JP4272455B2 - Throw-away rotary cutting tool - Google Patents

Throw-away rotary cutting tool Download PDF

Info

Publication number
JP4272455B2
JP4272455B2 JP2003067244A JP2003067244A JP4272455B2 JP 4272455 B2 JP4272455 B2 JP 4272455B2 JP 2003067244 A JP2003067244 A JP 2003067244A JP 2003067244 A JP2003067244 A JP 2003067244A JP 4272455 B2 JP4272455 B2 JP 4272455B2
Authority
JP
Japan
Prior art keywords
throw
tip
tapered surface
tool
tool holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2003067244A
Other languages
Japanese (ja)
Other versions
JP2004276134A (en
Inventor
隆 奥村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to JP2003067244A priority Critical patent/JP4272455B2/en
Publication of JP2004276134A publication Critical patent/JP2004276134A/en
Application granted granted Critical
Publication of JP4272455B2 publication Critical patent/JP4272455B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Drilling Tools (AREA)

Description

【０００１】
【発明の属する技術分野】
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式回転切削工具に関する。
【０００２】
【従来の技術】
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式回転切削工具としては、従来、工具本体の側面に設けたねじ穴からねじを挿入し、スローアウェイチップ側面にねじを押し付けこれを固定するといった構成が一般に知られている（例えば、特許文献１参照。）。
【０００３】
また、図１１に示すようなスローアウェイチップの裏側にねじ穴を設け、装着面裏側からねじ止めしてスローアウェイチップを工具本体に引き込む構成や、後述の特許文献２で開示されているようなホルダの弾性変形を利用してスローアウェイチップを固定する構成も知られている。
【０００４】
【特許文献１】
特表平１１−５００９６７号公報
【特許文献２】
特表２００２−５０１４４１号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、特許文献１で開示されているような単に工具本体の側面からスローアウェイチップをねじ止めする構成では、スローアウェイチップが極めて簡便に交換できるという利点があるものの、スローアウェイチップと工具本体との中心軸を一致させることが難しく、高い加工精度が得られにくいという問題があった。
【０００６】
また、図１１で示したようなスローアウェイチップを工具本体に引き込む構成にすれば、スローアウェイチップと工具本体との中心軸を一致させることが可能となるが、スローアウェイチップを交換するたびホルダ毎刃物台から外さなければならず、作業性が著しく悪化するという難点がある。
【０００７】
また、特許文献２で開示されているようなホルダの弾性変形を利用した構成では、良好な作業性を維持しつつスローアウェイチップと工具本体との中心軸を一致させることが比較的可能ではあるが、ホルダの弾性変形作用だけでスローアウェイチップを強固に固定する必要があるため、ホルダの特定部位に無理な力が繰り返し加わる。その結果、スローアウェイチップの交換を繰り返すうちにホルダの弾性力が弱まってしまい、スローアウェイチップが工具本体から脱落したり、破損したりするという問題が生ずる。よって、少ない使用回数で工具ホルダを新品に交換しなければならず、極めて不経済なこととなる。
【０００８】
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、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式回転切削工具において、交換が容易で、繰り返し加工精度が高く長寿命なスローアウェイ式回転切削工具を提供することを目的とする。
【０００９】
【課題を解決するための手段】
前記課題を解決するため、請求項１のスローアウェイ式回転切削工具は、工具ホルダの先端部にスローアウェイチップが着脱可能に装着されてなるスローアウェイ式回転切削工具であって、前記スローアウェイチップの後端部は、前記スローアウェイチップの外周から軸心に近づくにつれて後端側へ突出するテーパー面と、該テーパー面の突端部から前記工具ホルダ側に突出し固定手段を受け入れる切り欠きを有する棒状部と、前記スローアウェイチップの外周から前記棒状部にわたって前記テーパー面に隣接するとともに切削時に工具逆回転方向に面する係止面と、を備えており、前記工具ホルダの先端部は、前記工具ホルダの外周から軸心に近づくにつれて基端側へ窪んでいる凹テーパー面と、前記棒状部と嵌合すべく前記凹テーパー面の奥端部に形成された嵌合穴と、前記工具ホルダの外周から前記嵌合穴にわたって前記凹テーパー面に隣接するとともに切削時に工具回転方向に面する係止受け面と、前記工具ホルダの外周側から軸心に近づくにつれて前記工具ホルダの基端側に向かうように形成された貫通孔と、を備えており、前記スローアウェイチップの前記テーパー面を前記工具ホルダの前記凹テーパー面に当接させるとともに、前記スローアウェイチップの前記係止面を前記工具ホルダの前記係止受け面に当接させ、前記貫通孔から挿入した前記固定手段で前記切り欠きの先端面を押し付けることにより前記スローアウェイチップを前記工具ホルダに固定することを特徴としている。
【００１０】
かかる構成によれば、スローアウェイチップとホルダがテーパー面同士で当接するので必然的に同軸となるため、高い加工精度が保証できるとともに、スローアウェイチップを交換しても同様の精度が得られるので、繰り返し加工精度に極めて優れた加工を行うことができる。また、スローアウェイチップの交換操作が容易で作業性にも優れ、且つホルダ劣化の少ない経済的なスローアウェイ式回転切削工具とすることができる。
【００１１】
また、請求項２のスローアウェイ式回転切削工具は、前記貫通孔の中心軸と前記軸心とのなす角が前記テーパー面と前記軸心とのなす角よりも小さくなっていることを特徴としている。
【００１２】
かかる構成によれば、スローアウェイチップ棒状部の切り欠きに加えられた力がテーパー面をよりホルダ側に引き込むように作用するので、特に穴加工した後で工具を加工物から引き離す際のスローアウェイチップの先端側へのずれを抑制することができる。
【００１３】
また、請求項３のスローアウェイ式回転切削工具は、前記スローアウェイチップの棒状部の断面形状が多角形であることを特徴としている。
【００１４】
かかる構成によれば、回転トルクを前記テーパー面上に設けられた係止面だけでなく、棒状部の側面部でも受けることができるので、回転方向に対するスローアウェイチップの拘束がより強固になる。
【００１５】
【発明の実施の形態】
以下、本発明の実施形態を添付図面により説明する。
【００１６】
図１乃至図７は本発明のスローアウェイドリルとしての実施例を示すものであり、図１は本実施例によるスローアウェイドリルにおける分解側面図、図２は図１のスローアウェイチップを装着した状態の断面図、図３は図１の工具ホルダ後端側斜視図、図４は図１の工具ホルダ先端側斜視図、図５は図４のスローアウェイチップを装着した状態の工具ホルダ先端側斜視図、図６は本実施例によるホルダの先端視図、図７は本実施例によるスローアウェイチップの後端視図である。
【００１７】
ここで、本実施例によるスローアウェイドリルは、ホルダ１の先端部に着脱可能なスローアウェイチップ２が装着され、前記スローアウェイチップ２を被削材に対し工具ホルダ１と同軸である軸心３周りに相対回転させて切削するような構成となっている。図１に示すように、前記スローアウェイチップ２の後端部は、前記軸心３に近づくにつれて後端側へ突出するテーパー面４からなるとともに切削時に工具逆回転方向に面する係止面５を前記テーパー面４上から突出するように形成し、且つ前記テーパー面４突端部から前記工具ホルダ１側に突出し固定手段６を受け入れる切り欠き７を有する棒状部８を備えている。また前記工具ホルダ１の先端部は、前記テーパー面４と当接すべく軸心３に近づくにつれて基端側へ窪んでいる凹テーパー面９からなるとともに前記係止面５と当接すべく切削時に工具回転方向に面する係止受け面１０を前記凹テーパー面９上から突出するように形成し、且つ前記棒状部８と嵌合すべく前記凹テーパー面９奥端部に嵌合穴１１を備えており、さらに前記切り欠き７に前記固定手段６の先端部を当接させるべく軸心３に対して斜めに且つ前記工具ホルダ１先端側から基端側へ向かうに従い軸心３に近づくように前記固定手段６の挿入孔（貫通孔）１２が設けられた構成となっている。
【００１８】
上記のような構成により、円錐状のテーパー面に沿ってスローアウェイチップ２がホルダ１に装着されるので、前記スローアウェイチップ２と工具ホルダ１とがテーパー面同士で当接するので必然的に同軸となるため、中心ズレのない高い加工精度が得られる。
【００１９】
また、スローアウェイチップ２の交換は、前記ホルダ１先端近傍にある前記挿入孔１２に取り付けられた固定手段６を操作するだけで可能であるので、操作が容易な上、作業効率も良い。
【００２０】
さらに、スローアウェイチップ２は固定手段６で切り欠き７の先端面を押し付けることにより前記ホルダ１に固定される構成となっており、前記スローアウェイチップ２の前記ホルダ１への取付に関して当接面を摺動させることはない。したがって、スローアウェイチップ２の着脱を繰り返しても前記ホルダ１側に変化が生じてクランプされる力が低下するようなことはないので、同一ホルダが長期間使用でき経済的である。
【００２１】
また、前記切り欠き７には前記固定手段６の先端部を当接させるべく底面１３が備えられており、該底面１３に直行するとともに軸心３に対して斜めに且つ前記工具ホルダ１先端側から基端側へ向かうに従い軸心３に近づくように前記固定手段６の挿入孔１２が設けられている。ここで、挿入孔１２の中心軸１４と前記軸心３とのなす角αは、前記テーパー面４と前記軸心３とのなす角βより小さいことが望ましい。このような状態では、前記切り欠き７の底面１３に加えられた力が前記テーパー面４をホルダ１側の前記凹テーパー面９に引き込むように作用するので、特に加工後に工具を加工物から抜く際に、前記スローアウェイチップ２と加工内壁面との摩擦により前記スローアウェイチップ２が前記ホルダ１の先端側へずれるのを防ぐことができる。その結果、加工内壁面の損傷を抑制できるとともに繰り返し加工精度の高い加工を行うことができる。
【００２２】
また、図８及び図９には本発明の他の実施例として、スローアウェイチップ後端側の棒状部８の断面形状を多角形としたタイプのスローアウェイチップ２の後端視図を示している。このように棒状部８の断面を多角形とすることによって、切削の回転トルクを前記テーパー面４に形成した係止面５だけでなく、棒状部８の側面でも受けることができるので、回転方向に対する拘束を特に強めた状態でスローアウェイチップ２をホルダ１に固定することができる。また、スローアウェイチップ２とホルダ１の係合部の形状や大きさの自由度が増してくるので、同じ刃先形状で異なる特性のホルダにするなど、加工条件に応じた最適の工具をバラエティに富んだ状態で提供することができる。
【００２３】
また本発明は、前記スローアウェイチップ２の切刃形状を変更することにより、穴加工に用いられる様々なスローアウェイ式回転切削工具へ応用が可能であり、図１０ではリーマ工具としての実施例を示している。
【００２４】
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。
【００２５】
【発明の効果】
以上記述したとおり、請求項１のスローアウェイ式回転切削工具は、工具ホルダの先端部にスローアウェイチップが着脱可能に装着されてなるスローアウェイ式回転切削工具であって、前記スローアウェイチップの後端部は、軸心に近づくにつれて後端側へ突出するテーパー面からなるとともに切削時に工具逆回転方向に面する係止面を前記テーパー面上から突出するように形成し、且つ前記テーパー面突端部から前記工具ホルダ側に突出し固定手段を受け入れる切り欠きを有する棒状部を備えており、前記工具ホルダの先端部は、前記テーパー面と当接すべく軸心に近づくにつれて基端側へ窪んでいる凹テーパー面からなるとともに前記係止面と当接すべく切削時に工具回転方向に面する係止受け面を前記凹テーパー面上から突出するように形成し、且つ前記棒状部と嵌合すべく前記凹テーパー面奥端部に嵌合穴を備えており、さらに前記切り欠きに前記固定手段の先端部を当接させるべく軸心に対して斜めに且つ前記工具ホルダ先端側から基端側へ向かうに従い軸心に近づくように前記固定手段の挿入孔が設けられていることにより、スローアウェイチップとホルダがテーパー面同士で当接するので必然的に同軸となるため、高精度の回転切削加工ができる。また、スローアウェイチップの交換が容易で作業性にも優れ、且つホルダ劣化の少ない経済的なスローアウェイ式回転切削工具とすることができる。
【００２６】
また、請求項２のスローアウェイ式回転切削工具は、前記挿入孔の中心軸と前記軸心とのなす角が前記テーパー面と前記軸心とのなす角よりも小さくなっているので、特に加工後に工具を加工物から引き離す際にスローアウェイチップのホルダ先端側へのずれを抑制することが出来る。
【００２７】
また、請求項３のスローアウェイ式回転切削工具は、スローアウェイチップ棒状部の断面形状が多角形であるので、切削の回転トルクを前記棒状部でも受けることができ、回転方向に対するスローアウェイチップの拘束をより強くすることができる。
【図面の簡単な説明】
【図１】本実施例によるスローアウェイ式回転切削工具における分解側面図である。
【図２】図１のスローアウェイチップを装着した状態の断面図である。
【図３】図１の工具ホルダ後端側斜視図である。
【図４】図１の工具ホルダ先端側斜視図である。
【図５】図４のスローアウェイチップを装着した状態の工具ホルダ先端側斜視図である。
【図６】本実施例によるホルダの先端視図である。
【図７】本実施例によるスローアウェイチップの後端視図である。
【図８】本発明の他の実施例によるスローアウェイチップの後端視図である。
【図９】本発明の他の実施例によるスローアウェイチップの後端視図である。
【図１０】本発明の他の実施例によるスローアウェイ式回転切削工具の側面図である。
【図１１】従来のスローアウェイ式回転切削工具の側面図である。
【符号の説明】
１：ホルダ
２：スローアウェイチップ
３：軸心
４：テーパー面
５：係止面
６：固定手段
７：切り欠き
８：棒状部
９：凹テーパー面
１０：係止受け面
１１：嵌合穴
１２：挿入孔
１３：底面
１４：挿入孔の中心軸
α：挿入孔の中心軸と軸心とのなす角
β：テーパー面と軸心とのなす角[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throw-away rotary cutting tool in which a throw-away tip that rotates coaxially with a tool body is detachable.
[0002]
[Prior art]
Conventionally, as a throw-away rotary cutting tool that can attach and detach a throw-away tip that rotates coaxially with the tool body, conventionally, a screw is inserted from a screw hole provided on the side of the tool body, and the screw is pressed against the side of the throw-away tip and fixed. Such a configuration is generally known (for example, see Patent Document 1).
[0003]
Further, a screw hole is provided on the back side of the throw-away tip as shown in FIG. 11, and the throw-away tip is pulled into the tool body by screwing from the back side of the mounting surface, as disclosed in Patent Document 2 described later. A configuration is also known in which the throw-away tip is fixed using elastic deformation of the holder.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 11-500967 [Patent Document 2]
Japanese translation of PCT publication No. 2002-501441
[Problems to be solved by the invention]
However, the configuration in which the throwaway tip is simply screwed from the side of the tool body as disclosed in Patent Document 1 has the advantage that the throwaway tip can be replaced very easily, but the throwaway tip and the tool body There is a problem that it is difficult to match the central axes of the two and it is difficult to obtain high machining accuracy.
[0006]
Further, if the throw-away tip as shown in FIG. 11 is pulled into the tool body, the central axes of the throw-away tip and the tool body can be made to coincide with each other. Each turret must be removed from the tool post, and there is a problem that workability is significantly deteriorated.
[0007]
Further, in the configuration using the elastic deformation of the holder as disclosed in Patent Document 2, it is relatively possible to match the central axes of the throw-away tip and the tool body while maintaining good workability. However, since it is necessary to firmly fix the throw-away tip only by the elastic deformation action of the holder, an excessive force is repeatedly applied to a specific part of the holder. As a result, there is a problem that the elastic force of the holder is weakened while the throw-away tip is repeatedly replaced, and the throw-away tip is dropped from the tool body or is damaged. Therefore, the tool holder must be replaced with a new one with a small number of uses, which is extremely uneconomical.
[0008]
The present invention has been made in order to solve the above-described problems of the prior art, and in a throw-away rotary cutting tool in which a throw-away tip that rotates coaxially with a tool body is detachable, replacement is easy and iterative processing is performed. An object of the present invention is to provide a throwaway rotary cutting tool with high accuracy and long life.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problem, the throw-away rotary cutting tool according to claim 1 is a throw-away rotary cutting tool in which a throw-away tip is detachably attached to a tip portion of a tool holder, and the throw-away tip is provided. rear end, the rod-shaped having a tapered surface which projects toward the rear end closer to the axis from the outer periphery of the cutting insert, from the projecting end of the tapered surface notch receiving the projecting fastening means to the tool holder side of the And a locking surface that is adjacent to the tapered surface from the outer periphery of the throw-away tip to the rod-shaped portion and faces in the tool reverse rotation direction at the time of cutting, and the tip of the tool holder includes the tool and a concave tapered surface is recessed proximally toward the axis from the outer periphery of the holder, said concave tapered surface so as to mate with said rod portion A fitting hole formed in the back end, a latch receiving surface facing the tool rotating direction during machining as well as adjacent to the concave tapered surface over the fitting hole from the outer periphery of the tool holder, the outer periphery of the tool holder A through hole formed so as to be directed toward the base end side of the tool holder as it approaches the axis from the side, and the tapered surface of the throw-away tip abuts on the concave tapered surface of the tool holder The throw away tip is brought into contact with the catch receiving surface of the tool holder, and the tip end surface of the notch is pressed by the fixing means inserted from the through hole. The chip is fixed to the tool holder .
[0010]
According to such a configuration, since the throwaway tip and the holder are in contact with each other at the tapered surfaces, it is inevitably coaxial, so that high processing accuracy can be guaranteed and the same accuracy can be obtained even if the throwaway tip is replaced. Therefore, it is possible to perform extremely excellent processing with repeated processing accuracy. In addition, the throw-away tip can be easily replaced, the workability is excellent, and an economical throw-away rotary cutting tool with little holder deterioration can be obtained.
[0011]
The throw-away rotary cutting tool according to claim 2 is characterized in that an angle formed by a central axis of the through hole and the shaft center is smaller than an angle formed by the tapered surface and the shaft center. Yes.
[0012]
According to such a configuration, the force applied to the notch of the throw-away tip rod-shaped portion acts to draw the tapered surface closer to the holder side, so that the throw-away when the tool is pulled away from the workpiece, particularly after drilling. Deviation to the tip side of the chip can be suppressed.
[0013]
The throwaway rotary cutting tool of claim 3 is characterized in that the cross-sectional shape of the rod-shaped portion of the throwaway tip is a polygon.
[0014]
According to such a configuration, the rotational torque can be received not only on the locking surface provided on the tapered surface but also on the side surface portion of the rod-like portion, so that the restraint of the throw-away tip with respect to the rotation direction becomes stronger.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0016]
1 to 7 show an embodiment of the throw-away drill according to the present invention, FIG. 1 is an exploded side view of the throw-away drill according to the present embodiment, and FIG. 2 is a state in which the throw-away tip of FIG. 3 is a perspective view of the rear end side of the tool holder of FIG. 1, FIG. 4 is a perspective view of the front side of the tool holder of FIG. 1, and FIG. 5 is a front perspective view of the tool holder with the throwaway tip of FIG. FIG. 6 is a front end view of the holder according to this embodiment, and FIG. 7 is a rear end view of the throw-away tip according to this embodiment.
[0017]
Here, in the throw-away drill according to the present embodiment, a detachable throw-away tip 2 is attached to the tip of the holder 1, and the axis 3 is coaxial with the tool holder 1 with respect to the work piece. The structure is such that cutting is performed by relatively rotating around. As shown in FIG. 1, the rear end portion of the throw-away tip 2 includes a tapered surface 4 that protrudes toward the rear end as it approaches the shaft center 3, and a locking surface 5 that faces in the tool reverse rotation direction during cutting. Is formed so as to protrude from above the tapered surface 4, and is provided with a rod-like portion 8 having a notch 7 that protrudes from the protruding end portion of the tapered surface 4 toward the tool holder 1 side and receives the fixing means 6. The tip of the tool holder 1 includes a concave tapered surface 9 that is recessed toward the proximal end as it approaches the axial center 3 so as to abut against the tapered surface 4 and is cut so as to abut against the locking surface 5. A locking receiving surface 10 that sometimes faces in the direction of tool rotation is formed so as to protrude from the concave tapered surface 9, and a fitting hole 11 is formed at the back end of the concave tapered surface 9 to be fitted with the rod-shaped portion 8. Further, in order to bring the distal end portion of the fixing means 6 into contact with the notch 7, the axial center 3 is approached obliquely with respect to the axial center 3 and from the distal end side to the proximal end side of the tool holder 1. Thus, the insertion hole (through hole) 12 of the fixing means 6 is provided.
[0018]
With the above-described configuration, the throw-away tip 2 is mounted on the holder 1 along the conical tapered surface, so that the throw-away tip 2 and the tool holder 1 are brought into contact with each other at the tapered surfaces, and are necessarily coaxial. Therefore, high machining accuracy without center deviation can be obtained.
[0019]
Further, since the throw-away tip 2 can be replaced only by operating the fixing means 6 attached to the insertion hole 12 near the tip of the holder 1, the operation is easy and the work efficiency is good.
[0020]
Further, the throw-away tip 2 is configured to be fixed to the holder 1 by pressing the front end surface of the notch 7 with the fixing means 6, and the abutment surface with respect to the attachment of the throw-away tip 2 to the holder 1. Is not slid. Therefore, even if the throw-away tip 2 is repeatedly attached and detached, there is no change in the holder 1 side and the clamping force does not decrease, so that the same holder can be used for a long time and it is economical.
[0021]
Further, the notch 7 is provided with a bottom surface 13 so that the tip of the fixing means 6 is brought into contact with the notch 7. The tool holder 1 tip side is perpendicular to the bottom surface 13 and is inclined with respect to the axis 3. An insertion hole 12 of the fixing means 6 is provided so as to approach the axis 3 as it goes from the base end to the base end side. Here, it is desirable that an angle α formed between the central axis 14 of the insertion hole 12 and the axis 3 is smaller than an angle β formed between the tapered surface 4 and the axis 3. In such a state, the force applied to the bottom surface 13 of the notch 7 acts so as to draw the tapered surface 4 into the concave tapered surface 9 on the holder 1 side, so that the tool is removed from the workpiece particularly after machining. At this time, it is possible to prevent the throw-away tip 2 from shifting to the tip side of the holder 1 due to friction between the throw-away tip 2 and the inner wall surface of the machining. As a result, damage to the inner wall surface of the machining can be suppressed and machining with high machining accuracy can be performed repeatedly.
[0022]
8 and 9 show rear end views of the throw-away tip 2 of a type in which the cross-sectional shape of the rod-like portion 8 on the rear end side of the throw-away tip is a polygon as another embodiment of the present invention. Yes. Thus, by making the cross section of the rod-shaped portion 8 polygonal, the rotational torque of cutting can be received not only on the locking surface 5 formed on the tapered surface 4 but also on the side surface of the rod-shaped portion 8. Thus, the throw-away tip 2 can be fixed to the holder 1 in a state where the restraint is particularly strengthened. In addition, since the degree of freedom of the shape and size of the engagement portion between the throw-away tip 2 and the holder 1 is increased, a variety of optimum tools according to the processing conditions such as making the holder with the same cutting edge shape and different characteristics. Can be provided in a rich state.
[0023]
Further, the present invention can be applied to various throw-away rotary cutting tools used for drilling by changing the cutting edge shape of the throw-away tip 2, and FIG. 10 shows an embodiment as a reamer tool. Show.
[0024]
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.
[0025]
【The invention's effect】
As described above, the throw-away rotary cutting tool according to claim 1 is a throw-away rotary cutting tool in which a throw-away tip is detachably attached to a tip portion of a tool holder, The end portion is formed of a tapered surface that protrudes toward the rear end side as it approaches the axial center, and a locking surface that faces in the tool reverse rotation direction at the time of cutting is formed to protrude from the tapered surface, and the tapered surface protruding end A rod-like portion having a notch that protrudes from the portion toward the tool holder and receives the fixing means, and the distal end portion of the tool holder is recessed toward the proximal end as it approaches the axial center so as to contact the tapered surface. A locking receiving surface that protrudes from above the concave taper surface and has a concave taper surface that faces the locking surface when cutting to contact the locking surface. A fitting hole is formed in the back end portion of the concave tapered surface so as to be formed and fitted with the rod-like portion, and further oblique with respect to the axial center so that the tip portion of the fixing means is brought into contact with the notch In addition, since the insertion hole of the fixing means is provided so as to approach the axial center from the tip end side to the base end side of the tool holder, the throw-away tip and the holder abut on the tapered surfaces inevitably. Since it is coaxial, highly accurate rotary cutting can be performed. Further, the throw-away tip can be easily replaced, the workability is excellent, and an economical throw-away rotary cutting tool with little holder deterioration can be obtained.
[0026]
Further, in the throw-away rotary cutting tool according to claim 2, the angle formed between the central axis of the insertion hole and the axis is smaller than the angle formed between the tapered surface and the axis, so that the machining is particularly performed. When the tool is later pulled away from the workpiece, the throwaway tip can be prevented from shifting toward the tip of the holder.
[0027]
Further, in the throw-away rotary cutting tool according to claim 3, since the cross-sectional shape of the throw-away tip rod-shaped portion is a polygon, the rotational torque of cutting can be received also by the rod-shaped portion, and the throw-away tip of the throw-away tip with respect to the rotation direction can be received. The restraint can be made stronger.
[Brief description of the drawings]
FIG. 1 is an exploded side view of a throw-away rotary cutting tool according to the present embodiment.
2 is a cross-sectional view showing a state in which the throw-away tip of FIG. 1 is mounted.
FIG. 3 is a perspective view of the rear end side of the tool holder in FIG. 1;
4 is a perspective view of the tip end side of the tool holder in FIG. 1. FIG.
5 is a perspective view of the tip end side of the tool holder with the throw-away tip of FIG. 4 attached. FIG.
FIG. 6 is a front view of the holder according to the present embodiment.
FIG. 7 is a rear end view of the throw-away tip according to the present embodiment.
FIG. 8 is a rear end view of the throw-away tip according to another embodiment of the present invention.
FIG. 9 is a rear end view of the throw-away tip according to another embodiment of the present invention.
FIG. 10 is a side view of a throw-away rotary cutting tool according to another embodiment of the present invention.
FIG. 11 is a side view of a conventional throw-away rotary cutting tool.
[Explanation of symbols]
1: Holder 2: Throw-away tip 3: Axis 4: Tapered surface 5: Locking surface 6: Fixing means 7: Notch 8: Bar-shaped portion 9: Concave taper surface 10: Locking receiving surface 11: Fitting hole 12 : Insertion hole 13: Bottom surface 14: Center axis α of the insertion hole α: Angle formed by the central axis of the insertion hole and the axial center β: Angle formed by the tapered surface and the axial center

Claims (3)

工具ホルダの先端部にスローアウェイチップが着脱可能に装着されてなるスローアウェイ式回転切削工具において、
前記スローアウェイチップの後端部は、前記スローアウェイチップの外周から軸心に近づくにつれて後端側へ突出するテーパー面と、該テーパー面の突端部から前記工具ホルダ側に突出し固定手段を受け入れる切り欠きを有する棒状部と、前記スローアウェイチップの外周から前記棒状部にわたって前記テーパー面に隣接するとともに切削時に工具逆回転方向に面する係止面と、を備えており、
前記工具ホルダの先端部は、前記工具ホルダの外周から軸心に近づくにつれて基端側へ窪んでいる凹テーパー面と、前記棒状部と嵌合すべく前記凹テーパー面の奥端部に形成された嵌合穴と、前記工具ホルダの外周から前記嵌合穴にわたって前記凹テーパー面に隣接するとともに切削時に工具回転方向に面する係止受け面と、前記工具ホルダの外周側から軸心に近づくにつれて前記工具ホルダの基端側に向かうように形成された貫通孔と、を備えており、
前記スローアウェイチップの前記テーパー面を前記工具ホルダの前記凹テーパー面に当接させるとともに、前記スローアウェイチップの前記係止面を前記工具ホルダの前記係止受け面に当接させ、前記貫通孔から挿入した前記固定手段で前記切り欠きの先端面を押し付けることにより前記スローアウェイチップを前記工具ホルダに固定する
ことを特徴とするスローアウェイ式回転切削工具。In the throw-away rotary cutting tool in which the throw-away tip is detachably attached to the tip of the tool holder,
Cut the rear end of the throw-away tip, to accept a tapered surface which projects toward the rear end closer to the axis from the outer periphery of the cutting insert, the projecting fastening means to the tool holder side from the projecting end of the tapered surface A rod-shaped portion having a notch, and a locking surface that is adjacent to the tapered surface across the rod-shaped portion from the outer periphery of the throw-away tip and faces the tool reverse rotation direction at the time of cutting ,
The tip portion of the tool holder, and a concave tapered surface is recessed from the outer periphery of the tool holder toward the proximal end side closer to the axis, are formed on the inner end portion of the concave tapered surface so as to mate with said rod portion A fitting receiving hole, an engagement receiving surface that is adjacent to the concave tapered surface from the outer periphery of the tool holder to the fitting hole and faces the tool rotating direction during cutting, and approaches the axial center from the outer peripheral side of the tool holder. And a through-hole formed so as to go toward the base end side of the tool holder ,
The tapered surface of the throwaway tip is brought into contact with the concave tapered surface of the tool holder, and the locking surface of the throwaway tip is brought into contact with the locking receiving surface of the tool holder, and the through hole The throw-away rotary cutting tool, wherein the throw-away tip is fixed to the tool holder by pressing the front end surface of the notch with the fixing means inserted from above . 前記貫通孔の中心軸と前記軸心とのなす角が前記テーパー面と前記軸心とのなす角よりも小さくなっていることを特徴とする請求項１に記載のスローアウェイ式回転切削工具。2. The throwaway rotary cutting tool according to claim 1, wherein an angle formed between a central axis of the through hole and the axis is smaller than an angle formed between the tapered surface and the axis. 前記棒状部の断面形状が多角形で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式回転切削工具。The throwaway rotary cutting tool according to claim 1 or 2, wherein a cross-sectional shape of the rod-like portion is a polygon.
JP2003067244A 2003-03-12 2003-03-12 Throw-away rotary cutting tool Expired - Fee Related JP4272455B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003067244A JP4272455B2 (en) 2003-03-12 2003-03-12 Throw-away rotary cutting tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003067244A JP4272455B2 (en) 2003-03-12 2003-03-12 Throw-away rotary cutting tool

Publications (2)

Publication Number Publication Date
JP2004276134A JP2004276134A (en) 2004-10-07
JP4272455B2 true JP4272455B2 (en) 2009-06-03

Family

ID=33284914

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003067244A Expired - Fee Related JP4272455B2 (en) 2003-03-12 2003-03-12 Throw-away rotary cutting tool

Country Status (1)

Country Link
JP (1) JP4272455B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927370A (en) * 2009-06-23 2010-12-29 山特维克知识产权股份有限公司 The rotatable tool and the loose top thereof that are used for smear removal processing

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10314889A1 (en) * 2003-04-01 2004-10-14 Komet Group Holding Gmbh Tool for machine tools
WO2008149371A1 (en) * 2007-06-06 2008-12-11 No Screw Ltd. A cutting tool holder and a cutting insert therefor
DE102009012725B4 (en) 2009-03-11 2020-10-15 Kennametal Inc. Drill tip and drill tool with a drill tip
DE102009013580A1 (en) * 2009-03-19 2010-09-23 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Modular drill
US11235397B2 (en) 2016-12-16 2022-02-01 Kennametal Inc. Side-activated modular drill
US11471952B2 (en) 2020-03-19 2022-10-18 Kennametal Inc. Cutting tool having replaceable cutting head and method of securing a replaceable cutting head
US11883888B2 (en) 2021-06-28 2024-01-30 Kennametal Inc. Modular drill with enhanced bump-off capability

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6292113U (en) * 1985-11-28 1987-06-12
JP3159297B2 (en) * 1996-01-10 2001-04-23 本田技研工業株式会社 Drill for deep hole
PT1200222E (en) * 1999-08-03 2003-08-29 Kennametal Inc SUBSTITUABLE THREAD DRILL

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927370A (en) * 2009-06-23 2010-12-29 山特维克知识产权股份有限公司 The rotatable tool and the loose top thereof that are used for smear removal processing
CN101927370B (en) * 2009-06-23 2015-05-13 山特维克知识产权股份有限公司 A rotatable tool for chip removing machining as well as a loose top therefor

Also Published As

Publication number Publication date
JP2004276134A (en) 2004-10-07

Similar Documents

Publication Publication Date Title
US7048480B2 (en) Twist drill with a replaceable cutting insert and a rotary cutting tool with a replaceable cutting insert
EP1864733B1 (en) Insert attaching/detaching type drill
JP5837317B2 (en) Rotating tool and loose top for cutting and base
JP2004501785A (en) Rotatable tool with interchangeable tips at the chip removal free end
JP2007038362A (en) Cutting tool
JP4129192B2 (en) Throwaway drill
JP4272455B2 (en) Throw-away rotary cutting tool
JPH07112643B2 (en) Drill
US20080101878A1 (en) Tool for cutting machining
KR100982788B1 (en) Adjustable double head cutting tools
JP2004306170A (en) Throwaway type drill and throwaway tip mounted thereon
JP2006247790A (en) Throw-away cutting tool
JP2005161434A (en) Drill
JPH0740141A (en) Reamer
KR20000062210A (en) Interference fit type cutting tool
JP4262049B2 (en) Cutting tools
JP2008023607A (en) Gun drill and drill body attached thereto
JP5287120B2 (en) Claw mechanism for throwaway rotary tool, tool body for throwaway rotary tool, and throwaway tip
JP2010274342A (en) Cutting tool
JP3835052B2 (en) Turning tool
JP4359918B2 (en) Throwaway drill and operation jig
JP2011115892A (en) Working tool
JP2005138258A (en) Drill
JP2007021646A (en) Tip holder exchange type drilling tool
KR100538268B1 (en) Rolling tool exchangeable of cutting-section

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050810

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070903

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080513

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080711

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20090203

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20090227

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120306

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4272455

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120306

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130306

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130306

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140306

Year of fee payment: 5

LAPS Cancellation because of no payment of annual fees