JP2001009548A - Flange for container such as barrel and, manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange for container such as a barrel and, a manufacturing method thereof wherein an uniform coat of a plating or a painting is applied even to a collar peripheral bottom edge part of a flange for a container such as a barrel for preventing the contents of the container from being contaminated with a plating chip or a painting chip by making the coat of the plating or painting at a flange fitting part inner surface of the barrel not coming off when a plug is opened/shut. SOLUTION: This flange 1 for a container such as a barrel is provided with a collar part 3 which is polygons seeing from the plane at the bottom edge of a cylindrical part 2 having female screws 4 on an inner surface and, a peripheral bottom part 3a of the collar part 3 is made of a curved surface in almost circular arc shape in its cross section. As to a manufacturing method of the flange, an inner circular bottom edge of a collar part accommodation concave part, which being polygonal seeing from a bottom die 12 plane of a die 11, is made of a curved surface almost circular arc shape in its cross section, and the flange collar part 3 before performing a finish mold is put in the bottom die concave part. The collar part 3 is then pressurized with the upper die so that the right angular shape peripheral bottom edge part 3a in cross section of the collar part 3 is finish-molded in almost circular arc shape in its cross section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange for a container such as a drum and a method for producing the flange.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, for example, a press-fit type flange (41) of a drum can is generally made of steel, and a female screw portion is provided on an inner peripheral surface of the cylindrical portion. The lower edge is provided with an octagonal flange portion (43) as viewed from a plane, but the outer peripheral lower edge portion (43a) of the flange portion (43) is formed in a right angle in cross section, and a sharp corner portion is formed. It had been.

[0003]

In a conventional drum can having such a flange (41) attached to the peripheral edge of the opening of the top plate, when the inner surface of the drum can is subjected to surface treatment such as chrome plating or unichrome plating, or When coating the inner surface of the inner drum, the outer peripheral lower edge (43a) of the flange (43) of the flange (41) is formed as a sharp corner having a right-angle cross section, so that There is a problem that the plating or paint film (48) is hardly formed and the plating or paint film (48) has a cut (49).

The outer peripheral lower edge (4) of the flange flange (43) is
In 3a), if a cut (49) occurs in such a plating or paint film (48), depending on the type of drum can contents, the content leaches from the cut (49) of the film (48). The steel flange (41) and the top plate may be corroded, or conversely, when opening and closing the plug that is screwed into the flange (41), plating or paint on the inner surface of the flange (41) mounting part When the film (48) of the film (48) is peeled off and the peeled pieces of the film (48) fall into the drum, the contents of the drum can become contaminated, which may cause a problem.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, wherein the outer peripheral lower edge of the flange portion of the flange for a container such as a canister has a curved surface having a substantially circular arc cross section, and the surface thereof is formed. Because of its smoothness, it is possible to apply a uniform plating or paint film to the lower edge of the outer periphery of the flange, so that the plating or paint film on the inner surface of the flange mounting part of the drum can does not come off when opening and closing the plug. It is possible to provide a flange for a container such as a dora can that can prevent contamination of the contents of a drum can by plating pieces and coating pieces beforehand, and to efficiently mass-produce a flange having such excellent quality.
It is an object of the present invention to provide a method for manufacturing a flange for a container such as a dora can, which can incorporate the manufacturing process of the flange into a press line, thereby increasing the productivity, and thereby saving labor and automation of manufacturing the flange.

[0006]

In order to achieve the above object, a flange for a container such as a drum can of the present invention has a polygonal shape as viewed from a plane at a lower edge of a cylindrical portion having an internal thread portion on an inner peripheral surface. A flange provided with a flange portion, wherein a lower peripheral portion of the outer periphery of the flange portion is formed into a curved surface having a substantially circular arc cross section.

Further, a method of manufacturing a flange for a container such as a drum can according to the present invention comprises: The upper die and the lower die have an inner peripheral lower edge formed into a curved surface having a substantially circular arc cross section, and a flange of the flange is fitted into the lower die recess, and this flange is formed. By being pressed by the upper mold, the outer peripheral lower edge portion of the flange portion having a right angle in cross section is finish-formed into a curved surface having a substantially circular arc cross section.

Further, the method for manufacturing a flange for a container such as a drum can according to the present invention comprises a conveyor for carrying the flange for a container such as a drum before finish molding, and a recess having the same shape in which a polygonal flange portion is housed when viewed from the plane of the flange. A mold having a lower mold having a lower mold and a pressing upper mold for pressing a flange portion, a conveyor for carrying out a flange after the finish molding, and a flange on the carry-in conveyor before the finish molding to a lower mold of the mold, and a mold. And a flange transfer device for transferring the flanges after the finish molding on the lower mold onto the carry-out conveyor, respectively, and the inner peripheral lower edge of the concave portion of the lower mold of the mold has a curved surface having a substantially circular cross section. By operating the flange transfer device, the flange before the finish molding is transferred from the carry-in conveyor to the lower die of the die, and the flange of the flange is fitted into the concave portion of the lower die,
By pressing the flange of the flange fitted into the recess with the upper die, the outer peripheral lower edge of the flange at a right angle in cross section is finished and formed into a curved surface having a substantially circular arc cross section. The method is characterized in that the flange after the finish molding is transferred from the lower mold of the mold to the carry-out conveyor by the operation of the flange transfer device.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

Referring first to FIGS. 1 to 3, a steel press-fit type flange (1) for a drum according to the present invention has a flat surface at the lower edge of a cylindrical portion (2) having an internal thread (4) on the inner peripheral surface. A flange (3) having an octagonal shape is provided, and the outer peripheral lower edge (3a) of the flange (3) is formed into a curved surface having a substantially arc-shaped cross section. The curved shape of the outer peripheral lower edge portion (3a) of the flange portion (3) is desirably substantially circular in cross section having a radius of about 0.1 to 1.0 mm. In addition, the outer peripheral upper edge portion (3b) of the flange portion (3) is also formed into a curved surface having a substantially circular arc cross section, but this has already occurred when a flange material is manufactured from a steel plate by punching. Things.

[0011] On the inner peripheral surface of the cylindrical portion (2) of the flange (1),
A downwardly inward packing contacting inclined surface (5) connected to the upper edge of the female screw portion (4) is formed, and a thin-walled cylindrical portion (6) connected to the upper edge of the inclined surface (5) is formed. A downwardly inwardly inclined surface (7) is formed inside the upper edge (6a) of the thin-walled tubular portion (6).

FIG. 2 shows the flange (1) according to the present invention.
This shows the use state of. In the same figure, an upright cylindrical portion (32) is provided on the periphery of the opening (31) of the top plate (30) of the drum can so as to protrude upward, and a portion closer to the lower end of the height of the upright cylindrical portion (32) than the flat surface An annular step (33) having an octagonal shape is provided. And the rising cylinder part (3
In (2), the flange (1) according to the present invention is press-fitted from below, and the upper edge (6a) of the thin-walled tubular portion (6) is bent outward to form the upper edge (32a) of the rising tubular portion (32). ). The outer peripheral edge of the flange (3) at the lower edge of the flange (1) has an octagon when viewed from a plane, and the octagonal detent skirt (32b) at the lower side of the step (33) also viewed from the same plane. Is associated with the inner peripheral edge of A gasket (35) is filled in a space between the flange (1) and the rising cylindrical portion (32) of the top plate (30).

[0013] For the drum can having the flange (1) of the above invention mounted on the peripheral edge of the opening of the top plate, the inner surface of the drum can is subjected to, for example, chrome plating or unichrome plating, or the inner surface of the interior drum can is painted. When the flange is applied, the outer peripheral lower edge (3a) of the flange (3) of the flange (1)
Has a substantially arcuate cross section and a smooth surface. Therefore, as shown in FIG. 3, a uniform coating (8) of plating or paint is sufficiently formed also on the outer peripheral lower edge (3a) of the flange (3), and a break is formed in the plating or paint coating (8). Does not occur. For this reason, there is no danger that the contents will leach out from the breaks in the plating or paint film and corrode the steel flange or top plate depending on the type of the contents of the drum as in the past, and conversely, the flanges When opening and closing the plug that is screwed into (1), the plating or paint film on the inner surface of the flange (1) mounting part is peeled off, and the peeled pieces of the film fall into the drum and the contents of the drum can are removed. There is no trouble such as contamination.

Referring now to FIG. 4a, the mold (11) of the cold forging press used in the method for manufacturing a drum can flange according to the present invention is a drum can flange before finish forming.
A fixed lower mold (12) having a recess (13) of the same shape in which an octagonal flange (3) is accommodated when viewed from the plane of (1a), and a movable upper mold for pressing and lowering the flange (3). 14) and fixed lower mold (12)
The inner peripheral lower edge portion (13a) of the concave portion (13) has a substantially arcuate cross-sectional curved surface.

On the other hand, the movable upper die (14) for pressing
It has a through hole (15) into which the cylindrical part (2) of (1) is fitted, and the upper part of the octagonal flange part (3) as viewed from the plane of the flange (1a) is provided on the lower surface of the upper die (14). It has a recess (16) of the same shape to be fitted.

Then, as shown in FIG.
The flange (3) of the flange (1a) is fitted into the concave portion (13) of the flange, and at this time, the outer peripheral lower edge (3a) of the flange (3) has a sharp corner having a right-angle cross section. It has been done. Next, by pressing the flange (3) of the flange (1a) from above by the operation of the movable upper die (14), as shown in FIG. 4b, the outer peripheral lower edge (3a) of the flange (3) is ) Is formed into a curved shape with a substantially circular arc cross section.

According to the method of the present invention, the press-fitting type flange (1) for a drum having excellent quality as described above can be efficiently mass-produced.

Next, referring to FIG. 5, a method for continuously producing a drum can flange according to the present invention comprises a hopper (20) for accommodating a drum can flange (1a) before finish molding and a hopper (20). The conveyor (21) for carrying the drum can flange (1a) before finish molding dropped from the lower end opening (20a) while aligning it, and the octagonal flange (3) as viewed from the plane of the flange (1a). A mold (11) for a cold forging press including a fixed lower mold (12) having a recess (13) of the same shape to be housed therein and a movable upper mold (14) capable of vertically moving and pressing the flange (3); The conveyor (22) for unloading the flange (1b) after finish molding and the flange (1) on the terminal end of the carry-in conveyor (21) before finish molding.
a) to the lower mold (12) of the mold (11), and the flange (1b) after the finish molding on the lower mold (12) of the mold (11) onto the starting end of the unloading conveyor (22). A transfer mechanism (23) is provided as a flange transfer device for transfer.

As described above, the fixed lower mold (12) of the mold (11) has a concave portion (13) whose inner peripheral lower edge (13a) has a curved surface having a substantially circular arc cross section. It has been done.

A transfer mechanism (23) as a flange transfer device includes a pair of frames (24) and (24) arranged on both left and right sides with respect to the traveling direction of the carry-in conveyor (21) and the carry-out conveyor (22). A total of four flange clamping claws (25) (25)
(26) and (26) are provided at predetermined intervals in front and rear and inwardly protruding.

Then, a drum can flange (1a) before finish molding is dropped from the lower end opening (20a) of the hopper (20) onto the start end of the carry-in conveyor (21), and the operation of the carry-in conveyor (21) is performed. Thus, the flange (1a) before the finish molding is conveyed onto the terminal end of the conveyor (21) while being aligned. Therefore, a pair of left and right frames is operated by the operation of the transfer mechanism (23).
(24) (24) is closed so that the distance between them in the left-right direction is reduced, and the pair of rear claws (25) (25) on the rear side in the traveling direction of both frames (24) (24) is used to Of the transfer mechanism (23) and the frame (24) (2) of the transfer mechanism (23).
After the flange (1a) is moved from the end of the carry-in conveyor (21) to the fixed lower mold (12) of the mold (11) by the advance of 4), the left and right frames are moved by the operation of the transfer mechanism (23). (twenty four)
(24) is opened, and the flange (1a) is placed on the fixed lower mold (12). At this time, the flange (3) of the flange (1a) is fitted into the recess (13) of the lower mold (12).

Thereafter, the left and right frames (24) and (24) are retracted by the operation of the transfer mechanism (23), and a pair of rear claws (25) on the rear side in the traveling direction of the left and right frames (24) and (24).
(25) returns to both sides of the flange (1a) before the next finish forming on the end of the carry-in conveyor (21), and a pair of front claws on the front side in the traveling direction of the left and right frames (24) and (24). (26) The (26) is positioned so as to look into the left and right sides of the fixed lower mold (12) of the mold (11).

Next, as described above, the concave portion (13) of the lower mold (12)
The flange (3) of the flange (1a) fitted into the inside is pressed from above by the movable upper die (14), so that the outer peripheral lower edge (3a) of the flange (3) having a rectangular cross section is formed. Is formed into a curved surface having a substantially circular arc cross section. Then, when the left and right frames (24) and (24) are closed again by the operation of the transfer mechanism (23) so that the space between them in the left and right direction is reduced, the both frames (2
4) A pair of front claws (26) and (26) of (24) sandwich the cylindrical part (2) of the finished flange (1b), and then the frame (24) of the transfer mechanism (23). (24) moves the flange (1b) after finish molding from the lower mold (12) of the mold (11) onto the start end of the unloading conveyor (22), and then operates the transfer mechanism (23). The left and right frames (24) and (24) are opened, and the flange (1b) after the finish molding is fixed to the mold (11).
It is transferred from (12) onto the starting end of the discharge conveyor (22).

When the pair of left and right frames (24) and (24) are closed by the operation of the transfer mechanism (23), a pair of rear claws (25) on the rear side in the traveling direction of both frames (24) and (24). (25) clamps the cylindrical part (2) of the flange (1a) before the final forming on the end of the carry-in conveyor (21), and the flange (1)
The supply of the mold (11) to the fixed lower mold (12) in (a) is performed synchronously.

According to the method of the present invention, the flange (1) having excellent quality as described above can be efficiently mass-produced, and the manufacturing process of the flange (1) can be incorporated into the press line. As a result, the productivity can be increased, and the production of the flange (1) can be labor-saving and automated.

In the above-described embodiment, a transfer mechanism is used as the flange transfer device, and the flange (1a) before the finish molding is supplied to the fixed lower mold (12) of the mold (11) and finished. Although the discharge of the flange (1b) after the molding is performed in synchronization with the discharge of the flange (1b), the discharge may be performed using a flange transfer robot or the like.

The method of the present invention is applicable not only to a method for producing a flange used for a similar container such as a gallon can but also to a drum can.
The same applies.

[0028]

As described above, the flange for a container such as a drum can according to the present invention is provided with a flange having a polygonal shape as viewed from a plane at the lower edge of a cylindrical portion having a female thread on the inner peripheral surface. Since the outer peripheral lower edge of the flange is formed in a curved surface having a substantially circular arc cross section, the outer peripheral lower edge of the flange of the flange is formed in a substantially circular arc cross section. Since the surface is smooth, the outer peripheral lower edge of the flange can be evenly plated or coated with paint, and when opening and closing the plug, plating and paint on the inner surface of the flange mounting portion of the drum can Thus, there is an effect that contamination of the contents of the drum can by plating pieces or coating film pieces can be prevented without peeling off the film.

Further, as described above, the method for manufacturing a flange for a container such as a drum can according to the present invention comprises a lower mold having a same-shaped concave portion in which a polygonal flange portion is housed when viewed from the plane of the flange before the finish molding; The upper mold has a pressing upper mold that presses the lower part, the inner peripheral lower edge of the concave part of the lower mold is a curved surface having a substantially circular cross section, and the flange of the flange is housed in the concave part of the lower mold, By pressing the flange with the upper die, the outer peripheral lower edge of the flange in the shape of a right angle in cross section is finish-formed into a curved surface having a substantially circular cross section. According to the method of the present invention, As a result, it is possible to efficiently produce a flange having excellent quality as described above.

Further, according to the method for manufacturing a flange for a container such as a drum according to the present invention, as described above, the conveyor for carrying the flange for the container such as the drum before the finish molding and the flange which is polygonal as viewed from the plane of the flange are housed. A mold having a lower mold having a concave portion of the same shape and an upper mold for pressing the flange portion, a conveyor for carrying out the flange after the finish molding, and a lower mold for the flange on the carry-in conveyor before the finish molding. And a flange transfer device for transferring each of the finish-molded flanges on the lower mold of the mold onto the carry-out conveyor, wherein the lower edge of the inner periphery of the concave portion of the lower mold of the mold has a substantially circular arc in cross section. It is made into a curved shape, and the flange before finish molding is transferred from the carry-in conveyor to the lower mold of the mold by the operation of the flange transfer device, and the flange of the flange is fitted into the recess of the lower mold, This By pressing the flange portion of the flange fitted into the recess with the upper die, the outer peripheral lower edge portion of the flange portion having a right angle in cross section is finish-molded into a curved surface having a substantially circular arc cross section. According to the method of the present invention, the flange having the excellent quality is efficiently mass-produced according to the method of the present invention, by operating the transfer device to transfer the flange after the finish molding from the lower mold of the mold onto the carry-out conveyor. In addition to this, the production process of the flange can be incorporated into the press line, so that the productivity is increased, and the effect of saving labor and automating the production of the flange can be achieved.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a drum can flange according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a flange attachment portion showing a use state in which the flange of FIG. 1 is attached to an opening of a top plate of a drum can.

FIG. 3 is an enlarged sectional view of a main part of the flange flange.

4A and 4B are partial enlarged cross-sectional views of a mold for carrying out the method for manufacturing a drum can flange of the present invention. FIG. 4A shows a state before the flange is finish-formed, and FIG. The state is shown.

FIG. 5 is a schematic plan view of an apparatus for continuously performing a method for manufacturing a drum can flange of the present invention.

FIG. 6 is an enlarged sectional view of a main part of a conventional flange flange, corresponding to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press-fitting flange for drum cans 1a Flange before finish molding 1b Flange after finish molding 2 Cylindrical part 3 Octagonal flange part 3a when viewed from a plane 3a Outer peripheral lower edge part 4 Female screw part 11 Mold 12 Lower mold 13 Eight when viewed from a plane Rectangular recess 13a Inner peripheral lower edge portion 14 Upper die for pressing 21 Carry-in conveyor 22 Carry-out conveyor 23 Flange transfer device

Claims (3)

[Claims] 1. A cylindrical portion having an internal thread (4) on an inner peripheral surface.
(2) A flange for a container such as a drum having a flange (3) having a polygonal shape as viewed from a plane at a lower edge thereof, wherein the flange is
(3) A flange for a container such as a drum can, characterized in that the outer peripheral lower edge (3a) of (3) is formed in a curved surface having a substantially circular arc cross section. 2. A lower mold (12) having a concave portion (13) of the same shape in which a polygonal flange portion (3) is accommodated when viewed from the plane of a flange for a container such as a drum can (1a) before finish molding, and a flange portion (1). 3) is provided with a pressing upper die (14) for holding the lower die (12), and the inner peripheral lower edge (13a) of the concave portion (13) of the lower die (12) is formed in a substantially arc-shaped curved cross section. The flange (3) of the flange (1a) is fitted into the concave portion (13) of the mold (12), and the flange (3) is pressed by the upper mold (14) to thereby form the flange (3). Characterized in that the outer peripheral lower edge (3a) having a right angle in cross section is finish-molded into a curved surface having a substantially arc shape in cross section,
A method for manufacturing flanges for containers such as drums. 3. A conveyer (21) for carrying in a flange (1a) for a container such as a drum can before finish molding, and a recess (13) of the same shape in which a polygonal flange (3) is housed when viewed from the plane of the flange (1a). )
Pressing upper die (1)
Mold (11) equipped with 4) and flange (1b) after finish molding
Conveyor (22), and the flange (1a) on the carry-in conveyor (21) before finish molding is attached to the lower mold (12) of the mold (11), and the lower mold (12) of the mold (11). A flange transfer device (23) for transferring the upper finish-molded flange (1b) onto the carry-out conveyor (22), respectively, in the recess (13) of the lower mold (12) of the mold (11). The lower peripheral edge (13a) has a curved surface with a substantially circular arc cross section, and the flange transfer device (23) activates the flange (1a) before finish molding from the loading conveyor (21) onto the die. (11) Transfer to the lower mold (12) and replace the flange (3) of the flange (1a) with the lower mold.
The flange (3) of the flange (1a) fitted in the concave portion (13) is pressed by the upper mold (14), so that the flange ( 3) finish forming the outer peripheral lower edge (3a) of right angle in cross section into a curved surface with a substantially circular arc cross section, and then operate the flange transfer device (23) to remove the finished formed flange (1b). Conveyor unloading from lower mold (12) of mold (11)
(22) A method for producing a flange for a container such as a drum can, characterized in that the flange is transferred to the top.