JP5072971B2 - Square shape can - Google Patents

Description

  The present invention relates to a square can such as a so-called 18 liter can, and more particularly to a square can having a reinforcing bead extending in a longitudinal direction at a corner portion.

In a rectangular can such as a so-called 18 liter can, it has been proposed to form a longitudinal reinforcing bead on a cylindrical body portion in order to improve durability against a longitudinal load (for example, Patent Document 1 and Patent). Reference 2). In such a rectangular can, a reinforcing bead extending in the vertical direction and projecting inward is formed on both sides of the apex (such as a mating portion) at each corner of the body. Yes. By forming reinforcing beads at each corner portion of the trunk portion in this way, durability against a longitudinal load at each corner portion is increased. For example, multi-layered rectangular cans are displaced due to collapse of the corners and the like. Even if an uneven load is applied to the part, deformation and buckling at the corner part can be prevented.
Japanese Utility Model Publication No. 52-142033 Japanese Patent Publication No.52-43154

  By the way, in such a square can, it is desired from the viewpoint of cost reduction and weight reduction to make the steel plate used as the material thinner. Since thinning the steel plate in this way adversely affects the durability of the rectangular can, how to form a reinforcing bead for reinforcing the trunk is an important issue.

  The present invention has been made in view of such circumstances, so that even if the metal plate material such as a steel plate as a material is made thinner, it is possible to obtain a desired durability against an uneven load or the like particularly in a corner portion. Provided is a rectangular can.

The rectangular can according to the present invention is formed by joining both ends of a rectangular metal plate material and joining the two sides, and opening the body part that is a substantially rectangular tube formed so that the joined part becomes a corner part. A square can formed by joining end plates to both ends, and extending from each of the ends on the top of each corner portion excluding the corner portion where the joining portion of the trunk portion is located, and outwardly a pair vertical reinforcing convex bead that protrudes is formed configuration.

With such a configuration, on the top of each corner except for the corner portion with a joining portion of the barrel, it is reinforced by vertical reinforcing convex bead one pair formed to extend from both ends of the body portion At the same time, the corner portion having the joint portion is reinforced by the overlap of the metal plate materials in the joint portion.

The shape including the width and length of each longitudinal reinforcing convex bead can be determined to be optimal according to the size of the rectangular can, the assumed load, the impact, the physical properties of the material, its thickness, and the like .

  Further, in the rectangular can according to the present invention in which a pair of longitudinal reinforcing convex beads are formed in each corner portion except for the corner portion where the joint portion of the trunk portion is provided, it continues on both sides of each corner portion in the trunk portion. A longitudinal reinforcing bead extending from a joint portion with one end plate to a joint portion with the other end plate may be formed at a boundary portion with the corner portion of the side wall surface.

  With such a configuration, it is possible to further ensure sufficient durability against the uneven load at the adjacent portion of each corner portion. Accordingly, it is possible to effectively prevent each corner from being deformed or buckled abruptly with deformation in the vicinity thereof.

According to the angular shape can in accordance with the present invention, on top of each corner except for the corner portion with a joining portion of the body portion, the longitudinal reinforcing protruding one pair formed to extend from both ends of the body portion In addition to being reinforced by the bead, the corner portion with the joint portion is reinforced by the overlap of the metal plate material at the joint portion, so even if the metal plate material as the material is made thinner, especially in the corner portion Desirable durability against the uneven load can be obtained.

It is the top view (a) and front view (b) which were seen from the square-shaped can which concerns on the 1st Embodiment of this invention. It is a perspective view of the square shaped can which concerns on the 1st Embodiment of this invention. It is a figure which shows the manufacturing procedure (a), (b), (c) of the trunk | drum of a square-shaped can. They are AA partial sectional drawing (a) in FIG.1 (b), and BB partial sectional drawing (b). It is sectional drawing which shows the metal mold mechanism of the press apparatus which manufactures a trunk | drum. It is sectional drawing which shows the state which is press-molding the trunk | drum by the metal mold | die mechanism shown in FIG. It is the perspective view (a) of the square shaped can which concerns on the 2nd Embodiment of this invention, and sectional drawing (b) of a corner part. It is a figure which shows the evaluation result about the durability with respect to the eccentric load and impact load in the corner part of a square-shaped can. It is the perspective view (a) which shows the structure of the square can as a comparative example, and sectional drawing (b) of the corner part. It is the top view (a) and front view (b) which were seen from the square-shaped can which concerns on the 3rd Embodiment of this invention. It is a perspective view of the square-shaped can which concerns on the 3rd Embodiment of this invention. It is a figure which shows the manufacture procedure (a) and (b) of the trunk | drum of a square-shaped can. It is a perspective view which shows the square-shaped cylinder used as the origin of the trunk | drum of a square-shaped can. FIG. 14 is an enlarged detail view of a region Ec in FIG. 13. It is CC sectional view taken on the line in FIG.10 (b). It is sectional drawing which shows a part of die mechanism of the press apparatus which shape | molds the corner part which has a side seam part (joint part part) in a trunk | drum. It is sectional drawing which shows the state which is press-molding the trunk | drum by the part of the metal mold mechanism shown in FIG. It is the perspective view (a) of the square shaped can which concerns on the 4th Embodiment of this invention, and sectional drawing (b) of a corner part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Body part 12 Vertical reinforcement bead 14 Lateral reinforcement bead 15a, 15b Vertical reinforcement convex bead 15a1, 15a2, 15b1, 15b2 Vertical reinforcement convex bead 16 Rectangular reinforcement part 18a, 18b, 18c, 18d Corner part 18top Top part 20a Top plate (end plate) )
20b Bottom plate (end plate)
110 Cylindrical body 120, 130 Tubular body 201 Corner space 210, 220 Outer mold 211, 221 Protruding section 230, 240 Inner mold 231, 241 Concavity 250, 270 Corner outer mold 251 Concavity 271 Concave curved surface 260, 280 In corner Mold

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The square can according to the first embodiment of the present invention is configured as shown in FIGS. 1 and 2, for example. FIG. 1 is a plan view (a) and a front view (b) of the rectangular can according to the first embodiment of the present invention as viewed from above, and FIG. 2 is a perspective view of the rectangular can. It is.

  1 and 2, this rectangular can (so-called 18 liter can) is formed of a steel plate having a predetermined thickness, and a top plate 20a (end plate) is provided at the upper end of the body portion 10 which is a substantially rectangular cylindrical body. The bottom plate 20b (end plate) is bonded and fixed to the lower end thereof by winding and tightening. On each side wall surface of the body portion 10, two vertical reinforcing beads 12, two horizontal reinforcing beads 14, and a rectangular reinforcing portion 16 (commonly called a frame) are formed by pressing. The rectangular reinforcing portion 16 is positioned at a substantially central portion of each side wall surface of the trunk portion 10, and the two lateral reinforcing beads 14 are positioned above and below the rectangular reinforcing portion 16. Each vertical reinforcing bead 12 is connected to the bottom plate 20b from the joint portion with the top plate 20a at the boundary portion with the corner portion of the side wall surface following each side of each of the corner portions 18a, 18b, 18b, 18c of the trunk portion 10. It is formed so that it may extend to the joining part.

  A method for manufacturing the body portion 10 of the rectangular can will be briefly described.

  A rectangular metal plate member (steel plate) 100 as shown in FIG. 3 (a) is formed into a cylindrical shape as shown in FIG. 3 (b), for example, and both end portions thereof are overlapped. A circular cylindrical body (cylindrical body) 110 is formed by joining the overlapping end portions by welding. Next, the cylindrical body 11 is formed into a substantially quadrangular cylindrical body 120 by pressing as shown in FIG. The cylindrical body is formed so that the welded joint portion (referred to as a side seam portion) 19 of the metal plate member 100 does not come into any corner portion of the substantially rectangular shape when the substantially rectangular cylindrical body 120 is formed. Positioning to 110 press machines is performed. Further, as shown in FIG. 4A (A-A cross-sectional view in FIG. 1B), each vertical reinforcing bead 12 has a concave shape that is recessed inward from the outside of the body portion 10, and the rectangular reinforcing portion 16. Has a shape in which the edge is relatively raised from the inside. Although not shown in the drawing, each lateral reinforcing bead 14 has a convex shape that protrudes from the inside of the body portion 10 to the outside.

  Further, a vertical reinforcing bead 15a is formed on the top portion 18top extending in the vertical direction of each of the corner portions 18a, 18b, 18c, and 18d so as to extend from the end portion on the top plate 20a side. A longitudinal reinforcing bead 15b is formed so as to extend from the end on the 20b side. As shown in FIG. 4B (a cross-sectional view taken along line B-B in FIG. 1B), the pair of longitudinal reinforcing beads 15 a and 15 b has a convex shape that protrudes from the inside of the body portion 10 to the outside. Yes. Hereinafter, in order to distinguish these longitudinal reinforcing beads 15a and 15b from the pair from the longitudinal reinforcing beads 12, they are referred to as longitudinal reinforcing convex beads 15a and 15b.

  The width and length of each vertical reinforcing convex bead 15a, 15b are determined so that desired durability can be obtained with respect to the offset load and the impact load at each corner 18a, 18b, 18c, 18d.

  The body 10 having the above-described structure is manufactured by, for example, a press apparatus having a mold mechanism shown in FIGS. 5 and 6 show a portion obtained by dividing the entire mold mechanism into quarters, but the other divided portions have the same configuration.

  In FIG. 5, outer molds 210 and 220 with the press surface facing inward are arranged outside the inner dies 230 and 240 with the press surface facing outward. On the pressing surfaces of the inner dies 230 and 240, concave portions 231 and 241 for forming the longitudinal reinforcing beads 12 (see FIGS. 1, 2 and 4) and concave and convex portions for forming the beads (not shown). Are formed on the pressing surfaces of the outer molds 210 and 220 corresponding to the concave portions 231 and 241 and the inner molds 230 and 240 corresponding to the concave and convex portions. (Not shown) is formed. A corner space 201 is formed at the opposite corner portions of the inner molds 230 and 240 that are arranged at right angles so that the ends face each other, and the corner inner mold 260 is disposed in the corner space 201. ing. The outer tip of the corner inner mold 260 is a curved press surface. Further, an outer corner mold 250 is disposed outside the inner corner mold 260 with the press surface facing inward. A recess 251 is formed on the pressing surface of the corner outer mold 250 so as to face the outer tip portion of the corner inner mold 260.

  The inner molds 230 and 240, the outer molds 210 and 220, the corner inner mold 260 and the corner outer mold 250 are clamped and opened by a hydraulic expander mechanism. At the time of clamping, the inner dies 230 and 240 move outward, the corner inner dies 260 move obliquely outward, the outer dies 210 and 220 move inward, and the corner outer dies 250 obliquely move. Move inward each. When the mold is opened, the inner molds 230 and 240 are moved inward and the corner inner mold 260 is moved obliquely inward, and the outer molds 210 and 220 are moved outward and the corner outer mold 250 is moved. Move diagonally outward.

  In such a mold mechanism, a steel plate cylinder 120 (see FIG. 3), which is the original form of the body portion 10, is set between the inner molds 230 and 240 and the outer molds 210 and 220. In this state, first, the inner molds 230 and 240 move outward. As a result, when the corner space 201 is expanded, the inner mold 260 moves outward, the outer corner mold 250 moves inward, and the inner mold 260 and the outer corner mold 250 are molded. Tighten up. Accordingly, as shown in FIG. 6, the top of the corner portion of the cylindrical body 120 (body portion 10) is formed by the outer front end portion of the inner corner mold 260 and the press surface on which the concave portion 251 of the outer corner mold 250 is formed. Are formed, and longitudinal reinforcing convex beads 15a and 15b are formed on the top of the corner portion so as to match the concave portion 251 of the corner outer mold 250.

  Thereafter, the outer molds 210 and 220 move inward, and the inner molds 230 and 240 and the outer molds 210 and 220 are clamped. Thereby, as shown in FIG. 6, the cylindrical body 120 is molded so as to have a regular outer shape (substantially square shape) as the body portion 10, and the inner molds 230 and 240 and the outer molds 210 are formed. , 220 are formed on the press surfaces of the inner molds 230 and 240 (for example, the recesses 231 and 241) and the uneven shapes formed on the press surfaces of the outer molds 210 and 230. Various reinforcing beads (for example, vertical reinforcing beads 12) that match (for example, the convex portions 211 and 221) are formed.

  When molding is completed, the molds in the corner inner mold 260 and the corner outer mold 250 are opened, and then the molds in the inner molds 230 and 240 and the outer molds 210 and 220 are opened. And it becomes a regular external shape as the trunk | drum 10 of a square-shaped can, and the cylinder 120 (torso part 10) in which various reinforcement beads (refer FIG.1, FIG.2 and FIG.4) were formed is each inner metal mold | die 230. FIG. , 240 and each outer mold 210, 220.

  In the press work described above, the inner molds 260 and 240 and the outer molds 210 and 220 are clamped after the inner mold 260 and the outer corner mold 250 are clamped. However, the order of mold clamping is reversed, that is, after the inner molds 230 and 240 and the outer molds 210 and 220 are clamped, the inner mold 260 and the outer corner mold 250 are clamped. It may be made.

  The square can according to the second embodiment of the present invention is configured as shown in FIG. The rectangular can according to the second embodiment is the same as that shown in FIGS. 1 to 3, except that the number and the position of the longitudinal reinforcing convex beads formed at the corner portions 18a, 18b, 18c, and 18d are different. This is the same as the rectangular can according to the first embodiment shown in FIG.

  7A and 7B, each of the corner portions 18a, 18b, 18c, and 18d is joined along the top portion 18top and extended from the end portion on the top plate 20a side. The beads 15a1 and 15a2 are formed, and two longitudinal reinforcing convex beads 15b1 and 15b2 are formed so as to extend from the end on the bottom plate 20b side as a pair. Thereby, each of corner part 18a, 18b, 18c, 18d will be reinforced by two pairs (2 rows) of longitudinal reinforcement convex beads 15a1, 15b1, and 15a2, 15b2. The shape including the width and length of each vertical reinforcing convex bead 15a1, 15b1, 15a2, 15b2 is such that desired durability can be obtained with respect to uneven load and impact load at each corner 18a, 18b, 18c, 18d. It is decided. In addition, as shown in FIG. 7B, by arranging the arrangement pitch P1 of the longitudinal reinforcing convex beads 15a1 and 15a2 (15b1 and 15b2) in parallel with the width of the longitudinal reinforcing convex beads, the longitudinal reinforcing convex parallel to each other is arranged. The beads 15a1 and 15a2 (15b1 and 15b2) are joined along the top 18top.

(Strength test result)
FIG. 8 shows the result of the strength test on the square can (NO. 1) according to the first embodiment of the present invention and the square can (NO. 3) according to the second embodiment of the present invention. Are shown together with comparative examples (NO.2, NO.4 to NO.6). The width | variety of the vertical reinforcement convex bead in each square-shaped can which concerns on embodiment of this invention was 8 mm, and length was set to 50 mm.

  Referring to FIG. 8, the rectangular can (NO. 1) according to the first embodiment of the present invention is most preferable in terms of durability against the uneven load and the impact load. This is presumably because the corner portions 18a, 18b, 18c, and 18d are reinforced by the pair of longitudinal reinforcing convex beads 15a and 15b. On the other hand, a longitudinal reinforcing convex bead (width: 8 mm) is provided on the top portion 18a of the corner portion 18 so as to extend (through) the entire longitudinal direction of the body portion 10 from the end portion on the top plate 20a side to the end portion on the bottom plate 20b side. Even if formed, good results were not obtained with respect to durability against uneven load (see NO. 2). In addition, the square can (NO. 3) according to the second embodiment of the present invention obtained particularly good results with respect to durability against impact load. As shown in FIGS. 9A and 9B, each of the corner portions 18a, 18b, 18c, and 18d has two rows (two pairs) of longitudinal reinforcing projections separated from each other across the top portion 18top. The square can (NO.4) in which the beads 15a1, 15b1 and 15a2, 15b2 (width: 8 mm, length: 50 mm, pitch P2: 24 mm) are formed has particularly good results regarding at least durability against uneven loads. I couldn't.

  Furthermore, instead of the longitudinal reinforcing convex beads 15a and 15b (see FIGS. 1, 2 and 4), concave reinforcing beads (width: 8 mm, length: 50 mm) recessed inward from the outside of the trunk portion 10 are used. When formed (NO. 6), such a concave reinforcing bead (width: 8 mm) is passed through the entire length of the body 10 from the end on the top plate 20a side to the end on the bottom plate 20b side (through). In the case where the corner portions 18a, 18b, 18c, and 18d are formed on the top portions 18top so as to extend (NO.5), good results with respect to the durability against the uneven load and the impact load could not be obtained. This is presumed that in the case of a concave reinforcing bead, when the longitudinal load is applied, the corner portion 18 cannot effectively prevent the internal folding.

  As described above, the pair of longitudinal reinforcing convex beads 15a formed on the top portions 18top of the corner portions 18a, 18b, 18c, and 18d so as to extend from the end portions on the top plate 20a side and the end portions on the bottom plate 20b side, respectively. 15b, the corner can 18 is reinforced with the corner 18 (first embodiment, strength test result No. 1), even if the steel plate as a material is made thinner, the corners 18a, 18b, 18c , 18d, it is possible to obtain desired durability against uneven load and impact load. Further, two longitudinal reinforcing convex beads 15a1 and 15a2 are formed so as to be joined along the top portions 18top of the corner portions 18a, 18b, 18c, and 18d and extend from the end portion on the top plate 20a side. According to the rectangular can (second embodiment, strength test result No. 3) in which two longitudinal reinforcing convex beads 15b1 and 15b2 are formed so as to extend from the end on the bottom plate 20b side. Even if the steel plate to be formed is made thinner, it is possible to obtain desired durability against uneven load and impact load, particularly in the corner portions 18a, 18b, 18c, and 18d.

  In each of the square cans described above, in particular, the bottom plate 20b extends from the end on the top plate 20a side to the boundary portion with the corner portion of the side wall surface following each side of each corner portion 18 (18a, 18b, 18c, 18d). Since the vertical reinforcing bead 12 extending to the end portion on the side is formed, it is possible to effectively prevent each corner portion 18 from being deformed or buckled abruptly with deformation or the like at the adjacent portion. Become.

  Furthermore, a third embodiment of the present invention will be described.

  A rectangular can according to the third embodiment of the present invention is configured as shown in FIGS. 10 is a plan view (a) and a front view (b) of the rectangular can according to the third embodiment of the present invention as seen from above, and FIG. 11 is a perspective view of the rectangular can. It is. As shown in FIGS. 10 and 11, the rectangular can according to the third embodiment is a vertical reinforcing convex bead that is paired with one corner 18b among the four corners 18a, 18b, 18c, 18d. It differs from the square can according to the first embodiment described above in that 15a and 15b are not formed.

  In this rectangular can (so-called 18-liter can), the top plate 20a (end plate) is joined to the upper end of the substantially square body 10 by winding, as in the first embodiment, and the lower end thereof. The bottom plate 20b (end plate) is joined by winding. In addition, two vertical reinforcing beads 12, two lateral reinforcing beads 14, and a rectangular reinforcing portion 16 are also formed on each side wall (panel) of the trunk portion 10 as in the first embodiment described above. .

  The body portion 10 of the rectangular can is manufactured, for example, according to a procedure as shown in FIGS.

  A rectangular metal plate (steel plate) 100 having portions corresponding to four side walls (panels) as shown in FIG. 12A is bent as shown in FIG. In this bending process, the metal plate material 100 is bent so that both end sides are overlapped at a substantially rectangular corner, and the overlapped end sides are joined by welding. As a result, a substantially rectangular cylinder 130 as shown in FIG. 13 is formed. As shown in FIG. 14 (enlarged detail view of the region Ec in FIG. 13), a joint portion (side seam portion) in which both side portions of the metal plate 100 are overlapped and welded to one corner portion of the cylindrical body 130. 19) is formed so as to extend in the longitudinal direction of the cylindrical body 130.

  10 and 11, the three corner portions 18a, 18c, and 18d of the trunk portion 10 that is the original shape of the cylindrical body 130 are continuously formed in a predetermined curved shape, while one corner portion is formed. The side seam part 19 mentioned above is formed in 18b. On the top portion 18top extending in the vertical direction of each of the three corner portions 18a, 18c, 18d in which the side seam portion 19 is not formed, the end portion on the top plate 20a side as in the first embodiment described above. A vertical reinforcing convex bead 15a is formed so as to extend a predetermined length from the bottom, and a vertical reinforcing convex bead 15b is formed so as to extend a predetermined length from the end on the bottom plate 20b side. Each vertical reinforcing convex bead 15a, 15b has a convex shape that protrudes outward from the inside of the body portion 10 (see FIG. 4B).

  On the other hand, the side seam portion 19 is formed in the remaining one corner portion 18b of the body portion 10 as described above, and this side seam portion 19 is formed of the metal plate material 100 as shown in FIG. Both end sides (see FIG. 14) are formed by being overlapped and welded, and have a structure in which two metal plate materials are substantially superimposed.

  The body 10 having such a structure is manufactured from a cylindrical body 130 as shown in FIG. 13 by a press device (mold mechanism). As for the three corner portions 18a, 18c, 18d to be formed with the pair of longitudinal reinforcing convex beads 15a, 15b, the mold mechanism portion similar to the case of the first embodiment described above (FIGS. 5 and 6). Reference). Further, the corner portion 18b in which the side seam portion 19 is formed is formed by a mold mechanism portion as shown in FIG.

  16, the mold mechanism portion where the corner portion 18b where the side seam portion 19 is formed is the mold mechanism portion where the aforementioned corner portion where the side seam portion 19 is not formed is formed (see FIG. 5). ), The inner mold 230 in which the concave portion 231 is formed and the outer mold 210 in which the convex portion 211 is formed are arranged to face each other, and the inner mold 240 and the convex portion 221 in which the concave portion 241 is formed. Are arranged so as to face each other. Similarly to the mold mechanism portion (see FIG. 5) where the corner portion where the side seam portion 19 is not formed is to be formed, a corner space 201 is formed at a corner portion where the inner dies 230 and 240 face each other. In the corner space 201, the in-corner mold 280 is arranged. The outer tip of the inner corner mold 280 is a press surface that is curved in a convex shape in accordance with the curvature of the corner having the side seam 19 to be molded. Further, an outer corner mold 270 is disposed outside the inner corner mold 280 with the press surface facing inward. The pressing surface of the outer corner mold 270 has a concave curved shape (concave curved surface 271) corresponding to the convex curved shape of the outer tip portion of the inner corner mold 280.

  In the entire mold mechanism, the inner molds 230 and 240, the outer molds 210 and 220, the corner inner molds 260 (see FIG. 5), 280, and the corner outer molds 250 (see FIG. 5), 270 The mold is clamped and opened by a hydraulic expander mechanism. At the time of clamping, the inner molds 230 and 240 move outward, the corner inner molds 260 (see FIG. 5) and 280 move diagonally outward, and the outer molds 210 and 220 move inward. The outer corner mold 250 (see FIG. 5) and 270 move diagonally inward. When the mold is opened, the inner molds 230 and 240 are moved inward, the corner inner molds 260 (see FIG. 5) and 280 are moved obliquely inward, and the outer molds 210 and 220 are moved outward. Further, the outer corner mold 250 (see FIG. 5) and 270 move obliquely outward.

  In such a mold mechanism, a steel plate cylinder 130 (see FIG. 13), which is the original form of the body portion 10, is set between the inner molds 230 and 240 and the outer molds 210 and 220. In this state, first, the inner molds 230 and 240 move outward. Thus, when the corner space 201 is expanded, the inner corner molds 260 (see FIG. 5) and 280 move outward, the outer corner molds 250 (see FIG. 5) and 270 move inward, and the inside of the corner The mold 260 and the corner outer mold 250 are clamped, and the corner inner mold 280 and the corner outer mold 270 are clamped. Thereby, the top part (18top) of the corner part of the cylinder 130 (body part 10) is inserted | pinched by the outer side front-end | tip part of the metal mold | die 260 in a corner, and the press surface in which the recessed part 251 of the corner outer metal mold | die 250 was formed, Longitudinal reinforcing convex beads 15a and 15b that match the concave portion 251a of the corner outer mold 250 are formed on the top (18top) of the corner portion (see FIG. 6).

  At this time, as shown in FIG. 17, the corner including the side seam portion 19 of the cylindrical body 130 is formed by clamping the inner corner mold 280 and the outer corner mold 270 disposed in the corner portion having the side seam portion 19. The portion is tightened from both sides, and the curved shape of the corner portion of the cylindrical body 130 is maintained.

  Thereafter, the outer molds 210 and 220 move inward, and the inner molds 230 and 240 and the outer molds 210 and 220 are clamped. As a result, as shown in FIGS. 6 and 17, the cylindrical body 130 is molded so as to have a regular outer shape (substantially square shape) as the body portion 10, and the inner molds 230, 240 and the outer Formed on the pressing surfaces of the inner molds 230 and 240 and the pressing surfaces of the outer molds 210 and 230 on the pressing surfaces of the inner molds 230 and 240 and the concave and convex shapes formed on the pressing surfaces of the outer molds 210 and 230, respectively. Various reinforcing beads (for example, vertical reinforcing beads 12) that match the uneven shape (for example, the convex portions 211 and 221) are formed.

  When the molding is completed, the mold opening between the corner inner mold 260 and the corner outer mold 250 and the mold opening between the corner inner mold 280 and the corner outer mold 270 are performed, and then the inner molds 230 and 240 are opened. The mold opening with each of the outer molds 210 and 220 is performed. And it becomes the regular external shape as the trunk | drum 10 of a square-shaped can, and the cylinder 130 in which various reinforcement beads (refer FIG.10, FIG.11, FIG.4 and FIG. 15) were formed is each inner metal mold | die 230,240. And between the outer molds 210 and 220.

  In the above-described example, the vertical reinforcing beads 12, the horizontal reinforcing beads 14, and the rectangular reinforcing portions 16 are formed on the cylindrical body 130 formed of the metal plate member 100 together with the vertical reinforcing convex beads 15a and 15b. Although it was a thing, reinforcement parts (vertical reinforcement bead 12, lateral reinforcement bead 14, rectangular reinforcement part 16, etc.) other than longitudinal reinforcement convex beads 15a and 15b are to metal plate material 100 (refer to Drawing 12 (a)). It can also be formed. In this case, the metal plate member 100 in a state where the reinforcing portion is formed is bent (see FIG. 12B).

  A rectangular can according to the fourth embodiment of the present invention is configured as shown in FIG. In the square can according to the fourth embodiment, each of the three corner portions 18a, 18c, 18d in which the side seam portion 19 is not formed is provided with the second embodiment (see FIG. 7) described above. Similarly, two pairs of vertical reinforcing convex beads 15a1 and 15a2 are formed. Further, the rectangular can according to the fourth embodiment is such that two pairs of longitudinal reinforcing convex beads 15a1 and 15a2 are formed in each of the three corner portions 18a, 18c and 18d. Is the same as the rectangular can according to the third embodiment described above.

(Strength test result)
A strength test was performed on the above-described square can according to the third embodiment of the present invention (see FIGS. 10 to 17) and the square can according to the fourth embodiment of the present invention (see FIG. 18). . In each of the eccentric load test, the overall load test, and the corner vertical impact load test (observation of the dents in the panel portion and the horizontal deformation trace), the rectangular can according to the third embodiment is the first It had substantially the same durability performance as that of the rectangular can according to the embodiment (NO. 1 in FIG. 8). Further, the square can according to the fourth embodiment also had substantially the same durability performance as the square can according to the second embodiment (NO. 3 in FIG. 8).

  In this way, even when only one or two pairs of longitudinal reinforcing convex beads are formed only in the other corner portions 18a, 18c, 18d except for one corner portion 18b, 1 is added to all four corner portions. Durability characteristics substantially equivalent to the case of forming a pair or two pairs of longitudinal reinforcing convex beads are obtained because the corner portion 18b in which the side seam portion 19 is formed (where no vertical reinforcing convex beads are formed) It is surmised that the side seam portion 19 is substantially reinforced by joining two metal plate members (steel plates).

  Thereby, it forms so that it may extend from each of the edge part on the top plate 20a side and the edge part by the side of the bottom plate 20b on each top part 18top of three corner parts 18a, 18c, 18d except the corner part 18b which has the side seam part 19. The corner portions 18a, 18c, and 18d are reinforced by the pair of vertical reinforcing convex beads 15a and 15b, and the corner portion 18b of the side seam portion 19 can be reinforced by the side seam portion 19 (third According to the embodiment of the present invention, even if the steel plate as a material is made thinner, it is possible to obtain the desired durability against the uneven load and the impact load particularly in the corner portions 18a, 18b, 18c, 18d. Further, the two vertical reinforcing convex beads 15a1 are joined along the top portions 18top of the three corner portions 18a, 18c, 18d excluding the corner portion 18b having the side seam portion 19, and extend from the end on the top plate 20a side. 15a2 and a rectangular can (fourth embodiment) in which two longitudinal reinforcing convex beads 15b1 and 15b2 are formed so as to extend from the end on the bottom plate 20b side in pairs with them. Even if the steel plate used as a material is thinned, it is possible to obtain desired durability against uneven load and impact load, particularly at the corner portions 18a, 18b, 18c, and 18d.

  Further, it is possible to obtain substantially the same durability performance as that of the four corner portions 18a, 18b, 18c, and 18d only by forming the longitudinal reinforcing convex beads at the three corner portions 18a, 18c, and 18d except the one corner portion 18b. As a result, a highly durable square can can be more easily manufactured.

  Furthermore, even in the case of a rectangular can in which the longitudinal reinforcing convex beads are formed only at the corner portions 18a, 18c, 18d except the corner portion 18b with the side seam 19, the corner portions 18 (18a, 18b, 18c and 18d), the vertical reinforcing beads 12 extending from the end on the top plate 20a side to the end on the bottom plate 20b side are formed at the boundary portion between the side wall surface and the corner portion 18 on each side of each of the corners 18c and 18d). It is possible to effectively prevent the portion 18 from being avalancheally deformed or buckled due to deformation or the like at the adjacent portion.

  As described above, the rectangular can according to the present invention has an effect that desired durability against uneven load can be obtained even at a corner portion even if a steel plate as a material is made thinner. It is useful as a rectangular can such as a so-called 18 liter can.

Claims (2)

Join both ends of a rectangular metal plate together, and join the end plates to the open ends of the body that forms a substantially rectangular tube that is formed so that the joint becomes a corner. Is a square shaped can,
And wherein on top of each corner except for the corner portion with the joint portion of the body portion, extending from each of said ends, and vertical reinforcing convex bead of a pair that protrudes outward is formed A square can. A longitudinal reinforcing bead extending from a joint portion with one end plate to a joint portion with the other end plate is formed at a boundary portion with the corner portion of the side wall surface following each side of each corner portion in the body portion. The rectangular can according to claim 1 , wherein:

Images