WO2022211047A1 - Metal container - Google Patents

Abstract

Provided is a metal container having a body portion, an edge portion having a curled part, and a base portion having a tapered erect part. The body portion has a lower cylindrical part connected to the erect part, a lower step part connected to the upper end of the lower cylindrical part, and a tapered cylinder that is connected to the upper end of the lower step part and has a tapered surface that gradually expands in diameter with increasing proximity to the edge portion. The connecting section between the erect section and the lower cylindrical part comprises a first curved surface in which the outer surface is protruding. The lower step part comprises a lower connected curved surface having: a second curved surface that is connected to the lower cylindrical part and has a recessed outer surface; and a third curved surface that is connected to the second curved surface and to the lower end of the tapered cylinder and that has a protruding outer surface. When two of said metal containers are stacked, the inside metal container is supported in a state in which the outer surface of the first curved surface of the inside metal container is in contact with the inner surface of the lower connected curved surface of the outside metal container.

Description

metal container

The present invention relates to a metal container made of an aluminum alloy or the like. This application is based on Japanese Patent Application No. 2021-063327 filed on April 2, 2021, Japanese Patent Application No. 2021-090090 filed on May 28, 2021, and Japanese Patent Application filed on August 5, 2021. 2021-129299, the contents of which are hereby incorporated by reference.

Existing drinking cups are made of ceramic, glass, metal, paper, plastic, etc. Of these, cups (tumblers) made of metal, paper, or plastic are lighter than those made of ceramics or glass, and are not bulky even when stacked, so they are excellent in portability.

When selling or providing beverages at event venues, etc., or when taking home beverages provided at stores, etc., it is common to use disposable cups made of paper or plastic, which are thin, light, and mass-produced. be. These cups are transported and stored in a stack for space efficiency and are separated from the stack when in use. Cups such as these can also be manufactured using metal as a material.

For example, Patent Document 1 discloses a tapered metal cup. The cup is said to be made of aluminum, which is harder, more durable and more recyclable than plastic cups. The inner diameter of the curl formed at the open end is stated to be between 2.0 inches and 5.0 inches in diameter.

As a method of manufacturing this cup, a metal plate is punched and drawn to form a cup, the cup is ironed to form a cylindrical vertical wall preform (DI process), and the open end is is rolled to form a curl, then a stepwise drawing process forms a vertical drawn cup with vertical wall sections of successively decreasing diameters and different heights from the curl to the bottom, and then tapered. A tapered cup is formed with tapered sidewalls for each vertical wall section by widening each of the vertical wall sections using a die having a tapered profile and finally forming a domed portion at the bottom of the cup. , is stated.

Patent Literature 2 discloses a can body to which a metal cap is wound. The curled portion formed at the opening of the can body has a cross-sectional area of 4 mm ² or more in the inner space, and a gap is formed between the outer surface of the curled portion on the proximal side and the cutting tip over the entire circumference. formed.

The outer diameter of the open end where the curled portion is provided is exemplified as 25 mm or more and 40 mm or less. Further, in a cross section along the can axis passing through the can axis, the radial distance of the gap is at least twice the plate thickness of the curled portion at the cutting tip. With such a shape of the curled portion, a gap is formed along the entire circumference of the space inside the curled portion, so that excess contents are less likely to stay in the space, and the curl can be passed through the gap of the curled portion. It is described that since the space inside the mouth can be easily washed, the appearance of the mouth can be kept beautiful and the mouth can be kept hygienic.

Japanese Patent Publication No. 2020-508874 JP 2019-172271 A

When multiple cups of Patent Document 1 are stacked, there are problems such as difficulty in separating one cup from the multiple stacked cups and easy scratching of the stacked cups.

In addition, the shape of the curled portion formed around the opening of such a cup used as a beverage container affects the comfort of drinking because it is the portion that directly touches the lips of the consumer when drinking the beverage. Compared to the can body described in Patent Document 2, in which the outer diameter of the open end is small and the area that touches the lips is limited, the cup described in Patent Document 1 has a large diameter and a laterally long area that touches the lips. Tactile sensation has a great influence on the comfort of drinking. For this reason, it is desired to have a curl portion shape that is pleasing to the palate.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a metal container that is easy to come off even when stacked and is not easily scratched, and a wide-mouthed cup-shaped metal container with a curled portion that is pleasant to the palate. for the purpose.

As a result of intensive research, the researchers found that when stacking a plurality of bottomed cylindrical metal containers in a conventional cup-shaped (tumbler-shaped) metal container, the lower part of the body of the metal container At (bottom side), since the outer surface of the inner metal cup and the inner surface of the outer metal cup are in surface contact, it is possible to pull out the inner (upper) metal cup from the outer (lower) metal cup. Then, the surface-to-surface contact becomes like a wedge, making it difficult to pull out, and scratches occur when forcibly pulling it out. I found that it was the cause of the scratches.

As a result of intensive research into the cause, the researchers determined that the shape of the contact portion between the outer surface of the body of the inner metal container and the inner surface of the body of the outer metal container should not be in surface contact. By changing the container, we found a metal container that is easy to remove even if it is stuck and is not easily scratched.

That is, the metal container of the present invention includes a substantially cylindrical body, a bottom that closes one end of the body, and an edge that opens at the other end of the body, and the body is the bottom. It has a tapered shape that expands in diameter from the edge toward the edge, and the edge has a curled portion in which the vicinity of the edge is folded back, and the body has one that protrudes outward and extends along the circumferential direction. When the two metal containers are stacked, the convex outer surface of the inner metal container comes into contact with the inner surface of the metal container along the circumferential direction, and the other The parts can be arranged in a non-contact state between the inner metal container and the outer metal container.

When multiple metal containers are stacked, only the convex outer surface of the inner metal container comes into contact with the outer metal container, making it easy to remove and less likely to be scratched when pulled out. However, the inner and outer metal containers may come into contact with each other in areas other than the convex outer surface due to slight tilting when stacked, etc., but even in such cases, it is possible to separate them in the radial direction. , the tight fitting state is suppressed.

In this metal container, the body portion has a convex inner surface that protrudes inward and extends along the circumferential direction, and when the two metal containers are stacked, the convex shape of the inner metal container It is preferable that the outer surface and the convex inner surface of the metal container are in contact along the circumferential direction.

In this case, since the convex surfaces are in contact with each other, it is easier to pull out from the stuck state.

The present invention also includes a substantially cylindrical body, a bottom closing one end of the body, and an edge opening at the other end of the body, wherein the body extends from the bottom to the edge. The edge portion has a curled portion formed by winding the vicinity of the edge radially outward. It has a tapered rising portion connected to the lowest end of the body portion, and the body portion includes a lower cylindrical portion continuing from the rising portion, a lower step portion continuing to the upper end of the lower cylindrical portion, and the lower step. a tapered cylindrical portion having a tapered surface that gradually expands in diameter toward the edge, and the connecting portion between the rising portion and the lower cylindrical portion has a convex outer surface. The lower stepped portion is composed of a first curved surface and a second curved surface that is a concave outer surface connected to the lower cylindrical portion, and a convex outer surface that connects the second curved surface and the lower end of the tapered cylindrical portion. and a lower continuous curved surface having a third curved surface, wherein when the two metallic containers are stacked, the outer surface of the first curved surface of the inner metallic container and the outer surface of the outer metallic container. The metal container supports the inner metal container while being in contact with the inner surface of the lower continuous curved surface.

In the present invention, when a plurality of cup-shaped (tumbler-shaped) metal containers are stacked, the first curved surface and the lower continuous curved surface are in contact with each other on the lower side of the metal container, and the upper end of the lower step portion Since the tapered surfaces of the connected tapered cylindrical portions gradually increase in diameter toward the edge, even when a plurality of metal containers are stacked, the tapered surfaces are separated from each other and the outer surface of the inner metal container becomes flat. surface contact with the inner surface of the outer metal container can be suppressed.

Therefore, it is easy to remove the uppermost (inner) metal container from the stacked multiple metal containers, and it is possible to prevent the lower (outer) metal containers from separating from each other. Furthermore, since the inner metal container and the outer metal container do not come into surface contact with each other, it is possible to suppress the occurrence of scratches during stacking and pulling out.

As a preferred aspect of the metal container of the present invention, the body portion has an upper cylindrical portion continuing to the curled portion and an upper stepped portion continuing to the lower end of the upper cylindrical portion, and the upper stepped portion has a fourth curved surface that is a convex outer surface connected to the lower end of the upper cylindrical portion, and a fifth curved surface that is a concave outer surface that connects the fourth curved surface and the upper end of the tapered cylindrical portion. The curled portion has an upper inner peripheral bent portion that continues to the upper end of the upper cylindrical portion and gradually expands in diameter as it goes upward. , when the fourth curved surface of the upper continuous curved surface of the inner metal container is arranged to face the height position of the upper inner curved portion of the curled portion of the outer metal container good.

When a plurality of metal containers are stacked, the fourth curved surface of the upper continuous curved surface of the inner metal container faces the height position of the upper inner peripheral bent portion in the curled portion of the outer metal container. Since the curved portion on the upper inner peripheral side of the curled portion continues to the upper end of the upper cylindrical portion and gradually expands in diameter as it goes upward, the outer surface of these upper continuous curved surfaces and the upper inner peripheral side of the curled portion Even if the outer surface of the bent portion comes into contact with the outer surface, there is no surface contact.

In other words, in the above aspect, when the lower side of the metal container is supported, if the outer surface of the upper continuous curved surface of the inner metal container on the upper side of the metal container is aligned with the outer surface of the curled portion of the outer metal container. Even if they come into contact with each other, the curved surfaces prevent them from being firmly fitted together, preventing the metal container from becoming difficult to come off, and preventing scratches during stacking and pulling out. can be suppressed.

In addition, when the outer surface of the upper continuous curved surface and the outer surface of the curled portion are in contact on the upper side of the metal container, the metal container is supported on the lower side and the metal containers stacked on the upper side are prevented from wobbling. can be suppressed.

As a preferred embodiment of the metal container of the present invention,
the radius of curvature of the outer surface of the first curved surface is 2.0 mm or more and 10.0 mm or less;
the radius of curvature of the inner surface of the second curved surface is 2.0 mm or more and 24.0 mm or less;
The radius of curvature of the inner surface of the third curved surface is preferably 3.0 mm or more and 26.0 mm or less.

As a preferred embodiment of the metal container of the present invention,
the curvature radius of the outer surface of the fourth curved surface is 2.0 mm or more and 10.0 mm or less;
It is preferable that the curvature radius of the outer surface of the fifth curved surface is 3.0 mm or more and 22.0 mm or less.

As a preferred embodiment of the metal container of the present invention, in a longitudinal section along the central axis of the body portion, the curled portion is continuous with the upper inner peripheral side bent portion and the outer peripheral end of the upper inner peripheral side bent portion. an upper outer circumference bending portion that forms a zenith folded portion between itself and the upper inner circumference bending portion and bends downward; and a curled end continuous with the lower bent portion, and the curvature radius of the outer surface of the upper inner peripheral side bent portion is preferably 0.8 mm or more and 5.0 mm or less.

As a preferred aspect of the metal container of the present invention, the inclination angle of the tapered surface with respect to the plane perpendicular to the central axis of the body is 80° or more and 88° or less.

If the angle of inclination of the tapered surface with respect to the plane perpendicular to the central axis is less than 80°, the body expands too much toward the edge, which may increase the volume of the can and deteriorate its balance. If the angle exceeds 88°, when a plurality of metal containers are stacked, the outer surface of the tapered surface of the inner metal container may come into surface contact with the inner surface of the tapered surface of the outer metal container.

The metal container of the present invention has a body portion, a bottom portion that closes one end of the body portion, and an edge portion that opens at the other end of the body portion. A gap is provided between the edge and the vicinity of the starting end of the curled portion, and the curled end including the edge is aligned with the center of the plane orthogonal to the central axis of the body. It is inclined upward toward the axis, and the height W is the width T, where W is the height of the curled portion along the central axis, and T is the width of the curled portion along the radial direction. less than

In this metal container, the height W and the thickness T of the curled portion satisfy W<T. Lips are also hard to touch near the edge, so there is no sense of discomfort and the mouthfeel is good.

In addition, since a gap is formed between the edge of the curled portion and the outer surface of the upper end portion of the body portion, even if water or the like enters the curled portion due to washing or the like, it can be quickly discharged.

In this metal container, when the height along the central axis from the lower end of the curled portion to the edge on the outer surface side of the curled portion is X, (1/20)×W<X<(1/2) )×W.

By regulating the position of the edge in this way, it is possible to facilitate the discharge of water, etc. that has entered the curled portion while ensuring a good mouthfeel. If the height X is (1/20)×W or less, the lower lip may hit the edge when drinking a beverage. On the other hand, when the height X is (1/2)×W or more, it becomes difficult to discharge water or the like that has entered the curled portion.

Further, regarding the gap between the vicinity of the starting end portion and the vicinity of the edge of the curled portion, when the distance along the plane orthogonal to the central axis is B, (1/20)×T<B<(1/2) )×T.

If the distance B is (1/2)×T or more, the edge may hit the lower lip when drinking a beverage. On the other hand, when the distance B is (1/20)×T or less, it becomes difficult to discharge water or the like that has entered the curled portion.

In this metal container, the height W is preferably 1.2 mm or more and 4.0 mm or less.

In this metal container, the angle formed by the curled end with the plane is preferably 5° or more and 80° or less.

If the angle of the curled end is less than 5°, when the lower lip is applied to the curled part, the vicinity of the edge is also likely to touch the lip, which reduces the mouthfeel. If the angle exceeds 80°, curling becomes difficult.

In a longitudinal section passing through the central axis, the curled portion of the metal container includes an upper inner peripheral curved portion that continues to the upper end of the body portion and gradually expands in diameter as it goes upward, and the upper inner peripheral curved portion. an upper outer circumference bent portion that is continuous with the outer circumference end of the portion and forms a zenith folded portion with the upper inner circumference bend portion and bends downward; A lower bent portion that is convex obliquely downward and the curled end portion that is continuous with the lower bent portion, and the curvature radius of the outer surface of the upper outer peripheral side bent portion is 1.0 mm or more and 5.0 mm or less. .

Combined with the small height of the curled portion described above, the curvature radius of the outer surface of the upper outer peripheral side bent portion is as small as 1.0 mm or more and 5.0 mm or less, so the curled portion has high rigidity and the opening of the wide-mouthed cup It is possible to prevent deformation and the like from occurring even if it is applied to

In this metal container, the outer surface of the lowermost portion of the curled portion formed by the lower curved portion is preferably a curved surface with a radius of curvature of 0.5 mm or more and 10 mm or less, and the rounded shape makes it easy to touch the lips. Discomfort can be further alleviated.

This metal container includes a tapered surface portion that forms the starting end portion of the upper inner peripheral curved portion and that has a substantially linear shape in a longitudinal section passing through the central axis.

By forming a tapered surface part in a part of the upper inner circumference side bent part, the rigidity of that part is improved, and further deformation etc. can be prevented. In this case, since it is the upper inner peripheral curved portion and the contact with the lips is small, there is little discomfort when drinking the beverage.

In this metal container, the upper end of the body is preferably cylindrical along the central axis.

The curled portion is formed by applying a mold to the edge before curling and pressing it along the central axis of the trunk. Deformation such as buckling is less likely to occur even if a load is applied from the center, and therefore accurate curling is possible.

According to the present invention, it is possible to provide a metal container that is easy to come off even when stacked and is not easily scratched, and a curled portion that is pleasant to the mouth even in a wide-mouthed cup-shaped metal container.

1 is a front view of a metal container (cup) of one embodiment of the present invention, with half taken as a vertical cross section centering on the central axis; FIG. 2 is an enlarged cross-sectional view of the curled portion of the cup of FIG. 1; FIG. In the cylindrical body forming process, the cup obtained in the cup forming process (FIG. 3A), the cylindrical body obtained in the drawing and ironing process (FIG. 3B), and the intermediate cylindrical body obtained in the diameter expanding process (FIG. 3C), respectively It is the front view which made half the vertical cross section centering on a central axis. FIG. 4 is a vertical cross-sectional view of a main part showing a state in which processing is being performed with a stepped punch after forming a lower stepped portion; It is a longitudinal cross-sectional view of the main part showing a stepped portion forming step. FIG. 6 is a vertical cross-sectional view of a main part showing a shaping step following the stepped portion forming step of FIG. 5 ; FIG. 7 is a vertical cross-sectional view of a main part showing a step forming step following the shaping step of FIG. 6 ; It is sectional drawing of the principal part which shows a pre-curling process. FIG. 4 is a cross-sectional view showing a state of processing with a curling tool in a curling process; It is the figure which looked at FIG. 9 from upper direction. FIG. 4 is a cross-sectional view of a main part showing the initial state of the curling process. FIG. 4 is a cross-sectional view of a main part showing a state in which a curled portion is formed in a curling process; FIG. 12 is a cross-sectional view of a main part showing a state in which the position of the curling tool is moved from the state shown in FIG. FIG. 14 is a cross-sectional view showing a curled portion formed by the processing shown in FIG. 13; FIG. 2 is a view showing a state in which three cups shown in FIG. 1 are stacked, and is a cross-sectional view showing only the right half of the central axis; FIG. 16 is an enlarged cross-sectional view showing the bottom side of the cup in a state where three cups shown in FIG. 15 are stacked; FIG. 16 is a cross-sectional view showing an enlarged opening side of the cups in a state where three cups shown in FIG. 15 are stacked; FIG. 10 is a diagram showing a state in which three cups of the second embodiment are stacked, the opening side is in contact and the bottom side is not in contact, and is a cross-sectional view showing only the right half of the central axis. FIG. 4 is an X-ray image of the bottom side of three stacked cups in an embodiment of the present invention; FIG. FIG. 4 is an X-ray image of the mid-abdominal side in a state in which three cups are stacked in an embodiment of the present invention; FIG. It is an X-ray image of the opening side in a state in which three cups are stacked in the embodiment of the present invention.

A first embodiment of a metal container according to the present invention will be described below with reference to the drawings.

The metal container of the first embodiment is a wide-mouthed cup 1 as shown in FIG. As shown in FIG. 1, the cup 1 is formed by pressing a metal plate made of aluminum or an aluminum alloy into a tubular shape with a bottom. It has a closed bottom 2 and an open edge 3 at the other end of the body 4 . In this cup 1, the diameter of the rim 3 is larger than the diameter of the bottom 2, and the body 4 is tapered so that the diameter gradually increases from the bottom 2 toward the rim 3. As shown in FIG. The edge portion 3 has a curled portion 5 formed by winding the vicinity of the edge E radially outward. A central axis C is the center of the cup 1 in the radial direction.

The bottom portion 2 includes a dome portion 6 curved in a concave shape, an inner tapered wall portion 7 continuous with the outer peripheral edge of the dome portion 6 and gradually increasing in diameter downward in the central axis direction, and connected with the outer peripheral edge of the inner tapered wall portion 7 to form a cup. It has a shape in which a rim portion 8 that touches the ground when 1 is placed on a table or the like, and a tapered rising portion 9 that connects from the outer peripheral end of the rim portion 8 to the lowest end of the body portion 4 are continuous.

The dome part 6 has a concave shape where the distance from the tip of the rim part 8 is the largest on the central axis C. The rim portion 8 is provided in a ring shape around the central axis C on a curved surface that is convex downward, and the most projecting position of the rim portion 8 touches the ground. The outermost edge of the bent surface of the rim portion 8 has a smaller diameter than the lowermost edge of the body portion 4, which has the smallest diameter. are connected by

The trunk portion 4 has straight cylindrical portions 11 and 12 along the central axis C near the bottom portion 2 and near the edge portion 3 . The lower cylindrical portion 11 continues from the bottom, and a lower stepped portion 13 is provided in a small range at the upper end of the lower cylindrical portion 11 . The upper cylindrical portion 12 continues to the lower portion of the curl portion 5, and an upper stepped portion 14 is provided in a small area at the lower end of the upper cylindrical portion 12. As shown in FIG. Between the upper end of the lower stepped portion 13 and the lower end of the upper stepped portion 14 is a tapered tubular portion 15 whose diameter gradually increases from the bottom to the top.

Specifically, the body portion 4 includes a lower cylindrical portion 11 that continues from the rising portion 9 , a lower step portion 13 that continues to the upper end of the lower cylindrical portion 11 , and an upper end of the lower step portion 13 that continues to the edge portion 3 . a tapered cylindrical portion 15 having a tapered surface whose diameter gradually increases toward the top; and a cylindrical portion 12 .

In the longitudinal section along the central axis C of the cup 1 (see FIG. 16), the connecting portion between the rising portion 9 and the lower cylindrical portion 11 is formed of a first curved surface 91 having a convex outer surface. The curvature radius R11 of the outer surface of the first curved surface 91 is set to 2.0 mm or more and 10.0 mm or less.

The lower stepped portion 13 has a second curved surface 131 with a concave outer surface connected to the lower cylindrical portion 11 and a third curved surface 132 with a convex outer surface connecting the second curved surface 131 and the lower end of the tapered cylindrical portion 15 . It consists of a lower continuous curved surface 13A having a The radius of curvature R12 of the inner surface of the second curved surface 131 is 2.0 mm or more and 24.0 mm or less, and the radius of curvature R13 of the inner surface of the third curved surface 132 is 3.0 mm or more and 26.0 mm or less.

Although details will be described later, for example, when a plurality of cups 1 are stacked as shown in FIG. The inner surface of the second curved surface 131 of 13A contacts, and the inner cup 1 is supported in the outer cup 1 by the contact portion.

In a vertical cross section along the central axis C of the cup 1 , the upper stepped portion 14 includes a fourth curved surface 141 that is a convex outer surface connected to the lower end of the upper cylindrical portion 12 , and the fourth curved surface 141 and the tapered cylindrical portion 15 . It consists of an upper continuous curved surface 14A having a concave outer fifth curved surface 142 connecting the upper end. The curvature radius R14 of the outer surface of the fourth curved surface 141 is set to 2.0 mm or more and 10.0 mm or less, and the curvature radius R15 of the outer surface of the fifth curved surface 142 is set to 3.0 mm or more and 22.0 mm or less.

Although details will be described later, for example, when a plurality of cups 1 are stacked as shown in FIG. are arranged to face each other.

(various dimensions)
Height H3 from the bottom surface to the lower end of the lower stepped portion 13: 10 mm or more and 30 mm or less Length H4 from the upper end of the curled portion 5 to the upper end of the upper stepped portion 14: 8 mm or more and 25 mm
Height H31 of the lower cylindrical portion 11: 4 mm or more and 20 mm or less Height H414 mm or more of the upper cylindrical portion 12 and 20 mm or less

In the longitudinal section (FIG. 1) along the central axis C of the cup 1, the inclination angle θ2 of the tapered surface of the tapered cylindrical portion 15 with respect to the plane (horizontal plane) perpendicular to the central axis C is set to 80° or more and 88° or less. . If the inclination angle .theta.2 of the tapered surface is less than 80.degree. If the angle exceeds 88°, when a plurality of cups 1 are stacked, the outer surface of the tapered surface of the inner cup may come into surface contact with the inner surface of the tapered surface of the outer cup.

As shown in FIG. 2 , the curled portion 5 includes, in a cross section (longitudinal cross section) passing through the central axis C, an upper inner peripheral bent portion 71 that continues to the upper end of the upper cylindrical portion 12 and gradually expands in diameter as it goes upward. An upper outer circumference bent portion 73 that is continuous with the outer peripheral end of the upper inner circumference bent portion 71 and bends downward while forming a zenith folding portion 72 between the upper inner circumference bent portion 71 and the upper outer circumference bend. A lower curved portion 74 that is continuous with the outer peripheral end of the portion 73 and projects obliquely downward, and a curled end portion 75 that is continuous with the lower curved portion 74 and have an edge E are formed continuously.

The zenith folded portion 72 is arranged from the latter half portion of the upper inner peripheral side bent portion 71 to the first half portion of the upper outer peripheral side bent portion 73 . The intermediate position of the zenith folded portion 72 is the uppermost position of the curled portion 5 . The rear half of the lower bent portion 74 is the lowest position of the curled portion 5 .

A gap g is provided between the outer surface of the upper end portion of the upper cylindrical portion 12 and the outer surface of the edge E. The curled end portion 75 including the edge E is inclined with respect to a plane perpendicular to the central axis C so as to become upwardly inclined toward the central axis C. As shown in FIG.

The curled end portion 75 is continuous with the lower bent portion 74 and is slightly curved so as to protrude downward in a longitudinal section passing through the central axis C. However, since its radius of curvature is larger than the radius of curvature R5 of the lower bent portion 74 and its length is also shorter, it may be considered that it extends substantially linearly from the terminal end of the lower bent portion 74 .

The dimensions of each portion of the curled portion 5 are, for example, as follows.
Diameter of curl portion 5 (outer diameter of edge portion 3) D1: 75 mm or more and 100 mm or less Diameter D4 of upper cylindrical portion 12: 70 mm or more and 95 mm or less Radial thickness T of curl portion 5: 1.8 mm or more and 5.0 mm or less Height W of curled portion 5 along central axis C of cup 1: 1.2 mm or more and 4.0 mm or less

In this case, the height W is smaller than the thickness T (W<T). In addition, the gap g between the outer surface of the upper end of the upper cylindrical portion 12 of the body portion 4 and the edge E on the outer surface side of the curled portion 5 has a dimension B along a plane orthogonal to the central axis C of 0.1 mm or more. 0 mm or less, preferably 0.3 mm or more and 1.6 mm or less.

A height X along the central axis from the lower end of the curled portion 5 to the edge E on the outer surface side of the curled portion 5 is 0.1 mm or more and 2.0 mm or less, preferably 0.3 mm or more and 1.5 mm or less. In this case, the height X and the dimension B are (1/20)×W<X<(1/2)×W and (1/ 20) xT<B<(1/2) xT.

For each bending portion 71, 73, 74, the radius of curvature on the outer surface is set. A curvature radius R1 of the upper inner peripheral bent portion 71 is 0.8 mm or more and 5.0 mm or less.

The upper outer peripheral bent portion 73 is roughly divided into two curved portions, a front half portion and a rear half portion. the radius of curvature R3 of the rear half portion is 1.3 mm or more and 5.0 mm or less, preferably 1.5 mm or more and 3.8 mm or less;

The lower bent portion 74 is also roughly divided into two curvature portions, a front half portion and a rear half portion, and the curvature radius R4 of the front half portion is 0.5 mm or more and 2.5 mm or less; the curvature radius R5 of the rear half portion is 0.8 mm or more. It is 10 mm or less, preferably 1.0 mm or more and 5.0 mm or less. The outer surface of the lowermost end portion of the curled portion 5 is formed by a lower curved portion 74 having a radius of curvature R5.

The inclination angle θ1 of the curled end portion 75 with respect to the plane perpendicular to the central axis C of the trunk portion 4 is set to 5° or more and 80° or less, preferably 10° or more and 50° or less.

Other dimensions are not necessarily limited, but are set as follows, for example.
Diameter D2 of the grounded portion: 45 mm or more and 60 mm or less Overall height H1: 80 mm or more and 180 mm or less Depth H2 of the dome portion 6 is 1 mm or more and 15 mm or less Diameter D3 of the lower cylindrical portion 11: 50 mm or more and 70 mm or less From the bottom surface to the lower stepped portion 13 Height H3 to the lower end: 8 mm or more and 25 mm or less Length H4 from the upper end of the curled portion 5 to the upper end of the upper stepped portion 14: 8 mm or more and 20 mm or less Angle θ2 of the tapered tubular portion 15 with respect to the horizontal plane: 80° or more and 88° or less

Next, a method for manufacturing this cup 1 will be described.

This cup 1 is formed by drawing and ironing a metal plate to form a bottomed cylindrical cylinder 21, and after the cylinder forming process, a plurality of punches 40 to 42 and 43A having different outer diameters. The punches 40 to 42 and 43A are pushed into the cylindrical body 21 from the side of the open portion 22 while being used in ascending order of the outer diameter, and the body portion 23 of the cylindrical body 21 is directed from the side of the bottom portion 2 toward the side of the open portion 22. Manufactured through a diameter expansion step of gradually expanding the diameter to form a tapered intermediate cylinder 50 and a curling step of forming a curl portion 5 in the open portion of the intermediate cylinder 50 formed by the diameter expansion step. be done. The order of steps will be described below.

[Cylinder Forming Step]
In the cylindrical body forming step, as shown in FIG. 3, a plate material made of aluminum or an aluminum alloy is punched and drawn to form a cup 25 (FIG. 3A) having a larger diameter and shallower than the cylindrical body 21 in the next step. A cup forming process and a drawing and ironing process in which the cup 25 is drawn and ironed (drawn and ironed) to form a bottomed cylindrical cylindrical body 21 (FIG. 3B) having a smaller diameter than the cup 25 and a predetermined height. and

The bottom portion 2 of the cylindrical body 21 formed by the drawing and ironing process is finished in the final shape of the bottom portion 2 of the cup 1 and has a dome portion 6, an inner tapered wall portion 7, a rim portion 8, and a tapered rising portion 9. there is

[Diameter expansion process]
The diameter-expanding step consists of a plurality of steps, a stepped portion forming step of forming a stepped portion having a larger diameter on the side of the open portion 22 than the diameter on the side of the bottom portion 2 in the body portion 23 of the cylindrical body 21, and a stepped portion forming step of expanding the stepped portion. By sequentially repeating the shaping step of shaping into a tapered surface, the tapered intermediate cylindrical body 50 shown in FIG. 3C is formed.

In this case, the lower stepped portion 13 is formed at the lowermost portion of the cylindrical body 21 (lower stepped portion forming step, FIG. 4). After that, a first stepped portion forming step (FIG. 4) of forming a first stepped portion slightly above the lower stepped portion 13, a first shaping step of shaping the first stepped portion, and near the upper end of the shaped surface The stepped portion forming step and the shaping step are performed in such a manner as a second stepped portion forming step (FIG. 5) for forming the second stepped portion, a second shaping step (FIG. 6) for shaping the second stepped portion, and so on. The steps are alternately applied to form one stepped portion, and the entire stepped portion is formed into a tapered shape while shaping the stepped portion.

After each stepped portion forming step and each shaping step, that is, at the end of the diameter expanding step, an upper stepped portion forming step is performed to form the upper stepped portion 14 at the top of the cylindrical body 21, thereby performing the diameter expanding step. exit.

The details of the diameter expansion process will be described below. The shape of the cylindrical body 21 gradually changes in the diameter-enlarging process. will be described with the same reference numeral 21 as that of the cylindrical body used in the cylindrical body forming step.

(Stepped portion forming step)
In the step forming process, as shown in FIGS. 4 to 7, a plurality of stepped punches 40 to 43 having different diameters, a stepless lower stepped punch 43A and an upper stepped punch (not shown) are used. Used.

As shown in FIGS. 4 to 7 (indicated by two-dot chain lines in FIGS. 4 and 6), the stepped punches 40 to 43 have a guide portion 44 and a forming portion 45 having a larger diameter than the guide portion 44. It is formed in a continuous stepped shape, and the guide portion 44 is arranged on the tip side. The guide portion 44 is inserted into the cylindrical body 21 first, but is used for alignment with the cylindrical body 21 without forming the cylindrical body 21 .

The outer peripheral surface of the guide portion 44 of these stepped punches 40 to 43 is formed with a round chamfered surface 46 on the tip end side, and a substantially straight columnar outer surface 47 is formed from the outer peripheral end of the rounded chamfered surface 46 . The maximum diameter of the guide portion 44 of each of the stepped punches 40-43 is slightly smaller than the inner diameter of the open portion 22 of the cylindrical body 21 before the stepped portion is formed by the stepped punches 40-43 themselves.

The molding portion 45 is formed on a convex curved surface so as to protrude radially outward from the cylindrical outer surface 47 of the guide portion 44 , and has a maximum diameter larger than the diameter of the cylindrical outer surface 47 of the guide portion 44 . there is Stepped portions 51 to 53 having a larger diameter on the side of the open portion 22 than on the side of the bottom portion 2 of the cylindrical body 21 by the molded portion 45 (in FIGS. 4 to 7, the stepped portions having different molded portions are indicated by reference numerals 51 to 53). is formed.

As shown in FIG. 4, the lower stepped punch 43A is a punch that does not have a guide portion 44 like the stepped punches 40 to 43, and consists only of a forming portion 48. As shown in FIG.

The stepless lower step punch 43A is formed to have a diameter equal to or slightly smaller than that of the forming portion 45 of the stepped punch 40, which has the smallest diameter among the stepped punches 40-43. The stepless upper step punch (not shown) is formed to have a diameter equal to or slightly smaller than the maximum diameter of the shaping surface 65 of the shaping punch 61 having the largest diameter among the shaping punches 61. . Since the punch 43A for the lower step portion does not have a guide portion, the convex curved surface 48a of the molding portion 48 is formed to extend in the distal direction. The minimum diameter of the convex curved surface 48a is formed to be smaller than the inner diameter of the tubular body 21 before being formed by the punch 43A for the lower step portion.

(Shaping process)
In the shaping step (FIG. 6), the stepped portion 52 formed in the stepped portion forming step shown in FIG. 5 is shaped into a smooth tapered surface. As shown in FIG. 6, the shaping punch 61 used in this shaping process has a tip end formed with a rounded chamfered surface 62 and a tapered shape that gradually expands rearward from the tip at the rear end of the rounded chamfered surface 62 . A convex curved surface 64 with a large radius of curvature is formed on the rear end surface of the tapered surface 63 . A shaping surface 65 is defined as a region extending from the middle position of the tapered surface 63 to the front half of the convex curved surface 64 .

The shaping surface 65 of the shaping punch 61 is formed long in the distal direction so that the tip 65a can be shaped from a position far enough in the distal direction from the stepped portion 52, and the rear end 65b extends slightly behind the stepped portion 52. It is formed to a length that can be shaped.

The shaping surface 65 is not a straight tapered surface, but a tapered surface having a convex curved surface 64 that bulges slightly outward in the radial direction. With such a shape, elastic recovery (springback) when a wide area including the front and rear of the stepped portion 52 is pushed outward in the radial direction can be suppressed, and the trunk portion 23 of the cylindrical body 21 can be securely held. can be formed on a tapered surface. Therefore, in this shaping step, a wide area in front of and behind the stepped portion 52 formed in the stepped portion forming step can be shaped into a smooth tapered shape.

Following the shaping step shown in FIG. 6, a stepped portion forming step shown in FIG. 7 is further performed using a stepped punch 43 having a diameter larger than that of the stepped punch 42 . That is, a step portion 53 is further formed above the tapered portion formed in the forming step (FIG. 6) (FIG. 7).

In the steps of forming the stepped portion and the shaping step, first, as shown in FIG. 4, the lower stepped portion 13 arranged at the bottom of the body portion 4 is formed (lower stepped portion forming step). The lower stepped portion 13 is formed by a stepped punch 40 having the smallest diameter and a lower stepped punch 43A.

First, a stepped portion 51 (the stepped portion at this time is defined as an initial stepped portion) is formed near the bottom portion 2 by the stepped punch 40 . In this case, the processing is performed at a position near the bottom surface of the cylindrical body 21, and if the stepped punch 40 is used to process a position close to the bottom portion 2, there is a risk that the guide portion 44 will collide with the previously processed bottom portion 2 and deform it. Therefore, the stepped punch 40 is processed to a position where the bottom 2 is not reached. The state of processing by the stepped punch 40 is indicated by a chain double-dashed line in FIG.

Next, the lower stepped portion punch 43A is fitted into the cylindrical body 21 to move the position of the initial stepped portion 51 so as to push it downward, thereby expanding the diameter of the lower portion of the initial stepped portion 51 to form the lower stepped portion 13. . Since the punch 43A for the lower stepped portion is formed to have an outer diameter equal to or slightly smaller than that of the forming portion 45 of the stepped punch 40, it fits into the trunk portion 23 of the cylindrical body 21 expanded by the forming portion 45. and aligned with the trunk 23 . Further, since the punch 43A for the lower stepped portion does not have a guide portion, it can be closer to the bottom portion 2 than the stepped punch 40 and can form a portion not formed by the stepped punch 40.例文帳に追加

Below the lower stepped portion 13 is a portion where the outer peripheral surface of the cylindrical body 21 is held by the chuck portion 70 during the diameter expanding process (including the step of forming the lower stepped portion), and the lower cylindrical portion 11 that is not tapered. is left straight as

Next, a first stepped portion 52 is formed slightly above the lower stepped portion 13 (not shown in FIG. 5) by a stepped punch 41 having the second smallest diameter (explained with reference to FIG. 5 for convenience). . At this time, the guide portion 44 of the stepped punch 41 is inserted into the large-diameter portion of the lower stepped portion 13 to align the punch 41 with the cylindrical body 21 .

After forming the first stepped portion 52, as shown in FIG. As described above, the shaping surface 65 of the shaping punch 61 is not a straight tapered surface, but rather a curved surface that bulges slightly outward in the radial direction. It can be expanded sufficiently from the radially inner side to effectively erase the trace, and can be formed into a smooth tapered shape.

4, 5, 7) and the shaping step (FIG. 6) are repeated a required number of times, and finally, the open portion 22 of the cylindrical body 21 is formed by a punch for upper step portion (not shown). An upper stepped portion 14 is formed at a position slightly below (upper stepped portion forming step). Like the lower stepped punch 43A, this upper stepped punch also has only a forming portion 48 without a guide portion.

Since this upper stepped portion forming punch is formed to have a diameter equal to or slightly smaller than that of the shaping surface 65 of the shaping punch 61 having the largest diameter, it can be fitted without resistance from the open portion of the cylindrical body 21 formed so far. centered. Then, the top portion of the tapered surface shaped by the shaping punch 61 is processed to form the upper step portion 14 . Above the upper stepped portion 14 is a straight cylindrical upper cylindrical portion 12' (see the chain double-dashed line in FIG. 9).

After the upper stepped portion 14 is formed, the upper cylindrical portion 12' is left straight, so the shaping step is not performed. Since the tapered portion shaped in the shaping process is deformed by the guide portion 44, a punch without the guide portion 44 (punch for upper step portion) is used so as not to deform the lower portion of the upper step portion 14. ing.

Therefore, the intermediate cylindrical body 50 formed by this series of diameter-enlarging processes has a straight lower cylindrical portion 11 along the central axis C near the bottom portion 2, and an open portion 22 likewise a straight upper cylindrical portion. 12'.

[Curl part forming process]
After the diameter-expanding step, the curled portion 5 is formed by winding the end including the edge E of the upper cylindrical portion 12' of the intermediate cylindrical body 50 radially outwardly.

This curled portion forming step includes a pre-curling step in which the tip portion of the upper cylindrical portion 12' is radially expanded with a specific curvature radius, and after the pre-curling step, the edge E is reversed and expanded. It is carried out in two stages: a curling process in which the lower part is rolled up from the part.

(Pre-curling process)
In the precurling step, a precurling mold 80 shown in FIG. 8 is used. The pre-curl mold 80 includes a guide portion 81 to be inserted into the upper cylindrical portion 12', and an annular forming concave portion 82 formed at the proximal end portion of the guide portion 81 along the circumferential direction.

The forming concave groove 82 is formed in an arc-shaped concave surface in a longitudinal section passing through the axis C (Fig. 8). The intermediate cylindrical body 50 and the pre-curl mold 80 are coaxially arranged with the molding concave groove 82 facing the opening end (edge E) of the upper cylindrical portion 12', and the pre-curl mold 80 is formed along the central axis C. By inserting the guide portion 81 into the upper cylindrical portion 12' and introducing and pressing the open portion of the upper cylindrical portion 12' to the inner peripheral side of the forming concave portion 82, the end portion including the edge E is formed into the forming concave portion. A pre-curled portion 83 bent in an arc shape is formed by expanding along the inner peripheral surface of the groove 82 .

It should be noted that even in this pre-curling process, the vicinity of the edge E is difficult to process, and is formed with a slight curvature or a substantially straight shape.

(curling process)
In the curling process, as shown in FIGS. 9 and 10, a plurality of curling tools 85 are used. The curling tools 85 are rotatable around an axis C1 extending in a direction intersecting the central axis C, and are provided in plurality at equal intervals in the circumferential direction of the intermediate cylinder 50 . In the example shown in FIG. 10, six curling tools 85 are provided, and their respective axes C1 are orthogonal to the central axis C of the intermediate cylinder 50, and arranged radially around the central axis C. As shown in FIG.

Each curling tool 85 is formed with a molding groove 86 for curling molding. The forming groove 86 is formed continuously in the circumferential direction around the entire circumference of the curling tool 85, and since the curling tool 85 is arranged as shown in FIGS. placed along.

As shown in FIG. 11, in the forming groove 86, the intermediate cylindrical body 50 is rotated around the central axis C while the vicinity of the base end portion of the pre-curled portion 83 is brought into contact with the radially inner side surface of the intermediate cylinder 50, thereby forming the forming groove. By winding along the 86, the curled portion 5 is formed while the end including the edge E is folded.

In this case, the forming groove 86 is continuous with the concave arcuate surface portion 87 having an arcuate cross section and the side edge of the concave arcuate surface portion 87 on the radially inner side of the intermediate cylindrical body 50 in the direction in which the opening width of the forming groove 86 is widened. and a flat portion 89 that is continuous with the radially outer side edge of the intermediate cylindrical body 50 in the concave arc surface portion 87 and substantially orthogonal to the axis C1. A chamfered portion 90 in the shape of a convex circular arc is further continuous to the radially inner side edge of the intermediate cylindrical body 50 on the tapered surface 88 .

The curling tool 85 is rotated around the upper cylindrical portion 12 ′ while pressing the inner surface of the shaping groove 86 against the open portion of the intermediate cylindrical body 50 in the direction of the central axis C, thereby causing the inner surface of the shaping groove 86 to bend the upper cylinder. The curled portion 5 is formed by expanding and folding the end of the portion slightly lower than the edge E of the portion 12 ′ (near the base end of the pre-curled portion 83 ).

At this time, since the pre-curled portion 83 is provided in advance in the pre-curling process around the edge E and is bent in an arc shape, the edge E moves and deforms without contacting the inner surface of the forming groove 86, as shown in FIG. As shown, a small curled portion 5 can be smoothly molded. Further, since the pre-curled portion 83 increases the rigidity in the vicinity of the edge E, deformation is suppressed during the curling process. After the curling process, the pre-curled part 83 forms the curled end part 75 from the latter half of the lower bent part 74 of the curled part 5, and although the shape is slightly changed, the shape at the time of the pre-curled process is maintained.

In this curl portion forming process, the body of the intermediate cylinder 50 is also pressed axially by the precurling mold 80 in the precurling process and by the curling tool 85 in the curling process. The open portion 50 is formed by the straight upper cylindrical portion 12' along the central axis C, and the effect of work hardening due to the previous diameter expansion process causes buckling and deformation. Hateful.

The cup 1 manufactured in this manner has straight cylindrical portions 11 and 12 of a certain length near the bottom 2 and the edge 3, and most of the body portion 4 therebetween extends from the bottom 2 to the edge 3. It is formed in a tapered shape that gradually expands in diameter toward. In the manufacturing method, stepped portions 52 and 53 having a larger diameter on the side of the open portion 22 than on the side of the bottom portion 2 of the cylindrical body 21 are formed, and then the stepped portions 52 and 53 are formed into a tapered shape so as to expand. By repeating the above, the entire body portion 4 is formed into a smooth tapered shape.

　Because it is a process that spreads the metal material radially outward from the inner peripheral side, wrinkles are less likely to occur. In addition, since the stepped portions 52 and 53 are first formed and then shaped into a tapered shape, cracks are less likely to occur than when the stepped portions 52 and 53 are not formed and the tapered shape is processed. Therefore, a smooth tapered trunk portion 4 can be formed.

Also, the bottom part 2 of the cup 1 uses the bottom part 2 formed in the cylindrical body 21 with a bottom formed in the initial stage as it is, and the part above the bottom part 2 is processed to be enlarged in diameter. Therefore, the step of forming the cylindrical body 21 (cylindrical body forming step) can be carried out using the existing facilities for beverage cans as they are.

In addition, since the curled portion 5 is formed on the edge portion 3, the mouthfeel is smooth. In particular, the curled portion 5 has a height W smaller than a thickness T (W<T) and the curled end portion 75 is inclined upward. It is difficult to touch in the vicinity, so there is no sense of incompatibility and it is pleasant to the palate.

In this case, the relatively small height W of 1.2 mm or more and 4.0 mm or less also has the effect of improving the mouthfeel. If the angle θ1 of the curled end portion 75 is less than 5°, when the lower lip is applied to the curled portion 5, the vicinity of the edge E is also likely to touch the lip, resulting in poor mouthfeel. When the angle θ1 exceeds 80°, curling becomes difficult.

Further, the position of the edge E on the outer surface of the curled portion 5 is (1/20)×W<X<(1/2)×W and (1/20)×T<B<(1/2)×T , it is possible to facilitate the discharge of water or the like that has entered the curled portion while ensuring good taste. If the height X is (1/20)×W or less, or the dimension B is (1/2)×T or more, the edge E may hit the lower lip when drinking a beverage. On the other hand, when the height X is (1/2)×W or more, or the dimension B is (1/20)×T or less, it becomes difficult to discharge water or the like that has entered the curled portion 5 .

In addition, since the curvature radius R2 of the outer surface of the upper outer peripheral bent portion 73 is 1.0 mm or more and 3.0 mm or less, and the curvature radius R3 is 1.3 mm or more and 5.0 mm or less, the height W of the curled portion 5 is small. Combined with this, the curled portion 5 has high rigidity, and even if it is applied to the edge of a wide-mouthed cup, it is prevented from being deformed or the like.

In addition, since a gap g is formed between the edge E of the curled portion 5 and the outer surface of the upper cylindrical portion 12 of the trunk portion 4, even if water or the like enters the curled portion 5 due to cleaning or the like, it can be quickly removed. can be discharged. In this case, the curled end portion 75 is inclined, but the angle is small and the gap is large, so that water or the like inside can be easily discharged.

By the way, when forming the wide-mouthed intermediate cylinder 50 (D1 is 75 mm or more and 100 mm or less) as in the present embodiment by using a plurality of curling tools 85, the parts with which the curling tools 85 come into contact are locally expanded, The open portion of the intermediate cylinder 50 is not a perfect circle, and is likely to deform into a polygonal shape having corners at the contact positions of the curling tools 85 . When curling is performed using six curling tools 85 as in the embodiment, the open portion of the intermediate cylinder 50 is deformed into a hexagonal shape.

Although there is no problem with a slight degree of deformation, if the upper cylindrical portion 12' of the intermediate cylindrical body 50 is largely deformed into a polygonal shape due to, for example, a thin wall thickness, the concave arc of the forming groove 86 is maintained during the deformation. The curling tool 85 is arranged radially outward from the position shown in FIG. to receive

By pressing in the direction of the central axis C (the direction of the arrow A in FIG. 13), the pre-curled portion 83 of the intermediate cylinder 50 maintains contact with the tapered surface 88 even when deformed to the position indicated by the dashed line. By further pressing as indicated by arrow A in this state, the pre-curled portion 83 is guided from the tapered surface 88 to the concave arcuate surface portion 87 and folded back. As a result, it is possible to prevent the occurrence of problems such as the opening portion escaping outward in the radial direction during curl forming, resulting in poor molding and the occurrence of cracks in the opening portion, thereby forming the curl portion 5 in a desired shape. can be done.

The angle θ3 of the tapered surface 88 with respect to the direction (vertical direction) parallel to the direction of the central axis C is 50° or more and 80° or less, and the distance L of the tapered surface 88 along the radial direction of the intermediate cylinder 50 is 0.1 mm or more and 0.1 mm or more. 5 mm or less is preferable.

As shown in FIG. 14 , the curled portion 5</b>A formed in this way is pushed by the tapered surface 88 of the curling tool 85 at the starting end of the upper inner peripheral bent portion 71 . It is composed of a tapered surface portion 71a having a substantially straight surface. The angle θ4 of the tapered surface portion 71a with respect to the direction (perpendicular direction) parallel to the direction of the central axis C is 5° or more and 40° or less. The "substantially linear" of the tapered surface portion 71a includes not only a straight line but also a small curvature that can be regarded as a straight line.

In the above embodiment, six curling tools 85 were used in the curling process, but the number is not limited. It is sufficient if there are three or more.

Further, the pre-curling process may not necessarily be provided, and curling may be performed while the edge E of the upper cylindrical portion 12' of the intermediate cylinder 50 is brought into contact with the inner peripheral surface of the forming groove 86 of the curling tool 85.

In addition, in the diameter expanding step, after forming one stepped portion, this stepped portion is shaped into a tapered surface, and then a new stepped portion is formed above the stepped portion and shaped into a tapered surface. The stepped portion forming step and the shaping step were alternately repeated, but after forming a plurality of stepped portions along the central axis C by performing the stepped portion forming step a plurality of times, these stepped portions were separated from the bottom side. It is also possible to shape them sequentially one by one. It is also possible to collectively shape two or more stepped portions.

In addition, the above embodiments can be modified as appropriate without departing from the scope of the present invention.

Next, the shape of the cup 1 formed as described above will be described. When a plurality (for example, three) of cups 1 are stacked, the state shown in FIG. 15 is obtained.

As shown in FIG. 16 , in the vicinity of the bottom 2 of the cup 1 , the outer surface of the connecting portion between the rising portion 9 and the lower cylindrical portion 11 is a convex first curved surface 91 . The lower stepped portion 13 is composed of a second curved surface 131 and a lower continuous curved surface 13A having the second curved surface 131 and the third curved surface 132 . The outer surface of the first curved surface 91 of the stacked inner cup 1 and the inner surface of the lower continuous curved surface 13A of the outer cup 1 are in contact with each other.

Specifically, as shown in FIG. 16, the outer surface (convex outer surface) of the first curved surface 91 of the inner cup 1 and the second curved surface 131 forming the lower continuous curved surface 13A of the outer cup 1 The inner surface (convex inner surface) is in contact, and the inner cup 1 is supported by the outer cup 1 by the contact portion.

In this state, the inner cup 1 and the outer cup 1 can be arranged in a non-contact state, except for the contact portions described above, and can be separated even if they partially contact each other.

As shown in FIG. 17, in the vicinity of the edge 3 of the cup 1, the upper step 14 consists of an upper continuous curved surface 14A having a fourth curved surface 141 and a fifth curved surface 142. As shown in FIG. When a plurality of cups 1 are stacked as shown in FIG. 15 , the fourth curved surface of the upper continuous curved surface 14A of the inner cup 1 is positioned at the height of the upper inner curved portion 71 in the curled portion 5 of the outer cup 1 . 141 are arranged facing each other.

That is, as shown in FIG. 17, the outer surface of the fourth curved surface 141 of the inner cup 1 is brought into contact with the inner peripheral surface of the upper inner curved portion 71 of the outer cup 1 . However, the inner and outer cups 1 are not firmly fitted to each other at this portion. When viewed in a longitudinal section, even if contact is made on one side in the radial direction at the height position of the upper inner peripheral side bent portion 71 of the outer metal cup 1, a gap is formed on the opposite side and contact is made. One side can also be radially spaced apart.

Since the tapered surface of the tapered tubular portion 15 connected to the upper end of the lower stepped portion 13 gradually expands toward the edge portion 3, even when a plurality of cups 1 are stacked, the cups 1 can be While the first curved surface 91 and the lower continuous curved surface 13A are in contact with each other, the tapered surfaces are spaced apart from each other, so that surface contact between the outer surface of the inner cup 1 and the inner surface of the outer cup 1 can be suppressed.

Therefore, it is easy to remove the uppermost (inner) cup 1 from the plurality of stacked cups 1, and it is possible to prevent the plurality of lower (outer) cups 1 from being separated from each other. Furthermore, since the inner cup 1 and the outer cup 1 do not come into surface contact with each other, it is possible to suppress the occurrence of scratches on the cup 1 during stacking and pulling out.

Further, when a plurality of cups 1 are stacked, the fourth curved surface 141 of the inner cup 1 is arranged at the height position of the upper inner peripheral bent portion 71 of the outer cup 1 so as to face the upper inner peripheral side. Since the bent portion 71 continues to the upper end of the upper cylindrical portion 12 and gradually expands in diameter as it goes upward, the outer surface of the upper continuous curved surface 14A and the inner peripheral surface of the upper inner peripheral side bent portion 71 are assumed to be Even if they come into contact with each other, they do not become surface contact.

That is, in this embodiment, when a plurality of cups 1 are stacked, if the outer surface of the upper continuous curved surface 14A of the inner cup 1 on the upper side of the cup 1 contacts the outer surface of the curled portion 5 of the outer cup 1 However, since both of them are composed of curved surfaces, it is possible to prevent them from being firmly fitted together, to prevent the cup 1 from being difficult to come off, and to prevent scratches when stacking and pulling it out. You can prevent it from happening.

In addition, when the outer surface of the upper continuous curved surface 14A and the outer surface of the curled portion 5 are in contact with each other on the upper side of the cup 1, the cup 1 is supported on the lower side while suppressing the wobble of the cup 1 stacked on the upper side. can.

Between the outer surface of the fourth curved surface 141 of the inner cup 1 and the inner peripheral surface (the surface facing radially inward) of the upper inner peripheral bent portion 71 of the outer cup 1, there is a plate in the radial direction. A gap having a size of 1/2 to 40 times the thickness t is formed. This gap may be formed as a sum of both sides in the radial direction, and when viewed in a longitudinal section, the gap may be formed on one side in the radial direction and may be in contact with the other side. Even if they come into contact with each other on the opposite side, either the inner or outer cup 1 can be moved radially apart within the range of the gap and can be arranged in a non-contact state.

The plate thickness t in this case is the plate thickness near the open portion 22 (usually referred to as the flange portion) when the bottomed cylindrical cylindrical body 21 is formed as shown in FIG. 3B. Say. If the gap is less than 1/2 times the plate thickness t, if the roundness of the cups 1 is low, there is a risk that when a plurality of cups 1 are stacked, they will be in a fitted state, making it difficult to pull. It wobbles and is unstable when stacked. This gap is preferably 20 times or less the plate thickness t.

In addition, the above embodiments can be modified as appropriate without departing from the scope of the present invention.

In the above embodiment, when a plurality of cups 1 are stacked, the outer surface (convex outer surface) of the first curved surface 91 of the inner cup 1 and the inner surface (convex inner surface) of the second curved surface 131 of the outer cup 1 ) are in contact with each other. However, if the radius of curvature of the inner surface of the third curved surface 132 is greater than the radius of curvature of the outer surface of the first curved surface 91, the outer surface (convex outer surface) of the first curved surface 91 of the inner cup 1 and the outer The inner surface (concave inner surface) of the third curved surface 132 of the cup 1 may be contacted. Also, the outer surface (convex outer surface) of the first curved surface 91 of the inner cup 1 and the inner surface of the tapered tubular portion 15 of the body portion 4 may be in contact with each other.

Further, in the above embodiment, when a plurality of cups 1 are stacked, the first curved surface 91 of the inner cup 1 and the lower continuous curved surface 13A of the outer cup 1 come into contact near the bottom 2 of the cup 1. I made it Conversely, contact may be made near the edge 3 without contact near the bottom 2 . FIG. 18 shows a second embodiment in which there is no contact on the bottom side, but contact on the edge 3 side. In FIG. 18, the same reference numerals as in the first embodiment are used for convenience.

That is, in this second embodiment, when a plurality of cups 1 are stacked, the outer surface (convex outer surface) of the upper stepped portion 14 of the inner cup 1 and the upper inner peripheral side of the curl portion 5 of the outer cup 1 The inner peripheral surface (convex inner surface) of the bent portion 71 is in contact, and on the bottom side, the outer surface of the first curved surface 91 of the inner cup 1 and the second curved surface of the lower continuous curved surface 13A of the outer cup 1 The inner surface of 131 is in a non-contact state.

Furthermore, in any of the above-described embodiments, the bottom portion 2 has the rim portion 8 and the tapered rising portion 9, and the first curved surface 91 continues to the upper end of the rising portion 9. A shape in which the rim portion is formed directly from the trunk portion without forming the first curved surface 91 may be employed. When a plurality of stacked cups are to be contacted on the bottom side, the convex outer surface of the rim may be configured to contact the inner surface of the outer cup.

In short, when a plurality of cups (metal containers) are stacked, the convex outer surface of the inner cup is attached to the inner surface of the outer cup at one place in the central axis C direction in the longitudinal section along the central axis C. Contact may be made along the circumferential direction. Since this contact state is simply the inner cup resting on the outer cup, if the stacked cups are turned upside down, the inner cup will fall. However, the contact of the present invention includes the case where the inner cup can be pulled out with a slight force and the mated state is so slight that it can be easily pulled out.

By the method shown in the first embodiment, 300 aluminum alloy cups having the following dimensions shown in FIG. 1 were manufactured.
H1=150mm
H3=17.5mm
H31=8.7mm
H4=13.0mm
H41=10.5mm
D1=84mm
D2=48mm
D3=62mm
D4=78mm
θ2=87°
Curvature radius R11 of the outer surface of the first curved surface = 5.6 mm
Curvature radius R12 of the inner surface of the second curved surface = 17.7 mm
Curvature radius R13 of the inner surface of the third curved surface = 19.5 mm
Curvature radius R14 of the outer surface of the fourth curved surface = 7.4 mm
Curvature radius R15 of the fifth curved surface = 14.2 mm
Curvature radius R1 of the outer surface of the upper inner circumference bent portion of the curled portion = 1.4 mm

After stacking three of these cups, the vicinity of the bottom, the vicinity of the midsection, and the vicinity of the edge of the cup were photographed with an X-ray fluoroscope (manufactured by Shimadzu Corporation: SMX-1000PLUS). Note that FIG. 19 shows a captured image near the bottom of the cup, FIG. 20 shows a captured image near the midsection, and FIG. 21 shows a captured image near the edge.

As can be seen from FIGS. 19 to 21, the tapered surface of the tapered cylindrical portion connected to the upper end of the lower stepped portion gradually expands in diameter toward the edge, and when a plurality of cups are stacked, the tapered surface of the tapered cylindrical portion gradually increases in diameter. Since the first curved surface and the lower continuous curved surface are in contact on the lower side (bottom side), the tapered surfaces of the stacked cups are separated from each other, and the outer surface of the inner cup and the inner surface of the outer cup are separated. It was found that surface contact can be suppressed.

In addition, when the cups are stacked, each contact part is composed of a curved surface, so it is easy to remove the uppermost (inner) cup from the stacked cups, and the lower (outer) cup can be easily removed. It was possible to suppress the separation of multiple cups in a row. Furthermore, since the inner cup and the outer cup do not come into surface contact with each other, the occurrence of scratches during stacking and pulling out can be suppressed.

It is possible to provide a curled portion that is easy to remove even when stacked and is hard to scratch, and a wide-mouthed cup-shaped metal container.

C central axis E edge 1 cup (metal container)
2 bottom portion 3 edge portion 4 body portion 5 curl portion 6 dome portion 7 inner tapered wall portion 8 rim portion 9 rising portion 91 first curved surface 11 lower cylindrical portion 12 upper cylindrical portion 13 lower stepped portion 13A lower continuous curved surface 131 second Curved surface 132 Third curved surface 14 Upper stepped portion 14A Upper continuous curved surface 141 Fourth curved surface 142 Fifth curved surface 15 Tapered cylindrical portion 21 Cylindrical body 25 Cups 41, 42, 43 Stepped punch 43A Lower stepped punch 44 Guide portion 45 Forming portion 47 Cylindrical outer surface 48 Forming portion 48a Convex curved surface 50 Intermediate cylindrical body 51 Stepped portion (initial stepped portion)
52, 53 stepped portion 61 shaping punch 63 tapered surface 64 convex curved surface 65 shaping surface 70 chuck portion 71 upper inner peripheral bent portion 72 zenith folded portion 73 upper outer bent portion 74 lower bent portion 75 curl end portion 80 pre-curl Mold 81 Guide portion 82 Molding concave groove 83 Pre-curling portion 85 Curling tool 86 Molding groove 87 Concave arc surface portion 88 Tapered surface portion 89 Plane portion 90 Chamfered portion

Claims (17)

1. A metal container,
   A substantially cylindrical body, a bottom that closes one end of the body, and an edge that opens at the other end of the body,
   the body portion has a tapered shape that expands in diameter from the bottom portion toward the edge portion;
   The edge has a curled portion formed by folding the vicinity of the edge,
   The body has one or more convex outer surfaces protruding outward and along the circumferential direction,
   When the two metal containers are stacked, one of the convex outer surfaces of the inner metal container is in contact with the inner surface of the outer metal container along the circumferential direction, and the other portion is in contact with the inner surface of the inner metal container. A metal container, wherein the metal container and the outer metal container can be arranged in a non-contact state.
2. The metal container according to claim 1,
   The body has a convex inner surface that protrudes inward and extends along the circumferential direction,
   A metal container, wherein when two metal containers are stacked, the convex outer surface of the inner metal container and the convex inner surface of the metal container come into contact with each other along the circumferential direction. .
3. A metal container,
   A substantially cylindrical body, a bottom that closes one end of the body, and an edge that opens at the other end of the body,
   the body portion has a tapered shape that expands in diameter from the bottom portion toward the edge portion;
   The edge has a curled portion formed by winding the vicinity of the edge radially outward,
   The bottom portion has a rim portion that contacts the ground and a tapered rising portion that extends from the outer peripheral end of the rim portion to the lowest end of the trunk portion,
   The trunk portion has a lower cylindrical portion continuing from the rising portion, a lower step portion continuing to the upper end of the lower cylindrical portion, and a lower step portion continuing to the upper end of the lower step portion and gradually increasing in diameter toward the edge portion. and a tapered cylindrical portion having a tapered surface that
   a connection portion between the rising portion and the lower cylindrical portion is formed of a first curved surface having a convex outer surface;
   The lower step portion has a second curved surface that is a concave outer surface connected to the lower cylindrical portion, and a third curved surface that is a convex outer surface that connects the second curved surface and the lower end of the tapered cylindrical portion. consisting of a lower continuous curved surface having
   When the two metal containers are stacked, the outer surface of the first curved surface of the inner metal container and the inner surface of the lower continuous curved surface of the outer metal container are in contact with each other. A metal container, characterized in that it supports the metal container of
4. The metal container according to claim 3,
   The trunk portion has an upper cylindrical portion continuous with the curl portion and an upper stepped portion continuous with the lower end of the upper cylindrical portion,
   The upper step portion has a fourth curved surface that is a convex outer surface connected to the lower end of the upper cylindrical portion, and a fifth curved surface that is a concave outer surface that connects the fourth curved surface and the upper end of the tapered cylindrical portion. consists of an upper continuous curved surface having
   The curled portion has an upper inner peripheral bent portion that continues to the upper end of the upper cylindrical portion and gradually expands in diameter as it goes upward,
   When the two metal containers are stacked, the upper continuous curved surface of the inner metal container is positioned at the height of the upper inner curved portion of the curled portion of the outer metal container. A metal container characterized by having four curved surfaces facing each other.
5. The metal container according to claim 3,
   the radius of curvature of the outer surface of the first curved surface is 2.0 mm or more and 10.0 mm or less;
   the radius of curvature of the inner surface of the second curved surface is 2.0 mm or more and 24.0 mm or less;
   A metal container, wherein the radius of curvature of the inner surface of the third curved surface is 3.0 mm or more and 26.0 mm or less.
6. The metal container according to claim 4,
   the curvature radius of the outer surface of the fourth curved surface is 2.0 mm or more and 10.0 mm or less;
   A metal container, wherein the curvature radius of the outer surface of the fifth curved surface is 3.0 mm or more and 22.0 mm or less.
7. The metal container according to claim 6,
   In a longitudinal section along the central axis of the trunk,
   The curled portion is continuous with the upper inner circumference side bent portion and the outer circumference end of the upper inner circumference side bent portion, forms a zenith folded portion between the upper inner circumference side bent portion, and bends downward. an upper outer circumference side bent portion, a lower bent portion that is continuous with the outer peripheral end of the upper outer circumference side bent portion and projects obliquely downward, and a curled end portion that is continuous with the lower bent portion,
   A metal container, wherein the radius of curvature of the outer surface of the upper inner peripheral bent portion is 0.8 mm or more and 5.0 mm or less.
8. The metal container according to claim 3,
   A metal container, wherein the angle of inclination of the tapered surface with respect to a plane perpendicular to the central axis of the body is 80° or more and 88° or less.
9. having a body, a bottom closing one end of the body, and an edge opening at the other end of the body,
   The edge portion has a curled portion formed by bending the vicinity of the edge toward the outer peripheral side of the body portion,
   A gap is provided between the vicinity of the starting end of the curled portion and the edge, and the curled end portion including the edge slopes upward toward the central axis of the body with respect to a plane perpendicular to the central axis of the body. is slanted like
   A metal container, wherein the height W is smaller than the width T, where W is the height of the curled portion along the central axis, and T is the width of the curled portion along the radial direction.
10. A metal container according to claim 9,
    (1/20)×W<X<(1/2)×W, where X is the height along the central axis from the lower end of the curled portion to the edge on the outer surface side of the curled portion. A metal container characterized by:
11. A metal container according to claim 10,
    Regarding the gap between the vicinity of the starting end of the curled portion and the vicinity of the edge, when the distance along the plane orthogonal to the central axis is B, (1/20)×T<B<(1/2)× A metal container characterized by being T.
12. The metal container according to any one of claims 9 to 11,
    A metal container, wherein the height W is 1.2 mm or more and 4.0 mm or less.
13. 12. The metal container according to any one of claims 9 to 11, wherein the curled end forms an angle of 5[deg.] or more and 80[deg.] or less with the plane.
14. The metal container according to any one of claims 9 to 11,
    In a longitudinal section passing through the central axis, the curled portion continues to the upper end of the body portion and gradually expands in diameter upward, and continues to the outer peripheral end of the upper inner curved portion. an upper outer circumference bending portion that forms a zenith folded portion between itself and the upper inner circumference bending portion and bends downward; and the curled end portion that is continuous with the lower bent portion,
    A metal container, wherein the curvature radius of the outer surface of the upper outer peripheral side bent portion is 1.0 mm or more and 5.0 mm or less.
15. A metal container according to claim 14,
    A metal container, wherein the outer surface of the lowermost portion of the curled portion formed by the lower curved portion is a curved surface having a curvature radius of 0.5 mm or more and 10 mm or less.
16. A metal container according to claim 15,
    A metal container, comprising a tapered surface portion forming a starting end portion of the upper inner peripheral curved portion and having a substantially linear shape in a longitudinal section passing through the central axis.
17. A metal container according to claim 14,
    A metal container, wherein the upper end of the body is cylindrical along the central axis.
    
    

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