KR20130016831A - Bronze knife, and its manufacturing method - Google Patents

Abstract

PURPOSE: A bronze knife having enhanced abrasion resistance and a manufacturing method thereof are provided to offer a multistep process for completing a blade of the knife from a multi-sheet, thereby obtaining sharp edge of the knife and enhancing sterilization effect. CONSTITUTION: A manufacturing method of a bronze knife comprises a pure bronze casting step of mixing and melting 78% copper and 22% tin for obtaining pure bronze an ingot(10); a rolling step of hot rolling and stretching the pure bronze ingot for obtaining a pure bronze sheet(20); a multi-sheet producing step of tempering and stacking at least two the pure bronze sheets by repeating forging and rolling for obtaining a pure bronze multi-sheet(30); a blanking step of forming the shape and size of a desired pure bronze knife(40) from the pure bronze multi-sheet; a blade shaping step of forging thinly the portion for blade of the pure bronze knife obtained from the blanking step; a heat treatment step of heating and tempering the back(42) of the knife having blade obtained from the blade shaping step; a handle combining step of combining a handle(45) of a knife to the pure bronze knife obtained from the heat treatment step; and a blade completing step of grinding the blade portion of the pure bronze knife for completing the blade.

Description

Bronze knife, and its manufacturing method

The present invention relates to a bronze knife and a method for manufacturing the same, and more particularly, a material in which a plurality of layers are joined by drawing bronze alloyed with copper and tin to form a single thin blade to maintain sharp blades in multiple stages. In addition to maintaining, as well as harmless to the human body, excellent sterilization, excellent sterilization, sterilization, utilizing the characteristics of disinfection knives, kitchen knives, transients, razor blades, surgical knives, etc. to make and use.

Copper is naturally used as a metal, and since the smelting method is a relatively simple metal, it was used before any metal.

In other words, they were excavated in the ruins of Egypt, Babylonia, and Assyria, and formed the so-called synchronous period following the Stone Age.

After that, bronze, an alloy with tin, was made, forming the age of human culture as a bronze age.

In the Middle Ages, bronze, along with the invention of church paper, ornaments, and the invention of gunpowder, were also cast into cannons, but production was low, only 9000 tons worldwide.

Entering the Industrial Revolution, copper was used in large quantities as a machine material along with iron. As the use of electricity increased from the end of the 19th century, the demand for electric materials including wires increased rapidly.

With the advancing of modernization of mining and smelting in the 20th century and the development of processing technologies such as rolling mills and drawing machines, copper has gained a firm position in the modern industry.

Brass (Brass) is a non-ferrous metal of 65% Cu (copper) and 35% Zn (zinc). It has high toughness and strength.

It is a Cu-Zn-based alloy, and it used to be called brass.

Up to 35% Zn (zinc) is called α-brass. If the amount of Zn (zinc) is greater than that, β-phase appears and becomes α + β 2-phase tissue.

7-3 (70 ~ 30) brass of α single phase structure has very good deep drawing property, and 6-4 (60 ~ 40) brass of α + β two phase structure has hot workability due to low deformation low pressure of β phase at high temperature. great.

Pb (lead) with 1 ~ 3% Pb (lead) added to 60 ~ 40 brass has good machinability because Pb, which is not dissolved during cutting, acts as a lubricant.

Rubbing brass with selenium or tellurium is also available. Special brasses with improved corrosion resistance and strength by adding Mn (manganese), Sn, Fe (iron), Al (aluminum) and Ni (nickel) to ordinary brass There is brass.

Brass is an alloy of copper and zinc, which is hard and workable, and has been important since ancient times.

The first brass, dating back to the Neolithic period, is called calamine brass, apparently made from a mixture of zinc and copper minerals.

In the Bible and other ancient writings, the term brass was also used to refer to bronze, an alloy of copper and tin.

The properties of brass can not be processed at both high and cold conditions when the content is less than 55%, depending on the copper content.

Known as white brass, it is of little value for industrial use, but coarse particles are often the main component of alloys used for soldering or die-casting.

The malleable brass (containing 62% or more copper) is divided into two parts, which can be processed even in the cold state like Dutch gold leaf, and Muntz metal (alloy of zinc 4 and copper 6) which must be worked at high temperature. Among them are α brass, which is widely used to make pins, screws, and screws.

β-brass contains a small amount of zinc, so its malleability is small but harder, making it better for faucet handles, sprinkler heads, glass and door fixtures, and other fixtures.

Other brasses include mixtures of copper and zinc in addition to physical and mechanical properties, corrosion resistance, machinability, and color variations.

Among them, aluminum brass is highly resistant to corrosion, and lead brass is easily machined.

Small amounts of tin in the brass used for ships enhance the resistance to corrosion caused by sea water, while silver is added with nickel to give a white or silvery color.

The Romans used brass mainly to make vessels, armor, jewelery, brooches and clamps, and brass products were revived during the Carolinger era after production declined after Rome withdrew from Northern Europe.

Brass, which is more malleable than bronze, was used to make a large bottle of water and many household items such as cups, lamps, bowls, and kettles.In the 16th century, before silver was poured from America into Europe, brass heads and plates were used to decorate middle class families With great popularity.

Brass is a traditional metal field that our ancestors used to make various containers and utensils. Since brass was artificially manufactured from bronze and an important copper alloy, it was discovered after zinc element was discovered around 1520.

Brass is an alloy of 78% copper (Cu) and 22% tin (Sn).

Organic, also known as brass, was widely used in clothing, weapons, and everyday containers from the Bronze Age to the modern age.

In the 8th century, Cheol Yujeon, a government office dedicated to organic production, was installed. In the Goryeo Dynasty, Buddhist crafts as well as various living containers were produced with high-level technology.

Since the early Joseon Dynasty, mining of copper has been promoted in the country, and whey has been categorized into private and state-owned factories of light and foreign factories to meet the demands of the courts and government offices. Especially in the Joseon Dynasty, when ceramic ceramics were common, it was common to use organic materials with excellent thermal insulation in comparison with ceramics in winter.

Organic is divided into copper and zinc alloyed copper and tin mixed with copper, which is an important factor that distinguishes both fabrication techniques and uses of materials.

In other words, cast copper is made of die-casting technique, and zinc, an alloy material, is toxic and used to make incense burners, candle holders, and ashtrays, except for tableware. Used to make

The former is called casting organic, and the latter is called organic.

The casting organic process is relatively simple, but the room finishes each process based on the tight organizational power of 11 well-trained organic farms.

In particular, Bangjakgi is a representative organic production technique that flourished mainly in Ancheong province, Napcheong, and Hamyang, and worked mainly at night with low noise to detect the temperature of the flame and to select the sound rate of traditional percussion instruments.

The kettle's snout is narrower than the body, making it difficult to make castings, such as the half-weaving technique that combines casting and weaving techniques.

In other words, the body was made by casting technique and only forged parts were needed.

After casting or weaving, both molds are hanged on a grind and finished by smoothing the surface. Yujangjang was designated as an Important Intangible Cultural Property No. 77 in 1983, and is a musical and artistic bearer. have.

Generally, bronze is an alloy made of 78% of copper and 22% of tin in weight ratio, and it is widely used as a container and a living tool closely related to various eating habits in the name of brass or salty organic since it is harmless to human body. Has been.

Bronze-organized bowls have been shown to have a bactericidal effect as well as the ability to respond to toxic substances to enhance the taste of food as well as to keep fresh longer than normal refrigeration when stored with lettuce or vegetables. According to the report, brass eliminates 99.9% of food poisoning bacteria and "200 liters of fish put brass plates (30cm long x 30cm), which is the material of brassware or brass cutlery, in fish. 99.9% of the bacteria were removed and 90% of Vibrio bacteria in shellfish also disappeared after 48 hours. ”

Bronze organic products are alloys in which copper and tin are mixed at a ratio of 78:22. Particularly in the case of salty organics, when the alloy ratio is different or impurities are mixed, the process of tapping the primary molding into a desired shape occurs. On the other hand, there have been cases where the hardness is weak and the product does not meet the standards required.

Considering the alloy characteristics of the bronze organic compounds when manufacturing the organic cotton by mixing the high quality copper and tin in the correct ratio, the vessels and general household equipment, etc. mostly satisfied the quality standards.

Patent application No. 10-2009-0065894 (2009.07.20) maintains cutting force and abrasion resistance while maintaining a moderate hardness on the blade by mixing a small amount of non-metallic phosphorus (Phosphorus) with bronze alloyed with copper and tin. The present invention relates to a bronze organic knife and a method for manufacturing the same, wherein the blade which comes into contact with food is made of a non-toxic, odorless, non-polluting metal to improve hygiene. Pure copper 78% 0.7 kg to 16 g of phosphorus, a nonmetallic compound, was dissolved in 1 kg of an alloy containing 22% tin and tin, and then rolled and forged in the form of a knife as in the conventional spinning process. By completing the manufacture of the, it is to reduce the wear of the blade and to prevent damage caused when the blade is too hard. A mixture of 78% copper and 22% tin was obtained to obtain an alloy, followed by dissolving phosphorus, which is a nonmetallic compound, at a ratio of 0.7 to 16 g per 1 kg of the alloy. ; The base material of the alloy ingot form a first processed product to be the basic form of a knife after at least one hot rolling process, the first processed product is the desired shape after imparting the characteristics of the organic cotton through the forging process in the hot state Processing to become a knife of the second step of making a finished product having the final shape of the knife; The secondary workpiece is a heat treatment process that is cooled in a heated state to ensure that the structure of the alloy is dense and hardened to have mechanical properties, and then to finish the knife through the polishing process to erect the blade is a bronze organic knife It is a manufacturing method of.

Quenching: [Source] Naver Encyclopedia It was also called quenching in the past by an operation of suppressing a change occurring inside a metal or an alloy by quenching and maintaining a stable state or an intermediate state at a high temperature in a low temperature / greenhouse. In English, quenching is used extensively to prevent not only cooling but also abrupt changes caused by elevated temperatures. Originally, this refers to the operation of heating steel to an austenite (γ phase) and quenching it in water or oil to stop the change to pearlite to obtain a quenched structure. Jersey is used to mean. Therefore, since the change is prevented and hardened even without excessively quenching, it is not necessary to quench rapidly in the quenching of a wide meaning. In addition, in steel, some changes from high temperature to low temperature are prevented by quenching, so that it becomes a very hard structure such as martensite. Therefore, it is easy to think that other alloys are always hardened by quenching. not. In an age hardening alloy or the like where the change to low temperature is completely prevented, the quenching state becomes the softest state in the alloy, for example, duralumin and beryllium copper. Forging: [Source] The Next Encyclopedia In metallurgy, the process of forming and increasing toughness by tapping or applying metal. In most forgings, the heated material on a fixed lower die is compressed into an upper die. The process of dropping the hieroglyph or hammer is known as drop forging. The weight may be increased by power to increase the inertia. The number of strikes applied is carefully modified by the operator to minimize wear of the mold and to achieve the maximum forging effect. In high-speed operations that do not require the heavy impact of dropping hammers, the old blacksmith's technique, called forge-hammer, is used. Inertia is transmitted by the movement of large hand hammers to handles. Sack hammers are usually used for preliminary and finishing operations. Forging presses use hydraulic or mechanical pressure instead of tapping forging. Most forging presses can only exert pressures of several hundred tons, while large presses used for forging jet parts can exert pressures of up to 50,000 tons (→ hydraulic presses). Several other forging processes are also used. In roll forging, a metal plate (金 屬 素 板: annular material cut or cut for press work) is passed between a pair of rotating rolls engraved on the surface. Impact forging is essentially like hammer forging in that the upper and lower dies move horizontally to access the material. Ascending forging is similar to impact forging except that the mold approaches vertically. The last two methods have the major advantage that the two molds absorb energy from each other, eliminating the need for a heavy pedestal.

However, when manufacturing a kitchen knife for treating food with bronze under the above conditions, since the hardness of the knife was weak, it was difficult to sharply process the blade, and there was a problem in that the function of the knife could not be properly exhibited due to its very weak wear resistance.

In addition, Patent Application No. 10-2009-0065894 (2009.07.20) is a method of changing the use of a knife that is not organic by carrying out the conventional method of producing an organic by a conventional phosphor bronze casting method as it is, Since the wear resistance of the blade was not sufficiently improved, there were many problems in manufacturing a kitchen knife for realistically cooking food or cutting fruit.

Accordingly, the present invention is to provide a bronze knife and a method of manufacturing the same by drawing the bronze and heat-treated in a special way to complete the knife, giving the wear resistance while maintaining the properties of the alloy to satisfy the hardness of the kitchen knife.

Pure bronze (brass) casting process of melting and mixing 78% copper and 22% tin to obtain pure bronze; A rolling step of hot rolling and stretching pure bronze (brass) obtained in the pure bronze (brass) casting process; Pure bronze (brass) composite plate production obtained by quenching the expanded pure bronze (brass) by rolling in the rolling process and overlapping at least two or more layers and repeating forging and rolling every time to obtain a pure bronze (brass) composite plate integrally bonded. Process; Pure bronze (brass) knife blanking step of obtaining the pure bronze (brass) composite plate obtained in the pure bronze (brass) composite plate manufacturing step by the size and shape of the knife to be manufactured; A handle forming step of integrally forming a handle of the pure bronze (brass) knife obtained in the pure bronze (brass) knife blanking process and engraving various patterns on the handle; A blade forming step of forging a thin portion of a pure bronze (brass) knife formed by engraving a pattern on a handle integrally formed with a pure bronze (brass) knife in the handle forming step to form a blade; A heat treatment step of heating and quenching the pure bronze (brass) knife formed by cutting the blade in the blade forming step by heating a knife back portion opposite to the blade; A blade completion step of completing the blade by polishing the blade portion of the pure bronze (brass) knife heat-treated in the heat treatment step; a plurality of blades as a pure bronze (brass) plate combined with multiple layers of copper to form a step from the blade end In this combined state, a bronze knife is formed to form a blade so that you can obtain a bronze knife that maintains the properties of the alloy and is always sharp and does not lose its function.

Bronze knife obtained by carrying out the method of producing a bronze knife of the present invention is composed of a multi-layered material is composed of a plurality of layers in a single blade to maintain a sharp blade, as well as alloyed only with copper and tin It is composed of pure bronze, which is not harmful to the human body, and has excellent sterilization effect, and it improves the hardness of the blade by special heat treatment method, and various bronzes such as knife, kitchen knife, transient blade, surgical blade, etc. It is a novel invention with excellent effects such as making and using a brass knife.

1 is a process illustration for the practice of the present invention.
Figure 2 is a process illustration for another embodiment of the present invention.
Figure 3 is a modified example of the material according to the process of the present invention.
Figure 4 is an enlarged plan view showing the configuration of a blade obtained by the practice of the present invention.
Figure 5 is an enlarged side view showing the configuration of a blade obtained by the practice of the present invention.

The working process for carrying out the present invention and the pure bronze (brass) knife obtained thereby will be described with reference to Examples.

Example 1

Pure bronze (brass) casting process;

78% copper and 22% tin are melted to obtain an ingot 10 made of pure bronze.

Rolling process;

The pure bronze (INGOT) 10 obtained in the pure bronze casting process is hot rolled to increase the length of the pure bronze.

Pure bronze (brass) composite plate manufacturing process;

The pure bronze (brass) plate 20 stretched by rolling in the rolling process is quenched, and forging and rolling are repeated each time while overlapping at least two or more layers to obtain the pure bronze (brass) composite plate 30.

At this time, the more the pure bronze (brass) plate 20 is increased by rolling the effect is excellent, but the most ideal is 8 or more layers are appropriate.

And the more forging and rolling, the higher quality pure bronze (brass) composite plate 30 will be obtained.

Hot forging is ideal, but even if cold forging will not be beyond the scope of the present invention.

Here, the pure bronze (brass) composite plate 30 is formed in a square or a certain size or to form a long, so depending on the working method will not depend on the shape of the scope of the present invention will extend to any shape.

Pure bronze (blank) knife blanking process;

The pure bronze (brass) composite plate 30 obtained in the pure bronze (brass) composite plate manufacturing process is cut out in the size and shape of a knife to be manufactured by using a machine tool such as a press.

Blade forming process;

The pure bronze (brass) knife 40 obtained in the pure bronze (brass) knife blanking step is formed by forging only a portion to form the blade 41 to form a thin blade 41.

At this time, the forging is ideal, even if cold forging is carried out will not deviate from the scope of the present invention.

Heat treatment process;

In the blade forming process, the pure bronze (brass) knife 40 formed by cutting the blade is heated and quenched by heating a portion of the blade back 42 opposite to the blade 41, so that the blade 41 maintains strength and moves toward the blade back 42. By forming a knife that is gradually softened, the blade 41 is not easily worn or crushed, as well as preventing from being broken by an impact.

Hilt;

The hilt 45 is coupled to the pure bronze (brass) knife 40 heat-treated in the heat treatment step.

Blade completion process;

The blade 41 of the pure bronze (brass) knife 40 combined with the hilt 45 in the hilt handle process to complete the blade 41.

At this time, the blade 41 is formed as a plurality of pure bronze (brass) plate 20 is integrally bonded as shown in Figure 4 made of a pure bronze (brass) composite plate 30, as shown in Figure 5 In addition to the sharp edge of the blade 41 by forming a pure bronze (brass) plate 20 step by step from the edge to the inner side, the blade 41 has abrasion resistance that is not easily damaged or worn Will be.

That is, the pure bronze (brass) composite plate 30 maintains a state in which it is integrally bonded to each other, but when it is heated again, each pure bronze (brass) plate 20 is separated and falls into the first ingot 10. The individual pure bronze (brass) plates 20 cast by each have their boundaries and become thinly deformed.

  Pure bronze (brass) knife 40 completed by the above-described method is a combination of at least two or more pure bronze (brass) plate 20, a mixture of 78% copper and 22% tin, forged integrally forging a plurality of layers The pure bronze (brass) plate 20, which is integrally combined, forms a blade (41) in a state of pure bronze (brass) composite plate (30) in which a plurality of blades are combined while forming a step from the edge of the blade. Any knives such as excessive blades, razor blades, surgical knives, etc. will function as pure bronze (brass) knives utilizing the characteristics of sterilization and disinfection.

Example 2

Pure bronze (brass) casting process;

78% copper and 22% tin are melted to obtain an ingot 10 made of pure bronze.

Rolling process;

The pure bronze (INGOT) 10 obtained in the pure bronze casting process is hot rolled to increase the length of the pure bronze.

Pure bronze (brass) composite plate manufacturing process;

The pure bronze (brass) plate 20 stretched by rolling in the rolling process is quenched, and forging and rolling are repeated each time while overlapping at least two or more layers to obtain the pure bronze (brass) composite plate 30.

At this time, the more the pure bronze (brass) plate 20 is increased by stacking the effect is excellent, but the most ideal is 8 or more layers are appropriate.

And the more forging and rolling, the higher quality pure bronze (brass) composite plate 30 will be obtained.

Hot forging is ideal, but even if cold forging will not be beyond the scope of the present invention.

Here, the pure bronze (brass) composite plate 30 is formed in a square or a certain size or to form a long, so depending on the working method will not depend on the shape of the scope of the present invention will extend to any shape.

Pure bronze (blank) knife blanking process;

The pure bronze (brass) composite plate 30 obtained in the pure bronze (brass) composite plate manufacturing process is cut out in the size and shape of a knife to be manufactured by using a machine tool such as a press.

Handle molding process;

The handle 45 portion of the pure bronze (brass) knife 40 obtained in the pure bronze (brass) knife blanking step is processed to form the handle 45 integrally.

At this time, the handle 45 made of pure bronze (brass) may be separately joined.

Handle decoration process;

In the handle molding process, various patterns 46 are carved on the handle 45 integrally formed with the pure bronze (brass) knife 40.

At this time, carving the pattern 46 is said to be applicable to all the methods of carving the pattern on the metal, so the method and shape will not be limited in particular, and all the patterns and shapes will be within the scope of the present invention.

Blade forming process;

In the handle decoration process, the pure bronze (brass) knife 40, which is formed by carving a pattern on the handle 45 integrally formed with the pure bronze (brass) knife 40, is forged only thinly to form a blade 41. To form a blade (41).

At this time, the forging is ideal, even if cold forging is carried out will not deviate from the scope of the present invention.

Heat treatment process;

In the blade forming process, the pure bronze (brass) knife 40 formed by shaping the blade 41 is heated and quenched by heating a portion of the blade back 42 opposite to the blade 41 so that the blade 41 maintains strength and the blade back ( 42) By forming a pure bronze (brass) knife 40 to the ductility toward the side, the blade 41 is not easily worn or crushed, as well as prevented from being broken by the impact.

Blade completion process;

In the heat treatment process, by heating and quenching a portion of the blade back 42 opposite to the blade 41, the blade 41 maintains its strength and has a ductility toward the blade back 42 of the pure bronze (brass) knife 40. The blade 41 is polished to complete the blade 41.

At this time, the blade 41 is formed as a plurality of pure bronze (brass) plate 20 is integrally bonded as shown in Figure 4 made of a pure bronze (brass) composite plate 30, as shown in Figure 5 In addition to the sharp edge of the blade 41 by forming a pure bronze (brass) plate 20 step by step from the edge to the inner side, the blade 41 has abrasion resistance that is not easily damaged or worn Will be.

That is, the pure bronze (brass) composite plate 30 maintains a state in which it is integrally bonded to each other, but when it is heated again, each pure bronze (brass) plate 20 is separated and falls into the first ingot 10. The individual pure bronze (brass) plates 20 cast by each have their boundaries and become thinly deformed.

  Pure bronze (brass) knife 40 completed by the above-described method is a combination of at least two or more pure bronze (brass) plate 20, a mixture of 78% copper and 22% tin, forged integrally forging a plurality of layers The pure bronze (brass) plate 20, which is integrally combined, forms a blade (41) in a state of pure bronze (brass) composite plate (30) in which a plurality of blades are combined while forming a step from the edge of the blade. Pure bronze (brass) knife utilizing the characteristics of sterilization and disinfection even if it is made with any knives such as excessive blades, blades, surgical knives, etc. Will do its job.

a: ingot state b: rolling state c: composite forging state
d: Pure bronze (brass) composite sheet forming state e: Pure bronze (brass) knife blanking state
F: Pure Bronze Knife
10: ingot 20: pure bronze plate
30: pure bronze (brass) composite plate
40: pure bronze (brass) knife 41: blade 42: knife back
45: handle 46: glyph
100: rolling roller 200: forging hammer 201: forging die

Claims (4)

Pure bronze casting process of mixing 78% copper and 22% tin to dissolve to obtain an ingot 10 made of pure bronze;
A rolling step of hot rolling the pure bronze (brass) ingot 10 obtained in the pure bronze casting process to increase the amount;
Pure bronze (brass) obtained by quenching and stretching the pure bronze (brass) plate 20 stretched in the rolling process and overlapping at least two or more layers, and repeating forging and rolling each time to obtain a pure bronze (brass) composite plate (30). Composite plate manufacturing process;
Pure bronze (brass) knife blanking step to obtain the size and shape of the pure bronze (brass) knife 40 to manufacture the pure bronze (brass) composite plate 30 obtained in the pure bronze (brass) composite plate manufacturing process and;
A blade forming step of forging thinly the pure bronze (brass) knife 40 obtained in the pure bronze (brass) knife blanking step only to form the blade 41;
A heat treatment step of heating and quenching the pure bronze (brass) knife 40 formed by cutting the blade 41 in the blade forming step by heating the blade 42 on the side opposite to the blade 41;
A hilt of the hilt for coupling the hilt 45 to the pure bronze (brass) knife 40 heat-treated in the heat treatment step;
Bronze knife manufacturing method characterized in that the blade; . Pure bronze (brass) casting process of mixing 78% copper and 22% tin to dissolve to obtain pure bronze ingot 10;
A rolling step of hot rolling the pure bronze (brass) ingot 10 obtained in the pure bronze casting process to increase the temperature;
Pure pure copper (brass) plate 20 by rolling in the rolling process and quenched and overlapped at least two or more, each time to repeat the forging and rolling to obtain a pure bronze (brass) composite plate 30 bonded integrally Bronze (brass) composite plate manufacturing process;
Pure bronze (brass) knife blanking step to obtain the size and shape of the pure bronze (brass) knife 40 to manufacture the pure bronze (brass) composite plate 30 obtained in the pure bronze (brass) composite plate manufacturing process and;
A handle shaping step of integrally forming the handle 45 of the pure bronze (brass) knife 40 obtained in the pure bronze (brass) knife blanking process and carving various patterns 46 on the handle 45;
Part of the blade 41 to form a pure bronze (brass) knife 40, which is decorated by engraving the pattern 46 on the handle 45 formed integrally with the pure bronze (brass) knife 40 in the handle forming process. Blade forming process forging only thin;
A heat treatment step of heating and quenching the pure bronze (brass) knife 40 formed by cutting the blade 41 in the blade forming step by heating the blade 42 on the side opposite to the blade 41;
Bronze knife manufacturing method characterized in that consisting of; a blade completion step of completing the blade 41 by polishing the blade 41 of the pure bronze (brass) knife 40 heat-treated in the heat treatment step. Pure bronze (brass) plate 20, a mixture of 78% copper and 22% tin is at least two or more layers of the composite combined forging integrally pure pure bronze (brass) plate 20 is a pure bronze (integrally bonded) Brass) Bronze knife characterized in that the blade (41) in the state of the composite plate (30) to form a blade (41) while the pure bronze (brass) plate 20 steps from the edge of the blade. The method of claim 3,
Pure bronze (brass) plate 20, a mixture of 78% copper and 22% tin is at least two or more layers of a combination of forging integrally pure bronze (multiple brass) (20) A large number of pure bronze (brass) knives 40 forming the blade 41 by forming the blade 41 in the state of the brass composite plate 30 so that the pure bronze plate 20 steps from the edge of the blade. Bronze knife, characterized in that the handle 45 is carved into the glyph of the pattern 46.

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