JP4671643B2 - Milling tools - Google Patents

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JP4671643B2
JP4671643B2 JP2004249291A JP2004249291A JP4671643B2 JP 4671643 B2 JP4671643 B2 JP 4671643B2 JP 2004249291 A JP2004249291 A JP 2004249291A JP 2004249291 A JP2004249291 A JP 2004249291A JP 4671643 B2 JP4671643 B2 JP 4671643B2
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flank
cutting edge
outer peripheral
peripheral cutting
rear end
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JP2006062048A (en
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薫 八田
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Kyocera Corp
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Kyocera Corp
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Description

本発明は、ホルダの先端部に切削インサートを装着して使用するフライス工具に関する。   The present invention relates to a milling tool that is used with a cutting insert attached to the tip of a holder.

近年、フライス工具の高精度、高能率への要求が大きくなり、それに用いられる切削インサートも様々な形状が開発され、金型加工等の様々な分野で利用されている。   In recent years, demands for high precision and high efficiency of milling tools have increased, and various shapes of cutting inserts used for them have been developed and used in various fields such as die machining.

例えば、特許文献１では、略平行四辺形板状をなし、すくい面をなす上面と逃げ面をなす側面との交叉稜線に波形状の切刃を備えた切削インサートが記載されている。   For example, Patent Document 1 describes a cutting insert having a substantially parallelogram plate shape and having a corrugated cutting edge on the crossing ridge line between the upper surface forming the rake face and the side surface forming the flank face.

ここで、上記切削インサートにおける逃げ面は、波状の主逃げ面から階段状の逃げを介して、厚み方向が曲面でかつ長手方向が螺旋状に捩れた複雑な形状をなしてホルダ拘束面となる第２の逃げ面にて構成されている。さらに、ホルダに取り付けた時の外周切刃の実質的な逃げ角や、切削インサートのすくい面と主逃げ面とのなす角が先端部から後端部にわたって一定としたことにより、９０度の肩加工が精度よく加工可能であると記載されている。
特開平１１−３３３６１６号公報 Here, the flank in the cutting insert becomes a holder constraining surface having a complicated shape in which the thickness direction is curved and the longitudinal direction is twisted spirally from the wavy main flank through the stepped flank. It consists of a second flank. Furthermore, the substantial clearance angle of the outer peripheral cutting edge when mounted on the holder and the angle formed by the rake face of the cutting insert and the main clearance surface are constant from the front end portion to the rear end portion. It is described that processing can be performed with high accuracy.
JP-A-11-333616

しかしながら、特許文献１の切削インサートでは、縦切込みを大きくとって加工した場合においては、切刃全体としての切れ味が低下するので、切削抵抗が増大し、最初に被削材に衝突して衝撃の大きい先端部に欠損が発生したり、加工面にバリが発生するようになり、また、切削に用いる外周切刃のうちで最も後端部にあたる部分付近に境界損傷が発生するという問題があった。   However, with the cutting insert of Patent Document 1, when machining with a large vertical depth of cut, the sharpness of the entire cutting blade decreases, so that the cutting resistance increases, and the impact is first caused by collision with the work material. There was a problem that defects occurred at the large tip, burrs occurred on the machined surface, and boundary damage occurred near the portion corresponding to the rear end of the outer peripheral cutting blade used for cutting. .

また、このように切れ味が悪くなると切削インサートにかかる負荷が増大するが、特許文献１のように逃げ面が螺旋状にねじられた複雑な形状をなしていると、ホルダと当接する拘束面が曲面であることから面精度が低下し、安定した拘束力が得られずビビリ振動が発生して高品位な切削ができなくなり、しかも欠損や境界損傷がさらに発生しやすくなるという問題があった。   In addition, when the sharpness is deteriorated in this way, the load applied to the cutting insert increases. However, as in Patent Document 1, if the flank has a complicated shape spirally twisted, the constraining surface that comes into contact with the holder is reduced. Since it is a curved surface, there is a problem that surface accuracy is lowered, stable restraining force cannot be obtained, chatter vibration is generated, high-quality cutting cannot be performed, and defects and boundary damage are more likely to occur.

さらに、上記複雑な逃げ面形状は製造上の作製に手間がかかるとともに精度管理が容易でなく安定したフライス工具を供給できないという不具合があった。   Furthermore, the complicated flank shape has a problem in that it takes time to manufacture in production and accuracy control is not easy and a stable milling tool cannot be supplied.

本発明は、上記課題を解決するためのものであり、切刃の欠損や境界欠損、バリの発生を低減できるとともに、製造が容易でかつ高精度な切削加工が行える切削インサートを具備するフライス工具を提供することを目的とする。   The present invention is for solving the above-mentioned problems, and can provide a milling tool including a cutting insert that can reduce chipping, boundary chipping, and burr generation, and that can be easily manufactured and can perform high-precision cutting. The purpose is to provide.

本発明によれば、切削加工する際に初めに被削材と接触し大きな衝撃を受けて欠損が発生しやすい外周切刃の先端部における実質的な逃げ角を小さくしかつ外周切刃の後端部における実質的な逃げ角を大きくできるとともに、切削インサートを容易に精度よく製造できてホルダへの拘束力を安定して高めることができることから、外周切刃先端部に欠損が発生することなく、特に切れ味が極端に悪くなることなく、広範な切削条件で欠損や境界損傷が発生することなくかつ精度よく安定した切削加工が可能となる。   According to the present invention, at the time of cutting, the substantial clearance angle at the front end portion of the outer peripheral cutting edge that is first contacted with the work material and receives a large impact and is likely to be damaged is reduced, and after the outer peripheral cutting edge. Since the substantial clearance angle at the end can be increased, and the cutting insert can be manufactured easily and accurately, and the restraining force on the holder can be stably increased, so that there is no defect at the tip of the outer peripheral cutting edge. In particular, the sharpness is not extremely deteriorated, and the cutting can be performed stably with high accuracy without occurrence of chipping or boundary damage under a wide range of cutting conditions.

すなわち、本発明のフライス工具は、ホルダの先端部に少なくとも一つの切削インサートを装着してなるフライス工具において、前記切削インサートが、多角形状を基本形状として、着座面をなす底面と、すくい面をなす上面と、逃げ面をなす側面と、前記すくい面と逃げ面との交差稜線部に形成されて前記ホルダの外周に位置する外周切刃と、前記切削インサートの角部にあって前記外周切刃と接続するコーナ切刃と、を備えており、前記外周切刃から続く逃げ面は、前記外周切刃に隣接する第一逃げ面と、該第一逃げ面よりも底面側に位置する第二逃げ面と、からなり、前記第二逃げ面が３つの区間に分割され、前記コーナ切刃側にあって、前記外周切刃の先端部に位置する第二逃げ面と、前記コーナ切刃から遠ざかる側にあって、前記外周切刃の後端部に位置する第二逃げ面と、前記外周切刃の前記先端部と前記後端部との間の中央部に位置する第二逃げ面とからなり、前記第二逃げ面は、前記外周切刃の前記先端部、前記中央部、および前記後端部の位置において前記第一逃げ面に隣接しており、前記外周切刃の先端部に位置する第二逃げ面と、前記外周切刃の後端部に位置する第二逃げ面とが同一平面上に位置するとともに、前記外周切刃の先端部においては第一逃げ面の逃げ角が第二逃げ面の逃げ角に対し小さく、かつ前記外周切刃の後端部においては前記第一逃げ面の逃げ角が前記第二逃げ面の逃げ角に対し大きいことを特徴とする。 That is, the milling tool of the present invention is a milling tool in which at least one cutting insert is mounted on the tip of a holder, wherein the cutting insert has a polygonal shape as a basic shape, a bottom surface that forms a seating surface, and a rake surface. An upper surface, a side surface that forms a flank surface, an outer peripheral cutting edge that is formed on a cross ridge line portion between the rake surface and the flank surface, and is positioned on the outer periphery of the holder; A corner cutting edge connected to the blade, and a flank that continues from the outer peripheral cutting edge is a first flank adjacent to the outer peripheral cutting edge, and a first flank located closer to the bottom side than the first flank. a secondary flank consists, the second flank is divided into three sections, in the said corner cutting edge side, a second flank located on the distal end portion of the outer peripheral cutting edge, the corner cutting edge there on the side away from, the A second flank located on the rear end portion of the peripheral cutting edge, consists of a second flank located on the central portion between the tip and the rear end portion of the outer peripheral cutting edge, the second flank A surface is adjacent to the first flank at the positions of the front end, the center, and the rear end of the outer peripheral cutting edge, and a second flank located at the front end of the outer peripheral cutting edge; The second flank located at the rear end of the outer peripheral cutting edge is located on the same plane, and the flank angle of the first flank at the tip of the outer peripheral cutting edge is the flank angle of the second flank. to small and at the rear end of the outer peripheral cutting edge, wherein the clearance angle of the first flank is greater with respect to the relief angle of the second flank.

ここで、前記外周切刃が、前記コーナ切刃側に位置するとともに、前記底面からの高さ位置が同じ先端平坦区間と、前記先端平坦区間の後端に位置するとともに、先端から後端に向かって高さが漸減する傾斜区間と、前記傾斜区間の後端に位置するとともに、前記底面からの高さ位置が同じ後端平坦区間とを備えることが、外周切刃先端部における切刃強度を高めることができるとともに外周切刃後端部に向かう中央部で切削抵抗が増大することを防止でき、さらに、外周切刃後端部において切削インサートを取り扱う際に必要な強度を確保するとともに逃げ面のホルダへの拘束面積を確保しかつ外周切刃中央部における傾斜角度をよりきつくして切削抵抗をより低減させることにより、欠損や境界損傷等の発生を抑制できる点で望ましい。 Here, the outer peripheral cutting edge is located on the corner cutting edge side, the height position from the bottom surface is the same at the front end flat section , and at the rear end of the front end flat section, and from the front end to the rear end. The cutting edge strength at the tip of the outer peripheral cutting edge is provided with an inclined section whose height gradually decreases toward the rear end of the inclined section and a rear end flat section having the same height position from the bottom surface. In addition, it is possible to prevent the cutting resistance from increasing at the center toward the rear end of the outer peripheral cutting edge, and to secure the necessary strength when handling the cutting insert at the rear end of the outer peripheral cutting edge and to escape. It is desirable in that the generation of defects and boundary damage can be suppressed by securing a constrained area to the holder of the surface and further reducing the cutting resistance by tightening the inclination angle at the central portion of the outer peripheral cutting edge.

さらに、前記外周切刃の中間に位置する第二逃げ面が、該第二逃げ面の上部に位置する前記第一逃げ面と同一面にて形成されることが、インサート形状を高精度にかつ容易に製造できる点で望ましい。なお、この外周切刃の中央部分は成型、焼成時の変形が最も大きくなる部分であり、この部分の形状を単純化することによって成形時の粉末充填の均一性が改善され、焼成時の変形を小さくできるという効果もある。   Furthermore, the second flank located in the middle of the outer peripheral cutting edge is formed in the same plane as the first flank located above the second flank, so that the insert shape can be made with high accuracy. This is desirable because it can be easily manufactured. The central part of this outer peripheral cutting edge is the part where deformation during molding and firing is the largest, and by simplifying the shape of this part, the uniformity of powder filling during molding is improved, and deformation during firing There is also an effect that can be reduced.

上記本発明のフライス工具は、切削加工において初めに被削材と接触して大きな衝撃がかかり欠損が発生しやすい外周切刃先端部における本体取り付け時の実質的な逃げ角を小さくしかつ外周切刃後端部における実質的な逃げ角を大きくできるとともに、拘束力の強い形状の切削インサートを容易に製造できてホルダへの拘束力を安定して高めることができる。その結果、外周切刃先端部に欠損が発生することなく、特に、大きな縦切込みをかけるような切削条件において切れ味が極端に悪くなることなく、境界損傷が発生せず良好な切削が可能となる。   The above-described milling tool of the present invention reduces the substantial clearance angle at the time of mounting the main body at the tip of the outer peripheral cutting edge, which is likely to be damaged due to a large impact when it first comes into contact with the work material in the cutting process. A substantial clearance angle at the blade rear end can be increased, and a cutting insert having a shape with a strong restraining force can be easily manufactured, and the restraining force on the holder can be stably increased. As a result, there is no chipping at the tip of the outer peripheral cutting edge, and particularly good cutting can be performed without causing any boundary damage, without sharply deteriorating sharpness under cutting conditions in which a large vertical cut is made. .

以下、本発明の実施形態を添付図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１乃至図７は本発明のフライス工具（以下、工具と略す。）の実施態様の一例を示すものであり、図１は本発明の工具の全体斜視図、図２は図１の工具に装着された切削インサート（以下、インサートと略す。）の概略斜視図、図３は図２のインサートの上面図、図４は図２のインサートをＸ方向から見た側面図、図５は図４の（ａ）Ａ−Ａ断面、（ｂ）Ｂ−Ｂ断面、（ｃ）Ｃ−Ｃ断面を示す断面図、図６は図１（ａ）のホルダへのインサート装着時における（ａ）外周切刃先端部での断面図、（ｂ）外周切刃後端部での断面図、図７は図１（ａ）のホルダ単体の先端拡大図である。   1 to 7 show an example of an embodiment of a milling tool of the present invention (hereinafter abbreviated as a tool). FIG. 1 is an overall perspective view of the tool of the present invention, and FIG. FIG. 3 is a top view of the insert of FIG. 2, FIG. 4 is a side view of the insert of FIG. 2 as viewed from the X direction, and FIG. 5 is FIG. (A) AA cross-section, (b) BB cross-section, (c) Cross-sectional view showing CC cross-section, FIG. 6 is (a) cutting the outer periphery when the insert is attached to the holder of FIG. FIG. 7 is a cross-sectional view at the blade tip, (b) a cross-sectional view at the rear end of the outer peripheral cutting blade, and FIG. 7 is an enlarged view of the tip of the holder unit in FIG.

図１において、工具１は、概略円柱形状のホルダ２の先端部に少なくとも一つのインサート３を装着してなり、ホルダ２の中心軸を中心にホルダ２が回転することによってインサート３にて切削加工を行うものである。図１によれば、ホルダ２の先端部の３箇所にインサートポケット４が形成され、それぞれのインサートポケット４にインサート３が嵌め込まれ固定ネジ６でホルダ２に固定されている。   In FIG. 1, a tool 1 is formed by mounting at least one insert 3 on the tip of a substantially cylindrical holder 2, and the holder 2 rotates around the central axis of the holder 2 to perform cutting work on the insert 3. Is to do. According to FIG. 1, insert pockets 4 are formed at three positions on the tip of the holder 2, and the inserts 3 are fitted into the respective insert pockets 4 and fixed to the holder 2 with fixing screws 6.

一方、インサート３は、平行四辺形形状を基本形状として、底面の着座面８と、上面のすくい面９と、側面の逃げ面１０と、すくい面９および逃げ面１０間の交差稜における長辺部に形成されてホルダ２の外周に位置する外周切刃１２と、外周切刃１２から先端部に続くコーナ切刃１４を対角線上に相対する２つの角部に備えている。さらに、本実施例のインサート３においては、コーナ切刃１４に続く短辺部に底切刃１５が形成され、外周切刃１２と底切刃１５が略直角をなしている。この構成によって、被削材の加工底面とこれに垂直な加工側壁面とを同時に切削する肩加工において加工精度の高い切削加工が可能となる。なお、コーナ切刃１４の曲率半径は、切刃強度と加工形状のバランスから０．４〜６．４ｍｍにて形成される。   On the other hand, the insert 3 has a parallelogram shape as a basic shape, and has a seating surface 8 on the bottom surface, a rake surface 9 on the top surface, a flank surface 10 on the side surface, and a long side at the intersection ridge between the rake surface 9 and the flank surface 10 An outer peripheral cutting edge 12 that is formed on the outer periphery of the holder 2 and a corner cutting edge 14 that extends from the outer peripheral cutting edge 12 to the tip end portion are provided at two opposite corners. Furthermore, in the insert 3 of the present embodiment, a bottom cutting edge 15 is formed on the short side portion following the corner cutting edge 14, and the outer peripheral cutting edge 12 and the bottom cutting edge 15 are substantially perpendicular. With this configuration, it is possible to perform cutting with high processing accuracy in shoulder processing in which the processing bottom surface of the work material and the processing side wall surface perpendicular thereto are simultaneously cut. The radius of curvature of the corner cutting edge 14 is 0.4 to 6.4 mm from the balance between the cutting edge strength and the processed shape.

また、外周切刃１２から続く逃げ面１０Ａが、外周切刃１２に隣接する第一逃げ面１７と、第一逃げ面１７より着座面側に位置する第二逃げ面１８とからなり、第二逃げ面１８が少なくとも３つの区間（２０，２１，２２）に分割され、外周切刃１２の先端部に位置する第二逃げ面２０、および外周切刃１２の後端部に位置する第二逃げ面２２が同一面上に位置して、いずれ（２０，２２）もホルダ２に装着した際の拘束面をなしている。   Further, the flank 10A continuing from the outer peripheral cutting edge 12 includes a first flank 17 adjacent to the outer peripheral cutting edge 12 and a second flank 18 positioned on the seating surface side from the first flank 17; The flank 18 is divided into at least three sections (20, 21, 22), the second flank 20 located at the tip of the outer peripheral cutting edge 12, and the second flank located at the rear end of the outer peripheral cutting edge 12. The surface 22 is located on the same surface, and both (20, 22) are constraining surfaces when the holder 2 is mounted.

また、図５に示すように、第一逃げ面１７と第二逃げ面１８の関係が、コーナ切刃１４側の先端部では第一逃げ面１７の逃げ角βｆ１が第二逃げ面の逃げ角βｆ２に対し小さく設定され、かつコーナ切刃１４から遠ざかる後端部では第一逃げ面の逃げ角βｒ１が前記第二逃げ面の逃げ角βｒ２に対し大きく設定される。上記構成によって、図６に示すように、切削による衝撃がかかり欠損が発生しやすい外周切刃１２先端部におけるホルダ装着時における実質的な逃げ角β’ｆを小さくし、かつ外周切刃１２後端部における実質的な逃げ角β’ｒを大きくして切れ味を向上させることができるとともに、インサート３を容易に製造できてホルダ２への拘束力を精度よく高めることができることから、外周切刃１２先端部に欠損が発生することなく、特に、大きな縦切込みをかけるような切削条件において切れ味が極端に悪くなって境界損傷が発生することなく良好な切削が可能となる。 Further, as shown in FIG. 5, the relationship between the first flank 17 and the second flank 18 is such that the flank angle βf1 of the first flank 17 is the flank of the second flank at the tip on the corner cutting edge 14 side. At the rear end that is set smaller than the angle β f2 and moves away from the corner cutting edge 14, the clearance angle β r1 of the first flank is set larger than the clearance angle β r2 of the second flank. With the above configuration, as shown in FIG. 6, the substantial clearance angle β ′ f at the time of attaching the holder at the front end of the outer peripheral cutting edge 12 that is subject to cutting and is likely to be damaged is reduced, and after the outer peripheral cutting edge 12. Since the substantial clearance angle β ′ r at the end portion can be increased to improve the sharpness, and the insert 3 can be easily manufactured and the restraining force on the holder 2 can be increased with high accuracy, the outer peripheral cutting edge 12 Good cutting can be performed without causing any defects at the tip, particularly under cutting conditions in which a large longitudinal cut is made, and the sharpness becomes extremely poor and no boundary damage occurs.

ここで、外周切刃１２先端部における実質的な逃げ角β’ｆは、外周切刃１２後端部における実質的な逃げ角β’ｒよりも５〜１０°小さくなるように形成されることが切刃強度を維持しつつ切れ味を高める効果が顕著である点で望ましい。 Here, the substantial clearance angle β ′ f at the front end portion of the outer peripheral cutting edge 12 is formed to be 5 to 10 ° smaller than the substantial clearance angle β ′ r at the rear end portion of the outer peripheral cutting edge 12. However, it is desirable in that the effect of enhancing the sharpness while maintaining the cutting edge strength is remarkable.

また、外周切刃１２の先端部に位置する第二逃げ面２０、および外周切刃１２の後端部に位置する第二逃げ面２２が同一平面上に位置して、いずれ（２０，２２）もホルダ２に装着した際の拘束面をなすことから、図７に示すように、第二逃げ面２０，２２と当接されるホルダ２のインサートポケット４の横当接面２５を単純な平面とすることができ、かつ第二逃げ面２０，２２も基準があるために加工精度が高まり取付精度が高く、かつ強固な拘束力が得られるのである。しかも、製造が容易で高精度とでき、安定した品質の工具１を提供することができる。   In addition, the second flank 20 located at the front end of the outer peripheral cutting edge 12 and the second flank 22 located at the rear end of the outer peripheral cutting edge 12 are located on the same plane, and (20, 22) Since this also serves as a restraining surface when mounted on the holder 2, as shown in FIG. 7, the lateral contact surface 25 of the insert pocket 4 of the holder 2 that is in contact with the second flank surfaces 20 and 22 is a simple flat surface. In addition, since the second flank surfaces 20 and 22 have a reference, the processing accuracy is increased, the mounting accuracy is high, and a strong restraining force can be obtained. In addition, the tool 1 can be easily manufactured with high accuracy and can provide a stable quality tool 1.

なお、外周切刃１２の中央部に位置する第二逃げ面２１はインサートポケット４の横当接面２５内に形成された切欠き部２６に収納される。さらに、第一逃げ面１７についても、インサートポケット４の横当接面２５の上部に形成された逃がし部２８に収納されて切削に関与しない外周切刃９ａがホルダ２に接触しない状態となっている。   The second flank 21 positioned at the center of the outer peripheral cutting edge 12 is accommodated in a notch 26 formed in the lateral contact surface 25 of the insert pocket 4. Further, the first flank 17 is also in a state where the outer peripheral cutting edge 9 a that is housed in the escaping portion 28 formed at the upper portion of the lateral contact surface 25 of the insert pocket 4 and does not participate in cutting does not contact the holder 2. Yes.

また、本発明のインサート３において、外周切刃１２からすくい面９に向かうすくい角αは、図５に示すように、外周切刃１２の先端部から後端部にわたってインサート３単体で一定となっており、さらに、外周切刃１２には欠損防止のためにランド部およびホーニング部の境界部３０が形成されている。   In the insert 3 of the present invention, the rake angle α from the outer peripheral cutting edge 12 toward the rake face 9 is constant for the insert 3 alone from the front end portion to the rear end portion of the outer peripheral cutting edge 12, as shown in FIG. Further, the outer peripheral cutting edge 12 is formed with a boundary portion 30 between the land portion and the honing portion in order to prevent breakage.

ここで、図４に示すように、外周切刃１２が、コーナ切刃１４側に同じ高さの先端平坦区間１２Ａと、その後端部に先端から後端に向かって高さが漸減する傾斜区間１２Ｂと、その後端の中央部に同じ高さの後端平坦区間１２Ｃとを備えることが、外周切刃１２の先端部における切刃強度を高めることができるとともに外周切刃１２の後端部に向かう中央部で切削抵抗が増大することを防止でき、さらに、外周切刃１２の後端部においてインサート３を取り扱う際に必要な強度を確保するとともに逃げ面１０Ａのホルダへの拘束面積を確保しかつ外周切刃１２の中央部における傾斜角度をよりきつくして切削抵抗をより低減することにより、欠損や境界損傷、バリ等の発生を抑制できる点で望ましい。   Here, as shown in FIG. 4, the outer peripheral cutting edge 12 has a tip flat section 12A having the same height on the corner cutting edge 14 side, and an inclined section in which the height gradually decreases from the front end to the rear end at the rear end portion. 12B and the rear end flat section 12C having the same height at the center of the rear end can increase the cutting edge strength at the front end of the outer peripheral cutting edge 12 and at the rear end of the outer peripheral cutting edge 12. It is possible to prevent the cutting force from increasing at the center portion toward which it goes, and to secure the necessary strength when handling the insert 3 at the rear end portion of the outer peripheral cutting edge 12 and to secure a constraining area to the holder of the flank 10A. In addition, it is desirable in that generation of defects, boundary damage, burrs, and the like can be suppressed by further reducing the cutting resistance by tightening the inclination angle at the center of the outer peripheral cutting edge 12.

さらに、外周切刃１２の中間に位置する第二逃げ面１８が第一逃げ面１７と同一面にて形成されることが、インサート３の形状を高精度にかつ容易に製造できる点で望ましい。なお、この外周切刃１２の中央部分は成型、焼成時の変形が最も大きくなる部分であり、この部分の形状を単純化することによって成形時の粉末充填の均一性が改善して焼成時の変形を小さくできるという効果もある。   Furthermore, it is desirable that the second flank 18 located in the middle of the outer peripheral cutting edge 12 is formed in the same plane as the first flank 17 in that the shape of the insert 3 can be easily manufactured with high accuracy. The central portion of the outer peripheral cutting edge 12 is the portion where deformation during molding and firing is the largest, and by simplifying the shape of this portion, the uniformity of powder filling during molding is improved, and during firing, There is also an effect that deformation can be reduced.

つまり、図５によれば、インサート３について、コーナ切刃１４の先端部においては第一逃げ面１７と第二逃げ面１８（２０）とのなす角Ｋｆ＜１８０°、中央部においては第一逃げ面１７と第二逃げ面１８（２１）とのなす角Ｋｃ＝１８０°、コーナ切刃１４の後端部においては、第一逃げ面１７と第二逃げ面１８（２２）とのなす角Ｋｒ＞１８０°となっている。 That is, according to FIG. 5, for the insert 3, the angle K f <180 ° between the first flank 17 and the second flank 18 ( 20 ) at the tip of the corner cutting edge 14, and the first at the center. An angle K c = 180 ° formed by the first flank 17 and the second flank 18 ( 21 ), and at the rear end of the corner cutting edge 14, the first flank 17 and the second flank 18 ( 22 ) The formed angle K r > 180 °.

ここで、本発明のインサート３によれば、図３に示すように、外周切刃１２の中央部が上面視で外周方向に膨らんだ形状となっており、ホルダ２に取り付けて回転させたとき外周切刃１２の軌跡が円筒をなすように構成されている。したがって、上記のように外周切刃１２の中央部に続く逃げ面１０Ａを第一逃げ面１７と第二逃げ面１８とが同一面にて構成されることにより、インサート３の形状がより複雑化することを避けて製造が容易で安定することにつながる。   Here, according to the insert 3 of the present invention, as shown in FIG. 3, the central portion of the outer peripheral cutting edge 12 has a shape that swells in the outer peripheral direction when viewed from above, and is attached to the holder 2 and rotated. The trajectory of the outer peripheral cutting edge 12 is configured to form a cylinder. Accordingly, the first flank 17 and the second flank 18 are formed on the same surface in the flank 10A following the central portion of the outer peripheral cutting edge 12 as described above, thereby making the shape of the insert 3 more complicated. Avoiding this leads to easy and stable manufacturing.

また、図２に示すように、すくい面９の長手方向にコーナ切刃１４および外周切刃１２から中央に向かうにつれて一旦低くなった後に***部３１を有するようにチップブレーカが形成されており、切屑がカールしたり分断されて良好に排出される設計となっている。   In addition, as shown in FIG. 2, the chip breaker is formed so as to have a raised portion 31 after being lowered from the corner cutting edge 14 and the outer peripheral cutting edge 12 toward the center in the longitudinal direction of the rake face 9, The design is such that the chips are curled or divided and discharged well.

ここで、本発明によれば、上記インサート３のように、第二逃げ面１８を先端部、中央部、後端部に３分割して（２０、２１、２２）、そのうちの先端部に位置する第二逃げ面２０と後端部に位置する第二逃げ面２２のみを同一平面として設計する方が、製造上、拘束面の寸法精度（平面度）を高められる。 Here, according to the present invention, like the insert 3 , the second flank 18 is divided into three parts (20, 21, 22) at the front end part, the central part, and the rear end part (20, 21, 22). How to design only the second flank 22 located on the second flank 20 and the rear end portion of which a same plane, manufacture, Ru enhanced dimensional accuracy of the constraining surface (flatness).

さらに、図４において底面８は平面となっているが、本発明はこれに限定されるものではなく、例えばいわゆるセレーションと呼ばれる細長く互いが平行に整列した凹凸が繰り返されて縦断面または横断面が波状をなすような構成であってもよい。   Furthermore, although the bottom surface 8 is a flat surface in FIG. 4, the present invention is not limited to this. For example, so-called serrations, which are elongated and unevenly arranged in parallel with each other, are repeated to form a longitudinal section or a transverse section. A wavy configuration may be used.

また、本実施例としては、底切刃１５が備えられたインサート３を例示したが、本発明はこれに限定されるものではなく、例えば、図１のホルダ２のインサート３の後端部に追加的にインサートが設けられたいわゆるヘリカル型のフライス工具において追加的に設けられる底切刃がないインサートに対しても適応可能である。   Moreover, although the insert 3 provided with the bottom cutting edge 15 was illustrated as a present Example, this invention is not limited to this, For example, in the rear-end part of the insert 3 of the holder 2 of FIG. The present invention can also be applied to an insert without a bottom cutting edge additionally provided in a so-called helical type milling tool additionally provided with an insert.

本発明のフライス工具の一例を示す概略斜視図である。It is a schematic perspective view which shows an example of the milling tool of this invention. 図１のフライス工具に装着される切削インサートの概略斜視図である。It is a schematic perspective view of the cutting insert with which the milling tool of FIG. 1 is mounted. 図２の切削インサートの平面図である。It is a top view of the cutting insert of FIG. 図２の切削インサートをＸ方向から見た側面図である。It is the side view which looked at the cutting insert of FIG. 2 from the X direction. 図４の切削インサートの（ａ）Ａ−Ａ断面、（ｂ）Ｂ−Ｂ断面、（ｃ）Ｃ−Ｃ断面を示す概略断面図である。It is a schematic sectional drawing which shows the (a) AA cross section of the cutting insert of FIG. 4, (b) BB cross section, (c) CC cross section. 図１（ａ）のホルダへのインサート装着時における（ａ）外周切刃先端部での断面図、（ｂ）外周切刃後端部での断面図である。It is sectional drawing in the (a) outer periphery cutting blade front-end | tip part at the time of insert mounting | wearing to the holder of FIG. 図１（ａ）のホルダ単体の先端拡大図である。It is the front-end | tip enlarged view of the holder single-piece | unit of Fig.1 (a).

符号の説明Explanation of symbols

１ フライス工具（工具）
２ ホルダ
３ 切削インサート（インサート）
４ インサートポケット
５ ねじ孔
６ 固定ネジ
８ 着座面（底面）
９ すくい面（上面）
１０ 逃げ面（側面）
１０Ａ 外周切刃から続く逃げ面
１２ 外周切刃
１２Ａ 先端平坦区間
１２Ｂ 傾斜区間
１２Ｃ 後端平坦区間
１４ コーナ切刃
１５ 底切刃
１７ 第一逃げ面
１８ 第二逃げ面
２０ 外周切刃の先端部に位置する第二逃げ面
２１ 外周切刃の中央部に位置する第二逃げ面
２２ 外周切刃の後端部に位置する第二逃げ面
２５ インサートポケットの横拘束面
２６ インサートポケットの切欠き部
２８ 逃がし部
３０ 境界部
３１ ***部 1 Milling tool (tool)
2 Holder 3 Cutting insert (insert)
4 Insert pocket 5 Screw hole 6 Fixing screw 8 Seating surface (bottom surface)
9 Rake face (upper surface)
10 Flank (side)
10A The flank 12 that continues from the outer peripheral cutting edge 12 The outer peripheral cutting edge 12A The tip flat section 12B The inclined section 12C The rear end flat section 14 The corner cutting edge 15 The bottom cutting edge 17 The first flank 18 The second flank 20 At the tip of the outer peripheral cutting edge The second flank face 21 The second flank face located at the center of the outer peripheral cutting edge 22 The second flank face 25 located at the rear end of the outer peripheral cutting edge 25 The laterally constraining face 26 of the insert pocket The notch 28 of the insert pocket Relief part 30 Boundary part 31 Raised part

Claims (3)

ホルダの先端部に少なくとも一つの切削インサートを装着してなるフライス工具において、
前記切削インサートが、多角形状を基本形状として、着座面をなす底面と、すくい面をなす上面と、逃げ面をなす側面と、前記すくい面と逃げ面との交差稜線部に形成されて前記ホルダの外周に位置する外周切刃と、前記切削インサートの角部にあって前記外周切刃と接続するコーナ切刃と、を備えており、
前記外周切刃から続く逃げ面は、前記外周切刃に隣接する第一逃げ面と、該第一逃げ面よりも底面側に位置する第二逃げ面と、からなり、
前記第二逃げ面が３つの区間に分割され、前記コーナ切刃側にあって、前記外周切刃の先端部に位置する第二逃げ面と、前記コーナ切刃から遠ざかる側にあって、前記外周切刃の後端部に位置する第二逃げ面と、前記外周切刃の前記先端部と前記後端部との間の中央部に位置する第二逃げ面とからなり、
前記第二逃げ面は、前記外周切刃の前記先端部、前記中央部、および前記後端部の位置において前記第一逃げ面に隣接しており、
前記外周切刃の先端部に位置する第二逃げ面と、前記外周切刃の後端部に位置する第二逃げ面とが同一平面上に位置するとともに、
前記外周切刃の先端部においては第一逃げ面の逃げ角が第二逃げ面の逃げ角に対し小さく、かつ前記外周切刃の後端部においては前記第一逃げ面の逃げ角が前記第二逃げ面の逃げ角に対し大きいフライス工具。 In a milling tool formed by attaching at least one cutting insert to the tip of the holder,
The holder is formed on a polygonal shape as a basic shape at a bottom surface forming a seating surface, a top surface forming a rake surface, a side surface forming a flank surface, and a cross ridge line portion between the rake surface and the flank surface. An outer peripheral cutting edge located on the outer periphery of the cutting insert, and a corner cutting edge connected to the outer peripheral cutting edge at a corner of the cutting insert,
The flank that continues from the outer peripheral cutting edge consists of a first flank adjacent to the outer peripheral cutting edge, and a second flank located on the bottom side of the first flank,
The second flank is divided into three sections, on the corner cutting edge side , on the side of the second flank located at the tip of the outer peripheral cutting edge and away from the corner cutting edge , The second flank located at the rear end of the outer peripheral cutting edge, and the second flank located at the center between the tip and rear end of the outer peripheral cutting edge,
The second flank is adjacent to the first flank at the positions of the front end, the center, and the rear end of the outer peripheral cutting edge,
While the second flank located at the tip of the outer peripheral cutting edge and the second flank located at the rear end of the outer peripheral cutting edge are located on the same plane,
Wherein in the distal portion of the peripheral cutting edge small relief angle of the first flank to the second flank relief angle, and the rear end portion of the outer peripheral cutting edge is the relief angle of the first flank the first two flank face milling tool has the size to the clearance angle. 前記外周切刃は、前記コーナ切刃側に位置するとともに、前記底面からの高さ位置が同じ先端平坦区間と、前記先端平坦区間の後端に位置するとともに、先端から後端に向かって高さが漸減する傾斜区間と、前記傾斜区間の後端に位置するとともに、前記底面からの高さ位置が同じ後端平坦区間とを備える請求項１記載のフライス工具。 The outer peripheral cutting edge is located on the corner cutting edge side, is located at the tip flat section having the same height position from the bottom surface, and is located at the rear end of the tip flat section , and increases from the tip toward the rear end. 2. The milling tool according to claim 1, further comprising an inclined section that gradually decreases, and a rear end flat section that is located at a rear end of the inclined section and has the same height position from the bottom surface . 前記外周切刃の中央部に位置する第二逃げ面は、該第二逃げ面の上部に位置する前記第一逃げ面とのなす角が１８０度である、請求項１または２記載のフライス工具。 Second flank located in the center portion of the outer peripheral cutting edge, the angle between the first flank located on top of said second flank is 180 degrees, according to claim 1 or 2 Tool according .
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JP4991214B2 (en) * 2006-08-30 2012-08-01 京セラ株式会社 Cutting tools
WO2008038805A1 (en) 2006-09-29 2008-04-03 Kyocera Corporation Cutting insert, cutting tool using the same, and cutting method
CN102844139B (en) * 2010-06-30 2013-10-16 京瓷株式会社 Insert and cutting tool, as well as method of manufacturing workpiece which is cut using said insert and cutting tool
JP5906976B2 (en) * 2011-10-04 2016-04-20 三菱マテリアル株式会社 Cutting insert and cutting edge changeable cutting tool
EP3023182B1 (en) * 2014-11-20 2019-11-06 Sandvik Intellectual Property AB A cutting insert for milling square shoulders, a milling cutting tool and a tool body

Citations (2)

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Publication number Priority date Publication date Assignee Title
JPH10506582A (en) * 1995-03-17 1998-06-30 ケンナメタル インコーポレイテッド Spiral cutting inserts with offset cutting edges
JP2004148424A (en) * 2002-10-29 2004-05-27 Kyocera Corp Throw away tip for end mill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10506582A (en) * 1995-03-17 1998-06-30 ケンナメタル インコーポレイテッド Spiral cutting inserts with offset cutting edges
JP2004148424A (en) * 2002-10-29 2004-05-27 Kyocera Corp Throw away tip for end mill

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