JP4722085B2 - Throw away insert and cutting tool using the same - Google Patents

Throw away insert and cutting tool using the same Download PDF

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JP4722085B2
JP4722085B2 JP2007143294A JP2007143294A JP4722085B2 JP 4722085 B2 JP4722085 B2 JP 4722085B2 JP 2007143294 A JP2007143294 A JP 2007143294A JP 2007143294 A JP2007143294 A JP 2007143294A JP 4722085 B2 JP4722085 B2 JP 4722085B2
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protrusion
tip
land
throw
plane
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JP2007216386A (en
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琢也 石田
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Kyocera Corp
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Description

本発明は、鋳鉄や鉄鋼の切削に用いるスローアウェイタイプの切削チップに関するものである。   The present invention relates to a throw-away type cutting tip used for cutting cast iron or steel.

従来、鋳鉄や鉄鋼の切削ではスローアウェイタイプの切削チップが用いられており、中には、切り屑によるすくい面の損傷を防止する目的でチップのすくい面にチップブレーカを形成したものや、切削抵抗による損傷等を防ぐためにすくい面外周部の切刃近傍にランドを設けたもの等、チップのすくい面形状に変化を持たせたチップが知られている。   Conventionally, throw-away type cutting tips are used for cutting cast iron and steel, and some of them have a chip breaker formed on the rake face of the chip for the purpose of preventing damage to the rake face due to chips, or cutting. There are known chips having a change in the shape of the rake face of the chip, such as a land provided in the vicinity of the cutting edge on the outer periphery of the rake face in order to prevent damage due to resistance.

チップブレーカおよびランドを形成した両面使いのスローアウェイチップでは、一般的にチップをひっくり返して用いる際に切刃部がホルダと接触して欠損することを防止するため、図5のようにランド25の高さをすわり面27(すくい面中央部)の高さよりも低くなる(h<0)ように設計される(例えば、特許文献1参照)。   In a throw-away tip for use on both sides formed with a tip breaker and a land, in order to prevent the cutting edge portion from coming into contact with the holder and being lost when the tip is turned upside down, the land 25 as shown in FIG. Is designed to be lower (h <0) than the height of the sliding surface 27 (the center portion of the rake face) (see, for example, Patent Document 1).

しかしながら、上記従来のスローアウェイチップでは、特に衝撃が大きい切削条件で加工すると、チップ21の固定(すわり)に最も影響するチップコーナー部33の高さが低くなってしまうことからチップ21の下面(すわり面)に位置する切刃部24にうきが生じてしまう結果、チップ21のすわりが悪く、切削時に特にチップコーナー部33が振動し、チップ21の下面に位置する切刃部24がホルダの着座面に断続的に衝突して欠損(裏欠け)したり、切削時のチップのビビリ振動によって切削に関与する切刃24にチッピングが発生する恐れがあった。   However, in the above-mentioned conventional throw-away tip, when the machining is performed under a cutting condition with particularly high impact, the height of the tip corner portion 33 that most affects the fixing (sitting) of the tip 21 is lowered, so the lower surface of the tip 21 ( As a result, the cutting edge portion 24 located on the (slipping surface) is creased. As a result, the tip 21 is not satisfactorily, the tip corner portion 33 vibrates particularly during cutting, and the cutting edge portion 24 located on the lower surface of the tip 21 There is a possibility that the seating surface intermittently collides with the chipping surface to cause chipping (back chipping), or chipping occurs in the cutting blade 24 involved in cutting due to chatter vibration of the chip during cutting.

そこで、ランド25と、このランド25と相似形状からなる中央面27とを設けた、いわゆる全周ブレーカにおいて、ランド27と中央面27の高さを同じにしてチップ21のすわりを安定させ、裏欠け防止や切削抵抗を低減させるスローアウェイチップも提案されている(例えば、特許文献2参照)。
特開平8−39306号公報 特開平11−277307号公報
Therefore, in a so-called all-round breaker provided with a land 25 and a central surface 27 having a shape similar to that of the land 25, the height of the land 27 and the central surface 27 is made the same so that the sitting of the chip 21 is stabilized. A throw-away tip that prevents chipping and reduces cutting resistance has also been proposed (see, for example, Patent Document 2).
JP-A-8-39306 Japanese Patent Laid-Open No. 11-277307

しかしながら、この全周ブレーカタイプのチップ21においても、片面の切削に刃先24の欠損やクレータ摩耗によってすくい面のランド25が損傷してしまうと、チップ21を裏返して使用した際にチップ21のすわりに最も影響するコーナー部33のランド25が損傷して接地面とならなくなる結果、すわりの安定性が落ちてしまい、チップ21のうきやびびり等を抑制できずに工具損傷や加工面が粗くなる等の問題点があった。   However, even in this all-round breaker type chip 21, if the lands 25 on the rake face are damaged due to chipping of the cutting edge 24 or crater wear in one-sided cutting, the chip 21 will sit when the chip 21 is turned over. As a result, the land 25 of the corner portion 33 that has the greatest influence on the surface is damaged and does not become a ground contact surface. As a result, the stability of the sitting is lowered, and the tool damage and the machining surface become rough without suppressing the squeezing and chattering of the chip 21. There was a problem such as.

本発明は上記課題を解決するためになされたもので、その目的はチップのすわりを安定させて切削時のチップの振動を防止し、裏欠けや切刃のチッピングを防止でき、使用した面を裏返してすわり面とした場合でもすわりの安定性を高いままに保持できるとともに平滑な仕上げ面が得られるスローアウェイチップを提供することにある。   The present invention has been made to solve the above-mentioned problems, and the purpose thereof is to stabilize the sitting of the chip to prevent chip vibration during cutting, to prevent back chipping and chipping of the cutting edge. An object of the present invention is to provide a throw-away tip that can maintain a high stability of the sitting even when the seat is turned upside down and that can obtain a smooth finished surface.

本発明者は、上記の問題について検討した結果、例え片面の切刃が切削によって欠損した場合であっても、この欠損した切刃近傍がホルダから浮いた状態となることを防止して切削時の振動による裏欠けが発生することを抑制できるとともに、ビビリの発生を防止して切削に関与する切刃の欠損を防止でき、平滑な仕上げ面が得られることを知見した。   As a result of examining the above problem, the present inventor has prevented the vicinity of the missing cutting edge from being lifted from the holder even when the single-sided cutting edge is missing due to cutting. It has been found that the occurrence of back chipping due to vibration of the steel can be suppressed, chattering can be prevented and chipping of the cutting edge involved in cutting can be prevented, and a smooth finished surface can be obtained.

発明のスローアウェイチップは、略平板状のチップ本体を備え、該チップ本体の2つの主面がすくい面と着座面を、側面が逃げ面をなし、前記両主面と前記逃げ面との交差部に切刃を有する両面使用可能なスローアウェイチップにおいて、前記各主面は、周縁部に前記切刃と連なるランド面と、前記各主面のコーナーに向かって伸びる第1突起部と、該第1突起部が向かうコーナーと隣り合うコーナーとの間に向かって伸びる第2突起部とを有し、前記ランド面と前記第1突起部および第2突起部の頂面が同一高さであるとともに、前記ランド面と前記第1突起部との間には凹部が形成されており、該凹部は、前記ランド面側R1面と、該R1面に連続するR2面と、該R2面に連続するとともに中央面側のR3面との3つのR面にて形成されるとともに、前記R1面の曲率半径:r1および前記R2面の曲率半径:r2および前記R3面の曲率半径:r3が、r3>r1>r2であることを特徴とする。
本発明の他のスローアウェイチップは、略平板状のチップ本体を備え、該チップ本体の2つの主面がすくい面と着座面を、側面が逃げ面をなし、前記両主面と前記逃げ面との交差部に切刃を有する両面使用可能なスローアウェイチップにおいて、前記各主面は、周縁部に前記切刃と連なるランド面と、前記各主面のコーナーに向かって伸びる第1突起部と、該第1突起部が向かうコーナーと隣り合うコーナーとの間に向かって伸びる第2突起部とを有し、前記ランド面と前記第1突起部および第2突起部の頂面が設置面になるととも
に、前記ランド面と前記第1突起部との間には凹部が形成されており、該凹部は、前記ランド面側R1面と、該R1面に連続するR2面と、該R2面に連続するとともに中央面側のR3面との3つのR面にて形成されるとともに、前記R1面の曲率半径:r1および前記R2面の曲率半径:r2および前記R3面の曲率半径:r3が、r3>r1>r2であることを特徴とする。
The throw-away tip of the present invention comprises a substantially flat tip body, the two main surfaces of the tip body are a rake surface and a seating surface, the side surfaces are flank surfaces, and the two main surfaces and the flank surfaces are In the throw-away tip that can be used on both sides having a cutting edge at the intersecting portion, each main surface has a land surface that is continuous with the cutting edge at a peripheral portion, and a first protrusion that extends toward a corner of each main surface, A second protrusion extending between a corner toward which the first protrusion is directed and an adjacent corner, and the land surface and the top surfaces of the first protrusion and the second protrusion are at the same height. In addition , a recess is formed between the land surface and the first protrusion, and the recess is formed on the land surface side R1 surface, the R2 surface continuous to the R1 surface, and the R2 surface. Consisting of three R surfaces with the central surface side R3 surface Together are the R1 surface of the curvature radius: r1 and the surface R2 of the curvature radius: r2 and the R3 side of the curvature radius: r3, characterized in that it is r3>r1> r2.
Another throw-away tip of the present invention includes a substantially flat tip body, the two main surfaces of the tip body are a rake face and a seating surface, the side faces are flank faces, and both the main face and the flank face are provided. In each of the throw-away tips having a cutting edge at the intersection with each other, each main surface has a land surface connected to the cutting edge at a peripheral portion and a first protrusion extending toward a corner of each main surface And a second projecting portion extending between a corner to which the first projecting portion is directed and an adjacent corner, and the land surface and the top surfaces of the first and second projecting portions are installation surfaces. To become
Further, a recess is formed between the land surface and the first protrusion, and the recess is continuous to the land surface side R1 surface, the R2 surface continuous to the R1 surface, and the R2 surface. In addition, it is formed by three R surfaces with the R3 surface on the center surface side, and the radius of curvature of the R1 surface: r1 and the radius of curvature of the R2 surface: r2 and the radius of curvature of the R3 surface: r3 are r3. >R1> r2.

また、前記切刃は、前記ランド面、前記第1突起部の頂面および第2突起部の頂面よりも高さが低いことが好ましい。  Moreover, it is preferable that the said cutting blade is lower than the land surface, the top surface of the said 1st projection part, and the top surface of a 2nd projection part.
また、前記第1突起部頂面の先端から前記ランド面までの距離は、前記第2突起部頂面の先端から前記ランド面までの距離よりも大きいことが好ましい。  Moreover, it is preferable that the distance from the front-end | tip of the said 1st protrusion part to the said land surface is larger than the distance from the front-end | tip of the said 2nd protrusion part top surface to the said land surface.
また、前記第1突起部または前記第2突起部の頂面の先端の角度を鋭角としたことが好ましい。  Moreover, it is preferable that the angle of the tip of the top surface of the first protrusion or the second protrusion is an acute angle.
また、前記スローアウェイチップの中心からチップ周縁部までの長さL1に対する前記スローアウェイチップの中心から前記第1突起部または前記第2突起部の先端までの長さL2の比(L2/L1)が0.7〜0.95であることが好ましい。  The ratio of the length L2 from the center of the throwaway tip to the tip of the first projection or the second projection (L2 / L1) with respect to the length L1 from the center of the throwaway tip to the peripheral edge of the tip Is preferably 0.7 to 0.95.
また、前記第1突起部または前記第2突起部の前記中央面と同じ高さに位置する先端と前記ランド面との距離が0.5mm以下であり、かつ前記第1突起部または前記第2突起部の先端の高さが前記ランド面に向かって10〜60度の角度で傾斜しつつ減じていることが好ましい。  Further, the distance between the tip of the first protrusion or the second protrusion and the land surface at the same height as the central surface is 0.5 mm or less, and the first protrusion or the second protrusion. It is preferable that the height of the tip of the protrusion is reduced while being inclined at an angle of 10 to 60 degrees toward the land surface.

本発明の他のスローアウェイチップは、略平板状のチップ本体を備え、該チップ本体の2つの主面がすくい面と着座面を、側面が逃げ面をなし、前記両主面と前記逃げ面との交差部に切刃を有する両面使用可能なスローアウェイチップにおいて、前記各主面は、周縁部に前記切刃と連なるランド面と、前記各主面のコーナーに向かって伸びる第1突起部とを有し、前記ランド面と前記第1突起部の頂面が同一高さであるとともに、前記切刃は、前記ランド面および前記第1突起部の頂面よりも高さが低く、前記ランド面と前記第1突起部との間には凹部が形成されており、該凹部は、前記ランド面側R1面と、該R1面に連続するR2面と、該R2面に連続するとともに中央面側のR3面との3つのR面にて形成されるとともに、前記R1面の曲率半径:r1および前記R2面の曲率半径:r2および前記R3面の曲率半径:r3が、r3>r1>r2であることを特徴とする。  Another throw-away tip of the present invention includes a substantially flat tip body, the two main surfaces of the tip body are a rake face and a seating surface, the side faces are flank faces, and both the main face and the flank face In each of the throw-away tips having a cutting edge at the intersection with each other, each main surface has a land surface connected to the cutting edge at a peripheral portion and a first protrusion extending toward a corner of each main surface The land surface and the top surface of the first protrusion are the same height, and the cutting edge is lower in height than the land surface and the top surface of the first protrusion, A recess is formed between the land surface and the first protrusion, and the recess is connected to the land surface side R1 surface, the R2 surface continuous to the R1 surface, the R2 surface, and the center. The R1 surface is formed by three R surfaces with the R3 surface on the surface side. Curvature radius: r1 and the surface R2 of the curvature radius: r2 and the R3 side of the curvature radius: r3, characterized in that it is r3> r1> r2.
本発明の他のスローアウェイチップは、略平板状のチップ本体を備え、該チップ本体の2つの主面がすくい面と着座面を、側面が逃げ面をなし、前記両主面と前記逃げ面との交差部に切刃を有する両面使用可能なスローアウェイチップにおいて、前記各主面は、周縁部に前記切刃と連なるランド面と、前記各主面のコーナーに向かって伸びる第1突起部とを有し、前記ランド面と前記第1突起部の頂面が設置面になるとともに、前記切刃は、前記ランド面および前記第1突起部の頂面よりも高さが低く、前記ランド面と前記第1突起部との間には凹部が形成されており、該凹部は、前記ランド面側R1面と、該R1面に連続するR2面と、該R2面に連続するとともに中央面側のR3面との3つのR面にて形成  Another throw-away tip of the present invention includes a substantially flat tip body, the two main surfaces of the tip body are a rake face and a seating surface, the side faces are flank faces, and both the main face and the flank face In each of the throw-away tips having a cutting edge at the intersection with each other, each main surface has a land surface connected to the cutting edge at a peripheral portion and a first protrusion extending toward a corner of each main surface And the land surface and the top surface of the first projecting portion become an installation surface, and the cutting edge is lower in height than the land surface and the top surface of the first projecting portion, A concave portion is formed between the surface and the first protrusion, and the concave portion is formed on the land surface side R1 surface, the R2 surface continuous with the R1 surface, and the central surface with the R2 surface. Formed by three R surfaces with the side R3 surface
されるとともに、前記R1面の曲率半径:r1および前記R2面の曲率半径:r2および前記R3面の曲率半径:r3が、r3>r1>r2であることを特徴とする。In addition, the curvature radius of the R1 surface: r1 and the curvature radius of the R2 surface: r2 and the curvature radius of the R3 surface: r3 satisfy r3> r1> r2.

また、前記第1突起部の頂面の先端の角度を鋭角としたことが好ましい。
また、前記スローアウェイチップの中心からチップ周縁部までの長さL1に対する前記スローアウェイチップの中心から前記第1突起部の先端までの長さL2の比(L2/L1)が0.7〜0.95であることが好ましい。
また、前記第1突起部のうち前記中央面と同じ高さに位置する先端と前記ランド面との距離が0.5mm以下であり、かつ前記第1突起部の先端の高さが前記ランド面に向かって10〜60度の角度で傾斜しつつ減じていることが好ましい。
また、平面視において前記チップ本体が四角形をなすことが好ましい。
また、前記ランド面の幅が0.2〜0.5mmであることが好ましい。
また、前記主面における前記中央面および前記ランド面の面積比率が50〜90%であることが好ましい。
本発明の切削工具は、前記スローアウェイチップと、前記スローアウェイチップを、前記ランド面、前記突起部の頂面を設置面として装着するホルダと、を備えることを特徴とする。
Moreover, it is preferable that the angle of the tip of the top surface of the first protrusion is an acute angle.
Further, the ratio (L2 / L1) of the length L2 from the center of the throw-away tip to the tip of the first projecting portion with respect to the length L1 from the center of the throw-away tip to the peripheral edge of the tip is 0.7-0. .95 is preferred.
In addition, a distance between the tip of the first protrusion and the land surface at the same height as the central surface is 0.5 mm or less, and the height of the tip of the first protrusion is the land surface. It is preferable to decrease while inclining at an angle of 10 to 60 degrees toward.
Further, it is preferable that the chip body has a quadrangular shape in plan view.
Moreover, it is preferable that the width of the land surface is 0.2 to 0.5 mm.
Moreover, it is preferable that the area ratio of the said center surface in the said main surface and the said land surface is 50 to 90%.
The cutting tool of this invention is equipped with the said throw-away tip, and the holder which mounts | wears with the said throw-away tip by using the said land surface and the top surface of the said projection part as an installation surface.

本発明に係るスローアウェイチップでは、チップのすわり面が端部まで安定し、切削に関与する切刃の裏側に位置する切刃がホルダから浮いた状態となることを防止して切削時の振動による裏欠けが発生することを抑制できるとともに、すわり面の拘束力を高めてビビリの発生を防止して切削に関与する切刃の欠損を防止でき、かつ、使用した面を裏返してすわり面とした場合でもすわりの安定性を高いままに保持できるとともに平滑な仕上げ面が得られる。   In the throw-away tip according to the present invention, the sliding surface of the tip is stabilized to the end, and the cutting edge located on the back side of the cutting edge involved in cutting is prevented from being lifted from the holder, and vibration during cutting is prevented. It is possible to suppress the occurrence of chipping from the back, and to prevent the occurrence of chatter by increasing the restraining force of the sitting surface and to prevent the cutting blades involved in cutting from being lost. In this case, the stability of the sitting can be kept high and a smooth finished surface can be obtained.

本発明の切削スローアウェイチップ(以下単にチップと呼ぶ)について、図1の平面図(a)と、側面図(b)を用いて説明する。図1によれば、チップ1は略平板状の多角形からなり、すくい面および着座面を形成する主面2と側面に逃げ面3を有し、逃げ面3と主面2との交点に切刃4(切削に関与する切刃4a、着座面に位置する切刃4b)を有する。さらに、主面2の周縁部に着座面と厚み方向に平行で、かつ平坦なランド面5を有し、また、チップ1の主面2の中央部に着座面と厚み方向に平行で、かつ平坦な中央面7を有するとともに、ランド面5と中央面7の間にブレーカとして機能する凹部6を設けている。   A cutting throw-away tip (hereinafter simply referred to as a tip) of the present invention will be described with reference to a plan view (a) and a side view (b) of FIG. According to FIG. 1, the chip 1 has a substantially flat polygonal shape, and has a main surface 2 that forms a rake face and a seating surface, and a flank 3 on the side surface, and an intersection of the flank 3 and the main surface 2. It has a cutting edge 4 (a cutting edge 4a involved in cutting, a cutting edge 4b located on the seating surface). Further, the peripheral surface of the main surface 2 has a flat land surface 5 parallel to the seating surface and in the thickness direction, and parallel to the seating surface and thickness direction in the central portion of the main surface 2 of the chip 1. A concave center 6 is provided between the land surface 5 and the central surface 7 and functions as a breaker.

本発明によれば、中央面7にランド面5に向かって伸びる1つ以上の突起部8を設けるとともに、ランド面5の高さと、中央面7の少なくとも突起部8の頂面の高さとを同じとすることが大きな特徴であり、このようにすることでランド面5が接地面(すわり面)となり、チップ1の特にホルダと接する(着座面)切刃4b部のすわりの安定性が向上し、切削時に切刃4b部分にうきによるびびりや裏欠けが発生することを防ぐことができる。また、ランド面5のみでチップ1を支えてしまうと、ランド面5が切削による負荷でかけた場合、チップ1のすわりが不安定になるが、ランド面5とともに中央面7の中ですくなくとも突起部8の頂面もすわり面とすることでランド面5にかかる切削の負荷を低減でき、かつ、よりチップ1の外側ですわりを得ることができるため、チップ1のすわりが安定し、チップ1のうきを抑制することができる。   According to the present invention, the center surface 7 is provided with one or more protrusions 8 extending toward the land surface 5, and the height of the land surface 5 and the height of the top surface of at least the protrusion 8 of the center surface 7 are determined. The same feature is a major feature. By doing so, the land surface 5 becomes a ground contact surface (sitting surface), and the stability of the sitting edge 4b of the chip 1 that is in contact with the holder (sitting surface) is improved. In addition, it is possible to prevent chatter and back chipping from occurring at the cutting edge 4b during cutting. Further, if the chip 1 is supported only by the land surface 5, when the land surface 5 is applied by a load due to cutting, the sitting of the chip 1 becomes unstable. Since the top surface of 8 is also a sliding surface, the cutting load applied to the land surface 5 can be reduced and the sliding can be obtained on the outside of the chip 1, so that the sitting of the chip 1 is stable, Can suppress squealing.

すなわち、ランド面5が突起部8よりも低い位置にあると切削時にチップ1のうきが発生してしまい、チップ1の接地面側の切刃や中央面が断続的な衝撃を受けて裏欠けや欠損の原因となってしまう。他方、ランド面5が突起部8よりも高い位置にあると、すわりは安定し、うきの発生を抑えることができる反面、切削時の負荷がランド面5に集中してしまい、裏欠けや欠損を引き起こしてしまう。   In other words, if the land surface 5 is lower than the protrusion 8, the chip 1 is eroded during cutting, and the cutting edge and the central surface of the chip 1 on the ground surface side are intermittently impacted and chipped back. Or cause loss. On the other hand, if the land surface 5 is higher than the protrusion 8, the sitting is stable and the occurrence of squeezing can be suppressed. On the other hand, the load during cutting is concentrated on the land surface 5, resulting in chipping or chipping. Will cause.

また、切削時の摩耗や欠損等によってランド面5が損傷してしまうため、チップ1を裏返して使用した際に刃先4のランド面5が接地面とならなくなる。そのため、切削によって刃先4に荷重がかかると、刃先4の下の接地面が無いためすわりが安定せずにうきやびびりが発生してしまう。そこで、突起部8を設けるとすわり面がランド面5により近い位置にあるため、ランド面5が損傷した場合でもすわりの安定性を保持することができる効果もある。   Further, since the land surface 5 is damaged due to wear or chipping during cutting, the land surface 5 of the cutting edge 4 does not become a ground contact surface when the chip 1 is turned upside down. Therefore, when a load is applied to the blade edge 4 by cutting, there is no ground contact surface under the blade edge 4, so that the sitting is not stable and chattering occurs. Therefore, when the protrusion 8 is provided, the sitting surface is closer to the land surface 5, so that there is an effect that the stability of the sitting can be maintained even when the land surface 5 is damaged.

なお、ランド面5と突起部8の高さを同じにするには、あらかじめランド面5と突起部8をともに設定値よりも高くなるように調整した焼結体を作製し、ランド面5と突起部8に同時に研削加工を施すことによってランド面5と突起部8の高さを調整可能である。また、ランド面5の高さと突起部8の高さが加工ばらつきによって0.05mm以下の差が生じた場合であっても本発明の効果は失われない。   In order to make the land surface 5 and the protrusion 8 have the same height, a sintered body in which both the land surface 5 and the protrusion 8 are adjusted in advance to be higher than a set value is prepared. It is possible to adjust the height of the land surface 5 and the protrusion 8 by grinding the protrusion 8 simultaneously. Even if the difference between the height of the land surface 5 and the height of the protrusion 8 is 0.05 mm or less due to processing variations, the effect of the present invention is not lost.

さらに、切削に影響しない程度にチップ1の外側に突起部8を複数配置することでチップ1のすわりをより向上することができる。そこで、突起部8の先端を図2に示すように、チップ1を平面視したときの角度αを鋭角、特に60°以下とすることが、より多くの突起部8をチップ1のランド面5付近に配置できるため望ましい。   Furthermore, the sitting of the chip 1 can be further improved by arranging a plurality of protrusions 8 on the outer side of the chip 1 so as not to affect the cutting. Therefore, as shown in FIG. 2, when the tip 1 of the chip 1 is viewed in plan, the angle α when the chip 1 is viewed in plan is set to an acute angle, particularly 60 ° or less. This is desirable because it can be placed nearby.

また、スローアウェイチップ1の突起部8の一つがスローアウェイチップ1のコーナー13に向かって伸び、かつ、2つのコーナー13の間に向かって伸びる1つ以上の突起部8を有することが望ましい。コーナー13に向かう突起部8がすわりとなるとともにブレーカの効果をもつため、切り屑の排出方向を一定にすることができ、切削抵抗の低減することができる。さらに、コーナー13とコーナー13の間にもひとつ以上の突起部8を設けることですわりの安定性がより向上する。   It is desirable that one of the protrusions 8 of the throw-away tip 1 extends toward the corner 13 of the throw-away tip 1 and has one or more protrusions 8 extending between the two corners 13. Since the projecting portion 8 toward the corner 13 is seated and has the effect of a breaker, the chip discharge direction can be made constant and the cutting resistance can be reduced. Furthermore, providing one or more protrusions 8 between the corners 13 and 13 improves the stability of the chair.

なお、チップ1の中心からチップ周縁部までの長さL1に対するチップ1の中心から突起部8の先端までの長さL2の比(L2/L1)が0.7〜0.95であることが、チップ1の着座面においてランド面5に欠損や加工ばらつきによるランド面5と中央面7との高さずれが発生した場合においても、チップ1、特に着座面の座り安定性を維持できる点で望ましい。すなわち、0.7以下であれば、ランド面5に欠損が発生したときに不安定となり、0.95以上であれば加工ばらつきでランド面5と中央面7との高さのずれが発生したときに不安定となる。 Note that the ratio (L 2 / L 1 ) of the length L 2 from the center of the chip 1 to the tip of the protrusion 8 to the length L 1 from the center of the chip 1 to the peripheral edge of the chip is 0.7 to 0.95. Therefore, even when the land surface 5 on the seating surface of the chip 1 has a height shift between the land surface 5 and the center surface 7 due to chipping or processing variations, the sitting stability of the chip 1, particularly the seating surface, is improved. This is desirable because it can be maintained. That is, if it is 0.7 or less, it becomes unstable when a defect occurs on the land surface 5, and if it is 0.95 or more, the height deviation between the land surface 5 and the center surface 7 occurs due to processing variation. Sometimes it becomes unstable.

なお、図1によれば、チップ1の中央には取付孔9が形成され、この取付孔9にボルト等(不図示)を螺合してネジ止め固定する構造となっているが、本発明はこれに限定されるものではなく、ネジを用いない、いわゆるクランプオン方式の固定であってもよい。   According to FIG. 1, a mounting hole 9 is formed in the center of the chip 1, and a bolt or the like (not shown) is screwed into the mounting hole 9 and fixed with screws. Is not limited to this, and may be a so-called clamp-on type fixing without using a screw.

さらに、ランド面5の幅を0.2〜0.5mmとすることが切刃の強度、およびチップ1の着座面(接地面)におけるすわりの安定性を高めて裏欠けに対する強度を高めるとともに、切り屑の排出性の向上や切削抵抗の増大防止により欠損およびチッピングを防止する点で望ましい。   Furthermore, the width of the land surface 5 is set to 0.2 to 0.5 mm to increase the strength of the cutting edge and the stability of the sitting on the seating surface (grounding surface) of the chip 1 to increase the strength against the back chip, This is desirable in terms of preventing chipping and chipping by improving chip discharge and preventing cutting resistance from increasing.

また、チップ1の要部拡大断面図である図2に示すように、本発明によればランド面5と中央面7の間にある凹部8を、ランド面5側のR1面10と、R1面10に連続し、図3では凹部6の底面に位置するR2面11と、R2面に連続する中央面側のR3面12との3つのR面からなることが切削抵抗を低減し、耐欠損性を向上させ、切り屑の排出をスムーズにし、切り屑のつまり等による損傷を防ぐブレーカとしての効果に加えて、すわりとなる中央面7および突起部8の面積を確保する点で望ましい。 Further, as shown in FIG. 2 which is an enlarged cross-sectional view of the main part of the chip 1, according to the present invention, the concave portion 8 between the land surface 5 and the central surface 7 is formed with an R 1 surface 10 on the land surface 5 side, The cutting resistance is composed of three R surfaces, namely, an R 2 surface 11 that is continuous to the R 1 surface 10 and in FIG. 3 is located on the bottom surface of the recess 6 and an R 3 surface 12 that is continuous with the R 2 surface. In addition to the effect as a breaker that improves chipping resistance, improves chipping resistance, prevents chipping damage, etc., and secures the area of the central surface 7 and the protrusion 8 This is desirable.

ここで、上記凹部6の望ましい寸法は、切削抵抗を低減する点でR1面10の曲率半径を15〜17mm、切屑の流れを損なわず、凹部6(ブレーカ)の長さを短くしてすわりを確保する点でR2面11の曲率半径を1〜2mm、望ましくは1〜1.5mmとし、さらには切り屑をスムーズに排出し、切り屑のつまりによる工具損傷を防ぐ点でR3面12の曲率半径を22〜24mmとすることが望ましい。 Here, the desirable dimension of the concave portion 6 is that the radius of curvature of the R 1 surface 10 is 15 to 17 mm in terms of reducing cutting resistance, and the length of the concave portion 6 (breaker) is shortened without impairing the flow of chips. 1~2mm the radius of curvature of R 2 surface 11 at a point to ensure, preferably a 1-1.5 mm, further ejects the chips smoothly, R 3 faces in terms of preventing tool damage clogging of the chip The radius of curvature of 12 is desirably 22 to 24 mm.

また、切刃4はシャープエッジでもよいが、切刃4の刃先強度が増し、さらに切削抵抗を低減することができるため、刃先4のチッピングおよび欠損を防ぐことができる点で切刃4にC面またはR面加工を施すことが望ましい。   The cutting edge 4 may be a sharp edge. However, since the cutting edge 4 has increased edge strength and can reduce cutting resistance, the cutting edge 4 can be prevented from chipping and chipping. It is desirable to perform surface or R surface processing.

さらに、本発明によれば、図1に示すように、主面2における中央面7およびランド面5、すなわち接地面の面積比率が50〜90%であることが、すわりを安定させ、うきやびびりの発生を抑えて裏欠けやチッピングを防ぐ点で望ましい。   Furthermore, according to the present invention, as shown in FIG. 1, the area ratio of the central surface 7 and the land surface 5 in the main surface 2, that is, the ground contact surface is 50 to 90%, which stabilizes the sitting and This is desirable because it prevents chattering and prevents chipping and chipping.

また、突出部8の中央面7と同じ高さに位置する先端8aとランド面5との距離を0.5mm以下とし、かつ図4に示すように突起部先端8aの高さがランド面5に向かって10〜60度の角度でチップ1の厚み方向に傾斜しつつ減じていることが望ましく、これによって、主面を研磨加工するにつれてランド面5と突起部8の先端との間隔が狭まることを目視で確認できることから、作業者がランド面5と突起部先端8aとの間隔を目視で確認することによって研磨加工状態を容易に確認でき、加工時の並行度のばらつきを防止することができる。   Further, the distance between the tip 8a located at the same height as the central surface 7 of the protrusion 8 and the land surface 5 is 0.5 mm or less, and the height of the protrusion 8a is the land surface 5 as shown in FIG. It is desirable that the distance between the land surface 5 and the tip of the protrusion 8 is reduced as the main surface is polished. Since this can be confirmed visually, the operator can easily confirm the polishing state by visually confirming the distance between the land surface 5 and the protrusion tip 8a, and can prevent variations in parallelism during processing. it can.

(実施例)
WC粉末に対してCoを11重量%添加した混合粉末を、プレス成形で図1および表1に示す型式、平面形状で刃先を1面に2つの計4つになるように成形し、真空焼成した後、試料No.1〜6については焼結体の両主面の中央面およびランド面を研磨して同じ高さに調整した。なお、試料No.1〜6、8〜11については、対向するコーナー部同士で中央面の突起形状を対称な形状にするとともに、先端に45度の傾斜を設け、中央面の突起部先端とランド面との隙間(w)を0.2mmに設定することによって、目視によって研磨加工の平行度のバラツキを確認することができた。なお、試料No.7はブレーカを設けない従来の形状であり、試料No.8、9はランド面が突起部の高さより低い従来の形状であり、試料No.10、11はランド面が突起部の高さより高い従来の形状であり、試料No.12はランド部と中央面の高さが同じで中央面に突起部がない従来の形状である。
(Example)
A powder mixture containing 11% by weight of Co with respect to the WC powder is molded by press molding so that there are a total of four blade tips on the surface of the model shown in FIG. Sample No. About 1-6, the center surface and land surface of both the main surfaces of a sintered compact were grind | polished, and it adjusted to the same height. Sample No. About 1-6, 8-11, while making the protrusion shape of a center plane into symmetrical shape between opposing corner parts, providing 45 degrees inclination at the front-end | tip, the clearance gap between a front-end | tip protrusion part and a land surface By setting (w) to 0.2 mm, it was possible to visually confirm the variation in the parallelism of the polishing process. Sample No. 7 is a conventional shape without a breaker. Nos. 8 and 9 are conventional shapes in which the land surface is lower than the height of the protrusion. 10 and 11 are conventional shapes in which the land surface is higher than the height of the protrusion. Reference numeral 12 denotes a conventional shape in which the land portion and the central surface have the same height and the central surface has no protrusion.

また、すべての試料にはランド面の周縁部にホーニング処理(刃先処理)を施した後、CVD法によって焼結体表面にTiCN−Al23−TiNからなる硬質膜を順にコーティングして試料No.1〜11のスローアウェイチップを作製した。 In addition, all samples were subjected to honing treatment (blade edge treatment) on the peripheral portion of the land surface, and then a hard film made of TiCN—Al 2 O 3 —TiN was sequentially coated on the sintered body surface by a CVD method. No. 1 to 11 throwaway tips were produced.

得られたチップについて、チップを平板の上に置いたときの周縁部(ランド面の周縁端)と平板との隙間の最大値(h)、中央面の突起部先端の位置(L2/L1の平均値)を測定し表1に示した。 For the obtained chip, the maximum value (h) of the gap between the peripheral edge (the peripheral edge of the land surface) and the flat plate when the chip is placed on the flat plate, the position of the tip of the protrusion on the central surface (L 2 / L The average value of 1 ) was measured and shown in Table 1.

また、得られたチップを用いて以下の条件での切削試験を行い、測定器を用いて切削時のうきの測定を行い、チップが欠損に至るまでの切削時間、被削材の加工面状態の観察を行った。また、切削試験は1つの試料につき、図1(b)の刃先4a1、4a2で行った後、裏返して刃先4b1、4b2で行った。結果は表2に示した。 In addition, a cutting test is performed using the obtained insert under the following conditions, a measurement is performed using a measuring instrument, a cutting time until the insert is damaged, and a work surface state of the work material. Was observed. Further, the cutting test was performed for each sample with the cutting edges 4a 1 and 4a 2 of FIG. 1B, and then turned over and performed with the cutting edges 4b 1 and 4b 2 . The results are shown in Table 2.

切削条件
切削速度:250m/min
切込み :4mm
送り :0.35mm/rev
被削材 :FC250 4本溝つき
切削状態:乾式

Figure 0004722085
Figure 0004722085
Cutting conditions Cutting speed: 250 m / min
Cutting depth: 4mm
Feeding: 0.35mm / rev
Work material: FC250 with 4 grooves Cutting condition: Dry
Figure 0004722085
Figure 0004722085

表2より、ランド面と中央面のすくなくとも突起部を同じ高さ(h≦0.05mm)とした試料No.1〜6では、刃先4a1、4a2、4b1、4b2すべての切刃において切削時におけるチップ周縁部のうきが10μm以下であり、切削寿命が300秒以上と長く、また、切刃以外の部位での欠損等の裏欠けおよび切削している切刃部分のチッピングも無く、優れた耐欠損性を示した。また、被削材の加工面を観察した結果、一様に滑らかな加工面となっていた。 From Table 2, sample No. 1 having at least the protrusions on the land surface and the center surface having the same height (h ≦ 0.05 mm). 1-6, the cutting edge peripheral edge at the time of cutting is 10 μm or less in all cutting edges 4a 1 , 4a 2 , 4b 1 , 4b 2 , and the cutting life is as long as 300 seconds or longer. There was no back chipping such as chipping at the part and chipping of the cutting edge part being cut, and excellent chipping resistance was shown. Further, as a result of observing the machined surface of the work material, the machined surface was uniformly smooth.

これに対して、ブレーカを設けなかった試料No.7では、被削材の加工面が粗雑であった。   On the other hand, sample no. In No. 7, the processed surface of the work material was rough.

また、ランド面が突起部の高さより低い試料No.8、9では、うきが50μm以上と大きく発生し、裏欠けが発生してしまい、かつ早期に切刃の欠損が発生して耐欠損性が悪かった。また、びびりによって加工面の面状態も悪くなった。   In addition, sample No. whose land surface is lower than the height of the protrusions. In Nos. 8 and 9, the swell was as large as 50 μm or more, chipping occurred on the back, and chipping of the cutting edge occurred early, resulting in poor chipping resistance. In addition, the surface condition of the machined surface deteriorated due to chatter.

さらに、ランド面が突起部の高さより高い試料No.10、11では、うきの発生が小さいながらも発生し、ランド面に裏欠けが発生してしまった。そのため、びびりが発生し、切刃の欠損が早期に発生してしまい、被削材の加工面も悪かった。   Further, the sample No. whose land surface is higher than the height of the protruding portion. In Nos. 10 and 11, although the occurrence of swell was small, the back face was chipped on the land surface. For this reason, chattering occurred, chipping of the cutting edge occurred early, and the work surface of the work material was also poor.

また、中央面に突起部を設けず、ランド部と中央面の高さを同じとした試料No.12では、刃先4a1、4a2の切削試験においてはうきも発生せず、切削時間も300秒程度と長かった。しかしながら、刃先4a1、4a2での切削試験後に行う刃先4b1、4b2での切削試験は、先に行った切削試験によって刃先4a1、4a2のランド部が損傷し、接地面とならなかったため、うきが発生してしまい、切削時間も刃先4a1、4a2よりも短くなり、加工面もやや粗雑なものとなった。
In addition, the sample No. 1 was not provided with a protrusion on the central surface, and the land and the central surface had the same height. In No. 12, no cutting occurred in the cutting test of the cutting edges 4a 1 and 4a 2 , and the cutting time was as long as about 300 seconds. However, cutting test in the cutting edge 4b 1, 4b 2 performed after the cutting test at the cutting edge 4a 1, 4a 2, the land portion of the blade edge 4a 1, 4a 2 is damaged by the cutting tests performed earlier, if the ground plane As a result, erosion occurred, the cutting time was shorter than the cutting edges 4a 1 and 4a 2 , and the machined surface was somewhat rough.

本発明のスローアウェイチップの例を示した概略図であり、(a)は概略平面図、(b)は概略側面図である。It is the schematic which showed the example of the throw away tip of this invention, (a) is a schematic plan view, (b) is a schematic side view. 図1のスローアウェイチップの部分拡大平面図である。FIG. 2 is a partially enlarged plan view of the throw-away tip in FIG. 1. 図1(b)中のA部の拡大断面概略図である。FIG. 2 is an enlarged schematic cross-sectional view of a portion A in FIG. 図1(a)中のB−B拡大断面概略図である。It is a BB expanded sectional schematic diagram in Drawing 1 (a). 従来のスローアウェイチップの要部拡大断面図であり、(a)は要部拡大断面図、(b)は平面図である。It is a principal part expanded sectional view of the conventional throwaway tip, (a) is a principal part expanded sectional view, (b) is a top view.

符号の説明Explanation of symbols

1:スローアウェイチップ
2:主面
3:逃げ面
4:切刃
4a1、a2:切削に関与する切刃
4b1、b2:ホルダと接する(着座面)切刃
5:ランド面
6:凹部
7:中央面
8:突起部
8a:突起部先端
9:取付け孔
10:先端側のR面(R1
11:R底面(R2
12:中央面側のR面(R3
h:ランド面と中央面の高さの差
1: Throw-away tip 2: Main surface 3: Flank surface 4: Cutting blades 4a 1 , a 2 : Cutting blades involved in cutting 4b 1 , b 2 : Cutting blades in contact with the holder (sitting surface) 5: Land surface 6: Concave part 7: Center surface 8: Projection part 8a: Projection part tip 9: Mounting hole 10: R side (R 1 ) on the tip side
11: R bottom surface (R 2 )
12: R surface on the central surface side (R 3 )
h: Difference in height between land surface and center surface

Claims (16)

略平板状のチップ本体を備え、該チップ本体の2つの主面がすくい面と着座面を、側面が逃げ面をなし、前記両主面と前記逃げ面との交差部に切刃を有する両面使用可能なスローアウェイチップにおいて、
前記各主面は、周縁部に前記切刃と連なるランド面と、前記各主面のコーナーに向かって伸びる第1突起部と、該第1突起部が向かうコーナーと隣り合うコーナーとの間に向かって伸びる第2突起部とを有し、
前記ランド面と前記第1突起部および第2突起部の頂面が同一高さであるとともに、
前記ランド面と前記第1突起部との間には凹部が形成されており、該凹部は、前記ランド面側R1面と、該R1面に連続するR2面と、該R2面に連続するとともに中央面側のR3面との3つのR面にて形成されるとともに、前記R1面の曲率半径:r1および前記R2面の曲率半径:r2および前記R3面の曲率半径:r3が、r3>r1>r2であることを特徴とするスローアウェイチップ。
Both sides having a substantially flat chip body, two main surfaces of the chip body are a rake surface and a seating surface, side surfaces are flank surfaces, and there are cutting edges at the intersections between the two main surfaces and the flank surfaces In available throw-away tips,
Each main surface is between a land surface continuous with the cutting edge at a peripheral edge, a first protrusion extending toward a corner of each main surface, and a corner adjacent to the corner toward which the first protrusion is directed. A second protrusion extending toward the
While the land surface and the top surfaces of the first and second protrusions have the same height,
A recess is formed between the land surface and the first protrusion, and the recess is continuous with the land surface side R1 surface, the R2 surface continuous with the R1 surface, and the R2 surface. It is formed by three R planes with the R3 plane on the center plane side, and the radius of curvature of the R1 plane: r1 and the radius of curvature of the R2 plane: r2 and the radius of curvature of the R3 plane: r3 are r3> r1 > Through-away tip, characterized in that r2.
略平板状のチップ本体を備え、該チップ本体の2つの主面がすくい面と着座面を、側面が逃げ面をなし、前記両主面と前記逃げ面との交差部に切刃を有する両面使用可能なスローアウェイチップにおいて、
前記各主面は、周縁部に前記切刃と連なるランド面と、前記各主面のコーナーに向かって伸びる第1突起部と、該第1突起部が向かうコーナーと隣り合うコーナーとの間に向かって伸びる第2突起部とを有し、
前記ランド面と前記第1突起部および第2突起部の頂面が設置面になるとともに、
前記ランド面と前記第1突起部との間には凹部が形成されており、該凹部は、前記ランド面側R1面と、該R1面に連続するR2面と、該R2面に連続するとともに中央面側のR3面との3つのR面にて形成されるとともに、前記R1面の曲率半径:r1および前記R2面の曲率半径:r2および前記R3面の曲率半径:r3が、r3>r1>r2であることを特徴とするスローアウェイチップ。
Both sides having a substantially flat chip body, two main surfaces of the chip body are a rake surface and a seating surface, side surfaces are flank surfaces, and there are cutting edges at the intersections between the two main surfaces and the flank surfaces In available throw-away tips,
Each main surface is between a land surface continuous with the cutting edge at a peripheral edge, a first protrusion extending toward a corner of each main surface, and a corner adjacent to the corner toward which the first protrusion is directed. A second protrusion extending toward the
While the land surfaces and the top surfaces of the first and second protrusions become installation surfaces,
A recess is formed between the land surface and the first protrusion, and the recess is continuous with the land surface side R1 surface, the R2 surface continuous with the R1 surface, and the R2 surface. It is formed by three R planes with the R3 plane on the center plane side, and the radius of curvature of the R1 plane: r1 and the radius of curvature of the R2 plane: r2 and the radius of curvature of the R3 plane: r3 are r3> r1 > Through-away tip, characterized in that r2.
前記切刃は、前記ランド面、前記第1突起部の頂面および第2突起部の頂面よりも高さが低いことを特徴とする請求項1または2に記載のスローアウェイチップ。   The throw-away tip according to claim 1 or 2, wherein the cutting blade has a height lower than that of the land surface, the top surface of the first protrusion, and the top surface of the second protrusion. 前記第1突起部頂面の先端から前記ランド面までの距離は、前記第2突起部頂面の先端から前記ランド面までの距離よりも大きいことを特徴とする請求項1乃至3のいずれかに記載のスローアウェイチップ。   The distance from the tip of the top surface of the first protrusion to the land surface is larger than the distance from the tip of the top surface of the second protrusion to the land surface. The throw-away chip as described in. 前記第1突起部または前記第2突起部の頂面の先端の角度を鋭角としたことを特徴とする請求項1乃至4のいずれかに記載のスローアウェイチップ。   The throw-away tip according to any one of claims 1 to 4, wherein an angle of a tip of a top surface of the first protrusion or the second protrusion is an acute angle. 前記スローアウェイチップの中心からチップ周縁部までの長さL1に対する前記スローアウェイチップの中心から前記第1突起部または前記第2突起部の先端までの長さL2の比(L2/L1)が0.7〜0.95であることを特徴とする請求項1乃至5のいずれかに記載のスローアウェイチップ。   The ratio (L2 / L1) of the length L2 from the center of the throw-away tip to the tip of the first projection or the second projection with respect to the length L1 from the center of the throw-away tip to the peripheral edge of the tip is 0 The throw-away tip according to any one of claims 1 to 5, wherein the throw-away tip is 0.7 to 0.95. 前記第1突起部または前記第2突起部の前記中央面と同じ高さに位置する先端と前記ランド面との距離が0.5mm以下であり、かつ前記第1突起部または前記第2突起部の先端の高さが前記ランド面に向かって10〜60度の角度で傾斜しつつ減じていることを特徴とする請求項1乃至6のいずれかに記載のスローアウェイチップ。   The distance between the tip of the first protrusion or the second protrusion that is located at the same height as the central surface and the land surface is 0.5 mm or less, and the first protrusion or the second protrusion The throwaway tip according to any one of claims 1 to 6, wherein the tip of the tip is reduced while being inclined at an angle of 10 to 60 degrees toward the land surface. 略平板状のチップ本体を備え、該チップ本体の2つの主面がすくい面と着座面を、側面が逃げ面をなし、前記両主面と前記逃げ面との交差部に切刃を有する両面使用可能なスローアウェイチップにおいて、
前記各主面は、周縁部に前記切刃と連なるランド面と、前記各主面のコーナーに向かって伸びる第1突起部とを有し、
前記ランド面と前記第1突起部の頂面が同一高さであるとともに、前記切刃は、前記ランド面および前記第1突起部の頂面よりも高さが低く、
前記ランド面と前記第1突起部との間には凹部が形成されており、該凹部は、前記ランド面側R1面と、該R1面に連続するR2面と、該R2面に連続するとともに中央面側のR3面との3つのR面にて形成されるとともに、前記R1面の曲率半径:r1および前記R2面の曲率半径:r2および前記R3面の曲率半径:r3が、r3>r1>r2であることを特徴とするスローアウェイチップ。
Both sides having a substantially flat chip body, two main surfaces of the chip body are a rake surface and a seating surface, side surfaces are flank surfaces, and there are cutting edges at the intersections between the two main surfaces and the flank surfaces In available throw-away tips,
Each main surface has a land surface that is continuous with the cutting edge at a peripheral portion, and a first protrusion that extends toward a corner of each main surface,
The land surface and the top surface of the first protrusion are the same height, and the cutting edge is lower in height than the land surface and the top surface of the first protrusion,
A recess is formed between the land surface and the first protrusion, and the recess is continuous with the land surface side R1 surface, the R2 surface continuous with the R1 surface, and the R2 surface. It is formed by three R planes with the R3 plane on the center plane side, and the radius of curvature of the R1 plane: r1 and the radius of curvature of the R2 plane: r2 and the radius of curvature of the R3 plane: r3 are r3> r1 > Through-away tip, characterized in that r2.
略平板状のチップ本体を備え、該チップ本体の2つの主面がすくい面と着座面を、側面が逃げ面をなし、前記両主面と前記逃げ面との交差部に切刃を有する両面使用可能なスローアウェイチップにおいて、
前記各主面は、周縁部に前記切刃と連なるランド面と、前記各主面のコーナーに向かって伸びる第1突起部とを有し、
前記ランド面と前記第1突起部の頂面が設置面になるとともに、前記切刃は、前記ランド面および前記第1突起部の頂面よりも高さが低く、
前記ランド面と前記第1突起部との間には凹部が形成されており、該凹部は、前記ランド面側R1面と、該R1面に連続するR2面と、該R2面に連続するとともに中央面側のR3面との3つのR面にて形成されるとともに、前記R1面の曲率半径:r1および前記R2面の曲率半径:r2および前記R3面の曲率半径:r3が、r3>r1>r2であることを特徴とするスローアウェイチップ。
Both sides having a substantially flat chip body, two main surfaces of the chip body are a rake surface and a seating surface, side surfaces are flank surfaces, and there are cutting edges at the intersections between the two main surfaces and the flank surfaces In available throw-away tips,
Each main surface has a land surface that is continuous with the cutting edge at a peripheral portion, and a first protrusion that extends toward a corner of each main surface,
The land surface and the top surface of the first protrusion become an installation surface, and the cutting edge is lower in height than the land surface and the top surface of the first protrusion,
A recess is formed between the land surface and the first protrusion, and the recess is continuous with the land surface side R1 surface, the R2 surface continuous with the R1 surface, and the R2 surface. It is formed by three R planes with the R3 plane on the center plane side, and the radius of curvature of the R1 plane: r1 and the radius of curvature of the R2 plane: r2 and the radius of curvature of the R3 plane: r3 are r3> r1 > Through-away tip, characterized in that r2.
前記第1突起部の頂面の先端の角度を鋭角としたことを特徴とする請求項8または9に記載のスローアウェイチップ。   The throw-away tip according to claim 8 or 9, wherein an angle of a tip of the top surface of the first protrusion is an acute angle. 前記スローアウェイチップの中心からチップ周縁部までの長さL1に対する前記スローアウェイチップの中心から前記第1突起部の先端までの長さL2の比(L2/L1)が0.7〜0.95であることを特徴とする請求項8乃至10のいずれかに記載のスローアウェイチップ。   The ratio (L2 / L1) of the length L2 from the center of the throw-away tip to the tip of the first projection portion with respect to the length L1 from the center of the throw-away tip to the tip peripheral portion is 0.7 to 0.95. The throw-away tip according to any one of claims 8 to 10, wherein 前記第1突起部のうち前記中央面と同じ高さに位置する先端と前記ランド面との距離が0.5mm以下であり、かつ前記第1突起部の先端の高さが前記ランド面に向かって10〜60度の角度で傾斜しつつ減じていることを特徴とする請求項8乃至11のいずれかに
記載のスローアウェイチップ。
The distance between the tip of the first protrusion that is at the same height as the central surface and the land surface is 0.5 mm or less, and the height of the tip of the first protrusion is toward the land surface. The throwaway tip according to any one of claims 8 to 11, wherein the tip is reduced while being inclined at an angle of 10 to 60 degrees.
平面視において前記チップ本体が四角形をなすことを特徴とする請求項1乃至12のいずれかに記載のスローアウェイチップ。   The throw-away tip according to any one of claims 1 to 12, wherein the tip body has a square shape in a plan view. 前記ランド面の幅が0.2〜0.5mmであることを特徴とする請求項1乃至13のいずれかに記載のスローアウェイチップ。   The throw-away tip according to any one of claims 1 to 13, wherein a width of the land surface is 0.2 to 0.5 mm. 前記主面における前記中央面および前記ランド面の面積比率が50〜90%であることを特徴とする請求項1乃至14のいずれかに記載のスローアウェイチップ。   The throwaway tip according to any one of claims 1 to 14, wherein an area ratio of the central surface and the land surface in the main surface is 50 to 90%. 請求項1〜15のいずれかに記載のスローアウェイチップと、
前記スローアウェイチップを、前記ランド面、前記突起部の頂面を設置面として装着するホルダと、を備える切削工具。
The throw-away tip according to any one of claims 1 to 15 ,
A cutting tool comprising: a holder that mounts the throw-away tip on the land surface and the top surface of the protrusion as an installation surface.
JP2007143294A 2007-05-30 2007-05-30 Throw away insert and cutting tool using the same Expired - Lifetime JP4722085B2 (en)

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JPS62121004U (en) * 1986-01-20 1987-07-31
JPH0553807U (en) * 1991-12-27 1993-07-20 三菱マテリアル株式会社 Throw-away tip
JPH0623604A (en) * 1992-07-06 1994-02-01 Ngk Spark Plug Co Ltd Throwaway chip
JPH06501890A (en) * 1991-02-19 1994-03-03 ケンナメタル インコーポレイテッド Cutting insert with chip control
JPH11277307A (en) * 1998-03-27 1999-10-12 Ngk Spark Plug Co Ltd Throwaway tip

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Publication number Priority date Publication date Assignee Title
JPS62121004A (en) * 1985-11-22 1987-06-02 アイン・エンジニアリング株式会社 Sheet-shaped thrust board

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Publication number Priority date Publication date Assignee Title
JPS62121004U (en) * 1986-01-20 1987-07-31
JPH06501890A (en) * 1991-02-19 1994-03-03 ケンナメタル インコーポレイテッド Cutting insert with chip control
JPH0553807U (en) * 1991-12-27 1993-07-20 三菱マテリアル株式会社 Throw-away tip
JPH0623604A (en) * 1992-07-06 1994-02-01 Ngk Spark Plug Co Ltd Throwaway chip
JPH11277307A (en) * 1998-03-27 1999-10-12 Ngk Spark Plug Co Ltd Throwaway tip

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