JP3922128B2 - Cutting tool made of surface-coated cemented carbide that exhibits excellent chipping resistance and wear resistance under high-speed heavy cutting conditions. - Google Patents
Cutting tool made of surface-coated cemented carbide that exhibits excellent chipping resistance and wear resistance under high-speed heavy cutting conditions. Download PDFInfo
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【０００１】
【発明の属する技術分野】
この発明は、硬質被覆層が高強度を有し、かつ高温硬さと耐熱性にもすぐれ、したがって特に各種の鋼や鋳鉄などの高速切削加工を、高い熱的機械的衝撃を伴う高切り込みや高送りなどの重切削条件で行なった場合にも、硬質被覆層がすぐれた耐チッピング性および耐摩耗性を発揮する表面被覆超硬合金製切削工具（以下、被覆超硬工具という）に関するものである。
【０００２】
【従来の技術】
一般に、被覆超硬工具には、各種の鋼や鋳鉄などの被削材の旋削加工や平削り加工にバイトの先端部に着脱自在に取り付けて用いられるスローアウエイチップ、穴あけ切削加工などに用いられるドリルやミニチュアドリル、さらに面削加工や溝加工、肩加工などに用いられるソリッドタイプのエンドミルなどがあり、また前記スローアウエイチップを着脱自在に取り付けて前記ソリッドタイプのエンドミルと同様に切削加工を行うスローアウエイエンドミル工具などが知られている。
【０００３】
また、被覆超硬工具として、例えば特開昭５２−１０５３９６号公報に記載されるように、炭化タングステン（以下、ＷＣで示す）基超硬合金または炭窒化チタン（以下、ＴｉＣＮで示す）基サーメットからなる基体（以下、これらを総称して超硬基体と云う）の表面に、個々の層厚が１μm以下のＡｌ酸化物（以下、Ａｌ2Ｏ3で示す）層とＴｉ窒化物（以下、ＴｉＮで示す）層とを交互積層して、５〜２５μｍの全体平均層厚で蒸着してなる被覆超硬工具が提案され、前記硬質被覆層を構成するＡｌ2Ｏ3−ＴｉＮ交互積層が、Ａｌ2Ｏ3層による高温硬さおよび耐熱性と、ＴｉＮ層による強度を具備することから、かかる被覆超硬工具を各種の鋼や鋳鉄などの連続切削や断続切削加工に用いた場合にすぐれた切削性能を発揮することも知られている。
【０００４】
さらに、上記の被覆超硬工具が、例えば図１に概略縦断面図で示される通り、中央部にステンレス鋼製の反応ガス吹き出し管が立設され、前記反応ガス吹き出し管には、図２（ａ）に概略斜視図で、同（ｂ）に概略平面図で例示される黒鉛製の超硬基体支持パレットが串刺し積層嵌着され、かつこれらがステンレス鋼製のカバーを介してヒーターで加熱される構造を有する化学蒸着装置を用い、超硬基体を前記超硬基体支持パレットの底面に形成された多数の反応ガス通過穴位置に図示される通りに載置した状態で前記化学蒸着装置に装入し、ヒータで装置内を、例えば８００〜１１００℃の範囲内の所定の温度に加熱した後、Ａｌ2Ｏ3層形成には、反応ガスとして、容量％で（以下、反応ガスの％は容量％を示す）、
ＡｌＣｌ3：２〜７％、
ＣＯ2：２〜１０％、
ＨＣｌ：３〜７％、
Ｈ2：残り、
からなる組成を有する反応ガスを用い、また、ＴｉＮ層形成には、
ＴｉＣｌ4：１〜３％、
Ｎ2：４０〜６０％、
Ｈ2：残り、
からなる組成を有する反応ガスを用い、これらの反応ガスを予め真空排気された装置内に前記反応ガス吹き出し管を通して、装置内の反応ガス圧力を７〜４０ｋＰａの範囲内の所定の圧力に保持しながら、交互に導入することによりＡｌ2Ｏ3−ＴｉＮ交互積層からなる硬質被覆層を形成することにより製造されることも知られている。
【０００５】
【発明が解決しようとする課題】
近年の切削加工装置の高性能化はめざましく、一方で切削加工に対する省力化および省エネ化、さらに低コスト化の要求は強く、これに伴い、切削加工は高速化の傾向を強め、かつ高切り込みや高送りなどの重切削条件での切削加工を余儀なくされる傾向にあるが、上記の従来被覆超硬工具においては、これを高い熱的機械的衝撃を伴う高切り込みや高送りなどの重切削を高速で行なうのに用いると、特にＡｌ2Ｏ3−ＴｉＮ交互積層からなる硬質被覆層のＡｌ2Ｏ3層はすぐれた高温硬さおよび耐熱性を有するものの強度が不十分であるために、高速重切削ではこれが破壊の起点となることから、チッピング（微小割れ）発生の原因となり、また同じくＴｉＮ層は高強度を有するものの高温硬さおよび耐熱性の低いものであることから、高速重切削では摩耗進行が急速に促進されるようになり、この結果比較的短時間で使用寿命に至るのが現状である。
【０００６】
【課題を解決するための手段】
そこで、本発明者等は、上述のような観点から、特に高速重切削加工で硬質被覆層がすぐれた耐チッピング性および耐摩耗性を発揮する被覆超硬工具を開発すべく、研究を行った結果、
（ａ）上記の図１，２に示される化学蒸着装置を用いて、上記の従来被覆超硬工具の硬質被覆層の構成成分であるＡｌ2Ｏ3とＴｉＮの複合化合物、すなわちＡｌとＴｉの複合窒酸化物（以下、Ａｌ−Ｔｉ窒酸化物という）層を形成するに際して、例えば図３に反応ガス組成自動制御システムが概略チャート図で示される通り、反応ガス組成および流量中央制御装置に、前記Ａｌ−Ｔｉ窒酸化物層からなる硬質被覆層に層厚方向にそってＡｌおよび酸素の最高含有点とＴｉおよび窒素の最高含有点とを所定間隔をおいて交互に繰り返し形成させる目的で、前記Ａｌおよび酸素の最高含有点並びにＴｉおよび窒素の最高含有点に対応した反応ガス組成、並びに前記両点間のＡｌと酸素およびＴｉと窒素の連続変化に対応した反応ガス組成、さらに前記両点間の間隔を、過去の実績データに基づいてインプットし、この反応ガス組成および流量中央制御装置からの制御信号にしたがって、原料ガスボンベからのＨ2ガス、ＣＯ2ガス、Ｎ2ガス、およびＨＣｌガスの流量、さらにＡｌＣｌ3ガスおよびＴｉＣｌ4ガスの流量をそれぞれの原料ガス流量自動制御装置にて制御しながら、化学蒸着装置の反応ガス吹き出し管に導入すると、層厚方向にそって、Ａｌおよび酸素の最高含有点とＴｉおよび窒素の最高含有点とが所定間隔をおいて交互に繰り返し存在し、かつ前記Ａｌおよび酸素の最高含有点から前記Ｔｉおよび窒素お最高含有点、前記Ｔｉおよび窒素の最高含有点から前記Ａｌおよび酸素の最高含有点へＡｌと酸素およびＴｉと窒素の含有量が連続的に変化する成分濃度分布構造をもつたＡｌ−Ｔｉ窒酸化物層からなる硬質被覆層が形成されるようになること。
【０００７】
（ｂ）上記（ａ）の繰り返し連続変化成分濃度分布構造のＡｌ−Ｔｉ窒酸化物層において、
上記Ａｌおよび酸素の最高含有点におけるＡｌとＴｉおよび酸素と窒素の相互含有割合を示すＡｌ／（Ａｌ＋Ｔｉ）および酸素／（酸素＋窒素）を、それぞれ原子比で、
Ａｌ／（Ａｌ＋Ｔｉ）：０．８０〜０．９８、
酸素／（酸素＋窒素）：０．８０〜０．９８、
上記Ｔｉおよび窒素の最高含有点におけるＴｉとＡｌおよび窒素と酸素の相互含有割合を示すＴｉ／（Ｔｉ＋Ａｌ）および窒素／（窒素＋酸素）を、それぞれ原子比で、
Ｔｉ／（Ｔｉ＋Ａｌ）：０．８０〜０．９８、
窒素／（窒素＋酸素）：０．８０〜０．９８、
とし、かつ隣り合う上記Ａｌおよび酸素の最高含有点と上記Ｔｉおよび窒素の最高含有点の厚さ方向の間隔を０．０１〜０．２μmとすると、
上記Ａｌおよび酸素の最高含有点部分では、Ａｌ2Ｏ3のもつ高温硬さと耐熱性に相当するすぐれた高温硬さと耐熱性を示し、一方上記Ｔｉおよび窒素の最高含有点部分では、ＴｉＮのもつ強度に相当する高強度が確保され、かつこれらＡｌおよび酸素の最高含有点と上記Ｔｉおよび窒素の最高含有点の間隔をきわめて小さくしたことから、層全体の特性としてすぐれた高温硬さと耐熱性、および高強度を具備するようになり、さらに前記両点間でＡｌと酸素およびＴｉと窒素の含有量が連続的に変化（成分濃度分布構造）することにより、破壊の起点が存在しないことになり、したがって、硬質被覆層がかかる構成のＡｌ−Ｔｉ窒酸化物層からなる被覆超硬工具は、特に各種の鋼や鋳鉄などの切削加工を、高速で、かつ高い熱的機械的衝撃を伴う高切り込みや高送りなどの重切削条件で行なった場合にも、硬質被覆層がすぐれた耐チッピング性および耐摩耗性を発揮するようになること。
以上（ａ）および（ｂ）に示される研究結果を得たのである。
【０００８】
この発明は、上記の研究結果に基づいてなされたものであって、超硬基体の表面に、Ａｌ−Ｔｉ窒酸化物層からなる硬質被覆層を５〜２５μｍの全体平均層厚で蒸着してなる被覆超硬工具において、
上記硬質被覆層が、層厚方向にそって、Ａｌおよび酸素の最高含有点とＴｉおよび窒素の最高含有点とが所定間隔をおいて交互に繰り返し存在し、かつ前記Ａｌおよび酸素の最高含有点から前記Ｔｉおよび窒素の最高含有点、前記Ｔｉおよび窒素の最高含有点から前記Ａｌおよび酸素の最高含有点へＡｌとＴｉおよび窒素と酸素の含有量が連続的に変化する成分濃度分布構造を有し、
さらに、上記Ａｌおよび酸素の最高含有点におけるＡｌとＴｉおよび酸素と窒素の相互含有割合を示すＡｌ／（Ａｌ＋Ｔｉ）および酸素／（酸素＋窒素）が、それぞれ原子比で、
Ａｌ／（Ａｌ＋Ｔｉ）：０．８０〜０．９８、
酸素／（酸素＋窒素）：０．８０〜０．９８、
上記Ｔｉおよび窒素の最高含有点におけるＴｉとＡｌおよび窒素と酸素の相互含有割合を示すＴｉ／（Ｔｉ＋Ａｌ）および窒素／（窒素＋酸素）が、それぞれ原子比で、
Ｔｉ／（Ｔｉ＋Ａｌ）：０．８０〜０．９８、
窒素／（窒素＋酸素）：０．８０〜０．９８、
を満足し、かつ隣り合う上記Ａｌおよび酸素の最高含有点と上記Ｔｉおよび窒素の最高含有点の間隔が、０．０１〜０．２μmである、
高速重切削条件で硬質被覆層がすぐれた耐チッピング性および耐摩耗性を発揮する被覆超硬工具に特徴を有するものである。
【０００９】
つぎに、この発明の被覆超硬工具において、これを構成する硬質被覆層の構成を上記の通りに限定した理由を説明する。
（ａ）Ａｌおよび酸素の最高含有点
Ａｌ−Ｔｉ窒酸化物層のＴｉおよび窒素成分には強度を向上させ、同Ａｌおよび酸素成分には高温硬さおよび耐熱性を向上させる作用があり、したがってＡｌおよび酸素の最高含有点ではＡｌおよび酸素の含有割合を相対的に高くして高温硬さおよび耐熱性を向上させることにより、高熱発生を伴う高速切削に適合するものとするが、この場合ＡｌとＴｉおよび酸素と窒素の相互含有割合を示すＡｌ／（Ａｌ＋Ｔｉ）および酸素／（酸素＋窒素）がいずれも原子比で（以下、同じ）０．９８を越えると、実質的にＡｌ酸化物で構成されるようになることから、高強度を有するＴｉと窒素の最高含有点が隣接して存在しても層自体の強度の低下は避けられず、この結果チッピングなどが発生し易くなり、一方同値が０．８０未満になると高温硬さおよび耐熱性が急激に低下し、摩耗促進の原因となることから、Ａｌ／（Ａｌ＋Ｔｉ）および酸素／（酸素＋窒素）の値をいずれも０．８０〜０．９８と定めた。
【００１０】
（ｂ）Ｔｉおよび窒素の最高含有点
上記の通りＡｌおよび酸素の最高含有点は相対的にすぐれた高温硬さおよび耐熱性を有するが、反面相対的に強度が不十分であるため、このＡｌおよび酸素の最高含有点の強度不足を補う目的で、高強度を有するＴｉおよび窒素の最高含有点を厚さ方向に交互に介在させるものである。しかし、ＴｉとＡｌおよび窒素と酸素の相互含有割合を示すＴｉ／（Ｔｉ＋Ａｌ）および窒素／（窒素＋酸素）が、それぞれ０．９８を越えると、実質的にＴｉ窒化物で構成されるようになることから、Ｔｉおよび窒素の最高含有点に所定の高温硬さおよび耐熱性を確保することができず、これが摩耗促進の原因となり、一方同値が０．８０未満になると、所望のすぐれた強度を確保することができず、この結果チッピングが発生し易くなることから、Ｔｉ／（Ｔｉ＋Ａｌ）および窒素／（窒素＋酸素）の値をいずれも０．８０〜０．９８と定めた。
【００１１】
（ｃ）Ａｌおよび酸素の最高含有点とＴｉおよび窒素の最高含有点間の間隔
その間隔が０．０１μm未満ではそれぞれの点を上記の組成で明確に形成することが困難であり、この結果層に所望のすぐれた高温硬さおよび耐熱性、さらに高強度を確保することができなくなり、またその間隔が０．２μmを越えるとそれぞれの点がもつ欠点、すなわちＡｌおよび酸素の最高含有点であれば強度不足、Ｔｉおよび窒素の最高含有点であれば高温硬さおよび耐熱性不足が層内に局部的に現れ、これが原因でチッピングが発生し易くなったり、摩耗進行が促進されるようになることから、その間隔を０．０１〜０．２μmと定めた。
【００１２】
（ｄ）硬質被覆層の全体平均層厚
その層厚が５μｍ未満では、所望の耐摩耗性を確保することができず、一方その平均層厚が２５μｍを越えると、チッピングが発生し易くなることから、その平均層厚を５〜２５μｍと定めた。
【００１３】
【発明の実施の形態】
つぎに、この発明の被覆超硬工具を実施例により具体的に説明する。
（実施例１）
原料粉末として、いずれも１〜３μｍの平均粒径を有するＷＣ粉末、ＴｉＣ粉末、ＶＣ粉末、ＴａＣ粉末、ＮｂＣ粉末、Ｃｒ3 Ｃ2 粉末、およびＣｏ粉末を用意し、これら原料粉末を、表１に示される配合組成に配合し、ボールミルで７２時間湿式混合し、乾燥した後、１００ＭＰａ の圧力で圧粉体にプレス成形し、この圧粉体を６Ｐａの真空中、温度：１４００℃に１時間保持の条件で焼結し、焼結後、切刃部分にＲ：０．０３のホーニング加工を施してＩＳＯ規格・ＣＮＭＧ１６０６０８のチップ形状をもったＷＣ基超硬合金製の超硬基体Ａ１〜Ａ１０を形成した。
【００１４】
また、原料粉末として、いずれも０．５〜２μｍの平均粒径を有するＴｉＣＮ（重量比でＴｉＣ／ＴｉＮ＝５０／５０）粉末、Ｍｏ2 Ｃ粉末、ＺｒＣ粉末、ＮｂＣ粉末、ＴａＣ粉末、ＷＣ粉末、Ｃｏ粉末、およびＮｉ粉末を用意し、これら原料粉末を、表２に示される配合組成に配合し、ボールミルで２４時間湿式混合し、乾燥した後、１００ＭＰａの圧力で圧粉体にプレス成形し、この圧粉体を２ｋＰａの窒素雰囲気中、温度：１５００℃に１時間保持の条件で焼結し、焼結後、切刃部分にＲ：０．０３のホーニング加工を施してＩＳＯ規格・ＣＮＭＧ１６０６１２のチップ形状をもったＴｉＣＮ系サーメット製の超硬基体Ｂ１〜Ｂ６を形成した。
【００１５】
つぎに、上記の超硬基体Ａ１〜Ａ１０およびＢ１〜Ｂ６のそれぞれを、アセトン中で超音波洗浄し、乾燥した後、図１に示される化学蒸着装置内に、第２図に示される超硬基体支持パレットの位置決め穴に載置した状態で装入し、まず、装置内をヒーターで９００℃に加熱したところで、ＴｉＣｌ4：４．２％、Ｎ2：３０％、Ｈ2：残りからなる組成を有する反応ガスを反応ガス吹き出し管を通して導入して、装置内の反応雰囲気圧力を３０ｋＰａとし、この状態で３０分間保持して下地密着層として０．３μmの平均層厚をもった窒化チタン（ＴｉＮ）層を形成し、ついで、同じく装置内の雰囲気温度をヒーターにて加熱して１０２０℃とした後、図３に示される反応ガス組成自動制御システムの反応ガス組成および流量中央制御装置に、過去の実績にデータにしたがって、表３に示されるＡｌおよび酸素の最高含有点の目標Ａｌ／（Ａｌ＋Ｔｉ）および酸素／（酸素＋窒素）、さらにＴｉおよび窒素の最高含有点の目標Ｔｉ／（Ｔｉ＋Ａｌ）および窒素／（窒素＋酸素）に対応する反応ガス組成、前記Ａｌおよび酸素の最高含有点とＴｉおよび窒素の最高含有点間のＡｌとＴｉおよび酸素と窒素の含有量の連続変化に対応する反応ガス組成、さらに表４、５に示される前記両点間の目標間隔および硬質被覆層の目標全体層厚をインプットし、この反応ガス組成および流量中央制御装置からの信号にしたがって作動するコントロールバルブ内蔵の原料ガス流量自動制御装置を通して、原料ガスであるＨ2ガス、Ｎ2ガス、ＣＯ2ガス、およびＨＣｌガス、さらにＡｌＣｌ3ガスおよびＴｉＣｌ4ガス（この場合、ＡｌＣｌ3ガスは、ＡｌＣｌ3ガス発生器で金属Ａｌと流量制御されたＨＣｌガスを反応させることにより形成され、また、ＴｉＣｌ4ガスは、図示の通り流量制御されたＨ2ガスをキャリアガスとしてＴｉＣｌ4ガス発生器に送り、ここで液体から気化されたＴｉＣｌ4ガスと共に原料ガス流量自動制御装置に送られる）を、それぞれのガス流量を制御しながら、図１の化学蒸着装置の反応ガス吹き出し管から装置内に導入し（装置内の反応雰囲気圧力は常に７ｋＰａに保持される）、もって前記超硬基体の表面に、層厚方向に沿って表３，４に示される目標Ａｌ／（Ａｌ＋Ｔｉ）および酸素／（酸素＋窒素）のＡｌおよび酸素の最高含有点と、目標Ｔｉ／（Ｔｉ＋Ａｌ）および窒素／（窒素＋酸素）のＴｉおよび窒素の最高含有点とが交互に同じく表３，４に示される目標間隔で繰り返し存在し、かつ前記Ａｌおよび酸素の最高含有点から前記Ｔｉおよび窒素の最高含有点、前記Ｔｉおよび窒素の最高含有点から前記Ａｌおよび酸素の最高含有点へＡｌとＴｉおよび酸素と窒素の含有量がそれぞれ連続的に変化する成分濃度分布構造を有し、かつ同じく表３，４に示される目標全体層厚の硬質被覆層を蒸着することにより、本発明被覆超硬工具としての本発明表面被覆超硬合金製スローアウエイチップ（以下、本発明被覆超硬チップと云う）１〜１６をそれぞれ製造した。
【００１６】
また、比較の目的で、これら超硬基体Ａ１〜Ａ１０およびＢ１〜Ｂ６を、アセトン中で超音波洗浄し、乾燥した後、同じくそれぞれ図１，２に示される通常の化学蒸着装置に装入し、Ａｌ2Ｏ3層の形成条件を、
反応ガス組成：ＡｌＣｌ3：３％、ＣＯ2：７％、ＨＣｌ：３％、Ｈ2：残り、
反応雰囲気温度：１０００℃、
反応雰囲気圧力：７ｋＰａ、
とし、また、ＴｉＮ層の形成条件を、
反応ガス組成：ＴｉＣｌ4：２％、Ｎ2：５５％、Ｈ2：残り、
反応雰囲気温度：１０００℃、
反応雰囲気圧力：１３ｋＰａ、
として、それぞれ表６，７に示される目標層厚のＡｌ2Ｏ3層およびＴｉＮ層の交互積層からなる硬質被覆層を、前記超硬基体Ａ１〜Ａ１０およびＢ１〜Ｂ６のそれぞれの表面に、同じく表６，７に示される目標全体層厚で蒸着することにより、従来被覆超硬工具としての従来表面被覆超硬合金製スローアウエイチップ（以下、従来被覆超硬チップと云う）１〜１６をそれぞれ製造した。
【００１７】
つぎに、上記本発明被覆超硬チップ１〜１６および従来被覆超硬チップ１〜１６について、これを工具鋼製バイトの先端部に固定治具にてネジ止めした状態で、
被削材：ＪＩＳ・ＳＣＭ４４０の丸棒、
切削速度：３００ｍ／ｍｉｎ．、
切り込み：４．５ｍｍ、
送り：０．２ｍｍ／ｒｅｖ．、
切削時間：５分、
の条件での合金鋼の乾式連続高速高切り込み切削加工試験、
被削材：ＪＩＳ・Ｓ２５Ｃの長さ方向等間隔４本縦溝入り丸棒、
切削速度：３５０ｍ／ｍｉｎ．、
切り込み：１．５ｍｍ、
送り：０．４ｍｍ／ｒｅｖ．、
切削時間：５分、
の条件での炭素鋼の乾式断続高速高送り切削加工試験、さらに、
被削材：ＪＩＳ・ＦＣ３００の丸棒、
切削速度：４００ｍ／ｍｉｎ．、
切り込み：５．０ｍｍ、
送り：０．３ｍｍ／ｒｅｖ．、
切削時間：５分、
の条件での鋳鉄の乾式連続高速高切り込み切削加工試験を行い、いずれの切削加工試験でも切刃の逃げ面摩耗幅を測定した。この測定結果を表７に示した。
【００１８】
【表１】
【表２】
【表３】
【表４】
【表５】
【表６】
【表７】
この結果得られた本発明被覆超硬チップ１〜１６および従来被覆超硬チップ１〜１６を構成する硬質被覆層について、厚さ方向に沿ってＡｌ、Ｔｉ、酸素、および窒素の含有量をオージェ分光分析装置を用いて測定し、この測定結果から各測定点におけるＡｌ／（Ａｌ＋Ｔｉ）および酸素／（酸素＋窒素）値、さらにＴｉ／（Ｔｉ＋Ａｌ）および窒素／（窒素＋酸素）値を算出したところ、本発明被覆超硬チップ１〜１６の硬質被覆層では、Ａｌおよび酸素の最高含有点と、Ｔｉおよび窒素の最高含有点とがそれぞれ目標値と実質的に同じ組成および間隔で交互に繰り返し存在し、かつＡｌおよび酸素の最高含有点からＴｉおよび窒素の最高含有点、前記Ｔｉおよび窒素の最高含有点からＡｌおよび酸素の最高含有点へＡｌとＴｉおよび酸素と窒素の含有量が連続的に変化する成分濃度分布構造を有することが確認され、硬質被覆層の平均層厚も目標全体層厚と実質的に同じ値を示した。また、従来被覆超硬チップ１〜１６の硬質被覆層においても目標層厚と実質的に同じ平均層厚のＡｌ2Ｏ3層とＴｉＮ層とが交互に、かつ目標全体層厚と実質的に同じ平均層厚で形成されていることが確認された。
【００２６】
【発明の効果】
表３〜７に示される結果から、硬質被覆層が層厚方向に、相対的にすぐれた高温硬さと耐熱性を有するＡｌおよび酸素の最高含有点と相対的に高強度を有するＴｉおよび窒素の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および酸素の最高含有点から前記Ｔｉおよび窒素の最高含有点、前記Ｔｉおよび窒素の最高含有点から前記Ａｌおよび酸素の最高含有点へＡｌとＴｉおよび酸素と窒素の含有量が連続的に変化する成分濃度分布構造を有する本発明被覆超硬チップ１〜１６は、いずれも各種の鋼や鋳鉄などの切削加工を、高速で、かつ高い熱的機械的衝撃を伴う高切り込みや高送りなどの重切削条件で行なった場合にも、硬質被覆層がすぐれた耐チッピング性および耐摩耗性を発揮するのに対して、硬質被覆層がＡｌ2Ｏ3層とＴｉＮ層の交互積層からなる従来被覆超硬チップ１〜１６においては、前記硬質被覆層のＡｌ2Ｏ3層が特に高速重切削条件ではチッピング発生の起点となり、また前記ＴｉＮ層の摩耗進行が切削時の高熱発熱により促進されることから、比較的短時間で使用寿命に至ることが明らかである。
上述のように、この発明の被覆超硬工具は、通常の条件での切削加工は勿論のこと、特に各種の鋼や鋳鉄などの切削加工を、高速で、かつ高い熱的機械的衝撃を伴う高切り込みや高送りなどの重切削条件で行なった場合にも、すぐれた耐チッピング性と耐摩耗性を発揮し、長期に亘ってすぐれた切削性能を示すものであるから、切削加工の省力化および省エネ化、さらに低コスト化に十分満足に対応できるものである。
【図面の簡単な説明】
【図１】被覆超硬工具を構成する硬質被覆層を形成するのに用いた化学蒸着装置を例示する概略縦断面図である。
【図２】化学蒸着装置の構造部材である超硬基体支持パレットを示し、（ａ）が概略斜視図、（ｂ）が概略平面図である。
【図３】この発明の被覆超硬工具を構成する硬質被覆層の形成に用いられる反応ガス組成自動制御システムである。[0001]
BACKGROUND OF THE INVENTION
In the present invention, the hard coating layer has high strength and is excellent in high-temperature hardness and heat resistance. Therefore, high-speed cutting such as various types of steel and cast iron is particularly suitable for high cutting and high cutting with high thermal mechanical impact. The present invention relates to a surface-coated cemented carbide cutting tool (hereinafter referred to as a coated carbide tool) that exhibits excellent chipping resistance and wear resistance even when performed under heavy cutting conditions such as feeding. .
[0002]
[Prior art]
In general, coated carbide tools are used for throwaway inserts that are detachably attached to the tip of a cutting tool for drilling and cutting of various materials such as steel and cast iron, and for flat cutting. There are drills, miniature drills, solid type end mills used for chamfering, grooving, shoulder processing, etc. Also, the throwaway tip is detachably attached and cutting is performed in the same way as the solid type end mill Throwaway end mill tools are known.
[0003]
Further, as a coated cemented carbide tool, for example, as described in JP-A-52-105396, tungsten carbide (hereinafter referred to as WC) based cemented carbide or titanium carbonitride (hereinafter referred to as TiCN) based cermet On the surface of a substrate composed of the following (hereinafter collectively referred to as a carbide substrate), an Al oxide (hereinafter referred to as Al 2 O 3 ) layer having an individual layer thickness of 1 μm or less and a Ti nitride (hereinafter referred to as a carbide substrate). Coated carbide tools formed by alternately laminating layers (denoted by TiN) and vapor-depositing with a total average layer thickness of 5 to 25 μm are proposed, and Al 2 O 3 —TiN alternating laminates constituting the hard coating layer are Because it has high-temperature hardness and heat resistance due to the Al 2 O 3 layer and strength due to the TiN layer, it is excellent when such coated carbide tools are used for continuous cutting and intermittent cutting of various steels and cast irons. Also known to demonstrate cutting performance To have.
[0004]
Furthermore, as shown in the schematic longitudinal sectional view of FIG. 1, for example, the coated carbide tool has a stainless steel reaction gas blowing pipe standing at the center thereof. A graphite cemented carbide substrate support pallet illustrated in a schematic perspective view in (a) and a schematic plan view in (b) is skewered and laminated, and these are heated by a heater through a stainless steel cover. A chemical vapor deposition apparatus having a structure is used, and the cemented carbide substrate is mounted on the chemical vapor deposition apparatus in a state where the carbide substrate is placed as illustrated in a number of reaction gas passage hole positions formed on the bottom surface of the carbide substrate support pallet. Then, after heating the inside of the apparatus to a predetermined temperature within a range of 800 to 1100 ° C. with a heater, for the formation of the Al 2 O 3 layer, the reaction gas is in volume% (hereinafter,% of reaction gas is Capacity%),
AlCl 3 : 2 to 7%,
CO 2 : 2 to 10%
HCl: 3-7%
H 2 : Remaining
For forming a TiN layer, a reaction gas having a composition consisting of:
TiCl 4: 1~3%,
N 2 : 40-60%
H 2 : Remaining
The reaction gas pressure in the apparatus is maintained at a predetermined pressure within a range of 7 to 40 kPa through the reaction gas blowing pipe into the apparatus that has been evacuated in advance. However, it is also known that it is produced by forming a hard coating layer composed of Al 2 O 3 —TiN alternating layers by introducing them alternately.
[0005]
[Problems to be solved by the invention]
In recent years, there has been a remarkable increase in the performance of cutting equipment, while there has been a strong demand for labor saving and energy saving and further cost reduction for cutting work. Although there is a tendency to be forced to perform cutting under heavy cutting conditions such as high feed, the above-mentioned conventional coated carbide tools are used for heavy cutting such as high cutting and high feed with high thermal mechanical impact. When used for high-speed operation, the Al 2 O 3 layer, which is a hard coating layer composed of Al 2 O 3 -TiN alternating layers, has excellent high-temperature hardness and heat resistance, but has insufficient strength. In heavy cutting, this becomes the starting point of fracture, causing chipping (microcracking). Similarly, the TiN layer has high strength but low high temperature hardness and low heat resistance. Now wear progress in heavy cutting is rapidly promoted, to reach this result relatively short time service life at present.
[0006]
[Means for Solving the Problems]
In view of the above, the present inventors conducted research in order to develop a coated carbide tool that exhibits excellent chipping resistance and wear resistance with a hard coating layer particularly excellent in high speed heavy cutting. result,
(A) Using the chemical vapor deposition apparatus shown in FIGS. 1 and 2 above, a composite compound of Al 2 O 3 and TiN, which is a constituent component of the hard coating layer of the conventional coated carbide tool, that is, Al and Ti When forming a composite nitride oxide (hereinafter referred to as Al-Ti nitride oxide) layer, for example, as shown in a schematic chart of a reaction gas composition automatic control system in FIG. For the purpose of alternately and repeatedly forming the highest content point of Al and oxygen and the highest content point of Ti and nitrogen along the layer thickness direction in the hard coating layer composed of the Al-Ti nitride oxide layer, A reaction gas composition corresponding to the highest content point of Al and oxygen and the highest content point of Ti and nitrogen, and a reaction gas composition corresponding to continuous change of Al and oxygen and Ti and nitrogen between the two points; Wherein the distance between two points, and inputs based on historical data, according to a control signal from the reaction gas composition and flow rates central controller, H 2 gas from the raw material gas cylinder, CO 2 gas, N 2 gas, And the flow rate of HCl gas, and further, the flow rate of AlCl 3 gas and TiCl 4 gas are controlled by the respective raw material gas flow rate automatic control devices, and introduced into the reaction gas blowing pipe of the chemical vapor deposition device, along the layer thickness direction, The highest content point of Al and oxygen and the highest content point of Ti and nitrogen are alternately present at predetermined intervals, and from the highest content point of Al and oxygen, the highest content point of Ti and nitrogen, Ti and A component concentration distribution structure in which the content of Al, oxygen and Ti and nitrogen continuously changes from the highest content point of nitrogen to the highest content point of Al and oxygen. To become that as hard coating layer consisting of ivy Al-Ti nitric oxide layer is formed.
[0007]
(B) In the Al-Ti nitride oxide layer having the repeated continuous change component concentration distribution structure of (a) above,
Al / (Al + Ti) and oxygen / (oxygen + nitrogen) indicating the mutual content ratio of Al and Ti and oxygen and nitrogen at the highest content point of Al and oxygen, respectively, in atomic ratios,
Al / (Al + Ti): 0.80 to 0.98,
Oxygen / (oxygen + nitrogen): 0.80 to 0.98,
Ti / (Ti + Al) and nitrogen / (nitrogen + oxygen) indicating the mutual content ratio of Ti and Al and nitrogen and oxygen at the highest content point of Ti and nitrogen, respectively, in atomic ratios,
Ti / (Ti + Al): 0.80 to 0.98,
Nitrogen / (nitrogen + oxygen): 0.80 to 0.98,
And the distance in the thickness direction between the highest content point of Al and oxygen adjacent to each other and the highest content point of Ti and nitrogen is 0.01 to 0.2 μm,
The highest content point of Al and oxygen shows excellent high temperature hardness and heat resistance corresponding to the high temperature hardness and heat resistance of Al 2 O 3 , while the highest content point of Ti and nitrogen has TiN. High strength corresponding to the strength is ensured, and the interval between the highest content point of Al and oxygen and the highest content point of Ti and nitrogen is extremely small. In addition, since the contents of Al and oxygen and Ti and nitrogen continuously change (component concentration distribution structure) between the two points, there is no origin of destruction. Therefore, coated carbide tools composed of an Al-Ti nitride oxide layer with a hard coating layer are particularly suitable for cutting various steels and cast irons at high speed and with high thermal mechanical impact. Even when conducted in heavy cutting conditions such as high cut and high feed with, be chipping resistance of the hard coating layer has excellent and as to exhibit wear resistance.
The research results shown in (a) and (b) above were obtained.
[0008]
The present invention has been made based on the above research results, and a hard coating layer composed of an Al-Ti nitride oxide layer is deposited on the surface of a cemented carbide substrate with an overall average layer thickness of 5 to 25 μm. In the coated carbide tool
In the hard coating layer, the highest content point of Al and oxygen and the highest content point of Ti and nitrogen are alternately present at predetermined intervals along the layer thickness direction, and the highest content point of Al and oxygen Has a component concentration distribution structure in which the contents of Al, Ti, nitrogen and oxygen continuously change from the highest Ti and nitrogen content point to the highest Al and oxygen content point. And
Further, Al / (Al + Ti) and oxygen / (oxygen + nitrogen) indicating the mutual content ratio of Al and Ti and oxygen and nitrogen at the highest content point of Al and oxygen are respectively in atomic ratios.
Al / (Al + Ti): 0.80 to 0.98,
Oxygen / (oxygen + nitrogen): 0.80 to 0.98,
Ti / (Ti + Al) and nitrogen / (nitrogen + oxygen) indicating the mutual content ratio of Ti and Al and nitrogen and oxygen at the highest content point of Ti and nitrogen are atomic ratios, respectively.
Ti / (Ti + Al): 0.80 to 0.98,
Nitrogen / (nitrogen + oxygen): 0.80 to 0.98,
The distance between the highest content point of Al and oxygen adjacent to each other and the highest content point of Ti and nitrogen is 0.01 to 0.2 μm.
This is characterized by a coated carbide tool that exhibits excellent chipping resistance and wear resistance under high-speed heavy cutting conditions.
[0009]
Next, in the coated carbide tool of the present invention, the reason why the structure of the hard coating layer constituting the tool is limited as described above will be described.
(A) Maximum content point of Al and oxygen The Ti and nitrogen components of the Al-Ti oxynitride layer have the effect of improving the strength, and the Al and oxygen components have the effect of improving the high temperature hardness and heat resistance. At the highest content point of Al and oxygen, the content ratio of Al and oxygen is relatively increased to improve high-temperature hardness and heat resistance, so that it is suitable for high-speed cutting with high heat generation. Al / (Al + Ti) and oxygen / (oxygen + nitrogen) indicating the mutual content ratio of Ti and Ti and oxygen and nitrogen exceed 0.98 in atomic ratio (hereinafter the same), and are substantially Al oxides. Since the highest content point of Ti and nitrogen having high strength exists adjacent to each other, the strength of the layer itself is inevitably lowered, and as a result, chipping is likely to occur. When the value is less than 0.80, the high-temperature hardness and heat resistance are drastically reduced, which causes accelerated wear. Therefore, the values of Al / (Al + Ti) and oxygen / (oxygen + nitrogen) are both 0.80. It was set to ˜0.98.
[0010]
(B) The highest content point of Ti and nitrogen As mentioned above, the highest content point of Al and oxygen has relatively good high temperature hardness and heat resistance, but on the other hand, the strength is relatively insufficient. In order to make up for the lack of strength at the highest content point of oxygen and oxygen, the highest content points of Ti and nitrogen having high strength are alternately interposed in the thickness direction. However, when Ti / (Ti + Al) and nitrogen / (nitrogen + oxygen), which indicate the mutual content ratio of Ti and Al and nitrogen and oxygen, exceed 0.98, respectively, it is substantially composed of Ti nitride. Therefore, the predetermined high-temperature hardness and heat resistance cannot be ensured at the highest content point of Ti and nitrogen, which causes the acceleration of wear, while if the same value is less than 0.80, the desired excellent strength As a result, chipping is likely to occur. Therefore, the values of Ti / (Ti + Al) and nitrogen / (nitrogen + oxygen) were both set to 0.80 to 0.98.
[0011]
(C) Interval between highest content point of Al and oxygen and highest content point of Ti and nitrogen If the distance is less than 0.01 μm, it is difficult to form each point clearly with the above composition. In addition, it is impossible to ensure the desired excellent high-temperature hardness and heat resistance and further high strength, and if the distance exceeds 0.2 μm, each point has a defect, that is, the highest content point of Al and oxygen. Insufficient strength, if it is the highest content point of Ti and nitrogen, high-temperature hardness and insufficient heat resistance will appear locally in the layer, which makes it easier for chipping to occur and promotes the progress of wear Therefore, the interval was determined to be 0.01 to 0.2 μm.
[0012]
(D) Overall average layer thickness of hard coating layer If the layer thickness is less than 5 μm, the desired wear resistance cannot be ensured. On the other hand, if the average layer thickness exceeds 25 μm, chipping tends to occur. Therefore, the average layer thickness was determined to be 5 to 25 μm.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, the coated carbide tool of the present invention will be specifically described with reference to examples.
Example 1
As raw material powders, WC powder, TiC powder, VC powder, TaC powder, NbC powder, Cr 3 C 2 powder, and Co powder, all having an average particle diameter of 1 to 3 μm, were prepared. And then wet-mixed with a ball mill for 72 hours, dried, and press-molded into a green compact at a pressure of 100 MPa. The green compact was vacuumed at 6 Pa at a temperature of 1400 ° C. for 1 hour. Sintered under the holding conditions, and after sintering, the cutting edge portion was subjected to a honing process of R: 0.03, and the carbide bases A1 to A10 made of WC-based cemented carbide having a chip shape of ISO standard CNMG160608 Formed.
[0014]
In addition, as raw material powders, all are TiCN (weight ratio TiC / TiN = 50/50) powder, Mo 2 C powder, ZrC powder, NbC powder, TaC powder, WC powder having an average particle diameter of 0.5 to 2 μm. Co powder and Ni powder are prepared, and these raw material powders are blended in the blending composition shown in Table 2, wet mixed by a ball mill for 24 hours, dried, and then pressed into a compact at a pressure of 100 MPa. The green compact was sintered in a 2 kPa nitrogen atmosphere at a temperature of 1500 ° C. for 1 hour. After sintering, the cutting edge portion was subjected to a honing process of R: 0.03, and ISO standard / CNMG160612. TiCN-based cermet carbide substrates B1 to B6 having the following chip shape were formed.
[0015]
Next, each of the above-mentioned carbide substrates A1 to A10 and B1 to B6 is ultrasonically cleaned in acetone and dried, and then the carbide shown in FIG. 2 is placed in the chemical vapor deposition apparatus shown in FIG. First, when the inside of the apparatus was heated to 900 ° C. with a heater, it was loaded with TiCl 4 : 4.2%, N 2 : 30%, H 2 : remaining. A reactive gas having a composition is introduced through a reactive gas blowing tube, the reaction atmosphere pressure in the apparatus is set to 30 kPa, and this state is maintained for 30 minutes, and the titanium nitride having an average layer thickness of 0.3 μm as a base adhesion layer ( TiN) layer is formed, and the atmospheric temperature in the apparatus is then heated to 1020 ° C. with a heater, and then the reaction gas composition and flow rate central control apparatus of the reaction gas composition automatic control system shown in FIG. According to the data of the past results, the target Al / (Al + Ti) and oxygen / (oxygen + nitrogen) of the highest content point of Al and oxygen shown in Table 3 and the target Ti / (Ti + Al of the highest content point of Ti and nitrogen are shown. ) And nitrogen / (nitrogen + oxygen), corresponding to the continuous change in the content of Al, Ti, and oxygen and nitrogen between the highest content point of Al and oxygen and the highest content point of Ti and nitrogen A control valve that operates in accordance with the reaction gas composition and the signal from the central controller of the flow rate by inputting the target gas distance between the two points shown in Tables 4 and 5 and the target total thickness of the hard coating layer. Through the built-in raw material gas flow rate automatic control device, H 2 gas, N 2 gas, CO 2 gas, and HCl gas, which are raw material gases, and AlCl 3 gas and TiCl 4 gas (in this case, AlCl 3 gas is formed by reacting metal Al with HCl gas whose flow rate is controlled by an AlCl 3 gas generator, and TiCl 4 gas is H 2 having its flow rate controlled as shown in the figure. 2 gas is sent to the TiCl 4 gas generator as a carrier gas, where it is sent to the raw material gas flow automatic control device together with the TiCl 4 gas vaporized from the liquid) while controlling the respective gas flow rates. The reaction gas was introduced into the apparatus from the reaction gas blowing pipe of the vapor deposition apparatus (the reaction atmosphere pressure in the apparatus is always maintained at 7 kPa), so that the surface of the carbide substrate is shown in Tables 3 and 4 along the layer thickness direction. Target Al / (Al + Ti) and oxygen / (oxygen + nitrogen) Al and oxygen highest content points and target Ti / (Ti + Al) and nitrogen / (nitrogen + oxygen) Ti and The highest content point of element is alternately present repeatedly at the target intervals shown in Tables 3 and 4, and the highest content point of Ti and nitrogen from the highest content point of Al and oxygen, and the highest content of Ti and nitrogen From the point to the highest content point of Al and oxygen, the content of Al, Ti and oxygen and nitrogen has a component concentration distribution structure that continuously changes, and the target total layer thickness shown in Tables 3 and 4 By depositing a hard coating layer, throwaway tips made of the surface-coated cemented carbide of the present invention (hereinafter referred to as the present coated carbide tips) 1 to 16 as the coated carbide tools of the present invention were produced.
[0016]
For comparison purposes, these carbide substrates A1 to A10 and B1 to B6 were ultrasonically cleaned in acetone and dried, and then charged into the normal chemical vapor deposition apparatus shown in FIGS. The conditions for forming the Al 2 O 3 layer are as follows:
Reaction gas composition: AlCl 3 : 3%, CO 2 : 7%, HCl: 3%, H 2 : remaining,
Reaction atmosphere temperature: 1000 ° C.
Reaction atmosphere pressure: 7 kPa,
And the formation conditions of the TiN layer are as follows:
Reaction gas composition: TiCl 4 : 2%, N 2 : 55%, H 2 : remaining,
Reaction atmosphere temperature: 1000 ° C.
Reaction atmosphere pressure: 13 kPa,
As shown in Tables 6 and 7, hard coating layers composed of alternately laminated Al 2 O 3 layers and TiN layers having the target layer thicknesses are respectively applied to the surfaces of the superhard substrates A1 to A10 and B1 to B6. By depositing at the target total layer thickness shown in Tables 6 and 7, conventional surface-coated cemented carbide throwaway tips (hereinafter referred to as conventional coated carbide tips) 1 to 16 as conventional coated carbide tools, respectively. Manufactured.
[0017]
Next, with the present invention coated carbide tips 1-16 and conventional coated carbide tips 1-16, in a state where this is screwed to the tip of the tool steel tool with a fixing jig,
Work material: JIS / SCM440 round bar,
Cutting speed: 300 m / min. ,
Cutting depth: 4.5mm,
Feed: 0.2 mm / rev. ,
Cutting time: 5 minutes
Dry-type continuous high-speed high-cut cutting test of alloy steel under the conditions of
Work material: JIS-S25C round bar with four equal grooves in the longitudinal direction,
Cutting speed: 350 m / min. ,
Incision: 1.5mm,
Feed: 0.4 mm / rev. ,
Cutting time: 5 minutes
Dry intermittent high-speed high-feed cutting test of carbon steel under the conditions of
Work material: JIS / FC300 round bar,
Cutting speed: 400 m / min. ,
Cutting depth: 5.0mm,
Feed: 0.3 mm / rev. ,
Cutting time: 5 minutes
The dry continuous high-speed, high-cut cutting test of cast iron was performed under the conditions described above, and the flank wear width of the cutting edge was measured in any cutting test. The measurement results are shown in Table 7.
[0018]
[Table 1]
[Table 2]
[Table 3]
[Table 4]
[Table 5]
[Table 6]
[Table 7]
For the hard coating layers constituting the coated carbide chips 1 to 16 of the present invention and the conventional coated carbide chips 1 to 16 obtained as a result, the contents of Al, Ti, oxygen, and nitrogen in the thickness direction were Auger. Measurement was performed using a spectroscopic analyzer, and Al / (Al + Ti) and oxygen / (oxygen + nitrogen) values at each measurement point, and further Ti / (Ti + Al) and nitrogen / (nitrogen + oxygen) values were calculated from the measurement results. However, in the hard coating layers of the coated carbide chips 1 to 16 of the present invention, the highest content point of Al and oxygen and the highest content point of Ti and nitrogen are alternately repeated at substantially the same composition and interval as the target values, respectively. Al, Ti and oxygen from the highest content point of Al and oxygen to the highest content point of Ti and nitrogen, from the highest content point of Ti and nitrogen to the highest content point of Al and oxygen It is confirmed that the content of nitrogen has a continuously changing component concentration distribution structure, the average layer thickness of the hard layer showed a target total layer thickness substantially the same value. Also, in the hard coating layers of the conventional coated carbide chips 1 to 16, Al 2 O 3 layers and TiN layers having an average layer thickness substantially the same as the target layer thickness are alternately arranged and substantially the target total layer thickness. It was confirmed that they were formed with the same average layer thickness.
[0026]
【The invention's effect】
From the results shown in Tables 3 to 7, the hard coating layer is composed of Ti and nitrogen having relatively high strength and the highest content point of Al and oxygen having relatively high temperature hardness and heat resistance in the layer thickness direction. The highest content point is alternately present at predetermined intervals, and the highest content point of Ti and nitrogen from the highest content point of Al and oxygen, and the highest content of Al and oxygen from the highest content point of Ti and nitrogen. The coated carbide chips 1 to 16 of the present invention having a component concentration distribution structure in which the contents of Al and Ti and oxygen and nitrogen continuously change to the content point are all high-speed cutting processes such as various steels and cast iron. In addition, the hard coating layer exhibits excellent chipping resistance and wear resistance even when performed under heavy cutting conditions such as high cutting and high feed with high thermal mechanical impact. Coating layer In the conventional coated cemented carbide chips 1-16 of alternating lamination of l 2 O 3 layer and TiN layer, Al 2 O 3 layer of the hard coating layer becomes a starting point of chipping, especially in high-speed heavy cutting conditions and the TiN It is clear that the wear life of the layer is accelerated by high heat generation during cutting, so that the service life is reached in a relatively short time.
As described above, the coated cemented carbide tool of the present invention is not only for cutting under normal conditions, but particularly for cutting of various steels and cast irons at high speed and with high thermal mechanical impact. Even under heavy cutting conditions such as high depth of cut and high feed, it exhibits excellent chipping resistance and wear resistance, and exhibits excellent cutting performance over a long period of time. And it can cope with energy saving and cost reduction sufficiently satisfactorily.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view illustrating a chemical vapor deposition apparatus used for forming a hard coating layer constituting a coated carbide tool.
2A and 2B show a cemented carbide substrate support pallet that is a structural member of a chemical vapor deposition apparatus, in which FIG. 2A is a schematic perspective view, and FIG. 2B is a schematic plan view.
FIG. 3 is a reaction gas composition automatic control system used for forming a hard coating layer constituting the coated carbide tool of the present invention.
Claims (1)
上記硬質被覆層が、層厚方向にそって、Ａｌおよび酸素の最高含有点とＴｉおよび窒素の最高含有点とが所定間隔をおいて交互に繰り返し存在し、かつ前記Ａｌおよび酸素の最高含有点から前記Ｔｉおよび窒素の最高含有点、前記Ｔｉおよび窒素の最高含有点から前記Ａｌおよび酸素の最高含有点へＡｌとＴｉおよび窒素と酸素の含有量が連続的に変化する成分濃度分布構造を有し、
さらに、上記Ａｌおよび酸素の最高含有点におけるＡｌとＴｉおよび酸素と窒素の相互含有割合を示すＡｌ／（Ａｌ＋Ｔｉ）および酸素／（酸素＋窒素）が、それぞれ原子比で、
Ａｌ／（Ａｌ＋Ｔｉ）：０．８０〜０．９８、
酸素／（酸素＋窒素）：０．８０〜０．９８、
上記Ｔｉおよび窒素の最高含有点におけるＴｉとＡｌおよび窒素と酸素の相互含有割合を示すＴｉ／（Ｔｉ＋Ａｌ）および窒素／（窒素＋酸素）が、それぞれ原子比で、
Ｔｉ／（Ｔｉ＋Ａｌ）：０．８０〜０．９８、
窒素／（窒素＋酸素）：０．８０〜０．９８、
を満足し、かつ隣り合う上記Ａｌおよび酸素の最高含有点と上記Ｔｉおよび窒素の最高含有点の間隔が、０．０１〜０．２μmであること、
を特徴とする高速重切削条件で硬質被覆層がすぐれた耐チッピング性および耐摩耗性を発揮する表面被覆超硬合金製切削工具。Surface-coated carbide formed by vapor-depositing a hard coating layer composed of a composite nitrogen oxide layer of Al and Ti on the surface of a tungsten carbide base cemented carbide substrate or a titanium carbonitride-based cermet substrate with an overall average layer thickness of 5 to 25 μm In alloy cutting tools,
In the hard coating layer, the highest content point of Al and oxygen and the highest content point of Ti and nitrogen are alternately present at predetermined intervals along the layer thickness direction, and the highest content point of Al and oxygen Has a component concentration distribution structure in which the contents of Al, Ti, nitrogen and oxygen continuously change from the highest Ti and nitrogen content point to the highest Al and oxygen content point. And
Further, Al / (Al + Ti) and oxygen / (oxygen + nitrogen) indicating the mutual content ratio of Al and Ti and oxygen and nitrogen at the highest content point of Al and oxygen are respectively in atomic ratios.
Al / (Al + Ti): 0.80 to 0.98,
Oxygen / (oxygen + nitrogen): 0.80 to 0.98,
Ti / (Ti + Al) and nitrogen / (nitrogen + oxygen) indicating the mutual content ratio of Ti and Al and nitrogen and oxygen at the highest content point of Ti and nitrogen are atomic ratios, respectively.
Ti / (Ti + Al): 0.80 to 0.98,
Nitrogen / (nitrogen + oxygen): 0.80 to 0.98,
And the interval between the highest content point of Al and oxygen adjacent to each other and the highest content point of Ti and nitrogen is 0.01 to 0.2 μm,
A surface-coated cemented carbide cutting tool that exhibits excellent chipping resistance and wear resistance under high-speed heavy cutting conditions.
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