JP2009255233A - Surface coated cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface coated cutting tool having a hard coating layer exhibiting superior chipping resistance in high-speed intermittent cutting of stainless steel, heat resisting steel or the like. <P>SOLUTION: As the hard coating layer, an innermost layer consisting of TiN, an inner layer consisting of high nitrogen TiCN, an internal adhesive layer consisting of TiCO, TiCNO, an intermediate layer consisting of α-type Al<SB>2</SB>O<SB>3</SB>, an external adhesive layer consisting of TiCO, TiCNO, and an outer layer consisting of a single layer or a lamination of ZrN, ZrCN and ZrC are formed by vapor deposition on the surface of a tool base body. Further, dry- or wet-blast treatment is applied to the surface of the hard coating layer to smoothen the surface of the hard coating layer and reduce residual stress. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  This invention is when cutting a work material such as stainless steel, heat-resistant steel, etc. under high-speed intermittent cutting conditions that involve high heat generation and an intermittent and impactful high load on the cutting edge. Even so, the present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool) in which the hard coating layer exhibits excellent chipping resistance.

Conventionally, a 3 μm TiC layer as an inner layer is formed on the surface of a substrate composed of tungsten carbide group (WC group) cemented carbide or titanium carbonitride group (TiCN group) cermet (hereinafter collectively referred to as a tool substrate), A coating tool (hereinafter referred to as a conventional coating tool 1) is known in which a hard coating layer of 1 μm Al ₂ O ₃ layer as an intermediate layer, 2 μm ZrN layer and ZrCN layer as an outer layer is vapor-deposited, and this coating tool Is known to exhibit excellent wear resistance in cutting of alloy steel.
Further, on the surface of the tool base, one or more of a TiC layer, a TiN layer, and a TiCN layer as an inner layer, an Al ₂ O ₃ layer as an intermediate layer, and ZrC as an outer layer (however, a region other than the cutting edge portion) After vapor-depositing a Zr compound film consisting of any one of layer, ZrN layer, and ZrCN layer, the blade edge is polished with a rubber grindstone to expose the Al ₂ O ₃ layer, which is an intermediate layer, and at the same time improve smoothness On the other hand, there is known a coated tool (hereinafter referred to as a conventional coated tool 2) in which an outer layer made of a Zr compound film is formed in a region other than the blade edge portion, and hardness and slidability are improved. The cutting edge of the alloy steel has a cutting edge where the Al ₂ O ₃ layer is exposed has excellent welding resistance, and the outer layer made of a Zr compound film has high-temperature hardness and excellent impact resistance. Excellent tool characteristics in machining It is known that to exert over.
JP 54-28316 A JP 2001-47305 A

In recent years, there has been a strong demand for labor saving and energy saving in cutting work, and accordingly, machining conditions have been further increased and high-efficiency machining has been demanded. By the way, when the above-described conventional coated tools 1 and 2 are used and intermittent cutting is performed on a work material such as stainless steel and heat-resistant steel at a normal cutting speed (about 200 m / min or less), the special problem is Although not seen, for example, when performing intermittent cutting under high-speed cutting conditions with a cutting speed of 250 m / min or more, abnormal damage such as chipping is likely to occur in the cutting edge, and as a result, comparison At present, the service life is reached in a short time.

  In view of the above, the inventors of the present invention have developed a hard coating layer in order to improve the chipping resistance of a hard coating layer when a work material such as stainless steel or heat-resistant steel is cut under high-speed intermittent conditions. As a result of diligent research focusing on the relationship between the internal stress of the coating layer and the occurrence of chipping, the following findings were obtained.

(A) First, as a result of observing the damaged state of the cutting edge of a coated tool when a work material such as stainless steel or heat-resistant steel is machined under high-speed intermittent conditions, the present inventors have observed chipping on the surface of the hard coating layer. It was found that the process progressed from an existing crack. The crack existing on the surface of the hard coating layer is formed by, for example, barrel treatment performed for the purpose of smoothing the hard coating layer and releasing the tensile stress remaining in the hard coating layer after coating the hard layer on the tool base surface. It was also found that the crack was introduced by shot brass and processing.
Usually, a hard coating layer formed by chemical vapor deposition at a high temperature of 800 to 1000 ° C. has a hard coating layer in the cooling process due to a difference in the degree of thermal expansion between the material constituting the tool base and the hard coating layer. The tensile stress generated in the film remains or cannot withstand the tensile residual stress, and cracks are generated and exist in a part of the hard coating layer (hereinafter referred to as “ Called cooling cracks). In addition, mechanical treatment such as barrel treatment and shot blast treatment is performed for the purpose of alleviating and releasing residual stress existing in the hard coating layer. By applying this mechanical treatment, cooling cracks are expanded. Or the density of cracks existing in the hard coating layer is increased (hereinafter referred to as “secondary cracks” in order to distinguish such cracks formed by mechanical treatment from the above-mentioned cooling cracks). Called).
And, when cutting the work material such as stainless steel, heat-resistant steel, etc. under high-speed intermittent cutting conditions with high heat generation and intermittent and impact load on the cutting edge, It has been found that the presence of the secondary crack reduces the strength of the hard coating layer and causes abnormal damage such as chipping.

(B) Therefore, the present inventors configured the inner layer referred to in the above-described conventional coated tools 1 and 2 to have a layer structure including the innermost layer, the inner layer, and the inner adhesion layer, and also referred to as the above-described conventional coated tools 1 and 2. The outer layer is composed of a layer structure composed of an outer adhesion layer and an outer layer. In particular, in the present invention, the inner layer is a TiCN layer having a high nitrogen content (hereinafter, simply referred to as a high nitrogen TiCN layer), and the outer layer is zirconium nitride ( Hereinafter, it is composed of a single layer or a multilayer composed of any one of a ZrN layer, a zirconium carbonitride (hereinafter referred to as ZrCN) layer, and a zirconium carbide (hereinafter referred to as ZrC) layer. -A coated tool having a hard coating layer with a specific layer structure of-inner adhesion layer-intermediate layer-outer adhesion layer-outer layer was prepared and subjected to high-speed intermittent cutting of stainless steel, heat-resistant steel, etc. Specific layer Coated tool having a forming, it without that cause abnormal damage such as chipping, over a long period of use, it was found that exhibited excellent tool characteristics.

(C) The hard coating layer having the specific layer structure of the innermost layer-inner layer-inner adhesion layer-intermediate layer-outer adhesion layer-outer layer exhibits excellent chipping resistance as follows. This is presumably due to various reasons.
That is, in the hard coating layer having the structure of the innermost layer-inner layer-inner adhesion layer-intermediate layer-outer adhesion layer-outer layer, the tensile residual stress after vapor deposition of the hard coating layer is changed from the innermost layer side to the outer layer side. The stress distribution decreases as it goes (see FIG. 1). Then, after the hard coating layer having the above layer structure (stress distribution) is formed, when the outer layer surface is subjected to dry or wet blasting, the outer layer is sufficiently released of residual stress. However, the innermost layer is tightly bonded to the tool base and the inner layer to the inner adhesive layer, and the innermost layer or inner layer is originally subjected to a large tensile residual stress. Alternatively, complete release of residual stress cannot be performed on the inner layer side. Then, the tensile residual stress remaining in the innermost layer or the inner layer, that is, the tensile residual stress remaining in the innermost layer and the inner layer, which could not be released by the blasting process, passes through the intermediate layer and the outer adhesive layer to the outer layer. Thus, it acts as a compressive stress (see FIG. 2). As a result, the expansion of cooling cracks existing in the outer layer is suppressed, and further, the introduction of excessive secondary cracks due to the blast treatment is suppressed. become. Therefore, even in high-speed intermittent cutting such as stainless steel and heat-resistant steel, where the cutting blade is subjected to intermittent and shocking high loads under high temperature conditions, the hard coating layer exhibits excellent chipping resistance and can be used for a long time. Excellent performance will be exhibited.

This invention has been made based on the above findings,
In a surface-coated cutting tool in which a hard coating layer is deposited on the surface of a tool base composed of a tungsten carbide-based cemented carbide or a titanium carbonitride-based cermet,
(A) a titanium nitride layer having an average layer thickness of 0.1 to 0.5 μm as the innermost layer;
(B) As an inner layer,
Composition formula: Ti (C _X N _1-X )
X represents 0.2 to 0.5 (provided that the atomic ratio), and a titanium carbonitride layer having an average layer thickness of 1 to 3 μm,
(C) As an adhesion layer between the inner layer and the intermediate layer, an inner adhesion layer having a total average layer thickness of 0.1 to 1 μm and comprising one or more of a titanium carbonate layer or a titanium carbonitride oxide layer,
(D) an α-type aluminum oxide layer having an average layer thickness of 1 to 5 μm as an intermediate layer;
(E) As an adhesion layer between the intermediate layer and the outer layer, an outer adhesion layer having a total average layer thickness of 0.1 to 1 μm and comprising one or more of a titanium carbonate layer or a titanium carbonitride oxide layer,
(F) The outer layer has a total average layer thickness of 3 to 10 μm, and is a single layer or two or more layers made of any one of a zirconium nitride layer, a zirconium carbonitride layer, and a zirconium carbide layer A multi-layer consisting of a combination of
A surface-coated cutting tool in which a dry or wet blast is applied to the surface of a hard coating layer composed of the layers (a) to (f). "
It has the characteristics.

The reason why the constituent layers of the hard coating layer of the coated tool of the present invention are limited as described above will be described below.

(a) Innermost layer (TiN layer)
The innermost TiN layer has a predetermined high-temperature hardness, prevents the binder component from the tool base from diffusing into the hard coating layer, and contributes to improving the adhesion strength between the hard coating layer and the tool base. However, if the average layer thickness is less than 0.1 μm, the desired effect cannot be exerted. On the other hand, if the average layer thickness exceeds 0.5 μm, the residual stress value of the inner layer is affected, and the outer layer side is moved toward. Therefore, it becomes difficult to form a stress distribution in which the tensile residual stress gradually decreases, so the average layer thickness was determined to be 0.1 to 0.5 μm.

(b) The inner layer composed of the inner titanium carbonitride layer (TiCN layer) has excellent adhesion strength with respect to both the innermost layer (TiN layer) and the inner adhesion layer (TiCO layer, TiCNO layer).
The inner TiCN layer,
Composition formula: Ti (C _X N _1-X )
In this case, X needs to satisfy 0.2 to 0.5 (atomic ratio) for the following reason.
That is, the thermal expansion coefficient of the α-type aluminum oxide layer (α-type Al ₂ O ₃ layer) that is the intermediate layer is around 8.2 × 10 ⁻⁶ / ° C., so that the residual tensile stress decreases toward the outer layer side. In order to achieve this, it is necessary that the thermal expansion coefficient of the inner layer be larger than that of the intermediate layer. For that purpose, in the composition formula: Ti (C _X N _1-X ), the value of X is set to Must be 0.5 or less. However, if the value of X is smaller than 0.2, the residual tensile stress generated in the inner layer becomes too large, the strength of the inner layer itself is reduced, and abnormal damage such as chipping is likely to occur. It was determined to be 0.2 to 0.5. Moreover, if the average layer thickness of the inner layer is less than 1 μm, it is difficult to form a stress distribution in which the tensile residual stress gradually decreases toward the outer layer side. Since abnormal damage is likely to occur during feed cutting, the average inner layer thickness was set to 1 to 3 μm.

(c) Inner adhesion layer (TiCO layer, TiCNO layer)
The inner adhesion layer consisting of one or more of a titanium carbonate layer (TiCO layer) or a titanium carbonitride oxide layer (TiCNO layer) increases the adhesion strength between the inner layer and the intermediate layer (α-type Al ₂ O ₃ layer) and is hard There is an effect of improving the chipping resistance of the coating layer. However, when the total average layer thickness is less than 0.1 μm, the effect of improving the adhesion strength is not observed. On the other hand, when the layer thickness exceeds 1 μm, the original TiCO layer, TiCNO Since the strength of the layer is inferior to that of the TiCN layer or α-type Al ₂ O ₃ layer, abnormal damage such as chipping is likely to occur, so the total average layer thickness is determined to be 0.1 to 1 μm. .

(D) Intermediate layer (α-type Al ₂ O ₃ layer)
The α-type Al ₂ O ₃ layer, which is an intermediate layer, is a thermally and chemically very stable layer and has excellent high-temperature hardness and heat resistance to ensure the wear resistance of the coated tool. If the average layer thickness is less than 1 μm, the desired performance cannot be achieved. On the other hand, if the average layer thickness exceeds 5 μm, abnormal damage is likely to occur during high-speed intermittent cutting of stainless steel, heat-resistant steel, etc. Therefore, the average layer thickness of the intermediate layer was determined to be 1 to 5 μm.

(e) Outer adhesion layer (TiCO layer, TiCNO layer)
As in the case of the inner adhesion layer, the outer adhesion layer composed of one or more of a titanium carbonate layer (TiCO layer) or a titanium carbonitride oxide layer (TiCNO layer) is an intermediate layer (α-type Al ₂ O ₃ layer). Although it has the effect of increasing the adhesion strength with the outer layer and improving the chipping resistance of the hard coating layer, if the total average layer thickness is less than 0.1 μm, the effect of improving the adhesion strength is not seen, while the layer thickness is 1 μm. Exceeds the above, the strength of the TiCO layer and TiCNO layer is inherently inferior to that of the TiCN layer and α-type Al ₂ O ₃ layer, and abnormal damage such as chipping is likely to occur. Was determined to be 0.1 to 1 μm.

(f) The outer layer is a single layer composed of any one of a zirconium nitride layer (ZrN layer), a zirconium carbonitride layer (ZrCN layer) and a zirconium carbide layer (ZrC layer), or two or more layers. It is composed of a combination of multiple layers, and has excellent adhesion strength to the outer adhesion layer (TiCO layer, TiCNO layer).
The reason for configuring the outer layer as a single layer or multiple layers of a ZrN layer, a ZrCN layer, and a ZrC layer is as follows.
First, since the thermal expansion coefficient of the α-type aluminum oxide layer (α-type Al ₂ O ₃ layer), which is an intermediate layer, is around 8.2 × 10 ⁻⁶ / ° C., the residual tensile stress decreases toward the outer layer side. In order to achieve this, it is necessary to make the thermal expansion coefficient of the outer layer smaller than that of the intermediate layer, but the thermal expansion coefficients of the ZrN layer, ZrCN layer, and ZrC layer are all smaller than that of the intermediate layer. Therefore, the residual tensile stress of the outer layer is reduced, and the ZrN layer, ZrCN layer, and ZrC layer are all excellent in heat resistance, high temperature strength, and high temperature hardness. It also demonstrates excellent chipping resistance even when the cutting material is subjected to high-temperature intermittent cutting with high heat generation and intermittent and impact load on the cutting edge. Depending on the reason.
However, if the total average layer thickness of the outer layer is less than 3 μm, it is difficult to form a stress distribution in which the tensile residual stress gradually decreases toward the outer layer side. On the other hand, if the total average layer thickness exceeds 10 μm, high speed Since abnormal damage is likely to occur during intermittent cutting, the total average layer thickness of the outer layers was determined to be 3 to 10 μm.

In the present invention, after the hard coating layer having the structure of innermost layer-inner layer-inner adhesion layer-intermediate layer-outer adhesion layer-outer layer is formed by vapor deposition, the surface of the hard coating layer is smoothed and the residual stress is reduced. In addition, Al ₂ O ₃ particles and SiC particles are subjected to dry or wet blast treatment using compressed air or water pressure, but the surface roughness of the hard coating layer outer surface after the treatment is measured in accordance with the compliant standard JIS B0601-1994. By performing the treatment so that Ra is 0.3 μm or less, preferably 0.2 μm or less, it is possible to effectively suppress the occurrence of abnormal damage to the hard coating layer during high-speed intermittent cutting.

  The coated tool of the present invention has a layer structure of innermost layer-inner layer-inner adhesion layer-intermediate layer-outer adhesion layer-outer layer so that the tensile residual stress gradually decreases from the innermost layer side to the outer layer side. After the coating layer is formed by vapor deposition, a compressive stress is applied to the outer layer by blasting the surface of the outer layer having excellent heat resistance, high temperature strength, and high temperature hardness, and cooling cracks existing in the outer layer. Suppresses the expansion of the secondary cracks and suppresses the formation of excessive secondary cracks, resulting in high heat generation and excellent high-speed intermittent cutting with intermittent and impact loads on the cutting edge. It exhibits chipping resistance and exhibits excellent cutting performance over a long period of time.

  Next, the coated tool of the present invention will be specifically described with reference to examples.

As raw material powders, WC powder, TiC powder, TaC powder, NbC powder, Cr ₃ C ₂ powder, TiN powder and Co powder all having an average particle diameter of 1 to 3 μm were prepared. After blending to the composition shown, adding wax, ball mill mixing in alcohol for 10 hours and drying under reduced pressure, ISO · CNMG120408 (Carbide substrate AD) and ISO · SEEN1203AFTN1 (Carbide) at 98 MPa pressure The green compact is pressed into a green compact of a predetermined shape of the substrates E and F), and the green compact is vacuum sintered in a vacuum of 5 Pa at a predetermined temperature within a range of 1370 to 1470 ° C. for 1 hour. After the sintering, R: 0.07 mm honing is performed for the carbide substrates A to D, and for the carbide substrates E and F, the cutting edge has a width of 0.15 mm and an angle of 2 The tool bases A to F made of WC-based cemented carbide were manufactured by performing 0 degree Chamfor Honing.

Next, the innermost layer, the inner layer, the inner adhesion layer, the intermediate layer, the outer adhesion layer, and the outer layer are respectively shown in Table 4 on the surfaces of these tool bases A to F under the conditions shown in Tables 2 and 3. A hard coating layer is formed by chemical vapor deposition so as to achieve a target (total) average layer thickness, and then a polishing liquid containing 15 mass% of Al ₂ O ₃ abrasive grains on the hard layer surface (outer layer) is projected at a projection pressure of 0. The coated tools 1-18 of the present invention having the surface roughness shown in Table 4 were produced by blasting under the condition of 2 MPa.

  For the purpose of comparison, a hard coating layer is chemically vapor-deposited on the surfaces of the tool bases A to F under the conditions shown in Tables 2 and 3 to produce a coated tool (layer structure corresponding to the conventional coated tool 1). By subjecting the surface of the hard coating layer to blasting under the same conditions as those of the coated tools 1 to 18 of the present invention, the comparative coated tool 1 having the layer structure, target total (average) layer thickness, and surface roughness shown in Table 5 ~ 9 were produced.

Furthermore, for the purpose of comparison, a hard coating layer is chemically vapor-deposited on the surfaces of the tool bases A to F under the conditions shown in Tables 2 and 3, and then the hard layer surface of the cutting edge portion is coated with the present coated tool 1 to 1. The Al ₂ O ₃ layer is exposed by blasting under the same conditions as in No. 18, or the Al ₂ O ₃ layer is exposed by polishing with a rubber grindstone, and the outer layer in the region other than the cutting edge is a ZrN layer The layer structure shown in Table 5 composed of a ZrCN layer or a ZrC layer, the target total (average) layer thickness (however, the layer thickness of the region other than the cutting edge portion) and the surface roughness (however, the surface roughness is the Comparative coated tools 10 to 18 (layer structure corresponding to the conventional coated tool 2) of the surface roughness of the Al ₂ O ₃ layer exposed to the blade portion were manufactured.

  Further, for the above-described inventive coated tools 1-18 and comparative coated tools 1-18, the constituent layers of these hard coating layers were observed using an Auger spectroscopic analyzer (observation of the longitudinal section of the layers). And the thickness of the constituent layer of the hard coating layer of these coated tools was measured using a scanning electron microscope (same longitudinal section measurement). The average layer thickness (average value of 5-point measurement) substantially the same as the target layer thickness was shown.

First, turning process evaluation was implemented by the following cutting conditions A and B about said this invention coated tool 1-5, 10-14 and comparative coated tool 1-5, 10-14.
[Cutting conditions A]
Work material: JIS / SUS304 lengthwise equally spaced 4 round bars with grooves,
Cutting speed: 300 m / min,
Incision: 2 mm,
Feed amount: 0.3 mm / rev. ,
Cutting time: 5 minutes,
Wet high-speed intermittent cutting test of stainless steel under the conditions (normal cutting speed is 200 m / min),
[Cutting conditions B]
Work material: JIS / SUH310, 4 longitudinally spaced round bars with equal intervals in the length direction,
Cutting speed: 250 m / min,
Cutting depth: 1.5 mm,
Feed amount: 0.2 mm / rev. ,
Cutting time: 5 minutes,
Wet high-speed intermittent cutting test of heat-resistant steel under the conditions (normal cutting speed is 150 m / min),

Next, milling process evaluation was implemented by the following cutting conditions C and D about said this invention coated tool 6-9, 15-18 and comparative coated tool 6-9, 15-18.
[Cutting conditions C]
Work material: Block material of JIS / SUS304,
Cutting speed: 250 m / min,
Incision: 2 mm,
Single blade feed amount: 0.20 mm / tooth,
Cutting time: 5 minutes,
Wet high-speed intermittent cutting test of stainless steel under the conditions (normal cutting speed is 150 m / min),
[Cutting conditions D]
Work material: Block material of JIS / SUH310,
Cutting speed: 250 m / min,
Cutting depth: 1.5 mm,
Single blade feed amount: 0.30 mm / tooth,
Cutting time: 5 minutes,
Wet high-speed intermittent cutting test of heat-resistant steel under the conditions (normal cutting speed is 200 m / min),
Then, the flank wear width of the cutting edge in each of the above cutting tests A to D was measured, and the measurement results are shown in Table 6.

  From the results shown in Tables 4-6, in the present invention coated tools 1-18, the innermost layer-inner layer-inner adhesion layer- so that the tensile residual stress gradually decreases from the innermost layer side toward the outer layer side. By forming a hard coating layer with a layer structure of intermediate layer-outer adhesion layer-outer layer, and applying blasting to the outer layer surface with excellent heat resistance, high temperature strength, and high temperature hardness, compressive stress is applied to the outer layer. By acting, and by suppressing the expansion of cooling cracks existing in the outer layer, and also suppressing the formation of excessive secondary cracks, it is accompanied by high heat generation and intermittent and impact on the cutting edge. Even in high-speed interrupted cutting of stainless steel, heat-resistant steel, etc., which has a heavy load, it exhibits excellent chipping resistance and exhibits excellent wear resistance over a long period of time, whereas from the innermost layer side to the outer layer side Toward the tensile residual stress Comparatively coated tools 1 to 9 having a layer structure that is not configured to gradually decrease, or a layer structure that is not configured to gradually decrease the tensile residual stress, as well as heat resistance, hardness, and strength to the cutting edge portion In the comparative coated tools 10-18, in which the ZrN layer, the ZrCN layer, and the ZrC layer, which are excellent in resistance, are not formed, they cannot withstand intermittent / impact high loads applied to the cutting edge under high temperature conditions during high-speed intermittent cutting. It is clear that chipping, chipping, and delamination occur in the hard coating layer, and this leads to a service life in a relatively short time.

  As described above, the coated tool of the present invention is not only cut under normal conditions such as various types of steel, stainless steel, and cast iron, and in particular, is accompanied by high heat generation and is intermittently applied to the cutting edge. It shows excellent chipping resistance even under high-speed intermittent cutting conditions such as stainless steel and heat-resistant steel that are subjected to shock loads, and exhibits excellent cutting performance over a long period of time. It can cope with labor saving, energy saving and cost reduction of processing sufficiently satisfactorily.

It is a general | schematic explanatory drawing which shows the distribution condition of the residual stress of the hard coating layer of this invention coating tool before performing a blast process. It is a schematic explanatory drawing which shows the distribution state of the residual stress of the hard coating layer of this invention coated tool after performing a blast process.

Claims (1)

In a surface-coated cutting tool in which a hard coating layer is deposited on the surface of a tool base composed of a tungsten carbide-based cemented carbide or a titanium carbonitride-based cermet,
(A) a titanium nitride layer having an average layer thickness of 0.1 to 0.5 μm as the innermost layer;
(B) As an inner layer,
Composition formula: Ti (C _X N _1-X )
X represents 0.2 to 0.5 (provided that the atomic ratio), and a titanium carbonitride layer having an average layer thickness of 1 to 3 μm,
(C) As an adhesion layer between the inner layer and the intermediate layer, an inner adhesion layer having a total average layer thickness of 0.1 to 1 μm and comprising one or more of a titanium carbonate layer or a titanium carbonitride oxide layer,
(D) an α-type aluminum oxide layer having an average layer thickness of 1 to 5 μm as an intermediate layer;
(E) As an adhesion layer between the intermediate layer and the outer layer, an outer adhesion layer having a total average layer thickness of 0.1 to 1 μm and comprising one or more of a titanium carbonate layer or a titanium carbonitride oxide layer,
(F) The outer layer has a total average layer thickness of 3 to 10 μm, and is a single layer or two or more layers made of any one of a zirconium nitride layer, a zirconium carbonitride layer, and a zirconium carbide layer A multi-layer consisting of a combination of
A surface-coated cutting tool in which a dry or wet blast is applied to the surface of a hard coating layer composed of the layers (a) to (f).

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