JP2005279824A - Throw-away drill - Google Patents

Throw-away drill Download PDF

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JP2005279824A
JP2005279824A JP2004095522A JP2004095522A JP2005279824A JP 2005279824 A JP2005279824 A JP 2005279824A JP 2004095522 A JP2004095522 A JP 2004095522A JP 2004095522 A JP2004095522 A JP 2004095522A JP 2005279824 A JP2005279824 A JP 2005279824A
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wall surface
tip
throw
holder
screw member
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Takashi Okumura
隆 奥村
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Kyocera Corp
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Kyocera Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a throw-away drill, having a tip binding force in spite of its small size and having excellent positioning accuracy and tool rigidity. <P>SOLUTION: A substantially plate-like throw-away tip 3 provided with two cutting edges 4 at the tip and a chip discharge groove provided adjacent to the cutting edge 4 on the side part is removably held and fixed in a tip recessed part 7 of a holder 2 having a rotating shaft 6 in common to the throw-away tip 3. The holder 2 is provided with a first clamping wall surface on one side of the inner wall of the tip recessed part 7 and a second clamping wall surface adjacent thereto. A screw member 9 operated from the side of the holder is screwed in the opposite wall of the tip recessed part 7. The throw-away tip 3 is provided with a first clamped wall surface and a second clamped wall surface respectively abutted on the first clamping wall surface and the second clamping surface on one side of the main side, and the other main side is provided with a recess part 11 formed to partially have a flat surface 11a, on which the tip of the screw member 9 abuts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、工具本体と同軸回転するスローアウェイチップが着脱可能なスローアウェイドリルに関する。   The present invention relates to a throw-away drill in which a throw-away tip that rotates coaxially with a tool body is detachable.

従来、工具本体と同軸回転するスローアウェイチップが着脱可能なスローアウェイドリルとして、特許文献１に開示されているような、平板状のチップをホルダの凹部に挿入し、凹部に形成されたV字状の壁面とチップに形成された同形状の壁面の間に発生する摩擦力でチップを位置決め、保持するという構成が知られている。   Conventionally, as a throw-away drill in which a throw-away tip that rotates coaxially with a tool body can be attached and detached, a flat tip as disclosed in Patent Document 1 is inserted into a concave portion of a holder, and a V-shape formed in the concave portion There is known a configuration in which a chip is positioned and held by a frictional force generated between a wall surface having a shape and a wall surface of the same shape formed on the chip.

また、特許文献２に開示されているような、チップ後端から突出した軸部に切り欠きを設け、ホルダ側面に形成されたねじ穴からねじを挿入し、ねじの先端を前記切り欠きに押し当て固定するという構成も知られている。
特表平１０−５０６８５１号公報 特開２００３−７１６２２号公報 Further, as disclosed in Patent Document 2, a notch is provided in the shaft portion protruding from the rear end of the chip, a screw is inserted from a screw hole formed in the side surface of the holder, and the tip of the screw is pushed into the notch. A configuration in which the contact is fixed is also known.
Japanese National Patent Publication No. 10-506851 JP 2003-71622 A

しかしながら、特許文献１に開示されているような構成では、V字状壁面の摩擦力だけでチップを保持しているのでチップの拘束力が十分でなく、切削加工中にホルダ凹部に過剰な力が加えられたときに凹部間隔が変形して広がるので、チップの位置決め精度が不安定になったり、摩擦力不足でチップが外れてしまったりすることがあった。   However, in the configuration as disclosed in Patent Document 1, since the tip is held only by the frictional force of the V-shaped wall surface, the binding force of the tip is not sufficient, and excessive force is applied to the holder recess during the cutting process. Since the gap between the recesses is deformed and widened, the chip positioning accuracy may become unstable, or the chip may come off due to insufficient frictional force.

また、特許文献２に開示されているような構成では、小径サイズのスローアウェイドリルにおいては、チップの軸部が必然的に細くなり、十分な拘束力が得られないばかりか、使用中に軸部が折れてチップが外れてしまうことがあった。また、仮にチップの軸部を太くしたとしても、その分だけホルダ側の肉厚を減じることになるので剛性不十分となり、ホルダの寿命低下は免れない。   Further, in the configuration as disclosed in Patent Document 2, in the throw-away drill having a small diameter size, the shaft portion of the tip is inevitably thin, and a sufficient restraining force cannot be obtained. The part might break and the chip might come off. Even if the tip shaft is made thicker, the thickness on the holder side is reduced by that amount, resulting in insufficient rigidity, and a reduction in the life of the holder is inevitable.

本発明はこのような従来技術の課題を解決するためになされたものであり、小径サイズに適用しても拘束力が強く、位置決め精度が良く、かつ強度に優れたスローアウェイドリルを提供することを目的とする。   The present invention has been made to solve such a problem of the prior art, and provides a throw-away drill that has a strong restraining force even when applied to a small diameter size, a high positioning accuracy, and an excellent strength. With the goal.

前記課題を解決するため、本発明のスローアウェイドリルは、先端部に二つの切刃と側面部に前記切刃に隣接する切屑排出溝を備えた略板状のスローアウェイチップを、該スローアウェイチップと共通の回転軸を有するホルダの先端凹部に着脱可能に狭持固定してなり、前記ホルダは、前記先端凹部の内壁の片側に第一挟持壁面とそれに隣接する第二挟持壁面を具備するとともに、前記先端凹部の対向壁にホルダ側方から操作可能なねじ部材を螺合配置しており、前記スローアウェイチップは、主側面の少なくとも片側に前記第一挟持壁面および前記第二挟持壁面にそれぞれ当接する第一被挟持壁面および第二被挟持壁面を具備するとともに、他方の主側面には窪み部が形成されて前記ホルダに螺合されたねじ部材が前記窪み部に当接されていることを特徴としている。   In order to solve the above-mentioned problems, a throw-away drill according to the present invention comprises a substantially plate-shaped throw-away tip having two cutting edges at a tip portion and a chip discharge groove adjacent to the cutting edge at a side portion. The holder is detachably nipped and fixed to a tip recess of a holder having a rotation axis common to the chip, and the holder includes a first sandwich wall surface and a second sandwich wall surface adjacent thereto on one side of the inner wall of the tip recess. In addition, a screw member operable from the side of the holder is screwed to the opposing wall of the tip recess, and the throw-away tip is attached to the first clamping wall surface and the second clamping wall surface on at least one side of the main side surface. A first sandwiched wall surface and a second sandwiched wall surface that contact each other are formed, and a recess portion is formed on the other main side surface, and a screw member screwed into the holder is contacted with the recess portion. It is characterized in Rukoto.

かかる構成によれば、小径のスローアウェイドリルに適用した場合でもホルダやチップの強度低下がなく、チップを径方向と軸方向の両方に確実に押圧することができるので、位置決めの繰り返し精度が向上し、高精度の穴あけ加工が実施できる。   According to such a configuration, even when applied to a small-diameter throw-away drill, the strength of the holder and the tip is not reduced, and the tip can be reliably pressed in both the radial direction and the axial direction, so that the positioning repeatability is improved. In addition, high-precision drilling can be performed.

また前記窪み部の前記ねじ部材が当接する面が平面状であることが、ねじ部材の先端と窪み部とを確実に当接させることができ、軸方向への押し付け力が安定する点で望ましい。   In addition, it is desirable that the surface of the hollow portion with which the screw member abuts is a flat surface because the tip end of the screw member and the hollow portion can be reliably brought into contact with each other and the pressing force in the axial direction is stable. .

また前記第一被挟持壁面と前記第二被挟持壁面とのなす角γが１４５度〜１６０度の範囲にあることが、チップとホルダの強度のバランスを確保しながら、拘束力を安定させることができる点で望ましい。   Further, the angle γ formed by the first sandwiched wall surface and the second sandwiched wall surface is in the range of 145 to 160 degrees to stabilize the restraining force while ensuring the balance between the strength of the tip and the holder. It is desirable in that it can.

さらに前記切屑排出溝が前記ホルダに装着した際に前記ホルダと連なってらせん状にねじれたすくい面と、回転軸に略平行な溝壁面を具備していることが、拘束面形状を大きく取ることができるので、位置決めの繰り返し精度がより安定する点で望ましい。   Furthermore, when the chip discharge groove is attached to the holder, it has a rake face that is spirally connected to the holder and a groove wall surface that is substantially parallel to the rotation axis, so that a large constraining surface shape can be obtained. Therefore, it is desirable in that the positioning repeatability is more stable.

また前記回転軸方向先端視において、前記ねじ部材の軸線と前記第一被挟持壁面とのなす角度をα、前記ねじ部材の軸線と前記第二被挟持壁面とのなす角度をβとしたとき、角度αと角度βとの差が１０度以内となる方向にねじ部材を螺合することが、ねじを押し当てたときにチップの動きがバランスされるので、傾いたままチップが取り付くこともなく、安定した信頼性の高い穴あけ加工が実施できる点で望ましい。   Further, when the angle formed between the axis of the screw member and the first sandwiched wall surface is α and the angle formed between the axis of the screw member and the second sandwiched wall surface is β in the rotational axis direction front view, When the screw member is screwed in a direction in which the difference between the angle α and the angle β is within 10 degrees, the movement of the tip is balanced when the screw is pressed, so that the tip does not attach while tilted. It is desirable in that stable and reliable drilling can be performed.

さらに縦段面視において前記ねじ部材の軸線と回転軸とのなす角σが８４度〜８８度の範囲となる方向にねじ部材を螺合することが、径方向への押し付け力、軸方向への押し付け力、およびチップの強度のバランスが良い点で望ましい。   Further, when the screw member is screwed in a direction in which the angle σ formed by the axis of the screw member and the rotation axis is in the range of 84 degrees to 88 degrees in the vertical plane view, the pressing force in the radial direction, the axial direction This is desirable in terms of a good balance between the pressing force and the strength of the chip.

先端部に二つの切刃と側面部に前記切刃に隣接する切屑排出溝を備えた略板状のスローアウェイチップを、該スローアウェイチップと共通の回転軸を有するホルダの先端凹部に着脱可能に狭持固定してなり、前記ホルダは、前記先端凹部の内壁の片側に第一挟持壁面とそれに隣接する第二挟持壁面を具備するとともに、前記先端凹部の対向壁にホルダ側方から操作可能なねじ部材を螺合配置しており、前記スローアウェイチップは、主側面の少なくとも片側に前記第一挟持壁面および前記第二挟持壁面にそれぞれ当接する第一被挟持壁面および第二被挟持壁面を具備するとともに、他方の主側面には窪み部が形成されて前記ホルダに螺合されたねじ部材が前記窪み部に当接されていることにより、小径のスローアウェイドリルに適用した場合でもホルダやチップの強度低下がなく、チップを径方向と軸方向の両方に確実に押圧することができるので、位置決めの繰り返し精度が向上し、高精度の穴あけ加工が実施できる。   A generally plate-shaped throw-away tip with two cutting edges at the tip and a chip discharge groove adjacent to the cutting edge at the side can be attached to and detached from the tip recess of the holder that has the same rotation axis as the throw-away tip. The holder is provided with a first clamping wall surface and a second clamping wall surface adjacent to one side of the inner wall of the tip recess, and can be operated from the side of the holder on the opposite wall of the tip recess. The throwaway tip has a first sandwiched wall surface and a second sandwiched wall surface that are in contact with the first sandwiching wall surface and the second sandwiching wall surface on at least one side of the main side surface, respectively. In addition, when a recess is formed on the other main side surface and the screw member screwed into the holder is in contact with the recess, the present invention is applied to a small-diameter throw-away drill. Even without strength reduction of the holder and the chip, can be reliably pressed against the both chips in the radial direction and axial direction, improves repeatability of positioning can be performed it is drilling with high accuracy.

本発明の実施形態について、図を用いて説明する。   Embodiments of the present invention will be described with reference to the drawings.

図１乃至図５は本発明の一実施形態を示すものであり、図１は本発明の一実施形態によるスローアウェイドリル（以下、ドリルと略す。）１の斜視図、図２は図１におけるホルダ２単体での斜視図、図３は図１におけるスローアウェイチップ（以下、チップと略す。）３単体での斜視図、図４は図３のチップ３先端視図、図５は図１のドリル１のネジ部材軸線位置での断面図を示している。   1 to 5 show an embodiment of the present invention. FIG. 1 is a perspective view of a throw-away drill (hereinafter abbreviated as a drill) 1 according to an embodiment of the present invention, and FIG. FIG. 3 is a perspective view of the throwaway tip (hereinafter abbreviated as “chip”) 3 alone in FIG. 1, FIG. 4 is a front view of the tip 3 of FIG. 3, and FIG. FIG. 3 shows a cross-sectional view of the drill 1 at the screw member axis position.

まず本実施形態のドリル１は、図１に示すように、先端部に二つの切刃４と側面部に前記切刃４に隣接する切屑排出溝５を備えた略板状のチップ３を、該チップ３と共通の回転軸６を有するホルダ２の先端凹部７に着脱可能に狭持固定してなる構成である。そして図２に示すように、前記ホルダ２は、前記先端凹部７の内壁の片側に第一挟持壁面８ａとそれに隣接する第二挟持壁面８ｂを具備するとともに、前記先端凹部７の対向壁にホルダ２側方から操作可能なねじ部材９を螺合配置している。また図３あるいは図４に示すように、前記チップ３は、主側面の少なくとも片側に前記第一挟持壁面８ａおよび前記第二挟持壁面８ｂにそれぞれ当接する第一被挟持壁面１０ａおよび第二被挟持壁面１０ｂを具備するとともに、他方の主側面には窪み部１１が形成されて前記ホルダに螺合されたねじ部材が前記窪み部に当接されている。   First, as shown in FIG. 1, the drill 1 of the present embodiment includes a substantially plate-shaped tip 3 having two cutting edges 4 at the tip and a chip discharge groove 5 adjacent to the cutting edge 4 at the side. This is a configuration in which the tip 3 of the holder 2 having the rotation axis 6 common to the chip 3 is detachably nipped and fixed. As shown in FIG. 2, the holder 2 includes a first clamping wall surface 8 a and a second clamping wall surface 8 b adjacent thereto on one side of the inner wall of the tip recess 7, and a holder on the opposing wall of the tip recess 7. A screw member 9 that can be operated from two sides is screwed. Further, as shown in FIG. 3 or FIG. 4, the chip 3 has a first sandwiched wall surface 10a and a second sandwiched wall that are in contact with the first sandwiching wall surface 8a and the second sandwiching wall surface 8b on at least one side of the main side surface, respectively. While having the wall surface 10b, the hollow part 11 is formed in the other main side surface, and the screw member screwed together by the said holder is contact | abutted to the said hollow part.

前記チップ３を前記ホルダ２へ装着する際には、前記ホルダ２先端側から主側面の形状に沿って前記チップ３を挿入する。ここで、前記第一挟持壁面８ａと前記第二挟持壁面８ｂとはその交差部分が凹むように角度をもって隣接しており、前記チップ３の主側面も前記第一挟持壁面８ａと前記第二挟持壁面８ｂとに当接すべく同じ角度関係で前記第一被挟持壁面１０ａおよび前記第二被挟持壁面１０ｂを備えている。そして前記先端凹部７の前記第一挟持壁面８ａと前記第二挟持壁面８ｂとが形成されていない対向壁に備えられたホルダ２側方から操作可能なねじ部材９の先端面を、前記チップ３の他方の主側面に形成された窪み部１１に押圧させることで、前記第一挟持壁面８ａに前記第一被挟持壁面１０ａを、前記第二挟持壁面８ｂに前記第二被挟持壁面１０ｂをそれぞれ確実に当接させることでチップ３が径方向に位置ずれすることなく中心位置が定まりやすい。特に小径のドリルに適用した場合であってもホルダやチップの強度低下がなく、チップを径方向と軸方向の両方に確実に押圧することができるので、位置決めの繰り返し精度が向上し、高精度の穴あけ加工が可能となる。   When the chip 3 is mounted on the holder 2, the chip 3 is inserted along the shape of the main side surface from the front end side of the holder 2. Here, the first clamping wall surface 8a and the second clamping wall surface 8b are adjacent to each other at an angle so that the intersecting portion is recessed, and the main side surface of the chip 3 is also connected to the first clamping wall surface 8a and the second clamping wall surface. The first sandwiched wall surface 10a and the second sandwiched wall surface 10b are provided at the same angular relationship so as to contact the wall surface 8b. The tip 3 of the screw member 9 that can be operated from the side of the holder 2 provided on the opposing wall where the first clamping wall surface 8a and the second clamping wall surface 8b of the tip recess 7 are not formed. By pressing the depression 11 formed on the other main side surface of the first sandwiched wall surface 10a on the first sandwiched wall surface 8a, and the second sandwiched wall surface 10b on the second sandwiched wall surface 8b, respectively. By reliably abutting, the center position can be easily determined without the tip 3 being displaced in the radial direction. Especially when applied to small-diameter drills, the strength of the holder and tip is not reduced, and the tip can be pressed reliably in both the radial and axial directions, improving positioning repeatability and high accuracy. Can be drilled.

ちなみにチップ３の主側面に形成される前記第一被挟持壁面１０ａおよび前記第二被挟持壁面１０ｂは片面だけに形成されてもよいが、図３乃至図５に示すように中心軸に対して対称な位置となるようにして両面に形成してもよい。この場合には窪み部１１も合わせて両面に形成することで、チップ３を１８０度回転させても取り付けることができるので、チップ交換時の操作性が向上する。   Incidentally, the first sandwiched wall surface 10a and the second sandwiched wall surface 10b formed on the main side surface of the chip 3 may be formed on only one surface, but as shown in FIGS. It may be formed on both sides so as to be symmetrical. In this case, the recess 11 is also formed on both surfaces so that the chip 3 can be mounted even if it is rotated 180 degrees, so that the operability at the time of chip replacement is improved.

また図４に示すように、前記第一被挟持壁面１０ａと前記第二被挟持壁面１０ｂとのなす角γが１４５度〜１６０度の範囲にあることが、チップとホルダの強度のバランスを確保しながら、拘束力を安定させることができる。   As shown in FIG. 4, the angle γ formed by the first sandwiched wall surface 10a and the second sandwiched wall surface 10b is in the range of 145 to 160 degrees to ensure the balance between the strength of the tip and the holder. However, the restraining force can be stabilized.

さらに前記切屑排出溝５が、前記ホルダに装着した際に前記ホルダと連なってらせん状にねじれたすくい面１２と、回転軸６に略平行な溝壁面１３を具備していることが、切屑排出性を損なうことなく拘束面となる前記第二被挟持壁面１０ｂの面積を確保することができ、位置決めの繰り返し精度がより安定する。   Further, the chip discharge groove 5 includes a rake face 12 spirally twisted continuously with the holder when mounted on the holder, and a groove wall surface 13 substantially parallel to the rotating shaft 6. The area of the second sandwiched wall surface 10b serving as a constraining surface can be secured without impairing the properties, and the positioning repeatability is more stable.

また前記回転軸６方向先端視において、前記ねじ部材９の軸線９ａと前記第一被挟持壁面１０ａとのなす角度αと、前記ねじ部材９の軸線９ａと前記第二被挟持壁面１０ｂとのなす角度βとの差が１０度以内となる方向にねじ部材を螺合することが、ねじ部材９を押し当てたときにチップ３の各挟持壁面がバランスよく押圧されるので、傾いたままチップが取り付くこともなく、安定した取り付け精度が得られ、結果として信頼性の高い穴あけ加工が実施できる。   In addition, when viewed from the front end in the direction of the rotation axis 6, the angle α formed between the axis 9a of the screw member 9 and the first sandwiched wall surface 10a and the axis 9a of the screw member 9 and the second sandwiched wall surface 10b are formed. When the screw member is screwed in a direction in which the difference from the angle β is within 10 degrees, each clamping wall surface of the chip 3 is pressed with good balance when the screw member 9 is pressed. Stable mounting accuracy can be obtained without mounting, and as a result, highly reliable drilling can be performed.

さらに図５に示すように、縦断面視において前記ねじ部材９の軸線９ａと回転軸６とのなす角σが８４度〜８８度の範囲となる方向にねじ部材を螺合することが、チップ３の肉厚を減じることによる剛性低下を生じることなく、チップ３の径方向への押し付け力、軸方向への押し付け力をバランス良く得られる。σが８４度より小さいとチップ３の肉厚を減じることとなりその分チップ３の剛性が低下してチップ３が損傷しやすくなる恐れがあり、σが８８度以上では軸方向への押し付け力が不足して加工後にドリル１をワークから引き抜くときなどチップ３をホルダ２から引き離そうとする力が発生するときにチップ３が外れてしまう恐れがあるため、σは前述した範囲にあることが望ましい。   Further, as shown in FIG. 5, the screw member is screwed in a direction in which an angle σ formed by the axis 9 a of the screw member 9 and the rotary shaft 6 is in a range of 84 degrees to 88 degrees in the longitudinal sectional view. Thus, the radial pressing force and the axial pressing force of the chip 3 can be obtained in a well-balanced manner without causing a reduction in rigidity due to the reduction in the thickness of the chip 3. If σ is less than 84 degrees, the thickness of the chip 3 is reduced, and the rigidity of the chip 3 may be reduced accordingly, and the chip 3 may be easily damaged. If σ is 88 degrees or more, the pressing force in the axial direction is increased. Since there is a possibility that the tip 3 may come off when a force is generated to pull the tip 3 away from the holder 2 such as when the drill 1 is pulled out from the workpiece after machining, it is desirable that σ is in the above-mentioned range.

また前記窪み部１１の斜平面１１ａが前記ねじ部材９の先端面における工具先端側の６０％から８０％の範囲で当接することが、前記ねじ部材９の先端面の工具先端側のみを窪み部１１の斜平面１１ａに確実に押圧することができるので、前記ねじ部材９を締めこんだときにチップ３を浮き上がらせることなく、軸方向すなわちホルダ２の後端側への押し付ける力がより安定する点で望ましい。そのため、切削中の不安定な振動にも強く、加工安定性に優れたスローアウェイドリルを構成することができる。   Further, the slant plane 11a of the recess 11 abuts within a range of 60% to 80% of the tip end side of the screw member 9 on the tip end side of the screw member 9 so that only the tool tip side of the tip end surface of the screw member 9 is indented. 11 can be surely pressed against the oblique plane 11a, so that when the screw member 9 is tightened, the tip 3 is not lifted up, and the pressing force in the axial direction, that is, the rear end side of the holder 2 is more stable. Desirable in terms. Therefore, a throw-away drill that is resistant to unstable vibration during cutting and excellent in processing stability can be configured.

以上、本発明の実施形態を例示したが、本発明は前記実施形態に限定されるものではなく、発明の目的を逸脱しない限り任意のものとすることができることはいうまでもない。   As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to the said embodiment, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the objective of invention.

本発明の一実施形態によるスローアウェイドリルの斜視図である。1 is a perspective view of a throw-away drill according to an embodiment of the present invention. 図１におけるホルダ単体での斜視図である。It is a perspective view with the holder single-piece | unit in FIG. 図１におけるスローアウェイチップ単体での斜視図である。FIG. 2 is a perspective view of a single throwaway tip in FIG. 1. 図３のスローアウェイチップ先端視図である。It is a throwaway tip front view of FIG. 図１のスローアウェイドリルのネジ部材軸線位置での断面図である。It is sectional drawing in the thread member axial position of the throw away drill of FIG.

符号の説明Explanation of symbols

１ スローアウェイドリル（ドリル）
２ ホルダ
３ スローアウェイチップ（チップ）
４ 切刃
５ 切屑排出溝
６ 回転軸
７ 先端凹部
８ａ 第一挟持壁面
８ｂ 第二挟持壁面
９ ねじ部材
９ａ ねじ部材の軸線
１０ａ 第一被挟持壁面
１０ｂ 第二被挟持壁面
１１ 窪み部
１１ａ 窪み部の斜平面
１２ すくい面
１３ 溝壁面
α ドリル先端視でねじ部材の軸線と第一被挟持壁面のなす角度
β ドリル先端視でねじ部材の軸線と第二被挟持壁面のなす角度
γ 第一被挟持壁面と第二被挟持壁面とのなす角度
σ ねじ部材の軸線と回転軸とのなす角度 1 Throw away drill (drill)
2 Holder 3 Throw away tip (chip)
4 Cutting blade 5 Chip discharge groove 6 Rotating shaft 7 Tip recess 8a First clamping wall surface 8b Second clamping wall surface 9 Screw member 9a Screw member axis 10a First clamping wall surface 10b Second clamping wall surface 11 Indentation part 11a Indentation part Slant plane 12 Rake face 13 Groove wall surface α Angle formed between the axis of the screw member and the first sandwiched wall surface as viewed from the drill tip Angle between the screw member axis and the second sandwiched wall surface as viewed from the drill tip γ First sandwiched wall surface Between the screw and the second sandwiched wall σ Angle between the screw member axis and the rotation axis

Claims (6)

先端部に二つの切刃と側面部に前記切刃に隣接する切屑排出溝を備えた略板状のスローアウェイチップを、該スローアウェイチップと共通の回転軸を有するホルダの先端凹部に着脱可能に狭持固定してなるスローアウェイドリルにおいて、
前記ホルダは、前記先端凹部の内壁の片側に第一挟持壁面とそれに隣接する第二挟持壁面を具備するとともに、前記先端凹部の対向壁にホルダ側方から操作可能なねじ部材を螺合配置しており、
前記スローアウェイチップは、主側面の少なくとも片側に前記第一挟持壁面および前記第二挟持壁面にそれぞれ当接する第一被挟持壁面および第二被挟持壁面を具備するとともに、他方の主側面には窪み部が形成されて前記ホルダに螺合されたねじ部材が前記窪み部に当接されていることを特徴とするスローアウェイドリル。 A generally plate-shaped throw-away tip with two cutting edges at the tip and a chip discharge groove adjacent to the cutting edge at the side can be attached to and removed from the tip recess of a holder that has the same rotation axis as the throw-away tip. In the throw-away drill that is fixed to
The holder includes a first clamping wall surface and a second clamping wall surface adjacent to the first clamping wall surface on one side of the inner wall of the tip recess, and a screw member operable from the side of the holder is screwed to the opposing wall of the tip recess. And
The throw-away tip includes a first sandwiched wall surface and a second sandwiched wall surface that are in contact with the first sandwiched wall surface and the second sandwiched wall surface, respectively, on at least one side of the major side surface, and a depression on the other major side surface. A throw-away drill characterized in that a screw member formed with a portion and screwed into the holder is in contact with the recess. 前記窪み部の前記ねじ部材が当接する面が平面状であることを特徴とする請求項１記載のスローアウェイドリル。 The throw-away drill according to claim 1, wherein a surface of the hollow portion with which the screw member abuts is flat. 前記第一被挟持壁面と前記第二被挟持壁面とのなす角γが１４５度〜１６０度の範囲にあることを特徴とする請求項１または２に記載のスローアウェイドリル。 The throw-away drill according to claim 1 or 2, wherein an angle γ formed by the first sandwiched wall surface and the second sandwiched wall surface is in a range of 145 to 160 degrees. 前記切屑排出溝が前記ホルダに装着した際に前記ホルダと連なってらせん状にねじれたすくい面と、回転軸に略平行な溝壁面を具備していることを特徴とする請求項１乃至３のいずれかに記載のスローアウェイドリル。 4. The chip discharge groove includes a rake face that spirally twists continuously with the holder when the chip discharge groove is attached to the holder, and a groove wall surface that is substantially parallel to the rotation axis. The throw-away drill according to any one of the above. 前記回転軸方向先端視において、前記ねじ部材の軸線と前記第一被挟持壁面とのなす角度をα、前記ねじ部材の軸線と前記第二被挟持壁面とのなす角度をβとしたとき、角度αと角度βとの差が１０度以内となる方向にねじ部材を螺合することを特徴とする請求項１乃至４のいずれか記載のスローアウェイドリル。 When the angle formed between the axis of the screw member and the first sandwiched wall surface is α and the angle formed between the axis of the screw member and the second sandwiched wall surface is β The throw-away drill according to any one of claims 1 to 4, wherein the screw member is screwed in a direction in which a difference between α and angle β is within 10 degrees. 縦断面視において、前記ねじ部材の軸線と回転軸とのなす角σが８４度〜８８度の範囲となる方向にねじ部材を螺合することを特徴とする請求項１乃至５のいずれか記載のスローアウェイドリル。 6. The screw member is screwed in a direction in which an angle σ formed by an axis of the screw member and a rotation axis is in a range of 84 degrees to 88 degrees in a longitudinal sectional view. Throwaway drill.
JP2004095522A 2004-03-29 2004-03-29 Throw-away drill Pending JP2005279824A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110274509A1 (en) * 2003-12-19 2011-11-10 Stokey Steven R Cutting insert with helical geometry and holder therefor
CN105537654A (en) * 2015-12-30 2016-05-04 株洲钻石切削刀具股份有限公司 Drilling tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110274509A1 (en) * 2003-12-19 2011-11-10 Stokey Steven R Cutting insert with helical geometry and holder therefor
US8371778B2 (en) * 2003-12-19 2013-02-12 Allied Machine & Engineering Corp. Cutting insert with helical geometry and holder therefor
CN105537654A (en) * 2015-12-30 2016-05-04 株洲钻石切削刀具股份有限公司 Drilling tool

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