Extremely sharp cutter and manufacturing method thereof

Abstract

The extremely sharp cutter comprises a cutter body base material with a cutting edge part, the surfaces of the two sides of the cutting edge part are a first cutting edge face and a second cutting edge face respectively, a high-hardness film layer is attached to the first cutting edge face or the second cutting edge face, or film layers are attached to the first cutting edge face and the second cutting edge face. The invention further discloses a manufacturing method of the extremely sharp cutter. The sharpness and lasting sharpness of the cutting tool are greatly improved.

Description

Technical Field

[0001] The invention relates to an extremely sharp knife and a method for manufacturing the same. Background Art

[0002] Currently, the kitchen or outdoor knives, fish knives, daggers and other cutting knives on the market are generally sharpened with a regular angle of 35°, and the blade surface is sanded. Generally, the grinding belt or grinding wheel with a grinding grit of 240# or 320# can meet the basic cutting function, but the obvious defect is: the conventional sanded blade surface and the blade with an angle of about 35°, the initial sharpness and long-term sharpness (retention) of the product are not good.

[0003] Therefore, an extremely sharp knife and a method for making the same are provided. Summary of the invention

[0004] The purpose of the present invention is to overcome the existing defects and provide an extremely sharp knife and a manufacturing method thereof, which greatly improves the sharpness and long-lasting sharpness of the cutting knife.

[0005] The technical solution to achieve the above purpose is: One of the present invention is an extremely sharp tool, comprising: a tool body substrate having a blade portion, the surfaces on both sides of the blade portion are respectively a first blade face and a second blade face, a film layer is attached to the first blade face or the second blade face, or a film layer is attached to both the first blade face and the second blade face.

[0006] Preferably, a film layer is attached to the first blade surface or the second blade surface by a PVD or CVD process.

[0007] A second method for making an extremely sharp knife according to the present invention comprises: Step S1, selecting a blade substrate with a rectangular cross-sectional shape; Step S2, grinding the first blade surface or grinding the two blade surfaces, and attaching a film layer to the first blade surface or the two edge blade surfaces through a PVD or CVD process; Step S3, then grinding the cutter body substrate into a trapezoidal cross section or other cross-section shapes to form a cutter face according to a conventional cutter manufacturing method; Step S4, after grinding the blade surface, selectively adding PVD, painting, blackening or stone washing surface processing to the blade surface; Step S5, grinding the blade surface of the blade body substrate with one blade surface to obtain another blade surface, and for the blade body substrate with two blade surfaces, re-grinding one blade surface or not re-grinding the blade surface, and grinding the blade surface on the other blade surface of the blade body substrate with the small inclined surface, small concave surface or small convex surface after the original grinding as the final blade surface; Step S6, finally, the blade substrate with the blade surface ground can be selectively coated with other materials to produce an extremely sharp tool.

[0008] Preferably, in step S1, the blade substrate is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel; In the step S2, the blade substrates are bundled and placed in a circular manner to be loaded into a furnace, or a single blade is placed in a circular manner to be loaded into a furnace to be coated; In the step S2, if only one blade face is selected to have a film layer, it is preferred to first form a single blade face for coating, and then process another blade face on the other blade face to form a final blade edge shape; In the step S2, a blade body made of other materials can be welded on the blade body substrate after the first blade surface is ground or the two blade surfaces are ground. The blade body material is one of martensitic stainless steel, austenitic stainless steel, ferritic stainless steel, duplex stainless steel, die steel, high-speed steel or heat-resistant steel; In the step S2, the film layer includes but is not limited to an outer wear-resistant layer of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti, TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; Among them, the hardness of the outer wear-resistant layer is higher than that of the base material of the cutter body; In step S3, the blade grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheels can be added to polish the surface; In step S5, the cross-sectional shape of the cutting edge includes but is not limited to: a V-shaped cutting edge with a symmetrical angle, a V-shaped cutting edge with an asymmetrical angle, a U-shaped cutting edge, a hard cutting edge, or a hard cutting edge on one side and a V-cut edge on the other side; the cutting edge angle range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm; In step S5, after the blade surface is ground, the blade tip is deburred, and the deburring treatment includes but is not limited to: a leaf-shaped leather wheel or a soft leather wheel with polishing wax, a cloth wheel with polishing wax, a cloth and linen wheel with polishing wax, a swinging cloth, dry ice or liquid nitrogen; In step S6, the final tool surface includes but is not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coating surface, a CVD coating surface, or a selectively added painted, blackened, stone washed or sandblasted surface.

[0009] The third method of the present invention is a method for making an extremely sharp knife, comprising: Step T1, selecting a blade substrate with a rectangular cross-section, and grinding the blade substrate into a trapezoidal cross-section or other cross-section according to a conventional tool manufacturing method to form a blade surface; Step T2, selecting to first open a single-sided cutting edge, a double-sided cutting edge, or one of the cutting edges as the final cutting edge, and attaching a film layer to the surface of the cutting body substrate and the first cutting edge or both cutting edges through a PVD or CVD process; Step T3, on this basis, choose whether to selectively add PVD, painting, blackening or stone washing surface processing to the blade surface; Step T4, grinding the other blade surface of the blade body substrate with one blade surface, re-grinding one blade surface or not re-grinding the blade surface of the blade body substrate with the blade surface after the original grinding as the final blade surface, grinding the blade surface on the other blade surface; Step T5, finally, the blade substrate with the ground cutting edge can be selectively coated with other materials to produce an extremely sharp tool.

[0010] Preferably, in step T1, the blade substrate is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel; In step T1, the blade grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheels can be added to polish the surface; In the step T2, the furnace is loaded by a single hanging arrangement to perform coating; In the step T2, the film layer includes but is not limited to an outer wear-resistant layer of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti, TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; Among them, the hardness of the outer wear-resistant layer is higher than that of the base material of the cutter body; In step T4, the cross-sectional shape of the cutting edge includes but is not limited to: a symmetrical V-shaped edge, an asymmetrical V-shaped edge, a U-shaped edge, a hard edge, or a hard edge on one side and a V edge on the other side; the cutting edge angle range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm; In step T4, after the blade surface is ground, the blade tip is deburred, and the deburring treatment includes but is not limited to: a leaf-shaped leather wheel or a soft leather wheel with polishing wax, a cloth wheel with polishing wax, a cloth and linen wheel with polishing wax, a swinging cloth, dry ice or liquid nitrogen; In step T5, the final tool surface includes but is not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coating surface, a CVD coating surface, or a selectively added painted, blackened, stone washed or sandblasted surface.

[0011] A fourth method of making an extremely sharp knife according to the present invention comprises: Step A1, selecting a blade substrate with a rectangular cross-section shape, first grinding the blade surface on one side of the blade substrate, and then grinding a single-sided small bevel, a small concave surface, a small convex surface, a small blade surface, or a double-sided small bevel, a small concave surface, a small convex surface, a small blade surface; Step A2, using PVD or CVD process to make one or both edge surfaces and the ground blade surface adhere to a film layer; Step A3, then grinding the cutter body substrate into a trapezoidal cross section or other cross sections to form a cutter face according to a conventional cutter manufacturing method; Step A4, after grinding the blade surface, selectively adding PVD, painting, blackening or stone washing surface processing to the blade surface; Step A5, grinding the blade surface of the blade body substrate with one blade surface to obtain another blade surface, and for the blade body substrate with two blade surfaces, re-grinding one blade surface or not re-grinding the blade surface, and grinding the blade surface on the other blade surface of the blade body substrate with the blade surface after the original grinding as the final blade surface; Step A6, finally, the blade substrate with the ground cutting edge can be selectively coated with other materials to produce an extremely sharp tool.

[0012] Preferably, in step A1, the blade substrate is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel; In the step A2, the blade substrates are bundled and placed in a furnace in an outward circular arrangement, or a single blade is placed in a furnace in an outward circular arrangement, or a single blade is placed in a furnace in a hanging arrangement, and the coating is performed; In the step A2, the film layer includes but is not limited to an outer wear-resistant layer of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti, TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; Among them, the hardness of the outer wear-resistant layer is higher than that of the base material of the cutter body; In step A1 or step A3, the blade surface grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheels can be added to polish the surface.

[0013] Preferably, in step A5, the cross-sectional shape of the cutting edge includes but is not limited to: a V-shaped cutting edge with a symmetrical angle, a V-shaped cutting edge with an asymmetrical angle, a U-shaped cutting edge, a hard cutting edge, or a hard cutting edge on one side and a V-cut edge on the other side; the cutting edge angle wrapping range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm; In step A5, after the blade surface is ground, the blade tip is deburred, and the treatment methods include but are not limited to: a leaf leather wheel or a soft leather wheel plus polishing wax, a cloth wheel plus polishing wax, a cloth plus linen wheel plus polishing wax, a reciprocating cloth, dry ice or liquid nitrogen.

[0014] Preferably, in step A6, the final tool surface is one of but not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coated surface, a CVD coated surface, and a selectively added painted, blackened, stone washed or sandblasted surface.

[0015] The beneficial effects of the present invention are as follows: the present invention discloses three methods for making cutting tools, among which, in the first method for making cutting tools, a high-hardness film is first plated and then the cutting surface is ground, and in the second method for making cutting tools, the cutting surface is first ground and then the high-hardness film is plated. The furnace loading capacity of the first method for making cutting tools is 12-25 times higher than that of the second method for making cutting tools, and the qualified rate of finished products is more than 5 times higher. The manufacturing cost of the first method is 5 times or more lower than that of the second method, and after grinding the cutting surface, it is still possible to choose whether to plate the cutting surface or perform other processes, which is more flexible in product process diversity; but the cutting surface of the second type of cutting tools has functions such as anti-scratch, and the function of the coating of the first type of cutting tools is mainly reflected in the blade surface; the third method for making cutting tools is based on the first method, and one of the cutting surfaces is ground before coating, and this surface is no longer ground after high-hardness coating, thereby avoiding the risk of damage to the film layer on the blade surface during grinding of the cutting surface after coating, thereby improving the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a method for making a first type of cutting tool in a method for making an extremely sharp cutting tool of the present invention; Figure 2 It is a flow chart of a method for making a second type of cutting tool in a method for making an extremely sharp cutting tool of the present invention; Figure 3 It is a flow chart of a method for making a third type of cutting tool in a method for making an extremely sharp cutting tool of the present invention; Figure 4 This is a front view of the first type of tool furnace of the present invention; Figure 5 It is a top view of the first type of tool furnace loading of the present invention; Figure 6 It is another front view of the first type of cutter of the present invention when it is installed in the furnace; Figure 7 It is another top view of the first type of tool of the present invention; Figure 8 It is a front view of the second type of tool installation furnace of the present invention; Fig. 9 It is a top view of the second type of tool furnace of the present invention; Fig.10 This is a schematic diagram of the conventional cross-sectional shape of the blade after grinding; Fig.11 It is a schematic diagram of the conventional cross-sectional shape of the cutting edge; Fig.12 is a schematic diagram of another conventional cross-sectional shape of a cutting edge; Fig.13 is a schematic diagram of another conventional cross-sectional shape of a cutting edge; Fig.14 It is a schematic diagram of the cutting edge thickness shape; Fig.15It is a schematic diagram of the shape of the blade angle; Fig.16 It is a schematic diagram of the first type of cutting tool manufacturing process of the present invention after the first cutting edge surface is ground or the two cutting edges are ground; Fig.17 It is another schematic diagram of the first type of cutting tool manufacturing process of the present invention after the first cutting edge surface is ground or the two cutting edges are ground; Fig.18 It is a schematic diagram of grinding the first blade face or grinding two blade faces and then opening one or two small blade faces on the small inclined surface during the manufacturing process of the first type of tool of the present invention; Fig.19 It is a schematic diagram of the present invention selectively welding a tool body made of other materials on a tool body substrate during the manufacturing process of the first type of tool; Fig. 20 It is a schematic diagram of a cutting tool finally obtained in the present invention, in which a high-hardness film layer is attached to one cutting edge surface and a high-hardness film layer is not attached to the other cutting edge surface; Fig.21 It is a schematic diagram of the cutting tool finally obtained in the present invention having high hardness film layers attached to both edge surfaces; Fig. 22 It is a schematic diagram of the cross-sectional shape of the blade surface during the manufacturing process of the second type of cutting tool in the present invention; Fig.23 It is a schematic diagram of the shape of the third type of cutting tool after grinding during the manufacturing process of the present invention; Fig.24 It is a schematic diagram of the cross-sectional shape of small inclined surfaces, small concave surfaces, and small convex surfaces during the manufacturing process of the third type of cutting tools in the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] An extremely sharp tool comprises: a tool body substrate having a blade portion, the surfaces on both sides of the blade portion are respectively a first blade face and a second blade face, a high hardness film layer is attached to the first blade face or the second blade face, or both the first blade face and the second blade face are attached to the high hardness film layer.

[0020] In an embodiment, a high-hardness film layer is attached to the first blade surface or the second blade surface through a high-hardness PVD or CVD process, and the high-hardness film layer includes but is not limited to an outer wear-resistant layer of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti (B,C,N), TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; wherein the hardness of the outer wear-resistant layer is higher than the hardness of the blade substrate, for example, its hardness reaches HV1000 or above.

[0021] The general manufacturing process of the blade body of a conventional cutting tool is: punching → heat treatment → grinding the blade surface into a trapezoidal cross-section or other shaped cross-section and polishing the surface → opening a single-sided or double-sided cutting edge.

[0022] Fig.10 This is a schematic diagram of the conventional cross-sectional shape after the blade surface is ground. The present technology includes but is not limited to the cross-sectional shape shown; Fig.11 , Fig.12 , Fig.13 This is a schematic diagram of the conventional cross-sectional shape of the cutting edge. The present technology includes but is not limited to the cross-sectional shape of the cutting edge shown, wherein Fig.13 Only one combination of different edge shapes is shown to form a new edge shape. Fig.11 , Fig.12 The different edge shapes shown can all be matched with each other to form new edge shapes; Fig.14 , Fig.15 Schematic diagram of cutting edge thickness and cutting angle.

[0023] Combination Fig.11 , Fig.12 and Fig.13 To define the blade surface. For the final product, the two sides that form the final cutting edge at the cutting edge are defined as the blade surface. For a single-sided cutting tool, the blade surface can be used as one of the blade surfaces.

[0024] The invention discloses a method for making an extremely sharp knife, which comprises methods for making three types of knives.

[0025] like Figure 1 As shown, the method for making the first type of cutting tool comprises: Step S1, selecting a blade substrate with a rectangular cross-section.

[0026] In the embodiment, the blade substrate is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel.

[0027] Before step S2, the blade base material needs to be punched and heat treated, which is a common practice in the industry and is not limited thereto.

[0028] Step S2, grinding the first blade surface or grinding the two-side blade surfaces, and attaching a high-hardness film layer to the first blade surface or the two-side blade surfaces through a high-hardness PVD or CVD process.

[0029] In step S2, if only one blade surface is selected to have a film layer, it is preferred to first form a single blade surface for coating, and then process the other blade surface into another blade surface, thereby forming the final blade shape; compared with the process of first forming two blade surfaces and then coating, and then grinding off the film layer of any blade surface, it can prevent the product from being damaged by ion bombardment during ion cleaning and other processes. According to the test standard of ISO8442-5, the former uses TiB2 as the wear-resistant layer, and the long-term sharpness of the former is more than 15% higher than that of the latter.

[0030] In the embodiment, the high hardness film layer includes but is not limited to an outer wear-resistant layer which is one of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti (B,C,N), TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; wherein the hardness of the outer wear-resistant layer is higher than the hardness of the blade substrate, for example, its hardness reaches HV1000 or above. For example, if the outer wear-resistant layer is TiB2, the hardness can reach HV3800-4200.

[0031] In the embodiment, the Figure 4 , 5 The loading method shown is used for coating. The blade faces are tightly fitted. The blade body substrate, i.e. the blades, are first bundled and then placed in a circular arrangement in the furnace, with the blade edges facing outward. Only the blade edges need to be plated. This method has a high loading capacity, with a total loading capacity of about 2,000 pieces, which is about 12-25 times that of the second type of blades. In addition, due to the small coating area, the qualified rate is about 5 times higher than that of the second type of blade loading method.

[0032] In the embodiment, the Figure 6 , 7 The furnace loading method shown is used for coating. The blades are arranged in a ring shape when entering the furnace, with the blade edge facing outward. Only the blade edge needs to be plated. The loading capacity is high, and the total loading capacity is about 2,000 blades, which is about 12-25 times that of the second type of blades. In addition, due to the small coating area, the qualified rate is about 5 times higher than that of the second type of tool loading method.

[0033] In an embodiment, the sharpening method can be to sharpen the blade by grinding abrasives of different meshes on a single side once or multiple times, such as grinding belts with meshes ranging from 180#-3000#, resin grinding wheels with meshes ranging from 180#-3000#, or CBN grinding wheels of different meshes, or CBN grinding wheels of different meshes or cement grinding wheels, or even manual grindstones with meshes ranging from 200#-10000#.

[0034] Step S3, then grinding the cutter body substrate into a trapezoidal cross section or other cross-section shapes to form a cutter surface according to a conventional cutter manufacturing method.

[0035] In the embodiment, the blade grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheel abrasives can be added to polish the surface.

[0036] Step S4, after grinding the blade surface, selectively adding high hardness PVD, low hardness PVD, painting, blackening or stone washing surface processing to the blade surface.

[0037] Step S5, and grind out the other side of the blade surface for the blade base material with the original blade surface on one side. For the blade base material with the original blade surfaces on both sides, choose to re-grind one of the blade surfaces or not to re-grind the blade surface. For the blade base material with the small inclined surface, small concave surface or small convex surface after the original grinding as the final blade surface, grind out the blade surface on the other side of the blade surface.

[0038] In the embodiment, the cross-sectional shape of the cutting edge includes but is not limited to: a V-shaped blade with a symmetrical angle, a V-shaped blade with an asymmetrical angle, a U-shaped blade, a hard blade, or a hard blade on one side and a V-blade on the other side; the cutting edge angle range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm.

[0039] In the embodiment, burrs will be present on the blade tip after the cutting edge of the tool is ground, and the burrs must be removed to achieve the purpose of smoothly cutting the object. The blade tip burrs can be removed by using a leaf leather wheel or a soft leather wheel plus polishing wax, a cloth wheel plus polishing wax, a cloth and linen wheel plus polishing wax, or by swinging the cloth back and forth, or by adding wax to the aforementioned various wheels to remove most of the burrs and then swinging the cloth, or even by using dry ice or liquid nitrogen to remove the burrs.

[0040] Step S6, finally, the blade body substrate with the blade surface ground can be selectively coated with other materials, or it can be left uncoated, thereby making an extremely sharp tool; In the embodiment, the final tool surface includes but is not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coating surface, a CVD coating surface, or a selectively added painted, blackened, stone washed or sandblasted surface.

[0041] The manufacturing steps of the first type of tool are as follows: A blade base material with a rectangular cross-sectional shape is selected, and the blade base material is punched and heat-treated. The punching and heat-treatment processes are in accordance with the current industry conventional practices and are not limited.

[0042] The first blade surface or two-sided blade surface can be ground, that is, single-sided or double-sided small bevel, small concave, small convex, small blade surface. According to the process design, there are many shapes, such as Fig.16 , 17 As shown, the present technology includes but is not limited to the listed shapes. The blade surface is not ground, and most of the blade surface is still flat so that the blades can fit closely together when loaded for furnace coating to increase the loading capacity. In addition, the non-blade surface of the blade surface does not need to be coated, so it can also be arranged in a single ring to increase the loading capacity; the surface of the small bevel or small edge can be used as one of the edges of the final edge without grinding after coating. As for the grinding method of small bevels or small edges, it can be operated according to the current industry technical processing method, and this technical solution is not limited. The blade position still has a plane with a width of ≥0.1mm instead of a sharp blade tip, so as to avoid damaging the blade tip when the blade is bombarded with ions; and a sandblasting process can be added before coating to increase the adhesion of the film layer. If a sharp blade tip is made first, the blade tip will be easily damaged during sandblasting, thereby limiting the diversity of the process; Furthermore, if the blade tip is made sharp at the beginning, it is easy to damage the blade tip during the production process, resulting in an increase in defective products.

[0043] One or two small blade faces can be further opened on the small bevel. The opening of a small blade face can directly open a sharp blade tip, or there can still be a plane with a width of ≥0.1mm at the blade position instead of a sharp blade tip; the blade with two small blade faces is a sharp blade tip, such as Fig.18 Several examples are shown but are not limited to Fig.18 The combinations listed can be the above Fig.16 , Fig.17 A variety of cross-sectional shapes. The blade shape can be Fig.11 , Fig.12 , Fig.13 For the convenience of description, the cutting edge is exemplified by a V-shaped cutting edge. For the single-sided small bevel, small concave, small convex, and small blade solution, the positions of the small bevel, small concave, small convex, and small blade on the left or right side of the blade can be interchanged.

[0044] Further, a blade body of other materials can be selectively welded on the blade body substrate after the first blade surface is ground or the two blade surfaces are ground. The blade body material is one of martensitic stainless steel, austenitic stainless steel, ferritic stainless steel, duplex stainless steel, die steel, high-speed steel or heat-resistant steel; wherein the blade body substrate after the first blade surface is ground or the two blade surfaces are ground is used as the lower part, and the blade body of other materials is welded as the upper part, and the shape of the lower part can be Fig.16 , Fig.17 , Fig.18 One of the pictures; Fig.19 This is a welding diagram.

[0045] Through PVD or CVD process, a high hardness film is plated on the blade surface. As long as the hardness of the outer wear-resistant layer of the high hardness film is higher than the hardness of the blade body, such as HV1000 or above, the hardness of the outer wear-resistant layer can reach HV1500 or above.

[0046] Grind the blade surface to obtain the desired blade cross section. The blade cross section shape can be Fig.10 One of the shapes after grinding shown in the figure, the present technology includes but is not limited to Fig.10 The cross-sectional shape.

[0047] It is optional to add high hardness PVD, CVD, low hardness PVD, painting, blackening, stone washing and other surface processes on the non-edge surface of the blade after high hardness film coating.

[0048] For blades with one original blade surface, grind out the other blade surface. For blades with two original blade surfaces, you can choose to re-grind one of the blade surfaces or not. For blades with a small bevel, small concave surface, or small convex surface as the final blade surface after the original grinding, grind out the blade surface on the other blade surface. The polishing method and surface brightness of the blade surface are as mentioned above, and are not restricted or limited according to the current industry process. The preferred blade thickness is 0.1mm-0.3mm, the preferred blade angle is a wrap angle of 6-30°, and the preferred angle is a single-sided blade angle of 1°-16°. The cross-sectional shape of the blade surface, this technology includes but is not limited to Fig.11 , Fig.12 , Fig.13 For the convenience of description, the cutting edges are all taken as examples of V-shaped cutting edges.

[0049] Finally, the product can be selectively coated with other materials.

[0050] The final edge has two blade surfaces, one of which has a high hardness film layer attached to the surface, and the other has no high hardness film layer attached to the surface. Fig. 20 As shown; Or the two sides of the final cutting edge, both sides of the cutting edge surface are attached with a high hardness film layer, such as Fig.21 shown.

[0051] like Figure 2 As shown, the method for making the second type of tool comprises: Step T1, selecting a blade substrate with a rectangular cross-section shape, and grinding the blade substrate into a trapezoidal cross-section or other cross-section shapes according to a conventional tool manufacturing method to form a blade surface.

[0052] In the embodiment, the blade substrate is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel.

[0053] In the embodiment, the blade grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheel abrasives can be added to polish the surface.

[0054] Step T2, choose to open a single-sided cutting edge, a double-sided cutting edge or one of the cutting edges as the final cutting edge, and use a high-hardness PVD or CVD process to attach a high-hardness film layer to the surface of the blade substrate and the first cutting edge or both cutting edges.

[0055] In the embodiment, the high hardness film layer includes but is not limited to an outer wear-resistant layer which is one of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti (B,C,N), TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; wherein the hardness of the outer wear-resistant layer is higher than the hardness of the blade substrate, for example, its hardness reaches HV1000 or above.

[0056] In the embodiment, the Figure 8 , 9 The loading method shown in the figure is used for coating. The blade faces need to be hung separately. Both the cutting edge and the blade face need to be coated. The loading amount is low, and the total loading amount of kitchen knives is about 104, so the product rate is also low. However, the blade face and the single or double-sided blade face are coated, so the blade face has functions such as scratch resistance.

[0057] In an embodiment, the sharpening method can be to sharpen the blade by grinding abrasives of different meshes on a single side once or multiple times, such as grinding with a grinding belt with meshes ranging from 180#-3000#, a resin grinding wheel with meshes ranging from 180#-3000#, or grinding with CBN grinding wheels of different meshes or cement grinding wheels or even manual grindstones ranging from 200#-10000#.

[0058] Step T3, on this basis, choose whether to selectively add high hardness PVD, low hardness PVD, painting, blackening or stone washing surface processing to the blade surface.

[0059] Step T4, grind out the other side of the blade surface for the blade base material with the original one side blade surface, and choose to re-grind one side of the blade surface or not to re-grind the blade surface for the blade base material with the original ground blade surface as the final blade surface, grind out the blade surface on the other side of the blade surface.

[0060] In the embodiment, the cross-sectional shape of the cutting edge includes but is not limited to: a V-shaped blade with a symmetrical angle, a V-shaped blade with an asymmetrical angle, a U-shaped blade, a hard blade, or a hard blade on one side and a V-blade on the other side; the cutting edge angle range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm.

[0061] In the embodiment, burrs will be present on the blade tip after the cutting edge of the tool is ground, and the burrs must be removed to achieve the purpose of smoothly cutting the object. The blade tip burrs can be removed by using a leaf leather wheel or a soft leather wheel plus polishing wax, a cloth wheel plus polishing wax, a cloth and linen wheel plus polishing wax, or by swinging the cloth back and forth, or by adding wax to the aforementioned various wheels to remove most of the burrs and then swinging the cloth, or even by using dry ice or liquid nitrogen to remove the burrs.

[0062] Step T5, finally, the blade body substrate with the blade surface ground can be selectively coated with other materials, or it can be left uncoated, thereby making an extremely sharp tool; In the embodiment, the final tool surface includes but is not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coating surface, a CVD coating surface, or a selectively added painted, blackened, stone washed or sandblasted surface.

[0063] The manufacturing steps of the second type of tool are as follows: A blade base material with a rectangular cross-sectional shape is selected, and the blade base material is punched and heat-treated. The punching and heat-treatment processes are in accordance with the current industry conventional practices and are not limited.

[0064] Grind the blade surface to obtain the desired blade cross section. The blade cross section shape can be Fig.10 One of the shapes after grinding shown in the figure, the present technology includes but is not limited to Fig.10 The cross-sectional shape.

[0065] Grind one or both sides of the blade. The polishing method and surface brightness of the blade are as mentioned above, and are not limited according to the current industry process. The cross-sectional shape of the blade, this technology includes but is not limited to Fig.11 , Fig.12 , Fig.13 , Fig. 22 For the convenience of description, the cutting edges are all V-shaped as an example.

[0066] Through PVD or CVD process, a high hardness film is plated on the blade and edge. As long as the hardness of the outer wear-resistant layer of the high hardness film is higher than the hardness of the blade body, such as HV1000 or above, the hardness of the outer wear-resistant layer can reach HV1500 or above.

[0067] It is optional to add high hardness PVD, CVD, low hardness PVD, painting, blackening, stone washing and other surface processes on the non-edge surface of the blade after high hardness film coating.

[0068] For blades with one original blade surface, grind out the other blade surface; for blades with two original blade surfaces, you can choose to re-grind one of the blade surfaces or not. For blades with the original ground blade surface as the final blade surface, grind out the blade surface on the other blade surface. The polishing method and surface brightness of the blade surface are as mentioned above, and are not limited by the current industry process. The preferred blade thickness is 0.1mm-0.3mm, the preferred blade angle is a wrap angle of 6-30°, and the preferred angle is a single-sided blade angle of 1°-16°. The cross-sectional shape of the blade surface, this technology includes but is not limited to Fig.11 , Fig.12 , Fig.13 For the convenience of description, the following cutting edges are all V-shaped cutting edges as examples. The position of the single-sided small cutting edge on the left or right side of the blade can be exchanged.

[0069] Finally, the product can be selectively coated with other materials.

[0070] The final edge has two blade surfaces, one of which has a high hardness film layer attached to the surface, and the other has no high hardness film layer attached to the surface. Fig. 20 As shown; Or the two sides of the final cutting edge, both sides of the cutting edge surface are attached with a high hardness film layer, such as Fig.21 shown.

[0071] like Figure 3 As shown, the method for making the third type of cutting tool comprises: Step A1, select a blade substrate with a rectangular cross-section shape, first grind the single-side blade surface of the blade substrate, and then grind the single-sided small bevel, small concave surface, small convex surface, small blade surface or double-sided small bevel, small concave surface, small convex surface, small blade surface.

[0072] In the embodiment, the blade substrate is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel.

[0073] In the embodiment, the blade grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheel abrasives can be added to polish the surface.

[0074] In an embodiment, the sharpening method can be to sharpen the blade by grinding abrasives of different meshes on a single side once or multiple times, such as grinding with a grinding belt with meshes ranging from 180#-3000#, a resin grinding wheel with meshes ranging from 180#-3000#, or grinding with CBN grinding wheels of different meshes or cement grinding wheels or even manual grindstones ranging from 200#-10000#.

[0075] Step A2, using a high-hardness PVD or CVD process to attach a high-hardness film layer to one or both edge surfaces and the ground blade surface.

[0076] In the embodiment, the high hardness film layer includes but is not limited to an outer wear-resistant layer which is one of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti (B,C,N), TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; wherein the hardness of the outer wear-resistant layer is higher than the hardness of the blade substrate, for example, its hardness reaches HV1000 or above.

[0077] In the embodiment, the following can be used Figure 4-9 The coating is carried out using the furnace loading methods shown respectively.

[0078] Step A3, then grinding the cutter body substrate into a trapezoidal cross section or other cross sections to form a cutter surface according to a conventional cutter manufacturing method.

[0079] In the embodiment, the blade grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheel abrasives can be added to polish the surface.

[0080] Step A4, after grinding the blade surface, selectively add high hardness PVD, low hardness PVD, painting, blackening or stone washing surface processing to the blade surface.

[0081] Step A5, grind out the other side of the blade surface for the blade body substrate with the original one side blade surface. For the blade body substrate with the original two side blade surfaces, you can choose to re-grind one side of the blade surface or not re-grind the blade surface. For the blade body substrate with the original ground blade surface as the final blade surface, grind out the blade surface on the other side of the blade surface.

[0082] In the embodiment, the cross-sectional shape of the cutting edge includes but is not limited to: a V-shaped blade with a symmetrical angle, a V-shaped blade with an asymmetrical angle, a U-shaped blade, a hard blade, or a hard blade on one side and a V-blade on the other side; the cutting edge angle range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm.

[0083] In the embodiment, burrs will be present on the blade tip after the cutting edge of the tool is ground, and the burrs must be removed to achieve the purpose of smoothly cutting the object. The blade tip burrs can be removed by using a leaf leather wheel or a soft leather wheel plus polishing wax, a cloth wheel plus polishing wax, a cloth and linen wheel plus polishing wax, or by swinging the cloth back and forth, or by adding wax to the aforementioned various wheels to remove most of the burrs and then swinging the cloth, or even by using dry ice or liquid nitrogen to remove the burrs.

[0084] Step A6, finally, the blade body substrate with the blade surface ground can be selectively coated with other materials, or it can be left uncoated, thereby making an extremely sharp tool.

[0085] In the embodiment, the final tool surface includes but is not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coating surface, a CVD coating surface, or a selectively added painted, blackened, stone washed or sandblasted surface.

[0086] The manufacturing steps of the third type of tool are as follows: A blade base material with a rectangular cross-sectional shape is selected, and the blade base material is punched and heat-treated. The punching and heat-treatment processes are in accordance with the current industry conventional practices and are not limited.

[0087] The blade is first ground on one side. The ground side can be designed on the left or right side of the blade. The cross-sectional shape of the blade can be Fig.23 One of the shapes after grinding shown in the figure, the present technology includes but is not limited to Fig.23 The cross-sectional shape.

[0088] Then grind a single-sided small bevel, small concave, small convex, small blade surface or a double-sided small bevel, small concave, small convex, small blade surface. The cross-sectional shape of the small bevel, small concave, small convex, and small blade surface includes but is not limited to Fig.24 The position of the single-sided small bevel, small concave surface, small convex surface, and small edge surface on the left or right side of the blade can be exchanged.

[0089] Furthermore, after grinding small bevels, small concave surfaces, small convex surfaces, and small blade surfaces, the blade position can form a sharp blade tip and retain a small plane ≥ 0.1 mm, such as Fig. 22 As shown, but not limited to Fig. 22 shape.

[0090] Through PVD or CVD process, a high hardness film is plated on the blade surface. As long as the hardness of the outer wear-resistant layer of the high hardness film is higher than the hardness of the blade body, such as HV1000 or above, the hardness of the outer wear-resistant layer can reach HV1500 or above.

[0091] It is optional to add low-hardness PVD, painting, blackening, stone washing and other surface processes to the knife body after high-hardness film coating.

[0092] For blades with one original blade surface, grind out the other blade surface; for blades with two original blade surfaces, you can choose to re-grind one of the blade surfaces or not. For blades with the original ground blade surface as the final blade surface, grind out the blade surface on the other blade surface. The polishing method and surface brightness of the blade surface are as mentioned above, and are not limited by the current industry process. The preferred blade thickness is 0.1mm-0.3mm, the preferred blade angle is a wrap angle of 6-30°, and the preferred angle is a single-sided blade angle of 1°-16°. The cross-sectional shape of the blade surface, this technology includes but is not limited to Fig.11 , Fig.12 , Fig.13 One or more of .

[0093] Finally, the product can be selectively coated with other materials.

[0094] The final edge has two blade surfaces, one of which has a high hardness film layer attached to the surface, and the other has no high hardness film layer attached to the surface. Fig. 20 As shown; Or the two sides of the final cutting edge, both sides of the cutting edge surface are attached with a high hardness film layer, such as Fig.21 shown.

[0095] The biggest difference between the processes designed for the first type of tools and the second type of tools mentioned above is that the first type of tools are first coated with a high hardness film and then the blade surface is ground, while the second type of tools are first ground and then coated with a high hardness film.

[0096] Because the first type of cutting tools are coated with a high hardness film before grinding the blade surface, the furnace loading capacity is 12-25 times higher than that of the second type, and the qualified rate of finished products is more than 5 times higher. The manufacturing cost of the first type is 5 times or more lower than that of the second type. Moreover, after grinding the blade surface, you can still choose whether to coat the blade surface or perform other processes, which is more flexible in product process diversity.

[0097] The biggest difference between the processes designed for the above-mentioned first type of tools and third type of tools is that the first type of tools only grinds small bevels or small concave surfaces or small convex surfaces or opens small blade surfaces, and most of the blade surfaces are not ground. The blade surfaces are ground after being coated with a high-hardness film layer; while the third type of tools is based on the first type of tools, and one of the blade surfaces is ground before coating. After the high-hardness coating, this surface is no longer ground to avoid the risk of damage to the blade surface film layer during the grinding process after coating. However, the process flexibility is not as strong as that of the first type of blades. In summary, the present invention prefers the manufacturing method of the first type of tools.

[0098] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An extremely sharp knife, characterized in that: include: The blade body substrate has a blade portion, the surfaces on both sides of the blade portion are respectively a first blade face and a second blade face, and a film layer is attached to the first blade face or the second blade face, or both of the first blade face and the second blade face.

2. An extremely sharp knife according to claim 1, characterized in that: The first blade surface or the second blade surface is attached with a film layer by a PVD or CVD process.

3. A method for making an extremely sharp knife, characterized in that: include: Step S1, selecting a blade substrate with a rectangular cross-sectional shape; Step S2, grinding the first blade surface or grinding the two blade surfaces, and attaching a film layer to the first blade surface or the two edge blade surfaces through a PVD or CVD process; Step S3, then grinding the cutter body substrate into a trapezoidal cross section or other cross-section shapes to form a cutter face according to a conventional cutter manufacturing method; Step S4, after grinding the blade surface, selectively adding PVD, painting, blackening or stone washing surface processing to the blade surface; Step S5, grinding the blade surface of the blade body substrate with one blade surface to obtain another blade surface, and for the blade body substrate with two blade surfaces, re-grinding one blade surface or not re-grinding the blade surface, and grinding the blade surface on the other blade surface of the blade body substrate with the small inclined surface, small concave surface or small convex surface after the original grinding as the final blade surface; Step S6, finally, the blade substrate with the blade surface ground can be selectively coated with other materials to produce an extremely sharp tool.

4. The method for making an extremely sharp knife according to claim 3, characterized in that: In the step S1, the base material of the blade body is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel; In the step S2, the blade substrates are bundled and placed in a circular manner to be loaded into a furnace, or a single blade is placed in a circular manner to be loaded into a furnace to be coated; In the step S2, if only one blade face is selected to have a film layer, it is preferred to first form a single blade face for coating, and then process another blade face on the other blade face to form a final blade edge shape; In the step S2, a blade body made of other materials can be welded on the blade body substrate after the first blade surface is ground or the two blade surfaces are ground. The blade body material is one of martensitic stainless steel, austenitic stainless steel, ferritic stainless steel, duplex stainless steel, die steel, high-speed steel or heat-resistant steel; In the step S2, the film layer includes but is not limited to an outer wear-resistant layer of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti, TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; Among them, the hardness of the outer wear-resistant layer is higher than that of the base material of the cutter body; In step S3, the blade grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheels can be added to polish the surface; In step S5, the cross-sectional shape of the cutting edge includes but is not limited to: a V-shaped cutting edge with a symmetrical angle, a V-shaped cutting edge with an asymmetrical angle, a U-shaped cutting edge, a hard cutting edge, or a hard cutting edge on one side and a V-cut edge on the other side; the cutting edge angle range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm; In step S5, after the blade surface is ground, the blade tip is deburred, and the deburring treatment includes but is not limited to: a leaf-shaped leather wheel or a soft leather wheel with polishing wax, a cloth wheel with polishing wax, a cloth and linen wheel with polishing wax, a swinging cloth, dry ice or liquid nitrogen; In step S6, the final tool surface includes but is not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coating surface, a CVD coating surface, or a selectively added painted, blackened, stone washed or sandblasted surface.

5. A method for making an extremely sharp knife, characterized in that: include: Step T1, selecting a blade substrate with a rectangular cross-section, and grinding the blade substrate into a trapezoidal cross-section or other cross-section according to a conventional tool manufacturing method to form a blade surface; Step T2, selecting to first open a single-sided cutting edge, a double-sided cutting edge, or one of the cutting edges as the final cutting edge, and attaching a film layer to the surface of the cutting body substrate and the first cutting edge or both cutting edges through a PVD or CVD process; Step T3, on this basis, choose whether to selectively add PVD, painting, blackening or stone washing surface processing to the blade surface; Step T4, grinding the other blade surface of the blade body substrate with one blade surface, re-grinding one blade surface or not re-grinding the blade surface of the blade body substrate with the blade surface after the original grinding as the final blade surface, grinding the blade surface on the other blade surface; Step T5, finally, the blade substrate with the ground cutting edge can be selectively coated with other materials to produce an extremely sharp tool.

6. The method for making an extremely sharp knife according to claim 5, characterized in that: In the step T1, the base material of the blade body is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel; In step T1, the blade grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheels can be added to polish the surface; In the step T2, the furnace is loaded by a single hanging arrangement to perform coating; In the step T2, if only one blade face is selected to have a film layer, it is preferred to first form a single blade face for coating, and then process another blade face on the other blade face to form the final blade edge shape; In the step T2, the film layer includes but is not limited to an outer wear-resistant layer of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti, TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; Among them, the hardness of the outer wear-resistant layer is higher than that of the base material of the cutter body; In step T4, the cross-sectional shape of the cutting edge includes but is not limited to: a symmetrical V-shaped edge, an asymmetrical V-shaped edge, a U-shaped edge, a hard edge, or a hard edge on one side and a V edge on the other side; the cutting edge angle range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm; In step T4, after the blade surface is ground, the blade tip is deburred, and the deburring treatment includes but is not limited to: a leaf-shaped leather wheel or a soft leather wheel with polishing wax, a cloth wheel with polishing wax, a cloth and linen wheel with polishing wax, a swinging cloth, dry ice or liquid nitrogen; In step T5, the final tool surface includes but is not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coated surface, a CVD coated surface, or a selectively added painted, blackened, stone washed or sandblasted surface.

7. A method for making an extremely sharp knife, characterized in that: include: Step A1, selecting a blade substrate with a rectangular cross-section shape, first grinding the blade surface on one side of the blade substrate, and then grinding a single-sided small bevel, a small concave surface, a small convex surface, a small blade surface, or a double-sided small bevel, a small concave surface, a small convex surface, a small blade surface; Step A2, using PVD or CVD process to make one or both edge surfaces and the ground blade surface adhere to a film layer; Step A3, then grinding the cutter body substrate into a trapezoidal cross section or other cross sections to form a cutter face according to a conventional cutter manufacturing method; Step A4, after grinding the blade surface, selectively adding PVD, painting, blackening or stone washing surface processing to the blade surface; Step A5, grinding the blade surface of the blade body substrate with one blade surface to obtain another blade surface, and for the blade body substrate with two blade surfaces, re-grinding one blade surface or not re-grinding the blade surface, and grinding the blade surface on the other blade surface of the blade body substrate with the blade surface after the original grinding as the final blade surface; Step A6, finally, the blade substrate with the ground cutting edge can be selectively coated with other materials to produce an extremely sharp tool.

8. The method for making an extremely sharp knife according to claim 7, characterized in that: In the step A1, the base material of the blade body is one of martensitic stainless steel, tungsten steel, duplex stainless steel, die steel, high speed steel or heat resistant steel; In the step A2, the blade substrates are bundled and placed in a furnace in an outward circular arrangement, or a single blade is placed in a furnace in an outward circular arrangement, or a single blade is placed in a furnace in a hanging arrangement, and the coating is performed; In step A2, if only one blade face is provided with a film layer, it is preferred to first form a single blade face for coating, and then process the other blade face to form another blade face, thereby forming the final blade edge shape. In the step A2, the film layer includes but is not limited to an outer wear-resistant layer of ta-C, CrwCC, TiSiN, TiAlSiXN, AlCrN, Ti, TiB2, TiN, CrN, DLC, ADLC, ZrN, ZrCN, TiN-TiCN-TiN, TiCN-TiC-TiN, CrAlBN, TiAIN, CrAlSiN, TiSiC, TiC and CrNC; Among them, the hardness of the outer wear-resistant layer is higher than that of the base material of the cutter body; In step A1 or step A3, the blade surface grinding method includes but is not limited to: The surface is roughened with a magnesia grinding wheel and polished with a rubber wheel; Resin grinding wheel for rough grinding and rubber wheel for polishing the surface; The resin grinding wheel directly grinds the surface; Or CBN grinding wheel grinding surface; On the basis of grinding and polishing, nylon wheels, sanding belts or cloth wheels can be added to polish the surface.

9. The method for making an extremely sharp knife according to claim 7, characterized in that: In step A5, the cross-sectional shape of the cutting edge includes but is not limited to: a symmetrical V-shaped edge, an asymmetrical V-shaped edge, a U-shaped edge, a hard edge, or a hard edge on one side plus a V-shaped edge on the other side; the cutting edge angle range is: 6°-32°, the single-sided cutting angle is: 1°-16°; the cutting edge thickness range is: 0.1mm-0.3mm; In step A5, after the blade surface is ground, the blade tip is deburred, and the treatment methods include but are not limited to: a leaf leather wheel or a soft leather wheel plus polishing wax, a cloth wheel plus polishing wax, a cloth plus linen wheel plus polishing wax, a reciprocating cloth, dry ice or liquid nitrogen.

10. The method for making an extremely sharp knife according to claim 7, characterized in that: In step A6, the final tool surface includes but is not limited to a laser light surface, a brushed surface, a sanded surface, a mirrored surface, a subsequently added PVD coating surface, a CVD coating surface, or a selectively added painted, blackened, stone washed or sandblasted surface.

Images