JPS61106121A - Production of metal double bottle - 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 [Technical Field] The present invention relates to a metal thermos flask, a vacuum insulated cooking utensil, etc., in which a metal inner cylinder and a metal outer cylinder are integrally joined at the mouth. This relates to a method for manufacturing heavy bottles.

"Prior art and its problems" What is shown in FIG. 8 is a metal wide-mouth thermos flask manufactured by a conventional method. Generally, metal double bottles such as this metal wide-mouth thermos flask are manufactured by welding a metal inner cylinder l and a metal outer cylinder 2 together at the mouth part 3, which creates a double air bottle. Efforts are being made to improve production efficiency. Conventionally, when manufacturing a double metal bottle in this way, the ends of the welded double air openings 1 & 3 are cut with a lathe or the like to separate the opening Wla of the inner cylinder 1 and the opening of the outer cylinder 2. Finishing was carried out by aligning the edges of the portion 2a as shown in FIG. 9 and polishing the cut surface.

By the way, by reducing the amount of heat conducted from the inner cylinder 1 to the outer cylinder 2,
In order to improve the heat retention performance of the metal double bottle, it is required to reduce the wall thickness t of the mouth part 3 of the double bottle. However,
If the mouth part 3 is made thin, the strength of the mouth W30 will decrease, so if a double wind is manufactured using the conventional method, the mouth part 3 will deform when finishing the mouth part 3 by turning, etc., resulting in a defective product. Easy,
There were problems such as increased difficulty in finishing work and a decrease in production efficiency due to careful finishing work. Furthermore, even if the mouth part 3 could be finished appropriately, the Since the strength of the mouth part 3 of heavy wind is low,
If a 3Vc impact is applied to the mouth part, such as by tipping over the double wind during use, mouth 1! [S3 transforms into a container. For this reason, the obtained double-breasted metal sash bottles tend to have poor appearance quality, require careful handling, and have low commercial value.

``Purpose of the Invention'' This invention was made in view of the above circumstances, and is made of metal, which does not require finishing by lathe, polishing, etc., has high strength at the mouth, and has high commercial value and excellent heat retention performance. It is an object of the present invention to provide a method for manufacturing a metal double bottle, which can efficiently manufacture a heavy bottle.

"Means for Solving Problems" Hereinafter, means for solving the above problems will be described in detail with reference to examples.

FIG. 1 shows a metal wide-mouth thermos manufactured by the manufacturing method of the present invention, and the same components as those manufactured by the conventional manufacturing method shown in FIG. 8 are given the same reference numerals. Simplify the explanation.

This metal wide-mouth thermos consists of an inner tube 1 and an outer tube 2 made of metal such as stainless steel or carbon steel. The opening W2 & of the outer cylinder 2 of this thermos flask is the radially outward side of the outer cylinder 2)
Ci! It has an R tune. The opening 1& of the inner cylinder 1 is also bent radially outward of the inner cylinder 5, overlapped with the opening 2a of the outer cylinder 2, and welded to the opening. The width of the mouth l& of the inner cylinder l is wider than the width of the mouth 2& of the outer cylinder 2.
．． The inner cylinder mouth part 1a, which is located outside the opening edge 2b of the mouth part 2& of the outer cylinder 2, is folded back and clamps the edge part of the mouth part 2& of the outer cylinder 2.

Next, this metal wide-mouth thermos flask is manufactured. A brief example of the manufacturing method of the present invention will be explained.

In order to manufacture the metal wide-mouth thermos flask, first, the inner cylinder 11
Each outer cylinder 2 is formed into a predetermined shape. At this time, the mouth portion 2a of the outer cylinder 2 is formed into a final shape that is bent outward in the radial direction of the outer cylinder 2. On the other hand, the opening 4 & of the inner cylinder 1 is bent outward in the radial direction of the inner cylinder 1 as shown in FIG. It is bent toward T1 of 1, and the cross-sectional shape is formed into an abbreviated shape.

Next, in this manufacturing method, the inner cylinder l and the outer cylinder 2 are
As shown in FIG. 2, the inner cylinder 1 is assembled with the mouth 1& of the outer cylinder 2 extending beyond the opening edge 2b of the outer cylinder 2. In this example, the opening 1& of the inner cylinder 1 is formed in a cross-sectional shape bent slightly outward from the opening edge 2b of the opening 2a of the outer cylinder 2, so that the inner and outer cylinders 1 and 2 are the opening W752a of the outer cylinder 2
are combined so as to be in contact with the joint portion 5 extending in the radial direction of the mouth M1 & of the inner cylinder l.

Next, the inner and outer cylinders 1. The inner cylinder joint part 5 of No. 2 and the outer cylinder opening part 2& are welded together. As for welding, seam welding, plasma welding, TI
Methods such as G welding and brazing are used.

After this welding is completed, in the method of the present invention, the mouth part 1 of the inner cylinder 1 which is heated and extends from the open end R2b of the outer cylinder 2
The extending portion 6 of a is folded back so as to wrap around the edge portion of the mouth portion 2a of the outer cylinder 2. In this example, the mouth 1& of the inner cylinder 1 having a cross-sectional shape is bent from the bent part 1o, and the mouth 2a of the outer cylinder 2 is formed by connecting the bent extension part 6 and the joint part 5. Pinch and then swage this part to cover the mouth 2 and edges of the outer cylinder 2 watertightly.

After the openings 1a and 2m of the outer and outer cylinders 1 and 2 have been joined in this manner, in this manufacturing method, the space between the outer and outer cylinders 1 and 2 is evacuated using a vacuum heating furnace, and the outer cylinder 2 is The exhaust lower at the bottom of the is sealed by soldering a sealing plate 8. Thereby, the space between the inner and outer cylinders 1 and 2 is made into a vacuum insulation layer 9, and a metal wide-mouth thermos flask is manufactured.

In such a method of manufacturing a double metal bottle, the openings 1a and 2a of the inner and outer cylinders 1 and 2 are connected to the openings 1a and 2a of the inner cylinder l, and the opening 1& of the inner cylinder l is connected to the outer cylinder 2.
are joined and integrated in a state extending outward beyond the opening edge of the inner cylinder 1, and then the extending portion 6 of the opening 11a of the inner cylinder 1 is folded back so as to wrap around the edge portion of the opening 2& of the outer cylinder 2. Since a double-walled bottle is manufactured, the resulting double-walled mouth portion 3 has good appearance quality, and there is no need for additional finishing using cutting, polishing, or other means. Therefore, according to this manufacturing method, the wall thickness of the inner and outer cylinders 1 and 2 is reduced to improve heat retention performance, so even if the opening part 30 is weakened and easily deformed due to double wind, There is no worry about deformation of part 3, etc.
It can be manufactured easily and efficiently. In addition, the strength of the resulting double-wind mouth portion 3 is improved by the folded extension portion 6, so that even if the KO portion 3 is subjected to impact and strain during use, it will not deform. The appearance quality is maintained well for a long period of time. As a result, according to this manufacturing method, the inner cylinder 1
Alternatively, by forming the outer cylinder 2 thinner, the heat retention performance of the metal double bottle can be further improved.

In addition, in the manufacturing method of this example, the opening l &
Since the extending portion 6 is bent in advance to a certain extent (i90' in this example) in the direction of folding back, the extending portion 6 can be folded back more easily after the mouth portions 1m and 2a are welded and joined. Therefore, according to this method, no unreasonable force is applied to the folding of the extending portion 6, and more stable double winding can be produced.

In addition, when the openings W1m and 2m are joined by brazing, double-winded openings W & 3 are joined by dissimilar metals, which is likely to cause corrosion due to battery action. In step 3, it was necessary to perform anti-corrosion treatment again. On the other hand, in the manufacturing method of the present invention, the mouth portion 1 of the inner cylinder l
Since the & is folded back to sandwich the mouth 2 & of the outer cylinder 2 and further caulked watertight, moisture etc. will not adhere to the welding surface 10 of the mouth 3, and the double wind has excellent corrosion resistance of the mouth Wh3. Become something. Therefore, according to this manufacturing method, the mouth part 3 of the double wind
There is no need to apply anti-corrosion treatment again, and manufacturing costs can be reduced. Also, the inner cylinder.

Since the opening edge of the outer cylinder 2 is covered by the folding of the opening N1m of l, only the surface is made of a clad material made of a material with excellent corrosion resistance (for example, a stainless steel clad steel plate). Even if you try to reduce the cost by creating tube 2,
There is no need to apply anti-corrosion treatment to the opening edge of the outer cylinder 2 where a material with poor corrosion resistance is exposed.

"Other Embodiments of the Invention" Figures 4 to 7 are for explaining other embodiments of the present invention, and are the same as the metal expanded double bottle shown in Figures 1 to 3. The same reference numerals are given to the constituent parts to simplify the explanation.

FIG. 4 shows a vacuum insulated cooking container manufactured by the method of the present invention.

This vacuum insulated cooking container has an inner cylinder l and a side wall 1c of an outer cylinder 2.
A vacuum heat insulating layer 9 is formed between L and 2f1, and the bottom 1e of the inner cylinder 1 and the bottom 2e of the outer cylinder 2 are integrally joined. This heat insulating container is manufactured by folding back the opening 2a of the outer cylinder 2 extending radially outward and inserting the opening 1& of the inner cylinder 10 extending beyond the opening edge 2b of the opening 2&. , by forming the mouth 3 of the insulated container.

FIGS. 5 to 7 each show the mouth portion 3 of a double-breasted metal bottle manufactured by the manufacturing method of the present invention.

The mouth part 3 of the metal double bottle shown in FIG. 5 is manufactured as follows. In this example, first, the opening 1& of the inner cylinder 10 is formed to extend radially outward, and the opening W2a of the outer cylinder 2 is formed to extend radially outward along the opening 1alC. At the same time, the mouth portion 2a of the outer cylinder 2 is formed to extend beyond the opening edge 1b of the inner cylinder l. It is desirable that the extending portion 6 of the mouth portion 2 & of the outer cylinder 2 be bent upward by approximately 90 degrees in advance. Thereafter, the opening 11a of the inner cylinder 1 and the joint [5, of the opening N2& of the outer cylinder 2] are overlapped and welded together. Next, the extending portion 6 of the outer cylinder 2 is also folded back so as to wrap around the opening la of the inner cylinder 1, and then caulked.

The double wind opening 3 shown in FIG. 6 is formed by forming the opening 2& of the outer cylinder 2 into a tapered shape that gradually slopes upward and outward, and connecting the opening l& of the inner cylinder 1 to the opening 1& of the outer cylinder 2. It is formed by a tapered joint part 5 along the mouth part 2& and an extending part 6 and k which gradually inclines outward toward the bottom. It is manufactured by folding and caulking the extending portion 6 of Wla so as to wrap around the mouth 2& of the outer cylinder 2, and sandwiching the mouth 2& of the outer cylinder 2 from the mouth 1ahC of the inner cylinder 1.

The double wind opening 3 shown in FIG. 7 forms an opening l& of the inner cylinder 10 so as to be inscribed in the opening 2a of the outer cylinder 2 extending upward.
After bending the extending portion 6 of the mouth portion 1a of the inner cylinder l outward in the radial direction, the inner and outer cylinders 1 and 2 are assembled.
It was manufactured by welding and joining the mouth parts 1&, 2& of the inner cylinder mouth part 2a, then bending and caulking the extending part 6 of the inner cylinder mouth part 2a, and holding the outer cylinder mouth part 152m from the inner cylinder mouth part ZalC.

Even with these manufacturing methods, the same effects as the above-described manufacturing methods can be obtained.

"Effects of the Invention" As explained above, according to the method for manufacturing a gold M4 double bottle of the present invention, the opening of either the inner cylinder or the outer cylinder can be are joined and integrated in a state where it extends outward beyond the opening edge of the other opening, and then the extended portion of one opening is folded back so as to wrap around the edge of the other opening. Since the double wind is manufactured from above, there is no need to finish the mouth of the double wind with a lathe or polishing, and the problem of deformation of the mouth during finishing is eliminated.

Therefore, if the inner thickness of the inner cylinder or outer cylinder is made thinner, the heat retention performance will be improved, so even the production of double-sided wind, which has a lower strength at the opening, can be produced efficiently with high yield. .

Moreover, since the manufactured double wind is formed by the bent portion of the extended portion of the mouth end surface, the double wind is safe, has a good appearance, and has high commercial value.

Furthermore, the manufactured double-wind opening has improved strength because the bent extensions are overlapped, so it is difficult to deform even if subjected to impact during use. , double wind can maintain good appearance quality for a long period of time.

Furthermore, according to this manufacturing method, since the joint where the inner and outer cylinders are joined is covered by the bent extension part,
It is difficult for moisture etc. to enter this part, so even if the mouth is joined by a welding method such as brazing, which is prone to corrosion due to battery action, there is no need to apply anti-corrosion treatment to this mouth 1S&C. It is possible to significantly reduce manufacturing costs.

[Brief explanation of the drawing]

Figures 1 to 3 show all 1I4J units manufactured according to one embodiment of the present invention! ! This shows a wide-mouthed thermos flask. Fig. 1 is a partially sectional front view of the entire thermos flask, Fig. 2 is a sectional view of the main parts showing the state in which the mouths of the inner and outer cylinders are joined, and Fig. 5 is an extended view. FIG. 4 is a cross-sectional view of the main part showing the state of the mouth portion with the protruding portion bent, FIG. 7th
The figures are cross-sectional views showing the main parts of the double-sided air bottle manufactured by the method of the present invention, and Figures 8 and 9 are wide-mouthed metal thermos flasks manufactured by the conventional method. FIG. 9 is an enlarged view of section A in FIG. 8, which is a partially sectional front view. 1... Inner cylinder, la... Mouth, lb...
...-Opening edge, 2... Outer cylinder, 2 &...
...Mouth, 2b...Opening edge, 3...
Mouth part, 6...extending part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 8 Figure 9

Claims (1)

[Claims] When manufacturing a metal double bottle by joining and integrating a metal inner cylinder and a metal outer cylinder at the mouth, first, the mouths of the inner cylinder and the outer cylinder are connected to either the inner cylinder or the outer cylinder. One mouth part is joined and integrated with the other mouth part extending outward beyond the opening edge of the other mouth part, and then the extended part of one mouth part is wrapped around the edge part of the other mouth part. A method for producing a metal double bottle characterized by folding it back like this.