JP2013198966A - Fastening mechanism of cutting head, and head exchangeable cutting tool using the same - Google Patents

Fastening mechanism of cutting head, and head exchangeable cutting tool using the same Download PDF

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JP2013198966A
JP2013198966A JP2012069947A JP2012069947A JP2013198966A JP 2013198966 A JP2013198966 A JP 2013198966A JP 2012069947 A JP2012069947 A JP 2012069947A JP 2012069947 A JP2012069947 A JP 2012069947A JP 2013198966 A JP2013198966 A JP 2013198966A
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cutting head
fastening member
tool body
head
fastening
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JP5790566B2 (en
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優次 ▲高▼木
Yuji Takagi
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Mitsubishi Materials Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a fastening mechanism of a cutting head and a head exchangeable cutting tool capable of accurately and simply aligning the cutting head to a tool body and superior in versatility.SOLUTION: A fastening member 7 and a clamping member 8 are arranged in a hole 5 of a cylindrical cutting head 2, and a gradually diameter-decreasing head-tapered-face 12 is formed as directed to a reverse direction of a tool body 3 along a direction of a shaft O on an inner peripheral face of the hole 5. A gradually diameter-decreasing fastening-tapered-face 13 is formed as directed to the reverse side of the tool body 3 along the direction of the shaft O at a position corresponding to a distal end part 6 out of an outer peripheral face of the fastening member 7. The cutting head 2 is aligned at the distal end part 6 together with the fastening member 7 to be inserted in the fastening member 7 and the clamping member 8, and a screw member 9 screwed with the distal end part 6 is provided while the head tapered face 12 and the fastening tapered face 13 are mutually slid by screwing the clamping member 8 to pull up the fastening member 7.

Description

本発明は、切削ヘッドの締結機構及びこれを用いたヘッド交換式切削工具に関するものである。   The present invention relates to a fastening mechanism for a cutting head and a head exchangeable cutting tool using the same.

従来のヘッド交換式切削工具として、例えば、ＪＩＳ Ｂ ４２１４に規定されるシェルエンドミル（切削ヘッド）がＪＩＳ Ｂ ４２１６に規定されるカッタアーバ（工具本体）の先端部に装着されてなるものが知られている。シェルエンドミルは、筒状をなし、その軸方向に貫通する孔部と、前記軸方向を向く先端面及び前記軸方向に垂直な径方向を向く外周面に形成された切れ刃とを備えている。シェルエンドミルは、その孔部がカッタアーバの先端部（インロー部）に嵌合された状態で、ねじ部材等で固定される。そして、カッタアーバが工作機械の主軸等に装着され、その回転軸（中心軸）回りに回転させられることにより、シェルエンドミルの切れ刃で被削材を切削（転削）加工する。   As a conventional head-exchangeable cutting tool, for example, a shell end mill (cutting head) defined in JIS B 4214 is mounted on the tip of a cutter arbor (tool body) defined in JIS B 4216 is known. Yes. The shell end mill has a cylindrical shape, and includes a hole portion that penetrates in the axial direction, a tip surface that faces the axial direction, and a cutting edge that is formed on an outer peripheral surface that faces a radial direction perpendicular to the axial direction. . The shell end mill is fixed by a screw member or the like in a state where the hole portion is fitted to the tip end portion (inlay portion) of the cutter arbor. Then, the cutter arbor is mounted on the main shaft of the machine tool and is rotated around its rotation axis (center axis), thereby cutting (rolling) the workpiece with the cutting edge of the shell end mill.

この種のヘッド交換式切削工具では、切削加工の品位を確保するため、カッタアーバに対してシェルエンドミルを同軸（同心）に位置決め（芯合せ）する必要がある。
例えば、下記特許文献１に示されるヘッド交換式切削工具は、交換刃具（切削ヘッド）と、専用のシャンク（工具本体）と、シャンクに対して螺合により交換刃具を固定する取付ねじとを備えている。そして、取付ねじの胴部に設けられた嵌合軸部が、交換刃具及びシャンクの各嵌合穴に嵌合させられることにより、該嵌合軸部を介して、交換刃具とシャンクとが互いに同軸に芯合せされるようになっている。 In this type of head interchangeable cutting tool, it is necessary to position (center) the shell end mill coaxially (concentrically) with respect to the cutter arbor in order to ensure the quality of the cutting process.
For example, the head exchangeable cutting tool disclosed in Patent Document 1 below includes an exchange blade (cutting head), a dedicated shank (tool body), and a mounting screw for fixing the exchange blade to the shank by screwing. ing. Then, the fitting shaft provided on the body of the mounting screw is fitted into the fitting holes of the exchange blade and the shank, so that the exchange blade and the shank are mutually connected via the fitting shaft. It is designed to be coaxially aligned.

特開２００７−１６７９７７号公報JP 2007-167777 A

しかしながら、前述した従来のヘッド交換式切削工具では、下記の課題があった。
すなわち、一般的なシェルエンドミルとカッタアーバからなるヘッド交換式切削工具では、カッタアーバに対してシェルエンドミルを精度よく芯合せすることが難しかった。
一方、例えば上記特許文献１のように、専用の工具本体を用いることにより、該工具本体に対して切削ヘッドを比較的精度よく芯合せしやすくなるが、工具の構造が複雑となり、またこれらの嵌合（連結）部分においては高精度な研削加工等が必要であり、製造が複雑となっていた。特に、切削ヘッドは超硬合金等の硬質材料からなる焼結体で作製される場合があり、加工が難しかった。また、一般のカッタアーバ等を工具本体として用いることができないために、汎用性に課題を有していた。 However, the conventional head exchangeable cutting tool described above has the following problems.
That is, it is difficult to accurately align the shell end mill with the cutter arbor with a head exchangeable cutting tool composed of a general shell end mill and cutter arbor.
On the other hand, for example, as in the above-mentioned Patent Document 1, the use of a dedicated tool body makes it easy to align the cutting head with respect to the tool body with relatively high accuracy, but the structure of the tool becomes complicated, and these The fitting (connecting) portion requires high-precision grinding and the like, and manufacturing is complicated. In particular, the cutting head may be made of a sintered body made of a hard material such as a cemented carbide, which is difficult to process. Further, since a general cutter arbor or the like cannot be used as a tool body, there is a problem in versatility.

また、従来のヘッド交換式切削工具では、切削ヘッドの交換等の必要性から、該切削ヘッドと工具本体の先端部との嵌合部分は一般にすきま嵌めとされていて、芯合せの精度を十分に高めることは難しかった。   In addition, with conventional head-changing cutting tools, due to the necessity of exchanging the cutting head, etc., the fitting portion between the cutting head and the tip of the tool body is generally a clearance fit, so that the centering accuracy is sufficient. It was difficult to increase.

本発明は、このような事情に鑑みてなされたものであって、構造及び製造を複雑にすることなく、工具本体に対して切削ヘッドを精度よく同軸に簡単に芯合せでき、高品位な切削加工を安定して行うことができるとともに、該工具本体として一般のカッタアーバ等を用いることが可能であり、製造費用を削減でき、汎用性に優れた切削ヘッドの締結機構及びこれを用いたヘッド交換式切削工具を提供することを目的としている。   The present invention has been made in view of such circumstances, and the cutting head can be easily and accurately coaxially aligned with the tool main body without complicating the structure and manufacturing, and high-quality cutting. It is possible to stably perform machining, and it is possible to use a general cutter arbor as the tool body, reducing the manufacturing cost, and versatile cutting head fastening mechanism, and head replacement using this It aims at providing a type cutting tool.

このような課題を解決して、前記目的を達成するために、本発明は以下の手段を提案している。
すなわち、本発明は、軸状をなす工具本体の先端部に、筒状の切削ヘッドを締結するための切削ヘッドの締結機構であって、切削ヘッドは、その軸方向に貫通する孔部と、前記軸方向を向く先端面及び前記軸方向に垂直な径方向を向く外周面の少なくともいずれかに形成された切れ刃とを有し、前記切削ヘッドの孔部内には、前記工具本体の先端部の前記径方向の外側に嵌合可能な筒状の締結部材が設けられるとともに、この締結部材の前記軸方向に沿う前記工具本体とは反対側には、前記締結部材に螺合されることにより前記切削ヘッドに対して前記締結部材を前記工具本体とは反対側に引き上げ可能な筒状の締め付け部材が配設され、前記切削ヘッドの孔部の内周面には、前記軸方向に沿って前記工具本体とは反対側に向かうに従い漸次縮径するヘッドテーパ面が形成され、前記締結部材の外周面のうち、前記軸方向に沿う前記工具本体の先端部に対応する位置には、前記軸方向に沿って前記工具本体とは反対側に向かうに従い漸次縮径するとともに、前記ヘッドテーパ面に当接される締結テーパ面が形成されていて、前記締め付け部材をねじ込んで前記締結部材を引き上げることにより、前記ヘッドテーパ面と前記締結テーパ面とが互いに摺接しつつ、前記締結部材とともに前記切削ヘッドが前記工具本体の先端部に芯合せされ、前記締結部材及び前記締め付け部材に挿通されて、前記工具本体の先端部に穿設された雌ねじ部に螺合するねじ部材が設けられるとともに、前記ねじ部材をねじ込むことによって、該ねじ部材の頭部が前記締め付け部材を前記軸方向の前記工具本体側へ向けて押圧するようにしたことを特徴としている。
また、本発明は、切削ヘッドと、前記切削ヘッドが着脱可能に装着される工具本体と、を備えたヘッド交換式切削工具であって、前述の切削ヘッドの締結機構を用いたことを特徴としている。 In order to solve such problems and achieve the above object, the present invention proposes the following means.
That is, the present invention is a cutting head fastening mechanism for fastening a cylindrical cutting head to a tip portion of an axial tool body, the cutting head including a hole penetrating in the axial direction, A cutting edge formed on at least one of a front end surface facing the axial direction and an outer peripheral surface facing a radial direction perpendicular to the axial direction, and a front end portion of the tool main body in a hole of the cutting head A cylindrical fastening member that can be fitted to the outside in the radial direction is provided, and on the opposite side of the fastening member along the axial direction of the fastening member, the fastening member is screwed to the fastening member. A cylindrical fastening member capable of pulling up the fastening member to the opposite side of the tool main body with respect to the cutting head is disposed, and an inner peripheral surface of the hole of the cutting head extends along the axial direction. Gradually toward the opposite side of the tool body A head taper surface is formed, and a position corresponding to a tip end portion of the tool body along the axial direction on the outer peripheral surface of the fastening member is opposite to the tool body along the axial direction. A fastening taper surface that is gradually reduced in diameter toward the head and abutted against the head taper surface is formed, and by screwing the fastening member and pulling up the fastening member, the head taper surface and the fastening taper surface Are internally threaded with the cutting member being centered on the distal end portion of the tool main body and being inserted into the fastening member and the fastening member, and being drilled at the distal end portion of the tool main body. A screw member that is screwed onto the screw member, and screwing the screw member so that the head of the screw member causes the clamping member to move in the axial direction. It is characterized in that so as to press toward the side.
Further, the present invention is a head replaceable cutting tool comprising a cutting head and a tool body to which the cutting head is detachably mounted, wherein the cutting head fastening mechanism is used. Yes.

本発明の切削ヘッドの締結機構及びこれを用いたヘッド交換式切削工具では、切削ヘッドの孔部内に締結部材が設けられるとともに、この締結部材が工具本体の先端部（ホルダインロー部）の径方向外側に嵌合可能とされていて、該締結部材に螺合される締め付け部材を締め付けていくと（ねじ込んでいくと）、締結部材が切削ヘッド及び工具本体の先端部に対して、工具本体とは反対側（工具先端側）に向けて、移動させられる（引き上げられる）。   In the cutting head fastening mechanism and the head exchangeable cutting tool using the same according to the present invention, a fastening member is provided in the hole of the cutting head, and the fastening member serves as a radial direction of the tip end portion (holder inlay portion) of the tool body. When the fastening member that can be fitted to the outside and is screwed into the fastening member is tightened (screwed in), the fastening member is in contact with the cutting head and the tip of the tool body, Is moved (raised) toward the opposite side (tool tip side).

この移動にともなって、締結部材の締結テーパ面が、切削ヘッドのヘッドテーパ面に対して摺接されつつ強く押し付けられ、これにより締結部材と切削ヘッドとが同軸に芯合せされる。ここで、締結部材は工具本体の先端部に嵌合されて同軸とされているから、切削ヘッドは、該締結部材を介して工具本体に対しても精度よく芯合せされるようになっている。また、締結部材が弾性変形可能な材料で形成されている場合には、前述のように締結テーパ面とヘッドテーパ面とが摺接されていくときに、該締結部材における締結テーパ面部分は縮径させられて、この締結テーパ面の径方向内側に位置する工具本体の先端部に対して、締結部材が強固に嵌合することになり、これにより、あたかも締まり嵌めの如き作用を得ることができる。
つまり、締結部材を工具本体の先端部に取り付ける際には、これらの嵌合部分に僅かに隙間を設けて装着しやすくしつつも、次いで締め付け部材を締め付けていくことで、あたかも締結部材の内径を工具本体の先端部の外径よりも小さく形成してこれらを圧入させたような、強固な嵌合状態（取付剛性）及び高い求心性を得ることができるようになっている。 Along with this movement, the fastening taper surface of the fastening member is strongly pressed while being in sliding contact with the head taper surface of the cutting head, whereby the fastening member and the cutting head are coaxially aligned. Here, since the fastening member is fitted to the tip of the tool body and is coaxial, the cutting head is also accurately aligned with the tool body via the fastening member. . Further, when the fastening member is formed of an elastically deformable material, when the fastening tapered surface and the head tapered surface are brought into sliding contact as described above, the fastening tapered surface portion of the fastening member is contracted. The fastening member is firmly fitted to the distal end portion of the tool body positioned radially inside the fastening taper surface, thereby obtaining an action like an interference fit. it can.
In other words, when attaching the fastening member to the tip of the tool body, it is easy to mount the fitting part by providing a slight gap, but then tightening the fastening member, as if the inner diameter of the fastening member Is formed smaller than the outer diameter of the tip end portion of the tool main body, and a strong fitting state (attachment rigidity) and high centripetalness can be obtained.

具体的に、締め付け部材を締め付けていく際、切削ヘッドに対して締結部材が軸方向に沿って工具本体とは反対側に移動するとともに、切削ヘッドのヘッドテーパ面と、締結部材の締結テーパ面とが摺接しつつ互いに強く押し付け合うことで、切削ヘッドと締結部材とが同軸（同心）に位置決め（芯合せ）される。またこれと同時に、締結部材の締結テーパ面部分が縮径されていくことで、該締結部材の内周面と、工具本体の先端部の外周面とが互いに強く押し付け合い、締結部材と工具本体の先端部とも同軸に芯合せされる。
尚、このように締結部材を縮径させるまでに至らない場合であっても（つまり締結部材と工具本体の先端部とがすきま嵌めとされた状態であっても）、工具本体の先端部に対して切削ヘッドを精度よく芯合せできることは前述した通りである。 Specifically, when tightening the tightening member, the fastening member moves to the opposite side of the tool body along the axial direction with respect to the cutting head, and the head taper surface of the cutting head and the fastening taper surface of the fastening member Are strongly pressed against each other while being in sliding contact with each other, whereby the cutting head and the fastening member are positioned (centered) coaxially (concentrically). At the same time, the fastening taper surface portion of the fastening member is reduced in diameter so that the inner peripheral surface of the fastening member and the outer peripheral surface of the tip end portion of the tool body strongly press each other, and the fastening member and the tool body The front end of each is coaxially aligned.
Even if the fastening member does not reach the diameter reduction as described above (that is, even when the fastening member and the tip of the tool main body are in a clearance fit), the tip of the tool main body is On the other hand, the cutting head can be accurately aligned as described above.

このように、本発明によれば、簡単な構造を用いて、かつ、締め付け部材を締め付けるだけの簡単な作業によって、切削ヘッド、締結部材及び工具本体の先端部を同軸に精度よく芯合せできる。さらに、締め付け部材の締め付け量に応じて締結部材が縮径させられる場合には、これらの嵌合（連結）が、締まり嵌めの如く強固に行われて、取付剛性が十分に高められることになる。   As described above, according to the present invention, the cutting head, the fastening member, and the tip of the tool main body can be accurately and coaxially aligned with a simple structure and by a simple operation of fastening the fastening member. Further, when the diameter of the fastening member is reduced in accordance with the tightening amount of the fastening member, these fittings (connections) are performed firmly like an interference fit, and the mounting rigidity is sufficiently increased. .

さらに、切削ヘッドが例えば超硬合金等の硬質材料からなる焼結体で作製されていても、この切削ヘッドの孔部内を研削加工するようなことなく、該切削ヘッドを精度よく工具本体の回転軸（中心軸）に同軸に芯合せして装着できる。
また、工具本体に特別な構造を必要としないため、該工具本体として、例えばＪＩＳ Ｂ ４２１６に規定される一般のカッタアーバ等を用いることが可能である。 Furthermore, even if the cutting head is made of a sintered body made of a hard material such as cemented carbide, the cutting head can be rotated with high accuracy without grinding the inside of the hole of the cutting head. Can be mounted coaxially with the shaft (center axis).
Further, since a special structure is not required for the tool body, a general cutter arbor or the like defined in JIS B 4216 can be used as the tool body, for example.

従って、本発明によれば、構造及び製造を複雑にすることなく、工具本体に対して切削ヘッドを精度よく同軸に簡単に芯合せでき、高品位な切削加工を安定して行うことができるとともに、該工具本体として一般のカッタアーバ等を用いることが可能であり、製造費用を削減でき、汎用性に優れている。   Therefore, according to the present invention, the cutting head can be easily and accurately coaxially aligned with the tool body without complicating the structure and manufacturing, and high-quality cutting can be stably performed. A general cutter arbor or the like can be used as the tool body, manufacturing costs can be reduced, and versatility is excellent.

また、本発明の切削ヘッドの締結機構において、前記締め付け部材は、前記切削ヘッドの孔部内に収容されることとしてもよい。   In the cutting head fastening mechanism according to the present invention, the fastening member may be accommodated in a hole of the cutting head.

この場合、切削加工時に、締め付け部材が切削ヘッドから工具先端側に向けて突出するようなことがなく、よって被削材に接触することが防止されて、切削加工性が高められる。尚、さらにねじ部材の頭部が切削ヘッドの孔部内に収容されることとした場合には、切削加工性がより向上することから、好ましい。   In this case, at the time of cutting, the fastening member does not protrude from the cutting head toward the tip of the tool, and therefore, contact with the work material is prevented and cutting workability is improved. In addition, it is preferable that the head of the screw member is accommodated in the hole of the cutting head because the cutting workability is further improved.

また、本発明の切削ヘッドの締結機構において、前記切削ヘッドにおける前記軸方向に沿う前記工具本体側を向く端面と、前記工具本体における前記軸方向に沿う前記切削ヘッド側を向く端面との間に、これら端面に当接して緩衝部材が配設されることとしてもよい。   Moreover, in the fastening mechanism of the cutting head according to the present invention, between the end surface of the cutting head facing the tool body along the axial direction and the end surface of the tool body facing the cutting head along the axial direction. The buffer member may be disposed in contact with these end surfaces.

この場合、切削ヘッドは、前述したように締結部材を介して工具本体の先端部に固定（径方向支持）されるのみならず、緩衝部材を介しても工具本体に固定（軸方向支持）されることになり、よって工具本体に対する切削ヘッドの取り付け安定性が向上する。
また、切削ヘッドが例えば超硬合金等の硬質材料からなる場合に、緩衝部材が配設されていることで、該切削ヘッドが鋼材等からなる工具本体に直接接触して傷付けてしまうようなことが防止される。 In this case, the cutting head is not only fixed (radially supported) to the tip of the tool body via the fastening member as described above, but also fixed to the tool body (axially supported) via the buffer member. Therefore, the mounting stability of the cutting head with respect to the tool body is improved.
In addition, when the cutting head is made of a hard material such as cemented carbide, for example, the cushioning member is disposed, so that the cutting head is in direct contact with the tool body made of steel or the like and may be damaged. Is prevented.

本発明の切削ヘッドの締結機構及びこれを用いたヘッド交換式切削工具によれば、構造及び製造を複雑にすることなく、工具本体に対して切削ヘッドを精度よく同軸に簡単に芯合せでき、高品位な切削加工を安定して行うことができるとともに、該工具本体として一般のカッタアーバ等を用いることが可能であり、製造費用を削減でき、汎用性に優れている。   According to the fastening mechanism of the cutting head of the present invention and the head exchangeable cutting tool using the same, the cutting head can be easily and accurately coaxially aligned with the tool body without complicating the structure and manufacturing, High-quality cutting can be stably performed, and a general cutter arbor or the like can be used as the tool body, which can reduce manufacturing costs and is excellent in versatility.

本発明の一実施形態に係る切削ヘッドの締結機構を用いたヘッド交換式切削工具を示す斜視図である。It is a perspective view which shows the head exchange type cutting tool using the fastening mechanism of the cutting head which concerns on one Embodiment of this invention. 図１のヘッド交換式切削工具の分解斜視図である。It is a disassembled perspective view of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具の側断面図（縦断面図）である。FIG. 2 is a side sectional view (longitudinal sectional view) of the head exchangeable cutting tool of FIG. 1. 図１のヘッド交換式切削工具に用いられる締結部材の（ａ）斜視図、（ｂ）側断面図である。It is the (a) perspective view of the fastening member used for the head exchange type cutting tool of Drawing 1, and (b) side sectional view. 図１のヘッド交換式切削工具に用いられる締め付け部材の（ａ）斜視図、（ｂ）側面図である。It is the (a) perspective view and (b) side view of the clamping member used for the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具に用いられる緩衝部材の（ａ）斜視図、（ｂ）上面図である。It is the (a) perspective view of the buffer member used for the head exchange type cutting tool of Drawing 1, and (b) the top view. 図１のヘッド交換式切削工具において、切削ヘッドを工具本体の先端部に装着する手順を説明する図である。FIG. 2 is a diagram illustrating a procedure for mounting the cutting head on the tip of the tool body in the head exchangeable cutting tool of FIG. 1. 図１のヘッド交換式切削工具において、切削ヘッドを工具本体の先端部に装着する手順を説明する図である。FIG. 2 is a diagram illustrating a procedure for mounting the cutting head on the tip of the tool body in the head exchangeable cutting tool of FIG. 1.

以下、本発明の一実施形態に係る切削ヘッドの締結機構１及びこれを用いたヘッド交換式切削工具１０について、図面を参照して説明する。
図１に示されるように、ヘッド交換式切削工具１０は、シェルエンドミルである切削ヘッド２と、切削ヘッド２が着脱可能に装着されるカッタアーバ等である軸状の工具本体３とを備え、工具本体３が工作機械の主軸等に装着された状態で、その回転軸（中心軸）回りに回転させられることにより、切削ヘッド２の切れ刃４で被削材を切削（転削）加工する、刃部交換型の転削工具である。
本実施形態のヘッド交換式切削工具１０は、切削ヘッド２を工具本体３に装着（締結）する部分の構造（切削ヘッドの締結機構１）において、従来にない特有の構成を備えている。 Hereinafter, a cutting head fastening mechanism 1 according to an embodiment of the present invention and a head replaceable cutting tool 10 using the same will be described with reference to the drawings.
As shown in FIG. 1, a head exchangeable cutting tool 10 includes a cutting head 2 that is a shell end mill, and a shaft-shaped tool body 3 that is a cutter arbor or the like to which the cutting head 2 is detachably mounted. In a state where the main body 3 is mounted on the main shaft or the like of the machine tool, the work material is cut (rolled) by the cutting edge 4 of the cutting head 2 by being rotated around its rotation axis (center axis). This is a cutting tool with a blade replacement type.
The head replaceable cutting tool 10 of the present embodiment has a unique configuration that is not present in the structure of the portion (cutting head fastening mechanism 1) where the cutting head 2 is mounted (fastened) to the tool body 3.

図２及び図３に示されるように、本実施形態の切削ヘッドの締結機構１は、筒状をなし、その軸Ｏ方向に貫通する孔部５、及び、軸Ｏ方向の先端側を向く先端面２ａ及び軸Ｏ方向に垂直な径方向の外側を向く外周面２ｂの少なくともいずれかに形成された切れ刃４を有する切削ヘッド２と、切削ヘッド２の孔部５内に配設されるとともに、該切削ヘッド２が装着される工具本体３の先端部（ホルダインロー部）６の径方向の外側に嵌合可能な筒状の締結部材７と、同じく切削ヘッド２の孔部５内に配設されるとともに、軸Ｏ方向に沿う締結部材７の工具本体３とは反対側（つまり先端側）に位置して、締結部材７に螺合されることにより切削ヘッド２に対してこの締結部材７を工具本体３とは反対側に引き上げ可能な筒状の締め付け部材８とを備えている。
また、切削ヘッドの締結機構１は、締結部材７及び締め付け部材８に挿通されて、工具本体３の先端部６に穿設された雌ねじ部６ａに螺合するねじ部材９を備えており、ねじ部材９をねじ込むことによって、該ねじ部材９の頭部９ｂが締め付け部材８を軸Ｏ方向の工具本体３側（つまり基端側）へ向けて押圧するようにされている。
また、切削ヘッドの締結機構１は、切削ヘッド２における軸Ｏ方向に沿う工具本体３側（基端側）を向く端面２ｃと、工具本体３における軸Ｏ方向に沿う切削ヘッド２側（先端側）を向く端面３ａとの間に、これら端面２ｃ、３ａに当接して配設される緩衝部材１１を備えている。 As shown in FIGS. 2 and 3, the cutting head fastening mechanism 1 of the present embodiment has a cylindrical shape, a hole portion 5 that penetrates in the direction of the axis O, and a tip that faces the tip side in the direction of the axis O. The cutting head 2 having a cutting edge 4 formed on at least one of the surface 2a and the outer peripheral surface 2b facing the outside in the radial direction perpendicular to the direction of the axis O, and disposed in the hole 5 of the cutting head 2 The cylindrical fastening member 7 that can be fitted to the outer side in the radial direction of the distal end portion (holder inlay portion) 6 of the tool body 3 to which the cutting head 2 is mounted and the hole 5 of the cutting head 2 are also arranged. The fastening member 7 is positioned on the side opposite to the tool body 3 (that is, the tip side) of the fastening member 7 along the direction of the axis O and is screwed to the fastening member 7 so that the fastening member is attached to the cutting head 2. A cylindrical fastening member 8 capable of lifting 7 to the opposite side of the tool body 3; It is provided.
Further, the fastening mechanism 1 of the cutting head includes a screw member 9 that is inserted into the fastening member 7 and the fastening member 8 and is screwed into a female screw portion 6 a formed in the tip portion 6 of the tool body 3. By screwing the member 9, the head portion 9 b of the screw member 9 presses the fastening member 8 toward the tool main body 3 side (that is, the base end side) in the axis O direction.
The cutting head fastening mechanism 1 includes an end surface 2c facing the tool body 3 side (base end side) along the axis O direction in the cutting head 2, and a cutting head 2 side (tip side) along the axis O direction in the tool body 3. ) Is provided between the end surface 3a facing the) and a buffer member 11 disposed in contact with the end surfaces 2c and 3a.

ここで、切削ヘッド２の軸Ｏと、工具本体３の中心軸とは互いに同軸とされており、本明細書においては、この軸（中心軸）Ｏ方向に沿う工具本体３の切削ヘッド２側（図２における上側）を先端側といい、工具本体３の切削ヘッド２とは反対側（すなわち切削ヘッド２における工具本体３側、図２における下側）を基端側という。また、軸Ｏに垂直な方向（軸Ｏに直交する方向）を径方向といい、軸Ｏ回りに周回する方向を周方向という。
尚、本実施形態では、切削ヘッド２、工具本体３、締結部材７、締め付け部材８、ねじ部材９及び緩衝部材１１が、軸Ｏを共通軸として同軸に配置されている。 Here, the axis O of the cutting head 2 and the center axis of the tool body 3 are coaxial with each other. In this specification, the cutting head 2 side of the tool body 3 along the direction of the axis (center axis) O is used. The upper side in FIG. 2 is referred to as the distal end side, and the opposite side of the tool body 3 from the cutting head 2 (that is, the tool body 3 side in the cutting head 2 and the lower side in FIG. 2) is referred to as the proximal end side. A direction perpendicular to the axis O (a direction orthogonal to the axis O) is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.
In the present embodiment, the cutting head 2, the tool body 3, the fastening member 7, the fastening member 8, the screw member 9, and the buffer member 11 are arranged coaxially with the axis O as a common axis.

切削ヘッド２は、超硬合金等の硬質材料からなる焼結体で作製されている。
図１及び図２に示されるように、本実施形態では、切削ヘッド２の先端面２ａと外周面２ｂとに、周方向に間隔をあけてそれぞれ複数の切れ刃４が形成されている。図３に示されるように、切削ヘッド２の外径は、工具本体３の外径よりも僅かに大きくなっており、またこれにより、外周面２ｂに形成された切れ刃４は、工具本体３より径方向外側に突出して配置されている。 The cutting head 2 is made of a sintered body made of a hard material such as a cemented carbide.
As shown in FIGS. 1 and 2, in the present embodiment, a plurality of cutting edges 4 are formed on the distal end surface 2 a and the outer peripheral surface 2 b of the cutting head 2 at intervals in the circumferential direction. As shown in FIG. 3, the outer diameter of the cutting head 2 is slightly larger than the outer diameter of the tool body 3, so that the cutting edge 4 formed on the outer peripheral surface 2 b It is arranged to protrude more radially outward.

図３において、切削ヘッド２の孔部５は、その軸Ｏ方向の中央部分が他の部分よりも径方向内側に一段突出して形成されており、この中央部分がフランジ部５ａとなっている。また、孔部５のうち、フランジ部５ａの先端側に位置する先端孔部５ｂは、円柱穴状に形成されているとともに、切削ヘッド２の先端面２ａに開口している。また、孔部５のうち、フランジ部５ａの基端側に位置する基端孔部５ｃは、フランジ部５ａから基端側に向かうに従い漸次拡径するテーパ穴状に形成された面を有するとともに、切削ヘッド２の基端側を向く端面２ｃに開口している。
具体的に、切削ヘッド２の孔部５の内周面のうち、基端孔部５ｃに対応する部位は、軸Ｏ方向に沿って工具本体３とは反対側（先端側）に向かうに従い漸次縮径するヘッドテーパ面１２となっている。 In FIG. 3, the hole 5 of the cutting head 2 is formed such that the central portion in the axis O direction protrudes one step radially inward from the other portions, and this central portion is a flange portion 5a. In addition, among the hole portions 5, the distal end hole portion 5 b located on the distal end side of the flange portion 5 a is formed in a cylindrical hole shape and is open to the distal end surface 2 a of the cutting head 2. In addition, among the holes 5, the base end hole 5 c located on the base end side of the flange portion 5 a has a surface formed in a tapered hole shape that gradually increases in diameter from the flange portion 5 a toward the base end side. Opening is made in the end surface 2c facing the base end side of the cutting head 2.
Specifically, a portion of the inner peripheral surface of the hole 5 of the cutting head 2 corresponding to the base end hole 5c gradually increases along the axis O direction toward the side opposite to the tool body 3 (front end side). The head taper surface 12 is reduced in diameter.

また、図２において、切削ヘッド２の基端側を向く端面２ｃには、工具本体３の先端側を向く端面３ａに形成された後述する凸部３ｂに対応して、凹部２ｄが形成されている。図示の例では、工具本体３の端面３ａに凸部３ｂが周方向に等間隔をあけて一対形成されており、これに対応して切削ヘッド２の端面２ｃに、凹部２ｄが周方向に等間隔をあけて一対形成されている。これら切削ヘッド２の凹部２ｄと工具本体３の凸部３ｂとが係合されることにより、切削ヘッド２と工具本体３との軸Ｏ回りの相対回転が規制されるようになっている。尚、凸部３ｂ及び凹部２ｄの数は、前述した一対に限定されるものではなく、単一又は３つ以上であっても構わない。   In FIG. 2, a concave portion 2 d is formed on the end surface 2 c facing the proximal end side of the cutting head 2 corresponding to a convex portion 3 b described later formed on the end surface 3 a facing the distal end side of the tool body 3. Yes. In the illustrated example, a pair of convex portions 3b are formed on the end surface 3a of the tool body 3 at equal intervals in the circumferential direction. Correspondingly, the concave portion 2d is formed on the end surface 2c of the cutting head 2 in the circumferential direction. A pair is formed at intervals. By engaging the concave portion 2d of the cutting head 2 and the convex portion 3b of the tool body 3, relative rotation about the axis O between the cutting head 2 and the tool body 3 is restricted. In addition, the number of the convex part 3b and the recessed part 2d is not limited to a pair mentioned above, You may be single or 3 or more.

また、切削ヘッド２は、少なくともその孔部５の内周面、及び、基端側を向く端面２ｃが焼結肌とされており、つまりこれらの面は、研削加工されていない。具体的には、切削ヘッド２において、切れ刃４部分以外の部位は焼結肌であって、研削加工されていない。   In the cutting head 2, at least the inner peripheral surface of the hole 5 and the end surface 2c facing the base end side are sintered, that is, these surfaces are not ground. Specifically, in the cutting head 2, the part other than the cutting edge 4 is a sintered skin and is not ground.

工具本体３は、鋼材により形成されており、軸Ｏに垂直な断面が円形状をなしている。本実施形態の工具本体３は、例えばＪＩＳ Ｂ ４２１６に規定される公知のカッタアーバである。   The tool body 3 is made of steel, and a cross section perpendicular to the axis O has a circular shape. The tool body 3 of the present embodiment is a known cutter arbor specified in, for example, JIS B 4216.

図２及び図３に示されるように、工具本体３は、その先端部６が該先端部６以外の部位より小径に形成されている。工具本体３の先端部６は、円筒状をなしており、該先端部６の外径は、切削ヘッド２の基端孔部５ｃの内径より小さくなっている。また、工具本体３の先端部６の内周面には、雌ねじ部６ａが形成されている。   As shown in FIGS. 2 and 3, the tool main body 3 has a tip portion 6 having a smaller diameter than a portion other than the tip portion 6. The distal end portion 6 of the tool body 3 has a cylindrical shape, and the outer diameter of the distal end portion 6 is smaller than the inner diameter of the proximal end hole portion 5 c of the cutting head 2. An internal thread portion 6 a is formed on the inner peripheral surface of the tip portion 6 of the tool body 3.

工具本体３の先端部６以外の部位において先端側を向く端面３ａは、円環状をなしており、図２に示されるように、この端面３ａには、径方向に延びる直方体状の凸部３ｂが、先端部６を挟んで一対突設されている。また、図３において、工具本体３の先端部６の外周面における下端部と、端面３ａの内周縁部とが交差する部位には、円環溝状のぬすみ部３ｃが形成されている。   The end surface 3a facing the distal end side in a portion other than the distal end portion 6 of the tool body 3 has an annular shape. As shown in FIG. 2, the end surface 3a has a rectangular parallelepiped convex portion 3b extending in the radial direction. However, a pair of protrusions are provided with the front end portion 6 interposed therebetween. In FIG. 3, an annular groove-shaped thin portion 3 c is formed at a portion where the lower end portion of the outer peripheral surface of the tip portion 6 of the tool body 3 intersects the inner peripheral edge portion of the end surface 3 a.

締結部材７は、鋼材により形成されており、多段円筒状をなしている。
図４（ａ）（ｂ）に示されるように、締結部材７は、先端側に位置する円筒状の小径部７ａと、基端側に位置するテーパ筒状（切頭円錐筒状）の大径部７ｂと、これら小径部７ａと大径部７ｂとを繋ぐ円環板状の繋ぎ部７ｃとを有している。 The fastening member 7 is made of steel and has a multistage cylindrical shape.
As shown in FIGS. 4 (a) and 4 (b), the fastening member 7 includes a cylindrical small-diameter portion 7a positioned on the distal end side and a large tapered cylindrical (truncated conical cylindrical shape) positioned on the proximal end side. It has a diameter portion 7b and an annular plate-shaped connecting portion 7c that connects the small diameter portion 7a and the large diameter portion 7b.

図３において、締結部材７は、切削ヘッド２の孔部５に基端から先端側に向けて挿入されて、該孔部５内に収容されている。
締結部材７の小径部７ａの外径は、切削ヘッド２の孔部５におけるフランジ部５ａの内径よりも僅かに小さくなっており、該小径部７ａはフランジ部５ａ内に挿入されているとともに、該フランジ部５ａから先端側に向けて突出している。また、小径部７ａの外周面には、雄ねじ部７ｄが形成されている。 In FIG. 3, the fastening member 7 is inserted into the hole 5 of the cutting head 2 from the proximal end toward the distal end side and is accommodated in the hole 5.
The outer diameter of the small diameter portion 7a of the fastening member 7 is slightly smaller than the inner diameter of the flange portion 5a in the hole 5 of the cutting head 2, and the small diameter portion 7a is inserted into the flange portion 5a. It protrudes from the flange portion 5a toward the tip side. Moreover, the external thread part 7d is formed in the outer peripheral surface of the small diameter part 7a.

締結部材７の大径部７ｂの外径は、基端側に向かうに従い漸次拡径している。一方、大径部７ｂの内径は、軸Ｏ方向に沿って一定となっている。これにより、締結部材７の大径部７ｂは、基端側に向かうに従い漸次肉厚が厚くなっている。図３において、大径部７ｂの外周面は、切削ヘッド２の基端孔部５ｃの内周面（ヘッドテーパ面１２）に摺動可能に当接されている。また、大径部７ｂの内周面は、工具本体３の先端部６の外周面に摺動可能に当接されている。すなわち、締結部材７の大径部７ｂは、基端孔部５ｃに径方向内側から摺動可能に嵌合し、工具本体３の先端部６に径方向外側から摺動可能に嵌合している。   The outer diameter of the large-diameter portion 7b of the fastening member 7 is gradually increased toward the base end side. On the other hand, the inner diameter of the large diameter portion 7b is constant along the axis O direction. Thereby, the large diameter part 7b of the fastening member 7 is gradually thickened toward the base end side. In FIG. 3, the outer peripheral surface of the large diameter portion 7 b is slidably contacted with the inner peripheral surface (head tapered surface 12) of the base end hole portion 5 c of the cutting head 2. Further, the inner peripheral surface of the large diameter portion 7 b is slidably contacted with the outer peripheral surface of the tip end portion 6 of the tool body 3. That is, the large-diameter portion 7b of the fastening member 7 is fitted to the proximal end hole portion 5c so as to be slidable from the radially inner side, and is fitted to the distal end portion 6 of the tool body 3 so as to be slidable from the radially outer side. Yes.

具体的に、締結部材７の外周面のうち、軸Ｏ方向に沿う工具本体３の先端部６に対応する位置である大径部７ｂの外周面には、軸Ｏ方向に沿って工具本体３とは反対側（先端側）に向かうに従い漸次縮径するとともに、ヘッドテーパ面１２に当接される締結テーパ面１３が形成されている。また、図示の例では、締結部材７の大径部７ｂにおいて基端側を向く開口縁部と、工具本体３の端面３ａとの間には、隙間が設けられている。   Specifically, of the outer peripheral surface of the fastening member 7, the tool main body 3 extends along the axis O direction on the outer peripheral surface of the large diameter portion 7 b, which is a position corresponding to the tip portion 6 of the tool main body 3 along the axis O direction. A fastening taper surface 13 is formed which gradually decreases in diameter toward the opposite side (front end side) and contacts the head taper surface 12. In the illustrated example, a gap is provided between the opening edge portion facing the base end side of the large diameter portion 7 b of the fastening member 7 and the end surface 3 a of the tool body 3.

図３において、締結部材７の繋ぎ部７ｃと、該繋ぎ部７ｃの先端側に位置する切削ヘッド２のフランジ部５ａとの間には、隙間が設けられている。また、繋ぎ部７ｃと、該繋ぎ部７ｃの基端側に位置する工具本体３の先端部６の先端面６ｂとの間にも、隙間が設けられている。   In FIG. 3, a gap is provided between the connecting portion 7c of the fastening member 7 and the flange portion 5a of the cutting head 2 located on the distal end side of the connecting portion 7c. Further, a gap is also provided between the joint portion 7c and the distal end surface 6b of the distal end portion 6 of the tool body 3 located on the proximal end side of the joint portion 7c.

締め付け部材８は、鋼材により形成されており、円環板状をなしている。
図５（ａ）（ｂ）に示されるように、締め付け部材８において軸Ｏ方向を向く両端面のうち、先端側を向く端面８ａには、軸Ｏを挟んで一対の突起部８ｂが形成されている。突起部８ｂにおいて径方向外側を向く外周面は、この締め付け部材８の環状をなす本体部分の外周面に面一とされている。 The fastening member 8 is formed of a steel material and has an annular plate shape.
As shown in FIGS. 5A and 5B, a pair of protrusions 8 b are formed on the end surface 8 a facing the distal end side among the both end surfaces facing the direction of the axis O in the fastening member 8 with the axis O interposed therebetween. ing. The outer peripheral surface of the projection 8b facing the radially outer side is flush with the outer peripheral surface of the annular main body portion of the fastening member 8.

また、突起部８ｂにおいて径方向内側を向く内面８ｃは、軸Ｏに平行な平坦面とされており、軸Ｏを挟んで対向する一対の突起部８ｂの内面８ｃ同士は、互いに平行となっている。締め付け部材８の本体部分の内周面には、締結部材７の雄ねじ部７ｄに螺合する雌ねじ部８ｄが形成されている。突起部８ｂの内面８ｃは、この締め付け部材８を、締結部材７に対して周方向に回転させて締め付ける（ねじ込む）ためのレンチ等の工具が係合可能な工具係合部とされている。   In addition, the inner surface 8c facing radially inward in the protrusion 8b is a flat surface parallel to the axis O, and the inner surfaces 8c of the pair of protrusions 8b facing each other across the axis O are parallel to each other. Yes. On the inner peripheral surface of the main body portion of the fastening member 8, a female screw portion 8d that is screwed into the male screw portion 7d of the fastening member 7 is formed. The inner surface 8c of the protrusion 8b is a tool engaging portion that can be engaged with a tool such as a wrench for tightening (screwing) the fastening member 8 in the circumferential direction with respect to the fastening member 7.

図３において、締め付け部材８は、切削ヘッド２の孔部５内に収容されている。具体的に、締め付け部材８は、切削ヘッド２の先端孔部５ｂ内に収容されており、該締め付け部材８の基端側を向く端面８ｅは、切削ヘッド２の孔部５のフランジ部５ａに先端側から当接している。また、締め付け部材８の外周面と、先端孔部５ｂの内周面との間には、僅かに隙間が設けられている。   In FIG. 3, the fastening member 8 is accommodated in the hole 5 of the cutting head 2. Specifically, the fastening member 8 is accommodated in the distal end hole portion 5 b of the cutting head 2, and an end surface 8 e facing the proximal end side of the fastening member 8 is formed on the flange portion 5 a of the hole portion 5 of the cutting head 2. Abutting from the tip side. Further, a slight gap is provided between the outer peripheral surface of the fastening member 8 and the inner peripheral surface of the tip hole portion 5b.

締め付け部材８の雌ねじ部８ｄと締結部材７の雄ねじ部７ｄとが螺合した状態で、これら締め付け部材８及び締結部材７は、切削ヘッド２の孔部５内に収容・支持されている。また、締め付け部材８と締結部材７とが螺合により互いに係合された状態で、図３に示されるように、締結部材７の小径部７ａにおいて先端側を向く開口縁部は、締め付け部材８の先端側を向く端面８ａより基端側に後退して配置されている。   In a state where the female screw portion 8 d of the fastening member 8 and the male screw portion 7 d of the fastening member 7 are screwed together, the fastening member 8 and the fastening member 7 are accommodated and supported in the hole portion 5 of the cutting head 2. Further, as shown in FIG. 3, in the state where the fastening member 8 and the fastening member 7 are engaged with each other by screwing, the opening edge portion facing the front end side in the small diameter portion 7 a of the fastening member 7 is the fastening member 8. It is set back from the end surface 8a facing the distal end side toward the proximal end side.

緩衝部材１１は、鋼材により形成されており、円環板状をなしている。
図６（ａ）（ｂ）に示されるように、緩衝部材１１は、円弧板状をなす複数の外周部１１ａと、外周部１１ａより曲率半径の小さな円弧板状をなす複数の内周部１１ｂとが、周方向に交互に連結されることにより、全体として円環状を呈している。 The buffer member 11 is made of steel and has an annular plate shape.
As shown in FIGS. 6A and 6B, the buffer member 11 includes a plurality of outer peripheral portions 11a having an arc plate shape, and a plurality of inner peripheral portions 11b having an arc plate shape having a smaller radius of curvature than the outer peripheral portion 11a. Are alternately connected in the circumferential direction to form an annular shape as a whole.

緩衝部材１１において、周方向に隣り合う外周部１１ａ同士の間、及び、これら外周部１１ａ同士を繋ぐ内周部１１ｂの径方向外側に位置する部位は、矩形穴状に切り欠かれた切り欠き部１１ｃとなっている。本実施形態では、切り欠き部１１ｃが周方向に等間隔をあけて一対形成されている。   In the buffer member 11, a portion located between the outer peripheral portions 11 a adjacent to each other in the circumferential direction and on the radially outer side of the inner peripheral portion 11 b that connects the outer peripheral portions 11 a is cut out into a rectangular hole shape. It is part 11c. In the present embodiment, a pair of notches 11c are formed at equal intervals in the circumferential direction.

図２に示されるように、緩衝部材１１が工具本体３と切削ヘッド２との間に配設された状態で、緩衝部材１１の切り欠き部１１ｃには、工具本体３の凸部３ｂが挿通される。切り欠き部１１ｃにおける上面視コ字状の内面は、凸部３ｂに対して周方向及び径方向内側から当接又は近接され、これにより、緩衝部材１１と工具本体３との周方向及び径方向の相対移動が規制される。
また、緩衝部材１１の内周部１１ｂにおいて径方向内側を向く内面は、上面視円弧状をなしており、緩衝部材１１が工具本体３に装着された状態で、内周部１１ｂの前記内面は工具本体３の先端部６の外周面に当接又は近接して配置される。 As shown in FIG. 2, the protrusion 3 b of the tool body 3 is inserted into the notch 11 c of the buffer member 11 in a state where the buffer member 11 is disposed between the tool body 3 and the cutting head 2. Is done. The U-shaped inner surface of the cutout portion 11c is in contact with or close to the convex portion 3b from the inner side in the circumferential direction and the radial direction, whereby the circumferential direction and the radial direction between the buffer member 11 and the tool main body 3 are contacted. Relative movement is restricted.
Further, the inner surface of the inner peripheral portion 11b of the buffer member 11 facing radially inward is arcuate when viewed from above, and the inner surface of the inner peripheral portion 11b is in a state where the buffer member 11 is mounted on the tool body 3. The tool body 3 is disposed in contact with or close to the outer peripheral surface of the tip portion 6.

図３において、ねじ部材９は、雄ねじ部９ａと、該雄ねじ部９ａより大径の頭部９ｂとを備えている。ねじ部材９は、雄ねじ部９ａにおける頭部９ｂとは反対側の端部が基端側に向けられた状態で、切削ヘッド２の孔部５に先端から基端側へ向けて挿入される。具体的に、ねじ部材９の雄ねじ部９ａは、締め付け部材８の雌ねじ部８ｄ内及び締結部材７の小径部７ａ内に挿入されて、その基端側に位置する工具本体３の先端部６の雌ねじ部６ａに螺合される。   In FIG. 3, the screw member 9 includes a male screw portion 9a and a head portion 9b having a larger diameter than the male screw portion 9a. The screw member 9 is inserted into the hole 5 of the cutting head 2 from the distal end to the proximal end side with the end of the male threaded portion 9a opposite to the head portion 9b facing the proximal end. Specifically, the male threaded portion 9a of the screw member 9 is inserted into the female threaded portion 8d of the fastening member 8 and the small diameter portion 7a of the fastening member 7, and the distal end portion 6 of the tool body 3 located on the proximal end side thereof is inserted. Screwed onto the female screw portion 6a.

ねじ部材９をねじ込んだ状態で、ねじ部材９の頭部９ｂは、切削ヘッド２の先端孔部５ｂ内に収容されている。また、図３に符号１４で示されるものは、円環板状の座金である。座金１４は、締め付け部材８の端面８ａと、ねじ部材９の頭部９ｂにおいて基端側を向く端面とに当接されている。   With the screw member 9 screwed in, the head 9 b of the screw member 9 is accommodated in the tip hole portion 5 b of the cutting head 2. Also, what is indicated by reference numeral 14 in FIG. 3 is an annular plate washer. The washer 14 is in contact with the end surface 8 a of the fastening member 8 and the end surface of the head 9 b of the screw member 9 that faces the base end side.

次に、本実施形態の切削ヘッドの締結機構１及びこれを用いたヘッド交換式切削工具１０において、切削ヘッド２を工具本体３に取り付ける手順について説明する。   Next, a procedure for attaching the cutting head 2 to the tool body 3 in the cutting head fastening mechanism 1 and the head exchangeable cutting tool 10 using the same will be described.

まず、図７に示されるように、切削ヘッド２の孔部５に、締結部材７及び締め付け部材８を挿入して、これら締結部材７及び締め付け部材８を螺着するとともに、孔部５内に装着する。尚、この状態では、締結部材７の雄ねじ部７ｄと締め付け部材８の雌ねじ部８ｄとの螺合は、手指等を使った軽いねじ込み程度に抑えて、強くねじ込まずに仮止めとしておく。   First, as shown in FIG. 7, the fastening member 7 and the fastening member 8 are inserted into the hole 5 of the cutting head 2, the fastening member 7 and the fastening member 8 are screwed together, and the hole 5 is inserted into the hole 5. Installing. In this state, the screwing of the male screw portion 7d of the fastening member 7 and the female screw portion 8d of the fastening member 8 is suppressed to a light screw-in level using fingers or the like, and temporarily fixed without being screwed in strongly.

次いで、図８に示されるように、切削ヘッド２の端面２ｃと、工具本体３の端面３ａとの間に緩衝部材１１を介装して、前述の切削ヘッド２、締結部材７及び締め付け部材８を、工具本体３の先端部６に先端から基端側に向けて装着する。この際、締結部材７の大径部７ｂ内に、工具本体３の先端部６が挿入される。   Next, as shown in FIG. 8, the above-described cutting head 2, fastening member 7, and fastening member 8 are interposed between the end surface 2 c of the cutting head 2 and the end surface 3 a of the tool body 3 with a buffer member 11 interposed therebetween. Are attached to the distal end portion 6 of the tool body 3 from the distal end toward the proximal end side. At this time, the distal end portion 6 of the tool body 3 is inserted into the large diameter portion 7 b of the fastening member 7.

この状態から、レンチ等の工具を用いて、締結部材７に対して締め付け部材８を周方向にねじ込んで、締め付ける。このように締め付け部材８をねじ込んで締結部材７を工具先端側へ引き上げることにより、ヘッドテーパ面１２と締結テーパ面１３とが互いに摺接しつつ、締結部材７とともに切削ヘッド２が工具本体３の先端部６に芯合せされる。
次いで、図３に示されるように、ねじ部材９及び座金１４を切削ヘッド２の孔部５に先端から基端側に向けて挿入し、該ねじ部材９の雄ねじ部９ａと、工具本体３の先端部６の雌ねじ部６ａとを螺着する。 From this state, using a tool such as a wrench, the fastening member 8 is screwed in the circumferential direction with respect to the fastening member 7 and tightened. In this way, the fastening member 8 is screwed and the fastening member 7 is pulled up to the tool tip side, so that the head taper surface 12 and the fastening taper surface 13 are in sliding contact with each other, and the cutting head 2 together with the fastening member 7 is at the tip of the tool body 3. Centered on part 6.
Next, as shown in FIG. 3, the screw member 9 and the washer 14 are inserted into the hole portion 5 of the cutting head 2 from the distal end to the proximal end side, and the male screw portion 9 a of the screw member 9 and the tool body 3 The female screw portion 6a of the tip portion 6 is screwed.

以上説明した本実施形態の切削ヘッドの締結機構１及びこれを用いたヘッド交換式切削工具１０では、切削ヘッド２の孔部５内に締結部材７が設けられるとともに、この締結部材７が工具本体３の先端部６の径方向外側に嵌合可能とされていて、該締結部材７に螺合される締め付け部材８をねじ込み締め付けていくと、締結部材７が切削ヘッド２及び工具本体３の先端部６に対して、工具本体３とは反対側（工具先端側）に向けて、移動させられる（引き上げられる）。   In the cutting head fastening mechanism 1 and the head replaceable cutting tool 10 using the cutting head fastening mechanism 1 according to the present embodiment described above, the fastening member 7 is provided in the hole 5 of the cutting head 2, and the fastening member 7 is a tool body. When the fastening member 8 screwed into the fastening member 7 is screwed in and tightened, the fastening member 7 becomes the tip of the cutting head 2 and the tool body 3. The part 6 is moved (pulled up) toward the side opposite to the tool body 3 (tool tip side).

この移動にともなって、締結部材７の締結テーパ面１３が、切削ヘッド２のヘッドテーパ面１２に対して摺接されつつ強く押し付けられ、これにより締結部材７と切削ヘッド２とが同軸に芯合せされる。ここで、締結部材７は工具本体３の先端部６に嵌合されて同軸とされているから、切削ヘッド２は、該締結部材７を介して工具本体３に対しても精度よく芯合せされるようになっている。また、本実施形態においては、締結部材７が弾性変形可能な材料で形成されており、この場合、前述のように締結テーパ面１３とヘッドテーパ面１２とが摺接されていくときに、該締結部材７における締結テーパ面１３部分（大径部７ｂ）は縮径させられて、この締結テーパ面１３の径方向内側に位置する工具本体３の先端部６に対して、締結部材７の大径部７ｂが強固に嵌合することになり、これにより、あたかも締まり嵌めの如き作用を得ることができる。
つまり、締結部材７の大径部７ｂを工具本体３の先端部６に取り付ける際には、これらの嵌合部分に僅かに隙間を設けて装着しやすくしつつも、次いで締め付け部材８を締め付けていくことで、あたかも締結部材７の大径部７ｂの内径を工具本体３の先端部６の外径よりも小さく形成してこれらを圧入させたような、強固な嵌合状態（取付剛性）及び高い求心性を得ることができるようになっている。 Along with this movement, the fastening taper surface 13 of the fastening member 7 is strongly pressed while being in sliding contact with the head taper surface 12 of the cutting head 2, whereby the fastening member 7 and the cutting head 2 are coaxially aligned. Is done. Here, since the fastening member 7 is fitted to the tip portion 6 of the tool body 3 and is coaxial, the cutting head 2 is accurately aligned with the tool body 3 via the fastening member 7. It has become so. In this embodiment, the fastening member 7 is formed of an elastically deformable material. In this case, when the fastening taper surface 13 and the head taper surface 12 are brought into sliding contact as described above, The fastening taper surface 13 portion (large diameter portion 7 b) of the fastening member 7 is reduced in diameter so that the fastening member 7 is larger than the distal end portion 6 of the tool body 3 positioned on the radially inner side of the fastening taper surface 13. The diameter portion 7b is tightly fitted, and as a result, an action like an interference fit can be obtained.
That is, when attaching the large-diameter portion 7b of the fastening member 7 to the distal end portion 6 of the tool body 3, the fastening member 8 is then tightened while providing a slight gap in these fitting portions to facilitate mounting. As a result, the inner diameter of the large-diameter portion 7b of the fastening member 7 is made smaller than the outer diameter of the tip portion 6 of the tool body 3 and these are press-fitted into a strong fitting state (mounting rigidity) and High centripetalness can be obtained.

具体的に、締め付け部材８を締め付けていく際、切削ヘッド２に対して締結部材７が軸Ｏ方向に沿って工具本体３とは反対側（先端側）に移動するとともに、切削ヘッド２のヘッドテーパ面１２と、締結部材７の締結テーパ面１３とが摺接しつつ互いに強く押し付け合うことで、切削ヘッド２と締結部材７とが同軸（同心）に位置決め（芯合せ）される。またこれと同時に、締結部材７の大径部７ｂが縮径されていくことで、該締結部材７の大径部７ｂの内周面と、工具本体３の先端部６の外周面とが互いに強く押し付け合い、締結部材７と工具本体３の先端部６とも同軸に芯合せされる。
尚、このように締結部材７を縮径させるまでに至らない場合であっても（つまり締結部材７と工具本体３の先端部６とがすきま嵌めとされた状態であっても）、工具本体３の先端部６に対して切削ヘッド２を精度よく芯合せできることは前述した通りである。 Specifically, when the fastening member 8 is tightened, the fastening member 7 moves to the opposite side (tip side) to the tool body 3 along the axis O direction with respect to the cutting head 2, and the head of the cutting head 2. The cutting head 2 and the fastening member 7 are coaxially (concentrically) positioned (centered) by strongly pressing each other while the taper surface 12 and the fastening taper surface 13 of the fastening member 7 are in sliding contact with each other. At the same time, the large-diameter portion 7b of the fastening member 7 is reduced in diameter so that the inner peripheral surface of the large-diameter portion 7b of the fastening member 7 and the outer peripheral surface of the tip portion 6 of the tool body 3 are mutually connected. Pressing strongly, the fastening member 7 and the tip 6 of the tool body 3 are also coaxially aligned.
Even when the diameter of the fastening member 7 is not reduced as described above (that is, even when the fastening member 7 and the tip portion 6 of the tool body 3 are in a clearance fit), the tool body As described above, the cutting head 2 can be accurately aligned with respect to the tip portion 6 of the three.

このように、本実施形態によれば、簡単な構造を用いて、かつ、締め付け部材８を締め付けるだけの簡単な作業によって、切削ヘッド２、締結部材７及び工具本体３の先端部６を同軸に精度よく芯合せできる。さらに、本実施形態では締め付け部材８の締め付け量に応じて締結部材７が縮径させられるので、これらの嵌合（連結）が、締まり嵌めの如く強固に行われて、取付剛性が十分に高められることになる。   As described above, according to the present embodiment, the cutting head 2, the fastening member 7, and the distal end portion 6 of the tool body 3 are coaxially arranged by a simple operation using a simple structure and by simply fastening the fastening member 8. Accurate alignment is possible. Further, in the present embodiment, the fastening member 7 is reduced in diameter in accordance with the tightening amount of the fastening member 8, so that these fittings (connections) are performed firmly like an interference fit and the mounting rigidity is sufficiently increased. Will be.

さらに、本実施形態のように、切削ヘッド２が超硬合金等の硬質材料からなる焼結体で作製されていても、この切削ヘッド２の孔部５内を研削加工するようなことなく、該切削ヘッド２を精度よく工具本体３の回転軸（中心軸）に同軸に芯合せして装着できる。
また、工具本体３に特別な構造を必要としないため、該工具本体３として、本実施形態のようなＪＩＳ規格のカッタアーバ等を用いることが可能である。 Furthermore, even if the cutting head 2 is made of a sintered body made of a hard material such as a cemented carbide as in the present embodiment, the inside of the hole 5 of the cutting head 2 is not ground. The cutting head 2 can be accurately mounted coaxially with the rotation axis (center axis) of the tool body 3.
Since the tool body 3 does not require a special structure, a JIS standard cutter arbor or the like as in the present embodiment can be used as the tool body 3.

従って、本実施形態によれば、構造及び製造を複雑にすることなく、工具本体３に対して切削ヘッド２を精度よく同軸に簡単に芯合せでき、高品位な切削加工を安定して行うことができるとともに、該工具本体３として一般のカッタアーバ等を用いることが可能であり、製造費用を削減でき、汎用性に優れている。   Therefore, according to the present embodiment, the cutting head 2 can be easily and accurately coaxially aligned with the tool body 3 without complicating the structure and manufacturing, and high-quality cutting can be stably performed. In addition, a general cutter arbor or the like can be used as the tool body 3, and the manufacturing cost can be reduced and the versatility is excellent.

また、締め付け部材８が、切削ヘッド２の孔部５内に収容されているので、切削加工時に、該締め付け部材８が切削ヘッド２から工具先端側に向けて突出して配置されるようなことがなく、よって被削材に接触することが防止されて、切削加工性が高められる。尚、本実施形態では、ねじ部材９の頭部９ｂも切削ヘッド２の孔部５内に収容されていることから、前述の効果がより顕著に得られる。   In addition, since the fastening member 8 is accommodated in the hole 5 of the cutting head 2, the fastening member 8 may be disposed so as to protrude from the cutting head 2 toward the tool tip side during cutting. Therefore, contact with the work material is prevented and cutting workability is improved. In the present embodiment, since the head 9b of the screw member 9 is also accommodated in the hole 5 of the cutting head 2, the above-described effects can be obtained more remarkably.

また、切削ヘッド２の基端側を向く端面２ｃと、工具本体３の先端側を向く端面３ａとの間に、これら端面２ｃ、３ａに当接して緩衝部材１１が配設されているので、下記の効果を奏する。
すなわち、切削ヘッド２は、前述したように締結部材７を介して工具本体３の先端部６に固定（径方向支持）されるのみならず、緩衝部材１１を介しても工具本体３に固定（軸Ｏ方向支持）されることになり、よって工具本体３に対する切削ヘッド２の取り付け安定性が向上する。
また、本実施形態のように切削ヘッド２が超硬合金等の硬質材料からなる場合に、緩衝部材１１が配設されていることで、該切削ヘッド２が鋼材からなる工具本体３に直接接触して傷付けてしまうようなことが防止される。 Further, since the buffer member 11 is disposed between the end surface 2c facing the base end side of the cutting head 2 and the end surface 3a facing the distal end side of the tool body 3 in contact with the end surfaces 2c and 3a, The following effects are achieved.
That is, the cutting head 2 is not only fixed (radially supported) to the distal end portion 6 of the tool body 3 via the fastening member 7 as described above, but also fixed to the tool body 3 via the buffer member 11 ( Therefore, the mounting stability of the cutting head 2 with respect to the tool body 3 is improved.
Further, when the cutting head 2 is made of a hard material such as cemented carbide as in the present embodiment, the cushioning member 11 is provided so that the cutting head 2 directly contacts the tool body 3 made of steel. Thus, it is prevented from being damaged.

尚、本発明は前述の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。   The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

例えば、前述の実施形態では、切削ヘッド２が超硬合金からなる焼結体であるとしたが、これに限定されるものではなく、例えば超硬合金以外の高速度鋼（ＨＳＳ）等からなる切削ヘッド２や、刃先にのみ超硬合金からなる切削インサートが着脱可能に装着される切削ヘッド２であっても構わない。   For example, in the above-described embodiment, the cutting head 2 is a sintered body made of cemented carbide, but is not limited thereto, and is made of, for example, high speed steel (HSS) other than cemented carbide. The cutting head 2 or the cutting head 2 to which a cutting insert made of cemented carbide is detachably attached only to the cutting edge may be used.

また、前述の実施形態では、工具本体３がＪＩＳ Ｂ ４２１６に規定される公知のカッタアーバであるとしたが、これに限定されるものではなく、例えば各種工作機械に対応した専用の工具本体３等であっても構わない。   In the above-described embodiment, the tool body 3 is a known cutter arbor specified in JIS B 4216. However, the present invention is not limited to this. For example, a dedicated tool body 3 corresponding to various machine tools, etc. It does not matter.

また、前述の実施形態においては、刃部一体型のシェルタイプ工具を用いて説明したが、それ以外の切削工具（例えばエンドミルタイプ、正面フライスタイプ等）にも本発明を適用可能である。   In the above-described embodiments, the blade type integrated shell type tool has been described. However, the present invention can be applied to other cutting tools (for example, an end mill type, a face milling type, etc.).

１ 切削ヘッドの締結機構
２ 切削ヘッド
２ａ 先端面
２ｂ 外周面
２ｃ 端面
３ 工具本体
３ａ 端面
４ 切れ刃
５ 孔部
６ 工具本体の先端部
６ａ 雌ねじ部
７ 締結部材
８ 締め付け部材
９ ねじ部材
９ｂ 頭部
１０ ヘッド交換式切削工具
１１ 緩衝部材
１２ ヘッドテーパ面
１３ 締結テーパ面
Ｏ 軸 DESCRIPTION OF SYMBOLS 1 Cutting head fastening mechanism 2 Cutting head 2a Tip surface 2b Outer peripheral surface 2c End surface 3 Tool body 3a End surface 4 Cutting edge 5 Hole 6 Tool tip 6a Female thread 7 Fastening member 8 Tightening member 9 Screw member 9b Head 10 Head replaceable cutting tool 11 Buffer member 12 Head taper surface 13 Fastening taper surface O-axis

Claims (4)

軸状をなす工具本体の先端部に、筒状の切削ヘッドを締結するための切削ヘッドの締結機構であって、
切削ヘッドは、その軸方向に貫通する孔部と、前記軸方向を向く先端面及び前記軸方向に垂直な径方向を向く外周面の少なくともいずれかに形成された切れ刃とを有し、
前記切削ヘッドの孔部内には、前記工具本体の先端部の前記径方向の外側に嵌合可能な筒状の締結部材が設けられるとともに、この締結部材の前記軸方向に沿う前記工具本体とは反対側には、前記締結部材に螺合されることにより前記切削ヘッドに対して前記締結部材を前記工具本体とは反対側に引き上げ可能な筒状の締め付け部材が配設され、
前記切削ヘッドの孔部の内周面には、前記軸方向に沿って前記工具本体とは反対側に向かうに従い漸次縮径するヘッドテーパ面が形成され、
前記締結部材の外周面のうち、前記軸方向に沿う前記工具本体の先端部に対応する位置には、前記軸方向に沿って前記工具本体とは反対側に向かうに従い漸次縮径するとともに、前記ヘッドテーパ面に当接される締結テーパ面が形成されていて、
前記締め付け部材をねじ込んで前記締結部材を引き上げることにより、前記ヘッドテーパ面と前記締結テーパ面とが互いに摺接しつつ、前記締結部材とともに前記切削ヘッドが前記工具本体の先端部に芯合せされ、
前記締結部材及び前記締め付け部材に挿通されて、前記工具本体の先端部に穿設された雌ねじ部に螺合するねじ部材が設けられるとともに、前記ねじ部材をねじ込むことによって、該ねじ部材の頭部が前記締め付け部材を前記軸方向の前記工具本体側へ向けて押圧するようにしたことを特徴とする切削ヘッドの締結機構。 A cutting head fastening mechanism for fastening a cylindrical cutting head to the tip of a shaft-shaped tool body,
The cutting head has a hole portion penetrating in the axial direction, a cutting edge formed on at least one of a tip surface facing the axial direction and an outer peripheral surface facing a radial direction perpendicular to the axial direction,
In the hole of the cutting head, a cylindrical fastening member that can be fitted to the radially outer side of the tip of the tool body is provided, and the tool body along the axial direction of the fastening member is On the opposite side, a cylindrical fastening member is disposed that can be pulled up to the opposite side of the tool body with respect to the cutting head by being screwed to the fastening member.
On the inner peripheral surface of the hole of the cutting head, a head taper surface that gradually decreases in diameter along the axial direction toward the opposite side of the tool body is formed.
Of the outer peripheral surface of the fastening member, at a position corresponding to the tip portion of the tool body along the axial direction, the diameter gradually decreases toward the opposite side of the tool body along the axial direction, and A fastening taper surface that is in contact with the head taper surface is formed,
By screwing the fastening member and pulling up the fastening member, the cutting head is aligned with the tip of the tool body together with the fastening member while the head taper surface and the fastening taper surface are in sliding contact with each other.
A screw member that is inserted through the fastening member and the fastening member and is screwed into a female screw portion that is drilled at a tip portion of the tool body is provided, and a head portion of the screw member is formed by screwing the screw member. The cutting head fastening mechanism is configured to press the fastening member toward the tool body in the axial direction. 請求項１に記載の切削ヘッドの締結機構であって、
前記締め付け部材は、前記切削ヘッドの孔部内に収容されることを特徴とする切削ヘッドの締結機構。 A fastening mechanism for a cutting head according to claim 1,
The fastening mechanism for a cutting head, wherein the fastening member is accommodated in a hole of the cutting head. 請求項１又は２に記載の切削ヘッドの締結機構であって、
前記切削ヘッドにおける前記軸方向に沿う前記工具本体側を向く端面と、前記工具本体における前記軸方向に沿う前記切削ヘッド側を向く端面との間に、これら端面に当接して緩衝部材が配設されることを特徴とする切削ヘッドの締結機構。 A fastening mechanism for a cutting head according to claim 1 or 2,
A buffer member is disposed between the end face of the cutting head facing the tool body along the axial direction and the end face of the tool body facing the cutting head along the axial direction. A cutting head fastening mechanism. 切削ヘッドと、
前記切削ヘッドが着脱可能に装着される工具本体と、を備えたヘッド交換式切削工具であって、
請求項１〜３のいずれか一項に記載の切削ヘッドの締結機構を用いたことを特徴とするヘッド交換式切削工具。 A cutting head;
A tool body on which the cutting head is detachably mounted, and a head replaceable cutting tool comprising:
A head replaceable cutting tool using the cutting head fastening mechanism according to any one of claims 1 to 3.
JP2012069947A 2012-03-26 2012-03-26 Fastening mechanism for cutting head and head exchangeable cutting tool using the same Active JP5790566B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106956028A (en) * 2017-04-10 2017-07-18 成都亨通兆业精密机械有限公司 A kind of milling cutter clamping device being easily installed
JP2019042893A (en) * 2017-09-05 2019-03-22 三菱マテリアル株式会社 cutter
WO2021029211A1 (en) * 2019-08-09 2021-02-18 株式会社Moldino Head-exchangeable cutting tool, cutting head, and tool body

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106956028A (en) * 2017-04-10 2017-07-18 成都亨通兆业精密机械有限公司 A kind of milling cutter clamping device being easily installed
JP2019042893A (en) * 2017-09-05 2019-03-22 三菱マテリアル株式会社 cutter
WO2021029211A1 (en) * 2019-08-09 2021-02-18 株式会社Moldino Head-exchangeable cutting tool, cutting head, and tool body

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