KR101473230B1

KR101473230B1 - Deep drawing method for square storage

Info

Publication number: KR101473230B1
Application number: KR1020140044594A
Authority: KR
Inventors: 이효진
Original assignee: 주식회사 모리스
Priority date: 2014-04-15
Filing date: 2014-04-15
Publication date: 2014-12-17

Abstract

An object of the present invention is to provide a deep drawing method of a metallic quadrilateral container which is capable of shortening a drawing process of a hollow metallic quadrilateral container and efficiently drawing the container. The present invention relates to a deep drawing method of a quadrilateral container which includes a forward drawing step of forwardly drawing a metallic plate blanked in a size corresponding to a quadrilateral container design; a primary reverse drawing step of reversely drawing the forwardly-drawn substance obtained in the forward drawing step; a secondary reverse drawing step of reversely re-drawing the reversely-drawn substance obtained in the primary reverse drawing step; a post forward drawing step of tertiarily consecutively and forwardly drawing the reversely-drawn substance obtained in the secondary reverse drawing step; and a trimming step of trimming the edge of the final forwardly-drawn substance to form a quadrilateral container, or to a deep drawing method of a quadrilateral container which uses a composite mold for primary and secondary forward drawing in the post forward drawing step of the deep drawing method of a quadrilateral container.

Description

[0001] DEEP DRAWING METHOD FOR SQUARE STORAGE [0002]

The present invention relates to a rectangular container deep drawing method for improving productivity due to shortening of a drawing process and cost reduction by mold reduction when a drawing process is performed with a rectangular container having a high wall thickness.

Background Art [0002] As a prior art relating to a drawing forming method of a metal container, a drawing forming method is described in Patent Registration No. 58581, Publication No. 2001-67834, and JP14-331913.

However, this prior art molding method is a molding method that is limited to a cylindrical container or a tubular container, and a molding method in which the molding of a rectangular or rectangular container is not easy.

The metal cylinder used in these prior arts can be drawn uniformly under the same conditions since the circumferential wall has a circular tubular shape. However, the metal square box has four sides and angled portions (corners) where the adjacent sides meet at right angles.

That is, when drawing a rectangular barrel having a right angle corner (corner), all the surfaces are processed without interruption, but the angled portions are likely to be broken, unlike the surface portions. This is because the surface hardening of the angled part occurs when drawing. The surface hardening, which is particularly severe at such angular portions, increases as the drawing is repeated. Therefore, the narrower the width and the deeper the square, the more difficult it is to manage the quality of drawing.

Also, the higher the squareness of the container, ie the deeper the drawing process, the greater the number of molds and processes involved in the drawing process.

In order to obtain a rectangular container of the same size by the conventional straight drawing method, a nine-step regular drawing process was performed except for blanking and trimming. The increase of the mold is a burden on the initial investment cost, and it is also difficult to store the mold.

The increase in the drawing process is accompanied by an increase in the surface hardness of the intermediate drawing material, which makes it difficult to maintain the quality, such as cracking or roughness of the surface, and even breaking in the worst case.

In this respect, it is urgently necessary to examine a method of obtaining a high quality rectangular container by rapidly drawing a metal square container at a low cost even if its width is narrow, like a metal cylinder.

It is an object of the present invention to provide a metal square container deep drawing method capable of efficiently and cost-effectively drawing a metal square container having a high solidity at a low cost while shortening the drawing process.

According to an aspect of the present invention, there is provided a method of manufacturing a rectangular container, the method comprising: a normal drawing step of drawing a metal plate in a size corresponding to a design of a rectangular container in a forward direction; A first-order inverse drawing step of inversely drawing the fixed drawing obtained in the normal drawing step; A second-order inverse drawing step of performing inverse-drawing again the inverse drawing obtained in the first-order inverse drawing step; A final definite drawing step of successively drawing the second order reverse drawn product obtained in the second order inverse drawing step continuously over the third order; And a trimming step of trimming the edge of the final drawn product to form a rectangular container; In the order of the rectangular container deep drawing method.

Alternatively, a normal drawing step may be performed in which the metal plate is drawn in a size corresponding to the design of the rectangular container in the forward direction; A first-order inverse drawing step of first performing inverse drawing of the fixed drawing obtained in the normal drawing step; A second-order inverse drawing step of inverse-drawing the first-order inverse drawn product obtained in the first-order inverse-drawing step again; A complex regular drawing step of regularly drawing the secondary reverse drawn product obtained in the secondary inverse drawing step with a two-stage mold and a two-stage punch; A final definite drawing step of successively and regularly drawing the composite regular drawing obtained in the complex regular drawing step on two or more orders; A trimming step of trimming the edge of the final drawing material to form a rectangular container; In the order of a rectangular container deep drawing method.

Unlike the conventional rectangular container deep drawing method in which only nine drawing steps are required except for the blanking step and the trimming step, the first and second reverse drawing steps following the initial regular drawing step are introduced, It is possible to obtain a high-quality deep-drawn rectangular container by removing the defects caused in the subsequent drawing step by previously removing the structure of the drawing material.

In addition, it is possible to obtain a rectangular container conforming to the design value by only three consecutive regular drawing operations performed after the second-order inverse drawing step, so that it is possible to reduce a part of the mold to be mobilized during the latter-stage drawing step, The subsequent drawing process is shortened and the drawing processing efficiency is also improved.

In addition, the use of a complex mold and a corresponding two-stage punch reduce the reduction and shortening of the mold and drawing process required to obtain the final drawing.

1 is a flow chart of a conventional rectangular container deep drawing
2 is a flow chart of a rectangular container deep drawing according to an embodiment of the present invention.
3 is a flowchart of a rectangular container deep drawing according to another embodiment of the present invention
FIG. 4 illustrates the structure of a composite mold and a two-stage punch for use in the later-stage drawing step subsequent to the second-order inverse drawing step.
It is witty.
5 is an exemplary diagram of a one-stage drawing by a complex mold-double-stage punch
Fig. 6 is an exemplary diagram of a two-step drawing by a complex mold-two-stage punch

As shown in FIG. 1, the conventional rectangular container deep drawing includes a blanking step, a regular drawing step (first through ninth steps) for regularly drawing the work in a forward direction a plurality of times, a trimming step for the final drawing obtained in the final step The mold and punch are necessary for each drawing step. Therefore, the burden of the mold including the punch is too great, and the drawing process is proportional to a large number of molds, so that the deep drawing processing efficiency is relatively low, and there are mold and process defects.

In FIG. 2, in deep drawing and trimming of a rectangular container with a rectangular container conforming to a design value by drawing over aberration, the present invention is characterized in that the drawing proceeding between the blanking step and the trimming step, A definite drawing step; A first-order inverse drawing step of performing a first-order inverse drawing of the fixed drawing obtained in the normal drawing step; A second-order inverse drawing step of performing inverse-drawing of the first-order inverse drawn product obtained in the first-order inverse-drawing step; And a later-stage drawing step in which the second-order reverse drawing material obtained in the second-order inverse drawing step is continuously drawn over the aberration.

During the initial step, the drawing is stressed and the tissue relaxes. As a result, the surface of the drawing becomes cracked, or the thick and thin portions are mixed together. In the worst case, the drawing water is blown up.

To eliminate these machining failures, the initial hard drawing material that can be hardened must be loosened. The primary reverse drawing stage takes this into consideration.

Even if the organization is released by going through the first stationary drawing stage, it can be subjected to another stress in the process. It is also dangerous to inject this stress into the constant drawing step which proceeds continuously over the aberrations without being solved. Therefore, it is necessary to solve the accumulated potential stress accumulated in the first - stage reverse drawing stage.

The second-order inverse drawing step is a process for stabilizing the tissue by eliminating the stress generated in the first-order inverse drawing step and is absolutely necessary for improving the quality of the rectangular can by the deep drawing.

The secondary stationary drawing through the secondary stationary drawing stage is smooth and stable even after several stages of stationary and stationary drawing, as the organization is stabilized.

As described above, when the first and second inverse drawing steps are introduced between the initial positive drawing step and the late definite drawing step, the surface hardening phenomenon of the drawn material cured in the preceding drawing step is solved, so that the second-order inverse drawing step and the latter- So that a good deep drawing type rectangular container can be obtained.

In order to further reduce the deep drawing cost of the rectangular container and increase the drawing processing efficiency, as shown in FIG. 3, when the secondary reverse drawn material is put into the late definite drawing step, It is to carry out the basic drawing collectively.

4 shows the multiple metal mold 10 and the punch 20 thereof. The large diameter portion 11 is placed on the upper side of the large diameter portion 11 and the second large diameter drawing portion 11 is arranged below the large diameter portion 11. [ And a neck portion 12 is provided.

The punch 20 has a double punch 22 in which a small punch 22 corresponding to the small diameter portion 12 is inserted at the center of the axis of the large punch 21 corresponding to the large diameter portion 11 in the first fixed drawing stage of the later- The first cylinder 31 is a driving means for synchronizing the large punch 21 and the small punch 22 to perform the one-stage drawing during the first regular drawing of the last fixed drawing stage, and the second cylinder 32 Is a driving means for causing the small punch 22 to perform the two-stage drawing of the later-stage drawing stage after the one-stage drawing is performed in the first regular drawing of the later-stage drawing stage by the large punch 21.

5, the large and small punches 21 and 22 synchronize with each other by the first cylinder 31 to simultaneously press the secondary reverse drawn material a placed on the complex mold 10 to form the drawn product b 6, the second cylinder 32 further lowers only the small punch 22 to draw the drawn material b to be the drawn material c and to be carried out under the composite mold 10 . After the drawing c is taken out, the small and large punches 21 and 22 are raised by the second cylinder 32 and the first cylinder 31 to the standby position of the later-stage drawing stage, and then returned.

10: (for late-stage drawing)
11: Large neck
12: Small neck
20: (for late drafting) Punch
21: Large punch
22: Small punch

Claims

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A first primary drawing step of drawing the metal original plate in the forward direction, a first-order reverse drawing step of inverse drawing the fixed drawing obtained in the initial normal drawing step, a second-order reverse drawing step of inversely drawing the reverse drawing obtained in the first- A backward drawing step of successively drawing the secondary reverse drawn product obtained in the secondary reverse drawing step continuously over the aberration, a first normal drawing of the later definitive drawing step to the upper large diameter part and the lower small diameter part In a batch drawing using a combined mold comprising a mold and a two-step punch,
Wherein a square container is formed by the forward and backward drawing of a metal plate that has been plated in a size corresponding to the design of the rectangular container, and a square container with an angled edge is drawn in a later stage drawing step.