JPH06269891A - Production of vessel with bottom - Google Patents

Abstract

PURPOSE:To provide a producing method of a vessel with a bottom with a simple structure, without dividing a producing process and with an excellent quality of an out-look. CONSTITUTION:This producing method of a vessel with a bottom is made so that a blank 5 is attached in a cavity 6 of a die 3, and the blank is plastically deformed by pressing a punch 4 being made freely and relatively movable against the die 3 to the blank 5. Then, a positional constraint part 8 where the positional deviation of the blank or the punch 4 is prevented to any direction orthogonally crossing against the pressing direction of the punch 4, and these blank 5 and punch 4 are constricted at the proper position is formed on each opposing surface 7 of each pressing direction of the die 3, the blank 5 and the punch 4, and the blank 5 is plastically deformed in one motion while mutually and closely fitting the respective positional constraint parts 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bottomed container in which a blank is plastically deformed by using a punch and a die, and more particularly to a bottomed container suitable for manufacturing a long bottomed container. The present invention relates to a method for manufacturing a container.

[0002]

2. Description of the Related Art Generally, a bottomed container manufacturing method for manufacturing a bottomed container by plastically deforming a blank using a punch and a die is widely used for reasons such as high production efficiency. .

As an example of such a conventional method of manufacturing a bottomed container, a method of manufacturing a flat nickel cadmium battery battery case used in a small portable cassette tape player will be described with reference to FIG.

9A to 9H show a method of manufacturing a battery case as an example of a conventional method of manufacturing a bottomed container.

As the battery case, as shown in FIG. 9A, a disc 1 made of a suitable material such as stainless steel, aluminum or aluminum alloy is used as the blank 1. Then, the blank 1 is gradually deformed plastically in stages as shown in b to g of FIG. 9 by using eight kinds of punches and dies (not shown).
Through, the desired battery case 2 shown in FIG. 9h is formed.

[0006]

However, in the above-described conventional method for manufacturing a bottomed container, forming the blank 1 in the battery case 2 requires as many as eight divided manufacturing steps. It takes time and effort,
There is a problem in that a dedicated punch and die are required for each process, which imposes a heavy economic burden.

Further, as described above, the blank 1 is gradually plastically deformed in multiple steps to form a finished product through the intermediate deformable body 1a, so that the surface of the finished product is streaked and the appearance quality is improved. There was a problem of deterioration.

The present invention has been made in view of these points, and overcomes the above-mentioned problems with the conventional ones.
An object of the present invention is to provide a method of manufacturing a bottomed container having a simple structure and excellent appearance quality without dividing the manufacturing process.

[0009]

In order to achieve the above-mentioned object, a method for manufacturing a bottomed container according to the present invention is such that a blank is mounted in a cavity of a die and a punch movable relative to the die is blanked. In the method of manufacturing a bottomed container in which the blank is plastically deformed by pressing, the die, the blank, each facing surface of the pressing direction of the punch, in any direction orthogonal to the pressing direction of the punch To prevent the blanks and the punches from being displaced relative to each other and to constrain these blanks and punches to proper positions, and to move the blanks in one operation while closely fitting the respective position-constraining portions. It is characterized by being plastically deformed.

[0010]

According to the method for manufacturing a bottomed container of the present invention having the above-mentioned structure, the position restraint portions formed on the respective facing surfaces of the die, the blank and the punch in the pressing directions are closely fitted to each other. While doing so, the blank can be plastically deformed in one operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

This embodiment is an embodiment in which the bottomed container manufacturing method according to the present invention is applied to a battery case of a flat nickel cadmium battery used in a portable cassette tape player which is as small as a conventional one. FIG. 1 is an explanatory view showing a state where a blank is mounted on a die, FIG. 2 is an explanatory view showing a state where a punch is in contact with the blank, and FIG. 3 is an explanatory view showing a state where a battery case is completed. FIG. 4 is a perspective view showing the battery case.

An outline of the method for manufacturing a bottomed container of this embodiment will be described. As shown in FIG. 1, a die 5 and a punch 4 are used to mount a blank 5 in a cavity 6 of the die 3 and then, As shown in FIG. 2, the punch 4 that is movable relative to the die 3 is driven to face the facing surfaces 7 a, 7 a of the punch 4, the blank 5, and the die 3 in the pressing direction.
b, 7c, 7d formed on the respective position restraint portions 8a, 8b, 8
While closely fitting the c and 8d together, as shown in FIG. 3, the punch 4 is pressed against the blank 5 in one operation so that the blank 5 is pushed out from the gap G between the die 3 and the punch 4. By plastically deforming, as shown in FIG. 4, a long bottomed battery case 9 having a long side of 16 mm, a short side of 5 mm, a length of 65 mm, and a wall thickness of about 0.4 mm is formed.

Next, the method of manufacturing the bottomed container of the above-mentioned embodiment will be described in more detail together with its operation.

First, the blank will be described with reference to FIGS.

FIG. 5 is an explanatory view showing an example of a method of manufacturing a blank block which is a base of a blank, where a is a bar and b is a plate. FIG. 6 shows an example of a blank, a is a perspective view, b is a side sectional view, and c is a bottom view.

As the blank 5 for manufacturing the battery case 9, as shown in FIG. 5a, a bar member 10 made of aluminum or aluminum alloy and having a rectangular cross section is cut, or the blank 5 shown in FIG. As shown in FIG. 6B, the material block 12 obtained by punching the flat plate material 11 is subjected to press molding or the like (not shown) to
As shown in FIGS. 1 to c, a rectangular parallelepiped having a predetermined shape is used.

As shown in FIGS. 6A to 6C, the blank 5 as a whole is formed into a rectangular parallelepiped having a long side of 16 mm, a short side of 5 mm and a height of 14 mm. Then, in the processing state, the concave portion 13 is inserted into the facing surface (hereinafter, referred to as punch facing surface) 7b of the blank 5 that faces the punch 4 in the pressing direction so that the tip end portion of the punch 7 is closely fitted in the processed state. Is formed, and the recess 1 is formed in the recess 13.
Cross-shaped convex portions 14 each having an intersection at the center of gravity of 3 and extending in a direction parallel to either the long side or the short side of the blank 5 have a substantially semicircular cross section. The cross-shaped convex portion 14 has a height of, for example, 0.0 as shown in FIG.
The width is about 3 mm and the width is about 0.2 mm.

The concave portion 13 and the cross convex portion 14 form a position restraining portion 8b of the punch facing surface 7b.

Further, a flat rectangular concave portion 15 having a center at the center of gravity is formed on a facing surface (hereinafter referred to as a die facing surface) 7c which faces the die 3 of the blank 5 in the pressing direction. As shown in FIG. 6C, the concave portion 15 has, for example, a long side of 9 mm and a short side of 3 m.
m and the depth is about 0.03 mm. A position restraining portion 8c of the die facing surface 7c is formed by the concave portion 15.

Next, the die and punch will be described with reference to FIGS.

FIG. 7 is a front view of the front surface of the punch, and FIG. 8 is a plan view of the cavity portion of the die.

The die 3 and the punch 4 which are paired to manufacture the battery case 9 are in a state in which the axis C in the pressing direction is matched with an appropriate molding machine such as a press (not shown) (FIG. 1). It is arranged in.

An opposing surface (hereinafter referred to as the punch front surface) 7 that faces the blank 5 of the punch 4 in the pressing direction.
As shown in FIG. 7, a cross-shaped concave portion 16 closely fitted to the cross-shaped convex portion 14 formed on the punch facing surface 7b of the blank 5 has an intersection point at the center of gravity of the punch front surface 7a. The cross-shaped concave portion 16 forms the position restraining portion 8a of the punch front surface 7a.

Further, as shown in FIG. 8, on the bottom surface of the cavity 6 of the die 3 which is the facing surface (hereinafter referred to as blank facing surface) 7d facing the blank 5 of the die 3 in the pressing direction, as shown in FIG. A convex portion 17 that closely fits the concave portion 15 formed on the die facing surface 7c is formed so as to have its center at the center of gravity of the die facing surface 7d. Face 7
A position restraining portion 8d of d is formed.

Each of the position restraint portions 8a, 8b, 8C, 8d
Is for preventing offset of the punch 4 and the blank 5 with respect to the axis C and displacement in any direction orthogonal to the pressing direction such as rotation of the blank 5 with respect to the axis C.

Next, the operation of manufacturing the battery case using the above-mentioned die, blank and punch will be described in more detail.

To manufacture the battery case 9 with the die 3 and the punch 4 using the blank 5, the punch 4 and the die 3 are separated from each other, and the axial center C of the pressing direction is the same. It is installed in the state where it is made. And
As a lubricant, for example, the blank 5 to which sodium stearate is attached is placed in the cavity 6 so that the die facing surface 7c of the blank 5 faces the blank facing surface 7d of the die 3 as shown in FIG. Mounting. Then,
The concave portion 15 of the position restraint portion 8c formed on the die facing surface 7c of the blank 5 and the convex portion 17 of the position restraint portion 8d formed on the facing surface 7d of the die 3 are closely fitted, It is possible to reliably prevent the displacement in any direction orthogonal to the pressing direction.

Next, in this state, the punch 4 is moved toward the blank 5. Then, as shown in FIG.
First, the punch front surface 7a is the punch facing surface 7b of the blank 5.
Fits into the recess 13 of the position restraint 8b formed in
It is possible to reliably prevent the displacement in any direction orthogonal to the pressing direction. Next, the cross-shaped concave portion 16 of the position restraint portion 8a on the front surface 7a of the punch is replaced by the punch-facing surface 7b of the blank 5.
It is possible to tightly fit the cross-shaped convex portion 14 of the position restraining portion 8b formed in the above, and to prevent the positional displacement in any direction orthogonal to the pressing direction more reliably. That is,
The gap G (FIGS. 2 and 3) between the die 3 and the punch 4 formed in the direction orthogonal to the pressing direction can be uniformly maintained over the entire circumference.

Then, as shown in FIG. 3, with the position restraining portions 8a, 8b, 8c and 8d engaged, the punch front surface 7a is moved to a desired position on the punch facing surface 7b of the blank 5 in one operation. Battery case 9 (Fig. 4) by pushing
Is completed.

As described above, according to this embodiment, the punch 4
And facing surfaces 7a, 7b, 7 of the blank 5 and the die 3
c, 7d are formed with position restraint portions 8a, 8b, 8c, 8d for restraining them at proper positions, and the respective position restraint portions 8a, 8b, 8c, 8d are closely fitted to each other, thereby pressing. It is possible to reliably prevent displacement in any direction orthogonal to the direction. This makes it possible to maintain the uniformity of the wall thickness of the product formed by the gap G between the die 3 and the punch 4 with high accuracy, and thus the bottomed container having a longer length than the wall thickness of the product. Can be easily manufactured.

Further, according to this embodiment, since the product can be manufactured by pushing the punch 4 to the desired position in the blank 5 in one operation, the surface condition of the product is made uniform and the appearance quality is improved. Can be made. Since the pair of dies 3 and punch 4 can manufacture the product in one operation, the manufacturing process is simplified,
It is possible to surely reduce the economic burden and surely improve the production efficiency.

In this embodiment, the punch front surface 7
The cross concave portion 16 is formed on a and the cross convex portion 14 is formed on the punch facing surface 7b of the blank 5, but the punch front surface 7a
Alternatively, the cross convex portion 14 may be formed on the surface of the blank 5, and the cross concave portion 16 may be formed on the punch facing surface 7 b of the blank 5. Further, the shapes of the cross-shaped convex portion 14 and the cross-shaped concave portion 16 are not hemispherical in cross section, and various shapes such as a mountain cross section can be selected. Further, a cross convex portion 14 and a cross concave portion 16 are formed on the punch front surface 7a and the punch facing surface 7b of the blank 5,
Although the positional displacement in the direction orthogonal to the pressing direction was prevented, the cross concave portion 16 was formed on the convex portion 17 of the facing surface 7d of the die 3, and the cross convex portion 14 was formed on the die facing surface 7c of the blank 5. However, the shape is not particularly limited to the shape of this embodiment.

Further, a cross concave portion 16 is formed on the punch front surface 7a of the punch 4, and a cross convex portion 14 is formed on the punch facing surface 7b of the blank 5, so that both 11 and 13 are closely fitted in the processed state. This is particularly effective in preventing positional displacement due to rotation of the blank in a direction orthogonal to the pressing direction when manufacturing a cylindrical bottomed container.

Further, the present invention is not limited to the above embodiment, but can be modified as necessary.

[0036]

As described above, according to the method for manufacturing a bottomed container of the present invention, it is possible to efficiently manufacture a bottomed container having excellent appearance quality and dimensional accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state in which a blank is attached to a die in a manufacturing process for manufacturing a battery case according to the method for manufacturing a bottomed container according to the present invention.

FIG. 2 is a view similar to FIG. 1 showing a state where a punch is in contact with a blank.

FIG. 3 is a view similar to FIG. 1, showing a completed battery case.

FIG. 4 is a perspective view showing an entire battery case manufactured according to the method for manufacturing a bottomed container according to the present invention.

5A and 5B are explanatory views showing an example of a method of manufacturing a material block which is a basis of a blank of a battery case manufactured according to the method of manufacturing a bottomed container according to the present invention.

6A to 6C show an example of a blank of a battery case manufactured by the method for manufacturing a bottomed container according to the present invention, in which a is a perspective view, b is a side sectional view, and c is a bottom view.

FIG. 7 is a front view of the front of the punch.

FIG. 8 is a plan view of a cavity portion of the die.

9A to 9H are explanatory views illustrating a manufacturing process of a battery case manufactured according to a conventional method of manufacturing a bottomed container.

[Explanation of symbols]

 3 Dice 4 Punch 5 Blank 6 Cavity 7a, 7b, 7c, 7d Opposing surface 8a, 8b, 8c, 8d Position restraining part 9 Battery case 13 Recessed part 14 Cross convex part 15 Recessed part 16 Cross recessed part 17 Convex part C axis Heart G gap

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H01M 2/02 A

Claims (1)

[Claims] 1. A method for manufacturing a bottomed container, wherein a blank is mounted in a cavity of a die, and a punch movable relative to the die is pressed against the blank to plastically deform the blank. The blank and the punch are positioned on the respective facing surfaces in the respective pressing directions to prevent the blank and the punch from being displaced in any direction orthogonal to the pressing direction of the punch, and to position the blank and the punch in proper positions. A method for manufacturing a bottomed container, which comprises forming a position restraint portion for restraining, and plastically deforming the blank in one operation while closely fitting the position restraint portions to each other.