KR20040064107A - The 5-ply clad sheet made of stainless steel sheet, aluminum sheet and coppper sheet, and the manufacturing method of it - Google Patents

Abstract

PURPOSE: A quintet junction clad plate is provided to prevent a surface of a copper from being revealed, thereby solving a problem of endurance against an oxidation caused by the contact with food and air. CONSTITUTION: The clad plate having a junction of a stainless plate, an aluminum plate and a copper plate, comprises: a stainless plate(11); an aluminum plate(12) processed by brushing on its both sides; a copper plate(13) processed by brushing on its both sides, each plates being piled in series in the form of a quintet junction and being jointed by rolling process; a first oxide layer(11) between the stainless plate(11) and the aluminum plate(12), the first oxide layer(11) being formed by junction of both oxide layers on the surfaces of the stainless plate(11) and the aluminum plate(12); and a second oxide layer(12) formed by an oxide layer on the surface of the aluminum plate(12).

Description

The 5-ply clad sheet made of stainless steel sheet, aluminum sheet and coppper sheet, and the manufacturing method of it}

The present invention relates to a stainless steel plate, an aluminum plate, a copper plate, an aluminum plate, and a five-junction cladding plate in which a stainless steel plate is laminated and bonded in a series of orders, and more particularly, a stainless steel plate and a brushed aluminum The plate and the copper plate were respectively heated in two heating furnaces in the air atmosphere under different heating conditions, and then the cooled copper plate and the uncooled stainless steel plate and aluminum plate were brushed with both surfaces of the cooled copper plate. The present invention relates to a five-clad cladding plate laminated in the order of plate / copper plate / aluminum plate / stainless steel plate and joined by rolling, and a method of manufacturing the same.

Common materials used in kitchen pans, pans, pots, kettles, and the like may include aluminum plates, copper plates, stainless steel plates, and the like. In the case of the surface oxide harmful to the human body is formed on the surface has a disadvantage that it is insufficient to use in real life.

In particular, in the case of aluminum, not only is there a lack of corrosion resistance to various foods, but when it comes into contact with boiling water, a compound such as aluminum hydroxide is formed on the surface, and the color of the surface becomes black, which causes Alzheimer's disease. Esau prohibits direct use. In the case of aluminum products, it is common to use a special coating on the surface.

In addition to the drawbacks described above, copper or aluminum, in spite of being a soft material, is not only inferior in drawing processability compared to other steel products, but also deformed by external impact and is relatively expensive. Stainless steel sheet, which is inexpensive, has proper drawing workability and rigidity, and has excellent corrosion resistance and surface gloss, is widely used in kitchen products.

However, stainless steel sheet has excellent corrosion resistance but poor thermal conductivity. Therefore, in case of products made by drawing process, heat is not absorbed quickly through the bottom surface when heated, and heat is lost. There is a disadvantage in that it causes local overheating.

That is, in view of the efficient use of energy, the stainless steel sheet has an undesirable disadvantage compared with the aluminum sheet or copper plate.

Therefore, in order to solve the disadvantage of stainless steel sheet having excellent gloss and stiffness but inferior thermal conductivity, heterogeneous metal sheets such as aluminum plate or copper plate, which have low oxidation resistance and stiffness but excellent thermal conductivity, are bonded to the stainless steel sheet to provide mutual advantages. Clad plate was developed so that it can be used, and the representative one is the clad plate of aluminum plate and stainless steel plate.

In the case of the clad plate in which the aluminum plate and the stainless steel plate are joined, the aluminum plate is generally bonded to the outer surface of food or the stainless steel plate, which is not touched by food, and that the aluminum plate is lighter and thermoelectric than other metal materials. Although the city is excellent, it has a weakness of corrosion resistance to food.

Clad plate bonded to the stainless steel plate and aluminum plate is improved in terms of heat conductivity compared to kitchen products made of stainless steel plate only, but because the color of the two metal plates are similar, the decoration is rather lower than that made of only excellent stainless steel sheet There are disadvantages.

However, with the improvement of living standards and the demand for high-quality kitchen products, a cupper clad plate in which a copper plate having a better thermal conductivity than the aluminum plate and having excellent decorative and appearance properties is bonded to a stainless steel plate has been developed.

The cupper clad plate is usually made of a triple bonded cladding plate by interposing an aluminum plate between the copper plate and the stainless steel bar, so that it is difficult to directly join the copper plate and the stainless steel plate. will be.

At this time, the triple cladding cladding plate using the copper plate is excellent in decoration because the copper plate is exposed to the surface, but the copper plate is in contact with the atmosphere, and the copper plate surface reacts with carbon dioxide, sulfur dioxide, and moisture contained in the atmosphere, which is harmful to human body. There is a problem that occurs, and the following problem also occurs in the manufacturing method.

Since the clad plate is generally manufactured by a hot rolling method for a metal sheet in a heated state, it is important to heat the metal sheet under a reducing atmosphere so that an oxide layer that prevents surface bonding between the plates is not formed.

In particular, copper oxide, which is formed on the surface of the copper plate upon heating, is brittle and fatal to joining because it is easily detached from the surface by an impact or the like.

Therefore, the copper plate used for the triple bonded cladding plate is heated in a special heating furnace that guarantees a reducing atmosphere, or is heated in a general heating furnace by plating nickel or chromium on the surface of the copper plate so that the atmosphere gas is supplied. Alternatively, there is a problem that the equipment is complicated by the plating and the manufacturing cost is increased.

And, in the case of clad plate having a triple lamination structure using copper plate, it was proved to be excellent in thermal conductivity and ductility, but the copper plate comes into contact with the atmosphere, so that carbon dioxide, sulfur dioxide and moisture contained in the atmosphere react with the copper plate. It has been found that harmful cyan occurs, and the metal cookware that heats rapidly by heating and rapidly cools when extinguished by increasing heat capacity by joining metal with excellent thermal conductivity to the metal with excellent thermal conductivity but improving thermal efficiency while decreasing thermal conductivity The clad plate was developed to compensate for the shortcomings, but it was not possible to give sufficient heat capacity to the clad plate by only triple bonding.

That is, the conventional double or triple cladding plate has a disadvantage in that the ability to hold heat for a long time as compared to ceramic or earthenware is very poor.

In addition, in order to prevent the formation of oxides on the surface of the copper plate when heating it in a general atmosphere other than a non-oxidizing atmosphere, a method of heating the copper plate at 150 to 200 ° C. has been developed. Although there is an advantage in simplifying, there is a problem that the step of cleaning the copper plate surface before heating the copper plate is required because the oil components such as the rolling oil remaining on the copper plate surface is not completely removed and these organic substances interfere with the bonding.

The present invention was devised to solve various problems of the clad plate and the manufacturing method of the conventional copper plate bonded, the contact surface with the food and the atmosphere so that the copper plate surface of the triple bonded clad plate exposed to the surface is not exposed to the outside To solve the problem of oxidation resistance by preventing the side, the side cross section is exposed to the outside to give the side decoration by the intrinsic color of the copper plate, improve the heat retention capacity by increasing the heat capacity of the clad plate to improve the heat retention ability of the heated food At the same time, the present invention provides a clad plate and a method of manufacturing the same, which do not require complicated and expensive equipment for forming a reducing atmosphere or a high vacuum atmosphere or performing an anti-oxidation plating in order to prevent the formation of an oxide film on the surface of the metal plate that prevents the bonding between metals. There is an object of the present invention.

1 is a schematic cross-sectional view of a cladding plate in one embodiment of the invention.

2 is a process block diagram of the manufacturing method of the present invention.

((Explanation of symbols for main part of drawing))

11.Stainless Steel Plate 12.Aluminum Plate

13. Copper plate

The above object of the present invention is achieved by heating the stainless steel sheet and the aluminum sheet in the atmosphere and brushing the surface of the aluminum sheet and the copper plate.

The 5-junction cladding plate of the present invention has a 5-layer lamination structure of stainless steel sheet / aluminum sheet / copper sheet / aluminum sheet / stainless steel sheet, and the stainless steel sheet is heated together with the brushed aluminum sheet, but the copper sheet is made of stainless steel sheet and It is heated separately from the aluminum plate.

At this time, both surfaces of the aluminum plate is brushed before heating, and the copper plate has the technical features of the method of the present invention because both surfaces are brushed after heating and cooling.

In particular, in the method of the present invention, the stainless steel plate and the aluminum plate are heated together and the copper plate is heated separately, and the stainless steel plate, the aluminum plate, and the copper plate are separate furnaces controlled at temperatures of 300 to 500 ° C. and 200 to 500 ° C., respectively. Heated for 25-30 minutes and 10-25 minutes each.

At this time, there is a difference in the purpose of heating the stainless steel sheet and the aluminum plate and the copper plate, the heating of the stainless steel plate and the aluminum plate is to form a surface oxide and cause mutual diffusion during rolling, whereas in the case of copper plate The main purpose of the removal is to limit the heating conditions as described above.

When the stainless steel sheet and the aluminum sheet are heated under an atmospheric atmosphere, when the heating temperature is less than 300 ° C., the formation of the surface oxide layer becomes incomplete, resulting in a lack of bonding strength between the metal plates after hot rolling, and when the temperature exceeds 500 ° C. Not only is the oxide layer excessively formed, it is more densely formed than necessary, and its structure is stabilized, so that the crack of the oxide layer is insufficient during hot rolling, thereby lowering the bonding force between the metal plates.

That is, when the oxides formed on the two metal surfaces of the stainless steel sheet and the aluminum plate are cracked during rolling, the cracked oxide layers are matched with each other, and at the same time, the bonding is performed between the two metal plates by mutual diffusion. The bonding force between the aluminum plates has an appropriate value from around 300 ° C of heating temperature, increases with temperature rise, shows the highest value near 400 ° C, and decreases with temperature increase, showing the minimum value of the desired bonding force at 500 ° C. Then decreases rapidly.

In addition, even in the case of the copper plate is heated under an atmospheric atmosphere, unlike the stainless steel plate and aluminum plate, the heating of the copper plate is to evaporate by thermal decomposition of the rolling oil or other contaminants remaining on the surface of the copper plate, when the heating temperature is less than 200 ℃ The evaporation of surface contaminants does not occur sufficiently, which lowers the bonding strength with the aluminum plate. If the temperature exceeds 500 ° C, the formation of the unnecessary surface oxide layer is excessive, making it difficult to remove by brushing, thereby decreasing the bonding force with the aluminum plate. Because.

In addition, the copper plate from which surface contaminants have been removed by heating is removed from the furnace, cooled to room temperature, and then the surface of the copper plate is brushed to remove surface oxides generated during heating, thereby removing the oxide on the surface of the copper plate. Since a large number of scratches are formed on the surface of the copper plate, the surface energy of the copper plate is increased to make bonding with the aluminum plate more effective.

That is, the bonding between the copper plate and the aluminum plate is made by rolling the copper plate cooled to room temperature and the aluminum plate heated, and unlike the stainless steel plate, since the surface oxides of the copper plate interfere with the aluminum plate, the copper plate is removed. As the scratch formed on the surface of the copper plate and the oxide on the surface of the aluminum plate to bond to the surface of the stainless steel sheet, the bonding between the two metals is made.

In the case of the heating time, the above time range is most preferable, and although it is a variable that can be changed according to material conditions such as the thickness, area, and surface state of the metal plate, the stainless steel plate and the aluminum plate if they do not reach the minimum value of the time range. When the surface oxide formation and surface residue decomposition evaporation of copper plate are not complete, and the maximum value is exceeded, the oxide on each plate surface is excessively and densely formed, and the bonding strength of stainless steel plate and aluminum plate is decreased. This is because the oxide becomes difficult to remove.

Details of the effects and the resulting effects, including the object and technical configuration of the present invention will be clearly understood by the following description with reference to the drawings showing a preferred embodiment of the present invention.

The cross-sectional schematic diagram of the 5-fold cladding cladding board of this invention is shown in FIG. 1, and the block diagram of the manufacturing method of this invention is shown in FIG.

As shown in the figure, the five-clad cladding plate according to the present invention includes a stainless steel plate 11, an aluminum plate 12, a copper plate 13, an aluminum plate 12, and a stainless steel plate 11 in a series of orders. By having a five-layer laminated structure laminated and bonded, both surfaces of the copper plate 13 are symmetrical to each other.

At this time, oxide layers 11 'and 12' are interposed between the stainless steel plate 11, the aluminum plate 12, and the aluminum plate 12 and the copper plate 13, and the stainless steel plate 11 The oxide layer 11 ′ between the aluminum plate 12 and the aluminum layer 12 is matched with the oxide layers of the stainless steel plate 11 and the surface of the aluminum plate 12 cracked with each other by rolling, and the aluminum plate 12 and the copper plate ( The oxide layer 12 ′ between the 13 layers is in a state where the cracked oxide layer on the surface of the aluminum plate 12 is matched with scratchable irregularities on the surface of the copper plate 13 formed by brushing.

Of course, scratching irregularities on the surface of the aluminum plate 12 also act on the matching of the oxide layer 11 'between the stainless steel plate 11 and the aluminum plate 12, and the two oxide layers 11' and 12 ' Diffusions due to heat and rolling pressure are also produced finely.

As the stainless steel sheet having the lowest thermal conductivity is located in the outermost layer as described above, the heat supplied to the stainless steel sheet on one side is quickly supplied to the copper plate side through the aluminum plate, but the heat dissipation to the outside is suppressed by the stainless steel sheet on the opposite side so that the two stainless steel sheets are Heat that accumulates in between increases to have a property that does not easily cool.

The five-clad cladding plate of the present invention as described above, step (100) to form a scratch on each surface by performing a brushing operation on both sides of the aluminum plate (12); The aluminum plate 12 and the stainless steel plate 11 are upright for 25 to 30 minutes at a temperature of 300 to 500 ° C., and the copper plate 13 at a temperature of 200 to 500 ° C. for 10 to 25 minutes. Heating (200) (200 ') each in a furnace; Pulling the heated copper plate 23 out of the furnace and cooling it to room temperature (300); Performing a brushing operation on both sides of the cooled copper plate (400); Drawing a heated stainless steel sheet and an aluminum sheet from a heating furnace and then laminating the stainless steel sheet / aluminum sheet / copper sheet / aluminum sheet / stainless steel sheet to form a five-layered laminate 500; Rolling the 5-layered laminated plate is made of 500.

In the 5-junction clad plate of the present invention manufactured through a series of such processes, the rolling is made so that a reduction ratio of 30 to 40% is given based on the aluminum plate, and the stainless steel plate and the aluminum plate during lamination for rolling Is a heated state, and the copper plate is cooled to room temperature.

In addition, if the reduction ratio of the aluminum plate during rolling does not reach 30%, sufficient bonding force may not be formed between the metal plates, and when the rolling rate exceeds 40%, the work hardening amount is excessive, resulting in poor workability of the final clad plate.

In addition, the brushing work performed on both sides of the aluminum plate and the copper plate may be replaced by sand blasting, and one side edge part may be welded in the state where the two metal plates are overlapped for convenience of operation when heating the stainless steel plate and the aluminum plate. When combined, the stainless steel plate and the aluminum plate can be treated like a single metal plate, thereby improving productivity.

As described above, the five-clad cladding plate of the present invention has a beautiful outer surface made of stainless steel plate, while the cross section of the copper plate having a unique color is exposed through the cross-section to improve decorative properties, and by the five-layer laminated structure Increased heat capacity has the advantage of preventing the heated foods such as ceramics or earthenware to cool down quickly.

In addition, the method of the present invention is expected to be able to reduce the production cost and significantly improve the productivity by minimizing the production equipment by heating each metal sheet in the atmosphere rather than reducing or vacuum.

Claims (3)

In the clad plate which joined the stainless steel plate, the aluminum plate, and the copper plate, the stainless steel plate 11, the aluminum plate 12 brushed on both surfaces, the copper plate 13 brushed on both surfaces, The five-layer laminated structure obtained by laminating and rolling the aluminum plate 12 and the stainless steel plate 11 which were brushed on the surface in a series order, between the stainless steel plate 11 and the aluminum plate 12, and an aluminum plate. A first oxide layer 11 ′ where an oxide layer of each of the surfaces of the stainless steel plate 11 and the aluminum plate 12 is matched between the copper plate 13 and the copper plate 13, and an oxide layer on the surface of the aluminum plate 12. A five-junction cladding plate, wherein a dioxide layer 12 'is interposed therebetween. Performing a brushing operation on both surfaces of the aluminum plate 12; The aluminum plate 12 and the stainless steel plate 11 are upright for 25 to 30 minutes at a temperature of 300 to 500 ° C. and the copper plate 13 at a temperature of 200 to 500 ° C. for 10 to 25 minutes. Heating each in a furnace (200); Pulling the heated copper plate 23 out of the furnace and cooling it to room temperature (300); Performing a brushing operation on both sides of the cooled copper plate (400); Extracting the heated stainless steel sheet and the aluminum sheet from the heating furnace and stacking the stainless steel sheet / aluminum sheet / copper plate / aluminum sheet / stainless steel sheet in the order of 500; Method for producing a five-junction clad plate characterized in that it comprises a step (500) of rolling the laminated stack laminated in five. The method for manufacturing a five-junction clad plate according to claim 3, wherein the rolling has a reduction ratio of 30 to 40% based on the aluminum plate.