Cup

Abstract

To provide a cup which can trace metal mold for cupping press corresponding to individuals in post-processes without damaging external appearance at low cost and with simple configuration, and a metal mold for cupping press for manufacturing the cup.SOLUTION: A cup, which is a precursor for manufacturing a can body for two-piece can C, has a bottomed cylindrical shape with a bottom and a shank, and has one or more embossment P on the bottom.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a precursor for manufacturing a can body for a two-piece can. Cup It relates to.

Background Art

[0002] Conventionally, as a can used for, for example, a beverage can, a metal two-piece can configured by winding and tightening a lid on an opening of a can body formed in a bottomed cylindrical shape is known. And in the process of manufacturing this two-piece can, a short-bottomed cylindrical cup that is a precursor of the can body is manufactured by punching and drawing a metal plate material. As an apparatus for manufacturing this precursor cup, a capping press is generally used (see Patent Document 1).

[0003] A capping press generally has a plurality of sets (usually 6 sets or more) of dies for punching and drawing a cup in one stroke, and punching and drawing are performed in each die in one stroke of the capping press, whereby a plurality of cups are manufactured.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Defects caused by the mold may occur in the cups manufactured using such a capping press. For example, metal powder scattered in a specific mold during cup forming builds up, causing scratches on the outer surface. If left untreated, it can lead to factors such as corrosion after filling, known as ERV defects, or factors causing barrel breakage. When defects occur, it is necessary to identify the mold that produced the corresponding cup and perform repair work. However, it is not easy to identify which mold the defect is caused by, and sequential inspections of each mold are required, which takes time. As a result, productivity decreases. Also, the production of two-piece cans is carried out at high speed. Specifically, the capping press operates at more than 120 strokes per minute, and a large number of cups are manufactured in a short time. Therefore, when a defective product is discovered, a large number of two-piece cans as final products may already have been manufactured with a mixture of good and defective products, making subsequent sorting difficult. As a result, even good two-piece cans have to be discarded in large quantities, which is a problem.

[0006] To address the above problems, it is conceivable to engrave numbers corresponding to each mold on the bottom surface of the cup. However, as the shape of the mold becomes more complex, the production of the mold becomes more complicated and the cost increases. In addition, there is a risk of promoting the generation and accumulation of metal powder during cup production. Furthermore, the engraving of numbers is completely unnecessary for consumers and damages the aesthetics. Also, a method of marking invisibly with a laser or the like is conceivable, but there is still a problem that the production cost of the device increases, such as newly equipping with a laser device.

[0007] The present invention solves the above problems and enables tracking of the capping press mold corresponding to each individual in the subsequent process with a low-cost and simple configuration without damaging the appearance. Cup The object is to provide such a thing.

Means for Solving the Problems

[0008] The cup according to the present invention is by a body manufacturer in the subsequent process a precursor for manufacturing a can body for a two-piece canmanufactured using a cupping press A cup, wherein the cup is a bottomed cylindrical shape having a bottom and a body, the bottom has an emboss, a plurality of and the emboss is located in a region within 75% radially outward from the axial center of the cup, the emboss has a diameter of 0.3 to 0.5 mm and a height from the bottom of 1.0 mm or less.

Advantages of the Invention

[0009] According to the cup according to claim 1, since the bottom of the cup, which is a precursor of the can body, has one or more embosses, by forming embosses in different states for each of a plurality of capping press dies on the bottom of the cup, even when defective products occur due to the capping press die, it is possible to track and identify the capping press die that has problems early in the manufactured cups, individual can bodies, and two-piece cans in the subsequent process.

[0010] Also, in the present invention According to the cup, since the emboss is located in a region 10 to 75% radially outward from the axial center of the cup, the emboss can remain without being crushed even when forming a ring-shaped grounding portion or the like in a subsequent process by a body manufacturer or the like. Therefore, it is possible to surely track and identify the capping press die that has problems early in any of the subsequent processes.

[0011] Also, in the present invention According to the cup, since the emboss has a diameter of 0.3 to 10.0 mm and a height from the bottom of 1.0 mm or less, while obtaining the effect of being able to track and identify the capping press die that has problems early as described above, it is possible to suppress the emboss from being conspicuous and damaging the appearance in the finally obtained two-piece can. In addition, since deformation of the bottom when forming the emboss can be suppressed to a small extent, generation of metal powder in the manufacturing process can be suppressed to a minimum.

[0012] Also, in the present invention According to the cup, by having a plurality of embossments, for example, it is possible to easily realize forming embossments in different states for each of a plurality of cupping press dies at the bottom of the cup, and it is possible to easily obtain the effect of being able to track and identify the cupping press die having the above-mentioned early troubles.

[0013] Also, in the present invention According to the cup, since a plurality of embossments are positioned concentrically with respect to the axial center of the cup, while surely obtaining the effect of being able to track and identify the cupping press die having the above-mentioned early troubles, all the embossments can be arranged at inconspicuous positions in the finally obtained two-piece can, and it is possible to suppress spoiling the appearance.

[0014] the present invention According to the cupping press die related thereto, since the bottom forming surface facing the surface that becomes the bottom of the cup in the cupping press die has a convex portion for forming an embossment at the bottom of the cup, by forming embossments in different states for each of a plurality of cupping press dies at the bottom of the cup, even when defective products caused by the cupping press die occur, it is possible to track and identify the cupping press die having early troubles from the manufactured cups, individual can bodies, and two-piece cans in the subsequent process at low cost and with a simple configuration. Further, by providing the cupping press die itself with a convex portion for forming an embossment at the bottom of the cup, an embossment can be formed simultaneously with the drawing process for forming the cup, so that it is possible to prevent a positional deviation from a desired position at the bottom of the cup. In addition, the process of separately forming an embossment can be omitted, and energy saving can be achieved. Furthermore, by making the embossment a protrusion with a simple structure, a fine structure such as digital engraving is not required, so that the complexity during the production of the die can be reduced.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0016] 〔Cup〕 The cup according to an embodiment of the present invention is a metal one that serves as a precursor for manufacturing a can body for a two-piece can, and is a bottomed cylindrical cup having a bottom portion and a body portion. The bottom of the cup has one or more embossments. The embossments have different states for each corresponding die for a capping press. Having embossments in different states for each die for a capping press means that they can be distinguished from each other by the number, shape, formation position, or a combination thereof. For example, the number of embossments may be different among the cups corresponding to each of the dies for a capping press arranged in parallel. And the corresponding die for a capping press can be specified by the number, shape, and formation position of the embossments. The number of embossments is, for example, two (two embossments P circled in FIG. 1) in the two-piece can of FIG. 1. In the present invention, an embossment is a protruding projection from the inside to the outside of the cup (the front side of the paper surface in FIG. 1). The embossment is formed so as to be visible when viewed from the bottom surface of the can body or the two-piece can.

[0017] The forming position of the emboss is determined in consideration of the shape of the bottom of the two-piece can C that becomes the product, and it is desirable that the position is such that there is no problem of being crushed during the forming of the bottom of the can and that the appearance is not impaired. Specifically, it is a position where the emboss remains without being crushed even during the forming of a ring-shaped grounding portion R or the like by a body manufacturer in a subsequent process, for example, immediately inside the ring-shaped grounding portion R. In FIG. 1, C is the two-piece can finally obtained, and R is a ring-shaped grounding portion with a substantially U-shaped cross-section that bulges convexly toward the bottom of the can so that a stable upright form is maintained when the two-piece can C is grounded on a horizontal plane. Specifically, when the radius from the axial center (center of the bottom of the cup) of the body of the cup to the outer edge is taken as 100%, the emboss is located in a region 10 to 75% radially outward from the center, and more preferably, in a region 35 to 75%. Specifically, when making a cup for manufacturing a two-piece can with a can body diameter of 66 mm, it is set so that the distance of the emboss from the axial center of the cup is 22.5 to 23.0 mm. If the forming position of the emboss is too close to the center of the bottom or too close to the outer edge of the bottom, there is a risk that the emboss will be crushed and unrecognizable when DI processing or bottom forming processing is performed on the cup, or that the appearance will be impaired. When the cup has a plurality of embosses, it is desirable that all the embosses are located within the above range, and it is also desirable that each is located concentrically with respect to the axial center of the cup in the above region.

[0018] The emboss in the cup is shaped and sized such that the emboss P remains visible even if the tool is pressed against the emboss at the bottom of the cup and deformed during these processing steps when DI processing and bottom forming processing are performed by a body manufacturer in a subsequent process. For example, it is a protrusion with a diameter of 0.3 to 10.0 mm and a height from the bottom (height from the outer bottom surface) of 1.0 mm or less. If the diameter of the emboss is too large and / or the height from the bottom is too large, it may impair the appearance of the resulting two-piece can when viewed from the bottom surface. On the other hand, if the diameter of the emboss is too small or the height from the bottom is too small, there is a risk that the emboss will be completely crushed and become invisible when DI processing or can bottom forming processing is performed on the cup.

[0019] As the plate material for forming the cup, for example, an aluminum alloy plate material with a thickness of 0.20 mm to 0.35 mm laminated with a PET film of about 0.01 mm on both sides is used.

[0020] 〔Capping Press Die〕 The capping press die of the present invention is for manufacturing a cup that is a precursor for manufacturing a can body for a two-piece can from a long plate material, and punches and draws the metal plate material. In the capping press die of the present invention, the process of punching a metal plate material into a substantially circular blank B, drawing it, and forming it into a cup shape while forming an emboss at the bottom can be performed in one stroke. The capping press die 100 according to an embodiment of the present invention includes a substantially cylindrical blank punch 120 having a cut end mechanism (not shown) at the outer edge of the lower end, a convex portion 130 for forming an emboss P at the bottom of the cup, and a substantially cylindrical punch nose (die) 150 that is slidably fitted into the through hole 120H of the blank punch 120 and inserted coaxially with the blank punch 120, and a cylindrical draw pad 190 that is disposed opposite to the lower side of the blank punch 120 and into which the punch nose 150 can be inserted. The cut end mechanism of the blank punch 120 can adopt a conventionally known configuration as long as it can punch the blank B. The punch nose 150 has an outer contour shape capable of drawing the blank B. And one or more (one in FIG. 2) convex portions 130 are provided on the bottom forming surface 151 of the punch nose 150 facing the surface that becomes the bottom of the cup of the plate material. The convex portion 130 is composed of a substantially cylindrical embossing portion 132 and a spacer 131 for installing the embossing portion 132 in a state of extending downward from the ceiling surface 153 of a disk-shaped concave space 152 formed at the lower part of the punch nose 150. The tip (the lower end in FIG. 2) of the embossing portion 132 faces the upper surface of the plate material (blank B). By pressing the embossing portion 132 against the surface of the plate material, an emboss can be formed on the surface. The convex portion 130 may be integrally formed with the punch nose 150, or may be configured as a separate component and fixed to the punch nose 150 by various fasteners. The embossing portion 132 only needs to be provided at a position where an emboss can be formed at a desired position on the bottom of the obtained cup. Also, the protruding height from the lowermost end surface (the broken line in FIG. 2) of the bottom forming surface 151 of the embossing portion 132 varies depending on the plate thickness of the plate material, and may be any size that can obtain the protruding height of the desired emboss from the outer bottom surface of the cup. In the example of FIG. 2, the distance d from the axis center X of the punch nose 150, which is the axis center of the cup, to the axis center Y of the embossing portion 132 of the convex portion 130 is 20 mm, the diameter of the embossing portion 132 is 0.5 mm, and the protruding height from the lowermost end surface of the bottom forming surface 151 of the embossing portion 132 is 0.5 to 0.7 mm.

[0021] In the example of FIG. 2, only one capping press die 100 composed of a punch nose 150, a blank punch 120, a draw pad 190, etc. is shown, but a plurality of them are provided at intervals in the extending direction (horizontal direction) of the long plate material, and it is configured to be able to manufacture a plurality of cups in one cycle of the capping press from one plate material. Each capping press die 100 is capable of forming embosses in different states. Specifically, each capping press die 100 can be identified from each other by the number, shape, forming position of the emboss, or a combination of these.

[0022] In such a die 100 for a capping press, while the plate material is being conveyed and set at a predetermined position between the blank punch 120 and the draw pad 190, the blank punch 120 is lowered. By the relative movement between the descending blank punch 120 and the fixed draw pad 190, the plate material is cut between the cut end mechanism of the blank punch 120 and the annular draw pad 190 and punched out as a circular blank B. With the punched blank B clamped between the blank punch 120 and the draw pad 190, the punch nose 150 is lowered, so that the punch nose 150 engages with the blank B and a drawing process is performed to form a cup having a shape corresponding to the outer contour shape of the punch nose 150. Simultaneously with the drawing process, the convex portion 130 is also lowered and the tip of the embossing portion 132 abuts against the upper surface of the blank B, and since this embossing portion 132 is pressed toward the blank B, embossing is performed by the embossing portion 132 at a predetermined position on the upper surface of the blank B to form an emboss, whereby a cup is obtained. The obtained cup is subjected to DI processing and can bottom forming processing in a body manufacturer. Since a tool does not hit or partially hits the emboss at the bottom of the cup in these processing steps, the emboss P remains visibly. Further, by performing a conventional cleaning treatment, inner and outer surface coating, and necking and flanging processing, a can body having one or more embosses on the bottom surface can be manufactured.

[0023] Each cup, can body, and finally the two-piece can C obtained as described above have an emboss on the bottom surface as shown in FIG. 1. Since the number and shape of this emboss and the forming position with respect to the rolling direction of the plate material differ for each corresponding die for a capping press, the corresponding die 100 for a capping press can be specified based on these.

[0024] As described above, the container according to one embodiment of the present invention has been described in detail. However, one embodiment of the present invention is not limited to the above-described embodiment, and various changes can be made within the scope of the gist of the present invention described in the claims.

Explanation of reference numerals

[0025] 100 ··· Die for capping press 120 ··· Blank punch 120H··· Through-hole 130 ··· Convex part 131 ··· Spacer 132 ··· Marking part 150 ··· Punch nose 151 ··· Bottom forming surface 152 ··· Concave space 153 ··· Ceiling surface 190 ··· Draw pad B ··· Blank C ··· Two-piece can P ··· Emboss R ··· Grounding part X ··· Axis center Y ··· Axis center

Claims

A cup manufactured using a capping press that is a precursor for manufacturing a can body for a two-piece can by a body manufacturer in a subsequent process, wherein the cup is a bottomed cylindrical shape having a bottom portion and a body portion, wherein the bottom portion has a plurality of embosses, wherein the embosses are located in a region within 75% radially outward from the axial center of the cup, wherein the embosses have a diameter of 0.3 to 0.5 mm and a height from the bottom of 1.0 mm or less. The cup according to claim 1, wherein the plurality of embosses are located concentrically with respect to the axial center of the cup.

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