JPH1024343A - Manufacture of container with bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain a high precision container. SOLUTION: The position restraining part 8a of a punch 4 is formed on the front face 7a of the punch 4; at least the center part is made the most projecting top in the pressurizing direction; the outer circumferential surface is formed with a projection 17 formed on a planar surface; the position restraining part 8b of a blank 5 is formed on the surface 7b oppositely facing the punch 4, and is formed by a recessed part 13 that can be engaged with the projection 17.

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 bottomed container in which a blank is plastically deformed by using a punch and a die, and is particularly suitable for manufacturing a bottomed container having a long length in one operation. And a method for manufacturing a bottomed container.

[0002]

2. Description of the Related Art In general, a method of producing a bottomed container by plastically deforming a blank using a punch and a die to produce a bottomed container is frequently used for reasons such as high production efficiency. .

FIGS. 13A to 13H show a method of manufacturing a battery case of a flat nickel cadmium battery used in a small portable cassette tape player as an example of a conventional method of manufacturing a bottomed container. As shown in FIG. 13 (a), the conventional battery case uses a disk 1 made of a suitable material such as stainless steel, aluminum, an aluminum alloy or the like as a blank. Then, as shown in FIGS. 13 (b) to 13 (g), the blank 1 is gradually plastically deformed in stages using seven types of punches and dies (not shown). Thus, a battery case 2 as a desired product shown in FIG. 13H is formed.

[0004]

However, in the above-mentioned conventional method for manufacturing a bottomed container, the manufacturing process of dividing the blank 1 into the battery case 2 requires seven divided steps. Takes time and effort,
There is a problem that a dedicated punch and a die are required for each process, and the economic burden is large.

As described above, since the blank 1 is gradually plastically deformed in multiple steps and is made into a finished product via the intermediate deformed body 1a, streaks and scratches are generated on the surface of the finished product. There was a problem that the appearance quality deteriorated.

In order to solve such a problem, the present applicant has disclosed in Japanese Patent Application Laid-Open No. Hei 6-26991 a method of mounting a blank in a cavity of a die, and inserting a punch movable relatively to the die. In the method of manufacturing a bottomed container in which the blank is plastically deformed by pressing the punch, the die, the blank, and each of the opposing surfaces in the pressing direction of the punch, in any direction orthogonal to the pressing direction of the punch. Forming a position restraint portion for preventing the displacement of the blank and the punch to prevent the blank and the punch at an appropriate position,
A method for manufacturing a bottomed container characterized in that the blank is plastically deformed in one operation while the respective position restraining parts are closely fitted to each other. More specifically, the position restricting portion formed on the opposing surface between the punch and the blank is formed by a cross concave portion formed on the front surface of the punch and a cross convex portion formed on the punch opposing surface of the blank. Have been.

According to the method of manufacturing a bottomed container adopting such a configuration, a product can be manufactured by pressing a punch into a blank by a single operation to a desired position. It can be uniform and the appearance quality can be improved. Furthermore, since the product can be manufactured with one operation by a pair of dies and punches, the manufacturing process is simplified, the economic burden is reliably reduced, and the production efficiency can be reliably improved. . In addition, the die, the blank, the position restraint portion formed on each opposing surface in the pressing direction of each of the punch, reliably prevent displacement in any direction perpendicular to the pressing direction, the die and the punch Since the uniformity of the wall thickness of the product formed by the gap can be maintained with high precision, it is possible to easily manufacture a bottomed container having a long length with respect to the wall thickness of the product. is there.

By the way, the performance of various devices in recent years has always been improved, and with the performance of various devices, a flat nickel cadmium battery or the like used for a small portable cassette tape player has been developed. Higher precision products are also required for bottomed containers.

Conventionally, in the manufacture of bottomed containers, the upper edge (opening edge) of the product wall after plastically deforming the blank has a large wavy shape, so that the height of the wall is uniform. In addition, it is necessary to remove a greatly wavy portion of the upper edge of the wall in a later process, and there is a problem that the yield of the material is not good.

The present invention has been made in view of the above points, and provides a method of manufacturing a bottomed container which can easily obtain a high-precision product and can improve the yield of raw materials. The purpose is to:

[0011]

In order to achieve the above-mentioned object, the present applicant has conducted research on a method of manufacturing a bottomed container capable of obtaining a product with higher precision and a higher yield of material. It has been found that the shape of the position restraining portion formed on the opposing surface of the punch and the blank greatly contributes to making the height and wall thickness of the wall rising from the gap between the die and the punch uniform, and completed the present invention. It is a thing.

That is, a feature of the method for manufacturing a bottomed container according to the present invention described in claim 1 is that a blank pressed by a punch is mounted in a cavity of a die, and the die, the blank, A position constraint that prevents the blank and the punch from being displaced in any direction perpendicular to the pressing direction of the punch on each opposing surface in the pressing direction of the punch, and restricts the blank and the punch to an appropriate position. Manufacturing a bottomed container that forms a part and presses a punch made movable relative to the die against the blank while tightly fitting the respective position restraining parts to each other, and plastically deforms the blank in one operation. The method according to claim 1, wherein the position restraining portion of the punch is formed on a front surface of the punch, the top portion having at least a central portion most protruding in a pressing direction. Is the outer peripheral surface is formed by protrusions formed on the smooth surface is, the position restraining portions of the blank, is formed on the surface facing the punch lies in the projection is formed by fitting recess capable.

[0013] The method of manufacturing a bottomed container according to the present invention described in claim 2 is characterized in that, in claim 1, the top portion is a line segment and the outer peripheral surface is formed by a plurality of planes. It is in the point which did.

[0014] The method of manufacturing a bottomed container according to the present invention described in claim 3 is characterized in that, in claim 1, the top portion is a line segment and the outer peripheral surface is formed by at least one curved surface. It is in the formed point.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a bottomed container according to the present invention, wherein the top is curved and the outer peripheral surface is formed by a plurality of planes. On the point.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a bottomed container according to the present invention, wherein the top is curved and the outer peripheral surface is formed by at least one curved surface. It is in the point which did.

Further, a feature of the method for manufacturing a bottomed container according to the present invention described in claim 6 is that, in claim 1, the outer peripheral surface is formed by a plurality of planes with the top as a point. On the point.

[0018] By adopting such a configuration, the opposing surface of the punch and the blank can be made smooth, and as a result, the gap between the die and the punch when the blank is plastically deformed can be reduced. Since the top of the plastically deformed blank can be made smooth and uniform, it is possible to easily obtain a product with higher wall height and wall thickness after plastically deforming the blank, and The yield of the material can be improved.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings.

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

The outline of the method of manufacturing a bottomed container according to the present embodiment will be described. As shown in FIG. 1, a die 3 and a punch 4 are used, and a blank 5 is formed in a cavity 6 of the die 3.
After that, the punch 4 which is relatively movable with respect to the die 3 is driven, and the opposing surfaces 7 in the pressing direction of the punch 4, the blank 5 and the die 3, as shown in FIG.
a, 7b, 7c, and 7d, each of the position constraint portions 8a, 8
While the b, 8c and 8d are closely fitted to each other, the punch 4 is pressed against the blank 5 by one operation as shown in FIG.
Is extruded from the gap G between the die 3 and the punch 4 in a direction opposite to the pressing direction of the blank 5, as shown in FIG. 4, 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. A long bottomed battery case 9 is formed.

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

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

FIGS. 5A and 5B are explanatory views showing an example of a method of manufacturing a material block serving as a base of a blank. FIG. 5A shows a case where a bar material is used and FIG. 5B shows a case where a plate material is used. FIG.
1 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 10 having a rectangular cross section made of a material such as aluminum or an aluminum alloy is cut. As shown in FIG. 5 (b), a substantially rectangular parallelepiped material block 12 obtained by punching a flat plate material 11 is shown in FIGS. 6 (a) to 6 (c) by press molding or the like (not shown). As described above, a rectangular parallelepiped formed in a predetermined shape is used.

As shown in FIGS. 6A to 6C, the blank 5 has a long side of 16 mm and a short side of 5 m as a whole.
m, a rectangular parallelepiped having a height of 14 mm. And
In the processing state, the front end portion (punch front surface 7a) of the punch 7 is inserted into an opposing surface (hereinafter, referred to as a punch opposing surface) 7b of the blank 5 which opposes the punch 4 in the pressing direction so as to fit tightly. Recess 13 is formed. The shape of the recess 13 corresponds to the shape of a protrusion 17 formed on the punch front surface 7a, which will be described later. In the present embodiment, as shown in detail in FIG. 7a is a plane 1 having four inclined surfaces
4, a flat rectangular shape having a projection area substantially the same as that of the punch front surface 7a. The shape viewed from the long side forms an inverted trapezoid, and the shape viewed from the short side forms an inverted triangle. At least the central portion, which is the center of gravity of the punch-facing surface 7b, is formed in a substantially inverted wedge-like polygonal shape having the deepest line segment in the pressing direction.

A rectangular frame-shaped flat surface 15 substantially equal to the gap G between the die 3 and the punch 4 is formed on the periphery of the punch facing surface 7b.

The recess 13 forms a position restricting portion 8b of the punch facing surface 7b of the present embodiment.

A flat rectangular recess 16 having a center at the center of gravity is formed on an opposing surface (hereinafter referred to as a dice opposing surface) 7c of the blank 5 which faces the dice 3 in the pressing direction. As shown in FIGS. 6B and 6C, the concave portion 16 has, for example, a long side 9.
mm, short side 3 mm and depth 0.03 mm. The concave portion 16 forms a position restricting portion 8c of the die facing surface 7c.

Next, the dies and punches 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 of the die.

The die 3 and the punch 4 which are paired to manufacture the battery case 9 are set 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.

As shown in FIG. 7, the blank 5 of the punch 4
A protrusion 17 is formed on an opposing surface (hereinafter, referred to as a punch front surface) 7a opposing in the pressing direction as a position restricting portion 8a that closely fits into a recess 13 formed in the punch opposing surface 7b of the blank 5. ing. The shape of this projection 17 is
The outer peripheral surface 21 of the punch front surface 7a extending from each side of the punch front surface 7a is formed such that the shape when viewed from the long side is a trapezoid and the shape when viewed from the short side is a triangle.
The punched front surface 7 is formed by two inclined flat surfaces 18.
The center of gravity of at least the center of a is a top portion 20 composed of a protruding line segment having the highest height in the pressing direction, and is formed in a generally wedge-like polygonal shape as a whole. The projection 17 forms a position restricting portion 8a of the punch front surface 7a.

That is, the position restricting portion 8a of the punch 4 of the present embodiment is formed on the punch front surface 7a of the punch 4 and has at least a central portion formed of a line segment of a desired length most protruding toward the pressing direction. The outer peripheral surface 21 composed of the four planes 18 is constituted by a protrusion 17 formed as a smooth surface.

As shown in FIG.
On the bottom surface of the cavity 6 of the die 3 which is an opposing surface (hereinafter referred to as a blank opposing surface) 7d opposing in the pressing direction, the concave portion 16 formed on the die opposing surface 7c of the blank 5 is closely fitted. The rectangular parallelepiped convex portion 19 has
The die 17 is formed so as to have a center at the position of the center of gravity of the die facing surface 7d, and the convex portion 17 forms a position constraint portion 8d of the blank facing surface 7d.

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

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

In order to manufacture the battery case 9 from 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 axes C in the pressing direction coincide with each other. It is arranged in the state where it was made to be. And
As shown in FIG. 1, a blank 5 on which sodium stearate is adhered as a lubricant is placed in the cavity 6 such that the die facing surface 7 c of the blank 5 faces the blank facing surface 7 d of the die 3. Mounting. Then
The concave portion 16 of the position restricting portion 8c formed on the die facing surface 7c of the blank 5 and the position restricting portion 8 formed on the blank facing surface 7d on the bottom surface of the cavity 6 of the die 3.
d is tightly fitted to the convex portion 19, and the displacement in any direction perpendicular to the pressing direction can be reliably prevented.

Next, the punch 4 is operated toward the blank 5 in this state. Then, as shown in FIG.
First, the position restricting portion 8a formed on the front surface 7a of the punch
The position restraining portion 8b in which four inclined planes 18 of the projecting portion 17 are formed on the punch facing surface 7b of the blank 5
The projection 17 and the recess 13 are fitted to each other by contacting the four inclined planes 14 of the recess 13, and displacement in any direction perpendicular to the pressing direction can be reliably prevented. That is, the gap G (FIGS. 2 and 3) between the die 3 and the punch 4 formed in a direction perpendicular to the pressing direction can be uniformly maintained over the entire circumference.

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

As described above, according to the present embodiment, the opposing surfaces 7a, 7b, 7 of the punch 4, the blank 5, and the die 3
The position restraining portions 8a, 8b, 8c, 8d for restraining each of them at appropriate positions are formed in the positions c, 7d, and the position restraining portions 8a, 8b, 8c, 8d are closely fitted to each other, so that pressing is performed. The displacement in any direction orthogonal to the direction can be reliably prevented. 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, so that the bottomed container having a longer length than the wall thickness of the product. Can be easily manufactured. Further, a protrusion 1 having an outer peripheral surface formed into a smooth surface
7, it is possible to make the height of the wall of the product uniform, reduce the waving of the upper edge (opening edge) of the wall, and improve the yield of the material.

According to the present embodiment, a product can be manufactured by pressing the punch 4 into the blank 5 in one operation to a desired position, so that the surface condition of the product is uniform and the appearance quality is improved. Can be improved. Since the product can be manufactured in one operation by the pair of the die 3 and the punch 4, the manufacturing process is simplified, the economical burden is surely reduced, and the production efficiency is surely improved. Can be.

Furthermore, in the present embodiment, when the blank 5 is plastically deformed to form a product, the punch front surface 7a and the punch facing surface 7b are both formed smoothly, so that the die 3 and the punch 3 In this way, the plastically deformed blank 5 is reliably and smoothly raised from the gap G with the blank 4, that is, there is no obstacle along the deformation direction of the blank 5, so that the deformation of the blank 5 is not suppressed and the smoothness is improved. As a result, the wall thickness of the wall rising from the gap G between the die 3 and the punch 4 is made more uniform, and the height of the wall is made more uniform, so that the upper edge of the wall is wavy. Can be reliably reduced, high-precision products can be easily obtained, and the yield of materials can be reliably improved. Kill.

The recess 13 provided on the punch-facing surface 7b of the blank 5 includes an outer peripheral surface 2 of the projection 17 formed on the punch front surface 7a when the projection 17 contacts the recess 13.
1 is configured such that a part of the front end side of each flat surface 18 is fitted into the concave portion 13, that is, the width of the flat surface 15 in the form of a square frame formed on the punch facing surface 7a of the blank 5 of the present embodiment. The projection area of the recess 13 may be made smaller than the projection area of the projection 17 formed on the front surface 7a of the punch.

The shape of the projection 17 as the position restricting portion 8a formed on the front surface 7a of the punch is as follows.
A shape in which at least a central portion is a top portion 20 that protrudes most in the pressing direction and an outer peripheral surface 21 is formed as a smooth surface, for example, a top portion 2 shown in FIGS. 9 (a) and 9 (b).
0 is a line segment, the outer peripheral surface 21 is formed by at least one curved surface, the top 20 shown in FIGS. 10A and 10B is a curved line, and the outer peripheral surface 21 is formed by a plurality of planes. Top 20 shown in 11 (a) and (b)
Is a curve, and the outer peripheral surface 21 is formed by at least one curved surface, and the outer peripheral surface 21 is formed by a plurality of planes with the top 20 shown in FIGS. 12A and 12B as a point. Various shapes can be selected according to the concept and the type of blank 5 and the like. The same effect as in the above-described embodiment can be obtained by forming the shape of the projection 17 as the position restraining portion 8a formed on the front surface 7a of the punch into the shape shown in FIGS. When the shape shown in FIGS. 9 to 12 is used as the shape of the projection 17, the recess 1 is used.
It is important to form the shape 3 according to the shape of the projection 17.

The method for producing a bottomed container according to the present invention can naturally be applied to the production of various beverage containers such as beer cans.

Further, the present invention is not limited to the above-described embodiment, and can be changed as needed.

[0048]

As described above, according to the method for manufacturing a bottomed container of the present invention, a highly accurate bottomed container excellent in appearance quality and dimensional accuracy can be efficiently manufactured, and the yield of raw materials can be improved. Is extremely improved.

[Brief description of the drawings]

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

FIG. 2 is a view showing a state in which a punch is in contact with a blank.
Figure similar to

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

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

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

6A to 6C show an example of a battery case blank manufactured according to the method for manufacturing a bottomed container according to the present invention, wherein FIG. 6A is a perspective view, FIG. 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.

FIGS. 9A and 9B show another example of a projection as a position restraining portion of the punch, wherein FIG. 9A is a front view,
(B) is a side view

FIGS. 10 (a) and (b) show still another example of a projection as a position restricting portion of a punch, where (a) is a front view and (b) is a side view.

FIGS. 11A and 11B show still another example of a projection as a position restraining portion of a punch;
(A) is a front view, (b) is a side view.

FIGS. 12 (a) and (b) show still another example of a projection as a position restricting portion of a punch;
(A) is a front view, (b) is a side view.

13 (a) to 13 (h) 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]

 Reference Signs List 3 die 4 punch 5 blank 6 cavity 7a, 7b, 7c, 7d opposing surface 8a, 8b, 8c, 8d position restraining portion 9 battery case 13 concave portion 16 concave portion 17 projecting portion 19 convex portion 20 top portion 21 outer peripheral surface C axis center G gap

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H01M 2/02 H01M 2/02 A

Claims (6)

[Claims] 1. A blank to be pressed by a punch is mounted in a cavity of a die, and a surface of the die, the blank, and the punch, which faces each of the pressing directions, is provided in any direction orthogonal to the pressing direction of the punch. Forming a position restraining portion that prevents the blank and the punch from being displaced to each other and restrains these blanks and the punch at an appropriate position, and makes the respective position restraining portions closely fit each other with respect to the die. In a method for manufacturing a bottomed container in which a relatively movable punch is pressed against a blank and the blank is plastically deformed in one operation, the position restraining portion of the punch is formed on the front surface of the punch and at least the center portion is pressed. A top portion that is most protruded toward the direction and is formed by a protrusion that has an outer peripheral surface formed as a smooth surface, and the position constraint portion of the blank, Manufacturing method of the bottomed container is formed on the surface facing the serial punch the projection is characterized in that it is formed by fitting recess capable. 2. The method for manufacturing a bottomed container according to claim 1, wherein the top portion is a line segment, and the outer peripheral surface is formed by a plurality of planes. 3. The method according to claim 1, wherein the top portion is a line segment, and the outer peripheral surface is formed by at least one curved surface. 4. The method for producing a bottomed container according to claim 1, wherein the top portion is curved, and the outer peripheral surface is formed by a plurality of planes. 5. The method for manufacturing a bottomed container according to claim 1, wherein the top portion is curved, and the outer peripheral surface is formed by at least one curved surface. 6. The method for producing a bottomed container according to claim 1, wherein the outer peripheral surface is formed by a plurality of planes with the top as a point.