JPH09225560A - Dissimilar metal joined material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joined member in which a peripheral edge part of a joined surface of metals of different hardness is not peeled even in an environment where heating/cooling is repeatedly applied. SOLUTION: A pierced part 3 which is pierced in the thickness direction is provided on a peripheral edge part of a harder metal 2, and a pot-shaped, recessed hole 5 is formed in which at least one sectional area larger than the area of an opening part is present when imaginarily cut with the plane parallel to the opening part over the whole joined surface of the harder metal 2. A softer metal 1 is filled in the pierced part 3 and the recessed hole 5 to join both metals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining member of dissimilar metals used as a material for an electromagnetic cooking utensil such as a pot, a frying pan, or a rice cooker heated by electromagnetic induction.

[0002]

2. Description of the Related Art Materials constituting the above-mentioned electromagnetic cooking utensils need to be heated by electromagnetic induction.
High magnetic permeability is required, and corrosion resistance is also required because it is constantly exposed to salt water and the like. Examples of materials that meet such conditions include 400 series SUS,
If the whole container is made of SUS, it becomes heavy and expensive, so it was not suitable for practical use.

Therefore, aluminum (including its alloys, the same applies hereinafter), which has low magnetic permeability, is lightweight and inexpensive, has high thermal conductivity and does not rust, is used as the main body of the electromagnetic cooking utensil, and as the electromagnetic induction coil of the electromagnetic cooking machine. There has been proposed an electromagnetic cooking utensil in which a heat generating member having high magnetic permeability is joined to a facing portion.

Brazing or welding may be considered as a method of joining the SUS heat-generating member to a part of the above-mentioned aluminum-made utensil, but brazing has a problem in heat resistance as a cooking utensil. On the other hand, since the welding of SUS and aluminum is difficult and the strength is not stable, the electromagnetic cooking utensils manufactured by these methods were not practical.

Therefore, the applicant of the present invention has proposed a method of firmly joining a member made of a hard metal material such as SUS to a necessary portion of a member made of a soft metal such as aluminum. A large number of vase-shaped holes with smaller openings than the inside are provided on the surface, and the surface with the holes is brought into contact with the required part of the soft-side metal material, and the soft-side metal material is moved from the soft-side metal material to the joint surface by forging or the like. It has previously been proposed to firmly bond the hard side metal material to a part of the soft side metal material by applying pressure (Japanese Patent Application No. 7-226834).

In the joining member obtained by this method, since the soft-side metal material is filled in the pot-shaped hole provided in the hard-side metal material, the hard-side metal becomes part of the soft-side metal due to the anchor effect. It was firmly joined and could be sufficiently applied as a cooking utensil.

[0007]

However, when the applicant of the present invention further conducted a durability test on the joining member prepared by the above method assuming an electromagnetic cooking utensil, the heating was inevitable for the cooking utensil. -It was found that when the cooling cycle is repeatedly applied to the joining member, the entire joining surface is not peeled or dropped, but the vicinity of the periphery of the joining surface is peeled and a gap is generated.

[0008] When this gap occurs in the electromagnetic cooking utensil actually used, foreign substances such as oil and dust may accumulate in the gap to impair the aesthetic appearance of the utensil and cause rusting. Therefore, there has been a demand for a joining member that does not have a gap at the peripheral edge of the joining surface.

The present invention has been made in view of the above technical background, and is a member in which a metal material on the hard side is joined to a metal material on the soft side, which is repeatedly heated and cooled. Even in the case, it is an object to provide a joining member in which the peripheral edge of the joining surface does not peel off.

[0010]

As a result of earnest experiments and researches, the present inventors have found that it is difficult to provide a pot-shaped hole of a metal material on the hard side in the vicinity of the peripheral edge of the joint surface, and the anchor effect is It has been found that the peripheral edge portion of the joint surface peels off when it is repeatedly heated and cooled because it does not reach the peripheral edge portion of the joint surface, and the present invention has been completed.

That is, the present invention is a member in which two metallic materials having different hardnesses are joined, and a penetrating portion penetrating in the thickness direction is provided at the peripheral portion of the metallic material on the hard side, and the hard side is provided. In the soft side, there is at least one cross-sectional area larger than the area of the opening when virtually cut out in a plane parallel to the opening over the entire joining surface of the metal material. The gist of the dissimilar metal joining member is characterized in that the metal material is filled in the penetrating portion and the bite hole provided in the hard metal material, and both materials are joined.

According to the above-mentioned joining member, the potting-shaped bite hole is filled with the soft-side metal material, so that the anchor effect is exhibited, and the soft-side metal material and the hard-side metal material are firmly joined. Further, since the soft side metal material is also filled in the penetrating portion provided in the peripheral edge of the hard side metal material in the thickness direction, a stronger anchoring effect is exerted on the peripheral edge of the joint surface, and the peripheral edge portion Can be effectively prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment in which the present invention is applied to an electromagnetic cooking utensil will be described.

In the electromagnetic cooking utensil group shown in FIG. 3, a heating element (2), which is a hard metallic material capable of generating heat in the electromagnetic cooking device, is provided on the bottom outer surface of the utensil body (1) formed by molding the soft metallic material into an utensil shape. ) Are joined together.

The material constituting the article body (1) may be a softer metal than the material of the heating element (2), but since it is a cooking article, it has heat conductivity, corrosion resistance and light weight. Considering this, it is preferable to adopt an aluminum (including its alloy, the same applies hereinafter) material. Especially considering workability, A10
50, A1070, A1100, A3003, A300
Aluminum materials such as No. 4 are suitable. Further, although the method of forming the article body (1) is arbitrary, it is preferably formed by deep drawing because it forms the body of the electromagnetic cooking article.

In this embodiment, the heating element (2) is made of a magnetic material because it must be joined to a part of the container body (1) to generate heat by induction heating. Further, since it is a cooking utensil, an iron-based material having good corrosion resistance and workability is preferable, and a magnetic SUS material such as SUS430 and SUS405 is particularly preferably used. Further, the heating element (2) does not need to be made of a single material.
A clad material in which an iron-based material such as SS41 is sandwiched by magnetic SUS plates, an aluminized steel plate obtained by immersing a steel plate in an aluminum solution to give the steel plate corrosion resistance, and the like may be adopted.

The heating element (2) is provided with a penetrating part (3), and the penetrating part (3) is provided in the penetrating part (3).
The metal material on the soft side which constitutes (1) is plastically deformed and filled, so that a strong anchoring effect is exerted on the peripheral portion of the heating element (2). The penetrating portion (3) may have a hole shape or a notch shape as long as it can fill the plastically deformed container body (1). The shape is not particularly limited, but the position where the penetrating portion (3) is provided in the heating element (2) is
The peripheral end side is more preferable than the midpoint of the straight line connecting the peripheral end and the center of the heating element (2). This is for exerting a stronger anchoring effect on the periphery of the heating element (2). 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 arranged inside the peripheral portion of the heating element (2). They are arranged annularly via the part (4). By thus arranging the penetrating portion (3) in an annular shape, it is possible to minimize the disturbance of the flow of the induced current generated in the heating element (2) when the electromagnetic cooker is used.

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. And the bite hole (5)
In addition, the material forming the article body (1) is plastically deformed and filled in a retaining state, so that the anchor effect is exerted, and the joint strength between the article body (1) and the heating element (2) is improved. ing.

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 has a desired pot shape and can be processed at high speed, it is suitable to be processed by irradiation with an electron beam.

Next, a method of manufacturing the electromagnetic cooking device shown in FIG. 3 will be described.

First, a soft side metallic material constituting the container body (1) and a hard side metallic material constituting the heating element (2) are prepared. The shape of the article main body (1) to be joined can be arbitrarily selected depending on the pressing method during joining. 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.

Next, the heating element (2) is molded into a plate shape having an arbitrary shape such as a circle, the through-hole (3) is provided on the heating element (2), and the joint surface of the heating element (2) is formed. A large number of pot-shaped bite holes (5) are provided.

Next, the container body (1) and the heating element (2)
And at the same time, part of the body (1) of the article penetrates
And the bite hole (5).

For joining, as shown in FIG. 1 (a), the heating element (2) and the article body (1) are placed in this order on the mold (6). 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. In addition, in this embodiment, a gap (8) is provided between the peripheral portion of the heating element (2) and the rising portion (7) of the mold (6).
Is provided.

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. As a pressing method, a rolling method or a forging method can be adopted. In particular, the forging method can press only a portion necessary for joining and filling, and the object body (1) is shaped into an object shape. Also in this case, the pressure can be applied, which is preferable. Furthermore, the pressurization may be performed cold or hot. In particular, if aluminum is used as the material for the body (1) and the parts are joined by hot forging,
It is preferable in that the deformation resistance of aluminum can be reduced and the energy consumed during forging can be reduced. in this case,
A suitable heating temperature for aluminum is 150 to 350 ° C.

By the above-mentioned pressurizing step, the container main body (1) is plastically deformed at the portion outside the peripheral portion of the penetrating portion (3) and the heating element (2), and the plastically deformed material is shown in FIG.
As described above, the gap (8) formed by the penetrating part (3) and the outer periphery of the heating element (2) and the rising part (7) of the mold (6) is filled. Therefore, as shown in FIG. 3, the filling portion is formed in a ring shape of two inner and outer rings, so that a strong anchor effect is exerted at this portion to firmly join the heating element (2).

Simultaneously with the above, the material of the container body (1) bites into the biting hole (5) provided in the heating element (2) in a filled state so that the container body (1) and the heating element (2) are joined. It 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).

The electromagnetic cooking utensil obtained by the above-mentioned method has a hard side on a part of the main body (1) made of a soft side metal material due to the anchor effect of the metal material filled in the bite hole (5). A heating element (2) made of a metallic material is firmly joined, and further, the heating element body (1) filled in the penetrating part (3) and the heating element body (2) surrounding the peripheral edge of the heating element (2).
Due to the anchor effect, peeling of the peripheral portion of the joint surface is effectively prevented, and even if it is repeatedly heated and cooled over a long period of time, it can be sufficiently used.

In the above embodiment, the heating element (2) is used.
Although the case where the hole-shaped penetrating portion (3) is arranged in the vicinity of the peripheral edge of the ring is shown in FIG. 4, as shown in FIG. The part (3) may be formed, or a penetrating part (3) having a notched peripheral edge may be provided as shown in FIG. In any of these cases, a strong anchoring effect can be exerted on the periphery of the heating element (2).

[0030]

As described above, according to the present invention, a penetrating portion that penetrates in the thickness direction is provided in the peripheral portion of the hard-side metal material, and an opening is formed over the entire joint surface of the hard-side metal material. There is at least one cross-sectional area larger than the area of the opening when virtually cut out in a plane parallel to, a pot-shaped bite hole is formed, the soft side metal material is the hard side metal material It is characterized in that the through-hole provided and the bite hole are in a filled state, and both materials are joined, so that by biting into the bite hole, a strong anchor effect can be exerted, and the soft side metal In addition to being able to effectively prevent the material from falling off, it is possible to effectively prevent peeling of the peripheral edge portion of the joint surface by filling the penetrating portion with the soft-side metal material.

[Brief description of drawings]

FIG. 1 is a schematic view for explaining a method for manufacturing an electromagnetic cooking device according to a position embodiment of the present invention,
(A) is a cross-sectional view before pressure-bonding the container body and the heating element, (B) is in the middle of pressure-bonding, and (C) is a cross-sectional view after pressure-bonding.

FIG. 2A is a plan view of the heating element viewed from the joint surface,
Similarly, (B) is a vertical sectional view, and (C) is an enlarged vertical sectional view for explaining the bite hole.

FIG. 3 is a diagram schematically showing an electromagnetic cooking utensil according to an embodiment of the present invention, in which a is a longitudinal sectional view and b is a plan view.

4A and 4B are plan views each schematically showing another example of the shape of the heating element.

[Explanation of symbols]

 1 ... Instrument main body (soft side metal material) 2 ... Heating element (hard side metal material) 3 ... Penetration part 5 ... Penetration hole

Claims (1)

[Claims] 1. A member in which two metallic materials having different hardness are joined together, wherein a penetrating portion (3) penetrating in a thickness direction is provided at a peripheral portion of a hard metallic material (2), A vase-like bite hole (5) in which there is at least one cross-sectional area larger than the area of the opening when virtually cut out in a plane parallel to the opening over the entire joining surface of the metal material (2) on the hard side. ) Is formed, the soft side metal material (1) is filled into the penetrating part (3) and the bite hole (5) provided in the hard side metal material (2), and both materials are joined. A dissimilar metal joining member characterized by being formed.