることが好適である。座ぐり穴の加工時において、供給口４から液体を供給すれば、加工熱の冷却効果のみならず、加工屑を除去しやすくなるとともに、大径ヘッド３ａおよび小径ヘッド３ｂへの加工屑の付着が少なくなることから、座ぐり穴をさらに効率よく加工することができる。   Moreover, in the core drill 1, as shown in FIG. 1, it is suitable to have the supply port 4 which can supply a liquid (for example, water) to the process part through the shank 2. As shown in FIG. If a liquid is supplied from the supply port 4 at the time of counterbore hole processing, not only the cooling effect of the processing heat but also processing scraps can be easily removed, and the processing scraps adhere to the large-diameter head 3a and the small-diameter head 3b. Therefore, the counterbore can be processed more efficiently.

そして、本実施形態のコアドリル１のシャンク２の材質としては、炭素鋼（Ｓ１５Ｃ，Ｓ４５Ｃ、Ｓ５０Ｃ，Ｓ５５Ｃ，Ｓ６０Ｃ）、炭素工具鋼（ＳＫ２，ＳＫ４，ＳＫ５，ＳＫ６，ＳＫ７）および合金工具鋼（ＳＫＳ２，ＳＫＳ７，ＳＫＳ５１）を用いることがで
きる。また、環状ヘッド３については、シャンク２と同材質のリング形状の金属部材表面にダイヤモンドチップ等の砥粒を電着によって接着し、溶接やボルト絞めなどの方法によりシャンク２の端面に取り付ければよい。 And as a material of the shank 2 of the core drill 1 of this embodiment, carbon steel (S15C, S45C, S50C, S55C, S60C), carbon tool steel (SK2, SK4, SK5, SK6, SK7) and alloy tool steel (SKS2). , SKS7, SKS51) can be used. In addition, the annular head 3 may be attached to the end face of the shank 2 by a method such as welding or bolt tightening by adhering abrasive grains such as a diamond tip to the surface of a ring-shaped metal member made of the same material as the shank 2. .

１：コアドリル
２：シャンク
３：環状ヘッド
３ａ：大径ヘッド
３ｂ：小径ヘッド
４：供給口 1: Core drill 2: Shank 3: Annular head 3a: Large-diameter head 3b: Small-diameter head 4: Supply port

Claims (2)

シャンクと、該シャンクの一端側に、先端に砥粒を有する複数の環状ヘッドとを備えるコアドリルであって、前記環状ヘッドのうち、最も外径の大きい大径ヘッドの外径が、最大加工円の直径の６０％以上７５％以下であり、前記大径ヘッドの内周が前記シャンクの中心を内包していることを特徴とするコアドリル。   A core drill comprising a shank and a plurality of annular heads having abrasive grains on one end side of the shank, wherein the outer diameter of a large-diameter head having the largest outer diameter is the maximum processing circle A core drill characterized by having a diameter of 60% or more and 75% or less of the diameter, and an inner periphery of the large-diameter head includes a center of the shank. 前記環状ヘッドが、前記大径ヘッドと小径ヘッドとの２つからなり、前記大径ヘッドおよび前記小径ヘッドがいずれも前記シャンクの外周に内接し、前記大径ヘッドと前記小径ヘッドとの間隔が、前記シャンクの外径の１．５％以上１０％以下であることを特徴とする請求項１に記載のコアドリル。   The annular head comprises two of the large diameter head and the small diameter head, both the large diameter head and the small diameter head are inscribed in the outer periphery of the shank, and the distance between the large diameter head and the small diameter head is The core drill according to claim 1, wherein the core drill has a diameter of 1.5% to 10% of the outer diameter of the shank.
JP2015064651A 2015-03-26 2015-03-26 Core drill Expired - Fee Related JP6408407B2 (en)

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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945445A (en) * 1973-10-15 1976-03-23 Tone Boring Company Limited Boring apparatus provided with drill bits freely rotatable around their own axis
JPS5541272U (en) * 1978-09-11 1980-03-17
US4230193A (en) * 1978-12-15 1980-10-28 Arthur G. Burki Rotary drill bit
GB2132252A (en) * 1982-10-25 1984-07-04 Tone Boring Co An air hammer drill device
JPS6353664U (en) * 1986-09-26 1988-04-11
JPH04132909U (en) * 1991-05-31 1992-12-10 株式会社不二越 coreless drill
JPH0539913U (en) * 1991-10-31 1993-05-28 京セラ株式会社 Grinding drilling tool
JPH05239982A (en) * 1991-09-27 1993-09-17 Norvic Sa Disc drill bit
JPH11320424A (en) * 1998-05-19 1999-11-24 Ebara Corp Grinding wheel for polishing substrate and polishing device
JP2006088303A (en) * 2004-09-27 2006-04-06 Kyocera Corp Tool for grinding work and device for grinding work
JP2011105560A (en) * 2009-11-19 2011-06-02 Nippon Electric Glass Co Ltd Core drill and drilling method of glass plate using the drill
WO2014129119A1 (en) * 2013-02-19 2014-08-28 Ｆｓテクニカル株式会社 Diameter-expanding drill bit
JP3204239U (en) * 2016-02-25 2016-05-26 株式会社花神鉄工所 Diamond tool for drilling

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945445A (en) * 1973-10-15 1976-03-23 Tone Boring Company Limited Boring apparatus provided with drill bits freely rotatable around their own axis
JPS5541272U (en) * 1978-09-11 1980-03-17
US4230193A (en) * 1978-12-15 1980-10-28 Arthur G. Burki Rotary drill bit
GB2132252A (en) * 1982-10-25 1984-07-04 Tone Boring Co An air hammer drill device
JPS6353664U (en) * 1986-09-26 1988-04-11
JPH04132909U (en) * 1991-05-31 1992-12-10 株式会社不二越 coreless drill
JPH05239982A (en) * 1991-09-27 1993-09-17 Norvic Sa Disc drill bit
JPH0539913U (en) * 1991-10-31 1993-05-28 京セラ株式会社 Grinding drilling tool
JPH11320424A (en) * 1998-05-19 1999-11-24 Ebara Corp Grinding wheel for polishing substrate and polishing device
JP2006088303A (en) * 2004-09-27 2006-04-06 Kyocera Corp Tool for grinding work and device for grinding work
JP2011105560A (en) * 2009-11-19 2011-06-02 Nippon Electric Glass Co Ltd Core drill and drilling method of glass plate using the drill
WO2014129119A1 (en) * 2013-02-19 2014-08-28 Ｆｓテクニカル株式会社 Diameter-expanding drill bit
JP3204239U (en) * 2016-02-25 2016-05-26 株式会社花神鉄工所 Diamond tool for drilling

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