JP4853612B2 - Manufacturing method of cutting throwaway tip made of surface coated cermet whose hard coating layer exhibits excellent chipping resistance in high speed cutting - Google Patents

Description

The present invention is a surface-coated cermet cutting throwaway tip (hereinafter referred to as a coated cutting tip) that exhibits excellent chipping resistance with a hard coating layer, particularly when used for high-speed cutting of various steels and cast irons. It relates to a manufacturing method .

Conventionally, generally, as shown in a schematic perspective view in FIG. 3, it is composed of a tungsten carbide (hereinafter referred to as WC) -based cemented carbide or titanium carbonitride (hereinafter referred to as TiCN) -based cermet, and a tool at the center. On the entire surface of the rake face and the flank face including the cutting edge ridge line portion of the base body (hereinafter collectively referred to as a chip base body) having mounting holes,
(A-1) As a lower layer, a titanium carbide (hereinafter referred to as TiC) layer, a titanium nitride (hereinafter also referred to as TiN) layer, a titanium carbonitride (hereinafter referred to as TiCN) layer, a titanium carbonate (hereinafter referred to as "TiN"). A Ti compound layer composed of one or more of a layer represented by TiCO) and a titanium carbonitride oxide (hereinafter represented by TiCNO) layer and having an overall average layer thickness of 3 to 20 μm,
(A-2) As an upper layer, an aluminum oxide layer (hereinafter referred to as an α-type Al ₂ O ₃ layer) having an average layer thickness of 1 to 15 μm and having an α-type crystal structure in a state of chemical vapor deposition,
A coated cutting tip formed by chemical vapor deposition of the hard coating layer composed of (a-1) and (a-2) is known, and this coated cutting tip is a continuous material such as various steels and cast irons. It is well known that it is used for cutting and intermittent cutting.

In the above-mentioned coated cutting tip, the constituent layer of the hard coating layer generally has a granular crystal structure, and the TiCN layer constituting the Ti compound layer as the lower layer is intended to improve the strength of the layer itself. In a normal chemical vapor deposition apparatus, a gas mixture containing organic carbonitrides is used as a reaction gas, and it is formed by chemical vapor deposition at an intermediate temperature range of 700 to 950 ° C. so that it has a vertically grown crystal structure. It is also known to do.
Furthermore, it is also known that the surface of the α-type Al ₂ O ₃ layer (upper layer) constituting the hard coating layer of the above-described coated cutting tip is smoothed by wet blasting for the purpose of improving cutting performance. Yes.
Japanese Unexamined Patent Publication No. 6-31503 Japanese Patent Laid-Open No. 6-8010 JP-A-8-276305

In recent years, the performance of cutting equipment has been remarkable. On the other hand, there is a strong demand for labor saving and energy saving and further cost reduction for cutting, and along with this, cutting tends to be faster. The cutting tip has no problem when it is used for continuous cutting or intermittent cutting under normal conditions such as steel or cast iron, but the cutting speed is 350 m / min. When it is used for cutting at a high speed exceeding 1, the α-type Al ₂ O ₃ layer constituting the upper layer of the hard coating layer is likely to chip (small chipping), and as a result, in a relatively short time. At present, the service life is reached.

The present inventors have, from the viewpoint as described above, focuses on coated cutting tip α type the Al ₂ O ₃ layer described above constituting the upper layer of the hard coating layer, in particular the α-type the Al ₂ O ₃ layer As a result of research to improve chipping resistance of
(A) On the surface of the α-type Al ₂ O ₃ layer constituting the upper layer of the hard coating layer in the above-mentioned conventional coated cutting chip, the ratio of the wet blasting material to the total amount of water as a spraying abrasive is 15 When the polishing liquid containing -60 mass% aluminum oxide fine particles (hereinafter referred to as Al ₂ O ₃ fine particles) is sprayed and polished, the α-type Al ₂ O ₃ layer conforms to the compliant standard JIS B0601-1994. Based on the measurement (the following surface roughness is a measured value based on such a standard), the surface roughness of Ra: 0.3 to 0.6 μm is exhibited. Even when a coated cutting tip in which the surface of the Al ₂ O ₃ layer is smoothed to a surface roughness of Ra: 0.3 to 0.6 μm by wet blasting, the cutting speed is 350 m / min. High-speed cutting that exceeds the limit cannot effectively suppress chipping at the cutting edge.

(B) On the other hand, as shown in the schematic perspective view of FIG. 2, the rake face and clearance including the cutting edge ridge line portion of the α-type Al ₂ O ₃ layer constituting the upper layer of the hard coating layer in the conventional coated cutting tip described above. On the entire surface,
(B-1) First, as the lower layer, the reaction gas composition is in volume%,
TiCl ₄ : 0.2 to 10%,
CO ₂ : 0.1 to 10%,
Ar: 5 to 60%,
H ₂ : Remaining
And
Reaction atmosphere temperature: 800-1100 ° C.
Reaction atmosphere pressure: 4 to 70 kPa (30 to 525 torr),
And having an average layer thickness of 0.1 to 3 μm and a ratio of oxygen to Ti of 1.25 to 1.90 as measured by an Auger spectrometer,
Composition formula: TiO _W ,
In the case of
W: 1.25 to 1.90 in atomic ratio,
A titanium oxide layer ( hereinafter referred to as a TiO _W layer ) that satisfies the following conditions:
(B-2) Next, on the TiO _W layer (lower layer), as an upper layer, normal conditions, that is, the reaction gas composition in volume%,
TiCl ₄ : 0.2 to 10%,
N ₂ : 4-60%,
H ₂ : Remaining
And
Reaction atmosphere temperature: 800-1100 ° C.
Reaction atmosphere pressure: 4 to 90 kPa (30 to 675 torr),
When a TiN layer having an average layer thickness of 0.05 to 2 μm is formed under the conditions described above,
(B-3) When forming the TiN layer (upper layer), oxygen in the TiO _W layer constituting the lower layer is diffused so that the upper layer (TiN layer) is composed of a titanium oxynitride layer. However, in this case, the lower layer after the formation of the upper layer (the titanium oxynitride layer) is measured by an Auger spectroscopic analyzer at the center in the thickness direction, and the oxygen ratio is 1. 2 to 1.7, ie
Composition formula: TiO _x ,
In the case of
X: 1.2 to 1.7 in atomic ratio,
And a titanium oxide layer ( hereinafter referred to as a TiO _x layer ) satisfying
(B-4) Further, the upper layer composed of the above titanium oxynitride layer was also measured at the center in the thickness direction with an Auger spectroscopic analyzer, and the proportion of diffused oxygen was 0 in terms of atomic ratio with respect to nitrogen (N). .01-0.4, i.e.
Composition formula: TiN _1-Y (O) _Y ,
(Where (O) indicates diffused oxygen from the lower layer during upper layer deposition formation),
Y: 0.01 to 0.4 in atomic ratio
A titanium oxynitride layer ( hereinafter referred to as a TiN (O) layer) satisfying

(C) With the TiN (O) layer (upper layer) and the TiO _x layer (lower layer) formed by vapor deposition,
When a polishing liquid containing 15 to 60% by mass of Al ₂ O ₃ fine particles as a spraying abrasive in a ratio to the total amount of water is sprayed by wet blasting as in (a) above, the TiN (O ) Layer and TiO _x layer are pulverized and pulverized by the Al ₂ O ₃ fine particles, become pulverized TiN (O) particles and pulverized TiO _X fine particles, and act as an abrasive in the presence of the Al ₂ O ₃ fine particles. results in polishing the surface of the hard layer α type the Al ₂ O ₃ layer constituting the upper layer of the α-type the Al ₂ O ₃ layer surface after the results polishing, Ra: 0.2 [mu] m following The surface of the α-type Al ₂ O ₃ layer, which is the upper layer, is smoothed to a surface roughness, using a coated cutting tip in which the surface is smoothed to a surface roughness of Ra: 0.2 μm or less. When cutting, 350 m / min. Chipping at the cutting edge is prevented even at a cutting speed exceeding 1, and the hard coating layer exhibits excellent wear resistance over a long period of time.

(D) As described above, the cutting speed is 350 m / min. In high-speed cutting processing exceeding 1, the load applied to the cutting edge of the coated cutting tip is extremely high. Therefore, especially in the case of milling, the coated cutting tip is attached to the tool body with a very high clamping force. As a result, the compressive stress on the hard coating layer around the tool mounting hole of the coated cutting tip becomes extremely high. In particular, the α-type Al ₂ O ₃ layer constituting the upper layer has a Vickers hardness. In combination with having a high hardness of about 3000 at the height (Hv), cracks are likely to occur in this, and this causes peeling and chipping in the hard coating layer. As shown in the perspective view, when the wet blasting is performed, the peripheral portion of the tool mounting hole is not polished and the abrasive layer of this portion is left. The TiN (O) layer (upper layer) and the TiO _x layer (lower layer) constituting the layers are both relatively low in Hv: about 2000 in hardness as compared with the α-type Al ₂ O ₃ layer. Therefore, when attaching the coated cutting tip to the tool body, it acts as a buffer layer with a high clamping force, and as a result, the compressive stress on the α-type Al ₂ O ₃ layer becomes extremely small. Preventing the occurrence of cracks that cause peeling and chipping.
The research results shown in (a) to (d) above were obtained.

This invention was made based on the above research results,
( 1 ) It is composed of a WC-based cemented carbide or a TiCN-based cermet and has a cutting edge ridge line portion of a chip base having a tool attachment hole in the center, and the entire rake face and flank face.
(A-1) As a lower layer, a Ti compound layer composed of one or more of a TiC layer, a TiN layer, a TiCN layer, a TiCO layer, and a TiCNO layer and having an overall average layer thickness of 3 to 20 μm ,
(A-2) α-type Al ₂ O ₃ layer having an average layer thickness of 1 to 15 μm as an upper layer,
Chemical vapor deposition of the hard coating layer composed of (a-1) and (a-2) above,
(2) On the entire surface of the α-type Al ₂ O ₃ layer, which is the upper layer of the hard coating layer,
(B-1) The lower layer has an average layer thickness of 0.1 to 3 μm, and
Composition formula: TiO _x ,
, Measure the central part in the thickness direction with an Auger spectrometer,
X: 1.2 to 1.7 in atomic ratio,
TiO _x layer satisfying
(B-2) The upper layer has an average layer thickness of 0.05 to 2 μm, and
Composition formula: TiN _1-Y (O) _Y ,
(However, (O) indicates the diffused oxygen from the lower layer at the time of vapor deposition formation of the upper layer), the central portion in the thickness direction is also measured with an Auger spectrometer,
Y: 0.01 to 0.4 in atomic ratio
A TiN (O) layer satisfying
Abrasive material layer composed of (b-1) and (b-2) above is formed by chemical vapor deposition,
( 3 ) Next , with wet blasting, a polishing liquid containing 15 to 60% by mass of Al ₂ O ₃ fine particles as a spraying abrasive in a proportion of the total amount with water is sprayed.
In this case, the abrasive layer around the tool mounting hole is not polished, and remains as a buffer layer having a high clamping force when the tool body is mounted, and the abrasive layer on the remaining polishing surface is a jet abrasive. in the presence of the Al ₂ O ₃ pulverization TiN grinding of particulate lower layer formed by grinding atomized by injection of TiO _X fine and the upper layer (O) fine, and Al ₂ O ₃ fine as injection abrasive The surface of the α-type Al ₂ O ₃ layer constituting the upper layer of the hard coating layer is polished, and the rake face and the flank face including the cutting edge ridge line portion of the α-type Al ₂ O ₃ layer as the upper layer are polished. Characterized by the method of manufacturing coated cutting tips whose surface roughness is measured in accordance with JIS B0601-1994, Ra: 0.2 μm or less, and the hard coating layer exhibits excellent chipping resistance in high-speed cutting. It is what has.

The reason why the hard coating layer, the abrasive layer, and the Al ₂ O ₃ fine particles of the polishing liquid used in wet blasting in the manufacturing method of the coated cutting chip of the present invention are numerically limited as described above will be described below.
(A) Hard coating layer (a-1) Ti compound layer of lower layer The Ti compound layer exists as a lower layer of the α-type Al ₂ O ₃ layer, and the hard coating layer has a high temperature due to its excellent high temperature strength. In addition to contributing to strength improvement, it has a function of firmly adhering to both the chip base and the α-type Al ₂ O ₃ layer, thereby improving the adhesion of the hard coating layer to the chip base, but the overall average layer thickness is If the thickness is less than 3 μm, the above-mentioned effect cannot be sufficiently exerted. On the other hand, if the total average layer thickness exceeds 20 μm, it becomes easy to cause thermoplastic deformation particularly in high-speed cutting accompanied by generation of high heat. Since it becomes a cause, the whole average layer thickness was set to 3-20 micrometers.

(A-2) α-type Al ₂ O ₃ layer of the upper layer The α-type Al ₂ O ₃ layer has excellent high-temperature hardness and heat resistance, and contributes to improving the cutting performance of the coated cutting tip. If the average layer thickness is less than 1 μm, the desired excellent cutting performance cannot be exhibited over a long period of time. On the other hand, if the average layer thickness exceeds 15 μm, chipping tends to occur. The average layer thickness was set to 1 to 15 μm.

(B) Abrasive material layer As described above, the TiN (O) layer constituting the upper layer is a TiO _W layer having an oxygen ratio of 1.25 to 1.90 (W value) in terms of atomic ratio to Ti. Formed, and then deposited on the TiO _W layer by depositing a TiN layer under normal conditions. Therefore, diffusion of oxygen from the TiO _W layer during the TiN layer formation is indispensable. However, if the W value of the TiO _W layer is less than 1.25, the diffusion reaction of oxygen into the TiN layer is abruptly reduced, and the ratio (Y value) of the diffused oxygen in the upper layer is reduced to 0. On the other hand, if the same W value exceeds 1.90, the proportion of diffused oxygen (Y value) in the upper layer increases by more than 0.40 in atomic ratio. W value is determined as 1.25 to 1.90. In this case Side layer after formation lower layer of the proportion of oxygen in the (TiO _X layer) (X value) will take a value within a range of 1.2 to 1.7 in atomic ratio, after the upper layer formed in other words When the X value of the lower layer satisfies 1.2 to 1.7, the Y value of the upper layer satisfies 0.01 to 0.40.
In this case, the X value of the lower layer and the Y value of the upper layer are set to 1.2 to 1.7 and 0.01 to 0.40, respectively. It is obtained from many test results that these abrasive layers are pulverized and atomized in a suitable state at the time of wet blasting, and exhibit an excellent polishing function sufficiently. Based on this. Therefore, if the X value and Y value are out of the range of 1.2 to 1.7 and 0.01 to 0.40, respectively, the pulverization and atomization at the time of wet blasting of the abrasive layer is not satisfactorily performed, which is excellent. The polishing function cannot be expected.
Further, the average layer thicknesses of the upper layer and the lower layer were set to 0.05 to 2 μm and 0.1 to 3 μm, respectively, when the average layer thickness was less than 0.05 μm and less than 0.1 μm. The ratio of the pulverized TiO _x fine particles in the lower layer and the fine pulverized TiN (O) fine particles in the upper layer is too small to sufficiently exhibit the polishing function, while the average layer thickness is 2 μm and Even if the thickness exceeds 3 μm, the polishing function suddenly decreases. In any case, the surface of the α-type Al ₂ O ₃ layer cannot be polished to a surface roughness of Ra: 0.2 μm or less. It is based on.

(C) The Al ₂ O ₃ fine of Al ₂ O ₃ fine fraction polishing liquid of the polishing liquid, pulverization of TiN milled TiO _X fine and the upper layer of the lower layer of the abrasive layer during wet blasting ( O) The surface of the α-type Al ₂ O ₃ layer is polished in the state of coexisting with fine particles, but the proportion of the total amount with water is less than 15% by mass or more than 60% by mass. However, since the polishing function is abruptly lowered, the ratio is determined to be 15 to 60% by mass.

In the coated cutting tip manufactured by the method of the present invention, the rake face and flank face including the cutting edge ridge line portion of the α-type Al ₂ O ₃ layer constituting the upper layer of the hard coating layer have a Ra of 0.2 μm or less. Since the abrasive layer polished to the surface roughness and present in the periphery of the tool mounting hole acts as a buffer layer with a high clamping force, which is indispensable in high-speed cutting when attaching the coated cutting tip to the tool body, Combined with the fact that the compressive stress on the α-type Al ₂ O ₃ layer is remarkably small and, as a result, cracking that causes peeling and chipping is prevented, various steels, cast irons, etc. Cutting is performed at a cutting speed of 350 m / min. Even when used for high-speed operation exceeding the above, excellent chipping resistance is exhibited, and the service life can be further extended.

Next, the method for producing a coated cutting tip according to the present invention will be specifically described with reference to examples.

WC powder, TiC powder, ZrC powder, VC powder, TaC powder, NbC powder, Cr ₃ C ₂ powder, TiN powder, TaN powder, and Co powder all having an average particle diameter of 1 to 3 μm are prepared as raw material powders. These raw material powders were blended into the composition shown in Table 1, added with wax, ball milled in acetone for 24 hours, dried under reduced pressure, and pressed into a green compact with a predetermined shape at a pressure of 98 MPa. The green compact was vacuum sintered at a predetermined temperature in the range of 1370 to 1470 ° C. for 1 hour in a vacuum of 5 Pa. After sintering, the cutting edge portion was R: 0.07 mm honing By processing, chip bases A to F made of a WC-based cemented carbide having a throwaway tip shape defined in ISO · CNMG120408 were manufactured.

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 powder, all 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 pressed into a compact at a pressure of 98 MPa. The green compact was sintered in a nitrogen atmosphere of 1.3 kPa at a temperature of 1540 ° C. for 1 hour, and after the sintering, the cutting edge portion was subjected to a honing process of R: 0.07 mm. TiCN base cermet chip bases a to f having a standard / CNMG12041 chip shape were formed.

Next, each of these chip bases A to F and chip bases a to f is charged into a normal chemical vapor deposition apparatus,
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 No. 6-8010, and other than that, a normal granular crystal structure is shown. The Ti compound layer and α-type Al ₂ O ₃ layer having the target layer thicknesses shown in Table 6 are vapor-deposited as the lower layer and the upper layer of the hard coating layer under the conditions shown in FIG. (See Fig. 3)
Next, after forming the lower layer forming TiO _W layer [any of TiO _W (1) to (6)] under the conditions shown in Table 4, the upper layer forming titanium nitride layer (TiN layer) ) Under the same conditions as shown in Table 3, and with the target layer thickness shown in Table 6, the composition shown in Table 6, that is, the central portion in the thickness direction was measured with an Auger spectroscopic analyzer. Forming an abrasive layer composed of a lower layer and an upper layer of the X and Y values shown in FIG. 6 (see FIG. 2);
Subsequently, the coated cutting tip for forming the abrasive layer composed of the lower layer and the upper layer was subjected to wet blasting under the blasting conditions shown in Table 5 and in the combinations shown in Table 6, and the periphery of the tool mounting hole The rake face and flank face including the cutting edge ridge line part of the α-type Al ₂ O ₃ layer (upper layer) are polished to the surface roughness shown in Table 6 in the state where the abrasive layer is present in the part. Thus, the coated cutting chips 1 to 13 of the present invention were respectively manufactured (see FIG. 1).

For comparison purposes, as shown in Table 7, conventionally coated cutting chips 1 to 13 were produced under the same conditions except that the abrasive layer composed of the lower layer and the upper layer was not formed.
Table 7 shows the surface roughness after wet blasting of the α-type Al ₂ O ₃ layer constituting the hard coating layer of the conventional coated cutting chips 1 to 13 obtained as a result.

  Moreover, when the thickness of the constituent layer of the hard coating layer of the present invention coated cutting chips 1 to 13 and the conventional coated cutting chips 1 to 13 was measured using a scanning electron microscope (longitudinal cross section measurement), both were targets. The average layer thickness (average value of 5-point measurement) substantially the same as the layer thickness was shown.

Next, for the various coated cutting chips of the present invention coated cutting chips 1 to 13 and the conventional coated cutting chips 1 to 13 described above, all of them are screwed to the tip of the tool steel tool with a fixing jig,
Work material: JIS / FC300 round bar,
Cutting speed: 500 m / min,
Cutting depth: 2mm,
Feed: 0.35mm / rev,
Cutting time: 15 minutes,
A dry continuous high-speed cutting test (normal cutting speed is 250 m / min) of cast iron under the above conditions (referred to as cutting conditions A),
Work material: JIS · S45C lengthwise equal 4 round grooved round bars,
Cutting speed: 450 m / min,
Incision: 1.5mm,
Feed: 0.3mm / rev,
Cutting time: 10 minutes,
Dry intermittent high speed cutting test (normal cutting speed is 200 m / min) of carbon steel under the above conditions (referred to as cutting conditions B),
Work material: JIS / SCM440 round bar,
Cutting speed: 400 m / min,
Incision: 1.5mm,
Feed: 0.4mm / rev,
Cutting time: 8 minutes
The dry continuous high-speed cutting test (normal cutting speed is 200 m / min) of the alloy steel under the above conditions (referred to as cutting condition C) was performed, and the flank wear width of the cutting edge was measured in any cutting test. The measurement results are shown in Table 8.

From the results shown in Tables 6 to 8, all of the coated cutting tips 1 to 13 of the present invention manufactured by the method of the present invention are cutting edge ridge lines of α-type Al ₂ O ₃ layer constituting the upper layer of the hard coating layer. The rake face and the flank face including the portion are polished to a surface roughness of Ra: 0.2 μm or less, and the abrasive layer existing around the tool attachment hole is 350 m when attaching the coated cutting tip to the tool body. Acts as a buffer layer with a high clamping force, which is indispensable for high-speed cutting exceeding / min, preventing cracking that causes peeling and chipping, and excellent chipping resistance in high-speed cutting of steel and cast iron The surface roughness of the α-type Al ₂ O ₃ layer constituting the upper layer of the hard coating layer is Ra: 0.3 to 0.6 μm, while exhibiting excellent cutting performance over a long period of time Conventional coating cutting In the chip 1 to 13, either in the high-speed cutting of over 350 meters / min, I coupled with the fact that require high clamping force to the tool mounting, chipping occurs in the α-type the Al ₂ O ₃ layer, It is clear that the service life is reached in a relatively short time.

As described above, the coated cutting tip manufactured by the method of the present invention is not only continuous cutting and interrupted cutting under normal conditions such as various steels and cast iron, but particularly high speed exceeding 350 m / min. It exhibits excellent chipping resistance even when it is carried out at high temperatures, and exhibits excellent cutting performance over a long period of time. Therefore, it is possible to improve the performance of the cutting device, reduce the labor and energy of cutting, and reduce the cost. It can respond satisfactorily.

It is the schematic perspective view which notched and showed a part of hard coating layer of the coated cutting chip manufactured by the method of this invention. It is the schematic perspective view which notched and showed a part of abrasive material layer of the covering cutting chip after the abrasive material layer vapor deposition formation in the method of this invention. It is the schematic perspective view which notched and showed a part of hard coating layer of the conventional coated cutting chip.

Claims (1)

(1) The rake face and the flank face including the cutting edge ridge line portion of the tip base body, which is made of tungsten carbide base cemented carbide or titanium carbonitride base cermet and has a tool mounting hole in the center,
(A-1) The lower layer is composed of one or more of a titanium carbide layer, a titanium nitride layer, a titanium carbonitride layer, a titanium carbonate layer, and a titanium carbonitride oxide layer, and has a thickness of 3 to 20 μm. A Ti compound layer having an overall average layer thickness,
(A-2) As an upper layer, an aluminum oxide layer having an average layer thickness of 1 to 15 μm and having an α-type crystal structure in a state of chemical vapor deposition,
Chemical vapor deposition of the hard coating layer composed of (a-1) and (a-2) above,
( 2 ) On the entire surface of the aluminum oxide layer that is the upper layer of the hard coating layer,
(B-1) The lower layer has an average layer thickness of 0.1 to 3 μm, and
Composition formula: TiO _x ,
, The central part in the thickness direction is measured with an Auger spectrometer, and the atomic ratio is
X: 1.2 to 1.7,
Satisfying titanium oxide layer,
(B-2) The upper layer has an average layer thickness of 0.05 to 2 μm, and
Composition formula: TiN _1-Y (O) _Y ,
(However, (O) indicates the diffused oxygen from the titanium oxide layer, which is the lower layer when the upper layer is formed by vapor deposition). Similarly, the central portion in the thickness direction is measured with an Auger spectrometer. , Also in atomic ratio,
Y: 0.01 to 0.4
Satisfying titanium oxynitride layer,
Abrasive material layer composed of (b-1) and (b-2) above is formed by chemical vapor deposition,
( 3 ) In wet blasting, a polishing liquid containing 15 to 60% by mass of aluminum oxide fine particles in a proportion of the total amount with water is sprayed as a spray abrasive.
In this case, the abrasive layer around the tool mounting hole is not polished, and remains as a buffer layer having a high clamping force when the tool body is mounted, and the abrasive layer on the remaining polishing surface is a jet abrasive. The above hard coating layer in the coexistence of pulverized titanium oxide particles in the lower layer and pulverized titanium oxynitride particles in the upper layer formed by spraying aluminum oxide particles and aluminum oxide particles as the spray abrasive The surface of the aluminum oxide layer constituting the upper layer is polished, and the surface roughness of the rake face and the flank face including the cutting edge ridge line portion of the aluminum oxide layer, which is the upper layer, is based on the compliant standard JIS B0601-1994. The surface coating cermet with a hard coating layer exhibiting excellent chipping resistance in high-speed cutting processing, characterized in that Ra: 0.2 μm or less. Ltd. cutting throw-away chip manufacturing method.

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