JPS6137744B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal cooking container that is used by heating.

Cooking containers such as pots, kettles, and kettles are made of various materials such as metal, glass, and ceramics, and among these, metal cooking containers are the most commonly used. Such metal containers include iron, aluminum, stainless steel, copper, etc.
Alternatively, a wide variety of products are used, such as those made by laminating these materials together, and even those whose iron surfaces are treated with enameling or treated with fluororesin as functional improvements. Copper cooking containers are also popular because of their high-class image due to their elegant color and luster, and their good thermal conductivity, and the demand for them has increased particularly in recent years.

However, copper containers are more expensive than those made of other materials, and are also unsuitable for electromagnetic cookers, which are sold as safe cookers that do not use fire.

An electromagnetic cooker is a cooker that is equipped with an excitation device that generates eddy current in an alternating magnetic field from a commercial current and performs induction heating, and the material used for the container is limited to those that cause iron loss and eddy current loss. .

Ferromagnetic metals such as iron and nickel are suitable as such materials, and copper is not suitable.

The present inventor made a container body of copper material and made the bottom part of the container from the above-mentioned magnetic material as a cooking container which can be suitably used in an electromagnetic cooker without damaging the high-quality image of the above-mentioned copper container. As a result of intensive studies based on the idea of manufacturing the product using a different metal, we have completed the present invention as outlined below.

That is, the present invention provides a method for manufacturing a cooking container, characterized in that a bottom member made of a metal material made of a magnetic material is joined to a copper container body member by lap welding while cooling the bottom member. This will be explained in detail below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of the main components of the kettle body which can be obtained by the method of the present invention, in which a pre-shaped container body member 1 is shown in (a) and a bottom member 3 is shown in (b).
The joint edges have a flange 2 and a tsuba 4 that are bent outward, respectively, and as is clear from Fig. 2, the tsuba 2 and 4 are overlap welded. .

The body member 1 is obtained by deep drawing a copper material, and the bottom member 3 is obtained by forming a magnetic metal, 18-chromium stainless steel.

In Fig. 2, 5 is a spout made of copper, 6 is a handle made of Shinchiyuu, and 7 is a lid made of copper. Can be installed by twisting.

The present inventor first developed the above-mentioned copper body member 1 and 18-
When an attempt was made to join the bottom member 3 made of chrome stainless steel by welding, the part of the bottom member to be joined melted faster than the part of the body member to be joined, and in the end it could not be joined.

As a result of subsequent experimental research, we obtained the following knowledge and were able to solve this problem.

That is, the copper that makes up the body 1 is a metal with high thermal conductivity, while the 18-chromium stainless steel that makes up the bottom 3 has a lower thermal conductivity than copper.

When welding metals with such differences in thermal conductivity, the copper heat spreads quickly throughout the parts and dissipates to the surroundings, which substantially increases the melting point of the parts to be joined. On the other hand, it has been determined that stainless steel absorbs heat slowly and is mostly limited to the areas to be joined, which results in a substantially lower melting point and incomplete melting.

In the method of the present invention, a flange 2 is provided on the body member 1 and a flange 4 is provided on the bottom member 3, and a presser die 8 having a cooling water passage 11 formed inside is applied to the bottom member 3.
Cooling water is introduced from the cooling water inlet 9, discharged from the outlet 10, and circulated to cool almost the entire bottom member 3, and by performing lap welding at the flange, it is easy to perform welding with an extremely excellent finish. It was achieved.

Such cooling prevents the local temperature rise that occurs in the stainless steel of the bottom member 3 during welding, and this makes it possible to easily adjust the melting points of the stainless steel of the bottom and the copper of the body, making welding extremely easy. It is possible.

Further, according to this method, it is possible to weld a large number of cooking vessels one after another in succession, and mass production with high efficiency is also possible.

The temperature of the presser mold can be adjusted to a predetermined temperature by changing the temperature and amount of cooling water, but the temperature is generally below 40℃, depending on the shape of the cooking container to be manufactured and the thickness of the material. , preferably 20-30℃
Argon welding is preferable for welding. In the method of the present invention, the material of the bottom member used is a magnetic metal material, and in addition to the above-mentioned stainless steel, iron, nickel, or nickel-plated iron can be used. etc. can be used, but corrosion resistance,
and from an aesthetic standpoint, the use of stainless steel is most desirable.

The thicknesses of the bottom member and the body member are preferably such that the copper body member is slightly thinner than the bottom member.

The necessary condition for joining the body member and the bottom member is lap welding at the flange, and this type of joining can be expected to provide a more reliable and strong finish than butt welding. Temperature control becomes easy, and these factors combine to enable excellent bonding.

In addition, it is desirable to join near the bottom of the long container to maintain the appearance of the copper container, but when heating with an electromagnetic cooker, the excitation winding of the cooker and the magnetic pole core may According to the principle of magnetic induction heating, in which the generated magnetic flux interlinks with the bottom of the cooking container to self-heat and heat the object to be heated, the area shown above, which includes the entire flat plate part of the bottom, is the best. .

As described above, the method of the present invention is a simple method in which the body, which occupies most of the container, is made of copper, the bottom is made of a magnetic metal material, and the bottom member is welded while cooling. It is excellent in that the bonding is ensured by a suitable means, thereby making it possible to use it in an electromagnetic cooker without compromising the luxury of a copper product. Furthermore, the container obtained by the method of the present invention can be used for cooking using heating means such as gas or electric heating, with no inferiority compared to ordinary cooking containers, making it an invention with extremely high utility value. .

The present invention will be explained below with reference to Examples.

Example 1. Approximately 18 cm in diameter with the shape of a kettle as shown in Figure 1.
A body member 1 with a thickness of 0.8 mm and a bottom member 3 made of 18-chromium stainless steel, also with a diameter of about 18 cm and a thickness of 0.9 mm, are welded with argon using a presser die 8 as shown in Figs. 3 and 4. Ta.

At this time, the water temperature is 24 to 25℃ as the cooling water inside the presser die.
While circulating tap water, the temperature of the presser mold was raised to approximately 30°C.
I welded while keeping it at ℃, but it was possible to weld without any problems.
The finish was sturdy and clean.

Using this method, it was possible to join a large number of kettle parts in a continuous manner, but when the temperature of the presser mold was set to 45°C, the bottom part melted rapidly, making welding difficult.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the main components of the kettle body obtained by the method of the present invention, and a shows the container body member;
b indicates the bottom member, respectively. FIG. 2 is a vertical cross-sectional view showing the final form of the kettle obtained by the method of the present invention, FIG. 3 is a vertical cross-sectional view showing the method of joining the container body member and the bottom member, and FIG. It is an AA sectional view in the figure. 1... Container body member, 3... Bottom member, 2,
4...Tsuba, 8...Press mold, 11...Cooling water passage.

Claims (1)

[Claims] 1. A method for manufacturing a cooking container, which comprises joining a bottom member made of a magnetic metal material to a copper container body member by lap welding while cooling the bottom member.