JP2562513B2 - Gun drill - Google Patents
Gun drillInfo
- Publication number
- JP2562513B2 JP2562513B2 JP2226742A JP22674290A JP2562513B2 JP 2562513 B2 JP2562513 B2 JP 2562513B2 JP 2226742 A JP2226742 A JP 2226742A JP 22674290 A JP22674290 A JP 22674290A JP 2562513 B2 JP2562513 B2 JP 2562513B2
- Authority
- JP
- Japan
- Prior art keywords
- drill
- diameter
- drill blade
- shank
- shank portion
- 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.)
- Expired - Fee Related
Links
Landscapes
- Drilling Tools (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、内部に適宜の間隔をおいて断続的に続く複
数の空隙部が存在する被加工物において、その空隙部を
通過するドリル先端が空隙部壁の正確な位置に穴開けす
ることができるガンドリルに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a work piece having a plurality of voids which are intermittently continued at appropriate intervals inside thereof, and a drill tip passing through the voids. Relates to a gun drill capable of making a hole at an accurate position of a cavity wall.
従来より被加工物に穴開け加工をする際に、特に深い
穴の場合にはカンドリルが使用されている。しかし、該
ガンドリルは被加工物が完全な肉部のみの場合には深い
穴開けを正確にすることができるものであるが、その被
加工物の内部に空隙部が存在し、その空隙部を通過して
穴開けをする場合には、ガンドリルのドリル刃先が空隙
部に達したときに、先端がふらつくものであり、空隙部
から再び肉部に突入するときに、その先端部のふらつき
によって正確な位置からΔＬずれた箇所に穴開けするこ
とがある（第14図参照）。Conventionally, when drilling a workpiece, a candrill has been used especially for deep holes. However, the gun drill can accurately perform deep drilling when the work piece has only a complete meat portion, but there is a void portion inside the work piece, and the void portion is When drilling through the holes, the tip fluctuates when the gun blade edge of the gun drill reaches the void, and when the hole again enters the meat part, the fluctuation of the tip causes A hole may be drilled at a position deviating from the above position by ΔL (see Fig. 14).
しかも、従来のガンドリルにおけるシャンク部ａは、
第13図に示すように、ドリル刃部より一段と細い直径で
あり、且つ長手方向に切削屑排出溝を設けて、その断面
形状が略Ｖ字状の切欠き部を有する中空鋼管からなって
いるので、既にドリル刃部先にて穿孔された穴の直径に
対して、シャンク部ａの直径が細いのでシャンク部ａは
穴の中で何ら支持されるものがなく、またドリル刃部よ
り長尺であるシャンク部ａは断面形状が略Ｖ字状となっ
ているので、回転バランスが均等でない。Moreover, the shank part a in the conventional gun drill is
As shown in FIG. 13, it is made of a hollow steel pipe having a diameter much smaller than that of the drill blade portion, provided with a cutting waste discharge groove in the longitudinal direction, and having a notch portion having a substantially V-shaped cross section. Therefore, since the diameter of the shank portion a is smaller than the diameter of the hole already drilled at the tip of the drill blade, the shank portion a is not supported in the hole and is longer than the drill blade. Since the shank portion "a" has a substantially V-shaped cross section, the rotational balance is not uniform.
それゆえに、シャンク部ａに振動が生じることになり
（これを縄跳び現象という。第13図参照）、その振動が
ドリル刃先に伝わる。Therefore, vibration is generated in the shank portion a (this is called a jump rope phenomenon, see FIG. 13), and the vibration is transmitted to the drill cutting edge.
これが工作精度に、悪影響を与え、例えば被加工物の
空隙部分にドリル刃先が達したときに、ドリル先端がフ
リーとなるためドリル刃先が軸線に対して僅かに傾いて
しまい、正確な位置への穴開け加工が困難となる不都合
が存在していた（第14図参照）。また、新たな穴開時に
は、負荷状態での先端回転にてズレが生ずることもあ
り、正確な穴開け加工ができないこともあった。This adversely affects the machining accuracy, for example, when the drill tip reaches the void of the work piece, the tip of the drill becomes free and the drill tip slightly tilts with respect to the axis. There was the inconvenience that it became difficult to make holes (see Fig. 14). In addition, when a new hole is opened, there is a possibility that the tip rotation under load causes a deviation, which makes it impossible to perform accurate hole forming.
そこで発明者は、前記課題を解決すべく、鋭意，研究
を重ねた結果、その発明を、ドリル刃部から、該ドリル
刃部の直径よりも小径の首部を介して断面円形状のシャ
ンク部を設け、該シャンク部の直径がドリル刃部の直径
を越えないで、略同等とし、前記首部を介して前記ドリ
ル刃部に設けた切欠き溝とシャンク部に設けた複数の溝
条とを連通状態としたガンドリルとしたり、或いは、ド
リル刃部から首部を介して断面円形状のシャンク部を設
け、該シャンク部の直径がドリル刃部の直径を越えない
で、略同等とし、該ドリル刃部から、該ドリル刃部の直
径よりも小径の首部にかけて長手方向に断面略Ｖ字状の
切欠き溝を設け、前記シャンク部の外周に複数の螺旋状
の溝条を設け、前記首部を介して前記切欠き溝と前記溝
条とを連通状態としたガンドリルとしたことにより、内
部に適宜の間隔をおいて断続的に続く複数の空隙部が存
在する被加工物において、その空隙部を通過するドリル
先端が空隙部壁の正確な位置に穴開加工でき、前記課題
を解決したものである。Therefore, the inventor, as a result of earnestly researching in order to solve the above problems, has found that the invention provides a shank portion having a circular cross section through a drill blade portion and a neck portion having a diameter smaller than the diameter of the drill blade portion. The diameter of the shank portion does not exceed the diameter of the drill blade portion and is substantially equal to each other, and the notch groove provided in the drill blade portion and the plurality of grooves provided in the shank portion are communicated through the neck portion. Or a shank portion having a circular cross-section is provided from the drill blade portion through the neck portion so that the diameter of the shank portion does not exceed the diameter of the drill blade portion, and is made substantially the same. To the neck portion having a diameter smaller than the diameter of the drill blade portion, a notch groove having a substantially V-shaped cross section is provided in the longitudinal direction, and a plurality of spiral groove grooves are provided on the outer periphery of the shank portion. The cutout groove and the groove are in communication with each other. By using a gun drill, in a workpiece that has multiple voids that are intermittently continuous at appropriate intervals inside, the drill tip that passes through the voids is drilled at the correct position on the void wall. It is possible to solve the above problems.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図に示すものが、本発明のガンドリルＡであり、
その全体が示されており、その構成はドリル刃部１及び
シャンク部２より形成され、またドリル刃部１とシャン
ク部２とは、前記ドリル刃部１の直径よりも小径の首部
３にて連結されている。さらに、そのシャンク部２には
ドライバー部４が形成され、工作機械のチャック部に連
結される。FIG. 1 shows the gun drill A of the present invention,
The whole is shown, and the structure is formed by a drill blade portion 1 and a shank portion 2, and the drill blade portion 1 and the shank portion 2 are formed by a neck portion 3 having a diameter smaller than that of the drill blade portion 1. It is connected. Further, a driver portion 4 is formed on the shank portion 2 and is connected to the chuck portion of the machine tool.
ドリル刃部１の断面は、第４図に示すように断面Ｖ字
状の切欠き溝1aが形成されており、そのドリル刃部１が
工作時に回転することによってできる仮想円の直径（即
ち、ドリル刃部１の回転直径であり、且つ被加工物Ｂに
形成される加工穴の直径でもある）は、第２図に示すよ
うにD1である。また、その長さの短い首部３にも断面Ｖ
字状の切欠き溝1aが形成されている。従って、該切欠き
溝1aは、ドリル刃部１から首部３にかけて長手方向に連
続している。As shown in FIG. 4, the cross section of the drill blade 1 is formed with a notch groove 1a having a V-shaped cross section, and the diameter of an imaginary circle (that is, The rotation diameter of the drill blade portion 1 and also the diameter of the processing hole formed in the workpiece B) are D 1 as shown in FIG. In addition, the neck 3 having a short length has a cross section V.
A V-shaped cutout groove 1a is formed. Therefore, the cutout groove 1a is continuous in the longitudinal direction from the drill blade portion 1 to the neck portion 3.
上記ドリル刃部１は、高速度鋼，超硬合金等の工具材
料にて形成されており、またシャンク部２もドリル刃部
１と同等の工具材料にて形成されている。The drill blade portion 1 is made of a tool material such as high speed steel or cemented carbide, and the shank portion 2 is also made of a tool material equivalent to the drill blade portion 1.
そのシャンク部２は、前述したようにドリル刃部１に
首部３を介して連続形成されたものであって、その断面
は円形状であり、且つその直径D2は、前記ドリル刃部１
の仮想円直径D1に略等しい（第２図参照）。The shank portion 2 is formed continuously with the drill blade portion 1 via the neck portion 3 as described above, and has a circular cross section, and the diameter D 2 thereof is the same as that of the drill blade portion 1 described above.
Is substantially equal to the imaginary circle diameter D 1 of (see FIG. 2).
上述の「ドリル刃部１の仮想円直径D1に略等しい」と
は、シャンク部２の直径がドリル刃部１の仮想円直径に
等しく、D1とD2とが完全に等しい場合も含まれるもので
ある。さらに、シャンク部２の直径D2は、ドリル刃部１
の直径D1を越えない寸法となっており、ドリル刃部１に
て後述する被加工物Ｂに穴開けをしているときに、シャ
ンク部２がドリル刃部１にて形成された被加工穴内を滑
らかに進行することができるものである。The above-mentioned "substantially equal to the virtual circle diameter D 1 of the drill blade portion 1" includes the case where the diameter of the shank portion 2 is equal to the virtual circle diameter of the drill blade portion 1 and D 1 and D 2 are completely equal. It is what is done. Furthermore, the diameter D 2 of the shank portion 2 is
Has a dimension of not more than a diameter D 1, the workpiece that when you are a drilled hole in the workpiece B which will be described later in conjunction with the drill bit 1, the shank portion 2 is formed at the drill bit 1 It can smoothly move in the hole.
実際には、シャンク部２の直径D2は、ドリル刃部１の
仮想円直径D1より僅かに小さく形成されていることが好
ましく、D2＝D1−Δｄとなり、そのΔｄは極めて小さい
数値、例えば数μ〜数十μである。In practice, the diameter D 2 of the shank portion 2 is preferably formed to be slightly smaller than the virtual circle diameter D 1 of the drill blade portion 1, and D 2 = D 1 −Δd, which Δd is an extremely small numerical value. , For example, several μ to several tens of μ.
シャンク部２の周囲には、第１図乃至第３図に示すよ
うに螺旋状に溝条５が形成され、ドリル刃部１が穴開け
作業をしている最中に生じた切削屑（首部３で排出でき
なかった切削屑）を被加工物Ｂ外部に排出する役目をな
している。また、ガンドリルＡの内部より送り出された
切削油を被加工物Ｂとシャンク部２との間に流動させ、
カジリ防止を行っている。Grooves 5 are spirally formed around the shank portion 2 as shown in FIGS. 1 to 3, and cutting scraps (neck portion) generated during the drilling operation of the drill blade portion 1 are performed. The cutting waste which could not be discharged in 3) is discharged to the outside of the workpiece B. Further, the cutting oil sent from the inside of the gun drill A is caused to flow between the workpiece B and the shank portion 2,
Prevents galling.
溝条５はシャンク部２の周囲に複数形成されることが
好ましく、図面の実施例では４本形成され、４条タイプ
の螺子状に形成されている（第５図参照）。It is preferable that a plurality of grooves 5 are formed around the shank portion 2. In the embodiment shown in the drawings, four grooves are formed, and four grooves are formed in a screw shape (see FIG. 5).
ガンドリルＡの内部には、その長手方向の全長に亘っ
て切削油流通路６が貫通されている。該切削油流通路６
において、そのドリル刃部１の先端側を流通路出口部6
a、ガンドリルＡのドライバー部４側の入口を流通路入
口部6bとして形成されている。穴開け時において流通路
入口部6bより切削油が注入され、流通路出口部6aより切
削油が放出され、良好な切削と切削時の熱の発生を防止
する構造となっている。The cutting oil flow passage 6 penetrates through the gun drill A over the entire length in the longitudinal direction. The cutting oil flow passage 6
At the tip of the drill blade 1, the flow passage outlet 6
The inlet on the driver part 4 side of the gun drill A is formed as a flow passage inlet part 6b. Cutting oil is injected from the flow passage inlet portion 6b at the time of drilling, and cutting oil is discharged from the flow passage outlet portion 6a to prevent good cutting and heat generation during cutting.
被加工物Ｂは、エンジンのケーシング等で具体的に
は、鋳造品等であり、図の実施例ではその内部に肉部７
と空隙部８とが交互に連続しており、その空隙部８は第
６図，第７図に示す実施例では小容積となっているが、
大容積の場合もある。The workpiece B is, for example, a cast product such as a casing of an engine, and in the embodiment shown in the drawing, the meat portion 7 is provided therein.
And voids 8 are alternately continuous, and the voids 8 have a small volume in the embodiment shown in FIGS. 6 and 7,
It may have a large volume.
Ｃは工作機械であって、第６図に示すように基台９上
に駆動部10及びベッド11が配置され、さらに、駆動部10
はガイド12上を前後方向に移動する構造となっている。
また、ベッド11にはガンドリルＡの支持台13が配置され
ている。C is a machine tool, which has a drive unit 10 and a bed 11 arranged on a base 9 as shown in FIG.
Has a structure that moves on the guide 12 in the front-rear direction.
A support base 13 for the gun drill A is arranged on the bed 11.
駆動部10にはチャック10aがガンドリルＡのドライバ
ー部４を固定し、原動機10bにて回転する。支持台13は
ガンドリルＡの駆動部10との支持固定側の反対側をガン
ドリルＡが回転可能に支持するものである。The chuck 10a fixes the driver unit 4 of the gun drill A to the drive unit 10 and rotates it by the prime mover 10b. The support base 13 rotatably supports the gun drill A on the side opposite to the supporting and fixing side of the drive unit 10 of the gun drill A.
本発明のガンドリルＡは、工作機械の駆動部10のチャ
ック10aに支持固定され、そのドリル刃部１はベッド11
上の支持台13に回転自在に支持される。また、被加工物
Ｂはベッド11上に支持固定され、ガンドリルＡのドリル
刃部１が穴加工位置に正確に配置される。The gun drill A of the present invention is supported and fixed to a chuck 10a of a drive unit 10 of a machine tool, and the drill blade portion 1 thereof has a bed 11a.
It is rotatably supported by an upper support base 13. Further, the workpiece B is supported and fixed on the bed 11, and the drill blade portion 1 of the gun drill A is accurately arranged at the hole drilling position.
駆動部10の原動機10bが始動し、ガンドリルＡが回転
すると、被加工物Ｂに穴開け加工が行われる。先ず第６
図に示すようにドリル刃部１が被加工物Ｂの肉部７に穴
開けを行い、第７図に示すようにドリル刃部１に追従し
てシャンク部２がドリル刃部１にて形成された穴に入っ
て行く。その穴に入ったシャンク部２はドリル刃部１に
て形成された加工穴の直径に略等しく、該加工穴がシャ
ンク部２の移動時のガイドになる。When the prime mover 10b of the drive unit 10 is started and the gun drill A is rotated, the workpiece B is perforated. First 6th
As shown in the figure, the drill blade portion 1 makes a hole in the meat portion 7 of the workpiece B, and the shank portion 2 is formed by the drill blade portion 1 following the drill blade portion 1 as shown in FIG. Go into the designated hole. The shank portion 2 that has entered the hole is approximately equal to the diameter of the processed hole formed by the drill blade portion 1, and the processed hole serves as a guide when the shank portion 2 moves.
請求項１の発明においては、ドリル刃部１から、該ド
リル刃部１の直径よりも小径の首部３を介して断面円形
状のシャンク部２を設け、該シャンク部２の直径がドリ
ル刃部１の直径を越えないで、略同等とし、前記首部３
を介して前記ドリル刃部１に設けた切欠き溝1aとシャン
ク部２に設けた複数の溝条５とを連通状態としたガンド
リルとしたことにより、先ず第１に内部に断続的に空隙
部８が存在する被加工物Ｂにおいて、その複数の空隙部
8,8,…を貫通する穴開け作業を正確に行うことがきる
し、第２に穴開け作業が正確かつ安定するし、第３にシ
ャンク部２の強度を向上させることができる等の種々の
効果を奏する。In the invention of claim 1, the shank portion 2 having a circular cross section is provided from the drill blade portion 1 through the neck portion 3 having a diameter smaller than the diameter of the drill blade portion 1, and the diameter of the shank portion 2 is the drill blade portion. The diameter of the neck portion 3 is substantially the same without exceeding the diameter of 1.
First, the gun drill is configured such that the cutout groove 1a provided in the drill blade portion 1 and the plurality of groove lines 5 provided in the shank portion 2 are in communication with each other through In the workpiece B in which 8 exists, the plurality of voids
It is possible to perform the drilling work that penetrates 8,8, ... Accurately, secondly, the drilling work is accurate and stable, and thirdly, the strength of the shank portion 2 can be improved. Produce the effect of.
これらの効果について詳述すると、シャンク部２の直
径D2をドリル刃部１の直径D1と略等しくしたので、ドリ
ル刃部１が被加工物Ｂに穴開け加工を開始すると、シャ
ンク部２は、ドリル刃部１に追従して、穴開け部分にシ
ャンク部２が入ってゆくが、このときシャンク部２の周
囲は穴開け箇所に支持されてドリル刃部１を極めて安定
した状態にすることができる。To describe these effects in detail, since the diameter D 2 of the shank portion 2 is made substantially equal to the diameter D 1 of the drill blade portion 1, when the drill blade portion 1 starts drilling the workpiece B, the shank portion 2 Follows the drill blade portion 1 and the shank portion 2 enters the drilled portion. At this time, the periphery of the shank portion 2 is supported by the drilled portion and makes the drill blade portion 1 extremely stable. be able to.
即ち、穴開け部分の直径とシャンク部２の直径D2とは
略同等であるか、或いは僅かにシャンク部２の直径D2が
小さいために穴開け部分はシャンク部２の軸受作用の役
目をなすものであるため、従来のようにシャンク部ａ
（第14図参照）の直径が極めて小さく、断面形状がドリ
ル刃部の略Ｖ字状切欠きと連なって形成され、円周方向
のバランスが均等でなく、それゆえに被加工穴内で回転
と同時にシャンク部ａの長手方向に円弧状の振動を起こ
して、いわゆる縄跳び現象によってシャンク部ａがドリ
ル刃部に悪影響を及ぼすような不都合があったが、本発
明にてこれを解決することができる。これは、被加工穴
においてシャンク部２の中心O2と被加工穴の中心とが一
致（又は略一致）しており（第８図，第９図参照）、さ
らにドリル刃部１の中心O1と被加工穴の中心とも一致し
ていることで（第10図参照）、被加工穴内でのガンドリ
ルＡは、そのシャンク部２の回転バランスが良好となり
大きく振動することがなく、それゆえにドリル刃部１へ
の振動の伝播することを防止することができ、正確な穴
開け作業をおこなうことができるものである（第11図参
照）。That is, it is substantially equal to the diameter D 2 of the drilling diameter portion and the shank portion 2, or the piercing portion to the diameter D 2 of slightly shank portion 2 is small serves as a bearing action of the shank portion 2 Since it is an eggplant, the shank part a
(See Fig. 14) The diameter is extremely small, and the cross-sectional shape is continuous with the V-shaped notch in the drill blade, and the circumferential balance is not uniform. There is a disadvantage that the shank portion a adversely affects the drill blade portion due to a so-called jump rope phenomenon by causing an arcuate vibration in the longitudinal direction of the shank portion a, which can be solved by the present invention. This is because the center O 2 of the shank portion 2 and the center of the hole to be processed coincide (or substantially coincide) with each other in the hole to be processed (see FIGS. 8 and 9), and further, the center O of the drill blade part 1 Since 1 matches the center of the hole to be machined (see Fig. 10), the gun drill A in the hole to be machined has a good rotational balance of its shank portion 2 and does not vibrate significantly, and therefore the drill It is possible to prevent the vibration from propagating to the blade portion 1 and perform an accurate drilling operation (see FIG. 11).
特に、被加工物Ｂ内に空隙が存在するものにおいて、
従来のガンドリルでは、そのドリル刃部が空隙部内に達
したときには、該ドリル刃部が何ら支持されていない状
態になるためドリル刃部先端の振動によるふらつきが最
も顕著に発生するところであった。このような不都合な
点において本発明のガンドリルＡではシャンク部２がド
リル刃部１と同等の直径としてあるため、前述したよう
にドリル刃部１の被加工穴がシャンク部２を密接状に支
持し、その被加工穴がまさに軸受としての役目をなし、
ドリル刃部１のふらつきを防止することができる。In particular, in the case where the work B has voids,
In the conventional gun drill, when the drill blade portion reaches the inside of the void portion, the drill blade portion is not supported at all, so that the wobbling due to the vibration of the tip of the drill blade portion is most remarkable. In such a disadvantage, since the shank portion 2 has the same diameter as the drill blade portion 1 in the gun drill A of the present invention, the processed hole of the drill blade portion 1 closely supports the shank portion 2 as described above. However, the hole to be processed serves as a bearing exactly,
It is possible to prevent the drill blade portion 1 from wobbling.
また、内部に断続的に空隙部８が存在する被加工物Ｂ
において、請求項１の発明のガンドリルを使用すると、
ドリル刃部１によって発生した切削屑を、ドリル刃部１
の切欠き溝1aの首部３箇所から外部としての空隙部８に
効果的に排出することができ、シャンク部２に伝わる切
削屑を極力少なくできる。これによって、カジリ防止等
を良好にできる。Further, the workpiece B having the voids 8 intermittently present inside
In the use of the gun drill according to claim 1,
The cutting waste generated by the drill blade 1
It is possible to effectively discharge from the three neck portions of the notch groove 1a to the void portion 8 as the outside, and the cutting scraps transmitted to the shank portion 2 can be minimized. This makes it possible to effectively prevent galling.
また、請求項１の発明では、ガンドリルの内部より送
り出された切削油が首部３箇所で貯留状態となって、シ
ャンク部２の複数の溝条５に均一に流動させることがで
き、これによって、良好なる軸受状態にできる。Further, in the invention of claim 1, the cutting oil sent from the inside of the gun drill is stored at the three neck portions and can be made to flow evenly to the plurality of grooves 5 of the shank portion 2. A good bearing condition can be achieved.
このように、シャンク部２に切削油が均一的に流れる
ので、軸受作用が良好となり、被加工物とシャンク部２
とのカジリ防止ができ、ドリル刃部１を安定して支持で
きる効果がある。これがため、ドリル刃部１における穴
開けを正確かつ安定させることができる。In this way, since the cutting oil flows evenly through the shank portion 2, the bearing action becomes good, and the workpiece and the shank portion 2
It is possible to prevent galling and to stably support the drill blade portion 1. Therefore, the drilling of the drill blade 1 can be accurately and stably performed.
以上のように、首部３の存在と、切欠き溝1aとシャン
ク部２の複数の溝条５とを連通状態としたことで、内部
に断続的に空隙部８が存在する被加工物Ｂに穴開け加工
すると、切削油が流れる箇所のシャンク部２を油注入型
の軸受にでき、しかも、切削屑は首部３箇所にて排出さ
せることもできる。As described above, the presence of the neck portion 3 and the cutout groove 1a and the plurality of groove lines 5 of the shank portion 2 are in communication with each other, so that the workpiece B in which the void portions 8 are intermittently present inside is formed. When the boring process is performed, the shank portion 2 where the cutting oil flows can be an oil-injection type bearing, and the cutting waste can be discharged at the three neck portions.
さらに、シャンク部２は、ドリル刃部１と同等又は略
同等の直径を有しているので力学的強度も向上してい
る。Further, since the shank portion 2 has a diameter equal to or substantially equal to that of the drill blade portion 1, the mechanical strength is also improved.
次に、請求項２の発明においては、ドリル刃部１か
ら、該ドリル刃部１の直径よりも小径の首部３を介して
断面円形状のシャンク部２を設け、該シャンク部２の直
径がドリル刃部１の直径を越えないで、略同等とし、該
ドリル刃部１から首部３にかけて長手方向に断面略Ｖ字
状の切欠き溝1aを設け、前記シャンク部２の外周に複数
の螺旋状の溝条５を設け、前記首部３を介して前記切欠
き溝1aと前記溝条５とを連通状態としたガンドリルとし
たことにより、切欠き溝1aは、ドリル刃部１から首部３
にかけて長手方向に断面略Ｖ字状をなし、且つ複数の溝
条５は螺旋状をなしているため、ガンドリルＡの内部よ
り送り出された切削油を、シャンク部２の外周に均一的
でしかもスムーズに流動させることができ、特に、シャ
ンク部２箇所のカジリ防止ができる。さらにガンドリル
Ａにて穴開け作業を行っている最中に発生した切削屑を
良好に排出させることができる。この外に請求項１の効
果をも発生しうる。Next, in the invention of claim 2, a shank portion 2 having a circular cross section is provided from the drill blade portion 1 through a neck portion 3 having a diameter smaller than the diameter of the drill blade portion 1, and the diameter of the shank portion 2 is Do not exceed the diameter of the drill blade portion 1 and make them substantially equal, and provide a notch groove 1a having a substantially V-shaped cross section in the longitudinal direction from the drill blade portion 1 to the neck portion 3, and provide a plurality of spirals on the outer periphery of the shank portion 2. The grooved groove 5 is provided, and the cutout groove 1a and the grooved groove 5 are in communication with each other through the neck portion 3, so that the cutout groove 1a is formed from the drill blade portion 1 to the neck portion 3.
Since the cross-section has a substantially V-shaped cross section in the longitudinal direction and the plurality of grooves 5 have a spiral shape, the cutting oil sent from the inside of the gun drill A is uniformly and smoothly applied to the outer periphery of the shank portion 2. It is possible to prevent the galling of the two shank portions. Further, the cutting waste generated during the drilling work by the gun drill A can be satisfactorily discharged. In addition to this, the effect of claim 1 can be generated.
図面は本発明の実施例を示すものであって、その第１図
は本発明の全体を示す側面図、第２図は本発明の要部の
拡大側面図、第３図は本発明の要部斜視図、第４図は第
２図IV−IV矢視断面図、第５図は第２図Ｖ−Ｖ矢視断面
図、第６図は本発明のガンドリルを工作機械に取り付け
て被加工物に穴開け加工をしようとしているところの側
面図、第７図はガンドリルが被加工物に穴開け加工をし
ているところの一部断面にした側面図、第８図はガンド
リルが穴開け加工をしているところの要部拡大図、第９
図は第８図IX−IX矢視断面図、第10図は第８図Ｘ−Ｘ矢
視断面図、第11図は第８図XI−XI矢視断面図、第12図は
シャンク部が被加工物の被加工穴に支持されている状態
を示す一部断面にした側面図、第13図は従来のガンドリ
ルによる穴開け加工の状態を示す一部断面にした側面
図、第14図は従来のガンドリルのドリル刃部が加工中に
振動している様子を示す略示図である。 １……ドリル刃部、1a……切欠き溝、 ２……シャンク部、３……首部、 ５……切削屑排出溝。The drawings show an embodiment of the present invention. FIG. 1 is a side view showing the whole of the present invention, FIG. 2 is an enlarged side view of an essential part of the present invention, and FIG. Partial perspective view, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is a sectional view taken along the line VV in FIG. 2, and FIG. 6 is a gun drill of the present invention attached to a machine tool for processing. Fig. 7 is a side view of a part where a hole is drilled on an object, Fig. 7 is a side view with a partial cross section of a part where a gun drill is drilling on a workpiece, and Fig. 8 is a hole drilled by a gun drill. Enlarged view of the main part where
Fig. 8 is a sectional view taken along the line IX-IX in Fig. 8, Fig. 10 is a sectional view taken along the line XX in Fig. 8, Fig. 11 is a sectional view taken along the line XI-XI in Fig. 8, and Fig. 12 shows a shank portion. A side view with a partial cross section showing the state of being supported by the hole to be processed, FIG. 13 is a side view with a partial cross section showing the state of drilling with a conventional gun drill, and FIG. 14 is It is a schematic diagram showing how a drill blade of a conventional gun drill vibrates during processing. 1 ... Drill blade part, 1a ... notch groove, 2 ... shank part, 3 ... neck part, 5 ... cutting chip discharge groove.
Claims (2)
も小径の首部を介して断面円形状のシャンク部を設け、
該シャンク部の直径がドリル刃部の直径を越えないで、
略同等とし、前記首部を介して前記ドリル刃部に設けた
切欠き溝とシャンク部に設けた複数の溝条とを連通状態
としたことを特徴としたガンドリル。1. A shank portion having a circular cross section is provided from a drill blade portion through a neck portion having a diameter smaller than the diameter of the drill blade portion,
The diameter of the shank does not exceed the diameter of the drill blade,
A gun drill characterized in that the notch groove provided in the drill blade portion and a plurality of grooved portions provided in the shank portion are in communication with each other through the neck portion so as to be substantially equal to each other.
も小径の首部を介して断面円形状のシャンク部を設け、
該シャンク部の直径がドリル刃部の直径を越えないで、
略同等とし、該ドリル刃部から首部にかけて長手方向に
断面略Ｖ字状の切欠き溝を設け、前記シャンク部の外周
に複数の螺旋状の溝条を設け、前記首部を介して前記切
欠き溝と前記溝条とを連通状態としたことを特徴とした
ガンドリル。2. A shank portion having a circular cross section is provided from a drill blade portion through a neck portion having a diameter smaller than the diameter of the drill blade portion,
The diameter of the shank does not exceed the diameter of the drill blade,
Almost the same, the cutout groove having a substantially V-shaped cross section is provided in the longitudinal direction from the drill blade portion to the neck portion, a plurality of spiral groove grooves are provided on the outer periphery of the shank portion, and the cutout portion is provided through the neck portion. A gun drill characterized in that the groove and the groove are in communication with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2226742A JP2562513B2 (en) | 1990-08-30 | 1990-08-30 | Gun drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2226742A JP2562513B2 (en) | 1990-08-30 | 1990-08-30 | Gun drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04111708A JPH04111708A (en) | 1992-04-13 |
| JP2562513B2 true JP2562513B2 (en) | 1996-12-11 |
Family
ID=16849897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2226742A Expired - Fee Related JP2562513B2 (en) | 1990-08-30 | 1990-08-30 | Gun drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2562513B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4843317B2 (en) * | 2006-01-26 | 2011-12-21 | 住友電工ハードメタル株式会社 | Long drill with guide |
| DE102007023168A1 (en) * | 2007-05-20 | 2008-11-27 | Gühring Ohg | Rotary drivable cutting tool |
| US20160207122A1 (en) * | 2015-01-15 | 2016-07-21 | X'pole Precision Tools Inc. | Blade fastening device having cuttign fluid guide grooves on a blade |
| EP3703904B1 (en) * | 2017-12-27 | 2023-06-21 | 3D Studio Engineering S.r.l. | Machine cutting tool and cooling method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5694213U (en) * | 1979-12-19 | 1981-07-27 | ||
| JPS5822210U (en) * | 1981-08-04 | 1983-02-10 | 三菱重工業株式会社 | gun drill |
-
1990
- 1990-08-30 JP JP2226742A patent/JP2562513B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04111708A (en) | 1992-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR950010255B1 (en) | Method of and tool for thread mill drilling | |
| US5094573A (en) | Multidirectional cutting tool | |
| US2895355A (en) | Drill shank for drills | |
| US6123490A (en) | Apparatus for machining round holes | |
| JP2020146831A (en) | Drill tool and drill method | |
| JP2562513B2 (en) | Gun drill | |
| KR101138676B1 (en) | Tool for chip removal with a central channel | |
| US2960892A (en) | Drilling tool | |
| KR100232740B1 (en) | Integral boring and threading tool and method | |
| JPH0852616A (en) | Stepped reamer | |
| JPH01109015A (en) | Bottle boring milling tool | |
| JPS62292306A (en) | Precision vibration boring method | |
| JP2000033506A (en) | Support for deep hole machining shaft | |
| JPS614608A (en) | Boring work control method in numerical control lathe | |
| JPS63216611A (en) | Drill | |
| JPS6165706A (en) | Cutting tool | |
| JP6835194B1 (en) | Drilling tool | |
| JP4217808B2 (en) | Core drill | |
| SU806275A1 (en) | Method of boring stepped holes | |
| JPS59209709A (en) | Tool | |
| JP3874060B2 (en) | Seat hole processing apparatus and processing method thereof | |
| JPH11156616A (en) | Boring cutter | |
| JP3227860U (en) | Core drill | |
| JP2004106065A (en) | Rotary cutting tool | |
| SU1450929A1 (en) | Drill for trepanning |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080919 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090919 Year of fee payment: 13 |
|
| LAPS | Cancellation because of no payment of annual fees |