JP2003025115A - Surface coated cemented carbide cutting tool excellent in sliding property of cutting chip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool excellent in sliding property of cutting chips. SOLUTION: This surface coated cemented carbide cutting tool comprises an abrasive resistant coated layer deposited physically on the surface of tool base body comprising tungsten carbide base cemented carbide alloy or titanium carbonitride base cermet with an overall means layer thickness of 0.8 to 10 μm. This abrasive resistant coated layer is made from a circulatively and alternatively arranged layer of the first, second and third thin layers, each mean layer thickness of which is 0.01 to 0.1 μm comprises. (a) This first thin layer comprises either compound nitride of Ti and Al satisfying X: 0.1 to 0.7, m: 0.5 to 0.99 in atomic ratio measured, which are obtained by measuring the center section of a cross section in depth direction by means of an Auger spectral analysis device when it is expressed by a composition formula (Ti1- XAlX)N and (Ti1- XAlX)C1-m Nm or both of them, and (b) the second thin layer comprises aluminum oxide, and (c) the third thin layer comprises aluminum nitride.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is excellent in chip slidability, and is therefore extremely highly viscous, especially of stainless steel and mild steel, and chips are welded to the cutting blade surface. Even when used for high-speed cutting of difficult-to-cut materials, the chips flow smoothly without welding to the surface of the cutting edge, so that chipping or chipping (micro chipping) occurs in the cutting edge. The present invention relates to a surface-coated cemented carbide cutting tool (hereinafter referred to as a coated cemented carbide tool) which can exhibit excellent cutting performance for a long period of time. 2. Description of the Related Art Generally, a cutting tool includes a throw-away tip which is removably attached to a tip of a cutting tool for turning or planing of a work material such as steel or cast iron. There are drills and miniature drills used for drilling and cutting work materials, and solid-type end mills used for face milling, grooving, shoulder processing, etc. of the work material. A throw-away end mill tool or the like which is freely mounted and performs cutting in the same manner as the solid type end mill is known. [0003] In general, as the above-mentioned cutting tool, (a) as a lower hard layer of a wear-resistant coating layer, for example, a physical vapor deposition apparatus shown in a schematic explanatory view of FIG. Using an arc ion plating apparatus as a seed, the inside of the apparatus is heated to a temperature of 650 ° C. in a vacuum atmosphere of, for example, 1.3 × 10 ⁻³ Pa by a heater, and an anode electrode and Ti— Between the cathode electrode (evaporation source) on which the Al alloy is set, for example, a voltage:
An arc discharge is generated under the conditions of 35 V, current: 90 A,
At the same time, nitrogen gas or nitrogen gas and methane gas are introduced into the apparatus as a reaction gas, while a substrate made of tungsten carbide (hereinafter, referred to as WC) -based cemented carbide or titanium carbonitride (hereinafter, referred to as TiCN) -based cermet ( Hereinafter, these are collectively referred to as a cemented carbide substrate). Under the condition that a bias voltage of, for example, −200 V is applied, the surface of the cemented carbide substrate has a composition formula: (Ti _1-x Al _x ) N (T
i _1-X Al _X ) C _1-Y N _Y (however, X is 0.1 to 0.7 and Y is 0.5 to 0.99 in atomic ratio as measured by Auger spectroscopy) A single layer of a composite nitride layer of Ti and Al [hereinafter, referred to as (Ti, Al) N] and a layer of a composite carbonitride [hereinafter, indicated as (Ti, Al) CN], or 0.1 to 10 μm for both layers
(B) Further, on the surface of the lower hard layer, metal Al is used as a cathode electrode (evaporation source) on the surface of the lower hard layer by the same arc ion plating apparatus, and is introduced into the apparatus. Aluminum oxide (hereinafter, referred to as Al ₂ O ₃₎ was prepared under substantially the same conditions as the above-mentioned lower hard layer deposition formation except that the reaction gas was oxygen and a pulse bias voltage was applied.
A coated carbide tool is known, in which an upper hard layer composed of a layer (shown in FIG. 1) is formed with an average layer thickness of 0.5 to 15 μm. [0004] In recent years, the use of FA in cutting equipment has been remarkable. On the other hand, there has been a strong demand for labor saving, energy saving, and further cost reduction for cutting work. Is required to be versatile to cut as many types of work materials as possible with one type of tool.
Cutting also tends to be faster, but in the above-mentioned conventional coated carbide tools, there is no problem if this is used for cutting under ordinary conditions such as steel or cast iron, but this is extremely viscous. When used for high-speed cutting of work materials such as stainless steel and mild steel having high hardness, the chips of these work materials are formed of an Al ₂ O ₃ layer constituting a wear-resistant coating layer, (Ti, Al) N Layer and the (Ti, Al) CN layer,
It is easy to weld to the cutting edge surface, and this welding phenomenon becomes more noticeable as the cutting speed increases, and this welding phenomenon causes chipping and chipping of the cutting edge, resulting in a relatively short time. At present, the service life is reached. [0005] Accordingly, the present inventors have proposed:
From the above-mentioned viewpoint, it is difficult to weld chips to the cutting edge surface, especially when used for high-speed cutting of stainless steel and mild steel. In view of the above, the present inventors have paid particular attention to the above-mentioned conventional coated carbide tools, and as a result of conducting research, have found that the Al ₂ O ₃ layer, the (Ti, Al) N layer and ( The thickness of each of the Ti, Al) CN layers is an extremely thin layer having an average layer thickness of 0.01 to 0.1 μm, and further, aluminum nitride (Al) having an average layer thickness of 0.01 to 0.1 μm. (Hereinafter referred to as AlN).
In a state where these thin layers are circulated alternately and laminated,
When a wear-resistant coating layer having an overall average layer thickness of 0.8 to 10 μm is formed, in a coated carbide tool formed with the wear-resistant coating layer, AlN constituting the wear-resistant coating layer is used.
Extremely low affinity for highly viscous and difficult-to-cut materials such as stainless steel and mild steel in thin layers, which remain the same even in high-speed cutting with high heat generation. As a result, the welding of chips to the surface of the cutting edge is remarkably suppressed, the chipping and chipping of the cutting edge are eliminated, and the above-mentioned Al ₂ O ₃ layer constituting the wear-resistant coating layer, Research has shown that, in combination with the excellent wear resistance provided by the (Ti, Al) N and (Ti, Al) CN layers, excellent cutting performance will be exhibited over a long period of time. is there. The present invention has been made on the basis of the above research results, and has a surface of a super-hard substrate of 0.8 to 10 mm.
The wear-resistant coating layer physically deposited with a total average layer thickness of 0.1 μm is composed of a first thin layer and a second thin layer having individual average layer thicknesses of 0.01 to 0.1 μm.
A circulating alternating stack of thin layers and a third thin layer,
(A) the first thin layer, the composition _{formula: [Ti 1-X Al X} ] N and the _{[Ti 1-X Al X]} C 1-m when represented by N _m, the thickness direction central portion of the auger Any of (Ti, Al) N and (Ti, Al) CN satisfying X: 0.1 to 0.7 and m: 0.5 to 0.99 in atomic ratio as measured by a spectrometer. Or both, (b) providing said second thin layer with Al
_The present invention is characterized by a coated carbide tool having excellent chip sliding properties, comprising ₂ O ₃ , (c) and the third thin layer made of AlN. Next, the constituent layers of the wear-resistant coating layer of the coated carbide tool of the present invention will be described.
The first thin layer made of (Ti, Al) N and (Ti, Al) CN imparts hardness and toughness to the wear-resistant coating layer,
Excellent wear resistance without chipping
An effect is exhibited in coexistence with the second thin layer made of ₂ O ₃ . That is, Al in the first thin layer increases the hardness of TiN having high toughness, and thus forms a solid solution in order to improve wear resistance.
(Ti _{1- X} Al _X ) N and (Ti _1-X Al _X ) C _{1-Y NY}
If the X value is less than 0.1, the desired effect of increasing the hardness cannot be obtained. On the other hand, if the X value exceeds 0.7, chipping is likely to occur in the wear-resistant coating layer.
1 to 0.7 (atomic ratio), and (T
Since the C component in (i, Al) CN has an effect of further improving the hardness, (Ti, Al) CN has the above (T, Al) CN.
i, Al) It has a relatively high hardness compared to N, but in this case, the proportion of the C component is less than 0.01, that is, the Y value is 0.
If it exceeds 99, the predetermined hardness improving effect cannot be obtained, while C
When the proportion of the component exceeds 0.5, that is, when the Y value is less than 0.5, the toughness rapidly decreases,
Y value is 0.5 to 0.99, preferably 0.55 to 0.9
It was decided. The second thin layer made of Al ₂ O ₃ has excellent high-temperature hardness and heat resistance, and has a function of further improving the wear resistance of the wear-resistant coating layer in the state where the first thin layer coexists. It is. In addition, a second AlN
As described above, the thin layer exhibits excellent slipperiness with respect to chips such as highly viscous stainless steel and mild steel, and suppresses the chips from welding to the cutting blade surface. It has the effect of preventing chipping or chipping due to powder. [0008] The first thin layer constituting the wear-resistant coating layer,
The average thickness of each of the second thin layer and the third thin layer is set to 0.01 to 0.1 μm, respectively, when the average thickness of any of the thin layers is less than 0.01 μm. The properties of the thin layer, namely the toughness and hardness of the first thin layer, the high-temperature hardness and excellent heat resistance of the second thin layer, and the excellent chip slipping property of the third thin layer, are sufficient for the wear-resistant coating layer. On the other hand, even if the average thickness of any of the thin layers exceeds 0.1 μm, in the circulating alternately laminated structure of the wear-resistant coating layer, the layer having a thickness exceeding 0.1 μm is brittle. This is because a chemical phenomenon appears and this portion becomes a starting point of occurrence of chipping, chipping, and the like.
Further, the entire average layer thickness of the wear-resistant coating layer is 0.8 to 10 μm.
The reason is that if the layer thickness is 0.8 μm, the desired excellent wear resistance cannot be secured, while the layer thickness is 10 μm.
If the thickness exceeds μm, chipping and chipping of the cutting edge are likely to occur. Next, the coated carbide tool of the present invention will be specifically described with reference to examples. (Example 1) As raw material powders, WC powder, TiC powder, ZrC powder, V
C powder, TaC powder, NbC powder, Cr3 C2 powder, T
An iN powder, a TaN powder, and a Co powder were prepared, and these raw material powders were blended in the blending composition shown in Table 1, wet-mixed in a ball mill for 72 hours, dried, and then dried.
a into a green compact at the pressure of a
sintering in a vacuum at a temperature of 1400 ° C. for 1 hour, and after sintering, the cutting edge portion is subjected to a honing process of R: 0.05 to form a WC having a chip shape of ISO standard CNMG120408. Substrates A1 to A10 made of base cemented carbide
Was formed. [0010] As raw material powders,
TiCN having an average particle size of 2 μm (by weight ratio TiC /
(TiN = 50/50) powder, Mo2 C powder, ZrC powder, NbC powder, TaC powder, WC powder, Co powder, and Ni powder were prepared, and these raw material powders were blended into the composition shown in Table 2. After being wet-mixed in a ball mill for 24 hours and dried, the mixture is pressed into a green compact at a pressure of 100 MPa, and the green compact is heated in a nitrogen atmosphere of 2 kPa at a temperature of:
Sintered under the condition of holding at 1500 ° C. for 1 hour, and after sintering, the cutting edge portion is subjected to a honing process of R: 0.03 to obtain a TiC having a chip shape conforming to ISO standard, CNMG120408.
Carbide substrates B1 to B6 made of N-based cermet were formed. Next, these super-hard substrates A1 to A10 and B1 to B6 are subjected to ultrasonic cleaning in acetone and dried, and are each placed on a rotary table in a usual arc ion plating apparatus illustrated in FIG. On the other hand, as a cathode electrode (evaporation source), a Ti-Al alloy for forming a first thin layer having various component compositions, a second thin layer and a third thin layer
A metal Al for forming a thin layer is mounted at a predetermined position in the apparatus, and a metal Ti for bombardment cleaning is also mounted. First, the inside of the apparatus is evacuated to 700 ° C. Then, a DC bias voltage of -1000 V is applied to the cemented carbide body rotating on the rotary table to generate an arc discharge between the metal Ti of the cathode electrode and the anode electrode. Ti surface
Bombard cleaning followed by (Ti, Al) N and (T
The first thin layer made of (i, Al) CN is formed by introducing a nitrogen gas or a nitrogen gas and a methane gas as a reaction gas into the apparatus to form a reaction atmosphere of 5 Pa, and a super-hard rotating on the rotary table. The formation of the second thin layer made of Al ₂ O ₃ is performed under the condition that a DC bias voltage of −200 V is applied to the substrate, and oxygen is introduced into the apparatus as a reaction gas to form a reaction atmosphere of 1.3 Pa. Similarly, a pulse bias voltage of -300 V is applied to the carbide substrate rotating on the rotary table, and the formation of the third thin layer of AlN is performed by introducing nitrogen gas as a reaction gas into the apparatus. The reaction atmosphere was set to 6 Pa, and a pulse bias voltage of -300 V was applied to the superhard substrate rotating on the rotary table. In conditions for vacuuming for 10 seconds for a reaction gas discharge principle to the cathode electrode (the first thin layer forming Ti-Al alloy, a second thin layer and the third
An arc discharge is generated between the metal Al for forming a thin layer and the anode electrode, so that a first thin layer, a second thin layer having a target composition and a target layer thickness shown in Table 3 are formed on the surface of the cemented carbide substrate. And depositing the third thin layer in the combination shown in Table 3 and with the total number of thin layers and the total target layer thickness also shown in Table 4, to form a wear-resistant coating layer having a circulating interleaved laminated structure. As a result, a throw-away tip made of a surface-coated cemented carbide of the present invention as a coated carbide tool of the present invention having a shape shown in a schematic perspective view in FIG. 2A and a schematic longitudinal sectional view in FIG. The coated carbide tip of the present invention) 1
~ 16 were each manufactured. Further, for the purpose of comparison, as shown in Table 5, the third thin layer of AlN was not formed, and the (Ti, Al) N and (Ti, Al) CN ₂ except that a wear-resistant coating layer comprising an alternate lamination of one thin layer and a _second thin layer of Al ₂ O ₃ was formed under the same conditions as those for forming the coated carbide tips 1 to 16 of the present invention. Comparatively coated carbide alloy throw-away tips (hereinafter referred to as comparative coated carbide tips) 1 to 16 as comparative coated carbide tools having the shapes shown in Table 1 were produced, respectively. Next, the coated carbide tips 1 to 1 of the present invention will be described.
No. 6 and comparative coated carbide tips 1 to 16 were screwed to the tip of a tool steel tool with a fixing jig. Work material: JIS SUS304 round bar, Cutting speed: 320 m / Min. Notch: 1.8 mm Feed: 0.3 mm / rev. , Cutting time: 10 minutes, Dry high-speed continuous turning test of stainless steel under the following conditions: Work material: JIS SUS304, 4 longitudinally spaced round bars at regular intervals in the longitudinal direction, Cutting speed: 200 m / min. Infeed: 1.5 mm Feed: 0.3 mm / rev. , Cutting time: 3 minutes, Dry high-speed intermittent turning test of stainless steel under the following conditions:
Further, a work material: a round bar with four longitudinal grooves at equal intervals in the longitudinal direction of JIS S15C, a cutting speed: 270 m / min. Infeed: 1.2 mm Feed: 0.25 mm / rev. A dry high-speed intermittent turning test of mild steel was performed under the following conditions: cutting time: 5 minutes, and the flank wear width of the cutting edge was measured in each turning test. Table 6 shows the measurement results. [Table 1] [Table 2] [Table 3] [Table 4] [Table 5] [Table 6] (Example 2) As a raw material powder, an average particle diameter is as follows:
Medium coarse WC powder having 5.5 μm, fine WC powder of 0.8 μm, TaC powder of 1.3 μm, 1.2 μm
NbC powder, 1.2 μm ZrC powder, 2.3 μm
m3 Cr2 powder, 1.5 μm VC powder, 1.0
μm of (Ti, W) C powder and 1.8 μm of Co
Powders were prepared, and these raw material powders were respectively blended in the composition shown in Table 7, and further added with wax, and ball-mixed in acetone for 24 hours, and dried under reduced pressure.
Press molding at a pressure of 0 MPa into various green compacts of a predetermined shape, and pressing these green compacts in a vacuum atmosphere of 6 Pa at 7 ° C. /
The temperature was raised to a predetermined temperature in the range of 1370 to 1470 ° C. at a heating rate of 1 minute, kept at this temperature for 1 hour, and then sintered under the condition of furnace cooling to obtain a sample having a diameter of 8 mm, 13 mm, and 26 mm. Kinds of round bar sintered bodies for forming a cemented carbide substrate are formed, and the above three kinds of round bar sintered bodies are subjected to grinding processing in a combination shown in Table 7 to obtain the diameter × length of the cutting edge portion. Is 6mm × 1 each
3mm, 10mm x 22mm, and 20mm x 45m
Carbide substrate (end mill) C-1 to C-
8 were each produced. Next, these carbide substrates (end mills)
The surface of C-1 to C-8 is ultrasonically cleaned in acetone,
In a dry state, the substrate was charged into a normal arc ion plating apparatus also illustrated in FIG. 1 and the target composition and target shown in Table 3 were applied to the surface of the cemented carbide substrate under the same conditions as in Example 1 above. A first thin layer, a second thin layer, and a third thin layer
By depositing the thin layers in the combinations shown in Table 8 and also with the total number of thin layers and the total target layer thickness also shown in Table 8, a wear resistant coating having a circulating interleaved laminate structure is formed. 3 (a) is a schematic front view, and FIG. 3 (b) is a surface coated cemented carbide end mill (hereinafter referred to as a book) as a coated carbide tool according to the present invention having a shape shown by a schematic cross-sectional view of a cutting edge portion. Inventive coated carbide end mills) 1 to 8 were manufactured respectively. For the purpose of comparison, as shown in Table 9, the third thin layer of AlN was not formed, and the (Ti, Al) N and (Ti, Al) CN ₃ except that a wear-resistant coating layer consisting of an alternate lamination of one thin layer and a _second thin layer of Al ₂ O ₃ was formed under the same conditions as those of the above-mentioned coated carbide end mills 1 to 8 of the present invention.
The end mills (hereinafter, referred to as comparative coated cemented carbide end mills) 1 to 8 made of comparative surface coated cemented carbide as comparative coated cemented carbide tools having the shapes shown in FIG. Next, the coated carbide end mill 1 of the present invention will be described.
-8 and the comparative coated carbide end mills 1-8, the coated carbide end mills 1-3 of the present invention and the comparative coated carbide end mills 1-3 are: work material: plane dimension: 100 mm × 250 mm, thickness: 5
0 mm JIS SUS304 plate, Cutting speed: 75 m / min. , Groove depth (cut): 3 mm, Table feed: 120 mm / min, Wet high-speed grooving test of stainless steel (using water-soluble cutting oil), Carbide end mills 4-6 coated with the present invention and comparative coating For carbide end mills 4 to 6, Work material: Plane dimensions: 100 mm x 250 mm, thickness: 5
JIS S15C sheet material of 0 mm, Cutting speed: 85 m / min. , Groove depth (cut): 4.5 mm, Table feed: 125 mm / min, Dry high-speed grooving test for mild steel, coated carbide end mills 7, 8 according to the present invention and comparative coated carbide end mills 7, 8 About: Work material: Plane dimensions: 100 mm x 250 mm, thickness: 5
JIS SUS304 plate material of 0 mm, Cutting speed: 70 m / min. , Groove depth (cut): 7.5 mm, Table feed: 70 mm / min, Wet high-speed groove cutting test of stainless steel (using water-soluble cutting oil) under the following conditions: However, the cutting groove length was measured until the diameter of the tip surface of the cutting edge was reduced by 0.1 mm, which is a standard for the service life. The measurement results are shown in Tables 8 and 9, respectively. [Table 7] [Table 8] [Table 9] Example 3 The diameter produced in Example 2 was 8 mm (for forming the cemented carbide substrates C-1 to C-3) and 13 m.
m (for forming the super-hard substrate C-4 to C-6), and 26 mm
Using the three types of round bar sintered bodies (for forming the cemented carbide substrates C-7 and C-8), the three types of round bar sintered bodies were subjected to grinding to obtain the diameter × length of the groove forming portion. Are 4 mm × 13 mm (carbide substrate D-1 to D-3) and 8 mm × 22 mm (carbide substrate D
-4 to D-6) and a carbide substrate (drill) D having dimensions of 16 mm × 45 mm (carbide substrates D-7, D-8)
-1 to D-8 were produced respectively. Next, these carbide substrates (drills) D-
The surfaces of 1 to D-8 were ultrasonically cleaned in acetone, dried, and charged in a usual arc ion plating apparatus also illustrated in FIG. 1 under the same conditions as in Example 1 above. The first thin layer, the second thin layer, and the third thin layer having the target composition and the target layer thickness shown in Table 3 are combined on the surface of the superhard substrate in the combinations shown in Table 10 and also shown in Table 10. By forming a wear-resistant coating layer having a circulating alternately laminated structure by vapor deposition with the total number of thin layers and the total target layer thickness to be formed, a groove is formed in a schematic front view in FIG. Drills made of the surface-coated cemented carbide of the present invention (hereinafter, referred to as the coated carbide drill of the present invention) 1 to 8 as coated carbide tools of the present invention having the shape shown in the schematic cross-sectional view of the part were produced. For the purpose of comparison, as shown in Table 11, the third thin layer of AlN was not formed, and the third thin layer of (Ti, Al) N and (Ti, Al) CN under the above-described deposition conditions were not formed. 4 except that a wear-resistant coating layer consisting of an alternate lamination of one thin layer and a _second thin layer of Al ₂ O ₃ was formed under the same conditions as those of the coated carbide drills 1 to 8 of the present invention. Drills made of comparative surface-coated cemented carbide (hereinafter referred to as comparative coated cemented carbide drills) 1 to 8 as comparative coated cemented carbide tools having the shapes shown in FIG. Next, the above-mentioned coated carbide drills of the present invention 1 to 8
Of the coated carbide drills 1 to 8 of the present invention, the coated carbide drills 1 to 3 of the present invention and the comparative coated carbide drills 1 to 3 are: work material: plane dimension: 100 mm × 250 thickness: 50 mm
JIS SUS304 plate material, Cutting speed: 55 m / min. , Feed: 0.12 mm / rev, Wet high-speed drilling test of stainless steel under the following conditions: For coated carbide drills 4 to 6 of the present invention and comparative coated carbide drills 4 to 6, work material: plane dimensions : 100mm x 250mm, thickness: 5
0 mm JIS SUS304 plate, Cutting speed: 65 m / min. , Feed: 0.20 mm / rev, Wet high-speed drilling cutting test of stainless steel under the following conditions: coated carbide drills 7 and 8 of the present invention and comparative coated carbide drills 7 and 8 : 100mm x 250mm, thickness: 5
0 mm JIS S15C plate, Cutting speed: 140 m / min. , Feed: 0.30 mm / rev, Wet wet high-speed drilling cutting test of mild steel under the following conditions: In any wet (using water-soluble cutting oil) high-speed drilling cutting test, flank wear of the cutting edge at the tip 0.3 width
The number of drilling processes up to mm was measured. The measurement results are shown in Tables 10 and 11, respectively. [Table 10] [Table 11] The coated carbide tips 1 to 15, the coated carbide end mills 1 to 8 of the present invention and the coated carbide drill 1 of the present invention as the coated carbide tools of the present invention obtained as a result.
-8, and the wear-resistant coating layers of the comparative coated carbide tips 1-15, the comparative coated carbide end mills 1-8, and the comparative coated carbide drills 1-8 as the comparative coated carbide tools, respectively. The composition at the center in the thickness direction was measured using an Auger spectroscopic analyzer, and the thickness of the constituent layers of the wear-resistant coating layer was measured in cross section using a scanning electron microscope. It showed substantially the same value as the target layer thickness. From the results shown in Tables 4 to 11, it can be understood from the results shown in Tables 4 to 11 that the wear-resistant coating layer of the present invention has a circulating alternately laminated structure of a first thin layer, a second thin layer, and a third thin layer. Even if the hard tool is used for cutting stainless steel and mild steel at high speed with high heat generation, the interposition of the third thin layer of AlN significantly reduces the affinity with high-temperature heating chips, Since the powder does not adhere to the wear-resistant coating layer and the surface of the cutting edge always maintains excellent chip sliding property, chipping due to chip welding to the cutting edge may occur on the cutting edge. (Ti, Al) N and (T
In combination with the action of the first thin layer made of (i, Al) CN and the _second thin layer made of Al ₂ O ₃ , excellent wear resistance is exhibited. In the comparative coated cemented carbide tool without the formation of, the chip is easily welded to the wear-resistant coating layer, which causes the wear-resistant coating layer to be locally peeled off, causing chipping of the cutting edge, It is clear that the service life is reached in a relatively short time. As described above, the coated cemented carbide tool of the present invention is made of stainless steel, which is not only cut under various conditions such as steel or cast iron under ordinary conditions, but also has a particularly high viscosity, and the cutting chips are easily welded to the cutting blade surface. It shows excellent chip slipperiness even in high-speed cutting of steel and mild steel, and shows versatile cutting performance. Therefore, the use of FA in cutting equipment, labor saving and energy saving in cutting, and lower cost It can respond satisfactorily to the conversion.

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.

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[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] 0011 [Correction method] Change [Content of amendment] [0011] Then, these cemented carbide substrates A1 to A10 and B1 to B6 are replaced with acetone. Each of them is mounted on a rotary table in a usual arc ion plating apparatus illustrated in FIG. 1 in a state of being ultrasonically cleaned and dried, and has various component compositions as a cathode electrode (evaporation source). Ti-Al alloy for forming the first thin layer, the second thin layer and the third
A metal Al for forming a thin layer is mounted at a predetermined position in the apparatus, and a metal Ti for bombardment cleaning is also mounted. First, the inside of the apparatus is evacuated to 700 ° C. Then, a DC bias voltage of -1000 V is applied to the cemented carbide substrate rotating on the rotary table to generate an arc discharge between the metal Ti of the cathode electrode and the anode electrode. Ti surface
Bombard cleaning followed by (Ti, Al) N and (T
The first thin layer made of (i, Al) CN is formed by introducing a nitrogen gas or a nitrogen gas and a methane gas as a reaction gas into the apparatus to form a reaction atmosphere of 5 Pa, and a super-hard rotating on the rotary table. The formation of the second thin layer made of Al ₂ O ₃ is performed under the condition that a DC bias voltage of −200 V is applied to the substrate, and oxygen is introduced into the apparatus as a reaction gas to form a reaction atmosphere of 1.3 Pa. Similarly, a pulse bias voltage of -300 V is applied to the carbide substrate rotating on the rotary table, and the formation of the third thin layer of AlN is performed by introducing nitrogen gas as a reaction gas into the apparatus. The reaction atmosphere was set to 6 Pa, and a pulsed bias voltage of -300 V was applied to the carbide substrate rotating on the rotary table. In conditions for vacuuming for 10 seconds for a reaction gas discharge principle to the cathode electrode (the first thin layer forming Ti-Al alloy, a second thin layer and the third
An arc discharge is generated between the thin-layer forming metal Al) and the anode electrode, so that a first thin layer and a second thin layer having a target composition and a target layer thickness shown in Table 3 are formed on the surface of the cemented carbide substrate. ,
And depositing the third thin layer in the combination shown in Table 3 and with the total number of thin layers and the total target layer thickness also shown in Table 4, to form a wear-resistant coating layer having a circulating interleaved laminated structure. As a result, a throw-away tip made of a surface-coated cemented carbide of the present invention as a coated carbide tool of the present invention having a shape shown in a schematic perspective view in FIG. 2A and a schematic longitudinal sectional view in FIG. The coated carbide tip of the present invention) 1
~ 16 were each manufactured. [Procedure amendment 2] [Document name to be amended] Description [Item name to be amended] 0034 [Amendment method] Change [Content of amendment] [Effect of the invention] From the results shown in Tables 4 to 11, the wear-resistant coating was obtained. Each of the coated carbide tools according to the present invention, which has a layered structure in which layers are circulated and interleaved with a first thin layer, a second thin layer, and a third thin layer, performs cutting of stainless steel and mild steel at high speed with high heat generation. However, due to the interposition of the third thin layer of AlN, the affinity with the chips heated at a high temperature is significantly reduced, the chips do not adhere to the wear-resistant coating layer, and the surface of the cutting blade is always excellent. Since chip slidability is maintained, chipping due to chip welding to the cutting edge does not occur on the cutting edge, and (Ti, Al) N and (T) coexist as constituent layers.
In combination with the action of the first thin layer made of (i, Al) CN and the _second thin layer made of Al ₂ O ₃ , excellent wear resistance is exhibited. In the case of a comparative coated carbide tool without the formation of a chip, the chip easily adheres to the wear-resistant coating layer, and this causes the wear-resistant coating layer to be locally peeled off, causing chipping of the cutting edge. It is clear that the service life can be reached in an extremely short time. As mentioned above,
The coated carbide tool of the present invention can be used not only for cutting under ordinary conditions such as various kinds of steel and cast iron, but also for high-speed cutting such as stainless steel and mild steel, which are particularly highly viscous and easily adhere to the cutting edge surface. It shows excellent chip slipperiness even in cutting and shows versatile cutting performance.
It is possible to satisfactorily cope with A and cutting and labor saving, energy saving, and 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 FF05 FF10 FF13 FF16                       FF19 FF25                 4K029 AA04 BA44 BA54 BA58 BB02                       BC00 BC02 BD05 CA04 EA01

Claims (1)

Claims: 1. A tungsten carbide-based cemented carbide substrate or a titanium carbonitride-based cermet substrate has a surface of 0.8 to 10%.
The wear-resistant coating layer physically deposited with a total average layer thickness of 0.1 μm is composed of a first thin layer and a second thin layer having individual average layer thicknesses of 0.01 to 0.1 μm.
(A) The first thin layer is composed of [Ti _1-x Al _x ] N and [Ti _1-x Al _x ] C ₁ when expressed in _-m N _m, as measured by Auger spectroscopy apparatus in the thickness direction central portion, in terms of atomic ratio, X: 0.1~0.7, m: 0.5~0.99 Ti satisfying the (B) the second thin layer is made of aluminum oxide, and (c) the third thin layer is made of aluminum nitride. A cutting tool made of a surface-coated cemented carbide having excellent chip slidability.