Self-sharpening kitchen knife, recycled material breaking knife, cutting tool and method of manufacture

Abstract

The application discloses a self-sharpening kitchen knife, a regenerated material crushing knife, a cutter and a preparation method, an outer side section of a first side of a blade base is provided with a thin-layer alloy reinforcing part through laser additive, the thin-layer alloy reinforcing part is embedded into the blade base; the thin-layer alloy reinforcing part and the blade base form a composite blade; the hardness of the thin-layer alloy reinforcing part is greater than the hardness of the blade base; the thin-layer alloy reinforcing part extends to a blade edge; the thin-layer alloy reinforcing part has better layer combination, is not easy to crack and separate, has higher strength, the hardness of the thin-layer alloy reinforcing part is greater than the hardness of the blade base, so that the wear resistance of a blade A surface is better than that of a blade B surface; during cutting operation, the blade B surface is first worn due to the lower hardness, so that a front edge of the thin-layer alloy reinforcing part protrudes, and then the cutter can keep relatively sharp cutting performance for a long time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tool sharpening, in particular to a self-sharpening tool and a preparation method thereof, which solves the problem of tool dulling during use, and the sharpened tool has the performance of self-sharpening during use, achieving the effect of becoming sharper with use. BACKGROUND

[0002] During use, the cutting edge of the tool will be worn and notched due to friction and collision, which will cause the R angle of the cutting edge to increase, resulting in tool dulling and affecting cutting efficiency. When the sharpness of the tool decreases, the tool needs to be sharpened or replaced, which is time-consuming and laborious and seriously affects work efficiency.

[0003] The opening method of the cutting edge of the tool includes single opening and double opening. For example, Chinese and French self-sharpening kitchen knives are generally double-opening structures, and the two sides of the opening are inwardly inclined at a sharp acute angle and have an inclined angle with the blade. For example, Japanese sushi knives are single-opening structures, and only one side of the opening is inwardly inclined, while the other side of the blade is consistent and not processed.

[0004] The breaking blade of the renewable resource material shredder is also a single-opening structure. The target objects shredded by the renewable resource material shredder include wood, tires, plastics, films, circuit boards, and various industrial raw material garbage in different industries. The renewable resource material shredder is large in size and high in unit price, and the breaking blade is not convenient to disassemble and assemble frequently in terms of size and weight, and accounts for about 20% of the cost of the entire machine itself, which is a high-cost consumable. Whether grinding or replacing will cause a large loss of manpower and material resources.

[0005] In the prior art, there are mainly several ways to sharpen the tool:

[0006] First, the base body is improved by using more wear-resistant materials, such as increasing the content of elements such as C, Cr, Mo, V, and Co in steel. However, this method increases the hardness while reducing the toughness of the tool. Therefore, a clamping steel method is used, that is, two relatively soft steels are clamped with a relatively hard steel in the middle, to effectively avoid the problem of reducing the overall toughness.

[0007] Second, the cutting edge surface is provided with a reinforcing layer, including a cladding layer. Patent application with publication number CN110218998A discloses a method for preparing a self-sharpening cutter based on laser cladding treatment of the surface of the cutting edge of the cutter. A self-fluxing alloy powder is used as raw material, and a cladding layer is formed on one side of the cutting edge of the pretreated cutter by laser cladding process. The wear degree of the two surfaces of the cutting edge is different, so that the cutting edge becomes sharper with wear, achieving the effect of self-sharpening, greatly improving the service life of the cutter. Patent application with publication number CN115216765A discloses a method for preparing a high-hardness wear-resistant coating layer for a farm machine blade by laser cladding. On the first machining surface, 2 layers of cladding layer are printed by multi-pass additive printing to form a triangular structure first coating structure with thickness gradient variation; the blade stack is turned over by 90°, and the second machining surface is upward as the cladding surface; on the second machining surface, 1 layer of cladding layer is printed by multi-pass additive printing to form a triangular structure second coating structure with thickness gradient variation.

[0008] However, the first method is only a temporary solution and cannot fundamentally solve the problem. Even the most wear-resistant material will eventually become dull, and the more difficult it is to sharpen the blade, the more trouble it will cause for the user. In the second method, the cladding layer is easily detached from the substrate due to poor bonding performance, and more importantly, the cladding layer changes the profile of the cutting edge, affecting the cutting ability of the cutter. SUMMARY

[0009] In view of the defects in the prior art, especially the easy detachment of the cladding layer and the change of the cutting edge profile, the present application provides a cutter cutting edge strengthening scheme that maintains the cutting edge profile, has high bonding strength and better strengthening effect, thereby providing a self-sharpening cutter, improving the hardness and wear resistance of the cutting edge, relying on the difference in wear resistance of the materials to form a wear height difference, so that the more wear-resistant part lags behind the less wear-resistant part, thereby achieving self-sharpening. Based on this, a self-sharpening kitchen knife and a self-sharpening regenerative material crushing knife are provided. And by means of laser additive manufacturing, a method for preparing such self-sharpening cutters is provided.

[0010] The technical scheme adopted by the present application to solve the above technical problems is that the self-sharpening kitchen knife comprises a cutter base body, the cutter base body comprises a body part and a blade base part;

[0011] The outer side segment of the first side of the blade base part is provided with a thin-layer alloy reinforcing part, and the thin-layer alloy reinforcing part is embedded into the blade base part;

[0012] The thin-layer alloy reinforcing part is formed by attaching a reinforcing additive base material to the initial blade base part, melting into the molten pool after laser beam scanning, and alloying with the base material of the initial blade base part;

[0013] The thin-layer alloy strengthening part comprises a plurality of strip-shaped bands formed by laser beam scanning and arranged in parallel and lap joint, the strip-shaped bands are arranged at 10-90 degrees with the cutting edge, and the cutting edge is micro-sawtooth-shaped concave-convex due to the parallel strip-shaped bands;

[0014] The HRC value of the thin-layer alloy strengthening part is greater than the HRC value of the blade base part, and the difference between the two is greater than 2HRC;

[0015] The thin-layer alloy strengthening part and the blade base part jointly form a composite cutting edge with a gradually decreasing thickness from the inside to the outside;

[0016] The outer surface of the thin-layer alloy strengthening part is substantially flush with the outer surface of the first side inner side section of the blade base part to jointly form a blade A surface of the composite cutting edge;

[0017] The outer surface of the second side of the blade base part comprises an inwardly inclined cutting surface on the outer side section, and the outer surface of the second side of the blade base part is a blade B surface of the composite cutting edge;

[0018] The blade A surface and the blade B surface intersect at the outer edge to form a cutting edge, the thin-layer alloy strengthening part extends to the cutting edge, and the thickness of the thin-layer alloy strengthening part is less than 5 microns.

[0019] The preferred technical solution adopted by the present application to solve the above technical problems is that the composite cutting edge is a double-sided cutting edge;

[0020] The body part comprises a knife A surface and a knife B surface opposite in thickness direction;

[0021] The blade A surface is inclined inwardly from the knife A surface, and the blade B surface is inclined inwardly from the knife B surface.

[0022] The preferred technical solution adopted by the present application to solve the above technical problems is that the composite cutting edge is a single-sided cutting edge;

[0023] The body part comprises a knife A surface and a knife B surface opposite in thickness direction;

[0024] The knife A surface and the blade A surface are located in the same plane, and the knife B surface and the blade B surface form an obtuse angle.

[0025] The preferred technical solution adopted by the present application to solve the above technical problems is that the width of the thin-layer alloy strengthening part is 1-20 mm.

[0026] The preferred technical solution adopted by the present application to solve the above technical problems is that the strengthening additive base material comprises one or more of carbon powder, silicon powder, boron powder, carbide, nitride, boride and oxide.

[0027] The technical scheme adopted by the present application to solve the above technical problems is: a self-sharpening kitchen knife, comprising a knife base body, wherein the knife base body comprises a body part and a blade base part;

[0028] An outer side segment of the first side of the blade base part is provided with a thin-layer alloy reinforcing part embedded into the blade base part;

[0029] The hardness of the thin-layer alloy reinforcing part is greater than the hardness of the blade base part;

[0030] The thin-layer alloy reinforcing part and the blade base part jointly form a composite blade edge with a gradually decreasing thickness from inside to outside;

[0031] The outer surface of the thin-layer alloy reinforcing part is substantially flush with the outer surface of the inner side segment of the first side of the blade base part, so as to jointly form a blade A surface of the composite blade edge;

[0032] The outer surface of the second side of the blade base part comprises an inwardly inclined blade opening surface located at the outer side segment, and the outer surface of the second side of the blade base part is a blade B surface of the composite blade edge;

[0033] The blade A surface and the blade B surface intersect at an outer edge to form a blade edge, the thin-layer alloy reinforcing part extends to the blade edge, and the thickness of the thin-layer alloy reinforcing part is less than 5 μm.

[0034] The preferred technical scheme adopted by the present application to solve the above technical problems is that the width of the thin-layer alloy reinforcing part ranges from 3 mm to 5 mm.

[0035] The preferred technical scheme adopted by the present application to solve the above technical problems is that the HRC value of the thin-layer alloy reinforcing part is greater than the HRC value of the blade base part, and the difference between the two is greater than 2HRC.

[0036] The preferred technical scheme adopted by the present application to solve the above technical problems is that the body part comprises a knife A surface and a knife B surface opposite in thickness direction, and the knife A surface and the knife B surface are substantially parallel; the blade A surface is inwardly inclined from the knife A surface, and the blade B surface is inwardly inclined from the knife B surface.

[0037] The preferred technical scheme adopted by the present application to solve the above technical problems is that the body part comprises a knife A surface and a knife B surface opposite in thickness direction, and the knife A surface and the blade A surface are located in the same plane, and the knife B surface and the blade B surface form an obtuse angle.

[0038] The preferred technical scheme adopted by the present application to solve the above technical problems is that the thin-layer alloy reinforcing part is formed by a reinforcing additive base material attached to an initial blade base part, melted into a molten pool after laser beam scanning, and alloyed with the base material of the initial blade base part; and the reinforcing additive base material comprises carbon powder or the reinforcing additive base material comprises a cermet composite.

[0039] The preferred technical solution adopted by the present application to solve the above technical problems is that the cutting edge is in a micro-sawtooth concave-convex shape.

[0040] The technical solution adopted by the present application to solve the above technical problems is that the self-sharpening blade type regenerated material crushing knife comprises a knife base body, the knife base body comprises a body part and a blade base part;

[0041] The outer side section of the first side of the blade base part is provided with a thin-layer alloy reinforcement part embedded into the blade base part;

[0042] The hardness of the thin-layer alloy reinforcement part is greater than the hardness of the blade base part;

[0043] The thin-layer alloy reinforcement part and the blade base part jointly form a composite cutting edge with a gradually decreasing thickness from inside to outside;

[0044] The outer surface of the thin-layer alloy reinforcement part is substantially flush with the outer surface of the inner side section of the first side of the blade base part to jointly form a blade A surface of the composite cutting edge;

[0045] The outer surface of the second side of the blade base part comprises an inwardly inclined opening blade surface on the outer side section, and the outer surface of the second side of the blade base part is a blade B surface of the composite cutting edge;

[0046] The body part comprises opposite knife A and B surfaces in the thickness direction, the knife A surface and the blade A surface are located in the same plane, and the knife B surface forms an obtuse angle with the blade B surface;

[0047] The blade A surface intersects with the blade B surface to form a cutting edge at the outer edge, the thin-layer alloy reinforcement part extends to the cutting edge, and the thickness of the thin-layer alloy reinforcement part ranges from less than 0.2mm.

[0048] The preferred technical solution adopted by the present application to solve the above technical problems is that the thin-layer alloy reinforcement part is formed by a reinforcement additive base attached to an initial blade base part, melted into a molten pool after laser beam scanning, and alloyed with the base material of the initial blade base part.

[0049] The preferred technical solution adopted by the present application to solve the above technical problems is that the thin-layer alloy reinforcement part comprises a plurality of strip-shaped bands arranged in parallel and lap joint due to laser beam scanning, the strip-shaped bands are arranged at an angle of 10-90 degrees with the cutting edge, and the cutting edge is in a micro-sawtooth concave-convex shape due to the parallel strip-shaped bands.

[0050] The preferred technical solution adopted by the present application to solve the above technical problems is that the reinforcement additive base comprises one or more of carbon powder, silicon powder, boron powder, carbide, nitride, boride, and oxide.

[0051] The technical scheme adopted by the present application to solve the above technical problems is: a self-sharpening cutter, comprising a cutter base body, characterized in that the cutter base body comprises a blade base part;

[0052] An outer side section of a first side of the blade base part is provided with a thin-layer alloy reinforcing part embedded into the blade base part; the thin-layer alloy reinforcing part and the blade base part form a composite cutting edge;

[0053] The thin-layer alloy reinforcing part has a hardness greater than that of the blade base part;

[0054] An outer surface of the thin-layer alloy reinforcing part and an outer surface of an inner side section of the first side of the blade base part form a blade A surface of the composite cutting edge;

[0055] An outer surface of a second side of the blade base part comprises an inwardly inclined opening blade surface of an outer side section, and the outer surface of the second side of the blade base part is a blade B surface of the composite cutting edge;

[0056] The blade A surface and the blade B surface intersect to form a cutting edge at an outer edge, and the thin-layer alloy reinforcing part extends to the cutting edge.

[0057] The preferred technical scheme adopted by the present application to solve the above technical problems is that the thin-layer alloy reinforcing part is formed by a reinforcing additive base material attached to an initial blade base part, fused into a molten pool by laser beam scanning, and alloyed with the base material of the initial blade base part.

[0058] The preferred technical scheme adopted by the present application to solve the above technical problems is that the HRC value of the thin-layer alloy reinforcing part is greater than the HRC value of the blade base part, and the difference between the two is greater than 2HRC.

[0059] The preferred technical scheme adopted by the present application to solve the above technical problems is that the thin-layer alloy reinforcing part comprises a plurality of strip-shaped bands arranged in parallel and lap joint to form a micro-sawtooth concave-convex structure, and the strip-shaped bands are arranged at an angle of 10-90 degrees with the cutting edge.

[0060] The preferred technical scheme adopted by the present application to solve the above technical problems is that the cutter base body comprises a body part;

[0061] The body part comprises a tool A surface and a tool B surface opposite in thickness direction;

[0062] The blade A surface is inclined inwardly from the tool A surface, and the blade B surface is inclined inwardly from the tool B surface.

[0063] The preferred technical scheme adopted by the present application to solve the above technical problems is that the cutter base body comprises a body part;

[0064] The body part comprises a tool A surface and a tool B surface opposite in thickness direction;

[0065] The tool A face and the blade A face are located in the same plane, and the tool B face and the blade B face form an obtuse angle.

[0066] The preferred technical solution adopted by the present application to solve the above technical problems is that the thickness of the thin-layer alloy strengthening part is less than 5 μm.

[0067] The preferred technical solution adopted by the present application to solve the above technical problems is that the thickness of the thin-layer alloy strengthening part is less than 0.5 mm.

[0068] The preferred technical solution adopted by the present application to solve the above technical problems is that the strengthening additive base material comprises one or more of carbon powder, silicon powder, boron powder, carbide, nitride, boride, and oxide.

[0069] The technical solution adopted by the present application to solve the above technical problems is a preparation method of a self-sharpening tool, comprising the following steps:

[0070] Step A: preparing a tool blank and performing pretreatment, one side of the tool blank being an initial blade base;

[0071] Step B: spraying a strengthening additive base material on the outer side section of the first side of the treated initial blade base;

[0072] Step C: scanning the surface of the first side of the initial blade base covered with the strengthening additive base material by a laser beam;

[0073] The first side of the initial blade base forms a molten pool, the strengthening additive base material is melted into the molten pool and is alloyed with the base material of the initial blade base to form a thin-layer alloy strengthening part melted into the first side of the initial blade base;

[0074] Step D: treating the surface of the second side of the initial blade base, the outer surface of the second side forming an inwardly inclined opening blade surface; a composite tool blade with a gradually decreasing thickness from inside to outside is formed; the composite tool blade comprises the thin-layer alloy strengthening part and a blade base obtained by treating the initial blade base; the thin-layer alloy strengthening part extends to the tool edge and intersects with the opening blade surface of the blade base at an acute angle to form a blade edge at the outer edge.

[0075] The preferred technical solution adopted by the present application to solve the above technical problems is that the preparation method comprises the following steps in sequence:

[0076] Step A: preparing a tool blank and performing pretreatment, one side of the tool blank being an initial blade base;

[0077] Grinding the first side of the initial blade base to form a first single-sided blade surface gradually inclined inwardly toward the outer edge;

[0078] Step B: uniformly spraying the strengthening additive base on the outer side section of the first single-sided blade surface;

[0079] The strengthening additive base forms a strip-shaped thin-layered adhesive area with a certain width and thickness on the first single-sided blade surface;

[0080] Step C: the laser beam scans the strip-shaped thin-layered adhesive area row by row with a certain overlap rate to simultaneously act on the strengthening additive base and the initial blade base;

[0081] During the laser beam scanning process, the initial blade base forms a molten pool, the strengthening additive base enters the molten pool and is alloyed with the base material of the initial blade base to form a thin-layered alloyed strengthening part;

[0082] Step D: grinding the surface of the second side of the initial blade base to form a second single-sided blade surface symmetrical to the first single-sided blade surface, the second single-sided blade surface includes an outermost opening blade surface; the thin-layered alloyed strengthening part extends to the outer edge of the tool and intersects with the opening blade surface at an acute angle to form a blade edge.

[0083] The preferred technical solution adopted by the present application to solve the above technical problems is that the first single-sided blade surface in step A includes a first inclined surface and a second inclined surface connected in sequence, the slope of the outer first inclined surface is greater than the slope of the inner second inclined surface;

[0084] Correspondingly, the second single-sided blade surface in step D includes a third inclined surface symmetrical to the first inclined surface and a fourth inclined surface symmetrical to the second inclined surface, the third inclined surface is an opening blade surface, and the included angle between the third inclined surface and the outer surface of the thin-layered alloyed strengthening part is an opening blade angle.

[0085] The preferred technical solution adopted by the present application to solve the above technical problems is that the width of the thin-layered alloyed strengthening part is 3-10 mm, the material thickness of the strip-shaped thin-layered adhesive area is 0.01-0.05 mm, and the thickness of the thin-layered alloyed strengthening part is less than 5 μm;

[0086] Or the width of the thin-layered alloyed strengthening part is 5-50 mm, the material thickness of the strip-shaped thin-layered adhesive area is 0.1-0.2 mm, and the thickness of the thin-layered alloyed strengthening part is less than 0.5 mm;

[0087] The preferred technical solution adopted by the present application to solve the above technical problems is that the steps include the following steps in sequence:

[0088] Step A: preparing a tool blank and performing pretreatment, one side of the tool blank being an initial blade base;

[0089] Step B: uniformly spraying the strengthening additive base on the outer side section of the first side of the initial blade base;

[0090] The reinforcing additive material forms a strip-shaped thin-layer adhesion area with a certain width and thickness on the first side of the initial blade base;

[0091] Step C: a laser beam scans the strip-shaped thin-layer adhesion area line by line at a certain overlap rate to simultaneously act on the reinforcing additive material and the initial blade base;

[0092] During the scanning of the laser beam, the initial blade base forms a molten pool, the reinforcing additive material enters the molten pool and is alloyed with the base material of the initial blade base to form a thin-layer alloy reinforcing part;

[0093] Step D: grinding the second side of the initial blade base to form an open blade surface; the thin-layer alloy reinforcing part extends to the outer edge of the tool and intersects with the open blade surface at an acute angle to form a blade edge.

[0094] The preferred technical solution adopted by the present application to solve the above technical problems comprises the following steps in sequence:

[0095] Step A: preparing a tool blank and performing pretreatment, one side of the tool blank being an initial blade base;

[0096] Grinding the second side of the initial blade base to form a single-sided blade surface that gradually inclines inward toward the outer edge;

[0097] Step B: uniformly spraying a reinforcing additive material on the outer side section of the first side of the unground initial blade base;

[0098] The reinforcing additive material forms a strip-shaped thin-layer adhesion area with a certain width and thickness on the first side of the initial blade base;

[0099] Step C: a laser beam scans the strip-shaped thin-layer adhesion area line by line at a certain overlap rate to simultaneously act on the reinforcing additive material and the initial blade base;

[0100] During the scanning of the laser beam, the initial blade base forms a molten pool, the reinforcing additive material enters the molten pool and is alloyed with the base material of the initial blade base to form a thin-layer alloy reinforcing part;

[0101] Step D: grinding the second side of the initial blade base to form an open blade surface; the thin-layer alloy reinforcing part extends to the outer edge of the tool and intersects with the open blade surface at an acute angle to form a blade edge.

[0102] The preferred technical solution adopted by the present application to solve the above technical problems comprises the following steps in sequence:

[0103] The preferred technical solution adopted by the present application to solve the above technical problems is that an optimization step F is further included before step D, and the optimization step F includes adjusting and controlling the deformation amount of the pressure applied to the tool after the previous step.

[0104] The preferred technical solution adopted by the present application to solve the above technical problems is that the scanning direction of the laser beam in step C is perpendicular to the outer edge of the initial blade base or forms a certain angle with the outer edge of the initial blade base; and step C is performed under the protection of a nitrogen or argon or carbon dioxide atmosphere.

[0105] The laser beam scans the strip-shaped thin layer adhesion area row by row with a lap rate of 0-50% to form strip-shaped bands that lap each other on the surface of the thin layer-shaped alloy strengthening part.

[0106] The preferred technical solution adopted by the present application to solve the above technical problems is that the spot of the laser beam in step C is circular or square, and the spot diameter is less than 200 μm.

[0107] Compared with the prior art, the present application has at least the following advantages:

[0108] First, the thin layer-shaped alloy strengthening part is not a coating structure attached to the surface of the blade base, but a metallurgical bonding structure "embedded" in the blade base and integrated with the blade base. It does not increase the thickness of the blade and does not change the profile of the blade.

[0109] Second, the thin layer-shaped alloy strengthening part is formed by the strengthening additive base attached to the initial blade base, melted into the molten pool after laser beam scanning, and alloyed with the base material of the initial blade base. Therefore, unlike the ordinary laser cladding process, it has better layer bonding, avoids the poor bonding between the cladding layer and the base material of the blade base that may occur in the laser cladding process, and avoids the problem of cracking and falling off.

[0110] Third, the hardness of the thin layer-shaped alloy strengthening part is greater than that of the blade base, so that the wear resistance of the blade A surface is better than that of the blade B surface. During cutting operation, the blade B surface is first worn out due to its lower hardness, so that the leading edge of the thin layer-shaped alloy strengthening part protrudes, and the tool can maintain a relatively sharp cutting performance for a long time.

[0111] Fourth, the thin layer-shaped alloy strengthening part includes a plurality of parallel and lapped strip-shaped bands caused by the laser beam scanning row by row with a certain lap rate, so that the thin layer-shaped alloy strengthening part has a micro-sawtooth concave-convex structure, the strip-shaped bands are arranged at an angle of 10-90° with the blade edge, so that the longitudinal section of the blade edge has a micro-sawtooth concave-convex structure, the thin layer-shaped alloy strengthening part exposed at the blade edge position has a micro-sawtooth concave-convex structure, and the blade edge of the tool has a micro-sawtooth structure, thereby having better cutting performance. BRIEF DESCRIPTION OF DRAWINGS

[0112] The present application will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are for illustrative purposes only and thus should not be taken as limiting the scope of the present application. In addition, unless specifically stated otherwise, the drawings are not drawn to scale and thus can contain exaggerated or distorted representations of the components or configurations described.

[0113] Figure 1 A use state schematic view of the self-sharpening kitchen knife in Embodiment One;

[0114] Figure 2 A structure schematic view of the self-sharpening kitchen knife in Embodiment One;

[0115] Figure 3 A structure schematic view of the composite blade of the self-sharpening kitchen knife in Embodiment One;

[0116] Figure 4 A schematic view of Step A1 of preparing the self-sharpening kitchen knife in Embodiment One;

[0117] Figure 5 A schematic view of Step A2 of preparing the self-sharpening kitchen knife in Embodiment One;

[0118] Figure 6 A schematic view of Step B of preparing the self-sharpening kitchen knife in Embodiment One;

[0119] Figure 7 A schematic view of Step C of preparing the self-sharpening kitchen knife in Embodiment One;

[0120] Figure 8 A schematic view of Step C of preparing the self-sharpening kitchen knife in Embodiment One after completion;

[0121] Figure 9 A schematic view of Step D of preparing the self-sharpening kitchen knife in Embodiment One;

[0122] Figure 10 A use state schematic view of the self-sharpening kitchen knife in Embodiment Two;

[0123] Figure 11 A structure schematic view of the self-sharpening kitchen knife in Embodiment Two;

[0124] Figure 12 A partial structure schematic view of the self-sharpening kitchen knife in Embodiment Two;

[0125] Figure 13 A structure schematic view of the composite blade of the self-sharpening kitchen knife in Embodiment Two;

[0126] Figure 14 schematic view of step A for making a self-sharpening kitchen knife in Example Two;

[0127] Figure 15 schematic view of step B for making a self-sharpening kitchen knife in Example Two;

[0128] Figure 16 schematic view of step C for making a self-sharpening kitchen knife in Example Two;

[0129] Figure 17 schematic view of step C for making a self-sharpening kitchen knife in Example Two after completion of step C;

[0130] Figure 18 schematic view of step D for making a self-sharpening kitchen knife in Example Two;

[0131] Figure 19 schematic view of a self-sharpening recycled material shredder knife in Example Three;

[0132] Figure 20 schematic view of step A for making a self-sharpening recycled material shredder knife in Example Three;

[0133] Figure 21 schematic view of step B for making a self-sharpening recycled material shredder knife in Example Three;

[0134] Figure 22 schematic view of step C for making a self-sharpening recycled material shredder knife in Example Three;

[0135] Figure 23 schematic view of step C for making a self-sharpening recycled material shredder knife in Example Three after completion of step C;

[0136] Figure 24 schematic view of step D for making a self-sharpening recycled material shredder knife in Example Three. DETAILED DESCRIPTION

[0137] Preferred embodiments of the present application will be described in detail below with reference to the attached drawings. Those skilled in the art will appreciate that the description herein is by way of example only and is not to be construed in any way to limit the scope of the present application.

[0138] It should be noted that like reference numerals in the various figures indicate similar items, and that, unless otherwise specified, definitions in the cited references should be construed to apply equally to the present application.

[0139] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention. Example

[0140] like Figures 1-2 As shown, this embodiment provides a self-sharpening kitchen knife P1 and its specific manufacturing method. The kitchen knife is a self-sharpening knife, including a blade body 100 and a handle 200. The blade body 100 includes a metallic blade base 10 and a thin-layered alloy reinforcing portion 20 composite on the blade base 10.

[0141] Specifically, such as Figure 2 As shown, the blade base 10 includes a body portion 101 and a blade base portion 102. The body portion 101 refers to the back and front of the blade, while the blade base portion 102 refers to the portion on one side used for sharpening. The body portion 101 and the blade base portion 102 are generally formed from a single piece of metal.

[0142] like Figures 2-3 As shown, the blade base 102 includes two opposite sides in the thickness direction: a first side S1 and a second side S2. A thin-layered alloy reinforcing portion 20 is disposed on the first side S1 of the blade base 102 and is located on the outer side of the blade base 102. The thin-layered alloy reinforcing portion 20 and the blade base 102 form a composite blade M. The hardness of the thin-layered alloy reinforcing portion 20 is greater than the hardness of the blade base 102. The term "outer side" refers to the side of the blade base 102 away from the outer edge of the body portion 101, and the term "outer side segment" refers to a small area extending from the outer edge of the blade base 102 toward the body portion 101.

[0143] like Figures 2-3 As shown, the thin-layer alloy reinforcement 20 is not a coating structure attached to the surface of the blade base 102, but rather "embedded" into the blade base 102, forming a metallurgical bond with it. Atomic diffusion occurs between the thin-layer alloy reinforcement 20 and the blade base 102 at their interface. The term "embedded" means that a virtual "groove" is formed on the first side S1 of the blade base 102, and the thin-layer alloy reinforcement 20 is located within this "groove," rather than being raised and laid on the surface of the blade base 102 as in a coating structure.

[0144] Based on the above, the outer surface H1 of the thin-layer alloy reinforced portion 20 and the outer surface H2 of the inner side section of the first side S1 of the blade base 102 jointly form a blade A surface 3 of the composite blade M; the outer surface of the second side S2 of the blade base 102 includes an inwardly inclined cutting edge surface of the outer side section, and the outer surface of the second side S2 of the blade base 102 is a blade B surface 4 of the composite blade M. The blade A surface 3 intersects the blade B surface 4 to form a blade edge V at the outer edge, and the thin-layer alloy reinforced portion 20 extends to the blade edge V.

[0145] Since the hardness of the thin-layer alloy reinforced portion 20 is greater than the hardness of the blade base 102, the wear degrees of the two blade surfaces, the blade A surface 3 and the blade B surface 4, are different during the operation of the knife body 100, which makes the wear ratio between the two blade surfaces different, thereby forming a self-sharpening effect.

[0146] According to the prior art, the cross section of the blade edge V of a kitchen knife that is sharpened before leaving the factory is generally a long strip-shaped micro-arc surface structure with a radius ranging from 1 to 2 μm. In the application scenario of cutting food, the blade edge V gradually wears. Through experiments, it is found that when the radius of the blade edge V is within 5 μm, it still maintains a sharp state, and when the radius of the blade edge V reaches 8 μm, the kitchen knife is obviously blunt and difficult to adapt to cutting operations.

[0147] In the embodiment, the thickness of the thin-layer alloy reinforced portion 20 is less than 5 μm. That is, during the cutting operation, the blade B surface 4 is first worn due to the lower hardness, so that the leading edge of the thin-layer alloy reinforced portion 20 protrudes, and the thickness of the thin-layer alloy reinforced portion 20 is less than 5 μm, so that the radius of the blade edge V after wear is always less than 5 μm, thereby enabling the kitchen knife to maintain relatively sharp cutting performance for a long time.

[0148] In the embodiment, the HRC value of the thin-layer alloy reinforced portion 20 is greater than the HRC value of the blade base 102, and the difference between the two is greater than 2HRC. Such a hardness difference forms a hardness gradient change, which has a better self-sharpening effect.

[0149] In the embodiment, the thin-layer alloy reinforced portion 20 is formed by the reinforced additive base 300 attached to the initial blade base 102C, melted into the molten pool after scanning by the laser beam, and alloyed with the base material of the initial blade base 102C. Therefore, unlike the ordinary laser cladding process, it has better layer bonding, avoiding the poor bonding between the cladding layer and the base material of the blade base 102 that may occur in the laser cladding process, and the problem of easy cracking and falling.

[0150] More importantly, the cladding layer protrudes from the surface of the machined cutting edge base 102, affecting the profile design of the cutting edge and making its cutting performance uncontrollable. In this embodiment, the reinforcing additive matrix 300 is melted into the molten pool, so that the thin-layer alloy reinforcing part 20 is "embedded" in the cutting edge base 102. The outer surface of the thin-layer alloy reinforcing part 20 away from the cutting edge base 102 is roughly flush with the outer surface of the inner section of the cutting edge base 102, basically maintaining the profile of the cutting edge formed according to the design, and maintaining the stability and consistency of the cutting performance of the cutting edge.

[0151] More preferably, such as Figure 8 As shown, the thin-layer alloy reinforcement 20 includes multiple parallel overlapping strips J to give the thin-layer alloy reinforcement 20 a micro-serrated uneven structure. The strips J are set at an angle of 10~90° to the cutting edge V. The strips J are formed by the laser beam scanning line by line with a certain overlap rate.

[0152] Because the strip J is set at an angle of 10~90°, the longitudinal section of the blade has a micro-serrated uneven structure on one side, which in turn makes the thin layer of alloy reinforcement 20 exposed at the edge V have a micro-serrated uneven structure. Therefore, the edge V of this self-sharpening kitchen knife has a micro-serrated shape and better cutting performance.

[0153] It should be understood that general machining is difficult to form micro-serrated concave and convex structures, and excessively large serrated concave and convex structures are not suitable for cutting delicate ingredients. However, this embodiment breaks through the technical bottleneck in the field of tool processing and realizes a V-shaped micro-serrated cutting edge.

[0154] In this embodiment, as Figure 3 As shown, the body portion 101 includes a blade A surface 1 and a blade B surface 2 facing each other in the thickness direction; the blade A surface 1 and the blade B surface 2 can be approximately parallel, the cutting edge A surface 3 is inclined inward from the blade A surface 1, and the cutting edge B surface 4 is inclined inward from the blade B surface 2. The longitudinal section of the cutting edge base portion 102 is a pointed-angle structure that is approximately symmetrical along a virtual central axis. The thin-layered alloy reinforcement portion 20 is located on one side of the pointed-angle structure, and its width is relatively short, occupying only a short distance of the outer section.

[0155] Viewed from the front of the blade body 100, the thin-layered alloy reinforcing portion 20 exhibits a narrow strip-like structure on one surface. Preferably, the width of the thin-layered alloy reinforcing portion 20 is 3 to 10 mm. It should be understood that the technical objective can be achieved simply by using a thin-layered alloy reinforcing portion 20 with a very small width.

[0156] Preferably, the base material of the knife body 10 can be 2Cr13, 9Cr18Mo, etc., so that its hardness and toughness meet the requirements of kitchen knife cutting scenarios.

[0157] Preferably, the thickness of the body part 101 is in the range of 1-5 mm. The composite cutting edge M presents a gradient variation of composition in the longitudinal section, first the blade base 102 occupies the bulk of the thickness, so that the whole tool retains the characteristics conferred by the matrix of the tool base 10, while the composition of the thin-layered alloy strengthening part 20, which is less than 5 μm in thickness, is not homogeneous either, and should be said that it also includes a portion metallurgically combined with the matrix. The thin-layered alloy strengthening part 20 not only contributes to the self-sharpening of the tool, but also itself is an enhancement of the strength of the tool.

[0158] The present embodiment also specifically provides a specific preparation method of the self-sharpening blade kitchen knife, which is a specific self-sharpening tool.

[0159] Step A: as shown in the figure, a tool blank Y is prepared and pretreated, and one side of the tool blank is an initial blade base 102C. Figures 4-5

[0160] Step B: as shown in the figure, the strengthening additive base 300 is sprayed on the outer side segment of the first side L1 of the pretreated initial blade base 102C. The strengthening additive base 300 forms a strip-shaped thin-layered adhesive area with a certain width and thickness on the first single-sided blade surface. Figures 5-6

[0161] Step C: as shown in the figure (the arrow indicates the laser scanning direction), the laser beam T scans the surface of the first side of the initial blade base 102C covered by the strengthening additive base 300; the first side of the initial blade base 102C forms a molten pool, and the strengthening additive base 300 is melted into the molten pool and alloyed with the matrix of the initial blade base 102C to form a thin-layered alloy strengthening part 20 melted into the first side of the initial blade base 102C, forming a structure as shown in the figure. Figures 6-7 Figure 8

[0162] Step D: as shown in the figure, the surface of the second side L2 of the initial blade base 102C is treated, and the outer surface of the second side forms an inwardly inclined opening blade surface 13; a composite cutting edge M is formed, which includes the thin-layered alloy strengthening part 20 and the blade base 102 obtained by treating the initial blade base 102C; the thin-layered alloy strengthening part 20 extends to the edge of the tool and intersects the opening blade surface of the blade base 102 at an acute angle to form a cutting edge V at the outer edge. Figure 9 In the present embodiment, preferably, step A includes the following sub-steps:

[0163] Step A1: as shown in the figure, the steel material is cut by a machine to obtain a tool blank Y of a kitchen knife.

[0164] Figure 4 Step A2: as shown in the figure, the tool blank Y is pretreated.

[0165] Step A3: as shown in the figure, the tool blank Y is heated to a temperature of 800-900°C. Figure 5 ​​​​​As shown, the kitchen knife blank is passed through a grinding machine to process the side requiring the blade to form an initial blade base 102C, specifically referring to grinding the first side L1 of the tool blank to form a first single-sided blade surface gradually inclined towards the outer edge. In addition, the first single-sided blade surface is generally surface treated.

[0166] For Figure 2 As shown, the kitchen knife blade structure. As Figure 5 As shown, in step A2, the first side L1 of the tool blank needs to be ground with a large opening and a small opening, that is, to form two inclined surface structures with different slopes. The outer first inclined surface 11 has a larger slope, and the width is generally less than 1mm. The inner second inclined surface 12 has a smaller slope, and the width is larger than the first inclined surface 11.

[0167] In this embodiment, the reinforcing additive base 300 exists in the form of slurry, which improves the uniformity of the composition and the adhesion of the reinforcing additive base 300 to the initial blade base 102C. Accordingly, the reinforcing additive base 300 slurry needs to be prepared before step B. This pre-step specifically includes the following steps:

[0168] Step B1: According to the requirements, the reinforcing additive base 300 powder is prepared and mixed, ground and stirred.

[0169] Step B2: Using the mixed powder obtained in step B1, the reinforcing additive base 300 slurry is prepared by mixing and stirring with water, emulsifier and other ingredients.

[0170] It should be noted that the composition of the reinforcing additive base 300 is not limited, which can be pure carbon powder, or a mixture including carbon powder, silicon powder and boron powder, and can further include carbide, nitride, boride, oxide and other ceramic powder.

[0171] In this embodiment, the reinforcing additive base 300 powder is a metal ceramic composite material. The pre-step is specifically embodied as the following steps:

[0172] Step B1: Take 20 parts by weight of zirconium niobium carbide solid solution powder with a purity of 95.5%, 8 parts by weight of silicon carbide solid solution powder with a purity of 96%, 10 parts by weight of aluminum oxide powder with a purity of 97.5%, 15 parts by weight of nickel powder with a purity of 96.5%, 13 parts by weight of iron powder with a purity of 95.5% and 19 parts by weight of manganese powder with a purity of 94.5% in a ball mill at a speed of 350 rpm for 2h to obtain the reinforcing additive base 300 powder of the metal ceramic composite material.

[0173] Step B2: Take 20 parts by weight of the cermet composite material prepared in step B1, 120 parts by weight of alcohol with a purity of 99%, 20 parts by weight of shellac, 80 parts by weight of tap water, and stir in a container, the stirring time is 1 h, to obtain the strengthening additive base 300 slurry.

[0174] In the strengthening additive base 300 provided in the embodiment, the metal substances such as iron powder and manganese powder improve the metallurgical bonding ability of the strengthening additive base 300 and the base material of the blade base 10, and further improve the stability of the structure. Carbide and silicon carbide contribute to the improvement of hardness. And the interlocking enhancement effect of oxide and carbide relieves the structure strain, thereby enhancing the structural stability of the thin-layer alloy strengthening part 20.

[0175] In step B, preferably, the thickness of the strengthening additive base 300, that is, the thickness of the strip-shaped thin layer attachment area, is 0.01-0.05 mm. The thickness of the laid strengthening additive base 300 is also an important parameter affecting the final thickness of the thin-layer alloy strengthening part 20. The thickness of the strengthening additive base 300 in the embodiment is 0.01-0.05 mm, which is based on the preferred value obtained by repeated experiments.

[0176] In step C, the spot of the laser beam can be circular or square, and the diameter or side length of the spot is less than 200 μm.

[0177] In step C, the scanning direction of the laser beam is perpendicular to the outer edge of the initial blade base 102C or at a certain inclination angle with the outer edge of the initial blade base 102C, and the inclination angle is 10-90°. As shown in Figure 8 The laser beam scans the strip-shaped thin layer attachment area row by row with a lap rate of 0-50%, so as to simultaneously act on the strengthening additive base 300 and the initial blade base 102C; during the scanning process of the laser beam, the initial blade base 102C forms a molten pool, the strengthening additive base 300 enters the molten pool and is alloyed with the base material of the initial blade base 102C to form the thin-layer alloy strengthening part 20, so that the surface of the thin-layer alloy strengthening part 20 forms strip-shaped bands J that lap each other, and the blade edge V is micro-sawtooth concave-convex due to the juxtaposed strip-shaped bands J. The lap rate is the ratio of the area of the next row covering the previous row to the area of the next row when the laser scans row by row. The whole step C processing process is protected by nitrogen or argon or carbon dioxide atmosphere.

[0178] The diameter or side length of the spot of the laser beam in step C is related to at least two key points: first, the thickness of the thin-layer alloy strengthening part 20; second, the size of the strip-shaped band J and the micro-sawtooth concave-convex. It should be noted that the laser power is inversely related to the speed, and in the embodiment, the laser power is 500-3000 W, and the scanning speed is 1-10 m / s. The laser can be continuous laser or pulsed laser.

[0179] After step C, the outer surface of the thin-layered alloy reinforced part 20 is formed into the cutting edge A surface 3. The outer surface of the thin-layered alloy reinforced part 20 is approximately flush with the outer surface of the first inner side section of the cutting edge base part 102.

[0180] like Figure 9 As shown, step D specifically involves using a grinding machine to perform large-scale and small-scale grinding on the second side of the initial cutting edge base 102C of the blade body 100, which has already been reinforced with a thin-layered alloy 20. This forms a third and fourth inclined surface 14, which are symmetrical to the first and second inclined surfaces 11 and 12, thereby forming a composite cutting edge M with a thickness that gradually decreases from the inside to the outside. The third inclined surface is the cutting surface of the composite cutting edge M.

[0181] The initial cutting edge base 102C is finally processed into the cutting edge base 102, and the second side S2 surface of the cutting edge base 102 forms the cutting edge B surface 4. The cutting edge A surface 3 and the cutting edge B surface 4 intersect, and the thin layered alloy reinforcement 20 extends to the edge of the tool. The outer surface of a portion of the thin layered alloy reinforcement 20 on the first inclined surface intersects the cutting surface of the cutting edge base 102 at an acute angle to form a cutting edge V at the outer edge.

[0182] Step D can be further broken down into the following sub-steps:

[0183] Step D1: Grind the second side of the initial cutting edge base 102C with a grinding machine to achieve a large cutting edge.

[0184] Step D2: Place the tool body 100, which has been ground in step D1, into a rubber wheel grinder for double-sided rubber grinding.

[0185] Step D3: After grinding with a rubber wheel, the blade body 100 is sharpened on the second side to form a third bevel, thus forming a second single-sided cutting surface symmetrical to the first single-sided cutting surface. The second single-sided cutting surface includes the outermost sharpened surface, i.e., the third bevel, and the sharpening angle can be 25 degrees.

[0186] Preferably, in the self-sharpening kitchen knife prepared in this embodiment, the hardness of the first side of the composite blade M, namely the thin-layer alloy reinforcement part 20, is HRC62~HRC66, and the hardness of the second side of the composite blade M, namely the base material of the blade base 102, is HRC55, thereby forming a hardness gradient difference, which provides a prerequisite for achieving self-sharpening. Example

[0187] like Figures 10-11 As shown, this embodiment provides a self-sharpening kitchen knife P2' and its specific manufacturing method. The kitchen knife is a self-sharpening knife, including a blade body 100' and a handle 200'. The blade body 100' includes a metallic blade base 10' and a thin-layered alloy reinforcing portion 20' composite on the blade base 10'. Specifically, the blade base 10' includes a body portion 101' and a blade base portion 102'.

[0188] As Figures 10-12 shown, the blade base 102' includes two opposite sides in the thickness direction: a first side S1' and a second side S2'. The thin-layer alloy strengthening part 20' is arranged on the first side S1' of the blade base 102' and located at the outer side section of the blade base 102'. The thin-layer alloy strengthening part 20' forms a composite blade M' with the blade base 102'. The thin-layer alloy strengthening part 20' has a higher hardness than the blade base 102'. The outer side refers to the side away from the outer edge of the body part 101', and the outer side section refers to a small area extending from the outer edge of the blade base 102' towards the body part 101'.

[0189] As Figures 11-13 shown, the thin-layer alloy strengthening part 20' is not a coating structure attached to the surface of the blade base 102', but a "embedded" metallurgical bonding structure integrated with the blade base 102'. Atomic diffusion occurs at the interface between the thin-layer alloy strengthening part 20' and the blade base 102'. The "embedded" structure refers to the first side S1' of the blade base 102' forming a virtual "groove", and the thin-layer alloy strengthening part 20' is located in the "groove", rather than being raised on the surface of the blade base 102' as in a coating structure.

[0190] As Figures 12-13 shown, the outer surface H1' of the thin-layer alloy strengthening part 20' and the outer surface of the inner side section H2' of the first side of the blade base 102' form the blade A face 3' of the composite blade M'; the outer surface of the second side S2' of the blade base 102' includes an inwardly inclined cutting face 13' at the outer side section, and the outer surface of the second side S2' of the blade base 102' is the blade B face 4' of the composite blade M'. The blade A face 3' intersects the blade B face 4' to form a blade edge V' at the outer edge, and the thin-layer alloy strengthening part 20' extends to the blade edge V'.

[0191] Unlike the first embodiment, the body part 101' includes opposite blade A face 1' and blade B face 2', which are substantially parallel; the blade A face 1' and the blade A face 3' are in the same plane, and the blade B face 2' forms an obtuse angle with the blade B face 4'. More specifically, this embodiment provides a kitchen knife with a single-sided blade, such as a Japanese sushi knife.

[0192] Because the thin-layer alloy strengthening part 20' has a higher hardness than the blade base 102', the blade A face 3' and the blade B face 4' have different degrees of wear during the operation of the knife body 100', which results in different wear ratios between the two blade faces and forms a self-sharpening effect.

[0193] According to the prior art, the blade edge V' of the kitchen knife delivered from the factory is generally a long strip-shaped micro-arc surface structure with a radius range of 1-2 μm. In the application scenario of cutting food, the blade edge V' gradually wears out. Through experiments, it is found that when the radius range of the blade edge V' is within 5 μm, the blade edge remains sharp, and when the radius range of the blade edge V' reaches 8 μm, the kitchen knife is obviously blunt and difficult to adapt to the cutting operation.

[0194] In the present embodiment, the thickness of the thin-layered alloy strengthening part 20' is less than 5 μm. That is, during the cutting operation, the blade B surface 4' is first worn out due to the lower hardness, so that the front edge of the thin-layered alloy strengthening part 20' protrudes, and the thickness of the thin-layered alloy strengthening part 20' is less than 5 μm, so that the radius of the blade edge V' after wear is always less than 5 μm, and the kitchen knife can maintain a relatively sharp cutting performance for a long time.

[0195] In the present embodiment, the HRC value of the thin-layered alloy strengthening part 20' is greater than the HRC value of the blade base 102', and the difference between the two is greater than 2HRC. Such a hardness difference forms a hardness gradient change, which has a better self-sharpening effect.

[0196] In the present embodiment, the thin-layered alloy strengthening part 20' is formed by the strengthening additive base material 300' attached to the initial blade base 102C', which is melted into the molten pool after laser beam scanning and alloyed with the base material of the initial blade base 102C'. Therefore, unlike the ordinary laser cladding process, it has better layer bonding, avoiding the problem of poor bonding between the cladding layer and the base material of the blade base 102' that may occur in the laser cladding process, which is prone to cracking and falling off.

[0197] More importantly, the cladding layer protrudes from the surface of the blade base 102' formed by processing, affecting the profile design of the cutting edge, so that the cutting performance of the cutting edge is not controlled. In the present embodiment, the strengthening additive base material 300' is melted into the molten pool, so that the thin-layered alloy strengthening part 20' is "embedded" in the blade base 102', and the outer surface of the thin-layered alloy strengthening part 20' away from the blade base 102' is substantially flush with the outer surface of the inner side section of the blade base 102', substantially maintaining the profile of the cutting edge formed according to the design processing, and maintaining the stability and consistency of the cutting performance of the cutting edge.

[0198] Further preferably, the thin-layered alloy strengthening part 20' includes a plurality of strip-shaped strips J' arranged in parallel and overlapping to form a micro-sawtooth concave-convex structure, and the strip-shaped strips J' are arranged at an angle of 10-90° with respect to the blade edge V'. The strip-shaped strips J' are caused by the laser beam scanning in a certain overlap rate.

[0199] Because the strip-shaped band J' is arranged at 10-90°, the longitudinal cutting surface of the blade is micro-sawtooth concave-convex, and the thin-layer alloy strengthening part 20' exposed to the position of the blade edge V' is also micro-sawtooth concave-convex, so that the blade edge V' of the self-sharpening kitchen knife is micro-sawtooth, and has better cutting performance.

[0200] It should be understood that general mechanical processing is difficult to form a micro-sawtooth concave-convex structure, and a too large sawtooth concave-convex structure is not suitable for cutting of fine food materials, and the embodiment breaks through the technical bottleneck in the field of tool processing, and realizes the micro-sawtooth of the blade edge V'.

[0201] From the front of the tool body 100', the thin-layer alloy strengthening part 20' is in a relatively narrow strip-shaped structure on one surface. Preferably, the width of the thin-layer alloy strengthening part 20' is 3-10 mm. It should be understood that only a thin-layer alloy strengthening part 20' with a very small width is needed to achieve the technical purpose.

[0202] As shown in the figure, preferably, the base material of the tool base body 10' can be 2Cr13, 9Cr18Mo, etc., so that the hardness and toughness of the tool base body 10' itself meet the requirements of the kitchen knife cutting scene.

[0203] Preferably, the thickness of the body part 101' is 1-5 mm. The composite blade M' is in a composition gradient change structure in the longitudinal section. First, the blade base 102' occupies the main part of the thickness, so that the tool as a whole retains the characteristics of the base material of the tool base body 10', and the composition of the thin-layer alloy strengthening part 20' with a thickness of less than 5 μm is also not homogeneous. It should be said that it also includes a part metallurgically combined with the base material. The thin-layer alloy strengthening part 20' not only contributes to the self-sharpening of the tool, but also enhances the strength of the tool itself. Preferably, the thickness of the thin-layer alloy strengthening part 20' is 3-5 μm.

[0204] Because the tool in the embodiment is a single-side blade structure, the preparation method is also slightly different.

[0205] The embodiment provides a specific preparation method of the self-sharpening kitchen knife.

[0206] Step A: as shown in the figure, a tool blank Y' is prepared and pretreated, and one side of the tool blank Y' is an initial blade base 102C'. In the embodiment, after the steel material is cut by a machine to obtain the tool blank Y' of the kitchen knife, the initial blade base 102C' of the tool blank Y' does not need to be ground, and only the surface is treated. Figure 14 Step B: as shown in the figure, the strengthening additive base 300' is sprayed on the outer side segment of the first side L1' of the treated initial blade base 102C'.

[0207] Figure 15 Step C: as shown in the figure, the thin-layer alloy strengthening part 20' is formed on the treated initial blade base 102C' by a laser deposition method.​

[0208] In the present embodiment, the reinforcing additive base 300' is in the form of a slurry, which improves the uniformity of the components and the adhesion of the reinforcing additive base 300' to the initial blade base 102C'. Accordingly, the reinforcing additive base 300' slurry needs to be prepared before step B. The preparatory step specifically includes the following steps:

[0209] Step B1: The reinforcing additive base 300' powder is prepared according to the requirements and mixed, ground and stirred.

[0210] Step B2: The mixed powder obtained in step B1 is used to prepare the reinforcing additive base 300' slurry by mixing and stirring with water, emulsifiers and other components.

[0211] It should be noted that the components of the reinforcing additive base 300' are not limited to pure carbon powder, but can also be a mixture including carbon powder, silicon powder and boron powder, and can further include carbide, nitride, boride, oxide and other ceramic powders.

[0212] In the present embodiment, the reinforcing additive base 300' powder is a metal ceramic composite material. The preparatory step is specifically embodied as the following steps:

[0213] Step B1: Take 20 parts by weight of zirconium niobium carbide complex carbide solid solution powder with a purity of 95.5%, 8 parts by weight of silicon carbide solid solution powder with a purity of 96%, 10 parts by weight of aluminum oxide powder with a purity of 97.5%, 15 parts by weight of nickel powder with a purity of 96.5%, 13 parts by weight of iron powder with a purity of 95.5% and 19 parts by weight of manganese powder with a purity of 94.5% in a ball mill at a speed of 350 rpm for 2 h to obtain the reinforcing additive base 300' powder of the metal ceramic composite material.

[0214] Step B2: Take 20 parts by weight of the metal ceramic composite material prepared in step B1, 120 parts by weight of alcohol with a purity of 99%, 20 parts by weight of shellac and 80 parts of tap water in a container and stir for 1 h to obtain the reinforcing additive base 300' slurry.

[0215] In the reinforcing additive base 300' provided in the present embodiment, the metal substances such as iron powder and manganese powder improve the metallurgical bonding ability of the reinforcing additive base 300' to the base material of the blade base 10', further improving the structural stability. Carbide and silicon carbide contribute to the improvement of hardness. And there is an interlocking enhancement effect between oxide and carbide, which relieves the structural strain, thereby enhancing the structural stability of the thin-layer alloy reinforcing part 20'.

[0216] In step B, preferably, the thickness of the reinforcing additive material 300' is 0.01-0.05mm. The thickness of the reinforcing additive material 300' is also an important parameter affecting the final thickness of the thin-layered alloy reinforcing portion 20'. The thickness of the reinforcing additive material 300' in the present embodiment is 0.01-0.05mm, which is based on the preferred value obtained from repeated experiments.

[0217] Step C: As shown in Figure 16 , the laser beam T' scans the surface of the first side L1' of the initial blade base 102C' covered by the reinforcing additive material 300'; the first side L1' of the initial blade base 102C' forms a molten pool, and the reinforcing additive material 300' melts into the molten pool and is alloyed with the base material of the initial blade base 102C' to form a thin-layered alloy reinforcing portion 20' melted into the first side of the initial blade base 102C', as shown in Figure 17 . Steps C and D are consistent with the first embodiment, and are not further elaborated here. The outer surface of the thin-layered alloy reinforcing portion 20' is approximately flush with the outer surface of the first side inner section of the blade base 102', forming the blade A face 3'.

[0218] As shown in Figures 16-17 , the spot of the laser beam in step C can be circular or square, and the diameter or side length of the spot is less than 200' μm. The diameter or side length of the spot is related to at least two key points: first, the thickness of the thin-layered alloy reinforcing portion 20'; second, the size of the strip-shaped bands J' and the micro-sawtooth-shaped concave-convex. It should be noted that the laser power is inversely related to the speed, and in the present embodiment, the laser power is 500-3000W, and the scanning speed is 1-10m / s. The laser can be continuous or pulsed.

[0219] As shown in Figure 17 , the scanning direction of the laser beam in step C is perpendicular to the outer edge of the initial blade base 102C' or at an inclination angle of 10-90° to the outer edge of the initial blade base 102C'. The laser beam scans the strip-shaped thin-layered attachment area row by row with a lap rate of 0-50%, so as to simultaneously act on the reinforcing additive material 300' and the initial blade base 102C'; during the scanning process of the laser beam, the initial blade base 102C' forms a molten pool, the reinforcing additive material 300' enters the molten pool and is alloyed with the base material of the initial blade base 102C' to form a thin-layered alloy reinforcing portion 20', so that the surface of the thin-layered alloy reinforcing portion 20' forms strip-shaped bands J' overlapping each other, and the blade edge V' is micro-sawtooth-shaped concave-convex due to the juxtaposed strip-shaped bands J'. The lap rate is the ratio of the area of the next row covering the previous row to the area of the next row when the laser scans row by row. The entire step C is carried out in a nitrogen or argon or carbon dioxide atmosphere.

[0220] Step D: As shown in Figure 18As shown, the surface of the second side L2' of the initial blade base 102C' is processed, and the second side of the initial blade base 102C' is ground to form a single-sided blade surface that gradually slopes inward from the outer edge, thereby forming a composite blade M' whose thickness gradually decreases from the inside to the outside.

[0221] Step D specifically involves using a grinding machine to perform large-scale and small-scale grinding on the second side of the initial cutting edge base 102C', which has already been reinforced with a thin-layered alloy 20'. After small-scale grinding, an outer cutting edge 13' is formed. The initial cutting edge base 102C' is finally processed into the cutting edge base 102', thereby forming a composite cutting edge M' with a thickness that gradually decreases from the inside to the outside. The second side of the cutting edge base 102' forms a cutting edge B surface 4'. The cutting edge A surface 3' and the cutting edge B surface 4' intersect, and the thin-layered alloy reinforced part 20' extends to the edge of the tool. The outer surface of the portion of the thin-layered alloy reinforced part 20' on the cutting edge 13' intersects the cutting edge 13' of the cutting edge base 102' at an acute angle to form a cutting edge V' at the outer edge.

[0222] As in Example 1, in step D, before performing small-sharpening, the tool body 100' can also be placed in a rubber wheel grinder for double-sided rubber grinding.

[0223] Preferably, in the self-sharpening kitchen knife prepared in this embodiment, the hardness of the first side of the composite blade M', namely the thin-layered alloy reinforcement part 20', is HRC62~HRC66, and the hardness of the base material of the second side of the composite blade M', namely the blade base 102', is HRC55, thereby forming a hardness gradient difference, which provides a prerequisite for achieving self-sharpening.

[0224] Example 3

[0225] like Figure 19 , 24 As shown, this embodiment provides a self-sharpening recycled material crusher P3'' and its specific preparation method. The recycled material crusher is a self-sharpening tool, and its blade body 100'' includes a metallic blade base 10'' and a thin-layered alloy reinforcing part 20'' composite on the blade base 10''.

[0226] Specifically, such as Figure 24 As shown, the blade base 10'' includes a body portion 101'' and a blade base portion 102''. The body portion refers to the back and front of the blade, while the blade base portion 102'' refers to the portion on one side used for sharpening. The body portion and the blade base portion 102'' are generally formed from a single piece of metal.

[0227] The preferred material for the blade base 10'' is steel of grades such as 6CrW2Si, 42CrMo, SKD-11, D2, DC53, LD, and Cr12Mo.

[0228] likeFigure 24 As shown, the blade base 102'' includes two opposite sides in the thickness direction: a first side S1'' and a second side S2''. The thin-layer alloy strengthening part 20'' is arranged on the first side S1'' of the blade base 102'' and located at the outer side section of the blade base 102''. The thin-layer alloy strengthening part 20'' forms a composite blade M'' with the blade base 102''. The thin-layer alloy strengthening part 20'' has a hardness greater than that of the blade base 102''. The outer side refers to the side of the blade base 102'' away from the outer edge of the body part 101'', and the outer side section refers to a small area extending from the outer edge of the blade base 102'' towards the body part 101''.

[0229] The thin-layer alloy strengthening part 20'' is not a coating structure attached to the surface of the blade base 102'', but a “embedded” metallurgical bonding structure integrated with the blade base 102''. Atomic diffusion occurs at the interface between the thin-layer alloy strengthening part 20'' and the blade base 102''. The “embedded” structure refers to the first side S1'' of the blade base 102'' forming a virtual “groove”, and the thin-layer alloy strengthening part 20'' is located in the “groove”, rather than being raised and laid on the surface of the blade base 102'' as in a coating structure.

[0230] Based on the above, the outer surface of the thin-layer alloy strengthening part 20'' and the outer surface of the inner side section of the first side S1'' of the blade base 102'' form the blade A face 3'' of the composite blade M''; the outer surface of the second side S2'' of the blade base 102'' includes an inwardly inclined cutting edge face 13'' at the outer side section, and the outer surface of the second side S2'' of the blade base 102'' is the blade B face 4'' of the composite blade M''. The blade A face 3'' intersects the blade B face 4'' to form a cutting edge V'' at the outer edge, and the thin-layer alloy strengthening part 20'' extends to the cutting edge V''.

[0231] Because the thin-layer alloy strengthening part 20'' has a hardness greater than that of the blade base 102'', the blade A face 3'' and the blade B face 4'' have different degrees of wear during the working process of the tool body 100'', which makes the two blade faces have different wear ratios and forms a self-sharpening effect.

[0232] Different from the first embodiment, the body part 101'' includes opposite blade A face 1'' and blade B face 2'', which are substantially parallel; the blade A face 1'' and the blade A face 3'' are located in the same plane, and the blade B face 2'' and the blade B face 4'' form an obtuse angle. The blade B face 4'' is inwardly inclined towards the cutting edge V'', which is actually a single-sided blade face cutter. In the use scenario of the recycled material crushing cutter, the recycled material hits the cutting edge V'' at a certain speed to produce instantaneous cutting, thereby achieving the purpose of crushing.

[0233] In the present embodiment, the thickness of the thin-layered alloy strengthening portion 20'' is less than 0.5 mm. That is, during the cutting operation, the blade B face 4'' is first worn due to the lower hardness, so that the leading edge of the thin-layered alloy strengthening portion 20'' protrudes, and the thickness of the thin-layered alloy strengthening portion 20'' is less than 0.5 mm, so that the radius of the blade edge V'' after wear is always less than 0.5 mm, and the self-sharpening regenerative material-breaking tool can maintain a relatively sharp cutting performance for a long time. Further, the thickness of the thin-layered alloy strengthening portion 20'' is preferably less than 0.2 mm.

[0234] In the present embodiment, the HRC value of the thin-layered alloy strengthening portion 20'' is greater than the HRC value of the blade base 102'', and the difference between the two is greater than 2HRC. Such a hardness difference forms a hardness gradient change, which has a better self-sharpening effect.

[0235] In the present embodiment, the thin-layered alloy strengthening portion 20'' is formed by the strengthening additive base material 300'' attached to the initial blade base 102C'', which is melted into the molten pool after laser beam scanning and alloyed with the base material of the initial blade base 102C''. Therefore, unlike the ordinary laser cladding process, it has better layer bonding, avoiding the problem of poor bonding between the cladding layer and the base material of the blade base 102'' that may occur in the laser cladding process, which is prone to cracking and falling off.

[0236] More importantly, the cladding layer protrudes from the surface of the blade base 102'' formed by machining, affecting the profile design of the cutting edge, so that the cutting performance of the cutting edge is not controlled. In the present embodiment, the strengthening additive base material 300'' is melted into the molten pool, so that the thin-layered alloy strengthening portion 20'' is "embedded" in the blade base 102'', and the outer surface of the thin-layered alloy strengthening portion 20'' away from the blade base 102'' is substantially flush with the outer surface of the inner side section of the blade base 102'', substantially maintaining the profile of the cutting edge formed according to the design machining, and maintaining the stability and consistency of the cutting performance of the cutting edge.

[0237] Further preferably, the thin-layered alloy strengthening portion 20'' includes a plurality of strip-shaped strips J'' arranged in parallel and overlapping to form a micro-sawtooth concave-convex structure, and the strip-shaped strips J'' are arranged at an angle of 10-90° with respect to the blade edge V''. The strip-shaped strips J'' are caused by the laser beam scanning in rows with a certain overlap rate.

[0238] Because the strip-shaped strips J'' are arranged at an angle of 10-90°, the longitudinal section of the cutting edge is micro-sawtooth concave-convex, so that the thin-layered alloy strengthening portion 20'' exposed at the position of the blade edge V'' is micro-sawtooth concave-convex, and therefore the blade edge V'' of the self-sharpening regenerative material-breaking tool is micro-sawtooth, which has better cutting performance.

[0239] It should be understood that it is difficult to form a micro-sawtooth concave-convex structure by general mechanical processing, and a sawtooth concave-convex structure that is too large is not suitable for cutting of fine food materials. The present embodiment breaks through the technical bottleneck in the field of tool processing and realizes a micro-sawtooth-shaped blade edge V''.

[0240] From the front of the tool body 100'', the thin-layered alloy strengthening portion 20'' presents a relatively narrow strip-shaped structure on one surface. Preferably, the width of the thin-layered alloy strengthening portion 20'' is 5-50 mm. It should be understood that only a thin-layered alloy strengthening portion 20'' with a very small width is needed to achieve the technical purpose.

[0241] Preferably, the thickness of the body portion 101'' ranges from 3 to 50 mm. The composite blade edge M'' presents a composition gradient change structure in the longitudinal section. First, the blade base portion 102'' occupies the main part of the thickness, so that the tool as a whole retains the characteristics of the base material of the tool base body 10''. The composition of the thin-layered alloy strengthening portion 20'' with a thickness of less than 0.5 mm is also not homogeneous. It should be said that it also includes a portion that is metallurgically combined with the base material. The thin-layered alloy strengthening portion 20'' not only contributes to the self-sharpening of the tool, but also enhances the strength of the tool itself.

[0242] The present embodiment also specifically provides a specific preparation method of the self-sharpening blade type regenerative material crushing tool.

[0243] Step A: As shown in Figure 20 , a tool blank Y'' is prepared and pretreated. One side of the tool blank Y'' is an initial blade base portion 102C''.

[0244] Step B: As shown in Figure 21 , the outer side segment of the first side L1'' of the treated initial blade base portion 102C'' is sprayed with a strengthening additive base 300''. The strengthening additive base 300'' forms a strip-shaped thin-layered attachment area with a certain width and thickness on the first side L1''.

[0245] Step C: As shown in Figure 22 , a laser beam T'' scans the surface of the first side of the initial blade base portion 102C'' covered by the strengthening additive base 300''. The first side of the initial blade base portion 102C'' forms a molten pool, and the strengthening additive base 300'' is melted into the molten pool and alloyed with the base material of the initial blade base portion 102C'' to form a thin-layered alloy strengthening portion 20'' melted into the first side of the initial blade base portion 102C'', as shown in Figure 23 .

[0246] Step D: As shown in Figure 23As shown, the surface of the second side L2'' of the initial blade base 102C'' is processed, and the outer surface of the second side forms an inwardly inclined land surface 13''; a composite blade M'' with a gradually decreasing thickness from inside to outside is formed; the composite blade M'' includes a thin-layer alloy strengthening portion 20'' and a blade base 102'' obtained by processing the initial blade base 102C''; the thin-layer alloy strengthening portion 20'' extends to the cutting edge and intersects the land surface 13'' of the blade base 102'' at an acute angle to form a cutting edge V'' at the outer edge.

[0247] In this embodiment, preferably, step A includes the following sub-steps:

[0248] Step A1: The steel material is cut by a machine to obtain a cutter blank Y'' of a regenerative material breaking tool.

[0249] Step A2: The first side S1'' of the cutter blank Y'' is subjected to surface treatment by a mechanical method to remove the oxide scale on the surface of the cutter blank Y'' that needs to be strengthened.

[0250] In this embodiment, the strengthening additive base 300'' exists in the form of a slurry, which improves the uniformity of the components and the adhesion of the strengthening additive base 300'' to the initial blade base 102C''. Accordingly, the strengthening additive base 300'' slurry needs to be prepared before step B. This pre-step specifically includes the following steps:

[0251] Step B1: The strengthening additive base 300'' powder is prepared according to the requirements and is mixed, ground, and stirred.

[0252] Step B2: The mixed powder obtained in step B1 is mixed with water, emulsifiers, and other components, and is mixed and stirred to prepare the strengthening additive base 300'' slurry.

[0253] It should be noted that the components of the strengthening additive base 300'' are not limited, which can be pure carbon powder, a mixture including carbon powder, silicon powder, and boron powder, and can further include ceramic powders such as carbide, nitride, boride, and oxide.

[0254] In this embodiment, the strengthening additive base 300'' powder is a metal-ceramic composite material. The pre-step is specifically embodied as the following steps:

[0255] Step B1: Take 18 parts by weight of zirconium niobium carbide complex carbide solid solution powder with a purity of 97.2%, 8 parts by weight of tungsten carbide solid solution powder with a purity of 98.5%, 8 parts by weight of titanium carbide solid solution powder with a purity of 95.9%, 6 parts by weight of silicon carbide solid solution powder with a purity of 97.9%, 12 parts by weight of aluminum oxide powder with a purity of 96.2%, 13 parts by weight of nickel powder with a purity of 97.1%, 11 parts by weight of iron powder with a purity of 90.5%, and 9 parts by weight of manganese powder with a purity of 95.4% in a ball mill at a speed of 300 rpm for 3 h to obtain a cermet composite material.

[0256] Step B2: Take 15 parts by weight of the cermet composite material, 100 parts by weight of alcohol with a purity of 99%, and 150 parts of tap water in a container and stir for 0.5 h to obtain a reinforced additive base 300'' slurry.

[0257] In the reinforced additive base 300'' provided in the present embodiment, the metal substances such as iron powder and manganese powder improve the metallurgical bonding ability of the reinforced additive base 300'' with the base material of the tool substrate 10'', further improving the stability of the structure. Carbides and silicon carbides contribute to the improvement of hardness. And the interlocking reinforcement effect of oxides and carbides relieves the structure strain, thereby enhancing the structural stability of the thin-layered alloy reinforcement 20''.

[0258] In step B, preferably, the thickness of the reinforced additive base 300'' is 0.1-0.2 mm. The thickness of the laying of the reinforced additive base 300'' is also an important parameter affecting the final thickness of the thin-layered alloy reinforcement 20''. The thickness of the reinforced additive base 300'' in the present embodiment is 0.1-0.2 mm, which is based on the preferred value obtained from repeated experiments.

[0259] The spot of the laser beam in step C can be circular or square, and the diameter or side length of the spot is less than 1 mm. The diameter of the spot is related to at least two key points: first, the thickness of the thin-layered alloy reinforcement 20''; second, the size of the strip-shaped band J'' and the micro-sawtooth-shaped concave-convex. It should be noted that the laser power is inversely related to the speed, and the laser can be continuous or pulsed.

[0260] The laser beam scanning direction in step C is perpendicular to the outer edge of the initial blade base 102C'' or at an inclined angle of 10-90° to the outer edge of the initial blade base 102C''. The laser beam scans the strip-shaped thin layer adhesion area row by row with a 0-100% overlap to simultaneously act on the reinforcing additive base material 300'' and the initial blade base 102C''; during the laser beam scanning process, the initial blade base 102C'' forms a molten pool, the reinforcing additive base material 300'' enters the molten pool and is alloyed with the base material of the initial blade base 102C'' to form a thin layer-shaped alloy reinforcing part 20'', so that the surface of the thin layer-shaped alloy reinforcing part 20'' forms strip-shaped bands J'' that overlap each other, and the blade edge V'' is micro-sawtooth-shaped due to the juxtaposed strip-shaped bands J''. The overlap rate is the ratio of the area of the next row covering the previous row to the area of the next row when the laser scans row by row. The entire step C processing process is protected by a nitrogen or argon or carbon dioxide atmosphere.

[0261] After step C, the outer surface of the thin layer-shaped alloy reinforcing part 20'' forms the blade A surface 3''. The outer surface of the thin layer-shaped alloy reinforcing part 20'' is substantially flush with the outer surface of the first side S1'' inner section of the blade base 102''.

[0262] Step D specifically grinds the second side S2'' surface of the blade base 102'' of the tool body 100'' to which the thin layer-shaped alloy reinforcing part 20'' has been compounded to form an inwardly inclined blade opening surface 13'', and further forms a compound cutting edge M'' with a thickness gradually decreasing from the inside to the outside.

[0263] The initial blade base 102C'' is finally processed to become the blade base 102'', and the second side S2'' surface of the blade base 102'' forms the blade B surface 4''. The blade A surface 3'' and the blade B surface 4'' intersect, the thin layer-shaped alloy reinforcing part 20'' extends to the tool edge, and the outer surface of the part of the thin layer-shaped alloy reinforcing part 20'' on the first inclined surface intersects the blade opening surface 13'' of the blade base 102'' at an acute angle to form a blade edge V'' on the outer edge.

[0264] Of course, the steps of steps A-D above can also be further optimized. In step A, the second side S2'' of the initial blade base 102C'' is ground to form a single-sided blade surface that gradually inclines inwardly toward the outer edge. This single-sided blade surface is a rough machining inclined surface, which is different from the blade opening surface 13'' formed in step D. In step D, the blade opening surface 13'' is formed by inclined surface finishing. This is because it is beneficial to save finishing time and improve production efficiency by machining a rough machining inclined surface in advance to prepare the blade opening surface 13''.

[0265] In addition, between step C and step D, there is also an optimization step E, which includes low-temperature tempering of the tool after step C laser operation by a muffle furnace. The laser-processed blade is tempered by a muffle furnace at a temperature of 180-200'' degrees for 2 hours. Through low-temperature tempering, the rigidity, hardness, wear resistance, fatigue strength and toughness of the tool are improved. Further heat treatment is performed on the thin-layer alloy strengthening part 20'' to improve the strength, bonding degree and stability of the thin-layer alloy strengthening part 20''.

[0266] Further, before step D, there is also an optimization step F, which includes adjusting and controlling the deformation amount of the tool after the previous step operation by applying pressure from top to bottom. Specifically, the regenerated material crushing knife is adjusted by applying 8Mpa pressure from top to bottom, and the deformation amount of the regenerated material crushing knife is controlled within 0.01mm. It should be noted that the two optimization steps are not necessary. If two steps are included, step F is after step E and before step D. Of course, it can also contain only one of steps E or D. Then the optimization step of any one of them is after step C and before step D.

[0267] The various self-sharpening knives and their preparation methods provided by the present application are described in detail above. In this paper, specific examples are used to explain the principles and implementation methods of the present application. The above examples are only used to help understand the present application and the core idea. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present application. Based on the technical concept presented in examples one to three, the structure and preparation method of the self-sharpening knife are also suitable for various knives such as agricultural feed chopping knives, especially for some knives with high manufacturing cost and high sharpness requirement.

[0268] The self-sharpening knives and their preparation methods provided by the present application are described in detail above. In this paper, specific examples are used to explain the principles and implementation methods of the present application. The above examples are only used to help understand the present application and the core idea. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A method for preparing a self-sharpening cutting tool: characterized in that... Includes the following steps: Step A: Prepare a tool blank and perform pretreatment, wherein one side of the tool blank is the initial cutting edge base; Step B: Spray a reinforcing additive base onto the outer section of the first side of the treated initial blade base; The reinforcing additive matrix forms a strip-shaped thin-layer adhesion area with a certain width and thickness on the first side of the initial blade base; Step C: The laser beam scans the strip-shaped thin-layer adhesion area line by line with an overlap of 0-50% to simultaneously strengthen the additive matrix and the initial blade base; During laser beam scanning, a molten pool is formed on the first side of the initial blade base. The reinforcing additive matrix is ​​melted into the molten pool and alloyed with the base material of the initial blade base to form a thin-layered alloy reinforcing part melted into the first side of the initial blade base. The surface of the thin-layered alloy reinforcement section forms overlapping strips, and the cutting edge has a micro-serrated unevenness due to the parallel strips. Step D: Process the surface of the second side of the initial blade base, and form an inwardly inclined cutting surface on the outer surface of the second side; form a composite blade with a thickness that gradually decreases from the inside to the outside; the composite blade includes the thin-layered alloy reinforcement and the blade base obtained by processing the initial blade base; the thin-layered alloy reinforcement extends to the edge of the tool and intersects the cutting surface of the blade base at an acute angle to form a cutting edge on the outer edge.

2. The method for preparing the self-sharpening cutting tool according to claim 1: characterized in that... The steps, in sequence, are as follows: Step A: Prepare a tool blank and perform pretreatment, wherein one side of the tool blank is the initial cutting edge base; Grind the first side of the initial cutting edge base to form a first single-sided cutting surface that gradually slopes inward from the outer edge; Step B: Uniformly spray reinforced additive base material onto the outer section of the first single-sided cutting edge; The reinforced additive matrix forms a strip-shaped thin-layer adhesion area with a certain width and thickness on the first single-sided cutting surface; Step C: The laser beam scans the strip-shaped thin-layer adhesion area line by line with a certain overlap rate to simultaneously reinforce the additive matrix and the initial blade base; During laser beam scanning, the initial blade base forms a molten pool, and the reinforcing additive matrix enters the molten pool and alloys with the base material of the initial blade base to form a thin-layer alloy reinforcing part; Step D: Grind the surface of the second side of the initial cutting edge base to form a second single-sided cutting edge symmetrical to the first single-sided cutting edge, the second single-sided cutting edge including the outermost opening surface; the thin layered alloy reinforcement extends to the outer edge of the tool and intersects the opening surface at an acute angle to form a cutting edge.

3. The method for preparing a self-sharpening cutting tool according to claim 2, characterized in that: In step A, the first single-sided cutting surface includes a first inclined surface and a second inclined surface that are in contact, and the slope of the outer first inclined surface is greater than the slope of the inner second inclined surface. Correspondingly, in step D, the second single-sided cutting surface includes a third inclined surface symmetrical to the first inclined surface and a fourth inclined surface symmetrical to the second inclined surface. The third inclined surface is the cutting surface, and the angle between the third inclined surface and the outer surface of the thin-layered alloy reinforcement is the cutting angle.

4. The method for preparing a self-sharpening cutting tool according to claim 1: characterized in that... The width of the thin-layer alloy reinforcement is 3~10mm, the material thickness of the strip-shaped thin-layer adhesion area is 0.01~0.05mm, and the thickness of the thin-layer alloy reinforcement is less than 5μm; Alternatively, the width of the thin-layer alloy reinforcement portion may be 5-50 mm, the material thickness of the strip-shaped thin-layer attachment area may be 0.1-0.2 mm, and the thickness of the thin-layer alloy reinforcement portion may be less than 0.5 mm.

5. The method for preparing a self-sharpening cutting tool according to claim 1: characterized in that... Between step C and step D, there is also an optimization step E, which includes low-temperature tempering of the tool after laser operation in step C using a muffle furnace.

6. The method for preparing a self-sharpening cutting tool according to claim 1: characterized in that... Before step D, there is also an optimization step F, which includes adjusting the pressure applied to the tool after the previous step from top to bottom and controlling the amount of deformation.

7. The method for preparing a self-sharpening cutting tool according to claim 1: characterized in that: In step C, the laser beam scanning direction is perpendicular to the outer edge of the initial blade base or at a certain angle to the outer edge of the initial blade base; step C is performed under the protection of nitrogen, argon or carbon dioxide atmosphere.

8. The method for preparing a self-sharpening cutting tool according to claim 1: characterized in that: The laser beam in step C has a circular or square spot, and the spot diameter is less than 200 μm or less than 1 mm.

9. A self-sharpening kitchen knife, characterized in that... The self-sharpening cutting tool is prepared by the method described in claim 1, and includes a tool base, wherein the tool base includes a body portion and a cutting edge portion; The outer section of the first side of the blade base is provided with a thin-layered alloy reinforcement, which is embedded in the blade base. The thin-layer alloy reinforcement is formed by the reinforcement additive base material attached to the initial blade base, which is melted into the molten pool after being scanned by a laser beam and then alloyed with the base material of the initial blade base. The thin-layered alloy reinforcement is embedded in the blade base and fused with the blade base to form a metallurgical bonding structure. The thin-layer alloy reinforcement includes multiple parallel overlapping strips formed by laser beam scanning. The strips are set at an angle of 10 to 90 degrees to the cutting edge, and the cutting edge has micro-serrated protrusions and depressions due to the parallel strips. The HRC value of the thin-layered alloy reinforcement is greater than the HRC value of the blade base, and the difference between the two is greater than 2HRC. The thin-layered alloy reinforcement and the blade base together form a composite blade with a thickness that gradually decreases from the inside to the outside; The outer surface of the thin-layer alloy reinforcement is approximately flush with the outer surface of the first inner section of the blade base, so as to jointly form the A-side of the composite blade. The outer surface of the second side of the blade base includes an inwardly inclined cutting surface located on the outer side, and the outer surface of the second side of the blade base is the B-side of the composite blade. The cutting edge A and the cutting edge B intersect at the outer edge to form a cutting edge, and the thin layered alloy reinforcement extends to the cutting edge, with a thickness of less than 5 μm.

10. The self-sharpening kitchen knife according to claim 9, characterized in that... The composite blade is a double-sided blade; The body portion includes a blade A surface and a blade B surface that are opposite each other in the thickness direction; The blade A surface is inclined inward from the blade A surface, and the blade B surface is inclined inward from the blade B surface.

11. The self-sharpening kitchen knife according to claim 9, characterized in that... The composite blade is a single-sided blade. The body portion includes a blade A surface and a blade B surface that are opposite each other in the thickness direction; The blade A surface and the cutting edge A surface are located on the same plane, and the blade B surface and the cutting edge B surface form an obtuse angle.

12. The self-sharpening kitchen knife according to claim 9, characterized in that... The width of the thin-layered alloy reinforcement is 1~20mm.

13. The self-sharpening kitchen knife according to claim 9, characterized in that... The reinforced additive matrix includes one or more of the following: carbon powder, silicon powder, boron powder, carbide, nitride, boride, and oxide.

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