JPH0312979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial 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.

[Conventional technology]

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).

[Problem that the invention seeks to solve]

All of the above-mentioned processing methods require expensive and complicated equipment, and have the problem 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 that provides a high design effect.

[Means for solving problems]

The manufacturing method of the present invention includes (a) manufacturing a bottomed cylindrical metal monoblock can by impact molding, (b) drawing the body of the can from one end to the other, and (c) ) Further, a rolling process is performed in which a rolling element is inserted from the side where the drawing process has been performed, and the rolling element is rolled in the vertical direction of the metal can while pressing the rolling element against the surface of the body of the can. is a structural feature.

Note that rolling in the vertical direction refers to cases in which the rolling elements are moved relative to the can parallel to the can's central axis, cases in which the can is moved parallel to the rolling elements, and cases in which the can and the rolling elements are moved parallel to the can. This concept also includes the case where the can is relatively moved in the axial direction while being given relative rotation around the central axis between the can and the can.

[Effect]

Since a monoblock can formed by impact molding is used, there is no need to support the processing pressure applied to the outside of the can from the inside of the can. Furthermore, since the can is drawn from one end to the other, the rolling elements can be smoothly passed through the body from the drawn part without having to expand or contract in the radial direction. There are advantages.

〔Example〕

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

FIGS. 1 and 2 are a partially cutaway side view and a plan view showing one embodiment of rolling machining according to the present invention, respectively, and FIGS. 3 to 5 are other embodiments of rolling machining according to the present invention, respectively. Schematic plan view showing the sixth
7 and 7 are a partially cutaway side view of an example of a metal can subjected to curling according to the present invention, and FIG. Figures 9 to 12 are explanatory views of the main steps showing other embodiments of the manufacturing method of the present invention, and Figures 13 and 14 show the shape of the can before and after the drawing process shown in Figure 12, respectively. 15 to 21 are side views showing examples of deformed cans molded by the manufacturing method of the present invention, and FIGS. 22 and 23 are shown in FIGS. 20 and 21, respectively. Plan view of deformed can, 2nd
FIG. 4 is a sectional view taken along the line X-Y in FIG. 23.

In Figures 1 and 2, 1 is an aluminum can (so-called aluminum monoblock can) formed by impact extrusion processing (impact molding), and the vicinity of the opening 2 is necked by drawing using a conventionally known method. and curling are applied in that order.

In the rolling machining shown in Figs. 1 and 2, a rolling tool 3 with the inner ring removed from a deep groove radial ball bearing is fitted onto the outer periphery of the can 1 from the shoulder on the opening 2 side of the can 1 until it reaches the vicinity of the bottom 4. This is done by pushing down in the direction of arrow P and then pulling up the rolling tool 3 in the opposite direction. The diameter d1 of the inscribed circle of the ball 5 constituting the rolling element of the rolling tool 3 is the outer diameter d2 of the can 1.
The can 1 is made somewhat smaller, so that the can 1 is formed with a large number of longitudinal ribs 6.

In that case, since the curling part 7 has high strength,
The outer diameter d3 of the rolling tool 3 is made smaller than the diameter d1 of the rolling tool 3 so that the rolling tool 3 does not get caught. Also, since the strength is high near the bottom 4, it is preferable to avoid rolling machining.If rolling machining is performed from the bottom side,
Alternatively, if the rolling elements are to be passed through the can in the axial direction, the bottom is drawn in advance into a tapered shape, as will be described later.

The rolling tools used in the method of the present invention include:
In addition to tools that use ball bearings as shown in FIGS. 1 and 2, various tools that use balls as rolling elements, such as tools that rotatably hold several steel balls, can be used. Furthermore, for example, the third
As shown in FIG. 5, rollers 8 may be employed as rolling elements, and both ends of several rollers 8 may be held rotatably.

In the case shown in FIG. 3, four rollers 8 are pressed against the outer periphery of the cylindrical can 1 from all sides, and the can 1 is pushed down from the opening side to the bottom side in the same way as in the case shown in FIG. After reaching the lower end, the rollers 8 may be pulled up as they are, or the rollers 8 may be separated radially outward from the can 1 to take out the molded deformed can.

Although the number and arrangement of the rollers 8 are not particularly limited, it is preferable to arrange two to eight rollers 8 at equal intervals so that the pressing force applied to the periphery of the can 1 is approximately balanced.

FIG. 4 shows a method of processing a cylindrical can 1 into an elliptical shape by arranging two rollers 8 facing each other. As a result, a deformed can 9 having an elliptical cross-sectional shape as shown in FIGS. 21, 23 and 24 is obtained. The shape of the roller 8 is not particularly limited, and depending on the deformable can to be formed, for example, a roller 10 with a thick center portion as shown in FIG. 5 may be adopted.

It is preferable to perform a reinforcing process on the opening, such as netting or curling, prior to the rolling process in the method of the present invention, since this facilitates the rolling process and the drawing process described below. Either one of the netting process or the curling process may be applied to the opening 2, or the netting process and the curling process may be performed in that order. When only curling is performed without necking by drawing, the rolling process can be performed from the bottom side of the can that has been previously drawn. Furthermore, if the can is curled inwardly, the rolling process can be easily performed from the upper side of the can even if there are few steps in the drawing process.

In the case of an aerosol can, the curling process is usually performed so that the edge 2a of the opening 2 faces outward, as shown in FIG. However, it may also be wound inward. Further, in the case of a metal can for food such as a youth can, a flange portion 12 having a U-shaped cross section that opens outward may be formed as shown in FIG. Note that the curling process in this specification includes not only the process of forming a curling part having a circular cross section as shown in FIG. 6, but also the process of forming a flange part 12 as shown in FIG.
The concept also includes processing that deforms the curling portion or the lunge portion into a flattened shape after these processing steps.

FIG. 8 schematically shows an embodiment of the manufacturing method of the present invention step by step. In this embodiment, first, an aluminum monoblock can (hereinafter referred to as can) 1 is formed from an aluminum plate by impact extrusion process A. Then can 1
A pilot 13 is inserted into the inside of the opening 2, and a mold 14 is inserted into the outside, respectively, and a necking process B is performed by drawing. In addition, netsking processing B
This is usually done with several punches depending on the desired diameter of the neck 15. Further, the neck portion 15 is subjected to a curling process C using a conventionally known method. Finally, for example, the first
~ Rolling processing E as shown in Figure 2 is performed. In addition, if an appropriate lubricating oil is applied to the surface of the can 1 in each of the above steps, the lubricating oil is washed away after the rolling process E.

Figure 9 shows that the first drawing process D1, the second drawing process D2, and the third drawing process D3 are inserted between the curling process C and the rolling process E in FIG. 8 to further enhance the design of the deformed can. An example of the enhanced manufacturing method of the present invention is shown. By this manufacturing method, a deformed can 17 is obtained in which the hem 16 is gently expanded and the vertical ribs 6 are formed on the upper part of the body.

FIG. 10 shows another embodiment of the manufacturing method of the present invention in which the first to third drawing steps D1, D2, and D3 in the manufacturing method shown in FIG. 9 are changed. That is, the first
The drawing depths in ~3 drawing processes D4, D5, and D6 become shallower in order. As a result, a bamboo shoot-shaped squeeze-deformed can 18 is obtained. Furthermore, the first rolling machining E
A deformed can 19 is obtained by performing the first and second rolling processes E2.

In the case of the above embodiments (FIGS. 1 to 10), the rolling tool 3 inserted from the opening 2 side is attached to the bottom 4.
It was stopped on the way to , and was pulled up from that position. However, the manufacturing method of the present invention is not limited to such cases.

In the embodiment of the manufacturing method of the present invention shown in FIG. 11, after the curling process, a first drawing process D1 is performed in which the vicinity of the bottom part 4 is narrowed into a tapered shape and the bottom part 4a is curved, and then that part is shaped into a cylindrical shape. A second drawing process D2 is performed to make the shape thinner. Furthermore, the diameter of the center portion 20 becomes larger than the diameter of the curling portion 7 and the bottom portion 4 by the third drawing process D3 that narrows the opening 2 side. Therefore, the rolling tool 3 fitted from the opening 2 side during rolling machining E can be pulled out to the bottom 4 side as is. Of course, the rolling tool 3 may be inserted from the bottom 4 side.

Also, insert the rolling tool 3 from the bottom 4 side, and
When pulling out to the side, if the diameter of the curling portion 7 is larger than the diameter of the body, rolling processing can be performed even if no necking processing is performed, for example.

FIG. 12 shows a process in which the can 1, on which the vertical ribs 6 have been provided by the rolling process E, is further subjected to a drawing process D. The drawing process D may be performed on the entire region on which the vertical ribs 6 are formed, or may be performed on a part of the region 21 on which the vertical ribs 6 are formed, as shown in FIG. Thereby, a deformed can with even higher design can be formed. Note that when drawing the deformed can 23 having vertical ribs 6 having a semicircular cross section as shown in FIG. 13, the width of the vertical ribs 6 becomes narrower and the depth becomes smaller as shown in FIG. As it becomes deeper, it takes on an angular cross-sectional shape, giving it a sharp appearance.

FIG. 15 shows a deformed can in which the vertical ribs 6 are formed as is after the tapered portion 23 is formed by the first drawing process D1 in FIG. 11. In that case, the rolling tool can also be passed from one end of the can to the other. In the case shown in FIG. 11 or FIG. 15, the rolling tool may be fixed and the can 1 inserted into the rolling tool.

FIG. 16 shows a deformed can formed by rotating the can 1 itself around its axis in accordance with the movement of inserting a rolling tool into the can 1. In that case, it is relatively difficult to pull the rolling tool out of the can, so it is preferable to pass the rolling tool around the can as in the case of FIG. 15.

Figures 17 to 19 show a deformed can 24 obtained by rolling after drawing.
25 and 26, and it can be seen that deformed cans with various appearances can be obtained by changing the parts of the drawing process.

FIG. 20 shows a deformed can 27 formed by substantially the same method as the rolling process shown in FIG. This product is formed into a prismatic shape with an octagonal cross section, as clearly shown in FIG. 22, by eight rollers employed as rolling elements. Note that the bottom portion 4 remains circular.

FIG. 21 shows a deformed can 9 formed by the rolling process shown in FIG. After this product is pressed by cylindrical rollers arranged to face each other, a so-called spring back occurs due to the elasticity of the metal can, so as shown in FIG. It has an almost elliptical cross section. Therefore, the shape differs depending on the viewing direction, as shown in FIGS. 21 and 24.

The material of the bottomed cylindrical metal can processed by the manufacturing method of the present invention includes, in addition to aluminum, copper, brass, iron, alloys mainly based on these, and various surface treatments ( Various metals that can be plastically worked can be used, such as those that have been subjected to plating, oxide film formation, etc.).

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

〔Effect 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]

FIGS. 1 and 2 are a partially cutaway side view and a plan view showing one embodiment of rolling machining according to the present invention, respectively, and FIGS. 3 to 5 are other embodiments of rolling machining according to the present invention, respectively. Schematic plan view showing the sixth
7 and 7 are side views of a partially cutaway part of a metal can subjected to curling according to the present invention, FIG. 8 is a process explanatory diagram showing an example of the manufacturing method of the present invention, and FIGS. 9 to 12 13 and 14 are main parts showing the shape of the can before and after the drawing process shown in FIG. 12, respectively. 15-21 are side views showing examples of deformed cans molded by the manufacturing method of the present invention, and FIGS. 22 and 23 are FIGS. 20 and 21, respectively.
A plan view of the deformed can shown in the figure, FIG.
It is a sectional view taken along the line XX in the figure. (Main symbols in the drawing) B: Netting processing,
C: curling, D: drawing, E: rolling, 1: can, 2: opening, 3: rolling tool, 4: bottom, 5: ball, 8, 10: roller.

Claims (1)

[Scope of Claims] 1 (a) A bottomed cylindrical metal monoblock can is formed by impact molding, (b) the body of the can is drawn from one end to the other, ( c) Furthermore, a rolling process is performed in which a rolling element is inserted from the side where the drawing process was performed, and the rolling element is rolled in the vertical direction of the can while pressing the rolling element against the surface of the body of the can. A manufacturing method for deformed cans featuring: 2. The manufacturing method according to claim 1, wherein after the rolling process, the body of the can is further subjected to drawing process from one end to the other end.