JP2003019604A - Surface coated cemented carbide cutting tool having hard coating layer with excellent heat radiation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool having a hard coated layer with excellent heat radiation. SOLUTION: The surface coated cemented carbide cutting tool performs the physical vapor deposition of the hard coating layer comprising (a) a lower layer comprising either or both of a Ti-Al compound nitride layers and a Ti-Al compound carbonitride layer which satisfies X: 0.30-0.70 m: 0.6-0.99 in terms of the atomic ratio by the measurement of an Auger spectroscopic analyzer at a center of the thickness direction when expressed by the composition formula: [Ti1- XAlX]N and [Ti1- XAlX]C1-m Nm , and having a mean layer thickness of 0.5-15 μm, and (b) an upper layer comprising an aluminum nitride layer and having a mean layer thickness of 0.5-15 μm, on a surface of a tool base body formed of tungsten carbide based cemented carbide or carbonitride titanium based cermet.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to the generation of high heat
Excellent heat dissipation with hard coating layer due to high speed cutting of accompanying steel etc.
To prevent wear progress due to overheating.
Surface coated cemented carbide that can extend the service life of the step
Metal tools (hereinafter referred to as coated carbide tools)
is there. [0002] 2. Description of the Related Art Generally, cutting tools include various types of steel and cast iron.
For turning or planing of work materials such as
Throw-away heads that are detachably attached to
And drills used for drilling and cutting the work material.
Tools and miniature drills, as well as face milling of the work material
Solid type end used for groove processing, shoulder processing, etc.
Domill, etc.
Removably attached to the solid type end mill
Similarly, a slow-away end mill tool that performs cutting
Which is known. In general, for example, FIG.
Arc ion play, one of the physical vapor deposition devices shown
Using a heating device, heater
Is 1.3 × 10^-3At a temperature of 600 ° C as a vacuum of Pa
In a heated state, an anode electrode and a T
a cathode electrode (evaporation source) on which an i-Al alloy is set;
An arc discharge is generated during
Nitrogen gas, or methane gas and nitrogen gas
Introduced, on the other hand, tungsten carbide (hereinafter referred to as WC) group
Cemented carbide or titanium carbonitride (hereinafter referred to as TiCN)
A base cermet, and said anode electrode and
A tool base opposed to the sword electrode at a predetermined interval
(Hereinafter, these are collectively referred to as a carbide substrate)
For example, under the condition that a bias voltage of -120 V is applied,
On the surface of a hard substrate, for example, JP-A-62-56565
As described in the above, a composite nitride of Ti and Al [hereinafter, referred to as
(Ti, Al) N] layer and composite carbonitride [hereinafter
Below, denoted by (Ti, Al) CN]
Alternatively, a hard coating layer composed of
Coating produced by physical vapor deposition with an average layer thickness of m
Carbide tools are known. [0004] On the other hand, cutting in recent years
Need to save labor and energy and reduce costs
There is a strong demand, and with this, the cutting process has improved the performance of the cutting machine
In conjunction with this, there is a tendency to increase the speed, but
For hard tools, this can be done under normal conditions such as steel or cast iron.
There is no problem when used for cutting of
When used under cutting conditions, high heat generated during cutting
In particular, the temperature of the hard coating layer rises,
The wear of the layers is further accelerated,
At present, the service life can be reached in an extremely short time. [0005] Means for Solving the Problems Accordingly, the present inventors have
Focusing on the above-mentioned conventional coated carbide tools from the above viewpoint
And suppresses the temperature rise of the hard coating layer, especially during high-speed cutting.
As a result of research to control the hardness of the conventional coated carbide tools,
(Ti, Al) N layer and (T
The (i, Al) CN layer is formed by a composition formula: [Ti_1-XAl_X] N and
And [Ti_1-XAl_X] C_1-mN_mWhen expressed as
The atomic ratio is measured by Auger spectroscopy
X: 0.30 to 0.70, m: 0.6 to 0.99
Satisfactory (Ti, Al) N layer and (Ti, Al) CN
After specifying the layer, formed as a lower layer of the hard coating layer,
Further, aluminum nitride (hereinafter referred to as A)
1N), the resulting hard coating layer
In the above, the excellent thermal conductivity of the AlN layer and
Comes with thermal stability, heat dissipation of hard coating layer
Performance is further improved and exposed to the high heat generated during high-speed cutting.
Even overheating of the hard coating layer itself is significantly suppressed, while
(Ti, Al) N layer and (Ti, Al) CN layer
The hard coating layer has both high hardness and excellent heat resistance
The coating formed by forming this hard coating layer
Hard tools are associated with high heat generation, especially in steel and cast iron.
Hard coating layer has excellent heat dissipation even when used for high-speed cutting
And the progress of wear due to its own overheating is suppressed,
Research results that wear resistance will be further improved
I got it. The present invention has been made based on the above research results.
Wherein the surface of the cemented carbide substrate has (a) a composition
Formula: [Ti_1-XAl_X] N and [Ti_1-XAl_X] C
_1-mN_mWhen expressed by, Auger spectroscopy at the center in the thickness direction
As measured by an analyzer, X: 0.30 to 0.
70, m: 0.6 to 0.99 (Ti, Al)
One of the N layer and the (Ti, Al) CN layer,
Or an average layer thickness of 0.5 to 15 μm
(B) made of AlN, and
An upper layer having an average layer thickness of 15 μm, above (a) and
A hard coating layer formed by physical vapor deposition of the hard coating layer configured in (b).
Features a coated carbide tool with a coating layer that exhibits excellent heat dissipation
It has. Next, the hard coating of the coated carbide tool of the present invention is described.
For the lower layer and upper layer that constitute the covering layer,
The reason for limiting the numerical values as follows will be described. (A) Lower layer (Ti, Al) N layer and (T
Al in the (i, Al) CN layer is TiN and TiCN
Increases high temperature hardness and heat resistance to abrasion resistance
To form a solid solution to improve
Formula: (Ti_1-XAl_X) N and (Ti_1-XAl_X) C
_1-mN_m, The X value of which is an atomic ratio (the same applies hereinafter),
Cannot achieve the desired abrasion resistance, while its value
Exceeds 0.7, chipping and chipping occur at the cutting edge
X value is 0.3-0.7 because it is easy to produce
I decided. Preferably, the X value should be 0.35 to 0.65.
Is good. In the above (Ti, Al) CN layer,
Since the C component has an effect of improving hardness, (T
The (i, Al) CN layer has a better phase than the (Ti, Al) N layer.
In contrast, it has a high hardness, but in this case,
Is less than 0.01, that is, the m value is 0.9.
If it exceeds 9, the predetermined hardness-improving effect cannot be obtained.
Min ratio exceeds 0.4, that is, m value is less than 0.6
, The toughness suddenly decreases.
The value was defined as 0.6-0.99. Desirably, the m value is set to 0.
It is good to be 8 to 0.9. In this case, the average thickness of the lower layer is 0.5
If it is less than μm, the desired excellent high-temperature hardness and heat resistance are assured.
Cannot be maintained, while its layer thickness exceeds 15 μm
Combined with the thickness of the upper layer described above,
The shape is more likely to occur, causing uneven wear of the cutting edge.
Service life is shortened.
The average layer thickness was determined to be 0.5 to 15 μm. (B) Upper layer The upper layer has excellent thermal conductivity as the hard coating layer as described above
And thermal stability, further improving heat dissipation
But the average layer thickness is less than 0.5 μm.
If it is full, the desired improvement effect cannot be obtained in the above-mentioned action, while
If the average layer thickness exceeds 15 μm, uneven wear occurs on the cutting edge.
That this will accelerate the progress of wear
Therefore, the average layer thickness was determined to be 0.5 to 15 μm. In addition,
A TiN layer is formed by vapor deposition on the upper layer as required.
This is because the TiN layer has a golden hue and
Easy to distinguish between before and after using cutting tools
In this case, the average layer thickness is
If the thickness is less than 0.1 μm, the color tone is insufficiently imparted.
On the other hand, the provision of the above color tone is sufficient if the average layer thickness is up to 2 μm.
For this reason, the average layer thickness is preferably 0.1 to 2 μm. [0011] BEST MODE FOR CARRYING OUT THE INVENTION Next, coated carbide cutting of the present invention
The tool will be specifically described with reference to examples. (Example 1) As raw material powders,
WC powder, TiC powder having a predetermined average particle size in the box,
ZrC powder, VC powder, TaC powder, NbC powder, Cr
_ThreeC _TwoPowder, TiN powder, TaN powder, and Co powder
Are prepared, and the raw material powders are mixed with the composition shown in Table 1.
And wet-mixed for 72 hours in a ball mill and dried.
Then, it is pressed into a green compact at a pressure of 100 MPa,
In vacuum of 6 Pa, temperature: 1400 ° C for 1 hour
Sinter under the condition of holding, and after sintering, R: 0.05
Honing process, ISO standard, CNMG120
Carbide base made of WC based cemented carbide with 408 tip shape
The bodies A1 to A10 were formed. In addition, as raw material powders,
TiCN having a predetermined average particle size in the range of 2 μm (weight
(TiC / TiN = 50/50 in quantitative ratio) Powder, Mo_TwoC powder
Powder, ZrC powder, NbC powder, TaC powder, WC powder,
Prepare Co powder and Ni powder,
Was blended in the composition shown in Table 2, and 2
After 4 hours of wet mixing and drying, at a pressure of 100 MPa
It is pressed into a green compact, and this green compact is
Sintering under the condition of keeping at 1500 ° C for 1 hour in an atmosphere
And after sintering, honing of R: 0.03 on the cutting edge
ISO standard, CNMG120408 chip type
Carbide Substrates B1 to B Made of TiCN Cermet
6 was formed. Next, these super-hard substrates A1 to A10 and
And B1 to B6 were ultrasonically cleaned in acetone and dried.
In the state, the normal arc ion respectively illustrated in FIG.
After charging into the plating equipment, the cathode electrode (evaporation
Source) with Ti-Al alloys having various component compositions.
1.3 × 10^-3Keep at Pa vacuum
While heating, the inside of the device was heated to 500 ° C with a heater.
Then, an Ar gas is introduced into the apparatus, and an Ar atmosphere of 2.5 Pa is introduced.
In this state, a bias voltage of -800 V is applied to the carbide substrate.
Ar gas bombarding cleaning of super-hard substrate surface by applying pressure
And then 3 × 10^-3While maintaining the vacuum of Pa,
A predetermined temperature within the range of 600 to 700 ° C with the heater
While heated to a temperature, the cathode electrode and the anode electrode
An arc discharge is generated between the electrodes and the reaction gas
And introduce nitrogen gas or methane gas and nitrogen gas.
The reaction atmosphere is 2.8 Pa and the cemented carbide substrate
By setting the bias voltage applied to
And that of the super-hard substrates A1 to A10 and B1 to B6
On each surface, the target composition and target shown in Tables 3 and 4
Thick hard coating layer (corresponds to the lower layer of the coated carbide tool of the present invention)
FIG. 2 (a) is a schematic perspective view
In the figure, it has the shape shown in the schematic longitudinal sectional view in FIG.
Conventional surface coated cemented carbide slot as conventional coated carbide tool
-Away tips (hereinafter referred to as conventional coated carbide tips)
1 to 22 were manufactured respectively. Then, these conventional coated carbide tips 1-2
2 is also applied to the surface of the arc ion
The cathode electrode (evaporation source)
1.3 × 10^-3P
a. While maintaining the vacuum of a, the heater
While heated to a predetermined temperature within the range of 700 ° C.,
Arc discharge occurs between the cathode and anode electrodes
And introduce nitrogen gas as a reaction gas
A pulse applied to the carbide substrate with a Pa reaction atmosphere
By setting the bias voltage to -280 V, as shown in Table 5,
The same by depositing the upper layer of the target layer thickness
The coated carbide tool of the present invention having the shape shown in FIG.
Of the present invention surface-coated cemented carbide throwaway tips
(Hereinafter referred to as coated carbide tips of the present invention)
Each was manufactured. It should be noted that various coated carbide chips obtained as a result are
The composition of the constituent layers of the hard coating layer
The layer thickness can be measured using an Auger spectrometer and a scanning electron microscope.
The target composition and eye in Tables 3 to 5 were measured using
Composition and average layer thickness substantially the same as the standard layer thickness (5 optional locations
(Mean value of measurement). Next, various coated carbides obtained as a result are obtained.
Among the chips, the coated carbide tips 1 to 16 of the present invention and
For the coated carbide tips 1-16, Work material: JIS S50C round bar, Cutting speed: 350 m / min. , Cut: 1.5 mm, Feed: 0.2 mm / rev. , Cutting time: 10 minutes, Under dry conditions (hereinafter referred to as cutting conditions a)
High-speed turning test, Work material: JIS / SNCM439 Four at regular intervals in the length direction
Flute round bar, Cutting speed: 300 m / min. , Cut: 2.0 mm, Feed: 0.3 mm / rev. , Cutting time: 5 minutes, Cutting of alloy steel under the conditions (hereinafter referred to as cutting conditions b)
High-speed turning test, Work material: JIS FC250 round bar, Cutting speed: 400 m / min. , Cut: 1.5 mm, Feed: 0.3 mm / rev. , Cutting time: 10 minutes, Dry casting of cast iron under the following conditions (hereinafter referred to as cutting conditions c)
A high-speed turning test is performed.
The surface wear width was measured. Further, the coated carbide tips 17 to 22 of the present invention are provided.
And for the conventional coated carbide tips 17-22, Work material: JIS SCM440 round bar, Cutting speed: 350 m / min. , Cut: 1.5 mm, Feed: 0.2 mm / rev. , Cutting time: 10 minutes, (Hereinafter referred to as cutting condition d)
High-speed turning test, Work material: JIS S45C with 4 longitudinal grooves at regular intervals in the length direction
Round bar, Cutting speed: 280 m / min. , Cut: 1.5 mm, Feed: 0.15 mm / rev. , Cutting time: 5 minutes, Dry cutting of carbon steel under the following conditions (hereinafter referred to as cutting conditions e)
High-speed turning test, Work material: JIS FC300 round bar, Cutting speed: 380 m / min. , Cut: 2mm, Feed: 0.2 mm / rev. , Cutting time: 10 minutes, Dry casting of cast iron under the following conditions (hereinafter referred to as cutting conditions f)
A high-speed turning test is performed.
The surface wear width was measured. Table 6 shows the measurement results. [0018] [Table 1][0019] [Table 2] [0020] [Table 3] [0021] [Table 4][0022] [Table 5] [0023] [Table 6](Example 2) As the raw material powder, the average particle size was as follows:
Medium coarse WC powder with 5.5 μm, fine with 0.8 μm
Granular WC powder, 1.3 μm TaC powder, 1.2 μm
NbC powder, 1.2 μm ZrC powder, 2.3 μm
m Cr_ThreeC_TwoPowder, 1.5 μm VC powder, 1.0 μm
μm of (Ti, W) C powder and 1.8 μm of Co
Powders are prepared, and these raw material powders are shown in Table 7 respectively.
And then add wax and acetone
After mixing in a ball mill for 24 hours and drying under reduced pressure,
Press molding into various compacts of specified shape at 0MPa pressure
Then, these green compacts are placed in a vacuum atmosphere of 6 Pa at 7 ° C. /
At a temperature rise rate of 1370-1470 ° C.
Temperature, hold at this temperature for 1 hour, and then
Sintered to 8mm, 13mm and 26mm diameter
Three kinds of round bar sintered bodies for forming a cemented carbide substrate were formed,
Table 7 shows the three types of round rod sintered bodies
The diameter x length of the cutting edge is 6mm x 1
3mm, 10mm x 22mm, and 20mm x 45m
4-flute square-shaped cemented carbide substrate with dimensions of
Domyl) a to h were produced respectively. Next, these carbide substrates (end mills)
The surfaces of a to h were ultrasonically cleaned in acetone and dried.
In the state, a normal arc ion pump also illustrated in FIG.
The same conditions as in Example 1 above were loaded into the rating device.
The hard coating having the target composition and the target layer thickness shown in Table 8
Layer (equivalent to the lower layer of the coated carbide tool of the present invention)
As a result, FIG. 3A is a schematic front view, and FIG.
Conventional coating having a shape shown in a schematic cross-sectional view of a cutting blade portion
Conventional surface-coated cemented carbide end mill as a cemented carbide tool
(Hereinafter referred to as conventional coated carbide end mills) 1 to 8
Each was manufactured. Furthermore, the above-mentioned conventional coated carbide end mill 1
The arc ion plating device on the surface of
At the same conditions as in Example 1 above, the eye shown in Table 9
FIG. 3 also shows that the upper layer having the standard thickness is formed by vapor deposition.
The present invention as a coated carbide tool of the present invention having the shape shown
Bright surface coated cemented carbide end mill
1-8, respectively. [0027] The various coated cemented carbide
The composition and composition of the constituent layers of the hard coating layer
Thickness and layer thickness using an Auger spectrometer and a scanning electron microscope.
When measured using a microscope, the target compositions and
Composition and average layer thickness substantially the same as
Comparison with the average of the measurements at three locations). Next, the coated carbide end mill 1 of the present invention will be described.
-8 and conventional coated carbide end mills 1-8
Bright coated carbide end mills 1-3 and conventional coated carbide end mills
For mills 1-3, Work material: Plane dimensions: 100 mm x 250 mm, thickness: 5
0mm JIS SCM440 plate, Cutting speed: 150 m / min. , Groove depth (cut): 3 mm Table feed: 500 mm / min, -Speed high-speed grooving test of alloy steel under the conditions of
Hard end mill 4 to 6 and conventional coated carbide end mill 4 to
About 6, Work material: Plane dimensions: 100 mm x 250 mm, thickness: 5
0mm JIS SKD61 (HRC52) plate, Cutting speed: 65 m / min. , Groove depth (cut): 0.5 mm Table feed: 120 mm / min, -Speed high-speed grooving test of tool steel under the conditions of
Hard end mills 7, 8 and conventional coated carbide end mills 7,
For 8, Work material: Plane dimensions: 100 mm x 250 mm, thickness: 5
0mm JIS FC300 plate material, Cutting speed: 160 m / min. , Groove depth (cut): 8 mm, Table feed: 240 mm / min, Dry iron grooving test of cast iron under the following conditions
In any high-speed grooving test, the flank wear of the outer peripheral edge
Cutting down to 0.1 mm, which is the standard of service life
The groove length was measured. The measurement results are shown in Tables 8 and 9, respectively.
did. [0029] [Table 7] [0030] [Table 8] [0031] [Table 9](Example 3)
Diameter 8 mm (for forming super hard substrates a to c), 13 mm (super hard
For forming substrates d to f) and 26 mm (carbide substrates g and h)
(For forming) three kinds of round bar sintered bodies
The diameter x length of the groove forming part is
4 mm x 13 mm (carbide substrate a 'to c'), 8 mm each
× 22 mm (carbide substrate d ′ to f ′) and 16 mm ×
Carbide base with dimensions of 45 mm (carbide substrate g ', h')
The bodies (drills) a 'to h' were respectively manufactured. Next, these carbide substrates (drills) a
The surface of '~ h' is ultrasonically cleaned in acetone and dried
In the state of the normal arc ion also illustrated in FIG.
The same material as in Example 1 was charged in the plating apparatus.
The hardness of the target composition and the target layer thickness shown in Table 10
Coating layer (equivalent to the lower layer of the coated carbide tool of the present invention) deposited
As a result, FIG.
(B) has a shape shown in a schematic cross-sectional view of the groove forming portion.
Of conventional surface coated cemented carbide as conventional coated carbide tool
Lil (hereinafter referred to as conventional coated carbide drill) 1 to 8
Each was manufactured. Further, the above-mentioned conventional coated carbide drills 1 to 8
On the surface, also in the arc ion plating system
Then, under the same conditions as in Example 1 above,
By vapor deposition forming the upper layer having the reference layer thickness, FIG.
As a coated carbide tool of the present invention having the shape shown in Fig.
Invented surface coated cemented carbide drill
1 to 8). Furthermore, various coated carbides obtained as a result are obtained.
For the drill, a set of constituent layers of the hard coating layer
The formation and layer thickness are determined by Auger spectroscopy
When measured using a scanning microscope, the targets in Tables 10 and 11
Composition and average layer thickness substantially equal to composition and target layer thickness
(Comparison with the average value of measurement at five arbitrary points) is shown. Next, the coated carbide drills of the present invention 1 to 8
And, among the conventional coated carbide drills 1 to 8, the coated
Hard drills 1-3 and conventional coated carbide drills 1-3
The Work material: plane dimensions: 100 mm x 250, thickness: 50 m
JIS S45C plate material, Rotation speed: 8000 min^-1, Feed: 1120 mm / min, High-speed drilling test of carbon steel under the conditions of
For coated carbide drills 4-6 and conventional coated carbide drills 4-6
About Work material: Plane dimensions: 100 mm x 250 mm, thickness: 5
0mm JIS / SNCM439 plate material, Rotation speed: 3800min^-1, Feed: 680 mm / min, High-speed drilling test of alloy steel under the conditions of
For coated carbide drills 7, 8 and conventional coated carbide drills 7, 8
About Work material: Plane dimensions: 100 mm x 250 mm, thickness: 5
0mm JIS FC250 plate material, Rotation speed: 1800min^-1, Feed: 480 mm / min, Wet high speed drilling test of cast iron under the conditions of each
Perform any wet (using water-soluble cutting oil) high-speed drilling
In the engineering test, the flank wear width of the tip cutting edge reaches 0.3 mm.
The number of drilling operations until completion was measured. Table 1 shows the measurement results.
0 and 11 respectively. [0037] [Table 10][0038] [Table 11] [0039] According to the results shown in Tables 3 to 114, the present invention
All bright coated carbide tools require high machining of steel and cast iron.
Excellent heat transfer in the upper layer even at high speeds with heat generation
Hard coating layer has excellent heat dissipation due to conductivity and thermal stability
The hard coating layer itself is not overheated
Therefore, the (Ti, Al) N layer and the (Ti,
Al) The excellent high hardness provided by the CN layer
Chipping, chipping, etc. due to loose heat resistance
And excellent wear resistance, but practically
The hard coating layer is the (Ti, Al) N layer and (Ti,
Al) In a conventional coated carbide tool comprising a CN layer,
The displacement of the hard coating layer is also caused by the high heat generated during high-speed cutting.
The temperature of the body rises, which significantly accelerates the progress of wear,
It is clear that the service life is reached in a relatively short time. Up
As described above, the coated carbide tool of the present invention can be used for various types of steel and casting.
Not only cutting under normal conditions such as iron
Demonstrates excellent wear resistance even in high speed cutting
Therefore, labor saving and energy saving of cutting process, and
It can sufficiently cope with cost reduction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view of an arc ion plating apparatus. FIG. 2A is a schematic perspective view of a coated carbide tip, and FIG.
1 is a schematic vertical sectional view of a coated carbide tip. FIG. 3 (a) is a schematic front view of a coated carbide end mill,
(B) is a schematic transverse sectional view of the cutting blade portion. FIG. 4A is a schematic front view of a coated carbide drill, and FIG.
FIG. 3 is a schematic cross-sectional view of the groove forming portion.

[Procedure amendment] [Date of submission] August 22, 2001 (2001.8.2
2) [Procedure amendment 1] [Document name to be amended] Description [Item name to be amended] 0039 [Correction method] Change [Content of amendment] [Effect of the Invention] From the results shown in Tables 3 to 14 , Inventive coated carbide tools, even when cutting steel or cast iron at high speed with high heat generation, the hard coating layer has excellent heat dissipation due to the excellent thermal conductivity and thermal stability of the upper layer. Since the hard coating layer itself does not overheat, the lower layer (Ti, Al) N layer and (Ti, A)
l) In combination with the excellent high hardness provided by the CN layer and the excellent heat resistance, it exhibits excellent wear resistance without occurrence of chipping, chipping, etc., whereas the substantially hard coating layer The (Ti, Al) N layer and (Ti, A
l) In the conventional coated cemented carbide tool comprising a CN layer, the temperature of the hard coating layer itself rises due to the high heat generated during high-speed cutting, which significantly accelerates the progress of wear and shortens the service life in a relatively short time. It is clear that it will lead. As described above, the coated carbide tool of the present invention exerts excellent wear resistance not only in cutting under various conditions such as steel and cast iron but also in high-speed cutting. Therefore, it is possible to satisfactorily cope with the labor saving and energy saving of the cutting process and the cost reduction.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Yusuke Tanaka             179 Kanegasaki Nishi-Oike, Uozumi-cho, Akashi-shi, Hyogo Prefecture             1 MMC Kobelcourt Co., Ltd.             Inside (72) Inventor Natsuki Ichinomiya             179 Kanegasaki Nishi-Oike, Uozumi-cho, Akashi-shi, Hyogo Prefecture             1 MMC Kobelcourt Co., Ltd.             Inside (72) Inventor Akihiro Kondo             179 Kanegasaki Nishi-Oike, Uozumi-cho, Akashi-shi, Hyogo Prefecture             1 MMC Kobelcourt Co., Ltd.             Inside F-term (reference) 3C037 CC02 CC04 CC09 CC11                 3C046 FF03 FF04 FF10 FF13 FF19                       FF25                 4K029 AA04 BA54 BA58 BC02 BC10                       BD05 EA01

Claims (1)

Claims: 1. A surface of a tool base composed of a tungsten carbide-based cemented carbide or a titanium carbonitride-based cermet, comprising: (a) a composition formula: [Ti _1-x Al _x ] N [Ti
_1-X Al _x ] C _1-m N _m , when measured by an Auger spectrometer at the center in the thickness direction, and expressed as X:
0.30 to 0.70, m: one or both of a composite nitride layer of Ti and Al and a composite carbonitride layer of Ti and Al satisfying 0.6 to 0.99, and (B) a lower layer having an average layer thickness of 0.5 to 15 μm;
A surface-coated cemented carbide cutting tool in which the hard coating layer exhibits excellent heat dissipation, obtained by physical vapor deposition of an upper layer having an average layer thickness of 5 μm and a hard coating layer composed of the above (a) and (b). .