JP2001353068A - Heating cooking utensil and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid waste on materials, to suppress unevenness of heating and to easily and surely bond a cooking utensil body with a bottom face member consisting of a stainless steel in a pot in which the stainless steel for electromagnetic induction heating is provided on the bottom face part of the cooking utensil body consisting of aluminum. SOLUTION: The second bottom face member 11 consisting of the stainless steel being a magnetic metal material is bonded on the bottom face part of the cooking utensil body 2 consisting of aluminum through the first bottom face member 6 consisting of aluminum. When the cooking utensil is manufactured, at first, the cooking utensil body 2, the first bottom face member 6 and the second bottom face member 11 are respectively independently molded. Thereafter, by combining these and heating them from the outside, the cooking utensil body 2, the first bottom face member 6 and the second bottom face member 11 are welded by brazing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking utensil such as a pot or a frying pan made of a plurality of materials and a method of manufacturing the same, and more particularly to a cooking utensil suitable for electromagnetic induction heating and a method of manufacturing the same.

[0002]

Recently, cooking utensils such as a pot or a frying pan for electromagnetic induction heating have been used. The material of the cooking device for electromagnetic induction heating must be a magnetic metal, and for example, ferrite stainless steel or the like is used as the magnetic metal. However, stainless steel is heavier than aluminum, etc., and does not have good thermal conductivity.
It is not necessarily suitable as a material for cooking utensils.

Therefore, as described in, for example, Japanese Patent Application Laid-Open No. Hei 5-91950, a heating cookware in which stainless steel is provided only on the bottom surface of a cookware body made of aluminum, which is a nonmagnetic metal, has been proposed. I have. In the cooking device described in the above publication, at least a portion of the stainless steel member is embedded in the aluminum plate by drop forging or stamping a grid-shaped or perforated sheet-shaped stainless steel member on an aluminum plate serving as a cooking utensil main body. In addition, the assembly of the aluminum plate and the stainless member fixed in this manner is formed into a shape of a cooking appliance by deep drawing.

[0004] When a heating cooker is formed by pressing such as drawing, the material thickness is basically uniform over the whole. However, if the material thickness is small, uneven heating tends to occur particularly during heating cooking with an open fire, and the cooked food may be scorched and cooking may not be performed well. As a result, there is a possibility that the coating such as a fluororesin formed on the inner surface of the cooking device may be peeled off, or the cooking device itself may be deformed. On the other hand, when the thickness of the material is increased as a whole, unevenness in heating is suppressed, but the cooking device becomes excessively heavy, which reduces the handleability and wastes the material. Therefore, it is conceivable to mainly increase the thickness of only the bottom portion of the heated cooking utensil. However, when molding the cooking utensil by drawing, it is necessary to adjust the material thickness by performing cutting or the like later. However, there are problems that the number of steps increases and that waste of materials is inevitable.

[0005] Further, when a plurality of members are joined by forging or stamping as in the above-mentioned publication, air may be sealed in a joint between the members. The presence of such enclosed air may cause the enclosed air to expand at the time of heating and cooking, causing the cooking appliance to be deformed or damaged in the worst case.

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem. In a heating cooker in which a non-magnetic metal material and a magnetic metal material are joined, uneven heating can be suppressed without wasting the material. The first purpose is to make
A second object is to easily and surely join a nonmagnetic metal material and a magnetic metal material.

[0007]

According to a first aspect of the present invention, there is provided a heating cooking appliance, wherein the cooking appliance main body made of a non-magnetic metal material is provided on a bottom portion of the cooking appliance main body. Is formed by interposing a first bottom member made of a separate non-magnetic metal material and joining a second bottom member made of a separate magnetic metal material to the cooking utensil main body and the first bottom member. Things.

The presence of the second bottom member made of the magnetic metal material enables electromagnetic induction heating cooking. Also,
By interposing the first bottom member made of a non-magnetic metal material between the second bottom member and the cooking utensil body made of a non-magnetic metal material, the bottom portion of the cooking utensil can be used without any waste of material. Can be thicker than other parts. Accordingly, uneven heating can be suppressed even when heating and cooking is carried out particularly over a direct fire.

According to a second aspect of the present invention, in order to achieve the second object, a magnetic metal separate from the cooking utensil main body is provided on the bottom of the cooking utensil main body made of a non-magnetic metal material. The bottom member made of a material is joined by welding.

The presence of the bottom member made of the magnetic metal material enables electromagnetic induction heating cooking. Further, by welding, the cooking utensil body made of a non-magnetic metal material and the bottom member made of a magnetic metal material can be easily and reliably joined. Moreover, in the case of welding, various materials can be joined, and the molten material penetrates into the joint between the cooking utensil body and the bottom member, so that air can be suppressed from being sealed in this joint. .

[0011] The cooking device according to the third aspect of the present invention is the cooking device according to the third aspect.
In order to achieve the first and second objects, a first bottom member made of a non-magnetic metal material separate from the cooking utensil body is provided on a bottom portion of the cooking utensil body made of a non-magnetic metal material. The appliance body and the first bottom surface member are joined to a second bottom surface member made of a separate magnetic metal material, and at least the joint between the cooking appliance body and the first bottom surface member is welded. It is.

Electromagnetic induction heating cooking can be performed by the second bottom member made of a magnetic metal material. Also, by joining the bottom member including the first bottom member made of the non-magnetic metal material to the bottom portion of the cooking utensil body made of the non-magnetic metal material, the bottom portion of the cooking utensil can be placed on the side without waste of material. It can be thicker than other parts such as parts. Accordingly, uneven heating can be suppressed even when heating and cooking is carried out particularly over a direct fire. Further, by welding, the cooking utensil main body and the first bottom surface member can be easily and reliably joined. In addition, when welding is performed, various materials can be joined, and the molten material penetrates into the joint between the cooking utensil main body and the first bottom surface member, so that air is sealed in this joint. Can be suppressed.

[0013] The invention of claim 4 is the invention of claim 2 or 3.
In the cooking device of the invention, the joint is brazed.

By the brazing, the joining of the cooking utensil body and the bottom member can be easily and reliably performed. Further, according to brazing, the molten brazing material permeates into a joint such as the cooking utensil main body and the bottom member, so that it is possible to further suppress air from being sealed in this joint.

According to a fifth aspect of the present invention, there is provided the cooking device according to any one of the first to fourth aspects, wherein the non-magnetic metal is aluminum, an aluminum alloy or copper, and the non-magnetic metal is stainless steel. It is.

According to a sixth aspect of the present invention, in the cooking device of any one of the first to fifth aspects, a non-adhesive layer is provided on the entire surface or a part thereof.

[0017] The non-adhesive layer can suppress the adherence of foods or dirt, especially the burning.

According to a seventh aspect of the present invention, in the cooking device of the sixth aspect, the non-adhesive layer is formed of an enamel coating, a fluorine-based resin coating, or a silicon-based resin coating.

In order to achieve the second object, the method for manufacturing a heating cooker according to the invention of claim 8 is characterized in that a non-magnetic metal material and a magnetic metal material separate from the non-magnetic metal material are used. After molding each material, a bottom member made of the magnetic metal material is welded to a bottom portion of the cooking utensil body made of the non-magnetic metal material.

[0020] After joining dissimilar materials, if they are to be molded into a predetermined shape, the molding process is troublesome due to the difference in extensibility of each material or the partial thickness of the workpiece. It becomes something. On the other hand, if the bottom member is joined to the cooking utensil main body after the molding process for each material, the production becomes easy and the production cost can be reduced. Further, by welding the bottom member to the cooking utensil body, the cooking utensil body made of a non-magnetic metal material and the bottom member made of a magnetic metal material can be easily and reliably joined. Moreover, in the case of welding, various materials can be joined, and the molten material penetrates into the joint between the cooking utensil body and the bottom member, so that air can be suppressed from being sealed in this joint. . Then, in the manufactured cooking device, the electromagnetic induction heating cooking can be performed by the bottom member made of the magnetic metal material.

According to a ninth aspect of the present invention, in order to achieve the first and second objects, an aluminum plate and a brazing material are provided on a bottom surface of a cooking utensil body made of a non-magnetic metal material. With a plate material made of a magnetic stainless material such as ferritic stainless steel interposed, the aluminum plate and the brazing material are temporarily melted by heating from the outside, and then they are solidified to form the cooking appliance body. It is to join the plate material.

Thus, the plate made of a magnetic stainless material can be easily and reliably joined to the bottom of the cooking utensil body made of a non-magnetic metal material together with the aluminum plate.
Further, since the molten aluminum and the brazing material penetrate into the joint between the cooking utensil main body, the aluminum plate, and the plate material, it is possible to suppress air from being sealed in the joint.
Then, in the manufactured heating cooker, electromagnetic induction heating cooking can be performed using a plate made of a magnetic stainless steel material. In addition, by interposing an aluminum plate between the cooking utensil body and the plate material, the bottom portion of the cooking utensil can be made thicker than other portions such as the side portions without wasting material, and thereby, particularly, heated by direct fire. Even when cooking, uneven heating can be suppressed.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a cooking device and a method for manufacturing the same according to the present invention. First, a first embodiment will be described with reference to FIGS. The cooking utensil of the first embodiment is a pot 1. The pot 1 includes a cooking utensil main body 2 made of nonmagnetic metal material such as aluminum or aluminum alloy (for example, 3003). This cooking utensil body 2
Has a bottomed cylindrical shape with an open upper surface, and has a flange 3 at the upper peripheral edge. However, the flange 3 may not be provided. Further, the thickness of the cooking utensil main body 2 is entirely uniform. This material thickness is 2.5 mm as an example,
It is not limited to that. In addition, a handle mounting hole 4 for mounting a handle (not shown) is formed on the upper side of the cooking utensil main body 2.

A first bottom surface member 6 as an aluminum plate separate from the cooking utensil main body 2 is joined to a bottom surface (lower surface) outside the cooking utensil main body 2. This first
Is made of a nonmagnetic metal material such as aluminum or an aluminum alloy (for example, 1050/3003). The first bottom member 6 is formed in a substantially round plate shape. On the bottom surface (lower surface) of the first bottom member 6, a protruding edge 7 is formed in a peripheral portion. Are recessed portions 8 inside. Further, in the concave portion 8, a plurality of convex portions 9 are formed radially with respect to the center. The lower surface of the projection 9 and the lower surface of the protruding edge 7 are located on the same horizontal plane. The material thickness of the first bottom surface member 6 is, for example, 2.5 mm, but the depth of the concave portion 8 with respect to the lower surfaces of the convex portion 9 and the protruding edge portion 7 is
For example, 0.6 mm. The material thickness of the first bottom surface member 6 and the depth of the concave portion 8 are not limited thereto.

Further, in the recess 8 of the first bottom member 6, the first bottom member 6 and the cooking utensil main body 2 are provided.
A second bottom member 11, which is a separate plate member, is fitted and joined. The second bottom member 11 is made of a magnetic stainless steel material (for example, SUS430) such as a ferrite stainless steel which is a magnetic metal material. Also, the second
The bottom member 11 has a substantially round plate shape having the same diameter as the concave portion 8 of the first bottom member 6, but has a plurality of holes into which the convex portions 9 of the first bottom member 6 are fitted. It has a part 12. The material thickness of the second bottom member 11 is equal to the depth of the concave portion 8 of the first bottom member 6. That is, for example, it is 0.6 mm.
In a state where the second bottom member 11 is fitted in the concave portion 8, the lower surface of the second bottom member 11 and the lower surfaces of the projection 9 and the protruding edge 7 of the first bottom member 6 are on the same horizontal plane. Located in. As the second bottom surface member 11, a perforated metal sheet or the like can be used in addition to a round flat plate.

Further, a non-adhesive layer (coating) 16 made of enamel coating, fluorine-based resin coating or silicone-based resin coating is applied on the entire surface, that is, the inner surface and the outer surface of the pot 1 composed of the cooking utensil body 2 and the bottom members 6 and 11. Is provided.

Next, a method of manufacturing the pot 1 will be described. First, the outline of the manufacturing method will be described. The cooking utensil body 2 made of a non-magnetic metal material, the first bottom surface member 6 made of a non-magnetic metal material, and the second bottom surface member 11 made of a magnetic metal material are separately molded for each material. This molding is basically performed by pressing. Particularly, the cooking utensil body 2 having a bottomed cylindrical shape is formed by drawing.

After the cooking utensil main body 2 and the bottom members 6, 11 are formed, the cooking utensil main body 2 and the bottom members 6, 11 are welded to each other and joined. This joining is performed by brazing (brazing). At the time of this brazing, first horizontal
The second bottom member 11 is disposed on the outer bottom surface of the first bottom member 6. At this time, powder of brazing material is added between the cooking utensil main body 2 and the first bottom member 6 and between the first bottom member 6 and the second bottom member 11. In this state, the second bottom member 11, the first bottom member 6, and the bottom of the cooking utensil main body 2 are externally heated. Thereby, the first bottom member 6 made of aluminum having a low melting point is formed.
Then, the brazing material once becomes a molten state, penetrates between the cooking utensil main body 2 and the first bottom surface member 6 and between the first bottom surface member 6 and the second bottom surface member 11, and fills the gap. Thereafter, when the cooking utensil body 2 and the bottom members 6 and 11 cool down, the once melted aluminum and brazing material solidify, whereby the cooking utensil body 2, the first bottom member 6 and the second bottom member 11 are separated. Joined together. Then, as is clear from the above description, the joining of the three members of the cooking utensil main body 2, the first bottom surface member 6, and the second bottom surface member 11 is performed simultaneously.

Thereafter, the inner and outer surfaces of the pot 1 are coated with an enamel, a fluorine-based resin or a silicon-based resin to form a coating of the non-adhesive layer 16. Further, the pot 1 is completed by performing finishing processing.

Next, the manufacturing method will be described in more detail.
In the molding process of the cooking utensil main body 2, first, a blank is drawn by a press machine. Then, it is formed into a shape closer to the product shape by a press machine. Next, after performing trimming by a press machine, cleaning is performed. The cooking utensil body 2 thus formed is subjected to a brazing process.

In the molding of the first bottom member 6,
First, piercing of a guide hole is performed by a press machine. Next, the central projection 9 is embossed by a press machine. Next, the peripheral edge 7 is embossed by a press machine. Next, trimming is performed by a press machine, and further, after performing cutting, cleaning is performed. The first bottom surface member 6 thus formed is subjected to a brazing process.

In the molding of the second bottom member 11,
First, piercing of the hole 12 is performed by a press machine. Next, after performing trimming by a press machine, cleaning is performed. The second bottom member 11 thus formed is subjected to a brazing process.

In the brazing step, the cooking utensil body 2, the first bottom member 6, and the second bottom member 11 are simultaneously joined as described above.

After this brazing step, the bottom is pushed by a press machine. As a result, the bottom of the pot 1 is formed into a gentle curved shape in which the center bulges slightly higher than the periphery. Next, the first bottom member 6 is placed on the bottom of the pan 1.
The position corresponding to the outer peripheral portion 1a is cut. Note that FIG.
, The chain line shows the state before cutting, and the solid line shows the state after cutting. Next, a coating of the non-adhesive layer 16 is formed on the inner and outer surfaces of the pot 1 by enamel coating, fluorine resin coating or silicon resin coating. Next, on the bottom surface of the pot 1, on the outer peripheral side of the first bottom member 6, the bottom 1
Cut the position corresponding to b. In FIG. 2, a chain line shows a state before cutting, and a solid line shows a state after cutting.
Next, the end face 1c of the flange 3 of the cooking utensil main body 2 is cut. Further, the outer bottom surface of the second bottom member 11 made of stainless steel is polished. This polishing is performed manually using a polishing machine.

In the pot 1 of the first embodiment, the second bottom member 11 made of stainless steel of a magnetic metal material is provided at the bottom, so that the electromagnetic induction heating can be performed. On the other hand, most of the pot 1 other than the second bottom member 11 is made of aluminum, so that it can be reduced in weight and, because of the excellent thermal conductivity of aluminum, good cooking can be performed. Moreover, the thickness of the cooking utensil main body 2 formed by pressing, especially by drawing, becomes basically uniform,
Since the first bottom member 6 made of aluminum is interposed between the outer bottom surface of the cooking utensil main body 2 and the second bottom member 11, the bottom portion of the pan 1 can be thicker than other portions such as the side portions. . In addition, waste of material can be reduced as compared with the case where the material thickness is adjusted by cutting. In addition, since the bottom portion of the pot 1 is thickened, uneven heating can be suppressed even when cooking with direct heat. Therefore, the object to be cooked can be prevented from being scorched due to excessive local heating, good cooking can be performed, and the non-adhesive layer 16 made of a fluorine-based resin coating or the like is peeled off or the pot 1 is deformed. Can also be suppressed. In addition, the non-adhesive layer 16 can suppress the adherence of the object to be cooked and dirt, particularly, the scorching.

In the manufacture of the pot 1, the cooking utensil body 2 made of a non-magnetic metal material, the first bottom member 6 made of a non-magnetic metal material, and the second bottom member 11 made of a magnetic metal material are combined with each other. After separately forming each of the cooking utensils 2, the first bottom surface member 6 and the second bottom surface member 11 are welded together by brazing and joined together, so that the cooking utensil main body 2 made of a non-magnetic metal material is used. A magnetic metal material is provided on the bottom surface of the pan 1, and the pan 1 having a thick bottom surface can be easily manufactured, and the manufacturing cost can be reduced. Further, the cost can be reduced as compared with the case where the clad material is used. The advantage of performing the forming process of each material first will be described in more detail. If the different materials are joined and then formed into a predetermined shape, the difference in extensibility of each material, or the workpiece When the material thickness is partially changed, the forming process becomes troublesome. However, if the forming process is performed for each material and the bottom members 6 and 11 are joined to the cooking utensil main body 2, the manufacturing can be easily performed. .

The cooking utensil body 2 and the first bottom member 6
And the second bottom member 11 are welded by brazing, so that the cooking utensil body 2 made of aluminum, the first bottom member 6 made of aluminum, and the second bottom member 11 made of stainless steel can be easily and easily connected. Can be securely joined. That is, welding can join various materials such as aluminum and stainless steel. Further, since the molten aluminum or brazing material permeates into the joint between the cooking utensil main body 2, the first bottom member 6 and the second bottom member 11,
It is possible to suppress air from being sealed in this joint. Therefore, the problem that the enclosed air expands during heating and cooking and the pan 1 is deformed or damaged can be solved.

Furthermore, it is not essential to fit the second bottom member 11 into the recess 8 formed in the first bottom member 6, but this improves the stability of the position of the first bottom member 6. I do.

Next, a second embodiment of the present invention will be described with reference to FIG. The description of the same parts as in the first embodiment is omitted. The cooking utensil of the second embodiment is also a pot 21. The pan 21 includes a cooking utensil body 22 made of nonmagnetic metal material such as aluminum or aluminum alloy (for example, 3003). The cooking utensil main body 22 has a bottomed cylindrical shape with an open upper surface.

A first bottom member 26 as an aluminum plate separate from the cooking utensil main body 22 is joined to the bottom surface (lower surface) outside the cooking utensil main body 22. This first
The bottom member 26 is made of nonmagnetic metal material such as aluminum or aluminum alloy (for example, 1050/3003). The first bottom surface member 26 has a substantially round plate shape.

Further, on the bottom surface (lower surface) outside the cooking utensil body 22, the first bottom surface member 26 is covered so as to be separate from the first bottom surface member 26 and the cooking utensil body 22. A capsule-shaped second bottom surface member 27, which is a plate material, is joined. The second bottom surface member 27 is made of a magnetic stainless material (for example, SUS430) such as a ferrite stainless steel which is a magnetic metal material. The second bottom member 27 has a shallow bottomed cylindrical shape with an open upper surface.
The first bottom surface member 26 is fitted in the second bottom surface member 27. Side wall portions 28 around the second bottom surface member 27 are:
The bottom of the cookware main body 22 is hit.

Further, a non-adhesive layer (coating) 29 made of enamel coating, fluorine resin coating, or silicone resin coating is applied to the entire surface, that is, the inner surface and the outer surface of the pot 21 composed of the cooking utensil body 22 and the bottom members 26, 27. Is provided.

In order to manufacture the pot 21, first, the cooking utensil body 22 made of a non-magnetic metal material, a first bottom member 26 made of a non-magnetic metal material, and a second bottom member 27 made of a magnetic metal material are used. Is molded separately for each material.
This molding is basically performed by pressing. In particular, the cooking utensil body 22 having a bottomed cylindrical shape is formed by drawing.

Then, the cooking utensil main body 22 and the bottom member 2
After the moldings 6 and 27 are formed, the cooking utensil main body 22 and the bottom members 26 and 27 are welded and joined to each other. This joining is performed by brazing (brazing). In this brazing, the first bottom member 26 is arranged on the outer bottom surface of the cooking utensil main body 22, and the first bottom member 26 is covered. Then, the second bottom surface member 27 is arranged. At that time, brazing powder is added between the cooking utensil main body 22 and the first bottom surface member 26 and between the first bottom surface member 26 and the second bottom surface member 27. In this state, the second bottom member 27, the first bottom member 26, and the bottom of the cooking utensil main body 22 are externally heated. Thereby, the first material made of aluminum having a low melting point
Once the bottom member 26 and brazing material are in a molten state,
It penetrates between the cooking utensil main body 22 and the first bottom surface member 26 and between the first bottom surface member 26 and the second bottom surface member 27 and fills the gap. Thereafter, the cooking utensil body 22 and the bottom member 26,
When the 27 cools, the once melted aluminum and brazing material solidify, thereby joining the cooking utensil body 22, the first bottom surface member 26, and the second bottom surface member 27 to each other.
And, as is clear from the above description, the cooking utensil body
22, the joining of the three members, the first bottom member 26 and the second bottom member 27, is performed simultaneously.

Thereafter, the inner and outer surfaces of the pot 21 are coated with an enamel, a fluorine resin or a silicon resin to form a coating of the non-adhesive layer 29. Further, the pot 21 is completed by performing finishing processing.

In the pot 21 of the second embodiment, the second bottom member 27 made of stainless steel of a magnetic metal material is provided at the bottom, so that the electromagnetic induction heating cooking can be performed. On the other hand, most of the pot 21 other than the second bottom member 27 is made of aluminum, so that it can be reduced in weight and, because of the excellent thermal conductivity of aluminum, can be cooked well. Moreover, while the thickness of the cooking utensil body 22 formed by pressing, especially by drawing, becomes basically uniform,
Since the first bottom member 26 made of aluminum is interposed between the outer bottom surface of the cooking utensil main body 22 and the second bottom member 27, the bottom portion of the pan 21 can be thicker than other portions such as the side portions. . In addition, waste of material can be reduced as compared with the case where the material thickness is adjusted by cutting. In addition, since the bottom portion of the pot 22 is thickened, uneven heating can be suppressed, even when cooking with direct heat. Therefore, it is possible to prevent the food from being scorched due to excessive local heating, to perform good cooking, to peel off the non-adhesive layer 29 made of a fluorine-based resin coating, or to deform the pot 21. Can also be suppressed. In addition, the non-adhesive layer 29 can suppress the adherence of the object to be cooked and dirt, particularly, the scorching.

In the manufacture of the pot 21, the cooking utensil body 22 made of a non-magnetic metal material, a first bottom member 26 made of a non-magnetic metal material, and a second bottom member 27 made of a magnetic metal material are combined with each other. After being separately molded for each, the cooking utensil body 22, the first bottom surface member 26, and the second bottom surface member 27 are welded together by brazing and simultaneously joined, so that the cooking utensil main body 22 made of a non-magnetic metal material is used. A magnetic metal material is provided on the bottom surface of the pan 21. Further, the pan 21 having a thick bottom surface can be easily manufactured, and the manufacturing cost can be reduced. Further, the cost can be reduced as compared with the case where the clad material is used.

The cooking utensil body 22 and the first bottom member 26
And the second bottom member 27 are welded by brazing, so that the cooking utensil body 22 made of aluminum, the first bottom member 26 made of aluminum, and the second bottom member 27 made of stainless steel can be easily and easily connected. Can be securely joined. That is, welding can join various materials such as aluminum and stainless steel. Further, since the molten aluminum or brazing material permeates into the joint between the cooking utensil main body 22, the first bottom member 26, and the second bottom member 27,
It is possible to suppress air from being sealed in this joint. Therefore, the enclosed air expands during heating and cooking.
The problem that the 21 is deformed or damaged can be solved.

Next, a third embodiment of the present invention will be described with reference to FIG. The description of the same parts as those in the first and second embodiments will be omitted. The cooking device of the third embodiment is also a pot 31. The pot 31 includes a cooking utensil main body 32 made of a nonmagnetic metal material such as aluminum or an aluminum alloy (for example, 3003). The cooking utensil main body 32 is in the shape of a bottomed cylinder with an open upper surface. In addition, the cooking utensil body 32
As in the outer bottom surface of the first bottom member 6 of the first embodiment, a protruding edge portion 33 is formed in a peripheral portion of the outer bottom surface (lower surface) of the first embodiment. It is 34. Although not shown, one or a plurality of convex portions may be formed in the concave portion. In addition, the cooking utensil body of the third embodiment.
The material thickness of 32 is slightly thicker, for example, at 3 mm. The depth of the recess 34 is, for example, 0.5 mm.

In the recess 34 of the cooking utensil main body 32, a bottom member 36 separate from the cooking utensil main body 32 is joined. The bottom member 36 is made of a magnetic stainless material (eg, SUS430) such as a ferrite stainless steel which is a magnetic metal material. Also, the bottom member 36 is
Although it has a substantially round plate shape having the same diameter as the concave portion 34 of the cooking utensil main body 32, if there is a convex portion in the concave portion 34, it has one or more holes into which the convex portion is fitted. become.

Further, the entire surface of the pot 31 comprising the cooking utensil body 32 and the bottom member 36, that is, the inner surface and the outer surface,
A non-adhesive layer (coating) 38 made of enamel coating, fluorine resin coating, or silicon resin coating is provided.

To manufacture the pot 31, the cooking utensil body 32 made of a non-magnetic metal material and the bottom member 36 made of a magnetic metal material are separately molded for each material. This molding is basically performed by pressing.
In particular, the cooking utensil body 32 having a bottomed cylindrical shape is formed by drawing.

Then, the cooking utensil main body 32 and the bottom member 36
Then, the cooking utensil main body 32 and the bottom member 36 are welded and joined to each other. This joining is performed by brazing (brazing). In this brazing, a bottom member 36 is arranged on the outer bottom surface of the cooking utensil main body 32.
At this time, a powder of brazing material is added between the cooking utensil main body 32 and the bottom member 36. In this state, the bottom surface member 26 and the bottom of the cooking utensil main body 32 are heated from the outside. As a result, the bottom and the brazing material of the cooking utensil body 32 made of aluminum having a low melting point temporarily become molten, penetrate between the cooking utensil main body 32 and the bottom member 36, and fill the gap. Thereafter, when the cooking utensil main body 32 and the bottom member 36 cool, the once melted aluminum and brazing material solidify, thereby joining the cooking utensil main body 32 and the bottom member 36 to each other.

After that, the inner and outer surfaces of the pot 31 are coated with an enamel, a fluorine-based resin, or a silicon-based resin to form a coating of the non-adhesive layer 38. Further, the pot 31 is completed by performing finishing processing.

In the pot 31 of the third embodiment, since there is a bottom member 36 made of stainless steel of a magnetic metal material at the bottom, electromagnetic induction heating cooking can be performed. On the other hand, most of the pot 31 other than the bottom member 36 is made of aluminum, so that it can be reduced in weight and, because of the excellent thermal conductivity of aluminum, good cooking can be performed. In addition, since the non-adhesive layer 38 is provided on the inner and outer surfaces of the pot 31, it is possible to suppress the adherence of foods and dirt, especially the burning.

In the manufacture of the pan 31, after the cooking utensil body 32 made of a non-magnetic metal material and the bottom member 36 made of a magnetic metal material are separately molded for each material,
Since the cooking utensil body 22 and the bottom member 36 are welded and joined by brazing, the pot 31 having the magnetic metal material provided on the bottom surface of the cooking utensil body 32 made of a non-magnetic metal material can be easily manufactured, and the manufacturing cost can be reduced. Can also be reduced.

Further, since the joining of the cooking utensil main body 32 and the bottom member 36 is welding by brazing, the cooking utensil main body 32 made of aluminum and the bottom member 36 made of stainless steel can be easily and reliably joined. That is, if it is welding,
Various materials such as aluminum and stainless steel can be joined. Further, since the molten aluminum or the brazing material permeates into the joint between the cooking utensil main body 32 and the bottom member 36, it is possible to prevent air from being sealed in this joint. Therefore, the problem that the pot 31 is deformed or damaged due to the expansion of the enclosed air during heating and cooking can be solved.

Further, it is not essential that the bottom member 36 be fitted into the concave portion 34 formed on the outer bottom surface of the instrument main body 32.
Thereby, the stability of the position of the bottom member 36 is improved.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
In the above embodiments, the material of the cooking utensil body is aluminum or an aluminum alloy. However, as the material of the cooking utensil body, various non-magnetic metal materials such as copper can be used. The same applies to the material of the bottom member made of a non-magnetic metal material. However, it is preferable that the material has good thermal conductivity. Further, the material of the bottom member made of a magnetic metal material is not limited to stainless steel.

Further, the shapes of the cooking utensil main body and the bottom member in the above embodiment are merely examples, and various modifications can be made.

Further, a cladding material of aluminum and stainless steel may be used as the bottom member, and the aluminum side of the cladding material may be welded to the bottom of the cooking utensil body made of aluminum.

In the above-described embodiment, the non-adhesive layer made of a fluororesin coating or the like is provided on the entire surface of the pan. A layer may be provided.

Further, although the description has been given by taking a pan as an example of the cooking utensil, the present invention can be applied to various cooking utensils such as frying pans other than the pan.

[0064]

According to the cooking device of the first aspect of the present invention, the cooking utensil body made of a non-magnetic metal material has
A non-magnetic metal material separate from the cooking utensil body
Since the second bottom member made of a magnetic metal material separate from the main body of the cooking utensil and the first bottom member is interposed with the bottom surface member of 1, the bottom portion of the cooking utensil can be removed without waste of material. It can be thicker than other portions such as the side portions, so that uneven heating can be suppressed even when heating and cooking is carried out particularly with an open fire, good cooking can be performed, and problems such as deformation of the cooking device can be suppressed.

According to the cooking device of the second aspect of the present invention,
Since a bottom member made of a magnetic metal material separate from the cooking utensil body was joined to the bottom portion of the cooking utensil body made of a non-magnetic metal material by welding, the cooking utensil body made of a non-magnetic metal material and the magnetic metal material were joined together. Can be easily and reliably joined to the bottom member made of, and it is possible to suppress the air from being sealed in the joint, so that problems such as deformation of cooking utensils due to expansion of the sealed air by heating are also encountered. Can be resolved.

According to the cooking device of the third aspect of the present invention,
A first bottom member made of a non-magnetic metal material separate from the cooking utensil body, and a separate bottom plate member made of the non-magnetic metal material and a first bottom member made of a non-magnetic metal material. And a second bottom surface member made of a magnetic metal material of
Since the joint with the bottom member of 1 is welded, the bottom part of the cooking utensil can be made thicker than other parts such as the side part without wasting material. It can suppress unevenness and make good cooking,
Problems such as deformation of the cooking device can also be suppressed. Also, by welding, the cooking utensil main body and the first bottom surface member can be easily and reliably joined together, various materials can be joined, and air can be suppressed from being sealed in the joining portion. Problems such as deformation of the cooking utensil due to expansion of the enclosed air by heating can be solved.

Further, according to the cooking device of the fourth aspect of the present invention, since the joining is performed by brazing, the joining of the cooking appliance main body and the bottom member can be easily and reliably performed, and the molten brazing material is used. Penetrates into the joint between the cooking utensil main body and the bottom member, so that it is possible to further suppress air from being sealed in this joint.

According to the cooking device of the sixth aspect of the present invention, since the non-adhesive layer is provided on the entire surface or a part thereof,
It is possible to suppress the adherence of the object to be cooked or dirt, especially the burning. In addition, when the non-adhesive layer is provided, unevenness of heating can be prevented as described above, so that problems such as peeling of the non-adhesive layer due to local excessive heating can be suppressed.

According to the method of manufacturing the cooking device of the invention, the non-magnetic metal material and the magnetic metal material separate from the non-magnetic metal material are molded and processed for each material.
On the bottom part of the cooking utensil body made of the non-magnetic metal material,
Since the bottom member made of the magnetic metal material is welded, a cooking device having a magnetic metal material provided on the bottom surface of the cooking utensil body made of a non-magnetic metal material can be easily manufactured, and the manufacturing cost can be reduced. In addition, by welding the bottom member to the cooking utensil body, the cooking utensil body made of a non-magnetic metal material and the bottom member made of a magnetic metal material can be easily and reliably joined together, and various materials can be joined, In addition, since air can be prevented from being sealed in the joint, problems such as deformation of the cooking utensil due to expansion of the sealed air by heating can be solved.

According to the method of manufacturing a heating cooker of the ninth aspect of the present invention, a magnetic stainless steel such as a ferritic stainless steel is formed by interposing an aluminum plate and a brazing material on the bottom surface of a cooking utensil body made of a non-magnetic metal material. A plate made of a material is arranged, and after the aluminum plate and the brazing material are once melted by heating from the outside, they are solidified to join the cooking utensil body and the plate, so that the non-magnetic metal material is used. A plate made of a magnetic stainless material can be easily and reliably joined together with an aluminum plate to the bottom of the cooking utensil body. In addition, the cooking utensil body,
Since air can be prevented from being sealed in the joint between the aluminum plate and the plate material, problems such as deformation of the cooking utensil due to expansion of the sealed air by heating can be solved. Furthermore, by interposing an aluminum plate between the cooking utensil main body and the plate material, the bottom portion of the cooking utensil can be made thicker than other portions such as side portions without wasting material.
This makes it possible to suppress uneven heating even when cooking by heating over an open flame, thereby achieving good cooking and suppressing problems such as deformation of the cooking device.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing a first embodiment of a heating cooking appliance of the present invention.

FIG. 2 is an enlarged view of a part of FIG.

FIG. 3 is a bottom view of the same.

FIG. 4 is an exploded cross-sectional view before bonding.

FIG. 5 is a sectional view showing a second embodiment of the cooking device according to the present invention.

FIG. 6 is a sectional view showing a third embodiment of the cooking device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pot (heating cooking appliance) 2 Cooking appliance main body 6 1st bottom surface member (aluminum plate) 11 2nd bottom surface member (plate material) 16 Non-adhesive layer 21 Pot (heating cooking appliance) 22 Cooking appliance main body 26 1st bottom surface Member (aluminum plate) 27 Second bottom member (plate material) 29 Non-adhesive layer 31 Pot (heating cookware) 32 Cookware body 36 Bottom member 38 Non-adhesive layer

Claims (9)

[Claims] A first bottom member made of a non-magnetic metal material separate from the cooking utensil main body is interposed on the bottom surface of the cooking utensil main body made of a non-magnetic metal material. A heating cooker comprising a second bottom member made of a magnetic metal material separate from the first bottom member. 2. A heating cookware comprising a bottom member made of a magnetic metal material separate from the cookware body and joined to a bottom surface of the cookware body made of a non-magnetic metal material by welding. . 3. A first bottom member made of a non-magnetic metal material separate from the cooking utensil main body, a bottom surface portion of the cooking utensil main body made of a non-magnetic metal material, and the cooking utensil main body and the first bottom surface. A heating cookware comprising a member and a second bottom member made of a separate magnetic metal material joined together, and at least the joint between the cooking unit body and the first bottom member is welded. . 4. The cooking appliance according to claim 2, wherein the joining is brazing. 5. The cooking according to claim 1, wherein the non-magnetic metal is aluminum, an aluminum alloy, or copper, and the non-magnetic metal is stainless steel. Appliances. 6. The heating cooking appliance according to claim 1, wherein a non-adhesive layer is provided on the entire surface or a part thereof. 7. The cooking device according to claim 6, wherein the non-adhesive layer is formed of an enamel coating, a fluorine resin coating or a silicon resin coating. 8. After forming a non-magnetic metal material and a magnetic metal material separate from the non-magnetic metal material for each material, the bottom surface of the cooking utensil body made of the non-magnetic metal material is A method of manufacturing a heating cooker, comprising welding a bottom member made of the magnetic metal material. 9. An aluminum plate and a brazing material are interposed on the bottom of a cooking utensil body made of a non-magnetic metal material,
After disposing a plate material made of a magnetic stainless material such as ferritic stainless steel and heating the aluminum plate and brazing material once by heating from the outside,
A method for manufacturing a heating cooker, comprising solidifying the above and joining the cookware main body and a plate material.