JPH0970361A - Manufacture of double container made of metal - Google Patents

Abstract

PURPOSE: To provide a method for manufacturing a double container made of a metal in which the manufacturing process is extremely simplified and the manufacturing cost, expenditures for a mold and an installation are remarkably reduced and the working efficiency is improved and mass-productivity is remarkably improved by preparing two parts such as an inner bottle and an outer bottle of the double container of one thin sheet in one working process without manufacturing separately the inner bottle and the outer bottle as in the conventional method. CONSTITUTION: A bottom part (h) is fixed on one opening part of a pipe-like cylindrical base body (g) prepd. by welding and fixing together both edge part of a sheet material (f) to form a cylindrical body (i) with a bottom and in addition, on the cylindrical base body (j) prepd. by expanding the pipe from another opening part side by a required amt. so as to make the diameter into two states, spinning processing is applied on the surrounding of the boundary between different diameters to perform draw deformation processing of this part (k) furthermore into a smaller diameter and after a specified shape is formed, the part (k) prepd. into a smaller diameter by the draw deformation processing is divided into two parts to form simultaneously the inner bottle A and the outer bottle B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a double container having heat insulation and vacuum properties, such as a metal thermos, a mug, a lunch jar, which is used for keeping cold and keeping warm.

[0002]

2. Description of the Related Art Taking the most popular metal double thermos as an example, in the conventional method, as shown in FIG. 1, for the inner bottle A of the double container, first, both edges of the metal thin plate material are joined. It is welded to form a pipe-shaped cylindrical base body a, the peripheral surface is subjected to press working to reduce and expand the pipe, and the upper mouth is necked to a required shape by spinning. A bottom lid b formed separately from this is fitted into the bottom opening of the cylindrical base body a and welded and fixed to form the inner bottle A.

Also, for the outer bottle B, both edges of the metal thin plate are welded together to form a pipe-shaped cylindrical base body c, and the peripheral surface shape of a short cylinder formed separately from this is prescribed. The mouth member d deformed and formed into a shape by press working,
It is formed by fitting and welding to the cylindrical base body c, or by deforming the upper peripheral surface of the cylindrical base body c into a predetermined shape to form a mouth portion, as shown in FIG. Insert the inner bottle A through the bottom opening of the outer bottle B (cylindrical substrate c) into
A bottom lid e is fitted in the bottom opening, welded and fixed, and vacuum processed to manufacture a vacuum double bottle.

[0004]

However, in the conventional method, the inner bottle and the outer bottle have to be manufactured separately, which complicates the processing process, and the processing cost and the die cost / equipment cost used for the processing are reduced. Due to the large number of processing steps, cost reduction and rationalization are difficult, and recently cost competitiveness with overseas has reached the limit.

Despite the demand for weight reduction from the viewpoint of cost and functionality, extremely thin plate materials due to the welding structure are difficult in terms of welding technology, and there is no choice but to use plate materials having a certain thickness or more. From the aspect, cost reduction and functional improvement are significantly hindered.

It is an object of the present invention to find such a problem in the conventional method for manufacturing a metal double container such as a thermos bottle, and to provide a manufacturing method for solving this problem.

[0007]

The gist of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 3, a bottomed cylinder is formed by fixing a bottom part h to one opening on a pipe-shaped cylindrical base g in which both edges of a plate f are fixed by welding. A cylindrical base body j is formed by forming a body i and expanding the diameter of the body from the other opening side by a required amount in two steps. Spinning is applied to the periphery of the boundary where the diameters are different. A method for manufacturing a double container made of metal, which is characterized in that the inner bottle A and the outer bottle B are formed at the same time by dividing the portion k, which has been drawn and deformed into a predetermined shape, into a predetermined shape, and then is divided into two parts from the portion k which has been drawn and deformed into the small diameter. It is related to.

Further, as shown in FIG. 4, a bottom part h is fixed to a pipe-shaped cylindrical base g by welding and fixing both edges of a plate f to a bottom part by fixing it to one opening. The cylindrical body i is formed, and further expanded from the other opening by a necessary amount to have a diameter in two stages. A cylindrical base body j is further subjected to a treatment for thinly extending the necessary peripheral surface of the body to form a body portion. A long cylindrical body n having a thin peripheral surface is formed, and a boundary peripheral surface having a different diameter is subjected to spinning processing, and this portion k is further drawn and deformed to a smaller diameter, and then formed into a predetermined shape, and then drawn to the smaller diameter. The method according to claim 1, wherein the deformed portion k is divided into two parts to form the inner bottle A and the outer bottle B at the same time.

Further, as shown in FIG. 5, a bottom part h is fixed by fixing a bottom part h to one opening on a pipe-shaped cylindrical base g on which both edges of a plate f are fixed by welding. The cylindrical body i is formed, and the cylindrical base body j is expanded from the other opening side so that the diameter becomes two steps in the required amount. After forming a long cylindrical body n having a thin peripheral surface and dividing it into two parts from a boundary part having a different diameter, each divided opening k is subjected to spinning processing or the like to form an inner bottle A and an outer bottle B, respectively. The present invention relates to the method for manufacturing a double metal container according to claim 1, wherein the double container is formed.

[0011]

A bottomed cylinder is formed by welding and fixing, for example, a shallow drawing component (bottom component h) by welding from one side of the opening of the pipe-shaped cylindrical base body g to which both edges of one plate material f are welded together. A body i is formed, and a cylindrical base body j is formed by expanding the diameter from the opposite opening side by a necessary amount in two steps. For example, in the case of a small volume product, the diameter is as shown in FIG. After forming a long cylindrical body n by performing a spinning process around different boundaries, or for a product with a large capacity, performing a process (handling process) of further thinning a bottomed cylindrical body as shown in FIGS. , Around the boundary with different diameter is subjected to spinning processing, further drawn and deformed to a smaller diameter, formed into a predetermined shape and then divided into two to form the inner bottle A and the outer bottle B at the same time, or the diameter is different in two steps The long cylindrical body n is first divided into two, and then each opening k Subjected to such spinning to form respectively as the inner bin A out bin B.

[0012]

[Embodiment] In this embodiment, a thin plate material f made of metal (iron, aluminum, shell, stainless steel, titanium, etc.) is processed and formed.

In this embodiment, as shown in FIG. 3, FIG. 4 and FIG. 5, a shallow drawing is made from one side of the opening to a pipe-shaped cylindrical base body g in which both edges are welded together. Part h
(Bottom part h) is welded and fixed to form a bottomed cylindrical body i, and the diameter of the bottomed body i is adjusted in two steps from the opening side (opening on the opposite side) to the required amount. In order to form an expanded bottomed cylindrical base body j, and in FIG. 3, the periphery of boundaries having different diameters is formed into a predetermined shape having a smaller diameter, spinning is performed to simultaneously form the opening joint portion k of the inner bottle A and the outer bottle B. Then, it is divided into two parts, the inner bottle A and the outer bottle B are fitted from the same direction, the openings are joined, and the outer bottom m of another component is fitted and fixed, for example, a double container as shown in FIG. 6 is completed. To do.

Further, in FIG. 4, after forming the bottomed cylindrical substrate j,
Further, processing to thinly extend the required part of the body peripheral surface (handling processing)
(In the present embodiment, both the small-diameter portion and the large-diameter portion except for the bottomed portion were subjected to processing for thinning the body peripheral surface) to form a thin body peripheral surface to increase the volume. The long cylindrical body n is formed, and the boundary peripheral surfaces having different diameters are subjected to spinning to simultaneously form the opening joint portion k of the inner bottle A and the outer bottle B, and then divided into two to complete a double container. In addition, in FIG. 5, a long cylindrical body n having a thin outer peripheral surface in FIG. 4 is formed.
Is first divided into two, and each opening k is subjected to a spinning process or the like to form each as an inner bottle A and an outer bottle B, and similarly a double container is completed.

[0015]

According to the present invention, unlike the conventional example, the inner bottle and the outer bottle are not separately manufactured, and two parts of the inner bottle and the outer bottle of the double container can be processed from one thin plate at one time. The manufacturing process is extremely simplified, and the manufacturing cost, mold cost, and equipment cost are significantly reduced, work efficiency is improved, and mass productivity is dramatically improved.

Further, in terms of welding technology, it is possible to weld a relatively thick plate material which is easily welded to form a cylindrical base body, and then to thin the peripheral surface of the body portion, so that the weight is greatly reduced as compared with the conventional case. As a result, functionality such as material cost saving and weight saving is significantly improved.

Further, in the invention of claim 2, even a bottomed cylindrical substrate made of the same single plate material can be easily processed into a bottle having a predetermined shape depending on the extent to which it is extended. In the second aspect, the opening can be processed after cutting according to the processing conditions, and the above-mentioned effects are exhibited and the practicality is further excellent.

[Brief description of drawings]

FIG. 1 is a process procedure diagram of an inner bottle and an outer bottle of a double container such as a thermos bottle according to a conventional method.

FIG. 2 is a cross-sectional view of a completed double container such as a thermos according to a conventional method.

FIG. 3 is a process procedure diagram of an inner bottle outer bottle of the first embodiment (embodiment according to the invention of claim 1).

FIG. 4 is a process procedure diagram of an inner bottle and an outer bottle according to a second embodiment (an embodiment according to the invention described in claim 2).

FIG. 5 is a process procedure diagram of an inner bottle and an outer bottle according to a third embodiment (an embodiment according to the invention of claim 3).

FIG. 6 is a sectional view of a completed state of the double container according to each example.

[Explanation of symbols]

 A Inner bottle B Outer bottle f Plate material g Cylindrical base body h Bottom part i Cylindrical body j Cylindrical base body k part, opening n Long cylindrical body

Claims (3)

[Claims] 1. A pipe-shaped cylindrical base body in which both edges of a plate material are welded and fixed to each other, and a bottom part is fixed to one opening to form a bottomed cylindrical body. From the opening side of the tube, expand the cylindrical substrate so that the diameter has two stages by the required amount, spin around the boundary where the diameter is different, and squeeze and deform this part to a smaller diameter to form the specified shape. After that, the method for producing a metal double container is characterized in that the inner bottle and the outer bottle are formed at the same time by dividing the portion that has been deformed by drawing into the small diameter into two parts. 2. A bottomed cylindrical body is formed by fixing a bottom component to one opening of a pipe-shaped cylindrical base body in which both edges of a plate material are welded to each other, and the other is formed. The cylindrical base body expanded from the opening of the body to the required amount in two stages has a long cylindrical body with a thin outer peripheral surface that has been thinned to further reduce the peripheral surface of the body. Formed, spinning the boundary peripheral surface with different diameters, drawing and deforming this part to a smaller diameter, forming into a predetermined shape, then dividing into two parts from the part that has been drawn and deformed to the smaller diameter The method for manufacturing a metal double container according to claim 1, wherein the bottle is formed at the same time. 3. A pipe-shaped cylindrical base body in which both edge portions of one plate material are welded and fixed to each other, and a bottom part is fixed to one opening portion to form a bottomed cylindrical body. A long cylindrical body in which the body circumference is thinned by subjecting the cylindrical base body expanded from the opening side of the body to a diameter in two steps to the required amount, and further subjecting the necessary body circumference to a thin extension 2. The metal-made metal bottle according to claim 1, wherein each of the divided openings is formed into an inner bottle and an outer bottle after being divided into two parts from a boundary part having a different diameter, and then each divided opening part is subjected to a spinning process or the like. Manufacturing method of heavy container.