Hard coating film for cutting tool

Abstract

The purpose of the present invention is to provide a hard coating film cutting tool having excellent solder resistance and wear resistance. In order to achieve the purpose, the cutting tool provided by the invention is provided with a hard coating film, wherein: a first macroscopic roughness (macroscopic SaR1) of the macroscopic surface roughness when the surface roughness of the hard coating film is measured within 100 [mu] m from the cutting edge of the hard coating film in the rake face direction may be smaller than a second macroscopic roughness (macroscopic SaR1) of the macroscopic surface roughness when the surface roughness is measured outside 100 [mu] m from the cutting edge in the rake face direction ( macroscopic SaR2); a first microscopic roughness (microscopic SaR1) of the microscopic surface roughness when the surface roughness is measured within 100 [mu] m from the cutting edge in the rake face direction may be smaller than a second microscopic roughness (microscopic SaR2) of the microscopic surface roughness when the surface roughness is measured outside 100 [mu] m from the cutting edge in the rake face direction; a third macroscopic roughness (macroscopic SaF1) of the macroscopic surface roughness when the surface roughness is measured within 100 [mu] m from the cutting edge in the flank direction may be smaller than a fourth macroscopic roughness (macroscopic SaF2) of the macroscopic surface roughness when the surface roughness is measured outside 100 [mu] m from the cutting edge in the rake direction; and a third microscopic roughness (microscopic SaF1) of the microscopic surface roughness when the surface roughness is measured within 100 [mu] m from the cutting edge in the flank direction may be smaller than a fourth microscopic roughness (microscopic SaF2) of the microscopic surface roughness when the surface roughness is measured outside 100 [mu] m from the cutting edge in the rake direction.

Description

Technical Field

[0001] The present invention relates to a hard coating for a cutting tool, and more particularly to a hard coating having different roughnesses within an inner range and an outer range centered at a predetermined distance from a cutting edge of the hard coating. Background Art

[0002] In order to improve the cutting performance and extend the life of cutting tools when processing materials with high hardness of 50 or more according to the HRC standard (such as high-hardness steel) and difficult-to-cut materials that cause severe adhesion and chipping, a technology of using hard coatings made of various ceramics on hard substrates (such as cemented carbide, cermets, end mills or drills) is being adopted.

[0003] The hard coating formed on the hard substrate by deposition technology has the risk of peeling due to the difference in lattice constant between the hard substrate and the hard coating and the characteristics of the physical vapor deposition method, which increases the stress of the hard coating. In order to solve this problem, the adhesion of the hard coating has been improved through pretreatment, etching, adhesion layer, thin film with multilayer structure and post-treatment technology.

[0004] When processes such as pretreatment and etching are applied, the specific surface area of ​​the hard substrate surface can be increased to improve the adhesion between the substrate and the film. However, depending on the material to be cut, especially in stainless steel and Inconel cutting, the increase in specific surface area may lead to an increase in weldability between the film and the material to be cut, thereby deteriorating the life of the tool due to the tearing of the hard coating.

[0005] In order to solve this problem, in the related art, a post-treatment process of the hard coating has been applied to reduce the surface roughness of the tool, thereby improving lubricity. However, despite these efforts, there are limitations in improving the roughness by the post-treatment process of the hard coating, and there are disadvantages in manufacturing efficiency due to the additional process. In addition, even under the processing conditions of the hard substrate state after the hard coating is peeled off, since the specific surface area of ​​the hard substrate is still high, the weldability increases, thereby causing the problem of reduced tool life, so this problem must be solved. However, if the specific surface area of ​​the hard substrate is excessively reduced, the adhesion between the hard substrate and the hard coating may be reduced, thereby accelerating the peeling of the film. Summary of the invention

[0006] [Technical issues]

[0007] An object of the present invention is to provide a hard-coated cutting tool having excellent welding resistance and wear resistance.

[0008] [Technical solution]

[0009] In order to achieve the above object, the present invention provides a cutting tool comprising a hard coating, wherein in the hard coating, when the surface roughness is measured in a range of 100 μm from the cutting edge of the hard coating along the rake face direction, the first macroscopic surface roughness (macroscopic S aR1 ) is less than the second macroscopic surface roughness (macroscopic S) when the surface roughness is measured at a distance of 100 μm from the cutting edge in the rake face direction. aR2 ), the first microscopic roughness (microscopic S) of the microscopic surface roughness when the surface roughness is measured within a range of 100 μm along the rake face direction from the cutting edge aR1 ) is less than the second microscopic roughness (microscopic S) of the microscopic surface roughness when the surface roughness is measured beyond 100 μm from the cutting edge in the rake face direction. aR2 ), the third macroscopic surface roughness (macroscopic S aF1 ) is less than the fourth macroscopic surface roughness (macroscopic S) of the macroscopic surface roughness when the surface roughness is measured beyond 100 μm from the cutting edge in the rake face direction. aF2 ), and a third microscopic roughness (microscopic S) of the microscopic surface roughness when the surface roughness is measured within 100 μm from the cutting edge in the flank direction aF1 ) is less than the fourth microscopic roughness (microscopic S) of the microscopic surface roughness when the surface roughness is measured beyond 100 μm from the cutting edge in the rake face direction. aF2 ).

[0010] In addition, in the cutting tool of the present invention, the first macro-roughness (macro S aR1 ) can be in 0.1μm≤macro S aR1 ≤0.3 μm, the first microscopic roughness (microscopic S aR1 ) can be used in microscopic S aR1 ≤0.2μm, the second macroscopic roughness (macroscopic S aR2 ) can be in 0.2μm≤macro S aR2 ≤0.4μm, the second microscopic roughness (microscopic S aR2 ) can be in the microscopic S aR1 ≤0.25 μm, the third macroscopic roughness (macroscopic S aF1 ) can be used in 0.15μm≤macro S aF1 ≤0.35μm, the third microscopic roughness (microscopic S aF1 ) can be in the microscopic S aR1≤0.25 μm, the fourth macro-roughness (macro S aF2 ) can be in 0.25μm≤macro S aR2 ≤0.5μm, the fourth microscopic roughness (microscopic S aF2 ) can be in the micro S of 0.15μm≤ aR1 In the range of ≤0.35μm.

[0011] Furthermore, in the cutting tool of the present invention, the first to fourth macro-roughnesses and the first to fourth micro-roughnesses may gradually increase as the distance from the cutting edge becomes greater.

[0012] Furthermore, in the cutting tool of the present invention, the hard coating film may have a composition satisfying the following Chemical Formula 1, and may be provided as one or more layers.

[0013] [Chemical formula 1]Al (1-a-b-c) Ti a Cr b Me c N (0≤a≤0.6, 0≤b≤0.5, 0≤c≤0.15, and contains at least one of Ti and Cr, and Me is at least one of Ta, Hf, Nb, Zr, V, Y, W, Mo, Si or B)

[0014] Furthermore, in the cutting tool of the present invention, the thickness of the hard coating may be in the range of 0.02 μm to 20 μm.

[0015] [Beneficial Effects]

[0016] According to the present invention, a cutting tool having excellent hard coating adhesion and excellent welding resistance can be provided. In addition, process efficiency can be improved when manufacturing a cutting tool provided with a hard coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional view for explaining the cutting tool having a hard coating according to the present invention.

[0018] Figure 2 It is a schematic diagram for explaining the macroscopic roughness and microscopic roughness in the hard coating film of the present invention. DETAILED DESCRIPTION

[0019] Hereinafter, detailed description related to well-known functions or configurations will be excluded to avoid unnecessary obscurity of the subject matter of the present invention. In addition, when described as including some elements, it should be understood that it can only include these elements, or, if there is no specific limitation, it can include these elements and other elements.

[0020] The hard coating cutting tool of the present invention may include a hard substrate and a hard coating formed on the hard substrate. In the hard coating, when the surface roughness is measured in the range of 100 μm from the cutting edge of the hard coating along the rake face direction, the macroscopic surface roughness is referred to as the first macroscopic roughness (macroscopic S aR1 ), when the surface roughness is measured from the cutting edge along the rake face at a distance of 100 μm, the macroscopic surface roughness is called the second macroscopic roughness (macroscopic S aR2 ), when the surface roughness is measured within a range of 100 μm along the rake face from the cutting edge, the microscopic surface roughness is called the first microscopic roughness (microscopic S aR1 ), when the surface roughness is measured from the cutting edge along the rake face at a distance of 100 μm, the microscopic surface roughness is called the second microscopic roughness (microscopic S aR2 ), when the surface roughness is measured within a range of 100 μm from the cutting edge along the flank direction, the macroscopic surface roughness is called the third macroscopic roughness (macroscopic S aF1 ), when the surface roughness is measured from the cutting edge along the rake face at a distance of 100 μm, the macroscopic surface roughness is called the fourth macroscopic roughness (macroscopic S aF2 ), when the surface roughness is measured within a range of 100 μm from the cutting edge along the flank direction, the microscopic surface roughness is called the third microscopic roughness (microscopic S aF1 ), and when the surface roughness is measured beyond 100 μm from the cutting edge in the rake face direction, the microscopic surface roughness is called the fourth microscopic roughness (microscopic S aF2 ), the first macro-roughness is smaller than the second macro-roughness, the first micro-roughness is smaller than the second micro-roughness, the third macro-roughness is smaller than the fourth macro-roughness, and the third micro-roughness is smaller than the fourth micro-roughness.

[0021] The roughness of the hard coating may be significantly affected by the roughness of the substrate. When the roughness of the substrate is high, the bonding strength between the hard coating and the substrate increases, but there is a problem of increased possibility of welding with the material to be processed. In order to reconcile the contradictory relationship in the characteristics of the hard coating according to the roughness of the hard coating, the hard coating of the present invention may have a low surface roughness in the portion close to the center of the cutting edge to improve welding resistance, and to uniformly nucleate and grow in the hard coating, thereby relieving stress and improving resistance to chipping of intermittent impacts during cutting. In addition, the hard coating on the area away from the center of the cutting edge may have a higher surface roughness than the hard coating at the center of the cutting edge, thereby improving the higher bonding strength of the hard coating. When considering that peeling and tearing of the hard coating seriously occur during cutting, especially in the portion more than 100 μm away from the cutting edge, a suitable surface roughness is provided in the portion, thereby maintaining a high bonding force between the substrate and the hard coating, and providing sufficient peeling resistance.

[0022] For this reason, the macro-roughness of the area within 100 μm from the cutting edge center on both the rake face and the flank face is smaller than the macro-roughness of the area outside 100 μm from the cutting edge center. Similarly, the micro-roughness of the area within 100 μm from the cutting edge center is smaller than the micro-roughness of the area outside 100 μm from the cutting edge center.

[0023] In this specification, roughness means the arithmetic mean height as specified in ISO 25178. Roughness is usually expressed by adopting one of the multiple parameters specified in ISO 4287 and ISO 25178. However, since only the parameters cannot distinguish the overall shape change of the surface, it is easy to make mistakes when expressing the roughness. For example, cemented carbide is manufactured by a process of mixing, pressing and liquid-phase sintering hard particles and binder powder. During the sintering process, the binder is liquefied and then solidified again, thereby providing irregularly fluctuating roughness on the hard substrate. Hard particles with angular polygonal shapes are fixed on the binder and protrude irregularly along the surface, thereby showing fine roughness. Therefore, in order to more accurately measure the surface roughness of hard substrates such as cemented carbide and cermet, it is necessary to distinguish between the macroscopic roughness representing the roughness including the overall shape change of the surface and the microscopic roughness representing the roughness caused by the hard particles protruding from each other along the surface. In order to measure the macroscopic roughness and microscopic roughness respectively, a microscopic 3D roughness measuring device and analysis software using laser confocal and white light interferometer were used. In the present invention, Keyence's VK-X3050 device and its own analysis software were used. In this specification, macroscopic roughness means the arithmetic mean height displayed without any additional correction after measurement, and microscopic roughness means the arithmetic mean height after irregular fluctuations or large-scale components are removed by using the correction function (L filter) of the analysis software after measurement. Correction means correction performed using a filter corresponding to the cutoff value specified in JIS B0633-2001.

[0024] Reference Figure 1 and Figure 2 Describe the surface roughness of each area. On the front cutting edge 20, the macro-roughness and micro-roughness in the range 21 within 100 μm centered on the cutting edge 40 are smaller than the macro-roughness and micro-roughness in the range 22 outside 100 μm centered on the cutting edge 40. On the back cutting edge 30, the macro-roughness and micro-roughness in the range 31 within 100 μm centered on the cutting edge 40 are smaller than the macro-roughness and micro-roughness in the range 32 outside 100 μm centered on the cutting edge 40.

[0025] The macro-roughness and micro-roughness are shown in Figure 2 middle. Figure 2 (a) shows the surface roughness in the range 21 and 31 within 100 μm from the cutting edge 40, and Figure 2 (b) shows the surface roughness in the range 22 and 32 outside the cutting edge 40 at a distance of 100 μm. The dotted line represents the macroscopic roughness, and the solid line represents the microscopic roughness. Figure 2 (a) and Figure 2As shown in (b), the surface roughness in the ranges 21 and 31 within 100 μm from the cutting edge 40 is smaller than the macro-roughness and micro-roughness in the ranges 22 and 32 outside 100 μm.

[0026] In the cutting tool of the present invention, the first macroscopic roughness S aR1 Can be 0.1μm≤macro S aR1 ≤0.3μm, the first microscopic roughness microscopic S aR1 Can be 0.05μm≤micro S aR1 In the range of ≤0.2μm, the second macroscopic roughness macroscopic S aR2 Can be 0.2μm≤macro S aR2 ≤0.4μm, the second microscopic roughness microscopic S aR2 It can be used in microscopic S aR1 ≤0.25μm, the third macro roughness macro S aF1 Can be 0.15μm≤macro S aF1 ≤0.35μm, the third microscopic roughness microscopic S aF1 It can be used in microscopic S aR1 ≤0.25μm, and the fourth macroscopic roughness macroscopic S aF2 Can be 0.25μm≤macro S aR2 ≤0.5μm, and the fourth microscopic roughness microscopic S aF2 Can be 0.15μm≤ micro S aR1 In the range of ≤0.35μm.

[0027] The first to fourth macro-roughnesses and the first to fourth micro-roughnesses are comparable to each other, and a certain range of surface roughnesses can harmonically maintain adhesion, chipping resistance, and bonding strength of the hard coating.

[0028] To this end, on the front cutting edge, the first macro-roughness may be smaller than the second macro-roughness, furthermore, the first macro-roughness may be in the range of 0.1 μm to 0.3 μm, and the second macro-roughness may be in the range of 0.2 μm to 0.4 μm. On the back cutting edge, the third macro-roughness may be smaller than the fourth macro-roughness, furthermore, the third macro-roughness may be in the range of 0.15 μm to 0.35 μm, and the fourth macro-roughness may be in the range of 0.25 μm to 0.5 μm.

[0029] In addition, on the front cutting edge, the first micro-roughness may be smaller than the second micro-roughness, and further, the first micro-roughness may be in the range of 0.05 μm to 0.2 μm, and the second micro-roughness may be in the range of 0.1 μm to 0.25 μm. On the back cutting edge, the third micro-roughness may be smaller than the fourth micro-roughness, and further, the third micro-roughness may be in the range of 0.1 μm to 0.25 μm, and the fourth micro-roughness may be in the range of 0.15 μm to 0.35 μm.

[0030] If the macro-roughness is less than a certain range, the bonding strength of the hard coating may be problematic, and if it exceeds the range, there is a problem of reduced adhesion and chipping resistance. For this reason, the first and third macro-roughnesses need to be smaller than the second and fourth macro-roughnesses, respectively, and further, can be maintained within a certain range.

[0031] The reason why the roughness range on the flank face is larger than that on the rake face is that the hard coating needs to have slightly greater adhesion on the flank face. On the rake face, chip welding occurs in the process of machined chips being swept away for discharge, and the hard coating is also torn off when the chips are removed, so suppressing chip welding itself is a top priority. On the flank face, wear and tear actively occur due to close contact with the material to be cut, so the adhesion of the hard coating is more valued together with wear resistance.

[0032] In the hard coating of the cutting tool of the present invention, the first to fourth macro-roughnesses and the first to fourth micro-roughnesses may gradually increase as the distance from the cutting edge becomes greater.

[0033] The surface roughness decreases toward the center of the cutting edge for adhesion and chipping resistance, and gradually increases toward the center of the cutting edge, thereby ensuring the bonding strength between the hard coating and the substrate.

[0034] In the cutting tool of the present invention, the hard coating film may have a composition satisfying the following Chemical Formula 1, and may be provided in one or more layers.

[0035] [Chemical formula 1]Al (1-a-b-c) Ti a Cr b Me c N (0≤a≤0.6, 0≤b≤0.5, 0≤c≤0.15, and contains at least one of Ti and Cr, and Me is at least one of Ta, Hf, Nb, Zr, V, Y, W, Mo, Si or B)

[0036] It is known that a nitride film containing Al and Ti or Cr has excellent wear resistance, heat resistance, and chipping resistance. The hard coating may contain any one of Ta, Hf, Nb, Zr, V, Y, W, Mo, Si, and B in addition to Al, Ti, and Cr. By adjusting these metal elements, the wear resistance, chipping resistance, and heat resistance of the hard coating can be greatly improved.

[0037] In the hard coating film, reference marks a, b and c can determine the composition ratio of the metal elements Al, Ti, Cr and Me. When the composition of Al is high, wear resistance, oxidation resistance and lubricity are better, but when the Al content is too high, there is a problem of increased cracking, so it is preferred that the contents of Ti and Cr satisfy the following chemical formula: 0≤a≤0.6 and 0≤b≤0.5.

[0038] Other elements, such as Ta and Hf, can improve the chipping resistance, heat resistance and wear resistance of the hard coating by adding them, but if the content is high, it will cause an increase in residual stress due to an increase in the amorphous phase. Therefore, it is preferred that the content of Me, one of the other elements, is 0 to 0.15.

[0039] Furthermore, in the cutting tool of the present invention, the thickness of the hard coating may be in the range of 0.02 μm to 20 μm. If the thickness of the hard coating is less than 0.02 μm, it is difficult to provide sufficient wear resistance, and if it exceeds 20 μm, internal stress increases, thereby actually increasing chipping.

[0040] Embodiments of the present invention

[0041] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein.

[0042] [Example]

[0043] Manufacturing of hard coatings

[0044] A polishing process is applied to a hard substrate made of cemented carbide after a micro-sandblasting honing process or a diamond brush honing process, and then a hard film is formed using arc ion plating which is a physical vapor deposition (PVD) method.

[0045] In the polishing process of the hard substrate, a slurry containing diamond particles each having a size of 1 μm to 5 μm is used, and arc targets of TiAl, AlCr, TiAlSi, and AlCrSi are used as targets for applying the hard coating.

[0046] The hard substrate was wet microblasted and washed with ultrapure water, and then mounted on a rotary table at a predetermined distance from the central axis along the periphery in a dry coating state. The initial vacuum pressure in the coating chamber was reduced to 8.5 × 10 - 5 The substrate is heated to 400 to 600°C and a pulse bias of -400 to -200 V is applied to the substrate rotating on a rotating table in an Ar gas atmosphere to perform ion bombardment for 30 to 90 minutes. The gas pressure for coating is maintained at 50 mTorr or less, preferably 40 mTorr or less to form a film.

[0047] In more detail, TiAl, AlCr, TiAlSi and AlCrSi targets are used to form films by injecting N2 as a reaction gas under the conditions of a bias voltage of -100V to -30V, an arc current of 100A to 150A and a pressure of 20mtorr to 40mtorr, and the coating conditions can vary depending on the equipment characteristics and conditions.

[0048] Films were manufactured under the above conditions according to the comparative examples and embodiments of the present invention, and as shown in Comparative Examples 1 to 2 and Embodiment 1, hard coatings with a thickness of 3.0 μm to 3.5 μm were formed using TiAl (composition ratio 50:50) and TiAlSi (composition ratio 30:60:10) targets, and as shown in Comparative Examples 4 to 5 and Embodiment 2, hard coatings with a thickness of 3.5 μm to 4.0 μm were formed using TiAl (composition ratio 50:50), AlCr (composition ratio 70:30) and AlCrSi (composition ratio 60:30:10) targets. The macroscopic surface roughness S of the corresponding rake face and flank face within 100 μm from the cutting edge was 2.3 μm. a and microscopic surface roughness S a The information is shown in Table 1 below.

[0049] Table 1

[0050]

[0051] As shown in Table 1 above, Examples 1 and 2 have lower overall roughness when compared to Comparative Examples 1 and 3, and higher overall roughness when compared to Comparative Examples 2 and 4. In addition, the roughness value within 100 μm from the cutting edge is lower than the roughness value outside 100 μm.

[0052] Cutting performance evaluation

[0053] In order to evaluate the adhesion, peeling resistance, and chipping resistance of the cutting tools manufactured as shown in Table 1 above, a milling test was conducted, and the evaluation was performed under the following conditions.

[0054] 1) Evaluation of welding resistance and chipping resistance

[0055] Material to be cut: GCD600

[0056] Sample type: SNMX1206ANN-MF (Comparative Examples 1 to 2, Example 1)

[0057] Cutting speed: 150m / min

[0058] Cutting transfer: 0.2mm / tooth

[0059] Cutting depth: 2mm

[0060] When machining ductile iron, the main types of wear are usually mechanical friction wear and tear, and chipping and tearing caused by repeated adhesion and shedding of chips. The adhesion and chipping resistance of the cutting tool has a significant impact on the cutting performance.

[0061] (2) Evaluation of peeling resistance and chipping resistance

[0062] Material to be cut: STD11

[0063] Sample type: ADKT170608PESR-MM (Comparative Examples 3 to 4, Example 2)

[0064] Cutting speed: 120m / min

[0065] Cutting transfer: 0.2mm / tooth

[0066] Cutting depth: 5mm

[0067] When machining high hardness steel, the main types of wear are usually excessive wear and chipping caused by tearing, and the peeling and chipping resistance of the cutting tool has a significant impact on the cutting performance.

[0068] [Table 2]

[0069]

[0070] As shown in Table 2 above, the cutting tools of the examples have better overall cutting performance when compared with the cutting tools of the comparative examples. In the case of Comparative Examples 2 and 4, the roughness of the cutting tools is the lowest, but the adhesion between the hard substrate and the hard coating film is reduced, thereby reducing the tool life. Therefore, as shown in the examples, it was confirmed that by making each part of the cutting tool have an appropriate roughness range, the adhesion resistance, peeling resistance and chipping resistance are improved, and the tool life is improved with stable processing in the form of normal wear.

Claims

1. A cutting tool comprising a hard substrate and a hard coating film disposed on the hard substrate, in, In the hard coating film, the first macroscopic roughness (macroscopic S aR1 ) is smaller than the second macroscopic roughness (macroscopic S aR2 ), the first macro-roughness is the macro-surface roughness when the surface roughness is measured within 100 μm from the cutting edge of the hard coating along the rake face direction, and the second macro-roughness is the macro-surface roughness when the surface roughness is measured beyond 100 μm from the cutting edge along the rake face direction; The first microscopic roughness (microscopic S aR1 ) is less than the second microscopic roughness (microscopic S aR2 ), the first micro-roughness is the micro-surface roughness when the surface roughness is measured within 100 μm from the cutting edge along the rake face direction, and the second micro-roughness is the micro-surface roughness when the surface roughness is measured beyond 100 μm from the cutting edge along the rake face direction; The third macroscopic roughness (macroscopic S aF1 ) is less than the fourth macroscopic roughness (macroscopic S aF2 ), the third macro-roughness is the macro-surface roughness when the surface roughness is measured within 100 μm from the cutting edge along the flank direction, and the fourth macro-roughness is the macro-surface roughness when the surface roughness is measured beyond 100 μm from the cutting edge along the rake direction; and The third micro-roughness (micro-S aF1 ) is less than the fourth microscopic roughness (microscopic S aF2 ), the third micro-roughness is the micro-surface roughness when the surface roughness is measured within 100 μm from the cutting edge along the back tool face direction, and the fourth micro-roughness is the micro-surface roughness when the surface roughness is measured outside 100 μm from the cutting edge along the front tool face direction.

2. The cutting tool according to claim 1, wherein: The first macroscopic roughness (macroscopic S aR1 ) in 0.1μm≤macro S aR1 ≤0.3 μm, the first microscopic roughness (microscopic S aR1 ) in 0.05μm≤micro S aR1 ≤0.2μm, the second macroscopic roughness (macroscopic S aR2 ) in 0.2μm≤macro S aR2 ≤0.4μm, the second microscopic roughness (microscopic S aR2 ) in 0.1μm≤micro S aR1 ≤0.25 μm, the third macroscopic roughness (macroscopic S aF1 ) in 0.15μm≤macro S aF1 ≤0.35μm, the third microscopic roughness (microscopic S aF1 ) in 0.1μm≤micro S aR1 ≤0.25 μm, the fourth macro-roughness (macro S aF2 ) in 0.25μm≤macro S aR2 ≤0.5μm, the fourth microscopic roughness (microscopic S aF2 ) in 0.15μm≤micro S aR1 In the range of ≤0.35μm.

3. The cutting tool according to claim 1, wherein: The first macro-roughness to the fourth macro-roughness and the first micro-roughness to the fourth micro-roughness gradually increase as the distance from the cutting edge becomes farther.

4. The cutting tool according to claim 1, wherein: The hard coating film has a composition satisfying the following chemical formula 1 and is provided as one or more layers, [Chemical formula 1] To the (1-a-b-c) You a Cr b Me c N Wherein, 0≤a≤0.6, 0≤b≤0.5, 0≤c≤0.15, and at least one of Ti and Cr is contained, and Me is at least one of Ta, Hf, Nb, Zr, V, Y, W, Mo, Si or B.

5. The cutting tool according to claim 1, wherein: The hard coating film has a thickness in the range of 0.02 μm to 20 μm.

Images