JP2003080411A - Small diametrical drill for deep hole drilling - Google Patents
Small diametrical drill for deep hole drillingInfo
- Publication number
- JP2003080411A JP2003080411A JP2001271340A JP2001271340A JP2003080411A JP 2003080411 A JP2003080411 A JP 2003080411A JP 2001271340 A JP2001271340 A JP 2001271340A JP 2001271340 A JP2001271340 A JP 2001271340A JP 2003080411 A JP2003080411 A JP 2003080411A
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- Prior art keywords
- drill
- cutting
- cutting fluid
- groove
- deep hole
- 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
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はドリルとりわけ深穴
加工に好適な小径ドリルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill, especially a small diameter drill suitable for deep hole machining.
【０００２】[0002]
【従来の技術】医療用部品や金型部品など各種機械部品
において，アスペクト比（穴深さ／穴径）１０を越える
ような小径の深穴加工の要求は多い。しかしながら，こ
の加工は難加工法の１つとされている。すなわち、一般
に穴加工のドリルとしては、２枚刃で右ねじれの切りく
ず排出溝を２本有するツイストドリルと称されるものが
汎用されているが、こうしたドリルは切りくず排出溝が
切削油剤溝を兼ねているため、切りくずの排出はスムー
ズでも切削油剤は逆に排出されるように作用する。2. Description of the Related Art In various machine parts such as medical parts and mold parts, there is a great demand for drilling a small diameter deep hole having an aspect ratio (hole depth / hole diameter) exceeding 10. However, this processing is regarded as one of difficult processing methods. That is, generally, as a drill for drilling a hole, a so-called twist drill having two right-handed chip discharge grooves with two right-handed blades is generally used. Since it also serves as a cutting fluid, the cutting fluid is discharged in the opposite direction even if the chips are discharged smoothly.
【０００３】このため、深穴あけ加工を行なおうとした
場合、穴が深くなるほど加工中に切削点に切削油剤が到
達せず、潤滑状態が悪くなり、あるいは切りくずの排出
が困難になる。それにより切削熱上昇や工具摩耗の急速
な進行，あるいは切りくず詰まりなどの不具合が発生す
るのである。For this reason, when deep hole drilling is attempted, the deeper the hole, the less the cutting fluid reaches the cutting point during machining, the poorer the lubrication state, or the more difficult chip discharge becomes. As a result, problems such as increased cutting heat, rapid tool wear, and chip clogging occur.
【０００４】これらの問題点の対策として，ドリルを連
続的に進めるのでなく、間欠的（前進−後進を繰り返
す）に進め、刃先に十分切削油剤がかかるようにするこ
とが行われているが、深穴になればなるほどドリルの出
し入れを頻繁に行なわなければならないため、加工効率
が非常に悪くなるという問題があり、実用的とはいえな
かった。As a countermeasure against these problems, it is known that the drill is not advanced continuously but is advanced intermittently (repeating forward-reverse) so that the cutting fluid is sufficiently applied to the cutting edge. The deeper the hole, the more frequently the drill has to be taken in and out, which causes a problem that the working efficiency becomes very poor, which is not practical.
【０００５】そこで、穴径が直径３mm程度以上での深穴
あけ加工に関しては，従来、一般的に，ドリルのボデイ
内部に注油穴を穿設して先端から噴出させるようにした
オイルホールドリルや、切刃が１枚のストレート溝を有
するガンドリルが用いられ，それらによりある程度の加
工性能向上が実現できている。Therefore, for deep drilling with a hole diameter of about 3 mm or more, conventionally, an oil hole drill has been generally used in which an oiling hole is bored in the body of the drill so as to eject from the tip. A gun drill with a single straight cutting edge is used, and these have improved the machining performance to some extent.
【０００６】しかしながら、前者は、穴径が直径３ｍｍ
程度以下になると油穴をボデイに加工することが極めて
困難となり、工具コストが高くなったり、工具剛性が低
くなる問題が生ずる。また、工作機械に主軸を通じてド
リルに切削油剤を供給する設備を備えさせることが必要
となったり、高圧で切削油剤を供給できる高圧クーラン
ト装置が必要になるという問題がある。後者も、やはり
直径が３ｍｍ程度以下のドリルの製造は極めて難しく、
工具コストが高くなること、専用のガンドリルマシンを
設備する必要があることなどの問題があった。However, the former has a hole diameter of 3 mm.
If it is less than a certain level, it becomes extremely difficult to machine the oil hole into a body, which causes a problem that the tool cost becomes high and the tool rigidity becomes low. In addition, there is a problem in that it is necessary to equip a machine tool with equipment for supplying a cutting fluid to a drill through a spindle, and a high-pressure coolant device that can supply the cutting fluid at a high pressure. Also in the latter, it is extremely difficult to manufacture a drill with a diameter of about 3 mm or less,
There were problems such as high tool cost and the need to install a dedicated gun drill machine.
【０００７】[0007]
【発明が解決しようとする課題】本発明は前記のような
問題点を解消するためになされたもので、その目的とす
るところは、オイルホールを有しない簡単な構造であり
ながらドリル刃先への切削油剤供給能力がすぐれるとと
もに切りくず排出性も向上することができ、直径が３ｍ
ｍ程度以下にして５Ｄ以上の小径深穴加工を能率良く低
コストで行なえる深穴加工用小径ドリルを提供すること
にある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a simple structure without an oil hole to a drill cutting edge. Excellent cutting oil supply capability and improved chip evacuation, with a diameter of 3 m
It is an object to provide a small-diameter drill for deep-hole drilling which can efficiently carry out a small-diameter deep-hole drilling of 5D or more with a diameter of about m or less at low cost.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
本発明は、外周に長手方向に沿って切りくず排出溝を形
成したドリルにして、先端から３Ｄの位置を除いて上方
のマージン部に、ドリルの回転による遠心力により切削
油剤を取り込みこれをさらに強制的にドリル刃先方向に
送り込むための左傾斜角を有する複数本の切削油剤導入
溝と、前記切削油剤導入溝を上下に連結して切削油剤導
入溝に取り込まれた切削油剤を刃先に到達させるための
切削油剤供給溝とを設けていることを特徴としている。In order to achieve the above object, the present invention provides a drill having a chip discharge groove formed in the outer periphery along the longitudinal direction, and is provided in a margin portion above the tip except for the position 3D. , The cutting oil is taken in by centrifugal force due to the rotation of the drill, and a plurality of cutting oil introduction grooves having a left tilt angle for further forcibly sending this into the drill cutting edge direction and the cutting oil introduction groove are connected vertically. It is characterized in that it is provided with a cutting oil supply groove for making the cutting oil introduced into the cutting oil introduction groove reach the cutting edge.
【０００９】切れ刃が２枚の場合、切り屑排出溝と切削
油剤供給溝はそれぞれ２本、線対称に設けられる。When there are two cutting edges, two chips discharge grooves and two cutting oil supply grooves are provided in line symmetry.
【００１０】[0010]
【発明の実施の形態】以下本発明の実施例を添付図面を
参照して説明する。図１は本発明を１枚刃タイプの小径
深穴加工用ドリルに適用した実施例（第１実施例）を示
している。前記ドリルは、シャンク１とボテイ２を有
し、ボテイ２は、切れ刃３とすくい面と逃げ面およびチ
ゼルエッジで構成される先端部Ａが形成されており、こ
の切れ刃３の領域に達するように切りくず排出溝４が縦
設されている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment (first embodiment) in which the present invention is applied to a single blade type small diameter deep hole drill. The drill has a shank 1 and a body 2, and the body 2 is formed with a cutting edge 3, a rake face, a flank, and a tip A composed of a chisel edge so that the area of the cutting edge 3 is reached. A chip discharge groove 4 is provided vertically.
【００１１】この切りくず排出溝４は、切りくずを排出
するのに十分なように、従来のツイストドリルとほぼ同
じ大きさを有して、ボデイ軸線方向に延びているが、基
本的にはねじれ角を有さない。ただし、切れ味を向上す
る目的で、すくい角を正にするために前記先端部（切削
作用をする部分）のみに１０°以下程度のねじれ角をつ
けていてもよい。The chip discharge groove 4 has substantially the same size as a conventional twist drill and extends in the axial direction of the body so as to be sufficient for discharging chips, but basically it is basically the same. It has no twist angle. However, for the purpose of improving sharpness, a twist angle of about 10 ° or less may be added only to the tip portion (a portion that performs a cutting action) in order to make the rake angle positive.
【００１２】また、前記先端部Ａから３Ｄ（Ｄは直径）
の距離の領域を除いて切刃部ほぼ全域の円筒面部分（マ
ージン部分）１０に、３０〜４５°の左傾斜角θを有す
る数本から数十本の切削油剤導入溝５を等間隔で形成し
ており、それら各切削油剤導入溝５の端は、この例で
は、前記切りくず排出溝４に達している。Further, from the tip A to 3D (D is a diameter)
A few to several tens of cutting oil introduction grooves 5 having a left tilt angle θ of 30 to 45 ° are equidistantly provided on the cylindrical surface portion (margin portion) 10 in almost the entire cutting edge portion except the area of the distance. In this example, the ends of the respective cutting fluid introducing grooves 5 have reached the chip discharging groove 4.
【００１３】これら切削油剤導入溝５はドリルの回転に
よる遠心力により，切削油剤を取り込み，これをさらに
同溝に沿って強制的にドリル刃先方向に送り込むポンプ
の作用をさせるためのもので、この作用を効率よく実現
するために、各切削油剤導入溝５は、後述する切削油剤
供給溝の２倍程度の断面積を有し、断面形状は放物線形
状ないし複合アール形状をなし、かつ、図１（ｅ）のよ
うに、溝の片側斜面の立ち上がり角度γは、切削油剤を
溝内に効果的に取り込むことができるようにするため、
９０°以上の角度を有している。These cutting oil introduction grooves 5 are for acting as a pump for taking in the cutting oil by the centrifugal force generated by the rotation of the drill and forcibly feeding the cutting oil along the groove in the direction of the drill blade edge. In order to efficiently realize the action, each cutting oil introduction groove 5 has a cross-sectional area about twice as large as a cutting oil supply groove described later, the cross-sectional shape is a parabolic shape or a compound round shape, and As shown in (e), the rising angle γ of the slope on one side of the groove allows the cutting fluid to be effectively taken into the groove.
It has an angle of 90 ° or more.
【００１４】さらに、前記切りくず排出溝４と周方向で
変位した円筒面部分１０には、前記切りくず排出溝４と
略平行に走る切削油剤供給溝６を形成している。この切
削油剤供給溝６は、切削油剤導入溝５によって取り込ま
れた切削油剤を刃先に到達させる通路として機能させる
ためのもので、断面積が切りくず排出溝４と比べて１／
５程度となっており、先端が先端部の切削点に達してい
る。切削油剤供給溝６には前記各切削油剤導入溝５の他
端が通じており、したがって、各切削油剤導入溝５は上
下が切削油剤供給溝６によって連結されている。切削油
剤導入溝５の断面積を、切りくず排出溝４の１／５程度
としたのは、必要かつ十分な切削油剤供給能力が得ら
れ、かつドリル強度の低下に与える影響が小さいことを
見い出したことによる。Further, a cutting fluid supply groove 6 running substantially parallel to the chip discharge groove 4 is formed on the cylindrical surface portion 10 displaced in the circumferential direction from the chip discharge groove 4. The cutting fluid supply groove 6 is for functioning as a passage for allowing the cutting fluid taken in by the cutting fluid introduction groove 5 to reach the cutting edge, and has a cross-sectional area 1 / th that of the chip discharge groove 4.
It is about 5, and the tip reaches the cutting point of the tip. The other end of each of the cutting fluid introduction grooves 5 communicates with the cutting fluid supply groove 6, so that the top and bottom of each cutting fluid introduction groove 5 are connected by the cutting fluid supply groove 6. It was found that the cross-sectional area of the cutting fluid introduction groove 5 was set to about 1/5 of that of the chip discharge groove 4 because a necessary and sufficient cutting fluid supply capacity was obtained and the influence on the reduction of drill strength was small. It depends.
【００１５】図２は本発明を２枚刃タイプの小径深穴加
工用ドリルに適用した実施例（第２実施例）を示してい
る。この第２実施例では、外周に２本の切りくず排出溝
４，４と、２本の切削油剤供給溝６，６が対称的に形成
されており、各組の切りくず排出溝４と切削油剤供給溝
４間にそれぞれ３０〜４５°から選ばれる左傾斜角θを
有する数本から数十本の切削油剤導入溝５，５を等間隔
で、先端部から３Ｄの距離を除いて形成している。その
他の構成は前記第１実施例と同じであるから、説明は援
用することとし、同じ部分に同じ符号を付にとどめる。
図３（ａ）におけるＸ−Ｘ線の断面は図２（ｄ）と同様
である。FIG. 2 shows an embodiment (second embodiment) in which the present invention is applied to a two-blade type drill for drilling small diameter deep holes. In the second embodiment, two chip discharge grooves 4 and 4 and two cutting fluid supply grooves 6 and 6 are symmetrically formed on the outer circumference, and each set of chip discharge groove 4 and cutting is formed. Several to several tens of cutting fluid introduction grooves 5 and 5 each having a left tilt angle θ selected from 30 to 45 ° are formed between the fluid supply grooves 4 at equal intervals except for a distance of 3D from the tip. ing. Since other configurations are the same as those of the first embodiment, the description will be incorporated, and the same reference numerals will be given to the same portions.
The cross section taken along line XX in FIG. 3A is the same as that in FIG.
【００１６】図３は本発明を２枚刃タイプでかつ先端部
ねじれ角付きの小径深穴加工用ドリルに適用した実施例
（第３実施例）を示している。この第３実施例では、切
りくず排出溝４がすくい角を正にするために前記先端部
分のみ、１０°以下のねじれ角ρを有している。他の構
成は第２実施例と同様であるから、説明は省略する。FIG. 3 shows an embodiment (third embodiment) in which the present invention is applied to a drill for small-diameter deep hole drilling having a two-blade type and a helix at the tip. In the third embodiment, the chip discharge groove 4 has a twist angle ρ of 10 ° or less only in the tip portion in order to make the rake angle positive. The rest of the configuration is similar to that of the second embodiment, so the explanation is omitted.
【００１７】図４は本発明をスローアゥエイタイプの小
径深穴加工用ドリルに適用した実施例（第４実施例）を
示している。この第４実施例においては、先端部の切れ
刃としてスローアウェイチップ３’を用いており、他の
構成は前記第１実施例と同じである。FIG. 4 shows an embodiment (fourth embodiment) in which the present invention is applied to a slow-away type drill for drilling small diameter deep holes. In the fourth embodiment, a throw-away tip 3'is used as a cutting edge at the tip end, and the other configurations are the same as those in the first embodiment.
【００１８】本発明は前記実施例に限定されるものでは
ない。たとえば、切削油剤導入溝５は、一端が切削油剤
供給溝６に通じていることが不可欠であるが、他端は必
ずしも切りくず排出溝４に通じていることは必要でな
く、図５（ａ）（ｂ）で例示するように、切りくず排出
溝４の手前で止まっていてもよい。この態様は、第１実
施例ないし第４実施例に適用される。The present invention is not limited to the above embodiment. For example, it is essential that one end of the cutting fluid introduction groove 5 communicates with the cutting fluid supply groove 6, but it is not necessary that the other end communicates with the chip discharge groove 4, as shown in FIG. ) As illustrated in (b), it may stop before the chip discharge groove 4. This aspect is applied to the first to fourth embodiments.
【００１９】なお、本発明は、むくドリルやスローアゥ
エイドリルのほか、溶接ドリル、付刃ドリル、先むくド
リル、差し込みドリルなどにも適用できる。ドリル材質
としては、高速度工具鋼（圧延、粉末）、超硬合金、ｃ
ＢＮ、ダイヤモンド工具のソリットタイプないしはろう
付けタイプなどの材質から選択される。The present invention can be applied to welding drills, blade drills, tip drills, insertion drills, etc., as well as peeling drills and throw away drills. Drill materials include high-speed tool steel (rolled, powder), cemented carbide, c
It is selected from materials such as BN and solit type or brazing type of diamond tools.
【００２０】[0020]
【実施例の作用】実施例に示す本発明ドリルの作用を説
明すると、所望の被削材（鉄鋼、アルミニウムその他あ
らゆる金属材料ないしプラスチックなどの非金属材料）
に直径が３ｍｍ以下にして５Ｄ以上の細径の深穴を加工
するにあたっては、シャンク１をもって工作機械に取り
付け、所要の回転数にて回転させつつボデイに切削油剤
を噴射あるいは注ぎ込みなどの方式で供給する。切削油
剤は水溶性切削油剤、鉱物系切削油剤など加工に適した
ものが適宜選択される。The operation of the drill of the present invention shown in the embodiments will be described. A desired work material (steel, aluminum or any other metal material or non-metal material such as plastic).
When machining a deep hole with a diameter of 3 mm or less and a diameter of 5 D or more, attach the shank 1 to the machine tool and rotate it at the required number of revolutions while injecting or pouring the cutting fluid into the body. Supply. As the cutting oil, a water-soluble cutting oil, a mineral cutting oil or the like suitable for processing is appropriately selected.
【００２１】このようにしてドリルが回転すると、かけ
られた切削油剤７は、ドリルの回転に伴う遠心力により
切削油剤導入溝５に流れ込む。切削油剤導入溝５は３０
〜４５°の左傾斜角θを有しているため、図５で模式的
に示すように、切削油剤７を積極的に取り込みつつ斜め
下方（ドリル刃先方向）へと強制的にポンピングし、切
削油剤導入溝５の下端に通じている切削油剤供給溝６に
強力に吐出させる。通常のツイストドリルではドリルの
回転数が早くなるほど切削油剤をシャンク（上側）に向
かって排出する作用をするのに対し、本発明では、回転
数が早くなるほどより強力に切削油剤７を切削油剤供給
溝６に送り込む。When the drill rotates in this way, the applied cutting fluid 7 flows into the cutting fluid introduction groove 5 by the centrifugal force accompanying the rotation of the drill. Cutting oil introduction groove 5 is 30
Since it has a left tilt angle θ of up to 45 °, as shown schematically in FIG. 5, the cutting fluid 7 is positively taken in and forcedly pumped obliquely downward (drill cutting edge direction) to perform cutting. The cutting fluid supply groove 6 communicating with the lower end of the fluid introduction groove 5 is strongly discharged. In a normal twist drill, the faster the rotation speed of the drill is, the more the cutting oil is discharged toward the shank (upper side), whereas in the present invention, the faster the rotation speed is, the stronger the supply of the cutting oil 7 is. Feed it into the groove 6.
【００２２】切削油剤供給溝６は切削油剤導入溝５と交
差してドリルの先端部に通じており、しかも切削油剤供
給溝６はマージン部断面そのものを断面が平坦形状にし
て構成されたものではなく、円筒面部分をえぐって作ら
れ、半径方向は切削された穴面によって閉じられて閉鎖
輪郭の通路となっているから、切削油剤導入溝５から送
り込まれた切削油剤７は、切削油剤供給溝６を通って先
端部の切れ刃３に供給される。刃先に送り込まれた切削
油剤は潤滑や冷却などの機能を果たし，使用済みの切削
油剤７’は、切削された切り屑８とともに切りくず排出
溝４を通り、穴外に排出される。The cutting fluid supply groove 6 intersects with the cutting fluid introduction groove 5 and communicates with the tip of the drill. Moreover, the cutting fluid supply groove 6 is not constructed so that the margin itself has a flat cross section. However, since it is formed by hollowing out the cylindrical surface portion and is closed by the hole surface cut in the radial direction to form a closed contour passage, the cutting fluid 7 fed from the cutting fluid introduction groove 5 is supplied with the cutting fluid supply. It is supplied to the cutting edge 3 at the tip through the groove 6. The cutting fluid fed to the cutting edge fulfills functions such as lubrication and cooling, and the used cutting fluid 7'is discharged together with the cut chips 8 through the chip discharge groove 4 and discharged outside the hole.
【００２３】本発明においては、切削油剤７は切削油剤
導入溝５と切削油剤供給溝６によって供給され，切りく
ず８と使用済み切削油剤７’は切りくず排出溝４より排
出されるというように，両者の役割が完全に分離してお
り、また、切削油剤導入溝５はドリルの回転を利用して
ポンプのように切りくずを刃先へと送り込む機能を有す
る。したがって、切り屑の排出も効率よく行われる。In the present invention, the cutting fluid 7 is supplied by the cutting fluid introduction groove 5 and the cutting fluid supply groove 6, and the chips 8 and the used cutting fluid 7'are discharged from the chip discharge groove 4. The roles of the two are completely separated, and the cutting fluid introduction groove 5 has a function of feeding the chips to the cutting edge like a pump by utilizing the rotation of the drill. Therefore, chips can be efficiently discharged.
【００２４】本発明では切削油剤は切削油剤導入溝５お
よび切削油剤供給溝６によって確実に切れ刃に到達され
るように供給され、供給能力がすぐれるため、切削油剤
の使用量はツイストドリルの場合の１／５程度で済むこ
とになり、経済的、環境対応にも優れている。In the present invention, the cutting fluid is supplied by the cutting fluid introduction groove 5 and the cutting fluid supply groove 6 so as to surely reach the cutting edge, and the supply ability is excellent. Therefore, the amount of the cutting fluid used is that of the twist drill. It will be about 1/5 of the case, and it is excellent in economic and environmental friendliness.
【００２５】また、切りくず排出溝４、切削油剤導入溝
５および切削油剤供給溝６はＪＩＳ規格のドリルに対す
る外周部のみの加工ですみ、オイルホールドリルのよう
なボデイへの穿孔の必要がなく、また、ドリル形状を断
面がたとえば鼓に類する特殊な形状にする必要もないの
で、ツイストドリル並みの安価なものとすることができ
るとともに、微小な直径のドリルに容易に適用できる。
第２実施例のように２枚刃でかつ先端部にねじれ角をつ
けた場合には、すくい角が正となって切れ味と切削性を
向上することができる。Further, the chip discharge groove 4, the cutting oil introduction groove 5 and the cutting oil supply groove 6 need only be machined on the outer peripheral portion of a JIS standard drill, and there is no need to drill a body such as an oil hole drill. Further, since it is not necessary to make the shape of the drill into a special shape having a cross section like a drum, it can be made as inexpensive as a twist drill and can be easily applied to a drill having a minute diameter.
In the case of a double-edged blade with a helix angle at the tip as in the second embodiment, the rake angle becomes positive and the sharpness and machinability can be improved.
【００２６】〔具体例〕本発明によるドリルを製作し、
実地に試験した。試作ドリルは、図１に示す１枚刃、直
径３ｍｍ、長さ８０ｍｍとし，材質は高速度工具鋼とし
た。切削油剤導入溝は４５°の左傾斜角θ、断面積１．
２ｍｍ2とし、これを切刃から９ｍｍの位置から上方に
等間隔で８本形成した。切削油剤供給溝は断面積０．８
ｍｍ2とし、切りくず排出溝は断面積４．０ｍｍ2とし
た。[Specific Example] A drill according to the present invention is manufactured,
Tested in the field. The prototype drill had a single blade shown in FIG. 1, a diameter of 3 mm and a length of 80 mm, and was made of high-speed tool steel. The cutting fluid introduction groove has a left tilt angle θ of 45 ° and a cross-sectional area of 1.
8 mm was formed at a distance of 9 mm from the cutting edge and 2 mm 2 . Cross-sectional area of cutting fluid supply groove is 0.8
and mm 2, chip discharge grooves was cross-sectional area 4.0 mm 2.
【００２７】切削油剤の供給特性を見るため、小型汎用
ボール盤を用いてこれにドリルを取り付け回転させ，そ
れに切削油剤を外部供給した場合の切削油剤の飛散状況
を観察した。その結果，通常のツイストドリルの場合，
切削油剤は，多くは水平方向に飛散した。それに対し，
本発明ドリルの場合，切削油剤は４５°より下方に飛散
し，多くの油剤はドリルに絡みながら下方に落下する挙
動を示した。このことから、本発明ドリルはドリル先端
に切削油が流入しやすいことがわかる。In order to examine the supply characteristics of the cutting oil, a small general-purpose drilling machine was used, a drill was attached to the drill, and the cutting oil was scattered when the cutting oil was externally supplied to the drill. As a result, in the case of a normal twist drill,
Most of the cutting fluid sprayed horizontally. For it,
In the case of the drill of the present invention, the cutting fluid scattered below 45 °, and most of the cutting fluid showed a behavior of falling downward while being entangled with the drill. From this, it is understood that the drill of the present invention easily allows cutting oil to flow into the tip of the drill.
【００２８】次に、被削材としてアルミニウム合金Ａ２
０１７を用い，切削油剤に不水溶性および水溶性の２種
類を用い、実際にアスペクト比１０の深穴あけ加工を行
なってみた。切削条件は、回転数Ｎ：２６００，送り
ｆ：０．１ｍｍ／ｒｅｖとした。 そのときの加工穴内
面の各深さ位置（１０ｍｍ、２０ｍｍおよび３０ｍｍ）
における表面粗さ測定結果を、ツイストドリルと比較し
て図７に示す。図７（ａ）は本発明ドリル、（ｂ）はツ
イストドリルである。Next, aluminum alloy A2 is used as a work material.
017 was used, and two kinds of water-insoluble and water-soluble cutting oils were used to actually perform deep drilling with an aspect ratio of 10. The cutting conditions were rotation speed N: 2600 and feed f: 0.1 mm / rev. Each depth position of the inner surface of the machined hole at that time (10 mm, 20 mm and 30 mm)
The surface roughness measurement result in Fig. 7 is shown in Fig. 7 in comparison with the twist drill. FIG. 7A shows the drill of the present invention, and FIG. 7B shows the twist drill.
【００２９】通常のツイストドリルの場合，穴深さが１
０ｍｍ以上になると，切削油剤切れのため被削材の刃先
溶着が著しく，粗い切削面になったのに対し，本発明ド
リルの場合，穴深さ３０ｍｍに至るまで良好な表面粗さ
が得られている。この結果は、本発明は切りくず排出
溝、切削油剤導入溝および切削油剤供給溝の相乗作用に
より、切削油剤が深穴の場合でも刃先に十分供給された
ことによるのは明らかである。なお、切り屑ついて観察
したところ、通常のツイストドリルの場合には長い連続
したものとなっていたのに対して、本発明ドリルでは断
続に近い切り屑となっていた。In the case of a normal twist drill, the hole depth is 1
At 0 mm or more, the cutting edge of the work material was markedly welded due to cutting of the cutting oil, resulting in a rough cutting surface, whereas in the case of the drill of the present invention, good surface roughness up to a hole depth of 30 mm was obtained. ing. It is clear that this result is that the present invention is sufficiently supplied to the cutting edge even when the cutting oil is a deep hole due to the synergistic action of the chip discharge groove, the cutting oil introduction groove and the cutting oil supply groove. When the chips were observed, it was found that, in the case of the normal twist drill, the chips were long and continuous, whereas in the drill of the present invention, the chips were close to intermittent.
【００３０】[0030]
【発明の効果】以上説明した本発明の請求項１によれ
ば、ドリル刃先への切削油剤供給能力がすぐれるととも
に切りくず排出性が良好で、アスペクト比５以上の深穴
小径加工を確実に行なうことができ、しかも、構造が簡
単で汎用形状に近く、ドリルを特殊断面形状にしたりオ
イルホールを設けるといった特殊な加工なしに外周面加
工だけの低コストで得ることができるというすぐれた効
果が得られる。請求項２によれば、各切れ刃に確実に切
削油剤を供給できるともに、切りくずを円滑に排出でき
るので深穴小径加工の切削能率を高くすることができる
というすぐれた効果が得られる。According to the first aspect of the present invention described above, the cutting oil supply capability to the drill cutting edge is excellent, the chip discharging property is good, and the deep hole small diameter machining with the aspect ratio of 5 or more is surely performed. Moreover, it has an excellent effect that it can be performed, its structure is simple and it is close to a general-purpose shape, and it can be obtained at low cost only by machining the outer peripheral surface without special processing such as making the drill a special sectional shape or providing an oil hole can get. According to the second aspect, the cutting oil can be surely supplied to each cutting edge, and the chips can be smoothly discharged, so that an excellent effect that the cutting efficiency of the deep hole small diameter machining can be enhanced can be obtained.
【図１】（ａ）は本発明による深穴加工用小径ドリルの
第１実施例を示す全体図、（ｂ）はその拡大正面図、
（ｃ）はその拡大側面図、（ｄ）は底面図、（ｅ）は切
削油剤導入溝の縦断拡大図である。1A is an overall view showing a first embodiment of a small diameter drill for deep hole machining according to the present invention, FIG. 1B is an enlarged front view thereof, FIG.
(C) is the enlarged side view, (d) is a bottom view, (e) is a longitudinal enlarged view of the cutting fluid introduction groove.
【図２】（ａ）は本発明の第２実施例を示す拡大側面
図、（ｂ）はその正面図、（ｃ）は底面図、（ｄ）は
（ａ）のＸ−Ｘ線に沿う断面図である。2A is an enlarged side view showing a second embodiment of the present invention, FIG. 2B is a front view thereof, FIG. 2C is a bottom view, and FIG. 2D is a view taken along line XX of FIG. FIG.
【図３】（ａ）は本発明の第３実施例を示す拡大側面
図、（ｂ）はその正面図、（ｃ）は底面図である。3A is an enlarged side view showing a third embodiment of the present invention, FIG. 3B is a front view thereof, and FIG. 3C is a bottom view thereof.
【図４】（ａ）は本発明の第４実施例を示す拡大正面
図、（ｂ）はその側面図、（ｃ）は底面図である。4A is an enlarged front view showing a fourth embodiment of the present invention, FIG. 4B is a side view thereof, and FIG. 4C is a bottom view.
【図５】（ａ）は本発明の他の態様例を示す側面図、
（ｂ）は同じくその断面図である。FIG. 5 (a) is a side view showing another embodiment of the present invention,
(B) is a sectional view of the same.
【図６】本発明ドリルの作用を模式的に示す説明図であ
る。FIG. 6 is an explanatory view schematically showing the operation of the drill of the present invention.
【図７】（ａ）は本発明ドリルを使用してアスペクト比
１０の深穴加工を行なったときの各深さでの表面粗さを
示すグラフ、（ｂ）は従来のツイストドリルを使用して
アスペクト比１０の深穴加工を行なったときの各深さで
の表面粗さを示すグラフである。7 (a) is a graph showing the surface roughness at each depth when deep hole drilling with an aspect ratio of 10 is performed using the drill of the present invention, and FIG. 7 (b) shows a conventional twist drill. 6 is a graph showing the surface roughness at each depth when deep hole drilling with an aspect ratio of 10 is performed.
３ 切れ刃 ４ 切りくず排出溝 ５ 切削油剤導入溝 ６ 切削油剤供給溝 ７ 切削油剤 3 cutting edges 4 Chip evacuation groove 5 Cutting fluid introduction groove 6 Cutting fluid supply groove 7 cutting oil
Claims (2)
形成したドリルにして、先端から３Ｄの位置を除いて上
方のマージン部に、ドリルの回転による遠心力により切
削油剤を取り込みこれをさらに強制的にドリル刃先方向
に送り込むための左傾斜角を有する複数本の切削油剤導
入溝と、前記切削油剤導入溝を上下に連結して切削油剤
導入溝に取り込まれた切削油剤を刃先に到達させるため
の切削油剤供給溝とを設けていることを特徴とする深穴
加工用小径ドリル。1. A drill having a chip discharge groove formed in the outer periphery along the longitudinal direction, and the cutting oil is taken in by a centrifugal force due to the rotation of the drill into an upper margin portion except a position 3D from the tip. Furthermore, the cutting fluid introduced into the cutting fluid introduction groove reaches the cutting edge by vertically connecting the cutting fluid introduction grooves with a plurality of cutting fluid introduction grooves having a left inclination angle to forcefully feed the drill cutting edge direction. A small-diameter drill for deep hole drilling, characterized in that it is provided with a cutting oil supply groove.
削油剤供給溝がそれぞれ２本、線対称に設けられている
請求項１に記載の深穴加工用小径ドリル。2. A small-diameter drill for deep hole machining according to claim 1, wherein the cutting edge is composed of two pieces, and each of the chip discharge groove and the cutting oil supply groove is provided in line symmetry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001271340A JP2003080411A (en) | 2001-09-07 | 2001-09-07 | Small diametrical drill for deep hole drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001271340A JP2003080411A (en) | 2001-09-07 | 2001-09-07 | Small diametrical drill for deep hole drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003080411A true JP2003080411A (en) | 2003-03-18 |
Family
ID=19096862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001271340A Pending JP2003080411A (en) | 2001-09-07 | 2001-09-07 | Small diametrical drill for deep hole drilling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003080411A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007142859A2 (en) * | 2006-06-01 | 2007-12-13 | Onsrud Cutter | Polycrystalline diamond tool for cutting |
| JP4919527B1 (en) * | 2011-09-14 | 2012-04-18 | 健治郎 楠 | Drill |
| JP2017052051A (en) * | 2015-09-09 | 2017-03-16 | 三菱マテリアル株式会社 | drill |
| JP2017202541A (en) * | 2016-05-11 | 2017-11-16 | 有限会社栄進機工 | Drill reamer |
| CN107952981A (en) * | 2017-11-17 | 2018-04-24 | 中山市园丰精密刃具有限公司 | The forming cutter of tube handle holes of golf head |
| WO2021038651A1 (en) | 2019-08-23 | 2021-03-04 | 西研株式会社 | Deep-hole-boring single-blade drill |
-
2001
- 2001-09-07 JP JP2001271340A patent/JP2003080411A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007142859A2 (en) * | 2006-06-01 | 2007-12-13 | Onsrud Cutter | Polycrystalline diamond tool for cutting |
| WO2007142859A3 (en) * | 2006-06-01 | 2008-08-28 | Onsrud Cutter | Polycrystalline diamond tool for cutting |
| JP4919527B1 (en) * | 2011-09-14 | 2012-04-18 | 健治郎 楠 | Drill |
| JP2013075355A (en) * | 2011-09-14 | 2013-04-25 | Kenjiro Kusunoki | Drill |
| JP2017052051A (en) * | 2015-09-09 | 2017-03-16 | 三菱マテリアル株式会社 | drill |
| JP2017202541A (en) * | 2016-05-11 | 2017-11-16 | 有限会社栄進機工 | Drill reamer |
| CN107952981A (en) * | 2017-11-17 | 2018-04-24 | 中山市园丰精密刃具有限公司 | The forming cutter of tube handle holes of golf head |
| WO2021038651A1 (en) | 2019-08-23 | 2021-03-04 | 西研株式会社 | Deep-hole-boring single-blade drill |
| US11376672B2 (en) | 2019-08-23 | 2022-07-05 | Nishiken Inc. | Single-edge drill for forming a deep hole |
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