JPH07120551B2 - Electromagnetic induction heating pan - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electromagnetic induction heating pan for cooking by electromagnetic induction heating, which is used in general households and the like.

Conventional technology As a pan cooked by electromagnetic induction heating, a pan in which stainless steel, iron and stainless steel are clad is generally used.
Since the inside of the pan was made of stainless steel, the food was sticky or burned, which made cooking and cleaning difficult.

Further, in order to solve the above problems, there is a pot in which a fluorine resin coat having non-adhesive properties is processed inside a pot in which Al100 series aluminum is clad inside and ferritic stainless steel is clad outside.

Problems to be Solved by the Invention In the above conventional electromagnetic induction heating pan, a fluorine resin coat is processed on the surface of the inner Al100 aluminum alloy, but the fluorine resin coat is volatile of various solvents during baking and baking, and fluorine. The presence of pinholes due to the meltability of the resin is unavoidable, and corrosion begins from these pinholes while using the pot. Corrosion progresses faster than conventional aluminum alloy single-piece pans with fluorocarbon resin coating, and moreover, corrosion progresses as pitting corrosion.

Aluminum alloy A containing 0.2% to 2.0% of Mn and Mg, for example A3004, does not provide sufficient clad bonding force even when clad with stainless steel, and cracks occur when it is drawn into a pot shape. There were challenges.

Furthermore, even aluminum alloys of the same thickness, for example, A300
4 has a thermal conductivity about 1.5 times worse than A1100 containing 99% or more of Al. Since the coil proximity portion that generates an alternating magnetic field due to electromagnetic induction has a higher temperature than other portions, problems such as burning or seizing occur during cooking unless the heat distribution is distributed to some extent.

In addition, when used as a pot for a rice cooker, there is a problem that the performance is not sufficiently obtained.

In order to disperse the heat distribution, A3004 needs to have a plate thickness 1.5 times that of A1100, which is heavy and costly.

The present invention is to solve the above problems, while suppressing the progress of corrosion from the pinhole to improve the corrosion resistance, this aluminum alloy with good corrosion resistance is used as a clad to form a clad with a material that causes electromagnetic induction heating and a high binding force. It is possible to draw.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention is an aluminum alloy having an aluminum alloy A containing 0.2% to 2.0% of Mn and Mg components respectively, an aluminum alloy B having Al 99% or more in the middle, The outer surface of the aluminum alloy A is clad-bonded with ferritic stainless steel.
Fluorine resin coated.

Further, the aluminum alloy B is thicker than the aluminum alloy A.

Function In the above-mentioned structure, the fluororesin coat cannot avoid the presence of pinholes due to the volatility of various solvents and the meltability of the fluororesin during baking. In addition, a material having a different electric potential between the aluminum alloy and the stainless steel is a clad that appears on the surface, and the existence of a potential difference is unavoidable. Furthermore, the pot is exposed to an alternating magnetic field due to electromagnetic induction, and the existence of a forced electric potential such as eddy current electron jumping is inevitable. In this way, it is considered that in a bad environment against corrosion, potential is concentrated on pinholes and pitting corrosion occurs. It is generally said that the A1100 series is superior in corrosion resistance, but if we look only at the corrosion resistance, the aluminum alloy containing Mn and Mg is superior. This is because it is considered that a solid solution of Mn exists and forms a metal baser than Al on the surface to suppress pitting corrosion.

In addition, aluminum alloy A containing 0.2% to 2.0% of Mn and Mg, respectively, such as A3004, does not provide sufficient clad bonding force even when clad bonded to stainless steel, and surface treatment, temperature, roll pressure, etc. Even if it is pressed into a small pot shape, cracks will occur. When high temperature and high pressure are applied during clad processing, Mn, Mg on the surface of aluminum alloy A
Is believed to have precipitated out of contact with the stainless steel. Al between this aluminum alloy A and stainless steel
When 99% or more of aluminum alloy B is put in and clad bonded,
Aluminum alloy A and aluminum alloy B are the same kind of metal and can be easily bonded by clad processing, and stainless steel and aluminum alloy B are clad bonded with stainless steel with a high Al purity of 99% and a high bonding strength. Since the content ratio of Mn and Mg precipitated on the surface at high temperature and high pressure is small, the clad bonding force is high, and cracking does not occur even when squeezed into a pot shape.

Furthermore, the stainless steel in the pan near the coil where an alternating magnetic field is generated by electromagnetic induction becomes hotter than other parts. Ideally, the local heating of the coil portion is dispersed by the heat conduction of the aluminum alloy so that the surface of the aluminum alloy A to be cooked is substantially uniform. However, Mn and Mg are 0.
Aluminum alloy A containing 2% to 2.0%, eg A3004 is Al
Aluminum alloy B containing 99% or more of Al, for example, aluminum alloy B with high thermal conductivity because its thermal conductivity is 1.5 times worse than A1100
The thickness of the plate is clad-bonded to be thicker than that of the aluminum alloy A to disperse the heat distribution and prevent burning or burning during cooking. Also, when used in an electromagnetic induction rice cooker, the heat of the pot becomes localized, and the convection of water does not occur in the entire pot but locally, and the part has a porridge-like finish, and the other part is hard and cored. Although it becomes rice that cannot be eaten, this problem is solved by clad-bonding the aluminum alloy B plate thickness to be thicker than the aluminum alloy A plate plate, and convection of water occurs in the entire pan to spread the rice. It can be cooked and cooked deliciously with less unevenness.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

An aluminum alloy Al containing 0.2% to 2.0% of Mn and Mg components and an aluminum alloy B2 containing 99% or more of Al are clad. Next, the ferritic stainless steel 3 heated by electromagnetic induction and the above-mentioned aluminum alloy two-layer clad material are roll-clad under high temperature and high pressure to form a flat clad material.

The aluminum alloy Al, the aluminum alloy B2, and the stainless steel 3 may be clad at the same time, or instead of the stainless steel 3, a material obtained by sandwiching iron heated by electromagnetic induction with stainless steel may be used.

After the flat clad material is drawn into a pot shape, the stainless steel 3 on the outer surface is polished to give a luster by removing scratches, burning color and drawing scratches from the clad roll, and thoroughly washed, and then blasted. Then, the surface of the aluminum alloy Al is made uneven and activated, and then the first layer of fluororesin 4 is coated and dried, and the second layer of top fluororesin is coated again, and baked and baked.

EFFECTS OF THE INVENTION With the above configuration, the present invention has a combined action of the presence of pinholes in the fluororesin coat, the clad material on the surface of which aluminum alloy and stainless steel have different potentials, and the presence of forced potential due to electromagnetic induction. However, the inclusion of Mn and Mg hardly causes pitting corrosion of the aluminum alloy A and improves the corrosion resistance.

Also, the Al content between the aluminum alloy A and stainless steel is 99%.
By sandwiching the above aluminum alloy B, the aluminum alloy A and the aluminum alloy B are the same kind of metal and have high clad bonding, and the stainless steel and the aluminum alloy B are high Al.
Since the content and the amount of Mn, Mg, etc. that precipitates on the surface are very small, clad bonding is performed with high bonding strength and cracks do not occur even when drawn into a pot shape.

Furthermore, by making the aluminum alloy B thicker than the aluminum alloy A, the local heating of electromagnetic induction is dispersed to reduce the heat distribution on the cooking surface, prevent burning and burning, and cook rice. Even if the rice is cooked evenly, it will be delicious.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of an electromagnetic induction heating pan showing an embodiment of the present invention. 1 ... Aluminum alloy A, 2 ... Aluminum alloy B, 3 ... Stainless steel, 4 ... Fluororesin, 5 ... Top fluororesin.

Claims (2)

[Claims] 1. An aluminum alloy A containing 0.2% to 2.0% of Mn and Mg components, respectively, and an Al content of 99% in the middle.
An electromagnetic induction heating pan in which the aluminum alloy B is clad-bonded to the outside with a layer of ferritic stainless steel or stainless steel and iron and stainless steel, and the aluminum alloy A is coated with a fluororesin. 2. The electromagnetic induction heating pan according to claim 1, wherein the aluminum alloy B is thicker than the aluminum alloy A.