JPS6188932A - Manufacture of deformed can - Google Patents

Abstract

PURPOSE:To provide compratively large deformation to a metallic can for enhancing its decorative effect by necking and curling the neighborhood of the opening of a cylindrical, bottomed metallic can in sequence before drawing the body of can from its one end toward the other end. CONSTITUTION:The opening part 2 of an Al can 1 formed into a bottomed, cylindrical shape by impact extrusion A is drawn into a prescribed diameter (d2) by a pilot 3 and a die 5 in a necking stage B before curling C the neck part of can 1. In a drawing D stage, the body 6 of can 1 is provided with the 1st-3rd drawing works D1-D3 to make the body slender from its opening part 2 to its bottom 8 in sequence. Then a bottom-corner rounded taper can 1 whose base part is spreaded gradually toward the bottom 12, is obtained. In this way, a deformed can excellent in decorative effect, is manufactured by providing comparatively large deformation thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing deformed metal cans. For more details,
This 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 deformed cans at the time of impact molding, and bulge molding (using urethane rubber, etc., to form metal cans). method of inserting it into a can, compressing it, and then pushing it out from the inside), or magnetic wave forming method (
Possible processing methods include placing a metal can inside a split mold, inserting a coil inside the metal can, and expanding it from the inside.

[Problems to be Solved by the Invention] All of the above-mentioned processing methods require expensive and complicated installation and leakage, 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 allows a metal can to be easily subjected to a relatively large deformation with a high design effect.

[Means for Solving the Problems] The method for manufacturing a deformed can of the present invention involves necking and curling the vicinity of the opening of a bottomed metal can, and then necking and curling the metal can from one end toward the other. Its structural feature is that the body is drawn.

Note that curling in this specification refers to not only the case where the edge (2a) of the opening (2) is completely rounded into a circular cross section as shown in FIG. The concept also includes so-called flange processing, which involves rolling the material into a shape.

[Function] In the method for manufacturing a deformed can of the present invention, after necking process,
A curling process is first applied to the edge of the opening. This increases the strength and rigidity of the can.

Therefore, when drawing the side surface, there is no need to insert a pilot ((3) in FIG. 1) into the interior of the metal can, unlike in normal necking.

Furthermore, the coating film on the inner or outer surface of the metal can is not pressed too hard, and the burden on the coating film is reduced.

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

FIG. 1 is a process explanatory diagram showing one embodiment of the manufacturing method of the present invention, FIGS. 2 and 3 are process explanatory diagrams showing other embodiments of drawing in the manufacturing method of the present invention, and FIGS. 5
The reasons are as follows, partially cutaway side view showing an embodiment of a metal can subjected to a curling process according to the present invention, Nos. 6 to 1.
FIG. 1 is a partially cutaway side view showing an example of a deformed can manufactured by the method of the present invention.

Figure 1 shows an embodiment of the method for manufacturing a deformed can of the present invention, in which an aluminum can (1) (so-called aluminum The process from block cans to deformed cans for aerosol products is shown in the order of steps.

The can (1) is first subjected to necking process (B).
The pilot (3) is inserted into the opening (2), and the area around the opening (21) is squeezed to the desired thickness with the mold (4), simultaneously forming the shoulder (5). The width of 5, that is, the difference between the diameter (dl) of the original body (6) and the diameter (d2) of the neck (sword), is selected depending on the number of punches in the drawing process I (D) described later. .Also necking process (B
) can be processed using conventionally known molds and presses, and if a wide shoulder part (5) is required, it can be processed several times so that the diameter (d2) of the neck part (7) gradually becomes thinner. The necking process (B) is repeated.

Next, the neck portion (7) is subjected to a curling process (C). When manufacturing aerosol cans, the curling process (C) is applied to the opening (edge of 2a) as shown in Figure 4.
) 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) may be performed to form a flange part (shaped like a sword) that opens outward and has a U-shaped cross section, as shown in Figure 5. Furthermore, after the curling process, a process such as making the curled part flattened may be performed.

The can (1) that has been subjected to the curling process (C) is the can (1)
A drawing process (0) is performed to gradually narrow the body (6) from the end on the opening (2) side toward the bottom (8).

In the case of Fig. 1, the first drawing process (Dl) and the second drawing process (o2) are applied to almost the entire body part (6) except for the vicinity of the bottom part (8).
Then, a third drawing process (D2) is performed, and finally a tapered hem (11) that gradually widens toward the hem (9) as shown in FIG. 8 is formed.

In this case, the presence of the bottom portion (12) makes it difficult for distortion to occur in the shape of the hem portion (9).

In addition, when the processing is completed by the first drawing process (Dl) or the second drawing process (o2), a bottle type (13) resembling a glass bottle as shown in FIG. 6 is formed.

Figure 2 shows the drawing process (D) in the manufacturing method for deformed cans of the present invention.
This shows another example, which can be adopted in place of the first to third drawing processes (Dl), (02), and (03) of the manufacturing process steps shown in FIG.

In the drawing process shown in Fig. 2, in the first drawing process (D4),
First, the body (6) of the can (1) is squeezed from the opening (2) side to make it one step thinner to the vicinity of the bottom (8), and then the second drawing process (
D5) and the third drawing process (06) are performed while changing the drawing depth to form a plurality of step portions (14) that become gradually thinner upward. As a result, a bamboo-shaped deformed can (15) as shown in FIG. 7, for example, can be formed.

In the manufacturing method of the present invention shown in Figs. 1 and 2, drawing is performed from the opening (a side), but the manufacturing method of the deformed can of the present invention is not limited thereto; 8) Drawing may be performed from the side.

FIG. 3 shows a preferred embodiment in which drawing is performed from the bottom (8) side of the can (1). i.e. the bottom (
8) has a bottom plate (12), so it is relatively difficult to perform the drawing process all at once. Therefore, as shown in Fig. 3, a first drawing process (16) is performed to temporarily form a tapered part (16) near the bottom (8) and to curve and deform the bottom plate (12).
07), and then perform a second drawing process (D8) in which the vicinity of the bottom part (8) of the body part (6) is drawn into a cylindrical shape.

In addition, in the first drawing process (07), the bottom plate (12) may be deformed by pressing it toward the opening (a side).By employing the drawing processes (07) and (D8) shown in FIG. The vicinity of the bottom (8) of (1) can also be modified with a relatively high degree of design, for example, the bottom drawer can (1) shown in FIG.
7) etc. can be easily formed.

In the manufacturing method of the present invention, lubricating oil may be applied to the surface of the can (1) as necessary before or during the drawing process. This reduces the vibration force between the mold and the can surface, reducing processing pressure and protecting the printing etc. on the can surface. The oil is washed after the final drawing process.

According to the manufacturing method of the present invention, various deformed cans as shown in FIGS. 6 to 9 can be easily manufactured by individually employing the drawing processes shown in FIGS. 1 to 3.

Furthermore, if the drawing processes shown in FIGS. 1 to 3 are employed in combination, it is possible to manufacture a deformed can having a higher degree of deformation and a more complex shape as shown in FIGS. 10 to 11.

The deformed can (18) shown in FIG.
l), (D2)) and drawing processing from the bottom (8) side (for example, the first and second drawing processing (D7), (D8) in Fig. 3).
)').

The deformed can (19) shown in Fig. 11 employs a combination of the drawing processes (D4), (D5), (06) shown in Fig. 2 and the drawing process (07L (08) shown in Fig. 3). It was manufactured by.

The materials for the bottomed cylindrical metal cans processed by the manufacturing method of the present invention include, in addition to aluminum, copper, brass, iron, alloys based on these metals, and surface treatments (plating, oxide film formation) on these metals. There are various types of metals that can be plastically worked, such as those that have undergone plastic processing.

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

[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 making it possible to provide a metal can with a high design quality.

[Brief explanation of the drawing]

FIG. 1 is a process explanatory diagram showing one embodiment of the manufacturing method of the present invention, FIGS. 2 and 3 are process explanatory diagrams showing other embodiments of drawing in the manufacturing method of the present invention, and FIGS. 5
The figures are partially cutaway side views showing embodiments of metal cans subjected to curling according to the present invention, and Nos. 6 to 1.
FIG. 1 is a partially cutaway side view showing an example of a deformed can manufactured by the method of the present invention. (Main symbols in the drawings) (A): Impact extrusion (8): Necking (C) Double curling (D) Double drawing (1): Can (2) Double opening (5): Shoulder ( 6): Body part (7): Neck part 1st drawing process Figure 2 Figure 3 Figure 4 Figure 2'5 Figure 26 Figure 27 Figure 8

Claims (1)

[Claims] 1. A necking process and a curling process are performed in that order near the opening of a metal can on a bottomed cylinder, and then a drawing process is performed on the body of the metal can from one end to the other end. A manufacturing method for deformed cans featuring: 2. The manufacturing method according to claim 1, wherein the drawing process is performed from the opening side of the metal can. 3. The manufacturing method according to claim 1, wherein the drawing process is performed from the bottom side of the metal can.