KR20040059954A - A forming appratus of a shaped can body - Google Patents

Abstract

PURPOSE: An apparatus for forming the body of shaped can is provided to reduce manufacturing time of the shaped can to improve productivity by simply expanding the body of the can without additional investment of expensive facility using an ordinary hydraulic system and expanding can mounted on an outer mold without extra transfer process. CONSTITUTION: The apparatus comprises a lower plate(2) on which two piece or three piece can is rested; an outer mold(3) in which a space is formed so that the two piece or three piece can rested on the lower plate is inserted into the space, on the inner surface of which an intagliated curved part(30) is formed, and inner diameter of which is larger than outer diameter of the can as much as 0.5 to 1 mm; a hydraulic supply part(4) for supplying hydraulic pressure into the can inserted into the outer mold by hydraulic system; and an axial press(6) for pressing the can expanded by the hydraulic supply part in an axial direction and having a pressing displacement control function at the same time.

Description

A forming appratus of a shaped can body}

The present invention relates to an apparatus for forming a body of a shape can, and more particularly, to an arbitrary shape using a molding apparatus on a body of a cylindrical ordinary two-piece or three-piece can made of a tin plated steel sheet or an aluminum alloy sheet. The present invention relates to a body shaping apparatus having a shape (Shaped can) to differentiate the design of the can to be manufactured by forming a bend of the can.

In general, the cans are manufactured to store liquid or solid processed foods using metal materials. The cans are three-piece and two-piece cans depending on the number of components. Are distinguished.

Here, the three-piece can described above is composed of three parts such as a lid, a body, a bottom, and the two-piece can is integrally formed with the body and the bottom.

In general, the three-piece can of the cans are manufactured using a tin plate, which is a kind of low carbon steel sheet, and in the case of a two-piece can, an aluminum alloy plate or a steel plate.

Cans made from these materials undergo cleaning, drying, and basic painting processes in line with their respective manufacturing processes, and then perform commercial printing on the exterior to complete the body of the final can.

On the other hand, the two- or three-piece can is currently manufactured is a simple form, the majority of the appearance has a cylindrical shape, regardless of the type of contents stored or the container manufacturing company.

However, in recent years, there has been an increasing interest in the development of shape cans in which a part of the can body is expanded to bend a molded part due to diversification of the can outer design and reinforcement of the can body strength.

Such shaped cans are usually manufactured by hydraulic molding, such as a hydroforming process. This hydroforming method places a can to be molded in an outer mold (container) in which a certain shape of curvature is engraved on the surface, and applies a fluid pressure to the inner surface of the can to expand the diameter of the can, thereby reducing the negative shape of the outer mold. It is a method of embossing the can body.

However, in the case of the usual two-piece or three-piece cans used for forming the shape cans, since the wall thickness of the cans is thin, there is a limit that the tube can be sufficiently expanded into any shape. In particular, the two-piece can produced by drawing and ironing molding, which is a type of litigation method, has a desired shape because the material of the can wall is hardened by continuous deformation and the wall thickness is very thin, about 70-100 microns. Frequently, the wall part of the can was broken during molding without being expanded.

In particular, in the case of steel two-piece can made of stone plate steel, the expansion ratio (diameter ratio after expansion to the diameter of the initial can) is only 1 to 2%.

Therefore, in order to increase the marginal expansion rate of the shape can as described above, European Patent No. EP0864385A3 (Body-necking a wall-ironed can), US Patent US5899106 (Process for manufacturing a shaped metal can) and the like. It is known.

The main concept of these patents is thin can walls by applying the full body necking method (EP0864385A3) or the accordion folding method (US5899106) to cans that have been completed with the usual two-piece can forming process. By increasing the thickness, it is intended to increase the ductility of the wall material.

However, according to the above method, a slight increase in the expansion rate can be expected due to the ductility increase effect due to the thickening of the can wall part, but the full body necking method or the accordion folding method can be expected. In order to apply, the device is complicated and expensive new equipment must be additionally installed, and the manufacturing time per unit can is increased due to the transfer between processes.

The present invention has been made in order to improve the problems according to the prior art as described above, the object is, after mounting the can to the outer mold having the intaglio bent in an arbitrary shape, it is mounted on the mold to supply hydraulic pressure from the outside By forming the body of the shape can corresponding to the intaglio portion of the outer mold, it is possible to form the body of the shape can with only a simple equipment without expensive equipment investment like the conventional device for increasing the expansion rate of the can. Of course, to provide a body forming apparatus of a shape can that can improve the productivity by shortening the manufacturing time of the shape can by expanding the can mounted without a separate transfer process when manufacturing the shape can.

1 is a cross-sectional view showing a conventional general two-piece can.

Figure 2 is a configuration diagram showing the overall configuration of the body forming apparatus of the shape cans according to the present invention.

Figure 3a, 3b is an operating state diagram showing the manufacturing process of the can according to the body forming apparatus of the shape can of the present invention.

Figure 4 is a perspective view showing the outer appearance of the can produced by the body forming apparatus of the shape can according to the present invention.

♣ Code description of main part of drawing ♣

1 ... can 2 ... bottom plate

3.External mold 4 ... Hydraulic supply

6 ... Axial pressurizer 9 ... Shape can

30.Bending part 60 ... Pressure surface

As a technical means for achieving the above object, the present invention is a body forming apparatus of the shape can, the lower plate, which is placed two- or three-piece can,

An outer mold having a space for inserting a two-piece or three-piece can placed on the lower plate and having an intaglio bent portion on an inner surface thereof;

A hydraulic pressure supply unit for supplying hydraulic pressure to the inside of the can inserted into the external mold by a hydraulic system;

It is to provide a body forming apparatus of the shape can, characterized in that it comprises an axial pressurizer which presses the can expanded by the hydraulic supply in the axial direction and at the same time has a pressure displacement control function.

The present invention is characterized in that the inner diameter of the outer mold is formed to be 0.5mm ~ 1mm larger than the outer diameter of the can so that the can is easily mounted and detached inside the outer mold during the continuous expansion operation of the can.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side view showing the outline of a two-piece can manufactured by a conventional method, Figure 2 is a structural diagram showing a schematic configuration of a body forming apparatus of a shape can according to the present invention.

As shown in the figure, the body forming apparatus of the shape can applied to the present invention is provided with a lower plate 2 on which a two-piece or three-piece can 1 is placed.

On both sides of the lower plate 2, an outer mold 3 having a space in which a two-piece or three-piece can 1 placed on the lower plate 2 can be inserted is installed, and the outer mold 3 ) Is an intaglio curved portion 30 is formed on the inner surface.

Here, as the material of the outer mold (3) is enough about the heat-treated carbon steel, it is preferable to use alloy tool steel in order to ensure abrasion resistance in long-term use, to facilitate the detachment of the can 1 It is preferred to fabricate two semi-divided cylindrical shapes.

In addition, it is preferable that the inner diameter of the outer mold 3 is made larger by about 0.5 mm to 1 mm than the inner diameter of the can 1 in order to facilitate the elongation and detachment of the can 1.

On the other hand, the hydraulic supply unit 4 for supplying the hydraulic pressure through the hydraulic system inside the can 1 inserted into the outer mold 3 to expand the can inserted into the outer mold is installed on the lower plate 2 do.

Subsequently, an axial pressurizer 6 having a pressure displacement control function is pressurized to the hydraulic supply unit 4 in an upward direction and pressurizes the can 1 to be extended in the axial direction. The pressurizer 6 has a configuration in which a dome-shaped pressurization surface 60 corresponding to the bottom of the can is formed at a bottom thereof.

Therefore, looking at the operation and effect according to the body forming apparatus of the shape can of the present invention having the configuration as described above are as follows.

Figure 3a, Figure 3b is an operating state diagram showing the operating state of the body forming apparatus of the present invention shaped can according to the expansion body of the two-piece or three-piece can, respectively, a conventional two-piece can as shown in FIG. An example will be described.

FIG. 2B shows the mold just before the two piece can 1 is mounted inside the outer mold 3 and the axial press 6 is slightly lowered to form.

As shown in the drawing, when the two-piece can 1 is placed on the lower plate 2, the outer mold 3 is transferred from both sides and the two-piece can 1 is placed on the lower plate 2 ( It wraps around the outer circumference of 1), and on the upper side thereof, the axial presser 6 is lowered to pressurize in the axial direction of the can 1.

3b shows a mold state in which the actual body shaping of the can is performed in a state in which the can 1 is mounted on the outer mold 3 as described above, and the can 1 is placed inside the divided outer mold 3. When mounted and in contact with the lower plate 2, the axial presser 6 is lowered to press the can 1 in the axial direction. The axial presser 6 has a dome-shaped press surface 60 formed on the bottom thereof. As a result, it is in close contact with the bottom surface of the can 1 mounted on the outer mold 3 to fix it, and at the same time, the hydraulic pressure is filled in the can 1 through the hydraulic supply unit 4 to promote expansion pipe deformation. Will be.

In particular, the axial load according to the lowering of the axial pressurizer 6 plays a role of greatly improving the expansion rate of the can 1 as a part for performing a key function in the present invention.

That is, when the axial load is applied to the can 1 by the axial pressurizer 6, the wall material of the can moves downwardly by the axial load and flows to the engraved bent portion 30 of the divided outer mold 3.

Such flow phenomenon of the material is to increase the material thickness of the bent portion to expand eventually serves to improve the tensile force, thereby improving the expansion rate of the can (1).

Such an axial pressurizer 6 can be constituted by a conventional hydraulic and control system, and can exhibit the functions as described above while retaining only the control functions of the axial and axial feed displacements.

Therefore, when the hydraulic pressure is continuously supplied through the hydraulic pressure supply unit 4 in the state where the tensile force of the bent portion in which the can is expanded as described above is increased, the can mounted on the external mold has an inner surface of the external mold 3. The body of the can 1 is expanded in a shape corresponding to the intaglio bent portion 30 formed therein, and the can 9 having an arbitrary shape body as shown in FIG. 4 is manufactured.

As a result, by changing the shape of the bent portion 30 formed intaglio on the inner surface of the outer mold (3) it is possible to manufacture cans 9 having various shapes and shapes.

Below, an example about the expansion rate experiment of the shape can shape | molded by the above-mentioned shaping | molding apparatus is demonstrated.

The cans used in this experiment are cans of nominal standard 211x413 with an outer diameter of 66.02mm and the capacity is 355ml.

Prior to embossing, the can body was manufactured by a conventional two-piece can manufacturing process.

The inner diameter of the outer mold was set to 66.01m, and the material of the outer mold is tool steel SKD 11.

The hydraulic pressure supplied through the hydraulic supply unit was configured to have a capacity of up to 1000 bar, but this experiment took about 200 bar.

A maximum of about 120 kg was applied during the axial pressurization, and the axial feed distance was about 4 mm in this experiment.

As a result of repeating the experiment several times through the experimental conditions as described above, the body of the shape can 9 as shown in FIG. 4 was molded, and the expansion rate of the can body reached about 9% so that the expansion rate of the body was remarkably increased. It became.

As described above, according to the present invention, the body shaping device of the shape can, the body of the can can be easily expanded by using a conventional hydraulic system without additional expensive equipment investment of the shaping device, and a separate transfer process when manufacturing the shape can Without this, it is possible to expand the can mounted on the external mold, thereby shortening the manufacturing time of the shape can, thereby improving productivity.

While the invention has been shown and described with respect to specific embodiments thereof, it will be appreciated that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the following claims. Those of ordinary skill will want to know easily.

Claims (1)

A lower plate (2) in which a two or three piece can (1) is placed, It has a space in which the two-piece or three-piece can 1 placed on the lower plate 2 can be inserted, and an intaglio bent portion 30 is formed on the inner surface thereof, and the inner diameter thereof is larger than the outer diameter of the can 1. Outer mold (3) formed 0.5mm ~ 1mm larger, A hydraulic pressure supply unit 4 for supplying hydraulic pressure to the inside of the can 1 inserted into the outer mold 3 by a hydraulic system; And an axial pressurizer (6) which presses the can (1) which is expanded by the hydraulic pressure supply unit (4) in the axial direction and has a pressurization displacement control function at the same time.