JP2757300B2 - Metal container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substantially cylindrical body formed by processing a pipe or the like, and a substantially dish-shaped bottom formed by processing a plate material, and the periphery of the bottom is welded to the edge of the body. And to a metal container suitable for an inner container of a stainless steel thermos, for example.

[0002]

2. Description of the Related Art Taking an inner container of a stainless steel thermos as an example, this is manufactured by joining a body and a bottom body, and a process of welding the body and the bottom body which are in contact with each other in a butt or fitting manner. Pass.

[0003] In the former butting method, the body and the bottom body are butted within the range of the plate thickness, and the two are welded. However, the accuracy of the butted part cannot be maintained due to the heating during welding, and especially the body with expanded pipes has a tendency to shrink, and the bottom body processed from a plate material has the tendency to expand, so it is very difficult to adjust,
In addition to poor workability, it is very difficult to reduce the thickness, and the defect rate increases.

In the latter fitting method, a stepped portion is formed at the lower end of the body, and a bottom plate is fitted therein and welded. Therefore, compared with the butt method, the workability is better and the thickness can be reduced. However, since the joint is located at (the outer peripheral edge of) the bottom, a bead-like weld mark is visible from the sprue, which causes a loss in external appearance and lowers the commercial value of the product. Also, if the welding is made thinner in consideration of the appearance, insufficient penetration occurs, and sufficient bead does not come out, which causes crevice corrosion.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and its object is to increase the commercial value by making it difficult for welding marks at the joint to be seen from the mouth and the like, and to increase the commercial value. To improve the workability and significantly reduce the reject rate, and at the same time, make it possible to reduce the thickness.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a metal container, in which a joint between the expanded body and the bottom body is set on a side surface of the body. Means of forming a rising part facing the side of the fuselage at the periphery of the body and providing a receiving part for receiving the rising part of the bottom body inside the joint part on the fuselage that tends to shrink by heating during welding It is.

The rising portion formed on the bottom body positions the joint with the body on the side surface of the body, so that a bead-like trace due to welding is difficult to see from the mouth of the container.

[0008] The body has a receiving portion for receiving the rising portion of the bottom body inside the body. For this reason, even if the joint part of the substantially cylindrical body formed by processing a pipe or the like is heated by welding and contracts, the receiving part acts to push the rising part of the bottom body from the outside to the inside, and this is the body. To reduce the gap between the joint and the bottom.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A metal container according to the present invention uses a substantially cylindrical body 10 formed by processing a pipe or the like. In this case, pipes and the like are those that are seamlessly manufactured by drawing,
It includes a plate material bent into a cylindrical shape and side edges welded in the axial direction. In particular, the body used in the metal container of the present invention is obtained by further expanding the pipe-shaped raw material as described above, and thus tends to shrink (deform from outside to inside) when heated. It is.

The metal container of the present invention uses a substantially dish-shaped bottom plate 20 formed by processing a plate material. When a heat is applied to the bottom body 20 by drawing the rising portion 21 on the plate material, the bottom member 20 tends to expand (deform from the inside to the outside). The fact that the body 10 has a heating shrinkage tendency and the bottom body 20 has a heating expansion tendency at the same time that the inward force and the outward force exert a synergistic effect at the joint, Only the body 10 has a tendency to shrink, and the bottom body 20 can generate a larger acting force at the joint than when it hardly deforms.

The joint between the body 10 and the bottom body 20 is
Is located at a position where the rising portion 21 of the bottom body 20 and the lower end portion 11 of the body 10 are in contact with each other. The rising height of the rising portion 21 is arbitrary.
However, it is better not to be too close to the bottom, as it is less noticeable when it is away from the mouth 12 of the finished container.
Such a body 10 has a rising portion 21 of a bottom body 20.
The receiving part 13 for locating inside is provided. The positional relationship between the inside and the outside depends on the tendency of the body 10 to contract and the bottom body 20.
It is necessary in order to synergize with the expanding trend of The receiving part 13 does not simply receive the bottom body 20,
Can have a structure for better acceptance.

In one example, a lower end portion 11 on the body side and a rising portion 21 on the bottom body side are fitted to each other.
1 is to maintain the positional relationship and the contact state until the welding is completed. For example, as shown in FIG.
At its lower end 11 is provided a receiving part 13 having a radial element 14 projecting radially outward therefrom and an axial element 15 bent from its tip in the body axis direction. Correspondingly, the riser 21 of the bottom body 20 is also provided with a radial element 24 projecting radially outward therefrom, so that its tip is fitted inside the axial element 15.

The specific configuration of the receiving section 13 is shown in FIG.
Is not limited to the example. In short, the object of the present invention can be achieved by a configuration in which the gap between the joints is reduced by contraction of the body 10 due to heating during welding and expansion of the bottom body 20. In this configuration, the body 10 and the bottom body 20 are held in a fixed relationship using jigs 31 and 32 (see FIG. 4).
Heat is applied to the metal of the body 10 and the metal of the bottom body 20 that have come into contact at the receiving portion 13, and the metal is melted and joined together (right half in FIG. 3). In addition, a filler material can be used as needed.

The embodiment shown in each figure will be further described. In this embodiment, the present invention is applied to a metal container used for an inner container of a stainless steel thermos. Therefore, the body 10 and the bottom body 20 are both made of stainless steel, the body 10 is a bottomless, open mouth with a stainless steel pipe expanded, and the bottom body 20 is a dish-shaped having a rising portion 21 formed by drawing a stainless steel plate. belongs to.

The joint of the body 10 is provided with a receiving portion 13 having the above-mentioned radial element 14 and axial element 15 facing the bottom in order to receive the periphery of the bottom body 20. In addition, the radial element 1 is also provided at the joint at the peripheral edge of the bottom body 20.
4, a radial element 24 that fits inside the axial element 15 is provided at the upper end of the rising portion 21 (see FIG. 2).

To join them, jigs 31 and 3 shown in FIG.
2 is used. The jig 31 for fixing the body 10 has a holding portion 33 for setting the body 10 upside down, and the receiving portion 13 hangs over the raised portion 24 around the holding portion 33. The bottom body 20 is held in advance by a bottom body jig 32 that moves up and down while maintaining a fixed relationship with the body side jig 31, and its radial element 24 is set to overlap with the radial element 14 of the receiving portion 13. Pressed down (FIG. 4).

When heat is applied to the joint in this state, the body 1
Melting occurs and extends around the wide contact surfaces of the radial elements 14, 24 of the 0 and the bottom body 20, mainly. In particular, since the heat at the time of welding further increases the contact pressure of the contact surface between the body 10 and the bottom body 20, the weldability is very good. FIG. 5 shows a combination of the outer case 40 and the metal container of the present invention after welding, which constitutes the main body of a stainless steel thermos.
In addition, 35 shows a bead-like welding mark. The welding mark 35 also appears on the inner side surface of the metal container.

[0018]

Since the present invention is constructed and operates as described above, the joint between the fuselage and the bottom is on the side of the fuselage, and welding marks are hardly visible from the mouth and are not conspicuous. The value of the joints increases, and the joints have an inner bottom with a rising part that fits inside the joints and can apply pressure to the joints during welding. Since welding is performed and a bead-like welding mark is sufficiently formed, an effect of reducing the thickness can be achieved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a metal container according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing an embodiment of the bonding portion.

FIG. 3 is a longitudinal sectional view before welding (right half) and after welding (left half).

FIG. 4 is an explanatory sectional view of a state set in a welding jig.

FIG. 5 is a vertical sectional view of a stainless steel thermos.

Claims (5)

(57) [Claims] 1. A substantially cylindrical body formed by processing a pipe or the like,
A metal container consisting of a substantially dish-shaped bottom body processed from a plate material, which is joined together by welding the periphery of the bottom body to the edge of the body, and the expanded body and the bottom body In order to set the joint on the side of the fuselage, a rising portion facing the side of the fuselage is formed on the periphery of the bottom, and the body that tends to shrink by heating during welding has a bottom inside the joint A metal container provided with a receiving portion for receiving a rising portion of the metal container. 2. The receiving portion 13 is provided at the lower end 1 of the body 10.
1 a radial element 14 projecting radially outward therefrom
2. The metal container according to claim 1, comprising an axial element 15 bent from a tip end thereof in a body axis direction. 3. A rising portion 21 of the bottom body 20 is provided with a radial element 24 projecting radially outward therefrom, and a tip thereof is fitted inside the axial element 15 on the body side. 2. The metal container according to claim 1. 4. The metal container according to claim 1, wherein the bottom body is formed by drawing, and has a tendency to expand due to heat during welding inside the receiving portion of the body. 5. The metal container according to claim 1, wherein both the body 10 and the bottom body 20 constitute an inner body of a thermos made of stainless steel.