JP2001321269A - Method of manufacturing cooker for electromagnetic cooking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a heat generator from peeling off from the main body of a cooker by firmly mounting projections on the main body of the cooker such as a cooking pan. SOLUTION: The bottom of the main body 2 of the cooking pan is plastically deformed in spots to form plural projections 4, which project on the outer surface of the bottom of the cooking pan main body 2, corresponding to insertion holes 5 of a heat generator 3. The heat generator 3 is set on the outer surface of the bottom of the cooking pan main body 2 by inserting each projection 4 on the outer surface of the bottom of the cooking pan main body 2 into each corresponding insertion hole 5 of the heat generator 3 in such a way that the projection 4 projects from the insertion hole 5. By plastically deforming each projection 4 by pressing the tip of the projection 4, each insertion hole 5 is filled with the corresponding projection 4 and the tips of the projections 4 are on the same plane as the heat generator 3. Then the heat generator 3 is jointed integrally with the cooking pan main body 2 by way of the projections 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cooking utensil for electromagnetic cooking which is used when cooking using an electromagnetic induction heating (hereinafter, abbreviated as "IH") method.

[0002]

2. Description of the Related Art An IH cooking device, which heats and cooks a container such as a pot as an electromagnetic cooking utensil by the IH method, does not use a fire as a heating source, and therefore has higher safety than a gas stove or the like. In recent years, it has been rapidly spread because it has advantages such as the indoor air is not polluted by combustion of gas, and it has good thermal efficiency and energy saving.

As an electromagnetic cooking utensil used in such an IH cooker, a heating element made of a magnetic metal plate such as iron or magnetic stainless steel is integrally joined to an apparatus body made of a nonmagnetic material such as an aluminum alloy. There is a cooking appliance for electromagnetic cooking constituted by: As an example of the joining method, there is a technique disclosed in, for example, JP-A-61-33612. The technical contents will be described with reference to FIGS.

First, as shown in FIG. 17, a plurality of projections 101 are formed by welding a plurality of pin-shaped projection materials to the outer surface of the bottom of a pot body 102 made of a non-magnetic material. On the other hand, FIG.
(A) and FIG. 18 (b), a plurality of insertion holes 1
Heating element 1 made of a magnetic metal plate by punching 03
04 is formed.

Next, as shown in FIGS. 19 (a) and 19 (b), the pot body 102 is turned upside down, and the pot body 102 is held in a posture in which the bottom outer surface is directed upward. The heating element 104 is inserted into each of the insertion holes 103 by inserting the respective projections 101 on the bottom outer surface of the pot main body 102 into the pot main body 102.
Set on the bottom outer surface. Each of the insertion holes 103 is formed as a straight hole having the same diameter as a whole, and the tip of each of the projections 101 protrudes from each of the insertion holes 103 in a state where the heating element 104 is set on the outer surface of the bottom of the pot body 102. A gap 105 between each projection 101 and each insertion hole 103
Are formed.

[0006] Thereafter, as shown in FIG.
A plurality of protrusions 1 on the bottom outer surface of the pot body 102 on which the four are set
01, the lower receiving jig 107 constituting the caulking device 106 is made to correspond to the inner side of the
02, while being in contact with the inner surface of the bottom, the upper punch 108, which also constitutes the caulking device 106, is made to correspond to the projection 101 from above the outer surface of the bottom of the pot body 102.

[0007] Thereafter, FIGS. 21A and 21B
As shown in FIG. 5, the tip of the projection 101 is pressurized from above with a punch 108 to plastically deform the projection 101, thereby filling the insertion hole 103 (gap 105) with the projection 101 and moving the tip of the projection 101 from the heating element 104. By swelling, the swelling portion 109 is engaged around the insertion hole 103. This operation is performed on all the protrusions 101, and the heating element 104 is integrally joined to the outer surface of the bottom of the pot body 102 via the respective protrusions 101 by caulking, as shown in FIGS.
A pot 110 as a finished product as shown in FIG. 2 (b) is obtained.

[0008]

However, in the above publication, the projection material, which is a separate component from the pot body 102, is welded to the pot body 102 to form the projection 101. Since it has to be made separately from 102, the production cost and labor are required. When the pot body 102 and the projections 101 are made of a material that is easily oxidized such as an aluminum alloy, an oxide film is easily formed, and this oxide film is bonded to the pot body 102 and the projections 101 (projection material). Therefore, it is difficult to obtain a sufficient welding strength, and the bonding strength of the heating element 14 is reduced, so that the heating element 14 is easily peeled.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a projection which is firmly protruded from an appliance main body such as a pan main body so that a heating element does not peel off from the appliance main body. That is.

[0010]

In order to achieve the above object, the present invention is characterized in that the projection is not formed as a separate part from the tool main body, but is formed as a part by plastically deforming the tool main body. And

More specifically, the present invention is based on a method of manufacturing a cooking appliance for electromagnetic cooking in which a heating element made of a magnetic metal plate is integrally joined to an appliance body made of a non-magnetic material, and the following solution is provided. Take steps.

That is, according to the first aspect of the present invention, a plurality of insertion holes are formed in advance through the heating element, and a plurality of projections are formed by plastically deforming the appliance body in a spot manner. Projecting from the appliance body so as to correspond to the respective insertion holes, and then inserting the respective projections of the appliance body into the respective insertion holes of the heating element so as to project from the respective insertion holes, and inserting the heating element into the appliance body. Then, by pressing the tip of each projection and plastically deforming each projection, each insertion hole is filled with each projection and the tip of each projection is flush with the heating element. It is characterized by being integrally joined to the instrument body through the intermediary.

According to the first aspect of the present invention, each projection is formed by plastic deformation of the instrument body, and each projection and the instrument body are originally an integral body. As compared with the case where the projection is formed by welding to the main body, the production cost of the projection and the labor of the welding operation are not required, and the cost and labor are reduced.

Further, since each projection and the appliance body are originally an integral body, the problem of inhibition of projection bonding by the oxide film does not occur, and a strong bonding strength of the heating element can be obtained.

Further, since the tip of each projection is flush with the heating element, the heating element has no protrusion and the heating element joining surface side of the appliance is flat.

In addition, a concave portion is formed on the anti-projection forming surface of the instrument body by plastic deformation at the time of forming the protrusion. However, since each protrusion is plastically deformed so that the tip is flush with the heating element, the concave portion is formed. It is no longer crushed by its plastic deformation,
The anti-projection molding surface of the instrument body is also flat.

According to a second aspect of the present invention, in the first aspect of the present invention, a tapered surface that expands outward is formed on the inner peripheral edge of each insertion hole on the side opposite to the joining surface of the heating element with respect to the appliance body. It is characterized in that the tip of each projection is formed in a large diameter portion having a truncated cone shape following the tapered surface shape and engages with the tapered surface.

According to the above construction, the large-diameter portion at the tip of the projection engages with the tapered surface of the insertion hole to prevent the heating element from being detached, and the joining strength of the heating element to the appliance body. Is even stronger.

According to a third aspect of the present invention, on the basis of the above, a plurality of insertion holes are formed in advance through the heating element, and a plurality of projections are formed by plastically deforming the instrument body in a spot manner. Are protruded from the appliance body so as to correspond to the respective insertion holes of the heating element, and then each projection of the appliance body is inserted into each of the insertion holes of the heating element so as to protrude from each of the insertion holes. Is set in the instrument body, and then each of the projections is pressurized to deform each projection plastically, thereby filling each of the insertion holes with each projection and swelling each projection tip from the heating element to insert each. It is characterized in that it is hooked around the hole and the heating element is integrally joined to the appliance body via each projection.

According to the above configuration, in the invention according to claim 3, since the plastic deformation of the projection is small by an amount corresponding to the tip of each projection protruding from the heating element, the projection is formed on the anti-projection molding surface of the instrument body at the time of the projection molding. The degree of crushing of the concave portion caused by the deformation is small, and there is a possibility that the concave portion remains on the anti-projection forming surface of the device main body. Except for this, the same operation and effect as in claim 1 are obtained. Further, the swelling portion at the tip of each projection prevents the heating element from coming off, and the same operation and effect as in claim 2 can be obtained.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 to 7 show a method of manufacturing a pot 1 as an electromagnetic cooking utensil according to Embodiment 1 of the present invention. As shown in FIGS. 7 (a) and 7 (b), the pot 1 includes a pot body 2 as an instrument body made of a non-magnetic material such as an aluminum alloy, a copper alloy, and a magnesium alloy. The heating element 3 made of a magnetic metal plate such as iron and magnetic stainless steel is integrally joined over almost the entire area of the bottom outer surface.

First, as shown in FIG. 1, the pot main body 2 is brought into contact with a lower mold 12 constituting a projection forming device 11 such that the bottom outer surface of the pot main body 2 contacts the lower mold 12 as shown in FIG. Place. In this state, the upper mold 13 that constitutes the projection molding device 11 rises and stands by. A plurality of protrusion forming relief holes 14 are formed in the lower mold 12 so as to penetrate in the vertical direction. On the lower surface of the upper mold 13, a plurality of protrusion forming press pins 15 are formed. It is provided so as to correspond to the escape hole 14 of the lower mold 12.

Next, as shown in FIG.
3 is lowered to enter the inside of the pot body 2,
The bottom inner surface is pressed by each of the press pins 15 described above. As a result, the inner surface of the bottom of the pot body 2 pressed by each press pin 15 is plastically deformed in a spot-like manner and is pressed into each relief hole 14 of the lower mold 12, and a plurality of protrusions 4 are provided by the number of the press pins 15. The pot body 2 protrudes from the bottom outer surface. In addition, pot body 2
Each press pin 1 corresponding to each of the projections 4 is provided on the bottom inner surface.
A concave portion 4a, which is a trace of 5, is formed (see FIGS. 4A and 4B). The projecting positions of the projections 4 are laid out so as to correspond to the respective insertion holes 5 of the heating element 3 described below.

On the other hand, as shown in FIGS. 3A and 3B, a plurality of insertion holes 5 are formed in advance through the heating element 3 by punching or the like by the number of the protrusions 4. The anti-joining surface side of the heating element 3 with respect to the bottom outer surface of the pot main body 2 (FIG. 3B)
(Upper side), the inner peripheral edge of each insertion hole 5 is formed with a tapered surface 5a that expands outward.

Then, as shown in FIGS. 4 (a) and 4 (b), the pot body 2 is turned upside down, and the pot body 2 is held in a posture in which the bottom outer surface faces upward. Each of the projections 4 on the bottom outer surface of the pot main body 2 is inserted into each of the insertion holes 5 by a tapered surface 5a.
And the heating element 3 is set on the outer surface of the bottom of the pot body 2. In this set state, the tip of each of the projections 4 protrudes from each of the insertion holes 5, and a gap 6 is formed between each of the projections 4 and each of the insertion holes 5.

Thereafter, as shown in FIG. 5, the pot main body 2 on which the heating element 3 is set is turned upside down in a lower mold 17 constituting a press device 16, and the bottom outer surface of the pan main body 2 is oriented upward. Place on. In this state, the upper die 18 constituting the press device 16 is raised and is on standby.

Then, as shown in FIGS. 6 (a) and 6 (b), the upper die 18 is lowered to press the entire outer surface of the bottom of the pot body 2 at once. Each of the protrusions 4 is plastically deformed by applying pressure from above with a mold 18, thereby filling each of the insertion holes 5 (gap 6) with each of the protrusions 4. As a result, the tip of each projection 4 becomes the tapered surface 5 of each insertion hole 5.
The large diameter portion 4b is formed in a truncated conical large diameter portion 4b following the shape a and engages the tapered surface 5a, and the large diameter portion 4b at the tip of each projection 4 is flush with the heating element 3 without any step. The heating element 3 is integrally joined to the pot main body 2 via the respective projections 4 to obtain the pot 1 as a finished product as shown in FIGS. 7 (a) and 7 (b). Further, each of the recesses 4 a on the inner surface of the bottom of the pot main body 2 is not crushed by plastic deformation by the press device 16 and is no longer crushed.

As described above, in the first embodiment, each projection 4
Is formed by plastically deforming the bottom of the pot body 2 and is originally integral with the pot body 2, so that a projection material of another part is welded to the pot body 2 to form a projection as compared with a post-mounting case. Each projection 4 can be protruded from the bottom outer surface of the pot main body 2 without increasing the production cost and the labor of the welding operation, so that the cost and labor can be reduced.

Further, in the first embodiment, since each projection 4 and the pot body 2 are originally integrally formed, there is no problem that the oxide film inhibits the joining of the projections, and the heating element 3 is firmly attached to the bottom outer surface of the pot body 2. Can be joined.

Furthermore, in the first embodiment, the tapered surface 5a that expands outward is formed on the inner peripheral edge of each insertion hole 5 on the side opposite to the joining surface of the heating element 3 with respect to the pot body 2, so that the tapered surface is formed. Each projection 4 formed following the shape of the surface 5a
The large diameter portion 4b at the tip is engaged with the tapered surface 5a of each insertion hole 5 to prevent the heating element 3 from being detached, and the joining strength of the heating element 3 to the pot body 2 can be further increased.

In addition, in the first embodiment, since the tip of each projection 4 is flush with the heating element 3, the heating element 3, that is, the pot 1
Since the bottom outer surface has no protrusion and the bottom outer surface of the pot 1 can be flat, and the upper die 18 presses the entire bottom outer surface of the pot body 2, the flatness of the heating element 3 is improved and the pot body 2 The degree of adhesion with the bottom outer surface can be increased.

Furthermore, in the first embodiment, the pot body 2
A plurality of recesses 4a are formed on the inner surface of the bottom due to plastic deformation at the time of forming the projections. However, since each projection 4 is plastically deformed so that the tip is flush with the heating element 3, each of the recesses 4a is formed by The inner surface of the bottom portion of the pot body 2 can be made flat without being crushed by plastic deformation.

(Embodiment 2) FIGS. 8 to 14 show a pot 1 as an electromagnetic cooking utensil according to Embodiment 2 of the present invention.
The manufacturing method of is shown. As shown in FIGS. 14 (a) and 14 (b), the pot 1 includes a pot body 2 as a tool body made of a non-magnetic material such as an aluminum alloy, a copper alloy, and a magnesium alloy. The heating element 3 made of a magnetic metal plate such as iron and magnetic stainless steel is integrally joined over almost the entire area of the bottom outer surface.

First, as shown in FIG. 8, the pot main body 2 is brought into contact with the lower mold 12 constituting the projection forming device 11 so that the bottom outer surface of the pot main body 2 contacts the lower mold 12 as shown in FIG. Place. In this state, the upper mold 13 that constitutes the projection molding device 11 rises and stands by. A plurality of protrusion forming relief holes 14 are formed in the lower mold 12 so as to penetrate in the vertical direction. On the lower surface of the upper mold 13, a plurality of protrusion forming press pins 15 are formed. It is provided so as to correspond to the escape hole 14 of the lower mold 12.

Next, as shown in FIG.
3 is lowered to enter the inside of the pot body 2,
The bottom inner surface is pressed by each of the press pins 15 described above. As a result, the inner surface of the bottom of the pot body 2 pressed by each press pin 15 is plastically deformed in a spot-like manner and is pressed into each relief hole 14 of the lower mold 12, and a plurality of protrusions 4 are provided by the number of the press pins 15. The pot body 2 protrudes from the bottom outer surface. In addition, pot body 2
Each press pin 1 corresponding to each of the projections 4 is provided on the bottom inner surface.
A concave portion 4a, which is a trace of 5, is formed (FIG. 11A).
And FIG. 11 (b)). The projecting position of each projection 4 is
It is laid out so as to correspond to each of the insertion holes 5 of the heating element 3 described below.

On the other hand, as shown in FIGS. 10 (a) and 10 (b), a plurality of insertion holes 5 are formed in advance through the heating element 3 by the number of the protrusions 4 by punching or the like. Each insertion hole 5 of the heating element 3 is entirely formed as a straight hole having the same diameter, and does not have the tapered surface 5a as in the first embodiment.

Then, as shown in FIGS. 11 (a) and 11 (b), the pot body 2 is turned upside down.
The bottom outer surface is held in an upright position, and each projection 4 of the bottom outer surface of the pot body 2 is inserted into each of the insertion holes 5 of the heating element 3 to set the heating element 3 on the bottom outer surface of the pot body 2. In this set state, the tip of each of the projections 4 protrudes from each of the insertion holes 5, and a gap 6 is formed between each of the projections 4 and each of the insertion holes 5.

Thereafter, as shown in FIG.
The lower receiving jig 20 constituting the caulking device 19 is made to correspond to one of the plurality of protrusions 4 on the bottom outer surface of the pot body 2 on which the is set, from the inside of the pot body 2, and is brought into contact with the inner surface of the bottom of the pot body 2. The upper punch 21 also constituting the caulking device 19 is made to correspond to the projection 4 from above the outer surface of the bottom of the pot body 2.

Thereafter, as shown in FIGS. 13 (a) and 13 (b), the tip of the projection 4 is pressed from above with a punch 21 to plastically deform the projection 4, whereby the insertion hole 5 (gap 6) is formed. ) Is filled with the protrusion 4, and the tip of the protrusion 4 swells out of the heating element 3 so that the swelling portion 4 c engages around the insertion hole 5. This operation is performed on all the projections 4,
The heating element 3 is integrally joined to the bottom outer surface of the pot main body 2 via the respective projections 4 by caulking to obtain the pot 1 as a finished product as shown in FIGS. 14 (a) and 14 (b). In addition, pot body 2
Since the degree of deformation of the projections 4 by the caulking device 19 is smaller than the degree of deformation by the press device 16 of the first embodiment, the concave portions 4a on the bottom inner surface are not completely removed and remain as shallow holes. I have.

In order to make each of the recesses 4a shallower and less noticeable, as in a modification shown in FIG.
If the concave portion 4a is formed to be larger and shallower than the diameter of the protrusion 4, the concave portion 4a can be made further shallow by plastically deforming the protrusion 4 by a caulking device 19 as shown in FIG. For this purpose, the projection forming device 11
The diameter of the press pin 15 projecting from the lower surface of the upper mold 13 may be larger than the diameter of the projection 4 to be formed, that is, the diameter of the relief hole 14 of the lower mold 12. Note that the recess 4a may be left, but the periphery thereof may be scraped off to make it flat.

Therefore, in the second embodiment, since the tip of each projection 4 bulges out of the heating element 3 (outer bottom surface of the pot 1) due to caulking, the plastic deformation is small. The degree of crushing of the concave portion 4a formed by the deformation is small, and the concave portion 4a may remain on the inner surface of the bottom of the pot main body 2. However, other than this, the same operational effects as those of the first embodiment can be obtained.

That is, by forming each projection 4 by plastically deforming the bottom of the pot body 2, it is possible to reduce the cost and labor without increasing the production cost of the projection and the work of welding. Since the main body 2 is originally an integral body, the heating element 3 can be firmly bonded to the outer surface of the bottom of the pot body 2 without obstruction of projection bonding by an oxide film, and the bulging portion at the tip of each projection 4 generates heat. The effect of preventing the body 3 from falling off and further increasing the bonding strength of the heating element 3 to the pot body 2 can be obtained.

In the first and second embodiments, the case where the cooking utensil is the pan 1 has been described as an example. However, the present invention is not limited to this, and for example, as shown in FIGS. 16 (a) and 16 (b). Alternatively, the heating element 3 may be a heat-insulating plate 1 'integrally joined to one surface of a plate body 2' as an instrument body.
FIG. 16A shows the case according to the manufacturing method of the first embodiment, and FIG. 16B shows the case according to the manufacturing method of the second embodiment. The heating and heat retaining plate 1 'is interposed between the IH cooking device and the pan and used for heating, or the heating and heat retaining plate 1' is previously heated on the IH cooking device, and the heated heating and heat retaining plate 1 'is heated. The plate 1 'is lowered from the IH cooker, and a plate, a pot, a dish, etc. are placed on the plate 1' and used for heat retention. Further, the present invention can be applied to any other cooking utensils for electromagnetic cooking.

[0045]

As described above, according to the present invention, the projection is formed by plastically deforming the appliance body, and the projection is inserted into the insertion hole of the heating element and the tip thereof is crushed to thereby crush the heating element. And the apparatus main body are integrated, so that there is no need to manufacture a projection of a separate part and to work to weld the projection, thereby reducing costs and labor. In addition, when the projection material of another part is welded, there is no projection joining inhibition by the oxide film, and the heating element can be firmly joined to the appliance body.

[Brief description of the drawings]

FIG. 1 is a manufacturing process diagram showing a state in which a pot main body is placed on a lower mold of a projection forming device in a method of manufacturing a cooking appliance for electromagnetic cooking according to Embodiment 1 of the present invention.

FIG. 2 is a manufacturing process diagram showing a state in which a projection is formed on the bottom outer surface of the pot main body in the method of manufacturing the electromagnetic cooking utensil according to Embodiment 1 of the present invention.

FIG. 3 (a) is a plan view of a heating element used in the method for manufacturing a cooking appliance for electromagnetic cooking according to Embodiment 1 of the present invention,
(B) is sectional drawing in the AA line of (a).

FIG. 4A is a manufacturing process diagram showing a state in which a heating element is set on an outer surface of a bottom portion of a pot main body in the method of manufacturing the cooking utensil for electromagnetic cooking according to Embodiment 1 of the present invention, and FIG. FIG.

FIG. 5 is a manufacturing process diagram showing a state in which a pot main body on which a heating element is set is placed on a lower mold of a press device in the method of manufacturing a cooking utensil for electromagnetic cooking according to Embodiment 1 of the present invention. .

FIG. 6 (a) is a manufacturing process diagram showing a state in which the heating element is joined to the outer surface of the bottom of the pot main body by a press device in the method of manufacturing the cooking device for electromagnetic cooking according to Embodiment 1 of the present invention;
(B) is an enlarged view of a portion C in (a).

FIG. 7A is a cross-sectional view of a pot manufactured by the method for manufacturing a cooking device for electromagnetic cooking according to Embodiment 1 of the present invention, and FIG. 7B is a bottom view thereof.

FIG. 8 is a manufacturing process diagram showing a state in which a pot main body is placed on a lower mold of a projection forming device in a method of manufacturing a cooking appliance for electromagnetic cooking according to Embodiment 2 of the present invention.

FIG. 9 is a manufacturing process diagram showing a state in which projections are formed on the outer surface of the bottom of the pot body in the method of manufacturing the cooking utensil for electromagnetic cooking according to Embodiment 2 of the present invention.

FIG. 10 (a) is a plan view of a heating element used for a method of manufacturing a cooking appliance for electromagnetic cooking according to Embodiment 2 of the present invention,
(B) is sectional drawing in the DD line of (a).

FIG. 11 (a) is a manufacturing process diagram showing a state in which a heating element is set on an outer surface of a bottom portion of a pot main body in the method of manufacturing a cooking appliance for electromagnetic cooking according to Embodiment 2 of the present invention, and FIG. FIG.

FIG. 12 is a manufacturing process diagram showing a state in which a caulking device is made to correspond to a projection of a pot main body on which a heating element is set, in the method for manufacturing a cooking utensil for electromagnetic cooking according to Embodiment 2 of the present invention.

FIG. 13 (a) is a manufacturing process diagram showing a state in which a heating element is joined to an outer surface of a bottom portion of a pot body by a caulking device in a method of manufacturing a cooking appliance for electromagnetic cooking according to Embodiment 2 of the present invention;
(B) is an enlarged view of the F section of (a).

FIG. 14A is a cross-sectional view of a pot manufactured by the method for manufacturing a cooking utensil for electromagnetic cooking according to Embodiment 2 of the present invention, and FIG. 14B is a bottom view thereof.

FIG. 15 (a) is a modification example corresponding to FIG. 11 (b),
(B) is a modified example corresponding to FIG.

FIG. 16A is a cross-sectional view of a heating and heat retaining plate manufactured by the method for manufacturing a cooking utensil for electromagnetic cooking according to the first embodiment of the present invention, and FIG. 16B is a cross-sectional view of a second embodiment of the present invention. It is sectional drawing of the heat insulation plate manufactured by the manufacturing method of the cooking appliance for electromagnetic cooking.

FIG. 17 is a manufacturing process diagram showing a state in which a projection material is welded to an outer surface of a bottom portion of a pot body to form a projection in a conventional method of manufacturing a cooking appliance for electromagnetic cooking.

18A is a plan view of a heating element used in a method of manufacturing a conventional cooking device for electromagnetic cooking, and FIG. 18B is a GG of FIG.
It is sectional drawing in a line.

FIG. 19 (a) is a manufacturing process diagram showing a state in which a heating element is set on the outer surface of the bottom of a pot body in a method of manufacturing a cooking utensil for electromagnetic cooking according to a conventional example, and (b) is an enlarged view of a portion H in (a). FIG.

FIG. 20 is a manufacturing process diagram showing a state in which a caulking device is made to correspond to a projection of a pot body on which a heating element is set in a conventional method for manufacturing a cooking appliance for electromagnetic cooking.

FIG. 21 (a) is a manufacturing process diagram showing a state in which a heating element is joined to an outer surface of a bottom portion of a pot body by a caulking device in a method of manufacturing a cooking tool for electromagnetic cooking according to a conventional example, and (b) is I in FIG. It is a part enlarged view.

FIG. 22 (a) is a cross-sectional view of a pot manufactured by a conventional method for manufacturing a cooking utensil for electromagnetic cooking, and FIG. 22 (b) is a bottom view thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pot (cooking tool for electromagnetic cooking) 1 'Heating and heating plate (cooking tool for electromagnetic cooking) 2 Pot body (apparatus main body) 2' Plate main body (apparatus main body) 3 Heating element 4 Projection 4b Large diameter portion 5 Insertion hole 5a Taper surface

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Okamura 3-44-17-8 Nagatsuka, Asaminami-ku, Hiroshima-shi, Hiroshima F-term in Hiroshima Aluminum Industry Co., Ltd. 3K051 AD34 AD40 CD43 CD45 4B055 AA09 BA13 BA15 BA22 CA02 CB07 CB16 CB27 CC46 DA02 DB14 FA02 FB02 FB04 FB05 FB06 FC06 FC08 FE10

Claims (3)

[Claims] 1. A method for manufacturing an electromagnetic cooking utensil, wherein a heating element made of a magnetic metal plate is integrally joined to an apparatus body made of a non-magnetic material, wherein a plurality of insertion holes are passed through the heating element in advance. A plurality of projections are formed on the tool body so as to correspond to the respective insertion holes of the heating element by plastically deforming the tool body in a spot manner. By inserting each projection of the instrument body so as to protrude from each insertion hole, and setting the heating element in the instrument body, thereafter, by pressing the tip of each projection to plastically deform each projection, each of the insertion holes is formed. The method of manufacturing a cooking utensil for electromagnetic cooking, characterized in that the protrusions are filled with the projections, the tips of the projections are flush with the heating element, and the heating element is integrally joined to the appliance body via the projections. 2. The method for manufacturing a cooking appliance for electromagnetic cooking according to claim 1, wherein the inner peripheral edge of each insertion hole on the side opposite to the joining surface of the heating element with respect to the appliance main body has a tapered surface expanding outward. Wherein the tip of each projection is formed in a large diameter portion having a truncated cone shape following the tapered surface shape and engages with the tapered surface. 3. A method of manufacturing a cooking utensil for electromagnetic cooking in which a heating element made of a magnetic metal plate is integrally joined to an apparatus body made of a non-magnetic material, wherein a plurality of insertion holes are passed through the heating element in advance. A plurality of projections are formed on the tool body so as to correspond to the respective insertion holes of the heating element by plastically deforming the tool body in a spot manner. By inserting each projection of the instrument body so as to protrude from each insertion hole, and setting the heating element in the instrument body, thereafter, by pressing the tip of each projection to plastically deform each projection, each of the insertion holes is formed. Wherein each of the protrusions is filled with each of the protrusions, and each of the protrusions is bulged from the heating element so as to be hooked around each of the insertion holes, and the heating element is integrally joined to the appliance body through each of the protrusions. The method of manufacturing the device.