JPH08196421A - Cookpot for electromagnetic cooking - Google Patents

Abstract

PURPOSE: To obtain an insert excellent in durability without being easily peeled off, by casting to wrap the insert having a wire gauze joined by sintering to the surface of a flate plate magnetic substance, when producing a cookpot for electromagnetic cooking by casting the insert of the magnetic substance into an aluminium alloy. CONSTITUTION: When producing a cookpot 1 for electromagnetic cooking, a vertically movable punch is made to stand by on the upper portion of a metal mold having a cooling function in a molten metal forging apparatus. In this state, an insert 2 of a magnetic substance composed of a stainless flat plate 5 and a steel wire gauze 6 is placed on the inner bottom portion of the metal mold, and molten aluminium alloy is poured into it. Then, a punch is lowered and started fitting into the metal mold, and by inserting and pushing the front end of the punch into the molten metal, a cavity is filled with the pushed molten metal. The molten metal, being deprived of heat by the metal mold which is kept cool and by the punch, is solidified into a product shape having a bottom part 3 and a side wall 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electromagnetic cooking pot.

[0002]

2. Description of the Related Art In an aluminum alloy pot used in an electromagnetic cooker, a magnetic material that generates heat by generating eddy currents with magnetic lines of force is sprayed on the outer surface of the bottom, and the heat generated by the magnetic substance at the bottom is converted into aluminum alloy. The ingredients contained in the pot are cooked by heating. However, in recent years, pots made entirely of magnetic materials such as martensitic stainless alloys have been put on the market, and the price has become extremely high. However, this stainless alloy ladle is considerably inferior to the aluminum alloy in terms of heat transfer to foodstuffs due to the thinness of the material and its manufacturing method because it is thin due to the pressing process.

A pot made of a material obtained by laminating a metal such as copper or aluminum on the inner surface by the clad manufacturing method is not inferior in heat transfer, but is expensive because the process is complicated. Also, it is well known that a pan in which a steel thin plate is cast on the outer surface of the bottom of the pan is well known, but eddy currents are generated on the surface due to the principle of eddy current heat generation due to electromagnetic induction. There was a problem that it gradually deformed and peeled off. Therefore, the applicant of the present application worked on a manufacturing method in which a magnetic material insert is surrounded by gravity casting that can be provided at low cost and pressure casting such as die casting or molten metal forging that can be manufactured in a shorter time, and the back surface of the thin plate is roughened by shot blasting. We have studied methods that do not peel off by making the surface a surface and improving adhesion, or by bonding powder to the back surface of a thin plate and using powder as a medium to improve adhesion, but the former is not sufficient and the latter is not enough. I could not say.

[0004]

Therefore, the problem to be solved by the present invention is to use a thin plate of magnetic material for a long time when it is cast on the outer surface of the bottom of a pan for an electromagnetic cooker made of an aluminum alloy. However, it is to establish an inexpensive and easy method that does not peel off.

[0005]

To this end, an insert of the thin plate in which a wire net is diffusion-bonded to the surface of the thin plate in a high temperature vacuum is inserted into a mold attached to a casting machine, and the wire net is placed in a cavity at a predetermined position. Then, the molten aluminum alloy is poured from the gate and cooled and solidified. Then, after solidification, take out the pot of the product material.

[0006]

The bottom plate of the thus prepared electromagnetic cooking pan is firmly solidly engaged with the bottom part of the aluminum alloy by the aluminum alloy invading and solidifying into the void of the wire mesh, and the wire mesh is kept in a high temperature vacuum before casting. Since it is diffusion-bonded, the wire nets are firmly connected to each other and do not easily separate from the bottom of the aluminum alloy. Further, since the insert is the above-mentioned method, it can be manufactured at low cost. Furthermore, since the wire net penetrates deeply into the bottom of the aluminum alloy to increase the surface area, the amount of heat generated by the thin plate can be transmitted to foodstuffs more quickly in terms of heat transfer efficiency, and the side wall of the pan is also thick. Since it is a casting, it has excellent heat transfer capability and can be used in a wide variety of cooking methods.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. First, FIG. 1 is a sectional view of a pan 1 for electromagnetic cooking.
Is an insert of a magnetic material cast in the bottom 3 made of an aluminum alloy material, and 4 is a side wall made of an aluminum alloy material. FIG. 2A is a plan view of the insert 2,
FIG. 2B is a cross-sectional view taken along the line AA ′ of FIG. 2A, in which the insert 2 is made of stainless steel flat plate 5 and steel wire mesh 6 in a vacuum container under pressure at 1300 to 1500 ° C. by diffusion bonding. Being manufactured. FIG. 3 is an enlarged view of the right half of FIG. 1, showing that the food material 7 and the hot water 8 are contained in the pan 1.

FIG. 4 is a cross-sectional view of a molten metal forging device for manufacturing the electromagnetic cooking pot 1, which is used for electromagnetic cooking when a vertically movable punch 10 is lowered and fitted into a mold 9 having a cooling function (not shown). The punch 10 stands by at the top so that a cavity 11 having substantially the same shape as the pot 1 is formed, and an insert 2 composed of a flat plate 5 made of stainless steel and a metal wire net 6 made of steel is placed on the bottom of the cavity 11 and the cavity 11 is formed. It is shown that a molten metal 13 of 720 ° C. was poured into the bottom of 11 by a ladle 12. FIG. 5 shows the molten metal 13 in which the punch 10 descends from the state of FIG. 4 and is horizontally stretched by gravity.
It shows that the contact pressure is on.

The manufacturing method will be described with reference to the above drawings.
The insert 2 is placed on the bottom of the mold 9, and the molten metal 13 of 720 ° C. aluminum alloy 13 is put into the cavity 1 by the ladle 12.
Immediately after pouring into the bottom of the punch 1, the punch 8 descends and starts fitting, the tip of the punch 10 plunges into and presses against the molten metal 13, and the cavity 13 is filled with the molten metal 13 that has been pushed, and the molten metal 13 is kept cooled. The mold 9 and the punch 10 deprive the calorie of the product and have a product shape and solidify. At this time, the insert 2 may be preheated to the same degree as the mold 9. Then, after solidification is completed, the cast product is extruded by a not-shown protruding pin, and the product material is completed.

After heating the pot thus manufactured to 300 ° C., tap water is sprinkled from the outer surface of the bottom to cool it.
It was repeated 0 times, but no peeling phenomenon was visible. It goes without saying that the materials of the thin plate and the wire mesh are not limited to this as long as they are magnetic materials.

[0011]

INDUSTRIAL APPLICABILITY As described above, the insert of the electromagnetic cooking pot formed by casting and casting the insert in which the wire net is joined to the thin plate of the magnetic material is not easily peeled off, and a product having excellent durability can be manufactured at low cost.

[Brief description of drawings]

[Figure 1] Cross-sectional view of a pan for electromagnetic cooking

FIG. 2 (a) Plan view of insert

FIG. 2B is a sectional view of FIG.

FIG. 3 is an enlarged view of the right half of FIG.

FIG. 4 is a cross-sectional view of a pressure casting device when molten metal is poured into a mold.

FIG. 5 is a sectional view of the pressure casting apparatus immediately before the molten metal is filled in the cavity.

[Explanation of symbols]

 1 Electromagnetic Cooking Pan 2 Insert 3 Bottom of Pan 4 Side Wall of Pan 5 Stainless Steel Flat Plate 6 Steel Wire Mesh 7 Food Material 8 Hot Water 10 Punch 11 Cavity 12 Ladle 13 Molten Metal

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[Procedure amendment]

[Submission date] June 27, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

[Figure 1] Cross-sectional view of a pan for electromagnetic cooking

2 (a) is a plan view of an insert, FIG.
2B is a sectional view taken along the line AA ′ of FIG.

FIG. 3 is an enlarged view of the right half of FIG.

FIG. 4 is a cross-sectional view of a pressure casting device when molten metal is poured into a mold.

FIG. 5 is a sectional view of the pressure casting apparatus immediately before the molten metal is filled in the cavity.

[Explanation of Codes] 1 Induction Cooking Pan 2 Insert 3 Bottom of Pan 4 Side Wall of Pan 5 Stainless Steel Flat Plate 6 Steel Wire Mesh 7 Food Material 8 Hot Water 9 Mold 10 Punch 11 Cavity 12 Ladle 13 Molten Metal

Claims (1)

[Claims] 1. A method for producing a magnetic induction pan by casting a magnetic material insert into an aluminum alloy by a casting method, wherein an insert in which a wire mesh is sinter-bonded to the surface of a flat magnetic material is used. A method for producing an electromagnetic cooking pot, characterized in that the pot is cast in the impregnating direction.