A durable and sharp household cutting knife and its manufacturing method

Abstract

The present disclosure relates to a household cutting knife with a long-lasting sharpness and a manufacturing method thereof. The household cutting knife comprises a blade body, the blade body comprises a jacket layer and a plurality of central cylinders embedded in the jacket layer. The material hardness and toughness of the central cylinders are greater than those of the jacket layer. The plurality of central cylinders are arranged at intervals along the length direction of the blade body. At least one end of the central cylinder protrudes from the jacket layer and has a cutting edge. The side of the jacket layer close to the cutting edge is a cutting edge. The cutting edge is recessed to a certain depth in the direction away from the cutting edge in the area between each two adjacent central cylinders to match the end of the central cylinder with a cutting edge, forming a continuous serrated blade at the edge of the blade body. The manufacturing method is used to manufacture the above-mentioned knife. The knife disclosed in the present disclosure has a good cutting effect, can keep the knife sharp in the blade thickness direction, and can also keep the knife with a serrated blade structure, thereby achieving a long-lasting sharp effect of the knife.

Description

Technical Field

[0001] The present disclosure relates to the technical field of household knives, and in particular to a durable and sharp household cutting knife and a manufacturing method thereof. Background Art

[0002] In the prior art, household cutting knives mostly adopt an integrated steel cold-rolled structure, and the blade is an integral steel plate. To meet the hardness requirements, the blade is usually made of a steel material with a higher hardness, which results in a high overall hardness of the blade, difficulty in grinding, and easy blunting.

[0003] A search revealed Chinese patent [CN 204819585U], which discloses a three-in-one, three-dimensional steel-clamped knife. The knife comprises a handle, a blade, and a blade. The blade is constructed from three layers of steel: a hard core steel layer and two outer layers of thick, low-hardness steel. The blade and blade are an integrated structure, tapering at the cutting edge. This knife boasts a tough, hard inner layer and an easily grinded outer layer. However, the core steel is a single-piece steel plate, and the blade is a straight-edged blade, resulting in poor cutting performance.

[0004] Further searching revealed Chinese patent [CN208358865U], which discloses a novel non-stick kitchen knife. The knife comprises a handle and a blade, which are integrally formed. Anti-slip pads are provided on both sides of the handle and fixed to the handle via rivets. The blade has a flat edge, with the upper end of the blade forming the back of the blade and the lower end forming the cutting edge. The patent further discloses that the blade edge can be serrated, effectively improving the cutting performance of the knife.

[0005] For knives with the aforementioned serrated blade structure, there are two main factors that affect their cutting performance. The first is the sharpness of the blade in the thickness direction of the blade body. This is the same as for ordinary knives and mainly affects the knife's performance when chopping perpendicular to the food. The sharpness can be improved by grinding to reduce the blade thickness. The second is the degree of wear of the serrated structure, which is usually manifested in the length of the serrated structure's protrusion. It mainly affects the knife's performance when sawing along the cut surface of the food. The cutting performance of the serrated blade gradually weakens as the degree of wear of the serrated structure increases. Generally, the degree of wear of the serrated structure is mainly related to the material used in the knife and the age of the knife. The harder the material used in the knife, the less susceptible the serrated structure is to wear. However, the harder the material used in the knife, the more difficult it is to grind in the thickness direction of the blade, which can cause the knife to blunt in the thickness direction. In other words, for knives with a serrated blade structure, how to make the serrated blade easy to grind in the thickness direction of the blade while maintaining its long-lasting effectiveness and preventing blunting is a technical problem that needs to be solved.

[0006] Although the above-mentioned patent scheme entitled "A Three-in-One Three-Dimensional Steel-Clamped Knife" discloses a sandwich structure with a core steel of high hardness in the middle and two outer layers of skin steel of low hardness, its core steel is an integrated steel plate structure and the blade is a straight-mouthed blade. The above-mentioned patent scheme entitled "A New Type of Non-stick Kitchen Knife" discloses a serrated blade edge structure, but it does not further disclose a technical solution for how to grind the serrated blade edge structure or keep it sharp for a long time. Therefore, there is no corresponding technical inspiration in the prior art. Summary of the Invention

[0007] To address the aforementioned problems of the prior art, the present invention aims to provide a household cutting knife that maintains a long-lasting sharpness and a method for manufacturing the same. The present invention utilizes a plurality of central columns arranged at intervals, with the ends of the central columns protruding beyond the jacket layer to form a serrated blade structure. Furthermore, the central columns are both harder and tougher than the jacket layer, resulting in a knife with excellent cutting performance. The varying degrees of wear of the central columns and jacket layer during use ensure that the knife maintains its sharpness along the thickness of the blade and maintains its serrated blade structure, thereby achieving a long-lasting sharpness.

[0008] The present invention discloses a durable and sharp household cutting knife, comprising a blade body, wherein the blade body comprises a jacket layer and a plurality of central cylinders embedded in the jacket layer, wherein the material hardness and toughness of the central cylinders are greater than those of the jacket layer, and the plurality of central cylinders are arranged at intervals along the length direction of the blade body, wherein at least one end of the central cylinder protrudes from the jacket layer and has a cutting edge, and a side of the jacket layer close to the cutting edge is a cutting edge surface, and the cutting edge surface is recessed to a certain depth in a direction away from the cutting edge in the area between each two adjacent central cylinders to cooperate with the end of the central cylinder having a cutting edge, thereby forming a continuous serrated blade at the edge of the blade body.

[0009] Preferably, the areas between each two adjacent central cylinders on both side surfaces of the blade body are recessed inwards to a certain depth, so that the side surfaces of the blade body present a continuous wavy surface structure.

[0010] Preferably, the central column is a cylinder.

[0011] Preferably, the central column is a quadrangular prism, and a connecting plate is provided between every two adjacent central columns. The two ends of the connecting plate are respectively connected to the two adjacent central columns, and several of the connecting plates are alternately arranged on both sides of the central column in the thickness direction of the blade, so that several of the central columns form a corrugated structure.

[0012] Preferably, the material hardness of the central column is greater than or equal to 62HRC, the material hardness of the jacket layer is less than or equal to 60HRC, and the material hardness of the central column is greater than the material hardness of the jacket layer.

[0013] Preferably, the household cutting knife further comprises a handle connected to the blade body, the blade body has an integrally formed connecting portion, and the handle is connected to the connecting portion.

[0014] The method for manufacturing a durable and sharp household cutting knife of this embodiment is used to manufacture the household cutting knife as described above, comprising the following steps:

[0015] Manufacturing a central column and a jacket layer, wherein the hardness and toughness of the material of the central column are greater than those of the jacket layer;

[0016] Embedding a plurality of the central columns in the jacket layer, and arranging the plurality of the central columns at intervals along the length direction of the blade, with at least one end of the central column protruding out of the jacket layer;

[0017] A blade surface is defined as a surface of the jacket layer adjacent to the protruding end of the central cylinder. The area of the blade surface between each two adjacent central cylinders is ground so that the area between each two adjacent central cylinders is recessed inwardly by a certain depth. The protruding end of the central cylinder and the blade surface are sharpened to obtain a blade having a continuous serrated edge.

[0018] The durable and sharp household cutting knife is produced by manufacturing the blade body.

[0019] Preferably, the blade body is made to obtain the durable and sharp household cutting knife as follows:

[0020] The knife handle is made and connected with the blade to obtain the durable and sharp household cutting knife.

[0021] The advantages of the durable and sharp household cutting knife and the manufacturing method thereof disclosed in the present invention are:

[0022] 1. The present invention provides a plurality of center columns arranged at intervals along the length direction of the blade, so that the center columns are embedded in the jacket layer, and the ends of the center columns protrude outside the jacket layer to form a cutting edge, and the blade surface of the jacket layer is grinded in the area between two adjacent center columns to make it concave to a certain depth inward to form a continuous serrated blade at the edge of the blade, thereby improving the cutting effect of the tool. Furthermore, since the hardness and toughness of the center column are greater than those of the jacket layer, when the tool is in use, the center column will be more resistant to wear than the jacket layer, that is, under the same usage scenario, the wear amount of the center column will always be less than the wear amount of the jacket layer, thereby ensuring that the center column and the jacket layer are always kept in the thickness direction of the blade. On the other hand, the blade-holding structure, due to the structure of the central columns arranged at intervals and the grinding of the jacket layer between the two adjacent central columns, the serrated blade structure formed will also be affected by the hardness and toughness of the different materials of the central column and the jacket layer during use, so that under the same usage scenario, the wear of the protruding central column structure is always less than the wear of the jacket layer blade surface, that is, the central column can always be kept protruding from the jacket layer, so that the edge of the blade can always maintain a continuous serrated structure, so that the tool can ensure the long-lasting and effective serrated blade structure while also ensuring the blade structure of the tool in the direction of the blade thickness, keeping the tool long-lastingly sharp, reducing the grinding frequency, and making it easier to use. In addition, since the jacket layer can be made of a material with lower hardness, the material cost of the tool can be reduced;

[0023] 2. The present invention makes the side surfaces of the blade recessed to a certain depth inward in the area between every two adjacent central cylinders, so that the side surfaces of the blade present a continuous wavy surface structure. This wavy surface structure can reduce the situation where flaky food sticks to the blade surface when the knife is cutting fruits, meat and other food, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the household cutting tool of this embodiment;

[0025] Figure 2 is a sectional view of a horizontal cross section of the blade of Example 1;

[0026] Figure 3 is a side partial cross-sectional view of the blade position of Example 1;

[0027] Figure 4 is a partial front cross-sectional view of the blade position of Example 1;

[0028] Figure 5 is a cross-sectional view of a horizontal cross section of the blade having a continuous wavy surface structure according to Example 1;

[0029] Figure 6 It is a sectional view of a horizontal cross section of the blade of Example 2.

[0030] Description of the accompanying drawings: 1-blade body, 11-jacket layer, 12-center column, 13-connecting plate, 2-handle. DETAILED DESCRIPTION

[0031] like Figures 1-4 As shown, the disclosed long-lasting sharp household cutting knife comprises a blade body 1, wherein the blade body 1 comprises a jacket layer 11 and a plurality of central columns 12 embedded in the jacket layer 11. The jacket layer 11 can be formed in one piece or by splicing two plywood sheets. Figure 1 Taking the direction shown as an example, the lower edge of the jacket layer 11 extends upward to form a plurality of embedding holes adapted to the central column 12, and the plurality of embedding holes are arranged along the length direction of the blade 1, that is, Figure 1 As shown in the left and right directions, a plurality of central columns 12 are arranged one by one in the embedding holes, and the lower ends are exposed outside the jacket layer 11. Usually, the lower ends of the central columns 12 are slightly exposed outside the jacket layer 11, and the lower ends of the central columns 12 and the jacket layer 11 are sharpened to form Figure 3 The cutting edge shown.

[0032] The side of the jacket layer 11 close to the cutting edge is defined as the blade face, and the area of the blade face between every two adjacent central cylinders 12 is recessed to a certain depth in the direction away from the cutting edge. Specifically, the cross-section of the protruding end of the central cylinder 12 in the front view direction can be semicircular or triangular, and the shape of the recessed area of the blade face is usually adapted to the protruding end of the central cylinder 12 to form a continuous serrated blade at the edge of the blade body 1. The protruding part of the continuous serrated blade is composed of the central cylinder 12 with higher hardness and toughness, and the recessed part is composed of the jacket layer 11 with lower hardness and toughness. As a result, the degree of wear of the protruding part during use is always lower than that of the recessed part, so that the blade position can maintain a continuous serrated structure.

[0033] Furthermore, in this embodiment, the details are as follows Figure 5 As shown, the two side surfaces of the blade 1 are recessed inwardly to a certain depth in the area between each two adjacent central cylinders 12, so that the side surfaces of the blade 1 present a continuous wavy surface structure. With this structure, when slicing fruits, meat or other food, the recessed portion between the two protruding portions does not come into contact with the flaky food, thereby reducing the contact area between the side surfaces of the blade 1 and the flaky food, thereby reducing the situation where the flaky food sticks to the blade surface, making it more convenient to use.

[0034] Example 1

[0035] like Figure 2 As shown, the central column 12 is a cylinder, and the cylindrical structure can be easily processed and prepared.

[0036] Example 2

[0037] like Figure 6 As shown, the central column 12 is specifically a quadrangular prism, with a connecting plate 13 disposed between each two adjacent central columns 12. The connecting plate 13 is disposed parallel to the front surface of the blade 1, with each end of the connecting plate 13 connecting two adjacent central columns 12. Multiple central columns 12 are sequentially connected via the connecting plates 13 to form an integrated structure, which stabilizes the overall structure of the central columns 12 and enhances the overall rigidity of the tool. More specifically, the connecting plates 13 and the multiple central columns 12 can be manufactured using a one-time forging process.

[0038] Furthermore, a plurality of connecting plates 13 are alternately arranged on both sides of the central column 12 in the thickness direction of the blade 1, so that the plurality of central columns 12 form a corrugated structure. The connecting plates 13 are alternately distributed, so that the connecting plates 13 can be evenly distributed on both sides of the thickness direction of the blade 1, so that the overall quality of the blade 1 is uniform and the structure is stable.

[0039] The above two implementation methods of different shapes of the center column 12 can both achieve the effect of long-lasting sharpness of the tool. The cylindrical center column 12 is easy to process and prepare, which can reduce processing costs. The quadrangular prism-shaped center column 12 with a connecting plate 13 structure can improve the overall performance of the tool and can be selected and set according to actual needs. The shape of the center column 12 is not limited to the above-mentioned cylinder and quadrangular prism, and other commonly used column shapes can also be used.

[0040] Furthermore, in this embodiment, in addition to being formed by integral casting, the jacket layer 11 may also be formed as a split composite structure. Specifically, the jacket layer 11 includes a first plywood and a second plywood, each of which is cast separately. The first plywood and the second plywood are respectively disposed on either side of the central column 12 in the thickness direction of the blade 1. The first plywood is connected to the second plywood, and both the first plywood and the second plywood are connected to the central column 12, so that the three plywoods constitute the blade 1 structure. Specifically, the first plywood and the second plywood are symmetrical structures, disposed on either side of the central column 12, and the three plywoods are compositely formed by hot pressing in a high-temperature and high-pressure environment to form the blade 1 structure. The split structure can reduce the difficulty of casting.

[0041] Furthermore, in this embodiment, the blade of the blade body 1 is a straight blade or a curved blade. The blade body 1 structure of this embodiment can be applied to existing straight blade knives or existing curved blade knives. It is only necessary to design the length of the central column 12 to adapt it to the width of the blade body 1 at different positions.

[0042] Furthermore, in this embodiment, the material hardness of the central column 12 is greater than or equal to 62HRC, such as it can be made of 14Cr14MoVNb powder steel material, and the material hardness of the jacket layer 11 is less than or equal to 60HRC, such as it can be made of SUS410 stainless steel material, so that the material hardness and toughness of the jacket layer 11 are slightly lower than those of the central column 12.

[0043] Furthermore, in this embodiment, the household cutting knife also includes a handle 2 connected to the blade body 1. The handle 2 can be made of conventional materials such as metal or wood. The blade body 1 has an integrally formed connecting portion, and the handle 2 is connected to the connecting portion so that the blade body 1 and the handle 2 are firmly connected and not easy to break.

[0044] This embodiment also provides a method for manufacturing a durable and sharp household cutting knife, which is used to manufacture the household cutting knife as described above, comprising the following steps:

[0045] The central column 12 and the jacket layer 11 are manufactured. The hardness and toughness of the material of the central column 12 are greater than those of the jacket layer 11. Specifically, the central column 12 and the jacket layer 11 can be manufactured by casting;

[0046] Embedding a plurality of the central columns 12 in the jacket layer 11 and arranging the plurality of the central columns 12 at intervals along the length direction of the blade 1 , with at least one end of the central column 12 protruding from the jacket layer 11 ;

[0047] A surface of the jacket layer 11 close to the protruding end of the central cylinder 12 is defined as a blade surface. The area of the blade surface between each two adjacent central cylinders 12 is polished so that the area between each two adjacent central cylinders 12 is recessed inwardly by a certain depth. The protruding end of the central cylinder 12 and the blade surface are sharpened to obtain a blade body 1 having a continuous serrated blade.

[0048] The handle 2 is manufactured and connected to the blade body 1 to obtain the durable and sharp household cutting knife.

[0049] The manufacturing method of this embodiment belongs to the same technical solution as the above-mentioned household cutting knife, which can be understood by referring to the above description and will not be repeated here.

[0050] The present invention provides a plurality of center columns 12 arranged at intervals along the length direction of the blade 1, so that the center columns 12 are embedded in the jacket layer 11, and the end of the center column 12 protrudes outside the jacket layer 11 to form a cutting edge, and the blade surface of the jacket layer 11 is grinded in the area between two adjacent center columns 12, so that it is recessed to a certain depth inward to form a continuous serrated blade at the edge of the blade 1, which can improve the cutting effect of the tool. Furthermore, since the hardness and toughness of the center column 12 are greater than those of the jacket layer 11, when the tool is in use, the center column 12 will be more wear-resistant than the jacket layer 11, that is, under the same usage scenario, the wear amount of the center column 12 will always be less than the wear amount of the jacket layer 11, thereby making the center column 12 and the jacket layer 11 in the thickness of the blade 1. On the other hand, due to the structure of the center cylinders 12 arranged at intervals and the grinding of the jacket layer 11 between the two adjacent center cylinders 12, the serrated blade structure formed will also be affected by the different hardness and toughness of the center cylinder 12 and the jacket layer 11 during use, so that under the same usage scenario, the wear amount of the protruding center cylinder 12 structure is always less than the wear amount of the jacket layer 11 blade surface, that is, the center cylinder 12 can always be kept protruding from the jacket layer 11, so that the edge of the blade 1 can always maintain a continuous serrated structure, so that the tool can ensure the blade structure of the tool in the blade thickness direction while ensuring the long-lasting and effective serrated blade structure, keep the tool sharp for a long time, reduce the grinding frequency, and be more convenient to use. In addition, since the jacket layer 11 can be made of a material with lower hardness, the material cost of the tool can be reduced.

[0051] In the description of the present disclosure, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present disclosure.

[0052] Those skilled in the art can make various other corresponding changes and deformations based on the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of this disclosure.

Claims

1. A long-lasting and sharp household cutting knife, characterized in that: The present invention comprises a blade body, wherein the blade body comprises a jacket layer and a plurality of central cylinders embedded in the jacket layer, the material hardness and toughness of the central cylinders are greater than those of the jacket layer, and the plurality of central cylinders are arranged at intervals along the length direction of the blade body, at least one end of the central cylinder protrudes from the jacket layer and has a cutting edge, and a side of the jacket layer close to the cutting edge is a cutting edge surface, and the cutting edge surface is recessed to a certain depth in the direction away from the cutting edge in the area between each two adjacent central cylinders to cooperate with the end of the central cylinder with a cutting edge, thereby forming a continuous serrated blade at the edge of the blade body.

2. The long-lasting sharp household cutting knife according to claim 1, characterized in that: The areas between each two adjacent central cylinders on both side surfaces of the blade body are recessed inwards to a certain depth, so that the side surfaces of the blade body present a continuous wavy surface structure.

3. The durable and sharp household cutting knife according to claim 1, characterized in that: The central column is a cylinder.

4. The durable and sharp household cutting knife according to claim 1, characterized in that: The central column is a quadrangular prism, and a connecting plate is provided between every two adjacent central columns. The two ends of the connecting plate are respectively connected to the two adjacent central columns, and several connecting plates are alternately arranged on both sides of the central column in the thickness direction of the blade, so that several of the central columns form a corrugated structure.

5. The long-lasting sharp household cutting knife according to claim 1, characterized in that: The jacket layer includes a first plywood and a second plywood, the first plywood and the second plywood are respectively arranged on both sides of the central column in the thickness direction of the blade, the first plywood is connected to the second plywood, and the first plywood and the second plywood are both connected to the central column.

6. The long-lasting sharp household cutting knife according to claim 1, characterized in that: The blade of the blade body is a straight blade or an arc-shaped blade.

7. The long-lasting sharp household cutting knife according to claim 1, characterized in that: The material hardness of the central column is greater than or equal to 62HRC, the material hardness of the jacket layer is less than or equal to 60HRC, and the material hardness of the central column is greater than the material hardness of the jacket layer.

8. The long-lasting sharp household cutting knife according to claim 1, characterized in that: It also includes a knife handle connected to the knife body, the knife body has an integrally formed connecting portion, and the knife handle is connected to the connecting portion.

9. A method for manufacturing a durable and sharp household cutting knife, for manufacturing the household cutting knife according to any one of claims 1 to 8, characterized in that: The following steps are involved: Manufacturing a central column and a jacket layer, wherein the hardness and toughness of the material of the central column are greater than those of the jacket layer; Embedding a plurality of the central columns in the jacket layer, and arranging the plurality of the central columns at intervals along the length direction of the blade, with at least one end of the central column protruding out of the jacket layer; A blade surface is defined as a surface of the jacket layer adjacent to the protruding end of the central cylinder. The area of the blade surface between each two adjacent central cylinders is ground so that the area between each two adjacent central cylinders is recessed inwardly by a certain depth. The protruding end of the central cylinder and the blade surface are sharpened to obtain a blade having a continuous serrated edge. The durable and sharp household cutting knife is produced by manufacturing the blade body.

10. The method for making a durable and sharp household cutting knife according to claim 9, characterized in that: The blade body is used to produce the durable and sharp household cutting knife, specifically: The knife handle is made and connected with the blade to obtain the durable and sharp household cutting knife.

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