JP5609526B2 - Can body and can body forming tool - Google Patents

Description

  The present invention relates to a can body and a can body forming tool, and more particularly, to a can body and a can body forming tool that can reduce the thickness of a metal material to be used by improving mechanical strength.

Conventionally, three-piece cans, seamless cans, and the like have been used as cans used for beverages and the like.
The three-piece can is formed by forming a metal plate into a cylindrical shape, joining opposite ends by welding, bonding, etc. to form a side seamed can barrel, and winding up a canopy and a bottom lid on both ends of the can barrel It is as. Seamless cans are formed by punching a metal plate into a disk-shaped blank and drawing-ironing, or stretch drawing (thinning drawing) to form a bottomed cylindrical can body. It is set as the structure which wound the lid | cover on the upper end of.

  In the can body as described above, it is possible to reduce the thickness of the metal plate without deformation due to impact during transportation, etc., or reduced pressure in the can after sterilization performed after filling the contents. The establishment of such technology is desired, and various technologies are being researched and developed.

For example, Patent Document 1 is excellent in deformation resistance in which at least a part of a can body is formed with a drawn part or an overmolded part and an unprocessed part, one of which is formed in a circumferential relationship with a panel and the other as a frame. Techniques for canned cans (can bodies) are disclosed. In this technique, each of the panel and the frame is located on a cylindrical surface having a different diameter, and the panel and the frame are arranged on an arbitrary cross section across the axial direction and the circumferential direction of the can body. Are always arranged in alternating phases.
Moreover, this patent document 1 also discloses an example in which the panel is a hexagon, and in this technique, the panel and the frame are curved surfaces corresponding to the can body.

In Patent Document 2, a circumferential polyhedral wall is formed on at least a part of the can body, and the polyhedral wall has a structural unit surface, a boundary ridgeline where the structural unit surfaces contact each other, and a crossing portion where the boundary ridgelines intersect. The boundary ridge line and the crossing portion are relatively convex to the outside of the container as compared with the structural unit surface, and the structural unit surface has a smoothly recessed portion between the opposing crossing portions. A thin metal container (can) is disclosed in which the axial arrangement of containers adjacent to each other in the circumferential direction forms a phase difference.
Also, Patent Document 2 discloses an example in which the structural unit surface is a hexagon, and in this technology, the structural unit surface is smoothly curved.

Further, in Patent Document 3, a plurality of identical rectangular flat surfaces are formed in the circumferential direction and the axial direction of the can body, and the flat surfaces adjacent to each other in the circumferential direction are arranged to be connected to each other via a boundary ridgeline. As a result, when the can body is viewed in cross section, a polygonal shape is formed, and the flat surfaces adjacent to each other in the can axis direction are arranged in such a manner that the can bodies arranged at predetermined intervals are shifted in the circumferential direction. It is disclosed. In this can body, the lower end of the upper boundary ridge line and the upper ends of a pair of boundary ridge lines on both sides of the lower flat surface located immediately below the boundary ridge line are positioned between the flat surfaces adjacent to each other in the can axis direction. A pair of connecting ridge lines are formed, a triangular inclined surface that inclines from a pair of adjacent connecting ridge lines toward the lower edge of the upper flat surface, and a lower flat surface from a pair of adjacent connecting ridge lines Triangular inclined surfaces inclined toward the edge are alternately formed in the circumferential direction.
Further, in the can body of Patent Document 3, the boundary ridge line and the connecting ridge line form a hexagon, and a rectangular flat surface and a pair of triangular inclined surfaces are formed in the hexagon.

  Further, in Patent Document 4, as a technique related to a can forming apparatus, an inner roller having an uneven polyhedron on the outer periphery and an outer roller having a polyhedron opposite to the inner roller on the outer periphery are synchronously rotated, and the inner roller is rotated. A peripheral polyhedral wall can manufacturing apparatus (can forming apparatus) for forming a polyhedral shape on the side wall of the can body sandwiched between the outer roller and the outer roller, and a forming tool therefor are disclosed.

Japanese Patent Publication No. 6-78096 Japanese Patent Publication No. 7-5128 JP-A-10-328772 JP-A-9-192863

However, although the cans of Patent Documents 1 to 3 have improved mechanical strength (also referred to as deformation strength), further improvement in mechanical strength has been demanded. That is, there is no deformation due to impact during transportation or decompression in the can after sterilization performed after filling the contents, and from the viewpoint of storage stability of contents such as beverages and foods, the inner surface of the can body There has been a demand for the establishment of a technique that can prevent coating defects and can further reduce the thickness of the metal plate.
In addition, in beverage cans such as canned coffee, it has also been desired to improve the commercial value (for example, the aesthetic appearance).
Furthermore, in a molding apparatus or a molding tool (mold) that molds a can body of a can body into an uneven shape, it has been desired to prevent damage to the can body and improve molding accuracy.

  The present invention has been proposed in order to meet the above demands, and it is possible to reduce the thickness of the metal material to be used by improving the mechanical strength, to prevent coating defects on the inner surface of the can body, It aims at providing the shaping | molding tool used for the can body which improved value, and the shaping | molding apparatus of the can body.

In order to achieve the above object, the can body of the present invention has a frame portion disposed on the can body and having an inclined surface, and a panel portion surrounded by the frame portion and having a flat surface, the frame portion being It protrudes from the virtual extension plane obtained by extending the panel section, when the protruding amount of the frame portion from the virtual extension plane increases, depending on the amount of out projecting, have a portion where the inclined surface is longer, the longer inclined surface is a structure that has twisted with becomes part.

  The can body forming tool of the present invention is the above can body forming tool, and has a frame portion forming convex portion and a panel portion forming concave portion on an outer peripheral surface, and the center of the panel portion forming concave portion. A polygonal inner roller having a ridge line on the outer peripheral surface, and a frame portion forming convex portion and a panel portion forming concave portion curved in the circumferential direction respectively corresponding to the frame portion forming convex portion and the panel portion forming concave portion of the inner roller. And a formed outer roller.

According to the can body of the present invention, by improving the mechanical strength, deformation due to reduced pressure in the can and coating defects on the inner surface of the can body can be prevented, and the metal material to be used can be made thinner and manufactured. Cost reduction, resource saving, weight reduction, etc. can be achieved.
Further, by forming the frame portion and the panel portion of various shapes on the can body, it is possible to provide a unique three-dimensional feeling and aesthetic appearance based on these shapes, and to improve the commercial value and the like.
Further, according to the can body forming tool of the present invention, the amount of pushing when forming the panel portion by the inner roller and the outer roller is regulated by the ridge line provided in the recess portion for forming the panel portion of the inner roller, and damage to the can body is caused. Therefore, the destruction of the panel portion can be prevented and stable molding can be performed, and the molding accuracy can be improved.

FIG. 1 is a schematic front view of a can body according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG. FIG. 3 is a schematic enlarged view of a portion C in FIG. FIG. 4 shows a schematic enlarged view of a portion B in FIG. 5A is a schematic enlarged cross-sectional view taken along the line DD of FIG. 4, and FIG. 5B is a schematic enlarged cross-sectional view taken along the line EE of FIG. 4. FIG. 6 shows a schematic enlarged view of Application Example 1 of the present invention. FIG. 7 shows a schematic enlarged view of Application Example 2 of the present invention. FIG. 8 shows a schematic enlarged view of an application example 3 of the present invention. FIG. 9: has shown the schematic perspective view of the inner roller of the shaping | molding tool of the can body concerning embodiment of this invention. FIG. 10: has shown the schematic perspective view of the outer roller of the shaping | molding tool of the can body concerning embodiment of this invention. FIG. 11: has shown the processing schematic by the shaping tool concerning embodiment of this invention.

[Embodiment of can body]
FIG. 1 is a schematic front view of a can body according to an embodiment of the present invention.
In FIG. 1, a can body 1 of the present embodiment includes a bottomed cylindrical can body 11 and a lid 12. The can body 1 includes a plurality of frame portions 2 disposed around the entire circumference of the central portion of the can body 11 in the height direction, and a plurality of panel portions 3 surrounded by the frame portion 2 and having a flat surface. The upper and lower portions of the can body 11 are cylindrical. Moreover, in this embodiment, the surface of each panel part 3 is a flat surface, or almost all are flat surfaces.

In addition, although the can 1 of this embodiment is a seamless can, it is not specifically limited, For example, a three-piece can etc. may be sufficient.
In addition, the can body 1 is provided with a plurality of frame portions 2 around the entire circumference of the central portion in the height direction of the can body 11, but is not limited to this, for example, the height of the can body 11. The frame part 2 should just be arrange | positioned in at least one part of the direction.
Further, the material of the can body 11 is a metal plate such as tin-free steel (tin-free steel plate), tin plate, or aluminum plate.

(Frame part)
As described above, the frame portion 2 is disposed on the entire circumference of the central portion in the height direction of the can body 11. That is, the frame portion 2 includes two axial portions 21 that are parallel to the axis of the can body 11 and four circumferential portions 22 that are disposed substantially along the circumferential direction of the can body 11. When viewed from the side of the can body 11, it has a hexagonal shape. In addition, a plurality of (in this embodiment, 11 (circumferential direction) × 4 stages (vertical direction) = 44) frame portions 2 have no gap on the entire circumference of the can body 11 (adjacent frame portions 2 are They are arranged in a state of sharing the axial portion 21 and the circumferential portion 22.
In addition, the shape of the frame part 2 means the external shape (the external shape seen from the side surface direction of the can body 11) by the axial direction part 21 and the circumferential direction part 22. FIG.

FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG.
FIG. 3 is a schematic enlarged view of a portion C in FIG.
FIG. 4 is a schematic enlarged view of a portion B in FIG.
5A is a schematic enlarged cross-sectional view taken along line DD of FIG. 4, and FIG. 5B is a schematic enlarged cross-sectional view taken along line EE of FIG.
2-5, the frame part 2 (the axial direction part 21 and the circumferential direction part 22) protrudes outside the virtual extension plane 30 which extended the flat surface of the panel part 3 mentioned later.

That is, as shown in FIG. 3, the axial portion 21 of the frame portion 2 protrudes outside the virtual extension plane 30 that extends the panel portion 3 (the protrusion amount is h ₀ ). Each axial portion 21 has a pair of flat or substantially flat inclined surfaces 211, and the cross-sectional shape of the axial portion 21 is a mountain shape (a shape composed of two sides of an isosceles triangle). Note that a portion where the inclined surfaces 211 intersect with each other and a portion where the inclined surface 211 and the flat surface of the panel portion 3 intersect are usually curved surfaces having a radius of curvature for suppressing damage to the can body 11. The inclination direction of the length of the inclined surface 211 (i.e., from the ridge line in the axial portion 21, to the line of intersection of the flat surface of the inclined surface 211 and the panel portion 3 and the cross length) is L _0.

Further, as shown in FIG. 5, the circumferential portion 22 of the frame portion 2 has two inclined surfaces 221, and projects outward from a virtual extension plane 30 that extends the panel portion 3.
Here, the amount of protrusion in the middle of the ridgeline of the circumferential portion 22 (appropriately abbreviated as DD cross section) is h ₁ (see FIG. 5A), and the ridgelines of the circumferential portion 22 are different. The amount of protrusion of the intersecting point (appropriately abbreviated as EE cross section) is h ₂ (see FIG. 5B).
The cross-sectional shape of the DD cross section of the circumferential portion 22 is a mountain shape (a shape composed of two sides of a triangle). Further, the length in the inclined direction of the DD cross-section portion of the inclined surface 221 (that is, from the ridge line of the circumferential portion 22 to the intersection line where the inclined surface 221 and the flat surface of the panel portion 3 intersect each other) the length of the axial direction) is L _1. Further, the inclination angle of the inclined surface 221 with respect to the virtual extension plane 30 is alpha _1.
On the other hand, the cross-sectional shape of the EE cross section of the circumferential portion 22 is a shape that connects the flat surface of the panel portion 3 and the ridge line of the circumferential portion 22 linearly or substantially linearly. Further, the length of the inclined surface 221 along the EE cross section (that is, from the ridge line of the circumferential portion 22 to the intersection line where the inclined surface 221 and the flat surface of the panel portion 3 intersect each other) the length of the axial direction) is L _2. Furthermore, the inclination angle of the inclined surface 221 with respect to the virtual extension plane 30 is α ₂ .

The relationship between the above dimensions is h ₀ <h ₁ <h ₂ , L ₀ <L ₁ <L ₂ , α ₂ <α ₁ . That is, since h ₁ <h ₂ , L ₁ <L ₂ , α ₂ <α ₁ , each circumferential portion 22 has a twisted inclined surface 221, and a frame portion from the virtual extension plane 30. When the protrusion amount of 2 (circumferential portion 22 in this embodiment) increases, the inclined surface 221 becomes longer according to the protrusion amount. Thereby, in the intersection part (EE cross-section part) of the circumferential direction part 22 and its vicinity, the stress concentration at the time of shaping | molding is avoided, and the malfunction of giving damages, such as a coating defect, to the inner surface of the can body 11 is avoided. Can do.
In the two circumferential portions 22 that intersect, the two inclined surfaces 221 on the panel portion 3 side have a boomerang shape or a substantially boomerang shape.

Further, as indicated by broken lines in FIG. 4, each ridgeline of the frame portion 2 is linear or substantially linear. In this way, the frame part 2 acts as a strong beam, and is axially or axially applied to the can body 1 by impact during transportation, decompression after filling and sterilization of contents, or increase in internal pressure of the can during sterilization. Even when a radial deformation force acts, mechanical strength such as buckling resistance or deformation resistance against the inside and outside in the radial direction can be improved.
Moreover, although the radial direction position of the intersection of each ridgeline of the frame part 2 is normally the same as the outer diameter of the can body 11, it is not limited to this. For example, it may be located inside the outer diameter of the can body 11 or may be located outside.

(Panel part)
As described above, the panel portion 3 is surrounded by the axial portion 21 and the circumferential portion 22 of the frame portion 2 and has a flat surface. In the present embodiment, the surface of each panel unit 3 is a flat surface, or almost all of it is a flat surface. Thereby, the shape of the panel part 3 and the frame part 2 can be formed correctly and accurately, and the rib function of the frame part 2 can be strengthened.
Moreover, since the panel part 3 is connected to the circumferential portion 22 composed of the inclined surface 221, the stress concentration at the time of depressurization to the panel part 3 is alleviated, and at the time of the increase in the internal pressure of the can during retort sterilization Excessive bulging or partial deformation is prevented, and the mechanical strength of the can 1 can be improved.

Here, the shape of the flat surface of the panel unit 3 is a non-similar shape to the ridge line shape of the frame unit 2. That is, in the present embodiment, the shape of the flat surface of the panel unit 3 corresponds to the shape of the frame unit 2 described above, as shown in FIG. And the length W ₁ and the length W ₀ have a relationship of 1.2 ≦ W ₁ / W ₀ ≦ 1.8, and are formed in the circumferential portion 22 of the frame portion 2 described above. The inclined surface 221 is a hexagonal shape that is not similar to the ridgeline shape of the frame portion 2. Thus, the double honeycomb structure hexagonal shape of the frame part 2 and the panel part 3 is combined, and the mechanical strength of the can 1 can be further improved.

Moreover, in this embodiment, as mentioned above, although 11 panel parts 3 were arranged in parallel in the circumferential direction of the can body 11, this quantity is not limited to 11 pieces, The quantity may be appropriately determined in consideration of the body diameter, height, design, metal material used, and the like.
Furthermore, the can body 1 has a polygonal shape (in this embodiment, a regular 11-sided shape) as shown in FIG. The mechanical strength of the can 1 can be improved.

[Experimental example]
Tin-free steel (tin-free steel plate) is used for drawing-thinning drawing (stretch draw molding), can body diameter: 53 mm, can body height 105 mm, internal volume: 190 ml, and can body plate thickness: 0 A 15 mm bottomed seamless can was made.
Next, using the device described later for the seamless can, a hexagonal frame portion shown in FIG. 1 and a flat surface surrounded by the frame portion, a hexagonal shape that is dissimilar to the ridgeline shape of the frame portion. A shaped panel part was molded. At this time, a plurality of seamless cans were manufactured by changing the depth from the intersection of the circumferential direction of the can body and the frame portion to the flat surface of the panel portion. Subsequently, the aluminum lid was rolled up, the depth of the panel portion was changed, and the paneling strength of each can was measured. The measurement results are shown in Table 1. Radial position of the intersection of each ridge line of the frame part 2

In addition, the paneling strength in Table 1 is the measurement of each can body in which the panel portion having the flat surface surrounded by the frame portion is not formed and the depth of the panel portion being formed. It is an average value of 5 cans.
In addition, the paneling strength was measured by storing the can in a sealed case, applying pressure from the outside with air, and reading the gauge pressure at the time when deformation started to obtain the paneling strength.

  From the experimental example, a can body having a hexagonal frame portion and a flat surface surrounded by the frame portion, and forming a hexagonal panel portion that is not similar to the ridgeline shape of the frame portion, has its paneling strength. Was found to improve dramatically.

As described above, according to the can 1 of the present embodiment, the mechanical strength is improved, and the metal material to be used can be thinned. Thereby, cost reduction of manufacturing cost, resource saving, weight reduction, etc. can be achieved.
Further, the can body 1 has a unique three-dimensional shape based on a double hexagon by forming a straight hexagonal frame portion 2 and a flat hexagonal panel portion 3 on the can body 11. A feeling and aesthetics can be provided, and the product value can be improved.

<Application example 1 of can body>
FIG. 6: has shown the schematic enlarged view of the application example 1 of the can of this invention.
In FIG. 6, the can body of this application example is different from the can body 1 in that a frame portion 2 a obtained by rotating the frame portion 2 by 90 ° is provided.
The other configuration is substantially the same as that of the can body 1, and the same components as those of the can body of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

(Frame part)
The frame portion 2a of the can body of the present application example is disposed on the entire circumference of the central portion in the height direction of the can body 11a. That is, the frame portion 2a includes four axial portions 21a that are disposed substantially along the axial direction of the can body 11a, and two circumferential portions 22a that are disposed along the circumferential direction of the can body 11a. And has a hexagonal shape when viewed from the side of the can body 11a.

Although not shown, the frame portion 2a (the axial portion 21a and the circumferential portion 22a) protrudes outward from a virtual extension plane 30 that extends a flat surface of the panel portion 3a described later.
Here, the amount of protrusion in the middle of the ridgeline of the axial portion 21a (appropriately abbreviated as FF cross section) is _h1a , and the ridgeline of the axial portion 21a and the ridgeline of the circumferential portion 22a intersect each other. The protrusion amount of the intersection (appropriately referred to as a GG cross section as appropriate) is h _2a . _{Incidentally,} etc. _{h 1a} and _{h 2a} are not shown, it corresponds to the same manner as such the the _{h 1} and _{h 2.}
The axial portion 21a has two inclined surfaces 211a, and the length in the inclined direction of the inclined surface 211a of the FF cross section (that is, the inclined surface 211a and the panel portion 3a from the ridge line of the axial portion 21a). The length in the axial direction of the can body 11a up to the line of intersection with the flat surface is L _1a . Furthermore, the inclination angle of the inclined surface 211a with respect to the virtual extension plane 30 is α _1a .
On the other hand, the length in the inclination direction of the GG cross section of the axial portion 21a (i.e., from the ridge line of the axial portion 21a to the intersection line where the inclined surface 211a and the flat surface of the panel portion 3a intersect, The length along the axis of the can body 11a) is _L2a . Furthermore, the inclination angle of the inclined surface 211a with respect to the virtual extension plane 30 is α _2a .

The relationship between the dimensions is h _1a <h _2a , L _1a <L _2a , α _2a <α _1a , and thus each axial portion 21 a has a pair of inclined surfaces 211 a that are twisted. When the projection amount of the frame portion 2a from the virtual extension plane 30 (in this application example, the axial direction portion 21a) increases, the inclined surface 211a becomes longer according to the projection amount. Thereby, in the intersection part (GG cross-section part) of the axial direction part 21a and the circumferential direction part 22a and its vicinity, the stress concentration at the time of shaping | molding is avoided, and the malfunction of damaging the can body 11a can be avoided. it can.

  Further, the circumferential portion 22a of the frame portion 2a protrudes outward from a virtual extension plane 30 that extends the panel portion 3a. Each circumferential portion 22a has a pair of flat or substantially flat inclined surfaces 221a, and the circumferential shape of the circumferential portion 22a is a mountain shape (a shape composed of two sides of an isosceles triangle).

Further, as indicated by broken lines in FIG. 6, each ridgeline of the frame portion 2a is linear or substantially linear. In this way, the frame portion 2a acts as a strong beam, and it can be axially or radially applied to the can body by impact during transportation, decompression after filling and sterilization of contents, or increase in internal pressure of the can during sterilization. Even if a direction deformation force acts, mechanical strength such as buckling resistance or resistance to deformation in the radial direction can be improved.
Moreover, although the radial direction position of the intersection of each ridgeline of the frame part 2a is normally the same as the outer diameter of the can body 11a, it is not limited to this. For example, it may be located inside the outer diameter of the can body 11a or may be located outside.

(Panel part)
The panel portion 3a is surrounded by the axial portion 21a and the circumferential portion 22a of the frame portion 2a, and has a flat surface. In this application example, the surface of each panel portion 3a is a flat surface or almost all of it is a flat surface. Thereby, the shape of the panel part 3a and the frame part 2a can be formed accurately and accurately, and the rib function of the frame part 2a can be strengthened.
Moreover, since the panel part 3a is connected to the axial part 21a which consists of the said inclined surface 211a, while the stress concentration at the time of pressure reduction to the panel part 3a is relieved, at the time of the raise of the can internal pressure at the time of retort sterilization Excessive bulging or partial deformation is prevented, and the mechanical strength of the can body can be improved.

Here, the shape of the flat surface of the panel portion 3a is not similar to the shape of the ridgeline of the frame portion 2a. That is, in this application example, the shape of the flat surface of the panel portion 3a corresponds to the shape of the frame portion 2a described above, as shown in FIG. And the length W _0a and the length W _1a have a relationship of 0.5 ≦ W _1a / W _0a ≦ 0.8, and are formed in the axial portion 21a of the frame portion 2a described above. The inclined surface 211a has a hexagonal shape that is not similar to the ridgeline shape of the frame portion 2a. Even in this case, the double honeycomb structure hexagonal shape of the frame portion 2a and the panel portion 3a is combined, and the mechanical strength of the can body can be further improved.

  As described above, the can body of the application example 1 can achieve the same effects as those of the above-described embodiment, can further provide a unique stereoscopic effect and aesthetics, and can improve the commercial value and the like. .

<Application example 2 of can body>
FIG. 7: has shown the schematic enlarged view of the can of the application example 2 of this invention.
In FIG. 7, the can body of this application example is different from the can body 1 in that a triangular frame portion 2 b is provided instead of the frame portion 2.
The other configuration is substantially the same as that of the can body 1, and the same components as those of the can body of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

(Frame part)
The frame portion 2b of the can body of this application example is disposed on the entire circumference of the can body 11b. That is, the frame portion 2b is provided along two axially inclined portions 21b (portions corresponding to the hypotenuses of the triangle) that are disposed to be inclined in the axial direction of the can body 11b, and along the circumferential direction of the can body 11b. When viewed from the side of the can body 11b, the top of the frame portion 2b in the shape of an isosceles triangle with respect to the circumferential portion 22b (bottom) of the frame portion 2b has a circumferential portion 22b (a portion corresponding to the bottom of the triangle). The inner surface of the corner portion is curved. In the present embodiment, the ridge line shape of the frame portion 2b is an isosceles triangle.

  Further, the plurality of frame parts 2b are arranged without gaps on the entire circumference of the can body 11b (with the adjacent frame parts 2b sharing the axially inclined part 21b and the circumferential part 22b). Thereby, the frame part 2b functions as a rib, and the mechanical strength of a can can be improved.

Although not shown, the frame portion 2b (the axially inclined portion 21b and the circumferential portion 22b) protrudes outward from a virtual extension plane 30 that extends a flat surface of a panel portion 3b described later.
Here, the protrusion amount of the ridge line point P _2b (appropriately abbreviated as HH cross-section) of the axially inclined portion 21b is h _1b , and the intersection where the ridgelines of the two axially inclined portions 21b intersect. The protruding amount of the point P _1b (appropriately abbreviated as II cross section) is h _2b .
The axially inclined portion 21b, has two inclined surfaces 211b, the H-H direction of inclination of the length of the inclined surface 211b of the cross section (i.e., the point _{P 2b} ridge axial inclined portion 21b, inclined The length in the axial direction of the can body 11b up to the intersecting line where the surface 211b and the flat surface of the panel portion 3b intersect is L _1b . Further, the inclination angle of the inclined surface 211b with respect to the virtual extension plane 30 is alpha _1b.
In contrast, axially inclined portion 21b I-I cross section inclined direction of length of (i.e., from the point P _1b ridge line of two axially inclined portion 21b intersect the flat surface of the inclined surface 211b and the panel portion 3b The length in the axial direction of the can body 11b up to the intersection line intersecting with is L _2b . Furthermore, the inclination angle of the inclined surface 211b with respect to the virtual extension plane 30 is α _2b .

The relationship among the above dimensions is h _1b <h _2b , L _1b <L _2b , α _2b <α _1b , whereby each axially inclined portion 21 b has a pair of inclined surfaces 211 b that are twisted. When the projection amount of the frame portion 2b (in this application example, the axially inclined portion 21b) from the virtual extension plane 30 increases, the inclined surface 211b becomes longer according to the projection amount. Thereby, in the intersection part (II cross-sectional part) of the two axial direction inclination parts 21b and its vicinity, the stress concentration at the time of shaping | molding can be avoided and the malfunction of damaging the can body 11b can be avoided.

  Further, the circumferential portion 22b of the frame portion 2b protrudes outward from the virtual extension plane 30 that extends the panel portion 3b. Each circumferential portion 22b has a pair of flat or substantially flat inclined surfaces 221b, and the circumferential portion 22b has a mountain shape (a shape composed of two sides of an isosceles triangle).

Further, as indicated by the broken lines in FIG. 7, each ridgeline of the frame portion 2b is linear or substantially linear. In this way, the frame portion 2b acts as a strong beam, and the axial direction or diameter of the can body due to impact during transportation, decompression after filling and sterilization of contents, or increase in internal pressure during sterilization, etc. Even if a direction deformation force acts, mechanical strength such as buckling resistance or resistance to deformation in the radial direction can be improved.
Moreover, although the radial direction position of the intersection of each ridgeline of the frame part 2b is normally the same as the outer diameter of the can body 11b, it is not limited to this. For example, it may be located inside the outer diameter of the can body 11b or may be located outside. The radial positions of the points P _1b and P _5b are usually the same as the outer diameter of the can body 11b, and the radial positions of the points P _2b , P _3b and P _4b are the outer diameter of the can body 11c. It is located more inside.

(Panel part)
The panel portion 3b is surrounded by the axially inclined portion 21b and the circumferential portion 22b of the frame portion 2b, and has a flat surface. In this application example, the surface of each panel portion 3b is a flat surface or almost all of it is a flat surface. Thereby, the shape of the panel part 3b and the frame part 2b can be formed accurately and accurately, and the rib function of the frame part 2b can be strengthened.
Further, since the panel portion 3b is connected to the axially inclined portion 21b formed of the inclined surface 211b, stress concentration during pressure reduction on the panel portion 3b is alleviated, and when the internal pressure of the can during the retort sterilization increases Excessive swelling or partial deformation of the can is prevented, and the mechanical strength of the can body can be improved.

Here, the shape of the flat surface of the panel portion 3b is not similar to the shape of the ridgeline of the frame portion 2b. That is, in this application example, the shape of the flat surface of the panel portion 3b is rounded to an arc shape with respect to the base of the isosceles triangle shape as shown in FIG. 7 corresponding to the shape of the frame portion 2b described above. It has been. In the panel portion 3b, when the panel portion 3b is assumed to be an isosceles triangle, the length W _{0b in} the height direction and the length W _1b in the height direction of the panel portion 3b are 0.5 ≦ W. The relationship is _1b / W _0b ≦ 0.8, and the ridgeline shape of the frame portion 2b is not similar to the ridgeline shape of the frame portion 2b due to the inclined surface 211b formed on the axially inclined portion 21b of the frame portion 2b. Even if it does in this way, the double triangular shape of the frame part 2b and the panel part 3b couple | bonds together, and the mechanical strength of the said can can be improved.
In this application example, the flat surface of the panel portion 3b has a shape in which the corners of the hypotenuses are rounded into an arc shape, but the radius of curvature of the arc is not particularly limited. For example, the flat surface of the panel portion 3b may be triangular or semicircular.

  As described above, the can body of the application example 2 can achieve the same effects as those of the above-described embodiment, can further provide a unique stereoscopic effect and aesthetics, and can improve the commercial value and the like. .

<Application example 3 of can body>
FIG. 8: has shown the schematic enlarged view of the can of the application example 3 of this invention.
In FIG. 8, the can body of this application example is different from the can body 1 in that a square frame portion 2 c is provided instead of the frame portion 2.
The other configuration is substantially the same as that of the can body 1, and the same components as those of the can body of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

(Frame part)
The frame portion 2c of the can body of this application example is disposed on the entire circumference of the can body 11c. That is, the frame portion 2c includes two axial portions 21c disposed along the axial center direction of the can body 11c and two circumferential portions 22c disposed along the circumferential direction of the can body 11c. When viewed from the side of the can body 11c, the two circumferential portions 22c of the frame portion 2c are symmetrically curved inwardly (in the center of the square). In the present embodiment, the ridge line shape of the frame portion 2c is a square shape.
Further, the plurality of frame portions 2c are arranged without gaps on the entire circumference of the can body 11c (with the adjacent frame portions 2c sharing the axial portion 21c and the circumferential portion 22c). In addition, the axial portion 21c of the frame portion 2c adjacent in the vertical direction is positioned at the center (point P _3c ) of the circumferential portion 22c. Thereby, the frame part 2c functions as a rib, and can improve the mechanical strength of a can.

Although not shown, the frame portion 2c (the axial portion 21c and the circumferential portion 22c) protrudes outward from a virtual extension plane 30 that extends a flat surface of a panel portion 3c described later.
Moreover, the axial direction part 21c of the frame part 2c protrudes outside the virtual extension plane 30 which extended the panel part 3c. Each axial portion 21c has a pair of flat or substantially flat inclined surfaces 211c, and the cross-sectional shape of the axial portion 21c is a mountain shape (a shape composed of two sides of an isosceles triangle).

Further, substantially the amount of projection of the intermediate (suitably, abbreviated as J-J cross section.) Of the circumferential portions point _{P 2c} of 22c ridge and the point _{P 3c is h 1c,} ridges of the circumferential portion 22c and the shaft The protrusion amount of the intersection (where appropriate abbreviated as KK cross section) where the ridge lines of the direction portion 21c intersect is h _2c .
The circumferential portion 22c has an inclined surface 221c, and the length in the inclined direction of the inclined surface 221c of the JJ cross section (that is, the flat surface of the inclined surface 221c and the panel portion 3c from the ridge line of the circumferential portion 22c). to intersection line plane and intersect, axial length of the can body 11c) are L _1c. Furthermore, the inclination angle of the inclined surface 221c with respect to the virtual extension plane 30 is α _1c .
In contrast, the length in the inclined direction of the KK cross section of the circumferential portion 221c (i.e., from the ridgeline of the circumferential portion 22c to the intersecting line where the inclined surface 221c and the flat surface of the panel portion 3c intersect) The length of the can body 11c in the axial direction) is _L2c . Furthermore, the inclination angle of the inclined surface 221c with respect to the virtual extension plane 30 is α _2c .

Here, the relationship between the above dimensions is h _1c <h _2c , L _1c <L _2c , α _2c <α _1c , and thus each circumferential portion 22 c has a twisted inclined surface 221 c. If the projection amount of the frame portion 2c (the circumferential portion 22c in this application example) from the virtual extension plane 30 increases, the inclined surface 221c becomes longer according to the projection amount. Thereby, the stress concentration at the time of shaping | molding can be avoided in the intersection part (point _P3c ) of the axial direction part 21c and the circumferential direction part 22c, and its vicinity, and the malfunction of damaging the can body 11c can be avoided.

Further, as indicated by broken lines in FIG. 8, each ridgeline of the frame portion 2c is linear or substantially linear. However, the ridge line of the axial portion 21c is a single straight line, ridge line of the circumferential portion 22c, when viewed from the axial direction, each point _{P 1c,} P _3c, are bent at _{P 5c,} 2 present It consists of a straight line. In this way, the frame portion 2c acts as a strong beam, and it can be axially or radially applied to the can body by impact during transportation, decompression after filling and sterilization of contents, or increase in internal pressure of the can during sterilization. Even if a direction deformation force acts, mechanical strength such as buckling resistance or resistance to deformation in the radial direction can be improved.
Moreover, although the radial direction position of the intersection of each ridgeline of the frame part 2c is normally the same as the outer diameter of the can body 11c, it is not limited to this. For example, it may be located inside the outer diameter of the can body 11c or may be located outside. The radial positions of the points P _1c , P _3c , and P _5c are usually the same as the outer diameter of the can body 11c, and the radial positions of the points P _2c and P _4c are the outer diameter of the can body 11c. It is located more inside.

(Panel part)
The panel portion 3c is surrounded by the axial portion 21c and the circumferential portion 22c of the frame portion 2c, and has a flat surface. In this application example, the surface of each panel portion 3c is a flat surface or almost all of it is a flat surface. Thereby, the shape of the panel part 3c and the frame part 2c can be formed accurately and accurately, and the rib function of the frame part 2c can be strengthened.
Further, since the panel portion 3c is connected to the circumferential portion 22c composed of the inclined surface 221c, the stress concentration at the time of depressurization to the panel portion 3c is alleviated, and at the time of increasing the internal pressure of the can during retort sterilization Excessive bulging or partial deformation is prevented, and the mechanical strength of the can body can be improved.

Here, the shape of the flat surface of the panel portion 3c is a non-similar shape to the shape of the ridgeline of the frame portion 2c. That is, in this application example, the ridgeline shape of the frame portion 2c is square, whereas the shape of the flat surface of the panel portion 3c corresponds to the shape of the frame portion 2c described above, as shown in FIG. The upper side and the lower side are symmetrically curved inward, and the height direction length W _0c of the side side of the panel portion 3c and the height direction length W _{1c of the} central portion are 0.5 ≦ W _1c. / W _0c ≦ 0.8, the axial length passing through the center of the flat surface is shortened, and the frame portion 2c is formed by the inclined surface 221c formed on the circumferential portion 22c of the frame portion 2c described above. The shape of the ridge line is not similar.
As described above, the double square structure of the frame portion 2c and the panel portion 3c is combined to further improve the mechanical strength of the can body, and the can body of the application example 3 is the same as the above embodiment. In addition, it is possible to provide a unique stereoscopic effect and aesthetics, and to improve the product value.

[Embodiment of can body forming tool]
FIG. 9: has shown the schematic perspective view of the inner roller of the shaping | molding tool of the can body concerning embodiment of this invention.
FIG. 10 is a schematic perspective view of the outer roller of the can forming tool according to the embodiment of the present invention.
Moreover, FIG. 11 has shown the process schematic by the shaping tool concerning embodiment of this invention.
9 and 10, the can forming tool of the present embodiment includes an inner roller 4 and an outer roller 5. For example, the can forming tool is attached to the peripheral polyhedral wall can manufacturing apparatus of Patent Document 4 described above. The can 1 can be formed.
That is, the forming tool of this embodiment forms the frame part 2 and the panel part 3 on the side wall of the can body 11 sandwiched between the inner roller 4 and the outer roller 5 by rotating the inner roller 4 and the outer roller 5 synchronously.
In addition, although the shaping | molding tool of this invention can be applied to the can shown to FIG. 1, FIG. 6 thru | or 8 mentioned above, this embodiment demonstrates the shaping | molding tool applied to the can 1 shown in FIG. .

(Innerola)
In the present embodiment, the inner roller 4 is a cylindrical body into which a rotation shaft (not shown) is inserted, and the outer peripheral surfaces thereof are the axial portion 21 and the circumferential portion 22 of the frame portion 2 of the can body 1. And a polygonal shape corresponding to the panel part 3 (see FIG. 1), and has a frame part forming convex part 41 and a panel part forming concave part 42 on the outer peripheral surface.
The convex part 41 for forming the frame part has a hexagonal shape, and is for molding the frame part 2 of the can 1. Moreover, the recessed part 42 for panel part formation is also hexagonal shape, and is for shape | molding the panel part 3 of the can 1.

Further, the ridge line 421 is formed in the center along the axial direction (the direction of the rotation axis), and the panel part forming concave part 42 is formed via the frame part forming convex part 41 with the ridge line 421 as a center line. The two panel portion forming recesses 42 are formed to have the same depth.
When the inner roller 4 and an outer roller 5 to be described later form the panel portion 3 of the can body 1 by the ridge line 421, the pushing amount of the panel portion 3 is regulated. As a result, the projecting molding of the frame part 2 and the molding with the uniform depth of the panel part 3 are carried out, and the molding in the panel part 3 can be prevented and stable molding can be performed, thereby improving the molding accuracy. Yes (see FIG. 11).
The corners of the frame portion forming convex portion 41 and the panel portion forming concave portion 42 are processed so as to be gently curved so as not to damage the coating film on the inner surface of the can body 11. .

(Outerola)
The outer roller 5 has a cam shape including a large-diameter portion that meshes with the inner roller 4 and a small-diameter portion that does not mesh with the inner roller 4 in the radial cross-sectional shape, and the panel portion forming convex portion 51 is formed on the entire outer peripheral surface of the large-diameter portion. And a recess 52 for forming a frame portion.
The frame portion forming concave portion 52 and the panel portion forming convex portion 51 are hexagonal shapes that are curved in the circumferential direction respectively corresponding to the frame portion forming convex portion 41 and the panel portion forming concave portion 42 of the inner roller 4. The frame part 2 and the panel part 3 are formed.
The corners of the panel forming convex portion 51 and the frame forming concave portion 52 are processed so as to be gently curved so as not to damage the printed film on the outer surface of the can body 11.

  As described above, according to the can body forming tool of the present embodiment, the outer roller 5 is prevented from being excessively pushed by the ridge line 421 provided in the panel portion forming recess 42 of the inner roller 4. Damage to the broken body and inner surface coating in the panel portion 3 at the time of molding can be prevented and stable molding can be performed, and molding accuracy can be improved.

As mentioned above, although the preferable embodiment etc. were shown and explained about the can of the present invention and the can forming tool, the can and the can forming tool concerning the present invention are limited to the above-mentioned embodiment etc. However, it goes without saying that various modifications can be made within the scope of the present invention.
For example, the shape of the frame portion of the can body is not limited to the above shape, and may be another polygonal shape or a circular shape. Even if it does in this way, there can exist an effect similar to can 1.

1 Can body 2, 2a, 2b, 2c Frame part
3, 3a, 3b, 3c Panel section
4 Innerola
5 outer roller
11, 11a, 11b, 11c Can body
12 Lid
21, 21a, 21c Axial portion
21b Axial inclined part
22, 22a, 22b, 22c Circumferential portion
30 Virtual extension plane
41 Projection for forming frame
42 Recess for forming panel
51 Panel portion forming convex portion 52 Frame portion forming concave portions 211, 211a, 211b, 211c Inclined surfaces 221, 221a, 221b, 221c Inclined surfaces 421 Ridge lines

Claims (6)

A frame portion disposed on the can body and having an inclined surface;
A panel portion surrounded by the frame portion and having a flat surface,
The frame portion protrudes from a virtual extension plane extending the panel portion, and when the projection amount of the frame portion from the virtual extension plane increases, a portion where the inclined surface becomes longer according to the projection amount. Yes, and
Can body characterized that you have twisted inclined surface having the longer portion.   The can according to claim 1, wherein a ridge line of the frame portion is a polygonal shape.   The can according to claim 2, wherein the polygonal shape is a hexagonal shape. The shape of the flat surface of the said panel part is a non-similar shape with respect to the ridgeline shape of the said frame part, The can body in any one of the Claims 1 thru | or 3 characterized by the above-mentioned. The can forming tool according to any one of claims 1 to 4 ,
A polygonal inner roller having a convex part for forming a frame part and a concave part for forming a panel part on the outer peripheral surface, and having a ridge line at the center of the concave part for forming a panel part;
A frame portion forming convex portion and a panel portion forming concave portion curved in the circumferential direction corresponding to the frame portion forming convex portion and the panel portion forming concave portion of the inner roller, respectively, and an outer roller having an outer peripheral surface formed thereon. A can body forming tool. The can forming tool according to claim 5 , wherein a ridge line is formed along the axial direction in the recess for forming the panel portion.