JP2012179685A - Head exchange type cutting tool - Google Patents

Head exchange type cutting tool Download PDF

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JP2012179685A
JP2012179685A JP2011045015A JP2011045015A JP2012179685A JP 2012179685 A JP2012179685 A JP 2012179685A JP 2011045015 A JP2011045015 A JP 2011045015A JP 2011045015 A JP2011045015 A JP 2011045015A JP 2012179685 A JP2012179685 A JP 2012179685A
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holder
head
central axis
cutting tool
cutting
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優次 ▲高▼木
Yuji Takagi
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Mitsubishi Materials Corp
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Mitsubishi Materials Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a head exchange type cutting tool in which a cutting head and a holder can be accurately and simply centered without making a manufacturing process complicated.SOLUTION: The head exchange type cutting tool includes: a cutting head 2 having a cutting edge; a holder 3 on which the cutting head 2 is attachably/detachably mounted; and a pin member 4 which fixes the cutting head 2 onto the holder 3 by screwing. The cutting tool is characterized in that the holder 3 is provided with a cylinder part 5 which is made coaxial with the center axis C1 of the holder 3 and which is elastically deformable outward in the radial direction perpendicular to the center axis C1, that the cutting head 2 is arranged outward in the radial direction of the cylinder part 5 and is provided with a contact part 8C on which the cylinder part 5 can be abutted, and that the pin member 4 is provided with an expanding part 4C which comes into contact with the cylinder part 5 internally in the radial direction to elastically deform the cylinder part 5 outwardly in the radial direction.

Description

本発明は、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 head exchangeable cutting tool.

従来、この種のヘッド交換式切削工具として、例えば下記特許文献１に示されるように、円柱状をなしその外周面に切れ刃を有する交換刃具（切削ヘッド）と、軸状をなしその先端部に交換刃具が着脱可能に装着されるシャンク（ホルダ）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（ピン部材）と、を備えたものが知られている。   Conventionally, as this type of head-exchangeable cutting tool, for example, as shown in Patent Document 1 below, a replacement blade (cutting head) having a cylindrical shape and having a cutting edge on its outer peripheral surface, and a shaft-shaped tip portion thereof. A shank (holder) on which a replacement blade is detachably mounted and a mounting screw (pin member) for fixing the replacement blade to the shank by screwing is known.

特許文献１のヘッド交換式切削工具では、取付ねじに設けられた嵌合軸部が、交換刃具に設けられた嵌合穴、及び、シャンクに設けられた嵌合穴に嵌合させられることにより、前記嵌合軸部を介して、交換刃具とシャンクとが同軸（同心）に位置決め（芯合せ）されるようになっている。   In the head replaceable cutting tool of Patent Document 1, the fitting shaft provided on the mounting screw is fitted into the fitting hole provided in the exchange blade and the fitting hole provided in the shank. The replacement blade and the shank are positioned coaxially (concentrically) via the fitting shaft portion.

特開２００７−１６７９７７号公報JP 2007-167777 A

しかしながら、前記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、切削ヘッドとホルダとを精度よく同軸に位置決めするため、ピン部材の嵌合部分（前記嵌合軸部）、切削ヘッドの嵌合穴及びホルダの嵌合穴を高精度に研磨加工する必要があり、製造工程が複雑となっていた。特に切削ヘッドは、硬質の超硬合金等からなるため研磨加工しづらい。 However, the conventional head exchangeable cutting tool has the following problems.
That is, in order to accurately and coaxially position the cutting head and the holder, it is necessary to polish the fitting portion of the pin member (the fitting shaft portion), the fitting hole of the cutting head, and the fitting hole of the holder with high accuracy. The manufacturing process was complicated. In particular, the cutting head is made of a hard cemented carbide or the like, and is difficult to polish.

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、製造工程を複雑にすることなく、切削ヘッドとホルダとを精度よく簡単に芯合せできる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 provides a head replaceable cutting tool capable of accurately and easily aligning a cutting head and a holder without complicating the manufacturing process. It is aimed.

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、切れ刃を有する切削ヘッドと、前記切削ヘッドが着脱可能に装着されるホルダと、前記ホルダに対して螺合により前記切削ヘッドを固定するピン部材と、を備えたヘッド交換式切削工具であって、前記ホルダは、該ホルダの中心軸に同軸とされ、該中心軸に垂直な径方向の外方に向けて弾性変形可能な筒部を有し、前記切削ヘッドは、前記筒部の前記径方向の外方に配置され該筒部が当接可能な当接部を有し、前記ピン部材は、前記筒部に前記径方向の内方から当接して該筒部を前記径方向の外方へ向けて弾性変形させる押し拡げ部を有することを特徴とする。 In order to achieve the above object, the present invention proposes the following means.
That is, the present invention provides a head replacement comprising a cutting head having a cutting edge, a holder to which the cutting head is detachably mounted, and a pin member for fixing the cutting head to the holder by screwing. The holder is coaxial with a central axis of the holder, and has a cylindrical portion that is elastically deformable outward in a radial direction perpendicular to the central axis. The cylindrical portion has an abutting portion that is disposed on the outer side in the radial direction and on which the cylindrical portion can abut, and the pin member abuts on the cylindrical portion from the inner side in the radial direction. It has a push-expansion part which elastically deforms toward the outward of the radial direction.

本発明のヘッド交換式切削工具によれば、下記の作用効果を奏する。
すなわち、切削ヘッドをホルダに装着する際、ピン部材の押し拡げ部が、ホルダの筒部に前記径方向の内方から当接するとともに該筒部を前記径方向の外方に向けて弾性変形させ、押し拡げる。これにより、ピン部材の中心軸と、ホルダの中心軸とが同軸に位置決めされる。
さらに、弾性変形させられた筒部が、その前記径方向の外方に位置する切削ヘッドの当接部に当接する。これにより、ホルダの中心軸と、切削ヘッドの中心軸とが同軸に位置決めされる。 The head exchangeable cutting tool of the present invention has the following effects.
That is, when the cutting head is mounted on the holder, the expanded portion of the pin member abuts against the cylindrical portion of the holder from the inside in the radial direction and elastically deforms the cylindrical portion toward the outside in the radial direction. , Expand. Thereby, the central axis of the pin member and the central axis of the holder are positioned coaxially.
Furthermore, the elastically deformed cylinder part comes into contact with the contact part of the cutting head located outward in the radial direction. Thereby, the central axis of the holder and the central axis of the cutting head are positioned coaxially.

このように、ホルダの筒部を弾性変形させ、切削ヘッドの当接部に当接させることによって、ホルダと切削ヘッドとの芯合せ（芯出し）が行われることから、前記従来の嵌合による芯合せとは異なり、本発明のヘッド交換式切削工具によれば、筒部、当接部及び押し拡げ部に対して高精度な研磨加工は不要である。具体的に、このヘッド交換式切削工具によれば、筒部、当接部及び押し拡げ部に対してラフな研磨加工のみ、或いは研磨レスとすることができる。特に、硬質の超硬合金等からなる切削ヘッドに対して研磨が不要であり、焼結後の状態をそのまま切削加工に用いることができる点で優れている。   In this way, the cylindrical portion of the holder is elastically deformed and brought into contact with the contact portion of the cutting head, so that the centering (centering) between the holder and the cutting head is performed. Unlike centering, according to the head replaceable cutting tool of the present invention, high-precision polishing is not required for the cylindrical portion, the abutting portion, and the expanded portion. Specifically, according to the head exchangeable cutting tool, only rough polishing or no polishing can be performed with respect to the cylindrical portion, the abutting portion, and the expanded portion. In particular, it is excellent in that polishing is unnecessary for a cutting head made of a hard cemented carbide or the like, and the state after sintering can be used for cutting as it is.

よって、本発明によれば、製造工程を複雑にすることなく、切削ヘッドとホルダとを精度よく簡単に芯合せすることができるのである。   Therefore, according to the present invention, the cutting head and the holder can be aligned accurately and easily without complicating the manufacturing process.

また、本発明のヘッド交換式切削工具において、前記筒部は、前記ホルダの中心軸回りの周方向に沿って分割されるように形成された複数の壁部を有することとしてもよい。   In the head exchangeable cutting tool of the present invention, the cylindrical portion may have a plurality of wall portions formed so as to be divided along a circumferential direction around the central axis of the holder.

この場合、筒部が前記周方向に分割されるように形成された複数の壁部を有しているので、ピン部材が該筒部を径方向の外方に向けて押し拡げる際に、筒部がより弾性変形しやすくなるとともに、当接部に当接しやすくなる。よって、前述の作用効果が安定して得られる。   In this case, since the cylindrical portion has a plurality of wall portions formed so as to be divided in the circumferential direction, when the pin member pushes the cylindrical portion outward in the radial direction, the cylindrical portion The part is more likely to be elastically deformed, and more easily contact the contact part. Therefore, the above-described operational effects can be obtained stably.

また、本発明のヘッド交換式切削工具において、前記押し拡げ部は、前記ピン部材の一端に形成されて前記ホルダに螺合するネジ部から他端へ向けて離間するに従い漸次前記径方向の外方へ向かって傾斜するテーパ面を有することとしてもよい。   Further, in the head replaceable cutting tool of the present invention, the expanding portion is gradually outward in the radial direction as it is separated from a screw portion formed at one end of the pin member and screwed into the holder toward the other end. It is good also as having a taper surface which inclines toward the direction.

この場合、ピン部材を筒部に挿入しやすくなり、かつ、該筒部がホルダの中心軸に対して傾斜させられるように弾性変形するから、この筒部と当接部とがより当接しやすくなる。   In this case, since it becomes easy to insert the pin member into the tube portion and the tube portion is elastically deformed so as to be inclined with respect to the central axis of the holder, the tube portion and the contact portion are more likely to contact each other. Become.

また、本発明のヘッド交換式切削工具において、前記切削ヘッドの前記中心軸方向を向く面、及び、この面に対向する前記ホルダの前記中心軸方向を向く面には、前記切削ヘッドと前記ホルダとの前記中心軸回りの相対回転を規制する回転規制部が形成されていることとしてもよい。   Further, in the head replaceable cutting tool of the present invention, the cutting head and the holder are provided on a surface facing the central axis direction of the cutting head and a surface facing the central axis direction of the holder facing the surface. And a rotation restricting portion that restricts relative rotation around the central axis.

この場合、前記中心軸方向に対向する切削ヘッドの面及びホルダの面に、これら切削ヘッドとホルダとの前記中心軸回りの相対回転を規制する回転規制部が形成されているので、前述した切削ヘッドの当接部とホルダの筒部との当接部分においては、前記相対回転を規制する構造等は必要ない。すなわち、前記相対回転を規制する部位と、芯合せする部位とを、互いに異なる箇所に配置できるため、それぞれの部位における各作用が安定して精度よく行われる。   In this case, since the rotation restricting portion for restricting the relative rotation of the cutting head and the holder around the central axis is formed on the surface of the cutting head and the surface of the holder facing the central axis direction, In the contact portion between the contact portion of the head and the cylindrical portion of the holder, the structure for restricting the relative rotation is not necessary. In other words, since the part that regulates the relative rotation and the part to be centered can be arranged at different places, each action at each part is stably and accurately performed.

本発明のヘッド交換式切削工具によれば、製造工程を複雑にすることなく、切削ヘッドとホルダとを精度よく簡単に芯合せできる。   According to the head exchangeable cutting tool of the present invention, the cutting head and the holder can be easily and accurately aligned without complicating the manufacturing process.

本発明の一実施形態に係るヘッド交換式切削工具を示す斜視図である。It is a perspective view showing a head exchange type cutting tool concerning one embodiment of the present invention. 図１のヘッド交換式切削工具の要部を示す部分側断面図である。It is a fragmentary sectional side view which shows the principal part of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具のホルダの先端形状を示す斜視図である。It is a perspective view which shows the front-end | tip shape of the holder of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具のホルダの先端形状を示す側面図である。It is a side view which shows the front-end | tip shape of the holder of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具のホルダの先端形状を示す正面図である。It is a front view which shows the front-end | tip shape of the holder of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具の切削ヘッドを示す斜視図である。It is a perspective view which shows the cutting head of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具の切削ヘッドを示す側面図である。It is a side view which shows the cutting head of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具の切削ヘッドを先端側から見た正面図である。It is the front view which looked at the cutting head of the head exchange type cutting tool of FIG. 1 from the front end side. 図１のヘッド交換式切削工具の切削ヘッドをホルダ側から見た背面図である。It is the rear view which looked at the cutting head of the head exchange type cutting tool of FIG. 1 from the holder side. 図１のヘッド交換式切削工具のピン部材を示す斜視図である。It is a perspective view which shows the pin member of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具のピン部材を先端側から見た正面図である。It is the front view which looked at the pin member of the head exchange type cutting tool of FIG. 1 from the front end side. 図１のヘッド交換式切削工具のピン部材を示す側面図である。It is a side view which shows the pin member of the head exchange type cutting tool of FIG. 図１のヘッド交換式切削工具において、ピン部材をホルダの筒部に挿入する際に行われるピン部材、ホルダ及び切削ヘッドの芯合せを説明する図である。In the head exchange type cutting tool of FIG. 1, it is a figure explaining the centering of a pin member, a holder, and a cutting head performed when inserting a pin member in the cylinder part of a holder.

以下、本発明の一実施形態に係るヘッド交換式切削工具１について、図１〜図１３を参照して説明する。
本実施形態のヘッド交換式切削工具１は、ヘッド交換式のエンドミルである。 Hereinafter, a head replaceable cutting tool 1 according to an embodiment of the present invention will be described with reference to FIGS.
The head replaceable cutting tool 1 of the present embodiment is a head replaceable end mill.

図１及び図２において、ヘッド交換式切削工具１は、切れ刃を有する切削ヘッド２と、切削ヘッド２が着脱可能に装着されるホルダ３と、ホルダ３に対して螺合により切削ヘッド２を固定するピン部材４と、を備えている。
ここで、ホルダ３は軸状をなし、切削ヘッド２は円筒状とされていて、切削ヘッド２は、ホルダ３の中心軸Ｃ１方向に沿う一端部に、該ホルダ３に同軸に配設されている。以下の説明においては、ホルダ３の中心軸Ｃ１方向に沿う切削ヘッド２側を先端側、切削ヘッド２とは反対側を基端側と言う。また、ホルダ３の中心軸Ｃ１に垂直な方向を径方向と言い、中心軸Ｃ１を中心に周回する方向を周方向と言う。 1 and 2, the head exchangeable cutting tool 1 includes a cutting head 2 having a cutting edge, a holder 3 to which the cutting head 2 is detachably mounted, and a cutting head 2 that is screwed into the holder 3. And a pin member 4 to be fixed.
Here, the holder 3 has an axial shape, and the cutting head 2 has a cylindrical shape. The cutting head 2 is disposed coaxially with the holder 3 at one end along the direction of the central axis C1 of the holder 3. Yes. In the following description, the cutting head 2 side along the central axis C1 direction of the holder 3 is referred to as the distal end side, and the side opposite to the cutting head 2 is referred to as the proximal end side. Further, a direction perpendicular to the central axis C1 of the holder 3 is referred to as a radial direction, and a direction around the central axis C1 is referred to as a circumferential direction.

このヘッド交換式切削工具１は、ホルダ３の基端側の端部（基端部）が工作機械の主軸に着脱可能に支持され、中心軸Ｃ１回りに回転させられることにより、切削ヘッド２の切れ刃で被削材を切削加工する、ヘッド交換式の転削工具である。   The head-exchangeable cutting tool 1 is configured such that the end portion (base end portion) on the base end side of the holder 3 is detachably supported by the main shaft of the machine tool and is rotated about the central axis C1 to This is a head-exchangeable turning tool that cuts a workpiece with a cutting edge.

ホルダ３は、鋼材により形成されており、中心軸Ｃ１に垂直な断面が円形状をなしている。尚、ホルダ３は、超硬合金からなる軸状のホルダ本体と、鋼材からなりホルダ本体の先端側の端部（先端部）にろう付けにより接合され、切削ヘッド２が装着される円柱状のホルダヘッド部と、を備えていてもよい。   The holder 3 is formed of a steel material, and a cross section perpendicular to the central axis C1 has a circular shape. The holder 3 is a cylindrical holder main body made of cemented carbide and a columnar cylindrical body on which the cutting head 2 is mounted by joining to an end portion (tip end portion) of the holder main body made of steel by brazing. A holder head portion.

図２において、ホルダ３の先端部３Ａは、それ以外の部分（本体部）３Ｂよりも小径に形成されている。また、ホルダ３の先端部３Ａには、その先端側を向く先端面３Ｃの径方向中央に開口するとともに、該先端面３Ｃから中心軸Ｃ１上を基端側へ向けて延びる雌ネジ穴３Ｄが穿設されている。雌ネジ穴３Ｄの内周面には、雌ネジ加工（不図示）が施されており、該雌ネジ穴３Ｄは、後述するピン部材４の雄ネジ部４Ａに螺合可能に形成されている。   In FIG. 2, the tip 3A of the holder 3 is formed to have a smaller diameter than the other part (main body part) 3B. The distal end portion 3A of the holder 3 has a female screw hole 3D that opens in the radial center of the distal end surface 3C facing the distal end side and extends from the distal end surface 3C toward the proximal end side on the central axis C1. It has been drilled. The inner peripheral surface of the female screw hole 3D is subjected to female screw processing (not shown), and the female screw hole 3D is formed so as to be able to be screwed into a male screw portion 4A of the pin member 4 described later. .

また、ホルダ３の先端面３Ｃには、先端部３Ａよりも小径とされて該先端面３Ｃから先端側へ向けて突出する筒状をなし、ホルダ３の中心軸Ｃ１に同軸とされ、該中心軸Ｃ１に垂直な径方向の外方に向けて弾性変形可能な筒部５が形成されている。筒部５の内径は、後述するピン部材４の雄ネジ部４Ａより僅かに大きく形成されている。筒部５の内周面における基端部（中心軸Ｃ１方向に沿う先端面３Ｃ部分に相当する部位）は、雌ネジ穴３Ｄの内周面における先端部（前記先端面３Ｃ部分に相当する開口縁部）に滑らかに連なっている。   Further, the tip surface 3C of the holder 3 has a cylindrical shape that is smaller in diameter than the tip portion 3A and protrudes from the tip surface 3C toward the tip side, and is coaxial with the center axis C1 of the holder 3, A cylindrical portion 5 is formed which is elastically deformable outward in the radial direction perpendicular to the axis C1. An inner diameter of the cylindrical portion 5 is formed slightly larger than a male screw portion 4A of the pin member 4 described later. The base end portion (the portion corresponding to the tip surface 3C portion along the direction of the central axis C1) on the inner peripheral surface of the cylindrical portion 5 is the tip portion (the opening corresponding to the tip surface 3C portion) on the inner peripheral surface of the female screw hole 3D. Edge).

図３〜図５に示されるように、筒部５は、ホルダ３の中心軸Ｃ１回りの周方向に沿って分割されるように形成された複数の壁部５Ａを有している。これら壁部５Ａは、中心軸Ｃ１を中心として互いに周方向に間隔をあけて配置され、それぞれの壁部５Ａは、中心軸Ｃ１に垂直な断面が円弧状をなしている。このように、複数の壁部５Ａが中心軸Ｃ１回りに周方向に配列されることにより、筒部５は全体として円筒状をなしている。   As shown in FIGS. 3 to 5, the cylindrical portion 5 has a plurality of wall portions 5 </ b> A formed so as to be divided along the circumferential direction around the central axis C <b> 1 of the holder 3. These wall portions 5A are arranged at intervals in the circumferential direction around the central axis C1, and each wall portion 5A has an arcuate cross section perpendicular to the central axis C1. As described above, the plurality of wall portions 5A are arranged in the circumferential direction around the central axis C1, so that the tubular portion 5 has a cylindrical shape as a whole.

壁部５Ａの外周面における基端部には、周方向に沿って延びる凹溝５Ｂが形成されている。このような凹溝５Ｂが形成されることにより、壁部５Ａはその基端部が薄肉となっている。   A concave groove 5B extending along the circumferential direction is formed at the base end portion of the outer peripheral surface of the wall portion 5A. By forming such a concave groove 5B, the base portion of the wall 5A is thin.

また、筒部５において径方向の内方を向く面、つまり壁部５Ａの内周面には、中心軸Ｃ１に沿ってホルダ３の先端側へ向かうに従い漸次径方向の外方へ向かって傾斜する傾斜面５Ｃが形成されている。傾斜面５Ｃは、壁部５Ａ（筒部５）の内周面における先端部に形成されている。   Further, the surface of the cylindrical portion 5 facing inward in the radial direction, that is, the inner peripheral surface of the wall portion 5A is gradually inclined outward in the radial direction along the central axis C1 toward the tip side of the holder 3. An inclined surface 5C is formed. The inclined surface 5C is formed at the tip of the inner peripheral surface of the wall 5A (tubular portion 5).

また、ホルダ３の先端面３Ｃには、基端側へ向けて窪む凹部６と、先端側へ向けて突出する凸部７と、が複数形成されているとともに、これらが中心軸Ｃ１を中心として周方向に交互に配列されている。   The front end surface 3C of the holder 3 is formed with a plurality of concave portions 6 that are recessed toward the proximal end side and convex portions 7 that protrude toward the distal end side, and these are centered on the central axis C1. Are alternately arranged in the circumferential direction.

図３及び図５に示されるように、凹部６は扇形状をなす穴であり、凸部７は扇形状をなす突起である。これら凹部６と凸部７とが周方向に隣接して連続的に並べられることにより、先端面３Ｃは凹凸形状とされている。
また、凹部６における径方向の内方の端部は、雌ネジ穴３Ｄの開口縁部に連なっている。凸部７における径方向の内方の端部には、壁部５Ａが立設されている。 As shown in FIGS. 3 and 5, the concave portion 6 is a fan-shaped hole, and the convex portion 7 is a fan-shaped projection. 3 C of front-end | tip surfaces are made into the uneven | corrugated shape by arranging these recessed part 6 and the convex part 7 adjacent to the circumferential direction continuously.
The radially inner end of the recess 6 is continuous with the opening edge of the female screw hole 3D. A wall portion 5 </ b> A is erected at the radially inner end of the convex portion 7.

図２、図６〜図９において、切削ヘッド２は、超硬合金により形成されており、その中心軸Ｃ２方向の先端側を向く先端面２Ａ、及び、該先端面２Ａに隣接し中心軸Ｃ２に垂直な径方向の外方を向く外周面２Ｂに、複数の切れ刃（不図示）を有している。切削ヘッド２の外径は、ホルダ３の先端部３Ａの外径より若干大きくなっている（図２を参照）。
ここで、切削ヘッド２の前記中心軸Ｃ２は、該切削ヘッド２がホルダ３に装着された状態において中心軸Ｃ１に同軸であるから、ヘッド交換式切削工具１におけるこれら中心軸Ｃ１、Ｃ２は、互いに共通軸である。 2 and 6 to 9, the cutting head 2 is made of cemented carbide, and has a tip surface 2A facing the tip side in the direction of the center axis C2, and a center axis C2 adjacent to the tip surface 2A. A plurality of cutting edges (not shown) are provided on the outer peripheral surface 2B facing radially outward in the direction perpendicular to the radial direction. The outer diameter of the cutting head 2 is slightly larger than the outer diameter of the tip 3A of the holder 3 (see FIG. 2).
Here, since the central axis C2 of the cutting head 2 is coaxial with the central axis C1 in a state where the cutting head 2 is mounted on the holder 3, the central axes C1 and C2 in the head replaceable cutting tool 1 are They are common axes.

切削ヘッド２には、中心軸Ｃ２上に沿って延びるとともに、該切削ヘッド２を貫通する多段状の取付孔８が形成されている。図７において、取付孔８の内周面は、その中心軸Ｃ２方向に沿う中央部８Ａが最も小径とされており、該中央部８Ａの先端側（図７における上側）に位置する先端部８Ｂの内径、及び、該中央部８Ａの基端側（図７における下側）に位置する基端部（当接部）８Ｃの内径が互いに略同一とされているとともに、中央部８Ａの内径より大径となっている。   The cutting head 2 is formed with multi-stage mounting holes 8 extending along the central axis C <b> 2 and penetrating the cutting head 2. In FIG. 7, the inner peripheral surface of the mounting hole 8 has a central portion 8A having the smallest diameter along the direction of the central axis C2, and a distal end portion 8B located on the distal end side (the upper side in FIG. 7) of the central portion 8A. And the inner diameter of the base end portion (contact portion) 8C located on the base end side (lower side in FIG. 7) of the central portion 8A are substantially the same as each other, and from the inner diameter of the central portion 8A Large diameter.

図２に示されるように、切削ヘッド２がホルダ３先端に装着された状態で、取付孔８の内周面のうち基端部８Ｃは、筒部５の径方向の外方に配置される。基端部８Ｃは、筒部５に対応する円柱穴状をなしている。また、基端部８Ｃの内径は、筒部５の外径より僅かに大きくなっている。そして、切削ヘッド２の基端部８Ｃには、後述するピン部材４が筒部５に挿入された際、この筒部５が径方向の外方に向けて弾性変形することによって、該筒部５が当接可能とされている。つまり、取付孔８の内周面における基端部８Ｃは、筒部５の外周面が当接可能とされた当接部である。   As shown in FIG. 2, the base end portion 8 </ b> C of the inner peripheral surface of the mounting hole 8 is disposed outward in the radial direction of the cylindrical portion 5 in a state where the cutting head 2 is attached to the tip of the holder 3. . The base end portion 8 </ b> C has a cylindrical hole shape corresponding to the cylindrical portion 5. Further, the inner diameter of the base end portion 8 </ b> C is slightly larger than the outer diameter of the cylindrical portion 5. And when the pin member 4 mentioned later is inserted in the cylindrical part 5 at the base end part 8C of the cutting head 2, this cylindrical part 5 is elastically deformed outward in the radial direction. 5 can be contacted. That is, the base end portion 8 </ b> C on the inner peripheral surface of the mounting hole 8 is an abutting portion on which the outer peripheral surface of the cylindrical portion 5 can abut.

また、取付孔８の内周面における中央部８Ａのうち、先端側に位置する部分は、中心軸Ｃ２方向に沿って先端側へ向かうに従い漸次径方向の外方に向かって傾斜する傾斜面８Ｄとなっている。また、取付孔８には、中心軸Ｃ２方向の基端側を向くとともに、中央部８Ａの基端側の周端縁と基端部８Ｃの先端側の周端縁とを繋ぐように、環状面８Ｅが形成されている。図２に示されるように、切削ヘッド２がホルダ３先端に装着された状態で、環状面８Ｅと筒部５の先端側を向く面との間には、若干の隙間が形成される。   In addition, a portion of the central portion 8A on the inner peripheral surface of the mounting hole 8 that is located on the distal end side is an inclined surface 8D that gradually inclines outward in the radial direction along the central axis C2 direction toward the distal end side. It has become. Further, the mounting hole 8 has a ring shape so as to face the base end side in the direction of the central axis C2 and to connect the peripheral end edge on the base end side of the central portion 8A and the peripheral end edge on the front end side of the base end portion 8C. A surface 8E is formed. As shown in FIG. 2, a slight gap is formed between the annular surface 8 </ b> E and the surface facing the distal end side of the cylindrical portion 5 in a state where the cutting head 2 is attached to the distal end of the holder 3.

また、切削ヘッド２の基端側を向く面２Ｃには、先端側へ向けて窪む凹部９と、基端側へ向けて突出する凸部１０と、が複数形成されているとともに、これらが中心軸Ｃ２を中心として周方向に交互に配列されている。   The surface 2C facing the base end side of the cutting head 2 is formed with a plurality of concave portions 9 that are recessed toward the distal end side and convex portions 10 that protrude toward the base end side. They are alternately arranged in the circumferential direction around the central axis C2.

図６及び図９に示されるように、凹部９は扇形状をなす穴であり、凸部１０は扇形状をなす突起である。これら凹部９と凸部１０とが周方向に隣接して連続的に並べられることにより、面２Ｃは凹凸形状とされている。   As shown in FIGS. 6 and 9, the concave portion 9 is a fan-shaped hole, and the convex portion 10 is a fan-shaped projection. The concave portion 9 and the convex portion 10 are continuously arranged adjacent to each other in the circumferential direction, so that the surface 2C has an uneven shape.

図１及び図２において、切削ヘッド２がホルダ３先端に装着された状態で、切削ヘッド２の基端側を向く面２Ｃに形成された凹部９と、ホルダ３の先端面３Ｃに形成された凸部７とは、互いに当接する。また、切削ヘッド２の基端側を向く面２Ｃに形成された凸部１０と、ホルダ３の先端面３Ｃに形成された凹部６とは、互いに当接する。これにより、凹部９と凸部７とが係合し、凸部１０と凹部６とが係合する。   In FIG. 1 and FIG. 2, the concave portion 9 formed on the surface 2 </ b> C facing the proximal end side of the cutting head 2 and the distal end surface 3 </ b> C of the holder 3 with the cutting head 2 attached to the distal end of the holder 3. The convex portions 7 are in contact with each other. Further, the convex portion 10 formed on the surface 2 </ b> C facing the base end side of the cutting head 2 and the concave portion 6 formed on the distal end surface 3 </ b> C of the holder 3 are in contact with each other. Thereby, the recessed part 9 and the convex part 7 engage, and the convex part 10 and the recessed part 6 engage.

このヘッド交換式切削工具１は、前述のように凹部６、９及び凸部７、１０が係合することによって、切削ヘッド２とホルダ３との中心軸Ｃ１、Ｃ２回りの相対回転が規制されている。このように、切削ヘッド２の中心軸Ｃ２方向を向く面２Ｃ、及び、この面２Ｃに対向するホルダ３の中心軸Ｃ１方向を向く面（先端面）３Ｃには、互いに係合する凹部６、９及び凸部７、１０を備えた回転規制部１１が形成されている。   In the head exchange type cutting tool 1, the relative rotation around the central axes C <b> 1 and C <b> 2 between the cutting head 2 and the holder 3 is restricted by engaging the concave portions 6 and 9 and the convex portions 7 and 10 as described above. ing. In this way, the surface 2C facing the central axis C2 direction of the cutting head 2 and the surface (front end surface) 3C facing the central axis C1 direction of the holder 3 facing the surface 2C are recessed portions 6 that engage with each other, 9 and a rotation restricting portion 11 having convex portions 7 and 10 are formed.

ピン部材４は、鋼材により形成されている。図２、図１０〜図１２に示されるように、ピン部材４は、その中心軸Ｃ３方向に沿う基端部（ここで言う基端部とは、ホルダ３に装着されたピン部材４における該ホルダ３基端側の端部を差し、ピン部材４における一端である）に位置して雄ネジ加工（不図示）が施されるとともに、雌ネジ穴３Ｄに螺合するように形成され、最も小径とされた雄ネジ部（ネジ部）４Ａと、中心軸Ｃ３方向に沿う先端部（ここで言う先端部とは、ホルダ３に装着されたピン部材４における該ホルダ３先端側の端部を差し、ピン部材４における他端である）に位置して最も大径とされた頭部４Ｂと、雄ネジ部４Ａ及び頭部４Ｂの中間に位置して円柱状をなし、切削ヘッド２がホルダ３に装着された状態において、筒部５に径方向の内方から当接して該筒部５を径方向の外方へ向けて弾性変形させる押し拡げ部４Ｃと、を備えている。
ここで、ピン部材４の前記中心軸Ｃ３は、該ピン部材４がホルダ３の筒部５に挿入され雄ネジ部４Ａが雌ネジ穴３Ｄに螺合された状態において、中心軸Ｃ１に同軸であるから、ヘッド交換式切削工具１におけるこれら中心軸Ｃ１、Ｃ３は、互いに共通軸である。また、前述のように中心軸Ｃ１、Ｃ２は共通軸であるから、これら中心軸Ｃ１、Ｃ２、Ｃ３は、共通軸（同軸）である。 The pin member 4 is formed of a steel material. As shown in FIGS. 2 and 10 to 12, the pin member 4 has a base end portion along the direction of the central axis C <b> 3 (the base end portion here is the pin member 4 attached to the holder 3. The end of the holder 3 on the base end side is inserted and is located at one end of the pin member 4) and is subjected to male screw processing (not shown) and is formed to be screwed into the female screw hole 3D. A small-diameter male screw portion (screw portion) 4A and a tip portion along the direction of the central axis C3 (here, the tip portion refers to the end portion on the tip side of the holder 3 of the pin member 4 attached to the holder 3). And the other end of the pin member 4), the head 4B having the largest diameter, and a cylindrical shape located between the male screw 4A and the head 4B. The cutting head 2 is a holder. 3, the cylindrical portion 5 is brought into contact with the cylindrical portion 5 from the inside in the radial direction so that the cylindrical portion 5 Toward the outside of direction includes a the spreading portion 4C to elastically deform, the.
Here, the central axis C3 of the pin member 4 is coaxial with the central axis C1 in a state where the pin member 4 is inserted into the cylindrical portion 5 of the holder 3 and the male screw portion 4A is screwed into the female screw hole 3D. Therefore, the central axes C1 and C3 in the head exchangeable cutting tool 1 are common axes. Since the central axes C1 and C2 are common axes as described above, the central axes C1, C2 and C3 are common axes (coaxial).

ピン部材４の頭部４Ｂのうち、基端側（図１２における下側、ピン部材４の一端に位置する雄ネジ部４Ａ側）に位置する部分は、中心軸Ｃ３方向に沿って基端側へ向かうに従い漸次径方向の内方に向かって傾斜する傾斜面４Ｄとなっている。傾斜面４Ｄにおける中心軸Ｃ３方向に沿う単位長さあたりの径方向への変位量（つまり傾き）は、切削ヘッド２の傾斜面８Ｄにおける中心軸Ｃ２方向に沿う単位長さあたりの径方向への変位量と略同一とされており、これにより傾斜面４Ｄと傾斜面８Ｄとは互いに広範囲に面接触しやすくなっている。   Of the head portion 4B of the pin member 4, the portion located on the base end side (the lower side in FIG. 12, the male screw portion 4A side positioned at one end of the pin member 4) is the base end side along the direction of the central axis C3. It becomes the inclined surface 4D which inclines toward the inner side of radial direction gradually as it goes to. The amount of displacement (that is, the inclination) in the radial direction per unit length along the central axis C3 direction on the inclined surface 4D is the radial displacement per unit length along the central axis C2 direction on the inclined surface 8D of the cutting head 2. The amount of displacement is substantially the same, so that the inclined surface 4D and the inclined surface 8D are easily in surface contact with each other over a wide range.

また、ピン部材４の押し拡げ部４Ｃのうち、基端側に位置する部分は、中心軸Ｃ３方向に沿って基端側へ向かうに従い漸次径方向の内方に向かって傾斜するテーパ面４Ｅとなっている。すなわち、このテーパ面４Ｅは、ピン部材４の一端に位置する雄ネジ部４Ａから他端に位置する頭部４Ｂへ向けて離間するに従い漸次径方向の外方へ向かって傾斜して形成されている。   Further, the portion located on the base end side of the expanded portion 4C of the pin member 4 has a tapered surface 4E that gradually inclines inward in the radial direction along the direction of the central axis C3 toward the base end side. It has become. That is, the taper surface 4E is formed so as to be gradually inclined outward in the radial direction as it is separated from the male screw portion 4A located at one end of the pin member 4 toward the head portion 4B located at the other end. Yes.

次に、このように構成された本実施形態のヘッド交換式切削工具１の作用（芯合せ）について、図１３を用いて説明する。
図１３（ａ）において、切削ヘッド２をホルダ３の先端部に載せると、切削ヘッド２の取付孔８の基端部８Ｃに、ホルダ３の筒部５が挿入される。また、切削ヘッド２の基端側を向く面２Ｃとホルダ３の先端面３Ｃとが当接するとともに、対応する凹部６、９と凸部７、１０とが噛み合うように係合する。
この状態から、切削ヘッド２の取付孔８を通して、ピン部材４をホルダ３の筒部５に挿入していく。ここで、図中の矢印は、ホルダ３に対するピン部材４の押し込み（ねじ込み）方向を示している。図１３（ａ）に示される状態においては、ホルダ３の中心軸Ｃ１、切削ヘッド２の中心軸Ｃ２及びピン部材４の中心軸Ｃ３は、互いに異なる位置にある。 Next, the operation (centering) of the head exchangeable cutting tool 1 of the present embodiment configured as described above will be described with reference to FIG.
In FIG. 13A, when the cutting head 2 is placed on the distal end portion of the holder 3, the cylindrical portion 5 of the holder 3 is inserted into the proximal end portion 8 </ b> C of the mounting hole 8 of the cutting head 2. Further, the surface 2C facing the base end side of the cutting head 2 and the distal end surface 3C of the holder 3 are in contact with each other, and the corresponding concave portions 6 and 9 and the convex portions 7 and 10 are engaged with each other.
From this state, the pin member 4 is inserted into the cylindrical portion 5 of the holder 3 through the mounting hole 8 of the cutting head 2. Here, the arrow in the figure indicates the direction in which the pin member 4 is pushed (screwed) into the holder 3. In the state shown in FIG. 13A, the central axis C1 of the holder 3, the central axis C2 of the cutting head 2, and the central axis C3 of the pin member 4 are at different positions.

次いで、図１３（ｂ）において、ピン部材４の雄ネジ部４Ａがホルダ３の雌ネジ穴３Ｄ（図１３には不図示）に螺合され、ねじ込まれていく。これにより、ホルダ３に対してピン部材４が基端側へ向かい矢印方向に進入していき、筒部５内に挿入されていく。この際、ピン部材４の押し拡げ部４Ｃが、筒部５に径方向の内方から当接するとともに、該筒部５を径方向の外方へ向けて弾性変形させ、押し拡げる。ピン部材４は、その中心軸Ｃ３をホルダ３の中心軸Ｃ１に一致させるように径方向に移動して、ピン部材４の中心軸Ｃ３とホルダ３の中心軸Ｃ１とが同軸に位置決めされる。   Next, in FIG. 13B, the male screw portion 4A of the pin member 4 is screwed into and screwed into the female screw hole 3D (not shown in FIG. 13) of the holder 3. As a result, the pin member 4 enters the base 3 toward the proximal end side with respect to the holder 3 and is inserted into the cylindrical portion 5. At this time, the expanded portion 4C of the pin member 4 abuts on the cylindrical portion 5 from the inside in the radial direction, and elastically deforms the cylindrical portion 5 toward the outside in the radial direction to expand the cylindrical portion 5. The pin member 4 moves in the radial direction so that its central axis C3 coincides with the central axis C1 of the holder 3, so that the central axis C3 of the pin member 4 and the central axis C1 of the holder 3 are positioned coaxially.

具体的には、押し拡げ部４Ｃの外周面が筒部５の各壁部５Ａの内周面に接触する面積は、周方向に均等となるように配分されているとともに、ピン部材４の基端側へ向けた単位長さあたりの移動量に対する各壁部５Ａの径方向外方へ向けた変位量（筒部５の拡径量）が周方向に均等となるように、ピン部材４が径方向に移動させられて、中心軸Ｃ１、Ｃ３が一致させられている。図１３（ｂ）に示される状態においては、このようにホルダ３の中心軸Ｃ１とピン部材４の中心軸Ｃ３とが同軸とされている一方、切削ヘッド２の中心軸Ｃ２はこれら中心軸Ｃ１、Ｃ３とは異なる位置にある。   Specifically, the area where the outer peripheral surface of the expanded portion 4 </ b> C contacts the inner peripheral surface of each wall portion 5 </ b> A of the cylindrical portion 5 is distributed so as to be even in the circumferential direction, and the base of the pin member 4. The pin member 4 is arranged so that the amount of displacement of each wall portion 5A toward the outer side in the radial direction with respect to the amount of movement per unit length toward the end side (the amount of diameter expansion of the cylindrical portion 5) is uniform in the circumferential direction. The central axes C1 and C3 are made to coincide with each other by being moved in the radial direction. In the state shown in FIG. 13B, the central axis C1 of the holder 3 and the central axis C3 of the pin member 4 are thus coaxial, whereas the central axis C2 of the cutting head 2 is the central axis C1. , C3 is in a different position.

次いで、図１３（ｃ）において、ホルダ３に対してピン部材４がさらにねじ込まれていくと、筒部５もさらに弾性変形し径方向の外方に向けて押し拡げられていく。そして、筒部５は、その径方向の外方に位置する切削ヘッド２の当接部（取付孔８の基端部８Ｃ）に当接する。この当接によって、切削ヘッド２は、その中心軸Ｃ２をホルダ３の中心軸Ｃ１に一致させるように径方向に移動して、切削ヘッド２の中心軸Ｃ２とホルダ３の中心軸Ｃ１とが同軸に位置決めされる。   Next, in FIG. 13C, when the pin member 4 is further screwed into the holder 3, the cylindrical portion 5 is further elastically deformed and is expanded outward in the radial direction. And the cylinder part 5 contact | abuts to the contact part (base-end part 8C of the attachment hole 8) of the cutting head 2 located in the radial direction outer side. By this contact, the cutting head 2 moves in the radial direction so that the central axis C2 thereof coincides with the central axis C1 of the holder 3, and the central axis C2 of the cutting head 2 and the central axis C1 of the holder 3 are coaxial. Is positioned.

具体的には、筒部５の外周面のうち、基端部８Ｃに比較的接近した部分から基端部８Ｃに当接され、さらに筒部５が拡径されることによって切削ヘッド２は径方向に移動させられる。これにより、筒部５の外周面において前記部分とは周方向の反対側に位置する部分に対して基端部８Ｃが接近させられて、当接する。このような作用が筒部５の外周面の周方向各部でなされることにより、筒部５の外周面が基端部８Ｃの内周面に周方向に均等に当接するとともに、切削ヘッド２の中心軸Ｃ２がホルダ３の中心軸Ｃ１に一致させられている。そして、図１３（ｃ）に示される状態においては、ホルダ３の中心軸Ｃ１、切削ヘッド２の中心軸Ｃ２及びピン部材４の中心軸Ｃ３が一致して、互いに同軸とされている。   Specifically, of the outer peripheral surface of the cylindrical portion 5, the cutting head 2 is brought into contact with the proximal end portion 8 </ b> C from a portion relatively close to the proximal end portion 8 </ b> C, and further the diameter of the cylindrical portion 5 is increased so that the cutting head 2 Moved in the direction. Accordingly, the base end portion 8C is brought close to and comes into contact with a portion located on the outer circumferential surface of the cylindrical portion 5 on the opposite side of the circumferential direction from the portion. Such an action is performed at each part in the circumferential direction of the outer peripheral surface of the cylindrical part 5, so that the outer peripheral surface of the cylindrical part 5 uniformly contacts the inner peripheral surface of the base end part 8 </ b> C in the circumferential direction and the cutting head 2. The central axis C2 is made to coincide with the central axis C1 of the holder 3. In the state shown in FIG. 13C, the central axis C1 of the holder 3, the central axis C2 of the cutting head 2, and the central axis C3 of the pin member 4 are coincident with each other and are coaxial.

図２に示されるように、ホルダ３に対してピン部材４が所定量ねじ込まれることにより、該ピン部材４の傾斜面４Ｄと切削ヘッド２の傾斜面８Ｄとが当接する。これにより、切削ヘッド２がホルダ３にクランプされる。
一方、切削加工に供された切削ヘッド２を別の新しい切削ヘッド２に交換する際は、前述の手順と逆の手順によって、ピン部材４をホルダ３から取り外す。これにより、筒部５は復元変形するとともに、切削ヘッド２の取付孔８の基端部８Ｃから離間される。 As shown in FIG. 2, when the pin member 4 is screwed into the holder 3 by a predetermined amount, the inclined surface 4D of the pin member 4 and the inclined surface 8D of the cutting head 2 come into contact with each other. Thereby, the cutting head 2 is clamped to the holder 3.
On the other hand, when the cutting head 2 subjected to the cutting process is replaced with another new cutting head 2, the pin member 4 is removed from the holder 3 by a procedure reverse to the above-described procedure. Thereby, the cylindrical portion 5 is restored and deformed, and is separated from the base end portion 8 </ b> C of the mounting hole 8 of the cutting head 2.

以上説明したように、本実施形態のヘッド交換式切削工具１によれば、ホルダ３の筒部５を弾性変形させ、切削ヘッド２の当接部（基端部８Ｃ）に当接させることによって、ホルダ３と切削ヘッド２との芯合せ（芯出し）が行われることから、従来の嵌合による芯合せとは異なり、このヘッド交換式切削工具１では、筒部５、当接部及び押し拡げ部４Ｃに対して高精度な研磨加工は不要である。具体的に、このヘッド交換式切削工具１によれば、筒部５、当接部及び押し拡げ部４Ｃに対してラフな研磨加工のみ、或いは研磨レスとすることができる。特に、硬質の超硬合金からなる切削ヘッド２に対して研磨が不要であり、焼結後の状態をそのまま切削加工に用いることができる点で優れている。   As described above, according to the head-exchangeable cutting tool 1 of the present embodiment, the cylindrical portion 5 of the holder 3 is elastically deformed and brought into contact with the contact portion (base end portion 8C) of the cutting head 2. Since the centering (centering) of the holder 3 and the cutting head 2 is performed, the head-exchangeable cutting tool 1 is different from the centering by the conventional fitting in the cylinder part 5, the abutting part and the pushing part. High-precision polishing is not required for the expanded portion 4C. Specifically, according to the head-exchangeable cutting tool 1, only rough polishing or no polishing can be performed with respect to the cylindrical portion 5, the contact portion, and the expanded portion 4C. In particular, the cutting head 2 made of a hard cemented carbide is excellent in that polishing is unnecessary and the state after sintering can be used as it is for cutting.

このように、本実施形態によれば、製造工程を複雑にすることなく、切削ヘッド２とホルダ３とを精度よく簡単に芯合せすることができるのである。   Thus, according to the present embodiment, the cutting head 2 and the holder 3 can be accurately and easily aligned without complicating the manufacturing process.

また、筒部５が周方向に分割されるように形成された複数の壁部５Ａを有しているので、ピン部材４が該筒部５を径方向の外方に向けて押し拡げる際に、筒部５がより弾性変形しやすくなるとともに、当接部に当接しやすくなる。よって、前述の作用効果が安定して得られる。   Moreover, since it has the some wall part 5A formed so that the cylinder part 5 might be divided | segmented into the circumferential direction, when the pin member 4 pushes this cylinder part 5 outward toward a radial direction, it expands. The cylindrical portion 5 is more easily elastically deformed, and is more likely to come into contact with the contact portion. Therefore, the above-described operational effects can be obtained stably.

また、押し拡げ部４Ｃにテーパ面４Ｅが形成されているので、ピン部材４を筒部５に挿入しやすくなり、かつ、該筒部５の壁部５Ａがホルダ３の中心軸Ｃ１に対して傾斜させられるように弾性変形するから、壁部５Ａの先端部が当接部に当接しやすくなる。よって、筒部５と当接部との当接が確実に行われる。   Further, since the taper surface 4E is formed on the expanded portion 4C, the pin member 4 can be easily inserted into the cylindrical portion 5 and the wall portion 5A of the cylindrical portion 5 is located with respect to the central axis C1 of the holder 3. Since it is elastically deformed so as to be inclined, the tip of the wall portion 5A can easily come into contact with the contact portion. Therefore, the contact between the cylindrical portion 5 and the contact portion is reliably performed.

また、筒部５の内周面に傾斜面５Ｃが形成されていることから、ピン部材４が筒部５内に確実に案内されて、該ピン部材４をホルダ３に螺合させやすい。   In addition, since the inclined surface 5C is formed on the inner peripheral surface of the cylindrical portion 5, the pin member 4 is reliably guided into the cylindrical portion 5, and the pin member 4 is easily screwed into the holder 3.

また、中心軸Ｃ１方向に対向する切削ヘッド２の面２Ｃ及びホルダ３の先端面３Ｃに、これら切削ヘッド２とホルダ３との中心軸Ｃ１回りの相対回転を規制する回転規制部１１が形成されているので、前述した切削ヘッド２の当接部（基端部８Ｃ）とホルダ３の筒部５との当接部分においては、前記相対回転を規制する構造等は必要ない。すなわち、前記相対回転を規制する部位と、芯合せする部位とを、互いに異なる箇所に配置できるため、それぞれの部位における各作用が安定して精度よく行われる。   Further, on the surface 2C of the cutting head 2 and the front end surface 3C of the holder 3 facing in the direction of the central axis C1, a rotation restricting portion 11 that restricts the relative rotation of the cutting head 2 and the holder 3 around the central axis C1 is formed. Therefore, in the contact portion between the contact portion (base end portion 8C) of the cutting head 2 and the cylindrical portion 5 of the holder 3, the structure for restricting the relative rotation is not necessary. In other words, since the part that regulates the relative rotation and the part to be centered can be arranged at different places, each action at each part is stably and accurately performed.

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できる。   In addition, this invention is not limited to the above-mentioned embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

例えば、前述した実施形態では、筒部５が全体として円筒状をなし、切削ヘッド２の当接部（基端部８Ｃ）がこれに対応する円柱穴状をなしているとしたが、これに限定されるものではない。すなわち、筒部５が、断面非円形の例えば多角形筒状又は楕円筒状をなし、切削ヘッド２の当接部が前記筒部５の形状に対応する断面非円形の例えば多角形柱穴状又は楕円柱穴状をなしていても構わない。
この場合、筒部５及び当接部は、前述した芯合せ効果を奏するほか、切削ヘッド２とホルダ３との相対回転を規制する効果をも奏する。 For example, in the above-described embodiment, the cylindrical portion 5 has a cylindrical shape as a whole, and the contact portion (base end portion 8C) of the cutting head 2 has a corresponding cylindrical hole shape. It is not limited. That is, the cylindrical part 5 has, for example, a polygonal cylindrical shape or an elliptical cylindrical shape having a non-circular cross section, and the abutting part of the cutting head 2 has a non-circular cross section corresponding to the shape of the cylindrical part 5, for example, Alternatively, it may have an elliptical column shape.
In this case, the cylindrical part 5 and the contact part have the effect of regulating the relative rotation between the cutting head 2 and the holder 3 in addition to the above-described centering effect.

また、前述の実施形態では、ヘッド交換式切削工具１は、ヘッド交換式のエンドミルであるとしたが、これに限定されるものではなく、例えば、それ以外のヘッド交換式のねじ切り工具（タップ）等であっても構わない。
また、切削ヘッド２の切れ刃が、先端面２Ａ及び外周面２Ｂに形成されているとしたが、切れ刃は、先端面２Ａ又は外周面２Ｂに形成されていても構わない。 In the above-described embodiment, the head replaceable cutting tool 1 is a head replaceable end mill. However, the present invention is not limited to this. For example, other head replaceable thread cutting tools (tap) are used. And so on.
In addition, although the cutting edge of the cutting head 2 is formed on the front end surface 2A and the outer peripheral surface 2B, the cutting edge may be formed on the front end surface 2A or the outer peripheral surface 2B.

１ ヘッド交換式切削工具
２ 切削ヘッド
２Ｃ 切削ヘッドの基端側を向く面（切削ヘッドの中心軸方向を向く面）
３ ホルダ
３Ｃ ホルダの先端面（ホルダの中心軸方向を向く面）
４ ピン部材
４Ａ 雄ネジ部（ネジ部）
４Ｃ 押し拡げ部
４Ｅ テーパ面
５ 筒部
５Ａ 壁部
８Ｃ 取付孔の基端部（当接部）
１１ 回転規制部
Ｃ１ ホルダの中心軸 DESCRIPTION OF SYMBOLS 1 Head exchange type cutting tool 2 Cutting head 2C The surface which faces the base end side of a cutting head (surface which faces the center axis direction of a cutting head)
3 Holder 3C Holder end surface (surface facing the center axis direction of the holder)
4 Pin member 4A Male screw part (screw part)
4C Expanding part 4E Tapered surface 5 Tube part 5A Wall part 8C Base end part (contact part) of mounting hole
11 Rotation restriction part C1 Center axis of holder

Claims (4)

切れ刃を有する切削ヘッドと、
前記切削ヘッドが着脱可能に装着されるホルダと、
前記ホルダに対して螺合により前記切削ヘッドを固定するピン部材と、を備えたヘッド交換式切削工具であって、
前記ホルダは、該ホルダの中心軸に同軸とされ、該中心軸に垂直な径方向の外方に向けて弾性変形可能な筒部を有し、
前記切削ヘッドは、前記筒部の前記径方向の外方に配置され該筒部が当接可能な当接部を有し、
前記ピン部材は、前記筒部に前記径方向の内方から当接して該筒部を前記径方向の外方へ向けて弾性変形させる押し拡げ部を有することを特徴とするヘッド交換式切削工具。 A cutting head having a cutting edge;
A holder to which the cutting head is detachably mounted;
A pin member for fixing the cutting head by screwing to the holder, and a head replaceable cutting tool comprising:
The holder has a cylindrical portion that is coaxial with the central axis of the holder and is elastically deformable outward in the radial direction perpendicular to the central axis.
The cutting head has an abutting portion that is disposed on the outer side of the cylindrical portion in the radial direction and on which the cylindrical portion can abut,
The head-replaceable cutting tool, wherein the pin member has a push-out portion that abuts the cylindrical portion from the inside in the radial direction and elastically deforms the cylindrical portion toward the outside in the radial direction. . 請求項１に記載のヘッド交換式切削工具であって、
前記筒部は、前記ホルダの中心軸回りの周方向に沿って分割されるように形成された複数の壁部を有することを特徴とするヘッド交換式切削工具。 The head replaceable cutting tool according to claim 1,
The cylinder part has a plurality of wall parts formed so that it may be divided along the peripheral direction around the central axis of the holder, The head exchange type cutting tool characterized by things. 請求項１又は２に記載のヘッド交換式切削工具であって、
前記押し拡げ部は、前記ピン部材の一端に形成されて前記ホルダに螺合するネジ部から他端へ向けて離間するに従い漸次前記径方向の外方へ向かって傾斜するテーパ面を有することを特徴とするヘッド交換式切削工具。 The head replaceable cutting tool according to claim 1 or 2,
The said expansion part has a taper surface which inclines toward the outward of the said radial direction gradually as it separates toward the other end from the thread part which is formed in the end of the said pin member, and is screwed together in the said holder. Features a head-changing cutting tool. 請求項１〜３のいずれか一項に記載のヘッド交換式切削工具であって、
前記切削ヘッドの前記中心軸方向を向く面、及び、この面に対向する前記ホルダの前記中心軸方向を向く面には、前記切削ヘッドと前記ホルダとの前記中心軸回りの相対回転を規制する回転規制部が形成されていることを特徴とするヘッド交換式切削工具。 It is a head exchange type cutting tool as described in any one of Claims 1-3,
Relative rotation of the cutting head and the holder around the central axis is restricted on a surface facing the central axis direction of the cutting head and a surface facing the central axis direction of the holder facing the surface. A head exchangeable cutting tool, wherein a rotation restricting portion is formed.
JP2011045015A 2011-03-02 2011-03-02 Head exchange type cutting tool Withdrawn JP2012179685A (en)

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