Knife and method for manufacturing knife

Abstract

The present application provides a tool and a method for manufacturing the tool. The surface of the cutting edge of the tool along the length direction is provided with a hard layer and a tough layer that are alternately distributed, wherein the hard layer is formed by a metal-ceramic composite material, the metal-ceramic composite material is composed of titanium carbide, titanium nitride, niobium carbide and metal, the tough layer is a substrate for manufacturing the tool, and the cutting edge of the tool has a micro-serrated structure along the length direction. The tool according to the present application can be sharp for a long time and is not prone to chipping or breaking.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen knives, and in particular to a knife and a method for manufacturing the knife. Background Art

[0002] Knives play a very important role in daily kitchen utensils. Currently, most kitchen knives are made of composite materials such as carbon steel and stainless steel. However, such knives are not sharp enough and can only be sharpened by thinning the edge, but this method will greatly reduce the service life of the knives.

[0003] For this reason, ceramic knives have gradually appeared on the market. Ceramic knives are formed by applying high pressure to precision ceramics. They retain the high strength of the original ceramic material, making the knives extremely sharp during use. However, such knives are too brittle and have low toughness. After sharpening, the blade will become very thin and easily break or fracture. Therefore, the long-lasting sharpness of existing knives still cannot meet the needs of consumers. Summary of the invention

[0004] Therefore, the purpose of the present application is to provide a tool and a method for manufacturing a tool so as to solve the problem of poor long-term sharpness performance of tools in the prior art. By forming alternating hard layers and tough layers along the length direction of the cutting edge of the tool, and grinding the tool along the thickness direction, under the same grinding conditions, the grinding amount of each layer in the length direction of the cutting edge of the tool will be different, thereby forming a tool with a micro-serrated structure on the cutting edge, thereby improving the long-term sharpness performance.

[0005] According to the first aspect of the present application, a tool is provided, wherein the surface of the cutting edge of the tool has a hard layer and a tough layer alternately distributed along the length direction, wherein the hard layer is formed by a metal-ceramic composite material, the metal-ceramic composite material is composed of titanium carbide, titanium nitride, niobium carbide and metal, the tough layer is a substrate for manufacturing the tool, and the cutting edge of the tool has a micro-serrated structure along the length direction.

[0006] In an embodiment, adjacent hard layers and tough layers are connected to each other, and the alternatingly distributed hard layers and tough layers are arranged at equal intervals in the length direction.

[0007] In an embodiment, the length of each hard layer is 100 μm-200 μm; the thickness of each hard layer is 0.1 mm-0.15 mm.

[0008] According to a second aspect of the present application, a method for manufacturing a cutting tool is provided, the method for manufacturing a cutting tool comprising the following steps: providing a cutting tool substrate; forming a hard layer and a tough layer alternately distributed along the length direction on the surface of the cutting edge portion of the cutting tool substrate; grinding the cutting edge portion having the hard layer and the tough layer along the thickness direction to obtain a cutting tool having a cutting edge portion having a micro-serrated structure formed by the alternating hard layer and the tough layer in the length direction, wherein the hard layer is formed by a metal-ceramic composite material composed of titanium carbide, titanium nitride, niobium carbide and metal, and the tough layer is a base material for manufacturing the cutting tool substrate.

[0009] In some embodiments, the step of forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction includes: coating a metal-ceramic composite material on the surface of the cutting edge portion of the tool substrate so that the cutting edge portion of the tool substrate has a continuously distributed hard layer along the length direction, and grinding the continuously distributed hard layer along the width direction of the tool substrate so that the tool substrate located in the cutting edge portion is exposed and the continuously distributed hard layer is separated into multiple layers along the length direction, thereby forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction, wherein the particle size of the metal-ceramic composite material is 100nm-200nm.

[0010] In other embodiments, the step of forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction includes: using a fixture to cover the cutting edge portion of the tool base and coating a metal-ceramic composite material on the surface of the uncovered cutting edge portion, thereby forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction.

[0011] In an embodiment, based on the total weight of the metal-ceramic composite material, the weight of the titanium carbide accounts for 7%-21% of the total weight of the metal-ceramic composite material, the weight of the titanium nitride accounts for 7%-21% of the total weight of the metal-ceramic composite material, the weight of the niobium carbide accounts for 7%-21% of the total weight of the metal-ceramic composite material, and the weight of the metal accounts for 40%-56% of the total weight of the metal-ceramic composite material.

[0012] In an embodiment, the metal includes cobalt and nickel, wherein the weight ratio of the cobalt to the nickel is (1-2):(2-6).

[0013] In an embodiment, the hard layer is formed by plasma spraying the metal-ceramic composite material on a tool substrate.

[0014] In an embodiment, the hard layer and the tough layer have the same length, and the hard layer has a thickness of 0.1 mm-0.15 mm.

[0015] In an embodiment, the base material for manufacturing the tool base body is carbon steel or stainless steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects and features of the present application will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of a tool according to an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of a planar structure of a tool according to an embodiment of the present application;

[0019] Figure 3 yes Figure 2 A schematic diagram of the structure enlarged at position I in the middle;

[0020] Figure 4 The tool edge according to the embodiment of the present application Figure 1 Schematic diagram of the structure cut along the AA line;

[0021] Figure 5 The tool edge according to the embodiment of the present application Figure 1 Schematic diagram of the structure cut along line BB. DETAILED DESCRIPTION

[0022] As is known to all, the harder the material of a tool is, the less likely it is to curl the blade, but too hard a material will cause the cutting edge of the tool to break or fracture. For a tool, having both high toughness and high hardness can make the tool more durable and sharp. To this end, the present application is dedicated to providing a method for making a tool have both high hardness and toughness, and a tool with durable sharpness obtained thereby.

[0023] The inventor has found through research that by forming a hard layer and a tough layer that are alternately distributed along the length direction on the surface of the cutting edge of the tool, and grinding the tool along the thickness direction, under the same grinding conditions, the grinding amount of each layer on the surface of the cutting edge will be different, thereby forming a tool with a micro-serrated structure on the cutting edge. On the one hand, since the cutting edge of the micro-serrated structure is subjected to dispersed force, the "edge curling" phenomenon of the tool can be avoided. On the other hand, when the cutting edge of the micro-serrated structure collides with the hard material, the force is applied in a point manner. Compared with the continuous arc-shaped cutting edge structure that is subjected to line force, under the same force, the tip of the cutting edge of the micro-serrated structure exerts a greater pressure on the food, making it easier for the cutting edge to cut into the food, thereby enabling the tool to have better sharpness. In addition, since the blade edge of the tool has a hard layer with high strength and a tough layer with high toughness distributed alternately, the overall strength is moderate, so that a single hard layer is clamped between two tough layers, so that the hard layer of the blade edge is not easy to crack or break during the use of the tool. Moreover, the hardness of the hard layer is high, which is harder than the metal material used to make conventional tools, and has a higher sharpness after sharpening. By combining with the tough layer, the improved hard layer is not easy to crack or break due to its own brittleness, thereby further improving the long-term sharpness.

[0024] The inventive concept of the present application will be described in detail below in conjunction with exemplary embodiments.

[0025] According to the first aspect of the present application, a tool is provided. A hard layer and a tough layer are alternately distributed in the length direction on the surface of the cutting edge of the tool. The hard layer is formed by a metal-ceramic composite material, which is composed of titanium carbide, titanium nitride, niobium carbide and metal, and the tough layer is a substrate for manufacturing the tool. The cutting edge of the tool has a micro-serrated structure along the length direction.

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of a tool according to an embodiment of the present application. Figure 2 It is a schematic diagram of the planar structure of a tool according to an embodiment of the present application. Figure 3 yes Figure 2 The enlarged schematic diagram of the structure at I in the figure. Figure 1 and Figure 2 As shown, the knife 10 includes a blade body 11 and a cutting edge portion 12 connected to the blade body 11. The cutting edge portion 12 includes hard layers 121 and tough layers 122 that are alternately distributed and connected along the length direction on its surface. The length of each hard layer 121 is the same as or similar to the length of each tough layer 122. According to the knife of the present application, the micro-serration structure of the cutting edge portion 12 is tiny and visually consistent with the cutting edge portion of an ordinary knife. Figure 2 and Figure 3As shown, after magnification, it can be seen that the cutting edge of the cutting edge portion 12 of the tool 10 has a micro-serrated structure along the length direction.

[0027] Figure 4 and Figure 5 The cutting tools according to the embodiment of the present application are respectively along Figure 1 Schematic diagram of the structure cut through the AA and BB lines. Figure 4 and Figure 5 As shown, the hard layer 121 is a layer formed on the surface of the cutting edge, and the inside of the cutting edge and the tough layer 122 on the surface of the cutting edge are both base materials for manufacturing the tool.

[0028] In some embodiments, adjacent hard layers and tough layers are connected to each other, and the alternating hard layers and tough layers are arranged at equal intervals in the length direction. In an exemplary embodiment, the length of the hard layer is L1, and the length of the tough layer is L2. That is to say, along the length direction of the cutting edge, each layer is distributed at equal intervals. Of course, the present application does not limit the length of the hard layer and the tough layer to be exactly the same. In other embodiments, the length of the hard layer and the tough layer in the length direction is not much different. In an exemplary embodiment, the length of the hard layer can be 100μm-200μm, and the length of the tough layer can be 100μm-200μm.

[0029] In order to make it easier for the hard layer and the tough layer to form a suitable micro-serration structure during the subsequent grinding process, it is necessary to set the adjacent hard layer and the tough layer to have a suitable hardness difference. In an exemplary embodiment, the hardness difference between the adjacent hard layer and the tough layer can be in the range of HRA10-15. In the actual manufacturing process, the adjacent hard layer and the tough layer can have a suitable hardness difference by changing the substrate for manufacturing the tool and / or changing the weight ratio of each component in the metal-ceramic composite material.

[0030] According to the present application, the hard layer on the surface of the cutting edge portion needs to have a suitable thickness so as to prevent the tool from being worn during long-term use. In an exemplary embodiment, the thickness of the hard layer is 0.1 mm-0.15 mm.

[0031] According to the present application, the height of each sawtooth of the micro-serration structure is in the range of 100 μm-200 μm, and the width is in the range of 100 μm-200 μm. According to the present application, the shape of the micro-serration structure can be set according to actual needs, and the present application does not limit it to be formed as a rack-like structure in the extension direction of the tool edge (i.e., the length direction of the tool). According to the micro-serration structure of the present application, for example, but not limited to, a continuous wavy structure is formed in the extension direction of the tool edge (see Figure 3). According to the micro-serrated structure of the present application, in the thickness direction of the tool, the teeth of each micro-serrated structure can be an inverted cone structure. It should be noted that the tip of the micro-serrated structure of the present application can be selected according to actual needs, for example but not limited to, determined according to the application of the tool and the cutting requirements of the tool (hardness of the object to be cut, etc.). It should be noted that in the example shown in the accompanying drawings of the present application, the extension direction of the tool edge is the same as the length direction, and the cutting edge of the cutting edge is a straight strip. However, the present application is not limited to this, for example but not limited to, the cutting edge of the present application can also be arc-shaped.

[0032] According to the present application, the toughness layer is a substrate for manufacturing the tool. Among the substrates for manufacturing the tool, stainless steel is relatively easy to obtain and corrosion-resistant, and is inexpensive, while carbon steel has a higher hardness. In an exemplary embodiment, the substrate for manufacturing the tool can be a stainless steel material or a carbon steel material. This will be described in detail later.

[0033] According to a second aspect of the present application, a method for manufacturing a cutting tool is provided. The method for manufacturing a cutting tool comprises the following steps:

[0034] Step S101, providing a tool base.

[0035] Step S102, forming a hard layer and a tough layer alternately distributed along the length direction on the surface of the cutting edge of the tool substrate, wherein the hard layer is formed by a metal-ceramic composite material, the metal-ceramic composite material is composed of titanium carbide, titanium nitride, niobium carbide and metal, and the tough layer is a base material for manufacturing the tool substrate.

[0036] Step S103, grinding the cutting edge portion having the hard layer and the tough layer, so as to obtain a tool having a cutting edge portion having a micro-serrated structure formed by hard layers and tough layers alternately distributed in the length direction.

[0037] According to the method for manufacturing a tool of the present application, a tool base having a cutting edge portion with a hard layer and a tough layer alternately distributed along the length direction is formed, that is, the hardness of the cutting edge portion of the tool base along the length direction is alternately distributed. By grinding the cutting edge portion of the tool base having a hard layer and a tough layer along its thickness direction, under the same grinding conditions, the grinding amount of the cutting edge portion along the length direction will be different, which is conducive to forming a cutting edge portion of a tool with a micro-serrated structure. On the one hand, since the cutting edge portion of the micro-serrated structure is subjected to dispersed force, the "curling edge" phenomenon of the tool can be avoided; on the other hand, when the cutting edge portion of the micro-serrated structure hits the hard material, its force mode is point force. Compared with the continuous arc-shaped cutting edge structure with a line force mode, under the same force, the tip of the cutting edge portion of the micro-serrated structure acts on the food with a greater pressure, making it easier for the cutting edge portion to cut into the food, so that the tool can have better sharpness. In addition, since the blade edge of the tool has a hard layer with high strength and a tough layer with high toughness distributed alternately, the overall strength is moderate, so that a single hard layer is sandwiched between two tough layers, so that the hard layer of the blade edge is not easy to crack or break during the use of the tool. And the hardness of the hard layer is high, harder than the metal material used to make conventional tools, and has a higher sharpness after sharpening. After being combined with the tough layer, the improved hard layer is not easy to crack or break due to its own brittleness, thereby further improving the long-term sharpness.

[0038] Hereinafter, a method for manufacturing a cutting tool according to the present application will be described in detail.

[0039] Provide tool base

[0040] According to the present application, providing a tool matrix includes preparing a substrate for manufacturing a tool, the substrate for manufacturing the tool can be in powder or strip form, and the substrate is made into a tool matrix using conventional steps in the art. Among them, the substrate for manufacturing the tool can be carbon steel or stainless steel. In an exemplary embodiment, the stainless steel material can be martensitic stainless steel. Martensitic stainless steel can include 3Cr13 stainless steel, 4Cr13 stainless steel, 5Cr15MoV stainless steel, 6Cr13MoV stainless steel, 7Cr17MoV stainless steel and 102Cr17MoV stainless steel. According to the present application, the higher the carbon content of the stainless steel material, the higher the hardness of the tool matrix formed by it. Taking the above example as an example, the order of the carbon content of the stainless steel material from small to large is: 3Cr13 stainless steel, 4Cr13 stainless steel, 5Cr15MoV stainless steel, 6Cr13MoV stainless steel, 7Cr17MoV stainless steel, 102Cr17MoV stainless steel. In an exemplary embodiment, the carbon steel is an iron-carbon alloy with a carbon content of 0.0218%-2.11%.

[0041] Preparation of metal-ceramic composites

[0042] The carbon content of carbide-based metal ceramic materials will be lost, affecting the expected performance. According to the present application, the metal ceramic composite material is composed of titanium carbide, titanium nitride, niobium carbide and metal. The metal ceramic composite material used in the tool according to the present application is prepared by a certain weight ratio of each component, which can reduce the impact of the loss of carbon content. In an exemplary embodiment, the weight of titanium carbide accounts for 7%-21% of the total weight of the metal ceramic composite material, the weight of titanium nitride accounts for 7%-21% of the total weight of the metal ceramic composite material, the weight of niobium carbide accounts for 7%-21% of the total weight of the metal ceramic composite material, and the weight of metal accounts for 40%-56% of the total weight of the metal ceramic composite material. The metal ceramic composite material can be formed by mixing the above-mentioned raw materials according to the weight ratio, and the mixed powder is used as the metal ceramic composite material of the present application. The hardness of titanium carbide is too high. As a material for forming a hard layer alone, the formed tool is prone to chipping. According to the present application, the metal-ceramic composite material includes titanium carbide and titanium nitride. After plasma spraying, titanium carbide and titanium nitride will form a solid solution of titanium carbonitride. Compared with single titanium carbide, the hard layer has better toughness.

[0043] According to the present application, there are many metals to choose from in the metal-ceramic composite material, where the metal acts as a "binder" so that the metal-ceramic composite material has a good bonding force with the tool substrate. Considering the manufacturing cost and bonding effect, in an exemplary embodiment, the metal is composed of cobalt and nickel, and the weight ratio of cobalt to nickel is 1-2:2-6. Cobalt has the best bonding effect, followed by nickel, but since the reserves of cobalt are small and the reserves of Ni are abundant, the combination of the two can reduce the cost of the binder without affecting the performance.

[0044] In the metal-ceramic composite material, titanium carbide can improve the hardness of the metal-ceramic composite material. According to an exemplary embodiment of the present invention, the weight percentage of titanium carbide can be 7%-21%, preferably, 10%-20%, and more preferably, 12%-18%. If the weight percentage of titanium carbide is less than 7%, the hardness of the metal-ceramic composite material is too low, and thus the hardness of the hard layer obtained thereby is also low, thereby reducing the sharpness and long-lasting sharpness of the manufactured tool, and if the weight percentage of titanium carbide is higher than 21%, the hardness of the metal-ceramic composite material is too high, and thus the hardness of the hard layer obtained thereby is also too high, resulting in large brittleness, thereby making the manufactured tool brittle, affecting the use experience and service life, and reducing the long-lasting sharpness.

[0045] In metal-ceramic composite materials, titanium nitride can increase the hardness of metal-ceramic composite materials and improve the performance of titanium carbide, so that the metal-ceramic composite materials have higher hardness without increasing brittleness, making the metal ceramics more wear-resistant. Since titanium carbide and titanium nitride have the same lattice structure, both belong to face-centered cubic structure, and can form a mutually soluble solid solution during the composite process. According to an exemplary embodiment of the present invention, the weight percentage of titanium nitride can be 7%-21%, preferably 10%-20%, and more preferably 12%-18%. If the weight percentage of titanium nitride is less than 7%, the carbon content in the metal-ceramic composite material is too high and the brittleness is large, and if the weight percentage of titanium nitride is higher than 21%, the nitrogen content in the metal-ceramic composite material is too high, and the effect of improving the hardness is limited.

[0046] In the metal-ceramic composite material, niobium carbide can refine the grains of the metal-ceramic composite material, improve the comprehensive performance of hardness and toughness, and thus improve the strength of the micro-serration structure of the cutting edge. According to an exemplary embodiment of the present invention, the weight percentage of niobium carbide can be 7%-21%, preferably 10%-20%, and more preferably 12%-18%. If the weight percentage of niobium carbide is less than 7%, the grains are not fully refined and the comprehensive performance is low, while if the weight percentage of niobium carbide is higher than 21%, it will affect the carbon and nitrogen content of the metal-ceramic composite material, thereby reducing the hardness, affecting the sharpness and long-term sharpness.

[0047] In the metal-ceramic composite material, the metal acts as a binder to improve the toughness of the metal-ceramic composite material. According to an exemplary embodiment of the present invention, the weight percentage of the metal can be 40%-56%, preferably 45%-55%, and more preferably 45%-50%. If the weight percentage of the metal is less than 40%, the toughness of the metal-ceramic composite material is low and the brittleness is large, thereby reducing the long-term sharpness of the tool, and if the weight percentage of the metal is higher than 56%, it will affect the hardness of the metal-ceramic composite material, thereby reducing the long-term sharpness of the tool.

[0048] According to the present application, the raw material of the metal-ceramic composite material is granular, and the metal-ceramic composite material is prepared by a plasma spraying process. In an embodiment, the average particle size of the metal-ceramic composite material can be 100nm-200nm. If the particle size is too large, the prepared metal-ceramic composite material is unevenly dispersed, which increases the brittleness of the metal-ceramic composite material; if the particle size is too small, the specific surface area of ​​the particles increases, the surface activity increases, and it is easy to agglomerate and make the dispersion uneven. Here, the particle size difference of the metal-ceramic composite material can be small (relatively uniform), so that a hard layer with uniform structure can be formed. The particle size of the above-mentioned material can be the maximum length of each material particle, rather than specifically limiting the material to have a spherical or spherical shape. For example, but not limited to, when the material has an elliptical shape, the particle size of the material can refer to the length of its major axis.

[0049] A tool substrate having hard and tough layers alternately distributed at the cutting edge is formed

[0050] According to the present application, a hard layer can be formed on a tool substrate by using a metal-ceramic composite material in a layer-forming manner in the prior art. In an embodiment, a metal-ceramic composite material is formed into a hard layer by cladding. Since the melting point of the metal-ceramic composite material is relatively high, in an exemplary embodiment, the metal-ceramic composite material is coated on the cutting edge of the tool substrate by plasma spraying. In these embodiments, according to the characteristics of the spraying process itself, during the spraying process, the blade substrate is not charged, does not melt, the matrix structure does not change, and does not cause thermal deformation of the cutting edge, so that a hard layer is formed by plasma spraying, which has little effect on the cutting edge, does not affect the performance of the cutting edge, and does not lead to an increase in subsequent leveling and other treatment processes. In addition, plasma spraying also has a high spraying efficiency and can reduce the operation time. In an exemplary embodiment, the parameters of plasma spraying are specifically: spraying distance: 60mm-130mm; temperature of the tool substrate: 100℃-200℃.

[0051] According to the present application, the thickness of the hard layer is 0.1mm-0.15mm. If the thickness of the spraying is too thick, it will affect the work efficiency, and in the case of forming a continuous hard layer, it will increase the difficulty of subsequent grinding. If the thickness of the spraying is too thin, it will be easily worn out during long-term use, and the function of enhancing long-lasting sharpness will disappear. The hard layer of the present application is formed by multiple claddings, and the thickness of each time is 0.01mm-0.03mm.

[0052] According to the present application, a metal-ceramic composite material is used to form a hard layer by plasma spraying. In order to make the generated plasma arc stable and more suitable for structures with smaller blade thickness, the plasma spraying step can be performed in an argon gas protection environment.

[0053] According to the present application, there are multiple ways to form a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction. In some embodiments, the step of forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction includes: coating a metal-ceramic composite material on the surface of the cutting edge portion of the tool substrate, so that the cutting edge portion of the tool substrate has a continuously distributed hard layer in the length direction; and grinding the continuously distributed hard layer along the width direction of the tool substrate, so that the tool substrate in the cutting edge portion is exposed and the continuously distributed hard layer is separated into multiple layers in the length direction, thereby forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction. In other embodiments, the step of forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction includes: using a fixture to cover the cutting edge portion of the tool substrate and coating a metal-ceramic composite material on the surface of the uncovered cutting edge portion, thereby forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction. It should be noted that the fixture here can form multiple hard layers spaced apart in the length direction after coating, and the tool substrate exposed at the cutting edge serves as a tough layer. It should be noted that the fixture has micropores at the micron level.

[0054] Forming tool

[0055] According to the present application, before the step of grinding the cutter base, the cutter manufacturing method further includes: performing roll forging on the cutter base at a predetermined temperature along the length direction, so that the hard layer of the cutter base is tightly combined with the material of the cutter base. In addition, by performing roll forging at a preset temperature, the thickness of the cutter base can be gradually reduced in the width direction, forming a kitchen cutter structure with uneven thickness. The specific parameters of the roll pressing treatment are a roll pressing pressure of 80MPa-120MPa and a roll pressing temperature of 500℃-700℃.

[0056] According to the present application, the parameters of the grinder are controlled to be consistent, and the grinder is used to grind along the thickness direction of the tool, so that the cutting edge of the cutting edge has a micro-serrated structure along the length direction.

[0057] like Figure 3As shown, the cutting edge of the cutting edge of the tool of the present application has a micro-serrated structure. Specifically, the above-mentioned tool substrate is ground along the thickness direction of the tool by a grinder. When the travel speed of the grinder is consistent, the grinding amount of the hard layer and the tough layer with alternating hardness distribution along the length direction will be different during the grinding process (different hardness leads to different grinding amounts). Among them, most of the hard layer with relatively large hardness can be retained at the cutting edge, and most of the tough layer with relatively small hardness will be ground off, so that the cutting edge of the cutting edge forms a fine micro-serrated structure along the length direction. Among them, the height of the micro-serrated structure is 100μm-200μm, and the width is 100μm-200μm.

[0058] The manufacturing method and tool of the tool of the present invention are described in detail above in combination with exemplary embodiments. In the following, the beneficial effects of the present invention will be described in more detail in combination with specific embodiments, but the protection scope of the present invention is not limited to the embodiments.

[0059] Example 1

[0060] The cutting tool according to Example 1 was prepared by the following method.

[0061] Step S10, providing a metal-ceramic composite material, wherein the metal-ceramic composite material is composed of 15% titanium carbide, 15% titanium carbide, 15% niobium carbide and 55% metal, wherein the metal is a powder of cobalt and nickel mixed in a weight ratio of 1:1.

[0062] Step S20, providing a tool base body with an average thickness of 1 mm at the cutting edge, wherein the tool base body is made of 4Cr13 stainless steel.

[0063] Step S30, manufacturing a cutting edge portion having hard layers and tough layers alternately distributed in the length direction.

[0064] Step S31, plasma spraying a metal-ceramic composite material on the surface of the cutting edge of the tool substrate, so that the cutting edge of the tool substrate has a continuously distributed hard layer along the length direction. The parameters of the plasma spraying are: the spraying distance is 130 mm; the temperature of the tool substrate is 200°C.

[0065] Step S32, grinding the continuously distributed hard layer along the width direction of the tool base body, so that the base material in the cutting edge is exposed and the continuously distributed hard layer is divided into multiple layers along the length direction, thereby forming a cutting edge portion having a hard layer and a tough layer alternately distributed in the length direction.

[0066] Step S40, after heating, the obtained tool base body is roll-forged along the length direction, so as to form a tool base body with an average thickness of 1 mm at the cutting edge, wherein the pressure of the roll-forging process is 90 MPa and the temperature is 600°C.

[0067] Step S50, grinding the tool substrate in the thickness direction by a grinder, so as to form a micro-serration structure at the cutting edge to obtain the tool of Example 1. The height of the teeth of the micro-serration structure is 100 μm, and the width is 100 μm.

[0068] Example 2

[0069] Step S10, providing a metal-ceramic composite material, wherein the metal-ceramic composite material is composed of 15% titanium carbide, 15% titanium carbide, 15% niobium carbide and 55% metal, wherein the metal is a powder of cobalt and nickel mixed in a weight ratio of 1:1.

[0070] Step S20, providing a tool base body with an average thickness of 1 mm at the cutting edge.

[0071] Step S30, manufacturing a cutting edge portion having hard layers and tough layers alternately distributed in the length direction.

[0072] Specifically, a fixture is used to shield the cutting edge of the tool substrate and a metal-ceramic composite material is plasma sprayed on the surface of the unshielded cutting edge, thereby forming a tool substrate having hard layers and tough layers alternately distributed along the length direction. The parameters of the plasma spraying are: the spraying distance is 130 mm; the temperature of the tool substrate is 200°C.

[0073] Step S40, heating the formed tool base and then performing roll forging along the length direction to form a tool base with an average thickness of 1 mm at the cutting edge, wherein the pressure of the roll forging is 90 MPa and the temperature is 600°C.

[0074] Step S50, grinding the tool base in the thickness direction by a grinder to form a micro-serration structure at the cutting edge, wherein the height of the micro-serration structure teeth is 100 μm and the width is 100 μm, thereby obtaining the tool of Example 2.

[0075] Example 3

[0076] The tool of Example 3 is manufactured by the same method as Example 1, except that 3Cr13 stainless steel is used instead of 4Cr13 stainless steel to make the tool substrate.

[0077] Example 4

[0078] The tool of Example 4 is manufactured by the same method as Example 1, except that 5Cr15MoV stainless steel is used instead of 4Cr13 stainless steel to make the tool substrate.

[0079] Example 5

[0080] The tool of Example 5 is manufactured by the same method as Example 1, except that 6Cr13MoV stainless steel is used instead of 4Cr13 stainless steel to make the tool substrate.

[0081] Example 6

[0082] The tool of Example 6 is manufactured by the same method as Example 1, except that 7Cr17MoV stainless steel is used instead of 4Cr13 stainless steel to make the tool substrate.

[0083] Example 7

[0084] The tool of Example 7 is manufactured by the same method as Example 1, except that 102Cr17MoV stainless steel is used instead of 4Cr13 stainless steel to make the tool substrate.

[0085] Example 8

[0086] The tool of Example 8 is manufactured by the same method as Example 1, except that carbon steel with a carbon content of 1% is used instead of 4Cr13 stainless steel to make the tool substrate.

[0087] Example 9

[0088] The tool of Example 9 was manufactured by the same method as Example 1, except that the metal-ceramic composite material consisted of 20% titanium carbide, 20% titanium carbide, 20% niobium carbide and 40% metal.

[0089] Example 10

[0090] The tool of Example 10 was manufactured by the same method as Example 1, except that the metal-ceramic composite material consisted of 18% titanium carbide, 18% titanium carbide, 18% niobium carbide and 46% metal.

[0091] Comparative Example 1

[0092] The average thickness of the cutting edge is 1mm.

[0093] Comparative Example 2

[0094] The average thickness of the cutting edge is 1mm.

[0095] Comparative Example 3

[0096] The average thickness of the cutting edge is 1mm. 5Cr15MoV stainless steel knife.

[0097] Comparative Example 4

[0098] The average thickness of the cutting edge is 1mm.

[0099] Comparative Example 5

[0100] The average thickness of the cutting edge is 1mm.

[0101] Comparative Example 6

[0102] The average thickness of the cutting edge is 1mm. 102Cr17MoV stainless steel knife.

[0103] Comparative Example 7

[0104] The average thickness of the cutting edge is 1mm.

[0105] It should be noted that the plasma spraying parameters in Examples 1-10 are consistent.

[0106] Performance index test

[0107] The thickness of the cutting edge of the tool in Examples 1-10 and Comparative Examples 1-7 is the same, and performance index tests are performed on them respectively, and the test results are recorded in the following Table 1. The performance test method is as follows:

[0108] (1) Initial sharpness: Refer to the sharpness test method in GBT 40356-2021 Kitchen Knives. The larger the sharpness value, the better the initial sharpness, and the smaller the sharpness value, the opposite.

[0109] (2) Test method for long-lasting sharpness:

[0110] The lasting sharpness adopts the simulated tool life test method. The specific method is described below. The larger the value of the lasting sharpness, the longer the initial sharpness and lasting sharpness life. The smaller the value of the lasting sharpness, the opposite is true.

[0111] The specific method of simulating tool life test is as follows: fix the tested tool edge horizontally downward on the tool fixture, and after adding weights, press it on the simulation with a pressure of 16N. The cutting simulation (3mm kraft paper) remains stationary, and the tool fixture is driven by a motor and air pressure to drive the tool to cut in the X-axis direction, with a reciprocating speed of 50mm / s. At the same time, it rises in the Z-axis direction and moves 1mm in the Y-axis direction to shape the simulation. The cutting stroke is 100mm, and it ends after cutting the simulation 5 times. The evaluation object (ham sausage) is used to determine the tool's long-term 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, which is the tool's long-term sharpness. The more total cuts, the higher the long-term sharpness.

[0112] Table 1 Performance test data of the embodiments of the present application and the comparative examples

[0113]

[0114] In summary, the above tests show that the long-term sharpness of the knife of the present application is significantly improved. At the same time, the toughness layer with better toughness is used to ensure the service life, and the hard layer with higher hardness is used to ensure the sharpness. By combining multiple materials, a long-term sharp knife suitable for people can be obtained. The knife made according to the present application can be long-term sharp and is not prone to chipping or breaking.

[0115] Although the embodiments of the present application have been described in detail above, those skilled in the art may make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. However, it should be understood that, in the opinion of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present application defined by the claims.

Claims

1. A method for manufacturing a cutting tool, characterized in that: The method for manufacturing a tool comprises the following steps: Providing a tool base; Coating a metal-ceramic composite material on the surface of the cutting edge of the tool substrate, thereby forming a hard layer and a tough layer alternately distributed along the length direction on the surface of the cutting edge of the tool substrate; The cutting edge portion having the hard layer and the tough layer is ground along the thickness direction to obtain a tool having a cutting edge portion having a micro-serrated structure formed by the hard layer and the tough layer alternately distributed in the length direction, The hard layer is formed by a metal-ceramic composite material, which is composed of titanium carbide, titanium nitride, niobium carbide and metal, and the tough layer is a base material for manufacturing a tool substrate.

2. The method for manufacturing a tool according to claim 1, characterized in that: The step of forming a cutting edge portion having a hard layer and a tough layer alternately distributed in a length direction comprises: Coating the metal-ceramic composite material so that the cutting edge of the tool substrate has a continuously distributed hard layer along the length direction; and The continuously distributed hard layer is grinded along the width direction of the tool base, so that the tool base located in the cutting edge is exposed and the continuously distributed hard layer is divided into multiple layers along the length direction, thereby forming a cutting edge portion whose surface has hard layers and tough layers alternately distributed in the length direction.

3. The method for manufacturing a tool according to claim 1, characterized in that: The step of forming a cutting edge portion having a hard layer and a tough layer alternately distributed in a length direction comprises: A fixture is used to cover the cutting edge of the tool base body and a metal-ceramic composite material is coated on the surface of the uncovered cutting edge, thereby forming a cutting edge having a hard layer and a tough layer alternately distributed in the length direction.

4. The method for manufacturing a cutting tool according to claim 1, characterized in that: The metal includes cobalt and nickel, wherein the weight ratio of the cobalt to the nickel is (1-2):(2-6).

5. The method for manufacturing a cutting tool according to claim 1, characterized in that: The hard layer and the tough layer have the same length.

6. The method for manufacturing a cutting tool according to claim 1, characterized in that: Based on the total weight of the metal-ceramic composite material, the weight of the titanium carbide accounts for 7%-21%, the weight of the titanium nitride accounts for 7%-21%, the weight of the niobium carbide accounts for 7%-21%, and the weight of the metal accounts for 40%-56%; and / or the particle size of the metal-ceramic composite material is 100nm-200nm.

7. The method for manufacturing a cutting tool according to claim 1, characterized in that: The base material for manufacturing the tool base body is carbon steel or stainless steel.

8. The method for manufacturing a cutting tool according to claim 1, characterized in that: Adjacent hard layers and tough layers are connected to each other, and the alternatingly distributed hard layers and tough layers are arranged in the length direction.

9. The method for manufacturing a tool according to any one of claims 1 to 8, characterized in that: The length of the hard layer is 100 μm-200 μm; and / or the thickness of the hard layer is 0.1 mm-0.15 mm.

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