JP2007075930A - Surface coated cermet throw-away tip for rotating cutting tool having hard coated layer exerting excellent chipping resistance in high speed cutting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throw-away tip for a rotating cutting tool exerting excellent chipping resistance in high speed cutting. <P>SOLUTION: In this throw-away tip, a hard coated layer having lower part layers of Ti compound layers and upper part layers of Al<SB>2</SB>O<SB>3</SB>layers is formed on a surface of a tip substrate. One layer of the Ti compound layers is made of a reformed TiCN layer showing an inclined angle frequency distribution graph in which each peak exists in inclined angle divisions within the range of 0 to 10° and 25 to 35° and the total of frequencies existing in each of the range of 0 to 10° and 25 to 35° occupies 35 to 45%, in the inclined angle frequency distribution graph made by measuring an inclined angle formed by a normal line of a ä112} plane to be a crystalline plane of crystal grain by using a field emission type scanning electron microscope, by dividing the measured inclined angles within the range of 0 to 45° for every pitch of 0.25° of the measured inclined angles, and by totalizing frequencies existing in each division. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a throwaway tip (hereinafter referred to as a coated tip) made of a surface-coated cermet for a rotary cutting tool that exhibits excellent chipping resistance with a hard coating layer, particularly in high-speed cutting of steel or cast iron.

Conventionally, in general, as a rotary cutting tool, as shown in FIG. 4A, a half vertical side view, a front milling tool shown in FIG. There is known a throwaway end mill shown in the front view of the head in (b), and these rotary cutting tools are detachable with a plurality of coated tips at a predetermined interval on the front part of the tool body as shown in the figure. It is also well known that it is used for cutting such as plane cutting, grooving, shouldering, counterbore, and drilling.
Furthermore, the above-mentioned coated chip is formed on the surface of a chip base composed of tungsten carbide (hereinafter referred to as WC) based cemented carbide or titanium carbonitride (hereinafter referred to as TiCN) based cermet.
(A) Titanium carbide (hereinafter referred to as TiC) layer, titanium nitride (hereinafter referred to as TiN) layer, titanium carbonitride (hereinafter referred to as TiCN) layer, carbonic acid carbonate, all of which are formed by chemical vapor deposition. A Ti compound layer composed of two or more of a titanium carbide (hereinafter referred to as TiCO) layer and a titanium carbonitride oxide (hereinafter referred to as TiCNO) layer and having a total average layer thickness of 3 to 20 μm,
(B) an aluminum oxide (hereinafter referred to as Al ₂ O ₃ ) layer formed by chemical vapor deposition in which the upper layer has an average layer thickness of 1 to 15 μm;
It is also known that the hard coating layer composed of (a) and (b) is formed.
Japanese Unexamined Patent Publication No. 6-31503

In recent years, there has been a remarkable improvement in the performance of cutting devices. On the other hand, there are strong demands for labor saving and energy saving and further cost reduction for cutting, and with this, cutting has been on the trend of higher speed. In the conventional coated chip, there is no problem when it is used under normal cutting conditions, but in particular, the cutting speed is 300 m / min. When used under high-speed cutting conditions exceeding the above, the hard coating layer constituting this has high temperature strength due to the Ti compound layer of the lower layer, high temperature hardness and heat resistance due to the Al ₂ O ₃ layer of the same upper layer, Since the high temperature strength due to the Ti compound layer is insufficient, chipping (minute chipping) is likely to occur in the hard coating layer, so that the service life is reached in a relatively short time.

In view of the above, the present inventors pay attention to the TiCN layer of the Ti compound layer, which is the lower layer, in order to improve the chipping resistance of the hard coating layer constituting the coated chip from the above viewpoint. As a result of research,
(A-1) Usually, a TiCN layer (hereinafter referred to as a conventional TiCN layer) constituting a Ti compound layer that is a lower layer of the hard coating layer of the conventional coated chip is a normal chemical vapor deposition apparatus,
Reaction gas composition - by _{volume%, TiCl 4: 2~10%,} CH 3 CN: 0.5~3%, N 2: 10~30%, H 2: remainder,
Reaction atmosphere temperature: 850-950 ° C.
Reaction atmosphere pressure: 3 to 13 kPa,
However, prior to forming the conventional TiCN layer,
(A-2) In the same normal chemical vapor deposition apparatus,
Reaction gas composition - by _{volume%, TiCl 4: 0.2~1%,} C 3 H 6 ( _{methylethylene): 1~5%, N 2:} 20~40%, H 2: remainder,
Reaction atmosphere temperature: 700 to 800 ° C.
Reaction atmosphere pressure: 3 to 13 kPa,
Processing time: 0.5-1 hour,
Under the conditions, TiCN crystal nuclei are formed in a state of being distributed and distributed on the layer forming surface. In this case, the dispersion ratio of the TiCN crystal nuclei is observed at a magnification of 10,000 using a scanning electron microscope, The average value is 80 to 150 / μm ² ,
(A-3) When a TiCN layer is formed on the surface where the TiCN crystal nuclei are present under the same conditions as the conventional TiCN layer, the resulting TiCN layer (hereinafter referred to as a modified TiCN layer) When the layer is formed, the TiCN crystal nuclei are significantly affected by the crystal arrangement, and the layer formation is performed while sufficiently recording the history.

(B) Using the field emission scanning electron microscope, the conventional TiCN layer and the modified TiCN layer are within the measurement range of the surface polished surface as shown in the schematic explanatory diagrams of FIGS. 1 (a) and 1 (b). An electron beam is irradiated to each of the crystal grains having a cubic crystal lattice, and an inclination angle formed by a normal of the {112} plane that is a crystal plane of the crystal grain is set with respect to a normal of the surface polished surface. Measured and divided the measured inclination angle within the range of 0 to 45 degrees among the measured inclination angles for each pitch of 0.25 degrees, and the number of inclination angles obtained by totalizing the frequencies existing in each section When a distribution graph is created, the conventional TiCN layer shows an unbiased inclination angle number distribution graph within the range of the measured inclination angle of the {112} plane within the range of 0 to 45 degrees as illustrated in FIG. In contrast, the modified TiCN layer is formed of Ti, as illustrated in FIG. By a ratio of 80 to 150 pieces / [mu] m ² in average the distribution ratio of the TiCN crystal nuclei formed prior to the N layer formation, in the range within and 25-35 degrees range of 0 degrees A peak exists in each tilt angle section, and the total frequency within the range of 0 to 10 degrees is 35 to 45% of the total frequency in the tilt angle frequency distribution graph, and within the range of 25 to 35 degrees. The inclination frequency distribution graph in which the total of the existing frequencies similarly accounts for 35 to 45% of the entire frequency in the inclination angle distribution graph.

(C) The coated chip in which the upper layer of the hard coating layer is composed of the Al ₂ O ₃ layer, the lower layer is composed of the Ti compound layer, and one of the Ti compound layers is composed of the modified TiCN layer, Since the modified TiCN layer has excellent high-temperature strength, the hard coating layer exhibits excellent chipping resistance even in high-speed cutting, and exhibits excellent wear resistance over a long period of time. To become.
The research results shown in (a) to (c) above were obtained.

The present invention has been made based on the above research results, and on the surface of a chip base composed of a WC-based cemented carbide or TiCN-based cermet,
(A) The lower layer is composed of two or more of a TiC layer, a TiN layer, a TiCN layer, a TiCO layer, and a TiCNO layer, all formed by chemical vapor deposition, and has a total average layer thickness of 3 to 20 μm. Ti compound layer,
(B) Al ₂ O ₃ layer formed by chemical vapor deposition with an upper layer having an average layer thickness of 1 to 15 μm,
In the coated chip formed by forming the hard coating layer composed of (a) and (b) above, one of the two or more Ti compound layers of (a) above is averaged at 2.5 to 15 μm. Having a layer thickness, and
Using a field emission scanning electron microscope, each crystal grain having a cubic crystal lattice existing within the measurement range of the surface polished surface is irradiated with an electron beam, and the crystal grain is normal to the surface polished surface. The tilt angle formed by the normal of the {112} plane, which is the crystal plane, is measured, and, among the measured tilt angles, the measured tilt angles within the range of 0 to 45 degrees are classified for each pitch of 0.25 degrees. In addition, in the inclination angle number distribution graph obtained by counting the frequencies existing in each section, peaks exist in the inclination angle sections in the range of 0 to 10 degrees and in the range of 25 to 35 degrees, respectively, and the 0 The sum of the frequencies existing within the range of 10 to 10 degrees is 35 to 45% of the entire frequencies in the tilt angle frequency distribution graph, and the total of the frequencies existing within the range of 25 to 35 degrees is the same as the tilt angle frequency distribution graph. 35-45% of the total frequency in Reformed TiCN layer indicating the inclination angle frequency distribution graph which accounts for engagement, in formed by arrangement, and it has the characteristics to the coating chip exhibits chipping resistance of the hard coating layer has excellent high-speed cutting.

Next, the reason why the constituent layers of the hard coating layer of the coated chip of the present invention are numerically limited as described above will be described below.
(A) Ti compound layer (lower layer)
The Ti compound layer itself has high-temperature strength, and the presence of this makes the hard coating layer have high-temperature strength, and firmly adheres to both the chip base and the upper Al ₂ O ₃ layer. Therefore, it has an effect of improving the adhesion of the hard coating layer to the chip substrate. However, if the total average layer thickness is less than 3 μm, the above-mentioned effect cannot be sufficiently exhibited, while the total average layer thickness is If it exceeds 20 μm, high-speed cutting with high heat generation tends to cause thermoplastic deformation, which causes uneven wear. Therefore, the total average layer thickness is set to 3 to 20 μm.

(B) Modified TiCN layer As described above, by modifying the distribution ratio of the TiCN crystal nuclei formed prior to the formation of the modified TiCN layer to an average value of 80 to 150 / μm ² , the modified TiCN layer is formed. The layer has peaks in the inclination angle sections in the range of 0 to 10 degrees and in the range of 25 to 35 degrees, respectively, and the total of the frequencies existing in the range of 0 to 10 degrees is an inclination angle number distribution. An inclination angle frequency distribution graph in which 35 to 45% of the entire frequency in the graph and a total of frequencies existing in the range of 25 to 35 degrees occupy a ratio of 35 to 45% of the entire frequency in the inclination angle distribution graph. is as shown, this results in excellent high-temperature strength are those so equipped, thus, or less than 80 / [mu] m ² at a distribution ratio of the TiCN crystal nuclei average value and the distribution split When There or exceed 150 / [mu] m ^2, or the inclination angle of appearance of two peaks fall outside the range, or no longer appear two peaks inclination angle frequency distribution graph, the ratio of the total power in addition within the range In such cases, the desired high strength cannot be obtained and chipping is likely to occur.
Also, if the average layer thickness is less than 2.5 μm, the hard coating layer cannot be provided with the desired excellent high-temperature strength. On the other hand, if the average layer thickness exceeds 15 μm, the thermoplastic deformation causing uneven wear will not occur. Since it tends to occur and wear accelerates, the average layer thickness was set to 2.5 to 15 μm.

(C) Al ₂ O ₃ layer (upper layer)
The Al ₂ O ₃ layer has excellent high-temperature hardness and heat resistance, and contributes to improving the wear resistance of the hard coating layer. However, if the average layer thickness is less than 1 μm, the hard coating layer has sufficient wear resistance. On the other hand, if the average layer thickness exceeds 15 μm and becomes too thick, chipping tends to occur. Therefore, the average layer thickness is set to 1 to 15 μm.

  In addition, for the purpose of identification before and after the use of the cutting tool, a TiN layer having a golden color tone may be vapor-deposited as necessary, but the average layer thickness in this case may be 0.1 to 1 μm, This is because if the thickness is less than 0.1 μm, a sufficient discrimination effect cannot be obtained, while the discrimination effect by the TiN layer is sufficient with an average layer thickness of up to 1 μm.

  This coated chip has a high temperature strength with a modified TiCN layer which is one of the lower layers of the hard coating layer, and exhibits excellent chipping resistance even in high-speed cutting. The layer exhibits excellent wear resistance without occurrence of chipping.

  Next, the coated cermet tool of the present invention will be specifically described with reference to examples.

WC powder, TiC powder, ZrC powder, VC powder, TaC powder, NbC powder, Cr ₃ C ₂ powder, TiN powder, TaN powder, and Co powder all having an average particle diameter of 0.5 to 3 μm as raw material powder These raw material powders are blended in the blending composition shown in Table 1, further added with wax, ball milled in acetone for 72 hours, dried under reduced pressure, and then pressed into a green compact with a predetermined shape at a pressure of 98 MPa. This green compact is press-molded and vacuum-sintered at a predetermined temperature in the range of 1370 to 1470 ° C. for 1 hour in a vacuum of 5 Pa. After sintering, grinding, grinding, rake face and flank face By applying honing of 0.12mm in width to the edge of the cutting edge that intersects, the face milling tool specified in ISO standard SEEN1203AFTN made of WC-base cemented carbide, and ISO Chip bases A to F for slow-away end mills specified in the standard · OEMX1705ETR were manufactured.

In addition, as raw material powders, TiCN (mass ratio TiC / TiN = 50/50) powder, Mo ₂ C powder, ZrC powder, NbC powder, TaC powder, WC powder, all having an average particle diameter of 0.5 to 2 μm. Co powder and Ni powder are prepared, and these raw material powders are blended in the blending composition shown in Table 2, wet mixed by a ball mill for 24 hours, dried, and pressed into a compact at a pressure of 98 MPa. The green compact is sintered in a nitrogen atmosphere of 1.3 kPa at a temperature of 1540 ° C. for 1 hour, and after the sintering, the grinding edge and the cutting edge edge line where the rake face and the flank face intersect. By applying honing to the width: 0.12 mm, it is for the face milling tool specified in ISO standard / SEEN1203AFTN made by TiCN base cermet, and ISO standard / OEMX 1705E. To form a chip substrate a~f for slow-away end mill as defined in R.

Next, each of these chip bases A to F and chip bases a to f is loaded into a normal chemical vapor deposition apparatus together with a test piece for measuring the TiCN crystal nucleus distribution ratio. First, the conditions shown in Table 3 are satisfied. Then, a Ti compound layer including a modified TiCN layer as a lower layer of the hard coating layer is vapor-deposited with a combination shown in Table 4 and with a target layer thickness. In this case, TiCN necessary for forming the modified TiCN layer is formed. The distribution ratio of crystal nuclei is determined by adjusting the processing time, and the TiCN crystal nucleus distribution ratio measurement specimen is taken out after the formation of TiCN crystal nuclei performed prior to the formation of the modified TiCN layer. under the conditions shown in Table 3, the combination also shown in Table 4 the Al ₂ O ₃ layer as an upper layer, and the present invention cover the chip 1 to 13 by depositing formed at the target layer thickness its Each was produced.
The above-mentioned test piece for measuring the TiCN crystal nucleus distribution ratio was observed at a magnification of 10,000 using a scanning electron microscope, and the number of TiCN crystal nuclei existing within a range of 3 μm × 3 μm was arbitrarily set to 5 Measurements were made at various points, and the measurement results are shown in Table 4 as an average value per unit area (μm 2).

  For comparison purposes, as shown in Table 6, it is the same except that a conventional TiCN layer having the target layer thickness shown in Table 6 is formed under the conditions shown in Table 3 instead of the modified TiCN layer. Conventionally coated chips 1 to 13 were produced under the conditions described above.

Subsequently, an inclination angle number distribution graph was created for each of the modified TiCN layer and the conventional TiCN layer constituting the hard coating layer of the present invention-coated chip and the conventional coated chip using a field emission scanning electron microscope.
That is, the tilt angle number distribution graph is set in a lens barrel of a field emission scanning electron microscope with the surfaces of the modified TiCN layer and the conventional TiCN layer being polished surfaces, and 70 ° on the polished surface. An electron backscatter diffraction imaging apparatus is irradiated by irradiating an electron beam with an acceleration voltage of 15 kV at an incident angle of 1 nA with an irradiation current of 1 nA on each crystal grain having a cubic crystal lattice existing within the measurement range of the surface polished surface. Using a 30 × 50 μm region at an interval of 0.1 μm / step, the inclination angle formed by the normal of the {112} plane, which is the crystal plane of the crystal grain, is measured with respect to the normal of the polished surface. Based on this measurement result, among the measured tilt angles, the measured tilt angles within the range of 0 to 45 degrees are divided for each pitch of 0.25 degrees, and the frequencies existing in each section are tabulated. Created by.

  In the gradient angle distribution graphs of the various modified TiCN layers and the conventional TiCN layers obtained as a result, the {112} plane has the highest peak, and the tilt angle within the range of 0 to 10 degrees. Tables 5 and 7 show the ratios of the existing inclination angle numbers to the inclination angle number of the entire inclination angle distribution graph, respectively.

In the various inclination angle distribution graphs described above, as shown in Tables 5 and 7, the modified TiCN layer of the coated chip of the present invention has a distribution of measured inclination angles on the {112} plane of 0 to 10 degrees. A peak appears in the inclination angle section in the range of 25 to 35 degrees, and the ratio of the number of inclination angles existing in the inclination angle sections in the range of 0 to 10 degrees and 25 to 35 degrees is 35 to 45%. In contrast to the graph showing the distribution of the number of inclination angles, the conventional TiCN layers of the conventional coated cermet tools are all unbiased in the range of the measured inclination angle of the {112} plane within the range of 0 to 45 degrees, and peaks are observed. The inclination angle number distribution graph which is not present and the ratio of the inclination angle numbers existing in the inclination angle sections in the range of 0 to 10 degrees and 25 to 35 degrees is 25% or less, respectively.
2 shows an inclination angle number distribution graph of the modified TiCN layer of the coated chip 3 of the present invention, and FIG. 3 shows an inclination angle number distribution graph of the conventional TiCN layer of the conventional coated chip 3.

Further, regarding the above-described coated chips 1 to 13 of the present invention and the conventional coated chips 1 to 13, the constituent layers of the hard coating layer were observed using an electron beam microanalyzer (EPMA) and an Auger spectrometer (longitudinal section of the layer) As a result, it was confirmed that both the former and the latter consisted of a Ti compound layer and an Al ₂ O ₃ layer having substantially the same composition as the target composition. Further, the thicknesses of the constituent layers of the hard coating layer of these coated chips were measured using a scanning electron microscope (same longitudinal section measurement), and all of them had an average layer thickness (5 The average value of point measurement) was shown.

(1) Next, regarding the face milling, six of the above-mentioned coated tips are attached to the front surface of the tool body having a diameter of 125 mm for each type,
(A) Work material: JIS / SCM440 plate material having dimensions of width: 100 mm × length: 1000 mm,
Rotational speed: 866 r. p. m. ,
Cutting speed: 340 m / min,
Incision (axial direction): 2.5 mm,
Feed per tooth: 0.2 mm / tooth,
Cutting time: 30 minutes,
Wet high-speed surface cutting test of alloy steel under the above conditions (called cutting condition A) (normal cutting speed is 160 m / min),
(B) Work material: JIS / S10C plate material having dimensions of width: 100 mm × length: 1000 mm,
Number of revolutions: 955 r. p. m. ,
Cutting speed: 375 m / min,
Incision (axial direction): 2.5 mm,
Feed per tooth: 0.2 mm / tooth,
Cutting time: 30 minutes,
Wet high-speed surface cutting test of carbon steel under the conditions (cutting condition B) (normal cutting speed is 200 m / min),
(C) Work material: JIS / FCD350 plate material having dimensions of width: 100 mm × length: 1000 mm,
Number of revolutions: 892 r. p. m. ,
Cutting speed: 350 m / min,
Incision (axial direction): 2.5 mm,
Feed per tooth: 0.2 mm / tooth,
Cutting time: 30 minutes,
A wet high-speed surface cutting test (normal cutting speed is 200 m / min) of ductile cast iron under the above conditions (referred to as cutting condition C),
(2) For end milling, three coated chips are attached to the front of the head having a diameter of 50 mm for each type.
(A) Work material: JIS / SCM440 plate material having dimensions of width: 100 mm × length: 1000 mm,
Rotational speed: 2038 r. p. m. ,
Cutting speed: 320 m / min,
Incision (axial direction): 5 mm,
Feed per tooth: 0.2 mm / tooth,
Cutting time: 15 minutes,
Wet high-speed grooving cutting test of alloy steel under the conditions (cutting condition D) (normal cutting speed is 200 m / min),
(B) Work material: JIS / S10C plate material having dimensions of width: 100 mm × length: 1000 mm,
Number of revolutions: 2166 r. p. m. ,
Cutting speed: 340 m / min,
Incision (axial direction): 5 mm,
Feed per tooth: 0.2 mm / tooth,
Cutting time: 15 minutes,
Wet high-speed grooving cutting test of carbon steel under the condition (cutting condition E) (normal cutting speed is 240 m / min),
(C) Work material: JIS / FCD350 plate material having dimensions of width: 100 mm × length: 1000 mm,
Rotational speed: 1911r. p. m. ,
Cutting speed: 300 m / min,
Cutting depth (axial direction): 5mm,
Feed per tooth: 0.2 mm / tooth,
Cutting time: 15 minutes,
Wet high-speed grooving cutting test (normal cutting speed is 200 m / min) of ductile cast iron under the above conditions (referred to as cutting condition F), and the maximum clearance of the coated chips used for each cutting test in any cutting test The surface wear width was measured. These measurement results are shown in Tables 8 and 9, respectively.

  From the results shown in Tables 4 to 9, all of the coated chips 1 to 13 of the present invention are such that one of the lower layers of the hard coating layer has a {112} plane inclination angle of 0 to 10 degrees and 25 to 35. A peak is shown in each inclination angle section within the range of degrees, and the total ratio of the frequencies existing in the inclination angle section range of 0 to 10 degrees and the frequencies existing in the inclination angle section range of 25 to 35 degrees It is composed of a modified TiCN layer showing an inclination angle number distribution graph that occupies 35 to 45% of each, and since it has excellent high temperature strength, it is attached to a rotary cutting tool to perform high speed cutting of steel and cast iron. In this case, the occurrence of chipping at the cutting edge portion is remarkably suppressed and excellent wear resistance is exhibited, whereas one of the lower layers of the hard coating layer has a measured inclination angle of the {112} plane. Range of 0 to 45 degrees In the conventional coated tips 1 to 13 composed of a conventional TiCN layer showing an inclination angle distribution graph in which no peak exists, all of them are cut off due to insufficient high-temperature strength of the hard coating layer in high-speed cutting. It is clear that chipping occurs at the blade and the service life is reached in a relatively short time.

  As described above, the coated tip of the present invention has excellent chipping resistance not only when it is attached to a rotary cutting tool and cutting is performed under normal conditions, but particularly at high speed cutting where high temperature strength is required. Since it exhibits excellent cutting performance over a long period of time, it can sufficiently satisfy the high performance of the cutting device, the labor saving and energy saving of the cutting work, and the cost reduction.

It is a schematic explanatory drawing which shows the measurement range of the inclination angle of the {112} plane of the crystal grain in the various TiCN layers which comprise a hard coating layer. It is an inclination angle number distribution graph of the {112} plane of the modified TiCN layer constituting the lower layer of the hard coating layer of the coated chip 3 of the present invention. 6 is a graph showing the distribution of the number of inclination angles of the {112} plane of conventional TiCN constituting the lower layer of the hard coating layer of the conventional coated chip 3. The front milling tool as a rotary cutting tool is shown, (a) is a half longitudinal section side view, (b) is a principal part enlarged side view. The slow-away end mill as a rotary cutting tool is shown, (a) is a side view, (b) is a head front view.

Claims (1)

On the surface of the chip substrate made of tungsten carbide based cemented carbide or titanium carbonitride based cermet,
(A) The lower layer is composed of two or more of a titanium carbide layer, a titanium nitride layer, a titanium carbonitride layer, a titanium carbonate layer, and a titanium carbonitride oxide layer formed by chemical vapor deposition, A Ti compound layer having a total average layer thickness of 20 μm,
(B) an aluminum oxide layer formed by chemical vapor deposition in which the upper layer has an average layer thickness of 1 to 15 μm;
In the throwaway tip made of surface-coated cermet for a rotary cutting tool formed by forming the hard coating layer constituted by (a) and (b) above,
One of the two or more Ti compound layers of (a) above has an average layer thickness of 2.5 to 15 μm, and
Using a field emission scanning electron microscope, each crystal grain having a cubic crystal lattice existing within the measurement range of the surface polished surface is irradiated with an electron beam, and the crystal grain is normal to the surface polished surface. The tilt angle formed by the normal of the {112} plane, which is the crystal plane, is measured, and, among the measured tilt angles, the measured tilt angles within the range of 0 to 45 degrees are classified for each pitch of 0.25 degrees. In addition, in the inclination angle number distribution graph obtained by counting the frequencies existing in each section, peaks exist in the inclination angle sections in the range of 0 to 10 degrees and in the range of 25 to 35 degrees, respectively, and the 0 The sum of the frequencies existing within the range of 10 to 10 degrees is 35 to 45% of the entire frequencies in the tilt angle frequency distribution graph, and the total of the frequencies existing within the range of 25 to 35 degrees is the same as the tilt angle frequency distribution graph. 35-45% of the total frequency in Titanium carbonitride layer indicates an inclination angle frequency distribution graph occupying the case,
A surface coated cermet throwaway tip for rotary cutting tools that exhibits excellent chipping resistance in high-speed cutting with excellent hard coating layer.

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