KR100474811B1 - Forging Apparatus for Metallic Pan - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for a metal container, and more particularly, to a molding apparatus for a metal container having a quadrangular shape made of stainless steel and having a bent edge extension on its upper outer circumference.

In the conventional case, a cylindrical metal container is mainly formed by plastic working by press molding. In the case of a quadrangular container, cracking occurs during press molding due to the characteristics of the molding structure when forming the corner portion. The defect rate of the product is high, the bending edge extension portion of the upper outer circumference has a problem that the productivity is reduced because the work is made in a separate molding process rather than the main molding process.

The present invention allows the molding of the bent edge extension of the upper outer circumference at the same time to remove the defects of the corner portion in the main press molding process to improve the productivity, in particular, the press of the metal container having a quadrangular shape of the metal container Effective in the field of molding technology, it can be utilized appropriately and economically.

Description

Forming apparatus for metal containers {Forging Apparatus for Metallic Pan}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for a metal container, and more particularly, to a molding apparatus for a metal container having a quadrangular shape made of stainless steel and having a bent edge extension on its upper outer circumference.

In the conventional case, the cylindrical metal container is mainly formed by plastic working by press molding. In this case, since the entire outer circumferential surface is molded into a constant curved surface, the design of the upper and lower press molds is greatly increased during the molding process. It is widely used because there is no difficulty, and in fact, a relatively low probability of defective products even in the molding process.

In addition, in the case of a quadrangular container, the shape of the outer periphery should be simultaneously formed at the curved portion of the corner and the remaining flat portions except the corners. In particular, since the expansion ratio of the edges is increased, the nonuniformity of these mutual expansion ratios causes cracks or other defects easily in the molding process, thereby causing a failure rate.

In addition, such a conventional molding method as a whole, as illustrated in Figure 1, the primary press molding step (1), the heat treatment step (2) of the material, the secondary press molding (3) made of the primary molding The container is molded through a trimming process (4) for removing the flash, a third forming process (5) and a finishing process (6) of the bent edge extension of the upper outer circumference, or as illustrated in FIG. The method of forming the container is carried out through the first press forming step (1), the trimming step (4) for removing the flash, the forming step (5) and the finishing step (6) of the upper edge of the bent edge. .

However, this conventional quadrangular container molding method has a problem that the work is cumbersome and productivity is lowered because the molding process (5) of the outer peripheral bending extension must be performed separately.

The present invention is intended to solve this conventional problem.

The main purpose of the present invention is to improve productivity while removing defects at edges in the main press molding process to reduce defect rate.

Another object of the present invention is to be able to be molded at the same time the edge portion of the upper outer periphery in the process of molding the container body to be made to work faster and to improve the productivity.

In order to achieve the above objects, the present invention provides a press molding process for forming an inner side of a main body of a metal container, a trimming process for removing a flash, and a forming process of a bent edge extension located at the upper outer periphery of the metal container. In shaping each type of container, a molding apparatus is provided as follows to simultaneously mold the bent edge extensions located on the inside of the container body and the upper outer periphery of the container in the press molding process.

That is, a fixed block is installed on a plurality of columns fixedly installed on the pedestal, and the ram is installed to be able to move up and down by a cylinder between the pedestal and the fixed block by a cylinder. The upper and lower metal molds are formed in an ordinary metal container forming apparatus, wherein the upper and lower molds are formed at a position corresponding to the lower mold to press-mold a material positioned on the lower mold. There is provided a molding apparatus for a metal container comprising a main body forming part for molding the inside of the main body and having a processing allowance larger than the molding thickness of the material in the gap between the corners of the main body forming part.

In addition, the upper and lower molds are formed of a metal container forming apparatus for forming a body forming portion for forming the inside of the body of the metal container and the edge forming portion for forming the bent edge extension located at the upper outer periphery of the metal container at the same time Is provided.

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

First, according to the molding apparatus of the present invention, as shown in Figs. 3 to 6, a fixing block 14 is installed on a plurality of columns 12 fixed to the pedestal 10, and the pedestal 10 and the Ram 18 is installed between the stationary block 14 to allow the cylinder 12 to move up and down by the column 16, the lower mold 30 is located on the pedestal 10, In the RAM 18, the upper mold 20 is installed in a position corresponding to the lower mold 30, the molding apparatus of a conventional metal container made of a pressure molding the material located on the lower mold 30, The upper and lower molds 20 and 30 have body forming parts 22 and 32 for forming the inside of the main body 8 of the metal container 7, and corner portions of the main body forming parts 22 and 32. (26,36) The clearance gap 40 is larger than the molding thickness of the raw material.

In addition, the above-described upper and lower molds 20 and 30 are located at the upper outer peripheries of the body forming parts 22 and 32 and the metal container 7 for forming the inside of the body 8 of the metal container 7. At the same time it can be made with each of the edge forming parts (24, 34) for forming the bending edge extension (9).

At this time, the main body forming parts 22 and 32 of the upper and lower molds 20 and 30 are formed in consideration of the thickness of the material after the molding process so as to match the shape of the metal container 7 to be molded. It is formed to have a gap between 30, the gap between the corners (26, 36) is formed to have a processing margin 40 larger than the molding thickness of the material.

As such, the reason for forming the process margin 40 is that the edge portion 8a constituting the main body 8 of the metal container 7 and the remaining portions except the edge portion 8a have an expansion ratio during the press molding process. This is because it is greatly changed so that it can be accommodated.

In addition, the edge shaping portions 24 and 34 of the upper and lower molds 20 and 30 serve as a site for forming the bent edge extension 9 located at the upper outer periphery of the metallic container 7. In consideration of the thickness of the raw material after the molding process to match the shape of the)) is formed to have a gap between the upper and lower molds (20,30).

Next, a process in which molding is performed using the above-described apparatus will be described.

First, when the metal material to be formed in the metal container 7 is mounted on the upper part of the lower mold 30 and the molding press is operated, the cylinder 16 is operated so that the ram 18 moves down the column 12 and the ram The upper mold 20, which was installed at 18, is coupled to the lower mold 30 while accommodating a metal material therein, and press forming is performed.

At this time, the main body 8 portion of the metal container 7 and the bent edge extension 9 located at the upper outer periphery are also formed at the same time, and particularly, the corner portion forming the main body 8 of the metal container 7. 8A and the remaining portions except for the corner portion 8a have the processing margin 40 in the corner portions 26 and 36, even though the expansion ratio is greatly changed during the press molding process. Press molding is performed smoothly without damage such as cracks.

Of course, when the depth constituting the main body 8 of the metal container 7 is relatively deep so that it cannot be completed through the primary molding process, the metal container in the form of a semi-finished product is formed during the primary press molding process, and the heat treatment process is performed. After the rough, the actual molding process as described above, including the body (8) and the bending edge extension (9).

In addition, although not shown separately in the above-described primary molding process, by applying the technical content to have the processing margin 40 in the corners 26 and 36 in the upper and lower molds 20 and 30 described above. Adoption and utilization are desirable.

As such, when the process of simultaneously molding the main body 8 portion of the metal container 7 and the bent edge extension portion 9 located at the upper outer circumference thereof is completed, the flash portion remaining outside the bent edge extension portion 9 remains. Performing the necessary finishing process separate from the usual trimming process of removal yields the desired finished metallic container.

As described above, according to the molding apparatus of the present invention, the upper outer peripheral edge in the process of forming the container body 8, while lowering the defective rate by removing the defective factors of the edge portion by the processing margin 40 in the press molding process It is also possible to be molded at the same time the edge extension portion 9 of the bending work is made quickly has an excellent effect, such as improved productivity can be made.

1 is a process chart for explaining an example of a conventional molding method,

2 is a process chart for explaining another example of the conventional molding method;

Figure 3 is a process chart for explaining a preferred example of the present invention molding concept,

Figure 4 is a perspective view showing the appearance of a metal container molded by the present inventors molding concept,

Figure 5 is a front view of the main portion showing a preferred example of the molding apparatus of the present invention,

Figure 6 is a longitudinal cross-sectional view showing a corner of the upper and lower molds of the molding apparatus shown in FIG.

FIG. 7 is a longitudinal sectional view of the forming apparatus shown in FIG. 5 centering on the remaining planar portions instead of the corner portions of the upper and lower molds. FIG.

<Explanation of symbols for the main parts of the drawings>

7: metal container, 8: body, 8a, 26, 36: corner portion, 10: pedestal,

12: column, 14: fixed block, 16: cylinder, 18: ram,

20,30: upper and lower mold, 22,32: main body molding part, 24,34: edge molding part

40: Processing margin

Claims (3)

delete A fixed block is installed on a plurality of columns fixedly installed on the pedestal, and a ram is installed to move up and down by a cylinder between the pedestal and the fixed block. The lower mold is located on the pedestal. In the ram forming apparatus of a conventional metal container formed in the position corresponding to the lower mold, the upper metal mold is formed so as to press-mold the material located on the lower mold, The upper and lower molds have a main body forming part for molding the inside of the main body of the metal container, and forming a metal container having a processing allowance larger than the molding thickness of the material in the gap between the corners of the main body forming part. Device. The method of claim 2, The upper and lower molds are formed of a metal container, each of which includes a body molding part for molding the inside of the body of the metal container and an edge molding part for molding the bent edge extension part located on the upper outer periphery of the metal container. Device.