JPS63245310A - Drill - Google Patents
DrillInfo
- Publication number
- JPS63245310A JPS63245310A JP62075197A JP7519787A JPS63245310A JP S63245310 A JPS63245310 A JP S63245310A JP 62075197 A JP62075197 A JP 62075197A JP 7519787 A JP7519787 A JP 7519787A JP S63245310 A JPS63245310 A JP S63245310A
- Authority
- JP
- Japan
- Prior art keywords
- plane
- drill
- chip
- curvature
- chip discharging
- 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.)
- Pending
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 230000003746 surface roughness Effects 0.000 claims description 7
- 238000005553 drilling Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract 8
- 239000010953 base metal Substances 0.000 description 14
- 238000003754 machining Methods 0.000 description 10
- 239000003921 oil Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010730 cutting oil Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Landscapes
- Drilling Tools (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は、円柱状の工具本体にその先端部から後方に
向って２つの切屑排出溝が設けられたドリルに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a drill in which a cylindrical tool body is provided with two chip discharge grooves extending rearward from its tip.
「従来の技術」
従来、上記のようなドリルとしては、第７図および第８
図に示すようなドリル１１が知られている。このドリル
１１は、台金１２の先端に超硬合金からなるむくチップ
１３がろう付けされている。``Prior art'' Conventionally, the drills as described above are as shown in Fig. 7 and 8.
A drill 11 as shown in the figure is known. In this drill 11, a solid tip 13 made of cemented carbide is brazed to the tip of a base metal 12.
前記台金１２および前記むくチップ１３は、断面略円形
状の台金本体１４およびむくチップ本体１５を有してい
る。この台金本体１４およびむくチップ本体１５の外周
には、周方向に等間隔に２つの切屑排出′ｆＰｔｌ ６
．１６が前記むくチップ本体１５の先端から台金本体１
４の後部に向って形成されている。この切屑排出溝１６
は、回転方向を向く第１の平面１７と回転方向と反対の
方向を向く第２の平面Ｉ８とによって画成されている。The base metal 12 and the bare chip 13 have a base metal body 14 and a bare chip body 15 each having a substantially circular cross section. On the outer periphery of the base metal body 14 and the peeled chip body 15, there are two chip discharge holes spaced at equal intervals in the circumferential direction.
．． 16 is the base metal body 1 from the tip of the peeled chip body 15.
4 toward the rear. This chip discharge groove 16
is defined by a first plane 17 facing in the direction of rotation and a second plane I8 facing in a direction opposite to the direction of rotation.
そして、前記むくチップ１３の前記第１の平面１７の先
端部には、切刃１９が設けられている。また、前記台金
本体１４の軸心部には、断面円形状の給油孔２０が形成
されており、前記むくチップ１３の先端面には、前記給
油孔２０に連通した袖穴２１が形成されている。そして
、前記切刃１９に対して、前記給油孔２０を通して前記
袖穴２１から切削曲を供給するようになっている。A cutting edge 19 is provided at the tip of the first flat surface 17 of the peeling tip 13. Further, an oil supply hole 20 having a circular cross section is formed in the axial center of the base metal body 14, and a sleeve hole 21 communicating with the oil supply hole 20 is formed in the tip end surface of the peeled tip 13. ing. A cutting curve is supplied to the cutting edge 19 from the side hole 21 through the oil supply hole 20.
「発明が解決しようとする問題点」
ところで、上記ドリルＩＩにあっては、切屑排出性を向
上させようとして、切屑排出溝の断面積を増加させると
、軸心部の肉厚が薄（なり剛性が低下する。また、剛性
を向上させようとして、軸心部の肉厚を厚くすると、切
屑排出溝の断面積が減少してしまい切屑排出性が低下す
る。さらに、切屑排出溝の内壁が研削されおらず仕上げ
面が荒いため、切屑が引っ掛かり、切屑の排出性が悪い
。"Problems to be Solved by the Invention" By the way, in the drill II described above, when the cross-sectional area of the chip evacuation groove is increased in an attempt to improve the chip evacuation performance, the wall thickness of the shaft center portion becomes thin (becomes thinner). Rigidity decreases.Furthermore, if the thickness of the shaft center portion is increased in an attempt to improve rigidity, the cross-sectional area of the chip evacuation groove decreases, reducing chip evacuation performance.Furthermore, the inner wall of the chip evacuation groove decreases. Since it is not ground and the finished surface is rough, chips get caught and have poor chip evacuation.
このため、高い切屑排出性と高いドリル剛性とがともに
要求される高送り加工を行うことができないという問題
点があった。Therefore, there has been a problem that high-feed machining, which requires both high chip evacuation and high drill rigidity, cannot be performed.
「問題点を解決するための手段」
この発明は、上記の問題点を解決するためになされたも
ので、切屑排出溝を画成する壁面が、回転方向を向く第
１の平面と、回転方向と反対の方向を向く第２の平面と
、前記第１の平面と前記第２の平面との間に設けられた
第３の面とを備え、前記第３の面は、前記第１の平面の
内周側端縁と前記第２の平面の内周側端縁との間に設け
られ、かつ前記第３の面の曲率が、前記第１の平面と前
記第２の平面とにそれぞれの内周側端縁で接する断面円
弧状の曲面の曲率と同等もしくはそれ以下になるように
設けられ、前記切屑排出溝を画成する壁面の表面荒さが
０．８−Ｓ以下になされた構成とされている。"Means for Solving the Problems" The present invention has been made to solve the above problems, and the wall surface defining the chip discharge groove has a first plane facing the rotation direction and a first plane facing the rotation direction. a second plane facing in the opposite direction, and a third plane provided between the first plane and the second plane, the third plane facing in the opposite direction to the first plane. is provided between an inner peripheral edge of the second plane and an inner peripheral edge of the second plane, and the curvature of the third plane is different from that of the first plane and the second plane. The groove is provided so that the curvature is equal to or less than the curvature of a curved surface having an arcuate cross section that touches the inner peripheral edge, and the surface roughness of the wall surface defining the chip discharge groove is 0.8-S or less. has been done.
「作用」
この発明は、切屑排出溝を画成する壁面が、回転方向を
向く第１の平面と、回転方向と反対の方向を向く第２の
平面と、前記第１の平面と前記第２の平面との間に設け
られた第３の面とを備え、前記第３の面は、前記第１の
平面の内周側端縁と前記第２の平面の内周側端縁との間
に設けられ、かつ前記第３の面の曲率か、前記第１の平
面と前記第２の平面とにそれぞれの内周側端縁で接する
断面円弧状の曲面の曲率と同等もしくはそれ以下になる
ように設けられ、前記切屑排出溝を画成する壁面の表面
荒さが０．８−Ｓ以下になされているから、切屑排出溝
の断面積を増加し切屑排出性を向上させつつ、ドリルの
断面係数を増加し剛性を向上させることができる。また
、切屑が切屑排出溝の壁面に引っ掛かるのを防止し、切
屑の排出をスムーズに行うことができる。したがって、
切屑排出性能とドリルの剛性とを共に向上させることが
でき、その結果、高送り加工、ブツシュレス加工、深穴
加工を行うことができ、高精度穴明は加工を行うことが
できる。"Function" This invention provides that the wall surface defining the chip discharge groove has a first plane facing the rotation direction, a second plane facing the opposite direction to the rotation direction, and the first plane and the second plane facing the rotation direction. and a third surface provided between the inner circumferential edge of the first plane and the inner circumferential edge of the second plane. and the curvature of the third surface is equal to or less than the curvature of a curved surface having an arcuate cross section that touches the first plane and the second plane at their respective inner peripheral edges. Since the surface roughness of the wall surface defining the chip discharge groove is set to 0.8-S or less, the cross-sectional area of the chip discharge groove is increased and chip evacuation performance is increased, while the cross-sectional area of the drill is The stiffness can be improved by increasing the coefficient. Further, it is possible to prevent chips from getting caught on the wall surface of the chip discharge groove, and to smoothly discharge chips. therefore,
It is possible to improve both the chip evacuation performance and the rigidity of the drill, and as a result, it is possible to perform high-feed machining, buttless machining, deep hole machining, and high-precision hole drilling.
「実施例」
以下、この発明の一実施例について第１図ないし第６図
を参照して説明する。"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
第１図ないし第３図は、この発明に係るドリル３１を示
す図である。このドリル３■は、台金３２の先端に超硬
合金からなるむくチップ３３がろう付けされている。前
記台金３２および前記むくチップ３３は、断面略円形状
の台金本体（工具本体）３４およびむくチップ本体（工
具本体）３５を有している。この台金本体３４およびむ
くチップ本体３５の外周には、周方向に等間隔に２つの
切屑排出１Ｍ３６．３６が前記むくチップ本体３５の先
端から台金本体３４の後部に向って形成されている。こ
の切屑排出溝３６を画成する壁面３７は、回転方向を向
く第１の平面３８と、回転方向と反対の方向を向く第２
の平面３９と、前記第１の平面３８と前記第２の平面３
９との間に形成された第３の平面（第３の面）４０とを
備えている。前記第３の平面４０は、前記第１の平面３
８の内周側端縁と前記第２の平面３９の内周側端縁との
間に設けられ、半径方向外方を向いて配設されている。1 to 3 are diagrams showing a drill 31 according to the present invention. In this drill 32, a solid tip 33 made of cemented carbide is brazed to the tip of a base metal 32. The base metal 32 and the peeling tip 33 have a base metal body (tool body) 34 and a peeling tip body (tool body) 35 having a substantially circular cross section. On the outer peripheries of the base metal body 34 and the peeled tip body 35, two chip discharges 1M36.36 are formed at equal intervals in the circumferential direction from the tip of the peeled tip body 35 toward the rear of the base metal body 34. . The wall surface 37 defining the chip discharge groove 36 has a first plane 38 facing the direction of rotation and a second plane 38 facing the direction opposite to the direction of rotation.
a plane 39 , the first plane 38 and the second plane 3
9 and a third plane (third surface) 40. The third plane 40 is the first plane 3
8 and the inner circumferential edge of the second plane 39, facing outward in the radial direction.
また、前記第３の平面４０と前記第１の平面３８との交
差部および前記第３の平面４０と前記第２の平面３９と
の交差部には、両平面を滑らかに接続するアール面４１
，４１が形成されており、応力の集中を防止できるよう
になっている。In addition, at the intersection of the third plane 40 and the first plane 38 and the intersection of the third plane 40 and the second plane 39, there is a rounded surface 41 that smoothly connects both planes.
, 41 are formed to prevent stress concentration.
ここで、前記第１の平面３８、第２の平面３９、第３の
平面４０、アール面４１等の切屑排出溝３６を画成する
壁面３７は、切屑の排出をスムーズに行うため、研削に
より表面荒さが０．８−Ｓ以下になされている。これは
、表面荒さを０．８−８以上にすると、切屑が切屑排出
溝３６を画成する壁面３７に引っ掛かり、スムーズな切
屑排出ができないからである。Here, the wall surfaces 37 defining the chip discharge groove 36, such as the first plane 38, second plane 39, third plane 40, and rounded surface 41, are ground by grinding in order to smoothly discharge chips. The surface roughness is 0.8-S or less. This is because if the surface roughness is 0.8-8 or more, chips will get caught on the wall surface 37 defining the chip discharge groove 36, making it impossible to smoothly discharge the chips.
一方、前記台金本体３４およびむくチップ本体３５のラ
ンド部４２のうち前記切屑排出溝３６に隣接する端部に
は、マージン４３，４３が設けられており、これらマー
ジン４３．４３の間には内周側へ後退した二番取り面４
４が形成されている。On the other hand, margins 43, 43 are provided at the ends of the land portions 42 of the base metal body 34 and the peeled chip body 35 adjacent to the chip discharge groove 36, and between these margins 43, 43, Second chamfer surface 4 retreated toward the inner circumference
4 is formed.
また、前記マージン４３の外周面と前記第２の平面３９
との交差部には、面取り而４５が形成されており、応力
集中を防ぎ、割・れの発生を防止するようになっている
。Further, the outer peripheral surface of the margin 43 and the second plane 39
A chamfer 45 is formed at the intersection with the metal plate to prevent stress concentration and the occurrence of cracks.
前記むくチップ本体３５の前記第１の平面３８の先端部
には、切刃４６が設けられている。また、前記台金本体
３４の軸心部には、断面円形状の給油孔４７が形成され
ており、前記むくチップ本体３５の先端面には、前記給
油孔４７に連通した袖穴、１８．４８が形成されている
。そして、前記切刃４６に対して、前記給油孔４７を通
して前記浦穴４８から切削油を供給するようになってい
る。A cutting edge 46 is provided at the tip of the first plane 38 of the peeling tip body 35. Further, an oil supply hole 47 having a circular cross section is formed in the axial center of the base metal main body 34, and a sleeve hole 18. 48 is formed. Cutting oil is supplied to the cutting blade 46 from the hole 48 through the oil supply hole 47.
このように、このドリル３１にあっては、切屑排出溝３
６を画成する壁面３７が、回転方向を向く第１の平面３
８と、回転方向と反対の方向を向く第２の平面３９と、
前記第１の平面３８と前記第２の平面３９との間に設け
られ半径方向外方を向く第３の平面４０とを備え、前記
切屑排出溝３６を画成する壁面３７の表面荒さが０．８
−Ｓ以下になされているから、切屑排出溝３６の断面積
を増加し切屑排出性を向上させつつ、ドリルの断面係数
を増加しドリルの剛性を向上させることができる。また
、切屑が切屑排出溝３６の壁面３７に引っ掛かるのを防
止し、切屑の排出をスムーズに行、うことかできる。し
たがって、ドリルの切屑排出性とドリルの剛性とを共に
向上させることができ、その結果、高送り加工、ブツシ
ュレス加工、深穴加工を行うことができ、高精度穴明は
加工を行うことができる。In this way, in this drill 31, the chip discharge groove 3
The wall surface 37 defining the first plane 3 faces the direction of rotation.
8, and a second plane 39 facing in a direction opposite to the direction of rotation.
A third plane 40 is provided between the first plane 38 and the second plane 39 and faces radially outward, and the wall surface 37 defining the chip discharge groove 36 has a surface roughness of 0. .8
-S or less, it is possible to increase the cross-sectional area of the chip evacuation groove 36 and improve chip evacuation performance, while increasing the section modulus of the drill and improving the rigidity of the drill. Further, the chips are prevented from getting caught on the wall surface 37 of the chip discharge groove 36, and the chips can be smoothly discharged. Therefore, both the chip evacuation performance and the rigidity of the drill can be improved, and as a result, high-feed machining, buttless machining, and deep hole machining can be performed, and high-precision hole drilling can be performed. .
なお、上記実施例においては、第３の面として平面状の
第３の平面４０を採用しているが、これに限る必要はな
く、第４図および第５図に示すように、前記第１の平面
３８の内周側端縁と前記第２の平面３９の内周側端縁と
の間に設けられ、かつ前記第１の平面３８と前記第２の
平面３９とにそれぞれの内周側端縁で接する断面円弧状
の曲面５１でもよい。また、第６図に示すように、前記
第１の平面３８の内周側端縁と前記第２の平面３９の内
周側端縁との間に設けられ、その曲率が、前記断面円弧
状の曲面５１より小さい曲面５２ないしは５３でもよい
。In the above embodiment, a planar third plane 40 is used as the third surface, but there is no need to limit it to this, and as shown in FIGS. 4 and 5, the first is provided between the inner circumference side edge of the plane 38 and the inner circumference side edge of the second plane 39, and the inner circumference side of each of the first plane 38 and the second plane 39 is provided. It may also be a curved surface 51 having an arcuate cross section and touching at the end edges. Further, as shown in FIG. 6, the second plane is provided between the inner circumferential edge of the first plane 38 and the inner circumferential edge of the second plane 39, and the curvature thereof is shaped like the arcuate cross section. The curved surface 52 or 53 may be smaller than the curved surface 51.
「発明の効果」
以上に説明したように、この発明によれば、切屑排出溝
を画成する壁面が、回転方向を向く第１の平面と、回転
方向と反対の方向を向く第２の平面と、前記第１の平面
と前記第２の平面との間に設けられた第３の而とを備え
、前記第３の面は、前記第１の平面の内周側端縁と前記
第２の平面の内周側端縁との間に設けられ、かつ前記第
３の面の曲率が、前記第１の平面と前記第２の平面とに
それぞれの内周側端縁で接する断面円弧状の曲面の曲率
と同等らしくはそれ以下になるように設けられ、前記切
屑排出溝を画成する壁面の表面荒さが０．８−Ｓ以下に
なされているから、切屑排出溝の断面積を増加し切屑排
出性を向上させつつ、ドリルの断面係数を増加しドリル
の剛性を向上させることができ、さらに切屑が切屑排出
溝の壁面に引っ掛かるのを防止し、切屑の排出をスムー
ズに行うことができ、したがって切屑排出性能とドリル
の剛性とを共に向上させることができ、その結果、高送
り加工、ブツシュレス加工、深穴加工を行うことができ
、高精度穴明は加工を行うことができるという効果が得
られる。"Effects of the Invention" As explained above, according to the present invention, the wall surface defining the chip discharge groove has a first plane facing the rotation direction and a second plane facing the opposite direction to the rotation direction. and a third surface provided between the first plane and the second plane, the third plane being between the inner peripheral edge of the first plane and the second plane. and the third surface has an arcuate cross-section, and the third surface has a curvature that is in contact with the first plane and the second plane at their respective inner circumferential edges. Since the curvature of the chip discharge groove is set to be equal to or less than the curvature of the curved surface of the chip discharge groove, and the surface roughness of the wall surface defining the chip discharge groove is set to 0.8-S or less, the cross-sectional area of the chip discharge groove is increased. This improves chip evacuation performance, increases the section modulus of the drill, and improves the rigidity of the drill.Furthermore, it prevents chips from getting caught on the wall of the chip evacuation groove, allowing smooth evacuation of chips. Therefore, it is possible to improve both the chip evacuation performance and the rigidity of the drill, and as a result, it is possible to perform high-feed machining, buttless machining, deep hole machining, and high-precision hole drilling. Effects can be obtained.
第１図ないし第３図は本発明の一実施例を示す図であっ
て、第１図は第３図中矢印！−１線に沿う矢視断面図、
第２図は軸線方向先端挽回、第３図は側面図、第４図お
よび第５図は本発明の他の実施例を示す図であって、第
４図は第１図と同様の位置の断面図、第５図は軸線方向
先端挽回、第６図はドリルの第３の面のさらに他の実施
例を示す図、第７図および第８図は従来のドリルの一例
を示す図であって、第７図はその側面図、第８図は第７
図中■−■線に沿う矢視断面図である。
３Ｉ・・・・・・ドリル、３４・・・・・台金本体（工
具本体）、３５・・・・・・むくチップ本体（工具本体
）、３６・・・・・切屑排出溝、３７・・・・・・壁面
、３８・・・・・・第１の平面、３９・・・・・・第２
の平面、４０・・・・・・第３の平面（第３の面）、５
１，５２．５３・・・・・・曲面（第３の而）。1 to 3 are diagrams showing one embodiment of the present invention, and FIG. 1 is indicated by the arrow ! in FIG. 3. -A cross-sectional view taken along the line 1,
FIG. 2 shows axial tip recovery, FIG. 3 is a side view, and FIGS. 4 and 5 show other embodiments of the present invention, with FIG. 4 showing the same position as FIG. 1. FIG. 5 is a cross-sectional view showing the tip retraction in the axial direction, FIG. 6 is a view showing still another embodiment of the third surface of the drill, and FIGS. 7 and 8 are views showing an example of a conventional drill. Figure 7 is its side view, Figure 8 is its side view, and Figure 8 is its side view.
It is a sectional view taken along the line ■-■ in the figure. 3I... Drill, 34... Base metal body (tool body), 35... Peeling tip body (tool body), 36... Chip discharge groove, 37. ... Wall surface, 38 ... First plane, 39 ... Second plane
plane, 40...Third plane (third surface), 5
1,52.53...Curved surface (third concept).
Claims (1)
後方に向って２つの切屑排出溝が設けられたドリルにお
いて、前記切屑排出溝を画成する壁面が、回転方向を向
く第１の平面と、回転方向と反対の方向を向く第２の平
面と、前記第１の平面と前記第２の平面との間に設けら
れた第３の面とを備え、前記第３の面は、前記第１の平
面の内周側端縁と前記第２の平面の内周側端縁との間に
設けられ、かつ前記第３の面の曲率が、前記第１の平面
と前記第２の平面とにそれぞれの内周側端縁で接する断
面円弧状の曲面の曲率と同等もしくはそれ以下になるよ
うに設けられ、前記切屑排出溝を画成する壁面の表面荒
さが０．８−Ｓ以下になされたことを特徴とするドリル
。In a drill provided with a cylindrical tool body and two chip discharge grooves provided rearward from the tip of the tool body, the wall surface defining the chip discharge grooves is a first plane facing the rotation direction. a second plane facing in a direction opposite to the direction of rotation, and a third plane provided between the first plane and the second plane, the third plane being The third surface is provided between an inner circumferential edge of the first plane and an inner circumferential edge of the second plane, and the curvature of the third plane is the same as that of the first plane and the second plane. The grooves are provided so that the curvature is equal to or less than the curvature of the curved surface having an arcuate cross-section that contacts at the inner peripheral edge of each groove, and the surface roughness of the wall surface defining the chip discharge groove is 0.8-S or less. A drill featuring what has been done.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62075197A JPS63245310A (en) | 1987-03-28 | 1987-03-28 | Drill |
| KR1019880000405A KR940011176B1 (en) | 1987-03-04 | 1988-01-20 | Drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62075197A JPS63245310A (en) | 1987-03-28 | 1987-03-28 | Drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63245310A true JPS63245310A (en) | 1988-10-12 |
Family
ID=13569228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62075197A Pending JPS63245310A (en) | 1987-03-04 | 1987-03-28 | Drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63245310A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7740426B2 (en) | 2002-10-02 | 2010-06-22 | Osg Corporation | Deep-hole drill having back-tapered web |
| WO2010140606A1 (en) * | 2009-06-02 | 2010-12-09 | 株式会社タンガロイ | Cutting edge replaceable drill and drill main body |
| WO2013038565A1 (en) * | 2011-09-16 | 2013-03-21 | オーエスジー株式会社 | Drill body of indexable drill and manufacturing method therefor |
-
1987
- 1987-03-28 JP JP62075197A patent/JPS63245310A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7740426B2 (en) | 2002-10-02 | 2010-06-22 | Osg Corporation | Deep-hole drill having back-tapered web |
| WO2010140606A1 (en) * | 2009-06-02 | 2010-12-09 | 株式会社タンガロイ | Cutting edge replaceable drill and drill main body |
| JPWO2010140606A1 (en) * | 2009-06-02 | 2012-11-22 | 株式会社タンガロイ | Replaceable tip drill and drill body |
| CN102802850A (en) * | 2009-06-02 | 2012-11-28 | 株式会社钨钛合金 | Cutting edge replaceable drill and drill main body |
| US8393831B2 (en) | 2009-06-02 | 2013-03-12 | Tungaloy, Corporation | Indexable drill and drill body |
| WO2013038565A1 (en) * | 2011-09-16 | 2013-03-21 | オーエスジー株式会社 | Drill body of indexable drill and manufacturing method therefor |
| CN103796781A (en) * | 2011-09-16 | 2014-05-14 | Osg株式会社 | Drill body of indexable drill and manufacturing method therefor |
| JPWO2013038565A1 (en) * | 2011-09-16 | 2015-03-23 | オーエスジー株式会社 | Drill body of indexable drill and manufacturing method thereof |
| EP2756901A4 (en) * | 2011-09-16 | 2015-05-13 | Osg Corp | Drill body of indexable drill and manufacturing method therefor |
| US9446457B2 (en) | 2011-09-16 | 2016-09-20 | Osg Corporation | Drill body of indexable drill |
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