JP2020114617A - Tip replaceable cutting tool - Google Patents
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- JP2020114617A JP2020114617A JP2019204605A JP2019204605A JP2020114617A JP 2020114617 A JP2020114617 A JP 2020114617A JP 2019204605 A JP2019204605 A JP 2019204605A JP 2019204605 A JP2019204605 A JP 2019204605A JP 2020114617 A JP2020114617 A JP 2020114617A
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- 230000002093 peripheral effect Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 235000013290 Sagittaria latifolia Nutrition 0.000 description 1
- 235000015246 common arrowhead Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
Description
本発明は刃先交換式切削工具に関し、特にねじ加工用の切削インサートを用いる刃先交換式転削工具に関する。 The present invention relates to a replaceable cutting tool, and more particularly to a replaceable cutting tool using a cutting insert for thread machining.
従来から、ねじ切り加工に用いられる刃先交換式の転削工具が知られている。例えば、特許文献１には、交換可能な切削インサートを備えたねじ切りフライス工具が開示されている。切削インサートは、略長方形に形成され、その長辺に相当する辺稜部に、加工したい雌ねじ又は雄ねじの形状に即した形状の切れ刃が形成されている。このような切削インサートは、転削工具用のボデーに取り付けられ、フライス工具自体が回転軸線を中心に回転してワークにねじ部を加工する。 2. Description of the Related Art Conventionally, a cutting edge exchange type cutting tool used for thread cutting has been known. For example, Patent Document 1 discloses a thread cutting milling tool having a replaceable cutting insert. The cutting insert is formed in a substantially rectangular shape, and a cutting edge having a shape corresponding to the shape of a female screw or a male screw to be processed is formed at a side edge portion corresponding to a long side of the cutting insert. Such a cutting insert is attached to a body for a rolling tool, and the milling tool itself rotates about a rotation axis to machine a thread portion on a work.
ねじ加工用の切削インサートをボデーに固定する手段として、例えば特許文献１に開示されているように、切削インサートの上面に形成された凹部にボルトを挿入し、そのボルトの軸力によって切削インサートに力を加えてそれを固定するという形式がある。 As a means for fixing a cutting insert for threading to a body, for example, as disclosed in Patent Document 1, a bolt is inserted into a recess formed on the upper surface of the cutting insert, and the cutting insert is attached to the cutting insert by the axial force of the bolt. There is a form where force is applied to fix it.
上述した凹部にボルトを挿入して切削インサートを固定する形式の場合、ボルトの先端部分やインサートに形成される凹部の精度によって、ボルトの軸力が十分に切削インサートに加わらない状態で取り付けられることがあったり、ボルトと凹部との当接箇所がばらついて切削インサートの位置精度に影響が出たりすることがあったりする。特に、ボルトを凹部に対して斜めに挿入する形式の場合にはボルトと凹部との間に隙間が生じやすくなり、切削インサートに軸力がほとんど加わっていない状態になることもある。 In the case of the type in which the bolt is inserted into the above-mentioned recess to fix the cutting insert, it should be installed in a state where the axial force of the bolt is not sufficiently applied to the cutting insert due to the accuracy of the tip of the bolt and the recess formed in the insert. There is a possibility that the contact position between the bolt and the concave portion will vary, and the positional accuracy of the cutting insert will be affected. In particular, in the case of the type in which the bolt is inserted obliquely into the recess, a gap is likely to be formed between the bolt and the recess, and the cutting insert may be in a state where almost no axial force is applied.
また、貫通孔が形成されたインサートに対して締結ねじを入れる場合と比べて凹部は浅いので、ボルトの頭部が飛び出やすい状態にある。そのため、飛び出たボルトの頭部が切れ刃の回転軌跡上に入り込み、加工中に被削材（ワーク）と接触するおそれがある。 Further, since the recess is shallower than in the case where the fastening screw is inserted into the insert having the through hole, the head of the bolt is likely to pop out. Therefore, there is a possibility that the head of the bolt that has jumped out may enter the rotation locus of the cutting edge and come into contact with the work material (workpiece) during machining.
本発明は上記の課題を鑑み、これを解決すべく開発された。すなわち、本発明は切削インサートのクランプ状態が安定しており、なおかつ締結部材の頭部がワークと接触しない刃先交換式切削工具を提供することを目的とする。 The present invention has been developed in order to solve the above problems. That is, an object of the present invention is to provide a cutting edge exchange type cutting tool in which the clamping state of the cutting insert is stable and the head of the fastening member does not come into contact with the work.
本発明の一態様に係る刃先交換式切削工具は、回転軸線を中心に回転可能なボデーと、該ボデーに取り付けられた交換可能な切削インサートと、該切削インサートをボデーに固定する締結部材と、を備えている。締結部材の先端部は、先細りのテーパ面に形成されている。切削インサートは、一対の長辺及び一対の短辺を有する矩形にそれぞれ形成された上面及び下面と、上面及び下面を接続する側面と、を有している。長辺において上面と側面とが交差する交差稜線部には、切れ刃が形成されている。上面には、有底の凹部が形成されている。凹部の内壁面の少なくとも一部は、該凹部の中心軸に向かって膨らんだ湾曲面である。凹部の中心軸を含み、ボデーの回転軸線に平行な第１仮想基準面と、凹部の中心軸を含み、ボデーの回転軸線に直交する第２仮想基準面と、によって凹部を第１乃至第４領域に四分割したとき、第２領域は、凹部においてボデーの回転軸線に近い中心側且つボデーの基端側に位置している。締結部材のテーパ面は、第２領域において湾曲面に当接する。締結部材の中心軸線は、先端部とは反対側の頭部が、先端部よりもボデーの中心側且つ基端側に位置する向きに傾斜している。 The replaceable cutting edge tool according to an aspect of the present invention is a body rotatable about a rotation axis, a replaceable cutting insert attached to the body, and a fastening member for fixing the cutting insert to the body, Equipped with. The tip of the fastening member is formed into a tapered taper surface. The cutting insert has an upper surface and a lower surface formed in a rectangle having a pair of long sides and a pair of short sides, and a side surface connecting the upper surface and the lower surface. A cutting edge is formed at the intersecting ridge portion where the upper surface and the side surface intersect on the long side. A bottomed recess is formed on the upper surface. At least a part of the inner wall surface of the recess is a curved surface that bulges toward the central axis of the recess. The first to fourth recesses are formed by a first virtual reference plane that includes the center axis of the recess and is parallel to the rotation axis of the body, and a second virtual reference plane that includes the center axis of the recess and is orthogonal to the rotation axis of the body. When divided into four regions, the second region is located in the concave portion on the center side near the rotation axis of the body and on the base end side of the body. The tapered surface of the fastening member contacts the curved surface in the second region. The central axis of the fastening member is inclined such that the head portion on the side opposite to the tip portion is located closer to the center side and the base end side of the body than the tip portion.
この態様によれば、締結部材の中心軸線が傾斜し、締結部材の頭部が切れ刃から遠ざかる側に倒れている。頭部と切れ刃との間のスペースが広くなり、該頭部がワークと接触しにくい。テーパ面が湾曲面に対して斜めに摺接して締結部材の軸力を切削インサートに伝えるため、切削インサートがボデーに強固に固定される。これにより、切削インサートのクランプ状態が安定しており、なおかつ締結部材の頭部がワークと接触しない刃先交換式切削工具を提供することができる。 According to this aspect, the central axis of the fastening member is inclined, and the head of the fastening member is tilted to the side away from the cutting edge. The space between the head and the cutting edge becomes wider, and the head is less likely to contact the work. Since the tapered surface slidably contacts the curved surface to transmit the axial force of the fastening member to the cutting insert, the cutting insert is firmly fixed to the body. This makes it possible to provide a cutting edge exchangeable cutting tool in which the clamping state of the cutting insert is stable and the head of the fastening member does not come into contact with the work.
上記態様において、刃先交換式切削工具は、凹部が複数形成され、切削インサートの基端に最も近い凹部に挿入される第１の締結部材の中心軸線と第１仮想基準面とがなす角度が、切削インサートの先端に最も近い凹部に挿入される第２の締結部材の中心軸線と第１仮想基準面とがなす角度よりも小さいことが好ましい。 In the above aspect, in the cutting edge exchange-type cutting tool, a plurality of recesses are formed, and the angle formed by the central axis of the first fastening member and the first virtual reference plane that is inserted into the recess closest to the base end of the cutting insert is, It is preferable that the angle is smaller than the angle formed by the central axis of the second fastening member and the first virtual reference plane, which is inserted into the recess closest to the tip of the cutting insert.
この態様によれば、切削インサートの基端側の締結部材と先端側の締結部材とで中心軸線の傾斜方向が互いに異なる。締結部材の先端部が切削インサートの凹部を押圧する方向が僅かにずれて、複数の方向から切削インサートをボデーに押し付けることができ、切削インサートをより安定的にしてクランプすることができる。なお、中心軸線と第１仮想基準面とがなす角度は、中心軸線の方向ベクトルと第１仮想基準面の法線ベクトルとがなす角度の余角（ｃｏｍｐｌｅｍｅｎｔａｒｙ ａｎｇｌｅ）として求められる。同様に、中心軸線と第２仮想基準面とがなす角度は、中心軸線の方向ベクトルと第２仮想基準面の法線ベクトルとがなす角度の余角として求められる。 According to this aspect, the direction of inclination of the central axis differs between the fastening member on the base end side and the fastening member on the tip end side of the cutting insert. The tip of the fastening member presses the concave portion of the cutting insert in a slightly deviated direction, the cutting insert can be pressed against the body from a plurality of directions, and the cutting insert can be clamped more stably. The angle formed by the central axis and the first virtual reference plane is obtained as a complementary angle of the angle formed by the direction vector of the central axis and the normal vector of the first virtual reference plane. Similarly, the angle formed by the central axis and the second virtual reference plane is obtained as the complement of the angle formed by the direction vector of the central axis and the normal vector of the second virtual reference plane.
上記態様において、刃先交換式切削工具は、切削インサートの切れ刃がねじ加工用の切れ刃であってもよい。 In the above aspect, in the cutting edge exchangeable cutting tool, the cutting edge of the cutting insert may be a thread cutting edge.
この態様によれば、略矩形の切削インサートを安定して確実にクランプすることができるため、ねじ加工用に好適である。 According to this aspect, the substantially rectangular cutting insert can be stably and reliably clamped, and thus is suitable for thread processing.
本発明の刃先交換式切削工具によれば、切削インサートのクランプ状態が従来よりも安定する。すなわち、切削インサートをより強固に固定できるようになる。また、本発明の刃先交換式切削工具は切削インサートに形成された凹部を締結部材で押圧して固定する形式のクランプ方法であるにもかかわらず、締結部材の先端部が切れ刃の回転軌跡に重畳せず、安定して切削することができる。 According to the cutting edge exchange type cutting tool of the present invention, the clamping state of the cutting insert is more stable than before. That is, the cutting insert can be fixed more firmly. In addition, the cutting edge exchangeable cutting tool of the present invention is a clamping method of a type in which the concave portion formed in the cutting insert is pressed and fixed by the fastening member, but the tip end of the fastening member becomes the rotation locus of the cutting edge. Stable cutting is possible without overlapping.
以下、本発明の一実施形態を、図面を用いて説明する。なお、各図において、同一の符号を付したものは、同一又は同様の構成を有する。本発明の各実施形態の刃先交換式切削工具１０（以下、「切削工具１０」と略記する）は、締結ねじ４０の先端部が先細りのテーパ面４１を有し、切削インサート２０の凹部２３が中心に向かって膨らんだ湾曲面２３２を有している。締結ねじ４０の中心軸線Ｃ１は、締結ねじ４０の頭部４２が締結ねじ４０の先端部よりもボデー３０の中心側且つ基端側に位置するように傾斜している。締結ねじ４０のテーパ面４１と切削インサート２０の湾曲面２３２との当接箇所Ｘは、凹部２３の他の領域５２，５３，５４よりもボデー３０の中心側且つ基端側に位置した第２領域５２内にある（図９及び図１０参照）。 An embodiment of the present invention will be described below with reference to the drawings. In addition, in each of the drawings, those denoted by the same reference numerals have the same or similar configurations. The cutting edge replaceable cutting tool 10 of each embodiment of the present invention (hereinafter, abbreviated as “cutting tool 10”) has a taper surface 41 where the tip of the fastening screw 40 is tapered, and the recess 23 of the cutting insert 20 is It has a curved surface 232 that bulges toward the center. The central axis C1 of the fastening screw 40 is inclined so that the head 42 of the fastening screw 40 is located closer to the center side and the proximal end side of the body 30 than the tip end portion of the fastening screw 40. The contact point X between the tapered surface 41 of the fastening screw 40 and the curved surface 232 of the cutting insert 20 is located at the center side and the base end side of the body 30 with respect to the other regions 52, 53, 54 of the recess 23. It is in the area 52 (see FIGS. 9 and 10).
締結ねじ４０の頭部４２が刃先２１から遠ざかる向きに配置されるため、該頭部４２がワークと接触しにくい。テーパ面４１が湾曲面２３２に斜めに摺接して締結ねじ４０の軸力を切削インサート２０に伝えるため、切削インサート２０がボデー３０に強固に固定される。以下、図１から図１１を参照して各構成について詳しく説明する。 Since the head 42 of the fastening screw 40 is arranged in a direction away from the cutting edge 21, it is difficult for the head 42 to contact the work. Since the tapered surface 41 slidably contacts the curved surface 232 and transmits the axial force of the fastening screw 40 to the cutting insert 20, the cutting insert 20 is firmly fixed to the body 30. Hereinafter, each configuration will be described in detail with reference to FIGS. 1 to 11.
図１は、本発明の一実施形態の切削工具１０を示す斜視図であり、図２は、図１とは異なる角度から見た切削工具１０を示す斜視図である。図１及び図２に示すように、刃先交換式切削工具１０は、二つの略長方形の切削インサート２０と、切削インサート２０を保持するためのボデー３０と、切削インサート２０をボデー３０に固定するための締結部材（例えば、締結ねじ４０）と、を備えている。なお、切削インサート２０の数は、図示した例に限定されず、一つであってもよいし、三つ以上であってもよい。 FIG. 1 is a perspective view showing a cutting tool 10 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the cutting tool 10 seen from an angle different from FIG. As shown in FIGS. 1 and 2, the cutting edge replaceable cutting tool 10 includes two substantially rectangular cutting inserts 20, a body 30 for holding the cutting inserts 20, and a body for fixing the cutting inserts 20 to the body 30. Fastening member (for example, fastening screw 40). The number of cutting inserts 20 is not limited to the illustrated example, and may be one or three or more.
図３は、図１に示された切削工具１０の正面図であり、図４は、図１に示された切削工具１０の左側面図である。図３及び図４に示すように、以下の説明においては便宜的にボデー３０の回転軸線Ｃ０に平行な軸線をＸ軸と定め、Ｘ軸に垂直かつ後述するチップ座３１１の底面３１１ａに垂直な軸をＹ軸と定め、Ｘ軸に垂直かつチップ座３１１の底面３１１ａに平行な軸をＺ軸と定める。 3 is a front view of the cutting tool 10 shown in FIG. 1, and FIG. 4 is a left side view of the cutting tool 10 shown in FIG. As shown in FIGS. 3 and 4, for convenience, in the following description, the axis parallel to the rotation axis C0 of the body 30 is defined as the X axis, and is perpendicular to the X axis and perpendicular to the bottom surface 311a of the tip seat 311 described later. The axis is defined as the Y axis, and the axis perpendicular to the X axis and parallel to the bottom surface 311a of the tip seat 311 is defined as the Z axis.
また、一方の物体が他方の物体よりもＸ軸の矢印（アローヘッド）側にあるとき、これを「より先端側にある」と説明し、矢印とは反対側にあるときを「より後端側にある」と説明する。また、一方の物体が他方の物体よりもＹ軸の矢印側にあるとき、これを「上方にある」と説明し、矢印とは反対側にあるときを「下方にある」と説明する。また、Ｙ−Ｚ平面において、一方の物体が他方の物体よりも原点（例えば、ボデー３０の回転軸線Ｃ０）に近い位置にあるとき、これを「中心側にある」と説明し、原点から遠い位置にあるときを「外周側にある」と説明する。 Also, when one object is on the side of the arrow (arrow head) on the X axis with respect to the other object, this is described as "more on the tip side", and when it is on the opposite side of the arrow, "more on the rear end". It is on the side." Further, when one object is on the arrow side of the Y axis with respect to the other object, this is described as “above”, and when it is on the opposite side to the arrow is described as “below”. Further, when one of the objects is closer to the origin (for example, the rotation axis C0 of the body 30) than the other object on the YZ plane, this will be described as “located on the center side” and far from the origin. When it is in the position, it will be described as "outer peripheral side".
ボデー３０は円筒状の第１円筒部３１と、第１円筒部３１よりも直径が大きく、第１円筒部３１の後端側に接続する第２円筒部３２と、を備えている。第１円筒部３１には切削インサート２０を挿入するための二つのチップ座３１１、３１２が形成されている。チップ座３１１、３１２は断面形状が略コ字状（Ｕ−ｓｈａｐｅ）の形状の溝（スロット）であり、第１円筒部３１のおおむね全長に亘って形成されている。チップ座３１１、３１２の一方端は第１円筒部３１の端面にまで達し、且つボデー３０の外周面にまで達している。すなわち、二つのチップ座３１１、３１２はボデー３０の先端面及び外周面に開口している。二つのチップ座３１１、３１２を含めた全ての構成において、切削工具１０は１８０°回転対称の形状になっている。そのため、代表して一方側の構成を詳しく説明し、他方側の構成については重複する説明を省略する。 The body 30 includes a cylindrical first cylindrical portion 31 and a second cylindrical portion 32 having a diameter larger than that of the first cylindrical portion 31 and connected to the rear end side of the first cylindrical portion 31. Two tip seats 311 and 312 for inserting the cutting insert 20 are formed in the first cylindrical portion 31. The tip seats 311 and 312 are grooves (slots) having a substantially U-shaped cross section, and are formed over substantially the entire length of the first cylindrical portion 31. One ends of the tip seats 311 and 312 reach the end surface of the first cylindrical portion 31 and reach the outer peripheral surface of the body 30. That is, the two chip seats 311 and 312 are open to the tip end surface and the outer peripheral surface of the body 30. In all the configurations including the two tip seats 311, 312, the cutting tool 10 has a 180° rotationally symmetrical shape. Therefore, the configuration on one side will be described in detail as a representative, and duplicate description of the configuration on the other side will be omitted.
チップ座３１１の構成について詳述する。チップ座３１１は切削インサート２０との当接部となる底面３１１ａと、ボデー３０の中心側に位置して底面３１１ａに対して垂直に延び、その壁面の法線がＺ軸方向に向く周方向拘束壁３１１ｂと、ボデー３０の後端側に位置して底面３１１ａに対して垂直に延び、その壁面の法線がＸ軸方向を向く軸方向拘束壁３１１ｃと、底面３１１ａの上側に位置し周方向拘束壁３１１ｂ及び軸方向拘束壁３１１ｃと接続する天井壁３１１ｄと、を備えている。 The structure of the tip seat 311 will be described in detail. The tip seat 311 is located on the center side of the body 30 and extends perpendicularly to the bottom surface 311a, which is a contact portion with the cutting insert 20, and extends in a direction perpendicular to the bottom surface 311a. The wall 311b, the axial restraint wall 311c located on the rear end side of the body 30 and extending perpendicularly to the bottom surface 311a, and the normal of the wall surface faces the X-axis direction, and the circumferential direction located above the bottom surface 311a. And a ceiling wall 311d connected to the constraining wall 311b and the axial constraining wall 311c.
底面３１１ａと軸方向拘束壁３１１ｃとの接続部には、切削インサート２０を取り付けた際に切削インサート２０の辺稜部の一部（後述する下面２２の短辺２２２及びその近傍）が接続部に衝突することを防ぐためのぬすみ（凹部）が形成されている。同様に、天井壁３１１ｄと軸方向拘束壁３１１ｃとの接続部にも切削インサート２０の辺稜部の一部（後述する上面２４の短辺２４２辺及びその近傍）が接続部に衝突することを防ぐためのぬすみが形成されている。 At the connecting portion between the bottom surface 311a and the axial constraining wall 311c, when the cutting insert 20 is attached, a part of the side edge portion of the cutting insert 20 (a short side 222 of the lower surface 22 described below and its vicinity) becomes the connecting portion. A recess (a recess) is formed to prevent collision. Similarly, at the connecting portion between the ceiling wall 311d and the axial constraining wall 311c, a part of the side edge portion of the cutting insert 20 (short side 242 side of the upper surface 24 described below and its vicinity) may collide with the connecting portion. A dullness is formed to prevent it.
周方向拘束壁３１１ｂの中央部には凹み部３５が形成されている。凹み部３５が形成されることにより、切削インサート２０と周方向拘束壁３１１ｂとの接触箇所を、クランプの状態が安定しにくい周方向拘束壁３１１ｂの中央ではなく、先端側又は後端側に限定することができる。 A recess 35 is formed at the center of the circumferential restraint wall 311b. By forming the recessed portion 35, the contact portion between the cutting insert 20 and the circumferential restraint wall 311b is limited to the front end side or the rear end side, not the center of the circumferential restraint wall 311b in which the clamp state is difficult to stabilize. can do.
図５は、図１に示された切削工具１０の平面図であり、図６は、図１に示された切削工具１０から切削インサートを取り外した状態を示す斜視図である。図５及び図６に示すように、天井壁３１１ｄには貫通孔３３が二つ形成されている。これらの貫通孔３３に締結ねじ４０が挿通され、締結ねじ４０がチップ座３１１に取り付けられた切削インサート２０を底面３１１ａに押し付けて固定する。 5 is a plan view of the cutting tool 10 shown in FIG. 1, and FIG. 6 is a perspective view showing a state in which the cutting insert is removed from the cutting tool 10 shown in FIG. As shown in FIGS. 5 and 6, two through holes 33 are formed in the ceiling wall 311d. The fastening screw 40 is inserted through these through holes 33, and the fastening screw 40 presses and fixes the cutting insert 20 attached to the tip seat 311 against the bottom surface 311a.
第１円筒部３１に形成される貫通孔３３のうち最も後端側に位置する貫通孔３３の近傍には、切削インサート２０の冷却をするためのクーラントの噴射口３４が形成されている。第２円筒部３２は図示しない工作機械によって把持される部分である。 A coolant injection port 34 for cooling the cutting insert 20 is formed in the vicinity of the through hole 33 located closest to the rear end of the through holes 33 formed in the first cylindrical portion 31. The second cylindrical portion 32 is a portion gripped by a machine tool (not shown).
切削インサート２０は、その一方の長辺２４１側の辺稜部にだけ、すなわち略矩形の辺稜部（２４１，２４２，２４３，２４４）のうち長辺２４１にだけ、所望の雌ねじ又は雄ねじ形状に応じた山部分と谷部分とが交互に複数形成された切れ刃２１を備えている。図７Ａは、切削インサート２０の斜視図であり、図７Ｂは、切削インサート２０の正面図であり、図７Ｃは、切削インサート２０の平面図である。図７Ｂに示すように、切れ刃２１に接続するすくい面のすくい角はプラスの角度となっている。切削インサート２０はチップ座に３１１に取り付けられたとき、周方向拘束壁３１１ｂと、軸方向拘束壁３１１ｃとに当接する。 The cutting insert 20 has a desired internal thread or external thread shape only on one side ridge portion on the long side 241 side, that is, only on the long side 241 of the substantially rectangular side ridge portions (241, 242, 243, 244). The cutting edge 21 has a plurality of corresponding peaks and valleys alternately formed. 7A is a perspective view of the cutting insert 20, FIG. 7B is a front view of the cutting insert 20, and FIG. 7C is a plan view of the cutting insert 20. As shown in FIG. 7B, the rake angle of the rake face connected to the cutting edge 21 is a positive angle. When the cutting insert 20 is attached to the tip seat 311, it abuts on the circumferential constraining wall 311b and the axial constraining wall 311c.
切削インサート２０は、上面２４と、上面２４に対向する下面２２と、上面２４及び下面２２を繋ぐ側面２５と、を備えている。上面２４は、一対の長辺２４１，２４３と、一対の短辺２４２，２４４と、を有した略矩形に形成されている。同様に、下面２２は、一対の長辺２２１，２２３と、一対の短辺２２２，２２４と、を有した略矩形に形成されている。 The cutting insert 20 includes an upper surface 24, a lower surface 22 facing the upper surface 24, and a side surface 25 connecting the upper surface 24 and the lower surface 22. The upper surface 24 is formed in a substantially rectangular shape having a pair of long sides 241 and 243 and a pair of short sides 242 and 244. Similarly, the lower surface 22 is formed in a substantially rectangular shape having a pair of long sides 221 and 223 and a pair of short sides 222 and 224.
以下の説明において、上面２４の四辺２４１，２４２，２４３，２４４をまとめて上面２４の辺稜部と呼称し、下面２２の辺２２１，２２２，２２３，２２４をまとめて下面２２の辺稜部と呼称することがある。長辺２４１，２４３は、上面２４が有する長い方の辺稜部であり、短辺２４２，２４４は、上面２４が有する短い方の辺稜部である。同様に、長辺２２１，２２３は、下面２２が有する長い方の辺稜部であり、短辺２２２，２２４は、下面２２が有する短い方の辺稜部である。 In the following description, the four sides 241, 242, 243, 244 of the upper surface 24 are collectively referred to as a side edge portion of the upper surface 24, and the sides 221, 222, 223, 224 of the lower surface 22 are collectively referred to as a side edge portion of the lower surface 22. May be called. The long sides 241 and 243 are longer side ridges of the upper surface 24, and the short sides 242 and 244 are shorter side ridges of the upper surface 24. Similarly, the long sides 221 and 223 are longer side ridges of the lower surface 22, and the short sides 222 and 224 are shorter side ridges of the lower surface 22.
下面２２はチップ座３１１の底面３１１ａとの当接面になる。上面２４にはボデー３０の貫通孔３３に挿通された締結ねじ４０が当接可能な凹部２３が形成されている。図示した例では、凹部２３の内壁面が、上面２４から離れるに従って縮径する傾斜面２３２と、上面２４に平行な底面２３１と、を組み合わせた略円錐台に形成されている。より詳しくは、傾斜面２３２が、凹部２３の中心軸に向かって膨らむように湾曲する湾曲面に形成されている。以下の説明において、傾斜面２３２を湾曲面２３２と呼称することがある。 The lower surface 22 becomes a contact surface with the bottom surface 311a of the tip seat 311. The upper surface 24 is formed with a recess 23 into which the fastening screw 40 inserted in the through hole 33 of the body 30 can abut. In the illustrated example, the inner wall surface of the concave portion 23 is formed into a substantially truncated cone shape in which an inclined surface 232 whose diameter is reduced with increasing distance from the upper surface 24 and a bottom surface 231 parallel to the upper surface 24 are combined. More specifically, the inclined surface 232 is formed as a curved surface that curves so as to expand toward the central axis of the recess 23. In the following description, the inclined surface 232 may be referred to as the curved surface 232.
次に切削インサート２０の凹部２３と締結ねじ４０との関係について説明する。図９は切削インサート２０をＸ−Ｚ平面で、すなわち上面２４に対向する方向から見た平面図であり、それぞれの凹部２３をＸ軸に平行な仮想基準線ＩＬ１及びＺ軸に平行な仮想基準線ＩＬ２で四つの領域に区切っている。以下の説明では便宜的に、「上面２４に対向する方向から見た」位置関係を「平面視」における位置関係と呼称することがある。 Next, the relationship between the recess 23 of the cutting insert 20 and the fastening screw 40 will be described. FIG. 9 is a plan view of the cutting insert 20 in the XZ plane, that is, as viewed from the direction facing the upper surface 24. The respective recesses 23 are virtual reference lines IL1 parallel to the X axis and virtual reference lines parallel to the Z axis. It is divided into four regions by a line IL2. In the following description, for convenience, the positional relationship “as viewed from the direction facing the upper surface 24” may be referred to as the positional relationship in “plan view”.
また、二つの仮想基準線ＩＬ１，ＩＬ２によって区切られた四つの領域について、図中の右上に位置する領域から反時計回りに順に、第１領域５１、第２領域５２、第３領域５３及び第４領域５４と呼称する。つまり、区分けされた四つの領域のうち、相対的に外周側に位置しかつ相対的に後端側に位置する領域を第１領域５１と呼称し、第１領域５１よりも中心側に位置する領域を第２領域５２と呼称し、第２領域５２よりも先端側に位置する領域を第３領域５３と呼称し、第３領域５３よりも外周側に位置する領域を第４領域５４と呼称する。 Further, with respect to the four areas divided by the two virtual reference lines IL1 and IL2, the first area 51, the second area 52, the third area 53, and the third area 53 are arranged in the counterclockwise order from the area located at the upper right of the drawing. It is referred to as a 4-region 54. That is, of the four divided areas, the area located relatively on the outer peripheral side and relatively located on the rear end side is referred to as a first area 51, and is located closer to the center than the first area 51. The region is referred to as a second region 52, the region located on the tip side of the second region 52 is referred to as a third region 53, and the region located on the outer peripheral side of the third region 53 is referred to as a fourth region 54. To do.
前述した第１乃至第４領域５１，５２，５３，５４を異なる観点からさらに説明する。凹部２３の中心軸Ｃ２を含み、ボデー３０の回転軸線Ｃ０に平行な平面を第１仮想基準面ＩＳ１と定義する。凹部２３の中心軸Ｃ２を含み、ボデー３０の回転軸線Ｃ０に直交する平面を第２仮想基準面ＩＳ２と定義する。前述した第１仮想基準線ＩＬ１は、第１仮想基準面ＩＳ１と、上面２４と同一平面上の仮想平面ＩＳ０（図１０に示す）との交線である。前述した第２仮想基準線ＩＬ２は、第２仮想基準面ＩＳ２と仮想平面ＩＳ０との交線である。 The above-mentioned first to fourth regions 51, 52, 53, 54 will be further described from different viewpoints. A plane including the central axis C2 of the recess 23 and parallel to the rotation axis C0 of the body 30 is defined as a first virtual reference plane IS1. A plane including the central axis C2 of the recess 23 and orthogonal to the rotation axis C0 of the body 30 is defined as a second virtual reference plane IS2. The first virtual reference line IL1 described above is a line of intersection between the first virtual reference plane IS1 and a virtual plane IS0 (shown in FIG. 10) that is coplanar with the upper surface 24. The aforementioned second virtual reference line IL2 is a line of intersection between the second virtual reference plane IS2 and the virtual plane IS0.
第１及び第２仮想基準面ＩＳ１，ＩＳ２によって各々の凹部２３を第１乃至第４領域５１，５２，５３，５４に四分割したとき、ボデー３０の回転軸線Ｃ０に近い中心側且つボデー３０の基端側に位置した領域が第２領域５２である。同様に、ボデー３０の回転軸線Ｃ０から遠い外周側且つボデー３０の基端側に位置した領域が第１領域５１であり、ボデー３０の回転軸線Ｃ０に近い中心側且つボデー３０の先端側に位置した領域が第３領域５１であり、ボデー３０の回転軸線Ｃ０から遠い外周側且つボデー３０の先端側に位置した領域が第４領域５４である。 When each recess 23 is divided into first to fourth regions 51, 52, 53, 54 by the first and second virtual reference planes IS1, IS2, the center side of the body 30 close to the rotation axis C0 and the body 30 of the body 30 is divided. The region located on the base end side is the second region 52. Similarly, a region located on the outer peripheral side far from the rotation axis C0 of the body 30 and on the base end side of the body 30 is the first region 51, which is located on the center side near the rotation axis C0 of the body 30 and on the tip side of the body 30. The region formed is the third region 51, and the region located on the outer peripheral side far from the rotation axis C0 of the body 30 and on the tip side of the body 30 is the fourth region 54.
切削インサート２０がチップ座３１１に設置された際、全ての締結ねじ４０は切削インサート２０の凹部２３の第２領域５２において当接する。また、締結ねじ４０中心軸線はＹ軸に対して傾斜しており、その傾斜方向は第２領域５２から第２領域５２の対角に位置する第４領域５４に向うように傾斜し、なおかつ第２領域５２から第４領域５４に向うに従い下がるように傾斜している。換言すると、締結ねじ４０の中心軸線Ｃは、先端部（例えば、テーパ面４１）とは反対側の頭部４２が、先端部よりもボデー３０の中心側且つ基端側に位置する向きに傾斜している。 When the cutting insert 20 is installed on the tip seat 311, all the fastening screws 40 abut on the second region 52 of the recess 23 of the cutting insert 20. Further, the central axis of the fastening screw 40 is inclined with respect to the Y-axis, and the inclination direction is inclined from the second region 52 to the fourth region 54 located diagonally of the second region 52, and further, It inclines so that it may go down as it goes from the 2nd area 52 to the 4th area 54. In other words, the central axis C of the fastening screw 40 is inclined such that the head 42 on the side opposite to the tip (for example, the tapered surface 41) is located closer to the center and the base end of the body 30 than the tip. doing.
図９は、締結ねじ４０の中心軸線Ｃ１の向きを説明する平面図であり、図１０は、図９のＸ−Ｘ線に沿う断面図である。図９に示すように、締結ねじ４０の中心軸線Ｃ１は、Ｘ−Ｚ平面で見ると第２領域５２と第４領域５４との両方に跨るように傾斜している。また、図１０に示すように、中心軸線Ｃ１は第２領域５２に含まれる部分の方が、第４領域５４に含まれる部分よりも上側に位置する関係になるようにも傾斜している。 9 is a plan view illustrating the direction of the central axis C1 of the fastening screw 40, and FIG. 10 is a cross-sectional view taken along the line XX of FIG. As shown in FIG. 9, the central axis C1 of the fastening screw 40 is inclined so as to straddle both the second region 52 and the fourth region 54 when viewed in the XZ plane. Further, as shown in FIG. 10, the central axis C1 is also inclined so that the portion included in the second region 52 is positioned above the portion included in the fourth region 54.
図８Ａは、締結ねじ４０の斜視図であり、図８Ｂは、締結ねじ４０の正面図である。図８Ａ及び図８Ｂに示すように、締結ねじ４０の先端部は、先端に向かうに従って縮径するテーパ面４１に形成されている。切削インサート２０をボデー３０に取り付けた状態において、テーパ面４１が切削インサート２０の凹部２３の内壁に当接する。 FIG. 8A is a perspective view of the fastening screw 40, and FIG. 8B is a front view of the fastening screw 40. As shown in FIGS. 8A and 8B, the tip portion of the fastening screw 40 is formed on a tapered surface 41 whose diameter decreases toward the tip. When the cutting insert 20 is attached to the body 30, the tapered surface 41 contacts the inner wall of the recess 23 of the cutting insert 20.
換言すると、切削工具１０は、切削インサート２０と、切削インサート２０を保持するためのボデー３０と、切削インサート２０をボデー３０に固定するための締結部材（例えば、締結ねじ４０）と、を備えている。切削インサート２０は、切削インサート２０の上面２４が有する長い方の辺稜部（すなわち長辺２４１）と、切削インサート２０の側面２５との交差稜線部に切れ刃２１が形成されている。切削インサート２０は。ボデー３０に形成された断面コ字状のチップ座３１１，３１２に設置される。切削インサート２０の上面２４には、底を有する凹部２３が形成されている。凹部２３の内壁面（２３１，２３２）の少なくとも一部は、該凹部２３の中心軸Ｃ２に向って凸になっている湾曲面２３２である。締結部材（４０）における凹部２３との当接箇所Ｘは、テーパ面４１に形成されている。凹部２３の縁部を含む仮想平面ＩＳ０（例えば、上面２４と同一平面）に対向する方向から見て、ボデー３０の回転軸線Ｃ０を該仮想平面ＩＳ０に射影してできる仮想線に平行な第１仮想基準線ＩＬ１と、該第１仮想基準線ＩＬ１に直交する第２仮想基準線ＩＬ２と、で該凹部２３を四つの領域（５１，５２，５３，５４）に区分する。このとき、該凹部２３と締結部材（４０）との当接箇所Ｘはボデー３０の回転軸線Ｃ０側且つボデー３０の基端側の第２領域５２内にある。締結部材（４０）の中心軸線Ｃ１は第２領域５２から該第２領域５２の対角に位置する第４領域５４に向けて下る向きに傾斜している。 In other words, the cutting tool 10 includes a cutting insert 20, a body 30 for holding the cutting insert 20, and a fastening member (for example, fastening screw 40) for fixing the cutting insert 20 to the body 30. There is. In the cutting insert 20, a cutting edge 21 is formed at an intersecting ridge portion between a long side ridge portion (that is, the long side 241) of the upper surface 24 of the cutting insert 20 and a side surface 25 of the cutting insert 20. The cutting insert 20. The chip seats 311 and 312 having a U-shaped cross section are formed on the body 30. The upper surface 24 of the cutting insert 20 is formed with a recess 23 having a bottom. At least a part of the inner wall surfaces (231, 232) of the recess 23 is a curved surface 232 that is convex toward the central axis C2 of the recess 23. The contact portion X of the fastening member (40) with the recess 23 is formed on the tapered surface 41. The first axis parallel to the virtual line formed by projecting the rotation axis C0 of the body 30 onto the virtual plane IS0 when viewed from the direction facing the virtual plane IS0 including the edge of the recess 23 (for example, the same plane as the upper surface 24). The recess 23 is divided into four regions (51, 52, 53, 54) by the virtual reference line IL1 and the second virtual reference line IL2 orthogonal to the first virtual reference line IL1. At this time, the contact point X between the recess 23 and the fastening member (40) is in the second region 52 on the rotation axis C0 side of the body 30 and on the base end side of the body 30. The central axis C1 of the fastening member (40) is inclined downward from the second region 52 toward the fourth region 54 located diagonally of the second region 52.
次に、本実施形態の切削工具１０の効果について説明する。切削インサート２０は雌ねじ等の形状に対応した形状の切れ刃２１を有しているため、転削加工で雌ねじ等を加工成形することができる。また、切削工具１０は二枚の切削インサート２０を備えているため、効率の良い加工を行うことができる。 Next, the effect of the cutting tool 10 of this embodiment will be described. Since the cutting insert 20 has the cutting edge 21 having a shape corresponding to the shape of the internal thread or the like, the internal thread or the like can be formed by rolling. Further, since the cutting tool 10 includes the two cutting inserts 20, it is possible to perform efficient processing.
締結ねじ４０と切削インサート２０の凹部２３との当接箇所Ｘは、凹部２３の第２領域５２内であるので、締結ねじ４０は切削インサート２０に対して周方向拘束壁３１１ｂ及び軸方向拘束壁３１１ｃに向う方向の力を加えることができる。その結果、切削インサート２０には効率的に力が加わり、なおかつ二方向の動きが拘束されるため安定的にクランプされる。また、締結ねじ４０のテーパ面４１と、凹部２３の湾曲した内壁とを当接させるようにしたことで、両者が確実に当接するようになっている。 Since the contact point X between the fastening screw 40 and the recess 23 of the cutting insert 20 is within the second region 52 of the recess 23, the fastening screw 40 is attached to the cutting insert 20 by the circumferential restraint wall 311b and the axial restraint wall. A force in the direction toward 311c can be applied. As a result, a force is efficiently applied to the cutting insert 20, and since the movement in two directions is restricted, the cutting insert 20 is stably clamped. Further, the tapered surface 41 of the fastening screw 40 and the curved inner wall of the concave portion 23 are brought into contact with each other, so that both are surely brought into contact with each other.
締結ねじ４０の中心軸線Ｃ１が第２領域５２から第４領域５４に向うに従い下がるように傾斜しているため、締結ねじ４０の頭部４２が切れ刃の回転軌跡を干渉しにくくなる。すなわち、通常、止まり穴（有底の凹部）に締結ねじを挿通すると締結ねじの頭部４２を十分に埋没させることができないため、切削インサート２０の形状や配置方法によっては、突出した締結ねじの頭部４２が切れ刃２１の回転軌跡に重畳することがある。しかしながら、切削工具１０では、締結ねじ４０の中心軸線Ｃ１がＹ軸に対して傾斜しているため、締結ねじ４０の頭部４２を切れ刃１０の回転軌跡からより確実に避けることができる。 Since the central axis C1 of the fastening screw 40 is inclined so as to decrease as it goes from the second region 52 to the fourth region 54, the head 42 of the fastening screw 40 is less likely to interfere with the rotation locus of the cutting edge. That is, normally, when the fastening screw is inserted into the blind hole (bottomed recess), the head 42 of the fastening screw cannot be sufficiently buried, so that depending on the shape of the cutting insert 20 and the arrangement method, the protruding fastening screw may be The head 42 may overlap with the rotation trajectory of the cutting edge 21. However, in the cutting tool 10, since the central axis C1 of the fastening screw 40 is inclined with respect to the Y axis, the head 42 of the fastening screw 40 can be more reliably avoided from the rotation trajectory of the cutting edge 10.
なお、締結ねじ４０の頭部４２を切れ刃２１の回転軌跡からずらす手段は、図９に示した例に限定されない。例えば、他の実施形態として、図１１に示すように、後端側に位置する締結ねじ４０ａの中心軸線をより仮想線ＩＬ１に対して平行に近づく方向に傾斜させ、一方先端側に位置する締結ねじ４０ｂの中心軸線をより仮想線ＩＬ２に対して平行に近づく方向に傾斜させてもよい。換言すると、締結ねじ４０ａの中心軸線と仮想線ＩＬ１とがなす角度を、締結ねじ４０ｂの中心軸線と仮想線ＩＬ１とがなす角度よりも小さくしてもよい。このように、締結ねじ４０ａ，４０ｂの中心軸線の傾斜方向を互いに変え、第２領域内で当接箇所を互いにずらすことで、切削インサート２０をより安定してクランプすることができる。 The means for shifting the head 42 of the fastening screw 40 from the rotation trajectory of the cutting edge 21 is not limited to the example shown in FIG. 9. For example, as another embodiment, as shown in FIG. 11, the central axis of the fastening screw 40a located on the rear end side is inclined in a direction closer to the virtual line IL1 in parallel, and the fastening located on the front end side. The central axis of the screw 40b may be inclined in a direction closer to the virtual line IL2. In other words, the angle formed by the central axis of the fastening screw 40a and the virtual line IL1 may be smaller than the angle formed by the central axis of the fastening screw 40b and the virtual line IL1. In this way, the cutting insert 20 can be clamped more stably by changing the inclination directions of the central axes of the fastening screws 40a and 40b and shifting the contact points in the second region from each other.
また、締結ねじ４０は三つ以上用いることも可能である。その場合、最後端に位置する締結ねじ４０の中心軸線の傾斜方向と最先端に位置する締結ねじ４０の中心軸線の傾斜方向とを、上述したように異ならせればよい。 Further, it is possible to use three or more fastening screws 40. In that case, the direction of inclination of the central axis of the fastening screw 40 located at the rearmost end and the direction of inclination of the central axis of the fastening screw 40 located at the extreme end may be different as described above.
また、締結ねじ４０の先端面は、切削インサート２０の凹部２３の底に当接させないことが好ましい。凹部２３の底に力が加わると、その部位を基点に切削インサート２０が回転しようとして下面２２がチップ座の底面３１１ａ、３１２ａから離れ、クランプ力の低下につながるおそれがある。 Further, it is preferable that the tip end surface of the fastening screw 40 does not contact the bottom of the recess 23 of the cutting insert 20. When a force is applied to the bottom of the recess 23, the lower surface 22 tends to move away from the bottom surfaces 311a and 312a of the tip seats due to the rotation of the cutting insert 20 from that portion as a base point, which may lead to a decrease in the clamping force.
以上、本発明についてその一実施形態を例に説明したが、本発明は上記の実施形態に限定されない。例えば、上記実施形態の切削インサート２０の切れ刃２１は、雌ねじ又は雄ねじを加工するために該雌ねじ等の形状に即した形状をしていたが、本発明において切削インサートの切れ刃は、ねじ切り用に限定されることなく、例えば、肩削り用の切削インサートの切れ刃のような直線形状であってもよい。 Although the present invention has been described above by taking the embodiment as an example, the present invention is not limited to the above embodiment. For example, the cutting edge 21 of the cutting insert 20 of the above-described embodiment has a shape conforming to the shape of the internal thread or the like for processing the internal thread or the external thread. However, in the present invention, the cutting edge of the cutting insert is for thread cutting. However, the shape may be a linear shape such as a cutting edge of a cutting insert for shoulder milling.
また、上記実施形態においては切削インサート２０の上面２４とＸ−Ｚ平面とが平行であったが、これら二つの面が平行でなくてもよい。その場合は、ボデーの回転軸線を切削インサートに形成された凹部の縁部を含む平面に射影し、その射影された線とその線に垂直な線とで凹部を四つの領域に区分けすればよい。このような場合であっても、締結ねじ４０と凹部２３とは第２領域で当接する。 Further, in the above embodiment, the upper surface 24 of the cutting insert 20 and the XZ plane are parallel, but these two surfaces may not be parallel. In that case, the rotation axis of the body is projected onto a plane including the edge of the recess formed in the cutting insert, and the recess may be divided into four regions by the projected line and a line perpendicular to the line. .. Even in such a case, the fastening screw 40 and the recess 23 are in contact with each other in the second region.
また、上述した実施形態における切削インサート２０は、上面２４だけがすくい面として機能しない形状であったが、本発明の切削工具１０はそれに限定されず、上面２４及び下面２２の両方がすくい面として機能し、一つの切削インサートで二回使用できるような形状として構成することも可能である。 Further, the cutting insert 20 in the above-described embodiment has a shape in which only the upper surface 24 does not function as a rake surface, but the cutting tool 10 of the present invention is not limited thereto, and both the upper surface 24 and the lower surface 22 serve as rake surfaces. It can also be configured to function and be used twice with one cutting insert.
１０…切削工具、２０…切削インサート、２１…切れ刃、２２…下面、２３…凹部、２４…上面、２５…側面、３０…ボデー、３１…第１円筒部、３１１，３１２…チップ座、３１１ａ…チップ座の底面、３１１ｂ…周方向拘束壁、３１１ｃ…軸方向拘束壁、３１１ｄ…天井壁、３２…第２円筒部、３３…貫通孔、３４…クーラントの噴射口、３５…凹み部、４０，４０ａ，４０ｂ…締結ねじ（締結部材の一例）、４１…テーパ面、４２…頭部、５１…第１領域、５２…第２領域、５３…第３領域、５４…第４領域、Ｃ０…ボデーの回転軸線、Ｃ１…締結ねじの中心軸線、Ｃ２…凹部の中心軸、ＩＬ１…第１仮想基準線、ＩＬ２…第２仮想基準線、ＩＳ０…仮想平面、ＩＳ１…第１仮想基準面、ＩＳ２…第２仮想基準面、Ｘ…凹部と締結部材との当接箇所。 10... Cutting tool, 20... Cutting insert, 21... Cutting edge, 22... Lower surface, 23... Recessed portion, 24... Upper surface, 25... Side surface, 30... Body, 31... First cylindrical portion, 311, 312... Tip seat, 311a ... Bottom surface of chip seat 311b... Circumferential restraint wall, 311c... Axial restraint wall, 311d... Ceiling wall, 32... Second cylindrical portion, 33... Through hole, 34... Coolant injection port, 35... Recessed portion, 40 , 40a, 40b... Fastening screws (an example of fastening members), 41... Tapered surface, 42... Head, 51... First area, 52... Second area, 53... Third area, 54... Fourth area, C0... Rotation axis of body, C1... Central axis of fastening screw, C2... Central axis of recess, IL1... First virtual reference line, IL2... Second virtual reference line, IS0... Virtual plane, IS1... First virtual reference plane, IS2 ... second virtual reference plane, X ... contact portion between the recess and the fastening member.
Claims (3)
前記締結部材の先端部は、先細りのテーパ面に形成され、
前記切削インサートは、一対の長辺及び一対の短辺を有する矩形にそれぞれ形成された上面及び下面と、前記上面及び前記下面を接続する側面と、を有し、
前記長辺において前記上面と前記側面とが交差する交差稜線部には、切れ刃が形成され、
前記上面には、有底の凹部が形成され、
前記凹部の内壁面の少なくとも一部は、該凹部の中心軸に向かって膨らんだ湾曲面であり、
前記凹部の前記中心軸を含み、前記ボデーの前記回転軸線に平行な第１仮想基準面と、
前記凹部の前記中心軸を含み、前記ボデーの前記回転軸線に直交する第２仮想基準面と、によって前記凹部を第１乃至第４領域に四分割したとき、
前記第２領域は、前記凹部において前記ボデーの前記回転軸線に近い中心側且つ前記ボデーの基端側に位置し、
前記締結部材の前記テーパ面は、前記第２領域において前記湾曲面に当接し、
前記締結部材の中心軸線は、前記先端部とは反対側の頭部が、前記先端部よりも前記ボデーの前記中心側且つ前記基端側に位置する向きに傾斜している、
刃先交換式切削工具。 A cutting edge exchangeable cutting tool comprising a body rotatable about an axis of rotation, a replaceable cutting insert attached to the body, and a fastening member for fixing the cutting insert to the body,
The tip portion of the fastening member is formed into a tapered taper surface,
The cutting insert has an upper surface and a lower surface each formed in a rectangle having a pair of long sides and a pair of short sides, and a side surface connecting the upper surface and the lower surface,
A cutting edge is formed at the intersecting ridge portion where the upper surface and the side surface intersect on the long side,
A bottomed recess is formed on the upper surface,
At least a part of the inner wall surface of the recess is a curved surface bulging toward the central axis of the recess,
A first virtual reference plane that includes the central axis of the recess and is parallel to the rotation axis of the body;
When the recess is divided into four regions by a second virtual reference plane that includes the central axis of the recess and is orthogonal to the rotation axis of the body,
The second region is located in the recess in the center side near the rotation axis of the body and on the base end side of the body,
The tapered surface of the fastening member contacts the curved surface in the second region,
The central axis of the fastening member is inclined such that the head portion on the side opposite to the tip portion is located closer to the center side and the base end side of the body than the tip portion is,
Interchangeable cutting edge cutting tool.
前記切削インサートの基端に最も近い前記凹部に挿入される第１の締結部材の中心軸線と前記第１仮想基準面とがなす角度は、前記切削インサートの先端に最も近い前記凹部に装入される第２の締結部材の中心軸線と前記第１仮想基準面とがなす角度よりも小さい、
請求項１に記載の刃先交換式切削工具。 A plurality of the recesses are formed on the upper surface of the cutting insert,
The angle formed by the central axis of the first fastening member and the first virtual reference plane, which is inserted into the recess closest to the base end of the cutting insert, is set in the recess closest to the tip of the cutting insert. Smaller than the angle formed by the central axis of the second fastening member and the first virtual reference plane,
The cutting edge exchangeable cutting tool according to claim 1.
請求項１又は２に記載の刃先交換式切削工具。 The cutting edge is a thread cutting edge,
The cutting edge exchangeable cutting tool according to claim 1.
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| US16/736,056 US11413696B2 (en) | 2019-01-17 | 2020-01-07 | Indexable cutting tool |
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| CN202010052742.4A CN111438409B (en) | 2019-01-17 | 2020-01-17 | Cutting tool with replaceable cutting insert |
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| WO2012043822A1 (en) * | 2010-09-30 | 2012-04-05 | 株式会社タンガロイ | Blade edge exchangeable cutting tool |
| JP2014524361A (en) * | 2011-08-22 | 2014-09-22 | イスカーリミテッド | Cutting tool and cutting insert having clamp holes with spaced clamps |
| JP2013056396A (en) * | 2011-09-08 | 2013-03-28 | Osg Corp | Indexable type thread milling cutter |
| WO2013051703A1 (en) * | 2011-10-07 | 2013-04-11 | 株式会社タンガロイ | Cutting tool with replaceable blade edge |
| WO2015129770A1 (en) * | 2014-02-26 | 2015-09-03 | 株式会社タンガロイ | Cutting insert, tool body, and cutting tool |
| WO2018034710A1 (en) * | 2016-08-16 | 2018-02-22 | Kennametal Inc. | Tool body for a shell end mill and cutting tool |
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| JP6892637B2 (en) | 2021-06-23 |
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