JPH054106A - Throw away type drill - Google Patents
Throw away type drillInfo
- Publication number
- JPH054106A JPH054106A JP18290491A JP18290491A JPH054106A JP H054106 A JPH054106 A JP H054106A JP 18290491 A JP18290491 A JP 18290491A JP 18290491 A JP18290491 A JP 18290491A JP H054106 A JPH054106 A JP H054106A
- Authority
- JP
- Japan
- Prior art keywords
- blade tip
- tip
- outer peripheral
- center
- cutting
- 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
(57)【要約】 （修正有）
【目的】 加工穴精度および切屑排出性を向上する。
【構成】 フルート溝２，３の先端に設けられたチップ
座４，５内に、等辺６角形板状からなる中心刃チップ６
および外周刃チップ７を設ける。中心刃チップ６および
外周刃チップ７は、１つおきの頂角が等しくなるよう
に、その隣合せの頂角に大小関係を付与したものであ
り、大きな頂角部分に構成された切刃稜６ａ，７ａが径
方向等しく振分けられた取付け角αによって設定され
る。また、ドリル本体１の端面視方向では、中心刃チッ
プ６の切刃稜６ａが基準直径線に対して平行な芯下り状
態にする。外周刃チップ７の切刃稜７ａは、基準直径線
に対して平行な芯上り状態にする。
(57) [Summary] (Corrected) [Purpose] To improve the accuracy of machined holes and chip discharge. [Structure] A center blade tip 6 having an equilateral hexagonal plate shape is provided in tip seats 4 and 5 provided at the tips of the flute grooves 2 and 3.
And a peripheral blade tip 7 is provided. The center blade tip 6 and the peripheral blade tip 7 are provided with a magnitude relationship between adjacent apex angles so that every other apex angle is the same, and a cutting edge ridge formed in a large apex angle portion. 6a and 7a are set by the mounting angle α equally distributed in the radial direction. Further, in the end surface view direction of the drill body 1, the cutting edge 6a of the central cutting tip 6 is in a center-down state parallel to the reference diameter line. The cutting edge 7a of the outer peripheral edge tip 7 is in a center-up state parallel to the reference diameter line.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、中心刃チップおよび外
周刃チップを備えたスローアウェイ式ドリルに関し、特
に、切削性能が向上するように改善したものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away type drill having a center blade tip and an outer peripheral blade tip, and more particularly, it has been improved so as to improve cutting performance.
【０００２】[0002]
【従来の技術】従来、この種のスローアウェイ式ドリル
としては、例えば特公昭６１−２１７６６号公報に開示
されているものがある。そして、このスローアウェイ式
ドリルは、特殊な等辺６角形チップからなる中心刃チッ
プおよび外周刃チップを備えるとともに、このチップの
刃先が円周方向において、ほぼ同一方向の角度間隔の半
径線上に位置し、さらに工具本体の軸線から半径方向異
なるところに位置するように配置されているものであ
る。2. Description of the Related Art Conventionally, as a throw-away type drill of this type, for example, there is one disclosed in Japanese Patent Publication No. 61-21766. Further, this throw-away drill is provided with a center blade tip and an outer peripheral blade tip made of special equilateral hexagonal tips, and the tips of the tips are positioned in the circumferential direction on radial lines at angular intervals in substantially the same direction. Further, it is arranged so as to be located at a position different from the axis of the tool body in the radial direction.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前述し
た公報にみられるスローアウェイ式ドリルは、各刃先が
被削材に対して同時喰付きとなるため、外周刃チップの
切削負担が大きくなり、加工穴の精度が低下するという
問題点があった。そして、この傾向は、穴深さが深くな
ると顕著になり、また、被削材の加工面が傾斜している
場合には、外周刃から喰付くため、さらに、加工穴の精
度を低下させるものであった。However, in the throw-away type drill found in the above-mentioned publication, since each cutting edge simultaneously bites against the work material, the cutting load of the outer peripheral blade tip increases, and There was a problem that the accuracy of the hole was reduced. And, this tendency becomes remarkable as the depth of the hole becomes deeper, and when the machined surface of the work material is inclined, it bites from the outer peripheral blade, further reducing the accuracy of the machined hole. Met.
【０００４】このようなことから、本発明では、中心刃
チップおよび外周刃チップの切刃構成および切削負担を
改善することにより、加工穴精度および切屑排出性の向
上を図ったものである。In view of the above, the present invention is intended to improve the accuracy of machined holes and the chip discharging property by improving the cutting blade configuration and cutting load of the center blade tip and the outer peripheral blade tip.
【０００５】[0005]
【課題を解決するための手段】本発明は、上述の点に鑑
みなされたもので、等辺６角形板からなる中心刃チップ
および外周刃チップは、ドリル本体の端面視方向では、
中心刃チップの切刃稜が基準直径線に対して平行な芯下
り状態にあるとともに、約１８０°離れた位置関係にあ
る外周刃チップの切刃稜が前記基準直径線に対して平行
な芯上り状態にあるようにしたものである。また、切削
による回転軌跡では、前記中心刃チップが外周刃チップ
に対して軸方向で先行するとともに、径方向で切削負担
幅が大きくなるようにしたものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a center blade tip and an outer peripheral blade tip made of an equilateral hexagonal plate are
The cutting edge of the central cutting edge is parallel to the reference diameter line, and the cutting edge of the outer circumferential cutting edge in a positional relationship about 180 ° apart is parallel to the reference diameter line. It is designed to be in an up state. Further, in the rotation locus due to cutting, the central blade tip precedes the outer peripheral blade tip in the axial direction, and the cutting load width increases in the radial direction.
【０００６】[0006]
【作用】本発明のスローアウェイ式ドリルは、中心刃チ
ップが先行して切削に関与するため、喰付き時の歩行現
象が小さくなるように作用する。In the throw-away type drill of the present invention, since the central blade tip is involved in the cutting in advance, it acts so as to reduce the walking phenomenon at the time of biting.
【０００７】また、中心刃チップは、その切削負担幅が
外周刃チップよりも大きくなっていることから、外周刃
チップの負担が軽減され、加工穴精度を向上させる。Further, since the width of cutting load of the center blade tip is larger than that of the outer peripheral blade tip, the load of the outer peripheral blade tip is reduced and the precision of the drilled hole is improved.
【０００８】さらに、外周刃チップを芯上り状態に配置
することにより、その半径方向のすくい角βが負角とな
って、切屑の排出方向を外周側に向け、切屑排出を良好
にしている。Furthermore, by arranging the outer peripheral blade tip in the center-up state, the rake angle β in the radial direction becomes a negative angle, and the chip discharge direction is directed to the outer peripheral side, and the chip discharge is improved.
【０００９】[0009]
【実施例】以下、本発明スローアウェイ式ドリルにおけ
る一実施例について、図を参照しながら説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the throw-away type drill of the present invention will be described below with reference to the drawings.
【００１０】図１および図２において、１は円柱状をな
すドリル本体であり、フルート溝２，３の先端に設けら
れたチップ座４，５内には、同一形状からなる等辺６角
形板状の中心刃チップ６および外周刃チップ７がそれぞ
れ取り付けられるようになっている。そして、中心刃チ
ップ６および外周刃チップ７は、１つおきの頂角が等し
くなるように、その隣合せの頂角に大小関係を付与した
ものであり、大きな頂角例えば１６０°を有する部分で
切刃稜６ａ，７ａが構成される。この場合、切刃稜６
ａ，７ａは、径方向を基準にした時略等しい取付け角α
で振分けられるように位置する。例えば頂角が１６０°
であれば取付け角αは、α＝１０°に設定される。In FIG. 1 and FIG. 2, reference numeral 1 is a cylindrical drill body, and equilateral hexagonal plate shapes of the same shape are provided in tip seats 4 and 5 provided at the tips of the flute grooves 2 and 3. The center blade tip 6 and the outer peripheral blade tip 7 are each attached. The central blade tip 6 and the outer peripheral blade tip 7 are those in which the adjacent vertical angles are given a magnitude relationship so that every other vertical angle is equal, and a portion having a large vertical angle, for example, 160 °. The cutting edge 6a, 7a is constituted by. In this case, the cutting edge 6
a and 7a are substantially the same mounting angle α when the radial direction is used as a reference.
It is located so that it can be distributed by. For example, the apex angle is 160 °
Then, the mounting angle α is set to α = 10 °.
【００１１】また、中心刃チップ６および外周刃チップ
７は、図２で示されるように、ドリル本体１の端面視方
向では、中心刃チップ６の切刃稜６ａが基準直径線８に
対して平行な芯下り状態にあるとともに、約１８０°離
れた位置関係にある外周刃チップ７の切刃稜７ａが前記
基準線８に対して平行な芯上り状態にあるものである。
そして、中心刃チップ６の切刃稜６ａの芯下り量δ
1は、通常δ1＝０．１〜０．２ｍｍ程度に設定される。
また、外周刃チップ７の切刃稜７ａを芯上り状態とした
のは、半径方向のすくい角βを負角例えばβ＝−４°に
設定することにより、切屑の排出を外周側に向け切屑の
排出を良好にする配慮である。Further, as shown in FIG. 2, the center blade tip 6 and the outer peripheral blade tip 7 have a cutting edge 6a of the center blade tip 6 with respect to the reference diameter line 8 in the end face view direction of the drill body 1. The cutting edge ridges 7a of the outer circumferential blade tip 7 which are in a parallel center-down state and in a positional relationship of about 180 ° apart are in a center-up state parallel to the reference line 8.
Then, the amount of centering down δ of the cutting edge 6a of the central blade tip 6
1 is usually set to about δ 1 = 0.1 to 0.2 mm.
Further, the cutting edge 7a of the outer peripheral blade tip 7 is set in the center-up state because the rake angle β in the radial direction is set to a negative angle, for example, β = −4 °, so that chips are discharged toward the outer peripheral side. It is a consideration to improve the discharge of.
【００１２】さらに、中心刃チップ６および外周刃チッ
プ７は、被削材９の切削における回転軌跡では、前記中
心刃チップ６が外周刃チップ７に対して先行するととも
に、径方向における中心刃チップ６の切削負担幅Ａを外
周刃チップ７の切削負担幅Ｂよりも大きくしているもの
である。前述した中心刃チップ６の先行量δ2は通常δ2
＝０．２〜０．３ｍｍ程度に設定される。切削負担幅
Ａ，Ｂについて、Ａ＞Ｂとしたのは、外周刃チップ７の
負担を軽減させる配慮である。これは、同じ負担幅であ
っても回転速度度差によって、外周刃チップ７の実質的
負担が高いことからである。Further, the center blade tip 6 and the outer peripheral blade tip 7 are arranged such that the center blade tip 6 precedes the outer peripheral blade tip 7 in the rotational locus in cutting the work material 9 and the center blade tip in the radial direction. The cutting load width A of 6 is made larger than the cutting load width B of the outer peripheral blade tip 7. The preceding amount δ 2 of the center blade tip 6 is usually δ 2
= 0.2 to 0.3 mm. The cutting load widths A and B are set to A> B in order to reduce the load on the outer peripheral blade tip 7. This is because even if the width of load is the same, the substantial load on the outer peripheral blade tip 7 is high due to the difference in rotational speed.
【００１３】[0013]
【発明の効果】本発明は、以上説明したように、中心刃
チップ６および外周刃チップ７における切刃構成および
切削負担を特定関係にあるように設定したものであるか
ら切削性能の向上が期待できるものである。この結果、
本発明のスローアウェイ式ドリルでは、特に外周刃チッ
プ７の構成に影響する加工穴精度が向上し、切屑の排出
性も向上するという利点を有する。As described above, according to the present invention, the cutting edge structure and the cutting load of the center blade tip 6 and the outer peripheral blade tip 7 are set so as to have a specific relationship, so that the cutting performance is expected to be improved. It is possible. As a result,
The throw-away drill of the present invention has the advantages that the precision of the machined hole that particularly affects the configuration of the outer peripheral blade tip 7 is improved, and the chip discharge property is also improved.
【図１】本発明スローアウェイ式ドリルの一実施例を示
す要部の正面図、FIG. 1 is a front view of a main part showing an embodiment of a throw-away type drill of the present invention,
【図２】底面図。FIG. 2 is a bottom view.
１ ドリル本体 ２ フルート溝 ３ フルート溝 ４ チップ座 ５ チップ座 ６ 中心刃チップ ６ａ 切刃稜 ７ 外周刃チップ ７ａ 切刃稜 ８ 基準直径線 1 Drill Body 2 Flute Groove 3 Flute Groove 4 Tip Seat 5 Tip Seat 6 Center Blade Tip 6a Cutting Edge 7 Peripheral Edge Tip 7a Cutting Edge 8 Standard Diameter Line
Claims (1)
る中心刃チップ６および外周刃チップ７それぞれが取付
けられ、しかもこれらの中心刃チップ６および外周刃チ
ップ７は、１つおきの頂角が等しくなるように、その隣
合せの頂角に大小関係を付与した等辺６角形板からな
り、ドリル本体１に取付けられたときには、大きな頂角
部分に構成された切刃稜６ａ，７ａが直径方向で略等し
い取付け角αで振分けられるようになっているスローア
ウェイ式ドリルにおいて、前記中心刃チップ６および外
周刃チップ７は、ドリル本体１の端面視方向では、中心
刃チップ６の切刃稜６ａが基準直径線８に対して平行な
芯下り状態にあるとともに、約１８０°離れた位置関係
にある外周刃チップ７の切刃稜７ａが前記基準直径線８
に対して平行な芯上り状態にあり、また、切削による回
転軌跡では、前記中心刃チップ６が外周刃チップ７に対
して、軸方向で先行するとともに、径方向における中心
刃チップ７の切削負担幅Ａを外周刃チップ７の切削負担
幅よりも大きくしていることを特徴とするスローアウェ
イ式ドリル。Claims: 1. A center blade tip 6 and an outer peripheral blade tip 7 having the same shape are attached to the tip of the drill body 1, and these center blade tip 6 and outer peripheral blade tip 7 are A cutting edge that is composed of equilateral hexagonal plates in which the vertical angles adjacent to each other are made equal to each other so that the vertical angles are the same. In a throw-away type drill in which ridges 6a, 7a are distributed at substantially equal mounting angles α in the diametrical direction, the center blade tip 6 and the outer peripheral blade tip 7 are center blades in the end face view direction of the drill body 1. The cutting edge 6a of the tip 6 is in a down-centered state parallel to the reference diameter line 8, and the cutting edge 7a of the outer peripheral cutting tip 7 which is in a positional relationship of about 180 ° apart has the reference diameter line 8 mentioned above.
In addition, the center blade tip 6 axially precedes the outer peripheral blade tip 7 in the rotational trajectory due to the cutting, and the cutting load of the center blade tip 7 in the radial direction is present. A throw-away type drill characterized in that the width A is made larger than the cutting burden width of the outer peripheral blade tip 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3182904A JP2704917B2 (en) | 1991-06-27 | 1991-06-27 | Indexable drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3182904A JP2704917B2 (en) | 1991-06-27 | 1991-06-27 | Indexable drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH054106A true JPH054106A (en) | 1993-01-14 |
| JP2704917B2 JP2704917B2 (en) | 1998-01-26 |
Family
ID=16126413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3182904A Expired - Fee Related JP2704917B2 (en) | 1991-06-27 | 1991-06-27 | Indexable drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2704917B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11226476B2 (en) | 2016-09-30 | 2022-01-18 | Olympus Corporation | Specimen observation apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4976181B2 (en) | 2006-12-25 | 2012-07-18 | 住友電工ハードメタル株式会社 | Tip placement method for throw-away drills |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5636655A (en) * | 1979-09-04 | 1981-04-09 | Ricoh Co Ltd | Electrostatic recording material |
| JPS60104604A (en) * | 1983-11-14 | 1985-06-10 | Nachi Fujikoshi Corp | Drilling tool |
-
1991
- 1991-06-27 JP JP3182904A patent/JP2704917B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5636655A (en) * | 1979-09-04 | 1981-04-09 | Ricoh Co Ltd | Electrostatic recording material |
| JPS60104604A (en) * | 1983-11-14 | 1985-06-10 | Nachi Fujikoshi Corp | Drilling tool |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11226476B2 (en) | 2016-09-30 | 2022-01-18 | Olympus Corporation | Specimen observation apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2704917B2 (en) | 1998-01-26 |
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