KR20190008408A - An electromagnetic heating cooker and a method for manufacturing the same - Google Patents

Abstract

The present invention relates to the field of cooking utensils, and more specifically, an electromagnetically heated cooking utensil product and a manufacturing method for the same. The electromagnetically heated cooking utensil product includes a cooking utensil substrate (1) and a magnetic conduction layer (2) formed on at least one part of the outer surface of the cooking utensil substrate (1). The material of the magnetic conduction layer (2) is inserted in the cooking utensil substrate (1) in the form of continuous sawtooth structures on the interface formed by the contact of the cooking utensil substrate (1) and the magnetic conduction layer (2). The cooking utensil product manufacturing method includes the steps of: using an aerodynamic spray coating method to spray and coat magnetic powder to at least a part of the outer surface of the cooking utensil substrate to form a magnetic conduction layer; and forming an anti-corrosion layer on the magnetic conduction layer in a selective manner. The cooking utensil product manufactured by using the method ensures a strong bonding between the cooking utensil substrate and the magnetic conduction layer.

Description

TECHNICAL FIELD [0001] The present invention relates to an electromagnetic heating cooker and a method of manufacturing the same. BACKGROUND OF THE INVENTION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking tool field, and more particularly, to an electromagnetic heating cooking tool and a manufacturing method thereof.

Aluminum alloy, and 304 stainless steel are widely used in household appliances, but the electromagnetic heating function of these non-magnetic or weak self-conducting pots is not ideal. The conventional process of the inner pot of IH is 430 stainless steel thin plate put on the surface of aluminum alloy by most explosion welding or pressure welding method and magnetic 430 stainless steel of the pot is induction heating by the vortex effect formed under the action of high frequency alternating magnetic field do. However, the process is relatively complex and costly. In addition, one layer of a magnetically conductive metal layer may be formed on the bottom of the pot by a method such as thermal spray coating, for example, arc or plasma spray coating, to implement the electromagnetic heating function of these pots. However, thermal spray coatings are extremely slow in temperature, magnetic alloy materials are easily oxidized, and metal wires or iron powders collide with the surface of a pot substrate in a molten or semi-molten state and a low air pressure. Further, the formed magnetic layer is formed on the surface of an aluminum alloy substrate (generally, the roughness of the sanding surface of the aluminum alloy is 3 to 8 占 퐉) requiring sanding treatment, so that the iron is hardly inserted into the substrate. Therefore, the bonding strength between the heat-spray coated iron layer and the aluminum substrate is reduced. When the thermal spray coated self-conductive layer is increased to a certain thickness (for example, 0.3 to 0.6 mm), the surface roughness is significantly increased (for example, 20 to 60 탆) The bonding strength of the prevention layer is remarkably reduced.

It is an object of the present invention to provide an electromagnetic heating cooking tool and a manufacturing method thereof for solving the problem of deteriorating the bonding force between the magnetic conductive layer and the cooking tool substrate and between the rust prevention layer and the magnetism conductive layer in the conventional electromagnetic cooking appliance .

In order to achieve the above object, one aspect of the present invention provides an electromagnetic heating cooker. Wherein the cooking utensil comprises a cooking utensil substrate and a magnetically conductive layer formed on at least a portion of the outer surface of the cooking utensil substrate, wherein at the interface where the cooking utensil substrate and the magnetically conductive layer are in contact, Is inserted into the cooking utensil substrate in a first continuous serrated configuration.

Preferably, the cooking tool further comprises an anti-rust layer formed on at least a portion of the surface of the magnetically conductive layer, wherein the material of the anti-rust layer at the interface between the magnetically conductive layer and the rust preventive layer is a second continuous serrated structure Is inserted into the magnetically conductive layer.

Preferably, the maximum height difference between the tooth tip and tooth bottom in the first continuous serrated structure is greater than the maximum height difference between the tooth tip and tooth bottom in the second continuous serrated structure.

Preferably, in the first continuous serrated structure, the maximum height difference between the tooth tip and the tooth bottom is 10 to 80 占 퐉, and the tooth width is 10 to 80 占 퐉.

Preferably, in the second continuous serrated structure, the maximum height difference between the tooth tip and tooth bottom is 5 to 15 占 퐉, and the tooth width is 10 to 30 占 퐉.

Preferably, the thickness of the magnetically conductive layer is 0.1 to 0.6 mm.

Preferably, the magnetically conductive layer and the rust prevention layer are formed on the bottom of the cooking utensil substrate, or on the side walls adjacent the bottom and bottom of the utensil substrate.

Preferably, the magnetically conductive layer is formed of a magnetic iron alloy; The magnetic iron alloy is at least one of Fe to C alloy, Fe to Si alloy and Fe to Mn alloy, and the Fe content of the magnetic iron alloy is 95 wt% or more.

Preferably, the material of the cooking utensil substrate is a nonmagnetic or weakly magnetically conductive material, preferably an aluminum alloy or 304 stainless steel.

Another aspect of the present invention provides a method of manufacturing the electromagnetic heating cooker described above,

(1) spray coating a magnetic powder onto at least a portion of an outer surface of a cooking utensil substrate by aerodynamic spray coating to form a self-conducting layer, and controlling the thickness of formation of the self- The material of the magnetically conductive layer is inserted into the cooking tool substrate in a continuous serration structure at an interface at which the layer is in contact and has a serrated structure continuous to the surface of the magnetically conductive layer; And

(2) forming a rust prevention layer on the magnetic conductive layer.

Preferably, the thickness of the magnetic conductive layer is 0.1 to 0.6 mm.

Preferably, the magnetic powder has a particle diameter of 10 to 50 mu m.

Preferably, the aerodynamic spray coating method includes spraying pressure of 1 to 5 MPa, spraying distance of 10 to 50 mm, and gas heating temperature of 200 to 1000 ° C.

In the electromagnetic heating cooking tool according to the present invention, the material of the magnetically conductive layer is inserted into the cooking tool substrate in a continuous serration structure, and the material of the rust prevention layer is inserted into the magnetic conductive layer in a continuous serrated structure , A strong bonding force is provided between the magnetically conductive layer and the cooking tool substrate and between the magnetically conductive layer and the rust preventive layer, so that the magnetic conductive layer and the rust preventive layer can be secured easily so as not to fall off or rupture.

The method of manufacturing the electromagnetic heating cooking tool according to the present invention is characterized in that a magnetic conductive layer is formed by an aerodynamic spray coating method and defects such as oxides or crevices are formed on the contact interface between the magnetic conductive layer and the cooking tool substrate By virtue of being essentially absent, the self-conducting layer is better able to transfer the heat generated during electromagnetic heating to the cooking utensil substrate, thereby increasing the temperature uniformity of the cooking utensil substrate and thus obtaining a good electromagnetic heating effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial schematic view of a cooking appliance according to the present invention; FIG.
Fig. 2 is a partially enlarged schematic view of the cooking appliance shown in Fig. 1; Fig.
Figure 3 is a partial enlarged schematic view of the contact interface between the self-conductive layer and the cooking utensil substrate shown in Figure 2;
4 is a partial enlarged schematic view of the contact interface between the antirust layer and the magnetically conductive layer shown in Fig.

In the present invention, the term "upper" and "lower" generally refer to the upper and lower sides shown in the reference drawings, and "inner" and "outer" It refers to the inside and outside of the self contour.

1 to 4, an electromagnetic heating cooking tool according to the present invention comprises a cooking appliance substrate 1, a magnetic conductive layer 2 formed on at least a part of an outer surface of the cooking appliance substrate 1, (3) formed on at least a part of the surface of the conductive layer (2). Wherein the material of the magnetically conductive layer (2) at the interface between the cooking utensil substrate (1) and the magnetically conductive layer (2) has a first continuous serration structure in the cooking tool substrate And the material of the antirust layer 3 is inserted into the magnetically conductive layer 2 in a second continuous serrated structure at the interface where the antistatic layer 3 is in contact with the magnetically conductive layer 2.

In the term " continuous serrated structure ", "continuous" indicates that each tooth of the serrated structure is arranged continuously, and that there is basically no platform shape (that is, a laminated sheet shape) between two adjacent teeth Point. The serrations are not limited to serrations of strict geometric meaning, but may be combinations of various irregular shapes similar to serrations.

In a preferred case, the maximum height difference between the tooth tip and the tooth bottom in the first continuous serrated structure is greater than the maximum height difference between the tooth tip and tooth bottom in the second continuous serrated structure. In other words, the roughness formed by the first continuous serration structure is larger than the roughness formed by the second continuous serration structure.

In the first continuous serrated structure, the maximum height difference DELTA H1 between the tooth tip and the tooth bottom is preferably 10 to 80 mu m. In other words, the depth of the material of the self-conductive layer 2 inserted into the cooking utensil substrate 1 is preferably 10 to 80 占 퐉, and specifically, for example, 10 占 퐉, 15 占 퐉, 20 占 퐉, 45 mu m, 50 mu m, 55 mu m, 60 mu m, 65 mu m, 70 mu m, 75 mu m, 80 mu m and any numerical value within a range composed of any two of these numerical values. Further, preferably, the maximum height difference between the tooth tip of the serration structure and the tooth bottom is 15 to 70 mu m, more preferably 20 to 70 mu m, further preferably 20 to 60 mu m.

In the first continuous serrated structure, the tooth width (DELTA L1) of the serration structure is preferably 10 to 80 mu m. Specifically, for example, 10 占 퐉, 15 占 퐉, 20 占 퐉, 25 占 퐉, 30 占 퐉, 35 占 퐉, 40 占 퐉, 45 占 퐉, 50 占 퐉, 55 占 퐉, 60 占 퐉, 65 占 퐉, 70 占 퐉, And any number within the range consisting of any two of these numbers. Further preferably, the tooth width of the serration structure is 20 to 60 탆, more preferably 20 to 50 탆. The tooth width of the serrated structure indicates the horizontal distance between two adjacent bottom teeth.

In the second continuous serrated structure, the maximum height difference DELTA H2 between the tooth tip and the tooth bottom is preferably 5 to 15 mu m. In other words, the depth of the material of the antirust layer 3 inserted into the magnetically conductive layer 2 is preferably 5 to 15 占 퐉. Specifically, for example, in the range of 5 mu m, 6 mu m, 7 mu m, 8 mu m, 9 mu m, 10 mu m, 11 mu m, 12 mu m, 13 mu m, Lt; / RTI > Furthermore, preferably, the maximum height difference between the tooth tip and tooth bottom of the serration structure is 6 to 12 탆, more preferably 8 to 10 탆.

In the second continuous serrated structure, the tooth width (DELTA L2) of the serration structure is preferably 10 to 30 mu m. More specifically, for example, in the range of 10 탆, 12 탆, 14 탆, 16 탆, 18 탆, 20 탆, 22 탆, 24 탆, 26 탆, 28 탆, 30 탆, Lt; / RTI > Further preferably, the tooth width of the serration structure is 12 to 25 탆, more preferably 15 to 25 탆. The tooth width of the serrated structure indicates the horizontal distance between two adjacent bottom teeth.

In the present invention, the thickness of the magnetically conductive layer 2 may be 0.05 to 1 mm. Specifically, for example, 0.05 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.23 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.31 mm, 0.32 mm, 0.33 mm, , 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.4 mm, 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm, 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, a range consisting of any two of these numerical values, in the range of 0.5 mm, 0.52 mm, 0.53 mm, 0.54 mm, 0.55 mm, 0.56 mm, 0.57 mm, 0.58 mm, 0.59 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.8 mm, Lt; / RTI > Further preferably, the thickness of the magnetically conductive layer 2 is 0.1 to 0.6 mm, more preferably 0.3 to 0.6 mm.

In the present invention, the formation position of the magnetically conductive layer (2) can be determined according to a conventional method in the art. For example, the self-conductive layer 2 is formed on the bottom of the cooking utensil substrate 1 or on the side walls adjacent to the bottom and bottom of the cooking utensil substrate 1. In a preferred embodiment, the magnetically conductive layer (2) is formed on the sidewall adjacent to the bottom and bottom of the cooking utensil substrate (1), and the magnetically conductive layer formed on the bottom and the self- Structure. In the preferred embodiment described above, the height of the magnetically conductive layer formed on the sidewall occupies at least 5% of the total height of the cooking utensil substrate, preferably at least 10%, more preferably at least 15% 20% or more, and most preferably 20 to 60%.

In the present invention, the magnetically conductive layer 2 may be formed of a conventional magnetic material in this field. In the preferred case, the magnetically conductive layer 2 is formed of a magnetic iron alloy. The magnetic iron alloy may be at least one of Fe to C alloy, Fe to Si alloy, and Fe to Mn alloy. In the magnetic iron alloy, the Fe content may be 95 wt% or more, preferably 95 to 99.5 wt%, more preferably 96 to 99 wt%, and still more preferably 96 to 98.5 wt%.

In the present invention, the material of the cooking utensil substrate 1 may be a conventional choice in the art. For example, a conventional non-magnetic or weakly self-conducting material in the art. In a preferred embodiment, the material of the cooking utensil substrate 1 is selected from aluminum alloys or 304 stainless steels in order to match the magnetically conductive layer 2 to obtain a good electromagnetic heating effect.

In the present invention, the bonding force between the self-conductive layer (2) and the cooking tool substrate (1) may be 30 to 50 MPa. Specifically, for example, the values of 30 MPa, 31 MPa, 32 MPa, 33 MPa, 34 MPa, 35 MPa, 36 MPa, 37 MPa, 38 MPa, 39 MPa, 40 MPa, 41 MPa, 42 MPa, 43 MPa, 44 MPa, 45 MPa, 46 MPa, 47 MPa, 48 MPa, 49 MPa, And may be any number within the range consisting of any two of the above. Preferably, the bonding force between the self-conductive layer 2 and the cooking tool substrate 1 is 35 to 50 MPa, and more preferably 37 to 45 MPa. In the present invention, the bonding force between the self-conductive layer 2 and the cooking tool substrate 1 is detected according to the method described in " Testing Tensile Bond Strength According to GB / T 8642 to 2002 Thermal Spray Coating ".

In the present invention, the antirust layer 3 may cover a part of the magnetically conductive layer 3 and completely cover the magnetically conductive layer 2. The thickness of the antirust layer 3 may be 0.02 to 0.08 mm, preferably 0.03 to 0.05 mm. The rust preventive layer 3 may be a single layer or a multi-layer structure formed of a conventional rust preventive coating material in the art. The rust preventive coating material may be at least one selected from the group consisting of, for example, a silicone resin, a fluororesin, an epoxy resin, and a resin composition containing an aluminum powder or a zinc powder, and preferably a fluororesin and / .

In the present invention, the bonding force between the rust preventive layer 3 and the magnetically conductive layer 2 may be 5B. The bonding strength between the antirust layer 3 and the magnetic conductive layer 2 is determined by the method specified in GB / T 9286 Cross-cut test of color paint and varnish paint film (GB / T 9286 color lacquer lacquer lacquer film) .

In the present invention, the electromagnetic heating cooking utensil may be any of various conventional cooking utensils for heating using electromagnetic cookers such as an electric pressure cooker, an electric rice cooker, an electric frying pan, a frying pan, a pot and an electromagnetic furnace.

According to the present invention, there is provided a method of manufacturing an electromagnetic heating cooking tool,

(1) spraying a magnetic powder onto at least a portion of an outer surface of a cooking utensil substrate by a gas dynamic spray method to form a magnetically conductive layer, and controlling the thickness of the formed magnetically conductive layer, Wherein the material of the magnetically conductive layer at the interface between the substrate and the magnetically conductive layer is inserted into the cooking tool substrate in a continuous serration structure and a serrated structure is provided on the surface of the magnetically conductive layer Step and

(2) forming a rust prevention layer on the magnetic conductive layer.

In the present invention, the method of forming the magnetic conductive layer is an aerodynamic spray coating method and may be referred to as a cold spray method. Since the magnetic conductive layer formed by the spray coating method basically does not generate oxidation and the magnetic powder can collide with the cooking tool substrate at a speed near double the speed of sound under high-speed air pressure, the coating layer has very high denseness have. It is also possible to form a sawtooth structure on the surface of the cooking utensil substrate by impact, so that a very strong bonding force can be formed between the self-conductive layer and the cooking utensil substrate.

In the present invention, the thickness of the magnetic conductive layer is 0.3 to 0.6 mm. When the thickness of the magnetic conductive layer reaches 0.3 to 0.6 mm, the surface roughness value of the magnetically conductive layer is maintained at a comparatively small value, and a continuous serrated structure is formed. Between the antirust layer and the magnetically conductive layer So as to have a strong coupling force.

In the present invention, in order to form a sawtooth structure having a specific size (i.e., the maximum height difference between the tooth tip and tooth bottom and the tooth width) in the cooking tool substrate, the grain size of the magnetic powder is preferably 10 To 50 탆, more preferably 10 to 40 탆, and still more preferably 20 to 40 탆. The magnetic powder may be a magnetic iron alloy as described above.

In the present invention, the operating conditions of the aerodynamic spray coating method may include an injection pressure of 1 to 5 MPa, an injection distance of 10 to 50 mm and a gas heating temperature of 200 to 1000 ° C. In an embodiment of the aerodynamic spray coating method, the working gas is a nitrogen gas, a helium gas or a mixed gas thereof, an injection pressure of 1 to 5 MPa, a gas heating temperature of 200 to 1000 ° C, A speed of 1 to 2 m ³ / min, a powder conveying speed of 5 to 15 kg / h, a spraying distance of 10 to 50 mm, a consumption power of 5 to 25 kW, and a powder particle size of 10 to 50 μm. For example, the injection pressure may be 1 MPa, 1.5 MPa, 2 MPa, 2.1 MPa, 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa, 2.6 MPa, 2.7 MPa, 2.8 MPa, 2.9 MPa, 3 MPa, 3.1 MPa, , 3.3 MPa, 3.4 MPa, 3.5 MPa, 3.6 MPa, 3.7 MPa, 3.8 MPa, 3.9 MPa, 4 MPa, 4.5 MPa, 5 MPa and any numerical value within the range consisting of any two of these numerical values. Preferably, the injection pressure is 2 to 4 MPa. In this specification, the pressure refers to absolute pressure. The gas heating temperature may be, for example, 200 ° C., 300 ° C., 400 ° C., 450 ° C., 500 ° C., 550 ° C., 600 ° C., 650 ° C., 700 ° C., 750 ° C., 800 ° C., 850 ° C., Lt; RTI ID = 0.0 > C, < / RTI > and any two of these numbers. Preferably, the gas heating temperature is 500 to 900 ° C, and more preferably 600 to 800 ° C. The ejection distance may be any number within a range of, for example, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm and any two of these numerical values. Preferably, the ejection distance is 20 to 50 mm, more preferably 30 to 50 mm.

In the present invention, the method of manufacturing the cooking utensil includes the steps of deicing and degreasing the cooking utensil substrate prior to cold spray coating (i.e., aerodynamic spray coating) the utensil substrate, And maintaining the cleanliness of the apparatus.

According to a preferred embodiment of the present invention,

(1) a step of performing deaeration and degreasing treatment on the surface of the cooking utensil substrate to maintain the cleanliness of the surface thereof

(2) spraying the magnetic powder onto at least a part of the outer surface (preferably the bottom or bottom and the side wall) of the cooking utensil substrate after the treatment of step (1) using an aerodynamic spray coating method, Forming a self-conductive layer of 0.3 to 0.6 mm on the straight

(3) defoaming and degreasing the cookware substrate having the self-conductive layer formed thereon, and thereafter spray coating the rust-preventive protective coating layer on the self-conductive layer.

Hereinafter, embodiments of the present invention will be described in detail with reference to examples and comparative examples.

Examples 1 to 6

The surface of the cooking utensil substrate was degreased and degreased to maintain its surface cleanliness. The magnetic powder was spray coated onto the bottom of the cooking utensil substrate using aerodynamic spray coating to form a self-conducting layer. The cooking tool substrate on which the self-conductive layer was formed was degassed and degreased, and then the rust-preventive protective coating layer was spray coated on the magnetic conductive layer. Table 1 shows the operating conditions and the magnetic powders in the aerodynamic spray coating process. Refer to "GB / T 15748-1995 Quantitative Gold Hand-Held Measuring Method (GB / T 15748-1995 Manual Measuring of Quantitative Metallography)", the contact interface between the magnetically conductive layer and the cooking tool substrate value width of the tooth-like structure formed in (△ L ₁₎ and the value means ttaegi with values up to a height difference between the floor (△ H _1), and value width of the tooth-like structure formed at the contact interface between the recording layer and the magnetic conductive layer (△ L ₂₎ and the value means ttaegi the value was detected up to a height difference (△ H ₂₎ between the bottom "GB / T 8642 ~ 2002 test of the bond strength of the thermal spray coating (GB / T 8642 ~ 2002抗The test was carried out in accordance with the method specified in "GB / T 9286 Color Paint and Baskini Paint Film Cross-Cut Test" to detect the bond strength between the self-conductive layer and the cooking tool substrate according to the method specified in " Detecting the bonding force between the barrier layer and the magnetically conductive layer Respectively. The detection results are shown in Table 2.

Comparative Example 1

A cookware was prepared according to the method of Example 6. However, this was different from Example 6 in that a spray coating process for forming a magnetic conductive layer was performed using a thermal spray coating method. The bonding strength between the self-conductive layer and the cooking tool substrate was detected according to the method described in "Testing of Tensile Bond Strength According to GB / T 8642 ~ 2002 Thermal Spray Coating ", and the" GB / T 9286 color paint and varnish paint film Cross-cut test ", the bond strength between the rust prevention layer and the magnetic conductive layer was detected. The detection results are shown in Table 2.

number Magnetic powder type Magnetic powder
Fe content Magnetic powder
Average particle diameter Gas heating
Temperature jet
pressure Spray coating
Street Example 1 Fe ~ C alloy 96 wt% 15 탆 600 ℃ 2 MPa 30mm Example 2 Fe ~ Si alloy 96.5 wt% 25 m 0 ℃ 2.5 MPa 40mm Example 3 Fe ~ Mn alloy 97 wt% 35 탆 600 ℃ 3 MPa 50mm Example 4 Fe ~ C alloy 96 wt% 15 탆 800 ° C 2 MPa 30mm Example 5 Fe ~ Si alloy 96.5 wt% 25 m 800 ° C 3 MPa 40mm Example 6 Fe ~ Mn alloy 97 wt% 35 탆 800 ° C 4 MPa 50mm

number magnetism
Conductive layer
Thickness (mm) Self-conductive layers and cooking utensils
Between substrate Between the antirust layer and the magnetically conductive layer DELTA H ₁ / m △ L ₂ / ㎛ Bonding force / MPa DELTA H ₁ / m △ L ₂ / ㎛ cohesion Example 1 0.3 31 32 37 6 6 5B Example 2 0.35 38 39 39 8 9 5B Example 3 0.4 42 43 42 7 8 5B Example 4 0.45 38 39 43 9 10 5B Example 5 0.5 43 43 44 11 11 5B Example 6 0.6 45 46 45 12 11 5B Comparative Example 1 0.6 ~ ~ 22 ~ ~ 4B

As can be seen from the data in the above Table 2, in the cooking apparatus manufactured according to the method of the present invention, both the magnetic conductive layer and the cooking tool substrate and between the rust prevention layer and the magnetic conductive layer both have strong bonding force. Although the preferred embodiments of the present invention have been described in detail in connection with the preferred embodiments of the present invention, it should be understood that the present invention is not limited to the specific details of the embodiments described above and various modifications are possible within the technical scope of the present invention. And all such simple modifications are within the scope of the present invention.

It should also be noted that each concrete element described in the above-mentioned specific embodiments can be combined in any suitable manner in a non-contradictory situation. In order to avoid unnecessary duplication, the present invention will not be described further with respect to various possible combinations.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1: Kitchen utensils
2: Self-conductive layer
3: antirust layer

Claims (15)

In an electromagnetic heating cooker,
Wherein the cooking utensil comprises a cooking utensil substrate (1) and a self-conductive layer (2) formed on at least a portion of an outer surface of the cooking utensil substrate (1)
Wherein the material of the magnetically conductive layer (2) at the interface between the cooking tool substrate (1) and the magnetically conductive layer (2) is inserted into the cooking tool substrate (1) in a first continuous serrated configuration ,
The magnetic conductive layer 2 is formed by spray coating a magnetic powder onto at least a part of the outer surface of the cooking utensil substrate 1 by an aerodynamic spray coating method.
Cooking tools. The method according to claim 1,
The cooking utensil further comprises a rust prevention layer (3) formed on at least a part of the surface of the magnetically conductive layer (2)
Wherein the material of the antirust layer (3) at the interface between the magnetically conductive layer (2) and the antirust layer (3) is inserted into the antistatic layer (2) with a second continuous serrated structure. 3. The method of claim 2,
Wherein the maximum height difference between the tooth tip and tooth bottom in the first continuous serrated structure is greater than the maximum height difference between the tooth tip and tooth bottom in the second continuous serrated structure. The method according to claim 1,
Wherein the maximum height difference between the tooth tip and the tooth bottom in the first continuous serrated structure is 10 to 80 占 퐉 and the tooth width is 10 to 80 占 퐉. 3. The method of claim 2,
Wherein the maximum height difference between the tooth tip and the tooth bottom in the second continuous serrated structure is 5 to 15 占 퐉 and the tooth width is 10 to 30 占 퐉. The method according to claim 1,
Wherein the thickness of the magnetically conductive layer (2) is 0.1 to 0.6 mm. 3. The method of claim 2,
The self-conductive layer 2 and the rust prevention layer 3 are formed on the bottom of the cooking utensil substrate 1 or on the side walls adjacent to the bottom and bottom of the cooking utensil substrate 1, Cooking tools. The method according to claim 1,
Wherein the magnetically conductive layer (2) is formed of a magnetic iron alloy. 9. The method of claim 8,
Wherein the magnetic iron alloy is at least one of Fe to C alloy, Fe to Si alloy and Fe to Mn alloy, and the Fe content of the magnetic iron alloy is 95 wt% or more. The method according to claim 1,
Wherein the material of the cooking utensil substrate (1) is a non-magnetic or weak self-conductive material. 11. The method of claim 10,
Wherein the material of the cooking utensil substrate (1) is an aluminum alloy or 304 stainless steel. The method of manufacturing a cooking appliance according to any one of claims 1 to 11,
The method comprises:
(1) controlling the thickness of the formation of the magnetically conductive layer so that the material of the magnetically conductive layer is inserted into the cooking tool substrate in a continuous serration structure at the interface where the cooking tool substrate and the magnetically conductive layer are in contact, Providing a continuous serrated structure on the surface of the magnetically conductive layer; And
(2) forming a rust prevention layer on the magnetic conductive layer
≪ / RTI > 13. The method of claim 12,
Wherein the thickness of the magnetic conductive layer is 0.1 to 0.6 mm. 13. The method of claim 12,
Wherein the magnetic powder has a particle diameter of 10 to 50 mu m. 13. The method of claim 12,
The aerodynamic spray coating method includes a spraying pressure of 1 to 5 MPa, a spraying distance of 10 to 50 mm, and a gas heating temperature of 200 to 1000 ° C.

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