JP6484964B2 - Metal can with polyhedral wall - Google Patents

Description

  The present invention relates to a metal can having a high-strength polyhedral wall in a body portion, and more particularly, to a metal can having a polyhedral wall that hardly damages the joint portion even if the body portion has a joint portion such as a welded can.

As a conventional metal can of this type, for example, the one described in Patent Document 1 is known.
That is, a circumferential polyhedral wall composed of a large number of unit panels divided by convex boundary ridge lines is provided on the body. This polyhedral wall has a configuration in which panel rows of a predetermined number of unit panels arranged in the can axis direction are densely arranged on the entire circumference, and the phase in the can axis direction of each unit panel in the adjacent panel row is the unit panel's phase. Each unit panel of the other panel row is densely inserted between each unit panel constituting one panel row of adjacent panel rows, shifted by half the axial length.
Thus, the strength is increased by making the body portion a polyhedral wall, and the thickness and weight are reduced without impairing the strength.
On the other hand, such a three-dimensional shape pattern composed of a large number of unit panels has a decorative effect. In particular, the large number of unit panels reflect light and shine brightly and have a unique appearance. .

JP-A-8-26286

  However, the polyhedral wall formed in the body part has a structure in which the unit panel is recessed and the boundary ridge line is bent outward, and has an unevenness in the axial direction. Although it is suitable, when it is applied to a three-piece can, the joint portion is bent, so that the joint portion may be defective and leakage may occur.

  The present invention has been made in order to solve the above-described problems of the prior art, and the object of the present invention is to form a joint portion at the time of polyhedral wall processing even if there is a joint portion in the body portion like a three-piece can. It is an object of the present invention to provide a metal can having a polyhedral wall having a structure that is not easily damaged.

In order to achieve the above object, the present invention provides:
The body has a circumferential polyhedral wall at least in the can axis direction, and the polyhedral wall has a large number of unit panels divided by convex boundary ridge lines, and the large number of unit panels are in the can axis direction. The panel rows of a predetermined number of unit panels arranged in a row are arranged densely all around, and the phase in the can axis direction of each unit panel in the adjacent panel row is only half of the length in the can axis direction of the unit panel Staggered, next to each other
Each unit panel of the other panel row is in between the unit panels constituting one panel row of the other panel row,
The unit panel has a rhombus shape, and has a concave valley line provided along a diagonal in the horizontal direction, and an upper triangular part and a lower triangular part provided above and below the valley line as a boundary, with the valley line as a boundary. In the metal can that is recessed concavely with respect to the diagonal in the can axis direction so that the upper triangle part and the lower triangle part bend ,
The body portion has a joint portion extending in the can axis direction for joining the body blank, and the position of the joint portion is shifted in the circumferential direction with respect to the position of the top portion where the boundary ridge line and the valley line that constitute the unit panel intersect. It is characterized by.

Further, the present invention can be configured as follows.
1) Let the joint be a weld.
2) The polyhedral wall has a configuration in which panel rows of a predetermined number of unit panels arranged in the can axis direction are densely arranged on the entire circumference, and the phase in the can axis direction of each unit panel in the adjacent panel row is a unit panel. Each unit panel of the other panel row is closely inserted between the unit panels constituting one panel row of adjacent panel rows, and the joint portion is adjacent to each other. Place between the tops of the matching panel rows.
3) The joint is positioned on the midpoint of the boundary ridgeline.

Further , although not the invention described in the claims , as another means for achieving the above object,
In a metal can having a polyhedral wall composed of a large number of unit panels having a circumferential polyhedral wall in at least a part of the can axis direction of the body portion, the polyhedral wall being divided by convex boundary ridge lines,
In the configuration in which the trunk portion has a joint portion extending in the can axis direction for joining the trunk blank,
An unprocessed region in which a panel row of unit panels is not provided in the can axis direction is provided at the position of the joint portion.

  Since the position of the joint portion is removed from the top portion having large unevenness and bending, it becomes difficult for the joint portion to be defective.

It is the schematic which shows the metal can which concerns on Embodiment 1, (a) is a front view, (b) is a longitudinal cross-sectional view, (c) is a cross-sectional view. (a) is a schematic perspective view which shows the processing machine which processes a polyhedral wall in Embodiment 1, (b) is a figure which shows a trunk | drum blank, (c) is the partial expanded sectional view of a processing state. It is the schematic which shows the metal can which concerns on Embodiment 2, (a) is a front view, (b) is a longitudinal cross-sectional view in an unprocessed part top position.

  DETAILED DESCRIPTION Exemplary embodiments for carrying out the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in this embodiment should be appropriately changed according to the configuration of the apparatus to which the invention is applied and various conditions. It is not intended to limit the scope to the following embodiments.

(Embodiment 1)
The first embodiment will be described below.
As shown in FIG. 1, the metal can 1 is a three-piece can comprising a cylindrical body 2 and can lids 3 and 3 that are fastened and fixed to upper and lower openings of the body 2. A circumferential polyhedral wall 4 is provided on at least a part of 2. Prior to filling and sealing the contents of the metal can 1, the can lid 3 is previously wound and fixed on the lower opening, and after filling and sealing, the can lid 3 is wound and fixed on the upper opening.
The polyhedral wall 4 is composed of a large number of unit panels 5 divided by convex boundary ridge lines 51, and more specifically, a predetermined number of unit panels 5 arranged in the can axis direction (height direction). Panel rows 50 are arranged densely all around.
The unit panel 5 has a rhombus shape, and the phase in the can axis direction of each unit panel 5 in the adjacent panel row 50 is shifted by half the axial length of the unit panel 5, and one panel row 50 in the adjacent panel row 50. The unit panels 5 of the other panel row 50 are densely inserted between the unit panels 5 constituting the.
The unit panel 5 is provided with a valley line 52 along a horizontal diagonal line, and is recessed in the diagonal direction in the can axis direction so that the upper triangle part 53 and the lower triangle part 54 are bent at the valley line 52 as a boundary.

The trunk | drum 2 is the structure which has the junction part 7 extended in a can axis direction, and the position which the position of the junction part 7 shifted in the circumferential direction with respect to the position of the top part 55 where the boundary ridgeline 51 which comprises the unit panel 5 cross | intersects It has become.
In this embodiment, the joint portion 7 is a welded portion, but is not limited to welding, and may be configured to be joined using an adhesive such as solder.
The joint portion 7 is disposed between the top portions 55 of the adjacent panel rows 50. In particular, it is located on the middle point of the boundary ridge line 51.

Here, an example of the processing method of the polyhedral wall 4 will be described with reference to FIG.
FIG. 2A is a schematic perspective view showing the processing machine 20 for processing the polyhedral wall 4, and a part of the body blank 10 is shown in a partial cross-section for explaining the inner mold 11.
The polyhedral wall 4 is processed by the processing machine 20 having the inner mold 11 and the outer mold 12 and applied to the cylindrical trunk blank 10 in a state before the can lid 3 is attached.
As shown in FIG. 2C, the body blank 10 is connected to the inner mold 11 such that the inner peripheral surface of the body blank 10 contacts the inner mold 11 and the outer peripheral surface of the body blank 10 contacts the outer mold 12. And the outer die 12 are set in the processing machine 20.
And when the inner mold | type 11 and the outer mold | type 12 rotate in the state which pinched | interposed the trunk | drum blank 10, the trunk | drum blank 10 is rotated in the circumferential direction, and stamping is performed by the inner mold | type 11 and the outer mold | type 12. Thus, the unit panel 5 is formed on the peripheral surface of the body blank 10 and the polyhedral wall 4 is processed.

In the processing machine 20, the inner mold 11 is provided with a protrusion 11 a for forming a boundary ridge line 51 that constitutes the unit panel 5, and the outer mold 12 is provided with a valley line 52 that constitutes the unit panel 5. A protrusion 12a is provided. Further, the inner mold 11 is provided with a recess 11 b that faces the protrusion 12 a of the outer mold 12, and the outer mold 12 is provided with a recess 12 b that faces the protrusion 11 a of the inner mold 11.
When taking a longitudinal section along the can axis direction, as shown in FIG. 2 (c), the unevenness difference of the longitudinal section shape passing through the apex 55 where the boundary ridge line 51 intersects is the largest, and the joint portion 7 is placed at this position. If placed, excessive stress is applied, and fine separation or the like occurs in the joint portion 7, which may cause leakage.

In the present invention, by avoiding the top portion 55 having the most severe unevenness, the stress applied to the joint portion 7 during processing is reduced to improve the reliability.
Although not shown in particular, when the body blank 10 is set, a known alignment is performed so that the positions of the projections 11a and 12a of the inner mold 11 and the outer mold 12 do not coincide with the position of the joint 7 of the body blank 10. Positioning is appropriately performed by the method.

( Reference example )
Next, a reference example will be described with reference to FIG.
In this reference example , an unprocessed region 8 in which the panel row 50 is not provided is provided at the position of the joint portion 7.
In the following description, parts different from those of the first embodiment will be described, and the same components are denoted by the same reference numerals and description thereof will be omitted.
As shown in FIG. 3A, the unprocessed region 8 is a portion where at least the unit panel 50 is not recessed, and in this reference example , the unit panel arranged along the joint 7 is not recessed. The unprocessed region 8 is formed, and the unprocessed region 8 is continuously formed.
As shown in FIG. 3A, when the unprocessed region 8 is provided in a row in the metal can 1 and the apex 55 ′ is formed by the boundary ridge line 51 of the adjacent panel rows 50, the apex 55 ′ is rounded and chamfered. It is preferable to apply corner treatment to the inner mold protrusion 11a as shown in FIG. 3 (b) so as to reduce the unevenness with the unprocessed region 8 by performing the treatment.

As shown in FIG. 3B, since the unevenness is almost eliminated in the unprocessed region 8, the defect of the joint 7 can be further reduced.
The position of the joint 7 may also be arranged at the midpoint of the boundary ridge line 51.
Furthermore, you may arrange | position the junction part 7 on the row | line | column of the unprocessed area | region 8 provided in multiple rows | lines.

DESCRIPTION OF SYMBOLS 1 Metal can 2 Body part 3 Can lid 4 Polyhedron wall 5 Unit panel 50 Panel row | line | column 51 Boundary ridgeline, 52 Valley line 53 Upper triangular part, 54 Lower triangular part 55, 55 'Top part 7 Joint part 8 Unprocessed area | region 10 Body blank 20 Processing machine 11 Inner mold, 11a protrusion, 11b depression 12 Outer mold, 12a protrusion, 12b depression

Claims (3)

It has a circumferential polyhedral wall at least in the can axis direction of the trunk,
The polyhedral wall has a large number of unit panels divided by convex boundary ridge lines, and the large number of unit panels have a panel array of a predetermined number of the unit panels arranged in the can axis direction on the entire circumference. In which the phase in the can axis direction of each unit panel in the adjacent panel row is shifted by half the length in the can axis direction of the unit panel, and each unit constituting one panel row in the adjacent panel row Each unit panel in the other panel row is closely packed between the panels,
The unit panel has a rhombus shape, and has a concave valley line provided along a diagonal line in the horizontal direction, and an upper triangle part and a lower triangle part provided above and below the valley line as a boundary, and the valley line In the metal can recessed in a concave shape with respect to the diagonal in the can axis direction so that the upper triangular portion and the lower triangular portion bend with the boundary as
In a configuration having a junction in which the body portion extends in the can axis direction joining the barrel blank, the circumferential direction with respect to the position of the top of the boundary edge and said valley line constituting the unit panel the position of the joint intersect A metal can having a polyhedral wall characterized by being shifted to   The metal can having a polyhedral wall according to claim 1, wherein the joint is a weld. 3. The metal can having a polyhedral wall according to claim 1, wherein the joint is located on a midpoint of the boundary ridge line.

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