CN110997174B

CN110997174B - Can manufacturing method, can manufacturing device, can, and can manufacturing tool set

Info

Publication number: CN110997174B
Application number: CN201880049783.9A
Authority: CN
Inventors: 真仁田清澄; 青柳光彦
Original assignee: Toyo Seikan Co Ltd
Current assignee: Toyo Seikan Co Ltd
Priority date: 2017-07-31
Filing date: 2018-07-31
Publication date: 2021-12-14
Anticipated expiration: 2038-07-31
Also published as: EP4035792A2; EP4035792A3; CN110997174A; WO2019026898A1; CN114194556A; CN114194556B; ES2951558T3

Abstract

The invention relates to a can manufacturing method, a can manufacturing apparatus, a can, and a can manufacturing tool kit. At least one of a concave portion and a convex portion is formed on a shoulder portion (3) of a tank (1) provided with a mouth portion (4), the shoulder portion (3) and a main body portion (2) by rotational processing using a nip between a receiving portion (11a) of an inner roller (11) having the concave and convex portions and an outer roller (12) having the concave and convex portions corresponding to the concave and convex portions of the receiving portion (11a) of the inner roller (11), thereby suppressing damage to the shoulder portion (3) of the tank (1) and decorating the shoulder portion (3) of the tank (1).

Description

Can manufacturing method, can manufacturing device, can, and can manufacturing tool set

Technical Field

The present invention relates to a can decorated on a shoulder portion, a can manufacturing method, a can manufacturing apparatus, and a can manufacturing tool kit.

Background

Conventionally, cans have a form having a thick shoulder portion, which is reduced in diameter from a thin cylindrical body portion, and a mouth portion, and the mouth portion is sealed by double seaming of a can lid or seaming by a metal cap.

As the decoration of the can body portion, there is a decoration in which printing is performed or embossing is performed as in patent document 1. On the other hand, as the decoration of the can shoulder portion, there is a decoration in which printing is performed as in patent document 2, or a decoration in which an uneven pattern is performed on the shoulder portion as in patent documents 3 to 5.

In recent years, when a concave-convex pattern is formed on a shoulder portion of a thin-walled can along with the reduction of the thickness of the can for resource saving, buckling of the shoulder portion occurs when a shoulder portion forming mold such as cited reference 3 (reference numeral 60 in fig. 7) or cited reference 4 (reference numeral 10 in fig. 1) is pressed against the shoulder portion of the can. In addition, when a forming die such as a groove forming tool of cited document 3 (reference numeral 72 in fig. 8) is pressed from only the outside of the can shoulder to form an uneven pattern, abnormal deformation of the thinned can shoulder is also caused.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2003-340539

Patent document 2: japanese laid-open patent publication No. 2004-168346

Patent document 3: japanese patent laid-open publication No. 2004-123231

Patent document 4: U.S. patent application publication No. 2015/0360279

Patent document 5: chinese patent application laid-open No. 103803145

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a can manufacturing method, a can manufacturing apparatus, a can, and a can manufacturing tool kit, which can suppress damage to a shoulder portion of the can.

Means for solving the problems

The can manufacturing method of the present invention is a method of manufacturing a can including a mouth portion, a shoulder portion, and a body portion, wherein the inner roller and the outer roller are rotated relative to the can in a state where a receiving portion of the inner roller and the outer roller sandwich the shoulder portion from inside and outside, the receiving portion provided in the inner roller receives the shoulder portion from inside and has at least one of a concave portion and a convex portion, and the outer roller presses the shoulder portion from outside and has at least one of a concave portion and a convex portion corresponding to the receiving portion of the inner roller.

The can of the present invention includes a mouth portion, a shoulder portion, and a body portion, wherein the shoulder portion includes at least one of a concave portion and a convex portion, an inner diameter of the mouth portion is 25 to 60mm, and a maximum outer diameter of the shoulder portion is 50 to 70 mm.

The can of the present invention includes a mouth portion, a shoulder portion, and a body portion, wherein the shoulder portion includes at least one of a concave portion and a convex portion, and a ratio of a maximum outer diameter of the shoulder portion to an inner diameter of the mouth portion is 1.05 to 1.58.

Further, a can manufacturing tool set according to the present invention is a can manufacturing tool set for manufacturing a can having a mouth portion, a shoulder portion, and a body portion, the can manufacturing tool set including: an inner roller having a receiving portion that receives the shoulder portion from inside and has at least one of a concave portion and a convex portion; and an outer roller that presses the shoulder portion from outside and includes at least one of a concave portion and a convex portion corresponding to the receiving portion of the inner roller, wherein the receiving portion of the inner roller and the outer roller rotate relative to the tank while sandwiching the shoulder portion from inside and outside.

Effects of the invention

According to the can manufacturing method, the can manufacturing apparatus, and the can tool kit of the present invention, since the shoulder portion of the can is pressed and held by the outer roller to be rotated in a state where the shoulder portion of the can is supported from the can inner side by the receiving portion of the inner roller, abnormal deformation is less likely to occur even if the shoulder portion of the can is thin.

Further, according to the can of the present invention, since the maximum outer diameter of the shoulder portion is not excessively large relative to the inner diameter of the mouth portion of the can and the shoulder portion width of the can is sufficiently wide, the inner roller can be inserted from the mouth portion of the can suitable for the rotational processing of the shoulder portion, and the shoulder portion of the can be firmly supported by the receiving portion of the inner roller, so that the shoulder portion of the can is not easily deformed abnormally by the processing.

Drawings

Fig. 1 is a schematic view of a partial cross section of a tank according to the present invention including a first embodiment.

Fig. 2 is a diagram showing an example of a three-dimensional forming portion of a shoulder portion of a can according to the first embodiment.

Fig. 3 is a schematic diagram illustrating a three-dimensional forming section processing apparatus according to the first embodiment, using a partial cross section including a tank.

Fig. 4 is a diagram showing an example of the inner roller and the outer roller of the three-dimensional forming section processing device in the can manufacturing method according to the first embodiment.

Fig. 5 is a schematic diagram of a partial cross section including a can to explain a method of manufacturing the can according to the first embodiment.

Fig. 6 is a schematic view showing an example of the inner roller and the outer roller according to the second embodiment, which is a partial cross section including a tank.

Fig. 7 is a schematic view showing an example of the inner roller and the outer roller according to the second embodiment, which is illustrated using a partial cross section including a tank.

Fig. 8 is a sectional view of an upper portion of the can of the embodiment and is a diagram schematically showing the inner roller.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[ first embodiment ]

First, the tank 1 according to the first embodiment will be described with reference to fig. 1 and 2.

The can 1 is formed of a known metal material for a can such as steel, tin plate, aluminum, or aluminum alloy. The tank 1 has a normal outer diameter of

A cylindrical body portion 2, a shoulder portion 3 which is connected to the upper end side in the tank axial direction of the body portion 2 and gradually reduces in diameter as it goes upward (the mouth portion side), and a mouth portion 4 which is provided continuously to the upper end side in the tank axial direction of the shoulder portion 3 and extends upward. The shoulder portion 3 has a reduced diameter portion whose diameter decreases from the body portion 2 side to the mouth portion 4 side. The mouth 4 has a flange 5 at its distal end. A known can lid, not shown, is wound around the mouth 4.

A bell (dome) portion 6 whose diameter is gradually reduced downward is provided on the lower end side (bottom side) of the body portion 2 of the tank 1.

Inner diameter of the mouth 4

For example, the thickness can be set to 25 to 60 mm.

In addition, the maximum outer diameter of the shoulder 3

In other words, the outer diameter of the portion where the shoulder 3 and the body 2 are connected to each other can be set to, for example, 50 to 70mm (the same as the outer diameter of the body 2 when the side surface of the body 2 is linear).

As shown in fig. 1, a solid forming portion is provided in a solid forming portion region 3a indicated by hatching in the shoulder portion 3. The three-dimensional forming part is provided with at least one of a concave part and a raised convex part.

The recessed concave portion is a three-dimensional shape that is concave when viewed from the outer surface of the can and convex when viewed from the inner surface of the can. The raised projection is a three-dimensional shape which is convex when viewed from the outer surface of the can and concave when viewed from the inner surface of the can.

For example, as shown in fig. 2 (a), the three-dimensional forming portion may have a plurality of recessed portions of the same shape at equal intervals over the entire circumference. For example, as shown in fig. 2 (b), the three-dimensional forming portion may be provided such that the recessed concave portions have different shapes in the circumferential direction.

In the example of fig. 2 (b), the three-dimensional formation portion is arranged in a plurality of rows along the shoulder height direction in the circumferential direction. A plurality of recessed recesses having the same shape are arranged in different numbers (for example, 1 to 4) in a plurality of rows. This causes the three-dimensional forming portion to have a different shape in the circumferential direction of the shoulder portion 3.

Alternatively, the three-dimensional forming portion may be provided intermittently at a part or a plurality of parts in the circumferential direction of the shoulder portion 3, for example. The three-dimensional formation portion may be a raised convex portion instead of a depressed concave portion, or a mixture of a depressed concave portion and a raised convex portion. In the case where a plurality of recessed or raised protrusions are provided, all of the protrusions may not have the same shape. The three-dimensional forming portion may be provided with either a recessed portion or a raised portion, or may be provided individually. The shape of the recessed or raised portions may be designed, for example, as geometric patterns, characters, symbols, humans, animals, plants, vehicles, appliances, landscapes, foods and drinks packed in containers, or the like.

The direction of depression of the depressed concave portions or the direction of protrusion of the raised convex portions can be appropriately set in consideration of the appearance, the shape of the shoulder portions 3, the direction in which the portions in the moving direction of the inner roller 11 and the outer roller 12 described later do not interfere, and the like.

Maximum outside diameter of shoulder of can 1

Relative to the inner diameter of the mouth of the can 1

The ratio of the ratio is preferably 1.05 to 1.58. By setting the diameter ratio as described above, the width of the shoulder portion 3 of the can 1 can be sufficiently wide, and thus the three-dimensional formation region 3a can be sufficiently wide. Further, the effect of the below-described solid forming portion rotation processing of the shoulder portion 3 by the nip between the receiving portion 11a of the inner roller 11 and the outer roller 12 is obtained.

The shoulder thickness t is preferably as thin as 0.1 to 0.3mm, and more preferably 0.1 to 0.2 mm. By setting the shoulder thickness t in this manner, three-dimensional decoration such as a three-dimensional formed portion can be applied to the shoulder 3 of the can 1 in which the material is reduced, and even if the three-dimensional formed portion is formed, it is difficult to form a fine hole such as a pinhole. Even if the shoulder thickness is thin as described above, the three-dimensional formed portion of the shoulder 3 can be processed by the rotation of the three-dimensional formed portion by the nip between the receiving portion 11a of the inner roller 11 and the outer roller 12, which will be described later.

Since the shoulder portion 3 is subjected to diameter reduction, the thickness of the shoulder portion 3 may be thicker than the thickness of the body portion 2 and the like. In this case, since the shoulder portion 3 has sufficient strength, the formation of pinholes and the like during processing can be further suppressed, and buckling and the like due to external force can be suppressed.

The shoulder 3 of the present embodiment is inclined in a truncated cone side surface shape in a moderate range (midrange) in the height direction. The inclination angle theta is set to 10 DEG to 50 DEG (more preferably 25 DEG to 45 DEG), thereby setting the inclination angle theta to a predetermined inner diameter of the mouth part

And a predetermined maximum outer diameter of the shoulder portion

The steeper the inclination gradient of the shoulder 3 is (the closer to the vertical), the wider the width of the shoulder 3 is, and the solid forming region 3a can be enlarged. Further, the effect of the below-described solid forming portion rotation processing of the shoulder portion 3 by the nip between the receiving portion 11a of the inner roller 11 and the outer roller 12 is obtained.

The inclination angle θ is an angle formed by a surface obtained by extending the shoulder portion 3 toward the main body portion 2 and the main body portion 2.

Further, the above shape of the shoulder portion 3 provides the following effects: the workability of the three-dimensional forming part and the strength of the can be improved, and the maximum outer diameter from the shoulder part can be formed within the range of the height direction of the can which is beautiful and effective

Reducing to the inner diameter of the mouth part

The tank of (1).

Next, a method for manufacturing the can 1 of the first embodiment will be described with reference to fig. 3 to 5.

The method of manufacturing the can 1 is a pre-step of manufacturing a bottomed cylindrical intermediate formed body provided with the main body portion 2 by known drawing and ironing, and performing printing, coating, and the like on the inner and outer surfaces as necessary. Then, the shoulder portion 3P is formed by performing processing such as necking and necking (swirl necking) in a plurality of known steps, and a combination of necking and necking in a plurality of steps.

Then, the intermediate formed body is formed with a mouth portion 4 having a flange 5 at the opening end by a known die flanger, rotary flanger, or the like.

Thereby, as shown in fig. 3 and the like, a tank 1P as an intermediate molded body of the tank 1 is manufactured.

Next, as shown in fig. 3, a three-dimensional forming portion is formed on the shoulder portion 3P by the three-dimensional forming portion processing apparatus 10 (can manufacturing apparatus). The three-dimensional forming part processing apparatus 10 includes an inner roll 11 and an outer roll 12 as a can manufacturing tool set. A receiving portion 11a is provided at the lower end of the inner roller 11. The shaft 11b and the receiving portion 11a may be coupled to each other by, for example, screwing. The receiving portion 11a is a portion (step portion) having an outer diameter larger than that of the shaft 11b and provided in a stepped manner in the inner roller 11.

In the receiving portion 11a of the inner roller 11, a mold having a concave (concave) portion or a convex (convex) portion corresponding to the three-dimensional forming portion is provided in a range shown by hatching. Further, in the outer roller 12, a convex (convex) or concave (concave) mold corresponding to the concavity or convexity of the receiving portion 11a is also provided in a range shown by hatching.

For example, the concave portion of the receiving portion 11a of the inner roller 11 and the convex portion of the outer roller 12 corresponding to the concave portion of the shoulder portion 3 shown in fig. 2 (a) are the same as those shown in fig. 4 (a). Similarly, the concave portions of the receiving portions 11a of the inner roller 11 and the convex portions of the outer roller 12 corresponding to the concave portions of the shoulder portions 3 shown in fig. 2 (b) are the same as those shown in fig. 4 (b).

The receiving portion 11a of the inner roller 11 may have at least one of a concave portion and a convex portion depending on the shape of the shoulder portion 3 of the can 1. That is, when the shoulder portion 3 has a raised convex portion, the receiving portion 11a may be provided so as to be convex. When the shoulder portion 3 has a concave portion and a raised convex portion, the receiving portion 11a may be provided to be convex and concave. The same applies to the convexities and concavities of the outer roller 12.

The shaft 11b as the rotation axis of the inner roller 11 has an outer diameter

Solid or hollow shaft-like.Outer diameter of shaft 11b

The material varies depending on the material, but in terms of strength, it is preferable that the shaft is a solid shaft

As described above, in the case of the hollow shaft, a cylinder having a thickness of 5mm or more is preferable.

Outermost diameter of the receiving portion 11a

Inner diameter of mouth of tank 1P

The inner roller 11 is small, and thus can be inserted into and taken out of the can 1P.

In the present embodiment, the maximum outer diameter of the shoulder is set

Inner diameter of the mouth portion of the can 1P

The ratio of the amounts of the components is set to 1.05 to 1.58. Therefore, the three-dimensional forming section region 3a can secure an effective width, and the receiving section 11a of the inner roller 11 can firmly support the shoulder section 3P of the tank 1P. Further, even if the shaft 11b has a sufficiently large thickness or thickness, the inner roller 11 can be inserted into and removed from the mouth 4.

The outer shape of the receiving portion 11a of the inner roller 11 is preferably a shape along the shoulder portion 3P of the can 1P. In the present embodiment, the shoulder portion is formed in an umbrella shape including a truncated cone-shaped side surface portion along the shape of the shoulder portion 3P. Accordingly, since the receiving portion 11a of the inner roller 11 can be formed in a shape closer to the shoulder portion 3P of the can 1P, the shoulder portion 3P of the can 1P can be supported more firmly in a rotation step (see fig. 5C) described later.

Both the tank 1P and the receiving portion 11a of the inner roller 11 have truncated cone-shaped side portions with a constant inclination angle. The truncated cone-shaped side surface portion is more preferable than a spherical side surface portion (a shape having a radius of curvature that is convex outward in the longitudinal section) because the machining force from the inner roll 11 and the outer roll 12 is more likely to be transmitted to the shoulder portion 3P.

As shown in fig. 3, 5 (C), etc., the outer shape of the receiving portion 11a of the inner roller 11 may be a shape that extends entirely along the shoulder portion 3P of the can 1P from the outer diameter of the shaft 11b to the outermost diameter portion of the receiving portion 11 a. However, the shape of the receiving portion 11a is not limited to this, and as long as the thickness of the shaft 11b can be sufficiently ensured, only a part of the receiving portion 11a may be formed along the shoulder portion 3P as shown in fig. 4 (a) and (b).

The inclination angle θ of the shoulder portion 3 of the tank 1P of the present embodiment is set to 10 ° to 50 °. Therefore, the receiving portion 11a of the inner roller 11 can secure an effective width for processing the solid forming portion region 3 a. Even if the shaft 11b has a sufficiently large thickness or thickness, the inner roller 11 can be inserted into and removed from the mouth 4. In addition, when the inner roller 11 and the outer roller 12 are brought close to the shoulder portion 3 from the radial direction of the tank 1 and sandwich the shoulder portion 3, the inclination in the normal direction of the shoulder portion 3 is not too steep with respect to the direction in which the forming force of the tank 1P acts (the radial direction of the tank 1P), and therefore the forming force is easily transmitted to the shoulder portion 3.

An angle θ formed by a surface of the shaft 11b extending toward the socket 11a and a side surface of the socket 11a and an angle formed by a surface of the shoulder 3 extending toward the body 2 and the body 2 are the same.

The outer shape of the outer roller 12 may correspond to the receiving portion 11a of the inner roller 11, and may be a shape capable of performing concave-convex rotational processing. In the present embodiment, the inner roller 11 and the outer roller 12 are in the shape of an umbrella with the top and bottom inverted.

As shown in fig. 3, when the solid forming portion is formed over the entire circumference of the shoulder portion 3 of the can 1, the outer diameter of the center in the height direction of the three-dimensional processing forming portion (hatched range) of the receiving portion 11a of the inner roller 11 is set to be larger than that of the solid forming portion

Height of the three-dimensional forming part relative to the shoulder part 3P of the can 1POuter diameter of center of range

The ratio may be set to a small value (for example, about 4/5), but it is preferably set to an outer diameter close to a fraction of "natural number equal to or greater than 2", and in the present embodiment, to about 1/2.

At this time, the outer diameter of the three-dimensional processing forming portion (hatched area) of the outer roller 12 at the center in the height direction

The outer diameter of the inner roller 11 may be larger than the outer diameter as long as the inner roller can conform to the irregularities of the receiving portion 11a of the inner roller

In the outer diameter, the diameter is

Is composed of

In the following case, it is preferable to set the values close to each other

Is a natural fraction of the outer diameter of (a). In the present embodiment, the

The three-dimensional forming section machining apparatus 10 further includes a mounting table 13, and the mounting table 13 is rotatable together with the tank 1P while the tank 1P is mounted thereon, and is capable of moving the tank 1P forward and backward between a pre-machining position and a machining position. The rotation axis of the mounting table 13 is parallel to the rotation axis of the inner roller 11. The direction of the rotation axis of the outer roller 12 is not particularly limited as long as it can follow the inner roller 11 and the shoulder 3P. In fig. 3, the mounting table 13, the inner roller 11, and the outer roller 12 are arranged such that their respective rotation axes are parallel to each other.

The rotation speed of the mounting table 13 during the rotation of the shoulder portion 3P of the tank 1P depends on the shape of the three-dimensional forming portion and the material of the tank 1PAnd other conditions, but in the low speed, preferably 10 ~ 300rpm, in the high speed, preferably 300 ~ 700 rpm. In the present embodiment, the rpm is set to 30rpm in the case of low speed, and is set to 400rpm in the case of high speed. Accordingly, the rotation speeds of the inner roller 11 and the outer roller 12 according to the present embodiment are determined by

The ratio of the two components was set at 60rpm and 30rpm in the low speed case and 800rpm and 400rpm in the high speed case.

Although not shown, the inner roll 11 and the outer roll 12 are rotated by a rotation driving device (rotating unit) of the three-dimensional forming unit machining device 10.

Next, the machining of the three-dimensional formed portion of the shoulder portion 3P in the present embodiment will be described with reference to fig. 5.

[ tank mounting step: FIG. 5 (a)

The tank 1P is placed on the mounting table 13 by a not-shown conveying device.

[ inner roller insertion step: FIG. 5 (b)

Next, the tank 1P is moved to the machining position by moving the mounting table 13.

Thereby, the inner roller 11 is inserted into the can 1P from the mouth 4.

[ shoulder holding step: FIG. 5 (C) ]

The inner roller 11 and the outer roller 12 are relatively close to the shoulder portion 3P of the can 1P, and the shoulder portion 3P is sandwiched between the receiving portion 11a and the outer roller 12. That is, the receiving portion 11a receives the shoulder portion 3P from the inside, while the outer roller 12 presses the shoulder portion 3P from the outside.

In fig. 5 (C), the inner roller 11 and the outer roller 12 move in the radial direction of the can 1P, but the present invention is not limited to this, and these rollers may move in the recessed direction of the concave portion of the three-dimensional forming portion, the protruding direction of the convex portion, or the like. In this way, when the shoulder portion 3P is machined by the receiving portion 11a of the inner roller 11 and the outer roller 12, interference between the portion of the three-dimensional forming portion where the concave or convex pattern is formed, the portion of the receiving portion 11a of the inner roller 11 where the concave or convex pattern is formed, the portion of the outer roller 12 where the convex or concave pattern is formed, and the like can be prevented.

In the roller retraction step described later, when the inner roller 11 and the outer roller 12 are separated from the shoulder portion 3, they may be moved in the direction according to the direction of the concavity of the three-dimensional forming portion or the direction of the convexity.

[ rotation step: FIG. 5 (C) ]

In a state where the shoulder portion 3P is nipped by the receiving portion 11a and the outer roller 12 in the nipping step, the inner roller 11 and the outer roller 12 are rotated, and the mounting table 13 and the tank 1P are integrally rotated. Then, the tank 1P is rotated by a predetermined amount (for example, by 1 turn or more), thereby forming a three-dimensional forming portion in the three-dimensional forming portion region 3 a.

At this time, the shoulder portion 3P is reliably supported from the inside by the receiving portion 11a of the inner roller 11, and is rotated while being sandwiched between the inner roller 11 and the outer roller 12. Therefore, even if the shoulder portion 3P of the can 1P is thin, abnormal deformation, damage, or the like is unlikely to occur.

[ roller retraction step: FIG. 5 (d) ]

Then, the rotation of the inner roller 11, the outer roller 12, and the mounting table 13 is stopped. The inner roller 11 and the outer roller 12 are radially spaced from the shoulder 3. Thereby, the inner roller 11 and the outer roller 12 are retracted to positions where they do not interfere with the tank 1 in the height direction of the tank 1.

[ tank evacuation step: FIG. 5 (e) ]

Then, the tank 1 is relatively separated from the machining position by moving the mounting table 13. Thereby, the can 1 is retracted from the machining position.

The inner roller 11 and the outer roller 12 move toward the mouth 4 in the height direction and move relative to the can 1. Thereby, the inner roller 11 moves from the mouth 4 to the outside of the tank 1P.

As described above, in the can manufacturing method of the present embodiment, the receiving portion 11a of the inner roller 11 receives the shoulder portion 3P from the inside and the shoulder portion 3P is formed in a three-dimensional shape, so that damage to the shoulder portion 3P can be suppressed.

[ second embodiment ]

Next, a second embodiment of the present invention will be explained.

In the following description and the drawings, the same reference numerals are used for portions that achieve the same functions as those of the first embodiment, and overlapping descriptions are omitted as appropriate.

In the second embodiment, each roller of the three-dimensional forming section processing apparatus according to the first embodiment is changed as follows.

As shown in fig. 6 (a) and (b), the rotation axis 12c of the outer roller 12 is not parallel to the rotation axes of the inner roller 11 and the mounting table 13, but is arranged so as to intersect or twist. In other words, the rotation axis 12c of the outer roller 12 is not parallel to the rotation axis 11c of the inner roller 11, but is in a different direction.

That is, the processed portion of the outer roller 12 in fig. 6 (a) is not a truncated cone as in the first embodiment, but a cylindrical member. The rotation axis 12c of the outer roller 12 is parallel to the inclined surface of the shoulder portion 3P. Therefore, the rotation axis 12c of the outer roller 12 intersects the rotation axis 11c of the inner roller 11 at the inclination angle θ.

Further, the circumferential surface of the outer roller 12 is pressed perpendicularly against the outer surface of the shoulder portion 3P (see arrow a 12). Therefore, the circumferential surface of the outer roller 12 and the receiving portion 11a of the inner roller 11 can sandwich the shoulder portion 3P with a strong force. This can improve the shaping property of the outer roller 12 and the inner roller 11 to the body formation region 3 a.

The outer roller 12 in fig. 6 (b) has a truncated cone-shaped reduced diameter portion 12a having a shape corresponding to the receiving portion 11a of the inner roller 11. The rotation axis 12c of the outer roller 12 is orthogonal to the rotation axis 11c of the inner roller 11 (see the angle θ 12). Thereby, the inner roller 11 and the outer roller 12 rotate in a bevel gear shape while pressing the shoulder portion 3P from the inside and the outside. In the embodiment (b) of fig. 6, when the inner roller 11 and the outer roller 12 rotate while sandwiching the shoulder portion 3P, the circumferential speeds of the portions where both sandwich the shoulder portion 3P can be made equal, or the difference between the circumferential speeds can be made small. This can reduce the sliding between the shoulder portions 3P and the inner and

outer rollers

11, 12, and thus can suppress damage to the shoulder portions 3P during processing.

In the embodiment (a) and (b) of fig. 6, the three-dimensional formed part processing apparatus 10 can increase the degree of freedom in setting the directions of the

rotating shafts

11c and 12c of the inner roller 11 and the outer roller 12.

Note that, as shown in fig. 6 (b), the can 1P may be a can after the shoulder portion 3P is formed and before the flange 5 is formed.

In addition, when the shoulder portion 3P of the can 1P before the flange 5 is formed with the three-dimensional forming portion, the diameter of the can be reduced by reducing the diameter of the mouth portion 4 and expanding or enlarging the shoulder portion P inward.

The can 1P of fig. 7 includes a three-dimensional portion region 2a in the main body portion 2, in addition to the shoulder portion 3P.

The inner roller 11 is provided with a body inner pressing portion 11d from the receiving portion 11a toward the lower side.

The barrel inner pressing portion 11d is a cylindrical member. In the range hatched on the peripheral surface of the main body inside pressing portion 11d, at least one of a concave portion and a convex portion having a shape corresponding to the three-dimensional forming portion of the three-dimensional forming portion region 2a is provided, similarly to the receiving portion 11 a.

Similarly, the outer roller 12 is provided with a body portion outer pressing portion 12d from the truncated cone portion toward the lower side.

The body portion outer pressing portion 12d is a cylindrical member. The body portion outer pressing portion 12d has at least one of a concave portion and a convex portion having a shape corresponding to the body portion inner pressing portion 11d in a range shown by hatching on the peripheral surface thereof.

In processing the can 1P, the inner roller 11 and the outer roller 12 sandwich the shoulder portion 3P of the can 1P, and the body portion inside pressing portion 1ld and the body portion outside pressing portion 12d sandwich the body portion 2 from inside and outside. Thereby, the main body inside pressing portion 11d is in a state of pressing the main body 2 from the inside, and the main body outside pressing portion 12d is in a state of pressing the main body 2 from the outside. In this state, the inner roller 11 and the outer roller 12 rotate relative to the can 1P, and thereby the inner roller 11 and the outer roller 12 can form the solid forming portions simultaneously in the solid forming

portion regions

2a and 3a of the main body portion 2 and the shoulder portion 3P.

Thus, the inner roller 11 and the outer roller 12 shown in fig. 7 can decorate the body portion 2 and the shoulder portion 3P of the can 1P in the same step.

[ sizing of tank 1 and inner roll 11 ]

An example of setting the dimensions of the tank 1 and the inner roller 11 in the above embodiment will be described.

Fig. 8 (a) is a cross-sectional view of the upper portion of the tank 1, and schematically shows the inner roller 11.

Fig. 8 (B) is an enlarged view of a portion B of fig. 8.

The receiving portion 11a of the inner roller 11 in fig. 8 is the simplest structure, and is formed only by a portion corresponding to the three-dimensional forming portion region 3a of the can 1. Therefore, the entire truncated cone-shaped side surface of the receiving portion 11a is in a range in which projections and depressions corresponding to the three-dimensional forming portion of the three-dimensional forming portion region 3a can be formed.

The reference numerals shown in fig. 8 are shown below.

A (mm): caliber of mouth 4 of tank 1

B (mm): maximum outer diameter of shoulder 3 (i.e., diameter of main body 2 of can 1)

C (mm): gap between the mouth 4 and the receiving portion 11a of the can 1

D (mm): shaft diameter of shaft 11b of inner roll 11

E (mm): outer diameter of socket (maximum outer diameter of socket 11a)

W1: the total length in the direction along the inclination direction of the shoulder 3 of the can 1

W2: the length of the three-dimensional forming part, that is, the length of the three-dimensional forming part region 3a which can be arranged in the shoulder part 3 in the range from the root part on the mouth part 4 side toward the body part 2 side in the direction along the inclination direction of the shoulder part 3 of the can 1 can be set

Note that the example of fig. 8 is a diagram illustrating a basic concept of size setting, and therefore the thickness of the tank 1 is not considered, but when this is considered, "B: maximum outer diameter "of shoulder 3 of can 1, and" a: the inner diameter of the mouth 4 of the can 1 ", and the like.

As shown in fig. 8 (b), in the dimension of the tank 1, the radial lengths corresponding to the lengths W1 and W2 are the length L1 of the side bc of the triangle abc and the length L2 of the side de of the triangle ade, respectively, and can be expressed by the following equation.

L1＝(B-A)/2

The length L3 of the projection of the receiving portion 11a in the radial direction is equal to the length L2.

Therefore, the length L2 can be expressed by the following equation.

L2＝L3

L2＝(A-2×C-D)/2

Since the triangles abc and ade are similar, the following relationship holds.

W2/W1＝L2/L1＝[(A-2×C-D)/2]/[(B-A)/2]

W2/W1＝(A-(2×C+D))/(B-A)

The above formula can be arranged as follows.

2 XC + D ═ A- (B-A). times.W 2/W1. formula 1

In consideration of practical workability, the clearance C (mm) is preferably "1. ltoreq. C". In consideration of the strength of the shaft 11b, the shaft diameter D (mm) is preferably "10. ltoreq.D". Then, the following relational expression holds for expression 1.

12 or less A- (B-A) xW 2/W1. formula 2

That is, the tank 1 satisfying the expression 2 can secure a sufficient gap for inserting and removing the inner roller 12 into and from the mouth portion 4, and can secure a sufficient strength of the shaft 11b, thereby providing an effect of good workability.

For example, in the can 1 in which the expression 2 and the expression "W2/W1 ≦ 0.5" are satisfied, in addition to the above-described effects, the three-dimensional portion forming region 3a can be disposed at a portion of the shoulder portion 3 which is half way up from the root portion of the shoulder portion 3 on the mouth portion 4 side toward the body portion 2 side.

In addition to the above effects, the tank 1 in which the expression 2 and "W2/W1 ≦ 1" are satisfied has an effect that the three-dimensional forming region 3a can be arranged over the entire shoulder portion 3.

Next, the size setting of the inner roller 11 will be explained.

The length W3 of the slope of the truncated cone-shaped side surface of the receiving portion 11a is equal to the length W2 at which the solid forming portion can be provided.

Therefore, the projection length L3 of the receiving portion 11a in the radial direction can be expressed by the following equation.

L3＝W3×sinθ＝W2×sinθ

Therefore, the socket outer diameter E is as follows.

E＝D+2×L3

E＝D+2×W2×sinθ

Here, in order to insert the socket 11a (outer diameter E) into the inside (bore a) of the socket 4, the following condition needs to be satisfied.

E+2×C≤A

D+2×W2×sinθ+2×C≤A

The above formula can be arranged as follows.

D.ltoreq.A-2 × (C + W2 × sin θ) ·, formula 3

That is, the inner roller 11 can be inserted into and removed from the mouth 4 by satisfying equation 3, and thus the shoulder 3 of the can 1 can be processed.

The clearance C (mm) is preferably "1. ltoreq. C" as described above. Therefore, the inner roll 11 can improve workability by satisfying "1. ltoreq. C" in addition to expression 3.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications and changes can be made as described in a modification mode and the like described later, for example, and these are also within the technical scope of the present invention. The effects described in the embodiments are merely the most preferable effects produced by the present invention, and the effects of the present invention are not limited to the effects described in the embodiments. The respective configurations of the above-described embodiment and the modifications described below can also be combined and used as appropriate, but detailed description thereof is omitted.

[ means of modification ]

(1) The outer roller may be configured such that the outer roller is rotated at a large diameter portion and the can is inserted and discharged at a small diameter portion, as in the outer roller 102 shown in fig. 4 of patent document 1 and the outer roller 4 shown in fig. 2 and 3 of japanese patent application laid-open publication No. 2011-005512. Further, the tank holding mechanism (mounting table) may be configured to be movable forward and backward with respect to the inner roller, thereby providing a device configuration for performing the tank insertion, the shoulder rotation processing, and the tank discharge.

(2) When the shoulder portion is expanded or added, the method of processing the three-dimensional forming portion of the present invention may be further used, and the three-dimensional forming portion may be further provided on the expanded shoulder portion or the added shoulder portion. When the three-dimensional forming portion is further provided, the printing mark or the unevenness of the can may be detected to determine the reference position, and the machining position may be determined in contrast thereto, in order to align the three-dimensional forming portion formed in the previous step with the pattern or the like.

(3) In the can manufacturing method, the screw portion forming step may be provided after the rotation process for forming the three-dimensional formed portion, whereby a threaded can in which a jaw portion, a screw portion, a curl portion, and the like are formed at the mouth portion of the can having a reduced diameter is obtained.

(4) The can may be a three-piece can in which the bottom portion, the body portion, and the lid portion are different members. In this case, the solid forming portion may be formed on the body portion before the bottom portion and the lid portion are provided. In this case, the inner roller may be inserted into the can from the bottom side rather than from the mouth side.

(5) In the embodiment, an example in which the three-dimensional forming portion is formed on a shoulder portion of the can or the like is shown, but the present invention is not limited thereto. The solid forming portion may be formed on a bell portion of the tank, for example. That is, the bell portion may be a form of a shoulder portion.

(6) In the embodiment, the shoulder portion of the can is an inclined portion inclined linearly, but the present invention is not limited to this. The shoulder of the can may be, for example, a curved portion or the like. In this case, the processing surfaces of the inner and outer rollers may have curved surfaces corresponding to the curved portions and the like. In this case, by appropriately modifying each configuration of the embodiment so as to correspond to the bent portion or the like, it is possible to process the shoulder portion having the bent portion or the like by applying the concept of the embodiment.

The documents described in the present specification and the japanese application specification which is the basis of the priority of the paris convention of the present application are incorporated herein in their entirety.

Description of reference numerals:

1. 1P: pot for storing food

2: main body part

2a, 3 a: three-dimensional forming part region

3. 3P: shoulder part

4: mouth part

5: flange

10: three-dimensional forming part processing device

11: inner roller

11 a: receiving part

11 b: shaft

11 d: pressing part in main body part

12: outer roller

12 a: diameter reducing part

12 d: external pressing part of main body part

13: a placing table.

Claims

1. A method for manufacturing a can, characterized in that,

the can manufacturing method includes the following steps:

a shoulder portion having a wall thickness of 0.1 to 0.3mm, which gradually decreases in diameter toward the mouth portion side of the cylindrical can, is formed on the axial end side of the cylindrical can body; and

forming a body forming portion on the shoulder portion by an inner roller and an outer roller, the inner roller including a receiving portion having at least one of a concave portion and a convex portion that receives the shoulder portion from an inner side, the receiving portion including a reduced diameter portion corresponding to a shape of the shoulder portion formed in advance in a step of forming the shoulder portion, the outer roller pressing the shoulder portion from an outer side and including at least one of a concave portion and a convex portion corresponding to the receiving portion of the inner roller,

the method for manufacturing a can includes the following steps in the step of forming the three-dimensional forming part: the inner roller and the outer roller are rotated relative to the tank in a state where the shoulder portions are sandwiched from the inside and the outside so that the receiving portions of the inner roller and the outer roller face each other with the shoulder portions interposed therebetween.

2. The can manufacturing method according to claim 1,

the ratio of the maximum outer diameter of the shoulder to the inner diameter of the mouth of the can is 1.05 to 1.58.

3. The can manufacturing method according to claim 1 or 2,

the receiving portion has an umbrella shape along the shape of the shoulder portion.

4. The can manufacturing method according to claim 1 or 2,

an angle formed by a surface obtained by extending the shoulder portion toward the main body portion side and the main body portion is 10 ° to 50 °.

5. The can manufacturing method according to claim 1 or 2,

after the rotation, the mouth portion is reduced in diameter to form a threaded portion.

6. The can manufacturing method according to claim 1 or 2,

the inner roller includes a main body inner pressing portion that presses the main body from inside and has at least one of a concave portion and a convex portion,

the outer roller includes a main body outer pressing portion that presses the main body from outside and has at least one of a concave portion and a convex portion corresponding to the inner roller,

the inner roller and the outer roller are rotated relative to the can in a state where the body portion is sandwiched from the inside and the outside by the body portion inside pressing portion and the body portion outside pressing portion, whereby at least one of a concave portion and a convex portion is formed in the body portion.

7. The can manufacturing method according to claim 1 or 2,

the outer roller has a reduced diameter portion corresponding to the receiving portion of the inner roller,

the inner roller and the outer roller have rotating shafts in different directions, and rotate in a bevel gear shape while pressing the shoulder portions from the inside and the outside.

8. The can manufacturing method according to claim 1 or 2,

the inner diameter of the mouth part is 25-60 mm,

the maximum outer diameter of the shoulder is 50-70 mm.

9. The can manufacturing method according to claim 1 or 2,

an angle θ between a surface of the inner roller extending toward the receiving portion and the receiving portion is 10 ° to 50 °.

10. The can manufacturing method according to claim 1 or 2,

the diameter of the shaft of the inner roller is D,

The inner diameter of the mouth part is A,

The length of the bearing part is W2,

The gap between the mouth part and the shaft of the inner roller is C,

When the angle formed by the receiving portion and the surface obtained by extending the axial direction of the inner roller toward the receiving portion side is θ,

D.ltoreq.A-2 × (C + W2 × sin θ).

11. The can manufacturing method according to claim 1 or 2,

the diameter of the shaft of the inner roller is D (mm),

The inner diameter of the mouth part is A (mm),

The length of the bearing part is W2(mm),

A clearance between the mouth and the shaft of the inner roller is C (mm),

satisfies 12. ltoreq. D.ltoreq.A-2 × (C + W2 × sin θ), and 1. ltoreq. C.

12. A can manufacturing apparatus for forming a three-dimensional forming portion at a shoulder portion of a can,

the tank manufacturing apparatus includes:

an inner roller having a receiving portion for receiving the shoulder portion from the inside;

an outer roller that presses the shoulder portion from an outer side; and

a rotating section that rotates the inner roller and the outer roller relative to the tank,

the shoulder portion is formed so as to gradually decrease in diameter toward the mouth portion side of the cylindrical can at the axial end side of the cylindrical can body, and has a wall thickness of 0.1 to 0.3mm,

the receiving portion of the inner roller has at least one of a concave portion and a convex portion, and includes a reduced diameter portion corresponding to the shape of the shoulder portion formed in advance in the step of forming the shoulder portion,

the outer roller includes at least one of a concave portion and a convex portion corresponding to the receiving portion of the inner roller,

the inner roller and the outer roller are rotated by a rotating portion in a state where the shoulder portion is sandwiched from the inside and the outside so that the receiving portion of the inner roller and the outer roller face each other with the shoulder portion interposed therebetween.

13. A can manufactured by the can manufacturing method of any one of claims 1 to 11,

the shoulder portion is provided with at least one of a concave portion and a convex portion, the shoulder portion is formed in a manner that the diameter of the shoulder portion gradually decreases toward the opening portion side of the tank on the tank axial direction end side of the cylindrical tank body portion, and the wall thickness is 0.1-0.3 mm,

the inner diameter of the mouth part is 25-60 mm,

the maximum outer diameter of the shoulder part is 50-70 mm,

the inner diameter of the mouth part is A (mm),

The maximum outer diameter of the shoulder part is B (mm),

The total length of the shoulder part is W1(mm),

In the case where at least one of the concave portion and the convex portion is provided in the range of W2(mm) from the mouth-side root portion in the shoulder portion,

satisfies 12. ltoreq. A- (B-A). times.W 2/W1.

14. A can manufactured by the can manufacturing method of any one of claims 1 to 11,

the ratio of the maximum outer diameter of the shoulder part to the inner diameter of the mouth part is 1.05 to 1.58,

the inner diameter of the mouth part is A (mm),

The maximum outer diameter of the shoulder part is B (mm),

The total length of the shoulder part is W1(mm),

satisfies 12. ltoreq. A- (B-A). times.W 2/W1.

15. Tank according to claim 13 or 14,

16. Tank according to claim 13 or 14,

satisfies W2/W1 not more than 0.5.

17. Tank according to claim 13 or 14,

satisfying W2/W1 ≤ 1.

18. A can manufacturing tool kit, which forms a three-dimensional forming part on a shoulder part of a can,

the can manufacturing tool kit is characterized in that,

the can manufacturing tool set comprises an inner roller and an outer roller, wherein the inner roller and the outer roller form a body forming part at the shoulder part, the shoulder part is formed in a mode that the diameter of the shoulder part is gradually reduced along the end side of the cylindrical can body part in the axial direction of the can and the wall thickness is 0.1-0.3 mm,

the inner roller includes a receiving portion having at least one of a concave portion and a convex portion for receiving the shoulder portion from inside, and a reduced diameter portion corresponding to a shape of the shoulder portion formed in advance in a step of forming the shoulder portion,

the outer roller presses the shoulder portion from the outside and includes at least one of a concave portion and a convex portion corresponding to the receiving portion of the inner roller,

the receiving portion of the inner roller and the outer roller rotate relative to the tank while sandwiching the shoulder portion from the inside and the outside so as to face each other with the shoulder portion interposed therebetween.