KR100884094B1 - Cooker comprising magnesiume - Google Patents

Abstract

A cooker is provided to increase durability by preventing a magnesium alloy layer from corroding and burning at a high temperature. A method for manufacturing a cooker including a magnesium alloy layer contacting with an aluminum alloy layer comprises a step of manufacturing a clad board by connecting the magnesium alloy layer and the aluminum alloy layer, a step of molding the clad board by drawing with a molding press, a step of processing a surface of the magnesium alloy layer with PEO and a step of coating the surface of the PEO processed magnesium alloy.

Description

Cooking container containing magnesium {COOKER COMPRISING MAGNESIUME}

The present invention relates to a kitchen non-fired cooking vessel, which is a magnesium alloy inside, including a magnesium alloy layer and an aluminum alloy layer bonded to a kitchen cooking vessel for receiving food therein and heating. The present invention relates to a kitchen cooking vessel composed of magnesium alloy and aluminum alloy to solve the problem of ignition and corrosion at high temperature of magnesium alloy.

Magnesium does not exist as a single element in nature but in the form of a salt combined with silicic acid, sulfuric acid or carbonic acid. Magnesium is an inorganic substance that must be ingested and plays an important role in bone metabolism along with calcium and phosphorus in the human body, and plays a decisive role in the activation of amino acids, the synthesis of ATP, and the synthesis of proteins. In addition, contrary to calcium and neurotransmitter action, as well as complementary functions to relax the muscles.

Therefore, in line with the recent trend toward health, it is required in the industry to use such environmentally-friendly and bio-friendly magnesium as a material for kitchen cooking vessels.

However, due to the inherent properties of the metals of magnesium, ignition problems and corrosion at high temperatures could not be used in heating vessels used in kitchens. In the case of magnesium alloy, the problem of ignition at high temperature was not solved.

Republic of Korea Patent Publication No. 10-2008-0016325 discloses an inner pot for a light electric rice cooker, characterized in that it comprises a magnesium alloy layer, but this is to reduce the weight of the inner pot for electric rice cooker. Kitchen cooking vessels are used in contact with an integrated heat source using a gas stove or the like. At this time, the magnesium cooking vessel reaches the flash point of magnesium by direct heating by a heat source, so that fire may occur. Therefore, when magnesium is used as a direct cooking dish for cooking, ignition of magnesium is a problem. On the other hand, this publication does not mention any ignition of magnesium at high temperatures. Therefore, the present invention is completely different from the present invention for the purpose of preventing magnesium from firing.

In order to solve the above problems, the inventors have developed a high-temperature ignition-proof and anti-corrosion magnesium alloy dish-fired non-ignition cooking vessel.

The present invention can be used as a direct heating cooking vessel that does not ignite the magnesium alloy at a high temperature, so that light and environmentally friendly magnesium can be used as a heating cooking vessel.

In addition, the container that could not be used due to the corrosion of magnesium improved the method by environmentally friendly special surface modification treatment to solve the corrosion and the treatment caused a lot of far-infrared rays to cook food deliciously. The heating cooker using magnesium alloy makes it possible to manufacture and use environmentally friendly and innovative products that have no risk of ignition and are not corrosive by using different joining plates and different joining casting methods.

The present invention relates to a kitchen non-fired cooking vessel, which is a magnesium alloy inside, including an aluminum alloy layer bonded to a magnesium alloy layer in a kitchen cooking vessel for heating food therein.

The magnesium alloy layer has a thickness of 0.4 mm to 6.5 mm and the aluminum alloy layer has a thickness of 0.4 mm to 6.5 mm.

In addition, the magnesium alloy layer is a non-fired cooking vessel for the kitchen, characterized in that coated after the surface modification treatment by PLAO (Plasma Electrolytic Oxidation) treatment, the coating is characterized in that the ceramic coating or Teflon coating.

The present invention relates to a method for manufacturing a non-ignition cooking vessel for a kitchen comprising the steps of manufacturing a clad plate by bonding a magnesium alloy and an aluminum alloy, and saddle-clad the clad plate on a molding press and drawing.

More specifically, it relates to a method for producing a non-ignition cooking container for a kitchen, characterized in that it further comprises the step of PEO treatment of the magnesium alloy surface.

In addition, the present invention relates to a method for producing a non-ignition cooking container for a kitchen including the step of molding the magnesium alloy and aluminum alloy in a double casting.

More specifically, it relates to a method for producing a non-ignition cooking container for a kitchen, characterized in that it further comprises the step of PEO treatment of the magnesium alloy surface.

In addition, the present invention comprises the steps of post-processing by pressing drawing the magnesium plate;

It relates to a kitchen non-fired cooking vessel manufacturing method comprising the step of inserting the processed molding plate into a casting mold and molding by aluminum casting.

More specifically, it relates to a method for producing a non-ignition cooking container for a kitchen, characterized in that it further comprises the step of PEO treatment of the magnesium alloy surface.

By joining with the aluminum alloy, the magnesium alloy does not ignite even at a high temperature. In addition, there is an effect that corrosion does not occur by the anti-corrosion treatment.

The present invention relates to a kitchen non-fired cooking vessel, which is a magnesium alloy inside, including an aluminum alloy layer bonded to a magnesium alloy layer in a kitchen cooking vessel for heating food therein.

Magnesium is an alkaline earth metal belonging to Group 2 of the periodic table. The element symbol Mg, atomic number 12, atomic weight 24.3050, melting point 650 ° C, boiling point 1,100 ° C and specific gravity 1.741. Magnesium does not exist as a single element in nature but in the form of a salt combined with silicic acid, sulfuric acid or carbonic acid. In particular, it is one of the eight major elements (oxygen> silicon> aluminum> iron> calcium> sodium> potassium> magnesium).

Magnesium has the characteristic of rapidly oxidizing and igniting when the temperature rises above 450 ℃ in the air, and magnesium is the most chemically active metal among commercial metals. Indicates.

Magnesium is an inorganic substance that must be ingested and plays an important role in bone metabolism along with calcium and phosphorus in the human body, and plays a decisive role in the activation of amino acids, the synthesis of ATP, and the synthesis of proteins. In addition, contrary to calcium and neurotransmitter action, as well as complementary functions to relax the muscles.

 In general, alloys are divided into cast alloys and whole body alloys according to the type used. Magnesium alloys are used for casting, and are used for die casting and electrophoresis, which have been used in aircraft parts before. There is a developed alloy. The predecessor is a Magnox or magnesium-zirconium alloy that cuts and uses fins in an extrusion pipe as a fuel coating material of a nuclear power plant for reactors, and for rockets and aircrafts developed rapidly after World War II. There is a heat-resistant magnesium alloy. Magnox adds a small amount of beryllium to aluminum and the master alloy to improve oxidation resistance against carbon dioxide (carbon dioxide). Recently, heat-resistant alloys include zirconium, rare earth elements, and thorium as alloy elements. There is also an alloy with lithium.

Magnesium alloys mainly contain aluminum or manganese. In particular, the magnesium alloy AZ31B used in the examples of the present invention contains Mg, Al, Mn, Zn, and Zr as components.

The present invention includes not only the case where the magnesium alloy layer and the aluminum alloy layer are joined by the clad metal, but also the case of double casting and the case where the aluminum alloy is cast after processing the magnesium alloy sheet.

In general, a clad plate refers to a laminated composite steel sheet in which two or more surfaces of metal materials are joined by metallization and integrated, and is widely applied to construction, home appliances, automobiles, heavy industries, and the like. The structure of the clad steel sheet is composed of clad metal / base material or clad metal / intermediate bonding material / base material, and clad metal (Cladder, Patent Publication No. 10-2007-0099794 or Clad Metal) is usually 5% to 20% of the thickness of the base material. It occupies and performs a function (corrosion, heat resistance, abrasion, etc.) to impart functionality to the clad steel sheet and protect the base metal from the use environment, and the base metal plays a role of supporting the load acting on the structure.

There are many types of materials used as clad metals, but most of them are high-performance materials that do not deteriorate in harsh environments such as high temperature or acidic corrosive atmospheres, and are expensive. Therefore, the base material uses a relatively inexpensive and excellent workability, and the clad metal forming the surface can save expensive materials by using such materials requiring specific properties, such as cost reduction. In addition to human rights, there is an advantage that can prevent the waste of limited underground resources.

In general, inexpensive iron (Fe) or iron alloy is mainly used as a base material, and a material commonly used as a clad metal includes high carbon steel, stainless steel, nickel, cobalt, copper, copper, aluminum, heat resistant alloys, titanium, and the like. As a method of manufacturing such a clad steel sheet, hot rolling, explosion bonding, diffusion bonding, fusing welding, and the like are known, and the above methods may be used in combination.

In addition, recent kitchen cooking vessels have been commercialized even in the case of a double structure to a large number of 10 structures, the present invention is not necessarily limited to the double structure if it includes an aluminum alloy layer bonded to the magnesium alloy layer.

When magnesium is used as a direct cooking dish for cooking, ignition of magnesium is a problem. Kitchen cooking vessels are used in contact with an integrated heat source using a gas stove or the like. At this time, the magnesium cooking vessel reaches the flash point of magnesium by direct heating by a heat source, so that fire may occur. Magnesium cannot be used in direct cooking vessels that are in direct contact with heat sources such as stoves, as ignition is likely to lead to fire.

The anti-ignition method of the present invention is a method for solving the problem using another adhesive material instead of an alloy composition. In the heating container field, the outer peripheral surface of the container is heated when the magnesium alloy is used as the inner container and the outer bonded material is heated. Make direct contact with As a result, the magnesium alloy does not ignite, and as the temperature increases, the magnesium alloy eventually melts at the melting point.

Aluminum (aluminium / aluminum) is a chemical element belonging to the metal after transition, and the symbol is Al and the atomic number is 13. Lightweight, durable and resistant to oxidation, it is widely used throughout the industry. It is especially used in aerospace, transportation, and construction. It is obtained by electrolysis in the oxide bauxite, and the major alloy used as a material is duralumin.

Magnesium has an atomic number of 12 and aluminum has an atomic number of 13, and magnesium is used a lot in aluminum alloys, and magnesium is used a lot in aluminum alloys.Magnesium has a melting point of 650 ℃ and aluminum has a melting point of 660 ℃. Melting point is also the most similar. Therefore, when the aluminum alloy is introduced into the clad metal, the bonding property is strong.

In addition, during heating, aluminum prevents direct contact with a heat source so that no fire occurs even when the magnesium flash point is reached. This is because magnesium and aluminum are melted at the same time at the beginning of high temperature melting, so that the mixing takes place simultaneously. Ultimately, the magnesium alloy has an effect of preventing ignition.

Magnesium is a ignition metal. Magnesium has intrinsic ignition properties. When magnesium continues to rise in temperature due to external heat, magnesium is converted from solid to liquid to reach the ignition point temperature to ignite. Therefore, magnesium does not ignite unless dissolution occurs. Aluminum, on the other hand, is a non-ignition metal that has a very similar temperature between magnesium and melting point, good affinity, and does not ignite when dissolved.

When the magnesium starts to dissolve as the temperature rises due to external heat, the magnesium absorbs and mixes the dissolved material of the adjacent aluminum. Magnesium melts due to external heat and rises to the ignition point temperature, where it absorbs adjacent molten aluminum and mixes it. The mixing prevents the rise of magnesium to the ignition point, and at the same time absorbs and mixes aluminum, which is a non-ignition metal, thereby reducing the ignition of magnesium and preventing the ignition of magnesium.

Preventing ignition by using the aluminum composition in such an indirect manner can directly improve the quality of the cooking vessel by increasing the pure content of magnesium as compared to the composition of the high aluminum content of magnesium.

More specifically, the thickness of the magnesium alloy is 0.4 mm to 6.5 mm, the thickness of the aluminum alloy is 0.4 mm to 6.5 mm for a kitchen non-fired cooking vessel, characterized in that.

If the thickness of the magnesium alloy and aluminum alloy is 0.4 mm or less, it is vulnerable to physical impact. When the thickness of the alloy is 6.5 mm or more, it takes a long time to heat the cooking vessel and the thermal conductivity is lowered.

The present invention relates to a non-fired cooking vessel for a kitchen, characterized in that the magnesium alloy is coated after the surface modification treatment by PEO (Plasma Electrolytic Oxidation) treatment.

Magnesium is the most chemically active metal among commercial metals, and its standard electrode potential is 2.363V _NHE . In general, magnesium is very rapidly corroded in air or in solution when it is not surface treated. Therefore, in order to commercialize magnesium products, a surface treatment method for enhancing corrosion resistance by chemically, electrochemically or physically treating the surface of the product is required.

Corrosion reaction of magnesium is caused by the following oxidation and reduction reactions.

Mg = Mg ^{2 +} + 2e (1)

2H + + 2e = H ₂ (2)

_{2H 2 O + 2e = H 2} + 2OH - (3)

Mg + 2H ⁺ = Mg ^{2 +} + H ₂ (4)

^{Mg 2 + + 2OH - = Mg} (OH) 2 (5)

Mg + 2H ₂ O = Mg (OH) ₂ + H ₂ (6)

Scheme (1) shows the oxidation reaction that takes place on the anode of a local cell formed on the magnesium surface. And (2) and (3) represent the reduction reactions occurring at the cathode of the local battery. Reaction (2) is a reduction reaction mainly occurring in an acidic solution in which a large amount of hydrogen ions is present, and reaction (3) represents a reduction reaction occurring in a neutral or alkaline solution having a very low amount of hydrogen ions. Therefore, in the acidic solution, a local battery in which the oxidation reaction (1) and the reduction reaction (2) are combined to form a corrosion reaction as shown in Reaction (4) causes magnesium to be dissolved as ions and hydrogen gas is generated. In a neutral solution or an alkaline solution Mg ^{2 +} formed by the oxidation reaction of magnesium (1) OH formed by the water reduction reaction ⁽³⁾ as shown in the reaction with the chemical formula (6), Mg (OH) ₂ Is formed on the magnesium surface. Therefore, the alkali solution in which the Mg (OH) ₂ film is formed on the surface shows passivation, whereas the acid solution in which the passivation film is not formed causes corrosion of magnesium.

Surface treatment of magnesium products can be divided into chemical, electrochemical and physical methods. Chemical methods include chemical conversion, in which magnesium products are immersed in chemicals and a corrosion resistant surface film is formed by chemical reactions occurring on the surface. Electrochemical methods include anodizing to form a corrosion resistant oxide film on the surface by applying electricity in a solution, and a plating method to coat a corrosion resistant metal film on the surface. Physical surface treatment is a method of coating a protective polymer layer on the surface. Among these methods, chemical and electrochemical methods, such as chemical treatment, anodization, and plating, are known as the most advanced surface treatments of magnesium, and currently require high skill and knowledge in terms of treatment and principle. Many studies are active.

Regardless of the surface treatment method in the chemical and electrochemical surface treatment methods of magnesium, there is a pretreatment step that is commonly performed before entering the surface treatment step. The purpose of the pretreatment process is to remove oil or high temperature oxidation scales generated during machining, casting, plastic processing, etc. before surface treatment, and to remove surface oxide films naturally formed in the air. This pretreatment process is a process that makes the surface state easy to surface treatment is indispensable to maximize the surface treatment effect.

Commonly used pretreatment processes include mechanical pretreatment to remove solid residues and chemical pretreatment to remove residues in the form of organics or oxides. Mechanical pretreatment methods include barrel grinding or shot blasting. Chemical pretreatment includes degreasing to remove oils, pickling to remove oxides, and surface adjustment for surface activation.

In the case of spark anodization, one of the pretreatment processes, the technology is named ASD (Anodic Spark Deposition) in the US, Anomac in Japan, ANodishe Oxidation an Funkenanladung in Germany, and Micro-arc Oxidation (MAO) in Russia. It is also used as PEO (Plasma Electrolytic Oxidation), but the first commercialization technology is Russia, so it is commonly used as MAO or PEO.

The first technology for PEO was published by Gunterschulze in 1932, and its practical application is a corrosion-resistant coating of magnesium alloy, which is known to have been adopted in the US MIL Specification in 1963. First, the application of this technology to aluminum alloys in commercially available valve metal groups was first known by the patents of Hardcovsky in 1974 and Markov in 1976, and then gradually improved in Russia, Europe and the United States. Is coming. The source of the patents is mainly Russia and the United States, and the Russians dominate if the inventors are considered.

Metals applicable to this technology include aluminates, silicates, tungstates, molybdates, chromates, and the like, which are valve metals as anodes. A weak alkali solution such as phosphate is loaded with a high voltage or high current pulse or alternating current to form an insulating film on the surface of the metal, and its breakdown occurs repeatedly, resulting in a unique amorphous. An anodized film is formed of the crystallized film. In addition to the solution used, the charge loading program varies with each patented technology, generally available in DC, mainly in pulses in Russia, and in the United States mainly by alternating current. It can be said to be a spark anodization technology to obtain a film.

The coating layer formed is composed of a thin transitive layer, a functional layer, and a technical layer from the material. Transitive layer provides strong adhesion through chemical bonding with the material, functional layer is composed of alumina to form a high hardness and dense layer, and technical layer is alumina. It is composed of alumina and has high porosity and brittleness and high surface roughness (Moon Sung Mo, Jung Yong Soo, Machinery and Materials, 2004 · 7, p55 ~ p64).

Ultra-hard anodization technology is more wear-resistant and more resistant than conventional chemical or electrochemical methods such as hard anodizing, electroplated hard chrome, and plasma ceramic spraying. The coating performance such as corrosiveness and withstand voltage is excellent, and the hardness of magnesium oxide film can be obtained about Hv 500 ~ 700. One of the biggest advantages of this technology is that it is environmentally friendly, safe, and easy to operate with simple pretreatment, that is, it is easy to form a film by simply degreasing without complex and difficult pretreatment process in general anodization or chemical conversion. It's a process without impact.

Despite these advantages, the most vulnerable of this ultrahard coating is the process cost and the film properties. First of all, the process cost mainly uses high voltage / high current, and some technologies use pulse, PR wave, or alternating current, so the initial equipment cost (power supply) is very high and the operating cost is expensive. Next, the physical properties of the film are slightly different depending on the material (for casting and processing), but the craters formed inevitably in the process are very brittle, and are very limited to be applied to dust-sensitive semiconductor component equipment. Back surface polishing process can be applied to these parts, causing the cost increase due to post-processing.

Moreover, the coloring process by the electrolytic method in the pore bottom like the coloring process of aluminum is not developed. Fundamentally, this ultrahard coating has a very large pore size and a porous layer of at least one third of the surface because the barrier layer thickens with increasing voltage and then breaks down. Therefore, the development of beautiful metal coloring processes such as aluminum is limited. As a result, the dyeing process may be colored, or the organic coating (UV coating), the sol-gel process, the electrostatic coating, etc., the coloring process may be inevitable.

Treatment of light metal surfaces with PEO has the following beneficial effects: 1) It prevents corrosion and 2) The surface of clad plate made of magnesium alloy and aluminum alloy is modified with MgO and Al ₂ O ₃ . 3) In case of Magnesium Oxide alloy plate, far 93% comes out at room temperature of 40 ℃, so food is cooked evenly from inside due to abundant far infrared rays. 4) Modification of the surface layer is stronger than HV 600 in case of magnesium alloy sheet. 5) In addition, the density of the surface is very dense so that moisture such as brine does not pass through the PEO layer. 6) Due to the fine roughness of the surface, the adhesion is very good during the surface coating treatment such as Teflon coating and ceramic coating, which prevents poor adhesion of the coating and maintains the coating life for a long time. 7) When the cooking container is heated at high temperature, the surface layer is modified with ceramic layer, so the container reduces the high temperature phenomenon of heat and also reduces the warping of the container. 8) When the temperature rises to the melting point, the PEO-treated ceramic layer seals and locks the melting of the metal for a certain period of time, reducing the safety and delaying the ignition of magnesium. 9) Modified with ceramic layer, environmentally friendly. 10) Even if the painted ceramic or Teflon coating layer is peeled off, it has the function of secondary protective film. 11) to increase the melting point of metal, 12) to increase the flash point of magnesium and to reduce the ignition. 13) increases the strength of the metal, 14) prevents scratches on the surface layer. 15) PEO treatment solution is an alkaline and environmentally friendly solution. 16) PEO treatment can be performed simultaneously for magnesium and aluminum composite plates. 17) Far-infrared radiation of aluminum oxide is about 92% at 40 ℃. Therefore, you can receive a lot of far-infrared rays that are beneficial to the body when cooking, which is good for health.

In addition, the coating is directed to a non-fired cooking vessel for the kitchen, characterized in that the Teflon coating or ceramic coating.

Generally, surface treatment methods for preventing corrosion of containers include chemical conversion treatment, anodization treatment, zinc plating, nickel plating, and resin powder coating. However, in the present invention, the surface is first modified by PEO (plasma oxidation treatment) and finished on the ceramic coating, Teflon coating, and the like.

The present invention provides a method of manufacturing a cooking vessel for cooking by heating food therein, the method comprising: manufacturing a clad plate by bonding a magnesium alloy and an aluminum alloy; The present invention relates to a method for manufacturing a non-ignition cooking container for a kitchen comprising the steps of saddle-molding the clad plate on a molding press and drawing molding.

As a method for producing a clad plate of magnesium alloy and aluminum alloy, hot rolling, explosion bonding, diffusion bonding, fusing welding, and the like are known, and the above methods may be used in combination. Including a mold saddle and drawing-molding the clad plate material thus prepared in a general molding press, to prepare a kitchen non-ignition cooking container.

More specifically, it relates to a method for producing a non-ignition cooking container for a kitchen, characterized in that it further comprises the step of PEO treatment of the magnesium alloy surface.

Manufacturing a non-ignition cooking vessel for the kitchen, including the step of saddle and drawing molding the prepared clad plate material in a general molding press, the PEO treatment of the magnesium alloy surface. After PEO treatment, the ceramic coating, Teflon coating, and the like are finished to prepare a non-ignition cooking container for the kitchen.

The present invention relates to a method for manufacturing a non-ignition cooking vessel for a kitchen comprising the step of molding a magnesium alloy and an aluminum alloy in a double casting in a kitchen cooking vessel manufacturing method for heating food therein.

Casting refers to the operation of molding by injecting molten metal into a cavity of a mold made of a desired model. The most common molds are made of sand and mud, and ceramics, cemented sand and other materials are also used to make the molds. These materials surround the exterior of a model (usually made of wood, metal, resin, etc.) that forms a cavity into which molten metal will be injected. When the material that forms the mold is shaped into a model, the model is removed from the mold. Molds are usually divided into upper and lower molds, which are inserted into the mold after the model is removed and are precisely connected by pins and bushes (thin cylinders). The molten metal is then injected into the mold through a spout and sent to each part of the cavity through a runner. The mold must be strong enough to withstand the pressure of the molten metal as well as breathable enough to allow air and other gases to escape from the cavity of the mold. If it is poorly ventilated, there will be holes in the casting.

Modeling for foundries requires careful attention and skill. The model should be larger than the desired casting, taking into account the shrinkage during which the liquid turns into a solid due to lower temperature. The polystyrene foam model remains in the mold and vaporizes upon contact with the injected metal, and the wax model melts and flows out of the mold before molten metal is injected. Metal molds are commonly used in the casting process known as mold casting. The mold often requires a cavity, so a core is attached to one part of the mold. Core frames made of metal, resin and wood may be used. The mass-produced modern foundry features a high degree of mechanization, automation and robotization, and microprocessors can accurately control the entire process. With the development of chemical binders, molds and cores are stronger and more precise can be cast. Working in vacuum improves precision and purity, and further development is expected through gravity-free casting in space.

Double casting refers to introducing a molded product formed by primary casting into a mold and casting again. In the dissimilar metal joint casting of magnesium alloy and aluminum alloy, a step of casting different metals, namely magnesium alloy, for the interior of the container is first performed, and then used for inserting into the casting mold and casting the aluminum alloy on it. As with the cladding, dissimilar metal joints are also solved in casting. The casting is composed of the primary casting and the secondary casting so that the dissimilar metal is melted and bonded by high temperature melting casting method, not the material of general bonding, so that the clad metal does not separate and ignite when used as a cooking vessel. It is also possible to carry out the first casting with aluminum alloy and then the second casting with magnesium alloy, and after the second casting, it is also possible to cast the third or more using stainless steel or the like.

Die casting is also known as die casting. It is a precision casting method in which molten metal is injected into a steel mold that is precisely machined to perfectly match the required casting shape, thereby obtaining the same casting as the mold. The product is called diecast casting. In Japan, it is referred to as sand casting, mold casting, low pressure casting, and die casting.

The definition of diecast refers to a method of producing a large amount of castings having excellent casting surface with high precision by injecting molten metal into a precise mold and a product thereof. Diecasting is also a method of casting. Diecast originally comes in three forms: gravity diecast, low pressure diecast, and pressure diecast. In general, diecast refers to pressure diecast.

The invention of the die-casting method is developed after trial and error such as the dead power based on Pascal's principle, balance of mold strength, extrusion and withdrawal of product from mold, development of mold release agent, lubricant, removal of slug in mold, and runner gate design. It was.

Magnesium alloy is first casted by die casting, and aluminum alloy is second casted again by die casting. On the contrary, it is also possible to cast aluminum alloy first by die casting and magnesium alloy second casting by die casting.

More specifically, it relates to a method for producing a non-ignition cooking container for a kitchen, characterized in that it further comprises the step of PEO treatment of the magnesium alloy surface.

Preparing a non-ignition cooking container for the kitchen, including the step of PEO treatment of the magnesium alloy surface of the manufactured double casting. After PEO treatment, the ceramic coating, Teflon coating, and the like are finished to prepare a non-ignition cooking container for the kitchen.

The present invention provides a method of manufacturing a cooking vessel for a kitchen to accommodate and heat food therein, the method comprising: post-processing by pressing drawing a magnesium plate;

It relates to a method for manufacturing a kitchen non-ignition cooking container comprising the step of inserting the processed molding plate into a casting mold to form aluminum casting.

More specifically, the method for manufacturing a non-ignition cooking vessel for the kitchen, characterized in that it further comprises the step of PEO treatment of the magnesium alloy surface.

Hereinafter, the present invention will be specifically described based on the following examples, but the present invention is not limited by the following examples.

Production Example

Production Example  1. Magnesium Aluminum Clad  Manufacture of metal sheet

The magnesium alloy (Az31B) plate and the aluminum alloy (Al6061) plate were heated to a constant temperature and joined by pressing the two metals up and down in the same manner with a roller press.

Production Example  2. Magnesium Aluminum Clad  Manufacture of Foundry Metals

 A magnesium alloy (Az31B) ingot was placed in a melting crucible and dissolved at 690 ° C. The molten magnesium alloy metal liquid was cast in a molding die by a die casting machine. The cast container was used as the inner circumferential surface, and the outer circumferential surface was double cast as aluminum alloy (Al6061) casting.

Production Example  3. magnesium plate and aluminum Clad  Manufacture of Foundry Metals

 A magnesium alloy (Az31B) sheet material was molded through a press die. The molded magnesium alloy molding container was used as the inner circumferential surface, and the outer circumferential surface was double cast as aluminum alloy (Al6061) casting.

Test Example

Test Example  1. Measurement of high temperature flammability

A magnesium alloy 3 mm specimen was heated using a gas torch. After 5 minutes of heating, the magnesium alloy ignites with intense burning as shown in FIG. 1.

Clad metal sheet specimens of 3 mm magnesium alloy and aluminum alloy were heated using a gas torch. After 5 minutes of heating there was no reaction and after 7 minutes As shown in Figure 3, melting began to occur.

2 shows a fired magnesium alloy. The middle part was ignited and a large hole was found. On the other hand, as shown in Figure 4, the magnesium alloy and aluminum alloy was melted to see the traces flowing down like icicles.

5 shows a ignited magnesium alloy, a non-ignited magnesium alloy and an aluminum alloy clad metal sheet. The difference between the ignited and non-ignited cases was clear.

Test Example  2. Measurement of Far-Infrared Emission of Coated Metal Sheet

Far-infrared emission was measured at 40 ° C. using a far-infrared measuring apparatus for 3 mm magnesium alloy and aluminum alloy treated with PEO.

The emissivity of the aluminum alloy (Al6061) reached 91.8%, and the emissivity of the magnesium alloy (Az31B) was 92.5%. This is close to 100% and corresponds to a very high emissivity.

Example

Example  1. Magnesium Alloy Clad  Plate frying pan  Produce

(1) Magnesium alloy plate (Az31B) 1.5 mm standard was prepared and cut to 300 mm square.

(2) An aluminum alloy sheet 2,5 mm standard was prepared and 3000 sheets were cut to 300 mm square.

(3) The alloy plates of (1) and (2) were washed with a cleaning agent and washing water and then dried.

(4) The alloy plates of (3) were placed in a conveyor type high temperature furnace one by one in order and passed through for about 10 minutes.

(5) The alloy plates of (4) were put up and down one by one using the up and down roller pressure press, and the clad plate was manufactured by passing them to be 2.5 mm thick.

(6) The prepared clad plate member was cut into a circular plate member of 300 mm again through a press die.

(7) The cut circular plate was placed in a 24cm high-temperature mold and the drawing was bulged by using magnesium alloy inside.

(8) The molded container of (7) was processed by cutting the side edge of the side of the container which is a post-processing step, and the scratches and the like produced by drawing were polished by sandpaper.

(9) Three holes were drilled by triangular point with the container handle attachment part of (8).

(10) The vessel of (9) was washed with washing water.

(11) The vessel of (10) was subjected to PEO treatment by immersing the alkaline solution in a tank bath.

(12) The PEO-treated container was taken out of the bath, washed three times in washing water, and dried.

(13) The dried container was put in clean paper with clean gloves to prevent stains and then moved to a ceramic coating chamber.

(14) After removing the wrapping paper from the coating chamber, the ceramic coating was dried by performing three inner and three outer circumferences.

(15) The coated container was moved to the assembly line, and three rivets were pressed by a press to attach a handle to complete the frying pan.

Example  2. Magnesium Alloy Die casting  Casting frying pan  Produce

(1) Magnesium alloy ingot AZ31B was prepared.

(2) A magnesium alloy ingot was placed in a magnesium melting furnace and dissolved at 690 ° C.

(3) The die casting machine was equipped with a 24 cm fry pan mold.

(4) The molten magnesium alloy was put into the mouthpiece by using the Robert Ladle, the piston of the die casting machine was operated to push the molten magnesium alloy into the magnesium mold to form a frying pan.

(5) The molded container was moved to a post-processing section for post-processing.

(6) An aluminum alloy ingot was prepared.

(7) An aluminum alloy ingot was placed in a melting furnace and dissolved at 660 ° C.

(8) The magnesium casting vessel of (5) was inserted into an aluminum mold for double casting and fixed.

(9) The molten aluminum alloy was put into a hot water hole using Robert Ladle, the piston of the die casting machine was operated, and the molten aluminum alloy was pushed into the mold for double casting.

(10) The double-casting frying pan was sent to the post-processing section for post-processing.

(11) The double-casting frying pan of (10) was dried with a cleaning agent and washing water.

(12) The vessel of (11) was immersed in a tank bath, even alkaline solution, and treated with PEO.

(13) The PEO-treated container was taken out of the bath and then washed three times in washing water and dried.

(14) The dried container was put into clean paper with clean gloves to prevent stains and then moved to a ceramic coating chamber.

(15) After peeling off the wrapping paper in the coating chamber, the ceramic coating was dried by performing three inner circumferences and three outer circumferences.

(16) The coated container was moved to the assembly line, and three rivets were pressed by a press to attach a handle to complete the frying pan.

Fig. 1 Ignition state of magnesium alloy, when A is 5 minutes after heating, B is 5 minutes and 10 seconds after heating, C is a fire state when 5 minutes and 15 seconds after heating

Fig. 2 Magnesium alloy complete ignition

Figure 3 Magnesium alloy and aluminum alloy clad in a molten state A when 7 minutes after heating, B is 7 minutes and 30 seconds after heating, C is a melting state when 8 minutes after heating

4 magnesium alloy and aluminum alloy cladding is complete

5 Comparison of the ignited magnesium alloy and the molten magnesium alloy and aluminum alloy clad

6 Measured emissivity of aluminum alloy and magnesium alloy treated with PEO

Claims (9)

In the kitchen cooking vessel that accommodates and heats the food therein, It comprises a magnesium alloy layer and the aluminum alloy bonded to the layer, and the magnesium alloy is a direct-fired non-ignition cooking container for the interior of the magnesium alloy, characterized in that the coating after the surface modification treatment by PEO (Plasma Electrolytic Oxidation) treatment. According to claim 1, wherein the thickness of the magnesium alloy is 0.4 mm to 6.5 mm and the thickness of the aluminum alloy is 0.4 mm to 6.5 mm kitchen non-fired cooking vessel, characterized in that. delete In the kitchen cooking vessel manufacturing method for receiving and heating food therein, Manufacturing a cladding plate by bonding a magnesium alloy and an aluminum alloy; Saddle the clad plate with a molding press and drawing molding; PEO treating the magnesium alloy surface; And Coating the surface of the PEO-treated magnesium alloy; Method for producing a non-ignition cooking container for the kitchen is a magnesium alloy containing a. delete In the kitchen cooking vessel manufacturing method for receiving and heating food therein, Molding the magnesium alloy and the aluminum alloy by double casting; PEO treating the magnesium alloy surface; And Coating the surface of the PEO-treated magnesium alloy; Method for producing a non-ignition cooking container for the kitchen is a magnesium alloy containing a. delete In the kitchen cooking vessel manufacturing method for receiving and heating food therein, Post drawing by molding the magnesium alloy sheet; Inserting the processed molding plate into a casting mold to mold aluminum alloy casting; PEO treating the magnesium alloy surface; And Coating the surface of the PEO-treated magnesium alloy; Method for producing a non-ignition cooking container for the kitchen is a magnesium alloy containing a. delete

Images