JPS61193730A - Production of deformed can - Google Patents

Abstract

PURPOSE:To deform a metallic can and to form simply and easily a deformed can by drawing respectively the vicinity of the opening part of bottomed cylindrical metallic can and the vicinity of the bottom part and by making the body part in elliptical shape with pressing in the radial direction under the state thereof. CONSTITUTION:The vicinity of the opening part 2 of a bottomed cylindrical metallic can 1 and the vicinity of the bottom part 3 are subjected to drawings D1, D2 from the upper and lower parts respectively and the body part 8 is made in elliptical shape by the press work E in radial direction of the body part 8 under the state thereof. The bottom cylindrical metallic can 1 is plastically deformed easily with simple jig and technique without any buckling and made in the prescribed shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing deformed cans. More specifically, the present invention relates to a method for deforming metal cans used for aerosol products and food packaging containers.

[Prior Art] Conventional aerosol cans have only been produced in cylindrical shapes due to long-standing legal restrictions and ease of production.

However, in the case of aerosol products for cosmetics, for example, it is desirable to improve the design by making various changes to the appearance, such as unifying the design with other containers such as glass containers.

Methods for deforming metal cans include, for example, adding various mechanisms and devices to the impact molding mold to form a deformed can at the time of impact molding, and bulge molding (using urethane rubber etc. inside the metal can). Possible methods include the magnetic wave forming method (a method in which a metal can is placed inside a split mold, a coil is inserted into the metal can, and the coil is expanded from the inside).

[Problems to be Solved by the Invention] All of the above-mentioned processing methods require expensive and complicated equipment, and there are problems in that the degree of deformation is small.

An object of the present invention is to provide a processing method that can easily apply a relatively large deformation that can give a high design effect to a metal can.

[Means for Solving the Problems] The method for manufacturing a deformed can of the present invention involves drawing the outer periphery of a bottomed cylindrical metal can near the opening and near the bottom,
The structural feature is that the body is then subjected to a pressing process in which it is pressed in the radial direction to deform it into an elliptical cross-section.

In the manufacturing method of the deformed can of the present invention, the rigidity of the can is increased by applying a drawing process to the outer periphery of the shoulder and bottom portion in advance, and the body is made to protrude outward from other parts, and then the body is Because the pressing process is performed to press the parts in the radial direction, the flattened curved surface is smooth and easy to mold.

Furthermore, when drawing the shoulder and bottom into a cylindrical shape and forming a tapered part that smoothly continues between that part and the body, the continuity of the curved surface in the final shape becomes smooth. There are advantages.

[Example code] Next, the manufacturing method of the present invention will be explained with reference to the drawings.

Fig. 1 is a step explanatory drawing showing one embodiment of the manufacturing method of the present invention, Fig. 2 is a process explanatory drawing showing another embodiment of the manufacturing method of the present invention, and Figs. FIGS. 4 and 5 are cross-sectional views of main parts showing examples of metal cans subjected to the curling process, and process explanatory views showing other examples of drawing in the manufacturing method of the present invention, and FIGS.
8 is an explanatory view showing an example of the pressing process in the present invention, and FIGS. 9 and 10 are a perspective view and a partially cutaway plan view showing an example of a deformed can manufactured by the manufacturing method of the present invention, respectively. 11 and 12 are side views of the modified can of FIG. 9, respectively.

Figure 1 shows an example of the method for manufacturing deformed cans of the present invention, from a bottomed cylindrical aluminum can (1) (so-called aluminum monoblock can) to deformed cans for aerosol products. The state of progress is shown in the order of the steps.

First, the can (1) is subjected to a drawing process (Dl), (Dl) to narrow the outer circumference near the opening (a) and the bottom (3).

The drawing process (Dl), (Dl) can be performed by a conventionally known method, for example, using a drawing die (4), (5) and a knockout plate (6), (sword, etc.).The drawing process (01) , (Dl) may be performed first, and other processing, such as necking processing or curling processing to be described later, may be performed between the drawing processing (01) and (opening 2).

Next, a pressing process (E) in which the body (8) of the can (1) is pressed from two directions facing each other (direction of arrow (Q))
will be applied. The pressing process (E) is the opening (a and bottom (3)
It is preferable to carry out this while supporting the can (1) in the axial direction (in the direction of the arrow (R) in FIGS. 6 and 7) so that the can (1) does not stretch.

The can (1) subjected to the pressing process (E) becomes a deformed can (21) having an elliptical cross-sectional shape, for example, as shown in FIGS. 9 to 12.

In the manufacturing method of the present invention, drawing processes (Dl) and (Dl) are performed in the vicinity of the opening (2) and the bottom (3), respectively, before the pressing process (E) is performed. Therefore, only the body (8), which protrudes outward and has relatively low rigidity compared to other parts, is pressed and deformed. Therefore, pressing is easy, and a smooth and accurate surface shape can be obtained even though no supporting member is inserted inside the can (1).

In the manufacturing method of the present invention, as shown in FIG. It is preferable to increase the rigidity of the opening (2) by, for example, the opening (2) of the can (1) obtained by impact extrusion (A).
Compared to the case where the drawing process (Dl) is performed directly on a, there is an advantage that the drawing process (opening 1) is simpler and distortion is less likely to occur.

Also, even if necking (B) is applied to form the neck (9) and shoulder 0, the drawing process on the opening (2) side (
01) becomes easier.

In FIG. 2, (11) is a mold, and (12) is a pilot.

When manufacturing aerosol cans, curling processing (
C) is the edge (2a) of the opening (2) as shown in Figure 3a.
) are usually wound outward, but may also be wound inward. In addition, in the case of metal food cans such as juice cans, a curling process (C) is performed to form a flange part (2b) with a U-shaped cross section that opens outward, as shown in Figure 3b. Good too. Further, after the curling process, processing such as making the curled portion flat may be performed.

In the drawing process (03) of the shoulder ■ shown in Fig. 4, a cylindrical portion (14) is formed on the shoulder ■;
and a smoothly continuous taper portion (15) are formed at the same time.

When forming such a tapered portion (15), the curved surface formed by the pressing process (E) (for example, (16) and (17) in FIG. 9) and the constricted portion (18) should be It has the advantage that it continues extremely smoothly.

Note that the same effect can be obtained even if a cylindrical portion (14) and a tapered portion (15) are formed near the bottom portion (3).

In the drawing process of the bottom part [6] shown in FIG.
A second drawing process (D6) is performed to simultaneously form the tapered portion (14) and the tapered portion (15).

When drawing is performed in two steps in this manner, the highly rigid bottom portion (3) can be processed relatively easily. In addition, in the first drawing process (D5), the bottom surface (20
) is pressed in the direction of arrow (P) with a mold of an appropriate shape, etc., which has the advantage that processing can be performed more easily and wrinkles and cracks are less likely to occur.

If necessary, rAW4 oil may be applied to the surface of the can (1) before or during the drawing process. This reduces the frictional force between the mold and the can surface, reducing processing pressure and protecting the printing etc. on the can surface. The lubricating oil is washed out after the final drawing or pressing process.

The pressing process (E) in the present invention is performed, for example, as follows.

First, the curling part (24) and bottom part (3) of the can (1) are held using jigs (22) and (23) as shown in FIG. In that case, the jigs (22), (23) are held so that the distance between them does not increase.

Next, a set of molds (26) having a curved inner surface (25) as shown in FIG.
Q) Press in direction. Thereby the body (8) of the can (1)
deforms into an elliptical cross-section as shown by the two-dot chain line (S) in FIG.

The shapes of the jigs (22) and (23) may be such that they simply support the curling part (24) and the bottom part (8) from the outside as shown in FIG. 6, but, for example, as shown in FIG. A jig (27) and a bottom surface (20) having a protrusion (26) in contact with the inner periphery of the curling part (24) as shown in FIG.
Preferably, it is constituted by a jig (28) in contact with the whole of the. This not only prevents the can (1) from stretching in the axial direction, but also prevents the can (1) from elongating in the axial direction.
Undesirable deformation (for example, distortion) in the vicinity can be prevented.

By manufacturing according to the above method, for example, Nos. 9 to 11
As shown in the figure, on the pressed side (16), the shoulder (to) and the torso (8) are directly and smoothly connected,
On the side (17) that was not pressed, the shoulder (roll),
A graceful deformation in which the constricted part (18) and the body part (8) are smoothly continuous with each other, and the side surfaces (16) and (17) are smoothly continuous with each other, and the body part (8) and the bottom part (3) are smoothly continuous. Can (21) can be obtained.

That is, the deformed can (21) manufactured by the manufacturing method of the present invention is
The curved surfaces, each having a different curvature, are integrally molded so that they are smoothly continuous with each other. Therefore, the deformable can (21) has high strength and pressure resistance, and can be suitably used as a container for, for example, an aerosol product.

The material of the bottomed cylindrical metal can processed by the manufacturing method of the present invention is not only aluminum but also copper, brass, iron,
Or alloys based on these metals, surface treatments (plating, oxide film forming, etc.) on these metals, etc.
Various metals that can be plastically worked can be mentioned.

Although impact extrusion is preferred as a method for forming a bottomed cylindrical shape, other conventionally known methods such as deep drawing and spatula drawing may also be used.

[Effects of the Invention] According to the method for manufacturing a deformed can of the present invention, a relatively large deformation can be easily applied to a metal can, thereby easily manufacturing a metal can with high design and practicality. .

[Brief explanation of drawings]

Fig. 1 is a process explanatory diagram showing one embodiment of the manufacturing method of the present invention, Fig. 2 is a process explanatory diagram showing another embodiment of the manufacturing method of the present invention, and Figs. 3a and 3b are each related to the present invention. 4 and 5 are process explanatory diagrams showing other embodiments of the drawing process in the manufacturing method of the present invention, and FIGS. 6 to 8 are respectively sectional views of main parts showing examples of metal cans subjected to curling processing. 9 and 10 are a perspective view and a partially cutaway plan view, respectively, of an example of a deformed can manufactured by the manufacturing method of the present invention, and FIG. and FIG. 12 are side views of the modified can of FIG. 9, respectively. (Main symbols in the drawing) (Dl), (D2): Molding (E): Pressing (1): Can (2): Opening (3): Bottom (8): Body; i'3a7 ;t'3bll174 figure 5 figure 760 77 figure

Claims (1)

[Claims] 1. A drawing process is applied to the outer periphery of a bottomed cylindrical metal can near the opening and near the bottom, and then a pressing process is performed in which the body is pressed in the radial direction to deform it into an elliptical cross-section. A manufacturing method for deformed cans. 2 Claims in which the drawing process consists of a process of drawing the shoulder and bottom part into a cylindrical shape, and a process of drawing a part continuous to the part drawn into the cylindrical shape into a taper shape that smoothly continues with the body part. The manufacturing method described in paragraph 1. 3. The manufacturing method according to claim 1, wherein the pressing is performed while supporting the vicinity of the opening and the bottom of the metal in the axial direction.