KR20090085943A - Method of manufacturing a knife with high hardness nitride layer - Google Patents

Abstract

A method of manufacturing a knife having a high hardness nitride layer is provided to improve cutting performance and antibacterial and antiseptic properties of a knife by coating the knife body of carbon or alloy steel with nitride and cupric oxide. A method of manufacturing a knife having a high hardness nitride layer is as follows. A steel sheet is processed into a knife body(1). The knife body is subjected to quenching and surface grinding. The knife body is polished to form a blade tip and then finish the blade tip. A surface nitriding process including heating at the temperature below 600‹C is performed on the knife surface in order to form a high hardness nitride layer(2) having a thickness of 10~100mum and Vickers hardness over 1000.

Description

METHODS OF MANUFACTURING A KNIFE WITH HIGH HARDNESS NITRIDE LAYER

The present invention relates to a method for manufacturing a knife having a high hardness nitride layer, and more particularly, to a high hardness by coating a high hardness nitride layer on a knife processed by a conventional method, and to provide an antimicrobial silver oxide and a copper oxide layer. It relates to a knife having a cutting edge in at least a portion of the coating.

Knives such as kitchen knives, knives, scissors, cutters, hand axes, sickles, razor blades, saws, axes, carving knives, routers, chisels, round blade cutters, and square cutters, which have at least a portion of the cutting edges, are generally for household use. It is widely used for business purposes in various industries, and various kinds and materials are developed and used in various fields, and it is useful for all life and work.

However, in general carbon steel and alloy steel knives, the hardness of the blade tip or the knife main body is obtained by heat quenching and hardening of the carbon containing the main element, but the upper limit of the hardness that can be obtained is HRC value of about 64, that is, Hv value of 800 or less. As a result, the durability of the cutting ability is short, the cutting holding performance is difficult to exhibit sufficient ability, and when the cutting ability is low, grinding work by grinding wheel is required every time, Few assumptions have been made, and the situation has not been achieved even in long-term improvement studies for high cutting holding performance.

In addition, for forming this kind of nitride film, for example, the austenitic bulk material made of an aggregate of austenite nanocrystal particles containing 0.1 to 2.0% (mass) of the solid solution nitrogen disclosed earlier, wherein each of the nano As a grain growth inhibiting substance, a metal or semimetal oxide, nitride, carbide, etc. exist in between the particle | grains of crystal grains, and / or inside the same particle (refer patent document 1), or as a chemical composition (mass%) 0 <C≤0.08, 0≤Si <0.50, 0≤Mn≤1.50, 15≤Cr≤30, 0≤Ni <0.05, 1≤Mo≤10, 1.00 <N≤2.00, 0≤Ca <0.005 The balance is made of Fe and unavoidable impurities, and the contents of Cr, Mo, and N each have a corrosion resistance index indicated by a formula including Cr, Mo, and N, the share of the area of nonmetallic inclusions in steel, and the maximum diameter of nonmetallic inclusions in steel. Chemical composition and ratio satisfying the relationship with Characterized by having the properties of cleaning in inclusions and the like to the corrosion resistance, strength, formability and abrasion resistance, a high nitrogen stainless steel does not have excellent nickel (see Patent Document 2) it is disclosed.

[Patent Document 1: Japanese Patent Application Laid-Open No. 2004-137600]

[Patent Document 2: Japanese Patent Application Laid-Open No. 2007-51368]

On the other hand, blades using zirconium ceramics, which have been widely used in recent years, have a hardness of 1200 or more Hv and have high cutting retention performance, and have gained support, but have been used for limited purposes because they have inferior toughness values compared to metal knives. Although conventionally used carbon steel and alloy steel knives are required, there is a problem with high cutting retention performance, and as described in Patent Document 1 and Patent Document 2, although surface nitriding treatment is performed, carbon steels widely used, It does not require high cutting holding performance for alloy steel knives.

As a result of earnestly researching in view of the said subject, the 1st aspect of the manufacturing method of the knife provided with the high hardness nitride layer of this invention is a process of processing the metal steel plate to the outer shape of the knife main body which has a cutting edge in at least one part. And a step of hardening the knife body processed into the outline shape, a step of surface grinding the knife body subjected to the hardening treatment, a step of forming a blade tip and polishing on the knife body subjected to the surface grinding process, A surface nitriding process including a heating process of 600 ° C. or less is performed on the surface of the knife body subjected to the blade edge finishing polishing process, and the knife body manufactured through the step of the blade edge finishing polishing process. And forming a high hardness nitride layer having a Vickers hardness Hv value of 1000 µm or more and a thickness of 10 µm or more and 100 µm or less.

According to a second aspect of the present invention, the method of claim 1, further comprising a step of performing final polishing and polishing after the step of forming the hardened layer.

According to the third aspect of the present invention, the aqueous solution of an inorganic copper salt compound containing copper nitrate, copper sulfate, or copper chloride and silver nitrate are used in the knife body subjected to the final blade forming finish polishing process according to claim 2, 450 degrees C or more after immersing the said knife main body in each aqueous solution of the aqueous solution of the inorganic silver salt compound containing silver bromide, or the mixed liquid of both these aqueous solutions, or apply | coating the said aqueous solution or the mixed solution of both these aqueous solutions to the said knife main body, The antimicrobial oxidation formed by heating and sintering by means of superimposing a copper oxide film is formed.

The knife manufacturing method provided with the high-hardness nitride layer of this invention can be utilized in the field of the manual cutting machine for general household or business use, and it is conventionally manufactured in large quantities, and can be obtained easily carbon steel type and alloy steel Knife provided with a high hardness nitride layer, which has a high hardness nitride layer having a thickness of 10 μm or more and 100 μm or less on the surface by performing surface nitriding on a knife body processed with a system. By further providing a solid film by sintering the copper oxide film on the surface, it has antibacterial, bactericidal and mold resistance properties, and can provide a knife excellent in hygienic function as well as high cutting retention performance. Practical invention is high.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an embodiment of a knife manufacturing method with a high hardness nitride layer of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a knife of an embodiment of a knife manufacturing method with a high hardness nitride layer of the present invention. 2 is a cross-sectional view of the knife of the next example of the method for producing a knife with a high hardness nitride layer of the present invention.

TECHNICAL FIELD The present invention relates to a method for producing a knife having a high hardness nitride layer, and more particularly, a high hardness nitride layer is coated on a knife which has been conventionally manufactured to have a high hardness, and antimicrobial silver oxide is a copper oxide layer. The knife which has the cutting edge in at least one part which coat | covered the above, The manufacturing method of the knife provided with the high hardness nitride layer of Claim 1 is the knife main body 1 which has a cutting edge in a metal steel plate at least one part. The process of processing to an external shape, the process of hardening hardening the knife main body 1 processed into the said external shape, the process of surface-grinding the knife body 1 which processed the said hardening hardening, and the said surface grinding process The knife bone manufactured and processed including the process of blade-finish-polishing on the knife main body 1, and the process of further blade-finish-polishing the blade main body 1 which performed the said blade-form-polishing process. Surface nitriding processing including the heating process of 600 degrees C or less is performed to the surface of (1), the high hardness nitride layer 2 or more of Vickers hardness Hv value 1000 or more of thickness of 10 micrometers or more and 100 micrometers or less is formed, and the said high hardness nitriding is carried out. It is the knife which formed and processed the layer (2).

Invention of Claim 2 is the knife provided with the high hardness nitride layer which further comprises the process of final-finish-finish-polishing-process after the process of forming the said hardened layer.

Moreover, the manufacturing method of the knife provided with the high hardness nitride layer of Claim 3 is a manufacturing method of the knife provided with the high hardness nitride layer of Claim 1 WHEREIN: The said final blade forming finish grinding process was performed, and it processed. 450 degreeC after immersing in the mixed solution of the aqueous solution of the inorganic copper salt compound containing copper nitrate, copper sulfate, or copper chloride, and the aqueous solution of the inorganic silver salt compound containing silver acetate or silver bromide, or apply | coating the mixed liquid to the knife main body 1, The antibacterial oxidation formed by heating and sintering at the above temperature forms the copper oxide film 3.

EXAMPLE

That is, the knife manufacturing method provided with the high hardness nitride layer 2 of this invention manufactures the knife main body 1 processed by the manufacturing means currently performed by the knife manufacture of the world, ie, in external shape. The process of processing forms the metal steel plate which is a base material of SUS alloy carbon steel, carbon steel alloy steel, and nitride steel alloy steel as the knife main body 1 of the objective which has a cutting edge in at least one part by means of press working, etc., The knife main body 1 is a kitchen knife, a knife, scissors, a cutter, a hand axe, a sickle, a razor, a saw, an axe, a carving knife, a router, a chisel, a round blade cutter, and a square blade cutter.

Next, the quench hardening treatment step is carried out by heating and quenching in order to harden the knife main body 1 processed to an external shape, and by this process, the knife main body 1 hardens to Hv 800 or less by the maximum value of a Vickers value.

Subsequently, the surface grinding processing step is to form the blade body in at least a part of the blade body 1 to be hardened and hardened by a grinding device such as a grinder to form the blade of the above object. Grinding is performed on the part to facilitate the process described later.

Moreover, in order to form a sharp blade edge | tip in the knife main body 1 which performed the surface grinding process, the blade edge | tip grinding | polishing machining process is grinding | polishing of blade edge | tip formation with a grinding | polishing apparatus, such as a rough grinding wheel.

In addition, a blade edge finishing polishing process forms the surface of a sharp and smooth blade edge | tip by a grinding | polishing apparatus, such as a finishing grinding wheel, further on the blade edge | tip of the blade main body 1 which performed the said blade edge forming grinding process.

As described above, the knife main body 1 manufactured and processed as described above is roughly equivalent to that widely used in general households and various industries, but surface nitriding is performed on the surface of the processed knife main body 1. In order to form the high-hardness nitride layer 2, surface nitriding is performed by well-known means, such as a plasma method, a salt bath method, a sulfide gas method, and an ion method.

The high hardness nitride layer 2 is a thin film having a thickness of 10 μm or more and 100 μm or less. As shown in FIG. 1, when the thickness A of the high hardness nitride layer 2 is 10 μm, the processed knife body is processed. The thickness B of the high-hardness nitride layer 2 of the leading edge of (1) consists of 20 micrometers, and the hardness of the high-hardness nitride layer 2 is Vickers hardness value Hv value 1000 or more, ie, the processed knife main body ( By forming the high hardness nitride layer 2 on the surface of 1), it becomes a knife provided with high cutting holding performance.

In addition, in the following example of the knife manufacturing method provided with the high hardness nitride layer, the antibacterial silver oxide and copper oxide film 3 was formed on the processed knife body 1 subjected to the above-described final blade forming finish polishing process. will be.

That is, the processed knife body 1 with the high hardness nitride layer 2 is made of an aqueous solution of an inorganic copper salt compound containing copper nitrate, copper sulfate or copper chloride, and an inorganic silver salt compound containing silver nitrate or silver acetate or silver bromide. After immersing in a mixed solution with an aqueous solution or applying the mixed solution to the processed knife body 1, the mixture is heated and sintered at a temperature of 450 ° C. or higher.

[Industry availability]

The method of manufacturing a knife having the high hardness nitride layer of the present invention can be used in the field of manual handicrafts for general home use or business purposes, and has been conventionally manufactured in large quantities and readily available in carbon steel and alloy steel systems. The surface of the knife body is subjected to surface nitriding, so that the surface is provided with a high-hardness nitride layer, which is a knife having high cutting retention performance, and further sinters the silver oxide and copper oxide films on the surface of the knife provided with the high-hardness nitride layer. By providing it as a firm film by formation, it has antibacterial, bactericidal, and mold-resistant properties, and can provide a knife excellent in hygienic function as well as high cutting holding performance.

1 is a cross-sectional view of a knife of an embodiment of a knife manufacturing method having a high hardness nitride layer of the present invention.

Figure 2 is a cross-sectional view of the knife of the next embodiment of the knife manufacturing method with a high hardness nitride layer of the present invention.

<Description of the symbols for the main parts of the drawings>

1: knife body

2: high hardness nitride layer

3: silver oxide, copper oxide film

Claims (3)

Processing a steel sheet made of metal into an outer shape of a knife body having a cutting edge at least partially; Quenching and hardening the knife body processed into the external shape; Surface grinding the knife body subjected to the hardening hardening treatment; A step of forming a blade tip and polishing on the knife body subjected to the surface grinding, A step of further finishing cutting the blade body of the knife body subjected to the blade forming and polishing processing; A surface nitriding process including a heating step of 600 ° C. or less is performed on the surface of the knife body subjected to the blade finishing polishing process to form a high hardness nitride layer having a Vickers hardness Hv value of 1000 μm or more and 100 μm or less. A method of producing a knife having a high hardness nitride layer comprising a. The method according to claim 1, A method for producing a knife having a high hardness nitride layer, further comprising a step of final blade forming and polishing after the step of forming the high hardness nitride layer. The method according to claim 2, Each aqueous solution of an aqueous solution of an inorganic copper salt compound containing copper nitrate, copper sulfate, or copper chloride, and an aqueous solution of an inorganic silver salt compound containing silver nitrate, silver bromide, or the like on a knife body subjected to the final blade forming finish polishing process, or The antimicrobial silver oxide film formed by immersing the said knife main body in the mixed liquid of both these aqueous solutions, or apply | coating each said aqueous solution or the mixed liquid of these both aqueous solutions to the said knife main body, and heat-sintering at the temperature of 450 degreeC or more is formed. Method of manufacturing a knife provided with a high hardness nitride layer, characterized in that the overlap.

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