JPS62136306A - Two-flute gun drill - Google Patents
Two-flute gun drillInfo
- Publication number
- JPS62136306A JPS62136306A JP27423985A JP27423985A JPS62136306A JP S62136306 A JPS62136306 A JP S62136306A JP 27423985 A JP27423985 A JP 27423985A JP 27423985 A JP27423985 A JP 27423985A JP S62136306 A JPS62136306 A JP S62136306A
- Authority
- JP
- Japan
- Prior art keywords
- gun drill
- cutting oil
- sectional shape
- cross
- holes
- 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.)
- Granted
Links
Landscapes
- Drilling Tools (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野Ｊ
この発明は、ムクチップの油穴の断面形状を、ガンドリ
ル本体の切削油供給孔の断面形状に合わせて略三角形状
に形成した二枚刃ガンドリルに関するものである。Detailed Description of the Invention: "Industrial Application Field J This invention provides a two-blade gun drill in which the cross-sectional shape of the oil hole of the solid tip is formed into a substantially triangular cross-sectional shape to match the cross-sectional shape of the cutting oil supply hole of the gun drill body. It is related to.
「従来の技術」
一般に、ガンドリルは、深穴加工を目的としていること
から、ドリル先端に切削油供給孔が設けられ、この供給
孔から圧油を噴出させ、切屑を強制的に切削穴から排出
するようにしている。このようなガンドリルの内、高送
り切削を目的としたものに、二枚刃ガンドリルがある。``Conventional technology'' Since gun drills are generally intended for deep hole drilling, a cutting oil supply hole is provided at the tip of the drill, and pressurized oil is spouted from this supply hole to forcefully discharge chips from the cutting hole. I try to do that. Among these gun drills, there is a two-flute gun drill that is intended for high-feed cutting.
従来、このような二枚刃ガンドリルとしては、第２図に
符号ｌで示すようなものが知られている。Conventionally, as such a two-flute gun drill, one shown by reference numeral l in FIG. 2 is known.
このガンドリルＩは、ガンドリル本体１’ｌを存してい
る。このガンドリル本体１１は、筒状のドライバ１２と
このドライバ１２の先端に接続されたシャンク１３とか
ら構成されている。このシャンク１３は、第３図に示す
ように、管状の部材から構成されており、その先端側で
周方向に１８０゜離間した２位置の管壁１３ａ、１３ａ
は、半径方向内方に突出して形成されている。そして、
これら内方へ突出した２つの管壁１３ａＳ １３ａは、
前記シャンク１３の内部に、２つの切削油供給孔１３ｂ
、１３ｂを形成しており、この切削油供給孔１３ｂは、
半径方向における幅が外周側から内周側へ向かうにした
がって漸次狭くなるように断面略三角形状に形成されて
いる。また、前記管壁１３ａ 、 １３ａの外壁面は
、それぞれ切屑排出溝１３ｃ、１３ｃを画成している。This gun drill I has a gun drill main body 1'l. The gun drill main body 11 is composed of a cylindrical driver 12 and a shank 13 connected to the tip of the driver 12. As shown in FIG. 3, this shank 13 is composed of a tubular member, and has two tube walls 13a, 13a spaced apart from each other by 180 degrees in the circumferential direction on its distal end side.
is formed to protrude radially inward. and,
These two inwardly protruding tube walls 13aS 13a are
Two cutting oil supply holes 13b are provided inside the shank 13.
, 13b, and this cutting oil supply hole 13b is
The cross section is formed into a substantially triangular shape so that the width in the radial direction becomes gradually narrower from the outer circumferential side toward the inner circumferential side. Further, the outer wall surfaces of the tube walls 13a, 13a define chip discharge grooves 13c, 13c, respectively.
このようなシャンク１３の先端には、超硬合金製のムク
チップ１４がろう付は固定されている。A solid tip 14 made of cemented carbide is fixed to the tip of the shank 13 by brazing.
このムクチップ１４は、前記シャンク１３より大径にな
されており、その先端には２つの切刃１４ａＳ １４ａ
が設けられている。一方、第４図に示すように、このム
クチップ１４の外周面の周方向に１８０°離間した２位
置には、軸方向にのびる切屑排出溝１４ｂ、１４ｂが設
けられている。また、このムクチップ１４の内部で、前
記切屑排出溝１４ｂ、１４ｂが設けられている位置から
周方向に９０°回転した位置には、油穴１４ｃ、１４Ｃ
が軸方向に延在して設けられており、この油穴１４ｃ
、 １４ｃはその両端を前記ムクチップの先端面と後
端面に開口せしめられている。このようなムクデツプ１
ｌＩは、その油穴１４ｃ、１４ｃを前記切削曲供給孔
１３ｂ、１３ｂに連通させるとともに、その切屑排出溝
１４ｂ、＋４ｂを前記切屑排出溝１３ｃ、１３ｃに接続
させて、その後端を前記シャンク１３の前端に固定され
ている。This solid tip 14 has a larger diameter than the shank 13, and has two cutting edges 14aS 14a at its tip.
is provided. On the other hand, as shown in FIG. 4, chip discharge grooves 14b, 14b extending in the axial direction are provided at two positions spaced apart by 180 degrees in the circumferential direction on the outer peripheral surface of the solid chip 14. Further, inside this solid chip 14, oil holes 14c, 14C are located at positions rotated 90° in the circumferential direction from the positions where the chip discharge grooves 14b, 14b are provided.
is provided extending in the axial direction, and this oil hole 14c
, 14c has both ends opened at the front end and rear end surfaces of the solid tip. This kind of mukdetsu 1
lI communicates its oil holes 14c, 14c with the cutting curve supply holes 13b, 13b, connects its chip discharge grooves 14b, +4b with the chip discharge grooves 13c, 13c, and connects the rear end of the shank 13 with the chip discharge grooves 13c, 13c. fixed at the front end.
この際、前記浦穴１４ｃと前記切削油供給孔１３ｂとの
詳細な位置関係は、第５図に示すようになっている。す
なわち、両者の位置関係は、断面略三角形状をなす切削
油供給孔１３ｂの内壁面の内、三角形の頂点位置の内壁
面が、断面円形状をなす油穴１４ｃの内壁面より半径方
向外方に位置し、切削油供給孔＋３ｂの内壁面の内、三
角形の各辺の中央位置の内壁面が、油穴１４ｃの内壁面
より半径方向内方に位置するようになっている。At this time, the detailed positional relationship between the hole 14c and the cutting oil supply hole 13b is as shown in FIG. That is, the positional relationship between the two is such that among the inner wall surfaces of the cutting oil supply hole 13b having a substantially triangular cross section, the inner wall surface at the apex of the triangle is radially outward from the inner wall surface of the oil hole 14c having a circular cross section. Among the inner wall surfaces of the cutting oil supply hole +3b, the inner wall surface at the center of each side of the triangle is located radially inward than the inner wall surface of the oil hole 14c.
［発明が解決しようとする問題点」
ところで、上記の二枚刃ガンドリルＩにあっては、シャ
ンク１３とムクチップ１４との接合部において、切削油
供給孔１３ｂに対して油穴１４ｃが第５図に示すように
位置せしめられている。このため、切削油供給孔１３ｂ
の流体通過断面積に対して、第６図中斜線で示す接合部
の流体通過断面積が小さくなり、切削油の供給量が少な
くなってしまうという問題点があった。また、シャンク
１３の断面積に対して、第７図中斜線で示すシャンク１
３とムクチップＩ４との接合面積が小さくなり、接合強
度が低下するという問題点があった。[Problems to be Solved by the Invention] Incidentally, in the above-mentioned two-flute gun drill I, at the joint between the shank 13 and the solid tip 14, the oil hole 14c is arranged as shown in FIG. 5 relative to the cutting oil supply hole 13b. It is located as shown. For this reason, the cutting oil supply hole 13b
There was a problem in that the fluid passage cross-sectional area of the joint shown by diagonal lines in FIG. 6 was smaller than that of the fluid passage cross-sectional area of . Also, with respect to the cross-sectional area of the shank 13, the shank 1 shown with diagonal lines in FIG.
There was a problem that the bonding area between No. 3 and the solid chip I4 became small, and the bonding strength decreased.
そこで、第８図に示すように、油穴１４ｃの円形の断面
形状を、切削油供給孔ｔａｂの略三角形の断面形状に外
接するように形成することが考えられるが、このように
すると、接合部の流体通過断面積を切削油供給孔１３ｂ
の流体通過断面積に一致さ仕ることができ切削油の供給
量を向上させることができるものの、ムクチップ１４と
シャンク１３との接合面積（図中斜線を施した部分）が
減少し、接合強度が低下してしまうのである。また、第
９図に示すように、油穴１４ｃの円形の断面形状を、切
削油供給孔１３ｂの略三角形の断面形状に内接するよう
に形成することも考えられるが、このようにすると、ム
クチップ１４とシャンク１３との接合面積をシャンク１
３の断面積に一竹六仕ることができ、接合強度を向上さ
せることができるものの、流体通過断面積（図中斜線を
施した部分）が減少し、切削油の供給量が減少してしま
うのである。Therefore, as shown in FIG. 8, it is conceivable to form the circular cross-sectional shape of the oil hole 14c so as to circumscribe the approximately triangular cross-sectional shape of the cutting oil supply hole tab. The fluid passage cross-sectional area of the cutting oil supply hole 13b
Although it is possible to improve the supply amount of cutting oil by matching the fluid passage cross-sectional area of will decrease. Further, as shown in FIG. 9, it is also possible to form the circular cross-sectional shape of the oil hole 14c so as to be inscribed in the approximately triangular cross-sectional shape of the cutting oil supply hole 13b. The joint area between 14 and shank 13 is shank 1
Although it is possible to improve the joint strength by increasing the cross-sectional area of 3, the fluid passage cross-sectional area (the shaded area in the figure) decreases, and the amount of cutting oil supplied decreases. It's put away.
「発明の目的」
この発明は、切削油の供給量を増加させることができる
とともに、ムクチップとガンドリル本体との接合部の強
度を向上させることができる二枚刃ガンドリルを提供す
ることを目的とする。``Object of the Invention'' The object of the present invention is to provide a two-blade gun drill that can increase the amount of cutting oil supplied and improve the strength of the joint between the solid tip and the gun drill body. .
「発明の構成」
この発明は、２つの油穴の断面形状を、ガンドリル本体
の２つの切削油供給孔の断面形状に合わせて略三角形状
に形成した構成としたものである。[Configuration of the Invention] The present invention has a configuration in which the cross-sectional shape of the two oil holes is formed into a substantially triangular shape to match the cross-sectional shape of the two cutting oil supply holes of the gun drill body.
「実施例」
以下、この発明の一実施例について第１図を参照して説
明する。なお、これらの図において、従来例と同一構成
の部分には同一符号を付して、その説明を省略する。"Embodiment" An embodiment of the present invention will be described below with reference to FIG. In addition, in these figures, the same reference numerals are given to the parts having the same configuration as those of the conventional example, and the explanation thereof will be omitted.
第１図は、この発明に係る二枚刃ガンドリル２のムクチ
ップ２１を示す図である。このムクチッブ２１は、従来
例と同様に、シャンク１３の先端に固定されており、軸
方向に延びる２つの油穴２Ｉａ、２１ａを有している。FIG. 1 is a diagram showing a solid tip 21 of a two-blade gun drill 2 according to the present invention. Similar to the conventional example, this mucchib 21 is fixed to the tip of the shank 13, and has two oil holes 2Ia and 21a extending in the axial direction.
このような二枚刃ガンドリル２において、前記２つの油
穴２１ａ、２１ａの断面形状は、前記シャンク１３の切
削油供給孔１３ｂ、１３ｂの断面形状に合わせて略三角
形状になされている。In such a two-blade gun drill 2, the cross-sectional shape of the two oil holes 21a, 21a is substantially triangular in accordance with the cross-sectional shape of the cutting oil supply holes 13b, 13b of the shank 13.
このように、この二枚刃ガンドリル２にあっては、２つ
の油穴２１ａ、２１ａの断面形成を２つの切削油供給孔
１３ｂ１１３ｂに合わせて略三角形状に形成しているか
ら、ムクチップ２１とシャンク１３との接合部の流体通
過断面積を２つの切削油供給孔１３ｂ、１３ｂの流体通
過断面積と同じにすることができ、切削油の供給量を増
加させることができる。したがって、仕上（デ面精度を
向上させることができるとともに高送り切削を行うこと
ができる。また同時に、ムクチップ２１とシャンク１３
との接合部の接合面積をシャンク１３の断面積と同一に
とることができ、ムクチップ２１とシャンク１３との接
合強度を向上させることができる。In this way, in this two-blade gun drill 2, the cross section of the two oil holes 21a and 21a is formed into a substantially triangular shape to match the two cutting oil supply holes 13b and 113b. 13 can be made the same as the fluid passage cross-sectional area of the two cutting oil supply holes 13b, 13b, and the amount of cutting oil supplied can be increased. Therefore, it is possible to improve finishing (desurface accuracy) and perform high-feed cutting.
The joint area of the joint with the shank 13 can be made the same as the cross-sectional area of the shank 13, and the joint strength between the solid tip 21 and the shank 13 can be improved.
なお、上記実施例においては、ムクチップとノヤンクと
はろうイ」けによって固定されているが、これに限る必
要はなく、他の固定方法でもよい。In addition, in the above-mentioned embodiment, the solid tip and the noyank are fixed by a solder joint, but there is no need to be limited to this, and other fixing methods may be used.
「発明の効果」
以上に説明したように、この発明によれば、２つの油穴
の断面形状を、ガンドリル本体の２つの切削油供給孔の
断面形状に合わせて略三角形状に形成しているから、切
削油の供給量を増加させることができるとともに、ムク
チップとガンドリル本体との接合部の強度を向上させる
ことができるという効果かえられる。"Effects of the Invention" As explained above, according to the present invention, the cross-sectional shape of the two oil holes is formed into a substantially triangular shape to match the cross-sectional shape of the two cutting oil supply holes of the gun drill body. As a result, the amount of cutting oil supplied can be increased, and the strength of the joint between the solid tip and the gun drill body can be improved.
第１図は本発明の一実施例を示す軸線方向先端視図、第
２図ないし第７図は従来の二枚刃ガンドリルを示す図で
あって、第２図はその側面図、第３図は第２図中■−■
線視断面図、第４図は第２図中■矢視図、第５図は第２
図中■−■線視拡大断面図、第６図はムクチップとシャ
ンクとの接合部の流体通過断面を示す図、第７図はムク
チップとシャンクとの接合部の接合面積を示す図、第８
図および第９図はムクチップとシャンクとの接合部にお
ける油穴と切削油供給孔との関係を適宜変えた状態を示
す図である。
２・・・・・・二枚刃ガンドリル、１１・・・・・・ガ
ンドリル本体、１３ｂ・・・・・・切削油供給孔、２１
・・・・・・ムクチップ、２１ａ・・・・・・油穴。FIG. 1 is an axial tip end view showing an embodiment of the present invention, FIGS. 2 to 7 are views showing a conventional two-flute gun drill, FIG. 2 is a side view thereof, and FIG. ■-■ in Figure 2
Linear sectional view, Figure 4 is a view from the ■ arrow in Figure 2, Figure 5 is a
Figure 6 is an enlarged cross-sectional view taken along the line ■-■ in the figure, Figure 6 is a diagram showing a fluid passage cross section at the joint between the Muku tip and the shank, Figure 7 is a diagram showing the joint area of the joint between the Muku tip and the shank, and Figure 8 is a diagram showing the joint area of the joint between the Muku tip and the shank.
9 and 9 are diagrams showing a state in which the relationship between the oil hole and the cutting oil supply hole at the junction between the solid tip and the shank is changed as appropriate. 2...Two-blade gun drill, 11...Gun drill body, 13b...Cutting oil supply hole, 21
...Mukuchip, 21a...Oil hole.
Claims (1)
ル本体の先端部に、前記各切削油供給孔にそれぞれ連通
した油穴を有する超硬合金製のムクチップを設けてなり
、前記切削油供給孔を径方向における幅が外周側から内
周側へ向かうにしたがって漸次狭くなるように断面略三
角形状とした二枚刃ガンドリルにおいて、前記２つの油
穴の断面形状を、前記ガンドリル本体の２つの切削油供
給孔の断面形状に合わせて略三角形状に形成したことを
特徴とする二枚刃ガンドリル。A solid carbide tip made of cemented carbide having oil holes communicating with each of the cutting oil supply holes is provided at the tip of a gun drill body having two cutting oil supply holes extending in the axial direction. In a two-blade gun drill having a substantially triangular cross-section so that the width in the radial direction gradually narrows from the outer circumferential side to the inner circumferential side, the cross-sectional shape of the two oil holes is formed by two cutting oils in the gun drill body. A two-blade gun drill characterized by being formed into a substantially triangular shape to match the cross-sectional shape of the supply hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27423985A JPS62136306A (en) | 1985-12-05 | 1985-12-05 | Two-flute gun drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27423985A JPS62136306A (en) | 1985-12-05 | 1985-12-05 | Two-flute gun drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62136306A true JPS62136306A (en) | 1987-06-19 |
| JPH0258041B2 JPH0258041B2 (en) | 1990-12-06 |
Family
ID=17538937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27423985A Granted JPS62136306A (en) | 1985-12-05 | 1985-12-05 | Two-flute gun drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62136306A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6442816U (en) * | 1987-09-09 | 1989-03-14 | ||
| US7134813B2 (en) * | 2002-12-19 | 2006-11-14 | Joerg Guehring | Cooling channel geometry |
| US20150321267A1 (en) * | 2013-01-29 | 2015-11-12 | Osg Corporation | Drill |
| US20160031016A1 (en) * | 2013-03-26 | 2016-02-04 | Osg Corporation | Three-bladed drill with cutting fluid supply hole |
| DE102014013210A1 (en) | 2014-09-06 | 2016-03-10 | Audi Ag | Cutting tool with a cooling channel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5817692U (en) * | 1981-07-28 | 1983-02-03 | ソニー株式会社 | playback device |
-
1985
- 1985-12-05 JP JP27423985A patent/JPS62136306A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5817692U (en) * | 1981-07-28 | 1983-02-03 | ソニー株式会社 | playback device |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6442816U (en) * | 1987-09-09 | 1989-03-14 | ||
| US7134813B2 (en) * | 2002-12-19 | 2006-11-14 | Joerg Guehring | Cooling channel geometry |
| US20150321267A1 (en) * | 2013-01-29 | 2015-11-12 | Osg Corporation | Drill |
| US9604286B2 (en) | 2013-01-29 | 2017-03-28 | Osg Corporation | Drill |
| US20160031016A1 (en) * | 2013-03-26 | 2016-02-04 | Osg Corporation | Three-bladed drill with cutting fluid supply hole |
| US9623490B2 (en) * | 2013-03-26 | 2017-04-18 | Osg Corporation | Three-bladed drill with cutting fluid supply hole |
| DE102014013210A1 (en) | 2014-09-06 | 2016-03-10 | Audi Ag | Cutting tool with a cooling channel |
| DE102014013210B4 (en) | 2014-09-06 | 2021-10-21 | Audi Ag | Cutting tool with a cooling channel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0258041B2 (en) | 1990-12-06 |
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