JP2003117708A - Drill - Google Patents
DrillInfo
- Publication number
- JP2003117708A JP2003117708A JP2001317195A JP2001317195A JP2003117708A JP 2003117708 A JP2003117708 A JP 2003117708A JP 2001317195 A JP2001317195 A JP 2001317195A JP 2001317195 A JP2001317195 A JP 2001317195A JP 2003117708 A JP2003117708 A JP 2003117708A
- Authority
- JP
- Japan
- Prior art keywords
- tip
- drill
- cutting edge
- drill body
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばシリコンや
各種セラミックス、ガラス、あるいは炭化タングステン
（ＷＣ）などの超硬合金材を含む高硬度な脆性材料に穴
明け加工を行うのに用いて特に好適なドリルに関するも
のである。TECHNICAL FIELD The present invention is particularly suitable for use in drilling a high-hardness brittle material including, for example, silicon, various ceramics, glass, or a cemented carbide material such as tungsten carbide (WC). It's about a big drill.
【０００２】[0002]
【従来の技術】図６および図７は、一般的な金属材料へ
の穴明け加工に用いられるドリルを示すものであり、す
なわち軸線Ｏ回りにドリル回転方向Ｔに回転させられる
略円柱状のドリル本体１の先端部外周に、このドリル本
体１先端に開口する２条の切屑排出溝２，２が軸線Ｏに
関して対称に、ドリル本体１の後端側に向かうに従いド
リル回転方向Ｔの後方側に捩れるように形成されるとと
もに、ドリル本体１の先端には、これらの切屑排出溝
２，２の先端側開口縁からドリル回転方向Ｔの後方側に
向かうに従いドリル本体１の後端側に向かうように傾斜
させられ、かつ互いに軸線Ｏを含む平面上で交差させら
れた２つの先端面（先端逃げ面）３，３が形成されてお
り、これらの先端面３，３と切屑排出溝２，２とのドリ
ル回転方向Ｔ側の交差稜線がそれぞれ切刃４，４とさ
れ、また上記軸線Ｏを含む平面上で交差したこれら２つ
の先端面３，３同士の交差稜線は、切刃４，４の内終端
に連なるチゼル５とされている。なお、図示の例では、
ドリル本体１先端部外周のヒール側の部分が一段後退す
るように二番取りされていて、切屑排出溝２のドリル回
転方向Ｔ後方側に連なる部分にマージン６が形成されて
いる。2. Description of the Related Art FIGS. 6 and 7 show a drill used for drilling a general metal material, that is, a substantially cylindrical drill which can be rotated around an axis O in a drill rotation direction T. On the outer periphery of the tip of the main body 1, two chips discharging grooves 2 and 2 opening at the tip of the drill main body 1 are symmetrical with respect to the axis O and toward the rear side of the drill main body 1 toward the rear side in the drill rotation direction T. It is formed so as to be twisted, and at the tip of the drill body 1, it goes to the rear end side of the drill body 1 from the opening edge of the chip discharge grooves 2 and 2 toward the rear side in the drill rotation direction T. Two tip surfaces (tip flanks) 3 and 3 which are inclined and intersect each other on a plane including the axis O, the tip surfaces 3 and 3 and the chip discharge groove 2 are formed. Intersection on the T side of the drill rotation direction with 2 The ridge lines are the cutting edges 4 and 4, respectively, and the intersecting ridge lines of these two front end surfaces 3 and 3 intersecting each other on the plane including the axis O are the chisel 5 connected to the inner ends of the cutting edges 4 and 4. ing. In the example shown,
The heel side portion of the outer periphery of the tip end portion of the drill body 1 is secondly recessed so as to retreat one step, and a margin 6 is formed in a portion continuous to the rear side of the chip discharge groove 2 in the drill rotation direction T.
【０００３】[0003]
【発明が解決しようとする課題】ところが、このような
従来の一般的なドリルによってシリコンや各種セラミッ
クス、ガラス、あるいは炭化タングステン（ＷＣ）など
の超高合金材を含む高硬度な脆性材料に穴明け加工を行
おうとした場合、かかるドリルでは切屑排出溝２がドリ
ル本体１の後端側に向かうに従いドリル回転方向Ｔの後
方側に捩れるように形成されるとともに先端面３がドリ
ル回転方向Ｔの後方側に向かうに従いドリル本体１の後
端側に向かうように傾斜させられていることから、切刃
４の刃先角が図７に示すように鋭角側に鋭く設定される
ためにこの切刃４にチッピングが生じ易く、その結果ド
リル寿命が早期に費えてしまうことになる。また、切刃
４の刃先強度を確保してこのようなチッピングを防ぐた
め、図８および図９に示すように切刃４を面取りしてホ
ーニング面７を形成することも行われているが、このよ
うなドリルを製造する場合、あるいは再研磨する場合に
は、ドリル本体１の先端に上記先端面３，３を形成して
切刃４，４を研ぎ付けた後に、このホーニング面７を形
成するためのホーニング工程を各切刃４，４ごとに行わ
なければならず、製造工程が煩雑化することが避けられ
ないのは勿論、ホーニング工程が切刃４の形成工程とは
別工程となるために精度良くホーニング面７を形成する
ことが困難となるという問題も生じる。However, such a conventional general drill is used to drill a brittle material having a high hardness such as silicon, various ceramics, glass, or a super high alloy material such as tungsten carbide (WC). When machining is attempted, in such a drill, the chip discharge groove 2 is formed so as to be twisted rearward in the drill rotation direction T as it goes toward the rear end side of the drill body 1, and the tip end surface 3 is formed in the drill rotation direction T. Since the drill body 1 is inclined toward the rear end side toward the rear side, the cutting edge 4 is sharply set to the acute angle side as shown in FIG. Chipping is likely to occur, resulting in an early drill life. Further, in order to secure the edge strength of the cutting edge 4 and prevent such chipping, it is also practiced to chamfer the cutting edge 4 to form a honing surface 7 as shown in FIGS. 8 and 9. When manufacturing such a drill or when re-polishing, after forming the above-mentioned tip surfaces 3 and 3 at the tip of the drill body 1 and sharpening the cutting edges 4 and 4, this honing surface 7 is formed. The honing process must be performed for each of the cutting blades 4 and 4, and the manufacturing process is inevitably complicated, and the honing process is a separate process from the process of forming the cutting blade 4. Therefore, it is difficult to form the honing surface 7 with high accuracy.
【０００４】本発明は、このような背景の下になされた
もので、特にこれらシリコンや各種セラミックス、ガラ
ス、あるいは炭化タングステン（ＷＣ）などの超硬合金
材を含む高硬度な脆性材料に穴明け加工を行う際に、ホ
ーニング工程によって切刃にホーニングを施すことなく
切刃の刃先強度を確保してチッピング等の発生を防ぐこ
とが可能なドリルを提供することを目的としている。The present invention has been made under such a background, and in particular, drills holes in high hardness brittle materials including silicon, various ceramics, glass, and cemented carbide materials such as tungsten carbide (WC). An object of the present invention is to provide a drill capable of ensuring the cutting edge strength of a cutting edge without honing the cutting edge in a honing process and preventing the occurrence of chipping and the like when performing machining.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決して、こ
のような目的を達成するために、本発明は、軸線回りに
回転される略円柱状のドリル本体の先端部外周に、該ド
リル本体の先端に開口する複数条の切屑排出溝を形成す
るとともに、このドリル本体の先端には、上記軸線に対
して傾斜して交差し、かつ互いの交差稜線が上記切屑排
出溝の先端側開口縁に交差することなく上記ドリル本体
の外周に達する複数の先端面を形成して、これらの先端
面の上記交差稜線を切刃としたことを特徴とする。従っ
て、このようなドリルにおいては、軸線に対して傾斜し
た上記先端面間において周方向に隣接する先端面同士の
交差稜線に形成された上記切刃が、切屑排出溝の先端側
開口縁に交差することなくドリル本体の外周に到達させ
られているため、この切刃とされる交差稜線のドリル回
転方向側に連なる先端面が、このドリル回転方向に向か
うに従いドリル本体の後端側に傾斜することとなって、
切刃に沿って形成されたホーニング面として作用するの
で、切刃の刃先強度の確保を図ることができる。そし
て、このホーニング面として作用する先端面も、ドリル
本体先端に上記複数の先端面を形成して切刃を研ぎ付け
る際に同時に形成されるため、その後にホーニング工程
を要することがなく、製造工程の煩雑化や精度の劣化を
防ぐことができる。従って、このようなドリルは、その
切刃により、シリコンや各種セラミックス、ガラス、あ
るいは炭化タングステン（ＷＣ）などの超硬合金材を含
む高硬度な脆性材料よりなる加工物に加工穴を形成する
のに用いて、特に好適である。SUMMARY OF THE INVENTION In order to solve the above problems and achieve such an object, the present invention is directed to the outer periphery of the tip portion of a substantially cylindrical drill body rotated around an axis. A plurality of chips discharge grooves that open at the tip of the main body are formed, and the tip of the drill body intersects the axis at an inclination, and the intersecting ridge lines open at the tip side of the chip discharge groove. It is characterized in that a plurality of tip surfaces that reach the outer circumference of the drill body without intersecting the edges are formed, and the intersecting ridge lines of these tip surfaces are cutting edges. Therefore, in such a drill, the cutting edge formed on the intersecting ridge line between the tip surfaces adjacent to each other in the circumferential direction between the tip surfaces inclined with respect to the axis intersects the tip side opening edge of the chip discharge groove. Since it is made to reach the outer circumference of the drill body without doing so, the tip surface that is continuous to the drill rotation direction side of the intersecting ridge line that is regarded as this cutting edge inclines to the rear end side of the drill body as it goes in this drill rotation direction. That means
Since it acts as a honing surface formed along the cutting edge, it is possible to ensure the strength of the cutting edge. The tip surface that acts as this honing surface is also formed at the same time when the plurality of tip surfaces are formed at the tip of the drill body and the cutting blade is sharpened. It is possible to prevent complication and deterioration of accuracy. Therefore, such a drill uses its cutting edge to form a drilled hole in a workpiece made of high hardness brittle material including silicon, various ceramics, glass, or a cemented carbide material such as tungsten carbide (WC). Is particularly suitable for use in.
【０００６】ところで、このように脆性材料に加工穴を
形成する場合には、一般的な金属材料に加工穴を形成す
る場合のように切屑が弦巻状やチップ状に連続して生成
されることはなく、細かな粉体状の切粉となって生成・
排出されることとなる。そこで、特にそのような場合に
は、少なくとも上記ドリル本体先端の切刃部分に、硬質
炭素皮膜またはダイヤモンド電着砥粒層を被覆するのが
望ましく、この硬質炭素皮膜に成長したダイヤモンド等
の硬質炭素粒子やダイヤモンド電着砥粒層に含まれるダ
イヤモンド砥粒によってこれら硬質炭素皮膜やダイヤモ
ンド電着砥粒層の表面に微細かつ極めて硬質な凹凸が形
成され、この凹凸によって脆性材料の粉砕が促進されて
上述のような切粉を生成しつつ加工穴を確実に形成する
ことが可能となるとともに、刃先強度の一層の向上を図
ることができる。また、このような切粉を確実かつ効率
的に排出して円滑な穴明け加工を図るには、上記ドリル
本体の心厚を、上記切刃の外径Ｄに対して０．５Ｄ未満
として、切屑排出溝の断面積を大きく確保するのが望ま
しい。By the way, in the case of forming a machined hole in a brittle material in this manner, chips are continuously generated in a string shape or a chip shape as in the case of forming a machined hole in a general metal material. Instead, it produces fine powder chips.
It will be discharged. Therefore, particularly in such a case, it is desirable to coat at least the cutting edge portion of the tip of the drill body with a hard carbon coating or a diamond electrodeposition abrasive grain layer, and hard carbon such as diamond grown on this hard carbon coating. Fine and extremely hard irregularities are formed on the surface of these hard carbon film or diamond electrodeposition abrasive grain layer by the diamond abrasive grains contained in the particles or diamond electrodeposition abrasive grain layer, and the crushing of the brittle material is promoted by these irregularities. It is possible to surely form the processed hole while generating the cutting chips as described above, and it is possible to further improve the strength of the cutting edge. Further, in order to reliably and efficiently discharge such chips and achieve smooth drilling, the core thickness of the drill body is set to less than 0.5 D with respect to the outer diameter D of the cutting edge, It is desirable to secure a large cross-sectional area of the chip discharge groove.
【０００７】[0007]
【発明の実施の形態】図１ないし図３は、本発明の第１
の実施形態を示すものである。本実施形態においても、
ドリル本体１１の少なくとも先端部は軸線Ｏを中心とし
た略円柱状をなし、この軸線Ｏ回りにドリル回転方向Ｔ
に回転させられて穴明け加工に使用される。このドリル
本体１１の先端部外周には２条の切屑排出溝１２，１２
が軸線Ｏに関して対称に、ドリル本体１１の後端側に向
かうに従いドリル回転方向Ｔの後方側に捩れるように形
成されていて、ドリル本体１１の先端に開口させられて
いる。また、このドリル本体１１の先端部外周には、こ
れら切屑排出溝１２，１２のドリル回転方向Ｔの後方側
に連なるようにマージン１３，１３がそれぞれ形成され
ていて、このマージン１３のドリル回転方向Ｔ後方側の
ドリル本体１１先端外周には二番取りが施されてマージ
ン１３に対し内周側に一段後退するようにされている。1 to 3 show a first embodiment of the present invention.
FIG. Also in this embodiment,
At least the tip of the drill body 11 has a substantially cylindrical shape centered on the axis O, and the drill rotation direction T is defined around the axis O.
It is rotated and used for drilling. Two chip discharge grooves 12, 12 are provided on the outer circumference of the tip of the drill body 11.
Are formed so as to be symmetrical with respect to the axis O so as to be twisted rearward in the drill rotation direction T toward the rear end side of the drill body 11, and are opened at the tip of the drill body 11. Further, margins 13 and 13 are formed on the outer periphery of the tip of the drill body 11 so as to be continuous with the rear side of the chip discharge grooves 12 and 12 in the drill rotation direction T. The outer periphery of the tip of the drill body 11 on the rear side of T is doubled so as to be retracted one step toward the inner periphery side with respect to the margin 13.
【０００８】そして、さらにこのドリル本体１１の先端
には、本実施形態では２つの先端面１４，１４が軸線Ｏ
に対して傾斜して交差するように、かつやはり該軸線Ｏ
に対して対称となるように形成されている。ここで、こ
れらの先端面１４，１４は、本実施形態では軸線Ｏに斜
交する平面状に形成されたものであり、これにより該先
端面１４，１４同士の交差稜線Ｌは図３に示すように該
軸線Ｏに直交するように形成されることとなって、先端
面１４，１４は、この交差稜線Ｌに直交して軸線Ｏから
ドリル本体１１の外周側に向かう方向において該ドリル
本体１１の後端側に向かうように、互いに等しい角度で
傾斜させられている。Further, at the tip of the drill body 11, in the present embodiment, two tip surfaces 14, 14 are provided with the axis O.
With respect to the axis O
It is formed so as to be symmetrical with respect to. Here, in the present embodiment, these tip surfaces 14 and 14 are formed in a plane shape obliquely intersecting with the axis O, so that the intersecting ridge line L between the tip surfaces 14 and 14 is shown in FIG. As described above, the tip surfaces 14, 14 are formed so as to be orthogonal to the axis O, and the tip surfaces 14 and 14 are orthogonal to the intersecting ridge line L in the direction from the axis O toward the outer peripheral side of the drill body 11. Are inclined at equal angles to each other toward the rear end side.
【０００９】しかして、この交差稜線Ｌは、軸線Ｏ方向
先端側から見て図１に示すように、その中点が該軸線Ｏ
上に位置し、かつその両端が上記マージン１３上におい
てドリル本体１１の先端部外周に達する直線状に延設さ
れていて、切屑排出溝１２，１２の先端側開口縁には交
差したり接したりしないようになされており、この交差
稜線Ｌが本実施形態のドリルの切刃１５とされている。
言い換えれば、本実施形態のドリルでは、従来のドリル
の軸線Ｏ方向先端視においてチゼル５が切刃４に対して
なす交差角が１８０°とされることによりこのチゼル５
と切刃４とが一致させられてそのままドリル外周のマー
ジン６に達せられたような構成とされている。However, as shown in FIG. 1, the midpoint of the intersecting ridge line L, as seen from the tip end side in the direction of the axis O, is the axis O.
It is located on the upper side, and its both ends extend linearly so as to reach the outer periphery of the tip end portion of the drill body 11 on the margin 13 and intersect or contact the tip end side opening edges of the chip discharge grooves 12, 12. This is not done, and the intersecting ridge line L is the cutting edge 15 of the drill of this embodiment.
In other words, in the drill of this embodiment, the cross angle formed by the chisel 5 with respect to the cutting edge 4 is 180 ° when viewed from the tip of the conventional drill in the direction of the axis O.
And the cutting edge 4 are made to coincide with each other and reach the margin 6 on the outer circumference of the drill as it is.
【００１０】ここで、この切刃１５とされる交差稜線Ｌ
の両端は、上記マージン１３上において、このマージン
１３の周方向中央よりも僅かにドリル回転方向Ｔ側にお
いて該マージン１３に交差してドリル本体１１先端部外
周に達するようにされていて、これにより上記先端面１
４，１４のうち該マージン１３に交差する部分の長さ
は、上記交差稜線Ｌのドリル回転方向Ｔ側に位置する先
端面１４よりもドリル回転方向Ｔの後方側に位置する先
端面１４の方が長くなるようにされている。また、この
交差稜線Ｌのドリル回転方向Ｔ側に位置する先端面１４
の周方向の幅は、外周側に向かうに従い漸次小さくなる
ように形成されている。Here, the intersecting ridge line L to be the cutting edge 15
On both sides of the margin 13, the both ends of the margin 13 cross the margin 13 slightly on the drill rotation direction T side from the center of the margin 13 in the circumferential direction and reach the outer periphery of the tip of the drill body 11. The tip surface 1
The length of the portion of 4, 4 that intersects with the margin 13 is such that the tip surface 14 located on the rear side in the drill rotation direction T is longer than the tip surface 14 located on the drill rotation direction T side of the intersecting ridge line L. Is designed to be long. Further, the tip surface 14 located on the drill rotation direction T side of the intersecting ridge line L
The width in the circumferential direction is gradually reduced toward the outer peripheral side.
【００１１】さらに、本実施形態では、ドリル本体１１
が超硬合金等の硬質材料により形成されており、しかも
上記切屑排出溝１２，１２が形成されたその先端部の表
面全体は、ダイヤモンドコーティングやＤＬＣコーティ
ング等の硬質炭素皮膜、あるいはダイヤモンド砥粒を金
属メッキ相によって電着してなるダイヤモンド電着砥粒
層によって被覆されている。さらにまた、上記切屑排出
溝１２，１２によるこのドリル本体１１の先端部の心厚
ｄは、上記切刃１５の両端が軸線Ｏ回りになす円の直
径、すなわち切刃１５の外径Ｄに対して、０．５Ｄ未満
となるようにされている。Further, in this embodiment, the drill body 11
Is formed of a hard material such as a cemented carbide, and the entire surface of the tip end portion where the chip discharge grooves 12 and 12 are formed has a hard carbon film such as a diamond coating or a DLC coating, or diamond abrasive grains. It is coated with a diamond electrodeposition abrasive grain layer formed by electrodeposition with a metal plating phase. Furthermore, the core thickness d of the tip portion of the drill body 11 due to the chip discharge grooves 12, 12 is the diameter of a circle formed by the both ends of the cutting edge 15 around the axis O, that is, the outer diameter D of the cutting edge 15. Therefore, it is set to be less than 0.5D.
【００１２】このように構成されたドリルは、そのドリ
ル本体１１が上述のように軸線Ｏ回りに回転されつつ、
該軸線Ｏ方向先端側に例えば０．０２５〜０．１５μｍ
／ｒｅｖ度の極小さな送り量で送り出され、上記切刃１
５によって、シリコンや各種セラミックス、ガラス、あ
るいは炭化タングステン（ＷＣ）などの超硬合金材を含
む高硬度な脆性材料よりなる加工物に加工穴を形成す
る。なお、このときドリル本体１１はステップフィード
されるのが望ましく、また加工穴の穴明け部位には切削
油を供給するのが望ましい。In the drill constructed as described above, while the drill body 11 is rotated about the axis O as described above,
0.025 to 0.15 μm on the tip side in the direction of the axis O
The cutting edge 1 is delivered with an extremely small feed amount of / rev degree.
5, the machined hole is formed in the machined product made of high hardness brittle material including silicon, various ceramics, glass, or cemented carbide material such as tungsten carbide (WC). At this time, it is desirable that the drill body 11 be step-fed, and that cutting oil be supplied to the drilled portion of the processed hole.
【００１３】しかして、上記構成のドリルでは、上記先
端面１４，１４がその交差稜線Ｌからドリル本体１１の
外周に向けて後端側に向かうように傾斜させられるとと
もに、切刃１５となるこれら先端面１４，１４同士の上
記交差稜線Ｌが、切屑排出溝１２，１２の先端側開口縁
とは交差したりせずにドリル本体１１の外周に達するよ
うに延設されており、従ってこの切刃１５のドリル回転
方向Ｔ側は図２に示すように交差稜線Ｌの該ドリル回転
方向Ｔ側に連なる先端面１４によって面取りを施された
ようなホーニング面状に形成されることとなる。従っ
て、切屑排出溝１２がドリル本体１１の後端側に向かう
に従いドリル回転方向Ｔの後方側に捩れるように形成さ
れていても、切刃１５の刃先強度は十分に確保すること
ができ、上述のような高硬度の脆性材料に対しても切刃
１５にチッピングが生じるのを防いで円滑かつ安定した
穴明け加工を行うことが可能となる。In the drill having the above construction, however, the tip surfaces 14, 14 are inclined from the intersecting ridge line L toward the outer periphery of the drill body 11 toward the rear end side, and serve as the cutting edge 15. The above-mentioned intersecting ridge line L between the tip surfaces 14, 14 is extended so as to reach the outer periphery of the drill body 11 without intersecting with the tip-side opening edge of the chip discharge grooves 12, 12, and therefore, this cutting As shown in FIG. 2, the side of the blade 15 in the direction of drill rotation is formed into a honing surface which is chamfered by the tip end surface 14 which is continuous with the side of the intersecting ridge L in the direction of drill rotation T. Therefore, even if the chip discharge groove 12 is formed so as to be twisted rearward in the drill rotation direction T as it goes toward the rear end side of the drill body 11, the cutting edge strength of the cutting blade 15 can be sufficiently ensured. It is possible to prevent chipping of the cutting edge 15 and perform smooth and stable drilling even for a brittle material having high hardness as described above.
【００１４】その一方で、この切刃１５のドリル回転方
向Ｔ側に形成されるホーニング状面は、ドリル本体１１
の先端に先端面１４，１４を形成して切刃１５を研ぎ付
ける際に、該先端面１４，１４によって同時に形成され
るものであるから、従来のように切刃を形成したり再研
磨したりした後に別にホーニング工程を要することもな
く、当該ドリルの製造工程の簡略化を図ることができ
る。しかも、これらの先端面１４，１４は、ドリル本体
１１の基準となる軸線Ｏに対して所定の角度で傾斜して
交差する面として形成され、加えて本実施形態では平面
状でもあるので、これら先端面１４，１４を精度良く形
成することができ、従って上記ホーニング状面も高精度
で形成されることとなるので、上記構成のドリルにおい
ては上述のチッピング防止効果をより確実に奏功するこ
とも可能となる。On the other hand, the honing surface formed on the side of the cutting edge 15 in the direction of rotation T of the drill has a honing-like surface.
When the cutting edges 15 are sharpened by forming the tip surfaces 14 and 14 at the tips of the blades, they are formed simultaneously by the tip surfaces 14 and 14. It is possible to simplify the manufacturing process of the drill without requiring a separate honing process after the drilling. Moreover, these tip surfaces 14 and 14 are formed as surfaces that intersect the axis O, which is the reference of the drill body 11, at a predetermined angle and intersect, and in addition, in the present embodiment, they are also flat, so Since the tip surfaces 14 and 14 can be formed with high accuracy, and thus the honing surface is also formed with high accuracy, the chipping prevention effect described above can be more reliably achieved in the drill having the above configuration. It will be possible.
【００１５】さらに、本実施形態では、このように構成
されたドリル本体１１の先端部の表面に、ダイヤモンド
コーティングやＤＬＣコーティング等の硬質炭素皮膜、
あるいはダイヤモンド砥粒を金属メッキ相によって電着
してなるダイヤモンド電着砥粒層が被覆されている。こ
のため、上記脆性材料に穴明け加工を施す際には、上記
硬質炭素皮膜に成長したダイヤモンド粒子等の硬質炭素
粒子や上記ダイヤモンド電着砥粒層に保持されたダイヤ
モンド砥粒による極細かな凹凸によって当該脆性材料が
砥石による研削のように削り取られて細かな粉体状の切
粉として生成されることとなり、従って加工穴の開口部
にひび割れやコバ欠け等を生じることなく、かかる脆性
材料に確実に穴明け加工を行うことが可能となる。ま
た、このように硬質な炭素皮膜や電着砥粒層がドリル本
体１１表面に形成されることにより、切刃１５のチッピ
ング等をさらに確実に防止できるという効果も得られ
る。なお、これらのような効果を得るためには、上記硬
質炭素皮膜やダイヤモンド電着砥粒層は少なくとも切刃
１５の周辺部分に被覆されていればよい。Further, in the present embodiment, a hard carbon film such as a diamond coating or a DLC coating is formed on the surface of the tip of the drill body 11 thus constructed,
Alternatively, a diamond electrodeposition abrasive grain layer formed by electrodepositing diamond abrasive grains with a metal plating phase is coated. Therefore, when performing the drilling process on the brittle material, by the fine fine irregularities by the hard carbon particles such as diamond particles grown on the hard carbon film or the diamond abrasive grains held in the diamond electrodeposition abrasive grain layer The brittle material is scraped off like grinding with a grindstone and is generated as fine powdery chips, so that the brittle material can be reliably cut without cracking or edge chipping at the opening of the processed hole. It becomes possible to perform drilling processing. Further, by forming such a hard carbon film or electrodeposited abrasive grain layer on the surface of the drill body 11, it is possible to more reliably prevent chipping of the cutting edge 15 and the like. In order to obtain these effects, the hard carbon coating or the diamond electrodeposited abrasive grain layer may be coated at least on the peripheral portion of the cutting edge 15.
【００１６】さらにまた、本実施形態では、このように
脆性材料に穴明け加工を行うに際して粉体状に切粉が生
成されるのに対し、ドリル本体１１の先端部の心厚ｄを
切刃１５の外径Ｄに対して０．５Ｄ未満となるようにし
ており、従って切屑排出溝１２，１２の断面積は大きく
確保することができるので、上述のように生成される切
粉を円滑かつ速やかに排出するとともに切削液を確実に
切削部位に供給することができて、一層安定した穴明け
加工を行うことが可能となる。ただし、この心厚ｄが切
刃１５の外径Ｄに対してあまりに小さすぎると、ドリル
本体１１の剛性が劣化して損傷が生じるおそれがあるの
で、心厚ｄは切刃１５の外径Ｄに対して０．２Ｄ〜０．
５Ｄの範囲とされるのが望ましい。Furthermore, in the present embodiment, when the brittle material is punched as described above, powdery chips are produced, whereas the core thickness d at the tip of the drill body 11 is set to the cutting edge. The outer diameter D of 15 is less than 0.5D. Therefore, the cross-sectional area of the chip discharge grooves 12, 12 can be secured to be large, so that the chips produced as described above can be smoothly and smoothly produced. Since the cutting fluid can be discharged quickly and the cutting fluid can be surely supplied to the cutting portion, more stable drilling can be performed. However, if the core thickness d is too small with respect to the outer diameter D of the cutting edge 15, the rigidity of the drill body 11 may deteriorate and damage may occur. For 0.2D to 0.
A range of 5D is desirable.
【００１７】一方、本実施形態では、上記先端面１４，
１４が平面状に形成されていて、これに伴い切刃１５と
されるその交差稜線Ｌは軸線Ｏに直交する直線状とされ
ており、従って切刃１５の全長が１度に加工物に食い付
くこととなるので、特に上記脆性材料に穴明けを行う場
合に食い付き時の負荷が１点に集中するのを防いでひび
割れやコバ欠け等をより確実に防止することができると
いう効果を得ている。ただし、このような場合には、逆
にドリル本体１１の求心性が損なわれて加工穴の直進度
等の劣化を招くおそれがあるため、このような求心性を
確保する場合には、例えば先端面１４，１４を軸線Ｏに
斜交する交差する中心線を有する円錐面状に形成するな
どして、図４に示す本発明の第２の実施形態のように切
刃１５を軸線Ｏ上において凸Ｖ字状に曲折する折れ線状
とし、所定の先端角が与えられるように形成してもよ
い。また、このような求心性の確保と食い付き時の負荷
の集中防止とを両立させる場合には、例えば先端面１
４，１４を軸線Ｏから偏心した位置に中心を有する球面
状に形成するなどして、図５に示す本発明の第３の実施
形態のように切刃１５を軸線Ｏ上に突端を有する凸曲線
状に形成してもよい。なお、これら第２、第３の実施形
態においても、先端面１４，１４が軸線Ｏに対して対称
に形成されていれば、該軸線Ｏ方向先端視の形状は図１
に示したものと同じとなる。On the other hand, in the present embodiment, the tip surface 14,
14 is formed in a plane shape, and the intersecting ridge line L that is the cutting edge 15 is linearly formed orthogonal to the axis O, so that the entire length of the cutting edge 15 bites the workpiece at one time. Therefore, it is possible to prevent the load at the time of biting from concentrating on one point especially when drilling holes in the brittle material, and to more reliably prevent cracks and edge defects. ing. However, in such a case, concentricity of the drill body 11 may be impaired and the straightness of the machined hole may be deteriorated. By forming the surfaces 14 and 14 into a conical surface having intersecting center lines obliquely intersecting with the axis O, the cutting edge 15 is placed on the axis O as in the second embodiment of the present invention shown in FIG. It may be formed in a bent line shape bent into a convex V shape so that a predetermined tip angle is given. Further, in the case of achieving both such centripetality and the prevention of the concentration of the load at the time of biting, for example, the tip surface 1
4, 4 and 14 are formed in a spherical shape having a center at a position eccentric from the axis O so that the cutting edge 15 has a projection with a projection on the axis O as in the third embodiment of the present invention shown in FIG. It may be formed in a curved shape. In addition, also in these second and third embodiments, if the tip surfaces 14 and 14 are formed symmetrically with respect to the axis O, the shape of the tip in the direction of the axis O is as shown in FIG.
It is the same as that shown in.
【００１８】さらに、上記実施形態では、ドリル本体１
１の先端部外周に２条の切屑排出溝１２，１２が形成さ
れるとともに、先端面１４，１４も２つずつ形成されて
おり、これらの先端面１４，１４の交差稜線Ｌが切刃１
５とされているが、切屑排出溝１２や先端面１４の数は
３以上であってもよく、また互いに異なる数であっても
よい。さらにまた、上記切刃１５も、すべての先端面同
士の交差稜線に形成されていなくてもよく、すなわちこ
の交差稜線部のうち切屑排出溝１２の先端側開口縁に交
差したりすることなくドリル本体１１外周に達する交差
稜線が切刃１５とされていればよい。Further, in the above embodiment, the drill body 1
Two chip discharge grooves 12 and 12 are formed on the outer periphery of the tip end portion of 1, and two tip end surfaces 14 and 14 are also formed, and the intersecting ridge line L of these tip end surfaces 14 and 14 is the cutting edge 1.
Although the number is 5, the number of the chip discharge grooves 12 and the tip surfaces 14 may be three or more, or may be different from each other. Furthermore, the cutting edge 15 does not have to be formed on the ridgeline of intersection between all the tip surfaces, that is, the drill without intersecting the tip side opening edge of the chip discharge groove 12 in this ridgeline portion. The intersecting ridgeline that reaches the outer periphery of the main body 11 may be the cutting edge 15.
【００１９】[0019]
【発明の効果】以上説明したように、本発明によれば、
ドリル本体の先端に２つ以上の先端面を、その交差稜線
が切屑排出溝の先端側開口縁に交差することなくドリル
本体外周に達するように形成して、この交差稜線を切刃
とすることにより、ホーニング工程を要することなく切
刃のドリル回転方向側にホーニング状面を精度良く形成
して刃先強度を確保することが可能となり、特に脆性材
料に穴明け加工を行う場合でも切刃にチッピング等が生
じるのを防いでドリル寿命の延長を図り、円滑かつ安定
した穴明けを行うことが可能となる。As described above, according to the present invention,
Forming two or more tip surfaces at the tip of the drill body so that the intersecting ridge lines reach the outer periphery of the drill body without intersecting the tip-side opening edge of the chip discharge groove, and use these intersecting ridge lines as cutting edges. As a result, it is possible to accurately form a honing surface on the side of the cutting blade in the direction of rotation of the drill without requiring a honing process, and to secure the strength of the cutting edge. It is possible to prevent the occurrence of such problems and prolong the life of the drill, and perform smooth and stable drilling.
【図１】 本発明の第１の実施形態を示す、軸線Ｏ方向
先端視の正面図である。FIG. 1 is a front view of the first embodiment of the present invention as viewed from the front end in the direction of an axis O. FIG.
【図２】 図１における矢線Ａ方向視の側面図である。FIG. 2 is a side view taken along arrow A in FIG.
【図３】 図１における矢線Ｂ方向視の側面図である。FIG. 3 is a side view taken along arrow B in FIG.
【図４】 本発明の第２の実施形態を示す、図１におけ
る矢線Ｂ方向視の側面図に相当する図である。FIG. 4 is a view showing a second embodiment of the present invention and corresponds to a side view as viewed in the direction of arrow B in FIG. 1.
【図５】 本発明の第３の実施形態を示す、図１におけ
る矢線Ｂ方向視の側面図に相当する図である。FIG. 5 is a view showing a third embodiment of the present invention and corresponding to a side view taken along the arrow B in FIG.
【図６】 従来のドリルの軸線Ｏ方向先端視の正面図で
ある。FIG. 6 is a front view of a conventional drill as viewed from the front end in the direction of the axis O.
【図７】 図６における矢線Ａ方向視の側面図である。FIG. 7 is a side view taken along the arrow A in FIG.
【図８】 他の従来のドリルの軸線Ｏ方向先端視の正面
図である。FIG. 8 is a front view of another conventional drill as viewed from the front end in the direction of the axis O.
【図９】 図８における矢線Ａ方向視の側面図である。9 is a side view taken along the arrow A in FIG.
１１ ドリル本体 １２ 切屑排出溝 １３ マージン １４ 先端面 １５ 切刃 Ｏ ドリル本体１１の軸線 Ｔ ドリル回転方向 Ｌ 先端面１４，１４の交差稜線 Ｄ 切刃１５の外径 ｄ ドリル本体１１の心厚 11 drill body 12 Chip discharge groove 13 Margin 14 Tip surface 15 cutting edge O Axis of drill body 11 T drill rotation direction L Tip surface 14, 14, intersecting ridge line D Cutting edge 15 outer diameter d Core thickness of the drill body 11
───────────────────────────────────────────────────── フロントページの続き (72)発明者 池内 寛 兵庫県明石市魚住町金ヶ崎西大池179番地 １ エムエムシーコベルコツール株式会社 内 Ｆターム(参考） 3C037 BB00 CC01 DD01 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hiroshi Ikeuchi No.179 Kanegasaki Nishioike, Uozumi Town, Akashi City, Hyogo Prefecture 1 MC Kobelco Tool Co., Ltd. Within F term (reference) 3C037 BB00 CC01 DD01
Claims (4)
本体の先端部外周に、該ドリル本体の先端に開口する複
数条の切屑排出溝が形成されるとともに、このドリル本
体の先端には、上記軸線に対して傾斜して交差し、かつ
互いの交差稜線が上記切屑排出溝の先端側開口縁に交差
することなく上記ドリル本体の外周に達する複数の先端
面が形成されていて、これらの先端面の上記交差稜線が
切刃とされていることを特徴とするドリル。1. A plurality of chips discharge grooves that open to the tip of the drill body are formed on the outer periphery of the tip of the substantially cylindrical drill body that rotates about an axis, and the tip of the drill body has a tip. , A plurality of tip surfaces that reach the outer circumference of the drill body without intersecting the tip edge side opening edge of the chip discharge groove with the intersecting ridge lines inclined with respect to the axis line, A drill characterized in that the above-mentioned intersecting ridgeline on the tip surface of is a cutting edge.
物に加工穴を形成することを特徴とする請求項１に記載
のドリル。2. The drill according to claim 1, wherein the cutting edge forms a drilled hole in a workpiece made of a brittle material.
分には、硬質炭素皮膜またはダイヤモンド電着砥粒層が
被覆されていることを特徴とする請求項１または請求項
２に記載のドリル。3. The drill according to claim 1, wherein at least the cutting edge portion of the tip of the drill body is coated with a hard carbon coating or a diamond electrodeposition abrasive grain layer.
径Ｄに対して０．５Ｄ未満とされていることを特徴とす
る請求項１ないし請求項３のいずれかに記載のドリル。4. The drill according to claim 1, wherein the core thickness of the drill body is less than 0.5D with respect to the outer diameter D of the cutting edge. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001317195A JP3657546B2 (en) | 2001-10-15 | 2001-10-15 | drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001317195A JP3657546B2 (en) | 2001-10-15 | 2001-10-15 | drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003117708A true JP2003117708A (en) | 2003-04-23 |
| JP3657546B2 JP3657546B2 (en) | 2005-06-08 |
Family
ID=19135104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001317195A Expired - Lifetime JP3657546B2 (en) | 2001-10-15 | 2001-10-15 | drill |
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| Country | Link |
|---|---|
| JP (1) | JP3657546B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009172518A (en) * | 2008-01-24 | 2009-08-06 | Ngk Insulators Ltd | Manufacturing method of perforated honeycomb structure body |
| US20140193220A1 (en) * | 2012-04-11 | 2014-07-10 | Sumitomo Electric Hardmetal Corp. | Bit exchangeable drill |
| US10357832B2 (en) | 2014-10-24 | 2019-07-23 | Kyocera Corporation | Drill and method for manufacturing machined product using same |
-
2001
- 2001-10-15 JP JP2001317195A patent/JP3657546B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009172518A (en) * | 2008-01-24 | 2009-08-06 | Ngk Insulators Ltd | Manufacturing method of perforated honeycomb structure body |
| US20140193220A1 (en) * | 2012-04-11 | 2014-07-10 | Sumitomo Electric Hardmetal Corp. | Bit exchangeable drill |
| EP2837454A4 (en) * | 2012-04-11 | 2015-12-16 | Sumitomo Elec Hardmetal Corp | Replaceable tool-edge drill |
| US9370829B2 (en) * | 2012-04-11 | 2016-06-21 | Sumitomo Electric Hardmetal Corp. | Bit exchangeable drill |
| US10357832B2 (en) | 2014-10-24 | 2019-07-23 | Kyocera Corporation | Drill and method for manufacturing machined product using same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3657546B2 (en) | 2005-06-08 |
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