JP2003079509A - Cooking utensil and method of manufacturing for cooking utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooking utensil with superior productivity suitably used in an electromagnetic cooker. SOLUTION: The cooking utensil 1 is provided with a cooking utensil body 2 cast from aluminum or an aluminum alloy, and a metal plate 4 comprising a magnetic body inserted in a bottom 3 of the cooking utensil body 2 in casting. The metal plate 4 has a plurality of engaging hole parts 5 and 5 engaging with the bottom 3 of the cooking utensil body 2, and its one face 4a side is exposed to an outer face 3a side of the bottom 3 of the cooking utensil body 2. A one face 4a of the metal plate 4 and outer faces 3a of the bottom 3 of the cooking utensil body 2 formed so they are exposed through each engaging hole parts 5 and 5 of the metal plate 4 are flush and continuous with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a cooking tool suitably used for an electromagnetic cooker and a method for manufacturing the cooking tool.

[0002]

2. Description of the Related Art Cooking utensils such as electromagnetic cooking pots, which are conventionally used for cooking with an electromagnetic cooker, have excellent heat conductivity, are lightweight, and do not rust. The ingredient body was made of aluminum or an aluminum alloy (hereinafter, aluminum). Then, a metal plate made of a magnetic material, for example, a metal plate made of stainless steel, which is formed so as to fit snugly into a recess provided in the bottom, is fitted. However, when the cooker is heated by the electromagnetic cooker, the aluminum thermally expands, and the metal plate fitted in the bottom of the cooker body may come off. Therefore, for example, FIG. 17 and FIG.
A cooking utensil 11 as shown in 8 has been proposed. In this, the metal plate 14 made of a magnetic material is inserted into the bottom portion 13 of the cooking utensil body 12 made of aluminum so that the metal plate 14 does not come off. The cooking utensil 11 was provided with the groove 15 that divides the outer surface 13a of the bottom portion 13 of the cooking utensil body 12 from the convex portion 14a formed on the metal plate 14. That is, the groove 15 is formed on the outer surface 1 of the bottom portion 13 of the cooking utensil body 12.
3a, the convex portion 14 formed on the metal plate 14 exposed
The metal plate 14 is formed on both sides of a and a part of the metal plate 14 is exposed at the bottom surface 15a. By exposing the metal plate 14 from the outer surface 13a of the bottom portion 13 of the cooking utensil body 12 in this manner, the cooking utensil can be used for cooking with an electromagnetic cooker.

[0003]

However, in the conventional cooking utensil 11, the aluminum cooking utensil main body 12 is
When cast to insert the metal plate 14,
A mold G on which the metal plate 14 is placed, and the metal plate 14
There was a case where aluminum invaded from a slight gap partially formed between and, and after the mold was removed, a part of the metal plate 14 which became the bottom surface 15a of the groove 15 was covered with the aluminum thin film. However, this aluminum thin film cannot be easily scraped off by a cutting machine or the like, and it has to be peeled off by hand manually along the groove 15, which is very troublesome and the productivity is poor.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a cooking utensil excellent in productivity and a method of manufacturing the cooking utensil.

Another object of the present invention is to provide a cooking utensil having excellent integration with a cooking utensil body and a metal plate made of a magnetic material, which is inserted into the cooking utensil body, and to manufacture the cooking utensil. To provide a method.

Still another object of the present invention is to provide a cooking utensil with high heating efficiency and a method for manufacturing the cooking utensil.

Still another object of the present invention is to provide a cooking utensil in which the bottom portion of the cooking utensil body is less deformed, and a method of manufacturing the cooking utensil.

[0008]

A cooking tool according to the present invention,
And the manufacturing method of the cooking tool consists of the following structures in order to achieve the said objective. That is, the cooking utensil according to the invention according to claim 1 is a cooking utensil body cast from aluminum or an aluminum alloy (hereinafter, aluminum), and is inserted into the bottom of the cooking utensil body during the casting. A metal plate made of a magnetic material. Then, the metal plate engages with the bottom portion of the cooking utensil body,
It has a plurality of engaging hole portions, and one surface side thereof is exposed to the outer surface side of the bottom portion of the cooking utensil body, and is exposed so as to pass through one surface of the metal plate and each engaging hole portion of the metal plate. The outer surface of the bottom of the cooking utensil main body is flush and continuous. According to this, even when one side of the metal plate is covered with an aluminum thin film when the cooking utensil body is cast by inserting the metal plate, the aluminum thin film is By cutting the outer surface of the bottom of the cooking utensil body with a cutting machine or the like together with one surface,
It is scraped off.

Further, in the cooking utensil according to a second aspect of the invention, the engaging hole portion is a concave protrusion that is recessed from one surface side of the metal plate and protrudes toward the other surface side, and the concave portion thereof. It is preferable that the shaped protrusion has an opening that opens in a direction orthogonal to the thickness direction of the metal plate. As a result, when the cooking utensil body and the metal plate are integrally molded, the molten aluminum flows into the concave protrusion through the opening of the engagement hole. Then, the concave protrusion is sandwiched by the melted aluminum that has flowed inward and the melted aluminum that surrounds the concave protrusion on the outer side thereof, so that the concave protrusion is inside the bottom of the cooking utensil body. Buried. Therefore, the engagement hole portion is firmly fixed to the bottom portion of the cooking utensil body.

Further, in the cooking utensil according to a third aspect of the present invention, in some or all of the plurality of engaging hole portions, the openings are in a direction orthogonal to the thickness direction of the metal plate. ,
Further, it is preferable that the opening is formed in the circumferential direction centered on the center of the bottom of the cooking utensil body, and that the concave protrusion extends in the direction toward the center of the bottom of the cooking utensil body. There is an electromagnetic cooker in which this cooking utensil is used, in which a heating coil is arranged under the top plate, for example, in a spiral shape. In such an electromagnetic cooker, the cooking utensil is placed such that the center of the bottom of the cooking utensil body is located directly above the center of the spirally wound heating coil, and an alternating current is applied to the heating coil. When flowing, magnetic lines of force are generated around the heating coil.
At this time, the direction of the magnetic lines of force is a direction substantially along the crossing direction of the concave protrusion that extends in the direction toward the center of the bottom of the cooking utensil body, so that the metal plate is inserted through the concave protrusion. It is possible to efficiently pass the magnetic field lines to the.

According to a fourth aspect of the present invention, there is provided a penetrating member, which penetrates the metal plate in the thickness direction thereof and which is arranged at a central position of the bottom of the cooking utensil body. It is desirable that a section is provided. When the cooking utensil body is cast by inserting the metal plate, the molten aluminum flows into the penetrating portion of the metal plate, and the central position of the bottom of the cooking utensil body is composed of only the aluminum of the cooking utensil body. Therefore, when heated, it is possible to suppress deformation due to thermal expansion of the center of the bottom of the cooking utensil body. Further, in an electromagnetic cooker in which this cooking utensil is used, for example, a heating coil is arranged under the top plate so as to be spirally wound, and the center of the spirally wound heating coil is arranged. There is something like having a space for installing a temperature sensor. In this case, even if an alternating current is passed through the heating coil, the magnetic lines of force are weak or do not reach near the center of the space. Even if it is composed of only the cookware body, it does not affect the heating performance of the cookware so much.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a cooking utensil, wherein the cooking utensil body is cast by inserting the metal plate, and the cooking plate body is cast along with one surface of the metal plate. By cutting the outer surface of the bottom portion of the cooking utensil body that is exposed and formed so as to pass through each engagement hole portion, one surface of the metal plate and the outer surface of the bottom portion of the cooking utensil body are flush with each other. According to this, along with the one surface of the metal plate,
The outer surface of the bottom of the cooking utensil body, which is exposed so as to pass through the engagement holes of the metal plate, is such that one surface of the metal plate and the outer surface of the bottom of the cooking utensil body are flush with each other. By cutting, even when one surface of the metal plate is covered with an aluminum thin film when casting the cooking utensil body, the aluminum thin film can be scraped off at the same time as the cutting.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a cooking utensil and a method of manufacturing the cooking utensil according to the present invention will be described below with reference to the drawings.

1 to 5 show a cooking utensil according to the present invention,
And 1st embodiment of the manufacturing method of the cooking tool is shown. Reference numeral 1 in the figure is a cooking tool for an electromagnetic cooker, such as a pan for an electromagnetic cooker, which is preferably used for an electromagnetic cooker (not shown), for cooking or frying food. The cooking utensil 1 includes a cooking utensil body 2 cast from aluminum or an aluminum alloy, and a bottom portion 3 of the cooking utensil body 2.
The metal plate 4 made of a magnetic material is inserted during the casting.

The cooking utensil body 2 has a circular shape in plan view,
A step portion 2a on which a lid (not shown) is placed is provided inside the upper portion. In addition, since a protruding portion T having a ring shape in a plan view that protrudes downward is provided at a position near the outer periphery of the bottom portion 3 on the outer surface 3a side, when the cooking utensil 1 is placed on the top plate of the electromagnetic cooker. Moreover, the outer surface 3a of the bottom portion 3 of the cooking utensil body 2 and the upper surface of the top plate of the electromagnetic cooker do not come into contact with each other. The height H of the protrusion T is preferably 1 to 2 mm, but is not limited to this.

The metal plate 4 made of a magnetic material is, for example, ferritic stainless steel (SUS430 or SUS4).
34 etc.) is a metal plate having a circular shape in a plan view. The metal plate 4 has a plurality of engagement holes 5 and 5 which are engaged with the bottom 3 of the cooking utensil body 2 in almost the entire area (in the illustrated embodiment, this is clearly shown in FIG. 4). As described above, the engagement hole portions 5 and 5 arranged in an annular shape are arranged concentrically in a plurality of rows, so that the engagement hole portions 5 and 5 are provided in substantially the entire area of the metal plate 4). . The engagement hole portion 5 is, for example, recessed in a trapezoidal vertical section (it may be recessed in an arc shape or another shape) so as to become narrower as it goes away from the one surface 4a side of the metal plate 4, and on the other surface 4b side. A concave projection 6 having a rectangular shape in plan view and two openings 7, 7 for opening the projection 6 in a direction orthogonal to the thickness direction of the metal plate 4.
With. In the illustrated embodiment, in detail, the engagement hole 5 has openings 7, 7 in a direction orthogonal to the thickness direction of the metal plate 4 and the bottom 3 of the cooking utensil body 2. Is opened in the direction toward the center of the cooking utensil (or the opposite direction), and the concave projection 6 extends in the circumferential direction around the center of the bottom 3 of the cooking utensil body 2. The metal plate 4 is exposed on the outer surface 3a side of the bottom portion 3 of the cooking utensil main body 2 on the one surface 4a side except for the engagement holes 5 and 5, and the one surface 4a of the metal plate 4 is exposed.
And the outer surfaces 3a, 3 of the bottom portion 3 of the cooking utensil body 2 that are exposed and formed so as to pass through the engagement holes 5, 5 of the metal plate 4, respectively.
a and the same surface. Further, the metal plate 4 has an outer peripheral edge portion 4c embedded in the bottom portion 3 of the cooking utensil body 2, and together with the engagement holes 5 and 5, the bottom portion 3 of the cooking utensil body 2 is formed.
Is engaged with.

Next, a method of manufacturing the cooking utensil 1 such as the electromagnetic cooking pan having the above-described structure according to the first embodiment will be described. First, the cooking tool main body 2 is cast by inserting the metal plate 4 made of a magnetic material. That is, when the metal plate 4 made of a magnetic material is placed on a mold (not shown) that can be attracted and fixed by magnetic force, and the molten aluminum is poured into the mold, the molten aluminum is retained in the engaging hole portion 5. It flows into the concave projection 6 through the two openings 7, 7. Thus, when the molten aluminum flows into the concave projection 6, the concave projection 6 surrounds the concave projection 6 on the outside with the molten aluminum flowing inside. It is embedded in the bottom portion 3 of the cooking utensil body 2 so as to be sandwiched by the molten aluminum. Therefore, the engaging hole portion 5 is the bottom portion 3 of the cooking utensil body 2.
It is firmly fixed to. Further, the outer surface 3a of the bottom portion 3 of the cooking utensil body 2 is exposed and formed so as to pass through the engaging hole portion 5 of the metal plate 4, and the outer surface 3a and the one surface 4a of the metal plate 4 are formed. , Continuous in a plane.
However, the molten aluminum may infiltrate through a slight gap partially formed between the mold on which the metal plate 4 is placed and the metal plate 4, and in this case, after demolding,
One surface 4a of the metal plate 4, that is, the periphery of the engagement hole portion 5 is covered with a thin film of aluminum.

In such a case, one surface 4a of the metal plate 4
At the same time, the outer surface 3 of the bottom portion 3 of the cooking utensil body 2 that is exposed and formed so as to pass through the engagement holes 5 and 5 of the metal plate 4
Cut a. By this cutting, one surface 4a of the metal plate 4
The outer surface of the bottom portion 3 of the cooking utensil body 2 is flush with the surface to form a continuous flat surface, and the thin aluminum film covering one side of the metal plate can be cut off at the same time as cutting. (In FIG. 2, the state before cutting is shown by a two-dot chain line). Thereafter, if necessary, the entire outer surface of the cooking utensil 1 including the one surface 4a of the metal plate from which the thin aluminum film has been cut off and the outer surface 3a of the bottom 3 of the cooking utensil body 2 is coated with a heat-resistant paint or the like. . In addition, at the time of casting, one surface 4a of the metal plate 4 is
It is not necessary to cut the outer surface 3a of the bottom portion 3 of the cooking utensil body 2 together with the one surface 4 of the metal plate 4 unless it is covered with a thin film of aluminum.

According to the cooking utensil shown in the first embodiment, when the cooking utensil body 2 is cast, the one surface 4a of the metal plate 4 is formed.
Even when the periphery of the engagement hole on the side is covered with a thin film of aluminum, the thin film of aluminum, together with the one surface 4a of the metal plate 4, cuts the outer surface 3a of the bottom 3 of the cooker body 2 from the cutting machine. It has excellent productivity because it can be cut and scraped off with, etc. Further, even if almost the entire area of the metal plate 4 is exposed to the outer surface 3a side of the bottom portion 3 of the cooking utensil body 2, the engaging holes 5, 5 of the cooking plate body 2 are almost entirely in the entire area. Since it is fixed to the bottom portion 3 and the outer peripheral edge portion 4c of the metal plate 4 is also embedded in the bottom portion 3 of the cooking utensil body 2, it has excellent integrity. Further, in the engaging hole portion 5, the concave protruding portion 6 is the bottom portion 3 of the cooking utensil body 2.
Inside, it is embedded so as to be sandwiched between the aluminum constituting the bottom portion 3 and is firmly fixed to the bottom portion 3 of the cooking utensil body 2, so that the cooking utensil body 2 and the cooking utensil body 2 are inserted. Excellent integration with the metal plate 4 made of a magnetic material. The metal plate 4 is exposed to the outer surface 3a side of the bottom portion 3 of the cooking utensil main body 3 in almost the entire area except the engaging holes 5 and 5, so that the cooking utensil 1 is heated by the electromagnetic cooker. Good thermal efficiency.

Further, according to the method of manufacturing the cooking utensil shown in the first embodiment, the outer surface 3a of the bottom portion 3 of the cooking utensil body 2 as well as the one surface 4a of the metal plate 4 are covered with the one surface 4a of the metal plate 4. And the outer surface 3a of the bottom portion 3 of the cooking utensil body 2 are cut so as to be flush with each other, whereby the one surface 4a of the metal plate 4 is cut.
However, even if it is covered with a thin aluminum film,
Since it can be scraped off at the same time as the cutting, it is excellent in productivity.

It should be noted that the present invention is not limited to the above-described embodiment, but various modifications can be made. For example, the plurality of engaging hole portions 5 and 5 included in the metal plate 4 made of a magnetic material may have the configuration of the second embodiment shown in FIGS. 6 to 10. That is,
In the cooking utensil 1 of the second embodiment, like the cooking utensil 1 of the first embodiment, the engagement hole portions 5 and 5 groups arranged in an annular shape are arranged in a plurality of concentric rows, The engaging hole portion 5,
5 is provided almost all over the metal plate 4. The engagement hole portion 5 is formed so that the hole diameter becomes smaller as the distance from the one surface 4a of the metal plate 4 increases, and the protruding portion 8 with a hole having a circular shape in plan view protrudes to the other surface 4b side. On the tip side of the projecting portion 8 with a hole that projects toward the other surface 4b,
A through hole 9 penetrating in the thickness direction of the metal plate 4 is opened. Then, when the cooking utensil body 2 is cast by inserting the metal plate 4, the aluminum melted from the through hole 9 flows into the projecting portion 8 with a hole. Then, the projecting portion 8 with holes is sandwiched by the molten aluminum that has flowed inward and the molten aluminum that surrounds the projecting portion 8 with holes, so that the bottom portion of the cooking utensil body 2 is It is buried in 3. Therefore, the engagement hole portion 5 is firmly fixed to the bottom portion 3 of the cooking utensil body 2. In this way, the shape and structure of the engagement hole portion 5 can be changed as appropriate and are not limited to a specific shape and structure.

Further, the plurality of engagement holes 5, 5 of the metal plate 4 made of a magnetic material may have the structure of the third embodiment shown in FIGS. 11 to 16.
That is, in the cooking utensil 1 of the third embodiment, as in the first embodiment, the engaging hole portions 5 and 5 groups arranged in an annular shape are concentrically arranged in a plurality of rows, so that Aperture 5,
5 is provided almost all over the metal plate 4. The engagement hole 5 has the same shape as the engagement hole 5 of the cooking utensil 1 of the first embodiment, and is, for example, a concave projection 6 having a rectangular shape in plan view.
And two openings 7, 7. And, a part of the plurality of engaging hole portions 5 and 5 (in the illustrated embodiment, the engaging hole portions 5 and 5 groups are concentrically arranged in four rows, but three rows from the center thereof Up to the engagement hole 5,
5), the two openings 7, 7 are open in the direction orthogonal to the thickness direction of the metal plate 4 and in the circumferential direction centered on the center of the bottom 3 of the cooker body 2, The concave projections 6 extend in the direction toward the center of the bottom portion 3 of the cooking utensil body 2 (which is also the same as the longitudinal direction of the engaging hole portion 5). Further, in the other engaging hole portions 5 and 5 which form the outermost row among the four concentrically arranged rows, the two opening portions 7 and 7 are in a direction orthogonal to the thickness direction of the metal plate 4. In addition, while opening in the direction toward the center of the bottom portion 3 of the cooking utensil body 2 (or in the opposite direction), the concave projection 6 is centered on the center of the bottom portion 3 of the cooking utensil body 2. It runs in the circumferential direction. In addition, the plurality of engaging hole portions 5, 5
Are all the same, that is, the two openings 7, 7 are in the direction orthogonal to the thickness direction of the metal plate 4 and in the circumferential direction centered on the center of the bottom 3 of the cooker body 2. And the concave protrusions 6 may be provided so as to extend in the direction toward the center of the bottom portion 3 of the cooker body 2.

Further, the metal plate 4 is provided with a penetrating portion K penetrating in the thickness direction thereof and arranged at the central position of the bottom portion 3 of the cooking utensil body 2, for example, having a circular shape in plan view.
The size of the penetrating portion K is, for example, 20 mm to 4 mm in diameter.
The range of 0 mm is preferable, but not limited to that value.
Then, by inserting the metal plate 4 and casting the cooking utensil body 2, the penetration portion K is
The melted aluminum flows into the bottom 3 of the cooking utensil body 2.
Since the central position of the cooking utensil main body 2 is composed only of aluminum, it is possible to suppress deformation of the center of the bottom portion 3 of the cooking utensil main body 2 due to thermal expansion when heated.

Further, in the cooking utensil 1 of the first embodiment, a ring-shaped protruding portion T is provided at a position near the outer periphery of the bottom portion 3 on the outer surface 3a side.
As clearly shown in FIG. 16 and FIG. 16, in the cooking utensil 1 shown in the third embodiment, the bottom portion 3 of the cooking utensil main body 2 is used.
Since no such protruding portion T is provided on the outer surface 3a side, the outer surface 3a is flat so that the outer surface 3a of the bottom portion 3 and the upper surface of the top plate P of the electromagnetic cooker are in contact with each other. By thus flattening, when the cooking utensil 1 is placed on the top plate P of the electromagnetic cooker D, the distance between the metal plate 4 of the cooking utensil 1 and the heating coil N arranged under the top plate P. However, the magnetic lines of force J easily pass through the metal plate 4 because the magnetic field lines J are closer to each other than when the protrusion T is provided. As described above, the protrusion T does not necessarily have to be provided on the outer surface 3a side of the bottom portion 3 of the cooking utensil body 2.

Next, the function and effect of the cooking utensil 1 of the third embodiment will be described. In FIG. 16, symbol D is
It is an electromagnetic cooker. This electromagnetic cooker D includes a heating coil N
Are arranged under the top plate P so as to be wound in a spiral shape, for example. The cooking utensil 1 is placed on the electromagnetic cooker D so that the center of the bottom portion 3 of the cooking utensil body 2 is located right above the center of the spirally wound heating coil N. When an alternating current is applied to the magnetic field, a magnetic field line J is generated around the heating coil N. At this time, the direction of the line of magnetic force J is, as shown by the arrow in the figure, substantially parallel to the crossing direction of the concave projection 6 that extends in the direction toward the center of the bottom 3 of the cooking utensil body 2. So
The magnetic force lines J can be efficiently passed through the metal plate 4 made of a magnetic material through the concave protrusions 6. Therefore, the magnetic force lines J can be efficiently passed through the metal plate 4 through the concave projections 6 extending in the direction toward the center of the bottom portion 3 of the cooking utensil main body 2, so that the heating efficiency of the cooking utensil 1 is improved. Can be improved.

The spirally wound heating coil N of the electromagnetic cooker D has a space N1 at its center, and a temperature sensor S is installed in the space N1. Therefore, even when an alternating current is passed through the heating coil N, the magnetic force lines J are weak or do not reach in the vicinity of the center of the space N1. Therefore, the magnetic force lines J do not reach the bottom part 3 of the cooking utensil body 2. Even if the central position is made of only aluminum, the heating performance of the cooking utensil 2 is not so affected. Therefore, by providing the metal plate 4 with the penetrating portion K arranged at the central position of the bottom portion 3 of the cooking utensil body 2, the center of the bottom portion 3 of the cooking utensil body 2 is made of aluminum. It is possible to suppress the deformation of the center of the bottom portion 3 of the cooking utensil body 2 due to thermal expansion without significantly lowering the heating property.

Further, the metal plate 4 made of a magnetic material is not limited to the one made of ferritic stainless steel, but may be a metal plate made of iron, iron alloy or the like.

The shape of the cooking utensil body 2 may be a quadrangular shape, a rectangular shape, an elliptical shape or any other shape than the circular shape in plan view, and the shape of the metal plate 4 is also the same.
The shape may be a quadrangle, a rectangle, an ellipse, or any other shape other than the circular shape in plan view.

The cooking utensil 1 may be a pan with a long handle and a shallow pan bottom for an electromagnetic cooker called a frying pan, which is preferably used for boiling noodles such as spaghetti. May be a deep pot for an electromagnetic cooker, or may be a cooking tool shaped like a clay pot that matches pot dishes, or a hemispherical depression that is suitable for making takoyaki. There is no particular limitation, such as a plurality of cookers for the electromagnetic cooker provided in the upper portion, and other cookers may be used.

[0030]

According to the cooking utensil described in claim 1,
By inserting the metal plate, when casting the cooking utensil body, the periphery of the engagement hole on the one surface side of the metal plate is covered with a thin film of aluminum, even if the thin film of aluminum, With the one surface of the metal plate, the outer surface of the bottom of the cooking utensil main body may be cut off by a cutting machine or the like,
Excellent productivity.

According to the cooking utensil of the second aspect, in addition, since the concave projection of the engaging hole is firmly fixed to the bottom of the cooking utensil main body, The utensil body and the metal plate made of a magnetic material that is inserted into the utensil body are excellent in integration.

According to the cooking utensil of the third aspect, in addition to the above, the electromagnetic cooker is attached to the metal plate via the concave projection extending in the direction toward the center of the bottom of the cooking utensil body. Since the magnetic field lines generated from the heating coil can be efficiently passed, the heating efficiency of the cooking utensil can be improved.

Further, according to the cooking utensil of the fourth aspect, in addition, by providing the metal plate with a penetrating portion arranged at the central position of the bottom of the cooking utensil body, It is possible to suppress deformation of the center of the bottom portion of the cooking utensil body due to thermal expansion without significantly lowering the heating property.

According to the cooking utensil manufacturing method of the present invention, the outer surface of the bottom of the cooking utensil main body together with the one surface of the metal plate is covered with the one surface of the metal plate and the outer surface of the bottom of the cooking utensil main body. By cutting so that and become flush, even when one surface of the metal plate is covered with an aluminum thin film when casting the cooking utensil body, the aluminum thin film can be scraped off at the same time as the cutting. Therefore, it is excellent in productivity.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of a cooking utensil according to the present invention.

FIG. 2 is likewise an enlarged vertical sectional view of an essential part.

FIG. 3 is a bottom view of the same.

FIG. 4 is an enlarged plan view of a metal plate included in the cooking utensil.

5 is an enlarged cross-sectional view taken along the line AA in FIG.

FIG. 6 is a longitudinal sectional view of a second embodiment of a cooking utensil according to the present invention.

FIG. 7 is likewise an enlarged vertical sectional view of an essential part.

FIG. 8 is likewise a bottom view.

FIG. 9 is an enlarged plan view of a metal plate included in the cooking utensil.

10 is an enlarged cross-sectional view taken along the line BB in FIG.

FIG. 11 is a vertical cross-sectional view of a third embodiment of a cooking utensil according to the present invention.

FIG. 12 is likewise an enlarged vertical sectional view of a main part.

FIG. 13 is likewise a bottom view.

FIG. 14 is an enlarged plan view of a metal plate included in the cooking utensil.

15 is an enlarged cross-sectional view taken along the line LL in FIG.

FIG. 16 is a perspective view showing a state where a cooking utensil is placed on the electromagnetic cooker.

FIG. 17 is a bottom view showing a conventional cooking utensil.

18 is an enlarged cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

1 cooking utensil 2 cooking utensils 4 metal plate 3 Bottom of the cooking utensil body 5 Engagement hole 3a bottom outer surface 4a One side of metal plate 4b Other side of metal plate 6 concave protrusion 7 openings K penetration

Claims (5)

[Claims] 1. A cooking utensil comprising: a cooking utensil body cast from aluminum or an aluminum alloy; and a metal plate made of a magnetic material, which is inserted into the bottom of the cooking utensil body at the time of casting. The metal plate has a plurality of engaging hole portions that engage with the bottom portion of the cooking utensil body, and one surface side thereof is exposed to the outer surface side of the bottom portion of the cooking utensil body, and one surface of the metal plate The cooking utensil, which is exposed so as to pass through the engagement holes of the metal plate and is continuous with the outer surface of the bottom of the cooking utensil body, is continuous. 2. The engaging hole portion is a concave protrusion that is recessed from one surface side of the metal plate and protrudes toward the other surface side, and the concave protrusion portion is in a direction orthogonal to the thickness direction of the metal plate. The cooking utensil according to claim 1, further comprising: 3. A part or all of the plurality of engaging hole portions have an opening centered in the direction orthogonal to the thickness direction of the metal plate and at the center of the bottom portion of the cooker body. The cooking utensil according to claim 2, wherein the cooking utensil is opened in the circumferential direction, and the concave protrusion extends in a direction toward the center of the bottom of the cooking utensil body. 4. The metal plate is provided with a penetrating portion which penetrates in the thickness direction thereof and which is arranged at a central position of the bottom portion of the cooking utensil body. The cooking utensil according to any one of 1. 5. The method for manufacturing a cooking utensil according to claim 1, wherein the cooking utensil body is cast by inserting the metal plate, and one surface of the metal plate is inserted. Along with, by cutting the outer surface of the bottom portion of the cooking utensil body that is exposed and formed so as to pass through the engagement holes of the metal plate, one surface of the metal plate and the outer surface of the bottom portion of the cooking utensil body are formed. A method for manufacturing a cooking utensil, the method comprising: