JPS63245311A - Drill - Google Patents
DrillInfo
- Publication number
- JPS63245311A JPS63245311A JP62076803A JP7680387A JPS63245311A JP S63245311 A JPS63245311 A JP S63245311A JP 62076803 A JP62076803 A JP 62076803A JP 7680387 A JP7680387 A JP 7680387A JP S63245311 A JPS63245311 A JP S63245311A
- Authority
- JP
- Japan
- Prior art keywords
- plane
- drill
- curvature
- chip discharging
- tip
- 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
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 12
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 7
- 238000005299 abrasion Methods 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000010953 base metal Substances 0.000 description 13
- 238000003754 machining Methods 0.000 description 11
- 239000003921 oil Substances 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 230000003746 surface roughness Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BFCDFTHTSVTWOG-PXNSSMCTSA-N (1r,2s)-2-(octylamino)-1-(4-propan-2-ylsulfanylphenyl)propan-1-ol Chemical compound CCCCCCCCN[C@@H](C)[C@H](O)C1=CC=C(SC(C)C)C=C1 BFCDFTHTSVTWOG-PXNSSMCTSA-N 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 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、スヂール製の台金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。前記台金！２
および前記むくデツプ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Ｍ１６，１６が前記むくチッ
プ本体１５の先端から台金本体１４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
１８とによって画成されている。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に連通した油
水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を通して前記油水２Ｉから切削曲を
供給するようになっている。``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 made of Sudil. Said base money! 2
The bare depth 13 has a base metal body 14 and a bare tip body 15 each having a substantially circular cross section. On the outer peripheries of the base metal body 14 and the peeled tip body 15, two chip discharges M16, 16 are formed at equal intervals in the circumferential direction from the tip of the peeled tip body 15 toward the rear of the base metal body 14. . This chip discharge groove 16 is defined by a first plane 17 facing the direction of rotation and a second plane 18 facing the direction opposite to the direction of rotation. 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 an oil water 21 communicating with the oil supply hole 20 is formed in the tip surface of the peeled tip 13. There is. A cutting curve is supplied to the cutting edge 19 from the oil/water 2I 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１１にあっては、切屑排出性を向
上させようとして、切屑排出ｉｆ４１６の断面積を増加
させると、軸心部の肉厚が薄く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。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。また、切刃の外周コーナ部に
形成された構成刃先によって、穴径が拡大するとともに
穿孔穴の内周面の面荒さが低下するという問題点があっ
た。さらに、ドリルの合金部がスチール製であるため、
台金部外周が摩耗しゃずいという問題点があった。"Problems to be Solved by the Invention" By the way, in the drill 11, when the cross-sectional area of the chip evacuation if 416 is increased in an attempt to improve the chip evacuation performance, the wall thickness of the shaft center portion becomes thinner and the rigidity is reduced. decreases. Furthermore, if the wall thickness of the shaft center portion is increased in an attempt to improve the rigidity, the cross-sectional area of the chip evacuation groove decreases, resulting in a decrease in chip evacuation performance. Therefore, there has been a problem that high-feed machining, which requires both high chip evacuation and high drill rigidity, cannot be performed. Further, there is a problem in that the built-up cutting edge formed at the outer peripheral corner of the cutting blade increases the hole diameter and reduces the surface roughness of the inner peripheral surface of the drilled hole. Furthermore, since the alloy part of the drill is made of steel,
There was a problem in that the outer periphery of the base metal part was subject to wear.
「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し
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［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２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、前記工具本体のうち、工具先端から前記
切屑排出溝の後端までの範囲の表面に、Ｔ ｉ Ｃ、Ｔ
ｉ Ｎ ＳＴ ｉ ＣＮ 、 Ａ Ｉ ２０３のうち
いずれかからなる被膜が設けられた構成とされている。"Means for Solving the Problems" This invention has been made to solve the above problems, so that 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 second plane and the second plane, the third plane facing in the opposite direction to the first plane. and the inner circumferential edge of the second plane, and the curvature of the third plane is on the first plane and the second plane, respectively. The curvature is equal to or less than the curvature of the curved surface having an arcuate cross section that touches the inner peripheral edge of the tool body, and the surface of the tool body extends from the tip of the tool to the rear end of the chip evacuation groove. , T i C, T
The structure is such that a coating made of either of iN ST i CN and A I 203 is provided.
「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
ように峻けられ、前記工具本体のうち、工具先端から前
記切屑排出溝の後端までの範囲の表面に、ＴｉＣ％Ｔ
ｉＮ ＳＴ ｉＣＮ 、 Ａ Ｉ２０３のうちいずれか
からなる被膜が設けられているから、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□し剛性を向上さけることができ、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
できる。また、切刃の外周コーナに構成刃先が形成され
るのを防止することができ、したがって、穴径が拡大す
るのを防止することができるとともに、穿孔穴の内周面
の面荒さを向上させることができる。さらに、ドリル外
周の対摩耗性を向上させ、ドリルの寿命を向上させるこ
とができるとともに、切屑排出溝を画成する壁面の摩擦
抵抗を減少させ、切屑排出性を向上させることができる
。このようなことから、高送り加工、ブツシュレス加工
、深穴加工、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 contacts the first plane and the second plane at their respective inner peripheral edges. TiC%T
Since a coating made of either iNST iCN or AI203 is provided, it is possible to increase the cross-sectional area of the chip evacuation groove and improve chip evacuation performance, while increasing the section modulus of the drill and improving its rigidity. Therefore, both the chip evacuation performance and the rigidity of the drill can be improved. In addition, it is possible to prevent the formation of a built-up cutting edge at the outer peripheral corner of the cutting edge, thereby preventing the hole diameter from expanding, and improving the surface roughness of the inner peripheral surface of the drilled hole. be able to. Furthermore, it is possible to improve the wear resistance of the outer periphery of the drill and extend the life of the drill, and it is also possible to reduce the frictional resistance of the wall surface defining the chip discharge groove and improve chip discharge performance. For this reason, high-feed machining, buttless machining, deep hole machining, and high-precision hole drilling can be performed.
「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３！を示
す図である。このドリル３１は、スチール製の台金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およびむくデツプ本体３５の外周には、周方向に等
間隔に２つの切屑排出溝３６．３６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３９との間に形成された第３の平面（第３の而
）４０とを備えている。前記第３の平面４０は、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、半径方向外方を向いて配設さ
れている。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４１，４＋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。Figures 1 to 3 show a drill 3 according to the present invention! FIG. This drill 31 has a base metal 32 made of steel.
A solid tip 33 made of cemented carbide is brazed to the tip of the tip. The base metal 32 and the peeled chip 33 are
It has a base metal body (tool body) 34 and a peeling tip body (tool body) 35 having a substantially circular cross section. Two chip discharge grooves 36 and 36 are formed at equal intervals in the circumferential direction on the outer peripheries of the base metal body 34 and the peeled tip body 35, extending from the tip of the peeled tip body 35 toward the rear of the base metal body 34. There is. The wall surface 37 defining the chip discharge groove 36 has a first plane 38 facing the direction of rotation, a second plane 39 facing the direction opposite to the direction of rotation, and a wall surface 37 between the first plane 38 and the second plane 38 . A third plane (third plane) 40 is formed between the plane 39 and the plane 39. The third plane 40 is provided between the inner circumferential edge of the first plane 38 and the inner circumferential edge of the second plane 39, and is arranged facing outward in the radial direction. ing. 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. , 4+ are formed to prevent stress concentration.
一方、前記合金本体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 alloy body 34 and the peeled tip body 35 adjacent to the chip discharge groove 36, and there is an internal space between these margins 43.43. Second chamfer surface 4 retreated toward the circumferential side
4 is formed.
また、前記マージン４３の外周囲と前記第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 periphery of the margin 43 and the second plane 39
A chamfer 45 is formed at the intersection of the two 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４８．４８が形成されている。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 body 34, and armholes 48, 48 communicating with the oil supply hole 47 are formed in the distal end surface of the peeled tip body 35. is formed.
そして、前記切刃４６に対して、前記給油孔４７を通し
て前記袖穴４８から切削油を供給するようになっている
。Cutting oil is supplied to the cutting blade 46 from the side hole 48 through the oil supply hole 47.
このようなドリルの工具先端から前記切屑排出’ｒｈＴ
３６の後端までの範囲の表面には、構成刃先の形成を
防止し、耐摩耗性および切屑排出性を向上させるために
、被膜４９か形成されている。この被膜４９は、ＴｉＣ
％Ｔ ｉＮ ＳＴ ｉＣＮ 、 Ａ ＬＯｓのうちいず
れかからなるものであって、第３図中Ａで示す範囲に設
けられている。The said chip discharge 'rhT from the tool tip of such a drill
A coating 49 is formed on the surface of the cutting edge 36 up to the rear end in order to prevent the formation of a built-up edge and improve wear resistance and chip evacuation. This coating 49 is made of TiC
%T iN ST iCN or A LOs, and is provided in the range indicated by A in FIG.
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、ドリ
ルの工具先端から前記切屑排出溝３６の後端までの範囲
の表面に、ＴｉＣ，ＴｉＮ、Ｔ１ＣＮ、ＡｌｘＯｓのう
ちいずれかからなる被膜４９が設けられているから、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剛性を向上させることが
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る。また、切刃４６の外周コーナ
に構成刃先が形成されるのを防止することができ、した
がって、穿孔穴の穴径が拡大するのを防止することがで
きるととらに、穿孔穴の内周面の面荒さを向上させるこ
とができる。さらに、ドリル外周の対摩耗性を向上させ
、ドリルの寿命を向上させることができるとともに、切
屑排出７？４３６を画成する壁面３７の摩擦抵抗を減少
させ、切屑排出性を向上させることができる。このよう
なことから、高送り加工、ブツシュレス加工、深穴加工
、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 extends from the tip of the tool of the drill to the rear end of the chip evacuation groove 36. Since the coating 49 made of one of TiC, TiN, T1CN, and AlxOs is provided on the surface of the drill, the cross-sectional area of the chip evacuation groove 36 is increased to improve chip evacuation performance and increase the section modulus of the drill. Therefore, both the chip evacuation performance and the rigidity of the drill can be improved. In addition, it is possible to prevent a built-up cutting edge from being formed at the outer peripheral corner of the cutting blade 46, and therefore, it is possible to prevent the hole diameter of the drilled hole from expanding. surface roughness can be improved. Furthermore, it is possible to improve the wear resistance of the outer periphery of the drill and extend the life of the drill, and it is also possible to reduce the frictional resistance of the wall surface 37 defining the chip discharge area 7?436 and improve chip discharge performance. . For this reason, high-feed machining, buttless machining, deep hole machining, 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（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、前記工
具本体のうち、工具先端から前記切屑排出溝の後端まで
の範囲の表面に、ＴｉＣ，ＴｉＮ 、 Ｔ ｉＣＮ 、
Ａ ｌ ２０３のうちいずれかからなる被膜が設けら
れているから、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、また穴径が拡大するのを防止する
ことができるとともに穿孔穴の内周面の面荒さを向上さ
せることができ、さらにドリル外周の対摩耗性を向上さ
せることができ、切屑排出性を向上さけることができ、
したがって高送り加工、ブツシュレス加工、深穴加工、
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 direction opposite to the rotation direction. a flat surface; and a third surface provided between the first flat surface and the second flat surface, and the third surface is arranged between an inner circumferential edge of the first flat surface and the third surface. a cross-sectional circle provided between the inner circumferential edge of the second plane and the curvature of the third plane touching the first plane and the second plane at their respective inner circumferential edges; The curvature is equal to or less than the curvature of the arc-shaped curved surface, and TiC, TiN, TiCN,
Since a coating made of one of Al 203 is provided, it is possible to improve both the chip evacuation performance and the rigidity of the drill, and it is also possible to prevent the hole diameter from expanding and to improve the diameter of the drilled hole. It is possible to improve the surface roughness of the inner circumferential surface, and also to improve the wear resistance of the outer circumference of the drill, and to avoid improving chip evacuation.
Therefore, high feed machining, buttless machining, deep hole machining,
High-precision drilling provides the advantage of being able to perform machining.
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Ｉ−■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の而）、
４９・・・・・・被膜、５１，５２．５３・・・・・・
曲面（第３の面）。1 to 3 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a sectional view taken along the arrow I-■ line in FIG.
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 (
35... Peeling tip body (tool body), 36... Chip discharge groove, 37... Wall surface, 38... First plane, 39... second plane, 40... third plane (third plane),
49...Coating, 51,52.53...
Curved surface (third surface).
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、前記工具本体のうち、工具先端から前記
切屑排出溝の後端までの範囲の表面に、ＴｉＣ、ＴｉＮ
、ＴｉＣＮ、Ａｌ＿２Ｏ＿３のうちいずれかからなる被
膜が設けら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 curvature is equal to or less than the curvature of the curved surface having an arcuate cross section that touches the inner edge of each of the grooves, and the area of the tool body from the tip of the tool to the rear end of the chip evacuation groove. TiC, TiN on the surface
, TiCN, and Al_2O_3.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62076803A JPS63245311A (en) | 1987-03-30 | 1987-03-30 | Drill |
| KR1019880000405A KR940011176B1 (en) | 1987-03-04 | 1988-01-20 | Drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62076803A JPS63245311A (en) | 1987-03-30 | 1987-03-30 | Drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63245311A true JPS63245311A (en) | 1988-10-12 |
Family
ID=13615810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62076803A Pending JPS63245311A (en) | 1987-03-04 | 1987-03-30 | Drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63245311A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5967707A (en) * | 1998-07-29 | 1999-10-19 | Diesel Technology Company | Short-hole drill bit |
| JP2002536194A (en) * | 1999-02-11 | 2002-10-29 | ケンナメタル インコーポレイテッド | Method of making cutting tool and cutting tool |
| JP2020025996A (en) * | 2018-08-09 | 2020-02-20 | マコトロイ工業株式会社 | Drill |
-
1987
- 1987-03-30 JP JP62076803A patent/JPS63245311A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5967707A (en) * | 1998-07-29 | 1999-10-19 | Diesel Technology Company | Short-hole drill bit |
| JP2002536194A (en) * | 1999-02-11 | 2002-10-29 | ケンナメタル インコーポレイテッド | Method of making cutting tool and cutting tool |
| JP4680392B2 (en) * | 1999-02-11 | 2011-05-11 | ケンナメタル インコーポレイテッド | How to create a cutting tool |
| JP2020025996A (en) * | 2018-08-09 | 2020-02-20 | マコトロイ工業株式会社 | Drill |
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