JP2005205526A - Deep hole boring tool - Google Patents

Deep hole boring tool Download PDF

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JP2005205526A
JP2005205526A JP2004013852A JP2004013852A JP2005205526A JP 2005205526 A JP2005205526 A JP 2005205526A JP 2004013852 A JP2004013852 A JP 2004013852A JP 2004013852 A JP2004013852 A JP 2004013852A JP 2005205526 A JP2005205526 A JP 2005205526A
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cutting edge
edge
outer peripheral
drill
angle
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Seiji Ohashi
誠司 大橋
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Nachi Fujikoshi Corp
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Nachi Fujikoshi Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To improve an inside cutting edge for reducing cutting resistance, since the cutting quality is not yet better to an outer peripheral side cutting edge 4 having a large positive rake angle γ, since a rake angle β of the inside cutting edge formed by cross-thinning is normally the 0° vicinity to the drill axis. <P>SOLUTION: In a twist drill 1 of applying the cross-thinning 3, this boring tool is set at 115 to 125° in an angle α formed by the inside cutting edge front edge formed by the cross-thinning, to a straight line passing through the tool axis 7, in parallel to a line for connecting the outer peripheral side cutting edge 4 front edge or the outer peripheral side cutting edge 41, 42 both ends 9 and 10, when viewed from the cutting edge front in the tool axis 7 direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、深穴用ドリルの寿命向上による穴加工コスト低減に資する穴明け工具に関する。   The present invention relates to a drilling tool that contributes to a reduction in drilling cost by improving the life of a deep hole drill.

従来、ツイスト溝を有する穴明け工具による鋼材の深穴加工において、切りくず排出円滑化のため溝面積を浅穴加工用に比し、拡大する事が必要であり設計的には溝幅比を大きくする。ただしこれは工具剛性の低下を招くので、通常は同時に心厚Ｗを増大して剛性を向上させる。しかし、心厚Ｗの増大は中心部にあり切れ味のごく悪いチゼル２の長さが大きくなるので、軸方向の荷重であるスラストが大きくなり、切れ刃の負担増大による摩耗増大および座屈によるドリル曲がりを招いた。   Conventionally, in deep hole machining of steel materials with a drilling tool having a twist groove, it is necessary to enlarge the groove area compared to shallow hole machining for smooth chip discharge, and the groove width ratio is designed in terms of design. Enlarge. However, this leads to a reduction in tool rigidity, and usually the core thickness W is increased simultaneously to improve the rigidity. However, since the length of the chisel 2 that is extremely sharp at the center is increased because the increase in the core thickness W is increased, the thrust that is the axial load is increased, the wear due to the increased load on the cutting edge, and the drill due to buckling. Invited a bend.

切れ味のごく悪いチゼルを小さくするため、各種のシンニング法が提案されている。なかでもクロスシンニング又はＸ形シンニングは広く使用されており、それに関する特許文献も多い。例えば特許文献１ではチゼルの幅を０．１〜０．２５ｍｍに規制し、特許文献２ではチゼル長さをドリル直径の０．０２〜０．０５倍に規制しており、特許文献３ではドリル先端部に形成された２次切れ刃のドリル中心側すくい角βを−５０〜−２度にするものであり、特許文献４では中心部を巴形にえぐる形状であり、特許文献５ではシンニング刃と切刃との交叉部に曲線を設け、その曲率半径をドリル直径の０．０５〜０．１５倍としたものである。
特開２００３−３９２２０号 特開平５−２５３７１９号公報 特開平１０−３１５０２１号公報 特許第３１６２３０９号 特許第２６７４１２３号 Various thinning methods have been proposed in order to reduce the sharpness of the chisel. Among them, cross thinning or X-type thinning is widely used, and there are many patent documents related to it. For example, in Patent Document 1, the width of the chisel is regulated to 0.1 to 0.25 mm, in Patent Document 2, the chisel length is regulated to 0.02 to 0.05 times the drill diameter, and in Patent Document 3, the drill is regulated. The rake angle β on the drill center side of the secondary cutting edge formed at the tip is set to −50 to −2 degrees. In Patent Document 4, the center is shaped like a bowl, and in Patent Document 5, thinning is performed. A curve is provided at the intersection of the blade and the cutting blade, and the radius of curvature is 0.05 to 0.15 times the drill diameter.
JP 2003-39220 A JP-A-5-253719 Japanese Patent Laid-Open No. 10-315021 Japanese Patent No. 3162309 Japanese Patent No. 2674123

本発明の課題は、ツイストドリルにおいて、これらとは別の部位を変更してクロスシンニングを改良しようとするものである。クロスシンニングを施すことによりシンニングなしの場合に比し切削スラストは大幅に減少するが、クロスシンニングにより形成された内側切れ刃のすくい角βはドリル中心軸に対し通常０°付近であるため、大きな正のすくい角γを有している外周側切れ刃４に対し、やはり切れ味は良いとはいえない。切削抵抗軽減のためには内側切れ刃の改良が必要である。   An object of the present invention is to improve cross-thinning in a twist drill by changing a part other than these parts. By applying cross thinning, the cutting thrust is greatly reduced as compared to the case without thinning, but the rake angle β of the inner cutting edge formed by cross thinning is usually around 0 ° with respect to the drill center axis, so it is large. The sharpness of the outer peripheral cutting edge 4 having a positive rake angle γ is still not good. In order to reduce cutting resistance, it is necessary to improve the inner cutting edge.

このため本発明は、クロスシンニングの施されたツイストドリルにおいて、工具軸心方向で切れ刃正面からみて外周側の切れ刃前縁又は外周側の切れ刃両端を結ぶ線に平行し、かつ工具軸心を通る直線に対し、クロスシンニングにより形成された内側切れ刃前縁のなす角度αが１１５〜１２５°であることを特徴とする穴明け工具によって上記した課題を解決した。   Therefore, the present invention relates to a cross drilled twist drill that is parallel to a line connecting the leading edge of the outer peripheral edge or both ends of the outer peripheral edge when viewed from the front of the cutting edge in the tool axis direction, and the tool axis. The above-mentioned problems have been solved by a drilling tool characterized in that the angle α formed by the inner edge of the inner cutting edge formed by cross thinning is 115 to 125 ° with respect to a straight line passing through the center.

本発明は剛性向上のため心厚Ｗを大きく取らざるを得ない深穴用ツイストドリルにおいて、クロスシンニングによりドリル中心側に形成される内側切れ刃が外周側の切れ刃前縁又は外周側の切れ刃両端を結ぶ線とのなす角度αは、ドリル先端正面からみて、従来品がほぼ１３０〜１４０°であったのを、本発明品では１１５〜１２５°の範囲に刃先を形成するものである。これにより、ドリル中心軸に対しすくい角βが通常０°付近であるため切れ味が悪い内側切れ刃の長さが短縮され、切削抵抗が減少した穴明け工具を提供するものとなった。   The present invention relates to a deep hole twist drill in which the core thickness W must be increased to improve rigidity, and the inner cutting edge formed on the drill center side by cross thinning is the outer cutting edge leading edge or the outer cutting edge. The angle α formed with the line connecting both ends of the blade is that the conventional product is approximately 130 to 140 ° when viewed from the front of the drill tip, but the present invention product forms a blade edge in the range of 115 to 125 °. . As a result, the rake angle β with respect to the center axis of the drill is usually around 0 °, so that the length of the inner cutting edge with poor sharpness is shortened, and a drilling tool with reduced cutting resistance is provided.

内側切れ刃と、外周側の切れ刃前縁又は外周側の切れ刃両端を結ぶ線とがなす角度αが１１５°未満であるときは、被削材が合金鋼や炭素鋼の場合切り屑流出方向がドリル外周側に偏寄し却って排出性が悪化し、角度αが１２５°を越えると、切れ味が悪い内側切れ刃の長さの短縮が不十分となり、本発明の効果が不十分となるので、角度αを１１５〜１２５°に限定した。   When the angle α formed between the inner cutting edge and the line connecting the leading edge of the outer peripheral side or both ends of the outer peripheral cutting edge is less than 115 °, the chip flows if the work material is alloy steel or carbon steel. If the direction is biased toward the outer periphery of the drill and the discharge performance is deteriorated, and the angle α exceeds 125 °, the shortening of the length of the inner cutting edge with poor sharpness becomes insufficient, and the effect of the present invention becomes insufficient. Therefore, the angle α was limited to 115 to 125 °.

好ましくは、前記切れ刃正面からみて外周側の切れ刃前縁又は外周側の切れ刃両端を結ぶ線に平行し、かつ工具軸心を通る直線に対し、クロスシンニングにより形成された内側切れ刃前縁のなす角度αが１１５〜１２０°であることがより本発明の効果を発揮する。 さらに好ましくは、深穴用ツイストドリルにおいては溝部心厚が極めて重要であり、前記穴明け工具の直径をＤとしたとき、溝部心厚が０．３５〜０．４５Ｄを有することが好ましい。溝部心厚が０．３５Ｄ未満では剛性が不足し、０．４５Ｄを越えると溝が浅くなり、切り屑の排出性が悪化するからである。
また、前記穴明け工具の軸心に対し、ツイスト溝のねじれ角が３３〜４２°を有することが好ましい。ねじれ角が３３°未満では切り屑の排出性が悪化し、４２°を越えると剛性が不足するからである。 Preferably, when viewed from the front of the cutting edge, the front side of the inner cutting edge formed by cross thinning with respect to a straight line parallel to a line connecting the leading edge of the outer peripheral side or both ends of the outer peripheral cutting edge and passing through the tool axis. The effect of the present invention is more exhibited when the angle α formed by the edge is 115 to 120 °. More preferably, in the deep hole twist drill, the groove core thickness is extremely important, and when the diameter of the drilling tool is D, the groove core thickness is preferably 0.35 to 0.45D. This is because if the groove core thickness is less than 0.35D, the rigidity is insufficient, and if it exceeds 0.45D, the groove becomes shallow and the chip discharging property deteriorates.
Moreover, it is preferable that the twist angle of a twist groove has 33-42 degrees with respect to the axial center of the said drilling tool. This is because if the twist angle is less than 33 °, the chip discharging property deteriorates, and if it exceeds 42 °, the rigidity is insufficient.

本発明を実施するための最良の形態を、図面を参照して説明する。図１は本発明の最良の実施形態のクロスシンニングの施されたツイストドリルを工具軸心方向で切れ刃正面からみた正面図を示し、本発明の穴明け工具は、クロスシンニング３の施されたツイストドリル１において、工具軸心７方向で切れ刃正面からみて、外周側の切れ刃４前縁に平行し、かつ工具軸心７を通る直線に対し、クロスシンニング３により形成された内側切れ刃前縁のなす角度αが１１５〜１２５°であることを特徴とする穴明け工具である。２はチゼル、６は外周側の切れ刃４の逃げ面、８は溝、９は外周側の切れ刃４の外方端面、１０は外周側の切れ刃４の内方端面である。   The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a front view of a twist drill subjected to cross thinning according to the best embodiment of the present invention as viewed from the front of the cutting edge in the tool axis direction. The drilling tool of the present invention is subjected to cross thinning 3. In the twist drill 1, the inner cutting edge formed by the cross thinning 3 with respect to a straight line parallel to the front edge of the cutting edge 4 on the outer peripheral side and passing through the tool axis 7 when viewed from the front of the cutting edge in the direction of the tool axis 7. The drilling tool is characterized in that the angle α formed by the leading edge is 115 to 125 °. 2 is a chisel, 6 is a clearance surface of the outer peripheral cutting edge 4, 8 is a groove, 9 is an outer end face of the outer peripheral cutting edge 4, and 10 is an inner end face of the outer peripheral cutting edge 4.

図２は、図１のドリル１を溝側面からみた側面図である。ドリル軸心７に対しすくい角βは図２に示すように、通常０°付近であるため、内側切れ刃５の切れ味が悪い。本発明では、外周側の切れ刃４前縁に平行し、かつ工具軸心７を通る直線に対し、クロスシンニングにより形成された内側切れ刃前縁のなす角度αを１１５〜１２５°とすることにより、内側切れ刃５長さが短縮され、切削抵抗が減少した穴明け工具を提供するものとなった。図３は図１のドリル１の外周側の切れ刃前縁にそう方向でドリル側面からみた外周側の切れ刃５前縁拡大側面図を示す。図３に示すように、図１のドリル１の外周側の切れ刃４前縁は、工具軸心７に対し大きいすくい角γを有する。   FIG. 2 is a side view of the drill 1 of FIG. 1 as viewed from the side of the groove. As shown in FIG. 2, the rake angle β with respect to the drill axis 7 is normally near 0 °, and the sharpness of the inner cutting edge 5 is poor. In the present invention, the angle α formed by the inner cutting edge leading edge formed by cross thinning is 115 to 125 ° with respect to a straight line parallel to the leading edge of the outer cutting edge 4 and passing through the tool axis 7. Thus, the length of the inner cutting edge 5 is shortened, and a drilling tool with reduced cutting resistance is provided. FIG. 3 shows an enlarged side view of the front edge of the outer peripheral cutting edge 5 as viewed from the side of the drill in such a direction as to the front edge of the outer peripheral edge of the drill 1 of FIG. As shown in FIG. 3, the front edge of the cutting edge 4 on the outer peripheral side of the drill 1 of FIG. 1 has a large rake angle γ with respect to the tool axis 7.

図４は図１とは異なる本発明の最良の実施形態のクロスシンニングの施されたツイストドリル１１を工具軸心方向で切れ刃正面からみた正面図を示す。図４に示すように、工具軸心方向で切れ刃正面からみて外周側の切れ刃４１両端９、１０を結ぶ線に平行し、かつ工具軸心７を通る直線に対し、クロスシンニング３により形成された内周側の切れ刃５前縁とのなす角度αが１１５〜１２５°にされている。図５は図１、図４とはさらに異なる本発明の最良の実施形態のクロスシンニングの施されたツイストドリル１２を工具軸心方向で切れ刃正面からみた正面図を示す。図５に示すように、工具軸心方向で切れ刃正面からみて外周側の切れ刃４２両端９、１０を結ぶ線に平行し、かつ工具軸心７を通る直線に対し、クロスシンニング３により形成された内周側の切れ刃５前縁とのなす角度αが１１５〜１２５°にされている。図４の外周側の切れ刃４１は中央が後退する曲線状をなし、図５の外周側の切れ刃４２は中央が突出する曲線状をなすが、いずれも図１の直線状の外周側の切れ刃４前縁と同じ本発明の効果を奏する。   FIG. 4 is a front view of a twist drill 11 subjected to cross thinning according to the preferred embodiment of the present invention, which is different from FIG. 1, as viewed from the front of the cutting edge in the tool axis direction. As shown in FIG. 4, it is formed by cross thinning 3 on a straight line passing through the tool axis 7 in parallel to the line connecting the both ends 9 and 10 of the outer peripheral edge 41 when viewed from the front of the cutting edge in the tool axis direction. The angle α formed with the leading edge of the inner peripheral cutting edge 5 is set to 115 to 125 °. FIG. 5 shows a front view of a twist drill 12 subjected to cross thinning according to a preferred embodiment of the present invention, which is further different from FIGS. 1 and 4, as viewed from the front of the cutting edge in the tool axis direction. As shown in FIG. 5, it is formed by cross thinning 3 on a straight line passing through the tool axis 7 in parallel to the line connecting the both ends 9 and 10 of the outer peripheral edge 42 when viewed from the front of the cutting edge in the tool axis direction. The angle α formed with the leading edge of the inner peripheral cutting edge 5 is set to 115 to 125 °. The cutting edge 41 on the outer peripheral side in FIG. 4 has a curved shape with the center retreating, and the cutting edge 42 on the outer peripheral side in FIG. 5 has a curved shape with the center protruding, both of which are on the linear outer peripheral side in FIG. The same effect of the present invention as that of the leading edge of the cutting edge 4 is obtained.

図１に示す本発明のＴｉＡｌＮ系コーティングを施したハイスロングドリルで深穴加工実験を行った。ドリル寸法は直径６．０ｍｍ、全長２１３ｍｍ、溝長１２０ｍｍ、ねじれ角４０°、心厚Ｗは直径の４５％である。このドリルを用いてクロスシンニングの内側切れ刃５と外周側切れ刃４の成す角度αを本発明品は１２０°に、比較の従来品の角度αは１３５°に、それぞれ先研ぎして実験した。加工条件は次のようである。
ドリル直径：６．０ｍｍ
被削材：Ｓ５０Ｃ
穴深さ：１００ｍｍ
切削速度：１５ｍ／ｍｉｎ
送り速度：１２０ｍｍ／ｍｉｎ
切削油剤：水溶性 A deep hole drilling experiment was conducted using a high-shear drill with a TiAlN coating according to the present invention shown in FIG. The drill size is 6.0 mm in diameter, 213 mm in total length, 120 mm in groove length, 40 ° twist angle, and the core thickness W is 45% of the diameter. Using this drill, the angle α formed by the inner thin cutting edge 5 and the outer peripheral cutting edge 4 of the cross thinning was sharpened to 120 ° for the product of the present invention, and the angle α of the comparative conventional product was sharpened to 135 ° for the experiment. . The processing conditions are as follows.
Drill diameter: 6.0mm
Work material: S50C
Hole depth: 100mm
Cutting speed: 15 m / min
Feeding speed: 120mm / min
Cutting fluid: water-soluble

切削試験により得られたスラスト切削抵抗測定値を表１に、切削試験のドリル摩耗幅測定値を表２に示す。角度αはクロスシンニングの内側切れ刃と外周側切れ刃の成すクロスシンニングにより成す角度である。切削試験の平均スラスト切削抵抗は従来品に対し、本発明品は約３０％の減少があった。なお平均トルクはほぼ同等であった。切削試験のドリル摩耗幅測定値は穴明け数７８穴で本発明品は約１／３以下に激減した。従来品は７８穴加工の時点で寿命と判定されたが、本発明品はさらに継続使用が可能であった。   Table 1 shows measured values of thrust cutting resistance obtained by the cutting test, and Table 2 shows measured values of wear width of the drill in the cutting test. The angle α is an angle formed by cross thinning formed by the inner cutting edge and the outer peripheral cutting edge of the cross thinning. The average thrust cutting resistance of the cutting test was about 30% less than that of the conventional product. The average torque was almost the same. The measured value of the wear width of the drill in the cutting test was 78 holes, and the product of the present invention drastically decreased to about 1/3 or less. The conventional product was determined to have a lifetime at the time of 78 hole machining, but the product of the present invention could be further used continuously.

Figure 2005205526
切削試験のスラスト切削抵抗測定値

Figure 2005205526
 切削試験のドリル摩耗幅測定値

〔本発明の最良の実施形態の効果〕
Figure 2005205526
 Thrust cutting resistance measurement value of cutting test

Figure 2005205526
 Drill wear width measurement value of cutting test

[Effect of Best Embodiment of the Present Invention]

上記の本発明の最良の実施形態の穴明け工具は、剛性向上のため心厚Ｗを大きく取らざるを得ない深穴用ツイストドリルにおいて、クロスシンニングによりドリル中心側に形成される内側切れ刃が外周側の切れ刃前縁又は外周側の切れ刃両端を結ぶ線とのなす角度αは、ドリル先端正面からみて、従来品がほぼ１３０〜１４０°であったのを、本発明品では１１５〜１２５°の範囲に刃先を形成するものである。これにより、ドリル中心軸に対しすくい角βが通常０°付近であため切れ味が悪い内側切れ刃の長さが短縮され、切削スラストが低下し、切れ刃の負荷が軽減したことによりコーナ・逃げ面摩耗が減少した。またスラスト低下により座屈によるドリル曲がりが低減したことにより、穴内で穴壁との擦過が減少したことによりマージン摩耗は大幅に低下し、穴曲がり量も減少した。   The above-described drilling tool according to the best embodiment of the present invention is a deep hole twist drill in which the core thickness W has to be increased to improve rigidity, and the inner cutting edge formed on the drill center side by cross thinning is provided. The angle α between the front edge of the outer peripheral cutting edge or the line connecting both ends of the outer peripheral cutting edge is approximately 130 to 140 ° in the conventional product when viewed from the front of the drill tip. The cutting edge is formed in a range of 125 °. As a result, the rake angle β is usually around 0 ° with respect to the center axis of the drill, so the length of the inner cutting edge with poor sharpness is shortened, the cutting thrust is reduced, and the load on the cutting edge is reduced. Surface wear decreased. In addition, drill bending due to buckling was reduced due to lower thrust, and abrasion with the hole wall in the hole was reduced, so that margin wear was significantly reduced and the amount of hole bending was also reduced.

好ましくは、前記切れ刃正面からみて外周側の切れ刃前縁又は外周側の切れ刃両端を結ぶ線に平行し、かつ工具軸心を通る直線に対し、クロスシンニングにより形成された内側切れ刃前縁のなす角度αが１１５〜１２０°であることがより本発明の効果を発揮する。 さらに好ましくは、深穴用ツイストドリルにおいては溝部心厚が極めて重要であり、前記穴明け工具の直径をＤとしたとき、溝部心厚が０．３５〜０．４５Ｄを有することが好ましい。溝部心厚が０．３５Ｄ未満では剛性が不足し、０．４５Ｄを越えると溝が浅くなり、切り屑の排出性が悪化するからである。
また、前記穴明け工具軸心に対し、ツイスト溝のねじれ角が３３〜４２°を有することが好ましい。ねじれ角が３３°未満では切り屑の排出性が悪化し、４２°を越えると剛性が不足するからである。 Preferably, when viewed from the front of the cutting edge, the front side of the inner cutting edge formed by cross thinning with respect to a straight line parallel to a line connecting the leading edge of the outer peripheral side or both ends of the outer peripheral cutting edge and passing through the tool axis. The effect of the present invention is more exhibited when the angle α formed by the edge is 115 to 120 °. More preferably, in the deep hole twist drill, the groove core thickness is extremely important, and when the diameter of the drilling tool is D, the groove core thickness is preferably 0.35 to 0.45D. This is because if the groove core thickness is less than 0.35D, the rigidity is insufficient, and if it exceeds 0.45D, the groove becomes shallow and the chip discharging property deteriorates.
Moreover, it is preferable that the twist angle of a twist groove has 33-42 degrees with respect to the said drilling tool axial center. This is because if the twist angle is less than 33 °, the chip discharging property deteriorates, and if it exceeds 42 °, the rigidity is insufficient.

本発明の最良の実施形態のクロスシンニングの施されたツイストドリルを工具軸心方向で切れ刃正面からみた正面図。The front view which looked at the twist drill in which the cross thinning of the best embodiment of this invention was given from the cutting-blade front in the tool axis direction. 図１のドリルを溝側面からみた側面図。The side view which looked at the drill of FIG. 1 from the groove | channel side. 図１のドリルの外周側の切れ刃前縁にそう方向でドリル側面からみた外周側の切れ刃前縁拡大側面図。FIG. 2 is an enlarged side view of a cutting edge leading edge on the outer peripheral side viewed from the side of the drill in a direction toward the cutting edge leading edge on the outer peripheral side of the drill of FIG. 1. 図１とは異なる本発明の最良の実施形態のクロスシンニングの施されたツイストドリルを工具軸心方向で切れ刃正面からみた正面図。The front view which looked at the twist drill in which the cross thinning of the best embodiment of this invention different from FIG. 1 was given from the cutting-blade front in the tool axis direction. 図１、図４とはさらに異なる本発明の最良の実施形態のクロスシンニングの施されたツイストドリルを工具軸心方向で切れ刃正面からみた正面図。The front view which looked at the twist drill with which the cross thinning of the best embodiment of this invention different from FIG. 1, FIG. 4 was given from the cutting-blade front in the tool axis direction.

符号の説明Explanation of symbols

１：ドリル溝
２：チゼル
３：クロスシンニング
４、４１、４２：外周側切れ刃
５：内側切れ刃
６：ドリル逃げ面
７：軸中心線
Ｗ：心厚
α：内側切れ刃と外周側切れ刃のなす角度
β：内側切れ刃のすくい角
γ：外周側切れ刃のすくい角 1: Drill groove 2: Chisel 3: Cross thinning 4, 41, 42: Outer peripheral cutting edge 5: Inner cutting edge 6: Drill flank 7: Axis center line W: Center thickness α: Inner cutting edge and outer peripheral cutting edge Angle β: Rake angle of inner cutting edge γ: Rake angle of outer peripheral cutting edge

Claims (6)

クロスシンニングの施されたツイストドリルにおいて、工具軸心方向で切れ刃正面からみて外周側の切れ刃前縁又は外周側の切れ刃両端を結ぶ線に平行し、かつ工具軸心を通る直線に対し、クロスシンニングにより形成された内側切れ刃前縁のなす角度αが１１５〜１２５°であることを特徴とする穴明け工具。   For twist drills with cross thinning, with respect to the straight line passing through the tool axis and parallel to the line connecting the leading edge of the outer peripheral edge or both ends of the outer peripheral edge when viewed from the front of the cutting edge in the tool axis direction An angle α formed by the leading edge of the inner cutting edge formed by cross thinning is 115 to 125 °. 前記切れ刃正面からみて外周側の切れ刃前縁又は外周側の切れ刃両端を結ぶ線に平行し、かつ工具軸心を通る直線に対し、クロスシンニングにより形成された内側切れ刃前縁のなす角度αが１１５〜１２０°であることを特徴とする請求項１記載の穴明け工具。   When viewed from the front of the cutting edge, the inner cutting edge leading edge formed by cross thinning is parallel to the line connecting the outer cutting edge leading edge or the outer cutting edge both ends and passing through the tool axis. The drilling tool according to claim 1, wherein the angle α is 115 to 120 °. 前記穴明け工具の直径をＤとしたとき、溝部心厚が０．３５〜０．４５Ｄを有することを特徴とする請求項１又は請求項２に記載の穴明け工具。   3. The drilling tool according to claim 1, wherein a groove core thickness is 0.35 to 0.45 D, where D is a diameter of the drilling tool. 前記穴明け工具軸心に対し、ツイスト溝のねじれ角が３３〜４２°を有することを特徴とする請求項１乃至請求項３のいずれか１に記載の穴明け工具。   The drilling tool according to any one of claims 1 to 3, wherein a twist angle of the twist groove is 33 to 42 ° with respect to the drilling tool axis. 前記穴明け工具の切れ刃が高速度工具鋼ないし超硬合金であることを特徴とする請求項１乃至請求項４のいずれか１に記載の穴明け工具。   The drilling tool according to any one of claims 1 to 4, wherein a cutting edge of the drilling tool is high-speed tool steel or cemented carbide. 前記穴明け工具の切れ刃が、チタン化合物等の硬質被膜がコーテイングされたことを特徴とする請求項１乃至請求項５のいずれか１に記載の穴明け工具。   The drilling tool according to any one of claims 1 to 5, wherein the cutting edge of the drilling tool is coated with a hard coating such as a titanium compound.
JP2004013852A 2004-01-22 2004-01-22 Deep hole boring tool Pending JP2005205526A (en)

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WO2007143883A1 (en) * 2006-06-09 2007-12-21 Jiangsu Tiangong Tools Co., Ltd A strong high performance twist drill
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JP7304340B2 (en) 2017-09-15 2023-07-06 ギューリング カーゲー 4-flute drill
CN110370104A (en) * 2018-04-13 2019-10-25 肯纳金属公司 Manufacture the method and cutting tool of cutting tool

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