WO2002001991A1

WO2002001991A1 - Cooking container

Info

Publication number: WO2002001991A1
Application number: PCT/JP2001/005475
Authority: WO
Inventors: Mamoru Takehara
Original assignee: Takehara Can Co., Ltd.
Priority date: 2000-06-30
Filing date: 2001-06-26
Publication date: 2002-01-10
Also published as: CN1440252A; KR20030011933A; JP4139682B2; CN1204845C; TWI250006B

Abstract

A cooking container having a ferromagnetic sheet metal (3) superimposed on the bottom outer flat surface part of a container main body (10) formed of a base material (14) made of nonmagnetic metallic material, wherein an opening part (6) having a bent part (5) formed so that the opening edge part (7) thereof faces the bottom outer flat surface part (11) side is provided on a ferromagnetic metal plate (3), the bent part (5) is pressurized in such an attitude that faces the bottom outer flat surface (11) in the state that the bottom inner flat part (12) of the container main body (10) is supported by a rigid flat surface, and the bent part (5) is press-fitted into the bottom part of the container main body (10) so as to vary the surface state of an impressed part (13) in the bottom inner flat surface part (12) at a position corresponding to the bent part (5) of the ferromagnetic sheet metal (3) so as to form a pattern produced due to a difference in surface state on the bottom inner flat surface part (12).

Description

Description Cooking containers Technical field

The present invention relates to a cooking container in which a ferromagnetic metal plate is integrally connected to a bottom outer flat surface formed on a bottom outer surface of a container body made of a non-magnetic metal material as a base material. Background art

For example, a pot commonly used for cooking, such as a pan made of aluminum, is a simple example of a pot formed by forming a pot shape from an aluminum plate into a pot shape by subjecting the surface of the pot to a grinding process or an anodizing process. Some pots are commercially available, and some of them have an embossed pattern that gives the appearance of a set-up pot with an improved design. However, no attempt has been made to change the boiling state when boiling water with the pot. That is, there is a conventional cooking container with a pattern, but no cooking container with a pattern that provides an effect when used for cooking is seen. In view of the above, the present invention provides a cooking container made of aluminum as a material while facilitating use of the cooking container, forming a pattern on the bottom inner surface, imparting an aesthetic appearance to the inner surface of the cooking container, and using the cooking container. It is intended to bring about a change in the boiling state particularly when cooking using an electromagnetic cooker. Disclosure of the invention

In the present invention, a bottom outer flat portion is formed on the bottom outer surface of a container body made of a nonmagnetic metal material represented by aluminum, and a strong magnetic metal plate such as a stainless steel plate is formed on the bottom outer flat portion. The present invention relates to a cooking container such as a pot or a frying pan which is integrally connected. An opening is formed in the ferromagnetic metal plate, and the ferromagnetic metal plate is provided with a bent portion formed by bending the edge of the opening toward the side to be overlapped with the bottom outer flat surface. A bottom inner flat surface is formed on the inner surface of the bottom of the container body. While the inner flat surface is supported by a rigidly formed flat surface, the side of the ferromagnetic metal plate where the bent portion is formed is the outer flat surface of the container body. And press each bent portion into the bottom from the outer surface of the bottom. By press-fitting the bent portion, the ferromagnetic metal plate is integrally connected to the bottom outer flat portion and overlaps the container main body. Further, when the ferromagnetic metal plate is pressed toward the container body, the ferromagnetic metal plate entirely sinks into the base material from the bottom outer flat surface portion, and the bottom portion of the ferromagnetic metal plate Compressive deformation occurs in the area projected on the bottom inner surface side in the base material. With the compressive deformation occurring in the projection region, a compression mark portion is formed on the bottom inner flat portion corresponding to the arrangement region of the ferromagnetic metal plate. In particular, the compression mark portion corresponding to the bent portion becomes a slightly convex portion slightly protruding from the surroundings even after the pressing force is released due to severe compression of the base material inside the compression mark portion. In the bottom inner plane portion which is the inner surface of the projection area, when the projection area is entirely compressed, the surface is pressed against a flat mold to smooth the surface, or The surface condition changes so that it is compacted to increase its glitter. The reason why the compression marks on the inner surface of the bottom are smoothed or the glitter is increased is that the fine protrusions remaining during the polishing and fine machining of the inner surface of the bottom are crushed and crushed into fine grooves and grooves. It is thought to be because the recess is closed. The present invention is characterized in that, in the formed compression mark portion, the surface state changes to a surface state different from that of the periphery of the compression mark portion and a pattern is formed on the inner bottom flat portion.

In this pattern, the bent portion provided in the opening formed in the ferromagnetic metal plate was press-fitted, whereby the bottom inner flat portion corresponding to the region subjected to strong compressive deformation slightly protruded to form a fine convex portion. Compression scars may appear due to appearance differences from the surroundings. Further, since the inside of the compression mark portion has been subjected to the compression processing, the surface is smoothed by the compression processing, the glittering property is increased, and a pattern may appear due to the difference in the glittering property. Thus, a pattern is formed on the inner bottom surface of the container body due to the difference in the surface condition of the inner flat surface portion. The bent portion is desirably formed in a cylindrical shape. When this bent portion is pressed into the base material of the container body, the reaction force exerted on the bent portion from the base material tends to act on the bent portion as an external bending force, but the bent portion has a cylindrical shape. This is because if it is formed, it can easily withstand the bending external force. As a result of press-fitting the bent portion into the container main body, an annular compression mark corresponding to the press-fitted bent portion is clearly formed on the inner flat surface of the bottom of the container main body. is there. In order to form the compression marks formed in this way into the same shape, the bent portions should be substantially the same. It can be formed by a small punch and a die. For example, it can be efficiently processed by a press machine called a turret punch press. In other words, processing can be made more efficient. And, if the compression mark portion is evenly distributed on the bottom inner flat portion, when the cooking container is used in an electromagnetic cooker, the steam bubble generation points are evenly dispersed, so that uneven heating or As a result, spills can be prevented without causing local boiling. In addition, if the compression mark portion is formed so that the area ratio of the flat surface portion in the bottom is uniform, steam bubbles are generated evenly in the cooking container, so that the boil is partially cooked in the case of cooked food or the like. Can be prevented. This can be achieved by uniformly disposing the openings formed in the ferromagnetic metal plate. In the case where the ferromagnetic metal plate is provided with openings having different opening diameters, the area of the compression mark portion is made different so that the steam bubble generation point is evenly distributed on the bottom inner flat surface of the cooking container. It becomes possible to arrange.

A case where the change in the surface state is brought about by the slightly elevated portion will be described. The thickness of the bottom of the container body made of a nonmagnetic metal material is preferably about 1.6 to 2.6 mm when an aluminum material is used. When the ferromagnetic metal plate is made of ferritic stainless steel or martensitic stainless steel, the thickness of the ferromagnetic metal plate which is superimposed and integrally bonded is 15 to 15 times the thickness of the base material. It is preferable that the thickness is 25% (that is, the thickness of the ferromagnetic metal plate is about 0.24 to 0.65 mm). The change in the surface state varies depending on the thickness of the ferromagnetic metal plate, and a slight convex portion having a height as small as about 20 micron or less is formed as a compression mark, or a compression mark is formed. The smoothness of the surface of the scar is increased, or the glitter is enhanced. The slightly elevated portion is formed by press-fitting a bent portion formed on the ferromagnetic metal plate into a bottom portion of the container body.

By the way, when boiling water in a pot according to the present invention configured as described above, the pot is placed in an electromagnetic cooker, the ferromagnetic metal plate generates heat, but the base made of non-magnetic metal material does not generate heat. . In addition, when the non-magnetic metal material is aluminum, heat conduction is extremely rapid, and the compression traces on the inner flat surface immediately follow the heat generation of the ferromagnetic metal plate. Therefore, corresponding to the above-mentioned pattern, it boiled strongly in the compression mark part, and few steam bubbles were generated in the part around it. Therefore, the pattern formed by the compression In response, a boiling pattern is created inside the pot. Since the boiling point can be localized in this way, it is easy to prevent spills.

It is preferable that the compression mark portion has a slightly high convex portion in which a plurality of the same shape are dispersed and arranged on the bottom inner flat surface portion. That is, a plurality of openings having the same shape are formed in the ferromagnetic metal plate, and the bent portions formed on the peripheral edge of the openings are respectively pressed into the bottom of the container body from the bottom outer flat surface.

As a specific example, first, the ferromagnetic metal plate is pierced in a dice from the front side to the back side (that is, the side overlapping the bottom of the pot) from the front side to the punch side by punching the ferromagnetic metal plate. punc h) to form a plurality of openings having bent portions projecting toward the rear surface side by performing a burring process that forms openings having cylindrical portions bent from the periphery. Is formed. The bent portion is formed in a tubular shape or a split tubular shape around each opening. That is, depending on the ratio of the diameter of the pilot hole to be drilled in advance to the diameter of the opening, or the shape of the tip of the punch, the bent portion is formed in a cylindrical shape, a cracked cylindrical shape, or the tip thereof. The part may be formed as a point. If the diameter of the pilot hole is larger than the diameter of the opening, it will be cylindrical, if the diameter of the pilot hole is small, it will be a tearing cylindrical shape, and if it is smaller, it will form a point.

Specifically, the bent portion is formed as a rising portion having a height of about 1 to 2.5 mm, for example. Since the bent portion formed in this way is deeply pressed into the base material constituting the bottom of the container body, the distance from the tip of the bent portion to the surface of the bottom inner flat portion is short. For example, if the bottom has a thickness of 1.6 to 2.6 mm, the tip of the bent portion is located 0.5 to 1 mm below the surface of the bottom inner flat portion. As a result, a compression mark is formed on the inner surface of the bottom near the tip as a micro-protrusion that forms irregularities of about 20 microns or less. At the same time, the compression scars slightly protrude, and at the same time, the surface is smoothed, resulting in a state of rich glitter. In addition, when this pot is placed on an electromagnetic cooker, the bent portion generates heat, so that steam bubbles are generated near the tip of the pot, which is different from the case where the temperature is almost uniform in a plane. Vapor bubble generation point does not move. Therefore, when viewed from above in a state where the hot water is being boiled, a pattern formed by steam bubbles, similar to the pattern formed by the compression scars, is seen. So, the usual In the case of boiling in a cooking vessel, the boiling liquid level of the hot water rises so as to rise in an annular shape, whereas the vapor bubble generation points are discrete and their positions are fixed. The rise of the surface is suppressed, and spills can be prevented.

It is preferable that the generation points of the vapor bubbles are uniformly distributed on the bottom of the pot, and for that purpose, it is preferable that the pattern on the flat surface inside the bottom is formed uniformly. That is, it is preferable that the bent portion is formed substantially uniformly. For example, openings having the same diameter are formed uniformly in a ferromagnetic metal plate. If this is formed by using a processing method of forming a flange around the opening such as parling, the bent portion formed by this is used as a container body that supports the inner bottom flat surface with a rigid plane. When press-fit into the bottom outer flat part, an annular press mark corresponding to the bent part is formed.

Further, the present invention also includes forming a central opening in the ferromagnetic metal plate at a position corresponding to the center of the bottom outer flat portion. A bent portion formed by bending the opening edge toward the back side is also formed at the opening edge of the central opening. Then, when the ferromagnetic metal plate is pressed against the bottom outer flat portion, the bent portion is pressed into the base material deeper than the sink of the ferromagnetic metal plate into the base material. is there. As a result, the adhesion of the ferromagnetic metal plate at the center to the substrate can be further strengthened. If the central opening is formed in a circular shape, the stress in the ferromagnetic metal plate due to the press-fitting and subsequent thermal history can be released by the central opening. Furthermore, when this cooking container is used for an electromagnetic cooker, the temperature sensor of the electromagnetic cooker located in the center does not have to detect the temperature of the ferromagnetic metal plate, and the heating temperature during cooking is eliminated. Can be prevented from being restricted. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view of a main part showing an inner surface of a pan as an example of a cooking container according to the present invention,

FIG. 2 is a plan view of a main part showing the outer surface,

FIG. 3 is a longitudinal sectional view schematically showing a pot on which ferromagnetic metal plates are superimposed,

FIG. 4 is a longitudinal sectional view showing the shape of the ferromagnetic metal plate before press fitting.

FIG. 5 is a perspective view of the ferromagnetic metal plate viewed from the container body side before the superposition, Fig. 6 (a) and Fig. 6 (b) are longitudinal sections of the main part showing the process of superimposing and integrating the ferromagnetic metal plate on the bottom of the container body, and Fig. 6 (a) shows the state before joining. FIG. 6 (b) is an explanatory diagram showing the combined state,

Fig. 7 is a plan view showing the state of boiling when hot water is boiled in the pot, as viewed from above.

FIG. 8 is a plan view showing the inner surface of another pot as an example of the cooking container according to the present invention, and FIG. 9 is an enlarged view of a local portion thereof.

FIG. 10 is a plan view of the pot viewed from the bottom outer surface side,

Fig. 11 is an enlarged view of a section parallel to the local pot bottom,

FIGS. 12 (a), 12 (b), and 12 (c) are enlarged perspective views of main portions showing examples of changes in the bent portion of the ferromagnetic metal plate fixed to the container body.

FIG. 13 is a longitudinal sectional view schematically showing a boiling state when hot water is boiled by an electromagnetic cooker using a pan according to another example.

FIG. 14 is an enlarged sectional view schematically showing the vapor bubble generation point.

FIG. 15 is a longitudinal sectional view of a main part showing another example of the opening formed in the ferromagnetic metal plate, and FIG. 16 is a perspective view seen from the bottom side of a pan on which the ferromagnetic metal plate is superimposed. ,

FIG. 17 is a longitudinal cross-sectional view of a main part showing the bottom of the pot on which the ferromagnetic metal plates are superimposed and fixed. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings. An example of a preferred embodiment for carrying out the present invention is shown in FIGS. In this example, the cooking container is a pan P having a circular shape in a plan view, and the non-magnetic metal material constituting the base material 14 of the container body 10 is made of an aluminum material, and has been subjected to migaki processing. . The thickness of the base material 14 is 2.3 mm, and the ferromagnetic metal plate 3 to be superimposed and fixed thereon has an outer diameter of about 140 to 220 mm and a cross-shaped opening of 0.4 mm in thickness. A ferromagnetic stainless steel plate on which 6 is formed (hereinafter referred to as a ferromagnetic stainless steel plate 3 in place of the ferromagnetic metal plate 3) is used. Figure 1 shows a circular strong magnetic field on the bottom outer flat surface 11 of the container body 10 with the aluminum material as the base material 14 and the side wall 2 standing upright around the bottom 1. The inner surface of the pot P to which the conductive stainless steel plate 3 is fixed is shown. As shown in FIG. 2, a circular ferromagnetic stainless steel plate 3 having a cross-shaped opening 6 having a central portion is superposed and fixed on the outer surface of the bottom 1 of the pot P as shown in FIG. As shown in the figure, on the inner bottom surface portion 12 of the pot P, a very high convex portion having a contour substantially the same as the shape of the ferromagnetic stainless steel plate 3 is formed as a compression mark portion 13. The thickness of the bottom portion 1 of the container body 1 is preferably 1.6 to 2.6 mm, but in this example, it is 2.3 mm. Further, the thickness of the ferromagnetic stainless steel plate 3 is preferably 15 to 25% of the thickness of the bottom portion, but in this example, the thickness of the ferromagnetic stainless steel plate 3 is 0.4 mm. The ratio of the bottom 1 to the thickness is 17%.

As shown in FIG. 3, the ferromagnetic stainless steel plate 3 is pressed from the outer surface side of the bottom 1 of the container body 10 forming the pot P toward the bottom outer flat surface portion 11 as shown in FIG. And are integrally fixed on the outer surface side of the bottom portion 1 of the base. The base material 14 of the container body 10 is exposed to the opening 6 of the ferromagnetic stainless steel plate 3 and partially fills the inside of the opening 6. The ferromagnetic stainless steel plate 3 has a circular shape, and as shown in FIG. 4, a cross-shaped opening 6 having a central portion formed in an oval shape. As shown in FIG. 5, the opening edge portion 7 is formed with a bent portion 5 which is bent obliquely toward the container body 10 (upper side in the figure) over the entire circumference. In addition, a bent portion 5 that is bent obliquely over the entire circumference toward the same side is also formed on an outer peripheral portion 4 of the ferromagnetic stainless steel plate 3.

As shown in FIG. 6 (a), the ferromagnetic stainless steel plate 3 is placed between a pair of dies 15 and 15 having a rigid pressurized surface formed in a plane by using a press machine or the like. And pressurize it toward the bottom of the container body 10. Then, the ferromagnetic stainless steel plate 3 is pressed into the bottom 1 of the container body 10 and sinks. Here, as shown in FIG. 6 (b), the bent portion 5 formed on the peripheral edge 4 and the opening edge 7 of the ferromagnetic stainless steel plate 3 is further attached to the bottom 1 from the bottom outer flat surface 11 side. Insert deeply. Then, as a result of the ferromagnetic stainless steel plate 3 sinking into the bottom portion 1 from the outer surface side, the base material 1 of the projection region of the ferromagnetic stainless steel plate 3 onto the inner bottom flat portion 12 in the container body 10 is formed. 4 is compressed and deformed. If the distance between the planes of the two dies 15, 15 is set to be approximately equal to the thickness of the bottom 1 at the closest point, and about 2.3 mm, then As shown in (b), a compression mark portion 13 is formed in the bottom inner flat portion 12 as a very high convex portion in which a region corresponding to the ferromagnetic stainless steel plate 3 protrudes about 20 microns. Is done. As a result, on the inner surface side of the pot P, the same as the opening 6 formed in the ferromagnetic stainless steel plate 3 on the bottom inner flat part 12 and the cross-shaped center part as shown in FIG. A pattern indicating the contour is formed.

In the press-fitting step shown in FIGS. 6A and 6B, the bent portion 5 formed by bending the peripheral portion 4 of the ferromagnetic stainless steel plate 3 is moved from the bottom outer flat portion 11 to the inside of the base material 14. The peripheral edge portion 4 is fixed to the bottom outer flat portion 11. Therefore, even if the temperature of the ferromagnetic stainless steel plate 3 is repeatedly increased by repeatedly using the pan P on which the ferromagnetic stainless steel plate 3 is superimposed, the ferromagnetic stainless steel plate 3 is prevented from being lifted off the container body 10 and peeled off. it can.

When the pot P thus formed was placed in an electromagnetic cooker and the water was boiled, as shown in FIG. 7, the shape of the ferromagnetic stainless steel plate 3 was changed to the bottom inner flat portion 12 of the pot P by steam bubbles B. It emerges as a pattern. In other words, in the region of the compression mark portion 13 formed in the bottom inner flat portion 12 of the pot P, it boils to generate a steam bubble B, and corresponds to the opening portion 6 formed in the ferromagnetic stainless steel plate 3. Strong boiling does not occur in the region of the bottom inner flat portion 12.

The pattern that emerges due to the steam bubbles B substantially matches the pattern formed on the bottom inner flat portion 12. When the pot P is heated by an electromagnetic cooker, the ferromagnetic stainless steel plate 3 generates heat, and the heat is applied to the compression mark portion 1 formed on the bottom inner flat portion 1 2 through the aluminum material as the base material 14. The steam bubbles B are generated in the area of the compression mark portion 13. However, in the opening 6 formed in the ferromagnetic stainless steel plate 3, the aluminum material forming the base material 14 exposed here does not generate heat, so the bottom inner flat portion 12 corresponding to the opening 6 does not generate heat. In the region, the temperature does not rise to as high as the compression mark portion 13 and no vapor bubble B is generated. As a result, as shown in the figure, the vapor bubbles B are generated in a state where the bottom inner flat surface portion 12 is divided into four parts, thereby forming a pattern. Therefore, if the shape and arrangement of the openings 6 formed in the ferromagnetic stainless steel plate 3 are devised, various patterns can be formed with the steam bubbles B on the bottom inner flat portion 12 of the pot P. For example, if the openings 6 are formed in the ferromagnetic stainless steel plate 3 by arranging them in a star shape, the pattern formed by steam bubbles B Becomes a star.

8 to 14 show other examples of a preferred embodiment for carrying out the present invention. Also in this example, the cooking container is a circular pot in a plan view, the non-magnetic metal material forming the container body is aluminum material, the thickness is 2.3 mm, and the ferromagnetic metal plate adhered thereto. As 3, a ferromagnetic stainless steel plate having a thickness of 0.4 mm and having circularly formed openings 6 dispersed by burring using a circular die and a die made of a round bar is used. FIG. 8 shows the inner surface of the pot P in which the ferromagnetic stainless steel plate 3 subjected to burring is fixed so as to overlap the bottom outer flat surface portion 11. Then, as shown in FIG. 9 in an enlarged manner, a part of the bottom inner flat surface 12 is provided with a ring-shaped very high convex portion, and the compression mark portion 1 having a smooth surface and imparting brilliancy is provided. Three or more are dispersed and formed. FIG. 10 is a plan view from the bottom outer surface side of the pot P, and a circular ferromagnetic stainless steel plate 3 is fixed to the bottom outer flat portion 11 of the container body 10 and The plurality of openings 6 formed in the ferromagnetic stainless steel plate 3 expose the aluminum material, which is the base material 14 of the container body 10, as shown in FIG. 11 in which one of the openings 6 is enlarged. . The opening 6 is partially filled with a base material 14 made of an aluminum material. Then, on the peripheral portion, annular projecting portions slightly protruding are formed. That is, due to the resistance of the bent portion 5 against press-fitting into the aluminum material, the ferromagnetic stainless steel plate 3 is located behind the bent portion 5, that is, at the position of the opening edge 7 of the opening 6 in the ferromagnetic stainless steel plate 3. It becomes slightly protruding.

The ferromagnetic stainless steel plate 3 has a bent portion 6 formed on the periphery thereof, as in the case of the periphery 4 shown in FIG. 4, and at the same time, over the entire surface toward the container body 10. A plurality of dispersed circular openings 6 are formed. The bent portion 6 is also bent at the opening edge 7. When the opening 6 is formed by punching out the ferromagnetic stainless steel plate 3 by a burring process or the like, the opening 6 is shown in an enlarged manner in FIGS. 12 (a), 12 (b) and 12. As shown in (c), a rising portion 8 having a height of about 1.8 mm and being bent around the opening 6 is formed as the bent portion 5. In the figure, the upper side is the back side from which the punch is extruded. The shape of the rising portion 8 depends on the size of the pilot hole, the clearance between the punch and the die, and the ferromagnetic stainless steel. It changes depending on the relationship with the thickness of the loess plate 3, etc., and it is cylindrical (see Fig. 12 (a)), or it has a split tubular shape that is split along the rising direction (Fig. 12 (b) (See Fig. 12 (c).), Or the tip T is a sharp protrusion formed sharply.

As described above with reference to FIGS. 6 (a) and 6 (b), the ferromagnetic stainless steel plate 3 also has the bottom outer flat portion 1 Then, the ferromagnetic stainless steel plate 3 is pressed into the container main body 10 from the outer surface side of the bottom portion 1 so that the ferromagnetic stainless steel plate 3 is superposed and fixed on the container main body 10. Here, a large number of bent portions 5 are formed, and the bent portions 5 are erected substantially at right angles. Therefore, as shown in FIG. Inside, it is deeply pressed from the bottom outer flat portion 11 side and is firmly fixed, and at the same time, the rising portion 8 is formed relatively rigid, so that the tip T of the container body 10 is It reaches near the inner surface of the bottom inner flat portion 12. Its tip T extends from the inner surface to approximately 0.5 mm. In other words, the reason why the above-mentioned ring-shaped minute convex portion is formed as the compression mark portion 13 is that it is formed near the tip end T of the rising portion 8.

Therefore, when hot water is boiled in the electromagnetic cooker using the pot P, as shown in FIG. 13, the bottom inner flat portion 1 near the tip T of the rising portion 8 forming the bent portion 5 is formed. The generation point of the vapor bubble B is located in the compression mark portion 13 formed in 2. In other words, the compression scar 13 forms a heat spot. Therefore, as shown in the enlarged view of FIG. 14 in the bottom inner flat portion 12, the vapor bubble B is continuously generated from each compression mark portion 13, and the foaming point does not move. In this way, the generation point of the steam bubble B does not move, and the steam bubble B is continuously generated, and the steam bubble B rises almost directly upward, and the hot water A from the convective boiling liquid level F falls between them. As a result, convection occurs in a small area inside the pot P, and the pot P boils evenly without large convection. Therefore, the boiling state is mild, and the boiling liquid level F of the hot water A is stable without increasing much. As a result, it is possible to prevent the boiling liquid level F from rising up in an annular manner as in a conventional pot and causing spillage. In addition, the generated vapor bubbles are prevented from causing bumping, which is often seen in a common pot bottom, which moves along the bottom face. In such a configuration, a plurality of openings 6 are formed on the opening edge 7 of the opening 6. Due to the rising portion 8, the compression mark portion 13 is formed mainly near the tip portion T thereof. Therefore, by changing the opening diameter and the arrangement of the opening 6, the pattern formed on the bottom inner flat surface portion 12 can be changed. Since the compression marks 13 thus formed become heat spots, the convection in the pot P can be controlled to a desired form when the hot water A boils, and the boiling state can be stabilized.

As another preferred mode for carrying out the present invention, as shown in FIG. 15, which is a longitudinal sectional view showing the center of the ferromagnetic metal plate, the ferromagnetic stainless steel plate 3 has an opening. As one of the six, a circular center opening 9 is formed in the center of the ferromagnetic stainless steel plate 3 (the openings 6 other than the center opening 9 are not shown in FIG. 15). The opening edge 7 of the opening 9 is obliquely bent toward the container body 1 (not shown) side (upper side in the figure) of the ferromagnetic stainless steel plate 3 over the entire circumference, as shown in FIG. A bend 5 is formed at the rim 7. The configuration described in the above two embodiments can be applied to another opening 6 (not shown) formed between the outer peripheral portion 4 of the ferromagnetic stainless steel plate 3 and the outside thereof. In addition, any configuration can be adopted. As shown in FIG. 17, if this ferromagnetic stainless steel plate 3 is superimposed on and fixed to the bottom outer flat portion 11 of the pot P, the bent portion 5 is formed in the base material 14 of the bottom outer flat portion 11. However, the ferromagnetic stainless steel plate 3 is securely fixed to the bottom outer flat portion 11 by being pressed deeper than the surroundings by a fitting input having a component directed toward the center of the central opening 9.

In this case, the steps shown in FIGS. 6 (a) and 6 (b) can also be applied to press-fit the ferromagnetic stainless steel plate 3 into the outer bottom flat portion 11. In the state where the ferromagnetic stainless steel plate 3 is fixed to the container main body 10 in this way, as shown in the figure, the center opening 9 is provided with an aluminum material as the base material 14 as a plate of the ferromagnetic stainless steel plate 3. Almost the entire thickness or a part of the thickness direction is filled and exposed. Then, the outer surface thereof is slightly lower than the surface of the ferromagnetic stainless steel plate 3. The aluminum material, which is the base material 14 exposed in the central opening 9 in this way, receives resistance to the center side thereof by the opening edge 7, and the ferromagnetic stainless steel plate 3 is Opening 9 secures securely. In addition, since the ferromagnetic stainless steel plate 3 has its central opening 9 releasing stress in the radial direction at the center, distortion can be suppressed, and even if heating is repeated by the electromagnetic cooker, It is difficult to peel off from the main unit 10. I No steam bubbles B are generated at the center of the flat bottom surface 12 corresponding to the center opening 9, that is, at the center of the pot P. Therefore, when using a cooking container as a tofu pan, steam bubbles are not generated from under the dashi container placed in the center of the pan, so that the dashi container is stable without being disturbed by the pressure of steam. It will be easier.

In general, the electromagnetic cooker is equipped with a temperature sensor at the center of the top surface to detect the temperature at the bottom of the pot and prevent overheating. If a metal plate is present, the temperature of the ferromagnetic metal plate, which is higher than that of the actual cooking container, is detected without detecting the temperature of the container itself. As a result, even if the temperature of the container body has not reached the limit temperature, heating is stopped assuming that the temperature of the cooking container has reached the limit temperature, and the temperature lower than the limit temperature for preventing overheating is set to the maximum temperature. The temperature will be adjusted. In other words, since the central opening of the heat-generating ferromagnetic metal plate is located at the position where the temperature is detected by the temperature sensor, the temperature sensor determines the temperature of the base material constituting the exposed container body. As a result, it is possible to avoid the above-mentioned obstacles such as lowering the cooking temperature. Industrial applicability

As described above, the cooking container according to the present invention can enhance the appearance by forming a pattern on the inner surface, and can form a pattern by steam bubbles when hot water is boiled by an electromagnetic cooker. In addition, while the container body is formed of a non-magnetic metal material having good thermal conductivity, the thermal efficiency when used in an electromagnetic cooker can be improved, and spills can be prevented. Furthermore, the ferromagnetic metal plate is fixed to the container main body by pressing the periphery of the opening into the base material of the container main body so that the ferromagnetic metal plate is not easily peeled off, and the cooking container can withstand repeated heating by the electromagnetic cooker. .

Claims

The scope of the claims

1. A cooking container in which a ferromagnetic metal plate is superimposed on an outer flat surface of the bottom of a container body made of a non-magnetic metal material,

A state in which the ferromagnetic metal plate is provided with an opening having a bent portion with its opening edge directed toward the bottom outside flat surface side, and the bottom inside flat portion of the container body is supported by a plane having rigidity; Then, the bent portion is pressed in a posture facing the outer bottom flat portion, and the bent portion is pressed into the bottom portion of the container body, whereby the bending of the ferromagnetic metal plate in the inner flat surface portion is performed. A cooking container in which a pattern resulting from the difference in the surface state is formed on the bottom inner flat part by changing a surface state of the compression mark part corresponding to the part.

2. The cooking container according to claim 1, wherein said pattern is formed by a plurality of compression marks formed in an annular shape.

3. The conditioning container according to claim 2, wherein the compression mark portions are formed in the same shape.

4. The cooking container according to claim 2, wherein the compression mark portions are uniformly distributed on the bottom inner flat surface portion.

5. The cooking container according to claim 2, wherein the compression mark portions are distributed and arranged so that an area ratio in the bottom inner flat surface portion is uniform.

6. The cooking container according to claim 2, wherein the compression mark portions are formed to have different areas.

7. The ferromagnetic metal plate is subjected to a perling process or a stretch flange process in which a punch is inserted into a die from the front surface side to the bottom outer flat surface side to perform a punching process, and the ferromagnetic metal plate is formed at a plurality of locations. An opening is formed, and the bent portion is formed by a flange formed upright on a peripheral edge of each opening, and each of the bent portions is fitted into the bottom of the container body from the bottom outer flat portion. 2. The cooking container according to claim 1.

8. The cooking according to claim 7, wherein the opening is formed by using a die having a cylindrical inner surface as the die and using a punch having a circular cross section as the punch. Container.

9. Align the opening edge with the center of the bottom outer flat part and set the opening edge to the bottom outer flat part side A central opening bent toward is formed in the ferromagnetic metal plate as the opening, and the opening edge is fitted into the bottom from the outer surface of the bottom, and the container body is moved from the central opening. 2. The cooking container according to claim 1, which is exposed.

10. The cooking container according to claim 9, wherein the central opening is formed in a circular shape.