Cutter

Abstract

The utility model provides a cutter. The cutter comprises a cutter body and a hard layer, wherein the hard layer is formed at the lower end part of the cutter body in the height direction and is used as a cutting edge part of the cutter; wherein a cutting edge of the cutting edge part is provided with a concave-convex structure extending in the length direction, and the surface of the concave-convex structure is provided with a plurality of micro protrusions. According to the cutter disclosed by the utility model, the cutting edge part of the cutter is formed by the hard layer, the cutting edge of the cutting edge part is provided with the concave-convex structure along the length direction of the cutter, and the surface of the concave-convex structure is provided with the plurality of micro bulges, so that the cutter can obtain good sharpness due to the cutting edge of the hard layer with certain hardness; compared with a cutter cutting edge with a micro sawtooth structure, the cutting edge is further provided with a multi-stage tooth-shaped structure, under the assistance of the concave-convex structure, the micro protrusions can cut food materials more easily, and therefore the lasting sharpness performance of the cutter can be further improved.

Description

Technical Field

[0001] This utility model relates to the field of kitchen utensils technology, specifically to a knife. Background Technology

[0002] In existing technology, kitchen knives are typically made of stainless steel or high-carbon steel. During the manufacturing process, a cutting edge with a specific sheath angle is usually formed at one end of the knife. To achieve better sharpness, the sheath angle is generally minimized. While a smaller sheath angle is beneficial for cutting food, it also reduces durability and leads to blade dulling, resulting in a decrease in sustained sharpness. Current knives have relatively low sustained sharpness, failing to meet people's performance requirements. Therefore, developing new knives to meet the demand for sustained sharpness is of paramount importance. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a cutting tool to solve the problem of the generally poor long-term sharpness of cutting tools.

[0004] According to the present invention, a cutting tool is provided, wherein the cutting tool includes a cutting tool body and a hardened layer; wherein the hardened layer is formed at the lower end of the cutting tool body in the height direction, serving as the cutting edge of the cutting tool; wherein the cutting edge of the cutting edge has a concave-convex structure extending in the length direction, and the surface of the concave-convex structure has a plurality of micro-protrusions.

[0005] According to the present invention, the cutting edge of the knife is formed with a hard layer, and the cutting edge has a concave-convex structure along the length of the knife, with multiple micro-protrusions on the surface of the concave-convex structure. In other words, the cutting edge of the knife of the present invention is constructed of a hard layer, and the cutting edge has a multi-level toothed structure. Thus, the knife can obtain good sharpness due to the hard layer with a certain degree of hardness. Compared with the cutting edge of a knife with a micro-serrated structure, the cutting edge of the present invention also has a multi-level toothed structure. With the assistance of the concave-convex structure, the micro-protrusions are easier to cut into food, thereby further improving the knife's long-lasting sharpness.

[0006] In some embodiments, the lower end face of the lower end in the height direction of the tool body is curved, and the hard layer is bonded to the curved surface. The curved surface has a larger bonding surface, which can further enhance the bonding force between the hard layer and the lower end in the height direction of the tool body, and prevent the two from falling off at the bonding point, thereby improving the long-lasting sharpness from this perspective.

[0007] In some embodiments, the convex-concave structure includes a plurality of convex buds and a groove located between adjacent convex buds, the micro-protrusions being formed on the surface of the convex buds and / or the grooves.

[0008] In these embodiments, the micro-protrusions on the raised positions are more prominent, making it easier to cut into food. The concave-convex structure can withstand the impact force during cutting, at least protecting the micro-protrusions in the grooves and reducing their deformation due to uneven stress, thus ensuring the long-term sharpness of the knife during use. Furthermore, even if the micro-protrusions on the raised positions wear or become dull due to prolonged use, the micro-protrusions in the grooves can still remain sharp. In other words, even after the micro-protrusions on the raised positions wear down, the knife can still use the portion of the micro-protrusions in the grooves for cutting, thereby improving the knife's long-term sharpness.

[0009] In some embodiments, the width W1 of the convex hull is 50 micrometers to 300 micrometers; and / or, the width W2 of the groove is 50 micrometers to 300 micrometers, and the depth H2 of the groove is 25 micrometers to 150 micrometers; and / or, the width of the micro-protrusion is 10 micrometers to 50 micrometers, and the spacing between the micro-protrusions is less than or equal to 50 micrometers; and / or, the height H1 of the convex hull is 25 micrometers to 150 micrometers, and the height of the micro-protrusion is 5 micrometers to 25 micrometers.

[0010] In these embodiments, the shaped bumps, grooves, and micro-protrusions of specific dimensions ensure the tool's sustained sharpness and maintain stable cutting performance during the cutting process, while extending the tool's service life.

[0011] In some embodiments, the hard layer is an alloy particle layer, which includes alloy particles with a first particle size R1 and alloy particles with a second particle size R2, wherein R1 is greater than R2, 25 micrometers ≤ R1 < 150 micrometers, and 5 micrometers ≤ R2 ≤ 25 micrometers.

[0012] In these embodiments, by using alloy particles of different sizes to form an alloy particle layer as a hard layer, the surface and internal structure of the hard layer can continuously form a cutting edge with a multi-level tooth structure after subsequent grinding, thereby ensuring the long-lasting sharpness of the tool during later use.

[0013] In some embodiments, the alloy particle layer includes one of a stainless steel particle layer, a tool steel alloy particle layer, a titanium alloy particle layer, a chromium alloy particle layer, a nickel alloy particle layer, and a cobalt alloy particle layer.

[0014] In these embodiments, the alloy particle layer possesses good hardness and wear resistance, ensuring the hardness and wear resistance of the hardened layer, thereby achieving a durable and sharp cutting edge. Furthermore, the alloy particle layer also possesses a certain degree of toughness, ensuring the bonding force between the hardened layer and the tool body, thus preventing the hardened layer from easily detaching during use and avoiding chipping, thereby guaranteeing a long-lasting sharpness of the tool.

[0015] In some embodiments, the hard layer is formed by one of the following methods: arc spraying, flame spraying, plasma spraying, high-speed oxy-fuel spraying, cold spraying, laser cladding, plasma cladding, and electron beam melting. These spraying methods enable the surface of alloy particles to be micro-melted, forming a layer with a rough surface structure. This allows for the combination of alloy particles of different sizes (multi-sized alloy particles) to form a hard layer, paving the way for a cutting edge with a multi-level tooth structure, which is beneficial for improving the sharpness of the tool.

[0016] In some embodiments, the particle size difference between the alloy particles of the first particle size R1 and the alloy particles of the second particle size R2 is greater than or equal to 20 micrometers; and / or, the ratio of the number of alloy particles of the first particle size R1 to the number of alloy particles of the second particle size R2 is 1:(5-50). Such a particle size difference and number ratio can refine the cutting edge of the formed tool, making the concave and convex shape of the cutting edge more dense, and making it more conducive to forming a cutting edge with a multi-stage tooth structure according to the present invention, thereby improving the sharpness of the tool.

[0017] In some embodiments, alloy particles of the first particle size R1 and alloy particles of the second particle size R2 are distributed alternately; or, alloy particles of the second particle size R2 are formed on the surface of an uneven structure layer constructed from alloy particles of the first particle size R1. Both of these structural forms can be used to construct an uneven structure extending along the length direction, and the surface of the uneven structure has multiple micro-protrusions on the cutting edge, thereby obtaining a tool with a durable sharpness.

[0018] In some embodiments, the alloy particle layer further contains dispersed hard particles, the hardness of which is greater than that of the individual alloy particles. In other words, the hard layer is a composite layer of alloy particles and hard particles with a higher hardness than the alloy particles. Thus, the hard particles in the hard layer, due to their greater hardness, increase the strength of the cutting edge, making it less prone to chipping and wear, thereby achieving a tool with further enhanced and lasting sharpness.

[0019] In some embodiments, the particle size of the hard particles is R3, where 10 micrometers ≤ R3 ≤ 50 micrometers, and R1 ≤ R3 ≤ R2. If the particle size of the hard particles is too large, it will make cutting uneven and affect the cutting experience; if the particle size of the hard particles is too small, the improvement in sharpness will not be significant. Hard particles of appropriate size, as part of the hard layer, can improve the sharpness of the tool while ensuring a good cutting experience.

[0020] In some embodiments, hard particles are embedded on alloy particles of the first particle size R1, so that the hard particles in the hard layer and the alloy particles of the second particle size can have good bonding. Thus, when the hard particles are part of the micro-protrusions forming the cutting edge, they are not easy to fall off due to their strong bonding force, thereby maintaining their sharpness for a long time.

[0021] In some embodiments, the hard particles include one of titanium carbide particles, titanium nitride particles, titanium carbonitride particles, titanium aluminum nitride particles, tungsten carbide particles, tungsten discarbide particles, alumina particles, zirconium dioxide particles, silicon carbide particles, boron carbide particles, tantalum carbide particles, niobium carbide particles, silicon nitride particles, cubic boron nitride particles, aluminum nitride particles, titanium diboride particles, and zirconium diboride particles. In these embodiments, the hard particles used for the cutting tool possess suitable hardness and wear resistance, enabling the formed cutting edge of the tool to be more wear-resistant, thereby improving the durability of the multi-stage toothed cutting edge during use and avoiding the inconvenience of frequent sharpening.

[0022] In some embodiments, the average thickness of the hardened layer is 1 micrometer to 10 micrometers. When the hardened layer is too thin, the cutting edge will wear or be damaged rapidly during cutting or use. When the hardened layer is too thick, although the hardness may be further increased, it may also lead to increased brittleness of the cutting edge, reducing its impact resistance and toughness. Thus, a hardened layer of appropriate thickness can ensure that the area near the cutting edge has suitable strength and hardness, thereby enhancing the wear resistance and impact resistance of the cutting edge. Attached Figure Description

[0023] The above and other objects and features of this utility model will become clearer from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 This is a right-side structural schematic diagram of a cutting tool according to an embodiment of the present utility model;

[0025] Figure 2 This is a left-side view of a cutting tool according to an embodiment of the present utility model;

[0026] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure in the diagram;

[0027] Figure 4 yes Figure 1 Enlarged structural diagram at point J;

[0028] Figure 5 This is a right-side view of another cutting tool according to an embodiment of the present utility model;

[0029] Figure 6This is a left-side view of another cutting tool according to an embodiment of the present utility model;

[0030] Figure 7 yes Figure 5 A schematic diagram of the cross-sectional structure in the diagram;

[0031] Figure 8 yes Figure 5 A magnified structural diagram at point K.

[0032] Tag name

[0033] 10. Tool body; 11. First surface; 12. Second surface; 13. Lower end; 20. Hard layer; 21. Alloy particles with a first particle size R1; 22. Alloy particles with a second particle size R2; 30. Concave-convex structure; 31. Protrusion; 32. Groove; 40. Micro-protrusion; 50. Cutting edge; 51. Cutting edge; 60. Hard coating layer; 70. Back of the tool. Detailed Implementation

[0034] The following detailed descriptions are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be altered as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0035] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatus and / or systems described herein, many of which will become clear upon understanding the disclosure of this utility model.

[0036] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0037] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0038] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "mounted to" another element, the element may be directly "on" another element, directly "connected to," or "mounted to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly mounted to" another element, no other elements may be present in between.

[0039] The terminology used herein is for describing various examples only and is not intended to limit the invention. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0040] The directional terms "upper," "lower," "inner," and "outer" used in this utility model are all based on the reference position of the tool when it is in normal use. This definition method will help ensure that the reader or user can clearly understand the relative positional relationship of the various components and functions, and should not be construed as a limitation of this utility model.

[0041] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains after understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0042] Furthermore, in the description of the examples, detailed descriptions of well-known related components or functions will be omitted when it is believed that such detailed descriptions would lead to a vague interpretation of the present invention.

[0043] The following will combine Figures 1 to 8 The present invention will now be described in the form of a cutting tool provided in an embodiment of this utility model.

[0044] A cutting tool is provided according to an embodiment of this utility model. Wherein, as... Figures 1 to 8 As shown, the cutting tool includes a tool body 10 and a hard layer 20. The hard layer 20 is formed at the lower end 13 of the tool body 10 in the height direction, serving as the cutting edge 50 of the tool. The cutting edge 51 of the cutting edge 50 has a concave-convex structure 30 extending in the length direction, and the surface of the concave-convex structure 30 has a plurality of micro-protrusions 40.

[0045] According to the present invention, the cutting edge 50 of the knife is formed by a hard layer 20, and the cutting edge 51 of the cutting edge 50 is provided with a concave-convex structure 30 along the length direction of the knife, and the surface of the concave-convex structure 30 has a plurality of micro-protrusions 40. In other words, the cutting edge 50 of the knife of the present invention is constructed of a hard layer 20, and the cutting edge 51 has a multi-level tooth structure. Thus, the knife can obtain good sharpness due to the hard layer 20 having a certain degree of hardness. Compared with the cutting edge of a knife with a micro-serrated structure, the cutting edge 51 of the present invention also has a multi-level tooth structure. With the assistance of the concave-convex structure 30, the micro-protrusions 40 are easier to cut into food, thereby further improving the knife's long-lasting sharpness.

[0046] In some embodiments, the lower end face of the lower end portion 13 in the height direction of the tool body 10 is curved, and the hard layer 20 is bonded to the curved surface. The curved surface has a larger bonding surface, which can further enhance the bonding force between the hard layer 20 and the lower end portion 13 in the height direction of the tool body 10, preventing them from falling off at the bonding point, thereby improving the durable sharpness from this perspective. As a specific example, the curved surface can be a convex arc surface or a concave arc surface.

[0047] In this utility model, such as Figure 1 and Figure 4 As shown, the cutting tool includes a cutting edge 50 and a back 70. The cutting edge 50 is the main functional area for cutting, while the back 70 provides support and stability. The cutting edge 50 and the back 70 are respectively located on opposite sides of the tool's height. The cutting edge 51 is the tip of the cutting edge 50 (the outer edge of the cutting edge 50), also known as the cutting tip. In this invention, the cutting edge 51 has a concave-convex structure 30 extending along the length of the tool, and the surface of the concave-convex structure 30 has multiple micro-protrusions 40. These micro-protrusions 40 are formed on the surface of the concave-convex structure 30, effectively forming multiple micro-serrations on the cutting edge with the concave-convex structure 30. Here, the size, shape, and distribution density of the micro-protrusions 40 can be adjusted according to different tool types.

[0048] In this invention, the cutting edge 51 of the knife includes a concave-convex structure 30 and multiple micro-protrusions 40 (secondary concave-convex contours) formed on the concave-convex structure 30 (primary concave-convex contour). In other words, the cutting edge 51 of this invention has a multi-level toothed structure. When cutting, this knife exerts greater pressure than conventional knives under the same applied force, thus cutting into food more easily, maintaining its sharpness for longer, and improving cutting efficiency.

[0049] Specifically, the concave-convex structure 30 includes a plurality of protrusions 31 and grooves 32 located between adjacent protrusions 31. Micro-protrusions 40 are formed on the surface of the protrusions 31 and / or grooves 32. The protrusions 31 and grooves 32 may be distributed uniformly or unevenly, and the present invention does not impose too many limitations on this.

[0050] In these embodiments, the micro-protrusions 40 located at the protrusion 31 are more prominent, making it easier to cut into food. The concave-convex structure 30 can withstand the impact force during cutting, at least protecting the micro-protrusions 40 located in the groove 32 and reducing their deformation due to uneven force, thus ensuring the long-term sharpness of the knife during use. Furthermore, even if the micro-protrusions 40 at the protrusion location wear or become dull due to prolonged use, the micro-protrusions 40 located in the groove can still remain sharp. In other words, even after the micro-protrusions 40 at the protrusion location wear down, the knife can still use the portion of the micro-protrusions 40 located in the groove 32 for cutting, thereby improving the long-term sharpness of the knife.

[0051] In some embodiments, the width W1 of the convex hull 31 is 50 micrometers to 300 micrometers, the height H1 of the convex hull 31 is 25 micrometers to 150 micrometers, the width W2 of the groove 32 is 50 micrometers to 300 micrometers, the depth H2 of the groove 32 is 25 micrometers to 150 micrometers, the width of the micro-protrusion 40 is 10 micrometers to 50 micrometers, the height is 5 micrometers to 25 micrometers, and the spacing between the micro-protrusions 40 is less than or equal to 50 micrometers.

[0052] In these embodiments, the convex 31, groove 32 and micro protrusion 40 of specific dimensions can ensure the long-term sharpness of the tool and enable the tool to maintain stable cutting performance during the cutting process, while extending the tool's service life.

[0053] In some embodiments, the knife can be a kitchen knife, specifically a Chinese kitchen knife, a Western kitchen knife, or a Japanese kitchen knife. Chinese kitchen knives include slicing knives, cleavers, or dual-purpose knives; Western kitchen knives include chef's knives, santoku knives, boning knives, or bread knives; and Japanese kitchen knives include yanagiba knives, deba knives, or takoyaki knives. Furthermore, it should be noted that this invention does not limit the knife to a kitchen knife; those skilled in the art can apply the teachings of this invention to other types of knives, such as industrial knives or surgical knives.

[0054] In this invention, the cutting edge 50 of the tool is constructed by a hard layer 20. At the same time, the distribution pattern of the hard layer 20 can be used to obtain a tool with a multi-level tooth structure.

[0055] According to this utility model, the cutting tool includes a tool body 10 and a hard layer 20 formed on the lower end 13 of the tool body 10 in the height direction. The hardness of the hard layer 20 is greater than the hardness of the tool body 10. The lower end of the hard layer 20 forms a concave-convex structure for the cutting edge 51 of the tool and micro-protrusions 40 located on the concave-convex structure. As a specific example, the Vickers hardness of the tool body 10 is 200HV-700HV, and the Vickers hardness of the hard layer 20 is 500HV-2500HV. Thus, by specifying the hardness of the tool body 10 and the hard layer 20, a cutting edge portion of the tool with suitable hardness can be constructed, thereby further improving the tool's long-lasting sharpness. In a preferred embodiment, the Vickers hardness difference between the tool body 10 and the hard layer 20 is greater than or equal to 20HV. By setting a suitable hardness difference between the tool body 10 and the hard layer 20, a cutting edge portion of the tool with suitable hardness can be constructed, thereby further improving the tool's long-lasting sharpness.

[0056] In these embodiments, the hard layer 20 forms the uneven structure 30 and micro-protrusions 40 of the cutting edge 51 of the tool. Thus, the hardness of the hard layer 20 ensures the cutting sharpness and wear resistance of the tool. Furthermore, the material cost of the hard layer 20 is typically higher than that of the tool body 10. By applying the hard material only to the cutting edge 50, the manufacturing cost of the tool can be reduced while maintaining its sharpness.

[0057] In some embodiments, the hard layer 20 is an alloy particle layer. Specifically, the hard layer 20 is formed by spraying and polishing alloy particles of different sizes. The particles of different sizes can be close to each other, or even stacked, or they can be spaced apart, but the maximum distance does not exceed 200 micrometers, thereby forming the hard layer 20 through stacking.

[0058] As a specific example, the alloy particle layer includes alloy particles 21 with a first particle size R1 and alloy particles 22 with a second particle size R2, wherein R1 is greater than R2, 25 micrometers ≤ R1 < 150 micrometers, and 5 micrometers ≤ R2 ≤ 25 micrometers. Spraying the alloy particles 21 with the first particle size R1 and the alloy particles 22 with the second particle size R2 can form the desired hard layer 20. It can be understood that the particle size forming the hard layer 20 is an aggregate of large and small particle sizes. Here, the particle size is the particle size represented by D50 (median particle size).

[0059] More specifically, the alloy particle layer includes one of stainless steel particle layer, tool steel alloy particle layer, titanium alloy particle layer, chromium alloy particle layer, nickel alloy particle layer and cobalt alloy particle layer.

[0060] In a preferred embodiment, the alloy particles 21 with a first particle size R1 and the alloy particles 22 with a second particle size R2 have a suitable particle size difference and quantity distribution. For example, the particle size difference between the alloy particles 21 with the first particle size R1 and the alloy particles 22 with the second particle size R2 is greater than or equal to 20 micrometers, and the ratio of the number of alloy particles 21 with the first particle size R1 to the number of alloy particles 22 with the second particle size R2 can be 1:(5-50). Such a particle size difference and quantity ratio can refine the cutting edge of the formed tool, making the concave and convex shape of the cutting edge 51 of the tool more dense, and more conducive to forming the multi-level toothed structure of the cutting edge 51 according to this invention, thereby improving the sharpness of the tool.

[0061] In these embodiments, by using alloy particles of different sizes to form an alloy particle layer as a hard layer 20, the surface and internal structure of the hard layer 20 can continuously form a cutting edge 51 with a multi-level tooth structure after subsequent grinding, thereby ensuring the long-lasting sharpness of the cutting tool during later use.

[0062] In some embodiments, the hard layer 20 is a sprayed layer formed using alloy particles through existing processes. Existing processes include one of the following: arc spraying, flame spraying, plasma spraying, high-velocity oxy-fuel spraying, cold spraying, laser cladding, plasma cladding, and electron beam melting. These spraying methods enable the alloy particles to undergo micro-melting, forming a layer with a rough surface structure. This allows for the combination of alloy particles 22 of different sizes (multi-sized alloy particles) to obtain the hard layer 20, paving the way for a cutting edge 51 with a multi-level tooth structure, which is beneficial for improving the sharpness of the tool.

[0063] In some embodiments, the alloy particles 21 with a first particle size R1 and the alloy particles 22 with a second particle size R2 are of the same alloy type. Correspondingly, the hard layer is a stacked layer of the same type of material formed by particles of different sizes. The alloy particles are existing materials, including stainless steel particles, tool steel alloy particles, titanium alloy particles, chromium alloy particles, nickel alloy particles, and cobalt alloy particles. As a specific example, tool steel alloy particles are alloy particles based on iron (Fe) with added alloying elements such as carbon (C), tungsten (W), molybdenum (Mo), and vanadium (V), which also belong to existing materials.

[0064] In these embodiments, the alloy particles possess good hardness and wear resistance, ensuring the hardness and wear resistance of the hardened layer, thereby obtaining a durable and sharp cutting edge 51. Furthermore, the alloy particles also possess a certain degree of toughness, ensuring the bonding force between the hardened layer 20 and the tool body 10, thus preventing the hardened layer 20 from easily detaching during use and avoiding chipping, thereby ensuring a long-lasting sharpness of the tool.

[0065] Continuing with the above examples, the hard layer 20 specifically includes: arc-sprayed stainless steel layer, flame-sprayed stainless steel layer, plasma-sprayed stainless steel layer, high-velocity oxygen fuel-sprayed stainless steel layer, cold-sprayed stainless steel layer, laser-clad stainless steel layer, plasma-clad stainless steel layer, electron beam melting stainless steel layer, arc-sprayed nickel-molybdenum alloy layer, flame-sprayed nickel-molybdenum alloy layer, plasma-sprayed nickel-molybdenum alloy layer, high-velocity oxygen fuel-sprayed nickel-molybdenum alloy layer, cold-sprayed nickel-molybdenum alloy layer, laser-clad nickel-molybdenum alloy layer, plasma-clad nickel-molybdenum alloy layer, electron beam melting nickel-molybdenum alloy layer, arc-sprayed tool steel alloy layer, flame-sprayed tool steel alloy layer, plasma-sprayed tool steel alloy layer, high-velocity oxygen fuel-sprayed tool steel alloy layer, cold-sprayed tool steel alloy layer, laser-clad tool steel alloy layer, and plasma-clad tool steel alloy layer. The first of the following: electron beam molten tool steel alloy layer, arc sprayed titanium alloy layer, flame sprayed titanium alloy layer, plasma sprayed titanium alloy layer, high-velocity oxygen fuel sprayed titanium alloy layer, cold sprayed titanium alloy layer, laser cladding titanium alloy layer, plasma cladding titanium alloy layer, electron beam molten titanium alloy layer, arc sprayed nickel-based alloy layer, flame sprayed nickel-based alloy layer, plasma sprayed nickel-based alloy layer, high-velocity oxygen fuel sprayed nickel-based alloy layer, cold sprayed nickel-based alloy layer, laser cladding nickel-based alloy layer, plasma cladding nickel-based alloy layer, electron beam molten nickel-based alloy layer, arc sprayed cobalt-based alloy layer, flame sprayed cobalt-based alloy layer, plasma sprayed cobalt-based alloy layer, high-velocity oxygen fuel sprayed cobalt-based alloy layer, cold sprayed cobalt-based alloy layer, laser cladding cobalt-based alloy layer, plasma cladding cobalt-based alloy layer, and electron beam molten cobalt-based alloy layer.

[0066] In some embodiments, alloy particles 21 of the first particle size R1 and alloy particles 22 of the second particle size R2 are distributed alternately; or, alloy particles 22 of the second particle size R2 are formed on the surface of the uneven structure layer constructed by the alloy particles 21 of the first particle size R1. Both of the above structural forms can construct a structure with an uneven structure extending along the length direction, and a plurality of micro-protrusions 51 on the surface of the uneven structure, thereby obtaining a tool with lasting sharpness. During use and sharpening, the alloy particles 21 of the first particle size R1 in the hard layer 20 of this invention can be used to construct the uneven structure 30 at the cutting edge 51, and the alloy particles 22 of the second particle size R2 can be used to construct the micro-protrusions 40 on the uneven structure 30.

[0067] In some embodiments, the thickness of the hard layer 20 is 1 micrometer to 10 micrometers. When the hard layer is too thin, the cutting edge will wear or be damaged rapidly during cutting or use. When the hard layer is too thick, although the hardness may be further increased, it may also lead to increased brittleness of the cutting edge, reducing its impact resistance and toughness. Thus, a hard layer 20 of appropriate thickness can ensure that the region of the cutting edge 50 near the cutting edge 51 has appropriate strength and hardness, thereby enhancing the wear resistance and impact resistance of the cutting edge 50.

[0068] In some embodiments, the alloy particle layer also contains dispersed hard particles, the hardness of which is greater than that of the individual alloy particles. In other words, the hard layer 20 is a composite layer of alloy particles and hard particles with a higher hardness than the alloy particles. Thus, the hard particles in the hard layer 20 can increase the strength of the cutting edge due to their greater hardness, making it less prone to chipping and wear, thereby obtaining a tool with further improved durability and sharpness.

[0069] More specifically, a portion of the alloy particles 22 with a second particle size R2 and a portion of the hard particles are dispersed on the surface of the hard layer 20 to form micro-protrusions 40. In this way, the tool has suitable hardness in the initial stage of use, thereby achieving good sharpness. In some embodiments, the hard particles are also dispersed inside the hard layer 20. During subsequent sharpening of the tool, the hard particles may be exposed and serve as micro-protrusions 40 after sharpening, thereby ensuring the tool's long-lasting sharpness.

[0070] In some embodiments, the particle size of the hard particles is R3, where R1≤R3≤R2, and 10 micrometers≤R3≤50 micrometers. If the particle size of the hard particles is too large, it will make cutting uneven and affect the cutting experience; if the particle size of the hard particles is too small, the improvement in sharpness will not be significant. Hard particles of appropriate size, as part of the hard layer 20, can improve the sharpness of the tool while ensuring the cutting experience.

[0071] In some embodiments, hard particles are embedded on alloy particles 21 with a first particle size R1, so that the hard particles in the hard layer 20 and the alloy particles 22 with a second particle size R2 can have good bonding. Thus, when the hard particles are part of the micro-protrusions 40 forming the cutting edge 51, they are not easy to fall off due to their strong bonding force, thereby maintaining their sharpness.

[0072] In some embodiments, the hard particles are existing materials and can be non-metallic ceramic particles. Specifically, the non-metallic ceramic particles include one of the following: titanium carbide (TiC) particles, titanium nitride (TiN) particles, titanium carbonitride (TiCN) particles, titanium aluminum nitride (TiAlN) particles, tungsten carbide (WC) particles, tungsten discarbide (W2C) particles, alumina (Al2O3) particles, zirconium dioxide (ZrO2) particles, silicon carbide (SiC) particles, boron carbide (B4C) particles, tantalum carbide (TaC) particles, niobium carbide (NbC) particles, silicon nitride (Si3N4) particles, cubic boron nitride (cBN) particles, aluminum nitride (AlN) particles, titanium diboride (TiB2) particles, and zirconium diboride (ZrB2) particles.

[0073] In these embodiments, the hard particles used for the cutting tool have suitable hardness and wear resistance, which makes the cutting edge of the formed tool more wear-resistant, thereby improving the durability of the cutting edge of the multi-stage tooth structure during use and avoiding the trouble of frequent sharpening.

[0074] like Figures 1 to 4 As shown, the cutting tool includes a tool body 10 and a hard layer 20. The hard layer 20 is a mixed structure of large and small particles (such as large particles forming a skeleton and small particles filling the gaps between large particles), formed at the lower end 13 of the tool body 10 in the height direction, serving as the cutting edge 51 of the tool. The lower end of the hard layer 20 is arranged with concave and convex shapes, so that the cutting edge 51 of the tool has a concave-convex structure 30 composed of multiple protrusions 31 along the length direction, and the surface of each protrusion 31 of the concave-convex structure 30 has multiple micro-protrusions 40.

[0075] like Figures 5 to 8 As shown, the cutting tool includes a tool body 10 and a hard layer 20. The hard layer 20 has a structure of sequentially stacked particles of different sizes. The hard layer 20 is formed at the lower end 13 of the tool body 10 in the height direction, serving as the cutting edge 51 of the tool. The lower end of the hard layer 20 is arranged with concave and convex shapes, so that the cutting edge 51 of the tool has a concave-convex structure 30 composed of multiple protrusions 31 along its length direction, and the surface of each protrusion 31 of the concave-convex structure 30 has multiple micro-protrusions 40.

[0076] Both of these specific structural forms enable the cutting edge 51 of the tool to have a multi-stage tooth structure, thereby ensuring the tool's long-lasting sharpness.

[0077] In this invention, to clearly define the formation location of the hard layer 20, a portion of the hard layer 20 is marked as a black area. It should be noted that this invention does not limit the color of the hard layer 20 to include black; its color depends on the actual material selected. For example, the hard layer can also be a conventional metallic color, identical to the color of the tool body 10.

[0078] In an embodiment of this utility model, a method for manufacturing a cutting tool is provided. The method includes: providing a cutting tool body 10 with a curved lower end 13; then spraying a hard layer 20 onto the lower end 13 of the cutting tool body using a hard material; subsequently grinding the hard layer and using the remaining hard layer as the cutting edge of the tool. The hard material includes a mixture of alloy particles 21 with a first particle size R1 and alloy particles 22 with a second particle size R2, or a mixture of alloy particles 21 with a first particle size R1, alloy particles 22 with a second particle size R2, and hard particles. Here, R1≤R3≤R2, so that particles of different sizes can be sprayed to form a hard layer 20 that easily constructs the concave-convex structure 30 of the cutting edge 51.

[0079] Furthermore, it should be noted that this utility model does not limit the manufacturing method of the tool. It is understood that those skilled in the art can also use methods known to them to form the tool according to this utility model. For example, as another method of manufacturing the tool, an uneven structure layer can be formed by spraying alloy particles 21 with a first particle size R1, and then a finer particle layer can be formed by spraying alloy particles 22 or hard particles with a second particle size R2 on the uneven structure layer. The hard layer with a layered structure obtained in this way can be used to construct the cutting edge 51 of the tool with a multi-level tooth structure of this utility model through the structure of the hard layer (surface structure and internal structure) and with the help of a certain grinding process.

[0080] Furthermore, it should be noted that in some embodiments of this utility model, the concave-convex structure layer can also be machined on the tool substrate using methods such as laser engraving, mechanical stamping, or chemical etching to form a primary concave-convex contour 30. Alternatively, it can be formed by spraying large-sized particles to create the primary concave-convex contour (concave-convex structure 30) according to this utility model. Then, multiple micro-protrusions are machined on the surface of each convex bump of the primary concave-convex contour by spraying, thereby forming a cutting tool with a multi-level toothed structure according to this utility model.

[0081] According to this utility model, the knife also includes a handle, which is connected to one side of the knife body 10 along its length, making it convenient for the user to hold the knife during use.

[0082] While the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope thereof. However, it should be understood that, in the view of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A cutting tool, characterized by The cutting tool includes: Tool body (10); A hard layer (20) is formed at the lower end (13) of the tool body (10) in the height direction, serving as the cutting edge (50) of the tool. The cutting edge (51) of the cutting edge portion (50) has a concave-convex structure (30) extending along the length direction, and the surface of the concave-convex structure (30) has a plurality of micro protrusions (40).

2. The knife of claim 1, wherein, The lower end face of the lower end (13) of the tool body (10) in the height direction is a curved surface, and the hard layer (20) is combined with the curved surface.

3. The knife of claim 1, wherein, The concave-convex structure (30) includes a plurality of protrusions (31) and grooves (32) located between adjacent protrusions (31), and the micro-protrusions (40) are formed on the surface of the protrusions (31) and / or the grooves (32).

4. The tool according to claim 3, characterized in that The width W1 of the convex hull (31) is 50 micrometers to 300 micrometers; and / or, The width W2 of the groove (32) is 50 micrometers to 300 micrometers, and the depth H2 of the groove (32) is 25 micrometers to 150 micrometers; And / or, the width of the micro-protrusions (40) is 10 micrometers to 50 micrometers, and the spacing between the micro-protrusions (40) is less than or equal to 50 micrometers; and / or, The height H1 of the convex hull (31) is 25 micrometers to 150 micrometers, and the height of the micro protrusion (40) is 5 micrometers to 25 micrometers.

5. The knife of claim 1, wherein, The hard layer (20) is an alloy particle layer, which includes alloy particles (21) with a first particle size R1 and alloy particles (22) with a second particle size R2, wherein 25 micrometers ≤ R1 < 150 micrometers, 5 micrometers ≤ R2 ≤ 25 micrometers, and R1 is greater than R2.

6. The tool of claim 5 wherein, The particle size difference between the alloy particles (21) with the first particle size R1 and the alloy particles (22) with the second particle size R2 is greater than or equal to 20 micrometers; and / or, The ratio of the number of alloy particles (21) with the first particle size R1 to the number of alloy particles (22) with the second particle size R2 can be 1:(5-50).

7. The knife of claim 5, wherein, Alloy particles (21) of the first particle size R1 and alloy particles (22) of the second particle size R2 are distributed alternately; or The alloy particles (22) of the second particle size R2 are formed on the surface of the uneven structure layer constructed by the alloy particles (21) of the first particle size R1.

8. The knife of claim 5, wherein, The alloy particle layer also contains dispersed hard particles, the hardness of which is greater than that of each alloy particle.

9. The tool of claim 8 wherein, The hard particles have a particle size of R3, wherein 10 micrometers ≤ R3 ≤ 50 micrometers, and R1 ≤ R3 ≤ R2; and / or, the hard particles are embedded on alloy particles (21) with the first particle size R1; and / or, the hard particles include one of titanium carbide particles, titanium nitride particles, titanium carbonitride particles, titanium aluminum nitride particles, tungsten carbide particles, tungsten dicarbide particles, alumina particles, zirconium dioxide particles, silicon carbide particles, boron carbide particles, tantalum carbide particles, niobium carbide particles, silicon nitride particles, cubic boron nitride particles, aluminum nitride particles, titanium diboride particles, and zirconium diboride particles; and / or, the alloy particle layer includes one of stainless steel particle layer, tool steel alloy particle layer, titanium alloy particle layer, chromium alloy particle layer, nickel alloy particle layer, and cobalt alloy particle layer.

10. The knife of claim 1, wherein, The hard layer (20) has an average thickness of 1 micrometer to 10 micrometers; and / or the hard layer (20) is formed by one of the following methods: arc spraying, flame spraying, plasma spraying, high-speed oxygen fuel spraying, cold spraying, laser cladding, plasma cladding and electron beam melting.

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