JPH035371Y2 - - Google Patents
Info
- Publication number
- JPH035371Y2 JPH035371Y2 JP13492586U JP13492586U JPH035371Y2 JP H035371 Y2 JPH035371 Y2 JP H035371Y2 JP 13492586 U JP13492586 U JP 13492586U JP 13492586 U JP13492586 U JP 13492586U JP H035371 Y2 JPH035371 Y2 JP H035371Y2
- Authority
- JP
- Japan
- Prior art keywords
- drill
- diameter drill
- small
- drill part
- 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.)
- Expired
Links
- 238000005520 cutting process Methods 0.000 description 24
- 230000007423 decrease Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
Description
【考案の詳細な説明】
Ａ 考案の目的
(1) 産業上の利用分野
本考案は、被加工物に小径孔と大径孔とよりな
る段付孔を形成するために用いられる段付ドリル
に関する。[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to a stepped drill used to form a stepped hole consisting of a small diameter hole and a large diameter hole in a workpiece. .
(2) 従来の技術
従来、この種段付ドリルとして、第４，第５図
に示すように小径ドリル部２′と、それに連設さ
れる大径ドリル部３′と、それら一連に延びる溝
幅の広い２本の大ねじれ溝５1と、両大ねじれ溝
５1間においてそれらと平行に延びる溝幅の狭い
小ねじれ溝５2とを備えたものが知られている。
この場合、大ねじれ溝５1は小径ドリル部２′の切
削により生じた切粉を排出するために用いられ、
また小ねじれ溝５2は大径ドリル部３′の切削によ
り生じた切粉を排出するために用いられる。(2) Prior Art Conventionally, as shown in FIGS. 4 and 5, this type of stepped drill has a small diameter drill part 2', a large diameter drill part 3' connected to the small diameter drill part 2', and a groove extending in series with the small diameter drill part 2'. A known device is provided with two wide large helical grooves 5 1 and a narrow small helical groove 5 2 extending in parallel between the two large helical grooves 5 1 .
In this case, the large helical groove 51 is used to discharge chips generated by cutting the small diameter drill part 2',
Further, the small helical groove 52 is used to discharge chips generated by cutting the large diameter drill portion 3'.
(3) 考案が解決しようとする問題点
しかしながら、前記のように小ねじれ溝５2を
備えると、小ねじれ溝５2とその溝５2よりもドリ
ル回転方向後側に存する大ねじれ溝５1との両底
面間の肉厚t′が薄くなつて剛性が低下し、それに
伴いドリルが切損し易いという問題がある。(3) Problems to be solved by the invention However, when the small helical groove 5 2 is provided as described above, the large helical groove 5 1 that exists on the rear side of the small helical groove 5 2 and the groove 5 2 in the direction of drill rotation. The problem is that the wall thickness t' between the two bottom surfaces becomes thinner and the rigidity decreases, making the drill more likely to break.
本考案は前記問題を解決し得る前記段付ドリル
を提供することを目的とする。 An object of the present invention is to provide the stepped drill that can solve the above problems.
Ｂ 考案の構成
(1) 問題点を解決するための手段
本考案は、小径ドリル部と、それに連設される
大径ドリル部とを備え、両ドリル部はそれらの全
長に亘つて一連に延びる溝幅の等しい複数のねじ
れ溝を有し、前記大径ドリル部の各逃げ面は前記
小径ドリル部の各ランド面より立上つており、前
記逃げ面と交わるすくい面を含む側面を前記ねじ
れ溝のリーデイングエツジよりもドリル回転方向
後側に変位させて前記側面基部と前記リーデイン
グエツジとの間を平坦面に形成したことを特徴と
する。B. Structure of the invention (1) Means for solving the problems The invention includes a small diameter drill part and a large diameter drill part connected to it, and both drill parts extend continuously over their entire length. It has a plurality of helical grooves with equal groove widths, each flank of the large-diameter drill part rises from each land surface of the small-diameter drill part, and the side surface including the rake face that intersects with the flank is connected to the helical groove. A flat surface is formed between the side base and the leading edge by being displaced rearward in the rotational direction of the drill than the leading edge.
(2) 作用
前記のように構成すると、小径ドリル部におい
ては溝幅の等しい複数のねじれ溝が存するだけで
あるから、小径ドリル部は、等径の孔あけに用い
られる通常のドリルと同等の剛性を有する。(2) Effect With the above configuration, the small diameter drill part only has a plurality of twisted grooves with the same groove width, so the small diameter drill part has the same diameter as a normal drill used for drilling holes of equal diameter. It has rigidity.
また大径ドリル部においては、前記側面基部と
それよりもドリル回転方向後側に存するねじれ溝
底面との間の肉厚を厚くし得るので、大径ドリル
部は大きな剛性を有する。 Further, in the large diameter drill part, the wall thickness between the side base and the helical groove bottom surface located on the rear side in the drill rotation direction can be increased, so the large diameter drill part has high rigidity.
小径ドリル部の切削により生じた切粉はねじれ
溝に沿つて排出され、また大径ドリル部の切削に
より生じた切粉は、当初平坦面と側面とのなす切
欠き状部に沿い、最終的にはねじれ溝に進入して
排出される。このように大径ドリル部による切削
直後の、排出速度の速い切粉が、小径ドリル部の
切削により生じてねじれ溝に沿う切粉に直ちに合
流することがないので、両切粉の絡合いによる詰
まりが防止される。 Chips generated by cutting the small-diameter drill part are discharged along the helical groove, and chips generated by cutting the large-diameter drill part initially follow the notch-shaped part formed by the flat surface and the side surface, and are finally discharged. It enters the twisted groove and is ejected. In this way, immediately after cutting with the large-diameter drill part, the chips that are discharged at a high speed do not immediately merge with the chips generated by cutting with the small-diameter drill part and along the helical groove. Blockage is prevented.
(3) 実施例
第１〜第３図において、段付ドリル１は小径ド
リル部２と、それに連設される大径ドリル部３
と、その大径ドリル部３に連設されるシヤンク４
とを備えている。両ドリル部２，３は、それらの
全長に亘つて一連に延びる溝幅の等しい複数、図
示例は２本のねじれ溝５を有する。(3) Example In Figs. 1 to 3, a stepped drill 1 has a small diameter drill part 2 and a large diameter drill part 3 connected thereto.
and a shank 4 connected to the large diameter drill part 3.
It is equipped with Both drill parts 2 and 3 have a plurality of helical grooves 5, in the illustrated example, two helical grooves 5 having the same groove width and extending in series over their entire length.
小径ドリル部２において、その先端部には、各
ねじれ溝５に含まれるすくい面６と各ランド面７
に連なる逃げ面８との交線上に切れ刃９が配設さ
れる。ねじれ溝５は、主として小径ドリル部２に
おける切れ刃９の切削により生じた切粉を排出す
るために用いられる。 In the small diameter drill part 2, at its tip, a rake face 6 and each land face 7 included in each helical groove 5 are provided.
A cutting edge 9 is disposed on the line of intersection with the flank surface 8 that is continuous with the flank surface 8 . The helical groove 5 is mainly used to discharge chips generated by cutting by the cutting edge 9 in the small diameter drill portion 2.
大径ドリル部３において、各逃げ面１０は小径
ドリル部２の各ランド面７より立上つている。ま
た各逃げ面１０と交わるすくい面１１を含む各側
面１２は、各ねじれ溝５のリーデイングエツジ１
３よりもドリル回転方向ａ後側に変位しており、
これにより各側面１２基部と各リーデイングエツ
ジ１３との間は平坦面１４に形成される。 In the large-diameter drill portion 3, each flank 10 rises above each land surface 7 of the small-diameter drill portion 2. Further, each side surface 12 including the rake surface 11 that intersects with each flank surface 10 is located at the leading edge 1 of each helical groove 5.
It is displaced to the rear side in the drill rotation direction a compared to 3.
As a result, a flat surface 14 is formed between the base of each side surface 12 and each leading edge 13.
各すくい面１１と各逃げ面１０との交線上に切
れ刃１５が配設される。各平坦面１４と各側面１
２とにより画成される切欠き状部１６は切れ刃１
５の切削により生じた切粉を当初沿わせ、そして
最終的にねじれ溝５に進入させる作用をなす。 A cutting edge 15 is arranged on the intersection line of each rake face 11 and each flank face 10. Each flat surface 14 and each side 1
The notch-shaped portion 16 defined by the cutting edge 1 and
It serves to cause the chips generated by cutting 5 to initially go along and then finally to enter the helical groove 5.
各平坦面１４におけるドリル回転方向ａの幅
は、ドリル回転中心ｏと、リーデイングエツジ１
３および側面１２基部とをそれぞれ結ぶ二直線ｏ
−ｘ、ｏ−ｙのなす角度θが10〜20゜、好ましく
は約15゜となるように設定される。 The width of each flat surface 14 in the drill rotation direction a is the width between the drill rotation center o and the leading edge 1.
Two straight lines o connecting 3 and the base of side 12, respectively
The angle θ formed by -x and oy is set to 10 to 20 degrees, preferably about 15 degrees.
このように設定する理由は、角度θが20゜を上
回ると、側面１２基部と、それよりもドリル回転
方向ａ後側に存するねじれ溝５底面との間の肉厚
ｔが薄くなつて大径ドリル部３の剛性が低下し、
一方、角度θが10゜を下回ると、平坦面１４のド
リル回転方向幅が狭くなるので切れ刃１５の切削
により生じた切粉が直ちにねじれ溝５内に進入し
て小径ドリル部２の切削により生じた切粉に合流
し、両切粉が絡合つて詰まりを発生するという不
具合を生じるからである。 The reason for this setting is that when the angle θ exceeds 20°, the wall thickness t between the base of the side surface 12 and the bottom surface of the helical groove 5 located on the rear side in the drill rotation direction a becomes thinner, resulting in a larger diameter. The rigidity of the drill part 3 decreases,
On the other hand, when the angle θ is less than 10°, the width of the flat surface 14 in the drill rotation direction becomes narrower, so chips generated by cutting the cutting edge 15 immediately enter the helical groove 5 and are caused by the cutting of the small diameter drill part 2. This is because they join together with the generated chips, causing the two chips to become entangled and cause clogging.
小径ドリル部２においては溝幅の等しい２本の
ねじれ溝５が存するだけであるから、小径ドリル
部２は、等径の孔あけに用いられる通常のドリル
と同等の剛性を有する。 Since there are only two twisted grooves 5 having the same groove width in the small diameter drill part 2, the small diameter drill part 2 has the same rigidity as a normal drill used for drilling holes of the same diameter.
前記構成の段付ドリル１により被加工物に孔あ
け加工を施すと、まず小径ドリル部２の切れ刃９
により小径孔が形成され、切れ刃９の切削により
生じた切粉はねじれ溝５に沿つて排出される。そ
して小径孔はその開口部側より大径ドリル部３の
切れ刃１５により順次拡径され、その切れ刃１５
の切削により生じた切粉は当初切欠き状部１６に
沿い、最終的にねじれ溝５に進入して排出され
る。このねじれ溝５への切粉の進入により、その
切粉が小径ドリル部２側からの切粉と合流する
が、この合流時においては両切粉の排出速度が遅
くなつているのでそれらが絡合うことはない。 When drilling a hole in a workpiece with the stepped drill 1 having the above configuration, first the cutting edge 9 of the small diameter drill portion 2
A small diameter hole is formed by this, and chips generated by cutting with the cutting edge 9 are discharged along the twisted groove 5. Then, the diameter of the small diameter hole is gradually expanded from the opening side by the cutting edge 15 of the large diameter drill part 3, and the cutting edge 15
The chips generated by cutting initially follow the notch-shaped portion 16, and finally enter the helical groove 5 and are discharged. As the chips enter the helical groove 5, they merge with the chips from the small diameter drill part 2, but at the time of this merging, the discharge speed of both chips is slow, so they become entangled. It never matches.
また両ドリル部２，３は前記のように剛性を有
するので、切削作業中に切損するといつた不具合
を生じることがない。 Further, since both drill parts 2 and 3 have rigidity as described above, problems such as breakage during cutting operations will not occur.
なお、本考案は切れ刃を３枚以上備えた段付ド
リルにも適用可能である。また、特に高速、高送
り切削能力を持つ超硬合金製段付ドリルにおい
て、その靭性の低下を補うべく本考案を適用する
ことは有効である。 Note that the present invention can also be applied to a stepped drill having three or more cutting edges. In addition, it is particularly effective to apply the present invention to compensate for the decrease in toughness of cemented carbide stepped drills that have high-speed, high-feed cutting capabilities.
Ｃ 考案の効果
以上のように本考案によれば、極めて簡単な手
段により剛性が高く、切粉が絡合うことのない段
付ドリルを提供することができる。C. Effects of the invention As described above, according to the invention, it is possible to provide a stepped drill which has high rigidity and is free from entanglement of chips by extremely simple means.
第１ないし第３図は本考案の一実施例を示し、
第１図は全体の正面図、第２図は第１図−矢
視図、第３図は第１図−線断面図、第４、第
５図は従来例を示し、第４図は全体の正面図、第
５図は第４図−線断面図である。
ａ……ドリル回転方向、２……小径ドリル部、
３……大径ドリル部、５……ねじれ溝、７……ラ
ンド面、１０……逃げ面、１１……すくい面、１
２……側面、１３……リーデイングエツジ、１４
……平坦面。
1 to 3 show an embodiment of the present invention,
Fig. 1 is a front view of the whole, Fig. 2 is a view taken from the arrow in Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 1, Figs. 4 and 5 show the conventional example, and Fig. 4 shows the whole. FIG. 5 is a sectional view taken along the line shown in FIG. 4. a...Drill rotation direction, 2...Small diameter drill part,
3...Large diameter drill part, 5...Twisted groove, 7...Land surface, 10...Fleet surface, 11...Rake surface, 1
2... Side, 13... Leading edge, 14
...Flat surface.
Claims (1)
ル部とを備え、両ドリル部はそれらの全長に亘
つて一連に延びる溝幅の等しい複数のねじれ溝
を有し、前記大径ドリル部の各逃げ面は前記小
径ドリル部の各ランド面より立上つており、前
記逃げ面と交わるすくい面を含む側面を前記ね
じれ溝のリーデイングエツジよりもドリル回転
方向後側に変位させて前記側面基部と前記リー
デイングエツジとの間を平坦面に形成した段付
ドリル。 (2) 前記平坦面におけるドリル回転方向の幅は、
ドリル回転中心と、前記リーデイングエツジお
よび前記側面基部とをそれぞれ結ぶ二直線のな
す角度が10〜20゜となるように設定される、実
用新案登録請求の範囲第(1)項記載の段付ドリ
ル。[Claims for Utility Model Registration] (1) A small-diameter drill part and a large-diameter drill part connected to the small-diameter drill part, and both drill parts have a plurality of helical grooves with equal groove widths extending continuously over their entire length. Each flank of the large-diameter drill part rises above each land surface of the small-diameter drill part, and the side surface including the rake face that intersects with the flank is arranged in a direction of rotation of the drill relative to the leading edge of the helical groove. A stepped drill that is displaced rearward to form a flat surface between the side base and the leading edge. (2) The width of the flat surface in the drill rotation direction is
The stepped drill according to claim 1 of claim 1, wherein the angle between the two straight lines connecting the drill rotation center, the leading edge, and the side base is 10 to 20 degrees. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13492586U JPH035371Y2 (en) | 1986-09-03 | 1986-09-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13492586U JPH035371Y2 (en) | 1986-09-03 | 1986-09-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6341408U JPS6341408U (en) | 1988-03-18 |
| JPH035371Y2 true JPH035371Y2 (en) | 1991-02-12 |
Family
ID=31036626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13492586U Expired JPH035371Y2 (en) | 1986-09-03 | 1986-09-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH035371Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007007831A (en) * | 2005-07-04 | 2007-01-18 | Osg Corp | Stepped drill |
| JP6576573B1 (en) * | 2018-01-22 | 2019-09-18 | オーエスジー株式会社 | Step drill and method of manufacturing step drill |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4565492B2 (en) * | 2004-05-18 | 2010-10-20 | ダイハツ工業株式会社 | Bushless deep hole machining method |
| JP5973304B2 (en) * | 2012-09-27 | 2016-08-23 | 栗田工機株式会社 | Drill and drilling method |
| ES2799723T3 (en) * | 2014-02-10 | 2020-12-21 | Kuritakoki Co Ltd | Drill bit and drilling method |
-
1986
- 1986-09-03 JP JP13492586U patent/JPH035371Y2/ja not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007007831A (en) * | 2005-07-04 | 2007-01-18 | Osg Corp | Stepped drill |
| JP6576573B1 (en) * | 2018-01-22 | 2019-09-18 | オーエスジー株式会社 | Step drill and method of manufacturing step drill |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6341408U (en) | 1988-03-18 |
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