JP2002282128A - Container made of aluminum for electromagnetic cooker and method for manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container made of aluminum for an electromagnetic cooker, and a method for manufacturing it by which the service life is prolonged and the life of an electrolyte used in a manufacturing process is also prolonged. SOLUTION: In an aluminum pot main body 10 having an iron system member 40 joined to a bottom surface on an outer side, an anodic oxide film 50 is formed on the surface of aluminum except the member 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum electromagnetic cooker container and a method for producing the same, and more particularly, to an aluminum electromagnetic cooker pan, for example.
The present invention relates to a container for an electromagnetic cooker such as a frying pan or a rice cooker and a method for producing the same. Note that, here, aluminum means aluminum in a broad sense including aluminum or an aluminum alloy.

[0002]

2. Description of the Related Art In general, as a container for an electromagnetic cooker such as a pot or a frying pan, a member called a circular plate made of aluminum and stainless steel is welded or pressure-bonded to the outer bottom surface of a stainless steel container body. I have.

However, as described above, since the container body made of stainless steel is heavy, handling is inconvenient. Therefore,
In recent years, a container body made of lightweight and rust-resistant aluminum and having a circular plate made of aluminum and stainless steel welded or pressure-bonded to its outer bottom surface has been widely used. The aluminum electromagnetic cooker container has a fluororesin coating on the inner surface and a heat-resistant coating on the outer surface.

[0004]

However, the conventional aluminum electromagnetic cooker container has a problem that its useful life is short because the inner surface is made of fluororesin.

As a method for solving this problem, it is conceivable to apply an anodized film generally called alumite to the surface of aluminum. However, when alumite treatment (anodizing treatment) is applied by surface treatment in a state where a circle plate made of aluminum and stainless steel is welded or pressure-bonded to the aluminum container body, the influence of current and acid in the sulfuric acid (H2SO4) electrolytic cell is increased. In addition to dissolving the stainless steel, furthermore, the iron content melts in the electrolytic solution and lowers the alumite performance,
There is a problem that the liquid life is shortened.

The present invention has been made in view of the above circumstances, and has been made in consideration of the above circumstances, and has been made to increase the life of a product and to increase the life of an electrolytic solution used for processing in a manufacturing process. A container for dexterity and a method for producing the same are provided.

[0007]

In order to achieve the above object, an invention according to claim 1 is an electromagnetic cooker container in which an iron-based member is joined to an outer bottom surface of an aluminum container body. An anodized film is formed on the surface of aluminum other than the iron-based member in the main body.

In the present invention, the iron-based member is not particularly limited as long as it is an iron-based material having a function as a heating element of a container for an electromagnetic cooker. For example, an iron-based member such as stainless steel or soft iron may be used. it can.

With this configuration, an anodic oxide film is formed on the aluminum surface of the container body other than the joined iron-based members, so that the product life of the container can be increased.

[0010] The invention according to claim 2 is that, after the iron-based member is joined to the outer bottom surface of the aluminum container main body, the iron-based member is covered from the outside, and the aluminum-based member is coated on the surface of aluminum other than the iron-based member. An anodic oxidation treatment is performed to form an anodic oxide film.

The invention according to claim 3 is a step of joining an iron-based member to the outer bottom surface of an aluminum container body, a step of covering the iron-based member from outside with a covering member, Performing an anodizing treatment on the aluminum surface of the container body in a state where the member is covered to form an anodized film. In this case, in the step of coating the iron-based member from the outside with the coating member, the iron-based member is surrounded by a coating member that surrounds a seal member that is in close contact with the surface of the container body and the peripheral edge of the iron-based member. Then, the space between the iron-based member and the covering member is set to a negative pressure with respect to the outside, and thereafter, the covering member can be covered with a negative pressure state (claim 4).

According to the second and third aspects of the present invention, the iron-based member joined to the container body is covered from the outside and the iron-based member is not subjected to the anodizing treatment, so that it is used for the anodizing treatment. The iron-based component does not melt under the influence of sulfuric acid (acid), which is an electrolytic solution, and current, and does not melt in the electrolytic solution. Therefore,
The electrolytic processing performance can be improved, and the life of the electrolytic solution (processing liquid) can be increased, so that the product life can be increased and the processing efficiency can be improved. Further, since the amount of the electrolyte used can be reduced, the cost can be reduced.

In this case, in the step of coating the iron-based member from the outside with the coating member, the iron-based member is formed by using a coating member surrounding the seal member that is in close contact with the surface of the container body and the peripheral edge of the iron-based member. And the space between the iron-based member and the covering member is negatively pressured with respect to the outside, and then the covering member is covered under a negative pressure state, so that the covering of the covering member can be easily and reliably performed. In addition, the formation of the anodic oxide film on the container body can be easily and reliably performed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of an aluminum electromagnetic cooker container according to the present invention will be described in detail with reference to the accompanying drawings. Here, the case where the electromagnetic cooker container is a one-handed pressure cooker will be described.

FIG. 1 is an enlarged sectional view showing a part of a pressure cooker which is an example of a container for an electromagnetic cooker according to the present invention, and FIG.
FIG. 3 is an enlarged sectional view showing a part of the pot body which is a container body, and FIG. 3 is a plan view showing a part of the pot body in cross section. Figure (b) and arrow II
It is a principal part side view of (c).

In the pressure cooker (hereinafter referred to as a pan), an iron-based member 40 to be described later is joined to the outer surface of the flat bottom 11, and an anodic oxide film 50 is formed on a surface other than the iron-based member 40.
An aluminum pot body 10 (container body) having
It is mainly constituted by an aluminum lid 20 which is removably closed by the opening 12 of the pot body 10.

The pot main body 10 has a stepped flange 15 in which wide portions 13 and narrow portions 14 are alternately arranged on the periphery of the opening 12. In addition, mounting brackets 32a and 32b formed of, for example, aluminum die-casting are respectively provided on opposed outer peripheral surfaces on the opening side of the pan main body 10 with mounting holes 16 (FIG. 2, see FIG. 3). A handle main body 30 having a handle portion 33 for grip is attached to one of the mounting brackets 32a by screws 34, and a finger hook 35 is mounted to the other mounting bracket 32b.
Is attached by a screw 36. In addition, the lid body 20 is attached to the
A pressure holding member 37 fixed and held at 0 is movably attached to a holding position and a non-holding position of the lid 20. In this case, the handle body 30, the auxiliary handle 31, and the pressing and holding member 3
7 is made of a heat-resistant thermosetting synthetic resin such as a phenol resin, which can be injection-molded.

The lid 20 is provided with a hanging piece 21 surrounding the stepped flange 15 of the pot body 10, and a nozzle 22 for discharging internal steam to the outside and a pressure adjusting nozzle Weight 23 is mounted, and a safety valve 24 is mounted at one location on the outer peripheral side.

An iron-based member 40 that generates heat during electromagnetic cooking is provided on the outer bottom surface of the pot body 10 of the pot configured as described above.
Are joined. The iron-based member 40 is formed of, for example, a member in which an aluminum layer 42 for improving the wettability of a brazing material is provided on the surface of stainless steel 41. In order to provide the aluminum layer 42 on the surface of the stainless steel 41, for example, there is a method of joining the two by rolling, or a method of hot-dip plating the stainless steel 41 with aluminum. The thickness of the aluminum layer 42 is preferably set to, for example, 10 μm or more in order to efficiently secure good wettability of the brazing material.

As the brazing filler metal to be joined, for example, a brazing filler metal containing Zn and Si in aluminum can be used. In addition, a flux (not shown) is used for brazing to suppress oxidation of each part.

In the above description, the case where the joining of the iron-based member 40 is brazing has been described, but instead of brazing, at least the peripheral edge of the joining surface between the pot body 10 and the iron-based member 40 is friction stir-coated. Joining may be performed. That is, the pot body 10 and the iron-based member are moved by sliding and moving a tool made of a material harder than the pot body 10 and the iron-based member 40 as one of the members to be joined while slidingly contacting one of the members to be joined such as the pan body 10. 40 can be joined.

Next, a procedure for applying the anodic oxide film 50 to the pot body 10 will be described with reference to FIGS. First, as shown in FIG. 4 (a), with the bottom 11 of the pot body 10 positioned upward, as shown in FIG. 4 (b), iron is placed on the outer surface of the bottom 11 of the pot body 10. System member 40
(Stainless steel 41 having aluminum layer 42) is joined by brazing, friction stir welding, or the like (step 10).
-1, see FIG. 5).

After the iron-based member 40 is joined to the bottom 11 of the pot body 10, the pot body 10 is
(Masking) the iron-based member 40 bonded to the substrate from the outside (step 10-2). At the time of this coating (masking) step, as shown in FIG. 6, a sealing member such as O, which is in close contact with the surface of the pot body 10 and the peripheral edge of the iron-based member 40,
A ball valve 62 that surrounds the iron-based member 40 by using a disk-shaped covering member 60 surrounding the ring 61 and that is fitted and inserted into a through hole 60 a formed in the center of the covering member 60. A vacuum pump 66 is connected to the coupler 63 via a hose 65 provided with an opening / closing valve 64.
Is operated to make the space between the iron-based member 40 and the covering member 60 a negative pressure with respect to the outside. I do.

Next, the pot body 10 masked by the covering member 60 is framed (step 10-3). In order to frame the pot body 10, as shown in FIG. 7, a connecting fitting 73 is provided between upper and lower opposing pieces 72 a and 72 b of a rectangular holding frame 72 suspended by a hanging fixture 71 on a beam 70.
Thus, a plurality of, for example, four pot bodies 10 can be framed. In this case, the connection fitting 7 formed in a substantially S-shape
3 is a mounting hole 16 provided on the opening side of the pot body 10.
(See FIGS. 2 and 3), the pot main body 10 is
Can be installed inside. In this manner, a plurality of sets of the holding frames 72 are suspended from the beam 70. At the end of the beam 70, a feeder 74 connected to an anode terminal (not shown) is provided. In addition, the beam 70, the suspension metal fitting 71, the holding frame 72, and the connecting metal fitting 73 are formed of a conductive material such as aluminum.

The framed pot body 10 is immersed in a treatment tank (not shown) in which sulfuric acid is stored to remove or degrease surface dirt such as oil (step 10-4).
Next, after being immersed in a washing tank (not shown) and subjected to a washing treatment (step 10-5), it is immersed in a treatment tank (not shown) in which sodium hydroxide is stored, and the surface of the pot body 10 is treated. And an etching process for removing small scratches is performed (step 10-6). The pot body 10 that has been subjected to the etching process is again subjected to a water washing process (step 1).
After 0-7), the substrate is immersed in a treatment tank (not shown) in which sulfuric acid is stored, neutralized, and the smut generated by etching is removed (step 10-8).

Next, as shown in FIGS. 7 and 8, the electrolytic solution 81 (sulfuric acid) is immersed in an electrolytic tank 80 which is a processing tank in which the electrolytic solution 81 (sulfuric acid) is stored. Anodized film 50 (alumite) is formed on the surface of aluminum other than coating member 60 of pot body 10 by electrolysis between counter electrode plate 82 connected to the formed cathode terminal (not shown). (Step 10-9).

In the anodizing step, the iron-based member 40
(Stainless steel 41 having an aluminum layer 42) is externally coated (masked) by a coating member 60 via an O-ring 61, so that sulfuric acid (acid), which is an electrolytic solution 81 used for anodizing, and current As a result, the iron-based component is not melted and melted in the electrolytic solution 81, so that the electrolytic treatment performance is improved. That is, by improving the electrolytic processing performance, the anodic oxide film 50 can be easily and reliably formed, and the life of the electrolytic solution 81 can be extended. Therefore, the life of the product can be extended by forming the anodic oxide film 50. In addition, since the life of the electrolyte 81 is increased, the processing efficiency can be improved, and the amount of the electrolyte 81 used can be reduced, so that the cost can be reduced.

Thus, the electrolytic treatment (anodizing treatment)
The pot body 10 is washed with water (step 10-).
10) After that, while being removed from the beam 70, the covering member 60 is removed from the pot main body 10.
11).

Since many pores are formed in the anodic oxide film formed on the surface of the pot body 10, the pot body 10 from which the covering member has been removed is heated at a high temperature, for example, about 100 ° C. in hot water or steam. A sealing treatment is performed to remove the pores by being exposed for a certain period of time, and an anodic oxide film 50 (alumite) is finally formed on the aluminum surface other than the covering member 60 of the pot body 10 (Step 10-12, (See FIG. 9). In addition,
This sealing treatment may be performed in a step before the removal of the frame and the removal of the masking (see a step indicated by a two-dot chain line in FIG. 10).

The covering member 60 is covered (masked).
Unframed and unmasked process (Step 10-11) from the framed process (Step 10-3) of the finished pot body 10
The above steps are continuously performed by moving the beam 70 on the line.

In the above embodiment, the case where the electromagnetic cooker container is a pressure cooker has been described. However, in the case of a container other than a pan, such as a frying pan or a rice cooker, similarly, other than the covering member 60 joined to the bottom portion. The anodized film 50 (alumite) can be formed on the surface of aluminum of the container body, and the useful life and the product life of these electromagnetic cooker containers can be increased.

[0032]

As described above, according to the present invention, the following effects can be obtained.

(1) According to the first aspect of the present invention, since the anodized film is formed on the aluminum surface of the container body other than the joined iron-based members, the product life of the container can be increased. .

(2) According to the second and third aspects of the present invention, since the iron-based member joined to the container main body is covered from the outside and the iron-based member is not subjected to the anodic oxidation treatment, The iron-based component does not melt under the influence of sulfuric acid (acid), which is the electrolytic solution used, and the current, and does not melt in the electrolytic solution. Therefore, the electrolytic processing performance can be improved, and the life of the electrolytic solution (processing liquid) can be increased, so that the product life and the processing efficiency can be improved. Further, since the amount of the electrolyte used can be reduced, the cost can be reduced.

(3) According to the fourth aspect of the present invention, in the step of externally covering the iron-based member with the covering member,
Surrounding the iron-based member using a covering member surrounding the sealing member that is in close contact with the surface of the container body and the peripheral edge of the iron-based member, and applying a negative pressure to the space between the iron-based member and the covering member with respect to the outside, Then, since the coating member is coated under a negative pressure, the coating of the coating member can be further easily and reliably performed in addition to the above (2), and the formation of the anodic oxide film on the container body can be easily and reliably performed. can do.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a part of a pressure cooker as an example of a container for an electromagnetic cooker according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a part of a pot body which is a container body in the present invention.

FIG. 3 is a plan view (a) showing a cross section of a part of the pot body;
It is the side view (b) of the principal part of arrow I of (a), and the principal part (c) of arrow II.

FIG. 4 is a sectional view of a main part showing a state in which the iron-based member according to the present invention is joined to the pot body.

FIG. 5 is a perspective view showing a main part of the pot main body in a state where the iron-based members are joined.

FIG. 6 is a sectional view (a) showing a state in which the covering member is covered on the pot body in the present invention, and a sectional view (b) showing a state in which the covering member is covered on the pot body.

FIG. 7 is a schematic cross-sectional view showing an electrolytic treatment for subjecting the pot body to an anodizing treatment.

8 is a sectional view taken along the line III-III in FIG.

FIG. 9 is a perspective view showing a main part of the pot body on which the anodized film is formed.

FIG. 10 is a flowchart showing an example of a manufacturing process of a method for manufacturing a container for an electromagnetic cooker according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pot main body (container main body) 11 Bottom part 20 Lid 40 Iron-based member 41 Stainless steel 42 Aluminum layer 50 Anodized film 60 Coating member 61 O-ring (seal member) 62 Ball valve 66 Vacuum pump 70 Feeding part 80 Electrolyzer 81 Electrolyte 82 Counter electrode

Continued on the front page F term (reference) 3K051 AD38 CD44 4B055 AA09 BA14 FA02 FB02 FB04 FB15 FC12 FD03 FE10 4F100 AA19C AA19D AB02B AB04 AB10A AB11H AB18H AK33 BA03 BA04 BA06 BA07 BA10B BA10C BA10D DA01E05 DC21

Claims (4)

[Claims] 1. An electromagnetic cooker container in which an iron-based member is joined to an outer bottom surface of an aluminum container body, wherein an anodized film is formed on a surface of aluminum other than the iron-based member in the container body. A container for an electromagnetic cooker made of aluminum, characterized in that: 2. After joining an iron-based member to the outer bottom surface of the aluminum container body, anodizing the aluminum surface other than the iron-based member with the iron-based member covered from the outside. A method for manufacturing an aluminum electromagnetic cooker container, comprising forming an anodized film. 3. A step of joining an iron-based member to an outer bottom surface of an aluminum container body, a step of covering the iron-based member from outside with a covering member, and the step of covering the covering member with the covering member. A step of forming an anodized film by subjecting an aluminum surface of the container body to anodizing treatment, the method comprising: 4. The method for manufacturing an aluminum electromagnetic cooker container according to claim 3, wherein the step of coating the iron-based member from the outside with a coating member includes the step of covering the surface of the container body and the peripheral edge of the iron-based member. The iron-based member is surrounded by a covering member surrounding the close seal member, and the space between the iron-based member and the covering member is negatively pressured with respect to the outside. A method for producing an aluminum electromagnetic cooker container, comprising: