JP2013151325A - Polygonal can, method of manufacturing the same, and can forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polygonal can, a method of manufacturing the same, and a can forming apparatus, capable of securing a sufficient withstand load of the polygonal can and capable of preventing a decrease in thickness or unevenness in thickness in a sidewall part.SOLUTION: In a polygonal can W10, a plurality of sidewall parts W2 are connected via corners W3 and both ends are polygonal openings. A sidewall shape part D is formed corresponding to each of the sidewall parts W2. Each sidewall shape part D is formed between corners W3 at both sides of each of the sidewall parts D, and is provided with a bead group B in which at least one group of a plurality of concave beads and a plurality of convex beads extending along a direction from one opening toward the other opening is arranged.

Description

  The present invention relates to a polygonal can, a method for manufacturing a polygonal can, and a can molding apparatus.

As is well known, cost reduction is achieved by improving the load resistance of a polygonal can and reducing the thickness of the steel plate of the polygonal can. In order to improve the load resistance of such a polygonal can, a method of forming a reinforcing shape portion on the barrel side wall portion of the polygonal can is known, and a rectangular reinforcing portion is widely used as an example of the reinforcing shape portion. (For example, refer to Patent Documents 1 and 2.)
Most of the reinforcement-shaped parts including the rectangular reinforcement part are made up of the inner mold placed inside the barrel and the outer mold placed outside the barrel relative to the cylinder before attaching the end plate. In general, it is formed by press working with a pinch in between.

JP 2006-026638 A JP 2007-237185 A

  However, the forming of the rectangular reinforcing portion can improve the load resistance relatively easily, but the plastic deformation of the material steel plate is greatly deformed at the connecting portion where the vertical and horizontal concaves or convexes are connected. There is a possibility that thinning or uneven thickness of the material in the vicinity may occur. When partial thinning or uneven thickness occurs in the vicinity of the connection part of the rectangular shape part, it is necessary to set the plate thickness of the material steel plate of the polygonal can according to the part where the connection part is thinned, Even if a load resistance other than is secured, it is difficult to reduce the thickness of the entire side wall.

In addition, for example, contents such as seasonings, soy sauce, animal oil, paints with high viscosity, additives and auxiliaries are filled in the polygonal can at a high temperature, so the polygonal can with the contents filled As the temperature drops, the inside of the can is decompressed.
Especially in the winter when the temperature is low, when a polygonal can filled at high temperature is stored in a warehouse, deformation such as crushing and dents is likely to occur, and the can body is decompressed according to the temperature difference between the filling temperature and the temperature. Since it becomes inside, there exists a problem that it is easy to buckle with respect to the load from upper direction.

  The present invention has been made in consideration of such circumstances, and when the reinforcing shape portion is formed on the side wall portion of the polygonal can at the stage of the material plate material or the side wall portion of the cylindrical body, sufficient load resistance is provided. It is possible to suppress the occurrence of thinning and uneven thickness in the side wall while ensuring that the contents are filled with high temperature, and even if the inside of the can is depressurized by lowering the temperature to normal temperature, It is an object of the present invention to provide a polygonal can capable of ensuring sufficient strength against a load from the above, a method for manufacturing a polygonal can suitable for manufacturing such a polygonal can, and a can molding apparatus.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a polygonal can in which a plurality of side wall parts are connected via a corner part, and an end plate is joined to at least one of the opening parts of a cylindrical body whose both ends are polygonal opening parts. The cylindrical body is formed with a side wall shape portion on each side wall portion, and the side wall shape portion includes a bead group, and the bead group is between corner portions on both sides of the corresponding side wall portion. A plurality of concave beads extending in a direction from the one opening toward the other opening, and a plurality of beads consisting of convex beads, and the width and length of adjacent beads. And it is comprised including the flat part which is below length.

  According to the polygonal can according to the present invention, since the side wall shape portion includes a bead group in which a plurality of beads are arranged, it is possible to suppress occurrence of thinning and uneven thickness in the side wall portion while ensuring sufficient load resistance. Even if the inside of the can is in a reduced pressure state by filling the contents at a high temperature and lowering the temperature to room temperature, sufficient strength can be secured against the load from above.

  By providing a bead group in the side wall shape part, sufficient strength (compressive strength, buckling resistance) against the load from above even when the contents are filled at high temperature and the inside of the can is in a reduced pressure state due to temperature drop Since the rectangular shape part is formed by continuously forming the vertical shape part and the horizontal shape part, when the surface pressure due to the reduced pressure acts on the rectangular shape part, It is estimated that the entire rectangular shape portion is displaced inward integrally with respect to the side wall portion, and as a result, the load is supported only by the side wall portion around the rectangular shape portion.

In this specification, the side wall-shaped portion is a concave or convex shape with respect to a flat surface constituting each side wall portion (a surface connecting adjacent corner portions, excluding bulges and dents without a step). And a shape part constituted by a flat portion sandwiched between concave and convex portions. Moreover, the side wall shape part formed in each side wall part does not need to be the same.
The corner portion refers to a connecting portion between the side wall portion and the side wall portion. The corner portion may be a straight line in a plan view, a curved line segment such as an arc, or a part of a polygonal shape. Say.

  The bead group is a set of beads in which a plurality of concave beads and convex beads are arranged extending in a direction from one opening to the other opening. In addition, when a flat portion is formed between adjacent beads, the flat portion constitutes a bead group if it is equal to or smaller than the dimensions (width and length) of the beads on both sides sandwiching the flat portion. And Moreover, the number of the bead groups formed in each side wall part is not limited.

  Further, by arranging the bead group in which such a plurality of beads are arranged on the side wall portion, the strength of the side wall portion, which is lower in strength than the corner portion and is easily subjected to surface pressure, is improved. As a bead group, a plurality of beads are arranged adjacent to each other, or when flat portions are formed between the beads, both sides sandwiching the flat portions are improved. It is presumed that by making the bead size or less, a plurality of beads interact with each other more easily than when a plurality of single beads are arranged with a considerable size.

Moreover, a bead means the concave or convex extended along the direction which goes to the other opening part from one opening part.
In addition, each bead group and each bead may be formed from the opening to the opening, or one or both may be formed to a position separated from the opening, and from one opening to the other The phrase “along the direction toward the opening” includes a case where it is formed obliquely and also includes a case where the width is changed.

  In addition, the cylinder includes an unformed cylinder (first cylinder) in which the bead group is not formed, a bead group-attached cylinder (second cylinder) in which the bead group is formed, and a reformed cylinder (in which reform is completed) 3rd cylinder), and the intermediate product (for example, a part of side wall shape part is unmolded) before a side wall shape part is shape | molded from an unshaped cylinder, and an end plate is attached.

  Invention of Claim 2 is the polygonal-shaped can of Claim 1, Comprising: The said bead group is extended and formed from said one opening part to the other opening part, It is characterized by the above-mentioned. To do.

  According to the polygonal can according to the present invention, since the bead group extends from one opening to the other opening, the forming accuracy for each bead (extending direction) end position when forming the bead group. The bead group can be easily and efficiently formed.

  Invention of Claim 3 is a polygonal-shaped can of Claim 1 or Claim 2, Comprising: The said side wall shape part is equipped with two bead groups symmetrical to the width direction center of the said side wall part. Features.

  According to the polygonal can according to the present invention, since two symmetrical bead groups are provided in the center of the side wall in the width direction, the strength balance (left and right) in each side wall, stress caused by molding, and deformation Balance can be ensured. Moreover, the design as a polygonal can can be improved.

  Invention of Claim 4 is the polygonal-shaped can of Claim 3, Comprising: The said bead group is provided with the concave bead formed in order from the left-right corner part, and a convex bead, respectively. It is characterized by.

  According to the polygonal can according to the present invention, the concave bead and the convex bead are formed in order from the corner portion. Therefore, the folded shape by bending or bending by the corner portion and the concave bead (for example, substantially S-shaped, etc.) Therefore, it is possible to secure a large section modulus and efficiently improve the strength of the side wall portion.

  The invention according to claim 5 is the polygonal can according to claim 4, wherein the bead group includes a flat portion formed between the concave bead and the convex bead. To do.

  According to the polygonal can according to the present invention, since the flat portion is formed between the concave bead and the convex bead, a larger section modulus of the bead group can be ensured.

  A sixth aspect of the present invention is the polygonal can according to any one of the first to fifth aspects, wherein the cylindrical body includes four side wall portions.

  According to the polygonal can according to the present invention, the cylindrical body has four side walls and is rectangular in plan view, so that the accommodation efficiency can be increased and the handling can be facilitated.

  A seventh aspect of the present invention is the polygonal can according to any one of the third to sixth aspects, wherein each of the side wall-shaped portions is between the bead groups on the left and right. It is characterized by having a lateral bead formed at a distance from the group.

According to the polygonal can according to the present invention, the side wall portion and the polygonal can can be efficiently reinforced by providing the side wall shape portion with the horizontal bead.
Moreover, work efficiency can be improved by setting it as the standard | work (a mark etc.) at the time of the work in a post process including label sticking (up-down direction positioning) and handling a polygonal can. In addition, the design can be improved.

Invention of Claim 8 is a manufacturing method of the polygonal-shaped can of any one of Claims 1-6, Comprising: A material board is shape | molded in the shape corresponding to the said cylinder, The said cylinder The body is bent so as to correspond to the body, both ends of the body portion are opened, and opposite sides are joined together to form a first tube body, and the first tube body is formed from one opening of the body portion toward the other opening. An inner bead roller positioned inside the barrel portion of the first cylinder and an outer side of the barrel portion of the first cylinder and being disposed so as to face the inner bead roller with the barrel interposed therebetween The outer bead roller is pressed against the side wall portion of the first cylindrical body in cooperation with each other to form a side wall-shaped portion including the bead group to form a cylindrical body,
A method for manufacturing a polygonal can, wherein an end plate is connected to at least one opening of the cylindrical body to form a polygonal can.

  The invention according to claim 13 is a polygonal can in which a plurality of side wall portions are connected via a corner portion and end plates are joined to at least one of the opening portions of the cylindrical body having both ends being polygonal opening portions. A can forming apparatus for transporting the cylindrical body from one opening portion of the body portion toward the other opening portion, and the body portion of the tubular body transported by the transport device An inner bead roller disposed on the inner side, and an outer bead roller disposed on the outer side of the barrel portion of the cylindrical body and arranged to face the inner bead roller with the side wall portion interposed therebetween, and at least a pair of the inner bead rollers And the outer bead roller is formed corresponding to a side wall-shaped portion having a bead group, and the bead group is formed between corner portions on both sides of the corresponding side wall portion, Aperture A plurality of concave beads extending along the direction toward which the beads are formed, each of which includes a flat portion whose width and length are equal to or less than the width and length of adjacent beads. The inner bead roller and the outer bead roller cooperate with each other while rotating to press the side wall portion, thereby forming the side wall shape portion.

  According to the polygonal can manufacturing method and the can forming apparatus according to the present invention, the bead group of the side wall-shaped portion is formed by the bead roller corresponding to the bead group, and therefore, from one opening portion of the cylindrical body to the other opening portion. The bead group can be efficiently formed on each side wall portion while being conveyed.

  Invention of Claim 9 is a manufacturing method of the polygonal-shaped can of any one of Claims 1-7, Comprising: A material board material is shape | molded in the shape corresponding to the said cylinder, The said cylinder, Bends correspondingly and opens both ends of the body part to join the opposite sides to form a first cylinder, and transports the first cylinder from one opening of the body part toward the other opening. However, the inner bead roller located inside the trunk portion of the first cylinder and the outer bead positioned outside the trunk portion of the first cylinder and arranged to face the inner bead roller across the trunk portion Either one of a step of forming the bead group by pressing the bead roller in cooperation with the side wall portion of the first cylinder while rotating, and a step of forming the horizontal bead by press working. After going through the other process The side wall-shaped portion to form a cylindrical body provided with a, characterized in that the polygonal shape can connect the end plates with at least one opening of the cylindrical body by.

  According to the method for manufacturing a polygonal can according to the present invention, the bead group of the side wall-shaped part is formed by the bead roller corresponding to the bead group, so that the bead group is conveyed from one opening part of the trunk part toward the other opening part. The bead group can be efficiently formed on each side wall portion of the cylindrical body. Further, since the horizontal bead is formed by press working, it is possible to stably form the horizontal bead that is difficult to be formed by the bead roller.

  A tenth aspect of the present invention is the method of manufacturing a polygonal can according to the eighth or ninth aspect, wherein the bead group is formed on the front side in the transport direction with respect to the formation completion of the bead group by the inner bead roller and the outer bead roller. A reforming roller for reforming, comprising: an inner reforming roller disposed on the inner side of the body part, and an outer reforming roller disposed on the outer side of the body part and arranged to face the inner reforming roller with the body part interposed therebetween. The cylindrical body is reformed by pressing the corner portion of the body portion in cooperation with each other while rotating.

  The invention described in claim 14 is the can molding apparatus according to claim 13, wherein the cylindrical body is disposed in front of the forming direction of the bead group by the inner bead roller and the outer bead roller in the transport direction. A reforming roller for reforming the body part is provided, and the reforming roller is disposed inside the body part of the tubular body, and is disposed outside the body part of the tubular body and the body part. And an outer reforming roller disposed so as to be opposed to the inner reforming roller, and the inner reforming roller and the outer reforming roller are pressed together while rotating the corner portion of the trunk portion by a reforming roller pressing mechanism. It is comprised so that it may do.

According to the polygonal can manufacturing method and the can molding apparatus according to the present invention, the corner portion of the body portion is reformed by the reforming roller disposed on the front side (the rear side) in the transport direction from the formation completion part of the bead group. The body of the cylinder can be reformed by forming it into a stable flat shape. In addition, when a plurality of inner and outer reforming rollers are arranged in the transport direction, stable reforming can be performed.
The reforming may be performed at any position in the transport direction before the formation completion of the bead group. For example, the reforming roller is disposed at the rear in the transport direction from the bead roller not used for forming the bead group in the molding apparatus. You may arrange.
Further, when forming a horizontal bead, it is possible to arbitrarily set whether the reforming is performed before or after the horizontal bead molding.

  Invention of Claim 11 is a manufacturing method of the polygonal-shaped can of any one of Claims 1-7, Comprising: A material board material is shape | molded in the shape corresponding to the said cylinder, The said shaping | molding The formed material plate is formed by pressing the side wall shape portions corresponding to the respective side wall portions, bent so as to correspond to the cylindrical body, and opening both ends of the body portion to join the opposite sides to each other. A polygonal can is formed by forming a body and connecting an end plate to at least one opening of the cylindrical body.

  According to the method for manufacturing a polygonal can according to the present invention, since the side wall shape portion of each side wall portion is formed by press working, for example, there is a taper between one opening portion and the other opening portion, and the opening dimensions are different. Even in the case where the shape of one opening and the other opening is different, the side wall shape portion can be easily and efficiently formed. Further, when the side wall-shaped portion is provided with a horizontal bead (for example, when it is difficult to form with a bead roller in particular), the side wall-shaped portion can be formed more efficiently than the bead roller.

  Invention of Claim 12 is a manufacturing method of the polygonal-shaped can of any one of Claims 1-7, Comprising: A material board material is shape | molded in the shape corresponding to the said cylinder, The said material A cylindrical body having both ends opened by joining opposite sides of the plate material is inserted, a corner molding member corresponding to a corner portion of the cylindrical body is inserted into the cylindrical body, and the corner molding member is formed with a diameter of the cylindrical body. By moving outward in the direction and bending the corner part into a cylinder, the side wall part is pressed by an inner mold arranged inside the cylinder and an outer mold arranged outside, respectively. The side wall-shaped portion is formed on the side wall portion, and an end plate is connected to at least one opening of the cylindrical body to form a polygonal can.

  According to the method of manufacturing a polygonal can according to the present invention, after forming the cylindrical body, the corner molding member corresponding to the corner portion of the cylindrical body is inserted into the cylindrical body, and the corner molding member is inserted into the cylindrical body. Since it is moved radially outward to bend the corner portion into a cylindrical body, the cylindrical body can be formed efficiently, and then the side wall shape part is formed by pressing, so the polygonal can can be efficiently Can be manufactured.

According to the polygonal can according to the present invention, it is possible to suppress the occurrence of thinning and uneven thickness in the side wall portion while ensuring sufficient load resistance, and as a result, the contents are filled at high temperature and the temperature is lowered to room temperature. Even when the inside of the can is in a reduced pressure state, it is possible to ensure sufficient strength against the load from above.
In addition, according to the polygonal can manufacturing method and the can forming apparatus for forming the bead group of the side wall shape portion by the bead roller according to the present invention, the bead group can be efficiently formed on the side wall portion.
Moreover, according to the manufacturing method of the polygonal-shaped can which shape | molds the side wall shape part of each side wall part by press work based on this invention, for example, when the dimension and shape of one opening part and the other opening part differ. Even if it exists, a side wall shape part can be shape | molded easily and efficiently.

It is a figure which shows schematic structure of the polygonal can which concerns on the 1st Embodiment of this invention. It is a figure which shows the polygonal-shaped can which concerns on 1st Embodiment, (A) is a figure which shows the outline of the YY cross section in FIG. 1, (B) is a figure which shows the detail of a bead group. It is a figure which shows the polygonal-shaped can which concerns on 1st Embodiment, (A) is a figure which shows the outline of the XX cross section in FIG. 1, (B) is a figure which shows the detail of a horizontal bead. It is a perspective view which shows schematic structure of the cylinder which concerns on 1st Embodiment. It is a figure which shows the outline of the manufacturing process of the polygonal can which concerns on 1st Embodiment. It is a figure which shows schematic structure of the can molding apparatus which concerns on 1st Embodiment. It is a schematic block diagram which shows arrangement | positioning of the bead roller of a bead forming unit, (A) shows arrangement | positioning of the bead roller (A surface 1ST, A surface 2ND) which performs the bead process by the A surface side of side wall part W2, (B) Shows an arrangement of bead rollers for performing bead processing (B surface 1ST, B surface 2ND) on the B surface side of the side wall W2. It is a figure which shows the positional relationship of the inner bead roller and outer bead roller of A surface 1ST, B surface 1ST, A surface 2ND, and B surface 2ND. It is a figure which shows the position at the time of (A) use of an inner bead roller, and (B) non-use of an inner bead roller. It is a figure which shows schematic structure of an inner bead roller and an outer bead roller. It is a figure which shows the detail of an inner bead roller and an outer bead roller. It is a figure which shows the arrangement | positioning state of two sets of inner bead rollers with respect to a cylinder, and an outer bead roller. It is a figure which shows the arrangement | positioning state of the inner bead roller of each set with respect to a cylinder, and an outer bead roller. (A) The schematic block diagram which shows arrangement | positioning of the reforming roller of a reforming unit, (B) The figure which shows the arrangement | positioning state of the reforming roller with respect to a polygonal shape can. It is a figure which shows the shape of an inner reforming roller and an outer reforming roller. It is a figure which shows the state which an inner reforming roller and an outer reforming roller contact-rotate with respect to a polygonal can. It is a figure which shows the ZZ cross section in FIG.5 (D), (A) Unformed cylinder after welding, (B) Bead group attached cylinder after bead group processing, (C) After remodeling It is a figure which shows the cross section which concerns on a reforming cylinder. It is a figure which shows the outline of the manufacturing process of the polygonal-shaped can which concerns on 2nd Embodiment. It is a figure which shows the modification of the bead group which comprises the side wall shape part which concerns on this invention. It is a figure which shows the 1st modification of the horizontal bead which comprises the side wall shape part which concerns on this invention. It is a figure which shows the 2nd modification of the horizontal bead which comprises the side wall shape part which concerns on this invention. It is a figure which shows the modification of the inner reform roller and the outer reform roller of the can shaping | molding apparatus which concerns on this invention.

The first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a diagram showing a schematic configuration of a rectangular can (polygonal can) W10 according to the first embodiment, FIG. 1 (A) is a top view, and FIG. 1 (B) is a side view. .

  As shown in FIG. 1, the polygonal can W10 includes a top plate (end plate) WT and a bottom plate (end plate) WB having a substantially rectangular shape in plan view and four corners as corner portions W3, and the top plate WT and The cylindrical body W is connected to the peripheral edge portion of the bottom plate WB, and is formed of four side wall portions W2 having a substantially rectangular shape in side view, and a side wall shape portion D is formed on each side wall portion W2 of the cylindrical body W.

The side wall-shaped portion D is formed between two bead groups B and B extending along a direction from one opening to the other opening in the cylindrical body constituting the rectangular can W10, and the bead groups B and B. It has two pairs of horizontal beads C and C which are arranged and formed in the vicinity of the upper and lower openings.
Each bead group B is formed symmetrically in the center of the side wall portion W2 in the width direction, and includes a concave bead B1, a flat portion B2, and a convex bead B3 arranged in order from the corner portion W3.

As shown in FIG. 2B, the bead group B includes a concave bead B1, a flat portion B2, and a convex bead B3. The concave bead B1, the flat portion B2, and the convex bead B3 are formed from the respective corner portions W3. It forms in this order toward the center of the side wall part W2.
The concave bead B1 is composed of two sides sandwiching the apex angle of an obtuse isosceles triangle that is recessed inward from the flat surface of the side wall portion W2 in plan view, and the convex bead B3 is formed on the side wall portion W2 in plan view. Projecting outward from the flat surface, the corner portion W3 side is composed of two sides sandwiching the apex angle of a slightly long obtuse triangle, and the flat portion B2 is formed at substantially the same position as the flat surface of the side wall portion W2.
In addition, the flat surface G between the two bead groups B and B is, for example, in consideration of a springback that occurs when the bead group B is formed. It is configured to bulge outward with an inclination of 2 ° to 5 ° with respect to a straight line (indicated by a broken line). As a result, it is possible to suppress dents in the can body during molding.

In this embodiment, the bead group B, the beads B1 and B3 constituting the bead group B, and the flat part B2 are formed on all the side wall parts W2, and each linearly continuous from one opening part to the other opening part. Molded.
As shown in FIGS. 1B and 3, the horizontal beads C are formed in the vicinity of both the upper and lower openings of the side wall W2, and the upper and lower horizontal beads C are formed in order from the opening. A bead C1 and a second horizontal bead C2 are provided.
The first horizontal bead C1 is composed of two sides sandwiching the apex angle of an obtuse isosceles triangle protruding outward from the flat surface of the side wall W2 when viewed from the side, and the second horizontal bead C2 is viewed from the side. The side of the opening that protrudes outward from the flat surface of the side wall W2 and that is adjacent to the upper and lower sides longer than the first horizontal bead C1 is composed of two sides that sandwich the apex angle of a slightly longer obtuse triangle. A slight flat portion is formed between the first horizontal bead C1 and the second horizontal bead C2. Further, as shown in FIG. 3B, a joint portion M formed by welding or caulking, for example, is formed at the upper end portion (and the lower end portion) of the reformed cylindrical body W13.

  Further, as shown in FIG. 1B, for example, the inner distance L1 between the left and right bead groups B, B is a length corresponding to the width of the label attached to the side wall W2, and the upper and lower horizontal beads C, The inner distance L2 between C is a length corresponding to the longitudinal length of the label. Here, “corresponding to the width of the label” does not need to coincide with the label width, and includes, for example, a label position standard.

FIG. 4 is a perspective view showing a substantially rectangular tubular body W formed in the manufacturing process of the rectangular can W10 according to the first embodiment.
An unformed cylinder (first cylinder) W11 shows a state where the bead group B is not formed, and a bead group-attached cylinder (second cylinder) W12 shows a state where the bead group B is molded, a reformed cylinder (first (3 cylinder) W13 is a reformed cylinder W12 with a bead group, and both ends are opened in shapes corresponding to the top plate WT and the bottom plate WB.
The cylindrical body W is an unformed cylinder W11, a bead grouped cylinder W12, a reformed cylinder W13, an unformed cylinder W11 to a bead grouped cylinder W12, and a bead grouped cylinder W12 to a reformed cylinder W13. It is a concept that includes an intermediate process product being formed.

  According to the rectangular can W10 according to the first embodiment, the side wall-shaped portion D includes a bead group B having a concave bead B1, a flat portion B2, and a convex bead B3 formed in order from the corner portion W3, and a rectangular can. Since the two beads C1 and C2 are provided in the vicinity of the upper and lower openings of W10, the strength of the square can W10 can be efficiently improved.

In addition, according to the square can W10, it is possible to suppress the occurrence of thinning and uneven thickness in the side wall W2 while ensuring sufficient load resistance, and the contents are filled at a high temperature and the temperature is lowered to room temperature. Even when the inside of the can is in a reduced pressure state, it is possible to ensure sufficient strength against the load from above.
Further, according to the rectangular can W10, the bead group B extends from one opening to the other opening, so that the bead group B can be easily and efficiently formed.

  Further, according to the rectangular can W10, the inner space between the two bead groups B, B in the width direction of the side wall portion W2 and the inner space between the horizontal beads C, C are formed corresponding to the size of the label. Therefore, a label can be stuck efficiently. Here, corresponding to the label size (length in the vertical direction) includes a label sticking position standard as well as the label width.

Drawing 5 is a figure explaining the process of forming cylindrical body W (W11, W12, W13) among the manufacturing processes (manufacturing procedure) of square shape can W10 concerning a 1st embodiment.
(1) First, for example, a material plate P0 having a rectangular outer shape as shown in FIG. Reference symbol P11 is a portion to be bent for forming the corner portion W3 of the cylindrical body W.
(2) Next, as shown in FIG. 5 (B), the bent portion P11 of the material plate P0 is bent by providing a corner portion W3, and the longitudinal ends of the material plate P0 facing each other by bending are welded. As a result, an unformed cylinder W11 is manufactured as the joint W5.
(3) Next, as shown in FIG. 5C, the unformed cylinder W11 is sequentially formed into a bead group-attached cylinder W12 and a reformed cylinder W13.
(4) Next, as shown in FIG. 5D, a horizontal bead C is formed by the pressing device 6 in the vicinity of both the upper and lower openings of the cylindrical body W.
Thereafter, the top plate WT and the bottom plate WB are connected to the cylindrical body W by caulking or the like.

FIG. 6 is a diagram showing a schematic configuration of a can molding line according to the present invention. Reference numeral 5 indicates a can molding apparatus, reference numeral 1 indicates a transport apparatus that sequentially transports the cylindrical body W in the arrow X direction, and reference numeral 6 indicates a press. The device is shown.
The conveyance device 1 is configured to convey a cylindrical body W formed in a polygonal cylindrical shape with both ends open from one opening toward the other opening.
In this example, as shown in FIGS. 7 and 8, the body portion of the cylindrical body W includes a side wall portion W <b> 2 of the A surface and a side wall portion W <b> 2 of the B surface which are in a positional relationship facing each other.
In addition, the press apparatus 6 shape | molds the horizontal bead C to the cylinder body in which the bead group B was shape | molded, and can use a well-known technique.

Moreover, in the can shaping | molding apparatus 5, the bead shaping | molding unit 2 and the reform unit 3 are provided in series along the conveyance direction (arrow X direction) of the cylinder W. As shown in FIG.
As shown in FIGS. 7 to 13, the bead forming unit 2 includes a plurality of bead roller sets 10 arranged on the conveyance path of the cylindrical body W in the conveyance device 1, and these bead roller sets 10 when the cylindrical body W is conveyed. And a bead roller pressing mechanism 15 (see FIG. 9).

The bead roller set 10 includes a pair of an inner bead roller 11 and an outer bead roller 12 which are disposed on the inner side and the outer side of the conveyance path of the cylindrical body W in the conveying device 1 and are separated from each other. The bead roller 11 and the outer bead roller 12 rotate. It rotates around the shafts 11A and 12A.
As shown in FIGS. 7 and 8, the bead roller set 10 includes two side wall portions W <b> 2 that face each other on one side (A surface) of the cylindrical body W, and two that face each other on the other side (B surface) of the cylindrical body W. It is arranged corresponding to the side wall portion W2.

In this embodiment, two sets of bead roller sets 10 are arranged on each side wall W2 in correspondence with the two bead groups B of each side wall W2 on the A side, and similarly, each side wall W2 on the B side. Two sets of bead roller sets 10 are arranged, and eight sets of bead roller sets 10 are arranged at the same position in the transport direction (arrow X direction).
Further, the rotation shafts 11A and 12A of the A-side bead roller set 10 and the rotation shafts 11A and 12A of the B-side bead roller set 10 are arranged orthogonal to each other when viewed from the direction of the axis W1 of the cylindrical body W. Has been.

Further, in this embodiment, for example, the eight bead roller sets 10 are arranged in series in the transport direction (arrow X direction) at a predetermined interval in the transport direction rear position: 1ST and transport direction front position: 2ND. Are provided in two stages.
Further, each inner bead roller 11 can be advanced and retracted with respect to the corresponding outer bead roller 12 by a bead roller pressing mechanism 15.

  In this embodiment, for example, the 1ST B-side bead roller set 10 and the 2ND A-side bead roller set 10 are reduced in diameter so that the 1ST A-side bead roller set 10 and 2ND By forming the bead group B only by the bead roller set 10 for the B surface, it is possible to suppress the occurrence of misalignment or the like in the bead group B of each side wall W2. FIGS. 7 and 8 show the bead roller set 10 on the B side of 1ST and the A side of 2ND in a state where the diameter is not reduced for convenience.

  The bead roller pressing mechanism 15 includes an actuator (for example, an air cylinder) 16, a connecting portion 17, and a tapered roller operating portion 18. The rod of the actuator 16 is connected to the synchronization transmission plate 16A at the tip, and the synchronization transmission plate 16A is connected to the roller operating portion 18 via the connection portion 17, and the actuator 16 advances and retreats in the directions of arrows F and R. The roller operating unit 18 moves.

  The roller operating unit 18 is in contact with the cam followers of the inner bead roller 11 and the outer bead roller 12, and moves the inner bead roller 11 and the outer bead roller 12 in the arrow M direction and in the opposite direction. The cylindrical body W is guided with a guide roller 19 (a transport position rear position 19A, a transport direction front position 19B) inscribed therein.

  As a result, as shown in FIG. 9A, when the rod of the actuator 16 moves backward and the roller operating portion 18 moves the synchronizing transmission plate 16A in the direction of arrow R, the inner bead roller 11 moves in the direction of arrow M. 12 is moved to a “roller use position” that is advanced toward 12.

  Further, as shown in FIG. 9B, when the rod of the actuator 16 moves forward and the roller operating portion 18 moves the synchronization transmission plate 16A in the direction of arrow F, the inner bead roller 11 moves backward from the outer bead roller 12. It moves to the “roller non-use position”.

  As shown in FIGS. 10 to 13, a concave portion 11 </ b> B is formed at the tip of the inner bead roller 11, and a convex portion 12 </ b> B corresponding to the concave portion 11 </ b> B is formed at the tip of the outer bead roller 12. When the cylinder W is moved in the direction of the arrow X by the conveyance by the conveyance device 1 with the side wall W2 of the cylinder W conveyed by the conveyance device 1 being sandwiched between them, When these bead rollers 11 and 12 are in contact with and pressed against the side wall W2 of the cylindrical body W, the bead group B is formed in the unformed cylindrical body W11.

FIG. 11 is a diagram illustrating the inner bead roller 11 for molding the concave portion B1, the flat portion B2, and the convex portion B3 of the bead group B, and the concave shape portion 11B and the convex shape portion 12B of the outer bead roller 12.
The concave portion 11B includes a concave portion 11C, a flat portion 11D, and a convex portion 11E corresponding to the concave portion B1, the flat portion B2, and the convex portion B3. The concave shape portion 11C has a larger trapezoidal shape than the concave portion B1. The shape part 11E is formed in substantially the same shape as the recess B1.
The convex portion 12B includes a convex portion 12C, a flat portion 12D, and a concave portion 12E corresponding to the concave portion B1, the flat portion B2, and the convex portion B3. The convex portion 12C has a convex shape substantially the same as the concave portion B1. The shape part 11E is formed in a larger trapezoidal shape than the recess B1.

  With the inner bead roller 11 moving forward and in proximity to the outer bead roller 12 and positioned at the “roller use position”, the conveyed cylinder W is sandwiched between the inner bead roller 11 and the outer bead roller 12, and the inner and outer bead rollers 11, 12 are located. The bead group B is formed on the side wall W2 of the cylindrical body W by contacting and cooperating with the cylindrical body W while rotating.

  In this embodiment, since the bead group B is formed over the entire length of the cylindrical body W, the bead forming unit 2 has the inner bead roller 11 in the direction of arrow M with respect to the outer bead roller 12 as shown in FIG. It is always operated at the advanced roller use position.

  The reform unit 3 reforms the cylindrical body W curved after the bead processing on the front side (post-process) of the bead forming unit 2 in the transport apparatus 1, and as shown in FIGS. The inner reforming roller 21 disposed inside the corner portion W3 of the side wall portion W2 of the cylindrical body W, and the outer reforming disposed opposite to the inner reforming roller 21 and sandwiching the side wall portion W2 along the conveyance path. A reforming roller set 20 having a roller 22 is provided, and the inner reforming roller 21 and the outer reforming roller 22 press the corner portion W3 of the side wall portion W2 in cooperation with each other while rotating.

  As shown in FIG. 14B, one set of the inner reforming roller 21 and the outer reforming roller 22 is conveyed to each of the four corner portions W3 of the cylindrical body W symmetrically with respect to the axis W1 of the cylindrical body W (four sets in total). For example, it is arranged in five steps (20 sets in total) at regular intervals in the conveying direction (arrow X direction) of the cylinder W, and the side wall W2 is formed by passing the cylinder W. It has been reformed. Note that the positions of the inner reforming roller 21 and the outer reforming roller 22 from the axis W1 can be adjusted according to the form of the cylindrical body W.

Further, as shown in FIG. 15, a convex portion 21B is formed at the tip of the inner reforming roller 21, and a concave portion 22B corresponding to the convex portion 21B is formed at the tip of the outer reforming roller 22. Has been.
Further, as shown in FIG. 16, the reform unit 3 sandwiches the corner portion W <b> 3 of the cylindrical body W transported by the transport device 1 between the inner reformer roller 21 and the outer reformer roller 22, and the inner and outer reformer rollers 21 and 22 rotate. While touching the side wall W2 of the cylinder W, the corner W3 of the cylinder W is pressed outward (arrow N direction). Thereby, the side wall part W2 of the cylindrical body W12 with the bead group curved after the bead processing is formed into a flat shape and reformed.

  Next, the production of the cylinder W by the can molding device 5 is performed as follows. FIG. 17 is a view showing a ZZ cross section in FIG. 5 (D), and FIG. 17 (A) unformed cylinder W11 after welding, FIG. 17 (B) bead grouped cylinder after bead processing. W12, FIG. 17 (C) shows a cross section relating to the reformed cylinder W13 after the remodeling process. In FIGS. 17A to 17C, the two-dot chain circles are enlarged views of the corner portion W3 of each cylindrical body W (W11, W12, W13).

FIG. 17A corresponds to the unformed cylinder W11 as a joint W5 by welding the longitudinal ends of the material plate P0 shown in FIG. 5B, and FIG. This corresponds to the bead group-attached cylinder W12 in which the bead group B is formed by the inner and outer bead rollers 11 and 12 on the unformed cylinder W11 shown in FIG. FIG. 17C corresponds to a cylindrical body W (W13) in which the bead group-attached cylindrical body W12 is reformed by being pressed by the inner reforming roller 21 and the outer reforming roller 22.
Reform by the reform unit 3 is sequentially performed on the bead group-attached tubular body W12 transported by the transport device 1 without temporarily stopping the transport device 1.
In the first embodiment, after the bead group processing and reforming are completed on the cylindrical body W (FIG. 17C), the horizontal bead C is molded by the press device 6.
After molding the horizontal bead C, the top plate WT and the bottom plate WB are attached to the openings at both ends.
In addition, when it reforms before shape | molding the horizontal bead C, FIG.5 (D) respond | corresponds with FIG.17 (B) and FIG.17 (C).

  According to the can molding device 5, the side wall W <b> 2 of the cylindrical body W transported by the transport device 1 is sandwiched between the inner bead roller 11 and the outer bead roller 12, and the cylindrical body W is transported by the transport device 1 by the inner and outer bead rollers 11, 12. The bead group B can be formed efficiently.

  In addition, according to the can production line 1, since the bead group B is reformed after forming the bead group B on the side wall W2 of the unformed cylinder W11, the bead group B is easily molded, The side wall portion W2 can be reformed efficiently. Then, since the horizontal bead C is shape | molded with the press apparatus 6, the horizontal bead C can be shape | molded stably.

Next, with reference to FIG. 18, the manufacturing method of the square can 10 which concerns on 2nd Embodiment of this invention is demonstrated. The square can W10 is the same as that of the first embodiment. FIG. 18 is a diagram illustrating an outline of a manufacturing process of a polygonal can according to the second embodiment.
(1) First, as shown in FIG. 18A, the material plate P0 is formed into a shape corresponding to the cylindrical body.
(2) Next, as shown in FIG. 18B, the formed material plate material P0 is pressed to form the respective side wall shape portions D in the regions corresponding to the respective side wall portions W2.
(3) Next, as shown in FIG. 18 (C), it is bent so as to correspond to the cylindrical body, and both ends of the body are opened, and the opposite sides are joined as a joint W5.
(4) A cylindrical body W as shown in FIG. 18D is formed by (1) to (3).
Thereafter, the top plate WT and the bottom plate WB are connected to the cylindrical body W by caulking or the like.

  According to the method for manufacturing the rectangular can 10 according to the second embodiment, the side wall shape portion of each side wall portion is formed by press working, so that, for example, there is a taper between one opening portion and the other opening portion and the opening size. Even if the shapes are different, the side wall shape portion can be easily and efficiently formed. Moreover, even if the side wall-shaped portion includes a horizontal bead, the side wall-shaped portion can be formed.

Next, with reference to FIG. 19, the modification of the bead group which comprises the side wall shape part which concerns on this invention is demonstrated. FIGS. 19A to 19E are diagrams showing modifications of the bead group B. FIG.
FIG. 19A is a diagram illustrating a first modification of the bead group. The bead group B10 according to the first modified example includes a convex portion B11 that protrudes outward from the corner portion W3 in order and that has both sides sandwiching the apex of a substantially obtuse isosceles triangle, and an inwardly approximately obtuse angle. And a concave portion B12 composed of sides on both sides of the top of the isosceles triangle.

  FIG. 19B is a diagram illustrating a second modification of the bead group. The bead group B20 according to the second modification includes an indentation inwardly arranged in order from the corner portion W3 side, and a recess B21 composed of sides on both sides sandwiching the apex of a substantially obtuse isosceles triangle, and a recess B22. .

  FIG. 19C is a diagram illustrating a third modification of the bead group. The bead group B30 according to the third modified example has a convex portion B31 that protrudes outward from the corner portion W3 and protrudes outward from the corner portion W3, and has both sides sandwiching the top of a substantially obtuse isosceles triangle, and protrudes outward and has a substantially obtuse angle. And a convex portion B32 composed of sides on both sides of the top of the isosceles triangle.

  FIG. 19D is a diagram showing a fourth modification of the bead group. The bead group B40 according to the fourth modification includes a channel-type convex portion B41 projecting outward from the corner portion W3 and a channel-type convex portion B42 projecting outward. .

  FIG. 19E is a diagram showing a fifth modification of the bead group. The bead group B50 according to the fifth modification includes a channel-type recess B51 that is inwardly disposed in order from the corner W3 side, and a channel-type protrusion B52 that protrudes outward. .

19A to 19E, the strength of the side wall W2 of the square can W10 can be efficiently improved. Further, by connecting the top of the bead with an obtuse angle or a curve, molding can be facilitated, and stress corrosion cracking and rust resistance during long-term storage after filling the contents can be suppressed. Further, by projecting the bead on the corner W3 side outward, contact and friction on the surface of the side wall W2 during transportation are suppressed, and as a result, damage to the flat part of the side wall W2 and the label is less likely to occur. be able to.
Further, by forming a group of beads by projecting a plurality of beads outward, it is possible to more reliably suppress contact between flat portions with other rectangular cans W10 during transportation.

Next, with reference to FIG. 20, a square can W10A according to a first modification of the horizontal bead constituting the side wall-shaped portion according to the present invention will be described.
The first modification differs from the first and second embodiments in that one horizontal bead C11 is formed on each of the upper and lower sides of the cylindrical body W, and the cross-section in the vertical direction of the horizontal bead C11 sandwiches the apex and the opening side is This is a configuration in which the long obtuse triangle is configured as two sides, and the rest is the same as in the first and second embodiments, and thus the description thereof is omitted.

Next, with reference to FIG. 21, a square can W10B according to a second modification of the horizontal bead constituting the side wall-shaped portion according to the present invention will be described.
The second modification differs from the first and second embodiments in that one horizontal bead C12 is formed on each of the upper and lower sides of the cylindrical body W, and the side in which the cross-section in the vertical direction of the horizontal bead C12 sandwiches the apex is substantially The obtuse angle isosceles triangle has two sides, and the rest is the same as in the first and second embodiments, and the description thereof is omitted.
According to the horizontal beads C11 and 12 according to the first modification and the second modification, it can be easily molded while ensuring the design and strength.

Next, with reference to FIG. 22, a modified example of the inner reforming roller and the outer reforming roller of the can forming apparatus according to the present invention will be described.
The inner reforming roller and the outer reforming roller shown in FIG. 22 include an inner reforming roller 121 and a modified example 122 of the outer reforming roller. For example, the inner reforming roller 121 is formed with a concave shape portion 121C, a flat shape portion 121D, and a molding shape portion 121B having a convex shape portion 121E for forming the concave portion B1, the flat portion B2, and the convex portion B3 of the bead group B. It rotates around the axis 121A.
Further, the inner reforming roller 122 is formed with a convex shape portion 122C for forming the concave portion B1, the flat portion B2, and the convex portion B3 of the bead group, a flat shape portion 122D, and a molding shape portion 122B having a concave shape portion 122E. It is configured to rotate around the axis 122A.
With this configuration, the bead group can be molded while reforming, and the production efficiency can be improved.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, the polygonal can has been described, for example, in the case where the side wall W2 having end plates connected to both openings of the cylindrical body W is a rectangular 18 liter square shape. The present invention may be applied to polygonal cans other than quadrangular cans such as cans and octagonal cans, and the shape of the side wall may be arbitrarily set, such as a trapezoid. That is, for example, the number of side walls, the shape of the side walls, whether it is a regular polygon, the internal capacity of the polygonal can, and whether the end plate is connected to one opening or both openings are arbitrarily set. May be.

  Moreover, in the said embodiment, the side wall shape part D adjoins the corner part W3 on either side of the side wall part W2, and is symmetrical with the center of the side wall part W2, and two bead groups B and B and two bead groups B, B Although the case where it comprised from two horizontal beads C arrange | positioned between was demonstrated, for example, the number of bead groups, the shape when a bead group is seen from the side, the arrangement of bead groups in the vertical direction, the vertical direction of the bead groups The lateral displacement of the side wall W2 with respect to can be set arbitrarily. Further, the position, shape, and number of the horizontal beads C can be arbitrarily set, and the horizontal beads C may not be provided.

  Moreover, in the said embodiment, the side wall shape part D provided with two bead groups B symmetrical to the side wall part W2 and two horizontal beads symmetrically in the vertical direction of the side wall part W2 is provided on all the side wall parts W2. Although the case where it forms is demonstrated, it is not necessary to form the side wall shape part D in all the side wall parts W2, and the side wall shape part D formed in each side wall part W2 does not need to be the same. For example, the side wall shape portion D is used for a portion where sufficient strength is ensured without the bead group B, such as the vicinity of the corner portion W3 by the joint portion W5 between the opposite sides of the material plate formed corresponding to the cylindrical body W. However, it is good also as the side wall shape part D which does not provide the bead group B in the junction part W5 side, or the side wall shape part D provided with the bead group B which is different in right and left, without providing the symmetrical bead group B of the side wall part W2.

  Moreover, the bead group which comprises the side wall shape part D may set arbitrarily other than what was shown in FIG. 19, for example. Each bead group and each bead may be formed from the opening to the opening, or one or both may be formed to a position separated from the opening. A plurality of bead groups may be arranged in the vertical direction, and a plurality of beads constituting the bead group may be arranged in the vertical direction.

In the first embodiment, the horizontal bead C is formed into a cylinder W by processing the bead group B on the unformed cylinder W11, reforming, and pressing, and then the top plate WT and the bottom plate WB are formed. Although the case where the rectangular can W10 is manufactured by connection has been described, for example, after forming a group of beads, a horizontal bead is formed by press processing, and then reformed.
Moreover, in 2nd Embodiment, after forming all the side wall shape parts D in the material board material, it was set as the cylinder W, and after that, the case where the top plate WT and the baseplate WB were connected was demonstrated. Join the opposite sides of the corresponding material plate to form a cylindrical body with both ends open, and insert a core mold (corner forming member) corresponding to the corner of the cylindrical body into this cylindrical body A cylindrical portion is formed by moving the cylindrical body outward in the radial direction to form an unformed cylinder W11.
Next, the side wall portion W2 is pressed by an inner mold disposed inside the unmolded cylinder W11 and an outer mold disposed outside, thereby forming a side wall shape portion D on each side wall portion W2.
Thereafter, the top plate WT and the bottom plate WB may be connected to the opening of the cylindrical body W to form a square can. In this case, a known technique can be applied.
As a result, the cylindrical body W can be formed efficiently. Moreover, since a side wall shape part is shape | molded by press work, the square can W10 can be manufactured efficiently.

  For example, in the above embodiment, the case where the can molding device 5 includes the bead molding unit 2 and the reform unit 3 has been described. For example, the bead molding unit 2, the press device 6, and the reform unit 3 are arranged in this order. May be. Moreover, it is good also as a structure provided with the reform function in the inside of the bead molding unit 2. FIG. Further, the number of steps of the bead forming roller and the number of steps of the reforming roller may be set arbitrarily.

  Moreover, in the said embodiment, although the case where the material of a polygonal-shaped can was a steel plate was demonstrated, it cannot be overemphasized that what uses materials other than steel plates, such as a copper plate, a brass plate, an aluminum plate, is contained, for example. Absent.

Next, the effect of this invention is demonstrated with reference to Examples 1-4.
The compressive strength test (Example 1) is based on the results of Invention Examples 1 to 4 and Comparative Examples 1 to 3, the storage test (Example 2), the transport test (Example 3), and the unloading test (implemented). Example 4) shows the results for Example 2 of the invention.

  In the present invention example 1, the can body is formed of tin-free steel with a tempering degree T-4 (JISG3315, hereinafter the same) with a plate thickness of 0.30 mm, and is symmetric with respect to the center of each side wall portion of the can body. A rectangular can having a pair of vertical beads extending therebetween.

  In Invention Examples 2 to 4, the can body has a tempering degree T of 0.27 mm (Invention Example 2), 0.30 mm (Invention Example 3), and 0.32 mm (Invention Example 4). -4 tin-free steel, symmetric about the center of each side wall of the can body, a pair of vertical beads extending between the upper and lower openings, and a horizontal bead in the vicinity of the upper and lower openings Square shaped can.

  The comparative example is a tin-free steel with a tempering degree T-4 having a thickness of 0.27 mm (Comparative Example 1), a thickness of 0.30 mm (Comparative Example 2), and a thickness of 0.32 mm (Comparative Example 3). It is a quadrangular can that is formed and has a rectangular portion formed at the center of each side wall portion of the can body.

[Example 1]
(1) Compressive strength test The maximum load when the can was compressed from above and below was measured as the compressive strength. The pressurization was performed for each of the inventive examples and the comparative example n = 5 while supporting the upper and lower winding tightening portions.
In the compressive strength test, (1-1) an empty can test for empty cans and (1-2) a reduced pressure can test for reduced pressure cans were performed. Here, the reduced pressure can test is a can filled with the contents (for example, seasoning, soy sauce, animal oil, paint, additives / auxiliaries) at a high temperature, and the inside of the can is in a reduced pressure state as the temperature decreases. Since the buckling (dentation, crushing) is likely to occur during storage in a warehouse, the compression strength of the can in a reduced pressure state is evaluated. In the example, 15 kg of 80 ° C. hot water was filled in an 18 L can, and after mounting the cap, the pressure was reduced by cooling to 20 ° C., and the compressive strength was measured. In addition, the reduced pressure value in a reduced pressure can test is 9-11 kPa with a vacuum canister.
Hereinafter, Example 1 is divided into (1-1) an empty can test for empty cans and (1-2) a reduced pressure can test for reduced pressure cans.

(1-1) Empty can test for empty cans

(1-2) Vacuum can test for vacuum cans

  According to Example 1, the average value of the compressive strength of Example 1 of the present invention having only vertical beads was 14.1 kN for an empty can and 10.2 kN for a reduced pressure can, whereas a steel plate having the same thickness was used. In Comparative Example 2 having the rectangular portion used, it was 11.5 kN for the empty can and 7.3 kN for the decompression can. Thus, the average value of the compressive strength of Example 1 of the present invention was significantly improved to 22.6% for the empty can and 39.7% for the reduced pressure can as compared with Comparative Example 2.

  Moreover, the average value of the compressive strength of the present invention example 2 having the vertical bead and the horizontal bead was 12.2 kN in the empty can and 9.2 kN in the decompression can, whereas the steel plate having the same thickness was used. In Comparative Example 1 having a rectangular portion, the empty can is 10.3 kN and the reduced pressure can is 6.7 kN. The average compressive strength of Example 2 of the present invention is 18 in the empty can as compared with Comparative Example 1. .4%, and reduced pressure can significantly improved to 37.1%.

  Moreover, the average value of the compressive strength of Example 3 of this invention which has a vertical bead and a horizontal bead was 14.1 kN with an empty can, and 10.1 kN with a decompression can, On the other hand, the steel plate of the same thickness was used. In Comparative Example 2 having a rectangular shape portion, the empty can is 11.5 kN and the reduced pressure can is 7.3 kN. The average value of the compressive strength of Example 3 of the present invention is 22 in the empty can as compared with Comparative Example 2. It was significantly improved to 0.6% and 38.4% for the vacuum can.

  The average value of the compressive strength of Example 4 of the present invention having vertical beads and horizontal beads was 16.0 kN for the empty can and 11.3 kN for the reduced pressure can, whereas in Comparative Example 3, it was 12 for the empty can. 0.8 kN, 7.4 kN for the vacuum can, and the average value of the compression strength of Example 4 of the present invention is 25.0% for the empty can and 52.7% for the decompression can compared to Comparative Example 3. Improved.

As described above, Example 1 of the present invention having only vertical beads has a compressive strength of 25.0% for an empty can and 37.1% for a reduced pressure can, compared to Comparative Example 2 having a rectangular portion. Improved.
The strength of Example 1 of the present invention is sufficiently large as 10.1% for an empty can and 37.8% for a reduced pressure can even when compared with Comparative Example 3 having a plate thickness of 18.5% thick and 0.32 mm. There is a possibility that the steel plate will be significantly thinner and lighter.

  Moreover, this invention example 2-4 which has a vertical bead and a horizontal bead is 25.0% at a maximum with an empty can, and 52.7% at a maximum with a pressure reduction can with respect to the comparative examples 1-3 which have a rectangular shape part. . In this way, a particularly large effect is seen in a vacuum can that has more severe use conditions. As described above, since the compressive strength is greatly improved, there is a possibility that the steel plate will be significantly thinned (about 18%) and light in weight.

[Example 2]
(2) Storage test On the pallet, cans filled with 18.0 kg of water are stacked up and down in 4 rows x 5 rows (20 cans per stage), and 40 cans per pallet are loaded and arranged. Create a storage test pallet.
Storage test condition 1: Storage test pallets are stacked in three stages and stored for 5 weeks, and the cans loaded on the lowermost storage test pallet are checked for deformation.
Storage test condition 2: Four storage test pallets are stacked and stored for 5 weeks, and the cans loaded on the lowest storage test pallet are checked for deformation.

  According to Example 2, no deformation was observed in both storage test conditions 1 and 2, and the results were good.

[Example 3]
(3) Transport test Cans that have been confirmed to have no deformation after the storage test are stacked in 4 rows and 5 rows (20 cans per stage) on the pallet, and two cans are stacked on top and 40 cans per pallet. Create a pallet for transportation test.
Transport test conditions: A transport test pallet is loaded on a forklift, traveled at a distance of 300 m at a speed of 10 km / h and transported, and the can loaded on the lowermost transport test pallet is checked for deformation.

  According to Example 3, both the conveyance test conditions 1 and 2 showed no deformation, and the results were good.

[Example 4]
(4) Unloading test After confirming that there is no deformation after the transportation test, the cans were stacked in 4 rows and 5 rows (20 cans per stage) on the pallet in two stages, and 40 cans per pallet. Load and place to create an unloading test pallet.
Unloading test conditions: An unloading test pallet was loaded on a forklift, the unloading test pallet was raised to a height of 30 cm from the ground, then lowered by neutral, and loaded on the lowermost unloading test pallet. Check the can for deformation.

  According to Example 4, no deformation was observed in both unloading test conditions 1 and 2, and the results were good.

  INDUSTRIAL APPLICATION Since the polygonal can can improve the intensity | strength of a polygonal can by providing the side wall shape part which has a bead group in a side wall part, it can utilize industrially.

DESCRIPTION OF SYMBOLS 1 Conveying device 2 Bead forming unit 3 Reform unit 5 Can forming device 6 Press device 10 Bead roller set 11 Inner bead roller 11A Rotating shaft 12 Outer bead roller 12A Rotating shaft 15 Bead roller pressing mechanism 20 Reforming roller 21 Inner reforming roller 21A Rotating shaft 22 Outer reforming Roller 22A Rotating shaft P0 Material plate (material plate material)
W cylinder W1 axis W2 side wall W3 corner W10 square can W11 unformed cylinder W12 bead grouped cylinder W13 reformed cylinder WB bottom plate (end plate)
WT Top plate (end plate)
B, B10, B20, B30, B40, B50 Bead group B1, B3, B11, B12, B21, B22, B31, B32, B41, B42B51, B52 Bead C, C1, C2, C11, C12 Horizontal bead D Side wall shape part

Claims (14)

A polygonal can in which an end plate is joined to at least one of the opening portions of the cylindrical body in which a plurality of side wall portions are connected via corner portions and both ends are polygonal openings,
As for the said cylinder, a side wall shape part is formed in each said side wall part,
The side wall shape portion includes a bead group,
The bead group is formed between corner portions on both sides of the corresponding side wall portion, and includes a plurality of concave beads and convex beads extending along a direction from the one opening portion toward the other opening portion. Are arranged,
A polygonal can characterized by including a flat portion whose width and length are equal to or less than the width and length of adjacent beads. The polygonal can according to claim 1,
The bead group is
A polygonal can characterized in that it extends from the one opening to the other opening. The polygonal can according to claim 1 or 2,
The side wall shape part is
A polygonal can comprising two symmetrical bead groups at the center of the side wall in the width direction. The polygonal can according to claim 3,
The bead group is
A polygonal can comprising: a concave bead formed in order from the left and right corner portions; and a convex bead. The polygonal can according to claim 4,
The bead group is
A polygonal can comprising a flat portion formed between the concave bead and the convex bead. A polygonal can according to any one of claims 1 to 5,
The said cylindrical body is equipped with four side wall parts, The polygonal can characterized by the above-mentioned. The polygonal can according to any one of claims 3 to 6,
Each said side wall shape part is
A polygonal can comprising a lateral bead formed at a distance from each bead group between the left and right bead groups. It is a manufacturing method of the polygonal can according to any one of claims 1 to 6,
A material plate is formed into a shape corresponding to the cylindrical body,
Bending to correspond to the cylinder and opening both ends of the body portion to join the opposite sides to form a first cylinder,
An inner bead roller positioned inside the body portion of the first cylinder body while conveying the first cylinder body from one opening of the body portion toward the other opening, and the body portion of the first cylinder body The bead group is provided by cooperating and pressing an outer bead roller positioned outside and disposed so as to be opposed to the inner bead roller with the body portion interposed therebetween, while rotating against the side wall portion of the first cylindrical body. Forming the side wall shape part to form a cylinder,
A method for manufacturing a polygonal can, wherein an end plate is connected to at least one opening of the cylindrical body to form a polygonal can. It is a manufacturing method of the polygonal can according to any one of claims 1 to 7,
A material plate is formed into a shape corresponding to the cylindrical body,
Bending to correspond to the cylinder and opening both ends of the body portion to join the opposite sides to form a first cylinder,
An inner bead roller positioned inside the body portion of the first cylinder body while conveying the first cylinder body from one opening of the body portion toward the other opening, and the body portion of the first cylinder body The bead group is formed by cooperating and pressing an outer bead roller positioned outside and disposed so as to face the inner bead roller with the body portion interposed therebetween, while rotating against the side wall portion of the first cylindrical body. And the step of forming the horizontal bead by press working,
Forming the cylindrical body provided with the side wall-shaped portion by going through one of the steps and then going through the other step,
A method for manufacturing a polygonal can, wherein an end plate is connected to at least one opening of the cylindrical body to form a polygonal can. It is a manufacturing method of the polygonal can according to claim 8 or 9,
An inner reforming roller disposed on the front side in the transport direction with respect to the formation completion portion of the bead group by the inner bead roller and the outer bead roller and disposed on the inner side of the body portion, and disposed on the outer side of the body portion and the body portion. Reforming the reforming roller comprising an outer reforming roller disposed so as to be able to face the inner reforming roller while interposing it, revolving the cylindrical body by cooperating while rotating and pressing the corner portion of the body portion A manufacturing method of a polygonal can. It is a manufacturing method of the polygonal can according to any one of claims 1 to 7,
A material plate is formed into a shape corresponding to the cylindrical body,
Forming the side wall shape portions corresponding to the respective side wall portions by press working on the molded material plate,
Bend to correspond to the cylinder and open both ends of the body portion to join the opposite sides to form a cylinder,
A polygonal can manufacturing method, wherein an end plate is connected to at least one opening of the cylindrical body to form a polygonal can. It is a manufacturing method of the polygonal can according to any one of claims 1 to 7,
A material plate is formed into a shape corresponding to the cylindrical body,
Forming a cylindrical body having both ends opened by joining opposite sides of the material plate,
Inserting a corner molding member corresponding to the corner portion of the cylindrical body into the cylindrical body, moving the corner molding member radially outward of the cylindrical body to bend the corner portion into a cylindrical body,
By pressing the side wall portion with an inner mold arranged inside the cylindrical body and an outer die arranged outside, the side wall shape portion is formed on each side wall portion,
A polygonal can manufacturing method, wherein an end plate is connected to at least one opening of the cylindrical body to form a polygonal can. A can molding apparatus for manufacturing a polygonal can in which a plurality of side wall portions are connected via a corner portion and both ends are made into polygonal openings, and an end plate is joined to at least one of the openings. ,
A transport device for transporting the cylindrical body from one opening of the body toward the other opening;
An inner bead roller disposed inside the barrel portion of the cylindrical body conveyed by the conveying device, and disposed outside the barrel portion of the cylindrical body and disposed so as to be opposed to the inner bead roller across the side wall portion. An outer bead roller,
At least a pair of the inner bead roller and the outer bead roller are formed corresponding to a side wall shape portion including a bead group,
The bead group is formed between corner portions on both sides of the corresponding side wall portion, and includes a plurality of concave beads and convex beads extending along a direction from the one opening portion toward the other opening portion. Arranged and configured to include a flat portion whose width and length are equal to or less than the width and length of adjacent beads,
The inner bead roller and the outer bead roller cooperate with each other while rotating to press the side wall portion, thereby forming the side wall shape portion. The can molding apparatus according to claim 13,
A reforming roller for reforming the body portion of the cylindrical body is provided on the front side in the transport direction from the formation completion part of the bead group by the inner bead roller and the outer bead roller,
The reforming roller is
An inner reforming roller disposed on the inner side of the barrel portion of the cylindrical body, and an outer reforming roller disposed on the outer side of the barrel portion of the cylindrical body and disposed so as to be opposed to the inner reforming roller with the barrel portion interposed therebetween. And comprising
The can reforming apparatus, wherein the inner reforming roller and the outer reforming roller are configured to cooperatively press while rotating a corner portion of the body portion by a reforming roller pressing mechanism.

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