JP2004290661A - Metal plate arranged on bottom part of cooking vessel, cooking vessel with metal plate and production method of cooking vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate metal which is firmly and closely built on the bottom part of a cooking vessel. <P>SOLUTION: A metal plate 40 arranged on the bottom part of the cooking vessel is provided with a retaining part which is imbedded into the external surface of the bottom part of the cooking vessel and the retaining part comprises a cylindrical protruded part 42 sticking out toward the bottom part of the cooking vessel surrounding a hole 41 piercing the metal plate 40 and the protruded part 42 is formed with a dimension less than 3.0 times as much as the thickness dimension of the metal plate 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a metal plate provided at the bottom of a cooking container, a cooking container provided with the metal plate, and a method of manufacturing the cooking container. In particular, the present invention relates to a method of manufacturing the metal plate from the bottom of the cooking container. A metal plate disposed at the bottom of the cooking container, and a cooking container provided with the metal plate, which can obtain excellent appearance and productability without occurrence of lifting, deformation, falling off, etc. The present invention relates to a method for manufacturing a cooking container.

  A cooking container used in an electromagnetic cooker is generally formed from 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.However, because it is a non-magnetic metal, it should be used in an electromagnetic cooker if it is made of aluminum only. Could not.

For this reason, the outside of a cooking container made of aluminum is coated with a stainless steel of a magnetic metal to enable use in an electromagnetic cooker, or a magnetic metal plate is provided on the outer surface of the bottom of the cooking container made of aluminum. There has been proposed a technology in which the device can be disposed and used in an electromagnetic cooker (for example, see Patent Document 1).
Japanese Patent No. 3356944 (page 2)

  However, when the outside of a cooking container made of aluminum is covered with stainless steel, the weight is increased by the amount covered with stainless steel, and the lightweight property of aluminum cannot be utilized.

  In addition, in the configuration of Patent Document 1, the root portion of the rising portion has a round shape, and the magnetic metal plate is driven while deforming the round portion, so that it is provided adjacent to the root portion. In some cases, the size of the holes was irregular.

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

  For this reason, an unreasonable deformation occurs at the rising portion itself or at the bottom of the cooking container into which the rising portion is driven, and the contact region between the magnetic metal plate and the bottom of the cooking container is dense and uniformly adhered. There is a problem that it is difficult to obtain the joined state.

  In addition, due to the residual stress due to the deformation, there is a possibility that the state of connection between the magnetic metal plate and the bottom of the cooking container may be loosened, deformed, or damaged in the process of using the cooking container.

  Furthermore, since 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 such a state, 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 hinders the connection between the magnetic metal plate and the bottom of the cooking container, and a perfect close connection between the two cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a metal plate which is disposed in tight contact with the bottom of a cooking container.
SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic metal plate that is firmly and closely attached to the bottom of a cooking container made of a nonmagnetic metal such as aluminum.

  Another object of the present invention is to provide a cooking container provided with the above-mentioned metal plate and a method of manufacturing the same.

  The object is, according to the metal plate according to claim 1 of the present invention, a metal plate disposed on the bottom of the cooking container, and the metal plate is embedded in the bottom outer surface of the cooking container. A locking portion, wherein the locking portion includes a cylindrical protrusion that surrounds a hole passing through the metal plate and protrudes toward the bottom of the cooking container, and the protrusion has a thickness dimension of the metal plate. Is formed to be 3.0 times or less.

  As described above, according to the metal plate according to the first aspect of the present invention, a cylindrical protrusion is provided as the locking portion embedded in the bottom outer surface of the cooking container, and the protrusion is formed of the magnetic metal plate. Since the thickness is formed to be 3.0 times or less of the thickness dimension, the locking portion can sufficiently enter the bottom outer surface of the cooking container, and can be firmly fixed to the cooking container.

  Further, a corner is formed between the protrusion and the horizontal surface of the metal plate. For this reason, in the step of press-fitting the metal plate into the bottom of the cooking container, the protruding portion is bent around the corner portion.

  As described above, since the protrusion is bent and embedded in the bottom outer surface of the cooking container, the metal plate is securely fixed to the pot bottom. Further, since the protruding portion is bent at the corner, the size of the hole surrounded by the protruding portion can be kept uniform. For this reason, the size of the hole that appears in the appearance of the bottom of the cooking container becomes uniform, and it becomes possible to obtain a cooking container that is more suitable in design.

  To describe a more specific shape, a root portion of the protrusion on the hole side 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 according to claim 4 of the present invention is a cooking container provided with a metal plate on a bottom, wherein the metal plate has a locking portion embedded in an outer surface of a bottom of the cooking container, The locking portion includes a cylindrical protrusion surrounding the hole passing through the metal plate and protruding toward the bottom of the cooking container, and the protrusion has a thickness not more than 3.0 times the thickness of the metal plate. It is formed, and the projection is embedded in the bottom. The protrusion is embedded in the outer surface of the bottom in a bent state, and is securely fixed to the bottom. The projection is embedded in the bottom of the cooking container such that an inner peripheral surface of the projection and a horizontal plane of the metal plate form an angle of 30 degrees or more and 85 degrees or less. As a result, the protruding portion bites obliquely into the bottom and is locked, so that the metal plate is more firmly fixed to the bottom.

  A method for manufacturing a cooking container according to claim 7 of the present invention is a method for manufacturing a cooking container provided with a metal plate on a bottom outer surface, wherein the first die and the second die having a rounded joint are provided. Arranging the bottom of the cooking container and the metal plate so as to overlap the outer surface of the bottom between the first mold and the second mold; and clamping the first mold and the second mold. A step of forming the metal plate and the bottom of the cooking container into a curved shape, and embedding a locking portion protruding from the metal plate into an outer surface of the bottom of the cooking container; Disposing the bottom of the cooking vessel to which the metal plate is joined between the third mold and the fourth mold, and disposing the third mold and the fourth mold in a mold. Tightening and flattening the bottom.

  Further, in the step of clamping the first mold and the second mold and embedding a locking portion projecting from the metal plate into an outer bottom surface of the cooking container, It is preferable that the bottom of the cooking container is press-molded with a curved depth of not more than four times the thickness of the metal plate.

  Thus, according to the method for manufacturing a cooking container of the present invention, in the step of press-fitting the metal plate into the bottom outer surface of the cooking container, the first mold having the concave R-shaped cavity surface, Since pressure molding is performed between the first mold and the second mold facing the first mold, the metal plate and the bottom of the cooking container are joined while being curved.

  That is, since the metal plate and the bottom of the cooking container are gradually curved from the central portion by being clamped between the molds, air between the metal plate and the bottom of the cooking container is exposed to the central side. From the outside, and can be reliably discharged.

  In addition, since the metal plate is bent and the engaging portion of the metal plate is also bent and embedded in the bottom of the cooking container, the locking portion is embedded so as to be hooked inside the layer at the bottom of the cooking container. As a result, the metal plate and the bottom of the cooking container can be firmly connected.

  A step of clamping the third mold and the fourth mold to flatten the bottom, thereby flattening the bottom of the cooking vessel and firmly joining a metal plate to the bottom. Is completed.

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

  In addition, since the metal plate of the present invention is firmly connected to the cooking container, the metal plate does not fall off or deform in the course of use, and a convenient cooking container can be obtained.

  An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, but can be variously modified within the scope of the present invention.

  1 to 9 show an embodiment of the present invention. FIG. 1 is a plan view of a metal plate, FIG. 2 is a partial sectional view of the metal plate, FIG. 3 is an enlarged view of a main part of FIG. Is an explanatory view showing a forming process of a metal plate and a cooking container in the first press die apparatus, FIG. 5 is an explanatory view showing a state of the metal plate at the time of forming, and FIG. FIG. 7 is an explanatory view showing a forming 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 invention. The metal plate is, for example, a magnetic metal plate 40 disposed at the bottom of the electromagnetic cooker. The magnetic metal plate 40 is formed of, for example, stainless steel. 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, but may be a material having another magnetism such as iron or iron alloy, for example, an iron steel plate such as carbon steel, steel, or mild steel.

  Further, 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 its temperature, for example, 37% nickel stainless steel may be used.

  If the metal plate is not intended to be used for the electromagnetic cooker, platinum, titanium or the like may be used as the material of the metal plate.

  The magnetic metal plate 40 includes a large number of circular holes 41 vertically penetrating the metal plate, and a cylindrical protrusion 42 protruding vertically on one surface of the magnetic metal plate 40 so as to surround each of the holes 41.

  The protrusion 42 is formed to have a length of three times or less the thickness of the magnetic metal plate 40. By making the length of the protrusion 42 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 pressed into the bottom of the cooking container. In addition, the metal structure constituting the bottom of the cooking container can be brought into more contact with the protruding portion, and a high bonding force can be obtained.

  In the case where the protrusion 42 is formed to be shorter than about 1.5 times the thickness of the magnetic metal plate 40, when the protrusion 42 is pressed into the bottom of the cooking container, the protrusion 42 deforms. Is more 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 a horizontal surface 45 of the magnetic metal plate 40 on the side where the protrusion 42 protrudes. The corner 46 of this example is a right angle and is formed at a pin angle. The corner 46 may be formed not at a right angle but at an acute angle or an obtuse angle.

  As described above, since the corner 46 is formed between the protrusion 42 and the horizontal surface 45 of the magnetic metal plate 40, in the step of pressing the magnetic metal plate 40 into the bottom 31 of the cooking container 30, the protrusion is formed. 42 bends around the corner 46 so that the magnetic metal plate 40 can be securely fixed to the bottom 31 of the cooking container 30. In other words, the protruding portion 42 is bent toward the center of the hole 41 with the corner 46 as a boundary, and is obliquely cut into the bottom 31 of the cooking container 30. As a result, the protrusion 42 functions as an anchor for locking the magnetic metal plate 40, and the magnetic metal plate 40 can be more firmly fixed to the bottom 31 of the cooking container 30.

  Further, since the protruding portion 42 is bent at the corner portion 46 as a boundary, 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 exterior of the bottom 31 of the cooking container 30 become uniform, and it becomes possible to obtain a cooking container 30 more suitable in design.

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

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

  In this example, the example in which the hole 41 formed in the magnetic metal plate 40 is circular is shown. However, the present invention is not limited to this, and a plurality of holes such as a straight or curved grid hole, a rectangle, an ellipse, and a polygon are provided. It is good also as a configuration. Further, the magnetic metal plate 40 of this example is formed of a single plate as shown in FIG. 1, but may be formed of a plurality of divided plate members.

  The magnetic metal plate 40 of this example is fixed to the bottom 31 of the cooking container 30 made of a non-magnetic metal such as aluminum or copper. In addition, the cooking container 30 refers to cooking equipment in the shape of a container, such as a pot, a frying pan, a kettle, and a kettle. In addition, in this example, the example in which the cooking container 30 is formed from a non-magnetic metal is shown, but the cooking container 30 may be formed from a magnetic metal.

Hereinafter, a method of attaching the magnetic metal plate 40 to the bottom 31 of the cooking container 30 made of a non-magnetic 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, a magnetic metal plate is attached to the bottom of a 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 die 10 is provided with the spherical press-fit projection 11 that has a size that covers the entire area of the magnetic metal plate 40 and that is curved downward and rounded. On the upper end surface of the lower die 20, a concave press-fit portion 21 is formed, which is curved downward and round so as to match 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 such that the bottom 31 faces upward. The magnetic metal plate 40 is placed at the center of the bottom 31 of the cooking container 30. At this time, the protrusion 42 is disposed so as to face the bottom 31 of the cooking container 30.

  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, the press-fit projection 11 having a spherical shape is formed on the lower end surface of the upper mold 10, and the press-fit portion 21 having a concave shape is formed on the upper end surface of the lower mold 20. By pressing the cooking container 30 and the magnetic metal plate 40 between the lower mold 10 and the lower mold 20, the cooking container 30 and the magnetic metal plate 40 are curved and formed.

That is, by clamping the mold, first, the central apex of the lower end of the press-fit projection 11 of the upper mold 10 touches the central part A of the magnetic metal plate 40. When the pressure is further increased, the bottom 31 of the cooking container 30 and the magnetic metal plate 40 are gradually formed into a round shape between the press-fit projection 11 and the press-fit portion 21.
In this way, the press-fitting protrusion 11 presses the magnetic metal plate 40 from the central portion A to the peripheral portion B in order. And in the press shape which has such a curved surface, it shape | molds, applying a bigger press force than the peripheral part B to the center part A of a curved surface.

  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 into the hole 41 surrounded by the protrusion 42 of the magnetic metal plate 40. In this manner, the bottom 31 of the cooking container 30 and the magnetic metal plate 40 are connected as shown in FIG.

  In the above process, when the magnetic metal plate 40 is pressed into the bottom of the cooking container 30, air interposed between the bottom 31 of the cooking container 30 and the magnetic metal plate 40 is reliably discharged, and high adhesion is achieved. 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 protrusion 42 of the magnetic metal plate 40, the magnetic metal plate 40 and the cooking container are inserted into the hole 41. The air between 30 is pushed out of the hole 41 and discharged.

  In addition, since the bottom 31 of the cooking container 30 and the magnetic metal plate 40 are gradually curved from the central portion A and closely contact between the upper die 10 and the lower die 20, the bottom of the cooking container 30. 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 the corners 46 formed between the protrusions 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 projection 42 is bent toward the center of the hole 41.

  Thereby, the air in the space K surrounded by the adjacent protrusion 42 and the bottom 31 of the cooking container 30 is discharged as the protrusion 42 is bent.

  In this way, the metal structure of the bottom portion 31 of the cooking container 30 is completely inserted into the hole 41 and the space K, and is pressed between the molds. The metal structure of the bottom portion 31 of the cooking container 30 that has entered the inside is formed into a state in which the metal structure is in close contact with the hole 41 and the inner peripheral surface of the space K.

  Moreover, since the protrusion 42 is embedded in the bottom 31 of the cooking container 30 while being bent, the protrusion 42 holds a part of the metal structure of the bottom 31. Thus, the bottom 31 of the cooking container 30 and the magnetic metal plate 40 are firmly connected. This will be described with reference to FIG. Before the press-fitting step, 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 represented by α in FIG. As shown, they are approximately right angles. Then, by pressurization, the protruding portion 42 is bent toward the center of the hole 41, and as shown in FIG. 9B, enters the bottom 31 of the cooking container 30 obliquely. At this time, it is preferable to press-fit such that the angle β between 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 at such an angle, the inner peripheral surface of the protrusion 42 is pressed by the metal structure of the bottom 31, resulting in a structure having sufficient anchor strength. Therefore, the bottom portion 31 and the magnetic metal plate 40 are more firmly connected to each other, and are hardly dropped.

As described above, in the present example, the bottom portion 31 of the cooking container 30 and the magnetic metal plate 40 are formed while being gradually curved by using the _first press die device S1, and are integrated. The air between the metal plates can be completely exhausted, and both metal plates can be in a uniform contact state without any gap, compared to the conventional configuration in which pressure molding is performed instantaneously in a flat state. Can be combined.
In fact, as described above, the central portion A and the peripheral portion B of the magnetic metal plate 40 have different pressing forces at the time of pressing. Therefore, the angle at which the protrusion 41 is bent varies depending on the magnitude of the pressing force. That is, the protruding portion 41 is sufficiently bent at the central portion A where the pressing force is large, but is not bent as much at the peripheral portion B as the central portion. Therefore, 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 caused by the press mold device having the curved surface shape. As a result of cutting the cooking container in which the magnetic metal plate 40 of the prototype was joined by pressing and confirming the angle β, the angle varied from 30 degrees to 85 degrees from the central part A to the peripheral part B. It was confirmed that the connection state between the cooking container and the magnetic metal plate 40 was good.

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, it is desirable to employ a cam drive system as a drive unit of the upper die 10 and the lower die 20 rather than a unit such as a normal hydraulic drive device or a crank drive device.

  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 protruding portion 11 of the upper mold 10 and the press-fitting portion 21 of the lower mold 20 is determined by the maximum bending depth of the formed metal plate. However, it is desirable that the thickness be within a range of four times the thickness of the magnetic metal plate 40.

After the bottom portion 31 of the cooking container 30 and the magnetic metal plate 40 are connected in this manner, the shape of the bottom portion 31 of the cooking container 30 is flattened by using the _second press mold device 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. Then, the bottom 31 of the cooking container 30 to which the magnetic metal plate 40 is attached is disposed between the upper die 50 and the lower die 60, and the mold is clamped and pressurized, thereby forming the bottom of the cooking container 30. The shape of 31 is flattened.

  Thereafter, a washing step of washing the cooking container 30 in which the magnetic metal plate 40 is embedded through the above steps, an outer enamel finishing step, an inner surface processing step, and a bottom finishing step are performed to manufacture the cooking container according to the present embodiment. Complete the method. Further, curling, necking, drilling, polishing, surface processing with a fluororesin, or the like may be performed.

It is a top view of the metal plate of the present 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 shaping | molding process of the metal plate and the 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 bottom of the cooking container to which the metal plate was attached. It is explanatory drawing which shows the shaping | molding process of the metal plate and the container for cooking in a 2nd press die apparatus. It is a perspective view showing the cooking container concerning the present invention. It is explanatory drawing which shows the state of the metal plate at the time of shaping | molding.

Explanation of reference numerals

10, 50 Upper mold 20, 60 Lower mold 30 Cooking container 31 Bottom 40 Magnetic metal plate 41 Hole 42 Projection 43 Peripheral edge of hole 44 Inclined surface 45 Horizontal plane A Central part B Peripheral part K Space S ₁ First press metal Mold device S2 _Second press mold device

Claims (8)

A metal plate disposed on the bottom of the cooking container,
The metal plate includes a locking portion embedded in a bottom outer surface of the cooking container,
The locking portion comprises a cylindrical protrusion surrounding the hole passing through the metal plate and protruding toward the bottom of the cooking container,
The metal plate provided on the bottom of a cooking container, wherein the protrusion is formed to be 3.0 times or less the thickness of the metal plate. The metal plate according to claim 1, wherein a corner is formed between the protrusion and a horizontal surface of the metal plate. The peripheral part of the said hole was formed in the round shape which has a curvature radius of 1.5 times or less of the thickness of the said metal plate, The bottom part of the cooking container of Claim 1 characterized by the above-mentioned. Metal plate. A cooking container with a metal plate on the bottom,
The metal plate includes a locking portion embedded in a bottom outer surface of the cooking container,
The locking portion comprises a cylindrical protrusion surrounding the hole passing through the metal plate and protruding toward the bottom of the cooking container,
The protrusion is formed to be 3.0 times or less the thickness of the metal plate,
The cooking container, wherein the projection is embedded in the bottom. The cooking container according to claim 4, wherein the protrusion is embedded in the outer surface of the bottom in a bent state. The said protrusion is embedded in the bottom part of the said cooking container so that the inner peripheral surface of the said protrusion and the horizontal surface of the said metal plate may make an angle of 30 degrees or more and 85 degrees or less. Item 5. The cooking container according to Item 4. A method for producing a cooking container provided with a metal plate on a bottom outer surface,
A step of disposing the bottom of the cooking container and the metal plate so as to overlap an outer surface of the bottom between the first mold and the second mold having a rounded joint;
The first mold and the second mold are clamped, and the metal plate and the bottom of the cooking container are formed into a curved shape, and the locking portion protruding from the metal plate is formed into the cooking container. Embedding in the bottom outer surface of the
Arranging the bottom of the cooking vessel to which the metal plate is joined, between the third mold and the fourth mold whose joints are horizontal;
A step of clamping the third mold and the fourth mold and flattening the bottom portion. In the step of clamping the first mold and the second mold and embedding a locking portion protruding from the metal plate into an outer surface of a bottom of the cooking container, The method for manufacturing a cooking container according to claim 7, wherein the bottom of the container is press-formed at a curved depth within four times the thickness of the metal plate.

Images