A coated cutting tool having a periodic surface structure and a method of making the same

Abstract

This application discloses a coated cutting tool with a periodic surface structure and its preparation method. The preparation method includes: S1: pretreating the cutting tool substrate; S2: constructing a surface structure with a periodic undulating morphology on the surface of the cutting tool substrate, wherein the horizontal periodicity of the surface structure is 50 nm-10 μm and the height is 50 nm-10 μm; S3: performing surface activation or etching treatment on the cutting tool substrate; S4: depositing a functional coating on the surface of the cutting tool substrate to obtain a coated cutting tool with a periodic surface structure. This application constructs a periodic surface structure on the surface of the cutting tool substrate, regulates the local surface energy state and interfacial atom adsorption behavior of the cutting tool substrate surface, achieves high-density stable nucleation and ordered growth induction in the early stage of coating deposition, realizes interface / substrate nucleation regulation, thereby improving the coating growth behavior, coating microstructure and interfacial bonding performance, and significantly improving the blade-film bonding strength.

Description

Technical Field

[0001] This application relates to the technical field of tool surface engineering and advanced manufacturing, and more specifically, to a coated tool with a periodic surface structure and a method for preparing the same. Background Technology

[0002] Coated cutting tools, due to their advantages such as high hardness, good wear resistance, high heat resistance, and strong anti-adhesion ability, have been widely used in the high-efficiency cutting of difficult-to-machine materials such as titanium alloys, high-temperature alloys, and stainless steel. Existing coated cutting tools typically employ physical vapor deposition (PVD) or chemical vapor deposition (CVD) to deposit wear-resistant coatings on the surface of cemented carbide, cermet, or high-speed steel substrates. However, with the increasing demands for tool reliability and machining efficiency in machining difficult-to-machine metals, high-performance cutting tools, represented by cemented carbide coated tools, are gradually revealing a series of key challenges: insufficient coating adhesion leading to coating peeling, low cutting edge strength, and other problems that severely restrict tool life and machining stability.

[0003] The blade-film bonding strength is a key factor determining the cutting performance of coated tools. This bonding force is closely related to the bonding interface, substrate microstructure, and coating microstructure. For the bonding interface, failure can be attributed to factors such as lattice mismatch, low surface energy, thermal expansion coefficient mismatch, and discontinuous interface morphology. These microscopic defects not only weaken the effective interatomic bonding at the blade-film interface but also hinder the nucleation and epitaxial growth of the coating, ultimately leading to interface fracture and premature peeling. For the substrate microstructure, the lack of an ideal gradient transition structure on the tool substrate surface causes abrupt changes in mechanical properties at the blade-film interface (discontinuous hardness and elastic modulus gradients), disrupting the continuity of interfacial stress transmission and easily inducing residual stress concentration, thus exacerbating interface failure. Regarding the coating microstructure, columnar grain boundaries, as weak points in the PVD coating microstructure, provide a low-resistance propagation path for crack propagation. Under cutting loads, cracks preferentially propagate along columnar grain boundaries and rapidly penetrate the coating, then extend towards the blade-film interface, ultimately inducing interfacial bonding failure.

[0004] Currently, to address the bottleneck of weak blade-film adhesion, ion etching is typically performed before PVD coating to activate the tool substrate surface and enhance interfacial chemical bonding. Building upon this, surface microtexturing, gradient / multilayer structure design, and ion nitriding / carburizing techniques have been proposed to further improve interfacial bonding performance. However, existing technologies still face certain limitations in practical applications: while microtexturing can improve adhesion through mechanical anchoring, its limited texture size (typically 0.05-1 mm) makes it difficult to achieve texture formation in critical areas such as the tool cutting edge, resulting in the unresolved blade-film adhesion problem at the cutting edge of traditional textured coated tools. Furthermore, current microtexturing processes commonly use nanosecond (Ns) or picosecond (Ps) lasers, resulting in heat-affected zones and oxide layers with depths exceeding 2-5 μm, far exceeding the removal depth of ion etching (approximately equal to...). Firstly, while gradient / multilayer coating design can alleviate interfacial mismatch by distributing stress gradients, the essence of gradient / multilayer coating toughening is to achieve toughness improvement by sacrificing the hardness of the underlying coating, making it difficult to achieve the optimal balance between high hardness and high adhesion. Secondly, although ion nitriding / carburizing can significantly improve the surface hardness and load-bearing capacity of the substrate, it is difficult to control the microstructure of the coating, and the ion implantation process is prone to inducing the precipitation of brittle new phases, increasing the risk of surface cracking and interfacial instability.

[0005] It is evident that the aforementioned existing technologies all focus on optimizing local aspects of the substrate, interface, and coating structure, resulting in a failure to effectively improve the blade-film adhesion. Summary of the Invention

[0006] The purpose of this application is to provide a coated cutting tool with a periodic surface structure and its preparation method. By constructing a periodic surface structure on the surface of the cutting tool substrate, the local surface energy state and interfacial atom adsorption behavior of the cutting tool substrate surface are controlled, so as to achieve high-density stable nucleation and ordered growth induction in the early stage of coating deposition, realize the control of interface / substrate nucleation, thereby improving the coating growth behavior, coating microstructure and interfacial bonding performance, and significantly improving the blade-film bonding strength.

[0007] To achieve the above objectives, in a first aspect, this application provides a method for preparing a coated cutting tool with a periodic surface structure, comprising: S1: Pre-treatment of the tool substrate; S2: A surface structure with a periodic undulating morphology is constructed on the surface of the tool substrate, wherein the horizontal period of the periodic undulating morphology is in the range of 50nm-10μm and the height is 50nm-10μm. S3: Perform surface activation or etching treatment on the tool substrate; S4: Deposit a functional coating on the surface of the tool substrate to obtain a coated tool with a periodic surface structure.

[0008] In a preferred embodiment of this application, the pretreatment of the tool substrate includes: The tool substrate is cleaned and dried. Alternatively, the tool substrate can be polished, cleaned, and dried.

[0009] In a preferred embodiment of this application, the surface structure of the periodic undulating morphology is a corrugated periodic structure, a lattice periodic structure, a groove periodic structure, or a micro-nano composite periodic structure formed by laser induction.

[0010] In a preferred embodiment of this application, the step of constructing a surface structure with a periodic undulating morphology on the surface of the tool substrate includes: A surface structure with periodic undulating morphology is constructed on the surface of the tool substrate by means of grinding wheel, ion beam processing, laser ablation processing or laser-induced processing.

[0011] In a preferred embodiment of this application, the grinding wheel used in the grinding method has a particle size of 0.1-0.5 μm; The ion beam processing method uses at least one of Ga+ ions and He+ ions; The laser-induced processing method employs femtosecond, picosecond, or nanosecond laser processing.

[0012] In a preferred embodiment of this application, after surface activation or etching treatment of the tool substrate, the contact angle of the surface structure with periodic undulation morphology is ≤10°, exhibiting a superhydrophilic state.

[0013] In a preferred embodiment of this application, the surface activation or etching treatment of the tool substrate includes: The tool substrate is surface activated or etched using at least one of ion etching or plasma cleaning.

[0014] In a preferred embodiment of this application, the deposition of a functional coating on the surface of the tool substrate includes: Functional coatings are deposited on the surface of tool substrates using deposition methods such as arc ion plating, magnetron sputtering, arc-magnetron composite deposition, or chemical vapor deposition.

[0015] In a preferred embodiment of this application, the functional coating is a single-layer coating, a multi-layer coating, a gradient coating, or a nanocomposite coating.

[0016] Secondly, this application provides a coated cutting tool with a periodic surface structure, which is prepared using the above-described method for preparing a coated cutting tool with a periodic surface structure.

[0017] This application discloses a coated cutting tool with a periodic surface structure and its preparation method, which, compared with the prior art, has at least the following advantages: This application takes into account the overall control of the substrate-interface-coating, and constructs a periodically undulating surface structure on the tool substrate surface. This periodically undulating surface structure has periodically distributed peaks, valleys, and / or sidewall curvature regions in space, forming a spatially non-uniformly distributed surface energy characteristic, which is used to control the interface / base nucleation behavior in the early stage of coating deposition, control the local surface energy state and interface atom adsorption behavior on the tool substrate surface, achieve high-density stable nucleation and ordered growth induction in the early stage of coating deposition, realize interface / base nucleation control, and thus improve the coating growth behavior, coating microstructure and interface bonding performance, significantly improving the tool-film bonding strength. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic flowchart of a method for preparing a coated cutting tool with a periodic surface structure according to an embodiment of this application; Figure 2 These are comparative diagrams of the coating growth structures on ordinary surfaces (a, b, c) and periodically structured surfaces (d, e, f) provided in the embodiments of this application. Figure 3 This is a comparison diagram of the coating grain boundaries of a normal surface (a) and a periodic structure surface (b) provided in the embodiments of this application; Figure 4 This is a comparison diagram of the coating adhesion between a normal surface (a) and a periodic structure surface (b) provided in the embodiments of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0025] See Figure 1 A method for preparing a coated cutting tool with a periodic surface structure according to an embodiment of this application includes the following steps: S1: Pre-treatment of the tool substrate; S2: Construct a surface structure with a periodic undulating morphology on the surface of the tool substrate; S3: Perform surface activation or etching treatment on the tool substrate; S4: Deposit a functional coating on the surface of the tool substrate to obtain a coated tool with a periodic surface structure.

[0026] In this embodiment, the tool substrate can be one of cemented carbide, cermet, high-speed steel, cubic boron nitride substrate, or ceramic tool substrate.

[0027] In this embodiment, the horizontal period of the periodic undulating surface structure is 50nm-10μm and the height is 50nm-10μm; for example, the periodic undulating surface structure can be constructed and formed at least one of the rake face, flank face, and cutting edge region of the tool. Among them, the surface structure of the periodic undulating morphology has periodically distributed peaks, valleys, and / or sidewall curvature regions in space, which in turn leads to local curvature differences. These local curvature differences can change the surface energy, adsorbed atom chemical potential, and heterogeneous nucleation barrier of the substrate surface. Furthermore, the periodic undulating surface structure forms a non-uniform distribution of surface energy in space, actively regulating the initial nucleation process of the interface and realizing the "basal surface nucleation regulation" function of the tool coating, which is not simply about increasing roughness or increasing mechanical engagement.

[0028] The specific working principle is as follows: After introducing a periodic undulating surface structure into the tool substrate, different local curvatures and different surface atomic arrangements will form in its peaks, valleys, and sidewall regions, leading to a non-uniform spatial distribution of surface energy. This non-uniform surface energy distribution will further affect the deposition, diffusion, rearrangement, nucleation, and growth state of atoms. 1) Adsorption stage: Different curvature regions have different adsorption energies for deposited atoms, making it easier for some regions to form stable adsorption sites; 2) Diffusion stage: The local surface energy gradient changes the migration path and diffusion rate of deposited atoms, causing atoms to accumulate in positions conducive to stable nucleation; 3) Rearrangement stage: The periodic structure changes the local stacking mode of the atoms at the interface, making the interface bonding state more conducive to the formation of stable crystal nuclei; 4) Nucleation stage: By lowering the nucleation barrier in some areas, the probability of crystal nucleation is increased, and the interface is transformed from low-density random nucleation to high-density controlled nucleation. 5) Growth stage: After the formation of high-density crystal nuclei, the coating undergoes stronger grain competition and orientation differentiation during growth, thereby inhibiting the continuous growth of coarse columnar crystals and promoting the formation of fine-grained layers and polycrystalline structures at the interface.

[0029] This application discloses a method for preparing a coated cutting tool with a periodic surface structure. This method achieves overall control of the substrate-interface-coating process by constructing a periodically undulating surface structure on the tool substrate surface. This periodically undulating surface structure has periodically distributed peaks, valleys, and / or sidewall curvature regions, forming a spatially non-uniformly distributed surface energy characteristic. This is used to control the interface / base nucleation behavior in the early stages of coating deposition, regulate the local surface energy state and interface atom adsorption behavior of the tool substrate surface, achieve high-density stable nucleation and ordered growth induction in the early stages of coating deposition, and realize interface / base nucleation control. This improves the coating growth behavior, coating microstructure, and interfacial bonding performance, significantly enhancing the tool-film bonding strength. For further details, please refer to... Figures 2 to 4 , Figures 2 to 4 This paper presents a comparison of coating growth microstructure, grain boundaries, and adhesion between ordinary surfaces and periodically structured surfaces. Figures 2 to 4 It can be seen that the coating growth structure, coating grain boundaries, and coating adhesion of the periodic structure surface are significantly better than those of the ordinary surface; Specifically, in terms of the bonding strength between the tool and the coating, the increased interface nucleation density, enhanced interfacial atomic bonding, and more stable local interface configuration can significantly improve the bonding strength between the tool substrate and the coating, reducing the risk of coating peeling during cutting. In terms of improving the coating microstructure, it can induce the coating to transform from traditional coarse columnar crystals to fine-grained, polycrystalline, or nanocrystalline structures, reduce through-grain boundaries, and improve the overall toughness and structural stability of the coating.

[0030] Preferably, in this embodiment, the tool substrate undergoes pretreatment, including: The tool substrate is cleaned and dried. Alternatively, the tool substrate can be polished, cleaned, and dried.

[0031] Pre-treatment of the tool substrate can help to form a surface structure with periodic undulations on the tool substrate surface, thereby improving the quality of coated tools.

[0032] Preferably, in this embodiment, the surface structure with periodic undulations is a corrugated periodic structure, a lattice periodic structure, a groove periodic structure, or a micro-nano composite periodic structure formed by laser induction.

[0033] Understandably, in other embodiments, the periodic undulating surface structure may also be other surface structures capable of forming a periodic surface energy undulation distribution on the tool substrate surface, which will not be listed here.

[0034] Optionally, a surface structure with a periodic undulating morphology is constructed on the surface of the tool substrate, including: A surface structure with periodic undulating morphology is constructed on the surface of the tool substrate by means of grinding wheel, ion beam processing, laser ablation processing or laser-induced processing.

[0035] Furthermore, the grinding wheel used in the grinding method has a particle size of 0.1-0.5μm; The ion beam processing method uses at least one of Ga+ ions and He+ ions; Laser-induced processing uses femtosecond, picosecond, or nanosecond lasers.

[0036] Specifically, when using grinding wheel to construct a surface structure with periodic undulations on the tool substrate surface, the target periodic surface structure (i.e., the expected periodic surface structure) can be obtained by using machining parameters such as rotational speed, feed rate, depth of cut, number of repetitions, grinding path and angle. When using laser-induced processing to construct a surface structure with periodic undulating morphology on the tool substrate, the desired periodic surface structure with the required period, amplitude, depth, and curvature distribution can be obtained by adjusting processing parameters such as laser energy, pulse frequency, scanning speed, polarization direction, overlap rate, number of scans, and incident angle.

[0037] Preferably, in this embodiment, the tool substrate undergoes surface activation or etching treatment, including: The tool substrate is surface activated or etched using at least one of ion etching or plasma cleaning.

[0038] After surface activation or etching of the tool substrate, the contact angle of the periodic undulating morphology surface structure is ≤10°, exhibiting a superhydrophilic state.

[0039] By performing surface activation / etching treatment on the tool substrate after the formation of a periodic surface structure, weakly bonded oxide layers, recrystallized layers, or impurities on the surface can be removed, thereby improving surface cleanliness and activity.

[0040] Preferably, in this embodiment, depositing a functional coating on the surface of the tool substrate includes: Functional coatings are deposited on the surface of tool substrates using deposition methods such as arc ion plating, magnetron sputtering, arc-magnetron composite deposition, or chemical vapor deposition.

[0041] The functional coating can be a single-layer coating, a multi-layer coating, a gradient coating, or a nanocomposite coating, preferably a nitride, boride, carbide, oxide, or other composite coating, such as HfB2, TiAlN, AlCrN, AlTiN, TiSiN, CrN, or other hard functional coatings suitable for cutting tools.

[0042] This application also provides a coated cutting tool with a periodic surface structure, which is prepared using the above-described method for preparing a coated cutting tool with a periodic surface structure.

[0043] Example 1

[0044] This embodiment provides a method for preparing a coated cutting tool with a periodic surface structure, comprising the following steps: S1, Tool substrate preparation 1) Place the tool substrate on a special cleaning rack, put it into an ultrasonic cleaner containing acetone, ultrasonic frequency 40 kHz, cleaning time 5 min, then take it out and blow it dry; 2) Then place the tool substrate into an ultrasonic cleaner containing alcohol, with an ultrasonic frequency of 40 kHz and a cleaning time of 10 min, then remove and blow dry; 3) Finally, place it in an ultrasonic cleaner containing deionized water, heat to 60°C, ultrasonic frequency 40 kHz, clean for 5 minutes, then remove and blow dry.

[0045] Among them, the machining object (tool substrate): a cemented carbide tool substrate with no coating on the surface (material is WC-Co, rake face helix angle is 45°, tool diameter is 6 mm, initial cutting edge radius is 2μm, target cutting edge radius is 4μm, and the target cutting edge shape is a circular arc cutting edge).

[0046] S2, Tool body positioning and grinding wheel selection 1) Fix the tool body onto the CNC grinding machine tool fixture; 2) Select a diamond grinding wheel with a particle size of 0.2μm, a wheel diameter of 80 mm, and a hardness suitable for cemented carbide machining.

[0047] S3, periodic surface structure obtained by grinding with a grinding wheel. 1) Control machining parameters: rotation speed 4000rpm, feed rate 80mm / min, cutting depth 0.5μm, repeat each groove 3 times, and the grinding path is arranged parallel to the center line of the cutting edge; 2) Forms a striped / grooved periodic surface structure with a horizontal period of 1 μm and a height of 0.8 μm, and the spatial surface energy is non-uniformly distributed.

[0048] S4, Surface activation treatment: ultrasonic cleaning + plasma cleaning, so that the contact angle of the periodically undulating surface structure is ≤5°, ensuring the stability of the crystal nuclei in the early stage of coating deposition.

[0049] S5, Functional coating deposition: Arc ion plating of multi-layer TiN / CrN coating, with a total coating thickness of 4μm, forming a fine-grained interface as the base layer, and high crystal density.

[0050] Example 2

[0051] This embodiment provides a method for preparing a coated cutting tool with a periodic surface structure, comprising the following steps: S1, Tool substrate cleaning: Same as S1 in Example 1, wherein the machining object (tool substrate): carbide end mill, helix angle 45°, tool diameter 6 mm, initial cutting edge radius 2 μm, target cutting edge radius 4 μm.

[0052] S2, Tool base positioning and machining path determination 1) Fix the tool body onto the femtosecond laser machine tool fixture; 2) Based on the three-dimensional model and parameters of the tool substrate, perform laser focusing to determine the machining path and incident angle; 3) The focal length error is controlled within ±0.5μm, and the incident direction is parallel to the center line of the wedge angle of the cutting edge.

[0053] S3, femtosecond laser processing of periodic surface structures 1) Adopt a semi-precision-precision composite processing strategy: Semi-finishing: power 15W, wavelength 1064nm, spot diameter 30μm, pulse width 20fs, repetition frequency 900kHz, scanning speed 1000mm / s, laser taper 10°, and the cutting edge radius is measured to 3.5μm every 5 scans; Finishing: Power 10W, pulse width 200fs, repetition frequency 1000kHz, scanning speed 500mm / s, laser taper 10°, the cutting edge radius is checked every 5 scans until it reaches 4μm; 2) The processing path is a parallel scan, forming a peak-to-valley spacing of about 0.5-5μm, forming a periodic micro-nano structure layer, and the spatial surface energy distribution is non-uniform.

[0054] S4, Surface activation: Ion etching to make the contact angle of the periodically undulating surface structure ≤10°, forming a superhydrophilic surface.

[0055] S5, Functional coating deposition: PVD (physical vapor deposition) multilayer AlTiN / CrN coating, with a total coating thickness of 5μm, refined coating grains, and high-density distribution of interface crystal nuclei.

[0056] Example 3

[0057] This embodiment provides a method for preparing a coated cutting tool with a periodic surface structure, comprising the following steps: S1, Tool substrate cleaning: Same as S1 in Example 1, wherein the machining object (tool substrate): carbide end mill, diameter 8mm, initial cutting edge radius 2μm, target cutting edge radius 4μm.

[0058] S2, Tool body positioning and grinding wheel selection 1) Fix the tool body onto the CNC grinding machine tool fixture; 2) Select a diamond grinding wheel with a particle size of 0.3μm, a wheel diameter of 100mm, and a hardness suitable for cemented carbide machining.

[0059] S3, periodic surface structure obtained by grinding with a grinding wheel. 1) Control machining parameters: rotation speed 3000rpm, feed rate 50mm / min, cutting depth 0.5μm, repeat each groove 3 times, and the grinding path is arranged parallel to the center line of the cutting edge; 2) After each scan segment is completed, measure the blade radius until the target radius of 4μm is reached; 3) Forming a striped / grooved periodic surface structure with a horizontal period of 0.5-5μm and a height of 0.1-0.5μm, so that the spatial surface energy is non-uniformly distributed.

[0060] S4, Surface activation: Ultrasonic cleaning + plasma cleaning, so that the contact angle of the periodically fluctuating surface structure is ≤10°, ensuring the stability of the crystal nuclei in the early stage of coating deposition.

[0061] S5, Functional coating deposition: Arc ion plating of multi-layer TiAlN / CrN coating, with a total coating thickness of 4μm, forming a fine-grained interface as the base layer, and high crystal density.

[0062] Example 4

[0063] Based on any of the embodiments 1 to 3 above, the difference between Embodiment 4 and any of Embodiments 1 to 3 lies in the functional coating deposition step, and post-processing is performed after the functional coating deposition is completed. Specifically, Functional coating deposition: 1) Using an arc-magnetron composite deposition method, a three-layer gradient coating is deposited: bottom layer (undercoat): HfB2, 0.5μm thick, fine-grained, with high interfacial nucleus density; middle layer: AlTiN, 2μm thick, nanocrystalline + polycrystalline mixed structure; top layer: AlCrN, 2.5μm thick, coarse columnar crystals and fine crystals combined to enhance wear resistance; 2) During each deposition process, the temperature is controlled at 200-400°C, and the vacuum degree is ≤5×10⁻⁶. -3 Pa, deposition rate 0.5-1 μm / min, to ensure uniform grain distribution.

[0064] Post-processing: Low-temperature annealing for 50 minutes, stress relief treatment, and light polishing of the cutting edge to finally obtain the coated tool.

[0065] In all the above embodiments, "large" and "small" are relative terms, "more" and "less" are relative terms, and "upper" and "lower" are relative terms. The embodiments of this application will not elaborate further on the expression of such relative terms.

[0066] It should be understood that phrases such as "in one embodiment," "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, phrases such as "in one embodiment," "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0067] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0068] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. A method for preparing a coated cutting tool with a periodic surface structure, characterized in that, include: S1: Pre-treatment of the tool substrate; S2: A surface structure with a periodic undulating morphology is constructed on the surface of the tool substrate, wherein the horizontal period of the periodic undulating morphology is in the range of 50nm-10μm and the height is 50nm-10μm. S3: Perform surface activation or etching treatment on the tool substrate; S4: Deposit a functional coating on the surface of the tool substrate to obtain a coated tool with a periodic surface structure.

2. The method for preparing a coated cutting tool with a periodic surface structure according to claim 1, characterized in that, The pretreatment of the tool substrate includes: The tool substrate is cleaned and dried. Alternatively, the tool substrate can be polished, cleaned, and dried.

3. The method for preparing a coated cutting tool with a periodic surface structure according to claim 1, characterized in that, The surface structure of the periodic undulating morphology is a wavy periodic structure, a lattice periodic structure, a groove periodic structure, or a micro-nano composite periodic structure formed by laser induction.

4. A method for preparing a coated cutting tool with a periodic surface structure according to claim 1 or 3, characterized in that, The process of constructing a surface structure with a periodic undulating morphology on the surface of the tool substrate includes: A surface structure with periodic undulating morphology is constructed on the surface of the tool substrate by means of grinding wheel, ion beam processing, laser ablation processing or laser-induced processing.

5. The method for preparing a coated cutting tool with a periodic surface structure according to claim 4, characterized in that, The grinding method described uses grinding wheels with a particle size of 0.1-0.5μm; The ion beam processing method uses at least one of Ga+ ions and He+ ions; The laser-induced processing method employs femtosecond, picosecond, or nanosecond laser processing.

6. The method for preparing a coated cutting tool with a periodic surface structure according to claim 1, characterized in that, After surface activation or etching of the tool substrate, the contact angle of the periodic undulating morphology surface structure is ≤10°, exhibiting a superhydrophilic state.

7. A method for preparing a coated cutting tool with a periodic surface structure according to claim 1 or 6, characterized in that, The surface activation or etching treatment of the tool substrate includes: The tool substrate is surface activated or etched using at least one of ion etching or plasma cleaning.

8. The method for preparing a coated cutting tool with a periodic surface structure according to claim 1, characterized in that, The deposition of a functional coating on the surface of the tool substrate includes: Functional coatings are deposited on the surface of tool substrates using deposition methods such as arc ion plating, magnetron sputtering, arc-magnetron composite deposition, or chemical vapor deposition.

9. A method for preparing a coated cutting tool with a periodic surface structure according to claim 1 or 8, characterized in that, The functional coating is a single-layer coating, a multi-layer coating, a gradient coating, or a nano-composite coating.

10. A coated cutting tool with a periodic surface structure, characterized in that, It is prepared using the method for preparing a coated cutting tool with a periodic surface structure as described in any one of claims 1-9.

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