JP2013121638A - Vertical indexable cutting insert and milling cutter - Google Patents

Vertical indexable cutting insert and milling cutter Download PDF

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JP2013121638A
JP2013121638A JP2011271297A JP2011271297A JP2013121638A JP 2013121638 A JP2013121638 A JP 2013121638A JP 2011271297 A JP2011271297 A JP 2011271297A JP 2011271297 A JP2011271297 A JP 2011271297A JP 2013121638 A JP2013121638 A JP 2013121638A
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cutting edge
face
cutting
insert
main
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JP5779831B2 (en
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Atsuhiko Maeda
敦彦 前田
Hiroki Matsubara
弘樹 松原
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Sumitomo Electric Hardmetal Corp
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Sumitomo Electric Hardmetal Corp
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Abstract

PROBLEM TO BE SOLVED: To maintain the favorable surface roughness of a vertical cutting insert for milling even if a use condition such as tool feed is raised and flanks of sub-cutting edges are damaged.SOLUTION: The vertical indexable cutting insert uses side faces 4 as rake faces, long sides of the side faces as main cutting edges 6, upper faces 2 or lower faces 3 as flanks of the main cutting edges, short sides of the side faces 4 as sub-cutting edges 7, and a part of each side face 5 as the flank of the sub-cutting edge. The vertical indexable cutting insert is constituted so that the short sides of the side faces 4 are bilaterally asymmetric, and a part of each short side is used as the sub-cutting edge 7. The sub-cutting edges 7 are protruded to the length direction of the main cutting edge from a part remaining at the short side in a side-face view of the insert, and continued to tips of the main cutting edges 6 via a nose R part 8 of a bending radius R1, and the center between the two side faces 4, 4 in a parallel arrangement of the end faces 5 is formed of a flat first face which is located in a position lower than the sub-cutting edges 7.

Description

この発明は、フライス加工用の刃先交換式切削インサート、特に、側面をすくい面として使用するいわゆる縦型の刃先交換式切削インサートとそれを用いたフライスカッタに関する。   The present invention relates to a cutting edge exchangeable cutting insert for milling, and more particularly to a so-called vertical cutting edge exchangeable cutting insert using a side surface as a rake face and a milling cutter using the same.

フライス加工用の縦型刃先交換式切削インサート（以下では単に切削インサートと言う）として、例えば、下記特許文献１〜３に開示されたものが知られている。   As a vertical cutting edge exchangeable cutting insert for milling (hereinafter simply referred to as a cutting insert), for example, those disclosed in Patent Documents 1 to 3 below are known.

特許文献１に記載された切削インサートや特許文献２の図１、図２の切削インサートは、１８０°の回転で使用済み切れ刃と未使用刃を入れ替えられるようにしたものであって、すくい面となす側面の短辺部に、短辺を２等分した長さで、なおかつ、主切れ刃となす側面の対向位置の長辺に対してそれぞれが同一角度で傾く副切れ刃を左右対称に設けている。   The cutting insert described in Patent Document 1 and the cutting inserts in FIGS. 1 and 2 of Patent Document 2 are designed to replace a used cutting edge and an unused blade by rotation of 180 °. The sub-cutting blades that have a length that bisects the short side at the short side portion of the side surface that is the same, and that are inclined at the same angle with respect to the long side of the opposing position of the side surface that forms the main cutting edge, are symmetrical Provided.

また、主切れ刃と副切れ刃との間に形成される主切れ刃先端のノーズＲと主切れ刃後端のノーズＲを同サイズにしている。   Further, the nose R at the front end of the main cutting edge and the nose R at the rear end of the main cutting edge formed between the main cutting edge and the sub cutting edge are made the same size.

一方、特許文献３の切削インサートは、短辺の全域を副切れ刃として使用できるようにしている（実質は主切れ刃側の一部が副切れ刃として使用される）。また、特許文献１，２の切削インサートと同様に、主切れ刃と副切れ刃との間に形成される主切れ刃先端のノーズＲと主切れ刃後端のノーズＲを同サイズにしている。   On the other hand, the cutting insert of Patent Document 3 is configured so that the entire short side can be used as a secondary cutting edge (substantially, a part on the main cutting edge side is used as a secondary cutting edge). Further, similarly to the cutting inserts of Patent Documents 1 and 2, the nose R at the front end of the main cutting edge and the nose R at the rear end of the main cutting edge formed between the main cutting edge and the sub cutting edge are made the same size. .

特表２００５−５２８２３０号公報JP-T-2005-528230 特許第４４９１４０４号公報Japanese Patent No. 4491404 特表２００７−５２０３６０号公報Special table 2007-520360 gazette

特許文献１，２の切削インサートは、側面の短辺の半分を副切れ刃として使用するので、副切れ刃の長さが制限される。また、２等分した短辺を相反する向きに同一角度傾斜させているので、主切れ刃とのなす角度も制限され、工具の送りが一定値を超えるなど、一定の条件を越えて使用したときに加工面の面粗さが著しく劣化する問題があった。   Since the cutting inserts of Patent Documents 1 and 2 use half of the short side of the side surface as the secondary cutting edge, the length of the secondary cutting edge is limited. In addition, because the short sides divided in half are inclined at the same angle in opposite directions, the angle formed with the main cutting edge is limited, and the tool feed exceeds a certain value, such as exceeding a certain value. There was a problem that the surface roughness of the processed surface deteriorated sometimes.

また、特許文献３の切削インサートは、短辺の全長をサラエ加工用の副切れ刃として利用できるが、副切れ刃のフェース角を小さくして加工面の面粗さを向上させると、主切れ刃と副切れ刃に加工される面の直角度を確保できず、その直角度を維持すると加工面の面粗さが低下すると言う問題があり、直角度の確保の観点から面粗さの向上は実質的に不可能であった。   The cutting insert of Patent Document 3 can use the entire length of the short side as a secondary cutting edge for Sarae processing. However, if the face angle of the secondary cutting edge is reduced to improve the surface roughness of the processing surface, There is a problem that the perpendicularity of the surface processed by the blade and the sub-cutting blade cannot be secured, and there is a problem that the surface roughness of the machined surface decreases if the perpendicularity is maintained. Was virtually impossible.

また、主切れ刃先端のノーズＲの大きさは、加工されるワークのサイズや形状に依存し、ユーザのニーズによって決まる。このために、従来の切削インサートは、主切れ刃後端のノーズＲも主切れ刃先端のノーズＲに制約を受けて曲げ半径の大きなノーズＲとなる。   The size of the nose R at the tip of the main cutting edge depends on the size and shape of the workpiece to be processed and is determined by the needs of the user. For this reason, in the conventional cutting insert, the nose R at the rear end of the main cutting edge is also restricted by the nose R at the front end of the main cutting edge and becomes a nose R having a large bending radius.

これにより、隅削りフライスカッタで掘り込み加工などを行ったときに主切れ刃に加工された面の刃形の継ぎ目の段差（いわゆる送りマークの波の高さ）が大きくなる不具合もあった。   As a result, there has been a problem that the level difference (so-called wave height of the feed mark) of the blade-shaped seam of the surface machined into the main cutting edge becomes large when performing digging with a corner milling cutter.

さらに、切削に関与しない側の端面は、カッタボディに対する軸方向の位置決めに利用されるが、その端面のカッタボディに形成された座溝の座側面に支えられる部分の面積が副切れ刃の長さの変動に伴って増減することから、カッタボディによるインサートの支持が不十分になる懸念もあった。   Furthermore, the end face on the side not involved in cutting is used for axial positioning with respect to the cutter body, but the area of the end face supported by the seat side surface of the seat groove formed in the cutter body is the length of the secondary cutting edge. There is also a concern that the support of the insert by the cutter body becomes insufficient because it increases and decreases with the variation of the length.

特に、副切れ刃の損傷が大きいと、副切れ刃の逃げ面もダメージを受けるため、切れ刃のローテーション（使用済みの刃と未使用刃の入れ替え）を行ったとときにダメージを受けている端面が軸方向の位置決めに利用されることになって支持安定性が損なわれることがあり、これ等のことも、加工面の面粗さを低下させる原因になっていた。   In particular, if the damage to the secondary cutting edge is large, the flank face of the secondary cutting edge will also be damaged, so the end face that is damaged when the cutting edge is rotated (replaced used blade and unused blade). Is used for positioning in the axial direction, and the support stability may be impaired. These also cause the surface roughness of the processed surface to be reduced.

この発明は、フライス加工用の縦型の切削インサートを、工具送りなどの使用条件が高められたり、副切れ刃の逃げ面がダメージを受けたりしても良好な面粗さを維持できるものにすることを課題としている。   This invention makes it possible to maintain a good surface roughness even if the vertical cutting insert for milling is used under conditions such as tool feeding or the flank of the secondary cutting edge is damaged. The challenge is to do.

上記の課題を解決するため、この発明においては、縦長の側面をすくい面、側面の長辺を主切れ刃、上下面を主切れ刃の逃げ面、側面の短辺を副切れ刃（サラエ刃）、端面の一部を副切れ刃の逃げ面として使用する縦型刃先交換式切削インサートを、
前記側面の短辺が左右非対称をなし、その短辺の一部が前記副切れ刃として構成され、その副切れ刃が、インサートの側面視において短辺の残りの一部よりも主切れ刃の長さ方向に突出して主切れ刃の先端に曲げ半径Ｒ１のノーズＲ部を介して連なり、
平行配置の２側面間に位置する前記端面の中央部が前記副切れ刃よりも低い位置にあって平坦な第１の面で構成されたものにした。 In order to solve the above-mentioned problems, in the present invention, the longitudinal side face is a rake face, the long side of the side face is a main cutting edge, the upper and lower faces are flank faces of the main cutting edge, and the short side face is a secondary cutting edge (Sarae blade). ), A vertical cutting edge replaceable cutting insert that uses a part of the end face as a flank for the secondary cutting edge.
The short side of the side surface is asymmetrical, and a part of the short side is configured as the secondary cutting edge, and the secondary cutting edge is more of the main cutting edge than the remaining part of the short side in a side view of the insert. Protruding in the length direction and connected to the tip of the main cutting edge via a nose R portion with a bending radius R1,
The center part of the end face located between two side faces arranged in parallel was located at a position lower than the auxiliary cutting edge and was constituted by a flat first face.

この切削インサートは、少なくとも端面の中央部の前記第１の面を座溝の座側面に支えられる被支持面となしてカッタボディに対する軸方向の位置決めを行う。   This cutting insert performs axial positioning with respect to the cutter body by using at least the first surface at the center of the end surface as a supported surface supported by the seat side surface of the seat groove.

前記端面の、副切れ刃の逃げ面として利用されない部分は、前記第１の面と同一高さレベルの平面にすることで座溝の前記被支持面の一部として使用することができる。   The portion of the end face that is not used as the flank of the auxiliary cutting edge can be used as a part of the supported surface of the seat groove by making it a flat surface having the same height as the first surface.

前記副切れ刃の刃幅ｔは、インサート厚みＴの１／３〜２／３程度、主切れ刃と副切れ刃との間に形成されるコーナ部のコーナ角θは、８５°〜１４０°（８５°≦θ≦１４０°）の範囲が適当である。   The edge width t of the secondary cutting edge is about 1/3 to 2/3 of the insert thickness T, and the corner angle θ of the corner portion formed between the main cutting edge and the secondary cutting edge is 85 ° to 140 °. A range of (85 ° ≦ θ ≦ 140 °) is appropriate.

副切れ刃は、直線刃、円弧刃のどちらであってもよく、円弧刃の場合の円弧の半径は、２００〜１０００ｍｍ程度が適当である。   The secondary cutting edge may be either a straight edge or an arc edge, and the radius of the arc in the case of the arc edge is suitably about 200 to 1000 mm.

また、側面の短辺の主切れ刃に連なる側とは反対側の端部を、ローテーション（１８０°の回転）によって刃先の位置交換がなされる側の主切れ刃の後端に、Ｒ１＜Ｒ２の条件を満たす曲げ半径Ｒ２のノーズＲ部を介して連ならせるとよい。   Further, the end of the short side of the side opposite to the side connected to the main cutting edge is set to the rear end of the main cutting edge on the side where the position of the cutting edge is exchanged by rotation (180 ° rotation), R1 <R2 It is good to connect via the nose R part of the bending radius R2 which satisfy | fills these conditions.

主切れ刃の先端と副切れ刃との間に形成されるノーズＲ部の曲げの半径Ｒ１は、ユーザのニーズによって変動するが、０．４〜６．０ｍｍが一般的である。短辺の反対側のノーズＲ部の曲げの半径Ｒ２は、そのＲ１の５〜１００倍くらいが望ましい。   The bending radius R1 of the nose R portion formed between the tip of the main cutting edge and the sub cutting edge varies depending on the needs of the user, but is generally 0.4 to 6.0 mm. The radius R2 of bending of the nose R portion on the opposite side of the short side is preferably about 5 to 100 times that R1.

この切削インサートは、カッタボディの外周に形成された座溝に、片方の側面がすくい面、上面（又は下面）とすくい面との交差部の稜線が主切れ刃、上面（又は下面）が主切れ刃の逃げ面、側面の片方の短辺の主切れ刃長手方向に突出した部分が最先端に位置して副切れ刃（サラエ刃）、端面の副切れ刃用の稜線を生じさせる部分が副切れ刃の逃げ面となる向きに装着する。   This cutting insert has a seat groove formed on the outer periphery of the cutter body, a rake line on one side, a ridge line at the intersection of the upper surface (or lower surface) and the rake surface as a main cutting edge, and an upper surface (or lower surface) as the main surface. The flank of the cutting edge, the part of the side that protrudes in the longitudinal direction of the main cutting edge on the short side is located at the forefront, and the part that generates the edge for the auxiliary cutting edge (Sarae blade) and the auxiliary cutting edge Install in the direction that becomes the flank of the secondary cutting edge.

上面を主切れ刃の逃げ面となす場合には、下面をカッタボディの座溝の座底面に着座させ、切削に関与しない側の側面と、切削に関与しない側の端面に設けられた２側面間の中央部の平面（又は、その平面と端面の副切れ刃の逃げ面として利用されない部分）とを前記座溝の座側面で受け支える。この発明は、このように構成されたフライスカッタも併せて提供する。   When the upper surface is used as the flank of the main cutting edge, the lower surface is seated on the bottom surface of the seat groove of the cutter body, and the two side surfaces provided on the side surface not involved in cutting and the end surface on the side not involved in cutting A central plane (or a portion that is not used as a flank of the secondary cutting edge at the end face) is received and supported by the seat side face of the seat groove. The present invention also provides a milling cutter configured in this manner.

この発明の切削インサートは、側面の短辺を左右非対称にしてその短辺の主切れ刃側を副切れ刃にしている。従って、副切れ刃の幅を好ましい数値範囲内で自由に変化させることができ、その幅を特許文献１，２の切削インサート（厚みが同一のインサート）よりも広くするなどして加工の条件変動に対する対応の自由度を拡げることができる。   In the cutting insert of the present invention, the short side of the side surface is asymmetrical and the main cutting edge side of the short side is the sub cutting edge. Therefore, the width of the secondary cutting edge can be freely changed within a preferable numerical range, and the processing conditions fluctuate by making the width wider than the cutting inserts (inserts having the same thickness) of Patent Documents 1 and 2. The degree of freedom in dealing with can be expanded.

それによって、送りなどが一定の条件を超えて高められたときにも加工面の良好な面粗さを維持することが可能になる。   As a result, it is possible to maintain a good surface roughness of the processed surface even when the feed is increased beyond a certain condition.

また、少なくとも端面の、２側面間の中央部に配置された平坦な第１の面を被支持面にして座溝の座側面で支えるようにしたので、副切れ刃の長さの変動があっても前記被支持面の面積が変動しない。   In addition, since the flat first surface arranged at the center between the two side surfaces of the end surface is supported and supported by the seat side surface of the seat groove, the length of the secondary cutting edge varies. However, the area of the supported surface does not vary.

これに加えて、副切れ刃を主切れ刃長手方向に突出させたために、副切れ刃が大きく損傷しても副切れ刃に対して段落ちした部分の端面には損傷の影響が及ばず、従って、段落ちした部分の端面を被支持面の一部として使用する場合にも被支持面の面積変動が起こらず、カッタボディによる支持が不安定なことによる加工面の面粗さの低下も防止される。   In addition to this, since the secondary cutting edge is protruded in the longitudinal direction of the primary cutting edge, even if the secondary cutting edge is greatly damaged, the end face of the stepped portion with respect to the secondary cutting edge is not affected by damage, Therefore, even when the end face of the stepped part is used as a part of the supported surface, the area of the supported surface does not change, and the surface roughness of the machined surface is reduced due to unstable support by the cutter body. Is prevented.

この発明の切削インサートの第１形態を示す斜視図The perspective view which shows the 1st form of the cutting insert of this invention 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側面図Side view of the cutting insert of FIG. 図１の切削インサートの端面図End view of the cutting insert of FIG. 図１の切削インサートを使用したフライスカッタの斜視図1 is a perspective view of a milling cutter using the cutting insert of FIG. 図５のフライスカッタの側面図Side view of the milling cutter of FIG. 図５のフライスカッタの正面図Front view of the milling cutter of FIG. 図１の切削インサート支持状態を示す断面図Sectional drawing which shows the cutting insert support state of FIG. この発明の切削インサートの第２形態を示す斜視図The perspective view which shows the 2nd form of the cutting insert of this invention 図９の切削インサートの側面図Side view of the cutting insert of FIG. この発明の切削インサートの第３形態を示す斜視図The perspective view which shows the 3rd form of the cutting insert of this invention 図１１の切削インサートの平面図Plan view of the cutting insert of FIG. 図１１の切削インサートの側面図Side view of the cutting insert of FIG. 図１１の切削インサートの端面図End view of the cutting insert of FIG. この発明の切削インサートの第４形態を示す斜視図The perspective view which shows the 4th form of the cutting insert of this invention 図１５の切削インサートの平面図Plan view of the cutting insert of FIG. 図１５の切削インサートの側面図Side view of the cutting insert of FIG. 図１５の切削インサートの端面図End view of the cutting insert of FIG. この発明の切削インサートの第５形態を示す斜視図The perspective view which shows the 5th form of the cutting insert of this invention 図１９の切削インサートの側面図Side view of the cutting insert of FIG. この発明の切削インサートの第６形態を示す斜視図The perspective view which shows the 6th form of the cutting insert of this invention 図２１の切削インサートの平面図Plan view of the cutting insert of FIG. 図２１の切削インサートの側面図Side view of the cutting insert of FIG. 図２１の切削インサートの端面図End view of the cutting insert of FIG. 図２１の切削インサートを使用したフライスカッタの斜視図The perspective view of the milling cutter using the cutting insert of FIG. 図２５のフライスカッタの側面図Side view of milling cutter of FIG. 図２５のフライスカッタの正面図Front view of the milling cutter of FIG.

以下、添付図面の図１〜図２７に基づいて、この発明の切削インサートとそれを用いたフライスカッタの実施の形態を説明する。図１〜図４は、この発明の切削インサートの第１形態（ブレーカ溝無し）を示している。   Embodiments of a cutting insert of the present invention and a milling cutter using the same will be described below with reference to FIGS. 1 to 4 show a first form (no breaker groove) of a cutting insert according to the present invention.

この切削インサート１は、四角形を基本形としたものであって、縦長に形成された側面４の左右の長辺が主切れ刃６として使用され、側面４の両短辺の一部が副切れ刃７（サラエ刃）として使用される。   The cutting insert 1 has a quadrangular basic shape, and the left and right long sides of the side surface 4 formed in a vertically long shape are used as the main cutting edge 6, and a part of both short sides of the side surface 4 is the sub cutting edge. Used as 7 (Sarae blade).

側面４の長辺は、上面２及び下面３との交差部に形成される稜線である。また、側面４の短辺は、端面５との交差部に形成される稜線である。   The long side of the side surface 4 is a ridge line formed at the intersection with the upper surface 2 and the lower surface 3. The short side of the side surface 4 is a ridge line formed at the intersection with the end surface 5.

下面３側は上面２側と同一構成である。また、対向した２つの側面４、４の構成や対向した２つの端面５，５の構成も同一である。従って、ここでの説明は、上面側の構成と、片方の側面、端面の構成のみについて行う。   The lower surface 3 side has the same configuration as the upper surface 2 side. The configuration of the two opposing side surfaces 4 and 4 and the configuration of the two opposing end surfaces 5 and 5 are the same. Therefore, the description here will be made only on the configuration of the upper surface side and the configuration of one side surface and the end surface.

側面４の短辺は、図３に示すように、左右非対称の辺にしている。その短辺の一端側は、半径Ｒ１のノーズＲ部８を介して主切れ刃６の先端に連なり、他端側よりも主切れ刃６の長手方向に突出している。その突出した一端側が副切れ刃７として使用される。   The short side of the side surface 4 is an asymmetrical side as shown in FIG. One end side of the short side is connected to the tip of the main cutting edge 6 via a nose R portion 8 having a radius R1, and protrudes in the longitudinal direction of the main cutting edge 6 from the other end side. The protruding one end side is used as the auxiliary cutting edge 7.

また、側面４の短辺の他端側は、ローテーション（１８０°の回転）によって位置の入れ替えがなされる側の主切れ刃６の後端に、半径Ｒ２のノーズＲ部９を介して連なっている。   Further, the other end side of the short side of the side surface 4 is connected to the rear end of the main cutting edge 6 on the side whose position is changed by rotation (rotation of 180 °) through a nose R portion 9 having a radius R2. Yes.

端面５は、平行配置の２側面４，４間の中央部に設ける第１の面５ａと、対角位置にそれぞれ設ける第２の面５ｂと、その第２の面と隣り合う位置に設ける第３の面５ｃとで構成されている。   The end surface 5 includes a first surface 5a provided at the center between the two side surfaces 4 and 4 arranged in parallel, a second surface 5b provided at each diagonal position, and a second surface provided adjacent to the second surface. 3 surfaces 5c.

第１の面５ａは、副切れ刃７よりも低い位置に配置し、端面をインサート厚み方向に横断する平坦な面にしている。また、第２の面５ｂは、第１の面５ａに対して傾いて側面４に鋭角に交わる面にしており、第１の面５ａとの間に段差を生じたこの第２の面５ｂを副切れ刃７の逃げ面となし、この第２の面５ｂと側面４との間に副切れ刃７となる稜線を生じさせている。   The 1st surface 5a is arrange | positioned in the position lower than the subcutting edge 7, and makes it the flat surface which crosses an end surface in an insert thickness direction. The second surface 5b is a surface that is inclined with respect to the first surface 5a and intersects the side surface 4 at an acute angle, and the second surface 5b having a step with the first surface 5a is formed. A flank of the secondary cutting edge 7 is formed, and a ridge line to be the secondary cutting edge 7 is generated between the second surface 5 b and the side surface 4.

第３の面５ｃは、側面４との間に切削に関与しない稜線を生じさせる。例示の切削インサートの場合、この第３の面５ｃは、第１の面５ａを延長した平面で構成されて第１の面５ａと同一高さレベルに配置されており、第１の面５ａとこの第３の面５ｃが被支持面として用いられてカッタボディに対する切削インサートの軸方向位置決めと、フライス加工において切削インサート１に加わる軸方向の荷重の受け止めに利用される。   The 3rd surface 5c produces the ridgeline which does not participate in cutting between the side surfaces 4. FIG. In the case of the illustrated cutting insert, the third surface 5c is configured by a plane extending from the first surface 5a and is disposed at the same level as the first surface 5a. The third surface 5c is used as a supported surface and is used for axial positioning of the cutting insert with respect to the cutter body and for receiving axial loads applied to the cutting insert 1 in milling.

図３に示した副切れ刃７の刃幅ｔは、インサート厚みＴの１／３〜２／３程度に設定される。その刃幅ｔが１／３Ｔ以下では、前掲の特許文献１，２が開示している切削インサートと比較して加工の条件変動に対する対応の自由度などの面であまり優位差のないものになる。   The blade width t of the auxiliary cutting edge 7 shown in FIG. 3 is set to about 1/3 to 2/3 of the insert thickness T. When the blade width t is equal to or less than 1 / 3T, the cutting insert disclosed in the above-mentioned Patent Documents 1 and 2 does not have a significant difference in terms of the degree of freedom in dealing with variations in machining conditions. .

また、その刃幅ｔが２／３Ｔを超えると、副切れ刃の切削負担が増して切削トルクが過大になる。   Moreover, when the blade width t exceeds 2 / 3T, the cutting load of the secondary cutting edge increases and the cutting torque becomes excessive.

副切れ刃７と主切れ刃６の間に形成されるコーナ部のコーナ角θは、８５°〜１４０°（８５°≦θ≦１４０°）の範囲が適当である。この範囲を外れると、加工面のコーナの直角度を好ましいと考えられる範囲に維持するのが難しくなる。   The corner angle θ of the corner portion formed between the sub cutting edge 7 and the main cutting edge 6 is suitably in the range of 85 ° to 140 ° (85 ° ≦ θ ≦ 140 °). Outside this range, it becomes difficult to maintain the squareness of the corner of the processed surface within a range that is considered preferable.

なお、図示の切削インサートは副切れ刃７を直線の刃にしたが、これは、凸円弧の刃であってもよく、その円弧刃の場合、円弧の半径は、２００〜１０００ｍｍ程度が適当である。その範囲の円弧半径であれば、一般的に要求される加工面粗さを確保することができる。   In the illustrated cutting insert, the secondary cutting edge 7 is a straight blade, but this may be a convex arcuate blade. In the case of the arcuate blade, the radius of the arc is suitably about 200 to 1000 mm. is there. If it is the arc radius of the range, the generally required machining surface roughness can be secured.

ノーズＲ部８，９の曲げの半径Ｒ１，Ｒ２は、Ｒ１＜Ｒ２の関係を満たすものにしている。   Bending radii R1 and R2 of the nose R portions 8 and 9 satisfy the relationship of R1 <R2.

主切れ刃６の先端と副切れ刃７との間に形成されるノーズＲ部８の曲げの半径Ｒ１は、一般的に要求される０．４〜６．０ｍｍ程度でよい。主切れ刃の後端側のノーズＲ部９の曲げの半径Ｒ２は、Ｒ１の５〜１００倍程度にするとよい。   The bending radius R1 of the nose R portion 8 formed between the tip of the main cutting edge 6 and the sub cutting edge 7 may be about 0.4 to 6.0 mm which is generally required. The bending radius R2 of the nose R portion 9 on the rear end side of the main cutting edge is preferably about 5 to 100 times R1.

この第１形態の切削インサート１を使用したフライスカッタの第１形態を図５〜図８に示す。図示のフライスカッタ２０は、隅削り用であって、カッタボディ２１の外周に座溝２２と切屑ポケット２３を、回転方向に所定の間隔をあけて複数設けている。   The 1st form of the milling cutter using the cutting insert 1 of this 1st form is shown in FIGS. The illustrated milling cutter 20 is for corner cutting, and a plurality of seat grooves 22 and chip pockets 23 are provided on the outer periphery of the cutter body 21 at predetermined intervals in the rotation direction.

そして、各座溝２２に切削インサート１を挿入し、その切削インサート１を取付けねじ２４で座溝の座底面２２ａ上に固定している。   Then, the cutting insert 1 is inserted into each seat groove 22, and the cutting insert 1 is fixed on the seat bottom surface 22 a of the seat groove with a mounting screw 24.

切削インサート１は、座溝２２に、片方の側面４がすくい面、上面２（又は、下面３）とすくい面との交差部の稜線が主切れ刃６、上面２（又は、下面３）が主切れ刃の逃げ面、側面の片方の短辺の主切れ刃先端に連なる側が副切れ刃７、最先端に置かれる片方の端面５の第２の面５ｂが副切れ刃７の逃げ面となる向きに装着されている。   In the cutting insert 1, the side groove 4 has a rake face, the ridgeline at the intersection of the upper face 2 (or lower face 3) and the rake face has a main cutting edge 6, and the upper face 2 (or lower face 3). The flank of the main cutting edge, the side that is connected to the tip of the main cutting edge on one short side of the side surface is the auxiliary cutting edge 7, and the second surface 5b of the end face 5 that is placed at the forefront is the flank of the auxiliary cutting edge 7. It is installed in the direction.

なお、切削に関与しない側の側面４は、座溝２２の座側面２２ｂによって支持され、その座側面２２ｂによる支持部によって切削インサートのカッタ回転方向の位置決めがなされる。   The side surface 4 on the side not involved in cutting is supported by the seat side surface 22b of the seat groove 22, and the cutting insert is positioned in the cutter rotation direction by the support portion of the seat side surface 22b.

また、切削に関与しない側の端面５の第１の面５ａと第３の面５ｃは、座溝２２の座側面２２ｃによって支持され、その座側面２２ｃによる支持部によって切削インサート１のカッタ軸方向の位置決めがなされる。   The first surface 5a and the third surface 5c of the end surface 5 on the side not involved in cutting are supported by the seat side surface 22c of the seat groove 22, and the cutter axial direction of the cutting insert 1 is supported by the support portion by the seat side surface 22c. Is positioned.

切削インサート１のカッタ径方向の位置決めは、座底面２２ａによる支持部によってなされる。   Positioning of the cutting insert 1 in the cutter radial direction is performed by a support portion by the seat bottom surface 22a.

図９、図１０は、この発明の切削インサートの第２形態を示している。この第２形態の基本構成は第１形態と同じである。この第２形態は、主切れ刃６と副切れ刃７に沿ってすくい面となす側面４に切屑を処理するブレーカ溝１０を設けており、この部分が第１形態と異なる。その他の構成は第１形態と同じであるので説明を省く。   9 and 10 show a second embodiment of the cutting insert of the present invention. The basic configuration of the second form is the same as that of the first form. This 2nd form provides the breaker groove | channel 10 which processes a chip on the side surface 4 which makes a rake face along the main cutting edge 6 and the subcutting edge 7, and this part differs from a 1st form. Since other configurations are the same as those of the first embodiment, the description thereof is omitted.

図１１〜図１４は、この発明の切削インサートの第３形態を示している。この第３形態も基本構成は第２形態と同じである。この第３形態は、主切れ刃６と副切れ刃７に沿って側面４にブレーカ溝１０を設けている。   FIGS. 11-14 has shown the 3rd form of the cutting insert of this invention. The basic configuration of the third embodiment is the same as that of the second embodiment. In the third embodiment, a breaker groove 10 is provided on the side surface 4 along the main cutting edge 6 and the sub cutting edge 7.

また、副切れ刃７の位置を最も高くし、主切れ刃６を副切れ刃７に連なる先端側から後端側に行くに従って位置が下がる方向に傾斜させている。   Moreover, the position of the sub cutting edge 7 is made the highest, and the main cutting edge 6 is inclined in the direction in which the position decreases as it goes from the front end side connected to the sub cutting edge 7 to the rear end side.

第３形態のその他の構成は、第２形態と同じである。従って、第２形態と同一箇所については説明を省く。   Other configurations of the third embodiment are the same as those of the second embodiment. Therefore, the description of the same part as the second embodiment is omitted.

図１５〜図１８は、この発明の切削インサートの第４形態である。この第４形態は、アプローチ角を有するフライスカッタ用として構成したものであって、副切れ刃７を、主切れ刃６との間のコーナ角θが１２０°〜１４０°程度となるように傾斜させている。その他の構成は第１形態とほぼ同じであるので説明を省く。   FIGS. 15-18 is the 4th form of the cutting insert of this invention. This 4th form is comprised for the milling cutters which have an approach angle, Comprising: The secondary cutting edge 7 inclines so that corner angle (theta) between the main cutting edges 6 may be set to about 120 degrees-140 degrees. I am letting. Other configurations are substantially the same as those in the first embodiment, and thus description thereof is omitted.

図１９、図２０は、この発明の切削インサートの第５形態である。この第５形態もアプローチ角を有するフライスカッタ用として構成したものであって、副切れ刃７を、主切れ刃６との間のコーナ角θが１２０°〜１４０°程度となるように傾斜させ、さらに、すくい面となる側面４にブレーカ溝１０を設けている。その他の構成は第２形態とほぼ同じであるので説明を省く。   19 and 20 show a fifth embodiment of the cutting insert of the present invention. This fifth embodiment is also configured for a milling cutter having an approach angle, and the secondary cutting edge 7 is inclined so that the corner angle θ between the main cutting edge 6 is about 120 ° to 140 °. In addition, a breaker groove 10 is provided on the side surface 4 serving as a rake face. Since other configurations are substantially the same as those of the second embodiment, description thereof is omitted.

図２１〜図２４は、この発明の切削インサートの第６形態である。この第６形態もアプローチ角を有するフライスカッタ用として構成したものであって、副切れ刃７を、主切れ刃６とのなす角θが１２０°〜１４０°程度となるように傾斜させている。   FIGS. 21-24 is the 6th form of the cutting insert of this invention. The sixth embodiment is also configured for a milling cutter having an approach angle, and the secondary cutting edge 7 is inclined so that the angle θ formed with the main cutting edge 6 is about 120 ° to 140 °. .

また、すくい面となる側面４にブレーカ溝１０を設け、さらに、副切れ刃７の位置を最も高くして主切れ刃６を副切れ刃７に連なる先端側から後端側に行くに従って位置が下がる方向に傾斜させている。その他の構成は第３形態とほぼ同じであるので説明を省く。   In addition, a breaker groove 10 is provided on the side surface 4 serving as a rake face, and the position of the main cutting edge 6 is increased from the front end side connected to the sub cutting edge 7 to the rear end side with the highest position of the sub cutting edge 7. It is tilted in the downward direction. The other configuration is almost the same as that of the third embodiment, so that the description is omitted.

第６形態の切削インサート１を使用したフライスカッタの一例を図２５〜図２７に示す。図示のフライスカッタ２０は、アプローチ角４５°の正面フライスカッタであって、カッタボディ２１の外周に座溝２２と切屑ポケット２３を、回転方向に所定の間隔をあけて複数設けている。   An example of the milling cutter using the cutting insert 1 of the sixth embodiment is shown in FIGS. The illustrated milling cutter 20 is a front milling cutter with an approach angle of 45 °, and a plurality of seat grooves 22 and chip pockets 23 are provided on the outer periphery of the cutter body 21 at predetermined intervals in the rotational direction.

そして、各座溝２２に切削インサート１を挿入し、その切削インサート１を取付けねじ２４で座溝の座底面２２ａ上に固定している。   Then, the cutting insert 1 is inserted into each seat groove 22, and the cutting insert 1 is fixed on the seat bottom surface 22 a of the seat groove with a mounting screw 24.

切削インサート１は、片方の側面４がすくい面、上面２とすくい面との交差部の稜線が４５°のアプローチ角を有する主切れ刃６、上面２（又は下面３）が主切れ刃の逃げ面、側面の片方の短辺の主切れ刃先端に連なる側が副切れ刃７、最先端に置かれる片方の端面５の第２の面５ｂが副切れ刃７の逃げ面となる向きに装着されている。   The cutting insert 1 includes a main cutting edge 6 whose one side surface 4 has a rake face, an ridge line at the intersection of the upper face 2 and the rake face has an approach angle of 45 °, and the upper face 2 (or the lower face 3) is a relief of the main cutting edge. The side that is connected to the tip of the main cutting edge on one short side of the surface and the side is attached to the secondary cutting edge 7, and the second surface 5 b of the one end face 5 that is placed at the foremost side is mounted to face the secondary cutting edge 7. ing.

なお、座溝２２の座底面で受ける下面３（又は上面２）と、切削に関与しない側の側面４と、切削に関与しない側の端面５の座溝２２による支持は、第１形態のフライスカッタと同様になされる。   Note that the lower surface 3 (or the upper surface 2) received by the seat bottom of the seat groove 22, the side surface 4 on the side not involved in cutting, and the end groove 5 on the side not involved in cutting by the seat groove 22 are supported by the milling cutter of the first embodiment. It is done in the same way as a cutter.

このように、第４〜第６形態の切削インサートは、側面４の短辺の副切れ刃７となす領域を主切れ刃に対して鈍角をなすように傾けたので、アプローチ角のあるフライスカッタ、例えば、アプローチ角２５°、或いは４５°の正面フライスカッタに採用することが可能になる。
Thus, since the cutting insert of the 4th-6th form inclined the area | region which becomes the minor cutting edge 7 of the short side of the side surface 4 so that an obtuse angle might be made with respect to the main cutting edge, the milling cutter with an approach angle | corner For example, it can be employed for a front milling cutter with an approach angle of 25 ° or 45 °.

１ 切削インサート
２ 上面
３ 下面
４ 側面
５ 端面
５ａ 第１の面
５ｂ 第２の面
５ｃ 第３の面
６ 主切れ刃
７ 副切れ刃
８ 主切れ刃先端のノーズＲ部
９ 主切れ刃後端のノーズＲ部
１０ ブレーカ溝
２０ 隅削りフライスカッタ
２１ カッタボディ
２２ 座溝
２２ａ 座底面
２２ｂ，２２ｃ，２２ｄ 座側面
２３ 切屑ポケット
２４ 取付けねじ
Ｒ１ 主切れ刃先端のノーズＲ部の曲げ半径
Ｒ２ 主切れ刃後端のノーズＲ部の曲げ半径
θ コーナ角
ｔ 副切れ刃の刃幅
Ｔ インサート厚み DESCRIPTION OF SYMBOLS 1 Cutting insert 2 Upper surface 3 Lower surface 4 Side surface 5 End surface 5a 1st surface 5b 2nd surface 5c 3rd surface 6 Main cutting edge 7 Secondary cutting edge 8 Nose R part 9 of main cutting edge front end of main cutting edge Nose R section 10 Breaker groove 20 Corner milling cutter 21 Cutter body 22 Seat groove 22a Seat bottom face 22b, 22c, 22d Seat side face 23 Chip pocket 24 Mounting screw R1 Bending radius R2 of nose R section at the tip of the main cutting edge After the main cutting edge Bending radius of end nose radius part θ Corner angle t Secondary cutting edge width T Insert thickness

Claims (7)

縦長の側面（４）をすくい面、側面の長辺を主切れ刃（６）、上面（２）又は下面（３）を主切れ刃の逃げ面、側面（４）の短辺を副切れ刃（７）、端面（５）の一部を副切れ刃の逃げ面として使用する縦型刃先交換式切削インサートを、
前記側面（４）の短辺が左右非対称をなし、その短辺の一部が前記副切れ刃（７）として構成され、その副切れ刃（７）が、インサートの側面視において短辺の残りの一部よりも主切れ刃の長さ方向に突出して主切れ刃（６）の先端に曲げ半径Ｒ１のノーズＲ部（８）を介して連なり、
前記端面（５）の平行配置の２側面（４，４）間の中央部が前記副切れ刃（７）よりも低い位置にあって平坦な第１の面（５ａ）として構成されたものにした縦型刃先交換式切削インサート。 Long side face (4) is rake face, long side face is main cutting edge (6), upper face (2) or lower face (3) is flank face of main cutting edge, and short side of side face (4) is minor cutting edge. (7) A vertical cutting edge replaceable cutting insert that uses a part of the end face (5) as a flank of the auxiliary cutting edge,
The short side of the side surface (4) is left-right asymmetric, a part of the short side is configured as the secondary cutting edge (7), and the secondary cutting edge (7) is the remaining short side in the side view of the insert. Projecting in the length direction of the main cutting edge from a part of the main cutting edge (6) connected to the tip of the main cutting edge (6) via a nose R portion (8) having a bending radius R1,
The center portion between the two side surfaces (4, 4) in parallel arrangement of the end surface (5) is located at a position lower than the auxiliary cutting edge (7) and is configured as a flat first surface (5a). Vertical cutting edge exchangeable cutting insert. 前記端面（５）の、副切れ刃の逃げ面として利用されない部分を、前記第１の面（５ａ）と同一高さレベルの平面の第３の面（５ｃ）となした請求項１に記載の縦型刃先交換式切削インサート。   The portion of the end face (5) that is not used as a flank for the secondary cutting edge is a third surface (5c) that is a flat surface at the same height as the first surface (5a). Vertical cutting edge replaceable cutting insert. 前記副切れ刃（７）の刃幅ｔを、インサート厚みＴの１／３〜２／３に設定した請求項１又は２に記載の縦型刃先交換式切削インサート。   The vertical blade-tip-exchangeable cutting insert according to claim 1 or 2, wherein a blade width t of the secondary cutting edge (7) is set to 1/3 to 2/3 of an insert thickness T. 前記主切れ刃（６）と前記副切れ刃（７）との間に形成されるコーナ部のコーナ角θを、８５°≦θ≦１４０°の条件を満たすように設定した請求項１〜３のいずれかに記載の縦型刃先交換式切削インサート。   The corner angle θ of a corner portion formed between the main cutting edge (6) and the sub cutting edge (7) is set so as to satisfy the condition of 85 ° ≦ θ ≦ 140 °. The vertical cutting edge replaceable cutting insert according to any one of the above. 前記副切れ刃（７）を、半径が２００〜１０００ｍｍの円弧をなす円弧刃にした請求項１〜４のいずれかに記載の縦型刃先交換式切削インサート。   The vertical cutting edge replaceable cutting insert according to any one of claims 1 to 4, wherein the sub-cutting edge (7) is an arcuate blade having an arc having a radius of 200 to 1000 mm. 前記側面（４）の短辺の主切れ刃に連なる側とは反対側の端部を、ローテーションによって位置交換がなされる側の主切れ刃の後端に、Ｒ１＜Ｒ２の条件を満たす曲げ半径Ｒ２のノーズＲ部（９）を介して連ならせた請求項１〜５のいずれかに記載の縦型刃先交換式切削インサート。   A bending radius that satisfies the condition of R1 <R2 with the end of the side surface (4) opposite to the side that is continuous with the main cutting edge on the short side being the rear end of the main cutting edge on the side whose position is exchanged by rotation The vertical cutting edge replaceable cutting insert according to any one of claims 1 to 5, wherein the cutting inserts are connected via a nose R portion (9) of R2. 請求項１〜６のいずれかに記載の切削インサート（１）を、カッタボディ（２１）の外周に形成された座溝（２２）に、片方の側面（４）がすくい面、上面（２）又は下面（３）とすくい面との交差部の稜線が主切れ刃（６）、上面（２）又は下面（３）が主切れ刃の逃げ面、側面（４）の片方の短辺が最先端に位置して副切れ刃（７）、片方の端面の前記第１の面（５ａ）が副切れ刃（７）の逃げ面となる向きに装着し、上面（２）と下面（３）の切削に関与しない側を前記座溝の座底面（２２ａ）で、切削に関与しない側の側面（４）を前記座溝の座側面（２２ｂ）で、切削に関与しない側の端面の前記第１の面（５ａ）もしくはその第１の面（５ａ）と第３の面（５ｃ）を前記座溝の座側面（２２ｃ）で各々支持して構成される隅削りフライスカッタ。   The cutting insert (1) according to any one of claims 1 to 6, wherein one side surface (4) is a rake surface, an upper surface (2) in a seat groove (22) formed on the outer periphery of the cutter body (21). Alternatively, the ridge line at the intersection of the lower surface (3) and the rake face is the main cutting edge (6), the upper surface (2) or the lower surface (3) is the flank of the main cutting edge, and the short side on one side of the side surface (4) is the most. A secondary cutting edge (7) located at the tip, and mounted so that the first surface (5a) of one end face becomes a relief surface of the secondary cutting edge (7), an upper surface (2) and a lower surface (3) The side that does not participate in cutting is the seat bottom (22a) of the seat groove, the side surface (4) that does not participate in cutting is the seat side surface (22b) of the seat groove, and the end face on the side that does not participate in cutting is the first side. Corner cutting constituted by supporting one surface (5a) or the first surface (5a) and the third surface (5c) with the seat side surface (22c) of the seat groove. Rice cutter.
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JP2015528398A (en) * 2012-09-18 2015-09-28 ハルトメタル−ウェルクゾーグファブリック ポール ホーン ゲゼルシャフト ミット ベシュレンクテル ハフツング Cutting inserts and tools for machining workpieces
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JP7205707B1 (en) 2022-06-03 2023-01-17 株式会社タンガロイ Cutting insert and cutting tool with cutting insert
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