JPH09224825A - Production of electromagnet cooking ware having projecting part for positioning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to relatively easily form projecting parts for positioning which are engageable with the engaging parts of an electromagnet cooking machine by a process for producing the electromagnet cooking ware by joining a ware body and a planar hating element. SOLUTION: The planar heating element 2 consisting of a magnetic material is joined to part of the ware body 1. At the time of joining, the heating element 2 is provided with through-parts 3 penetrating in the thickness direction thereof and the parts corresponding to the through-parts 3 of a metal mold 5 pressed to the heating element 2 are provided with grooves 7a, 7b. The heating element 2 and the ware body 1 are successively placed on the metal mold 6 and are pressurized toward the metal mold 6 from the ware body 1. The material constituting the ware body 1 is thereby plastically deformed and is passed through the through-parts 3 disposed at the heating element 2 and is packed into the grooves 7a, 7b formed at the metal mold 6, by which the projecting parts 8a, 8b for positioning projected from the heating element 2 are formed simultaneously with joining of the heating element 2 and the ware body 1.

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 an electromagnetic cooking utensil such as a pot and a frying pan used in an electromagnetic cooking machine, and in particular, an electromagnetic cooking utensil having a protrusion for positioning with respect to the electromagnetic cooking machine at the bottom. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Items used in an electromagnetic cooker are required to be made of a magnetic material that can be heated by electromagnetic induction. However, since the magnetic material is relatively expensive and heavy, it is not common to construct the entire container with the magnetic material. Therefore, a cooking utensil having a heating element made of a magnetic material is used only in a portion corresponding to a magnetic field generating coil of an electromagnetic cooker.

In such an electromagnetic cooking device having a heating element as a part, sufficient induction heating is not performed if the coil of the electromagnetic cooking device and the heating element of the cooking device are displaced from each other. Must always be placed in the position. Therefore, various methods have been proposed for determining the position of the electromagnetic cooker and the cooking utensil. For example, a method is possible in which a groove is provided in the electromagnetic cooker, a protrusion is provided at the bottom of the cooking utensil, and they are engaged with each other.

However, in order to manufacture a cooking utensil having a heating element having a sufficient thickness and having a protrusion for engaging and positioning at the bottom, there are cost and technical difficulties such as an increase in the number of steps. .

That is, in the case of a method of manufacturing a container body having a projecting portion at the bottom by, for example, die casting and then spraying a magnetic material serving as a heating element on the bottom thereof, the projecting portion for engaging and positioning is relatively easy. Can be formed,
In thermal spraying, it is difficult to apply a thick magnetic material, and it is difficult to form a heating element that can sufficiently perform heating by electromagnetic induction, which is unsuitable as an electromagnetic cooking utensil. Further, in the case of manufacturing a cooking utensil by joining a plate-shaped heating element and an instrument body, it is possible to secure a heating element having a sufficient thickness for induction heating, but after forming a protrusion on the instrument body. However, it is difficult to join the plate-shaped heating element, and the number of steps is increased when the protrusion is provided after joining the container body and the heating element.

The present invention has been made in view of the above technical problems, and is a method of manufacturing an electromagnetic cooking utensil by joining a utensil main body and a plate-shaped heating element, but the electromagnetic cooker is engaged. An object of the present invention is to provide a manufacturing method capable of relatively easily forming a positioning protrusion that can be engaged with a portion.

[0007]

In order to achieve the above object, in the method of manufacturing an electromagnetic cooking device according to the present invention, a plate-shaped heating element made of a magnetic material is joined to a part of the object body. A method for manufacturing an electromagnetic cooking utensil having a positioning protrusion on the bottom, wherein the heating element is provided with a penetrating portion penetrating in the thickness direction, and the penetrating of a mold abutting the heating element is provided. A groove is provided in a portion corresponding to the part, the heating element and the article body are sequentially placed on the mold, and the material constituting the article body is plastically deformed by pressing from the article body in the direction of the die. By passing through the penetrating portion provided in the heating element and filling the groove provided in the mold, a positioning protrusion protruding from the heating element is formed at the same time when the heating element and the object body are joined. It is what

According to this method, the protrusion for engaging and positioning can be formed relatively easily at the same time when the main body of the cooking utensil and the heating element are joined, so that the electromagnetic cooking utensil can be manufactured without increasing the number of steps. Therefore, increase in manufacturing cost can be suppressed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described.

First, in manufacturing electromagnetic cooking utensils,
Prepare the container body (1) and the heating element (2).

The material of the body (1) is not particularly limited, but since it is a cooking utensil, it is preferable to select 1000 series or 3000 series aluminum in consideration of thermal conductivity, corrosion resistance, workability and the like. . In this specification, the term aluminum is used to include its alloy.

Further, the shape of the container main body (1) to be joined can be arbitrarily selected by the pressing method at the time of joining, which will be described later. For example, if the pressing method is a rolling method, a plate shape before forming into a container shape is suitable, and if it is a forging method, it may be in a plate shape or after forming into a container shape.

The heating element (2) must be a magnetic material that generates heat by induction heating. In particular, in the case of the present invention, since it is applied to cooking utensils, iron-based materials are preferable in consideration of corrosion resistance and workability, and among them, SUS430 and SUS405.
Magnetic SUS materials such as Further, a clad material obtained by sandwiching an iron-based material such as SS41 with a magnetic SUS plate, or an aluminized steel plate obtained by immersing a steel plate in an aluminum solution to give the steel plate corrosion resistance may be used.

Next, the heating element (2) is formed into a plate shape having an arbitrary shape such as a circle, and the heating element (2) is provided with a penetrating portion (3). As will be described later, the penetrating part (3) plastically deforms the container body (1) to pass through the penetrating part (3) at the time of joining the container body (1) and the heating element (2) to generate heat. This is for forming a positioning protrusion (8) by protruding from the lower end of the body (2). Therefore, the penetrating portion (3) may be a hole-shaped one or a notched one as long as it can pass the plastically deformed container body (1). Also, the number should be at least one,
The shape is also not particularly limited, but the shape and number of the penetrating portion (3) are set so that the penetrating portion (3) can be engaged with the positioning engaging protrusion or engaging recess provided on the upper surface of the electromagnetic cooker. There is a need. In this embodiment, as shown in FIG. 2, four short-length communication in which four hole-shaped penetrating portions (3) having a circular arc shape in plan view are equally distributed inside the peripheral portion of the heating element (2). Division (4)
It is arranged in a ring through. By thus arranging the penetrating portion (3) in a ring shape, the flow of the induced current generated in the heating element (2) when the electromagnetic cooker is used can be prevented as much as possible.

Further, a large number of pot-shaped bite holes (5) are provided on the joint surface of the heating element (2). The bite hole (5) is a hole having at least one cross-sectional area larger than the area of the opening when the hole is virtually cut out in a cross section parallel to the opening. The bite hole (5) exhibits an anchor effect when the material forming the body (1) is filled in a retaining state when the body (1) and the heating element (2) are joined together, This contributes to the improvement of the joint strength between the container body (1) and the heating element (2).

The means for providing the penetrating part (3) and the bite hole (5) in the heating element (2) is not particularly limited, but the penetrating part (3) can be formed by punching or laser processing, and Since the bite hole (5) naturally becomes a vase shape and can be processed at high speed, processing by irradiation with an electron beam is suitable.

Next, the article body (1) and the heating element (2) are joined to form a positioning protrusion (8) at the same time.

For joining, as shown in FIG. 1 (a), a mold (6) is used, and a heating element (2) and an instrument body (1) are placed in this order on the processed surface of the mold (6). To do. At this time, the heating element (2) is arranged so that the surface of the heating element (2) in which the bite hole (5) is provided and the article body (1) are in contact with each other.

On the processed surface of the die (6), an annular groove (7a) having a predetermined depth is formed at a position corresponding to the penetrating portion (3) of the heating element (2). Furthermore, the heating element (2)
The annular groove (7b) is also provided at a position corresponding to the outside of the peripheral edge of the
Are formed.

Next, the container main body (1) and the heating element (2) mounted as described above are pressurized. Pressurization is performed from the container body (1) toward the heating element (2) as shown by the arrow (A) in FIG. A rolling method, a forging method, or the like can be adopted as a pressing method, but in particular, the forging method can press only a portion necessary for joining and forming the protruding portion (8), and moreover, the object body (1) is an object. It is preferable because pressure can be applied even in a state of being shaped. Furthermore, the pressurization may be performed cold or hot. Especially the body of the item (1)
It is preferable to adopt aluminum as the material of (1) and join it by a hot forging method because the deformation resistance of aluminum can be reduced and the energy consumed during forging can be reduced. In this case, the preferred heating temperature for aluminum is 150
３５０350 ° C.

Through the pressing step, the heating element penetration portion (3)
1 and the outer peripheral portion of the heating element (2), the container body (1) is plastically deformed, and the plastically deformed material passes through the penetrating part (3) as shown in FIG. Alternatively, the groove (7) of the mold (6) is passed over the lower end of the wall thickness of the heating element (2).
The protrusions (8a) and (8b) are formed by filling the a) and (7b) and matching the shapes of the grooves (7a) and (7b). Therefore, as shown in FIG. 3, the protrusions (8a) and (8b) are formed in the shape of two inner and outer rings.

Further, by the pressurizing step, at the same time, the dish main body (1) is inserted into the bite hole (5) provided in the heating element (2).
The material of (1) bites into the filled state, and the container body (1) and the heating element (2) are joined. As a result, an anchor effect is produced, and the joint between the body (1) and the heating element (2) is strengthened. Moreover, since the material of the container body (1) is also filled into the penetrating portion (3) and bites into it, a stronger joint is achieved due to the synergistic effect with the biting hole (5).

By the steps as described above, an electromagnetic cooking utensil having a heating element (2) at the bottom for generating heat by induction heating and having projecting portions (8a) (8b) for positioning with an electromagnetic cooking machine is obtained. It can be manufactured.

When using the electromagnetic cooking utensil produced in this way, the inner and outer ring-shaped protrusions (8a) on the bottom of the utensil
As shown in FIG. 4, (8b) is fitted and positioned so as to sandwich the annular engagement protrusion (11) on the electromagnetic cooker (10) side. Therefore, the electromagnetic cooker (10)
The heating element (2) always faces the optimum position with respect to the coil (12) provided in the.

In the above embodiment, the heating element (2) is used.
Although the case where the hole-shaped penetrating portion (3) is annularly arranged in the vicinity of the periphery is shown, it depends on the shape and position of the engaging portion on the electromagnetic cooker side, but as shown in FIG. A penetrating part (3) composed of a plurality of circular holes may be formed in the vicinity of the peripheral edge of the heating element (2), or a peripheral part notched penetrating part (3) is provided as shown in FIG. Alternatively, a penetrating part (3) consisting of one circular hole may be formed in the central part of the heating element (2), and in any case, a projection for positioning is formed at a corresponding part of the penetrating part (3). Parts can be formed.

[0026]

As described above, according to the present invention, since the protrusion for positioning can be formed at the same time when the heating element and the article body are joined together, the plate-shaped heating element is joined to the article body. Although it is an electromagnetic cooking device to be formed, it is possible to easily form the positioning protrusion while suppressing the manufacturing cost without increasing the number of steps. Further, since the heating element is provided with a penetrating portion through which the plastically deformed material of the body of the article passes, the air existing between the body of the article and the heating element is easily released at the time of joining, and pressure joining can be performed with relatively low energy. Therefore, the energy cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a manufacturing process of an electromagnetic cooking utensil according to an embodiment of the present invention.
FIG. 4B is a cross-sectional view before the pressure-bonding of the container body and the heating element, (B) during the pressure-bonding, and (C) after the pressure-bonding.

2A and 2B are diagrams showing an embodiment of a heating element, in which FIG. 2A is a plan view seen from the joint surface, FIG. 2B is a vertical sectional view, and FIG. 2C is an enlarged vertical sectional view for explaining a bite hole. It is a figure.

FIG. 3 is a diagram schematically showing an example of an electromagnetic cooking utensil manufactured according to the present invention, in which (a) is a longitudinal sectional view,
(B) is a bottom view.

FIG. 4 is a vertical cross-sectional view schematically showing a state in which the electromagnetic cooking utensil manufactured according to the present invention is placed on the electromagnetic cooking machine in an engaged state.

5 (a), (b), and (c) are plan views schematically showing other examples of the shape of the heating element.

[Explanation of symbols]

 1 ... Instrument main body 2 ... Heating element 3 ... Penetration part 5 ... Penetration hole 6 ... Mold 7 (7a, 7b) ... Groove 8 (8a, 8b) ... Projection part

Claims (1)

[Claims] 1. A method for manufacturing an electromagnetic cooking utensil having a plate-shaped heating element (2) made of a magnetic material joined to a part of the utensil body (1) and having a positioning protrusion on the bottom. The heating element (2) is provided with a penetrating portion (3) penetrating in the thickness direction and corresponds to the penetrating portion (3) of the mold (6) which is in contact with the heating element (2). A groove (7) is provided in a part, and a heating element (2) and an article body (1) are provided in the mold (6).
Are sequentially placed, and the material constituting the article body (1) is plastically deformed by applying pressure from the article body (1) in the direction of the mold (6). The groove (7) passing through the penetrating portion (3) and provided in the mold (6)
A positioning protrusion (8) protruding from the heating element (2) at the same time when the heating element (2) and the article body (1) are joined. A method for manufacturing an electromagnetic cooking device having the same.