High-speed milling cutter for processing gear teeth and preparation method and application thereof

Abstract

The application discloses a high-speed milling tooth processing roller milling cutter and a preparation method and application thereof. The high-speed milling tooth processing roller milling cutter comprises a base body and a composite coating arranged on the surface of the base body. The composite coating comprises a base layer and a functional layer arranged in the base body from inside to outside. The base layer comprises an AlTiCrN layer. The functional layer comprises alternately arranged TiBN layers and TiB2 layers. The innermost layer of the functional layer is a TiBN layer, and the outermost layer is a TiB2 layer. The roller milling cutter forms a periodic multilayer structure on the surface of the AlTiCrN layer. Under the working condition of high-speed milling tooth processing of a band saw blade, the roller milling cutter can effectively alleviate the defect of insufficient toughness of a single-component and single-structure coating, inhibit the crater wear of a rake face, and is more suitable for high-speed intermittent cutting working conditions of three different materials in milling tooth processing, reduces the frequency of roller milling cutter off-machine grinding, and realizes the synergistic improvement of milling tooth processing precision and efficiency.

Description

Technical Field

[0001] This application relates to the field of hobbing cutter technology, and in particular to a high-speed hobbing cutter for gear milling, its manufacturing method, and its application. Background Technology

[0002] Band saw blades, hailed as "the craftsman's hand," are widely used in the raw material cutting and blanking processes of manufacturing. With the continuous development of advanced cutting technologies, band saw blade sawing has shifted from extensive processing to high-speed, high-efficiency operations, placing higher demands on the precision of band saw blade tooth machining. For a long time, band saw blade tooth machining relied on low-speed milling with hobbing cutters (spindle speed of 60-80 rpm) to reduce cutting forces and ensure tooth accuracy. However, low-speed milling has inherent defects such as numerous burrs and built-up edge accumulation, severely limiting further improvements in tooth machining accuracy. With the improvement of milling equipment performance, high-speed milling (spindle speed of 90-120 rpm) has shown significant advantages in tooth machining accuracy and cost.

[0003] In the milling process of band saw blades, the hobbing cutter needs to simultaneously cut three different materials: high-speed steel (the tooth material of the band saw blade), weld seams, and spring steel (the back material of the band saw blade). Multiple cutting edges simultaneously entering and exiting the machine constitute a typical intermittent cutting condition for difficult-to-machine materials, causing the hobbing cutter to wear rapidly and requiring periodic re-sharpening. Frequent tool changes create tool joints on the band saw blade, directly affecting the machining accuracy of the teeth. Increasing the spindle speed of the hobbing cutter further accelerates its failure. Therefore, there is an urgent need to develop coated hobbing cutters suitable for high-speed milling of band saw blades to achieve a synergistic improvement in milling accuracy and efficiency. Summary of the Invention

[0004] This invention provides a hobbing cutter for high-speed gear milling, its manufacturing method, and its application, in order to solve the technical problem in the prior art where the easy wear of hobbing cutters leads to frequent tool changes during band saw blade machining, affecting the accuracy of tooth profile machining.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, the present invention provides a hobbing cutter for high-speed gear milling, comprising a substrate and a composite coating disposed on the surface of the substrate, the composite coating comprising a base layer and a functional layer disposed sequentially from the inside to the outside of the substrate, the base layer comprising an AlTiCrN layer, the functional layer comprising alternating TiBN layers and TiB2 layers; the innermost layer of the functional layer is the TiBN layer, and the outermost layer is the TiB2 layer.

[0007] Furthermore, the thickness of the AlTiCrN layer is 1.0 μm to 3.0 μm; the total thickness of the alternating TiBN and TiB2 layers is 2.0 μm to 6.0 μm.

[0008] Furthermore, the functional layer includes multiple alternating TiBN layers and TiB2 layers. In each alternating unit, the thickness of the TiBN layer is 100nm to 500nm, and the thickness of the TiB2 layer is 200nm to 1000nm.

[0009] Furthermore, the thickness ratio of the TiBN layer to the TiB2 layer is 2.5:1 to 25.

[0010] Furthermore, the atomic percentage of each element in the AlTiCrN layer is as follows: Al 20%–40%, Ti 5%–15%, Cr 5%–25%, and N 45%–55%.

[0011] Furthermore, the atomic percentage of each element in the TiBN layer is as follows: Ti is 20%–40%, B is 30%–70%, and N is 1%–30%.

[0012] Furthermore, the atomic percentage of N element in the TiBN layer decreases from the inside to the outside of the matrix.

[0013] Furthermore, the atomic percentage of each element in the TiB2 layer is as follows: Ti is 20%–50%, and B is 50%–80%.

[0014] Furthermore, the substrate includes a blade body and a cutting edge, wherein the blade body is made of powder metallurgy high-speed steel, and the cutting edge is made of powder metallurgy high-speed steel or cemented carbide.

[0015] In a second aspect, the present invention provides a method for preparing the above-mentioned high-speed gear milling hob, comprising the following steps: pre-treating the substrate, and depositing the base layer and the functional layer sequentially on the surface of the pre-treated substrate, thereby obtaining the high-speed gear milling hob.

[0016] Furthermore, the step of depositing the functional layer includes depositing a TiBN layer and a TiB2 layer sequentially as an alternating unit on the surface of the substrate, and then depositing multiple alternating units until the functional layer reaches a preset thickness.

[0017] A third aspect of the present invention provides the application of the above-described high-speed milling hob in band saw blade milling.

[0018] The hob for high-speed gear milling provided by this invention has an AlTiCrN layer on the surface of the substrate, and alternating units are deposited on the AlTiCrN layer. Each alternating unit includes a TiBN layer and a TiB2 layer, forming a periodic multi-layer structure on the surface of the AlTiCrN layer. Under the working conditions of high-speed gear milling of band saw blades, it can effectively alleviate the defects of insufficient toughness of coatings with single composition and structure, and suppress crater wear on the rake face. Thanks to its excellent film-substrate bonding strength and high-temperature mechanical properties, it is more suitable for high-speed intermittent cutting conditions of three different materials in gear milling, reducing the number of times the hob is regrinded off the machine, and achieving a synergistic improvement in the accuracy and efficiency of gear milling. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the substrate and composite coating of a hobbing cutter for high-speed gear milling in an embodiment of the present invention;

[0021] Figure 2 The cutting life diagrams are for hobbing cutters in Embodiments 1 to 4 and Comparative Examples 1 to 6 of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0026] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0027] like Figure 1 As shown, in a first aspect of this application, a hobbing cutter for high-speed gear milling is provided, including a substrate and a composite coating disposed on the surface of the substrate. The composite coating includes a base layer and a functional layer disposed sequentially from the inside to the outside of the substrate. The base layer includes an AlTiCrN layer, and the functional layer includes alternating TiBN layers and TiB2 layers. The innermost layer of the functional layer is a TiBN layer, and the outermost layer is a TiB2 layer.

[0028] In this embodiment, the substrate includes an AlTiCrN layer. AlTiCrN can be considered as AlTiN with the introduction of Cr element, or AlCrN with the introduction of Ti element. From the perspective of AlTiN, when the atomic percentage of Al / (Al+Ti) in AlTiN exceeds 67%, the coating structure changes from a face-centered cubic structure to a face-centered cubic hexagonal structure, exhibiting a significant decrease in mechanical properties. However, after the introduction of Cr element, even if the atomic percentage of Al / (Al+Ti+Cr) reaches about 70%, the face-centered cubic structure of the coating is still maintained, thus enabling the AlTiCrN layer to exhibit higher hardness and elastic modulus. At the same time, Cr element can form (Al,Cr)2O3 on the coating surface, thereby improving the coating's oxidation resistance.

[0029] From the perspective of AlCrN, although its initial oxidation temperature is as high as 1100℃~1200℃, its thermal stability is poor, and the coating wear rate is high, making it unsuitable for hard cutting. Introducing Ti into AlCrN significantly improves the mechanical properties of the coating and enables the formation of a self-lubricating layer on the coating surface during cutting operations, thereby enhancing the coating's wear resistance and friction reduction performance.

[0030] In addition, AlTiCrN exhibits excellent bonding properties with both high-speed steel and cemented carbide substrates. The hobbing cutter body is made of powder metallurgy high-speed steel, and the cutting edge is also made of powder metallurgy high-speed steel or cemented carbide. Furthermore, it possesses good chemical stability, effectively inhibiting the adhesion of the workpiece material to the tool surface. Even if the functional layer wears down, AlTiCrN can still protect the hobbing cutter used in high-speed milling. As a performance transition between the functional layer and the hobbing cutter substrate, it is suitable for high-speed milling operations involving band saw blades.

[0031] In this embodiment, the functional layer comprises alternating TiBN and TiB2 layers. Compared to the TiB2 coating, the TiBN layer introduces nitrogen (N) element, which can improve the toughness, oxidation resistance, and reduce residual stress of the functional layer. However, in actual fabrication, magnetron sputtering deposited TiB2 coatings often exhibit a columnar crystal structure and are overstoichiometric (i.e., the atomic percentage of B / Ti is greater than 2). Excessive B tends to segregate at grain boundaries. In this case, the introduction of N element easily combines with B, resulting in the precipitation of the soft BN phase, leading to a sharp decline in the mechanical properties of the TiBN layer. Generally speaking, TiBN layers with such a sharp decline in mechanical properties have poor performance in practical cutting applications. However, in the structural and compositional design of the functional layer, this application alternately deposits TiBN and TiB2 layers on the surface of the base layer until a functional layer of a predetermined thickness is formed. That is, a TiBN layer is inserted into a TiB2 layer with high melting point, high hardness, wear resistance, friction reduction, stable chemical properties, and controlled stoichiometry. This forms a stable performance transition from the hobbing cutter substrate to the base layer to the functional layer, avoiding early coating failure caused by the periodic thermal shock and mechanical impact loads caused by the hobbing cutter cutting three different materials simultaneously during high-speed gear milling. It effectively avoids the inherent defects of TiB2 layer itself, such as excessive residual stress, poor toughness, and poor bonding strength with the tool substrate. It effectively alleviates the defects of insufficient toughness of coatings with single composition and structure, and suppresses crater wear on the rake face. Thanks to the excellent film-substrate bonding strength and high-temperature mechanical properties, it is more suitable for the high-speed intermittent cutting conditions of three different materials in gear milling, reducing the number of hobbing cutter over-grinding operations and achieving a synergistic improvement in the accuracy and efficiency of gear milling.

[0032] Specifically, the thickness of the AlTiCrN layer is 1.0 μm to 3.0 μm; the total thickness of the alternating TiBN and TiB2 layers is 2.0 μm to 6.0 μm. Further, the functional layer includes multiple alternating TiBN and TiB2 layers. In each alternating unit, the thickness of the TiBN layer is 100 nm to 500 nm, and the thickness of the TiB2 layer is 200 nm to 1000 nm. The thickness ratio of the TiBN layer to the TiB2 layer is 2.5:1 to 25. The preferred thickness ratio is 1:1 to 5. The atomic percentage content of each element in the AlTiCrN layer is: Al 20% to 40%, Ti 5% to 15%, Cr 5% to 25%, and N 45% to 55%. The atomic percentage content of each element in the TiBN layer is: Ti 20% to 40%, B 30% to 70%, and N 1% to 30%. The atomic percentages of each element in the TiB2 layer are: Ti 20%–50%, B 50%–80%.

[0033] In some embodiments, the atomic percentage of nitrogen (N) in the TiBN layer decreases from the inside to the outside of the substrate. In the embodiments of this application, the TiBN layer with a gradient distribution of N atomic percentage is inserted between multiple TiB2 layers, which can further improve the toughness and oxidation resistance of the functional layer and reduce its residual stress; it also enables a more stable performance transition from the base layer to the functional layer on the hobbing cutter surface, avoiding coating failure caused by the periodic thermal shock and mechanical impact load of the hobbing cutter under high-speed milling conditions.

[0034] A second aspect of this application provides a method for preparing the above-mentioned high-speed gear milling hob, comprising the following steps: pre-treating a substrate, and depositing a base layer and a functional layer sequentially on the surface of the pre-treated substrate to obtain the high-speed gear milling hob.

[0035] In this embodiment, the hobbing cutter manufacturing method is stable and reliable, and the production cost is controllable. The hobbing cutter for high-speed gear milling prepared by this method can significantly extend the life of band saw blade milling teeth in high-speed gear milling, and can solve the problem that hobbing cutters are prone to premature failure in high-speed intermittent cutting of three different materials in band saw blade high-speed gear milling, thus achieving a synergistic improvement in milling accuracy and efficiency.

[0036] Furthermore, the deposition of the functional layer in this step involves depositing TiBN and TiB2 layers sequentially on the surface of the substrate as an alternating unit, and then depositing multiple alternating units until the functional layer reaches a preset thickness. The alternating deposition of TiBN and TiB2 layers in the functional layer allows the coating on the hobbing cutter surface to form a stable performance transition, avoiding inherent defects in the TiB2 layer itself, such as excessive residual stress, poor toughness, and poor bonding strength with the tool substrate.

[0037] A third aspect of this application provides the application of a high-speed hobbing cutter in band saw blade milling. The hobbing cutter of this application has a significantly extended service life, enabling simultaneous improvement in both milling accuracy and efficiency.

[0038] The technical solution of this application will be described in detail below with reference to specific embodiments.

[0039] Example 1

[0040] A high-speed hobbing cutter includes a substrate and a composite coating disposed on the surface of the substrate. The composite coating includes a base layer and a functional layer disposed sequentially from the inside to the outside of the substrate. The base layer includes an AlTiCrN layer with a thickness of 1.2 μm. The functional layer includes alternating TiBN and TiB2 layers, with adjacent TiBN and TiB2 layers forming one alternating unit. Each alternating unit has a thickness of 800 nm, and the thickness ratio of the TiBN layer to the TiB2 layer in the alternating unit is 1:3. There are 6 alternating units. The innermost layer of the functional layer is a TiBN layer, and the outermost layer is a TiB2 layer. The thickness of the functional layer is 4.8 μm, meaning the total coating thickness on the surface of the hobbing cutter is 6.0 μm.

[0041] The atomic percentages of each element in the AlTiCrN layer are: Al 30%, Ti 10%, Cr 10%, and N 50%. The atomic percentages of each element in the TiB2 layer are: Ti 31% and B 69%. In the alternating units, the atomic percentages of each element in different TiBN layers from the inside to the outside of the matrix are as follows: first layer: Ti 20%, B 60%, N 20%; second layer: Ti 23%, B 61%, N 16%; third layer: Ti 26%, B 62%, N 12%; fourth layer: Ti 28%, B 64%, N 8%; fifth layer: Ti 30%, B 66%, N 4%; sixth layer: Ti 32%, B 66%, N 2%.

[0042] The above-mentioned method for preparing a hobbing cutter includes the following steps:

[0043] 1. A 3 / 4TPI hobbing cutter with powder metallurgy high-speed steel as the body material and cemented carbide as the cutting edge is sandblasted to passivate the cutting edge, ultrasonically cleaned, and vacuum dried, and then clamped into a furnace. The furnace is heated and vacuumed, and the surface of the 3 / 4TPI hobbing cutter is ion etched with Ar+H2 (90% of 99.999% pure Ar gas and 10% of 99.999% pure H2) using an ion source to obtain the hobbing cutter substrate.

[0044] 2. Physical vapor deposition was performed on the hobbing cutter substrate. First, 99.999% pure N2 was introduced, and an arc ion plating was performed on the AlTiCr target. The target current was 100A, the bias voltage was an increasing gradient of -40V to -120V, the gas pressure was 4.0Pa, the substrate support rotation speed was 3.0rpm, and the common rotation speed was 1.5rpm to prepare the AlTiCrN layer.

[0045] The AlTiCr target for arc ion plating was shut down, and 99.999% pure nitrogen and 99.999% pure argon were introduced, with the total pressure stabilized at 0.6 Pa. The nitrogen to argon flow ratios for preparing the TiBN layer, from the inside to the outside of the substrate, were 1:5, 1:6, 1:7, 1:8, 1:9, and 1:10, respectively. A 99.9% pure TiB2 target was operated in High Power Pulsed Magnetron Sputtering (HiPIMS) mode. The HiPIMS power supply had a constant average power of 2.0 kW, a peak voltage of -600 V, a constant frequency of 500 Hz, and a pulse width of 60 μs. A synchronous pulse bias of -80 V and a pulse width of 200 μs were used.

[0046] After finishing the TiBN layer, the nitrogen gas was shut off, and the total gas pressure remained constant. The 99.9% pure TiB2 target was then run in HiPIMS mode. The HiPIMS power supply maintained a constant average power of 3.0 kW, a peak voltage of -600 V, a constant frequency of 500 Hz, and a pulse width of 50 μs. A synchronous pulse bias of -120 V and a pulse width of 200 μs were used.

[0047] TiBN and TiB2 layers are deposited alternately to form a periodic multilayer structure as functional layers. Adjacent TiBN and TiB2 layers constitute one alternating unit, with each alternating unit having a thickness of 800 nm and a total of 6 alternating units. The thickness ratio of the TiBN layer to the TiB2 layer in each alternating unit is 1:3, with the outermost layer being a TiB2 layer.

[0048] After the coating deposition process is completed, the machine is cooled and removed from the furnace. The hobbing cutter is then post-processed to obtain the finished coated hobbing cutter.

[0049] Example 2

[0050] This embodiment is basically the same as Embodiment 1, except that the thickness of the alternating deposition unit is 600 nm and the number of alternating deposition units is 8. The thickness ratio of the TiBN layer to the TiB2 layer in each alternating deposition unit is 2:1, and the outermost layer is TiB2.

[0051] Example 3

[0052] This embodiment is basically the same as Embodiment 1, except that the flow ratio of nitrogen to argon in the preparation of the TiBN layer is always 1:5 from the inside to the outside of the substrate.

[0053] Example 4

[0054] This embodiment is basically the same as Embodiment 1, except that the base material of the hobbing cutter is powder metallurgy high-speed steel.

[0055] Comparative Example 1

[0056] The material and specifications of the hobbing cutter substrate in this comparative example are the same as those in Example 1. An AlTiCrN single-layer coating (atomic percentage of each element: Ti 10%, Al 30%, Cr 10%, N 50%) was prepared using an arc ion plating mode, with a coating thickness of 5.8 μm.

[0057] Comparative Example 2

[0058] The material and specifications of the hobbing cutter substrate in this comparative example are the same as those in Example 1. A TiB2 single-layer coating (atomic percentage of each element: Ti 31%, B 69%) was prepared using the HiPIMS mode, with a coating thickness of 5.9 μm.

[0059] Comparative Example 3

[0060] The material and specifications of the hobbing cutter substrate in this comparative example are the same as those in Example 1. The difference from Example 1 is that there is only a TiB2 layer in the functional layer, and the coating thickness is 5.9μm.

[0061] Comparative Example 4

[0062] The hobbing cutter substrate material and specifications in this comparative example are the same as those in Example 1, but without any coating.

[0063] A comparative experiment was conducted on milling teeth using 48mm composite steel strips with the high-speed milling cutters of Examples 1 to 4 and the milling cutters of Comparative Examples 1 to 4. The milling machine used for the comparison was an FS-2500, the material being machined was 48mm 41mm composite steel strip, the cutting parameters included a spindle speed of 110 r / min, a feed rate of 35 mm / min, and cooling with a special cooling lubricant. The coating properties of Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 1. The milling tooth life of Examples 1 to 4 and Comparative Examples 1 to 4 is shown in Table 1. Figure 1 .

[0064] Description of 48-ply composite steel strip: The composite steel strip is the raw material for band saw blades, formed by laser welding high-speed steel wire and spring steel strip. Single-ply composite steel strips are available in heights of 19mm, 27mm, 34mm, 41mm, 54mm, 67mm, and 80mm. The thickness varies from 0.9mm to 1.6mm depending on the height. To improve milling efficiency and increase the rigidity of the composite steel strip, during milling, 10-48 ply composite steel strips are typically stacked together with the high-speed steel wire on top. The stacked composite steel strips are clamped in jaws, and milling is performed using a hobbing cutter to form different band saw blade tooth shapes. This is the case in the examples and comparative examples, and will not be described in detail further.

[0065] Table 1. Mechanical properties of coatings in Examples 1 to 3 and Comparative Examples 1 to 4

[0066]

[0067] As shown in Table 1, when the coating thickness on the surface of the hobbing cutter substrate is similar, the nano-indentation hardness, hardness-to-effective elastic modulus ratio, and bonding strength of Examples 1 to 4 exhibit comprehensive performance advantages compared to Comparative Examples 1 to 4. Although Comparative Examples 1 to 4 have some coatings with stronger mechanical properties, they all have obvious shortcomings. This indicates that the hobbing cutters of Examples 1 to 4 can achieve synergistic improvement in hardness, toughness, and bonding strength. Figure 1 It can also be seen that, with a wear of 0.24mm on the back face as the standard for exiting the machine, Examples 1 to 4 show better milling tooth life in the high-speed milling of band saw blades.

[0068] This application describes a periodic multilayer functional layer consisting of an AlTiCrN base layer, alternately deposited TiBN and TiB2 layers, and a multilayered structure. The percentage of nitrogen atoms in the TiBN layer decreases from the inside out of the substrate. This coated hob, combining a periodic multilayered structure with a compositional gradient, effectively mitigates the shortcomings of single-component and structural coatings in high-speed band saw milling operations, suppressing crater wear on the rake face. Benefiting from excellent film-substrate bonding strength and high-temperature mechanical properties, it is more suitable for high-speed intermittent cutting of three different materials in gear milling, reducing the number of hob regrinding operations and achieving a synergistic improvement in milling accuracy and efficiency.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hobbing cutter for high-speed gear milling, characterized in that: The invention includes a substrate and a composite coating disposed on the surface of the substrate. The composite coating includes a base layer and a functional layer disposed sequentially from the inside to the outside of the substrate. The base layer includes an AlTiCrN layer, and the functional layer includes alternating TiBN layers and TiB2 layers. The innermost layer of the functional layer is the TiBN layer, and the outermost layer is the TiB2 layer. The atomic percentage of each element in the TiBN layer is as follows: Ti is 20%–40%, B is 30%–70%, and N is 1%–30%; the atomic percentage of N in the TiBN layer decreases from the inside to the outside of the matrix.

2. The hobbing cutter for high-speed gear milling according to claim 1, characterized in that, The thickness of the AlTiCrN layer is 1.0 μm to 3.0 μm; the total thickness of the alternating TiBN and TiB2 layers is 2.0 μm to 6.0 μm.

3. The hobbing cutter for high-speed gear milling according to claim 2, characterized in that, The functional layer includes multiple alternating TiBN layers and TiB2 layers. In each alternating unit, the thickness of the TiBN layer is 100nm to 500nm, and the thickness of the TiB2 layer is 200nm to 1000nm.

4. The hobbing cutter for high-speed gear milling according to claim 3, characterized in that, The thickness ratio of the TiBN layer to the TiB2 layer is 2.5:1 to 25.

5. The high-speed gear hobbing cutter according to any one of claims 1 to 4, characterized in that, The atomic percentage of each element in the AlTiCrN layer is as follows: Al 20%–40%, Ti 5%–15%, Cr 5%–25%, and N 45%–55%.

6. The high-speed gear hobbing cutter according to any one of claims 1 to 4, characterized in that, The atomic percentage of each element in the TiB2 layer is as follows: Ti is 20%–50%, and B is 50%–80%.

7. The high-speed gear hobbing cutter according to any one of claims 1 to 4, characterized in that, The substrate includes a blade body and a cutting edge. The blade body is made of powder metallurgy high-speed steel, and the cutting edge is made of powder metallurgy high-speed steel or cemented carbide.

8. The method for preparing a high-speed hobbing cutter for gear milling according to any one of claims 1 to 7, characterized in that, Includes the following steps: The substrate is pretreated, and the base layer and the functional layer are deposited sequentially on the surface of the pretreated substrate to obtain the hobbing cutter for high-speed gear milling.

9. The method for preparing a high-speed gear hobbing cutter according to claim 8, characterized in that, The step of depositing the functional layer includes depositing a TiBN layer and a TiB2 layer sequentially as an alternating unit on the surface of the substrate, and then depositing multiple alternating units until the functional layer reaches a preset thickness.

10. The application of the high-speed hobbing cutter for gear milling according to any one of claims 1 to 7 in the gear milling of band saw blades.

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