JP3371823B2 - Surface coated cemented carbide cutting tool with excellent interlayer adhesion with hard coating layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a hard coating layer comprising
Ti compound layer to be formed, aluminum oxide (hereinafter referred to as Al_Two
O_Three ) Layer and dititanium trioxide (hereinafter referred to as Ti_Two
O_Three The main layers have excellent interlayer adhesion to each other.
And therefore used for high speed cutting of steel and cast iron, for example.
In this case, the hard coating layer does not peel off,
Surface-coated cemented carbide cutting tool that exhibits unusual cutting performance
(Hereinafter referred to as coated carbide tool). [0002] 2. Description of the Related Art Conventionally, generally, for example, Japanese Patent Application Laid-Open No. 6-315
No. 03, JP-A-6-316758, and
As described in Japanese Unexamined Patent Publication No. 7-216549,
Tungsten carbide-based cemented carbide substrate (hereinafter referred to as cemented carbide substrate)
A), an average layer thickness of 0.1 to 15 μm
Titanium carbide (hereinafter, referred to as TiC) layer, titanium nitride
Tan (hereinafter also referred to as TiN) layer, titanium carbonitride
(Hereinafter referred to as TiCN) layer, titanium carbonate (hereinafter referred to as T
iCO) layer, titanium oxynitride (hereinafter referred to as TiNO)
Layer and titanium carbonitride (hereinafter referred to as TiCNO)
B) a Ti compound comprising one or more of the layers
Layer and Al with an average layer thickness of 0.5 to 15 μm_Two O_Three
And a hard coating layer composed of layers having a total average of 3 to 25 μm.
Coating of chemical and / or physical vapor deposition at layer thickness
Hard tools are known, and this coated carbide tool is
It is also known to be used for continuous cutting and interrupted cutting of iron etc.
ing. Also, generally, the hard coating layer of the above-mentioned coated carbide tool is used.
Compound layer and Al_Two O_Three Layer is granular crystal
Having a structure and the Al_Two O_Three The layer has an α-type crystal structure
It is also good to have something with a κ-type crystal structure
It is well known, for example, Japanese Patent Laid-Open No. 6-8010
And Japanese Patent Application Laid-Open No. 7-328808.
A TiCN layer constituting the Ti compound layer,
In order to improve the toughness of
A mixed gas containing an organic carbonitride is used as the reaction gas.
By chemical vapor deposition at a medium temperature range of 00 to 950 ° C
Also formed to have a vertically grown crystal structure
Have been. Further, the Ti compound layer is similarly formed.
The TiCNO layer is formed using a normal chemical vapor deposition apparatus. Reaction gas composition: TiCl in volume%_Four : 0.5-3%,
CO: 0.1-1%, CH_Three CN: 0.1-1%, N
_Two : 5 to 30%, H_Two :remaining, Ambient temperature: 870-930 ° C, Atmospheric pressure: 30 to 200 Torr, The fine vertical growth crystal structure can be obtained by forming
It has also been proposed to have it. [0003] On the other hand, recent cutting devices
High-performance and high-power
There is also a strong demand for high-speed cutting.
In the conventional coated carbide tools described above,
Of the hard coating layer constituting_Two O_Three Layers, especially α-type
Al with crystal structure_Two O_Three Layer (hereinafter referred to as α-Al_Two O_Three Indicated by layer
Is excellent in oxidation resistance and thermal stability, and has high hardness
Interlayer adhesion with other constituent layers, Ti compound layer
Poor cutting performance, such as continuous cutting of steel or cast iron, etc.
When intermittent cutting is performed at high speed, the hard coating layer peels off.
Easy to produce, which leads to a relatively short service life
is the current situation. [0004] Means for Solving the Problems Accordingly, the present inventors have
From the viewpoint as described above, the hard coating layer of the coated carbide tool is formed.
Al formed_Two O_Three Layers, especially α-Al_Two O_Three Focus on layers,
The interlayer adhesion between this and the Ti compound layer as another constituent layer
As a result of research to improve, (1) The subject is Ti_Two O_Three Consisting of and other than oxygen (O)
Carbon (C) and nitrogen (N) as nonmetallic elements of
1 to 20 atoms in proportion to the total amount with O (oxygen)
% Ti_Two O_Three The main layer, that is, C and N are Ti_Two
O_Three Is the proportion of the total amount with O that forms
20 atomic%, the balance being substantially Ti_Two O_Three [A trace amount
Cl (chlorine) may be contained as an unavoidable impurity.
Ru]_Two O_Three The main layer is a Ti compound layer and
Al_Two O_Three Layers, especially α-Al_Two O_ThreeRemarkably strong with both layers
It has the property of firmly adhering, and contains C and N
The strength of the layer itself is also improved. (2) Ti_Two O_Three The main layer isChemical vapor depositionUsing
Reaction gas composition (% by volume, the same applies hereinafter)-TiCl_Four : 0.
5 to 10%, Ar: 1 to 30%, CO: 0.5 to 5%,
CO_Two : 0.5 to 10%, N_Two : 1 to 40%, H_Two : Remaining
And Ambient temperature: 800 to 1100 ° C, Atmospheric pressure: 30 to 500 Torr, It can be formed under the following conditions. (3) Therefore, the above Ti_Two O_Three The main layer is
The above formed using a deposition method and / or a physical vapor deposition method
Of Ti compound layer and Al constituting conventional hard coating layer_Two O_Three
Layer (especially α-Al_Two O_Three layer)Place betweenAnd the T
i-compound layer and Al_Two O_Three The layer is_Two O_Three The main layer is
It must have the property to adhere extremely strongly to both of these layers.
From this, it comes to have a high interlayer adhesion, therefore,
For example, delamination of hard coating layer occurs even in high-speed cutting of steel or cast iron
And show excellent cutting performance for a long time
Swell. The research results shown in (1) to (3) above were obtained.
You. [0005] The present invention has been made based on the above research results.
The surface of the super-hard substrate was all subjected to 0.1.
TiC layer, TiN having an average layer thickness of 1 to 15 μm
Layer, TiCN layer, TiCO layer, TiNO layer, and Ti
Ti compound comprising one or more of CNO layers
Object layer and Al having an average layer thickness of 0.5 to 15 μm_Two O
_Three Layers, especially α-Al_Two O_Three Layer, composed of a hard coating layer
With a total average layer thickness of 3 to 25 μm by chemical vapor deposition and / or
Is a surface coated cemented carbide cutting tool made by physical vapor deposition
hand,The Ti compound layer and the Al _Two O _Three Between layers,Chemistry
Deposited and formedHaving an average layer thickness of 0.1 to 5 μm,
Is Ti_Two O_Three And as a nonmetallic element other than O
C and N are 1 to 1 in the total amount with respect to the total amount of O and C.
Ti containing 20 atomic%_Two O_Three Main subject,Layered structure with
Be made, Hard coating layer has excellent interlayer adhesion
Surface coated cemented carbide cutting tools.
You. [0006] In the coated carbide tool of the present invention,
Ti constituting the hard coating layer_Two O_Three C and
And N have the effect of improving the strength of the layer itself,
If the content is less than 1 atomic% in the total amount with O,
The desired strength-improving effect is not obtained, while the content is the same
If it exceeds 20 atomic%, Ti_Two O_Three An excellent layer of
Since the adhesion will be impaired, the content
It was determined to be 1 to 20 atomic%. In this case, Ti_Two O_Three
The content ratio of C and N in the main layer depends on the amount of CO, C in the reaction gas.
O_Two , Ar, and N_Two By adjusting the content ratio of
And the mutual ratio of C and N is CO, CO
_Two , And N_Two Controlled by adjusting the mutual proportions of
However, both C and N have an equal effect on improving the strength of the layer itself.
Since it is effective, the total content is within a specified range of 1 to 20 atomic%.
If C is present, even if C is relatively larger than N,
However, even if C is smaller than N, the change in the strength improving effect is as follows.
Therefore, the total content of C and N was 1 to 20
It was child%. In addition, Ti_Two O_Three Flat of main subject
The average layer thickness is set to 0.1 to 5 μm because the thickness is 0.1 μm.
α-Al below μm_TwoO_ThreeLayer and Ti compound layer
The desired excellent interlayer adhesion can be secured between
On the other hand, if the thickness exceeds 5 μm,
Due to the fact that pinging (micro chipping) is likely to occur.
Things. Further, the coated carbide tool of the present invention
The Ti compound layer and Al constituting the hard coating layer_Two O
_Three The average layer thickness of the layers is 0.1 to 15 μm and 0.1 μm, respectively.
5 to 15 μm, and the total average thickness of the hard coating layer is 3
２５25 μm for any of these layer thicknesses
If the layer thickness is less than the lower limit, the desired wear resistance is obtained.
Cannot be secured, while any of these layer thicknesses
If the thickness exceeds the upper limit even with any of these layer thicknesses, the cutting edge may be chipped or chipped.
This is because pinging is likely to occur. [0008] DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a coated carbide tool of the present invention
Will be specifically described with reference to examples. As raw material powder,
Average particle size: Medium WC powder having 2.8 µm, 4.9 µm
m of coarse WC powder and 1.5 μm of (Ti, W) C (weight
The same in the following, TiC / WC = 30/70) powder,
1.2 μm (Ti, W) CN (TiC / TiN / W
C = 24/20/56) powder, 1.2 μm (Ta,
Nb) C (TaC / NbC = 90/10) powder;
2 μm Cr_ThreeC_TwoPowder and 1.1 μm Co powder
Powders, and mix these raw material powders as shown in Table 1.
And wet-mixed in a ball mill for 72 hours and dried.
After that, ISO · CNMG120408 (Carbide substrates A to C)
SEEN42AFTN1 (for carbide substrate D)
Into a green compact of the shape specified in
In the end, vacuum sintering under the conditions shown in Table 1
Substrates A to D were manufactured respectively. In addition, the above-mentioned carbide substrate A
In B and B, the bonded phase was formed on the surface as it was sintered.
Content is relatively high compared to the inside of the carbide substrate.
Co-enriched zone is formed, and the remaining carbide substrate C and
And D do not have the formation of the Co-rich zone,
It had a homogeneous structure. Table 1 shows that
Internal hardness of rock substrate A to D (Rockwell hardness A scale
). Next, the surfaces of these super-hard substrates A to D
Then, with the honing applied, a normal chemical vapor deposition
Table 2 and Table 3 (l-TiCN and l-
TiCNO has a vertically elongated crystal structure.
FIG. 4 shows conditions for forming an N layer and a TiCNO layer;
All layers formed under other conditions have a granular crystal structure
Under the conditions shown in Tables 4 and 5,
Coating with required composition and target layer thickness (flank of cutting edge)
By forming a layer, the present invention coated carbide tools 1 to 12,
And Ti_Two O_Three Comparative coated carbide tool without main layer formation
1 to 8 were produced respectively. The coated carbide tool of the present invention
For 1 to 12, each flank of the cutting edge was
X-ray diffraction using X-ray as source
Observation revealed that all were Ti_Two O_Three Diffraction angle of (2θ)
24.0 ± 1 degree, 34.5 ± 1 degree, 61.0 ± 1
And diffraction peaks appear at 63.0 ± 1 degree.
By Ti _Two O_Three The main layer is made of Ti_Two O_Three From
And the vertical section of the tool is mirror-polished
In the tool rake face and flank face_Two
O_Three The C and N contents of the main layer were determined by Auger electron spectroscopy.
Were measured using an analyzer._Two O_Three main
Of C and N in the total amount of C, N and O in the body layer
The ratio of the combined amount shows substantially the same value as the target content in Table 3.
Was. In addition, the constituent layers that constitute the hard coating layer are all targeted.
It had a layer thickness substantially the same as the layer thickness. Next, the coated carbide tools 1 to 9 according to the present invention are used.
And the comparative coated carbide tools 1 to 6, Work material: JIS SCM440 (hardness: HB220)
Round bar, Cutting speed: 400 m / min. , Cut: 3mm, Feed: 0.3 mm / rev. , Cutting time: 10 minutes, Dry high-speed continuous cutting test of alloy steel under the conditions of Work material: JIS SNCM439 (Hardness: HB250)
Timber, Cutting speed: 300 m / min. , Cut: 3mm, 0 feed: 0.2 mm / rev. , Cutting time: 5 minutes, High-speed intermittent cutting test of alloy steel under the following conditions
In these cutting tests, the flank wear width of the cutting edge was measured. this
Table 6 shows the measurement results. In addition, the present invention coating
Hard tools 9, 10 and comparative coated carbide tools 7, 8
hand, Work material: 100 mm wide x 500 mm long
Square material of JIS S25C (hardness: HB150), Cutting speed: 300 m / min. , Notch: 2mm, Feed: 0.15mm / blade, Cutting time: 10 minutes, A dry high-speed milling test was performed on mild steel under the conditions
The flank wear width of the blade was measured. Table 6 also shows the measurement results.
did. [0011] [Table 1] [0012] [Table 2][0013] [Table 3] [0014] [Table 4][0015] [Table 5][0016] [Table 6][0017] According to the results shown in Tables 4 to 6, the hard coating
Layer is Al_TwoO_ThreeTi adjacent to the layer_Two O _Three Place the main layer
The coated carbide tools 1 to 12 of the present invention having a layer structure of_Two
O_Three Compared with the comparative coated carbide tools 1-8 without the formation of the main layer
Excellent adhesion between the constituent layers of the hard coating layer
High-speed continuous cutting of steel, which becomes severe cutting conditions,
Excellent in high-speed interrupted cutting without peeling of the hard coating layer
Cutting performance over a long period of time
In the coated carbide tools 1 to 8, the Ti compound layer and the Al_TwoO
_ThreeHard in a relatively short time due to insufficient interlayer adhesion with the layer
Peeling occurs in any of the porous coating layers, causing
Obviously it will be life. As described above, the present invention
In the coated carbide tools, the constituent layers of the hard coating layer
With excellent interlayer adhesion, such as steel and cast iron
In addition to continuous and interrupted cutting under any normal conditions,
In particular, even if these cuttings are performed at high speed,
Demonstrated cutting performance, thus speeding up cutting
It can respond sufficiently and contribute to labor saving.

Continuation of the front page (56) References JP-A-11-310878 (JP, A) JP-A-11-77405 (JP, A) JP-A-8-1411 (JP, A) JP-A-59-219477 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23B 27/00-29/34 B23P 15/28 C23C 14/00-16/56

Claims (1)

(57) [Claim 1] A titanium carbide layer, a titanium nitride layer, and a titanium carbonitride layer each having an average layer thickness of 0.1 to 15 µm on the surface of a tungsten carbide-based cemented carbide substrate. A Ti compound layer composed of one or more of a layer, a titanium carbonate layer, a titanium oxynitride layer, and a titanium carbonitride layer; . An aluminum oxide layer having an average layer thickness of 5 to 15 μm, a surface-coated cemented carbide cutting tool obtained by chemical vapor deposition and / or physical vapor deposition of a hard coating layer composed of: 3 to 25 μm; Chemical vapor deposition formed between the Ti compound layer and the aluminum oxide layer , having an average layer thickness of 0.1 to 5 μm;
Mainly consists trioxide titanium and carbon and nitrogen as non-metallic elements other than oxygen, in total, trioxide titanium based layer containing 1-20 atomic% as a percentage of the total amount of oxygen, the A surface-coated cemented carbide cutting tool with a hard coating layer having excellent interlayer adhesion, characterized by having a layer structure arranged .