JPS62243516A - Production of metal thermos - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a method for manufacturing a metal thermos flask whose bottle body has a double structure consisting of an inner bottle and an outer bottle. The present invention also relates to a manufacturing method suitable for forming the cross-sectional shape of the outer bottle into a desired shape other than circular, such as an ellipse or a square.

"Prior Art" Generally, thermos flasks are cylindrical in shape, but it is desired that thermos flasks have a thin shape that is convenient to carry, such as an oval or square cross-sectional shape.

However, in manufacturing such metal thermos flasks, it is difficult to mold the flask and to join the flasks, making it impossible to obtain a satisfactory product.

For example, in manufacturing a metal thermos flask with a circular cross section, which has been commonly used in the past, as shown in FIG. of,
They are manufactured by forming them separately by pressing or spinning, and then butt welding the inner bottle body l and the inner bottle bottom 2 (No. 9).
Figure A).

Further, an outer bottle having a larger diameter than the inner bottle that surrounds the inner bottle with a certain gap therebetween, and an outer bottle body 1' and an outer bottle bottom 2' each having a circular cross section are similarly formed separately. After placing the outer bottle body 1' on the outer periphery of the inner bottle
The outer bottle body 1' and the outer bottle bottom 2' are butt-joined to form an outer bottle Y, and the inner and outer bottles X and Y are integrated with a gap in between. Note that Z evacuates the space between the walls of the inner and outer bottles x and y using an exhaust hole provided at the bottom of the outer bottle, and then the bottle is sealed to become a metal thermos flask.

"Problems to be Solved by the Invention" However, when trying to manufacture a metal thermos flask with an elliptical cross-sectional shape as shown in Figure 1θ (B),
Similarly to the example shown in the figure, in advance, FIG.
As shown in FIGS. 12(A) and 12(B), the inner and outer bottle bodies 3 and 3' and the inner and outer bottle bottoms 4 and 4' have oval cross-sectional shapes.
are separately formed by pressing or spinning, and then the inner bottle X is formed by butt-welding the inner bottle body 3 and the inner bottle bottom 4, and then the inner bottle X is covered.

If you try to manufacture the outer bottle body and bottom by arranging them and joining them together, it is relatively easy to maintain airtightness if the weld line is a perfect circle as shown in Figure 9. Welding can be performed, but when the weld line is oval like the one shown in Figure 1θ, the torch angle, arc length, welding heat input, etc. must be kept constant compared to when the weld line is a perfect circle. It is difficult to maintain it, and since the thickness T of the inner bottle used for metal thermos flasks is extremely thin at approximately 0.4 mm, it is extremely difficult to uniformly weld the entire circumference to maintain airtightness. This results in a problem of extremely high costs.

Therefore, if the weld line is non-circular such as an ellipse as shown in Fig. 10, the lower end of the inner bottle body 3 and the inner It has been considered to provide flanges 3a and 4a for welding at the upper end of the bottle bottom 4, respectively, and to make the abutting portions into a double flange type to avoid the difficulty of welding.

When the double flange type is used in this way, welding that can maintain airtightness can be easily carried out regardless of the cross-sectional shape of the inner bottle. However, apart from the outer bottle of a thermos flask, the inner bottle that contains the contents has a flange 3a and a
There is a risk that the contents may enter the gap 5 between the joints 4a and the metal may corrode or the contents themselves may rot, so it cannot be said to be an appropriate method from a sanitary standpoint.

Therefore, it is possible to easily obtain an inner bottle with a non-circular cross-sectional shape such as an oval or square without the need for difficult welding, and a metal thermos flask with a non-circular cross-sectional shape of the inner bottle and outer bottle. There has been a strong demand for the development of a new manufacturing method that can be easily and inexpensively obtained.

This invention was made in response to the above-mentioned need, and it does not require difficult welding and allows for easy fabrication of inner bottles with non-circular cross-sectional shapes.
It is an object of the present invention to provide a method for manufacturing a metal thermos flask, which can be manufactured at a low cost, and can therefore be easily and inexpensively obtained, in which the cross-sectional shape of the inner bottle and outer bottle is non-circular. purpose.

"Means for Solving the Problems" A method for manufacturing a metal thermos flask according to the present invention includes an inner bottle and an outer metal bottle that are joined to each other at the upper end of the bottle, and a body having a mouth and a bottom part, respectively. First, the inner bottle body and the inner bottle bottom are butt welded to complete the inner bottle, and then the mouth of the outer bottle body is joined to the finished inner bottle mouth. Then, the outer bottle bottom is welded to the outer bottle body to form a double-structured bottle body.The inner bottle body and inner bottle bottom, which are prepared first, each have a cross-sectional shape. The inner bottle is formed into a perfect circle and butt-welded to form an inner bottle with a perfect circular cross-sectional shape.Then, the cross-sectional shape of this inner bottle is formed into the desired cross-sectional shape by hydraulic bulge processing. After the forming process, the mouth of the outer bottle body with the desired cross-sectional shape is joined to the mouth of the inner bottle, and then the outer bottle bottom of the same shape is joined to the outer bottle body to integrate the inner and outer bottles. It is characterized by vacuum sealing between the walls of the inner and outer bottles.

"Operation" In the manufacturing method according to the present invention, the inner bottle body and the bottom of the inner bottle, each having a perfect circular cross-sectional shape, are butt-welded to form an inner bottle having a perfect circular cross-sectional shape. Since the perfectly circular inner bottle is formed into the desired cross-sectional shape by hydraulic bulge processing, welding work is relatively easy to manufacture the inner bottle, regardless of the final cross-sectional shape of the inner bottle. Only perfect circular welds are required.

Therefore, according to the manufacturing method according to the present invention, an inner bottle having a non-circular cross-sectional shape can be easily and inexpensively obtained.

In addition, the outer bottle is formed by forming the outer bottle body and the outer bottle bottom in advance to the final shape by pressing or spinning, and the parts where the outer bottle body and the outer bottle bottom butt each other are If flanges are provided and the desired shape of the outer bottle is obtained by welding these flanges together, the outer bottle can be formed relatively easily in the same way as the inner bottle.
And it can be obtained at low cost.

Therefore, it is possible to easily and inexpensively obtain a metal thermos flask in which the inner bottle and outer bottle have non-circular cross-sectional shapes.

“Example J An embodiment of the present invention will be described below.

The manufacturing method of this embodiment takes as an example a case of manufacturing a metal thermos flask with an oval cross-sectional shape, in which a metal inner bottle and an outer metal bottle are connected to each other at the upper mouth. The body and bottom are formed separately, and the inner bottle is first butt-welded to the inner bottle body and the bottom, and then the mouth of the outer bottle body is welded together. It is attached to the mouth of the inner bottle completed in 2008, and then the bottom of the outer bottle is welded to the body of the outer bottle to form a double-layered bottle body.These points are the same as before. .

However, the inner bottle body 10 and the inner bottle bottom 11 (see Fig. 1 (A)) that are prepared first have a perfect circular cross-sectional shape, and they cannot be butt welded. As a result, an inner bottle 12 having a perfect circular cross-sectional shape is formed as shown in FIG. 1(B).

Next, this inner bottle 12 is set in a mold 13 for bulge processing, as shown in FIG. 1(C), in order to perform hydraulic bulge processing. This mold 13 is divided into a plurality of parts along the axis A direction of the bottle, and while injecting high-pressure liquid from the liquid injection port 13a, the gaps 13b and 13c between each divided mold are narrowed. By doing this, while applying a liquid pressure P to the inner surface of the inner bottle 12, a compressive force in the direction of the axis A is applied to the outer surface of the inner bottle 12, and as shown in FIG. An inner bottle 14 matching the internal shape of the bottle is obtained.

In the mold 13 shown in FIG. 1(C), the upper side of the axis I shows the state before molding, and the lower side of the axis I shows the state after molding. Also, the dimensions in this diagram. indicates the length dimension of the inner bottle 12 before molding, and "dimension" indicates the length dimension of the inner bottle 14 after molding.

The inner bottle 14 in FIG. 2 shows the final shape of the inner bottle, and the upper end mouth portion 14a has a perfectly circular cross-sectional shape as shown in FIG. 2(A), and the body portion 14b The cross-sectional shape of
As shown in Figure (C), it is shaped into an ellipse with a long sleeve length of 1 and a short axis length of a.

Next, as shown in FIG. 3 (A
The mouth part 15a of the outer bottle body 15, which has been previously formed into an elliptical cross-sectional shape by pressing or the like, is joined to the mouth part 14a of the outer bottle body 15, and then, as shown in FIG. The outer bottle bottom 16 formed into an oval shape is connected to the outer bottle body 1.
5 is welded to complete the outer bottle 17 having an elliptical cross-sectional shape, and the outer bottle 17 and the inner bottle 14 are both made into a bottle body 18 having an elliptical cross-section.

Note that the outer bottle body 15 and the outer bottle bottom 16 are welded together by butting and welding the flanges 15a and 16a provided at each end. This makes welding easier.

Further, the bottom 17a of the completed outer bottle 17 is provided with a vacuum opening 17b for making the gap 19 between the inner bottle 14 and the outer bottle 17 a vacuum heat insulating layer.

This opening 17b is closed with a lid member (see FIG. 6) in a vacuum environment after the evacuation operation.

Regarding the case where a cylinder with a perfect circular cross section is formed into a cylinder with an elliptical cross section by the above-mentioned hydraulic bulge processing or press working, generally, a metal material with physical properties of about 5U9304 is used. The cylindrical body has a diameter of about 1.
It can be expanded to about 4 to 1.5 times. Therefore, as shown in Fig. 5(A), if the original diameter of the perfectly circular cylindrical body X is Do, it is 1.4~1.
．． The length of the short axis of the bulged cylinder is as shown in FIG. 5(B). When molded into an elliptical Y, the length of the long sleeve of the elliptical Y may be approximately twice the short axis.

FIG. 6 (A XB XC) shows a metal thermos flask manufactured by the method of the above-described embodiment.

As can be understood from this figure, the gap 19 between the inner bottle 14 and the outer bottle 17 is made into a vacuum layer by evacuation from the aforementioned opening 17b, and this opening 17b is , a lid member 21 brazed to the bottom of the outer bottle 17
is blocked by. In addition, the mouth of the bottle body 18 is
It is closed by an inner stopper 22, and a stopper 23 is set on the outer circumferential side of the inner stopper 22.

In the manufacturing method described above, the inner bottle body 10, which has a perfect circular cross-sectional shape, and the inner bottle bottom 1■ are butt-welded to form the inner bottle 12, which has a perfect circular cross-sectional shape, and this cross-sectional shape Since the inner bottle 12, which has a perfect circular shape, is formed into an oval cross-sectional shape by hydraulic bulge processing, the final inner bottle 1 is
Regardless of the cross-sectional shape of 4, only perfect circular welding, which is relatively easy to weld, is required.

Therefore, according to the manufacturing method, the inner bottle 14 having an elliptical cross-sectional shape can be easily and inexpensively obtained.

In addition, the outer bottle 17 has the outer bottle body 15 and the outer bottle bottom 16 formed in advance by pressing or spinning to match the final shape, and the outer bottle body 15 and the outer bottle bottom 16 are Flanges 15a are provided at the portions that butt each other.
-16a are provided, and these flanges 15a16a
Since the outer bottle 17 having a desired shape is obtained by welding them together, the outer bottle 17 also does not require difficult welding and can be obtained relatively easily and at low cost like the inner bottle.

Therefore, a metal thermos flask in which the inner bottle 14 and the outer bottle 17 have an elliptical cross-sectional shape can be easily and inexpensively obtained.

In addition, although the cross section of the outer bottle 17 and the inner bottle 14 was made into an ellipse shape in the above-mentioned one Example, it is not limited to this. The outer bottle may have various non-circular cross sections in addition to the elliptical cross section, and the above manufacturing method can be effectively used to manufacture bottles with such special shapes.

Figure 7 (A) (B) (C”), and Figure 8 (A
), (B), and (C) each show an example of the inner bottle 14 whose cross-sectional shape is made into a special shape other than an ellipse according to the present invention.

"Effects of the Invention" As is clear from the above description, the method for manufacturing a metal thermos flask according to the present invention comprises an inner bottle and an outer metal bottle that are joined to each other at the top end, each having a mouth. The body and bottom are formed separately, and the inner bottle is first completed by butt welding the inner bottle body and the bottom of the inner bottle, and then the mouth of the outer bottle body is completed. The outer bottle body is joined to the mouth part and then the outer bottle bottom is welded to this outer bottle body to form a double structure bottle body.The inner bottle body and inner bottle bottom are prepared first. , each has a perfect circular cross-sectional shape, and these are butt-welded to form an inner bottle with a perfect circular cross-sectional shape. Next, the cross-sectional shape of this inner bottle is shaped into the desired cross-sectional shape by hydraulic bulge processing. Because the inner bottle is formed into a shape, only a perfect circular welding process is required, which is relatively easy to weld, regardless of the final cross-sectional shape of the inner bottle.

Therefore, according to the manufacturing method according to the present invention, an inner bottle having a non-circular cross-sectional shape can be easily and inexpensively obtained.

In addition, the outer bottle is formed by forming the outer bottle body and the outer bottle bottom in advance to the final shape by pressing or spinning, and the parts where the outer bottle body and the outer bottle bottom butt each other are If flanges are provided and the desired shape of the outer bottle is obtained by welding these flanges together, the outer bottle can be formed relatively easily in the same way as the inner bottle.
And it can be obtained cheaply.

Therefore, it is possible to easily and inexpensively obtain a metal thermos flask in which the inner bottle and outer bottle have non-circular cross-sectional shapes.

[Brief explanation of drawings]

Figures 1 to 4 illustrate one embodiment of the present invention.
Figure 1 (A , Fig. 2(C) is a bottom view of the same, Fig. 3(A) is a front view of the outer bottle body joined to the inner bottle, Fig. 3(B) is a bottom view of the same, and Fig. 4 is a bottom view of the same. A front view of the bottle body formed by the manufacturing method of the example, FIGS. It shows an empty thermos flask.
Figure 6 (A) is a front view, Figure 6 (B) is a side view, Figure 6 (C) is a bottom view, and Figures 7 (A) (B Other examples of the bottle are shown: Figure 7 (A) is a front view, Figure 7 (B) is a side view, and Figure 7 (B) is a side view.
Figure (C) is a bottom view, and Figure 8 (AXB) (C) shows still another example of the inner bottle molded according to the present invention.
Figure (A) is a front view, Figure 8 (B) is a side view, Figure 8 (C
) is a bottom view, Figure 9 (A XB ) and Figure 1O (A
) and (B) respectively show the inner bottle of a conventional metal thermos flask.
) is a sectional view taken along line B-B in FIG. 9(A), FIG. 10(A) is a front view, FIG. 10(B) is a sectional view taken along line BB in FIG. XB') is a front view and a bottom view of the inner bottle body of the inner bottle in Fig. 10, and Fig. 12 (A) and (B) are respectively a front view and a bottom view of the inner bottle bottom of the inner bottle in Fig. 1O. Figures 13(A) and 13(B) show one method for manufacturing the inner bottle shown in Figure 1θ. Figure 13(A) is a front view, and Figure 13(B) is the same as Figure 13(A). BB sectional view of 14th
The figure is an explanatory diagram of the drawbacks of the manufacturing method shown in FIG. 13. 10... Inner bottle body, 11... Inner bottle bottom, 12, 14... Inner bottle, 13... Molding mold, 14a... ...Mouth, 15... Outer bottle body, 16... Outer bottle bottom, 15a/16a...
Flange for use, 17... Outer bottle, 18...
Bottle body, 19. Old... Gap.

Claims (1)

[Claims] An inner bottle and an outer bottle made of metal, which are joined to each other at the mouth at the upper end, are formed separately into a body having a mouth and a bottom, and first, the inner bottle body and the bottom of the inner bottle are butt welded. to complete the inner bottle, then join the mouth of the outer bottle body to the finished inner bottle mouth, and then weld the outer bottle bottom to this outer bottle body to create a double structure bottle. A method for manufacturing a metal thermos flask that forms the main body, in which the inner bottle body and the inner bottle bottom are first prepared, each having a perfect circular cross-sectional shape, and then butt welded to form a cross-sectional shape. forms a perfectly circular inner bottle, then the cross-sectional shape of this inner bottle is formed into a desired cross-sectional shape by hydraulic bulge processing, and after this forming operation, the outer bottle body is formed into a desired cross-sectional shape in advance. The mouth of the bottle is joined to the mouth of the inner bottle, and the bottom of the outer bottle of the same shape is joined to the body of the outer bottle to integrate the inner and outer bottles, and then the walls of the inner and outer bottles are vacuum-sealed. A method of manufacturing a metal thermos flask.