Method of manufacturing a tool and tool

Abstract

The application provides a cutter manufacturing method and a cutter. The manufacturing method comprises the following steps: providing a cutter body with a receiving groove in the thickness direction of the side wall; forming a multilayer structure in the receiving groove; and beveling to form a cutting edge of the cutter by the multilayer structure and the cutter body. According to the cutter manufacturing method provided by the application, the multilayer structure is formed in the receiving groove of the cutter body, and the beveling process is combined, so that the cutting edge of the cutter is formed by the multilayer structure and the cutter body. Thus, the cutter cutting edge with suitable impact toughness and interlayer bonding strength can be manufactured, the cutting edge is prevented from being broken or rolled, and the long-lasting sharpness of the cutter can be ensured.

Description

Technical Field

[0001] This application relates to the technical field of kitchen knives, and in particular to a method for manufacturing a knife and the knife itself. Background Technology

[0002] Users have a strong demand for the long-lasting sharpness of knives, and developers have made various improvements to address this need.

[0003] Some existing technologies disclose the use of a particle-accumulated structure formed by electrical discharge machining as the cutting edge of a cutting tool. While this type of cutting edge possesses a certain initial sharpness, the limited area where the particle-accumulated structure forms makes it easily worn away during subsequent sharpening, resulting in poor long-term sharpness. Other existing technologies disclose the direct fusion of a high-hardness material into the cutting edge area of ​​the tool sheet to form the cutting edge. However, this type of cutting edge is extremely prone to chipping and delamination during use, thus affecting the tool's long-term sharpness.

[0004] Clearly, the cutting edge formed by existing technologies, including the two different methods mentioned above, cannot yet effectively solve the problem of maintaining the sharpness of the cutting tool. Summary of the Invention

[0005] The purpose of this application is to provide a method for manufacturing a cutting tool and a cutting tool in order to solve the problem of poor durability and sharpness in existing tools.

[0006] According to a first aspect of this application, this application provides a method for manufacturing a cutting tool, wherein the method includes providing a cutting tool body with receiving grooves on the sidewalls in the thickness direction; forming a multi-layer structure in the receiving grooves; and sharpening the cutting edge so that the multi-layer structure and the cutting tool body together form the cutting edge of the cutting tool.

[0007] According to the tool manufacturing method provided in the embodiments of this application, by forming a multi-layer structure in the receiving groove of the tool body and combining it with the oblique grinding sharpening process, the cutting edge of the tool is formed together with the multi-layer structure and the tool body. The multi-layer structure has low internal stress and suitable impact toughness, which can reduce the risk of tool chipping. Furthermore, under extreme working conditions, even if one layer of the multi-layer structure cracks, the other layers can prevent further cracking, thus reducing the possibility of successive cracking. Therefore, it is possible to manufacture a tool cutting edge with suitable impact resistance and interlayer bonding strength, avoiding chipping and ensuring the long-term sharpness of the tool.

[0008] In some embodiments, the multilayer structure is a multilayer scaly structure. Compared to a multilayer structure of the same volume stacked in a consistent direction using individual lamellae, the multilayer scaly structure has more levels and more directional layers. Therefore, the multilayer scaly structure can better disperse impact loads and avoid local stress concentration. Together with the tool body, it forms the cutting edge of the tool with significant impact toughness, further improving the tool's sustained sharpness. In addition, the scaly structure of the cutting edge can form a micro-serrated structure at the cutting edge during sharpening through the individual scales and the gaps between the scales, thereby enabling the tool to exhibit better cutting performance.

[0009] In some embodiments, the step of forming a multilayer flake structure includes: forming droplets spaced by a rigid material to form a multilayer flake structure in the receiving groove.

[0010] In these embodiments, droplets are formed by spacing them with hard material to control the previous droplet in an adjacent droplet to spread out and remain in a semi-solid state to overlap with the next droplet, thereby constructing a multi-layered scaly structure to improve the long-lasting sharpness of the cutting tool.

[0011] As some specific embodiments, the steps of forming a multi-layered flake structure include: moving a hard material along the length of the tool to form a flake sublayer by overlapping adjacent molten droplet-structured flake monomers; forming multiple flake sublayers along the width of the tool and connecting adjacent flake sublayers to form a flake-like layer; and sequentially stacking multiple flake-like layers in the thickness direction of the tool body to form the multi-layered flake structure, which has a stacked structure in at least three directions, thereby providing better impact resistance. As some specific embodiments, the steps of forming a multi-layered flake structure include: moving a hard material along the length of the tool to form a flake-like layer by overlapping adjacent molten droplet-structured flake monomers; and sequentially stacking multiple flake-like layers in the thickness direction of the tool body to form the multi-layered flake structure, which has a stacked structure in at least two directions, thereby providing the impact resistance required for sustained sharpness improvement in composite tools.

[0012] In these embodiments, droplets are formed from hard materials. Under the influence of gravity, these droplets spread and flatten, and external temperatures cause them to solidify into a semi-solid state, thus creating scale-like rudiments (soft materials with a basic scale-like structure, partially solidified but still retaining some plasticity). These scale-like rudiments possess a certain degree of morphological stability, unaffected by subsequent droplets, and facilitate metallurgical bonding with the scale-like rudiments formed by subsequent droplets, thereby further enhancing the overall strength of the scale-like structure. Furthermore, the overlapping structure between adjacent scale units absorbs and disperses the impact energy generated during cutting, reducing tool damage and breakage due to impact and improving the tool's impact resistance.

[0013] In some embodiments, adjacent scale-like layers in the thickness direction are stacked in an aligned manner or in a staggered manner; and / or, multiple adjacent scale sub-layers in the width direction are stacked in an aligned manner or in a staggered manner. Both multi-layer scale-like structures stacked with an aligned mechanism and multi-layer scale-like structures stacked with a staggered manner have significant impact resistance and interlayer bonding strength, which can improve the long-lasting sharpness of the cutting tool.

[0014] In some embodiments, the rigid material is in the form of a strip, which is welded into molten droplets. The welding power is 2kW-20kW. The outer radius of the strip-shaped rigid material is 0.3mm-1.5mm, and the inner radius is no greater than 0.5mm, so as to control the surface area of ​​the individual flakes to 10mm². 2 -100mm 2 Furthermore, the thickness of the individual scales ranges from 100μm to 500μm.

[0015] In these embodiments, by controlling the welding power and the size of the hard material, the size of the formed droplets can be controlled appropriately, thereby enabling the manufacture of individual scales that meet the requirements for the long-term sharpness of the cutting tool, thus laying the groundwork for constructing a suitable scale-like structure.

[0016] In some embodiments, by controlling the movement speed of the hard material along the length direction of the tool to 0.1 cm / s-1 cm / s, the overlapping area of ​​adjacent scale units in the length direction is 10%-80% of the area of ​​a single scale unit. This results in the cutting edge of the tool having a layered gradient in the length direction. Thus, the multi-layered scale structure has suitable impact resistance and bonding strength, which can suppress brittle fracture of the cutting edge, avoid chipping or rolling, and further improve the tool's long-lasting sharpness.

[0017] In some embodiments, the step of forming a multilayer flake structure includes: spraying a flake-shaped hard material such that the surface of the flake-shaped hard material is slightly melted while the interior is not melted, thereby forming a multilayer flake structure in a receiving groove by sequentially stacking flake monomers of the flake-shaped hard material.

[0018] In these embodiments, by using a hard material with its own scaly structure to only slightly melt the surface during the spraying process, a cladding layer with a multi-layered scaly structure is formed by stacking the hard material with its own scaly structure. This simplifies the formation of the cladding layer with a multi-layered scaly structure and reduces manufacturing costs.

[0019] In some embodiments, the spraying distance is 5cm-30cm, the gas pressure is 0.1bar-0.5bar, and the main surface area of ​​the flake-like material is 10mm². 2 -100mm 2 The thickness is 100μm-500μm, thereby enabling control over the surface area of ​​the flake monomer to be 10mm. 2 -100mm 2 And the thickness is 100μm-500μm.

[0020] In these embodiments, by controlling the welding power and the size of the hard material, it is possible to control the scaly hard material to melt only on the surface and not inside, thereby using the scaly material’s own structure to manufacture scaly monomers of the desired size, which can lay the groundwork for constructing a suitable scaly structure.

[0021] In some embodiments, the hardness difference between the scale-like structures arranged sequentially in the thickness direction and the tool body is 50HV-200HV. In this way, a suitable hardness gradient can be constructed in the thickness direction of the cutting edge of the tool to ensure the impact toughness of the cutting edge in the thickness direction.

[0022] In some embodiments, the hard material includes at least one selected from titanium, titanium alloys, martensitic stainless steel, molybdenum series alloys, tool steel alloys, nickel-based alloys, and cobalt-based alloys; and / or, the material forming the tool body includes at least one selected from carbon steel, 3Cr13 stainless steel, 4Cr13 stainless steel, 5Cr15MoV stainless steel, 7Cr13MoV stainless steel, 8Cr13MoV stainless steel, and 9Cr18MoV stainless steel. Thus, a cutting edge of a tool that possesses excellent properties in multiple aspects, including impact toughness, corrosion resistance, and food contact safety, can be obtained.

[0023] In some embodiments, the hard material is a composite wire in which sheet-like ceramic material is dispersed within a metal wire. Under the influence of a heat source, the metal material at the tip of this composite wire can completely melt into molten metal, causing the sheet-like ceramic material to drip down with it. Since the temperature provided by the heat source has not yet reached its melting point, this portion of ceramic material does not melt but remains dispersed in the molten metal. Therefore, when forming a flake-like structure using this composite wire, the metal wire acts as a binder, forming molten metal to fully wet the surface of the tool body. The sheet-like ceramic material in the composite wire is flattened by buoyancy and gravity in the molten metal, promoting the lateral spread of the molten metal. This results in a more uniform, multi-layered flake-like structure, reducing stress on the tool structure and increasing overall strength, thereby further enhancing the tool's sustained sharpness. Furthermore, the flake-shaped ceramic material can be buoyed in the molten metal and become flush with the surface of the tool body, thereby further forming layers within the individual flakes of the flake structure, increasing the number of layers in the flake structure of this application and improving the strength of the tool. In addition, the flake-shaped ceramic material can form a metallurgical bond with the tool body through the molten metal, thereby improving the tool's long-lasting sharpness from the perspective of bonding strength.

[0024] In some embodiments, the centerline in the thickness direction of the cutting tool is S2, the bottom of the groove accommodating the groove coincides with S2, or the inclination angle relative to S2 is no greater than 10°, and the multi-layer structure is arranged sequentially along the groove bottom to the groove opening. In this way, the multi-layer scale-like structure can have a large filling amount in the thickness direction of the cutting tool, thereby improving the long-lasting sharpness of the cutting tool.

[0025] In a preferred embodiment, the multi-layer structure of the cutting edge and the tool body are arranged symmetrically with respect to the centerline of the tool's thickness direction at an S2 angle. This ensures that the cutting edge retains both the multi-layer structure and the tool body even after repeated sharpening, thereby further enhancing the tool's long-lasting sharpness.

[0026] In some embodiments, the inner wall of the receiving groove is a continuous concave arc surface or a surface with abrupt angles, both of which can meet the requirements for laying multilayer structures. In a preferred embodiment, the inner wall of the receiving groove is a continuous concave arc surface. The inner wall of the receiving groove with a continuous concave arc surface does not have abrupt angles. Therefore, when forming a multilayer flake structure, it can provide better adhesion conditions for the molten droplets than an inner wall with abrupt angles. It can guide the molten droplets to smoothly transition along the continuous concave arc surface, thereby ensuring the continuity of the flake-like monomers and the bonding of each region inside the multilayer flake structure.

[0027] In some embodiments, the multi-layer structure extends from the cutting edge along the width direction to a region corresponding to a width of 0.1mm-10mm from the cutting edge. This ensures that the tool retains a usable multi-layered scale-like structure even after continuous sharpening, thereby improving the tool's long-lasting sharpness.

[0028] According to a second aspect of this application, a cutting tool is provided, wherein the cutting tool is manufactured by the cutting tool manufacturing method described above. Attached Figure Description

[0029] The above and other aspects, features, and other advantages of this application will become clearer and more readily understood from the following detailed description of exemplary embodiments in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the front view structure of the tool body according to an embodiment of the present invention; Figure 2 This is a rear view structural schematic diagram of the tool body according to an embodiment of the present invention; Figure 3 This is an enlarged structural schematic diagram of the cross-section of the tool body in the thickness direction according to an embodiment of the present invention; Figure 4 This is a front view schematic diagram of a tool body with a receiving groove according to an embodiment of the present invention; Figure 5 This is a rear view structural schematic diagram of a tool body having a receiving groove according to an embodiment of the present invention; Figure 6 This is an enlarged structural schematic diagram of a cross-section in the thickness direction of a tool body having a receiving groove according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a tool body filled with a multi-layered scale-like structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the front view structure of the cutting tool according to the first embodiment of the present invention; Figure 9 This is a rear view structural schematic diagram of the cutting tool according to the first embodiment of the present invention; Figure 10 This is an enlarged structural schematic diagram of a cross-section in the thickness direction of a cutting tool according to a first embodiment of the present invention; Figure 11 This is a front view schematic diagram of the cutting tool according to the second embodiment of the present invention; Figure 12 This is an enlarged structural schematic diagram of a cross-section in the thickness direction of a cutting tool according to a second embodiment of the present invention; Figure 13 This is an enlarged structural schematic diagram of a cross-section in the thickness direction of a cutting tool according to a third embodiment of the present invention; Figure 14 This is a physical drawing of a cutting tool according to an embodiment of the present invention; Figure 15 This is a scanning electron microscope image of the cutting edge of a cutting tool according to another embodiment of the present invention.

[0030] Tag name 10. Tool body; 20. Receiving groove; 11. First surface; 12. Second surface; 13. First body area; 14. Second body area; 30. Tool; 32. Multi-layered scale-like structure; 321. Scale-like layer; 3211. Scale unit; 31. Cutting edge; 40. Handle connector. Detailed Implementation

[0031] The following will combine Figures 1 to 15 This application describes a method for manufacturing a cutting tool and the cutting tool itself, as provided in the embodiments of this application. It should be noted that the use of directional terms such as "upper," "lower," "left," and "right" in this application is based on the orientation of the cutting tool in its normal operating state, and is intended to clearly describe the cutting tool according to this application. It should not be construed as limiting the scope of protection of this application.

[0032] According to a first aspect of this application, a method for manufacturing a cutting tool is provided, wherein the method for manufacturing a cutting tool includes the following steps.

[0033] Step S101: Provide a tool body with receiving grooves on the sidewalls in the thickness direction.

[0034] Step S102: A multi-layer structure is formed in the receiving groove.

[0035] Step S103, sharpening, so that the cutting edge of the tool is formed by the multi-layer structure and the tool body together and serves as the cutting edge of the tool. In other words, the cutting edge is constructed by the multi-layer structure and the portion of the tool body opposite to the receiving groove and serves as the cutting edge of the tool.

[0036] According to the tool manufacturing method provided in the embodiments of this application, by forming a multi-layer structure in the receiving groove of the tool body and combining it with a sharpening process (e.g., oblique grinding), the cutting edge of the tool is formed together with the multi-layer structure and the tool body. The internal stress of the multi-layer structure is small, which can reduce the risk of chipping. Furthermore, under extreme working conditions, even if one layer of the multi-layer structure cracks, the other layers can prevent further cracking, thereby reducing the possibility of successive cracking. Therefore, it is possible to manufacture a tool cutting edge with suitable impact resistance and interlayer bonding strength, avoiding chipping or rolling, and thus ensuring the long-term sharpness of the tool.

[0037] In knife manufacturing, the selection of material hardness is often a challenging issue. Firstly, while choosing a high-hardness material effectively inhibits edge curling, it simultaneously induces embrittlement, increasing the risk of chipping. Conversely, choosing a low-hardness material, while improving toughness and preventing chipping, weakens the knife's resistance to plastic deformation, making it more prone to edge curling. Therefore, overcoming the trade-off between hardness and toughness has become a key bottleneck in knife manufacturing.

[0038] The inventors discovered that the critical hardness value for edge rolling and chipping is 600 HV. Knives made of materials with a hardness not exceeding 600 HV are prone to edge rolling but will not chip. Knives made of materials with a hardness exceeding 600 HV will not have edge rolling but will be prone to chipping. Based on this, by using materials with higher hardness and modifying the knife structure, knives can be manufactured that are neither prone to chipping nor rolling, thus overcoming the trade-off between hardness and toughness and ensuring the long-lasting sharpness of the knife.

[0039] In this embodiment, the tool body provides support for the multi-layer structure, allowing it to withstand external forces together with the multi-layer structure and preventing interlayer detachment. When the hardness of the tool body is greater than 600 HV, it is at or above the critical hardness value where it is prone to chipping but not chipping. In this case, the hardness of the multi-layer structure can be set to be equal to or slightly greater than that of the tool body. This utilizes the appropriate impact toughness and interlayer bonding strength of the multi-layer structure to compensate for the increased brittleness of the tool due to high hardness, thus reducing the possibility of chipping due to high hardness and improving the tool's long-term sharpness. When the hardness of the tool body is between 400 HV and 600 HV, it is within the range where it is prone to chipping but not chipping. In this case, the hardness of at least a portion of the multi-layer structure can be greater than the hardness of the tool body and greater than or equal to 600 HV. Thus, at least some areas of the multi-layer structure can ensure that the cutting edge obtained by combining the multi-layer structure and the tool body has improved overall hardness, preventing the tool from chipping. Furthermore, at least some areas of the multi-layer structure are part of the multi-layer structure, and therefore also have a layered structure. The layered structure has suitable impact toughness and interlayer bonding strength. Through the synergistic effect of the layered structure and the high hardness of some areas, the possibility of chipping due to the high hardness of the multi-layer structure can be reduced. In this way, the tool can be made that is not easy to chip or chip, breaking the inverse relationship between hardness and toughness, thereby ensuring the long-lasting sharpness of the tool.

[0040] In this application, the sharpening process can be a bevel grinding process, or it can be achieved by other methods, such as flat grinding.

[0041] In this application, a double-sided sharpening operation is performed after filling the multi-layer structure. Specifically, after filling the multi-layer structure, a double-sided bevel grinding process is used to form the final cutting edge of the tool. On the one hand, this ensures the thickness and flatness of the substrate (the part of the tool body opposite the receiving groove) used to fill the multi-layer structure, allowing the multi-layer structure to bond tightly with the tool body and enhancing the overall structural stability of the tool. On the other hand, the angle of the two bevels can be controlled through the sharpening process, allowing the final cutting edge of the tool to develop in a direction that is symmetrically or nearly symmetrically distributed between the multi-layer structure and the tool body, thereby obtaining a cutting edge of a multi-layer structure tool with a larger filling volume.

[0042] In this embodiment, the multilayer structure can be a structure of multiple layers stacked on top of each other. The multilayer structure can disperse impact loads and avoid local stress concentration. Together with the tool body, it forms the cutting edge of the tool. It can be understood that a portion of the thickness direction of the cutting edge is a multilayer structure, and another portion is the tool body. The cutting edge formed by this composite structure has suitable impact toughness and can maintain its sharpness for a long time.

[0043] Figure 15 This is a scanning electron microscope (SEM) image of the cutting edge of a cutting tool according to an embodiment of the present invention. See also... Figure 15 As can be seen, the cutting edge of the knife has a multi-layered structure.

[0044] In a preferred embodiment, the multilayer structure is a multilayered scaly structure. Compared to a multilayer structure where layers of equal volume are stacked in a consistent direction, the multilayered scaly structure has more levels and more directional layers, which can better disperse impact loads and avoid local stress concentration. Together with the tool body, it forms the cutting edge of the tool, which has significant impact toughness and can further improve the tool's sustained sharpness. In addition, the scaly structure of the cutting edge can form a micro-serration structure at the cutting edge during sharpening through the individual scales and the gaps between the scales, thereby enabling the tool to exhibit better cutting performance.

[0045] Figure 14 This is a physical drawing of a cutting tool according to an embodiment of the present invention, showing a partial view of the tool before sharpening, specifically a view of the cutting edge. See also... Figure 14 As can be seen, the cutting edge has a multi-layered scale-like structure.

[0046] In this application, impact toughness refers to the ratio of the energy absorbed before fracture to the original cross-sectional area of ​​the specimen under impact load, expressed in joules per square centimeter (J / cm²). 2 () or feet-pounds (ft-lb). Here, the impact toughness has a non-linear relationship with the tool hardness.

[0047] The manufacturing method of the cutting tool provided in the embodiments of this application will be described in detail below.

[0048] Provide tool body In this application, the tool body 10 is generally formed as a cuboid. Figures 1 to 3 The diagram illustrates the general structure of the tool body 10, which has a uniform thickness in all regions along the thickness direction and two opposing surfaces in that direction. However, this application is not limited to this. For example, according to the tool body of this application, the two surfaces in the thickness direction may also be slightly inclined surfaces, thus the tool body may also be generally formed into an inverted conical structure.

[0049] According to this application, the shape of the knife body 10 can be specifically set according to the type of knife it forms. In an exemplary embodiment, the knife is a kitchen knife, and the knife body 10 has a knife prototype formed from a substrate through blanking. Exemplarily, the knife body 10 is generally formed into an inverted conical structure or a cuboid structure.

[0050] According to this application, the substrate (material) forming the initial blank can be stainless steel or carbon steel with a carbon weight percentage of 0.6%-1.4% and a hardness of 400HV-1000HV. Specifically, the stainless steel can be at least one martensitic stainless steel material selected from 3Cr13, 4Cr13, 5Cr15MoV, 6Cr13MoV, 7Cr17MoV, and 102Cr17MoV. The carbon steel can be high-carbon steel or low-carbon steel. The tool body formed from these materials has a certain degree of hardness and toughness, and can serve as a base material to further improve the impact resistance and toughness of the tool. Together with the multi-layer structure, it constitutes the cutting edge of the tool, thereby making the tool persistently sharp and resistant to chipping during daily use.

[0051] Forming a receiving groove According to this application, the length direction of the tool body corresponds to the length direction of the formed tool, the width direction of the tool body corresponds to the width direction of the formed tool (corresponding to the height direction of the tool in use), and the thickness direction of the tool body corresponds to the thickness direction of the formed tool.

[0052] In this application, a receiving groove is formed on the sidewall of the tool body in the thickness direction (the corresponding area where the cutting edge of the tool will be formed), thereby obtaining a tool body with a receiving groove on the sidewall in the thickness direction. When manufacturing the receiving groove, a groove can be cut in the sidewall of the tool body in the thickness direction along a certain direction. For example, it can start from the sidewall in the width direction of the tool body and extend in the width direction to form a receiving groove with a large area.

[0053] As an example, the width of the receiving groove is 3%-10% of the width of the tool body. Here, the width of the receiving groove is the extension length of the receiving groove in the width direction of the tool body. In this way, the relatively long extension length in the width direction of the tool body can be fully utilized, thereby ensuring that the subsequent filling of the scaly structure has a sufficient amount. In addition, the larger width of the receiving groove can form a larger groove bottom area, which can increase the bonding area between the multi-layer scaly structure and the tool body, thereby improving the bonding force between the two and effectively preventing the multi-layer scaly structure from delaminating during use.

[0054] As an example, the depth of the receiving groove is 40%-60% of the thickness of the tool body. Here, the depth of the receiving groove is the length of its extension in the thickness direction of the tool body. In this way, by cooperating with subsequent beveling, the final tool retains more multi-layered scaly structures in the thickness direction. These multi-layered scaly structures in the thickness direction suppress brittle fracture at the cutting edge, improving the tool's sustained sharpness. For example, the tool retains reliable sustained sharpness even after subsequent continuous sharpening.

[0055] In this application, a receiving groove is provided on the sidewall of the tool body in the thickness direction. When the tool body has a cuboid structure, the receiving groove can also be formed into a regular structure, such as a rectangle, triangle, or ellipse. In an exemplary embodiment, the receiving groove of the tool body is formed as a rectangular groove. As an example, the width of the receiving groove is 3mm-15mm, the depth is 40%-60% of the thickness of the tool body, the length is at least equal to 1 / 3 of the length of the tool body, and it corresponds at least to the cutting edge area of ​​the formed tool. It is understood that in some embodiments, the tool body contains multiple layers of scale-like structures throughout its length direction; in this case, the length of the receiving groove is equal to the length of the tool body. In other embodiments, the tool body partially contains multiple layers of scale-like structures along its length direction, the length of which is equal to 1 / 3-2 / 3 of the length of the tool body, and it corresponds at least to the cutting edge area of ​​the formed tool.

[0056] According to this application, a receiving groove is formed on the surface of the tool body in the thickness direction. For example... Figures 1 to 6 As shown, the surface of the tool body 10 in the thickness direction includes a first surface 11 and a second surface 12. The tool body 10 also includes a handle connector 40 disposed on the side wall in the length direction of the tool. In this case, the first surface 11 is located on the right side of the handle connector 40, and the second surface 12 is located on the left side of the handle connector 40. A receiving groove is formed on the first surface 11 or the second surface 12.

[0057] In this application, the tool body 10 is a plate-like structure of uniform thickness, which can be 2.0mm-3mm thick. For example... Figures 1 to 6 As shown, the tool body 10 has a cuboid structure, and the centerline of the tool body 10 in the thickness direction is S1. Here, the centerline in the thickness direction is a virtual straight line that divides the tool body 10 into two equal halves along the thickness direction. The bottom wall of the receiving groove 20 coincides with S1, or is parallel to S1 and has a distance of no more than 0.5 mm from S1, or is slightly inclined relative to S1 (for example, the inclination angle is no more than 10°).

[0058] In this application, the receiving groove has a large coverage area (approximately 1 mm or more) in the thickness direction. Thus, when the receiving groove is completely filled with a multi-layered scaly structure, the beveled edge ensures that the final manufactured tool has a high content and multiple layers of multi-layered scaly structure on its cutting edge. This helps to suppress brittle fracture at the cutting edge and improves the tool's sustained sharpness. Especially when the multi-layered scaly structure has different hardness in the thickness direction, a hardness gradient can be formed in the thickness direction of the cutting edge, further suppressing brittle fracture and reducing stress, thereby significantly improving the tool's sustained sharpness.

[0059] In some embodiments, the method of manufacturing the cutting tool further includes a step of roughening the receiving groove (sandblasting, wire drawing) to improve the surface roughness of the inner wall (bottom wall and side wall) of the receiving groove, laying the foundation for subsequent cladding, spraying or welding to form a multi-layered scaly structure.

[0060] Filled with scaly structures According to this application, a multi-layered structure is formed / filled in the receiving groove. Thus, through subsequent double-edging, the cutting edge formed by the multi-layered structure and a portion of the tool body serves as the cutting edge of the tool. Here, the cutting edge can also be referred to as the cutting tip or the cutting edge of the tool. Such a cutting edge possesses suitable impact resistance and bonding strength, making it less prone to chipping or rolling, thereby ensuring the tool's long-lasting sharpness.

[0061] In some embodiments, the multilayer structure has a hardness gradient, meaning that the hardness along the thickness direction of the multilayer structure exhibits a gradient transition or alternating distribution. This hardness distribution design allows the multilayer structure to withstand different loads at different locations, thereby more effectively dispersing impact forces, avoiding local stress concentration, and improving the overall performance of the structure. In a preferred embodiment, the hardness of the multilayer structure exhibits an alternating distribution along the thickness direction, which can better suppress brittle fracture of the tool. For example, in the multilayer structure, the odd-numbered layers from the outside to the inside in the thickness direction are high-hardness material layers (layers 1, 3, 5, 7, 9). Even-numbered layers (2nd, 4th, 6th, 8th) The first layer has relatively low hardness, and in the event of brittle fracture, only the first layer will fracture. The second layer, due to its higher toughness, will inhibit the fracture from propagating further inward, thus suppressing brittle fracture at the cutting edge. Specifically, this method forms a multi-layered, scaly structure with either soft-hard-soft or hard-soft-hard material layers. When the hard material layer undergoes plastic deformation, it acts on the soft material layer. The soft material layer cannot stop the deformation, so the hard material layer will deform to some extent, releasing the stress in the hard material layer. Furthermore, when the hard material layer fractures, the soft material layer acts as a "barrier" to prevent further fracture, thus avoiding multi-layer structure failure. In addition, the multi-layer structure can undergo interlaminar sliding, absorbing energy and reducing chipping. Furthermore, it should be noted that in the case of a multi-layered, scaly structure, even if there is no hardness gradient, the stress between adjacent layers will interact and partially cancel each other out because the orientation of the individual lamellae in each layer is not completely consistent.

[0062] In this application, the aforementioned hardness gradient can be achieved by adjusting the material composition and heat treatment process of each layer in the multilayer structure. For example, to adjust the material composition of each layer in the multilayer structure, different composite wires can be used in adjacent layers to construct a hardness gradient with alternating hardness distributions. As another example, regarding the heat treatment process, after forming the multilayer scaly structure, the surface layer can be subjected to high-frequency quenching (to increase surface hardness) to form a hardness gradient of "soft core - hard surface".

[0063] In other embodiments, the multilayer structure can also have uniform hardness, meaning that the hardness of each part remains essentially the same throughout the entire multilayer structure. A multilayer structure with uniform hardness offers better process control during manufacturing, ensuring consistent performance across all parts. When it forms the cutting edge with the tool body, it helps maintain a relatively uniform stress state on the cutting edge during use, thereby guaranteeing the tool's cutting performance.

[0064] The following will describe in detail an embodiment of the multilayer structure according to this application, which is specifically a multilayer scale-like structure.

[0065] According to this application, the multilayer flake-like structure has a composite structure formed by aligning or staggering adjacent flake-like layers. Here, the flake-like layers can be stacked as thin sheet-like units in the thickness direction of the tool, and multiple adjacent flake-like layers in the thickness direction can have substantially similar structures. For example, the flake-like layer can be formed by aligning or staggering multiple individual flakes in the length direction of the tool. Alternatively, it can be formed by aligning or staggering multiple individual flakes sequentially in the length and width directions of the tool.

[0066] like Figure 8 As shown, the multi-layered scale-like structure 32 is composed of multiple overlapping scale units 3211, exhibiting a complex three-dimensional structure formed by the stacking or arrangement of multiple scale units 3211. Compared with multi-layered structures, this scale-like multi-layered structure possesses significantly greater impact toughness, interlayer bonding strength, and multi-layered morphology.

[0067] Reference Figures 8 to 10 The multi-layered scale structure 32 includes multiple scale-like layers 321 stacked along the thickness direction, wherein each scale-like layer 321 includes multiple scale sub-layers arranged along the width direction of the tool, and the scale sub-layers include multiple scale units 3211 overlapping along the length direction of the tool.

[0068] In these embodiments, the multilayered flake structure possesses a three-dimensional multilayered structure. That is, it has layered gradients in the length, width, and thickness directions. This multilayered flake structure, with its multi-directional stacked structure, exhibits superior impact resistance, effectively suppresses brittle fracture at the cutting edge, and its multilayered morphology prevents chipping or burring, thereby further enhancing the tool's sustained sharpness. In particular, the multilayered structure with varying hardness in the thickness direction allows the material's toughness to inhibit further inward fracture propagation, thus suppressing brittle fracture at the cutting edge. Furthermore, the multilayered flake structure allows for interlaminar sliding, absorbing energy and reducing chipping.

[0069] Correspondingly, the manufacturing method of cutting tools can construct a multi-layered scaly structure by controlling the spraying process of hard materials, or by utilizing the inherent structure of the specific scaly material itself.

[0070] The following describes specific embodiments of constructing a multi-layered, scaly structure by controlling the spraying process of a hard material.

[0071] In this application, a hard material is used to form molten droplets under specific conditions (such as thermal melting). When the droplets come into contact with the tool body or with a partially formed scale-like structure, they spread out to form scale rudiments with a certain shape and size. By using the hard material to form droplets at intervals, the previous droplet in an adjacent droplet completes its spread and forms a rudiment before the next droplet forms. The new droplet is then allowed to fuse with the previous scale rudiment, causing adjacent scale units to overlap. In this way, a scale-like structure can be constructed on the tool body. As an example, the hard material can be used to form droplets at intervals through methods such as arc welding. The interval time can be no less than 0.05 s, specifically between 0.05 s and 0.5 s, for example, but not limited to, 0.1 s to 0.4 s or 0.2 s to 0.3 s.

[0072] As some specific embodiments, the steps of forming a multi-layered flake structure include: moving a hard material along the length direction of the tool and forming flake sublayers by overlapping adjacent molten droplet-structured flake monomers; forming multiple flake sublayers along the width direction of the tool and connecting adjacent flake sublayers to form a flake-like layer; and sequentially stacking multiple flake-like layers in the thickness direction of the tool body to form the multi-layered flake structure. As some specific embodiments, the steps of forming a multi-layered flake structure include: moving a hard material along the length direction of the tool and forming flake-like layers by overlapping adjacent molten droplet-structured flake monomers; and sequentially stacking multiple flake-like layers in the thickness direction of the tool body to form the multi-layered flake structure.

[0073] In these embodiments, droplets are formed from hard materials. Under the influence of gravity, these droplets spread and flatten, and external temperatures cause them to solidify into a semi-solid state, thus creating scale-like rudiments (soft materials with a basic scale-like structure, partially solidified but still retaining some plasticity). These scale-like rudiments possess a certain degree of morphological stability, unaffected by subsequent droplets, and facilitate metallurgical bonding with the scale-like rudiments formed by subsequent droplets, thereby further enhancing the overall strength of the scale-like structure. Furthermore, the overlapping structure between adjacent scale units absorbs and disperses the impact energy generated during cutting, reducing tool damage and breakage due to impact and improving the tool's impact resistance.

[0074] In other embodiments, the surface accommodating the groove has arcuate irregularities, which facilitates the formation of flat, scaly monomers from the molten droplets under the influence of surface tension, thereby forming a scaly structure.

[0075] According to this application, any heat source in the prior art can be used as the heat source capable of inducing the formation of molten droplets in hard materials. As an example, the formation of molten droplets in hard materials can be induced by welding. Specifically, this can be arc welding or plasma welding. As an example, the temperature controlled by the heat source is within the range of 1500℃-3000℃.

[0076] In some embodiments, the parameters for arc welding include a welding current of 100-500A, a welding voltage of 20-40V, and a welding speed of 0.1cm / s-1cm / s.

[0077] In some embodiments, the rigid material is in the form of strips, which are welded into droplets using a welding power of 2kW-20kW. The strip-shaped rigid material can also be called rigid filament. The outer radius of the rigid filament is 0.3mm-1.5mm, and the inner radius is no greater than 0.5mm (when the inner radius is 0, a solid rigid filament is used), thereby controlling the surface area of ​​the individual flakes to 10mm². 2 -100mm 2 And the thickness is 100μm-500μm.

[0078] In these embodiments, by controlling the welding power and the size of the hard material, the size of the formed droplets can be controlled appropriately, thereby enabling the manufacture of individual scales that meet the requirements for the long-term sharpness of the cutting tool, thus laying the groundwork for constructing a suitable scale-like structure.

[0079] In some embodiments, by controlling the moving speed of the strip-shaped hard material to be 0.1 cm / s-1 cm / s, the overlapping area of ​​adjacent scale units in the length direction is 10%-80% of the area of ​​a single scale unit, so as to obtain scale sub-layers. In this way, the cutting edge of the formed tool also has a layered gradient in the length direction. Thus, the multi-layer scale structure has suitable impact resistance and bonding force, which can suppress brittle fracture of the cutting edge, avoid chipping or rolling, and thus further improve the tool's lasting sharpness.

[0080] In this application, the strip-shaped hard material is a material with a hardness greater than 450HV-1200HV, selected from inorganic materials, specifically metallic materials or metal composite materials. As an example, the strip-shaped hard material can be at least one of the following: titanium, titanium alloys, martensitic stainless steel, molybdenum series alloys, tool steel alloys, nickel-based alloys, cobalt-based alloys, and flux-cored materials. These alloys possess high hardness, and by forming a cutting edge with a hardness gradient together with a portion of the aforementioned tool body, the tool possesses good impact toughness, preventing chipping or rolling.

[0081] As specific examples, molybdenum series alloys include nickel-molybdenum alloys and chromium-molybdenum alloys, while tool steel alloys include alloys composed of iron, carbon, tungsten (W), molybdenum (Mo), and vanadium (V).

[0082] According to this application, the core material can be a composite filament, specifically a composite filament in which sheet-like ceramic material is dispersed within a metal filament. The sheet-like ceramic material in this composite filament can promote the spreading of molten droplets into a scaly shape, ensuring the uniformity of the scaly monomers, thereby directly affecting the quality of the scaly structure. Furthermore, the ceramic material can serve as a reinforcing phase to further improve the wear resistance of the multilayer scaly structure.

[0083] In some embodiments, the core material is a filament with a radius in the range of 0.3 mm to 1.5 mm. This type of filament is conducive to forming droplets of appropriate size under the influence of a heat source, thereby laying the foundation for forming the scale monomers required in this application, and thus facilitating the construction of the scale-like structure required for the cutting tool of this application.

[0084] As a specific example, the thickness of the sheet-like ceramic material is 10μm-50μm; the main surface area of ​​the sheet-like ceramic material is 1mm². 2 -10mm 2 This size of sheet-like ceramic material can be dispersed in metal wires and can reduce surface tension to promote further spread of molten droplets.

[0085] In these embodiments, the core material is a composite filament of metal wire and sheet-like ceramic material (non-metallic compound). Under the influence of a heat source, the metal material in the metal wire at the front end of this composite filament can completely melt into molten metal, causing the sheet-like ceramic material to drip down with it. Since the temperature provided by the heat source has not yet reached its melting point, this ceramic material does not melt but remains dispersed in the molten metal. Therefore, when forming a flake-like structure using this composite filament, the metal wire in the composite filament acts as a binder, forming molten metal to fully wet the surface of the tool body. The sheet-like ceramic material in the composite filament can be flattened by buoyancy and gravity in the molten metal, promoting the lateral spread of the molten metal. This results in a more uniform, multi-layered flake-like structure, reducing stress on the tool structure and increasing overall strength, thereby further improving the tool's sustained sharpness. Furthermore, the flake-shaped ceramic material can be buoyed in the molten metal and become flush with the surface of the tool body, thereby further forming layers within the individual flakes of the flake structure, increasing the number of layers in the flake structure of this application and improving the strength of the tool. In addition, the flake-shaped ceramic material can form a metallurgical bond with the tool body through the molten metal, thereby improving the tool's long-lasting sharpness from the perspective of bonding strength.

[0086] In some embodiments, the plate-like ceramic material is a ceramic material with a hardness in the range of 1500HV-2500HV, specifically including plate-like oxides, plate-like carbides, plate-like nitrides, and plate-like borides. Specifically, the plate-like carbides include at least one of plate-like titanium carbide, plate-like titanium carbonitride, plate-like silicon carbide, plate-like boron carbide, plate-like tantalum carbide, plate-like niobium carbide, plate-like tungsten carbide, and plate-like tungsten dicarbide; the plate-like nitrides include at least one of plate-like titanium nitride, plate-like titanium aluminum nitride, plate-like silicon nitride, plate-like cubic boron nitride, and plate-like aluminum nitride; the plate-like oxides include at least one of plate-like alumina and plate-like zirconium dioxide; and the plate-like borides include at least one of plate-like titanium diboride and plate-like zirconium diboride. The metal wire is an alloy wire with a hardness in the range of 500HV-800HV, specifically at least one of Ti alloy wire, tungsten alloy wire, nickel alloy wire, chromium alloy wire and stainless steel wire.

[0087] In some embodiments, the weight ratio of metal wire to sheet ceramic material is (100:1)-(300:1). Composite wires with a suitable weight ratio of metal wire and ceramic material can possess multiple excellent properties, such as strong bonding with the tool body, uniformity of scales, and good wear resistance.

[0088] This application provides a method for manufacturing a core material, specifically by providing a metal strip with multiple grooves on its surface; filling the grooves with sheet-like ceramic material; then rolling it into at least one layer of composite roll; and then reducing the diameter and stretching the composite roll to obtain a composite wire material in which sheet-like ceramic material is incorporated into the metal wire.

[0089] The following will describe specific embodiments of constructing multi-layered flake structures using the inherent structure of specific flake materials.

[0090] In this application, the step of forming a multi-layered flake-like structure in the receiving groove includes spraying a flake-like hard material such that the surface of the flake-like hard material is slightly melted while the interior is not melted, thereby forming a multi-layered flake-like structure in the receiving groove by sequentially stacking flake-like individual flakes of the flake-like hard material.

[0091] In these embodiments, by using a hard material with its own scaly structure to only slightly melt the surface during the spraying process, a cladding layer with a multi-layered scaly structure is formed by stacking the hard material with its own scaly structure. This simplifies the formation of the cladding layer with a multi-layered scaly structure and reduces manufacturing costs.

[0092] In some embodiments, the spraying distance is controlled to be 5cm-30cm, the pressure to be 0.1bar-0.5bar, and the main surface area of ​​the flake-like material to be 10mm².2 -100mm 2 And the thickness is 100μm-500μm, thus obtaining a thickness of 10mm. 2 -100mm 2 The surface area and the thickness of the flake monomers are 100μm-500μm.

[0093] In these embodiments, by controlling the welding power and the size of the hard material, it is possible to control the scaly hard material to melt only on the surface and not inside, thereby using the scaly material’s own structure to manufacture scaly monomers of the desired size, which can lay the groundwork for constructing a suitable scaly structure.

[0094] In this application, the flake-like hard material can be at least one of the following: titanium, titanium alloys, martensitic stainless steel, molybdenum series alloys, tool steel alloys, nickel-based alloys, cobalt-based alloys, and flux-cored materials. These alloys possess high hardness and, together with a portion of the aforementioned tool body, form a cutting edge with suitable hardness, thereby ensuring appropriate cutting edge hardness, good impact resistance, and preventing chipping or rolling.

[0095] Angled grinding According to this application, a double-sided sharpening operation is performed on the tool body with the connected multi-layered scale-like structure. The cutting edge of the tool is formed by grinding the multi-layered scale-like structure and the tool body together, and this cutting edge serves as the cutting edge of the tool. The multi-layered scale-like structure at the cutting edge is the portion remaining after grinding the multi-layered scale-like structure formed in the receiving groove.

[0096] Figure 7 This is a schematic diagram of a tool body with a multi-layered scale-like structure according to an embodiment of the present invention. (Refer to...) Figure 7 , can be followed in sequence Figure 7 AA ， And BB ， The dotted lines shown are polished to create a shape with... Figure 10 The cutting edge of the tool is shown.

[0097] In a preferred embodiment, the bottom wall of the receiving groove coincides with the centerline S1 in the thickness direction, AA ， And BB ， The dashed line shown is the centerline S1 intersecting the thickness direction, and is symmetrical about the centerline S1 in the thickness direction.

[0098] According to this application, refer to Figures 8 to 10The multi-layered scale-like structure 32 includes multiple scale-like layers stacked along the thickness direction. It can also be understood that the multiple scale-like layers are arranged sequentially from the bottom of the groove 20 to the opening of the groove. Each scale-like layer 321 includes multiple scale sub-layers arranged along the width direction of the tool, and the scale sub-layers include multiple scale units 3211 that are stacked along the length direction of the tool.

[0099] In this application, the multi-layered scaly structure of the cutting edge is the remaining portion after grinding the multi-layered scaly structure formed in the receiving groove. The multi-layered scaly structure is formed at high temperature, and the material has large internal stress. The internal stress will exacerbate the occurrence of brittle fracture. Setting the scaly structure as a multi-layered structure can disperse the impact load, relieve the internal stress, avoid local stress concentration, and form the cutting edge of the tool together with the tool body in a soft and hard composite process, thereby improving the tool's long-term sharpness.

[0100] In some embodiments, the multiple flake-like layers arranged in the thickness direction support each other, effectively resisting external forces generated during cutting and improving the overall strength and durability of the tool. In a preferred embodiment, the multiple flake-like layers arranged in the thickness direction have different hardnesses, thereby creating a hardness gradient in the thickness direction within the multi-layer flake-like structure. This further enhances the impact toughness of the tool with the multi-layer flake-like structure and improves the tool's sustained sharpness.

[0101] In the embodiments of this application, the hard materials forming adjacent scaly layers can have different hardnesses, thereby forming scaly layers with different hardnesses. This results in a hardness gradient in the multi-layered scaly structure. In the subsequent oblique grinding process, the scaly layers forming the cutting edge can further refine the micro-serration structure of the tool due to the hardness gradient, thereby further improving the long-lasting sharpness.

[0102] According to this application, the hardness of the hard materials in adjacent flake layers of the multilayer flake structure is different. As an example, the hardness difference between adjacent flake layers in the thickness direction is in the range of 30HV-100HV, which can reduce the internal stress at the cutting edge and reduce the brittleness of the material at the cutting edge.

[0103] According to this application, the multi-layered flake structure 32 includes multiple flake layers 321 stacked along the thickness direction of the tool. Each flake layer 321 includes multiple sub-layers of flakes arranged along the width direction of the tool. Each sub-layer of flakes includes multiple individual flakes 3211 overlapping along the length direction of the tool. The overlapping individual flakes 3211 can better disperse stress and improve the impact resistance of the multi-layered flake structure, thereby further enhancing the tool's sustained sharpness. Furthermore, the overlapping and supporting relationship between adjacent flakes ensures that when one layer of flakes wears, the other layers can continue to function, effectively preventing the rapid spread of wear to the substrate, thus significantly improving the tool's wear resistance and extending its service life.

[0104] According to a second aspect of this application, a knife is provided, specifically relating to a kitchen knife, wherein the knife 30 includes a base portion and the cutting edge portion of the knife includes a multi-layer structure, the multi-layer structure being disposed (connected) on one side of the base portion and forming the cutting edge 31 of the knife together with the base portion.

[0105] According to the embodiments of this application, the cutting edge of the tool has a composite structure of a multi-layered structure and a tool body. The tool body provides support for the multi-layered structure, allowing it to withstand external forces together with the multi-layered structure and preventing delamination. The multi-layered structure possesses suitable impact toughness and interlayer bonding strength, preventing chipping or delamination, thereby ensuring the tool's long-lasting sharpness. Furthermore, the microscopic interlayer gaps of the multi-layered structure form a micro-serrated structure at the cutting edge, enabling the tool to exhibit better cutting performance.

[0106] In some embodiments, when the hardness of the tool body is greater than 600 HV, the hardness of at least a portion of the multilayer structure is equal to or greater than the hardness of the tool body; when the hardness of the tool body is between 400 HV and 600 HV, the hardness of at least a portion of the multilayer structure is greater than the hardness of the tool body, and greater than or equal to 600 HV. Here, the hardness of at least a portion of the multilayer structure being greater than the hardness of the tool body can include either the hardness of all regions of the multilayer structure being greater than the hardness of all regions of the tool body, or the hardness of a localized region of the multilayer structure being greater than the hardness of all regions of the tool body. In these embodiments, when the hardness of the tool body is greater than 600 HV, the tool body is at or above the critical hardness value where it will not scuff but is prone to chipping. In this case, the hardness of the multilayer structure is equal to or greater than the hardness of the tool body. This is to compensate for the increased brittleness of the tool due to high hardness by utilizing the appropriate impact toughness and interlayer bonding strength of the multilayer structure. Therefore, the possibility of chipping due to high hardness can be reduced, and the tool's sustained sharpness can be improved. When the hardness of the tool body is between 400 HV and 600 HV, the hardness of the tool body is in the range where it is prone to scuffing but will not chip. In this case, the hardness of at least a portion of the multilayer structure can be greater than the hardness of the tool body, and greater than or equal to 600 HV. Thus, at least a portion of the multi-layered structure (the first region) ensures that the cutting edge obtained by combining the multi-layered structure and the tool body has improved overall hardness. Since at least a portion of the multi-layered structure is part of the multi-layered structure, it also has a layered structure. The layered structure has suitable impact toughness and interlayer bonding strength. Through the synergistic effect of the layered structure and the high hardness of the partial region, the possibility of chipping due to the high hardness of the multi-layered structure can be reduced. In this way, the tool is not easy to chip or roll, thus ensuring the tool's long-lasting sharpness.

[0107] In an exemplary embodiment, when the hardness of at least a portion of the multilayer structure is greater than the hardness of the tool body, the hardness difference between the at least a portion of the multilayer structure and the tool body is 50HV-200HV. In this way, the impact toughness of the multilayer structure can be used to further reduce the occurrence of chipping due to the hardness of the multilayer structure being at or above the hardness threshold that makes it easy to chip. This ensures that the cutting edge of the tool is not easy to chip or roll, thereby further improving the tool's long-lasting sharpness.

[0108] In an exemplary embodiment, where the hardness of at least a portion of the multilayer structure is greater than the hardness of the tool body, taking the total volume of the multilayer structure as 100%, the volume of the portion of the multilayer structure accounts for 70%-100% of the total volume of the multilayer structure. In other words, the volume of the portion of the multilayer structure is not less than 70% of the total volume of the multilayer structure. This ensures that the multilayer structure has a suitable proportion of high-hardness portions, which, together with the tool body, guarantee an improved overall hardness at the cutting edge, thereby further enhancing the tool's wear resistance and preventing edge chipping.

[0109] In a specific embodiment, the multi-layer structure also includes a second region (low-hardness region) in addition to the first region (high-hardness region). The hardness of the second region is less than that of the first region. The first and second regions are alternately arranged. The hardness of the second region is greater than, equal to, or less than that of the tool body. The second region serves as a buffer and connects the first region and the tool body to ensure the overall bonding performance of the cutting edge. The second region is a part of the multi-layer structure other than the first region. The volume ratio of the second region can be 0%-30%. In other words, the volume of the second region does not exceed 30% of the total volume of the multi-layer structure.

[0110] It should be noted that, in this application, the multi-layer structure having both the first region and the second region can be composed of a single core filament or alternating layers of hard materials with different hardness. This application does not impose any restrictions on this, and the location of the regions can be arbitrary.

[0111] As a specific example, refer to Figures 8 to 12 In the cutting tool 30, the tool body 10 can be divided into a first body region 13 located above and a second body region 14 connected below the first body region. The first body region 13 is disposed above the multi-layer structure and constitutes the blade of the cutting tool. The second body region 14 protrudes relative to the lower end face of the first body region 13 and is disposed adjacent to the multi-layer structure along the thickness direction of the cutting tool. Together with the multi-layer structure, it forms the cutting edge of the cutting tool and serves as the cutting edge of the cutting tool.

[0112] In this application, through the Figure 7 The tool shown is double-edged, thus forming a tool that simultaneously has a second body region 14 and a multi-layered cutting edge.

[0113] In these embodiments, the cutting edge of the tool, with its multi-layered structure and a combination of hard and soft materials, possesses suitable impact toughness and interlayer bonding strength, preventing chipping or rolling and thus ensuring the tool's long-lasting sharpness. Furthermore, the structure of the cutting edge allows for the formation of micro-serrations, resulting in improved cutting performance.

[0114] According to this application, the sub-layers in the multi-layer structure can be stacked in any direction. In exemplary embodiments, the sub-layers can be stacked along the thickness, width, or length direction of the blade. In a preferred embodiment, the sub-layers in the multi-layer structure are stacked along the width direction, thus corresponding to the force direction of cutting food, thereby reducing the possibility of blade chipping through multi-layer composite. In a more preferred embodiment, the multi-layer structure is formed as a multi-layer scale-like structure, which has a three-dimensional or two-dimensional multi-layer structure. The multi-dimensional structure can withstand mechanical impacts from different directions, especially in multi-scenario applications such as chopping meat (blade direction) and smashing garlic (blade perpendicular direction). The multi-layer structure can disperse impact loads and avoid local stress concentration.

[0115] In the first embodiment, as Figures 8 to 10 As shown, the multi-layered scale-like structure 32 includes multiple scale-like layers 321 stacked along the thickness direction of the tool, and the scale-like layers 321 include multiple scale sub-layers arranged along the width direction of the tool, and the scale sub-layers include multiple scale units 3211 overlapping along the length direction of the tool.

[0116] In these embodiments, the defined multi-layered scale-like structure has a three-dimensional multi-layered structure. That is, it has layered gradients in the length, width, and thickness directions. Thus, the multi-layered scale-like structure has suitable impact resistance and can effectively suppress brittle fracture at the cutting edge, avoiding chipping or rolling, thereby further improving the long-term sharpness of the tool.

[0117] In the second embodiment, as Figure 11 and Figure 12 As shown, the multi-layered scale-like structure 32 includes multiple scale-like layers 321 stacked along the thickness direction of the tool, and the scale-like layers 321 include multiple scale units 3211 arranged in an overlapping manner along the length direction of the tool.

[0118] In these embodiments, the defined multi-layered scale-like structure has a two-dimensional multi-layered structure. That is, it has layered gradients in both the length and thickness directions. Thus, the multi-layered scale-like structure has suitable impact resistance and can effectively suppress brittle fracture at the cutting edge, avoiding chipping or rolling, thereby further improving the long-term sharpness of the tool.

[0119] In some embodiments, the multiple scale-like layers 321 stacked in the thickness direction of the tool are arranged alternately with varying hardness. In this way, adjacent scale-like layers 321 can overlap and support each other. When a certain scale layer wears out, the other layers can still continue to function, effectively preventing wear from spreading rapidly to the substrate, thereby significantly improving the wear resistance of the tool and extending its service life.

[0120] In some embodiments, the receiving groove is a square groove. In the receiving groove, the thickness of the flake layer 321 is 100μm-500μm, and the thickness of the multilayer flake structure 32 is 400μm-1500μm. At the cutting edge of the tool, the thickness of the flake layer 321 is 100μm-500μm, and the thickness of the thickest part of the multilayer flake structure 32 is 400μm-1500μm. Here, the thickness of the thickest part of the multilayer flake structure 32 is the thickness of the upper end of the multilayer flake structure 32 that contacts the tool body.

[0121] In some embodiments, the inner wall of the receiving groove may be a continuous concave arc surface (without abrupt corners) or a surface with abrupt corners (corners), for example, a T-shape. It should be noted that this application does not intentionally limit the shape of the inner wall of the receiving groove.

[0122] In the third embodiment, as Figure 13 As shown, the cross-section of the inner wall of the accommodating groove is concave arc-shaped. In the corresponding manufacturing method, the molten droplet can start from the central region at the bottom of the groove and expand outward layer by layer along the arc-shaped surface to form uninterrupted scale-like monomers, ultimately constructing a multi-layered scale-like structure. This avoids the molten droplet from being affected by gravity or inertial displacement, thus preventing the formation of the multi-layered scale-like structure.

[0123] In a specific embodiment, the inner wall of the receiving groove is a continuous concave arc surface. The inner wall of the receiving groove with a continuous concave arc surface does not have abrupt angles. Therefore, when forming a multi-layered scale structure, it can provide better adhesion conditions for the molten droplet than an inner wall with abrupt angles (e.g., the square groove mentioned above). It can guide the molten droplet to transition smoothly along the continuous concave arc surface, thereby ensuring the continuity of the scale-like monomers and the bonding of each region inside the multi-layered scale structure.

[0124] According to this application, the multi-layered flake structure is stacked using a traditional alignment mechanism or a staggered overlapping method. Both the multi-layered flake structure stacked using the alignment mechanism and the multi-layered flake structure stacked using the staggered overlapping method exhibit significant impact resistance and interlayer bonding strength, thereby improving the long-term sharpness of the cutting tool. In particular, the multi-layered flake structure stacked using the staggered overlapping method can absorb external forces layer by layer and form a good mechanical interlocking effect, thus exhibiting significant impact resistance and interlayer bonding strength.

[0125] In some embodiments, the surface area of ​​the flake monomer is 10 mm. 2 -100mm 2 And the thickness is 100μm-500μm; and / or, the overlap area of ​​adjacent scale monomers in the length direction is 10%-80% of the area of ​​a single scale monomer.

[0126] In these embodiments, the scale sub-layers composed of the aforementioned scale monomers have a tightly stacked structure, thereby ensuring the tightness of the scale-like layers formed by the stacking of multiple scale sub-layers. This, in turn, enables the tight bonding of the multi-layer scale-like structure formed by the stacking of multiple scale-like layers, resulting in a tight three-dimensional multi-layer structure. The multi-layer scale-like structure has suitable impact resistance and can effectively suppress brittle fracture at the cutting edge, avoiding chipping or rolling, thereby further improving the long-lasting sharpness of the tool.

[0127] In some embodiments, multiple scale-like sub-layers are staggered and overlapped along the width direction of the tool. This arrangement of scale-like sub-layers in the width direction creates a layered structure in the tool, resisting external forces from that direction. Furthermore, when an external force acts on the tool's width, the staggered scale-like sub-layers absorb energy layer by layer through localized deformation, sliding, or micro-fractures, rather than concentrating it at a single cross-section, thus further reducing the risk of edge chipping. Similarly, multiple scale-like layers stacked in the thickness direction are staggered and overlapped. This arrangement of scale-like layers in the thickness direction creates a layered structure in the tool's thickness direction, resisting external forces from that direction. Furthermore, when an external force acts on the tool's thickness, the staggered scale-like sub-layers absorb energy layer by layer through localized deformation, sliding, or micro-fractures, rather than concentrating it at a single cross-section, thus further reducing the risk of edge chipping.

[0128] According to this application, in the cutting tool, the centerline in the thickness direction of the cutting tool is S2. The bottom wall of the receiving groove 20 coincides with S2, is parallel to S2, and has a distance of no more than 5 mm between it and S2, or is slightly inclined relative to S1 (for example, the inclination angle is no more than 10°). The multi-layered scale-like structure is arranged sequentially along the groove bottom to the groove opening. In this way, the multi-layered scale-like structure can have a large filling amount in the thickness direction of the cutting tool, thereby improving the long-term sharpness of the cutting tool.

[0129] Reference Figure 10 The centerline in the thickness direction of the tool is S2, and the bottom of the groove that accommodates the groove coincides with S2.

[0130] In the manufactured cutting edge of the tool, the outer surface of the multi-layered, scale-like structure serves as the first cutting face, and a portion of the outer surface of the tool body serves as the second cutting face opposite to the first cutting face. The angle between the first cutting face and S2 is θ1, and the angle between the second cutting face and S2 is θ2. The cutting edge with a cut-off angle of θ1 and θ2 is θ, where θ1 is 5°-20°, θ2 is 5°-20°, and the sum of θ1 and θ2 is θ. A cutting edge with a suitable cut-off angle facilitates cutting and improves the cutting experience.

[0131] According to this application, the hardness of the multi-layered scaly structure is greater than that of the tool body. During the cutting process, the scaly structure can withstand greater friction and impact, effectively reducing the wear of the tool body and extending the tool's service life.

[0132] In some embodiments, the hardness difference between the scale-like structures arranged sequentially in the thickness direction and the tool body is 50HV-200HV, which can construct a suitable hardness gradient in the thickness direction of the cutting edge of the tool to ensure the impact toughness of the cutting edge in the thickness direction.

[0133] Specifically, the hardness of the tool body can be in the range of 400HV-1000HV, and the material forming the tool body includes at least one of carbon steel, 3Cr13 stainless steel, 4Cr13 stainless steel, 5Cr15MoV stainless steel, 7Cr13MoV stainless steel, 8Cr13MoV stainless steel, and 9Cr18MoV stainless steel. The multi-layered flake-like structure is composed of strip-shaped or sheet-shaped hard materials, including at least one of titanium, titanium alloys, martensitic stainless steel, molybdenum series alloys, tool steel alloys, nickel-based alloys, cobalt-based alloys, and composite wires in which flake-shaped ceramic materials are dispersed. In this way, a cutting edge of a tool can be obtained that possesses excellent properties in terms of impact toughness, corrosion resistance, and food contact safety.

[0134] In some embodiments, the multi-layered flake structure is formed by welding, thermal spraying, or cladding, and the formation methods are diverse, which can simplify the manufacturing process of the cutting tool.

[0135] According to this application, a multi-layered flake-like structure extends in the width direction of the cutting tool. In some embodiments, the multi-layered flake-like structure extends from the cutting edge along the width direction to a region corresponding to a width of 0.1mm-10mm from the cutting edge. This ensures that the tool retains a usable multi-layered flake-like structure even after continuous sharpening, thereby improving the tool's long-term sharpness. When the distance is less than 0.1mm, the process is difficult to implement, and it cannot be confirmed that the cutting edge will have cladding material after sharpening. Furthermore, the small distance makes it difficult to achieve a multi-layered structure. When the distance is greater than 10mm, the cost is high and the improvement in lifespan is not significant.

[0136] In some embodiments, the cutting tool includes a cutting action area and non-cutting action areas located at both ends of the cutting action area along its length. The multi-layer structure is formed at least on the cutting action area, thereby ensuring the long-term sharpness of the cutting action area and reducing costs while maintaining the long-term sharpness of the cutting tool.

[0137] The beneficial effects of the present invention will be described in more detail below with reference to specific embodiments.

[0138] Example 1 The cutting tool according to Example 1 is prepared by the following method.

[0139] Step S10: Provide a tool body with a thickness of 2mm and uniform thickness. The tool body is made of 4Cr13 stainless steel.

[0140] In step S20, a rectangular receiving groove with a length of 180 mm (blade length is 180 mm), a width of 10 mm, and a depth of 1 mm is formed by extending the end of the tool body in the width direction. The bottom wall of the receiving groove coincides with the centerline of the tool body in the thickness direction, thereby forming the tool body.

[0141] In step S30, a strip-shaped titanium-tungsten alloy wire with a diameter of 1.0 mm and an inner diameter of 0.3 mm is welded at a power of 10 kW. The resulting droplets are spaced 0.2 s apart, allowing them to spread and form a scale-like structure before the next droplet is formed. This allows the next droplet to fuse with the scale-like structure, resulting in overlapping scale units of adjacent scale-like structures to form a scale-like structure. The surface area of ​​the scale unit in the receiving groove is 10 mm². 2 -30mm 2 The thickness is 300μm-500μm, so that the receiving groove of the tool body is filled through a 3-layer scale-like structure.

[0142] Step S40: Perform oblique grinding with the centerline in the thickness direction as a reference (e.g., refer to...). Figure 7 (The auxiliary lines shown are used for oblique grinding), thereby forming the cutting tool according to Embodiment 1 of this application.

[0143] Example 2 Except that the tool body is made of 5Cr15MoV stainless steel instead of 4Cr13 stainless steel, the tool of Example 2 is manufactured using the same method as in Example 1.

[0144] Example 3 Except for using carbon steel with a carbon content of 0.9% instead of 4Cr13 stainless steel to make the knife body, the knife of Example 3 was manufactured using the same method as in Example 1.

[0145] Example 4 Except that the tool body is made of 7Cr17MoV stainless steel instead of 4Cr13 stainless steel, the tool of Example 4 is manufactured using the same method as in Example 1.

[0146] Example 5 Except for using tool steel alloy wire instead of titanium-tungsten alloy wire in Example 1 to form a multi-layered scale structure, the tool of Example 5 was manufactured using the same method as in Example 1.

[0147] Example 6 Except for using a tool molybdenum series alloy to replace the titanium-tungsten alloy wire in Example 1 to form a multi-layered scale structure, the tool of Example 6 was manufactured using the same method as in Example 1.

[0148] Example 7 In addition to using composite wire (the composite wire is a mixture of titanium-tungsten alloy wire and uniformly dispersed sheet-like ceramic material, wherein the dispersed sheet-like ceramic material is tungsten carbide with a surface area of ​​1 mm²), 2 -10mm 2 In addition to forming a multi-layered scaly structure with a thickness of 10μm-50μm, the tungsten carbide volume being 20% ​​of the total volume of the composite wire and the titanium-tungsten alloy wire volume being 85% of the total volume of the composite wire, the tool of Example 7 was manufactured using the same method as in Example 1.

[0149] Example 8 In addition to using another type of composite wire (the composite wire is a mixture of titanium-tungsten alloy wire and uniformly dispersed sheet-like ceramic material, wherein the dispersed sheet-like ceramic material is zirconium oxide with a surface area of ​​1 mm²), another type of composite wire is used. 2 -10mm 2 In addition to forming a multi-layered scaly structure with a thickness of 10μm-50μm, the volume of zirconium oxide being 20% ​​of the total volume of the composite wire, and the volume of titanium-tungsten alloy wire being 85% of the total volume of the composite wire, the tool of Example 8 was manufactured using the same method as in Example 1.

[0150] Example 9 In addition to using another type of composite wire (the composite wire is a mixture of titanium-tungsten alloy wire and uniformly dispersed sheet-like ceramic material, wherein the dispersed sheet-like ceramic material is silicon nitride with a surface area of ​​1 mm²), another type of composite wire is used. 2 -10mm 2 In addition to forming a multi-layered scaly structure with a thickness of 10μm-50μm, the silicon nitride volume being 20% ​​of the total volume of the composite wire and the titanium-tungsten alloy wire volume being 85% of the total volume of the composite wire, the tool of Example 9 was manufactured using the same method as in Example 1.

[0151] Example 10 In addition to using another type of composite wire (the composite wire is a mixture of titanium-tungsten alloy wire and uniformly dispersed sheet-like ceramic material, wherein the dispersed sheet-like ceramic material is titanium boride with a surface area of ​​1 mm²), another type of composite wire is used. 2 -10mm 2In addition to forming a multi-layered scaly structure with a thickness of 10μm-50μm, the volume of titanium boride being 20% ​​of the total volume of the composite wire, and the volume of titanium-tungsten alloy wire being 85% of the total volume of the composite wire, the tool of Example 10 was manufactured using the same method as in Example 1.

[0152] Example 11 In addition to using another type of composite wire (the composite wire is a mixture of titanium-tungsten alloy wire and uniformly dispersed sheet-like ceramic material, wherein the dispersed sheet-like ceramic material is tungsten silicide with a surface area of ​​1 mm²), another type of composite wire is used. 2 -10mm 2 In addition to forming a multi-layered scaly structure with a thickness of 10μm-50μm, the volume of tungsten silicide is 20% of the total volume of the composite wire, and the volume of titanium-tungsten alloy wire is 85% of the total volume of the composite wire, the tool of Example 11 was manufactured using the same method as in Example 1.

[0153] Example 12 In addition to the fact that the area of ​​the formed scale individual is 30mm 2 -70mm 2 The tool of Example 12 was manufactured using the same method as in Example 1, with a thickness of 200μm-300μm (controlled by power control at 12kW).

[0154] Example 13 In addition to the fact that the area of ​​the formed scale individual is 70mm 2 -100mm 2 The tool of Example 13 was manufactured using the same method as in Example 1, with a thickness of 100μm-200μm (by controlling 16kW).

[0155] Example 14 The cutting tool according to Example 14 is prepared by the following method.

[0156] Step S10: Provide a tool body with a thickness of 2mm and uniform thickness. The tool body is made of 4Cr13 stainless steel.

[0157] In step S20, a rectangular receiving groove with a length of 180 mm (the blade length is 180 mm), a width of 10 mm, and a depth of 1 mm is formed by extending the end of the tool body in the width direction. The bottom wall of the receiving groove coincides with the centerline of the tool body in the thickness direction, thereby forming the tool body.

[0158] Step S30: Use titanium-tungsten alloy sheet (main surface area 10mm²) 2 -100mm 2A scaly structure (with a thickness of 300μm-500μm) is formed by plasma spraying at a distance of 15cm and a pressure of 0.3bar. The area of ​​each scaly element in the scaly structure is 10mm². 2 -30mm 2 The thickness is 300μm-500μm, so that the receiving groove of the tool body is filled through a 3-layer scale-like structure.

[0159] Step S40: Perform oblique grinding with the centerline in the thickness direction as a reference (e.g., refer to...). Figure 7 (The auxiliary lines shown are used for oblique grinding), thereby forming the cutting tool according to Embodiment 14 of this application.

[0160] Example 15 Except that the tool body is made of 5Cr15MoV stainless steel instead of 4Cr13 stainless steel, the tool of Example 15 is manufactured using the same method as in Example 14.

[0161] Example 16 Except for using carbon steel with a carbon content of 0.9% instead of 4Cr13 stainless steel to make the tool body, the tool of Example 16 was manufactured using the same method as in Example 14.

[0162] Example 17 Except that the tool body is made of 7Cr17MoV stainless steel instead of 4Cr13 stainless steel, the tool of Example 17 is manufactured using the same method as in Example 14.

[0163] Example 18 Except for using another scaly material (4Cr13 stainless steel sheet) to make a multi-layer scaly structure, the tool of Example 18 was manufactured using the same method as in Example 14.

[0164] Comparative Example 1 Except that a titanium-tungsten alloy wire with dispersed tungsten carbide particles was used to replace the composite wire of Example 7, the cutting tool of Comparative Example 1 was manufactured using the same method as in Example 7.

[0165] Comparative Example 2 Except for using 4Cr13 stainless steel particles and filling the receiving groove in step S20 by plasma spraying, the cutting tool of Comparative Example 2 was manufactured using the same method as in Example 1.

[0166] Comparative Example 3 Except for using tungsten carbide particles and plasma spraying to fill the receiving groove in step S20, the cutting tool of Comparative Example 3 was manufactured using the same method as in Example 1.

[0167] Comparative Example 4 Except that a titanium-tungsten alloy wire with dispersed zirconium oxide particles was used to replace the composite wire of Example 8, the cutting tool of Comparative Example 4 was manufactured using the same method as in Example 8.

[0168] Comparative Example 5 Except that a titanium-tungsten alloy wire with dispersed silicon nitride particles was used to replace the composite wire of Example 9, the cutting tool of Comparative Example 5 was manufactured using the same method as in Example 9.

[0169] Comparative Example 6 Except that a titanium-tungsten alloy wire with dispersed titanium boride particles was used to replace the composite wire of Example 10, the cutting tool of Comparative Example 6 was manufactured using the same method as in Example 10.

[0170] Comparative Example 7 Except that a titanium-tungsten alloy wire with dispersed tungsten silicide particles was used to replace the composite wire of Example 11, the cutting tool of Comparative Example 7 was manufactured using the same method as in Example 11.

[0171] Performance metrics testing The cutting edge thickness of the tools in Examples 1-18 and Comparative Examples 1-7 was the same, and performance index tests were performed on them respectively. The test results are recorded in Table 1 below. The performance test method is as follows: (1) Durable sharpness test method: The durability of sharpness is tested using a simulated tool life test method, the details of which are described below.

[0172] The simulated tool life test method is as follows: The tool to be tested is fixed horizontally with the cutting edge facing down on a tool holder. After adding weights, it is pressed onto a simulated object with a pressure of 16N. The simulated object (using 3mm kraft paper) is kept stationary while being cut. The tool holder is driven by a motor and pneumatic pressure, causing the tool to cut in the X-axis direction at a reciprocating speed of 50mm / s. Simultaneously, it rises in the Z-axis direction and displaces 1mm in the Y-axis direction, shaping the simulated object. The cutting stroke is 100mm. The test ends after every 5 cuts. An evaluation object (ham sausage) is used to determine the tool's durable sharpness. The test ends when the evaluation object cannot be cut. The total number of cuts from the start to the end of the test is recorded as the tool's durable sharpness. The more cuts, the higher the durable sharpness, and vice versa. This project requires the tool's durable sharpness to exceed 1000 cuts.

[0173] (2) Impact resistance test (the impact resistance test can comprehensively evaluate the bonding strength and brittleness of the cladding material): A 500g steel ball is dropped from different heights (in cm, tested once at 10cm intervals) to impact the surface of the coating, and the coating is observed to see if there are any phenomena such as peeling, cracking or denting. The impact resistance performance can reflect whether the coating is prone to chipping after being subjected to external force. The higher the impact resistance test data (the higher the height), the better the impact resistance performance, and vice versa. This project requires the impact resistance test of the tool to be above 100cm.

[0174] (3) Supplementary bonding strength test method: The bonding strength test method in GB / T8642 "Determination of Bond Strength of Thermal Spray Coatings" is adopted, using the "tensile method". The two ends of the "substrate-coating" sample are fixed separately using a special fixture, and an axial tensile load is applied until the sample breaks at the interface between the coating and the substrate, inside the coating, or inside the substrate. The "bonding strength" is calculated based on the maximum load at break and the effective bonding area of ​​the coating. Bonding strength reflects how easily the coating separates from the tool body after being subjected to external force. The higher the bond strength test value, the stronger the bonding force of the layer, and vice versa. This project requires the bonding strength of the tool to be 100 N / mm. 2 above.

[0175] Table 1 Performance test data of embodiments and comparative examples of this application

[0176]

[0177] In summary, based on the impact resistance test data and durable sharpness data of the cutting edge of the knives in various embodiments and comparative examples of this application, it can be seen that the impact resistance test data of the cutting edge of the knife of this application is generally good, all exceeding the required 100cm. Therefore, the cutting edge is not easily chipped and can maintain its sharpness for a long time. Furthermore, the durable sharpness data of this embodiment is also above the required 1000 times in this project, which indirectly demonstrates that the knife of this embodiment is neither prone to chipping nor prone to chipping.

[0178] Comparative Examples 1 and 3 to 7 differ from the corresponding embodiments only in the choice of material shape. The impact resistance test data of these comparative examples cannot meet the requirement of 100cm. Therefore, it can be seen that the overall edge of these comparative examples is prone to chipping. In addition, combined with the durability sharpness data, it does not exceed the requirement of 1000 times. Therefore, it can be seen that the difference in the choice of material shape (replacing the sheet material of the embodiment of this application with granular material) will significantly affect the durability sharpness of the knife.

[0179] It is also necessary to note that although Comparative Example 2 has good impact toughness, which means it is not easy to chip, its durability sharpness data does not meet the requirements. This is because the edge it forms is prone to chipping, which will affect the durability sharpness of the knife.

[0180] Furthermore, from the bonding strength test data of various embodiments and comparative examples of this application, it can be seen that the cutting edge of the tool in the embodiments of this application is not easily delaminated, has good bonding force, and has good durability, which is significantly better than that of the comparative examples.

Claims

1. A method for manufacturing a cutting tool, characterized in that, The manufacturing method includes: A tool body with accommodating grooves on its sidewalls in the thickness direction; A multi-layer structure is formed in the receiving groove; The cutting edge is formed by the multi-layer structure and the tool body together to form the cutting edge of the tool.

2. The method for manufacturing a cutting tool according to claim 1, characterized in that, The multi-layered structure is a multi-layered scale-like structure.

3. The method for manufacturing a cutting tool according to claim 2, characterized in that, The steps of forming a multi-layered flake structure include: forming droplets spaced by a rigid material to form a multi-layered flake structure in the receiving groove.

4. The method for manufacturing a cutting tool according to claim 3, characterized in that, The steps involved in forming droplets using rigid material spacers include: Droplets are formed by using a hard material at a preset time interval, which is 0.05s-0.5s.

5. The method for manufacturing a cutting tool according to claim 3, characterized in that, The steps involved in forming a multi-layered, scaly structure include: The hard material is moved along the length of the tool to form a scale sublayer by causing the scale monomers of adjacent droplet structures to overlap. Multiple scale sub-layers are formed along the width direction of the tool, and adjacent scale sub-layers are connected to form a scale-like layer; Multiple flake-like layers are sequentially stacked along the thickness direction of the tool body to form the multi-layer flake-like structure; or, The steps involved in forming a multi-layered, scaly structure include: The hard material is moved along the length of the tool to form a scale-like layer by causing the scale-like monomers of adjacent molten droplets to overlap. Multiple scale-like layers are stacked sequentially in the thickness direction of the tool body to form the multi-layer scale-like structure.

6. The method for manufacturing a cutting tool according to claim 5, characterized in that, The hard material is in strip shape, and is welded to form molten droplets. The welding power is 2kW-20kW. The outer radius of the hard material is 0.3mm-1.5mm, and the inner radius is no greater than 0.5mm, so as to control the surface area of ​​the individual flakes to be 10mm². 2 -100mm 2 The thickness of the scale monomer is 100μm-500μm.

7. The method for manufacturing a cutting tool according to claim 5, characterized in that, The step of moving the hard material along the length of the tool includes: The moving speed of the rigid material is controlled to be 0.1 cm / s-1 cm / s, so that the overlapping area of ​​adjacent scale units in the length direction is 10%-80% of the area of ​​a single scale unit.

8. The method for manufacturing a cutting tool according to claim 2, characterized in that, The steps involved in forming a multi-layered, scaly structure include: Spraying a hard, scaly material causes the surface of the scaly material to melt slightly while the interior remains unmelted, thereby forming a multi-layered scaly structure in a receiving groove by sequentially stacking individual scaly materials.

9. The method for manufacturing a cutting tool according to claim 8, characterized in that, The spraying distance is 5cm-30cm, and the gas pressure is 0.1bar-0.5bar; The main surface area of ​​the flaky material is 10 mm². 2 -100mm 2 The thickness is 100μm-500μm, thereby enabling control over the surface area of ​​the flake monomer to be 10mm. 2 -100mm 2 And the thickness is 100μm-500μm.

10. A method for manufacturing a cutting tool according to any one of claims 1 to 9, characterized in that, The hardness difference between the multi-layer structure and the tool body is 50HV-200HV.

11. A method for manufacturing a cutting tool according to any one of claims 3 to 9, characterized in that, The hard material includes at least one of titanium, titanium alloy, martensitic stainless steel, molybdenum series alloys, tool steel alloys, nickel-based alloys, and cobalt-based alloys; and / or, the material forming the tool body includes at least one of carbon steel, 3Cr13 stainless steel, 4Cr13 stainless steel, 5Cr15MoV stainless steel, 7Cr13MoV stainless steel, 8Cr13MoV stainless steel, and 9Cr18MoV stainless steel.

12. The method for manufacturing a cutting tool according to any one of claims 3 to 9, characterized in that, The rigid material is a composite wire in which sheet-like ceramic material is dispersed in metal wire.

13. The method for manufacturing a cutting tool according to any one of claims 1 to 9, characterized in that, The centerline of the cutting tool in the thickness direction is S2, the bottom of the receiving groove coincides with S2 or the inclination angle relative to S2 is not greater than 10°, the multi-layer structure is arranged sequentially along the groove bottom to the groove opening; and / or, the inner wall of the receiving groove is a continuous concave arc surface or a surface with abrupt angle.

14. A cutting tool, characterized in that, The cutting tool is manufactured by the cutting tool manufacturing method according to any one of claims 1 to 13.

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