JP3116675U - Metal plate disposed at the bottom of a cooking container and a cooking container provided with the metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal plate disposed in close contact with the bottom of a cooking container.
A metal plate 40 disposed at the bottom of a cooking container, the metal plate 40 including a locking portion embedded in the outer surface of the bottom of the cooking container, the locking portion being a metal plate. The cylindrical projecting portion 42 surrounds the hole 41 penetrating 40 and projects toward the bottom of the cooking container. The projecting portion 42 is formed to be 3.0 times or less the thickness dimension of the metal plate 40. Moreover, the protrusion part 42 is made into the state which bite diagonally so that it might be hold | suppressed with the metal structure of the bottom part of a cooking container, and the angle is 30 degrees or more and 60 degrees or less in the center part of the bottom part of a cooking container, and a peripheral part. In this case, it is set to 60 degrees or more and 85 degrees or less.
[Selection] Figure 2

Description

  The present invention relates to a metal plate disposed at the bottom of a cooking container, a cooking container provided with the metal plate, and a method of manufacturing the cooking container, and in particular, the metal plate from the bottom of the cooking container. The present invention relates to a metal plate disposed at the bottom of a cooking container and a cooking container provided with the metal plate, which can obtain excellent appearance merchandise without the occurrence of lifting, deformation, dropout, and the like.

  A cooking container used in an electromagnetic cooker is generally formed of a magnetic metal such as iron or stainless steel.

  Aluminum is suitable as a material for cooking containers because it is lightweight, has good thermal conductivity, and is easy to process, but it is a non-magnetic metal, so it should be used in an electromagnetic cooker if it is made of only aluminum. I couldn't.

For this reason, the outside of the cooking container made of aluminum is covered with magnetic metal stainless steel so that it can be used in an electromagnetic cooker, or a magnetic metal plate is provided on the bottom outer surface of the cooking container made of aluminum. A technique has been proposed that can be arranged and used in an electromagnetic cooker (for example, see Patent Document 1).
Japanese Patent No. 3356944 (2nd page)

  However, when the outside of the cooking container made of aluminum is coated with stainless steel, the weight increases by the amount covered with stainless steel, and the light weight characteristic of aluminum cannot be utilized.

  Further, in the configuration of Patent Document 1, the base portion of the rising portion has a rounded shape, and the magnetic metal plate is driven in while deforming the rounded portion, so that it is provided adjacent to the root portion. In some cases, the sizes of the holes are uneven.

  Furthermore, in Patent Document 1, when the magnetic metal plate is driven into the bottom of the cooking container, the corner portion of the rising portion of the magnetic metal plate is deformed, and from this state, the rising portion of the cooking container is flat. It is configured to be driven into the bottom.

  For this reason, excessive deformation will occur in the rising part itself or the bottom part of the cooking container into which the rising part is driven, and the magnetic metal plate and the bottom part of the cooking container are in close contact with each other precisely and uniformly. There is a problem that it is difficult to obtain a bonded state.

  Further, since there is a residual stress due to the deformation, there is a risk that the coupling state between the magnetic metal plate and the bottom of the cooking container may be loosened, or deformation or damage may occur in the process of using the cooking container.

  Furthermore, since the air between the magnetic metal plate and the bottom of the cooking container is only discharged from the flower-shaped opening, air still remains between the magnetic metal plate and the bottom of the cooking container. In this state, the press-fitting of the rising portion of the magnetic metal plate may be completed. In this case, there is a problem that the residual air interferes with the connection between the magnetic metal plate and the bottom of the cooking container, and a complete tight connection between the two cannot be obtained.

  An object of the present invention is to solve the above-described conventional problems and provide a metal plate that is disposed in close contact with the bottom of a cooking container. Another object of the present invention is to provide a cooking container provided with the metal plate.

  According to the metal plate of the present invention, the above-described problem is a metal plate disposed at the bottom of a cooking container, and the metal plate includes a locking portion embedded in the outer surface of the bottom of the cooking container. The locking portion includes a cylindrical protruding portion that surrounds a hole penetrating the metal plate and protrudes toward the bottom of the cooking container, and the protruding portion is 3.0 times the thickness of the metal plate. And the tip of the inner surface of the protruding portion is formed in an inclined surface shape that expands outward, and when the inner surface of the protruding portion is pressed into and embedded in the outer surface of the bottom portion, The angle formed by the peripheral surface and the horizontal surface of the metal plate is 30 degrees or more and 60 degrees or less at the center of the bottom of the cooking container, and 60 degrees or more and 85 degrees at the peripheral edge of the bottom of the cooking container. It is solved by doing the following.

  As described above, according to the metal plate of the present invention, the cylindrical protrusion is provided as the engaging portion embedded in the bottom outer surface of the cooking container, and this protrusion is the thickness dimension of the magnetic metal plate. Since it is formed to be 0 times or less, the engaging portion sufficiently enters the bottom outer surface of the cooking container, and can be firmly fixed to the cooking container. In addition, the tip of the protrusion is sharpened at the tip of the inner surface of the protrusion, that is, the inner surface on the end side of the protrusion is widened outward, and the bottom of the cooking container It is easy to press fit into.

  Moreover, when the metal plate of the present invention is press-fitted and embedded in the bottom outer surface of the cooking container, the metal plate is bitten obliquely so that the protruding portion is pressed down by the metal structure of the bottom of the cooking container. In the present invention, the angle is 30 degrees or more and 60 degrees or less in the central portion of the bottom of the cooking container, and 60 degrees or more and 85 degrees or less in the peripheral portion. And by this structure, a metal plate and the bottom part of the container for cooking can be couple | bonded firmly.

Moreover, since the said protrusion part is embed | buried by press-fitting in the bottom part outer surface of the said container for cooking, it can fix to the bottom part of the container for cooking with a cold press etc.
A corner is formed between the protrusion and the horizontal surface of the metal plate. For this reason, in the process of press-fitting the metal plate into the bottom of the cooking container, the protrusion is bent at the corner.

  Thus, since a protrusion part bends and is embedded in the bottom part outer surface of a cooking container, a metal plate is reliably fixed to a pan bottom. Further, since the protruding portion is bent at the corner portion, the size of the hole surrounded by the protruding portion can be kept uniform. For this reason, the size of the hole appearing in the appearance of the bottom of the cooking container becomes uniform, and it becomes possible to obtain a cooking container more suitable for design.

  More specifically, the root portion on the hole side of the protrusion is formed in a round shape having a radius of curvature of 1.5 times or less the thickness of the metal plate.

  The cooking container of the present invention is a cooking container having a metal plate at the bottom, and the metal plate includes a locking portion embedded in the bottom outer surface of the cooking container, and the locking portion Consists of a cylindrical protrusion that surrounds the hole penetrating the metal plate and protrudes toward the bottom of the cooking container, and the protrusion is formed to be 3.0 times or less the thickness dimension of the metal plate, In addition, the tip of the inner side surface of the protruding portion is formed in an inclined surface shape that expands outward, and the angle formed between the inner peripheral surface of the protruding portion and the horizontal surface of the metal plate is the cooking container. The bottom portion of the cooking container is pressed into the outer surface of the bottom portion so as to be 30 degrees or more and 60 degrees or less and at the peripheral edge portion of the bottom portion of the cooking container to be 60 degrees or more and 85 degrees or less. It is characterized by that. Moreover, the said protrusion part is embed | buried under the said bottom part outer surface in the bent state. Thereby, a protrusion part bites into the bottom part diagonally, and is locked, and a metal plate is fixed to a bottom part more firmly.

  As described above, according to the present invention, the metal plate can be firmly fixed to the bottom of the cooking container. At this time, a magnetic metal plate is used as a metal plate and attached to the bottom of a cooking container made of non-magnetic metal such as aluminum, so that even a cooking container made of non-magnetic metal can be used in an electromagnetic cooker. Is possible.

  In addition, since the metal plate of the present invention is firmly coupled to the cooking container, it is possible to obtain an easy-to-use cooking container without dropping or deformation of the metal plate in the process of use.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and various modifications can be made within the scope of the present invention.

  1 to 9 relate to an embodiment of the present invention, FIG. 1 is a plan view of a metal plate, FIG. 2 is a partial cross-sectional view of the metal plate, FIG. 3 is an enlarged view of a main part of FIG. FIG. 5 is an explanatory view showing a forming process of the metal plate and the cooking container in the first press mold apparatus, FIG. 5 is an explanatory view showing a state of the metal plate at the time of forming, and FIG. 6 is a cooking with the metal plate attached. FIG. 7 is an explanatory view showing a molding process of a metal plate and a cooking container in the second press die apparatus, FIG. 8 is a perspective view showing the cooking container, and FIG. It is explanatory drawing which shows the state of the metal plate.

  FIG. 1 is an explanatory view showing a metal plate of the present embodiment. This metal plate is the magnetic metal plate 40 arrange | positioned at the bottom part of an electromagnetic cooker, for example. The magnetic metal plate 40 is made of stainless steel, for example. As stainless steel, ferritic stainless steel such as SUS430 and SUS434, martensitic stainless steel such as SUS410 and SUS420, and the like can be used.

The material of the magnetic metal plate 40 is not limited to stainless steel, and other magnetic materials such as iron or iron alloy, for example, steel plates such as carbon steel, iron steel, and mild steel may be used.
As the material of the magnetic metal plate 40, a steel material having a Curie point or a magnetic transformation point and transforming from ferromagnetic to paramagnetic above that temperature, for example, 37% nickel / stainless steel may be used.
Moreover, when not aiming at using a metal plate for an electromagnetic cooker, you may use platinum, titanium, etc. as a raw material of a metal plate.

  The magnetic metal plate 40 includes a large number of circular holes 41 that vertically penetrate the metal plate, and a cylindrical protrusion 42 that protrudes perpendicularly to one side of the magnetic metal plate 40 so as to surround the holes 41 (see FIG. 2). It has.

  The protrusion 42 is formed to have a length that is three times or less the thickness of the magnetic metal plate 40. By setting the length of the protrusion 42 to be three times or less the thickness of the magnetic metal plate 40, the protrusion 42 is not deformed when the magnetic metal plate 40 is press-fitted into the bottom of the cooking container. And more metal structure and the protrusion which comprise the bottom part of the container for cooking can be made to contact, and it becomes possible to obtain high bond strength.

  In addition, when the protrusion 42 is formed to be shorter than about 1.5 times the thickness of the magnetic metal plate 40, the protrusion 42 is deformed when the protrusion 42 is press-fitted into the bottom of the cooking container. Can be effectively prevented.

  FIG. 3 is an enlarged view of a main part of the magnetic metal plate 40 shown in FIG. As shown in FIG. 3, a corner 46 is formed between the protrusion 42 and the horizontal surface 45 of the magnetic metal plate 40 on the side from which the protrusion 42 protrudes. The corner 46 in this example is a right angle and is formed at a pin angle. The corner portion 46 may be formed at an acute angle or an obtuse angle instead of a right angle.

  Thus, the corner | angular part 46 is formed between the protrusion part 42 and the horizontal surface 45 of the magnetic metal plate 40, and the process which press-fits the magnetic metal plate 40 in the bottom part 31 of the container 30 for cooking (refer FIG. 4). 5), the protruding portion 42 bends at the corner 46, and the magnetic metal plate 40 can be securely fixed to the bottom 31 of the cooking container 30. That is, the protrusion 42 is bent toward the center of the hole 41 with the corner 46 as a boundary, and enters the bottom 31 of the cooking container 30 as shown in FIG. Thereby, the protrusion part 42 plays the role of the anchor which latches the magnetic metal plate 40, and it becomes possible to fix the magnetic metal plate 40 to the bottom part 31 of the cooking container 30 more firmly.

  Further, since the protruding portion 42 bends with the corner 46 as a boundary, the size of the hole 41 does not vary because the size of the hole 41 surrounded by the protruding portion 42 does not vary due to the bending of the protruding portion 42. The sheath shape can be kept uniform. For this reason, the size and shape of the hole 41 appearing on the appearance of the bottom 31 of the cooking container 30 become uniform, and it becomes possible to obtain a cooking container 30 that is more suitable in design.

  The inner side surface on the end side of the projecting portion 42 is formed as an inclined surface 44 that expands outward. In this way, by setting the inner side surface on the end portion side of the protruding portion 42 as the inclined surface 44, the tip end portion of the protruding portion 42 becomes sharp, and press-fitting into the bottom portion 31 of the cooking container 30 becomes easy.

  Further, the peripheral edge 43 of the hole 41 is formed in a round shape having a radius of curvature that is 1.5 times or less the thickness dimension of the magnetic metal plate 40.

  In this example, the hole 41 formed in the magnetic metal plate 40 is circular. However, the present invention is not limited to this, and a plurality of holes such as straight or curved grid holes, rectangles, ellipses, and polygons are provided. It is good also as a composition. Moreover, although the magnetic metal plate 40 of this example is formed from the single plate-shaped body as shown in FIG. 1, it is good also as a structure which consists of a several divided | segmented plate-shaped body.

  The magnetic metal plate 40 of this example is fixed to the bottom 31 of the cooking container 30 made of a nonmagnetic metal such as aluminum or copper. The cooking container 30 refers to a cooking device having a container shape such as a pan, a frying pan, a kettle, a kettle or the like. In this example, the example in which the cooking container 30 is made of a nonmagnetic metal is shown, but a cooking container made of a magnetic metal may be used.

Hereinafter, a method for attaching the magnetic metal plate 40 to the bottom 31 of the cooking container 30 made of nonmagnetic metal will be described.
For attaching a magnetic metal plate 40 on the bottom 31 of the cooking vessel 30, in the present example, the second press die apparatus S ₂ shown in the first press die apparatus S ₁ and 7 shown in FIG. 4 .

First, the magnetic metal plate is attached to the bottom of the cooking container using the _first press mold apparatus S1 shown in FIG. The first press die apparatus S ₁ is composed of a first mold (upper die 10) and the second die (lower die 20).

In the first press die apparatus S _1, seams of the upper mold 10 and the lower mold 20 has a rounded shape. That is, the upper mold 10 is provided with a spherical press-fitting protrusion 11 having a size that covers the entire area of the magnetic metal plate 40 and curving downward. Further, a concave press-fit portion 21 is formed on the upper end surface of the lower mold 20 so as to be rounded downward and aligned with the press-fit protrusion 11.

In the first press die apparatus S _1, disposed a cooking vessel 30 and the magnetic metal plate 40. The cooking container 30 is disposed on the lower mold 20 with the bottom 31 facing upward. The magnetic metal plate 40 is placed at the center of the bottom 31 of the cooking container 30. At this time, it arrange | positions so that the protrusion part 42 may face the bottom part 31 of the container 30 for cooking.

When the cooking container 30 and the magnetic metal plate 40 are disposed between the upper mold 10 and the lower mold 20, the upper mold 10 is moved downward toward the lower mold 20 to clamp the mold.
As described above, since the spherical press-fitting protrusion 11 is formed on the lower end surface of the upper die 10 and the concave press-fitting portion 21 is formed on the upper end surface of the lower die 20, these upper die 10. By pressure-molding the cooking container 30 and the magnetic metal plate 40 between the 10 and the lower mold 20, the cooking container 30 and the magnetic metal plate 40 are bent and formed.

That is, by clamping the mold, first, the central vertex at the lower end of the press-fitting protrusion 11 of the upper mold 10 touches the central part A of the magnetic metal plate 40. When further pressurized, the bottom 31 of the cooking container 30 and the magnetic metal plate 40 are gradually rounded between the press-fitting protrusion 11 and the press-fitting part 21.
In this way, the press-fitting protrusion 11 pressurizes the magnetic metal plate 40 from the central portion A toward the peripheral portion B in order. And in the press shape which has such a curved surface, it is shape | molded while a bigger pressurizing force is applied to the center part A of a curved surface compared with the peripheral part B. FIG.

  As the pressurization proceeds, the protrusion 42 of the magnetic metal plate 40 bites into the bottom 31 of the cooking container 30. At the same time, a part of the metal structure constituting the bottom 31 of the cooking container 30 enters the hole 41 surrounded by the protrusion 42 of the magnetic metal plate 40. In this way, the bottom 31 of the cooking container 30 and the magnetic metal plate 40 are combined in the state shown in FIG.

  In the above process, when the magnetic metal plate 40 is press-fitted into the bottom of the cooking container 30, the air interposed between the bottom 31 of the cooking container 30 and the magnetic metal plate 40 is surely discharged, with high adhesion. The magnetic metal plate 40 can be attached to the bottom 31 of the cooking container 30.

That is, when a part of the metal structure of the bottom 31 of the cooking container 30 enters the hole 41 inside the protruding portion 42 of the magnetic metal plate 40, the magnetic metal plate 40 and the cooking container enter the hole 41. The air between 30 is pushed out of the hole 41 and discharged.
In addition, the bottom 31 of the cooking container 30 and the magnetic metal plate 40 are in close contact with the upper mold 10 and the lower mold 20 while gradually curving from the central part A. The air between 31 and the magnetic metal plate 40 is naturally discharged to the outside.

Furthermore, since the magnetic metal plate 40 of this example has a corner 46 formed between the protruding portion 42 and the horizontal surface 45 of the magnetic metal plate 40, the magnetic metal plate 40 is pressed against the bottom of the cooking container 30. As a result, as shown in FIG. 5, the protruding portion 42 is bent toward the center of the hole 41.
Thereby, the air in the space K surrounded by the adjacent protrusions 42 and the bottom 31 of the cooking container 30 is discharged as the protrusions 42 are bent.

  Thus, after the metal structure of the bottom 31 of the cooking container 30 completely enters the hole 41 and the space K and is crimped between the molds to complete the molding, the hole 41 and the space K are completed. The metal structure of the bottom portion 31 of the cooking container 30 that has entered the inside is molded so as to be in close contact with the hole 41 and the inner peripheral surface of the space K.

  In addition, since the protruding portion 42 is bent, the protruding portion 42 is embedded in the bottom portion 31 of the cooking container 30, so that the protruding portion 42 has a part of the metal structure of the bottom portion 31. In this way, the bottom 31 of the cooking container 30 and the magnetic metal plate 40 are firmly coupled. This will be described with reference to FIG. The angle between the inner peripheral surface of the cylindrical protrusion 42 surrounding the hole 41 formed in the magnetic metal plate 40 and the horizontal surface of the outer peripheral portion of the hole 41 is α in FIG. 9A before the press-fitting process. As shown, it is substantially perpendicular. And the pressurization part 42 is bend | folded to the center direction of the hole 41 by pressurization, and will be in the state which bite into the bottom part 31 of the cooking container 30 diagonally as shown in FIG.9 (B). At this time, it is preferable to press-fit so that the angle β formed by the inner peripheral surface of the protruding portion 42 and the horizontal surface of the outer peripheral portion of the hole 41 is 30 degrees to 60 degrees. When press-fitted so as to form such an angle, the inner peripheral surface of the protruding portion 42 is pressed down by the metal structure of the bottom portion 31 and has a structure having sufficient anchor strength. Accordingly, the bottom 31 and the magnetic metal plate 40 are more firmly coupled and are not easily dropped off.

Thus, in this example, the first press mold apparatus S ₁ is used to form and integrate the bottom 31 of the cooking container 30 and the magnetic metal plate 40 while gradually curving them. Therefore, compared to the conventional configuration in which pressure is instantaneously formed in a flat state, the air between the metal plates can be completely discharged, and the two metal plates are in a uniform contact state with no gaps. Can be combined.

  In practice, as described above, the central portion A and the peripheral portion B of the magnetic metal plate 40 differ in the magnitude of the pressing force during pressing. Accordingly, the angle at which the protrusion 42 is bent varies depending on the magnitude of the applied pressure. That is, the projecting portion 42 is sufficiently bent at the central portion A where the applied pressure is large, but is not bent as much as the central portion at the peripheral portion B. For this reason, even when the angle β is adjusted to be 30 to 60 degrees in the central portion A, the angle β in the peripheral portion B is a value closer to a right angle.

In short, the variation in the angle β is caused by the variation in the pressing force generated by the press die apparatus having a curved surface shape. Then, the angle β was confirmed by cutting the cooking container in which the magnetic metal plate 40 of the prototype was joined by pressing, and as a result, it varied in the range of 30 to 85 degrees from the central part A to the peripheral part B. It was confirmed that the coupling state between the cooking container and the magnetic metal plate 40 was good.
In addition, the said center part A corresponds to the center part of the bottom part of the cooking container of this invention, and the said peripheral part B corresponds to the peripheral part of the bottom part of the cooking container of this invention.

In consideration of moldability and productivity of products, time of molding work caused by the first press die apparatus S ₁ is suitably in the range of about 2 to 5 seconds per product molding.

  Further, as the driving means for the upper mold 10 and the lower mold 20, it is desirable to adopt a cam driving system rather than a means such as a normal hydraulic driving apparatus or a crank driving apparatus.

  On the other hand, the degree of bending of the bottom 31 of the cooking container 30 and the magnetic metal plate 40 by the press-fitting protrusion 11 of the upper die 10 and the press-fitting portion 21 of the lower die 20 is the depth of maximum bending of the formed metal plate. However, it is desirable that the thickness is within a range of 4 times the thickness of the magnetic metal plate 40.

Thus, if the bottom part 31 of the cooking container 30 and the magnetic metal plate 40 are couple | bonded, the shape of the bottom part 31 of the cooking container 30 will be made flat using _2nd press die apparatus S2.

The second press die apparatus S _2, as shown in FIG. 7, the joint between the third mold (upper die 50) and the fourth mold (lower mold 60) is horizontal. And the bottom part 31 of the cooking container 30 to which the magnetic metal plate 40 is attached is disposed between the upper mold 50 and the lower mold 60, and the bottom part of the cooking container 30 is clamped and pressurized. The shape of 31 is formed flat.

  Then, the washing | cleaning process which wash | cleans the cooking container 30 with which the magnetic metal plate 40 was embedded through the said process, an outer surface enamel finishing process, an inner surface processing process, and a bottom finishing process are performed, and manufacture of the cooking container which concerns on this embodiment Complete the method. Further, curling, necking, drilling, polishing, surface treatment with a fluororesin, or the like may be performed.

It is a top view of the metal plate which concerns on this invention. It is a fragmentary sectional view of a metal plate. FIG. 3 is an enlarged view of a main part of FIG. 2. It is explanatory drawing which shows the formation process of the metal plate and cooking container in a 1st press die apparatus. It is explanatory drawing which shows the state of the metal plate at the time of shaping | molding. It is a fragmentary sectional view of the cooking container bottom part to which the metal plate was attached. It is explanatory drawing which shows the formation process of the metal plate and cooking container in a 2nd press die apparatus. It is a perspective view which shows the container for cooking which concerns on this invention. It is explanatory drawing which shows the state of the metal plate at the time of shaping | molding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,50 Upper mold | type 20,60 Lower mold | type 30 Cooking container 31 Bottom part 40 Magnetic metal plate 41 Hole 42 Protrusion part 43 Peripheral part 44 Hole inclined surface 45 Horizontal surface A Central part B Peripheral part K Space S ₁ 1st press metal Mold device S ₂ 2nd press mold device

Claims (5)

A metal plate disposed at the bottom of the cooking container,
The metal plate is provided with a locking portion embedded in the bottom outer surface of the cooking container,
The locking portion comprises a cylindrical protruding portion that surrounds a hole penetrating the metal plate and protrudes toward the bottom of the cooking container,
The projecting portion is formed to be 3.0 times or less the thickness dimension of the metal plate, and is formed in an inclined surface shape in which the front end portion of the inner surface of the projecting portion expands outward, and the bottom outer surface. And the angle formed by the inner peripheral surface of the protruding portion and the horizontal surface of the metal plate is 30 degrees or more and 60 degrees or less at the center of the bottom of the cooking container, and A metal plate disposed on a bottom portion of the cooking container, wherein the peripheral edge portion of the bottom portion of the cooking container is set to 60 degrees or more and 85 degrees or less.   The metal plate disposed at the bottom of the cooking container according to claim 1, wherein a corner is formed between the protruding portion and a horizontal surface of the metal plate.   The peripheral portion of the hole is formed in a round shape having a radius of curvature of 1.5 times or less the thickness of the metal plate, and is disposed at the bottom of the cooking container according to claim 1. Metal plate. A cooking container with a metal plate at the bottom,
The metal plate includes a locking portion embedded in the bottom outer surface of the cooking container,
The locking portion comprises a cylindrical protruding portion that surrounds a hole penetrating the metal plate and protrudes toward the bottom of the cooking container,
The protruding portion is formed to be 3.0 times or less the thickness dimension of the metal plate, and is formed in an inclined surface shape in which a tip portion of the inner side surface of the protruding portion expands outward, and the protruding portion The angle formed by the inner peripheral surface of the metal plate and the horizontal surface of the metal plate is 30 degrees or more and 60 degrees or less in the central portion of the bottom portion of the cooking container, and 60 degrees or more in the peripheral portion of the bottom portion of the cooking container. A cooking container, which is press-fitted and embedded in the bottom outer surface so as to be 85 degrees or less.   The cooking container according to claim 4, wherein the protruding portion is embedded in the outer surface of the bottom portion in a bent state.

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