JP5892331B2 - Surface coated drill with excellent lubrication and wear resistance - Google Patents
Surface coated drill with excellent lubrication and wear resistance Download PDFInfo
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本発明は、ドリル本体の先端部外周に切屑排出溝が形成されるとともに、この切屑排出溝のドリル回転方向を向く内周面の先端に切刃が設けられ、主として金属材よりなる加工物に穴あけ加工をするのに用いられる長期間に亘りすぐれた潤滑特性と耐摩耗性を維持する表面被覆ドリルに関するものである。 In the present invention, a chip discharge groove is formed on the outer periphery of the tip of the drill body, and a cutting edge is provided at the tip of the inner peripheral surface of the chip discharge groove facing the drill rotation direction. The present invention relates to a surface-coated drill used for drilling, which maintains excellent lubrication characteristics and wear resistance over a long period of time.
このようなドリルとしては、軸線を中心として該軸線回りにドリル回転方向に回転される概略円柱状のドリル本体の先端側が切刃部とされ、この切刃部の外周に一対の切屑排出溝が、軸線に関して互いに対称となるように、該切刃部の先端面、すなわちドリル本体の先端逃げ面から後端側に向かうに従い軸線回りにドリル回転方向の後方側に捩れる螺旋状に形成され、これらの切屑排出溝の内周面のうちドリル回転方向を向く部分の先端側の前記先端逃げ面との交差稜線部に切刃が形成された、いわゆる２枚刃のソリッドドリルが知られている。従って、このようなソリッドドリルでは、前記切屑排出溝内周面のドリル回転方向を向く部分の先端側がこの切刃のすくい面となり、切刃によって生成された切屑は、このすくい面から切屑排出溝の内周面を摺接しつつ、該切屑排出溝の捩れによって後端側に送り出されて排出されることとなる。そして、さらにこのようなドリルでは、ドリル本体の耐摩耗性の向上のために種々の方法が採用されている。 As such a drill, the tip side of a substantially cylindrical drill body rotated about the axis in the rotation direction of the drill is a cutting blade portion, and a pair of chip discharge grooves are formed on the outer periphery of the cutting blade portion. In order to be symmetrical with respect to the axis, the tip of the cutting edge, that is, a spiral that twists toward the rear side in the drill rotation direction around the axis as it goes from the tip flank of the drill body toward the rear end, A so-called two-blade solid drill is known in which a cutting edge is formed at an intersecting ridge line portion with the tip flank on the tip side of the inner circumferential surface of these chip discharge grooves facing the rotation direction of the drill. . Therefore, in such a solid drill, the tip side of the inner peripheral surface of the chip discharge groove facing the drill rotation direction is the rake face of the cutting blade, and the chips generated by the cutting blade are transferred from the rake face to the chip discharge groove. While being in sliding contact with the inner peripheral surface, the chips are fed to the rear end side by the twist of the chip discharge groove and discharged. Further, in such a drill, various methods are employed for improving the wear resistance of the drill body.
例えば、特許文献１においては、厚さ方向にＡｌ最高含有点（Ｔｉ最低含有点）とＡｌ最低含有点（Ｔｉ最高含有点）とが交互に所定間隔をおいて繰り返し存在し、かつ前記Ａｌ最高含有点からＡｌ最低含有点、前記Ａｌ最低含有点からＡｌ最高含有点へＡｌ（Ｔｉ）含有量が連続的に変化する成分濃度分布構造を有する硬質被覆層を形成することによって、耐摩耗性を向上させた表面被覆ドリルが開示されている。 For example, in Patent Document 1, an Al highest content point (Ti lowest content point) and an Al lowest content point (Ti highest content point) are alternately present at predetermined intervals in the thickness direction, and the Al highest content point is present. By forming a hard coating layer having a component concentration distribution structure in which the Al (Ti) content continuously changes from the content point to the Al minimum content point and from the Al minimum content point to the Al maximum content point, wear resistance is improved. An improved surface coated drill is disclosed.
また、特許文献２においては、硬質被覆層を切刃の外周端から後端側に向けて切刃の外径Ｄに対して３×Ｄ以内の長さＭの範囲までに被覆したことによって、切屑詰まりの発生を防いで折損等の生じることのない表面被覆ドリルが開示されている。 Further, in Patent Document 2, by coating the hard coating layer from the outer peripheral end of the cutting blade toward the rear end side in a range of a length M within 3 × D with respect to the outer diameter D of the cutting blade, There is disclosed a surface-coated drill that prevents chip clogging and does not break.
また、特許文献３においては、切屑排出溝の内周面には硬質被覆層を被覆した後にポリッシュ加工を施したことによって、切屑詰まりの発生を防いで折損等の生じることのない表面被覆ドリルが開示されている。 Moreover, in patent document 3, the surface covering drill which prevents generation | occurrence | production of chip clogging and does not produce a breakage by carrying out polish processing after coat | covering a hard coating layer on the inner peripheral surface of a chip discharge groove | channel is not produced. It is disclosed.
また、特許文献４においては、基材表面に最外層と内層とからなる被覆層を備え、最外層は、窒化アルミニウム又は炭窒化アルミニウムからなり、最外層中に塩素を０超０．５原子％以下含有することによって、すぐれた潤滑性を有して使用寿命が長い表面被覆ドリルが開示されている。 Further, in Patent Document 4, a coating layer comprising an outermost layer and an inner layer is provided on the surface of the substrate, the outermost layer is made of aluminum nitride or aluminum carbonitride, and chlorine is contained in the outermost layer in an amount of more than 0 and 0.5 atomic%. A surface-coated drill having excellent lubricity and a long service life is disclosed by containing the following.
また、特許文献５においては、最表層がＣｒＯｙ（原子比で０．３≦ｙ≦１．５）で構成され、その膜厚が０．０１〜２．０μｍである硬質被覆層を備えたことにより耐凝着性又は耐溶着性を向上させた表面被覆ドリルが開示されている。 Moreover, in patent document 5, the outermost layer was comprised by CrOy (atomic ratio 0.3 <= y <= 1.5), and the film thickness was provided with the hard coating layer which is 0.01-2.0 micrometers. Discloses a surface-coated drill with improved adhesion resistance or welding resistance.
また、特許文献６においては、工具基体の表面に、０．８〜５．０μｍの層厚のＣｒとＡｌの複合窒化物からなる硬質被覆層が蒸着形成された表面被覆切削工具において、該硬質被覆層は、ＣｒとＡｌの複合窒化物の粒状晶組織からなる薄層Ａと柱状晶組織からなる薄層Ｂとの交互積層構造として構成され、薄層Ａおよび薄層Ｂはそれぞれ０．１〜２μｍの層厚を有し、さらに、上記薄層Ａを構成する粒状晶の平均結晶粒径は３０ｎｍ以下、また、上記薄層Ｂを構成する柱状晶の平均結晶粒径は５０〜５００ｎｍであることを特徴とする表面被覆切削工具、および上記ＣｒとＡｌの複合窒化物は、組成式：（Ｃｒ１−ＸＡｌＸ）Ｎで表した場合に、０．５５≦Ｘ≦０．７５（但し、Ｘは原子比）を満足する表面被覆工具が開示されている。 Further, in Patent Document 6, in a surface-coated cutting tool in which a hard coating layer made of a composite nitride of Cr and Al having a layer thickness of 0.8 to 5.0 μm is deposited on the surface of a tool base, The coating layer is configured as an alternately laminated structure of a thin layer A composed of a granular crystal structure of a composite nitride of Cr and Al and a thin layer B composed of a columnar crystal structure, and each of the thin layer A and the thin layer B is 0.1 The average crystal grain size of the granular crystals constituting the thin layer A is 30 nm or less, and the average crystal grain size of the columnar crystals constituting the thin layer B is 50 to 500 nm. The surface-coated cutting tool characterized by being, and the composite nitride of Cr and Al, when expressed by a composition formula: (Cr 1−X Al X ) N, 0.55 ≦ X ≦ 0.75 ( However, a surface-coated tool satisfying X is an atomic ratio is disclosed.
近年のドリル加工装置の自動化はめざましく、加えてドリル加工に対する省力化、省エネ化、低コスト化さらに効率化の要求も強く、これに伴い、高送り、高切り込みなどより高効率の深穴用ドリル加工が要求される傾向にあるが、前記従来表面被覆ドリルにおいては、各種の鋼や鋳鉄を通常条件下でドリル加工した場合に特段の問題は生じないが、潤滑特性と耐摩耗性が必要とされるとともに切屑がドリルの切屑排出溝につまり易い、湿式高速の深穴用ドリル加工に用いた場合には、切屑排出溝に切屑がつまり易く、これが原因で、比較的短時間で使用寿命に至るのが現状である。 The automation of drilling machines in recent years is remarkable, and in addition, there are strong demands for labor saving, energy saving, cost reduction and efficiency improvement for drilling, and accordingly, drills for deep holes with higher efficiency such as high feed and high cutting. Although there is a tendency to require machining, the conventional surface-coated drill does not cause any particular problems when drilling various steels and cast irons under normal conditions, but requires lubrication characteristics and wear resistance. In addition, when it is used for wet high-speed deep hole drilling, where chips are easily clogged in the drill chip discharge groove, chips are easily clogged in the chip discharge groove. This is the current situation.
そこで、本発明者らは、前述のような観点から、湿式高速の深穴用ドリル加工に用いられた場合にも長期間に亘りすぐれた潤滑特性と耐摩耗性を維持する表面被覆ドリルを提供すべく、ドリルの最表面層に粒径組成制御層として（Ｃｒ１−ｘＡｌｘ）Ｎの成分系からなる層厚０．３〜５μｍの硬質被覆層が存在する表面被覆ドリルの粒径組成制御層の構造に着目し鋭意研究を行った結果、次のような知見を得た。 In view of the above, the present inventors provide a surface-coated drill that maintains excellent lubrication characteristics and wear resistance over a long period of time even when used in wet high-speed deep hole drilling. Therefore, the particle size composition of the surface-coated drill in which a hard coating layer having a layer thickness of 0.3 to 5 μm made of the component system of (Cr 1-x Al x ) N exists as the particle size composition control layer on the outermost surface layer of the drill. As a result of earnest research focusing on the structure of the control layer, the following findings were obtained.
（ａ）ドリルのマージン部の粒径組成制御層の膜断面でのＡｌの含有比率ｘが、ｘの値が０．１から０．６の範囲に存在し、ｘの値が０．２以下となる層状のＣｒ高含有領域とｘの値が０．３以上となる層状のＡｌ高含有領域が、前記粒径組成制御層の中に各々少なくとも一層以上含まれ、かつ
（ｂ）Ｃｒ高含有領域における結晶粒の平均アスペクト比Ａが１〜５であり、
（ｃ）Ａｌ高含有領域における結晶粒の平均アスペクト比Ｂが１０〜７０である場合、このような硬質被覆層を備えた表面被覆ドリルは、従来の表面被覆ドリルに比して、湿式高速の深穴加工において、すぐれた潤滑特性・耐摩耗性および耐チッピング性を示すことを見出した。
さらに、Ｃｒ高含有領域の平均層厚ＸＣｒが３０〜２００ｎｍの範囲に存在し、かつ、Ａｌ高含有領域の平均層厚ＸＡｌが３０〜２００ｎｍの範囲に存在し、かつ、ドリルマージン部におけるＸＣｒがドリル先端からドリル外径の５倍の距離までの領域にかけて漸次増加し、かつ、ドリルマージン部におけるＸＡｌが、ドリル先端から、ドリル外径の５倍の距離までの領域にかけて漸次減少するように構成した場合、潤滑特性、耐摩耗性および耐チッピング性が一層向上することを見出した。
(A) The Al content ratio x in the film cross section of the grain size composition control layer in the margin part of the drill exists in the range of x value of 0.1 to 0.6, and the value of x is 0.2 or less A layered high Cr content region and a layered Al high content region in which the value of x is 0.3 or more are each included in the grain size composition control layer, and (b) a high Cr content The average aspect ratio A of the crystal grains in the region is 1 to 5,
(C) When the average aspect ratio B of the crystal grains in the Al-rich region is 10 to 70, the surface-coated drill provided with such a hard coating layer has a higher wet speed than the conventional surface-coated drill. It has been found that in deep hole machining, it exhibits excellent lubrication properties, wear resistance and chipping resistance.
Moreover, the average layer thickness X Cr of Cr-rich region is present in the range of 30 to 200 nm, and the average layer thickness X Al of Al-rich region is present in the range of 30 to 200 nm, and, in the drill margin X Cr is gradually increased toward the area from the drill tip to five times the distance of the drill outer diameter, and, X Al in the drill margin is gradually reduced toward the region of the drill tip, to a distance of 5 times the drill outer diameter It has been found that the lubrication characteristics, wear resistance and chipping resistance are further improved when configured as described above.
前述したような硬質被覆層は、図１の概略説明図に示される物理蒸着装置の１種である圧力勾配型Ａｒプラズマガンを利用したイオンプレーティング装置にドリル基体を装着し、
ドリル基体温度：４００〜４３０℃、
蒸発源１：金属Ｃｒ、
蒸発源１に対するプラズマガン放電電力：９〜１１ｋＷ、
蒸発源２：金属Ａｌ、
蒸発源２に対するプラズマガン放電電力：７〜８ｋＷ、
反応ガス流量：窒素（Ｎ２）ガス ８０〜１００ｓｃｃｍ、
放電ガス：アルゴン（Ａｒ）ガス ３０〜３５ｓｃｃｍ、
ドリル基体に印加する直流バイアス電圧：−１５〜−１０Ｖ、
という特定の条件下で、かつ、ドリル基体の先端を回転中心に向けた方向で固定し、回転軸をハース積載面の法線から０度または３５〜５５度傾けて設置し、公転するドリル基体が通過する円周とＣｒのハースの距離が、公転するドリル基体が通過する円周とＡｌのハースの距離よりも短い、すなわち、相対的に空間中のＣｒ量が高い領域では速い成膜速度、相対的にＡｌ量が高い領域では遅い成膜速度となるよう調整された状態で、かつ、ＸＣｒおよびＸＡｌの目標層厚に応じて、その公転速度が、Ｃｒのハースに最も接近する位置で最大、Ａｌのハースに最も接近する位置で最小となる、三角波形状の速度制御パターンとすることによって、形成することができる。この結果形成された硬質被覆層を備えた表面被覆ドリルは、従来の表面被覆ドリルに比して、湿式高速の深穴加工において、すぐれた潤滑特性および耐摩耗性を示すことを見出した。
The hard coating layer as described above has a drill base attached to an ion plating apparatus using a pressure gradient type Ar plasma gun, which is a kind of physical vapor deposition apparatus shown in the schematic explanatory diagram of FIG.
Drill base temperature: 400-430 ° C.
Evaporation source 1: metal Cr,
Plasma gun discharge power for the evaporation source 1: 9 to 11 kW,
Evaporation source 2: Metal Al,
Plasma gun discharge power for the evaporation source 2: 7 to 8 kW,
Reaction gas flow rate: Nitrogen (N 2 ) gas 80-100 sccm,
Discharge gas: Argon (Ar) gas 30-35 sccm,
DC bias voltage applied to the drill base: -15 to -10 V,
The drill base that revolves under the specified conditions, with the tip of the drill base fixed in the direction toward the center of rotation and the rotary shaft tilted from the normal of the hearth loading surface by 0 degrees or 35 to 55 degrees The distance between the circumference through which the Cr passes and the Cr hearth is shorter than the distance between the circumference through which the revolving drill base passes and the Al Hearth, that is, in a region where the Cr content in the space is relatively high, the film forming speed is high. , while being adjusted to a slow deposition rate at relatively Al content is high region and in accordance with a target layer thickness of X Cr and X Al, the revolution speed, closest to the hearth of Cr It can be formed by using a triangular wave-shaped speed control pattern that is maximum at the position and minimum at the position closest to the Al hearth. It has been found that the surface-coated drill having the hard coating layer formed as a result exhibits superior lubrication characteristics and wear resistance in wet high-speed deep hole machining as compared with conventional surface-coated drills.
本発明は、前記知見に基づいてなされたものであって、
「（１） 超硬合金焼結体あるいは高速度鋼からなるドリル基体の上に、直接または中間層を介し、最表面に粒径組成制御層として（Ｃｒ１−ｘＡｌｘ）Ｎの成分系からなる層厚０．３〜５．０μｍの硬質被覆層が存在する表面被覆ドリルにおいて、
（ａ）前記ドリルのマージン部の粒径組成制御層の膜断面でのＡｌの含有比率ｘの値が、０．１以上０．６以下の範囲に存在し、ｘの値が０．２以下となる層状のＣｒ高含有領域と、ｘの値が０．３以上となる層状のＡｌ高含有領域が、前記粒径組成制御層の中に各々少なくとも一層以上含まれ、かつ、
（ｂ）前記Ｃｒ高含有領域における結晶粒の平均アスペクト比Ａが、１〜５であり、かつ、
（ｃ）前記Ａｌ高含有領域における結晶粒の平均アスペクト比Ｂが、１０〜７０であること特徴とする長期に亘り高い耐摩耗性を維持する表面被覆ドリル。
（２） 前記Ｃｒ高含有領域の平均層厚ＸＣｒが、３０〜２００ｎｍの範囲に存在し、かつ、前記Ａｌ高含有領域の平均層厚ＸＡｌが、３０〜２００ｎｍの範囲に存在し、かつ、ドリルマージン部におけるＸＣｒが、ドリル先端からドリル外径の５倍の距離までの領域にかけて漸次増加し、かつ、ドリルマージン部におけるＸＡｌが、ドリル先端からドリル外径の５倍の距離までの領域にかけて漸次減少することを特徴とする（１）に記載の表面被覆ドリル。」
に特徴を有するものである。
The present invention has been made based on the above findings,
“(1) (Cr 1-x Al x ) N component system as a particle size composition control layer on the outermost surface directly or via an intermediate layer on a drill base made of cemented carbide sintered body or high speed steel In a surface-coated drill in which a hard coating layer having a layer thickness of 0.3 to 5.0 μm is present,
(A) The value of the Al content ratio x in the film cross section of the grain size composition control layer in the margin portion of the drill is in the range of 0.1 to 0.6, and the value of x is 0.2 or less. A layered Cr high-content region and a layered Al high-content region where the value of x is 0.3 or more are each included in the particle size composition control layer, and
(B) The average aspect ratio A of the crystal grains in the high Cr content region is 1 to 5, and
(C) A surface-coated drill that maintains high wear resistance over a long period of time, wherein the average aspect ratio B of crystal grains in the high Al content region is 10 to 70.
(2) Average layer thickness X Cr of the Cr-rich region is present in the range of 30 to 200 nm, and the average layer thickness X Al of the Al-rich region is present in the range of 30 to 200 nm, and X Cr at the drill margin gradually increases over the region from the drill tip to a distance of 5 times the outer diameter of the drill, and X Al at the drill margin increases from the drill tip to a distance of 5 times the outer diameter of the drill. The surface-coated drill as set forth in (1), wherein the surface-coated drill gradually decreases over a range of. "
It has the characteristics.
本発明について、以下に説明する。 The present invention will be described below.
本発明の表面被覆ドリルのドリル基体の上に、直接または、中間層を介して、（Ｃｒ１−ｘＡｌｘ）Ｎの成分系からなる層厚０．３〜５．０μｍの硬質被覆層を形成する。ここで、硬質被覆層の層厚が０．３μｍ未満では、所望の耐摩耗性が維持できず、一方、５μｍを超えると皮膜のチッピングなどが生じる。したがって、硬質被覆層の層厚は０．３〜５．０μｍと定めた。
また、硬質被覆層の組成（Ｃｒ１−ｘＡｌｘ）Ｎにおいて、Ａｌの含有比率ｘの値が、０．１未満ではＡｌの耐摩耗性が十分でなく、０．６を超えると六方晶組織へと変化するためＮａＣｌ型結晶が持つ強度を維持できない。したがって、Ａｌの含有比率ｘの値は０．１〜０．６と定めた。
A hard coating layer having a layer thickness of 0.3 to 5.0 μm composed of a component system of (Cr 1-x Al x ) N is directly or via an intermediate layer on the drill base of the surface-coated drill of the present invention. Form. Here, if the thickness of the hard coating layer is less than 0.3 μm, desired wear resistance cannot be maintained, while if it exceeds 5 μm, chipping of the film occurs. Therefore, the layer thickness of the hard coating layer is determined to be 0.3 to 5.0 μm.
Further, in the composition of the hard coating layer (Cr 1-x Al x ) N, if the value of the Al content ratio x is less than 0.1, the wear resistance of Al is not sufficient, and if it exceeds 0.6, hexagonal crystals The strength of the NaCl-type crystal cannot be maintained because it changes into a structure. Therefore, the value of the Al content ratio x was determined to be 0.1 to 0.6.
また、Ｃｒ高含有領域における結晶粒の平均アスペクト比Ａの値は、５を超えると粒状組織が持つ安定的な切削性能が実現できない。一方、平均アスペクト比Ａの値は、個々の結晶粒の長辺を短辺で除した値の平均値であるため、１未満にはならない。したがって、平均アスペクト比Ａの値は、１〜５と定めた。
また、Ａｌ高含有領域における結晶粒の平均アスペクト比Ｂの値は、１０未満では、柱状組織が持つ耐摩耗性が実現できない。一方、平均アスペクト比Ｂの値は、７０を超えるとせん断力に対する抗折力が維持できない。したがって、アスペクト比Ｂの値は、１０〜７０と定めた。
In addition, if the average aspect ratio A of the crystal grains in the Cr-rich region exceeds 5, the stable cutting performance of the granular structure cannot be realized. On the other hand, the value of the average aspect ratio A is an average value of values obtained by dividing the long sides of the individual crystal grains by the short sides, and thus does not become less than 1. Therefore, the value of the average aspect ratio A is set to 1-5.
Further, if the average aspect ratio B of the crystal grains in the high Al content region is less than 10, the wear resistance of the columnar structure cannot be realized. On the other hand, if the average aspect ratio B exceeds 70, the bending strength against the shearing force cannot be maintained. Therefore, the value of the aspect ratio B is set to 10 to 70.
Ｃｒ高含有領域の平均層厚ＸＣｒおよびＡｌ高含有領域の平均層厚ＸＡｌの値は、３０ｎｍを下回るとそれぞれが持つ潤滑特性および耐摩耗性が発揮できない。一方、ＸＣｒが２００ｎｍを超えると、Ａｌ高含有領域に比べて耐摩耗性の劣るＣｒ高含有領域の割合が相対的に大きくなり、Ｃｒ高含有領域中での破壊が生じやすくなるために所望の工具性能を維持できず、また、ＸＡｌが２００ｎｍを超えると、Ａｌ高含有領域に導入された圧縮応力の積算値が大きくなりすぎ、皮膜のチッピングの原因となる。したがって、ＸＣｒおよびＸＡｌの値は、３０〜２００ｎｍと定めた。
なお、本発明でいう「アスペクト比」とは、個々の結晶粒の測定された最大径を示す線分である長辺の値を、長辺に対して垂直方向の最大径を示す短辺の値で除した値である。また、平均アスペクト比は、測定した５つの結晶粒のアスペクト比の平均値である。
また、「ドリル先端から、ドリル外径の５倍の距離までの領域」とは、ドリルの中心軸と平行にドリル切れ刃部先端を起点に後方すなわちシャンクの方向へ計測して、ドリルの中心軸に垂直な平面内の最大直径の５倍の長さまでの領域をいう。
また、同一の測定領域に、膜厚方向に複数のＣｒ高含有領域、あるいは複数のＡｌ高含有領域が存在する場合は、それぞれの平均値をＸＣｒ、ＸＡｌとする。
The value of the average layer thickness X Al average layer thickness X Cr and Al-rich region of the Cr-rich region, it can not exhibit lubricating properties and wear resistance with each below the 30 nm. On the other hand, desired when X Cr exceeds 200 nm, the proportion of Cr-rich region is relatively large and poor abrasion resistance as compared with Al-rich region, in order to destroy in a Cr-rich region is likely to occur It can not be maintained for tool performance, and if X Al exceeds 200 nm, the integrated value of the compressive stress introduced in the Al-rich region becomes too large, causing chipping of the coating. Therefore, the value of X Cr and X Al was determined to be 30 to 200 nm.
The “aspect ratio” as used in the present invention refers to the value of the long side, which is a line segment indicating the measured maximum diameter of each crystal grain, and the value of the short side indicating the maximum diameter in the direction perpendicular to the long side. The value divided by the value. The average aspect ratio is an average value of the measured aspect ratios of the five crystal grains.
In addition, the “region from the drill tip to the distance of 5 times the drill outer diameter” means that the center of the drill is measured in the direction of the shank backward from the tip of the drill cutting edge parallel to the center axis of the drill. An area up to 5 times the maximum diameter in a plane perpendicular to the axis.
In addition, when there are a plurality of Cr-rich regions or a plurality of Al-rich regions in the film thickness direction in the same measurement region, the average values are X Cr and X Al .
本発明の表面被覆ドリルは、超硬合金焼結体あるいは高速度鋼からなるドリル基体の上に、直接または中間層を介し、最表面に粒径組成制御層として（Ｃｒ１−ｘＡｌｘ）Ｎの成分系からなる層厚０．３〜５．０μｍの硬質被覆層が存在する表面被覆ドリルにおいて、（ａ）前記ドリルのマージン部の粒径組成制御層の膜断面でのＡｌの含有比率ｘの値が、０．１以上０．６以下の範囲に存在し、ｘの値が０．２以下となる層状のＣｒ高含有領域と、ｘの値が０．３以上となる層状のＡｌ高含有領域が存在し、かつ、（ｂ）前記Ｃｒ高含有領域における結晶粒の平均アスペクト比Ａが、１〜５であり、かつ、（ｃ）前記Ａｌ高含有領域における結晶粒の平均アスペクト比Ｂが、１０〜７０であることによって、長期に亘り高い潤滑特性、耐チッピング性および耐摩耗性を維持する表面被覆ドリルに特徴を有するものである。
さらに、Ｃｒ高含有領域の平均層厚ＸＣｒが、３０〜２００ｎｍの範囲に存在し、かつ、Ａｌ高含有領域の平均層厚ＸＡｌが、３０〜２００ｎｍの範囲に存在し、かつ、ドリルマージン部におけるＸＣｒが、ドリル先端からドリル外径の５倍の距離までの領域にかけて漸次増加し、かつ、ドリルマージン部におけるＸＡｌが、ドリル先端からドリル外径の５倍の距離までの領域にかけて漸次減少するように形成することによって、耐摩耗性をより一層向上させることができる。
すなわち、一般的な深穴加工において、力学的負荷が高くまた同時に高い耐熱性が要求される先端部においては、高いＡｌ含有比率を有するＡｌ高含有領域をＣｒ高含有領域に対して大きい割合で、柱状組織にて構成することにより、長期に亘り高い耐摩耗性を維持する。一方、力学的負荷よりも滑り特性や安定的な摩耗形態が要求される切屑排出溝やドリル後方のマージン部においては、ＣｒＮのもつ潤滑特性をさらに生かすために高いＣｒ含有比率を有するＣｒ高含有領域を、アスペクト比の低い粒状組織で構成することにより、最低限の耐摩耗性を維持したまま長期に亘り高い潤滑特性を維持することができる。また同時に、それらの領域が膜厚方向に層状に積層されていることで、主として柱状組織で構成されるＡｌ高含有領域において発生した膜厚方向へ進展するクラックの進展方向がＣｒ高含有領域の微細粒状組織により分散され、皮膜の耐衝撃性を向上させることが出来る。
さらに、ＸＣｒが、ドリル先端からドリル外径の５倍の距離までの領域にかけて漸次増加し、かつ、ＸＡｌが、ドリル先端からドリル外径の５倍の距離までの領域にかけて漸次減少することで、耐摩耗性が要求される先端部近傍から、潤滑特性が要求される工具後方にかけて、両者の効果をバランスよく発現し、更に工具寿命を延長することが出来る。
さらに、本発明によれば、膜厚方向へ組成比率とアスペクト比が連続的に変化する、あるいは、ドリル軸方向へＸＡｌ、ＸＣｒが漸次変化することで、ブラスト後処理やマスキングによる、不連続的に処理がなされた従来技術よりもきわめて安定的な切削を実現し、長寿命化を実現するものである。一般的な製造方法によれば、Ａｌの含有比率ｘを変化させたとしても、粒状組織・柱状組織はＡｌの含有比率ｘにより被支配的に変化するものではないが、本製法によれば、基体回転機構およびＣｒ蒸発源、Ａｌ蒸発源を極めて特異な配置とし、特定の成膜速度分布および、成膜時の基体表面におけるＣｒイオンやＡｌイオンの特定の密度分布を実現することで、本発明の表面被覆ドリルを制御可能な状態で製造することが出来るものである。
The surface-coated drill of the present invention has a particle size composition control layer (Cr 1-x Al x ) on the outermost surface directly or via an intermediate layer on a drill base made of cemented carbide sintered body or high-speed steel. In a surface-coated drill having a hard coating layer having a layer thickness of 0.3 to 5.0 μm composed of N component system, (a) Al content ratio in a film cross section of a grain size composition control layer in a margin portion of the drill A layered high Cr content region in which the value of x is in the range of 0.1 to 0.6, the value of x being 0.2 or less, and the layered Al having a value of x of 0.3 or more A high content region, and (b) the average aspect ratio A of the crystal grains in the Cr high content region is 1 to 5, and (c) the average aspect ratio of the crystal grains in the Al high content region When B is 10 to 70, high lubrication characteristics and resistance to long-term use The surface coating drill to maintain mappings and abrasion resistance and has a characteristic.
Moreover, the average layer thickness X Cr of Cr-rich region is present in the range of 30 to 200 nm, and the average layer thickness X Al of Al-rich region is present in the range of 30 to 200 nm, and the drill margin X Cr at the drill section gradually increases over a region from the drill tip to a distance of 5 times the drill outer diameter, and X Al at the drill margin section extends from a drill tip to a region of 5 times the drill outer diameter. By forming so as to gradually decrease, the wear resistance can be further improved.
That is, in general deep hole machining, at the tip portion where mechanical load is high and high heat resistance is required at the same time, a high Al content region having a high Al content ratio is larger than a Cr high content region. By configuring with a columnar structure, high wear resistance is maintained over a long period of time. On the other hand, in the chip discharge groove and the margin part behind the drill where slip characteristics and stable wear form are required rather than mechanical load, high Cr content with a high Cr content ratio to further utilize the lubrication characteristics of CrN By configuring the region with a granular structure having a low aspect ratio, it is possible to maintain high lubrication characteristics over a long period while maintaining a minimum wear resistance. At the same time, these regions are layered in the film thickness direction, so that the progress direction of cracks that develop in the film thickness direction generated in the high Al content region mainly composed of a columnar structure is the Cr high content region. Dispersed by the fine granular structure, the impact resistance of the film can be improved.
Furthermore, the X Cr is gradually increased toward the area from the drill tip to five times the distance of the drill outer diameter, and, X Al is gradually reduced toward the area from the drill tip to five times the distance of the drill outer diameter From the vicinity of the tip where wear resistance is required to the rear of the tool where lubrication characteristics are required, the effects of both can be expressed in a balanced manner, and the tool life can be extended.
Furthermore, according to the present invention, the composition ratio and the aspect ratio change continuously in the film thickness direction, or X Al and X Cr gradually change in the drill axis direction, which is not effective due to post-blast treatment or masking. It achieves extremely stable cutting and longer life than the conventional technology that is continuously processed. According to a general manufacturing method, even if the Al content ratio x is changed, the granular structure / columnar structure does not change dominantly depending on the Al content ratio x. The substrate rotation mechanism, the Cr evaporation source, and the Al evaporation source are arranged in a very unique manner to realize a specific film deposition rate distribution and a specific density distribution of Cr ions and Al ions on the substrate surface during film formation. The surface-coated drill of the invention can be manufactured in a controllable state.
つぎに、本発明の表面被覆ドリルを実施例により具体的に説明する。 Next, the surface-coated drill of the present invention will be specifically described with reference to examples.
原料粉末として、平均粒径０．８μｍのＷＣ粉末、同２．３μｍのＣｒ３Ｃ２粉末、同１．５μｍのＶＣ粉末および同１．８μｍのＣｏ粉末を用意し、これら原料粉末をそれぞれ表１に示される配合組成に配合し、さらにワックスを加えてアセトン中で２４時間ボールミル混合し、減圧乾燥した後、１００ＭＰａの圧力で所定形状の各種の圧粉体にプレス成形し、これらの圧粉体を、６Ｐａの真空雰囲気中、７℃／分の昇温速度で１３７０〜１４７０℃の範囲内の所定の温度に昇温し、この温度に１時間保持後、炉冷の条件で焼結して、ドリル基体形成用丸棒焼結体を形成し、さらに前記の丸棒焼結体から、研削加工にて、溝形成部の直径×長さが１０ｍｍ×８０ｍｍの寸法、並びにねじれ角３０度の２枚刃形状をもったＷＣ基超硬合金製のドリル基体Ｄ−１〜Ｄ−４をそれぞれ製造した。 As raw material powders, WC powder having an average particle size of 0.8 μm, 2.3 μm Cr 3 C 2 powder, 1.5 μm VC powder, and 1.8 μm Co powder were prepared. 1 is added to the compounding composition shown in FIG. 1, and a wax is further added, followed by ball mill mixing in acetone for 24 hours, drying under reduced pressure, and then press-molding into various compacts of a predetermined shape at a pressure of 100 MPa. The body is heated to a predetermined temperature in the range of 1370 to 1470 ° C. at a heating rate of 7 ° C./min in a vacuum atmosphere of 6 Pa, held at this temperature for 1 hour, and then sintered under furnace cooling conditions. Then, a round base sintered body for forming a drill base is formed, and from the round bar sintered body, the groove forming portion has a diameter x length of 10 mm x 80 mm and a twist angle of 30 degrees by grinding. Made of WC-based cemented carbide with 2 flute shape Le substrate D-1 to D-4 were prepared, respectively.
ついで、これらのドリル基体Ｄ−１〜Ｄ−４の切刃に、ホーニングを施し、アセトン中で超音波洗浄し、乾燥した状態で、図１の概略図に示される物理蒸着装置の１種である圧力勾配型Ａｒプラズマガンを利用したイオンプレーティング装置に装着し、
ドリル基体温度：４００〜４３０℃、
蒸発源１：金属Ｃｒ、
蒸発源１に対するプラズマガン放電電力：９〜１１ｋＷ、
蒸発源２：金属Ａｌ、
蒸発源２に対するプラズマガン放電電力：７〜８ｋＷ、
反応ガス流量：窒素（Ｎ２）ガス ８０〜１００ｓｃｃｍ、
放電ガス：アルゴン（Ａｒ）ガス ３０〜３５ｓｃｃｍ、
ドリル基体に印加する直流バイアス電圧：−１５〜−１０Ｖ、
という表２に示される特定の条件下、ドリル基体の先端を回転中心に向けた方向で固定し、本発明被覆ドリル１〜１５については公転回転軸をハース積載面の法線から０度、本発明被覆ドリル１６〜３０については３５〜５５度傾けて回転させ、回転速度が、Ｃｒのハースに最も接近する位置で最大、Ａｌのハースに最も接近する位置で最小となる三角波形状の速度制御パターンとして反応性蒸着をして、表２に示される組成、および表４、５に示される目標層厚、平均アスペクト比を有する粒径組成制御層を形成した本発明表面被覆ドリル１〜３０をそれぞれ製造した。
Next, the cutting blades of these drill bases D-1 to D-4 are honed, ultrasonically cleaned in acetone, and dried, with one type of physical vapor deposition apparatus shown in the schematic diagram of FIG. Attached to an ion plating device using a certain pressure gradient type Ar plasma gun,
Drill base temperature: 400-430 ° C.
Evaporation source 1: metal Cr,
Plasma gun discharge power for the evaporation source 1: 9 to 11 kW,
Evaporation source 2: Metal Al,
Plasma gun discharge power for the evaporation source 2: 7 to 8 kW,
Reaction gas flow rate: Nitrogen (N 2 ) gas 80-100 sccm,
Discharge gas: Argon (Ar) gas 30-35 sccm,
DC bias voltage applied to the drill base: -15 to -10 V,
Under the specific conditions shown in Table 2, the tip of the drill base is fixed in the direction toward the center of rotation, and for the present invention coated drills 1-15, the revolution axis of rotation is 0 degrees from the normal of the hearth loading surface. The invention-coated drills 16 to 30 are rotated at an angle of 35 to 55 degrees, and the rotation speed is maximum at a position closest to the Cr hearth, and is minimum at a position closest to the Al hearth. The present invention surface-coated drills 1 to 30 each having a composition shown in Table 2 and a particle size composition control layer having a target layer thickness and an average aspect ratio shown in Tables 4 and 5 are formed. Manufactured.
また、比較の目的で、前記ドリル基体Ｄ−１〜Ｄ−４の表面に、ホーニングを施し、アセトン中で超音波洗浄し、乾燥した状態で、図３に示される、Ｃｒ−Ａｌ合金をターゲットとして取り付けたアークイオンプレーティング装置内にドリル基体を垂直方向に固定した状態で保持し自転させると同時に、該鉛直方向の軸を回転中心軸として公転させながら、
ドリル基体温度：４１０〜４２０℃、
ターゲット１：Ｃｒ−Ａｌ合金、
ターゲット１に対するアーク放電電流：８０〜１４０Ａ、
ターゲット２：Ｃｒ−Ａｌ合金、
ターゲット２に対するアーク放電電流：６０〜１２０Ａ、
反応ガス圧力：窒素（Ｎ２）ガス ６〜１０Ｐａ、
ドリル基体に印加する直流バイアス電圧：−２５〜−５Ｖ、
という条件のもと、従来被覆層を蒸着形成して、ドリル基体Ｄ−１〜Ｄ−４の表面に、表３に示される組成、および、表６に示される目標層厚、平均アスペクト比を有する従来層を形成した比較表面被覆ドリル１〜８をそれぞれ製造した。
For comparison purposes, the surfaces of the drill bases D-1 to D-4 are subjected to honing, ultrasonically cleaned in acetone, and dried, and the target is a Cr—Al alloy shown in FIG. While holding and rotating in a state where the drill base is fixed in the vertical direction in the arc ion plating apparatus attached as, while revolving around the axis in the vertical direction as the rotation center axis,
Drill base temperature: 410-420 ° C.
Target 1: Cr-Al alloy,
Arc discharge current for target 1: 80-140A,
Target 2: Cr—Al alloy,
Arc discharge current for target 2: 60-120A
Reaction gas pressure: Nitrogen (N 2 ) gas 6-10 Pa,
DC bias voltage applied to the drill base: −25 to −5V,
Under the conditions, a conventional coating layer is formed by vapor deposition, and the composition shown in Table 3 and the target layer thickness and average aspect ratio shown in Table 6 are formed on the surfaces of the drill bases D-1 to D-4. Comparative surface-coated drills 1 to 8 each having a conventional layer were manufactured.
つぎに、前記本発明表面被覆ドリル１〜３０および比較表面被覆ドリル１〜８について、
被削材−平面寸法：１００ｍｍ×２５０ｍｍ、厚さ：８０ｍｍのＪＩＳ・ＳＣ５５（ＨＢ２６０）の板材、
切削速度：１３０ｍ／ｍｉｎ．、
送り：０．３０ｍｍ／ｒｅｖ．、
穴深さ：５０ｍｍ、
の条件での合金鋼の湿式高速深穴あけ切削加工試験（通常の、加工穴深さ５Ｄの切削速度および送りは、それぞれ、１１０ｍ／ｍｉｎ．および０．２０ｍｍ／ｒｅｖ．）、
を行い、先端切刃面の逃げ面摩耗幅が０．３ｍｍに至るまで、若しくは工具の欠損に至るまでの穴あけ加工数を測定した。この測定結果を表４、５、６にそれぞれ示した。
Next, for the surface-coated drills 1 to 30 and the comparative surface-coated drills 1 to 8 of the present invention,
Work material-planar dimensions: 100 mm × 250 mm, thickness: 80 mm JIS / SC55 (HB260) plate material,
Cutting speed: 130 m / min. ,
Feed: 0.30 mm / rev. ,
Hole depth: 50mm,
Wet high-speed deep drilling machining test of alloy steel under the conditions of (normal cutting speed and feed rate of drilling hole depth 5D are 110 m / min. And 0.20 mm / rev., Respectively),
Then, the number of drilling operations was measured until the flank wear width of the tip cutting edge surface reached 0.3 mm or until the tool was broken. The measurement results are shown in Tables 4, 5, and 6, respectively.
この結果得られた本発明表面被覆ドリル１〜３０の硬質被覆層を構成する粒径組成制御層、さらに、比較表面被覆ドリル１〜８の硬質被覆層を構成する従来層の平均層厚を、走査型電子顕微鏡を用いて断面測定したところ、いずれも目標層厚と実質的に同じ平均値（５ヶ所の平均値）を示した。 The particle diameter composition control layer constituting the hard coating layer of the surface coating drills 1 to 30 of the present invention obtained as a result, and further the average layer thickness of the conventional layer constituting the hard coating layer of the comparative surface coating drills 1 to 8, When the cross-section was measured using a scanning electron microscope, all showed the same average value (average value of five locations) as the target layer thickness.
さらに、本発明表面被覆ドリル１〜３０、比較表面被覆ドリル１〜８を集束イオンビーム加工装置により、層厚方向に
高さ：層厚の２倍相当 × 幅：５μｍ × 厚さ：１００ｎｍ
の薄片に加工した後、透過型電子顕微鏡を用いて、観察加速電圧２００ｋＶの条件のもと、本発明表面被覆ドリル１〜３０の硬質被覆層を構成する粒径組成制御層、比較表面被覆ドリル１〜８の硬質被覆層を構成する従来層の粒径組織を観測したのち、薄片の幅方向における中心線とドリル基体の交差点から、ドリル基体に略垂直に皮膜の表面の方向へ向かって、１０ｎｍの間隔で組成を測定し、各点での組成が表２、３に示す目標組成範囲と実質的に同じ組成範囲を有していることを確認するとともに、さらに、Ａｌの含有比率ｘが０．１以上０．２以下となるＣｒ高含有領域の平均層厚ＸＣｒおよび、Ｃｒ高含有領域に含まれる（Ｃｒ１−ｘＡｌｘ）Ｎの成分系からなる個々の結晶粒の長辺および短辺を測定し、平均アスペクト比Ａを算出し、同じく、Ａｌの含有比率ｘが０．３以上０．６以下となるＡｌ高含有領域の平均層厚ＸＡｌおよび、Ａｌ高含有領域に含まれる（Ｃｒ１−ｘＡｌｘ）Ｎの成分系からなる個々の結晶粒の長辺および短辺を測定し、平均アスペクト比Ｂを算出し、それぞれの結果を表４、５、６に示した。なお、ここで言う長辺とは結晶粒中の最大の長さを示す線分の長さを表し、短辺とは、長辺に垂直な線分のうち最大の長さもつ線分の長さを表し、アスペクト比とは前記長辺を前記短辺で除した値である。
Further, the surface-coated drills 1 to 30 and the comparative surface-coated drills 1 to 8 according to the present invention are height-wise equivalent to twice the layer thickness in the layer thickness direction by a focused ion beam processing apparatus. × width: 5 μm × thickness: 100 nm
After being processed into a thin piece, a particle size composition control layer constituting a hard coating layer of the surface coating drills 1 to 30 of the present invention and a comparative surface coating drill under the condition of an observation acceleration voltage of 200 kV using a transmission electron microscope After observing the grain size structure of the conventional layer constituting the hard coating layer of 1 to 8, from the intersection of the center line in the width direction of the flake and the drill base, toward the surface of the film substantially perpendicular to the drill base, The composition was measured at intervals of 10 nm, and it was confirmed that the composition at each point had substantially the same composition range as the target composition range shown in Tables 2 and 3. Further, the Al content ratio x was the average layer of Cr-rich region of 0.1 to 0.2 thickness X Cr and, included in the Cr-rich region (Cr 1-x Al x) N individual crystal grains of the long sides consisting of component systems Measure the short side and average aspect ratio A Calculated, similarly, Al content ratio x is 0.3 or more 0.6 Al high average layer thickness X Al-containing region and that the following are included in the Al-rich region of (Cr 1-x Al x) N The long side and the short side of each crystal grain composed of the component system were measured, the average aspect ratio B was calculated, and the respective results are shown in Tables 4, 5, and 6. In addition, the long side said here represents the length of the line segment which shows the maximum length in a crystal grain, and a short side is the length of the line segment with the maximum length among the line segments perpendicular to the long side. The aspect ratio is a value obtained by dividing the long side by the short side.
表２、４、５に示される結果から、本発明表面被覆ドリルは、最表面に（Ｃｒ１−ｘＡｌｘ）Ｎの成分系からなる粒径組成制御層が形成されており、その平均層厚が０．３〜５μｍであり、ドリルのマージン部の粒径組成制御層の膜断面でのＡｌの含有比率ｘが、０．１〜０．６の範囲に存在し、ｘの値が０．２以下となる層状のＣｒ高含有領域とｘの値が０．３以上となる層状のＡｌ高含有領域が存在し、かつ、Ｃｒ高含有領域における結晶粒の平均アスペクト比Ａが、１〜５であり、かつ、Ａｌ高含有領域における結晶粒の平均アスペクト比Ｂが、１０〜７０であることにより、長期に亘りすぐれた潤滑特性と耐摩耗性を維持する表面被覆ドリルが得られることが明らかである。
また、Ｃｒ高含有領域の平均層厚ＸＣｒが、３０〜２００ｎｍの範囲に存在し、かつ、Ａｌ高含有領域の平均層厚ＸＡｌが、３０〜２００ｎｍの範囲に存在し、かつ、ドリルマージン部におけるＸＣｒが、ドリル先端からドリル外径の５倍の距離までの領域にかけて漸次増加し、かつ、ドリルマージン部におけるＸＡｌが、ドリル先端からドリル外径の５倍の距離までの領域にかけて漸次減少していることにより、さらに一層、長期に亘りすぐれた潤滑特性と耐摩耗性を維持する表面被覆ドリルが得られることが明らかである。
これに対して、表３、６に示される結果から、硬質被覆層のＣｒとＡｌそれぞれの高含有領域がない、あるいは、ＣｒとＡｌそれぞれの高含有領域の平均アスペクト比および平均層厚が所定の範囲内に制御されていない従来層を有する比較表面被覆ドリルにおいては、潤滑特性および耐摩耗性が十分でないために、チッピング、欠損、剥離の発生等により、比較的短時間で使用寿命に至ることが明らかである。
From the results shown in Tables 2, 4 and 5, in the surface-coated drill of the present invention, the particle size composition control layer composed of the component system of (Cr 1-x Al x ) N is formed on the outermost surface, and the average layer thereof The thickness is 0.3 to 5 μm, the Al content ratio x in the film cross section of the grain size composition control layer in the margin portion of the drill is in the range of 0.1 to 0.6, and the value of x is 0 .2 or less layered Cr high content region and x value of 0.3 or more layered Al high content region exists, and the average aspect ratio A of the crystal grains in the Cr high content region is 1 to 5 and the average aspect ratio B of the crystal grains in the Al-rich region is 10 to 70, it is possible to obtain a surface-coated drill that maintains excellent lubrication characteristics and wear resistance over a long period of time. it is obvious.
The average layer thickness X Cr of Cr-rich region is present in the range of 30 to 200 nm, and the average layer thickness X Al of Al-rich region is present in the range of 30 to 200 nm, and the drill margin X Cr at the drill section gradually increases over a region from the drill tip to a distance of 5 times the drill outer diameter, and X Al at the drill margin section extends from a drill tip to a region of 5 times the drill outer diameter. It is clear that the gradual decrease results in a surface-coated drill that maintains even better lubricating properties and wear resistance over the long term.
On the other hand, from the results shown in Tables 3 and 6, there is no high content region of Cr and Al in the hard coating layer, or the average aspect ratio and average layer thickness of the high content region of Cr and Al are predetermined. In comparison surface-coated drills with conventional layers that are not controlled within the range, the lubrication characteristics and wear resistance are not sufficient, so that the service life is reached in a relatively short time due to chipping, chipping, peeling, etc. It is clear.
前述のように、本発明の表面被覆ドリルは、超硬合金焼結体あるいは高速度鋼からなるドリル基体の上に、直接または中間層を介し、最表面に粒径組成制御層として（Ｃｒ１−ｘＡｌｘ）Ｎの成分系からなる平均層厚０．３〜５．０μｍの硬質被覆層が存在し、ドリルのマージン部の粒径組成制御層の膜断面でのＡｌの含有比率ｘの値が、０．１以上０．６以下の範囲に存在し、ｘの値が０．２以下となる層状のＣｒ高含有領域と、ｘの値が０．３以上となる層状のＡｌ高含有領域が、粒径組成制御層の中に各々少なくとも一層以上含まれ、かつ、Ｃｒ高含有領域における結晶粒の平均アスペクト比Ａが１〜５であり、かつ、Ａｌ高含有領域における結晶粒の平均アスペクト比Ｂが１０〜７０であることにより、すぐれた潤滑特性を備えており、そして、このすぐれた潤滑特性は、湿式高速の深穴用ドリル加工条件においても、長期間に亘り高い耐摩耗性を維持するものである。 As described above, the surface-coated drill of the present invention has a particle size composition control layer (Cr 1) on the outermost surface directly or via an intermediate layer on a drill base made of cemented carbide sintered body or high-speed steel. -x Al x) hard coating layer having an average layer thickness 0.3~5.0μm consisting component system of N are present, the content ratio x of Al in the film cross-section of the particle size composition control layer of the margin of the drill A layered high Cr content region where the value is in the range of 0.1 to 0.6, and the value of x is 0.2 or less, and the layered Al content of x is 0.3 or more The regions are included in the grain size composition control layer at least one or more, the average aspect ratio A of the crystal grains in the Cr-rich region is 1 to 5, and the average grain size in the Al-rich region With aspect ratio B of 10 to 70, it has excellent lubrication characteristics Ri, and this excellent lubricating properties, even in wet fast deep hole drill processing conditions, is to maintain high wear resistance for a long period of time.
Claims (2)
（ａ）前記ドリルのマージン部の粒径組成制御層のＡｌの含有比率ｘの値が、
０．１以上０．６以下の範囲であり、ｘの値が０．２以下となる層状のＣｒ高含有領域と、ｘの値が０．３以上となる層状のＡｌ高含有領域が、前記粒径組成制御層の中に各々少なくとも一層以上含まれ、かつ、
（ｂ）前記Ｃｒ高含有領域における結晶粒の平均アスペクト比Ａが、１〜５であり、かつ、
（ｃ）前記Ａｌ高含有領域における結晶粒の平均アスペクト比Ｂが、１０〜７０であること特徴とする長期に亘り高い耐摩耗性を維持する表面被覆ドリル。 An average layer made of a component system of (Cr 1-x Al x ) N as a particle size composition control layer on the outermost surface directly or via an intermediate layer on a drill base made of cemented carbide sintered body or high-speed steel In a surface-coated drill having a hard coating layer having a thickness of 0.3 to 5.0 μm,
(A) The value of the Al content ratio x of the grain size composition control layer in the margin part of the drill is
The layered high Cr content region in the range of 0.1 to 0.6, the value of x being 0.2 or less, and the layered Al high content region of x value being 0.3 or more, At least one layer in each of the particle size composition control layers, and
(B) The average aspect ratio A of the crystal grains in the high Cr content region is 1 to 5, and
(C) A surface-coated drill that maintains high wear resistance over a long period of time, wherein the average aspect ratio B of crystal grains in the high Al content region is 10 to 70.
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