JPS63127804A - Drill - Google Patents
DrillInfo
- Publication number
- JPS63127804A JPS63127804A JP27152786A JP27152786A JPS63127804A JP S63127804 A JPS63127804 A JP S63127804A JP 27152786 A JP27152786 A JP 27152786A JP 27152786 A JP27152786 A JP 27152786A JP S63127804 A JPS63127804 A JP S63127804A
- Authority
- JP
- Japan
- Prior art keywords
- small
- cutting edge
- large diameter
- sintered body
- small diameter
- 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
- 238000005520 cutting process Methods 0.000 claims abstract description 69
- 229910003460 diamond Inorganic materials 0.000 abstract description 7
- 239000010432 diamond Substances 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 238000005219 brazing Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000004070 electrodeposition Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000011195 cermet Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000010959 steel Substances 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
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003466 welding 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、先端に小径部を有しこの小径部の後部に大
径部を有する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 having a small diameter section at the tip and a large diameter section at the rear of the small diameter section.
「従来の技術」
従来、切刃部に超高圧焼結体がろう付けされたドリルと
しては、第６図および第７図に示すようなドリル１１お
よび１３が知られている。前記ドリル１１は、工具本体
１５の先端部に、その先端中心から半径方向外方に向か
うにしたがい後方へ傾斜した切刃１７が形成されてなる
ものであって、前記切刃１７の後半部および工具本体１
５の外周部のうち前記切刃１７−の外周側端縁に隣接す
る部分を超高圧焼結体１９で構成し、この超高圧焼結体
１９を前記工具本体１５にろう付は固定したものである
。"Prior Art" Drills 11 and 13 as shown in FIGS. 6 and 7 are conventionally known as drills whose cutting edges are brazed with an ultra-high pressure sintered body. The drill 11 has a cutting edge 17 formed at the tip of a tool body 15, which is inclined rearward from the center of the tip toward the outside in the radial direction. Tool body 1
5, a portion adjacent to the outer peripheral edge of the cutting blade 17- is made of an ultra-high pressure sintered body 19, and this ultra-high pressure sintered body 19 is fixed to the tool body 15 by brazing. It is.
また、前記ドリル１３は、前記超高圧焼結体１９が切刃
の内周側端縁にまで及んでいろ点を除いて、前記ドリル
１１と同様の構成になされている。Further, the drill 13 has the same structure as the drill 11, except that the ultra-high pressure sintered body 19 extends to the inner peripheral edge of the cutting blade.
「発明が解決しようとする問題点」
ところで、上記ドリル１１および１３にあっては、切刃
１７上の工具本体１５と超高圧焼結体１９との間のろう
付は部分Ａが浸食される。このため、切削中の溶着によ
る切屑づまりや浸食過多による超高圧焼結体の剥離が発
生し、ドリルの破損をまねくという問題点があった。"Problems to be Solved by the Invention" By the way, in the drills 11 and 13, part A of the brazing between the tool body 15 on the cutting edge 17 and the ultra-high pressure sintered body 19 is eroded. . For this reason, there is a problem in that the ultra-high pressure sintered body is peeled off due to clogging of chips due to welding during cutting and due to excessive erosion, leading to damage to the drill.
「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ｆこ
らので、小径部とこの小径部の後端に設：すられ前記小
径部と同軸の大径部とを有した工具本体を備え、この工
具本体の先端から後端方向に向って切屑排出溝が設けら
れ、この切屑排出溝の回転方向を向く壁面の前記小径部
の先端部に、前記小径部の軸心部から前記小径部の外周
に至る小径部切刃が設けられ、前記切屑排出溝の回転方
向を向く壁面の前記小径部と前記大径部との間には、前
記小径部の外周部から前記大径部の外周に至る大径部切
刃が設けられ、前記大径部切刃の刃先部分を超高圧焼結
体で構成している。"Means for Solving the Problems" The present invention has been made in order to solve the above problems.Therefore, a small diameter part and a large diameter part coaxial with the small diameter part are provided at the rear end of the small diameter part. A chip discharge groove is provided from the tip of the tool body toward the rear end, and a chip discharge groove is provided at the tip of the small diameter portion of the wall surface facing the rotation direction of the chip discharge groove. A small diameter cutting edge extending from the axial center of the part to the outer periphery of the small diameter part is provided between the small diameter part and the large diameter part of the wall surface facing the rotation direction of the chip evacuation groove. A large diameter cutting blade is provided extending from the outer circumference to the outer periphery of the large diameter part, and the cutting edge portion of the large diameter cutting blade is made of an ultra-high pressure sintered body.
「実施例」
以下、この発明の一実施例について第１図および第２図
を参照して説明する。"Embodiment" An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
第１図：ま、この発明に係るドリル２１を示す図である
。このドリル２１は、ドリル本体２３の先端に切刃チッ
プ本体（工具本体）２５を備えている。FIG. 1: This is a diagram showing a drill 21 according to the present invention. This drill 21 includes a cutting tip body (tool body) 25 at the tip of a drill body 23.
この切刃デツプ本体２５は、超硬合金、サーメット、ス
チール等から構成され、小径部２７とこの小径部２７の
後端に設けられｉコ記小径部２７と同軸の大径部２９と
を有している。前記切刃チップ本体２５の外周には、先
端から後端方向に向って切屑排出溝３１が設けられてい
る。The cutting edge body 25 is made of cemented carbide, cermet, steel, etc., and has a small diameter portion 27 and a large diameter portion 29 provided at the rear end of the small diameter portion 27 and coaxial with the small diameter portion 27. are doing. A chip discharge groove 31 is provided on the outer periphery of the cutting tip body 25 from the tip toward the rear end.
この切屑排出１Ｍ３１の回転方向を向く壁面の前記小径
部２７の先端部−には、前記小径部２７の軸心部から前
記小径部２７の外周に至る小径部切刃３３が設けられて
いる。また、前記切屑排出溝３１の回転方向を向く壁面
の前記小径部２７と前記大径部２９との間には、大径部
切刃３５が設けられている。この大径部切刃３５は、前
記小径部２７の外周部から面記犬径部２９の外周まて半
径方向外方に向かうにしたがい後方へ傾斜して形成され
ている。そして、前記大径部切刃３５の刃先部分の全部
と前記大径部２９の外周部のうち前記大径部切刃３５の
外周側端縁に隣接する部分とは、超高圧焼結体３７て構
成されている。この超高圧焼結体３７は、ダイヤモンド
焼結体ないしはＣＢＳ焼結体であり、前記切刃チップ本
体２５にろう付は固定されている。A small-diameter cutting blade 33 extending from the axial center of the small-diameter portion 27 to the outer periphery of the small-diameter portion 27 is provided at the tip of the small-diameter portion 27 on the wall surface facing the rotational direction of the chip discharger 1M31. Further, a large-diameter cutting blade 35 is provided between the small-diameter portion 27 and the large-diameter portion 29 on the wall surface of the chip discharge groove 31 facing the rotation direction. The large-diameter cutting edge 35 is formed to be inclined rearward from the outer circumference of the small-diameter portion 27 to the outer circumference of the dog-diameter portion 29 as it goes radially outward. The entire cutting edge portion of the large-diameter cutting blade 35 and the portion of the outer peripheral portion of the large-diameter portion 29 adjacent to the outer peripheral edge of the large-diameter cutting blade 35 are the ultra-high pressure sintered body 37. It is composed of The ultra-high pressure sintered body 37 is a diamond sintered body or a CBS sintered body, and is fixed to the cutting tip body 25 by brazing.
このように、このドリル２１にあっては、切刃チップ本
体２５に小径部２７と大径部２９とを設け、前記小径部
２７と前記大径部２９との間に大径部切刃３５を設け、
この大径部切刃３５の刃先全部を超高圧焼結体で構成し
ているから、超高圧焼結体３７と切刃デツプ本体２５と
のろう付は部の浸食を防止することができ、したかって
ドリルの破損を防止することができる。In this way, in this drill 21, the cutting blade tip body 25 is provided with a small diameter part 27 and a large diameter part 29, and a large diameter part cutting blade 35 is provided between the small diameter part 27 and the large diameter part 29. established,
Since the entire cutting edge of the large-diameter cutting blade 35 is made of an ultra-high pressure sintered body, the brazing between the ultra-high pressure sintered body 37 and the cutting blade depth body 25 can prevent corrosion of the part. This can prevent damage to the drill.
また、大径部切刃３５を超高圧焼結体で構成しているか
ら、大径部切刃３５による加工面の面粗度および加工穴
精度を向上させることができ、ラッピング加工やリーミ
ング加工を必要とせず加工工程を短縮することができる
。In addition, since the large diameter cutting blade 35 is made of an ultra-high pressure sintered body, the surface roughness of the machined surface and the precision of the hole machined by the large diameter cutting blade 35 can be improved, and it is possible to perform lapping and reaming processes. The machining process can be shortened without the need for
さらに、小径部２７に小径部切刃３３を設けるとともに
、大径部２９に大径部切刃３５を設けているから、前記
小径部２７がガイドとなり、ブッソユレス加工を行うこ
とができ、５Ｄ以上の深穴加工が可能となる。Furthermore, since the small diameter part 27 is provided with a small diameter cutting blade 33 and the large diameter part 29 is provided with a large diameter part cutting blade 35, the small diameter part 27 serves as a guide and it is possible to perform busho-yuresu machining, and it is possible to perform 5D or more. Enables deep hole machining.
次に、第２図は、本発明に係る他の実施例であるドリル
４１を示すものである。このドリル４１は、工具本体４
３を備えている。この工具本体４３は、超硬合金、サー
メット、スチール等から構成され、小径部４５とこの小
径部４５の後端に設けられ前記小径部４５と同軸の大径
部４７とを有している。また、前記工具本体４３の外周
には、先端から後端方向に向−って切屑排出溝４９が設
けられている。Next, FIG. 2 shows a drill 41 which is another embodiment of the present invention. This drill 41 has a tool body 4
It has 3. The tool body 43 is made of cemented carbide, cermet, steel, etc., and has a small diameter portion 45 and a large diameter portion 47 provided at the rear end of the small diameter portion 45 and coaxial with the small diameter portion 45 . Further, a chip discharge groove 49 is provided on the outer periphery of the tool body 43 from the tip toward the rear end.
この切屑排出溝４９の回転方向を向く壁面の前記小径部
４５の先端部には、前記小径部４５の軸心部から前記小
径部４５の外周に至る小径部切刃５１が設けられている
。そして、前記小径部４５の表面には、硬質被膜５３が
形成されている。この硬質被膜５３は、ダイヤモンドあ
るいはＣＢＮ電着（０，１μ〜５００μ粒子）によるも
の、あるいはＰＶＤ法によりＴｉＣ，ＴｉＮ５ＴｉＣＮ
、Ｄ ＩＡ 、 Ａ ｌｙｏ ３等をコーティングした
ものである。A small-diameter cutting edge 51 extending from the axial center of the small-diameter portion 45 to the outer periphery of the small-diameter portion 45 is provided at the tip of the small-diameter portion 45 on the wall surface of the chip discharge groove 49 facing the rotation direction. A hard coating 53 is formed on the surface of the small diameter portion 45. This hard coating 53 is formed by electrodeposition of diamond or CBN (0.1μ to 500μ particles), or by PVD method using TiC, TiN5TiCN.
, DIA, Alyo 3, etc.
また、前記切屑排出溝４９の回転方向を向く壁面の前記
小径部４５と前記大径部１７との間には、大径部切刃５
５が設けられている。この大径部切刃５５は、前記小径
部４５の外周部から前記大径部４７の外周まで半径方向
外方に向かうにしたがい後方へ傾斜して形成されている
。そして、面記大径部切刃５５の刃先全部と前記大径部
４７の外周部のうち前記大径部切刃５５の外周側端縁に
隣接する部分とは、ダイヤモンドあるいはＣＢＨの超高
圧焼結体５７で構成されている。この超高圧焼結体５７
は、前記工具本体４３にろう付は固定されている。Further, between the small diameter portion 45 and the large diameter portion 17 of the wall surface facing the rotation direction of the chip discharge groove 49, a large diameter cutting edge 5 is provided.
5 is provided. The large diameter cutting edge 55 is formed to be inclined rearward as it goes radially outward from the outer periphery of the small diameter part 45 to the outer periphery of the large diameter part 47 . The entire cutting edge of the large-diameter cutting blade 55 and the portion of the outer periphery of the large-diameter portion 47 adjacent to the outer peripheral edge of the large-diameter cutting blade 55 are made of ultra-high-pressure sintered diamond or CBH. It is composed of a body 57. This ultra-high pressure sintered body 57
is fixed to the tool body 43 by brazing.
ここて、面記硬質披膜５３の材質と前記超高圧焼結体５
７の材質との組み合わけは以下のようにするのか望まし
い。すなわち、被削材が超硬合金（予焼段階）、アルミ
ニウム合金、セラミック（予焼段階）、カーボン、カッ
パー、プラスデック、ＰＲＰ等の場合には、前記超高圧
焼結体５７をダイヤモンド焼結体とするとともに、前記
硬質被膜５３をダイヤモンド電着またはＰＶＤ法による
コーティングとする。また、被削材が高硬度材、焼結合
金（予焼段階のものと焼きの入った乙の両方）等の場合
には、前記超高圧焼結体５７をＣｎＮ焼結体とし、市１
記硬質彼膜５３をＣＢ Ｎ ７ｔａ着ま１０よＰＶＤ法
によるコーティングとする。Here, the material of the surface hard arytenoid 53 and the ultra-high pressure sintered body 5
It is preferable to combine materials No. 7 as follows. That is, when the workpiece material is cemented carbide (pre-fired stage), aluminum alloy, ceramic (pre-fired stage), carbon, copper, Plus Deck, PRP, etc., the ultra-high pressure sintered body 57 is diamond sintered. In addition, the hard coating 53 is coated by diamond electrodeposition or PVD. In addition, when the work material is a high-hardness material, a sintered alloy (both pre-fired and sintered), the ultra-high pressure sintered body 57 is a CnN sintered body, and the
The hard membrane 53 is coated with CBN7TA10 using the PVD method.
このように、このドリル４１にあっては、小径部４５と
大径部４７を設け、前記小径部４５に小径部切刃５１を
設けるとともに、大径部４７に大径部切刃５５を設けて
いるから、前記小径部、１５がガイドとなり、した−か
ってブツシュレス加工を行うことができろ。In this way, this drill 41 is provided with a small diameter portion 45 and a large diameter portion 47, the small diameter portion 45 is provided with a small diameter cutting blade 51, and the large diameter portion 47 is provided with a large diameter cutting blade 55. Therefore, the small diameter portion 15 serves as a guide, making it possible to perform the buttless processing.
ところで、前記ドリル４１と類似したドリルとしては、
従来、第３図に示すようなセンタードリル６１が知られ
ている。このドリル６１は、超硬合金、サーメットまた
はスヂールから構成され、小径部６３と大径部６５とを
備えており、前記小径部６３の先端部に小径部切刃６７
が設けられるとともに、前記小径部６３と前記大径部６
５との間に大径部切刃６９が設けられてなろらのである
。By the way, drills similar to the drill 41 are:
Conventionally, a center drill 61 as shown in FIG. 3 is known. This drill 61 is made of cemented carbide, cermet, or sudil, and has a small diameter part 63 and a large diameter part 65, and a small diameter cutting edge 67 at the tip of the small diameter part 63.
is provided, and the small diameter portion 63 and the large diameter portion 6
A large diameter cutting edge 69 is provided between the cutting edge 5 and the cutting edge 69.
ところが、このセンタードリル６１は、被削材が超硬合
金（予焼段階）、セラミック（予焼段階）、焼結合金（
予焼段階のものと焼きが入ったもの両方）等の難削材の
場合には、工具寿命およびワーク面粗度か非常に悪い。However, in this center drill 61, the workpiece materials are cemented carbide (pre-fired stage), ceramic (pre-fired stage), and sintered alloy (
In the case of difficult-to-cut materials such as those in the pre-burning stage and those that are hardened, the tool life and workpiece surface roughness are very poor.
このため、第４図に示すような、前記センタートリル６
Ｉの表面にダイヤモンド電着、ＣＢＮ電着、あるいはコ
ーティングによる硬質被膜７１を設けたセンタードリル
７３が開発された。For this reason, the center trill 6 as shown in FIG.
A center drill 73 has been developed in which a hard coating 71 is provided on the surface of the I by diamond electrodeposition, CBN electrodeposition, or coating.
しかしながら、このセンタードリル７３にあっては、セ
ンタードリル６１に比して幾分工具寿命が向上したもの
の、未だ充分とはいえなかった。However, although the center drill 73 had a somewhat improved tool life compared to the center drill 61, it was still not sufficient.
また、大径部切刃６９による第５図に示すような円錐状
加工面８１に、電着の場合その砥石のスジ残りによるダ
メージ層が生じ、前記円錐加工面８１の面粗度および精
度が非常に悪い。このため、ラッピング加工もしくはり
−ミング加工が必要となり、加工工程が増加するという
欠点があった。Further, in the case of electrodeposition, a damaged layer due to residual streaks of the grinding wheel is generated on the conical machined surface 81 as shown in FIG. Very bad. For this reason, lapping or laminating is required, which has the disadvantage of increasing the number of processing steps.
これに対して、本実施例のドリル４１にあっては、前記
小径部４５と前記大径部４７との間の大径部切刃５５を
超高圧焼結体で構成しているから、大径部切刃５５によ
る加工面の面粗度および加工穴精度を向上させることが
でき、ラッピング加工やリーミング加工を必要と仕ず加
工工程を短縮することができる。On the other hand, in the drill 41 of this embodiment, the large diameter cutting edge 55 between the small diameter part 45 and the large diameter part 47 is made of an ultra-high pressure sintered body. The surface roughness of the machined surface and the precision of the machined hole by the diameter cutting edge 55 can be improved, and the machining process can be shortened without requiring lapping or reaming.
また、小径部４５に硬質被膜５３を設けているから、難
削材の加工が可能になるとともに、前記大径部切刃５５
が超高圧焼結体から構成されていることと相俟って、工
具寿命を向上させることができる。Further, since the hard coating 53 is provided on the small diameter portion 45, it is possible to process difficult-to-cut materials, and the large diameter portion cutting edge 55
Coupled with the fact that the tool is made of an ultra-high pressure sintered body, the tool life can be improved.
なお、上記実施例に−おいては、小径部切刃および大径
部切刃がそれぞれ１枚形成されたドリルについて記述さ
れているが、これに限る必要はなく、小径部切刃および
大径部切刃がそれぞれ２枚以上形成されたドリルであっ
てもよい。Although the above embodiment describes a drill in which one small diameter cutting edge and one large diameter cutting edge are formed, the drill is not limited to this, and the small diameter cutting edge and the large diameter cutting edge are The drill may have two or more partial cutting edges.
「発明の効果」
以上に説明したように、この発明によれば、小径部とこ
の小径部の後端に設けられ前記小径部と同軸の大径部と
を有した工具本体を備え、この工具本体の先端から後端
方向に向って切屑排出１背が設けられ、この切屑排出溝
の回転方向を向く壁面の前記小径部の先端部に、前記小
径部の軸心部から前記小径部の外周に至る小径部切刃が
設けられ、前記切屑排出溝の回転方向を向く壁面の前記
小径部と前記大径部との間には、前記小径部の外周部か
ら前記大径部の外周に至る大径部切刃が設けられ、前記
大径部切刃の刃先部分を超高圧焼結体で構成しているか
ら、超高圧焼結体と工具本体のろう付は部の浸食を防止
することができるとともに、大径部切刃による加工面の
面粗度および加工穴精度を向上させることができ、ラッ
ピング加工やリーミング加工を必要とせず工程を短縮す
ることができ、さらに、小径部がガイドとなるため、ブ
ッンユレス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 tool includes a tool body having a small diameter part and a large diameter part provided at the rear end of the small diameter part and coaxial with the small diameter part. A chip evacuation plate 1 is provided from the tip of the main body toward the rear end, and at the tip of the small diameter portion of the wall facing the rotation direction of the chip ejection groove, there is a back plate extending from the axis of the small diameter portion to the outer circumference of the small diameter portion. A small-diameter cutting edge extending from the outer periphery of the small-diameter portion to the outer periphery of the large-diameter portion is provided between the small-diameter portion and the large-diameter portion of the wall surface facing the rotation direction of the chip discharge groove. Since a large-diameter cutting blade is provided and the cutting edge of the large-diameter cutting blade is made of an ultra-high pressure sintered body, brazing the ultra-high-pressure sintered body and the tool body prevents erosion of the part. In addition, it is possible to improve the surface roughness of the machined surface and the accuracy of the machined hole by the large diameter cutting edge, and the process can be shortened without the need for lapping or reaming. Therefore, it is possible to obtain the effect of being able to perform the bunyuresu processing.
第１図は本発明の一実施例を示す側面図、第２図は本発
明の他の実施例を示す側面図、第３図は第２図に示すド
リルに類似する従来のセンタードリルの一例を示す側面
図、第４図は第２図に示すドリルに類似する従来のセン
タードリルの他の例を示す側面図、第５図は第４図に示
すセンタードリルで切削を行った加工穴を示す断面図、
第６図は従来のドリルの一例を示す側面図、第７図は従
来のドリルの他の一例を示す側面図である。
２１・・・・・・ドリル、２５・・・・・・切刃チップ
本体（工具本体）、２７・・・・・小径部、２９・・・
・・・大径部、３１・・・・・・切屑排出ｉ’ｌ、！、
３３・・・・・・小径部切刃、３５・・・・・・大径部
切刃、３７・・・・・・超高圧焼結体、４１・・・・・
・ドリル、４３・・・・・・工具本体、４５・・・・・
・小径部、４７・・・・・大径部、４９・・・・・・切
屑排出溝、５１・・・・・・小径部切刃、５５・・・・
・・大径部切刃、５７・・・・・超高圧焼結体、Fig. 1 is a side view showing one embodiment of the present invention, Fig. 2 is a side view showing another embodiment of the invention, and Fig. 3 is an example of a conventional center drill similar to the drill shown in Fig. 2. FIG. 4 is a side view showing another example of a conventional center drill similar to the drill shown in FIG. 2, and FIG. 5 is a side view showing a hole cut with the center drill shown in FIG. A cross-sectional view showing,
FIG. 6 is a side view showing an example of a conventional drill, and FIG. 7 is a side view showing another example of the conventional drill. 21... Drill, 25... Cutting tip body (tool body), 27... Small diameter part, 29...
...Large diameter section, 31...Chip discharge i'l,! ,
33... Small diameter cutting edge, 35... Large diameter cutting edge, 37... Ultra high pressure sintered body, 41...
・Drill, 43... Tool body, 45...
・Small diameter section, 47...Large diameter section, 49...Chip discharge groove, 51...Small diameter section cutting edge, 55...
...Large diameter cutting edge, 57...Ultra high pressure sintered body,
Claims (1)
の大径部とを有した工具本体を備え、この工具本体の先
端から後端方向に向って切屑排出溝が設けられ、この切
屑排出溝の回転方向を向く壁面の前記小径部の先端部に
、前記小径部の軸心部から前記小径部の外周に至る小径
部切刃が設けられ、前記切屑排出溝の回転方向を向く壁
面の前記小径部と前記大径部との間には、前記小径部の
外周部から前記大径部の外周に至る大径部切刃が設けら
れ、前記大径部切刃の刃先部分を超高圧焼結体で構成し
たことを特徴とするドリル。The tool body has a small diameter part and a large diameter part provided at the rear end of the small diameter part and coaxial with the small diameter part, and a chip discharge groove is provided from the tip of the tool body toward the rear end. A small-diameter cutting edge extending from an axial center of the small-diameter portion to an outer periphery of the small-diameter portion is provided at the tip of the small-diameter portion of the wall surface facing the rotation direction of the chip discharge groove, and facing the rotation direction of the chip discharge groove. A large diameter cutting blade is provided between the small diameter part and the large diameter part of the wall surface, and extends from the outer periphery of the small diameter part to the outer periphery of the large diameter part. A drill characterized by being constructed from an ultra-high pressure sintered body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27152786A JPS63127804A (en) | 1986-11-14 | 1986-11-14 | Drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27152786A JPS63127804A (en) | 1986-11-14 | 1986-11-14 | Drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63127804A true JPS63127804A (en) | 1988-05-31 |
Family
ID=17501306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27152786A Pending JPS63127804A (en) | 1986-11-14 | 1986-11-14 | Drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63127804A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354155A (en) * | 1993-11-23 | 1994-10-11 | Storage Technology Corporation | Drill and reamer for composite material |
-
1986
- 1986-11-14 JP JP27152786A patent/JPS63127804A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354155A (en) * | 1993-11-23 | 1994-10-11 | Storage Technology Corporation | Drill and reamer for composite material |
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