TW202218946A - Container manufacturing method and container manufacturing device - Google Patents

Abstract

The present invention addresses the problem of providing a container manufacturing method and a container manufacturing device with which a container having a trunk part that has a shape which widens outward going toward the upper surface side can be easily manufactured. This container (100) manufacturing method is a method for manufacturing a metal container which includes a bottom part (120) and a trunk part (110) and has an open upper surface side, and in which the trunk part has a shape which widens outward going toward the upper surface side, the method comprising an overhang molding step in which a metal step cup body (200), which has a small-diameter cylindrical part (260) having a bottomed cylindrical shape and a large-diameter cylindrical part (280) which has a cylindrical shape where the upper surface side opens and which continues to an upper end of the small-diameter cylindrical part via a step (270), is widened in diameter by causing a widened-diameter punch (300), which has a tapered pressing part (340) the diameter of which is smaller than the inner diameter of the large-diameter cylindrical part of the step cup body and larger than the inner diameter of the small-diameter cylindrical part, to act along a cylinder axis direction from the opening side of the large-diameter cylindrical part, wherein the overhang molding step is performed at least once.

Description

Manufacturing method of container and manufacturing apparatus of container

The present invention relates to a method for manufacturing a metal container, and a manufacturing apparatus for the container. The metal container has a bottom portion and a main body portion, and an upper surface side is open.

In recent years, in order to save resources, reduce waste, and the like, there is a need for a container that can replace paper, plastic, etc. containers, and is lightweight, inexpensive, and easily recyclable. A metal container with an upper surface opening used as a tableware or a container for filling beverages, foods, etc. is known (refer to Patent Document 1, etc.) and is available for use.

As a conventional container with an upper side opening, a metal container that can be used for tableware and the like after being washed is known for countless times. However, when long-term use is considered, it is necessary to improve durability, and to improve strength, a certain amount is required. If the thickness of the plate is too high, it will increase the cost of materials and forming costs, and the weight will also become heavier. Therefore, there are still many problems as a substitute for paper and plastic containers. In recent years, the recycling environment of metal can containers has also been completed. Therefore, by using metal containers with thin materials such as those disclosed in Patent Document 1, material costs, molding costs, and weight can be reduced, and they can be used only once as tableware. There is also the possibility of saving resources and reducing waste. However, there are problems in that the shape and structure are not suitable for the metal container itself open to the upper surface side, which is stored and transported in an empty state, and the user directly uses it in an open state. In addition, as the global awareness of preventing environmental pollution such as marine pollution caused by plastic increases, for example, there is a demand for a container made of a material that can be easily recycled and reused.

On the other hand, as disclosed in Patent Document 2, etc., in order to manufacture a metal container with an open top side, a technique of forming a main body portion into a tapered shape is required, but in the conventional manufacturing method of a beverage can, the Only a part of the height direction of the main body such as the neck or chime is formed into a tapered shape, and about 70 to 90% of the broad height range of the main body of the container is formed into a smooth tapered shape method has not yet been established. [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2003-128060 Patent Document 2: Japanese Patent Laid-Open No. 2006-224113

(The problem that the invention intends to solve)

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a container manufacturing method and a container manufacturing apparatus which can easily manufacture a container having a main body portion which expands outward toward the upper surface side. shape. (Technical means to solve problems)

The manufacturing method of the container of the present invention is a method of manufacturing a metal container having a bottom portion and a main body portion, and the upper surface side is open, and the main body portion has a shape that expands outward toward the upper surface side, The manufacturing method of the container includes a stretch forming step in which an expanding punch acts on a metal stepped cup body from the opening side of the large-diameter cylindrical portion in the direction of the cylindrical axis. To expand its diameter, the stepped cup system has a cylindrical portion with a bottomed cylindrical shape having a small diameter, and a cylindrical portion with a large diameter that is open on the top side. The shape portion is continuous with the upper end of the cylindrical portion with the small diameter through the stepped portion, and the diameter-expanding punch has a tapered die portion, which is a circle with a larger diameter than the above-mentioned stepped cup body. The inner diameter of the cylindrical portion is a small diameter and the inner diameter of the cylindrical portion with a smaller diameter is a larger diameter, and The above-mentioned problem can be solved by performing the above-mentioned stretch forming step at least once.

The container manufacturing apparatus of the present invention is an apparatus for manufacturing a metal container. The metal container has a bottom portion and a main body portion, and the upper surface side is open, and the main body portion has a shape that expands outward toward the upper surface side, It is characterized by: It has at least one stretch-forming die equipped with a diameter-expanding punch for acting on a metal attachment in the direction of the cylinder axis from the opening side of the large-diameter cylindrical portion. The stepped cup body is expanded in diameter, and the stepped cup system has a cylindrical portion with a bottomed cylindrical shape having a small diameter, and a cylindrical portion with a large diameter that is open on the top side. The large-diameter cylindrical portion is continuous with the upper end of the small-diameter cylindrical portion through the stepped portion, and the diameter-expanding punch has a tapered die portion, which is more compact than the above-mentioned stepped cup body. The inner diameter of the cylindrical portion of the large diameter is a small diameter and is larger than the inner diameter of the cylindrical portion of the small diameter. (Compared to the efficacy of the prior art)

According to the manufacturing method of the container of the first aspect of the present application and the manufacturing apparatus of the container of the eleventh aspect of the present application, by performing at least one stretching process for expanding the diameter of the bottomed cylindrical metal cup body with steps The forming step can expand the diameter of the cup body with steps without causing damage such as wrinkles and body breakage. Therefore, even in the case of forming the wide height range of the main body of the container into a tapered shape, it can be easily A container made of metal and easily recyclable, which has a body portion of a desired smooth tapered shape that expands toward the outer side toward the upper side, is produced. In addition, since it does not require a long stroke of the expanding punch, the miniaturization and high speed of the manufacturing equipment can be realized.

According to the manufacturing method of the container of the second aspect of the present application and the manufacturing apparatus of the container of the twelfth aspect of the present application, by repeating the stretching and forming steps a plurality of times, it is possible to reliably form the wide height range of the main body of the container into a cone. shape. By repeating the above-mentioned stretch forming step 2 to 10 times, it is possible to more reliably form the wide height range of the main body portion of the container into a tapered shape.

According to the manufacturing method of the container of the fourth aspect of the present application and the manufacturing apparatus of the container of the fourteenth aspect of the present application, the stepped portion of the cup with the steps is relative to the plane perpendicular to the axial direction of the cup with the steps ( When the angle of the horizontal plane is 0 to 60°, the generation of wrinkles and the like can be suppressed, and the wide height range of the main body of the container can be easily formed into a tapered shape. According to the container manufacturing method of the fifth aspect of the present application and the container manufacturing apparatus of the fifteenth aspect of the present application, by making the diameter of the tapered die portion of the expanding punch used in the preceding stretch forming step, and the subsequent The diameters of the tapered die portions of the expanding punches used in the stretch forming step are different from each other, so that a wide range of heights of the main body portion of the container can be surely formed into a tapered shape.

According to the manufacturing method of the container of the sixth aspect of the present application, the main body portion is formed so that the line connecting the outer peripheral surface of the lowermost 10% height and the outer peripheral surface of the 90% height with the full height of the container as 100% faces toward When the outside expansion angle (main body taper angle) is 2° to 15°, preferably 3° to 10°, it is possible to produce high strength, and to suppress overturning when the center of gravity for storing beverages and the like is raised, and it is easy to Containers in a shape that overlaps and is easy for users to hold. If the taper angle of the main body is formed to exceed 15°, the distance from the adjacent container increases when it is arranged in an upright state, so the storage efficiency will be deteriorated, and the taper angle of the main body is formed to be smaller than 2°. Then, when the overlapping containers are separated, the difficulty of separation is increased due to the occurrence of embedding or the like. In addition, according to the container manufactured in this way, when two containers are overlapped, by setting the protrusion of the upper container from the lower container to a height of 20 mm or less from the upper end of the lower container, the reduction can be reduced. Height when overlapping multiple containers. In addition, when the container is transported and transferred in the filling equipment of beverages, foods, etc., the installation equipment of lids, etc., it can be transported and transferred in the state of stacking the containers, and the filling of beverages, foods, etc., and then sealing the cans can be improved. Efficiency when making cans, etc.

According to the structure described in the seventh aspect of the present application, by making the plate thickness of the bottom part 0.20 mm or more, a container with a low center of gravity position and good self-supporting stability can be produced. In addition, by setting the plate thickness of the bottom to 0.35 mm or less, and setting the main body to a plate thickness of 0.10 to 0.22 mm within the height range of 50±10% when the full height of the container is taken as 100%, it is possible to obtain , can reduce material cost and molding cost, and is designed to be lightweight, and can be formed into a better shape, that is, when the full height of the container is taken as 100%, it is connected from the outer peripheral surface of the lowermost 10% of the height to 90% of the height A shape in which the line of the outer peripheral surface expands outward at an angle of 3° to 10°, such a container. According to the configuration described in the eighth aspect of the present application, by setting the ratio of the protruding portion to the height of the container to be 4% to 15%, it is possible to manufacture, and it is possible to prevent the occurrence of entrapment when a plurality of containers are overlapped, and to ensure easy separation. It can reduce the volume and improve the efficiency of storage and transportation in the state of empty cans, such as containers. It is more preferable that the ratio of the height of the protrusion to the container is 5% to 9%. According to the configuration described in the tenth aspect of the present application, the main body portion is provided with the contact portion, which can prevent the contact portion from being closely contacted with the other container by reducing the contact portion when it overlaps with the other container. It can surely prevent the situation that the body parts are in close contact with each other when a plurality of containers are overlapped, and when a plurality of overlapping containers are separated, they are all non-contact except the contact part, which can make the air circulation between the containers good, and further improve the Ease of separation, such a container.

Hereinafter, the container manufactured by the manufacturing method of the container of this invention is demonstrated. As shown in FIG. 1, the container manufactured by the manufacturing method of the container of the present invention is a container 100 having a shape that can replace the well-known paper cups and plastic cups. The container 100 is made of metal and has a bottom 120 and a main body 110. And it has an upper opening 101 whose upper surface side is opened. The body portion 110 of the container 100 has a tapered portion 111 of an inverted truncated cone shape (tapered shape) that expands outward as it goes upward (the side of the upper opening 101 ), and is continuous from the tapered portion 111 to the upper portion of the upper opening 101 The side portion 113 and the lower side portion 114 of the bottom portion 120 are continuous from the tapered portion 111 . In cross-section, the tapered portion 111 of the body portion 110 is, for example, a tapered shape similar to a straight line, and its angle θ is 5°. In addition, the upper side part 113 and the lower side part 114 do not expand to the outside, but have a substantially cylindrical shape. For example, when the full height of the container is taken as 100%, and the container 100 is placed on a horizontal plane with the bottom 120 in a downward position, the tapered portion 111 of the container 100 is 10° from the horizontal plane with a uniform outward expansion angle. The height of % is formed to the height of 90%. Therefore, when the full height of the container is taken as 100%, the line connecting the outer peripheral surface of the 10% height and the outer peripheral surface of the 90% height from the bottom is facing the outside. The spread angle (main body taper angle) is approximately 5°, which is approximately the same as θ. In the present embodiment, the bottom portion 120 is formed in the same shape as a well-known two-piece beverage can. In addition, in order to be used as a cup, the peripheral edge of the upper opening 101, that is, the upper end of the main body 110, is shaped such that the sharp end face does not directly contact the mouth, such as a curled shape.

Hereinafter, one embodiment (1st Embodiment) of the manufacturing method of the container of this invention is demonstrated. The manufacture of the container 100 includes a step of forming a cup body with steps and a stretch-expand forming step. The step of forming a cup body with steps is to form a metal plate (blank) into a bottomed and The stepped cup body 200 is obtained by having two cylindrical portions with a large diameter and a small diameter in a stepped shape, and the stretching forming step is performed by expanding the diameter toward the opening end 201 side. The small-diameter cylindrical portion of the obtained stepped cup body 200 is stretched to form a tapered portion 111 that expands toward the outside toward the upper opening 101 side. After the stretch forming step, a crimp forming step is performed, and the crimp forming step is to perform crimp forming on the upper end of the main body portion 110 to round the corners. In addition, the crimp-forming step may be performed before the stretch-forming step, or in the middle of a plurality of stretch-forming steps.

As shown in FIG. 2A , the stepped cup 200 has two cylindrical portions 260 and 280 with a small diameter and a large diameter which are continuous by the stepped portion 270 . The small-diameter cylindrical portion 260 has a bottomed cylindrical shape, and the large-diameter cylindrical portion 280 is continuous with the upper end of the small-diameter cylindrical portion 260 via the stepped portion 270 and is opened on the upper surface side. shape. The inner diameter of the small-diameter cylindrical portion 260 is set equal to the minimum inner diameter of the desired tapered portion 111 of the main body portion 110 of the container 100 . In addition, the inner diameter of the large-diameter cylindrical portion 280 is set to be equal to the maximum inner diameter of the desired tapered portion 111 of the main body portion 110 of the container 100 . The heights in the direction of the cylindrical axis X of the small-diameter cylindrical portion 260 and the large-diameter cylindrical portion 280 may be the same or different from each other. The stepped portion 270 is provided along the entire circumference of the stepped cup body 200 , and has a horizontal stepped portion surface 271 having an angle of approximately 0° with respect to the direction perpendicular to the cylinder axis X, that is, a horizontal stepped portion surface 271 . In addition, the cup body with the step may also have an inclined surface, and the inclined surface is an inclined surface whose angle α of the stepped surface relative to the horizontal plane perpendicular to the direction perpendicular to the cylinder axis X is greater than 0° and less than 60°. Specifically, as shown in FIG. 2B with a stepped cup body 400, it has three cylindrical portions 440, 460, 480 with a small diameter, a middle diameter and a large diameter, which are separated in the height direction by the The two stepped portions 450 and 470 are respectively connected. The cylindrical portion 440 of the smallest diameter is a bottomed cylindrical portion, the cylindrical portion 460 of the middle diameter is continuous with the upper end of the cylindrical portion 440 of the small diameter through the stepped portion 450, and the cylindrical portion of the large diameter is The shape part 480 is continuous with the upper end of the cylindrical part 460 of the middle diameter via the step part 470, and is set as the shape which the upper surface side opened. In addition, the stepped portion surfaces 451 and 471 of the two stepped portions 450 and 470 are respectively inclined surfaces inclined at an angle α in a state of going downward toward the radially inner side of the cylindrical axis X direction. The inner diameter of the small-diameter cylindrical portion 440 is set to be equal to the minimum inner diameter of the desired tapered portion 111 of the main body portion 110 of the container 100 . In addition, the inner diameter of the large-diameter cylindrical portion 480 is set to be equal to the maximum inner diameter of the desired tapered portion 111 of the main body portion 110 of the container 100 . The number of the stepped portions 270 (the stepped portions 450 and 470 ) of the stepped cup body 200 may be one as shown in FIG. 2A , or two or more as shown in FIG. 2B . In addition, the height position at which the stepped portion 270 (the stepped portions 450 and 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 stretch forming step is performed at least once, and may be repeated several times. In the case of repeating the stretching forming step, the number of repetitions of the stretching forming step varies according to the desired size of the container 100, the taper angle of the body portion, or the thickness of the plate for forming the stepped cup body 200. It is preferably 2 to 10 times, more preferably 2 to 5 times, still more preferably 2 to 4 times, and particularly preferably 3 times. When the number of repetitions of the stretch forming step is too large, the increase in the number of steps may result in an increase in the manufacturing load and manufacturing cost, or the influence of the forming heat may be large, resulting in a non-negligible error in the size of the finished product, resulting in a decrease in the yield. And the production efficiency is likely to decrease. On the other hand, when the number of repetitions of the stretch forming step is too small, in the case of manufacturing the container 100 having a large size or a large taper angle of the main body, there may be a possibility that the stretch ratio in the stretching forming step is set larger once. , and the main body portion 110 may be damaged such as breakage.

In the stretch forming step, a manufacturing apparatus equipped with a forming die is used. The forming die has an expanding punch 300 and an outer die tool (not shown). The expanding punch 300 has a cylindrical shape with a smaller diameter. The inner diameter of the portion 260 is a large-diameter tapered die portion 340, and the outer die tool has an outer periphery of the tapered die portion 340 of the expanding punch 300 across the peripheral side wall 261 of the small-diameter cylindrical portion 260 and the diameter-expanding punch 300. The shape of the inner peripheral surface suitable for the surface (tapered surface 341 ). The diameter-expanding punch 300 has, for example, a straight cylindrical cylindrical portion 350 that is continuous with the upper portion of the tapered die portion 340 . The outer peripheral surface of the tapered die portion 340 is formed as a tapered surface 341 having the same taper angle over the entire circumference of the working surface serving as diameter expansion. The taper angle of the tapered surface 341 is set to an angle suitable for the taper angle of the body portion of the desired taper portion 111 of the container 100, and is 5 degrees in this embodiment. The tapered surface 341 may also be a convex curved surface shape or a concave curved surface shape formed so as to suit the taper angle of the body portion of the tapered portion 111 of the desired container 100 . The diameter-expanding punch 300 is set so that the inner diameter of the cylindrical portion 280 having the larger diameter at the largest outer diameter portion is the smaller diameter. Specifically, the diameter-expanding punch 300 has such a degree that it can be gently inserted into the large-diameter cylindrical portion 280 , that is, between the inner peripheral surface of the large-diameter cylindrical portion 280 and the cylindrical portion of the diameter-expanding punch 300 350 is an outer contour shape with a slight gap between the outer peripheral surfaces. The diameter-expanding punch 300 is provided so as to be capable of reciprocating movement at a predetermined stroke length by a drive mechanism (not shown).

In the container manufacturing apparatus of the present invention, there are a plurality of stretch-expand forming dies formed by expanding punches 300, and the expanding punches 300 have tapered shapes with different outer diameters. Die part 340 . In addition, in each stretch forming step of the container manufacturing method of the first embodiment, the diameter-expanding punch 300 having the tapered die portions 340 having different outer diameters is used. If the maximum outer diameter of the tapered die portion 340 of the diameter expanding punch 300 used in the 1st, 2nd, ..., and nth stretch forming steps is set as d1, d2, ..., dn, respectively, Then d1>d2>...>dn. In addition, the taper angle of the taper surface 341 of the taper die portion 340 of the diameter-expanding punch 300 used in each stretch forming step can be set to be approximately the same, for example. In addition, the minimum outer diameter of the tapered die portion 340 of the expanding punch 300 used in the (n-1)th stretch forming step is set to be smaller than that of the n-th stretch forming step that follows. The maximum outer diameter of the tapered die portion 340 of the diameter-expanding punch 300 used is the small diameter. In addition, the length of the tapered die portion 340 (the axial length of the tapered die portion 340 ) of the expanding punch 300 used in each stretch forming step is set to be approximately the same, and the specific length is as desired. The height of the tapered portion 111 in the body portion 110 of the container 100 is determined by the number of repetitions of the stretch forming step. Furthermore, in each expanding punch 300, the taper angle or axial length of the tapered surface 341 of the tapered die portion 340 is not limited to be substantially the same, as long as it fits the desired specific cup of the container 100. The shape can be set to the size of the appropriate shape, respectively. For example, the tapered surface 341 may be formed into a curved surface. In addition, the minimum outer diameter and the maximum outer diameter of the tapered die portion 340 of each expanding punch 300 may be set to appropriate sizes according to the specific cup shape of the desired container 100 .

In the stretch forming step of the container manufacturing method of the first embodiment, as shown in FIG. 3A , first, the cup body 200 with the steps is placed on the pedestal with the opening end 201 side facing the pedestal 370 side. 370, and the expanding punch 300 is coaxially placed on the side of the opening end 201 of the stepped cup body 200 with the tapered surface 341 in a posture where the hem shrinks (inverted truncated cone shape). Next, in a state where an external mold tool (not shown) is disposed outside the stepped cup body 200, as shown in FIG. 3B, the expanding punch 300 is moved from the open end 201 of the stepped cup body 200 The sides are moved relatively in the direction of the cylinder axis X (moved downward in FIG. 3B ) to the desired position. When the diameter-expanding punch 300 is moved, the tapered surface 341 of the tapered die portion 340 comes into contact with the corner portion 272 of the stepped portion 270, and the stepped portion 270 and a part of the peripheral side wall 261 are expanded into an inverted truncated cone shape, and The step portion 270 is gradually disappeared. Then, the movement of the expanding punch 300 is stopped at the time point when the upper end of the tapered die portion 340 of the expanding punch 300 moves to the level position that should be the upper end of the tapered portion 111 , as shown in FIG. 3C . A new curved portion 262 is formed at the position corresponding to the lower end of the moving tapered die portion 340 on the cylindrical portion 260 of the small diameter, and the tapered surface 341 and the outer surface of the tapered die portion 340 of the expanding punch 300 are formed. The conical cylindrical portion 251 of the conical shape corresponding to the die tool. In addition, on the side of the opening end 201 of the stepped cup body 200 , the portion where the cylindrical portion 350 of the expanding punch 300 abuts, or the portion where the expanding punch 300 does not contact, becomes the upper side portion of the container 100 113. In the subsequent stretch forming step, the same action is performed using a diameter expanding punch having a tapered die portion with a smaller diameter, and the bending portion 262 formed in the preceding stretching forming step is pushed and expanded to be different from that in the previous stretch forming step. A new tapered cylindrical portion is formed in a state in which the bottom portion 220 side of the tapered cylindrical portion 251 formed in the preceding stretch forming step is overlapped or abutted with each other and is smoothly continuous with each other in a tapered shape. In the final stretch forming step, the expanding punch 300 cannot move any more, and the lower portion of the cylindrical portion 260 with the small diameter of the cup body 200 with the steps remaining becomes the lower side portion 114 of the container 100 . By repeating the above-mentioned stretching and forming steps, a plurality of tapered cylindrical portions 251 are smoothly continued to form the tapered portion 111, whereby a container 100 having a main body portion 110 having a uniform outward expansion can be obtained. The tapered portion 111 of the tapered shape formed by the angle.

Although the elongation ratio formed by the stretching forming step can be different according to the taper angle of the main body portion of the tapered portion 111 of the container 100 to be manufactured, it is relatively high at the height position corresponding to the uppermost portion of the tapered portion 111 . Preferably, it is 2 to 15%, more preferably 3 to 7%, and in this embodiment, it is 5%. In addition, the height position corresponding to the directly below the stepped portion 270 of the stepped cup body 200 (the uppermost portion of the small-diameter cylindrical portion 260) is preferably 1-10%, more preferably 2-5 %, in this embodiment, it is 3%. When the diameter of the uppermost height position of the tapered portion 111 of the cup body 200 (plain can) with steps before the first stretching step is set as L1, and the last (nth) stretching When the diameter of the uppermost portion of the tapered portion 111 of the container 100 after the stretching step (the maximum diameter of the tapered portion 111 ) is set to A1, the elongation ratio at the height position corresponding to the uppermost portion of the tapered portion 111 is expressed as (1) to represent: tensile ratio = (A1-L1)/L1×100(%). In addition, let the diameter of the uppermost part of the cylindrical portion 260 of the small diameter of the stepped cup body 200 (plain can) before the first stretch forming step be L2, and the last (nth) When the diameter of the uppermost height position of the small-diameter cylindrical portion 260 of the container 100 after the stretching and forming step is set as A2, the difference between the height position corresponding to the height position directly below the stepped portion 270 of the stepped cup body 200 is set as A2. The elongation ratio is represented by the formula (2): elongation ratio=(A2-L2)/L2×100(%). The elongation ratio formed by the stretching forming step is preferably in the range of 2-7% at any height position of the cup body 200 with the steps. The smaller the elongation ratio, the smaller the degree of plastic deformation, so that the tapered portion 111 having a desired tapered shape without damage can be obtained. When the elongation ratio is too large, the metal material may not be able to follow the plastic deformation caused by processing, and there is a possibility that the tapered portion 111 of the container 100 may be broken.

As a sheet material, it can be used as a sheet material of an aluminum alloy with a thickness of 0.20 mm to 0.35 mm, which is formed by laminating a PET film of about 0.01 mm on both sides, like a well-known two-piece beverage can made of aluminum alloy. By using such a plate, when it is formed into a container, the bottom of the plate thickness of the material can be approximately maintained to be 0.20mm~0.35mm, and the height of the container is 50±10% when the full height of the container is taken as 100%. The body portion 110 in the range has a thickness of 0.10 to 0.22 mm.

When the container 100 of the present invention is overlapped, as shown in FIG. 4 and FIG. 5, (1) The outer upper end of the tapered portion 111 of the upper container 100 and the vicinity of the inner upper end of the upper side portion 113 of the lower container 100u, and (2) The lower end of the outer surface of the lower side portion 114 of the upper container 100 and the vicinity of the lower end of the inner surface of the tapered portion 111 of the lower container 100u, At least one of them is in contact and overlapping, and there is no situation in which the outer surface of the tapered portion 111 of the upper container 100 is in close contact with the inner surface of the tapered portion 111 of the lower container 100u.

The upper end of the upper container 100 has a protrusion 112 protruding from the upper end of the lower container 100u. The protrusion height T of the protrusion 112 is determined by the height of the upper side 113, the height of the lower side 114, and the shape of the bottom 120. In the example of FIG. 4 , the protruding height T is 8.0 mm, and the ratio of the height T of the protruding portion to the height H of the container 100 is 7.1%. Furthermore, the upper side portion 113 and the lower side portion 114 may be formed so as to expand outward at an angle different from that of the tapered portion 111 , only one of them may be provided, or neither of the two may be provided. In addition, the upper side portion 113 and the lower side portion 114 may be formed in a tapered shape opposite to the tapered portion 111 so as to be narrowed inward.

When the upper side portion 113 and the lower side portion 114 do not exist, or are extremely small, and the outer surface of the bottom 120 of the upper container 100 and the inner surface of the bottom 120 of the lower container 100u can be in close contact with each other when they overlap, by setting An independent contact portion that protrudes toward the inner surface side of the main body portion 110 and contacts the outer surface of the container overlapped above, namely a bead, prevents the outer surface of the main body portion 110 of the upper container 100 from being connected to the main body portion 110 of the lower container 100u. The inner surface is closely connected with the surface, and this is also possible. The shape, direction, number, and position of the beads may be arbitrary, and may protrude toward the inner side, may be projected toward the outer side, or may be mixed inside and outside. In addition, as long as it can function as a contact part, the protrusion part which protrudes from the tapered part 111 with a point or a surface may not be a bead shape.

Moreover, after filling the container 100 with a drink etc., it can also be used as a can to which a lid member is attached. As the lid member, any configuration such as a metal stay-on-tab easy-to-open can pull-tab lid, a sheet formed of a laminate, and a screw lid may be used. When the lid member is crimped on the upper end of the main body as a stop-type easy-open can pull-tab lid, the upper end of the main body of the container shall be flanged to form a surface portion as long as it is trimmed for crimping. status can be. In order to secure the bonding area, the upper end of the main body of the container may have a planar shape when the lid member is bonded to the upper end of the main body by heat or the like. The sheet formed from the laminate includes, for example, aluminum foil, paper, resin film, or a laminate of two or more of these, and a thermal bonding layer (heat seal layer) may be further laminated. As the thermal bonding layer, a layer formed of an adhesive such as a known sealing film, a paint-type adhesive, an easily peelable adhesive, and a hot-melt adhesive can be used. In the case where the lid member is screwed to the upper end of the main body as a screw cap, the protruding portion 112 such as the upper side portion 113 of the upper end of the main body portion of the container can also be configured with a spiral strip. In order to screw the screw cap, it is also possible to In addition, a lid member with a spout provided with a spiral strip is crimped on the upper end of the main body of the container. By matching the protruding portion 112 with the installation form of the cover member, no matter what kind of article the cover member is, the efficiency of storing and transporting the container portion can be improved.

As mentioned above, although the manufacturing method of the container and the manufacturing apparatus of the container according to the first embodiment of the present invention have been described in detail, the present invention is not limited to the above-mentioned embodiment, as long as the essence of the present invention is described in the scope of the patent application. Various changes can be made within the scope of the content. For example, in the manufacturing method of the container of the present invention, the tapered portion of the main body portion is not limited to be formed so as to expand outward at an angle of 2° to 15° in which the taper angle of the main body portion is in any position. The container of the shape can also be manufactured, which is partially the same as the upper side part and the lower side part of the present embodiment, and there is a part of the container outside the range of 2 ° ~ 15 °. A container with a curved shape whose angle gradually changes, a container with a plurality of stepped portions formed on the body portion, etc., a container with a body portion that combines linear expansion, curved expansion, and stepped portions.

In addition, for example, it is not limited to dividing the body portion 110 in the height direction as in the first embodiment and forming in each stretch forming step, but it is also possible to divide the desired final body portion taper angle and form it in each sheet. In the stretching step, the body portion 110 is formed in a manner of gradually expanding laterally. Hereinafter, the manufacturing method of the container of 2nd Embodiment is demonstrated. In each stretching and forming step of the container manufacturing method of the second embodiment, an expanding punch having a tapered die portion having an inverted truncated cone shape having the same size as the desired container 100 is used. The tapered portions 111 of the body portion 110 have the same height and length (the axial length of the tapered die portion), tapered surfaces with different taper angles, and different outer diameters. If the taper angles of the expanding punches used in the 1st, 2nd, ..., and nth stretch forming steps are set to θ1, θ2, ..., θn, respectively, θ1<θ2<... < θn. In addition, assume that the maximum outer diameter of the tapered die portion of the expanding punch used in the first, second, ..., and nth stretch forming steps is set to d1, d2, ..., dn, respectively. , then d1<d2<...<dn. The taper angle θ(n-1) of the diameter-expanding punch used in the (n-1)th stretch forming step, and the taper angle θ(n-1) used in the n-th subsequent stretch forming step. The angle difference of the taper angle θn of the diameter-expanding punch is, for example, about 2.5°. In the container manufacturing method of the second embodiment, the taper angle of the diameter-expanding punch used in the first stretch forming step is 2.5°, and in the second (final) stretch forming step, the taper angle is 2.5°. The taper angle of the expanding punch used was 5°.

As shown in FIG. 6A , in the stretching forming step of the container manufacturing method of the second embodiment, first, the stepped cup body 500 is placed on the pedestal with the opening end 501 side facing the pedestal 370 side. (not shown), and coaxially place an expanding punch (not shown) on the opening end of the stepped cup body 500 in a posture where the tapered surface becomes the hem contracted (inverted truncated cone shape) 501 side, wherein, the stepped cup body 500 has a stepped portion 570 , and the stepped portion 570 has an inclined stepped portion surface 571 . Next, in a state where an external mold tool (not shown) is arranged outside the stepped cup 500, the expanding punch is moved along the cylindrical axis X from the side of the opening end 501 of the stepped cup 500. The direction of the relative movement (moving downward in FIG. 6A ), the expansion stops at the time point when it moves to the level position at which the surface of the tapered portion 111 is fully expanded by the tapered surface of the expanding punch. Movement of the radial punch. When the expanding punch is moved, as shown in FIG. 6B , the tapered surface of the tapered die portion of the expanding punch starts to come into contact with the corner portion 573 on the inner peripheral side of the stepped portion 570 , and as the expanding punch moves A part of the corners 573 on the inner peripheral side of the stepped portion 570 is moved to expand the diameter to disappear, and a new stepped portion 590 is formed by the remaining corners 593. The taper angle (taper angle θ1 ) is expanded into an inverted truncated cone shape to form the tapered cylindrical portion 551 . In the subsequent stretch forming step, use the expanding punch of the tapered die portion with a larger taper angle (taper angle θ2) to perform the same action. As shown in FIG. 6C, the preceding stretch forming step will be used. A part of the corner portion 593 remaining in the middle step portion 590 is enlarged in diameter to make it disappear, and the diameter of the tapered cylindrical portion 551 formed in the preceding stretching forming step is further enlarged, according to the tapered diameter of the diameter-enlarging punch used. The taper angle (taper angle θ2 ) of the face forms a new tapered cylindrical portion 552 (body portion 110 ) having a larger taper angle (taper angle θ2 ). By repeating the above-mentioned stretching and forming steps until the stepped portion disappears, the body portion 110 is gradually expanded in diameter and laterally expanded into a tapered portion 111 , thereby obtaining the container 100 having the body portion 110 . 110 has a tapered portion 111 of a tapered shape formed with a uniform expansion angle toward the outside.

100, 100u: container 101: Upper opening 110: body part 111: Tapered part 112: Protrusion 113: upper side 114: Lower side 120: Bottom 200: Cup with Ladder 201: Open End 220: Bottom 251: Conical barrel 260: Cylindrical part of small diameter 261: Peripheral Sidewall 262: Bending part 270: Step Department 271: Step Facial 272: Corner 280: Large diameter cylindrical part 300: Expanding punch 340: Conical die section 341: Conical face 342: Lower end face 350: barrel 370: Pedestal 400: Cup with Ladder 440: Cylindrical part of small diameter 450: Steps 451: Step Facial 460: The cylindrical part of the middle diameter 470: Steps 471: Step Facial 480: Large diameter cylindrical part 500: Cup with Ladder 501: Open end 551, 552: Conical barrel 570, 590: Steps 571: Step Facial 573, 593: Corner α: angle θ: Angle of taper A1: Diameter A2: Diameter H: the height of the container L1: Diameter L2: Diameter T: Projection height X: Cylinder shaft

Fig. 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 the cup with steps used in the method of manufacturing the container of the present invention. FIG. 2B is a side view of another cup body with steps used in the manufacturing method of the container of the present invention. Fig. 3A is a schematic diagram for explaining a method of manufacturing a container according to an embodiment of the present invention. FIG. 3B is a schematic diagram for explaining a method of manufacturing the container of one embodiment of FIG. 3A . Fig. 3C is a schematic diagram for explaining a method of manufacturing the container of the embodiment of Fig. 3A. Fig. 4 is a side view overlapping the container of Fig. 1 . FIG. 5 is an enlarged partial cross-sectional view of the overlapping container of FIG. 4 . FIG. 6A is a schematic diagram for explaining a method of manufacturing a container according to another embodiment of the present invention. FIG. 6B is a schematic diagram for explaining the manufacturing method of the container of the other embodiment of FIG. 6A. FIG. 6C is a schematic diagram for explaining the manufacturing method of the container of the other embodiment of FIG. 6A.

220: Bottom

260: Cylindrical part of small diameter

280: Large diameter cylindrical part

300: Expanding punch

341: Conical face

342: Lower end face

370: Pedestal

X: Cylinder shaft

Claims (15)

A method of manufacturing a container, which is a method of manufacturing a metal container, the metal container having a bottom and a body portion, and an upper surface side is open, and the body portion has a shape that expands outward toward the upper surface side; the The manufacturing method of the container is characterized by: It includes a stretching forming step in which a diameter-expanding punch acts on a metal stepped cup body from the opening side of the large-diameter cylindrical portion in the direction of the cylinder axis to expand the diameter. , the cup system with steps has a cylindrical portion with a bottomed cylindrical small diameter, and a cylindrical portion with a large diameter opened on the top side, and the large diameter cylindrical portion is connected by The stepped portion is continuous with the upper end of the small-diameter cylindrical portion, and the diameter-expanding punch has a tapered die portion, which is larger than the large-diameter cylindrical portion of the stepped cup body. The inner diameter is the smaller diameter and the inner diameter of the cylindrical portion with the smaller diameter is larger than the inner diameter, and The above-mentioned stretch forming step is performed at least once. The method for producing a container according to claim 1, wherein the above-mentioned stretch forming step is repeated a plurality of times. The method for manufacturing a container according to claim 2, wherein the above-mentioned stretch forming step is repeated 2 to 10 times. The manufacturing method of the container according to claim 1 or 2, wherein the angle of the stepped portion of the stepped cup with respect to a plane perpendicular to the axial direction of the stepped cup is 0 to 60°. The method for manufacturing a container according to claim 1 or 2, wherein the diameter of the tapered die portion of the diameter-expanding punch used in the preceding stretch-forming step and the diameter of the diameter-expanding punch used in the subsequent stretch-forming step The diameters of the tapered die portions of the heads are different from each other. The method for producing a container according to claim 1 or 2, wherein the body portion of the container is formed so as to connect the outer peripheral surface of 10% of the height from the lowermost portion and 90% of the height when the overall height of the container is 100%. The line on the outer peripheral surface of , is a shape that expands outward at an angle of 2° to 15°, When two of the above-mentioned containers are stacked, the protrusion from which the upper container protrudes is set to have a height of 20 mm or less from the upper end of the lower container. The method for manufacturing a container according to claim 6, wherein the bottom portion is set to have a plate thickness of 0.20 mm to 0.35 mm, In the case where the full height of the container is set to 100%, in the height range of 50±10%, the above-mentioned body portion is set to a plate thickness of 0.10 to 0.22 mm, and When the full height of the container is set to 100%, the line connecting the outer peripheral surface of 10% of the height from the lowermost part and the outer peripheral surface of 90% of the height of the main body part forms an angle of 3° to 10° and expands outward. shape. The manufacturing method of the container of Claim 6 whose ratio of the height of the said protrusion with respect to the said container is set to 4% to 15%. The manufacturing method of the container of Claim 6 whose ratio of the height of the said protrusion with respect to the said container is set to 5% to 9%. The method for producing a container according to claim 6, wherein the main body portion is provided with a contact portion that prevents close contact with other containers by reducing mutual contact portions when overlapping with other containers. A device for manufacturing a container, which is a device for manufacturing a metal container, the metal container has a bottom and a main body, and the upper surface is open, and the main body has a shape that expands outward toward the upper surface; It is characterized by: It has at least one stretch-forming die equipped with a diameter-expanding punch for acting on a metal attachment in the direction of the cylinder axis from the opening side of the large-diameter cylindrical portion. The stepped cup body is enlarged in diameter, and the stepped cup system has a cylindrical portion with a small diameter having a bottomed cylindrical shape, and a cylindrical portion with a large diameter and a cylindrical portion with an open top side, The large-diameter cylindrical portion is continuous with the upper end of the small-diameter cylindrical portion through a stepped portion, and the diameter-expanding punch has a tapered die portion, which is compared with the above-mentioned stepped cup body. The inner diameter of the above-mentioned large-diameter cylindrical portion is a small diameter and is larger than the inner diameter of the above-mentioned small-diameter cylindrical portion. The manufacturing apparatus of the container of Claim 11 which has a plurality of said stretch forming dies. The manufacturing apparatus for a container according to claim 12, wherein there are 2 to 10 above-mentioned stretch forming dies. The apparatus for manufacturing a container according to claim 11 or 12, wherein the angle of the stepped portion of the stepped cup with respect to a plane perpendicular to the axial direction of the stepped cup is 0 to 60°. An apparatus for manufacturing a container according to claim 11 or 12, wherein the diameters of the tapered die portions of the expanding punches in each of the above-mentioned stretch forming dies are different from each other.

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