KR20230044499A - Container manufacturing method and container manufacturing apparatus - Google Patents

Abstract

An object of the present invention is to provide a container manufacturing method and a container manufacturing apparatus capable of easily manufacturing a container having a body having a shape extending outward as it faces the upper surface side.
The method of manufacturing the container 100 of the present invention has a bottom portion 120 and a body portion 110, a metal container having a shape in which the upper surface side is opened and the body portion expands outward as the upper surface side faces. As a method of manufacturing, the lowermost cylindrical small-diameter cylindrical portion 260 and the large-diameter cylindrical portion in which the upper surface side continuous through the stepped portion 270 is opened at the upper end of the small-diameter cylindrical portion The step cup body 200 made of metal having a cylindrical portion 280 of the step cup body has a smaller diameter than the inner diameter of the large-diameter cylindrical portion of the step cup body and a larger diameter than the inner diameter of the small-diameter cylindrical portion ( 340) and a bulge forming step of expanding the diameter by acting from the opening side of the large-diameter cylindrical portion along the cylindrical axis direction, characterized in that the bulging forming step is performed at least once.

Description

Container manufacturing method and container manufacturing apparatus

The present invention relates to a manufacturing method and apparatus for manufacturing a container made of metal having a bottom and a body and having an open upper surface.

BACKGROUND ART [0002] In order to save resources, reduce waste, and the like, there is a demand for a container that can replace containers made of paper, plastic, or the like, that is lightweight, inexpensive, and that is easy to recycle.

A metal container with an open top surface used as tableware or as a container for filling beverages, foods, etc. is known (refer to Patent Literature 1 and the like), and application thereof is contemplated.

As a well-known container with an open upper surface, there are known metal containers, such as those used for tableware, which are washed and reused many times. Since the thickness of the sheet is required, material cost and molding cost are increased, and the weight is also heavy, there are many problems in replacing containers such as paper and plastic.

In recent years, since the recycling environment of metal can containers has been established, by using a metal container of a thin material such as Patent Document 1, material cost and molding cost are reduced, and the weight is lightened, and resources are saved even if used only once as tableware. , there is a possibility of reducing waste.

However, there has been a problem that the shape and structure are not suitable for storing and transporting a metal container with an open upper surface in an empty state and for use by a user in an open state.

In addition, along with the global awareness of preventing environmental pollution, such as marine pollution by plastics, containers made from materials that are easily recovered for recycling are required.

On the other hand, to manufacture a metal container with an open top surface, as disclosed in Patent Document 2, etc., a technique for forming the body portion into a tapered shape is required. Only a part of the height direction of the body, such as a chime portion, is formed into a tapered shape, and a method of forming a wide height range of about 7 to 9 percent of the body portion of the container into a smooth tapered shape has not been established.

Japanese Unexamined Patent Publication No. 2003-128060 Japanese Unexamined Patent Publication No. 2006-224113

The present invention solves the problems as described above, and an object of the present invention is to provide a container manufacturing method and a container manufacturing apparatus capable of easily manufacturing a container having a body having a shape that widens outward as it faces the upper surface side. to be

A method for manufacturing a container according to the present invention is a method for manufacturing a metal container having a bottom portion and a body portion, the upper surface side being opened and the body portion extending outward as the upper surface side faces,

A step cup body made of metal having a lowermost cylindrical small-diameter cylindrical portion and a cylindrical large-diameter cylindrical portion whose upper surface side is opened through a stepped portion at the upper end of the small-diameter cylindrical portion. ), a diameter expansion punch having a smaller diameter than the inner diameter of the large-diameter cylindrical portion of the step cup body and a tapered molding portion having a larger diameter than the inner diameter of the small-diameter cylindrical portion in the direction of the cylindrical axis from the opening side of the large-diameter cylindrical portion It includes a bulge forming process that expands by acting along the

The said subject is solved by performing the said bulge forming process at least once.

An apparatus for manufacturing a container according to the present invention is an apparatus for manufacturing a metal container having a bottom portion and a body portion, the upper surface side being opened and the body portion extending outward as the upper surface side faces,

A step cup body made of metal having a lowermost cylindrical small-diameter cylindrical portion and a cylindrical large-diameter cylindrical portion having an upper end of the small-diameter cylindrical portion open through a step portion and an upper surface side being opened. A tapered mold portion having a smaller diameter than the inner diameter of the large-diameter cylindrical portion of the step cup body and a larger diameter than the inner diameter of the small-diameter cylindrical portion for expanding diameter by acting from the opening side of the cylindrical portion of the diameter along the direction of the cylindrical axis. It is characterized by having at least one bulge forming mold provided with a diameter-expanding punch.

According to the container manufacturing method according to the present claim 1 and the container manufacturing apparatus according to the present claim 11, by performing at least one bulge forming step of expanding the diameter of the lowermost cylindrical metal step cup body, wrinkles, body breakage, etc. Since the diameter of the step cup body can be expanded without causing damage, even when the wide height range of the body portion of the container is tapered, it has a desired smooth tapered body portion that widens outward toward the upper face side, and is made of metal. It is possible to simply manufacture a container that is easy to recycle. In addition, since a long stroke of the diameter-expanding punch becomes unnecessary, it becomes possible to achieve compactness and high-speed manufacturing equipment.

According to the container manufacturing method according to the present claim 2 and the container manufacturing apparatus according to the present claim 12, by repeating the bulge forming step a plurality of times, it is possible to reliably form a wide height range of the body portion of the container into a tapered shape. By repeating the bulge forming process 2 to 10 times, it is possible to more reliably mold a wide height range of the body portion of the container into a tapered shape.

According to the container manufacturing method according to the present claim 4 and the container manufacturing apparatus according to the present claim 14, the angle of the step portion with respect to the plane (horizontal plane) perpendicular to the axial direction of the step cup body is 0 to 60 degrees. As a result, it is possible to easily mold a wide height range of the body portion of the container into a tapered shape while suppressing the occurrence of wrinkles and the like.

According to the container manufacturing method according to the present claim 5 and the container manufacturing apparatus according to the present claim 15, the diameter of the taper-pressing part of the diameter expanding punch used in the preceding bulging forming step and the diameter expanding punch used in the subsequent bulging forming step By having the diameters of the tapered molded parts different from each other, it is possible to reliably mold a wide height range of the body of the container.

According to the container manufacturing method according to the present claim 6, when the total height of the container is 100% of the body portion, the angle of outward expansion of the line connecting the outer circumferential surface at a height of 10% and the outer circumferential surface at a height of 90% from the bottom ( By forming the taper angle of the body portion) to 2° to 15°, preferably 3° to 10°, it has high strength, suppresses rolling down when the center of gravity is raised by accommodating beverages, etc., and is easy to stack. A container having a shape that is easy to be carried by a user can be manufactured. Containers molded with a body taper angle exceeding 15 ° deteriorate storage efficiency because the distance from the container next to them increases when placed side by side in an upright state, and containers molded with a body taper angle smaller than 2 ° are stacked When the container is removed, the difficulty of separation increases due to the occurrence of jamming or the like.

Further, according to the container manufactured in this way, when two containers are stacked, a plurality of containers are stacked by setting the height of the protruding portion protruding from the lower container of the upper container to a height of 20 mm or less from the upper end of the lower container. height can be reduced.

In addition, when transporting or transporting containers such as filling equipment for beverages and foodstuffs and equipment for attaching lids, it becomes possible to transport and transport containers in a laminated state, filling and sealing beverages and foodstuffs to form cans. Efficiency in the case of manufacturing can be improved.

According to the configuration described in claim 7, by setting the plate thickness of the bottom portion to 0.20 mm or more, it is possible to manufacture a container having a low center of gravity position and good self-standing stability.

In addition, the material cost and molding cost are reduced by setting the plate thickness of the bottom portion to 0.35 mm or less and the body portion to a plate thickness of 0.10 to 0.22 mm in the range of 50 ± 10% of the height when the total height of the container is 100%. When the overall height of the container is 100%, the line connecting the outer circumferential surface with a height of 10% and the outer circumferential surface with a height of 90% from the bottom is 3° upwards, which is reduced and lightweight, and is also a suitable shape. A container formed in a shape extending outward at an angle of ~10° can be obtained.

According to the configuration described in claim 8, by setting the ratio of the protruding portion to the height of the container to 4% to 15%, the volume can be reduced while securing the ease of separation such as preventing jamming when stacking a plurality of containers. It is possible to manufacture a container with improved efficiency when stored and transported in an empty state. It becomes more suitable by making the ratio of the said protrusion with respect to the height of a container into 5% - 9%.

According to the configuration described in the present claim 10, by reducing the number of contact points between the body and other containers when stacking them with other containers, and having a contact portion that prevents them from coming into close contact with other containers, when a plurality of containers are stacked, the body portions do not face each other. Adhesion is reliably prevented, and when separating a plurality of overlapping containers from each other, non-contact is made except for the contact portion, so that the circulation of air between the containers can be improved, so that a container with improved ease of separation can be obtained.

1 is a side view of a container manufactured by a container manufacturing method according to an embodiment of the present invention.
Fig. 2A is a side view of a step cup body used in the container manufacturing method of the present invention.
Fig. 2B is a side view of another step cup body used in the container manufacturing method of the present invention.
3A is a schematic diagram for explaining a method for manufacturing a container according to an embodiment of the present invention.
Fig. 3B is a schematic diagram for explaining a method for manufacturing a container according to an embodiment of Fig. 3A;
Fig. 3c is a schematic diagram for explaining a method for manufacturing a container according to an embodiment of Fig. 3a;
Figure 4 is a side view of the container of Figure 1 stacked.
5 is an enlarged partial cross-sectional view of the stacked containers of FIG. 4;
6A is a schematic diagram for explaining a method for manufacturing a container according to another embodiment of the present invention.
Fig. 6B is a schematic diagram for explaining a method for manufacturing a container according to another embodiment of Fig. 6A;
Fig. 6C is a schematic diagram for explaining a method for manufacturing a container according to another embodiment of Fig. 6A;

A container manufactured by the container manufacturing method of the present invention is described below.

As shown in FIG. 1, the container manufactured by the container manufacturing method of the present invention has a bottom part 120 and a body part 110, and is made of metal and has an upper opening 101 with an open upper surface side. It is a container 100 having a shape that can be replaced with a known paper cup or plastic cup.

The body portion 110 of the container 100 has a tapered portion 111 of an inverted truncated cone shape (taper shape) that widens outward as it goes upward (upper opening 101 side), and an upper portion from the taper portion 111. It has an upper side portion 113 continuing to the opening 101 and a lower side portion 114 extending from the tapered portion 111 to the bottom portion 120 . The tapered portion 111 of the body portion 110 has, for example, a constant tapered shape of a straight line in cross section, and its angle θ is 5°.

Further, the upper side portion 113 and the lower side portion 114 do not spread outward and have a substantially cylindrical shape.

The tapered portion 111 of the container 100 is, for example, a horizontal surface when the container 100 is placed on a horizontal surface with the bottom portion 120 downward when the overall height of the container is 100%. From the height of 10% to the height of 90%, since it is formed with a uniform outward widening angle, the outer circumferential surface of the height of 10% from the bottom and the height of 90% of the height when the total height of the container is 100% The outward widening angle (body taper angle) of the line joining the outer circumferential surface is about 5°, which is almost equal to θ.

In this embodiment, the bottom part 120 is formed in the same shape as a well-known two-member beverage can.

In addition, the periphery of the upper opening 101, that is, the upper end of the body portion 110, is molded into a shape in which a sharp cross section does not directly close to the mouth, for example, a curl shape for use as a cup.

An embodiment (first embodiment) of the method for manufacturing a container of the present invention is described below.

The container 100 includes a step cup body forming step in which a step cup body 200 is obtained by forming a metal plate member (blank) into a stepped shape having a bottom and having two large diameter and small diameter cylindrical portions, and the obtained step cup body. A bulge to form a tapered portion 111 that widens outwardly toward the upper opening 101 by bulging the small-diameter cylindrical portion of 200 to widen in diameter toward the opening end 201 side. Including the molding process. After the bulge molding process, a curl molding process in which curl molding is performed on the upper end of the body portion 110 to make it round is performed. In addition, the curl forming process may be performed before the bulge forming process or in the middle of a plurality of bulge forming processes.

As shown in FIG. 2A , the step cup body 200 has two cylindrical portions 260 and 280 of a small diameter and a large diameter connected by a stepped portion 270 . The small-diameter cylindrical portion 260 becomes the lowermost cylindrical shape, and the large-diameter cylindrical portion 280 continues to the upper end of the small-diameter cylindrical portion 260 through the stepped portion 270, the upper surface. It becomes a shape in which the side is open.

The inner diameter of the small-diameter cylindrical portion 260 is equal to the minimum inner diameter of the tapered portion 111 of the body portion 110 of the desired container 100. In addition, the inner diameter of the large-diameter cylindrical portion 280 is equal to the maximum inner diameter of the tapered portion 111 of the body portion 110 of the desired container 100.

The heights of the small-diameter cylindrical portion 260 and the large-diameter cylindrical portion 280 in the direction of the cylindrical axis X may be the same or different.

The stepped portion 270 is provided over the entire circumference of the step cup body 200, and has a horizontal stepped portion surface 271 at an angle of about 0° to the horizontal plane perpendicular to the direction of the cylindrical axis X.

Further, the stepped cup body may have an inclined surface at which the angle α with respect to the horizontal plane perpendicular to the direction of the cylindrical axis X is greater than 0° and is 60° or less. Specifically, as shown in the step cup body 400 of FIG. 2B , three cylindrical portions of small diameter, medium diameter, and large diameter are respectively connected by two stepped parts 450 and 470 spaced apart in the height direction. has (440, 460, 480). The smallest diameter cylindrical portion 440 becomes the bottommost cylindrical shape, and the medium diameter cylindrical portion 460 continues at the upper end of the small diameter cylindrical portion 440 through the stepped portion 450, and The large-diameter cylindrical portion 480 is continuous to the upper end of the medium-diameter cylindrical portion 460 via the stepped portion 470, and has an open upper surface. Further, the stepped portion surfaces 451 and 471 of the two stepped portions 450 and 470 each become inclined surfaces that incline at an angle α in a state in which they face downward in a radially inner direction in the direction of the cylindrical axis X. . The inner diameter of the small-diameter cylindrical portion 440 is equal to the minimum inner diameter of the tapered portion 111 of the body portion 110 of the desired container 100 . In addition, the inner diameter of the large-diameter cylindrical portion 480 is equal to the maximum inner diameter of the tapered portion 111 of the body portion 110 of the desired container 100 .

The number of stepped portions 270 (stepped portions 450 and 470) of the step cup body 200 may be one as in the example of FIG. 2A or two or more as in the example of FIG. 2B.

Note that the height position at which the stepped portion 270 (stepped portion 450, 470) is formed is not limited to the position shown in FIG. 2A or FIG. 2B, and can be appropriately determined.

In the present invention, the bulge forming step may be performed at least once and may be repeated a plurality of times.

The number of repetitions of the bulge forming step in the case of performing the bulge forming step multiple times varies depending on the desired size of the container 100, the taper angle of the body portion, and the thickness of the plate material forming the step cup body 200, but preferably 2 to 10 times, more preferably 2 to 5 times, still more preferably 2 to 4 times, particularly preferably 3 times.

If the number of repetitions of the bulge forming process is excessive, the manufacturing load or manufacturing cost increases due to the increase in the number of steps, or non-uniformity that cannot be ignored occurs in the finished size due to the large influence of the molding heat, and the yield There is a risk of low productivity. On the other hand, when the number of repetitions of the bulge forming process is too small, in the case of manufacturing the container 100 having a large size or a large body taper angle, the bulging rate in one bulge forming process is increased. By setting, there is a risk of damage such as breakage to the body 110 .

In the bulge forming step, a diameter expansion punch 300 having a taper-pressing portion 340 having a larger diameter than the inner diameter of the small-diameter cylindrical portion 260, and an outer circumferential surface of the taper-pressing portion 340 of the diameter-expansion punch 300 A manufacturing apparatus equipped with a molding die having an external tool (not shown) having an appropriate inner circumferential shape through the circumferential side wall 261 of the small-diameter cylindrical portion 260 (with respect to the tapered surface 341) is used. .

Diameter expansion punch 300 has, for example, an upright columnar cylindrical portion 350 that continues above the taper pressing portion 340 . The outer circumferential surface of the taper pressing portion 340 is a tapered surface 341 having the same taper angle over the entire circumference serving as the working surface for diameter expansion. The taper angle of the tapered surface 341 is an angle suitable for the taper angle of the body portion of the taper portion 111 of the desired container 100, and is 5° in this embodiment. The tapered surface 341 may have a convex curved surface shape or a concave curved surface shape so as to suit the desired taper angle of the body portion of the tapered portion 111 of the container 100 .

In the diameter-expanding punch 300, its maximum outer diameter is smaller than the inner diameter of the large-diameter cylindrical portion 280. Specifically, the diameter-expanding punch 300 can be loosely inserted into the large-diameter cylindrical portion 280, that is, the inner circumferential surface of the large-diameter cylindrical portion 280 and the cylindrical portion 350 of the diameter-expanding punch 300. ) has an outer contour shape such that a fine gap exists between the outer circumferential surfaces of

Diameter expansion punch 300 is capable of reciprocating with a predetermined stroke length by a drive mechanism not shown.

In the apparatus for manufacturing a container according to the present invention, a plurality of bulge forming dies using the diameter-expanding punch 300 having taper pressing portions 340 having different outer diameters are provided. And in each bulge forming process concerning the container manufacturing method of this 1st Embodiment, the diameter expansion punch 300 which has the taper pressing part 340 of a mutually different outer diameter is used. 1st time, 2nd time... , the maximum inner diameters of the taper forming part 340 of the diameter expansion punch 300 used in the nth bulge forming process are d1, d2, . . . , with dn, d1>d2>... > dn.

In addition, the taper angle of the taper surface 341 of the taper pressing part 340 of the diameter expansion punch 300 used in each bulge forming process becomes substantially the same, for example.

In addition, the minimum inner diameter of the taper pressing part 340 of the diameter expansion punch 300 used in the (n-1) bulge forming process is the taper of the diameter expansion punch 300 used in the nth bulge forming process following this. The diameter is smaller than the maximum inner diameter of the pressing portion 340 .

In addition, the length of the taper molding part 340 of the diameter expansion punch 300 used in each bulge forming process (the axial length of the taper molding part 340) is almost the same, and the specific length is the desired container 100 ) is determined by the height of the tapered portion 111 in the body portion 110 or the number of repetitions of the bulge forming process.

In addition, in each diameter expansion punch 300, the taper angle or axial length of the taper surface 341 of the taper pressing portion 340 is not limited to be substantially the same, but to the specific cup shape of the desired container 100 It is good if they are set to a size that matches each appropriate shape. For example, the tapered surface 341 may be curved. In addition, the minimum inner diameter and the maximum inner diameter of the taper-pressing part 340 of each diameter expansion punch 300 may also be set to an appropriate size according to the specific cup shape of the desired container 100, respectively.

In the bulge forming step of the container manufacturing method of the first embodiment, as shown in FIG. 3A , first, the step cup body 200 is placed in a position in which the opening end 201 side faces the pedestal 370 side, and the pedestal 370 ), and the diameter expansion punch 300 is coaxially placed on the side of the opening end 201 of the step cup body 200 in an attitude where the tapered surface 341 becomes the narrow end (inverted truncated cone shape). Next, in a state where an outside tool (not shown) is disposed outside the step cup body 200, as shown in FIG. 3B, the diameter-expanding punch 300 is driven from the opening end 201 side of the step cup body 200 to the cylindrical shaft. It is relatively moved (moved downward in Fig. 3B) to a desired position along the direction of (X). When the diameter expansion punch 300 is moved, the tapered surface 341 of the taper forming part 340 starts to contact from the corner 272 of the stepped part 270, and the stepped part 270 and the main side wall 261 A part of the diameter is enlarged in the shape of an inverted truncated cone, and at the same time, the stepped portion 270 disappears. And the movement of the diameter expansion punch 300 is stopped at the time when the upper end of the taper molding part 340 of the diameter expansion punch 300 is moved to the level position to be the upper end of the taper part 111, as shown in FIG. 3C , A new bent portion 262 is formed at a position corresponding to the lower end of the moved taper-pressing portion 340 in the small-diameter cylindrical portion 260, and the taper-pressing portion 340 of the diameter-expanding punch 300 A tapered cylindrical portion 251 of a tapered shape corresponding to the tapered surface 341 and the outer tool is formed. Further, on the side of the opening end 201 of the step cup body 200, the part where the cylindrical portion 350 of the diameter-expanding punch 300 abuts or the part where the diameter-expanding punch 300 does not abut is the container 100. It becomes the upper side part 113.

In the subsequent bulge forming process, the same action is performed using a diameter expansion die having a smaller diameter taper pressing part, and the bent portion 262 formed in the preceding bulge forming process is pressed and widened to form in the preceding bulge forming process. A new tapered cylinder part is formed in a state of being connected to each other in a tapered shape smoothly so as to overlap or adjoin the bottom part 220 side of the tapered cylinder part 251 .

In the final bulge forming step, the lower part of the small-diameter cylindrical portion 260 of the step cup body 200 remaining without the diameter expansion punch 300 moving to the end becomes the lower side portion 114 of the container 100.

By repeating the above bulge forming process, a plurality of tapered cylindrical portions 251 are smoothly continued to form a tapered portion 111, thereby having a tapered portion 111 formed at a uniform outward widening angle. The container 100 of the body part 110 is obtained.

The bulge rate by the bulge forming process is 2 to 15% at the height position corresponding to the top of the taper portion 111, although it also depends on the taper angle of the body portion of the taper portion 111 of the container 100 to be manufactured. is preferred, more preferably 3 to 7%, and in this embodiment, 5%. Further, it is preferably 1 to 10% at a height position directly below the stepped portion 270 of the step cup body 200 (top of the small-diameter cylindrical portion 260), more preferably 2 to 10%. 5%, in this embodiment it is 3%.

The bulge ratio at the height position corresponding to the top of the taper portion 111 should be the top of the taper portion 111 in the step cup body 200 (plain can) before the first bulge forming step. When L1 is the diameter of the height position to be made, and the diameter of the uppermost part of the tapered portion 111 of the container 100 after the last (nth) bulge forming step (the maximum diameter of the tapered portion 111) is A1, the formula ( 1): Bulge ratio = (A1-L1) / L1 × 100 (%). In addition, the bulge rate at the height position directly below the stepped portion 270 of the step cup body 200 is the cylindrical shape of the small diameter in the step cup body 200 (small can) before the first bulge forming step. When the diameter of the uppermost part of the portion 260 is L2 and the diameter of the height position at the top of the small-diameter cylindrical portion 260 of the container 100 after the last (nth) bulge forming step is A2, the expression (2): Expressed as bulge ratio = (A2-L2)/L2×100 (%).

It is preferable that the bulge ratio by the bulge forming step is in the range of 2 to 7% at any height position of the step cup body 200 .

Since the degree of plastic deformation decreases as the bulge ratio decreases, the tapered portion 111 having a desired tapered shape can be obtained without damage. If the bulge ratio is excessive, the metal material cannot follow plastic deformation due to processing, and there is a possibility that the taper portion 111 of the container 100 may be broken.

As the plate material, an aluminum alloy plate material having 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, similarly to a well-known aluminum alloy two-component beverage can.

By using such a plate material, when molded into a container, the bottom part where the plate thickness of the material is almost maintained has a plate thickness of 0.20 mm to 0.35 mm and a height range of 50 ± 10% when the total height of the container is 100%. The body portion 110 of the plate thickness is 0.10 ~ 0.22 mm.

When the container 100 according to the present invention is stacked, as shown in Figs. 4 and 5,

(1) Near the upper end of the outer surface of the tapered portion 111 of the upper container 100 and the upper end of the inner surface of the upper side portion 113 of the lower container 100u

(2) Near the lower end of the outer surface of the lower side portion 114 of the upper container 100 and the lower end of the inner surface of the tapered portion 111 of the lower container 100u

At least one of is contacted and overlapped, and the outer surface of the tapered portion 111 of the upper container 100 and the inner surface of the tapered portion 111 of the lower container 100u are not in close contact.

The upper end of the upper container 100 protrudes from the upper end of the lower container 100u, and the protruding height T of the projected part 112 is the height of the upper side portion 113, the lower side portion 114 It is determined by the height of, the shape of the bottom portion 120, and the like.

In the example of FIG. 4 , the protrusion height T is 8.0 mm, and the ratio of the height T of the protrusion to the height H of the container 100 is 7.1%.

Further, the upper side portion 113 and the lower side portion 114 may be formed so as to spread outward at an angle different from that of the tapered portion 111, or only one of them may be provided, or neither may be provided.

Moreover, you may form so that the upper side part 113 and the lower side part 114 may narrow inward with a reverse taper with respect to the tapered part 111.

The upper side portion 113 and the lower side portion 114 do not exist or are extremely small, and when folded, the outer surface of the bottom portion 120 of the upper container 100 and the bottom portion 120 of the lower container 100u If the inner surface of the shape can be in close contact, by installing a bead, which is an independent contact part that protrudes on the inner surface of the body portion 110 and contacts the outer surface of the container overlapped upward, of the upper container 100. The outer surface of the body portion 110 and the inner surface of the body portion 110 of the lower container 100u may be prevented from coming into close contact with each other.

The shape, direction, number, and location of the beads may be any, and they may protrude to the inner surface side or the outer surface side, or the inner and outer surfaces may be mixed.

In addition, as long as it functions as a contact part, it may be a protruding part protruding from the taper part 111 at a point or plane instead of a bead shape.

Alternatively, after filling the container 100 with a beverage or the like, it may be used as a can to which a lid member is attached.

As the lid member, any material may be used, such as a metal stay-on tab lid, a sheet made of a laminate, and a screw lid.

When the lid member is used as a stay-on-tab lid and wound on the upper end of the body, the upper end of the body of the container may be in a state in which the upper end of the body of the container has been trimmed for the body and then subjected to flanging to form a planar portion.

When the lid member is a sheet made of a laminate and bonded to the upper end of the body by heat or the like, the upper end of the body of the container may have a planar portion to secure the bonding area. Examples of the sheet made of the laminate include aluminum foil, paper, resin film, and a laminate material obtained by laminating two or more of these, and a thermal bonding layer may be further laminated. As the thermal bonding layer, a layer made of an adhesive such as a known sealant film, a lacquer type adhesive, an easy peel adhesive, or a hot melt adhesive can be employed.

When screwing the lid member to the upper end of the body portion as a screw lid, the protruding portion 112 of the upper side portion 113 or the like of the upper end of the body portion of the container may have a screw thread. A lid member with a spout having a screw thread may be wound onto the upper end of the body of the container.

By adapting the protruding portion 112 to the mounting shape of the lid member, the efficiency at the time of storing and transporting the container portion can be improved regardless of the lid member.

As mentioned above, the container manufacturing method and the container manufacturing apparatus according to the first embodiment of the present invention have been described above, but the present invention is not limited to the above-described embodiment, and within the scope of the gist of the present invention described in the claims , it is possible to add various changes.

For example, in the container manufacturing method of the present invention, the tapered portion of the body portion is not limited to a container formed in a shape where the taper angle of the body portion extends outward at an angle of 2 ° to 15 ° at any location, and locally Like the upper side or lower side of the present embodiment, a container in which a part outside the range of 2 ° to 15 ° exists, or a curved container in which the angle gradually changes in cross section when the outward extension of the body portion is present, A container having a body portion in which a linear widening, a curved widening, a stepped portion, etc. are combined, such as a container having a plurality of stepped portions formed on the body portion, can also be manufactured.

In addition, for example, it is not limited to dividing the body portion 110 in the height direction and forming in each bulge forming process as in the first embodiment, and dividing the desired final body portion taper angle to each bulge forming process In the body portion 110 may be molded so as to gradually widen in the transverse direction. The manufacturing method of the container according to the second embodiment will be described below.

In each bulge forming step of the container manufacturing method of the second embodiment, a desired length equal to the height of the tapered portion 111 of the body portion 110 of the container 100 (the axial length of the taper molding portion) is A diameter-expanding punch is used, which has tapered faces of different taper angles, and has taper-pressing portions in the shape of an inverted truncated cone having different outer diameters. 1st time, 2nd time... , θ1, θ2, . , with θn, θ1<θ2<… <θn. Moreover, the 1st time, the 2nd time... , d1, d2, . , with dn, d1<d2<… <dn.

The taper angle (θ (n-1)) of the diameter expansion punch used in the (n-1) bulge forming process and the taper angle (θn) of the diameter expansion punch used in the nth bulge forming process following this The angle difference is about 2.5°, for example. In the container manufacturing method of the second embodiment, the taper angle with respect to the diameter expansion punch used in the first bulge forming step is 2.5°, and the taper angle with respect to the diameter expansion punch used in the second (last) bulge forming step is is 5°.

In the bulge forming step of the container manufacturing method of the second embodiment, as shown in FIG. 6A , first, a step cup body 500 having one stepped portion 570 having an inclined stepped portion surface 571 is formed at an opening end (501) side is placed on a pedestal (not shown) with the posture facing the pedestal 370 side, and a diameter expansion punch (not shown) is applied to the open end 501 side of the step cup body 500 with the tapered surface at the end. It is placed coaxially in a posture that becomes a narrow part (inverted truncated cone shape). Next, in a state where an outside tool (not shown) is disposed outside the step cup body 500, the diameter expansion punch is relatively moved along the direction of the cylindrical shaft X from the side of the opening end 501 of the step cup body 500. (Move downward in Fig. 6A), and the movement of the diameter-expansion punch is stopped when all of the surfaces to be the tapered portion 111 are moved to a level position where the diameter-expansion punch is expanded by the tapered surface of the diameter-expansion punch. When the diameter-expansion punch is moved, as shown in FIG. 6B, the tapered surface of the taper-pressing part of the diameter-expansion punch starts contacting from the edge 573 on the inner peripheral side of the stepped portion 570, and as the diameter-expanding punch moves, the stepped portion ( 570), a part of the edge 573 on the inner circumference side is enlarged and disappears, and a new stepped portion 590 is formed by the remaining edge 593, and at the same time, the taper angle (taper angle ( The taper cylindrical portion 551 is formed by expanding the diameter along θ1) in the shape of an inverted truncated cone.

In the subsequent bulge forming step, the same action is performed using a diameter expanding punch having a taper forming portion with a larger taper angle (taper angle θ2), and as shown in FIG. 6C, in the preceding bulge forming step, A part of the remaining edge 593 of the portion 590 is enlarged and disappears, and at the same time, the tapered cylindrical portion 551 formed in the preceding bulge forming process is additionally enlarged and the taper angle (taper angle) of the taper surface of the used diameter expansion punch A new tapered cylindrical portion 552 (body portion 110) having a larger taper angle (taper angle θ2) along the angle θ2 is formed.

By repeating the above bulge forming process until the stepped portion disappears, the body portion 110 is gradually expanded in the transverse direction to become a tapered portion 111, thereby forming a uniform outward widening angle. A container 100 of a body portion 110 having a tapered portion 111 is obtained.

100, 100u: container
101: upper opening
110: body part
111: taper part
112: protrusion
113: upper side
114: lower side
120: bottom
200: step cup body
201: opening end
251: tapered cylindrical portion
260: small-diameter cylindrical portion
261: main side wall
262: bend
270: stepped part
271: stepped side
272: corner
280: large-diameter cylindrical portion
300: diaphragm punch
340: taper molding
341: tapered surface
342: bottom surface
350: cylindrical part
370: pedestal
400: step cup body
440: small-diameter cylindrical portion
450: stepped part
451: stepped side
460: cylindrical portion of medium diameter
470: stepped part
471: stepped side
480: large-diameter cylindrical portion
500: step cup body
501 Open end
551, 552: tapered cylindrical portion
570, 590: stepped portion
571: stepped side
573, 593: corner
θ: angle of the taper
H: height of container
T: overhang height
X: cylindrical shaft

Claims (15)

A method for manufacturing a metal container having a bottom portion and a body portion, the upper surface side being opened and the body portion extending outwardly as the upper surface side faces,
A step cup body made of metal having a lowermost cylindrical small-diameter cylindrical portion and a cylindrical large-diameter cylindrical portion with an upper end of the small-diameter cylindrical portion open through a step portion and an upper surface side being open, A diameter expansion punch having a diameter smaller than the inner diameter of the large-diameter cylindrical portion of the cup body and a tapered pressing portion larger than the inner diameter of the small-diameter cylindrical portion acts along the cylindrical axis direction from the opening side of the large-diameter cylindrical portion to expand the diameter Including a bulge forming process to do,
The container manufacturing method characterized by performing the said bulge forming process at least once. According to claim 1,
A method of manufacturing a container, characterized in that repeating the bulge forming process a plurality of times. According to claim 2,
A method for manufacturing a container, characterized in that repeating the bulge forming process 2 to 10 times. According to any one of claims 1 to 3,
The step cup body is a container manufacturing method, characterized in that the angle of the stepped portion with respect to a plane perpendicular to the axial direction of the step cup body is 0 to 60 °. According to any one of claims 1 to 4,
A method for producing a container, characterized in that the diameter of the tapered part of the diameter expanding punch used in the preceding bulge forming step is different from the diameter of the tapered part of the diameter expanding punch used in the subsequent bulge forming step. According to any one of claims 1 to 5,
A shape in which the line connecting the outer circumferential surface at a height of 10% from the bottom and the outer circumferential surface at a height of 90% from the bottom of the body portion of the container extends outward at an angle of 2° to 15° when the total height of the container is 100%. to form,
A container manufacturing method characterized in that when the two containers are stacked, the protruding portion of the upper container is set to a height of 20 mm or less from the upper end of the lower container. According to claim 6,
The bottom part has a plate thickness of 0.20 mm to 0.35 mm,
The body part has a plate thickness of 0.10 to 0.22 mm in the range of 50 ± 10% of the height when the total height of the container is 100%,
The body portion is formed in a shape in which a line connecting an outer circumferential surface with a height of 10% from the bottom and an outer circumferential surface with a height of 90% from the bottom widens outward at an angle of 3 ° to 10 ° when the total height of the container is 100%. A method for manufacturing a container, characterized in that for doing. According to claim 6 or 7,
A method for manufacturing a container, characterized in that the ratio of the protrusion to the height of the container is 4% to 15%. According to claim 6 or 7,
A method for manufacturing a container, characterized in that the ratio of the protrusion to the height of the container is 5% to 9%. According to any one of claims 6 to 9,
A container manufacturing method characterized in that the body portion has a contact portion that prevents contact with other containers by reducing the number of contact points when stacked with other containers. An apparatus for manufacturing a metal container having a bottom portion and a body portion, the upper surface side being opened and the body portion extending outwardly as the upper surface side faces,
A step cup body made of metal having a lowermost cylindrical small-diameter cylindrical portion and a cylindrical large-diameter cylindrical portion with an upper end of the small-diameter cylindrical portion open through a stepped portion and an upper surface side being opened. A tapered mold portion having a smaller diameter than the inner diameter of the large-diameter cylindrical portion of the step cup body and a larger diameter than the inner diameter of the small-diameter cylindrical portion of the step cup body for expanding the diameter by acting from the opening side of the cylindrical portion of the diameter along the direction of the cylindrical axis. A container manufacturing apparatus characterized by having at least one bulge forming mold having a diameter-expanding punch. According to claim 11,
A container manufacturing apparatus characterized by having a plurality of said bulge forming molds. According to claim 12,
A container manufacturing apparatus characterized by having 2 to 10 of the bulge forming molds. According to any one of claims 11 to 13,
The step cup body has an angle of 0 to 60 degrees with respect to a plane perpendicular to the axial direction of the step cup body of the stepped portion. According to any one of claims 11 to 14,
Each of the bulge forming molds is a container manufacturing apparatus, characterized in that the diameter of the taper forming part of the diameter expansion punch is different from each other.

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