JP3851804B2 - Replaceable twist drill - Google Patents

Replaceable twist drill Download PDF

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Publication number
JP3851804B2
JP3851804B2 JP2001328583A JP2001328583A JP3851804B2 JP 3851804 B2 JP3851804 B2 JP 3851804B2 JP 2001328583 A JP2001328583 A JP 2001328583A JP 2001328583 A JP2001328583 A JP 2001328583A JP 3851804 B2 JP3851804 B2 JP 3851804B2
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JP
Japan
Prior art keywords
groove
tool body
twist
cutting head
drill
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Expired - Lifetime
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JP2001328583A
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Japanese (ja)
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JP2003136319A (en
Inventor
直宏 中村
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Sumitomo Electric Hardmetal Corp
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Sumitomo Electric Hardmetal Corp
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Priority to JP2001328583A priority Critical patent/JP3851804B2/en
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Description

【０００１】
【発明の属する技術分野】
この発明は、切削ヘッドの全体を交換して寿命となった機能を再生する刃先交換式ドリルに関する。
【０００２】
【従来の技術】
一般的なツイストドリルは、ねじれ角が３０°に設定されており、切れ刃のアキシャルレーキが外端の３０°を最大としてドリル中心側に行くにつれて次第に小さくなっている。
【０００３】
切れ刃の切れ味はアキシャルレーキが小さくなるほど低下し、従って、ドリル中心側の切れ刃の切れ味を良くしようとするならば、ねじれ角を大きくするなどの工夫が必要になる。
【０００４】
ところが、ねじれ角を大きくするとドリルの強度低下や切屑排出性の悪化が起こる。
【０００５】
一方、シンニング処理で切れ刃の全域のアキシャルレーキを一定させる技術があり、この方法によればねじれ角を大きくせずにドリル中心側切れ刃の切れ味を高めることができる。特公昭６２−６９２９号、特公昭５９−３９２４５号等はその方法で一定のアキシャルレーキを付与しているが、前者の公報が述べている＋３°、後者の公報が述べている＋３°〜＋１５°のアキシャルレーキでは仕事量の多い外周側切れ刃のアキシャルレーキが小さ過ぎて全体的な切削抵抗を大きく下げることができない。
【０００６】
また、特公昭６２−６９２９号は、シンニング部が切屑の切断にも効果を奏すると述べているが、平坦なシンニング面では切屑処理性の飛躍的な向上は望めない。
【０００７】
切屑排出性については、特開平０３−１４２１１７号、特開平０３−１４２１１８号の各公報に示されるような改善策がある。これ等の公報に示されるドリルは、切屑排出溝を、工具先端から基端側に向かって連続的にねじれ角が減少するねじれ部と、軸線と平行な直線部とで構成して排出溝の全長を短縮し、また、直線部の溝幅比をねじれ部よりも一様に大きくし、或いは直線部の溝幅を基端側に向かうほど拡大することで切屑の排出抵抗を下げている。
【０００８】
しかしながら、切屑は溝底と加工穴の内面とにこすれ合って流出し、排出溝のねじれ角や溝幅を徐々に変化させるだけではその現象が解消されないため、穴深さがドリル径の５倍を超える深穴加工では特に、切屑詰まりの問題を解決できない。
【０００９】
この発明は、上記の不具合を無くしてドリルの性能、寿命等を向上させることを課題としている。
【００１０】
【課題を解決するための手段】
上記の課題を解決するため、この発明においては、切れ刃を有する切削ヘッドを工具本体の先端に着脱自在に取り付けた刃先交換式ツイストドリルに、以下に列挙する構成を加える。
（１）切削ヘッドのねじれ角を２０°〜４０°とし、かつ、工具本体のねじれ角を切削ヘッドのねじれ角よりも小さくする。
（２）工具本体のねじれ溝の先端溝面位置を切削へッドのねじれ溝の後端溝面位置よりも低くし、溝幅比は切削ヘッド側が０．５：１〜０．８：１、工具本体側が０．６：１〜１．０：１で切削ヘッドの溝幅が工具本体の溝幅よりも小さいものにする。
（３）工具本体に、ねじれ角がシャンク側に向かって徐々に小さくなりねじれ溝の溝幅は徐々に大きくなるねじれ角、溝幅変化部を部分的に設け、かつ、工具本体の芯厚を先端からシャンク側に向かって徐々に小さくする。
（４）切削ヘッド及び工具本体に形成されるねじれ溝の溝面の面粗さを、Ｒａ２μｍ以下にする。
（５）工具本体の２箇所のランド部の各々に、外径がドリル径よりも０．０１〜０．１ｍｍ小さく、硬度がＨＲＣ５５以上のガイド部を、ドリルの回転方向前方のねじれ溝と回転方向後方のねじれ溝に沿って各２条設ける。
（６）切削ヘッド先端の切れ刃に２０°〜４０°の範囲の一定すくい角を付与するすくい面を設け、さらに、そのすくい面の終端のねじれ溝への切れ上がり部でチップブレーカを形成する。
【００１１】
なお、上記の各構成は単独で採用してもよいし、任意の２以上の構成を組み合わせて用いてもよい。それぞれの構成の作用、効果は次項で述べる。
【００１２】
【発明の実施の形態】
以下、この発明の実施の形態を添付図に基づいて説明する。
【００１３】
図１は、上記（１）の構成を採用した刃先交換式ドリルである。このドリルは、超硬合金等で形成される切削ヘッド１を工具本体２の先端に締結ボルト３で着脱自在に取り付けている。
【００１４】
切削ヘッド１は、中心対称の２枚の切れ刃４と、２条のねじれ溝５とマージン部６を有し、工具本体２は、切削ヘッド１の各ねじれ溝５に連なるねじれ溝７を有している。
【００１５】
また、切削ヘッド１と工具本体２は、突き合わせ部に断面Ｖ字状の凸部８、９とそれに対応させた凹部１０、１１を放射状配置にして設け、それ等を嵌合させてトルク伝達を行うようにしている。凸部８は外端から内端に向かってその高さを次第に低くしており、稜線が凹形円錐面上にある。凸部９もその高さを外端から内端に向かって次第に低くしているが、この凸部９の稜線はドリルの軸心と直角な面上にある。こうすると、切削ヘッド１と工具本体２が円錐嵌合して心出し効果も得られるが、嵌合部の構造は例示のものに限定されない。
【００１６】
この図１のドリルは、切削ヘッド１のねじれ角βを２０°〜４０°の範囲に設定し、工具本体２のねじれ角β１をβよりも小さくしている。
【００１７】
このように、切削ヘッド１を強ねじれにすることで切れ刃の切れ味が向上し、切削抵抗や刃先温度が下がり、刃先摩耗が減って切削ヘッドの寿命が延びる。その一方で、工具本体２はねじれ角を小さくして剛性を高めることができ、また、工具本体のねじれ角β１を小さくすることで切屑排出の道程が短くなって切屑排出性も向上する。
【００１８】
図２は、上記（２）の構成を採用したドリルである。このドリルは、図２（ｂ）に示すように、ねじれ溝７の先端溝面位置をねじれ溝５の後端溝面位置よりも低くしている。また、ねじれ溝５の溝幅比を０．５：１〜０．８：１、ねじれ溝７の溝幅比を０．６：１〜１．０：１に各々設定して切削ヘッド１側の溝幅Ｗを工具本体２の溝幅Ｗ1 よりも小さくしている。この点と、切削ヘッドと工具本体のねじれ角を等しくした点を除く構成は図１のドリルと同じである。
【００１９】
この図２のドリルは、切削ヘッド１と工具本体２の接続部における切屑の引っ掛かりが溝面の落ち込みによって防止され、また、ねじれ溝の溝幅が工具本体２側で広くなっているので切屑の流れも良くなり、切屑排出性が向上する。
【００２０】
図３は、上記（３）の構成を採用したドリルである。このドリルは、ねじれ角がＢ点即ちシャンク１２側に向かって徐々に小さくなり、ねじれ溝７の溝幅Ｗ1 はＡ点からＢ点向かって徐々に大きくなるねじれ角、溝幅変化部１３を工具本体２の一部分に設け（１４、１５はねじれ角、溝幅一定部）、さらに、工具本体の芯厚ＴをＡ点からＢ点に向かって徐々に小さくしている。
【００２１】
このドリルは、工具本体のねじれ角変化により切屑流出の道程が短くなる。これに加え、シャンク側に向かって溝幅が徐々に拡大し、ねじれ溝７は芯厚減少により徐々に深くなっていくので、溝幅のみを広げたものよりも切屑の流出抵抗が小さくなり、切屑排出性が大きく向上する。
【００２２】
図４は、上記（５）の構成を採用したドリルである。このドリルは、工具本体２の２箇所のランド部に、ガイド部となるマージン部１６を各２条設けている。ドリルの回転方向前後のねじれ溝に沿わせたそのマージン部１６は、外径をドリル径よりも０．０１〜０．１ｍｍ小さくし、また、ＨＲＣ５５以上、より好ましくはＨＲＣ６０以上の硬度をもたせている。
【００２３】
ロングドリルによる深穴加工では、ドリル径に対し、工具本体の外周が大きく逃げていると加工中に本体が撓み、穴曲がりが発生し易くなるので、各ランド部にガイド部１６（マージン部）をそれぞれ２箇所設けており、そのガイド部で本体の撓みを止めて穴曲がりを防止することができる。また、充分な硬度をもたせることでガイド部の耐摩耗性を高めているので、工具本体の寿命も延びる。
【００２４】
図５は、上記（６）の構成を採用したドリルである。このドリルは、シンニング処理によるすくい面１７を設けて切れ刃４のすくい角γを２０°〜４０°の範囲の一定値にしており、ドリル中心付近でも切れ刃の切れ味が向上し、切削抵抗が小さくなる。そのために、被削材や加工設備の剛性が低くても安定した穴加工が行え、ドリルの使用規制が緩和される。また、すくい面１７をねじれ溝５に切れ上がらせて切れ上がり部でチップブレーカ１８を成形しており、生成された切屑がそのブレーカによって分断されて切屑詰まりが起こり難くなる。
【００２５】
切れ刃チップやヘッド部を鑞付けする付刃ドリルや先むくドリルは、チップブレーカを設けると刃先からチップブレーカまでの距離を維持するために再研削を行えなくなるが、刃先交換式ドリルは、切削ヘッドを使い捨てするので、チップブレーカを設けても何ら支障は生じない。
【００２６】
なお、図１〜図５の構成は、それ等を適当に組み合わせて採用することができる。また、いずれのドリルも、ねじれ溝５、７の溝面の面粗さをＲａ２μｍ以下にすると、溝面との摩擦による切屑の排出抵抗が小さくなり、戻り切削油による強制排出効果が得られないミストクーラント加工やドライ加工でも切屑の排出がスムーズになる。
【００２７】
【発明の効果】
以上述べたように、この発明のドリルは、切れ味向上による切削抵抗低減、本体の剛性確保、切屑の道程短縮、排出抵抗低減、深穴加工での直進性向上、切屑の強制分断等の工夫を凝らしており、切屑詰まりや刃先摩耗等が起こり難く、深穴加工や被削材、加工設備の剛性が低い場合の加工において従来ドリルに勝る性能と寿命を発揮する。
【図面の簡単な説明】
【図１】（ａ）第１実施形態のドリルの側面図
（ｂ）同上のドリルの略９０°回転した位置での側面図
（ｃ）同じく正面図
【図２】（ａ）第２実施形態のドリルの側面図
（ｂ）工具本体の正面図
【図３】（ａ）第３実施形態のドリルの側面図
（ｂ）同上のドリルの工具本体の正面図
【図４】（ａ）第４実施形態のドリルの側面図
（ｂ）同上のドリルの工具本体の軸直角断面図
【図５】（ａ）第５実施形態のドリルの側面図
（ｂ）ａ図のＸ−Ｘ線部の断面図
【符号の説明】
１ 切削ヘッド
２ 工具本体
４ 切れ刃
５、７ ねじれ溝
６、１６ マージン部
１２ シャンク
１３ ねじれ角、溝幅変化部
１４、１５ ねじれ角、溝幅一定部
１７ すくい面
１８ チップブレーカ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blade-tip replaceable drill that regenerates a function that has reached the end of its life by replacing the entire cutting head.
[0002]
[Prior art]
In a general twist drill, the twist angle is set to 30 °, and the axial rake of the cutting edge gradually becomes smaller as it goes to the drill center side with 30 ° at the outer end as the maximum.
[0003]
The sharpness of the cutting edge decreases as the axial rake becomes smaller. Therefore, in order to improve the sharpness of the cutting edge on the center side of the drill, it is necessary to devise such as increasing the twist angle.
[0004]
However, when the helix angle is increased, the strength of the drill is reduced and the chip dischargeability is deteriorated.
[0005]
On the other hand, there is a technique for making the axial rake in the entire area of the cutting edge constant by a thinning process, and according to this method, the sharpness of the drill center side cutting edge can be enhanced without increasing the twist angle. Japanese Patent Publication No. 62-6929, Japanese Examined Publication No. 59-39245, and the like give a certain axial rake by the method, but the former publication describes + 3 °, and the latter publication describes + 3 ° to +15. With an axial rake of °, the axial rake on the outer peripheral cutting edge with a large amount of work is too small to reduce the overall cutting resistance greatly.
[0006]
Japanese Examined Patent Publication No. 62-6929 describes that the thinning portion also has an effect on cutting of chips, but a sharp improvement in chip disposal cannot be expected on a flat thinning surface.
[0007]
As for chip dischargeability, there are improvement measures as disclosed in JP-A-03-142117 and JP-A-03-142118. In the drills shown in these publications, the chip discharge groove is composed of a twisted portion in which the twist angle continuously decreases from the tool tip to the base end side, and a straight portion parallel to the axis. The chip discharge resistance is reduced by shortening the overall length, and increasing the groove width ratio of the straight line portion more uniformly than the twisted portion, or increasing the groove width of the straight line portion toward the base end side.
[0008]
However, the chips rub against the groove bottom and the inner surface of the drilled hole and flow out, and the phenomenon cannot be resolved by simply changing the twist angle and groove width of the discharge groove, so the hole depth is 5 times the drill diameter. In particular, deep hole machining exceeding 1 can not solve the problem of chip clogging.
[0009]
An object of the present invention is to improve the performance and life of a drill by eliminating the above-mentioned problems.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, a configuration listed below is added to a blade tip replaceable twist drill in which a cutting head having a cutting edge is detachably attached to the tip of a tool body.
(1) The torsion angle of the cutting head is set to 20 ° to 40 °, and the torsion angle of the tool body is made smaller than the torsion angle of the cutting head.
(2) The tip groove surface position of the torsion groove of the tool body is made lower than the rear end groove surface position of the torsion groove of the cutting head, and the groove width ratio is 0.5: 1 to 0.8: 1 on the cutting head side. The tool body side is 0.6: 1 to 1.0: 1 and the groove width of the cutting head is smaller than the groove width of the tool body.
(3) The tool body is partially provided with a twist angle and groove width changing portion where the twist angle gradually decreases toward the shank and the groove width of the twist groove gradually increases, and the core thickness of the tool body is reduced. Reduce gradually from the tip toward the shank.
(4) The surface roughness of the torsion grooves formed in the cutting head and the tool body is set to Ra 2 μm or less.
(5) A guide portion having an outer diameter of 0.01 to 0.1 mm smaller than the drill diameter and a hardness of HRC55 or more is rotated on each of the two land portions of the tool body with a twist groove at the front of the rotation direction of the drill. Two strips are provided along the twist groove at the rear of the direction.
(6) A rake face that provides a constant rake angle in the range of 20 ° to 40 ° is provided on the cutting edge at the tip of the cutting head, and a chip breaker is formed at the cut-up portion of the rake face at the end of the rake face. .
[0011]
In addition, said each structure may be employ | adopted independently and may be used combining arbitrary 2 or more structures. The operation and effect of each configuration will be described in the next section.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0013]
FIG. 1 is a blade-tip-replaceable drill that employs the configuration (1). In this drill, a cutting head 1 formed of cemented carbide or the like is detachably attached to a tip end of a tool body 2 with fastening bolts 3.
[0014]
The cutting head 1 has two center-symmetric cutting edges 4, two twisted grooves 5, and a margin portion 6, and the tool body 2 has twisted grooves 7 connected to the respective twisted grooves 5 of the cutting head 1. is doing.
[0015]
Further, the cutting head 1 and the tool main body 2 are provided with convex portions 8 and 9 having a V-shaped cross section and concave portions 10 and 11 corresponding to the radial portions at the abutting portions, and these are fitted to transmit torque. Like to do. The convex portion 8 gradually decreases in height from the outer end toward the inner end, and the ridge line is on the concave conical surface. The height of the convex portion 9 is gradually lowered from the outer end toward the inner end, but the ridge line of the convex portion 9 is on a plane perpendicular to the axis of the drill. In this case, the cutting head 1 and the tool body 2 are conically fitted to obtain a centering effect, but the structure of the fitting portion is not limited to the illustrated one.
[0016]
In the drill of FIG. 1, the twist angle β of the cutting head 1 is set in a range of 20 ° to 40 °, and the twist angle β1 of the tool body 2 is made smaller than β.
[0017]
Thus, by making the cutting head 1 torsional, the sharpness of the cutting edge is improved, cutting resistance and cutting edge temperature are reduced, cutting edge wear is reduced, and the life of the cutting head is extended. On the other hand, the tool body 2 can reduce the torsion angle and increase the rigidity, and by reducing the torsion angle β1 of the tool body, the chip discharge path is shortened and the chip discharge performance is improved.
[0018]
FIG. 2 shows a drill that employs the configuration (2). In this drill, as shown in FIG. 2 (b), the position of the front end groove surface of the twisted groove 7 is made lower than the position of the rear end groove surface of the twisted groove 5. Further, the groove width ratio of the torsion grooves 5 is set to 0.5: 1 to 0.8: 1, and the groove width ratio of the torsion grooves 7 is set to 0.6: 1 to 1.0: 1. The groove width W is smaller than the groove width W 1 of the tool body 2. Except for this point and the fact that the twist angles of the cutting head and the tool body are equal, the configuration is the same as that of the drill of FIG.
[0019]
In the drill shown in FIG. 2, chips are prevented from being caught in the connecting portion between the cutting head 1 and the tool body 2, and the groove width of the torsion groove is widened on the tool body 2 side. The flow is improved and the chip discharge is improved.
[0020]
FIG. 3 shows a drill that employs the configuration (3). In this drill, the twist angle gradually decreases toward the point B, that is, the shank 12 side, and the groove width W 1 of the twist groove 7 gradually increases from the point A to the point B. It is provided in a part of the tool body 2 (14 and 15 are torsion angles and constant groove width portions), and the core thickness T of the tool body is gradually reduced from point A to point B.
[0021]
This drill has a short chip discharge path due to a change in the twist angle of the tool body. In addition to this, the groove width gradually increases toward the shank side, and the twisted groove 7 gradually becomes deeper due to the decrease in the core thickness, so that the outflow resistance of chips becomes smaller than that in which only the groove width is expanded, Chip discharge is greatly improved.
[0022]
FIG. 4 shows a drill that employs the configuration (5). This drill is provided with two margin portions 16 each serving as a guide portion at two land portions of the tool body 2. The margin 16 along the twisted grooves before and after the rotation direction of the drill has an outer diameter 0.01 to 0.1 mm smaller than the drill diameter, and has a hardness of HRC 55 or more, more preferably HRC 60 or more. Yes.
[0023]
In deep hole drilling with long drills, if the outer circumference of the tool body is greatly displaced relative to the drill diameter, the body will bend during processing and hole bending will easily occur. Are provided at two locations, and the bending of the main body can be stopped by the guide portion to prevent the bending of the hole. Further, since the wear resistance of the guide portion is enhanced by giving sufficient hardness, the life of the tool body is extended.
[0024]
FIG. 5 shows a drill that employs the above-described configuration (6). This drill is provided with a rake face 17 by a thinning process, and the rake angle γ of the cutting edge 4 is set to a constant value in the range of 20 ° to 40 °. The sharpness of the cutting edge is improved near the center of the drill, and the cutting resistance is reduced. Get smaller. Therefore, stable drilling can be performed even if the work material and processing equipment have low rigidity, and the use restriction of the drill is relaxed. The rake face 17 is cut into the twisted groove 5 and the chip breaker 18 is formed at the raised portion. The generated chips are divided by the breaker, and chip clogging is less likely to occur.
[0025]
With a cutting edge tip and a tip drill that brazes the cutting edge tip and the head part, if a tip breaker is provided, re-grinding cannot be performed to maintain the distance from the cutting edge to the tip breaker. Since the head is disposable, there is no problem even if a chip breaker is provided.
[0026]
1 to 5 can be adopted by appropriately combining them. Further, in any drill, when the surface roughness of the groove surfaces of the torsion grooves 5 and 7 is set to Ra 2 μm or less, the chip discharge resistance due to friction with the groove surface is reduced, and the forced discharge effect by the return cutting oil cannot be obtained. Chip discharge is smooth even in mist coolant processing and dry processing.
[0027]
【The invention's effect】
As described above, the drill of the present invention is designed to reduce cutting resistance by improving sharpness, ensure the rigidity of the main body, shorten the chip path, reduce discharge resistance, improve straightness in deep hole drilling, and forcibly cut chips. It is hard and does not cause chip clogging or cutting edge wear, and demonstrates performance and life superior to that of conventional drills in deep hole machining, work materials, and machining when the rigidity of machining equipment is low.
[Brief description of the drawings]
1A is a side view of a drill according to a first embodiment, FIG. 1B is a side view of the same drill at a position rotated by approximately 90 °, and FIG. 1C is a front view. FIG. 2A is a second embodiment. (B) Front view of the tool main body [FIG. 3] (a) Side view of the drill according to the third embodiment (b) Front view of the tool main body of the above drill [FIG. 4] (a) Fourth view Side view of drill of embodiment (b) Cross-sectional view perpendicular to axis of tool body of drill same as above [Fig. 5] (a) Side view of drill of fifth embodiment (b) Section of line XX in Fig. A Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutting head 2 Tool body 4 Cutting edge 5, 7 Torsion groove 6, 16 Margin part 12 Shank 13 Twist angle, groove width change part 14, 15 Twist angle, groove width constant part 17 Rake face 18 Chip breaker

Claims (6)

切れ刃を有する切削ヘッドを工具本体の先端に着脱自在に取り付けた刃先交換式ツイストドリルにおいて、切削ヘッドのねじれ角を２０°〜４０°とし、かつ、工具本体のねじれ角を、切削ヘッドのねじれ角に対して工具本体の先端で角度を変化させて切削ヘッドのねじれ角よりも小さくすると共に、工具本体のねじれ溝の先端溝面位置を切削ヘッドのねじれ溝の後端溝面位置よりも低くしたことを特徴とする刃先交換式ツイストドリル。In a blade-tip replaceable twist drill in which a cutting head having a cutting edge is detachably attached to the tip of a tool body, the twist angle of the cutting head is set to 20 ° to 40 °, and the twist angle of the tool body is set to be a twist of the cutting head. Change the angle at the tip of the tool body relative to the angle to make it smaller than the torsion angle of the cutting head, and make the tip groove surface position of the torsion groove of the tool body lower than the position of the rear end groove surface of the torsion groove of the cutting head. A blade-exchange-type twist drill characterized by 切削ヘッドの溝幅比が０．５：１〜０．８：１、工具本体の溝幅比が０．６：１〜１．０：１で切削ヘッドの溝幅が工具本体の溝幅よりも小さいことを特徴とする請求項１に記載の刃先交換式ツイストドリル。  The groove width ratio of the cutting head is 0.5: 1 to 0.8: 1, the groove width ratio of the tool body is 0.6: 1 to 1.0: 1, and the groove width of the cutting head is larger than the groove width of the tool body. The blade tip replaceable twist drill according to claim 1, wherein the twist tip drill is also small. 工具本体に、ねじれ角がシャンク側に向かって徐々に小さくなりねじれ溝の溝幅は徐々に大きくなるねじれ角、溝幅変化部を部分的に設け、かつ、工具本体の芯厚を先端からシャンク側に向かって徐々に小さくしたことを特徴とする請求項１に記載の刃先交換式ツイストドリル。  The tool body is partially provided with a torsion angle and groove width changing portion where the torsion angle gradually decreases toward the shank and the torsion groove gradually increases, and the core thickness of the tool body is shank from the tip. The blade tip replaceable twist drill according to claim 1, wherein the twist drill is gradually reduced toward the side. 切削ヘッド及び工具本体に形成されるねじれ溝の溝面の面粗さを、Ｒａ２μｍ以下にしたことを特徴とする請求項１に記載の刃先交換式ツイストドリル。  The blade tip exchange type twist drill according to claim 1, wherein the surface roughness of the groove surface of the torsion groove formed in the cutting head and the tool body is set to Ra 2 μm or less. 工具本体に設けられる２箇所のランド部の各々に、外径がドリル径よりも０．０１〜０．１ｍｍ小さく、硬度がＨＲＣ５５以上のガイド部を、ドリルの回転方向前方のねじれ溝と回転方向後方のねじれ溝に沿って各２条設けたことを特徴とする請求項１に記載の刃先交換式ツイストドリル。  In each of the two land portions provided on the tool body, a guide portion having an outer diameter smaller than the drill diameter by 0.01 to 0.1 mm and a hardness of HRC55 or more is provided with a twist groove and a rotation direction in front of the drill rotation direction. The blade tip replaceable twist drill according to claim 1, wherein two strips are provided along the rear twist groove. 切削ヘッド先端の切れ刃に２０°〜４０°の範囲の一定すくい角を付与するすくい面を設け、さらに、そのすくい面の終端のねじれ溝への切れ上がり部でチップブレーカを形成したことを特徴とする請求項１に記載の刃先交換式ツイストドリル。  The cutting edge at the tip of the cutting head is provided with a rake face that gives a constant rake angle in the range of 20 ° to 40 °, and a chip breaker is formed at the end of the rake face to the twisted groove. The blade tip replaceable twist drill according to claim 1.
JP2001328583A 2001-10-26 2001-10-26 Replaceable twist drill Expired - Lifetime JP3851804B2 (en)

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KR100932002B1 (en) * 2007-06-04 2009-12-15 유림전기(주) Router bits
CN102307693B (en) 2009-02-04 2013-07-31 Osg株式会社 Bevel head replacement rotary tool, tip head, and tool body
JP5846683B2 (en) * 2011-09-30 2016-01-20 住友電工ハードメタル株式会社 Drill for processing FRP and metal
CN102642041B (en) * 2011-12-01 2014-11-26 贵州西南工具(集团)有限公司 Method and double-horn drill bit for reducing cutting resistance of drill bit
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