JP5953173B2 - Cutting tools - Google Patents
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- JP5953173B2 JP5953173B2 JP2012173590A JP2012173590A JP5953173B2 JP 5953173 B2 JP5953173 B2 JP 5953173B2 JP 2012173590 A JP2012173590 A JP 2012173590A JP 2012173590 A JP2012173590 A JP 2012173590A JP 5953173 B2 JP5953173 B2 JP 5953173B2
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- 238000005520 cutting process Methods 0.000 title claims description 425
- 239000000463 material Substances 0.000 claims description 40
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 229910003460 diamond Inorganic materials 0.000 claims description 15
- 239000010432 diamond Substances 0.000 claims description 15
- 230000003746 surface roughness Effects 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 9
- 238000005553 drilling Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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- Cutting Tools, Boring Holders, And Turrets (AREA)
- Milling, Broaching, Filing, Reaming, And Others (AREA)
- Milling Processes (AREA)
- Drilling Tools (AREA)
Description
本発明は、切削対象物を切削する切刃部を備えた切削工具に関する。 The present invention relates to a cutting tool provided with a cutting edge part for cutting a cutting object.
従来、この種の切削工具として、切削対象物としてのワークを切削する切削刃と、切削刃に連続し、ワークの切削により生成される切屑をすくい取るすくい面と、すくい面に連続して設けられると共にすくい面によってすくい取られる切屑を切断する壁面を含むチップブレーカと、切削刃の刃面に間隔をおいて形成された複数のニックとを備えたニック付ドリルが知られている（例えば、特許文献１参照）。また、この種の切削工具としては、切刃が少なくとも２種類の基材により構成されると共に、回転軸に対して径方向の外周側に、径方向の内周側の基材よりも、耐摩耗性の高い基材を備えた１枚刃のドリル用切削インサートも知られている（例えば、特許文献２参照）。 Conventionally, as this type of cutting tool, a cutting blade for cutting a workpiece as a cutting object, a rake surface continuous with the cutting blade and scooping up chips generated by cutting the workpiece, and continuously provided on the rake surface are provided. There is known a drill with a nick including a chip breaker including a wall surface for cutting chips scraped by a rake face and a plurality of nicks formed at intervals on the blade face of the cutting blade (for example, Patent Document 1). Further, in this type of cutting tool, the cutting blade is composed of at least two types of base materials, and is more resistant to the outer peripheral side in the radial direction than the base material on the inner peripheral side in the radial direction. A single-blade drill cutting insert provided with a highly wearable substrate is also known (see, for example, Patent Document 2).
特許文献１に記載された切削工具によれば、複数のニック（切り込み）の各々が切削刃によるワークの切削により生成されると共に切削刃の延在方向に向けて伸びる切屑を切断する機能を有することから、切屑を細かくすることができる。しかしながら、ニックは切削工具の使用と共に浅くなるものであることから、特許文献１に記載された切削工具において、切屑を細かく分断する機能を維持するためには頻繁な再研磨が要求される。また、特許文献１に記載された切削工具では、刃面に複数のニックを形成することによる切削刃の耐久性の悪化も懸念される。一方、特許文献２に記載された切削工具では、被削材に対する切削速度が高い外周部を耐磨耗性の高い材料により形成することで高速切削による外周部の磨耗を抑制し、工具寿命を向上させることができるが、当該特許文献２は、切屑を細かく分断することについて何ら開示していない。 According to the cutting tool described in Patent Document 1, each of a plurality of nicks (cuts) has a function of cutting chips that are generated by cutting a workpiece with a cutting blade and extend in the extending direction of the cutting blade. Therefore, chips can be made fine. However, since the nick becomes shallower with the use of the cutting tool, the cutting tool described in Patent Document 1 requires frequent regrinding in order to maintain the function of finely cutting the chips. Moreover, in the cutting tool described in Patent Document 1, there is a concern that the durability of the cutting blade is deteriorated by forming a plurality of nicks on the blade surface. On the other hand, in the cutting tool described in Patent Document 2, the outer peripheral portion having a high cutting speed with respect to the work material is formed of a highly wear-resistant material, thereby suppressing the wear of the outer peripheral portion due to high-speed cutting and reducing the tool life. Although it can improve, the said patent document 2 is not disclosing at all about dividing | segmenting a chip finely.
そこで、本発明は、長期にわたって切屑を細かく分断可能であると共に、工具寿命を向上させることができる切削工具の提供を主目的とする。 Therefore, the main object of the present invention is to provide a cutting tool capable of finely cutting chips over a long period of time and improving the tool life.
本発明による切削工具は、上記主目的を達成するために以下の手段を採っている。 The cutting tool according to the present invention employs the following means in order to achieve the main object.
本発明による切削工具は、
切削対象物を切削する切刃部を備えた切削工具において、
前記切刃部は、
第１切れ刃と、該第１切れ刃に連続する第１すくい面とを有する第１切刃部と、
前記第１切れ刃に隣り合う第２切れ刃と、該第２切れ刃に連続すると共に前記第１すくい面に隣り合う第２すくい面とを有する第２切刃部とを含み、
前記第１切刃部と前記第２切刃部とは、互いに異なる摩擦係数を有することを特徴とする。
The cutting tool according to the present invention is:
In a cutting tool having a cutting edge part for cutting a cutting object,
The cutting edge portion is
A first cutting edge portion having a first cutting edge and a first rake face continuous with the first cutting edge;
Including a second cutting edge adjacent to the first cutting edge, and a second cutting edge portion having a second rake face continuous with the second cutting edge and adjacent to the first rake face,
The first cutting edge part and the second cutting edge part have different friction coefficients.
この切削工具の切刃部は、第１切れ刃と、当該第１切れ刃に連続する第１すくい面とを有する第１切刃部と、第１切れ刃に隣り合う第２切れ刃と、当該第２切れ刃に連続すると共に第１すくい面に隣り合う第２すくい面とを有する第２切刃部とを含む。そして、第１切刃部と第２切刃部とは、互いに異なる摩擦係数を有する。これにより、第１切刃部および第２切刃部のうちのより小さい摩擦係数を有する一方では、切削対象物の切削によって生じる切屑が第１または第２すくい面から速やかに離間するのに対して、第１切刃部および第２切刃部のうちのより大きい摩擦係数を有する他方では、切削対象物の切削によって生じる切屑が第１または第２すくい面から離れ難くなる。この結果、この切削工具によれば、互いに異なる摩擦係数を有する第１切刃部と第２切刃部との境界で、切刃部による切削対象物の切削によって生じる切屑を細かく分断することができる。また、この切削工具が長期にわたって使用されても、第１切刃部と第２切刃部との摩擦係数の差が極端に小さくなることはなく、切刃部にニックを形成した場合に比べて、再研磨の実行サイクルを長くすることができる。そして、この切削工具では、切刃部の切削速度が高まる箇所に第１および第２切刃部のうちのより小さい摩擦係数を有する一方を配置することで、当該箇所の摩耗を抑制し、工具寿命を向上させることができる。従って、この切削工具によれば、長期にわたって切屑をより細かく分断すると共に、工具寿命を向上させることが可能となる。 The cutting edge portion of the cutting tool includes a first cutting edge, a first cutting edge portion having a first rake face continuous with the first cutting edge, a second cutting edge adjacent to the first cutting edge, A second cutting edge portion having a second rake face continuous with the second cutting edge and adjacent to the first rake face. And a 1st cutting blade part and a 2nd cutting blade part have a mutually different friction coefficient. Thereby, while having the smaller coefficient of friction of the first cutting edge part and the second cutting edge part, the chips generated by the cutting of the cutting object are quickly separated from the first or second rake face. On the other hand, on the other of the first cutting edge part and the second cutting edge part, the chips generated by the cutting of the object to be cut are hardly separated from the first or second rake face. As a result, according to this cutting tool, chips generated by cutting the object to be cut by the cutting edge can be finely divided at the boundary between the first cutting edge and the second cutting edge having different friction coefficients. it can. Moreover, even if this cutting tool is used over a long period of time, the difference in friction coefficient between the first cutting edge part and the second cutting edge part does not become extremely small, compared with the case where a nick is formed in the cutting edge part. Thus, the re-polishing execution cycle can be lengthened. In this cutting tool, by placing one of the first and second cutting blade portions having a smaller friction coefficient at a location where the cutting speed of the cutting blade portion is increased, the wear of the portion is suppressed, and the tool Lifespan can be improved. Therefore, according to this cutting tool, it is possible to divide chips finely over a long period of time and improve the tool life.
また、前記第１切刃部と前記第２切刃部とは、互い違いに配列されてもよい。これにより、切刃部（稜線）の延在方向において、第１および第２切刃部の少なくとも何れか一方の両側に第１および第２切刃部の他方が配置され、切刃部には、第１切刃部と第２切刃部との境界が複数形成されることになる。この結果、切刃部による切削対象物の切削によって生じる切屑をより細かく分断することが可能となる。 The first cutting edge part and the second cutting edge part may be arranged alternately. Thereby, in the extending direction of the cutting edge (ridge line), the other of the first and second cutting edges is arranged on both sides of at least one of the first and second cutting edges, A plurality of boundaries between the first cutting edge part and the second cutting edge part are formed. As a result, it is possible to more finely divide chips generated by cutting the object to be cut by the cutting edge portion.
更に、前記第１および第２切刃部のうち、前記切削工具の最外周側に位置する一方は、他方よりも小さい摩擦係数を有してもよい。これにより、切削速度が高まる切刃部の外周部の摩耗を抑制し、工具寿命をより向上させることが可能となる。 Further, one of the first and second cutting edge portions located on the outermost peripheral side of the cutting tool may have a smaller coefficient of friction than the other. Thereby, abrasion of the outer peripheral part of the cutting blade part where the cutting speed is increased can be suppressed, and the tool life can be further improved.
また、前記第１切刃部と前記第２切刃部とは、互いに異なる素材により形成されてもよい。これにより、第１切刃部と第２切刃部とで摩擦係数を容易に異ならせると共に、両者間の摩擦係数の差を設定する際の自由度を高めることが可能となる。 The first cutting edge part and the second cutting edge part may be formed of different materials. This makes it possible to easily change the friction coefficient between the first cutting edge part and the second cutting edge part, and to increase the degree of freedom when setting the difference in the friction coefficient between them.
更に、前記第１切刃部と前記第２切刃部とは、互いに異なる表面粗度を有するように同一の素材により形成されてもよい。これにより、第１切刃部と第２切刃部とを容易に形成することが可能となる。 Furthermore, the first cutting edge part and the second cutting edge part may be formed of the same material so as to have different surface roughness. Thereby, it becomes possible to easily form the first cutting edge part and the second cutting edge part.
また、前記第１切刃部の前記第１すくい面と、前記第２切刃部の前記第２すくい面とは、互いに異なるすくい角を有してもよい。これにより、第１切刃部と第２切刃部との境界での切屑の分断をより促進させることが可能となる。 Further, the first rake face of the first cutting edge part and the second rake face of the second cutting edge part may have rake angles different from each other. Thereby, it becomes possible to further promote the cutting of chips at the boundary between the first cutting edge part and the second cutting edge part.
更に、前記第１および第２すくい面のうち、より小さい摩擦係数を有する一方は、他方よりも小さいすくい角を有してもよい。これにより、第１切刃部および第２切刃部のうちのより小さい摩擦係数を有する一方で、切削対象物の切削によって生じる切屑を第１または第２すくい面からより速やかに離間させることができるので、第１切刃部と第２切刃部との境界での切屑の分断をより一層促進させることが可能となる。 Further, one of the first and second rake faces having a smaller coefficient of friction may have a rake angle smaller than the other. Thereby, while having a smaller coefficient of friction than the first cutting edge part and the second cutting edge part, it is possible to more quickly separate the chips generated by cutting the cutting object from the first or second rake face. Since it can do, it becomes possible to further promote the division of the chip at the boundary between the first cutting edge part and the second cutting edge part.
また、前記第１および第２切刃部は、前記第１切れ刃と前記第２切れ刃とが連続した一本の稜線を形成しないように構成されてもよい。このように切刃部の稜線に凹凸を付与することにより、切削対象物の切削に際して、切削工具から切削対象物に付与される送り方向のスラスト力を低下させ、それにより切削工具の送り速度を高くすることが可能となる。 The first and second cutting edges may be configured not to form a single ridge line in which the first cutting edge and the second cutting edge are continuous. By providing irregularities on the ridge line of the cutting edge portion in this way, when cutting the object to be cut, the thrust force in the feed direction applied from the cutting tool to the cutting object is reduced, thereby increasing the feed speed of the cutting tool. It becomes possible to make it higher.
更に、前記第１および第２切刃部の一方は、超硬材料により形成されてもよく、前記第１および第２切刃部の他方は、ダイヤモンド材料またはＣＢＮ材料により形成されてもよい。これにより、第１切刃部と第２切刃部との摩擦係数の差をより適正なものとして、第１切刃部と第２切刃部との境界での切屑の分断効果をより高めることが可能となる。 Furthermore, one of the first and second cutting edge portions may be formed of a cemented carbide material, and the other of the first and second cutting edge portions may be formed of a diamond material or a CBN material. Thereby, the difference of the friction coefficient of the 1st cutting edge part and the 2nd cutting edge part is made more appropriate, and the parting effect of the chip at the boundary of the 1st cutting edge part and the 2nd cutting edge part is raised more. It becomes possible.
そして、前記切削工具は、ドリル、エンドミル、リーマ、切削チップの何れかとして構成されるとよい。 The cutting tool may be configured as any one of a drill, an end mill, a reamer, and a cutting tip.
次に、図面を参照しながら、本発明を実施するための形態について説明する。 Next, the form for implementing this invention is demonstrated, referring drawings.
図１は、本発明による切削工具であるドリル１を示す平面図である。同図に示すドリル１は、例えばアルミニウムやアルミニウム合金等といった金属材料からなる切削対象物に対する穴あけ加工に好適なものであり、例えば超硬合金といった超硬材料により同軸かつ一体に形成されたシャンク２および切削部３を含む。シャンク２は、ドリル１を回転駆動すると共に進退移動させる駆動装置に固定され部分である。また、切削部３は、ドリル１の回転に伴って切削対象物を切削する部分であり、二つの切刃部３０や、逃げ面３５、各切刃部３０に連続する切屑排出面３９等を有する。更に、本実施形態のドリル１には、図２に示すように、各切刃部３０に冷却媒体を供給するために、軸方向に延びるオイルホール４が複数（本実施形態では、２つ）形成されている。 FIG. 1 is a plan view showing a drill 1 which is a cutting tool according to the present invention. A drill 1 shown in FIG. 1 is suitable for drilling a cutting object made of a metal material such as aluminum or an aluminum alloy. For example, a shank 2 formed coaxially and integrally with a cemented carbide material such as cemented carbide. And the cutting part 3. The shank 2 is a portion that is fixed to a drive device that rotates the drill 1 and moves it forward and backward. The cutting part 3 is a part that cuts the object to be cut along with the rotation of the drill 1. Have. Further, as shown in FIG. 2, the drill 1 of the present embodiment has a plurality of oil holes 4 extending in the axial direction in order to supply a cooling medium to each cutting blade portion 30 (two in the present embodiment). Is formed.
ドリル１の各切刃部３０は、図２および図３に示すように、ドリル１の軸方向に延びる１つの第１切刃部３１と、当該第１切刃部３１の両側に配置されると共にそれぞれドリル１の軸方向に延びる２つの第２切刃部３２とを含む。第１切刃部３１は、図３に示すように、比較的短尺の矩形帯状を呈しており、第１切れ刃３１ｅと、当該第１切れ刃３１ｅに連続する第１すくい面３１ｓとを有する。また、各第２切刃部３２は、ドリル１の径方向において第１切れ刃３１ｅに隣り合う第２切れ刃３２ｅと、当該第２切れ刃３２ｅに連続すると共にドリル１の径方向において第１すくい面３１ｓに隣り合う第２すくい面３２ｓとを有する。すなわち、第１および第２切刃部３１，３２は、図３に示すように、当該第１切刃部３１が２つの第２切刃部３２の間に位置するようにドリル１の径方向に互い違いに配列され、２つの第２切刃部３２のうちの一方は、ドリル１すなわち切刃部３０の最外周部に位置する。そして、本実施形態において、２つの第２切刃部３２は、図示するように、第１切刃部３１よりも切屑排出面３９側で一体化されている。 As shown in FIGS. 2 and 3, each of the cutting blade portions 30 of the drill 1 is arranged on one side of the first cutting blade portion 31 and one first cutting blade portion 31 extending in the axial direction of the drill 1. And two second cutting edge portions 32 each extending in the axial direction of the drill 1. As shown in FIG. 3, the first cutting edge portion 31 has a relatively short rectangular band shape, and has a first cutting edge 31e and a first rake face 31s continuous to the first cutting edge 31e. . Further, each second cutting edge portion 32 is continuous with the second cutting edge 32e adjacent to the first cutting edge 31e in the radial direction of the drill 1, and is continuous with the second cutting edge 32e and is first in the radial direction of the drill 1. The second rake face 32s is adjacent to the rake face 31s. That is, the first and second cutting edge portions 31 and 32 are arranged in the radial direction of the drill 1 so that the first cutting edge portion 31 is positioned between the two second cutting edge portions 32 as shown in FIG. Are arranged in a staggered manner, and one of the two second cutting edge portions 32 is positioned on the outermost peripheral portion of the drill 1, that is, the cutting edge portion 30. In the present embodiment, the two second cutting edge portions 32 are integrated on the chip discharge surface 39 side with respect to the first cutting edge portion 31 as illustrated.
また、第１切刃部３１の第１切れ刃３１ｅと、２つの第２切刃部３２の第２切れ刃３２ｅとは、図３に示すように、連続した１本の直線上の稜線を形成する。更に、第１切刃部３１の第１すくい面３１ｓと、第２切刃部３２の第２すくい面３２ｓとは、互いに異なるすくい角を有するように形成される。本実施形態では、図４に示すように、第２すくい面３２ｓのすくい角α２が第１すくい面３１ｓのすくい角α１がよりも小さく定められる。これにより、第１すくい面３１ｓは、第１切れ刃３１ｅから切屑排出面３９側に向かうにつれて、第２すくい面３１ｓよりも窪むことになる。従って、ドリル１の各切刃部３０には、第１切れ刃３１ｅおよび２つの第２切れ刃３２ｅにより形成される１本の稜線よりも切屑排出面３９側の領域に凹凸（段差）が形成されることになる。なお、実施例において、各切刃部３０は、ドリル１の軸心より多少外周側の位置から最外周まで形成され、切刃部３０同士は図２に示すように不連続となる。 Moreover, as shown in FIG. 3, the 1st cutting edge 31e of the 1st cutting edge part 31 and the 2nd cutting edge 32e of the two 2nd cutting edge parts 32 show the ridgeline on one continuous straight line. Form. Furthermore, the first rake face 31s of the first cutting edge portion 31 and the second rake face 32s of the second cutting edge portion 32 are formed to have different rake angles. In the present embodiment, as shown in FIG. 4, the rake angle α2 of the second rake face 32s is determined to be smaller than the rake angle α1 of the first rake face 31s. Thereby, 31 s of the 1st rake face will become depressed rather than 31 s of the 2nd rake face as it goes to the chip discharge side 39 side from the 1st cutting edge 31e. Therefore, each cutting edge portion 30 of the drill 1 is formed with irregularities (steps) in a region closer to the chip discharge surface 39 than one ridge line formed by the first cutting edge 31e and the two second cutting edges 32e. Will be. In the embodiment, each cutting edge portion 30 is formed from a position slightly on the outer peripheral side to the outermost periphery from the axial center of the drill 1, and the cutting edge portions 30 are discontinuous as shown in FIG.
そして、上述の第１切刃部３１は、ドリル１の全体を形成するものと同一の超硬合金（超硬材料）により形成される。これに対して、第２切刃部３２は、当該超硬材料よりも小さい摩擦係数を有する人造ダイヤといったダイヤモンド材料あるいはＣＢＮ（立方晶窒化ホウ素）材料により形成される。これにより、第１切刃部と第２切刃部とは、切削対象物（切削箇所）に対して互いに異なる摩擦係数を有することになり、第２切刃部３２すなわち第２切れ刃３２ｅおよび第２すくい面３２ｓの摩擦係数は、第１切刃部３１すなわち第１切れ刃３１ｅおよび第１すくい面３１ｓの摩擦係数よりも小さくなる。更に、ドリル１すなわち切刃部３０の外周部（最外周側）には、第１切刃部３１に比べて小さい摩擦係数を有する第２切刃部３２が配置されることになる。このような第１および第２切刃部３１，３２を含む切刃部３０は、例えば、第２切刃部３２を構成する人造ダイヤモンド等からなる薄厚のチップ（板体）にスリットを形成すると共に、当該スリットに第１切刃部３１を構成する超硬合金等からなる細幅かつ薄厚のチップを嵌め込み、超硬合金等からなるチップが嵌め込まれた人造ダイヤモンド等からなるチップをドリル１に形成された取付面３０ａ（図２参照）にろう付け等によって固定することよりに形成され得る。 And the above-mentioned 1st cutting edge part 31 is formed with the same cemented carbide alloy (superhard material) as what forms the whole drill 1. FIG. On the other hand, the second cutting edge portion 32 is formed of a diamond material such as an artificial diamond having a smaller friction coefficient than the superhard material or a CBN (cubic boron nitride) material. Thereby, a 1st cutting edge part and a 2nd cutting edge part will have a mutually different friction coefficient with respect to a cutting target (cutting location), and the 2nd cutting edge part 32, ie, the 2nd cutting edge 32e, and The friction coefficient of the second rake face 32s is smaller than the friction coefficients of the first cutting edge portion 31, that is, the first cutting edge 31e and the first rake face 31s. Further, the second cutting edge portion 32 having a smaller coefficient of friction than the first cutting edge portion 31 is disposed on the outer peripheral portion (outermost peripheral side) of the drill 1, that is, the cutting edge portion 30. The cutting edge part 30 including such first and second cutting edge parts 31 and 32 forms a slit in a thin chip (plate body) made of artificial diamond or the like constituting the second cutting edge part 32, for example. At the same time, a narrow and thin tip made of cemented carbide or the like constituting the first cutting edge portion 31 is fitted into the slit, and a tip made of artificial diamond or the like into which a tip made of cemented carbide or the like is fitted is attached to the drill 1. It can be formed by fixing to the formed mounting surface 30a (see FIG. 2) by brazing or the like.
上述のように構成されるドリル１を用いて切削対象物（ワーク）Ｗを切削する際には、切削対象物Ｗの表面に切刃部３０すなわち第１切れ刃３１ｅおよび第２切れ刃３２ｅが当接する状態で図示しない駆動装置によりドリル１を回転させながら、切削対象物Ｗに対して送り込む。この際、第１および第２切れ刃３１ｅ，３２ｅによる切削対象物Ｗの切削に伴って切屑が生成され、当該切屑は、第１および第２すくい面３１ｓ，３２ｓに乗り上げることで曲げ応力を受け、それによりせん断される。 When cutting the workpiece (workpiece) W using the drill 1 configured as described above, the cutting edge portion 30, that is, the first cutting edge 31e and the second cutting edge 32e are formed on the surface of the cutting object W. While the drill 1 is rotated by a driving device (not shown) in the contact state, the cutting object W is fed. At this time, chips are generated along with the cutting of the workpiece W by the first and second cutting edges 31e, 32e, and the chips receive bending stress by running on the first and second rake faces 31s, 32s. And sheared by it.
ここで、本実施形態のドリル１の各切刃部３０には、第１および第２切刃部３１，３２がドリル１の径方向において互い違いに配列され、第１切刃部３１の両側に当該第１切刃部３１よりも小さい摩擦係数を有する第２切刃部３２が存在する。このため、図５に示すように、第１切れ刃３１ｅによる切削対象物Ｗの切削に伴って第１すくい面３１ｓに乗り上げた切屑ＤＣ１は、第１切刃部３１すなわち第１すくい面３１ｓの摩擦係数が比較的大きく、当該切屑ＤＣ１と第１すくい面３１ｓとの親和性が高く保たれることにより第１すくい面３１ｓから離れ難くなる。これに対して、第１切れ刃３１ｅの両側に位置する第２切れ刃３２ｅによる切削対象物Ｗの切削に伴って第２すくい面３２ｓに乗り上げた切屑ＤＣ２は、第２切刃部３２すなわち第２すくい面３２ｓの摩擦係数が小さく、当該切屑ＤＣ２と第２すくい面３２ｓとの親和性が低いことにより第２すくい面３２ｓから速やかに離間し、図５に示すようにカール（湾曲）する。 Here, in each cutting blade part 30 of the drill 1 of the present embodiment, the first and second cutting blade parts 31 and 32 are arranged alternately in the radial direction of the drill 1, and on both sides of the first cutting blade part 31. There is a second cutting edge portion 32 having a smaller coefficient of friction than the first cutting edge portion 31. For this reason, as shown in FIG. 5, the chips DC <b> 1 riding on the first rake face 31 s with the cutting of the workpiece W by the first cutting edge 31 e are formed on the first cutting edge portion 31, that is, the first rake face 31 s. Since the friction coefficient is relatively large and the affinity between the chip DC1 and the first rake face 31s is kept high, it is difficult to leave the first rake face 31s. On the other hand, the chips DC2 that ride on the second rake face 32s along with the cutting of the workpiece W by the second cutting edges 32e located on both sides of the first cutting edge 31e are the second cutting edges 32, that is, the second cutting edges 32e. Since the friction coefficient of the two rake faces 32s is small and the affinity between the chip DC2 and the second rake face 32s is low, the two rake faces 32s are quickly separated from the second rake face 32s and curled (curved) as shown in FIG.
従って、第１および第２切れ刃３１ｅ，３２ｅによる切削対象物Ｗの切削に伴って生成された切屑は、上述のような摩擦係数の相違に起因して、一方の第２すくい面３２ｓと第１すくい面３１ｓとの境界および他方の第２すくい面３２ｓと第１すくい面３１ｓとの境界に沿って分断されることになる。この結果、ドリル１によれば、切刃部３０による切削対象物Ｗの切削によって生じる切屑をより細かく分断することが可能となる。 Therefore, the chips generated as the cutting object W is cut by the first and second cutting edges 31e and 32e are separated from the second rake face 32s and the second rake face 32s due to the difference in the friction coefficient as described above. It is divided along the boundary between the first rake face 31s and the boundary between the other second rake face 32s and the first rake face 31s. As a result, according to the drill 1, it is possible to more finely divide chips generated by the cutting of the cutting object W by the cutting edge portion 30.
図６（ａ）に、上記実施形態のドリル１と同様の構成を有する本発明の実施例に係るドリルを用いてアルミ合金製の部材に穴あけ加工を施した際に得られた切屑の一例を示し、図６（ｂ）に従来構造を有する比較例のドリルを用いて当該アルミ合金製の部材に穴あけ加工を施した際に得られた切屑の一例を示す。 FIG. 6A shows an example of chips obtained when a drilling process is performed on an aluminum alloy member using the drill according to the example of the present invention having the same configuration as the drill 1 of the above embodiment. FIG. 6B shows an example of chips obtained when the aluminum alloy member is drilled using a comparative drill having a conventional structure.
実施例のドリルおよび比較例のドリルは、何れも直径６．５ｍｍの円孔を形成するためのものである。また、実施例のドリルの切刃部は、超硬材料により形成された第１切刃部と人造ダイヤモンドにより形成された２つの第２切刃部とを有する上記実施形態のドリル１の切刃部３０と同様のものである。一方、比較例のドリルの切刃部は、実施例の第２切刃部のすくい面と同一のすくい角を有する一様平面状のすくい面を有するものであり、実施例の第１切刃部と同一の超硬材料すなわち実施例および比較例のドリルを形成する超硬材料からなるものである。更に、実施例のドリルのねじれ角は０°であり、比較例のドリルのねじれ角は１０°である。そして、各ドリルの駆動条件は、回転数が１００００ｒｐｍ、送り量が０．１ｍｍ／ｒｅｖとされた。 The drill of the example and the drill of the comparative example are all for forming a circular hole having a diameter of 6.5 mm. Moreover, the cutting blade part of the drill of an Example has the 1st cutting blade part formed of the super hard material, and the 2nd cutting blade part formed of the artificial diamond, and the cutting blade of the drill 1 of the said embodiment. This is the same as the unit 30. On the other hand, the cutting edge portion of the drill of the comparative example has a uniform rake face having the same rake angle as the rake face of the second cutting edge portion of the embodiment, and the first cutting edge of the embodiment example. It is made of the same superhard material as that of the part, that is, a superhard material forming the drills of Examples and Comparative Examples. Further, the twist angle of the drill of the example is 0 °, and the twist angle of the drill of the comparative example is 10 °. The driving conditions for each drill were a rotational speed of 10,000 rpm and a feed amount of 0.1 mm / rev.
図６（ａ）および図６（ｂ）に示すように、実施例のドリルおよび比較例のドリルによる穴あけ加工に際して得られた切屑は、いわゆる円錐らせん形や粉状扇形の切屑であった。そして、各切屑における目視により選択された複数箇所の寸法の平均値は、比較例のドリルにより得られた切屑では、およそ４ｍｍ弱であったのに対し、実施例のドリルにより得られた切屑では、およそ２ｍｍであった。この結果から、上記実施形態のドリル１によれば、切刃部３０による切削対象物Ｗの切削によって生じる切屑をより細かく分断可能となることが理解されよう。また、比較例のドリルでは、切削加工中にドリルから切削対象物に付与される送り方向のスラスト力の最大値がおよそ２８０Ｎであったのに対し、人造ダイヤモンドにより形成された第２切刃部を有する実施例のドリルでは、当該スラスト力の最大値が、およそ１５０Ｎまで低下した。 As shown in FIG. 6A and FIG. 6B, the chips obtained in the drilling process using the drill of the example and the drill of the comparative example were so-called conical spiral or powder-shaped chips. And the average value of the size of the plurality of locations selected by visual inspection in each chip was about 4 mm or less in the chip obtained by the drill of the comparative example, whereas in the chip obtained by the drill of the example , Approximately 2 mm. From this result, it will be understood that according to the drill 1 of the above-described embodiment, chips generated by the cutting of the cutting object W by the cutting edge portion 30 can be divided more finely. In the drill of the comparative example, the maximum value of the thrust force in the feed direction applied from the drill to the cutting object during the cutting process is approximately 280 N, whereas the second cutting edge portion formed of artificial diamond In the drill of the example having the above, the maximum value of the thrust force was reduced to about 150N.
以上説明したように、ドリル１の各切刃部３０は、第１切れ刃３１ｅと、当該第１切れ刃３１ｅに連続する第１すくい面３１ｓとを有する第１切刃部３１と、第１切れ刃３１ｅに隣り合う第２切れ刃３２ｅと、当該第２切れ刃３２ｅに連続すると共に第１すくい面３１ｓに隣り合う第２すくい面３２ｓとを有する第２切刃部３２とを含む。そして、第１切刃部３１と第２切刃部３２とは、互いに異なる摩擦係数を有する。これにより、第２切刃部３２よりも大きい摩擦係数を有する第１切刃部３１による切削対象物の切削によって生じる切屑は、当該第１切刃部３１の第１すくい面３１ｓから離れ難くなるのに対して、第１切刃部３１よりも小さい摩擦係数を有する第２切刃部３２による切削対象物の切削によって生じる切屑は、当該第２切刃部３２の第２すくい面３２ｓから速やかに離間する。 As described above, each cutting edge portion 30 of the drill 1 includes the first cutting edge portion 31 having the first cutting edge 31e and the first rake face 31s continuous to the first cutting edge 31e, and the first cutting edge portion 31e. It includes a second cutting edge 32e adjacent to the cutting edge 31e, and a second cutting edge 32 having a second rake face 32s that is continuous with the second cutting edge 32e and is adjacent to the first rake face 31s. And the 1st cutting blade part 31 and the 2nd cutting blade part 32 have a mutually different friction coefficient. Accordingly, chips generated by cutting the object to be cut by the first cutting edge portion 31 having a larger coefficient of friction than the second cutting edge portion 32 are difficult to be separated from the first rake face 31 s of the first cutting edge portion 31. On the other hand, chips generated by the cutting of the object to be cut by the second cutting edge portion 32 having a smaller coefficient of friction than the first cutting edge portion 31 are quickly generated from the second rake face 32s of the second cutting edge portion 32. Separate.
この結果、ドリル１によれば、互いに異なる摩擦係数を有する第１切刃部３１と第２切刃部３２との境界で、切刃部３０による切削対象物の切削によって生じる切屑を細かく分断することができる。また、ドリル１が長期にわたって使用されても、第１切刃部３１と第２切刃部３２との摩擦係数の差が極端に小さくなることはなく、切刃部３０にニックを形成した場合に比べて、再研磨の実行サイクルを長くすることができる。そして、ドリル１では、切削速度が高まる切刃部３０の外周部（最外周側）に第１切刃部３１に比べて小さい摩擦係数を有する第２切刃部３２が配置されることから、切刃部３０の外周部の摩耗を抑制し、工具寿命をより向上させることができる。従って、ドリル１によれば、長期にわたって切屑をより細かく分断すると共に、工具寿命を向上させることが可能となる。 As a result, according to the drill 1, chips generated by the cutting of the object to be cut by the cutting edge 30 are finely divided at the boundary between the first cutting edge 31 and the second cutting edge 32 having different friction coefficients. be able to. In addition, even when the drill 1 is used for a long period of time, the difference in the friction coefficient between the first cutting edge portion 31 and the second cutting edge portion 32 does not become extremely small, and a nick is formed in the cutting edge portion 30. In comparison with this, the re-polishing execution cycle can be lengthened. And in the drill 1, since the 2nd cutting edge part 32 which has a small friction coefficient compared with the 1st cutting edge part 31 is arrange | positioned in the outer peripheral part (outermost outer peripheral side) of the cutting edge part 30 where cutting speed increases. Wear of the outer peripheral portion of the cutting edge portion 30 can be suppressed, and the tool life can be further improved. Therefore, according to the drill 1, it is possible to divide chips finely over a long period of time and improve the tool life.
また、ドリル１では、第１切刃部３１と第２切刃部３２とが互い違いに配列され、切刃部３０（稜線）の延在方向において、第１切刃部３１の両側に第２切刃部３２が配置される。これにより、切刃部３０には、第１切刃部３１と第２切刃部３２との境界が複数形成されることから、切刃部３０による切削対象物の切削によって生じる切屑をより細かく分断することが可能となる。 Moreover, in the drill 1, the 1st cutting blade part 31 and the 2nd cutting blade part 32 are arranged alternately, and it is 2nd on the both sides of the 1st cutting blade part 31 in the extension direction of the cutting blade part 30 (ridgeline). A cutting blade portion 32 is disposed. Thereby, since a plurality of boundaries between the first cutting edge part 31 and the second cutting edge part 32 are formed in the cutting edge part 30, chips generated by cutting of the cutting object by the cutting edge part 30 are more finely divided. It becomes possible to divide.
なお、上記実施形態のドリル１の各切刃部３０は、ドリル１の軸方向に延びる１つの第１切刃部３１と、当該第１切刃部３１の両側に配置されると共にそれぞれドリル１の軸方向に延びる２つの第２切刃部３２とを含むものであるが、切刃部３０の構成は、これに限られるものではない。すなわち、図７に示すドリル１Ｂのように、各切刃部３０Ｂにそれぞれ複数の第１および第２切刃部３１，３２を互い違いに配列してもよい。これにより、切刃部３０Ｂには、第１切刃部３１と第２切刃部３２との境界が多数形成されることから、切刃部３０Ｂによる切削対象物の切削によって生じる切屑をより一層細かく分断することが可能となる。かかる構成は、比較的大きな直径を有する円孔を形成するためのドリルに適用されると極めて有用である。 In addition, each cutting blade part 30 of the drill 1 of the said embodiment is arrange | positioned on the both sides of the one 1st cutting blade part 31 extended in the axial direction of the drill 1, and the said 1st cutting blade part 31, and each drill 1 is each. However, the configuration of the cutting blade portion 30 is not limited to this. That is, like the drill 1B shown in FIG. 7, you may arrange | position the some 1st and 2nd cutting blade part 31 and 32 alternately at each cutting blade part 30B, respectively. Thereby, since many boundaries of the 1st cutting blade part 31 and the 2nd cutting blade part 32 are formed in the cutting blade part 30B, the chip | tip produced by cutting of the cutting target object by the cutting blade part 30B is further increased. It becomes possible to divide finely. Such a configuration is extremely useful when applied to a drill for forming a circular hole having a relatively large diameter.
更にドリル１では、第１切刃部３１と第２切刃部３２とが互いに異なる素材により形成される。これにより、第１切刃部３１と第２切刃部３２とで摩擦係数を容易に異ならせると共に、両者間の摩擦係数の差を設定する際の自由度を高めることが可能となる。ただし、第１切刃部３１と第２切刃部３２とは、互いに異なる表面粗度を有するように同一の素材（例えば、例えばドリル１を形成する超硬材料）により形成されてもよい。このような構成を採用しても、第１切刃部３１と第２切刃部３２とを容易に形成することが可能となる。なお、第１すくい面３１ｓの摩擦係数と、第２すくい面３２ｓの摩擦係数とが異なっていれば、第１切れ刃３１ｅの摩擦係数と第２切れ刃３２ｅの摩擦係数とが同一となっていてもよい。 Further, in the drill 1, the first cutting edge portion 31 and the second cutting edge portion 32 are formed of different materials. This makes it possible to easily change the friction coefficient between the first cutting edge portion 31 and the second cutting edge portion 32 and to increase the degree of freedom when setting the difference in the friction coefficient between them. However, the 1st cutting edge part 31 and the 2nd cutting edge part 32 may be formed with the same raw material (for example, super hard material which forms the drill 1, for example) so that it may have mutually different surface roughness. Even if such a configuration is adopted, the first cutting edge portion 31 and the second cutting edge portion 32 can be easily formed. If the friction coefficient of the first rake face 31s and the friction coefficient of the second rake face 32s are different, the friction coefficient of the first cutting edge 31e and the friction coefficient of the second cutting edge 32e are not the same. May be.
また、ドリル１では、第１切刃部３１の第１すくい面３１ｓと、第２切刃部３２の第２すくい面３２ｓとが互いに異なるすくい角を有している。これにより、第１切刃部３１と第２切刃部３２との境界での切屑の分断をより促進させることが可能となる。そして、ドリル１では、第１すくい面３１ｓよりも小さい摩擦係数を有する第２すくい面３２ｓのすくい角α２が第１すくい面３１ｓのすくい角α１よりも小さく定められている。これにより、第２切刃部３２による切削対象物の切削によって生じる切屑を当該第２切刃部３２の第２すくい面３２ｓからより速やかに離間させることができるので、第１切刃部３１と第２切刃部３２との境界での切屑の分断をより一層促進させることが可能となる。ただし、上記ドリル１等において、第１および第２切刃部３１，３２の第１および第２すくい面３１ｓ，３２ｓを面一に形成してもよい。これにより、切削対象物の切削によって生じる切屑を細かな針状にすると共に、第１および第２切刃部３１，３２の研磨性を向上させることが可能となる。 In the drill 1, the first rake face 31 s of the first cutting edge 31 and the second rake face 32 s of the second cutting edge 32 have different rake angles. Thereby, it becomes possible to further promote the cutting of chips at the boundary between the first cutting edge portion 31 and the second cutting edge portion 32. In the drill 1, the rake angle α2 of the second rake face 32s having a friction coefficient smaller than that of the first rake face 31s is set smaller than the rake angle α1 of the first rake face 31s. Thereby, since the chip | tip produced by the cutting of the cutting target object by the 2nd cutting blade part 32 can be spaced apart more rapidly from the 2nd rake face 32s of the said 2nd cutting blade part 32, the 1st cutting blade part 31 and It becomes possible to further promote the cutting of chips at the boundary with the second cutting edge portion 32. However, in the drill 1 or the like, the first and second rake faces 31s and 32s of the first and second cutting edge portions 31 and 32 may be formed flush with each other. Thereby, it is possible to make the chips generated by cutting the object to be cut into fine needles and improve the polishing properties of the first and second cutting edge portions 31 and 32.
なお、上記実施形態のドリル１の各切刃部３０では、第１切刃部３１の第１切れ刃３１ｅと、２つの第２切刃部３２の第２切れ刃３２ｅとが連続した１本の直線上の稜線を形成するが、切刃部３０の構成は、これに限られるものではない。すなわち、図８および図９に示すドリル１Ｃの切刃部３０Ｃのように、第１および第２切刃部３２を第１切れ刃３１ｅと第２切れ刃３２ｅとが連続した一本の稜線を形成しないように構成しつつ、第１すくい面３１ｓのすくい角α１と、第２すくい面３２ｓのすくい角α２とを異ならせてもよい。このように切刃部３０Ｃの稜線に凹凸を付与することにより、切削対象物の切削に際して、ドリル１から切削対象物に付与される送り方向のスラスト力を低下させ、それによりドリル１の送り速度を高くすることが可能となる。更に、このように切刃部３０Ｃの稜線に凹凸を付与することにより、ドリル１Ｃの各切刃部３０Ｃには、第１切れ刃３１ｅおよび２つの第２切れ刃３２ｅよりも切屑排出面３９側の領域に凹凸（段差）が形成されることになるので、第１すくい面３１ｓのすくい角α１と第２すくい面３２ｓのすくい角α２とを同一（０°を含む）にしてもよい。 In addition, in each cutting edge part 30 of the drill 1 of the said embodiment, the 1st cutting edge 31e of the 1st cutting edge part 31 and the 2nd cutting edge 32e of the 2nd 2 cutting edge part 32 continued one However, the configuration of the cutting edge portion 30 is not limited to this. That is, like the cutting edge portion 30C of the drill 1C shown in FIGS. 8 and 9, the first and second cutting edge portions 32 have a single ridge line in which the first cutting edge 31e and the second cutting edge 32e are continuous. The rake angle α1 of the first rake face 31s may be different from the rake angle α2 of the second rake face 32s while being configured not to form. By providing irregularities on the ridge line of the cutting edge portion 30C in this way, the thrust force in the feed direction applied from the drill 1 to the cutting object is reduced when cutting the cutting object, and thereby the feed speed of the drill 1 is reduced. Can be increased. Furthermore, by providing irregularities on the ridge line of the cutting edge portion 30C in this way, each cutting edge portion 30C of the drill 1C has a chip discharge surface 39 side than the first cutting edge 31e and the two second cutting edges 32e. Therefore, the rake angle α1 of the first rake face 31s and the rake angle α2 of the second rake face 32s may be the same (including 0 °).
また、上記ドリル１において、第１切刃部３１は、超硬材料により形成され、第２切刃部３２は、ダイヤモンド材料またはＣＢＮ材料により形成される。これにより、第１切刃部３１と第２切刃部３２との摩擦係数の差をより適正なものとして第１切刃部３１と第２切刃部３２との境界での切屑の分断効果をより高めると共に、切削加工中にドリル１から切削対象物に付与される送り方向のスラスト力を低減することが可能となるなお、低摩擦材料としてのＣＢＮ材料は、切削対象物が比較的軟らかい金属等からなる鋳造品である場合に用いられるとよい。 In the drill 1, the first cutting edge portion 31 is formed of a super hard material, and the second cutting edge portion 32 is formed of a diamond material or a CBN material. Thereby, the difference of the friction coefficient of the 1st cutting blade part 31 and the 2nd cutting blade part 32 is made more appropriate, and the cutting | disconnection effect of the chip | tip at the boundary of the 1st cutting blade part 31 and the 2nd cutting blade part 32 is obtained. It is possible to reduce the thrust force in the feed direction applied from the drill 1 to the cutting object during the cutting process, and the CBN material as the low friction material is relatively soft in the cutting object. It may be used when the casting is made of metal or the like.
そして、本発明による切削工具は、上述のようなドリル１，１Ｂ，１Ｃに限られるものではない。 The cutting tool according to the present invention is not limited to the drills 1, 1B, 1C as described above.
すなわち、本発明による切削工具は、図１０に示すようなエンドミルとして構成されてもよい。同図に示すエンドミル１０の切刃部１３０は、第１切れ刃１３１ｅと、当該第１切れ刃１３１ｅに連続する第１すくい面１３１ｓとを有する第１切刃部１３１と、第１切れ刃１３１ｅに隣り合う第２切れ刃１３２ｅと、当該第２切れ刃１３２ｅに連続すると共に第１すくい面１３１ｓに隣り合う第２すくい面１３２ｓとを有する第２切刃部１３２とをそれぞれ複数含む。そして、エンドミル１０では、第１切刃部１３１が当該エンドミル１０の全体を構成するものと同一の超硬合金（超硬材料）により形成され、第２切刃部１３２が当該超硬材料よりも小さい摩擦係数を有する人造ダイヤといったダイヤモンド材料あるいはＣＢＮ材料により形成される。更に、エンドミル１０では、外周刃１５０に対して、第１切刃部１３１と同様の構成を有する第１外周切刃部１５１と、第２切刃部１３２と同様の構成を有する第２外周切刃部１５２とが互い違いに配列されてもよい。 That is, the cutting tool according to the present invention may be configured as an end mill as shown in FIG. The cutting edge portion 130 of the end mill 10 shown in the figure includes a first cutting edge 131 having a first cutting edge 131e and a first rake face 131s continuous with the first cutting edge 131e, and a first cutting edge 131e. The second cutting edge 132e adjacent to the second cutting edge 132e and the second cutting edge 132 having a second rake face 132s that is continuous with the second cutting edge 132e and is adjacent to the first rake face 131s. And in the end mill 10, the 1st cutting edge part 131 is formed with the same cemented carbide alloy (super hard material) as what comprises the whole said end mill 10, and the 2nd cutting edge part 132 is rather than the said cemented carbide material. It is made of a diamond material such as an artificial diamond having a small coefficient of friction or a CBN material. Further, in the end mill 10, the second outer peripheral cutting edge 150 has the same configuration as the first outer cutting edge portion 151 and the second outer cutting edge portion 132 with respect to the outer peripheral cutting edge 150. The blade portions 152 may be arranged alternately.
また、本発明による切削工具は、図１１に示すようなリーマとして構成されてもよい。図１１に示すリーマ２０の切刃部２３０は、第１切れ刃２３１ｅと、当該第１切れ刃２３１ｅに連続する第１すくい面２３１ｓとを有する１つの第１切刃部２３１と、第１切れ刃２３１ｅに隣り合う第２切れ刃２３２ｅと、当該第２切れ刃２３２ｅに連続すると共に第１すくい面２３１ｓに隣り合う第２すくい面２３２ｓとを有する２つの第２切刃部２３２とを含む。そして、リーマ２０では、第１切刃部２３１が当該リーマ２０の全体を構成するものと同一の超硬合金（超硬材料）により形成され、第２切刃部２３２が当該超硬材料よりも小さい摩擦係数を有する人造ダイヤといったダイヤモンド材料あるいはＣＢＮ材料により形成される。 Further, the cutting tool according to the present invention may be configured as a reamer as shown in FIG. The cutting edge part 230 of the reamer 20 shown in FIG. 11 includes a first cutting edge part 231 having a first cutting edge 231e and a first rake face 231s continuous with the first cutting edge 231e, and a first cutting edge. It includes a second cutting edge 232e adjacent to the blade 231e and two second cutting edges 232 that are continuous with the second cutting edge 232e and have a second rake face 232s adjacent to the first rake face 231s. And in the reamer 20, the 1st cutting blade part 231 is formed with the same cemented carbide alloy (super hard material) as what comprises the whole of the said reamer 20, and the 2nd cutting blade part 232 is rather than the said super hard material. It is made of a diamond material such as an artificial diamond having a small coefficient of friction or a CBN material.
更に、本発明による切削工具は、図１２に示すような切削チップとして構成されてもよい。図１２に示す切削チップ５０の切刃部５３０は、第１切れ刃５３１ｅと、当該第１切れ刃５３１ｅに連続する第１すくい面５３１ｓとを有する第１切刃部５３１と、第１切れ刃５３１ｅに隣り合う第２切れ刃５３２ｅと、当該第２切れ刃５３２ｅに連続すると共に第１すくい面５３１ｓに隣り合う第２すくい面５３２ｓとを有する第２切刃部５３２とをそれぞれ複数含む。そして、切削チップ５０では、第１切刃部５３１が当該切削チップ５０の全体を構成するものと同一の超硬合金（超硬材料）により形成され、第２切刃部５３２が当該超硬材料よりも小さい摩擦係数を有する人造ダイヤといったダイヤモンド材料あるいはＣＢＮ材料により形成される。 Furthermore, the cutting tool according to the present invention may be configured as a cutting tip as shown in FIG. The cutting edge portion 530 of the cutting tip 50 shown in FIG. 12 includes a first cutting edge portion 531 having a first cutting edge 531e and a first rake face 531s continuous to the first cutting edge 531e, and a first cutting edge. A plurality of second cutting edges 532e adjacent to 531e and a second cutting edge 532 having a second rake face 532s continuous with the second cutting edge 532e and adjacent to the first rake face 531s are included. In the cutting tip 50, the first cutting edge portion 531 is formed of the same cemented carbide (superhard material) as that constituting the entire cutting tip 50, and the second cutting edge portion 532 is formed of the cemented carbide material. It is formed of a diamond material such as an artificial diamond having a smaller coefficient of friction or a CBN material.
なお、上記実施形態における主要な要素と課題を解決するための手段の欄に記載された発明の主要な要素との対応関係は、実施形態が課題を解決するための手段の欄に記載された発明を実施するための形態を具体的に説明するための一例であることから、課題を解決するための手段の欄に記載した発明の要素を限定するものではない。すなわち、実施形態はあくまで課題を解決するための手段の欄に記載された発明の具体的な一例に過ぎず、課題を解決するための手段の欄に記載された発明の解釈は、その欄の記載に基づいて行なわれるべきものである。 The correspondence between the main elements in the embodiment and the main elements of the invention described in the means for solving the problem is described in the means for solving the problem in the embodiment. Since it is an example for concretely explaining the form for carrying out the invention, the element of the invention indicated in the column of the means for solving a subject is not limited. That is, the embodiment is merely a specific example of the invention described in the means for solving the problem, and the interpretation of the invention described in the means for solving the problem is It should be done based on the description.
以上、本発明の実施の形態について説明したが、本発明は上記実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内において様々な変更をなし得ることはいうまでもない。 Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention. .
本発明は、ドリル、エンドミル、リーマ、切削チップといった切削工具の製造産業において利用可能である。 The present invention can be used in the manufacturing industry of cutting tools such as drills, end mills, reamers, and cutting tips.
１，１Ｂ，１Ｃ ドリル、２ シャンク、３ 切削部、４ オイルホール、１０ エンドミル、２０ リーマ、３０、３０Ｂ，３０Ｃ，１３０，２３０，５３０ 切刃部、３０ａ 取付面、３１，１３１，２３１，５３１ 第１切刃部、３１ｅ，１３１ｅ，２３１ｅ，５３１ｅ 第１切れ刃、３１ｓ，１３１ｓ，２３１ｓ，５３１ｓ 第１すくい面、３２，１３２，２３２，５３２ 第２切刃部、３２ｅ，１３２ｅ，２３２ｅ，５３２ｅ 第２切れ刃、３２ｓ，１３２ｓ，２３２ｓ，５３２ｓ 第２すくい面、３５ 逃げ面、３９ 切屑排出面、５０ 切削チップ、１５０ 外周刃、１５１ 第１外周切刃部、１５２ 第２外周切刃部、ＤＣ１，ＤＣ２ 切屑、Ｗ 切削対象物。 1, 1B, 1C Drill, 2 Shank, 3 Cutting part, 4 Oil hole, 10 End mill, 20 Reamer, 30, 30B, 30C, 130, 230, 530 Cutting edge part, 30a Mounting surface, 31, 131, 231, 531 First cutting edge, 31e, 131e, 231e, 531e First cutting edge, 31s, 131s, 231s, 531s First rake face, 32, 132, 232, 532 Second cutting edge, 32e, 132e, 232e, 532e Second cutting edge, 32 s, 132 s, 232 s, 532 s Second rake face, 35 flank face, 39 chip discharge face, 50 cutting tip, 150 outer peripheral edge, 151 first outer peripheral cutting edge, 152 second outer peripheral cutting edge, DC1, DC2 Chips, W Cutting object.
Claims (8)
前記切刃部は、
第１切れ刃と、該第１切れ刃に連続する第１すくい面とを有する第１切刃部と、
前記第１切れ刃に隣り合う第２切れ刃と、該第２切れ刃に連続すると共に前記第１すくい面に隣り合う第２すくい面とを有する第２切刃部とを含み、
前記第１切刃部と前記第２切刃部とは、互いに異なる摩擦係数を有し、前記第１切刃部の前記第１すくい面と、前記第２切刃部の前記第２すくい面とは、互いに異なるすくい角を有することを特徴とする切削工具。 In a cutting tool having a cutting edge part for cutting a cutting object,
The cutting edge portion is
A first cutting edge portion having a first cutting edge and a first rake face continuous with the first cutting edge;
Including a second cutting edge adjacent to the first cutting edge, and a second cutting edge portion having a second rake face continuous with the second cutting edge and adjacent to the first rake face,
The first cutting edge part and the second cutting edge part have different friction coefficients, and the first rake face of the first cutting edge part and the second rake face of the second cutting edge part. Is a cutting tool characterized by having rake angles different from each other.
前記第１切刃部と前記第２切刃部とは、互い違いに配列されることを特徴とする切削工具。 The cutting tool according to claim 1,
The cutting tool, wherein the first cutting edge part and the second cutting edge part are arranged alternately.
前記第１および第２切刃部のうち、前記切削工具の最外周側に位置する一方は、他方よりも小さい摩擦係数を有することを特徴とする切削工具。 The cutting tool according to claim 1 or 2,
One of the first and second cutting edge portions located on the outermost peripheral side of the cutting tool has a smaller friction coefficient than the other.
前記第１切刃部と前記第２切刃部とは、互いに異なる素材により形成されることを特徴とする切削工具。 In the cutting tool according to any one of claims 1 to 3,
The first cutting blade portion and the second cutting blade portion are formed of different materials from each other.
前記第１および第２切刃部の一方は、超硬材料により形成され、前記第１および第２切刃部の他方は、ダイヤモンド材料またはＣＢＮ材料により形成されることを特徴とする切削工具。 The cutting tool according to claim 4 , wherein
One of said 1st and 2nd cutting blade parts is formed with a cemented carbide material, and the other of said 1st and 2nd cutting blade parts is formed with a diamond material or a CBN material, The cutting tool characterized by the above-mentioned.
前記第１切刃部と前記第２切刃部とは、互いに異なる表面粗度を有するように同一の素材により形成されることを特徴とする切削工具。 In the cutting tool according to any one of claims 1 to 3,
The cutting tool, wherein the first cutting edge part and the second cutting edge part are formed of the same material so as to have different surface roughness.
前記第１および第２すくい面のうち、より小さい摩擦係数を有する一方は、他方よりも小さいすくい角を有することを特徴とする切削工具。 The cutting tool according to any one of claims 1 to 6,
One of the first and second rake faces having a smaller coefficient of friction has a rake angle smaller than the other.
ドリル、エンドミル、リーマ、切削チップの何れかとして構成されることを特徴とする切削工具。
In the cutting tool according to any one of claims 1 to 7 ,
A cutting tool configured as a drill, an end mill, a reamer, or a cutting tip.
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| JP2012173590A JP5953173B2 (en) | 2012-08-06 | 2012-08-06 | Cutting tools |
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| JP2012173590A JP5953173B2 (en) | 2012-08-06 | 2012-08-06 | Cutting tools |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI508804B (en) * | 2014-12-23 | 2015-11-21 | Hsin Tien Chang | Screw feed cutter |
| KR102628494B1 (en) * | 2022-03-25 | 2024-01-25 | (주)젠센로보틱스 | Deburring tool and deburring apparatus having the same |
| WO2023188007A1 (en) * | 2022-03-29 | 2023-10-05 | 株式会社アイシン | Cutting tool |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5870812U (en) * | 1981-11-06 | 1983-05-13 | 株式会社豊田中央研究所 | diamond drill |
| JPS59175912A (en) * | 1983-03-25 | 1984-10-05 | Sumitomo Electric Ind Ltd | Carbide drill |
| JPS60100110U (en) * | 1983-12-14 | 1985-07-08 | 株式会社 エフエスケ− | Cutting tools |
| JPS634212U (en) * | 1986-06-23 | 1988-01-12 | ||
| JPH0634899Y2 (en) * | 1987-06-02 | 1994-09-14 | 愛三工業株式会社 | Rotary cutting tool |
| JPH052247Y2 (en) * | 1987-07-21 | 1993-01-20 | ||
| JP2556393B2 (en) * | 1990-02-07 | 1996-11-20 | ジーエヌツール株式会社 | Cutting tool having twisted blade and manufacturing method thereof |
| US5065647A (en) * | 1990-08-27 | 1991-11-19 | Ford Motor Company | Bit for drilling cast iron |
| AU647549B2 (en) * | 1990-11-26 | 1994-03-24 | De Beers Industrial Diamond Division (Proprietary) Limited | Cutting insert for a rotary cutting tool |
| DE4141368A1 (en) * | 1991-12-14 | 1993-06-17 | Krupp Widia Gmbh | CUTTING INSERT |
| JPH11197921A (en) * | 1998-01-19 | 1999-07-27 | Wakai & Co Ltd | Cutting edge |
| JP5224902B2 (en) * | 2008-05-14 | 2013-07-03 | 株式会社東芝 | Total type rotary cutting tool, groove cutting apparatus and groove cutting method |
| US8827606B2 (en) * | 2009-02-10 | 2014-09-09 | Kennametal Inc. | Multi-piece drill head and drill including the same |
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