JP2007130741A - Surface coated cemented carbide cutting tool having hard coating layer exhibiting superior chipping resistance in heavy cutting for material hard to cut - Google Patents
Surface coated cemented carbide cutting tool having hard coating layer exhibiting superior chipping resistance in heavy cutting for material hard to cut Download PDFInfo
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この発明は、硬質被覆層がすぐれた高温硬さ・耐熱性・高温強度を備えるとともに、すぐれた潤滑性を示し、したがって、特に軟鋼、クロム鋼などの粘性の高い難削材を、高い発熱を伴う高送り、高切り込みの重切削条件で切削加工を行なった場合にも、切削時に切粉が切刃部に溶着することなく、すぐれた耐チッピング性を発揮する、炭化タングステン基超硬合金または炭窒化チタン基サーメットで構成された基体の表面に、化学蒸着により硬質被覆層を形成してなる表面被覆超硬切削工具（以下、被覆超硬工具という）に関するものである。 The present invention provides a hard coating layer with excellent high temperature hardness, heat resistance, and high temperature strength, and excellent lubricity. Therefore, particularly difficult-to-cut materials with high viscosity, such as mild steel and chrome steel, can generate high heat. Tungsten carbide-based cemented carbide that exhibits excellent chipping resistance without cutting chips adhering to the cutting edge during cutting even under heavy feed conditions with high feed and high cutting. The present invention relates to a surface-coated carbide cutting tool (hereinafter referred to as a coated carbide tool) formed by forming a hard coating layer on a surface of a substrate composed of a titanium carbonitride-based cermet by chemical vapor deposition.
被覆超硬工具として、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、
（ａ）いずれも化学蒸着形成されたＴｉの炭化物（以下、ＴｉＣで示す）層、窒化物（以下、同じくＴｉＮで示す）層、炭窒化物（以下、ＴｉＣＮで示す）層、炭酸化物（以下、ＴｉＣＯで示す）層、および炭窒酸化物（以下、ＴｉＣＮＯで示す）層のうちの１層または２層以上からなり、かつ０．５〜１５μｍの全体平均層厚を有するＴｉ化合物層からなる下部層、
（ｂ）化学蒸着で形成された、０．５〜１３μｍの平均層厚を有し、ＡｌとＣｒの相互含有割合を示す組成式：（Ａｌ１−ＸＣｒＸ）（ただし、原子比で、Ｘは０．０５〜０．３５を示す）を満足するＡｌとＣｒの複合酸化物［以下、（Ａｌ，Ｃｒ）２Ｏ３で示す］層からなる上部層、
上記の下部層と上部層で構成された硬質被覆層を形成してなる、被覆超硬工具が知られている。
As a coated carbide tool, a substrate made of tungsten carbide (hereinafter referred to as WC) -based cemented carbide or titanium carbonitride (hereinafter referred to as TiCN) -based cermet (hereinafter collectively referred to as a cemented carbide substrate). On the surface,
(A) All of these are Ti carbide (hereinafter referred to as TiC) layer, nitride (hereinafter also referred to as TiN) layer, carbonitride (hereinafter referred to as TiCN) layer, carbon oxide (hereinafter referred to as TiC) formed by chemical vapor deposition. And a Ti compound layer having an overall average layer thickness of 0.5 to 15 μm. Lower layer,
(B) Composition formula formed by chemical vapor deposition and having an average layer thickness of 0.5 to 13 μm and showing a mutual content ratio of Al and Cr: (Al 1-X Cr X ) (however, in atomic ratio, X represents 0.05 to 0.35) and an upper layer composed of a composite oxide of Al and Cr [hereinafter referred to as (Al, Cr) 2 O 3 ] layer;
A coated cemented carbide tool formed by forming a hard coating layer composed of the above lower layer and upper layer is known.
また、上記の従来被覆超硬工具の硬質被覆層を構成する上部層である（Ａｌ，Ｃｒ）２Ｏ３層が、Ａｌによる高温硬さおよび耐熱性と、Ｃｒによる高温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。 In addition, the (Al, Cr) 2 O 3 layer, which is the upper layer constituting the hard coating layer of the conventional coated carbide tool, has high-temperature hardness and heat resistance due to Al, and high-temperature strength due to Cr. It is also known that such coated carbide tools exhibit excellent cutting performance when used for cutting various types of steel and cast iron.
さらに、上記の従来被覆超硬工具が、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８５０〜１０５０℃の範囲内の所定の温度に加熱した後、まず、硬質被覆層の下部層として、例えば表３に示される形成条件でＴｉ化合物層を形成し、ついで、 （ａ）反応ガス組成：容量％で（以下、反応ガスの％は容量％を示す）、
ＡｌＣｌ３： １．４３〜２．０９ ％、
ＣｒＣｌ２： ０．１１〜０．７７ ％、
ＣＯ２： ５〜６ ％、
ＨＣｌ： ２〜３ ％、
Ｈ２：残り、
（ｂ）反応雰囲気温度： ９８０〜１０５０ ℃、
（ｃ）反応雰囲気圧力： １０〜２０ ｋＰａ、
の条件で、上記の（Ａｌ，Ｃｒ）２Ｏ３層からなる上部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。
Further, in the above conventional coated carbide tool, for example, as shown in a schematic longitudinal sectional view in FIG. 1, a reaction gas blowing pipe made of stainless steel is erected at the center portion. (A) is a schematic perspective view, and (b) is a schematic plan view illustrating a carbide substrate support pallet made of graphite that is skewered and laminated, and these are heated by a heater through a stainless steel cover. The chemical vapor deposition apparatus having the structure described above is used, and the cemented carbide substrate is placed on the chemical vapor deposition apparatus in a state where the carbide substrate is placed as illustrated in a plurality of reaction gas passage hole positions formed on the bottom surface of the carbide substrate support pallet. After charging and heating the inside of the apparatus with a heater to a predetermined temperature within a range of 850 to 1050 ° C., for example, a Ti compound layer is first formed as a lower layer of the hard coating layer under the formation conditions shown in Table 3, for example. Forming, then (a) Reaction gas composition: In volume% (hereinafter,% of reaction gas indicates volume%)
AlCl 3 : 1.43 to 2.09%,
CrCl 2: 0.11~0.77%,
CO 2: 5~6%,
HCl: 2-3%,
H 2 : Remaining
(B) Reaction atmosphere temperature: 980-1050 ° C.,
(C) Reaction atmosphere pressure: 10 to 20 kPa,
It is also known that it is manufactured by forming an upper layer made of the above (Al, Cr) 2 O 3 layer under the above conditions.
また、一般に、上記の従来被覆超硬工具の硬質被覆層を構成するＴｉ化合物層や（Ａｌ，Ｃｒ）２Ｏ３層が粒状結晶組織を有し、さらに、前記Ｔｉ化合物層を構成するＴｉＣＮ層を、層自身の強度向上を目的として、通常の化学蒸着装置にて、反応ガスとしてＣＨ３ＣＮなどの有機炭窒化物を含む混合ガスを使用し、７００〜９５０℃の中温温度域で化学蒸着することにより形成して縦長成長結晶組織をもつようにすることも知られている。
近年の切削加工装置のＦＡ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、通常の切削条件に加えて、高い切削加工効率が得られるが、その反面、切刃部への機械的負荷が大きなものとなる高切り込みや高送りなどの重切削条件での切削加工が要求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、各種の鋼や鋳鉄を通常条件下で切削加工した場合に特段の問題は生じないが、これを特に軟鋼、クロム鋼などの粘性の高い難削材の、高い発熱を伴う高送り、高切り込みの重切削条件下で切削加工を行った場合には、特に硬質被覆層の上部層を構成する（Ａｌ，Ｃｒ）２Ｏ３層の潤滑性、表面滑り性不足が原因となって、切削時に切粉が切刃部に溶着し、これが原因でチッピング（微少欠け）が発生しやすくなり、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。 In recent years, the use of FA for cutting devices has been remarkable. On the other hand, there are strong demands for labor saving, energy saving, and cost reduction for cutting processing. Accordingly, in addition to normal cutting conditions, cutting processing requires high cutting processing. Although efficiency can be obtained, on the other hand, there is a tendency to require cutting under heavy cutting conditions such as high cutting and high feed that increase the mechanical load on the cutting edge. In hard tools, there is no particular problem when various types of steel and cast iron are machined under normal conditions. This is especially true for high viscosity difficult-to-cut materials such as mild steel and chrome steel. When cutting is performed under feed and high cutting conditions, especially due to the lack of lubricity and surface slipperiness of the (Al, Cr) 2 O 3 layer that forms the upper layer of the hard coating layer. When cutting, chips are welded to the cutting edge, Les is chipping (minute chipping) is likely to occur due to reach this result relatively short time service life at present.
そこで、本発明者等は、上述のような観点から、特に軟鋼、クロム鋼などの粘性の高い難削材の高送り、高切り込みの重切削加工でも、硬質被覆層がすぐれた耐チッピング性を発揮する被覆超硬工具を開発すべく、上記従来の被覆超硬工具を構成する硬質被覆層に着目し、研究を行った結果、
（１）下部層がＴｉ化合物層、上部層が（Ａｌ，Ｃｒ）２Ｏ３層からなる上記従来の硬質被覆層上に、例えば、
（ａ）反応ガス組成（容量％）：
ＳｉＣｌ４： １．８ ％、
ＣＯ２： ６．０ ％、
ＨＣｌ： ５ ％、
Ｈ２： 残り、
（ｂ）反応雰囲気温度：１０００ ℃、
（ｃ）反応雰囲気圧力： ７ ｋＰａ、
の条件で化学蒸着を行い、従来の硬質被覆層上に、０．１〜０．８μｍの平均層厚を有するシリコン酸化物（以下、ＳｉＯ２で示す）層の薄層を形成すると、該化学蒸着により形成された薄層のＳｉＯ２層は非常にすぐれた潤滑性、表面滑り性を有すること。
（２）上記（１）で蒸着形成した平均層厚０．１〜０．８μｍの薄層のＳｉＯ２層（以下、「薄層Ａ」という）の上に、従来の硬質被覆層の上部層を構成する層である（Ａｌ，Ｃｒ）２Ｏ３層を、
例えば、
（ａ）反応ガス組成（容量％）：
ＡｌＣｌ３： １．８ ％、
ＣｒＣｌ２： ０．５ ％、
ＣＯ２： ５．５ ％、
ＨＣｌ： ２．２ ％、
Ｈ２： 残り、
（ｂ）反応雰囲気温度： １０００ ℃、
（ｃ）反応雰囲気圧力： １０ ｋＰａ、
の条件で化学蒸着し、０．１〜０．６μｍの平均層厚を有する（Ａｌ，Ｃｒ）２Ｏ３層の薄層（以下、「薄層Ｂ」という）を形成し、さらに、この（Ａｌ，Ｃｒ）２Ｏ３層からなる薄層Ｂと、前記（１）の条件で蒸着形成したＳｉＯ２層からなる薄層Ａとを、交互に繰り返し積層して、その合計平均層厚が２〜１０μｍとなるように薄層Ａと薄層Ｂとの交互積層構造からなる交互多重積層を形成すると、該交互多重積層は、（Ａｌ，Ｃｒ）２Ｏ３層からなる薄層Ｂの有するすぐれた高温硬さ、耐熱性、高温強度を備えると同時に、薄膜Ａの有するすぐれた潤滑性、表面滑り性をも具備するようになること、
（３）前記交互多重積層は、薄層Ｂの有するすぐれた高温硬さ、耐熱性、高温強度を損なうことなく、薄層Ａの有するすぐれた潤滑性、表面滑り性をも備えることから、軟鋼、クロム鋼等の難削材の重切削加工においても、前記交互多重積層のすぐれた潤滑性、表面滑り性によって切刃部への切粉の溶着が低減され、チッピングの発生を防止できること。
以上（１）〜（３）に示される研究結果を得たのである。
In view of the above, the inventors of the present invention have excellent chipping resistance with a hard coating layer, especially in high-feed and high-cut heavy cutting of highly viscous difficult-to-cut materials such as mild steel and chrome steel. As a result of conducting research, focusing on the hard coating layer that constitutes the above conventional coated carbide tools,
(1) On the above conventional hard coating layer in which the lower layer is a Ti compound layer and the upper layer is an (Al, Cr) 2 O 3 layer, for example,
(A) Reaction gas composition (volume%):
SiCl 4 : 1.8%,
CO 2 : 6.0%,
HCl: 5%,
H 2 : remaining,
(B) Reaction atmosphere temperature: 1000 ° C.
(C) Reaction atmosphere pressure: 7 kPa,
When a chemical vapor deposition is performed to form a thin layer of a silicon oxide layer (hereinafter referred to as SiO 2 ) having an average layer thickness of 0.1 to 0.8 μm on a conventional hard coating layer, the chemical The thin SiO 2 layer formed by vapor deposition has excellent lubricity and surface slipperiness.
(2) The upper layer of the conventional hard coating layer on the thin SiO 2 layer (hereinafter referred to as “thin layer A”) having an average layer thickness of 0.1 to 0.8 μm formed by vapor deposition in (1) above. (Al, Cr) 2 O 3 layer which is a layer constituting
For example,
(A) Reaction gas composition (volume%):
AlCl 3 : 1.8%,
CrCl 2 : 0.5%,
CO 2 : 5.5%,
HCl: 2.2%,
H 2 : remaining,
(B) Reaction atmosphere temperature: 1000 ° C.,
(C) Reaction atmosphere pressure: 10 kPa,
Chemical vapor deposition was performed to form a thin (Al, Cr) 2 O 3 layer (hereinafter referred to as “thin layer B”) having an average layer thickness of 0.1 to 0.6 μm. The thin layer B composed of the Al, Cr) 2 O 3 layer and the thin layer A composed of the SiO 2 layer formed by vapor deposition under the condition (1) are alternately and repeatedly stacked, and the total average layer thickness is 2 When an alternate multilayer stack composed of an alternate multilayer structure of thin layers A and B is formed so as to have a thickness of 10 μm, the alternate multilayer stack is excellent in the thin layer B composed of (Al, Cr) 2 O 3 layers. High temperature hardness, heat resistance, high temperature strength, as well as excellent lubricity and surface slipperiness of the thin film A,
(3) Since the above-mentioned alternate multi-layer has the excellent high-temperature hardness, heat resistance, and high-temperature strength possessed by the thin layer B, it also has the excellent lubricity and surface slipperiness possessed by the thin layer A. Even in heavy cutting of difficult-to-cut materials such as chrome steel, chip adhesion to the cutting edge portion can be reduced by the excellent lubricity and surface slipperiness of the alternating multiple lamination, and chipping can be prevented.
The research results shown in (1) to (3) above were obtained.
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、基体の表面に、硬質被覆層を形成してなる被覆超硬工具（表面被覆超硬切削工具）において、
（ａ）前記硬質被覆層は、基体の表面を被覆する下部層と、該下部層の表面を被覆する上部層からなり、
（ｂ）上記下部層は、Ｔｉの炭化物層、窒化物層、炭窒化物層、炭酸化物層、および炭窒酸化物層のうちの１層または２種以上で構成され、かつ０．５〜１５μｍの合計平均層厚を有するＴｉ化合物層からなり、
（ｃ）上記下部層の表面を被覆する上部層は、上部内周層と、該上部内周層を被覆する上部外周層とからなり、
（ｄ）上記上部内周層は、
組成式：（Ａｌ１−ＸＣｒＸ）２Ｏ３（ただし、原子比で、Ｘは０．０５〜０．３５を示す）を満足し、かつ、０．５〜１３μｍの平均層厚を有するＡｌとＣｒの複合酸化物（（Ａｌ，Ｃｒ）２Ｏ３）層からなり、
（ｅ）上記上部内周層を被覆する上部外周層は、０．１〜０．８μｍの平均層厚を有する薄層Ａと、０．１〜０．６μｍの平均層厚を有する薄層Ｂとを交互に積層して形成された、２〜１０μｍの合計平均層厚を有する交互多重積層からなり、
（ｆ）上記薄層Ａは、シリコン酸化物（ＳｉＯ２）層からなり、
（ｇ）上記薄層Ｂは、
組成式：（Ａｌ１−ＸＣｒＸ）２Ｏ３（ただし、原子比で、Ｘは０．０５〜０．３５を示す）を満足するＡｌとＣｒの複合酸化物（（Ａｌ，Ｃｒ）２Ｏ３）層からなり、
前記硬質被覆層を、炭化タングステン基超硬合金または炭窒化チタン基サーメットで構成された基体の表面に化学蒸着により形成してなる、難削材の重切削加工で硬質被覆層がすぐれた耐チッピング性を発揮する被覆超硬工具（表面被覆超硬切削工具）に特徴を有するものである。
This invention was made based on the above research results, and in a coated carbide tool (surface coated carbide cutting tool) formed by forming a hard coating layer on the surface of a substrate,
(A) The hard coating layer comprises a lower layer covering the surface of the substrate and an upper layer covering the surface of the lower layer,
(B) The lower layer is composed of one or more of a Ti carbide layer, a nitride layer, a carbonitride layer, a carbonate layer, and a carbonitride layer, and 0.5 to Consisting of a Ti compound layer having a total average layer thickness of 15 μm,
(C) The upper layer covering the surface of the lower layer is composed of an upper inner peripheral layer and an upper outer peripheral layer covering the upper inner peripheral layer,
(D) The upper inner circumferential layer is
Composition formula: (Al 1-X Cr X ) 2 O 3 (wherein X is 0.05 to 0.35 in atomic ratio) and has an average layer thickness of 0.5 to 13 μm It consists of a complex oxide ((Al, Cr) 2 O 3 ) layer of Al and Cr,
(E) The upper outer peripheral layer covering the upper inner peripheral layer includes a thin layer A having an average layer thickness of 0.1 to 0.8 μm and a thin layer B having an average layer thickness of 0.1 to 0.6 μm. Formed by alternately laminating and having an alternating multiple lamination having a total average layer thickness of 2 to 10 μm,
(F) The thin layer A is composed of a silicon oxide (SiO 2 ) layer,
(G) The thin layer B is
A composite oxide of (Al, Cr) 2 that satisfies the composition formula: (Al 1-X Cr X ) 2 O 3 (wherein X represents 0.05 to 0.35 in atomic ratio). O 3 ) layer,
The hard coating layer is formed by chemical vapor deposition on the surface of a substrate made of tungsten carbide base cemented carbide or titanium carbonitride base cermet, and the hard coating layer has excellent chipping resistance due to heavy cutting of difficult-to-cut materials. It is characterized by a coated cemented carbide tool (surface coated cemented carbide cutting tool) that exhibits properties.
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。
（１）下部層（Ｔｉ化合物層）
Ｔｉ化合物層は、基本的には上部層の上部内周層を構成する（Ａｌ，Ｃｒ）２Ｏ３層の下部層として存在し、自身の具備するすぐれた高温強度によって硬質被覆層の高温強度向上に寄与するほか、超硬基体と上記上部内周層（（Ａｌ，Ｃｒ）２Ｏ３層）のいずれにも強固に密着し、よって硬質被覆層の超硬基体に対する密着性を向上させる作用を有するが、その合計平均層厚が０．５μｍ未満では、前記作用を十分に発揮させることができず、一方その合計平均層厚が１５μｍを越えると、切削時の発生熱によって偏摩耗の原因となる熱塑性変形を起し易くなることから、その合計平均層厚を０．５〜１５μｍと定めた。
（２）上部内周層（（Ａｌ，Ｃｒ）２Ｏ３層）
上記した通り上部内周層を構成する（Ａｌ，Ｃｒ）２Ｏ３層（従来硬質被覆層における上部層に相当）におけるＡｌ成分は高温硬さおよび耐熱性、同Ｃｒ成分は高温強度を向上させるが、ＡｌとＣｒ成分の相互含有割合を示す組成式：（Ａｌ１−ＸＣｒＸ）で、Ｘ値が原子比で（以下同じ）０．３５を越えると、相対的にＡｌの含有割合が低くなることから、層自体の高温硬さおよび耐熱性の低下は避けられず、これが摩耗促進の原因となり、一方、Ｘ値が０．０５未満になると、層自体の高温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ることから、Ｘ値を０．０５〜０．３５と定めた。
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.
(1) Lower layer (Ti compound layer)
The Ti compound layer basically exists as the lower layer of the (Al, Cr) 2 O 3 layer that constitutes the upper inner peripheral layer of the upper layer, and the high temperature strength of the hard coating layer by the excellent high temperature strength possessed by itself. In addition to contributing to the improvement, it firmly adheres to both the carbide substrate and the upper inner peripheral layer ((Al, Cr) 2 O 3 layer), thereby improving the adhesion of the hard coating layer to the carbide substrate. However, if the total average layer thickness is less than 0.5 μm, the above-mentioned effect cannot be sufficiently exerted. On the other hand, if the total average layer thickness exceeds 15 μm, the cause of uneven wear is caused by heat generated during cutting. Therefore, the total average layer thickness was determined to be 0.5 to 15 μm.
(2) Upper inner peripheral layer ((Al, Cr) 2 O 3 layer)
As described above, the Al component in the (Al, Cr) 2 O 3 layer (corresponding to the upper layer in the conventional hard coating layer) constituting the upper inner peripheral layer improves the high temperature hardness and heat resistance, and the Cr component improves the high temperature strength. Is a composition formula showing the mutual content ratio of Al and Cr components: (Al 1-X Cr X ), and when the X value exceeds 0.35 in terms of atomic ratio (hereinafter the same), the Al content ratio is relatively The lowering of the high-temperature hardness and heat resistance of the layer itself is unavoidable because it becomes lower, which causes wear promotion. On the other hand, when the X value is less than 0.05, the lowering of the high-temperature strength of the layer itself is avoided. As a result, chipping and the like are likely to occur, so the X value was set to 0.05 to 0.35.
また、その平均層厚が０．５μｍ未満では、所望の耐摩耗性を長期に亘って確保することができず、一方その平均層厚が１３μｍ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０．５〜１３μｍと定めた。
（３）上部外周層（薄層Ａと薄層Ｂとからなる交互多重積層）
（Ａｌ，Ｃｒ）２Ｏ３層からなる上部内周層は、高温硬さ、耐熱性、高温強度にすぐれるものの、潤滑性、表面滑り性が十分ではないため、切刃部への機械的負荷が大きなものとなる軟鋼、クロム鋼等の難削材の高送り、高切り込みでの重切削加工においては、切刃部への切粉の溶着を十分満足できる程度に防止し得なかったことから、上部内周層上に、潤滑性、表面滑り性にすぐれるＳｉＯ２層からなる薄層Ａと、（Ａｌ，Ｃｒ）２Ｏ３層からなる薄層Ｂとの交互多重積層を設けることにより、上部内周層の備える高温硬さ、耐熱性、高温強度の諸特性を特段低下させることなく、潤滑性、表面滑り性の改善を図った。つまり、薄層Ａと薄層Ｂの交互多重積層からなる上部外周層は、軟鋼、クロム鋼等の難削材の高送り、高切り込み条件下での重切削加工において、潤滑性、表面滑り性を改善することにより、切刃部への切粉の溶着を抑制する。
Further, if the average layer thickness is less than 0.5 μm, the desired wear resistance cannot be ensured over a long period of time, while if the average layer thickness exceeds 13 μm, chipping tends to occur. The average layer thickness was set to 0.5 to 13 μm.
(3) Upper outer peripheral layer (alternate multiple lamination consisting of thin layer A and thin layer B)
The upper inner peripheral layer made of (Al, Cr) 2 O 3 layer is excellent in high temperature hardness, heat resistance, and high temperature strength, but has insufficient lubricity and surface slipperiness, so it is mechanical to the cutting edge. In heavy cutting with high feed and high cutting of difficult-to-cut materials such as mild steel and chrome steel with heavy loads, it was not possible to prevent chip welding to the cutting edge to a satisfactory level. Therefore, on the upper inner peripheral layer, an alternate multiple lamination of a thin layer A composed of a SiO 2 layer excellent in lubricity and surface slipperiness and a thin layer B composed of an (Al, Cr) 2 O 3 layer is provided. As a result, the lubricity and the surface slipperiness were improved without particularly reducing the high temperature hardness, heat resistance, and high temperature strength characteristics of the upper inner circumferential layer. In other words, the upper outer peripheral layer consisting of alternating multiple layers of thin layer A and thin layer B provides lubricity and surface slip in heavy feed machining under high feed and high cutting conditions of difficult-to-cut materials such as mild steel and chrome steel. By improving the above, the welding of chips to the cutting edge portion is suppressed.
薄層Ａと薄層Ｂの交互多重積層（上部外周層）が、所定の潤滑性、表面滑り性を備え、その結果として、所定の耐チッピング、耐摩耗性を発揮するためには、薄層Ａは、少なくとも０．１μｍの厚さが必要とされ、これ未満の厚さでは重切削加工において必要とされる潤滑性、表面滑り性を発揮することができず、また、その厚みは０．８μｍ以下であれば、上部外周層の高温硬さ、耐熱性、高温強度の低下を招くことなく十分な潤滑性、表面滑り性をもたらすことができることから、薄層Ａの平均層厚を０．１〜０．８μｍに定めた。また、薄層Ｂの平均層厚が０．１μｍ未満の場合には、上部外周層に最小限必要とされる高温硬さ、耐熱性、高温強度を維持することができず、一方、交互積層する薄層Ｂの平均層厚が０．６μｍを超えるような場合には、上部外周層の全体層厚に占める薄層Ｂの割合が多いため、薄層Ａによる潤滑性、表面滑り性の効果が十分に期待できなくなることから、薄層Ｂの平均層厚を０．１〜０．６μｍに定めた。 In order to exhibit predetermined chipping resistance and wear resistance as a result of the alternating multiple lamination (upper outer peripheral layer) of the thin layer A and the thin layer B having the predetermined lubricity and surface slipperiness, the thin layer A is required to have a thickness of at least 0.1 μm. If the thickness is less than 0.1 μm, the lubricity and the surface slipperiness required for heavy cutting cannot be exhibited. If it is 8 μm or less, sufficient lubricity and surface slipperiness can be brought about without lowering the high-temperature hardness, heat resistance and high-temperature strength of the upper outer peripheral layer. It was set to 1 to 0.8 μm. In addition, when the average layer thickness of the thin layer B is less than 0.1 μm, the minimum required high temperature hardness, heat resistance, and high temperature strength cannot be maintained for the upper outer peripheral layer. When the average layer thickness of the thin layer B exceeds 0.6 μm, the ratio of the thin layer B to the total thickness of the upper outer peripheral layer is large. Therefore, the average layer thickness of the thin layer B was set to 0.1 to 0.6 μm.
そして、薄層Ａと薄層Ｂを、それぞれ前記所定平均層厚の薄層として交互に積層することにより、薄層Ａと薄層Ｂの交互多重積層からなる上部外周層は、すぐれた潤滑性、表面滑り性を有し、かつ、所定の高温硬さ、耐熱性、高温強度を具備したあたかも一つの層であるかのように機能する。ただ、上部外周層（交互多重積層）の合計平均層厚が２μｍ未満では、自身のもつすぐれた潤滑性、表面滑り性と所定の高温硬さ、耐熱性、高温強度を硬質被覆層に長期に亘って付与できず、工具寿命短命の原因となり、一方その合計平均層厚が１０μｍを越えると、チッピングが発生し易くなることから、その合計平均層厚を２〜１０μｍと定めた。 And by laminating the thin layers A and B alternately as the thin layers having the predetermined average layer thickness, the upper outer peripheral layer composed of the alternating multiple lamination of the thin layers A and B has excellent lubricity. It functions as if it is a single layer having surface slipperiness and having predetermined high-temperature hardness, heat resistance, and high-temperature strength. However, if the total average layer thickness of the upper outer peripheral layer (alternate multi-layer) is less than 2 μm, the hard coating layer will have its own excellent lubricity, surface slipperiness, predetermined high temperature hardness, heat resistance, and high temperature strength for a long time. However, when the total average layer thickness exceeds 10 μm, chipping tends to occur. Therefore, the total average layer thickness is set to 2 to 10 μm.
この発明の被覆超硬工具は、硬質被覆層を、超硬基体を覆う下部層、該下部層を覆う上部内周層、該上部内周層を覆う上部外周層で構成し、かつ、該上部外周層を薄層Ａ（ＳｉＯ２層）と薄層Ｂ（（Ａｌ，Ｃｒ）２Ｏ３層）との交互多重積層として構成することにより、硬質被覆層の下部層（Ｔｉ化合物層）および上部内周層（（Ａｌ，Ｃｒ）２Ｏ３層）の具備する高温硬さ、耐熱性、高温強度の諸特性を何ら損なうことなくこれを維持したままで、硬質被覆層がさらにすぐれた潤滑性、表面滑り性をも保持することになるので、各種の鋼、鋳鉄等の通常条件の切削加工に用いることができるばかりか、特に、切刃部への機械的負荷が大きなものとなる軟鋼、クロム鋼等の難削材の高送り、高切り込み条件の重切削加工においても、下部層であるＴｉ化合物層の具備するすぐれた層間密着性および高温強度と相俟って、切刃部への切粉の溶着が低減され、また、これを原因とする偏摩耗の発生が抑制されることによって、硬質被覆層がすぐれた耐チッピング性を示し、長期に亘ってすぐれた耐摩耗性を発揮するのである。 In the coated carbide tool of the present invention, the hard coating layer is composed of a lower layer covering the carbide substrate, an upper inner circumferential layer covering the lower layer, an upper outer circumferential layer covering the upper inner circumferential layer, and the upper portion. By configuring the outer peripheral layer as an alternating multiple lamination of thin layer A (SiO 2 layer) and thin layer B ((Al, Cr) 2 O 3 layer), the lower layer (Ti compound layer) and upper part of the hard coating layer Lubricant with a hard coating layer that maintains the high-temperature hardness, heat resistance, and high-temperature strength characteristics of the inner peripheral layer ((Al, Cr) 2 O 3 layer) without any loss. In addition, since it also retains surface slipperiness, it can be used not only for cutting under normal conditions such as various types of steel and cast iron, but in particular, mild steel that has a large mechanical load on the cutting edge, Even in heavy cutting with high feed and high cutting conditions for difficult-to-cut materials such as chrome steel, Combined with the excellent interlaminar adhesion and high-temperature strength of the Ti compound layer, the adhesion of chips to the cutting edge is reduced, and the occurrence of uneven wear due to this is suppressed. As a result, the hard coating layer exhibits excellent chipping resistance, and exhibits excellent wear resistance over a long period of time.
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。 Next, the coated carbide tool of the present invention will be specifically described with reference to examples.
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、ＴｉＮ粉末、ＴａＣ粉末、ＮｂＣ粉末、Ｃｒ３Ｃ２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：０．０７のホーニング加工を施してＩＳＯ規格・ＣＮＭＧ１２０４０８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。 As raw material powders, WC powder, TiC powder, TiN 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 honing of R: 0.07, and the carbide bases A1 to A10 made of WC-base cemented carbide having ISO standard CNMG120408 chip shape Formed.
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（質量比で、ＴｉＣ／ＴｉＮ＝５０／５０）粉末、Ｍｏ２Ｃ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：０．０７のホーニング加工を施してＩＳＯ規格・ＣＮＭＧ１２０４０８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。 In addition, as raw material powders, TiCN (mass ratio, TiC / TiN = 50/50) powder, Mo 2 C powder, ZrC powder, NbC powder, TaC powder, WC, all having an average particle diameter of 0.5 to 2 μm. Prepare powder, Co powder, and Ni powder, mix these raw material powders into the composition shown in Table 2, wet mix for 24 hours with a ball mill, dry, and press-mold into green compact at 100 MPa pressure The green compact was sintered in a nitrogen atmosphere of 2 kPa at a temperature of 1500 ° C. for 1 hour. After sintering, the cutting edge portion was subjected to a honing process of R: 0.07 and ISO standard TiCN-based cermet carbide substrates B1 to B6 having a chip shape of CNMG120408 were formed.
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、表３（表３中のｌ−ＴｉＣＮは特開平６−８０１０号公報に記載される縦長成長結晶組織をもつＴｉＣＮ層の形成条件を示すものであり、これ以外は通常の粒状結晶組織の形成条件を示すものである）に示される通常の条件にて、表６に示される組み合わせおよび目標平均層厚のＴｉ化合物層を硬質被覆層の下部層として蒸着形成した。
つぎに、表４に示される条件で、かつ同じく表６に示される目標平均層厚の（Ａｌ，Ｃｒ）２Ｏ３層を硬質被覆層の上部内周層として蒸着形成した。
その後、表５に示される条件で、かつ同じく表６に示される目標平均層厚のＳｉＯ２層を、硬質被覆層の上部外周層の薄層Ａとして蒸着形成し、ついで、表４に示される条件で、かつ同じく表６に示される目標平均層厚の（Ａｌ，Ｃｒ）２Ｏ３層を、硬質被覆層の上部外周層の薄層Ｂとして蒸着形成した。薄層Ａと薄層Ｂの蒸着形成は、上部外周層の目標合計平均層厚に達するまで、交互に繰り返し行い、本発明表面被覆超硬切削工具である本発明表面被覆超硬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。
Each of the above-mentioned carbide substrates A1 to A10 and B1 to B6 is ultrasonically cleaned in acetone and dried, and then placed in the chemical vapor deposition apparatus shown in FIG. 1 and the carbide substrate support pallet shown in FIG. First, Table 3 (l-TiCN in Table 3 indicates the conditions for forming a TiCN layer having a vertically grown crystal structure described in JP-A-6-8010). In the normal conditions shown in Table 6 above, the combinations shown in Table 6 and the Ti compound layer with the target average layer thickness are applied to the hard coating layer. Vapor deposition was formed as the lower layer.
Next, an (Al, Cr) 2 O 3 layer having the target average layer thickness shown in Table 6 under the conditions shown in Table 4 was formed by vapor deposition as the upper inner peripheral layer of the hard coating layer.
Thereafter, the SiO 2 layer having the target average layer thickness also shown in Table 6 under the conditions shown in Table 5 was formed by vapor deposition as a thin layer A of the upper outer peripheral layer of the hard coating layer, and then shown in Table 4 The (Al, Cr) 2 O 3 layer having the target average layer thickness shown in Table 6 under the same conditions was deposited as a thin layer B of the upper outer peripheral layer of the hard coating layer. The vapor deposition of the thin layer A and the thin layer B is alternately repeated until the target total average layer thickness of the upper outer peripheral layer is reached, and the surface-coated carbide throwaway tip of the present invention which is the surface-coated carbide cutting tool of the present invention ( Hereinafter, the coated carbide chips of the present invention were produced.
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、表７に示されるＴｉ化合物層を硬質被覆層の下部層として蒸着形成した（なお、表７に示される従来被覆超硬工具１〜１６の下部層（Ｔｉ化合物層）は、本発明被覆超硬工具１〜１６のそれぞれと同じにしてあるので、下部層の具体的な形成条件、目標平均層厚は、表３、表６に示されているとおりである）。
次に、表４に示される条件で、かつ同じく表７に示される目標平均層厚の（Ａｌ，Ｃｒ）２Ｏ３層を硬質被覆層の上部層として下部層（Ｔｉ化合物層）の表面に蒸着形成し、従来表面被覆超硬切削工具としての従来表面被覆超硬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。
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 Ti compound layer shown in Table 7 was vapor-deposited as the lower layer of the hard coating layer (Note that the lower layer (Ti compound layer) of the conventional coated carbide tools 1 to 16 shown in Table 7 was coated with the present invention. Since it is the same as each of the hard tools 1-16, the specific formation conditions of the lower layer and the target average layer thickness are as shown in Tables 3 and 6.
Next, the (Al, Cr) 2 O 3 layer having the target average layer thickness shown in Table 7 under the conditions shown in Table 4 is used as the upper layer of the hard coating layer on the surface of the lower layer (Ti compound layer). The conventional surface-coated carbide throwaway tips (hereinafter referred to as conventional coated carbide tips) 1 to 16 as conventional surface-coated carbide cutting tools were produced by vapor deposition.
つぎに、上記の各種の被覆超硬チップを、いずれも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、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、
被削材：ＪＩＳ・ＳＣｒ４１５Ｈの丸棒、
切削速度： ３００ ｍ／ｍｉｎ．、
切り込み： ５．５ ｍｍ、
送り： ０．４ ｍｍ／ｒｅｖ．、
切削時間： ５ 分、
の条件（切削条件Ａという）でのクロム鋼の乾式連続高切り込み切削加工試験（通常の切り込み量は２．０ｍｍ）、
被削材：ＪＩＳ・ＳＳ４００の長さ方向等間隔４本縦溝入り丸棒、
切削速度： ３５０ ｍ／ｍｉｎ．、
切り込み： ６．０ ｍｍ、
送り： ０．３ ｍｍ／ｒｅｖ．、
切削時間： ５ 分、
の条件（切削条件Ｂという）での軟鋼の乾式断続高切り込み切削加工試験（通常の切り込み量は１．５ｍｍ）、
被削材：ＪＩＳ・ＳＣｒ４３０Ｈの丸棒、
切削速度： ３００ ｍ／ｍｉｎ．、
切り込み： ２．０ ｍｍ、
送り： ０．６ ｍｍ／ｒｅｖ．、
切削時間： ５ 分、
の条件（切削条件Ｃという）でのクロム鋼の乾式連続速高送り切削加工試験（通常の送りは０．３ｍｍ／ｒｅｖ．）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８に示した。
Next, the coated carbide chips 1 to 16 of the present invention and the conventional coated carbide chip 1 in the state in which each of the various coated carbide chips is screwed to the tip of the tool steel tool with a fixing jig. About ~ 16
Work material: JIS / SCr415H round bar,
Cutting speed: 300 m / min. ,
Cutting depth: 5.5 mm,
Feed: 0.4 mm / rev. ,
Cutting time: 5 minutes,
Dry continuous high-cut cutting test of chrome steel under the above conditions (referred to as cutting condition A) (normal cutting amount is 2.0 mm),
Work material: JIS / SS400 lengthwise equidistant 4 round bars with flutes,
Cutting speed: 350 m / min. ,
Cutting depth: 6.0 mm,
Feed: 0.3 mm / rev. ,
Cutting time: 5 minutes,
Dry interrupted high cut cutting test of mild steel under the conditions (cutting condition B) (normal cutting depth is 1.5 mm),
Work material: JIS / SCr430H round bar,
Cutting speed: 300 m / min. ,
Cutting depth: 2.0 mm,
Feed: 0.6 mm / rev. ,
Cutting time: 5 minutes,
The dry continuous high-feed cutting test for chrome steel under the above conditions (referred to as cutting condition C) (normal feed is 0.3 mm / rev.). It was measured. The measurement results are shown in Table 8.
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の硬質被覆層を構成する各層について、その組成を、オージェ分光分析装置を用いて測定したところ、いずれのＴｉ化合物層、（Ａｌ，Ｃｒ）２Ｏ３層も目標組成と実質的に同じ組成を示し、各層の層厚も目標平均層厚と実質的に同じ値を示した。さらに、本発明被覆超硬チップ１〜１６の硬質被覆層の上部外周層の薄層Ａを構成するＳｉＯ２層についても、目標平均層厚と実質的に同じ値を示すＳｉＯ２層が形成されていることが確認された。 About each layer which comprises the hard coating layer of this invention coated carbide | carbonized_material chip | tip 1-16 obtained as a result of this and the conventional coated carbide | carbonized_material chip | tip 1-16, when the composition was measured using the Auger spectroscopic analyzer, The Ti compound layer and the (Al, Cr) 2 O 3 layer also showed substantially the same composition as the target composition, and the layer thickness of each layer also showed substantially the same value as the target average layer thickness. Further, the SiO 2 layer constituting the thin layer A of the upper outer peripheral layer of the hard coating layer of the coated carbide chips 1 to 16 of the present invention is also formed with an SiO 2 layer having substantially the same value as the target average layer thickness. It was confirmed that
表８に示される結果から、硬質被覆層の上部層が、上部内周層（（Ａｌ，Ｃｒ）２Ｏ３層）と、薄層Ａ（ＳｉＯ２層）及び薄層Ｂ（（Ａｌ，Ｃｒ）２Ｏ３層）の交互多重積層からなる上部外周層とで構成されている本発明被覆超硬チップ１〜１６は、軟鋼、クロム鋼などの難削材の切削加工を、切刃部への機械的負荷が大きなものとなる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潤滑性、表面滑り性を呈し、優れた耐チッピング性、耐摩耗性を長期に亘って発揮するのに対して、硬質被覆層の上部層が、（Ａｌ，Ｃｒ）２Ｏ３層のみからなる従来被覆超硬チップ１〜１６においては、特に前記上部層の潤滑性、表面滑り性不足が原因して、チッピングが発生し易く、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 Table 8, the upper layer of the hard coating layer is the upper inner peripheral layer ((Al, Cr) 2 O 3 layer), the thin layer A (SiO 2 layer) and the thin layer B ((Al, Cr). ) The coated carbide chips 1 to 16 of the present invention, which are composed of upper outer peripheral layers made up of two or more layers of 2 O 3 layers), can cut difficult-to-cut materials such as mild steel and chrome steel to the cutting edge. Even when performed under heavy cutting conditions such as high cutting and high feed that increase the mechanical load, the hard coating layer exhibits excellent lubricity and surface slipperiness, and excellent chipping and wear resistance. In the conventional coated cemented carbide chips 1 to 16 in which the upper layer of the hard coating layer is composed of only the (Al, Cr) 2 O 3 layer, the lubricity of the upper layer is particularly good. , Chipping is likely to occur due to insufficient surface slipperiness, and the service life is reached in a relatively short time. It is clear that
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、特に軟鋼、クロム鋼などの難削材を、高切り込みや高送りなどの重切削条件で切削加工を行なった場合にも、すぐれた潤滑性、表面滑り性を呈し、溶着、偏摩耗を生じることなく良好な耐チッピング性を発揮し、長期に亘ってすぐれた耐摩耗性を示すものであるから、切削装置のＦＡ化、並びに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。 As described above, the coated carbide tool of the present invention is capable of cutting difficult-to-cut materials such as mild steel and chrome steel under heavy cutting conditions such as high cutting and high feed, as well as cutting under normal conditions. Even when processed, it exhibits excellent lubricity and surface slip, exhibits good chipping resistance without causing welding and uneven wear, and exhibits excellent wear resistance over a long period of time. Therefore, it is possible to satisfactorily cope with the FA of the cutting device, the labor saving and energy saving of the cutting process, and the cost reduction.
Claims (1)
（ａ）前記硬質被覆層は、基体の表面を被覆する下部層と、該下部層の表面を被覆する上部層からなり、
（ｂ）上記下部層は、Ｔｉの炭化物層、窒化物層、炭窒化物層、炭酸化物層、および炭窒酸化物層のうちの１層または２種以上で構成され、かつ０．５〜１５μｍの合計平均層厚を有するＴｉ化合物層からなり、
（ｃ）上記下部層の表面を被覆する上部層は、上部内周層と、該上部内周層を被覆する上部外周層とからなり、
（ｄ）上記上部内周層は、
組成式：（Ａｌ１−ＸＣｒＸ）２Ｏ３（ただし、原子比で、Ｘは０．０５〜０．３５を示す）を満足し、かつ、０．５〜１３μｍの平均層厚を有するＡｌとＣｒの複合酸化物層からなり、
（ｅ）上記上部内周層を被覆する上部外周層は、０．１〜０．８μｍの平均層厚を有する薄層Ａと、０．１〜０．６μｍの平均層厚を有する薄層Ｂとを交互に積層して形成された、２〜１０μｍの合計平均層厚を有する交互多重積層からなり、
（ｆ）上記薄層Ａは、シリコン酸化物（ＳｉＯ２）層からなり、
（ｇ）上記薄層Ｂは、
組成式：（Ａｌ１−ＸＣｒＸ）２Ｏ３（ただし、原子比で、Ｘは０．０５〜０．３５を示す）を満足するＡｌとＣｒの複合酸化物層からなり、
前記硬質被覆層を、炭化タングステン基超硬合金または炭窒化チタン基サーメットで構成された基体の表面に化学蒸着により形成してなる、難削材の重切削加工で硬質被覆層がすぐれた耐チッピング性を発揮する表面被覆超硬切削工具。
In a surface-coated cemented carbide cutting tool in which a hard coating layer is formed on the surface of a substrate composed of a tungsten carbide-based cemented carbide alloy or a titanium carbonitride-based cermet,
(A) The hard coating layer comprises a lower layer covering the surface of the substrate and an upper layer covering the surface of the lower layer,
(B) The lower layer is composed of one or more of a Ti carbide layer, a nitride layer, a carbonitride layer, a carbonate layer, and a carbonitride layer, and 0.5 to Consisting of a Ti compound layer having a total average layer thickness of 15 μm,
(C) The upper layer covering the surface of the lower layer is composed of an upper inner peripheral layer and an upper outer peripheral layer covering the upper inner peripheral layer,
(D) The upper inner circumferential layer is
Composition formula: (Al 1-X Cr X ) 2 O 3 (wherein X is 0.05 to 0.35 in atomic ratio) and has an average layer thickness of 0.5 to 13 μm It consists of a complex oxide layer of Al and Cr,
(E) The upper outer peripheral layer covering the upper inner peripheral layer includes a thin layer A having an average layer thickness of 0.1 to 0.8 μm and a thin layer B having an average layer thickness of 0.1 to 0.6 μm. Formed by alternately laminating and having an alternating multiple lamination having a total average layer thickness of 2 to 10 μm,
(F) The thin layer A is composed of a silicon oxide (SiO 2 ) layer,
(G) The thin layer B is
It consists of a composite oxide layer of Al and Cr that satisfies the composition formula: (Al 1-X Cr X ) 2 O 3 (where X is 0.05 to 0.35 in atomic ratio),
The hard coating layer is formed by chemical vapor deposition on the surface of a substrate made of tungsten carbide base cemented carbide or titanium carbonitride base cermet, and the hard coating layer has excellent chipping resistance due to heavy cutting of difficult-to-cut materials. Surface coated carbide cutting tool that demonstrates its properties.
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| JP2013188852A (en) * | 2012-03-15 | 2013-09-26 | Mitsubishi Materials Corp | Surface-coated cutting tool exhibiting superior chipping resistance, peeling resistance and wearing resistance |
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| JP2013188852A (en) * | 2012-03-15 | 2013-09-26 | Mitsubishi Materials Corp | Surface-coated cutting tool exhibiting superior chipping resistance, peeling resistance and wearing resistance |
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