JP5185322B2 - Cutting tools - Google Patents

Cutting tools Download PDF

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JP5185322B2
JP5185322B2 JP2010120383A JP2010120383A JP5185322B2 JP 5185322 B2 JP5185322 B2 JP 5185322B2 JP 2010120383 A JP2010120383 A JP 2010120383A JP 2010120383 A JP2010120383 A JP 2010120383A JP 5185322 B2 JP5185322 B2 JP 5185322B2
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cutting insert
cutting
seat
circumferential direction
tool
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JP2011245585A (en
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勝也 中木原
敦彦 前田
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Sumitomo Electric Hardmetal Corp
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Description

この発明は、切削工具の交換式切れ刃として使用する基本形状が平面視円形のポジティブ型の切削インサート（以下では丸型切削インサートと言う）、詳しくは、所定角度の回転による切れ刃の割り出しがなされ、その割り出し点での固定の信頼性を高めた丸型切削インサートを用いた切削工具に関する。 The present invention relates to a positive type cutting insert (hereinafter referred to as a round type cutting insert) whose basic shape used as a replaceable cutting edge of a cutting tool is circular in plan view, and more specifically, the cutting edge is indexed by rotating at a predetermined angle. It made that relates to cutting tools with round cutting insert bets with improved fixation of reliability in its indexing point.

首記の丸型切削インサートの従来例として、例えば、下記特許文献１、２などに記載されたものがある。   As a conventional example of the round cutting insert mentioned above, for example, there are those described in Patent Documents 1 and 2 below.

特許文献１の切削インサートは、側面の一部を周方向に定ピッチで除去して作り出された基準平面を有する。その基準平面は、側面よりも傾きの大きな面にして側面の高さ方向途中から底面に至る部分に形成しており、インサートの取付け座に設けられる複数の異方向の座側面にそれぞれ隣り合う２つの基準平面を押し当てることで、切れ刃の割り出し（切れ刃の使用位置の入れ替え）と、割り出し点での回転の防止を行うようにしている。   The cutting insert of Patent Document 1 has a reference plane created by removing a part of the side surface at a constant pitch in the circumferential direction. The reference plane is formed in a portion extending from the middle in the height direction of the side surface to the bottom surface with a larger inclination than the side surface, and is adjacent to a plurality of different side seat surfaces provided on the mounting seat of the insert. By pressing two reference planes, the cutting edge is indexed (replacement of the use position of the cutting edge) and rotation at the indexing point is prevented.

また、特許文献２の切削インサートは、側面（周面）に、前記基準平面に相当する切欠面とニック溝を設け、周方向に一定数おきに配置された複数の切欠面を拘束面にしてその拘束面をインサート取付け座に対応させて設けた取付け座壁面に当接させ、それにより、切れ刃の割り出しと、割り出し点での回転の防止を行うようにしている。   Moreover, the cutting insert of patent document 2 provides the notch surface and nick groove which correspond to the said reference plane in the side surface (circumferential surface), and makes the several notch surface arrange | positioned in the circumferential direction every fixed number as a constraining surface. The restraining surface is brought into contact with a wall surface of the mounting seat provided in correspondence with the insert mounting seat, whereby the cutting edge is indexed and rotation at the indexing point is prevented.

そしてさらに、切削インサートが所定の姿勢にセットされたときにのみ、取付け座壁面に設けた突起と前記ニック溝の位置が対応して突起がニック溝に収容されるようにして切削インサートの誤装着が防止されるようにしている。   Further, only when the cutting insert is set in a predetermined posture, the cutting insert is mounted incorrectly so that the protrusion provided on the wall surface of the mounting seat corresponds to the position of the nick groove so that the protrusion is accommodated in the nick groove. Is to be prevented.

特開２００１−７９７０８号公報JP 2001-79708 A 特開２００７−２１００９０号公報JP 2007-210902 A

特許文献１の切削インサートは、彎曲した側面の一部を除去して側面に基準平面を生じさせる。そのために、基準平面の面積が制限され、インサートの拘束が面積の小さな基準平面によってなされるものになっており、工具本体（カッタボディやホルダ）による固定の信頼性、特に、インサートの回転防止の信頼性が十分でない。   The cutting insert of patent document 1 removes a part of the curved side surface, and produces a reference plane on the side surface. For this reason, the area of the reference plane is limited, and the insert is constrained by a reference plane with a small area. The reliability of fixing by the tool body (cutter body or holder), in particular, prevention of rotation of the insert Reliability is not enough.

特許文献２の切削インサートも、取付け座壁面の突起が側面のニック溝に収容されるが、ニック溝による突起収容部はインサートの回転防止に寄与するものではなく、割り出しと回転防止のための拘束が側面に設けた切欠面に依存してなされることから、特許文献１の切削インサートと同様に、回転防止の信頼性が十分でない。   Also in the cutting insert of Patent Document 2, the protrusion on the wall surface of the mounting seat is accommodated in the nick groove on the side surface, but the protrusion accommodating portion by the nick groove does not contribute to prevention of rotation of the insert, and is a constraint for indexing and prevention of rotation. Therefore, the reliability of rotation prevention is not sufficient as in the cutting insert of Patent Document 1.

なお、特許文献２の切削インサートは、取付け座壁面の突起を側面のニック溝に適合して嵌る形状にすれば、両者の係合部を利用して回転防止の信頼性を高めることができる。しかしながら、この方法では、ニック溝に対応した形状の突起を工具本体に設ける必要があるため、工具本体の加工が煩雑になる。また、工具の使用に伴う突起の損傷が避けられず、その損傷が起こったときに、工具本体を交換することになって経済的なロスが発生する。   In addition, if the cutting insert of patent document 2 is made into the shape which fits the protrusion of a mounting seat wall surface to the nick groove of a side surface, it can improve the reliability of rotation prevention using both engaging parts. However, in this method, since it is necessary to provide a protrusion having a shape corresponding to the nick groove on the tool body, processing of the tool body becomes complicated. In addition, damage to the protrusions associated with the use of the tool is unavoidable, and when the damage occurs, the tool body is replaced, resulting in an economic loss.

この発明は、工具本体の加工の煩雑化や耐久性の低下を招かずにポジティブ丸型切削インサートの取付け座に対する固定の信頼性を高めることを課題としている。   This invention makes it a subject to raise the reliability of fixation with respect to the attachment seat of a positive circular cutting insert, without causing complication of a process of a tool main part, and a fall of durability.

上記の課題を解決するため、この発明においては、ポジティブ丸型切削インサートを用いた切削工具を提供する。 To solve the above problems, in this invention, there is provided a cutting tool with a positive round cutting insert and.

この発明で用いるポジティブ丸型切削インサートは、上面に対して鋭角に交差して交差部に円を基本形にした切れ刃を生じさせる切頭円錐状（倒立切頭円錐状）の彎曲した側面を有し、その彎曲した側面に、当該側面の高さ方向途中から底面に至る平面の割り出し面が周方向に定ピッチで複数設けられ、その割り出し面は傾斜角が前記彎曲した側面の傾斜角よりも大きく、その割り出し面の周方向中央部に、縦長の凸部が設けられて前記割り出し面が周方向に２分された構造を有する。 The positive round cutting insert used in the present invention has a truncated conical (inverted truncated conical) curved side surface that intersects at an acute angle with respect to the upper surface and generates a circular cutting edge at the intersection. The curved side surface is provided with a plurality of flat index surfaces at a constant pitch in the circumferential direction from the middle of the side surface in the height direction to the bottom surface, and the index surface has an inclination angle larger than the tilt angle of the curved side surface. It is large and has a structure in which a vertically long convex portion is provided at the center in the circumferential direction of the indexing surface and the indexing surface is divided into two in the circumferential direction.

側面には、周方向に定ピッチでニック溝が形成されていてもよく、そのニック溝と重ならない位置に前記凸部が配置される。   On the side surface, nick grooves may be formed at a constant pitch in the circumferential direction, and the convex portions are arranged at positions that do not overlap the nick grooves.

この切削インサートは、切れ刃の割り出し数を４に設定したものが好ましく、その切削インサートは、工具本体の取付け座に９０°方向を異ならせた２つの座側面を形成し、その２つの座側面で隣り合う割り出し面を拘束することができる。   The cutting insert preferably has a cutting blade index number set to 4, and the cutting insert forms two seating sides with different 90 ° directions on the mounting seat of the tool body, and the two seating side surfaces. The adjacent indexing surfaces can be constrained with.

切れ刃の割り出し数（前記凸部とその凸部によって周方向に２分された割り出し面の総数）は３にすることもできるし、４以上に増加させることもできる。   The index number of the cutting edge (the total number of index surfaces divided into two in the circumferential direction by the convex portion and the convex portion) can be set to 3, or can be increased to 4 or more.

この発明の切削工具は、座底面と、各々が所定の角度で傾斜した複数の座側面と、各座側面の一部を窪ませて構成される凹部を備え、前記凹部が前記切削インサートの側面の凸部に対応させてその凸部を適合して受け入れるように構成された取付け座を工具本体に設け、
上面がすくい面、側面が逃げ面となる姿勢にした切削インサートの底面を前記取付け座の座底面で支え、前記凹部に前記凸部を係合させて前記複数の座側面に切削インサートの異なる位置の割り出し面をそれぞれ押し当て、この状態でクランプねじなどのクランプ手段で切削インサートを工具本体に固定するようにしている。 The cutting tool of the present invention includes a seat bottom surface, a plurality of seat side surfaces each inclined at a predetermined angle, and a recess formed by recessing a part of each seat side surface, and the recess is a side surface of the cutting insert. The tool body is provided with a mounting seat configured to fit and accept the convex portion corresponding to the convex portion of
The bottom surface of the cutting insert in a posture in which the top surface is a rake surface and the side surface is a flank surface is supported by the seat bottom surface of the mounting seat, and the projections are engaged with the recesses, so that the cutting inserts have different positions on the plurality of seat side surfaces In this state, the cutting insert is fixed to the tool body by a clamping means such as a clamping screw.

この切削工具の具体例として、例えば、フライスカッタが考えられる。そのフライスカッタは、工具本体（カッタボディ）の先端外周に周方向に所定の間隔をあけて取付け座を複数形成し、各取付け座にこの発明の切削インサートを装着して構成される。また、他の具体例としてバイトも考えられる。そのバイトは工具本体（ホルダ）の先端に取付け座を形成し、その取付け座にこの発明の切削インサートを装着して構成される。   As a specific example of this cutting tool, for example, a milling cutter can be considered. The milling cutter is formed by forming a plurality of mounting seats on the outer periphery of the tip of the tool body (cutter body) at predetermined intervals in the circumferential direction, and mounting the cutting insert of the present invention on each mounting seat. Another example is a byte. The cutting tool is formed by forming a mounting seat at the tip of a tool body (holder) and mounting the cutting insert of the present invention on the mounting seat.

工具本体に対する切削インサートの固定は、フライスカッタについては、切削インサートの上面の中央に底面に向けて貫通する取付け孔を設け、その取付け孔にクランプねじを通し、そのクランプねじを取付け座の座底面に開口させて工具本体に設けたねじ孔にねじ込む構造が適している。   For the milling cutter, the cutting insert is fixed to the tool body by providing a mounting hole that penetrates toward the bottom surface in the center of the top surface of the cutting insert, passing a clamp screw through the mounting hole, and inserting the clamp screw into the seat bottom of the mounting seat. A structure in which the screw is opened and screwed into a screw hole provided in the tool body is suitable.

適用対象がバイトの場合には、クランプねじによる固定のほかに、クランプ駒でクランプすることも考えられ、その場合には、切削インサートは、取付け孔のないものでよい。   When the application target is a cutting tool, in addition to fixing with a clamp screw, clamping with a clamp piece is also conceivable. In that case, the cutting insert may have no mounting hole.

なお、切れ刃の割り出し数は、切削インサートの大きさにもよるが、８以上は可能と思われる。その割り出し数を５以上にしたものは、取付け座に座側面を３つ以上形成して切削インサートの拘束を３あるいはそれ以上の箇所で行うことができる。   It should be noted that although the number of cutting blades indexed depends on the size of the cutting insert, 8 or more is considered possible. When the index number is 5 or more, three or more seating side surfaces can be formed on the mounting seat, and the cutting insert can be restrained at three or more locations.

この発明の切削工具に用いる切削インサートは、側面に設けた平面の割り出し面を取付け座に設けられる複数の向きの異なった座側面で拘束する。そして同時に、前記割り出し面を２分する位置に設けた凸部を座側面に形成された凹部に入り込ませてその凹部に係合させる。 In the cutting insert used in the cutting tool of the present invention, the flat indexing surface provided on the side surface is constrained by a plurality of seating side surfaces having different orientations provided on the mounting seat. At the same time, a convex portion provided at a position that bisects the indexing surface enters a concave portion formed on the seat side surface and engages with the concave portion.

これにより、切削インサートの回転防止が主として凸部と凹部の係合部によってなされ、特許文献１の基準平面（本願の割り出し面）のみを拘束する構造に比べて回転の防止が正確になってインサート固定の信頼性が高まる。   Accordingly, the rotation of the cutting insert is mainly prevented by the engaging portion of the convex portion and the concave portion, and the prevention of the rotation is more accurate than the structure in which only the reference plane (indexed surface of the present application) of Patent Document 1 is constrained. Fixing reliability is increased.

また、特許文献２と違って、回転防止用の凸部が切削インサートに形成されているので、凸部の損傷に起因した工具本体の寿命低下が起こらず、工具本体の長期使用が可能になって経済ロスも抑制される。   Further, unlike Patent Document 2, since the convex portion for preventing rotation is formed on the cutting insert, the tool body is not shortened due to damage to the convex portion, and the tool body can be used for a long time. Economic losses are also suppressed.

なお、切れ刃の割り出し数を４にして、前記凸部とその凸部によって周方向に２分された割り出し面を周方向の等分点（回転の割り出し角が９０°の位置）に設けた切削インサートは、工具本体に設ける取付け座の加工、前記凸部の高さの確保、前記割り出し面の面積の確保が容易になる。   In addition, the index number of the cutting edge was set to 4, and the index part which was divided into two in the circumferential direction by the convex part and the convex part was provided at the equally dividing point (position where the index angle of rotation is 90 °). The cutting insert facilitates processing of a mounting seat provided in the tool body, ensuring the height of the convex portion, and ensuring the area of the index surface.

この発明の工具に用いる切削インサートの一例を示す斜視図The perspective view which shows an example of the cutting insert used for the tool of this invention 図１の切削インサートを底面側から見た斜視図The perspective view which looked at the cutting insert of FIG. 1 from the bottom face side 図１の切削インサートの側面図Side view of the cutting insert of FIG. 図１の切削インサートの平面図Plan view of the cutting insert of FIG. 図１の切削インサートの底面図Bottom view of the cutting insert of FIG. この発明の切削工具の一例を示す側面図Side view showing an example of the cutting tool of the present invention 図６の切削工具の正面図Front view of the cutting tool of FIG. 図６の切削工具の工具本体に設けられた取付け座の斜視図The perspective view of the mounting seat provided in the tool main body of the cutting tool of FIG. 切削インサートを取付け座に装着した状態の断面図Sectional view of the cutting insert mounted on the mounting seat 図９のＸ−Ｘ線に沿った位置の断面図Sectional drawing of the position along the XX line of FIG.

以下、添付図面の図１〜図１０に基づいて、この発明の切削工具の実施の形態を説明する。 Hereinafter, with reference to FIGS. 1 to 10 of the accompanying drawings, an embodiment of the switching cutting tool of the present invention.

図１〜図５は、回転の割り出し角を９０°に設定したポジティブ丸型切削インサートを示している。この切削インサート１は、平行配置の上面２と底面３、上面２に対して鋭角に交差して交差部に切れ刃４を生じさせる一方向に彎曲した側面５を有する。また、上面２の中央に底面３に向けて貫通する取付け孔６を有する。上面２は平面視円形をなし、側面５は、倒立切頭円錐状をなす。   1 to 5 show a positive circular cutting insert in which the index angle of rotation is set to 90 °. The cutting insert 1 has a parallel arrangement of an upper surface 2 and a bottom surface 3, and a side surface 5 bent in one direction that intersects the upper surface 2 at an acute angle and generates a cutting edge 4 at the intersection. In addition, a mounting hole 6 that penetrates toward the bottom surface 3 is provided at the center of the top surface 2. The upper surface 2 has a circular shape in plan view, and the side surface 5 has an inverted truncated conical shape.

これにより、上面２と側面５の交差稜で形成される切れ刃４は平面視円形又は円を基本形状にしたものになる。ここでいう「円を基本形状にした」の意味は、側面５に周方向に定ピッチでニック溝を形成した丸型切削インサートの場合、切れ刃４の平面視形状が波打つ円になり、そのような形状を指す。   Thereby, the cutting edge 4 formed by the crossing ridge of the upper surface 2 and the side surface 5 has a circular shape or a basic shape in plan view. In this case, in the case of a round cutting insert in which nick grooves are formed at a constant pitch in the circumferential direction on the side surface 5, the meaning of “the circle has a basic shape” is a circular shape in which the shape of the cutting edge 4 is viewed in plan view, It refers to such a shape.

この切削インサート１は、さらに、側面５の途中に平面の割り出し面７とその割り出し面７を周方向に２分する凸部８を有する。割り出し面７は、周方向に定ピッチで複数設けられている。例示の切削インサート１は、割り出し角が９０°であるので、割り出し面７が９０°ピッチで計４面設けられている。 The cutting insert 1 further has a flat indexing surface 7 in the middle of the side surface 5 and a convex portion 8 that divides the indexing surface 7 into two in the circumferential direction. A plurality of index surfaces 7 are provided at a constant pitch in the circumferential direction. Since the illustrated cutting insert 1 has an index angle of 90 °, a total of four index surfaces 7 are provided at a pitch of 90 °.

この割り出し面７は、図３に示したその面の傾斜角θ１が彎曲した側面５の傾斜角θ２よりも大きい。また、この割り出し面７は、側面５の高さ方向途中から底面３に至る位置に設けられている。そして、その割り出し面７の周方向中央部に、当該割り出し面７を周方向に２分する縦長の凸部８が設けられている。   The index surface 7 has an inclination angle θ 1 of the surface shown in FIG. 3 larger than the inclination angle θ 2 of the curved side surface 5. The index surface 7 is provided at a position from the middle of the side surface 5 in the height direction to the bottom surface 3. A vertically long convex portion 8 that divides the index surface 7 into two in the circumferential direction is provided at the center in the circumferential direction of the index surface 7.

凸部８は、彎曲した側面５を割り出し面７の周方向中央部に残存させてその彎曲した側面５で突端の面８ａを形成しており、この構造は、凸部８の高さ寸法（＝径方向突出量）を最大限に確保できて好ましい。ただし、突端の面８ａが彎曲した側面５よりも内側に配置される凸部でも固定の信頼性向上の目的は達成される。   The convex portion 8 has the curved side surface 5 left in the central portion in the circumferential direction of the indexing surface 7 to form a protruding end surface 8a with the curved side surface 5, and this structure has a height dimension ( = Amount of radial protrusion) is preferable because the maximum amount can be secured. However, the object of improving the fixing reliability can be achieved even with the convex portion disposed on the inner side of the curved side surface 5 of the protruding end surface 8a.

なお、例示の切削インサート１は、底面３と側面５が交差した部位のエッジと凸部８の底面側のエッジに強化用の面取り部９を設けているが、これは、必要に応じて設ければよく、必須ではない。   In addition, although the illustrated cutting insert 1 is provided with the chamfered portion 9 for reinforcement at the edge of the portion where the bottom surface 3 and the side surface 5 intersect and the edge on the bottom surface side of the convex portion 8, this is provided as necessary. What is necessary is not necessary.

また、切削インサート１の上面２は、ブレーカ溝やブレーカ突起が形成された面であっても構わない。   Further, the upper surface 2 of the cutting insert 1 may be a surface on which breaker grooves and breaker protrusions are formed.

次に、例示の切削インサートを採用した切削工具の具体例を図６〜図１０に示す。例示の切削工具１０は、フライスカッタである。このフライスカッタは、工具本体（カッタボディ）１１の外周に、切屑ポケット１２とそれぞれの切屑ポケットに臨む取付け座１３を周方向に所定の間隔をあけて複数設け、各取付け座１３に、先に説明した切削インサート１を装着して構成されている。   Next, specific examples of cutting tools employing the exemplified cutting insert are shown in FIGS. The exemplary cutting tool 10 is a milling cutter. This milling cutter is provided with a plurality of mounting seats 13 facing the chip pockets 12 and the respective chip pockets at predetermined intervals in the circumferential direction on the outer periphery of the tool body (cutter body) 11. The cutting insert 1 described is mounted.

取付け座１３は、工具本体１１の先端外周に形成されている。図８〜図１０に詳細を示したその取付け座１３は、座底面１４と、各々が所定の角度で傾斜した２つの互いの向きが９０°異なる座側面１５、１５と、各座側面の一部を窪ませて構成される凹部１６と、切削インサートの彎曲した側面５の干渉を避ける逃げ部１７を備えたものになっている。   The mounting seat 13 is formed on the outer periphery of the tip of the tool body 11. The mounting seat 13 shown in detail in FIGS. 8 to 10 includes a seat bottom 14, two seat sides 15, 15 each inclined at a predetermined angle and differing from each other by 90 °, and one seat side. It is provided with the recessed part 16 comprised by denting a part, and the escape part 17 which avoids interference of the curved side surface 5 of the cutting insert.

凹部１６は、上端が開放した縦長の凹部にしており、切削インサートの凸部８が適合して嵌り込む幅を有する。   The concave portion 16 is a vertically long concave portion having an open upper end, and has a width in which the convex portion 8 of the cutting insert fits.

このように構成した工具本体１１の取付け座１３に、割り出し角が９０°に設定された切削インサート１を着座させる。このとき、切削インサート１は、上面２がすくい面、側面５が逃げ面となる姿勢にし、底面３を座底面１４で支える。また、図９、図１０に示すように、２箇所の取付け座１３の各凹部１６に凸部８を入り込ませ、この状態で切削インサート１の隣り合う位置の割り出し面７を、２箇所の取付け座の座側面１５にそれぞれ当接させる。   The cutting insert 1 whose index angle is set to 90 ° is seated on the mounting seat 13 of the tool body 11 configured as described above. At this time, the cutting insert 1 is in such a posture that the upper surface 2 is a rake surface and the side surface 5 is a flank surface, and the bottom surface 3 is supported by the seat bottom surface 14. Further, as shown in FIGS. 9 and 10, the convex portions 8 are inserted into the concave portions 16 of the two mounting seats 13, and in this state, the indexing surface 7 at the adjacent position of the cutting insert 1 is mounted at two locations. It is made to contact | abut to the seat side 15 of a seat, respectively.

そして、取付け孔６にクランプねじ１８を通し、そのクランプねじ１８を、座底面１４に開口させて工具本体１１に形成されたねじ孔１９にねじ込み、押圧力が働くところまで締め付けて切削インサート１を工具本体１１に固定する。   Then, the clamp screw 18 is passed through the mounting hole 6, the clamp screw 18 is opened to the seat bottom 14, screwed into the screw hole 19 formed in the tool body 11, and tightened until the pressing force is applied, and the cutting insert 1 is tightened. Fix to the tool body 11.

なお、凹部１６の底面１６ａは、凸部８の突端の面８ａに押圧力が働くように、面８ａがテーパ嵌合する斜面にしている。これは好ましい構成であり、このようにすることで、クランプねじ１８を締め付ける際に前記凸部８の突端の面８ａが凹部１６の底面に押し付けられて切削インサートのがたつきが確実に阻止されるようになる。   In addition, the bottom surface 16a of the concave portion 16 is a slope on which the surface 8a is taper-fitted so that a pressing force acts on the surface 8a of the protruding end of the convex portion 8. This is a preferable configuration, and by doing so, when the clamp screw 18 is tightened, the protruding end surface 8a is pressed against the bottom surface of the recessed portion 16 to reliably prevent rattling of the cutting insert. Become so.

以上の説明は、割り出し数（割り出し面７と凸部８の数）を４に設定した切削インサートとそれを使用した刃数が５のフライスカッタを例に挙げて行ったが、この発明の適用対象は、割り出し数が３や４以上の切削インサートであってもよい。   In the above description, the cutting insert in which the number of indexes (number of index surfaces 7 and convex portions 8) is set to 4 and the milling cutter having 5 blades using the cutting insert are taken as an example. The target may be a cutting insert having an index number of 3 or 4 or more.

割り出し数を５あるいはそれより多くした切削インサートは、取付け座に向きの異なる座側面を３つ以上形成し、各座側面に異なる位置の割り出し面をそれぞれ当接させて切削インサートを拘束することができる。   Cutting inserts with an index number of 5 or more can constrain the cutting insert by forming three or more seat side surfaces with different orientations on the mounting seat, and contacting each seat side surface with index surfaces at different positions. it can.

この発明の切削工具は、彎曲した側面に周方向に定ピッチでニック溝を設けて切れ刃を波打った刃にしたニック溝付き切削インサートも利用することができる。 The cutting tool of the present invention can also use a cutting insert with a nick groove in which a nick groove is provided at a constant pitch in the circumferential direction on a curved side surface, and the cutting edge is waved.

さらに、この発明の切削工具は、旋削用のバイトであってもよい。そのバイトは、工具本体（ホルダ）の先端に取付け座を設けてそこにこの発明の切削インサートを装着する。この場合の切削インサートの固定は、既に述べたように、クランプねじのほかにクランプ駒による固定も可能である。   Further, the cutting tool of the present invention may be a turning tool. The cutting tool is provided with a mounting seat at the tip of the tool body (holder), and the cutting insert of the present invention is mounted thereon. In this case, as described above, the cutting insert can be fixed by a clamp piece in addition to the clamp screw.

１ 切削インサート
２ 上面
３ 底面
４ 切れ刃
５ 側面
６ 取付け孔
７ 割り出し面
８ 凸部
８ａ 突端の面
９ 面取り部
θ１ 割り出し面の傾斜角
θ２ 側面の傾斜角
１０ 切削工具
１１ 工具本体
１２ 切屑ポケット
１３ 取付け座
１４ 座底面
１５ 座側面
１６ 凹部
１６ａ 凹部の底面
１７ 逃げ部
１８ クランプねじ
１９ ねじ孔 DESCRIPTION OF SYMBOLS 1 Cutting insert 2 Upper surface 3 Bottom surface 4 Cutting edge 5 Side surface 6 Mounting hole 7 Indexing surface 8 Protruding part 8a Protruding surface 9 Chamfering surface θ1 Indexing surface inclination angle θ2 Side surface inclination angle 10 Cutting tool 11 Tool body 12 Chip pocket 13 Installation Seat 14 Seat bottom 15 Seat side 16 Recess 16a Recess bottom 17 Escape 18 Clamp screw 19 Screw hole

Claims (2)

上面（２）に対して鋭角に交差して交差部に円を基本形にした切れ刃（４）を生じさせる切頭円錐状の彎曲した側面（５）を有し、その彎曲した側面（５）に、当該側面の高さ方向途中から底面（３）に至る平面の割り出し面（７）が周方向に定ピッチで複数設けられ、その割り出し面（７）は、傾斜角（θ１）が前記彎曲した側面（５）の傾斜角（θ２）よりも大きく、その割り出し面（７）の周方向中央部に、縦長の凸部（８）が設けられて前記割り出し面（７）が周方向に２分された構造を有する切削インサート（１）と、
座底面（１４）と、各々が所定の角度で傾斜した複数の座側面（１５）と、各座側面（１５）の一部を窪ませて構成される凹部（１６）を備え、前記凹部（１６）が前記切削インサート（１）の側面の凸部（８）に対応させてその凸部（８）を適合して受け入れるように構成された取付け座（１３）を設けた工具本体（１１）を具備し、
上面（２）がすくい面、側面（５）が逃げ面となる姿勢にした前記切削インサート（１）の底面（３）を前記取付け座の座底面（１４）で支え、前記凹部（１６）に前記凸部（８）を係合させて前記複数の座側面（１５）に前記切削インサート（１）の異なる位置の割り出し面（７）をそれぞれ押し当て、この状態でクランプねじなどのクランプ手段で前記切削インサート（１）を工具本体（１１）に固定するようにした切削工具。 It has a frustoconical curved side surface (5) that intersects at an acute angle with respect to the upper surface (2) and produces a cutting edge (4) having a basic circle shape at the intersection, and the curved side surface (5) In addition, a plurality of flat indexing surfaces (7) from the middle of the side surface in the height direction to the bottom surface (3) are provided at a constant pitch in the circumferential direction, and the indexing surface (7) has an inclination angle (θ1) of the curvature. The side surface (5) is larger than the inclination angle (θ2), and a vertically long convex portion (8) is provided at the center in the circumferential direction of the index surface (7) so that the index surface (7) is 2 in the circumferential direction. A cutting insert (1) having a divided structure ;
A seat bottom surface (14), a plurality of seat side surfaces (15) each inclined at a predetermined angle, and a recess (16) configured by recessing a part of each seat side surface (15), 16) A tool body (11) provided with a mounting seat (13) adapted to receive the projection (8) in conformity with the projection (8) on the side surface of the cutting insert (1). Comprising
The bottom surface (3) of the cutting insert (1) in such a posture that the upper surface (2) is a rake face and the side surface (5) is a flank surface is supported by the seat bottom surface (14) of the mounting seat, and is formed in the recess (16). The projections (8) are engaged, and the indexing surfaces (7) at different positions of the cutting insert (1) are pressed against the plurality of seat side surfaces (15), and in this state, clamping means such as a clamping screw are used. A cutting tool in which the cutting insert (1) is fixed to a tool body (11). 前記切削インサート（１）として、前記側面（５）に、周方向に定ピッチでニック溝が形成され、前記切れ刃（４）が波打った刃になっているものを設けた請求項１に記載の切削工具。 As the cutting insert (1), wherein the side surface (5), nicks at a constant pitch is formed in the circumferential direction, to claim 1, wherein the cutting edge (4) is provided what has become the wavy blade The described cutting tool.
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US8882402B2 (en) * 2011-11-22 2014-11-11 Kennametal Inc. Anti-rotation mounting mechanism for a round insert
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