JP2018070213A - Pail can with concave bead and method for manufacturing pail can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pail can and a method for manufacturing a pail can which are less work process and have a simple and inexpensive constitution to secure the necessary counter sink while eliminating the gap between the outer edge of the bottom board and the can barrel.SOLUTION: The present invention includes a bottom board 21 having an inclination face formed around an outer edge (marginal part 26) of a disc-shaped metal plate, and a can body 20 formed in a cylindrical shape from a metal plate, a pail can 1 in which the inclination face and the lower end of the can body 20 are integrated by a seamed part 27 in which the can body is twisted, and an inner surface in the vicinity of the lower end of the can body 20 is recessed inwardly until it comes into close contact with the inclination face along the inclination and blocked the gap between the bottom surface of the can body 20 and the bottom board 21, the concave bead 24 is formed in the can barrel 20.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a metal pail for storing and transporting liquids or fluids such as lubricating oils, paints, solvents, and the like, and in particular, eliminates the gap between the outer edge of the bottom plate and the can body. Regarding pail cans.

  Conventionally, a metal pail can is known as a container for storing and transporting liquids or fluids such as lubricating oils, paints and solvents.

  For example, Patent Document 1 discloses a taper pail container 1 having a container body 2 having a tapered side wall (can body 20) and a bottom plate 21 and a handle 3 for carrying the container body 2. In this case, the side wall (can body 20) is formed with a belt-like convex portion extending in the horizontal direction such as a bead 23 to prevent deformation, and the handle 3 is attached to the side wall (can body 20). The ear part 4 that is swingably supported is attached, and the convex part (bead 23) is formed so that the lower end thereof is lower than the lower end of the ear part 4, and the convex part (bead 23). ) Discloses a taper pail container 1 in which a bypass portion 24 is formed so as to bypass the ear portion 4 in the vicinity of the ear portion 4 (claim 1, claim of the patent document 1) Book paragraph [0035], figure See Figure 3, etc.).

  Such a pail can includes a bottom plate 21 made of a disk-shaped metal plate and a can body (can body 20) formed in a cylindrical shape from the metal plate, and the inclined surface and the lower end of the can body are wound. It is integrated and joined at the tightened winding part. In addition, since the bottom plate 21 mechanically continuously performs the tightening process of the tightening portion, a disk-shaped metal is formed before the tightening process for the purpose of stacking a large number of sheets on a processing machine. An inclined surface is formed around the outer edge of the original plate.

  However, if it does so, as shown in FIG. 9, the gap resulting from this inclined surface will be formed between the bottom plate 21 and the can body 20 after the winding process. This gap has a problem that dust accumulates during transportation and storage of the pail can.

  In particular, pail cans are determined according to JIS standards such as a steel plate thickness of 0.3 mm to 0.5 mm, an inner diameter of 272 mm to 286 mm, etc., and a capacity of 18 L or 20 L, etc. Since the plate thickness is thin compared to the weight of the contents and the diameter of the can body is large, the counter sink, which is the height (depth) from the winding part to the bottom plate, is increased (generally 10 mm or more). There is a need. For this reason, the clearance gap between the bottom plate formed in the upper part of a winding part and a can body became large, and the said problem was remarkable.

  In addition, the dust accumulated in the gaps can increase the product yield for manufacturers who manufacture products that require precision or cleanliness, such as semiconductors and cosmetics, using liquid raw materials contained in pail cans. Thorough cleaning of the pail can was necessary because it would be a worsening factor.

  Moreover, in patent document 2, the inner bag which accommodated the resin inner container 110 in the steel container for the purpose of providing the inner bag composite container which can reduce a residual liquid amount and its variation compared with the past. In the composite container 100, the inlet / outlet part 111 of the inner container is located on the central axis 101 of the inner bag composite container, and the inner container collects and stores the residual liquid immediately below the inlet / outlet part on the central axis. An inner bag composite container having a concave portion 113 is disclosed (see claim 1 of patent document 2, paragraphs [0015] to [0022] of the specification, FIGS. 5 and 6 of the drawings, etc.) .

  However, although the inner bag composite container described in Patent Document 2 has no gap for collecting dust, it is extremely complicated to manufacture the inner container 110 made of resin in addition to the pail can and to seal these two containers. There was a problem that the unit price of the product was high because it was necessary to work with many work processes.

Japanese Patent No. 5903185 JP 2014-24603 A

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to secure the necessary countersink with a simple and inexpensive configuration with a small number of work steps and to secure the outer edge of the bottom plate and the can. It is an object of the present invention to provide a pail can and a method for manufacturing a pail can with no gap between the body and the body.

  A pail can with a concave bead according to a first aspect of the present invention includes a bottom plate formed with an inclined surface around an outer edge of a disk-shaped metal plate, and a can body formed into a cylindrical shape from the metal plate, the inclined surface And the lower end of the can body are integrated in a tightened portion, and the inner surface near the lower end of the can body is inward until it adheres along the inclination of the inclined surface. A concave bead that is recessed to close a gap between the bottom plate and the bottom plate is formed in the can body.

  The pail can with a concave bead according to the second invention is characterized in that, in the first invention, a counter sink, which is a distance from the lower end of the tightening portion to the bottom plate, is 10 mm or more.

  The pail can with a concave bead according to the third invention is characterized in that, in the first invention or the second invention, the inclination angle of the inclined surface is 70 degrees or more and 85 degrees or less.

  A pail can with a concave bead according to a fourth aspect of the present invention is the pail can according to any one of the first to third aspects, wherein the can body and the bottom plate are formed of a steel plate having a thickness of 0.3 mm or more and 0.5 mm or less. It is characterized by.

  A pail can with a concave bead according to a fifth aspect of the present invention is the pail can according to any one of the first to fourth aspects of the present invention, wherein the can body has a convex bead with a circumferential surface protruding outward, and the inside of the convex bead The maximum inner diameter is formed to be 286 mm or more.

  A method for manufacturing a pail can according to a sixth aspect of the present invention is to integrally wind an inclined surface formed around an outer edge of a bottom plate made of a disk-shaped metal plate and a lower end of a can body made of a cylindrical metal plate. The pail can manufacturing method includes a concave bead forming step of forming a concave bead in which the vicinity of the lower end of the can body is recessed inward so as to contact along the inclination of the inclined surface. .

  According to a seventh aspect of the present invention, there is provided a pail can manufacturing method according to the sixth aspect of the invention, wherein the concave bead forming step is performed simultaneously with winding by a winding roll for tightening the bottom plate and the can body.

  According to an eighth aspect of the present invention, there is provided a method for manufacturing a pail can according to the seventh aspect of the present invention, in the concave bead forming step, a counter sink that is a distance from a lower end of the tightening portion to the bottom plate is secured to 10 mm or more. The concave bead is formed while tightening the bottom plate and the can body.

  According to the first to eighth inventions, the can body is formed with a concave bead that is recessed inward until the inner surface near the lower end of the can body adheres along the inclination of the inclined surface and closes the gap between the bottom plate and the can body. Therefore, it is possible to eliminate a gap between the outer edge of the bottom plate and the can body with a simple and inexpensive configuration with few work steps. Further, since there is no gap between the bottom plate and the can body, the pail can can be easily cleaned, and it is not necessary to clean it every time it is transported, so that the number of times of cleaning can be reduced.

  Further, according to the first to eighth inventions, since the concave bead is formed on the can body, not only the can body strength is simply improved by the bead, but also the tightening portion between the bottom plate and the can body is in close contact. Therefore, even if the pail can falls in a heavy state filled with the contents, the risk of opening the tightening portion can be reduced.

  In particular, according to the second invention, since the counter sink is 10 mm or more, the necessary counter sink required for the pail can is secured, and even if it is dropped with the contents of 18L or 20L put in, it can withstand. It is possible to eliminate the gap between the outer edge of the bottom plate and the can body while ensuring the required strength.

  In particular, according to the third invention, since the inclination angle of the inclined surface of the edge portion of the bottom plate is not less than 70 degrees and not more than 85 degrees, a plurality of bottom plates can be stored in a stacked manner. For this reason, the space for storing the members can be saved, and automatic supply of the bottom plate by the machine is facilitated when the can body and the bottom plate are tightened.

  In particular, according to the fourth and fifth inventions, a pail can conforms to the JIS standard while ensuring a predetermined strength, and a gap between the outer edge of the bottom plate and the can body can be eliminated.

  In particular, according to the seventh invention, the concave bead forming step is performed simultaneously with the tightening roll for tightening the bottom plate and the can body, so that the working time of the concave bead forming step is reduced, and a pail can is manufactured. Time can be shortened. For this reason, the manufacturing cost of a pail can can further be reduced.

  In particular, according to the eighth invention, the gap between the outer edge of the bottom plate and the can body can be eliminated by securing the bottom plate and the can body while securing the necessary counter sink required for the pail can.

It is a perspective view which shows the pail can with a concave bead which concerns on embodiment of this invention. It is the front view which showed the pail can same as the above. It is the AA sectional view taken on the line AA of the pail can of FIG. It is a B section expanded sectional view expanding and showing B section near the coiling part of a pail can same as the above. FIG. 3 is a plan view showing the pail can of FIG. 2 as viewed from above. It is drawing which shows the ear | edge part of a pail can same as the above, (a) is an enlarged front view, (b) is a horizontal sectional view. It is a flowchart which shows each process of the manufacturing method of the pail can which concerns on embodiment of this invention. It is process explanatory drawing which shows the winding process which winds the winding part of a pail can with a winding roll. It is a partial expanded vertical sectional view which shows the winding part of the conventional pail can.

  Hereinafter, an embodiment for carrying out a pail can according to the present invention will be described in detail with reference to the drawings.

[Pail can with concave bead]
First, a pail can with a concave bead according to an embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view showing a pail can with a concave bead according to an embodiment of the present invention, FIG. 2 is a front view of the pail can of FIG. 1, and FIG. 3 is a vertical view of the pail can of FIG. It is an AA line sectional view cut and shown in a section.

  As shown in FIGS. 1 to 3, a pail can 1 with a concave bead according to an embodiment of the present invention includes a steel container body 2, a handle 3 for carrying the container body 2, and the like. This is a bucket-shaped lidless (open) pail can used as a container for storing and transporting contents after the container body 2 is filled with contents such as liquid or fluid.

  In addition, in order to be able to stack and accumulate the pail cans before filling the contents, a taper pail can formed by gradually increasing the diameter as it goes upward will be described as an example. The present invention can also be applied to a pail can.

<Container body>
As shown in FIGS. 1 to 3, the container body 2 is composed of a substantially cylindrical can body 20 that is a body portion of the container body 2, and a disk-shaped steel plate that is fastened and fixed to the lower end of the can body 20. It consists of a bottom plate 21 and the like.

(Can body)
The can body 20 is roll-formed from a thin rectangular steel plate of about 0.3 mm to 0.5 mm, and the rectangular ends are joined to each other by seam welding or the like and formed into a cylindrical shape. It is a cylindrical body formed so as to gradually expand in diameter as it goes.

  As shown in FIGS. 1 to 3, the can body 20 has an inner diameter of the upper end opening of 285 mm and an inner diameter of the lower end opening of 272 mm. Tapered to increase as you go.

  In addition, as shown in FIG. 3, the edge of the upper end of the can body 20 is formed with a spin curl or the like so as not to expose the sharp end of the cut steel plate and to improve the bending strength of the upper end. A curled edge 22 that is rolled and rounded is formed.

(Convex bead)
As shown in FIGS. 1 to 3, the can body 20 is increased in strength to prevent deformation of the container such as a dent when the container body 2 is filled with the contents and conveyed. For this purpose, two convex beads 23 that protrude in a corrugated (corrugated) shape to the outside of the container body 2 are formed along the horizontal direction.

  As shown in FIG. 3, the convex bead 23 has a maximum inner diameter D1 of 286 mm which is the distance between the tops of the upper convex beads 23. The maximum inner diameter D1 of the convex bead 23 is also the maximum inner diameter of the can body 20.

(Concave bead)
FIG. 4 is an enlarged cross-sectional view of a B portion showing the B portion of FIG. As shown in FIGS. 3 and 4, the can body 20 is formed with a concave bead 24 that is recessed inward until the inner surface near the lower end is in close contact with the inclined surface of the edge 26 of the bottom plate 21 described later. . For this reason, the strength and rigidity in the vicinity of the bottom of the can body 20 are also enhanced.

(Bottom plate)
FIG. 5 is a plan view showing the pail can of FIG. 2 as viewed from above. As shown in FIG. 5, the bottom plate 21 is made of a thin disc-like steel plate similar to the can body 20, and in order to ensure bending rigidity, the bottom plate 21 is a ring-shaped 3 that is curved and protrudes upward in a corrugated shape. Two ring-shaped beads 25 are formed.

  Further, as shown in FIG. 4, the edge portion 26 around the outer edge of the bottom plate 21 is bent downward to form an inclined surface inclined at an inclination angle α, and the winding portion 27 is connected to the lower end edge of the can body 20. It is rolled up and integrated. This inclined surface is formed around the outer edge of the base plate of the bottom plate 21 for the purpose of accumulating a large number of sheets in order to mechanically continuously perform the tightening process of the tightening part 27 before the tightening process. Is done. For this reason, it is easy to store a plurality of the bottom plates 21 in a stacked manner, and the space for storing the members can be saved.

  In addition, the inclination angle α (angle formed with the horizontal plane) of the inclined surface of the illustrated edge portion 26 is set to 78 degrees. Of course, the inclination angle α can be set as appropriate. However, if the tilt angle is too tight and close to 90 degrees, when a large number of sheets are stacked, the bottom plate 21 cannot be supplied (sucked) one by one to the machine, which may cause a problem. For this reason, in general, the inclination angle α is about 70 to 85 degrees (the angle formed with the vertical plane is 5 to 20 degrees). By setting the inclination angle α to 70 to 85 degrees, automatic supply of the bottom plate 21 by a machine is facilitated when the can body 20 and the bottom plate 21 described later are wound up.

  Moreover, as shown in FIG. 4, the counter sink C1 which is the distance from the lower end of the winding part 27 to the lower surface of the bottom plate 21 is 10 mm or more. For this reason, in a pail can in accordance with the JIS standard, it is possible to ensure the strength that can be withstood even if the pail can is dropped with the 18L or 20L content required for the pail can.

  And, as shown in FIG. 4, the concave bead 24 described above dents the inner surface near the lower end of the can body 20 along the inclination of the inclined surface of the edge portion 26, so that the bottom plate 21 and A gap between the can body 20 and the can body 20 is closed (see also FIG. 9). For this reason, while being able to wash | clean the pail can 1, it becomes unnecessary to wash | clean each time of conveyance and the frequency | count of washing | cleaning can be reduced.

  Moreover, since the bending rigidity of the lower part of the can body 20 is reinforced by the concave bead 24 and the bottom plate 21 and the can body 20 are closely adhered to each other with no gap, the content reaching the pail can 1 reaches 18L to 20L. Even when the impact load when falling in a state of being filled with an object acts on the tightening portion 27, it can withstand the impact, and the possibility that the tightening portion 27 comes off or breaks is reduced.

<Handle>
As shown in FIGS. 1 and 2, the handle 3 includes a handle body 30 made of a steel wire (steel bar), and a cylindrical grip 31 made of a resin material fitted on the handle body 30. The container body 2 is fixed to the container body 2 by a later-described ear portion 4 which is a cup-shaped steel fitting.

<Ear part>
As shown in FIG. 6, the ear part 4 is attached to the ear part main body 40 formed in a cup shape from a thin steel plate similar to the can body 20 and the left and right side parts of the ear part main body 40. The welding rod 41 is used for welding with the can body 20. Further, a handle hole 42 is formed in the center of the ear part main body 40 so as to swing the handle main body 30 in a swingable manner.

  According to the pail can with a concave bead according to the embodiment of the present invention described above, with a simple and inexpensive configuration, the strength that can be endured even if it is dropped with the contents of 18L and 20L required for the pail can put in While ensuring, the clearance between the outer edge (edge 26) of the conventional bottom plate 21 and the can body 20 can be eliminated (see FIG. 9). Further, since there is no gap between the can body 20 and the bottom plate 21, the pail can 1 can be easily cleaned. For example, it is possible to obtain a clean state free from dust and dirt simply by blowing away unnecessary objects such as dust inside the pail can 1 with compressed air or the like. For this reason, while being able to wash | clean the pail can 1, it becomes unnecessary to wash | clean each time of conveyance and the frequency | count of washing | cleaning can be reduced.

[Method for producing pail can with concave bead]
Next, the manufacturing method of the pail can which concerns on embodiment of this invention is demonstrated. A case where the pail can 1 with concave beads according to the above-described embodiment of the present invention is manufactured will be described as an example.

(Can body forming process)
In the method for manufacturing a pail can according to this embodiment, first, a can body forming step of forming a can body from a rectangular steel plate is performed. Specifically, a thin rectangular steel plate is roll-formed, and ends are joined together by seam welding or the like to form a cylindrical shape. Thereafter, one end portion of the cylindrical body is expanded in diameter with an expander or the like to form the can body 20 described above. Further, it is preferable to form the above-described two convex beads 23 during the roll forming.

(Bottom plate forming process)
Next, in the manufacturing method of the pail can which concerns on this embodiment, the baseplate formation process which forms a baseplate from a rectangular steel plate is performed. Specifically, the above-mentioned edge is obtained by punching a rectangular steel plate into a disk shape, rolling the above-described ring-shaped bead 25 on the punched disk-shaped bottom plate 21, and bending the outer peripheral edge while rotating it. 26 inclined surfaces are formed.

  Of course, it goes without saying that the order of the can body forming step and the bottom plate forming step may be reversed or performed in parallel.

(Tightening process)
Next, in the manufacturing method of the pail can which concerns on this embodiment, the winding process which winds and joins the edge of the lower end of the can body 20 and the edge part 26 of the baseplate 21 is performed. Specifically, as shown in FIG. 8, while rotating the can body 20 and the bottom plate 21, the can body 20 and the bottom plate 21 are tightened with a winding roll X to perform a winding process, thereby forming the above-described winding section 27.

(Concave bead forming process)
At this time, unlike the conventional winding roll X ′ indicated by the one-dot chain line, the jaw X1 is formed on the winding roll X in the method for manufacturing a pail can according to this embodiment. For this reason, the concave bead formation process which forms the above-mentioned concave bead 24 can be performed simultaneously with a winding process.

  In addition, by this step, the vicinity of the lower end portion of the can body 20 is recessed inwardly so as to be in close contact with the inclined surface of the edge portion 26 of the bottom plate 21, and between the edge portion 26 of the bottom plate 21 and the can body 20 that has been conventionally formed. The gap can be eliminated (see also FIG. 9).

  In addition, in this step, as shown in FIG. 8, the counter sink C1 which is the distance from the lower end of the winding part 27 to the lower surface of the bottom plate 21 is secured 10 mm or more, and the bottom plate 21 and the can body 20 are secured by the winding roll X. And the concave bead 24 is formed. Thereby, while ensuring the intensity | strength which can be endured even if it drops in the state which put the content of 18L or 20L calculated | required by the pail can, between the outer edge (edge part 26) and the can fuselage | body 20 of the conventional bottom plate 21 The gap can be eliminated.

  In addition, in the manufacturing method of the pail can which concerns on this invention, you may provide the concave bead formation process which roll-molds the concave bead 24 using a separate roll, after winding-wrapping. However, it goes without saying that it is better to simultaneously perform the tightening step and the concave bead forming step as in the method for manufacturing a pail can according to this embodiment.

(Ear part welding process)
Next, in the method for manufacturing a pail can according to the present embodiment, an ear part welding process for welding the ear part to the can body is performed. Specifically, the ear part 4 is installed at a predetermined position of the can body 20, and the welding rod 41 is welded with a welding gun.

(Handle mounting process)
And in the manufacturing method of the pail can which concerns on this embodiment, the handle mounting process which mounts the handle 3 in the handle hole 42 of the ear part 4 is performed. By the completion of this step, the method for manufacturing a pail can according to this embodiment is completed.

  According to the method for manufacturing a pail can according to the present embodiment described above, since the winding process and the concave bead forming process are simultaneously performed, not only the gap between the can body 20 and the bottom plate 21 can be eliminated, but also the concave shape. The working time of the bead forming process can be reduced and the manufacturing time of the pail can can be shortened. For this reason, the manufacturing cost of a pail can can further be reduced.

  As mentioned above, although the manufacturing method of the pail can with the concave bead and the pail can according to the embodiment of the present invention has been described in detail, the above-described or illustrated embodiment is an embodiment that is embodied in practicing the present invention. However, the technical scope of the present invention should not be construed in a limited manner.

  In particular, the term “pail can” is used, but the term “pail can” according to the present invention is used as a concept including a medium-sized drum can. In short, the pail can according to the present invention is for storing or transporting liquids or fluids such as lubricating oil, paints, solvents, etc., except for small metal containers for drinks that do not require a predetermined strength. It refers to a large metal container that requires a predetermined strength.

1: Pail can 2: Container body 20: Can body 21: Bottom plate 22: Curl edge (edge)
23: Convex bead 24: Concave bead 25: Ring bead 26: Edge (outer edge of bottom plate)
27: Winding part 3: Handle 30: Handle body 31: Grip hand 4: Ear part 40: Ear part body 41: Welding rod 42: Handle hole X: Winding roll X1: Jaw part X ': Conventional winding roll C1: Counter sink

Claims (8)

A bottom plate having an inclined surface formed around an outer edge of a disk-shaped metal plate; and a can body formed in a cylindrical shape from the metal plate, wherein the inclined surface and the lower end of the can body are wound together A pail can integrated with a winding part,
A concave bead is formed in the can body so that an inner surface near the lower end of the can body is recessed inward until the inner surface of the can body adheres along the inclination of the inclined surface to close the gap between the bottom plate and the can body. Pail can with concave bead. 2. The pail can with a concave bead according to claim 1, wherein a counter sink which is a distance from a lower end of the tightening portion to the bottom plate is 10 mm or more. 3. The pail can with a concave bead according to claim 1, wherein an inclination angle of the inclined surface is not less than 70 degrees and not more than 85 degrees. The pail can with a concave bead according to any one of claims 1 to 3, wherein the can body and the bottom plate are formed of a steel plate having a thickness of 0.3 mm or more and 0.5 mm or less. The said can body has the convex bead which the outer peripheral surface protruded outside, and the largest internal diameter in the convex bead is shape | molded by 286 mm or more. Pail can with a concave bead. In the manufacturing method of the pail can which winds and integrates the inclined surface formed around the outer edge of the bottom plate made of the disk-shaped metal plate and the lower end of the can body made of the cylindrical metal plate,
A method for manufacturing a pail can, comprising: a concave bead forming step of forming a concave bead in which the vicinity of the lower end of the can body is recessed inward so as to abut along the inclination of the inclined surface. The method for manufacturing a pail can according to claim 6, wherein the concave bead forming step is performed simultaneously with winding by a winding roll for winding the bottom plate and the can body. In the concave bead forming step, a counter sink, which is the distance from the lower end of the tightening portion to the bottom plate, is secured at least 10 mm, and the bottom bead and the can body are wound with the tightening roll while the concave bead is It forms, The manufacturing method of the pail can of Claim 7 characterized by the above-mentioned.

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