JP4029065B2 - Electromagnetic induction heating pan and method for manufacturing the pan - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an electromagnetic induction heating pan such as a rice cooking pan of an electromagnetic induction heating rice cooker or a cooking pan used in an electromagnetic cooker.

  Conventionally, a clad pan in which austenitic stainless steel or the like, which is a magnetic material, is combined with aluminum or the like having good thermal conductivity is used for a pan or the like of this type of cooking utensil (for example, see Patent Document 1).

  In addition, a bottom member made of a non-magnetic material such as aluminum and a bottom member made of a laminated material in which a magnetic material is provided outside the non-magnetic material are separately manufactured, and the non-magnetic materials are butt-welded to each other to form a bottom portion. A container that only generates heat by induction heating is also known (see, for example, Patent Document 2).

  However, in Patent Document 1, the entire outer surface of the clad pan is formed of a magnetic material, and in an ordinary electromagnetic induction heating rice cooker or an electromagnetic cooker, induction heating is performed only from the bottom to the corner of the pan. Despite the fact that the heating coil is arranged, the magnetic material is also provided in the part that is not heated, so the cost is high, and the heat capacity of the magnetic material that is not heated is lost as heat loss, resulting in poor thermal efficiency It was.

In Patent Document 2, since the magnetic material is formed only at the bottom of the container, the thermal conductivity can be improved. However, it is necessary to manufacture the body and the bottom separately and perform butt welding. There is a problem that it takes time and labor to manufacture the container.
JP-A-8-96946 JP-A-7-327833

  Then, this invention makes it a 1st subject to provide the pan for electromagnetic induction heating with a favorable heating efficiency and a low-cost and easy process. Moreover, let it be the 2nd subject to provide the manufacturing method which can manufacture the said pan for electromagnetic induction heating easily.

In order to solve the first problem, the present invention provides an electromagnetic induction heating pan formed by pressing a clad material formed by bonding a nonmagnetic material and a magnetic material via an intermediate metal material. partially provided corresponding Rutotomoni provided partially of magnetic material on site necessary for induction heating, the intermediate metallic material at a site provided with the magnetic material, the magnetic material from the bottom, a bottom portion and side portions Adopted a configuration that provided up to the end of the side of the side of the corner that connects .

  With this configuration, since the magnetic material is provided only in a portion necessary for induction heating, the material cost can be reduced, and a pan having no heat loss and high heating efficiency can be provided.

Further, since the intermediate metal provided with said partially in response to the site in which a magnetic material, Ru can be further reduced material cost.

Furthermore, from the magnetic material base, since there is provided to the side surface portion side end portion of the corner portion connecting the bottom portion and side portions, the pan can not be formed by a simple mechanical press working originally only simple vertical pressing, moreover Ru can be processed without damaging the surface type for processing.

  In order to solve the second problem, the present invention punches a non-magnetic material into a disk shape having a desired size and a magnetic material into a disk shape having a size A1 necessary for induction heating. An intermediate metal material is formed on one surface of the magnetic material by plating or the like on the part to which the magnetic material is to be joined, while an intermediate metal material is formed on the entire surface of one surface of the magnetic material by plating or the like and reduced in pressure in a reduced pressure chamber below atmospheric pressure. A convex surface in which a non-magnetic material and a magnetic material are opposed to each other so that an intermediate metal material is in contact with each other and pressed and heated to join, and a bottom surface portion has an inner diameter A2 that is substantially the same as A1. A method for manufacturing an electromagnetic induction heating pan that was set between a mold and a concave mold and pressed with a predetermined pressing pressure was adopted.

  According to the present invention, since the magnetic material is disposed only in the portion necessary for induction heating, it is possible to provide an electromagnetic induction heating pan that has good heating efficiency and can reduce costs. Moreover, there exists an effect that it can form by simple press work.

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

  FIG. 1 shows an electromagnetic induction heating pan 1 according to the present invention. As for this pan 1, the inner surface side consists of nonmagnetic metals 2 (for example, aluminum). And among the outer surface side, the magnetic metal 3 (for example, austenitic stainless steel) is provided from the bottom part 1a to the corner part 1b. Further, an intermediate metal 4 (for example, copper plating) is provided between the non-magnetic metal 2 and the magnetic metal 3 to firmly join them. Usually, the thickness of the nonmagnetic metal 2 is about 1.2 to 3 mm, the magnetic metal 3 is about 0.5 mm, and the intermediate metal 4 is about 10 μm. The magnetic metal 3 and the intermediate metal 4 are provided in the corner portion 1b of the pan 1 up to the terminal portion 1d on the body portion 1c side.

The pan 1 is manufactured as follows.
That is, as shown in FIG. 2, first of all, the nonmagnetic metal 2 is punched into a size necessary for forming a pan, and the magnetic metal 3 is punched into a disk shape having a size A1 necessary for induction heating. An intermediate metal 4 is formed by plating or the like on a portion of one surface of the nonmagnetic metal 2 where the magnetic metal is to be joined. In addition, an intermediate metal 4 is formed on the entire surface of the magnetic metal 3 by plating or the like (see FIG. 2A). Then, the nonmagnetic metal 2 and the magnetic metal 3 are pressed and heated so that the intermediate metal 4 is in contact with each other in a decompression tank depressurized to the atmospheric pressure or lower, and the two are joined (see FIG. 2B). ). And the board | plate material formed in this way is set between the convex surface type | mold 5 and the concave surface type | mold 6, and it presses with a predetermined press pressure, and is set as a pan shape (refer FIG.2 (c)). At this time, the inner diameter A2 of the concave mold 6 corresponds to the size A of the end portion 1d of the body 1c side of the corner portion 1b of the pan 1, but if the A1 is set to be substantially the same diameter as A2, press working However, the convex mold 5 and the concave mold 6 are not damaged. The pan 1 manufactured in this way can be used for an electromagnetic induction heating rice cooker, an electromagnetic cooker, or an ordinary gas stove.

The present invention is not limited to the above embodiment.
For example, in the above embodiment, the intermediate metal 4 is formed only at the location where the magnetic metal 3 is provided, but it may be provided on the entire surface of one side of the nonmagnetic metal 2 to improve the appearance and heat conductivity. Further, as shown in FIG. 3, the portion where the magnetic metal 3 is provided may be provided partially corresponding to the shape and arrangement of the heating coil 5.

It is sectional drawing of the pan for electromagnetic induction heating which concerns on this embodiment. It is the schematic which shows the manufacturing method of a pan. It is sectional drawing of the pan for electromagnetic induction heating which concerns on other embodiment of this invention.

Explanation of symbols

1 ... pan, 2 ... nonmagnetic metal, 3 ... magnetic metal, 4 ... intermediate metal.

Claims (2)

In the electromagnetic induction heating pot a clad material formed by joining a non-magnetic material via an intermediate metallic material and a magnetic material formed by press working, Ru partially formed in the site necessary for induction heating at least the magnetic material In addition, the intermediate metal material is partially provided corresponding to the portion where the magnetic material is provided, and the magnetic material is provided from the bottom portion to the side surface side end portion of the corner portion connecting the bottom portion and the side surface portion. Features an electromagnetic induction heating pan.   A non-magnetic material is punched into a disk having a desired size, and the magnetic material is punched into a disk having a size A1 required for induction heating, and an intermediate metal material is bonded to a portion of one surface of the non-magnetic material where the magnetic material is joined. The intermediate metal material is formed on the entire surface of one side of the magnetic material by plating or the like, and the intermediate metal material is brought into contact with the nonmagnetic material and the magnetic material in a decompression tank depressurized to atmospheric pressure or lower. The plate material formed by bonding with pressure and heating facing each other is set between a convex mold and a concave mold in which the inner diameter of the bottom surface portion is approximately the same size A2 as the A1, and is pressed with a predetermined pressing pressure. The manufacturing method of the pan for electromagnetic induction heating formed in this way.

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