CN115464689A - Knives and method of making knives - Google Patents

Abstract

The present application provides a knife and a method of manufacturing the knife. Among them, the surface of the cutting edge of the tool along the length direction is provided with alternately distributed hard layers and tough layers, wherein the hard layer is formed by a metal-ceramic composite material, and the metal-ceramic composite material is made of titanium carbide, titanium nitride Composed of , niobium carbide and metal, the tough layer is the base material for making knives, and the cutting edge of the knives has a micro-serrated structure along the length direction. According to the knife of the present application, it can be sharp for a long time, and it is not easy to chip or break.

Description

Knives and method of manufacturing knives

technical field

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

Background technique

Knives play a very important role in everyday kitchen utensils. At present, kitchen knives are mostly made of carbon steel, stainless steel and other materials. However, this kind of knives will be lacking in sharpness. The sharpness can only be increased by thinning the cutting edge, but this method will greatly affect Tool life.

For this reason, ceramic knives have gradually appeared on the market. Ceramic knives are formed by developing precision ceramics under high pressure, which retains 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 easy to chip or break. Therefore the lasting sharpness performance of existing cutter still can not satisfy consumer's use demand.

Contents of the invention

Therefore, the purpose of the present application is to provide a kind of knife and the method of manufacturing knife, to solve the problem of the poor durable sharpness performance of the knife in the prior art, by forming alternately distributed hard layer and toughness layer, when the tool is ground 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, so that a microscopic The knife with serrated structure can improve the performance of long-lasting sharpness.

According to the first aspect of the present application, a cutting tool is provided, the surface of the cutting edge portion of the cutting tool has a hard layer and a tough layer alternately distributed along the length direction, wherein the hard layer is made of a metal-ceramic composite material Formed, the metal-ceramic composite material is composed of titanium carbide, titanium nitride, niobium carbide and metal, the toughness layer is the base material for making the cutter, and the cutting edge of the cutter has a micro-serrated structure along the length direction .

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

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.

According to the second aspect of the present application, there is provided a method of manufacturing a knife, the method of manufacturing a knife includes the following steps: providing a knife base; hard layer and tough layer; grinding the cutting edge portion with hard layer and tough layer along the thickness direction to obtain a micro-serrated structure formed by the alternately distributed hard layer and tough layer in the length direction A cutting tool at the cutting edge, wherein the hard layer is formed of 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 the matrix for manufacturing the tool base material.

In some embodiments, the step of forming a cutting edge portion whose surface has hard layers and tough layers distributed alternately in the length direction comprises: coating a metal-ceramic composite material on the surface of the cutting edge portion of the tool base, Make the cutting edge of the cutter base have a continuously distributed hard layer along the length direction, and grind the continuously distributed hard layer along the width direction of the cutter base, so that the cutter base located in the cutting edge is exposed and the The continuously distributed hard layer is divided into a plurality along the length direction, thereby forming a cutting edge portion whose surface has a hard layer and a tough layer alternately distributed in the length direction, wherein the cermet composite material The particle size is 100nm-200nm.

In some other embodiments, the step of forming the cutting edge portion whose surface has hard layers and tough layers alternately distributed in the length direction includes: using a jig to cover the cutting edge portion of the tool base and placing the unshielded cutting edge portion The surface is coated with metal-ceramic composite material, so as to form a cutting edge portion with hard layers and tough layers alternately distributed in the length direction.

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

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

In an embodiment, the hard layer is formed by plasma spraying the cermet composite material on the tool base.

In an embodiment, the length of the hard layer and the tough layer are the same, and the thickness of the hard layer is 0.1mm-0.15mm.

In an embodiment, the base material for manufacturing the tool base is carbon steel or stainless steel.

Description of drawings

Through the following description of the embodiments in conjunction with the accompanying drawings, the above and other purposes and features of the present application will become more clear, in the accompanying drawings:

FIG. 1 is a schematic diagram of a three-dimensional structure of a cutter according to an embodiment of the present application;

Fig. 2 is a schematic plan view of a cutter according to an embodiment of the present application;

Fig. 3 is the structural enlarged schematic view of I place in Fig. 2;

Fig. 4 is a schematic diagram of the structure of the cutting tool according to the embodiment of the present application cut along the A-A line in Fig. 1;

Fig. 5 is a schematic diagram of the structure of the cutting tool according to the embodiment of the present application, taken along line B-B in Fig. 1 .

detailed description

As we all know, the harder the material of the knife, the less likely it is to roll the edge, but if the material is too hard, it will cause the edge of the knife to chip or break. For knives, having both high toughness and high hardness can make the long-lasting sharpness of the knives better. For this reason, the present application is dedicated to providing a method for making a knife have both high hardness and toughness, and a knife with durable sharpness thus obtained.

The inventor found through research that by forming hard layers and tough layers alternately distributed along the length direction on the surface of the cutting edge of the tool, the cutting tool is ground along the thickness direction. The amount of grinding of each layer on the surface of the tool will vary, resulting in a tool with a micro-serrated structure on the cutting edge. On the one hand, due to the dispersed force on the cutting edge of the micro-serration structure, it can avoid the phenomenon of "rolling edge" of the tool. On the other hand, when the cutting edge of the micro-sawtooth structure hits the hard material, its force is point force, compared with the continuous arc-shaped edge structure in which the force is line force, In the case of the same force, the tip of the micro-serrated cutting edge acts on the food with greater pressure, making it easier for the cutting edge to cut into the food, so the knife can have better sharpness. In addition, due to the moderate strength of the overall cutting edge part of the tool, where the hard layer with high strength and the tough layer with high toughness are alternately distributed, a single hard layer is clamped between the two tough layers, so that the The hard layer at the cutting edge is not easy to crack or break during use. Moreover, the hardness of the hard layer is high, harder than conventional metal materials used to make knives, and has a higher sharpness after sharpening. By combining with the toughness layer, the improved hard layer is not easy to be damaged by itself. The brittleness and cracking or fracture can further improve the lasting sharpness.

The inventive concept of the present application will be described in detail below with reference to exemplary embodiments.

According to the first aspect of the present application there is provided a knife. Wherein, on the surface of the cutting edge portion of the cutter, there are hard layers and tough layers alternately distributed in the length direction. Among them, the hard layer is formed by cermet composite material, the cermet composite material is composed of titanium carbide, titanium nitride, niobium carbide and metal, the tough layer is the base material for making the tool, and the cutting edge of the tool has along the length direction Micro sawtooth structure.

Fig. 1 is a schematic perspective view of a cutter according to an embodiment of the present application. Fig. 2 is a schematic plan view of a cutter according to an embodiment of the present application. Fig. 3 is an enlarged schematic diagram of the structure at I in Fig. 2 . As shown in FIGS. 1 and 2 , the knife 10 includes a blade body 11 and a cutting edge portion 12 connected to the blade body 11 . Wherein, the cutting edge portion 12 includes hard layers 121 and tough layers 122 alternately distributed and connected along the length direction on the surface thereof. The length of each hard layer 121 is the same or similar to the length of each tough layer 122 . According to the knife of the present application, the micro-sawtooth structure of the cutting edge portion 12 is minute, and visually consistent with the cutting edge portion of an ordinary knife. As shown in FIG. 2 and FIG. 3 , it can be seen that the position of the cutting edge of the cutting edge portion 12 of the knife 10 has a micro-sawtooth structure along the length direction after enlargement.

Fig. 4 and Fig. 5 are structural schematic diagrams of the cutting tool according to the embodiment of the present application, respectively cut along line A-A and line B-B in Fig. 1 . As shown in Fig. 4 and Fig. 5, the hard layer 121 is a layer formed on the surface of the cutting edge, and the tough layer 122 inside the cutting edge and on the surface of the cutting edge are both base materials for making knives.

In some embodiments, adjacent hard layers and tough layers are connected to each other, and the alternately distributed 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 portion, each layer is distributed at equal intervals. Of course, the present application does not limit that the dimensions of the texture layer and the toughness layer in the length direction must be exactly the same. In some other embodiments, the size of the hard layer and the tough layer are not much different in the length direction. In an exemplary embodiment, the length of the hard layer may be 100 μm-200 μm, and the length of the tough layer may be 100 μm-200 μm.

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

According to the present application, the hard layer on the surface of the cutting edge portion needs to have an appropriate thickness for wear of the tool during long-term use. In an exemplary embodiment, the thickness of the hard layer is 0.1 mm-0.15 mm.

According to the present application, the height of each sawtooth of the micro sawtooth 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-sawtooth structure can be set according to actual needs, and the present application does not limit that it must be formed as a rack-shaped structure in the extending direction of the cutting edge (ie, the length direction of the cutting tool). According to the micro-sawtooth structure of the present application, for example but not limited to, a continuous wavy structure is formed along the extending direction of the cutting edge (see FIG. 3 ). According to the micro-serration structure of the present application, in the thickness direction of the tool, the teeth of each micro-serration structure may be in an inverted tapered structure. It should be noted that the tip of the micro-sawtooth structure of the present application can be selected according to actual needs, for example, but not limited to, 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 examples shown in the accompanying drawings of the present application, the extending direction of the cutting edge of the tool is the same as the longitudinal direction, and the cutting edge of the cutting edge is straight. However, the present application is not limited thereto. For example but not limited thereto, the cutting edge of the present application may also be arc-shaped.

According to the application, the tough layer is the base material from which the knife is manufactured. Among the base materials for making knives, stainless steel is relatively easy to obtain, corrosion-resistant, and inexpensive, and carbon steel has high hardness. In an exemplary embodiment, the base material from which the knife is made may be stainless steel or carbon steel. This will be described in detail later.

According to a second aspect of the present application there is provided a method of manufacturing a knife. Wherein, the method for manufacturing cutter comprises the following steps:

Step S101, providing a tool base.

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 base, wherein the hard layer is formed of a metal-ceramic composite material, and the metal-ceramic composite material is made of titanium carbide, nitride Composed of titanium, niobium carbide and metal, the tough layer is the base material for the manufacture of the tool base.

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

According to the method for manufacturing the cutting tool of the present application, the cutting tool base body having the cutting edge portion of the hard layer and the tough layer distributed alternately along the length direction is formed, that is to say, the hardness of the cutting edge portion of the cutting tool base body along the length direction is high or low. Alternate distribution. By grinding the cutting edge of the tool base with a hard layer and a tough layer along its thickness direction, under the same grinding conditions, the grinding amount of the cutting edge along the length direction will be different, which is conducive to the formation of micro The cutting edge of the sawtooth structure. On the one hand, due to the dispersed force on the cutting edge of the micro-serration structure, the phenomenon of "rolling the edge" of the tool can be avoided; on the other hand, when the cutting edge of the micro-serration structure hits the hard material, its force is Point force, compared with the continuous arc-shaped cutting edge structure with linear force, under the same force, the tip of the cutting edge of the micro-serrated structure acts on the food more strongly. The larger the cutting edge, the easier it is to cut into the food, so the knife can have better sharpness. In addition, due to the moderate strength of the overall cutting edge part of the tool, where the hard layer with high strength and the tough layer with high toughness are alternately distributed, a single hard layer is clamped between the two tough layers, so that the The hard layer at the cutting edge is not easy to crack or break during use. Moreover, the hardness of the hard layer is high, harder than the metal material used to make knives, and has a higher sharpness after cutting. After being combined with the tough layer, the improved hard layer is not easy to be damaged by itself. The brittleness and cracking or fracture can further improve the lasting sharpness.

Hereinafter, a method of manufacturing a knife according to the present application will be described in detail.

Provide tool base

According to the present application, providing the tool base includes preparing the base material for making the tool. The base material for making the tool can be in the form of powder or strip, and the base material is made into the tool base by conventional steps in the art. Wherein, the base material for manufacturing the cutter can be carbon steel or stainless steel. In an exemplary embodiment, the stainless steel material may be martensitic stainless steel. Martensitic stainless steel may 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 base body formed therefrom. Taking the above example as an example, the order of carbon content of stainless steel materials 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 ranging from 0.0218% to 2.11%.

Preparation of metal-ceramic composites

The carbon content of carbide-based cermet materials will be depleted and affect the expected performance. According to the application, the cermet composite material is composed of titanium carbide, titanium nitride, niobium carbide and metal. The cermet composite material used in the cutting tool according to the present application is prepared by each component according to a certain weight ratio, which can reduce the influence caused by 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, and the weight of niobium carbide The weight 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 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, and as a material for forming the hard layer alone, the formed tool is prone to chipping. According to the present application, titanium carbide and titanium nitride are included in the cermet composite material. After plasma spraying, titanium carbide and titanium nitride will form a solid solution of titanium carbonitride. Compared with titanium carbide alone, the hard layer has Better toughness.

According to the present application, there are many metals that can be selected in the metal-ceramic composite material, where the metal acts as a "binder" so that the metal-ceramic composite material has a better bonding force with the tool matrix. Considering manufacturing cost and bonding effect, in an exemplary embodiment, the metal is composed of cobalt and nickel, and the weight ratio of cobalt and nickel is 1-2:2-6. Cobalt has the best bonding effect, followed by nickel, but because 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.

In metal-ceramic composites, titanium carbide can increase the hardness of metal-ceramic composites. According to an exemplary embodiment of the present invention, the weight percentage of titanium carbide may be 7%-21%, preferably 10%-20%, more preferably 12%-18%. If the weight percentage of titanium carbide is lower than 7%, the hardness of the metal-ceramic composite material is too low, so the hardness of the hard layer thus produced is also low, thereby reducing the sharpness and lasting sharpness of the produced cutter, And if the weight percentage of titanium carbide is higher than 21%, the hardness of the metal-ceramic composite material is too high, so the hardness of the hard layer made therefrom is also too high, resulting in high brittleness, so that the made tool is brittle. Affect the use experience and service life, reduce the lasting sharpness.

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, and make the metal-ceramic composite materials more wear-resistant. Since titanium carbide and titanium nitride have the same lattice structure, both of which belong to the face-centered cubic structure, they can form a miscible solid solution during the compounding process. According to an exemplary embodiment of the present invention, the weight percentage of titanium nitride may be 7%-21%, preferably 10%-20%, more preferably 12%-18%. If the weight percentage of titanium nitride is lower than 7%, the carbon content in the metal-ceramic composite is too high, and the brittleness is greater, while if the weight percentage of titanium nitride is higher than 21%, the nitrogen content in the metal-ceramic composite If it is too high, the improvement effect on hardness is limited.

In metal-ceramic composite materials, niobium carbide can refine the grains of metal-ceramic composite materials, improve the comprehensive performance of hardness and toughness, and thus improve the strength of the micro-serrated structure of the cutting edge. According to an exemplary embodiment of the present invention, the weight percentage of niobium carbide may be 7%-21%, preferably 10%-20%, more preferably 12%-18%. If the weight percentage of niobium carbide is lower than 7%, the grain refinement is insufficient, and the comprehensive performance is low, and if the weight percentage of niobium carbide is higher than 21%, it will affect the carbon and nitrogen content of the cermet composite material. It is the reduction of hardness, which affects the sharpness and long-lasting sharpness.

In metal-ceramic composites, the metal acts as a binder, which can improve the toughness of the metal-ceramic composite. According to an exemplary embodiment of the present invention, the weight percentage of the metal may be 40%-56%, preferably 45%-55%, more preferably 45%-50%. If the weight percentage of metal is less than 40%, the metal-ceramic composite will have lower toughness and greater brittleness, which will reduce the lasting sharpness of the knife, while if the weight percentage of metal is higher than 56%, it will affect the metal-ceramic composite. The hardness of the material reduces the lasting sharpness of the knife.

According to the present application, the raw material of the metal-ceramic composite material is granular, and the plasma spraying process is used to prepare the metal-ceramic composite material. In an embodiment, the average particle size of the cermet composite material may be 100 nm-200 nm. If the particle size is too large, the dispersion of the prepared metal-ceramic composite material will be uneven, which will increase the brittleness of the metal-ceramic composite material; if the particle size is too small, the specific surface area of the particles will increase, and the surface activity will increase, so that agglomeration will easily occur and the surface activity will increase. Uneven distribution. Here, the difference in particle size of the metal-ceramic composite material can be made small (relatively uniform), so that a hard layer with a uniform structure can be formed. The particle size of the above-mentioned materials may be the maximum length of each material particle, and is not specifically limited to the shape of the material being spherical or spherical. For example and without limitation, when a material has an elliptical shape, the particle size of the material may refer to the length of its major axis.

Forming a tool base with alternately distributed hard and tough layers at the cutting edge

According to the present application, the hard layer can be made of a metal-ceramic composite material on the tool base body by means of layer formation in the prior art. In the embodiment, the cermet composite material is made into a hard layer by cladding. Due to the relatively high melting point of the metal-ceramic composite material, in an exemplary embodiment, the metal-ceramic composite material is coated on the cutting edge of the tool base body by means of plasma spraying. In these embodiments, according to the characteristics of the spraying process itself, during the spraying process, the blade matrix is not charged, does not melt, the matrix structure does not change, and does not cause thermal deformation of the cutting edge, so that it is formed by plasma spraying. The hard layer has less impact on the cutting edge, will not affect the performance of the cutting edge and will not lead to additional treatment processes such as subsequent leveling. In addition, plasma spraying also has high spraying efficiency and can reduce working time. In an exemplary embodiment, the parameters of the plasma spraying are specifically: spraying distance: 60mm-130mm; temperature of the tool substrate: 100°C-200°C.

According to the present application, the thickness of the hard layer is 0.1mm-0.15mm. If the thickness of 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 treatment. If the thickness of the spray is too thin, it will be easily worn out during long-term use, but the function of enhancing the lasting sharpness will disappear. The hard layer of the present application is formed by multiple cladding, each time having a thickness of 0.01mm-0.03mm.

According to the present application, the hard layer is formed by plasma spraying using metal-ceramic composite materials. In order to make the generated plasma arc stable and more suitable for the structure with small blade thickness, the step of plasma spraying can be carried out under the environment of argon gas protection.

According to the present application, there are many ways to form the cutting edge portion with hard layers and tough layers alternately distributed along the length direction. In some embodiments, the step of forming the cutting edge portion with the hard layer and the tough layer alternately distributed in the length direction on the surface includes: coating the surface of the cutting edge portion of the cutter base body with a cermet composite material, so that the cutter The cutting edge portion of the base body has a continuously distributed hard layer along the length direction; and the continuously distributed hard layer is ground along the width direction of the tool base body, so that the tool base body in the cutting edge portion is exposed and the continuously distributed hard layer along the The longitudinal direction is divided into a plurality, thereby forming a cutting edge portion whose surface has hard layers and tough layers alternately distributed in the longitudinal direction. In some other embodiments, the step of forming the cutting edge portion whose surface has hard layers and tough layers alternately distributed in the length direction includes: using a jig to cover the cutting edge portion of the tool base and placing the unshielded cutting edge portion The surface is coated with metal-ceramic composite material, so as to form a cutting edge part with hard layers and tough layers alternately distributed in the length direction. It should be noted that the jig here can form a plurality of hard layers distributed at intervals in the length direction after coating, and the tool matrix exposed at the cutting edge serves as a tough layer. It should be noted that there are micro-holes on the jig.

forming tool

According to the present application, before the step of grinding the tool base, the tool manufacturing method further includes: rolling the tool base along the length direction at a predetermined temperature, so that the hard layer of the tool base and the material used to manufacture the tool base tightly bound. In addition, rolling forging at a preset temperature can make the thickness of the knife base gradually decrease in the width direction, forming a kitchen knife structure with uneven thickness. Wherein, the specific parameters of the rolling treatment are the rolling pressure of 80MPa-120MPa, and the rolling temperature of 500°C-700°C.

According to the present application, the parameters of the control grinding machine are consistent, and the grinding machine 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.

As shown in FIG. 3 , the cutting edge of the cutting edge of the knife of the present application has a micro-serrated structure. Specifically, the above-mentioned tool base is ground by a grinding machine along the thickness direction of the tool. When the speed of the grinding machine is consistent, the grinding amount of the hard layer and the tough layer whose hardness is alternately distributed along the length direction during the grinding process Will vary (different hardness results in different amount of grinding). Among them, most of the hard layer with relatively high hardness can be retained at the cutting edge, and most of the tough layer with relatively small hardness will be ground away, so that the cutting edge of the cutting edge can be cut along the length direction. A fine micro-serrated structure is formed. Wherein, the height of the micro sawtooth structure is 100 μm-200 μm, and the width is 100 μm-200 μm.

Above, the manufacturing method of the cutting tool and the cutting tool according to the concept of the present invention have been described in detail with reference to the exemplary embodiments. In the following, the beneficial effects of the concept of the present invention will be described in more detail in conjunction with specific embodiments, but the protection scope of the concept of the present invention is not limited to the embodiments.

Example 1

The cutter according to Example 1 was prepared by the following method.

Step S10, providing a cermet composite material. Among them, the cermet composite material is composed of 15% titanium carbide, 15% titanium carbide, 15% niobium carbide and 55% metal, wherein the metal is a powder mixed with cobalt and nickel in a weight ratio of 1:1.

Step S20, providing a tool base with an average thickness of the cutting edge of 1 mm. Among them, the tool base is made of 4Cr13 stainless steel.

Step S30, manufacturing a cutting edge portion with hard layers and tough layers alternately distributed in the length direction.

Step S31 , plasma spraying the metal-ceramic composite material on the surface of the cutting edge of the tool base, so that the cutting edge of the tool base has a continuous distribution of hard layers along the length direction. Among them, the parameters of the plasma spraying are: the spraying distance is 130mm; the temperature of the tool substrate is 200°C.

Step S32, grinding the continuously distributed hard layer along the width direction of the cutter base, so that the base material in the cutting edge portion is exposed and the continuously distributed hard layer is divided into a plurality along the length direction, thereby forming a surface with Alternately distributed hard layers and tough layers on the cutting edge.

In step S40, after heating, the obtained tool base body is subjected to roll forging along the longitudinal direction, so as to form a tool base body with an average thickness of the cutting edge portion of 1 mm. Among them, the pressure of the roll forging treatment is 90MPa, and the temperature is 600°C.

In step S50, the above-mentioned tool base is ground in the thickness direction by a grinder, so as to form a micro-serrated structure at the cutting edge to obtain the tool of Example 1. Wherein, the height of the teeth of the micro sawtooth structure is 100 μm, and the width is 100 μm.

Example 2

Step S10, providing a cermet composite material. Among them, the cermet composite material is composed of 15% titanium carbide, 15% titanium carbide, 15% niobium carbide and 55% metal, wherein the metal is a powder mixed with cobalt and nickel in a weight ratio of 1:1.

Step S20, providing a tool base with an average thickness of the cutting edge of 1 mm.

Step S30, manufacturing a cutting edge portion with hard layers and tough layers alternately distributed in the length direction.

Specifically, a jig is used to shield the cutting edge of the tool base and plasma spray the metal-ceramic composite material on the surface of the unshielded cutting edge, thereby forming a tool base with alternately distributed hard layers and tough layers along the length direction . Among them, the parameters of the plasma spraying are: the spraying distance is 130mm; the temperature of the tool substrate is 200°C.

Step S40 , heating the shaped tool base body and performing roll forging along the length direction, so as to form a tool base body with an average thickness of the cutting edge portion of 1 mm. Among them, the pressure of the roll forging treatment is 90MPa, and the temperature is 600°C.

In step S50, the above-mentioned tool base is ground in the thickness direction by a grinding machine, so as to form a micro-serration structure at the cutting edge. Wherein, the height of the teeth of the micro-sawtooth structure is 100 μm, and the width is 100 μm, so that the cutting tool of Example 2 is produced.

Example 3

Except that 3Cr13 stainless steel was used instead of 4Cr13 stainless steel to make the tool matrix, the same method as in Example 1 was used to manufacture the tool in Example 3.

Example 4

Except that 5Cr15MoV stainless steel was used instead of 4Cr13 stainless steel to make the tool matrix, the same method as Example 1 was used to manufacture the tool of Example 4.

Example 5

Except that 6Cr13MoV stainless steel was used instead of 4Cr13 stainless steel to make the tool matrix, the same method as Example 1 was used to manufacture the tool of Example 5.

Example 6

Except that 7Cr17MoV stainless steel was used instead of 4Cr13 stainless steel to make the tool matrix, the same method as in Example 1 was used to manufacture the tool of Example 6.

Example 7

Except that 102Cr17MoV stainless steel was used instead of 4Cr13 stainless steel to make the tool matrix, the same method as in Example 1 was used to manufacture the tool in Example 7.

Example 8

Except that carbon steel with a carbon content of 1% was used instead of 4Cr13 stainless steel to make the tool matrix, the same method as in Example 1 was used to manufacture the tool in Example 8.

Example 9

Except that the cermet composite material is composed of 20% titanium carbide, 20% titanium carbide, 20% niobium carbide and 40% metal, the cutting tool of example 9 is manufactured by the same method as example 1.

Example 10

The cutting tool of Example 10 was manufactured by the same method as Example 1, except that the cermet composite material was composed of 18% titanium carbide, 18% titanium carbide, 18% niobium carbide and 46% metal.

Comparative example 1

A 3Cr13 stainless steel knife with an average thickness of 1 mm at the cutting edge.

Comparative example 2

A 4Cr13 stainless steel knife with an average thickness of 1 mm at the cutting edge.

Comparative example 3

A 5Cr15MoV stainless steel knife with an average thickness of 1 mm at the cutting edge.

Comparative example 4

A 6Cr13MoV stainless steel knife with an average thickness of 1 mm at the cutting edge.

Comparative example 5

A 7Cr17MoV stainless steel knife with an average thickness of 1 mm at the cutting edge.

Comparative example 6

A 102Cr17MoV stainless steel knife with an average thickness of 1 mm at the cutting edge.

Comparative example 7

A carbon steel knife with an average thickness of the cutting edge of 1 mm.

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

performance index test

The thicknesses of the cutting edges of the cutters in Examples 1-10 and Comparative Examples 1-7 are the same, and performance index tests are performed on them respectively, and the test results are recorded in Table 1 below. The performance test method is as follows:

(1) Initial sharpness: refer to the sharpness test method in "GBT 40356-2021 Kitchen Knives". The larger the sharpness value is, the better the initial sharpness is, and the smaller the sharpness value is, the opposite is true.

(2) Test method for lasting sharpness:

Durable sharpness adopts the simulated tool life test method. For specific methods, see the description below. The larger the value of durable sharpness, the longer the life of initial sharpness and durable sharpness. The smaller the value of durable sharpness, the opposite is true.

The simulated tool life test method is as follows: the edge of the tool to be tested is fixed horizontally on the tool fixing device, and after passing through the additional weight, it is pressed on the simulant with a pressure of 16N. The cutting simulant (choose 3mm kraft cardboard) remains still, and the tool fixing device is driven by the motor and air pressure to drive the tool to cut in the direction of the X-axis at a speed of 50mm/s. At the same time, it rises in the direction of the Z-axis and displaces in the direction of the Y-axis. 1mm, the simulant is formed, the cutting stroke is 100mm, and it ends after cutting the simulant 5 times, and the evaluation object (ham sausage) is used to judge the lasting sharpness of the knife. The test is terminated until the evaluation object cannot be cut. Record the total number of cuts from the beginning to the end of the test, which is the durable sharpness of the tool. The more the total number of cuts, the higher the durable sharpness.

Table 1 The performance test data of the embodiment of the present application and comparative examples

In summary, it can be known from the above tests that the durable sharpness of the knife of the present application is significantly improved. At the same time, the service life is guaranteed by the toughness layer with relatively high toughness, and the sharpness is guaranteed by the hard layer with relatively high hardness. Combining multiple materials can obtain a durable sharp knife suitable for people. The knife prepared according to the present application can be sharp for a long time and is not prone to chipping or fracture.

Although the embodiments of the present application have been described in detail above, those skilled in the art can 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 eyes 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 (10)

1. A cutting tool, characterized in that the surface of the cutting edge part of the cutting tool is provided with a hard layer and a toughness layer which are 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 toughness layer is a base material for manufacturing the cutting tool, and the cutting edge part of the cutting tool has a micro-sawtooth structure along the length direction.

2. The tool according to claim 1, wherein adjacent hard and tough layers are connected to each other, the alternating hard and tough layers being arranged at equal intervals in the length direction.

3. The tool according to claim 1, wherein the length of each hard layer is 100 μm to 200 μm and the thickness of each hard layer is 0.1mm to 0.15mm.

4. A method of manufacturing a tool, characterized in that the method of manufacturing a tool comprises the steps of:

providing a cutter base body;

forming a hard layer and a tough layer alternately distributed in a longitudinal direction on a surface of a cutting edge portion of the tool base;

grinding the cutting edge part with the hard layer and the toughness layer along the thickness direction to obtain the cutter with the cutting edge part with the micro-sawtooth structure formed by the hard layer and the toughness layer which are alternately distributed in the length direction,

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 toughness layer is a base material for manufacturing the cutter base body.

5. The method of manufacturing a tool according to claim 4, wherein the step of forming the land portion having the surface having the hard layer and the tough layer alternately distributed in the length direction includes:

coating a metal ceramic composite material on the surface of the cutting edge part of the cutter base body, so that the cutting edge part of the cutter base body is provided with a hard layer which is continuously distributed along the length direction; and

polishing the continuously distributed hard layers along the width direction of the cutter base body so that the cutter base body positioned in the cutting edge part is exposed and divides the continuously distributed hard layers into a plurality of parts along the length direction, thereby forming a cutting edge part with the hard layers and the toughness layers alternately distributed in the length direction on the surface,

wherein the particle size of the metal ceramic composite material is 100nm-200nm.

6. The method of manufacturing a cutting tool according to claim 4, wherein the step of forming the land portion having the surface having the hard layer and the tough layer alternately distributed in the longitudinal direction includes:

and shielding the cutting edge part of the cutter base body by using a clamp, and coating a metal ceramic composite material on the surface of the non-shielded cutting edge part, thereby forming the cutting edge part with hard layers and tough layers alternately distributed in the length direction on the surface.

7. The method of claim 4, wherein the titanium carbide is 7-21 wt%, the titanium nitride is 7-21 wt%, the niobium carbide is 7-21 wt%, and the metal is 40-56 wt%, based on the total weight of the cermet composite material.

8. The method of manufacturing a cutting tool according to claim 4, wherein the metal comprises cobalt and nickel, wherein the weight ratio of the cobalt to the nickel is (1-2) to (2-6).

9. The method of claim 4, wherein the hard layer and the tough layer are the same length, and the hard layer has a thickness of 0.1mm to 0.15mm.

10. The method of manufacturing a tool according to claim 4, wherein the base material of which the tool base is made is carbon steel or stainless steel.

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