JPH11104910A - Drill, drilling work method and drilling work device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress wear to a range of practical use even when a dry-cut is performed, by coating a film of specific composition. SOLUTION: A nitride or carbonitride of TiAl is coated on a steel-made drill for high speed tool. In this way, in Al in a coating film, a temperature rises by cutting heat. As a result, Al is oxidized in the atmosphere, and an oxide film of high wear resistance is formed in a surface of the coating film. In a film of the composition of (Ti(1-x) Alx ) (Ny C(1-y) ) (where 0.3<=x<=0.8, 0.6<=y<=1.0), the ratio of (Ti(1-x) Alx ) to (Ny C(1-y) ) is (1.1:0.9) to (0.9:1.0). That is, w in Ti(1-x) Alx )(1-w) (Ny C(1-y) )w is 0.45<=w<=0.55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill used for drilling, a drilling method and a drilling apparatus.

[0002]

2. Description of the Related Art Drilling machines are used for drilling metal.
During drilling with a drilling machine, a cutting fluid is supplied to the cutting portion. Cutting oils have a bad working environment, such as off-flavors, dirt from oil, and generation of oil smoke, and have problems of waste oil treatment. Therefore, in recent years, there has been an increasing need for dry cutting in which cutting is performed without using a cutting oil in machining due to environmental problems.

[0003]

Dry cutting is desired even in drilling with a drilling machine. However, with the current drill, wear is severe when used without using a cutting oil.
At present, it has not been put to practical use, and the emergence of a drill and a drilling method capable of dry cutting has been demanded.

[0004] The present invention has been made in view of the above-mentioned circumstances, and is a drill for performing abrasion within a practical range even when dry cutting is performed, and a drill for performing a drill within a practical range even after performing dry cutting. It is an object of the present invention to provide a drilling device in which a drilling method can be used and drill wear falls within a practically usable range even when dry cutting is performed.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a drill according to the present invention comprises a high-speed tool steel which is substantially made of (Ti _(1-x) Al _x ) (N _y C _{(1 -y)} ) wherein at least one film having a composition of 0.3 ≦ x ≦ 0.8 0.6 ≦ y ≦ 1.0 is coated.

[0006] In addition, (Ti _(1-x) Al _x ) _(1-w) (N _y C _(1-y) ) _w, but 0.3 ≦ x ≦ 0.8 0.6 ≦ It is characterized in that at least one film having a composition of y ≦ 1.0 0.45 ≦ w ≦ 0.55 is coated.

Further, in the high-speed tool steel, the nitride forming element is set to M, and (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C _(1-y) ) _w However, it is characterized in that at least one film having a composition of 0.3 ≦ x ≦ 0.80.6 ≦ y ≦ 1.00.2 ≦ z ≦ 0.70.7 ≦ (z + x) <1.00.45 ≦ w ≦ 0.55 is coated at least one layer.

[0008] In order to achieve the above object, a drilling method of the present invention is characterized in that drilling is performed by dry cutting without using a cutting oil by any of the aforementioned drills. Then, a hole is formed by blowing air to the cutting portion.

In order to achieve the above object, the drilling apparatus according to the present invention is characterized in that high-speed tool steel is substantially made of (Ti _(1-x) Al _x ) (N _y C _(1-y) ) A drill coated with at least one layer of a film having a composition of 0.3 ≦ x ≦ 0.8 0.6 ≦ y ≦ 1.0 is mounted on a tool spindle which is driven toward and away from a workpiece and which is driven and rotated.

[0010] In addition, (Ti _(1-x) Al _x ) _(1-w) (N _y C _(1-y) ) _w in the high-speed tool steel, where 0.3 ≦ x ≦ 0.8 0.6 ≦ A drill coated with at least one layer of a film satisfying y ≦ 1.0 0.45 ≦ w ≦ 0.55 is attached to a tool spindle which is driven to rotate toward and away from a workpiece.

Further, in the high-speed tool steel, the nitride forming element is set to M, and (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C _(1-y) ) _w However, a drill coated with at least one layer of a film having the composition of 0.3 ≤ x ≤ 0.8 0.6 ≤ y ≤ 1.0 0.2 ≤ z ≤ 0.7 0.7 ≤ (z + x) <1.0 0.45 ≤ w ≤ 0.55 is moved toward and away from the work. In addition, it is attached to a tool spindle which is driven and rotated.

[0012] The above-mentioned drilling apparatus is characterized in that air supply means for blowing air to the cutting portion is provided.

[0013]

1 and 2, a description will be given of a drilling apparatus and a drill according to the present invention. FIG. 1 shows a schematic configuration of a drilling apparatus according to an embodiment of the present invention, and FIG. 2 shows a side view of a drill according to an embodiment of the present invention.

As shown in FIG. 1, a drilling machine 21 as a drilling device is supported so that a column 23 can freely move toward and away from the table 22 on which a work is placed (movable up and down). A rotating tool spindle 24 is provided. The drill 1 is mounted on the tool spindle 24. The drill 1 is sent to the work side while being driven and rotated by driving the tool spindle 24 and moving up and down the column 23, thereby drilling the work.

As shown in FIG. 2, the drill 1 is provided with a shank portion 2 which is fixedly supported on a tool spindle 24 of a drilling machine 21, and a torsion groove-shaped cutting edge portion 3 is provided at the tip of the shank portion 2.
Is provided. A cutting edge portion 4 is provided at the tip of the cutting blade portion 3. The shank 2 is the tool spindle 2 of the drilling machine 21
4 and driven by the drill 1 to rotate the cutting edge 4
Drilling is performed on a work (not shown) by the cutting blade 3. During drilling, cutting is performed by dry cutting without supplying cutting fluid. In the dry-cut processing, no cutting oil is used, so that there is no generation of stains and unusual odors on the floor, and no waste oil treatment is required. Therefore, it is suitable for improving the working environment and the global environment.

As the drill 1, a drill 1 made of high-speed tool steel (high-speed) coated with TiAl nitride or TiAl carbonitride is used. The nitride of TiAl or the carbonitride of TiAl coated on the drill 1 may be a single-layer coated one or a multi-layer coated one coated with any material. Since the drill 1 is made of high-speed steel, the cost can be reduced at low cost.

As the drill 1, a high-speed tool steel drill is used.
By coating with TiAl nitride and TiAl carbonitride, the temperature of Al in the coating film rises due to the cutting heat, and as a result, it is oxidized by the atmosphere and an oxide film with high wear resistance is formed on the surface of the coating film. The drill 1 is hardly worn. Further, the oxide film has an effect of preventing oxidation inside the film, and can keep the adhesion of the coating film strong.

Then, substantially (Ti _(1-x) Al _x ) (N _y C
_(1-y) ) (where 0.3 ≦ x ≦ 0.8, 0.6 ≦ y ≦
(Ti _(1-x) Al _x ) and (N _y C _(1-y) ) in the 1.0) film
Is (Ti _(1-x) Al _x ) :( N _y C _(1-y) ) = 1.1: 0.
From 9 it is between (Ti _(1-x) Al _x ) :( N _y C _(1-y) ) = 0.9: 1.1. That is, (Ti _(1-x) Al _x ) _(1-w) (N _y C
_(1-y) ) _w in w is 0.45 ≦ w ≦ 0.55.

Usually, (Ti _(1-x) Al _x ) and (N _y C _(1-y) )
Is assumed to be 1: 1.
There is no problem even if NC is contained abundantly to strengthen solid solution.

FIG. 3 shows the relationship between the value of x and the flank wear of a material having a composition of (Ti _(1-x) Al _x ) N. (T
i _(1-x) Al _x ) N film thickness of 1.7 μm
It is. With a coating film of (Ti _(1-x) Al _x ) N in the range of 0.3 ≦ x ≦ 0.8, the flank wear is below the practical wear limit at a cutting speed of 150 m / min or less, making it practically practical. . The state shown in FIG. 3 is a dry cut in which no cutting fluid is applied. When a cutting fluid is applied (wet cut), the flank wear is increased by 1.8 times, and the practical cutting speed range is 70%.
m / min or less.

The work material in FIG. 3 is SCr420.
(H _B 170), and the thickness of the work is 30 mm. The drill 1 has a diameter of 30 mm and a base material made of SKH55, and is provided with a predetermined coating. The cutting conditions are 0.2mm / re feed
v, The depth of the hole was 30 mm and the work was penetrated. The total number of drilled holes is 100, and the flank wear after drilling 100 holes is checked.
It was examined whether the value was below the practical wear limit of 0.2 mm.

The drill 1 of the present embodiment exerts a performance higher than that of a wet cut when used in a dry cut. In each case, the crater wear is small, and the life of the drill 1 is determined only by the flank wear. When wet cutting is performed with a carbide drill, the cutting speed exceeding the practical wear limit under the conditions shown in FIG. 3 is 70 m / min, and dry cutting with the drill 1 of the present embodiment increases the tool life.

FIG. 4 shows the relationship between the y value of the material of the coating film having the composition of (Ti _0.5 Al _0.5 ) (N _y C _(1-y) ) and the flank wear. (Ti _0.5 Al _0.5 ) (N _y C
The thickness of the material having the composition of _(1-y) ) is 1.7 μm. 0.6 ≦ y ≦ 1.0 range of _{(Ti 0.5 Al 0. 5) (} N y C
_With a coating film of _(1-y) ), the cutting speed is 150m / min
At the following cutting speed, the flank wear is reduced below the practical wear limit, and it becomes practical. Also in this case, the crater wear does not matter, and the life of the drill 1 is determined by the flank wear. The processing conditions in FIG. 4 are the same as those in FIG.

FIG. 5 shows the (Ti _0.5 Al _0.5 ) N coating, in which the appropriate value of the film thickness was obtained. The horizontal axis of FIG. 5 shows the total film thickness. That is, if (Ti _0.5 Al _0.5 ) N is a single layer, the thickness is represented, and if it is a multilayer, the total thickness of all films is represented. The vertical axis is the single layer (Ti _0.5 Al
_0.5 ) The ratio of the flank wear when the flank wear of a drill 1 coated with N at a film thickness of 1.7 μm is defined as 1.

The relationship between flank wear and film thickness when a single layer of (Ti _0.5 Al _0.5 ) N is coated shows that the film thickness is 0.5%.
At 25 μm, the flank wear is about 25% greater than at 1.7 μm, and gradually decreases as the thickness increases, and at 10 μm, the thickness decreases by about 25% compared to 1.7 μm. Become. However, when the film thickness is reduced to 0.3 μm or
As the thickness increases, the flank wear increases rapidly. The reason why the wear increases as the film thickness increases is that the film peels off.

When the coating of (Ti _0.5 Al _0.5 ) N is multi-layered, for example, 0.05 μm TiN is added to (Ti _0.5 A
When _0.5 or 10 layers are coated between l _0.5 ) N, as shown in FIG. 4, slightly higher performance is obtained than in the case of a single layer. Therefore, when the film thickness is 0.5 μm or more,
It is preferably 10 μm or less, and may be a single layer or a multilayer.

The cutting speed in the case shown in FIG. 5 is 100 m / min, and the other conditions are the same as those in FIG. 3 except for the film thickness.

FIG. 6 shows the relationship between the feed (mm / rev) and the cutting speed that can be accommodated in the flank wear that can be practically used. If the cutting speed is equal to or lower than the cutting speed shown in FIG. 6, the flank wear is below the practical limit, and practical use is possible. As can be seen from FIG. 6, the practicable cutting speed is not significantly affected by the feed, and the practicable cutting speed is about 150 m / min or less.

The processing conditions were such that the coating was (Ti _0.5 Al
_0.5 ) N, and the others are the same as in FIG. 3 except for the feed.

FIG. 7 shows the relationship between the material and hardness of the work and the cutting speed that can be accommodated in practically usable flank wear. If the cutting speed is equal to or lower than the cutting speed shown in FIG. 7, the flank wear is below the practical limit, and practical use becomes possible. As can be seen from FIG. 7, the practicable cutting speed is 150 m / min or less, regardless of the work material and the hardness, in the range of the work material and the hardness that are generally used.

As the work material, carburized steel and case hardened steel are used.
SCM415 of _{H B 120 ~H B 250, SCM435} , SCr420, SCr435, SC
M440, SNCM415 is another, carbon steel, H _B 150 ~H _B 300
Of S30C, S45C, S55C and another, cast iron H _B 150 ~H _B 300
FC150, FC300, FCD350, FCD600 and others. Processing conditions are
The coating is (Ti _0.5 Al _0.5 ) N, and the others are the same as in FIG. 3 except for the work material.

FIG. 8 shows the relationship between the base material (high-speed material) of the drill 1 and the cutting speed that can be accommodated in practically available flank wear. That is, for example, as high-speed steel, SKH51, SKH55, powdered high-speed (1.3% C, 6% W, 5% Mo, other), powdered high-speed (2.2% C, 12%
(W, 2.5% Mo, etc.) was applied to investigate the cutting speed range within the flank wear that is practical for various high-speed steel materials.

For various high-speed steel materials, about 15
It turns out that it becomes practical at a cutting speed of 0 m / min or less.
The processing conditions are the same as in the case of FIG. 3 except that the coating material is (Ti _0.5 Al _0.5 ) N and the other conditions are the same except for the base material (high-speed material).

As described above, the value of x is in the range of 0.3 ≦ x ≦ 0.8 and the value of y is in the range of 0.6 ≦ y ≦ 1.0 (Ti
Drilling with a high-speed steel drill 1 coated with a coating film of _(1-x) Al _x ) (N _y C _(1-y) ) can realize dry cutting, and the cutting speed can be reduced. Above the wet cut, and can improve the productivity together with the dry cut.

Next, another example of a film coated on the drill 1 will be described. As a drill 1, TiAl nitride, TiAl added with a nitride-forming element capable of forming high-quality nitride,
Coated with carbonitride. A drill 1 in which either a single layer of TiAl nitride or TiAl carbonitride to which a nitride-forming element is added or a single layer coated in a multilayer coating with any material is used.

Here, the nitride forming elements include Zr (zirconium), Hf (hafnium), Y (yttrium), V (vanadium), Nb (niobium), Ta (tantalum), Si (silicon), and Cr (silicon). Chrome), Mo (molybdenum),
W (tungsten), B (boron), Mg (magnesium), Ca (calcium) and Be (beryllium) are applied.

That is, when the nitride-forming element is M,
To (Ti_zAl_xM_(1-zx))_(1-w)(N _yC_(1-y))_wPair of
(However, 0.3 ≤ x ≤ 0.8, 0.6 ≤ y ≤ 1.0, 0.2 ≤
z ≦ 0.7, 0.7 ≦ (z + x) <1.0, 0.45 ≦ w ≦ 0.55
Use at least one layer of the film
Because

Further, (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y
C _(1-y) ) By defining the range of x in _w at 0.3 ≤ x ≤ 0.8 and defining the range of y at 0.6 ≤ y ≤ 1.0, the range of z is the range of 1 minus x. (Z =
1-x). For this reason, TiAl and NC have the same composition range as in the above case where the nitride-forming element M is not added, and substantially the same effect as the results of FIGS. 3 to 8 can be obtained. By adding the nitride-forming element M, the nitride-forming element M can replace TiAl and form a high-quality nitride.

Hereinafter, a case where V (vanadium), B (boron) and Zr (zirconium) are applied as typical elements of the nitride forming element M will be specifically described with reference to FIGS. FIG. 9 shows the relationship between cutting speed and flank wear when V and B are slightly added, and FIG. 10 shows V and B.
10 shows the relationship between cutting speed and flank wear when more Zr is added than in FIG.

[0040] In this case, the material of the work is SCr420 (H _B 17
0) and the thickness of the work is 30 mm. The drill 1 has a diameter of 30 mm and a base material made of SKH55, and is provided with a predetermined coating. The cutting conditions were a feed of 0.2 mm / rev and a hole depth of 30 mm, and the workpiece was penetrated. 100 holes
It was a hole, and the flank wear after machining 100 holes was examined.

As shown in FIG. 9, (Ti_zAl
_xM_(1-zx))_(1-w)(N_yC_(1-y))_wAs (Ti
_0.695Al_0.3V_0.005) N, (Ti_0.2Al_0.795V_0.005) N, (Ti
_0.5Al_0.45B_0.05) (N_0.9C _0.1))
When the layer is coated on drill 1, the cutting speed is 150m / m
The flank wear is less than the practical wear limit (0.20mm) below in
Less tool wear. For this reason, nitride
When the forming elements V and B are slightly added,
Also has the same high efficiency and low efficiency as when no nitride-forming element is added.
Cost processing can be realized.

As shown in FIG. 10, (Ti _z Al _x M
_(1-zx) ) _(1-w) (N _y C _(1-y) ) _w , (Ti _0.5 Al
_0.4 V _0.1 ) N, (Ti _0.6 Al _0.2 B _0.2 ) N, (Ti _0.4 Al _0.3 V _0.3 ) (N
_When drill 1 is coated with at least one layer of the composition of ( _0.7 C _0.3 ), (Ti _0.4 Al _0.3 Zr _0.3 ) (N _0.6 C _0.4 ), the flank wear amount is less than the practical wear limit at a cutting speed of around 150 m / min or less. (0.20mm) less than tool wear. Therefore, even when V, B, and Zr, which are nitride-forming elements, are added more than in FIG. 9, the same high-efficiency and low-cost processing as when no nitride-forming element is added can be realized.

If the amount of the nitride-forming element to be added exceeds 0.3 in the composition ratio as compared with the composition of the TiAl-added element, the film is liable to peel off. 0.3 or less is preferable compared to the composition of the element. If the amount of the nitride-forming element exceeds 0.3 (z + x is less than 0.7) as compared with the composition of the TiAl-added element, that is, if the proportion of the nitride-forming element M is too large, the basic characteristics of TiAl are impaired and peeling occurs. Will occur.

Next, the case where the ratio of the metal element (Ti, Al, the nitride forming element to be added) and the nonmetal element (N) containing C is changed will be specifically described with reference to FIG. FIG. 11 shows the relationship between the cutting speed and the flank wear when the composition ratio of the metal element and the nonmetal element including C is changed between 0.45 and 0.55. The processing conditions are the same as those shown in FIGS. The coating film is a single layer and the film thickness is 1.
7 μm.

As shown in FIG. 11, (Ti _z Al _x M
_(1-zx) ) _(1-w) (N _y C _(1-y) ) _w , (Ti _0.5 Al
_0.4 V _0.1 ) _0.45 N _0.55 and (Ti _0.5 Al _0.4 V _0.1 ) _0.55 N _0.45 In any case, the flank wear amount is less than the practical wear limit (0.20 mm) at cutting speeds of around 150 m / min or less, and high efficiency and low cost machining can be realized. Here, w is set to 0.45 ≦ w ≦ 0.55 because w is
If the ratio is out of the range of 0.45 ≦ w ≦ 0.55, the film may be peeled off or the abrasion resistance of the film may be reduced.

Incidentally, usually, (Ti _z Al _x M _(1-zx) ) and (N _y
The ratio of C _(1-y) ) _w is assumed to be 1: 1. However, the ratio of non-metallic elements including C to the metal elements Ti, Al and the added nitride-forming element is increased or decreased. There is no problem. Solid solution strengthening can be expected by increasing the amount of nonmetallic elements including C.

As described above, even when a film to which V, B and Zr are added as a nitride-forming element M is coated and dry-cut, the wear amount is within the practical wear limit, and V, B and Zr The same high-efficiency and low-cost processing as in the case where no is added can be realized. Incidentally, as the nitride forming element M,
Even when coating with a film to which elements other than V, B and Zr are added and performing dry cutting, high-efficiency and low-cost processing can be realized as in the case where V, B and Zr are added.

A drill according to a second embodiment of the present invention will be described with reference to FIG. FIG. 12 shows a side view of the drill according to the second embodiment of the present invention. The drill shown in FIG. 12 performs a drilling process by blowing air to a cutting portion.

The drill 11 has a drilling machine 21 shown in FIG.
The shank portion 12 is fixedly supported on the tool spindle 24 of the cutting tool.
3 are provided. The tip of the cutting blade 13 has a blade tip 14.
Are provided, and an air hole 15 is formed in the blade edge portion 14. The air hole 15 communicates with the end face of the shank portion 12, and air is supplied to the air hole 15 from an air source (not shown) via the shank portion 12. By supplying the air to the air hole 15, the air is blown to the cut portion during the drilling.

The shank portion 12 is attached to the tool spindle of the drilling machine, and drilling is performed on a work (not shown) by the cutting edge portion 14 and the cutting edge portion 13 when the drill 11 is driven and rotated. During drilling, cutting is performed by dry cutting without supplying a cutting oil, and air is blown out from the air hole 15 to blow air to the cut portion.

By blowing air from the air hole 15 to the cutting portion, chips generated during the cutting can be blown off from the cutting portion and removed. Air hole 1
By supplying air from 5 to the cutting portion, the flank wear of the drill 11 is reduced by about 15% as compared with a case where drilling is performed by dry cutting without supplying air. In this case, the processing conditions are such that the value of x of the material having the composition of (Ti _(1-x) Al _x ) N is 5 in FIG. 3 and the cutting speed is 150 m / min. The air supply pressure is 2 kg / cm ² , and the flank wear does not change even if the air supply pressure is further increased.

[0052]

According to the drill of the present invention, (Ti _(1-x) Al _x ) (N _y C _(1-y) ) is added to the high-speed tool steel, where 0.3 ≦ x ≦ 0.8 0.6 ≦ Since at least one layer having a composition of y ≦ 1.0 is coated, the wear resistance is improved, and the wear can be kept within a practical range even when dry cutting is performed. As a result, drilling can be performed by dry cutting, the working environment for drilling can be improved, and the problem of waste oil treatment can be eliminated.

Further, in the high-speed tool steel, (Ti _(1-x) Al _x ) _(1-w) (N _y C _(1-y) ) _w However, 0.3 ≦ x ≦ 0.8 0.6 ≦ Since at least one layer having a composition of y ≦ 1.0 0.45 ≦ w ≦ 0.55 is coated, abrasion resistance is improved, and even if dry cutting is performed, abrasion can be kept within a practical range. As a result, drilling can be performed by dry cutting, the working environment for drilling can be improved, and the problem of waste oil treatment can be eliminated.
In addition, it is expected that solid solution strengthening of the coating film can be expected by adding N or C to Ti or Al, which is a metal element, in the same amount or more.

Further, in the high-speed tool steel, the nitride-forming element is set to M, and (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C _(1-y) ) _w However, since 0.3 ≤ x ≤ 0.8 0.6 ≤ y ≤ 1.0 0.2 ≤ z ≤ 0.7 0.7 ≤ (z + x) <1.0 0.45 ≤ w ≤ 0.55 at least one layer is coated, the wear resistance is improved and the dry cut , The wear can be kept within a practical range. As a result, drilling can be performed by dry cutting, the working environment for drilling can be improved, and the problem of waste oil treatment can be eliminated.
In addition, it is expected that solid solution strengthening of the coating film can be expected by adding N or C to Ti or Al, which is a metal element, in the same amount or more.

Further, in the drilling method of the present invention, drilling is performed by dry cutting without using a cutting oil with the above-mentioned drill, so that drilling can be performed without deteriorating the working environment.

Further, since the drilling process is performed by blowing air to the cutting portion, chips can be prevented from being caught and wear can be reduced.

Further, the drilling apparatus of the present invention is characterized in that (Ti _(1-x) Al _x ) (N _y C _(1-y) ) is added to the high-speed tool steel. A drill coated with at least one layer with a composition of 0.6 ≦ y ≦ 1.0 is attached to the tool spindle that rotates close to and away from the workpiece and drives and rotates, so the wear resistance of the drill is improved and dry cutting is performed. The wear can be kept within a practical range. As a result, drilling can be performed by dry cutting, the working environment for drilling can be improved, and the problem of waste oil treatment can be eliminated.

Further, in the high-speed tool steel, (Ti _(1-x) Al _x ) _(1-w) (N _y C _(1-y) ) _w However, 0.3 ≦ x ≦ 0.8 0.6 ≦ A drill coated with at least one layer of y ≤ 1.0 0.45 ≤ w ≤ 0.55 is attached to the tool spindle that moves toward and away from the workpiece and rotates while driving, so that the wear resistance of the drill is improved and dry cutting is performed. , The wear can be kept within a practical range. As a result, drilling can be performed by dry cutting, the working environment for drilling can be improved, and the problem of waste oil treatment can be eliminated. It is also a metal element
By adding N, C to Ti, Al in equal or greater amount, solid solution strengthening of the coating film can be expected.

In the high-speed tool steel, the nitride forming element is set to M, and (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C _(1-y) ) _w However, a drill coated with at least one layer of a film having the composition of 0.3 ≤ x ≤ 0.8 0.6 ≤ y ≤ 1.0 0.2 ≤ z ≤ 0.7 0.7 ≤ (z + x) <1.0 0.45 ≤ w ≤ 0.55 is moved toward and away from the work. Further, since the drill is mounted on the tool spindle which is driven and rotated, the wear resistance of the drill is improved, and the wear can be kept within a practical range even when dry cutting is performed. As a result, drilling can be performed by dry cutting, the working environment for drilling can be improved, and the problem of waste oil treatment can be eliminated. It is also a metal element
By adding N, C to Ti, Al in equal or greater amount, solid solution strengthening of the coating film can be expected.

Since the air supply means for blowing air to the cutting portion is provided, by blowing air from the air supply means, it becomes possible to prevent chips from being caught and reduce wear.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a drilling apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of the drill according to the embodiment of the present invention.

FIG. 3 is a graph showing a state of flank wear.

FIG. 4 is a graph showing the state of flank wear.

FIG. 5 is a graph showing the relationship between film thickness and flank wear.

FIG. 6 is a graph showing the relationship between cutting speed and feed.

FIG. 7 is a graph showing a relationship between a work material and a cutting speed.

FIG. 8 is a graph showing a relationship between a base material and a cutting speed.

FIG. 9: (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C _(1-y) )
₅ is a graph showing the relationship between flank wear and cutting speed when _w is coated.

FIG. 10: (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C
_(1-y) is a graph showing the relationship between flank wear and cutting speed when _w is coated.

FIG. 11: (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C
_(1-y) is a graph showing the relationship between flank wear and cutting speed when _w is coated.

FIG. 12 is a side view of a drill according to a second embodiment of the present invention.

[Explanation of symbols]

 1,11 drill 2,12 shank part 3,13 cutting edge part 4,14 cutting edge part 15 air hole 21 drilling machine 22 table 23 column 24 tool spindle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Morimoto 130 Rokujizo, Ritto-cho, Kurita-gun, Shiga Prefecture Mitsubishi Heavy Industries, Ltd. Kyoto Seiki Co., Ltd.

Claims (9)

[Claims] 1. A high-speed tool steel comprising substantially (Ti _(1-x) Al _x ) (N _y C _(1-y) ) wherein 0.3 ≦ x ≦ 0.8 0.6 ≦ y ≦ 1.0 A drill characterized in that at least one film is coated. (2) In the high-speed tool steel, (Ti _(1-x) Al _x ) _(1-w) (N _y C _(1-y) ) _w where 0.3 ≦ x ≦ 0.8 0.6 ≦ A drill coated with at least one film having a composition of y ≦ 1.0 0.45 ≦ w ≦ 0.55. 3. The high-speed tool steel according to claim 1, wherein the nitride-forming element is M, and (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C _(1-y) ) _w However, a drill characterized in that at least one layer of a film having a composition of 0.3 ≦ x ≦ 0.8 0.6 ≦ y ≦ 1.0 0.2 ≦ z ≦ 0.7 0.7 ≦ (z + x) <1.0 0.45 ≦ w ≦ 0.55 is coated. 4. A drilling method using the drill according to any one of claims 1 to 3 to perform drilling by dry cutting without using a cutting fluid. 5. The drilling method according to claim 4, wherein the drilling is performed by blowing air to the cutting portion. 6. A high-speed tool steel comprising substantially (Ti _(1-x) Al _x ) (N _y C _(1-y) ) wherein 0.3 ≦ x ≦ 0.8 0.6 ≦ y ≦ 1.0 A drilling machine characterized in that a drill coated with at least one layer of film is attached to a tool spindle which is driven toward and away from a workpiece and which is driven and rotated. 7. A high-speed tool steel comprising: (Ti _(1-x) Al _x ) _(1-w) (N _y C _(1-y) ) _w where 0.3 ≦ x ≦ 0.8 0.6 ≦ A drilling machine characterized in that a drill coated with a film having a composition of y ≦ 1.0 0.45 ≦ w ≦ 0.55 at least one layer is attached to a tool spindle which is driven toward and away from a workpiece and is driven and rotated. 8. In a high-speed tool steel, the nitride forming element is M, and (Ti _z Al _x M _(1-zx) ) _(1-w) (N _y C _(1-y) ) _w However, a drill coated with at least one layer of a film having the composition of 0.3 ≤ x ≤ 0.8 0.6 ≤ y ≤ 1.0 0.2 ≤ z ≤ 0.7 0.7 ≤ (z + x) <1.0 0.45 ≤ w ≤ 0.55 is moved toward and away from the work. A drilling machine characterized by being attached to a tool spindle that rotates and drives. 9. A drilling apparatus according to claim 6, further comprising an air supply means for blowing air to the cutting portion.