JP2002066674A - Manufacturing method for aluminum threaded container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for an aluminum threaded container which does not impair the inside coating of the mouth. SOLUTION: An outer piece 7 pushes mouths 3, 4, 5 toward the inner piece 6 side in between the inner piece 6 inserted in the mouths 3, 4, 5 of an aluminum container 1 to process the inside of the mouths 3, 4, 5 by rolling processing and the outer piece 7 to process the outside of the mouths 3, 4, 5 by rolling processing, and the inner piece 6 pushes the mouths 3, 4, 5 toward the outer piece 7 side, the mouths 3, 4, 5 are put between the inside and outside pieces 6, 7 to cut a thread on the mouths 3, 4, 5 of the aluminum container 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a threaded aluminum container, and more particularly to a method for manufacturing a threaded aluminum container which does not damage the mouth of the container, especially the inner surface coating of the mouth.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a screwed aluminum container, there is a manufacturing method shown in FIGS.
For example, there is a technique disclosed in JP-A-5-229545. FIG. 10 is a cross-sectional view showing the aluminum container 50 in which the opening 52 is formed by drawing at the opening of the aluminum container 50 via the tapered shoulder 51. FIG. 11 is a cross-sectional view showing the aluminum container 50 in which the mouth 53 is formed by further drawing the mouth 52.

FIG. 12 is a cross-sectional view in which a threaded portion 54a of an inner piece 54 for screw processing is brought into contact with an inner peripheral surface of a mouth portion 52. Mouth 52
To the opening 52 with the threaded portion 55a of the outer piece 55.
Into the mouth 52, so that a screw 56
Is formed.

[0004]

However, in such a conventional invention, the inner piece 54 is simply provided by the mouth 52.
The operation of forming a screw is performed only by the operation of the threaded portion 55a of the outer piece 55 pushing the opening 52 toward the inner piece 54 (FIG. 1).
4). In this case, since the moving distance X from only one direction of the outer piece 55 is large, the retroactive deformation of the Z portion shown in FIG. And the inner surface coating film of this Z part cracks,
There is a disadvantage that peeling or the like occurs.

In such conventional screw forming, since the root diameter of the screw portion 56 is substantially equal to the outer diameter of the mouth portion 53 (see FIG. 13, dimension B), the thus formed mouth portion is formed. As shown in FIG. 15, when the cap 57 is screwed into the portion, there is a disadvantage that the sealing performance between the cap 57 and the tip of the mouth 53 becomes insufficient. That is, since it is impossible to seal the distal end portion of the mouth portion 53 with the packing from the vertical direction and the horizontal direction, there is a possibility that the contents may leak.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem. When an opening of an aluminum container is screwed, the inner coating film of the opening does not crack or peel off. It is an object of the present invention to provide a method for manufacturing an aluminum container with a screw, and a method for manufacturing a screwed aluminum container with a diameter of a screw portion and a diameter of a mouth capable of completely sealing the cap and the tip of the mouth.

[0007]

Means for Solving the Problems In order to solve this problem, a solution according to the first aspect of the present invention includes an inner piece inserted into a mouth of an aluminum container and rolling the inside of the mouth. , Between the outer piece that rolls the outside of the mouth, the outer piece pushes the mouth toward the inner piece,
The inner piece is a method for manufacturing a screwed aluminum container, characterized in that the mouth is pushed into the outer piece, the inner and outer pieces sandwich the mouth, and the mouth of the aluminum container is threaded. .

In order to solve this problem, a solution corresponding to the second aspect of the present invention is to provide a step of pre-drawing the mouth portion before the screw forming rolling process, in the step of drawing from the shoulder of the aluminum container. The mouth is drawn to at least two or more steps, and the mouth of the second step from the tip is sandwiched between the inner piece and the outer piece, and the mouth of the aluminum container is subjected to screw processing. This is a method for manufacturing a screwed aluminum container.

In order to solve this problem, a solution according to the third aspect of the present invention is to provide a method in which the root diameter (B) of the screw of the mouth is larger than the outer diameter (C) of the mouth. It is a screwed aluminum container characterized by being performed.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 8 according to the present invention,
It is drawing which shows 1st Embodiment of the manufacturing method of the aluminum container with a screw. 1 to 3 show a pre-processing step of applying a screw process to a mouth portion of a threaded aluminum container. FIG. 1 shows a process of forming a mouth portion 3 at an opening via a tapered shoulder 2. FIG. 1 is a cross-sectional view showing an aluminum container 1 that has been subjected to a drawing process. Next, FIG. 2 is a cross-sectional view showing the aluminum container 1 in which the opening 4 is formed by further drawing the tip of the drawn opening 3. FIG. 3 is a cross-sectional view showing a case where the redrawing process is performed on the tip of the mouth portion 4 to form the mouth portion 5. That is, in the pre-processing step of the mouth portion of the aluminum container 1 according to the present invention, a mouth portion that has been subjected to drawing processing in three stages of the mouth portion 3, the mouth portion 4, and the mouth portion 5 is formed.

Next, FIGS. 4, 7 and 8 are views showing a manufacturing process for forming a screw at the mouth of a threaded aluminum container according to the present invention. That is, the inner piece 6 is inserted into the mouth 4 of the aluminum container 1 and
An outer piece 7 is rotatably provided on the outer periphery of the. As shown in FIG. 7, the inner piece 6 revolves around the inner periphery of the mouth 4 while rotating, and the outer piece 7 rotates while being synchronized with the inner piece 6. Revolves along. That is,
The feature of the present invention is, as shown in FIG.
The screw 8 is formed such that the mouth 4 is sandwiched between the inner piece 6 and the outer piece 7 from the initial position (the position of 0 in FIG. 6) by a distance Y from each other. is there.

Next, according to the first embodiment, in the first working step of the screw working, the opening of the aluminum container 1 is sequentially reduced in three steps with the opening 3, the opening 4 and the opening 5 in the pre-processing step. Then, as shown in FIG. 5, a screw 8 is formed with the outer diameter of the screw being E, the root diameter of the screw being B, and the intermediate diameter of the screw being M, as shown in FIG. Then, as shown in FIG. 5, the outer diameter dimension C of the mouth portion 5 whose diameter has been reduced to the smallest diameter is characterized by being located inside the root diameter dimension B of the screw by a dimension H.

Next, the operation of the present invention will be described.
The present invention is different from the conventional forming method in which the inner piece simply contacts the inner peripheral surface of the mouth to support the mouth, and only the outer piece moves to perform screw forming. As shown, inner piece 6
And the outer piece 7 move mutually by a distance Y, and the inner piece 6 and the outer piece 7
Since the screw 8 is formed so as to be sandwiched between them, the retroactive deformation of the portion W shown in FIG. 6 is reduced, and cracking and peeling of the inner surface coating film at the portion W can be prevented.

Further, as shown in FIG. 9, when the tip curl portion 5a is formed in the mouth portion 5 formed by the manufacturing method according to the present invention and the cap 9 is screwed, the outer diameter of the mouth portion 5 is reduced. Since there is a difference in dimension H between C and the root diameter dimension B of the screw, a space is formed on the side of the tip curl portion 5a. By forming this space, packing can be provided not only on the inside of the top surface of the cap 9 but also on the side surface of the cap 9. Then, the packings 10 and 10a can seal the front curl portion 5a of the mouth portion 5 so as to wrap the curl portion 5a vertically and horizontally. In particular, in the case of a screwed aluminum container having a curled portion at the tip, such a horizontal seal is an essential condition.

[0015]

As described above, according to the present invention, it is possible to prevent cracks, peeling, and the like from occurring in the inner coating film of the screw portion of the mouth portion during screw processing. Since a dimensional difference (H) is provided between the outer diameter of the mouth and the root diameter of the screw, when a cap is screwed into the screw, the sealing effect of the cap has a very good effect.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a pre-processing step of applying a thread according to the present invention;
Sectional drawing which shows the state which formed the mouth part by the drawing process.

FIG. 2 is a diagram illustrating a pre-processing step for performing thread processing according to the present invention;
Sectional drawing which shows the state which shape | molded the mouth part by the drawing process in two steps.

FIG. 3 is a diagram illustrating a pre-processing step of performing thread processing according to the present invention;
Sectional drawing which shows the state which formed the mouth part in three steps by drawing.

FIG. 4 is a longitudinal sectional view showing a screw working step according to the present invention.

FIG. 5 is an enlarged vertical sectional view showing a screw working step according to the present invention.

FIG. 6 is a longitudinal sectional view showing a state in which a mouth portion is sandwiched between an inner piece and an outer piece in a screw processing step according to the present invention.

FIG. 7 is a cross-sectional view showing a screw processing step according to the present invention.

FIG. 8 is a longitudinal sectional view showing a screw working step according to the present invention.

FIG. 9 is a cross-sectional view showing a state in which a cap is screwed into a mouth manufactured by screw processing according to the present invention.

FIG. 10 shows a conventional pre-processing step for performing thread processing.
Sectional drawing which shows the state which formed the mouth part by the drawing process.

FIG. 11 is a diagram illustrating a conventional pre-processing step for performing screw processing;
Sectional drawing which shows the state which shape | molded the mouth part by the drawing process in two steps.

FIG. 12 is a longitudinal sectional view showing a conventional screw processing step.

FIG. 13 is a longitudinal sectional view showing a conventional screw processing step.

FIG. 14 is a longitudinal sectional view showing a state in which a mouth portion is sandwiched between an inner piece and an outer piece in a conventional threading process.

FIG. 15 is a cross-sectional view showing a state where a cap is screwed into a mouth manufactured by conventional screw processing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aluminum container 2 Shoulder 3 4 5 Mouth 6 Inner piece 7 Outer piece

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Claims (3)

[Claims] Claims: 1. An aluminum container is inserted into a mouth of an aluminum container,
Between the inner piece that rolls the inside of the mouth and the outer piece that rolls the outside of the mouth, the outer piece pushes the mouth into the inner piece, and the inner piece pushes the mouth into the outer piece. A method for manufacturing an aluminum container with a screw, characterized in that the opening is sandwiched between the inner and outer pieces, and the opening of the aluminum container is subjected to a screw process. 2. In a step of pre-drawing the mouth before the screw forming rolling, the mouth is drawn in at least two or more steps from the shoulder of the aluminum container, and a part of the second step from the tip is formed. 2. The method for manufacturing a threaded aluminum container according to claim 1, wherein the mouth is sandwiched between an inner piece and an outer piece, and the mouth of the aluminum container is subjected to threading. 3. A threaded aluminum container, wherein the root diameter (B) of the screw at the mouth is larger than the outer diameter (C) of the mouth.