JPS62271832A - Square can and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a square can having a circular neck and a method for manufacturing the same.

BACKGROUND OF THE INVENTION Square cans are known as cans having a substantially rectangular cross section, that is, a rectangular or square shape with arcuate corners.

Square cans are superior to round cans in that storage space can be used more effectively. That is, when cans are closely arranged, a round can has a relatively large dead space between its side walls, whereas a square can has a relatively small dead space.

In addition, since the sides of square cans are flat, various characters and patterns can be displayed clearly. For example, by arranging multiple square cans in a store, an excellent display effect can be achieved. Square cans are better than round cans.

However, at present, round cans are not used as much as square cans, and this is thought to be due to the low productivity of square cans. That is, making the cross section of the can substantially rectangular can be done relatively easily and quickly, but forming a substantially rectangular flange portion for attaching a substantially rectangular lid to the substantially rectangular open end of the can; The adhesion of compound (sealant) to the flange and the tightening of the flange and lid are much slower than those for round cans, which reduces the productivity of square cans. .

Means for Solving the Problems According to the present invention, the above-mentioned problems are solved by providing a seamless body portion having a substantially rectangular cross section, and an open end having a circular cross section smaller than the cross section of the body portion. The present invention is solved by providing a square can characterized by having a neck portion having a neck portion.

Further, according to the present invention, the above-mentioned problems can be solved by a cup forming step of forming a cup having a substantially rectangular cross section from a thin metal plate, and by reducing the cross section of the open end portion of the cup, and by reducing the cross section of the main body. The present invention is solved by providing a method for manufacturing a square can, which includes a neck forming step of forming a neck portion having an open end having a circular cross section smaller than the cross section.

Embodiment Next, a square can and a method for manufacturing the same according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 7.

(Cup Forming Step) According to this embodiment, the thin metal plate 10 shown in FIG.
That is, from the blank a cup 12 having the generally rectangular cross section shown in FIG. 3 is formed.

This process is performed by a single drawing process to form a thin gold H4 plate.
This can be done by forming the cup 12 from scratch. Further, for example, by first proofing, a cup body 14 having a circular cross section as shown in FIG. 2 is formed, and by reproofing, a cup 12 shown in FIG. 3 is formed.
The cup 12 is formed from the thin metal plate 10 by multiple drawing processes.
can also be formed.

Furthermore, the cup 12 can also be formed from a 1° thin metal plate using a drawing and ironing method.

Additionally, if desired, the open end of the cup 12 can be trimmed to make the height of the circumferential wall of the cup 12 uniform.

It is also possible to form a cup having a circular cross section of a smaller diameter from the cup body 14 shown in FIG. 2, and then to form the cup 12 shown in FIG. 3 by bulge deformation. However, when the material is subjected to bulge deformation, there are problems such as partial work hardening, making it more likely to break, and wrinkles being more likely to occur between the bottom and the side wall. Therefore, as described above, drawing or ironing is preferable.

(Neck portion forming process) The open end portion of the cup 12 formed as shown in FIG. 3 is neck-ined once or several times so that the open end becomes circular. form 16.

In this embodiment, the cup 12 formed as shown in FIG.
A shaped body 18 as shown in the figure, that is, a body portion 20 having a substantially rectangular cross section, and a first portion 22 having a cross section smaller than the cross section of this body portion 20 and closer to a circular shape. I am forced to do it.

Furthermore, the shaped body 18 shown in FIG. 4 is subjected to a second neck-in process to form a square can 24 as shown in FIG.
A main body portion 20 having a substantially rectangular cross section, a first portion 22 having a substantially circular cross section, and a second portion formed on the top of the first portion 22 having a smaller cross section and a circular cross section. The square can 24 has a portion 26.

If desired, the second portion 26 can be formed into a square can 30 with an upper portion formed into seven flange portions 28, as shown in FIG.

(Preferred Embodiment) When the neck forming step includes neck-in processing multiple times, the circumference ratio (circumference before neck-in / circumference after neck-in) is 1.010 in each neck-in process. ~1.
095 is preferred.

This is because if the circumference ratio is less than 1.010, there will be little plastic deformation and the desired shape will not be obtained, and if it is more than 1.095, the axial forming load will be large and the can will not sit. By giving in.

(Preferred Embodiment 2) In the neck-in processing in the neck forming step, it is preferable to displace the material inward at any position on the periphery by more than the thickness of the plate.

This will be explained with reference to FIG. 7, which is a plan view of the square can 24 in FIG. 5.

This square can 24 includes a first portion 22 formed by a first neck-in process and a second portion 26 formed by a second neck-in process. first part 2
2 has a rectangular cross-section with rounded corners, and the second part 26 has a circular cross-section.

In order to form this second portion 26, in the neck-in processing, the flat surface 32 of the peripheral wall is not deformed inward, but the rounded portion 0 is sequentially deformed inward so that it has a circular cross section. It is also possible to process it. However, when processed in this way, there is a risk that distortion will occur due to stress and wrinkles will occur at the boundary between the rounded part and the flat part.

According to a preferred embodiment of the present invention, in each neck-in process, any position of the peripheral wall is displaced inwardly, and particularly preferably, it is displaced inwardly by more than the thickness of the peripheral wall.

In this way, stress is applied uniformly and wrinkles can be prevented.

(Preferred Embodiment 3) According to a preferred embodiment of the present invention, when the gold am thin plate 10 is made of bumpy, tin-free steel, or aluminum, the rolling direction of the gold am thin plate 10 is aligned with the flat surface 32 of the peripheral wall. Processed to be vertical. That is, for example, the thin metal plate is processed so that the rolling direction is in the left-right direction in FIG.

The reason is as follows.

When the thin metal plate 10 shown in FIG. 1 is drawn into the cup body 14 shown in FIG. 2, the part of the peripheral wall in the rolling direction and the part perpendicular to this become thicker, and the part between these parts becomes thicker. tends to become thinner.

On the other hand, when the cup body 14 shown in FIG. 2 is drawn into the cup 12 shown in FIG. 3, the rounded corner portions of the side wall tend to be thicker and the flat portions tend to be thinner.

Therefore, by processing the thin metal plate 10 so that the rolling direction is perpendicular to the flat surface 32 of the peripheral wall where it is formed,
The thickness of the peripheral wall before neck-in processing can be made uniform, and appropriate neck-in processing can be performed.

(Square Can) According to a preferred embodiment of the present invention, a square can is formed as described above.

This square can can be processed by, for example, drawing processing or ladder drawing processing.
Formed by neck-in processing. The body portion 20 thus has a generally rectangular cross-section, i.e. a rectangle or square with rounded corners, and the open end of the seamless neck portion 16 has a circular cross-section and a circular flange. A section 28 is formed. Thus, the open end of the neck portion 16 has a circular f! Since the main body part 20 is formed to have a l1li plane, it is possible to process the main body part 20 more preferably if it is a substantially square shape, that is, a square shape with rounded corners, than if its cross section is a substantially rectangular shape.

A lid is placed on the square can formed as described above, and the flange portion 28 and the lid are connected by seaming, for example, to form a beverage container.

Effects The corner table according to the present invention has a main body portion with a substantially rectangular cross section. Therefore, when densely arranged, the storage space is smaller than that of round cans, and the storage space can be used effectively. Also, excellent display effects can be achieved.

The horn according to the invention comprises a neck portion with an open end having a circular cross-section that is smaller than the cross-section of the main body portion. A flange portion can be arranged at this open end. Therefore, even if a container is formed by wrapping the lid around the flange portion and storing the lid, the containers can be closely arranged, and the storage space can be used effectively. If such a neck portion were not provided and the flange portion was installed directly on the main body portion, the outwardly expanding flange portions would come into contact with each other, making it impossible to arrange the containers closely.

The angler according to the invention has a seamless body. l
! If the main body has a seam, for example, it is necessary to attach a lid and a bottom to the top and bottom, respectively. For this,
For example, the upper and lower parts must be necked in to reduce the cross section, which reduces the internal storage volume and makes it impossible to use the storage space effectively. On the other hand, the corner table according to the present invention does not require the attachment of a bottom, and the storage space can be used effectively.

According to the present invention, square can containers can be rapidly manufactured. When manufacturing a container using a corner plate, a rectangular flange portion is generally provided at the open end of the corner plate, and the flange portion and a rectangular lid are connected, for example, by seaming. Unlike a circular flange, a rectangular flange takes a long time to manufacture.

Furthermore, to tighten the rectangular flange portion and the lid.

In comparison, when tightening a circular flange and a lid, not only does it take a long time, but it is difficult to tighten evenly, which tends to cause poor sealing.In contrast, the present invention's Kakuda Since it has a circular flange, the flange can be easily formed and the flange and the lid can be quickly and securely tightened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a metal sheet for manufacturing a kakuda according to a preferred embodiment of the present invention. 2 is a perspective view of a cup body formed by first drawing the thin metal plate of FIG. 1; FIG. FIG. 3 is a perspective view of a cup formed by redrawing the cup body of FIG. 2; FIG. 4 is a perspective view of a shaped body formed by performing a first neck-in process on the cup of FIG. 3; FIG. 5 is a perspective view of a square can formed by performing a second neck-in process on the shaped body of FIG. 4. FIG. 6 is a perspective view of a corner plate formed by flanging the corner plate of FIG. 5; FIG. 7 is a plan view of the Kakuda shown in FIG. 10...Thin metal plate 12...Cup 16...Neck part 20...Body part 24.30...Kakuta 28...Flange part (2 others) Figure 4 Figure 6 Figure 2 %5 Figure 7

Claims (1)

[Claims] 1. A seamless body having a generally rectangular cross section, and a neck having an open end having a circular cross section smaller than the cross section of the body. The characteristic square can. 2. The square can according to claim 1, wherein the main body has a substantially square cross section. 3. The square can according to claim 1 or 2, wherein the neck portion includes a flange portion. 4. The neck portion includes a first portion having a substantially rectangular cross section that is closer to a circle than the main body portion, and a second portion disposed on the first portion and having a circular cross section. The square can according to any one of claims 1 to 3. 5. A cup forming step of forming a cup having a substantially rectangular cross section from a thin metal plate, and reducing the cross section of the open end portion of the cup to create an opening having a circular cross section smaller than the cross section of the main body. A method for manufacturing a square can, comprising a neck forming step of forming a neck portion having an end. 6. The method for manufacturing a square can according to claim 5, wherein the cup forming step includes drawing. 7. The neck forming step includes a plurality of necking processes, and in each necking process, the circumference reduction ratio is 1.0.
10 to 1.095. The method for manufacturing a square can according to claim 5 or 6. 8. The neck forming step includes a plurality of necking processes, and in each of the necking processes, any position of the peripheral wall is displaced inward by a thickness greater than the thickness of the peripheral wall. The method for manufacturing a square can according to any one of the items. 9. According to any one of claims 5 to 8, the cup is formed such that the rolling direction of the thin metal plate is perpendicular to one of the flat surfaces of the peripheral wall of the square can. Method of manufacturing square cans.